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Output current limiting control apparatus having input compensation

A compensation device and controller technology, which can be used in output power conversion devices, conversion of DC power input to DC power output, control/regulation systems, etc., and can solve problems such as increasing the cost of power supplies

Inactive Publication Date: 2011-01-26
NIKO SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] As mentioned above, in the case of overload, the output current Io will first increase greatly and then return to zero, which will cause an unfavorable situation that the output overcurrent is much larger than the full load current. It is necessary to improve the current resistance specifications of the transformer T1, output diode D2, and output capacitor C3. thus increasing the power supply cost

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  • Output current limiting control apparatus having input compensation
  • Output current limiting control apparatus having input compensation
  • Output current limiting control apparatus having input compensation

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Embodiment Construction

[0046] The spirit of the present invention is to utilize that when different input voltages are used as input power sources, the current detection signal on the primary side of the transformer will generate different levels accordingly. The magnitude of the feedback signal can be compensated by coupling the current detection signal to the feedback signal of the detection circuit at the output end, so that the overcurrent protection point can approach the same under different input power sources.

[0047]3 is a representative diagram of a switching power supply of the present invention, including a controller 100, a power switch Q1, a current detector R2, a transformer T1, an output detector 200 and a compensation device C5. The current detector R2 detects the current flowing through the primary side of the transformer T1, and generates a current detection signal to the current detection signal terminal CS of the controller 100, and the output detector 200 detects the output vol...

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Abstract

A pulse width adjustment controller comprises an output current limitation control of input voltage high and low compensation and can ensure the output over-current limit points tends to be consistent when the input voltage is different, thereby reducing the circuit cost of a power supply and simplifying the layout of a PCB circuit board. The switching power supply also comprises a transformer, apower switch, a first detection circuit, a second detection circuit and a controller. The controller comprises a control end, a first detection end and a second detection end, wherein, the control end is coupled with a controlled end of the power switch, the first detection end is coupled with the first detection circuit for receiving a first detection signal, the second detection end is coupled with the second detection circuit for receiving a second detection signal, and the controller carries out a protection action based on the signal received by the second detection end.

Description

technical field [0001] The invention is a pulse width adjustment controller with output current limiting control for high and low compensation of input voltage, which can ensure that the output overcurrent limit point tends to be consistent when the input voltage is different, and can reduce the cost of the power supply circuit and simplify the PCB circuit board layout. Background technique [0002] As shown in FIG. 1 , it is a known flyback power supply. After turning on the power supply, the input power supply VIN starts to provide power input, firstly, a small current is provided through the resistor R1 to slowly charge the capacitor C2. When the voltage of the capacitor C2 reaches the operating voltage VH, that is, the voltage of the power supply voltage VCC pin (VCC pin) reaches the operating voltage VH, the comparator UVLO outputs a low level signal to release the oscillator circuit OSC. At this time, the oscillation circuit OSC starts to operate, and outputs a pulse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335H02M1/32
Inventor 徐达经
Owner NIKO SEMICON