发明名称 |
POWER-FACTOR CORRECTION CIRCUIT |
摘要 |
The present invention includes: a series circuit including a reactor and a switching element connected between the rectified-current output terminals of a rectifier; a series circuit including a diode and a smoothing capacitor for obtaining an output voltage, connected in parallel to the switching element; an error amplifier configured to detect the output voltage, amplify the error between the detected output voltage and a reference voltage, and output an error signal; a zero-current detector configured to output a signal when detecting that a reactor current flowing in the reactor has become zero current; a correction signal circuit configured to detect a switching current flowing in the switching element, and generate a correction signal corresponding to the detected switching current; and an ON-period control circuit configured to control the switching element's ON period in accordance with the error signal and correction signal, from when the zero-current detector detects the zero current. |
申请公布号 |
US2015023067(A1) |
申请公布日期 |
2015.01.22 |
申请号 |
US201414333972 |
申请日期 |
2014.07.17 |
申请人 |
Sanken Electric Co., Ltd. |
发明人 |
TERASAWA Yoichi |
分类号 |
H02M1/42;H02M3/335 |
主分类号 |
H02M1/42 |
代理机构 |
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代理人 |
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主权项 |
1. A power-factor correction circuit, comprising:
a rectifier configured to rectify an input AC voltage; a first series circuit including a reactor and a switching element which are connected between rectified-current output terminals of the rectifier; a second series circuit including a diode and a smoothing capacitor for obtaining an output voltage, the diode and the smoothing capacitor being connected in parallel to the switching element; an error amplifier configured to detect the output voltage, amplify an error between the detected output voltage and a reference voltage, and output an error signal; a zero-current detector configured to output a signal when detecting that a reactor current flowing in the reactor has become zero current; a correction signal circuit configured to detect a switching current flowing in the switching element, and generate a correction signal corresponding to the detected switching current; and an ON-period control circuit configured to control an ON period of the switching element in accordance with the error signal and the correction signal, the control starting from when the zero-current detector detects the zero current. |
地址 |
Niiza-shi JP |