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High-precision and high-reliability LED vehicle lamp driving circuit

A technology for LED vehicle lights and driving circuits, applied in the field of integrated circuits, can solve problems such as power supply voltage and substrate potential fluctuations, common mode noise, etc., and achieve the effects of improving protection accuracy, avoiding common mode noise interference, and improving circuit reliability.

Pending Publication Date: 2021-06-29
HUANGSHAN RUIXING AUTOMOBILE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Very severe common-mode noise due to large fluctuations in supply voltage and substrate potential

Method used

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  • High-precision and high-reliability LED vehicle lamp driving circuit
  • High-precision and high-reliability LED vehicle lamp driving circuit
  • High-precision and high-reliability LED vehicle lamp driving circuit

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Experimental program
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Embodiment Construction

[0055] The present invention will be described in further detail below in conjunction with the accompanying drawings and examples.

[0056] figure 2 It is a structural diagram of the high-precision and high-reliability LED lamp driving circuit of the present invention. The high-precision and high-reliability LED lamp driving circuit includes: a bias module, an error amplification module, a current detection compensation module, a pulse width modulation module (PWM), a PWM control module, a driver module (Driver), and an oscillator module (OSC) , High-precision and high-reliability under-voltage protection circuit (UVLO), high-precision and high-reliability over-voltage protection circuit (OVLO), high-precision and wide-voltage range over-temperature protection circuit (OTP) and power switch NMOS tube MG;

[0057] The functions realized by the above-mentioned circuit modules are as follows:

[0058] The bias module mainly provides reference voltage and bias voltage for other...

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PUM

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Abstract

The invention discloses a high-precision and high-reliability LED vehicle lamp driving circuit. The circuit comprises a bias module, an error amplification module, a current detection compensation module, a pulse width modulation module, a PWM control module, an output driving module, an oscillator module (OSC), a high-precision high-reliability undervoltage protection circuit (UVLO), a high-precision high-reliability overvoltage protection circuit (OVLO), a high-precision wide-voltage-range over-temperature protection circuit (OTP) and a power switch NMOS tube MG. According to the driving circuit provided by the invention, on one hand, the common-mode interference detection circuit is adopted in the temperature protection circuit, so that common-mode noise interference is avoided, and the protection precision is improved; and on the other hand, a power supply burr detection circuit is adopted in an overvoltage protection circuit and an undervoltage protection circuit, a reset signal is output under an abnormal condition, a protection signal is locked in advance, and the reliability of the circuit is improved. The invention can be widely applied to various high-voltage integrated circuit chips.

Description

technical field [0001] The invention relates to a high-precision and high-reliability LED car lamp drive circuit, which belongs to the technical field of integrated circuits. Background technique [0002] Modern cars need to use more and more lights. Common exterior lights include: headlights, fog lights, license plate lights, reversing lights, brake lights, turn signals, position lights, position lights, parking Lights and warning lights and daytime running lights; common interior lights include dome lights, reading lights, luggage compartment lights, door lights, step lights, instrument lights, work lights, dashboard warning lights, etc. LED car lights are directly converted from electric energy to light energy by light-emitting diodes. Compared with ordinary car bulbs, the power consumption is only equivalent to 1 / 10 of traditional lights, which can better save fuel consumption and protect car circuits from being burned out by excessive load current. Compared with tradit...

Claims

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Application Information

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IPC IPC(8): H05B45/56H05B45/50H05B45/36H05B45/325
CPCH05B45/56H05B45/50H05B45/36H05B45/325Y02B20/30
Inventor 陈珍海汪伟何千道
Owner HUANGSHAN RUIXING AUTOMOBILE ELECTRONICS
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