CN203104914U - Improved LED (Lighting-Emitting Diode) driving circuit - Google Patents
Improved LED (Lighting-Emitting Diode) driving circuit Download PDFInfo
- Publication number
- CN203104914U CN203104914U CN 201320109276 CN201320109276U CN203104914U CN 203104914 U CN203104914 U CN 203104914U CN 201320109276 CN201320109276 CN 201320109276 CN 201320109276 U CN201320109276 U CN 201320109276U CN 203104914 U CN203104914 U CN 203104914U
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- circuit
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- led element
- led
- drive circuit
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Abstract
The utility model discloses an improved LED (Lighting-Emitting Diode) driving circuit which structurally comprises an anti-surge rectification-filtering element, an open circuit protecting circuit and a constant-current circuit capable of adjusting the size of current. According to the improved LED driving circuit, the security of the LED driving circuit can be improved, the defects that all serially connected LED elements can not be used if one is damaged can be overcome, and the practicability is strong.
Description
Technical field
The utility model relates to a kind of drive circuit of element, especially a kind of improved led drive circuit.
Background technology
Along with sustained economic growth, demand for energy is increasing, and in energy today day by day in short supply, fully energy savings has very significant meaning.LED is because of it has low-power consumption, the life-span is long, volume is little and characteristics such as environmental protection, comprise show and the more and more wide field of illumination in be applied.
In the prior art, the drive circuit functionality of LED is single, can't satisfy the demand of consumer to the LED product.
The utility model content
The technical problems to be solved in the utility model provides a kind of improved led drive circuit; can solve the deficiencies in the prior art; by anti-surge rectifying and wave-filtering element, breaking protection circuit and constant-current circuit are set; improved the fail safe of led drive circuit, the LED element of having avoided series connection to use damages the shortcoming that causes all LED elements to use owing to one.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
A kind of improved led drive circuit, ac input end are in series with fuse resistance F1, are parallel with piezo-resistance R1 simultaneously, insert rectification circuit D1 then, and then insert polar protective circuit D2; Series connection inserts several LED elements after polar protective circuit D2, and each LED element is parallel with a breaking protection circuit P1; The output of the LED element of series connection is connected with power switch pipe Q1, the drive circuit of power switch pipe Q1 is made up of resistance R 2, controller IC 1 and resistance R 3, the constant current control of entire circuit is undertaken by resistance R 3, when the electric current in the LED element reached certain value, the voltage on the resistance R 3 will trigger controller IC 1 switch-off power switching tube Q1 to reach the constant of electric current in the series LED element.
As preferably; described breaking protection circuit comprises a decision circuitry and a bypass resistance; decision circuitry is an operational amplifier; bypass resistance is a metal-oxide-semiconductor field effect transistor; metal-oxide-semiconductor field effect transistor and LED element are connected in parallel; the input in the same way of operational amplifier is connected with a constant reference voltage, and its reverse input end is connected with the negative pole of LED element, and its output is connected with the grid of metal-oxide-semiconductor field effect transistor.
As preferably, described controller IC 1 is the PWM control integrated circuit.
As preferably, described rectification circuit is in series with inductance, is parallel with electric capacity simultaneously.
The beneficial effect that adopts technique scheme to bring is: the fuse resistance in the utility model plays the effect of overcurrent protection.Piezo-resistance absorbs the surge voltage of ac input end.Inductance of connecting in the rectification circuit and electric capacity in parallel have played the effect of filtering.Breaking protection circuit can be judged whether normally of the LED element in parallel with it, if find to disconnect, breaking protection circuit can guarantee the normal use of other LED element automatically with the short circuit of LED element.Adopt the PWM control integrated circuit to regulate the current constant of LED element, save cost.
Description of drawings
Fig. 1 is the circuit diagram of an embodiment of the utility model.
Fig. 2 is the circuit diagram of breaking protection circuit in embodiment of the utility model.
Embodiment
With reference to Fig. 1-2, ac input end of the present utility model is in series with fuse resistance F1, is parallel with piezo-resistance R1 simultaneously, inserts rectification circuit D1 then, and then inserts polar protective circuit D2; Series connection inserts several LED elements after polar protective circuit D2, and each LED element is parallel with a breaking protection circuit P1; The output of the LED element of series connection is connected with power switch pipe Q1, the drive circuit of power switch pipe Q1 is made up of resistance R 2, controller IC 1 and resistance R 3, the constant current control of entire circuit is undertaken by resistance R 3, when the electric current in the LED element reached certain value, the voltage on the resistance R 3 will trigger controller IC 1 switch-off power switching tube Q1 to reach the constant of electric current in the series LED element.
It should be noted that; described breaking protection circuit P1 comprises a decision circuitry and a bypass resistance; decision circuitry is an operational amplifier OP-AMP; bypass resistance is a metal-oxide-semiconductor field effect transistor FET; metal-oxide-semiconductor field effect transistor FET and LED element are connected in parallel; the input in the same way of operational amplifier OP-AMP is connected with a constant reference voltage, and its reverse input end is connected with the negative pole of LED element, and its output is connected with the grid of metal-oxide-semiconductor field effect transistor FET.
