High voltage detection and overvoltage alarm circuit

Abstract

The utility model relates to a high voltage detection and overvoltage alarm circuit, which comprises a sampling module, an integrating circuit module, an overvoltage signal output module and a high voltage detection module, the sampling module, the integrating circuit module and the overvoltage signal output module are sequentially connected in series to form a first circuit, and the sampling module and the high voltage detection module are connected in series to form a second circuit. The input end of the integrating circuit module is connected in parallel with the input end of the high-voltage detection module, the input of the sampling module is high-voltage bus voltage, the output of the first circuit is an overvoltage alarm signal, and the output of the second circuit is a high-voltage detection signal. Compared with the prior art, the system has the advantages of simultaneous detection and alarm functions, high practicability and the like.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicles, and in particular to a high-voltage detection and overvoltage alarm circuit. Background Art

[0002] The design and manufacture of electronic control systems is a crucial component of the research, development, and manufacturing of new energy vehicles. These systems incorporate a variety of control circuits, among which high-voltage detection circuits are essential, ensuring the safety and reliability of the control system. The components in these circuits must meet the requirements for stable operation and safety in high-voltage environments, resulting in specialized design and manufacturing requirements. This inherent complexity and high cost are the hallmarks of these circuits. Two classic methods for high-voltage detection in new energy vehicles exist: the use of optical isolation chips for high-voltage detection, which is costly, and the use of differential amplifier circuits for high-voltage sampling, which eliminates isolation and increases circuit risk. While both circuits can sample high-voltage circuits, neither possesses a high-voltage alarm function. Utility Model Content

[0003] The purpose of the present invention is to provide a high voltage detection and overvoltage alarm circuit in order to overcome the defects of the prior art.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A high-voltage detection and overvoltage alarm circuit includes a sampling module, an integration circuit module, an overvoltage signal output module and a high-voltage detection module. The sampling module, the integration circuit module and the overvoltage signal output module are connected in series in sequence to form a first circuit. The sampling module and the high-voltage detection module are connected in series to form a second circuit. The input end of the integration circuit module and the input end of the high-voltage detection module are connected in parallel. The input of the sampling module is a high-voltage bus voltage. The output of the first circuit is an overvoltage alarm signal. The output of the second circuit is a high-voltage detection signal.

[0006] Furthermore, the sampling module includes a first input terminal, a first resistor, a second resistor, a driving isolation chip and a first output terminal. The driving isolation chip includes a voltage divider input terminal, a high-voltage bus negative input terminal and a digital signal output terminal. The first input terminal, the first resistor and the second resistor are connected in series in sequence. The two sides of the second resistor are respectively connected to the input terminal of the driving isolation chip. The voltage divider input terminal is connected between the first resistor and the second resistor. The negative input terminal of the high-voltage bus is connected to the side of the second resistor away from the first resistor. The driving isolation chip generates a digital signal according to the voltage divider input terminal and the high-voltage bus negative input terminal. The digital signal is output to the integration circuit module and the high-voltage detection module through the digital signal output terminal.

[0007] Furthermore, the integration circuit module includes a second input terminal, a third resistor, a fourth resistor, a fifth resistor, a capacitor, a first operational amplifier and a second output terminal. The second input terminal and the fourth resistor are connected in series and connected to the inverting input terminal of the first operational amplifier. One end of the fifth resistor is grounded, and the other end is connected to the non-inverting input terminal of the first operational amplifier. After the third resistor and the capacitor are connected in parallel, one end is connected between the fourth resistor and the inverting input terminal of the first operational amplifier, and the other end is connected to the output terminal of the first operational amplifier.

[0008] Furthermore, the overvoltage signal output module includes at least one of a digital signal output circuit or an analog signal output circuit and a comparator module.

[0009] Furthermore, the comparator module includes a seventh resistor, an eighth resistor and a comparator, the output end of the integration circuit module, the seventh resistor and the inverting input end of the comparator are connected in series in sequence, one end of the eighth resistor is connected to the reference voltage, and the other end is connected to the non-inverting input end of the comparator, and the output end of the comparator is connected to the digital signal output circuit and / or the analog signal output circuit.

[0010] Furthermore, the digital signal output circuit includes a latch module, and an input end of the latch module is connected to an output end of the comparator module.

