CN211508931U - Power supply identification conversion circuit and air conditioner - Google Patents
Power supply identification conversion circuit and air conditioner Download PDFInfo
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- CN211508931U CN211508931U CN202020553772.9U CN202020553772U CN211508931U CN 211508931 U CN211508931 U CN 211508931U CN 202020553772 U CN202020553772 U CN 202020553772U CN 211508931 U CN211508931 U CN 211508931U
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Abstract
The utility model provides a power discernment converting circuit and air conditioner. The power supply identification conversion circuit comprises: the rectifier filter circuit (1) converts input alternating current into direct current, and a switch (11) is arranged in the rectifier filter circuit (1); the detection control circuit (2) detects the voltage of the positive electrode of the output end of the rectification filter circuit (1), when the voltage is smaller than a preset value, the switch (11) is switched on, the rectification filter circuit (1) is a voltage-doubling rectification filter circuit, when the voltage is not smaller than the preset value, the switch (11) is switched off, and the rectification filter circuit (1) is a bridge-type rectification filter circuit. The working mode of the rectifying and filtering circuit is controlled by detecting the positive voltage of the output end and automatically switching, and the voltage-multiplying rectifying and filtering circuit and the bridge type rectifying and filtering circuit are integrated, so that the circuit is simple, easy to realize and cost is saved.
Description
Technical Field
The utility model relates to the technical field of circuits, specifically, relate to a power supply identification converting circuit and air conditioner.
Background
The existing air conditioner frequency conversion 220V external machine controller is incompatible with a circuit of a 110V external machine controller, a new controller is needed for some areas using a 110VAC 50/60Hz power supply, the processing period is long, the cost is high, and the controller is easy to burn out due to wrong voltage during internal test.
Disclosure of Invention
The utility model discloses a main aim at provides a power identification converting circuit and air conditioner, through the anodal voltage automatic switch-over accuse rectifier and filter circuit's of detection output mode to voltage doubling rectifier and filter circuit and bridge type rectifier and filter circuit integrate, the circuit is simple, realizes easily, and saved the cost.
An aspect of the utility model provides a power identification converting circuit, a serial communication port, the circuit includes: the rectifier filter circuit 1 is used for converting input alternating current into direct current, and a switch 11 is arranged in the rectifier filter circuit; the detection control circuit 2 detects the voltage of the positive electrode of the output end of the rectification filter circuit 1, when the voltage of the positive electrode of the output end is smaller than a preset value, the switch 11 is switched on, the rectification filter circuit 1 is a voltage-doubling rectification filter circuit, when the voltage of the positive electrode of the output end is not smaller than the preset value, the switch 11 is switched off, and the rectification filter circuit 1 is a bridge rectification filter circuit.
Therefore, the working mode of the rectifying and filtering circuit is controlled by detecting the positive voltage of the output end to automatically switch, so that when the input alternating current is 110V or 220V, the direct current output voltage is the same and can be universal, the voltage-multiplying rectifying and filtering circuit and the bridge type rectifying and filtering circuit are integrated, the circuit is simple, the implementation is easy, and the cost is saved.
Optionally, the rectifying and filtering circuit 1 further includes a rectifying circuit 12, where the rectifying circuit 12 is formed by connecting N rectifying bridges in parallel, where N is an integer greater than 1.
Therefore, the input alternating current is shunted, so that the rectifying circuit is resistant to large-current impact and high in circuit reliability.
Optionally, the rectifying and filtering circuit 1 further includes a filter circuit 13, the filter circuit 13 is formed by a capacitor CE1 and a capacitor CE2 connected in series, one end of the switch 11 is connected to the capacitor CE1 and the capacitor CE2, and the other end of the switch 11 is connected to the AC input end zero line AC _ N of the power supply identification conversion circuit.
Optionally, the detection control circuit 2 includes a voltage dividing circuit 21 and a control circuit 22, the voltage dividing circuit 21 divides the voltage at the positive electrode of the output end of the rectification filter circuit 1, and the control circuit 22 turns on or off the switch 11 according to the divided voltage.
