Refrigeration power control circuit for semiconductor detector

Abstract

The invention discloses a refrigeration power control circuit for a semiconductor detector, comprising a power output end providing current to a temperature sensor in the detector. Signals of the temperature sensor arranged in the detector pass through an in-phase amplifying circuit, and the amplified signals enter a feedback voltage input end of a DC / DC conversion circuit after voltage division through a voltage dividing circuit to carry out regulation on refrigeration voltage. The invention substitutes a three-terminal regulator by applying the DC / DC conversion circuit in the refrigeration circuit of the detector, is convenient to control, and has high power utilization ratio. The DC / DC conversion circuit is used to utilize temperature feedback of a probe to regulate amplitude of output voltage, and the requirement of refrigeration can be accurately and rapidly achieved.

Description

technical field [0001] The invention relates to the field of power circuit control, in particular to a semiconductor detector refrigeration power control circuit. Background technique [0002] Commonly used semiconductor detectors include: Si-Pin photodiode detectors, silicon drift detectors SDD, lithium drift silicon detectors Si(Li), etc. Existing detectors often require detectors to work at a constant low temperature. For example, -20°C, this requires precise control of the refrigeration device to ensure its refrigeration temperature. Generally, the refrigeration power supply is used to control the refrigeration temperature. In the prior art, the refrigeration power supply is controlled by a power control circuit composed of a three-terminal voltage regulator. regulated, such as figure 1 As shown, according to the temperature feedback of the Si-Pin probe, the cooling voltage is adjusted through the power control circuit composed of the three-terminal voltage regulator. F...

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Problems solved by technology

[0003] In the above circuit, two voltage values ​​need to be set, namely, the voltage set by R39 is -2.583V and the voltage set by R52, R57, and R65, which makes the circuit extremely complicated; at the same time, under normal circumstances, the cooling voltage of the detector If it is 2.2V, then the utilization rate of 5v power supply is 2.2V / 5V=44%, which is very low; and because of the lag of the feedback control loop, at the moment of power-on, the output of the refrigeration voltage will have a amplitude A pulse with a value as high as 5V will cause certain damage to various components

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