CN101715265B - LED driving power supply control circuit and LED lamp by using same - Google Patents
LED driving power supply control circuit and LED lamp by using same Download PDFInfo
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- CN101715265B CN101715265B CN 200910188921 CN200910188921A CN101715265B CN 101715265 B CN101715265 B CN 101715265B CN 200910188921 CN200910188921 CN 200910188921 CN 200910188921 A CN200910188921 A CN 200910188921A CN 101715265 B CN101715265 B CN 101715265B
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Abstract
The invention relates to an LED driving power supply control circuit. The LED driving power supply control circuit comprises an EMI filter and rectifier module, a DC-DC isolation constant current driver module, an input under-voltage lag protection module, and an output current protection module, wherein the EMI filter and rectifier module is used for performing EMI filter and full-wave rectification on an alternating-current voltage input by a power supply to generate a direct-current voltage; the DC-DC isolation constant current driver module is used for processing the direct-current voltage so as to generate a constant output current for the work of the LED power supply; the input under-voltage lag protection module is used for clamping and splitting the direct-current voltage so as to generate an enable signal and controlling the DC-DC isolation constant current driver module to start or not to start according to the enable signal; and the output current protection module is used for detecting the constant output current and controlling the DC-DC isolation constant current driver module to stop generating the output current while the constant output current exceeds a current threshold. The invention also relates to an LED lamp. The LED driving power supply control circuit and the LED lamp realize the alternating-current inputting and constant-current outputting in a wide range and have the input clamping lag protection and the output overvoltage protection functions.
Description
Technical field
The present invention relates to lighting technical field, more particularly, relate to a kind of LED driving power control circuit and use the LED light fixture of this circuit.
Background technology
Therefore advantages such as that led light source has is energy-efficient, the life-span is long, low pressure is controlled are widely used in each lighting field.In actual applications, the drive current of led light source all has a direct impact luminous efficiency and life-span.
Consider the particularity of environment for use, boat-carrying supply network and common civil power are distinguished to some extent, and the boat-carrying electric power system may be given a plurality of load equipment power supplies simultaneously, cause the output voltage fluctuation bigger, make the output voltage fluctuation of boat-carrying electric power system bigger.Simultaneously, present marine LED light fixture only is applicable to the situation that input voltage range is narrower, and the led light source vibration resistance is poor, light efficiency is low, the life-span is short, maintenance cycle is short so cause, and the defencive function deficiency, and EMI disturbs big, is not suitable for aboard ship using for a long time.
Summary of the invention
The technical problem to be solved in the present invention is, at the above-mentioned defective of prior art, a kind of LED driving power control circuit is provided and uses the LED light fixture of this circuit.
One of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of LED driving power control circuit, it comprises:
EMI filtering and rectification module, thus its alternating voltage to the power supply input carries out EMI filtering and full-wave rectification produces a direct current voltage;
DC-DC isolates constant-current driven module, and it handles to produce a constant output electric current for led light source work with described direct voltage;
Import under-voltage sluggish protection module, thereby it carries out clamped and dividing potential drop to described direct voltage and produces an enable signal, and control described DC-DC according to described enable signal and isolate constant-current driven module and start or do not start;
The output current protection module, it detects described constant output electric current, and controls described DC-DC and isolate constant-current driven module and stop to produce described constant output electric current when described constant output electric current surpasses current threshold.
Further; the described LED driving power of the invention described above control circuit; also comprise the output over-voltage protection module; it detects the output voltage that described DC-DC isolates constant-current driven module, and controls described DC-DC isolation constant-current driven module and regulate described output voltage when described output voltage is higher than voltage threshold.
Further, the described LED driving power of the invention described above control circuit also comprises the overheat protector module, and it is controlled described DC-DC isolation constant-current driven module and stops to produce described constant output electric current when temperature surpasses temperature threshold.
Two of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of LED light fixture, it comprises LED driving power control circuit and led light source, and described LED driving power control circuit comprises:
EMI filtering and rectification module, thus its alternating voltage to the power supply input carries out EMI filtering and full-wave rectification produces a direct current voltage;
DC-DC isolates constant-current driven module, and it handles to produce a constant output electric current for led light source work with described direct voltage;
Import under-voltage sluggish protection module, thereby it carries out clamped and dividing potential drop to described direct voltage and produces an enable signal, and control described DC-DC according to described enable signal and isolate constant-current driven module and start or do not start;
The output current protection module, it detects described constant output electric current, and controls described DC-DC and isolate constant-current driven module and stop to produce described constant output electric current when described constant output electric current surpasses current threshold.
Further, the described LED light fixture of the invention described above, described LED driving power control circuit also comprises:
The output over-voltage protection module, it detects the output voltage that described DC-DC isolates constant-current driven module, and controls described DC-DC isolation constant-current driven module and regulate described output voltage when described output voltage is higher than voltage threshold;
The overheat protector module, it is controlled described DC-DC isolation constant-current driven module and stops to produce described constant output electric current when temperature surpasses temperature threshold.
Implement LED driving power control circuit of the present invention and use the LED light fixture of this circuit, have following beneficial effect:
1, provides an isolated constant current LED drive circuit of wide range AC voltage input, can realize interchange input and the constant current output of relative broad range in input AC 85VAC stable work in the 264VAC scope, made that led light source is luminous to be stablized;
2, have the under-voltage sluggish defencive function of input, guaranteed that effectively circuit is not damaged by high pressure, and had the output over-voltage protection function, have in circuit output and can effectively protect led light source when unusual, burn out avoiding;
3, have functions such as output over-voltage protection and overheat protector.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the block diagram of LED driving power control circuit of the present invention;
Fig. 2 is the block diagram of EMI filtering and rectification module among the present invention;
Fig. 3 is the block diagram that DC-DC isolates constant-current driven module among the present invention;
Fig. 4 is the circuit theory diagrams of LED driving power control circuit one embodiment of the present invention.
Embodiment
As shown in Figure 1, be the block diagram of LED driving power control circuit of the present invention.This LED driving power control circuit comprises EMI filtering and rectification module 1, DC-DC isolation constant-current driven module 2, the under-voltage sluggish protection module 3 of input, output current protection module 4, output over-voltage protection module 5 and overheat protector module 6.
Wherein, thus the alternating voltage of the 1 pair of power supply of EMI filtering and rectification module input carries out EMI filtering and full-wave rectification produces a direct current voltage.DC-DC isolates constant-current driven module 2 described direct voltage is handled to produce a constant output electric current for led light source work.Carry out clamped and dividing potential drop and produce an enable signal thereby import 3 pairs of described direct voltages of under-voltage sluggish protection module, and control described DC-DC according to described enable signal and isolate constant-current driven module 2 and start or do not start.The constant output electric current that 4 couples of DC-DC of output current protection module isolate constant-current driven module 2 outputs detects, and control DC-DC isolation constant-current driven module 2 stops to produce described constant output electric current when described constant output electric current surpasses current threshold.The output voltage that 5 couples of DC-DC of output over-voltage protection module isolate constant-current driven module 2 detects, and control DC-DC isolates the described output voltage of constant-current driven module 2 adjustings when described output voltage is higher than voltage threshold.Overheat protector module 6 control DC-DC when temperature surpasses temperature threshold isolates constant-current driven module 2 and stops to produce described constant output electric current.
As shown in Figure 2, be the block diagram of EMI filtering and rectification module among the present invention.This EMI filtering and rectification module 1 comprise protective tube 10, EMI filter circuit 11, rectifier bridge 12 and the pi type filter 13 that links to each other successively.Live wire end series connection protective tube 10 in the power supply input, can prevent that moment overvoltage or thunderbolt .EMI filter circuit from can suppress electric network noise effectively, string mould, common mode disturbances are all played inhibitory action, both external electromagnetic interference of introducing from the power line of input AC of filtering, can avoid again itself sending noise jamming to the outside, improve antijamming capability and the reliability of LED driving power control circuit.Output at rectifier bridge is provided with pi type filter, can improve the compatibility of EMC.
As shown in Figure 3, be the block diagram that DC-DC isolates constant-current driven module among the present invention.This DC-DC isolates constant-current driven module 2 and comprises PWM ON-OFF control circuit 21, transformer 22 and filter circuit 23.Wherein, thereby PWM ON-OFF control circuit 21 is controlled its switch inside pipe conductings or is ended and produces first pwm signal, 22 pairs of first pwm signals of transformer are coupled and produce second pwm signal, and 23 pairs of second pwm signals of filter circuit carry out smothing filtering to produce described constant output electric current.
