High-voltage-resistant DIDO circuit based on network transformer

Abstract

The utility model discloses a high-voltage-withstanding DIDO circuit based on a network transformer. The high-voltage-withstanding DIDO circuit comprises a peripheral circuit of an AFE chip, a power conversion module, a DI input signal detection module and a DO output signal detection module. The power conversion module reduces and converts 24V voltage into 5V voltage, and supplies 5V voltage to the DI input signal detection module; the DI input signal detection module identifies a DI input signal and inputs the DI input signal into the AFE chip; and the DO output signal detection module identifies the signal transmitted by the AFE chip to realize DO output. According to the utility model, the GPIO of the AFE chip is matched with some simple peripheral circuits, so that all functions of the mainstream scheme in the background technology can be realized, and in addition, the circuit also has the advantages of sufficient safety spacing, low hardware cost, simple circuit, simple control logic and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy, electric automobile, BMS energy storage system DIDO isolation technical field, concretely relates to a high voltage resistance DIDO circuit based on network transformer. BACKGROUND

[0002] At present, the board card (BMU) of the battery module level of the BMS energy storage system not only needs to have the battery voltage sampling function, but also needs to have the digital input (DI) and digital output (DO) functions under most working conditions. In order to ensure sufficient voltage resistance (safety distance), the current mainstream design scheme has to additionally increase the MCU chip and the related peripheral circuit on the low-voltage side of the BMU board, the battery voltage sampling is carried out on the battery side by using the AFE chip, the DI / DO function is realized through the MCU and the peripheral circuit on the low-voltage side, and the AFE chip and the MCU communicate through the wide-spacing network transformer. Although this mainstream scheme separates the high-voltage side sampling and the low-voltage side control communication, sufficient safety distance is met on the high-voltage side and the low-voltage side, but the increase of the MCU and the peripheral circuit increases the workload of software engineers and also increases the hardware cost. CONTENT OF THE UTILITY MODEL

[0003] The utility model is proposed to overcome the shortcomings in the prior art, and aims to provide a high voltage resistance DIDO circuit based on a network transformer.

[0004] The utility model is implemented by the following technical scheme:

[0005] A high voltage resistance DIDO circuit based on a network transformer, comprising a peripheral circuit of an AFE chip, a power conversion module, a DI input signal detection module and a DO output signal detection module; the power conversion module converts 24V voltage into 5V voltage and supplies the 5V voltage to the DI input signal detection module; the DI input signal detection module identifies the DI input signal and inputs the DI input signal into the AFE chip; the DO output signal detection module identifies the signal transmitted by the AFE chip and realizes DO output.

[0006] In the above technical scheme, the power conversion module comprises a power conversion chip, 24V voltage is input to the 7-pin of the power conversion chip through a filter capacitor group, the 1-pin of the power conversion chip outputs 5V to the outside through a filter branch, 5V is connected to 24VGND after being divided by a resistor group, and the 6-pin and the 9-pin of the power conversion chip are connected to 24VGND.

[0007] In the above technical scheme, the filter capacitor group is composed of the parallelly connected capacitor C3 and capacitor C4.

[0008] In the above technical scheme, the filter branch comprises the capacitor C1, the inductor L1 and the capacitor C4 connected in sequence.

[0009] In the technical scheme, the voltage dividing resistor group is composed of resistors R1 and R2 connected in series, and the midpoint of the resistors R1 and R2 is connected to the 4th pin of the power conversion chip.

[0010] In the technical scheme, the DI input signal detection module comprises a DI transformer drive chip and a DI network transformer; the DI signal is input to the 1st pin of the DI transformer drive chip after voltage dividing by resistors and filtering by capacitors; 5V output by the power conversion module is input to the 5th pin of the DI transformer drive chip after filtering by capacitors; the 6th pin of the DI transformer drive chip is connected to the 1st pin of the DI network transformer; the 5th pin of the DI transformer drive chip is connected to the 3rd and 4th pins of the DI network transformer; the 6th pin of the DI network transformer is connected to the 4th pin of the DI transformer drive chip; the anode of a diode D2 is connected to the 12th pin of the DI network transformer, and the anode of a diode D3 is connected to the 7th pin of the DI network transformer; the 9th and 10th pins of the DI network transformer are both connected to BAT-; the cathodes of the diodes D2 and D3 are connected together, and then filtered by a capacitor C11, and then input to the GPIO9 of the AFE chip through a resistor R7 after a pull-down resistor R8.

[0011] In the technical scheme, the resistor voltage dividing and capacitor filtering circuit of the DI signal is connected as follows: the DI signal is input to the 1st pin of the DI transformer drive chip after passing through a resistor R13, a pull-down resistor R9 and filtering by a capacitor C12.

[0012] In the technical scheme, the DO output signal detection module comprises a DO transformer drive chip and a DO network transformer, and the DO_OUT signal is input to the 1st pin of the DO transformer drive chip after passing through a resistor voltage dividing and capacitor filtering circuit; 5V is input to the 5th pin of the DO transformer drive chip after filtering by a capacitor; the 6th pin of the DO transformer drive chip is connected to the 1st pin of the DO network transformer; the 5th pin of the DO transformer drive chip is connected to the 3rd and 4th pins of the DO network transformer; the 6th pin of the DO network transformer is connected to the 4th pin of the DO transformer drive chip; the anode of a diode D4 is connected to the 12th pin of the DO network transformer; the anode of a diode D5 is connected to the 7th pin of the DO network transformer; the cathodes of the diodes D4 and D5 are connected together, and then filtered by a capacitor C14, and then output the DO signal after passing through a pull-down resistor R12 and a resistor R10.

[0013] In the technical scheme, the resistor voltage dividing and capacitor filtering circuit of the DO_OUT signal is connected as follows: the DO_OUT signal is input to the 1st pin of the DO transformer drive chip after passing through a pull-down resistor R18 and a resistor R14 and filtering by a capacitor C16.

[0014] The beneficial effects of the utility model are as follows:

[0015] This utility model provides a high-voltage DIDO circuit based on a network transformer. This circuit fully utilizes the GPIO pin functionality of the AFE. Combining a wide-pitch network transformer with a simple driver circuit achieves the same performance as mainstream solutions. By optimizing the MCU chip and its peripheral circuitry, this simplifies the circuit, reduces hardware costs, and reduces the workload for software engineers. Furthermore, due to the reduced number of components used, the hardware circuit is simpler, more reliable, and easier to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Fig. 1 It is a system block diagram of the utility model;

[0017] Fig. 2 This is a circuit diagram of the power switching module in the utility model;

[0018] Fig. 3 This is the circuit diagram of the DI input signal detection module in the utility model;

[0019] Fig. 4 This is the circuit diagram of the DO output signal detection module in the utility model;

[0020] Fig. 5 It is a circuit diagram of the AFE chip in the utility model.

[0021] in:

[0022] 1. Power conversion module; 11. Power conversion chip; 2. DI input signal detection module; 21. DI transformer driver chip; 22. DI network transformer; 3. DO output signal detection module; 31. DO transformer driver chip; 32. DO network transformer; 4. AFE chip.

[0023] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0025] like Figs. 1-5 As shown, a high-voltage DIDO circuit based on a network transformer includes a peripheral circuit of an AFE chip 4, a power conversion module 1, a DI input signal detection module 2, and a DO output signal detection module 3;

[0026] The peripheral circuits of the AFE chip 4 are specifically as follows:

[0027] The positive pole BAT+ of the battery PACK is connected to pin 1 of the AFE chip 4 through a resistor R3 with resistance of 100R and precision of 1% and a capacitor C5 with capacitance of 0.01uF and voltage resistance of 100V;

[0028] The positive pole BAT+ of the battery PACK is connected to the collector of the triode Q1 through a resistor R4 with resistance of 100R and precision of 1% and a capacitor C8 with capacitance of 0.01uF and voltage resistance of 100V, and pin 49 of the AFE chip 4 is connected to the base of the triode Q1;

[0029] The emitter of the triode Q1 outputs VCC_5V to the AFE chip 4 (pin 48 of the AFE chip 4) through a capacitor C10 with capacitance of 2.2uF and voltage resistance of 50V;

[0030] Pin 59, 60 and 65 of the AFE chip 4 are connected to BAT-;

[0031] Pin 51 and 50 of the AFE chip 4 are respectively connected to BAT- through a capacitor C6 / C7 with capacitance of 1uF and voltage resistance of 50V;

[0032] Pin 56 and 55 of the AFE chip 4 are connected through a resistor R11 with resistance of 1M and precision of 1%;

[0033] Pin 57 and 58 of the AFE chip 4 are connected through a resistor R5 with resistance of 1.4K and precision of 1%, and pin 58 is connected to BAT- through a resistor R6 with resistance of 604R and precision of 1%;

[0034] Pin 53 and 54 of the AFE chip 4 are connected to BAT-.

