阅读说明：本技术 一种智能tec温度控制电路 (Intelligent TEC temperature control circuit ) 是由 蔡震 顾泽良 吉俊文 李琮 于 2021-08-06 设计创作，主要内容包括：本发明公开了一种智能TEC温度控制电路,其特征在于：包括与TEC连接的单片机主控电路、温度采集电路、电流采样电路、电压控制电路、H桥及开关电源,所述温度采集电路用于采集TEC的工作温度；所述电流采集电路用于采集TEC的工作电流；所述电压控制电路用于设置开关电源的电压；所述开关电源输出TEC的工作电压至所述H桥；所述H桥在所述单片机主控电路的控制下,用于控制TEC加热或制冷的切换；所述单片机主控电路用于将温度采集电路、电流采集电路采集的数据进行分析处理,并控制电压控制电路的输出电压、开关电源以及H桥的工作。本发明实现了TEC精确的温控,而且电路结构简单,成本低廉,适用范围广。(The invention discloses an intelligent TEC temperature control circuit, which is characterized in that: the thermoelectric power generation device comprises a single chip microcomputer main control circuit connected with the TEC, a temperature acquisition circuit, a current sampling circuit, a voltage control circuit, an H bridge and a switching power supply, wherein the temperature acquisition circuit is used for acquiring the working temperature of the TEC; the current acquisition circuit is used for acquiring the working current of the TEC; the voltage control circuit is used for setting the voltage of the switching power supply; the switching power supply outputs the working voltage of the TEC to the H bridge; the H bridge is used for controlling the heating or refrigerating switching of the TEC under the control of the singlechip master control circuit; the singlechip main control circuit is used for analyzing and processing data acquired by the temperature acquisition circuit and the current acquisition circuit and controlling the output voltage of the voltage control circuit, the switching power supply and the H bridge. The invention realizes the accurate temperature control of the TEC, and has the advantages of simple circuit structure, low cost and wide application range.)

1. The utility model provides an intelligence TEC temperature control circuit which characterized in that: comprises a singlechip main control circuit connected with a TEC, a temperature acquisition circuit, a current sampling circuit, a voltage control circuit, an H bridge and a switch power supply,

the temperature acquisition circuit is used for acquiring the working temperature of the TEC;

the current acquisition circuit is used for acquiring the working current of the TEC;

the voltage control circuit is used for setting the voltage of the switching power supply;

the switching power supply outputs the working voltage of the TEC to the H bridge;

the H bridge is used for controlling the heating or refrigerating switching of the TEC under the control of the singlechip master control circuit;

the singlechip main control circuit is used for analyzing and processing data acquired by the temperature acquisition circuit and the current acquisition circuit and controlling the output voltage of the voltage control circuit, the switching power supply and the H bridge.

2. The intelligent TEC temperature control circuit of claim 1, wherein: the working target temperature of the TEC is preset in the single chip microcomputer main control circuit.

3. The intelligent TEC temperature control circuit of claim 1, wherein: the voltage range output by the switching power supply is 5V-36V.

Technical Field

The invention relates to the field of temperature control of avalanche diodes, in particular to an intelligent TEC temperature control circuit.

Background

With the growing demand for developing photoelectric countermeasure systems, the development of temperature control of avalanche diodes has been paid more attention as an important component thereof

The most common temperature control circuits used at home and abroad are the Meixin and Analog special control chips or the PWM control mode of an H bridge. For example, the American-believed special control chips are MAX8521, Max1968, MAX1978 and the like, the special control chips are simple to use and have short development period, but the working voltage of the special control chips is 5.5V at most, and the output power of the special control chips is less than 15W. In addition, the other PWM control mode of the H bridge controls the direction and the magnitude of the current by using the traditional motor control mode, the hardware technical requirements of developers are relatively high, the circuit debugging is relatively complex, and the requirement on the digital processing capacity of a singlechip is relatively high.

Disclosure of Invention

The invention aims to provide an intelligent TEC temperature control circuit, which realizes the temperature control of the TEC by using the structure, is suitable for the application of different powers, has wider application range, simpler structure and lower cost.

