CN120582470B - Intelligent self-bias power supply switching power supply system - Google Patents
Intelligent self-bias power supply switching power supply systemInfo
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Abstract
The invention discloses an intelligent self-bias power supply switching power supply system, which relates to the technical field of switching power supplies and comprises an alternating current-to-direct current module, a control chip and a power stage circuit based on a selected power conversion topology, wherein the control chip comprises a chip control circuit connected with the power stage circuit, and an energy storage element is arranged on a power supply input side of the chip control circuit. The invention can omit a starting resistor and an auxiliary winding of a transformer, simplify the system design, reduce standby power consumption and EMI interference, is particularly suitable for a fast charging source system with variable output voltage, and obviously saves the cost of a controller chip.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to an intelligent self-bias power supply switching power supply system.
Background
Switching power supply technology plays a vital role in modern electronic devices, particularly in alternating current-to-direct current (AC-DC) fast charge source systems, where the efficiency and stability directly affect the performance and reliability of the device. The existing alternating current-to-direct current (AC-DC) power supply system generally comprises an AC-to-DC module, a power topology architecture and a control chip, and has the following defects:
(1) For a fast charging source system with variable output voltage, the power supply voltage VDD of the control chip and the output voltage Vo of the system are in direct proportion, so that the VDD power supply pin of the control chip needs a very wide voltage-withstanding range, and the cost of the control chip is greatly increased. Taking a USB PD fast charging source system as an example, wherein the output voltage range of the USB PD3.0 fast charging source system is 3-21V, and the USB PD3.1 fast charging source system requires 3-48V, if the output voltage Vo is 7 times of 3-21V, the power supply voltage VDD of the control chip is required to be 7 times of the voltage range, namely, if the minimum working voltage of the control chip is 10V, the maximum working voltage of the control chip is required to be at least 70V, and if the output voltage Vo is 16 times of 3-48V, the working voltage range of the control chip is required to be 10-160V.
(2) For a resistor starting power supply system, after the starting process is finished, the starting resistor still has power consumption, and the low standby power consumption standard requirement is difficult to meet. Taking the conventional alternating current-to-direct current (AC-DC) flyback power supply system shown in fig. 1 as an example, if the starting resistor rst1=rst2=2mΩ and the AC input is 220V, the power loss of the starting resistors rst1 and rst2 reaches 24.2mW.
(3) In addition, for the existing AC-DC flyback power supply system shown in fig. 1, it requires an auxiliary winding of a transformer and a diode and a capacitor to supply power to the controller chip, resulting in a complicated structure of the transformer and an increase in system cost.
Disclosure of Invention
The invention aims to provide an intelligent self-bias power supply switching power supply system which can solve the problems.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
The utility model provides an intelligence self-bias power supply switching power supply system, includes alternating current to direct current module, control chip and power stage circuit based on selected power conversion topology, control chip is including connecting power stage circuit's chip control circuit, chip control circuit's power supply input side sets up the energy storage element, control chip still includes intelligence self-bias power supply control circuit, this intelligence self-bias power supply control circuit is used for follow alternating current to direct current module's alternating current side gets positive polarity voltage, for energy storage element and chip control circuit power supply.
Further, the control chip is provided with a VDD pin and an HV pin, where the VDD pin is connected to the energy storage element and a power supply input end of the chip control circuit, and the HV pin is connected to an ac side of the ac-dc module through a rectifying circuit, and the rectifying circuit is configured to convert a negative polarity voltage from the ac side of the ac-dc module into a positive polarity voltage.
Optionally, the rectifying circuit has only one diode, the power input end of the intelligent self-bias power supply control circuit is connected with the cathode of the diode, and the anode of the diode is connected with the live wire or the zero wire of the alternating current side of the alternating current-to-direct current module;
Or alternatively
The rectification circuit comprises two diodes, the power input end of the intelligent self-bias power supply control circuit is connected with the cathodes of the two diodes, and the anodes of the two diodes are respectively connected with the live wire and the zero wire of the alternating current side of the alternating current-direct current module.
Optionally, the energy storage element is a capacitor, one end of the capacitor is grounded, and the other end of the capacitor is connected to the VDD pin.
