CN219227457U - Anti-backflow circuit and power supply equipment - Google Patents

Anti-backflow circuit and power supply equipment Download PDF

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Publication number
CN219227457U
CN219227457U CN202223468420.1U CN202223468420U CN219227457U CN 219227457 U CN219227457 U CN 219227457U CN 202223468420 U CN202223468420 U CN 202223468420U CN 219227457 U CN219227457 U CN 219227457U
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power supply
module
supply voltage
backflow
switch
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CN202223468420.1U
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卢志国
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Invt Electric Vehicle Drive Technology Shenzhen Co ltd
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Invt Electric Vehicle Drive Technology Shenzhen Co ltd
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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
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

Abstract

The application belongs to the technical field of power supply, and provides a prevent flowing backward circuit and power supply unit, prevent flowing backward circuit and include: the device comprises a main power supply module, a backup power supply module, a load port, an anti-backflow switch module and a comparison control module. According to the comparison control module, whether the current power is supplied to the load is judged according to the received first power supply voltage and the second power supply voltage, and when the second power supply voltage is supplied to the load, the backflow-preventing switch module is controlled to be disconnected, so that the backflow of the second power supply voltage provided by the backup power supply module to the main power supply module can be prevented, the service life of the backup power supply module is prolonged, and the circuit stability is improved.

