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    • 7. 发明公开
    • LOAD CURRENT/VOLTAGE SENSING FOR ISOLATED POWER CONVERTER
    • EP4369587A1
    • 2024-05-15
    • EP22206008.9
    • 2022-11-08
    • Tridonic GmbH & Co. KG
    • Netzer, Harald
    • H02M3/335H05B45/12H05B45/24
    • H02M3/33553H05B45/24H02M3/33523H05B45/382H05B45/30
    • Disclosed is an isolated power converter (1) for supplying an LED load (3). The converter (1) comprises a first transformer (1101, 1201) for an inductive power transfer from a primary-side circuit (11) to a secondary-side circuit (12); and a second transformer (1102, 1202) for an inductive signal transfer of an oscillation signal (1203, 1103) from the secondary-side circuit (12) to the primary-side circuit (11). The primary-side circuit (11) comprises a switching circuit (1104) for intermittent power input from a direct-current, DC, power source (1105) of the converter (1) in accordance with an actuating variable (1106) of the converter (1); and a control circuit (1107) for providing the actuating variable (1106) of the converter (1) in accordance with an indication (1103', 1103) of a controlled variable (1204) of the converter (1) and an indication (1103") of a reference variable of the converter (1). The secondary-side circuit (12) comprises a voltage-controlled oscillator, VCO (1205), for providing the oscillation signal (1203, 1103) having a frequency in accordance with a magnitude of a voltage (1206, 1206') being indicative of the controlled variable (1204) of the converter (1); and a sensing circuit (1207) for providing the voltage (1206, 1206') being indicative of the controlled variable (1204) of the converter (1). This achieves a secondary-side sensing of an output current (or voltage) at a reasonable price with acceptable accuracy.