JPS59162668U - Negative phase detection circuit for power conversion equipment - Google Patents

Abstract

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

Description

[Brief explanation of the drawing]

FIGS. 1 and 2 are main part configuration diagrams of a power conversion device with a pure bridge connection example, and control signal waveform diagrams of its thyristors,
FIG. 3 is a system diagram showing the main structure of an embodiment of the present invention, and FIGS. 4, 5, and 6 are waveform diagrams shown for explaining FIG. 3. 1... Three-phase AC power supply, 2... Power converter, 3... Power failure detector, 4... Delay device, 5...・D flip-flop, 6...
Disjunction gate.

Claims (1)

[Scope of utility model registration request] In a device that obtains AC power through a switching element connected in a bridge and converts the power of the AC power source, an output signal of a power failure detector that detects a power failure of the AC power source is inputted to a set terminal, and a predetermined value of the AC power source is a D flip-flop that receives one of the pulse input signals synchronized with the two phases of the clock input terminal and the other one to the D input terminal; the output of the delay device that obtains the output signal of the power failure detector; and the output of the D flip-flop that receives the output signal of the power outage detector. What is claimed is: 1. A negative phase detection circuit for a power conversion device, comprising: an OR gate;