CN2476093Y

CN2476093Y - Energy-saving device for AC contactor

Info

Publication number: CN2476093Y
Application number: CN 01221861
Authority: CN
Inventors: 滕国彤
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-29
Filing date: 2001-04-29
Publication date: 2002-02-06
Anticipated expiration: 2011-04-29

Abstract

The utility model discloses an energy saving device, especially an energy saving device which can be matched and used with an AC contactor. The shape of the energy saving device consists of an insulation shell, a connection wire terminal and connection wire pins. The circuit layout is as follows: a capacitance C1, a resistance R1 and a silicon controlled rectifier CT1 are in parallel connection; a diode D1 and a contactor coil L are in parallel connection; a diode D2, a resistance R2, a resistance R3 and a capacitance C2 are in parallel connection and are mutually connected in series on the A end of the power supply and the G end of the silicon controlled rectifier CT1. The silicon controlled rectifier of the utility model is designed to disconnect the circuit after a delay, thus the starting and operation integration can be realized without connecting auxiliary contacts. By using capacitor depressing voltage, the power factor can be improved. The utility model is also provided with a plurality of advantages, such as small volume, lower cost, reliable working, convenient installation, etc.

Description

The energy-saving appliance of A.C. contactor

The utility model relates to a kind of energy saver, particularly with the matching used energy-saving appliance of A.C. contactor.

The A.C. contactor that uses in industrial all electric distributions at present generally adopts the alternating current operation, have that noise is big, power consumption is many, many shortcomings such as coil and iron core temperature height, shortcoming at A.C. contactor, also there is the power-saving technology of some A.C. contactors to occur, though these energy-saving appliances can be realized the DC operation of A.C. contactor, shortcomings such as but it also exists wiring numerous and diverse, and used element disperses, and reliability is low; Other has and adopts the transformer step-down, and to the product of contactor coil power supply, its shortcoming is that volume is big, power consumption big and then rate of failure increase etc. after the rectification.

The purpose of this utility model is, for remedying the deficiencies in the prior art, provides a kind of starting operation integrated, has that volume is little, cost is low, power consumption is little, an energy-saving appliance of reliable operation and A.C. contactor easy for installation.

Technical solution of the present utility model is: the energy-saving appliance of A.C. contactor is made up of insulation crust 1, wire-pressed terminal 2, wiring pin 3 and circuit board etc., wire-pressed terminal 2 is circuit a end, wiring pin 3 is respectively the b end and the c end of circuit, circuit board is contained in the energy-saving appliance insulation crust 1, insulation crust 1 mutual snapping is an one, capacitor C on the circuit board ₁, resistance R ₁, controllable silicon CT ₁Three elements also connect diode D ₁L is in parallel with contactor coil, diode D ₂, resistance R ₂And resistance R ₃Shunt capacitance C ₂, series connection is at the G end of power supply a end with controllable silicon CT mutually, and its circuit theory is:

At the positive half cycle (the positive b of a is negative) of energized, electric current is through a → D ₂→ R ₂→ C ₂/ R ₃→ GK → L → b forms the loop, to capacitor C ₂T is worked as in charging ₁Constantly, voltage rises to U ₁During point, the charging current of generation makes the controllable silicon triggering and conducting, and controllable silicon conduction terminal voltage is near OV, and power supply is powered to contactor coil.Capacitor C ₂Pass through R ₃Slowly discharge.Because charge constant is far smaller than discharge time constant, so controllable silicon is at the phase shifting angle increase of the positive half cycle of the next one, i.e. t ₂U constantly ₂Greater than t ₁U constantly ₁, by that analogy.C ₂On voltage through tens all after dates (time was less than 1 second), be charged to the crest voltage that is bordering on the power supply positive half wave, positive half cycle is reduced greatly by the trigger current of controllable silicon gate pole.So at t _nConstantly, controllable silicon also is in cut-off state at positive half cycle.And t ₁To t _nConstantly, controllable silicon conduction period power supply is supplied with the electrical power that contactor coil produced is enough to make the contactor adhesive.At this moment, circuit has formed D ₁Rectification, C ₁The circuit of current limliting, L filtering provides direct current to keep its attracting state to contactor coil L.

Simultaneously, the positive half cycle at power supply still passes through above-mentioned charging circuit to C ₂Charging is with building-out capacitor C ₂Pass through resistance R ₃The caused voltage drop of discharging, but charging current is very little, and deficiency is so that the controllable silicon triggering and conducting.

R ₁Be capacitor C ₁Discharge resistance.Behind power cut-off, make C ₁Repid discharge is in order to avoid jeopardize the maintainer.R ₂Current-limiting resistance for charge circuit.

The key of this circuit is rationally to determine R ₂, R ₃, C ₂Value, the silicon controlled trigger current is all reduced gradually at the positive half cycle of each power supply, until less than the silicon controlled trigger current, reach the purpose that makes the controllable silicon time delayed turn-off.

The utility model can not connect the switching that auxiliary contact can realize starting an operation owing to designed the controllable silicon time delayed turn-off circuit, so that it can start an operation is integrated; Owing to adopt capacitance decompression, exportable reactive power improves the line power factor; Because this product design is a three-terminal element, can directly be fixed on the binding post of contactor coil, so install very convenient.

Following table is the table of comparisons of CT20 series contactor AC-DC operational factor:

The A.C. contactor model	Ac operation		DC operation		Power savings
	Ac operation		DC operation		Power savings		Meritorious (W)	Idle (Var)	Meritorious (W)	Idle (Var)	Save meritorious (W)	Save idle (Var)
	CJ20-160	34	78.5	1.5	30	30	Meritorious (W)	Idle (Var)	Meritorious (W)	Idle (Var)	Save meritorious (W)	Save idle (Var)	108.5
CJ20-400	CJ20-160	34	78.5	1.5	30	30	66	140.3	2.0	60	60	200	108.5
CJ20-400	CJ20-630	118	220.5	2.3	60	115	66	140.3	2.0	60	60	200	280

The utility model is provided by the following drawings:

Fig. 1 is an energy-saving appliance profile schematic diagram

Fig. 2 is the economizer circuit schematic diagram

Fig. 3 is energy-saving appliance controllable silicon CT ₁, the voltage oscillogram between AK

Fig. 4 is the wiring schematic diagram of original contactor coil L

Fig. 5 is the wiring schematic diagram of the contactor of employing energy-saving appliance

Filter line ripple is with partly showing controllable silicon conduction period among Fig. 3.

L among Fig. 4, Fig. 5 ₁, L ₂The expression circuit.

Components and parts of the present utility model are selected:

D ₁: be subjected to supply voltage peak value and C ₁Filled the crest voltage effect.Reverse voltage is got 820V (2A).

C ₁: C ₁Capacity should make contactor be in reliable attracting state, and current ratio is smaller when exchanging attracting state.Select terylen electric capacity, withstand voltage 400V or 630V (sight line circle voltage and decide).

C ₂: C ₂Choice of capacity should make the time of contactor starting enough short, and power is enough big, in order to avoid occur inoperative or long possibility of burning coil of starting time.Select 4.7uF/400V.

CT ₁: select CR3EM or CR6Am, decide on the contactor of adapted.

Model design of the present utility model: can adopt JN-/ range of models.

Example: JN20-160/380

The JN-energy-saving appliance

20-160: supporting with CJ20-160 type contactor.

380: be applicable to coil voltage 380V.

Claims

1, the energy-saving appliance of A.C. contactor is made up of insulation crust, wire-pressed terminal, wiring pin, circuit board etc., it is characterized in that: capacitor C on the circuit board ₁, resistance R ₁, controllable silicon CT ₁Three elements also connect diode D ₁L is in parallel with contactor coil, diode D ₂, resistance R ₁And resistance P ₃Shunt capacitance C ₂Series connection is in the G end of power supply a end with controllable silicon CT, resistance R mutually ₂, R ₃, capacitor C ₂But reasonable value decision controllable silicon time delayed turn-off.

2, the energy-saving appliance of interchange contact according to claim 1, its feature also is: binding post is circuit a end, and the wiring pin is respectively the b end and the c end of circuit, and circuit board is contained in the energy-saving appliance insulation crust, and the mutual snapping of insulation crust is an one.