Control chip and its switching power supply
A technology for controlling chips and switching power supplies, applied to electrical components, output power conversion devices, irreversible AC power input conversion to DC power output, etc., can solve the impact of no-load power consumption, increase switching power consumption, and is not conducive to System integration and other issues to achieve the effect of reducing management costs, saving the number of chips, and improving system integration methods
Active Publication Date: 2022-05-24
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Problems solved by technology
However, in this method of arranging multiple control chips, on the one hand, arranging multiple control chips will increase the management cost for the production and delivery cycle of the switching power supply, and is not conducive to system integration; on the other hand, through the resistor Discharging the safety capacitor will increase the power consumption of the switching power supply, especially the no-load power consumption.
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[0068] The present invention is described below based on examples, but the present invention is not limited to these examples only. In the following detailed description of the invention, some specific details are described in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. Well-known methods, procedures, procedures, components and circuits have not been described in detail in order to avoid obscuring the essence of the present invention.
[0069] Furthermore, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
[0070] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is referred to as being "connected"...
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The application discloses a control chip and a switching power supply using the same. In the embodiment of the present invention, the control chip detects the voltage on the high-voltage pin to determine whether the high-voltage pin is coupled to the AC input voltage or the rectified voltage to generate a detection signal, and adaptively adjusts the control chip according to the detection signal With the discharge function of safety capacitors, only one chip is needed to meet different application requirements, saving the number of chips, reducing management costs and improving system integration.
Description
technical field [0001] The invention relates to power electronic technology, in particular to a switching power supply and a control chip thereof. Background technique [0002] The switching power supply receives the AC input voltage through the AC input terminal, and converts it into another fixed output signal or an adjustable output signal through different forms of architecture, so as to provide it for computers, automated office equipment and other electronic products. Usually a switching power supply includes a control chip and a power stage circuit. The control chip has multiple pins to receive or output signals. For example, the high-voltage pin receives the rectified voltage about the AC input voltage Vac, so as to provide the operating current required by the control chip when the switching power supply starts, and ensure that the switching power supply can start normally. [0003] In order to filter out electromagnetic interference (EMI) noise in the AC input vo...
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IPC IPC(8): H02M7/02H02M1/32
CPCH02M7/02H02M1/0006H02M1/322H02M7/06H02M1/44
Inventor 陈湛邓建黄秋凯
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD