Voltage detection circuit, ECU, automobile with ECU
First Claim
1. A voltage detection circuit, comprising:
- a threshold value generation unit provided between a higher voltage source and a lower voltage source, and configured to generate a setting voltage equal to one Nth part of a voltage of the higher voltage source and to convert the setting voltage to a first current, wherein N is greater than one;
a first resistor having one end connected to a detection terminal;
a detection unit provided between the higher voltage source and the lower voltage source, the detection unit having an input port connected to an output port of the threshold value generation unit, the detection unit having a first output port connected to the other end of the first resistor and further having a second output port, the detection unit being configured to detect the first current and configured such that the detection unit causes a constant detection terminal input current to flow from the detection terminal to the first resistor when an applied voltage applied to the detection terminal is greater than or equal to the voltage of the higher voltage source times the sum of one plus one Nth part; and
a detection output unit provided between the higher voltage source and the lower voltage source, the detection output unit having an input port connected to the second output port of the detection unit, the detection output unit being configured to receive an output signal from the detection unit and configured such that the detection output unit outputs a first signal to a detection output terminal when the applied voltage is less than the voltage of the higher voltage source times the sum of one plus one Nth part, the detection output unit being configured to output a second signal to the detection output terminal when the application voltage is greater than or equal to the voltage of the higher voltage source times the sum of one plus one Nth part.
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Accused Products
Abstract
According to an embodiment, the threshold value generation unit generates a setting voltage and converts the setting voltage to a first current. One end of the first resistor is connected to a detection terminal. When a voltage applied to the detection terminal is greater than or equal to a predetermined factor times the voltage of the higher voltage source, the detection unit causes a constant detection terminal input current to flow from the detection terminal to the first resistor. When the voltage at the detection terminal is less than the predetermined factor times the voltage of the higher voltage source, a higher voltage source voltage is outputted to a detection output terminal, while the voltage at the detection terminal is greater than or equal to the predetermined factor times the voltage of the higher voltage source, a lower voltage source voltage is outputted to the detection output terminal.
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Citations
13 Claims
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1. A voltage detection circuit, comprising:
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a threshold value generation unit provided between a higher voltage source and a lower voltage source, and configured to generate a setting voltage equal to one Nth part of a voltage of the higher voltage source and to convert the setting voltage to a first current, wherein N is greater than one; a first resistor having one end connected to a detection terminal; a detection unit provided between the higher voltage source and the lower voltage source, the detection unit having an input port connected to an output port of the threshold value generation unit, the detection unit having a first output port connected to the other end of the first resistor and further having a second output port, the detection unit being configured to detect the first current and configured such that the detection unit causes a constant detection terminal input current to flow from the detection terminal to the first resistor when an applied voltage applied to the detection terminal is greater than or equal to the voltage of the higher voltage source times the sum of one plus one Nth part; and a detection output unit provided between the higher voltage source and the lower voltage source, the detection output unit having an input port connected to the second output port of the detection unit, the detection output unit being configured to receive an output signal from the detection unit and configured such that the detection output unit outputs a first signal to a detection output terminal when the applied voltage is less than the voltage of the higher voltage source times the sum of one plus one Nth part, the detection output unit being configured to output a second signal to the detection output terminal when the application voltage is greater than or equal to the voltage of the higher voltage source times the sum of one plus one Nth part. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A voltage detection circuit, comprising:
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a threshold value generation unit including a first resistor having one end connected to a higher voltage source, and a first diode having a cathode connected to the other end of the first resistor, and having an anode connected to a lower voltage source, the threshold value generation unit being configured to generate a setting voltage equal to one Nth part of a voltage of the higher voltage source between both ends of the first resistor, wherein N is greater than one; a second resistor having one end connected to a detection terminal; a detection unit provided between the higher voltage source and the lower voltage source, the detection unit having an input port connected to an output port of the threshold value generation unit, the detection unit having a first output port connected to the other end of the first resistor and further having a second output port, and configured such that a voltage which has been reduced from the voltage of the higher voltage source by the setting voltage is inputted to the detection unit from the threshold value generation unit and the detection unit is connected to the other end of the second resistor, the detection unit being configured to cause a constant detection terminal input current to flow from the detection terminal to the second resistor when an applied voltage applied to the detection terminal is greater than or equal to the voltage of the higher voltage source times the sum of one plus one Nth part; and a detection output unit provided between the higher voltage source and the lower voltage source, the detection output unit having an input port connected to the second output port of the detection unit, the detection output unit being configured to receive an output signal from the detection unit and configured such that the detection output unit outputs a first signal to a detection output terminal when the application voltage is less than the voltage of the higher voltage source times the sum of one plus one Nth part, the detection output unit being configured to output a second signal to the detection output terminal when the application voltage is greater than or equal to the voltage of the higher voltage source times the sum of one plus one Nth part, wherein, when a short-to-power occurs, the detection unit sets the voltage between both ends of the second resistor to the same value as the setting voltage between both ends of the first resistor. - View Dependent Claims (9, 10)
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11. An electronic control unit (ECU) comprising:
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an output drive unit; a voltage detection circuit; and a control unit configured to control the output drive unit, the ECU being configured to output an output drive signal from the output drive unit, wherein the output drive unit outputs the output drive signal for operating a target controlled unit via a detection terminal, and wherein the voltage detection circuit includes a threshold value generation unit provided between a higher voltage source and a lower voltage source, and configured to generate a setting voltage equal to one Nth part of a voltage of the higher voltage source and to convert the setting voltage to a first current, wherein N is greater than one, a first resistor having one end connected to the detection terminal, a detection unit provided between the higher voltage source and the lower voltage source, the detection unit having an input port connected to an output port of the threshold value generation unit, the detection unit having a first output connected to the other end of the first resistor and further having a second output port, the detection unit configured to detect the first current and configured such that the detection unit causes a constant detection terminal input current to flow from the detection terminal to the first resistor when an application voltage applied to the detection terminal is greater than or equal to the voltage of the higher voltage source times the sum of one and one Nth part, and a detection output unit provided between the higher voltage source and the lower voltage source, the detection output unit having an input port connected to the second output port of the detection unit, the detection output unit configured to receive an output signal from the detection unit and configured such that the detection output unit outputs a first signal to a detection output terminal when the application voltage is less than the voltage of the higher voltage source times the sum of one and one Nth part, the detection output unit being configured to output a second signal to the detection output terminal when the application voltage is greater than or equal to the voltage of the higher voltage source times the sum of one and one Nth part, and wherein the control unit receives a signal outputted from the detection output unit via the detection output terminal, the control unit being configured to output a control signal to stop an operation of the output drive unit when a voltage applied to the detection terminal is greater than or equal to the sum of the voltage of the higher voltage source and the setting voltage. - View Dependent Claims (12, 13)
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Specification