CN102625531A - Control circuit of waterproof LED (Light Emitting Diode) flashlight - Google Patents
Control circuit of waterproof LED (Light Emitting Diode) flashlight Download PDFInfo
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- CN102625531A CN102625531A CN2012100690281A CN201210069028A CN102625531A CN 102625531 A CN102625531 A CN 102625531A CN 2012100690281 A CN2012100690281 A CN 2012100690281A CN 201210069028 A CN201210069028 A CN 201210069028A CN 102625531 A CN102625531 A CN 102625531A
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Abstract
The invention discloses an illumination control circuit of a novel LED (Light Emitting Diode) flashlight. The circuit is composed of a DC (Direct Current) charging constant-current circuit, batteries, a PWM (Pulse Width Modulation) circuit, a singlechip microcomputer circuit, an auxiliary circuit and an LED lamp. The entire circuit is powered by adopting six 1.2V nickel-metal hydride batteries, has the capacity of 700mAh and is divided into five gears in total, and two touch keys are adopted to increase or reduce the brightness of the lamp. The work current is 700mA when the maximal gear is supported, the work current at the minimal gear corresponds to the longest discharge time, and the brightness can be selected as required. After the control circuit is started, the work current of the lamp is set to be the middle gear, the current is 350mA, and the brightness is about 50%. When the voltage of the batteries is reduced to 6V, the power supply is cut off, the quiescent current of the circuit is smaller than 50 mu A, a switch is used for tuning on and turning off the lamp by adopting a magnetic element (a magnetic reed pipe), and thus, the LED flashlight is prolonged in service life.
Description
Technical field:
The present invention relates to the LED flashlight, particularly a kind of New LED flashlight lighting control circuit.
Background technology:
At present, common LED flashlight standby power consumption amount is big, and the light modulation gear is few, and switch is a mechanical type, loose contact and damage easily, the design in order to overcome these deficiencies of this circuit.
Summary of the invention:
In view of above-mentioned technical problem, the invention provides a kind of New LED flashlight lighting control circuit.This control circuit is regulated the LED lamp through being provided with from the light modulation gear of 70mA～700mA.And adopt magnetic reed switch to reduce to 6V at cell voltage, and the circuit quiescent current is less than 50uA, situation under the opening and shutting off of control lamp, prolong LED flashlight useful life with this.
Concrete technical scheme of the present invention is following:
The Waterproof LED flashlight control circuit is made up of DC charging constant-current circuit, battery, PWN circuit, single chip circuit, auxiliary circuit and LED lamp.Particular circuit configurations is following:
This circuit is provided with power supply B1, the resistance R 5 that is connected with power supply B1 and R6, isolated gate FET Q1, triode Q2, resistance R 3 and R4, electric capacity EC1 and step-down constant-current source U3; Said triode Q2 also is connected with capacitor C 1, resistance R 7 and R8; Said step-down constant-current source U3 also connects resistance R 1 and R2, capacitor C 8, diode D1, inductance L 1 and LED lamp;
Said circuit also is provided with single-chip microcomputer U1, and its PIN1 pin connects capacitor C 2, resistance R 11 and R12, magnetic reed switch K1; Its PIN4 pin connects resistance R 13 and power supply VCC; Capacitor C 9 is connected between PIN4 pin and the PIN5 pin; Resistance R 9 and capacitor C 3 are connected between PIN5 pin and the PIN6 pin; Resistance R 10 and capacitor C 5 are connected between PIN5 pin and the PIN7 pin; The PIN1 pin connects light contact dimmer switch K2, K3; PIN4, PIN5, PIN6 and PIN7 pin together are connected ground connection GND; The PIN9 pin connects step-down constant-current source U3; The PIN10 pin connects power supply VCC; Crystal oscillator is connected between PIN11 pin and the PIN12 pin; The PIN13 pin connects capacitor C 4, resistance R 3 and R4, ground connection GND; The PIN14 pin connects resistance R 7 and R8;
Said circuit also is provided with voltage stabilizing chip U2, is connected with electric capacity EC3, capacitor C 7, power supply VCC between its PIN1 pin and the PIN2 pin; Be connected with electric capacity EC2, capacitor C 6, ground connection GND between PIN1 pin and the PIN3 pin;
Said circuit also is provided with socket DC1, and the two ends of this socket connect charging indicator light LED1, resistance R 16 side by side, triode Q3, resistance R 18, resistance R 17, isolated gate FET Q4; Said isolated gate FET Q4 connects diode D2, also connects the PIN3 pin of voltage stabilizing chip U2.