Description

Anti-backflow circuit and power supply equipment
Technical Field
The application belongs to the technical field of power supply, and particularly relates to a backflow prevention circuit and power supply equipment.
Background
In order to prevent the low-voltage abnormality of the main battery, the electric automobile causes the failure of a driver and further causes the out-of-control of the whole automobile due to the consideration of functional safety. When the existing automobile is produced, a backup circuit group power supply is generally designed to supply power for the driver of the automobile when the main battery fails, so that the normal operation of the driver of the automobile is ensured.
However, when the backup power source is started to supply power to the driver, the power supply voltage provided by the backup power source may flow back to the main battery, so that overload of the backup power source is caused, and even failure or damage of the backup power source function is caused, thereby causing potential safety hazard of the whole vehicle.
Disclosure of Invention
In order to solve the technical problem, the embodiment of the application provides a backflow prevention circuit and power supply equipment, and aims to solve the problem that the existing power supply voltage provided by a backup power supply flows backwards into a main battery, so that overload of the backup power supply is caused, and even the backup power supply is caused to fail or be damaged, so that potential safety hazards of the whole automobile are caused.
A first aspect of embodiments of the present application provides a backflow prevention circuit, the backflow prevention circuit comprising:
the main power supply module is used for providing a first power supply voltage;
the backup power supply module is used for providing a second power supply voltage;
the load port is connected with the backup power supply module;
the anti-backflow switch module is connected between the main power supply module and the load port;
and the comparison control module is respectively connected with the main power supply module, the backup power supply module and the backflow prevention switch module and is used for receiving the first power supply voltage and the second power supply voltage, comparing the first power supply voltage with the second power supply voltage, generating a switch control signal and outputting the switch control signal to the backflow prevention switch module so as to control the switch state of the backflow prevention switch module.
In one embodiment, the comparison control module includes:
the comparison unit is respectively connected with the main power supply module and the backup power supply module and is used for receiving the first power supply voltage and the second power supply voltage, comparing the first power supply voltage with the second power supply voltage and generating a comparison signal according to a comparison result;
and the control unit is connected with the comparison unit and is used for receiving the comparison signal and generating the switch control signal according to the comparison signal.
In one embodiment, the backflow prevention switch module includes:
the anti-backflow switch unit is connected between the main power supply module and the load port;
the driving switch unit is respectively connected with the main power supply module, the comparison control module and the backflow preventing switch unit, and is used for receiving the switch control signal and the first power supply voltage, and generating a driving control signal to the backflow preventing switch unit according to the switch control signal and the first power supply voltage so as to drive the backflow preventing switch unit to be turned on or turned off.
In one embodiment, the comparison unit comprises: a comparator and a first resistor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the positive phase input end of the comparator is connected with the backup power supply module, the negative phase input end of the comparator is connected with the main power supply module, and the output end of the comparator is connected with the control unit after being connected with the first resistor in series.
In one embodiment, the control unit comprises: the second resistor and the first switch tube; wherein, the liquid crystal display device comprises a liquid crystal display device,
the control end of the first switching tube is connected with the comparison unit, the first end of the first switching tube is grounded, the second end of the first switching tube is connected with the backflow prevention switching module, and the second resistor is connected between the control end and the first end of the first switching tube in series.
In one embodiment, the driving switching unit includes: the third resistor, the fourth resistor, the fifth resistor and the second switch tube; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first end of the fourth resistor is connected with the main power supply module, the second end of the fourth resistor and the control end of the second switching tube are connected with the comparison control module, the first end of the second switching tube is grounded, the second end of the second switching tube is connected with the fifth resistor in series and then connected with the backflow prevention switching unit, and the third resistor is connected between the control end and the first end of the second switching tube in series.
In one embodiment, the backflow preventing switching unit includes: a sixth resistor and a third switching tube; wherein, the liquid crystal display device comprises a liquid crystal display device,
the control end of the third switching tube is connected with the driving switching unit, the first end of the third switching tube is connected with the main power supply module, the second end of the third switching tube is connected with the load port, and the sixth resistor is connected in series between the control end and the second end of the third switching tube.
In one embodiment, the backup power module includes: the first diode, the second diode, the first capacitor and the isolation transformer; wherein, the liquid crystal display device comprises a liquid crystal display device,
the input end of the isolation transformer is used for being connected with the backup battery pack, the first output end of the isolation transformer is connected with the first diode in series and then is connected with the anode of the second diode, the second output end of the isolation transformer is grounded, the cathode of the second diode is connected with the load port, the first end of the first capacitor is connected with the anode of the second diode, and the second end of the second capacitor is grounded.
