CN211046770U - Power supply circuit and electronic equipment - Google Patents
Power supply circuit and electronic equipment Download PDFInfo
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- CN211046770U CN211046770U CN201922139840.7U CN201922139840U CN211046770U CN 211046770 U CN211046770 U CN 211046770U CN 201922139840 U CN201922139840 U CN 201922139840U CN 211046770 U CN211046770 U CN 211046770U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The embodiment of the utility model provides a power supply circuit and electronic equipment is provided in the field of power. Wherein, power supply circuit includes: the switching power supply comprises a node, a first switching circuit and a second switching circuit, wherein the node is used for converting alternating current commercial power into first output voltage and outputting the first output voltage at the node; the low dropout regulator is electrically connected to the node and is used for converting the first output voltage into a second output voltage; the controller is electrically connected with the low dropout regulator and is used for working according to the second output voltage; and a bias circuit, electrically connected to the node and electrically connected to the controller, for biasing the voltage of the node at a third output voltage in response to a standby signal sent by the controller when the power circuit operates in a standby state, wherein the third output voltage is smaller than the first output voltage. The embodiment of the utility model provides a power supply circuit's stand-by power consumption has been reduced.
Description
[ technical field ] A method for producing a semiconductor device
The embodiment of the utility model provides a relate to the power field, especially relate to a power supply circuit and electronic equipment.
[ background of the invention ]
The existing power circuit comprises a switching power supply, a low dropout regulator and a controller, wherein the switching power supply is used for converting alternating current mains supply into first output voltage, and the low dropout regulator is respectively electrically connected with the switching power supply and the controller and is used for converting the first output voltage into second output voltage so as to provide power for the controller. However, when the power circuit is in a standby state, the low dropout regulator consumes standby power, which is equal to (the first output voltage-the second output voltage) standby current, and the standby power of the power circuit is larger due to a larger difference between the first output voltage and the second output voltage.
[ Utility model ] content
An embodiment of the utility model aims at providing a power supply circuit and electronic equipment, it can reduce stand-by power consumption.
In order to solve the above technical problem, an embodiment of the present invention provides the following technical solution:
an embodiment of the utility model provides a power supply circuit, include:
the switching power supply comprises a node, a first switching circuit and a second switching circuit, wherein the node is used for converting alternating current commercial power into first output voltage and outputting the first output voltage at the node;
the low dropout regulator is electrically connected to the node and is used for converting the first output voltage into a second output voltage;
the controller is electrically connected with the low dropout regulator and is used for working according to the second output voltage; and
and the bias circuit is electrically connected with the node and is also electrically connected with the controller and used for responding to a standby signal sent by the controller when the power supply circuit works in a standby state and biasing the voltage of the node at a third output voltage, wherein the third output voltage is less than the first output voltage.
Optionally, the bias circuit comprises:
the switch circuit is electrically connected with the node and the controller and is used for working in a conducting state according to a standby signal sent by the controller;
and the impedance circuit is respectively electrically connected with the switching circuit and the switching power supply and is used for biasing the voltage of the node at a third output voltage when the switching circuit works in a conducting state.
Optionally, the switching circuit comprises a first band-stop transistor and a second band-stop transistor;
the base electrode of the first band-resistance triode is connected with the controller, the emitting electrode of the first band-resistance triode is connected with the switching power supply, and the collecting electrode of the first band-resistance triode is connected with the collecting electrode of the second band-resistance triode; and the emitting electrode of the second band-elimination triode is connected with the switching power supply, and the collector electrode of the second band-elimination triode is connected with the impedance circuit.
Optionally, the impedance circuit includes a first resistor, one end of the first resistor is connected to the collector of the second band-stop transistor, and the other end of the first resistor is connected to the switching power supply.
