Circuit configuration having a resonant converter, and method for operating a resonant converter
First Claim
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1. A circuit configuration, comprising:
- a primary winding of a transformer;
a resonant converter feeding energy into said primary winding of said transformer;
a control circuit for controlling said resonant converter and having a plurality of modules, said plurality of modules including;
a frequency generator controllable with a variable frequency;
a short circuit monitoring unit for protecting components of said resonant converter; and
an open circuit detection unit, said open circuit detection unit shutting down said resonant converter if a secondary side interacting with said primary winding of said transformer is open circuit, without feedback from the secondary side, said open circuit detection unit having a cascaded sample-and-hold circuit, said open circuit detection unit having a comparator and a flip-flop connected downstream of said cascaded sample-and-hold circuit;
a controller having an input and provided for controlling said resonant converter, said cascaded sample-and-hold circuit having an output side connected to said input of said controller; and
a gate driver having an input and provided for injecting power into said primary winding of said transformer, said flip-flop having an output directly connected to said input of said gate driver;
said cascaded sample-and-hold circuit having an output providing an analog input signal to an input of said control circuit for controlling said resonant converter, said analog input signal representing a measured value for a relationship between open circuit operation and operation under load; and
said gate driver being a component of said resonant converter.
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Abstract
A circuit configuration contains a resonant converter feeding energy into a primary winding of a transformer, a control circuit for controlling the resonant converter and a plurality of modules. The modules include a frequency generator controllable with variable frequency, a short circuit monitoring unit configured to protect components of the resonant converter, and an open circuit detection unit. The open circuit detection unit is configured to shut down the resonant converter if a secondary side interacting with the primary winding of the transformer is open circuit, without having information from the secondary side.
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Citations
16 Claims
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1. A circuit configuration, comprising:
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a primary winding of a transformer; a resonant converter feeding energy into said primary winding of said transformer; a control circuit for controlling said resonant converter and having a plurality of modules, said plurality of modules including; a frequency generator controllable with a variable frequency; a short circuit monitoring unit for protecting components of said resonant converter; and an open circuit detection unit, said open circuit detection unit shutting down said resonant converter if a secondary side interacting with said primary winding of said transformer is open circuit, without feedback from the secondary side, said open circuit detection unit having a cascaded sample-and-hold circuit, said open circuit detection unit having a comparator and a flip-flop connected downstream of said cascaded sample-and-hold circuit; a controller having an input and provided for controlling said resonant converter, said cascaded sample-and-hold circuit having an output side connected to said input of said controller; and a gate driver having an input and provided for injecting power into said primary winding of said transformer, said flip-flop having an output directly connected to said input of said gate driver; said cascaded sample-and-hold circuit having an output providing an analog input signal to an input of said control circuit for controlling said resonant converter, said analog input signal representing a measured value for a relationship between open circuit operation and operation under load; and said gate driver being a component of said resonant converter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An operational method, which comprises the steps of:
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providing a circuit configuration containing a primary winding of a transformer, a resonant converter feeding energy into the primary winding of the transformer, and a control circuit for controlling the resonant converter and having a plurality of modules, the plurality of modules including a frequency generator controllable with a variable frequency, a short circuit monitoring unit for protecting components of the resonant converter, and an open circuit detection unit, the open circuit detection unit shutting down the resonant converter if a secondary side interacting with the primary winding of the transformer is open circuit, without feedback from the secondary side; and using the circuit configuration in a wireless battery charging system of an electric vehicle; wherein the open circuit detection unit detects an open circuit by; acquiring a plurality of current measurements during each complete period of a primary current signal, and generating a signal from the current measurements which is maintained stable at least for a sub-period of a complete period until acquisition of a next current measurement. - View Dependent Claims (9)
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10. A method for operating a resonant converter which feeds energy into a primary winding of a transformer, which comprises the steps of:
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operating the resonant converter in an above-resonance region; controlling the resonant converter by means of a controller; and monitoring a secondary-side open circuit condition of the transformer on the primary side asynchronously with respect to the controller, wherein controller-independent shutdown of the resonant converter takes place if an open circuit condition is detected; wherein for the open circuit condition is detected by; acquiring a plurality of current measurements during each complete period of a primary current signal; and generating a signal from the current measurements which is maintained stable at least for a sub-period of a complete period until acquisition of a next current measurement. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification