Circuit for inputting forward and reverse direct current and outputting forward direct current

Abstract

The utility model provides a circuit for inputting forward and reverse direct current and outputting forward direct current, which comprises an input interface CN1, an output interface CN2, an input power supply reverse connection detection circuit consisting of a diode D1, a relay K1 coil and a relay K2 coil, and a direction adjustment circuit consisting of a relay K1 movable and static contact and a relay K2 movable and static contact, the output control circuit is composed of a diode D2, a relay K3 and a control interface CN3, and the output holding circuit is composed of a relay K4. When the input direct-current power supply access circuit detects reverse connection through the input power supply reverse connection detection circuit, the direction of the power supply is adjusted to be forward through the direction adjusting circuit. The direct-current power supply direction is adjusted through the relay, the structure is simple, the conduction voltage drop is low, the reliability is high, and the cost is low; the switch for controlling output is externally connected to the outside of the electric equipment through the interface, so that the operation is convenient; through an external switch device, manual control output and automatic output functions can be realized through inching and normally-closed difference.

Description

Technical Field

[0001] The utility model relates to a circuit, in particular to a circuit that inputs positive and negative direct current and outputs positive direct current. Background Art

[0002] At present, in order to ensure that the DC circuit will not be damaged due to incorrect wiring, resulting in the reverse connection of the DC power supply to the circuit, the technologies adopted are mainly divided into two categories: one is through the structural design of the power supply interface, which can only allow the connector to be inserted in one direction, ensuring that the DC power supply will not be reversely connected to the circuit; the other is a unidirectional conductive device similar to a diode that cuts off the reverse-connected DC resistance at the interface. Due to the forward voltage drop of the diode, when the input power supply reaches the electrical equipment, the power supply has already deviated. The main problems of the above technologies are that in the electrical usage scenarios without an anti-reverse plug connector, only diodes can be used to ensure the forward connection of the power supply. After the DC power supply is reversely connected to the circuit, the circuit cannot work properly. After the DC power supply is correctly connected to the circuit, there will be a certain voltage drop, resulting in a deviation in the circuit power supply. In order to compensate for the voltage drop, it is necessary to adjust the input of the DC power supply, increasing the risk of equipment damage caused by overshoot due to power supply adjustment and increasing the technical difficulty. Content of the Utility Model

[0003] To solve the above problems, the purpose of the utility model is to provide a circuit that inputs positive and negative direct current and outputs positive direct current. Through this circuit, the problem of circuit damage caused by incorrect wiring in the DC circuit is effectively solved. At the same time, the circuit is simple in structure, has a low voltage drop, low cost, and high reliability.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A circuit that inputs positive and reverse direct current and outputs positive direct current, comprising an input interface CN1, an output interface CN2, a diode D1, a relay K1, a relay K2, a diode D2, a relay K3, a control interface CN3, and a relay K4; the negative electrode of the diode D1 is connected to the positive electrode of the input interface CN1, and the positive electrode of the diode D1 is respectively connected to one end of the coil K1.3 of the relay K1 and one end of the coil K2.3 of the relay K2; the other end of the coil K1.3 of the relay K1 and the other end of the coil K2.3 of the relay K2 are both connected to the negative electrode of the input interface CN1; one end of the normally closed contact K1.1 of the relay K1 is connected to the positive electrode of the input interface CN1, one end of the normally open contact K1.2 of the relay K1 is connected to the negative electrode of the input interface CN1, and the other end of the normally closed contact K1.1 of the relay K1 and the other end of the normally open contact K1.2 of the relay K1 are connected together to form a first common contact; one end of the normally closed contact K2.1 of the relay K2 is connected to the negative electrode of the input interface CN1, one end of the normally open contact K2.2 of the relay K2 is connected to the positive electrode of the input interface CN1, and the other end of the normally closed contact K2.1 of the relay K2 and the other end of the normally open contact K2.2 of the relay K2 are connected together to form a second common contact; the control interface CN3 is externally connected with a push-button switch, the first connection point of the control interface CN3 is connected to the first common contact, and the second connection point of the control interface CN3 is respectively connected to the positive electrode of the diode D2 and the positive electrode of the output interface CN2; one end of the coil K3.3 of the relay K3 and one end of the coil K4.3 of the relay K4 are both connected to the negative electrode of the diode D2, and the other end of the coil K3.3 of the relay K3 and the other end of the coil K4.3 of the relay K4 are both connected to the second common contact; one end of the normally open contact K3.2 of the relay K3 is connected to the second common contact, and the other end is connected to the negative electrode of the output interface CN2; both ends of the normally open contact K4.2 of the relay K4 are respectively connected to the first connection point and the second connection point of the control interface CN3.