Optionally, the switching power supply comprises:
the rectification filter circuit is used for carrying out rectification filter processing on the alternating current commercial power;
the switch control circuit is electrically connected with the rectification filter circuit and is used for carrying out pulse width modulation on the voltage signal subjected to rectification filtering processing;
the voltage transformation circuit comprises a first primary coil, a second primary coil and a secondary coil, the first primary coil and the second primary coil are electrically connected with the switch control circuit, and the voltage transformation circuit is used for carrying out voltage reduction processing on a voltage signal after pulse width modulation;
and the feedback circuit is electrically connected with the node, is also electrically connected with the secondary coil, the bias circuit and the switch control circuit, and is used for outputting a feedback voltage to the switch control circuit according to the voltage of the node so as to adjust the duty ratio of a pulse width modulation signal of the switch control circuit.
Optionally, the switch control circuit comprises:
the first absorption circuit is respectively electrically connected with the rectification filter circuit and the first primary coil and is used for absorbing peak voltage generated by leakage inductance of the first primary coil;
the power supply chip is electrically connected with the first absorption circuit and is used for carrying out pulse width modulation on the voltage signal output by the first absorption circuit;
the second absorption circuit is electrically connected between the power supply chip and the second primary coil and is used for absorbing the peak voltage reflected to the power supply chip by the leakage inductance of the second primary coil;
and the first filter circuit is electrically connected between the power supply chip and the feedback circuit and is used for filtering the feedback voltage.
Optionally, the switching power supply further includes:
a protection circuit for suppressing a surge voltage;
and the second filter circuit is respectively electrically connected with the protection circuit and the rectification filter circuit and is used for filtering the alternating current commercial power.
Optionally, the switching power supply further includes a third filter circuit, where the third filter circuit is electrically connected to the secondary winding and is configured to filter the voltage inductively output by the secondary winding.
Optionally, the switching power supply further includes a third absorption circuit, electrically connected between the secondary winding and the third filter circuit, for absorbing a spike voltage of the output voltage of the secondary winding.
The embodiment of the utility model provides an electronic equipment is still provided, include as above arbitrary any power supply circuit.
The utility model has the advantages that: compared with the prior art, the embodiment of the utility model provides a power supply circuit and electronic equipment is provided. The node is electrically connected with the low dropout regulator through a bias circuit and outputs a first output voltage, the low dropout regulator outputs a second output voltage, and the bias circuit is also electrically connected with the controller and is used for responding to a standby signal sent by the controller when the power circuit works in a standby state and biasing the voltage of the node at a third output voltage, wherein the third output voltage is less than the first output voltage. Therefore, the embodiment of the utility model provides a through the bias circuit with the voltage bias of node at third output voltage, third output voltage is less than first output voltage to the voltage of node and second output voltage's difference have been reduced, and then power supply circuit's stand-by power consumption has been reduced.
[ description of the drawings ]
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a power circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power circuit according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a switching power supply according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a switch control circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a switching power supply according to another embodiment of the present invention;
fig. 6 is a schematic circuit connection diagram of a power circuit according to an embodiment of the present invention.
[ detailed description ] embodiments
To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model provides an electronic equipment, including following arbitrary circuit embodiment power supply circuit.
It can be understood that the electronic device is used as a power-consuming device, and consumes power during normal operation or standby of the electronic device, and the power circuit refers to a circuit design of a power supply part for supplying power to the electronic device. The embodiment of the utility model provides a pass through power supply circuit has reduced electronic equipment's stand-by power consumption.
The electronic equipment is an electrical equipment composed of microelectronic devices, and comprises an electronic computer, a robot controlled by the electronic computer, a numerical control or program control system and the like, such as a refrigerator, an air conditioner, an electric fan, a microwave oven, an electric cooker, an electric hair drier, an electric blanket, a stirrer, a juice extractor, a soybean milk maker, a washing machine, a dust collector, a sweeping robot, an electric shaver, a computer, a television, a camera, a printer, a facsimile machine, an all-in-one machine and the like.
Fig. 1 is a schematic structural diagram of a power circuit according to an embodiment of the present invention. As shown in fig. 1, the power supply circuit 100 includes a switching power supply 10, a low dropout regulator 20, a controller 30, and a bias circuit 40.
