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Switching power supply

一种开关电源、直流电源的技术，应用在电气元件、调节电变量、高效电力电子转换等方向，达到提高效率的效果

Inactive Publication Date: 2003-12-03
PANASONIC HEALTHCARE HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is the following problem: As shown in Figure 7A, at the input voltage V i When it is high, the frequency control starts with a large load power, and as shown in Figure 7B, at the input voltage V i When low, start frequency control with small load power

Method used

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  • Switching power supply
  • Switching power supply
  • Switching power supply

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0035] Fig. 1 is a circuit diagram of a switching power supply of the first embodiment.

[0036]In FIG. 1 , the other terminal of the DC power supply 1 with one terminal grounded is connected to one terminal of the auxiliary coil 16 of the output transformer 2 . The other terminal of the auxiliary coil 16 is connected to one output terminal of the switching element 3 . The other output terminal of the switch element 3 is grounded via the primary coil 15 of the transformer 2 , the rectifier diode 10 and the rectifier capacitor 11 . The other terminal of the oscillation capacitor 17 whose one terminal is grounded is connected to the frequency variable oscillation circuit 8 . The lowest frequency determining resistor 13 with one terminal grounded is connected to the frequency variable oscillation circuit 8 at the other terminal. The output terminal of the frequency variable oscillation circuit 8 is connected to a pulse width modulation circuit 9 . The output terminal of the pu...

no. 2 Embodiment

[0052] Fig. 3 is a circuit diagram of a switching power supply of the second embodiment.

[0053] The second embodiment further saves the power of the first embodiment.

[0054] In FIG. 3 , the same components as those in FIG. 1 are assigned the same reference numerals, and description thereof will be omitted. Components added to FIG. 1 are a starting resistor 51, a starting detection circuit 52, and a transistor 53 as a switching element. That is, the base of the transistor 53 is connected to the power supply 1 via the startup resistor 51 , and is connected to the startup detection circuit 52 . The emitter of the transistor 53 is connected to the connection point of the frequency variable oscillation circuit 8 and the pulse width modulation circuit 9 , and is connected to the connection point of the diode 10 and the capacitor 11 . The start detection circuit 52 is connected to the load power detection circuit 19 .

[0055] Next, the operation of the switching power supply ...

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PUM

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Abstract

A switching power supply has a switching circuit for supplying a predetermined output voltage regardless of load variations and converting input voltages into the predetermined output voltage; pulse width control circuit for controlling the switching circuit; a circuit for detecting load power; and an oscillation frequency variable oscillation circuit. Such arrangement can change the switching frequencies and prevent a decrease in efficiency under low load.

Description

technical field [0001] The present invention relates to a switching power supply device, and more specifically, to a switching power supply device capable of suppressing a decrease in efficiency when load power decreases, that is, switching loss at a low load. Background technique [0002] Fig. 4 is a circuit diagram of the existing switching power supply. [0003] In FIG. 4 , the switching element 310 switches the DC input voltage, converts it into AC, and outputs a stable output voltage at the secondary end of the transformer 360 through the output transformer 360 . The pulse width modulation circuit 320 controls the switching of the switching element 310 according to the feedback amount obtained by detecting the output voltage. The output voltage detection circuit 330 detects the output state, and feeds back a signal to the primary side of the transformer 360, so that the output voltage is lowered when the output voltage is higher than a predetermined voltage, and the ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12H02M3/24H02M3/28
CPCY02B70/16H02M3/28H02M2001/0032H02M3/33507H02M1/0032Y02B70/10
Inventor 小松明幸山市信武
Owner PANASONIC HEALTHCARE HLDG CO LTD