As shown in Figure 4, be the circuit theory diagrams of LED driving power control circuit one embodiment of the present invention.In the present embodiment, this LED driving power control circuit comprises EMI filtering and rectification module 1, DC-DC isolation constant-current driven module 2, the under-voltage sluggish protection module 3 of input, output current protection module 4, output over-voltage protection module 5 and overheat protector module 6.In the present embodiment, AC-input voltage can be in any selection of 85VAC to 264VAC.
EMI filtering and rectification module 1 comprise protective tube F1, EMI filter circuit 11, rectifier bridge 12 and the pi type filter 13 that links to each other successively.
The EMI filter circuit comprises piezo-resistance VR1, resistance R 33, resistance R 32, capacitor C X1, capacitor C X2, capacitor C Y1, capacitor C Y2, capacitor C Y3, capacitor C Y4, the first common mode choke coil L1, the second common mode choke coil L2L2, inductance L 1 and inductance L 2.First end of protective tube F1 is connected to the live wire end L of power supply input, second end of protective tube F1 is connected to the end of first coil of the first common mode choke coil L1, the head end of first coil of the first common mode choke coil L1 is connected to the head end of first coil of the second common mode choke coil L2, the end of first coil of the second common mode choke coil L2 is connected to first end of inductance L 1, and second end of inductance L 1 is connected to the input anode of rectifier bridge; The end of second coil of the first common mode choke coil L1 is connected to the zero line side N of power supply input, the head end of second coil of the first common mode choke coil L1 is connected to the head end of second coil of the second common mode choke coil L2, the end of second coil of the second common mode choke coil L2 is connected to first end of inductance L 2, and second end of inductance L 2 is connected to the input cathode of rectifier bridge; Piezo-resistance VR1 is connected between the end of second coil of the end of first coil of the first common mode choke coil L1 and the first common mode choke coil L1; Be connected after 32 series connection of resistance R 33 and resistance R between the end of second coil of the end of first coil of the first common mode choke coil L1 and the first common mode choke coil L1; Capacitor C X1 is connected between the end of second coil of the end of first coil of the first common mode choke coil L1 and the first common mode choke coil L1; Be connected between the end of second coil of the end of first coil of the first common mode choke coil L1 and the first common mode choke coil L1 tie point ground protection of capacitor C Y1 and capacitor C Y2 after capacitor C Y1 and the capacitor C Y2 series connection; Be connected between the head end of second coil of the head end of first coil of first common mode choke coil and first common mode choke coil tie point ground protection of capacitor C Y3 and capacitor C Y4 after capacitor C Y3 and the capacitor C Y4 series connection; Capacitor C X2 is connected between the end of second coil of the end of first coil of the second common mode choke coil L2 and the second common mode choke coil L2.
Pi type filter comprises capacitor C 1, capacitor C 2 and inductance L 7; First end of inductance L 7 is connected to the output head anode of rectifier bridge, the negative pole of output end ground connection of rectifier bridge; Capacitor C 1 is connected between first end and ground of inductance L 7; Capacitor C 2 is connected between second end and ground of inductance L 7; And, at the second end output dc voltage of inductance L 7.
DC-DC isolates constant-current driven module 2 and comprises PWM ON-OFF control circuit, transformer T1 and filter circuit.Thereby the PWM ON-OFF control circuit adopts PWM controller U1 control switch pipe Q1 conducting or ends and produces first pwm signal; Transformer T1 is coupled to first pwm signal and produces second pwm signal; Filter circuit carries out smothing filtering to produce the constant output electric current to second pwm signal, makes luminous stable, the brightness constancy of led light source, has reduced kopiopia, has improved the fail safe in the use.The PWM controller U1 here can adopt mosfet driver, is IRIS4015 such as model, IR2153 etc.
The shunting a reference source of importing that under-voltage sluggish protection module 3 comprises voltage-stabiliser tube ZD100, triode Q100, triode Q101, the one or three end is adjustable, capacitor C 100, capacitor C 101, capacitor C 102, resistance R 100, resistance R 101, resistance R 102, resistance R 103, resistance R 104, resistance R 105, resistance R 106, resistance R 107, resistance R 108, resistance R 109, resistance R 110 and resistance R 111.In the present embodiment, shunting a reference source that the one or three end is adjustable adopts the TL431 chip.