[0035] The power conversion module 1 comprises a power conversion chip 11, and the specific circuit connection is as follows:

[0036] The 24V power supply is connected to pin 7 of the power conversion chip 11 through capacitors C3 and C4 with capacitance of 4.7uF and voltage resistance of 50V;

[0037] Pin 6 and 9 of the power conversion chip 11 are connected to 24VGND;

[0038] Pin 1 of the power conversion chip 11 is connected to pin 8 through a capacitor C1 with capacitance of 0.01uF and voltage resistance of 50V, connected to the cathode of diode D1, and then connected to 24VGND through a 22uH inductor L1 and a capacitor C2 with capacitance of 330uF and voltage resistance of 50V, and outputs voltage 5V to the outside;

[0039] 5V is connected to 24VGND through a resistor R1 with resistance of 10K and precision of 1% and a resistor R2 with resistance of 3.24K and precision of 1% in series connection;

[0040] 4-pin of power conversion chip 11, connecting the midpoint of resistor R1 and resistor R2.

[0041] The DI input signal detection module 2 includes DI transformer drive chip 21 and DI network transformer 22, and the specific circuit connection is:

[0042] The DI signal passes through a resistance of 4.7K and a precision of 1% resistor R13, a resistance of 100K and a precision of 1% pull-down resistor R9, and then a capacitance of 1UF and a voltage of 50V capacitor C12 filter input to the 1-pin of DI transformer drive chip 21;

[0043] 5V passes through a capacitance of 1uF and a voltage of 50V capacitor C13 filter input to the 5-pin of DI transformer drive chip 21;

[0044] The 2-pin of DI transformer drive chip 21 is connected to 24VGND;

[0045] The 6-pin of DI transformer drive chip 21 is connected to the 1-pin of DI network transformer 22;

[0046] The 5-pin of DI transformer drive chip 21 is connected to the 3-pin and 4-pin of DI network transformer 22;

[0047] The 6-pin of DI network transformer 22 is connected to the 4-pin of DI transformer drive chip 21;

[0048] The 12-pin of DI network transformer 22 is connected to the anode of diode D2, and the 7-pin of DI network transformer 22 is connected to the anode of diode D3;

[0049] The 9-pin and 10-pin of DI network transformer 22 are connected to BAT- at the same time;

[0050] The cathodes of diode D2 and diode D3 are connected together, and then filtered through a capacitance of 10uF and a voltage of 50V capacitor C11, and then input to the GPIO9 of AFE chip 4 through a resistance of 4.7K and a precision of 1% resistor R7 after a resistance of 100K and a precision of 1% pull-down resistor R8.

[0051] The DO output signal detection module 3 includes DO transformer drive chip 31 and DO network transformer 32, and the specific circuit connection is:

[0052] The DO_OUT signal passes through a resistance of 100K and a precision of 1% pull-down resistor R18, a resistance of 4.7K and a precision of 1% resistor R14, and then a capacitance of 1uF and a voltage of 50V capacitor C16 filter input to the 1-pin of DO transformer drive chip 31;

[0053] VCC_5V through the capacitance 1uF, withstand voltage 50V capacitor C15 filtered input to the 5 foot DO transformer drive chip 31;

[0054] The 2 foot DO transformer drive chip 31 connects BAT-;

[0055] The 6 foot DO transformer drive chip 31 connects the 1 foot of DO network transformer 32;

[0056] The 5 foot DO transformer drive chip 31 connects the 3 foot and 4 foot of DO network transformer 32;

[0057] The 6 foot DO network transformer 32 connects the 4 foot of DO transformer drive chip 31;

[0058] The 12 foot DO network transformer 32 connects the anode of diode D4;

[0059] The 7 foot DO network transformer 32 connects the anode of diode D5;

[0060] The 9 foot and 10 foot of DO network transformer 32 simultaneously connect 24VGND;

[0061] The cathode of diode D4 and diode D5 is connected together, then through a capacitance 10uF, withstand voltage 50V capacitor C14 filtering, after a resistance of 100K, accuracy of 1% pull-down resistor R12, through the resistance of 4.7K, accuracy of 1% resistor R10, the external output DO signal.

[0062] In the embodiment, the model of the AFE chip 4 is ADBMS1818ASWZ;The model of the triode 41 is FZT694BTA.

[0063] In the embodiment, the model of the power conversion chip 11 is TPS5430DDAR.

[0064] In the embodiment, the model of the DI transformer drive chip 21 and DO transformer drive chip 31 is VPS8504B;The model of the DI network transformer 22 and DO network transformer 32 is ST12E01E0.

[0065] In the embodiment, the model of the diode D1 is B340A;The model of the diode D2, D3, D4, D5 is US1M.

[0066] The use method of the utility model:

[0067] Take DI input 3.3V, DO output 5V as an example to illustrate:

[0068] In work, 24V voltage is filtered by capacitor C3, C4 and input to the 7 pin of power conversion chip U1, and is converted by power conversion chip U1, and the 1 pin of power conversion chip U1 is filtered by capacitor C1, inductance L1 and C2, and 5V is output to the outside. After being divided by resistor R1 and resistor R2, the voltage at the midpoint of resistor R1 and resistor R2 is 1.22V, and is fed back to the 4 pin of power conversion chip U1; 5V voltage supplies power to DI input signal detection module 2.

[0069] The battery voltage BAT+ is filtered by resistor R4 and capacitor C8, and is input to the collector of triode Q1. The base of triode Q1 is driven by the 49 pin of AFE chip, and 5V voltage is output at the emitter of triode Q1. After being filtered by capacitor C10 and C9, VCC_5V supplies power to AFE chip 4 and DO output signal detection module 3.

[0070] DI input:

[0071] When there is no DI input, due to the pull-down of resistor R9, the 1 pin of DI transformer drive chip U3 is low, at this time DI transformer drive chip U3 does not work, and the 47 pin of AFE chip is also low at this time.

[0072] When there is DI signal input, after being divided by resistor R13 and resistor R9, the voltage on resistor R9 is 3.15V, which is input to the 1 pin of DI transformer drive chip U3. DI transformer drive chip U3 recognizes high level and starts to work. The 4 pin and 6 pin of DI transformer drive chip U3 output high and low level alternately, and form alternating voltage between the 1 pin and 3 pin, and between the 4 pin and 6 pin of DI network transformer. The alternating voltage is coupled to the secondary side through the transformer, and is output as stable 5V through the full-wave rectifier circuit (D2 / D3 / T1) formed by diode D2 and D3 and capacitor C11. After being limited by R7, 5V is output to the outside, and the 47 pin of AFE chip 4 recognizes high level, and DI input is completed.

[0073] DO output:

[0074] When AFE chip 4 does not output, the 46 pin of AFE chip 4 is low, at this time due to the pull-down of resistor R18, the 1 pin of DO transformer drive chip U4 is low, at this time DO transformer drive chip U4 does not work, and there is no DO output.

[0075] When the AFE chip 4 is outputting, the 46th pin of the AFE chip 4 is high level, outputting 3.3V. After voltage division by R14 and R18, the voltage on R18 is 3.15V input to the 1st pin of the DO transformer driving chip U4, and the DO transformer driving chip U4 recognizes high level to start working. The 4th pin and the 6th pin of the DO transformer driving chip U4 output high and low level alternately, forming alternating voltage between the 1st pin and the 3rd pin and between the 4th pin and the 6th pin of the DO network transformer T2, which is coupled to the secondary side through the transformer, and then output stable 5V through the full-wave rectifier circuit (D4 / D5 / T2) formed by diodes D4 and D5 and the capacitor C14, realizing DO output.

[0076] The applicant declares that the above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. It should be understood by those skilled in the art that any changes or replacements within the technical scope disclosed by the present application can be easily thought of by any person skilled in the art, and all of them fall within the protection scope and disclosure scope of the present application.

Claims

1. A high-voltage DIDO circuit based on a network transformer, characterized by: The invention comprises a peripheral circuit of an AFE chip (4), a power conversion module (1), a DI input signal detection module (2) and a DO output signal detection module (3); the power conversion module (1) steps down a 24V voltage into 5V and supplies the 5V voltage to the DI input signal detection module (2); the DI input signal detection module (2) identifies the DI input signal and inputs the DI input signal to the AFE chip (4); and the DO output signal detection module (3) identifies the signal transmitted by the AFE chip (4) to realize DO output.

