Electronic circuit and method for determining an impedance

摘要

An electronic circuit is arranged in an external programming device and is used for contactless programming of a circuit to be programmed. The electronic circuit has a series resonant circuit that includes a transmitter coil and a capacitor. The transmitter coil of the series resonant circuit is used for inductive coupling to a receiver coil in the circuit to be programmed. For the purpose of evaluating the impedance that actually exists in the circuit to be programmed, there is provided a device for determining the value of the impedance from a phase difference between the control voltage of the series resonant circuit and the capacitor voltage of the series resonant circuit.

主权项

1. An electronic circuit in an external programming device and configured for contactless programming of a circuit to be programmed, the electronic circuit comprising:
a series resonant circuit including a transmitter coil and a capacitor connected in series; said transmitter coil of the series resonant circuit being disposed for inductive coupling to a receiver coil of the circuit to be programmed; and a device connected to said series resonant circuit and configured for determining, from a phase difference between a control voltage of said series resonant circuit and a capacitor voltage of said series resonant circuit, an actual impedance existing in the circuit to be programmed.