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

Switching power supply

一种开关电源、开关控制电路的技术，应用在输出功率的转换装置、电气元件、有中间变换为交流的变换设备等方向，能够解决延迟、花费时间变压器或电感器判断等问题，达到准确保护的效果

Inactive Publication Date: 2010-09-08
MURATA MFG CO LTD
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the method of converting the current flowing through the path of the current protection object into a voltage signal for sampling and calculating its absolute value is used in order to detect overcurrent by using a digital control circuit, the absolute Another problem is that it takes time to reach the value, so there is a delay in judging whether the transformer or inductor has magnetic saturation.

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
  • Switching power supply
  • Switching power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] figure 2 It is a circuit diagram of the switching power supply device 100 according to the embodiment of the present invention. exist figure 2 Among them, the transformer T1 has a primary winding N1 and secondary windings N21 and N22, and a switching circuit SW is connected to the primary winding N1. The switching circuit SW consists of four switching elements QA, QB, QC, and QD connected in bridge constitute. Between the input power supply 21 and the switching circuit SW, a filter circuit including a common mode choke coil CH, bypass capacitors C1 to C6, and a current transformer (current transformer) CT are provided. A resistor R3 is connected to the secondary side of the current transformer CT to form a current detection circuit CD, and the current flowing through the primary side is taken out as a voltage signal.

[0025] The drive circuit 31 is connected to the four switching elements QA to QD of the switching circuit SW.

[0026] A rectification and smoothin...

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 switching power supply comprises a transformer or an inductor, a switching element connected with the transformer or the inductor and switching an input power supply, and a digital control circuit for detecting the current / voltage of control object and performing on / off control of the switching element depending on the detection value. The sampling timing is set for n points or more (n is an integer of 3 or more) during an on-period excepting the turning on timing or turning off timing of the switching element, presence or absence of magnetic saturation of the transformer or the inductor is detected based on the fact whether the inclination of temporal variation in current value exceeds a predetermined value or not, and circuit operation is protected against the magnetic saturation. Consequently, presence of magnetic saturation can be detected surely with high speed without being affected by switching noise.

Description

technical field [0001] The invention relates to a switching power supply device using a digital control circuit for switching control. Background technique [0002] Conventionally, as one of the protection circuits of switching power supply devices, an overcurrent protection circuit has been designed which detects the current flowing through the main switching element and turns off the main switching element when the current value reaches a predetermined value (see Patent Document 1 ). [0003] figure 1 An example of the switching power supply device of Patent Document 1 is shown. [0004] figure 1 The switching power supply device shown is constituted as follows: a series circuit of a primary winding 2a of a transformer 2 and a semiconductor switching element 3 is connected to both ends of a DC power supply 1, and a diode 4 is connected to the secondary winding 2b of the transformer 2. The energy accumulated in the transformer 2 during the ON period of the switching ele...

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 Applications(China)
IPC IPC(8): H02M3/28
CPCH02M3/33515H02M3/3376H02M2001/0012H02M1/40H02M1/0012
Inventor 西山隆芳原隆志植木浩一
Owner MURATA MFG CO LTD