DRIVE CONTROL DEVICE FOR AN ELECTRIC LOAD
First Claim
1. A drive control device for an electric load, comprising:
- a switching element serially connected to an electric load to which a power is supplied from a drive power source; and
monitoring/controlling means for controlling opening/closing of the switching element, and monitoring presence/absence of an abnormal state of a power supply circuit for the electric load, wherein;
the monitoring/controlling means generates a control output signal serving as one of a circuit closing command and a circuit opening command and supplies the switching element and a determination storing circuit with the control output signal;
the switching element generates a state detection signal according to open/closed-circuit states of the switching element, and supplies the determination storing circuit with the state detection signal;
the determination storing circuit is configured to;
detect, when the control output signal is the circuit closing command, whether the switching element has normally been brought into a closed-circuit state and store a result of the detection, thereby generating a closed-circuit determination storing signal;
detect, when the control output signal is the circuit opening command, whether the switching element has normally been brought into an open-circuit state and store a result of the detection, thereby generating an open-circuit determination storing signal; and
one of reset the stored information by itself when the monitoring/controlling means has read the determination storing signal and periodically reset forcedly the stored information by a command of the monitoring/controlling means; and
the monitoring/controlling means further periodically reads and stores the closed-circuit determination storing signal and the open-circuit determination storing signal serving as the determination storing signal before the determination storing circuit is reset, thereby determining the presence/absence of the abnormal state according to a combination of logics relating to a signal voltage level of the determination storing signal stored before.
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Accused Products
Abstract
Provided is a drive control device capable of surely detecting, by a monitoring/controlling unit, an abnormality of a short circuit and a disconnection in a power supply circuit to an electric load, and of decreasing a load required for a quick response imposed on the monitoring/controlling unit. A switching element is controlled to open/close by a control output signal generated by a monitoring/controlling unit, and a determination storing circuit determines whether circuit opening and circuit closing have been correctly carried out and stores a result of the determination, and periodically reports to the monitoring/controlling unit. While the stored content of the determination is periodically reset, the determination operation is updated and continues. The monitoring/controlling unit does not need to immediately monitor the determination storing signal when the open/closing command is generated.
19 Citations
20 Claims
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1. A drive control device for an electric load, comprising:
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a switching element serially connected to an electric load to which a power is supplied from a drive power source; and monitoring/controlling means for controlling opening/closing of the switching element, and monitoring presence/absence of an abnormal state of a power supply circuit for the electric load, wherein; the monitoring/controlling means generates a control output signal serving as one of a circuit closing command and a circuit opening command and supplies the switching element and a determination storing circuit with the control output signal; the switching element generates a state detection signal according to open/closed-circuit states of the switching element, and supplies the determination storing circuit with the state detection signal; the determination storing circuit is configured to; detect, when the control output signal is the circuit closing command, whether the switching element has normally been brought into a closed-circuit state and store a result of the detection, thereby generating a closed-circuit determination storing signal; detect, when the control output signal is the circuit opening command, whether the switching element has normally been brought into an open-circuit state and store a result of the detection, thereby generating an open-circuit determination storing signal; and one of reset the stored information by itself when the monitoring/controlling means has read the determination storing signal and periodically reset forcedly the stored information by a command of the monitoring/controlling means; and the monitoring/controlling means further periodically reads and stores the closed-circuit determination storing signal and the open-circuit determination storing signal serving as the determination storing signal before the determination storing circuit is reset, thereby determining the presence/absence of the abnormal state according to a combination of logics relating to a signal voltage level of the determination storing signal stored before. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification