RESONANT CURRENT LIMITING DEVICE

• US 20160056711A1
• Filed: 08/07/2015
• Published: 02/25/2016
• Est. Priority Date: 08/19/2014
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: UMETANI, Kazuhiro
• Granted Patent: US 9,590,491 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02M 1/0058 by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826
• CPC Class Codes: H02M 1/32 Means for protecting converters other than automatic disconnection
• CPC Class Codes: H02M 3/1582 Buck-boost converters H02M3/1584 takes precedence
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A resonant current limiting device, for a resonant current passage having a loop shape including at least one capacitor and a wiring passage with at least one inductor or inductance component, includes: an electric storage element connected in series with the capacitor; a driving power source; and a voltage controller that charges and discharges an electric charge in the electric storage element, which is supplied from the driving power source, controls a terminal voltage of the electric storage element to be a predetermined instruction voltage, and restricts a resonant current component flowing through the wiring passage.

Claims

1. A resonant current limiting device for a resonant current passage having a loop shape including at least one capacitor and a wiring passage that includes at least one inductor or at least one inductance component, the resonant current limiting device comprising:

an electric storage element connected in series with the capacitor;

a driving power source; and

a voltage controller that charges and discharges an electric charge in the electric storage element, which is supplied from the driving power source, controls a terminal voltage of the electric storage element to be a predetermined instruction voltage, and restricts a resonant current component flowing through the wiring passage.

2. The resonant current limiting device according to claim 1,

wherein a direct current power source is connected to a series circuit of the capacitor and the electric storage element.

3. The resonant current limiting device according to claim 1,

wherein a series circuit of the capacitor and the electric storage element is connected in parallel to a power source terminal of an electric device without passing through the wiring passage;

and

wherein the electric device is energized from a power source and functions.

4. The resonant current limiting device according to claim 3,

wherein one end of the power source terminal of the electric device is connected to the electric storage element.

5. The resonant current limiting device according to claim 3,

wherein the driving power source is the power source for energizing the electric device, and

wherein the power source is disposed in the electric device.

6. The resonant current limiting device according to claim 3,

wherein the capacitor is defined as a first capacitor, and the electric device is defined as a first electric device,

wherein the series circuit of the first capacitor and the electric storage element is connected in parallel to a power source terminal of a second electric device with passing through the wiring passage, and

wherein the second electric device is connected to a second capacitor and a second power source to be energized and function.

7. The resonant current limiting device according to claim 1,

wherein the voltage controller determines the predetermined instruction voltage to remove a voltage variation in a frequency range including at least a resonant frequency of the resonant current passage from a sum of voltage to be applied to a whole of inductance in the resonant current passage.

8. The resonant current limiting device according to claim 1,

wherein the voltage controller determines the predetermined instruction voltage to remove a voltage variation in a frequency range including at least a resonant frequency of the resonant current passage from a calculation result of adding a voltage applied to the capacitor connected in series with the electric storage element to a sum of voltage to be applied to a whole of inductance in the resonant current passage.

9. The resonant current limiting device according to claim 1,

wherein the voltage controller determines the predetermined instruction voltage to set a voltage variation applied to the electric storage element to be proportional to a current variation in the resonant current passage in a frequency range including at least a resonant frequency of the resonant current passage.

10. The resonant current limiting device according to claim 1,

wherein the voltage controller determines the predetermined instruction voltage to set a voltage variation applied to a series circuit of the electric storage element and the capacitor to be proportional to a current variation in the resonant current passage in a frequency range including at least a resonant frequency of the resonant current passage.

11. The resonant current limiting device according to claim 1,

wherein the electric storage element is another capacitor.

12. The resonant current limiting device according to claim 1,

wherein a capacitance of the electric storage element is larger than a capacitance of the capacitor connected in series with the electric storage element.

13. The resonant current limiting device according to claim 1,

wherein the resonant current passage further includes at least another capacitor different from the capacitor connected in series with the electric storage element, and

wherein a capacitance of the capacitor connected in series with the electric storage element is smaller than a capacitance of the at least another capacitor.

14. The resonant current limiting device according to claim 1,

wherein a direct current voltage of the driving power source is lower than a direct current voltage applied to the capacitor.

15. The resonant current limiting device according to claim 1,

wherein the voltage controller is a switching power source circuit.

16. The resonant current limiting device according to claim 1,

wherein the voltage controller determines the predetermined instruction voltage to maintain a polarity of a voltage applied to the electric storage element.