# US 5,349,268 A · High voltage discharge lamp device

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- Number: US 5,349,268 A
- Document ID: US5349268A
- Status: Granted
- Kind: A
- Application number: 08/132,227
- Filed: 1993-10-06
- Granted: 1994-09-20
- Earliest claimed: 1992-01-27
- Assignees: Mitsubishi Denki Kabushiki Kaisha
- Inventors: Satoshi Nagai; Hiroyasu Kisaichi; Hiroyoshi Yamazaki
- Web page: https://patentgrep.com/patent/US5349268A

## CPC

- H05B 41/2928: {for protecting the lamp against abnormal operating conditions}
- H05B 41/2881: {Load circuits; Control thereof}
- H05B 41/2882: {the control resulting from an action on the static converter}
- H05B 41/2888: {the bridge being commutated at low frequency, e.g. 1kHz}
- H05B 41/382: {during the transitional start-up phase}
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y10S 315/05: Starting and operating circuit for fluorescent lamp
- Y10S 315/07: Starting and control circuits for gas discharge lamp using transistors
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A high voltage discharge lamp device may include a step-up DC-DC converter connected to a power switch; polarity switching elements for alternatively changing the polarities of the electric voltage outputted from the step-up DC-DC converter; and a polarity switching drive circuit for activating the polarity switching elements. Also, a high voltage discharge lamp device may include a pair of first and second step-up DC-DC converters connected to a power switch; polarity switching elements for alternatively changing the output polarities of the respective first step-up DC-DC converter and the second step-up DC-DC converter; and a polarity switching drive circuit for activating the polarity switching elements. The polarity switching drive circuit operates in synchronization with the on/off actions of the power switch, or in synchronization with either ultra low-frequency signals or low-frequency signals.

## Claims

### Claim 1

A device for a high voltage discharge lamp comprising:
first and second step-up DC-DC converters connected to a power switch for supplying a first electric voltage and a second electric voltage, respectively;
relay contact switch means for alternatively switching between said first electric voltage and said second electric voltage, said first electric voltage having a polarity opposite to said second electric voltage; and
control means for changing a switched state of said relay contact switch means independent of said power switch being turned on and off.

### Claim 2 (depends on 1)

The device of claim 1, further including a built-in oscillating circuit, wherein said control means operates in synchronization with signals generated from said built-in oscillating circuit.

### Claim 3 (depends on 2)

The device of claim 2, wherein said signals include ultra-low frequency signals.

### Claim 4 (depends on 2)

The device of claim 2, wherein said signals include low-frequency signals.

### Claim 5 (depends on 3)

The device of claim 3, wherein said ultra-low frequency signals have a period on the order of ten minutes.

### Claim 6

A device comprising:
first and second step-up DC-DC converters connected to a power switch for supplying a first electric voltage and a second electric voltage, respectively;
polarity switching means comprising a pair of switching means for alternatively switching between said first electric voltage and said second electric voltage, said first electric voltage having a polarity opposite to said second electric voltage; and
a control circuit for changing a switched state of said pair of polarity switching means, wherein said pair of switching means operates in synchronization with ultra-low frequency signals generated by said control circuit.

### Claim 7 (depends on 6)

The device of claim 6, wherein said pair of switching means are transistors.

### Claim 8

A device comprising:
first and second step-up DC-DC converters connected to a power switch for supplying a first electric voltage and a second electric voltage, respectively, said first electric voltage having a polarity opposite to said second electric voltage;
a first transistor and a second transistor, connected to said first step-up DC-DC converter and said second step-up DC-DC converter respectively, wherein said first transistor and said second transistor alternatively switch between a first switched state in which said first transistor is on and said second transistor is off and said second electric voltage is supplied to a lamp, and a second switched state in which said first transistor is off and said second transistor is on and said first electric voltage is supplied to said lamp; and
a control circuit for changing between said first switched state and said second switched state.