A battery detection system and method with high adaptability

Abstract

The present invention provides a highly adaptable battery detection system and method, comprising a power input port and a detection interface; a BUCK circuit connected to the detection interface; a voltage detection circuit and a current detection circuit connected to the BUCK circuit; a first A / D converter connected to the voltage detection circuit; a second A / D converter connected to the current detection circuit; a controller connected to the first A / D converter and the second A / D converter; an inverting buck conversion circuit connected to the power input port; a DC / DC converter connected to the power input port; and a MOS tube drive circuit connected to the controller; the negative electrode of the current detection circuit is connected to the output end of the inverting buck conversion circuit; the positive electrode of the voltage detection circuit, the positive electrode of the current detection circuit and the positive electrode of the MOS tube drive circuit are all connected to the output end of the DC / DC converter; the MOS tube drive circuit is connected to the BUCK circuit and is used to provide a PWM control signal for the BUCK circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and in particular to a battery testing system and method with high adaptability. Background Art

[0002] Testing is the last link in lithium battery production and a key step in battery formation. The current battery testing system includes battery formation and testing functions for a wide range of single batteries, battery modules and high-voltage battery packs. The test equipment is required to include precise test control circuits and data acquisition systems. However, batteries in different applications will have relatively large differences in size, voltage and appearance, so manufacturers must purchase and maintain test systems for corresponding battery types, which increases production costs. Therefore, it is necessary to provide a solution to more conveniently test various types of batteries to reduce production costs. Summary of the invention

[0003] The object of the present invention is to provide a battery detection system and method with high adaptability, so as to achieve the technical effect of more conveniently detecting various types of batteries to reduce production costs.

[0004] In the first aspect, the present invention provides a battery detection system with high adaptability, including a power input port and a detection interface; a BUCK circuit connected to the detection interface; a voltage detection circuit and a current detection circuit connected to the BUCK circuit; a first A / D converter connected to the voltage detection circuit; a second A / D converter connected to the current detection circuit; a controller connected to the first A / D converter and the second A / D converter; an inverting buck conversion circuit connected to the power input port; a DC / DC converter connected to the power input port; and a MOS tube drive circuit connected to the controller; the negative electrode of the current detection circuit is connected to the output end of the inverting buck conversion circuit; the positive electrode of the voltage detection circuit, the positive electrode of the current detection circuit and the positive electrode of the MOS tube drive circuit are all connected to the output end of the DC / DC converter; the MOS tube drive circuit is connected to the BUCK circuit to provide a PWM control signal for the BUCK circuit.

[0005] Furthermore, the BUCK circuit includes a first LC filter circuit, a first NMOS tube, a second NMOS tube, a sampling resistor, a voltage stabilizing filter circuit, a current detection filter circuit, a voltage detection filter circuit, a current detection port and a voltage detection port; the input end of the first LC filter circuit is connected to the detection interface; the drain of the first NMOS tube is connected to the output end of the first LC filter circuit; the drain of the second NMOS tube is connected to the source of the first NMOS tube; the source of the second NMOS tube is grounded; the input end of the voltage stabilizing filter circuit is connected to the source of the first NMOS tube; the first end of the sampling resistor and the positive electrode of the current detection port are both connected to the stabilizing The output end of the voltage detection filter circuit is connected; the input end of the voltage detection filter circuit and the negative electrode of the current detection port are both connected to the second end of the sampling resistor; the current detection filter circuit is arranged between the positive and negative electrodes of the current detection port; the positive electrode of the voltage detection port is connected to the output end of the voltage detection filter circuit; the negative electrode of the voltage detection port is grounded; the gate of the first NMOS tube is connected to the first output port of the MOS tube drive circuit; the gate of the second NMOS tube is connected to the second output port of the MOS tube drive circuit; the drain of the second NMOS tube and the source of the first NMOS tube are both connected to the conversion control port of the MOS tube drive circuit.

[0006] Furthermore, the voltage stabilizing and filtering circuit includes a voltage stabilizing diode, a first resistor, a first capacitor and a first inductor; the cathode of the voltage stabilizing diode, the first end of the first resistor and the first end of the first inductor are all connected to the source of the first NMOS tube; the second end of the first resistor is connected to the first end of the first capacitor; the second end of the first capacitor and the anode of the voltage stabilizing diode are both grounded; the first end of the sampling resistor and the anode of the current detection port are both connected to the second end of the first inductor.

[0007] Furthermore, the voltage detection filter circuit includes a plurality of filter capacitors arranged between the second end of the sampling resistor and the negative electrode of the voltage detection port, and a fuse arranged between the second end of the sampling resistor and the positive electrode of the voltage detection port.

[0008] Furthermore, the current detection filter circuit is a multi-order RC filter circuit.

[0009] Further, the MOS tube driving circuit includes a driver, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first grounding resistor, a second grounding resistor, a first diode, a second diode, a third diode, a second capacitor and a third capacitor; the power pin of the driver, the positive electrode of the first diode and the first end of the second capacitor are all connected to the output end of the DC / DC converter; the second end of the second capacitor is grounded; the HB pin of the driver and the first end of the third capacitor are all connected to the negative electrode of the first diode; the first end of the second resistor, the first end of the third resistor and the first end of the fourth resistor are all connected to the gate of the first NMOS tube; the second end of the second resistor, the second end of the third capacitor, the source of the first NMOS tube and The drain of the second NMOS tube is connected to the HS pin of the driver; the second end of the third resistor is connected to the anode of the second diode; the cathode of the second diode and the second end of the fourth resistor are connected to the HO pin of the driver; the first end of the fifth resistor, the first end of the sixth resistor and the first end of the seventh resistor are connected to the gate of the second NMOS tube; the second end of the fifth resistor is grounded; the second end of the seventh resistor is connected to the anode of the third diode; the cathode of the third diode and the second end of the sixth resistor are connected to the LO pin of the driver; the first grounding resistor is connected to the HI pin of the driver; the second grounding resistor is connected to the LI pin of the driver; the LI pin and HI pin of the driver are connected to the controller.

[0010] Furthermore, the current detection circuit includes a second capacitor filter circuit, a third capacitor filter circuit, a first output filter circuit and an instrument amplifier; the non-inverting input terminal of the instrument amplifier is connected to the positive electrode of the current detection port; the inverting input terminal of the instrument amplifier is connected to the negative electrode of the current detection port; the negative electrode of the instrument amplifier is connected to the output terminal of the inverting buck conversion circuit; the second capacitor filter circuit is connected to the negative electrode of the instrument amplifier; the positive electrode of the instrument amplifier is connected to the output terminal of the DC / DC converter; the third capacitor filter circuit is connected to the positive electrode of the instrument amplifier; the output terminal of the instrument amplifier is connected to the input terminal of the first output filter circuit; and the output terminal of the first output filter circuit is connected to the second A / D converter.

[0011] Further, the voltage detection circuit includes an operational amplifier, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a second output filter circuit; the first end of the eighth resistor and the first end of the fourth capacitor are both connected to the positive electrode of the voltage detection port; the first end of the ninth resistor and the in-phase input terminal of the operational amplifier are both connected to the second end of the eighth resistor; the second end of the fourth capacitor, the second end of the ninth resistor and the negative electrode of the operational amplifier are all grounded; the positive electrode of the operational amplifier and the first end of the fifth capacitor are both connected to the output terminal of the DC / DC converter; the second end of the fifth capacitor is grounded; the first end of the tenth resistor is connected to the negative electrode of the voltage detection port; the second end of the tenth resistor, the first end of the eleventh resistor and the first end of the sixth capacitor are all connected to the inverting input terminal of the operational amplifier; the second end of the eleventh resistor, the second end of the sixth capacitor and the input terminal of the second output filter circuit are all connected to the output terminal of the operational amplifier; the output terminal of the second output filter circuit is connected to the first A / D converter.