Optionally, the voltage dividing circuit 21 includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2 connected in series, the other end of the first voltage dividing resistor R1 is connected to the positive electrode of the output terminal of the rectifying and filtering circuit 1, the other end of the second voltage dividing resistor R2 is connected to ground, and the control circuit 22 turns on or off the switch 11 according to the voltage across the second voltage dividing resistor R2.
Therefore, the magnitude of the input voltage is judged through the voltage dividing resistor, and the method is easy to realize and low in cost.
Optionally, the control circuit 22 is composed of a comparison circuit 22A and a transistor Q1, and the comparison circuit 22A controls the on/off of the transistor Q1 according to the voltage across the second voltage-dividing resistor R2 and the reference voltage, so as to turn on or off the switch 11.
Therefore, the switch is controlled by a pure hardware circuit, and the method is more accurate and fast.
Optionally, the control circuit 22 is composed of a single chip microcomputer and a peripheral circuit thereof, and the single chip microcomputer switches on or off the switch 11 according to the voltage of the second voltage-dividing resistor R2.
Optionally, the power identification and conversion circuit further includes a power supply system 3, an input end of the power supply system 3 is connected to an output end of the rectification filter circuit 1, and an output end of the power supply system 3 is connected to a power supply input end of the single chip microcomputer.
Therefore, the output end voltage of the power supply identification conversion circuit is used for providing working voltage for the single chip microcomputer, and cost is saved.
Optionally, a capacitor C3 is disposed between the input terminal of the control circuit 22 connected to the second voltage-dividing resistor R2 and ground.
Therefore, the voltage input into the control circuit is filtered, and the safety and the reliability are improved.
Optionally, the switch 11 is a relay.
Another aspect of the present invention provides an air conditioner, including the power identification conversion circuit described above.
The advantages of the air conditioner are the same as those of the power supply identification and conversion circuit, and the description is omitted here.
Drawings
Fig. 1 schematically illustrates a block diagram of a power identification conversion circuit according to an embodiment of the present invention;
fig. 2 schematically illustrates a schematic circuit diagram of a power identification conversion circuit according to an embodiment of the present invention;
fig. 3 schematically illustrates a schematic circuit diagram of a power identification conversion circuit according to another embodiment of the present invention.
Description of reference numerals:
1-a rectifying and filtering circuit; 11-a switch; 12-a rectifier circuit; 13-a filter circuit;
2-detecting a control circuit; 21-a voltage divider circuit; 22-a control circuit; 22A-a comparison circuit;
3-power supply system.
Detailed Description
In order to make the application objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
The first embodiment is as follows:
fig. 1 schematically shows a block diagram of a power identification conversion circuit provided by an embodiment of the present invention, and fig. 2 schematically shows a circuit schematic diagram of a power identification conversion circuit provided by an embodiment of the present invention. As shown in fig. 1, the power identification conversion circuit is composed of a rectification filter circuit 1 and a detection control circuit 2.
The rectifying and filtering circuit 1 converts the alternating current at the input end thereof into direct current. The detection control circuit 2 detects the voltage of the positive electrode of the output end of the rectification filter circuit 1. Taking the AC power at the input end of the rectifying and filtering circuit 1 as 110VAC and 220VAC as an example, when the AC power at the input end of the rectifying and filtering circuit 1 is 110V AC, the voltage of the positive pole of the output end is smaller than a preset value, at this time, the detection control circuit 2 switches on the switch 11 in the rectifying and filtering circuit, so that the rectifying and filtering circuit 1 becomes a voltage-doubling rectifying and filtering circuit, and the direct current output after the voltage-doubling rectifying and filtering circuit performs voltage-doubling rectification on the AC power of 110V AC is 310V DC; when the alternating current at the input end of the rectifying and filtering circuit 1 is 220VAC, the voltage of the positive electrode at the output end is larger than a preset value, at this time, the detection control circuit 2 disconnects the switch 11 in the rectifying and filtering circuit, so that the rectifying and filtering circuit 1 becomes a bridge rectifying and filtering circuit, and the direct current output after the bridge rectifying and filtering circuit rectifies the alternating current of 220V AC is 310V DC.
Referring to fig. 2, the rectifying-filtering circuit 1 is composed of a switch 11, a rectifying circuit 12, and a filtering circuit 13.
The rectifying circuit 12 is formed by connecting N rectifying bridges in parallel, where N is an integer greater than 1. Taking the rectifying circuit 12 as an example of the rectifying bridge DB1 in the double-rectifying-bridge parallel structure shown in fig. 2, the rectifying bridge DB1 is formed by sequentially connecting four diodes, the cathode of the diode D1 is connected to the cathode of the diode D2, the anode of the diode D2 is connected to the cathode of the diode D3, the anode of the diode D3 is connected to the anode of the diode D4, and the cathode of the diode D4 is connected to the anode of the diode D1, so that the rectifying bridge DB1 is formed. Further, the cathode of the diode D4 and the anode of the diode D1 are connected to the live AC _ L of the AC input terminal, the anode of the diode D2 and the cathode of the diode D3 are connected to the neutral AC _ N of the AC input terminal, the cathode of the diode D1 and the cathode of the diode D2 are connected to the positive DC + of the output terminal of the rectifying and smoothing circuit 1, and the anode of the diode D3 and the anode of the diode D4 are connected to the negative DC-of the output terminal of the rectifying and smoothing circuit 1. Other rectifier bridges DB2, rectifier bridges DB3, … …, and rectifier bridge DBN are connected in parallel with rectifier bridge DB1 in the same way as rectifier bridge DB1, and are not described herein again. The parallel rectifier bridge shunts the input alternating current, and the capacity of the rectifier circuit 12 for resisting large current impact is improved. It will be appreciated that the rectifier circuit 12 may also be composed of a single rectifier bridge, for example, the rectifier circuit 12 is formed only by the rectifier bridge DB 1. In this embodiment, a voltage dependent resistor ZNR may be further connected between the live line AC _ L of the AC input terminal and the null line AC _ N of the AC input terminal to limit the voltage input to the filter and rectifier circuit 1, and absorb the redundant current to protect the power identification and conversion circuit.
The filter circuit 13 is formed by connecting a capacitor CE1 and a capacitor CE2 in series, one end of the capacitor CE1, one end of the capacitor CE2 and one end of the switch 11 are connected together, the other end of the capacitor CE1 is connected to the positive pole DC + of the output end of the rectifying and filtering circuit 1, the other end of the capacitor CE2 is connected to the negative pole DC + of the output end of the rectifying and filtering circuit 1, and the other end of the switch 11 is connected to the zero line AC _ N of the alternating current input end of the power identification and conversion circuit.
The switch 11 is a relay K. The working principle of the rectifying and filtering circuit 1 is illustrated by a parallel structure of double rectifying bridges shown in fig. 2. The relay K is normally open, when alternating current U0 inputs the input end of the rectification filter circuit 1, the rectification bridge DB1 and the rectification bridge DB2 carry out parallel full-wave rectification on the alternating current U0, the capacitor CE1 and the capacitor CE2 carry out series filtering on direct current obtained after rectification, then filtered direct current is output through the output end of the rectification filter circuit 1, and at the moment, the voltage Vdc of the positive electrode of the output end of the rectification filter circuit 1 is 1.414U 0.
The detection control circuit 2 is composed of a voltage division circuit 21 and a control circuit 22, the voltage division circuit 21 divides the voltage on the positive electrode of the output end of the rectification filter circuit 1, and the control circuit 22 switches on or off the switch 11 according to the divided voltage. Taking the voltage dividing circuit 21 including the first voltage dividing resistor R1 and the second voltage dividing resistor R2 connected in series as an example to explain the operating principle of the detection control circuit 2, referring to fig. 2, the other end of the first voltage dividing resistor R1 is connected to the positive electrode of the output end of the rectifying and filtering circuit 1, the other end of the second voltage dividing resistor R2 is grounded, the control circuit 22 turns on or off the switch 11 according to the voltage Va across the second voltage dividing resistor R2, and the voltage Va across the second voltage dividing resistor R2 is Vdc R2/(R1+ R2).
