CN201957310U - High-accuracy light emitting diode (LED) constant-current driver - Google Patents
High-accuracy light emitting diode (LED) constant-current driver Download PDFInfo
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- CN201957310U CN201957310U CN2011200490233U CN201120049023U CN201957310U CN 201957310 U CN201957310 U CN 201957310U CN 2011200490233 U CN2011200490233 U CN 2011200490233U CN 201120049023 U CN201120049023 U CN 201120049023U CN 201957310 U CN201957310 U CN 201957310U
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Abstract
The utility model relates to a light emitting diode (LED) constant-current driver, which comprises a shock-resistant circuit, a rectifier filter circuit, a high-frequency and high-voltage switching circuit, a high-frequency filter circuit, a pulse drive circuit, a constant-current control circuit and an LED open-circuit protection circuit. The LED constant-current driver is characterized in that the output signals of the shock-resistant circuit are input to the high-frequency filter circuit, the output signals of the high-frequency filter circuit are respectively input to the high-frequency and high-voltage switching circuit and the pulse drive circuit, the output signals of the pulse drive circuit are input to the high-frequency and high-voltage switching circuit, the output signals of the high-frequency and high-voltage switching circuit are input to an LED through the high-frequency filter circuit, the LED open-circuit protection circuit is parallel-connected with the LED, one end of the LED is connected with the sampling end of the constant-current control circuit, the output signals of the constant-current control circuit are input to the pulse drive circuit, the grid of a power switching tube in the high-frequency and high-voltage switching circuit is connected with the output end of the pulse drive circuit, the drain of the power switching tube is connected with the high-frequency filter circuit, and the source of the power switching tube is grounded through a current-limiting resistor. The LED constant-current driver has the advantages of high constant current accuracy, small impacts caused by power supply voltage and temperature change, reliable LED short-circuit and open-circuit protection function, low loss and the like.
Description
Technical field
The utility model relates to a kind of LED constant-flow driver, is applicable to the illumination control of LED tunnel, colliery lamp, LED street lamp and Tunnel Lamp and other LED.
Background technology
In the market the LED constant-flow driver of high voltage supply basically as shown in Figure 1, though simply there is following deficiency in this circuit: (1) constant current accuracy is poor, and the operating current of LED changes with grid voltage change; (2) when short circuit appears in certain LED, if the number of LED series connection more after a little while, constant current value changes greatly; (3) when a certain open circuit of the LED of series connection, all LED of other LED will extinguish; (4) circuit is strict to the inductance value of energy storage filter inductance, is not suitable for producing in enormous quantities.
Summary of the invention
Technical problem to be solved in the utility model provides the LED constant-flow driver of a kind of high accuracy, reliable operation, to improve serviceability and the application prospect of LED.
The technical solution of the utility model is: a kind of LED constant-flow driver; comprise the shock resistance circuit; current rectifying and wave filtering circuit; the high-frequency and high-voltage switching circuit; high-frequency filter circuit; pulse driving circuit; it is characterized in that: also comprise constant-current control circuit and LED open loop protection circuit; the output signal of described shock resistance circuit inputs to high-frequency filter circuit; the output signal of high-frequency filter circuit inputs to high-frequency and high-voltage switching circuit and pulse driving circuit respectively; the pulse driving circuit output signal inputs to the high-frequency and high-voltage switching circuit; the output signal of high-frequency and high-voltage switching circuit inputs to LED through high-frequency filter circuit; the LED open loop protection circuit is in parallel with LED; LED one end connects constant-current control circuit sampling end; the output signal of constant-current control circuit inputs to pulse driving circuit; the grid of power switch pipe is connected with the output of pulse driving circuit in the high-frequency and high-voltage switching circuit; drain electrode connects high-frequency filter circuit, and source electrode is connected with the ground end through current-limiting resistance.
The beneficial effects of the utility model: compare with existing constant-flow driver; has the constant current accuracy height; be subjected to supply voltage; influence of temperature change is little; and working as certain LED short circuit or opening a way to keep constant current value constant; LED short circuit and open circuit protecting function are reliable, loss is little, are applicable to LED coal mine roadway lamp, LED street lamp, Tunnel Lamp and other LED illumination control.
The utility model is described in further detail below in conjunction with the drawings and the specific embodiments.
Description of drawings
Fig. 1 is the electrical schematic diagram of existing a kind of LED constant-flow driver;
Fig. 1 is a kind of embodiment circuit block diagram of the utility model LED constant-flow driver;
Fig. 2 is a kind of embodiment electrical schematic diagram of the utility model LED constant-flow driver.
