CN2494576Y

CN2494576Y - HF switch electric source soft starting device

Info

Publication number: CN2494576Y
Application number: CN 00253322
Authority: CN
Inventors: 李寅; 孙敬华; 贾福成; 王学才
Original assignee: Harbin Jiuzhou Electric Co ltd
Current assignee: Harbin Jiuzhou Electric Co ltd
Priority date: 2000-12-05
Filing date: 2000-12-05
Publication date: 2002-06-05
Anticipated expiration: 2010-12-05

Abstract

The utility model relates to a HF switch electric source soft starting device to prevent the damage to a rectifier bridge caused by a circuit fault and short behind the rectifier bridge and further prevents the fault enlarging of an after-grade circuit. The utility model consists of a major controlled silicon rectification circuit, a starting rectification circuit, an inverter circuit and an assistant rectification circuit. The device is characterized in that the starting rectification circuit made by a rectifier diode carries through rectification slowly and connects the inverter circuit. One secondary coil of a transformer B1 generates alternating current voltage and controls the conduction of the controlled silicon SCR1, SCR2 and SCR3 through rectification.

Description

The high frequency switch power soft starting device

The utility model belongs to the starting drive of high frequency switch power

As everyone knows, in rectification circuit,,, between rectifier bridge and electric capacity, usually add the one-level soft starting circuit in order to prevent damage to rectifier bridge because the existence of filter capacitor makes rectifier bridge flow through very big electric current at powered on moment.But existing method mainly contains two kinds: a kind of is to add thermistor, as the RT1 among Fig. 1.Another kind method is to add the relay that is parallel with high-power resistance, as shown in Figure 2, and the timer V5 that this relay is made up of a RC again, R9, C6 control.Though these methods have very prevented the impact of powered on moment to rectifier bridge effectively, when operate as normal, if fault has taken place back one-level circuit, as short circuit, usually cause excessive electric current, this will burn rectifier bridge, cause directly entering of alternating current, and then caused more components from being damaged.

The utility model purpose is to design a kind of high frequency switch power soft starting device, prevent when the later circuit of rectifier bridge break down and during short circuit to the damage of rectifier bridge, and and then prevent that the fault of back one-level circuit from enlarging.

In order to achieve the above object, the another kind of method of prior art is improved, that is: relay is changed into controllable silicon, changing indirect timer and fault FEEDBACK CONTROL into by simple RC timer control.Be by the silicon controlled main rectifier rectification circuit, start rectification circuit, inverter circuit and auxiliary rectifier circuit are formed, it is characterized in that: rectification diode D1, D2, D3, D4, D5, D6, resistance R 4, R5, the startup rectification circuit that R6 forms carries out slow rectification, start rectification circuit output end and connect capacitor C 1 two ends, connect the field effect transistor V1 that controls indirectly by outer timer and controller etc., V2, V3, V4 and capacitor C 2, the inverter circuit that transformer B1 forms, when capacitor C 1 two ends have reached the magnitude of voltage of a certain requirement, inverter circuit is started working, and the secondary coil of transformer B1 produces alternating voltage, and by resistance R 7, diode D7, capacitor C 3, source of stable pressure W1, resistance R 1, R2, the rectification circuit that R3 forms, its output is through resistance R 1, R2, R3 connects controllable silicon SCR 1, SCR2, the control utmost point of SCR3, control controllable silicon SCR 1, SCR2, SCR3 and rectification diode D1, D2, the conducting of the silicon controlled main rectifier rectification circuit that D3 forms, the silicon controlled main rectifier rectification circuit is by field effect transistor V1, V2, V3, V4, capacitor C 2, transformer B1 forms the power supply of inverter circuit.

Fig. 1 is existing thermistor-type soft starting circuit figure;

Fig. 2 is existing relay system soft starting circuit figure;

Fig. 3 is the utility model embodiment circuit diagram

As shown in Figure 3, by controllable silicon SCR 1, SCR2, SCR3, resistance R 1, R2, R3, R4, R5, R6, rectification diode D4, D5, D6, source of stable pressure W1, capacitor C 3, D7, resistance R 7 has been formed this soft starting circuit.When powering on beginning, three-phase alternating current is at first through rectification diode D1, D2, D3, D4, D5, D6, resistance R 4, R5, the rectification circuit that R6 forms carries out slow rectification, when capacitor C 1 two ends have reached the magnitude of voltage of a certain requirement, field effect transistor V1 by indirect controls such as outer timers, V2, V3, V4, with capacitor C 2, the inverter circuit that transformer B1 forms is started working, thereby make the secondary coil of transformer B1 produce alternating voltage, and by resistance R 7, rectification diode D7, capacitor C 3, source of stable pressure W1, resistance R 1, R2, the rectification circuit that R3 forms goes to control controllable silicon SCR 1, SCR2, the SCR3 conducting, the rectification task of this moment will be fully by rectification diode D1, D2, D3, controllable silicon SCR 1, SCR2, SCR3 finishes.If back one-level circuit breaks down, be short-circuited as field effect transistor V1 and V2 or field effect transistor V3 and V4, and field effect transistor V1, V2, V3, V4 is controlled when closing, and main transformer B1 will quit work, each secondary coil of B1 also will stop output, thereby make by resistance R 7 rectification diode D7, capacitor C 3, source of stable pressure W1, the rectification circuit that resistance R 1, R2, R3 form has just lost to controllable silicon SCR 1 SCR2, the control of SCR3, thereby closed input rectification circuit, and then prevented further spreading of fault.

The utility model is not only applicable to the high-power high-frequency switch power supply, is applicable in other equipment that needs rectification to also have all kinds of household electrical appliance simultaneously yet.

Claims

1. high frequency switch power soft starting device, be by the silicon controlled main rectifier rectification circuit, start rectification circuit, inverter circuit and auxiliary rectifier circuit are formed, and it is characterized in that: rectification diode D1, D2, D3, D4, D5, D6, resistance R 4, R5, the startup rectification circuit that R6 forms carries out slow rectification, starts rectification circuit output end and connects capacitor C 1 two ends, the field effect transistor V1 that connection is controlled indirectly by outer timer and controller etc., V2, V3, V4, with capacitor C 2, the inverter circuit that transformer B1 forms, when capacitor C 1 two ends had reached the magnitude of voltage of a certain requirement, inverter circuit was started working, the secondary coil of transformer B1 produces alternating voltage, and by resistance R 7, diode D7, capacitor C 3, source of stable pressure W1, resistance R 1, R2, the rectification circuit that R3 forms, its output is through resistance R 1, R2, R3 connects controllable silicon SCR 1, SCR2, the control utmost point of SCR3, control controllable silicon SCR 1, SCR2, SCR3 and rectification diode D1, D2, the conducting of the silicon controlled main rectifier rectification circuit that D3 forms, the silicon controlled main rectifier rectification circuit is by field effect transistor V1, V2, V3, V4, capacitor C 2, transformer B1 forms the power supply of inverter circuit.