CN2239683Y - Touch switch - Google Patents

Abstract

The utility model discloses a touch switch, relating to a device which can control the turnon and turnoff of the load in a mains supply circuit, particularly a control device of working in mains supply, connecting in series with the load, having similar function with a common single-pole double-throw switch, and controlling the switching on or off of the load through touching the triggering end. The working power supply of the circuit turned on is supplied by the mains supply before the conducting angle of a silicon controlled. The utility model has the advantages of small voltage drop of the circuit during conducting and low power consumption.

Description

Soft-touch control

The present invention relates to a kind ofly can control the load energising in the mains circuit or the device of outage, especially work in control device in the civil power, that connect with load, that function is similar to common single-pole double-throw switch (SPDT), that can control load switch on or cut off the power supply by its trigger end of touch.

At present, the technology that can finish this function is existing, used the situation of the higher or element that volume is bigger of cost though ubiquity that the circuit turn-on pressure drop is big, circuit is complicated or circuit is uncomplicated, thereby Overall Power Consumption is big, cost is higher or volume is bigger.

Purpose of the present invention provides a kind of control device with this function, and its circuit is simple and use low cost and small size element, so the complete machine cost is lower, volume is less, in addition, because the pressure drop when conducting of its circuit is less, so power consumption is lower.

The present invention is achieved in that on the outer surface of the insulation crust of this device, is fixed with and touches sheet metal M; In insulation crust, be fixed with the printed circuit board (PCB) of this device, its circuit is made up of full-bridge BR, unidirectional controllable silicon S CR, diode D1, D2, D3, D4, D5, voltage stabilizing didoe DZ1 and DZ2, LED, resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, capacitor C 1, C2, C3, C4, C5, C6, triode T1, T2, T3, T4: two ac input ends of BR (AC end) connect an end AC0 of civil power and the end of load RL respectively, and the " " end in two outputs "+", " " is reference ground " GND "; The other end AC1 of another termination civil power of RL; The positive pole of SCR meets "+", and negative pole meets " GND ", and gate pole connects the end of R1 and the end of C1; Another termination " GND " of R1; The end of another termination R2 of C1 and the negative pole of D1; The positive pole of another termination D2 of R2, the negative pole of D2 connect the end of R3, the emitter of T2 and the positive pole of C3; The base stage of another termination T2 of R3, the end of R4 and the end of R5, the negative pole of D4; The collector electrode of another termination T1 of R4; The collector electrode of T2 connects the base stage of T1 and the positive pole of C2; The emitter of T1 meets " GND "; The negative pole of C2 meets " GND "; The negative pole of C3 meets " GND "; The positive pole of D1 connects the positive pole of D3 and the negative pole of DZ1, the end of R8; Another termination "+" of R8; The negative pole of D3 connects the other end of R5, the positive pole of C4 and the drain D of T3; The negative pole of C4 meets " GND "; The source S of T3 meets " GND "; The grid of T3 connects the end of R6, the end of R7; Another termination " GND " of R6; Sheet metal M is touched in the other end contact of R7; The positive pole of DZ1 meets " GND "; The positive pole of D4 connects the end of R9, the collector electrode of T4, the positive pole of C5 and the negative pole of DZ2; Another termination "+" of R9; The negative pole of C5 meets " GND "; The negative pole of DZ2 meets " GND "; The emitter of T4 meets " GND "; The base stage of T4 connects the negative pole of D5; The positive pole of D5 connects the negative pole of LED, the positive pole of C6 and the end of R11; Another termination " GND " of R11; The negative pole of C6 connects " GND '; The positive pole of LED connects the end of R10; Another termination "+" of R10.During actual the use, general AC 0 connects the zero line of civil power, and AC1 connects the phase line of civil power.

