Circuit arrangement for monitoring a control circuit
First Claim
1. Circuit arrangement for monitoring a control circuit including a driver transistor which is used to adjust in an inductive load a predetermined average current value by a clocked, pulse-width modulated actuation of the driver transistor, and wherein current flow is initiated by the inductive load in the blocking intervals of the driver transistor through a circuit branch which is parallel to the inductive load and has a switch,wherein a current measuring device is connected parallel to the driver transistor by way of a switching element, and in that in a test period the current through the inductive load is conducted to the current measuring device during blocking intervals.
1 Assignment
0 Petitions
Accused Products
Abstract
A circuit arrangement for monitoring a control circuit, which has a driver transistor with an inductive load and a second transistor in a circuit branch parallel to the inductive load, includes an additional, external current measuring device. A switching element, in particular a transistor and an ohmic measuring resistor, is provided parallel to the driver transistor. At a test instant, the current flowing through the inductive load is diverted to the measuring device and induces a voltage at the measuring resistor which is indicative of the status of the control circuit.
-
Citations
6 Claims
-
1. Circuit arrangement for monitoring a control circuit including a driver transistor which is used to adjust in an inductive load a predetermined average current value by a clocked, pulse-width modulated actuation of the driver transistor, and wherein current flow is initiated by the inductive load in the blocking intervals of the driver transistor through a circuit branch which is parallel to the inductive load and has a switch,
wherein a current measuring device is connected parallel to the driver transistor by way of a switching element, and in that in a test period the current through the inductive load is conducted to the current measuring device during blocking intervals.
Specification