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Method for measuring output current of flyback power adapter operated in discontinuous mode

A power converter and output current technology, which is applied in the direction of measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve the problems of reducing the overall conversion efficiency and loss of flyback power converters

Inactive Publication Date: 2015-04-15
LEADER ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The output current I of an existing flyback power converter out The measurement method is to connect an additional current-measuring resistor 44 in series with the connected electronic device, and then further obtain the output current I by measuring the voltage difference between the two ends of the current-measuring resistor 44. out size, however, the current sense resistor 44 due to the output current I out flow through will also cause losses and reduce the overall conversion efficiency of the flyback power converter

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  • Method for measuring output current of flyback power adapter operated in discontinuous mode
  • Method for measuring output current of flyback power adapter operated in discontinuous mode
  • Method for measuring output current of flyback power adapter operated in discontinuous mode

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Embodiment Construction

[0045] 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.

[0046] see figure 1 As shown, the first preferred embodiment of the flyback power converter of the present invention has a first side circuit 10 and a second side circuit 20 .

[0047] The first side circuit 10 has a rectifying unit 11 , a first coil 12 , a switch 13 , a PWM controller 14 and a first capacitor 15 .

[0048] The rectification unit 11 is a full-bridge rectification circuit and its two input terminals are used to electrically connect to an AC power supply V AC , the rectification unit 11 takes the AC power V AC It is converted into a pulsating DC power, and the pulsating DC power is output to the two output ends of the rectifying unit 11 . The first coil 12 and the switch 13 are connected in series between two output terminals of the rectifying u...

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Abstract

The invention discloses a method for measuring output current of a flyback power adapter operated in a discontinuous mode. The method includes measuring voltage of a switch node of the flyback power adapter so as to obtain a time interval of a switching period and a time interval of a closing stage of the switching period of the flyback power adapter, introducing to a formula to calculate the output current, where k is given constant, TOFF is the time interval of the closing stage and TSW is the time interval of the switching period.

Description

technical field [0001] The present invention relates to a method for measuring the output current of a flyback power converter operating in a discontinuous mode, in particular to a method for measuring the output current of a flyback converter that does not require an additional series connection of a current measuring resistor . Background technique [0002] Flyback power converters are often used for low-power AC-to-DC power conversion, such as Figure 8 As shown, the flyback power converter includes a first side circuit 30 and a second side circuit 40 . [0003] The first side circuit 30 has a rectifying unit 31 , a first coil 32 , a switch 33 , a PWM controller 34 and a first capacitor 35 . [0004] The rectification unit 31 is a full bridge rectification circuit and its input terminal is electrically connected to an AC power supply V AC , so that the AC supply V AC It is converted into a pulsating DC power supply and output to the two output terminals of the rectific...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 寇禾·芮妮·弗雷德利克白升右卢希鸿夏志男
Owner LEADER ELECTRONICS
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