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Circuit for protecting a load control device from high and low voltage conditions
| Details |
Inventors: Kameyama, Shogo;
Assignee: Nippondenso Co., Ltd. (Kariya, JP)
Primary Examiner: Beausoliel, Jr.; Robert W.
Assistant Examiner: Fisch; Alan M.
Attorney, Agent or Firm: Cushman, Darby & Cushman
A protective device for a load-control device which provides preservation of the load-control function of a CPU and prevents misoperation, even if an abnormality occurs, and which comprises a CPU, controlling load in response to sensor signals; a DC voltage-regulation circuit, supplying voltage to the CPU; a current-adjustment means operating so that the power supply line voltage and the DC voltage-regulation circuit output voltage are equal; a voltage-responding means which switches off the current-adjustment means when the power supply line voltage exceeds a prescribed upper limit level; a switching means switching the current-adjustment means off; and a voltage comparison means switching off the current-adjustment means when the power supply line voltage falls below a lower limit level, and wherein the CPU intermittently operates the switching means when the current-adjustment means is switched off. |
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DETAILED DESCRIPTION The object of the present invention is for both the cases in which the power supply line for the sensors is raised to the output voltage of the external power supply and the case in which it is dropped to the ground level, to provide a protective device for a load-control device which not only prevents loss of the CPU load-control function, but also does not cause misoperation of the vehicle.
To achieve the above-stated object, a load-control device comprising a CPU that performs load control based on a signal from a sensor and a DC voltage-regulation circuit which takes the output voltage from an external power supply and supplies it to said CPU.
The present invention provides a voltage-responding means which adjusts the voltage on the power supply line between said sensor and said external power supply to equal the output voltage of said DC voltage-regulation circuit by controlling a current-adjustment means inserted between between said external power supply and said sensor.
It also switches said current-adjustment means to go into the cutoff state when the voltage level on the power supply line reaches or exceeds the first reference value, which is the upper limit level.
The present invention also provides a switching means which forcibly switches said current-adjustment means to the cutoff state when it operates, and a voltage-comparison means which when the voltage level on said power supply line drops to or below the lower limit level, which is the second reference value, causes said switching means to operate, thereby switching said current-adjustment means into the cutoff state, and when said current-adjustment means is switched into the cutoff state by said voltage-comparison means, said CPU intermittently halts the operation of said switching means.
If the voltage level of said power supply line returns to normal during the time operation of the switching means has been halted, the CPU disables control of the current adjustment means by the voltage-comparison means
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