CN203523119U - Triode-based LED current ripple elimination drive circuit - Google Patents

Triode-based LED current ripple elimination drive circuit Download PDF

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Publication number
CN203523119U
CN203523119U CN201320671015.1U CN201320671015U CN203523119U CN 203523119 U CN203523119 U CN 203523119U CN 201320671015 U CN201320671015 U CN 201320671015U CN 203523119 U CN203523119 U CN 203523119U
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China
Prior art keywords
triode
drive circuit
led current
led
current ripples
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CN201320671015.1U
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孙顺根
何颖彦
于得水
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Shanghai semiconducto Limited by Share Ltd
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Shanghai Bright Power Semiconductor Co Ltd
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Abstract

The utility model discloses a triode-based LED current ripple elimination drive circuit. The LED current ripple elimination drive circuit has one end connected with an input source and the other end connected with an LED load. The LED current ripple elimination drive circuit comprises a filtering resistor. The filtering resistor is connected with a filtering capacitor, the filtering capacitor is connected with a base electrode of an amplification triode, the emission electrode of the amplification triode is connected with the base electrode of a power triode, the collector electrode of the amplification triode and the collector electrode of the power triode are connected with the input source, the emission electrode of the power triode is connected with the LED load, the filtering resistor and the filtering capacitor convert ripple voltage signals on an input capacitor into voltage signals, and the voltage signals drive the amplification triode and the power triode so as to enable the voltage and current on the LED load to be ripple-free DC signals.

