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Switched power supply conversion device capable of improving conversion efficiency and method

A power conversion and conversion efficiency technology, which is applied in the direction of converting irreversible DC power input into AC power output without intermediate conversion to AC conversion equipment, etc. Inefficiency, etc.

Inactive Publication Date: 2013-05-15
CYBER POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] It is known that the power switch of the power converter in the above-mentioned switching power conversion device is a transistor. When the transistor is turned from off to on or from on to off, there will be switching loss and heat energy. When light load, use Too high a switching frequency will increase the switching loss of the transistor, which will reduce the efficiency of the switching power conversion device; and under heavy load, using too low a switching frequency will cause the output current ripple to be too large, so the switching power conversion device uses Fixed switching frequency has its disadvantage of poor efficiency

Method used

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  • Switched power supply conversion device capable of improving conversion efficiency and method
  • Switched power supply conversion device capable of improving conversion efficiency and method
  • Switched power supply conversion device capable of improving conversion efficiency and method

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Embodiment Construction

[0025] The technical means adopted by the present invention to achieve the intended invention purpose are further described below in conjunction with the drawings and preferred embodiments of the present invention.

[0026] For the switching power conversion method that can improve the conversion efficiency of the present invention, please refer to figure 1 Shown:

[0027] A switching frequency of a power switch is controlled by a pulse width modulation controller, and the following steps are performed:

[0028] Make the PWM controller control the switching frequency of the power switch with a first frequency (step 101);

[0029] Obtain the load current (step 102);

[0030] Judging the light and heavy load state of the load (step 103);

[0031] If it is judged as light load, generate a light load frequency conversion signal according to the load current and light load state, and send it back to the pulse width modulation controller (step 104);

[0032] Make the pulse width...

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Abstract

The invention discloses a switched power supply conversion device capable of improving conversion efficiency and a method. A direct-current power supply is enabled to be connected with a load through a power supply converter. The power supply converter is provided with more than one power switch. A first frequency is output by a pulse width modulation controller and is used for controlling the switching frequency of the power switch. A load current is detected by a current detector. A frequency conversion signal is produced by adding a judging condition and is sent to the pulse width modulation controller. The pulse width modulation controller is enabled to output a variable second frequency to adjust the switching frequency of the power switch. The judging condition is that the load is judged to be a light load or a heavy road according to the load current. When the load is the light load, the second frequency is reduced to reduce switching loss of the power switch. When the load is the heavy load, the second frequency is improved to reduce ripples of the load current of the heavy load. And then cost of the switched power supply conversion device is reduced, and conversion efficiency is improved as well.

Description

technical field [0001] The invention relates to a switching power conversion device, in particular to a switching power conversion device and method capable of improving conversion efficiency. Background technique [0002] In the existing switching power supply conversion device, a DC power supply is connected to a load through a power converter. The power converter includes more than one power switch. When the power switch is turned on, the DC power supply is connected to the load. When the power switch is cut off, the DC power supply connected to the load is cut off; a pulse width modulation controller drives the power converter to switch the power switch in a pulse width modulation mode; the pulse width modulation works by using a reference After comparing the voltage with the load voltage of the load, a control signal is output, and the control signal is calculated with the load current, and finally the pulse width modulation controller outputs a switching frequency with...

Claims

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Application Information

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IPC IPC(8): H02M3/10H02M7/48
Inventor 林育志陈少崇
Owner CYBER POWER SYST
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