Detection circuit suitable for on-line temperature of high-voltage solid-state soft starter
A technology of temperature detection circuit and soft starter, which is applied in thermometers, thermometers using electrical devices, and thermometers using directly heat-sensitive electric/magnetic components, etc., which can solve the problem of rising PN junction temperature of thyristors and failure to meet field needs, etc. problem, to achieve high linear accuracy, improve the ability to detect temperature in real time, and high anti-interference effect
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[0017] The present invention will be further described below in conjunction with drawings and embodiments.
[0018] The overall block diagram is as figure 1 shown. A temperature sensor 1, a voltage amplifying circuit 2, a voltage / frequency conversion circuit 3, an optical fiber transmitting circuit 4, an optical fiber receiving circuit 5, a frequency / voltage converting circuit 6, and an A / D circuit 7 are connected in sequence. The present invention is designed on two circuit boards according to high and low voltage isolation, wherein temperature sensor, voltage amplifying circuit, voltage / frequency conversion circuit, optical fiber transmitting circuit are located on the high voltage side circuit board, optical fiber receiving circuit, frequency / voltage converting circuit, A / The D circuit is located on the circuit board in the low voltage section.
[0019] High side detection circuit such as image 3 shown. The temperature signal acquisition circuit 1 is composed of a tem...
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