Isolation detection circuit of DC bus voltage
A DC bus voltage and detection circuit technology, which is applied in voltage/current isolation, current/voltage measurement, measuring devices, etc., can solve the problems of small LED current, poor anti-interference ability, large detection error, etc., and achieve simple circuit, Low cost and great prospects for popularization and application
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0022] Such as figure 2 and 3 A DC bus voltage isolation detection circuit is shown, which includes an optical coupling element and a single power supply type dual operational amplifier; the output phototransistors of the two optical coupling elements BG1 and BG2 are connected in series, and the connection point is connected to the same phase or the first operational amplifier U1 The inverting input terminal is powered on the low-voltage side through a DC power supply +E; one of the optocoupler components is used to detect the optocoupler BG1, and its light-emitting diode is connected in series with the high-voltage resistor R1 to detect the DC bus voltage, and the other optocoupler component is used for feedback control Optocoupler BG2; the two input terminals of an operational amplifier U1 are connected to the opposite corners of the equal-arm resis...
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