CN2754253Y - Silicon controlled rectifier charging circuit - Google Patents

Abstract

The utility model relates to a circuit which uses a thyristor to carry out charge for accumulators. The utility model is mainly composed of an autotransformer, a thyristor, a power circuit, a synchronous sampling circuit, a shaping circuit, a triggering pulse shaping circuit, a triggering and driving circuit and a filter circuit. The utility model forms the triggering pulse of the thyristor through the variation of the sine wave voltage of a synchronous sampling power supply, which makes the thyristor begun to be switched on near the zero crossing point of the voltage of the power supply. The size of charging voltage and current can be changed by regulating the duty ratio of the triggering pulse. The utility model can meet the charging requirements of general accumulators and accumulator batteries. The structure of the whole circuit is simple, and the work is stable and reliable.

Description

The controllable silicon charging circuit

Affiliated technical field

The utility model relates to a kind of circuit that controllable silicon charges to storage battery of controlling, by autotransformer, controllable silicon, power circuit, the synchronized sampling circuit, shaping circuit, trigger impulse forms circuit, triggering drive circuit and filter circuit forms, it is that variation by synchronized sampling power supply sine voltage forms the silicon controlled trigger impulse, make controllable silicon begin the conducting of synchronous triggering controllable silicon and realize not having the may command charging circuit conducting of impacting soft start work at the supply voltage near zero-crossing point, the duty ratio of regulating trigger impulse can change the size of charging voltage and electric current, can satisfy the charging requirement of general storage battery and batteries, entire circuit is simple in structure, and working stability is reliable.

Background technology

At present, common controllable silicon charging circuit has following several mode, a kind of mode is to trigger the controllable silicon conducting once in several cycle internal trigger pulses of AC power with certain angle of flow, the height of output voltage is these mean values that pass through the pulse voltage behind the controllable silicon, by adjusting the size that the angle of flow or turn-on cycle change charging voltage and charging current, when charging by this way, the transient fluctuation of voltage is bigger, impact to electrical network is also bigger, generally only is applicable to the batteries of high voltage; Another kind of mode is to be added on the controllable silicon as charge power supply after by transformer supply voltage being reduced to certain value earlier, thereby change the size that silicon controlled conducting number of times changes charging current by changing the frequency or the angle of flow that trigger arteries and veins, though this mode can reduce surge voltage, but overall volume and weight increase, and the battery tension of adaptation is limited in scope.

Summary of the invention

Adopt the controllable silicon charging modes to realize the storage battery and the batteries of various electric pressures are charged for making, the utility model provides a kind of controllable silicon charging circuit, not only charging voltage and electric current are arbitrarily adjustable for it, be applicable to the storage battery of multiple voltage grade or the charging of batteries, and electrical network there is not impact, the charging voltage fluctuation is little, simple in structure.

The technical scheme that its technical problem that solves the utility model adopts is: after utilizing an auto-type transformer that supply voltage is transformed into the required low voltage of control circuit earlier, one the tunnel through diode rectification and filtering, voltage stabilizing circuit provides stable direct-current working volts for circuits for triggering, another road offers the sampling shaping circuit as sampled signal after by diode rectification, shaping circuit is to be made of comparator circuit, the purpose that adopts autotransformer is to make sampled signal and supply voltage keep changing synchronously and make trigger impulse and supply voltage maintenance common mode, thereby makes trigger impulse can directly remove to trigger controllable silicon; After sampled signal is sent into control circuit, at first the shaping circuit that is made of comparator by the first order carries out the shaping processing, with the signal transformation one-tenth with it corresponding square-wave signal of sampled signal by sinusoidal wave half-wave waveform, and then square-wave signal is carried out differential handle, being transformed into sawtooth signal is added on the shaping circuit that the second level is made of comparator, the height of the threshold voltage by changing second utmost point comparator can change the pulse duration of the square wave of its output, and the variation of the square wave pulse duration of output just shows as the variation of the zero-time of impulse wave, therefore, remove to trigger controllable silicon with the pulse of second level shaping circuit output and just can change the silicon controlled angle of flow, thereby can change the size of charging voltage and electric current.If the reference edge at second level comparator adds delay capacitor, make the threshold voltage of comparator after energized, progressively be reduced to the reference potential that sets by high potential near supply voltage, the trigger pulse width of its output will progressively increase to set point by zero, final result makes the voltage of controllable silicon output and electric current increase to set point gradually, the soft start purpose of realization control circuit from zero.

The beneficial effects of the utility model are, can make charging circuit can directly be suitable for the storage battery of various different electric pressures and the charging of batteries, the big I of charging current is arbitrarily set, and electrical network there is not impact in charge initiation moment, voltage, current stabilization are reliable, need not more powerful supporting power transformer and pulse-triggered transformer, in light weight, simple in structure.

