Self-powered discharging circuit system and method

Abstract

The invention relates to the technical field of battery discharge, and discloses a self-powered discharge circuit system and method, and the circuit comprises a battery, a load circuit, a control circuit, and an over-discharge protection circuit. The positive electrode end of the battery is connected to a Vin signal end, and the negative electrode end of the battery is connected to a GND signal end; the load circuit and the battery are arranged in parallel, and one end of the load circuit is connected to a Vin end; the other end is connected to a GND signal end; one end of the control circuit is connected with the load circuit, the other end of the control circuit is connected to a voltage signal end, and a grounding end is connected to a GND signal end; one end of the over-discharge protection circuit is connected to a Vin signal end; the other end is connected to the voltage signal end, and the grounding end is connected to the GND signal end. The discharged battery is used for replacing external power supply of the battery discharging circuit to supply power to the control circuit in the design, so that the energy of the discharged battery is utilized, the consumption of external power supply is avoided, and the effect of saving power consumption is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery discharge, and particularly to a self-powered discharge circuit system and method. Background Art

[0002] In the existing technical field of battery discharge, the battery discharge process usually relies on connecting the battery to a discharge circuit composed of key circuit components such as Power Metal-Oxide-Semiconductor Field-Effect Transistors (abbreviated as power MOS transistors). The conventional working mode of this kind of discharge device requires continuous connection to an external power supply to generate a driving signal capable of driving the power MOS transistor of the discharge to operate normally, thereby realizing the discharge control of the battery.

[0003] In battery discharge products with over-discharge protection functions, their working mechanisms are further complicated. Specifically, such products need to use a dedicated controller to collect the current voltage of the battery in real time. The collected voltage data will then be analyzed by software algorithms or judged by hardware circuits. When the battery voltage drops to a pre-set over-discharge protection threshold, the controller will quickly respond and immediately stop the discharge operation of the battery to prevent the battery from being damaged due to over-discharge.

[0004] However, although the above over-discharge protection mechanism can ensure the safe use of the battery to a certain extent, there are still significant deficiencies in the existing technology. Specifically, even after the discharge device has stopped the battery discharge process according to the preset conditions, the entire discharge device system is still in a continuous working state. This unnecessary continuous operation not only causes unnecessary energy waste and increases the use cost of the device, but also because the internal electronic components of the discharge device are continuously heated during the long-term working state, accelerating the aging process of the components and shortening the service life of the device. More critically, if the user fails to notice and actively disconnect the external power supply of the discharge device in time, this inefficient and potentially dangerous working state will continue, bringing potential safety hazards to both the battery and the discharge device itself.

[0005] Therefore, aiming at the problem that the discharge device in the existing battery discharge technology still works continuously after stopping discharge, it is urgent to propose a more efficient, intelligent and safe solution to optimize the battery discharge process, improve the energy utilization efficiency of the device, extend the service life of the device, and ensure the safe and stable operation of the battery and the discharge device. Summary of the Invention

[0006] To overcome the defects of the above-mentioned existing technologies, the purpose of the present invention is to provide a self-powered discharge circuit system and method to solve the technical problem that the discharge device in the existing battery discharge technology still continues to work after stopping discharging.

[0007] The present invention is realized through the following technical solutions: In a first aspect, the present invention provides a self-powered discharge circuit system, including a battery, a load circuit, a control circuit, and an over-discharge protection circuit; The positive terminal of the battery is connected to the Vin signal terminal, and the negative terminal of the battery is connected to the GND signal terminal; The load circuit is arranged in parallel with the battery, and one end of the load circuit is connected to the Vin terminal; the other end is connected to the GND signal terminal; One end of the control circuit is connected to the load circuit, the other end is connected to the voltage signal terminal, and the ground terminal is connected to the GND signal terminal; One end of the over-discharge protection circuit is connected to the Vin signal terminal; the other end is connected to the voltage signal terminal, and the ground terminal is connected to the GND signal terminal.

[0008] Preferably, the load circuit includes a fuse F1, a MOS transistor V1, and a sixth resistor R9; One end of the fuse F1 is connected to the Vin signal terminal; the other end is connected to the first pin (drain) of the MOS transistor V1; the second pin (source) of the MOS transistor V1 is connected to one end of the sixth resistor R9, and the other end of the sixth resistor R9 is connected to the GND signal terminal; The third pin (gate) of the MOS transistor V1 is connected to one end of the control circuit.

[0009] Further, the control circuit includes a first resistor R1, a second resistor R3, a third resistor R4, a first operational amplifier N1A, a second operational amplifier N1B, and a first triode Q1; One end of the third resistor R4 is connected to the third pin (gate) of the MOS transistor V1, and the other end is connected to the emitter of the first triode Q1; The collector of the first triode Q1 is connected to the voltage signal terminal; the base of the first triode Q1 is connected to one end of the second resistor R3; The other end of the second resistor R3 is connected to the output pin of the second operational amplifier N1B. The first inverting input pin of the second operational amplifier N1B is connected to the V-Icy signal terminal; the second pin of the second operational amplifier N1B is connected to the output pin of the first operational amplifier N1A; The first pin of the first operational amplifier N1A is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the voltage signal terminal; The second pin of the first operational amplifier N1A is connected to the first pin of the first operational amplifier N1A; The third pin of the first operational amplifier N1A is connected to the GND signal terminal.

[0010] Furthermore, the control circuit further includes a fourth resistor R6; One end of the fourth resistor R6 is connected to the intersection of the first pin of the first operational amplifier N1A and one end of the first resistor R1, and the other end is connected to the GND signal terminal.

[0011] Furthermore, the control circuit further includes a fifth resistor R8; One end of the fifth resistor R8 is connected between one end of the third resistor R4 and the third pin (gate) of the MOS transistor V1; The other end of the fifth resistor R8 is connected between the sixth resistor R9 and the V-Icy signal terminal.

[0012] Preferably, the over-discharge protection circuit includes a seventh resistor R12, a first capacitor C2, an eighth resistor R13, a second triode Q2, a ninth resistor R14, a thirteenth resistor R18, a thyristor Q5, a tenth resistor R15, a third triode Q3, a third capacitor C5, a third voltage regulator diode D3, an eleventh resistor R16, a first voltage regulator diode Q4, a twelfth resistor R17, and a sixteenth resistor R22; One end of the twelfth resistor R17 is connected to the Vin signal terminal, the other end is connected to one end of the sixteenth resistor R22, and the other end of the sixteenth resistor R22 is connected to the GND signal terminal; The reference terminal of the first voltage regulator diode Q4 is connected between the twelfth resistor R17 and the sixteenth resistor R22; the cathode terminal of the first voltage regulator diode Q4 is connected to the eleventh resistor R16; the cathode terminal of the first voltage regulator diode Q4 is connected to the GND signal terminal; The anode terminal of the third voltage regulator diode D3 is connected between the cathode terminal of the first voltage regulator diode Q4 and the eleventh resistor R16; The anode terminal of the third voltage regulator diode D3 is connected to the base terminal of the third triode Q3; the collector of the third triode Q3 is connected to one end of the tenth resistor R15; the emitter of the third triode Q3 is connected to one end of the third capacitor C5; The trigger electrode of the thyristor Q5 is connected between the emitter of the third triode Q3 and the third capacitor C5, the anode of the thyristor Q5 is connected to one end of the ninth resistor R14 through the thirteenth resistor R18; the cathode of the thyristor Q5 is connected to the GND signal terminal; The base terminal of the second triode Q2 is connected between the thirteenth resistor R18 and the ninth resistor R14, and the collector of the second triode Q2 is connected to the GND signal terminal; the emitter of the second triode Q2 and one end of the eighth resistor R13 are connected to the voltage signal terminal; The other ends of the eleventh resistor R16, the tenth resistor R15, the ninth resistor R14, and the eighth resistor R13 are combined and connected between the seventh resistor R12 and the first capacitor C2, and the seventh resistor R12 is connected to the Vin signal terminal; the other end of the first capacitor C2 is connected to the GND signal terminal.

[0013] Further, the over-discharge protection circuit further includes a fourth capacitor C6, a fourteenth resistor R19, a second capacitor C3, and a fifteenth resistor R20; The fourth capacitor C6 is connected in parallel with the sixteenth resistor R22. One end of the fourth capacitor C6 is disposed between the reference terminal of the first voltage regulator diode Q4 and the sixteenth resistor R22, and the other end is connected to the GND signal terminal; The fourteenth resistor R19 and the second capacitor C3 are respectively connected in parallel with the first voltage regulator diode Q4. One ends of the fourteenth resistor R19 and the second capacitor C3 are respectively connected between the reference terminal of the first voltage regulator diode Q4 and the collector of the third triode Q3, and the other ends of the fourteenth resistor R19 and the second capacitor C3 are connected to the GND signal terminal; wherein, a third voltage regulator diode D3 is disposed between one ends of the fourteenth resistor R19 and the second capacitor C3; The fifteenth resistor R20 is connected in parallel with the third capacitor C5. One end of the fifteenth resistor R20 is connected between the third capacitor C5 and the trigger electrode of the thyristor Q5, and the other end is connected to the GND signal terminal.

[0014] Further, the over-discharge protection circuit further includes a second voltage regulator diode D1; the second voltage regulator diode D1 is connected in parallel with the first capacitor C2.

[0015] In a second aspect, the present invention further provides a discharging method for a self-powered discharging circuit system. Based on the above-mentioned self-powered discharging circuit system, it includes: When the battery is connected, the voltage after voltage regulation is adjusted by the second voltage regulator diode D1 to supply power to the constant current discharging control circuit. At this time, the first voltage regulator diode Q4 is in the conducting state, and the second triode Q2, the third triode Q3, and the thyristor Q5 are all in the cut-off state; the voltage signal terminal supplies power normally and outputs, the control circuit works, and the mos tube V1 works in the linear region to ensure that the battery discharges in a predetermined constant current state; When the voltage across the battery is lower than the preset voltage value, the anode and cathode of the first voltage regulator diode Q4 are disconnected, the second triode Q2, the third triode Q3, and the thyristor Q5 are all in the conducting state, the voltage signal terminal is pulled low, the control circuit does not work, and the MOS transistor V1 is turned off, thus disconnecting the battery discharge power line, so that the battery will not be over-discharged.

[0016] Preferably, the first operational amplifier N1A and the second operational amplifier N1B drive the MOS transistor V1 by driving the first triode Q1.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a self-powered discharge circuit system, which is powered by the battery itself without the need for external power supply access, simplifies the overall circuit architecture, reduces the hardware cost and wiring difficulty, and the control circuit operates using the energy of the discharged battery. This design avoids energy loss caused by an additional power supply. By converting and utilizing the energy of the discharged battery, the battery energy is maximally utilized, greatly saving electric energy, improving the energy utilization efficiency of the entire system, helping to extend the battery usage time, and enhancing the battery life of the product. The present invention uses the discharged battery to replace the external power supply of the battery discharge circuit to supply power to the control circuit in this design, thereby utilizing the energy of the discharged battery and avoiding the consumption of external power supply, thus achieving the effect of saving power consumption.

[0018] Further, the fuse is connected in series between the positive electrode of the battery and the MOS transistor. When abnormal conditions such as short circuit and overload occur in the load circuit, resulting in a sharp increase in current, the fuse wire in the fuse will quickly melt due to overheating, thus immediately cutting off the circuit to prevent the battery from continuously outputting a large current and causing serious safety accidents such as overheating, fire, or even explosion; the MOS transistor is a controllable switching element, and its conducting state is controlled by the gate voltage. By precisely adjusting the gate voltage through the control circuit, the on-resistance of the MOS transistor can be indirectly controlled, thereby achieving fine adjustment of the load current; the sixth resistor is connected in series between the source electrode of the MOS transistor and GND. According to Ohm's law, the voltage drop across the resistor is proportional to the current passing through it. By measuring the voltage drop across both ends, the magnitude of the current in the load circuit can be indirectly obtained, and this current signal is fed back to the control circuit. The control circuit can adjust the gate voltage of the MOS transistor in real time according to the fed-back current signal to achieve precise closed-loop control of the load current and ensure that the load operates within a safe and stable current range.