First end of resistance R 100 is connected to second end of inductance L 7, second end of resistance R 100 is connected to the collector electrode of triode Q100 successively by resistance R 101, resistance R 102, resistance R 103, resistance R 109 is connected between the emitter of the base stage of triode Q100 and triode Q100, the grounded emitter of triode Q100, resistance R 104 are connected between the emitter of the collector electrode of triode Q100 and triode Q100; First end of resistance R 105 is connected to second end of inductance L 7, and second end of resistance R 105 is connected to the negative pole of voltage-stabiliser tube ZD100 successively by resistance R 106, the plus earth of voltage-stabiliser tube ZD100, and electric capacity 102 is connected the two ends of voltage-stabiliser tube ZD100; First end of resistance R 107 is connected to the negative pole of voltage-stabiliser tube ZD100, second end of resistance R 107 is connected to the negative electrode of TL431 chip, the plus earth of TL431 chip, the reference edge of TL431 chip is connected to resistance R 102 and resistance R 103 interface points, and capacitor C 100 is connected between the anode of the reference edge of TL431 chip and TL431 chip; First end of resistance R 108 is connected to the negative electrode of TL431 chip, and second end of resistance R 108 is connected to the base stage of triode Q100; First end of resistance R 108 is connected to the base stage of triode Q101 by resistance R 110, the grounded emitter of triode Q101, and resistance R 111 is connected between the base stage and emitter of triode Q101; Capacitor C 101 is connected between the negative electrode and ground of TL431 chip.In the present embodiment, the direct voltage of using the EMI filtering of voltage-stabiliser tube ZD100 and rectification module 1 output carries out clamped and dividing potential drop, when AC-input voltage is 85VAC to 264VAC, voltage-stabiliser tube can provide the clamped voltage of a 20V, both provided operating voltage for the TL431 chip, enable level generation enable signal thereby be convenient to again produce, when enabling level with the direct generation of avoiding being exported by EMI filtering and rectification module 1 of direct voltage DC-DC is isolated the influence that constant-current driven module 2 startups bring.
Import the concussion that causes when under-voltage sluggish protection module 3 can prevent from exchanging the input fluctuation effectively, be damaged to prevent power supply.When the alternating voltage of power supply input rose to 82VAC from 0V, the control level of TL431 chip was less than 2.5V, and CTRL1 is high level, and the voltage of CTRL is less than 1V, and DC-DC isolates constant-current driven module 2 and do not start, and plays the under-voltage sluggish protective effect of input.When the alternating voltage of power supply input was higher than 82VAC, the control level of TL431 chip was greater than 2.5V, and CTRL1 is low level, and the voltage of CTRL is greater than 1V, and DC-DC isolates constant-current driven module 2 startup work.When the alternating voltage of power supply input is reduced to less than 79VAC from normal voltage; the control level of TL431 chip is less than 2.5V, and CTRL1 is high level, and the voltage of CTRL is less than 1V; DC-DC isolates constant-current driven module 2 and does not start, and plays the under-voltage sluggish protective effect of input.
As seen, present embodiment provides an isolated constant current LED drive circuit of wide range AC voltage input, can be in input AC 85VAC stable work in the 264VAC scope, can avoid damaging external light fixture because of power supply input instability, make the led light source life-span have the characteristic of anti-frequent switch up to more than 60,000 hours.
The constant output electric current that 4 couples of DC-DC of output current protection module isolate constant-current driven module 2 detects, and only produces the constant output electric current at the constant output electric current above current threshold time control stop.For example; when led light source is short-circuited; the output current that output current protection module 4 detects DC-DC isolation constant-current driven module 2 has surpassed current threshold, and output current protection module 4 will be controlled DC-DC isolation constant-current driven module 2 and stop to produce the constant output electric current, thus the protection led light source.