The control circuit 22 is composed of a single chip Microcomputer (MCU) and peripheral circuits thereof, and at this time, the power identification and conversion circuit further includes a power system 3, an input end of the power system 3 is connected to an output end of the rectification and filtering circuit 1, and an output end of the power system 3 is connected to a power input end of the single chip microcomputer. The power supply system 3 converts the voltage at the output end of the rectifying and filtering circuit 1 into the voltage required by the work of the single chip microcomputer, and provides the converted voltage for the power supply input end of the single chip microcomputer, so that the single chip microcomputer works normally. A capacitor C3 is arranged between the input end of the second voltage-dividing resistor R2 in the single chip microcomputer and the ground, in the embodiment shown in fig. 2, a resistor R3 is connected between the single chip microcomputer and the second voltage-dividing resistor R2, and the ungrounded end of the capacitor C3 is connected with a resistor R3 and the input end of the single chip microcomputer connected with a resistor R3.
The working principle of the power supply identification conversion circuit is explained by taking the alternating current U0 at the input end as 110V and 220V. In this embodiment, when the control circuit 22 is composed of a single chip microcomputer, the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 need to be designed, so that when the alternating current U0 is 110V, the voltage Va across the second voltage-dividing resistor R2 is less than 4.5V, and when the alternating current U0 is 220V, the voltage Va across the second voltage-dividing resistor R2 is not less than 4.5V.
The relay K is normally open, when the input alternating current U0 is 110V, the voltage Vdc of the positive electrode of the output end of the rectifying and filtering circuit 1 is 1.414U0 or 155V DC, the voltage Va of the second voltage dividing resistor R2 is less than 4.5V, the level Va detected by the single chip microcomputer is low level, so that it is determined that the voltage of the positive electrode of the output end of the rectifying and filtering circuit 1 is less than a preset value (the preset value is 200V for example), the single chip microcomputer controls the relay K to pull in, so that the relay K is in a conducting state, the rectifying circuit 12 charges the capacitor CE1 in the positive half cycle of the input alternating current U0, charges the capacitor CE2 in the negative half cycle of the input alternating current U0, the voltages of the two ends of the capacitor CE 3682928 and the capacitor CE2 are both 155V DC, and the voltage of the output end of the rectifying and filtering circuit 1 is the sum of the voltages of the two ends of the. Since the zero line AC _ N of the alternating current input end is grounded, the voltage is 0, and after the relay K is closed, the voltage Vdc of the positive electrode of the output end of the rectifying and filtering circuit 1 is still +155V DC, and the voltage of the negative electrode of the output end of the rectifying and filtering circuit 1 is-155V DC, so that the error control of the single chip microcomputer can not be caused.
The relay K is normally open, when the input alternating current U0 is 220V, the positive voltage Vdc of the output end of the rectifying and filtering circuit 1 is 1.414U0 310V DC, the voltage Va on the second voltage dividing resistor R2 is greater than 4.5V, the level Va detected by the single chip microcomputer is high level, and therefore it is judged that the positive voltage of the output end of the rectifying and filtering circuit 1 is not less than a preset value, the single chip microcomputer controls the relay K to be inactive, the relay K is still in an initial disconnection state, the rectifying circuit 12 charges the capacitor CE1 and the capacitor CE2 in positive and negative half cycles of the input alternating current U0, and the voltage of the output end of the rectifying and filtering circuit 1 is 310V DC. Therefore, no matter the input alternating current U0 is 110V or 220V, the direct current of the output end is 310V, and circuits connected behind the output end can be commonly used, so that the development period of new products is saved.
Example two:
fig. 3 schematically illustrates a schematic diagram of a power identification conversion circuit according to another embodiment of the present invention. The rectifying and filtering circuit in the power identification and conversion circuit in this embodiment is the same as the rectifying and filtering circuit in the first embodiment, and is not described herein again.
The detection control circuit 2 in this embodiment includes a voltage divider circuit 21 and a control circuit 22. The voltage divider circuit 21 has the same structure as that of the first embodiment, except that the first voltage divider resistor R1 and the second voltage divider resistor R2 do not need to be designed as in the first embodiment, and the reference voltage Vb is only required to be ensured between two values of the voltage Va across the second voltage divider resistor R2 (i.e., the value of Va when U0 is 110V and the value of Va when U0 is 220V).
