Flicker-free dimming circuit for non-point light source

Patent metadata

Field	Value
Publication number	US-9854630-B1
Application number	US-201715427274-A
Country	US
Kind code	B1
Filing date	Feb 8, 2017
Priority date	Dec 5, 2016
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A flicker-free dimming circuit for non-point light source has a TRIAC module, an input module, a conversion module and an output module. The TRIAC module adjusts the voltage phase of an external power supply for the input module to export an input voltage, and the conversion module in a boost circuit structure is provided with a conversion coil and a converter to receive and raise the voltage value of the input voltage to a voltage value of an operating voltage and then supplies the operating voltage to the output module. The output module adopts a fly-back circuit structure and induces the operating voltage to form a driving voltage in a constant value and then outputs the driving voltage to a lamp with a relatively wide light source area. In this way, the panel lamp can meet high safety standards and enhance its product adaptability and competiveness.

First claim

What is claimed is:

1. A flicker-free dimming circuit for a non-point light source, comprising an input module, a conversion module and an output module, and the input module being electrically coupled to an external power supply and provided for outputting an input voltage, and the conversion module being electrically coupled to the input module and the output module and provided for outputting an operating voltage to the output module after receiving an input current, and the output module outputting a driving voltage to drive at least one lamp with a wide light source area to operate, characterized in that the flicker-free dimming circuit for a non-point light source comprises a TRIAC module for regulating a conduction phase angle of the input voltage, and the conversion module adopts a boost circuit structure and has a conversion coil and a converter, and the conversion coil and the converter are provided for increasing a voltage value of the input voltage to a voltage value of the operating voltage, and the output module adopts a fly-back circuit structure and has a control coil module and a regulator, and the control coil module is provided for sensing the operating voltage to form the driving voltage while the regulator regulates a working period of the driving voltage to achieve a constant voltage value,
wherein the operating voltage has a voltage value of 220 volts, the converter has a sensing coil, a first core, a conversion chip, and a conversion switch, and the conversion coil is installed at a primary side of the first core, and the sensing coil is installed at a secondary side of the first core and electrically coupled to the conversion chip, and the conversion switch is electrically coupled to the conversion chip and the conversion coil, and when the conversion coil transmits the input voltage, the sensing coil forms a sensing voltage through the first core, and the sensing voltage is provided for the conversion chip for reference and then regulate a working period of the conversion switch to maintain the voltage value of the input voltage constant.

2. The flicker-free dimming circuit for a non-point light source according to claim 1 , wherein the control coil module comprises a primary side coil, a second core, a secondary side coil and a regulation coil, and the primary side coil and the regulation coil are installed at a primary side of the second core, and the secondary side coil is installed at a secondary side of the second core, and the regulator is electrically coupled to the primary side coil and the regulation coil, and the primary side coil is electrically coupled to the conversion module for receiving the operating voltage, and the secondary side coil forms the driving voltage through magnetic induction of the second core, meanwhile the regulation coil forms a regulation signal through magnetic induction of the second core, and the regulation signal is provided for the regulator to regulate a working period of the primary side coil.

3. The flicker-free dimming circuit for a non-point light source according to claim 2 , wherein the regulator has a regulation chip, a regulation switch, and a detection element, and the detection element is electrically coupled to the regulation coil and the regulation chip, and the regulation switch is electrically coupled to the regulation chip and the primary side coil, and when a regulation voltage is obtained from the operating voltage of the magnetic induction of the regulation coil, the detection element detects and forms a regulation signal and feeds back the regulation signal to the regulation chip, so that the regulation chip regulates a working period of the regulation switch to regulate a cycle time of the operating voltage received by the primary side coil, so as to achieve a constant voltage effect.

Assignees

• Unity Opto Technology Co Ltd

Inventors

• Wu Chih-Hsien
• Chuang Kai-Cheng
• Hung Cheng-Han

Classifications

• H02M1/081

  wherein the phase of the control voltage is adjustable with reference to the AC source · CPC title

• H02M3/33507 Primary

  with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence) · CPC title

• H05B45/10

  Controlling the intensity of the light · CPC title

• H02M5/257

  using semiconductor devices only · CPC title

• H02M3/33523

  with galvanic isolation between input and output of both the power stage and the feedback loop · CPC title