CN108243529A - A kind of LED dimming driving circuits - Google Patents
A kind of LED dimming driving circuits Download PDFInfo
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- CN108243529A CN108243529A CN201611216993.1A CN201611216993A CN108243529A CN 108243529 A CN108243529 A CN 108243529A CN 201611216993 A CN201611216993 A CN 201611216993A CN 108243529 A CN108243529 A CN 108243529A
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- drive circuits
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- 238000001914 filtration Methods 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 241001465382 Physalis alkekengi Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Abstract
The invention discloses a kind of LED dimming driving circuits, including：RCC constant-current drive circuits, OVP backfeed loops and current acquisition backfeed loop；When output no-load, OVP backfeed loops are by the output voltage of RCC constant-current drive circuits compared with a reference voltage；When the output voltage of RCC constant-current drive circuits is more than reference voltage, the starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by OVP backfeed loops by conducting state so that the output voltage of RCC constant-current drive circuits reduces；When output no-load connects load, current acquisition backfeed loop acquires the output current of RCC constant-current drive circuits and compared with a reference current；When the output current of RCC constant-current drive circuits is more than reference current, the starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by current acquisition backfeed loop by conducting state so that the output current of RCC constant-current drive circuits reduces.
Description
Technical field
The present invention relates to a kind of electronic circuit of lighting apparatus, specifically a kind of dimming driving circuits for LED.
Background technology
With technological progress, the advantage of LED light source in illumination applications gradually highlights, on the one hand, its light efficiency, colour rendering
Even more than conventional light source such as incandescent lamp, gas discharge fluorescent lamp can be had reached, on the other hand, adjustability relatively passes
System light source has the development space of bigger, especially suitable for general illumination fields such as modern house, business.
But the lamps and lanterns that LED light source is realized also have the defects of its is apparent, it is contemplated that LED light source output semiconductor device,
Its driving power usually requires low pressure, so, LED lamp can all carry corresponding driver.This quasi-driver is often using opening
The power supply of pass mode, such as include switch transformer, oscillating circuit, protection circuit etc., it is contemplated that dimming function, precision and service life
The problems such as, some even applies to IC.The general character of this kind of circuit is that circuit is more complicated, and cost is higher, especially in middle low-power LED
It is difficult to promote the use of on desk lamp with dimmer switch.
Invention content
Technical problem underlying to be solved by this invention is to provide a kind of LED dimming driving circuits, at low cost, reliability
High, good compatibility.
In order to solve the technical issues of above-mentioned, the present invention provides a kind of LED dimming driving circuits, it is characterised in that packet
It includes：RCC constant-current drive circuits, OVP backfeed loops and current acquisition backfeed loop；
When output no-load, current acquisition backfeed loop does not work, and the OVP backfeed loops are by RCC constant-current drive circuits
Output voltage compared with a reference voltage；When the output voltage of RCC constant-current drive circuits is more than reference voltage, the OVP
Starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by backfeed loop by conducting state so that RCC constant currents
The output voltage of driving circuit reduces；
When output no-load connects load, the output voltage of RCC constant-current drive circuits is consistently less than the reference voltage of OVP,
The OVP backfeed loops do not work, the output current of current acquisition backfeed loop acquisition RCC constant-current drive circuits and with one
Reference current compares；When the output current of RCC constant-current drive circuits is more than reference current, the current acquisition backfeed loop will
Starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by conducting state so that RCC constant-current drive circuits
Output current reduces.
In a preferred embodiment：OVP backfeed loops include a comparator A1, and electrode input end connection is described with reference to electricity
Pressure, negative input are connected to the common end of resistance R2, R6 of series connection；Described resistance R2, R6 are connected in parallel on RCC constant-current drive circuits
Anode, between cathode output end；The output terminal of the comparator A1 is connected to the transmitting of the base stage of switching tube Q4, switching tube Q4
Pole is grounded, and collector is connected to the base stage of switching tube Q2；The emitter ground connection of the switching tube Q2, collector are connected to described open
The base stage of dynamic switching tube Q1.
In a preferred embodiment：The current acquisition backfeed loop includes comparator A2, electrode input end connection institute
Reference current is stated, cathode acquires the output current of RCC constant-current drive circuits by resistance LB1；The output terminal of the comparator A2
It is connect with the output terminal of comparator A1.
