CN201657413U - Semiconductor LED illuminating lamp driving circuit - Google Patents

Abstract

The utility model discloses a semiconductor LED illuminating lamp driving circuit which comprises an anti-surging circuit and a power supply circuit, wherein the anti-surging circuit is connected with a mains supply which outputs voltage to the power supply circuit after filtration and absorption of surge voltage signals by the anti-surging circuit, so as to supply power to the LED illuminating lamp in the power supply circuit. The semiconductor LED illuminating lamp driving circuit can be built in, has lower cost, is environment-friendly and durable, can be used by being directly connected with the mains supply, has wider voltage range, can effectively prevent the damage of surge voltage in a mains supply power grid on the LED illuminating lamp by the anti-surging circuit, and can conduct real-time adjustment on the voltage at two ends of the LED illuminating lamp by virtue of the second primary side of a transformer and a control triode so as to keep the voltage of the LED illuminating lamp to be stable, thus ensuring illuminating quality, and prolonging the service life of the LED illuminating lamp.

Description

Semiconductor LED lighting bulb drive circuit

Technical field

The utility model relates to field of electronic devices, and especially LED lighting bulb field specifically is a semiconductor LED lighting bulb drive circuit.

Background technology

At present the LED lighting bulb in the application of every field is more and more widely compared with traditional bulb and energy-saving bulb, and the LED bulb has long service life, be convenient to transportation and install, and is not afraid of vibration, need not consider heat radiation and the advantage of environmental protection.The LED bulb generally needs drive circuit, but tends to occur voltage jump in the utility grid, causes surge voltage, can damage the drive circuit of LED bulb, and then the LED bulb is damaged.

The utility model content

The purpose of this utility model provides a kind of semiconductor LED lighting bulb drive circuit, by anti-surge circuit, and the Voltage Feedback in the power supply circuits, can effectively make to be added in LED lighting bulb both end voltage and to keep stable.

In order to achieve the above object, the technical scheme that the utility model adopted is:

Semiconductor LED lighting bulb drive circuit, include anti-surge circuit and power supply circuits, it is characterized in that: described anti-surge circuit connects mains supply, described mains supply is by after anti-surge circuit filtering, absorbing the surge voltage signal, to the power supply circuits output voltage, give the power supply of the LED lighting bulb in the power supply circuits;

Described anti-surge circuit comprises the rectifier bridge that four diodes are formed, there is input lead to draw respectively on two inputs of described rectifier bridge node, be connected with the inductance of filtering on input lead, be connected with the resistance of filtering on another root input lead, the external mains supply of described input lead, also be electrically connected with the variable resistance of absorption surge voltage parallel with one another and the electric capacity of filtering between described two input leads, mains supply inputs to input lead, through described inductance, the filtering of resistance and electric capacity, and after the variable resistance absorption surge voltage, be delivered to rectifier bridge, described rectifier bridge converts the AC signal of civil power to the pulse direct current signal, be electrically connected with electrochemical capacitor between two output nodes of described rectifier bridge, described electrochemical capacitor is with the remaining AC signal filtering in the pulse direct current signal of rectifier bridge output, one of them output node of described rectifier bridge is also by lead ground connection, and another output node is connected with power supply circuits to power supply circuits output pulse direct current signal by output lead;

Described power supply circuits include transformer, first terminals on the former limit of first of described transformer are electrically connected with the output lead of described anti-surge circuit, introduce the pulse direct current signal, be electrically connected with mutual diode in series and resistance between first terminals on described first former limit and second terminals, also be parallel with electric capacity on the described resistance; The secondary two ends of described transformer are electrically connected with LED lighting bulb two terminals by the secondary lead respectively, power to the LED lighting bulb, also be connected with current-limiting resistance on the described secondary lead, the secondary two ends of described transformer also are connected with the filter circuit of diode in series and electrochemical capacitor formation;

Also comprise switching tube, described switching tube is the driving tube of transformer, the output lead of described anti-surge circuit is connected to the base stage of switching tube by resistance, the base stage of described switching tube is also passed through grounding through resistance, the emitter of switching tube is by grounding through resistance, and collector electrode is electrically connected with second terminals on first former limit of described transformer;

