Operation of a half-bridge, in particular a field-effect transistor half-bridge
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Accused Products
Abstract
The invention relates to a circuit configuration (1) for controlling the operation of a half-bridge (13) by pulse-width modulation, especially in a synchronous rectifier mode. Said circuit configuration comprises a first terminal connection (23, 25) for electrically connecting the circuit configuration (1) to an insulated gate terminal of a bridge valve (15, 17) of the half-bridge (13), a second terminal connection (20, 22) for electrically connecting the circuit configuration (1) to an additional terminal of the bridge valve (15, 17), a lead (16, 18) electrically connecting the first terminal connection (23, 25) to the second terminal connection (20, 22), and an electric valve (43, 45) that can be switched on and off by pulse-width modulated signals. Said electric valve (43, 45) is disposed in the lead (16, 18) so that a flow of current through the lead (16, 18) can be released and blocked. The invention is specifically characterized in that at least one inductive component (35, 37) is provided in the lead (16, 18) so that a time course of an electric current flow in the lead (16, 18) is influenced by the inductance of the inductive component (35, 37), in addition to the influence of a possibly present parasitic inductance.
54 Citations
26 Claims
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1-10. -10. (canceled)
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11. A circuit configuration (1;
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91) for controlling an operation of a half-bridge (13) by way of pulse-width modulation, the half-bridge (13) having a bridge valve (15, 17) with an insulated gate terminal and a further terminal, the circuit configuration comprising;
a first terminal connection (23, 25) for electrically connecting the circuit configuration (1;
91) to the insulated gate terminal of the bridge valve (15, 17) of the half-bridge (13);
a second terminal connection (20, 22) for electrically connecting the circuit configuration (1;
91) to the further terminal of the bridge valve (15, 17);
an electrical lead (16, 18) electrically connecting said first terminal connection (23, 25) and said second terminal connection (20, 22) to one another;
an electrical valve (43, 45) configured to be selectively switched on and switched off by way of pulse-width modulated signals, said electrical valve (43, 45) being connected in said electrical lead (16, 18) enabling or blocking current flow through said electrical lead (16, 18);
at least one inductive component (35, 37) connected in said electrical lead (16, 18), for influencing a time progression of an electric current flow in said electrical lead (16, 18) by an inductance of said inductive component (35, 37) in addition to an influence of a possibly present parasitic inductance; and
a resistance device (83, 85) connected in said electrical lead (16, 18) in series with said at least one inductive component (35, 37). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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91) for controlling an operation of a half-bridge (13) by way of pulse-width modulation, the half-bridge (13) having a bridge valve (15, 17) with an insulated gate terminal and a further terminal, the circuit configuration comprising;
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24. A method for controlling an operation of a half-bridge (13) by way of pulse-width modulation, the method which comprises:
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providing a half-bridge (13) with a bridge valve (15, 17) having an insulated gate terminal and a further terminal;
when the bridge valve (15, 17) is switched off, conducting an electric current flow between the insulated gate terminal and the further terminal or a component electrically connected to the further terminal through an inductive component (35, 37), to thereby influence a time progression of the electrical current flow with an inductance of the inductive component (35, 37) in addition to an influence of any parasitic inductance that may be present; and
conducting the electric current flow through a resistance (83,85) connected in series with the at least one inductive component (35,37). - View Dependent Claims (25, 26)
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Specification