Automatic control logic circuit and control method for a battery

Abstract

This invention belongs to the field of power distribution system power network logic design, and relates to a battery automatic control logic circuit and control method. In the battery automatic control logic circuit, the battery power supply and each main power supply are respectively connected to the corresponding input terminals of the power conversion circuit, and the output of the power conversion circuit is used to power the battery automatic control logic circuit; the input terminals of the external power supply status judgment circuit are respectively connected to each main power supply, and the output of the first logic is connected to the logic judgment circuit and the delay circuit; the three input terminals of the discrete logic conversion circuit receive the emergency mode switch, the air mode, and the battery switch respectively, and the output of the second logic and the third logic is connected to the logic judgment circuit and the delay circuit; the input terminal of the isolation circuit receives the TRU status, and the output terminal is connected to the logic judgment circuit and the delay circuit; the output terminal of the logic judgment circuit and the delay circuit is connected to the input terminal of the drive circuit.

Description

Technical Field

[0001] This invention relates to aviation power distribution systems, belonging to the field of power network logic design for power distribution systems, and specifically to an automatic control logic circuit and control method for batteries. Background Technology

[0002] With the continuous development of aircraft types, the reliability of aircraft power distribution systems has attracted widespread attention. The rational use of batteries in aircraft power systems has a profound impact on flight safety and equipment reliability. However, how to effectively achieve the utilization efficiency of battery power has become a key factor in extending battery life and reducing operating costs in the complex power distribution system network of large aircraft.

[0003] Currently, in aircraft power distribution systems, the connection and disconnection of battery power are generally controlled by battery switches. The core control logic is a simple parallel connection mode between the main power supply and the battery, which is difficult to meet the dynamic response and energy optimization requirements of modern aviation systems under multiple operating conditions.

[0004] In conclusion, it is necessary to propose a method for using battery power to improve the rational use of battery power. Summary of the Invention

[0005] Purpose of the invention: To provide an automatic control logic circuit and control method for a storage battery, thereby achieving reasonable utilization of the storage battery power in the power distribution system, extending the service life of the storage battery power, and improving the reliability of the power distribution system.

[0006] Technical solution: An automatic control logic circuit for a storage battery includes: a power conversion circuit, an external power supply status judgment circuit, a discrete quantity logic conversion circuit, a logic judgment circuit and a delay circuit, an isolation circuit, and a drive circuit, wherein... The battery power supply and each main power supply are connected to the corresponding input terminal of the power conversion circuit. The output of the power conversion circuit is used to power the battery automatic control logic circuit. The input terminals of the external power supply status judgment circuit are connected to each main power supply respectively, and the output of the first logic is connected to the logic judgment circuit and the delay circuit. The three input terminals of the discrete logic converter circuit receive emergency mode switch, air mode and battery switch respectively, and output the second logic and the third logic to the logic judgment circuit and the delay circuit. The input of the isolation circuit receives the TRU status, and the output is connected to a logic judgment circuit and a delay circuit. The output terminals of the logic judgment circuit and the delay circuit are connected to the input terminals of the drive circuit, and the output terminal of the drive circuit outputs the battery-powered logic.

[0007] Furthermore, the logic judgment circuit and delay circuit include: logic gates M1-M8, capacitors C6-C9, resistors R18-R22, and diode D11, wherein, AND gate M1 receives the second and third logic at its two inputs; The two inputs of AND gate M2 receive the output of AND gate M1 and the isolated TRU state; the output of AND gate M2 is connected to one end of capacitor C6. The two inputs of AND gate M3 receive the isolated TRU state and the first logic. The two inputs of OR gate M4 are connected to the outputs of AND gate M1 and AND gate M3. The input of NOT gate M5 receives the first logic, and the output is connected to one end of resistor R18 and one end of resistor R20 after passing through capacitor C7. The other end of resistor R18 and the other end of capacitor C6 are connected to the two input terminals of OR gate M6. After passing through capacitor C9, the delayed pulse is connected to one end of resistor R21 and one end of resistor R22. The other end of resistor R21 and the output of OR gate M6 are connected to the two inputs of OR gate M7 respectively, and the output of OR gate M7 is connected to the TR+ input of multivibrator U5. The output terminal Q1 of the multivibrator U5 and the output terminal of the OR gate M4 are respectively connected to the two input terminals of the OR gate M8. The output of OR gate M8 is used as the output; The other end of resistor R20 and the other end of resistor R22 are grounded.