[0019] The present invention also provides a discharging method for a self-powered discharging circuit system. When the battery voltage discharges to a set value, this part of the functional circuit operates to cut off the power supply voltage signal of the battery discharging control circuit, thereby disconnecting the battery discharging loop, without the need for manual or controller detection and judgment to disconnect the battery discharging loop.

[0020] Further, the operational amplifier drives the discharging power MOS transistor V1 by driving the triode Q1 (it is required that the ICE parameters of the triode are greater than 2A to ensure sufficient transient driving ability) to prevent a large current (usually about 1A) from being required when driving V1 at the moment of startup, which may cause damage to the operational amplifier. The fuse F1 (the parameter is selected to be twice the constant current discharging point) is used to protect the battery from overcurrent discharging damage due to abnormal control circuit. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the self-powered discharging circuit system in the embodiment of the present invention; In the figure: 1. Battery; 2. Load circuit; 3. Control line; 4. Over-discharge protection line; F1. Fuse; V1. MOS transistor; R1. First resistor; R3. Second resistor; R4. Third resistor; R6. Fourth resistor; R8. Fifth resistor; R9. Sixth resistor; R12. Seventh resistor; R13. Eighth resistor; R14. Ninth resistor; R15. Tenth resistor; R16. Eleventh resistor; R17. Twelfth resistor; R18. Thirteenth resistor; R19. Fourteenth resistor; R20. Fifteenth resistor; R22. Sixteenth resistor; Q1. First triode; Q2. Second triode; Q3. Third triode; Q4. First voltage regulator tube; Q5. Thyristor; N1A. First operational amplifier; N1B. Second operational amplifier; D1. Second voltage regulator tube; D3. Third voltage regulator tube; C2. First capacitor; C3. Second capacitor; C5. Third capacitor; C6. Fourth capacitor. Detailed Embodiments

[0022] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] The purpose of the present invention is to provide a self-powered discharging circuit system and method to solve the technical problem that the discharging device in the existing battery discharging technology still continues to work after stopping discharging.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings: Referring to Figure 1 , in an embodiment of the present invention, a self-powered discharge circuit system is provided, including a battery 1, a load circuit 2, a control circuit 3, and an over-discharge protection circuit 4; the positive terminal of the battery 1 is connected to the Vin signal terminal, and the negative terminal of the battery 1 is connected to the GND signal terminal; the load circuit 2 is arranged in parallel with the battery, and one end of the load circuit 2 is connected to the Vin terminal; the other end is connected to the GND signal terminal; one end of the control circuit 3 is connected to the load circuit 2, the other end is connected to the voltage signal terminal, and the ground terminal is connected to the GND signal terminal; one end of the over-discharge protection circuit 4 is connected to the Vin signal terminal; the other end is connected to the voltage signal terminal, and the ground terminal is connected to the GND signal terminal.

[0025] Specifically, the load circuit 2 includes a fuse F1, a MOS transistor V1, and a sixth resistor R9; one end of the fuse F1 is connected to the Vin signal terminal; the other end is connected to the first pin (drain) of the MOS transistor V1; the second pin (source) of the MOS transistor V1 is connected to one end of the sixth resistor R9, and the other end of the sixth resistor R9 is connected to the GND signal terminal; the third pin (gate) of the MOS transistor V1 is connected to one end of the control circuit 3.

