CN116914754A - Input switching method and device compatible with AC/DC power supply and power supply device - Google Patents

Input switching method and device compatible with AC/DC power supply and power supply device Download PDF

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Publication number
CN116914754A
CN116914754A CN202310927966.9A CN202310927966A CN116914754A CN 116914754 A CN116914754 A CN 116914754A CN 202310927966 A CN202310927966 A CN 202310927966A CN 116914754 A CN116914754 A CN 116914754A
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China
Prior art keywords
power supply
input
resistor
detection circuit
output
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CN202310927966.9A
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Chinese (zh)
Inventor
邓平
岳冯欢
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Sichuan Changhong Air Conditioner Co Ltd
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Sichuan Changhong Air Conditioner Co Ltd
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Priority to CN202310927966.9A priority Critical patent/CN116914754A/en
Publication of CN116914754A publication Critical patent/CN116914754A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The application provides an input switching method and device compatible with an alternating current and direct current power supply and a power supply device, wherein the switching device comprises the following components: the device comprises an input voltage detection circuit, a rectifier, an energy storage capacitor, an output voltage detection circuit, a relay, a sampling resistor and a controller; the controller is respectively connected with the output end of the input voltage detection circuit, the output end of the output voltage detection circuit and the second end of the switch of the relay, and is used for controlling the relay to be disconnected according to the received power supply switching signal and controlling the relay to be connected when the difference between the voltage value output by the input voltage detection circuit and the voltage value output by the output voltage detection circuit is smaller than or equal to a preset threshold value; after the AC/DC power supply is switched and the input voltage and the output voltage are relatively stable, the external input power supply supplies power to the rear-stage load, so that the stable and rapid switching of the AC/DC power supply input by the servo drive and the frequency conversion device can be realized, the load is prevented from being impacted by current, and the reliable operation of the load is ensured.

Description

Input switching method and device compatible with AC/DC power supply and power supply device
Technical Field
The present application relates to the field of power switching control technologies, and in particular, to a method and an apparatus for switching input of a compatible ac/dc power supply, and a power supply device.
Background
Along with the popularization and technical development of new energy, various servo drive products and frequency converters start to use the new energy to supply power. The power supply of the servo drive and the frequency converter after the storage of new energy sources such as wind, photoelectricity and the like is largely implemented. But the new energy has the influence of illumination and wind power instability factors, has limited energy storage, and has wide application prospect in order to ensure the continuous and reliable operation of the servo drive and the frequency converter and the compatibility of the power supply mode of the AC/DC power supply.
However, the servo drive compatible with the input of an alternating current and direct current power supply and the frequency converter are capacitive loads, and the problems of power grid harmonic pollution, device reliability reduction and the like caused by larger current impact to a power grid, energy storage equipment, a relay and a silicon controlled rectifier due to unbalance of input voltage at the moment of power-on and power-supply switching are caused.
Disclosure of Invention
Aiming at the defects existing in the prior art, the input switching method and device for the compatible alternating current and direct current power supply and the power supply device provided by the application solve the problem that the switching of the alternating current and direct current power supply in the prior art can cause the circuit to be impacted by current, thereby influencing the reliability of devices.
In a first aspect, the present application provides an input switching device compatible with an ac/dc power supply, the switching device comprising: the device comprises an input voltage detection circuit, a rectifier, an energy storage capacitor, an output voltage detection circuit, a relay, a sampling resistor and a controller; the input end of the input voltage detection circuit is connected with the live wire end of an external input power supply, the input end of the rectifier is connected with the external input power supply, the energy storage capacitor is connected with the output end of the rectifier, and the input end of the output voltage detection circuit is connected with the energy storage capacitor; the first end of the coil of the relay is connected with the controller, the second end of the coil of the relay is connected with a power supply, the first end of the switch of the relay is connected with the live wire end of the external input power supply, and the second end of the switch of the relay is connected with the live wire end of the external input power supply through the sampling resistor; the controller is further connected with the output end of the input voltage detection circuit, the output end of the output voltage detection circuit and the second end of the switch of the relay, and is used for controlling the relay to be disconnected according to the received power supply switching signal, and is also used for controlling the relay to be connected when the difference between the voltage value output by the input voltage detection circuit and the voltage value output by the output voltage detection circuit is smaller than or equal to a preset threshold value.
