CN102810974B - Detection pulse generator, control chip and switching power source - Google Patents
Detection pulse generator, control chip and switching power source Download PDFInfo
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Abstract
An embodiment of the invention discloses a detection pulse generator, a control chip and a switching power source. A circuit comprises a switching signal period detection module and a detection pulse generation module. Signals embodying current switching signals act at an input end of the switching signal period detection module, an output end of the switching signal period detection module is connected with an input end of the detection pulse generation module, the switching signal period detection module generates equivalent switching period signals as same as the current switching signals in period according to the embodied current switching signal period, and the detection pulse generation module generates detection pulse with the period in positive correlation to the period of the equivalent switching period signals according to the equivalent switching period signals when the equivalent switching period signals are detected. In the embodiment, system efficiency of the switching power source can be improved.
Description
Technical field
The present invention relates to switch power technology field, in particular, relate to a kind of detection pulse generator, control chip and Switching Power Supply.
Background technology
The advantages such as Switching Power Supply is high with its efficiency, volume is little, quality is light develop into a kind of stabilized voltage power supply of main flow gradually, and its control model can be divided into PID to control and Bang-Bang controls.
Refer to Fig. 1, for the circuit diagram of the Switching Power Supply that Bang-Bang of the prior art controls, the Switching Power Supply that Bang-Bang controls comprises control chip 101, diode D0, diode D1, diode D2, outputting inductance L0, resistance R0, resistance R1, resistance R2, electric capacity Cout, electric capacity Cin and electric capacity C1, wherein, control chip 101 comprises driver 1011, switching tube Q1, detects pulse generator 1012 and Bang-Bang controller 1013, and control chip 101 has CS pin, GNDIC pin, Vin pin, FB pin and Vcc pin.Annexation as shown in FIG..When detecting pulse generator 1012 and producing detection pulse, driver 1011 driving switch pipe Q1 conducting, now outputting inductance L0 energy storage, when the trailing edge detecting pulse arrives, outputting inductance L0 releases energy, now Bang-Bang controller 1013 can by the output voltage of FB pin sense switch power supply, when Bang-Bang controller 1013 detects that output voltage is less than pre-determined lower limit voltage, Bang-Bang controller 1013 produces switching signal, switching signal makes driver 1011 driving switch pipe Q1 conducting, now outputting inductance L0 energy storage.High level lasting time due to switching signal is far longer than and detects duration of pulse high level, thus control chip 101 mainly through switching signal for load provides energy, by detecting pulse detection output voltage.
Due to may to be underloading also may the be heavy duty of the output loading of Switching Power Supply, and heavy duty is different to the frequency requirement detecting pulse with underloading, if consider the situation of heavy duty, adopt the detection pulse that frequency is high, when the load of Switching Power Supply is underloading, there will be the situation exporting and just can export a switching signal after multiple detection pulse, the energy now in outputting inductance L0 mainly by detecting pulses generation, causes the system effectiveness of Switching Power Supply lower.If consider the situation of underloading, adopt the detection pulse that frequency is low, when the load of Switching Power Supply be heavily loaded, there will be can not the situation of the output voltage of sense switch power supply in time, causes output voltage undershoot excessive.
From the foregoing, the load that fixing detection pulse can not take into account Switching Power Supply is underloading and heavily loaded situation.
Summary of the invention
In view of this, the invention provides and a kind of detect pulse generator, control chip and Switching Power Supply, to overcome in prior art the problem detecting the situation that load that pulse can not take into account Switching Power Supply is underloading and heavy duty.
For achieving the above object, the invention provides following technical scheme:
A kind of detection pulse generator, is applied to the Switching Power Supply that Bang-Bang controls, comprises: switching signal cycle detection module and detection pulse generate module;
Embody the signal function of current switch signal period in an input of described switching signal cycle detection module, the output of described switching signal cycle detection module is connected with an input of described detection pulse generate module;
Described switching signal cycle detection module generates and the synperiodic equivalent switch periodic signal of described current switch signal according to the signal of described embodiment current switch signal period, and described detection pulse generate module inspection becomes the detection pulse of positive correlation with the cycle of described equivalent switch periodic signal according to described equivalent switch periodic signal generating period.
Wherein, the energy transform device primary energy end of transmission of described detection pulse in described Switching Power Supply with on once produce during Energy Transfer.
Wherein, described energy transform device is outputting inductance, and Energy Transfer is the charge and discharge process of described outputting inductance.
Wherein, the width of described detection pulse high level is predetermined width.
Wherein, control signal acts on another input of described switching signal cycle detection module, and described switching signal cycle detection module is also for before first switching signal produces, and control signal control switch signal period detection module exports high level;
Accordingly, when described detection pulse generate module is also for detecting that described switching signal cycle detection module exports high level always, generate the detection pulse of predetermined period.
Wherein, described detection pulse generate module specifically comprises:
Oscillator, counter, encoder, first and door, d type flip flop, MUX, second and door and trigger element;
The output of described oscillator is connected with the input end of clock of described counter, the output of described counter is connected one to one with the input of described MUX respectively, the output of described counter is connected one to one with the input of described encoder respectively, asserts signal acts on the set end S and described first of described counter and an input of door respectively, reset signal acts on the reset terminal R of described counter, the output of described encoder is connected one to one with the input of described d type flip flop respectively, the input end of clock of described d type flip flop is connected with the output of door with described first, the output of described d type flip flop is connected one to one with the data selection end of described MUX respectively, described first is connected with the output of described switching signal cycle detection module with another input of door, the output of described MUX is connected with an input of door with described second, described second is connected with the output of described switching signal cycle detection module with another input of door, described second is connected with the input of described trigger element with the output of door, the output of described trigger element is the output of described pulse generating module,
Before first switching signal produces, described switching signal cycle detection module exports high level always, described asserts signal is low level and carries out initialization to described counter to obtain primary data, after to described counter initialization, described asserts signal is converted to high level, the level of described asserts signal by low transition to high level time, described MUX is initialised, after the first switching signal produces, described equivalent switch periodic signal acts on the input of described first and door, the signal of the time width of the width that described reset signal is high level needed for described counter resets, the time difference of the rising edge of described reset signal and the rising edge of described equivalent switch periodic signal is that the data of input are passed to the time of output by described d type flip flop, described trigger element generates the signal exported with described MUX and has the same cycle and the width of high level is the detection pulse of predetermined width.
