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Three-terminal LED and drive circuit thereof

a technology of led drive circuit and three-terminal led, which is applied in the direction of electroluminescent light source, electric lighting source, and use of semiconductor lamps, etc., can solve the problems of difficult to power leds in series directly by dc, led damage, and inflexible application, and achieve high efficiency, high reliability, and small size

Active Publication Date: 2016-02-23
HANGZHOU ZHANSHUN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention allows for flexible control of a three-terminal LED, allowing it to function in different ways. The drive circuit is simple, efficient, linear, not causing EMI, and the LED is small and reliable. This means that the LED can be used in more situations and with greater precision.

Problems solved by technology

Typically, LED has two terminals of anode and cathode, as shown in FIG. 1, and is not flexible enough in application.
For example, it is difficult to power LEDs in series directly by DC source: LEDs will be damaged by over current flowing through when the applied voltage is too high; or LEDs cannot be derived normally because the current flowing through is insufficient when the applied voltage is too low.
When used in series, all LEDs cannot work properly only if one failed / open and results a lower reliability.

Method used

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  • Three-terminal LED and drive circuit thereof

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0050]the three-terminal LED: a three-terminal LED with schematic diagram showing as FIG. 3(A), and the internal circuit schematic diagram as FIG. 3(B), includes a LED string 3 formed by connecting at least one LED in series and a gate circuit, and a gate circuit 2, the first end of gate circuit 21 and the anode of LED string are connected with the anode of the three-terminal LED, the second end of gate circuit 22 and the cathode of the LED string are connected with the cathode of the three-terminal LED, the third end of the gate circuit 23 is connected with the gate of the three-terminal LED. The gate circuit showing as FIG. 13, based on N-MOSFET thus called N-type three-terminal LED, includes N-channel MOSFET Q20, diode D20 and resistor R20, the drain of N-channel MOSFET Q20 is connected with the first end of gate circuit, the source of N-channel MOSFET Q20 is connected with the second end of gate circuit, the anode of diode D20 is connected with the third end of gate circuit, the...

third embodiment

[0053]the three-terminal LED: a three-terminal LED with schematic diagram showing as FIG. 4(A), and the internal circuit schematic diagram as FIG. 4(B), includes a LED string 3 formed by connecting at least one LED in series and a gate circuit, and a gate circuit 2, the first end of gate circuit 21 and the anode of LED string are connected with the anode of the three-terminal LED, the second end of gate circuit 22 and the cathode of the LED string are connected with the cathode of the three-terminal LED, the third end of the gate circuit 23 is connected with the gate of the three-terminal LED. The gate circuit showing as FIG. 15, based on P-MOSFET thus called P-type three-terminal LED. The gate circuit includes P-channel MOSFET Q22, diode D20 and resistor R20, the source of P-channel MOSFET Q22 is connected with the first end of gate circuit, the drain of P-channel MOSFET Q22 is connected with the second end of gate circuit, the cathode of diode D20 is connected with the third end o...

fourth embodiment

[0055]the three-terminal LED: a P-type three-terminal LED has a gate circuit showing as FIG. 16, based on N-MOSFET. The gate circuit includes P-channel MOSFET Q22, diode D20 and D21, resistor R20 and zener Z20, the source of P-channel MOSFET Q22 is connected with the first end of gate circuit, the drain of P-channel MOSFET Q22 is connected with the second end of gate circuit, the cathode of diode D20 is connected with the third end of gate circuit, the anode of diode D20 is connected with the gate of P-channel MOSFET Q22, one end of resistor R20 is connected with the anode of diode D20, and the other end of resistor R20 is connected with the source of P-channel MOSFET Q22; the cathode of diode D21 is connected with the cathode of zener Z20, the anode of zener Z20 is connected with the drain of P-channel MOSFET Q22, the anode of diode D21 is connected with the gate of P-channel MOSFET Q22; the others circuit configuration and principle are same to the third.

[0056]The fifth embodiment...

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Abstract

A three-terminal LED and drive circuit thereof. The three-terminal LED (1) has an anode, a cathode and a gate. The three-terminal LED (1) includes a LED group (3) formed by connecting at least one LED in series and a gate circuit (2), the first end (21) of the gate circuit (2) and the anode of the LED group (3) are connected with the anode of the three-terminal LED (1), the second end (22) of the gate circuit (2) and the cathode of the LED group (3) are connected with the cathode of the three-terminal LED (1), the third end (23) of the gate circuit (2) is connected with the gate of the three-terminal LED (1).

Description

PRIORITY CLAIM[0001]This is a U.S. national stage of application No. PCT / CN2013 / 075792, filed on May 17, 2013. Priority is claimed on the following application: Country: CN, Application No.: 201210178950.4, Filed: Jun. 4, 2012; Country: CN, Application No.: 201210595143.2, Filed: Dec. 31, 2012, the content of which is / are incorporated here by reference.TECHNICAL FIELD[0002]The present invention relates to light emitting diode (LED) and LED drive circuit, and more particularly to a three-terminal LED and drive circuit thereof.BACKGROUND OF THE INVENTION[0003]As a new lighting source, LED has many significant advantages, such as high lighting efficiency, long life. Typically, LED has two terminals of anode and cathode, as shown in FIG. 1, and is not flexible enough in application. For example, it is difficult to power LEDs in series directly by DC source: LEDs will be damaged by over current flowing through when the applied voltage is too high; or LEDs cannot be derived normally becau...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H05B37/02H05B33/08H05B44/00
CPCH05B33/083H05B33/089H05B33/0812H05B33/0824H05B45/395H05B45/48H05B45/44Y02B20/30H05B45/54
Inventor LV, FANGLING
Owner HANGZHOU ZHANSHUN TECH