CN102595731B - Light-dimming LED controller and output short-circuit protection method thereof - Google Patents
Light-dimming LED controller and output short-circuit protection method thereof Download PDFInfo
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- CN102595731B CN102595731B CN201210039630.0A CN201210039630A CN102595731B CN 102595731 B CN102595731 B CN 102595731B CN 201210039630 A CN201210039630 A CN 201210039630A CN 102595731 B CN102595731 B CN 102595731B
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Abstract
The invention relates to a light-dimming LED controller, which comprises a light-dimming control circuit, wherein the output end of the light-dimming control circuit is connected with an external LED load; and the light-dimming control circuit comprises a singlechip microcomputer controller and a switch tube, wherein an I/O (Input/Output) port of the singlechip microcomputer controller is connected with a grid electrode of the switch tube, a source electrode of the switch tube is grounded, and a drain electrode of the switch tube is connected with the cathode input end of the external LED load. The light-dimming LED controller is characterized by further comprising an output short-circuit protection circuit, wherein the output short-circuit protection circuit comprises a first divider resistor and a second divider resistor, the first end of the first divider resistor is connected with the input end of a positive power supply, the second end of the first divider resistor is connected with the first end of the second divider resistor, and the second end of the second divider resistor is connected with the input end of a negative power supply; and the second end of the first divider resistor is connected with another I/O port of the singlechip microcomputer controller. Compared with the prior art, the light-dimming LED controller has the advantages of simple circuit structure and low cost.
Description
Technical field
The present invention relates to a kind of light-dimming LED controller output short-circuit protection method.
Background technology
Existing most light-dimming LED controller does not arrange output short circuit protection circuit, when controller uses, can have unsafe factor.Even if some light-dimming LED controllers are provided with output short circuit protection circuit, its circuit structure complexity, cost is higher.
Summary of the invention
First technical problem to be solved by this invention is to provide for above-mentioned prior art the light-dimming LED controller with output short circuit protection circuit that a kind of circuit structure is simple, cost is low.
Second technical problem to be solved by this invention is the output short-circuit protection method that the light-dimming LED controller with output short circuit protection circuit that a kind of circuit structure is simple, cost is low is provided for above-mentioned prior art.
The present invention solves the technical scheme that above-mentioned first technical problem adopts: this light-dimming LED controller, comprise the adjusting control circuit of output termination external LED load, this adjusting control circuit comprises singlechip controller and switching tube, wherein singlechip controller I/O I/O port is connected with the grid of described switching tube, the source ground of described switching tube, the drain electrode of described switching tube is connected with the negative input of external LED load; The electrode input end of external LED load is connected with cathode power supply input, ground connection after the power input connection electric capacity of singlechip controller, it is characterized in that: described light-dimming LED controller also comprises output short circuit protection circuit, this output short circuit protection circuit comprises the first divider resistance and the second divider resistance, wherein the first end of the first divider resistance is connected with cathode power supply input, the second end of the first divider resistance is connected with the first end of the second divider resistance, and the second end of the second divider resistance is connected with negative power supply input; The second end of the first divider resistance is connected with another I/O I/O port of described singlechip controller, and described singlechip controller is one to have the singlechip controller of comparator.
As improvement, light-dimming LED controller provided by the invention also comprises the anti-circnit NOT of input, the anti-circnit NOT of this input comprises the first diode, the second diode, wherein, the anode of the first diode is connected with cathode power supply input, the first end of the negative electrode of the first diode and described the first divider resistance; The anode of the second diode is connected with cathode power supply input, and the negative electrode of the second diode is connected with the power input of described singlechip controller after connecting voltage reduction module.
