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Power overload protection using hiccup mode

A technology of power output and power input, applied in the field of power converters, which can solve the problems of complex circuit design and high cost

Active Publication Date: 2016-03-30
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are expensive and result in complex circuit designs

Method used

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  • Power overload protection using hiccup mode
  • Power overload protection using hiccup mode
  • Power overload protection using hiccup mode

Examples

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Embodiment 1

[0038] will now refer to the attached figure 2 A first embodiment of the present invention is described.

[0039] figure 2 The circuit in shows a primary-side regulated flyback power supply circuit including an auxiliary primary-side transformer winding P2. As described above, the switch circuit SC1 is implemented using the switch MOSFET TR1 and the PWM controller U1. The drain terminal of MOSFET TR1 is connected to one side of the primary transformer winding P1 while the source of MOSFET TR1 is connected to the 0V voltage rail. The operation of the switch MOSFET TR1 is controlled by a signal output from a PWM controller as known in the art. Specifically, the gate drive terminal GCR of the PWM controller U1 is connected to the gate of the switch MOSFET TR1, so that the MOSFET TR1 can be turned on and off as required to control the energy supply of the primary coil P1. The ground terminal of the PWM controller U1 is connected to the low voltage rail (0V). Otherwise assume ...

Embodiment 2

[0069] will now refer to Figure 4 A second embodiment of the present invention is described. The components and operation of the circuit are the same as those of the first embodiment. However, in Figure 4 In , the comparator X1 and reference diode D2 and resistor R4 are replaced by an adjustable precision shunt regulator U2. The shunt regulator has an internal 2.5V reference connected to its comparator non-inverting input terminal.

[0070] The cathode of the shunt regulator is connected to the auxiliary winding P2 via a diode D5 and a resistor R6. The inverting pin (ref pin) of the shunt regulator U2 is connected to the error amplifier output terminal Vc of U1 through a resistor R12. As mentioned above, the inverting pin is connected to the midpoint between the resistor R12 and the capacitor C14, and the capacitor C4 is connected to 0V.

[0071] The output of the internal comparator (its cathode pin) is not directly connected to U1's voltage feedback pin, Vfb, because ...

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PUM

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Abstract

The invention provides a DC-to-DC converter witha power input terminal and a power output terminal. The DC-to-DC converter includes a transformer having a primary coil connected to an input terminal and a secondary coil S1 connected to an output terminal; a switching circuit having a switch TR1 and a switch controller U1 for controlling the duty cycle of the switch; the switching circuit having a first sense circuit for receiving a first signal fed back from an auxiliary winding P2 of the transformer and used to regulate the duty cycle of the switch and to initiate a hiccup mode when the first signal indicates an overload of the transformer; and a second sense circuit for detecting an over-current condition at the switch and / or primary winding; a further feedback path being provided between the second sense circuit and the first sense circuit for providing a second signal to the first sense circuit to boost the first signal when an overload is detected, and to initiate the hiccup mode.

Description

technical field [0001] The present application relates to power converters, and in particular to power converters having an overload protection function known as a hiccup mode ("hiccup mode"). Background technique [0002] In a flyback converter, the input and output sides of the circuit are isolated from each other via the primary and secondary windings of a transformer. To ensure reliable operation of the converter, a control signal indicative of the voltage or current condition of the transformer is transmitted from the output side to the input side of the converter control circuit so that the switching of the primary and secondary transformer coils can be properly regulated. Converter control circuits typically operate according to voltage mode control or current mode control, depending on the type of control signal used (eg voltage sense signal or current sense signal). [0003] Both control methods require a signal related to the output voltage of the transformer to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M3/335H02M1/00
CPCH02M1/08H02M1/32H02M3/33507H02H3/06H02H7/1213H02M1/0003
Inventor 弗兰克·沃恩斯
Owner MURATA MFG CO LTD
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