[0026] Among them, the control circuit 3 includes a first resistor R1, a second resistor R3, a third resistor R4, a first operational amplifier N1A, a second operational amplifier N1B, and a first triode Q1; one end of the third resistor R4 is connected to the third pin (gate) of the MOS transistor V1, and the other end is connected to the emitter of the first triode Q1; the collector of the first triode Q1 is connected to the voltage signal terminal; the base of the first triode Q1 is connected to one end of the second resistor R3; the other end of the second resistor R3 is connected to the output pin of the second operational amplifier N1B, and the first pin (inverting input terminal) of the second operational amplifier N1B is connected to the V-Icy signal terminal; the second pin of the second operational amplifier N1B is connected to the output pin of the first operational amplifier N1A; the first pin of the first operational amplifier N1A is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the voltage signal terminal; the second pin of the first operational amplifier N1A is connected to the first pin of the first operational amplifier N1A; the third pin of the first operational amplifier N1A is connected to the GND signal terminal.

[0027] Among them, the control circuit 3 further includes a fourth resistor R6; one end of the fourth resistor R6 is connected to the intersection of the first pin of the first operational amplifier N1A and one end of the first resistor R1, and the other end is connected to the GND signal terminal.

[0028] Among them, the control circuit 3 further includes a fifth resistor R8; one end of the fifth resistor R8 is connected between one end of the third resistor R4 and the third pin gate of the MOS transistor V1; the other end of the fifth resistor R8 is connected between the sixth resistor R9 and the V-Icy signal terminal.

[0029] Specifically, the over-discharge protection circuit 4 includes a seventh resistor R12, a first capacitor C2, an eighth resistor R13, a second triode Q2, a ninth resistor R14, a thirteenth resistor R18, a thyristor Q5, a tenth resistor R15, a third triode Q3, a third capacitor C5, a third voltage regulator D3, an eleventh resistor R16, a first voltage regulator Q4, a twelfth resistor R17, and a sixteenth resistor R22; one end of the twelfth resistor R17 is connected to the Vin signal terminal, and the other end is connected to one end of the sixteenth resistor R22, and the other end of the sixteenth resistor R22 is connected to the GND signal terminal; the reference terminal of the first voltage regulator Q4 is connected between the twelfth resistor R17 and the sixteenth resistor R22; the cathode terminal of the first voltage regulator Q4 is connected to the eleventh resistor R16; the cathode terminal of the first voltage regulator Q4 is connected to the GND signal terminal; the anode terminal of the third voltage regulator D3 is connected between the cathode terminal of the first voltage regulator Q4 and the eleventh resistor R16; the anode terminal of the third voltage regulator D3 is connected to the base terminal of the third triode Q3; the collector of the third triode Q3 is connected to one end of the tenth resistor R15; the emitter terminal of the third triode Q3 is connected to one end of the third capacitor C5; the trigger electrode of the thyristor Q5 is connected between the emitter terminal of the third triode Q3 and the third capacitor C5, and the anode terminal of the thyristor Q5 is connected to one end of the ninth resistor R14 through the thirteenth resistor R18; the cathode terminal of the thyristor Q5 is connected to the GND signal terminal; the base terminal of the second triode Q2 is connected between the thirteenth resistor R18 and the ninth resistor R14, and the collector of the second triode Q2 is connected to the GND signal terminal; the emitter of the second triode Q2 and one end of the eighth resistor R13 are connected to the voltage signal terminal; the other ends of the eleventh resistor R16, the tenth resistor R15, the ninth resistor R14, and the eighth resistor R13 are combined and connected between the seventh resistor R12 and the first capacitor C2, and the seventh resistor R12 is connected to the Vin signal terminal; the other end of the first capacitor C2 is connected to the GND signal terminal.

[0030] Among them, the over-discharge protection circuit 4 further includes a fourth capacitor C6, a fourteenth resistor R19, a second capacitor C3, and a fifteenth resistor R20; the fourth capacitor C6 is connected in parallel with a sixteenth resistor R22, wherein one end of the fourth capacitor C6 is disposed between the reference terminal of the first voltage regulator diode Q4 and the sixteenth resistor R22, and the other end is connected to the GND signal terminal; the fourteenth resistor R19 and the second capacitor C3 are respectively connected in parallel with the first voltage regulator diode Q4, wherein one ends of the fourteenth resistor R19 and the second capacitor C3 are respectively connected between the reference terminal of the first voltage regulator diode Q4 and the collector of the third triode Q3, and the other ends of the fourteenth resistor R19 and the second capacitor C3 are connected to the GND signal terminal; wherein, a third voltage regulator diode D3 is disposed between one ends of the fourteenth resistor R19 and the second capacitor C3; the fifteenth resistor R20 is connected in parallel with a third capacitor C5, wherein one end of the fifteenth resistor R20 is connected between the third capacitor C5 and the trigger electrode of the thyristor Q5, and the other end is connected to the GND signal terminal.

