CN210514957U

CN210514957U - TEC control circuit

Info

Publication number: CN210514957U
Application number: CN201921342189.7U
Authority: CN
Inventors: 沈政量
Original assignee: Xiamen Huayuan Jiahang Technology Co ltd
Current assignee: Xiamen Huayuan Jiahang Technology Co ltd
Priority date: 2019-08-19
Filing date: 2019-08-19
Publication date: 2020-05-12
Anticipated expiration: 2029-08-19

Abstract

The utility model belongs to fiber optic gyroscope sensor field especially relates to a TEC control circuit, and wherein PID circuit and comparator circuit input are connected to the temperature acquisition circuit output, and PID circuit output connects signal processing circuit input, and PWM circuit input is connected to the signal processing circuit output, and H bridge drive circuit input is connected to the PWM circuit output, and H bridge drive circuit's direction control end is connected to comparator circuit output. The utility model has the advantages that: when the environmental temperature changes, the temperature acquisition circuit outputs the offset to the temperature change direction detection circuit and the PID circuit, the PID circuit performs proportional-integral-derivative operation on the signal and outputs the signal to the signal processing circuit, the signal processing circuit judges the signal and then sends the signal to the PWM circuit, the PWM circuit generates a PWM signal corresponding to the pulse width and outputs the PWM signal to the H-bridge driving circuit, and the H-bridge driving circuit determines the H-bridge driving direction through the temperature change direction detection circuit to realize the control of the TEC, so that the temperature is controlled.

Description

TEC control circuit

Technical Field

The utility model belongs to fiber optic gyroscope sensor field especially relates to a TEC control circuit.

Background

In recent years, optical fiber gyroscopes have been increasingly used due to their excellent properties. The core device laser is sensitive to temperature, and the temperature change can influence the wavelength stability and the optical power stability of the core device laser, so that the stability and the reliability of the gyroscope are influenced. In order to ensure the temperature stability and reliability of the laser, the TEC arranged on the laser and the TEC control circuit are used for controlling the TEC on the laser to ensure the temperature stability of the laser, thereby ensuring the reliability and stability of the fiber-optic gyroscope. The existing TEC control circuit has the defects of high cost, low efficiency and high power consumption.

SUMMERY OF THE UTILITY MODEL

To solve the above problems. The utility model provides a TEC control circuit.

The technical scheme of the utility model: a TEC control circuit can be used for temperature control of a pump laser, and comprises a temperature acquisition circuit, a comparator circuit, a PID circuit, a signal processing circuit, a PWM circuit and an H-bridge drive circuit, wherein the output end of the temperature acquisition circuit is connected with the input end of the comparator circuit and the input end of the PID circuit, the output end of the PID circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the PWM circuit, the output end of the PWM circuit is connected with the input end of the H-bridge drive circuit, and the output end of the comparator circuit is connected with the direction control end of the H-bridge control circuit;

the temperature acquisition circuit converts the temperature change value into an electric signal and outputs the electric signal to the next stage.

And the comparator circuit compares the value output by temperature acquisition with a set value and outputs the value to the direction control end of the H-bridge drive circuit.

The PID circuit performs proportional-integral-derivative operation on the value output by the first amplifier.

The signal processing circuit processes the value output by the PID circuit.

And the PWM circuit controls the H-bridge driving circuit.

The H-bridge driving circuit drives the TEC.

The temperature acquisition circuit adopts a resistor balance bridge for input, when the ambient temperature changes, the resistance value of the thermistor also changes, the resistor balance bridge is unbalanced, and the offset is output through the operational amplifier.

The comparator circuit compares and judges the signals output by the temperature acquisition circuit through the operational amplifier, determines the change direction of the temperature, outputs the signals to the H-bridge drive circuit module, and determines the direction of the H-bridge drive circuit.

And the PID circuit performs proportional-integral-derivative operation on the signal output by the temperature acquisition circuit and outputs the signal to the signal processing circuit.

