Drive device
First Claim
1. A drive device connected to a solenoid valve, one end portion of a coil of which is connected to a ground that is continuous with a negative electrode side of a battery and which is drivably controlled in accordance with a drive signal input to the other end portion of the coil, the drive device comprising:
- a first current path that has a high-side switching element connected to a positive electrode side of the battery;
a second current path that has a low-side switching element connected to a ground that is continuous with the negative electrode side of the battery;
a third current path connected to the other end portion of the coil and positioned between the first current path and the second current path;
a drive unit that supplies a control signal to each of the high-side switching element and the low-side switching element and that performs control so as to generate the drive signal by alternately switching the first current path and the third current path, and the second current path and the third current path, between a conductive state and a non-conductive state;
an overcurrent detection unit that detects that an overcurrent that exceeds a value of a current that flows during normal supply of the drive signal has flowed through the first current path and the second current path; and
a control unit that executes determination processing in which occurrence of a ground short circuit at a voltage lower than a normal operation range of the solenoid valve is determined in the case where the overcurrent detection unit detects that the overcurrent has flowed through the first current path, and in which occurrence of a battery short circuit at a voltage higher than the normal operation range of the solenoid valve is determined in the case where the overcurrent detection unit detects that the overcurrent has flowed through the second current path.
1 Assignment
0 Petitions
Accused Products
Abstract
A drive device includes: a first current path that has a high-side MOSFET; a second current path that has a low-side MOSFET; and a third current path connected to the other end portion of a coil and positioned between the first current path and the second current path. The drive device further includes: PWM drive circuits that generate a drive signal through PWM control; and an overcurrent detection circuit that detects that an overcurrent has flowed through the current paths. It is possible to precisely detect the occurrence of a battery short circuit and a ground short circuit by detecting which of the first current path and the second current path an overcurrent has flowed through.
1 Citation
8 Claims
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1. A drive device connected to a solenoid valve, one end portion of a coil of which is connected to a ground that is continuous with a negative electrode side of a battery and which is drivably controlled in accordance with a drive signal input to the other end portion of the coil, the drive device comprising:
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a first current path that has a high-side switching element connected to a positive electrode side of the battery; a second current path that has a low-side switching element connected to a ground that is continuous with the negative electrode side of the battery; a third current path connected to the other end portion of the coil and positioned between the first current path and the second current path; a drive unit that supplies a control signal to each of the high-side switching element and the low-side switching element and that performs control so as to generate the drive signal by alternately switching the first current path and the third current path, and the second current path and the third current path, between a conductive state and a non-conductive state; an overcurrent detection unit that detects that an overcurrent that exceeds a value of a current that flows during normal supply of the drive signal has flowed through the first current path and the second current path; and a control unit that executes determination processing in which occurrence of a ground short circuit at a voltage lower than a normal operation range of the solenoid valve is determined in the case where the overcurrent detection unit detects that the overcurrent has flowed through the first current path, and in which occurrence of a battery short circuit at a voltage higher than the normal operation range of the solenoid valve is determined in the case where the overcurrent detection unit detects that the overcurrent has flowed through the second current path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification