WO2015102384A1

WO2015102384A1 - Z-source circuit apparatus

Info

Publication number: WO2015102384A1
Application number: PCT/KR2014/013068
Authority: WO
Inventors: 김병철; 진상용
Original assignee: 주식회사 효성
Priority date: 2013-12-31
Filing date: 2014-12-30
Publication date: 2015-07-09
Also published as: KR101522414B1

Abstract

The present invention relates to a Z-source circuit apparatus allowing bidirectional input and output, the Z-source circuit apparatus comprising: a bridge diode circuit; a first LC circuit connected to the bridge diode circuit; a second LC circuit connected to the bridge diode circuit so as to be arranged in parallel to the first LC circuit; and a switch circuit, connected in parallel to the first LC circuit and the second LC circuit, for opening and closing the bidirectionally entering and exiting current by means of the bridge diode, the first LC circuit and the second LC circuit.

Description

Z-source circuitry

The present invention relates to a Z-source circuit device, and more particularly to a Z-source circuit device capable of input and output in both directions.

Z-source circuitry consists of inductors and capacitors, and is applied to power conversion technologies such as direct current (DC) power supplies or power supplies for motor control. Korean Patent No. 1192535 discloses a technology in which a Z-source circuit device is applied.

Korean Patent No. 1192535 relates to a system and method for converting an AC input voltage into a regulated direct current (DC) output voltage using a U-type converter having a rectifying switch. The Z (G) -source converter disclosed in Korean Patent No. 1192535 includes a first inductance, a second inductance, a first rectifying switch, a second rectifying switch, a capacitance, and a load device.

The first inductance is coupled between the first and second nodes, and the second inductance is coupled between the third and fourth nodes. The first rectifying switch is coupled between the second and fourth nodes, and the second rectifying switch is coupled between the first and third nodes. The capacitance is coupled between the second and third nodes, and the load device is coupled in series with one of the first inductance and the first rectifier switch to develop a direct current (DC) output voltage.

Like the Z-type converter disclosed in Korean Patent No. 1192535, a conventional Z-source circuit device has a problem that is applied only to a current flowing from an input terminal to an output terminal, that is, a current flowing in one direction.

An object of the present invention is to solve the above problems, to provide a Z-source circuit device capable of input and output in both directions.

Another object of the present invention is to provide a Z-source circuit device that can block the occurrence of a current incident in both directions.

Still another object of the present invention is to provide a Z-source circuit device capable of lowering a rated voltage of a switch by using a mechanical switch in the event of a current incident in both directions.

The Z-source circuit device of the present invention comprises: a bridge diode circuit; A first LC circuit connected to the bridge diode circuit; A second LC circuit connected with the bridge diode circuit to be disposed in parallel with the first LC circuit; A switch circuit is connected to the first LC circuit and the second LC circuit in parallel to open and close a bridge diode circuit and a current input / output in both directions to the first LC circuit and the second LC circuit.

In the Z-source circuit device of the present invention, the bridge diode circuit includes: a first diode connected to a first node to which a bidirectional input / output line is connected; A second diode connected to the first node so as to be disposed in a forward direction with the first diode; A third diode connected to a second node connected to a bidirectional input / output line so as to be disposed in a reverse direction to the second diode; And a fourth diode disposed in a forward direction with the third diode and connected to a second node to be disposed in a reverse direction with the first diode.

In the Z-source circuit arrangement of the present invention, the first LC circuit includes one inductor and one capacitor connected in series with the inductor, and the inductor is disposed between the first diode and the fourth diode of the bridge diode circuit. The capacitor is connected between the second diode and the third diode of the inductor and the bridge diode circuit and charged by the current flowing between the fourth diode and the second diode.

In the Z-source circuit arrangement of the present invention, the second LC circuit is composed of one inductor and one capacitor connected in series with the inductor, the inductor being connected between the second diode and the third diode of the bridge diode circuit. The capacitor is connected between the second diode and the third diode of the inductor and the bridge diode circuit and charged by the current flowing between the first diode and the third diode.

In the Z-source circuit device of the present invention, the switch circuit is composed of one semiconductor switch element capable of on / off control, and the semiconductor switch element is arranged so as to be disposed in parallel with the first LC circuit. It is connected between the inductor and the capacitor of the first LC circuit, and is connected between the inductor and the capacitor of the second LC circuit to be disposed in parallel with the second LC circuit.

