1. An inductive power transfer system for coupling a power source to a load across an air gap, comprising:
a primary unit associated with a host platform and a secondary unit for applying a voltage to a load, the secondary unit being separable from the primary unit and arranged to receive power inductively from the primary unit when placed proximate thereto, the primary unit comprising a primary transformer winding and switching means for controlling the application of power to the primary winding and the secondary unit comprising a secondary transformer winding;
control means comprising a multi-stage comparator circuit for monitoring the applied voltage; and
feedback means for transmitting a feedback signal to the primary unit when the applied voltage falls below a lower predetermined voltage and for deactivating said feedback signal when the applied voltage exceeds an upper predetermined voltage, wherein the primary unit is arranged to operate in a low power mode where power is applied to the primary winding for minimal period during each switching cycle when no feedback signal is received and a high power mode where power is applied to the primary winding for a majority of each switching cycle when a feedback signal is received so that the applied voltage can be regulated between the upper and the lower predetermined voltages.
2. An inductive power transfer system according to claim 1, wherein in the high power operating mode, power is applied to the primary winding except during a dead-band period at the beginning and end of each switching cycle.
3. An inductive power transfer system according to claims 1, wherein the multi-stage comparator is operable to monitor the voltage induced in the secondary winding and to output a signal to the feedback means when the induced voltage exceeds a first predetermined voltage causing a feedback signal to be transmitted to the primary unit.
4. An inductive power transfer system according to claim 1, wherein the multi-stage comparator is arranged to monitor the voltage level in a storage capacitor coupled to the secondary winding and to activate an output switch to apply power to the load when the voltage level exceeds a second predetermined voltage.
5. An inductive power transfer system according to claim 4, wherein the multi-stage comparator circuit is operable to monitor the voltage applied to the load and to output a signal to the feedback means when the applied voltage exceeds said upper predetermined voltage causing the feedback signal to the primary unit to be deactivated.
6. An inductive power transfer system according to claim 5, wherein the multi-stage comparator is operable to output a signal to the feedback means when the applied voltage falls below said lower predetermined voltage causing a feedback signal to be transmitted to the primary unit.
7. An inductive power transfer system according to claim 1, further comprising a tuning capacitor connected in parallel with the secondary winding.
8. An inductive power transfer system according to claim 7, wherein the tuning capacitor is arranged to resonate at a predetermined frequency when the width of the air gap separating the transformer cores of the primary and secondary windings is a predetermined maximum value.
9. An inductive power transfer system according to claim 1, wherein the width of the air gap between the primary and secondary windings lies in the range 1 to 6 mm.
10. An inductive power transfer system according to claim 1, wherein in low power mode operation, power is applied to the primary winding for 5% of the switching cycle.
11. An inductive power transfer system according to claim 1, wherein in high power mode operation, power is applied to the primary winding for 95% of the switching cycle.
12. An inductive power transfer system according to claim 1, wherein the power source is arranged to produce an output dc voltage of 270V.
13. An inductive power transfer system according to claim 1, wherein the power source includes a local power source arranged to supply components within the primary unit.
14. An inductive power transfer system according to claim 1, wherein the feedback means comprises an infrared system.
15. An inductive power transfer system according to claim 1, wherein the switching means comprises a power amplifier that applies power to the primary winding in a push-pull format.
16. An inductive power transfer system according to claim 1, wherein the primary unit is carried by a host aircraft and the secondary unit is carried by a launchable vehicle.
17. An inductive power transfer system according to claim 1, wherein said applied voltage can be regulated between the upper and the lower predetermined voltages independent of variations of the input supply to the primary unit, variations in the air gap between the primary and secondary units and variations in the current demanded by the load.
18. An inductive power transfer system according to claim 1, wherein a storage capacitor is coupled to the secondary winding and when the applied voltage exceeds an upper predetermined voltage and the feedback signal is deactivated the storage capacitor discharges into the load.
19. An inductive power transfer system for coupling a power source to a load across an air gap, comprising:
a primary unit associated with a host platform and a secondary unit for applying a voltage to the load, the secondary unit being separable from the primary unit and arranged to receive power inductively from the primary unit when placed proximate thereto, the primary unit comprising a primary transformer winding and switches for controlling the application of power to the primary winding and the secondary unit comprising a secondary transformer winding;
a control circuit comprising a multi-stage comparator circuit for monitoring the applied voltage; and
a feedback loop for transmitting a feedback signal to the primary unit when the applied voltage falls below a lower predetermined voltage and for deactivating said feedback signal when the applied voltage exceeds an upper predetermined voltage, wherein the primary unit is arranged to operate in a low power mode where power is applied to the primary winding for minimal period during each switching cycle when no feedback signal is received and a high power mode where power is applied to the primary winding for the majority of each switching cycle when a feedback signal is received so that the applied voltage can be regulated between the upper and the lower predetermined voltages.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An organic compound represented by general formula 1:
wherein R1 to R6 are each independently selected from a hydrogen atom, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted aryl group.
2. An organic light-emitting device comprising a pair of electrodes and an organic compound layer disposed therebetween, the organic compound layer containing the organic compound according to claim 1.
3. The organic light-emitting device according to claim 2, wherein the organic compound layer is a light-emitting layer.
4. The organic light-emitting device according to claim 3, wherein the organic light-emitting device emits blue light.
5. A display apparatus comprising a plurality of pixels, each including the organic light-emitting device according to claim 2 and a switching device connected to the organic light-emitting device.
6. An image output apparatus comprising an image input unit configured to input an image and a display unit configured to output the image, the display unit having a plurality of pixels, each including the organic light-emitting device according to claim 2 and a switching device connected to the organic light-emitting device.
7. An illuminating device comprising the organic light-emitting device according to claim 2.
8. An exposure light source of an electrophotographic image-forming apparatus, wherein the exposure light source comprises the organic light-emitting device according to claim 2.
9. An electrophotographic image-forming apparatus comprising an exposure light source, wherein the exposure light source comprises the organic light-emitting device according to claim 2.