A high-voltage isolation area temperature acquisition device

Abstract

The application discloses a high-voltage isolation area temperature acquisition device, and belongs to the technical field of temperature acquisition. The temperature acquisition device comprises an isolation module, a correction module and an optical coupling module. The isolation module is connected with the correction module, and the optical coupling module is connected with the correction module and the isolation module. The isolation module is used for collecting and isolating temperature signals acquired by a temperature sensor. The correction module is used for correcting the temperature signals output by the isolation module. The optical coupling module is used for receiving and transmitting signals fed back by the isolation module and the correction module.

Description

Technical Field

[0001] This invention relates to the field of temperature acquisition technology for isolation zones, and particularly to a temperature acquisition device for high-voltage isolation zones. Background Technology

[0002] CN117589323A discloses a high-voltage isolation zone temperature acquisition circuit. This circuit converts an electrical signal that changes with temperature into a PWM signal whose duty cycle changes accordingly with the change of electrical signal by setting a triangular wave generation module, and then feeds it back to the main control chip at the temperature signal demand end. The main control chip obtains the actual temperature of the heating point in the isolation zone by detecting and calculating the signal duty cycle. However, this circuit cannot automatically correct the temperature signal while isolating and outputting it, and cannot improve the compatibility of the demand-end chip while preventing deviations and erroneous temperature signal feedback during the correction process. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this invention is to provide a high-voltage isolation zone temperature acquisition device. The temperature acquisition device includes an isolation module, a calibration module, and an optocoupler module. The isolation module and the calibration module are connected, and the optocoupler module is connected to both the calibration module and the isolation module. The isolation module is used to acquire and isolate the temperature signal obtained by the temperature sensor. The calibration module is used to calibrate the temperature signal output by the isolation module. The optocoupler module is used to receive and transmit the signals fed back by the isolation module and the calibration module.

[0004] Furthermore, the isolation module includes an adjustment unit, an isolation unit, and a feedback unit. The adjustment unit and the isolation unit are connected, and the isolation unit and the feedback unit are connected. The adjustment unit adjusts the power supply voltage of the isolation unit based on the adjustment signal fed back by the calibration module through the optocoupler module. The isolation unit is used to collect and isolate temperature signals, and the feedback unit is used to feed back the isolated temperature signal to the demand-side chip. The isolation unit includes resistors R1, R2, R3, and R26, operational amplifiers U1 and U2, coupling modules U3, U4, and U5, capacitor C1, and connector P1. The non-inverting input of operational amplifier U1 is connected to connector P1, the inverting input is connected to one end of resistor R1, and the output is connected to the other end of resistor R1 and the non-inverting input of operational amplifier U2. The inverting input of operational amplifier U2 is connected to one end of resistor R3, one end of capacitor C1, and the third pin of coupling module U3, and the output is connected to the other end of capacitor C1 and one end of resistor R26. The first pin of coupling module U3 is connected to the other end of resistor R26, the fourth pin is connected to one end of resistor R2, and the second pin is connected to the first pin of coupling module U4. The second pin of coupling module U4 is connected to the first pin of coupling module U5. The other end of resistor R2 is connected to the power supply. The other end of resistor R3 and the second pin of coupling module U5 are connected to the ground terminal.

[0005] Furthermore, the feedback unit includes resistors R4, R5, R6, and R7, operational amplifier U6, field-effect transistor Q2, connector P2, connector P3, and connector P4. One end of resistor R4 is connected to the fourth pin of coupling module U5, and the other end is connected to the power supply; the non-inverting input of operational amplifier U6 is connected to the third pin of coupling module U5 and one end of resistor R5, the inverting input is connected to one end of resistor R6, and the output is connected to the drain of field-effect transistor Q2 and connector P3; the gate of field-effect transistor Q2 is connected to connector P4, and the source is connected to one end of resistor R7 and connector P2; the other ends of resistor R5 and resistor R7 are connected to the ground terminal.