Wherein, described encoder also comprises preset upper limit numerical value and pre-determined lower limit numerical value;
Described encoder is also for judging the output numerical value of described counter, when the output numerical value of described counter is greater than described preset upper limit numerical value, described preset upper limit numerical value is encoded, and data after output encoder, when the output numerical value of described counter is less than described pre-determined lower limit numerical value, described pre-determined lower limit numerical value is encoded, and the data after output encoder.
Wherein, shielded signal acts on another input of described detection pulse generate module, the energy transform device primary energy end of transmission in the Switching Power Supply that described shielded signal controls at Bang-Bang with on be once high level during Energy Transfer, be low level in the energy transport of described energy transform device.
Wherein, described detection pulse generate module specifically comprises:
Oscillator, counter, encoder, first and door, d type flip flop, MUX, second and door and trigger element;
The output of described oscillator is connected with the input end of clock of described counter, the output of described counter is connected one to one with the input of described MUX respectively, the output of described counter is connected one to one with the input of described encoder respectively, asserts signal acts on the set end S and described first of described counter and an input of door respectively, reset signal acts on the reset terminal R of described counter, the output of described encoder is connected one to one with the input of described d type flip flop respectively, the input end of clock of described d type flip flop is connected with the output of door with described first, the output of described d type flip flop is connected one to one with the data selection end of described MUX respectively, described first is connected with the output of described switching signal cycle detection module with another input of door, the output of described MUX is connected with an input of door with described second, described shielded signal acts on another input of described second and door, described second is connected with the input of described trigger element with the output of door, the output of described trigger element is the output of described pulse generating module,
Before first switching signal produces, described switching signal cycle detection module exports high level always, described asserts signal is low level and carries out initialization to described counter to obtain primary data, after to described counter initialization, described asserts signal is converted to high level, the level of described asserts signal by low transition to high level time, described MUX is initialised, after the first switching signal produces, described equivalent switch periodic signal acts on the input of described first and door, the signal of the time width of the width that described reset signal is high level needed for described counter resets, the time difference of the rising edge of described reset signal and the rising edge of described equivalent switch periodic signal is that the data of input are passed to the time of output by described d type flip flop, described trigger element generates the signal exported with described MUX and has the same cycle and the width of high level is the detection pulse of predetermined width.
A kind of control chip, is applied to the Switching Power Supply that Bang-Bang controls, comprises described in above-mentioned any one and detect pulse generator.
Wherein, the signal of described embodiment current switch signal period is the signal on control chip FB pin, the signal on control chip CS pin and one or more in current switch signal.
Wherein, the signal of described embodiment switch power source output voltage is signal on the FB pin of control chip and current switch signal;
When described switching signal cycle detection module detects that the rising edge of described current switch signal arrives, arrive the time for benchmark with the rising edge of described current switch signal, when detecting that first trailing edge of the signal on described FB pin arrives, generate the trailing edge of described equivalent switch periodic signal, when detecting that second trailing edge of the signal on described FB pin arrives, generate the rising edge of described equivalent switch periodic signal.
The Switching Power Supply that Bang-Bang controls, comprises the control chip detecting pulse generator described in above-mentioned any one or comprise described in above-mentioned any one.
A kind of detection pulse generation method, be applied to the Switching Power Supply that Bang-Bang controls, the method comprises:
Signal according to embodying the current switch signal period generates and the synperiodic equivalent switch periodic signal of described current switch signal;
Become the detection pulse of positive correlation with the cycle of described equivalent switch periodic signal according to described equivalent switch periodic signal generating period.
Wherein, the energy transform device primary energy end of transmission of described detection pulse in described Switching Power Supply with on once produce during Energy Transfer.
Wherein, described energy transform device is outputting inductance, and Energy Transfer is the charge and discharge process of described outputting inductance
Wherein, the high level width of described detection pulse is predetermined width.