Output over-voltage protection module 5 comprises sample circuit, the two or three end is adjustable shunting a reference source U5, optocoupler U4 and peripheral circuit thereof.Sample circuit is gathered constant output voltage and is obtained a voltage sample value; and the reference voltage that voltage sample value and the adjustable shunting a reference source of the two or three end U5 provide compared; produce an overvoltage protection control signal and be sent to DC-DC through optocoupler U4 when the voltage sample value is higher than reference voltage and isolate constant-current driven module 2, DC-DC isolates constant-current driven module 2 and regulates final output voltage according to this overvoltage protection control signal.As seen, LED driving power control circuit of the present invention has when unusual in output, can protect external led light source effectively.In the present embodiment, the reference voltage that provides with the adjustable shunting a reference source of the two or three end U5 is voltage threshold, certainly, reference voltage difference that shunting a reference source U5 provides that the two or three end is adjustable, corresponding voltage threshold is just corresponding different.
Overheat protector module 6 control DC-DC when temperature surpasses temperature threshold isolates constant-current driven module 2 and stops to produce the constant output electric current.For example, when the temperature that detects wiring board as thermistor TH1 surpassed temperature threshold, control DC-DC isolated constant-current driven module 2 and stops to produce the constant output electric current, and wiring board is damaged when preventing high temperature effectively.
The invention still further relates to a kind of LED light fixture, this LED light fixture comprises LED driving power control circuit and led light source, and optimum execution mode such as the above-mentioned embodiment of this LED driving power control circuit set forth.
Below only be embodiments of the invention, not in order to limiting the present invention, all any modifications of in the spirit and principles in the present invention, doing, be equal to and replace or improvement etc., all should be included in protection scope of the present invention.
Claims (8)
1. a LED driving power control circuit is characterized in that, comprising:
EMI filtering and rectification module, thus its alternating voltage to the power supply input carries out EMI filtering and full-wave rectification produces a direct current voltage;
DC-DC isolates constant-current driven module, and it handles to produce a constant output electric current for led light source work with described direct voltage;
Import under-voltage sluggish protection module, thereby it carries out clamped and dividing potential drop to described direct voltage and produces an enable signal, and control described DC-DC according to described enable signal and isolate constant-current driven module and start or do not start;
The output current protection module, it detects described constant output electric current, and controls described DC-DC and isolate constant-current driven module and stop to produce described constant output electric current when described constant output electric current surpasses current threshold;
Described DC-DC isolates constant-current driven module and comprises PWM ON-OFF control circuit, transformer and filter circuit;
Thereby described PWM ON-OFF control circuit is controlled its switch inside pipe conducting or is ended and produces first pwm signal;
Described transformer is coupled to first pwm signal and produces second pwm signal;
Described filter circuit carries out smothing filtering to produce described constant output electric current to second pwm signal;
Wherein, shunting a reference source that the under-voltage sluggish protection module of described input comprises voltage-stabiliser tube ZD100, triode Q100, triode Q101, the one or three end is adjustable, capacitor C 100, capacitor C 101, capacitor C 102, resistance R 100, resistance R 101, resistance R 102, resistance R 103, resistance R 104, resistance R 105, resistance R 106, resistance R 107, resistance R 108, resistance R 109, resistance R 110 and resistance R 111;
First end of resistance R 100 is connected to second end of inductance L 7, second end of resistance R 100 is connected to the collector electrode of triode Q100 successively by resistance R 101, resistance R 102, resistance R 103, resistance R 109 is connected between the emitter of the base stage of triode Q100 and triode Q100, the grounded emitter of triode Q100, resistance R 104 are connected between the emitter of the collector electrode of triode Q100 and triode Q100;
First end of resistance R 105 is connected to second end of inductance L 7, and second end of resistance R 105 is connected to the negative pole of voltage-stabiliser tube ZD100 successively by resistance R 106, the plus earth of voltage-stabiliser tube ZD100, and electric capacity 102 is connected the two ends of voltage-stabiliser tube ZD100; First end of resistance R 107 is connected to the negative pole of voltage-stabiliser tube ZD100, second end of resistance R 107 is connected to the negative electrode of the adjustable shunting a reference source of the one or three end, the plus earth of shunting a reference source that the one or three end is adjustable, the reference edge of shunting a reference source that the one or three end is adjustable is connected to resistance R 102 and resistance R 103 interface points, and capacitor C 100 is connected between the anode of the reference edge of the adjustable shunting a reference source of the one or three end and the adjustable shunting a reference source of the one or three end; First end of resistance R 108 is connected to the negative electrode of the adjustable shunting a reference source of the one or three end, and second end of resistance R 108 is connected to the base stage of triode Q100; First end of resistance R 108 is connected to the base stage of triode Q101 by resistance R 110, the grounded emitter of triode Q101, and resistance R 111 is connected between the base stage and emitter of triode Q101; Capacitor C 101 is connected between the negative electrode and ground of the adjustable shunting a reference source of the one or three end.
