Integrated sampling circuit of capacity checking device

Abstract

The utility model provides an integrated sampling circuit of a capacity checking device, which meets the requirement of collecting each electric parameter in the capacity checking process of a storage battery pack, comprises a main control chip for calculating the electric parameters, and is characterized in that the main control chip is connected with a current sampling module and a voltage sampling module; the current sampling module comprises a first electrostatic protection circuit and a first operational amplifier circuit, the input end of the first electrostatic protection circuit is connected with a current sampling terminal, the output end of the first electrostatic protection circuit is connected with the input end of the first operational amplifier circuit, and the current sampling terminal is used for being externally connected with a Hall current sensor; the voltage sampling module comprises a diode voltage drop sampling module and a battery pack voltage sampling module; the diode voltage drop sampling module comprises a second electrostatic protection circuit and a second operational amplifier circuit, the input end of the second electrostatic protection circuit is connected with the first voltage sampling terminal, and the output end of the second electrostatic protection circuit is connected with the input end of the second operational amplifier circuit.

Description

Technical Field

[0001] The utility model relates to an integrated sampling circuit of a core capacitance device. Background Art

[0002] During the battery pack capacity verification process, real-time current and voltage data must be acquired for calculation. Furthermore, because a sampling diode is located between the battery pack and the capacity verification device, the voltage across the diode must also be captured for calculation purposes. However, existing capacity verification devices often only provide one set of battery current sampling ports and one set of battery voltage sampling terminals. This not only allows testing of only one battery pack at a time, but also prevents the voltage across the diode from being collected as a calculation parameter. Utility Model Content

[0003] The utility model proposes an integrated sampling circuit for a capacity checking device, which meets the requirements for collecting various electrical parameters during the capacity checking process of a battery pack. The circuit is specifically implemented by the following technical means:

[0004] An integrated sampling circuit for a core capacitor device includes a main control chip for calculating electrical parameters, wherein the main control chip is connected to a current sampling module and a voltage sampling module;

[0005] The current sampling module includes a first electrostatic protection circuit and a first operational amplifier circuit. The input end of the first electrostatic protection circuit is connected to the current sampling terminal, and the output end thereof is connected to the input end of the first operational amplifier circuit. The output end of the first operational amplifier circuit is connected to the main control chip. The current sampling terminal is used to connect to an external Hall current sensor.

[0006] The voltage sampling module includes a diode voltage drop sampling module and a battery pack voltage sampling module;

[0007] The diode voltage drop sampling module includes a second electrostatic protection circuit and a second operational amplifier circuit, wherein the input end of the second electrostatic protection circuit is connected to the first voltage sampling terminal, and the output end thereof is connected to the input end of the second operational amplifier circuit, and the output end of the second operational amplifier circuit is connected to the main control chip;

[0008] The battery pack voltage sampling module includes a first resistive voltage divider circuit, an input end of the first resistive voltage divider circuit is connected to the second voltage sampling terminal, and an output end of the first resistive voltage divider circuit is connected to the main control chip.

[0009] In one or more embodiments of the present invention, the first operational amplifier circuit includes an operational amplifier U33A, an input resistor R106, an input resistor R108, an input capacitor C55, an input capacitor C59, an output resistor R104, and an output capacitor C56. One end of the input resistor R106 is connected to the current sampling terminal, and the other end is connected to the input resistor R108. The other end of the resistor R108 is grounded. The operational amplifier U33A adopts a negative feedback structure, with its non-inverting input end connected to the common end of the input resistor R106 and the input resistor R108. One end of the output resistor R104 is connected to the output end of the operational amplifier U33A, and the other end is connected to the output end of the first operational amplifier circuit. One end of the output capacitor C56 is connected to the output resistor R104, and the other end is grounded.

[0010] In one or more embodiments of the present invention, the first electrostatic protection circuit includes a diode TVS12 and a diode TVS14, the current sampling terminal has a high-voltage pin connected to VCC and a low-voltage pin connected to the first operational amplifier circuit, one end of the diode TVS12 is connected to the high-voltage pin of the current sampling terminal, and the other end is grounded; one end of the diode TVS14 is connected to the low-voltage pin of the current sampling terminal, and the other end is grounded; the diode TVS12 and the diode TVS14 are both transient voltage suppression diodes.

[0011] In one or more embodiments of the present invention, capacitors C53 and C54 are connected in parallel across the diode TVS1 2 .

