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Steady current drive

A drive device and current stabilization technology, applied in lighting devices, output power conversion devices, lamp circuit layout, etc., can solve problems such as poor power supply stability, increased power supply costs, and reduced market competitiveness

Active Publication Date: 2018-03-02
CHINA RESOURCES MICROELECTRONICS (CHONGQING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There will be common aging problems in optocoupler devices, and the direct impact is that the stability of the power supply will deteriorate. In addition, the current sampling circuit and optical coupling of the output of the secondary side increase the cost of the power supply and reduce the market competitiveness.

Method used

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Embodiment Construction

[0017] exist Figure 1AAmong them, the conventional mains power, that is, the AC voltage Vac of the grid, outputs a DC input voltage Vin through the rectification of a bridge rectifier, and uses the DC input voltage Vin as the primary side input voltage of the isolated flyback converter. In the isolated flyback converter, a switch SW0 controlled by the pulse width modulation signal PWM is set to switch between off and on, and the switch SW0 is used to control the disconnection and conduction of the primary side winding of the transformer T. When the DC input voltage Vin is input to the transformer T, the output of the primary side of the transformer T is rectified by a diode to obtain the output voltage Vout at the output terminal, and an output capacitor is provided between the output terminal and the ground terminal GND to maintain the output The voltage Vout is in a relatively constant state, and the output voltage Vout provides a load output current Iout for the load (such ...

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Abstract

The present invention mainly relates to a system for controlling steady current in a power management device, more precisely, relates to a steady current control system that can be applied to manage LEDs. By controlling the control switch connected in series with the transformer on the primary side of the flyback transformer, a driving signal is generated to drive the control switch, so that the constant current output can be realized on the secondary side of the flyback transformer. way to drive power LED devices.

Description

technical field [0001] The present invention mainly relates to a system for controlling steady current in a power management device, more precisely, relates to a steady current control system that can be applied to manage LEDs. Background technique [0002] The light characteristics of conventional LEDs are usually described as being related to the current function, rather than directly related to the voltage function. Small changes in the forward voltage drop of LEDs can sometimes induce large current changes, which can reflect sudden changes in LED brightness from the senses. It is generally believed that the use of constant voltage driving cannot fully guarantee the consistency of LED brightness, thereby further inhibiting the long-term reliability or life of the LED, and causing negative light decay. In addition to the LED field, some civilian equipment, such as mobile phone chargers, must also have the functional characteristics of constant current output. [0003] For...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H02M3/335
Inventor 陈政佑
Owner CHINA RESOURCES MICROELECTRONICS (CHONGQING) CO LTD