Constant current control unit suitable for primary side control and related control method
A constant current, control unit technology, applied in the direction of electrical components, control/regulating systems, regulating electrical variables, etc., can solve the misjudgment of the average output current, the maximum output current of the switching power supply 10 cannot be accurately equal, etc. question
Active Publication Date: 2016-12-21
LEADTREND TECH
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Problems solved by technology
Such a gap will cause the power controller 26 to misjudge the current average output current of the secondary side
Such a gap also leads to the fact that the maximum output current of the switch mode power supply 10 cannot be exactly equal to the preset maximum output current.
Method used
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[0072] image 3 An example of the internal structure of the power controller 27 implemented according to the present invention is given. The following is replaced by the power controller 27 figure 1 The power controller 26 is an embodiment of the present invention. figure 1 The switching mode power supply 10 is not intended to limit the implementation of the present invention.
[0073] The power controller 27 includes a protection unit 38 , a constant current control unit 40 , a constant voltage control unit 42 , and a logic control unit 44 . The logic control unit 44 switches the power switch 34 through the drive terminal GATE according to the output results of the protection unit 38 , the constant current control unit 40 , and the constant voltage control unit 42 .
[0074] Although the protection unit 38 , the constant current control unit 40 and the constant voltage control unit 42 are respectively coupled to the feedback terminal FB and the current detection terminal C...
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A constant current control unit suitable for primary side control and a related control method are suitable for a switch mode power supply for primary side control. The switching power supply includes a switch element and an inductance element. The constant current control unit includes a voltage waveform detector and a constant current controller. According to a feedback voltage signal and a delay signal, the voltage waveform detector generates a discharge time of the inductance element when the switch element is turned off. The feedback voltage signal corresponds to a reflected voltage of the inductance element. The delay signal is generated by delaying the feedback voltage signal. According to the discharge time and a current detection signal, the constant current controller generates an integral result. The integral result is used to control the switching element to stabilize the maximum output current of the switching power supply.
Description
technical field [0001] The present invention relates to primary side controlled switching mode power supplies. Background technique [0002] A power supply is an electronic device that is necessary for most electronic products. It is used to convert batteries or commercial power into power with specific specifications required by electronic products. Among the many power supplies, switching power supply has superior power conversion efficiency and compact product size, so it is widely welcomed by the power supply industry. [0003] Currently, there are two different control modes in the switching mode power supply: primary side control (PSC) and secondary side control (SSC). The SSC is directly coupled to the detection circuit at an output end of the primary side winding of a power supply, and then transmits the detection result to the power controller on the primary side through a photo coupler, so as to control the power supply. The energy to be stored and converted in t...
Claims
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IPC IPC(8): H02M3/335
Inventor 黄于芸沈逸伦
Owner LEADTREND TECH