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Device and method for revising output voltage of primary side feedback flyback type power module

A power module and output voltage technology, applied in the field of output voltage devices, can solve the problems of output voltage offset, lack of secondary side information, etc., and achieve the effect of overcoming output voltage offset

Inactive Publication Date: 2015-04-01
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the lack of information on the secondary side of this primary-side feedback flyback power module, the output voltage will deviate when there is an error in the resistor, the turns ratio of the transformer, the power supply voltage or the diode.
To obtain accurate output information, precise transformers and secondary side components are required, but this is a big problem for cost and mass production tubes

Method used

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  • Device and method for revising output voltage of primary side feedback flyback type power module
  • Device and method for revising output voltage of primary side feedback flyback type power module

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Embodiment Construction

[0010] figure 1 As an embodiment of the present invention, in the primary-side feedback flyback power module 10, the transformer T1 has a primary-side coil Lp and a power switch M1 connected in series between the power input terminal VIN and the primary-side ground terminal GND, and the secondary-side coil Ls is connected between the power supply output terminal Vout and the secondary side grounding terminal VSS, and the primary side auxiliary coil La induces the voltage of the secondary side coil Ls, so the output voltage Vo is indirectly measured, and the induced voltage Va is generated by the resistor R1 and R2 divides the voltage to generate a feedback voltage VFB to the control integrated circuit 12, and the control integrated circuit 12 provides a control signal Sc to switch the power switch M1 to convert the input voltage Vi into an output voltage Vo. In the control integrated circuit 12, the error amplifier 34 amplifies the difference between the reference voltage Vr2 ...

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Abstract

The invention discloses a device and a method for revising an output voltage of a primary side feedback flyback type power module. The difference value between the value of the output voltage of the power module and a target value is captured, and a reference voltage used for regulating the output voltage is regulated according to the difference value, so the value of the output voltage is revised to the target value.

Description

technical field [0001] The present invention relates to a primary side feedback flyback power module, in particular to a device and method for calibrating the output voltage of the primary side feedback flyback power module. Background technique [0002] Flyback power modules use a transformer to transfer power from the primary to the secondary. In order to obtain a feedback signal from the secondary side to adjust the output voltage, the secondary side needs a voltage sensor, such as a combination of a voltage regulator (shuntregulator) and an optocoupler. However, these circuits increase the size and cost of the power module. [0003] In order to reduce size and cost, there are also flyback power modules that obtain output information from the primary side to stabilize the output voltage, such as US Patent Nos. 5,438,499, 6,480,399, 6,721,192, 6,781,357, 6,833,692, 6,862,194, 6,967,472 and 6,977,824. However, due to the lack of information on the secondary side of this p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/10
Inventor 唐健夫陈曜洲戴良彬
Owner RICHTEK TECH
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