In one embodiment, the anti-backflow circuit further comprises:
and the output voltage stabilizing module is connected with the load port and is used for stabilizing the voltage of the load port.
A second aspect of the embodiments of the present application provides a power supply apparatus, including: a driver, further comprising: a backflow prevention circuit as claimed in any one of the preceding claims; the load port of the anti-backflow circuit is connected with the driver.
Compared with the prior art, the embodiment of the application has the beneficial effects that: the comparison control module can judge whether the current power is supplied to the load is the first power supply voltage or the second power supply voltage according to the received first power supply voltage and the second power supply voltage, and when the second power supply voltage is the load power supply, the backflow prevention switch module is controlled to be disconnected, so that the second power supply voltage connected with the backup power supply module can be prevented from flowing backwards to the main power supply module, the service life of the backup power supply module is prolonged, and the circuit stability is improved.
Drawings
FIG. 1 is a schematic diagram of a reverse flow preventing circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a reverse flow preventing circuit according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram III of a reverse flow prevention circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a specific circuit of the anti-backflow circuit according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is one or more than one unless specifically defined otherwise.
Reference in the specification to "one embodiment," "some embodiments," or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in a specific embodiment," "in a specific application," or the like in various places throughout this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless specifically emphasized otherwise. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In order to prevent the low-voltage abnormality of the main battery, the electric automobile causes the failure of a driver and further causes the out-of-control of the whole automobile due to the consideration of functional safety. When the existing driver is produced, a backup circuit group is generally designed to supply power for the driver of the automobile when the main battery fails, so that the normal operation of the driver of the automobile is ensured.
However, when the backup power source is started to supply power to the driver, the power supply voltage provided by the backup power source may flow back to the main battery, so that overload of the backup power source is caused, and even failure or damage of the backup power source function is caused, thereby causing potential safety hazard of the whole vehicle.
To solve the above technical problem, an embodiment of the present application provides a backflow preventing circuit, as shown in fig. 1, the backflow preventing circuit includes: a main power module 10, a backup power module 20, a load port 30, a backflow prevention switch module 40, and a comparison control module 50.
Specifically, the main power module 10 is configured to provide a first supply voltage. The backup power module 20 is configured to provide a second supply voltage. The load port 30 is connected to the backup power module 20. The anti-backflow switch module 40 is connected between the main power module 10 and the load port 30. The comparison control module 50 is connected to the main power module 10, the backup power module 20, and the anti-backflow switch module 40, and the comparison control module 50 is configured to receive the first power supply voltage and the second power supply voltage, compare the first power supply voltage with the second power supply voltage, generate a switch control signal, and output the switch control signal to the anti-backflow switch module 40 to control the on-off state of the anti-backflow switch module 40.
In this embodiment, the main power module 10 may be connected to a main battery pack, and the main power module 10 is configured to provide a first power supply voltage. The backup power module 20 may be connected to a backup battery pack, where the backup power module 20 is configured to provide a second power supply voltage, where the second power supply voltage is smaller than the first power supply voltage, and when the main power module 10 can normally provide the first power supply voltage, the first power supply voltage is output to the load port 30 to supply power to the load connected to the load port 30. When the main power module 10 fails and cannot provide the first power supply voltage, that is, the backup power module 20 provides the second power supply voltage to supply power to the load of the load port 30, the second power supply voltage may flow back to the main power module 10, which may cause damage to the main power module 10 on the one hand, and increase the burden of the backup power module on the other hand, and even cause failure or damage of the backup power function, resulting in potential safety hazard of the whole vehicle.
In the present embodiment, the anti-backflow switch module 40 is connected between the main power module 10 and the load port 30, and the connection state of the main power module 10 and the load port 30 can be controlled by controlling the working state of the anti-backflow switch module 40. Specifically, the comparison control module 50 may compare the first power supply voltage with the second power supply voltage according to the received first power supply voltage and the second power supply voltage, so as to determine whether the current power is the first power supply voltage or the second power supply voltage, generate a switch control signal, and output the switch control signal to the anti-backflow switch module 40, so as to control the switch state of the anti-backflow switch module 40. For example, when the first power supply voltage is used for supplying power, the anti-backflow switching module 40 is controlled to be turned on, and when the second power supply voltage is used for supplying power, the anti-backflow switching module 40 is controlled to be turned off, so that the problem that the second power supply voltage flows backwards to the main power supply module 10 when the second power supply voltage is used for supplying power is avoided.