In the circuit, it is the all-wave Rectified alternating current of 100Hz that full-bridge BR is used for the 50Hz commercial power rectification, for subsequent conditioning circuit provides supply power voltage.SCR is a master switch, and R1 is used to prevent the SCR false triggering.T1, T2 form the simulation controllable silicon of controlled shutoff, simulation silicon controlled anode is the emitter of T2, negative electrode is the emitter of T1, controls the very base stage of T2, and R3, C2 are used for the anti-controllable silicon false triggering of simulating here, C3 is used for temporarily providing the simulation silicon controlled to keep electric current, the effect of R4 has two, and effect is that this simulation controllable silicon can be turn-offed under it controls the control of the utmost point, if the R4 short circuit, then the T1 collector electrode directly links to each other with the base stage of T2, and the simulation controllable silicon is difficult to be turn-offed by the control of the control utmost point; Another effect is to reduce simulation silicon controlled conducting electric current, or claims to increase conducting resistance.This simulation controllable silicon gets final product conducting when its control utmost point (being the base stage of T2) input low level pulse signal; Desire to change shutoff into, two approach are then arranged by conducting, the one, make its anode current (promptly flowing through the electric current of R2, D2) keep electric current less than it, the one, its control utmost point (T2 base stage) is added sufficiently high voltage, make the T2 reverse bias.T3 is a N ditch VMOS pipe; Be used for the human body touch signal is converted into switching signal in the circuit, C4, R6 are used to prevent that it from misleading, and R7 is used for controlling the input impedance of trigger end.T4 etc. have formed inverter, when the instantaneous voltage of BR output is higher, and the T4 conducting, thus make the current potential of D4 positive pole become very low.LED is as indicator light, and the operating state at that time that both can represent this device is an off-state, can indicate the position of this device again when dark (lamp goes out), is convenient to user's operation.Voltage stabilizing didoe DZ1, DZ2 are used for clamp, can obtain the voltage of process clamp at its anode.C5 is used for filtering, when T4 by the time, even when its positive pole can obtain at alternating voltage zero-crossing also continual direct voltage, this voltage provides the reverse biased that can make it end by D4 for the simulation silicon controlled control utmost point.The effect of C6 is, makes T4 that be arranged one period time of delay (being about 1s) when state-transition, rationally gets the numerical value of R11, R9, then can accomplish: when the instantaneous value of the voltage at SCR two ends during greater than about 200V, just conducting of T4 (crossing after about 1s), otherwise end; When the instantaneous value of the voltage at SCR two ends during at about 100V to 200V, the simulation controllable silicon obtains enough strong reverse biased and ends; When the instantaneous value of the voltage at SCR two ends during less than 100V, the simulation controllable silicon can not get reverse biased or the reverse biased that obtains strong inadequately, can not turn-off by the control of the control utmost point.

In the time of in this device place in circuit first time, switch on moment, SCR does not turn-off because of there being the control electrode current, and load RL both end voltage is 0V, and the voltage behind the commercial power rectification all is added in the two ends of SCR; Moment after the energising, the voltage at SCR two ends charges to C1 by R8, D1, thereby produces charging current, and this charging current partly flows into the control utmost point of SCR, makes the SCR conducting.Yet because the value of C1 is very little, C1 is filled very soon, thereby no longer has charging current, SCR thereby shutoff; This moment, this device just formally entered operating state.Because of SCR ends, be the summation that flows through the electric current of R8, R9 and R10 so flow through the electric current of RL, but,, be equivalent to this device and be in " disconnection " state so flow through the electric current of RL very little (mA magnitude) because of the value of R8, R9 and R10 is all very big.This moment, LED was luminous because of there being electric current to flow through.Simultaneously, the T4 conducting makes the anodal current potential step-down of D4, and forfeiture makes the trigger voltage of simulation controllable silicon input low level become possibility to drawing effect on the T2 base stage.At this moment,, then obtain the dividing potential drop of voltage on R6 of human body sensing, make the T3 conducting, thereby the base potential of T2 descends T2 conducting, T1 conducting (i.e. the controllable silicon conducting of being made up of T1, T2) because of the drop-down effect of R5 because of the G utmost point of T3 if there is the people to touch sheet metal M.After the conducting, the electric charge that is full of on the C1 will bleed off by R2, D2, simulation controllable silicon, GND, R1, simultaneously, electric charge on the C3 is also bled off a part, but because the capacity of C3 is bigger, and simulation silicon controlled conducting resistance is bigger, so its discharge needs the long time (about about 1s), even so the time remove trigger voltage, C1 no longer for the simulation controllable silicon provides anode current, C3 also can be it provides anode current to continue conducting a period of time (about also about 1s) to keep it.During human body touch, because the T3 conducting, so C1 can not obtain charging voltage, also can there be charging current in the current potential of positive pole that makes D3, so SCR still ends by very lowly drop-down.If this moment, in time (electric charge on C3 bleed off before) removed touch signal, (in fact the time that is human body touch be less than 1s, the human body touch time is generally about the hundreds of millisecond), then this device will change on-state into, its detailed process is as follows: at first, T3 ends, and pulsating dc voltage is that the C1 charging becomes possibility by R8, D1, in case enough big charging current flows through the control utmost point of SCR, then SCR conducting.After the SCR conducting, it is very low that the voltage at SCR two ends becomes, the charging process of C1 stops, begin by still keeping the simulation controllable silicon discharge of conducting, this process is performed until the 100Hz pulsating dc voltage end in cycle this time of BR rectification, it is the zero crossing place, SCR turn-offs because of no anode current, after next cycle begins, SCR still turn-offs, so the voltage at SCR two ends constantly rises, begins the charging for C1, when the voltage at SCR two ends is enough big (greatly about about 10V), there is enough big charging current to flow through the control utmost point of SCR, makes SCR conducting again, repeat the process of one-period, that is to say, because C1 constantly, charging automatically, discharge, SCR is operated in the control conducting state of pilot angle minimum (angle of flow is near one-period), and the RL two ends can obtain near complete alternating voltage, that is this moment, this device was in " connection " state.Afterwards, if the someone touches sheet metal again, then T3 conducting, it is very low that the current potential of the positive pole of D3 becomes, and is that the electric current that C1 charges is shunted a part by R8, D1 originally, makes the conducting of SCR become difficult.When originally the control electrode current was big, the voltage at SCR two ends is increased to more than the 10V can make the SCR conducting, because the control electrode current is less, the voltage at SCR two ends need be increased to more than the 100V just can make the SCR conducting now.In a single day the voltage at SCR two ends be increased between 100V and the 200V, then the negative pole of D4 can overcome the drop-down effect of R5 and provide enough strong high voltage (for the simulation controllable silicon, be reverse biased), the simulation controllable silicon is turn-offed, thereby C1 has lost discharge loop, charging current is more and more littler, and SCR is not turn-offed fully because of there being the control electrode current.SCR closes and to have no progeny since the time of general human body touch about the hundreds of millisecond, so on time sequencing, at first generation is that touch signal is removed, T3 ends; Generation is then, and the voltage at SCR two ends is that C6 is charged to the T4 conducting by R11, LED, makes the current potential step-down of D4 positive pole, is that the reverse biased that the simulation controllable silicon provides disappears, and this device comes back to " shutoff " state.