Optionally, the power conversion topology is one of buck, boost, buck, forward, flyback, half-bridge, and full-bridge.
Optionally, the intelligent self-bias power supply control circuit adaptively adjusts the maximum charging voltage of the energy storage element according to the set VDD pin voltage and the current consumed by the chip control circuit.
The intelligent self-bias power supply control circuit comprises a switch SW1, a diode D5, a resistor R9, a UVLO module, an LDO module and a self-power closed-loop control circuit, wherein the input end of the switch SW1 is used as the power input end of the intelligent self-bias power supply control circuit and is connected with the first input end and an HV pin of the self-power closed-loop control circuit, the output end of the switch SW1 is connected with the positive end of the diode D5, the control end of the switch SW1 is connected with the output end of the self-power closed-loop control circuit and is grounded through the resistor R9, the second input end of the self-power closed-loop control circuit is connected with the negative end of the diode D5, the input end of the UVLO module and the VDD pin, and the output voltage signal of the UVLO module is used for controlling to turn on or turn off the self-power closed-loop control circuit.
The self-powered closed-loop control circuit comprises voltage dividing resistors R4 and R5, an error amplifier EA1, a filter loop resistor R8 and a capacitor C8, a comparator CMP1 and voltage dividing resistors R6 and R7, wherein one end of the voltage dividing resistor R4 is used as a second input end of the self-powered closed-loop control circuit, the other end of the voltage dividing resistor R4 is connected with the voltage dividing resistor R5 to form a first voltage dividing node, the first voltage dividing node is connected with a negative input end of the difference amplifier EA1, a positive input end of the error amplifier EA1 is connected with a reference voltage, the voltage of a VDD pin is set through the reference voltage, the output end of the error amplifier EA1 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the negative input end of the comparator CMP1, and is grounded through the capacitor C8, one end of the voltage dividing resistor R6 is used as a first input end of the self-powered closed-loop control circuit, the other end of the voltage dividing resistor R7 is connected with the positive input end of the comparator CMP1 to form a second voltage dividing node, the output end of the self-powered closed-loop control circuit is connected with the positive input end of the comparator CMP1, the output end of the comparator CMP1 is the output end of the self-powered closed-loop control circuit, the error amplifier EA1 is connected with the output end of the LDO.
The intelligent self-bias power supply control circuit comprises a switch SW21, a diode D22, a resistor R25, a UVLO module, an LDO module and a self-power closed-loop control circuit, wherein the maximum charging voltage provided by the intelligent self-bias power supply control circuit for the energy storage element is fixed, the self-power closed-loop control circuit comprises a divider resistor R21 and a resistor R22, a comparator CMP21, or a comparator R20 and divider resistors R23 and R24, one end of the divider resistor R21 is connected with the negative end of the diode D22, the input end of the UVLO module and the VDD pin, the other end of the divider resistor R22 is connected with the divider resistor R22 and forms a first divider node, the first divider node is connected with the positive input end of the comparator CMP20, the negative input end of the comparator CMP20 is connected with a first reference voltage, one end of the divider resistor R23 is connected with the input end of the HV pin and the input end of the switch SW21, the other end of the divider resistor R24 is connected with the divider resistor CMP21 and forms a second divider node, one end of the divider resistor CMP21 is connected with the negative input end of the comparator CMP21 and the output end of the divider resistor SW21 is connected with the output end of the comparator SW 20, and the output end of the divider SW21 is connected with the positive input end of the comparator SW21 and the output end of the comparator SW21 is connected with the output end of the comparator or the comparator SW 20, and the output end of the comparator SW21 is connected with the positive input end of the comparator or the output end of the comparator or the comparator SW 21.