Embodiment
As Fig. 1; shown in Figure 2; present embodiment LED constant-flow driver; comprise the shock resistance circuit; current rectifying and wave filtering circuit; the high-frequency and high-voltage switching circuit; high-frequency filter circuit; pulse driving circuit; it is characterized in that: also comprise constant-current control circuit and LED open loop protection circuit; the output signal of described shock resistance circuit inputs to high-frequency filter circuit; the output signal of high-frequency filter circuit inputs to high-frequency and high-voltage switching circuit and pulse driving circuit respectively; the pulse driving circuit output signal inputs to the high-frequency and high-voltage switching circuit; the output signal of high-frequency and high-voltage switching circuit inputs to LED through high-frequency filter circuit; the LED open loop protection circuit is in parallel with LED; LED one end connects constant-current control circuit sampling end; the output signal of constant-current control circuit inputs to pulse driving circuit; the grid G of power switch pipe V1 is connected with the output (special-purpose integration module IC1 the 4th pin) of pulse driving circuit in the high-frequency and high-voltage switching circuit; drain D connects high-frequency filter circuit, and source S is connected with the ground end through current-limiting resistance R4.
Pulse driving circuit comprises special-purpose integration module IC1, the buffer circuit that the linearity light adjusting end of special-purpose integration module IC1 in the pulse driving circuit (the 7th pin of special-purpose integration module IC 1) connecting resistance R1, capacitor C 4 are formed, utilize the time-lag action of resistance R 1, capacitor C 4 to make power tube V1 output pulse widen impulse current in the time of reducing to start shooting gradually.
Constant-current control circuit is made up of current sampling resistor R17, integrated comparator IC2A, photoelectrical coupler IC3 and peripheral resistance capacitance, its input connects the sample resistance R17 that connects with LED, and output connects the linearity light adjusting end (the 7th pin of special-purpose integration module IC1) of special-purpose integration module IC1 through photoelectrical coupler IC3.The working current value of LED, the reference voltage decision by the voltage on the current sampling R17 and peripheral resistance R 12, R15, R16 dividing potential drop is not subjected to the input supply voltage variable effect, even the size of inductance value is changing the precision that does not also influence constant current among a small circle.Because the constant-current control circuit dc power supply is made up of R11, VD7, C8, C9, its voltage stabilizing didoe VD7 is in parallel with the LED load through resistance R 11, VD7 is the voltage stabilizing didoe of zero warm coefficient, temperature influence is very little, and sample resistance R17 is a precision resistance in addition, and influence of temperature change is also very little, therefore in the total head scope, under the variable condition, actual measurement LED constant current value changes still less than 1%, near perfect condition temperature significantly.
The LED open loop protection circuit is by unidirectional little triggering thyristor V2, V3, and sample resistance R5, R6, R7, R8 and anti-interference capacitor C10, C12 form, and unidirectional little triggering thyristor and sample resistance are attempted by the two ends of 1 or many LED respectively.When vibration, rosin joint or LED self open circuit appearred in pcb board, the voltage that is added in little triggering thyristor V2 or V3 two ends triggered through resistance much larger than rated operational voltage, thyristor conducting and self-locking, and it is luminous to guarantee that 50%LED continues.Thyristor G, K extremely go up electric capacity C10, C12 effect and prevent the thyristor false triggering, mislead; no this defencive function in the ifs circuit when a LED open circuit, is not only all LED and is extinguished; also can cause the overvoltage of filter capacitor C2, C5, even the electric capacity explosion hazard can occur.Certainly every LED two ends and on 5 above series diodes, equally also have open circuit protecting function, but number of diodes is too big, welded and installed inconvenience, the big and loss that can produce the forward lightly conducting in normal operating conditions of when action protection loss.
The high-frequency and high-voltage switching circuit comprises switching tube V1 and current-limiting resistance R4, voltage on the injectron V1 current-limiting resistance R4 is the current detecting end (special-purpose integration module the 2nd pin) that meets special-purpose integration module IC1 in the pulse driving circuit after resistance R 9, capacitor C 7 filtering, its effect is a filtering high frequency burr, makes constant current control more accurate.
High-frequency filter circuit comprises filter inductance L1, and filter inductance L1 adopts the very little magnetic jar coiling of leakage field.Select the purpose of magnetic jar magnetic screen to have two, the one, reduce influencing each other of inner and outer magnetic field, make circuit working more reliable, the 2nd, wiring board is contained in the aluminum hull, can reduce the influence of metal shell to inductance value greatly.
In sum, present embodiment LED constant-flow driver has the following advantages: (1) constant current accuracy height, be subjected to supply voltage, and influence of temperature change is little; (2) LED short circuit and open circuit protecting function are reliable, loss is little; (3) produce debugging easily, be convenient to produce in enormous quantities.
Claims (9)
1. LED constant-flow driver; comprise the shock resistance circuit; current rectifying and wave filtering circuit; the high-frequency and high-voltage switching circuit; high-frequency filter circuit; pulse driving circuit; it is characterized in that: also comprise constant-current control circuit and LED open loop protection circuit; the output signal of described shock resistance circuit inputs to high-frequency filter circuit; the output signal of high-frequency filter circuit inputs to high-frequency and high-voltage switching circuit and pulse driving circuit respectively; the pulse driving circuit output signal inputs to the high-frequency and high-voltage switching circuit; the output signal of high-frequency and high-voltage switching circuit inputs to LED through high-frequency filter circuit; the LED open loop protection circuit is in parallel with LED; LED one end connects constant-current control circuit sampling end; the output signal of constant-current control circuit inputs to pulse driving circuit; the grid of power switch pipe is connected with the output of pulse driving circuit in the high-frequency and high-voltage switching circuit; drain electrode connects high-frequency filter circuit, and source electrode is connected with the ground end through current-limiting resistance.