[0008] Furthermore, the peripheral circuit of the multivibrator U5 includes: resistor R19, capacitor C8, and diode D11, wherein, The RxCx(1) pin of the multivibrator U5 is connected to one end of the resistor R19, one end of the capacitor C8, and the anode of the diode D11. The other end of resistor R19 and the cathode of diode D11 are connected to the output of the power conversion circuit. The other end of capacitor C8 is grounded to pin Cx1 of multivibrator U5.

[0009] Furthermore, resistors R18 and R21 are used for current limiting; resistors R22 and R20 stabilize the input signal at ground level when there is no output at the front end.

[0010] A battery automatic control method, the method being executed by means of the aforementioned battery automatic control logic circuit, the method comprising: Step 1: The battery power and each main power source are converted into internal power through a power conversion circuit to supply power to each circuit; Step 2: The external power supply status determination circuit calculates the power supply status of each main power supply to form the first logic; Step 3: The discrete logic conversion circuit receives the emergency mode switch and calculates it to form the second logic; it receives the air mode and battery switch and calculates them to form the third logic. Step 4: After the TRU state is isolated by the isolation circuit, it enters the logic judgment circuit and delay circuit together with the three logic circuits to form a drive control signal input to the drive circuit, thereby realizing the power supply and power cut-off of the battery power supply.

[0011] Furthermore, the first logic is as follows: When the output voltage of any main power supply is greater than or equal to a predetermined threshold, the external power supply status logic signal outputs a high level; when the output voltage of each main power supply is less than the predetermined threshold, the external power supply status logic signal outputs a low level.

[0012] Furthermore, the predetermined threshold is 21.2V.

[0013] Furthermore, in step 3: When the emergency mode input is low, the second logic is low; otherwise, it is high. When the battery switch or air mode output is low, the third logic is low; otherwise, it is high.

[0014] Furthermore, in step 4, the conditions for achieving battery power supply are that the following must be met simultaneously: 1. The main power supply output voltage is lower than the predetermined threshold or the TRU is offline; 2. Any of the following signals is valid: emergency mode, battery switch, or air mode.

[0015] Furthermore, in step 4, the logic judgment circuit and delay circuit disconnect the battery after a delay when any of the following conditions are met: 1. When any main power supply voltage recovers to a predetermined threshold; 2. The second and third logic logics transition from low to high levels; 3. The delay pulse output by the main control chip is valid.

[0016] Beneficial effects: This application achieves real-time judgment of battery power-related status signals and automatic power supply through hardware circuit design. It is applicable to the design of battery power supply usage methods for key electrical equipment in aircraft power distribution systems, realizes the effect of automatic switching between product battery power supply and main power supply, improves the rational utilization rate of battery power supply, and enhances the safety and reliability of power distribution system.

[0017] The circuits in this application mostly use simple semiconductor devices, such as diodes and transistors, which can execute fast protection logic through hardware circuit logic, resulting in a fast response speed. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A block diagram of the automatic control logic circuit for a storage battery; Figure 2 Schematic diagram of power conversion circuit and external power supply status judgment circuit; Figure 3 This is a schematic diagram of a discrete-time logic converter circuit. Figure 4 This is a schematic diagram of a logic judgment circuit and a delay circuit. Figure 5 This is the schematic diagram of the drive circuit. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0022] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0024] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0026] Figure 1 This is a block diagram illustrating the principle of using a battery power supply, showing the circuit composition in the battery control logic circuit. Figures 2-5 These are schematic diagrams of the power conversion circuit and external power supply status judgment circuit, the discrete quantity logic conversion circuit, the logic judgment circuit and delay circuit, and the drive circuit, illustrating the circuit principle structure and implementation of each circuit.

