JPH01134941U

JPH01134941U -

Info

Publication number: JPH01134941U
Application number: JP3141088U
Authority: JP
Priority date: 1988-03-09
Filing date: 1988-03-09
Publication date: 1989-09-14

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図およ
び第４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５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……スイツチング制御回路、１５
……過大補償電圧発生検出回路、１６……パルス
発生回路、１７……ゲート回路。 FIG. 1 is a block diagram showing the configuration of an instantaneous voltage drop compensator according to an embodiment of this invention, FIG. 2 is a block diagram showing the specific configuration of the main parts of FIG. 1, and FIGS. FIG. 5 is a waveform diagram of each part of the instantaneous voltage drop compensation device when a voltage drop occurs, and FIG. 5 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, 15
...Overcompensation voltage generation detection circuit, 16...Pulse generation circuit, 17...Gate 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 voltage and operates the inverter; a voltage drop detection circuit that detects a drop in the voltage of the commercial power source from the rated value; and a voltage drop detection circuit that detects a voltage drop from the rated value of the commercial power supply; a switching control circuit that causes the inverter to generate a compensation voltage that compensates for the voltage drop of the commercial power supply through switching control; and a switching control circuit that controls the output of the voltage drop detection circuit to a threshold value corresponding to the primary input voltage rating of the coupling transformer. an overcompensation voltage generation detection circuit that generates an overcompensation voltage generation detection signal when the output of the voltage drop detection circuit exceeds a threshold voltage in comparison with the voltage; and an overcompensation voltage generation detection circuit that generates an overcompensation voltage generation detection signal when the output of the voltage drop detection circuit exceeds a threshold voltage; generating a pulse in response to the over-compensated voltage generation detection signal, which corresponds to a closing start phase period in which the voltage-time product of the compensation voltage exceeds the voltage-time product rating of the coupling transformer when the voltage-time product of the compensation voltage is applied to the coupling transformer; An instantaneous voltage drop compensator comprising: a circuit; and a control circuit having a gate circuit that is interposed between the instantaneous voltage drop detection circuit and the compensation starting circuit and shuts off during the pulse generation period.