The intelligent self-bias power supply control circuit comprises a switch SW31, a diode D32, a resistor R25, a UVLO module, an LDO module and a self-power closed-loop control circuit, wherein the self-power closed-loop control circuit comprises a divider resistor R31 and a resistor R32, a comparator CMP30, an OR20, a timing unit, a zero crossing detection module and divider resistors R23 and R24, one end of the divider resistor R31 is connected with the negative end of the diode D32, the input end of the UVLO module is connected with the VDD pin, the other end of the divider resistor R22 is connected with the divider resistor R22 and forms a first divider node, the first divider node is connected with the positive input end of the comparator CMP30, the negative input end of the comparator CMP30 is connected with a reference voltage, one end of the divider resistor R23 is connected with the input end of the switch SW31, the other end of the divider resistor R24 is connected with the divider resistor R30 and forms a second divider node, the timing unit is connected with the zero crossing detection module, the positive end of the divider resistor SW31 is connected with the output end of the comparator SW 30, the positive end of the divider resistor SW 30 is connected with the output end of the comparator SW 30, and the positive end of the output end of the divider resistor SW 30 is connected with the output end of the comparator SW 30 is connected with the timing unit, and the output end of the timing unit is connected with the timing unit.
Compared with the prior art, the invention has the beneficial effects that:
1) The intelligent self-bias power supply control circuit is additionally arranged on the basis of the existing power supply system, and takes positive voltage from the alternating current side of the alternating current-to-direct current module to supply power to the energy storage element and the chip control circuit, so that the intelligent self-bias power supply control circuit can be applied to a fast charging source system with variable output voltage, such as a USB PD system, a control chip power supply pin VDD does not need to be high in withstand voltage, and in a traditional USB PD fast charging source system, the power supply voltage of the controller and the output voltage are in direct proportion, so that the VDD power supply pin of the controller chip needs to be in a very high withstand voltage range, and the cost of the control chip is greatly saved.
2) Compared with the traditional flyback power supply system control architecture of fig. 1, the invention saves devices such as high-voltage starting resistors Rst1 and Rst2, a transformer auxiliary winding Aux, a rectifier diode D11 and the like, simplifies the design of a transformer and the design of a power supply system, and greatly saves the cost of the system.
3) The invention does not need a starting circuit, and the traditional flyback power supply starting resistor Rst1/Rst2 of fig. 1 consumes power after starting is finished, so that the idle or light-load standby power consumption of the power supply system is greatly reduced, and the harshest standby power consumption and energy efficiency standard requirements can be easily met.
4) In the power stage circuit based on the selected power conversion topology, the transformer does not need an auxiliary winding to control power supply to the chip, the EMI of the transformer can be obviously improved, the EMI can be easily authenticated without a complex EMI filter device, and the system cost is greatly saved.
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a typical application of a prior art flyback power supply system;
fig. 2 is a schematic structural diagram of an intelligent self-bias power supply switching power supply system in embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of the structure of the intelligent self-bias power supply control circuit in embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of the AC-DC module and the power stage circuit based on the selected power conversion topology (flyback) in embodiment 1 of the present invention;
fig. 5 is a schematic circuit diagram of a switch of the intelligent self-bias power supply control circuit in embodiment 1 of the present invention;
FIG. 6 is a timing diagram of the start-up of the smart self-bias power supply in embodiment 1 of the present invention;
FIG. 7 is a waveform diagram of the steady state timing of the intelligent self-bias power supply in embodiment 1 of the present invention;
FIG. 8 is a schematic diagram of the structure of the intelligent self-bias power supply control circuit in embodiment 2 of the present invention;
FIG. 9 is a schematic diagram of the structure of the intelligent self-bias power supply control circuit in embodiment 3 of the present invention;
fig. 10 is a case where the HV pin is only powered from the ac side hot wire in embodiment 4 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.
Example 1
Referring to fig. 2, 3 and 4, an embodiment of the present invention provides an intelligent self-bias power supply switching power supply system, which includes an ac-to-dc module, a control chip IC1 and a power stage circuit based on a selected power conversion topology.
The specific form of the AC-dc module is shown in fig. 2 and 4, and includes a rectifier bridge B1 and a capacitor C1, where the AC side inputs AC 90-264 v.
The power conversion topology of the power stage circuit may be a buck-type, boost-type, buck-type, forward-type, flyback-type, half-bridge, full-bridge, etc., and in this embodiment, the power conversion topology of the power stage circuit is flyback-type, and its specific form is shown in fig. 4, and includes a transformer T1, a buffer, a diode D1, a capacitor Cout, resistors R0, R1, R2, R3, a capacitor C2, an error amplifier TL431, an optocoupler feedback device OPTO, a power regulation switch M1, and a resistor Rcs.