[0027] like Figure 1 An automatic control logic circuit for a storage battery includes: a power conversion circuit, an external power supply status judgment circuit, a discrete quantity logic conversion circuit, a logic judgment circuit and a delay circuit, an isolation circuit, and a drive circuit, wherein... The battery power and the main power are converted into internal power through a power conversion circuit to power various circuits; The external power supply status judgment circuit is used to calculate the power supply status of each main power supply and form a logic signal, which is then input to the logic judgment circuit and the delay circuit. The discrete logic conversion circuit receives air mode, battery switch signal and emergency mode switch signal, and performs calculation to form a logic signal which is then input to the logic judgment circuit and the delay circuit. The external power supply status judgment circuit and discrete quantity acquisition circuit output discrete quantity signals into the logic judgment circuit. According to the logic judgment circuit, the output command is input to the contactor output drive circuit to realize the power supply and power cut-off of the battery power supply to the product.

[0028] The TRU status is isolated by the isolation circuit and then input to the logic judgment circuit and the delay circuit. After calculation, the logic judgment circuit and the delay circuit generate a drive control signal, thereby realizing the cutting off or connecting of the battery power supply.

[0029] The design of the automatic control logic circuit for the battery enables the automatic switching and effective utilization of battery power supply by the onboard equipment.

[0030] like Figure 2 , Figure 2 The power conversion circuit includes a linear regulator U1 (input VIN, adjustment terminal ADJ), a voltage reference chip U2, an operational amplifier U3, a transistor V1, diodes D1 and D2, a capacitor C1, and six resistors. The input power to this circuit is provided by the main power supply or battery power. This power is filtered by resistor R1 and capacitor C1 before supplying power to the linear regulator U1. After voltage regulation by resistors R2 and R3, the linear regulator U1 outputs 10V to power the voltage reference chip U2, operational amplifier U3, and other loads. The reference voltage output by the voltage reference chip U2 is proportionally amplified by an operational amplifier circuit composed of resistors R4, R5, R6, operational amplifier U3, and transistor V1, outputting 3.3V to power downstream loads.

[0031] The power conversion circuit includes: diodes D1 and D2, resistors R1-R6, capacitor C1, linear regulator U1, reference voltage source U2, comparator U3, and transistor V1. The positive terminals of diodes D1 and D2 are connected to the battery power supply and the main power supply, respectively. Their negative terminals are connected to resistor R1. The other end of resistor R1 is connected to the linear regulator U1 (input terminal VIN) and one end of capacitor C1. The other end of capacitor C1 is grounded together with resistor R3 and voltage reference source U2 (input terminal GND). One end of resistor R2 and the other end of resistor R3 are connected to the linear regulator U1 (adjustment terminal ADJ). The other end of resistor R2 is connected to voltage reference source U2 (input terminal VIN), comparator U3 (power supply positive input terminal), and transistor V1 (collector). The two ends of resistor R4 are connected to voltage reference source U2 (output terminal VOUT) and comparator U3 (input positive terminal), respectively. One end of resistor R5 and one end of resistor R6 are connected to comparator U3 (input negative terminal), and the other end is grounded together with comparator U3 (power supply negative terminal). The other end of resistor R6 is connected to transistor V1 (emitter). Comparator U3 (output terminal) is connected to transistor V1 (base).

[0032] Figure 2The external power supply status determination circuit includes diodes, resistors, ferrite beads, and a comparator. The circuit receives four main power supplies as input. These supplies are divided by resistors R7 and R8, filtered by a filter circuit consisting of ferrite bead L1 and capacitors C2 and C3, and then input to comparator U4. After processing by the comparator circuit consisting of comparator U4 and resistors R9 and R11, a logic signal indicating the external power supply status is output. All signals in this design are optically isolated.

