Led drive circuit, led illumination component, led illumination device, and led illumination system

An LED illumination component, comprising:

• an LED drive circuit that is connectable to a phase-control light controller and drives an LED load by use of a voltage obtained by rectifying a phase-controlled alternating current voltage inputted from the phase-control light controller, the LED drive circuit including:
• a first phase angle detection portion that detects a phase angle in a present cycle;
• a second phase angle detection portion that detects a phase angle in a cycle preceding the present cycle by at least one cycle;
• a bias portion that generates a detection signal by adding a predetermined delay time to a phase angle obtained by averaging the phase angle detected by the first phase angle detection portion and the phase angle detected by the second phase angle detection portion;
• and
• a drive portion that starts current supply to the LED load at timing based on the detection signal generated by the bias portion;
• and
• the LED load that is connected to an output side of the LED drive circuit.

An LED illumination device, comprising:

• an LED drive circuit that is connectable to a phase-control light controller and drives an LED load by use of a voltage obtained by rectifying a phase-controlled alternating current voltage inputted from the phase-control light controller, the LED drive circuit including:
• a first phase angle detection portion that detects a phase angle in a present cycle;
• a second phase angle detection portion that detects a phase angle in a cycle preceding the present cycle by at least one cycle;
• a bias portion that generates a detection signal by adding a predetermined delay time to a phase angle obtained by averaging the phase angle detected by the first phase angle detection portion and the phase angle detected by the second phase angle detection portion;
• and
• a drive portion that starts current supply to the LED load at timing based on the detection signal generated by the bias portion.

An LED illumination device, comprising:

• an LED illumination component including:
• an LED drive circuit that is connectable to a phase-control light controller and drives an LED load by use of a voltage obtained by rectifying a phase-controlled alternating current voltage inputted from the phase-control light controller, the LED drive circuit including:
• a first phase angle detection portion that detects a phase angle in a present cycle;
• a second phase angle detection portion that detects a phase angle in a cycle preceding the present cycle by at least one cycle;
• a bias portion that generates a detection signal by adding a predetermined delay time to a phase angle obtained by averaging the phase angle detected by the first phase angle detection portion and the phase angle detected by the second phase angle detection portion;
• and
• a drive portion that starts current supply to the LED load at timing based on the detection signal generated by the bias portion;
• and
• the LED load that is connected to an output side of the LED drive circuit.

An LED illumination system, comprising:

• an LED illumination component including:
• an LED drive circuit that is connectable to a phase-control light controller and drives an LED load by use of a voltage obtained by rectifying a phase-controlled alternating current voltage inputted from the phase-control light controller, the LED drive circuit including:
• a first phase angle detection portion that detects a phase angle in a present cycle;
• a second phase angle detection portion that detects a phase angle in a cycle preceding the present cycle by at least one cycle;
• a bias portion that generates a detection signal by adding a predetermined delay time to a phase angle obtained by averaging the phase angle detected by the first phase angle detection portion and the phase angle detected by the second phase angle detection portion;
• and
• a drive portion that starts current supply to the LED load at timing based on the detection signal generated by the bias portion;
• and
• the LED load that is connected to an output side of the LED drive circuit;
• and
• the phase-control light controller that is connected to an input side of the LED illumination component.

An LED illumination system, comprising:

• an LED illumination device including:
• an LED drive circuit that is connectable to a phase-control light controller and drives an LED load by use of a voltage obtained by rectifying a phase-controlled alternating current voltage inputted from the phase-control light controller, the LED drive circuit including:
• a first phase angle detection portion that detects a phase angle in a present cycle;
• a second phase angle detection portion that detects a phase angle in a cycle preceding the present cycle by at least one cycle;
• a bias portion that generates a detection signal by adding a predetermined delay time to a phase angle obtained by averaging the phase angle detected by the first phase angle detection portion and the phase angle detected by the second phase angle detection portion;
• and
• a drive portion that starts current supply to the LED load at timing based on the detection signal generated by the bias portion;
• and
• the phase-control light controller that is connected to an input side of the LED illumination device.

An LED illumination system, comprising:

• an LED illumination device including:
• an LED illumination component including:
• an LED drive circuit that is connectable to a phase-control light controller and drives an LED load by use of a voltage obtained by rectifying a phase-controlled alternating current voltage inputted from the phase-control light controller, the LED drive circuit including:
• a first phase angle detection portion that detects a phase angle in a present cycle;
• a second phase angle detection portion that detects a phase angle in a cycle preceding the present cycle by at least one cycle;
• a bias portion that generates a detection signal by adding a predetermined delay time to a phase angle obtained by averaging the phase angle detected by the first phase angle detection portion and the phase angle detected by the second phase angle detection portion;
• and
• a drive portion that starts current supply to the LED load at timing based on the detection signal generated by the bias portion;
• and
• the LED load that is connected to an output side of the LED drive circuit;
• and
• the phase-control light controller that is connected to an input side of the LED illumination device.