Switching power supply unit

• US 20080094859A1
• Filed: 10/23/2007
• Published: 04/24/2008
• Est. Priority Date: 10/24/2006
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Takayanagi, Yoshinobu, Sato, Kunihiro
• Granted Patent: US 7,800,922 B2
• Time in Patent Office: Days
• US Class Current: 363/17
• CPC Class Codes: H02J 9/067 using multi-primary transformers, e.g. transformer having one primary for each AC energy source and a secondary for the loads
• CPC Class Codes: H02M 1/009 having two or more independently controlled outputs for DC-DC converter with intermediate AC H02M3/33561
• CPC Class Codes: H02M 1/10 Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
• CPC Class Codes: H02M 3/33561 having more than one ouput with independent control
• CPC Class Codes: H02M 7/4807 having a high frequency intermediate AC stage
• CPC Class Codes: H02M 7/53871 with automatic control of output voltage or current

Abstract

A switching power supply unit is provided, which can output a DC voltage and an AC voltage with a minimized installation space. A switching circuit is provided between a winding of a transformer and a main battery. A rectifier circuit is provided between other windings of the transformer and an accessory battery. Output terminals for outputting an AC output voltage are provided at the other side of the transformer, the AC output voltage being generated based on a DC input voltage inputted from the main battery. A DC output voltage and the AC output voltage are generated based on the DC input voltage, and then outputted. The transformer is shared by a generation path of the DC output voltage and a generation path of the AC output voltage. An AC voltage input section to be inputted with the AC input voltage from external equipment may be provided at the other side of the transformer.

Claims

1. A switching power supply unit, comprising:

a transformer including a first transformer coil, a second transformer coil, and a third transformer coil, the transformer coils being magnetically coupled with one another,

a first switching circuit disposed between the first transformer coil and a first DC power supply,

a rectifier circuit disposed between the second transformer coil and a second DC power supply, and

a second switching circuit disposed between the third transformer coil and AC voltage output terminals.

2. The switching power supply unit according to claim 1:

wherein the transformer has a fourth transformer coil being magnetically coupled with the first transformer coil, the second transformer coil, the and third transformer coil respectively,

a third switching circuit disposed between the fourth transformer coil and AC voltage input terminals is further provided, and

the first switching circuit is configured to include a bidirectional switch.

3. The switching power supply unit according to claim 2:

wherein a power factor correction circuit is further provided between the third switching circuit and the AC voltage input terminals.

4. The switching power supply unit according to claim 2:

wherein the third transformer coil also serves as the fourth transformer coil, and

the third switching circuit is configured to include a bidirectional switch, and disposed between the third transformer coil and the AC voltage output terminals.

5. The switching power supply unit according to claim 3:

wherein the third switching circuit is configured to include a bidirectional switch, and disposed between the third transformer coil and the AC voltage output terminals.

6. The switching power supply unit according to claim 4:

wherein the second switching circuit is disposed between the third switching circuit and the AC voltage output terminals.

7. The switching power supply unit according to claim 5:

wherein the second switching circuit is disposed between the third switching circuit and the AC voltage output terminals.