Off-state load open circuit detection circuit

Abstract

The invention discloses an off-state load open circuit detection circuit, which comprises a switch module, a load on-off judgment module and a control module, and is characterized in that the switch module is connected to a to-be-detected load circuit and provides current for the to-be-detected load circuit; the load on-off judgment module is connected to the load circuit to be tested and is usedfor receiving load voltage from the load circuit to be tested and generating a voltage judgment signal according to the load voltage; the control module is connected to the load on-off judgment moduleand the switch module, and is used for judging whether the to-be-tested load circuit is disconnected or not according to the voltage judgment signal, and controlling the switch module to be in an offstate continuously when the to-be-tested load circuit is disconnected. The off-state load open circuit detection circuit can identify whether the load circuit is disconnected or not under the condition that the power tube is disconnected, and controls the power tube to be disconnected when the load circuit is disconnected, so as to prevent a chip circuit from being damaged.

Description

technical field [0001] The invention belongs to the technical field of detection circuits, and in particular relates to an off-state load disconnection detection circuit. Background technique [0002] The high-side power driver chip is used to provide output current for the ground load, the internal logic circuit of the chip controls the opening of the power tube, and the internal power tube of the chip provides current for the ground load. In order to understand the working state of the load circuit, it is necessary to detect whether there is an open circuit in the load circuit when the power tube is turned off. When the power tube of the chip is in the off state, and the load is disconnected due to an operation error or other reasons, the error status needs to be reported to the logic control circuit, and the power tube is turned off through the logic control circuit. The circuit that realizes this part of the function is an off-state load disconnection detection circuit....

AI Technical Summary

Problems solved by technology

[0004] However, in the load circuit open state, the load voltage V out close to the larger supply voltage V high , when V high When working in a wide range of voltage, it may cause damage to the post-stage shaping unit, which requires high withstand voltage for the post-stage shaping unit, and the shaping circuit is a high-voltage circuit, which occupies a large layout area

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