CN2171168Y - Electronic power supply switch with automatic protective device for electric equipment - Google Patents

Abstract

The utility model relates to a multifunctional electronic power supply switch for the automatic protection of electric apparatuses. The utility model is characterized in that the utility model comprises a power input end in, a power output end out, a controlled silicon element SCR, a starting button switch J1, a power-off button switch J2, a controlled silicon control circuit (1) and a high-voltage testing circuit (2), wherein, the output end of the controlled silicon control circuit (1) is connected with the control electrode of the controlled silicon element SCR; the starting button switch J1 is connected with the controlled silicon element SCR in parallel; the power-off button switch J2 is connected with the controlled silicon element SCR in series. The utility model is further characterized in that the controlled silicon control circuit is a bistable circuit.

Description

Electronic power supply switch with automatic protective device for electric equipment

The utility model is about a kind of electrical equipment automatic safety device, more specifically says so and protects electronic power switch automatically about a kind of multifunctional electric appliance.

At present; because computer; the power circuit of color television set and high-tech product thereof does not also overcome the problem of serious superpressure; some grass-roots units manage improperly to power circuit; low when high when voltage occurring sometimes; phenomenon off and on; the zero line virtual connection; misconnection can cause the three-phase electricity imbalance; the problem that serious superpressure occurs; although the voltage scope of application of color television set is very wide; power supply and other circuit have added protective device; but do not overcome serious superpressure; power supply off and on; cause the problem of the badly damaged components and parts of some circuit, other high-tech product; household electrical appliance are all the more so.

Solve the electrical equipment superpressure, supply voltage is these a series of problems off and on, be electric equipment products promote longevity basic.

The purpose of this utility model will address the above problem exactly, and provides a kind of multifunctional electric appliance to protect electronic power switch automatically.

Automatically protect electronic power switch according to multifunctional electric appliance of the present utility model, it is characterized in that it comprises power input in, power output end out, start button switch J ₁, cut-off button switch J ₂, thyristor SCR, SCR control circuit (1), this circuit is by BG ₁, BG ₂, R ₃, R ₄, R ₅, R ₆, R ₇, R ₈, R ₉, form R ₅, R ₇, R ₉, be BG ₁, BG ₂The self-supporting back bias voltage resistance R of base stage ₈Be BG ₁Load resistance.R ₃Connect with the control utmost point internal resistance (CG end) of SCR and to be BG ₂Load resistance, R ₆, R ₄Be BG ₁, BG ₂The positively biased value resistance of base stage.High-voltage detecting circuit (2) is by R ₁₂, R ₁₃Variable resistor W, C ₃, D ₁Form.D ₂Protection component for control circuit (1).C ₂, R ₁₀, R ₁₁, D ₃Form the halfwave rectifier step-down, filter circuit.The R of SCR control circuit (1) ₃Connect with control board C, the G of controllable silicon SCR, start push switch J ₁In parallel with controllable silicon SCR, outage push switch J ₂SCR connects with the controllable silicon original paper, and it is further characterized in that described SCR control circuit (1) is a flip-flop circuit, and it also comprises outage indicating circuit (L ₁, R ₂) and power supply output indicating circuit (L ₂, R ₁₄).Silicon controlled rectifier protecting element (C ₁, R ₁).

Automatically protect electronic power switch to be elaborated below in conjunction with accompanying drawing to multifunctional electric appliance of the present utility model.

Fig. 1 protects the concrete line map of electronic power switch automatically for multifunctional electric appliance of the present utility model.

Its operation principle is as follows:

With reference to accompanying drawing 1, press manual push switch J ₁, J ₂Be normally closed some push switch.At this moment the 220V AC power is connected, (control circuit (1) and high-voltage detecting circuit (2) they are the half-wave power supply) thus normal direct-current power supply is arranged at A, the B two ends of high-voltage detecting circuit (2) and SCR control circuit (1), at the moment of energized, BG ₁, BG ₂The self-supporting back bias voltage of base stage by resistance R ₉Two ends produce V _R9The upper end for just, the lower end is for bearing.R ₅, R ₇Be respectively BG ₁, BG ₂The back bias voltage dropping resistor of base stage.R ₅Resistance is greater than R ₇So, BG ₂The autobias of base stage is less than BG ₁The self-supporting back bias voltage of base stage, promptly |-VBG ₂Eb|＜|-VBG ₁Eb|BG ₁, BG ₂, R ₄, R ₆, R ₈(R ₃+ R _CG) in (RCG is the internal resistance of the SCR control utmost point) flip-flop circuit of forming, because in the moment of energized, |-VBG ₂Eb|＜-| VBG ₁Eb|, thus make BG ₂Conducting, I _R3↑, I _CG↑, BG ₁End I _R8↓ at this moment the control utmost point of bidirectional triode thyristor SCR produces and keeps electric current I _CG, bidirectional triode thyristor conducting self-locking, power output circuit OUT has 220V alternating current output, output circuit indicator light L ₂Bright.This electronic switch energized begins operate as normal.

