CN204559957U - The light modulation driver circuit of a kind of LED - Google Patents
The light modulation driver circuit of a kind of LED Download PDFInfo
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- CN204559957U CN204559957U CN201520200005.9U CN201520200005U CN204559957U CN 204559957 U CN204559957 U CN 204559957U CN 201520200005 U CN201520200005 U CN 201520200005U CN 204559957 U CN204559957 U CN 204559957U
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Abstract
The utility model discloses the light modulation driver circuit of a kind of LED, comprise signal input circuit, RCC circuit and signal output apparatus, this RCC circuit comprises a transformer, the first switching tube and second switch pipe, and by this first transformer, between the first switching tube and second switch, electricity connects formation one self-maintained circuit mutually.Its tool has the following advantages: adopt discrete electronic component to form the LED light modulation driver circuit with RCC circuit, cost comparatively drive IC is low, and can reach required performance requirement; Good dimming effect.
Description
Technical field
The utility model relates to the light modulation driver circuit of a kind of LED.
Background technology
The advantages such as LED illumination is energy-efficient with it, environment friendly and pollution-free, the life-span is long become the main product of lighting technology gradually.LED illumination System adopts interchange (AC) Switching Power Supply to provide constant current to drive usually, and therefore, LED constant current driving power circuit (being called for short LED driver circuit) arises at the historic moment.The key technical indexes weighing LED driver circuit comprises conversion efficiency, power factor (PF), EMI/EMC associated test standards and various defencive functions etc.The LED drive IC that current domestic and international market is proposed many moneys and high efficiencyly has Active PFC, defencive function is complete, constant current accuracy is high; but this type of drive IC cost is high; not there is cost advantage; secondly; the starting resistor of drive IC is higher; there is clamp voltage, easily cause LED flicker in the course of the work.
Utility model content
The utility model provides the light modulation driver circuit of a kind of LED, which overcomes the prior art drive IC cost described in background technology high, easily causes the shortcoming that LED work is glimmered.
The utility model solves the technical scheme that its technical problem adopts:
The light modulation driver circuit of a kind of LED, comprise signal input circuit, RCC circuit and signal output apparatus, this RCC circuit comprises a transformer, first switching tube and second switch pipe, the base stage of this first switching tube is connected with the collector electrode of second switch pipe, the emitter of the first switching tube is by a starting resistance ground connection, the collector electrode of this first switching tube is held with the K2 of the primary coil of transformer and is connected, the base stage of this second switch pipe is connected with the emitter of the first switching tube by the first resistance, the grounded emitter of this second switch pipe, the collector electrode of this second switch pipe to be held with the K3 of secondary coil by the second resistance and frequency modulation electric capacity successively and is connected, the collector electrode of this second switch pipe is connected with the cathode output end of signal input circuit with the 3rd resistance by this second resistance successively, the K4 of this transformer secondary coil holds ground connection, the K1 end of this transformer is connected with the cathode output end of signal input circuit, the one input end of this signal output apparatus is connected with the cathode output end of this signal input circuit, another input of this signal output apparatus is held with the K2 of this primary coil by an output diode and is connected.
Among one embodiment: be connected with one between this signal input circuit and RCC circuit for providing the freewheeling circuit maintaining electric current to LED.
Among one embodiment: this freewheeling circuit comprises the 4th resistance and the first electric capacity that are connected in series mutually.
Among one embodiment: also comprise the open loop protection circuit for carrying out open-circuit-protection to the output of signal output apparatus.
Among one embodiment: this open loop protection circuit comprises voltage-stabiliser tube, controllable silicon and diode; the backward end of this voltage-stabiliser tube is held with the K4 of secondary coil and is connected; forward end and the silicon controlled of this voltage-stabiliser tube control extremely to be connected; this silicon controlled anode is connected with the base stage of the first switching tube; silicon controlled negative electrode is connected with the forward end of diode, and the backward end of this diode is held with the K3 of secondary coil and is connected.
Among one embodiment: this silicon controlled controls to be connected with between pole and the positive pole of diode mutually and the second electric capacity connect and the 5th resistance.
Among one embodiment: this signal input circuit comprises input protection unit, the first filter unit, rectification unit and the second filter unit; the output of this input protection unit is connected with the input of the first filter unit; the output of this first filter unit is connected with the input of rectification unit, and the output of this rectification unit is connected with the input of the second filter unit.
Among one embodiment: this input protection unit comprises the fuse be serially connected on signal input circuit input and the piezo-resistance be attempted by between input two ends; this first filter unit has common mode inductance; this rectification unit is a full-wave rectification bridge, and this second filter unit is π type filter circuit.
Among one embodiment: this first switching tube is metal-oxide-semiconductor, this second switch pipe is triode, and this starting resistance comprises the thermistor with negative temperature coefficient.
The technical program is compared with background technology, and its tool has the following advantages:
1, this programme adopts each discrete electronic component to form the LED light modulation driver circuit with RCC circuit, and its cost comparatively drive IC is low, and can reach required performance requirement.
2, be connected with one between this signal input circuit and RCC circuit for providing the freewheeling circuit maintaining electric current to LED, prevent LED at the clamp voltage place of input signal because dimmer occurs to cut out or have the hiccups and cause flicker, improving dimming effect.
3, the light modulation driver circuit of this LED also comprises the open loop protection circuit for carrying out open-circuit-protection to the output of signal output apparatus; prevent when opening a way in LED two ends; transformer both end voltage constantly raises, this driver circuit is in Keep Clear-High Voltage state.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Fig. 1 depicts the circuit diagram of the light modulation driver circuit of a kind of LED described in the present embodiment.
Embodiment
Please refer to Fig. 1, the light modulation driver circuit of a kind of LED, comprise signal input circuit 10, RCC (ringing choke converter) circuit 20, freewheeling circuit 30, open loop protection circuit 40 and signal output apparatus 50.
This signal input circuit 10 comprises input protection unit 11, first filter unit 12, rectification unit 13 and the second filter unit 14; the output of this input protection unit 11 is connected with the input of the first filter unit 12; the output of this first filter unit 12 is connected with the input of rectification unit 13, and the output of this rectification unit 13 is connected with the input of the second filter unit 14.This input protection unit 11 comprise be serially connected on signal input circuit 10 input for preventing the fuse of over-current phenomenon avoidance and being attempted by the piezo-resistance for preventing overvoltage phenomenon between input two ends; This first filter unit 12 has common mode inductance, can suppress the high-frequency interferencing signal in input signal and suppress this driver circuit radiate high frequency electromagnetic interference towards periphery itself, improve the Electro Magnetic Compatibility of this circuit; This rectification unit 13 is a full-wave rectification bridge, and this second filter unit 14 is π type filter circuit, for improving the Electro Magnetic Compatibility of this driver circuit and carrying out filtering to input signal.
This RCC circuit 20 comprises the first switching tube 21, second switch pipe 22 and a transformer 23, the base stage of this first switching tube 21 is connected with the collector electrode of second switch pipe 22, the emitter of the first switching tube 21 is by starting resistance 24 ground connection, the collector electrode of this first switching tube 21 is held with the K2 of the primary coil of transformer 23 and is connected, the base stage of this second switch pipe 22 is connected with the emitter of the first switching tube 21 by the first resistance 25, the grounded emitter of this second switch pipe 22, the collector electrode of this second switch pipe 22 to be held with the K3 of secondary coil by the second resistance 26 and frequency modulation electric capacity 27 successively and is connected, the collector electrode of this second switch pipe 22 is connected with the cathode output end of signal input circuit 10 with the 3rd resistance 28 by this second resistance 26 successively, the K4 of this transformer 23 secondary coil holds ground connection, the K1 end of this transformer 23 primary coil is connected with the cathode output end of signal input circuit 10, the one input end of this signal output apparatus 50 is connected with the cathode output end of this signal input circuit 10, another input of this signal output apparatus 50 is held with the K2 of this primary coil by an output diode 29 and is connected.
AC signal has one section of region close to zero point every half period after full bridge rectifier full-wave rectification, this area of low pressure often causes the built-in On current of controllable silicon dimmer for LED switch and brightness regulation not enough, cause dimmer close or have the hiccups, thus affect the dimming behavior of LED.Therefore the present embodiment is provided with freewheeling circuit 30 between this signal input circuit and RCC circuit, for circuit provides maintenance electric current, prevents LED from glimmering in area of low pressure section, thus improves dimming effect.This freewheeling circuit 30 comprises the 4th resistance 31 and the first electric capacity 32 be connected in series mutually.
The output of signal output apparatus 50 connects LED; when opening a way in LED two ends; transformer 23 primary coil both end voltage constantly raises; this driver circuit is in Keep Clear-High Voltage state, therefore the present embodiment have also been devised one for carrying out the open loop protection circuit 40 of open-circuit-protection to the output of signal output apparatus 50.This open loop protection circuit 40 comprises voltage-stabiliser tube 41, controllable silicon 42 and diode 43; the backward end of this voltage-stabiliser tube 41 is held with the K4 of secondary coil and is connected; the forward end of this voltage-stabiliser tube 41 is extremely connected with the control of controllable silicon 42; the anode of this controllable silicon 42 is connected with the base stage of the first switching tube 21; the negative electrode of controllable silicon 42 is connected with the forward end of diode 43, and the backward end of this diode 43 is held with the K3 of secondary coil and is connected.Phase is connected with and the second electric capacity connect and the 5th resistance between the control pole of this controllable silicon 42 and the positive pole of diode 43.