[0031] Among them, the over-discharge protection circuit 4 further includes a second voltage regulator diode D1; the second voltage regulator diode D1 is connected in parallel with the first capacitor C2.

[0032] In summary, a self-powered discharge circuit system provided by the present invention is powered by the battery itself without external power supply access, simplifies the overall circuit architecture, reduces the hardware cost and wiring difficulty, and the control circuit operates using the energy of the battery to be discharged. This design avoids energy loss caused by an additional power supply. By converting and utilizing the energy of the battery to be discharged, the role of the battery energy is maximally exerted, greatly saving electric energy, improving the energy utilization efficiency of the entire system, helping to extend the battery usage time, and enhancing the battery life of the product. The present invention uses the battery to be discharged to replace the external power supply of the battery discharge circuit to supply power to the control circuit in this design, thereby utilizing the energy of the battery to be discharged, avoiding the consumption of external power supply, and thus achieving the effect of power consumption saving.

[0033] Embodiment 2 Embodiment 2 of the present invention further provides a discharge method for a self-powered discharge circuit system. Based on the above-mentioned self-powered discharge circuit system, it includes: When the battery 1 is connected, the voltage after voltage regulation is adjusted by the second voltage regulator diode D1 to supply power to the constant current discharge control circuit. At this time, the first voltage regulator diode Q4 is in the conducting state, and the second triode Q2, the third triode Q3, and the thyristor Q5 are all in the cut-off state; the voltage signal terminal supplies power normally and outputs, the control circuit 3 operates, and the mos transistor V1 operates in the linear region to ensure that the battery discharges in a predetermined constant current state; When the voltage across the battery is lower than the preset voltage value, the anode and cathode of the first voltage regulator diode Q4 are disconnected. The second triode Q2, the third triode Q3, and the thyristor Q5 are all in the conducting state, the voltage signal terminal is pulled low, the control circuit 3 does not work, and the mos tube V1 is turned off, thus disconnecting the discharge power circuit of the battery 1, and the battery will not be over-discharged.

[0034] Specifically, to ensure the reliability of the circuit, the operational amplifier drives the discharge power mos tube V1 by driving the triode Q1 (it is required that the ICE parameter of the triode is greater than 2A to ensure sufficient transient driving ability) to prevent a large current (usually about 1A) from being required when driving V1 at the moment of startup, which may cause damage to the operational amplifier. The fuse F1 (the parameter is selected to be twice the constant current discharge point) is used to protect the battery from being damaged by overcurrent discharge due to abnormalities in the control circuit.

[0035] In this embodiment, the output voltage of the voltage signal terminal is 12V. In this embodiment, the constant current point of discharge is controlled by three parts: the variable resistor R6 or the V-Icy reference given signal. In this embodiment, once the circuit reaches the discharge threshold of 26V, the control circuit will be locked. The power consumption of the entire locked control circuit is about 12V * 10mA = 0.12W. This extremely low power consumption can ensure that even if you forget to unplug the battery in time, it will not cause the battery to continue discharging, ensuring the battery life.

