| CPC H02J 50/12 (2016.02) [A47J 43/0465 (2013.01); H02J 50/10 (2016.02); H02P 13/00 (2013.01)] | 16 Claims |
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1. Method for controlling an induction coil to adjust a power generation for a primary power on said induction coil, wherein:
said induction coil is designed for power transmission to an electrical consumer put onto a cover above said induction coil, said electrical consumer having a receiver coil and an electrical load connected to said receiver coil,
control means for said power generation are provided,
said induction coil forms a primary-side resonant circuit with a capacitance connected in series,
said induction coil and said receiver coil are coupled in a style of a transformer such that a current in said induction coil induces a voltage in said receiver coil that causes a flow of current and hence a generation of a secondary power in said load of said electrical consumer,
information pertaining to a desired secondary power on said load of said electrical consumer is prescribed for said control means of said induction coil,
said control means of said induction coil have at least two manipulated variables by means of which they alter said generated primary power, namely an altering of an operating frequency for said primary-side resonant circuit as a first manipulated variable and an altering of a voltage effectively applied to said primary-side resonant circuit as a second manipulated variable, the second manipulated variable being different than the first manipulated variable,
said control means of said induction coil operate with a transfer function P(f) that has at least one local peak and that, at least locally, is such that decreasing said operating frequency leads to said primary power being higher and increasing said operating frequency leads to said primary power being lower,
wherein
said control means in a first mode of operation always attempt to adjust a desired secondary power to a steady state using a maximum modulation of said voltage effectively applied to said primary-side resonant circuit, as the second manipulated variable, in the following cases:
in an event of a change in said desired secondary power or
in an event of a difference between a measured secondary power and said desired secondary power caused by a change in said transformer-style coupling between said induction coil and said receiver coil and/or by a change in said electrical load brought about by integrated switching means in said electrical consumer,
said primary power is increased by virtue of said control means decreasing said operating frequency as said first manipulated variable,
said primary power is decreased by virtue of two distinct steps, wherein said voltage effectively applied to said primary-side resonant circuit, as said second manipulated variable, is decreased in a first of the two distinct steps and said operating frequency as said first manipulated variable is increased in a second of the two distinct steps, the second step being subsequent to the first step.
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