[0006] Further, the diode D1, the coil of the relay K1, and the coil of the relay K2 form an input power reverse connection detection circuit for detecting whether the input power supply is reversely connected; the moving and static contacts of the relay K1 and the relay K2 form a direction adjustment circuit for changing the direction of the reversely connected input power supply to the positive direction. The moving and static contacts of the relay K1 include the normally closed contact K1.1 and the normally open contact K1.2 of the relay K1, and the moving and static contacts of the relay K2 include the normally closed contact K2.1 and the normally open contact K2.2 of the relay K1; the diode D2, the relay K3, and the control interface CN3 form an output control circuit for controlling the on-off of the circuit; the relay K4 constitutes an output holding circuit. When the input direct current power supply is connected to the circuit through the input interface CN1, after being detected by the input power reverse connection detection circuit, when the input direct current power supply is reversely connected, the power supply direction is adjusted to the positive direction through the direction adjustment circuit.

[0007] Furthermore, the circuit for the input positive and negative direct current to output positive direct current further includes an input power reverse connection indication circuit and a positive output indication circuit; the input power reverse connection indication circuit consists of a resistor R1 and a light-emitting diode LED1. One end of the resistor R1 is connected to the positive pole of the input interface CN1, the other end of the resistor R1 is connected to the negative pole of the light-emitting diode LED1, and the positive pole of the light-emitting diode LED1 is connected to the negative pole of the input interface CN1; the positive output indication circuit consists of a resistor R2 and a light-emitting diode LED2. One end of the resistor R2 is connected to the second connection point of the control interface CN3, the other end of the resistor R2 is connected to the positive pole of the light-emitting diode LED2, and the negative pole of the light-emitting diode LED2 is connected to the negative pole of the output interface CN2. Due to the unidirectional conduction characteristic of the diode, the input power reverse connection indication circuit and the positive output indication circuit can indicate the states of input power reverse connection and positive power output.

[0008] Furthermore, the input power reverse connection detection circuit further includes a diode D3 for freewheeling. The positive pole of the diode D3 is connected to the positive pole of the diode D1, and the negative pole of the diode D3 is connected to the negative pole of the input interface CN1; the output control circuit further includes a diode D4 for freewheeling. The negative pole of the diode D4 is connected to the negative pole of the diode D2, and the positive pole of the diode D4 is connected to the second common connection point.

[0009] Furthermore, the circuit for the input positive and negative direct current to output positive direct current further includes a filtering circuit. The filtering circuit consists of an energy storage filtering capacitor C1. One end of the energy storage filtering capacitor C1 is connected to the second connection point of the control interface CN3, and the other end is connected to the negative pole of the output interface CN2. The filtering circuit stores energy and filters the input power to improve the quality of the DC power supply.

[0010] Furthermore, the power supply input by the input interface CN1 and the power supply output by the output interface CN2 are both direct current, such as 5V, 12V, 24V direct current.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The present utility model adjusts the direction of the DC power supply through a relay, with a simple structure, low conduction voltage drop, high reliability, and low cost; the control output switch is externally connected to the outside of the electrical equipment through an interface, which is convenient for operation; through an externally connected switching device, the functions of manual control output and automatic output can be realized by distinguishing between momentary contact and normally closed. Description of the Drawings

[0013] The following further describes the present utility model in detail with reference to the drawings.

[0014] Figure 1 It is the control logic diagram of the circuit described in the present utility model.

[0015] Figure 2 This is the circuit schematic diagram of the circuit described in the present utility model when no power supply is connected.

[0016] Figure 3 This is the circuit schematic diagram of the circuit described in the present utility model when the power supply is connected in the forward direction.

[0017] Figure 4 This is the circuit schematic diagram of the circuit described in the present utility model when the power supply is connected in the reverse direction.

