A DC self-holding electronic switch module

Abstract

The invention discloses a direct current self-holding electronic switch module, comprising an overcurrent and short circuit protection circuit, a module closing control circuit, a module opening control circuit, a main circuit switch circuit, an auxiliary circuit switch circuit, an anti-reverse charging circuit, an input interface Pin, an output interface Pout and a control signal interface P1; the invention has the characteristics of simple circuit, high reliability, low self-power consumption, small size, light weight, low cost, good impact resistance and the like, and can be used in small lithium primary batteries that need to withstand high impact.

Description

Technical Field

[0001] The invention belongs to the field of switch control, and in particular relates to a direct current self-holding electronic switch module. Background Art

[0002] In a lithium primary battery pack, a switch device is required that is impact-resistant, has a short-circuit protection function, has low power consumption, has a low driving signal power, can self-maintain a switch state, and has a short-circuit protection function.

[0003] The function of this device is that when the lithium primary battery pack is stored for a long time, the battery output is turned off, and the switching device has low power consumption and small self-consumption; when in use, it is turned on or off by an electrical signal, and the device works and the switch state can be maintained after the on or off signal is sent, so that the power consumption of the on signal is reduced; when an output short circuit occurs, the switch can immediately close the main circuit to protect the main circuit devices; at the same time, it needs to meet the requirements of high impact resistance during transportation and use.

[0004] At present, the commonly used technical means is to use aerospace-grade self-holding relays as switches, which brings several problems: first, the self-holding relay driving signal power is high and the driving signal requirements are high; second, the self-holding relay does not have a short-circuit protection function; third, the aerospace-grade self-holding relay is large in size. In order to solve these problems, a DC self-holding electronic switch module with a short-circuit protection function was developed. Summary of the invention

[0005] The object of the present invention is to provide a direct current self-holding electronic switch module with a short-circuit protection function that can be used in a high-impact environment and is suitable for a low-voltage, low-power lithium primary battery pack.

[0006] The technical scheme adopted by the present invention to solve the technical problem is: a direct current self-holding electronic switch module, comprising an overcurrent and short-circuit protection circuit, a module closing control circuit, a module opening control circuit, a main circuit switch circuit, an auxiliary circuit switch circuit, an anti-reverse charging circuit, an input interface Pin, an output interface Pout and a control signal interface P1; Pin 1 of the input interface Pin is a positive input, and Pin 2 is a negative input; Pin 1 of the output interface Pout is a positive input, and Pin 2 is a negative input; Pin 1 of the control signal interface P1 is a positive closing signal, Pin 3 is a positive opening signal, and Pin 2 is a negative control signal; the overcurrent and short-circuit protection circuit adopts a resistor and a triode to form a short-circuit feedback circuit, and a MOS tube is used to realize a short-circuit disconnection circuit; the module opening control circuit and the module closing control circuit realize isolation of the control circuit and the main circuit through an optical coupler; the main circuit switch circuit adopts a resistor voltage divider and a MOS tube to realize main circuit switch control; the auxiliary circuit switch circuit realizes that the main circuit switch is kept after the control signal disappears through the MOS tube and the voltage divider circuit; the anti-reverse charging circuit adopts a diode for reverse charging protection, and uses a resistor for filtering.

[0007] The DC self-holding electronic switch module, whose overcurrent and short-circuit protection circuit includes a resistor R10, a recoverable fuse F1 and a transistor Q3, wherein the base and collector of the transistor Q3 are respectively connected to the first pin and the second pin of the resistor R10, the first pin of the recoverable fuse F1 is connected to the base of the transistor Q3, the second pin of the recoverable fuse F1 is connected to the source of the MOS tube in the main loop switch circuit, the emitter of the transistor Q3 is connected to the gate of the MOS tube in the main loop switch circuit, and the collector of the transistor Q3 is connected to pin 1 of the input interface Pin.

[0008] The DC self-holding electronic switch module has a module switch control circuit including resistors R1-R2, capacitor C1 and optocoupler U1, the first pin of resistor R1 is connected to the first pin of resistor R2 and pin 1 of control signal interface P1, the second pin of resistor R1 is connected to the first pin of capacitor C1, the second pin of resistor R2 is connected to the second pin of capacitor C1 and pin 2 of control signal interface P1, the positive and negative pins of the source end of optocoupler U1 are respectively connected to the first and second pins of capacitor C1, and the positive and negative poles of the secondary end of optocoupler U1 are respectively connected to the source and gate of MOS tube in the main loop switch circuit.