Optionally, the switching device further includes: and the input end of the filter circuit is connected with the external input power supply, and the output end of the filter circuit is connected with the input end of the rectifier.
Optionally, the input voltage detection circuit includes: a first resistor, a diode and a second resistor; the first end of the first resistor is connected with the live wire end of the external input power supply, the second end of the first resistor is connected with the anode of the diode, the cathode of the diode is connected with the first end of the second resistor, the first end of the second resistor is further connected with the controller, and the second end of the second resistor is grounded.
Optionally, the output voltage detection circuit includes: a third resistor and a fourth resistor; the first end of the third resistor is connected with the positive electrode end of the energy storage capacitor, the second end of the third resistor is grounded through the fourth resistor, and the second end of the third resistor is also connected with the controller.
Optionally, the switching device further includes: and the first end of the fifth resistor is connected with the first end of the switch of the relay, and the second end of the fifth resistor is connected with the first end of the sampling resistor.
Optionally, the filtering circuit includes: the first differential-mode inductor, the second differential-mode inductor and the common-mode inductor; the first end of the first differential mode inductor is connected with the zero line end of the external input power supply, the second end of the first differential mode inductor is connected with the first input end of the common mode inductor, the first end of the second differential mode inductor is connected with the live wire end of the external input power supply, the second end of the second differential mode inductor is connected with the second input end of the common mode inductor, and the output end of the common mode inductor is connected with the output end of the rectifier.
Optionally, the filtering circuit further includes: a first inter-line capacitance and a bleeder resistor; the first end of the first inter-line capacitor is connected with the first end of the first differential mode inductor, and the second end of the first inter-line capacitor is connected with the first end of the second differential mode inductor; the first end of the bleeder resistor is connected with the first end of the first inter-line capacitor, and the second end of the bleeder resistor is connected with the second end of the first inter-line capacitor.
Optionally, the filtering circuit further includes: a second line-to-line capacitance, a first ground capacitance, and a second ground capacitance; the first end of the second line-to-line capacitor is connected with the first output end of the common mode inductor, the second end of the second line-to-line capacitor is connected with the second output end of the common mode inductor, the first end of the first grounding capacitor is connected with the first output end of the common mode inductor, the second end of the first grounding capacitor is grounded, the first end of the second grounding capacitor is connected with the second output end of the common mode inductor, and the second end of the second grounding capacitor is grounded.
In a second aspect, the present application provides an input switching method compatible with an ac/dc power supply, the switching method comprising: when the controller receives a first power supply switching signal, the relay is controlled to be disconnected, and a current input current value is obtained through the sampling resistor; when the current input current value is equal to a preset current value, the controller sends out a second power supply switching signal, so that the external switching equipment performs input switching of an alternating current power supply and a direct current power supply according to the second power supply switching signal; the controller calculates real-time pressure difference according to the voltage value output by the input voltage detection circuit and the voltage value output by the output voltage detection circuit; and when the real-time pressure difference is smaller than or equal to a preset threshold value, controlling the relay to be attracted.
In a third aspect, the present application provides a power supply device, where the power supply device includes the input switching device compatible with ac/dc power, a switching device, an ac power source, and a dc power source.