[0012] Furthermore, the inverting buck conversion circuit includes a π-type filter circuit, an inverting buck converter and a second LC filter circuit; the first end of the π-type filter circuit is connected to the power input port; the second end of the π-type filter circuit is connected to the input end and the enable end of the inverting buck converter; the SW pin of the inverting buck converter is connected to the input end of the second LC filter circuit; the output end of the second LC filter circuit and the output end of the inverting buck converter are both connected to the negative pole of the current detection circuit.

[0013] In a second aspect, the present invention provides a battery detection method with high adaptability:

[0014] Connect the battery to be tested to the test interface;

[0015] Input a control signal to the MOS tube driving circuit through the controller;

[0016] The MOS tube driving circuit outputs a PWM control signal to the first NMOS tube and the second NMOS tube in the BUCK circuit according to the control signal, thereby controlling the voltage detection circuit and the current detection circuit to perform detection;

[0017] The voltage detection signal of the voltage detection circuit is processed by the first A / D converter and then sent to the controller; the current detection signal of the current detection circuit is processed by the second A / D converter and then sent to the controller;

[0018] The controller analyzes the signals processed by the first A / D converter and the second A / D converter and outputs the detection result of the battery to be tested.

[0019] The beneficial effects that can be achieved by the present invention are as follows: the controller in the highly adaptable battery detection system provided by the present invention can control the BUCK circuit to open the voltage detection circuit and the current detection circuit to detect the voltage and current of the battery through the MOS tube drive circuit provided, and can adaptively adjust the PWM waveform output by the MOS tube drive circuit according to the detected voltage and current values. Through a set of detection systems, various types of batteries can be detected, which makes it more convenient to detect various types of batteries while reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A topological structure diagram of a highly adaptable battery detection system provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a BUCK circuit provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of a MOS tube driving circuit provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a voltage detection circuit provided by an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of a current detection circuit provided by an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of an inverting buck converter circuit provided by an embodiment of the present invention;

[0027] Figure 7 A schematic flow chart of a highly adaptable battery detection method provided by an embodiment of the present invention.

[0028] Icons: 10-battery detection system; 100-BUCK circuit; 110-detection interface; 200-voltage detection circuit; 300-MOS tube drive circuit; 400-current detection circuit; 500-inverting buck conversion circuit; 510-power input port; 600-DC / DC converter; 700-first A / D converter; 800-second A / D converter; 900-controller. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0031] Please see Figure 1 , Figure 1 A topological structure diagram of a battery detection system with high adaptability provided by an embodiment of the present invention.

[0032] In one embodiment, the present invention provides a highly adaptable battery detection system 10, which includes a power input port 510 and a detection interface 110; a BUCK circuit 100 connected to the detection interface 110; a voltage detection circuit 200 and a current detection circuit 400 connected to the BUCK circuit 100; a first A / D converter 700 connected to the voltage detection circuit 200; a second A / D converter 800 connected to the current detection circuit 400; a controller 900 connected to the first A / D converter 700 and the second A / D converter 800; and a power input port 510 and a detection interface 110. The inverting buck converter circuit 500 is connected to the power input port 510; the DC / DC converter 600 is connected to the power input port 510; and the MOS tube drive circuit 300 is connected to the controller 900; the negative electrode of the current detection circuit 400 is connected to the output end of the inverting buck converter circuit 500; the positive electrode of the voltage detection circuit 200, the positive electrode of the current detection circuit 400 and the positive electrode of the MOS tube drive circuit 300 are all connected to the output end of the DC / DC converter 600; the MOS tube drive circuit 300 is connected to the BUCK circuit 100, and is used to provide a PWM control signal for the BUCK circuit 100.

[0033] In the above implementation process, the controller 900 can control the BUCK circuit 100 to turn on the voltage detection circuit 200 and the current detection circuit 400 to detect the voltage and current of the battery through the set MOS tube driving circuit 300, and can adaptively adjust the PWM waveform output by the MOS tube driving circuit 300 according to the detected voltage and current values, so as to meet the needs of detecting different types of batteries.

[0034] Please see Figure 2 , Figure 2 A schematic diagram of a BUCK circuit provided in an embodiment of the present invention.