2. LED driving power control circuit according to claim 1 is characterized in that, also comprises:
The output over-voltage protection module, it detects the output voltage that described DC-DC isolates constant-current driven module, and controls described DC-DC isolation constant-current driven module and regulate described output voltage when described output voltage is higher than voltage threshold.
3. LED driving power control circuit according to claim 1 is characterized in that, also comprises the overheat protector module, and it is controlled described DC-DC isolation constant-current driven module and stops to produce described constant output electric current when temperature surpasses temperature threshold.
4. LED driving power control circuit according to claim 1 is characterized in that, described EMI filtering and rectification module comprise protective tube, EMI filter circuit, rectifier bridge and the pi type filter that links to each other successively.
5. LED driving power control circuit according to claim 4, it is characterized in that described EMI filter circuit comprises piezo-resistance, resistance R 33, resistance R 32, capacitor C X1, capacitor C X2, capacitor C Y1, capacitor C Y2, capacitor C Y3, capacitor C Y4, first common mode choke coil, second common mode choke coil, inductance L 1 and inductance L 2;
First end of described protective tube is connected to the live wire end of power supply input, second end of described protective tube is connected to the end of first coil of first common mode choke coil, the head end of first coil of first common mode choke coil is connected to the head end of first coil of second common mode choke coil, the end of first coil of second common mode choke coil is connected to first end of inductance L 1, and second end of inductance L 1 is connected to the input anode of described rectifier bridge; The end of second coil of first common mode choke coil is connected to the zero line side of power supply input, the head end of second coil of first common mode choke coil is connected to the head end of second coil of second common mode choke coil, the end of second coil of second common mode choke coil is connected to first end of inductance L 2, and second end of inductance L 2 is connected to the input cathode of described rectifier bridge; Piezo-resistance is connected between the end of second coil of the end of first coil of first common mode choke coil and first common mode choke coil; Be connected after 32 series connection of resistance R 33 and resistance R between the end of second coil of the end of first coil of first common mode choke coil and first common mode choke coil; Capacitor C X1 is connected between the end of second coil of the end of first coil of first common mode choke coil and first common mode choke coil; Be connected between the end of second coil of the end of first coil of first common mode choke coil and first common mode choke coil tie point ground protection of capacitor C Y1 and capacitor C Y2 after capacitor C Y1 and the capacitor C Y2 series connection; Be connected between the head end of second coil of the head end of first coil of first common mode choke coil and first common mode choke coil tie point ground protection of capacitor C Y3 and capacitor C Y4 after capacitor C Y3 and the capacitor C Y4 series connection; Capacitor C X2 is connected between the end of second coil of the end of first coil of second common mode choke coil and second common mode choke coil;
Described pi type filter comprises capacitor C 1, capacitor C 2 and inductance L 7; First end of inductance L 7 is connected to the output head anode of described rectifier bridge, the negative pole of output end ground connection of described rectifier bridge; Capacitor C 1 is connected between first end and ground of inductance L 7; Capacitor C 2 is connected between second end and ground of inductance L 7; And, export described direct voltage at second end of inductance L 7.
6. LED driving power control circuit according to claim 1; it is characterized in that; described output over-voltage protection module comprises sample circuit; shunting a reference source that the two or three end is adjustable; optocoupler and peripheral circuit thereof; described sample circuit is gathered described output voltage and is obtained a voltage sample value; and the reference voltage that described voltage sample value and the adjustable shunting a reference source of described the two or three end provide compared; produce an overvoltage protection control signal and be sent to described DC-DC through described optocoupler when described voltage sample value is higher than described reference voltage and isolate constant-current driven module, described DC-DC isolates constant-current driven module and regulates described output voltage according to described overvoltage protection control signal.
