Title:
NEGATIVE CHARGE PUMP DOUBLING OUTPUT VOLTAGE RANGE FOR STEP-UP LED DRIVER
Document Type and Number:
Japanese Patent JP2019193559
Kind Code:
A
Abstract:
To provide a power supply circuit with a negative power supply circuit doubling an output voltage range for a step-up LED driver.SOLUTION: A power supply circuit 100 comprises a regulated positive power supply circuit 102 and an unregulated negative power supply circuit 104. The regulated positive power supply circuit 102 includes an inductor 106 arranged to receive input energy from an input circuit node, a switch circuit 108 coupled to the inductor 106 at a switch circuit node, and a control circuit 110 coupled to the switch circuit 108. The control circuit 110 is configured to control activation of the switch circuit 108 to regulate voltage at a regulated circuit node and generate a positive output voltage at a positive output circuit node. The unregulated negative power supply circuit 104 is operatively coupled to the switch circuit node of the switch circuit 108 and is configured to generate a negative power supply voltage at a negative output circuit node.SELECTED DRAWING: Figure 1
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Inventors:
KE XUGANG
XU YAOJIE
ZHENG MING
KEITH SZOLUSHA
XU YAOJIE
ZHENG MING
KEITH SZOLUSHA
Application Number:
JP2019077661A
Publication Date:
October 31, 2019
Filing Date:
April 16, 2019
Export Citation:
Assignee:
LINEAR TECH HOLDING LLC
International Classes:
H02M3/155; H05B44/00
Domestic Patent References:
| JP2007318879A | 2007-12-06 | |||
| JP2012231657A | 2012-11-22 | |||
| JPH0678537A | 1994-03-18 |
Attorney, Agent or Firm:
Hidesaku Yamamoto
Natsuki Morishita
Takatoshi Iida
Daisuke Ishikawa
Kensaku Yamamoto
Natsuki Morishita
Takatoshi Iida
Daisuke Ishikawa
Kensaku Yamamoto