[0035] In one implementation, the BUCK circuit 100 provided in the embodiment of the present invention includes a first LC filter circuit, a first NMOS tube Q1, a second NMOS tube Q2, a sampling resistor R8, a voltage stabilizing filter circuit, a current detection filter circuit, a voltage detection filter circuit, a current detection port (including a positive electrode (CS+) and a negative electrode (CS-)) and a voltage detection port (including a positive electrode (B+) and a negative electrode (B-)); the input end of the first LC filter circuit is connected to the detection interface 110; the drain of the first NMOS tube Q1 is connected to the output end of the first LC filter circuit; the drain of the second NMOS tube is connected to the source of the first NMOS tube Q1; the source of the second NMOS tube Q2 is grounded; the input end of the voltage stabilizing filter circuit is connected to the source of the first NMOS tube Q1; the sampling resistor The first end of R8 and the positive electrode (CS+) of the current detection port are both connected to the output end of the voltage stabilizing filter circuit; the input end of the voltage detection filter circuit and the negative electrode (CS-) of the current detection port are both connected to the second end of the sampling resistor R8; the current detection filter circuit is arranged between the positive and negative electrodes of the current detection port; the positive electrode (B+) of the voltage detection port is connected to the output end of the voltage detection filter circuit; the negative electrode (B-) of the voltage detection port is grounded; the gate of the first NMOS tube Q1 is connected to the first output port of the MOS tube driving circuit 300; the gate of the second NMOS tube Q2 is connected to the second output port of the MOS tube driving circuit 300; the drain of the second NMOS tube Q2 and the source of the first NMOS tube Q1 are both connected to the conversion control port of the MOS tube driving circuit 300.

[0036] For example, Figure 2 As shown, the first LC filter circuit is composed of an inductor L2, a capacitor C6, a capacitor C3 and a capacitor C4. The voltage stabilizing filter circuit includes a voltage stabilizing diode D3, a first resistor R9, a first capacitor C11 and a first inductor L1; the cathode of the voltage stabilizing diode D3, the first end of the first resistor R9 and the first end of the first inductor L1 are all connected to the source of the first NMOS tube Q1; the second end of the first resistor R9 is connected to the first end of the first capacitor C11; the second end of the first capacitor C11 and the anode of the voltage stabilizing diode D3 are both grounded; the first end of the sampling resistor R8 and the anode (CS+) of the current detection port are both connected to the second end of the first inductor L1. The voltage detection filter circuit includes a plurality of filter capacitors (including capacitors C7, C8 and C9) arranged between the second end of the sampling resistor R8 and the cathode (B-) of the voltage detection port, and a fuse F1 arranged between the second end of the sampling resistor and the anode of the voltage detection port. The current detection filter circuit is a multi-order RC filter circuit (such as Figure 2 As shown, the multi-order RC filter circuit is composed of a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a resistor R6 and a resistor R7).

[0037] In the above implementation process, the voltage and current of the battery can be detected by controlling the first NMOS transistor Q1 and the second NMOS transistor Q2, and the detection result can be made more accurate by setting the voltage stabilizing filter circuit, the voltage detection filter circuit, the current detection filter circuit, etc. In addition, a fuse is also set in the voltage detection filter circuit to protect the circuit.

[0038] Please see Figure 3 , Figure 3 A schematic diagram of a MOS tube driving circuit provided by an embodiment of the present invention.