Known via above-mentioned technical scheme, adopt the embodiment of the present invention, first detect the cycle of current switch signal by switching signal cycle detection module and generate equivalent switch periodic signal, detect pulse generate module becomes positive correlation with the cycle of equivalent switch periodic signal detection pulse according to equivalent switch periodic signal generating period, because the cycle of equivalent switch periodic signal is identical with the cycle of current switch signal, so detect the cycle of pulse also become positive correlation with the cycle (cycle of current switch signal at this moment refers to produce and detects the postimpulse previous switching signal cycle) of current switch signal, because the output voltage only in Switching Power Supply just produces switching signal lower than during pre-determined lower limit magnitude of voltage, so the cycle of switching signal can reflect the situation of Switching Power Supply present load, when the load of Switching Power Supply is underloading, the cycle of switching signal is large, when the load of power supply is heavy duty, the cycle of switching signal is little, accordingly, when the load of Switching Power Supply is underloading, the cycle detecting pulse is large, when the load of power supply is heavy duty, the cycle detecting pulse is little, thus detect underloading and the case of heavy load that cycle of pulse has taken into account Switching Power Supply, energy in Switching Power Supply outputting inductance L0 produces primarily of switching signal, so system effectiveness when improve Switching Power Supply underloading, decrease output voltage undershoot during Switching Power Supply heavy duty.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the circuit diagram of the Switching Power Supply that Bang-Bang of the prior art controls;
Fig. 2 is the structural representation of the embodiment of the present invention the first detection pulse generator disclosed;
Fig. 3 is the oscillogram of switching signal cycle detection module 201;
A kind of circuit diagram detecting pulse generate module that Fig. 4 provides for the embodiment of the present invention;
Fig. 5 is the oscillogram detecting pulse generate module;
A kind of flow chart detecting pulse generation method that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As can be seen from Figure 1 the Switching Power Supply that Bang-Bang of the prior art controls comprises: control chip 101, diode D0, diode D1, diode D2, outputting inductance L0, resistance R0, resistance R1, resistance R2, electric capacity Cout, electric capacity Cin and electric capacity C1, wherein, control chip 101 comprises driver 1011, switching tube Q1, detects pulse generator 1012 and Bang-Bang controller 1013, and control chip 101 has CS pin, GNDIC pin, Vin pin, FB pin and Vcc pin.The Vin pin of control chip 101 is connected with external power supply Vin respectively and one end of electric capacity Cin is connected, the other end of electric capacity Cin respectively with the positive pole of diode D0, one end and the ground of electric capacity Cout are connected, and the other end of electric capacity Cin is the output negative terminal of Switching Power Supply, the negative pole of diode D0 respectively with the GNDIC pin of control chip 101, one end of resistance R0, one end of resistance R2 and one end of electric capacity C1 are connected, the GNDIC pin controlling core 101 is the reference zero potential of control chip, the other end of resistance R0 is connected with one end of outputting inductance L0 and the CS pin of control chip 101 respectively, the other end of resistance R2 is connected with one end of resistance R1 and the FB pin of control chip 101 respectively, the other end of outputting inductance L0 is connected with the other end of electric capacity Cout, and the other end of outputting inductance L0 is the output plus terminal of Switching Power Supply, the other end of resistance R1 is connected with the positive pole of diode D2 and the negative pole of diode D1 respectively, the positive pole of diode D1 and electric capacity Cout the other end be connected, and the output cathode of the just very Switching Power Supply of diode D1, the negative pole of diode D2 is connected with the Vcc pin of control chip and the other end of electric capacity C1 respectively, the input of Bang-Bang controller 1013 is FB pin, the output of Bang-Bang controller 1013 and the output of detection pulse generator 1012 are all connected with the input of driver 1011, the output of driver 1011 is connected with the control end of switching tube Q1, the current collection very Vin pin of switching tube Q1, launch very GNDIC pin.
The end and outputting inductance L0 discharges is disconnected at switching tube Q1, when being in stable state, outputting inductance L0 short circuit, output voltage is connected with the GNDIC pin of control chip 101 by resistance R0, now the voltage seen of control chip 101FB pin almost nil (actual for FB pin and GNDIC pin voltage poor, namely be control chip with GNDIC with reference to ground), the voltage of FB pin can not the output voltage of reactive switches power supply; After detection pulse generator 1012 produces detection pulse, detect pulse and driver 1011 driving switch pipe Q1 is opened, now, external power supply Vin is directly loaded on one end of resistance R0 by switching tube Q1, now outputting inductance L0 energy storage; When the trailing edge detecting pulse arrives, switching tube Q1 disconnects, and outputting inductance L0 starts to release energy, and electric current flows to negative pole by the positive pole of diode D0, control chip is with reference to ground GNDIC pin voltage a little less than systematically, and the voltage now on pin FB can reflect the magnitude of voltage of output voltage.When output voltage is lower than pre-determined lower limit, Bang-Bang controller produces Bang signal, Bang signal makes driver 1011 driving switch pipe Q1 open, now outputting inductance L0 energy storage, output voltage raises, because the conduction duration of Bang signal is longer than detecting pulse, so it is that the energy that outputting inductance L0 brings is many that the energy Ratios that Bang signal is outputting inductance L0 to be brought detects pulse, when the trailing edge of Bang signal arrives, switching tube Q1 disconnects, outputting inductance L0 starts to release energy, electric current flows to negative pole by the positive pole of diode D0, control chip with reference to ground GNDIC pin voltage a little less than systematically, now the voltage of FB pin also can reflect output voltage, so Bang signal itself also can as playing the effect detecting output voltage.
The not necessarily outputting inductance L0 of energy storage in the Switching Power Supply that Bang-Bang controls, also can be energy transform device, wherein, energy transform device comprises outputting inductance L0, just just conveniently draw a concrete outputting inductance L0 to draw.
The signal embodying the cycle of switching signal as can be known from Fig. 1 can be the signal on the FB pin of control chip, signal on control chip CS pin and one or more in switching signal.
When the output of Switching Power Supply is connected to heavy duty, heavy duty consumed energy is more, the output voltage of Switching Power Supply declines fast, so the detection pulse frequency needed is high, when the output of Switching Power Supply is connected to underloading, underloading consumed energy is less, the output voltage of Switching Power Supply declines slow, so the detection pulse frequency needed is low, because the frequency of detection pulse of the prior art is fixing, and the situation of the load of Switching Power Supply can change at any time, if in order to the situation that the load taking into account Switching Power Supply is heavy duty, adopt the detection pulse that frequency is high, a switching signal just can be exported after probably exporting multiple detection pulse when so load is underloading, energy now in outputting inductance L0 is mainly by detecting pulses generation, suppose that the voltage of output may only need a switching signal just can be increased to pre-determined lower limit magnitude of voltage, but it is higher owing to detecting pulse frequency, the output voltage of Switching Power Supply can by maintaining the magnitude of voltage of a little higher than pre-determined lower limit voltage in multiple detection pulse long period, so the system effectiveness of Switching Power Supply is lower, if in order to the load taking into account Switching Power Supply is the situation of underloading, adopt the detection pulse that frequency is little, when load becomes heavy duty, just can not the output voltage of sense switch power supply in time, under critical condition, in the single detection pulse period, the output voltage of Switching Power Supply may decline a lot than pre-determined lower limit magnitude of voltage, thus cause the output voltage undershoot of Switching Power Supply excessive.