[0009] The DC self-holding electronic switch module has a module opening control circuit including resistors R5-R6, a capacitor C2 and an optical coupler U2, wherein the first pin of the resistor R5 is connected to the first pin of the resistor R6 and the 3rd pin of the control signal interface P1, the second pin of the resistor R5 is connected to the first pin of the capacitor C2, the second pin of the resistor R6 is connected to the second pin of the capacitor C2 and the 2nd pin of the control signal interface P1, the positive and negative pins of the source end of the optical coupler U2 are respectively connected to the first pin and the second pin of the capacitor C2, the positive and negative poles of the secondary end of the optical coupler U2 are respectively connected to the drain and source of the MOS tube in the module opening control circuit, and the negative pole of the secondary end of the optical coupler U2 is connected to the 2nd pin of the input connector Pin.

[0010] The DC self-holding electronic switch module has a main loop switch circuit comprising resistors R3-R4, a voltage regulator D2, and a MOS tube Q1. The first pin of the resistor R3 is connected to the source of the MOS tube Q1 and the negative electrode of the voltage regulator D2, and the second pin of the resistor R3 is connected to the gate of the MOS tube Q1, the positive electrode of the voltage regulator D2, and the first pin of the resistor R4.

[0011] The auxiliary loop switch circuit of the DC self-holding electronic switch module includes resistors R7-R8, capacitor C3 and MOS tube Q2, the first pin of resistor R7 is connected to the drain of MOS tube Q1 in the main loop switch circuit, the second pin is connected to the gate of MOS tube Q2 and the first pin of resistor R8, the second pin of resistor R8 is connected to the source of MOS tube Q2, capacitor C3 is connected in parallel with resistor R8, and the source of MOS tube Q2 is connected to the negative electrode of the secondary end of optocoupler U2 in the module opening control circuit.

[0012] The DC self-holding electronic switch module has an anti-reverse charging circuit comprising a diode D1 and a resistor R9, wherein the positive electrode of the diode D1 is connected to the drain of the MOS tube Q1 in the main loop switch circuit, the negative electrode of the diode D1 is connected to the pin 1 of the output interface Pout and the first pin of the resistor R9, and the second pin of the resistor R9 is connected to the pin 2 of the output interface Pout and the source of the MOS tube Q2 in the auxiliary loop switch circuit.

[0013] The beneficial effects of the present invention are:

[0014] 1. The present invention turns on or off the electronic switch through an electrical signal, has a simple circuit structure, high reliability, low drive signal power, and a wide drive voltage range.

[0015] 2. The present invention has low power consumption when working and less than 1uA when in standby mode. After being turned on, the module consumes less than 7mA.

[0016] 3. The present invention is small in size, light in weight and easy to install.

[0017] 4. The present invention is composed of common components such as resistors, capacitors, diodes, MOS tubes, and optocouplers, which has low cost and good impact resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the appearance structure of the present invention;

[0019] Figure 2 It is a circuit schematic diagram of the present invention.

[0020] The reference numerals of the figures are as follows: P1—control signal interface, Pin—input interface, Pout—output interface, C1 / C2 / C3—capacitor, Q1 / Q2—MOS tube, Q3—transistor, R1~R10—resistor, D2—voltage regulator tube, D1—diode, U1 / U2—optocoupler, F1—recoverable fuse. DETAILED DESCRIPTION

[0021] The present invention is further described in detail with reference to the accompanying drawings and embodiments as follows.

[0022] Refer to the attached Figure 1As shown, a DC self-holding electronic switch module disclosed in the present invention comprises three interfaces, an input interface Pin, a (2-core) output connector output interface Pout, and a 3-core connector control signal interface P1. Pin 1 of the input interface Pin is the input positive, and pin 2 is the input negative; pin 1 of the output interface Pout is the input positive, and pin 2 is the input negative; pin 1 of the control signal interface P1 is the closing signal positive, pin 3 is the opening signal positive, and pin 2 is the control signal negative.