In a preferred embodiment：The RCC constant-current drive circuits include a mutual inductor, the one of input coil T1A
A input terminal is connected to the cathode output end of current rectifying and wave filtering circuit, another input terminal is connected to the collection of the starting switch pipe Q1
Electrode；The base stage of starting switch pipe is connected to the cathode output end of current rectifying and wave filtering circuit by a decompression network；Separately there is an auxiliary
Coil T1B, one end of the ancillary coil are connected to by an oscillating capacitance C5 in the decompression network；The oscillating capacitance it is another
One end is connected to the base stage of starting switch pipe Q1.
In a preferred embodiment：Two output terminals of the output winding T1C of the mutual inductor are respectively the RCC permanent
Flow the cathode output end and cathode output end of driving circuit.
In a preferred embodiment：The current rectifying and wave filtering circuit includes a bridge rectifier, has connection alternating current
Input terminal and DC terminal with anode and cathode；And a filter capacitor C2, it is connected to the anode and negative DC end
Between.
In a preferred embodiment：Freewheeling circuit is further included, which is connected to the anode and negative DC end
Between, a resistance R3 and a capacitance C3 including series connection.
In a preferred embodiment：The decompression network is resistance R4, R5, the R7 being connected in series with.
In a preferred embodiment：The cathode output end of the output winding T1C is connected in series with the resistance LB1.
Compared to the prior art, technical scheme of the present invention has following advantageous effect：
1. a kind of LED dimming driving circuits provided by the invention, OVP voltages are directly from the output of RCC constant-current drive circuits
End acquisition, feeds back to ratio amplifier, and bringing onto load output voltage and floating voltage difference can be done closer, and follower is greatly reduced
The electric stress of part, and no-load power consumption can be made small；
2. a kind of LED dimming driving circuits provided by the invention are transmitted to negative-feedback transport and placing device after output current sampling, lead to
Switching tube Q4 is crossed to adjust, it can be achieved that the control of high-precision output current, is not influenced by input voltage, solved traditional
The problem of RCC circuits cause corresponding output power also to increase because of the increase of input voltage；
3. after output terminal adds in comparator A1 and A2, can constant output voltage and electric current, line regulation can be accomplished
Within 3%；Compare with common light modulation IC, cost is lower, can be widely used to promote in LED illumination.
Description of the drawings
Fig. 1 is the circuit diagram of the preferred embodiment of the present invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
With reference to figure 1, a kind of LED dimming driving circuits, it is characterised in that including：RCC constant-current drive circuits, OVP are fed back to
Road and current acquisition backfeed loop；
When output no-load, current acquisition backfeed loop does not work, and the OVP backfeed loops are by RCC constant-current drive circuits
Output voltage compared with a reference voltage；When the output voltage of RCC constant-current drive circuits is more than reference voltage, the OVP
Starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by backfeed loop by conducting state so that RCC constant currents
The output voltage of driving circuit reduces；
When output no-load connects load, the output voltage of RCC constant-current drive circuits is consistently less than the reference voltage of OVP,
The OVP backfeed loops do not work, the output current of current acquisition backfeed loop acquisition RCC constant-current drive circuits and with one
Reference current compares；When the output current of RCC constant-current drive circuits is more than reference current, the current acquisition backfeed loop will
Starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by conducting state so that RCC constant-current drive circuits
Output current reduces.
Particular circuit configurations are as follows：OVP backfeed loops include a comparator A1, and electrode input end connection is described with reference to electricity
Pressure, negative input are connected to the common end of resistance R2, R6 of series connection；Described resistance R2, R6 are connected in parallel on RCC constant-current drive circuits
Anode, between cathode output end；The output terminal of the comparator A1 is connected to the transmitting of the base stage of switching tube Q4, switching tube Q4
Pole is grounded, and collector is connected to the base stage of switching tube Q2；The emitter ground connection of the switching tube Q2, collector are connected to described open
The base stage of dynamic switching tube Q1.
The current acquisition backfeed loop includes comparator A2, and electrode input end connects the reference current, and cathode leads to
Cross the output current of resistance LB1 acquisition RCC constant-current drive circuits；The output terminal of the comparator A2 and the output terminal of comparator A1
Connection.