In this embodiment, as shown in fig. 2, the control chip IC1 includes an intelligent self-bias power supply control circuit and a chip control circuit connected to the power stage circuit, where the power supply input side of the chip control circuit is provided with an energy storage capacitor C3, and the intelligent self-bias power supply control circuit is configured to take positive voltage from the ac side of the ac-dc module to supply power to the capacitor C3 and the chip control circuit. The control chip IC1 is provided with a VDD pin, an HV pin, a GATE pin, a CS pin, an FB pin, and a GND pin. The VDD pin is connected with the capacitor C3 and the power supply input end of the chip control circuit, the HV pin is connected with the alternating current side of the alternating current-to-direct current module through the rectifying circuit, and the rectifying circuit is used for converting negative polarity voltage from the alternating current side of the alternating current-to-direct current module into positive polarity voltage.
Further, the rectifying circuit includes two diodes D2 and D3 as shown in fig. 2 and 4, the cathodes of the two diodes are connected to the HV pin, the anodes of the two diodes are respectively connected to the live line L and the zero line N on the AC side of the AC-dc conversion module, and when the rectifying circuit works, AC 90-264 v voltage input L and N line AC sine wave voltages are rectified by the diodes D2 and D3, and the HV pin of the control chip IC1 is rectified to positive polarity voltage of M waveform.
In this embodiment, the intelligent self-bias power supply control circuit adaptively adjusts the maximum charging voltage of the capacitor C3 according to the set VDD pin voltage and the current consumed by the chip control circuit.
Specifically, the intelligent self-bias power supply control circuit comprises a switch SW1, a diode D5, a resistor R9, a UVLO (under-voltage locking) module, an LDO (linear voltage stabilizing) module and a self-power closed-loop control circuit, wherein an output voltage signal of the LDO module is used for controlling the self-power closed-loop control circuit to be started or closed. The self-powered closed-loop control circuit comprises voltage dividing resistors R4 and R5, an error amplifier EA1, a filter loop resistor R8 and a capacitor C8, a comparator CMP1 and voltage dividing resistors R6 and R7. The connection relation of the components of the intelligent self-bias power supply control circuit is shown in figure 3.
In this embodiment, the switch SW1 is turned on at a low level, and turned off at a high level. The switch SW1 includes MOS transistors M9, M10, M11, M12, M13, resistors R10, R11, R12, R13, and zener diodes ZD5 and ZD6, and the connection relationship of the components is shown in fig. 5. The MOS transistor M9 is a normally-on switch, which may be an N-channel high-voltage JFET (junction field effect transistor with a withstand voltage of 400V or more) or a high-voltage Depletion MOSFET (Depletion MOSFET with a withstand voltage of 400V or more, whose turn-on voltage Vth is a negative voltage), for blocking the high voltage of the HV pin and generating a low voltage at the internal VS node. For example, M9 is a high voltage JFET with a pinch-off voltage of 20V, or M9 is a Depletion MOSFET with a turn-on voltage Vth of-20V, then the VS node voltage is 20V when the HV pin voltage is higher than 20V, and is equal to or lower than 20V when the HV pin voltage is equal to the HV pin voltage. When the input signal vctrl is at a low level, the MOS transistor M13 is turned off, the MOS transistor M12 is turned on by the VS voltage through the resistor R13, the MOS transistor M10 is turned on by the MOS transistor M10 gate end voltage pulled down through the resistor R12 after the MOS transistor M12 is turned on, after the MOS transistor M10 is turned on, the HV pin voltage reaches the output end HVs of the switch SW1 through the resistor M9, the resistor R10 and the MOS transistor M10, when the voltage of the resistor R10 is larger than the turn-on voltage Vth_m11 of the MOS transistor M11, the MOS transistor M11 is turned on to raise the gate end voltage of the MOS transistor M10 to limit the maximum current ICh, and the maximum current ICh is equal to Vth_m11/R10. For example vth_m11=1v, r10=20 ohms, ich=50ma. Zener diode ZD5 limits the maximum voltage between MOS transistor M12 gate-source to prevent damage, and zener diode ZD6 limits the maximum voltage between MOS transistor M10 gate-source to prevent damage. When the input signal vctrl is at a high level, the MOS transistor M13 is turned on to pull the voltage of the MOS transistor M12 gate low, then the MOS transistor M12 is turned off, and then the resistor R12 pulls the voltage of the MOS transistor M10 gate end high to turn off, and the path between HV and HVs is turned off, so that the vctrl is at a low level, the switch SW1 is turned on, the maximum on current is ICh, the vctrl is at a high level, and the switch SW1 is turned off.
