发明名称 |
CONTROL CIRCUIT FOR POWER CONVERTER AND METHOD THEREOF |
摘要 |
A control circuit for a power converter includes a pulse width modulation signal generating circuit, a power estimation circuit, and a current limiting signal generating circuit. The pulse width modulation signal generating circuit generates pulse width modulation signals according to a current sense signal and a current limiting signal for configuring the conduction status of a switch circuit of the power converter. The power estimation circuit generates a power estimation signal for estimating the power which the power converter provides to a load. The current limiting signal generating circuit generates the current limiting signal according to the power estimation signal so that the power converter may provide suitable power to the load. |
申请公布号 |
US2014328099(A1) |
申请公布日期 |
2014.11.06 |
申请号 |
US201414266865 |
申请日期 |
2014.05.01 |
申请人 |
Richtek Technology Corporation |
发明人 |
LIN Hung-Lin |
分类号 |
H02M7/5395 |
主分类号 |
H02M7/5395 |
代理机构 |
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代理人 |
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主权项 |
1. A control circuit for a power converter, for configuring a conduction status of a switch circuit of the power converter for providing power to a load, comprising:
a current limiting signal generating circuit, configured to operably generate a current limiting signal; a pulse width modulation (PWM) signal generating circuit, configured to operably generate a PWM signal according to a current sense signal and the current limiting signal for configuring the conduction status of the switch circuit; and a power estimation circuit, configured to operably generate a power estimation signal according to the PWM signal, the current sense signal and the current limiting signal; wherein the current limiting signal generating circuit compares the power estimation signal with a predetermined power signal for generating the current limiting signal; the power estimation circuit generates the power estimation signal according to the current sense signal at a third time point and according to a difference between the current sense signal at a fourth time point and the current sense signal at a second time point; the second time point is configured to be a time point at which the PWM signal maintains active to a predetermined proportion of the time the PWM signal maintains active; the third time point is later than the second time point with a predetermined delay time; and the fourth time point is a time point at which the PWM signal tunas from active to inactive. |
地址 |
Chupei City TW |