Charge-discharge control apparatus and charge-discharge control apparatus method
According to an embodiment, a charge-discharge control apparatus includes a rectifier-voltage decrease detector circuit and an over-discharge suppression controller circuit. On the condition that the rectifier-voltage decrease detector circuit detects that voltage output from a rectifier circuit of a power-receiving device is decreased below a voltage threshold, the over-discharge suppression controller circuit suppresses over-discharge of an inverter circuit of a power-feeding device, or suppresses over-discharge of a battery of the power-receiving device.
1. A charge-discharge control apparatus, comprising:
a power-feeding device including:
an inverter circuit,
a primary coil, a voltage output from the inverter circuit being applied to the primary coil,
a current detector circuit that detects a current output from the inverter circuit and flowing in the primary coil, and
an over-discharge suppression controller circuit;
a power-receiving device including:
a secondary coil that receives power supplied from the primary coil without contacting the primary coil, and
a rectifier circuit that supplies the received power to a load to operate the load and a battery to charge the battery; and
a rectifier-voltage decrease detector circuit that detects that a voltage output from the rectifier circuit decreases to below a predetermined voltage value, wherein
the over-discharge suppression controller circuit is configured to:
determine if the current detected by the current detector circuit exceeds a predetermined current value,
when the current detected by the current detector circuit is determined to exceed the predetermined current value, determine if the rectifier-voltage decrease detector circuit detects that the voltage output from the rectifier circuit has decreased below the predetermined voltage value, and
control the inverter circuit to suppress over-discharge when the rectifier-voltage decrease detector detects that the voltage output from the rectifier circuit decreases below the predetermined voltage.
2. A charge-discharge control apparatus, comprising:
a power-feeding device including:
an inverter circuit,
a primary coil, a voltage output from the inverter circuit being applied to the primary coil, and
an over-discharge suppression controller circuit;
a power-receiving device including:
a secondary coil that receives power supplied from the primary coil without contacting the primary coil, and
a rectifier circuit that supplies the received power to a load to operate the load and a battery to charge the battery; and
a rectifier-voltage decrease detector circuit that detects that a voltage output from the rectifier circuit decreases below a predetermined voltage value, wherein
the over-discharge suppression controller circuit is configured to simultaneously control the battery and the inverter circuit to suppress over-discharge when the rectifier-voltage decrease detector detects that the voltage output from the rectifier circuit has decreased to below the predetermined voltage value.
3. The charge-discharge control apparatus according to claim 2 , wherein
when a current flowing in the battery exceeds a predetermined current value, the over-discharge suppression controller circuit controls a voltage applied to the battery to be decreased according to an amount the current is above the predetermined current value.
4. The charge-discharge control apparatus according to claim 1 , wherein
the rectifier-voltage decrease detector circuit outputs a rectifier-voltage decrease detection signal when the voltage output from the rectifier circuit decreases to below the predetermined voltage value.
5. The charge-discharge control apparatus according to claim 4 , wherein
the secondary coil is supplied with power from the primary coil by using a magnetic-field resonant method.
6. A charge-discharge control method for a charge-discharge control apparatus, the charge-discharge control apparatus including:
a power-feeding device including:
an inverter circuit,
a primary coil, a voltage output from the inverter circuit being applied to the primary coil,
a current detector circuit that detects a current output from the inverter circuit and flowing in the primary coil, and
an over-discharge suppression controller circuit;
a power-receiving device including:
a secondary coil that receives power supplied from the primary coil without contacting the primary coil, and
a rectifier circuit that supplies the received power to a load to operate the load and a battery to charge the battery; and
a rectifier-voltage decrease detector circuit,
the method comprising:
detecting that a voltage output from the rectifier circuit decreases to below a predetermined voltage value with the rectifier-voltage decrease detector circuit;
determining, using the over-discharge suppression controller, if the current detected by the current detector circuit exceeds a predetermined current value;
when the current detected by the current detector circuit is determined to exceed the predetermined current value, determine, using the over-charge suppression circuit, if the rectifier-voltage decrease detector circuit detects that the voltage output from the rectifier circuit has decreased below the predetermined voltage value; and
controlling, with the over-discharge suppression controller circuit, the inverter circuit to suppress over-discharge when the rectifier-voltage decrease detector detects that the voltage output from the rectifier circuit decreased below the predetermined voltage.
7. The charge-discharge control method according to claim 6 , wherein
when the current output from the inverter circuit and flowing in the primary coil exceeds a predetermined current value, the over-discharge suppression controller circuit controls the inverter circuit to decrease the output voltage according to an amount the current is above the predetermined current value.
8. The charge-discharge control method according to claim 6 , wherein
the secondary coil is supplied with power from the primary coil by using a magnetic-field resonant method.
9. The charge-discharge control apparatus according to claim 4 , wherein the over-discharge suppression controller circuit determines if the current detected by the current detector circuit exceeds the predetermined current value based on the rectifier-voltage decrease detection signal output by the rectifier-voltage decrease detector circuit.
10. The charge-discharge control apparatus according to claim 2 , wherein
when the current output from the inverter circuit and flowing in the primary coil exceeds a predetermined current value, the over-discharge suppression controller circuit controls the inverter circuit to decrease the output voltage according to an amount the current is above the predetermined current value.