Description

A kind of LED current ripples based on triode is eliminated drive circuit
Technical field
The utility model relates to a kind of LED drive circuit, relates in particular to a kind of LED current ripples based on triode and eliminates drive circuit.
Background technology
In prior art, common LED constant-current drive circuit as shown in fig. 1.High Power Factor LED constant-current drive circuit comprises LED driver 10, one filter capacitor C1 and a LED load of a constant current output, and this filter capacitor and LED load are directly in parallel.In order to realize High Power Factor, the composition that LED driver 10 output currents of described constant current output contain working frequency ripple wave, for example mains frequency is 50Hz, the ripple that the LED driver output current of constant current output contains 100Hz, voltage on filter capacitor C1 also has the ripple of 100Hz, equally, the electric current in LED load also contains the ripple of 100Hz, the stroboscopic that makes light output contain 100Hz.Under the LED of this low frequency stroboscopic lamp, work for a long time, can cause people's visual fatigue.
Utility model content
The problems referred to above that exist for solving prior art, the utility model provides a kind of LED current ripples based on triode to eliminate drive circuit.
In order to realize above-mentioned utility model object, the utility model discloses a kind of LED current ripples based on triode and eliminates drive circuit, one end that this LED current ripples is eliminated drive circuit connects an input source, the other end connects a LED load, this LED current ripples is eliminated drive circuit and is comprised a filter resistance, this filter resistance connects a filter capacitor, this filter capacitor connects the base stage of an amplifying triode, the emitter of this amplifying triode connects the base stage of a pliotron, the collector electrode of this amplifying triode is connected described input source with the collector electrode of this pliotron, the emitter of this pliotron connects this LED load, this filter resistance and this filter capacitor are converted into voltage signal by the ripple voltage signal in input capacitance, this voltage signal drives this amplifying triode and pliotron, making the voltage and current in this LED load is the direct current signal of a ripple-free.
Further, in order to guarantee circuit normal operation, also comprise a driving resistance between this filter capacitor and the base stage of this amplifying triode, this driving resistance for protecting this amplifying triode in the situation that this LED current ripples is eliminated driving circuit abnormality.
Further, this amplifying triode and this pliotron can be replaced by a Darlington triode.This pliotron can be replaced by a MOSFET pipe.
Further, this filter resistance and a voltage-stabiliser tube are in parallel, and this voltage-stabiliser tube is this filter capacitor quick charge while starting for eliminating drive circuit at this LED current ripples.
Further, this LED current ripples is eliminated between drive circuit and this input source and is also comprised an input capacitance, comprises a ripple voltage in this input capacitance.
Further, this input source is inverse-excitation type switch power-supply, step-down switching power supply or buck Switching Power Supply.
Compared with prior art, LED current ripples based on triode disclosed in the utility model is eliminated drive circuit, control intelligently the electric current of LED drive circuit, make electric current in LED load equal the average current of input current source, make voltage on pliotron equal the ripple composition of this filter capacitor voltage, making the voltage in LED load is the direct voltage of an approximate ripple-free, and LED load current is the direct current of an approximate ripple-free, reaches the object that LED current ripples is eliminated.
Accompanying drawing explanation
About advantage of the present utility model and spirit, can describe in detail and appended graphic being further understood by following utility model.
Fig. 1 is the High Power Factor LED constant-current drive circuit schematic diagram using in prior art;
Fig. 2 eliminates the schematic diagram of drive circuit according to the shown LED current ripples based on triode of the utility model;
Fig. 3 is according to the shown circuit working typical waveform of the utility model figure;
Fig. 4 eliminates the schematic diagram of drive circuit according to the LED current ripples based on triode of the shown flyback structure of the utility model High Power Factor;
Fig. 5 eliminates the schematic diagram of drive circuit according to the LED current ripples based on triode of the shown buck configuration High Power Factor of the utility model;
Fig. 6 eliminates the schematic diagram of another execution mode of drive circuit according to the LED current ripples based on triode of the shown buck configuration High Power Factor of the utility model;
Fig. 7 eliminates the schematic diagram of drive circuit according to the LED current ripples based on triode of the shown buck structure of the utility model High Power Factor.
Embodiment
Below in conjunction with accompanying drawing, describe specific embodiment of the utility model in detail.
In order to solve the power frequency ripple that in prior art, High Power Factor LED constant-current drive circuit produces, the purpose of this utility model is to provide a kind of LED drive circuit of eliminating this ripple.Technical scheme provided by the utility model, by eliminating the impact of this ripple on LED load current, makes LED load current realize very little working frequency ripple wave, realizes the object that LED current ripples is eliminated.This structure without stroboscopic LED driver as shown in Figure 2.Shown in the utility model without stroboscopic LED driver 200, this is connected between input capacitance C1 and load LED without stroboscopic LED driver 200.This comprises a filter resistance R1 without stroboscopic LED driver 200.One end of this filter resistance R1 connects input capacitance C1, and this filter resistance R1 and voltage-stabiliser tube ZD1 are in parallel, and the anodic bonding of this voltage-stabiliser tube is in the anode of input capacitance C1.Filter capacitor C2 is connected between filter resistance R1 and filter capacitor negative terminal.Filter capacitor C2 drives resistance R 2 to connect the base stage of amplifying triode Q1 by one, the collector electrode of this amplifying triode Q1 is connected in the anode of input capacitance C1, the emitting stage of amplifying triode Q1 connects the base stage of pliotron Q2, the collector electrode of this pliotron Q2 is also connected in the anode of input capacitance C1, and the emitter of pliotron Q2 connects LED load.
Input source is a LED driver with ripple current, such as active power is proofreaied and correct LED constant-flow driver, the ripple composition that contains 2 times of mains frequencies, input current source is after input capacitance C1 filtering, on input capacitance C1, produce a voltage, this voltage is also with the ripple of 2 times of mains frequencies.The purpose of this utility model is, eliminates the impact of this ripple on LED load current, makes LED load current realize very little working frequency ripple wave, realizes the object that LED current ripples is eliminated.
The time constant of filter resistance R1 and filter capacitor C2 is several power frequency periods, and the ripple voltage on input capacitance C1 is the filtering of resistance R 1 and filter capacitor C2 after filtering, produces the direct voltage of an approximate ripple-free on filter capacitor C2.This direct voltage passes through to drive resistance R 2 drive amplification triode Q1, the emitter current driving power triode Q2 of Q1, and Q1 plays the effect that improves current amplification factor.High two the PN junction voltages of voltage ratio LED load voltage on filter capacitor C2, about 1.2V left and right, because the approximate ripple-free of filter capacitor C2 voltage, so output LED load voltage is also similar to ripple-free.When input capacitance C1 voltage is during higher than LED load voltage, voltage V between pliotron Q2 collector electrode C and emitter E cEborn the ripple voltage composition on input capacitance C1, its power is dissipated by pliotron.
When circuit start, voltage-stabiliser tube ZD1 is filter capacitor C2 quick charge, plays the object of quick startup, and when steady operation, voltage-stabiliser tube ZD1 is inoperative, and the magnitude of voltage of voltage-stabiliser tube ZD1 need to be higher than the ripple voltage composition on input capacitance C1.
Drive resistance R 2 for amplifying triode Q1 plays a protective role, when circuit has abnormal conditions to occur, during as LED load short circuits, drive resistance R 2 restrictions to flow into the electric current of amplifying triode Q1 base stage, protection amplifying triode Q1 avoids damaging.
Fig. 3 is according to the shown circuit working typical waveform of the utility model.The working frequency ripple wave that voltage 301 on input capacitance C1 contains 2 times, voltage 303 on filter capacitor C2 is the direct voltage of an approximate ripple-free, LED load voltage 302 is than the voltage of low two PN junctions of voltage 303 on filter capacitor C2, and the minimum of input capacitance C1 voltage 301 is than the voltage of filter capacitor C2 voltage 303 low PN junctions.The electric current 304 of LED load equals the mean value of input source electric current, and is the direct current of an approximate ripple-free.
Fig. 4 is the embodiment that the LED current ripples based on triode is eliminated drive circuit according to the shown flyback structure of the utility model High Power Factor, and as shown in Figure 4, in this execution mode, input source is a flyback APFC LED driver 400.
Fig. 5 is the embodiment that the LED current ripples based on triode is eliminated drive circuit according to the shown buck configuration High Power Factor of the utility model, and as shown in Figure 5, in this execution mode, input source is a step-down APFC LED driver 500.
Fig. 6 is another embodiment that the LED current ripples based on triode is eliminated drive circuit according to the shown buck configuration High Power Factor of the utility model.LED current ripples disclosed in the utility model is eliminated drive circuit as the another kind of connected mode of step-down switching power supply, and wherein 600 is step-down APFC LED driver.
Fig. 7 is the embodiment that the LED current ripples based on triode is eliminated drive circuit according to the shown buck structure of the utility model High Power Factor, and wherein 700 is buck APFC LED driver.
Compared with prior art, LED current ripples based on triode disclosed in the utility model is eliminated drive circuit, control intelligently the electric current of LED drive circuit, make electric current in LED load equal the average current of input current source, make voltage on pliotron equal the ripple composition of this filter capacitor voltage, making the voltage in LED load is the direct voltage of an approximate ripple-free, and LED load current is the direct current of an approximate ripple-free, reaches the object that LED current ripples is eliminated.
Described in this specification is preferred embodiment of the present utility model, and above embodiment is only in order to the technical solution of the utility model to be described but not to restriction of the present utility model.All those skilled in the art comply with design of the present utility model by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be within scope of the present utility model.

Claims (7)

1. the LED current ripples based on triode is eliminated drive circuit, it is characterized in that, one end that described LED current ripples is eliminated drive circuit connects an input source, the other end connects a LED load, described LED current ripples is eliminated drive circuit and is comprised a filter resistance, described filter resistance connects a filter capacitor, described filter capacitor connects the base stage of an amplifying triode, the emitter of described amplifying triode connects the base stage of a pliotron, the collector electrode of described amplifying triode is connected described input source with the collector electrode of described pliotron, the emitter of described pliotron connects described LED load, described filter resistance and described filter capacitor are converted into voltage signal by the ripple voltage signal in input capacitance, described voltage signal drives described amplifying triode and pliotron, making the voltage and current in described LED load is the direct current signal of a ripple-free.
2. the LED current ripples based on triode as claimed in claim 1 is eliminated drive circuit; it is characterized in that; between described filter capacitor and the base stage of described amplifying triode, also comprise a driving resistance, described driving resistance for protecting described amplifying triode in the situation that described LED current ripples is eliminated driving circuit abnormality.
3. the LED current ripples based on triode as claimed in claim 1 is eliminated drive circuit, it is characterized in that, described amplifying triode and described pliotron can be replaced by a Darlington triode.
4. the LED current ripples based on triode as claimed in claim 1 is eliminated drive circuit, it is characterized in that, described pliotron can be replaced by a MOSFET pipe.
5. the LED current ripples based on triode as claimed in claim 1 is eliminated drive circuit, it is characterized in that, described filter resistance and a voltage-stabiliser tube are in parallel, and described voltage-stabiliser tube is described filter capacitor quick charge while starting for eliminating drive circuit at described LED current ripples.
6. the LED current ripples based on triode as claimed in claim 1 is eliminated drive circuit, it is characterized in that, described LED current ripples is eliminated between drive circuit and described input source and also comprised an input capacitance, comprises a ripple voltage in described input capacitance.
7. the LED current ripples based on triode as claimed in claim 1 is eliminated drive circuit, it is characterized in that, described input source is inverse-excitation type switch power-supply, step-down switching power supply or buck Switching Power Supply.
CN201320671015.1U 2013-10-29 2013-10-29 Triode-based LED current ripple elimination drive circuit Active CN203523119U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103533719A (en) * 2013-10-29 2014-01-22 上海晶丰明源半导体有限公司 Triode-based light-emitting diode (LED) current ripple elimination driving circuit
CN104093253A (en) * 2014-07-16 2014-10-08 浙江大学 Non-strobe isolated LED constant-current driving circuit
CN105636287A (en) * 2014-10-28 2016-06-01 帝奥微电子有限公司 Driving circuit with ripple current elimination and power consumption reducing
CN106658862A (en) * 2017-01-17 2017-05-10 厦门奇力微电子有限公司 Current ripple removal circuit and method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103533719A (en) * 2013-10-29 2014-01-22 上海晶丰明源半导体有限公司 Triode-based light-emitting diode (LED) current ripple elimination driving circuit
CN104093253A (en) * 2014-07-16 2014-10-08 浙江大学 Non-strobe isolated LED constant-current driving circuit
CN104093253B (en) * 2014-07-16 2016-04-06 浙江大学 A kind of without stroboscopic isolated form constant current driver circuit for LED
CN105636287A (en) * 2014-10-28 2016-06-01 帝奥微电子有限公司 Driving circuit with ripple current elimination and power consumption reducing
CN105636287B (en) * 2014-10-28 2018-09-18 帝奥微电子有限公司 The driving circuit of power consumption is eliminated and reduced with ripple current
CN106658862A (en) * 2017-01-17 2017-05-10 厦门奇力微电子有限公司 Current ripple removal circuit and method

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Address after: 5 room 504-511, room 2, Lane 666, Zhang Heng Road, Pudong New Area, China (Shanghai) free trade zone, Shanghai, China ()

Patentee after: Shanghai semiconducto Limited by Share Ltd

Address before: 201204 Shanghai city Pudong New Area in 299 Lane Road, No. 10

Patentee before: Shanghai Bright Power Semiconductor Co.,Ltd.

CP03 Change of name, title or address