[0039] In one implementation, the MOS transistor driving circuit 300 provided in the embodiment of the present invention includes a driver U1, a second resistor R11, a third resistor R12, a fourth resistor R13, a fifth resistor R1, a sixth resistor R2, a seventh resistor R3, a first grounding resistor R14, a second grounding resistor R10, a first diode D1, a second diode D4, a third diode D2, a second capacitor C5 and a third capacitor C10; the power pin of the driver U1, the positive electrode of the first diode D1 and the first end of the second capacitor are all connected to the output end of the DC / DC converter 600; the second end of the second capacitor is grounded; the HB pin of the driver U1 and the first end of the third capacitor are all connected to the negative electrode of the first diode D1; the first end of the second resistor R11, the first end of the third resistor R12 and the first end of the fourth resistor R13 are all connected to the gate of the first NMOS transistor; the second end of the second resistor R11 , the second end of the third capacitor, the source of the first NMOS tube and the drain of the second NMOS tube are all connected to the HS pin of the driver; the second end of the third resistor R12 is connected to the anode of the second diode D4; the cathode of the second diode D4 and the second end of the fourth resistor R13 are all connected to the HO pin of the driver U1; the first end of the fifth resistor R1, the first end of the sixth resistor R2 and the first end of the seventh resistor R3 are all connected to the gate of the second NMOS tube; the second end of the fifth resistor R1 is grounded; the second end of the seventh resistor R3 is connected to the anode of the third diode D2; the cathode of the third diode D2 and the second end of the sixth resistor R2 are all connected to the LO pin of the driver U1; the first grounding resistor R14 is connected to the HI pin of the driver U1; the second grounding resistor R10 is connected to the LI pin of the driver U1; the LI pin and HI pin of the driver U1 are connected to the controller 900.

[0040] In the above implementation process, the driver in the MOS tube driving circuit 300 can control the gate voltage of the first NMOS tube Q1 and the second NMOS tube Q2 according to the control signal sent by the controller 900, thereby controlling the voltage and current detection process; at the same time, the driver can also be adaptively adjusted according to the voltage between the source of the first NMOS tube Q1 and the drain of the second NMOS tube Q2, so that the battery can be detected more conveniently.

[0041] Please see Figure 4 , Figure 4 A schematic diagram of a voltage detection circuit provided by an embodiment of the present invention.

[0042] In one implementation, the voltage detection circuit 200 provided in the embodiment of the present invention includes an operational amplifier U4, an eighth resistor R31, a ninth resistor R28, a tenth resistor R32, an eleventh resistor R33, a fourth capacitor C33, a fifth capacitor C34, a sixth capacitor C35, and a second output filter circuit; the first end of the eighth resistor R31 and the first end of the fourth capacitor C33 are both connected to the positive electrode (B+) of the voltage detection port; the first end of the ninth resistor R28 and the in-phase input terminal of the operational amplifier U4 are both connected to the second end of the eighth resistor R31; the second end of the fourth capacitor C33, the second end of the ninth resistor R28 and the negative pole of the operational amplifier U4 The positive poles of the operational amplifier U4 and the first end of the fifth capacitor C34 are connected to the output end of the DC / DC converter 600; the second end of the fifth capacitor C34 is grounded; the first end of the tenth resistor R32 is connected to the negative pole of the voltage detection port; the second end of the tenth resistor R32, the first end of the eleventh resistor R33 and the first end of the sixth capacitor C35 are connected to the inverting input end of the operational amplifier U4; the second end of the eleventh resistor R33, the second end of the sixth capacitor C35 and the input end of the second output filter circuit are connected to the output end of the operational amplifier U4; the output end of the second output filter circuit is connected to the first A / D converter 700.

[0043] By adopting the above method, when the voltage of the battery is detected, the detection result can be guaranteed to be more accurate.

[0044] Please see Figure 5 , Figure 5 A schematic diagram of a current detection circuit provided by an embodiment of the present invention.

[0045] In one embodiment, the current detection circuit 400 provided in an embodiment of the present invention includes: a second capacitor filter circuit, a third capacitor filter circuit, a first output filter circuit and an instrument amplifier U3; the in-phase input terminal of the instrument amplifier U3 is connected to the positive electrode of the current detection port; the inverting input terminal of the instrument amplifier U3 is connected to the negative electrode of the current detection port; the negative electrode of the instrument amplifier U3 is connected to the output terminal of the inverting buck conversion circuit 500; the second capacitor filter circuit is connected to the negative electrode of the instrument amplifier U3; the positive electrode of the instrument amplifier U3 is connected to the output terminal of the DC / DC converter 600; the third capacitor filter circuit is connected to the positive electrode of the instrument amplifier U3; the output terminal of the instrument amplifier U3 is connected to the input terminal of the first output filter circuit; the output terminal of the first output filter circuit is connected to the second A / D converter 800.

