CN2338913Y

CN2338913Y - Electronic starter

Info

Publication number: CN2338913Y
Application number: CN 98232528
Authority: CN
Inventors: 陈明新
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-03
Filing date: 1998-03-03
Publication date: 1999-09-15
Anticipated expiration: 2008-03-03

Abstract

The utility model relates to an electronic starter which is used for a single phase machine. The utility model is composed of an induction transformer B, a bidirectional thyristor KG, a rectification filter circuit which is composed of a rectifier bridge D and a capacitor C, and a current-limiting resistor R. Because the utility model adopts an induction transformer and a bidirectional thyristor structure, the utility model has the advantages of simple structure, sensitive induction, stable operation, and safe operation. The utility model can be used for various induction single phase machines which are one-way operated, the starting windings of the single phase machines need disconnecting after the single phase machines are operated, and the utility model is especially suitable for starting motors of refrigerators.

Description

Electronic starter

The utility model belongs to the electric motor starting servicing unit, and specifically it is a kind of electronic starter that is used for single-phase motor.

At present, be similar to freezer compressor and mainly adopt Weight type starter and PTC starter (temperature-sensitive element) with motor.This two classes starter when line voltage is unstable, can cause damage to motor in actual use.In order to address this problem, application number is to have introduced a kind of refrigerator electronic starter in China's utility application prospectus of 91221356.6, it mainly is made up of power circuit, rectification circuit and direct current relay, startup winding by direct current relay control motor, utilize the charge-discharge characteristic of electric capacity, guaranteed the start-up time of electric motor starting winding, special in the lower area of voltage, avoided the long-time energising of motor operation winding and danger that motor can not normally start so that burn out.But this starter makes to exist the mechanical type electric contact in the circuit owing to adopted relay-set, makes that the circuit long-term work is dangerous.

The purpose of this utility model provides a kind of electronic starter simple in structure that does not have the full electronic of mechanical contact, to overcome the deficiencies in the prior art.

Accompanying drawing 1 is an electrical schematic diagram of the present utility model.Below in conjunction with accompanying drawing 1 concrete structure of the present utility model is described.

The purpose of this utility model can reach by following structure. The utility model has a pair of city electric connection terminal (1) and (2), city's electric connection terminal (1) joins city's electric connection terminal with motor common terminal (3) (2) move winding connection end (4) with motor after being connected in series with the primary coil of sensor transformer B and join the city Electric connection terminal (2) also is connected in series rear and electric motor starting winding connection end (5) phase with a bidirectional triode thyristor KG Connect, the secondary coil of sensor transformer B and a current rectifying and wave filtering circuit that is made of rectifier bridge D and capacitor C join, The output of current rectifying and wave filtering circuit joins with the control utmost point and the negative electrode of bidirectional triode thyristor KG respectively. Inserting like this When using in the circuit, because the starting current of motor is bigger than normal operating current, thereby starting current that ought be bigger During by sensor transformer B, the secondary of sensor transformer B will induce higher voltage, and this voltage is through whole Trigger the bidirectional triode thyristor conducting after the stream filtering, make the startup winding normal operation of motor, behind electric motor starting because The electric current that runs well reduces, and makes sensor transformer B secondary induction voltage drop to not triggering bidirectional triode thyristor The program of KG, bidirectional triode thyristor KG is blocked, and the startup winding of motor is disconnected, and motor just enters Normal running. When reality is used, according to the power of motor, only need to change the related data of sensor transformer B, Select corresponding bidirectional triode thyristor KG to get final product.

In order to make the utility model adapt to various working environments, between the control utmost point of the output of the current rectifying and wave filtering circuit that constitutes by transformer B and capacitor C of the present utility model and controllable silicon KG, be serially connected with a current-limiting resistance R.When reality is used, can adjust start-up parameter by regulating resistance R like this according to the concrete condition of motor.

The utility model has been owing to adopted sensor transformer and bidirectional triode thyristor structure, makes to the utlity model has simple in structure, induction sensitivity, working stability, characteristics safe in utilization, thereby reached the purpose of this utility model.

The utility model can be used for needing after the various runnings to disconnect the induction monophase machine of the unidirectional running that starts winding, is specially adapted to the startup of refrigerator motor.

Claims

1, a kind of electronic starter, feature of the present utility model is that a pair of city electric connection terminal (1) and (2) are arranged, city's electric connection terminal (1) joins with motor common terminal (3), city's electric connection terminal (2) is connected in series the back and joins with motor operation winding connection end (4) with the primary coil of sensor transformer B, city's electric connection terminal (2) also is connected in series the back and joins with electric motor starting winding connection end (5) with a bidirectional triode thyristor KG, the secondary coil of sensor transformer B and a current rectifying and wave filtering circuit that is made of rectifier bridge D and capacitor C join, and the output of current rectifying and wave filtering circuit joins with the control utmost point and the negative electrode of bidirectional triode thyristor KG respectively.

2,, it is characterized in that between the control utmost point of the output of the current rectifying and wave filtering circuit that constitutes by transformer B and capacitor C and controllable silicon KG, being serially connected with a current-limiting resistance R according to the described electronic starter of claim 1.