As preferred version, it is the single-chip microcomputer of EM78P259 that said single-chip microcomputer U1 adopts model.
As preferred version, it is the chip of MD7350 that said voltage stabilizing chip U2 adopts model.
As preferred version, it is the isolated gate FET of AOD407 that said isolated gate FET Q1 adopts model.
As preferred version, said triode Q2 employing model is 3904 triode.
Control circuit advantage of the present invention is: entire circuit adopts the Ni-MH battery power supply of 6 joint 1.2V, and capacity is 700mAH, is divided into 5 gears altogether, adopts two and touches the brightness that button increases or reduce lamp.Operating current is 700mA when supporting maximum, the long discharge time of operating current during deep low gear (70mA) correspondence, can select brightness as required.The operating current that starts back light is located at middle bay, and electric current is 350mA, and brightness is about 50%.When cell voltage reduces to 6V, cut off power supply, this circuit quiescent current is less than 50uA, and switch adopts opening and shutting off of magnetic element (magnetic red pipe) control lamp, prolongs LED flashlight useful life.
Description of drawings:
Further specify the present invention below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the block diagram of control circuit according to the invention.
Fig. 2 is the circuit structure diagram of control circuit according to the invention.
Embodiment:
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.
As shown in Figure 1, Waterproof LED flashlight control circuit of the present invention is made up of DC charging constant-current circuit 11, battery 12, PWN circuit 13, single chip circuit 16, auxiliary circuit 15 and LED lamp 14.
As shown in Figure 2, this circuit is provided with power supply B1, the resistance R 5 that is connected with power supply B1 and R6, isolated gate FET Q1, triode Q2, resistance R 3 and R4, electric capacity EC1 and step-down constant-current source U3; Said triode Q2 also is connected with capacitor C 1, resistance R 7 and R8; Step-down constant-current source U3 also connects resistance R 1 and R2, capacitor C 8, diode D1, inductance L 1 and LED lamp.
Circuit also is provided with single-chip microcomputer U1, and its PIN1 pin connects capacitor C 2, resistance R 11 and R12, magnetic reed switch K1; Its PIN4 pin connects resistance R 13 and power supply VCC; Capacitor C 9 is connected between PIN4 pin and the PIN5 pin; Resistance R 9 and capacitor C 3 are connected between PIN5 pin and the PIN6 pin; Resistance R 10 and capacitor C 5 are connected between PIN5 pin and the PIN7 pin; The PIN1 pin connects light contact dimmer switch K2, K3; PIN4, PIN5, PIN6 and PIN7 pin together are connected ground connection GND; The PIN9 pin connects step-down constant-current source U3; The PIN10 pin connects power supply VCC; Crystal oscillator is connected between PIN11 pin and the PIN12 pin; The PIN13 pin connects capacitor C 4, resistance R 3 and R4, ground connection GND; The PIN14 pin connects resistance R 7 and R8;
Circuit also is provided with voltage stabilizing chip U2, is connected with electric capacity EC3, capacitor C 7, power supply VCC between its PIN1 pin and the PIN2 pin; Be connected with electric capacity EC2, capacitor C 6, ground connection GND between PIN1 pin and the PIN3 pin;
Circuit also is provided with socket DC1, and the two ends of this socket connect charging indicator light LED1, resistance R 16 side by side, triode Q3, resistance R 18, resistance R 17, isolated gate FET Q4; Said isolated gate FET Q4 connects diode D2, also connects the PIN3 pin of voltage stabilizing chip U2.
Circuit according to the invention also possesses following characteristics:
(1) single chip circuit U1 (EM78P259) is a product operation control centre;
(2) U2 (MD7350) voltage stabilizing chip is that circuit provides 5V voltage-stabilizing power supply;
(3) U3 (PT4115) is the step-down constant-current source of a continuous electric inducing current conduction mode, is used to drive a LED lamp.And can accept the PWM light modulation of wide range through the PIN3 pin.