[0006] Furthermore, the calibration module includes resistors R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, and operational amplifiers U7, U8, and U9. One end of resistor R8 and one end of resistor R13 are connected to the power supply, and the other end is connected to the fourth pin of coupling module U4; the non-inverting input of operational amplifier U7 is connected to the third pin of coupling module U4 and one end of resistor R9, the inverting input is connected to one end of resistor R10, and the output is connected to the other end of resistor R10, one end of resistor R11, and one end of resistor R17; the non-inverting input of operational amplifier U8 is connected to the other end of resistor R11 and one end of resistor R12, and the inverting input is connected to one end of resistor R15 and one end of resistor R16. Connect the output terminal to the other end of resistor R16; connect the non-inverting input of op-amp U9 to the other end of resistor R17 and one end of resistor R18, connect the inverting input to one end of resistor R19 and one end of resistor R20, and connect the output terminal to the other end of resistor R19; connect the other end of resistor R13 to one end of resistor R14, the other end of resistor R15, and the other end of resistor R18; connect the other ends of resistor R9, resistor R12, resistor R14, and resistor R20 to the ground terminal.

[0007] Furthermore, the correction module also includes operational amplifier U10, operational amplifier U11, diode D1, diode D2, connector P5, connector P6, connector P7, and resistor R24; The non-inverting input of operational amplifier U10 is connected to the output of operational amplifier U8, the inverting input is connected to the non-inverting input of operational amplifier U11 and connector P5, and the output is connected to the anode of diode D1 and connector P6; the inverting input of operational amplifier U11 is connected to the output of operational amplifier U9, and the output is connected to the anode of diode D2 and connector P7; one end of resistor R24 ​​is connected to the cathodes of diodes D1 and D2, and the other end is connected to the ground terminal.

[0008] Furthermore, the calibration module also includes resistors R21, R22, and R23, transistor Q1, and connector P8; One end of resistor R21 is connected to the power supply, and the other end is connected to one end of resistor R22 and the emitter of transistor Q1; the base of transistor Q1 is connected to the cathode of diode D1, and the collector is connected to one end of resistor R23 and connector P8; the other ends of resistor R22 and resistor R23 are connected to the ground terminal.

[0009] Furthermore, the resistor R14 can be an adjustable resistor.

[0010] Furthermore, the feedback unit also includes a resistor R25; One end of the resistor R25 is connected to the gate of the field-effect transistor Q2, and the other end is connected to the ground terminal.

[0011] The advantages of this invention compared to the prior art are: This invention can isolate the output temperature signal while automatically correcting the signal, improving the compatibility of the demand-side chip and preventing deviations and erroneous temperature signal feedback during the correction process. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 This is a schematic diagram of the circuit connection structure of the isolation unit, feedback unit, and correction module provided by the present invention. Detailed Implementation

[0015] To make the objectives and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection specifically claimed by the present invention.

[0016] This invention discloses a high-voltage isolation zone temperature acquisition device, which includes an isolation module, a calibration module, and an optocoupler module. The isolation module and the calibration module are connected, and the optocoupler module is connected to both the calibration module and the isolation module. The isolation module is used to acquire and isolate the temperature signal obtained by the temperature sensor. The calibration module is used to calibrate the temperature signal output by the isolation module. The optocoupler module is used to receive and transmit the signals fed back by the isolation module and the calibration module.

[0017] Specifically, the isolation module includes an adjustment unit, an isolation unit, and a feedback unit. The adjustment unit and the isolation unit are connected, and the isolation unit and the feedback unit are connected. The adjustment unit adjusts the power supply voltage of the isolation unit based on the adjustment signal fed back by the calibration module through the optocoupler module. The isolation unit is used to collect and isolate temperature signals. The feedback unit is used to feed back the isolated temperature signal to the demand-side chip. The isolation unit includes resistors R1, R2, R3, and R26, operational amplifiers U1 and U2, coupling modules U3, U4, and U5, capacitor C1, and connector P1. The non-inverting input of operational amplifier U1 is connected to connector P1, the inverting input is connected to one end of resistor R1, and the output is connected to the other end of resistor R1 and the non-inverting input of operational amplifier U2. The inverting input of operational amplifier U2 is connected to one end of resistor R3, one end of capacitor C1, and the third pin of coupling module U3, and the output is connected to the other end of capacitor C1 and one end of resistor R26. The first pin of coupling module U3 is connected to the other end of resistor R26, the fourth pin is connected to one end of resistor R2, and the second pin is connected to the first pin of coupling module U4. The second pin of coupling module U4 is connected to the first pin of coupling module U5. The other end of resistor R2 is connected to the power supply. The other end of resistor R3 and the second pin of coupling module U5 are connected to the ground terminal.

[0018] Specifically, the feedback unit includes resistors R4, R5, R6, and R7, operational amplifier U6, field-effect transistor Q2, connector P2, connector P3, and connector P4. One end of resistor R4 is connected to the fourth pin of coupling module U5, and the other end is connected to the power supply; the non-inverting input of operational amplifier U6 is connected to the third pin of coupling module U5 and one end of resistor R5, the inverting input is connected to one end of resistor R6, and the output is connected to the drain of field-effect transistor Q2 and connector P3; the gate of field-effect transistor Q2 is connected to connector P4, and the source is connected to one end of resistor R7 and connector P2; the other ends of resistor R5 and resistor R7 are connected to the ground terminal.

[0019] Specifically, the calibration module includes resistors R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, and operational amplifiers U7, U8, and U9. One end of resistor R8 and one end of resistor R13 are connected to the power supply, and the other end is connected to the fourth pin of coupling module U4; the non-inverting input of operational amplifier U7 is connected to the third pin of coupling module U4 and one end of resistor R9, the inverting input is connected to one end of resistor R10, and the output is connected to the other end of resistor R10, one end of resistor R11, and one end of resistor R17; the non-inverting input of operational amplifier U8 is connected to the other end of resistor R11 and one end of resistor R12, and the inverting input is connected to one end of resistor R15 and one end of resistor R16. Connect the output terminal to the other end of resistor R16; connect the non-inverting input of op-amp U9 to the other end of resistor R17 and one end of resistor R18, connect the inverting input to one end of resistor R19 and one end of resistor R20, and connect the output terminal to the other end of resistor R19; connect the other end of resistor R13 to one end of resistor R14, the other end of resistor R15, and the other end of resistor R18; connect the other ends of resistor R9, resistor R12, resistor R14, and resistor R20 to the ground terminal.

[0020] Specifically, the correction module also includes operational amplifier U10, operational amplifier U11, diode D1, diode D2, connector P5, connector P6, connector P7, and resistor R24; The non-inverting input of operational amplifier U10 is connected to the output of operational amplifier U8, the inverting input is connected to the non-inverting input of operational amplifier U11 and connector P5, and the output is connected to the anode of diode D1 and connector P6; the inverting input of operational amplifier U11 is connected to the output of operational amplifier U9, and the output is connected to the anode of diode D2 and connector P7; one end of resistor R24 ​​is connected to the cathodes of diodes D1 and D2, and the other end is connected to the ground terminal.

[0021] Specifically, the calibration module also includes resistors R21, R22, and R23, transistor Q1, and connector P8; One end of resistor R21 is connected to the power supply, and the other end is connected to one end of resistor R22 and the emitter of transistor Q1; the base of transistor Q1 is connected to the cathode of diode D1, and the collector is connected to one end of resistor R23 and connector P8; the other ends of resistor R22 and resistor R23 are connected to the ground terminal.

[0022] Specifically, the resistor R14 can be an adjustable resistor.

[0023] Specifically, the feedback unit also includes a resistor R25; One end of the resistor R25 is connected to the gate of the field-effect transistor Q2, and the other end is connected to the ground terminal.