In the Z-source circuit device of the present invention, the switch circuit is composed of one diode and one switch connected in series with the diode, and the diode is connected to the inductor of the first LC circuit so as to be disposed in parallel with the first LC circuit. A capacitor is connected between the inductor and the capacitor of the second LC circuit so as to be disposed in parallel with the second LC circuit.

In the Z-source circuit arrangement of the present invention, the switch is a mechanical switch.

The present invention Z-source circuit device has the advantage that can be input and output in both directions, there is an advantage that can be cut off in the event of the occurrence of current input and output in both directions, switch by using a mechanical switch in the event of an occurrence of current input and output in both directions There is an advantage that can lower the rated voltage of.

1 is a circuit diagram of a Z-source circuit device according to an embodiment of the present invention;

2 and 3 are circuit diagrams showing an operating state of the Z-source circuit device of the present invention shown in FIG. 1, respectively.

4 is a waveform diagram showing a voltage change across the thyristor when an accident occurs in a Z-source circuit device according to an embodiment of the present invention;

5 is a waveform diagram showing a voltage difference across the thyristor in a Z-source circuit device according to an embodiment of the present invention;

6 is a waveform diagram showing a current state when an accident occurs in the Z-source circuit device according to an embodiment of the present invention;

7 is a circuit diagram of a Z-source circuit device according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, and in describing the present invention, when it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, Detailed description will be omitted.

As shown in FIG. 1, the Z-source circuit device of the present invention is composed of a bridge diode circuit 11, a first LC (LC) circuit 12, a second LC (LC) circuit 13, and a switch circuit 14.

In the bridge diode circuit 11, a plurality of diodes D1, D2, D3, and D4 are connected to each other at a first node n1 and a second node n2 to which a bidirectional input / output line BL is connected, and a first LC circuit ( 12 is connected to the bridge diode circuit 11 to act as one Z-source circuit. The second LC circuit 13 is connected to the bridge diode circuit 11 so as to be arranged in parallel with the first LC circuit to serve as one Z-source circuit. The switch circuit 14 is connected in parallel with the first LC circuit 12 and the second LC circuit 13, respectively, and inputs and outputs in both directions to the bridge diode circuit 11, the first LC circuit 12, and the second LC circuit 13. Open and close the current.

Referring to the configuration of the Z-source circuit device of the present invention having the above configuration in detail with reference to the accompanying drawings as follows.

As shown in FIG. 1, the bridge diode circuit 11 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4.

The first diode D1 is connected to the first node n1 to which the bidirectional input / output line BL is connected, and the second diode D2 is connected to the first node n1 in a forward direction with the first diode D1. Connected. The third diode D3 is connected to the second node n2 to which the bidirectional input / output line BL is connected so as to be disposed in a reverse direction to the second diode D2 so that a current input through the first diode D1 is applied to the second node D2. Output to the bidirectional input / output line BL through (n2). The fourth diode D4 is disposed in the forward direction with the third diode D3, and is connected to the second node n2 so as to be disposed in the reverse direction with the first diode D1, and is connected to the first node n1. The current input through BL is output to the bidirectional input / output line BL connected to the second node n2 through the second diode D2.

The forward and reverse directions representing the connection relationship between the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 indicate the polarity connection states. For example, the forward connection relationship between the first diode D1 and the second diode D2 is such that an anode of the second diode D2 is connected to a cathode of the first diode D1. The reverse connection of the fourth diode D4 and the first diode D1 indicates a state in which the anode of the fourth diode D4 is connected to the anode of the first diode D1.

The first LC circuit 12 and the second LC circuit 13 consist of one capacitor C connected in series with one inductor L, respectively, as shown in FIG. 1. The 2LC circuit 13 and the bridge diode circuit 11 are connected to each other to form one Z-source circuit.

First, the first LC circuit 12 is connected between the first node n1 and the second node n2 and receives a current input through the bidirectional input / output line BL connected to the first node n1. D1), the switch circuit 14 and the third diode (D3) through the bi-directional input / output line (BL) connected to the second node (n2) without loss output.

The inductor L of the first LC circuit 12, which inputs and outputs current from the first node n1 to the second node n2 without losing current, is connected to the first diode D1 and the fourth diode of the bridge diode circuit 11. It is connected between the diode D4. The capacitor C is connected between the second diode D2 and the third diode D3 of the inductor L and the bridge diode circuit 11 to connect the fourth diode D4 and the second diode D2. It is charged by flowing current.