2. LED constant-flow driver according to claim 1, it is characterized in that: described pulse driving circuit comprises special-purpose integration module, described constant-current control circuit is made up of current sampling resistor, integrated comparator, photoelectrical coupler and peripheral resistance capacitance, its input connects the sample resistance of connecting with LED, and output connects the linearity light adjusting end of special-purpose integration module through photoelectrical coupler.
3. LED constant-flow driver according to claim 1 and 2; it is characterized in that: described LED open loop protection circuit is made up of unidirectional little triggering thyristor, sample resistance and anti-interference capacitor, and unidirectional little triggering thyristor and sample resistance are attempted by the two ends of 1 or many LED respectively.
4. LED constant-flow driver according to claim 1 and 2 is characterized in that: the buffer circuit that the linearity light adjusting terminating resistor of the special-purpose integration module in the described pulse driving circuit, electric capacity are formed.
5. LED constant-flow driver according to claim 3 is characterized in that: the buffer circuit that the linearity light adjusting terminating resistor of the special-purpose integration module in the described pulse driving circuit, electric capacity are formed.
6. LED constant-flow driver according to claim 1 and 2, it is characterized in that: described high-frequency and high-voltage switching circuit comprises injectron and current-limiting resistance, and the voltage on the injectron current-limiting resistance connects the current detecting end of special-purpose integration module in the pulse driving circuit behind resistance, capacitor filtering.
7. LED constant-flow driver according to claim 3, it is characterized in that: described high-frequency and high-voltage switching circuit comprises injectron and current-limiting resistance, and the voltage on the injectron current-limiting resistance connects the current detecting end of special-purpose integration module in the pulse driving circuit behind resistance, capacitor filtering.
8. LED constant-flow driver according to claim 4, it is characterized in that: described high-frequency and high-voltage switching circuit comprises injectron and current-limiting resistance, and the voltage on the injectron current-limiting resistance connects the current detecting end of special-purpose integration module in the pulse driving circuit behind resistance, capacitor filtering.
9. LED constant-flow driver according to claim 5, it is characterized in that: described high-frequency and high-voltage switching circuit comprises injectron and current-limiting resistance, and the voltage on the injectron current-limiting resistance connects the current detecting end of special-purpose integration module in the pulse driving circuit behind resistance, capacitor filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200490233U CN201957310U (en) | 2011-02-22 | 2011-02-22 | High-accuracy light emitting diode (LED) constant-current driver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200490233U CN201957310U (en) | 2011-02-22 | 2011-02-22 | High-accuracy light emitting diode (LED) constant-current driver |
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| CN201957310U true CN201957310U (en) | 2011-08-31 |
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| CN2011200490233U Expired - Fee Related CN201957310U (en) | 2011-02-22 | 2011-02-22 | High-accuracy light emitting diode (LED) constant-current driver |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510605A (en) * | 2011-10-17 | 2012-06-20 | 潘永雄 | Novel LED (light emitting diode) driving circuit |
| CN102982770A (en) * | 2012-11-23 | 2013-03-20 | 四川长虹欣锐科技有限公司 | Flat panel light emitting diode (LED) backlight drive output short circuit protective circuit |
| CN103002627A (en) * | 2011-09-15 | 2013-03-27 | 海洋王照明科技股份有限公司 | LED drive circuit with function of time delay and LED lamp |
| CN103024978A (en) * | 2011-09-22 | 2013-04-03 | 雅达电子国际有限公司 | Led driver circuits |
-
2011
- 2011-02-22 CN CN2011200490233U patent/CN201957310U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103002627A (en) * | 2011-09-15 | 2013-03-27 | 海洋王照明科技股份有限公司 | LED drive circuit with function of time delay and LED lamp |
| CN103002627B (en) * | 2011-09-15 | 2015-04-01 | 海洋王照明科技股份有限公司 | LED drive circuit with function of time delay and LED lamp |
| CN103024978A (en) * | 2011-09-22 | 2013-04-03 | 雅达电子国际有限公司 | Led driver circuits |
| CN102510605A (en) * | 2011-10-17 | 2012-06-20 | 潘永雄 | Novel LED (light emitting diode) driving circuit |
| CN102510605B (en) * | 2011-10-17 | 2014-03-26 | 潘永雄 | Novel LED (light emitting diode) driving circuit and drive method |
| CN102982770A (en) * | 2012-11-23 | 2013-03-20 | 四川长虹欣锐科技有限公司 | Flat panel light emitting diode (LED) backlight drive output short circuit protective circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110831 Termination date: 20130222 |