POWER SUPPLY CIRCUIT, POWER SUPPLY SYSTEM, AND ELECTRIC STORAGE DEVICE

• US 20140306672A1
• Filed: 04/01/2014
• Published: 10/16/2014
• Est. Priority Date: 04/11/2013
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: BELLALA, Raghunath, IMAMURA, Noritoshi
• Granted Patent: US 9,537,309 B2
• Time in Patent Office: Days
• US Class Current: 323/266
• CPC Class Codes: G05F 1/56 using semiconductor devices in series with the load as final control devices G05F1/461 takes precedence
• CPC Class Codes: H02J 1/00 Circuit arrangements for dc mains or dc distribution networks
• CPC Class Codes: H03K 17/0828 in composite switches
• CPC Class Codes: H03K 17/107 in composite switches

Abstract

There is provided a power supply circuit including a first series regulator including a first semiconductor element and a first constant voltage source, and a second series regulator including a second semiconductor element and a second constant voltage source, wherein the first series regulator and the second series regulator are cascaded and an input voltage to the first series regulator is a high voltage equal to or greater than 500 V.

Claims

1. A power supply circuit comprising:

a first series regulator including a first semiconductor element and a first constant voltage source; and

a second series regulator including a second semiconductor element and a second constant voltage source,

wherein the first series regulator and the second series regulator are cascaded and an input voltage to the first series regulator is a high voltage equal to or greater than 500 V.

2. The power supply circuit according to claim 1,

wherein the first semiconductor element and the second semiconductor element each include an input electrode, an output electrode, and a control electrode, and

wherein the first constant voltage source and the second constant voltage source are connected to the control electrode of the first semiconductor element and the control electrode of the second semiconductor element, respectively.

3. The power supply circuit according to claim 1,

wherein a detection unit configured to detect a value of at least one of the input voltage and the output voltage is provided, and

wherein, when the detection unit detects that the value is greater than a reference value, at least one of the first constant voltage source and the second constant voltage source is controlled and at least one of the first semiconductor element and the second semiconductor element is turned off.

4. The power supply circuit according to claim 1, wherein switches configured to vary voltage values by the first constant voltage source and the second constant voltage source are provided.

5. The power supply circuit according to claim 4, wherein the switch changes the voltage value in a temporal direction.

6. The power supply circuit according to claim 1, wherein a capacitor is provided in parallel to each of the first constant voltage source and the second constant voltage source.

7. The power supply circuit according to claim 6, wherein current limitation elements are connected to the control electrode of the first semiconductor element and the control electrode of the second semiconductor element.

8. A power supply system comprising:

an electric storage unit;

a switch element configured to control charging and discharging of the electric storage unit;

a control circuit configured to control the switch element; and

a power supply circuit configured to form operational power of the control circuit from a voltage of the electric storage unit,

wherein the power supply circuit has a configuration according to claim 1.

9. An electric storage device comprising:

the power supply system according to claim 8,

wherein direct-current power formed from an external power supply system is used as charging power of the electric storage unit, and

wherein output power of the electric storage unit is supplied to an electronic device.