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Power supply and bootstrap circuit thereof

A technology of power supply and bootstrap circuit, which is applied in the direction of instruments, electrical components, and adjustment of electrical variables, etc. It can solve the problems that the computer system is difficult to meet the energy-saving standards and the power loss of the resistor 102, etc., and achieves low power consumption and low power consumption. Effect

Inactive Publication Date: 2009-09-23
INVENTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this power supply is that although the PWM control circuit 106 consumes only a few tenths of a watt of power when driving the MOS transistor 108, the resistor 102 still consumes a large amount of power after the power supply is turned on, making it difficult for the computer system to operate. Meet the aforementioned energy-saving standards

Method used

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  • Power supply and bootstrap circuit thereof
  • Power supply and bootstrap circuit thereof

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Embodiment Construction

[0013] figure 2 It is a circuit diagram of a power supply and its bootstrap circuit according to an embodiment of the present invention. The power supply includes a bridge rectifier (Bridge Rectifier) ​​202 , a capacitor 204 , a transformer T1 , a switch 210 , a diode 212 , a capacitor 214 , a pulse width modulation (Pulse Width Modulation, PWM) control circuit 216 and a bootstrap circuit 218 . The bridge rectifier 202 has AC input terminals 202-1 and 202-2, and a positive power output terminal 202-3 and a negative power output terminal 202-4. One end of the capacitor 204 is coupled to the power output positive end 202-3, and the other end is coupled to the power output negative end 202-4 and the common potential GND. The transformer T1 has a primary coil 206 and a secondary coil 208 , and one end of the primary coil 206 is coupled to the power output positive terminal 202 - 3 . The switch 210 has a first terminal, a second terminal and a control terminal, and the first ter...

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Abstract

The invention discloses a power supply and a bootstrap circuit thereof. The bootstrap circuit comprises a transistor, a first capacitor, a first impedance and a voltage stabilizing circuit, wherein a collector and an emitter of the transistor are used as the input end and the output end of the bootstrap circuit respectively; one end of the first capacitor is coupled to the collector of the transistor; one end of the first impedance is coupled to the other end of the first capacitor; and the voltage stabilizing circuit is coupled to the other end of the first impedance and a base of the transistor to clamp the voltage of the base at a preset potential.

Description

technical field [0001] The present invention relates to a power supply and its bootstrap circuit, and more particularly to a power supply with low power consumption and a bootstrap circuit that only consumes power during startup. Background technique [0002] As the energy crisis is approaching, the awareness of environmental protection is gradually rising. In recent years, the US government has proposed energy-saving standards such as 80Plus and Energy Star (Energy Star), in order to regulate the energy consumption of electronic products. The above-mentioned energy-saving standards have been applied to computer systems, which limit the power consumption of the computer system in a standby state to be below 3W. In a computer system, the conversion efficiency of the power supply (Power Supply) is generally only 60% to 70%, resulting in a lot of electrical energy being converted into heat energy and dissipated in the air, making the power supply the main energy-consuming compo...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 夏春华刘士豪
Owner INVENTEC CORP