Patent ID: 11864291
Assignee: INVENTRONICS (HANGZHOU), INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An LED control circuit, comprising:
an isolated DC-DC circuit, arranged with a first current loop and a voltage loop and configured to convert an output voltage of a power grid to output a direct current voltage; and
a BUCK circuit, arranged with a control unit, wherein the control unit is configured to control the BUCK circuit to output a constant current to supply power to an LED load, control the BUCK circuit not to operate in a case that the direct current voltage is less than a predetermined voltage, and control the BUCK circuit to start to operate in a case that the direct current voltage is greater than or equal to a predetermined voltage;
wherein the control unit comprises a first detection unit, a second detection unit, and a control IC unit;
the first detection unit is connected in parallel with an output terminal of the isolated DC-DC circuit, and is configured to detect the direct current voltage and feedback the direct current voltage to the control IC unit;
the second detection unit is connected in series with the BUCK circuit, and is configured to detect a target current at an output terminal of the BUCK circuit and feedback the target current to the control IC unit; and
the control IC unit is configured to control the BUCK circuit not to operate by using a switch tube in the BUCK circuit in a case that the direct current voltage is less than the predetermined voltage, control the BUCK circuit to operate by using the switch tube in a case that the direct current voltage is greater than or equal to the predetermined voltage, and control the BUCK circuit to output the constant current based on the target current.