Power source using high-frequency phase control

• US 4,772,994 A
• Filed: 09/10/1987
• Issued: 09/20/1988
• Est. Priority Date: 09/10/1987
• Status: Expired due to Term

• Current Assignee: Nishimu Electronics Industries Co. Ltd. (Kyushu Electric Power Company Incorporated)
• Original Assignee: Nishimu Electronics Industries Co. Ltd. (Kyushu Electric Power Company Incorporated)
• Inventors: Shoyama, Masahito, Sakamoto, Hiroshi, Harada, Koosuke
• Primary Examiner(s): Beha, Jr., William H.
• Application Number:
  US07/095,322
• Time in Patent Office: 376 Days
• Field of Search: 363/8, 363/17, 363/24-26, 363/159, 363/160, 363/164, 363/165
• US Class Current: 363/8
• CPC Class Codes: H02M 7/4807 having a high frequency intermediate AC stage
• CPC Class Codes: H02M 7/53806 in a push-pull configuration of the parallel type

Abstract

A power source using high-frequency phase control possessing an ability to cause the transfer of electric power between a power source side and a load side to be made through a high-frequency transformer and to effect control of the output voltage by subjecting the power source side and the load side circuits to on-off control with a certain phase difference. This power source can be used as an uninterruptible power source, a device for controlled drive of a motor, a DC constant-voltage power source, or a constant-current device, for example.

Claims

1. A power source of the type using a high-frequency phase control, which comprises:

a high-frequency transformer having a primary winding and a secondary winding,

first and second switch means each connected at one terminal thereof to the opposite terminals of the primary winding of said high-frequency transformer and each connected at the other terminal thereof to the other, with the common point of connection of said first and second switching means being adapted for connection to a constant polarity source of voltage, and with there being a center tap in said primary winding of said high-frequency transformer adapted for connection to a reference source of voltage,

third and fourth switch means each connected at one terminal thereof to the opposite terminals of the secondary winding of said high-frequency transformer and each connected at the other terminal thereof to the other,

a reactor connected between the common point of connection of said third and fourth switch means and one of a pair of output terminals,

a center tap of said secondary winding of said high-frequency transformer connected to the other of the pair of output terminals,

a controlling device for effecting ON-OFF switching control alternately of said first and second switch means and, at the same time, effecting ON-OFF switching control alternately of said third and fourth switch means with a selected phase difference with reference to the switching of said first and second switch means, said controlling device comprising;

an error amplifier for generating a deviation signal representing any deviation from a reference signal of any output voltage appearing between said pair of output terminals,

a flipflop for generating a first rectangular wave controlling signal possessing an amply high frequency as compared with the frequency of said reference signal and exhibiting a duty ratio of 1/2, and a secondd rectangular wave controlling signal of a reverse phase relative to the phase of said first rectangular wave controlling signal,

means for generating a triangular wave signal which is synchronized to the first and second rectangular wave controlling signals,

a comparator for comparing the triangular wave and the deviation signal to generate a preliminary rectangular wave signal in response to the difference in their amplitude with a duty ratio depending on the amount of this difference,

a logic circuit being supplied with the preliminary rectangular wave signal and one of the first and second rectangular wave controlling signals to provide third and fourth rectangular wave controlling signals of opposite phase and with a phase differing from that of the first and second rectangular wave controlling signal depending on the duty ratio of the preliminary rectangular signal, and

means for effecting ON-OFF control of said first through fourth switch means in accordance with said first through fourth rectangular wave controlling signals.

2. A power source using high-frequency phase control according to claim 1, wherein a capacitor is connected between the pair of output terminals.

3. A power source using high-frequency phase control according to claim 1, wherein said logic circuit performs an EXCLUSIVE OR logic function.

4. A power source of the type using a high-frequency phase control, which comprises:

a high-frequency transformer having a primary winding and a secondary winding,

first and second switch means each connected at one terminal thereof to the other to be in series, the other terminal of the first switch means being adapted for connection to a first constant polarity source of voltage, and the other terminal of the second switch means being adapted for connection to a second constant polarity source of voltage with the primary winding of said high-frequency transformer having a first terminal connected between the common points of connection of the first and second switch means and a second terminal adapted for connection to a reference voltage,

third and fouth switch means each connected at one terminal thereof to the opposite terminals of the secondary winding of said high-frequency transformer and each connected at the other termninal thereof to the other,

a reactor connected between the common point of connection of said third and fourth switch means and one of a pair of output terminals,

a center tap of the second winding of said high-frequency transformer being connected to the other of the pair of output terminals,

a controlling device for effecting ON-OFF switching control alternately of said first and second switch means and, at the same time, effecting ON-OFF switching control alternately of said third and fourth switch means with a selected phase difference with reference to the switching of said first and second switch means, said controlling device comprising;

an error amplifier for generating a deviation signal representing any deviation from a reference signal of any output voltage appearing between said pair of output terminals,

a flipflop for generating a first rectangular wave controlling signal possessing an amply high frequency as compared with the frequency of said reference signal and exhibiting a duty ratio of 1/2, and a second rectangular wave controlling signal of a reverse phase relative to the phase of said first rectangular wave controlling signal,

means for generating a triangular wave signal which is synchronized to the first and second rectangular wave controlling signals,

a comparator for comparing the triangular wave and the deviation signal to generate a preliminary rectangular wave signal in response to the difference in their amplitude with a duty ratio depending on the amount of this difference,

a logic circuit being supplied with the preliminary rectangular wave signal and one of the first and second rectangular wave controlling signals to provide third and fourth rectangular wave controlling signals of opposite phase and with a phase differing from that of the first and second rectangular wave controlling signal depending on the duty ratio of the preliminary rectangular signal, and

means for effecting ON-OFF control of said first through fourth switch means in accordance with said first through fourth rectangular wave controlling signals.

5. A power source using high-frequency phase control according to claim 4, wherein a capacitor is connected between the pair of output terminals.

6. A power source using high-frequency phase control according to claim 4, wherein said logic circuit performs an EXCLUSIVE OR logic function.