CN2318007Y - Charging and plug-in power driver of shaver - Google Patents

Abstract

The utility model relates to a charging and plug-in power driver of the shaver. The utility model is provided with a rectifying and filtering circuit, a pulse transformer and a switch triode. One end of the primary coil of the pulse transformer is connected with the collector of the switch triode, and the other end of the primary coil of the pulse transformer is connected with the output end of the rectifying and filtering circuit. The first secondary coil of the pulse transformer, the pulse rectifying and filtering circuit, and the charging battery are half connected to form a circuit. The output end of the second secondary coil of the pulse transformer is connected with a positive feedback circuit in series, and is connected with the base of the switch triode. The base of the switch triode is connected with the output end of the rectifying and filtering circuit through a resistor. The utility model is characterized in that the utility model is provided with a pulse width modulation circuit which is composed of a zener diode and a resistor; a resistor with larger resistance value is connected with the transmitting electrode of the switch triode in series; another resistor with smaller resistance value is connected with the resistor with larger resistance value through the switch in parallel; the clamp end of the zener diode is connected with the base of the switch triode, and the other end of the zener diode is connected with one end of the resistor with larger resistance value which is connected with the transmitting electrode.

Description

The double plug-in drive unit of shaver charging

The utility model about a kind of input charging AC power of utilizing to battery charge or directly drive the device of shaver.

Charging device in the common rechargeable type electric shaver includes current rectifying and wave filtering circuit, pulse transformer, switch triode, the impulse commutation filter circuit, positive-feedback circuit and pulse width modulation circuit etc., the charging current and the voltage thereof of sort circuit output are fixed, also adopt the transformer of smaller size smaller to cause general charging current smaller as another to adapt to the little exquisite shaver of body, be about 1/10th of battery capacity, this charging current can not enough directly drive direct current generator, when use on the historical facts or anecdotes border, adopt the charging device of above-mentioned circuit common, when battery capacity is not enough, can not directly come drive motors by plug-in.

The purpose of the utility model is that will to overcome the deficiencies in the prior art and a kind of charging and direct drive motors of collecting is provided be the shaver charging of the body plug-in drive unit of holding concurrently.

The double plug-in drive unit of this shaver charging, still has current rectifying and wave filtering circuit, pulse transformer, switch triode, pulse transformer primary coil one end connects with the switch triode colelctor electrode, the other end and rectification filter circuit output end link, pulse transformer first secondary coil and impulse commutation filter circuit and rechargeable battery partly join forming circuit, after connecting with positive-feedback circuit, pulse transformer second subprime coil output connects with the switch triode base stage, the switch triode base stage is connected with the rectifying and wave-filtering output by resistance, it is characterized in that the pulse width modulation circuit that is provided with is made up of Zener diode and resistance, wherein one, the resistance string of big resistance is associated in switch triode, emission is regained on the road, the less resistance of another resistance is in parallel by the bigger resistance of switch and resistance, Zener diode clamper end connects with the switch triode base stage, and the resistance sending and receiving that the other end and resistance are bigger are penetrated several ends and connected.

The utility model is by transferring the improvement setting of stretch circuit to normal pulsed, Zener diode is incorporated in this circuit, change the switch triode saturation time and determined the output voltage size of current by changing negative feedback resistor value on the emitter circuit wherein, so can be respectively to the rechargeable battery charging or to motor direct-drive, the former relatively charging device of the utility model with foregoing circuit design feature is only done effectively improvement of a part, and need not change transformer etc., make this device still keep small size and be applicable to common shaver.

Further illustrate the utility model below in conjunction with description of drawings and the concrete operation principle of circuit, say embodiment simultaneously.

Fig. 1 is the utility model embodiment circuit block diagram;

Fig. 2 is the utility model embodiment electronic circuitry;

As shown in the figure, among the utility model embodiment positive-feedback circuit by C ₄, D ₂, R ₃Form, wherein C ₄And D ₂Parallel connection, this circuit is provided with because C ₄Discharge voltage is subjected to D ₂The clamper influence can make feedback become a fixed constant deadline, helps controlling output voltage values.Other is provided with by triode Q ₂And resistance R ₇With diode D ₅Second pulse width modulation circuit of forming is also to switch triode Q ₁Feedback modulation, wherein triode Q ₂Base stage is passed through D ₅Connect R with the motor M input ₇Be serially connected in triode Q ₂Base stage and emitter stage between, Q ₂Colelctor electrode and switch triode Q ₁Base stage connect.At the less resistance R of control resistance ₅The resistance R bigger with resistance ₄Gauge tap K in parallel or disconnect _1-1, present embodiment also is set as the switch R with rechargable battery drive motors M _1-2Interlock makes it to become ganged switch.In order to improve pulse transformer B primary coil N ₁Breakdown characteristics and keep whole device not damaged by the civil power high pressure, present embodiment is also at N ₁Two ends series connection by resistance R ₁, capacitor C ₃And diode D ₁The damping network circuit of forming, wherein, R ₁With C ₃After the parallel connection again with D ₁Serial connection is in series with fuse cutout R in the current rectifying and wave filtering circuit loop in addition _T, this fuse cutout R _TBe attached to the preposition current-limiting resistance R of current rectifying and wave filtering circuit ₈On.