The control circuit 22 is composed of a comparison circuit 22A and a triode Q1, the comparison circuit 22A controls the on-off of the triode Q1 according to the voltage of the second voltage-dividing resistor R2 and the reference voltage, when the triode Q1 is switched on, the switch 11 is switched off, and when the triode Q1 is switched off, the switch 11 is switched on.
Specifically, referring to fig. 3, a comparator U1 is disposed in the comparison circuit 22A, the voltage Va across the second voltage-dividing resistor R2 is input to the positive input terminal of the comparator U1 after passing through a resistor R3, a capacitor C3 is further connected to two ends of the second voltage-dividing resistor R2 to filter two short voltages across the second voltage-dividing resistor R2, the negative input terminal of the comparator U1 is connected to the voltage Vcc through a resistor R4, the negative input terminal of the comparator U1 is further connected to ground through a resistor R5, the reference voltage Vb at the negative input terminal of the comparator is R5 Vcc/(R4+ R5), the output terminal of the comparator U1 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is connected to ground, the collector of the transistor Q1 controls the relay K, and the transistor Q1 is of NPN type. The comparator U1 compares the voltage Va on the second voltage-dividing resistor R2 with a reference voltage Vb, when the input alternating current U0 is 110V, the voltage Vdc of the positive electrode of the output end of the rectifying and filtering circuit 1 is 155V, the reference voltage Vb is larger than the voltage Va, the comparator U1 outputs low level to the triode Q1, the triode Q1 controls the relay K to be switched on, and the rectifying and filtering circuit 1 performs voltage-multiplying rectifying and filtering processing on the alternating current U0; when the input alternating current U0 is 220V, the voltage Vdc of the positive electrode of the output end of the rectifying and filtering circuit 1 is 310V, the reference voltage Vb is smaller than the voltage Va, the comparator U1 outputs a high level to the triode Q1, the triode Q1 controls the relay K to be still in a disconnected state, and the rectifying and filtering circuit 1 performs bridge type rectifying and filtering processing on the alternating current U0.
In the embodiment of the utility model, the rectification filter circuit is used to convert the input alternating current into direct current, the detection control circuit controls the switch in the rectification filter circuit according to the voltage of the anode at the output end of the rectification filter circuit, when the input alternating current is 110V, the rectifying and filtering circuit works in a voltage-multiplying rectifying and filtering mode, when the input alternating current is 220V, the rectifying and filtering circuit works in a bridge type rectifying and filtering mode, the voltage of the output end of the rectifying and filtering circuit is 330V, the direct current output voltage is the same and can be universal, and integrates the voltage-doubling rectifying filter and the bridge type rectifying filter, has simple circuit and easy realization, and saves cost, in addition, the rectification filter circuit utilizes the parallel rectifier bridges to realize the rectification function, the parallel rectifier bridge shunts the input alternating current, so that the rectifier circuit is resistant to heavy current impact and high in circuit reliability.
Example three:
another embodiment of the utility model provides an air conditioner, including above-mentioned power discernment converting circuit.
The air conditioner has the same technical characteristics as the power identification and conversion circuit in the above embodiment, and has the same advantages as the power identification and conversion circuit in the above embodiment, which is not described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (11)
1. A power identification conversion circuit, the circuit comprising:
the rectifier filter circuit (1) converts input alternating current into direct current, and a switch (11) is arranged in the rectifier filter circuit (1);
the detection control circuit (2) detects the voltage of the positive electrode of the output end of the rectification filter circuit (1), when the voltage of the positive electrode of the output end is smaller than a preset value, the switch (11) is switched on, the rectification filter circuit (1) is a voltage-doubling rectification filter circuit, when the voltage of the positive electrode of the output end is not smaller than the preset value, the switch (11) is switched off, and the rectification filter circuit (1) is a bridge rectification filter circuit.
2. The power supply identification conversion circuit according to claim 1, wherein the rectification filter circuit (1) further comprises a rectification circuit (12), the rectification circuit (12) is formed by connecting N rectification bridges in parallel, and N is an integer greater than 1.
