CN2275755Y

CN2275755Y - Energy-saving electromagnet controller

Info

Publication number: CN2275755Y
Application number: CN 96247900
Authority: CN
Inventors: 王敬茂
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-12-09
Filing date: 1996-12-09
Publication date: 1998-03-04
Anticipated expiration: 2006-12-09

Abstract

The utility model discloses an energy-saving electromagnet controller, having the advantages of high reliability, strong interference immunity and good producing technology performance. An integrating circuit is adopted to control trigger pulse. An isolated amplifier isolate the integrating circuit and a thyristor. The voltage stabilizing link is canceled to enhance the adaptability. An auxiliary rectifier tube is added to increase the reversal voltage bearing performance of the thyristor. The utility model comprises a non-voltage stabilizing power supply circuit, a time control circuit, a trigger circuit, a starting rectifying circuit and a hold circuit.

Description

The energy-saving electromagnetic rail controller

The utility model is a kind of high voltage startup, and the control circuit of low pressure maintenance energy-saving electromagnet special use belongs to the electrical application technology field.

China's utility model patent, notification number is CN105028A, discloses a kind of control circuit of energy-saving electromagnet, is to keep the loop to constitute by high voltage startup loop and low pressure.The core of its circuits for triggering is differential circuits of being made up of electric capacity and resistance, directly triggers the trigger electrode of thyristor, and when energized, differential circuit produces a spike can make thyristor moment conducting, electromagnetic actuation.After electric capacity was full of electricity, trigger impulse disappeared, and thyristor turn-offs.Simultaneously, low pressure keeps loop works to keep the adhesive of electromagnet.This duplicate supply mode is powered and not only can be made the reliable adhesive of electromagnet, and saves a large amount of energy.But foregoing circuit has the following disadvantages:

1. trigger pulse width is difficult for debugging, and the circuits for triggering carrying load ability is poor.

In foregoing circuit, the output of differential circuit directly is connected to the trigger electrode of thyristor.Just caused because of the difference of thyristor GK junction resistance and the difference of trigger current, and made effective trigger pulse width difference.This gives debugging work for coming very big difficulty.

2. the easy temperature influence of trigger pulse width

Variation of temperature can make the trigger current of thyristor change.Change with regard to the effective work width that causes trigger impulse.Therefore, variations in temperature can cause the instability of thyristor ON time.Influence the reliability of work of electromagnet.

3. the differential circuit interference free performance is poor

Because the size of the output signal of differential circuit is directly proportional with the rate of change of input signal, so interference signals such as high frequency spike in the electrical network and surge voltage easily cause the false triggering of thyristor.

The utility model purpose is the deficiency that exists at above-mentioned energy-saving electromagnet control circuit, discloses a kind of more practically, has the reliability height, the energy-saving electromagnet control circuit of strong interference immunity.

Its improvement part is as follows:

1: the width of controlling trigger impulse with integrating circuit

Because impulse disturbances is very little to the output influence of integrating circuit, so just improved the anti-interference of circuit greatly.

2: integrating circuit and thyristor are isolated with isolated amplifier

Since all non-constant of load capacity of differential circuit and integrating circuit, and the trigger current of thyristor is not of uniform size.Between adds an amplifier, can make integration circuit time constant not be subjected to the influence of thyristor.And time control precision and carrying load ability have been improved.

3: cancellation voltage stabilizing link, improve adaptive capacity.

In patent of the same type in the past, certain for guaranteeing the magnet excitation single pulse width, a voltage stabilizing link is arranged in control circuit.But electromagnet suction was bigger when voltage was high, and the short time just can put in place in adhesive.And voltage when low electromagnet suction less, armature adhesive needed time that puts in place is then longer.If trigger pulse width is fixed, also can reliably working (standard code) when the low-voltage in order to guarantee electromagnet, trigger pulse width must enough length.When voltage was normal or higher, long strong excitation time not only caused unnecessary waste like this, also made the electromagnet coil temperature too high, influenced the raising of operating frequency.As cancel the voltage stabilizing link, the input voltage that can make integrating circuit is with the proportional variation of supply voltage.In addition, because integration circuit time constant is certain, so the integrating circuit output voltage reaches the needed time of a certain value and can be along with the rising of supply voltage reduces.That is to say that when supply voltage rose, trigger pulse width reduced, strong excitation time shortens.And supply voltage is when descending, and trigger impulse is widened, and strong excitation time prolongs.Improved the adaptive capacity of electromagnet to change in voltage

4: increase attached rectifier diode D8, the D9 of helping

Though dc trigger circuit is simple more than pulsed triggering circuit, can reduce the reverse breakdown voltage of thyristor greatly.In order to improve this deficiency, the anode of thyristor SR1, SR2 in starting rectifier bridge has been connected in series an attached reverse voltage endurance capability that helps rectifier diode D8, D9 to improve thyristor SR1, SR2 so respectively.

