Electrical leakage detection circuit
First Claim
Patent Images
1. A method for detecting electrical leakage between a power supply and a frame, comprising:
- actuating a transistor switch to connect a first capacitor between the frame and a first terminal of the power supply for a first predetermined period of time;
limiting the current flowing between the frame and the first capacitor to less than a predetermined current limit;
determining if a voltage on the first capacitor exceeds a threshold voltage; and
providing a first output signal when the voltage on the first capacitor exceeds the threshold voltage,wherein the transistor switch is coupled in series between the first capacitor and the frame.
2 Assignments
0 Petitions
Accused Products
Abstract
A method is provided for detecting electrical leakage between a power supply and a frame of a vehicle or machine. The disclosed method includes coupling a first capacitor between a frame and a first terminal of a power supply for a predetermined period of time. The current flowing between the frame and the first capacitor is limited to a predetermined current limit. It is determined whether the voltage across the first capacitor exceeds a threshold voltage. A first output signal is provided when the voltage across the capacitor exceeds the threshold voltage.
-
Citations
19 Claims
-
1. A method for detecting electrical leakage between a power supply and a frame, comprising:
-
actuating a transistor switch to connect a first capacitor between the frame and a first terminal of the power supply for a first predetermined period of time; limiting the current flowing between the frame and the first capacitor to less than a predetermined current limit; determining if a voltage on the first capacitor exceeds a threshold voltage; and providing a first output signal when the voltage on the first capacitor exceeds the threshold voltage, wherein the transistor switch is coupled in series between the first capacitor and the frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. An electrical leakage detection circuit for detecting electrical leakage between a frame and a terminal of a power supply, comprising:
-
a capacitor having a first terminal coupled to a first terminal of the power supply; a current regulator having a first terminal coupled to a second terminal of the first capacitor, wherein the current regulator limits the current flowing through the current regulator to less than a predetermined current limit; a first transistor switch having a first terminal coupled to a second terminal of the current regulator, the first transistor switch having a second terminal coupled to a frame; and a control circuit for periodically turning the first transistor switch to an ON condition for a predetermined period of time, and providing a first output signal when a voltage on the capacitor exceeds a predetermined threshold voltage. - View Dependent Claims (15, 16, 17, 18, 19)
-
Specification