Title:
EMERGENCY OUTPUT CIRCUIT USED FOR STARTING LED LAMP TUBE HAVING LEAKAGE PROTECTION
Document Type and Number:
WIPO Patent Application WO/2023/004739
Kind Code:
A1
Abstract:
Provided is an emergency output circuit used for starting an LED lamp tube having leakage protection, comprising: a charging circuit; and, provided with a PWM pulse generator, a push-pull boost circuit and a full bridge inverter circuit; the charging circuit is connected to the PWM pulse generator, the PWM pulse generator comprises a PWM chip, and when a control terminal detects a power outage state, a high electrical level is immediately outputted to the PWM chip, and the PWM pulse generator is used for outputting a complementary drive PWM rectangular wave with an adjustable dead time; following boosting, rectification and filtering are performed to form a 250V DC voltage, then the full bridge inverter circuit is used to form an alternating square wave on the LED lamp tube; complementary PWM control is used, alternating the turning-on of two pairs of MOS transistors, producing an AC voltage UAB on the LED lamp tube; and finally, a correction circuit is used to obtain an AC rectangular wave slowly changed from a 250V DC output to a stable AC 135V output, thus effectively reducing cost and simplifying the circuit.
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Inventors:
KE JIANJUN (CN)
Application Number:
PCT/CN2021/109565
Publication Date:
February 02, 2023
Filing Date:
July 30, 2021
Export Citation:
Assignee:
SHENZHEN BILLDA TECH CO LTD (CN)
International Classes:
H02J9/00
Foreign References:
| CN207677500U | 2018-07-31 | |||
| CN208971208U | 2019-06-11 | |||
| US20170201170A1 | 2017-07-13 |
Attorney, Agent or Firm:
SHENZHEN SEMHOPE GUANGLIANINTELLECTUAL PROPERTY AGENCY (CN)
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