And the signal processing circuit compares and analyzes the signals output by the PID and outputs the signals to the PWM control circuit. And judging the normal value and directly sending the normal value into the PWM circuit, and processing the abnormal value by the operational amplifier and then entering the PWM circuit.

And the PWM circuit controls and adjusts PWM according to the signal output by the signal processing circuit and outputs the PWM signal to the H-bridge driving circuit.

The H-bridge driving circuit controls the driving direction of the H-bridge by the temperature change direction detection circuit, and the PWM signal output by the PWM circuit controls the current of the TEC.

The utility model has the advantages that: when the environmental temperature changes, the temperature acquisition circuit outputs the offset to the temperature change direction detection circuit and the PID circuit, and the PID circuit outputs the signal to the signal processing circuit after carrying out proportional integral derivative operation on the signal. The signal processing circuit judges the signal and sends the signal to the PWM circuit, and the PWM circuit generates a PWM signal with corresponding pulse width according to the input signal and outputs the PWM signal to the H-bridge driving circuit. The H-bridge driving circuit determines the direction of H-bridge driving through the temperature change direction detection circuit, and controls the TEC through PWM input control driving current, so that the temperature is controlled, and the high-power-consumption high-temperature thermoelectric cooler is high in working efficiency, low in power consumption and low in cost.

Drawings

Fig. 1 is a block diagram of the present invention.

Fig. 2 is a circuit diagram of the temperature acquisition circuit of the present invention.

Fig. 3 is a circuit diagram of a comparator circuit of the present invention.

Fig. 4 is a circuit diagram of the H-bridge driving circuit of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.

Example 1

A TEC control circuit comprises a temperature acquisition circuit, a comparator circuit, a PID circuit, a signal processing circuit, a PWM circuit and an H bridge driving circuit which are electrically connected, wherein the output end of the temperature acquisition circuit is connected with the input ends of the PID circuit and the comparator circuit, the output end of the PID circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the PWM circuit, the output end of the PWM circuit is connected with the input end of the H bridge driving circuit, and the output end of the comparator circuit is connected with the direction control end of the H bridge driving circuit;

and the temperature acquisition circuit converts the temperature change value into an electric signal and outputs the electric signal to the next stage.

And a PID circuit for performing proportional-integral-derivative operation on the value output by the first amplifier.

And a signal processing circuit for processing the value output from the PID circuit.

And a PWM circuit for controlling the H-bridge drive circuit.

And the H-bridge driving circuit drives the TEC.

The temperature detection circuit adopts a resistor balance bridge for input, when the ambient temperature changes, the resistance value of the thermistor also changes, the resistor balance bridge is unbalanced, and the offset is output through the operational amplifier.

And the comparator circuit determines the change direction of the temperature by comparing and judging the signal output by the temperature detection circuit through the operational amplifier, outputs the signal to the H-bridge drive circuit module and determines the direction of the H-bridge drive circuit.

And the PWM circuit is used for controlling and adjusting PWM according to the signal output by the signal processing circuit and outputting a PWM signal to the H-bridge driving circuit.

And the H-bridge driving circuit controls the driving direction of the H-bridge by the temperature change direction detection circuit, and the PWM signal output by the PWM circuit controls the current of the TEC.

Example 2

A TEC control circuit can be used for temperature control of a pump laser and comprises a temperature acquisition circuit, a comparator circuit, a PID (proportion integration differentiation) circuit, a signal processing circuit, a PWM (pulse width modulation) circuit and an H-bridge drive circuit, wherein the temperature acquisition circuit, the comparator circuit, the PID circuit, the signal processing circuit, the PWM circuit and the H-bridge drive circuit are electrically connected;

And a PWM circuit for controlling the H-bridge drive circuit.

And the H-bridge driving circuit drives the TEC.