When the AC input is connected with an AC power supply, the VDD voltage is 0, the UVLO module is in an under-voltage locking state, the output por is low level, the output AVDD of the LDO module is 0, and the self-powered closed-loop control circuit is in a closing state. The switch SW1 is turned on at a low level, the switch is turned off at a high level, the resistor R9 pulls the voltage of the control end vctrl of the switch SW1 to be at a low level, the switch SW1 is turned on, the M waveform voltage of the HV end charges the capacitor C3 through the switch SW1, the diode D5 and the VDD pin, the VDD voltage starts to rise, when the VDD voltage rises to be greater than the under-voltage locking voltage (for example, 8V) of the UVLO module, the output por of the UVLO module is at a high level, as shown in the intelligent self-bias power supply starting time chart of FIG. 6, when the por output is at a high level, the LDO linear voltage stabilizing module outputs the AVDD to start to have the power supply voltage, the self-powered closed loop control circuit starts to work, meanwhile, the control circuit of the IC1 also starts to work, the flyback power supply system starts to work, and the control circuit is powered by the capacitor C3 externally connected by the VDD pin. When the voltage of the VDD voltage after being divided by the voltage dividing resistor R4/R5 is smaller than the reference voltage VREF, the output voltage Vea of EA1 increases, the vcomp voltage after being passed through the filter loop R8/C8 gradually increases, when the voltage of HV pin voltage after being divided by the voltage dividing resistor R6/R7 is smaller than the vcomp voltage, the output vctrl of the comparator CMP1 is low level, the switch SW1 conducts the HV pin voltage after being passed through the switch SW1, The diode D5 charges the capacitor C3, the VDD voltage starts to rise, when the voltage of the HV pin is higher than vcomp voltage through the voltage division voltage hv_div of the voltage division resistor R6/R7, the comparator outputs vctrl to be high level, the switch SW1 is closed, the HV pin stops charging the VDD pin external capacitor C3, at the moment, the VDD voltage slowly drops until the waveform voltage of the HV pin M is lower than vcomp voltage through the voltage division voltage hv_div of the resistor R6/R7, the comparator CMP1 outputs low level, the switch SW1 is conducted, the HV pin voltage is conducted through the switch SW1, the diode D2 charges the VDD pin external capacitor C3, and the VDD voltage starts to rise. Since the voltage divided by VDD through the voltage dividing resistor R4/R5 is lower than the reference voltage VREF, the error amplifier output voltage increases, and the vcomp voltage after R8/C8 filtering also increases, and therefore the time for which the comparator CMP1 output vctrl is at a low level also increases, and the on time of the switch SW1 increases, the charging time to the VDD external capacitor C3 also increases, and the VDD voltage continuously rises. When the VDD voltage increases to the set voltage (r4+r5)/r5×vref, at this time, the voltage obtained by dividing the VDD voltage by the dividing resistor R4/R5 is equal to the reference voltage VREF, the output voltage Vea of the error amplifier EA1 is not increased any more, the vcomp voltage obtained by filtering by R8/C8 is not increased any more, the self-powered closed-loop control circuit enters a stable state, at this time, the vcomp voltage is a stable voltage, each M waveform of the HV pin is turned on by the switch SW1, the charging time of the diode D2 to the capacitor C3 is also a fixed time, that is, the average charging current of the HV pin voltage to the capacitor C3 is equal to the consumption current of the IC1 control circuit, and the VDD voltage is in the set stable voltage (r4+r5)/r5×vref state. For example, if (r4+r5)/r5=5 and vref=2v are set, the VDD stable voltage is 10V. For stable operation of the self-powered closed loop control loop, the time constant of the filter loop R8 x C8 can be set to 5-10 times Ts, for example, 5 times Ts time constant R8 x c8=50ms, and meanwhile, the amplification factor of the error amplifier EA1 is not too large, and the amplification factor of EA1 can be set to 30-100 times, for example, 50 times.
