Double-storage-battery automatic switching charging and discharging circuit

Abstract

The utility model discloses a dual-storage-battery automatic switching charging and discharging circuit, which relates to the technical field of storage battery charging and discharging and comprises a power supply control module used for electric energy access, voltage stabilization regulation and electric energy transmission control; the charging control module is used for carrying out electric quantity detection on the first storage battery module or the second storage battery module and controlling the power supply control module to carry out charging control; the first storage battery module and the second storage battery module are used for storing and discharging electricity; the power supply switching module is used for controlling the transmission control module to work; the transmission control module is used for controlling the first storage battery module and the second storage battery module to carry out electric energy superposition; and the first output module and the second output module are both used for discharging control. The double-storage-battery automatic switching charging and discharging circuit can realize the switching between an automatic charging mode and a discharging mode, and control the discharging state, so as to provide electric energy in a higher voltage range, and increase the power supply application range of the circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of battery charging and discharging technology, in particular to double battery automatic switching charging and discharging circuit. BACKGROUND

[0002] The battery is a kind of battery, also called storage battery, to improve the endurance of battery, double battery is used to power supply, the double battery in prior art is charged or discharged control, all by manual switch to realize the switching of charging mode and discharging mode, user experience is not good, and when discharging mode, double battery cannot be controlled to be in series power supply, leading to the voltage range of electric energy that double battery can provide is small, and the applicable range of battery is not high, thus there is room for improvement. UTILITY MODEL CONTENT

[0003] The utility model embodiment provides double battery automatic switching charging and discharging circuit to solve the problem in the background art.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] Double battery automatic switching charging and discharging circuit, comprising: power control module, charging control module, first battery module, second battery module, power supply switching module, transmission control module, first output module and second output module;

[0006] Power control module is connected with charging control module, first battery module and second battery module, is used to access direct-current electric energy and carries out voltage regulation and treatment to direct-current electric energy, exports first electric energy, when receiving the first charging signal that charging control module exports, first electric energy is transmitted to first battery module, when receiving the second charging signal that charging control module exports, first electric energy is transmitted to second battery module;

[0007] Charging control module is connected with first battery module and second battery module, is used to detect the electric quantity of first battery module or second battery module and exports first sampling signal and second sampling signal respectively, sets low threshold and full power threshold, when first sampling signal is less than low threshold, exports first charging signal and when first sampling signal is less than full power threshold, continues to export first charging signal, when second sampling signal is less than low threshold, exports second charging signal and when second sampling signal is less than full power threshold, continues to export second charging signal;

[0008] First battery module is used to store first electric energy and provide second electric energy;

[0009] Second battery module is used to store first electric energy and provide third electric energy;

[0010] The power supply switching module is connected with the power supply control module and the first output module, and is configured to receive the first electric energy and provide the first control signal through a button when the first output module does not receive the first charging signal.

[0011] The transmission control module is connected with the first output module, the first battery module, the second battery module and the power supply switching module, and is configured to transmit the second electric energy to the first output module, stop transmitting the second electric energy when the first control signal is received, store the third electric energy and superimpose the third electric energy on the second electric energy, and output the fourth electric energy.

[0012] The first output module is connected with the charging control module, and is configured to transmit the second electric energy or the fourth electric energy to the connected electric device when the first charging signal is not received.

[0013] The second output module is connected with the second battery module, the charging control module and the power supply switching module, and is configured to transmit the third electric energy to the connected electric device when the second charging signal is not received, and stop transmitting the third electric energy when the first control signal is received.

[0014] As a further scheme of the utility model: the power supply control module includes a power supply interface, a power management device, a first power tube and a second power tube; the first battery module includes a first battery; the second battery module includes a second battery;

[0015] Preferably, the first end and the second end of the power supply interface are connected with the first end and the second end of the power management device respectively, the third end of the power management device is connected with the drain of the first power tube and the drain of the second power tube, the source of the first power tube and the source of the second power tube are connected with the first end of the first battery and the second end of the second battery respectively, the fourth end of the power management device is connected with the second end of the second battery, the second end of the first battery and the ground end, and the gate of the first power tube and the gate of the second power tube are connected with the charging control module.