7. a LED light fixture comprises LED driving power control circuit and led light source, it is characterized in that,
Described LED driving power control circuit comprises:
EMI filtering and rectification module, thus its alternating voltage to the power supply input carries out EMI filtering and full-wave rectification produces a direct current voltage;
DC-DC isolates constant-current driven module, and it handles to produce a constant output electric current for led light source work with described direct voltage;
Import under-voltage sluggish protection module, thereby it carries out clamped and dividing potential drop to described direct voltage and produces an enable signal, and control described DC-DC according to described enable signal and isolate constant-current driven module and start or do not start;
The output current protection module, it detects described constant output electric current, and controls described DC-DC and isolate constant-current driven module and stop to produce described constant output electric current when described constant output electric current surpasses current threshold;
Described DC-DC isolates constant-current driven module and comprises PWM ON-OFF control circuit, transformer and filter circuit;
Thereby described PWM ON-OFF control circuit is controlled its switch inside pipe conducting or is ended and produces first pwm signal;
Described transformer is coupled to first pwm signal and produces second pwm signal;
Described filter circuit carries out smothing filtering to produce described constant output electric current to second pwm signal;
Wherein, shunting a reference source that the under-voltage sluggish protection module of described input comprises voltage-stabiliser tube ZD100, triode Q100, triode Q101, the one or three end is adjustable, capacitor C 100, capacitor C 101, capacitor C 102, resistance R 100, resistance R 101, resistance R 102, resistance R 103, resistance R 104, resistance R 105, resistance R 106, resistance R 107, resistance R 108, resistance R 109, resistance R 110 and resistance R 111;
First end of resistance R 100 is connected to second end of inductance L 7, second end of resistance R 100 is connected to the collector electrode of triode Q100 successively by resistance R 101, resistance R 102, resistance R 103, resistance R 109 is connected between the emitter of the base stage of triode Q100 and triode Q100, the grounded emitter of triode Q100, resistance R 104 are connected between the emitter of the collector electrode of triode Q100 and triode Q100;
First end of resistance R 105 is connected to second end of inductance L 7, and second end of resistance R 105 is connected to the negative pole of voltage-stabiliser tube ZD100 successively by resistance R 106, the plus earth of voltage-stabiliser tube ZD100, and electric capacity 102 is connected the two ends of voltage-stabiliser tube ZD100; First end of resistance R 107 is connected to the negative pole of voltage-stabiliser tube ZD100, second end of resistance R 107 is connected to the negative electrode of the adjustable shunting a reference source of the one or three end, the plus earth of shunting a reference source that the one or three end is adjustable, the reference edge of shunting a reference source that the one or three end is adjustable is connected to resistance R 102 and resistance R 103 interface points, and capacitor C 100 is connected between the anode of the reference edge of the adjustable shunting a reference source of the one or three end and the adjustable shunting a reference source of the one or three end; First end of resistance R 108 is connected to the negative electrode of the adjustable shunting a reference source of the one or three end, and second end of resistance R 108 is connected to the base stage of triode Q100; First end of resistance R 108 is connected to the base stage of triode Q101 by resistance R 110, the grounded emitter of triode Q101, and resistance R 111 is connected between the base stage and emitter of triode Q101; Capacitor C 101 is connected between the negative electrode and ground of the adjustable shunting a reference source of the one or three end.
8. LED light fixture according to claim 7 is characterized in that, described LED driving power control circuit also comprises:
The output over-voltage protection module, it detects the output voltage that described DC-DC isolates constant-current driven module, and controls described DC-DC isolation constant-current driven module and regulate described output voltage when described output voltage is higher than voltage threshold;
The overheat protector module, it is controlled described DC-DC isolation constant-current driven module and stops to produce described constant output electric current when temperature surpasses temperature threshold.
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| CN 200910188921 CN101715265B (en) | 2009-12-14 | 2009-12-14 | LED driving power supply control circuit and LED lamp by using same |
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| CN 200910188921 CN101715265B (en) | 2009-12-14 | 2009-12-14 | LED driving power supply control circuit and LED lamp by using same |
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| CN101715265B true CN101715265B (en) | 2013-08-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10342078B2 (en) | 2014-09-28 | 2019-07-02 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
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