Because in this circuit, do not use that transformer, decompression capacitor or integrated circuit etc. are expensive, the element of large volume, so the cost of this device is lower, volume is less; In addition because this device exists " connection " during state the operating voltage of circuit before by the angle of flow of civil power at SCR during in provide, rather than seal in the method acquisition in SCR loop by resistance, so the pressure drop during conducting is the conduction voltage drop of SCR only, power consumption is very little.

The invention will be further described below in conjunction with drawings and Examples.

This embodiment is that overall dimension and external circuit connection are all identical with common wall type key switch, can control the touch switch device of incandescent lamp loads energising (lighting) or outage (extinguishing) by touching its trigger end (touching sheet metal M).

Accompanying drawing is circuit theory diagrams of the present invention.

Circuit part is made up of full-bridge BR, unidirectional controllable silicon S CR, diode D1, D2, D3, D4, D5, voltage stabilizing didoe DZ1 and DZ2, LED, resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, capacitor C 1, C2, C3, C4, C5, C6, triode T1, T2, T3, T4; Two ac input ends of BR (AC end) connect an end AC0 of civil power and the end of incandescent lamp loads RL respectively, and the " " end in two outputs "+", " " is reference ground " GND "; The other end AC1 of another termination civil power of RL; The positive pole of SCR meets "+", and negative pole meets " GND ", and gate pole connects the end of R1 and the end of C1; Another termination " GND " of R1; The end of another termination R2 of C1 and the negative pole of D1; The positive pole of another termination D2 of R2, the negative pole of D2 connect the end of R3, the emitter of T2 and the positive pole of C3; The base stage of another termination T2 of R3, the end of R4 and the end of R5, the negative pole of D4; The collector electrode of another termination T1 of R4; The collector electrode of T2 connects the base stage of T1 and the positive pole of C2; The emitter of T1 meets " GND "; The negative pole of C2 meets " GND "; The negative pole of C3 meets " GND "; The positive pole of D1 connects the positive pole of D3 and the negative pole of DZ1, the end of R8; Another termination "+" of R8; The negative pole of D3 connects the other end of R5, the positive pole of C4 and the drain D of T3; The negative pole of C4 meets " GND "; The source S of T3 meets " GND "; The grid of T3 connects the end of R6, the end of R7; Another termination " GND " of R6; Sheet metal M is touched in the other end contact of R7; The positive pole of DZ1 meets " GND "; The positive pole of D4 connects the end of R9, the collector electrode of T4, the positive pole of C5 and the negative pole of DZ2; Another termination "+" of R9; The negative pole of C5 meets " GND "; The negative pole of DZ2 meets " GND "; The emitter of T4 meets " GND "; The base stage of T4 connects the negative pole of D5; The positive pole of D5 connects the negative pole of LED, the positive pole of C6 and the end of R11; Another termination " GND " of R11; The negative pole of C6 connects " GND '; The positive pole of LED connects the end of R10; Another termination "+" of R10.During actual the use, general AC 0 connects the zero line of civil power, and AC1 connects the phase line of civil power.

