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A power supply device and switching device technology, which is applied to output power conversion devices, electrical components, and irreversible AC power input to DC power output, etc. question

Inactive Publication Date: 2005-09-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Because the switch SW11 is controlled by pulse width, and the carrier frequency of the pulse width control is very high frequency compared with the power supply frequency at this time, there is a problem of generating high-frequency noise
Therefore, an additional filter circuit is required as a noise reduction countermeasure, resulting in an increase in manufacturing cost
In addition, when switching between full-wave rectification and voltage doubler rectification by the switch SW12, the output voltage fluctuates greatly.
That is, there is a problem that the voltage difference between the output voltage immediately before switching the operation mode and the output voltage immediately after switching is large.

Method used

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Embodiment 1

[0041] FIG. 1 is a circuit diagram for explaining the principle of the power supply device of the present invention.

[0042]As shown in the figure, the power supply device includes: a rectifier circuit 2 that inputs and rectifies the voltage of the AC power supply 1 through a reactor 3; capacitors 4 and 5 for voltage doubler rectification; Switches SW1 and SW2 at the connection point between the capacitors 4 and 5 for voltage rectification. The power supply device rectifies the voltage from the AC power source 1 and outputs a DC voltage of a desired magnitude to the load 8 . The load 8 includes a transformer for driving a compressor of an air conditioner, a refrigerator, or the like, a DC motor used in a washing machine, and the like.

[0043] The rectifier circuit 2 consists of a half-bridge of two diodes. Capacitor 4 and capacitor 5 are connected in series, and are connected to the output terminal of rectification circuit 2 . The switches SW1 and SW2 are respectively con...

Embodiment 2

[0070] use Figure 9 Another example of the method of controlling the switches SW1 and SW2 in the operation mode of the power supply device will be described.

[0071] Figure 9 It is a waveform diagram illustrating the control of the respective switches SW1 and SW2 in this embodiment. Such as Figure 9 As shown, the control of mode 1 in this embodiment is the same as image 3 The same is true for Example 1 shown. However, in the control of mode 2, in embodiment 1, the switch SW2 is always turned on, and the switch SW1 is controlled by the pulse width, while in this embodiment, the switch SW1 is always turned on (that is, the occupied The duty cycle is set to 100%), so that the fluctuation of the corresponding output voltage of the bidirectional switch SW2 composed of a semiconductor switch is controlled by the pulse width.

[0072] As in the first embodiment, even when the switches SW1 and SW2 are controlled as described above, the input current waveforms before and afte...

Embodiment 3

[0077] In Example 1, such as Figure 4 As shown, "1-pulse control" in which only one control pulse is applied to the switch SW1 in a half cycle of the power supply voltage is performed. In this example, if Figure 11 As shown in FIG. 2 , control is performed to apply two control pulses to the switch SW1 within a half cycle of the power supply voltage (hereinafter referred to as "two-pulse control"). At this time, the previous pulse is applied when the zero-cross point of the power supply voltage appears, and the subsequent pulse is applied around the time when the input current becomes zero during 1-pulse control. In addition, the pulse width of the subsequent pulse is made smaller than that of the preceding pulse. By performing such 2-pulse control, the input current can be conducted not only in period A but also in period B, so that the power factor can be further improved and power supply efficiency can be improved.

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PUM

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Abstract

The invention provides a power supply. This power supply is provided with a switch SW1 which is connected between an input terminal of a rectifier circuit 2 and a connecting point of capacitors 4, 5 for voltage-doubler rectifier, and a switch SW2 connected between the other input terminal of the rectifier circuit 2 and a connecting point of capacitors 4, 5. In the operation mode 1, the switch SW1 is continuously controlled to ON state only during the period up to the ON period which changes depending on an output voltage from the zero-crossing point of the power supply voltage, and the switch SW2 is always controlled to the OFF stage. In the operation mode 2, the switch SW1 is continuously controlled to the ON state only during the period up to the ON period from the zero-crossing point of the power source voltage, while the switch SW2 is always controlled to the ON state.

Description

technical field [0001] The present invention relates to a power supply device for converting a certain AC power into a desired DC power. Background technique [0002] In the power supply device used for electrical equipment such as air conditioners, it is necessary to solve the restriction requirements on high-order harmonics. As a method to solve the restriction on high-order harmonics, in the announcement of JP-P-10-111028, it is disclosed A method for improving power factor using active filters is presented. With the active filter, it is possible to improve the power factor and at the same time achieve the effect of boosting the power supply voltage. However, on the other hand, there is a problem that the scale of the circuit increases and the manufacturing cost increases. [0003] Therefore, JP-A-2000-188867 discloses a technique for achieving the same effect as an active filter with a simple configuration. Fig. 14 shows its circuit configuration. As shown in FIG. 14...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M7/00H02M7/02H02M7/06H02M7/10H02M7/12
CPCH02M1/38H02M7/21H02M1/0077
Inventor 京极章弘
Owner PANASONIC CORP
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