The drawing explanation

Below in conjunction with drawings and Examples the utility model is further specified.

Accompanying drawing is circuit theory diagrams of the present utility model.

T is an autotransformer among the figure, and L is a filter inductor, and U1 is an integrated regulator, and U2A and U2B are the integrated circuit comparator unit, SCR is an one-way SCR, and BAT is a storage battery, and Q is a triode, R1～R10 is a resistor, and C1～C5 is a capacitor, and D1～D6 is a diode.

Embodiment

In the accompanying drawings, AC power is from L, after 2 inputs of N, one the tunnel through the filtering inductance L, rectifier diode D6, unidirectional controllable silicon S CR is added on the storage battery, another road is by the step-down of autotransformer, obtaining a lower voltage from its tap winding is added on the control circuit, in control circuit, D1, C1, C2, U1 constitutes the rectifying and wave-filtering and the voltage stabilizing circuit of power supply, be mainly control circuit stable working power is provided, R1, R2, U2A constitutes first order shaping circuit, R6, Rp, R8, U2B constitutes second level shaping circuit, R5, C3, D3, D4 constitutes integrating circuit, C4 is a soft start capacitor, R7, R9, Q constitutes controllable silicon and triggers drive circuit, D5, C5, R10 constitutes anti-jamming circuit; Through at first being undertaken after the halfwave rectifier again by R3 after the autotransformer step-down by D2 with the synchronous alternating voltage of AC power, R4 carries out dividing potential drop and is added on the in-phase input end of comparator U2A as sampled signal, sampled signal is by the shaping of first order shaping circuit, become corresponding with it square-wave signal to output on the integrating circuit by the signal transformation of sinusoidal wave half-wave waveform sampled signal from the output of comparator U2A, integrating circuit converts square-wave signal on the in-phase input end that sawtooth signal is added to the comparator U2B in the shaping circuit of the second level once more, sawtooth signal is passed through to form the silicon controlled triggering signal after the shaping for the second time, amplifies after-applied control controllable silicon work on the silicon controlled trigger electrode by drive circuit.Thereby the resistance of regulator potentiometer Rp can change the pulse duration that the threshold voltage of comparator U2B can change the rectangular pulse of U2B output, finally can change the angle of flow that controllable silicon touches, and realizes the control to charging voltage and electric current; Soft start capacitor device C4 is connected across the reference voltage terminal of comparator U2B, after the start, the characteristics of utilizing the voltage at capacitor two ends not suddenly change, make the reference voltage of comparator drop to the reference voltage point that sets by Rp from high potential gradually near working power voltage, the pulse duration of the rectangular pulse by U2B shaping output correspondingly can progressively increase to the setting width by zero, the silicon controlled angle of flow is also just progressively increased by little, make by silicon controlled charging voltage and electric current and progressively be increased to set point, the realization soft start function from zero.

Claims (3)

1. controllable silicon charging circuit, utilize alternating current storage battery to be charged by silicon controlled control, it is characterized in that: the anode of rectifier diode (D2) is connected in autotransformer (T) tap, negative terminal is connected the in-phase input end of a comparator (U2A) through current-limiting resistance (R3), the in-phase input end of comparator (U2A) also is connected on the common ground end of circuit by a divider resistance (R4), the inverting input of comparator (U2A) is leaded up to upward, and inclined to one side resistance (R1) is connected on the positive supply of circuit, leading up to down, inclined to one side resistance (R2) is connected on the common ground end of circuit, the output of comparator (U2A) is connected to the anode of isolating diode (D4) by current-limiting resistance (R5), the negative terminal of isolating diode (D4) is connected the in-phase input end of another comparator (U2B), the in-phase input end of comparator (U2B) also is connected on the common ground end of circuit by a differential capacitance (C3), the inverting input of comparator (U2B) is leaded up to upward, and inclined to one side resistance (R6) is connected on the positive supply of circuit, lead up to that the output of comparator (U2B) is connected on the base stage of driving triode (Q) by current-limiting resistance (R7) on potentiometer (Rp) and the common ground end that is connected circuit after down inclined to one side resistance (R8) connect, the collector electrode that drives triode (Q) directly is connected with the positive supply of circuit, emitter process current-limiting resistance (R9) is connected to the anode of isolating diode (D5), and the negative terminal of isolating diode (D5) is connected the control of controllable silicon (SCR) and extremely goes up.

2. controllable silicon charging circuit according to claim 1, it is characterized in that: the two ends of autotransformer (T) are connected on the live wire and zero line of AC power, the tap terminals of autotransformer (T) connects the anode of rectifier diode (D2), and the common port of autotransformer (T) is connected on the common ground end of circuit.

3. controllable silicon charging circuit according to claim 1 is characterized in that: capacitor (C4) in last inclined to one side resistance (R6) the two ends parallel connection that connects on the inverting input of back one-level comparator (U2B).