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PWM dimming control type TLCC drive circuit

A dimming control and drive circuit technology, applied in the field of drive circuits, PWM dimming control type TLCC drive circuits, can solve problems such as flicker, achieve outstanding performance, alleviate the problem of lack of chips, and achieve the effect of over-temperature automatic protection

Pending Publication Date: 2021-08-27
杭州火石照明有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unlike traditional incandescent lamps, LED lamps are not purely resistive loads. If they are directly equipped with dimmers for dimming, they will cause serious problems such as flickering, which need to be solved urgently

Method used

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  • PWM dimming control type TLCC drive circuit
  • PWM dimming control type TLCC drive circuit
  • PWM dimming control type TLCC drive circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] refer to figure 1 , a PWM dimming control type TLCC drive circuit of the present invention, comprising a power supply, a dimming module, an over-temperature protection module and an LED load, the dimming module is arranged between the power supply and the over-temperature protection module, the dimming The optical module includes a triode Q3, a current limiting resistor R3, a grounding resistor R4 and a pulse width modulator PWM, the base of the triode Q3 is connected to the communication interface of the pulse width modulator PWM through the current limiting resistor R3 The resistor R4 is connected to the cathode loop end of the power supply, and the emitter of the triode Q3 is connected to the cathode loop end of the power supply;

[0028] The pulse width modulator PWM switches the PWM signal to a floating or low-level state, and uses the transistor Q3 to turn on the over-temperature protection module, so that the LED load and the power supply are conducted;

[0029]...

Embodiment 2

[0049] refer to figure 2 , a shunt resistor is connected between the collector of the triode Q2 and the emitter of the triode Q2.

[0050] Others are the same as embodiment one.

[0051] The shunt resistor RA added in parallel between the collector of the transistor Q2 and the emitter of the transistor Q2 in the TLCC drive circuit has a unique function of shunting and dividing power consumption, which can make the positive terminal of the LED load flow into the negative terminal of the LED load. The circuit is divided into two paths. One of the two currents directly flows through the collector of the transistor Q2 to the emitter of the transistor Q2 , while the other current flows through the shunt resistor RA and then flows to the emitter of the transistor Q2 . The two currents are finally brought together at the emitter of the transistor Q2, and then connected to the base of the transistor Q1 to form a loop to the ground through the constant current resistor Rs.

[0052]...

Embodiment 3

[0054] refer to image 3 , a PWM dimming control type TLCC drive circuit of the present invention, comprising a power supply, a dimming module, an over-temperature protection module and an LED load, the dimming module is arranged between the power supply and the over-temperature protection module, the dimming The optical module includes a triode Q3, a current limiting resistor R3, a grounding resistor R4 and a pulse width modulator PWM, the base of the triode Q3 is connected to the communication interface of the pulse width modulator PWM through the current limiting resistor R3 The resistor R4 is connected to the cathode loop end of the power supply, and the emitter of the triode Q3 is connected to the cathode loop end of the power supply;

[0055] The pulse width modulator PWM switches the PWM signal to a floating or low-level state, and uses the transistor Q3 to turn on the over-temperature protection module, so that the LED load and the power supply are conducted;

[0056]...

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Abstract

A PWM dimming control type TLCC drive circuit disclosed by the present invention comprises a power supply, a dimming module, an over-temperature protection module and an LED load, the dimming module is arranged between the power supply and the over-temperature protection module, and the dimming module comprises a triode Q3, a current-limiting resistor R3, a ground resistor R4 and a pulse width modulator PWM. A base electrode of the triode Q3 is connected with a communication interface of the pulse width modulator PWM through a current-limiting resistor R3 and is connected with a cathode loop end of the power supply through a ground resistor R4, an emitting electrode of the triode Q3 is connected with the cathode loop end of the power supply, current can be output constantly, and the over-temperature automatic protection characteristic is achieved; and dimming can be carried out according to needs.

Description

【Technical field】 [0001] The present invention relates to the technical field of driving circuits, in particular to the technical field of a PWM dimming control type TLCC (Triolinear constant current) driving circuit. 【Background technique】 [0002] LED lights are recognized as the fourth-generation green light source, with many advantages such as high efficiency, long life, safety and environmental protection, small size, high reliability, and fast response speed. The technology is mature and widely used in various fields. Since the LED is a constant current load, it must be driven by a constant current to ensure that it always maintains a safe and stable working condition. Existing LED lamp drive circuits usually rely on dedicated constant current drive chips for constant current drive. Therefore, the production capacity of the product is greatly affected by the market supply of the chip, and the price of the product is likely to change with the price increase of the chip....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/10H05B45/325H05B45/345H05B45/56H05B45/50
CPCH05B45/10H05B45/325H05B45/345H05B45/56H05B45/50Y02B20/30
Inventor 刘磊
Owner 杭州火石照明有限公司
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