The present invention solves the technical scheme that above-mentioned two technical problems adopt: have the output short-circuit protection method of the light-dimming LED controller of said structure, it comprises the steps:
Compared with prior art, the invention has the advantages that: by two divider resistance composition output short circuit protection circuits are set, make light-dimming LED controller provided by the invention there is the problem that prevents LED load short circuits, even if LED load short circuits, also can not cause the damage of controller, and circuit structure is simple, cost is low; In addition, the anti-circnit NOT of input is set, makes light-dimming LED controller provided by the invention there is the problem of input counnter attack.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of light-dimming LED controller in the embodiment of the present invention one.
Fig. 2 is the circuit theory diagrams of light-dimming LED controller in the embodiment of the present invention two.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
Embodiment mono-:
Light-dimming LED controller shown in Figure 1, it comprises adjusting control circuit and the output short circuit protection circuit of the load of output termination external LED, wherein adjusting control circuit comprises singlechip controller N1 and switching tube Q1, singlechip controller N1 adopts the microprocessor with comparator that model is PIC12F629, after an I/O I/O port (the 5th pin GP2) resistance R 4 of singlechip controller N1, be connected with the grid of described switching tube Q1, the source ground of described switching tube Q1, the drain electrode of described switching tube Q1 is connected with the negative input of external LED load; The electrode input end of external LED load is connected with cathode power supply input; And output short circuit protection circuit comprises the first divider resistance R1 and the second divider resistance R2; Wherein, the power input of singlechip controller N1 connects the rear ground connection of capacitor C 1; The first end of the first divider resistance R1 is connected with cathode power supply input, and the second end of the first divider resistance R1 is connected with the first end of the second divider resistance R2, and the second end of the second divider resistance is connected with negative power supply input; The second end of the first divider resistance R1 is connected with another I/O I/O port (the 6th pin GP1) of described singlechip controller N1.
The output short-circuit protection method with the light-dimming LED controller of said structure, it comprises the steps:
Because under normal circumstances, when switching tube Q1 is during in closed condition, after the electrode input end short circuit of the negative input of external LED load and external LED load, can not cause the damage of light-dimming LED controller.
If switching tube Q1 is in opening, after the electrode input end short circuit of the negative input of external LED load and external LED load, the voltage of input power will decline rapidly, the dividing potential drop of first divider resistance R1 the second end also will decline rapidly, due to the existence of capacitor C 1, now singlechip controller will in running order and sustainable a period of time.After the dividing potential drop of first divider resistance R1 the second end drops to below the threshold value of comparator in singlechip controller N1, singlechip controller N1 closes switching tube Q1 at once, an and lasting longer time t, with the damage that prevents switching tube Q1 now input voltage will return to normal condition, singlechip controller also turns back to normal operating conditions, and then open switching tube Q1, said process circulates simultaneously, size in the dividing potential drop of continuation inspection first divider resistance R1 the second end and singlechip controller between the threshold value of comparator, until the electrode input end of the negative input of external LED load and external LED load disconnects.
Embodiment bis-
Different from embodiment mono-, it also comprises the anti-circnit NOT of input, and shown in Figure 2, the anti-circnit NOT of this input comprises the first diode D1, the second diode D2; The anode of the first diode D1 is connected with cathode power supply input, the first end of the negative electrode of the first diode D1 and described the first divider resistance R1; The anode of the second diode D2 is connected with cathode power supply input, and the negative electrode of the second diode D2 is connected with the power input of described singlechip controller N1 after connecting voltage reduction module.
Claims (3)
1. a light-dimming LED controller, comprise the adjusting control circuit of output termination external LED load, this adjusting control circuit comprises singlechip controller and switching tube, wherein singlechip controller I/O I/O port is connected with the grid of described switching tube, the source ground of described switching tube, the drain electrode of described switching tube is connected with the negative input of external LED load; The electrode input end of external LED load is connected with cathode power supply input, ground connection after the power input connection electric capacity of singlechip controller, it is characterized in that: described light-dimming LED controller also comprises output short circuit protection circuit, this output short circuit protection circuit comprises the first divider resistance and the second divider resistance, wherein the first end of the first divider resistance is connected with cathode power supply input, the second end of the first divider resistance is connected with the first end of the second divider resistance, and the second end of the second divider resistance is connected with negative power supply input; The second end of the first divider resistance is connected with another I/O I/O port of described singlechip controller, and described singlechip controller is one to have the singlechip controller of comparator.
2. light-dimming LED controller according to claim 1, it is characterized in that: also comprise the anti-circnit NOT of input, the anti-circnit NOT of this input comprises the first diode, the second diode, wherein, the anode of the first diode is connected with cathode power supply input, the first end of the negative electrode of the first diode and described the first divider resistance; The anode of the second diode is connected with cathode power supply input, and the negative electrode of the second diode is connected with the power input of described singlechip controller after connecting voltage reduction module.
3. an output short-circuit protection method for light-dimming LED controller as claimed in claim 1, is characterized in that: comprise the steps:
Step 1, after described light-dimming LED controller works on power, singlechip controller starts initialization and exports control signal closing switch pipe;
Step 2, then singlechip controller detects the dividing potential drop of the I/O I/O port being connected with the second end of the first divider resistance, and compare with the threshold value of single-chip microcomputer internal comparator, if the dividing potential drop of the second end of the first divider resistance is less than the threshold value of comparator, singlechip controller output control signal closing switch pipe;
Step 3, wait until after time t, output control signal is opened switching tube, and returns to step 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210039630.0A CN102595731B (en) | 2012-02-21 | 2012-02-21 | Light-dimming LED controller and output short-circuit protection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210039630.0A CN102595731B (en) | 2012-02-21 | 2012-02-21 | Light-dimming LED controller and output short-circuit protection method thereof |
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| CN102595731A CN102595731A (en) | 2012-07-18 |
| CN102595731B true CN102595731B (en) | 2014-04-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109524948A (en) * | 2018-11-21 | 2019-03-26 | 上海诚佳电子科技有限公司 | A kind of electric fireproof current-limiting type protector and its safe starting method |
| CN110212777A (en) * | 2019-06-19 | 2019-09-06 | 杰华特微电子（杭州）有限公司 | The control circuit and control method for cascading circuit of reversed excitation, cascading circuit of reversed excitation |
| CN111405705B (en) * | 2020-03-25 | 2023-06-27 | 赛尔富电子有限公司 | Dimming LED controller and output short-circuit protection method |
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| CN102123536B (en) * | 2010-01-12 | 2013-10-30 | 冠捷投资有限公司 | Light-emitting diode driving circuit |
| US8503139B2 (en) * | 2010-02-05 | 2013-08-06 | Monolithic Power Systems, Inc. | High dimming ratio control and short circuit protection for LED drive with step up converter |
| CN202014080U (en) * | 2011-02-28 | 2011-10-19 | 深圳硕日新能源科技有限公司 | Short circuit protection circuit of light-emitting diode (LED) constant current source |
| CN102291885A (en) * | 2011-06-10 | 2011-12-21 | 林万炯 | Constant-current control circuit suitable for multipath LED (Light Emitting Diode) lamps |
| CN202488823U (en) * | 2012-02-21 | 2012-10-10 | 林万炯 | Dimming LED (light-emitting diode) controller |
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Owner name: NINGBO HI. TECH. PARK SELF ELECTRONICS CO., LTD. Free format text: FORMER OWNER: LIN WANJIONG Effective date: 20140926 |
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Effective date of registration: 20140926 Address after: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Patentee after: SELF ELECTRONICS CO.,LTD. Address before: 315103 Zhejiang city of Ningbo province high tech Zone Juxian Road No. 1345 Ningbo Purcell Electronics Ltd. Patentee before: Lin Wanjiong |
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Address after: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Patentee after: SELF ELECTRONICS CO., LTD. Address before: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Patentee before: SELF ELECTRONICS CO.,LTD. |