Switching-mode power supply

一种开关电源、开关的技术，应用在输出功率的转换装置、电气元件、高效电力电子转换等方向，能够解决不能正确且容易同步整流用开关最佳控制等问题

Inactive Publication Date: 2007-05-16
SANKEN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the problem to be solved by the present invention is that the optimal control of the synchronous rectification switch cannot be performed accurately and easily, and the object of the present invention is to provide a switching power supply device capable of solving the above-mentioned problems.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] The switching power supply device constituted by the flyback type DC-DC converter of Embodiment 1 of the present invention shown in FIG. 1 includes: a pair of DC power supply terminals 1a, 1b as a DC voltage input unit connected to the DC power supply 1; A transformer 2 as an inductance unit; a main switch Q1 as an intermittent voltage supply unit; a synchronous rectification circuit 3; a smoothing capacitor Co; a pair of DC output terminals 4a, 4b connected to a load 4;

[0014] The DC power supply 1 is composed of a rectifying and smoothing circuit connected to a commercial AC power supply, a battery, etc., and supplies a DC input voltage Vin to a pair of DC power supply terminals 1a, 1b.

[0015] The transformer 2 as an inductance unit is composed of a primary winding N1 and a secondary winding N2 that are respectively wound around a magnetic core 6 and are electromagnetically coupled to each other. In this embodiment, as indicated by black dots, the primary winding ...

Embodiment 2

[0044] Next, a switching power supply device will be described based on Embodiment 2 shown in FIG. 4 . However, in FIG. 4 and FIGS. 5 to 16 described later, parts substantially the same as those in FIGS. 1 and 2 are denoted by the same symbols, and description thereof will be omitted. 1 and 3 are referred to in the description of FIGS. 4 to 16 .

[0045] The switching current device in FIG. 4 is formed in the same manner as in FIGS. 1 and 2 except that it has a modified synchronous rectification circuit 3a. In addition, the modified synchronous rectification circuit 3 a of FIG. 4 is formed in the same manner as that of FIG. 2 except for the modified synchronous rectification control circuit 7 a.

[0046] The synchronous rectification control circuit 7a of FIG. 4 is formed in the same manner as that of FIG. 2 except for the modified first current source 9a. The first collector resistor in the first current source 9a in FIG. 4 is connected between the collector of the second t...

Embodiment 3

[0048] The switching power supply device of the third embodiment shown in FIG. 5 has the same configuration as that of FIG. 1, FIG. 2 and FIG. 4 except for the modified synchronous rectification circuit 3b. In addition, the synchronous rectification circuit 3b of FIG. 5 is formed similarly to FIG. 4 except for the modified synchronous rectification control circuit 7b.

[0049] The synchronous rectification control circuit 7b of FIG. 5 omits the selective discharge diode 11a and the bias diode 11b of FIG. 4, and instead sets two voltage dividing resistors 31, 32, a comparator 33, and a reference voltage source 34 as discharge prohibition units. And the switch Q5 for discharge control is formed similarly to FIG. 4 except for this.

[0050] The third transistor Q13 in FIG. 5 is directly connected in parallel with the capacitor C1. A discharge control switch Q5 composed of FETs for turning on the third and fourth transistors Q13 and Q14 only during the OFF period of the main swit...

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PUM

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Abstract

The invention relates to a switching power supply in which the synchronous rectification switch of a synchronous rectification circuit can be turned on only for a desired time. The switching power supply comprises a main switch (Q1) connected with a DC power supply (1) through a primary winding (N1). The secondary winding (N2) is connected with a smoothing capacitor (Co) through a synchronous rectification element (Q2). The synchronous rectification element (Q2) comprises a parallel circuit of a synchronous rectification switch (8) and a diode (Do). In order to turn on the synchronous rectification switch (8) during a period where the diode (Do) is turned on, a capacitor C1, first and second current sources (9,10), a conductible period detecting means (13), and a comparison / pulse formation circuit (14) are provided.

Description

technical field [0001] The invention relates to a switching power supply device with a synchronous rectification circuit. Background technique [0002] A typical switching power supply device including a flyback type DC-DC conversion circuit consists of the following components, namely: A pair of DC power terminals; a transformer with a primary winding and a secondary winding; a main switch connected between the paired DC power terminals through the primary winding; a smoothing capacitor connected to the secondary winding through a rectifier diode. [0003] In the switching power supply device described above, if the main switch is ON / OFF controlled with PWM (pulse width modulation) pulses, the voltage between the paired DC power supply terminals is interrupted, and energy is stored in the transformer while the main switch is ON. , During the OFF period, energy is released from the transformer. The rectifier diode connected to the secondary winding conducts while the main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28
CPCY02B70/1475H02M3/33592Y02B70/10
Inventor 京野羊一
Owner SANKEN ELECTRIC CO LTD
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