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Forward Converter and Secondary Side Switching Controller

A technology of forward converter and switch controller, which is applied in the direction of control/regulation system, high-efficiency power electronic conversion, output power conversion device, etc., can solve the problems of increasing the cost and size of the converter, increasing the complexity of the system, etc., to achieve The effect of reducing size and cost

Active Publication Date: 2017-08-25
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One disadvantage of the prior art converter of Figure 1 is that transformer T2 increases the cost and size of the converter
It also increases the complexity of the system

Method used

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  • Forward Converter and Secondary Side Switching Controller
  • Forward Converter and Secondary Side Switching Controller
  • Forward Converter and Secondary Side Switching Controller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] exist image 3 Of the various embodiments of the invention shown in -12, only those aspects of the converter that differ from the converter of FIG. 1 are described in detail.

[0030] image 3 A forward converter 20 is illustrated, which may have a conventional primary side PWM controller IC 12 , isolation transformer T1 , power MOSFET M1 , reset circuit 16 and Vout feedback circuit 13 , as in FIG. 1 . The PWM controller IC12 can control the power MOSFET M1 in the same way as it is in Fig. 1, but does not need to issue any control signals for the secondary side MOSFETs, so the transformer T2 in Fig. 1 is unnecessary .

[0031] exist image 3 In , all signals used to control the MOSFETs on the secondary side are generated on the secondary side. At least during continuous mode operation at moderate to high load currents, secondary side controller IC 22 detects signals on the secondary side and uses those signals to generate FG and M CG gate control voltage to ensure th...

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PUM

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Abstract

The present application relates to a forward converter and a secondary side switching controller. A forward converter has a primary side with a PWM controller for controlling switching of a power switch and has a secondary side coupled to the primary side via a transformer. The secondary side includes a forward transistor and a clamp transistor. A secondary side switch controller controls switching of the forward transistor and the clamp transistor without communicating with the primary side. The secondary side switch controller detects the rise and fall of the voltage at the ends of the secondary winding to control the switching of the forward transistor and the clamp transistor. A delay locked loop DLL is provided in the secondary side switch controller, the DLL turns on the clamp transistor when the power switch is turned off and turns off the clamp transistor a predetermined time before turning on the power switch. clamp transistor. A separate circuit controls the clamp transistors during discontinuous mode.

Description

technical field [0001] The present invention relates to a method of controlling a secondary side synchronous rectifier in an isolated DC / DC forward converter. In particular, the invention relates to controlling a secondary side rectifier without explicit communication with the primary side via an isolation boundary. Background technique [0002] Figure 1 illustrates one type of prior art forward converter. A forward converter is a DC / DC converter that uses a transformer to increase or decrease the output voltage relative to the input voltage (depending on the transformer winding ratio) and to provide isolation of the load. In a forward converter, unlike a flyback converter, energy is transferred to the output of the forward converter through transformer action during the conduction phase of the primary side switch. [0003] The maximum output voltage of the forward converter is constrained by the isolation transformer T1 turns ratio Ns / Np, where Ns is the secondary side wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/00
CPCH02M3/33553H02M3/33592H02M1/0009H02M1/0032Y02B70/10
Inventor G·K·尼兰詹
Owner ANALOG DEVICES INT UNLTD