[0036] In summary, this embodiment provides a discharge method for a self-powered discharge circuit system. Since the external power supply of this circuit comes from the battery being discharged itself, there is no need to use an additional power supply to assist the circuit operation. Since the control circuit uses the energy of the battery being discharged to make the circuit work, the energy consumption of the circuit is reduced. The design scheme of this circuit converts and utilizes the energy of the battery being discharged, greatly saving electric energy. A discrete device is used to build a circuit to detect the terminal voltage of the battery being discharged. When the battery voltage discharges to the set value, this part of the functional circuit works to cut off the 12V power supply of the battery discharge control circuit, thus disconnecting the battery discharge loop, without the need for manual or controller detection and judgment to disconnect the battery discharge loop.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A self-powered discharge circuit system, characterized in that, It includes a battery, a load circuit, a control circuit, and an over-discharge protection circuit; The positive terminal of the battery is connected to the Vin signal terminal, and the negative terminal of the battery is connected to the GND signal terminal; The load circuit is arranged in parallel with the battery, and one end of the load circuit is connected to the Vin terminal; the other end is connected to the GND signal terminal; One end of the control circuit is connected to the load circuit, the other end is connected to the voltage signal terminal, and the ground terminal is connected to the GND signal terminal; One end of the over-discharge protection circuit is connected to the Vin signal terminal; the other end is connected to the voltage signal terminal, and the ground terminal is connected to the GND signal terminal.

2. The self-powered discharge circuit system according to claim 1, characterized in that The load circuit includes a fuse F1, a MOS transistor V1, and a sixth resistor R9; One end of the fuse F1 is connected to the Vin signal terminal; the other end is connected to the first pin (drain) of the MOS transistor V1; The second pin (source) of the MOS transistor V1 is connected to one end of the sixth resistor R9, and the other end of the sixth resistor R9 is connected to the GND signal terminal; The third pin (gate) of the MOS transistor V1 is connected to one end of the control circuit.

3. The self-powered discharge circuit system according to claim 2, wherein The control circuit includes a first resistor R1, a second resistor R3, a third resistor R4, a first operational amplifier N1A, a second operational amplifier N1B, and a first triode Q1; One end of the third resistor R4 is connected to the third pin (gate) of the MOS transistor V1, and the other end is connected to the emitter of the first triode Q1; The collector of the first triode Q1 is connected to the voltage signal terminal; the base of the first triode Q1 is connected to one end of the second resistor R3; The other end of the second resistor R3 is connected to the output pin of the second operational amplifier N1B. The first pin (inverting input terminal) of the second operational amplifier N1B is connected to the V-Icy signal terminal; the second pin of the second operational amplifier N1B is connected to the output pin of the first operational amplifier N1A; The first pin of the first operational amplifier N1A is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the voltage signal terminal; The second pin of the first operational amplifier N1A is connected to the first pin of the first operational amplifier N1A; The third pin of the first operational amplifier N1A is connected to the GND signal terminal.

4. The self-powered discharge circuit system according to claim 3, wherein The control circuit also includes a fourth resistor R6; One end of the fourth resistor R6 is connected to the intersection of the first pin of the first operational amplifier N1A and one end of the first resistor R1, and the other end is connected to the GND signal terminal.

5. The self-powered discharge circuit system according to claim 3, wherein, The control circuit also includes a fifth resistor R8; One end of the fifth resistor R8 is connected between one end of the third resistor R4 and the third pin (gate) of the MOS transistor V1; The other end of the fifth resistor R8 is connected between the sixth resistor R9 and the V-Icy signal terminal.

