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Power supply unit

A technology of power supply device and DC power supply, which is used in circuits, output power conversion devices, electrical components, etc.

Inactive Publication Date: 2007-04-25
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if the discharge is stable, the load value of the high pressure discharge lamp is not always stable

Method used

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no. 1 example

[0049] Fig. 1 is a circuit diagram of a power supply unit according to a first embodiment of the present invention. In FIG. 1, the same reference numerals are used to designate the same or similar elements as those in FIG. 3, and their descriptions are omitted.

[0050] In the power supply device shown in FIG. 1 , the resistor R2 as the first resistor is connected in parallel to the capacitor C5 as the first capacitor, and the first capacitor is also provided in the power supply device 10 of FIG. 3 . The rest of the structure is the same as that of the power supply device 10 . In this embodiment, the resistance value of the resistor R2 is set to 2.4 kΩ.

[0051] In the power supply unit 20 having the above structure, even when trying to charge the capacitor C5 in the reverse direction of normal operation when the load is light, since the charge is discharged through the resistor R2, the charging of the capacitor C5 in the reverse direction can be ignored. Thereby, generation...

no. 2 example

[0057] Fig. 2 is a circuit diagram of a power supply unit according to a second embodiment of the present invention. In FIG. 2, the same or similar elements as those in FIG. 1 are denoted by the same reference numerals, and their descriptions are omitted.

[0058] In the power supply unit 30 shown in FIG. 2 , a diode D5 connected in series with the resistor R2 as the first resistor is provided as a fourth diode, and the first resistor is also provided in the power supply unit 20 of FIG. 1 . That is, a series circuit including a resistor R2 and a diode D5 is connected in parallel with a capacitor C5. Diode D5 is arranged such that its cathode is connected to MOSFET Q2. The rest of the structure is the same as that of the power supply device 20 .

[0059] In the power supply device 30 having the above structure, even if an attempt is made to charge the capacitor C5 in the reverse direction at start-up, since the charge is discharged through the resistor R2 and the diode D5, th...

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PUM

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Abstract

A power supply unit in which the source of an MOSFET (Q1) is connected with the joint of a rectifier diode (D1) and a choke coil (L1) through a resonance coil (L2), a series circuit of the resonance coil (L2) and the rectifier diode (D1) is connected in parallel with a series circuit of a capacitor (C5) and an MOSFET (Q2), and the MOSFETs (Q1) and (Q2) are driven by PWM control such that they are turned on alternately while interposing a turn off period. In the power supply unit, the capacitor (C5) is connected in parallel with a resistor (R2).

Description

technical field [0001] The present invention relates to a power supply device, in particular to a power supply device for lighting a DC (direct current) working high-pressure discharge lamp. Background technique [0002] For example, a high-pressure discharge lamp that is lit by applying a DC voltage and used as a lamp of a projector is available. Although the air pressure inside the high-pressure discharge lamp is relatively low when the lamp is not lit (at room temperature), after the start of the discharge, the air pressure rises as the temperature rises. Since the discharge occurs more easily when the air pressure inside the discharge lamp is lower, the discharge is more likely to occur when the discharge starts, and the discharge lamp acts as a load with a lower resistance. On the contrary, after the temperature rises due to the lighting of the discharge lamp, discharge is relatively less likely to occur, and the discharge lamp acts as a load, and its resistance is hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/158H01L2924/0002H01L2924/00H02M3/155
Inventor 藤野正人渡部聪一
Owner MURATA MFG CO LTD
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