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Switching power supply equipment

A technology of switching power supply and equipment, which is applied in the direction of conversion equipment, electrical components, and high-efficiency power electronic conversion with intermediate conversion to AC.

Inactive Publication Date: 2016-08-10
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As described above, there is a problem that it may be difficult to extend the holding time due to the stop of the overcurrent limiting circuit 6

Method used

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  • Switching power supply equipment
  • Switching power supply equipment
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Experimental program
Comparison scheme
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no. 3 approach

[0060]

[0061] Although the embodiments to be described hereinafter are preferred and various technically preferred limitations have been imposed on these embodiments, it should be understood that unless any limitation of the present disclosure is expressly indicated in the following description, otherwise The breadth and scope of the present disclosure is not limited to any of the following embodiments.

[0062]

[0063] The advantages of the present disclosure are as follows: The device according to the present disclosure detects the reduction or cut-off of the input voltage by directly monitoring the input voltage or by detecting the reduction of the voltage across the blocking capacitor, and when the operation of the device circuit and the load are not thresholded To the extent that changes are adversely affected, changes are made to the thresholds used when the overcurrent limiting circuit operates. By changing the threshold, more current can be drawn. By taking mor...

no. 1 example ”

[0073] Figure 8 A first example of the overcurrent limiting circuit according to the input voltage detection method is shown. In addition to the configuration of the overcurrent limiting circuit 61, Figure 8 The configuration shown in the Figure 4 The configuration shown in is the same. exist Figure 8 , the AC voltage on the input side of the AC / DC converter 3 is supplied to the anode of the diode 7a, and the cathode of the diode 7a is grounded via the resistors 7b and 7c. The capacitor 7d is connected in parallel with the resistor 7c. A rectified voltage of the input AC voltage is generated at a connection node between the resistor 7b and the resistor 7c.

[0074] The rectified voltage is supplied to a comparator 7e and compared with a DC voltage source 7f (threshold value 7f) by the comparator 7e. When the voltage applied to the (+) input of the comparator 7e (hereinafter referred to as Vin+) is higher than the voltage applied to the (-) input of the comparator 7e ...

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Abstract

A switching power supply device comprising: a switching DC-DC converter for receiving an input voltage; a current detection unit for detecting a current from the DC-DC converter; an input voltage detection unit for detecting a decrease in the input voltage or cut off; an overcurrent limiting circuit for stopping the operation of the DC-DC converter when the current detected by the current detection unit exceeds a threshold value; and a threshold value control unit for changing the threshold value of the overcurrent limiting circuit so that if input The voltage detection unit detects a decrease or cut-off of the input voltage, and extends a time period between when the decrease or cut-off of the input voltage is detected and when the operation of the DC-DC converter is stopped.

Description

technical field [0001] The invention relates, for example, to a switching power supply device with a resonant switching converter. Background technique [0002] Switching power supply devices equipped with various resonant converters are widely used. High power conversion efficiency can be easily realized by the resonant converter, and since the switching waveform of the resonant converter is basically a sine wave, low noise characteristics can also be realized. In addition, the resonant converter has the advantage of being configured with a relatively small number of components. [0003] As a typical configuration of the resonant converter, a configuration employing a half-bridge coupling system in which a switching circuit composed of two switching elements connected in series is arranged in parallel for a DC input voltage is widely used. A current resonant converter employing a half-bridge coupling system is configured such that two switching elements are turned on / off ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28
CPCH02M1/32H02M3/33507Y02B70/10H02M1/0022H02M1/325
Inventor 高木和贵
Owner SONY CORP