Compared with the prior art, the application has the following beneficial effects:
the application firstly controls the relay to be disconnected through the controller, and cuts off the access between the external input power supply and the switching device; when the input current value is detected to be zero, the external alternating current power supply and the direct current power supply are controlled to be switched, and when the current external input voltage is equal to the output voltage of the switching device, the relay is controlled to be attracted through the controller, so that the input power supply after the alternating current power supply is switched supplies power to a rear-stage load through the switching device; therefore, after the AC/DC power supply is switched and the input voltage and the output voltage are relatively stable, the external input power supply supplies power to the subsequent stage load, so that the stable and rapid switching of the AC/DC power supply input by the servo drive and the frequency conversion device can be realized, the load is prevented from being impacted by current, and the reliable operation of the load is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of an input switching device compatible with ac/dc power provided in an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a filtering circuit according to an embodiment of the present application;
fig. 3 is a schematic flow chart of an input switching method compatible with ac/dc power supply according to an embodiment of the present application;
fig. 4 is a schematic diagram of timing control according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. The functional units of the same reference numerals in the examples of the present application have the same and similar structures and functions.
Example 1
Fig. 1 is a schematic structural diagram of an input switching device compatible with ac/dc power provided in an embodiment of the present application, where, as shown in fig. 1, the switching device includes:
an input voltage detection circuit 110, a rectifier VC, an energy storage capacitor C1, an output voltage detection circuit 120, a relay K1, a sampling resistor R0, and a controller U1;
the input end of the input voltage detection circuit 110 is connected with the live wire end of an external input power supply, the input end of the rectifier VC is connected with the external input power supply, the energy storage capacitor C1 is connected with the output end of the rectifier VC, and the input end of the output voltage detection circuit 120 is connected with the energy storage capacitor C1;
the first end of the coil of the relay K1 is connected with the controller U1, the second end of the coil of the relay K1 is connected with a power supply, the first end of the switch of the relay K1 is connected with the live wire end of the external input power supply, and the second end of the switch of the relay K1 is connected with the live wire end of the external input power supply through the sampling resistor R0;
the controller U1 is further connected to the output end of the input voltage detection circuit 110, the output end of the output voltage detection circuit 120, and the second end of the switch of the relay K1, and is configured to control the relay K1 to be turned off according to the received power switching signal, and is further configured to control the relay K1 to be turned on when a difference between the voltage value output by the input voltage detection circuit 110 and the voltage value output by the output voltage detection circuit 120 is less than or equal to a preset threshold.
It should be noted that, in this embodiment, the input voltage detection circuit is used for detecting a voltage value input by an external input power source, the rectifier is used for converting an input alternating current into a direct current, the storage capacitor is used for storing the direct current output by the rectifier, the output voltage detection circuit is used for detecting a voltage value output by the storage capacitor, the relay is used for controlling whether a voltage input by the external input power source is input into the rectifier, the sampling resistor is used for detecting whether the relay is completely disconnected, and the controller is used for controlling disconnection and suction of the relay. Wherein the external input power source comprises a direct current power source and an alternating current power source, and only one of the two power sources is connected with the input switching device in the embodiment in the same time period.
The working principle of the switching device in this embodiment is as follows: when the controller receives a power supply switching signal, detecting an input current value, and when the input current value is zero, judging that the system is required to switch the input power supply, at the moment, controlling a servo driver, a relay of a frequency converter or a controllable silicon to disconnect a power supply input port, and simultaneously sending a switching readiness signal to external switching equipment; after the external switching equipment completes AC/DC switching on the input power supply, detecting the voltage difference between the voltage value output by the output voltage detection circuit and the voltage value output by the input voltage detection circuit, and when the voltage difference is smaller than a preset threshold value delta V1, sucking the relay or the controllable silicon to start normal power supply operation on the servo drive and the frequency converter.
Compared with the prior art, the application has the following beneficial effects:
the application firstly controls the relay to be disconnected through the controller, and cuts off the access between the external input power supply and the switching device; when the input current value is detected to be zero, the external alternating current power supply and the direct current power supply are controlled to be switched, and when the current external input voltage is equal to the output voltage of the switching device, the relay is controlled to be attracted through the controller, so that the input power supply after the alternating current power supply is switched supplies power to a rear-stage load through the switching device; therefore, after the AC/DC power supply is switched and the input voltage and the output voltage are relatively stable, the external input power supply supplies power to the subsequent stage load, so that the stable and rapid switching of the AC/DC power supply input by the servo drive and the frequency conversion device can be realized, the load is prevented from being impacted by current, and the reliable operation of the load is ensured.