This switching device is in that " disconnection is " during state, SCR turn-offs, the electric current that flows through RL is the summation that flows through the electric current of R8, R9 and R10, but because of the value of R8, R9 and R10 all very big, so flow through the electric current very little (mA magnitude) of RL, so incandescent lamp is not luminous, but LED is luminous because of there being electric current to flow through, in order to indicate the position of this switch, be convenient to the user and operate in the dark.Simultaneously, the T4 conducting makes the anodal current potential step-down of D4, and forfeiture makes the trigger voltage of simulation controllable silicon input low level become possibility to drawing effect on the T2 base stage.At this moment, if there is the people to touch sheet metal M, then T3 conducting, thus the simulation controllable silicon is controlled the drop-down effect conducting that utmost point is subjected to R5 because of it, after the conducting, the electric charge that is full of on the C1 will bleed off by R2, D2, simulation controllable silicon, GND, R1, simultaneously, the electric charge on the C3 is also bled off a part, if in time remove touch signal this moment, then simulate controllable silicon and can keep conducting, for the charging of C1 provides may.Afterwards, pulsating dc voltage constantly is the C1 charging, constantly simulateding controllable silicon again bleeds off, thereby constantly the control utmost point for SCR provides the trigger current pulse, makes SCR be operated in the control conducting state of pilot angle minimum (angle of flow is near one-period), and the RL two ends can obtain near complete alternating voltage, that is, this moment, this device was in " connection " state, and incandescent lamp is luminous, and LED extinguishes.Afterwards, if the someone touches sheet metal again, and in time remove touch signal, then T3 conducting, the current potential of the positive pole of D3 become very low, are that the electric current that C1 charges is shunted a part by R8, D1 originally, make the conducting of SCR become difficult, the conducting breakover voltage uprises, and makes the D4 output HIGH voltage, order simulation controllable silicon turn-offs, thereby C1 has lost discharge loop, and charging current is more and more littler, and SCR is not turn-offed fully because of there being the control electrode current, this device is got back to again again, and " " state, incandescent lamp extinguishes in shutoff.After SCR ended, the high voltage at SCR two ends made the T4 conducting, made the current potential step-down of D4 positive pole, removed the reverse biased that is added in the simulation SCR control utmost point, got ready for triggering again.

Claims (1)

1. A kind of soft-touch control on the outer surface of its insulation crust, is fixed with and touches sheet metal M; In insulation crust, be fixed with the printed circuit board (PCB) of this circuit, its circuit part is by full-bridge BR, unidirectional controllable silicon S CR, diode D1, D2, D3, D4, D5, voltage stabilizing didoe DZ1, DZ2, LED, resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, capacitor C 1, C2, C3, C4, C5, C6, triode T1, T2, T3, T4 forms, it is characterized in that: two ac input ends of BR (AC end) connect an end AC0 of civil power and the end of load RL respectively, and the " " end in two outputs "+" " " is reference ground " GND "; The other end AC1 of another termination civil power of RL; The positive pole of SCR meets "+", and negative pole meets " GND ", and gate pole connects the end of R1 and the end of C1; Another termination " GND " of R1; The end of another termination R2 of C1 and the negative pole of D1; The positive pole of another termination D2 of R2, the negative pole of D2 connect the end of R3, the emitter of T2 and the positive pole of C3; The base stage of another termination T2 of R3, the end of R4, the end of R5, the negative pole of D4; The collector electrode of another termination T1 of R4; The collector electrode of T2 connects the base stage of T1 and the positive pole of C2; The emitter junction of T1 " GND "; The negative pole of C2 meets " GND "; The negative pole of C3 meets " GND "; The positive pole of D1 connects the positive pole of D3 and the negative pole of DZ1, the end of R8; Another termination "+" of R8; The negative pole of D3 connects the other end of R5, the positive pole of C4 and the drain electrode of T3; The negative pole of C4 meets " GND "; The source electrode of T3 meets " GND "; The grid of T3 connects the end of R6, the end of R7; Another termination " GND " of R6; Sheet metal M is touched in the other end contact of R7; The positive pole of DZ1 meets " GND "; The positive pole of D4 connects the end of R9, the collector electrode of T4, the positive pole of C5 and the negative pole of DZ2; Another termination "+" of R9; The negative pole of C5 meets " GMD "; The positive pole of DZ2 meets " GND "; The emitter of T4 meets " GND "; The base stage of T4 connects the negative pole of D5; The positive pole of D5 connects the end of negative pole, C6 positive pole and the R11 of LED; Another termination " GND " of R11; The negative pole of C6 meets " GND "; The positive pole of LED connects the end of R10; Another termination "+" of R10.

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