# US 2014/0197737 A1 · Electrical Equipment

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- Number: US 2014/0197737 A1
- Document ID: US20140197737A1
- Status: Published application
- Kind: A1
- Application number: 14/239,933
- Filed: 2011-09-22
- Published: 2014-07-17
- Earliest claimed: 2011-09-22
- Assignees: Toshiba Lighting & Technology Corporation
- Inventors: Yuji Takahashi; Noriyuki Kitamura
- Web page: https://patentgrep.com/patent/US20140197737A1

## CPC

- H05B 47/10: Controlling the light source
- H02M 1/08: Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- H05B 47/26: Circuit arrangements for protecting against earth faults
- H02M 1/0064: {Magnetic structures combining different functions, e.g. storage, filtering or transformation}
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

Electrical equipment includes a switching power source, a rectifier circuit, a pair of capacitative elements, and a load. The switching power source outputs an alternating-current voltage with input of a direct-current or an alternating-current power source voltage. The pair of capacitative elements are connected between the switching power source and the rectifier circuit and insulate the switching power source and the rectifier circuit. The load is connected as a load circuit to an output of the rectifier circuit and driven by a constant current.

## Claims

### Claim 1

Electrical equipment comprising:
a switching power source that outputs an alternating-current voltage with input of a direct-current or an alternating-current power source voltage;
a rectifier circuit;
a pair of capacitative elements that are connected between the switching power source and the rectifier circuit and insulate the switching power source and the rectifier circuit; and
a load that is connected as a load circuit to an output of the rectifier circuit and driven by a constant current.

### Claim 2 (depends on 1)

The equipment according to claim 1, further comprising a protection circuit that detects degradation of insulation performance of at least one element of the pair of capacitative elements and stops an operation of the switching power source.

### Claim 3 (depends on 2)

The equipment according to claim 2, wherein the protection circuit includes a detection circuit that detects at least one of an output current and an output voltage of the switching power source.

### Claim 4 (depends on 2)

The equipment according to claim 2, wherein
the protection circuit includes:
a first detection coil connected between an output of the switching power source and one of the pair of capacitative elements;
a second detection coil magnetically coupled to the first detection coil; and
a comparator circuit that rectifies a voltage inducted in the second detection coil and compares the voltage with a reference voltage.

### Claim 5 (depends on 1)

The equipment according to claim 1, wherein the switching power source is a DC-AC converter that converts the input direct-current power source voltage to an alternating-current voltage.

### Claim 6 (depends on 1)

The equipment according to claim 1, wherein the switching power source is an AC-AC converter that converts the input alternating-current power source voltage to another alternating-current voltage.

### Claim 7 (depends on 1)

The equipment according to claim 1, wherein each of the pair of capacitative elements includes a plurality of series-connected capacitors.

### Claim 8 (depends on 1)

The equipment according to claim 1, wherein
the switching power source includes:
a resonance coil;
a resonance capacitor that is parallel-connected to the resonance coil to form a resonance circuit;
a switching element connected to the resonance coil and the resonance capacitor; and
a current control element that is series-connected to the switching element and turns off the switching element when a current of the switching element exceeds a predetermined upper limit, and
the protection circuit turns off the current control element and stops an operation of the switching power source.