| 发明名称 | LED lighting device | ||
| 摘要 | The LED lighting device of the present invention includes: a power supply circuit connected between a light source including a light emitting diode and a power source and including a series circuit of a switching device and an inductor; an inductor current detector configured to provide a measurement value indicative of an inductor current flowing through the inductor; a drive circuit configured to turn on the switching device at a predetermined period and turn off the switching device when the measurement value is equal to a first threshold or more; a load current detector configured to measure a load current flowing through the light source; and a protection device configured to, when the load current measured is equal to a second threshold or more, perform a protection operation of changing, to reduce the load current, a circuit constant of a power supply path in which the load current flows. | ||
| 申请公布号 | US9018860(B2) | 申请公布日期 | 2015.04.28 |
| 申请号 | US201314021003 | 申请日期 | 2013.09.09 |
| 申请人 | Panasonic Intellectual Property Management Co., Ltd. | 发明人 | Kado Yoshikazu |
| 分类号 | G05F1/00;H05B37/02;H05B39/04;H05B41/36;H05B37/00;H05B39/00;H05B41/00;H05B33/08;H02M3/158;H02M1/00 | 主分类号 | G05F1/00 |
| 代理机构 | Renner, Otto, Boisselle & Sklar, LLP | 代理人 | Renner, Otto, Boisselle & Sklar, LLP |
| 主权项 | 1. An LED lighting device comprising: a power supply circuit which is connected between a light source including a light emitting diode and a power source and includes a series circuit of a switching device and an inductor; an inductor current detector configured to measure an inductor current flowing through the inductor and provide a measurement value indicative of the inductor current; a drive circuit configured to allow the power supply circuit to provide a predetermined DC current to the light source by turning on the switching device at a predetermined period and turning off the switching device when the measurement value from the inductor current detector is equal to a first threshold or more; a load current detector configured to measure a load current flowing through the light source; and a protection device configured to, when the load current measured by the load current detector is equal to a second threshold or more, perform a protection operation of changing, to reduce the load current, a circuit constant of a power supply path in which the load current flows, wherein the protection device is configured to, in the protection operation, change the circuit constant to shorten a turned-on period of the switching device. | ||
| 地址 | Osaka JP | ||