Novel step-down synchronous rectification switching power supply

A synchronous rectifier switch, a new type of technology, applied in electrical components, high-efficiency power electronic conversion, conversion of AC power input to DC power output, etc. Low noise and strong anti-interference ability

Inactive Publication Date: 2017-06-20
李福来
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although my country's switching power supply products have been widely promoted and applied, due to the limitation of the frequency and power consumption of traditional power devices, most switching power supply products use PWM technology with a frequency below 20KHZ, and their efficiency can only reach 60%~70 %

Method used

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  • Novel step-down synchronous rectification switching power supply
  • Novel step-down synchronous rectification switching power supply
  • Novel step-down synchronous rectification switching power supply

Examples

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Embodiment Construction

[0017] exist figure 1 In the ZVT synchronous rectification Buck converter, a ZVT synchronous rectification Buck converter is formed by combining the topology structure with the synchronous rectification Buck converter. The pulse signal is generated through an external circuit, and a series of pulse delay, undervoltage detection, pulse amplifier and pulse filtering are performed through the internal chip. operate. The modulated and converted pulse finally passes through the output circuit and drives three switches according to the designed switching time and sequence. Among them, the signal modulation circuit, the pulse conversion circuit and the switch output circuit can all be realized by the ZVT synchronous rectification Buck converter under the control of IC. Among them, A is the signal generation circuit PWM modulation, B is the pulse shaping and conversion circuit, and C is the switch pulse output circuit.

[0018] exist figure 2 Among them, when MOSFET is rectified, ...

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Abstract

A novel step-down synchronous rectification switching power supply is formed by an input circuit, a pulse generation circuit, a conversion circuit portion and a load portion. A novel switching power supply inversion circuit' with simultaneous application of synchronization rectification and a ZVT soft-switching technology applies a MOSFET with smaller impedance to replace a traditional diode at the rectification portion so as to realize synchronous rectification. The soft-switching technology is employed to realize the completion of conduction or turnoff of a switch tube in the condition of zero voltage or zero current. The novel step-down synchronous rectification switching power supply is wide in load range, small in overall loss, high in efficiency, high in capacity of resisting disturbance, low in noise and small in quiescent current, etc.

Description

[0001] Technical field [0002] The invention relates to a novel step-down synchronous rectification switching power supply. Background technique [0003] The problem of energy consumption of electronic products has become increasingly prominent, how to reduce its standby power consumption and improve power supply efficiency has become an urgent problem to be solved. Although the traditional linear regulated power supply has a simple circuit structure and high operating reliability, it still has the disadvantages of large volume, large consumption of copper and iron, low efficiency, high operating temperature and small adjustment range. In order to solve the problems caused by the traditional linear regulated power supply, people shifted the focus of research to the switching power supply. Although my country's switching power supply products have been widely promoted and applied, due to the limitation of the frequency and power consumption of traditional power devices, most ...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M1/088
CPCH02M1/088H02M7/217H02M1/0058H02M7/2195Y02B70/10
Inventor 李福来
Owner 李福来
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