[0024] The power signal for the isolation unit is provided by the regulating unit. The temperature signal collected by the temperature sensor is fed back to the isolation unit connector P1. The output terminal of operational amplifier U1, the inverting terminal of operational amplifier U1, and the two ends of resistor R1 form a negative feedback connection to prevent signal interference from downstream circuits. The non-inverting terminal of operational amplifier U2 receives the signal feedback from the output terminal of operational amplifier U1, and then outputs the signal. The signal from the output terminal of operational amplifier U1 passes through resistor R26, the first pin of coupling module U3, the second pin of coupling module U3, the first pin of coupling module U4, the second pin of coupling module U4, the first pin of coupling module U5, and the second pin of coupling module U5. When the signal reaches the ground terminal, the potential of capacitor C1 rises, and coupling modules U3, U4, and U5 are coupled. The V1 signal passes through resistor R2, the fourth pin of coupling module U3, the third pin of coupling module U3, and resistor R3 to the ground terminal. The signal at the resistor R3 terminal is fed back to the inverting input of operational amplifier U2 to form a feedback loop. Operational amplifier U2 adjusts the output signal to make the signals at the non-inverting and inverting inputs of operational amplifier U2 consistent. In this way, when the isolation unit obtains a temperature signal, it can adjust the current of the photodiodes in coupling modules U3, U4, and U5 while isolating the output temperature signal.

[0025] The feedback unit signal is provided by the power supply of the chip at the temperature signal acquisition end outside the isolation zone. When the coupling module U5 is coupled, the V2 power signal passes through resistor R4, the fourth pin of the coupling module U5, the third pin of the coupling module U5, and resistor R5 to the ground terminal. The signal at the resistor R5 terminal is fed back to the non-inverting input of the operational amplifier U7. The output terminal of the operational amplifier U7 is negatively fed back through resistor R6 and the inverting input of the operational amplifier U7. The operational amplifier U6 follows the output of the isolated temperature signal. The signal at the output terminal of the operational amplifier U6 passes through the drain of the field-effect transistor Q2, the source of the field-effect transistor Q2, and resistor R7 to the ground terminal. The signal at the resistor R7 terminal is fed back to the chip that requires the temperature signal through connector P2.

[0026] Considering the different types of chips and their varying supply voltages, a discrepancy between the supply voltage of the isolation unit and the chip's supply voltage can lead to deviations in the acquired temperature signal. Excessive voltage difference between the supply voltages of the chip and the isolation unit can even result in the loss of temperature signal feedback with excessively high amplitude. Therefore, correction is necessary when the isolation unit provides the isolated temperature signal. The correction unit's supply voltage is consistent with the initial supply voltage of the isolation unit. During coupling with the coupling module U4, the V3 power signal passes through resistor R8, the fourth and third pins of the coupling module U4, and resistor R9 to ground. The signal at resistor R9 is fed back to the non-inverting input of operational amplifier U7. The output of operational amplifier U7 is negatively fed back through resistor R10 and the inverting input of operational amplifier U7, allowing operational amplifier U7 to output the isolated temperature signal. The output signal of operational amplifier U7 serves as the reference signal. The output signal of operational amplifier U7 passes through resistors R11 and R12 to ground. The signal at resistor R12 is fed back to the non-inverting input of operational amplifier U8. The V3 power signal passes through resistors R13 and R14 to ground, and the signal at resistor R14 is used for calibration accuracy. The reference signal's calibration accuracy can be adjusted by changing the value of resistor R14. A higher amplitude at resistor R14 results in lower calibration accuracy, and vice versa. The signal at resistor R14 is fed back to the inverting input of operational amplifier U8 via resistor R15. Operational amplifier U8 is connected to its inverting input via resistor R16 and negative feedback. The output signal of operational amplifier U8 represents the lower threshold of the calibration accuracy range between the reference signal and the reference signal. The signal at resistor R14 is fed back to the non-inverting input of operational amplifier U9 via resistor R18. The output signal of operational amplifier U7 is also fed back to the non-inverting input of operational amplifier U9. The output signal is connected to ground via resistors R19 and R20. The signal at resistor R20 is fed back to the inverting input of operational amplifier U9, forming a feedback loop. Operational amplifier U9 outputs a signal that serves as a reference signal and the upper limit threshold of the calibration accuracy range. This is used to form a calibration accuracy range based on the reference signal when the isolation unit feeds back the isolated temperature signal, facilitating the operation of subsequent circuits. This allows for automatic calibration of the isolated temperature signal while improving the compatibility of the acquisition circuit with the demand-side chips.

