KR102616665B1 - Phase Shift Full Bridge Converter And Method Of Driving The Same - Google Patents

Abstract

The present invention includes first and second input switches connected in series between a high potential terminal and a low potential terminal of an input voltage; third and fourth input switches connected in series between the high potential terminal and the low potential terminal of the input voltage; a first transformer connected to the first to fourth input switches; a magnetized inductor connected to the primary side of the first transformer; first and second diodes connected to the secondary side of the first transformer; a second transformer connected to the first and second diodes; first and second output inductors respectively connected to the primary and secondary sides of the second transformer; first and second output switches connected in series between the primary side and the secondary side of the second transformer; It includes an output capacitor and an output resistor connected in parallel to the first and second output switches, and a first input section in which the first input switch is turned on and a fourth input in which the fourth input switch is turned on. The sections are the same, and the second input section in which the second input switch is turned on and the third input section in which the third input switch is turned on are the same, and the first output switch is turned on. The first output section overlaps the first and second input sections, and the second output section where the second output switch is turned on overlaps the first and second input sections. A combined inductor rectifier phase shift full bridge A converter is provided.

Description

Phase Shift Full Bridge Converter And Method Of Driving The Same}

The present invention relates to a phase-shift full-bridge converter, and in particular, to a phase-shift full-bridge converter and a method of driving the same, in which the voltage stress of the diode on the secondary side of the transformer is reduced by boost driving the secondary side of the transformer.

Phase shift full bridge converters are used in a variety of applications, including server power supplies for network and telecommunication servers, chargers for charging electric vehicles, and drivers for driving light-emitting diodes.

Among these phase-shifted full-bridge converters, the coupled inductor rectifier phase-shifted full-bridge converter has the advantage of having high efficiency due to low circulating current and the two switches on the rectifier side having low voltage stress. .

However, the combined inductor rectifier phase shift full bridge converter has a problem in that the remaining two switches on the rectifier side have high voltage stress in a wide input voltage range.

The present invention was developed to solve the above problems. By boost driving the secondary side of the transformer, the voltage stress of the diode on the secondary side of the transformer is reduced, improving efficiency and reducing manufacturing costs. A phase shift full-bridge converter and The purpose is to provide the driving method.

In addition, the present invention allows the switch on the secondary side of the transformer to have a boost duty ratio, so that the voltage stress of the switch on the secondary side of the transformer is clamped to the output voltage and at the same time, the voltage stress of the diode on the secondary side of the transformer is reduced. Another purpose is to provide a phase shift full bridge converter and a driving method thereof.

In order to achieve the above object, the present invention includes first and second input switches connected in series between a high potential terminal and a low potential terminal of an input voltage; third and fourth input switches connected in series between the high potential terminal and the low potential terminal of the input voltage; a first transformer connected to the first to fourth input switches; a magnetized inductor connected to the primary side of the first transformer; first and second diodes connected to the secondary side of the first transformer; a second transformer connected to the first and second diodes; first and second output inductors respectively connected to the primary and secondary sides of the second transformer; first and second output switches connected in series between the primary side and the secondary side of the second transformer; It includes an output capacitor and an output resistor connected in parallel to the first and second output switches, and a first input section in which the first input switch is turned on and a fourth input in which the fourth input switch is turned on. The sections are the same, and the second input section in which the second input switch is turned on and the third input section in which the third input switch is turned on are the same, and the first output switch is turned on. The first output section overlaps the first and second input sections, and the second output section where the second output switch is turned on overlaps the first and second input sections. A combined inductor rectifier phase shift full bridge A converter is provided.

And, a first boost section in which the second and third input sections and the second output section overlap with respect to the sum of the first and second output sections, or a second boost section in which the first and fourth input sections overlap. The boost duty ratio, which is a ratio of , may be 0 to 0.3.

Additionally, when the input voltage is 200V to 300V, the boost duty ratio may be 0.3 to 0.1, and when the input voltage is 300V to 400V, the boost duty ratio may be 0.1 to 0.

And, the ratio of the overlapping section of the first and fourth input sections or the overlapping section of the second and third input sections to the sum of the first and second input sections or the sum of the third and fourth input sections. The duty ratio may be 0.5.

Additionally, during the first input period, the first input switch is turned on and the second input switch is turned off, and during the second input period, the first input switch is turned off and the second input switch is turned on. is turned on, and during the third input period, the third input switch is turned on and the fourth input switch is turned off, and during the fourth input period, the third input switch is turned off and the The fourth input switch is turned on, the first output switch is turned on and the second output switch is turned off during the first output section, and the first output switch is turned on during the second output section. -off and the second output switch can be turned on.

And, the anode of the first diode is connected to the first terminal of the secondary side of the first transformer and the cathode of the second diode, and the cathode of the first diode is connected to the first terminal of the secondary side of the first transformer. terminal, connected to the first terminal of the first output inductor, and the anode of the second diode is connected to the first terminal of the secondary side of the second transformer and the first terminal of the second output inductor, and the anode of the second diode is connected to the first terminal of the secondary side of the second transformer. The cathode of the second diode may be connected to the first terminal of the secondary side of the first transformer and the anode of the first diode.

Meanwhile, the present invention includes first to fourth input switches, first and second transformers, magnetized inductors, first and second diodes, first and second output inductors, first and second output switches, output capacitors, A driving method of a combined inductor rectifier phase shift full bridge converter including an output resistance, comprising: turning on the first input switch during a first input period; turning on the second input switch during a second input section spaced from the first input section; turning on the third input switch during a third input period identical to the second input period; turning on the fourth input switch during a fourth input section that is spaced from the third input section and is the same as the first input section; turning on the first output switch during a first output section overlapping the first to fourth input sections; A driving method of a combined inductor rectifier phase shift full bridge converter comprising the step of turning on the second output switch during a second output section spaced from the first output section and overlapping the first to fourth input sections. to provide.