2. The high-voltage DIDO circuit based on a network transformer according to claim 1, characterized in that: The power conversion module (1) comprises a power conversion chip (11), wherein a 24V voltage is input to pin 7 of the power conversion chip (11) via a filter capacitor group, and pin 1 of the power conversion chip (11) outputs 5V externally via a filter branch; the 5V is connected to 24VGND after passing through a voltage divider resistor group; Pins 6 and 9 of the power conversion chip (11) are connected to 24VGND.

3. The high-voltage DIDO circuit based on a network transformer according to claim 2, characterized in that: The filter capacitor group is composed of a capacitor C3 and a capacitor C4 connected in parallel.

4. The high-voltage DIDO circuit based on a network transformer according to claim 2, wherein: The filtering branch includes a capacitor C1, an inductor L1 and a capacitor C4 connected in sequence.

5. The high-voltage DIDO circuit based on a network transformer according to claim 2, wherein: The voltage-dividing resistor group is composed of resistors R1 and R2 connected in series, and the midpoint of the resistors R1 and R2 is connected to pin 4 of the power conversion chip (11).

6. The high-voltage DIDO circuit based on a network transformer according to claim 1, wherein: The DI input signal detection module (2) comprises a DI transformer driver chip (21) and a DI network transformer (22); the DI signal is input to pin 1 of the DI transformer driver chip (21) after being divided by resistors and filtered by capacitors; the 5V output by the power conversion module (1) is input to pin 5 of the DI transformer driver chip (21) after being filtered by capacitors; Pin 6 of the DI transformer driver chip (21) is connected to pin 1 of the DI network transformer (22); Pin 5 of the DI transformer driver chip (21) is connected to pins 3 and 4 of the DI network transformer (22); pin 6 of the DI network transformer (22) is connected to pin 4 of the DI transformer driver chip (21); pin 12 of the DI network transformer (22) is connected to the anode of the diode D2, and pin 7 of the DI network transformer (22) is connected to the anode of the diode D3; pins 9 and 10 of the DI network transformer (22) are simultaneously connected to BAT-; the cathodes of the diodes D2 and D3 are connected together, and then filtered through a capacitor C11, and after passing through a pull-down resistor R8, input to GPIO9 of the AFE chip (4) through a resistor R7.

7. The high-voltage DIDO circuit based on a network transformer according to claim 6, characterized in that: The resistor voltage divider and capacitor filtering circuit of the DI signal is specifically connected as follows: the DI signal passes through the resistor R13, the pull-down resistor R9, and then filtered by the capacitor C12 before being input to pin 1 of the DI transformer driver chip (21).

8. The high-voltage DIDO circuit based on a network transformer according to claim 1, wherein: The DO output signal detection module (3) includes a DO transformer driver chip (31) and a DO network transformer (32); the DO_OUT signal is input to pin 1 of the DO transformer driver chip (31) after passing through a resistor voltage divider and a capacitor filtering circuit; and the VCC_5V signal is input to pin 5 of the DO transformer driver chip (31) after passing through a capacitor filtering circuit. Pin 6 of the DO transformer driver chip (31) is connected to pin 1 of the DO network transformer (32); pin 5 of the DO transformer driver chip (31) is connected to pins 3 and 4 of the DO network transformer (32); pin 6 of the DO network transformer (32) is connected to pin 4 of the DO transformer driver chip (31); pin 12 of the DO network transformer (32) is connected to the anode of the diode D4; pin 7 of the DO network transformer (32) is connected to the anode of the diode D5; the cathodes of the diode D4 and the diode D5 are connected together, and then filtered by the capacitor C14, and then passed through the pull-down resistor R12 and the resistor R10 to output the DO signal to the outside.

9. The high-voltage DIDO circuit based on a network transformer according to claim 8, characterized in that: The resistor voltage divider and capacitor filtering circuit of the DO_OUT signal is specifically connected as follows: the DO_OUT signal passes through the pull-down resistor R18 and the resistor R14, and then is filtered by the capacitor C16 before being input to the 1st pin of the DO transformer driver chip (31).

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