This RCC circuit specific works process comprises the following steps, and when (1) starts, electric current provides bias voltage to impel the first switching tube 21 conducting to the first switching tube 21 through the output port outflow of signal input circuit 10 through the 3rd resistance 28 and the second resistance 26; After (2) first switching tube 21 conductings, current circuit is: electric current → primary coil → the first switching tube 21 → starting resistance 24 → ground of the output port of signal input circuit 10, now the K1 end of transformer 23 primary coil is just, output diode 29 is reverse, primary coil energy storage; (3) starting resistance forms a forward bias voltage between the base stage and emitter of second switch pipe 22, impels second switch pipe 22 conducting; (4) after second switch pipe 22 conducting, current circuit is: output port electric current → the 3rd resistance 28 → frequency modulation electric capacity 27 → secondary coil → ground of signal input circuit 10, output port electric current → the 3rd resistance 28 → the second resistance 26 → second switch pipe 22 → ground of signal input circuit 10; (5) bias voltage impelling the first switching tube 21 after second switch pipe 22 conducting is negative value, causes the first switching tube 21 to be closed, and now the K2 end of primary coil is that just output diode 29 conducting, powers to LED; (6) because of the K2 of transformer rectify to, therefore the Same Name of Ends K4 of its secondary coil is just, provides a reverse bias voltage to second switch pipe, impels second switch pipe 22 to close; (7) after second switch pipe 22 is closed, circuit completes one-period, and circuit repeats the operation of step (1)-(6) afterwards.
The course of work of this open loop protection circuit 40 is; when opening a way in LED two ends; the voltage at transformer two ends constantly raises; the K2 end of primary coil is just; K1 end is negative; now the K4 end of secondary coil is just; K3 end is negative; until voltage-stabiliser tube 41 reverse-conducting, provide forward voltage to the gate pole of controllable silicon 42, controllable silicon 42 conducting; reverse bias voltage is provided to the first switching tube 21 and second switch pipe 22; cause the first switching tube 21 and second switch pipe 22 to be in closed condition, impel circuit to quit work, make this circuit be in guard mode.
In the present embodiment, this first switching tube 21 is metal-oxide-semiconductor, and this second switch pipe 22 is triode.This starting resistance 24 comprises the thermistor NTC with negative temperature coefficient, triode belongs to positive temperature coefficient element, when temperature raises, whole lamp power can decline, NTC belongs to negative temperature coefficient, when temperature raises, whole lamp power can rise, therefore, by this negative tempperature coefficient thermistor and this triode and complementation, can ensure that whole lamp is unlikely to excessive at the difference power of cold and hot.Also make this driver circuit have the function realizing output current and adjust with temperature simultaneously; when whole lamp uses in the case of a high temperature; output current can raise along with temperature and reduce gradually; can protect components and parts and output loading well, electric current is excessive and cause the problem of light decay in the case of a high temperature particularly can to avoid LED lamp bead.
Wherein, the selection of the Rds of metal-oxide-semiconductor and the Rbe of triode directly affects drive efficiency and power output, and the switch of metal-oxide-semiconductor and triode directly affects the operating frequency of driving memory time.Frequency modulation electric capacity can affect the switching time of triode, thus the operating frequency that impact drives.
The above, be only the utility model preferred embodiment, therefore the scope that the utility model implements can not be limited according to this, the equivalence namely done according to the utility model the scope of the claims and description change with modify, all should still belong in scope that the utility model contains.
Claims (9)
1. the light modulation driver circuit of a LED, comprise signal input circuit, RCC circuit and signal output apparatus, it is characterized in that: this RCC circuit comprises a transformer, first switching tube and second switch pipe, the base stage of this first switching tube is connected with the collector electrode of second switch pipe, the emitter of the first switching tube is by a starting resistance ground connection, the collector electrode of this first switching tube is held with the K2 of the primary coil of transformer and is connected, the base stage of this second switch pipe is connected with the emitter of the first switching tube by the first resistance, the grounded emitter of this second switch pipe, the collector electrode of this second switch pipe to be held with the K3 of secondary coil by the second resistance and frequency modulation electric capacity successively and is connected, the collector electrode of this second switch pipe is connected with the cathode output end of signal input circuit with the 3rd resistance by this second resistance successively, the K4 of this transformer secondary coil holds ground connection, the K1 end of this transformer is connected with the cathode output end of signal input circuit, the one input end of this signal output apparatus is connected with the cathode output end of this signal input circuit, another input of this signal output apparatus is held with the K2 of this primary coil by an output diode and is connected.
2. the light modulation driver circuit of a kind of LED according to claim 1, is characterized in that: be connected with one between this signal input circuit and RCC circuit for providing the freewheeling circuit maintaining electric current to LED.
3. the light modulation driver circuit of a kind of LED according to claim 2, is characterized in that: this freewheeling circuit comprises the 4th resistance and the first electric capacity that are connected in series mutually.
4. the light modulation driver circuit of a kind of LED according to claim 1 or 2 or 3, is characterized in that: also comprise the open loop protection circuit for carrying out open-circuit-protection to the output of signal output apparatus.
5. the light modulation driver circuit of a kind of LED according to claim 4; it is characterized in that: this open loop protection circuit comprises voltage-stabiliser tube, controllable silicon and diode; the backward end of this voltage-stabiliser tube is held with the K4 of secondary coil and is connected; forward end and the silicon controlled of this voltage-stabiliser tube control extremely to be connected; this silicon controlled anode is connected with the base stage of the first switching tube; silicon controlled negative electrode is connected with the forward end of diode, and the backward end of this diode is held with the K3 of secondary coil and is connected.
6. the light modulation driver circuit of a kind of LED according to claim 5, is characterized in that: this silicon controlled controls to be connected with between pole and the positive pole of diode mutually and the second electric capacity connect and the 5th resistance.
7. the light modulation driver circuit of a kind of LED according to claim 1 and 2; it is characterized in that: this signal input circuit comprises input protection unit, the first filter unit, rectification unit and the second filter unit; the output of this input protection unit is connected with the input of the first filter unit; the output of this first filter unit is connected with the input of rectification unit, and the output of this rectification unit is connected with the input of the second filter unit.
8. the light modulation driver circuit of a kind of LED according to claim 7; it is characterized in that: this input protection unit comprises the fuse be serially connected on signal input circuit input and the piezo-resistance be attempted by between input two ends; this first filter unit has common mode inductance; this rectification unit is a full-wave rectification bridge, and this second filter unit is π type filter circuit.
9. the light modulation driver circuit of a kind of LED according to claim 1, is characterized in that: this first switching tube is metal-oxide-semiconductor, and this second switch pipe is triode, and this starting resistance comprises the thermistor with negative temperature coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520200005.9U CN204559957U (en) | 2015-04-03 | 2015-04-03 | The light modulation driver circuit of a kind of LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520200005.9U CN204559957U (en) | 2015-04-03 | 2015-04-03 | The light modulation driver circuit of a kind of LED |
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| Publication Number | Publication Date |
|---|---|
| CN204559957U true CN204559957U (en) | 2015-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520200005.9U Expired - Fee Related CN204559957U (en) | 2015-04-03 | 2015-04-03 | The light modulation driver circuit of a kind of LED |
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| Country | Link |
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| CN (1) | CN204559957U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104797044A (en) * | 2015-04-03 | 2015-07-22 | 厦门佰明光电有限公司 | LED dimming driving circuit and LED dimming driving method |
| CN105101556A (en) * | 2015-08-21 | 2015-11-25 | 京东方光科技有限公司 | LED dimming driving circuit |
-
2015
- 2015-04-03 CN CN201520200005.9U patent/CN204559957U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104797044A (en) * | 2015-04-03 | 2015-07-22 | 厦门佰明光电有限公司 | LED dimming driving circuit and LED dimming driving method |
| CN105101556A (en) * | 2015-08-21 | 2015-11-25 | 京东方光科技有限公司 | LED dimming driving circuit |
| CN105101556B (en) * | 2015-08-21 | 2017-12-12 | 京东方光科技有限公司 | LED dimming driving circuits |
| US9877366B2 (en) | 2015-08-21 | 2018-01-23 | Boe Technology Group Co., Ltd. | Light-emitting diode dimming driver circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: XIAMEN BYMEA LIGHTING CO., LTD. Free format text: FORMER NAME: XIAMEN BYMEA LIGHTING LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Xiamen Gaoqi Industrial Park Road North Lake District of Xiamen City, Fujian province 361000 No. 195 building two floor E Patentee after: Xiamen Baiming Optoelectronic Co.,Ltd. Address before: Xiamen Gaoqi Industrial Park Road North Lake District of Xiamen City, Fujian province 361000 No. 195 building two floor E Patentee before: XIAMEN BYMEA LIGHTING Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150812 Termination date: 20210403 |
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| CF01 | Termination of patent right due to non-payment of annual fee |