[0046] Specifically, Figure 5 As shown, the second capacitor filter circuit is composed of grounded capacitors C12 and C13. The third capacitor filter circuit is composed of grounded capacitors C30 and C26; the first output filter circuit is composed of resistor R19, resistor R20, capacitor C27, capacitor C29, resistor R23 and resistor R24.

[0047] In the above implementation process, the multiple filter circuits provided can fully filter out interference signals in the circuit, so that the detected current value is more accurate.

[0048] Please see Figure 6 , Figure 6 A schematic diagram of an inverting buck converter circuit provided in an embodiment of the present invention.

[0049] In one embodiment, the inverting buck conversion circuit 500 provided in an embodiment of the present invention includes a π-type filter circuit, an inverting buck converter and a second LC filter circuit; the first end of the π-type filter circuit is connected to the power input port 510; the second end of the π-type filter circuit is connected to the input end and the enable end of the inverting buck converter; the SW pin of the inverting buck converter is connected to the input end of the second LC filter circuit; the output end of the second LC filter circuit and the output end of the inverting buck converter are both connected to the negative pole of the current detection circuit 400.

[0050] Specifically, Figure 6 As shown, the π-type filter circuit can be a π-type LC filter circuit composed of inductor L3, capacitor C28, capacitor C29, capacitor C30, capacitor C31, capacitor C32, etc. The second LC filter circuit is composed of inductor L4, capacitor C34, capacitor C35, capacitor C36, etc.

[0051] In the above implementation process, the interference voltage signal in the circuit can be fully filtered out by the provided π-type filter circuit and the second LC filter circuit.

[0052] Please see Figure 7 , Figure 7 A schematic flow chart of a highly adaptable battery detection method provided by an embodiment of the present invention.

[0053] In one implementation, the present invention also provides a highly adaptable battery detection method, which is applied to the above-mentioned battery detection system, and its specific contents include:

[0054] S1. Connect the battery to be tested to the test interface.

[0055] Specifically, the detection interface can be set to various types according to actual needs to meet the detection requirements of different batteries.

[0056] S2. Input a control signal to the MOS tube driving circuit through the controller.

[0057] For example, the controller can be connected to a touch panel, and the controller can have built-in detection configuration parameters for multiple types of batteries. The user can select the battery type through the touch panel before detection, and then the controller automatically inputs control signals to the MOS tube drive circuit according to the built-in detection configuration parameters.

[0058] S3. The MOS tube driving circuit outputs a PWM control signal to the first NMOS tube and the second NMOS tube in the BUCK circuit according to the control signal, thereby controlling the voltage detection circuit and the current detection circuit to perform detection.

[0059] Specifically, after receiving the control signal, the MOS tube driving circuit can output a PWM control signal to the first NMOS tube and the second NMOS tube in the BUCK circuit according to the control signal, thereby controlling the voltage detection circuit and the current detection circuit to perform detection. At the same time, the driver in the MOS tube driving circuit can also adaptively adjust the PWM control signals of the first NMOS tube and the second NMOS tube according to the voltage between the source of the first NMOS tube and the drain of the second NMOS tube, so as to make the detection result more accurate.

[0060] S4. The voltage detection signal of the voltage detection circuit is processed by the first A / D converter and then sent to the controller; the current detection signal of the current detection circuit is processed by the second A / D converter and then sent to the controller.

[0061] S5. The controller analyzes the signals processed by the first A / D converter and the second A / D converter and outputs the detection result of the battery to be tested.

[0062] Specifically, the controller may compare and analyze the detection data with the preset detection standard and fault type to obtain the detection result of the battery to be tested.