For better explanation the utility model and embodiment, existing in conjunction with electricity work principle and illustrate further and illustrate:

Civil power 220V alternating current is through C ₁, R ₈After the filtering, through bridge rectifier QL rectification and L ₁, L ₂, C ₂Filtering obtains a direct current voltage, in the self-oscillatory trace of the circuit stage, because R ₂Effect, switch triode Q ₁Obtain a small bias current, Q ₁The beginning conducting, pulse transformer B primary coil N ₁There is electric current to produce.At this moment, the 2nd coil N of pulse transformer B ₃Induce driving pulse negative just down on, this pulse is through C ₄, D ₂And R ₃Be added to Q ₁Base stage forms strong positive feedback, makes Q ₁Enter rapidly saturated, primary coil N ₁Electric current be linear and increase, this moment the pulse transformer B first secondary coil N ₂Induce negative positive pulse voltage down, D ₄End, in the flyback stage, along with C ₄Be energized pulse charge, C ₄Both end voltage increases, N ₃Supply with switch triode Q ₁The electric current of base stage reduces; In addition, main is because Zener diode D ₃To Q ₁The clamping action of base voltage is serially connected with Q when flowing through ₁The negative feedback resistor R of emitter stage ₄Or R ₄, R ₅Electric current increase, make Q ₁Base-emitter voltage V reduce, thereby make switching tube Q ₁Base current reduces.More than the common result of two kinds of effects will make Q ₁Base current is reduced to and makes switch triode Q ₁Withdraw from saturated and enter the amplification region, also make Q ₁Collector current descends, and transformer B primary coil N flows through ₁Electric current reduce N ₁Two ends induce negative positive induced voltage down on, and make N ₃Also induce negative positive driving pulse down on.This driving pulse is through C ₄, R ₃, D ₂Be added to Q ₁Base stage has been quickened switch triode Q ₁Reducing of base current makes Q ₁End rapidly.Q ₁After ending, N ₂Induce negative just down pulse, D ₄Conducting, the B energy stored is passed through N ₂And D ₄Load is discharged, form output load current.

For avoiding primary coil N ₁Electric current is because of Q ₁Collector current reduces suddenly and induces a very high voltage and puncture Q ₁, this circuit adopts R ₁, C ₃, D ₁The damping network circuit of forming is as elementary coil N ₁Have when just going up negative induced voltage generation down; This voltage passes through D ₁, C ₃, R ₁Discharge makes primary coil N ₁Electric current is unlikely to be reduced too soon, works as C ₄Both end voltage is passed through D ₃, R ₃Discharge finishes, and DC voltage passes through R again ₂Be added to switch triode Q ₁Base stage makes Q ₁Base potential rises and conducting has begun next cycle of oscillation again.

This circuit output voltage V _oBe proportional to primary coil N ₁With the first secondary coil N ₂Turn ratio, also be proportional to Q ₁The ratio of saturation conduction time and deadline.Its output voltage V _oFormula is: $V_o=\frac{T_1}{{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="Y9723157600061.png,Y9723157600062.png"\; state="\{\{state\}\}">T</figure-callout>}}_2}\&CenterDot;\frac{V_1}{n}$

T ₁Be Q ₁Saturation time, T ₂Be Q ₁Deadline, Vi is the DC voltage behind the rectifying and wave-filtering, and n is N ₁With N ₂Turn ratio.Switch triode Q ₁Deadline T ₂Depend on C ₄Discharge time because D ₂To C ₄Clamp, C ₄Discharge time is constant substantially.Therefore, only need to change Q ₁The saturation conduction time T ₁, can change output voltage V _o, because the originality that the utility model paired pulses transfers stretch circuit to be provided with only needs by changing switch triode Q ₁The negative feedback resistor resistance of emitter circuit serial connection just can realize changing Q ₁The saturation conduction time, make the different load voltage of circuit output, thereby obtain different load currents.When only needing to battery charge, Q ₁Emitter stage only is connected in series R ₄, R ₅By the K in the ganged switch _1-1Disconnect R ₄Resistance is relatively large.Because Q ₁Base voltage is by Zener diode D ₃The avalanche breakdown voltage clamp, R ₄Pressure drop is with switch triode Q ₁Emitter current rises and rises comparatively fast, and the switching tube saturation conduction time is comparatively fast finished.Therefore, N ₂Output voltage is low, and charging current is little.K in ganged switch _1-1When being pushed into " ON " position, the resistance R that resistance is less ₅Be parallel to R ₄On, thereby make Q ₁The serial connection negative feedback resistor diminishes O ₁The pressure drop of emitter current on negative feedback resistor risen slack-off, Q ₁The saturation conduction time lengthening, thus make N ₂Output voltage raises, and obtains bigger output load current.Simultaneously, the group of another in ganged switch K _1-2Cell voltage also is added on the direct current generator, electric motor starting, it is better making operational coordination.