The switching power supply 10 includes a node a, and is configured to convert ac mains power into a first output voltage, and output the first output voltage at the node a.
The embodiment of the present invention is directed to a switching power supply 10, which is a high-frequency power conversion device, and is a power supply, and the function of the switching power supply 10 is to convert a level voltage into a voltage or a current required by a user end (an electronic device) through different types of architectures, wherein the input of the switching power supply 10 is mostly an AC power supply (e.g., a commercial power) or a dc power supply, the output of the switching power supply 10 is connected to the electronic device, and mostly used for providing a dc power supply for the electronic device, as shown in fig. 5, the switching power supply 10 inputs an AC commercial power 220VAC/50Hz and outputs a dc voltage +12V, and the AC commercial power 220/50 Hz is input from between a live wire AC L and a neutral wire ACN, and outputs the dc voltage +12V at a node a as the input of the low-voltage linear regulator 20.
Referring to fig. 3 and fig. 6, the switching power supply 10 includes a rectifying and filtering circuit 101, a switching control circuit 102, a transforming circuit 103, and a feedback circuit 104.
The rectification filter circuit 101 is used for performing rectification filtering processing on the alternating current commercial power.
The rectifying and filtering circuit 101 comprises a rectifying bridge BD1, a capacitor C1, an inductor L1, a capacitor C2., a first alternating current input end of the rectifying bridge BD1 is connected with a zero line ACN, a second alternating current input end of the rectifying bridge BD1 is connected with a live line AC L, a first direct current output end of the rectifying bridge BD1 is connected with the positive electrode of the capacitor C1 and one end of the inductor L1, a second direct current output end of the rectifying bridge BD1 is grounded, the negative electrode of the capacitor C1 is grounded with the negative electrode of the capacitor C2, and the other end of the inductor L1 is connected with the positive electrode of the capacitor C2.
It can be understood that the rectifier bridge BD1 forms a rectifier circuit for converting the ac mains power into dc power and outputting the dc power, and the capacitor C1, the inductor L1 and the capacitor C2 form a pi-type filter, the input and output of which are low impedance, for removing the harmonic component of the dc voltage signal output by the rectifier bridge BD1, so that the voltage signal input to the switch control circuit 102 is smoother.
The switch control circuit 102 is electrically connected to the rectifying and filtering circuit 101, and is configured to perform pulse width modulation on the voltage signal subjected to the rectifying and filtering processing.
The pulse width modulation is an analog control manner, and modulates the bias of the base electrode of the transistor or the gate of the MOS transistor in the power supply chip 1022 according to the change of the corresponding load to change the conduction time of the transistor or the MOS transistor, so as to change the output of the switching regulator, so that the output voltage of the switching regulator 10 is kept constant when the working condition changes.
Referring to fig. 4, the switch control circuit 102 includes a first sinking circuit 1021, a power chip 1022, a second sinking circuit 1023, and a first filter circuit 1024.
The first absorption circuit 1021 is electrically connected to the rectifying and filtering circuit 101 and the first primary coil 1031, and is configured to absorb a peak voltage generated by a leakage inductance of the first primary coil 1031.
As shown in fig. 6, the first sinking circuit 1021 includes a resistor R6, a capacitor C3, and a diode D1.
One end of the resistor R6 is connected to the other end of the inductor L1, the anode of the capacitor C2, one end of the capacitor C3, and one end of the first primary winding 1031, the other end of the resistor R6 is connected to the other end of the capacitor C3 and the cathode of the diode D1, and the anode of the diode D1 is connected to the power chip U1 and the other end of the first primary winding 1031.