The RCC constant-current drive circuits include a mutual inductor, and an input terminal of input coil T1A is connected to rectification
The cathode output end of filter circuit, another input terminal are connected to the collector of the starting switch pipe Q1；Starting switch pipe
Base stage is connected to the cathode output end of current rectifying and wave filtering circuit by a decompression network, and the decompression network is the resistance being connected in series with
R4、R5、R7.Separately there is an ancillary coil T1B, one end of the ancillary coil is connected to the decompression network by an oscillating capacitance C5
In；The other end of the oscillating capacitance is connected to the base stage of starting switch pipe Q1.
Two output terminals of the output winding T1C of the mutual inductor are respectively the anode of the RCC constant-current drive circuits
Output terminal and cathode output end.The cathode output end of the output winding T1C is connected in series with the resistance LB1.
The current rectifying and wave filtering circuit includes a bridge rectifier, has the input terminal of connection alternating current and with anode
With the DC terminal of cathode；And a filter capacitor C2, it is connected between the anode and negative DC end.
Freewheeling circuit is further included, which is connected between the anode and negative DC end, and one including series connection
A resistance R3 and capacitance C3；Its role is to when light modulator is adjusted to low side, maintain to the silicon-controlled electric current for providing bigger, make
It continues to conducting state, to improve the low side stroboscopic problem generated due to load current is too small.
The course of work is as described below：It is sent after filtering out AC network electromagnetic interference signal by filter circuit to bridge rectifier electricity
Alternating voltage is become pulsating dc voltage, reaches start-up circuit after the filtered capacitance C2 filtering of pulsating dc voltage, give by road
After C5 capacitor chargings, starting switch pipe Q1 is opened.The voltage of ancillary coil T1B sensings maintains starting switch pipe Q1 further to lead
It is logical, and quickly enter saturation conduction；As ancillary coil T1B current changing rates reduce so that the drive of starting switch pipe Q1 base stages
Kinetic force declines, and starting switch pipe Q1 will be forced to enter amplification region from saturation conduction, when the driving of starting switch pipe Q1 base stages
Ability further declines, and starting switch pipe Q1 will quickly enter cut-off region and turn off.
After the energy on output winding T1C is all discharged by LED load, start circuit and charged to C5 again so that opening
Dynamic bis- conductings of switching tube Q1.Loop cycle realizes line switching work in this way.
Hereafter, when output no-load, output current zero, comparator A2 does not acquire the output of RCC constant-current drive circuits
Electric current is without working；Clamper is carried out due to not having to load light emitting diode, on the output voltages of RCC constant-current drive circuits is linear
It rises, when output voltage reaches setting value (R2+R6) xVO/R2>During V_ref, comparator A1 outputs low level → so that switching tube Q4
The base current of starting switch pipe Q1 → so that starting switch pipe Q1, which ends, leads to major loop is taken in cut-off → switching tube Q2 conducting away
Shutdown → so as to reduce RCC crossing current driving circuit output voltages；As { (R2+R6) * VO }/R2<During V_ref, comparator A1 outputs
High level driving switch pipe Q4 conductings → switching tube Q2 base voltages drag down and end → switching tube Q1 conductings, thus period friendship
It replaces, constant floating voltage OVP.
When output connects load, since output voltage is less than OVP voltages, comparator A1 does not work, and comparator A2 passes through
Resistance LB1 acquires the output current of RCC constant-current drive circuits, when the output current of RCC constant-current drive circuits>V_SENSE*V_
Ref/ { during (V_SENSE+V_ref) * RS1, take away by comparator A2 outputs low level → switching tube Q4 cut-offs → switching tube Q2 conductings
The cut-off of the base current of starting switch pipe Q1 → starting switch pipe Q1 leads to major loop shutdown → so as to reduce output current, week and
It renews, plays the effect of constant output current.
The foregoing is only a preferred embodiment of the present invention, but the present invention design concept be not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, using this design carries out the present invention non-
Substantive change belongs to invade the behavior of the scope of the present invention.
