ELECTRONIC CONTROL SYSTEM AND POWER SUPPLY UNIT OF THE SYSTEM
First Claim
1. An electronic control system, comprising:
- a power supply unit which receives an input voltage from an external power source through an input line and produces a supply voltage lower than the input voltage from the input voltage; and
a control unit which is transferred from a standby mode to a normal operation mode in response to satisfaction of a wake-up condition, receives a first quantity of electric current set at the supply voltage from the power supply unit through a supply line in the normal operation mode to consume the first quantity of electric current, and receives a second quantity of electric current of the supply voltage from the power supply unit through the supply line in the standby mode to consume the second quantity of electric current, the second quantity being smaller than the first quantity,wherein the power supply unit comprises;
a voltage drop type switching regulator, having a capacitor, which applies the input voltage of the input line to a connection line in response to the standby mode of the control unit while accumulating electric charge in the capacitor, starts performing a switching operation in response to the satisfaction of the wake-up condition in the control unit to produce a transfer voltage on the connection line from the input voltage of the input line and to adjust the transfer voltage to an intermediate voltage, and performs the switching operation in response to the normal operation mode of the control unit to produce the intermediate voltage on the connection line from the input voltage of the input line; and
a series regulator which produces the supply voltage on the supply line from either the input voltage of the input line or the input voltage of the connection line applied by the switching regulator in case of the standby mode of the control unit, starts a voltage regulating operation for the transfer voltage of the connection line in response to the satisfaction of the wake-up condition while using the electric charge of the capacitor of the switching regulator, and produces the supply voltage on the supply line from the intermediate voltage of the connection line produced by the switching regulator in response to the normal operation mode of the control unit.
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Accused Products
Abstract
A power supply unit for supplying electric current of a supply voltage to a control unit in an electronic control system has switching regulator dropping an input voltage to an intermediate voltage, a first series regulator producing electric current of the supply voltage from the intermediate voltage, and a second series regulator producing electric current of the supply voltage lower than electric current produced in the first series regulator During the standby mode of the control unit, an FET of the switching regulator is locked to the on state to accumulate electric charge in a capacitor of a smoothing circuit, while an output transistor of the first series regulator is locked to the off state. When a wake-up condition is satisfied in the control unit, the FET starts the switching operation, and the output transistor immediately starts the driving operation while using the charge supplied from the capacitor.
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Citations
17 Claims
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1. An electronic control system, comprising:
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a power supply unit which receives an input voltage from an external power source through an input line and produces a supply voltage lower than the input voltage from the input voltage; and a control unit which is transferred from a standby mode to a normal operation mode in response to satisfaction of a wake-up condition, receives a first quantity of electric current set at the supply voltage from the power supply unit through a supply line in the normal operation mode to consume the first quantity of electric current, and receives a second quantity of electric current of the supply voltage from the power supply unit through the supply line in the standby mode to consume the second quantity of electric current, the second quantity being smaller than the first quantity, wherein the power supply unit comprises; a voltage drop type switching regulator, having a capacitor, which applies the input voltage of the input line to a connection line in response to the standby mode of the control unit while accumulating electric charge in the capacitor, starts performing a switching operation in response to the satisfaction of the wake-up condition in the control unit to produce a transfer voltage on the connection line from the input voltage of the input line and to adjust the transfer voltage to an intermediate voltage, and performs the switching operation in response to the normal operation mode of the control unit to produce the intermediate voltage on the connection line from the input voltage of the input line; and a series regulator which produces the supply voltage on the supply line from either the input voltage of the input line or the input voltage of the connection line applied by the switching regulator in case of the standby mode of the control unit, starts a voltage regulating operation for the transfer voltage of the connection line in response to the satisfaction of the wake-up condition while using the electric charge of the capacitor of the switching regulator, and produces the supply voltage on the supply line from the intermediate voltage of the connection line produced by the switching regulator in response to the normal operation mode of the control unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power supply unit which receives an input voltage from an external power source through an input line, produces a supply voltage lower than the input voltage from the input voltage, supplies a first quantity of electric current set at the supply voltage to a control unit set in a normal operation mode through a supply line, and supplies a second quantity of electric current set at the supply voltage to the control unit set in a standby mode through the supply line, the standby mode of the control unit being transferred to the normal operation mode in response to cancellation of the standby mode, the second quantity being smaller than the first quantity, comprising:
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a voltage drop type switching regulator, having a capacitor, which applies the input voltage of the input line to a connection line in response to the standby mode of the control unit while accumulating electric charge in the capacitor, starts performing a switching operation in response to the cancellation of the standby mode in the control unit to produce a transfer voltage on the connection line from the input voltage of the input line and to adjust the transfer voltage to an intermediate voltage, and performs the switching operation in response to the normal operation mode of the control unit to produce the intermediate voltage on the connection line from the input voltage of the input line; and a series regulator which produces the supply voltage on the supply line from either the input voltage of the input line or the input voltage of the connection line applied by the switching regulator in case of the standby mode of the control unit, starts a voltage regulating operation for the transfer voltage of the connection line in response to the cancellation of the standby mode in the control unit while using the electric charge of the capacitor of the voltage drop type switching regulator, and produces the supply voltage on the supply line from the intermediate voltage of the connection line produced by the switching regulator in response to the normal operation mode of the control unit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification