| 摘要 |
Disclosed is an LED lamp control circuit. The present invention comprises a rectifier circuit (1), an LED light source load (3), a constant current circuit (4), and a first temperature detect switch circuit (6). The LED light source load (3) comprises at least one group of LEDs, the constant current circuit (4) comprises at least one group of constant current source components, each group of constant current source components is connected in series to the at least one group of LEDs in the LED light source load (3), and the constant current source component comprises a depletion mode field effect transistor that has a drain serving as a contact and has a source and a grid being short-circuited to serve as another contact. The first temperature detect switch circuit (6) is connected to an input end of a power source, and comprises a first normally closed temperature detect switch (F2) mounted on a radiator (102) or at a specific position in the lamp. When the temperature of the radiator (102) or the temperature at the specific position in the lamp exceeds the disconnection temperature of the first normally closed temperature detect switch (F2), the first normally closed temperature detect switch (F2) is disconnected, so as to cut off the power supply of the LED light source load (3). The present invention may be applied to the field of LED lighting. |