It should be noted that described controller IC 1 is the PWM control integrated circuit.
In addition, described rectification circuit is in series with inductance L 1, is parallel with capacitor C 1 simultaneously.
Operation principle of the present utility model is: the alternating current of ac input end becomes direct current through rectification circuit D1, and the filter circuit of forming by inductance L 1 and capacitor C 1 filters out Harmonic Interference.Fuse resistance F1 plays the effect of overcurrent protection to entire circuit.
In breaking protection circuit P1, if LED element operate as normal, the voltage of LED element positive pole will equal the operating voltage of this LED element.The reverse input end of operational amplifier OP-AMP is connected with a constant reference voltage Verf2, and this constant reference voltage Verf2 is arranged to bigger than the voltage of the positive pole of LED element, but littler than the input voltage V+ of power supply circuits.Because the voltage of the reverse input end of operational amplifier OP-AMP is bigger than the voltage of input in the same way.Therefore the output at operational amplifier OP-AMP will produce low-voltage, makes metal-oxide-semiconductor field effect transistor FET be in cut-off state.Not conducting of whole breaking protection circuit P1, promptly electric current only flows through from the LED element.When the LED element opens circuit because of fortuitous event, the voltage of the input in the same way of operational amplifier 171 rises to V+, at this moment, the voltage V+ of the input in the same way of operational amplifier OP-AMP wants the voltage Verf2 of ratio inverse input to want big, therefore the output at operational amplifier OP-AMP will produce high voltage, makes metal-oxide-semiconductor field effect transistor FET conducting.Electric current will flow through from metal-oxide-semiconductor field effect transistor FET, with the short circuit of LED element, makes the LED element operate as normal of other serial connection.
When the electric current in the LED element surpassed the constant current of setting, the PWM control integrated circuit was closed power switch pipe Q1, and the LED element utilizes the afterflow work of inductance L 1.When electric current during progressively less than the constant current set, the PWM control integrated circuit is opened power switch pipe Q1 again, enters next regulating cycle.
More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. improved led drive circuit, it is characterized in that: ac input end is in series with fuse resistance (F1), is parallel with piezo-resistance (R1) simultaneously, inserts rectification circuit (D1) then, and then inserts polar protective circuit (D2); Connect afterwards at polar protective circuit (D2) and to insert several LED elements, each LED element is parallel with a breaking protection circuit (P1); The output of the LED element of series connection is connected with power switch pipe (Q1), the drive circuit of power switch pipe (Q1) is made up of resistance (R2), controller (IC1) and resistance (R3), the constant current control of entire circuit is undertaken by resistance (R3), when the electric current in the LED element reached certain value, the voltage on the resistance (R3) will trigger controller (IC1) switch-off power switching tube (Q1) to reach the constant of electric current in the series LED element.
2. improved led drive circuit according to claim 1; it is characterized in that: described breaking protection circuit (P1) comprises a decision circuitry and a bypass resistance; decision circuitry is an operational amplifier (OP-AMP); bypass resistance is a metal-oxide-semiconductor field effect transistor (FET); metal-oxide-semiconductor field effect transistor (FET) is connected in parallel with the LED element; the input in the same way of operational amplifier (OP-AMP) is connected with a constant reference voltage; its reverse input end is connected with the negative pole of LED element, and its output is connected with the grid of metal-oxide-semiconductor field effect transistor (FET).
3. improved led drive circuit according to claim 1 is characterized in that: described controller (IC1) is the PWM control integrated circuit.
4. improved led drive circuit according to claim 1 is characterized in that: described rectification circuit is in series with inductance (L1), is parallel with electric capacity (C1) simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320109276 CN203104914U (en) | 2013-03-08 | 2013-03-08 | Improved LED (Lighting-Emitting Diode) driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320109276 CN203104914U (en) | 2013-03-08 | 2013-03-08 | Improved LED (Lighting-Emitting Diode) driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203104914U true CN203104914U (en) | 2013-07-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320109276 Expired - Fee Related CN203104914U (en) | 2013-03-08 | 2013-03-08 | Improved LED (Lighting-Emitting Diode) driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203104914U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109868578A (en) * | 2019-03-26 | 2019-06-11 | 上海鲍麦克斯电子科技有限公司 | A kind of light eye control system |
| TWI665936B (en) * | 2017-07-18 | 2019-07-11 | 大陸商全億大科技（佛山）有限公司 | Dimming control circuit |
-
2013
- 2013-03-08 CN CN 201320109276 patent/CN203104914U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI665936B (en) * | 2017-07-18 | 2019-07-11 | 大陸商全億大科技（佛山）有限公司 | Dimming control circuit |
| CN109868578A (en) * | 2019-03-26 | 2019-06-11 | 上海鲍麦克斯电子科技有限公司 | A kind of light eye control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20140308 |