JPS5927474U - Electricity detection circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing a conventional electrical quantity detection circuit, Fig. 2 is an equivalent circuit diagram of the above electrical quantity detection circuit, Fig. 3 is a circuit diagram showing a conventional electrical quantity detection circuit of an overcurrent relay, and Fig. 4 is a circuit diagram showing a conventional electrical quantity detection circuit. The figure is a circuit diagram in which this invention is implemented in an electrical quantity detection circuit for an overcurrent relay, and FIG. 5 is an equivalent circuit diagram of FIG. 4. 9 is an input transformer, 10 is a rectifier circuit, 11 is a detection voltage setting section, Tr is a transistor, and Vb is a DC bias voltage. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a device that has a rectifier circuit that rectifies an AC input and a detection circuit that detects whether the output of the rectification circuit is equal to or higher than a predetermined value, between the rectification circuit and the detection circuit, the detection circuit is connected to the rectification circuit. A quantity of electricity detection circuit characterized in that connection is made by applying a DC bias voltage that reduces leakage current.