CN2148391Y

CN2148391Y - Power-saving contactor

Info

Publication number: CN2148391Y
Application number: CN 93236467
Authority: CN
Inventors: 贺东梅
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-12
Filing date: 1993-03-12
Publication date: 1993-12-01
Anticipated expiration: 2003-03-12

Abstract

The utility model discloses an electricity saving contactor. The electricity saving contactor is composed of an electromagnet, a permanent magnet and a contact head action control device. The electricity saving contactor is characterized in that a breaking actuating mechanism of the electricity saving contactor is composed of energy-storage capacitors which are connected to two ends of a suction coil of the electromagnet, and a switch device which uses an electric signal to trigger the energy-storage capacitors to discharge. The switch device is a unidirectional controlled silicon controller which is connected with the output end of a pulse signal source of a transistor, or a relay which is used for controlling. Two crystal triodes with a same type are coupled and connected to form the pulse signal source of the transistor.

Description

Power-saving contactor

The utility model belongs to a kind of economize on electricity contactor, especially a kind of improvement of the electromagnetic contactor with permanent magnet.

The electromagnetic type contactor of Shi Yonging now, the contactor sucking coil is switched on for a long time could the holding armature adhesive and drive main and auxiliary contact closure and keep operate as normal.Therefore, power consumption is very considerable.For the purpose of economizing on electricity, the electromagnetic contactor scheme (CN87207644U, on December 2nd, 1987 was announced) that adds permanent magnet was once arranged, this scheme is an energy storage capacitor in parallel with sucking coil in control circuit.When the circuit connection, Contactor Starting, moment makes the main contact adhesive by electromagnetism and two kinds of active forces of permanent magnetism, makes the capacitor charging simultaneously; Electromagnetic circuit disconnects subsequently, and the capacitor energy storage leans on permanent magnetism power to keep the holding course of contact separately.When the circuit dead electricity, capacitor discharges through sucking coil, produces reverse magnetic potential, makes the contact disjunction.The weak point of this scheme is: the long-term energy storage of capacitor, and volume is big, and capacity is big, and the time that discharges and recharges is long, the dropping resistor load is big, and therefore in start-up course, the control circuit power consumption is still more, and when outage, the arcing phenomenon is obvious, influences contactor useful life and reliability.

The purpose of this utility model is that above-mentioned permanent magnet energy-saving contactor scheme is improved, to compensate its defect.

The technical solution of the utility model be one as shown in drawings by electromagnet, the economize on electricity contactor that permanent magnet and contact motion control device constitute, be connected to energy storage capacitor (C4) and discharge control switch device thereof at the two ends of electromagnet sucking coil and form the actuator of this main noddle on contactor disjunction, it is characterized in that, described discharge control switch device is an electromagentic switching apparatus, the driving command of this switch is taken from a transistor pulse signal generator, this pulse signal generator is by two same type triode (BG1, BG2) lotus root is closed to connect and forms, and its version is:

(1) by rectifier diode (D1, D2, D3, D4) and filtering capacitor (C2) and form described pulse signal generator low-voltage supply with the resistance (R1) of input capacitor (C1) impedance matching;

(2) link to each other with triode (BG1) base stage by the intermediate node of described low-voltage supply output through divider resistance (R1 and R2);

(3) by described low-voltage supply output, pass through isolating diode (D5) again, divide three tunnel: one tunnel intermediate node to lead to the base stage of triode (BG1) collector electrode and triode (BG2) respectively from its negative pole node through divider resistance (R4 and R6), another road connects the collector electrode of triode (BG2) through described electromagentic switching apparatus, Third Road and an electrolytic condenser (C3) positive pole join, and the negative pole of capacitor (C3) and power supply ground end join;

(4) triode (BG1 and BG2) emitter-base bandgap grading joins through shared resistance (R5) and power supply ground end.

The electromagentic switching apparatus of indication can be the one-way SCR (CRT) by pulse transformer (T) control in the above-mentioned embodiment, also can select a control relay (J) for use.

With the exception of this, also can be in the bypass of described electromagentic switching apparatus, and connect a manually test disjunction button (TS).

