CN202549726U

CN202549726U - Combined instruction switch circuit for AC contactor

Info

Publication number: CN202549726U
Application number: CN2011204484674U
Authority: CN
Inventors: 李杰正; 李立志; 严亚飞
Original assignee: Shanghai Shengtao Intelligent Technology Co Ltd
Current assignee: Wenzhou Shengtao Science & Technology Co., Ltd.
Priority date: 2011-11-14
Filing date: 2011-11-14
Publication date: 2012-11-21
Anticipated expiration: 2021-11-14

Abstract

The utility model discloses a combined instruction switch circuit for an AC contactor. An alternating voltage is input, rectified and then output to a direct current output circuit. Direct current is output to a contactor solenoid. A single-throw instruction switch K1 is connected behind the direct current output circuit in parallel, and after the circuit is started, the K1 stays in a switch-off state, and heavy current is output by the direct current to enable the contactor solenoid to be closed. After a set time is delayed via a time control circuit, the circuit is triggered to be started, an alternating current control circuit is controlled for input, and the input alternating voltage is reduced, thereby reducing the output direct current. The advantages of the circuit are that the single-throw switch is adopted to serve as a control instruction without auxiliary contacts for self-protection, and the simplest wiring forms instruction control of an AC contactor; the circuit enables multiple electricity not to be started and enables coils not to be burnt under low voltage; and the circuit has the characteristics of energy conservation, low temperature of coils, prolonged service life, improved power property and low noise.

Description

A.C. contactor combined command switching circuit

Technical field

The utility model relates to a kind of A.C. contactor combined command switching circuit.

Background technology

A.C. contactor is applied to the startup at power terminal and stops, like various lathes, disintegrating machine, mixer.Safety in order to ensure production process; The startup of its power can not be random, must adopt the control with the single-minded instruction of safeguard function, and armature possibly discharge when A.C. contactor ran on low-voltage; This moment, coil impedance reduced, and the electric current that flows through coil can be to burn out coil even to cause fire.Existing startup, self-insurance, the mode of stopping are exactly the use standard of working out in order to reach above-mentioned requirements.

The control of A.C. contactor is adopted startup, self-insurance, is stopped mode; Wherein self-insurance is to adopt the auxiliary contact self-insurance, and this pattern can prevent that telegram in reply from not having the instruction startup and not adhesive of low-voltage induced coil burns out, but complicated circuit is as shown in Figure 1.

The utility model content

The utility model technical problem to be solved be to provide a kind of with single-throw switch as control command, not auxiliary contact self-insurance constitutes the A.C. contactor combined command switching circuit of commands for controlling with the simplest wiring.

In order to solve above technical problem, the utility model provides a kind of A.C. contactor combined command switching circuit, input ac voltage; Export dc output circuit after the rectification to, output DC flow to the contactor solenoid, in dc output circuit back and connect one and singly throw command switch K1; Behind the circuit start, K1 is in off-state, and direct current is exported big electric current and made the adhesive of contactor solenoid; Behind time control circuit delay setting-up time, circuits for triggering start, control input AC control circuit; Reduce AC-input voltage, thereby reduce average anode current.

Said input AC control circuit is serial connection one controllable silicon in exchanging the input bridge rectifier, and controllable silicon also is connected to R1, the C1 circuit of series connection.

Said circuits for triggering are to connect an optically coupled circuit IC at the SCR control utmost point, optically coupled circuit IC with the time control circuit be connected.

Control circuit is to be serially connected with R4, R5 bleeder circuit at the back at dc output circuit when said; R5 also is connected to charging capacitor C3 and voltage-stabiliser tube DW1; C3, DW1 are connected with optically coupled circuit diode IC1 through resistance R 3, and diode D5 of optically coupled circuit diode IC1 negative pole serial connection is connected with dc output circuit.

The superior effect of the utility model is:

1) as control command, not auxiliary contact self-insurance constitutes the commands for controlling of A.C. contactor with the simplest wiring to the utility model with single-throw switch, has telegram in reply equally and does not start with low-voltage and do not burn the coil function;

2) energy-conservation, coil temperature is low, lengthens the life, and dynamic characteristics is improved, and noise is low.

Description of drawings

Fig. 1 is the winding diagram of existing switch;

Fig. 2 is the switch winding diagram of the utility model;

Fig. 3 is the basic circuit diagram of the utility model.

Embodiment

See also shown in the accompanying drawing, the utility model is done further to describe.

As shown in Figures 2 and 3, the utility model provides a kind of A.C. contactor combined command switching circuit, input ac voltage; Export dc output circuit after the rectification to, output DC flow to the contactor solenoid, in dc output circuit back and connect one and singly throw command switch K1; Behind the circuit start, K1 is in off-state, and direct current is exported big electric current and made the adhesive of contactor solenoid; Behind time control circuit delay setting-up time, circuits for triggering start, control input AC control circuit; Reduce AC-input voltage, thereby reduce average anode current.

When controllable silicon BT1 conducting, dc output circuit A1, A2 provides big electric current to coil, when controllable silicon BT1 closes; Through C1, the R1 current limliting provides little electric current, and big or small current ratio 30-40 doubly; Wherein K1 is the switch that instruction is controlled in DC side, works as power connection, when K1 breaks off; Ab two point voltages are the full-bridge value of power supply, divide to be depressed into the c point through the DW1 voltage stabilizing, and C3 charges to stationary value; When K1 was closed, the C3 electric power storage can be through R3, IC1, D5, K1 discharge, and effectively be exactly the service time of controllable silicon BT1 discharge time.If power interruptions is sent a telegram in reply again, because of K1 is in make position, ab point-to-point transmission voltage is zero, and IC1 does not trigger, not conducting of BT1.Have only little electric current to pass through in the loop, this little electric current cannot drive the contactor adhesive, has only as K1 and breaks off when connecting again, and controllable silicon just can instantaneous conducting and make the contactor adhesive.Therefore the switch of the utility model not only has to hand over and changes straight function and also have the command switch function, reaches the purpose of exclusive command control.

Claims

1. A.C. contactor combined command switching circuit, it is characterized in that: input ac voltage exports dc output circuit to after the rectification; Output DC flow to the contactor solenoid, in dc output circuit back and connect one and singly throw command switch K1, behind the circuit start; Singly throw command switch K1 and be in off-state, direct current is exported big electric current and is made the adhesive of contactor solenoid, behind time control circuit delay setting-up time; Circuits for triggering start; Control input AC control circuit reduces AC-input voltage, thereby reduces average anode current.

2. A.C. contactor power module circuitry according to claim 1 is characterized in that: said input AC control circuit is serial connection one controllable silicon in exchanging the input bridge rectifier, and controllable silicon also is connected to resistance R 1, capacitor C 1 circuit of series connection.

3. A.C. contactor power module circuitry according to claim 1 is characterized in that: said circuits for triggering are to connect an optically coupled circuit IC at the SCR control utmost point, optically coupled circuit IC with the time control circuit be connected.

4. A.C. contactor power module circuitry according to claim 1; It is characterized in that: control circuit is to be serially connected with resistance R 4, resistance R 5 bleeder circuits at the back at dc output circuit when said; Resistance R 5 also is connected to charging capacitor C3 and voltage-stabiliser tube DW1; Charging capacitor C3, voltage-stabiliser tube DW1 are connected with optically coupled circuit diode IC1 through resistance R 3, and diode D5 of optically coupled circuit diode IC1 negative pole serial connection is connected with dc output circuit.