[0018] Figure 5 This is the physical connection diagram of the circuit described in the present utility model.

[0019] As shown in the figure:

[0020] C1 Energy storage and filtering capacitor;

[0021] CN1 Input interface;

[0022] CN2 Output interface;

[0023] CN3 Control interface;

[0024] D1, D2, D3, D4 Diodes;

[0025] K1, K2, K3, K4 Relays;

[0026] K1.1 Normally closed contact of relay K1;

[0027] K1.2 Normally open contact of relay K1;

[0028] K1.3 Coil of relay K1;

[0029] K2.1 Normally closed contact of relay K2;

[0030] K2.2 Normally open contact of relay K2;

[0031] K2.3 Coil of relay K2;

[0032] K3.2 Normally open contact of relay K3;

[0033] K3.3 Coil of relay K3;

[0034] K4.2 Normally open contact of relay K4;

[0035] K4.2 Coil of relay K4;

[0036] LED1, LED2 Light-emitting diodes;

[0037] R1, R2 Resistors. Detailed implementation manners

[0038] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0040] In the present utility model, the energy storage and filtering capacitors C1, input interface CN1, output interface CN2, control interface CN3, diodes D1 - D4, relays K1 - K4, light - emitting diodes LED1 and LED2, and resistors R1 and R2 of each electrical component are all existing components; the relay has a normally - closed contact, a normally - open contact, and a coil. The normally - closed contact and the normally - open contact of the relay both have two endpoints, namely the moving contact and the static contact, and the connection or disconnection is achieved through the dynamic connection or disconnection of the moving contact and the static contact; the light - emitting diode and the diode have positive and negative poles. Embodiment 1

[0041] As Figure 1 shown in Figure 2 This embodiment provides a circuit that inputs positive and negative direct current and outputs positive direct current, which includes an input interface CN1 for inputting power, an output interface CN2 for outputting power, an input power reverse - connection detection circuit composed of diode D1, relay K1 coil, and relay K2 coil, a direction - adjustment circuit composed of the moving and static contacts of relay K1 and the moving and static contacts of relay K2, an output control circuit composed of diode D2, relay K3, and control interface CN3, and an output holding circuit composed of relay K4.

[0042] The input end of the input interface CN1 is connected to the power supply, and the output end of the input interface CN1 has three contacts, namely positive electrode VIN +, negative electrode VIN -, and ground contact PE.

[0043] The output end of the output interface CN2 is connected to the load, and the input end of the output interface CN2 has three contacts, namely positive electrode VOUT +, negative electrode VOUT -, and ground contact PE.

[0044] In the input power reverse connection detection circuit, the negative electrode of diode D1 is connected to the positive electrode of input interface CN1, and the positive electrode of diode D1 is respectively connected to one end of relay K1 coil K1.3 and one end of relay K2 coil K2.3; the other end of relay K1 coil K1.3 and the other end of relay K2 coil K2.3 are both connected to the negative electrode of input interface CN1.

[0045] In the direction adjustment circuit, relay K1 has a normally closed contact K1.1, a normally open contact K1.2 and a coil K1.3 of relay K1; relay K2 has a normally closed contact K2.1, a normally open contact K2.2 and a coil K2.3 of relay K2; the moving and static contacts of relay K1 are the normally closed contact K1.1 and the normally open contact K1.2 of relay K1; the moving and static contacts of relay K2 are the normally closed contact K2.1 and the normally open contact K2.2 of relay K2.

[0046] One end (normally closed end) of the normally closed contact K1.1 of relay K1 is connected to the positive electrode of input interface CN1, one end (normally open end) of the normally open contact K1.2 of relay K1 is connected to the negative electrode of input interface CN1, and the other end of the normally closed contact K1.1 of relay K1 and the other end of the normally open contact K1.2 of relay K1 (through a wire) are connected together to form a first common contact point.

[0047] One end (normally closed end) of the normally closed contact K2.1 of relay K2 is connected to the negative electrode of input interface CN1, one end (normally open end) of the normally open contact K2.2 of relay K2 is connected to the positive electrode of input interface CN1, and the other end of the normally closed contact K2.1 of relay K2 and the other end of the normally open contact K2.2 of relay K2 (through a wire) are connected together to form a second common contact point.

