| 摘要 |
<p>The circuit permits the driving (1) of a load (3) having a first terminal (3a) connected to a terminal of a direct-current voltage source (2), the other terminal of which is connected to a first earth conductor or power earth conductor (PGND).</p><p><Paragraphs id="pa02" num="0002" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">The driving circuit (1) comprises:
a power driver circuit (PD) with at least one electronic device with controlled conduction (Q, Q1), in particular, a MOSFET transistor (Q, Q1), connected between the other or second terminal (3b) of the load (3) and the power earth conductor (PGND), and
a control and diagnosis circuit (IC, CDC) connected to the power driver circuit (PD) and arranged to drive the at least one electronic device with controlled conduction (Q, Q1) in accordance with predetermined procedures in dependence on an input control signal (INS) and to supply to a diagnosis terminal or output (DOUT) diagnostic signals indicative of any malfunctions or failures which have occurred in the power driver circuit (PD).</p><p><Paragraphs id="pa03" num="0003" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">The control and diagnosis circuit (IC; CDC) is connected to a second earth conductor or signal earth conductor (SGND) which is physically and electrically distinct from the first earth conductor (PGND).</p><p><Paragraphs id="pa04" num="0004" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">The driving circuit (1) further comprises:
a connection, detection, and control circuit (PGDD) which is connected to the earth conductors (PGND, SGND) and is suitable for generating a direct-current voltage corresponding to the potential difference between the earth conductors (PGND, SGND) and for supplying to the control and diagnosis circuit means (IC, CDC) a signal suitable for forcing a voltage of predetermined value at the diagnosis terminal or output (DOUT) when that potential difference exceeds a predetermined value.</p> |