In an embodiment, the switching device further comprises: the input end of the filter circuit is connected with the external input power supply, and the output end of the filter circuit is connected with the input end of the rectifier; for filtering the voltage signal input by the external input power source.
As shown in fig. 2, the filter circuit includes: the first differential-mode inductor L1, the second differential-mode inductor L2 and the common-mode inductor L3; the first end of the first differential mode inductor L1 is connected with the zero line end of the external input power supply, the second end of the first differential mode inductor L1 is connected with the first input end of the common mode inductor L3, the first end of the second differential mode inductor L2 is connected with the live wire end of the external input power supply, the second end of the second differential mode inductor L2 is connected with the second input end of the common mode inductor L3, and the output end of the common mode inductor L3 is connected with the output end of the rectifier.
Further, the filter circuit further includes: a first inter-line capacitance C2 and a bleeder resistor R6; the first end of the first inter-line capacitor C2 is connected to the first end of the first differential mode inductor L1, and the second end of the first inter-line capacitor C2 is connected to the first end of the second differential mode inductor L2; the first end of the bleeder resistor R6 is connected to the first end of the first inter-line capacitor C2, and the second end of the bleeder resistor R6 is connected to the second end of the first inter-line capacitor C2.
Further, the filter circuit further includes: a second line-to-line capacitance C3, a first capacitance to ground C4, and a second capacitance to ground C5; the first end of the second line-to-line capacitor C3 is connected with the first output end of the common mode inductor L3, the second end of the second line-to-line capacitor C3 is connected with the second output end of the common mode inductor L3, the first end of the first grounding capacitor C4 is connected with the first output end of the common mode inductor L3, the second end of the first grounding capacitor C4 is grounded, the first end of the second grounding capacitor C5 is connected with the second output end of the common mode inductor L3, and the second end of the second grounding capacitor C5 is grounded.
In this embodiment, the input voltage detection circuit includes: a first resistor R1, a diode D1 and a second resistor R2; the first end of the first resistor R1 is connected with the live wire end of the external input power supply, the second end of the first resistor R1 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the first end of the second resistor R2, the first end of the second resistor R2 is also connected with the controller, and the second end of the second resistor R2 is grounded.
In this embodiment, the voltage input by the external input power supply is divided by the first resistor R1 and the second resistor R2 and then output to the controller for detection; the first resistor R1 may be a resistor with a large resistance value, or may be formed by connecting a plurality of resistors with small resistance values in series; the diode D1 in this embodiment has an anti-reverse connection function, preventing the live and neutral terminals of the external input power supply from being terminated in reverse.
In this embodiment, the output voltage detection circuit includes: a third resistor R3 and a fourth resistor R4; the first end of the third resistor R3 is connected with the positive electrode end of the energy storage capacitor, the second end of the third resistor R3 is grounded through the fourth resistor R4, and the second end of the third resistor R3 is also connected with the controller.
In this embodiment, the voltage output by the energy storage capacitor is divided by the third resistor R3 and the fourth resistor R4 and then output to the controller for detection; the third resistor R3 may be a resistor with a large resistance value, or may be formed by connecting a plurality of resistors with small resistance values in series.
In this embodiment, the switching device further includes: a fifth resistor R5, wherein a first end of the fifth resistor R5 is connected to the first end of the switch of the relay, and a second end of the fifth resistor R5 is connected to the first end of the sampling resistor; the fifth resistor R5 is a variable resistor and plays a role in current limiting.
Example two
Fig. 3 is a schematic flow chart of an input switching method of a compatible ac/dc power supply according to an embodiment of the present application, as shown in fig. 3, the switching method specifically includes the following steps:
step S101, when a controller receives a first power supply switching signal, the relay is controlled to be disconnected, and a current input current value is obtained through the sampling resistor;
step S102, when the current input current value is equal to a preset current value, the controller sends out a second power supply switching signal to enable the external switching equipment to perform input switching of an alternating current power supply and a direct current power supply according to the second power supply switching signal;
step S103, the controller calculates real-time pressure difference according to the voltage value output by the input voltage detection circuit and the voltage value output by the output voltage detection circuit;
and step S104, when the real-time pressure difference is smaller than or equal to a preset threshold value, controlling the relay to be attracted.
It should be noted that, as shown in fig. 3 and fig. 4, after the load at the rear stage is powered on and operated, when the controller receives the first power switching signal a, the relay K1 is turned off at the time T0; after the relay K1 is turned off, an input current value is detected through the sampling resistor R0, when the input current value iin=0, the relay K1 is ensured to be completely turned off, and the controller sends a second power switching signal B ready for switching to an external switching device for switching between an ac power supply and a dc power supply.
After the external switching equipment receives the signal B, the alternating current and direct current power supply is switched at the moment T1. Simultaneously detecting an input voltage value Vin through an input voltage detection circuit; detecting the direct current bus voltage Vdc on the energy storage capacitor C1 through an output voltage detection circuit, and calculating Vin-vdc=deltaV; when the delta V is smaller than a preset threshold delta V1, the controller controls the KIN signal to attract the relay K1 at the moment T2, and the generated power supply switching impact current is in an acceptable range, so that the servo drive and the frequency converter normally operate; by analogy, when the controller receives the first power switching signal a again, the processes of the above steps S101 to S104 are repeated; the preset threshold Δv1 is an error range value, and in theory, the switching is the most ideal state when Vin-vdc=0, but an error range needs to be set in practical application, and when the difference between Vin and Vdc is within the error range, the switching can be realized, and the value of the error range can be set according to the practical application scene. Therefore, the application can greatly reduce the power grid/power supply current impact caused by capacitive load through the related steps of disconnecting K1 and engaging K1, and ensure the continuous and reliable operation of the servo drive and the frequency converter during the switching of the AC/DC power supply.
In another embodiment of the present application, a power supply device is provided, where the power supply device includes the input switching device, the ac power supply, and the dc power supply compatible with the ac power supply described in the foregoing embodiments.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An input switching device compatible with an ac/dc power supply, the switching device comprising:
the device comprises an input voltage detection circuit, a rectifier, an energy storage capacitor, an output voltage detection circuit, a relay, a sampling resistor and a controller;
the input end of the input voltage detection circuit is connected with the live wire end of an external input power supply, the input end of the rectifier is connected with the external input power supply, the energy storage capacitor is connected with the output end of the rectifier, and the input end of the output voltage detection circuit is connected with the energy storage capacitor;
the first end of the coil of the relay is connected with the controller, the second end of the coil of the relay is connected with a power supply, the first end of the switch of the relay is connected with the live wire end of the external input power supply, and the second end of the switch of the relay is connected with the live wire end of the external input power supply through the sampling resistor;
the controller is further connected with the output end of the input voltage detection circuit, the output end of the output voltage detection circuit and the second end of the switch of the relay, and is used for controlling the relay to be disconnected according to the received power supply switching signal, and is also used for controlling the relay to be connected when the difference between the voltage value output by the input voltage detection circuit and the voltage value output by the output voltage detection circuit is smaller than or equal to a preset threshold value.
2. The ac/dc power compatible input switching device of claim 1, wherein said switching device further comprises:
and the input end of the filter circuit is connected with the external input power supply, and the output end of the filter circuit is connected with the input end of the rectifier.
