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US 2002/0159276 A1Published application
Semiconductor circuit and switch-mode power supply
AssigneeInfineon Technologies AG
InventorsGerald Deboy, Gerald Mundel, Harald Zollinger
Life of this patent
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Abstract
The invention relates to a semiconductor circuit having a drive circuit, a load that is disposed between a supply voltage, and a controllable, clocked semiconductor switching element for clocked switching of the load. The invention furthermore relates to a switch-mode power supply having such a semiconductor circuit.
Claims27
A semiconductor circuit, comprising:
- a drive circuit having a drive circuit output and producing a control signal at said drive circuit output;
- a controllable, integrated semiconductor switching element configured to switch itself on and off;
- a load-break switch for clocked switching of a load, said load-break switch having:
- first and second load path connections;
- a control connection connected to said drive circuit output;
- and
- said control signal controlling said load-break switch through said control connection;
- a first current source having a first output and providing a starting charging current at said first output when said load-break switch is switched off, said first current source connected to said first load path connection;
- a monitoring device having at least one second current source with a second output;
- said at least one second current source producing a status signal at said second output;
- said monitoring device at least one of:
- measuring a voltage between said first and second load path connections;
- and
- measuring a potential present at one of said first and second load path connections;
- said monitoring device producing said status signal dependent upon at least one of said voltage and said potential;
- and
- a starting charging device connected to said drive circuit and supplying said drive circuit with power through said starting charging current.
14 more elements
A switch-mode power supply, comprising:
- a load;
- a semiconductor circuit having:
- a drive circuit having a control signal input and a drive circuit output and producing a control signal at said drive circuit output;
- a controllable, integrated semiconductor switching element configured to switch itself on and off;
- a load-break switch for clocked switching of said load, said load-break switch having:
- first and second load path connections;
- a control connection connected to said drive circuit output;
- and
- said control signal controlling said load-break switch through said control connection;
- a first current source having a first output and providing a starting charging current at said first output when said load-break switch is switched off, said first current source connected to said first load path connection;
- a monitoring device having at least one second current source with a second output;
- said at least one second current source producing a status signal at said second output;
- said monitoring device at least one of:
- measuring a voltage between said first and second load path connections;
- and
- measuring a potential present at one of said first and second load path connections;
- said monitoring device producing said status signal dependent upon at least one of said voltage and said potential;
- and
- a starting charging device connected to said drive circuit and supplying said drive circuit with power through said starting charging current;
- a transformer having:
- a primary winding;
- and
- a secondary winding with a secondary output;
- said semiconductor switching element configured to apply a substantially rectified voltage in a clocked manner to said primary winding;
- said secondary winding supplying power from said primary winding at said secondary output to said load;
- a feedback device connected to said control signal input;
- and
- said feedback device supplying one of a voltage produced at said secondary output and a current at said secondary output to said control signal input.
25 more elements
Dependencies are inferred from the claim text.