The voltage signal output from the first sinking circuit 1021 is pulse-width modulated by controlling the on and off of the switching device in the power chip U1 to maintain a stable output voltage. When the switching device is turned off, the energy stored in the parasitic inductance is charged by the parasitic capacitance of the switching device, the voltage of the switching device rises, and when the voltage of the switching device rises to the voltage of the capacitor C3, the diode D1 is turned on, and the voltage of the switching device is clamped by the diode D1. The energy accumulated in the parasitic inductance also charges the capacitor C3. During the on-time of the switching device, the capacitor C3 discharges through the resistor R6. Thus, the first sinking circuit 1021 reduces a spike voltage (i.e., an overvoltage) formed on the switching device by the leakage inductance of the first primary winding 1031. In addition, the first sinking circuit 1021 can also be used to reduce electromagnetic interference.
In some embodiments, the switch control circuit 102 further includes an input filter circuit including a capacitor C12 and a capacitor C13, and the output voltage + HV of the first primary coil 1031 is coupled to ground via the capacitor C12 and the capacitor C13, which are connected in series.
The power chip 1022 is electrically connected to the first sinking circuit 1021, and is configured to perform pulse width modulation on the voltage signal output by the first sinking circuit 1021.
Wherein the power chip 1022 includes a power chip U1. The power chip U1 can select the power chip SC1117DG, and the power chip SC1117DG includes a trigger pin D, a bypass pin FB, a feedback pin BP and four source pins S; the trigger pin D is connected to the anode of the diode D1 and the other end of the first primary coil 1031; the bypass pin FB is connected with one end of a secondary side of the optocoupler U3; the feedback pin BP is connected with the other end of the secondary side of the optocoupler U3; the four source pins S are all grounded.
The second absorption circuit 1023 is electrically connected between the power chip 1022 and the second primary coil 1032, and is configured to absorb a peak voltage reflected to the power chip 1022 by a leakage inductance of the second primary coil 1032.
The second sinking circuit 1023 includes a diode D2, a capacitor C4, and a resistor R7. An anode of the diode D2 is connected to one end of the second primary coil 1032, and a cathode of the diode D2 is connected to one end of the capacitor C4 and one end of the resistor R7; the other end of the capacitor C4 and the other end of the second primary coil 1032 are both grounded; the other end of the resistor R7 is connected to the feedback pin BP.
The first filter circuit 1024 is electrically connected between the power chip 1022 and the feedback circuit 104, and is configured to filter the feedback voltage.
The first filter circuit 1024 includes a capacitor C5, one end of the capacitor C5 is connected to the feedback pin BP, and the other end of the capacitor C5 is grounded.
The transformation circuit 103 includes a first primary coil 1031, a second primary coil 1032 and a secondary coil 1033, the first primary coil 1031 and the second primary coil 1031 are both electrically connected to the switch control circuit 102, and the transformation circuit 103 is configured to perform voltage reduction processing on the voltage signal after pulse width modulation.
The transformer circuit 103 includes a transformer T1, the transformer T1 includes a first primary coil 1031, a second primary coil 1032, a secondary coil 1033, and a magnetic core, the first primary coil 1031 and the second primary coil 1032 are located on the magnetic primary side, and the secondary coil 1033 is located on the secondary side of the magnetic core. In the present embodiment, the core is a power ferrite core of EE16 type.
The feedback circuit 104 is electrically connected to the node a, and is further electrically connected to the secondary winding 1033, the bias circuit 40, and the switch control circuit 102, for outputting a feedback voltage to the switch control circuit 102 according to the voltage at the node a, so as to adjust the duty ratio of the pulse width modulation signal of the switch control circuit 102.
The feedback circuit 104 comprises a capacitor C6, a resistor R8, a resistor R9, a capacitor C7, a resistor R10, a controllable precision voltage regulator U2, a resistor R11, a resistor R12 and an optocoupler U3.
One end of the capacitor C6 is electrically connected to the node a, and the other end of the capacitor C6 is connected to one end of the resistor R9, the anode of the controllable precision voltage regulator U2 and the bias circuit 40; one end of the resistor R8 is electrically connected to the node a, and the other end of the resistor R8 is connected with the other end of the resistor R9, one end of the capacitor C7 and a reference electrode of the controllable precision voltage-stabilizing source U2; the other end of the capacitor C7 is connected with one end of the resistor R10; the other end of the resistor R10 is connected with the cathode of the controllable precise voltage-stabilizing source U2, one end of the resistor R12 and one end of the primary side of the optocoupler U3; one end of the resistor R11 is connected with one end of the secondary coil 1033, and the other end of the resistor R11 is connected with the other end of the resistor R12 and the other end of the primary side of the optocoupler U3; one end of a secondary side of the optocoupler U3 is connected with the bypass pin FB, and the other end of the secondary side of the optocoupler U3 is connected with the feedback pin BP, the other end of the resistor R7 and one end of the capacitor C5.
In the present embodiment, the controllable precision voltage regulator U2 adopts a controllable precision voltage regulator T L431.
In some embodiments, referring to fig. 5, the switching power supply 10 further includes at least one of a protection circuit 105, a second filter circuit 106, a third filter circuit 107, and a third absorption circuit 108.
The protection circuit 105 is used to suppress surge voltage.
The protection circuit 105 comprises a voltage dependent resistor RN1 and a resistor R13, wherein the voltage dependent resistor RN1 is connected between a live line AC L and a neutral line ACN in parallel, the resistor R13 is connected on the live line AC L in series, when the voltage at two ends of the voltage dependent resistor RN1 exceeds the voltage threshold value of the voltage dependent resistor RN L, the voltage dependent resistor RN1 breaks down and conducts, and the live line AC L, the resistor R13, the voltage dependent resistor RN1 and the neutral line CAN form a loop, so that the overvoltage protection function is achieved.
The second filter circuit 106 is electrically connected to the protection circuit 105 and the rectification filter circuit 101, and is configured to filter the ac mains.
The second filter circuit 106 comprises a capacitor C8, a resistor R14 and a resistor R15, wherein the resistor R14 and the resistor R15 are connected in series and then connected in parallel with the capacitor C8, and the capacitor C8 is connected in parallel between the live line AC L and the neutral line ACN.
The third filter circuit 107 is electrically connected to the secondary winding 1033, and is configured to filter the voltage induced and output by the secondary winding 1033.
The third filter circuit 107 comprises a capacitor C9, an inductor L2 and a capacitor C10, wherein the positive electrode of the capacitor C9 is connected with one end of the secondary coil 1033 and one end of the inductor L2, the negative electrode of the capacitor C9 and the other end of the secondary coil 1033 are both grounded, the intersection point of the other end of the inductor L2 and the positive electrode of the capacitor C10 is a node a, and the negative electrode of the capacitor C10 is grounded.
It is understood that the capacitor C9, the inductor L2 and the capacitor C10 form a pi-type filter for filtering the voltage induced and outputted by the secondary winding 1033 to obtain the first output voltage, in some embodiments, the inductor L2 may be replaced by a resistor to reduce the size and cost of the power circuit 100.
The third absorption circuit 108 is electrically connected between the secondary winding 1033 and the third filter circuit 107, and is configured to absorb a spike voltage of the output voltage of the secondary winding 1033.
The third absorption circuit 108 includes a capacitor C11, a resistor R16, and a diode D3, one end of the capacitor C11 is connected to one end of the secondary winding 1033 and the anode of the diode D3, the other end of the capacitor C11 is connected to one end of the resistor R16, and the other end of the resistor R16 is connected to the cathode of the diode D3, the anode of the capacitor C9, and one end of the inductor L2.
It can be understood that the larger the power of the power supply circuit 100, the larger the loss of the resistor R16, so the smaller the value of the resistor R16, the better. The diode D3 adopts a fast recovery or ultra-fast recovery diode to reduce the heat generation of the diode D3.
The low dropout regulator 20 is electrically connected to the node a, and is configured to convert the first output voltage into a second output voltage.
The LDO 20 includes a LDO U4. The low dropout regulator U4 comprises an input pin Vi n, an output pin Vout and a ground pin GND, wherein the input pin Vi n is connected with the node a and is used for receiving the voltage output by the node a; the output pin Vout is configured to output the second output voltage, and the second output voltage is used to provide power for the controller 30; the ground pin GND is grounded.
The controller 30 is electrically connected to the low dropout regulator 20, and is configured to operate according to the second output voltage.
In this embodiment, the controller 30 includes a single chip microcomputer (not shown) and its peripheral circuits, and the single chip microcomputer may adopt 51 series, Ardui no series, STM32 series, and the like.
In some embodiments, the controller 30 may also be a general purpose processor, a Digital Signal Processor (DSP), an application specific integrated circuit (ASI C), a Field Programmable Gate Array (FPGA), an arm (acorn RI SC machine), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components; but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine; or as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The bias circuit 40 is electrically connected to the node a and is further electrically connected to the controller 30, and configured to bias the voltage of the node a at a third output voltage in response to a standby signal sent by the controller 30 when the power circuit 100 operates in a standby state, where the third output voltage is smaller than the first output voltage.
Referring to fig. 2, the bias circuit 40 includes a switch circuit 401 and an impedance circuit 402.
The switch circuit 401 is electrically connected to the node a and is also electrically connected to the controller 30, and is configured to operate in a conducting state according to a standby signal sent by the controller 30.
The switching circuit 401 comprises a first band-stop triode Q1 and a second band-stop triode Q2, the base electrode of the first band-stop triode Q1 is connected with the controller 30, the emitter electrode of the first band-stop triode Q1 is connected with the switching power supply 10, and the collector electrode of the first band-stop triode Q1 is connected with the collector electrode of the second band-stop triode Q2; the emitter of the second band-stop transistor Q2 is connected to the switching power supply 10, and the collector of the second band-stop transistor Q2 is connected to the impedance circuit 402.
In this embodiment, the first band-stop transistor Q1 includes a resistor R1, an NPN transistor Q11, and a resistor R2, and the second band-stop transistor Q2 includes a resistor R3, a PNP transistor Q21, and a resistor R4.
One end of the resistor R1 is connected to the controller 30, and the other end of the resistor R1 is connected to the base of the NPN transistor Q11 and one end of the resistor R2; an emitter of the NPN triode Q11 is connected to the other end of the resistor R2 and the switching power supply 10 (the other end of the capacitor C6, one end of the resistor R9 and an anode of the controllable precision voltage regulator U2), and a collector of the NPN triode Q11 is connected to one end of the resistor R3; the other end of the resistor R3 is connected with the base of the PNP triode Q21 and one end of the resistor R4; the emitter of the PNP transistor Q21 is connected to the other end of the resistor R4 and the node a, and the collector of the PNP transistor Q21 is connected to the impedance circuit 402.
The impedance circuit 402 is electrically connected to the switch circuit 401 and the switching power supply 10, respectively, and is configured to bias the voltage at the node a to a third output voltage when the switch circuit 401 operates in a conducting state.
The impedance circuit 401 includes a first resistor R5, one end of the first resistor R5 is connected to the collector of the second band-elimination transistor Q2, and the other end of the first resistor R5 is connected to the switching power supply 10 (the other end of the resistor R8, the other end of the resistor R9, one end of the capacitor C7, and the reference electrode of the controllable precise voltage-regulator U2).
When the I O port of the controller 30 sends a low level signal to the first band-resistance triode Q1, the low level signal reaches the base of the NPN triode Q11 after being divided by the resistor R1 and the resistor R2, the on condition of the NPN triode Q11 is not satisfied, the NPN triode Q11 is turned off, at this time, the collector voltage of the NPN triode Q11 is high level, the on condition of the PNP triode Q21 is not satisfied, the PNP triode Q21 is turned off, the first resistor R5 does not participate in voltage division, that is, the bias circuit 40 does not work. At this time, the feedback voltage Vfb of the controllable precision voltage regulator U2 is R9/(R8+ R9) × Vref, where Vref is the reference voltage of the controllable precision voltage regulator U2, and the power chip U1 adjusts the duty ratio of the pulse width modulation signal of the switch control circuit 102 according to the feedback voltage Vfb of the controllable precision voltage regulator U2 to control the voltage coupled to the secondary winding 1033, so that the node a outputs a first output voltage, for example, 12V.
When the IO port of the controller 30 sends a high level signal to the first band-resistance triode Q1, the high level signal reaches the base of the NPN triode Q11 after being divided by the resistor R1 and the resistor R2, so as to satisfy the conduction condition of the NPN triode Q11, the NPN triode Q11 is turned on, at this time, the collector voltage of the NPN triode Q11 is pulled low, and reaches the base of the PNP triode Q21 after being divided by the resistor R3 and the resistor R4, the emitter voltage of the PNP triode Q21 is equal to the voltage of the node a, so as to satisfy the conduction condition of the PNP triode Q21, the PNP triode Q21 is turned on, and the first resistor R5 participates in voltage division, that is, the bias circuit 40 operates. At this time, the feedback voltage Vfb of the controllable precision regulated power supply U2 is R9/(R8+ R9// R5) × Vref, where R9// R5 denotes that a resistor R9 is connected in parallel with a first resistor R5, and the power chip U1 adjusts the duty ratio of the pulse width modulation signal of the switching control circuit 102 according to the feedback voltage Vfb of the controllable precision regulated power supply U2 to control the voltage coupled to the secondary winding 1033, so as to bias the voltage of the node a at a third output voltage, which is less than the first output voltage, for example, 7V.
To sum up, when the power supply circuit 100 is in the standby state, if the controller 30 does not control the bias circuit 40 to operate, assuming that the standby current of the power supply circuit 100 is i, the standby power P consumed by the low dropout linear regulator U4 is (first output voltage — second output voltage) ═ i ═ 12-5) ═ i ═ 7 i; if the controller 30 controls the bias circuit 40 to operate, and assuming that the standby current of the power supply circuit 100 is i, the standby power P consumed by the low dropout linear regulator U4 is (third output voltage — second output voltage) × i is (7-5) × i is 2i, so that the standby power P consumed by the low dropout linear regulator U4 can be reduced by the bias circuit 40, thereby reducing the standby power of the power supply circuit 100.
In some embodiments, the power circuit 200 further includes an output filter circuit for filtering the second output voltage.
As shown in fig. 6, the output filter circuit includes a capacitor C14 and a capacitor C15. The anode of the capacitor C14 is connected to the output pin Vout of the low dropout linear regulator U4 and one end of the capacitor C15, and the cathode of the capacitor C14 and the other end of the capacitor C15 are both grounded.
The embodiment of the utility model provides a power supply circuit is connected the node at switching power supply through biasing circuit and low dropout linear regulator electricity, the first output voltage of node output, low dropout linear regulator output second output voltage to, biasing circuit still is connected with the controller electricity, be used for when power supply circuit work is when standby state, respond to the standby signal that the controller sent, with the voltage bias of node at third output voltage, wherein, third output voltage is less than first output voltage. Therefore, the embodiment of the utility model provides a through the bias circuit with the voltage bias of node at third output voltage, third output voltage is less than first output voltage to the voltage of node and second output voltage's difference have been reduced, and then power supply circuit's stand-by power consumption has been reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A power supply circuit, comprising:
the switching power supply comprises a node, a first switching circuit and a second switching circuit, wherein the node is used for converting alternating current commercial power into first output voltage and outputting the first output voltage at the node;
the low dropout regulator is electrically connected to the node and is used for converting the first output voltage into a second output voltage;
the controller is electrically connected with the low dropout regulator and is used for working according to the second output voltage; and
and the bias circuit is electrically connected with the node and is also electrically connected with the controller and used for responding to a standby signal sent by the controller when the power supply circuit works in a standby state and biasing the voltage of the node at a third output voltage, wherein the third output voltage is less than the first output voltage.
