发明名称 |
PWM CIRCUIT AND LED DRIVE CIRCUIT |
摘要 |
A PWM circuit is disclosed in the application, which includes: a PWM counter, a reference value setting register, a frequency multiplier and a comparator, where the frequency multiplier is adapted to increase the frequency of a clock signal input and to output the clock signal with the increased frequency to the PWM counter. An LED drive circuit is further disclosed in the application. The frequency of a PWM input clock signal is increased to N times of the original frequency of the PWM input clock signal by the frequency multiplier, so that the counting cycle of the PWM counter is shortened to 1/N of the original counting cycle of the PWM counter. Therefore, in the dynamic LED display screen, the refresh frequency can be increased to N times of the original refresh frequency while the original resolution is maintained. |
申请公布号 |
US2015163870(A1) |
申请公布日期 |
2015.06.11 |
申请号 |
US201214000508 |
申请日期 |
2012.08.14 |
申请人 |
SUPEC (SUZHOU) CO., LTD. |
发明人 |
Fan Lixin |
分类号 |
H05B33/08;H03K3/017;H05B37/02 |
主分类号 |
H05B33/08 |
代理机构 |
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代理人 |
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主权项 |
1. A PWM circuit, comprising:
a PWM counter, adapted to count a clock signal; a reference value setting register, adapted to set a comparison reference value which determines the duty cycle of a PWM signal; a frequency multiplier, adapted to increase frequency of an clock signal input and to output clock signal with the increased frequency to the PWM counter; and a comparator, adapted to generate a PWM signal based on a comparison between the comparison reference value and the count value of the PWM counter. |
地址 |
Jiangsu CN |