Also comprise the control triode, two leads are arranged on the base stage of described control triode, after being connected with electric capacity and resistance parallel with one another on the lead, be electrically connected with the emitter of described switching tube again, another root lead passes through grounding through resistance, the grounded emitter of described control triode, there are four leads to draw on the collector electrode, a lead is electrically connected with the base stage of described switching tube, second lead passes through grounding through resistance, the 3rd lead is connected to the resistance on the output lead of described anti-surge circuit, first terminals that the 4th lead electric capacity and resistance by mutual series connection is connected to second former limit of described transformer, first terminals on second former limit of described transformer are also by diode ground connection, second terminals on second former limit of described transformer are by filter capacitor ground connection, the voltage of second former limit of described transformer feedback transformer secondary, described control triode sends pwm control signal, the duty ratio of second former limit control pwm signal of transformer makes the output voltage of transformer secondary keep stable.

The utility model can be built-in, cost is lower, and is environmental and durable, can directly connect civil power and use, the voltage range broad, by anti-surge circuit, can prevent effectively that surge voltage in the utility grid is to the damage of LED lighting bulb, by second former limit of transformer and control triode, can adjust in real time the voltage at LED lighting bulb two ends, make the voltage of LED lighting bulb keep stable, thereby guarantee lighting quality, the useful life of improving the LED lighting bulb.

Description of drawings

Fig. 1 is the utility model circuit diagram.

Embodiment

Semiconductor LED lighting bulb drive circuit, include anti-surge circuit and power supply circuits, anti-surge circuit connects mains supply, and mains supply is by after anti-surge circuit filtering, absorbing the surge voltage signal, to the power supply circuits output voltage, give the power supply of the LED lighting bulb in the power supply circuits;

Anti-surge circuit comprises four diode D5, D6, D7, the rectifier bridge that D8 forms, there is input lead to draw respectively on two inputs of rectifier bridge node, be connected with the inductance L 1 of filtering on input lead, be connected with the resistance R 9 of filtering on another root input lead, the external mains supply of input lead, also be electrically connected with the variable resistance MOVE of absorption surge voltage parallel with one another and the capacitor C 2 of filtering between two input leads, mains supply inputs to input lead, through inductance L 1, the filtering of resistance R 9 and capacitor C 2, and after the variable resistance MOVE absorption surge voltage, be delivered to rectifier bridge, rectifier bridge converts the AC signal of civil power to the pulse direct current signal, be electrically connected with electrochemical capacitor C10 between two output nodes of rectifier bridge, electrochemical capacitor C10 is with the remaining AC signal filtering in the pulse direct current signal of rectifier bridge output, one of them output node of rectifier bridge is also by lead ground connection, and another output node is connected with power supply circuits to power supply circuits output pulse direct current signal by output lead;

Power supply circuits include transformer T1, first terminals 1 on first former limit of transformer T1 are electrically connected with the output lead of anti-surge circuit, introduce the pulse direct current signal, be electrically connected with mutual diode in series D1 and resistance R 2 between first terminals 1 on first former limit and second terminals 3, also be parallel with capacitor C 4 on the resistance R 2; The secondary two ends of transformer T1 are electrically connected with LED lighting bulb two terminals by the secondary lead respectively, power to the LED lighting bulb, also be connected with current-limiting resistance R8 on the secondary lead, the secondary two ends of transformer also are connected with the filter circuit of diode in series D2 and electrochemical capacitor C3 formation;

Also comprise switching tube Q1, switching tube Q1 is the driving tube of transformer T1, the output lead of anti-surge circuit is connected to the base stage of switching tube Q1 by resistance R 3, the base stage of switching tube Q1 is also by resistance R 4 ground connection, the emitter of switching tube Q1 is by resistance R 1 ground connection, and collector electrode is electrically connected with second terminals 5 on first former limit of transformer T1;

Also comprise control triode Q2, on the base stage of control triode Q2 two leads are arranged, after being connected with capacitor C parallel with one another 13 and resistance R 6 on the lead, emitter with switching tube Q1 is electrically connected again, another root lead is by resistance R 7, R10 ground connection, the grounded emitter of control triode Q2, there are four leads to draw on the collector electrode, a lead is electrically connected with the base stage of switching tube Q1, second lead is by resistance R 4 ground connection, the 3rd lead is connected to the resistance R 3 on the output lead of anti-surge circuit, first terminals 5 that the 4th lead capacitor C 1 and resistance R 5 by mutual series connection is connected to second former limit of transformer T1, first terminals 5 on second former limit of transformer T1 are also by diode D3 ground connection, second terminals 6 on second former limit of transformer T1 are by filter capacitor C6 ground connection, the voltage of second former limit of transformer T1 feedback transformer secondary, the control triode sends pwm control signal, the duty ratio of second former limit control pwm signal of transformer makes the output voltage of transformer secondary keep stable.

