Power apparatus

Claim 2

(2) A power apparatus described in accordance with the claim 1, where a pulse power supply is provided with a fly-back transformer.

Claim 3

(3) A power apparatus described in accordance with the claim 1, where a pulse power supply is provided with a means which is adapted to vary an oscillation frequency or a duty ratio so as to control the current to flow into a load.

Claim 4

(4) A power apparatus described in accordance with the claim 1, where a choke coil is provided between a current inverting means and a parallel circuit of a load and a capacitor.

Claim 5

(5) A power apparatus described in accordance with the claim 1, where the current inverting means is a bridge inverter, which is provided with a means for driving the above described switch element so that the inverter may be inverted with a frequency lower than a frequency of the pulse to be outputted by the above described pulse power supply with the diodes being connected in opposite parallel to a pair of switch elements connected with the positive output side or the negative output side of the pulse power supply at least from among the switch elements for composing the bridge inverter.

Claim 6

(6) A power apparatus described in accordance with the claim 1, where the current inverting means is provided with a first switch element connected with the output end of the pulse power supply through a parallel circuit of the load and the capacitor, and a series circuit with respect to a first choke coil, a second switch element to be connected with the output end of the above described pulse power supply through a second choke coil, a means which is adapted to form a first closed loop circuit that flows into the load the accumulation energies of the above described first choke coil when the pulse of the above described pulse power supply is off, the above described first switch element is on, the above described second switch element is off, to form a second closed loop circuit that flows into the load the accumulation energies of the above described choke coil when the pulse of the above described pulse power supply is off, the above described first switch element is off, the above described second switch element is off so as to drive the above described first switch element and second switch element for alternately turning on, off with a frequency lower than the frequency of the pulse outputted by the above described pulse power supply.

Claim 7

(7) A power apparatus described in accordance with the claim 1, where the pulse power supply is provided with a reference output terminal, a pair of positive output terminal, negative output terminal for outputting the positive pulses, the negative pulses, a current inverting means is provided with two switch elements connected between the positive output terminal and the negative output terminal, with a parallel circuit of the load and the capacitor being connected between the reference output terminal and the connection point of the two switch elements, the above described current inverting means is provided with a means for driving the above described two switch elements so as to alternately turn on, off with a frequency lower than the frequency of the pulse to be outputted by the pulse power supply.

Claim 8

(8) A power apparatus described in accordance with the claim 1, where the pulse power supply is provided with a primary winding with the center tap being connected with one end of the above described direct current power supply, a pair of switching elements which are connected between the other end of the above described alternating current power supply and both the ends of the primary winding of the above described transformer so as to alternately effect the intermittent high frequency switching operation, a series circuit of the switch circuit and the load to prevent the voltage from being caused in the secondary winding of the transformer when one of the above described switching elements has been turned on in accordance with the control signal with the secondary winding of the above described transformer being connected, to flow the energies in the opposite direction, when the magnetic energies are accumulated in the transformer to twitch off, to effect the positive, negative inverting operation of the flowing direction in accordance with the replacement of the intermittent frequency switching operation, the alternating current of a frequency lower than the high frequency switching frequency is adapted to flow by the alternate operation of the intermittent high frequency switching action of the switching element.

Claim 9

(9) A power apparatus described in accordance with the claim 1, where the current inverting means is provided with a control circuit for outputting an inverting signal when the pulse output of the pulse power supply is not provided or is small.

Claim 10

(10) A power apparatus comprising a direct current power supply provided with a reference output terminal, a pair of positive output terminal, negative output terminal for outputting the positive voltage, the negative voltage, a current inverting means provided with two switch elements connected between the positive output terminal and the negative output terminal, a series circuit of a parallel circuit of the load and the capacitor connected between the reference output terminal and the connection point of two switch elements, and a first choke coil, the above described current inverting means is provided with a means for driving the two switch elements so that one of two switch elements may be turned off, the other is put into the high frequency switching operation, and the switching operation may be alternately effected at a long period.

Claim 11

(11) A power apparatus comprising a direct current power supply, an inverter connected with the output of the direct current power supply, a rectifying circuit having positive, negative rectification outputting circuit with the output of the inverter being connected, a switch element for stopping one of the positive, negative outputs with the control signal with the positive, negative output terminals being reversibly connected with respect to each other, a means for driving the above described switch element so that the current flowing to the load by the control signal may be inverted with a frequency lower than the oscillation frequency of the above described inverter.

Claim 12

(12) A power apparatus described in accordance with the claim 11, where the rectifying circuit is respectively a unit of positive, negative half-wave N times voltage rectifying circuits for the positive, the negative, a semiconductor switch element is connected in series with the diode of the rectifying circuit.

Claim 13

(13) A power apparatus described in accordance with the claim 12, where the load is a discharge lamp, with the inversion frequency of the current inverting means is made a frequency lower than the maximum frequency where the discharge lamp does not cause the acoustic resonance phenomenon.

Claim 14

(14) A power apparatus described in accordance with the claim 13, where a lamp voltage detecting means, a frequency control means which is adapted to vary the frequency of the alternating current flowing into the discharging lamp in accordance with the output of the above described lamp voltage detecting means are provided, the discharge lamp is connected with the current inverting means through inductances such as choke coil, transformer and so on, the frequency of the alternating current flowing to the discharge lamp is made higher when the lamp voltage is low so as to raise the impedance of the above described choke coil.

Claim 15

(15) A power apparatus described in accordance with the claim 14, where a current control means is provided with a sine wave signal circuit so as to effect the current control operation, synchronizing with the frequency of the current inverting means so that the alternating current output current may become the sine wave.