2. The power supply circuit of claim 1, wherein the bias circuit comprises:
the switch circuit is electrically connected with the node and the controller and is used for working in a conducting state according to a standby signal sent by the controller;
and the impedance circuit is respectively electrically connected with the switching circuit and the switching power supply and is used for biasing the voltage of the node at a third output voltage when the switching circuit works in a conducting state.
3. The power supply circuit of claim 2, wherein the switching circuit comprises a first band-stop transistor and a second band-stop transistor;
the base electrode of the first band-resistance triode is connected with the controller, the emitting electrode of the first band-resistance triode is connected with the switching power supply, and the collecting electrode of the first band-resistance triode is connected with the collecting electrode of the second band-resistance triode; and the emitting electrode of the second band-elimination triode is connected with the switching power supply, and the collector electrode of the second band-elimination triode is connected with the impedance circuit.
4. The power supply circuit of claim 3, wherein the impedance circuit comprises a first resistor, one end of the first resistor is connected to the collector of the second band-stop transistor, and the other end of the first resistor is connected to the switching power supply.
5. The power supply circuit according to any one of claims 1 to 4, wherein the switching power supply includes:
the rectification filter circuit is used for carrying out rectification filter processing on the alternating current commercial power;
the switch control circuit is electrically connected with the rectification filter circuit and is used for carrying out pulse width modulation on the voltage signal subjected to rectification filtering processing;
the voltage transformation circuit comprises a first primary coil, a second primary coil and a secondary coil, the first primary coil and the second primary coil are electrically connected with the switch control circuit, and the voltage transformation circuit is used for carrying out voltage reduction processing on a voltage signal after pulse width modulation;
and the feedback circuit is electrically connected with the node, is also electrically connected with the secondary coil, the bias circuit and the switch control circuit, and is used for outputting a feedback voltage to the switch control circuit according to the voltage of the node so as to adjust the duty ratio of a pulse width modulation signal of the switch control circuit.
6. The power supply circuit according to claim 5, wherein the switch control circuit comprises:
the first absorption circuit is respectively electrically connected with the rectification filter circuit and the first primary coil and is used for absorbing peak voltage generated by leakage inductance of the first primary coil;
the power supply chip is electrically connected with the first absorption circuit and is used for carrying out pulse width modulation on the voltage signal output by the first absorption circuit;
the second absorption circuit is electrically connected between the power supply chip and the second primary coil and is used for absorbing the peak voltage reflected to the power supply chip by the leakage inductance of the second primary coil;
and the first filter circuit is electrically connected between the power supply chip and the feedback circuit and is used for filtering the feedback voltage.
7. The power supply circuit according to claim 5, wherein the switching power supply further comprises:
a protection circuit for suppressing a surge voltage;
and the second filter circuit is respectively electrically connected with the protection circuit and the rectification filter circuit and is used for filtering the alternating current commercial power.
8. The power supply circuit according to claim 5, wherein the switching power supply further comprises a third filter circuit electrically connected to the secondary winding for filtering the voltage induced and output by the secondary winding.
9. The power supply circuit according to claim 8, wherein the switching power supply further comprises a third absorption circuit electrically connected between the secondary winding and the third filter circuit, for absorbing a spike voltage of the output voltage of the secondary winding.
10. An electronic device, characterized in that it comprises a power supply circuit according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922139840.7U CN211046770U (en) | 2019-12-02 | 2019-12-02 | Power supply circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922139840.7U CN211046770U (en) | 2019-12-02 | 2019-12-02 | Power supply circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152487A (en) * | 2020-11-04 | 2020-12-29 | 珠海格力电器股份有限公司 | A switching power supply circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152487A (en) * | 2020-11-04 | 2020-12-29 | 珠海格力电器股份有限公司 | A switching power supply circuit and electronic equipment |
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