6. A self-powered discharge circuit system according to claim 1, characterized in that, The over-discharge protection circuit includes a seventh resistor R12, a first capacitor C2, an eighth resistor R13, a second triode Q2, a ninth resistor R14, a thirteenth resistor R18, a thyristor Q5, a tenth resistor R15, a third triode Q3, a third capacitor C5, a third zener diode D3, an eleventh resistor R16, a first zener diode Q4, a twelfth resistor R17, and a sixteenth resistor R22; One end of the twelfth resistor R17 is connected to the Vin signal terminal, and the other end is connected to one end of the sixteenth resistor R22. The other end of the sixteenth resistor R22 is connected to the GND signal terminal; The reference terminal of the first voltage regulator diode Q4 is connected between the twelfth resistor R17 and the sixteenth resistor R22; the cathode terminal of the first voltage regulator diode Q4 is connected to the eleventh resistor R16; the cathode terminal of the first voltage regulator diode Q4 is connected to the GND signal terminal; The anode terminal of the third voltage regulator diode D3 is connected between the cathode terminal of the first voltage regulator diode Q4 and the eleventh resistor R16; The anode terminal of the third voltage regulator diode D3 is connected to the base terminal of the third triode Q3; the collector of the third triode Q3 is connected to one end of the tenth resistor R15; the emitter of the third triode Q3 is connected to one end of the third capacitor C5; The trigger electrode of the thyristor Q5 is connected between the emitter of the third triode Q3 and the third capacitor C5. The anode of the thyristor Q5 is connected to one end of the ninth resistor R14 through the thirteenth resistor R18; the cathode of the thyristor Q5 is connected to the GND signal terminal; The base terminal of the second triode Q2 is connected between the thirteenth resistor R18 and the ninth resistor R14. The collector of the second triode Q2 is connected to the GND signal terminal; the emitter of the second triode Q2 and one end of the eighth resistor R13 are connected to the voltage signal terminal; The other ends of the eleventh resistor R16, the tenth resistor R15, the ninth resistor R14, and the eighth resistor R13 are combined and connected between the seventh resistor R12 and the first capacitor C2. The seventh resistor R12 is connected to the Vin signal terminal; the other end of the first capacitor C2 is connected to the GND signal terminal.

7. The self-powered discharge circuit system according to claim 6, characterized in that, The over-discharge protection circuit further includes a fourth capacitor C6, a fourteenth resistor R19, a second capacitor C3, and a fifteenth resistor R20; The fourth capacitor C6 is arranged in parallel with the sixteenth resistor R22. One end of the fourth capacitor C6 is arranged between the reference terminal of the first voltage regulator diode Q4 and the sixteenth resistor R22, and the other end is connected to the GND signal terminal; The fourteenth resistor R19 and the second capacitor C3 are respectively arranged in parallel with the first voltage regulator diode Q4. One ends of the fourteenth resistor R19 and the second capacitor C3 are respectively connected between the reference terminal of the first voltage regulator diode Q4 and the collector of the third triode Q3. The other ends of the fourteenth resistor R19 and the second capacitor C3 are connected to the GND signal terminal; among them, the third voltage regulator diode D3 is arranged between one ends of the fourteenth resistor R19 and the second capacitor C3; The fifteenth resistor R20 is arranged in parallel with the third capacitor C5. One end of the fifteenth resistor R20 is connected between the third capacitor C5 and the trigger electrode of the thyristor Q5, and the other end is connected to the GND signal terminal.

8. The self-powered discharge circuit system according to claim 6, characterized in that, The over-discharge protection circuit further includes a second voltage regulator diode D1; the second voltage regulator diode D1 is arranged in parallel with the first capacitor C2.

9. A discharging method for a self-powered discharging circuit system, characterized in that, A self-powered discharge circuit system according to any one of claims 1-9, comprising: When the battery is connected, the voltage after voltage stabilization is adjusted by the second voltage regulator diode D1 to supply power to the constant current discharge control circuit. At this time, the first voltage regulator diode Q4 is in the conducting state, and the second triode Q2, the third triode Q3, and the thyristor Q5 are all in the cut-off state; the voltage signal terminal supplies power normally and outputs, the control circuit works, and the MOS transistor V1 works in the linear region to ensure that the battery discharges in a predetermined constant current state; When the voltage across the battery is lower than the preset voltage value, the anode and cathode of the first voltage regulator diode Q4 are disconnected, the second triode Q2, the third triode Q3, and the thyristor Q5 are all in the conducting state, the voltage signal terminal is pulled low, the control circuit does not work, and the MOS transistor V1 is turned off, thereby disconnecting the discharge power circuit of the battery, so that the battery will not be over-discharged.

10. A discharging method for a self-powered discharging circuit system according to claim 9, characterized in that, The first operational amplifier N1A and the second operational amplifier N1B drive the MOS transistor V1 by driving the first triode Q1.

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