In order to achieve the purpose, the invention adopts the technical scheme that: an intelligent TEC temperature control circuit comprises a single chip microcomputer main control circuit connected with the TEC, a temperature acquisition circuit, a current sampling circuit, a voltage control circuit, an H bridge and a switching power supply,

the temperature acquisition circuit is used for acquiring the working temperature of the TEC;

the current acquisition circuit is used for acquiring the working current of the TEC;

the voltage control circuit is used for setting the voltage of the switching power supply;

the switching power supply outputs the working voltage of the TEC to the H bridge;

the H bridge is used for controlling the heating or refrigerating switching of the TEC under the control of the singlechip master control circuit;

the singlechip main control circuit is used for analyzing and processing data acquired by the temperature acquisition circuit and the current acquisition circuit and controlling the output voltage of the voltage control circuit, the switching power supply and the H bridge.

In the technical scheme, the working target temperature of the TEC is preset in the single chip microcomputer main control circuit.

In the above technical solution, the voltage range output by the switching power supply is 5V to 36V.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

1. the invention has simple structure, is suitable for temperature control application with different powers, has lower cost and wider application range;

2. the invention can monitor the working temperature and current of the TEC in real time, is convenient for real-time control of temperature control, and can stabilize the temperature of the avalanche diode and reduce dark noise;

3. according to the invention, the current is adjusted by changing the output voltage by utilizing the characteristic of approximate resistance of the TEC, and the output voltage is calculated by utilizing the singlechip main control circuit through setting the target temperature and is used for controlling the output voltage of the switching power supply, so that the working current of the TEC is changed, and the control and adjustment of the working temperature of the TEC are further realized.

Drawings

Fig. 1 is a schematic structural diagram in a first embodiment of the present invention.

Wherein: 1. a single chip microcomputer master control circuit; 2. a temperature acquisition circuit; 3. a current sampling circuit; 4. a voltage control circuit; 5. an H bridge; 6. a power supply is switched on and off.

Detailed Description

The invention is further described with reference to the following figures and examples:

the first embodiment is as follows: referring to fig. 1, an intelligent TEC temperature control circuit comprises a single chip microcomputer main control circuit 1, a temperature acquisition circuit 2, a current sampling circuit 3, a voltage control circuit 4, an H-bridge 5 and a switching power supply 6 which are connected with a TEC,

the temperature acquisition circuit is used for acquiring the working temperature of the TEC;

the current acquisition circuit is used for acquiring the working current of the TEC;

the voltage control circuit is used for setting the voltage of the switching power supply;

the switching power supply outputs the working voltage of the TEC to the H bridge;

the H bridge is used for controlling the heating or refrigerating switching of the TEC under the control of the singlechip master control circuit;

the singlechip main control circuit is used for analyzing and processing data acquired by the temperature acquisition circuit and the current acquisition circuit and controlling the output voltage of the voltage control circuit, the switching power supply and the H bridge.

The working target temperature of the TEC is preset in the single chip microcomputer main control circuit.

In this embodiment, the TEC is used to control the temperature of the avalanche diode, so as to stabilize the temperature and current output of the avalanche diode and reduce the dark noise. When the intelligent thermoelectric cooler works, the temperature acquisition circuit and the current acquisition circuit respectively acquire and monitor the working temperature and the working current of the TEC in real time and feed back data to the single chip microcomputer main control circuit, the single chip microcomputer main control circuit can input the working target temperature of the TEC through the digital display control module in advance, the single chip microcomputer main control circuit analyzes whether the temperature and the current are in a specified range according to the acquired data, if the temperature is out of the target temperature range, the single chip microcomputer main control circuit can control the voltage control circuit to adjust the output voltage of the voltage control circuit, then the voltage control circuit can control the output voltage of the switching power supply, the output voltage of the switching power supply is the working voltage of the TEC, the switching power supply outputs the working voltage of the TEC to the H bridge, and the H bridge controls the heating or refrigerating switching of the TEC under the control of the single chip microcomputer main control circuit. In this embodiment, the operating voltage of the TEC is changed, that is, the output voltage is adjusted to adjust the output current, so as to adjust the temperature of the TEC, which is lower in cost. Moreover, in this embodiment, after the output voltage is adjusted, the working current of the TEC is also changed, and the current collection circuit is used to collect the working current of the TEC, so that the output voltage can be adjusted in real time, the temperature of the TEC can be controlled in time, the adjustment convenience is good, the accurate temperature control can be realized, the cost is low, and the circuit structure is simple.

Moreover, only the output voltage needs to be changed, and the noise of the switching power supply can be reduced.

The voltage range output by the switching power supply is 5V-36V. The working voltage range is wide.

The H bridge is an MOS (metal oxide semiconductor) tube, and if the temperature control circuit needs different powers in different occasions, the switching power supply and the MOS tube in different models can be selected, so that the application range is wide, the flexibility of the temperature control circuit adjustment is good, and the application range is wide.