[0012] In one or more embodiments of the present invention, the second operational amplifier circuit includes an operational amplifier U34A, resistors R109, R110, R111, R112, and capacitor C60. The non-inverting input terminal of the operational amplifier U34A is connected to one pin of the first voltage sampling terminal via resistor R111, and the negative input terminal of the operational amplifier U34A is connected to the other pin of the first voltage sampling terminal via resistor R110. Resistor R109 is connected between the output terminal and the negative input terminal of the operational amplifier U34A. Capacitor C60 is connected in parallel with resistor R109. One end of resistor R112 is connected to the non-inverting input terminal of the operational amplifier U34A. The other end is connected to a reference voltage.

[0013] In one or more embodiments of the present invention, the second operational amplifier circuit further includes a reference voltage circuit for providing the reference voltage. The reference voltage circuit includes an operational amplifier U34D, a resistor R113, a resistor R115, and a capacitor C145. The resistors R113 and R115 are connected in series between VCC and ground, with a common terminal connected to the positive input terminal of the operational amplifier U34D, and the output terminal of the operational amplifier U34D is connected to the negative input terminal thereof. One end of the capacitor C145 is connected to the output terminal of the operational amplifier U34D, and the other end is grounded.

[0014] In one or more embodiments of the present invention, the second electrostatic protection circuit includes a diode ESD1 and a diode ESD2 , and the diode ESD1 and the diode ESD2 are respectively connected to ground two pins of the first voltage sampling terminal.

[0015] In one or more embodiments of the present invention, the first resistive voltage divider circuit includes a plurality of voltage divider resistors connected in series between the two pins of the second voltage sampling terminal, with a common end of the voltage divider resistors being used as the output end and a filter capacitor being connected to the output end; a varistor is also connected between the two pins of the second voltage sampling terminal.

[0016] Compared with existing technologies, the present invention's advantages lie in: in addition to a current sampling module for acquiring battery current and a battery pack voltage sampling module for acquiring battery voltage, it also features a diode voltage drop sampling module for acquiring the voltage across a diode. This meets the requirements for collecting various electrical parameters during the battery pack capacity verification process, resulting in more accurate calculated battery curves. Furthermore, electrostatic protection structures are added to both the current sampling module and the diode voltage drop sampling module to enhance the anti-interference and safety performance of the capacity verification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the circuit schematic diagram of the current sampling module.

[0018] Figure 2 This is the circuit schematic diagram of the diode voltage drop sampling module.

[0019] Figure 3 This is the circuit schematic diagram of the battery pack voltage sampling module. DETAILED DESCRIPTION

[0020] The following is combined with the attached Figures 1 to 3 , further describe this application plan:

[0021] An integrated sampling circuit for a capacity-checking device includes a main control chip for calculating electrical parameters. The main control chip is connected to a current sampling module and a voltage sampling module. The voltage sampling module includes a diode voltage drop sampling module and a battery pack voltage sampling module. Due to measurement requirements, two or more groups of the current sampling modules, diode voltage drop sampling modules, and battery pack voltage sampling modules are respectively provided. The obtained electrical parameter data is then calculated by the main control chip, so that the capacity-checking device can check the capacity of multiple battery packs simultaneously.

[0022] The current sampling module includes a first electrostatic protection circuit and a first operational amplifier circuit. The input end of the first electrostatic protection circuit is connected to the current sampling terminal, and the output end thereof is connected to the input end of the first operational amplifier circuit. The output end of the first operational amplifier circuit is connected to the main control chip. The current sampling terminal is used to connect to an external Hall current sensor. The current sampling module samples the current through the external Hall current sensor, amplifies the collected signal through operation, and then sends it to the main control chip to convert the current sampling current.

[0023] The diode voltage drop sampling module includes a second electrostatic protection circuit and a second operational amplifier circuit, wherein the input end of the second electrostatic protection circuit is connected to the first voltage sampling terminal, and the output end thereof is connected to the input end of the second operational amplifier circuit, and the output end of the second operational amplifier circuit is connected to the main control chip; the diode voltage drop sampling module collects the voltage difference between the positive and negative electrodes of the diode through a differential operational amplifier;

[0024] The battery pack voltage sampling module includes a first resistive voltage divider circuit, the input end of the first resistive voltage divider circuit is connected to the second voltage sampling terminal, and the output end is connected to the main control chip; the battery pack voltage sampling module obtains the battery pack voltage by providing it to the ADC of the main control chip through resistive voltage division.

[0025] In addition to the current sampling module for obtaining battery current and the battery pack voltage sampling module for obtaining battery voltage, this patent also has a diode voltage drop sampling module for obtaining the voltage across the acquisition diode, which meets the needs of collecting various electrical parameters during the remote online capacity verification process of the battery pack, making the calculated battery curve more accurate.

[0026] For details, see the attached Figure 1The first operational amplifier circuit includes an operational amplifier U33A, an input resistor R106, an input resistor R108, an input capacitor C55, an input capacitor C59, an output resistor R104, and an output capacitor C56. One end of the input resistor R106 is connected to the current sampling terminal P9, and the other end is connected to the input resistor R108. The other end of the resistor R108 is grounded. The operational amplifier U33A adopts a negative feedback structure, and its non-inverting input end is connected to the common end of the input resistor R106 and the input resistor R108. One end of the output resistor R104 is connected to the output end of the operational amplifier U33A. The other end is connected to the output end of the first operational amplifier circuit. One end of the output capacitor C56 is connected to the output resistor R104, and the other end is grounded. The first electrostatic protection circuit includes a diode TVS12, a diode TVS14, a capacitor C53 and a capacitor C54. The current sampling terminal P9 has a high-voltage pin connected to VCC and a low-voltage pin connected to the first operational amplifier circuit. One end of the diode TVS12 is connected to the high-voltage pin of the current sampling terminal P9, and the other end is grounded; one end of the diode TVS14 is connected to the low-voltage pin of the current sampling terminal P9, and the other end is grounded; the diode TVS12 and the diode TVS14 are both transient voltage suppression diodes, which can quickly respond to sudden changes in voltage, thereby effectively filtering out electrostatic damage; the capacitor C53 and the capacitor C54 are respectively connected to the two ends of the diode TVS12, playing the role of peak clipping filtering.

[0027] See attached Figure 2The second operational amplifier circuit includes an operational amplifier U34A, a resistor R109, a resistor R110, a resistor R111, a resistor R112 and a capacitor C60. The positive input terminal of the operational amplifier U34A is connected to one pin of the first voltage sampling terminal P10 via the resistor R111, and the negative input terminal of the operational amplifier U34A is connected to the other pin of the first voltage sampling terminal P10 via the resistor R110; a resistor R109 is connected between the output terminal and the negative input terminal of the operational amplifier U34A, and the capacitor C60 is connected to the resistor R109. R109 is connected in parallel to clip the negative feedback branch; one end of the resistor R112 is connected to the non-inverting input of the operational amplifier U34A, and the other end is connected to a reference voltage (e.g., +1.65V). The reference voltage is provided by a reference voltage circuit, which includes an operational amplifier U34D, a resistor R113, a resistor R115, and a capacitor C145. The resistors R113 and R115 are connected in series between VCC and ground, and their common end is connected to the non-inverting input of the operational amplifier U34D. The output of the operational amplifier U34D is connected to its negative input, and one end of the capacitor C145 is connected to the output of the operational amplifier U34D, and the other end is grounded. The second electrostatic protection circuit includes a diode ESD1 and a diode ESD2, which are respectively grounded to the two pins of the first voltage sampling terminal P10, and can quickly respond to sharp changes in voltage, thereby effectively filtering out electrostatic intrusions.

[0028] Electrostatic protection structures are added to the above-mentioned current sampling module and diode voltage drop sampling module, respectively, which improves the anti-interference performance and safety performance of the nuclear capacity device.

[0029] See attached Figure 3 The first resistive voltage divider circuit includes voltage divider resistors R181, R182 and R183 connected in series between the two pins of the second voltage sampling terminal P16. The common end of the voltage divider resistors R182 and R183 is connected to the main control chip as the output end, and a filter capacitor C122 is connected to the output end. At the same time, a varistor YMD2 is also connected between the two pins of the second voltage sampling terminal P16 to play the role of overvoltage protection.

[0030] As a preferred embodiment, the above-mentioned current sampling module, diode voltage drop sampling module and battery pack voltage sampling module can be directly integrated on the motherboard carrying the main control chip, and corresponding sampling terminals are set on the edge of the motherboard; or the current sampling module, diode voltage drop sampling module and battery pack voltage sampling module can be separately carried on the board and packaged into independent functional boards. These functional boards are connected to the motherboard carrying the main control chip through cables or gold fingers on the board, which facilitates the installation of core capacity functions and the maintenance of functional boards.

[0031] The above preferred embodiments should be regarded as examples of the implementation methods of the present application scheme. Any technical deductions, replacements, improvements, etc. that are identical or similar to the present application scheme or made based on it should be regarded as within the scope of protection of this patent.