[0011] Furthermore, the analog signal output circuit includes a sixth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first transistor, a second transistor and a power supply, one end of the sixth resistor is connected to the output end of the comparator, and the other end is connected in parallel to the base of the second transistor, one end of the tenth resistor and one end of the eleventh resistor, the emitter of the second transistor and the other end of the eleventh resistor are connected to the ground in parallel, the tenth resistor is connected to the collector of the first transistor, the power supply is connected in parallel to the emitter of the first transistor and one end of the ninth resistor, and the output end of the analog signal output circuit is connected in parallel to the other end of the ninth resistor, the base of the first transistor and the collector of the second transistor.

[0012] Furthermore, the first transistor is a PNP transistor, and the second transistor is an NPN transistor.

[0013] Furthermore, when the overvoltage signal output module includes both a digital signal output circuit and an analog signal output circuit, the input end of the digital signal output circuit and the input end of the analog signal output circuit are connected in parallel to the output end of the comparator module.

[0014] Furthermore, the high-voltage detection module includes a data recording module, and the input of the data recording module includes the output of the acquisition module and a clock signal.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) The present invention uses a sampling module, an integration circuit module and an overvoltage signal output module to alarm for overvoltage phenomena of the high-voltage bus voltage and output an overvoltage alarm signal. At the same time, the sampling module and the high-voltage detection module are used to measure the high-voltage bus voltage, thereby realizing high-voltage detection and overvoltage alarm functions.

[0017] 2) The present invention designs two different overvoltage signal output modes: digital signal output and analog signal output. This provides a variety of output signal forms for the circuit, thereby providing more possibilities for further application of the circuit and having stronger practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the present utility model.

[0019] Explanation of the marks in the figure: 1. Sampling module, 2. Integrator circuit module, 31. Digital signal output circuit, 32. Analog signal output circuit, 33. Comparator module, 4. High-voltage detection module, R1. First resistor, R2. Second resistor, R3. Third resistor, R4. Fourth resistor, R5. Fifth resistor, R6. Sixth resistor, R7. Seventh resistor, R8. Eighth resistor, R9. Ninth resistor, R10. Tenth resistor, R11. Eleventh resistor, U1. Driver isolation chip, U2. First operational amplifier, U3. Comparator, U4. Latch module, U5. Data recording module, C. Capacitor, HVDC. High-voltage bus voltage, AIP. Voltage divider input terminal, VCC power supply, CLK. Clock signal, RST. Reset signal, OV1. Output terminal of digital signal output circuit, OV2. Output terminal of analog signal output circuit, V ref , reference voltage. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0021] Example 1

[0022] The utility model is a high voltage detection and overvoltage alarm circuit, such as Figure 1 As shown, it includes a sampling module, an integration circuit module, an overvoltage signal output module and a high-voltage detection module. The sampling module, the integration circuit module and the overvoltage signal output module are connected in series in sequence to form a first circuit, the sampling module and the high-voltage detection module are connected in series to form a second circuit, the input end of the integration circuit module and the input end of the high-voltage detection module are connected in parallel, the input of the sampling module is the high-voltage bus voltage, the output of the first circuit is an overvoltage alarm signal, and the output of the second circuit is a high-voltage detection signal.

[0023] The specific structure and working principle of the utility model are as follows:

[0024] Sampling module 1:

[0025] The sampling module includes a first input terminal, a first resistor R1, a second resistor R2, a drive isolation chip U1 and a first output terminal. The drive isolation chip U1 includes a voltage divider input terminal, a high-voltage bus negative input terminal and a digital signal output terminal. The first input terminal, the first resistor R1 and the second resistor R2 are connected in series in sequence. The two sides of the second resistor R2 are respectively connected to the input terminal of the drive isolation chip. The voltage divider input terminal is connected between the first resistor R1 and the second resistor R2. The negative input terminal of the high-voltage bus is connected to the side of the second resistor R2 away from the first resistor R1. The drive isolation chip U1 generates a digital signal according to the voltage divider input terminal and the high-voltage bus negative input terminal. The digital signal is output to the integration circuit module 2 and the high-voltage detection module 4 through the digital signal output terminal.

[0026] The high voltage bus voltage HVDC is divided by the first resistor R1 and the second resistor R2. According to Ohm's law, the resulting divided voltage V AIP , the divided voltage V AIP Input drive isolation chip U1. Due to the characteristics of analog signals drifting over time, difficult to adjust, high power consumption, and susceptible to noise and environmental interference, the isolation chip selected in this design can AIP The signal is converted into a pulse width debugging signal V with better noise immunity and controllability PWM .

[0027] Integrator circuit module 2:

[0028] The pulse width debugging signal V output by sampling module 1 PWM After being converted into a triangular wave signal by the integration circuit module 2, the amplitude of the converted triangular wave increases with the increase of the duty cycle. The triangular wave signal is the output signal V 2OUT .

