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Power supply device

A technology of power supply device and input power supply, applied in the direction of output power conversion device, electrical components, adjusting electrical variables, etc., can solve the problems of poor diode performance, influence, cost problems, etc.

Inactive Publication Date: 2000-05-24
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the shortcoming of this power supply circuit is that when the switching element (7) (the number in brackets is the number used in the prior art document, the same below) is turned on, it is composed of a series circuit of a diode (5) and a resistor (4). The discharge circuit of the capacitor (2) discharges the voltage of the capacitor (2), and when the switch element (7) is cut off, the reverse characteristic of the diode (5) is used to disconnect the discharge circuit, so that high voltage and high frequency voltage are applied to the diode , thus adversely affecting the performance of the diode based on the reverse leakage current, and the cost is also a problem due to the necessity of a high-voltage high-frequency diode

Method used

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Embodiment 2

[0052] FIG. 2 is a circuit configuration diagram of another embodiment. The difference from the embodiment in FIG. 1 is that a clamping circuit 48 composed of a resistor 46 and a diode 47 is added. The unnecessary pulse peak voltage generated by the control winding 37 of the switching transformer not only affects the control electrode of the switching element 35, but also has a bad influence on the on-off operation of the switch. Therefore, the voltage applied to the control electrode is clamped by the forward voltage drop (VF) of the diode 47 through the above-mentioned clamping circuit 48, and unnecessary pulse spike voltages are removed.

[0053] Here, the clamping circuit 48 is an element used to compensate the variation of the gate voltage threshold of the switching element 35 with temperature, of course, instead of a single diode, multiple diodes, Zener diodes, and combination circuits thereof are all fine.

[0054] In the above-mentioned embodiments, the output is deter...

Embodiment 3

[0057] Fig. 3 is a circuit configuration diagram of another embodiment of the present invention, as can be seen from this figure, the input power supply 51 is a DC power supply such as rectified and smoothed DC voltage of the commercial power or a car battery, and a resistor 52 and a resistor 52 are connected in series at both ends of the input power supply 51. The capacitor 53 is connected in parallel with the resistor 54 and the capacitor 53 . In addition, a series circuit of a switching transformer primary side coil 55 and a switching element 56 is connected to both ends of the input power supply, and a capacitor 57 is connected to both ends of the switching transformer primary side coil 55 .

[0058] The junction of the resistor 52 and the capacitor 53 is connected to one end of the switching transformer control winding 58 , and the other end of the control winding 58 is connected to the control pole of the switching element 56 .

[0059] A series circuit of a resistor 59 ...

Embodiment 4

[0068] Fig. 6 is a circuit configuration diagram of an embodiment of the present invention, which is an expanded example of the embodiment in Fig. 3, and only illustrates the difference from the embodiment in Fig. 3, the output of the peak voltage control circuit 64, that is, the collector of the transistor 62 is taken and the switching element 56 The structure in which the control poles are directly connected thus has the same effect as the embodiment in FIG. 3 .

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Abstract

An inexpensive highly reliable power supply for small-sized electronic devices, in order to attain the aim, a series circuit of a primary-side coil (34) of a switching transformer and a switching element (35) is connected between both ends of an input power source (31) and a series circuit composed of a resistor (32) and a capacitor (33) is also connected between both ends of the power source (31). The connecting point between the resistor (32) and capacitor (33) is connected to one end of the control winding (37) of the switching transformer and the other end of the winding (37) of the transformer is connected to the control terminal of the switching element (35). A discharge circuit (40) which is driven by signals from the control winding (37) of the transformer is used as a means for discharging the capacitor (33).

Description

technical field [0001] The present invention relates to a power supply unit for various electric appliances, and more particularly, to a non-contact power supply unit for small portable electric appliances such as cordless phones, mobile phones, PHS, camera-integrated video equipment, and personal computers. Useful power supply unit. Background technique [0002] Generally, there is known a power supply device that obtains an output on the secondary side by resonating the voltage of a capacitor connected to a coil on the primary side of a switching transformer and its both ends. [0003] As means for obtaining a stable output on the secondary side, various control circuit configurations on the primary side, control circuit configurations on the secondary side, and the like are also employed. [0004] First use the circuit diagram in Figure 15 to illustrate that a control circuit is set on the primary side as a control on the primary side. As one of the means of stabilizing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/34H02M3/335H02M3/338
CPCY02B70/16H02M1/34H02M3/33507H02M3/338H02M2001/344H02M2001/0032H02M2001/0045H02M3/33523H02M3/3385Y02B70/10H02M1/0032H02M1/0045H02M1/344H02M3/28
Inventor 大仓秀树大野信辻本悦夫桥本文明
Owner PANASONIC CORP