Secondary-side power receiving circuit of noncontact power supplying equipment

• US 7,710,751 B2
• Filed: 04/21/2006
• Issued: 05/04/2010
• Est. Priority Date: 04/22/2005
• Status: Active Grant

• Current Assignee: Daifuku Company Limited
• Original Assignee: Daifuku Company Limited
• Inventors: Nishino, Shuzo
• Primary Examiner(s): Vu; Bao Q
• Application Number:
  US11/918,802
• Publication Number:
  US 20090067207A1
• Time in Patent Office: 1,474 Days
• Field of Search: 363/67, 363/68, 363/125, 363/126
• US Class Current: 363/67
• CPC Class Codes: B60L 5/005 without mechanical contact between the collector and the power supply line
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 7/08 arranged for operation in parallel
• CPC Class Codes: H02M 7/2176 comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output

Abstract

A plurality of pickup coils 2A and 2B are provided, resonance capacitors 3A and 3B forming resonance circuits 4A and 4B resonating at the frequency of an inductive path 1 are respectively connected in series with the pickup coils 2A and 2B, and the resonance circuits 4A and 4B are connected in series. Further, the resonance circuits 4A and 4B are respectively provided with rectifier circuits 6A and 6B for rectifying voltages generated by the resonance circuits 4A and 4B. The rectifier circuits 6A and 6B are connected in parallel and feed power to a load 10. Moreover, a switch 5 is provided to switch a connected state and an open state between the resonance circuits 4A and 4B, and a voltage controller 11 is provided to control an output voltage applied to the load 10, by controlling the switch 5.

Claims

1. A secondary-side power receiving circuit of noncontact power supplying equipment, comprising:

a plurality of pickup coils which are opposed to a primary-side inductive path for passing a high-frequency current and are fed with an electromotive force induced by the inductive path,

resonance circuits including resonance capacitors respectively connected in series with the pickup coils and resonating at a frequency of the inductive path, the resonance circuits being connected in series,

the resonance circuits respectively including rectifier circuits rectifying voltages generated by the resonance circuits, the rectifier circuits being connected in parallel to supply power to a load having varying power consumption,

a switching unit for switching a connected state and an open state between the resonance circuits, and

a voltage control unit for controlling an output voltage applied to the load, by controlling the switching unit,

wherein the switching unit includes a transformer having a primary-side winding connected in series between the resonance circuits,

a rectifier having an input end connected to a secondary-side winding of the transformer, and

a switching device connected between the output ends of the rectifier, and

the voltage control unit controls the output voltage applied to the load, by opening and closing the switching device of the switching unit.

2. The secondary-side power receiving circuit of the noncontact power supplying equipment according to claim 1, wherein the primary-side winding and the secondary-side winding of the transformer have a turns ratio of 1:

1 and the primary-side winding of the transformer has an impedance higher than a resistance of the load under light load conditions.

3. A secondary-side power receiving circuit of noncontact power supplying equipment, comprising:

pickup coils which are opposed to a primary-side inductive path for passing a high-frequency current and are fed with an electromotive force induced by the inductive path,

resonance circuits including resonance capacitors connected in series with the pickup coils and resonating at a frequency of the inductive path,

a rectifier circuit for rectifying a voltage generated by the resonance circuits and feeding power to a load having varying power consumption,

two output capacitors connected in series with an equal capacitance and connected between output ends of the rectifier circuit,

a switching unit for switching a connected state and an open state between a junction of the two output capacitors and one end of the resonance circuits, and

a voltage control unit for controlling an output voltage applied to the load, by controlling the switching unit,

wherein the switching unit comprises;

a transformer having a primary-side winding connected in series between the junction of the two output capacitors and the one end of the resonance circuits,

a rectifier having an input end connected to a secondary-side winding of the transformer, and

a switching device connected between output ends of the rectifier, and

the voltage control unit controls the output voltage applied to the load, by opening and closing the switching device of the switching unit.

4. A secondary-side power receiving circuit of noncontact power supplying equipment, comprising:

pickup coils which are opposed to a primary-side inductive path for passing a high-frequency current and are fed with an electromotive force induced by the inductive path,

resonance circuits including resonance capacitors connected in series with the pickup coils and resonating at a frequency of the inductive path,

a booster for boosting a voltage generated by the resonance circuits and feeding the boosted voltage to a load having varying power consumption,

a switching unit for switching a connected state and an open state between the resonance circuits and the booster, and

a voltage control unit for controlling an output voltage applied to the load, by controlling the switching unit,

wherein the booster comprises;

a boosting transformer having a primary-side winding connected in series with The resonance circuits, and

a first rectifier circuit having an input end connected to a secondary-side winding of the boosting transformer and an output end connected to the load,

the switching unit comprises;

a second rectifier circuit having an input end connected to a tertiary winding of the boosting transformer, and

a switching device connected between output ends of the second rectifier circuit, and

the voltage control unit controls an output voltage applied to the load, by opening and closing the switching device of the switching unit.

5. A secondary-side power receiving circuit of noncontact power supplying equipment, comprising:

pickup coils which are opposed to a primary-side inductive path for passing a high-frequency current and are fed with an electromotive force induced by the inductive path,

resonance circuits including resonance capacitors connected in series with the pickup coils and resonating at a frequency of the inductive path,

a switching unit which is connected in series with the resonance circuits and switches a connected state and an open state between the resonance circuits,

a first diode connected across a circuit including the resonance circuits and the switching unit,

a second diode having an anode connected to a cathode of the first diode,

an output capacitor having one end connected to an anode of the first diode and the other end connected to a cathode of the second diode,

a load connected across the output capacitor, and

a voltage control unit for controlling an output voltage applied to the load, by controlling the switching unit,

wherein the switching unit comprises;

a transformer having a primary-side winding connected in series with the resonance circuits,

a rectifier having an input end connected to a secondary-side winding of the transformer, and

a switching device connected between output ends of the rectifier, and

the voltage control unit controls the output voltage applied to the load, by opening and closing the switching device of the switching unit.