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A New Current Detection and Control Circuit for Offline Switching Power Supply

A switching power supply, current detection technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve the problems of increasing the size of components, reducing reliability, and increasing production costs. , to achieve the effect of overvoltage and undervoltage protection

Active Publication Date: 2018-09-25
JIANGSU LIGEN ELECTRIC POWER ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of circuit, although common, has serious disadvantages; each additional winding of the transformer will increase the production cost, increase the size of components and reduce reliability
Especially when some switching power supplies only contain inductance and do not require a transformer, it is more prominent

Method used

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  • A New Current Detection and Control Circuit for Offline Switching Power Supply
  • A New Current Detection and Control Circuit for Offline Switching Power Supply
  • A New Current Detection and Control Circuit for Offline Switching Power Supply

Examples

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Embodiment Construction

[0039]Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0040] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0041] Figure 7 As shown, the present invention is Figure 5 Separately take out the primary part of the transformer on the basis of the above, add a resistor divider (the first resistor R71 and the second resistor R72) and the first capacitor C57, the third resistor R74, the fourth resistor R75 and the drain of the main switch tube. A high-pass filter circuit for the first diode D165. In this new circuit, th...

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Abstract

The invention discloses a new type current detection and control circuit of an off-line switching power supply. A high-pass filter is added after a resistance voltage divider circuit to extract the resonant frequency component of the drain-source voltage of the main switching tube, thereby obtaining the actual shut-off The time information is used to measure and calculate the output current in real time; the rectified input voltage signal in the system and the drain-source voltage signal of the main switch tube are used to enter the differential amplifier and comparator to obtain the timing information of the output voltage amplitude and current. In this way, the precise control of the output current can be realized without the need for additional windings of the transformer and direct sensing components.

Description

technical field [0001] The invention discloses a novel current detection and control circuit of an off-line switching power supply, which relates to the technical field of power electronics. Background technique [0002] The off-line switching power supply converts the input of power frequency AC power into a stable DC output, and realizes constant voltage or constant current under different load conditions. For this goal, sensing the output current or voltage or measuring it indirectly becomes an important task. Off-line switching power supply, whether it is isolated or non-isolated, the main circuit contains at least one magnetic component (inductor or transformer). In order to control the voltage and current value on the load side, the conventional method is to add a winding to the magnetic component. The sensing and detection function is completed by using the voltage or current signal induced by the secondary side on the auxiliary winding. [0003] figure 1 is a typi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
CPCH02M7/217H02M1/0009H02M1/007
Inventor 钱昶
Owner JIANGSU LIGEN ELECTRIC POWER ELECTRONICS TECH CO LTD
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