And, a first boost section in which the second and third input sections and the second output section overlap with respect to the sum of the first and second output sections, or a second boost section in which the first and fourth input sections overlap. The boost duty ratio, which is a ratio of , may be 0 to 0.3.

Additionally, the ratio of the overlapping section of the first and fourth input sections or the overlapping section of the second and third input sections to the sum of the first and second input sections or the sum of the third and fourth input sections. The duty ratio may be 0.5.

And, during the first input period, the first input switch is turned on and the second input switch is turned off, and during the second input period, the first input switch is turned off and the second input switch is turned on. is turned on, and during the third input period, the third input switch is turned on and the fourth input switch is turned off, and during the fourth input period, the third input switch is turned off and the The fourth input switch is turned on, the first output switch is turned on and the second output switch is turned off during the first output section, and the first output switch is turned on during the second output section. -off and the second output switch can be turned on.

In the present invention, by boost driving the secondary side of the transformer, the voltage stress of the diode on the secondary side of the transformer is reduced, thereby improving efficiency and reducing manufacturing costs.

In addition, the present invention allows the switch on the secondary side of the transformer to have a boost duty ratio, so that the voltage stress of the switch on the secondary side of the transformer is clamped to the output voltage and at the same time, the voltage stress of the diode on the secondary side of the transformer is reduced. It has the effect of being

1 is a circuit diagram showing a coupled inductor rectifier phase shift full bridge converter according to an embodiment of the present invention.
Figure 2 is a waveform diagram showing the gate signal of the coupled inductor rectifier phase shift full bridge converter according to an embodiment of the present invention.
3A and 3B are diagrams showing a build-up state and a powering state, respectively, of a coupled inductor rectifier phase shift full-bridge converter according to an embodiment of the present invention.
Figure 4 is a waveform diagram showing a gate signal of a combined inductor rectifier phase shift full bridge converter according to a comparative example.
5A, 5B, and 5C illustrate multiple waveforms of a coupled inductor rectifier phase-shift full bridge converter according to an embodiment of the present invention for input voltages of about 200V, about 300V, and about 400V, respectively.
6A, 6B, and 6C illustrate multiple waveforms of a coupled inductor rectifier phase shift full bridge converter according to a comparative example for input voltages of about 200V, about 300V, and about 400V, respectively.
Figure 7 is a diagram showing the diode voltage stress of the coupled inductor rectifier phase shift full bridge converter according to the embodiment and comparative example of the present invention.

Hereinafter, specific details of the present invention will be described in detail with reference to the attached drawings.

1 is a circuit diagram showing a coupled inductor rectifier phase shift full bridge converter according to an embodiment of the present invention.

As shown in FIG. 1, the coupled inductor rectifier phase shift full bridge converter 110 according to an embodiment of the present invention generates an output voltage (Vo) using an input voltage (Vi).

For this purpose, the combined inductor rectifier phase shift full bridge converter 110 includes first to fourth input switches (Q1 to Q4), magnetization inductor (Lm), first and second transformers (T1, T2), and Includes 1st and 2nd diodes (D1, D2), 1st and 2nd output inductors (Lo1, Lo2), 1st and 2nd output switches (S1, S2), output capacitor (Co), and output resistance (Ro). In this case, the first to fourth input switches (Q1 to Q4) and the magnetizing inductor (Lm) constitute the primary side of the first transformer (T1), the first and second diodes (D1, D2), and the first and second diodes (D1, D2) 2Output inductors (Lo1, Lo2), first and second output switches (S1, S2), output capacitor (Co), and output resistance (Ro) constitute the secondary side of the first transformer (T1).

The first to fourth input switches (Q1 to Q4) and the first and second output switches (S1, S2) may be transistors.

The first and second input switches (Q1, Q2) are connected in series between the high potential terminal and the low potential terminal of the input voltage (Vi), and the third and fourth input switches (Q3, Q4) are connected in series to the input voltage (Vi). ) is connected in series between the high potential terminal and the low potential terminal of It is connected in parallel between the terminal and the low potential terminal.

For example, the first to fourth input switches (Q1 to Q4) may be negative (n) type transistors.

The gate of the first input switch (Q1) is connected to the first input gate voltage (Gq1), and the drain of the first input switch (Q1) is connected to the high potential terminal of the input voltage (Vi) and the high potential terminal of the third input switch (Q3). It is connected to the drain, and the source of the first input switch (Q1) is connected to the drain of the second input switch (Q2), the first terminal of the magnetizing inductor (Lm), and the first terminal of the primary side of the first transformer (T1). You can.

The gate of the second input switch (Q2) is connected to the second input gate voltage (Gq2), and the drain of the second input switch (Q2) is connected to the source of the first input switch (Q1) and the first magnetization inductor (Lm). terminal, is connected to the first terminal of the primary side of the first transformer (T1), and the source of the second input switch (Q2) is connected to the low potential terminal of the input voltage (Vi), the source of the fourth input switch (Q4). You can.

The gate of the third input switch (Q3) is connected to the third input gate voltage (Gq3), and the drain of the third input switch (Q1) is connected to the high potential terminal of the input voltage (Vi) and the high potential terminal of the first input switch (Q1). It is connected to the drain, and the source of the third input switch (Q3) is connected to the drain of the fourth input switch (Q4), the second terminal of the magnetizing inductor (Lm), and the second terminal of the primary side of the first transformer (T1). You can.

The gate of the fourth input switch (Q4) is connected to the fourth input gate voltage (Gq4), and the drain of the fourth input switch (Q4) is connected to the source of the third input switch (Q3) and the second voltage of the magnetizing inductor (Lm). terminal, is connected to the second terminal of the primary side of the first transformer (T1), and the source of the fourth input switch (Q4) is connected to the low potential terminal of the input voltage (Vi), the source of the second input switch (Q2). You can.

The magnetization inductor (Lm) is connected between the first and second terminals on the primary side of the first transformer (T1) to store or output magnetic energy according to the mutual magnetic flux of the first transformer (T1), and the magnetization inductor (Lm) ), the magnetization current (Im) flows.