Looking at the connection relationship between the inductor L and the capacitor C of the first LC circuit 12 in detail, a third end of the inductor L is connected between the first diode D1 and the fourth diode D4. It is connected to the node n3, and the other end is connected to the switch SW of the switch circuit (14). One end of the capacitor C is connected between the inductor L and the switch SW, and the other end of the capacitor C is connected to the sixth node n6 connected between the second diode D2 and the third diode D3. It is connected in series with (L).

In addition, the second LC circuit 13 is connected between the second node n2 and the first node n1 to receive a current input through the bidirectional input / output line BL connected to the second node n2. D4), the switch circuit 14 and the second diode (D2) outputs without loss to the bi-directional input / output line (BL) connected to the first node (n1).

The inductor L of the second LC circuit 13 is connected between the second diode D2 and the third diode D3 of the bridge diode circuit 11, and the capacitor C is connected to the inductor L and the bridge diode circuit. It is connected between the second diode D2 and the third diode D3 of (11) and is charged by the current flowing between the first diode D1 and the third diode D3.

Looking at the connection relationship between the inductor L and the capacitor C of the second LC circuit 13 in detail, the inductor L has a first end connected between the second diode D2 and the third diode D3. It is connected to four nodes (n4), the other end is connected to the diode (D5) of the switch circuit (14). One end of the capacitor C is connected between the inductor L and the diode D5, and the other end is connected to the fifth node n5 connected between the fourth diode D4 and the first diode D1. It is connected in series with (L).

The switch circuit 14 is composed of one semiconductor switch element 14 as shown in FIG. The semiconductor switch element 14 may be implemented as a thyristor (THR) as a semiconductor element that can be turned on / off. As shown in the drawing, the thyristor THR is opened when a fault current occurs due to a short circuit in the bidirectional input / output line BL connected to the first node n1 or the second node n2 to block the flow of current. do. In addition, the thyristor THR is connected in series with each inductor L of the first LC circuit 12 and the second LC circuit 13 and connected in parallel with each capacitor C, so that the first LC circuit 12 Is connected between the inductor L and the capacitor C, and is connected between the inductor L and the capacitor C of the second LC circuit 13.

Referring to the operation of the Z-source circuit device of the present invention having the above configuration is as follows.

In the Z-source circuit device of the present invention, the bridge diode circuit 11 is applied such that current is inputted and outputted in both directions through the bidirectional input / output line BL connected to the first node n1 and the second node n2, respectively. The diode circuit 11 has two current path circuits, and the two current path circuits comprise a first current path circuit and a second current path circuit.

The first current pass circuit includes the first diode D1, the first LC circuit 12, the switch circuit 14, and the second LC circuit 13 of the bridge diode circuit 11, as shown by the thick line shown in FIG. 2. ) And the third diode D3 of the bridge diode circuit 11. The first diode D1 and the third diode D3 are connected to each other in a forward direction when viewed from the first current pass circuit, and are arranged such that current flows from the first node n1 to the second node n2. The first LC circuit 12 and the second LC circuit 13 are connected in parallel when viewed from the first current pass circuit, respectively, and the switch circuit 14 is connected in series.

In the state in which current is input through the bidirectional input / output line BL connected to the first node n1 connected to the first current path circuit, as shown in FIG. 2, the current flows through the thyristor THR of the switch circuit 14. Current pass circuit, i.e., the first diode D1 of the bridge diode circuit 11, the first LC circuit 12, the switch circuit 14, the second LC circuit 13, and the third diode of the bridge diode circuit 11. It is output through the bidirectional I / O line BL connected to the second node n2 through D3.

As shown by the thick line shown in FIG. 3, the second current pass circuit includes the fourth diode D4, the first LC circuit 12, the switch circuit 14, and the second LC circuit 13 of the bridge diode circuit 11. ) And the second diode D2 of the bridge diode circuit 11. The second diode D2 and the fourth diode D4 are connected to each other in a forward direction when viewed from the second current pass circuit, and are arranged such that current flows from the second node n2 to the first node n1. As described above, the first LC circuit 12, the second LC circuit 13, and the switch circuit 14 are connected in parallel when viewed from the second current pass circuit.

As the current is input through the bi-directional input / output line BL connected to the second node n2 connected to the second current path circuit, the current is discharged through the thyristor THR of the switch circuit 14 as shown in FIG. 3. Through a bi-directional input / output line BL connected to the first node n1 through the fourth diode D4, the first LC circuit 12, the switch circuit 14, the second LC circuit 13, and the second diode D2. Is output.

When current is normally inputted and outputted in both directions through the first current path circuit and the second current path circuit, the current indicates a state such as a high section of the waveform shown in FIG. 6 through the thyristor THR. In this state, when a fault current occurs due to a short circuit in the bidirectional input / output line BL connected to the first node n1 or the second node n2, a voltage as shown in FIG. 4 is formed at both ends of the switch circuit 14. As a result, a reverse voltage as shown in FIG. 5 is formed at both ends of the switch circuit 14 to block the flow of current. In order to block the fault current, the current flowing in both directions through the thyristor (THR) of the switch circuit 14 is cut off.

When the thyristor THR is on, the current flowing through the thyristor THR should move from the high section to the zero section as shown in the waveform indicated by the thick line shown in FIG. . When a fault current is generated due to a short-circuit accident, which is not a normal operation, a reverse voltage as shown in FIG. 5 is generated at both ends of the thyristor THR, and the thyristor is naturally turned off by the reverse voltage, and the current is blocked. This can be confirmed from the experimental results of FIG. 4. 4 is a waveform diagram illustrating a voltage change at both ends of a thyristor THR when an accident occurs. A portion 'A' shown in FIG. 5 represents a waveform diagram in which voltages at both ends of the thyristor THR are reversed due to an accident. Here, in the waveform diagrams shown in Figs. 4 to 6, respectively, the horizontal axis represents the amount of current, and the vertical axis represents time.

When the current of the switch SW to which the mechanical switch is applied becomes zero, it is possible to prevent the arc from occurring when opening, thereby preventing the reverse current due to a short circuit accident. As described above, the Z-source circuit device of the present invention allows the current flowing in both directions to be safely cut off when a fault current is generated in the bidirectional input / output line BL connected to the first node n1 or the second node n2. Z-source circuitry can be used safely and reliably.

Referring to FIG. 7, the Z-source circuit device according to the embodiment of the present invention differs only in the configuration of the switch circuit 14 when compared to the Z-source circuit device according to the embodiment of the present invention shown in FIG. 1. There is, the other configuration is the same. That is, in one embodiment of the present invention shown in FIG. 1, the switch circuit 14 is composed of, for example, a thyristor (THR) as a semiconductor switch element, but a switch in a Z-source circuit device according to another embodiment of the present invention. The circuit 14 comprises one diode D5 and one switch SW connected in series with the diode D5. The diode D5 and the switch SW are also opened when a fault current occurs due to a short circuit in the bidirectional input / output line BL connected to the first node n1 or the second node n2, and thus the current flows. Block it.

Hereinafter, the configuration and operation of the Z-source circuit device according to another embodiment of the present invention. First, the diode D5 of the switch circuit 14 which blocks the flow of current when a fault current is generated is arranged in parallel with the first LC circuit 12 so that the diode D5 is connected to the inductor L of the first LC circuit 12. It is connected between the capacitor (C), the switch (SW) is connected between the inductor (L) and the capacitor (C) of the second LC circuit 13 to be arranged in parallel with the second LC circuit (13). In particular, the connection relationship between the switch circuit 14 will be described in more detail. In the diode D5, the cathode is connected to the inductor L of the first LC circuit 12, and the anode is the contact terminal T1 of the switch SW. Is connected to. In the switch SW, the contact terminal T1 is connected to the inductor L, and the switching terminal T2 is connected between the inductor L and the capacitor C of the second LC circuit 13. Such a switch (SW) is a mechanical switch is used to reduce the rated voltage.

Also in this configuration, it has two current path circuits through the bridge diode circuit 11 so that current is inputted and outputted in both directions through the bidirectional input / output lines BL connected to the first node n1 and the second node n2, respectively. The two current path circuits consist of a first current path circuit and a second current path circuit.

The first current path circuit has the same principle as that of FIG. 2, and the first diode D1, the first LC circuit 12, the switch circuit 14, the second LC circuit 13, and the bridge diode circuit of the bridge diode circuit 11 ( 11) of the third diode D3. The first diode D1 and the third diode D3 are connected to each other in a forward direction when viewed from the first current pass circuit, and are arranged such that current flows from the first node n1 to the second node n2. The first LC circuit 12 and the second LC circuit 13 are connected in parallel when viewed from the first current pass circuit, respectively, and the switch circuit 14 is connected in series.

If the switch SW of the switch circuit 14 is closed while the current is input through the bidirectional input / output line BL connected to the first node n1 connected to the first current path circuit, the current is one current path circuit. That is, the first diode D1 of the bridge diode circuit 11, the first LC circuit 12, the switch circuit 14, the second LC circuit 13, and the third diode D3 of the bridge diode circuit 11 are connected. It is output through the bi-directional input and output line (BL) connected to the second node (n2) through.

The second current path circuit has the same principle as that of FIG. 3, and the fourth diode D4, the first LC circuit 12, the switch circuit 14, the second LC circuit 13, and the bridge diode circuit of the bridge diode circuit 11 are performed. It consists of the 2nd diode D2 of (11). The second diode D2 and the fourth diode D4 are connected to each other in a forward direction when viewed from the second current pass circuit, and are arranged such that current flows from the second node n2 to the first node n1. As described above, the first LC circuit 12, the second LC circuit 13, and the switch circuit 14 are connected in parallel when viewed from the second current pass circuit.

If the switch SW of the switch circuit 14 is closed while the current is input through the bidirectional input / output line BL connected to the second node n2 connected to the second current path circuit, the current is the fourth diode D4. ), The first LC circuit 12, the switch circuit 14, the second LC circuit 13, and the second diode D2 are output through the bidirectional input / output line BL connected to the first node n1.

4 and 6, the waveform diagrams of the voltage change, the voltage difference, and the current state of both ends of the switch circuit 14 are the same.

As described above, the Z-source circuit device of the present invention is capable of inputting and outputting in both directions, blocking the occurrence of current input and output in both directions, and using a predetermined switch circuit when an occurrence of current input and output in both directions occurs. The rated voltage can be lowered.

Although the present invention described above has been described in detail through the preferred embodiments, the present invention is not limited to the content of these embodiments. Those skilled in the art to which the present invention pertains, although not shown in the embodiments, can be imitated or improved for various inventions within the scope of the appended claims, all of which fall within the technical scope of the present invention. Belonging will be too self-evident. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims

A bridge diode circuit;

A first LC circuit connected to the bridge diode circuit;

A second LC circuit connected with the bridge diode circuit to be disposed in parallel with the first LC circuit;

Z (G) -source, characterized in that composed of a switch circuit connected in parallel with the first LC circuit and the second LC circuit, respectively, to open and close currents input and output in both directions to the bridge diode circuit and the first LC circuit and the second LC circuit. Circuitry.
The method of claim 1, wherein the bridge diode circuit,

A first diode connected to a first node to which a bidirectional input / output line is connected;

A second diode connected to the first node so as to be disposed in a forward direction with the first diode;

A third diode connected to a second node connected to a bidirectional input / output line so as to be disposed in a reverse direction to the second diode;

And a fourth diode disposed in a forward direction with the third diode and connected to a second node to be disposed in a reverse direction with the first diode.
The method of claim 1, wherein the first LC circuit,

One inductor and one capacitor connected in series with the inductor,

The inductor is connected between the first diode and the fourth diode of the bridge diode circuit, and the capacitor is connected between the second diode and the third diode of the inductor and the bridge diode circuit and flows between the fourth diode and the second diode. Z-source circuitry, characterized in that the charge by the current.
The method of claim 1, wherein the second LC circuit,

One inductor and one capacitor connected in series with the inductor,

The inductor is connected between the second diode and the third diode of the bridge diode circuit, and the capacitor is connected between the second diode and the third diode of the inductor and the bridge diode circuit and flows between the first diode and the third diode. Z-source circuitry, characterized in that the charge by the current.
The method of claim 1, wherein the switch circuit,

Consists of one semiconductor switch element capable of on / off control,

The semiconductor switch element is connected between the inductor and the capacitor of the first LC circuit to be arranged in parallel with the first LC circuit, and is connected between the inductor and the capacitor of the second LC circuit to be arranged in parallel with the second LC circuit. Z-source circuitry.
The method of claim 1, wherein the switch circuit,

It consists of one diode and one switch connected in series with the diode,

The diode is connected between the inductor and the capacitor of the first LC circuit to be arranged in parallel with the first LC circuit, the switch is connected between the inductor and the capacitor of the second LC circuit to be arranged in parallel with the second LC circuit. Z-source circuitry.
7. The Z-source circuit arrangement according to claim 6, wherein the switch is a mechanical switch.