When the loop enters a stable state, vcomp is a stable voltage, as shown in the following waveform diagram of the intelligent self-bias power supply at steady state moment in fig. 7, assuming that the AC input effective value voltage is Vrms and the period is Ts, the formula of the AC input voltage Vac over time t is as follows:
For example, if the frequency of the alternating current used daily is 220V, which is 50Hz, vrms=220v, ts=20ms;
The formula for the HV pin voltage over time t is therefore as follows:
in fig. 7, at time t0, vhv_t0=0, time t1 vhv_t1 is VDD set voltage vreg= (1+r4/R5) ×vref, and time t2 vhv_t2 is the maximum HV charge voltage, which is the voltage at which the HV voltage just exits from charging capacitor C3
Wherein the method comprises the steps of
From the two formulas above, it can be derived:
Vhv_t2= (1+r6/R7) ×vcomp when the loop is operating stably, thus
The current Iload consumed by the chip control circuit connected with the power stage circuit is the average current of the HV pin voltage charging current in half an M waveform Ts/4 period, that is, the current Iload consumed by the chip control circuit is an intelligent self-bias power supply load current, and the current when the HV pin charges the capacitor C3 is assumed to be Ich, so that:
Wherein the method comprises the steps of The Ich, R6, R7, R4, R5, vrms and VREF are all fixed values, and the proportional relation between the current Iload consumed by the control circuit and the vcomp voltage can be obtained from the above formula, namely, the greater the Iload current is, the higher the vcomp voltage is, the smaller the Iload current is, the lower the vcomp voltage is, the automatic adjustment of the HV maximum charging voltage is realized by the loop closed-loop control self-adaptive adjustment of the vcomp voltage according to the set VDD voltage and the consumption current of the chip control circuit, and the optimal power consumption control is realized.
Example 2
Unlike embodiment 1, the maximum charging voltage provided by the intelligent self-bias power supply control circuit to the storage capacitor C3 is fixed.
The intelligent self-bias power supply control circuit comprises a switch SW21, a diode D22, a resistor R25, a UVLO module, an LDO module and a self-power closed-loop control circuit, wherein the self-power closed-loop control circuit comprises voltage dividing resistors R21 and R22, a comparator CMP20, a comparator CMP21, a OR20 and voltage dividing resistors R23 and R24, and the connection relation of the components is shown in FIG. 8. The switch SW21 is turned on when the control terminal is at a low level, and turned off when the control terminal is at a high level, and the specific circuit structure may be the switch circuit structure shown in fig. 5.
Example 3
Unlike embodiment 1, the intelligent self-bias power supply control circuit sets a fixed charging time after the HV pin voltage crosses zero to power the storage capacitor C3.
The intelligent self-bias power supply control circuit comprises a switch SW31, a diode D32, a resistor R25, a UVLO module, an LDO module and a self-power closed-loop control circuit, wherein the self-power closed-loop control circuit comprises voltage dividing resistors R31 and R32, a comparator CMP30, an OR20, a timing unit, a zero crossing detection module and voltage dividing resistors R23 and R24, and the connection relation of the components is shown in figure 9. The switch SW31 is turned on when the control terminal is at a low level, and turned off when the control terminal is at a high level, and the specific circuit structure may be the switch circuit structure shown in fig. 5.
Example 4
Unlike in example 1, the rectifying circuit has only one diode D41, the negative electrode of which is connected to the HV pin, and the positive electrode of which is connected to the live or neutral line of the ac side of the ac-dc module. Fig. 10 shows a case where the positive electrode of the diode D41 is connected to the live line L on the ac side of the ac-dc conversion module.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
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| CN116995941A (en) * | 2022-04-26 | 2023-11-03 | 深圳英集芯科技股份有限公司 | Power supply circuit of switching power supply, power supply method of power supply circuit and switching power supply system |
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| CN120582470A (en) | 2025-09-02 |
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