For example, the first terminal of the magnetizing inductor (Lm) is connected to the source of the first input switch (Q1), the drain of the second input switch (Q2), and the first terminal of the primary side of the first transformer (T1) , the second terminal of the magnetized inductor (Lm) may be connected to the source of the third input switch (Q3), the drain of the fourth input switch (Q4), and the second terminal of the primary side of the first transformer (T1).

The first transformer (T1) is connected between the first to fourth input switches (Q1 to Q4) and the first and second diodes (D1, D2), and converts the magnetization energy stored in the magnetization inductor (Lm) into transformer voltage. and output, and the leakage current (It) flows in the primary side of the first transformer (T1).

For example, the first terminal of the primary side of the first transformer (T1) is connected to the source of the first input switch (Q1), the drain of the second input switch (Q2), and the first terminal of the magnetizing inductor (Lm) , the second terminal of the primary side of the first transformer (T1) may be connected to the source of the third input switch (Q3), the drain of the fourth input switch (Q4), and the second terminal of the magnetizing inductor (Lm).

The first terminal on the secondary side of the first transformer (T1) is connected to the anode of the first diode (D1) and the cathode of the second diode (D2), and the second terminal on the secondary side of the first transformer (T1) is connected to the anode of the first diode (D1) and the cathode of the second diode (D2). It can be connected to the source of the first output switch (S1) and the drain of the second output switch (S2).

The first and second diodes (D1, D2) are connected in series between the first terminal on the primary side of the second transformer (T2) and the first terminal on the secondary side of the second transformer (T2), and the first and second diodes The first and second diode voltages (Vd1 and Vd2) are applied to the two diodes (D1 and D2), respectively, and the first and second diode currents (Id1 and Id2) flow, respectively.

For example, the anode of the first diode (D1) is connected to the first terminal of the secondary side of the first transformer (T1) and the cathode of the second diode (D2), and the cathode of the first diode (D1) is connected to the second terminal of the first transformer (T1). It is connected to the first terminal of the primary side of the transformer (T2) and the first terminal of the first output inductor (Lo1), and the anode of the second diode (D2) is the first terminal of the secondary side of the second transformer (T2). It is connected to the first terminal of the second output inductor (Lo2), and the cathode of the second diode (D2) may be connected to the first terminal of the secondary side of the first transformer (T1) and the anode of the first diode (D1). .

The first output inductor (Lo1) is connected between the first and second terminals on the primary side of the second transformer (T2), and the second output inductor (Lo2) is connected between the first and second terminals on the secondary side of the second transformer (T2). It is connected between the second terminals, and first and second inductor currents (Io1 and Io2) flow through the first and second output inductors (Lo1 and Lo2, respectively).

For example, the first terminal of the first output inductor (Lo1) is connected to the cathode of the first diode (D1) and the first terminal of the primary side of the second transformer (T2), and the first terminal of the first output inductor (Lo1) The second terminal can be connected to the second terminal of the primary side of the second transformer (T2), the drain of the first output switch (S1), the first terminal of the output capacitor (Co), and the first terminal of the output resistor (Ro). there is.

The first terminal of the second output inductor (Lo2) is connected to the anode of the second diode (D2) and the first terminal of the secondary side of the second transformer (T2), and the second terminal of the second output inductor (Lo2) is connected to the anode of the second diode (D2) and the first terminal of the secondary side of the second transformer (T2). It can be connected to the second terminal of the secondary side of the second transformer (T2), the source of the second output switch (S2), the second terminal of the output capacitor (Co), and the second terminal of the output resistor (Ro).

The first and second output switches (S1, S2) are connected in series between the second terminal on the primary side of the second transformer (T2) and the second terminal on the secondary side of the second transformer (T2), and the first and First and second switch voltages (Vs1 and Vs2) are applied to the second output switches (S1 and S2), respectively.

For example, the first and second output switches S1 and S2 may be negative (n) type transistors.

The gate of the first output switch (S1) is connected to the first output gate voltage (Gs1), and the drain of the first output switch (S1) is the second terminal of the primary side of the second transformer (T2) and the first output inductor. It is connected to the second terminal of (Lo1), the first terminal of the output capacitor (Co), and the first terminal of the output resistance (Ro), and the source of the first output switch (S1) is the secondary side of the first transformer (T1). The second terminal of can be connected to the drain of the second output switch (S2).

The gate of the second output switch (S2) is connected to the second output gate voltage (Gs2), and the drain of the second output switch (S2) is the second terminal of the secondary side of the first transformer (T1) and the first output switch. It is connected to the source of (S1), and the source of the second output switch (S2) is the second terminal of the secondary side of the second transformer (T2), the second terminal of the second output inductor (Lo2), and the output capacitor (Co) It can be connected to the second terminal of the output resistance (Ro).

The output capacitor (Co) and the output resistance (Ro) are connected in parallel between the second terminal of the primary side of the second transformer (T2) and the second terminal of the secondary side of the second transformer (T2), and the output capacitor (Co ) and the output voltage (Vo) is output from the output resistance (Ro).

For example, the first terminal of the output capacitor (Co) and the first terminal of the output resistor (Ro) are the second terminal of the primary side of the second transformer (T2), the second terminal of the first output inductor (Lo1), It is connected to the drain of the first output switch (S1), and the second terminal of the output capacitor (Co) and the second terminal of the output resistance (Ro) are the second terminal of the secondary side of the second transformer (T2) and the second output. It can be connected to the second terminal of the inductor (Lo2) and the source of the second output switch (S2).

In this combination inductor rectifier phase shift full bridge converter 110, the first and second input switches (Q1, Q2) are alternately turned on and off, and the third And the fourth input switches (Q3, Q4) are alternately turned on and off, and the first and second output switches (S1, S2) are alternately turned on and off to produce an output voltage (Vo). is controlled, which will be explained with reference to the drawings.

