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Primary-side feedback controlled switching power line loss compensating system and method

A line loss compensation, switching power supply technology, applied in the control/regulation system, electrical components, regulating electrical variables, etc., can solve the problem of increasing system cost, and achieve the effect of constant output voltage and compensation for line loss and voltage drop.

Active Publication Date: 2012-11-28
佛山市南海赛威科技技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] However, the primary side control constant current and constant voltage system designed with the above scheme and its variations has a major defect: in general, the voltage regulation is adjusted for a variable load
However, the external line loss compensation device will increase the system cost, so there is an urgent need for a built-in line loss compensation circuit to compensate for the change of the output voltage caused by Iout

Method used

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  • Primary-side feedback controlled switching power line loss compensating system and method
  • Primary-side feedback controlled switching power line loss compensating system and method
  • Primary-side feedback controlled switching power line loss compensating system and method

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Embodiment 1

[0074] see Figure 5 , the present invention discloses a switching power supply line loss compensation system with primary side feedback control, said system comprising: sample and hold circuit 10, constant voltage loop error amplifier 20, compensation network 30, adjustable low-pass filter 40, voltage current converter 50 . The sample-and-hold circuit 10, the constant-voltage loop error amplifier 20, the adjustable low-pass filter 40, and the voltage-to-current converter 50 are sequentially connected, and the output of the voltage-to-current converter 50 is connected to the sample-and-hold circuit 10; the compensation network 30 The input and output of the constant voltage loop error amplifier 20 are respectively connected.

[0075] The sample-and-hold circuit 10 performs platform sampling on the auxiliary winding through the FB pin, such as image 3 As shown, the output voltage is V_SH. The voltage V_SH is compared and amplified by the error amplifier 20 of the constant v...

Embodiment 2

[0088] see Figure 7 The difference between this embodiment and Embodiment 1 is that in this embodiment, the constant voltage loop error amplifier 20 is a fixed gain amplifier. The compensation network includes a first resistor Rc1 and a second resistor Rc2; one end of the first resistor Rc1 is connected to the reference voltage Vref, and the other end is connected to the negative pole of the fixed gain amplifier; one end of the second resistor Rc2 is connected to the negative pole of the fixed gain amplifier, and the other end is connected to the negative pole of the fixed gain amplifier. Connect the output of the fixed gain amplifier; the voltage V_SH is connected to the positive pole of the fixed gain amplifier. The constant voltage loop error amplifier 20 completes the function of amplifying with a fixed gain of Rc2 / Rc1.

[0089] To sum up, the switching power supply line loss compensation system and method proposed by the present invention can be applied to the line loss...

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Abstract

The invention discloses a primary-side feedback controlled switching power line loss compensating system and method. The system comprises a sampling and holding circuit, a constant voltage loop error amplifier, a compensating network, an adjustable low-pass filter and a voltage-current converter, wherein the sampling and holding circuit, the constant voltage loop error amplifier, the adjustable low-pass filter and the voltage-current converter are connected in sequence; the output of the voltage-current converter is connected with the sampling and holding circuit; and the compensating network is connected with the input and the output of the constant voltage loop error amplifier respectively. The primary-side feedback controlled switching power line loss compensating system and method provided by the invention can be applied to the line loss compensation which does not need external compensation of capacitor or resistor in the field of primary-side feedback, and is capable of compensating the line loss pressure drop of an output wire so as to realize constant output voltage.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and relates to a switching power supply controlled by primary side feedback, in particular to a line loss compensation system of a switching power supply controlled by primary side feedback; at the same time, the invention also relates to a switching power supply controlled by primary side feedback Line loss compensation method. Background technique [0002] Power converters are essential components in electronic systems. As we all know, power conversion includes two main types: linear converter and switching power converter, and can be divided into two types: isolated and non-isolated in terms of conversion methods. Switching power converters can achieve high conversion efficiency, so they are widely used in medium to high power applications, while in low power applications, especially systems below a few watts, linear converters are the mainstay. In recent years, switching power c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M7/217H02M3/335
CPCY02B70/126Y02B70/10
Inventor 林官秋叶俊李茂职春星
Owner 佛山市南海赛威科技技术有限公司
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