As supply voltage Vin ↑ when surpassing design load, the voltage V at high-voltage detecting circuit (2) A, B two ends _AB↑ rising, V _AF↑, D ₁Conducting, BG ₁Base stage obtains higher positive bias, circuit upset at this moment, BG ₁Conducting I _R8↑ BG ₂By I _CGThereby the outage of ↓ bidirectional triode thyristor control board dead electricity bidirectional triode thyristor SCR self-locking releasing, indicator light L ₁Bright, expression superpressure, thus reach the purpose of protecting this switch and electric equipment products.D ₂Owing to the voltage stabilizing value height of choosing, surpass rapid conducting when being definite value at supply voltage, its effect is to ensure that SCR control circuit (1) is working properly stable when serious superpressure in this circuit.The output voltage working range of this electronic switch can be adjusted W as required and decide.

The under-voltage shutdown of this electronic switch is～120V, the control electrode current I of SCR when supply voltage Vin ↓ decline _CG↓ decline, I _CGWhen electric current was reduced to the blocking state of SCR, controllable silicon SCR was cut off the power supply, thereby reached the purpose of under-voltage shutdown.The benefit of doing like this be in the big area of power-supply fluctuation, its voltage power supply wide ranges (～120-240V) (adjustable) as the under-voltage power-down value of adjunct circuit

This electronic switch is when operate as normal, when having a power failure suddenly, bidirectional triode thyristor SCR control utmost point dead electricity I _CG↓, the releasing that cuts off self-lock of SCR cathode-anode plate, from then on this electronic switch reaches the back purpose of shutdown automatically that has a power failure.

Generally speaking, this electronic switch no matter be superpressure, under-voltage, having a power failure to reach the purpose of automatic shutdown, power up just often, trigger J ₁This switch works on.Because this switching circuit has all adopted the contactless contact of electronic component (not comprise J ₁, J ₂) the fast advantage of motor speed is closed in superpressure, under-voltage power failure, be that any circuit breaker automatic safety device is incomparable.Shutdown back 400V Gao Liudian enters this machine and also can not damage this electronic switch.

The utility model multifunctional electric appliance protects electronic power switch to have following function automatically.

(1), superpressure shut down automatically (the superpressure value is adjustable).

(2), under-voltage automatic shutdown.

(3) its powered-down automatically of back that has a power failure.

(4) it has ON and two trigger switches of OFF, can make the switch of alternating current circuit.

The utility model electronic switch has following characteristics:

(1), volume is little, in light weight, circuit is simple.

(2) power output big, can manufacture electronic switch products such as 500W, 10KW respectively according to this circuit theory.

(4), its wideest being transferred to of voltage power supply scope (～120-250V).

(5) power supply is output as sine wave, can not produce any electrical equipment and disturb.

(6) antijamming capability own is strong.

This electronic switch is electronic technology field sheerly.Shell sizes behind the circuit integration as the matchbox size, it can replace traditional touch switch, have than traditional touch switch and increased by three functions, it has stable performance, reliable operation, it has the advantage of light velocity shutdown when power supply breaks down, the appearance of this product just is equivalent to the appearance of high-grade electronic product insurance company.This switch has overcome the problem of Japanese electric apparatus unconquerable damage power supply components and parts when serious superpressure.This electronic switch can be widely used in computer, colour TV and the use supporting with it of all electronic technology fields thereof.Or the form and the various electrical matching that manufacture protector use.Make electrical equipment promote longevity, benefit for the mankind.

Claims (3)

1, a kind of multifunctional electric appliance is protected electronic power switch automatically, it is characterized in that it comprises power input in, power output end out, thyristor SCR, starts push switch J ₁, outage push switch J ₂, SCR control circuit (1) and high-voltage detecting circuit (2); The output of SCR control circuit (1) is connected with the control utmost point of thyristor SCR; Start push switch J ₁SCR is in parallel with thyristor; Outage push switch J ₂SCR connects with thyristor.

2, protect electronic power switch automatically according to the said multifunctional electric appliance of claim 1, it is characterized in that described SCR control circuit (1) is a bistable circuit.

3, protect electronic power switch automatically according to the said multifunctional electric appliance of claim 1, it is characterized in that it also comprises outage indicating circuit (L ₁, R ₂) and power supply output indicating circuit (L ₂, R ₁₄).

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