[0033] The external power supply status detection circuit includes: diodes D3-D6, resistors R7-R11, capacitors C2 and C3, ferrite bead L1, and operational amplifier U4. The positive terminals of diodes D3-D6 are connected to the main power input, and their negative terminals are all connected to resistor R7. The other end of resistor R7 is connected to resistor R8, capacitor C2, and one end of ferrite bead L1; the other ends of resistor R8 and capacitor C2 are grounded. Capacitor C3 is connected to the other end of ferrite bead L1, resistor R11, and operational amplifier U4 (input negative terminal), with its other end grounded. The other end of resistor R11 is connected to operational amplifier U4 (output terminal) and resistor R10; the other end of resistor R10 is powered by +3.3V. The two ends of resistor R9 are connected to the voltage reference source output and operational amplifier U4 (input positive terminal), respectively.

[0034] Figure 3 The discrete-time logic converter (DJCP) circuit in the circuit includes diodes, Zener diodes, resistors, and capacitors. The inputs to this circuit include emergency mode, battery switch, and over-the-air mode signals from the main control chip. The output logic states formed after the emergency mode, battery switch, and over-the-air mode signals are processed by the JJCP circuit in a similar manner. Taking the emergency mode signal as an example, when the signal is open, the 10V power supply is divided by resistors R12, R13, and R14, resulting in a high-level emergency mode output logic. When the signal is grounded, the voltage at the connection of diodes D7 and D8 approaches 0V, making the voltage between resistors R13 and R14 0V, resulting in a low-level emergency mode output logic. In the circuit, diodes D7 and D8 provide reverse polarity protection, capacitor C4 provides filtering, and Zener diode D11 provides circuit protection.

[0035] The discrete-time logic converter circuit includes diodes D7-D10, resistors R12-R17, capacitors C4 and C5, and Zener diodes D11 and D12. Emergency mode, battery switch, and over-the-air mode signals are all discrete-time inputs to the circuit. The emergency mode signal is connected to the cathode of diode D7; resistor R12 is connected to 10V and the anodes of diodes D7 and D8 respectively; one end of resistor R13 is connected to the cathode of diode D8, and the other end serves as the emergency mode output logic signal; resistor R14, capacitor C4, and Zener diode D11 are connected to the emergency mode output logic signal and ground respectively. The battery switch and over-the-air mode signals are connected to the cathodes of diodes D9 and D10 respectively; resistor R15 is connected to 10V and the anodes of diodes D9 and D10 respectively; one end of resistor R16 is connected to the cathode of diode D10, and the other end serves as the emergency mode output logic signal; resistor R17, capacitor C5, and Zener diode D12 are connected to the emergency mode output logic signal and ground respectively.

[0036] Figure 4 The logic judgment circuit and delay circuit in the system include diodes, capacitors, resistors, logic gates, and multivibrators. The inputs to the logic judgment circuit include emergency mode output logic, battery switch, air mode output logic, TRU online status, and external power supply status output logic. Under different operating conditions, these signals are processed by logic gates M1 (AND gate), M3 (AND gate), and M4 (OR gate) to form a logic signal input to logic gate M8. The inputs to the delay circuit include: the delayed output logic output after logic operations on the emergency mode output logic, battery switch, air mode output logic, and TRU online status; the external power supply status output logic; and a delay pulse. Since the input signal of the multivibrator U5 requires a pulse signal, capacitors (C6, C7, and C9) are added to the input signal at the output terminals of logic gates M2 (AND gate), M5 (NOT gate), and after the delayed pulse signal in the delay circuit. This ensures that a pulse signal is generated at the output terminal of logic gate M7. The multivibrator U5 ultimately outputs the logic signal (battery delay-on signal) to logic gate M8. Logic gate M8 (OR gate) then outputs the battery power control logic output after processing. Resistor R19, capacitor C8, and diode D11 form the peripheral circuit of the multivibrator U5, used to adjust the delay time; resistors R18 and R21 are used for current limiting; and resistors R22 and R20 stabilize the input signal at ground level when there is no output at the front end.

