| 摘要 |
An LED lamp control circuit comprises a rectifier circuit, an LED light source load, a constant current circuit, and a first temperature detect switch circuit. The LED light source load comprises at least one group of LEDs. The constant current circuit comprises at least one group of constant current source components, each of which is connected to at least one group of LEDs in the LED light source load and comprises a depletion mode field effect transistor. The first temperature detect switch circuit is connected to an input end of a power source, and comprises a first normally closed temperature detect switch mounted on a radiator. When the temperature of the radiator exceeds the disconnection temperature of the first normally closed temperature detect switch, the first normally closed temperature detect switch is disconnected, so as to cut off the power supply of the LED light source load. |
| 主权项 |
1. An LED lamp and LED lamp control circuit, comprising:
a heat sink that cools an LED light source; a rectifier circuit that changes an alternating current into a direct current; an LED light source load; a constant current circuit that regulates voltage and current for the LED light source load; and a first temperature control switch circuit, wherein the LED light source load comprises at least one group of plural LEDs connected in series, the constant current circuit comprises at least one group of constant current source devices with each group being connected in series to at least one group of the LEDs in the LED light source load and comprises at least one depletion mode field effect transistor of which a drain serves as a contact and a source is short circuited with a grid to serve as the other contact, the first temperature control switch circuit is connected to an input of a power supply and comprises a first normally closed temperature control switch, and the first normally closed temperature control switch is mounted on the heat sink or at a specific position in the lamp and is disconnected when the temperature of the heat sink or the temperature at the specific position in the lamp exceeds the disconnection temperature of the first normally closed temperature control switch, which is a specific temperature between 60 and 100° C., to cut off the power supply to the LED light source load. |
