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Switch power supply unit

A switching power supply and switching signal technology, which is applied in the direction of output power conversion devices, electrical components, and adjustment of electrical variables, can solve problems such as inability to respond flexibly

Inactive Publication Date: 2005-05-04
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the charging characteristic of the soft-start circuit is only linear, the defect of the above-mentioned prior art is that it cannot respond flexibly

Method used

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Embodiment Construction

[0036] Now, embodiments of the switching power supply device of the present invention will be described in detail with reference to the accompanying drawings.

[0037] According to the present invention, the charging characteristic of the soft start circuit used as the switching signal generating means changes from linear to nonlinear, so that the change of the primary resonance impedance characteristic of the isolation transformer becomes gentle, and therefore, the influence on the primary resonance impedance connected to the isolation transformer can be reduced. destruction of the switching element on the side.

[0038] Figure 4 The switching power supply device 10 of the present invention using the soft start circuit 50 is shown. The following will refer to Figure 5 The structure of the soft start circuit 50 is described.

[0039] In the soft start circuit 50 , the current path 74 of the first current mirror circuit 72 that charges the capacitor 52 with a constant curr...

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Abstract

Switching power supply device, including variable frequency oscillating circuit, driver, soft start circuit, switching element receiving switching signal, resonant capacitor connected to the connection point of switching element through transformer primary coil, rectifier circuit arranged on transformer secondary coil, rectifier An amplifier that compares the output voltage Vb of the circuit with a reference voltage Vref, a photocoupler that controls the impedance of the oscillating element of the variable frequency oscillating circuit based on the comparison output, and a charge voltage control circuit that controls the oscillation frequency when the variable frequency oscillating circuit is initially driven. The frequency control signal is non-linear with respect to time when the power is on.

Description

technical field [0001] The present invention relates to switching power supply devices. More specifically, it relates to a switching power supply device in which, when the power supply is activated, a rectified current flowing into the primary side of a transformer connected to a load side is formed for providing non-linear characteristics, thereby preventing excessive current from flowing into the primary side of the transformer switching transistors or similar devices. Background technique [0002] Known switching power supply arrangements are based on current resonance systems. figure 1 A general example of a switching power supply device for such a current resonance system is shown, which has a SEPP (Single-Ended Push-Pull) configuration. [0003] figure 1 The switching power supply device 10 shown includes a switching signal generator 12 , and the switching signal generator 12 includes a variable frequency oscillator circuit 14 and a driving circuit 16 . The oscilla...

Claims

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Application Information

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IPC IPC(8): H02M3/28
CPCH02M1/36H02M3/335H02M3/28
Inventor 永原清和
Owner SONY CORP
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