Variable resistance 275v MOVE has the effect of the surge voltage of absorption.Inductance L 1, resistance R 9, capacitor C 2 play considers the anti-interference effect of ripple.Diode D5～D8 plays rectified action, and interchange is become pulsating direct current, and capacitor C 10 strobes, and the Alternating Component after the rectification is removed.PWM is made of control triode Q2 and peripheral original paper thereof.Negative feedback is played on second former limit of transformer T1, the duty ratio of control PWM, thus the control output voltage size makes output voltage keep stable.Q1 is a switching tube, pulse transformer T1.Diode D2, capacitor C 3 play the rectifying and wave-filtering effect, offer high-power LED illuminating lamp bubble voltage, 8 metering functions of resistance R.

Claims (1)

1. semiconductor LED lighting bulb drive circuit, include anti-surge circuit and power supply circuits, it is characterized in that: described anti-surge circuit connects mains supply, described mains supply is by after anti-surge circuit filtering, absorbing the surge voltage signal, to the power supply circuits output voltage, give the power supply of the LED lighting bulb in the power supply circuits;

Described anti-surge circuit comprises the rectifier bridge that four diodes are formed, there is input lead to draw respectively on two inputs of described rectifier bridge node, be connected with the inductance of filtering on input lead, be connected with the resistance of filtering on another root input lead, the external mains supply of described input lead, also be electrically connected with the variable resistance of absorption surge voltage parallel with one another and the electric capacity of filtering between described two input leads, mains supply inputs to input lead, through described inductance, the filtering of resistance and electric capacity, and after the variable resistance absorption surge voltage, be delivered to rectifier bridge, described rectifier bridge converts the AC signal of civil power to the pulse direct current signal, be electrically connected with electrochemical capacitor between two output nodes of described rectifier bridge, described electrochemical capacitor is with the remaining AC signal filtering in the pulse direct current signal of rectifier bridge output, one of them output node of described rectifier bridge is also by lead ground connection, and another output node is connected with power supply circuits to power supply circuits output pulse direct current signal by output lead;

Described power supply circuits include transformer, first terminals on the former limit of first of described transformer are electrically connected with the output lead of described anti-surge circuit, introduce the pulse direct current signal, be electrically connected with mutual diode in series and resistance between first terminals on described first former limit and second terminals, also be parallel with electric capacity on the described resistance; The secondary two ends of described transformer are electrically connected with LED lighting bulb two terminals by the secondary lead respectively, power to the LED lighting bulb, also be connected with current-limiting resistance on the described secondary lead, the secondary two ends of described transformer also are connected with the filter circuit of diode in series and electrochemical capacitor formation;

Also comprise switching tube, described switching tube is the driving tube of transformer, the output lead of described anti-surge circuit is connected to the base stage of switching tube by resistance, the base stage of described switching tube is also passed through grounding through resistance, the emitter of switching tube is by grounding through resistance, and collector electrode is electrically connected with second terminals on first former limit of described transformer;

Also comprise the control triode, two leads are arranged on the base stage of described control triode, after being connected with electric capacity and resistance parallel with one another on the lead, be electrically connected with the emitter of described switching tube again, another root lead passes through grounding through resistance, the grounded emitter of described control triode, there are four leads to draw on the collector electrode, a lead is electrically connected with the base stage of described switching tube, second lead passes through grounding through resistance, the 3rd lead is connected to the resistance on the output lead of described anti-surge circuit, first terminals that the 4th lead electric capacity and resistance by mutual series connection is connected to second former limit of described transformer, first terminals on second former limit of described transformer are also by diode ground connection, second terminals on second former limit of described transformer are by filter capacitor ground connection, the voltage of second former limit of described transformer feedback transformer secondary, described control triode sends pwm control signal, the duty ratio of second former limit control pwm signal of transformer makes the output voltage of transformer secondary keep stable.

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