CN102595731A - 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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- CN102595731A CN102595731A CN2012100396300A CN201210039630A CN102595731A CN 102595731 A CN102595731 A CN 102595731A CN 2012100396300 A CN2012100396300 A CN 2012100396300A CN 201210039630 A CN201210039630 A CN 201210039630A CN 102595731 A CN102595731 A CN 102595731A
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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 dimming LED (Light Emitting Diode) controller output short circuit protection method.
Background technology
Existing most dimming LED (Light Emitting Diode) controller is not provided with output short circuit protection circuit, when controller uses, can have unsafe factor.Even the dimming LED (Light Emitting Diode) controller that has is provided with output short circuit protection circuit, its circuit structure is complicated, and cost is higher.
Summary of the invention
First technical problem to be solved by this invention is to above-mentioned prior art the dimming LED (Light Emitting Diode) controller with output short circuit protection circuit that a kind of circuit structure is simple, cost is low to be provided.
Second technical problem to be solved by this invention is the output short circuit protection method that the dimming LED (Light Emitting Diode) controller with output short circuit protection circuit that a kind of circuit structure is simple, cost is low is provided to above-mentioned prior art.
The present invention solves the technical scheme that above-mentioned first technical problem adopts: this dimming LED (Light Emitting Diode) controller; The adjusting control circuit that comprises the load of output termination external LED; This adjusting control circuit comprises singlechip controller and switching tube; Wherein singlechip controller I/O I/O port links to each other with the grid of said switching tube, the source ground of said switching tube, and the drain electrode of said switching tube links to each other with the negative input of external LED load; The electrode input end of external LED load links to each other with the cathode power supply input; Ground connection behind the power input connection electric capacity of singlechip controller; It is characterized in that: said dimming LED (Light Emitting Diode) controller also comprises output short circuit protection circuit; This output short circuit protection circuit comprises first divider resistance and second divider resistance; Wherein first end of first divider resistance links to each other with the cathode power supply input, and second end of first divider resistance links to each other with first end of second divider resistance, and second end of second divider resistance links to each other with the negative power supply input; Second end of first divider resistance links to each other with another I/O I/O port of said singlechip controller, and said singlechip controller is one to have the singlechip controller of comparator.
As improvement; Dimming LED (Light Emitting Diode) controller provided by the invention also comprises the anti-circnit NOT of input; The anti-circnit NOT of this input comprises first diode, second diode; Wherein, the anode of first diode links to each other with the cathode power supply input, first end of the negative electrode of first diode and said first divider resistance; The anode of second diode links to each other with the cathode power supply input, and the negative electrode of first diode links to each other with the power input of said singlechip controller after connecting the step-down module.
The present invention solves above-mentioned two technical schemes that technical problem adopted: have the output short circuit protection method of the dimming LED (Light Emitting Diode) controller of said structure, it comprises the steps:
Step 1, after said dimming LED (Light Emitting Diode) controller works on power, singlechip controller begins initialization and exports control signal off switch pipe;
Step 2, singlechip controller detects the dividing potential drop of the I/O I/O port link to each other with second end of first divider resistance then; And compare with the threshold value of single-chip microcomputer internal comparator; If the dividing potential drop of second end of first divider resistance is less than the threshold value of comparator, then singlechip controller is exported control signal off switch pipe;
Step 3, wait until time t after, the output control signal is opened switching tube, and returns step 2.
Compared with prior art; The invention has the advantages that: form output short circuit protection circuit through two divider resistances are set; The LED load short circuits make dimming LED (Light Emitting Diode) controller provided by the invention have the problem that prevents the LED load short circuits, even if also can not cause the damage of controller; And circuit structure is simple, and cost is low; In addition, the anti-circnit NOT of input is set, makes dimming LED (Light Emitting Diode) controller provided by the invention have the problem of input counnter attack.
Description of drawings
Fig. 1 is the circuit theory diagrams of dimming LED (Light Emitting Diode) controller in the embodiment of the invention one.
Fig. 2 is the circuit theory diagrams of dimming LED (Light Emitting Diode) controller in the embodiment of the invention two.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one:
Referring to dimming LED (Light Emitting Diode) controller shown in Figure 1; It comprises the 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; It is the microprocessor with comparator of PIC12F629 that singlechip controller N1 adopts model; The I/O I/O port of singlechip controller N1 (the 5th pin GP2) resistance R 4 backs link to each other with the grid of said switching tube Q1, the source ground of said switching tube Q1, and the drain electrode of said switching tube Q1 links to each other with the negative input of external LED load; The electrode input end of external LED load links to each other with the 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 capacitor C 1 back ground connection; First end of the first divider resistance R1 links to each other with the cathode power supply input, and second end of the first divider resistance R1 links to each other with first end of the second divider resistance R2, and second end of second divider resistance links to each other with the negative power supply input; Second end of the first divider resistance R1 links to each other with another I/O I/O port (the 6th pin GP1) of said singlechip controller N1.
