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Power source protector

A technology of power protection and switching power supply, applied in the field of protection devices of switching power supply, can solve problems such as difficulty in distinguishing the cause of stop

Inactive Publication Date: 2009-08-05
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a configuration, the application of excessive voltage input to the primary side continues
In addition, in the configurations of Patent Documents 1 to 3, since the protection against excessive voltage is completed only around the power supply, the operation of the equipment for which the cause of the stop is not determined is stopped.
Therefore, there is a problem that it is difficult for the user to tell whether the cause of the stop is an abnormality of excessive voltage application.

Method used

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Examples

Experimental program
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Effect test

Embodiment approach 1

[0034] figure 1 is a configuration diagram of the power protection device in Embodiment 1 of the present invention, figure 2 is its representative action waveform diagram, image 3 It is a waveform chart showing an example of a change in the voltage applied to the excessive voltage detection unit. Hereinafter, for the configuration and operation of the power protection device according to Embodiment 1, refer to Figure 1 to Figure 3 Be explained.

[0035] The basic configuration of the power supply protection device according to Embodiment 1 is as follows: figure 1 As shown, it includes a flyback switch that is started by the rise of the DC voltage input on the primary side and continues the switching operation based on the voltage Vds generated by the output current Id1 of the auxiliary winding 4a of the switching transformer 4 fed back from the secondary side after the startup. power supply.

[0036] In Embodiment 1, the above-mentioned flyback switching power supply...

Embodiment approach 2

[0045] Figure 4 It is a configuration diagram of a power protection device according to Embodiment 2 of the present invention. Hereinafter, for the configuration and operation of the power protection device according to Embodiment 2, refer to Figure 4 Be explained.

[0046] exist Figure 4 In the power protection device according to Embodiment 2, an overvoltage detection unit 6 independent from the control unit 2 is provided, and the detection result of the output voltage is monitored by a microcomputer 7 which controls the device. For example, when an excessive voltage such as the voltage at the time of double voltage application is detected, all control is stopped, and the state becomes a standby state. In addition, it is a configuration in which an abnormal display such as blinking of a specific monitor LED is performed on the display unit 8 connected to the microcomputer 7 .

[0047] In Embodiment 1, when an excessive voltage is applied, the excessive voltage detecti...

Embodiment approach 3

[0052] Figure 5 It is a configuration diagram of a power protection device according to Embodiment 3 of the present invention. Hereinafter, for the configuration and operation of the power protection device according to Embodiment 3, refer to Figure 5 Be explained.

[0053] exist Figure 5 Among them, the power protection device according to Embodiment 3 is characterized in that it includes: an input unit 9 that makes the rectifier circuit 1 as a DC voltage generating circuit have a constant DC resistance value R; a bypass unit 10 that is connected in parallel with the input unit 9 Connections have transformation functions. The bypass unit 10 is controlled by the microcomputer 7 . According to such a configuration, when an excessive voltage such as a double voltage is applied, a voltage drop occurs in the DC resistance portion R of the input unit 9, and the input to the rectifier circuit 1 drops due to the voltage drop. That is, the voltage applied to the switching powe...

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PUM

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Abstract

PROBLEM TO BE SOLVED: To solve the problem wherein the replacement of components is required and the costs of components are increased by using components having a high-breakdown voltage in a breaking system utilizing a conventional current fuse and the protection system of a switching power supply, or the like having wide input specifications even if applying AC 200V to a switching power supply having AC 100V specifications. SOLUTION: A flyback system switching power supply comprises a control unit 2 for controlling switching; an overvoltage detector 6 for detecting an output voltage in auxiliary winding 4a and continuously stopping the control unit 2 when the output voltage becomes a fixed level or larger; a feedback section 5 for feeding back secondary-side output to the control unit 2; and a switching transformer 4 having excessive voltage detection winding 4b wound forward. When an excessive voltage is applied, the power supply is continuously stopped for protecting a switching element 3, or the like.

Description

technical field [0001] The present invention relates to a protection device for a switching power supply that obtains electric power through high-frequency switching (hereinafter, simply referred to as a "power supply protection circuit"). Background technique [0002] Conventional withstand voltage protection of main switching elements is assumed to be implemented in a country such as Japan, which has a commercial power supply of, for example, 100V or 200V as a power supply. The structure of the withstand voltage protection of such a main switching element, as a first structure example, is composed of a surge absorbing element that becomes a short-circuit mode when a voltage above a certain value is applied, and a current fuse that becomes a current cut-off circuit when a short-circuit mode is applied. . As a second configuration example, it is configured using a wide input standard in which the input voltage range is set to a wide range. As a third configuration example,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/20
CPCH02H3/20
Inventor 上岛敬人知野见岳人
Owner PANASONIC CORP
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