Figure 2 is a waveform diagram showing the gate signal of a coupled inductor rectifier phase shift full bridge converter according to an embodiment of the present invention, and Figures 3a and 3b are respectively a coupled inductor rectifier phase shift full bridge converter according to an embodiment of the present invention. It is a diagram showing the build-up state and the powering state, and FIG. 4 is a waveform diagram showing the gate signal of the coupled inductor rectifier phase shift full bridge converter according to a comparative example, which will be described with reference to FIG. 1.

As shown in FIG. 2, in the combined inductor rectifier phase shift full bridge converter 110 according to an embodiment of the present invention, a high level signal is applied to the gate of the first input switch (Q1) during the first input period (Tq1). The first input gate voltage (Gq1) is applied and the low level second input gate voltage (Gq2) is applied to the gate of the second input switch (Q2), so that the first input switch (Q1) is turned on and the second input is turned on. Switch (Q2) is turned off.

During the second input section (Tq2) spaced apart from the first input section (Tq1), a low-level first input gate voltage (Gq1) is applied to the gate of the first input switch (Q1) and the second input switch (Q2) A high level second input gate voltage (Gq2) is applied to the gate of so that the first input switch (Q1) is turned off and the second input switch (Q2) is turned on.

During the third input period (Tq3), which is the same as the second input period (Tq2), the high level third input gate voltage (Gq3) is applied to the gate of the third input switch (Q1) and the fourth input switch (Q4) A low level fourth input gate voltage (Gq4) is applied to the gate, so that the third input switch (Q3) is turned on and the fourth input switch (Q4) is turned off.

During the fourth input section (Tq4), which is spaced apart from the third input section (Tq3) and is equal to the first input section (Tq1), a low level third input gate voltage (Gq3) is applied to the gate of the third input switch (Q3). is applied, and the high level fourth input gate voltage (Gq4) is applied to the gate of the fourth input switch (Q4), so that the third input switch (Q3) is turned off and the fourth input switch (Q4) is turned on. .

During the first output section (Ts1) partially overlapping the first to fourth input sections (Tq1 to Tq4), a high-level first output gate voltage (Gs1) is applied to the gate of the first output switch (S1), A low level second output gate voltage (Gs2) is applied to the gate of the second output switch (S2), so that the first output switch (S1) is turned on and the second output switch (S2) is turned off.

During the second output section (Ts2), which is spaced apart from the first output section (Ts1) and partially overlaps the first to fourth input sections (Tq1 to Tq4), a low level voltage is applied to the gate of the first output switch (S1). 1 The output gate voltage (Gs1) is applied and the high level second output gate voltage (Gs2) is applied to the gate of the second output switch (S2), so the first output switch (S1) is turned off and the second output switch (S2) is turned off. (S2) turns on.

Here, the first and fourth input sections (Tq1) relative to the sum (1 cycle) of the first and second input sections (Tq1, Tq2) or the sum (1 cycle) of the third and fourth input sections (Tq3, Tq4). , Tq4) or the ratio of the overlapping sections of the second and third input sections (Tq2, Tq3) is defined as the duty ratio (DR), which may be about 0.5.

Accordingly, during the first and fourth input sections (Tq1, Tq4), the first and fourth input switches (Q1, Q4) are turned on and the second and third input switches (Q2, Q3) are turned off. , During the second and third input sections (Tq2, Tq3), the first and fourth input switches (Q1, Q4) are turned off and the second and third input switches (Q2, Q3) are turned on.

And, the ratio of the overlap section of the first and fourth input sections (Tq1, Tq4) and the first output section (Ts1) to the sum of the first and second output sections (Ts1, Ts2) and the first and second output The ratio of the overlap section of the second and third input sections (Tq2, Tq3) and the second output section (Ts2) to the sum of the sections (Ts1, Ts2) is defined as a boost duty ratio (BDR), respectively. , the boost duty ratio (BDR) may be from about 0 to about 0.3.

Accordingly, during the first output section (Ts1), the first output switch (S1) is turned on and the second output switch (S2) is turned off, and during the second output section (Ts2) the first output switch (S1) is turned on. ) is turned off and the second output switch (S2) is turned on, and the first and fourth input switches (Q1, Q4) are turned on during the first and fourth input sections (Tq1, Tq4). The first output switch (S1) changes from the turn-on state to the turn-off state, and the second output switch (S2) changes from the turn-off state to the turn-on state, so that the turn-on state of the first output switch (S1) The on state can be used as a boost operation for the first diode (D1).

And, during the second and third input sections (Tq2, Tq3) in which the second and third input switches (Q2, Q3) are turned on, the second output switch (S2) changes from the turn-on state to the turn-off state. and the first output switch (S1) is changed from the turn-off state to the turn-on state, so that the turn-on state of the second output switch (S2) can be used as a boost operation for the second diode (D2). .

As shown in FIG. 3A, in the combined inductor rectifier phase shift full bridge converter 110 according to an embodiment of the present invention, the first output section (Ts1) overlaps the first and fourth input sections (Tq1 and Tq4). While the first output switch (S1) is turned on and the second output switch (S2) is turned off, the first input voltage (Vi1) and the first diode (D1) on the secondary side of the first transformer (T1) , the first output inductor (Lo1) and the first switch (S1) constitute a closed loop circuit and enter a build-up state in which the first diode (D1) is charged.

As shown in Figure 3b, in the combined inductor rectifier phase shift full bridge converter 110 according to an embodiment of the present invention, the second output section (Ts2) overlaps the first and fourth input sections (Tq1 and Tq4) While the first output switch (S1) is turned off and the second output switch (S2) is turned on, the first input voltage (Vi1) and the first diode (D1) on the secondary side of the first transformer (T1) , the first output inductor (Lo1), the output capacitor (Co), the output resistance (Ro), and the second switch (S2) form a closed loop circuit to output the output voltage (Vo). do.

Although not shown, in the combined inductor rectifier phase shift full bridge converter 110 according to an embodiment of the present invention, the first output is output during the second output section Ts2 overlapping with the second and third input sections Tq2 and Tq3. The switch (S1) is turned off and the second output switch (S2) is turned on, and the first input voltage (Vi1), the second switch (S2), and the second output on the secondary side of the first transformer (T1) The inductor (Lo2) and the first diode (D1) form a closed loop circuit and enter a build-up state to charge the second diode (D2).

And, in the combined inductor rectifier phase shift full bridge converter 110 according to an embodiment of the present invention, the first output switch ( S1) is turned on and the second output switch (S2) is turned off, and the first input voltage (Vi1), the first switch (S1), and the output capacitor (Co) on the secondary side of the first transformer (T1) And the output resistance (Ro), the second output inductor (Lo2), and the second diode (D2) form a closed loop circuit to enter a powering state in which the output voltage (Vo) is output.

On the other hand, as shown in FIG. 4, in the combined inductor rectifier phase shift full bridge converter according to the comparative example, a high-level first input is applied to the gate of the first input switch (Q1) during the first input period (Tq1). The gate voltage (Gq1) is applied, and the low level second input gate voltage (Gq2) is applied to the gate of the second input switch (Q2), so that the first input switch (Q1) is turned on and the second input switch (Q2) is turned on. ) is turned off.

During the second input section (Tq2) spaced apart from the first input section (Tq1), a low-level first input gate voltage (Gq1) is applied to the gate of the first input switch (Q1) and the second input switch (Q2) A high level second input gate voltage (Gq2) is applied to the gate of so that the first input switch (Q1) is turned off and the second input switch (Q2) is turned on.

During the third input section (Tq3), which partially overlaps the first and second input sections (Tq1, Tq2), a high-level third input gate voltage (Gq3) is applied to the gate of the third input switch (Q1), A low level fourth input gate voltage (Gq4) is applied to the gate of the fourth input switch (Q4), so that the third input switch (Q3) is turned on and the fourth input switch (Q4) is turned off.

During the fourth input section (Tq4), which is spaced from the third input section (Tq3) and partially overlaps the first and second input sections (Tq1, Tq2), a low-level signal is applied to the gate of the third input switch (Q3). The 3rd input gate voltage (Gq3) is applied and the high level 4th input gate voltage (Gq4) is applied to the gate of the 4th input switch (Q4), so the 3rd input switch (Q3) is turned off and the 4th input switch (Q4) is turned off. (Q4) turns on.

During the first output section (Ts1), which is the same as the overlapping section of the second and third input sections (Tq2, Tq3), a high-level first output gate voltage (Gs1) is applied to the gate of the first output switch (S1), A low level second output gate voltage (Gs2) is applied to the gate of the second output switch (S2), so that the first output switch (S1) is turned on and the second output switch (S2) is turned off.

During the second output section (Ts2), which is spaced apart from the first output section (Ts1) and is equal to the overlapping section of the first and fourth input sections (Tq1, Tq4), a low-level signal is applied to the gate of the first output switch (S1). 1 The output gate voltage (Gs1) is applied and the high level second output gate voltage (Gs2) is applied to the gate of the second output switch (S2), so the first output switch (S1) is turned off and the second output switch (S2) is turned off. (S2) turns on.

Here, the overlap section or second input section of the first and fourth input sections (Tq1, Tq4) with respect to the sum of the first and second input sections (Tq1, Tq2) or the sum of the third and fourth input sections (Tq3, Tq4). The duty ratio (DR), which is the ratio of the overlapping section of the second and third input sections (Tq2 and Tq3), may be about 0 to about 0.5.

Accordingly, the overlapping section of the first and fourth input sections (Tq1, Tq4) is the same as the second output section (Ts2), and the overlapping section of the second and third input sections (Tq2, Tq3) is the first output section. Same as (Ts1).

And, the ratio of the overlap section of the first and fourth input sections (Tq1, Tq4) and the first output section (Ts1) to the sum of the first and second output sections (Ts1, Ts2) and the first and second output The boost duty ratio (BDR), which is the ratio of the overlapping section of the second and third input sections (Tq2, Tq3) and the second output section (Ts2) to the sum of the sections (Ts1 and Ts2), may be about 0.

Accordingly, during the first output section (Ts1), the first output switch (S1) is turned on and the second output switch (S2) is turned off, and during the second output section (Ts2) the first output switch (S1) is turned on. ) is turned off and the second output switch (S2) is turned on, and the first and fourth input switches (Q1, Q4) are turned on during the first and fourth input sections (Tq1, Tq4). 1 and the second output switches (S1, S2) are maintained in the turn-off state and turn-on state, respectively, so that the first input voltage (Vi1) and the first diode (D1) on the secondary side of the first transformer (T1) , the first output inductor (Lo1), the output capacitor (Co), the output resistance (Ro), and the second switch (S2) form a closed loop circuit to output the output voltage (Vo).

And, during the second and third input sections (Tq2, Tq3) in which the second and third input switches (Q2, Q3) are turned on, the first and second output switches (S1, S2) are turned on, respectively. and is maintained in the turn-off state, so that the first input voltage (Vi1), first switch (S1), output capacitor (Co) and output resistance (Ro), and second output inductor on the secondary side of the first transformer (T1) (Lo2), the second diode (D2) forms a closed loop circuit and outputs the output voltage (Vo).

As above, the combined inductor rectifier phase shift full-bridge converter according to the comparative example fixes the boost duty ratio (BDR) at about 0 and adjusts the duty ratio (DR) to generate the output voltage (Vo) from the input voltage (Vi). In this case, the first and second output switches (S1, S2) each have a relatively low voltage stress corresponding to the output voltage (Vo), but the first and second diodes (D1, D2) each have a relatively wide input voltage. (Vi) has a relatively high voltage stress in the range.