[0016] As a further scheme of the utility model: the transmission control module includes a fourth power tube, a second resistor, a first capacitor, a first diode, a first switch tube, a fourth resistor and a third power tube;

[0017] Preferably, the drain of the fourth power tube is connected with one end of the first capacitor and the source of the first power tube, and the gate of the fourth power tube and the collector of the first switch tube are connected through the second resistor, the base of the first switch tube is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the gate of the third power tube and the power supply switching module, the other end of the first capacitor is connected with the anode of the first diode and the source of the third power tube, the cathode of the first diode is connected with the source of the fourth power tube and the first output module, the drain of the third power tube is connected with the source of the second power tube, and the emitter of the first switch tube is connected with the fourth end of the power management device.

[0018] As a further scheme of the utility model: the first output module includes sixth power tube, first output port and second inverter;

[0019] Preferably, the drain of the sixth power tube is connected with the source of the fourth power tube, the source of the sixth power tube is connected with the first end of the first output port, the gate of the sixth power tube is connected with the output end of the second inverter and the power supply switching module, the input end of the second inverter is connected with the gate of the first power tube, and the second end of the first output port is connected with the fourth end of the power management device.

[0020] As a further scheme of the utility model: the second output module includes fifth power tube, second output port, first inverter, second switch tube and third resistance;

[0021] Preferably, the drain of the fifth power tube is connected with the source of the second power tube, the gate of the fifth power tube is connected with the output end of the first inverter and the collector of the second switch tube, the source of the fifth power tube is connected with the first end of the second output port, the emitter of the second switch tube is connected with the second end of the power management device and the second end of the second output port, the input end of the first inverter is connected with the gate of the second power tube, and the gate of the third power tube is connected with the power supply switching module and connected with the base of the second switch tube through the third resistance.

[0022] As a further scheme of the utility model: the power supply switching module includes first resistance, first key switch and first logic chip;

[0023] Preferably, the static end of the first key switch is connected with the source of the first power tube through the first resistance, the dynamic end of the first key switch is connected with the A end of the first logic chip, the B end of the first logic chip is connected with the output end of the second inverter, and the Y end of the first logic chip is connected with the second end of the fourth resistance and the gate of the third power tube.

[0024] As a further scheme of the utility model: the charging control module includes fifth resistance, sixth resistance, seventh resistance, eighth resistance, first power supply, ninth resistance, third switch tube, first detection device and first comparator;

[0025] Preferably, the inverting terminal of the first comparator is connected with one end of the sixth resistor and the first terminal of the first battery through the fifth resistor, the non-inverting terminal of the first comparator is connected with the emitter of the third switch tube and one end of the seventh resistor and the other end of the sixth resistor and the second terminal of the first battery through the eighth resistor, the output terminal of the first comparator is connected with the gate of the first power tube and the base of the third switch tube, the collector of the third switch tube is connected with the other end of the seventh resistor and the first power supply through the ninth resistor, the first detection terminal and the second detection terminal of the first detection device are connected with the first terminal and the second terminal of the second battery respectively, and the output terminal of the first detection device is connected with the gate of the second power tube and the input terminal of the first inverter.

[0026] Compared with the prior art, the double-battery automatic switching charging and discharging circuit has the advantages that: the charging control module can detect the power states of the first battery module and the second battery module, and when the first battery module and the second battery module are low in power, the power supply control module is controlled to charge, and when the charging is stopped, the first output module and the second output module are controlled to discharge the first battery module and the second battery module respectively, so that the automatic charging mode and the discharging mode are switched, the transmission control module is switched by the power supply switching module to switch the power transmission path, the first battery module and the second battery module are superimposed to supply power, higher voltage range power is provided, and the power supply application range of the circuit is increased. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 The principle block diagram of the double-battery automatic switching charging and discharging circuit provided for the embodiments of the present application is shown.

[0029] Figure 2 The circuit diagram of the double-battery automatic switching charging and discharging circuit provided for the embodiments of the present application is shown.

[0030] Figure 3 The connection circuit diagram of the charging control module provided for the embodiments of the present application is shown. DETAILED DESCRIPTION

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] In one embodiment, see Figure 1 The dual-battery automatic switching charging and discharging circuit includes: a power control module 1, a charging control module 2, a first battery module 3, a second battery module 4, a power supply switching module 5, a transmission control module 6, a first output module 7, and a second output module 8.