Have the output short circuit protection method of the dimming LED (Light Emitting Diode) controller of said structure, it comprises the steps:
Step 1, after said dimming LED (Light Emitting Diode) controller works on power, singlechip controller begins initialization and exports control signal off switch pipe;
Step 2, singlechip controller detects the dividing potential drop of the I/O I/O port link to each other with second end of first divider resistance then; And compare with the threshold value of single-chip microcomputer internal comparator; If the dividing potential drop of second end of first divider resistance is less than the threshold value of comparator, then singlechip controller is exported control signal off switch pipe;
Step 3, wait until time t after, the output control signal is opened switching tube, and returns step 2.
Because under the normal condition, when switching tube Q1 is 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 dimming LED (Light Emitting Diode) controller.
If switching tube Q1 is in opening; The input power source voltage will descend rapidly after the electrode input end short circuit of the negative input of external LED load and external LED load; The dividing potential drop of the first divider resistance R1, second end also will descend rapidly; Because the existence of capacitor C 1, this moment, singlechip controller will in running order and sustainable a period of time.After the dividing potential drop of the first divider resistance R1, second end drops to below the threshold value of comparator in the singlechip controller N1; Singlechip controller N1 closes switching tube Q1 at once; And continue long time t, and will return to normal condition with damage input voltage this moment that prevents switching tube Q1, singlechip controller also turns back to normal operating conditions; And then open switching tube Q1; Size in the said process that circulates simultaneously, the dividing potential drop that continues the inspection first divider resistance R1 second end and singlechip controller between the threshold value of comparator is till the electrode input end disconnection of the negative input of external LED load and external LED load.
Embodiment two
Different with embodiment one is, it also comprises the anti-circnit NOT of input, and referring to shown in Figure 2, this input prevents that circnit NOT comprises the first diode D1, the second diode D2; The anode of the first diode D1 links to each other with the cathode power supply input, first end of the negative electrode of the first diode D1 and the said first divider resistance R1; The anode of the second diode D2 links to each other with the cathode power supply input, and the negative electrode of the second diode D2 links to each other with the power input of said singlechip controller N1 after connecting the step-down module.
Claims (3)
1. dimming LED (Light Emitting Diode) controller; The adjusting control circuit that comprises the load of output termination external LED; This adjusting control circuit comprises singlechip controller and switching tube; Wherein singlechip controller I/O I/O port links to each other with the grid of said switching tube, the source ground of said switching tube, and the drain electrode of said switching tube links to each other with the negative input of external LED load; The electrode input end of external LED load links to each other with the cathode power supply input; Ground connection behind the power input connection electric capacity of singlechip controller; It is characterized in that: said dimming LED (Light Emitting Diode) controller also comprises output short circuit protection circuit; This output short circuit protection circuit comprises first divider resistance and second divider resistance; Wherein first end of first divider resistance links to each other with the cathode power supply input, and second end of first divider resistance links to each other with first end of second divider resistance, and second end of second divider resistance links to each other with the negative power supply input; Second end of first divider resistance links to each other with another I/O I/O port of said singlechip controller, and said singlechip controller is one to have the singlechip controller of comparator.
2. dimming LED (Light Emitting Diode) 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 first diode, second diode; Wherein, the anode of first diode links to each other with the cathode power supply input, first end of the negative electrode of first diode and said first divider resistance; The anode of second diode links to each other with the cathode power supply input, and the negative electrode of second diode links to each other with the power input of said singlechip controller after connecting the step-down module.
3. the output short circuit protection method of dimming LED (Light Emitting Diode) controller according to claim 1 is characterized in that: comprise the steps:
Step 1, after said dimming LED (Light Emitting Diode) controller works on power, singlechip controller begins initialization and exports control signal off switch pipe;
Step 2, singlechip controller detects the dividing potential drop of the I/O I/O port link to each other with second end of first divider resistance then; And compare with the threshold value of single-chip microcomputer internal comparator; If the dividing potential drop of second end of first divider resistance is less than the threshold value of comparator, then singlechip controller is exported control signal off switch pipe;
Step 3, wait until time t after, the output control signal is opened switching tube, and returns step 2.
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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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| 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 true CN102595731A (en) | 2012-07-18 |
| CN102595731B CN102595731B (en) | 2014-04-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111405705A (en) * | 2020-03-25 | 2020-07-10 | 赛尔富电子有限公司 | Dimming L ED controller and output short-circuit protection method |
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| CN102123536A (en) * | 2010-01-12 | 2011-07-13 | 冠捷投资有限公司 | Light-emitting diode driving circuit |
| US20110194214A1 (en) * | 2010-02-05 | 2011-08-11 | Kaiwei Yao | 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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2012
- 2012-02-21 CN CN201210039630.0A patent/CN102595731B/en active Active
Patent Citations (5)
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| CN102123536A (en) * | 2010-01-12 | 2011-07-13 | 冠捷投资有限公司 | Light-emitting diode driving circuit |
| US20110194214A1 (en) * | 2010-02-05 | 2011-08-11 | Kaiwei Yao | 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 |
Cited By (3)
| 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 |
| CN111405705A (en) * | 2020-03-25 | 2020-07-10 | 赛尔富电子有限公司 | Dimming L ED controller and output short-circuit protection method |
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| CN102595731B (en) | 2014-04-16 |
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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. |