(4) Q3 and Q4 have formed a constant-current source circuit, and to battery (B1) constant-current constant-voltage charging, continuous current is 120mA.
The principle of this circuit is following:
Entire circuit is through the external DC of DC1 socket (direct current) 12V, and charging indicator light LED1 is bright, through after Q3 and the Q4 constant current battery B1 being charged.When magnetic reed switch (K1) triggers; The VCC voltage (5V) that U2 (MD7350) produce to produce has been added to the PIN1 of single-chip microcomputer U1 (EM78P259) through magnetic reed switch (K1) moment; When PIN1 detects high level; The PIN14 pin is also exported high level and is made Q2 (3904) conducting, thereby the G pole tension of Q1 (AOD407) MOS is dragged down, and also makes the Q1MOS conducting.The voltage of battery (B1) flows to U3 (PT4115) constant-flow driver through Q1, thereby the LED lamp is lighted.If click magnetic reed switch (K1) once more when triggering, also just turn-off LED and go out.
In addition, have the brightness that 5 gears are regulated the LED lamp, brightness is about centre 50% after the LED lamp is lighted, and clicks light contact-making switch (K2) brightness and is increased to about 75%, clicks brightness again and just is maximum 100%.Just turn down by light contact-making switch (K3),, drop to brightness about 10% at last for minimum successively from 100%-75%-50%-30%-10%.Because the PIN6 of single-chip microcomputer U1 (EM78P259) and PIN7 detect high level one time, the PIN3 pulsewidth of U3 (PT4115) is just adjusted in PIN9 output, thereby reaches the purpose of regulating brightness.When the PIN13 of single-chip microcomputer U1 (EM78P259) detected voltage and is 6V, PIN14 turn-offed with regard to output low level Q2 and Q1, under-voltage protection at this moment, and the LED lamp goes out, and at this moment needs just reusing after the battery charge.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the specification just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection range to be defined by appending claims and equivalent thereof.
Claims (5)
1. the Waterproof LED flashlight control circuit is characterized in that, said circuit is provided with power supply B1, the resistance R 5 that is connected with power supply B1 and R6, isolated gate FET Q1, triode Q2, resistance R 3 and R4, electric capacity EC1 and step-down constant-current source U3; Said triode Q2 also is connected with capacitor C 1, resistance R 7 and R8; Said step-down constant-current source U3 also connects resistance R 1 and R2, capacitor C 8, diode D1, inductance L 1 and LED lamp;
Said circuit also is provided with single-chip microcomputer U1, and its PIN1 pin connects capacitor C 2, resistance R 11 and R12, magnetic reed switch K1; Its PIN4 pin connects resistance R 13 and power supply VCC; Capacitor C 9 is connected between PIN4 pin and the PIN5 pin; Resistance R 9 and capacitor C 3 are connected between PIN5 pin and the PIN6 pin; Resistance R 10 and capacitor C 5 are connected between PIN5 pin and the PIN7 pin; The PIN1 pin connects light contact dimmer switch K2, K3; PIN4, PIN5, PIN6 and PIN7 pin together are connected ground connection GND; The PIN9 pin connects step-down constant-current source U3; The PIN10 pin connects power supply VCC; Crystal oscillator is connected between PIN11 pin and the PIN12 pin; The PIN13 pin connects capacitor C 4, resistance R 3 and R4, ground connection GND; The PIN14 pin connects resistance R 7 and R8;
Said circuit also is provided with voltage stabilizing chip U2, is connected with electric capacity EC3, capacitor C 7, power supply VCC between its PIN1 pin and the PIN2 pin; Be connected with electric capacity EC2, capacitor C 6, ground connection GND between PIN1 pin and the PIN3 pin;
Said circuit also is provided with socket DC1, and the two ends of this socket connect charging indicator light LED1, resistance R 16 side by side, triode Q3, resistance R 18, resistance R 17, isolated gate FET Q4; Said isolated gate FET Q4 connects diode D2, also connects the PIN3 pin of voltage stabilizing chip U2.