[0048] In the output control circuit, a push-button switch (momentary switch) is externally connected to control interface CN3 (with two connection points). The first connection point of control interface CN3 is connected to the first common contact point. The second connection point of control interface CN3 is respectively connected to the positive electrode of diode D2 and the positive electrode of output interface CN2; relay K3 has a coil K3.3 and a normally open contact K3.2 of relay K3; one end of coil K3.3 of relay K3 is connected to the negative electrode of diode D2, and the other end of coil K3.3 of relay K3 is connected to the second common contact point; one end (common end) of the normally open contact K3.2 of relay K3 is connected to the second common contact point, and the other end (normally open end) of the normally open contact K3.2 of relay K3 is connected to the negative electrode of output interface CN2.

[0049] In the output holding circuit, the relay K4 has a normally open contact K4.2 and a relay coil K4.3 of the relay K4; one end of the relay coil K4.3 of the relay K4 is connected to the negative electrode of the diode D2, and the other end of the relay coil K4.3 of the relay K4 is connected to the second common contact point; one end of the normally open contact K4.2 of the relay K4 is connected to the first connection point of the control interface CN3, and the other end of the normally open contact K4.2 of the relay K4 is connected to the second connection point of the control interface CN3.

[0050] Working principle:

[0051] (1) When a positive DC power is input, as Figure 3 shown, when the input interface CN1 accesses a positive 24V DC power, due to the cut-off effect of the diode D1 (the diode D1 is in the cut-off state because the power supply direction is positive and opposite to its wiring direction), the input power reverse connection detection circuit is not powered on, and the normally closed contacts K1.1 of the relay K1 and the normally closed contacts K2.1 of the relay K2 both remain closed. Press the push-button switch connected to the control interface CN3 to connect the wire between the first common contact point and the positive electrode of the diode D2. The diode D2 is powered on and conducts (its wiring direction is the same as the power supply direction), the output control circuit is powered on, so that the relay coil K3.3 of the relay K3 is powered on, and the normally open contact K3.2 of the relay K3 closes and conducts, conducting the positive power supply to the output interface CN2 to output a positive power supply; at the same time, the relay coil K4.3 of the relay K4 is powered on, and the normally open contact K4.2 of the relay K4 closes and conducts to maintain the circuit output.

[0052] (2) When a reverse DC power is input, as Figure 4 shown, when the input interface CN1 accesses a reverse 24V DC power, since the diode D1 conducts (the diode D1 is in the conducting state because the power supply direction is reverse and the same as its wiring direction), the relay coils K1.3 of the relay K1 and the relay coils K2.3 of the relay K2 in the input power reverse connection detection circuit are both powered on. At this time, in the direction adjustment circuit, the normally closed contacts K1.1 of the relay K1 and the normally closed contacts K2.1 of the relay K2 are disconnected, and the normally open contacts K1.2 of the relay K1 and the normally open contacts K2.2 of the relay K2 are closed, thereby adjusting the power supply direction to be positive. After adjusting the power supply direction to be positive, press the push-button switch connected to the control interface CN3 to connect the wire between the first common contact point and the positive electrode of the diode D2. The diode D2 is powered on and conducts (its wiring direction is the same as the power supply direction adjusted to be positive), the output control circuit is powered on, so that the relay coil K3.3 of the relay K3 is powered on, and the normally open contact K3.2 of the relay K3 closes and conducts, conducting the positive power supply adjusted from reverse to positive to the output interface CN2 to output a positive power supply; at the same time, the relay coil K4.3 of the relay K4 is powered on, and the normally open contact K4.2 of the relay K4 closes and conducts to maintain the circuit output.

[0053] If the reverse power supply is connected to the input interface CN1, since the wiring direction of the diode D2 is opposite to the power supply, the diode D2 is in the cut-off state. Before the input power supply reverse connection detection circuit is powered on, the coil K3.3 of the relay K3 cannot be powered on, and the normally open contact K3.2 of the relay K3 cannot be closed, ensuring that when the push-button switch externally connected to the control interface CN3 acts at the moment of power-on, no reverse DC power supply will be output. Embodiment 2

[0054] In order to clearly indicate the states of the input power supply reverse connection and the positive direction of the power output, the following settings are made based on Embodiment 1 in this embodiment:

[0055] The circuit for outputting positive DC power from the input positive and negative DC also includes an input power supply reverse connection indication circuit and a positive output indication circuit.

