Lamp having fixed phase power controller with analog trigger
View Patent ↗A lamp which includes a fixed phase power controller connected between a terminal and a light emitting element converts line voltage to an RMS load voltage. The controller has an analog control block that receives an input that is independent of a change in magnitude of the line voltage and that charges and discharges to provide a trigger signal at a first frequency, a reset circuit that periodically resets an initial condition of said analog control block, a synchronization connection that provides a sync signal that synchronizes the trigger signal with a waveform of the line voltage, and a control circuit that is connected to said terminal and to said analog control block and that clips a load voltage based on the synchronized trigger signal to define the RMS load voltage.
1. A lamp comprising:
a terminal for a line voltage;
a light emitting element; and
a fixed phase power controller connected between said terminal and said light emitting element and that converts the line voltage to an RMS load voltage,
said controller having an analog control block that receives an input that is independent of a change in magnitude of the line voltage and that charges and discharges to provide a trigger signal at a frequency, a reset circuit that periodically resets an initial condition of said analog control block, a synchronization connection that provides a sync signal that synchronizes the trigger signal with a waveform of the line voltage, and a control circuit including a switch, the control circuit is connected to said terminal and to said analog control block and that clips a load voltage based on the synchronized trigger signal to define the RMS load voltage.
2. The lamp of claim 1 , further comprising a DC source that provides said input to said analog control block and wherein said analog control block comprises a capacitor that receives a DC signal from said DC source and charges and discharges to provide the trigger signal at the frequency.
3. The lamp of claim 1 , wherein said synchronization connection connects said analog control block to said control circuit and provides the sync signal from said control circuit to said analog control block.
4. The lamp of claim 1 , wherein said synchronization connection connects said reset circuit to said control circuit and provides the sync signal from said control circuit to said reset circuit.
5. The lamp of claim 1 , wherein said control circuit comprises at least one of an SCR, a triac, and a diac.
6. The lamp of claim 1 , wherein said control circuit comprises a full wave bridge.
7. The lamp of claim 1 , further comprising a DC source that provides said input to said analog control block, wherein said analog control block comprises a capacitor that receives a DC signal from said DC source and charges and discharges to provide the trigger signal at the frequency, wherein said synchronization connection connects said capacitor to said control circuit and provides the sync signal from said control circuit to said capacitor, and wherein said control circuit comprises a full wave bridge and at least one of an SCR, a triac, and a diac that is connected to said full wave bridge and to said capacitor.
8. The lamp of claim 1 , wherein said reset circuit comprises a pair of opposing diodes, wherein said synchronization connection connects said pair of opposing diodes to said control circuit and provides the sync signal from said control circuit to said pair of opposing diodes, and wherein said control circuit comprises a full wave bridge and at least one of an SCR, a triac, and a diac that is connected to said full wave bridge and to said opposing diodes.
9. The lamp of claim 1 , further comprising a base to which said light emitting element is attached and a light-transmitting envelope, and wherein said controller is entirely within said base.
10. The lamp of claim 1 , wherein said controller is an integrated circuit.