The output end of the temperature acquisition circuit is connected with the input end of the comparator circuit and the input end of the PID circuit, the output end of the PID circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the PWM circuit, the output end of the PWM circuit is connected with the input end of the H-bridge drive circuit, and the output end of the comparator circuit is connected with the direction control end of the H-bridge control circuit.

And the comparator circuit determines the change direction of the temperature by comparing and judging the signals output by the temperature acquisition circuit through the operational amplifier, outputs the signals to the H-bridge drive circuit module and determines the direction of the H-bridge drive circuit.

Example 3

Fig. 1 is a block diagram of the present invention. The TEC control circuit comprises a temperature acquisition circuit, a comparator circuit, a PID circuit, a signal processing circuit, a PWM circuit and an H bridge driving circuit which are electrically connected, and is characterized in that the output end of the temperature acquisition circuit is connected with the input end of the PID circuit and the input end of the comparator circuit, the output end of the PID circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the PWM circuit, the output end of the PWM circuit is connected with the input end of the H bridge driving circuit, and the output end of the comparator circuit is connected with the direction control end of the.

Fig. 2 is a circuit diagram of the temperature acquisition circuit of the present invention. And the temperature acquisition circuit converts the temperature change value into an electric signal and outputs the electric signal to the PID circuit and the comparator circuit.

The temperature acquisition circuit adopts a resistance balance bridge structure; the resistance balance bridge structure is connected with the input end of the first amplifier N1; the resistor balance bridge structure comprises a thermistor NTC, a resistor R1, a resistor R2 and a resistor R3;

one ends of the second resistor R2 and the thermistor NTC are connected with the positive input end of the first amplifier N1; one ends of the third resistor R3 and the first resistor R1 are connected with the inverting input end of the first amplifier N1; the output of the first amplifier N1 is connected to the input of the PID circuit and to the input of the comparator circuit.

The other ends of the second resistor R2 and the third resistor R3 are connected with the REF power supply end, and the other ends of the NTC thermistor and the first resistor R1 are connected with the ground end.

Fig. 3 is a circuit diagram of a comparator circuit of the present invention. And the comparator circuit compares the value output by temperature acquisition with a set value, judges the direction of temperature change and outputs the compared value to the direction control end of the H-bridge drive circuit.

The comparator circuit comprises a fourth resistor R4, a fifth resistor R5 and a third amplifier N3, wherein the fourth resistor R4 and the fifth resistor R5 are connected with the inverting input end of the third amplifier N3, specifically, the fourth resistor R4 and the fifth resistor R5 are connected with the inverting input end of the third amplifier N3, the inverting input end of the third amplifier N3 of the comparator circuit is connected with the output end of the first amplifier N1, the output end of the third amplifier N3 is connected with the input end of the H-bridge driving circuit, and the fifth resistor is connected with the ground end.

And a PID circuit for performing a proportional integral derivative operation on the value output from the first amplifier N1 and outputting the result to the signal processing circuit. And the signal processing circuit compares and analyzes the signals output by the PID and outputs the signals to the PWM control circuit, the normal values are judged and directly sent to the PWM circuit, and the abnormal values are processed by the operational amplifier and then enter the PWM circuit.

And the PWM circuit is used for controlling and adjusting PWM according to the signal output by the signal processing circuit, outputting the PWM signal to the H-bridge driving circuit and controlling the H-bridge driving circuit.

Fig. 4 is a circuit diagram of the H-bridge driving circuit of the present invention. The value output by the comparator circuit and the value output by the PWM circuit are output to the H-bridge driving circuit to control the conduction direction and the current of the H-bridge driving circuit; the H-bridge driving circuit can adjust and control the current of the TEC through a core signal output by the PWM, and drive and control the TEC.