Claims (9)
1. a kind of LED dimming driving circuits, it is characterised in that including：RCC constant-current drive circuits, OVP backfeed loops and electric current are adopted
Collect backfeed loop；
When output no-load, current acquisition backfeed loop does not work, and the OVP backfeed loops are by the defeated of RCC constant-current drive circuits
Go out voltage compared with a reference voltage；When the output voltage of RCC constant-current drive circuits is more than reference voltage, the OVP feedbacks
Starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by circuit by conducting state so that RCC constant currents drive
The output voltage of circuit reduces；
When output no-load connects load, the output voltage of RCC constant-current drive circuits is consistently less than the reference voltage of OVP, described
OVP backfeed loops do not work, and the output current of the current acquisition backfeed loop acquisition RCC constant-current drive circuits is simultaneously referred to one
Electric current compares；When the output current of RCC constant-current drive circuits is more than reference current, the current acquisition backfeed loop is by RCC
Starting switch pipe Q1 in constant-current drive circuit is switched to cut-off state by conducting state so that RCC constant-current drive circuits it is defeated
Go out current reduction.
2. a kind of LED dimming driving circuits according to claim 1, it is characterised in that：OVP backfeed loops compare including one
Device A1, electrode input end connect the reference voltage, and negative input is connected to the common end of resistance R2, R6 of series connection；Institute
Resistance R2, R6 is stated to be connected in parallel between the anode of RCC constant-current drive circuits, cathode output end；The output terminal of the comparator A1 connects
The base stage of switching tube Q4, the emitter ground connection of switching tube Q4 are connected to, collector is connected to the base stage of switching tube Q2；The switching tube
The emitter ground connection of Q2, collector are connected to the base stage of the starting switch pipe Q1.
3. a kind of LED dimming driving circuits according to claim 2, it is characterised in that：The current acquisition backfeed loop
Including comparator A2, electrode input end connects the reference current, and cathode acquires RCC constant-current drive circuits by resistance LB1
Output current；The output terminal of the comparator A2 is connect with the output terminal of comparator A1.
4. a kind of LED dimming driving circuits according to claim 3, it is characterised in that：The RCC constant-current drive circuits packet
A mutual inductor is included, an input terminal of input coil T1A is connected to the cathode output end of current rectifying and wave filtering circuit, another is defeated
Enter the collector that end is connected to the starting switch pipe Q1；The base stage of starting switch pipe is connected to rectification by a decompression network and filters
The cathode output end of wave circuit；Separately there is an ancillary coil T1B, one end of the ancillary coil is connected to institute by an oscillating capacitance C5
It states in decompression network；The other end of the oscillating capacitance is connected to the base stage of starting switch pipe Q1.
5. a kind of LED dimming driving circuits according to claim 4, it is characterised in that：The output line of the mutual inductor
Two output terminals of circle T1C are respectively the cathode output end and cathode output end of the RCC constant-current drive circuits.
6. a kind of LED dimming driving circuits according to claim 5, it is characterised in that：The current rectifying and wave filtering circuit includes
One bridge rectifier has the input terminal of connection alternating current and the DC terminal with anode and cathode；An and filter capacitor
C2 is connected between the anode and negative DC end.
7. a kind of LED dimming driving circuits according to claim 6, it is characterised in that：Freewheeling circuit is further included, the afterflow
Circuit is connected between the anode and negative DC end, a resistance R3 and a capacitance C3 including series connection.
8. a kind of LED dimming driving circuits according to claim 7, it is characterised in that：The decompression network connects for series connection
Resistance R4, R5, the R7 connect.
9. a kind of LED dimming driving circuits according to claim 7, it is characterised in that：The cathode of the output winding T1C
Output terminal is connected in series with the resistance LB1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611216993.1A CN108243529A (en) | 2016-12-26 | 2016-12-26 | A kind of LED dimming driving circuits |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611216993.1A CN108243529A (en) | 2016-12-26 | 2016-12-26 | A kind of LED dimming driving circuits |
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| CN108243529A true CN108243529A (en) | 2018-07-03 |
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| CN201611216993.1A Pending CN108243529A (en) | 2016-12-26 | 2016-12-26 | A kind of LED dimming driving circuits |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI711338B (en) * | 2019-08-20 | 2020-11-21 | 宏碁股份有限公司 | Driving device |
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