[0033] Specifically, the power control module 1 is connected to the charging control module 2, the first battery module 3, and the second battery module 4. It is used to receive DC power and perform voltage regulation on the DC power, output the first power, and when it receives the first charging signal output by the charging control module 2, it transmits the first power to the first battery module 3. When it receives the second charging signal output by the charging control module 2, it transmits the first power to the second battery module 4.

[0034] The charging control module 2 is connected to the first battery module 3 and the second battery module 4. It is used to detect the power of the first battery module 3 or the second battery module 4 and output a first sampling signal and a second sampling signal respectively. It sets a low power threshold and a full power threshold. When the first sampling signal is less than the low power threshold, it outputs a first charging signal. When the first sampling signal is less than the full power threshold, it continuously outputs a first charging signal. When the second sampling signal is less than the low power threshold, it outputs a second charging signal. When the second sampling signal is less than the full power threshold, it continuously outputs a second charging signal.

[0035] First battery module 3 is used to store first electrical energy and provide second electrical energy;

[0036] The second battery module 4 is used to store the first electrical energy and provide the third electrical energy;

[0037] The power supply switching module 5 is connected to the power control module 1 and the first output module 7, and is used to receive the first electrical energy and provide the first control signal by means of a button when the first output module 7 does not receive the first charging signal;

[0038] The transmission control module 6 is connected to the first output module 7, the first battery module 3, the second battery module 4 and the power supply switching module 5. It is used to transmit the second electrical energy to the first output module 7. When it receives the first control signal, it stops transmitting the second electrical energy, stores the third electrical energy and superimposes the third electrical energy with the second electrical energy to output the fourth electrical energy.

[0039] The first output module 7 is connected with the charging control module 2, and is configured to transmit the second electric energy or the fourth electric energy to the connected electric device when the first charging signal is not received.

[0040] The second output module 8 is connected with the second battery module 4, the charging control module 2 and the power supply switching module 5, and is configured to stop transmitting the third electric energy when the first control signal is received.

[0041] In a specific embodiment, the power supply control module 1 can be a power supply control circuit composed of a power supply interface, a power supply management device and a field effect transistor, can access the direct current electric energy and perform voltage stabilization processing and electric energy transmission control on the direct current electric energy; the charging control module 2 can be a charging control circuit composed of a resistor, a comparator, a transistor, a first detection device and the like, can set a low threshold and a full threshold and perform low detection and full detection on the first battery module 3 and the second battery module 4; the first battery module 3 can be a first battery circuit composed of a first battery, and can perform energy storage and discharge; the second battery module 4 can be a second battery circuit composed of a second battery, and can perform energy storage and discharge; the power supply switching module 5 can be a power supply switching circuit composed of a key switch, a resistor and a logic chip, can perform logic calculation and control the working of the transmission control module 6 and the second output module 8 through the key; the transmission control module 6 can be a transmission control circuit composed of a resistor, a field effect transistor, a capacitor and the like, can control the transmission state of the electric energy and control the electric energy superposition power supply working of the first battery module 3 and the second battery module 4; the first output module 7 can be a first output circuit composed of a first output port, a field effect transistor and an inverter, and can perform discharge control; the second output module 8 can be a second output circuit composed of a second output port, a field effect transistor and an inverter, and can perform discharge control.

[0042] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The power supply control module 1 includes a power supply interface, a power supply management device, a first power transistor Q1 and a second power transistor Q2; the first battery module 3 includes a first battery; the second battery module 4 includes a second battery.

[0043] Specifically, the first end and the second end of the power interface are connected to the first end and the second end of the power management device respectively, the third end of the power management device is connected to the drain of the first power tube Q1 and the drain of the second power tube Q2, the source of the first power tube Q1 and the source of the second power tube Q2 are connected to the first end of the first battery and the second end of the second battery respectively, the fourth end of the power management device is connected to the second end of the second battery, the second end of the first battery and the ground, the gate of the first power tube Q1 and the gate of the second power tube Q2 are connected to the charging control module 2.

[0044] In specific embodiments, the power management device can be composed of a voltage stabilizer and a filter; the first power tube Q1 and the second power tube Q2 can be N-channel field effect tubes.

[0045] Further, the transmission control module 6 includes a fourth power tube Q4, a second resistor R2, a first capacitor C1, a first diode D1, a first switch tube V1, a fourth resistor R4 and a third power tube Q3.

[0046] Specifically, the drain of the fourth power tube Q4 is connected to one end of the first capacitor C1 and the source of the first power tube Q1, and the gate of the fourth power tube Q4 and the collector of the first switch tube V1 are connected through the second resistor R2, the base of the first switch tube V1 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the gate of the third power tube Q3 and the power supply switching module 5, the other end of the first capacitor C1 is connected to the anode of the first diode D1 and the source of the third power tube Q3, the cathode of the first diode D1 is connected to the source of the fourth power tube Q4 and the first output module 7, the drain of the third power tube Q3 is connected to the source of the second power tube Q2, and the emitter of the first switch tube V1 is connected to the fourth end of the power management device.

[0047] In specific embodiments, the third power tube Q3 and the fourth power tube Q4 can be N-channel field effect tubes, wherein the third power tube Q3 transmits the electric energy released by the second battery, and the fourth power tube Q4 transmits the electric energy released by the first battery; the first capacitor C1 can be an energy storage capacitor; and the first switch tube V1 can be an NPN triode.

[0048] Further, the first output module 7 includes a sixth power tube Q6, a first output port and a second inverter J2.

[0049] Specifically, the drain of the sixth power tube Q6 is connected to the source of the fourth power tube Q4, the source of the sixth power tube Q6 is connected to the first end of the first output port, the gate of the sixth power tube Q6 is connected to the output end of the second inverter J2 and the power supply switching module 5, the input end of the second inverter J2 is connected to the gate of the first power tube Q1, and the second end of the first output port is connected to the fourth end of the power management device.

[0050] In specific embodiments, the sixth power tube Q6 can be an N-channel field effect tube.

[0051] Further, the second output module 8 comprises a fifth power tube Q5, a second output port, a first inverter J1, a second switch tube V2 and a third resistor R3.

[0052] Specifically, the drain of the fifth power tube Q5 is connected to the source of the second power tube Q2, the gate of the fifth power tube Q5 is connected to the output of the first inverter J1 and the collector of the second switch tube V2, the source of the fifth power tube Q5 is connected to the first end of the second output port, the emitter of the second switch tube V2 is connected to the second end of the power management device and the second end of the second output port, the input of the first inverter J1 is connected to the gate of the second power tube Q2, and the gate of the third power tube Q3 is connected to the power supply switching module 5 and the base of the second switch tube V2 through the third resistor R3.

[0053] In specific embodiments, the fifth power tube Q5 can be an N-channel field effect tube, the first inverter J1 can be a NOT gate chip, and the second switch tube V2 can be an NPN triode.

[0054] Further, the power supply switching module 5 comprises a first resistor R1, a first key switch S1 and a first logic chip U1.

[0055] Specifically, the static end of the first key switch S1 is connected to the source of the first power tube Q1 through the first resistor R1, the dynamic end of the first key switch S1 is connected to the A end of the first logic chip U1, the B end of the first logic chip U1 is connected to the output of the second inverter J2, and the Y end of the first logic chip U1 is connected to the second end of the fourth resistor R4 and the gate of the third power tube Q3.

[0056] In specific embodiments, the first logic chip U1 can be an AND gate chip.

[0057] Further, the charging control module 2 comprises a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first power supply VCC1, a ninth resistor R9, a third switch tube V3, a first detection device and a first comparator A1.

[0058] Specifically, the inverting terminal of the first comparator A1 is connected with one end of the sixth resistor R6 and the first end of the first battery through the fifth resistor R5, the non-inverting terminal of the first comparator A1 is connected with the emitter of the third switch tube V3 and one end of the seventh resistor R7 and the other end of the sixth resistor R6 and the second end of the first battery through the eighth resistor R8, the output terminal of the first comparator A1 is connected with the gate of the first power tube Q1 and the base of the third switch tube V3, the collector of the third switch tube V3 is connected with the other end of the seventh resistor R7 and the first power supply VCC1 through the ninth resistor R9, the first detection terminal and the second detection terminal of the first detection device are connected with the first end and the second end of the second battery respectively, and the output terminal of the first detection device is connected with the gate of the second power tube Q2 and the input terminal of the first inverter J1.

[0059] In the specific embodiment, the fifth resistor R5 and the sixth resistor R6 are used for sampling the electric quantity, the first power supply VCC1, the seventh resistor R7 and the eighth resistor R8 are used for setting the low electric threshold value, the ninth resistor R9 and the third switch tube V3 are used for setting the full electric threshold value, the third switch tube V3 can be an NPN type triode, the first comparator A1 can be an LM358 comparator, and the circuit composition structure of the first detection device is the same as that of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the first power supply VCC1, the ninth resistor R9, the third switch tube V3 and the first comparator A1, which is used for detecting the low electric value and the full electric value of the second battery.

[0060] In the double-battery automatic switching charging and discharging circuit, DC power is accessed through the power interface, the power management device performs voltage stabilization and filtering processing, and outputs first electric energy. The fifth resistor R5 and the sixth resistor R6 sample the electric quantity of the first battery. When the sampled signal is less than the low electric threshold value set by the first power supply VCC1, the seventh resistor R7 and the eighth resistor R8, the first comparator A1 outputs a first charging signal, controls the third switch tube V3 and the first power tube Q1 to be turned on, and transmits the first electric energy to the first battery. Meanwhile, the first power supply VCC1, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the third switch tube V3 set a full electric threshold value. At this time, the sampled signal is less than the set full electric threshold value, and the first comparator A1 will continue to output the first charging signal. Similarly, the first detection device detects the low electricity of the second battery and outputs a second charging signal to control the second power tube Q2 to control the charging work of the second battery until the second battery is fully charged. When the first battery is fully charged, the first comparator A1 stops outputting the first charging signal. When the second battery is fully charged, the first detection device stops outputting the second charging signal. At this time, the first inverter J1 triggers the fifth power tube Q5 to be turned on, and the second inverter J2 triggers the sixth power tube Q6 to be turned on, so that the first battery supplies power to the first output port, and the second battery supplies power to the second output port, realizing automatic charging and discharging switching control. When a larger output voltage is needed, press the first key switch S1. The A end of the first logic chip U1 is at a high level, and the sixth power tube Q6 is in a conductive state. The Y end of the first logic chip U1 outputs a first control signal to control the first switch tube V1, the second switch tube V2 and the third power tube Q3 to be turned on, and the fourth power tube Q4 to be cut off, so that the electric energy released by the second battery is stored in the first capacitor C1, and is superimposed with the electric energy output by the first battery and transmitted to the first output port through the first diode D1 and the sixth power tube Q6.

[0061] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the foregoing description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the elements of the claims. Any reference signs in the claims should not be considered as limiting the claims to which they belong.

[0062] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. A dual battery automatic switching charging and discharging circuit, characterized in that, The dual battery automatic switching charging and discharging circuit comprises a power supply control module, a charging control module, a first battery module, a second battery module, a power supply switching module, a transmission control module, a first output module and a second output module; The power supply control module is connected with the charging control module, the first battery module and the second battery module, is used for accessing and stabilizing and adjusting direct current electric energy, outputs first electric energy, transmits the first electric energy to the first battery module when receiving the first charging signal output by the charging control module, and transmits the first electric energy to the second battery module when receiving the second charging signal output by the charging control module; The charging control module is connected with the first battery module and the second battery module, is used for detecting the electric quantity of the first battery module or the second battery module and respectively outputting a first sampling signal and a second sampling signal, setting a low electric threshold and a full electric threshold, outputting the first charging signal when the first sampling signal is less than the low electric threshold, continuously outputting the first charging signal when the first sampling signal is less than the full electric threshold, outputting the second charging signal when the second sampling signal is less than the low electric threshold, and continuously outputting the second charging signal when the second sampling signal is less than the full electric threshold; The first battery module is used for storing the first electric energy and providing second electric energy; The second battery module is used for storing the first electric energy and providing third electric energy; The power supply switching module is connected with the power supply control module and the first output module, is used for receiving the first electric energy and providing a first control signal through a button when the first output module does not receive the first charging signal; The transmission control module is connected with the first output module, the first battery module, the second battery module and the power supply switching module, is used for transmitting the second electric energy to the first output module, stopping the transmission of the second electric energy when receiving the first control signal, storing the third electric energy and superimposing the third electric energy on the second electric energy, and outputting fourth electric energy; The first output module is connected with the charging control module, is used for transmitting the second electric energy or the fourth electric energy to a connected electric device when not receiving the first charging signal; The second output module is connected with the second battery module, the charging control module and the power supply switching module, is used for transmitting the third electric energy to a connected electric device when not receiving the second charging signal, and stopping the transmission of the third electric energy when receiving the first control signal.

