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US 6,477,069 B1Granted
Circuit for detecting and inadmissibly high current in an output stage
AssigneeRobert Bosch GmbH
InventorRobert Kern
Life of this patent
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Abstract
A circuit for detecting an impermissibly high current in an output stage contains two transistors arranged in a bridge branch of a bridge circuit. A comparator compares the voltage obtained at the connection point of the two transistors with the voltage obtained at the center tap of a voltage divider connected to the power supply terminals. A switching transistor changes the voltage divider ratio of the voltage divider as a function of the switching signal of one of the transistors.
Claims4
A circuit for detecting an impermissibly high current in an output stage, comprising:
- a series circuit of a first semiconductor component and a second semiconductor component, the series circuit being coupled between first and second power supply terminals;
- a voltage divider coupled between the first and second power supply terminals, the voltage divider having a center tap;
- a comparator for comparing a voltage drop across one of the first and second semiconductor components with a predefined threshold value, the comparator having a first input and a second input, the first input being coupled to a connection point of the first and second semiconductor components, the second input being coupled to the center tap of the voltage divider;
- and
- a change-over switching element for changing a ratio of the voltage divider, the change-over switching element being controlled by a switching signal of one of the first and second semiconductor components.
2 more elements
Dependencies are inferred from the claim text.