[0063] In summary, the embodiment of the present invention provides a highly adaptable battery detection system, including a power input port and a detection interface; a BUCK circuit connected to the detection interface; a voltage detection circuit and a current detection circuit connected to the BUCK circuit; a first A / D converter connected to the voltage detection circuit; a second A / D converter connected to the current detection circuit; a controller connected to the first A / D converter and the second A / D converter; an inverting buck conversion circuit connected to the power input port; a DC / DC converter connected to the power input port; and a MOS tube drive circuit connected to the controller; the negative electrode of the current detection circuit is connected to the output end of the inverting buck conversion circuit; the positive electrode of the voltage detection circuit, the positive electrode of the current detection circuit, and the positive electrode of the MOS tube drive circuit are all connected to the output end of the DC / DC converter; the MOS tube drive circuit is connected to the BUCK circuit to provide a PWM control signal for the BUCK circuit. In the above manner, various types of batteries can be detected more conveniently while reducing production costs.

[0064] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A highly adaptable battery detection system, characterized in that: It includes a power input port and a detection interface; a BUCK circuit connected to the detection interface; a voltage detection circuit and a current detection circuit connected to the BUCK circuit; and a first A / D converter connected to the voltage detection circuit; a second A / D converter connected to the current detection circuit; a controller connected to the first A / D converter and the second A / D converter; an inverting buck converter connected to the power input port; a DC / DC converter connected to the power input port; and a MOS tube driving circuit connected to the controller; the negative electrode of the current detection circuit is connected to the output end of the inverting buck conversion circuit; the positive electrode of the voltage detection circuit, the positive electrode of the current detection circuit and the positive electrode of the MOS tube driving circuit are all connected to the output end of the DC / DC converter; the MOS tube driving circuit is connected to the BUCK circuit to provide a PWM control signal for the BUCK circuit; the BUCK circuit includes a first LC filter circuit, a first NMOS tube, a second NMOS tube, a sampling resistor, a voltage stabilizing filter circuit, a current detection filter circuit, a voltage detection filter circuit, a current detection port and a voltage detection port; the input end of the first LC filter circuit is connected to the detection interface; the drain of the first NMOS tube is connected to the output end of the first LC filter circuit; the drain of the second NMOS tube is connected to the source of the first NMOS tube The source of the second NMOS tube is grounded; the input end of the voltage stabilizing filter circuit is connected to the source of the first NMOS tube; the first end of the sampling resistor and the positive electrode of the current detection port are both connected to the output end of the voltage stabilizing filter circuit; the input end of the voltage detection filter circuit and the negative electrode of the current detection port are both connected to the second end of the sampling resistor; the current detection filter circuit is arranged between the positive and negative electrodes of the current detection port; the positive electrode of the voltage detection port is connected to the output end of the voltage detection filter circuit; the negative electrode of the voltage detection port is grounded; the gate of the first NMOS tube is connected to the first output port of the MOS tube driving circuit; the gate of the second NMOS tube is connected to the second output port of the MOS tube driving circuit; the drain of the second NMOS tube and the source of the first NMOS tube are both connected to the conversion control port of the MOS tube driving circuit.

2. The battery detection system according to claim 1, characterized in that: The voltage stabilizing and filtering circuit includes a voltage stabilizing diode, a first resistor, a first capacitor and a first inductor; the cathode of the voltage stabilizing diode, the first end of the first resistor and the first end of the first inductor are all connected to the source of the first NMOS tube; the second end of the first resistor is connected to the first end of the first capacitor; the second end of the first capacitor and the anode of the voltage stabilizing diode are both grounded; the first end of the sampling resistor and the anode of the current detection port are both connected to the second end of the first inductor.

3. The battery detection system according to claim 1, characterized in that: The voltage detection filter circuit includes a plurality of filter capacitors arranged between the second end of the sampling resistor and the negative electrode of the voltage detection port, and a fuse arranged between the second end of the sampling resistor and the positive electrode of the voltage detection port.

4. The battery detection system according to claim 1, characterized in that: The current detection filter circuit is a multi-order RC filter circuit.

5. The battery detection system according to claim 1, characterized in that: The MOS tube driving circuit includes a driver, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first grounding resistor, a second grounding resistor, a first diode, a second diode, a third diode, a second capacitor and a third capacitor; the power pin of the driver, the positive electrode of the first diode and the first end of the second capacitor are all connected to the output end of the DC / DC converter; the second end of the second capacitor is grounded; the HB pin of the driver and the first end of the third capacitor are all connected to the negative electrode of the first diode; the first end of the second resistor, the first end of the third resistor and the first end of the fourth resistor are all connected to the gate of the first NMOS tube; the second end of the second resistor, the second end of the third capacitor, the source of the first NMOS tube and the The drain of the second NMOS tube is connected to the HS pin of the driver; the second end of the third resistor is connected to the anode of the second diode; the cathode of the second diode and the second end of the fourth resistor are connected to the HO pin of the driver; the first end of the fifth resistor, the first end of the sixth resistor and the first end of the seventh resistor are connected to the gate of the second NMOS tube; the second end of the fifth resistor is grounded; the second end of the seventh resistor is connected to the anode of the third diode; the cathode of the third diode and the second end of the sixth resistor are connected to the LO pin of the driver; the first grounding resistor is connected to the HI pin of the driver; the second grounding resistor is connected to the LI pin of the driver; the LI pin and HI pin of the driver are connected to the controller.

6. The battery detection system according to claim 1, characterized in that: The current detection circuit includes a second capacitor filter circuit, a third capacitor filter circuit, a first output filter circuit and an instrument amplifier; the non-inverting input terminal of the instrument amplifier is connected to the positive electrode of the current detection port; the inverting input terminal of the instrument amplifier is connected to the negative electrode of the current detection port; the negative electrode of the instrument amplifier is connected to the output terminal of the inverting buck conversion circuit; the second capacitor filter circuit is connected to the negative electrode of the instrument amplifier; the positive electrode of the instrument amplifier is connected to the output terminal of the DC / DC converter; the third capacitor filter circuit is connected to the positive electrode of the instrument amplifier; the output terminal of the instrument amplifier is connected to the input terminal of the first output filter circuit; and the output terminal of the first output filter circuit is connected to the second A / D converter.

7. The battery detection system according to claim 1, characterized in that: The voltage detection circuit includes an operational amplifier, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a second output filter circuit; the first end of the eighth resistor and the first end of the fourth capacitor are both connected to the positive electrode of the voltage detection port; the first end of the ninth resistor and the non-inverting input terminal of the operational amplifier are both connected to the second end of the eighth resistor; the second end of the fourth capacitor, the second end of the ninth resistor and the negative electrode of the operational amplifier are all grounded; the positive electrode of the operational amplifier and the first end of the fifth capacitor are both connected to the output terminal of the DC / DC converter; the second end of the fifth capacitor is grounded; the first end of the tenth resistor is connected to the negative electrode of the voltage detection port; the second end of the tenth resistor, the first end of the eleventh resistor and the first end of the sixth capacitor are all connected to the inverting input terminal of the operational amplifier; the second end of the eleventh resistor, the second end of the sixth capacitor and the input terminal of the second output filter circuit are all connected to the output terminal of the operational amplifier; the output terminal of the second output filter circuit is connected to the first A / D converter.

8. The battery detection system according to claim 1, characterized in that: The inverting buck conversion circuit includes a π-type filter circuit, an inverting buck converter and a second LC filter circuit; the first end of the π-type filter circuit is connected to the power input port; the second end of the π-type filter circuit is connected to the input end and the enable end of the inverting buck converter; the SW pin of the inverting buck converter is connected to the input end of the second LC filter circuit; the output end of the second LC filter circuit and the output end of the inverting buck converter are both connected to the negative pole of the current detection circuit.

9. A highly adaptable battery detection method, applied to the battery detection system according to any one of claims 1 to 8, characterized in that: include: Connect the battery to be tested to the test interface; Input a control signal to the MOS tube driving circuit through the controller; The MOS tube driving circuit outputs a PWM control signal to the first NMOS tube and the second NMOS tube in the BUCK circuit according to the control signal, thereby controlling the voltage detection circuit and the current detection circuit to perform detection; The voltage detection signal of the voltage detection circuit is processed by the first A / D converter and then sent to the controller; the current detection signal of the current detection circuit is processed by the second A / D converter and then sent to the controller; The controller analyzes the signals processed by the first A / D converter and the second A / D converter and outputs the detection result of the battery to be tested.

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