Unlock instant, AI-driven research and patent intelligence for your innovation.

Switching power supply unit

A technology of switching power supply and switching elements, which is applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc., and can solve the problems of output voltage waveform characteristic degradation and so on.

Active Publication Date: 2017-06-16
MURATA MFG CO LTD
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, if a transformer is installed after the emitter follower transistor, the high-order harmonic of the pulse voltage will cause resonance between the LC circuit formed by the inductance component of the transformer and the parasitic capacitance of the circuit, and the pulse Deterioration of output voltage waveform characteristics due to voltage overshoot and undershoot

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Switching power supply unit
  • Switching power supply unit
  • Switching power supply unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] refer to figure 1 , The switching power supply device 10 of this embodiment includes a 24V input power supply (DC voltage source) E1. The negative terminal of the input power supply E1 is connected to the ground, and the positive terminal of the input power supply E1 is connected to the collector of the NPN transistor Q1. The emitter of the transistor Q1 is connected to the emitter of the PNP transistor Q2, and the collector of the transistor Q2 is connected to the ground.

[0030] The voltage generating circuit 12 includes an NPN transistor Q3 having an emitter connected to the ground. The collector of transistor Q3 is connected to one terminal of resistance element R3, the other terminal of resistance element R3 is connected to the positive terminal of DC power supply E2, and the negative terminal of DC power supply E2 is connected to ground. In addition, the output voltage of the DC power supply E2 is variable within the range of 10V to 18V.

[0031] Clock generat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A pulse voltage is applied to one terminal of the resistance element (R1). One end of the resistance element (R2) is connected to the other terminal of the resistance element (R1). A capacitor (C1) is provided between the other terminal of the resistance element (R2) and ground. A diode (D1) and a capacitor (C2) are connected in parallel to the resistance element (R1), and a diode (D2) and a capacitor (C3) are connected in parallel to the resistance element (R2). The diode (D2) is arranged facing in the direction opposite to the diode (D1). The transistors (Q1) and (Q2) have control terminals connected to the other terminal of the resistance element (R2) to switch the input power supply (E1) on and off. A transformer (16) transforms an AC voltage generated by switching transistors (Q1) and (Q2) on and off.

Description

technical field [0001] The present invention relates to a switching power supply device, in particular to a switching power supply device that switches an input power supply applied to a switching element on and off based on a pulse voltage. Background technique [0002] An example of such a device is disclosed in Patent Document 1. According to this background art, a pulse voltage and a power supply voltage are applied to a base and a collector of an emitter follower transistor, respectively. The supply voltage is switched on and off according to the pulse voltage, whereby the same pulse voltage appears at the emitter of the emitter follower transistor. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: JP-A-60-134516 (Fig. 3, Fig. 4) [0006] Summary of the invention [0007] The problem to be solved by the invention [0008] However, if a transformer is installed after the emitter follower transistor, the high-order harmonic of the p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/537
CPCH02M7/537
Inventor 吉实贵史
Owner MURATA MFG CO LTD