CN105305810A - Improved charge pump circuit system - Google Patents
Improved charge pump circuit system Download PDFInfo
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- CN105305810A CN105305810A CN201410234235.7A CN201410234235A CN105305810A CN 105305810 A CN105305810 A CN 105305810A CN 201410234235 A CN201410234235 A CN 201410234235A CN 105305810 A CN105305810 A CN 105305810A
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- switching device
- charge pump
- pump circuit
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Abstract
The invention discloses an improved charge pump circuit system, and relates to a circuit system. The improved charge pump circuit system comprises a charge pump circuit and a control circuit, wherein the charge pump circuit outputs voltage to a controlled load; the control circuit outputs a first control signal to the charge pump circuit in a controllable manner, and outputs a second control signal to the controlled load within a scheduled time period after corresponding first control signal is generated in the controllable manner; the charge pump circuit comprises a switching control signal generation circuit and a work circuit with an energy-storage capacitor; at least two paths of reference voltage with different voltage values selectively provide one path of reference voltage to the switching control signal generation circuit under the action of the first control signal to generate a switching control signal and to change the on and off time of a switching device array; and the work circuit with the energy-storage capacitor changes the charge and discharge time of the energy-storage capacitor under the action of the switching device array to stably output the voltage. According to the improved charge pump circuit system, when load current instantaneously changes, output voltage can still be maintained within a preset tolerance range; and the transient response of the circuit is improved to ensure the stability of the system.
Description
Technical field
The present invention relates to electronic technology field, be specifically related to a kind of Circuits System.
Background technology
Charge pump circuit is the circuit that a kind of build-up effect using electric charge in electric capacity produces higher than supply voltage or negative voltage, be widely used in serial communication circuit, EEPROM, dynamic random access memorys etc. need battery powered field, portable set usually needs to arrange multiple power supply, to provide audio frequency respectively, illumination, communication, each functional unit such as equipment control, along with the needs of expanding of system function, dedicated charge pump circuit must be increased at the later stage of system development in prior art to power to various option, as camera model, bluetooth, WiFi and other link block.Concerning battery powered portable product, increase number of batteries, volume and the weight of product can be had influence on; The unexpected increase of load simultaneously or reduction, the steady operation of meeting influential system.A kind of common system configuration of prior art as shown in Figure 1, comprise a controlled load, one charge pump circuit, one control circuit, system in the course of the work, when needs increase by controlled load works, control circuit directly transmits control signal to controlled load, charge pump circuit provides output voltage to controlled load, the voltage-vs-time of existing system or the oscillogram of current-vs-time are as shown in Figure 2, the shortcoming that this control system exists is: it is larger that the unexpected increase of controlled load or reduction make output voltage fluctuate, output voltage can be caused to fluctuate larger, the steady operation of influential system.
Summary of the invention
The object of the invention is to, a kind of charge pump circuit system of improvement is provided, solves above technical problem;
Technical problem solved by the invention can realize by the following technical solutions:
A charge pump circuit system for improvement, wherein, comprises a charge pump circuit, and described charge pump circuit produces output voltage and exports controlled load to; Also comprise a control circuit, described control circuit comprises:
First control signal output, is connected with described charge pump circuit, and controllablely exports the first control signal to described charge pump circuit;
Second control signal output, is connected with described controlled load, and the controllable scheduled time after described first control signal generation accordingly exports the second control signal to described controlled load;
Described controlled load changes operating current under described second control signal controls;
Described charge pump circuit comprises:
One switching device array, alternate conduction or shutoff under one group of switch controlling signal effect;
One switch controlling signal produces circuit, the reference voltage that at least two-way has a different magnitude of voltage selectively provides a road reference voltage to produce circuit to described switch controlling signal under described first control signal effect, described switch controlling signal produces circuit according to described reference voltage and a feedback voltage, produce described switch controlling signal, to change the turn-on and turn-off time of described switching device array;
One operating circuit being provided with storage capacitor, changes the discharge and recharge time of described storage capacitor, with regulated output voltage under the effect of described switching device array.