[0029] The integration circuit module includes a second input terminal, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a capacitor C, a first operational amplifier U2 and a second output terminal. The second input terminal and the fourth resistor R4 are connected in series and connected to the inverting input terminal of the first operational amplifier U2. One end of the fifth resistor R5 is grounded, and the other end is connected to the non-inverting input terminal of the first operational amplifier U2. After the third resistor R3 and the capacitor C are connected in parallel, one end is connected between the fourth resistor R4 and the inverting input terminal of the first operational amplifier U2, and the other end is connected to the output terminal of the first operational amplifier U2.

[0030] Overvoltage signal output module:

[0031] In response to different application requirements, this example provides two output circuits of the overvoltage signal output module, namely a digital signal output circuit 31 and an analog signal output circuit 32 . The two output circuits share the same pre-circuit: a comparator module 33 .

[0032] The comparator module 33 includes a seventh resistor R7, an eighth resistor R8 and a comparator U3. The output end of the integration circuit module, the seventh resistor R7 and the inverting input end of the comparator U3 are connected in series in sequence. One end of the eighth resistor R8 is connected to the reference voltage, and the other end is connected to the non-inverting input end of the comparator U3. The output end of the comparator U3 is connected to the digital signal output circuit 31 and / or the analog signal output circuit 32.

[0033] Comparator U3 has a reference voltage V ref , when the amplitude of the triangle wave is less than V ref When , comparator U3 will output a high level.

[0034] The digital signal output circuit 31 includes a latch module U4 , an input end of the latch module is connected to the output end of the comparator module.

[0035] When the latch module U4 receives the changed voltage level, it records the change and outputs the overvoltage signal OV1. If there is no reset signal RST input, the overvoltage signal OV1 of the digital signal output circuit 31 will remain constant.

[0036] The analog signal output circuit 32 includes a sixth resistor R6, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first transistor Q1, a second transistor Q2, and a power supply VCC. One end of the sixth resistor R6 is connected to the output of the comparator, and the other end is connected in parallel to the base of the second transistor Q2, one end of the tenth resistor R10, and one end of the eleventh resistor R11. The emitter of the second transistor Q2 and the other end of the eleventh resistor R11 are connected in parallel to ground. The tenth resistor R10 is connected to the collector of the first transistor Q1. The power supply is connected in parallel to the emitter of the first transistor Q1 and one end of the ninth resistor R9. The output end of the analog signal output circuit is connected in parallel to the other end of the ninth resistor R9, the base of the first transistor Q1, and the collector of the second transistor Q2. The first transistor Q1 is a PNP transistor, and the second transistor Q2 is an NPN transistor.

[0037] In the initial state of the analog signal output circuit 32, the base of Q2 is at a low level, and Q2 is not conducting. Since Q2 is not conducting, the base of transistor Q1 is at a high level, and Q1 is also not conducting. At this time, the circuit output OV2 is at a high level. As HVDC increases, comparator U3 in the comparator module 33 outputs a rising edge signal. This rising edge level causes Q2 to turn on. Turning on Q2 lowers the base voltage of Q1, causing Q1 to turn on. Turning on Q1 in turn raises the base voltage of Q2. At this point, both Q1 and Q2 remain in the on state, and OV2 maintains a low output level, indicating the generation of overvoltage signal OV2 from the analog signal output circuit 32.

[0038] High voltage detection module 4:

[0039] The high voltage detection module 4 includes a data recording module U5, the input of which includes the output of the acquisition module, namely V PWM , and clock signal CLK.

[0040] Data recording module U5 through V PWM The rising and falling edges of the signal are used as the start or end signal of the data recording period, and the clock signal CLK within the data recording period is recorded as V PWM The duration of each stage of the signal outputs a high-voltage detection signal.

[0041] Researchers can use the high-voltage detection signal output by the utility model to perform specific calculations on the voltage value of the high-voltage bus.

[0042] This utility model provides a high-voltage detection and overvoltage alarm circuit for new energy vehicles based on driver chips. Compared to traditional high-voltage sampling circuits, this circuit integrates both high-voltage sampling and overvoltage alarm functions. The design uses an isolation chip with PWM signal output to effectively reduce circuit costs and ensure isolation between high- and low-voltage circuits. High-voltage signals are then detected through a high-voltage detection module. To ensure timely output of overvoltage signals, this design implements the high-voltage alarm function using an overvoltage signal output module. The overvoltage signal output module provides both analog and digital signal outputs, expanding the design's functional coverage.