In the present embodiment, the backflow prevention switch module 40 can prevent the second power supply voltage, which is accessed by the backup power supply module 20, from flowing backward to the main power supply module 10. Therefore, the problem that the circuit flows backward when the backup power supply module 20 works is avoided, the service life of the backup power supply module 20 is prolonged, and the circuit stability is improved.
In one embodiment, referring to FIG. 2, the comparison control module 50 includes: a comparison unit 51 and a control unit 52.
Specifically, the comparing unit 51 is connected to the main power module 10 and the backup power module 20, and the comparing unit 51 is configured to receive the first power supply voltage and the second power supply voltage, compare the first power supply voltage with the second power supply voltage, and generate a comparison signal according to a comparison result. The control unit 52 is connected to the comparison unit 51, and the control unit 52 is configured to receive the comparison signal and generate a switch control signal according to the comparison signal.
In this embodiment, the comparing unit 51 is configured to perform a comparison process on the first power supply voltage and the second power supply voltage, for example, when the first power supply voltage is greater than the second power supply voltage, the comparing unit 51 generates a low-level comparison signal according to the comparison result, and the control unit 52 is turned off when receiving the low-level comparison signal. In contrast, when the first power supply voltage is smaller than the second power supply voltage, the comparing unit 51 generates a high-level comparison signal according to the comparison result, and the control unit 52 turns on the ground when receiving the high-level comparison signal, thereby generating a low-level switch control signal. In this embodiment, the comparison unit 51 and the control unit 52 are provided to determine whether the backup power module 20 is in an operating state, so as to prepare the control of the anti-backflow switch module 40 by the later-stage circuit.
In one embodiment, referring to fig. 2, the backflow prevention switch module 40 includes: a backflow prevention switching unit 41 and a driving switching unit 42.
Specifically, the backflow prevention switching unit 41 is connected between the main power module 10 and the load port 30. The driving switch unit 42 is respectively connected with the main power module 10, the comparison control module 50 and the backflow preventing switch unit 41, and the driving switch unit 42 is configured to receive the switching control signal and the first supply voltage, and generate a driving control signal to the backflow preventing switch unit 41 according to the switching control signal and the first supply voltage, so as to drive the backflow preventing switch unit 41 to be turned on or turned off.
In this embodiment, the driving switch unit 42 is configured to receive the switch control signal and the first supply voltage, for example, when the first supply voltage is greater than the second supply voltage, the comparison control module 50 is turned off, and at this time, the driving switch unit 42 can only receive the first supply voltage, and the driving switch unit 42 is turned on, so that the anti-backflow switch unit 41 is driven to be turned on, and the first supply voltage supplies power to the load. When the first supply voltage is smaller than the second supply voltage, the comparison control module 50 is grounded, so that a low-level switch control signal is generated, the driving switch unit 42 is turned off, the anti-backflow switch unit 41 is turned off, the load is powered by the second supply voltage at this time, and the anti-backflow switch unit 41 is turned off, so that the second supply voltage can be effectively prevented from flowing backwards to the main power supply module 10, and the service life of the backup power supply module 20 is prolonged.
In one embodiment, referring to fig. 4, the comparison unit 51 includes: a comparator U1 and a first resistor R1.
Specifically, the positive input terminal+ of the comparator U1 is connected to the backup power module 20 through the signal line Vout2, the negative input terminal-of the comparator U1 is connected to the main power module 10 through the signal line Vout1, the output terminal of the comparator U1 is connected to the control unit 52 after being connected to the first resistor R1 in series, the ground terminal of the comparator U1 is grounded, and the power terminal of the comparator U1 is connected to the load port 30 through the signal line Vout 3.
In this embodiment, the positive input terminal+ of the comparator U1 is configured to receive the second supply voltage, the negative input terminal-of the comparator U1 is configured to receive the first supply voltage, the output terminal of the comparator U1 is configured to output the comparison signal, the first resistor R1 is a current limiting resistor, and the first resistor R1 is configured to perform a current limiting process on the comparison signal. In this embodiment, when the first power supply voltage is greater than the second power supply voltage, the comparator U1 generates a low-level comparison signal according to the comparison result, and when the first power supply voltage is less than the second power supply voltage, the comparator U1 generates a high-level comparison signal according to the comparison result, and by setting the comparator U1, the connection between the main power supply module 10 and the backup power supply module 20 can be determined, so as to prepare for the control of the backflow prevention switch module 40 by the later-stage circuit.
In one embodiment, referring to FIG. 4, the control unit 52 includes: a second resistor R2 and a first switching tube Q1.
Specifically, the control end of the first switching tube Q1 is connected to the comparing unit 51, the first end of the first switching tube Q1 is grounded, the second end of the first switching tube Q1 is connected to the backflow preventing switching module 40, and the second resistor R2 is connected in series between the control end and the first end of the first switching tube Q1.