On the other hand, the combined inductor rectifier phase shift full bridge converter 110 according to an embodiment of the present invention fixes the duty ratio (DR) at about 0.5 and adjusts the boost duty ratio (BDR) to change the output voltage from the input voltage (Vi). (Vo), the first and second output switches (S1, S2) each have a relatively low voltage stress corresponding to the output voltage (Vo), and at the same time have a relatively high gain and It has a high turns ratio, and as a result, the first and second diodes D1 and D2 each have relatively low voltage stress over a relatively wide range of input voltage Vi. Accordingly, efficiency is improved and manufacturing costs are reduced because diodes with relatively low ratings can be used.

A plurality of waveforms of the coupled inductor rectifier phase shift full bridge converter 110 according to an embodiment of the present invention and the coupled inductor rectifier phase shift full bridge converter according to a comparative example will be described with reference to the drawings.

5A, 5B, and 5C are diagrams showing multiple waveforms of a coupled inductor rectifier phase shift full-bridge converter according to an embodiment of the present invention for input voltages of about 200V, about 300V, and about 400V, respectively, and FIG. 6A , FIGS. 6B and 6C are diagrams showing a plurality of waveforms of a coupled inductor rectifier phase shift full bridge converter according to a comparative example for input voltages of about 200V, about 300V, and about 400V, respectively, and FIG. 7 is an embodiment of the present invention. A diagram showing the diode voltage stress of a coupled inductor rectifier phase shift full bridge converter according to examples and comparative examples, and will be described with reference to FIGS. 1 to 4.

5A, 5B, and 5C, the coupled inductor rectifier phase shift full bridge converter 110 according to an embodiment of the present invention has a switching frequency of about 100 kHz, an output voltage (Vo) of about 56 V, and a duty ratio of about 0.5. (DR), magnetized inductor (Lm) of about 600 μH, first output inductor (Lo1) of about 30 μH, second output inductor (Lo2) of about 30 μH, output capacitor (Co) of about 350 μF, first output inductor of about 6.42:1 It has a turns ratio of 1 transformer (T1).

As shown in FIG. 5A, when the input voltage (Vi) is about 200V and the boost duty ratio (BDR) is about 0.29, the second and third input switches (Q2, Q3) are turned on. The anode and cathode of the first diode (D1) in the first boost section (Tb1) where the third input section (Tq2, Tq3) and the second output section (Ts2) where the second output switch (S2) is turned on overlap. A first diode voltage (Vd1) of about 112V is applied to the first diode (D1) to have a voltage stress of about 112V, and the first and fourth input switches (Q1, Q4) are turned on. 4In the second boost section (Tb2) where the input section (Tq1, Tq4) and the first output section (Ts1) where the first output switch (S1) is turned on overlap, the anode and cathode of the second diode (D2) A second diode voltage (Vd2) of about 112V is applied so that the second diode (D2) has a voltage stress of about 112V.

And, in the first output section (Ts1) where the first output switch (S1) is turned on, the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the second output switch (S2). ) is applied, so that the second output switch (S2) has a voltage stress of about 56V, and the second output switch (S2) is turned on in the second output section ( In Ts2), the first switch voltage (Vs1) of about 56V corresponding to the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the first output switch (S1), The output switch (S1) has a voltage stress of approximately 56V.

As shown in Figure 5b, when the input voltage (Vi) is about 300V and the boost duty ratio (BDR) is about 0.13, the second and third input switches (Q2, Q3) are turned on. The anode and cathode of the first diode (D1) in the first boost section (Tb1) where the third input section (Tq2, Tq3) and the second output section (Ts2) where the second output switch (S2) is turned on overlap. A first diode voltage (Vd1) of about 141V is applied to the first diode (D1) to have a voltage stress of about 141V, and the first and fourth input switches (Q1, Q4) are turned on. 4In the second boost section (Tb2) where the input section (Tq1, Tq4) and the first output section (Ts1) where the first output switch (S1) is turned on overlap, the anode and cathode of the second diode (D2) A second diode voltage (Vd2) of about 141V is applied so that the second diode (D2) has a voltage stress of about 141V.

And, in the first output section (Ts1) where the first output switch (S1) is turned on, the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the second output switch (S2). ) is applied, so that the second output switch (S2) has a voltage stress of about 56V, and the second output switch (S2) is turned on in the second output section ( In Ts2), the first switch voltage (Vs1) of about 56V corresponding to the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the first output switch (S1), The output switch (S1) has a voltage stress of approximately 56V.

As shown in FIG. 5C, when the input voltage (Vi) is about 400V and the boost duty ratio (BDR) is about 0, the second and third input switches (Q2, Q3) are turned on. The anode and cathode of the first diode (D1) in the first duty section (Td1) where the third input section (Tq2, Tq3) and the first output section (Ts1) where the first output switch (S1) is turned on overlap. A first diode voltage (Vd1) of about 61.5V is applied to the first diode (D1) to have a voltage stress of about 61.5V, and the first and fourth input switches (Q1, Q4) are turned on. And the anode and A second diode voltage (Vd2) of about 61.5V is applied to the cathode, so that the second diode (D2) has a voltage stress of about 61.5V.

And, in the first output section (Ts1) where the first output switch (S1) is turned on, the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the second output switch (S2). ) is applied, so that the second output switch (S2) has a voltage stress of about 56V, and the second output switch (S2) is turned on in the second output section ( In Ts2), the first switch voltage (Vs1) of about 56V corresponding to the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the first output switch (S1), The output switch (S1) has a voltage stress of approximately 56V.

On the other hand, in FIGS. 6A, 6B, and 6C, the combined inductor rectifier phase shift full-bridge converter according to the comparative example has a switching frequency of about 100 kHz, an output voltage (Vo) of about 56 V, and a boost duty ratio (BDR) of about 0. ), magnetized inductor (Lm) of approximately 600 μH, first output inductor (Lo1) of approximately 30 μH, second output inductor (Lo2) of approximately 30 μH, output capacitor (Co) of approximately 350 μF, first transformer of approximately 2.57:1 It has a turns ratio of (T1).