[0027] To prevent the feedback unit within the isolation module from continuing to feed temperature signals back to the demand-side chip during automatic calibration, which could cause the chip to issue erroneous commands based on the biased or incorrect temperature signals, the output signal of operational amplifier U8 is fed back to the non-inverting input of operational amplifier U10, and the output signal of operational amplifier U9 is fed back to the inverting input of operational amplifier U11. The signal from connector P5 on the inverting input of operational amplifier U10 and the non-inverting input of operational amplifier U11 is then obtained through an optocoupler module from the signal at connector P3 of the feedback unit. When the supply voltage of the isolation unit within the isolation module is lower than the supply voltage of the feedback unit, operational amplifier U10 outputs a signal. The signal from the output of operational amplifier U10 is then fed to the ground terminal via diode D1 and resistor R24. Simultaneously, operational amplifier U10 outputs... The terminal signal is fed back to the adjustment unit in the isolation module via connector P6 and optocoupler module. The adjustment unit gradually increases the power supply voltage of the isolation unit in the isolation module. When the power supply voltage of the isolation unit is higher than the power supply voltage of the feedback unit, the operational amplifier U11 outputs. The signal at the output terminal of operational amplifier U11 is fed back to the ground terminal via diode D2 and resistor R24. At the same time, the signal at the output terminal of operational amplifier U11 is fed back to the adjustment unit in the isolation module via connector P7 and optocoupler module. The adjustment unit gradually decreases the power supply voltage of the isolation unit. When the adjustment unit adjusts the power supply voltage of the isolation unit, transistor Q1 is cut off and field-effect transistor Q2 is cut off. At this time, there is no temperature signal feedback from the demand terminal chip.

[0028] The V3 power supply signal goes to ground via resistors R21 and R22. The signal at resistor R22 goes to ground via the emitter and base of transistor Q1 and resistor R24, turning on transistor Q1. The signal at resistor R22 goes to ground via the emitter and collector of transistor Q1 and resistor R23. The signal at resistor R23 goes to ground via connector P8 and the optocoupler module, feeding back to the adjustment unit and feedback unit connector P4 in the isolation module. Resistor R25 is used to discharge the parasitic capacitance of the gate of MOSFET Q2. When connector P4 receives a signal feedback, MOSFET Q2 turns on. When the adjustment unit receives a feedback signal from the optocoupler module, the adjustment unit stops adjusting the power supply voltage of the isolation unit. This ensures that the demand-side chip can normally obtain the isolated temperature signal after automatic calibration.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A temperature acquisition device for a high-voltage isolation zone, characterized in that, The temperature acquisition device includes an isolation module, a calibration module, and an optocoupler module. The isolation module and the calibration module are connected, and the optocoupler module is connected to both the calibration module and the isolation module. The isolation module is used to acquire and isolate the temperature signal obtained by the temperature sensor. The calibration module is used to calibrate the temperature signal output by the isolation module. The optocoupler module is used to receive and transmit the signals fed back by the isolation module and the calibration module. The isolation module includes an adjustment unit, an isolation unit, and a feedback unit. The adjustment unit and the isolation unit are connected, and the isolation unit and the feedback unit are connected. The adjustment unit adjusts the power supply voltage of the isolation unit based on the adjustment signal fed back by the calibration module through the optocoupler module. The isolation unit is used to acquire and isolate the temperature signal. The feedback unit is used to feed back the isolated temperature signal to the demand-side chip. The isolation unit includes resistors R1, R2, R3, and R26, operational amplifiers U1 and U2, coupling modules U3, U4, and U5, capacitor C1, and connector P1. The non-inverting input of operational amplifier U1 is connected to connector P1, the inverting input is connected to one end of resistor R1, and the output is connected to the other end of resistor R1 and the non-inverting input of operational amplifier U2. The inverting input of operational amplifier U2 is connected to one end of resistor R3, one end of capacitor C1, and the third pin of coupling module U3, and the output is connected to the other end of capacitor C1 and one end of resistor R26. The first pin of coupling module U3 is connected to the other end of resistor R26, the fourth pin is connected to one end of resistor R2, and the second pin is connected to the first pin of coupling module U4. The second pin of coupling module U4 is connected to the first pin of coupling module U5. The other end of resistor R2 is connected to the power supply. The other end of resistor R3 and the second pin of coupling module U5 are connected to the ground terminal.

2. The high-voltage isolation zone temperature acquisition device according to claim 1, characterized in that, The feedback unit includes resistors R4, R5, R6, and R7, operational amplifier U6, field-effect transistor Q2, connector P2, connector P3, and connector P4. One end of resistor R4 is connected to the fourth pin of coupling module U5, and the other end is connected to the power supply; the non-inverting input of operational amplifier U6 is connected to the third pin of coupling module U5 and one end of resistor R5, the inverting input is connected to one end of resistor R6, and the output is connected to the drain of field-effect transistor Q2 and connector P3; the gate of field-effect transistor Q2 is connected to connector P4, and the source is connected to one end of resistor R7 and connector P2; the other ends of resistor R5 and resistor R7 are connected to the ground terminal.

3. The high-voltage isolation zone temperature acquisition device according to claim 1, characterized in that, The correction module includes resistors R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, and operational amplifiers U7, U8, and U9. One end of resistor R8 and one end of resistor R13 are connected to the power supply, and the other end is connected to the fourth pin of coupling module U4; the non-inverting input of operational amplifier U7 is connected to the third pin of coupling module U4 and one end of resistor R9, the inverting input is connected to one end of resistor R10, and the output is connected to the other end of resistor R10, one end of resistor R11, and one end of resistor R17; the non-inverting input of operational amplifier U8 is connected to the other end of resistor R11 and one end of resistor R12, and the inverting input is connected to one end of resistor R15 and one end of resistor R16. Connect the output terminal to the other end of resistor R16; connect the non-inverting input of op-amp U9 to the other end of resistor R17 and one end of resistor R18, connect the inverting input to one end of resistor R19 and one end of resistor R20, and connect the output terminal to the other end of resistor R19; connect the other end of resistor R13 to one end of resistor R14, the other end of resistor R15, and the other end of resistor R18; connect the other ends of resistor R9, resistor R12, resistor R14, and resistor R20 to the ground terminal.

4. The high-voltage isolation zone temperature acquisition device according to claim 3, characterized in that, The correction module also includes operational amplifier U10, operational amplifier U11, diode D1, diode D2, connector P5, connector P6, connector P7, and resistor R24; The non-inverting input of operational amplifier U10 is connected to the output of operational amplifier U8, the inverting input is connected to the non-inverting input of operational amplifier U11 and connector P5, and the output is connected to the anode of diode D1 and connector P6. The inverting input of op-amp U11 is connected to the output of op-amp U9, and the output is connected to the anode of diode D2 and connector P7; one end of resistor R24 ​​is connected to the cathodes of diodes D1 and D2, and the other end is connected to the ground terminal.

5. The high-voltage isolation zone temperature acquisition device according to claim 4, characterized in that, The calibration module also includes resistors R21, R22, and R23, transistor Q1, and connector P8; One end of resistor R21 is connected to the power supply, and the other end is connected to one end of resistor R22 and the emitter of transistor Q1; the base of transistor Q1 is connected to the cathode of diode D1, and the collector is connected to one end of resistor R23 and connector P8; the other ends of resistor R22 and resistor R23 are connected to the ground terminal.

6. The high-voltage isolation zone temperature acquisition device according to claim 3, characterized in that, The resistor R14 can be an adjustable resistor.

7. The high-voltage isolation zone temperature acquisition device according to claim 2, characterized in that, The feedback unit also includes a resistor R25; One end of the resistor R25 is connected to the gate of the field-effect transistor Q2, and the other end is connected to the ground terminal.

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