[0037] The logic judgment circuit includes logic gates M1-M4, M8, and capacitor C6. The inputs of logic gate M1 are the emergency mode output logic signal and the battery switch and over-the-air mode output logic signals; the inputs of logic gate M3 are the TRU online status signal and the external power supply status output logic signal; the inputs of logic gate M2 are the TRU online status signal and the output of logic gate M1; the inputs of logic gate M4 are the outputs of logic gate M1 and M3; the two ends of capacitor C6 are connected to the output of logic gate M2 and the external delayed output logic, respectively; the inputs of logic gate M8 are the output of logic gate M4 and the battery delayed turn-on signal, and its output is the battery power control logic output.

[0038] The delay circuit includes: logic gates M5-M7, capacitors C7-C9, resistors R18-R22, and diode D11. One end of capacitor C9 is connected to the delayed pulse signal, and the other end is connected to resistors R21 and R22. The other end of resistor R22 is grounded, and the other end of resistor R21 is input to logic gate M7. The logic signal output by the external power supply is connected to the input of logic gate M5, and the output is connected to capacitor C7. The other end of capacitor C7 is connected to resistors R21 and R22. The other end of resistor R22 is grounded, and the other end of resistor R21 is input to logic gate M6. The output of logic gate M6 (OR gate) is connected to logic gate M7 (OR gate). The output of logic gate M7 is connected to multivibrator U5 (input TR+). Resistor R19, capacitor C8 and diode D11 are all connected to multivibrator U5 (input RxCx (1) pin). The other end of resistor R19 and diode D11 is connected to +3.3V, and the other end of capacitor C8 is grounded and connected to multivibrator U5 (input Cx1 pin).

[0039] Figure 5 The driving circuit includes resistors, transistors, Zener diodes, and MOSFETs. The input to this circuit is the battery power control logic output. Since this logic gate is powered by 3.3V, its driving capability is limited. Therefore, a driving circuit composed of resistors R23, R24, R26, R27, R28, R29, and R30, and transistors V2 and V3, was designed to drive MOSFETs V4 and V5. Zener diode D14 is used to protect the downstream MOSFET V5.

[0040] The driving circuit includes: resistors R23-R30, transistors V2 and V3, MOSFETs V4 and V5, and Zener diode D14. Resistor R28 is connected to the battery power control logic output signal, resistor R29, and the base of transistor V3, respectively. The emitter of transistor V3 and the other end of resistor R29 are grounded together. Resistor R23 is connected to resistor R25 and the base of transistor V2. The other end of resistor R23 is connected to the emitter of transistor V2 and to +10V DC. The other end of resistor R25 is connected to the collector of transistor V3. Resistors R27 and R30 are connected to the gate of MOSFET V4. The other end of resistor R27 is connected to the collector of transistor V2. The source of MOSFET V4 and the other end of resistor R30 are grounded together. The drain of MOSFET V4 is connected to resistor R26. Resistor R24 ​​and Zener diode D14 are connected to the battery power supply and the gate of MOSFET V5, respectively (the other end of resistor R26). The source and drain of MOSFET V5 are connected to the battery power supply and the battery power supply channel, respectively.

[0041] Depend on Figure 1 As shown, the battery power supply and main power supply provide +10V and +3.3V power to the power conversion circuit, respectively, to power all circuits. After the main power supply is connected to the external power supply status judgment circuit, it generates a logic signal through calculation and inputs it to the logic judgment circuit and delay circuit. The air mode, battery switch, and emergency mode switch generate logic signals through calculation and input them to the logic judgment circuit and delay circuit. The TRU status is isolated and input to the logic judgment circuit and delay circuit. The logic judgment circuit and delay circuit generate a drive control signal after calculation, thereby realizing the disconnection or connection of the battery power supply.

[0042] Depend on Figure 2 As shown, when the battery power supply or main power supply is activated, the power conversion circuit continuously provides power to the back-end circuit, causing the battery control logic circuit to start working.

[0043] Depend on Figure 2 As shown, when any main power supply output voltage is greater than or equal to 21.2V, the external power supply status logic signal output is high; when the main power supply output voltage is less than 21.2V, the external power supply status logic signal output is low.

[0044] Depend on Figure 3 As shown, when the emergency mode input is low, the emergency mode output logic signal will be low; otherwise, the output logic signal will be high. When either the battery switch or the air mode output is low, the battery switch or the air mode output logic signal will be low; otherwise, the output logic signal will be high.

[0045] Depend on Figure 4As shown, the output logic signal in the logic judgment circuit is processed by the logic judgment circuit to form a logic signal output to logic gate M8. After processing, the battery power control logic output signal is output to the drive circuit. A high level is output to logic gate M8 when the following conditions are met: 1. The main power supply output voltage is less than 21.2V or the TRU is offline (i.e., the input is low level). 2. Emergency mode, battery switch, or air mode signal can be valid at any time.

[0046] The delay circuit outputs logic based on the external power supply status. The delayed output logic signal and the delayed pulse signal are processed by logic operations to form a logic signal, which is then output to logic gate M8. The delay disconnection condition is met when any of the following conditions are satisfied: 1. When any main power supply voltage recovers to 21.2V; 2. The output logic signals of the discrete logic converter circuit are all converted from low level to high level; 3. The delay pulse output by the main control chip is valid.

[0047] Depend on Figure 5 As shown, when the battery power control logic output is high, the signal drives the transistor to turn on, improving the driving capability and driving the MOSFET at the back end. After the MOSFET is turned on, the battery power supply can supply power to the product through the battery power supply channel.

[0048] In summary, the battery automatic control logic circuit of this application judges the current power supply environment by analyzing status information such as main power supply status, emergency mode status, battery switch status, and over-the-air mode, and promptly connects or disconnects the battery power supply to the product. This battery power control logic design improves the rational utilization rate of the battery power supply and increases the reliability of the product's power supply.

[0049] Once the battery power supply voltage reaches the standard, the power conversion circuit can provide the internal power required by the battery logic control circuit, and enable the battery to be connected to the grid after the battery power connection conditions are met. The discrete signal acquisition circuit is designed with a protection circuit for external input signals to prevent damage to internal logic devices caused by abnormal external input signals. The signal ground output from the main control chip is isolated from the external signal ground to reduce external signal interference. The relevant signals affecting the battery connection are logically converted by 10 gate circuits to form control signals, and the driving capability is enhanced by a circuit built with 4 resistors and 2 transistors to drive the MOSFET to turn on / off. The resistor values ​​in the power conversion circuit are set, and the voltage is converted to 3.3V power supply using a transistor and operational amplifier circuit. The design of delayed disconnection of battery power can automatically disconnect the battery power under certain specific operating conditions through hardware, thereby improving the reliability of grid power supply. The drive control circuit uses transistors and resistors to enhance the driving capability of the logic control signals.

[0050] Working principle: When discrete status signals such as emergency mode and battery switch meet the battery connection requirements, the automatic battery control circuit automatically connects the MOSFET in the battery power supply channel, enabling the battery to supply power to the product. When the main power supply meets the requirements, the automatic battery control circuit automatically disconnects the MOSFET in the battery power supply channel. To ensure reliable power supply during the product's power transition, a delay circuit in the automatic battery control circuit outputs a delayed disconnect signal based on the current battery power supply conditions, causing the MOSFET to disconnect after a delay, thus ensuring the reliability of the power distribution system. The automatic battery control circuit can switch the system power supply according to the current real-time operation, disconnecting the battery power supply when other power supplies meet the requirements, thereby achieving the goal of rationally utilizing battery power, extending the battery's lifespan.

[0051] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery automatic control logic circuit, characterized in that, include: The circuit includes a power conversion circuit, an external power supply status judgment circuit, a discrete quantity logic conversion circuit, a logic judgment circuit and delay circuit, an isolation circuit, and a drive circuit. The battery power supply and each main power supply are connected to the corresponding input terminal of the power conversion circuit. The input terminals of the external power supply status judgment circuit are connected to each main power supply respectively, and the output of the first logic is connected to the logic judgment circuit and the delay circuit. The three input terminals of the discrete logic converter circuit receive emergency mode switch, air mode and battery switch respectively, and output the second logic and the third logic to the logic judgment circuit and the delay circuit. The input of the isolation circuit receives the TRU status, and the output is connected to a logic judgment circuit and a delay circuit. The output terminals of the logic judgment circuit and the delay circuit are connected to the input terminals of the drive circuit, and the output terminal of the drive circuit outputs the battery-powered logic.