[0056] The input power supply reverse connection indication circuit is composed of a resistor R1 and a light-emitting diode LED1. One end of the resistor R1 is connected to the positive pole of the input interface CN1, the other end of the resistor R1 is connected to the negative pole of the light-emitting diode LED1, and the positive pole of the light-emitting diode LED1 is connected to the negative pole of the input interface CN1. When the positive power supply (correct connection) is connected to the input interface CN1, the wiring direction of the light-emitting diode LED1 is opposite to the power supply direction, so it is in the cut-off state, and the input power supply reverse connection indication circuit is not powered on, and the light-emitting diode LED1 does not emit light. When the reverse power supply (reverse connection) is connected to the input interface CN1, the wiring direction of the light-emitting diode LED1 is the same as the power supply direction, so it is in the conducting state, and the input power supply reverse connection indication circuit is powered on, and the light-emitting diode LED1 emits light, indicating that the input power supply is in the reverse connection state.

[0057] The positive output indication circuit is composed of a resistor R2 and a light-emitting diode LED2; one end of the resistor R2 is connected to the second connection point of the control interface CN3, the other end of the resistor R2 is connected to the positive pole of the light-emitting diode LED2, and the negative pole of the light-emitting diode LED2 is connected to the negative pole of the output interface CN2; when the input power supply is correctly connected and the push-button switch of the control interface CN3 acts, the power supply direction output to the positive output indication circuit is positive, which is consistent with the wiring direction of the light-emitting diode LED2, and the positive output indication circuit is powered on, and the light-emitting diode LED1 conducts and emits light, indicating that the output power supply is in the positive output state. When the input power supply is reversely connected, the input power supply reverse connection detection circuit is powered on, and the power supply direction is adjusted to positive by using the direction adjustment circuit, so that the power supply direction output to the positive output indication circuit is also positive, which is consistent with the wiring direction of the light-emitting diode LED2, and the positive output indication circuit is powered on, and the light-emitting diode LED1 conducts and emits light, indicating that the output power supply is in the positive output state. Embodiment 3

[0058] In order to store energy and filter the input power supply and improve the quality of the DC power supply, the following settings are made based on Embodiment 1 or Embodiment 2 in this embodiment:

[0059] The circuit for the input positive and negative direct current to output positive direct current further includes a filter circuit, which is composed of an energy storage filter capacitor C1. One end of the energy storage filter capacitor C1 is connected to the second connection point of the control interface CN3, and the other end is connected to the negative pole of the output interface CN2. Embodiment 4

[0060] Since the relay coil will store energy and there is a reverse voltage when it is disconnected, which needs to be discharged to avoid damaging other components, it is necessary to carry out freewheeling to avoid sudden changes in the load current and play a role in smoothing the current. The following settings are made based on any one of Embodiments 1-3 in this embodiment:

[0061] The input power supply reverse connection detection circuit further includes a diode D3 for freewheeling. The positive pole of the diode D3 is connected to the positive pole of the diode D1, and the negative pole of the diode D3 is connected to the negative pole of the input interface CN1.

[0062] The output control circuit further includes a diode D4 for freewheeling. The negative pole of the diode D4 is connected to the negative pole of the diode D2, and the positive pole of the diode D4 is connected to the second common connection point.

[0063] Other details not elaborated in this utility model are all conventional techniques well known to those skilled in the art.