In this embodiment, the second resistor R2 is a voltage stabilizing resistor, the second resistor R2 is used for performing voltage stabilizing processing on the voltage of the control end of the first switching tube Q1, for example, the first switching tube Q1 is used for being turned on or off according to a comparison signal output by the comparator U1, for example, when the comparator U1 generates a low-level comparison signal according to a comparison result, the first switching tube Q1 is turned off, and when the comparator U1 generates a high-level comparison signal according to a comparison result, the first switching tube Q1 is turned on, and by setting the second resistor R2 and the first switching tube Q1, the judgment of the connection of the main power module 10 and the backup power module 20 to the power supply can be realized, so that the control of the anti-backflow switching module 40 by the later-stage circuit is prepared.
In one embodiment, referring to fig. 4, the driving switching unit 42 includes: the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the second switching tube Q2.
Specifically, the first end of the fourth resistor R4 is connected to the main power module 10, the second end of the fourth resistor R4 and the control end of the second switching tube Q2 are commonly connected to the comparison control module 50, the first end of the second switching tube Q2 is grounded, the second end of the second switching tube Q2 is connected in series with the fifth resistor R5 and then connected to the backflow preventing switching unit 41, and the third resistor R3 is connected in series between the control end and the first end of the second switching tube Q2.
In this embodiment, the third resistor R3 and the fourth resistor R4 are voltage dividing resistors, when the first switching tube Q1 is turned off, the third resistor R3 and the fourth resistor R4 divide the first power supply voltage, the second switching tube Q2 receives the divided first power supply voltage and then turns on, when the first switching tube Q1 is turned on, the second end of the fourth resistor R4 is grounded, and then the second switching tube Q2 is turned off. The present embodiment realizes the on or off state control of the backflow prevention switching unit 41 by providing the driving switching unit 42.
In one embodiment, referring to fig. 4, the backflow preventing switching unit 41 includes: a sixth resistor R6 and a third switching tube Q3.
Specifically, the control end of the third switching tube Q3 is connected to the driving switching unit 42, the first end of the third switching tube Q3 is connected to the main power module 10, the second end of the third switching tube Q3 is connected to the load port 30, and the sixth resistor R6 is connected in series between the control end and the second end of the third switching tube Q3. In this embodiment, the third switching tube Q3 is turned on or off according to the driving control signal sent by the second switching tube Q2, so as to implement the anti-backflow design for the main power module 10. For example, when the second switching transistor Q2 is turned on, a low-level driving control signal is generated, and the third switching transistor Q3 is turned on. When the second switching tube Q2 is turned off, a high-level driving control signal is generated, and the third switching tube Q3 is turned off, so that the problem that the second power supply voltage flows backward to the main power supply module 10 when the second power supply voltage supplies power is avoided.
In one embodiment, referring to FIG. 4, the backup power module 20 includes: the first diode D1, the second diode D2, the first capacitor C1 and the isolation transformer T1.
The input end of the isolation transformer T1 is used for being connected with the backup battery pack, the first output end of the isolation transformer T1 is connected with the anode of the second diode D2 after being connected with the first diode D1 in series, the second output end of the isolation transformer T1 is grounded, the cathode of the second diode D2 is connected with the load port, the first end of the first capacitor C1 is connected with the anode of the second diode D2, and the second end of the second capacitor is grounded.
In this embodiment, the isolation transformer T1 is configured to convert a voltage provided by the backup battery, the first diode D1 is configured to rectify a voltage provided by the first output terminal of the isolation transformer T1, the first capacitor C1 is configured to filter out a noise signal in the second supply voltage, thereby improving stability of the circuit, and the second diode D2 is configured to prevent the first supply voltage from flowing backward to the backup power module 20. For example, when the first supply voltage supplies power to the load, since the main power module 10 and the backup power module 20 are both connected to the load port 30, the first supply voltage may also flow backward to the backup power module 20, and the second diode D2 is provided in this application, so that the first supply voltage may be prevented from flowing backward to the backup power module 20.
In one embodiment, referring to fig. 3, the anti-backflow circuit further comprises: and the output voltage stabilizing module 60, wherein the output voltage stabilizing module 60 is connected with the load port 30, and is used for stabilizing the voltage of the load port 30. Referring to fig. 4, the output voltage stabilizing module 60 includes a seventh resistor R7, a first end of the seventh resistor R7 is connected to the load port 30, a second end of the seventh resistor R7 is grounded, and the output voltage stabilizing module 60 is configured to perform voltage stabilizing processing on the first supply voltage and the second supply voltage at the load port 30, so as to improve stability of the circuit.
The embodiment of the application also provides power supply equipment, which comprises: a driver, further comprising: a backflow prevention circuit as claimed in any one of the preceding claims; the load port of the anti-backflow circuit is connected with the driver.
In this embodiment, the main power module 10 is used for connecting a main battery pack, the backup power module 20 is used for connecting a backup power pack, the first power supply voltage and the second power supply voltage are used for supplying power to the driver, and when the main power module 10 works normally, the anti-backflow switch module 40 in the anti-backflow circuit is turned on, and the first power supply voltage provided by the anti-backflow switch module is used for supplying power to the driver. When the main power module 10 fails and is powered by the backup power module 20, the backflow prevention switch module 40 can be timely disconnected to prevent the second power supply voltage from flowing backward to the main power module 10, so that the service life of the backup power module 20 can be prolonged, and the stability of the power supply equipment can be improved.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims (10)

