Semiconductor refrigerator driving device

Abstract

A semiconductor refrigerator driving device comprises a DC-DC converter, an inductor L1, a noise filter network composed of a capacitor C1, a feedback resistor R f , a gain adjusting resistor R1, a PID adjusting circuit, a semiconductor refrigerator and a temperature measuring element. The DC-DC converter avoids using an industrial-grade chip, but uses a space-grade low-ripple DC-DC converter based on inductor current continuous mode, the device level is space-grade, the efficiency is high, the noise is low, and the device has anti-single particle and radiation resistance characteristics, meets the requirements of space application, and has the characteristics of wide refrigeration temperature range and environmental adaptability.

Description

Technical Field

[0001] This invention belongs to the field of temperature control, and specifically relates to a semiconductor cooler driving device. Background Technology

[0002] Semiconductor coolers (TECs), integrated within single-photon detectors (X-ray detectors, APD detectors, lasers, etc.), reduce thermal noise through cryogenic cooling and are the core and key to achieving X-ray single-photon energy spectrum detection. Dedicated TEC driver chips integrate a PWM controller and power driver, offering high integration and conversion efficiency. However, the PWM switching signal noise is significant, interfering with the single-photon detector and increasing dark count noise. Furthermore, industrial-grade TEC driver chips use plastic packaging, resulting in a high scrap rate during warranty periods, which cannot meet the design requirements of aerospace products.

[0003] Most existing temperature control circuits use PWM power drivers to drive the cooler. However, this method has the following main problems:

[0004] (1) The noise is high, which affects the detection of weak signals by the sensor.

[0005] (2) The maximum output voltage of the PWM power driver is a fixed value, and the output voltage cannot be changed by adjusting the external circuit parameters, and it cannot be matched with the parameters of the semiconductor thermoelectric cooler.

[0006] In addition, existing temperature control circuits use linear current source drivers, which have low noise, low conversion efficiency, and high heat dissipation, which is not conducive to the heat dissipation design of semiconductor cooler systems.

[0007] Guokai Keke Quantum Technology (Beijing) Co., Ltd. has announced a method for temperature control of a single-photon detector (TEC). This method uses a digital PID controller to drive a DAC to generate a regulating voltage, which is then connected to the feedback pin of a power supply chip after a series resistor. However, this method mainly suffers from the following problems:

[0008] (1) The default power-on value and output impedance of the DAC affect the voltage regulation network, causing glitches in the cooler drive voltage and damaging the cooler.

[0009] (2) The PID voltage is connected in series with a large resistor and then connected to the feedback pin of the power chip. The resistance of the series resistor is much larger than the voltage regulation resistor, which results in a small range of change of the cooler drive voltage and affects the cooling temperature regulation range. Summary of the Invention

[0010] The technical problem solved by the present invention is to overcome the above-mentioned shortcomings and provide a semiconductor cooler driving device that solves the problems of small range of cooler driving voltage variation and poor environmental adaptability.

[0011] The technical solution of this invention is: a semiconductor cooler driving device, comprising: a DC-DC converter, a noise filtering network, a voltage regulation network, a PID regulation circuit, a semiconductor cooler, and a temperature sensing element; the PID regulation circuit generates an adjustment signal V based on the difference between the measured temperature value of the temperature sensing element and the set target temperature value. pid After passing through voltage regulation resistor R1, the signal is sent to the DC-DC converter and feedback resistor R. f After being converted by a DC-DC converter, the signal is sent to a noise filter network, filtered by the noise filter network, and then sent to a thermoelectric cooler for cooling.

[0012] The DC-DC converter has single-event immunity and radiation resistance, enabling the conversion from input V... in To output V out The conversion of the operating voltage of the semiconductor cooler adopts an aerospace-grade low-ripple DC-DC converter based on continuous inductor current mode, and the device is of aerospace grade.

[0013] The noise filtering network includes an inductor L1 and a capacitor C1, forming an LC filtering network to filter voltage V. out Noise filtering is performed, resulting in a low-noise output drive voltage V. tec One end of inductor L1 is connected to the output V of the DC-DC converter. out Connect one end to the other end, and connect the other end to resistor R. f One end is connected to one end of capacitor C1, and the other end of capacitor C1 is grounded.

[0014] The voltage regulation network includes a feedback resistor R. f The voltage regulation resistor R1 and the feedback resistor Rf are connected at one end to the inductor L1 and the capacitor C1, respectively, and at the other end to the voltage regulation resistor R1 and the V of the DC-DC converter. fb Connected; one end of the voltage regulating resistor R1 is connected to the feedback resistor R f The reference voltage terminal V of the DC-DC converter fb Connected to the other end, and connected to the output V of the PID control network. pid Connected.