3. The ac/dc power compatible input switching apparatus of claim 1, wherein said input voltage detection circuit comprises:
a first resistor, a diode and a second resistor;
the first end of the first resistor is connected with the live wire end of the external input power supply, the second end of the first resistor is connected with the anode of the diode, the cathode of the diode is connected with the first end of the second resistor, the first end of the second resistor is further connected with the controller, and the second end of the second resistor is grounded.
4. The ac/dc power compatible input switching apparatus of claim 1, wherein said output voltage detection circuit comprises:
a third resistor and a fourth resistor;
the first end of the third resistor is connected with the positive electrode end of the energy storage capacitor, the second end of the third resistor is grounded through the fourth resistor, and the second end of the third resistor is also connected with the controller.
5. The ac/dc power compatible input switching device of claim 2, wherein said switching device further comprises:
and the first end of the fifth resistor is connected with the first end of the switch of the relay, and the second end of the fifth resistor is connected with the first end of the sampling resistor.
6. The ac/dc power compatible input switching apparatus of claim 2, wherein said filter circuit comprises:
the first differential-mode inductor, the second differential-mode inductor and the common-mode inductor;
the first end of the first differential mode inductor is connected with the zero line end of the external input power supply, the second end of the first differential mode inductor is connected with the first input end of the common mode inductor, the first end of the second differential mode inductor is connected with the live wire end of the external input power supply, the second end of the second differential mode inductor is connected with the second input end of the common mode inductor, and the output end of the common mode inductor is connected with the output end of the rectifier.
7. The ac/dc power compatible input switching device of claim 6, wherein said filter circuit further comprises:
a first inter-line capacitance and a bleeder resistor;
the first end of the first inter-line capacitor is connected with the first end of the first differential mode inductor, and the second end of the first inter-line capacitor is connected with the first end of the second differential mode inductor; the first end of the bleeder resistor is connected with the first end of the first inter-line capacitor, and the second end of the bleeder resistor is connected with the second end of the first inter-line capacitor.
8. The ac/dc power compatible input switching device of claim 6, wherein said filter circuit further comprises:
a second line-to-line capacitance, a first ground capacitance, and a second ground capacitance;
the first end of the second line-to-line capacitor is connected with the first output end of the common mode inductor, the second end of the second line-to-line capacitor is connected with the second output end of the common mode inductor, the first end of the first grounding capacitor is connected with the first output end of the common mode inductor, the second end of the first grounding capacitor is grounded, the first end of the second grounding capacitor is connected with the second output end of the common mode inductor, and the second end of the second grounding capacitor is grounded.
9. A switching method of an input switching device based on the compatible ac/dc power supply according to any one of claims 1 to 8, characterized in that the switching method comprises:
when the controller receives a first power supply switching signal, the relay is controlled to be disconnected, and a current input current value is obtained through the sampling resistor;
when the current input current value is equal to a preset current value, the controller sends out a second power supply switching signal, so that the external switching equipment performs input switching of an alternating current power supply and a direct current power supply according to the second power supply switching signal;
the controller calculates real-time pressure difference according to the voltage value output by the input voltage detection circuit and the voltage value output by the output voltage detection circuit;
and when the real-time pressure difference is smaller than or equal to a preset threshold value, controlling the relay to be attracted.
10. A power supply device, characterized in that the power supply device comprises an ac-dc power compatible input switching device, a switching apparatus, an ac power source and a dc power source according to any one of claims 1 to 8.
CN202310927966.9A 2023-07-26 2023-07-26 Input switching method and device compatible with AC/DC power supply and power supply device Pending CN116914754A (en)

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Publication number Priority date Publication date Assignee Title
CN117439205A (en) * 2023-12-15 2024-01-23 珠海科创储能科技有限公司 Current switching circuit, method, storage medium, and electronic device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117439205A (en) * 2023-12-15 2024-01-23 珠海科创储能科技有限公司 Current switching circuit, method, storage medium, and electronic device
CN117439205B (en) * 2023-12-15 2024-04-02 珠海科创储能科技有限公司 Current switching circuit, method, storage medium, and electronic device

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