TRANSFER CONTROL DEVICE

• US 20120069613A1
• Filed: 05/20/2010
• Published: 03/22/2012
• Est. Priority Date: 06/10/2009
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Nakagawa, Tomoaki
• Granted Patent: US 8,907,647 B2
• Time in Patent Office: Days
• US Class Current: 363/78
• CPC Class Codes: H02M 1/0035 using burst mode control
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators
• CPC Class Codes: H02M 3/1588 comprising at least one synchronous rectifier element H02M3/1582, H02M3/1584 take precedence
• CPC Class Codes: H02M 7/53871 with automatic control of output voltage or current
• CPC Class Codes: H02M 7/797 using semiconductor devices only
• CPC Class Codes: H02P 2201/07 DC-DC step-up or step-down converter inserted between the power supply and the inverter supplying the motor, e.g. to control voltage source fluctuations, to vary the motor speed general aspects of plural converters in cascade H02M
• CPC Class Codes: H02P 27/08 with pulse width modulation
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

There is provided a control device which controls a transformer in accordance with a total loss imposed on a load driving system including the transformer and a load. In a control device of a transformer that boosts or drops an output voltage of a DC power supply and provides the output voltage to a load, the control device includes: a switching controller which performs switching control of the transformer; a load power deriving unit which derives load power; a transformer loss decrease amount deriving unit which derives a decrease amount of loss generated in the transformer, based on the load power derived by the load power deriving unit and a transformer ratio of the transformer, when the switching controller performs intermittent control of the transformer; a load loss increase amount deriving unit which derives an increase amount of loss generated in the load when the switching controller performs the intermittent control of the transformer; and a control command unit which instructs the switching controller to perform the intermittent control of the transformer when the decrease amount of transformer loss derived by the transformer loss decrease amount deriving unit is larger than the increase amount of load loss derived by the load loss increase amount deriving unit.

Claims

1. A control device of a transformer that boosts or drops an output voltage of a DC power supply and provides the output voltage to a load, the control device comprising:

a switching controller which performs switching control of the transformer;

a load power deriving unit which derives load power;

a transformer loss decrease amount deriving unit which derives a decrease amount of loss generated in the transformer, based on the load power derived by the load power deriving unit and a transformer ratio of the transformer, when the switching controller performs intermittent control of the transformer;

a load loss increase amount deriving unit which derives an increase amount of loss generated in the load when the switching controller performs the intermittent control of the transformer; and

a control command unit which instructs the switching controller to perform the intermittent control of the transformer when the decrease amount of transformer loss derived by the transformer loss decrease amount deriving unit is larger than the increase amount of load loss derived by the load loss increase amount deriving unit.

2. The control device of claim 1, further comprising:

a voltage fluctuation allowable amount deriving unit which derives a voltage fluctuation allowable amount of the transformer, based on the load power derived by the load power deriving unit and the transformer ratio of the transformer, when the switching controller performs the intermittent control of the transformer,

wherein the load loss increase amount deriving unit derives an increase amount of loss generated in the load, when the output voltage of the transformer pulsates with a width of the voltage fluctuation allowable amount and the switching controller performs the intermittent control of the transformer.

3. The control device of claim 2, further comprising:

a voltage detector which detects the output voltage of the transformer, and

wherein the switching controller restarts switching control of the transformer, when a change amount of the output voltage of the transformer detected by the voltage detector reaches the voltage fluctuation allowable amount while switching control of the transformer is stopped at the time of the intermittent control of the transformer.

4. The control device of claim 3, wherein the switching controller stops the switching control of the transformer, when the output voltage reaches a command voltage for the transformer when switching control of the transformer is operated at the time of the intermittent control of the transformer.

5. The control device of claim 2, further comprising:

a stoppable time deriving unit which derives a stoppable time when switching control of the transformer can be stopped by the switching controller, in accordance with the load power derived by the load power deriving unit,

wherein the switching controller restarts switching control of the transformer, when the stoppable time has passed after the switching control of the transformer was stopped at the time of the intermittent control of the transformer.

6. The control device of claim 2,

wherein the control device increases a command voltage for the transformer in a range of the voltage fluctuation allowable amount, when the switching controller performs the intermittent control of the transformer in a state where the load consumes electric power.

7. The control device of claim 2,

wherein the control device decreases a command voltage for the transformer in a range of the voltage fluctuation allowable amount, when the switching controller performs the intermittent control of the transformer in a state where the load outputs electric power.

8. The control device of claim 6 or 7, wherein the switching controller starts switching control of the transformer when a deviation between the output voltage and the corrected command voltage is not smaller than a deviation between the uncorrected command voltage and the corrected command voltage at the time of intermittent control of the transformer.

9. The control device of claim 8, wherein the switching controller stops switching control of the transformer when the output voltage reaches the corrected command voltage while switching control of the transformer is operated at the time of intermittent control of the transformer.