[0015] The voltage regulation network is based on the regulation signal V pid Adjust the drive voltage V tec This allows for the regulation of the output voltage of the DC-DC converter and the setting of the upper limit of the output voltage to match the maximum cooling voltage parameter of the semiconductor cooler.

[0016] The PID control circuit generates an adjustment signal V based on the difference between the set temperature value and the actual temperature value measured by the temperature sensing element. pidThe output of the PID control circuit is connected to one end of the voltage regulation resistor R1, and the other end of the voltage regulation resistor R1 is connected to the reference voltage terminal V of the DC-DC converter. ref Connected to regulate the output voltage V of the DC-DC converter. tec This refers to the cooling drive voltage of a semiconductor cooler.

[0017] The adjustment signal V pid It is directly connected to the voltage regulation resistor R1 and operates in voltage-driven mode.

[0018] The advantages of this invention compared to the prior art are:

[0019] (1) The PID voltage output by the PID regulating circuit is directly connected to the voltage regulating resistor of the DC-DC converter, which increases the range of output voltage variation of the DC-DC converter, increases the range of cooling temperature regulation, and improves environmental adaptability.

[0020] (2) DC-DC converter: Instead of using industrial-grade chips, aerospace-grade low-ripple DC-DC converter based on continuous inductor current mode is used. The device is aerospace grade, with high efficiency, low noise and single-event resistance and radiation resistance, meeting the requirements of aerospace applications. Attached Figure Description

[0021] Figure 1 This is a block diagram illustrating the composition principle of an existing semiconductor cooler drive device.

[0022] Figure 2 This is a block diagram illustrating the composition principle of the high-efficiency driving device for the semiconductor cooler of the present invention.

[0023] Figure 3 This is the measured noise waveform of the high-efficiency drive device of the semiconductor cooler of the present invention. Detailed Implementation

[0024] like Figure 1-3 As shown, the present invention provides a semiconductor cooler driving device, comprising: a DC-DC converter, a noise filtering network, a voltage regulation network, a PID control circuit, a semiconductor cooler, and a temperature sensing element; the PID control circuit generates a regulation signal V based on the difference between the measured temperature value of the temperature sensing element and the set target temperature value. pid After passing through voltage regulation resistor R1, the signal is sent to the DC-DC converter and feedback resistor R. f After being converted by a DC-DC converter, the signal is sent to a noise filter network, filtered by the noise filter network, and then sent to a thermoelectric cooler for cooling.

[0025] The DC-DC converter has single-event immunity and radiation resistance, enabling the conversion from input V... in To output Vout The conversion of the operating voltage of the semiconductor cooler adopts an aerospace-grade low-ripple DC-DC converter based on continuous inductor current mode, and the device is of aerospace grade.

[0026] The noise filtering network includes an inductor L1 and a capacitor C1, forming an LC filtering network to filter voltage V. out Noise filtering is performed, resulting in a low-noise output drive voltage V. tec One end of inductor L1 is connected to the output V of the DC-DC converter. out Connect one end to the other end, and connect the other end to resistor R. f One end is connected to one end of capacitor C1, and the other end of capacitor C1 is grounded.

[0027] The voltage regulation network includes a feedback resistor R. f The voltage regulation resistor R1 and the feedback resistor Rf are connected at one end to the inductor L1 and the capacitor C1, respectively, and at the other end to the voltage regulation resistor R1 and the V of the DC-DC converter. fb Connected; one end of the voltage regulating resistor R1 is connected to the feedback resistor R f The reference voltage terminal V of the DC-DC converter fb Connected to the other end, and connected to the output V of the PID control network. pid Connected.

[0028] The voltage regulation network is based on the regulation signal V pid Adjust the drive voltage V tec This allows for the regulation of the output voltage of the DC-DC converter and the setting of the upper limit of the output voltage to match the maximum cooling voltage parameter of the semiconductor cooler.

[0029] The PID control circuit generates an adjustment signal V based on the difference between the set temperature value and the actual temperature value measured by the temperature sensing element. pid The output of the PID control circuit is connected to one end of the voltage regulation resistor R1, and the other end of the voltage regulation resistor R1 is connected to the reference voltage terminal V of the DC-DC converter. ref Connected to regulate the output voltage V of the DC-DC converter. tec This refers to the cooling drive voltage of a semiconductor cooler.

[0030] Existing semiconductor cooler drive devices have a cooling drive signal V tec With PID control signal V pid The relationship is:

[0031] V tec = (1+R) f / R1)V ref +R f / R set V ref -Rf / R set V pid

[0032] The resistance of resistor Rset is much larger than that of R1, and the Vtec voltage adjustment range is determined by R... f / R set Decide.

[0033] The high-efficiency driving device for the semiconductor cooler of the present invention has a cooling driving signal V. tec With PID control signal V pid The relationship is:

[0034] V tec = (1+R) f / R1)V ref -R f / R1V pid

[0035] V tec The voltage regulation range is determined by R f The / R1 value determines the voltage adjustment range and the temperature adaptability range.

[0036] The semiconductor cooler and temperature sensing element utilize the Peltier effect of semiconductor materials to achieve heat absorption at one end and heat release at the other end; the temperature sensing element is located at the cold end of the semiconductor cooler to measure the temperature of the cold end.

[0037] Figure 2 This is a block diagram illustrating the composition principle of the high-efficiency drive device for the semiconductor cooler of the present invention. It consists of a DC-DC converter, a noise filtering network, a voltage regulation network, a PID control circuit, a semiconductor cooler, and a temperature sensing element. The DC-DC converter realizes the voltage from the input V... in To output V out The high-efficiency conversion utilizes an aerospace-grade, low-ripple DC-DC converter based on continuous-mode inductor current. The components are aerospace-grade, exhibiting high efficiency, low noise, and single-event immunity and radiation resistance, meeting aerospace application requirements. The PID control circuit shown outputs a signal V. pid It is directly connected to the voltage regulation resistor R1 and operates in voltage drive mode. Compared with the current drive mode, where a large resistor is connected in series between the PID control signal and the voltage regulation resistor, the voltage drive mode increases the output voltage variation range of the DC-DC converter, expands the cooling temperature regulation range, and has better environmental adaptability.

[0038] Figure 3 The measured noise waveform of the high-efficiency drive device for the semiconductor cooler of this invention is shown. It uses an aerospace-grade low-ripple DC-DC converter based on continuous inductor current mode, which drives the semiconductor cooler after passing through an LC noise filter network.

[0039] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention based on the above-disclosed technical content without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A semiconductor cooler driving device, characterized in that, include: DC-DC converter, noise filtering network, voltage regulation network, PID regulation circuit, semiconductor cooler and temperature sensing element; The PID control circuit generates a control signal based on the difference between the measured temperature value from the temperature sensing element and the set target temperature value. V pid Then through the voltage regulating resistor R 1 is then sent to the DC-DC converter and feedback resistor. R f After being converted by a DC-DC converter, the signal is sent to a noise filter network, filtered by the noise filter network, and then sent to a thermoelectric cooler for cooling. The DC-DC converter has single-event immunity and radiation resistance, enabling switching from input... V in To output V out The conversion of the operating voltage of the semiconductor cooler adopts an aerospace-grade low-ripple DC-DC converter based on continuous inductor current mode, and the device is of aerospace grade. The noise filtering network includes an inductor. L 1 and capacitor C 1. Construct an LC filter network to achieve voltage regulation. V out Noise filtering is performed, resulting in a low-noise output drive voltage. V tec ;inductance L 1. One end connects to the output of the DC-DC converter. V out Connect one end to the other end, and connect the other end to the resistor. R f One end and capacitor C 1. One end is connected, capacitor C 1. The other end is grounded; The voltage regulation network includes a feedback resistor. R f and voltage regulating resistor R 1. Feedback resistor R One end of f is connected to the inductor. L 1 and capacitor C Connect one end to the other end, and connect the other end to the voltage regulating resistor. R 1. DC-DC converter V fb Connected; voltage regulating resistor R 1. One end is connected to the feedback resistor R f Reference voltage terminal of DC-DC converter V fb Connect one end to the other end, and connect the other end to the output of the PID control network. V pid Connected.

2. The semiconductor cooler driving device according to claim 1, characterized in that, The voltage regulation network adjusts according to the regulation signal. V pid Adjust drive voltage V tec This allows for the regulation of the output voltage of the DC-DC converter and the setting of the upper limit of the output voltage to match the maximum cooling voltage parameter of the semiconductor cooler.

3. The semiconductor cooler driving device according to claim 1, characterized in that, The PID control circuit generates an adjustment signal based on the difference between the set temperature value and the actual temperature value measured by the temperature sensing element. V pid The output of the PID control circuit is connected to the voltage regulation resistor. R One end of 1 is a voltage regulating resistor. R The other end of 1 is connected to the reference voltage terminal of the DC-DC converter. V ref Connected to regulate the output voltage of the DC-DC converter. V tec This refers to the cooling drive voltage of a semiconductor cooler.

4. A semiconductor cooler driving device according to claim 3, characterized in that, The adjustment signal V pid With voltage regulating resistor R 1. Directly connected, operating in voltage-driven mode.

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