2. according to the Waterproof LED flashlight control circuit of claim 1, it is characterized in that it is the single-chip microcomputer of EM78P259 that said single-chip microcomputer U1 adopts model.
3. according to the Waterproof LED flashlight control circuit of claim 1, it is characterized in that it is the chip of MD7350 that said voltage stabilizing chip U2 adopts model.
4. according to the Waterproof LED flashlight control circuit of claim 1, it is characterized in that it is the isolated gate FET of AOD407 that said isolated gate FET Q1 adopts model.
5. according to the Waterproof LED flashlight control circuit of claim 1, it is characterized in that said triode Q2 employing model is 3904 triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100690281A CN102625531A (en) | 2012-03-15 | 2012-03-15 | Control circuit of waterproof LED (Light Emitting Diode) flashlight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100690281A CN102625531A (en) | 2012-03-15 | 2012-03-15 | Control circuit of waterproof LED (Light Emitting Diode) flashlight |
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| CN102625531A true CN102625531A (en) | 2012-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012100690281A Pending CN102625531A (en) | 2012-03-15 | 2012-03-15 | Control circuit of waterproof LED (Light Emitting Diode) flashlight |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702480A (en) * | 2013-12-16 | 2014-04-02 | 生迪光电科技股份有限公司 | LED (Light-Emitting Diode) driving circuit and emitted light color changing method through LED driving circuit in combination with power switch |
| CN108966464A (en) * | 2018-08-15 | 2018-12-07 | 青岛亿联客信息技术有限公司 | Method, gear adjusting method and the device, system of light modulation gear are set |
| CN111366872A (en) * | 2020-05-13 | 2020-07-03 | 佛山职业技术学院 | Flashlight discharge time testing arrangement and control circuit |
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| US20090295305A1 (en) * | 2008-06-02 | 2009-12-03 | Advanced Analog Technology, Inc. | Led driver circuit |
| CN101715263A (en) * | 2009-10-20 | 2010-05-26 | 海洋王照明科技股份有限公司 | LED drive control method and system, and portable LED light-emitting device |
| CN101827480A (en) * | 2010-04-30 | 2010-09-08 | 海洋王照明科技股份有限公司 | LED drive control circuit |
| CN202587485U (en) * | 2012-03-15 | 2012-12-05 | 无锡市威德盛电子有限公司 | Control circuit of waterproof LED electric torch |
-
2012
- 2012-03-15 CN CN2012100690281A patent/CN102625531A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090295305A1 (en) * | 2008-06-02 | 2009-12-03 | Advanced Analog Technology, Inc. | Led driver circuit |
| CN101715263A (en) * | 2009-10-20 | 2010-05-26 | 海洋王照明科技股份有限公司 | LED drive control method and system, and portable LED light-emitting device |
| CN101827480A (en) * | 2010-04-30 | 2010-09-08 | 海洋王照明科技股份有限公司 | LED drive control circuit |
| CN202587485U (en) * | 2012-03-15 | 2012-12-05 | 无锡市威德盛电子有限公司 | Control circuit of waterproof LED electric torch |
Non-Patent Citations (1)
| Title |
|---|
| 陈雷: "基于PT4115的大功率LED恒流驱动的设计", 《灯与照明》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702480A (en) * | 2013-12-16 | 2014-04-02 | 生迪光电科技股份有限公司 | LED (Light-Emitting Diode) driving circuit and emitted light color changing method through LED driving circuit in combination with power switch |
| CN103702480B (en) * | 2013-12-16 | 2016-04-20 | 生迪光电科技股份有限公司 | LED drive circuit and the method in conjunction with mains switch change glow color thereof |
| CN108966464A (en) * | 2018-08-15 | 2018-12-07 | 青岛亿联客信息技术有限公司 | Method, gear adjusting method and the device, system of light modulation gear are set |
| CN108966464B (en) * | 2018-08-15 | 2020-07-21 | 青岛亿联客信息技术有限公司 | Method for setting dimming gear, gear adjusting method, gear adjusting device and gear adjusting system |
| CN111366872A (en) * | 2020-05-13 | 2020-07-03 | 佛山职业技术学院 | Flashlight discharge time testing arrangement and control circuit |
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Effective date of abandoning: 20170301 |