Embodiment one
Refer to accompanying drawing 2, disclosed in the embodiment of the present invention, the first detects the structural representation of pulse generator, the Switching Power Supply that this circuit application controls in Bang-Bang, this circuit can comprise: switching signal cycle detection module 201 and detection pulse generate module 202, wherein:
Embody the signal function in the cycle of current switch signal in an input of switching signal cycle detection module 201, the output of switching signal cycle detection module 201 is connected with the input detecting pulse generate module 102.
Operation principle is as follows:
Switching signal cycle detection module 201 generates and the synperiodic equivalent switch periodic signal of current switch signal according to the signal in the cycle of embodying current switch signal, when detection pulse generate module 202 detects equivalent switch periodic signal, become the detection pulse of positive correlation with the cycle of equivalent switch periodic signal according to equivalent switch periodic signal generating period.
Above-mentioned positive correlation refers to that the cycle of switching signal is long, then the cycle detecting pulse is long; The cycle of switching signal is short, then the cycle detecting pulse is short.Herein, detecting the cycle of pulse becomes positive correlation with the cycle of the switching signal of input, should not be construed as in direct ratio, i.e. cycle of same detection pulse can cycle of the different switching signal of correspondence.
Wherein, preferably, detect the energy transform device primary energy end of transmission of pulse in described Switching Power Supply with on once produce during Energy Transfer, it should be noted that, energy transform device described in the present embodiment can be outputting inductance, and now Energy Transfer is the charge and discharge process of described outputting inductance.Such as detect pulse only to produce in outputting inductance L0 stable state, namely do not produce when outputting inductance L0 charging and discharging.
The embodiment of the present invention, first detect the cycle of current switch signal by switching signal cycle detection module 201 and generate equivalent switch periodic signal, detect pulse generate module 202 and generate the detection pulse becoming positive correlation with the cycle of equivalent switch periodic signal according to equivalent switch periodic signal, because the cycle of equivalent switch periodic signal is identical with the cycle of current switch signal, so the cycle detecting pulse also becomes positive correlation with the cycle of current switch signal, because the output voltage only in Switching Power Supply just produces switching signal lower than during pre-determined lower limit magnitude of voltage, so the cycle of switching signal can reflect the situation of Switching Power Supply present load, when the load of Switching Power Supply is underloading, the cycle of switching signal is large, when the load of power supply is heavy duty, the cycle of switching signal is little, accordingly, when the load of Switching Power Supply is underloading, the cycle detecting pulse is large, when the load of power supply is heavy duty, the cycle detecting pulse is little, thus detect underloading and the case of heavy load that cycle of pulse has taken into account Switching Power Supply, energy in energy transform device (can be outputting inductance L0) in Switching Power Supply produces primarily of switching signal, so system effectiveness when improve Switching Power Supply underloading, decrease output voltage undershoot during Switching Power Supply heavy duty.
Embodiment two
When initial, first Switching Power Supply produces a detection pulse, when detecting the output voltage of Switching Power Supply lower than pre-determined lower limit voltage, just produce a switching signal, pulse is detected so first produce, produce switching signal again, above-described embodiment only illustrates the detection pulse production process after generation first switching signal, and the undeclared production process detecting pulse before generation first switching signal, certainly the production process detecting pulse before generation first switching signal can be identical with the process producing pulse in prior art, owing to being prior art, so just do not repeating one by one here.The production process detecting pulse before generation first switching signal can also be as described below.
The embodiment of the invention also discloses the structural representation that the second detects pulse generator, the Switching Power Supply that this circuit application controls in Bang-Bang, this circuit can comprise: switching signal cycle detection module 201 and detection pulse generate module 202, wherein:
Current switch signal function is in an input of switching signal cycle detection module 201, control signal acts on another input of switching signal cycle detection module 201, and the output of switching signal cycle detection module 201 is connected with the input detecting pulse generate module 202.
Refer to Fig. 3, for the oscillogram of switching signal cycle detection module 201, FB represents the signal on the FB pin of control chip, and CS represents the signal on the CS pin of control chip, Bang represents the switching signal that Bang_Bang controller produces, and Equ represents equivalent switch periodic signal.
The signal embodying the cycle of current switch signal can be signal on the FB pin of control chip and switching signal, and the input end signal namely acting on switching signal cycle detection module has signal on the FB pin of control chip and switching signal.The signal embodying switch power source output voltage is as we know from the figure the signal on the FB pin of control chip, when switching signal cycle detection module 201 detects that the rising edge of current switch signal arrives, arrive the time for benchmark with the rising edge of current switch signal, when detecting that first trailing edge of the signal on FB pin arrives, generate the trailing edge of equivalent switch periodic signal, when detecting that second trailing edge of the signal on FB pin arrives, generate the rising edge of equivalent switch periodic signal.
As can be seen from Figure 3, the cycle of the signal on FB pin is made up of three parts: switching tube Q1 ON time (the energy transform device Energy Transfer time, such as L0 starts the charging interval) Tonp, this Energy Transfer time of outputting inductance L0 energy transform device Energy Transfer time Tons(is different from the last Energy Transfer time, for outputting inductance L0, this Energy Transfer time is outputting inductance L0 discharge time) and the energy transform device primary energy end of transmission and Energy Transfer period Toff next time.Therefore switching signal cycle detection module is when calculating the cycle of current switch signal, can from Tonp timing to next Tonp(if switching signal Bang rising edge is to next switching signal Bang rising edge), also can from Toff timing to next Toff(if Equ signal rising edge is to next Equ signal rising edge, Equ is logical signal, when being in Toff stage that switching signal Bang triggers, Equ=1, detect pulse-triggered switching tube Q1 conducting, turn off it without impact), as long as time zero a complete cycle can be formed to terminal from where timing.
Certainly the signal only had on the FB pin of control chip of the input of switching signal cycle detection module is acted on, now equivalent switch periodic signal can for being high level at Tonp, be low level signal in other moment, equivalent switch periodic signal can also for being high level at Tons, at other moment low level signal.
The signal embodying the cycle of current switch signal can also be signal on the CS pin of control chip and switching signal, and the input end signal namely acting on switching signal cycle detection module has signal on the CS pin of control chip and switching signal.When switching signal cycle detection module 101 can also detect that the rising edge of current switch signal arrives, arrive the time for benchmark with the rising edge of current switch signal, when detecting that the first time of the signal on CS pin drops to low level by zero level, generate the trailing edge of equivalent switch periodic signal, when detecting that the first time of the signal on CS pin rises to zero level by low level, generate the rising edge of the first detection signal equivalent switch periodic signal.
The signal embodying the cycle of current switch signal can also be switching signal, and now equivalent switch periodic signal is switching signal itself.
The signal embodying the current switch signal period by other produces the similar process of equivalent switch periodic signal, just repeats no longer one by one at this.
Operation principle is as follows:
Before first switching signal produces, control signal control switch signal period detection module 201 exports high level always; After first switching signal produces, switching signal cycle detection module 201 produces and the synperiodic equivalent switch periodic signal of current switch signal according to the signal embodying the current switch signal period, when detection pulse generate module 202 detects that switching signal cycle detection module 201 exports high level always, generate the detection pulse of predetermined period, when equivalent switch periodic signal being detected, generate the detection pulse becoming positive correlation with the cycle of equivalent switch periodic signal according to equivalent switch periodic signal.In any case, detect pulse and should not hinder normal switching signal, and the predetermined period detecting pulse should meet following condition: under any loading condition, initial examination and measurement pulse all can not maintain output voltage constant or rise, namely output voltage all will decline gradually, until trigger switch signal.
Preferably, predetermined period is situation according to Switching Power Supply load and fixed, if Switching Power Supply load is underloading, so predetermined period is long, if Switching Power Supply load is heavy duty, so predetermined period is short.
The embodiment of the present invention also has the beneficial effect in embodiment one.
Embodiment three
In actual applications, the implementation method of the modules in embodiment two has a variety of, is described in detail below to modules.
Referring to Fig. 4, is a kind of circuit diagram detecting pulse generate module that the embodiment of the present invention provides, and detecting pulse generate module can comprise:
Oscillator 401, counter 402, encoder 403, first and door 404, d type flip flop 405, MUX 406, second and door 407 and trigger element 408;
The output of oscillator 401 is connected with the input end of clock Clk of counter 402, the output of counter 402 is connected one to one with the input of MUX 406 respectively, the output of counter 402 is connected one to one with the input of encoder 403 respectively, asserts signal acts on the set end S and first of counter 402 and an input of door 404 respectively, reset signal acts on the reset terminal R of counter 402, the output of encoder 403 is connected one to one with the input of d type flip flop 405 respectively, the input end of clock of d type flip flop 405 is connected with the output of door 404 with first, the output of d type flip flop 405 is connected one to one with the data selection end of MUX 406 respectively, first is connected with the output of switching signal cycle detection module 101 with another input of door 404, the output of MUX 406 is connected with an input of door 407 with second, second is connected with the output of switching signal cycle detection module 101 with another input of door 407, second is connected with the input of trigger element 408 with the output of door 407, the output of trigger element 408 is the output of pulse generating module 102.
When equivalent switch periodic signal is low level in energy transform device energy transport, the energy transform device primary energy end of transmission with on be once high level during Energy Transfer, so second can the output of switching signal cycle detection module 101 be connected with another input of door 407; When equivalent switch periodic signal exists high level (such as switching signal) in energy transform device energy transport, so second cannot be connected with the output of switching signal cycle detection module 101 with another input of door 407, at this moment, a shielded signal can be produced, this shielded signal is low level in energy transform device energy transport, the energy transform device primary energy end of transmission with on be once high level during Energy Transfer, now this shielded signal is acted on another input of second and door 407; Certain be low level at equivalent switch periodic signal in energy transform device energy transport, the energy transform device primary energy end of transmission with on be once high level during Energy Transfer time, second also can not be connected with the output of switching signal cycle detection module 101 with another input of door 407, shielded signal can be acted on another input of second and door 407.
In order to be drawn into conveniently, only depicting second in figure can the output of switching signal cycle detection module 101 situation about being connected with another input of door 407, what only depict counter 402 in figure has two outputs, encoder 403 has two inputs output, MUX 406 has two inputs and a data selecting side, d type flip flop only has the situation of an input output, certain counter 402 can have 4 outputs, corresponding encoder 403 has 4 inputs and two outputs, MUX 406 has 4 inputs and two data selecting sides, counter 402 can have multiple output, corresponding encoder 403 input, the input of output and MUX 406 and the number of data selection end all need to change accordingly, this is no longer going to repeat them.
Operation principle is as follows:
Before first switching signal produces, switching signal cycle detection module exports high level always, asserts signal is initially low level, and the set end Low level effective of counter 402, asserts signal is carried out set to counter 402 and is obtained primary data, encoder 403 pairs of primary datas are encoded and are obtained the primary data after encoding, after asserts signal is to counter 402 initialization, asserts signal becomes high level, when asserts signal by low transition to high level time, the oscillator signal that counter 402 starts oscillator exports counts, before producing in the first switching signal, switching signal cycle detection module exports high level always, so asserts signal by low transition to high level time, the input end of clock of d type flip flop 405 rises to high level from low level, so the primary data after d type flip flop 405 output encoder, MUX 406 is according to the output signal in the primary data selection after coding also output counter 402, because switching signal cycle detection module exports high level always, so second has nothing to do with the output of door 407 and the output of OFF signal cycle detection module, second exports the signal that MUX 406 exports to trigger element 408 with door 407, trigger element 408 generates the signal exported with MUX 406 and has the same cycle and the width of high level is the detection pulse of predetermined width, this predetermined width is the smaller the better under the prerequisite ensureing normally switching tube Q1, be far smaller than the width of the high level of switching signal, to ensure that Switching Power Supply transmitting energy is completed by switching signal.