1. A backflow prevention circuit, the backflow prevention circuit comprising:
the main power supply module is used for providing a first power supply voltage;
the backup power supply module is used for providing a second power supply voltage;
the load port is connected with the backup power supply module;
the anti-backflow switch module is connected between the main power supply module and the load port;
and the comparison control module is respectively connected with the main power supply module, the backup power supply module and the backflow prevention switch module and is used for receiving the first power supply voltage and the second power supply voltage, comparing the first power supply voltage with the second power supply voltage, generating a switch control signal and outputting the switch control signal to the backflow prevention switch module so as to control the switch state of the backflow prevention switch module.
2. The anti-backflow circuit of claim 1, wherein the comparison control module comprises:
the comparison unit is respectively connected with the main power supply module and the backup power supply module and is used for receiving the first power supply voltage and the second power supply voltage, comparing the first power supply voltage with the second power supply voltage and generating a comparison signal according to a comparison result;
and the control unit is connected with the comparison unit and is used for receiving the comparison signal and generating the switch control signal according to the comparison signal.
3. The anti-reverse flow circuit of claim 1, wherein the anti-reverse flow switch module comprises:
the anti-backflow switch unit is connected between the main power supply module and the load port;
the driving switch unit is respectively connected with the main power supply module, the comparison control module and the backflow preventing switch unit, and is used for receiving the switch control signal and the first power supply voltage, and generating a driving control signal to the backflow preventing switch unit according to the switch control signal and the first power supply voltage so as to drive the backflow preventing switch unit to be turned on or turned off.
4. The anti-backflow circuit of claim 2, wherein the comparison unit comprises: a comparator and a first resistor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the positive phase input end of the comparator is connected with the backup power supply module, the negative phase input end of the comparator is connected with the main power supply module, and the output end of the comparator is connected with the control unit after being connected with the first resistor in series.
5. The anti-backflow circuit of claim 2, wherein the control unit comprises: the second resistor and the first switch tube; wherein, the liquid crystal display device comprises a liquid crystal display device,
the control end of the first switching tube is connected with the comparison unit, the first end of the first switching tube is grounded, the second end of the first switching tube is connected with the backflow prevention switching module, and the second resistor is connected between the control end and the first end of the first switching tube in series.
6. A backflow prevention circuit as claimed in claim 3, wherein the drive switch unit comprises: the third resistor, the fourth resistor, the fifth resistor and the second switch tube; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first end of the fourth resistor is connected with the main power supply module, the second end of the fourth resistor and the control end of the second switching tube are connected with the comparison control module, the first end of the second switching tube is grounded, the second end of the second switching tube is connected with the fifth resistor in series and then connected with the backflow prevention switching unit, and the third resistor is connected between the control end and the first end of the second switching tube in series.
7. A backflow prevention circuit as claimed in claim 3, wherein the backflow prevention switching unit comprises: a sixth resistor and a third switching tube; wherein, the liquid crystal display device comprises a liquid crystal display device,
the control end of the third switching tube is connected with the driving switching unit, the first end of the third switching tube is connected with the main power supply module, the second end of the third switching tube is connected with the load port, and the sixth resistor is connected in series between the control end and the second end of the third switching tube.
8. The anti-reverse flow circuit of any of claims 1-7, wherein the backup power module comprises: the first diode, the second diode, the first capacitor and the isolation transformer; wherein, the liquid crystal display device comprises a liquid crystal display device,
the input end of the isolation transformer is used for being connected with the backup battery pack, the first output end of the isolation transformer is connected with the first diode in series and then is connected with the anode of the second diode, the second output end of the isolation transformer is grounded, the cathode of the second diode is connected with the load port, the first end of the first capacitor is connected with the anode of the second diode, and the second end of the first capacitor is grounded.
9. The anti-reverse flow circuit according to any one of claims 1 to 7, further comprising:
and the output voltage stabilizing module is connected with the load port and is used for stabilizing the voltage of the load port.
10. A power supply apparatus, characterized by comprising: a driver, further comprising: a backflow prevention circuit as claimed in any one of claims 1 to 9; the load port of the anti-backflow circuit is connected with the driver.
CN202223468420.1U 2022-12-21 2022-12-21 Anti-backflow circuit and power supply equipment Active CN219227457U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202223468420.1U CN219227457U (en) 2022-12-21 2022-12-21 Anti-backflow circuit and power supply equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202223468420.1U CN219227457U (en) 2022-12-21 2022-12-21 Anti-backflow circuit and power supply equipment

Publications (1)

Publication Number Publication Date
CN219227457U true CN219227457U (en) 2023-06-20

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ID=86756130

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202223468420.1U Active CN219227457U (en) 2022-12-21 2022-12-21 Anti-backflow circuit and power supply equipment

Country Status (1)

Country Link
CN (1) CN219227457U (en)

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