The H-bridge driving circuit comprises a sixth resistor R6, a field-effect tube G1, a triode Q1, a triode Q4, an inductor L1, a capacitor C11, an eighth resistor R8, a grid electrode of the field-effect tube G3 and a ninth resistor R9;

the sixth resistor R6 is connected with the grid and the drain of the field-effect tube G1, the base of the triode Q1 is connected with the output end of the PWM circuit, the collector of the triode Q1 is connected with the grid of the field-effect tube G1, the emitter of the triode Q1 is connected with the collector of the triode Q4, and the base of the triode Q4 is connected with the output end of the comparator circuit;

the source of the field effect transistor G1 is connected to the source of the inductor L1 and the field effect transistor G3, the inductor L1 is connected to the capacitor C11 and the eighth resistor R8, the gate of the field effect transistor G3 is connected to the ninth resistor R9 and the collector of the transistor Q5, and the base of the transistor Q5 is connected to the output of the comparator.

The H-bridge driving circuit further comprises a seventh resistor R7, a field-effect tube G2, a triode Q2, a triode Q3, an inductor L2, a capacitor C12, a field-effect tube G4, a tenth resistor R10 and a triode Q6;

the seventh resistor R7 is connected with the grid and the drain of the field-effect tube G2, the base of the triode Q2 is connected with the output end of the PWM circuit, the collector of the triode Q2 is connected with the grid of the field-effect tube G2, the emitter of the triode Q2 is connected with the collector of the triode Q3, and the base of the triode Q3 is connected with the output end of the comparator circuit;

the source of the field effect transistor G2 is connected with the source of the inductor L2 and the field effect transistor G4, the inductor L2 is connected with the capacitor C12, the grid of the field effect transistor G4 is connected with the tenth resistor R10 and the collector of the triode Q6, and the base of the triode Q6 is connected with the output end of the comparator.

Example 4

Fig. 1 is a block diagram of the present invention. The TEC control circuit comprises a temperature acquisition circuit, a comparator circuit, a PID circuit, a capacitor, a circuit, a PWM circuit and an H-bridge drive circuit, wherein the output end of the temperature acquisition circuit is connected with the input ends of the PID circuit and the comparator circuit, the output end of the PID circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the PWM circuit, the output end of the PWM circuit is connected with the input end of the H-bridge drive circuit, and the output end of the comparator circuit is connected with the direction control end of the H-;

fig. 2 is a circuit diagram of the temperature acquisition circuit of the present invention. When the environmental temperature changes, the resistance value of the NTC thermistor changes, so that the balance bridge is deviated, amplified by the first amplifier N1 and output to the comparator circuit and the PID circuit.

Specifically, the second resistor R2 is connected to the NTC resistor and the positive input terminal of the first amplifier N1, and the third resistor R3 is connected to the first resistor R1 and the negative input terminal of the first amplifier N1. The output of the first amplifier N1 is connected to the input of the PID circuit and to the inverting input of the third amplifier N3 of the comparator circuit.

The second resistor R2 and the third resistor R3 in the temperature acquisition circuit need to be connected with a REF power supply end, and the NTC thermistor and the first resistor R1 need to be connected with a ground end.

The eighth pin and the fourth pin of the first amplifier N1 in the temperature acquisition circuit need to be connected to the power supply and the ground terminal respectively.

Fig. 3 is a circuit diagram of a comparator circuit of the present invention. And the comparator circuit compares the value output by the temperature acquisition circuit with a set value so as to judge the direction of temperature change, and outputs the compared value to the H-bridge drive circuit.

Specifically, the fourth resistor R4 is connected to the fifth resistor R5 and to the inverting input of the third amplifier N3, and the output of the third amplifier N3 is connected to the input of the H-bridge driver circuit.

The fifth resistor of the comparator circuit needs to be connected to ground.

The eighth pin and the fourth pin of the third amplifier of the comparator circuit need to be connected to a power supply terminal and a ground terminal, respectively.

And the signal processing circuit compares and analyzes the signals output by the PID and outputs the signals to the PWM control circuit, the normal values are judged and directly sent to the PWM circuit, and the abnormal values are processed by the operational amplifier and then enter the PWM circuit.

Fig. 3 is a circuit diagram of a comparator circuit of the present invention. The value output by the comparator circuit and the value output by the PWM circuit are output to the H-bridge drive circuit to control the direction and the current of the H-bridge drive circuit, so that the TEC is controlled.

Specifically, the sixth resistor R6 is connected to the gate and drain of the fet G1, the base of the transistor Q1 is connected to the output of the PWM circuit, the collector of the transistor Q1 is connected to the gate of the fet G1, the emitter of the transistor Q1 is connected to the collector of the transistor Q4, and the base of the transistor Q4 is connected to the output of the comparator circuit. The source of the field effect transistor G1 is connected to the source of the inductor L1 and the field effect transistor G3, the inductor L1 is connected to the capacitor C11 and the eighth resistor R8, the gate of the field effect transistor G3 is connected to the ninth resistor R9 and the collector of the transistor Q5, and the base of the transistor Q5 is connected to the output of the comparator. The seventh resistor R7 is connected with the grid and the drain of the field effect transistor G2, the base of the triode Q2 is connected with the output end of the PWM circuit, the collector of the triode Q2 is connected with the grid of the field effect transistor G2, the emitter of the triode Q2 is connected with the collector of the triode Q3, and the base of the triode Q3 is connected with the output end of the comparator circuit. The source of the field effect transistor G2 is connected with the source of the inductor L2 and the field effect transistor G4, the inductor L2 is connected with the capacitor C12, the grid of the field effect transistor G4 is connected with the tenth resistor R10 and the collector of the triode Q6, and the base of the triode Q6 is connected with the output end of the comparator.

The H-bridge driving circuit is provided with devices which need to be connected with a power supply VCC, and the devices comprise a drain electrode of a field effect transistor G1, a drain electrode of a field effect transistor G2, a ninth resistor R9 and a tenth resistor R10 which need to be connected with a power supply VCC end.

The H-bridge driving circuit is provided with devices which need to be connected with the ground, and the devices comprise an emitter of a triode Q4, a capacitor C11, an emitter of a triode Q5, a drain of a field-effect tube G3, an emitter of a triode Q3, a capacitor C12, an emitter of a triode Q6 and a drain of a field-effect tube G4, which need to be connected with the ground.

The utility model discloses a temperature acquisition circuit gathers the temperature variation, export for comparator circuit and PID circuit, the PID circuit carries out the PWM circuit after the proportional-integral-derivative, the PWM circuit exports corresponding PWM signal according to the value of PID circuit output, export H bridge drive circuit and carry out the control current size, the comparator circuit exports H bridge drive circuit's direction control end with the value after the comparison, control H bridge drive circuit's current direction, thereby realize the control to the TEC.

Claims

1. The TEC control circuit comprises a temperature acquisition circuit, a comparator circuit, a PID circuit, a signal processing circuit, a PWM circuit and an H bridge driving circuit which are electrically connected, and is characterized in that the output end of the temperature acquisition circuit is connected with the input end of the PID circuit and the input end of the comparator circuit, the output end of the PID circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the PWM circuit, the output end of the PWM circuit is connected with the input end of the H bridge driving circuit, and the output end of the comparator circuit is connected with a direction control end of the H bridge driving circuit.

2. The TEC control circuit of claim 1, wherein the temperature acquisition circuit converts the temperature variation value into an electrical signal and outputs the electrical signal to the PID circuit and the comparator circuit.

3. The TEC control circuit of claim 2, wherein the temperature acquisition circuit employs a resistance balancing bridge structure; the resistance balance bridge structure is connected with the input end of a first amplifier N1; the resistor balance bridge structure comprises a thermistor NTC, a first resistor R1, a second resistor R2 and a third resistor R3;

one ends of the second resistor R2 and the thermistor NTC are connected with the positive input end of the first amplifier N1; one ends of the third resistor R3 and the first resistor R1 are connected with the inverting input end of the first amplifier N1; the output end of the first amplifier N1 is connected with the input end of the PID circuit and the input end of the comparator circuit;

the other ends of the second resistor R2 and the third resistor R3 are connected with a REF power supply end, and the other ends of the NTC thermistor and the first resistor R1 are connected with a ground end.

4. The TEC control circuit of claim 3, wherein the comparator circuit compares the output value of the temperature acquisition with a set value and determines the direction of the temperature change, and outputs the compared value to the direction control terminal of the H-bridge driving circuit.

5. The TEC control circuit of claim 4, wherein the comparator circuit comprises a fourth resistor R4, a fifth resistor R5 and a third amplifier N3, said fourth resistor R4 and said fifth resistor R5 being connected to the inverting input of said third amplifier N3, in particular said fourth resistor R4 and said fifth resistor R5 and the inverting input of said third amplifier N3, the inverting input of the third amplifier N3 of said comparator circuit being connected to the output of said first amplifier N1, the output of said third amplifier N3 being connected to the input of the H-bridge driver circuit, said fifth resistor being connected to ground.

6. The TEC control circuit of claim 1 or 2, wherein the PID circuit performs PID operation on the value outputted from the first amplifier N1 and outputs the value to the signal processing circuit.

7. The TEC control circuit of claim 1 or 2, wherein the signal processing circuit compares and analyzes the signals outputted from the PID and outputs the signals to the PWM control circuit, the normal values are directly sent to the PWM circuit, and the abnormal values are processed by the operational amplifier and then enter the PWM circuit.

8. The TEC control circuit of claim 1 or 2, wherein the PWM circuit performs PWM control adjustment according to the signal output from the signal processing circuit, and outputs the PWM signal to the H-bridge driving circuit to control the H-bridge driving circuit.

9. The TEC control circuit of claim 1 or 2, wherein the value output by the comparator circuit and the value output by the PWM circuit are output to the H-bridge driver circuit to control the conduction direction and current of the H-bridge driver circuit.

10. The TEC control circuit of claim 9, wherein the H-bridge driver circuit is configured to drive and control the TEC by adjusting the TEC current via a core signal output by the PWM.

11. The TEC control circuit of claim 1 or 10, wherein the H bridge driving circuit comprises a sixth resistor R6, a FET G1, a transistor Q1, a transistor Q4, an inductor L1, a capacitor C11, an eighth resistor R8, a gate of a FET G3, a ninth resistor R9;

the sixth resistor R6 is connected to the gate and drain of the fet G1, the base of the transistor Q1 is connected to the output of the PWM circuit, the collector of the transistor Q1 is connected to the gate of the fet G1, the emitter of the transistor Q1 is connected to the collector of the transistor Q4, and the base of the transistor Q4 is connected to the output of the comparator circuit;

the source of the fet G1 is connected to the source of the inductor L1 and the source of the fet G3, the inductor L1 is connected to the capacitor C11 and the eighth resistor R8, the gate of the fet G3 is connected to the ninth resistor R9 and the collector of the transistor Q5, and the base of the transistor Q5 is connected to the output of the comparator.

12. The TEC control circuit of claim 11, wherein said H-bridge driver circuit further comprises a seventh resistor R7, a fet G2, a transistor Q2, a transistor Q3, an inductor L2, a capacitor C12, a fet G4, a tenth resistor R10, a transistor Q6;

the seventh resistor R7 is connected to the gate and drain of the fet G2, the base of the transistor Q2 is connected to the output of the PWM circuit, the collector of the transistor Q2 is connected to the gate of the fet G2, the emitter of the transistor Q2 is connected to the collector of the transistor Q3, and the base of the transistor Q3 is connected to the output of the comparator circuit;

the source of the fet G2 is connected to the source of the inductor L2 and the source of the fet G4, the inductor L2 is connected to the capacitor C12, the gate of the fet G4 is connected to the tenth resistor R10 and the collector of the transistor Q6, and the base of the transistor Q6 is connected to the output of the comparator.