Preferably, trigger element 408 can trigger at the rising edge of the signal of MUX 406 output or trailing edge the detection pulse that the width generating high level is predetermined width.
Asserts signal is carried out to counter 402 primary data that set obtains and is detected pulse accordingly and should meet following condition: under any loading condition, and it is constant or rise that initial examination and measurement pulse all can not maintain output voltage, and namely output voltage all will decline gradually.
When Bang-Bang controller detects that output voltage is less than pre-determined lower limit, output switching signal, after first switching signal produces, switching signal cycle detection module 101 output equivalent switch periods signal, when rising edge due to equivalent switch periodic signal arrives, first becomes high level with the output of door 404 from low level, and d type flip flop 405 exports the signal of input to output.Equivalent switch periodic signal can also be used to as detecting the shielded signal of pulse, ensure to detect pulse do not affect switching signal (namely the energy transform device primary energy end of transmission with on once not output detections pulses during Energy Transfer).The signal exported due to equivalent switch periodic signal and MUX 406 all act on second with the input of door 407, and equivalent switch periodic signal is when being high level, current switch signal is low level, when current switch signal is high level, equivalent switch periodic signal is low level, so second only may export high level when the low level of switching signal with door 407, also only produce when the low level of switching signal (when the Equ in Fig. 5 is high level, just allowing detection trigger pulse) so detect pulse.
If under switch power supply system works in light condition, have passed through and just produce a switching signal for a long time, the numerical value of this hour counter 402 record is very large, supposing that the output voltage of Switching Power Supply is now less than pre-determined lower limit magnitude of voltage is because the load of Switching Power Supply changes heavy duty into by underloading, and the detection pulse period length now produced should be not oversize.Meanwhile, because detect pulse mainly play sense switch electric power output voltage, should as energy provider.Under any loading condition, especially under underloading condition, detect pulse should not maintain output voltage constant or rise, the detection pulse period length now produced should be too not short.Therefore preferred, can a scope be set in encoder 403, when the numerical value that counter 402 records is greater than preset upper limit numerical value, encoder 403 pairs of preset upper limit numerical value are encoded, when the numerical value that counter 402 records is less than pre-determined lower limit, encoder 403 pairs of pre-determined lower limit numerical value are encoded.The cycle of the detection pulse of such generation would not be excessive or too small.
The signal of the time width of the width that reset signal is high level needed for described counter resets, the time difference of the rising edge of reset signal and the rising edge of equivalent switch periodic signal is that the data of input are passed to the time of output by d type flip flop, the width of high level is more bigger also more passable than the counter 402 required time width that resets, the time difference of the rising edge of reset signal and the rising edge of equivalent switch periodic signal is that the data of input are passed to the time of output by d type flip flop 405, can certainly be more bigger.Preferably, reset signal can be generated by trigger element 408 and delay cell, equivalent switch periodic signal acts on the input of trigger element 408, the output of trigger element 408 is connected with the input of delay cell, this trigger element 408 triggers the spike of generation one high level for each rising edge at equivalent switch periodic signal, obtains reset signal carrying out time delay by delay cell to this high level spike; Certainly, equivalent switch periodic signal acts on the input of delay cell, the output of delay cell is connected with the input of trigger element 408, first delay cell postpone equivalent switch periods signal, trigger element 408 triggers the spike of generation one high level for each rising edge of equivalent switch periodic signal after a delay, is formed and detects pulse.
Because counter 402 just resets by reset signal after the rising edge of equivalent switch periodic signal arrives, so counter 402 records is moment that the trailing edge of reset signal is corresponding to the number of the oscillator signal of (the time t namely in Fig. 5) between moment corresponding to the rising edge of equivalent switch periodic signal, cycle of current switch signal is the cycle that the number of oscillator signal is multiplied by oscillator signal, time t is less than the cycle of a switching signal, the time due to d type flip flop 405 data of input being passed to output is very short, the time difference of cycle and the time t of switching signal is far smaller than the cycle of switching signal, so can ignore.
After first switching signal produces, now asserts signal always is high level, so first follows equivalent switch periodic signal with the output of door 404 and changes, when the rising edge of equivalent switch periodic signal arrives, this hour counter 402 have recorded the number of the oscillator signal of t time, encoder 403 exports d type flip flop input to after encoding to it, so d type flip flop 405 signal that the exports corresponding cycle of current switch signal, signal behavior one signal that MUX 406 exports according to d type flip flop 405 exports, this signal and equivalent switch periodic signal export trigger element 408 by second to door 407, due to equivalent switch periodic signal and this signal be with relation, so second only may export high level when the low level of switching signal with door 407, also only produce when the low level of switching signal so detect pulse.Trigger element 408 triggers the spike of generation one high level for each rising edge outputed signal second and door 407, and the width of this high level spike is predetermined width, thus defines detection pulse.
Wherein, before first switching signal produces, switching signal cycle detection module exports high level always, after first switching signal produces, switching signal cycle detection module output equivalent switch periods signal, this high level and equivalent switch periodic signal are the same signals that export of switching signal cycle detection module at not different conditions in the same time.
Certainly, if before first switching signal generates, produce detect the method for pulse be prior art (such as, directly with the output as MUX of certain output Q of counter or oscillator, do not need d type flip flop, because do not need the time switch cycle), so detect pulse generate module and also can there is no first and door 404, now the output of switching signal cycle detection module is directly connected with the input end of clock of d type flip flop, operation principle is identical with the operation principle of above-mentioned detection pulse generate module after first switching signal produces, just repeat no more at this.
The one provided the embodiment of the present invention above detects pulse generate module and is described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands core concept of the present invention for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
In order to allow those skilled in the art more understand the embodiment of the present invention, with concrete waveform, the embodiment of the present invention being described below, referring to Fig. 5, for detecting the oscillogram of pulse generate module.
