JPH01146741U

JPH01146741U -

Info

Publication number: JPH01146741U
Application number: JP3383188U
Authority: JP
Priority date: 1988-03-14
Filing date: 1988-03-14
Publication date: 1989-10-11

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例の瞬時電圧低下補
償装置の構成を示すブロツク図、第２図は第１図
の要部の具体構成を示すブロツク図、第３図は瞬
時電圧低下発生時の瞬時電圧低下補償装置の各部
の波形図、第４図は従来例の構成を示すブロツク
図である。１……商用電源、２……負荷、３……結合変圧
器、４……バイパススイツチ、７……インバータ
、８……制御回路、１１……瞬時電圧低下検出回
路、１２……補償起動回路、１３……電圧低下分
検出回路、１４……スイツチイング制御回路、１
５……上限電圧発生回路、１６……スイツチ、１
７……切替制御回路。 Figure 1 is a block diagram showing the configuration of an instantaneous voltage drop compensator according to an embodiment of this invention, Figure 2 is a block diagram showing the specific configuration of the main parts of Figure 1, and Figure 3 is a block diagram showing the configuration of an instantaneous voltage drop compensator according to an embodiment of this invention. FIG. 4 is a block diagram showing the configuration of a conventional example. DESCRIPTION OF SYMBOLS 1... Commercial power supply, 2... Load, 3... Coupling transformer, 4... Bypass switch, 7... Inverter, 8... Control circuit, 11... Instantaneous voltage drop detection circuit, 12... Compensation starting circuit , 13... Voltage drop detection circuit, 14... Switching control circuit, 1
5... Upper limit voltage generation circuit, 16... Switch, 1
7...Switching control circuit.

Claims

[Scope of utility model registration request]

A coupling transformer having a secondary winding inserted in series in the power supply path from the commercial power source to the load, a bypass switch connected in parallel to the secondary winding of the coupling transformer, and a bypass switch connected to the primary winding of the coupling transformer. The connected inverter and
an instantaneous voltage drop detection circuit that detects a voltage drop exceeding a predetermined percentage with respect to a rated value of the voltage of the commercial power source and generates a voltage drop detection signal; a compensation starting circuit that shuts off the inverter and starts supplying the compensation voltage to the coupling transformer; a voltage drop detection circuit that detects a drop in the voltage of the commercial power source from a rated value; an upper limit voltage generation circuit that generates an upper limit voltage corresponding to the maximum voltage at which the voltage-time product of the compensation voltage does not exceed the voltage-time product rating of the coupling transformer in accordance with the application start phase; and an output of the voltage drop detection circuit. A switch for selecting either the voltage or the upper limit voltage of the upper limit voltage generation circuit, and a switch that compares the output voltage of the voltage drop detection circuit with the upper limit voltage of the upper limit voltage generation circuit, and compares the output voltage of the voltage drop detection circuit with the upper limit voltage of the upper limit voltage generation circuit, and Controlling the switch to selectively output the smaller of the output voltage of the voltage drop detection circuit and the upper limit voltage of the upper limit voltage generation circuit during the phase period, and then outputting the output voltage of the voltage drop detection circuit. a switching control circuit that controls the switch so as to switch the inverter in accordance with the voltage selected by the switch, thereby controlling the commercial power supply within a range that does not exceed the voltage-time product rating of the coupling transformer; a switching control circuit that causes the inverter to generate a compensation voltage that compensates for the voltage drop of the instantaneous voltage drop compensator.