2. The dual battery automatic switchover charge-discharge circuit according to claim 1, characterized by, The power supply control module comprises a power supply interface, a power management device, a first power tube and a second power tube; the first battery module comprises a first battery; and the second battery module comprises a second battery. The first end and the second end of the power supply interface are connected with the first end and the second end of the power management device respectively, the third end of the power management device is connected with the drain of the first power tube and the drain of the second power tube, the source of the first power tube and the source of the second power tube are connected with the first end of the first battery and the second end of the second battery respectively, the fourth end of the power management device is connected with the second end of the second battery, the second end of the first battery and the ground, and the gate of the first power tube and the gate of the second power tube are connected with the charge control module.

3. The dual battery automatic switchover charge-discharge circuit according to claim 2, characterized by, The transmission control module comprises a fourth power tube, a second resistor, a first capacitor, a first diode, a first switch tube, a fourth resistor and a third power tube. The drain of the fourth power tube is connected with one end of the first capacitor and the source of the first power tube and is connected with the gate of the fourth power tube and the collector of the first switch tube through the second resistor, the base of the first switch tube is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the gate of the third power tube and the power supply switching module, the other end of the first capacitor is connected with the anode of the first diode and the source of the third power tube, the cathode of the first diode is connected with the source of the fourth power tube and the first output module, the drain of the third power tube is connected with the source of the second power tube, and the emitter of the first switch tube is connected with the fourth end of the power management device.

4. The dual battery automatic switchover charge-discharge circuit according to claim 3, characterized by, The first output module comprises a sixth power tube, a first output port and a second inverter. The drain of the sixth power tube is connected with the source of the fourth power tube, the source of the sixth power tube is connected with the first end of the first output port, the gate of the sixth power tube is connected with the output end of the second inverter and the power supply switching module, the input end of the second inverter is connected with the gate of the first power tube, and the second end of the first output port is connected with the fourth end of the power management device.

5. The dual battery automatic switchover charge-discharge circuit according to claim 4, characterized by, The second output module comprises a fifth power tube, a second output port, a first inverter, a second switch tube and a third resistor. The drain of the fifth power tube is connected with the source of the second power tube, the gate of the fifth power tube is connected with the output end of the first inverter and the collector of the second switch tube, the source of the fifth power tube is connected with the first end of the second output port, the emitter of the second switch tube is connected with the second end of the second output port and the second end of the power management device, the input end of the first inverter is connected with the gate of the second power tube, and the gate of the third power tube is connected with the power supply switching module and is connected with the base of the second switch tube through the third resistor.

6. The dual battery automatic switchover charge-discharge circuit according to claim 5, wherein The power supply switching module comprises a first resistor, a first key switch and a first logic chip. The static end of the first key switch is connected with the source of the first power tube through the first resistor, the dynamic end of the first key switch is connected with the A end of the first logic chip, the B end of the first logic chip is connected with the output end of the second inverter, and the Y end of the first logic chip is connected with the second end of the fourth resistor and the gate of the third power tube.

7. The dual battery automatic switchover charge-discharge circuit according to claim 6, characterized by, The charge control module comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first power supply, a ninth resistor, a third switch tube, a first detection device and a first comparator. The opposite end of the sixth resistance is connected to the first end of the first comparator through the fifth resistance, the first end of the first battery, the same end of the first comparator is connected to the emitter of the third switch tube and the one end of the seventh resistance through the eighth resistance, the other end of the sixth resistance and the second end of the first battery, the output end of the first comparator is connected to the gate of the first power tube and the base of the third switch tube, the collector of the third switch tube is connected to the other end of the seventh resistance and the first power supply through the ninth resistance, the first detection end and the second detection end of the first detection device are connected to the first end and the second end of the second battery respectively, the output end of the first detection device is connected to the gate of the second power tube and the input end of the first inverter.

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