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Switching power supply controller

A switching power supply and controller technology, applied in the direction of control/regulation systems, instruments, electrical components, etc., can solve the problems of increasing the number of chip pins and degrading performance, and achieve the effect of avoiding the number and increasing the protection function

Active Publication Date: 2014-10-15
GIANTEC SEMICON LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, the above-mentioned switching power supply controller lacks protection for the entire system under certain abnormal conditions, which makes the system continue to work under abnormal conditions, resulting in a sharp decline in performance
Generally speaking, to increase the detection of an abnormal situation, such as detecting the abnormality of the line voltage and the abnormality of the ambient temperature, additional pins need to be added correspondingly, which will lead to a significant increase in the number of chip pins

Method used

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Embodiment Construction

[0071] In summary, the embodiments of the present invention endow the switching power supply controller with multiple functions for detecting system abnormalities, and these functions can be implemented on one pin. Since the concentration of various detection signals on a pin will cause mutual interference, the switching power supply controller needs to be able to identify the required detection signals from the voltage and / or current of the pin.

[0072] Figure 4 Shows a system schematic diagram of an embodiment of the present invention. Figure 4 Shown is a flyback voltage adapter system with secondary side feedback. The function of the adapter is to convert alternating current (90V~260V) into a constant output voltage. Figure 4 From a system perspective, it shows the connection relationship between the control chip and the system. Reference Figure 4 As shown, the system includes input EMI filter 401, input rectifier (Rectifier) ​​402, switching power converter 403, feedback...

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Abstract

The invention relates to a switching power supply controller for a switching power supply system. The switching power supply system introduces line voltage detection resistance and negative temperature coefficient resistance to a detection end; the switching power supply controller comprises a processor, wherein the processor inputs detection voltage into the detection end and respectively samples first current which reflects the line voltage and second current which reflects ambient temperature from the detection voltage according to sampling signals at different moments and periodic control of a detection voltage value; and the detection end can also introduce a valley bottom detection function. Therefore, a plurality of detection functions are realized on one pin and cannot interfere with one another.

Description

Technical field [0001] The invention relates to a switching power supply system, in particular to the realization of a controller of the switching power supply system. Background technique [0002] Due to its many advantages compared with traditional linear power supplies, such as higher efficiency, lower standby power consumption, lower cost, smaller size and lighter weight, switching power supplies are becoming more and more popular Used in various electronic devices. [0003] figure 1 Shows the basic principle block diagram of the most widely used current mode switching power supply system. The system includes a switching power converter 101, a switching power supply controller 102, and a feedback network 103. The switching power converter 101 has a power input port IN and a power output port OUT. The switching power supply controller 102 outputs a switching control signal to the switching power converter 101, and the switching power converter 101 outputs a current control si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02M3/335
Inventor 王为刘慧明沈国平黄剑锋杨彪朱臻
Owner GIANTEC SEMICON LTD