LED drive circuit
A LED drive and circuit technology, applied in circuit layout, lamp circuit layout, electric light source, etc., can solve the problems of LED not lighting, high product defect rate, and difficult to distinguish anode pins and cathode pins, etc., to reduce defects rate effect
Inactive Publication Date: 2010-11-03
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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- Description
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- Application Information
AI Technical Summary
Problems solved by technology
If the positive and negative pins are wrongly connected, the LED will not light up
However, it is not easy to distinguish the anode pin and the cathode pin only by looking at the appearance of the LED. In this case, when producing electronic equipment with LEDs, assemblers are likely to reverse the LED pins, resulting in a high defect rate of products.
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[0012] The present invention will be further described below in conjunction with specific embodiments with reference to the accompanying drawings.
[0013] Please refer to figure 1 A preferred embodiment of the LED driving circuit of the present invention includes a timer E1, a first transistor Q1, a second transistor Q2, a third transistor Q3 and an LED L1.
[0014] The timer E1 includes a ground terminal P1, a trigger terminal P2, an output terminal P3, a reset terminal P4, a control terminal P5, a threshold terminal P6, a discharge terminal P7 and a power supply terminal P8, the timer The power supply terminal P8 of E1 is connected with a +5V power supply, the ground terminal P1 is grounded, the discharge terminal P7 is connected with the +5V power supply through a resistor R4, the reset terminal P4 is connected with the power supply terminal P8, and the control terminal P5 is connected through a The capacitor C1 is grounded, the trigger terminal P2 is connected to the thr...
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The invention discloses an LED drive circuit comprising a timer, a first triode, a second triode, a third triode and an LED. The base electrodes of the first triode and the second triode are connected with the output end of the timer, the emitting electrodes of the first triode and the second triode are grounded, and the collector electrode of the first triode and the second triode are connected with a power supply through a pull-up resistor; the base electrode of the third triode is connected with the collector electrode of the second triode, the emitting electrode of the third triode is grounded, and the collector of the third triode is connected with the power supply through a pull-up resistor; and the LED is electrically connected between the collector electrode of the first triode and the collector electrode of the third triode. By regulating the output frequency of the timer, the LED drive circuit ensures that the voltages of the collector electrodes of the first triode and the third triode change constantly so as to cause the LED to be constantly turned on and turned off, therefore, assembling workers do not need to distinguish an anode pin and a cathode pin when installing the pins of the LED, the problem of false connection of LED pins by the assembling workers is solved, and the reject ratio of the product is reduced.
Description
technical field [0001] The invention relates to an LED driving circuit. Background technique [0002] LEDs are often used as indicator lights to indicate the working status of electronic equipment. The LED has an anode pin and a cathode pin. Only when the anode pin of the LED is connected to a high level and the cathode pin is connected to a low level, the LED can work normally. If the positive and negative pins are connected incorrectly, the LED will not light up. However, it is not easy to distinguish the anode pin and the cathode pin only by looking at the appearance of the LED. In this case, when producing electronic equipment with LEDs, assemblers are likely to reverse the LED pins, resulting in a high defect rate of products. Contents of the invention [0003] In view of the above, it is necessary to provide an LED drive circuit that prevents the LED from being unable to display due to wrong connections between the anode pin and the cathode pin of the LED. [0004...
Claims
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IPC IPC(8): H05B37/00H05B37/02F21V23/00F21Y101/02
CPCH05B33/0818Y02B20/346H05B45/3725Y02B20/30
Inventor 陈晓竹吴弘毅刘磊
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD