No-load control system of original-side feedback AC-DC switching power supply

A switching power supply and control system technology, applied in the direction of control/regulation systems, electrical components, and adjustment of electrical variables, can solve the problems of standby power consumption and dynamic characteristics that are difficult to do well at the same time

Active Publication Date: 2012-10-31
SHENZHEN WINSEMI MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to improve the standby power consumption and dynamic characteristics

Method used

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  • No-load control system of original-side feedback AC-DC switching power supply
  • No-load control system of original-side feedback AC-DC switching power supply
  • No-load control system of original-side feedback AC-DC switching power supply

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Such as figure 2 As shown, this embodiment provides a no-load control system for primary side feedback AC-DC switching power supply, the no-load control system by adding PWM control and line compensation unit and OR gate logic in the control chip, through the The PWM control and line compensation unit makes the no-load control system have extremely low standby power consumption in a wide input voltage range, such as in the voltage range of 85VAC-264VAC, and realizes PWM and Smooth transition of PFM control mode.

[0019] Wherein, the no-load control system includes a control chip 1, a transformer 3, and an NMOS tube 2, and the control chip 1 includes a secondary conduction time detection unit 101, a constant current frequency control unit 102, and an output voltage detection sampling unit 103 , constant voltage frequency control uni...

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PUM

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Abstract

The invention discloses a no-load control system of an original-side feedback AC-DC switching power supply. The no-load control system comprises a control chip, a transformer and an NMOS (N-channel Metal Oxide Semiconductor) tube, wherein the control chip is provided with a PWM (Pulse-Width Modulation) control and line compensation unit; one input end of the PWM control and line compensation unit is connected with an output voltage detecting and sampling unit, and another two inputs of the PWM control and line compensation unit are respectively connected with a feedback signal incoming pin FB and an original-side current detection signal incoming pin CS; and an output end of the PWM control and line compensation unit and a cycle-by-cycle current-limiting unit are respectively connected with an RS trigger through OR-logic. According to the no-load control system of the original-side feedback AC-DC switching power supply, the PWM control and line compensation unit generates a PWM control mode during medium-load and light-load, so that the original-side peak current in each period is lowered along with the lowering of the load and the system noise in light-load is favorably reduced; in addition, the line compensation is carried out on the lowest original-side peak value, so that the system has extremely low standby power consumption in a wide input voltage range; and the smooth transition between the PWM control mode and a PFM (Pulse Frequency Modulation) control mode is realized by the OR logic.

Description

technical field [0001] The invention relates to switching power supply technology, in particular to a no-load control system for primary side feedback AC-DC switching power supply. Background technique [0002] The primary-side feedback AC-DC control technology is a new type of AC-DC control technology developed in the last 10 years. Compared with the traditional secondary-side feedback switching power supply structure, its biggest advantage is that it eliminates the need for isolation chips and isolation A group of components that work together on a chip, which saves space on the circuit board, reduces cost and increases system reliability. The primary-side feedback DC power supply has a large market share in applications with high cost pressure such as mobile phone chargers, and applications with high volume requirements such as LED drive power supplies. [0003] attached figure 1 A structural block diagram of a primary-side feedback AC-DC power supply control chip and i...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02M1/08H02M1/44H02M3/335
Inventor 许煌樟
Owner SHENZHEN WINSEMI MICROELECTRONICS
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