[0023] Refer to the attached Figure 2 As shown, the present invention also includes an overcurrent and short-circuit protection circuit, a module closing control circuit, a module opening control circuit, a main circuit switch circuit, an auxiliary circuit switch circuit and an anti-reverse charging circuit. The overcurrent and short-circuit protection circuit uses resistors and triodes to form a short-circuit feedback circuit, and a MOS tube is used to realize a short-circuit disconnection circuit; the module opening control circuit and the module closing control circuit use optical coupling to realize the isolation of the control circuit and the main circuit; the main circuit switch circuit uses a resistor voltage divider and a MOS tube to realize the main circuit switch control; the auxiliary circuit switch circuit uses a MOS tube and a voltage divider circuit to realize the main circuit switch maintenance after the control signal disappears; the anti-reverse charging circuit uses a diode for reverse impact protection and uses a resistor for filtering.

[0024] The overcurrent and short-circuit protection circuit includes a resistor R10, a recoverable fuse F1 and a PNP transistor Q3, the base and collector of the transistor Q3 are respectively connected to the first pin and the second pin of the resistor R10, the first pin of the recoverable fuse F1 is connected to the base of the transistor Q3, the second pin of the recoverable fuse F1 is connected to the source of the MOS tube in the main loop switch circuit, the emitter of the transistor Q3 is connected to the gate of the MOS tube in the main loop switch circuit, and the collector of the transistor Q3 is connected to pin 1 of the input connector interface Pin.

[0025] The module switch control circuit comprises resistors R1 and R2, capacitor C1 and optocoupler U1, wherein the first pin of resistor R1 is connected to the first pin of resistor R2 and pin 1 of control signal interface P1, the second pin of resistor R1 is connected to the first pin of capacitor C1, the second pin of resistor R2 is connected to the second pin of capacitor C1 and pin 2 of control signal interface P1, the positive and negative pins of the source end of optocoupler U1 are respectively connected to the first and second pins of capacitor C1, and the positive and negative poles of the secondary end of optocoupler U1 are respectively connected to the source and gate of MOS tube in the main loop switch circuit.

[0026] The module opening control circuit comprises resistors R5 and R6, a capacitor C2 and an optocoupler U2, wherein the first pin of the resistor R5 is connected to the first pin of the resistor R6 and the 3rd pin of the control signal interface P1, the second pin of the resistor R5 is connected to the first pin of the capacitor C2, the second pin of the resistor R6 is connected to the second pin of the capacitor C2 and the 2nd pin of the control signal interface P1, the positive and negative pins of the source end of the optocoupler U2 are respectively connected to the first pin and the second pin of the capacitor C2, the positive and negative poles of the secondary end of the optocoupler U2 are respectively connected to the drain and source of the MOS tube in the module opening control circuit, and the negative pole of the secondary end of the optocoupler U2 is connected to the 2nd pin of the input connector interface Pin.

[0027] The main loop switch circuit comprises resistors R3, R4, a voltage regulator diode D2, and a PMOS tube Q1. The first pin of the resistor R3 is connected to the source of the MOS tube Q1 and the negative electrode of the voltage regulator tube D2. The second pin of the resistor R3 is connected to the gate of the MOS tube Q1, the positive electrode of the voltage regulator tube D2, and the first pin of the resistor R4.

[0028] The auxiliary loop switch circuit includes resistors R7, R8, capacitor C3 and NMOS tube Q2. The first pin of resistor R7 is connected to the drain of Q1 in the main loop switch circuit, the second pin is connected to the gate of MOS tube Q2 and the first pin of resistor R8, the second pin of resistor R8 is connected to the source of MOS tube Q2, the capacitor C3 is connected to the resistor R8 in parallel, and the source of MOS tube Q2 is connected to the negative electrode of the secondary end of optocoupler U2 in the module opening control circuit.

[0029] The anti-reverse charging circuit includes a common diode D1 and a resistor R9. The positive electrode of the diode D1 is connected to the drain of the MOS tube Q1 in the main circuit switch circuit. The positive and negative electrodes of the diode D1 are respectively connected to pin 1 of the output connector output interface Pout and the first pin of the resistor R9. The second pin of the resistor R9 is connected to pin 2 of the output connector output interface Pout and the source of the MOS tube Q2 in the auxiliary circuit switch circuit.

[0030] The basic functions of this switch module are: after the switch module is connected to the battery pack, when the closing or disconnecting signal is input, the switch module circuit is connected or disconnected, and the battery pack can output or disconnect to the outside. When the closing or disconnecting signal stops, the module's external output state can be maintained. At the same time, when the module output has an overcurrent or short circuit, the module can disconnect the circuit and recover after powering on again.