Below in conjunction with embodiment description of drawings technical scheme details.

Fig. 1 is the electrical schematic diagram of a kind of embodiment of the utility model.

Circuit of the present utility model is to be made of following element and connected mode:

Transformer B and rectifier diode D1 D2 and worry ripple capacitor C 1 are formed power circuit, provide operating voltage to control triggering electric circuit.The integrating circuit that resistance R 1 and capacitor C 2 constitute is with door voltage stabilizing didoe Z makeup time control circuit.Discharge diode D5 is attempted by resistance R 1 two ends.Switch triode T and resistance R 2 constitute circuits for triggering, and diode D6, D7 are isolating diode, and its negative electrode is connected to the trigger electrode of thyristor SR1, SR2 respectively.Thyristor SR1, SR2 and attached rectifying tube D8, D9 and rectifying tube D10, the D12 of helping form bridge-type startup rectification circuit, and diode D12 is a fly-wheel diode.Transformer B and rectification D3, D4 form holding circuit.

When firm energising, power supply has been set up an operating voltage U C1 by transformer B and diode D1 D2 at worry ripple capacitor C 1 two ends, because at this moment the voltage U C2 at integrating capacitor C2 two ends is about zero, it is less than the junction voltage U be sum of threshold voltage U2 and the switch triode T of voltage stabilizing didoe Z, so switch triode T ends.Operating voltage U C1 provides trigger current by resistance R 2 and diode D6 D7 to thyristor SR1, SR2, and thyristor SR1, SR2 conducting respectively produces bigger magnet excitation electric current in electromagnet coil L, make the rapid adhesive of electromagnet armature.Meanwhile, operating voltage U C1 constantly charges to capacitor C 2 by resistance R 1, capacitor C 2 both end voltage U C2 constantly rise, as (the U c2 〉=Uz+0.7) of U C2 during greater than the junction voltage U be sum of the threshold voltage Uz of voltage stabilizing didoe Z and switch triode T, switch triode T saturation conduction is with the trigger current bypass.Thyristor SR1, SR2 end, and the magnet excitation process finishes.Simultaneously, the holding circuit that transformer B and diode D3 D4 form provides holding current to electromagnet coil L, makes armature continue to keep adhesive.When power cutoff, electromagnet armature discharges, capacitor C 1.By resistance R 2.The triggering knot discharge of diode D6, D7 and thyristor, capacitor C 2 is by diode D5, resistance R 2.The triggering knot discharge of diode D6, D7 and thyristor is prepared for starting next time.

The utility model has improved the anti-interference of circuit greatly.Impulse disturbances is very little to the output influence of integrating circuit, and integration circuit time constant is not subjected to the influence of thyristor, and has improved time control precision and carrying load ability.The integrating circuit output voltage reaches the needed time of a certain value and can be along with the rising of supply voltage reduces.When supply voltage descended, trigger impulse was widened, and strong excitation time prolongs, and has improved the adaptive capacity of electromagnet to change in voltage.

Claims

1. energy-saving electromagnetic rail controller, be to constitute by following circuit, transformer B and forward full-wave rectification diode D1, D2 constitutes power circuits with worry ripple capacitor C 2, supply with the operating voltage of the non-voltage stabilizing of control triggering electric circuit, it is characterized in that: resistance R 1, capacitor C 2 constitutes time control circuit with door voltage stabilizing didoe Z, discharge diode D5 is attempted by integrating resistor R1 two ends, switch triode T and resistance R 2 constitute circuits for triggering, diode D6, D7 is that its negative electrode of isolating diode is connected to thyristor SR1 respectively, the trigger electrode of SR2, thyristor SR1, SR2 and the attached rectifying tube D8 that helps, D9 and rectifying tube D10, D11 forms the startup bridge rectifier, the diode D12 that is connected to work of electromagnet coil L two ends is a fly-wheel diode, transformer B and negative sense full-wave rectification diode D3, D4 constitutes holding circuit.