KR200212794Y1 - An apparatus for controlling of asymetric bipolar output using a single power source - Google Patents

Abstract

The present invention relates to an asymmetric bipolar output control device, in particular characterized by using a single power supply, a negative main power supply including a single input transformer and rectifier, and connected to the negative main power supply and the first A positive main power supply unit including a chopper and a capacitor for charging a voltage by the first chopper, and a second chopper and a diode for selecting and outputting the negative main power supply unit and the positive main power supply unit. And an output inverter unit including four choppers to obtain an asymmetric bipolar output in combination with the power source selected by the power source selector.

The asymmetric bipolar output control device using a single power supply according to the present invention can greatly improve the size and stability of the system by eliminating the main overlapping portion of the circuit for the same capacity.

Description

An apparatus for controlling of asymetric bipolar output using a single power source}

The present invention relates to an asymmetric bipolar output control device, in particular characterized by using a single power supply. In general, an Asymetric bipolar power converter having a single power supply is configured as shown in FIG. 1.

An asymmetric bipolar power supply is a power supply that outputs a positive and negative voltage at a certain duty ratio within a predetermined frequency, and the duty ratio may vary.

1 is a conventional general asymmetric bipolar power converter, which uses two power supplies to produce outputs of different sizes. However, in the case of using a dual power supply in this way, the capacity of both power supplies is very inefficient since both must be designed for the maximum flow rate. In addition, the breakdown voltage rating of the semiconductor device used as the switching element is the sum of the voltage values by the two power supply devices, the device having a higher breakdown voltage than the device used for the actual output voltage is required.

Accordingly, an object of the present invention is to provide an asymmetric bipolar output control device having a single power supply having a simpler system configuration and easier design than a conventional asymmetric bipolar output control device while solving the problems of the prior art.

1 is a circuit diagram of a conventional asymmetric bipolar output control device.

2A and 2B are circuit diagrams of an asymmetric bipolar output control apparatus using a single power supply according to the present invention.

Asymmetric bipolar output control apparatus using a single power supply according to the present invention for achieving the above object has the following components.

That is, a negative main power supply including one input transformer and a rectifier,

A positive main power supply connected to said negative main power supply and including a first chopper and a capacitor for charging voltage by said first chopper,

A power selector including a second chopper and a diode to select and output the negative main power supply and the positive main power supply;

And an output inverter comprising four choppers to obtain an asymmetric bipolar output in combination with the power selected by the power selector.

Preferably, the first chopper of the positive main power supply unit is connected in series with one diode and connected in parallel with the capacitor through a coil.

In addition, it is preferable that the second chopper and the diode of the power selector are connected in parallel with each other, the diode and the capacitor of the positive main power supply are connected in series, and the first chopper and the second chopper are connected in parallel with each other.

In addition, in the chopper of the output inverter unit, two choppers third and fourth choppers and fifth and sixth choppers are connected in series with each other, and a resistor and a coil connected in series between the third and fourth choppers and the fifth and sixth choppers. It is preferable to be connected in parallel via.

In addition, the positive main power supply unit is a first chopper is connected in series with one diode and in parallel with the capacitor through a coil,

The second chopper and the diode of the power selector are connected in parallel to each other, the diode and the capacitor of the positive main power supply are connected in series, the first chopper and the second chopper are connected in parallel to each other,

In the chopper of the output inverter unit, two choppers third and fourth choppers and fifth and sixth choppers are connected in series with each other, and a resistor and a coil connected in series between the third and fourth choppers and the fifth and sixth choppers. It is preferable to be connected in parallel.

More preferably, when a large amount of positive voltage is to be output, the second, third and sixth choppers of the power selector are simultaneously turned on.

In order to output a large negative voltage, the second, fourth and fifth choppers of the power selector are simultaneously turned on.

In order to output a small positive voltage, the second chopper of the power selector is turned off and the third and six choppers are turned on at the same time.

When it is desired to output a small negative voltage, it is preferable to turn off the second chopper of the power supply selector and to turn on the fourth and fifth choppers at the same time.

1 is a circuit diagram of a conventional asymmetric bipolar output control device, Figures 2a and 2b is a circuit diagram of an asymmetric bipolar output control device using a single power supply according to the present invention.

Hereinafter, the operation principle of the asymmetric bipolar output control apparatus using a single power supply according to the present invention will be described.

First, the negative main power is used as the rectifier output voltage, and two power sources for the bipolar output are configured by charging a voltage to the capacitor C30 using the first chopper Q14 to generate a positive voltage. The voltage charged in the capacitor can be controlled.

The two powers are sequentially supplied to the DC-link of the output inverter by the second chopper Q13 and the diode D43.

In this case, when a large voltage is to be supplied from the output inverter, the second chopper is turned on to supply the input voltage of the output inverter at a high voltage. At this time, the low voltage source does not work by the diode D43.