[0043] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A high voltage detection and overvoltage alarm circuit, characterized in that: The invention comprises a sampling module (1), an integration circuit module (2), an overvoltage signal output module and a high-voltage detection module (4); the sampling module (1), the integration circuit module (2) and the overvoltage signal output module are sequentially connected in series to form a first circuit; the sampling module (1) and the high-voltage detection module (4) are connected in series to form a second circuit; the input end of the integration circuit module (2) and the input end of the high-voltage detection module (4) are connected in parallel; the input of the sampling module (1) is a high-voltage bus voltage; the output of the first circuit is an overvoltage alarm signal; and the output of the second circuit is a high-voltage detection signal.

2. A high voltage detection and overvoltage alarm circuit according to claim 1, characterized in that: The sampling module (1) comprises a first input terminal, a first resistor, a second resistor, a drive isolation chip and a first output terminal, wherein the drive isolation chip comprises a voltage divider input terminal, a high-voltage bus negative input terminal and a digital signal output terminal, wherein the first input terminal, the first resistor and the second resistor are sequentially connected in series, and both sides of the second resistor are respectively connected to the input terminal of the drive isolation chip, the voltage divider input terminal is connected between the first resistor and the second resistor, and the high-voltage bus negative input terminal is connected to a side of the second resistor away from the first resistor, and the drive isolation chip generates a digital signal according to the voltage divider input terminal and the high-voltage bus negative input terminal, and the digital signal is output to the integration circuit module (2) and the high-voltage detection module (4) through the digital signal output terminal.

3. A high voltage detection and overvoltage alarm circuit according to claim 1, characterized in that: The integration circuit module (2) comprises a second input terminal, a third resistor, a fourth resistor, a fifth resistor, a capacitor, a first operational amplifier, and a second output terminal. The second input terminal and the fourth resistor are connected in series and connected to the inverting input terminal of the first operational amplifier. One end of the fifth resistor is grounded, and the other end is connected to the non-inverting input terminal of the first operational amplifier. After the third resistor and the capacitor are connected in parallel, one end is connected between the fourth resistor and the inverting input terminal of the first operational amplifier, and the other end is connected to the output terminal of the first operational amplifier.

4. A high voltage detection and overvoltage alarm circuit according to claim 1, characterized in that: The overvoltage signal output module comprises at least one of a digital signal output circuit (31) or an analog signal output circuit (32) and a comparator module (33).

5. A high voltage detection and overvoltage alarm circuit according to claim 4, characterized in that: The comparator module (33) comprises a seventh resistor, an eighth resistor and a comparator, the output end of the integration circuit module (2), the seventh resistor and the inverting input end of the comparator are sequentially connected in series, one end of the eighth resistor is connected to a reference voltage, and the other end is connected to the non-inverting input end of the comparator, and the output end of the comparator is connected to a digital signal output circuit (31) and / or an analog signal output circuit (32).

6. A high voltage detection and overvoltage alarm circuit according to claim 4, characterized in that: The digital signal output circuit (31) comprises a latch module, an input end of the latch module being connected to an output end of the comparator module (33).

7. A high voltage detection and overvoltage alarm circuit according to claim 4, characterized in that: The analog signal output circuit (32) comprises a sixth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first transistor, a second transistor and a power supply, one end of the sixth resistor is connected to the output end of the comparator, and the other end is connected in parallel to the base of the second transistor, one end of the tenth resistor and one end of the eleventh resistor, the emitter of the second transistor and the other end of the eleventh resistor are connected in parallel to the ground, the tenth resistor is connected to the collector of the first transistor, the power supply is connected in parallel to the emitter of the first transistor and one end of the ninth resistor, and the output end of the analog signal output circuit (32) is connected in parallel to the other end of the ninth resistor, the base of the first transistor and the collector of the second transistor.

8. A high voltage detection and overvoltage alarm circuit according to claim 7, characterized in that: The first transistor is a PNP transistor, and the second transistor is an NPN transistor.

9. A high voltage detection and overvoltage alarm circuit according to claim 4, characterized in that: When the overvoltage signal output module includes both a digital signal output circuit (31) and an analog signal output circuit (32), the input end of the digital signal output circuit (31) and the input end of the analog signal output circuit (32) are connected in parallel to the output end of the comparator module (33).

10. The high voltage detection and overvoltage alarm circuit according to claim 1, characterized in that: The high-voltage detection module (4) comprises a data recording module, and the input of the data recording module comprises the output of the acquisition module and a clock signal.

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