[0031] The above embodiments are only illustrative of the principles and effects of the present invention, as well as some embodiments of its application. For those skilled in the art, several modifications and improvements may be made without departing from the creative concept of the present invention, and all of these belong to the protection scope of the present invention.

Claims

1. A DC self-holding electronic switch module, characterized in that: It includes overcurrent and short circuit protection circuit, module closing control circuit, module opening control circuit, main circuit switch circuit, auxiliary circuit switch circuit, anti-reverse charging circuit, input interface Pin, output interface Pout and control signal interface P1; The over-current and short-circuit protection circuit uses a resistor and a triode to form a short-circuit feedback circuit, and the short-circuit disconnection loop is realized by a MOS tube; The module on control circuit and the module off control circuit achieve isolation between the control loop and the main loop through an optical coupler. The module off control circuit includes resistors R1-R2, capacitor C1 and an optical coupler U1. The first pin of the resistor R1 is connected to the first pin of the resistor R2 and pin 1 of the control signal interface P1, the second pin of the resistor R1 is connected to the first pin of the capacitor C1, the second pin of the resistor R2 is connected to the second pin of the capacitor C1 and pin 2 of the control signal interface P1, the positive and negative pins of the source end of the optical coupler U1 are respectively connected to the first pin and the second pin of the capacitor C1, and the positive and negative poles of the secondary end of the optical coupler U1 are respectively connected to the source and gate of the MOS tube in the main loop switch circuit; The main circuit switch circuit adopts resistor voltage division and MOS tube to realize the main circuit switch control; The auxiliary loop switch circuit includes resistors R7-R8, capacitor C3 and MOS tube Q2, the first pin of resistor R7 is connected to the drain of MOS tube Q1 in the main loop switch circuit, the second pin is connected to the gate of MOS tube Q2 and the first pin of resistor R8, the second pin of resistor R8 is connected to the source of MOS tube Q2, capacitor C3 is connected in parallel with resistor R8, the source of MOS tube Q2 is connected to the negative electrode of the secondary end of optocoupler U2 in the module opening control circuit, and the auxiliary loop switch circuit realizes the main loop switch maintenance after the control signal disappears through the MOS tube and the voltage divider circuit; The anti-reverse charging circuit comprises a diode D1 and a resistor R9, wherein the positive electrode of the diode D1 is connected to the drain of the MOS tube Q1 in the main circuit switch circuit, the negative electrode of the diode D1 is connected to the 1st pin of the output interface Pout and the first pin of the resistor R9, and the second pin of the resistor R9 is connected to the 2nd pin of the output interface Pout and the source of the MOS tube Q2 in the auxiliary circuit switch circuit. The anti-reverse charging circuit uses a diode for reverse charging protection and uses a resistor for filtering; The overcurrent and short-circuit protection circuit includes a resistor R10, a recoverable fuse F1 and a transistor Q3, the base and collector of the transistor Q3 are respectively connected to the first pin and the second pin of the resistor R10, the first pin of the recoverable fuse F1 is connected to the base of the transistor Q3, the second pin of the recoverable fuse F1 is connected to the source of the MOS tube in the main circuit switch circuit, the emitter of the transistor Q3 is connected to the gate of the MOS tube in the main circuit switch circuit, and the collector of the transistor Q3 is connected to pin 1 of the input interface Pin; The module opening control circuit includes resistors R5-R6, capacitor C2 and optocoupler U2, the first pin of resistor R5 is connected to the first pin of resistor R6 and pin 3 of control signal interface P1, the second pin of resistor R5 is connected to the first pin of capacitor C2, the second pin of resistor R6 is connected to the second pin of capacitor C2 and pin 2 of control signal interface P1, the positive and negative pins of the source end of optocoupler U2 are respectively connected to the first pin and the second pin of capacitor C2, the positive and negative electrodes of the secondary end of optocoupler U2 are respectively connected to the drain and source of MOS tube in the module opening control circuit, and the negative electrode of the secondary end of optocoupler U2 is connected to pin 2 of input interface Pin; The main loop switch circuit includes resistors R3-R4, a voltage regulator D2, and a MOS tube Q1. The first pin of the resistor R3 is connected to the source of the MOS tube Q1 and the negative electrode of the voltage regulator D2, and the second pin of the resistor R3 is connected to the gate of the MOS tube Q1, the positive electrode of the voltage regulator D2, and the first pin of the resistor R4.

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