For making N ₂Output voltage is unlikely because of factors such as DC voltage Vi rising rise De Taigao, and cell voltage passes through D from connecting the direct current generator input ₅Be added to transistor Q ₂Base stage, when cell voltage greater than D ₅With transistor Q ₂During base junction conducting voltage sum, Q ₂Conducting, Q ₂Collector potential descends, thereby makes switch triode Q ₁Base potential descends, Q ₁End Q in advance ₁The saturation conduction time shortens, output voltage V _oReduce.

R _TBe thermistor, in actual product with R ₈Abut against together, when circuit overload or fault cause that input civil power alternating current is excessive, R _TResistance increases severely, R _TDisconnect, thereby disconnect main circuit, play a protective role.

Claims (8)

1, the double plug-in drive unit of a kind of shaver charging, has current rectifying and wave filtering circuit, pulse transformer, switch triode, pulse transformer primary coil one end connects with the switch triode colelctor electrode, the other end and rectification filter circuit output end link, pulse transformer first secondary coil is connected with impulse commutation filter circuit and rechargeable battery and is constituted the loop, after connecting with positive-feedback circuit, pulse transformer second subprime coil output connects with the switch triode base stage, the switch triode base stage is output end by resistance with the rectification filter and is connected, and the pulse width modulation circuit that it is characterized in that being provided with is by Zener diode D ₃And resistance R ₄, R ₅Form, wherein, the resistance R of big resistance ₄Be connected on switch triode Q ₁On the emitter circuit, the resistance R that another resistance is less ₅Pass through K switch _1-1The resistance R bigger with resistance ₄Parallel connection, Zener diode D ₃Clamper end and switch triode Q ₁Base stage connects, the resistance R that the other end and resistance are bigger ₄One end of non-sending and receiving emitter-base bandgap grading connects.

2, according to the double plug-in drive unit of the described shaver charging of claim 1, it is characterized in that being provided with by triode Q ₂And resistance R ₇With diode D ₅Second pulse width modulation circuit of forming, wherein triode Q ₂Base stage is by diode D ₅Connect resistance R with the motor M input ₇Be serially connected in triode Q ₂Base stage and emitter stage between, triode Q ₂Colelctor electrode and switch triode Q ₁Base stage connect.

3, according to claim 1 or the double plug-in drive unit of 2 described shaver chargings, it is characterized in that controlling the less resistance R of resistance ₅The resistance R bigger with resistance ₄K switch in parallel or disconnect _1-1K switch with rechargeable battery drive motors M _1-2Interlock.

4, according to claim 1 or the double plug-in drive unit of 2 described shaver chargings, it is characterized in that by resistance R ₁, capacitor C ₃And diode D ₁The damping network circuit of forming is serially connected in pulse transformer B primary coil N ₁Two ends, wherein, resistance R ₁With capacitor C ₃After the parallel connection again with diode D ₁Series connection is in series with fuse cutout R in the current rectifying and wave filtering circuit loop _T, this fuse cutout R _TBe attached to the preposition current-limiting resistance R of current rectifying and wave filtering circuit ₈On.

5, according to the double plug-in drive unit of the described shaver charging of claim 3, it is characterized in that by resistance R ₁, capacitor C ₃And diode D ₁The damping network circuit of forming is serially connected in pulse transformer B primary coil N ₁Two ends, wherein, resistance R ₁With capacitor C ₃After the parallel connection again with diode D ₁Series connection is in series with fuse cutout R in the current rectifying and wave filtering circuit loop _T, this fuse cutout R _TBe attached to the preposition current-limiting resistance R of current rectifying and wave filtering circuit ₈On.

6, according to claim 1 or the double plug-in drive unit of 2 or 5 described shaver chargings, it is characterized in that positive-feedback circuit is by capacitor C ₄, diode D ₂And resistance R ₃Form, wherein C ₄With D ₂Parallel connection.

7, according to the double plug-in drive unit of the described shaver charging of claim 3, it is characterized in that positive-feedback circuit is by capacitor C ₄, diode D ₂And resistance R ₃Form, wherein C ₄With D ₂Parallel connection.

8, according to the double plug-in drive unit of the described shaver charging of claim 4, it is characterized in that positive-feedback circuit is by capacitor C ₄, diode D ₂And resistance R ₃Form, wherein C ₄With D ₂Parallel connection.

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