Preferably, described charge pump circuit comprises a selector switch, the input of described selector switch is connected with at least reference voltage described in two-way, the control end of described selector switch connects described first control signal, and under the effect of described first control signal, reference voltage described in selection one tunnel exports described switch controlling signal to and produces circuit.
Preferably, described charge pump circuit comprises an Input voltage terminal, an output voltage terminal, an earth terminal; The first switching device group in described switching device array is connected in series between described Input voltage terminal with described earth terminal; The second switch device group in described switching device array is connected in series between described output voltage terminal with described earth terminal; One first storage capacitor is connected across between described first switching device group and described second switch device group; One second storage capacitor is connected between described output voltage terminal and described earth terminal.
Preferably, described switch controlling signal produces circuit and comprises,
One comparing unit, for comparing described reference voltage and described feedback voltage, produces a comparison signal;
One control electrical appliances for electric charge pump, is connected with the output of described comparing unit, for producing switch controlling signal described in a group under the effect of described comparison signal.
Preferably, at least two-way reference voltage is produced by a bandgap voltage reference generator.
Preferably, described first switching device group comprises the first switching device and the second switch device of series connection mutually, described second switch device group comprises the 3rd switching device and the 4th switching device of series connection mutually, the point that one end described first switching device of connection of described first storage capacitor and described second switch device are in series, the other end of described first storage capacitor connects the point of described 3rd switching device and described 4th switching device series connection.
Preferably, described first switching device adopts P channel mosfet, and described second switch device adopts N-channel MOS FET; The source electrode of described first switching device connects described Input voltage terminal, and the source electrode of described second switch device connects described earth terminal, and the drain electrode of described first switching device connects the drain electrode of described second switch device.
Preferably, described 3rd switching device adopts N-channel MOS FET, and described 4th switching device adopts N-channel MOS FET; The source electrode of described 3rd switching device connects described output voltage terminal, and the drain electrode of described 4th switching device connects described earth terminal, and the drain electrode of described 3rd switching device connects the source electrode of described 4th switching device.
Preferably, described feedback voltage is produced by a feedback network, and described feedback network is connected between described output voltage terminal and described earth terminal, in order to produce described feedback voltage.
Preferably, described feedback network is formed primarily of a resistor voltage divider circuit, described resistor voltage divider circuit comprises predetermined number and is connected in series with each other the divider resistance between described output voltage terminal and described earth terminal, and the point be connected between described divider resistance forms divider node; Described feedback voltage is drawn from predetermined divider node place.
Beneficial effect: owing to adopting above technical scheme, the present invention, before change controlled load, controls charge pump circuit output voltage and changes, make when load current generation transition, output voltage also can maintain in predetermined range of tolerable variance, improves the transient response of circuit, to guarantee system stability.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of prior art;
Fig. 2 is the oscillogram of output voltage transient response and controlled load electric current when controlled load increases suddenly in prior art;
Fig. 3 is system architecture schematic diagram of the present invention;
Fig. 4 is charge pump circuit schematic diagram of the present invention;
Fig. 5 is the oscillogram of main signal 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, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
With reference to Fig. 3, Fig. 4, a kind of charge pump circuit system of improvement, wherein, comprise a charge pump circuit 1, charge pump circuit 1 produces output voltage and exports controlled load 3 to; Also comprise a control circuit 2, control circuit 2 comprises:
First control signal output, is connected with charge pump circuit 1, and controllablely exports the first control signal s1 to charge pump circuit 1;
Second control signal output, is connected with controlled load 3, and the controllable scheduled time after corresponding first control signal s1 produces exports the second control signal s2 to controlled load 3;
Controlled load 3 changes operating current under the second control signal s2 controls;
Charge pump circuit 1 comprises:
One switching device array 13, alternate conduction or shutoff under one group of switch controlling signal effect;
One switch controlling signal produces circuit 12, the reference voltage that at least two-way has a different magnitude of voltage selectively provides a road reference voltage to produce circuit 12 to switch controlling signal under the first control signal s1 effect, switch controlling signal produces circuit 12 benchmark voltage Vref and a feedback voltage, produce switch controlling signal, to change the turn-on and turn-off time of switching device array 13;
One operating circuit being provided with storage capacitor, acts on the lower discharge and recharge time changing storage capacitor, with regulated output voltage Vout in switching device array 13.
The present invention can before system needs increase or reduces controlled load 3, control the reference voltage that charge pump circuit 1 selects setting, make when load current generation transition, output voltage Vout also can maintain in predetermined range of tolerable variance, improve the transient response of circuit, to guarantee system stability.
As a kind of preferred embodiment of the present invention, charge pump circuit 1 comprises a selector switch 11, the input of selector switch 11 is connected with at least two-way reference voltage, the control end of selector switch 11 connects the first control signal s1, and under the effect of the first control signal s1, selection one road reference voltage exports.
As a kind of preferred embodiment of the present invention, charge pump circuit 1 comprises an Input voltage terminal VDD, an output voltage terminal Vout, an earth terminal GND; The first switching device group in switching device array 13 is connected in series between Input voltage terminal VDD with earth terminal GND; The second switch device group in switching device array 13 is connected in series between output voltage terminal Vout with earth terminal GND; One first storage capacitor C1 is connected across between the first switching device group and second switch device group; One second storage capacitor C2 is connected between output voltage terminal Vout and earth terminal GND.
As a kind of preferred embodiment of the present invention, switch controlling signal produces circuit 12 and can comprise,
One comparing unit 123, for comparing reference voltage V ref and feedback voltage, produces a comparison signal;
One control electrical appliances for electric charge pump 121, is connected with the output of comparing unit 123, for producing one group of switch controlling signal under the effect of comparison signal.
As a kind of preferred embodiment of the present invention, selector switch 11 has multiple signal input part and a signal output part, a signal input part connects a road reference voltage, and signal output part connects comparing unit 123, to provide reference voltage V ref to comparing unit 123.As a kind of preferred embodiment of the present invention, at least two-way reference voltage can be produced by a bandgap voltage reference generator.Bandgap voltage reference, because having low temperature coefficient, high PSRR, the stability advantage such as good, is widely adopted.The reference voltage had nothing to do with power supply, technique, temperature is produced by bandgap voltage reference.
As a kind of preferred embodiment of the present invention, first switching device group comprises the first switching device Mp and the second switch device Mn1 of series connection mutually, second switch device group comprises the 3rd switching device Mn3 and the 4th switching device Mn2 of series connection mutually, one end of first storage capacitor C1 connects the point that the first switching device Mp and second switch device Mn1 is in series, and the other end of the first storage capacitor C1 connects the point that the 3rd switching device Mn3 and the 4th switching device Mn2 connects.
As a kind of preferred embodiment of the present invention, the first switching device Mp adopts P channel mosfet, and second switch device Mn1 adopts N-channel MOS FET; The source electrode of the first switching device Mp connects Input voltage terminal VDD, and the source electrode of second switch device Mn1 connects earth terminal GND, and the drain electrode of the first switching device Mp connects the drain electrode of second switch device Mn1.
As a kind of preferred embodiment of the present invention, the 3rd switching device Mn3 adopts N-channel MOS FET, and the 4th switching device Mn2 adopts N-channel MOS FET; The source electrode of the 3rd switching device Mn3 connects output voltage terminal Vout, and the drain electrode of the 4th switching device Mn2 connects earth terminal GND, and the drain electrode of the 3rd switching device Mn3 connects the source electrode of the 4th switching device Mn2.
