Direct current side high-voltage detecting method of compressor driver
A high-voltage detection and driver technology, applied in the direction of voltage/current isolation, instruments, measuring devices, etc., can solve the problems of high cost and low cost performance of the system, and achieve the effect of improving the cost performance of the system and reducing costs
Active Publication Date: 2009-10-21
SHANGHAI ELECTRICGROUP CORP
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Problems solved by technology
[0003] The purpose of the present invention is to solve the problems of high cost and low cost performance of the system in the current high voltage detection of the DC side of the compressor driver, and provide a low-cost DC side high voltage detection method of the compressor driver
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[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0016] refer to figure 1 , a high-voltage detection circuit on the DC side of a compressor driver, including a first optocoupler 1, a second optocoupler 2 and an operational amplifier 3, and the first optocoupler 1 and the second optocoupler 2 are connected in series with the compressor to be tested The driver is connected to the DC side, the output terminal of the first optocoupler 1 is connected to the positive input terminal of the operational amplifier 3, and the secondary side 22 input terminal of the second optocoupler is connected to the negative input terminal of the operational amplifier 3. connected to the input end, and the input end of the secondary side 22 of the second optocoupler is connected to the output end of the operational amplifier 3 . 11 in the figure is the primary side of the first optocoupler 1 , and 12 is the second...
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The invention relates to the direct current side high voltage detection of a compressor driver, in particular to a direct current side high-voltage detecting method of a compressor driver, which comprises the following steps: sampling: connecting two same optical couplers including a first optical coupler and a second optical coupler in series at a direct current side high-voltage sampling side of the compressor driver so as to lead the primary current of the first optical coupler to be equal to the primary current of the second optical coupler; building input voltage V+ of an operation amplifier; building feedback voltage V- of the operation amplifier; leading the V+ to be equal to the V-, and building a linear feedback mechanism. Because of adopting the technical scheme, the invention completely solves the problems of high cost and poor cost performance in the direct current side high voltage measurement of the prior compressor driver, obviously lowers the cost of the circuit in the direct current side high voltage detection of the prior compressor driver, and improves the cost performance.
Description
technical field [0001] The invention relates to a high voltage detection method at the direct current side of a compressor driver, in particular to a high voltage detection method at the direct current side of a compressor driver. Background technique [0002] At present, the high-voltage detection on the DC side of the compressor driver requires the use of complex and expensive isolation op-amp circuits. For example, a transformer is used to isolate and convert high-voltage power into low-voltage power and then send it to a comparator to detect the output signal. Corresponding points, so as to detect the corresponding high-voltage electrical signal. The transformer applied in this circuit has loss, which causes the loss of the circuit. Since the detection accuracy of the high voltage on the DC side is not high, it is necessary to reduce the cost of the isolated operational amplifier circuit and improve the cost performance of the system. Contents of the invention [00...
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IPC IPC(8): G01R19/00G01R15/22
Inventor 黄建民王宗暐邬雁忠齐亮王振滨李劲唐丽婵
Owner SHANGHAI ELECTRICGROUP CORP