Control apparatus and control method for voltage conversion apparatus
AssigneeToyota Jidosha Kabushiki Kaisha
InventorEiji Sato
Life of this patent
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Abstract
The SOC of a battery is calculated based on the voltage Vb and current Ib of a battery, and a battery electromotive voltage Vbo is calculated based on the SOC of the battery. Based on the battery electromotive voltage Vbo and the voltage Vc of a capacitor connected on the output side of the DC/DC converter, a duty ratio D(=Vbo/2Vc) achieving the maximum battery power is set as the lower limit value DL of the optimum duty range DR, so that the lower limit value DL is varied according to the SOC of the battery. The duty ratio D is limited so as to fall within the optimum duty range DR, and the DC/DC converter is controlled to be driven using the limited duty ratio D.
Claims18
A control apparatus for use in a voltage conversion apparatus which converts, for output, a DC voltage supplied from a chargeable and dischargeable storage battery into a desired voltage through switching operation of a switching element, the control apparatus capable of controlling a voltage conversion ratio by adjusting a duty ratio of a switching control signal to be supplied to the switching element, comprising:
- an acceptable range setting unit for setting the acceptable range of the duty ratio of a switching control signal based on power characteristics of the storage battery representing a relationship of the power of the storage battery relative to the duty ratio;
- a duty ratio limit unit for limiting the duty ratio of the switching control signal such that the duty ratio falls in the acceptable range;
- and
- a state of charge acquiring unit for acquiring information about a state of charge of the storage battery,
- wherein the acceptable range setting unit changes the acceptable range relative to variation in the state of charge of the storage battery.
A control apparatus for use in a voltage conversion apparatus which converts, for output, a DC voltage supplied from a chargeable and dischargeable storage battery into a desired voltage through switching operation of a switching element, the control apparatus capable of controlling a voltage conversion ratio by adjusting a duty ratio of a switching control signal to be supplied to the switching element, comprising:
- an acceptable range setting unit for setting an acceptable range of the duty ratio of a switching signal such that a current of the storage battery falls within a predetermined range;
- a duty ratio limit unit for limiting the duty ratio of the switching control signal such that the duty ratio falls in the acceptable range;
- and
- a state of charge acquiring unit for acquiring information about a state of charge of the storage battery,
- wherein the acceptable range setting unit changes the acceptable range relative to variation in the state of charge of the storage battery.
A control apparatus for use in a voltage conversion apparatus which converts, for output, a DC voltage supplied from a chargeable and dischargeable storage battery into a desired voltage through switching operation of a switching element, the control apparatus capable of controlling a voltage conversion ratio by adjusting a duty ratio of a switching control signal to be supplied to the switching element, comprising:
- a current detection unit for detecting a current of the storage battery;
- an acceptable range setting unit for setting an acceptable range of the current of the storage battery based on power characteristics of the storage battery representing a relationship of the power relative to the current of the storage battery;
- a duty ratio limit unit for limiting the duty ratio of the switching control signal such that the current of the storage battery falls in the acceptable range;
- and
- a state of charge acquiring unit for acquiring information about a state of charge of the storage battery,
- wherein the acceptable range setting unit changes the acceptable range relative to variation in the state of charge of the storage battery.
A control apparatus for use in a voltage conversion apparatus which converts, for output, a DC voltage supplied from a chargeable and dischargeable storage battery into a desired voltage through switching operation of a switching element, the control apparatus capable of controlling a voltage conversion ratio by adjusting a duty ratio of a switching control signal to be supplied to the switching element, comprising:
- a voltage detection unit for detecting a voltage of the storage battery;
- a duty ratio limit unit for limiting the duty ratio of the switching control signal such that the voltage of the storage battery falls in the acceptable range;
- a state of charge acquiring unit for acquiring information about a state of charge of the storage battery;
- and
- an acceptable range setting unit for changing the acceptable range relative to variation in the state of charge of the storage battery.
A control method for use by a voltage conversion apparatus which converts, for output, a DC voltage supplied from a chargeable and dischargeable storage battery into a desired voltage through switching operation of a switching element, the control method capable of controlling a voltage conversion ratio by adjusting a duty ratio of a switching control signal to be supplied to the switching element, comprising:
- acquiring information about a state of charge of the storage battery;
- setting an acceptable range of the duty ratio of a switching control signal based on power characteristics of the storage battery representing a relationship of the power of the storage battery relative to the duty ratio of a switching control signal while changing the acceptable range of the duty ratio of the switching control signal relative to variation in the state of charge of the storage battery;
- and
- limiting the duty ratio of the switching control signal such that the duty ratio falls in the acceptable range.
A control method for use by a voltage conversion apparatus which converts, for output, a DC voltage supplied from a chargeable and dischargeable storage battery into a desired voltage through switching operation of a switching element, the control method capable of controlling a voltage conversion ratio by adjusting a duty ratio of a switching control signal to be supplied to the switching element, comprising:
- acquiring information about a state of charge of the storage battery;
- setting an acceptable range of the duty ratio of the switching control signal such that a current of the storage battery falls in a predetermined setting range while changing the acceptable range of the duty ratio of the switching control signal relative to variation in the state of charge of the storage battery;
- and
- limiting the duty ratio of the switching control signal such that the duty ratio falls in the acceptable range.
A control method for use by a voltage conversion apparatus which converts, for output, a DC voltage supplied from a chargeable and dischargeable storage battery into a desired voltage through switching operation of a switching element, the control method capable of controlling a voltage conversion ratio by adjusting a duty ratio of a switching control signal to be supplied to the switching element, comprising:
- detecting a current of a storage battery;
- acquiring information about a state of charge of the storage battery;
- setting an acceptable range of the current of the storage battery based on power characteristics of the storage battery representing a relationship of the power relative to the current of the storage battery while changing the acceptable range of the current of the storage battery relative to variation in the state of charge of the storage battery;
- and
- limiting the duty ratio of the switching control signal such that the current of the storage battery falls in the acceptable range.
A control method for use by a voltage conversion apparatus which converts, for output, a DC voltage supplied from a chargeable and dischargeable storage battery into a desired voltage through switching operation of a switching element, the control method capable of controlling a voltage conversion ratio by adjusting a duty ratio of a switching control signal to be supplied to the switching element, comprising:
- detecting a voltage of the storage battery;
- acquiring information about a state of charge of the storage battery;
- changing an acceptable range of the voltage of the storage battery relative to variation in the state of charge of the storage battery;
- and
- limiting the duty ratio of the switching control signal such that the voltage of the storage battery falls in the acceptable range.
Dependencies are inferred from the claim text.