Claims

1. An integrated sampling circuit for a core capacitance device, comprising a main control chip for electrical parameter calculation, characterized in that: The main control chip is connected to a current sampling module and a voltage sampling module; The current sampling module includes a first electrostatic protection circuit and a first operational amplifier circuit. The input end of the first electrostatic protection circuit is connected to the current sampling terminal, and the output end thereof is connected to the input end of the first operational amplifier circuit. The output end of the first operational amplifier circuit is connected to the main control chip. The current sampling terminal is used to connect to an external Hall current sensor. The voltage sampling module includes a diode voltage drop sampling module and a battery pack voltage sampling module; The diode voltage drop sampling module includes a second electrostatic protection circuit and a second operational amplifier circuit, wherein the input end of the second electrostatic protection circuit is connected to the first voltage sampling terminal, and the output end thereof is connected to the input end of the second operational amplifier circuit, and the output end of the second operational amplifier circuit is connected to the main control chip; The battery pack voltage sampling module includes a first resistive voltage divider circuit, an input end of the first resistive voltage divider circuit is connected to the second voltage sampling terminal, and an output end of the first resistive voltage divider circuit is connected to the main control chip.

2. The integrated sampling circuit of the core capacitance device according to claim 1, characterized in that: The first operational amplifier circuit includes an operational amplifier U33A, an input resistor R106, an input resistor R108, an input capacitor C55, an input capacitor C59, an output resistor R104 and an output capacitor C56. One end of the input resistor R106 is connected to the current sampling terminal, and the other end is connected to the input resistor R108. The other end of the resistor R108 is grounded. The operational amplifier U33A adopts a negative feedback structure, and its non-phase input end is connected to the common end of the input resistor R106 and the input resistor R108. One end of the output resistor R104 is connected to the output end of the operational amplifier U33A, and the other end is connected to the output end of the first operational amplifier circuit. One end of the output capacitor C56 is connected to the output resistor R104, and the other end is grounded.

3. The integrated sampling circuit of the core capacitance device according to claim 2, characterized in that: The first electrostatic protection circuit includes a diode TVS12 and a diode TVS14. The current sampling terminal has a high-voltage pin connected to VCC and a low-voltage pin connected to the first operational amplifier circuit. One end of the diode TVS12 is connected to the high-voltage pin of the current sampling terminal, and the other end is grounded; one end of the diode TVS14 is connected to the low-voltage pin of the current sampling terminal, and the other end is grounded; the diode TVS12 and the diode TVS14 are both transient voltage suppression diodes.

4. The integrated sampling circuit of the core capacitance device according to claim 3, characterized in that: Capacitors C53 and C54 are connected in parallel at both ends of the diode TVS12.

5. The integrated sampling circuit of the core capacitance device according to claim 1, characterized in that: The second operational amplifier circuit includes an operational amplifier U34A, a resistor R109, a resistor R110, a resistor R111, a resistor R112 and a capacitor C60. The positive input terminal of the operational amplifier U34A is connected to one pin of the first voltage sampling terminal via the resistor R111, and the negative input terminal of the operational amplifier U34A is connected to the other pin of the first voltage sampling terminal via the resistor R110; a resistor R109 is connected between the output terminal and the negative input terminal of the operational amplifier U34A, the capacitor C60 is connected in parallel with the resistor R109, one end of the resistor R112 is connected to the positive input terminal of the operational amplifier U34A, and the other end is connected to the reference voltage.

6. The integrated sampling circuit of the core capacitance device according to claim 5, characterized in that: The second operational amplifier circuit also includes a reference voltage circuit for providing the reference voltage. The reference voltage circuit includes an operational amplifier U34D, a resistor R113, a resistor R115 and a capacitor C145. The resistor R113 and the resistor R115 are connected in series between VCC and ground, and their common end is connected to the positive input end of the operational amplifier U34D. The output end of the operational amplifier U34D is connected to its negative input end. One end of the capacitor C145 is connected to the output end of the operational amplifier U34D, and the other end is grounded.

7. The integrated sampling circuit of the core capacitance device according to claim 5, characterized in that: The second electrostatic protection circuit includes a diode ESD1 and a diode ESD2 , and the diode ESD1 and the diode ESD2 are grounded to two pins of the first voltage sampling terminal respectively.

8. The integrated sampling circuit of the core capacitance device according to claim 1, characterized in that: The first resistive voltage divider circuit includes a plurality of voltage divider resistors connected in series between the two pins of the second voltage sampling terminal, with the common end of the voltage divider resistors being used as the output end and a filter capacitor being connected to the output end; a varistor is also connected between the two pins of the second voltage sampling terminal.

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