3. The power identification conversion circuit according to claim 1 or 2, characterized in that the rectifying and filtering circuit (1) further comprises a filtering circuit (13), the filtering circuit (13) is formed by a capacitor CE1 and a capacitor CE2 in series, one end of the switch (11) is connected to the capacitor CE1 and the capacitor CE2, and the other end of the switch (11) is connected to the AC input neutral line AC _ N of the power identification conversion circuit.
4. The power identification conversion circuit according to claim 1, wherein the detection control circuit (2) comprises a voltage dividing circuit (21) and a control circuit (22), the voltage dividing circuit (21) divides the voltage at the positive electrode of the output end of the rectification filter circuit (1), and the control circuit (22) switches on or off the switch (11) according to the divided voltage.
5. The power identification conversion circuit according to claim 4, wherein the voltage dividing circuit (21) comprises a first voltage dividing resistor R1 and a second voltage dividing resistor R2 connected in series, the other end of the first voltage dividing resistor R1 is connected to the positive electrode of the output terminal of the rectifying and filtering circuit (1), the other end of the second voltage dividing resistor R2 is connected to the ground, and the control circuit (22) switches on or off the switch (11) according to the voltage across the second voltage dividing resistor R2.
6. The power identification conversion circuit according to claim 5, wherein the control circuit (22) is composed of a comparison circuit (22A) and a transistor Q1, and the comparison circuit (22A) controls the on/off of the transistor Q1 according to the voltage of the second voltage-dividing resistor R2 and the reference voltage, so as to switch on or off the switch (11).
7. The power supply identification conversion circuit according to claim 5, wherein the control circuit (22) is composed of a single chip microcomputer and peripheral circuits thereof, and the single chip microcomputer switches on or off the switch (11) according to the voltage across the second voltage-dividing resistor R2.
8. The power identification conversion circuit according to claim 7, further comprising a power supply system (3), wherein an input end of the power supply system (3) is connected to an output end of the rectification filter circuit (1), and an output end of the power supply system (3) is connected to a power supply input end of the single chip microcomputer.
9. The power identification conversion circuit according to claim 5, wherein a capacitor C3 is provided between an input terminal of the control circuit (22) connected to the second voltage dividing resistor R2 and ground.
10. The power identification conversion circuit according to claim 1, wherein the switch (11) is a relay.
11. An air conditioner characterized in that it comprises a power identification conversion circuit according to any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020553772.9U CN211508931U (en) | 2020-04-15 | 2020-04-15 | Power supply identification conversion circuit and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020553772.9U CN211508931U (en) | 2020-04-15 | 2020-04-15 | Power supply identification conversion circuit and air conditioner |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541533A (en) * | 2021-07-15 | 2021-10-22 | 深圳华秋电子有限公司 | Brushless motor control method utilizing voltage doubling principle |
| CN113595411A (en) * | 2021-06-30 | 2021-11-02 | 新界泵业(浙江)有限公司 | Double-voltage change-over switch, equipment applying double-voltage change-over switch and control method |
| WO2022080661A1 (en) * | 2020-10-15 | 2022-04-21 | 삼성전자주식회사 | Power supply device and method for controlling same |
| CN115441754A (en) * | 2022-11-04 | 2022-12-06 | 深圳市欧拉智造科技有限公司 | Power supply circuit, power supply circuit and electrical apparatus |
-
2020
- 2020-04-15 CN CN202020553772.9U patent/CN211508931U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022080661A1 (en) * | 2020-10-15 | 2022-04-21 | 삼성전자주식회사 | Power supply device and method for controlling same |
| CN113595411A (en) * | 2021-06-30 | 2021-11-02 | 新界泵业(浙江)有限公司 | Double-voltage change-over switch, equipment applying double-voltage change-over switch and control method |
| CN113541533A (en) * | 2021-07-15 | 2021-10-22 | 深圳华秋电子有限公司 | Brushless motor control method utilizing voltage doubling principle |
| CN115441754A (en) * | 2022-11-04 | 2022-12-06 | 深圳市欧拉智造科技有限公司 | Power supply circuit, power supply circuit and electrical apparatus |
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