2. The battery automatic control logic circuit according to claim 1, characterized in that, The logic judgment circuit and delay circuit include: logic gates M1-M8, capacitors C6-C9, resistors R18-R22, and diode D11, among which, The two inputs of AND gate M1 receive the second and third logic; the two inputs of AND gate M2 receive the output of AND gate M1 and the isolated TRU state; the output of AND gate M2 is connected to one end of capacitor C6; the two inputs of AND gate M3 receive the isolated TRU state and the first logic; the two inputs of OR gate M4 are connected to the outputs of AND gate M1 and AND gate M3; the input of NOT gate M5 receives the first logic, and its output, after passing through capacitor C7, is connected to one end of resistor R18 and one end of resistor R20; the other end of resistor R18... The other end of capacitor C6 is connected to the two inputs of OR gate M6; the delayed pulse passes through capacitor C9 and is connected to one end of resistor R21 and one end of resistor R22; the other end of resistor R21 and the output of OR gate M6 are respectively connected to the two inputs of OR gate M7; the output of OR gate M7 is connected to the TR+ input of multivibrator U5; the output Q1 of multivibrator U5 and the output of OR gate M4 are respectively connected to the two inputs of OR gate M8; the output of OR gate M8 is used as the output; the other ends of resistor R20 and resistor R22 are grounded.

3. The automatic control logic circuit for a storage battery according to claim 1, characterized in that, The peripheral circuit of the multivibrator U5 includes: resistor R19, capacitor C8, and diode D11, where, The RxCx(1) pin of the multivibrator U5 is connected to one end of the resistor R19, one end of the capacitor C8 and the anode of the diode D11; the other end of the resistor R19 and the cathode of the diode D11 are connected to the output of the power conversion circuit; the other end of the capacitor C8 is grounded to the Cx1 pin of the multivibrator U5.

4. The battery automatic control logic circuit according to claim 1, characterized in that, Resistors R18 and R21 are used for current limiting; resistors R22 and R20 stabilize the input signal at ground level when there is no output at the front end.

5. An automatic control method for a storage battery, characterized in that, The method is executed by means of the battery automatic control logic circuit according to any one of claims 1-4, and the method includes: Step 1: The battery power and each main power source are converted into internal power through a power conversion circuit to supply power to each circuit; Step 2: The external power supply status determination circuit calculates the power supply status of each main power supply to form the first logic; Step 3: The discrete logic conversion circuit receives the emergency mode switch and calculates it to form the second logic; it receives the air mode and battery switch and calculates them to form the third logic. Step 4: After the TRU state is isolated by the isolation circuit, it enters the logic judgment circuit and delay circuit together with the three logic circuits to form a drive control signal input to the drive circuit, thereby realizing the power supply and power cut-off of the battery power supply.

6. The method according to claim 5, characterized in that, The first logic, specifically: When the output voltage of any main power supply is greater than or equal to a predetermined threshold, the external power supply status logic signal outputs a high level; when the output voltage of each main power supply is less than the predetermined threshold, the external power supply status logic signal outputs a low level.

7. The method according to claim 6, characterized in that, The predetermined threshold is 21.2V.

8. The method according to claim 5, characterized in that, In step 3: When the emergency mode input is low, the second logic is low; otherwise, it is high. When the battery switch or air mode output is low, the third logic is low; otherwise, it is high.

9. The method according to claim 5, characterized in that, In step 4, the conditions for achieving battery power supply are met simultaneously: 1) The main power supply output voltage is less than the predetermined threshold or the TRU is offline; 2) Any of the following signals is valid: emergency mode, battery switch, or air mode.

10. The method according to claim 9, characterized in that, In step 4, the logic judgment circuit and delay circuit will disconnect the battery after a delay if any of the following conditions are met: 1) When any main power supply voltage recovers to a predetermined threshold; 2) Both the second and third logic logics transition from low to high level; 3) The delay pulse output by the main control chip is valid.

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