As shown in Figure 6a, when the input voltage (Vi) is about 200V and the duty ratio (DR) is about 0.5, the second and third input switches (Q2, Q3) are turned on. 3 In the first duty section (Td1) where the input section (Tq2, Tq3) and the first output section (Ts1) where the first output switch (S1) is turned on overlap, the anode and cathode of the first diode (D1) The first diode voltage (Vd1) of about 83V is applied so that the first diode (D1) has a voltage stress of about 83V, and the first and fourth input switches (Q1, Q4) are turned on. In the second duty section (Td2) where the input section (Tq1, Tq4) and the second output section (Ts2) where the second output switch (S2) is turned on overlap, about 100% voltage is applied to the anode and cathode of the second diode (D2). A second diode voltage (Vd2) of 83V is applied, so that the second diode (D2) has a voltage stress of about 83V.

And, in the first output section (Ts1) where the first output switch (S1) is turned on, the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the second output switch (S2). ) is applied, so that the second output switch (S2) has a voltage stress of about 56V, and the second output switch (S2) is turned on in the second output section ( In Ts2), the first switch voltage (Vs1) of about 56V corresponding to the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the first output switch (S1), The output switch (S1) has a voltage stress of approximately 56V.

As shown in Figure 6b, when the input voltage (Vi) is about 300V and the duty ratio (DR) is about 0.265, the second and third input switches (Q2, Q3) are turned on. 3 In the first duty section (Td1) where the input section (Tq2, Tq3) and the first output section (Ts1) where the first output switch (S1) is turned on overlap, the anode and cathode of the first diode (D1) The first diode voltage (Vd1) of about 143V is applied so that the first diode (D1) has a voltage stress of about 143V, and the first and fourth input switches (Q1, Q4) are turned on. In the second duty section (Td2) where the input section (Tq1, Tq4) and the second output section (Ts2) where the second output switch (S2) is turned on overlap, about 100% voltage is applied to the anode and cathode of the second diode (D2). A second diode voltage (Vd2) of 143V is applied so that the second diode (D2) has a voltage stress of about 143V.

And, in the first output section (Ts1) where the first output switch (S1) is turned on, the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the second output switch (S2). ) is applied, so that the second output switch (S2) has a voltage stress of about 56V, and the second output switch (S2) is turned on in the second output section ( In Ts2), the first switch voltage (Vs1) of about 56V corresponding to the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the first output switch (S1), The output switch (S1) has a voltage stress of approximately 56V.

As shown in Figure 6c, when the input voltage (Vi) is about 400V and the duty ratio (BDR) is about 0.185, the second and third input switches (Q2, Q3) are turned on. 3 In the first duty section (Td1) where the input section (Tq2, Tq3) and the first output section (Ts1) where the first output switch (S1) is turned on overlap, the anode and cathode of the first diode (D1) The first diode voltage (Vd1) of about 204V is applied so that the first diode (D1) has a voltage stress of about 204V, and the first and fourth input switches (Q1, Q4) are turned on. In the second duty section (Td2) where the input section (Tq1, Tq4) and the second output section (Ts2) where the second output switch (S2) is turned on overlap, about 100% voltage is applied to the anode and cathode of the second diode (D2). A second diode voltage (Vd2) of 204V is applied so that the second diode (D2) has a voltage stress of about 204V.

And, in the first output section (Ts1) where the first output switch (S1) is turned on, the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the second output switch (S2). ) is applied, so that the second output switch (S2) has a voltage stress of about 56V, and the second output switch (S2) is turned on in the second output section ( In Ts2), the first switch voltage (Vs1) of about 56V corresponding to the first input voltage (Vi1) of the secondary side of the first transformer (T1) is applied to the drain and source of the first output switch (S1), The output switch (S1) has a voltage stress of approximately 56V.

As shown in FIG. 7, the combined inductor rectifier phase shift full-bridge converter according to the comparative example having a turns ratio of the first transformer (T1) of about 2.57:1 has an input voltage (Vi) of about 200V, about 300V, and about 400V. ) have a duty ratio (DR) of about 0.5, about 0.265, and about 0.185, respectively, and diode voltage stresses (Vd1, Vd2) of about 83V, about 143V, and about 204V, respectively, so an input voltage of about 200V to about 400V. (Vi) and have diode voltage stresses (Vd1, Vd2) of about 83V to about 204V, and diodes with a rated voltage of about 250V can be used as the first and second diodes (D1, D2).

On the other hand, the combined inductor rectifier phase shift full-bridge converter 110 according to an embodiment of the present invention with a turns ratio of the first transformer T1 of about 6.42:1 has an input voltage of about 200V, about 300V, and about 400V ( With respect to Vi), it has a boost duty ratio (BDR) of about 0.29, about 0.13, and about 0, respectively, and diode voltage stresses (Vd1, Vd2) of about 112V, about 141V, and about 61.5V, respectively, so about 200V to about 400V. It has diode voltage stresses (Vd1, Vd2) of about 61.5V to about 112V in the input voltage (Vi) range, and diodes with a rated voltage of about 200V can be used as the first and second diodes (D1, D2).

Here, the combined inductor rectifier phase shift full bridge converter 110 according to an embodiment of the present invention has a boost duty ratio ( BDR) can output an output voltage (Vo) of about 56V. For example, for an input voltage (Vi) of about 200V to about 300V, an output voltage (Vo) of about 56V can be output with a boost duty ratio (BDR) of about 0.3 to about 0.1. An output voltage (Vo) can be output, and an output voltage (Vo) of about 56V can be output with a boost duty ratio (BDR) of about 0.1 to about 0 with respect to an input voltage (Vi) of about 300V to about 400V.

That is, the combined inductor rectifier phase shift full-bridge converter 110 according to an embodiment of the present invention, which fixes the duty ratio (DR) at 0.5 and adjusts the boost duty ratio (BDR), adjusts the duty ratio (DR) and adjusts the boost duty ratio (DR). Compared to the combined inductor rectifier phase shift full bridge converter according to the comparative example in which the duty ratio (BDR) is fixed to 0, the turns ratio (e.g., For example, about 6.42:1) and have relatively low diode voltage stress (e.g., about 61.5 V to about 112 V), which results in the use of diodes with relatively low voltage ratings (e.g., about 200 V). and can reduce manufacturing costs.

As such, in the combined inductor rectifier phase shift full bridge converter 110 according to an embodiment of the present invention, the first and fourth input sections (Tq1, Tq4) are set to be the same, and the second and third input sections (Tq2, By setting Tq3) the same, fixing the duty ratio (DR) to 0.5, and setting the turns ratio to a relatively high value, the output voltage (Vo) is output by adjusting the boost duty ratio (BDR), so that the switch voltage stress is reduced. The output voltage (Vo) is fixed and diode voltage stress is reduced, improving efficiency and reducing manufacturing costs.

Although the present invention has been described above with reference to preferred embodiments, those skilled in the art may make various modifications and changes to the present invention without departing from the technical spirit and scope of the present invention as set forth in the claims below. You will understand that you can do it.

110: Combined inductor rectifier phase shift full bridge converter
Vi: input voltage Q1 to Q4: first to fourth input switches
Lm: magnetized inductor T1, T2: first and second transformers
D1, D2: first and second diodes Lo1, Lo2: first and second output inductors
S1, S2: First and second output switches Co: Output capacitor
Ro: output resistance Vo: output voltage

Claims (10)

first and second input switches connected in series between the high potential terminal and the low potential terminal of the input voltage;
third and fourth input switches connected in series between the high potential terminal and the low potential terminal of the input voltage;
a first transformer connected to the first to fourth input switches;
a magnetized inductor connected to the primary side of the first transformer;
first and second diodes connected to the secondary side of the first transformer;
a second transformer connected to the first and second diodes;
first and second output inductors respectively connected to the primary and secondary sides of the second transformer;
first and second output switches connected in series between the primary side and the secondary side of the second transformer;
An output capacitor and an output resistance connected in parallel to the first and second output switches.
Including,
The first input section in which the first input switch is turned on and the fourth input section in which the fourth input switch is turned on are the same,
The second input section in which the second input switch is turned on and the third input section in which the third input switch is turned on are the same,
The first output section in which the first output switch is turned on overlaps with the first and second input sections,
The second output section in which the second output switch is turned on overlaps the first and second input sections. A combined inductor rectifier phase shift full bridge converter.
According to claim 1,
The ratio of the first boost section overlapping the second and third input sections and the second output section or the second boost section overlapping the first and fourth input sections to the sum of the first and second output sections. A coupled inductor rectifier phase shift full bridge converter with a boost duty ratio of 0 to 0.3.
According to claim 2,
When the input voltage is 200V to 300V, the boost duty ratio is 0.3 to 0.1,
When the input voltage is 300V to 400V, the boost duty ratio is a combined inductor rectifier phase shift full bridge converter of 0.1 to 0.
According to claim 1,
Duty is the ratio of the overlapping section of the first and fourth input sections or the overlapping section of the second and third input sections to the sum of the first and second input sections or the sum of the third and fourth input sections. Coupled inductor rectifier phase shift full bridge converter with a ratio of 0.5.
According to claim 1,
During the first input period, the first input switch is turned on and the second input switch is turned off,
During the second input period, the first input switch is turned off and the second input switch is turned on,
During the third input period, the third input switch is turned on and the fourth input switch is turned off,
During the fourth input period, the third input switch is turned off and the fourth input switch is turned on,
During the first output period, the first output switch is turned on and the second output switch is turned off,
A combined inductor rectifier phase shift full bridge converter in which the first output switch is turned off and the second output switch is turned on during the second output period.
According to claim 1,
The anode of the first diode is connected to the first terminal of the secondary side of the first transformer and the cathode of the second diode, and the cathode of the first diode is connected to the first terminal of the primary side of the second transformer. Connected to the first terminal of the first output inductor,
The anode of the second diode is connected to the first terminal of the secondary side of the second transformer and the first terminal of the second output inductor, and the cathode of the second diode is connected to the secondary side of the first transformer. A first terminal, a combined inductor rectifier phase shift full bridge converter connected to the anode of the first diode.
A combination including first to fourth input switches, first and second transformers, magnetized inductors, first and second diodes, first and second output inductors, first and second output switches, output capacitors, and output resistance. In the driving method of the inductor rectifier phase shift full bridge converter,
turning on the first input switch during a first input period;
turning on the second input switch during a second input section spaced from the first input section;
turning on the third input switch during a third input period identical to the second input period;
turning on the fourth input switch during a fourth input section that is spaced from the third input section and is the same as the first input section;
turning on the first output switch during a first output section overlapping the first to fourth input sections;
Turning on the second output switch during a second output section that is spaced from the first output section and overlaps the first to fourth input sections.
Driving method of a combined inductor rectifier phase shift full bridge converter.
According to claim 7,
The ratio of the first boost section overlapping the second and third input sections and the second output section or the second boost section overlapping the first and fourth input sections to the sum of the first and second output sections. Driving method of a combined inductor rectifier phase shift full bridge converter with an in boost duty ratio of 0 to 0.3.
According to claim 7,
Duty is the ratio of the overlapping section of the first and fourth input sections or the overlapping section of the second and third input sections to the sum of the first and second input sections or the sum of the third and fourth input sections. Driving method of a combined inductor rectifier phase shift full bridge converter with a ratio of 0.5.
According to claim 7,
During the first input period, the first input switch is turned on and the second input switch is turned off,
During the second input period, the first input switch is turned off and the second input switch is turned on,
During the third input period, the third input switch is turned on and the fourth input switch is turned off,
During the fourth input period, the third input switch is turned off and the fourth input switch is turned on,
During the first output period, the first output switch is turned on and the second output switch is turned off,
A method of driving a combined inductor rectifier phase shift full bridge converter in which the first output switch is turned off and the second output switch is turned on during the second output period.