In figure, Bang represents switching signal, Equ represents equivalent switch periodic signal, Clear represents reset signal, the output signal of Q_Tsw presentation code device, Q_Det represent the output signal of d type flip flop, Det_p represents the output signal of MUX 406, Det represents the output signal of second and door 407, and Det_Z represents that namely the output signal of trigger element 408 detects pulse.In order to be drawn into conveniently, only depict a kind of Det signal in figure, this Det signal triggers raw at the rising edge of equivalent switch periodic signal.
The embodiment of the present invention additionally provides the Switching Power Supply that a kind of Bang-Bang controls, and this Switching Power Supply comprises any one detection pulse generator above-mentioned.
Any one detection pulse generator above-mentioned can be integrated in control chip, control chip comprises CS pin and FB pin, this control chip comprises: drive circuit, Bang_Bang controller and detection pulse generator, the input of driver is connected with the detection output of pulse generator and the output of Bang_Bang controller respectively, when needs generate equivalent switch periodic signal according to switching signal, the output of Bang_Bang controller is connected with an input of the detection pulse generator in the embodiment of the present invention, when not needing to generate equivalent switch periodic signal according to switching signal, Bang_Bang controller is not connected with the detection pulse generator in the embodiment of the present invention, when needing to generate equivalent switch periodic signal according to the signal on the signal on FB pin and/or CS pin, detection pulse generator in inventive embodiments needs to be connected with FB pin and/or CS pin.
Control chip in the embodiment of the present invention can be applied in the Switching Power Supply of Bang-Bang control, so the embodiment of the present invention additionally provides in a kind of Switching Power Supply of the Bang-Bang control comprising above-mentioned control chip.
Any one detection pulse generator in the embodiment of the present invention all can be applied in the Switching Power Supply of Bang-Bang control.So the embodiment of the present invention additionally provides a kind of Switching Power Supply comprising any one Bang-Bang detecting pulse generator above-mentioned and control.
Embodiment four
Referring to Fig. 6, is a kind of flow chart detecting pulse generation method that the embodiment of the present invention provides, and the method is applied to the Switching Power Supply that Bang-Bang controls, and the method comprises:
Step S601: the signal according to embodying the current switch signal period generates and the synperiodic equivalent switch periodic signal of described current switch signal;
Step S602: the detection pulse becoming positive correlation according to described equivalent switch periodic signal generating period with the cycle of described equivalent switch periodic signal.
Preferably, the energy transform device primary energy end of transmission of described detection pulse in described Switching Power Supply with on once produce during Energy Transfer.It should be noted that, described energy transform device can be outputting inductance L0, and Energy Transfer is the charge and discharge process of described outputting inductance.Such as, produce when the outputting inductance L0 of described detection pulse in the Switching Power Supply that Bang-Bang controls is in stable state.And described detection pulse, the high level width of described detection pulse is predetermined width.This predetermined width is the smaller the better under the prerequisite ensureing normally switching tube Q1, is far smaller than the width of the high level of switching signal, to ensure that Switching Power Supply transmitting energy is completed by switching signal.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For method disclosed in embodiment, because it is corresponding with device disclosed in embodiment, so description is fairly simple, relevant part illustrates see device section.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (17)
1. a detection pulse generator, is applied to the Switching Power Supply that Bang-Bang controls, it is characterized in that, comprising: switching signal cycle detection module and detection pulse generate module;
Embody the signal function of current switch signal period in an input of described switching signal cycle detection module, the output of described switching signal cycle detection module is connected with an input of described detection pulse generate module;
Described switching signal cycle detection module generates and the synperiodic equivalent switch periodic signal of described current switch signal according to the signal of described embodiment current switch signal period, described detection pulse generate module becomes the detection pulse of positive correlation with the cycle of described equivalent switch periodic signal according to described equivalent switch periodic signal generating period, wherein, described positive correlation refers to that the cycle of switching signal is long, then the cycle detecting pulse is long; The cycle of switching signal is short, then the cycle detecting pulse is short.
2. detect pulse generator according to claim 1, it is characterized in that, the energy transform device primary energy end of transmission of described detection pulse in described Switching Power Supply with on once produce during Energy Transfer.
3. detect pulse generator according to claim 2, it is characterized in that, described energy transform device is outputting inductance, and Energy Transfer is the charge and discharge process of described outputting inductance.
4. according to claim 1 or 2, detect pulse generator, it is characterized in that, the width of described detection pulse high level is predetermined width.
5. detect pulse generator according to claim 1, it is characterized in that,
Control signal acts on another input of described switching signal cycle detection module, and described switching signal cycle detection module is also for before first switching signal produces, and control signal control switch signal period detection module exports high level;
Accordingly, when described detection pulse generate module is also for detecting that described switching signal cycle detection module exports high level always, generate the detection pulse of predetermined period.
6. detect pulse generator according to claim 5, it is characterized in that, described detection pulse generate module specifically comprises:
Oscillator, counter, encoder, first and door, d type flip flop, MUX, second and door and trigger element;
The output of described oscillator is connected with the input end of clock of described counter, the output of described counter is connected one to one with the input of described MUX respectively, the output of described counter is connected one to one with the input of described encoder respectively, asserts signal acts on the set end S and described first of described counter and an input of door respectively, reset signal acts on the reset terminal R of described counter, the output of described encoder is connected one to one with the input of described d type flip flop respectively, the input end of clock of described d type flip flop is connected with the output of door with described first, the output of described d type flip flop is connected one to one with the data selection end of described MUX respectively, described first is connected with the output of described switching signal cycle detection module with another input of door, the output of described MUX is connected with an input of door with described second, described second is connected with the output of described switching signal cycle detection module with another input of door, described second is connected with the input of described trigger element with the output of door, the output of described trigger element is the output of described detection pulse generate module,
Before first switching signal produces, described switching signal cycle detection module exports high level always, described asserts signal is low level and carries out initialization to described counter to obtain primary data, after to described counter initialization, described asserts signal is converted to high level, the level of described asserts signal by low transition to high level time, described MUX is initialised, after first switching signal produces, described equivalent switch periodic signal acts on the input of described first and door, the signal of the time width of the width that described reset signal is high level needed for described counter resets, the time difference of the rising edge of described reset signal and the rising edge of described equivalent switch periodic signal is that the data of input are passed to the time of output by described d type flip flop, described trigger element generates the signal exported with described MUX and has the same cycle and the width of high level is the detection pulse of predetermined width.
7. detect pulse generator according to claim 6, it is characterized in that, described encoder also comprises preset upper limit numerical value and pre-determined lower limit numerical value;
Described encoder is also for judging the output numerical value of described counter, when the output numerical value of described counter is greater than described preset upper limit numerical value, described preset upper limit numerical value is encoded, and data after output encoder, when the output numerical value of described counter is less than described pre-determined lower limit numerical value, described pre-determined lower limit numerical value is encoded, and the data after output encoder.
8. detect pulse generator according to claim 1, it is characterized in that, shielded signal acts on another input of described detection pulse generate module, the energy transform device primary energy end of transmission in the Switching Power Supply that described shielded signal controls at Bang-Bang with on be once high level during Energy Transfer, be low level in the energy transport of described energy transform device.
9. detect pulse generator according to claim 8, it is characterized in that, described detection pulse generate module specifically comprises:
Oscillator, counter, encoder, first and door, d type flip flop, MUX, second and door and trigger element;
The output of described oscillator is connected with the input end of clock of described counter, the output of described counter is connected one to one with the input of described MUX respectively, the output of described counter is connected one to one with the input of described encoder respectively, asserts signal acts on the set end S and described first of described counter and an input of door respectively, reset signal acts on the reset terminal R of described counter, the output of described encoder is connected one to one with the input of described d type flip flop respectively, the input end of clock of described d type flip flop is connected with the output of door with described first, the output of described d type flip flop is connected one to one with the data selection end of described MUX respectively, described first is connected with the output of described switching signal cycle detection module with another input of door, the output of described MUX is connected with an input of door with described second, described shielded signal acts on another input of described second and door, described second is connected with the input of described trigger element with the output of door, the output of described trigger element is the output of described detection pulse generate module,
Before first switching signal produces, described switching signal cycle detection module exports high level always, described asserts signal is low level and carries out initialization to described counter to obtain primary data, after to described counter initialization, described asserts signal is converted to high level, the level of described asserts signal by low transition to high level time, described MUX is initialised, after first switching signal produces, described equivalent switch periodic signal acts on the input of described first and door, the signal of the time width of the width that described reset signal is high level needed for described counter resets, the time difference of the rising edge of described reset signal and the rising edge of described equivalent switch periodic signal is that the data of input are passed to the time of output by described d type flip flop, described trigger element generates the signal exported with described MUX and has the same cycle and the width of high level is the detection pulse of predetermined width.
10. a control chip, is applied to the Switching Power Supply that Bang-Bang controls, it is characterized in that, comprise described in any one of claim 1-9 and detect pulse generator.
11. control chips according to claim 10, is characterized in that, the signal of described embodiment current switch signal period is the signal on control chip FB pin, the signal on control chip CS pin and one or more in current switch signal.
12. control chips according to claim 10, is characterized in that, embody the signal on FB pin that the signal of switch power source output voltage is control chip and current switch signal;
When described switching signal cycle detection module detects that the rising edge of described current switch signal arrives, arrive the time for benchmark with the rising edge of described current switch signal, when detecting that first trailing edge of the signal on described FB pin arrives, generate the trailing edge of described equivalent switch periodic signal, when detecting that second trailing edge of the signal on described FB pin arrives, generate the rising edge of described equivalent switch periodic signal.
The Switching Power Supply that 13. 1 kinds of Bang-Bang control, is characterized in that, comprises the control chip detecting pulse generator described in any one of claim 1-9 or comprise described in any one of claim 10-12.
14. 1 kinds are detected pulse generation method, and be applied to the Switching Power Supply that Bang-Bang controls, it is characterized in that, the method comprises:
Signal according to embodying the current switch signal period generates and the synperiodic equivalent switch periodic signal of described current switch signal;
Become the detection pulse of positive correlation with the cycle of described equivalent switch periodic signal according to described equivalent switch periodic signal generating period, wherein, described positive correlation refers to that the cycle of switching signal is long, then the cycle detecting pulse is long; The cycle of switching signal is short, then the cycle detecting pulse is short.
15., according to method described in claim 14, is characterized in that, the energy transform device primary energy end of transmission of described detection pulse in described Switching Power Supply with on once produce during Energy Transfer.
16., according to method described in claim 15, is characterized in that, described energy transform device is outputting inductance, and Energy Transfer is the charge and discharge process of described outputting inductance.
17. according to any one of claim 14-16 method, it is characterized in that, the high level width of described detection pulse is predetermined width.
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| CN104836209B (en) | 2015-04-30 | 2018-01-23 | 华为技术有限公司 | A kind of digital power protection circuit and device |
| CN111416505B (en) * | 2020-04-14 | 2021-05-11 | 上海顺久电子科技有限公司 | Switching power supply converter |
| CN112290612B (en) * | 2020-09-18 | 2022-08-23 | 上海芯导电子科技股份有限公司 | Light-load detection circuit |
| CN112859994A (en) * | 2021-01-11 | 2021-05-28 | 湖南国科微电子股份有限公司 | Voltage regulation method, device, equipment and medium of integrated chip |
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Effective date of registration: 20210203 Address after: No. 1600, Zixing Road, Minhang District, Shanghai 200241 Patentee after: BCD (SHANGHAI) MICRO-ELECTRONICS Ltd. Address before: 200233 No. 800, Xuhui District, Shanghai, Yishan Road Patentee before: BCD Semiconductor Manufacturing Ltd. |