[0064] It should be noted that the term "comprising", "including" or any other variant is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0065] The protection scope of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modification, equivalent replacement, improvement, etc. made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A circuit for inputting forward and reverse direct current and outputting forward direct current, comprising an input interface CN1, an output interface CN2, a diode D1, a relay K1, a relay K2, a diode D2, a relay K3, a control interface CN3 and a relay K4; characterized in that: The cathode of the diode D1 is connected to the anode of the input interface CN1, and the anode of the diode D1 is connected to one end of the coil K1.3 of the relay K1 and one end of the coil K2.3 of the relay K2 respectively; the other end of the coil K1.3 of the relay K1 and the other end of the coil K2.3 of the relay K1 are both connected to the cathode of the input interface CN1; One end of the normally closed contact K1.1 of the relay K1 is connected to the positive electrode of the input interface CN1, one end of the normally open contact K1.2 of the relay K1 is connected to the negative electrode of the input interface CN1, and the other end of the normally closed contact K1.1 of the relay K1 and the other end of the normally open contact K1.2 of the relay K1 are connected together to form a first common contact; One end of the normally closed contact K2.1 of the relay K2 is connected to the negative electrode of the input interface CN1, one end of the normally open contact K2.2 of the relay K2 is connected to the positive electrode of the input interface CN1, and the other end of the normally closed contact K2.1 of the relay K2 is connected to the other end of the normally open contact K2.2 of the relay K2 to form a second common contact; The control interface CN3 is externally connected to a button switch, the first connection point of the control interface CN3 is connected to the first common connection point, and the second connection point of the control interface CN3 is respectively connected to the positive electrode of the diode D2 and the positive electrode of the output interface CN2; One end of the relay K3 coil K3.3 and one end of the relay K4 coil K4.3 are both connected to the cathode of the diode D2, and the other end of the relay K3 coil K3.3 and the other end of the relay K4 coil K4.3 are both connected to the second common contact; one end of the relay K3 normally open contact K3.2 is connected to the second common contact, and the other end is connected to the cathode of the output interface CN2; the two ends of the relay K4 normally open contact K4.2 are respectively connected to the first wiring point and the second wiring point of the control interface CN3.

2. The circuit for inputting positive and negative direct current and outputting positive direct current according to claim 1, characterized in that: The diode D1, the relay K1 coil and the relay K2 coil constitute an input power reverse connection detection circuit; the relay K1 and the relay K2 moving and static contacts constitute a direction adjustment circuit, the relay K1 moving and static contacts include the relay K1 normally closed contact K1.1 and the relay K1 normally open contact K1.2, the relay K2 moving and static contacts include the relay K2 normally closed contact K2.1 and the relay K1 normally open contact K2.2; the diode D2, the relay K3 and the control interface CN3 constitute an output control circuit; the relay K4 constitutes an output holding circuit.

3. The circuit for inputting positive and negative direct current and outputting positive direct current according to claim 2, characterized in that: The circuit for inputting positive and negative direct current and outputting positive direct current also includes an input power reverse connection indication circuit and a positive output indication circuit; The input power reverse connection indication circuit is composed of a resistor R1 and a light emitting diode LED1, one end of the resistor R1 is connected to the positive electrode of the input interface CN1, the other end of the resistor R1 is connected to the negative electrode of the light emitting diode LED1, and the positive electrode of the light emitting diode LED1 is connected to the negative electrode of the input interface CN1; The forward output indication circuit is composed of a resistor R2 and a light-emitting diode LED2; one end of the resistor R2 is connected to the second connection point of the control interface CN3, the other end of the resistor R2 is connected to the positive electrode of the light-emitting diode LED2, and the negative electrode of the light-emitting diode LED2 is connected to the negative electrode of the output interface CN2.

4. The circuit for inputting positive and negative direct current and outputting positive direct current according to claim 2, characterized in that: The input power reverse connection detection circuit further includes a diode D3 for freewheeling, wherein the anode of the diode D3 is connected to the anode of the diode D1, and the cathode of the diode D3 is connected to the cathode of the input interface CN1; The output control circuit further includes a diode D4 for freewheeling, wherein a cathode of the diode D4 is connected to a cathode of the diode D2, and an anode of the diode D4 is connected to a second common point.

5. The circuit for inputting positive and negative direct current and outputting positive direct current according to claim 1, characterized in that: It also includes a filter circuit, which is composed of an energy storage filter capacitor C1. One end of the energy storage filter capacitor C1 is connected to the second wiring point of the control interface CN3, and the other end is connected to the negative electrode of the output interface CN2.

6. The circuit for inputting forward and reverse direct current and outputting forward direct current according to any one of claims 1 to 5, characterized in that: The power input by the input interface CN1 and the power output by the output interface CN2 are both direct current.

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