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PWM dimming circuit

A dimming circuit and voltage technology, which is applied to light sources, electric light sources, electrical components, etc., can solve problems such as poor smoothness of regulation, poor user experience of products, and incompatibility with the user's human eye observation comfort, so as to achieve smooth regulation and user Experience the best effect

Active Publication Date: 2018-02-06
NINGBO SDIAPER OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing PWM dimming circuits generally perform dimming through different input voltages. The greater the input voltage, the stronger the luminous intensity of the power supply, and there is often a linear relationship between the input voltage and the output current that controls the luminous intensity. Such output characteristics It often does not meet the user's human eye observation comfort, and the control smoothness is poor, resulting in poor user experience of the product

Method used

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Such as figure 1 As shown, in a preferred embodiment, a PWM dimming circuit is proposed, which is applied to LED (light-emitting diode, referred to as LED) light-emitting modules, which may include:

[0031] The step-down module 10 includes a voltage input port IN1 and a voltage output port OUT1;

[0032] The voltage input port IN1 is used to receive the dimming voltage input from the outside;

[0033] The step-down module 10 steps down the dimming voltage to a control voltage, and outputs the control voltage from the voltage output port OUT1;

[0034] The control module 20 includes an input pin GP4 and an output pin GP2;

[0035] The input pin GP4 of the control module 20 is connected to the voltage output port OUT1 of the step-down module 10 for receiving the control voltage;

[0036] The control module 20 presets a processing model, and th...

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Abstract

The invention relates to the field of automatic control, and particularly relates to a PWM dimming circuit. The PWM dimming circuit is applied to an LED light-emitting module. The PWM dimming circuitcomprises a voltage reduction module, a control module and an MOS tube. The voltage reduction module comprises a voltage input port and a voltage output port. The voltage reduction module is used forreducing a dimming voltage into a control voltage. The control module is pre-provided with a processing model. The control module obtains a pulse control signal corresponding to a duty cycle accordingto the control voltage through the processing model. The pulse control signal is outputted by the control module through an output pin. The grid electrode of the MOS tube is connected with the outputpin. In this way, the MOS tube is conducted under the control of the pulse control signal. The drain electrode of the MOS tube is connected with the LED light-emitting module so as to control the LEDlight-emitting module to emit light. The processing model has an input and output characteristic rule of an exponential curve, so that the corresponding relation between the pulse control signal andthe control voltage is in an exponential curve characteristic. The output characteristic conforms to the human eye observation comfort degree of a user, so that the regulation and control process is smooth. The user experience of a product is good.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a PWM dimming circuit. Background technique [0002] PWM (Pulse Width Modulation pulse width modulation, referred to as PWM) control technology is a very effective technology that uses the digital output of the microprocessor to control the analog circuit. It is widely used in many fields from measurement, communication to power control and conversion. in the field. [0003] Existing PWM dimming circuits generally perform dimming through different input voltages. The greater the input voltage, the stronger the luminous intensity of the power supply, and there is often a linear relationship between the input voltage and the output current that controls the luminous intensity. Such output characteristics It often does not meet the user's human eye observation comfort, and the control smoothness is poor, resulting in poor user experience of the product. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10Y02B20/30
Inventor 张莉曲志华
Owner NINGBO SDIAPER OPTOELECTRONICS