CONTACTLESS POWER-FEED EQUIPMENT
First Claim
1. Contactless power-feed equipment comprising an induction line placed along a travel path of a movable body and fed with an AC current, or an induction coil that is disposed at a predetermined position for holding a device and fed with an AC current,the movable body including a power-receiving coil on which an electromotive force is induced by a magnetic flux generated on the induction line, or the device including a power-receiving coil on which an electromotive force is induced by a magnetic flux generated on the induction coil,the contactless power-feed equipment comprising:
- a DC power-supply device that supplies a DC current;
a DC choke having one end connected to a positive output terminal of the DC power-supply device;
an insulating transformer including a center-tapped primary coil having a center tap connected to another end of the DC choke and a secondary coil connected to one of the induction line and the induction coil;
a resonance capacitor that is connected in parallel with the secondary coil and forms a resonance circuit with one of the induction line and the induction coil at a predetermined frequency;
a first diode having an anode connected to one end of the center-tapped primary coil;
a second diode having an anode connected to another end of the center-tapped primary coil;
a first switching element including a transistor connected between a cathode of the first diode and a negative output terminal of the DC power-supply device;
a second switching element including a transistor connected between a cathode of the second diode and the negative output terminal of the DC power-supply device;
a first Zener diode having a cathode connected to the one end of the center-tapped primary coil and a base of the transistor forming the second switching element and an anode connected to the negative output terminal of the DC power-supply device; and
a second Zener diode having a cathode connected to the other end of the center-tapped primary coil and a base of the transistor forming the first switching element and an anode connected to the negative output terminal of the DC power-supply device,wherein a current passing through the first Zener diode from the one end of the center-tapped primary coil drives the transistor forming the second switching element, a current passing through the second Zener diode from the other end of the center-tapped primary coil drives the transistor forming the first switching element, and the transistor forming the first switching element and the transistor forming the second switching element are alternately driven so as to pass the AC current through the secondary coil at the predetermined frequency.
1 Assignment
0 Petitions
Accused Products
Abstract
In order to provide contactless power-feed equipment that can avoid excessive energy consumption upon switching, a primary side includes a DC power-supply device 11, a power-feed device 12, and a power-feed unit 13 and a secondary side includes a power-receiving unit 15. The power-feed device 12 includes: an insulating transformer 24 including a primary coil 22 with a center tap 22a fed with a DC current and a secondary coil 23 connected to the power-feed unit 13; a resonance capacitor 25 connected in parallel with the secondary coil 23 of the insulating transformer 24; a first diode 26 and a first Zener diode 29 that are connected to one end 22b of the primary coil 22; a second diode 27 and a second Zener diode 32 that are connected to the other end 22c of the primary coil 22; a first transistor 35 connected to the first diode 26, and a second transistor 36 connected to the second diode 27.
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Citations
12 Claims
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1. Contactless power-feed equipment comprising an induction line placed along a travel path of a movable body and fed with an AC current, or an induction coil that is disposed at a predetermined position for holding a device and fed with an AC current,
the movable body including a power-receiving coil on which an electromotive force is induced by a magnetic flux generated on the induction line, or the device including a power-receiving coil on which an electromotive force is induced by a magnetic flux generated on the induction coil, the contactless power-feed equipment comprising: -
a DC power-supply device that supplies a DC current; a DC choke having one end connected to a positive output terminal of the DC power-supply device; an insulating transformer including a center-tapped primary coil having a center tap connected to another end of the DC choke and a secondary coil connected to one of the induction line and the induction coil; a resonance capacitor that is connected in parallel with the secondary coil and forms a resonance circuit with one of the induction line and the induction coil at a predetermined frequency; a first diode having an anode connected to one end of the center-tapped primary coil; a second diode having an anode connected to another end of the center-tapped primary coil; a first switching element including a transistor connected between a cathode of the first diode and a negative output terminal of the DC power-supply device; a second switching element including a transistor connected between a cathode of the second diode and the negative output terminal of the DC power-supply device; a first Zener diode having a cathode connected to the one end of the center-tapped primary coil and a base of the transistor forming the second switching element and an anode connected to the negative output terminal of the DC power-supply device; and a second Zener diode having a cathode connected to the other end of the center-tapped primary coil and a base of the transistor forming the first switching element and an anode connected to the negative output terminal of the DC power-supply device, wherein a current passing through the first Zener diode from the one end of the center-tapped primary coil drives the transistor forming the second switching element, a current passing through the second Zener diode from the other end of the center-tapped primary coil drives the transistor forming the first switching element, and the transistor forming the first switching element and the transistor forming the second switching element are alternately driven so as to pass the AC current through the secondary coil at the predetermined frequency. - View Dependent Claims (3, 4, 5, 6, 9, 10, 11, 12)
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2. (canceled)
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7. Contactless power-feed equipment comprising an induction line placed along a travel path of a movable body and fed with an AC current, or an induction coil that is disposed at a predetermined position for holding a device and fed with an AC current,
the movable body including a power-receiving coil on which an electromotive force is induced by a magnetic flux generated on the induction line, or the device including a power-receiving coil on which an electromotive force is induced by a magnetic flux generated on the induction coil, the contactless power-feed equipment comprising: -
a DC power-supply device that supplies a DC current; a DC choke having one end connected to a positive output terminal of the DC power-supply device; an insulating transformer including a center-tapped primary coil having a center tap connected to another end of the DC choke and a secondary coil connected to one of the induction line and the induction coil; a resonance capacitor that is connected in parallel with the secondary coil and forms a resonance circuit with one of the induction line and the induction coil at a predetermined frequency; a first switching element including a transistor connected between one end of the center-tapped primary coil and a negative output terminal of the DC power-supply device; a second switching element including a transistor connected between another end of the center-tapped primary coil and the negative output terminal of the DC power-supply device; a first constant current diode having an anode connected to the one end of the center-tapped primary coil; a first Zener diode having a cathode connected to a cathode of the first constant current diode and a base of the transistor forming the second switching element and an anode connected to the negative output terminal of the DC power-supply device; a second constant current diode having an anode connected to the other end of the center-tapped primary coil; and a second Zener diode having a cathode connected to a cathode of the second constant current diode and a base of the transistor forming the first switching element and an anode connected to the negative output terminal of the DC power-supply device, wherein a current passing through the first constant current diode and the first Zener diode from the one end of the center-tapped primary coil drives the transistor forming the second switching element, a charge of the base of the second transistor at this point is discharged to the one end of the primary coil, the second transistor is completely placed into a non-conducting state, a current passing through the second constant current diode and the second Zener diode from the other end of the center-tapped primary coil drives the transistor forming the first switching element, a charge of the base of the first transistor at this point is discharged to the other end of the primary coil, and the first transistor is placed into a non-conducting state. - View Dependent Claims (8)
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Specification