The grid connection control signal MpCtrl of the first above-mentioned switching device Mp, the grid connection control signal Mn1Ctrl of second switch device Mn1, the grid connection control signal Mn3Ctrl of the 3rd switching device Mn3, the grid connection control signal Mn2Ctrl of the 4th switching device Mn2, this group switch controlling signal produces circuit 12 by switch controlling signal and obtains according to after the reference voltage V ref selected and feedback voltage.
A kind of course of work of the present invention is as follows: when control electrical appliances for electric charge pump 121 is by providing complementary control signal to make the first switching device Mp and the 4th switching device Mn2 conducting, second switch device Mn1 and the 3rd switching device Mn3 disconnects, the positive voltage of Input voltage terminal VDD charges to the first storage capacitor C1, voltage on first storage capacitor C1 is VDD, when the first switching device Mp and the 4th switching device Mn2 disconnects, when second switch device Mn1 and the 3rd switching device Mn3 conducting, first storage capacitor C1 discharges to the second storage capacitor C2, the voltage that second storage capacitor C2 fills is-VDD, namely output voltage terminal Vout is negative voltage, size equals-VDD.
As a kind of preferred embodiment of the present invention, feedback voltage is produced by a feedback network 122, and feedback network 122 is connected between output voltage terminal Vout and earth terminal GND, in order to produce feedback voltage.
As a kind of preferred embodiment of the present invention, feedback network 122 is formed primarily of a resistor voltage divider circuit, resistor voltage divider circuit comprises predetermined number and is connected in series with each other the divider resistance between output voltage terminal Vout and earth terminal GND, and the point be connected between divider resistance forms divider node; Feedback voltage signal is drawn from predetermined divider node place.
With reference to Fig. 4, a kind of specific embodiment, the present invention can comprise two reference voltages, be respectively the first reference voltage V ref1 and the second reference voltage V ref2, the magnitude of voltage of one of them reference voltage is greater than the magnitude of voltage of another reference voltage, if the first reference voltage V ref1 is 0.5V, second reference voltage V ref2 is 0.56V or 0.6V, when controlled load needs to increase, by the reference voltage that the first control signal s1 control linear voltage stabilizing circuit 1 Selection radio current base voltage is less, make before controlled load access, output voltage can first decline, after access controlled load, output voltage rises, object is when transition occurs load current ILoad, output voltage Vout also can maintain in predetermined range of tolerable variance, improve the transient response of circuit.Oscillogram shown in composition graphs 5 can be found out, when adopting control system of the present invention that load can be made to increase, the fluctuation of charge pump circuit output voltage is less, is conducive to the steady operation of system.
As a kind of preferred embodiment of the present invention, before the second control signal output exports the second control signal s2 to controlled load 3, the first control signal s1 output exports the first control signal s1 to linear voltage-stabilizing circuit 1.Namely the second control signal s2 compares the delay that the first control signal s1 has a setting-up time, before ensureing controlled load 3 connecting system, and the corresponding change of output voltage Vout.
The present invention can also realize on the basis not increasing charge pump circuit quantity, realizes the normal table work of system.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilizations specification of the present invention and diagramatic content and apparent change obtain in protection scope of the present invention.
Claims (10)
1. the charge pump circuit system improved, is characterized in that, comprise a charge pump circuit, and described charge pump circuit produces output voltage and exports controlled load to; Also comprise a control circuit, described control circuit comprises:
First control signal output, is connected with described charge pump circuit, and controllablely exports the first control signal to described charge pump circuit;
Second control signal output, is connected with described controlled load, and the controllable scheduled time after described first control signal generation accordingly exports the second control signal to described controlled load;
Described controlled load changes operating current under described second control signal controls;
Described charge pump circuit comprises:
One switching device array, alternate conduction or shutoff under one group of switch controlling signal effect;
One switch controlling signal produces circuit, the reference voltage that at least two-way has a different magnitude of voltage selectively provides a road reference voltage to produce circuit to described switch controlling signal under described first control signal effect, described switch controlling signal produces circuit according to described reference voltage and a feedback voltage, produce described switch controlling signal, to change the turn-on and turn-off time of described switching device array;
One operating circuit being provided with storage capacitor, changes the discharge and recharge time of described storage capacitor, with regulated output voltage under the effect of described switching device array.
2. the charge pump circuit system of a kind of improvement according to claim 1, it is characterized in that, described charge pump circuit comprises a selector switch, the input of described selector switch is connected with at least reference voltage described in two-way, the control end of described selector switch connects described first control signal, and under the effect of described first control signal, reference voltage described in selection one tunnel exports described switch controlling signal and produces circuit.
3. the charge pump circuit system of a kind of improvement according to claim 1, is characterized in that, described charge pump circuit comprises an Input voltage terminal, an output voltage terminal, an earth terminal; The first switching device group in described switching device array is connected in series between described Input voltage terminal with described earth terminal; The second switch device group in described switching device array is connected in series between described output voltage terminal with described earth terminal; One first storage capacitor is connected across between described first switching device group and described second switch device group; One second storage capacitor is connected between described output voltage terminal and described earth terminal.
4. the charge pump circuit system of a kind of improvement according to claim 1, is characterized in that, described switch controlling signal produces circuit and comprises,
One comparing unit, for comparing described reference voltage and described feedback voltage, produces a comparison signal;
One control electrical appliances for electric charge pump, is connected with the output of described comparing unit, for producing switch controlling signal described in a group under the effect of described comparison signal.
5. the charge pump circuit system of a kind of improvement according to claim 1, is characterized in that, at least two-way reference voltage is produced by a bandgap voltage reference generator.
6. the charge pump circuit system of a kind of improvement according to claim 3, it is characterized in that, described first switching device group comprises the first switching device and the second switch device of series connection mutually, described second switch device group comprises the 3rd switching device and the 4th switching device of series connection mutually, the point that one end described first switching device of connection of described first storage capacitor and described second switch device are in series, the other end of described first storage capacitor connects the point of described 3rd switching device and described 4th switching device series connection.
7. the charge pump circuit system of a kind of improvement according to claim 6, is characterized in that, described first switching device adopts P channel mosfet, and described second switch device adopts N-channel MOS FET; The source electrode of described first switching device connects described Input voltage terminal, and the source electrode of described second switch device connects described earth terminal, and the drain electrode of described first switching device connects the drain electrode of described second switch device.
8. the charge pump circuit system of a kind of improvement according to claim 6, is characterized in that, described 3rd switching device adopts N-channel MOS FET, and described 4th switching device adopts N-channel MOS FET; The source electrode of described 3rd switching device connects described output voltage terminal, and the drain electrode of described 4th switching device connects described earth terminal, and the drain electrode of described 3rd switching device connects the source electrode of described 4th switching device.
9. the charge pump circuit system of a kind of improvement according to claim 3, is characterized in that, described feedback voltage is produced by a feedback network, and described feedback network is connected between described output voltage terminal and described earth terminal, in order to produce described feedback voltage.
10. the charge pump circuit system of a kind of improvement according to claim 9, it is characterized in that, described feedback network is formed primarily of a resistor voltage divider circuit, described resistor voltage divider circuit comprises predetermined number and is connected in series with each other the divider resistance between described output voltage terminal and described earth terminal, and the point be connected between described divider resistance forms divider node; Described feedback voltage is drawn from predetermined divider node place.
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| CN201410234235.7A CN105305810A (en) | 2014-05-29 | 2014-05-29 | Improved charge pump circuit system |
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| CN201410234235.7A CN105305810A (en) | 2014-05-29 | 2014-05-29 | Improved charge pump circuit system |
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| CN109639118A (en) * | 2019-01-23 | 2019-04-16 | 深圳市芯飞凌半导体有限公司 | Self-powered circuit, control chip and the Switching Power Supply and electric device of Switching Power Supply |
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