In the case of supplying a low voltage as an output voltage, when the second chopper is turned off, a low voltage is applied to the output voltage through the diode D43 in front of the inverter, so that a low voltage appears in the output voltage.

For asymmetric bipolar operation, the second chopper Q13 and the switching of the choppers Q11, Q12, Q7 and Q8 are appropriately combined.

First, to apply a small voltage with a positive voltage and a large voltage with a negative voltage, turn on Q7 and Q12 with the chopper Q13 turned on, and turn on Q11 and Q8 with the chopper Q13 turned off.

Next, to apply a large voltage and a negative voltage with a positive voltage, turn on Q7 and Q12 with the chopper Q13 turned off, and turn on Q11 and Q8 with the chopper Q13 turned on.

Asymmetric bipolar power supply using a single power supply according to the present invention has the following effects.

First, in the asymmetric bipolar power supply using a single power supply according to the present invention, even if the positive power duty is almost 100% or the negative duty is almost 100%, the rating of the input transformer is negative. Same as the transformer for the supply key. In addition, since the output power when combined with the positive duty is always smaller than when the negative duty is set to 100%, the input transformer always operates stably, and the capacity design is easy. Therefore, the asymmetric bipolar power supply circuit device using a single power supply according to the present invention can remove one set of the high frequency transformer and the rectifier unit compared to the existing circuit device.

Second, the rating of the semiconductor device only needs to withstand the DC link voltage for controlling the negative output voltage. Therefore, it is advantageous in terms of semiconductor selection and price. In addition, by making it possible to use a small withstand voltage of the semiconductor it makes the system very stable electrically. In general, when the breakdown voltage is high, a large amount of arm short current flows due to a large amount of reverse blocking charge of the semiconductor.

Third, the conventional circuit is fixed in negative voltage and positive voltage, and it is difficult to generate free-wheeling mode, whereas the present circuit is Q11-Q8, Q7 for ON / OFF of the second chopper Q13. It is free to increase the negative voltage or increase the positive voltage by changing the combination of Q12 or Q7-Q12 and Q11-Q8. Of course, even in this case, the input stage transformers have to be designed and manufactured to have the maximum capacity in order to use the conventional technology as described above. That is, it is only necessary to always supply the maximum capacity with one input stage transformer.

In conclusion, the asymmetric bipolar output control device using a single power supply according to the present invention can greatly improve the size and stability of the system by eliminating the main redundant components of the circuit for the same capacity.

Claims (6)

A negative main power supply including one input transformer and a rectifier; A positive main power supply connected to said negative main power supply, said positive main power supply including a first chopper and a capacitor for charging a voltage by said first chopper; A power selector including a second chopper and a diode to select and output the negative main power supply and the positive main power supply; And an output inverter section including four choppers to obtain an asymmetric bipolar output in combination with the power source selected by the power source selection section. An asymmetric bipolar output control device using a single power supply. The asymmetric bipolar output control using a single power supply according to claim 1, wherein the first chopper of the positive main power supply is connected in series with one diode and connected in parallel with the capacitor through a coil. Device. 2. The method of claim 1, wherein the second chopper and the diode of the power selector are connected in parallel to each other, the diode and the capacitor of the positive main power supply are connected in series, and the first chopper and the second chopper are connected in parallel to each other. Asymmetric bipolar output controller using a single power supply. The chopper of claim 1, wherein the chopper of the output inverter unit has two choppers, third and fourth choppers, and fifth and sixth choppers connected in series with each other, and between the third and fourth choppers and the fifth and sixth choppers. An asymmetric bipolar output control using a single power supply, characterized in that it is connected in parallel via a series connected resistor and coil. The positive main power supply of claim 1, wherein the positive main power supply unit has a first chopper connected in series with one diode and connected in parallel with the capacitor through a coil. The second chopper and the diode of the power selector are connected in parallel to each other, the diode and the capacitor of the positive main power supply are connected in series, the first chopper and the second chopper are connected in parallel to each other, In the chopper of the output inverter unit, two choppers third and fourth choppers and fifth and sixth choppers are connected in series with each other, and a resistor and a coil connected in series between the third and fourth choppers and the fifth and sixth choppers. An asymmetric bipolar output control device using a single power supply, characterized in that connected via parallel. 6. The method of claim 5, wherein the second and third and sixth choppers of the power supply selection unit are simultaneously turned on when a large positive voltage is to be output. In order to output a large negative voltage, the second, fourth and fifth choppers of the power selector are simultaneously turned on. In order to output a small positive voltage, the second chopper of the power selector is turned off and the third and six choppers are turned on at the same time. When a small negative voltage is to be output, the second chopper of the power selector is turned off and the fourth and fifth choppers are turned on at the same time. Asymmetric bipolar output control.