In conjunction with the accompanying drawings " adhesive " of the utility model embodiment and " disjunction " two course of action are described respectively more below:

A, adhesive action

When pressing start button (QA) or contactor (CJ) automatically normally opened contact be closed, from power supply one end → contact point (CJ) coil → diode (D10) → contactor (CJ) normally-closed contact → diode (D9) → change over switch → start button (QA) → disjunction button (TA) → thermal relay (RJ) → fuse (RD) → power supply other end, circuit is connected, add by contactor (CJ) coil generation magnetic potential and permanent magnet magnetic barrier layer, make the main noddle on contactor adhesive, main circuit is connected and is carried out; Contactor (CJ) normally-closed contact disjunction simultaneously, contactor (CJ) coil power supply interrupts, and main contact keeps the sticking state by permanent magnetic potential; Contactor (CJ) normally opened contact closure, contactor disjunction actuating mechanism circuit is maintained, electric pathway self-capacitance (C1) → rectifier diode (D1-D4) → filter capacitor (C2), (C2) Capacity Selection was avoided nought state, resistance R 1 is complementary with Xc, the electric current of the resistance R of flowing through 1 is not less than 10mA, through isolating diode (D5) electric capacity (C3) is charged again, like this, obtain little charge constant and big discharge time constant, form the preferred conducting of triode BG1, triode BG2 ends, and this moment, the electric energy of circuitry consumes was a contactor sticking consumed energy.

B, disjunction action

When pressing disjunction button (TA), the control circuit dead electricity, triode BG1 ends, and leans on the energy storage of capacitor C 3 to make triode BG2 saturation conduction, and at this moment two kinds of selections can be arranged:

If 1. the BG2 collector electrode connects pulse transformer (T), promptly produce a trigger impulse, make one-way SCR (CRT) conducting, the 311V that capacitor (C4) upward forms, 517V voltage are to contactor CJ coil discharge, produce the magnetic potential opposite with permanent magnetic potential, under the effect of reaction tension spring, make the main noddle on contactor disjunction;

If 2. the BG2 collector electrode connects control relay (J) coil, then when the BG2 conducting, relay (J) normally opened contact closure once, 311V on the capacitor (C4), 517V voltage are to contactor (CJ) coil discharge, produce and the reverse magnetic potential of permanent magnetic potential, contactor makes the main contact disjunction under the effect of reaction tension spring.

Advantage of the present utility model is with good effect: it is compared with original technology, new storage capacitor control circuit structure, and when the normally closed outage of contactor CJ, arcing Phenomenon obviously reduces, because contactor CJ coil can release energy to electric capacity (C4), the electric capacity both end voltage can not be suddenlyd change and be made coil energy turn to electric capacity; Moreover, contactor disjunction actuating mechanism controls circuit of the present utility model does not need long-term energy storage, because the circuit dead electricity needs the contactor must instant-free, so, electric capacity only need satisfy the requirement of short time energy storage, thereby not only reduced the specification requirement to energy-storage capacitor, and made breaking course more quick reliable; Secondly, the utility model control circuit low-voltage dc power supply is with capacitance decompression, resistance step-down situation in original technology, obviously energy-conservation, Contactor Starting moment power consumption 8W of the present utility model, the holding course power consumption only is 0.14W, and there is not idle component, and the startup moment power consumption 140VA of original technology, idle component 22VA in the holding course, active power 9W; At last, the utility model control circuit compact conformation, volume is little, can be loaded in any existing contactor framework.

Claims

1, a kind of economize on electricity contactor, by electromagnet, permanent magnet and contact motion control device constitute, be connected to energy storage capacitor (C4) and discharge control switch device thereof at the two ends of electromagnet sucking coil and form the actuator of main noddle on contactor disjunction, of the present utility model being characterised in that: the discharge control switch device of described energy storage capacitor (C4) is an electromagentic switching apparatus, the driving command of this switching device is taken from a transistor pulse signal generator, this pulse signal generator is by two same type triode (BG1, BG2) lotus root is closed to connect and forms, and its concrete structure is:

A, form described pulse signal generator low-voltage supply by rectifier diode (D1, D2, D3, D4) and filter stream capacitor (C2) and with the resistance (R1) of input capacitor (C1) impedance matching;

B, link to each other with triode (BG1) base stage by described low-voltage supply output intermediate node through divider resistance (R1 and R2);

C, by described low-voltage supply output, pass through isolating diode (D5) again, divide three tunnel: one tunnel intermediate node to lead to the base stage of the collector electrode and the triode (BG2) of triode (BG1) respectively from its negative pole node through divider resistance (R4 and R6), another road connects the collector electrode of triode (BG2) through described electromagentic switching apparatus, Third Road, join with an electrolytic condenser (C3) positive pole, the negative pole of capacitor (C3) and power supply ground end join;

D, triode (BG1 and BG2) and emitter-base bandgap grading join through shared resistance (R5) and power supply ground end.

2, economize on electricity contactor according to claim 1 is characterized in that, described electromagentic switching apparatus is the one-way SCR (CRT) by pulse transformer (T) control.

3, economize on electricity contactor according to claim 1 is characterized in that, described electromagentic switching apparatus is a control electrical relay (J).