Double-switch inductor Boost converter

Abstract

The invention discloses a double-switch inductor Boost converter, and belongs to the technical field of power electronic inverters. The problems that the direct connection time of an existing Boost circuit is limited, the boosting capacity is small, and the device voltage stress is large are solved. The circuit comprises a DC voltage source Vin, diodes D0 to D9, an output capacitor C0, a power switch S, and inductors L1 to L4. The output capacitor C0, the diode D0 and the load resistor R form an output unit of the double-switch inductance Boost converter, and the output unit can greatly improve the voltage gain. The invention is mainly used for DC boost conversion. The invention is mainly used for DC boost conversion.

Description

Technical Field

[0001] The invention belongs to the technical field of power electronic inverters, and in particular relates to a dual-switch inductor Boost converter. Background Art

[0002] Boost converters are widely used in the front-stage converters of distributed power systems to achieve the boost function. The dual-switch design can effectively reduce the voltage stress of the switching device, which enables the selection of switching devices with lower voltage levels and reduces costs. Secondly, the addition of inductance helps to achieve smooth storage and release of energy, reduce input current ripple, and thus improve the power factor of the system. In theory, the voltage gain of the Boost circuit increases with the increase of the duty cycle. However, considering the parasitic equivalent series impedance in the actual circuit, the actual gain of the Boost circuit does not always increase with the increase of the duty cycle. Therefore, its through-time is limited, resulting in a small boost capability and large device voltage stress. It is not suitable for high voltage gain DC power conversion occasions. The above problems need to be solved urgently. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the through time of the existing Boost circuit is limited, resulting in small boost capability and large device voltage stress. The present invention provides a dual-switch inductor Boost converter.

[0004] A dual-switch inductor Boost converter including a DC voltage source V in , diodes D0 to D9, output capacitor C0, power switch S, and inductors L1 to L4; the voltage across the output capacitor C0 serves as the output voltage V0 of the Boost converter;

[0005] DC voltage source V in The positive electrode of is connected to the anode of diode D4, one end of inductor L1 and the anode of diode D1 at the same time, the anode of diode D2 is connected to the other end of inductor L1 and the anode of diode D3 at the same time, the cathode of diode D2 is connected to one end of inductor L2 and the cathode of diode D1 at the same time, the anode of diode D5 is connected to the cathode of diode D3, the anode of diode D6 and the other end of inductor L2 at the same time, the anode of diode D7 is connected to the cathode of diode D5, the cathode of diode D4 and one end of inductor L3 at the same time, the anode of diode D8 is connected to the other end of inductor L3 and the anode of diode D9 at the same time, the cathode of diode D8 is connected to the cathode of diode D7 and one end of inductor L4 at the same time, the cathode of diode D6 is connected to the other end of inductor L4, the cathode of diode D9, the anode of diode D0 and the drain of power switch S at the same time, the cathode of diode D0 is connected to one end of output capacitor C0 and one end of load resistor R at the same time,

[0006] DC voltage source Vin The negative electrode of is connected to the source of the power switch S, the other end of the output capacitor C0 and the other end of the load resistor R at the same time.

[0007] Preferably, the voltage gain of the Boost converter D is the on-duty cycle of the power switch S.

[0008] Preferably, the Boost converter has two operating modes in one switching cycle, namely an on state and an off state.

[0009] Preferably, in the on-state working mode, the power switch tube S is turned on, and the DC voltage source V in The inductor L2 is charged through the diode D1, and the DC voltage source V in Directly connect the inductor L1, the diode D2 is reverse biased and cut off, and D3 is forward biased and turned on; at the same time, the DC voltage source V in The inductors L3 and L4 are charged through the diode D4, and the diodes D7 and D9 are forward biased and turned on, the diodes D5 and D8 are reverse biased and turned off, the diode D0 is reverse biased and turned off, and the output capacitor C0 supplies power to the load resistor R independently.

[0010] Preferably, in the off-state operating mode, the power switch tube S remains off, the diodes D1, D3, D4, D6, D7 and D9 are reverse biased and cut off, and the diodes D2, D5, D8 and D0 are forward biased and turned on. At the same time, the DC voltage source V in The output electric energy sequentially passes through inductors L1 to L4 and diode D0 to supply power to load resistor R and output capacitor C0.

[0011] Preferably, the on-duty cycle adjustment range of the power switch tube S is (0, 1).

[0012] Preferably, the optimal conduction duty cycle of the power switch tube S is 0.4.

[0013] Advantages of the present invention:

[0014] The dual-switch inductor Boost converter proposed in the present invention has a DC voltage source V in Directly connecting the inductor L1 makes the input current continuous, which can continuously provide relatively stable energy to the circuit. The voltage of the diode D1 and the diode D5 is much lower than the output voltage, and the current of the inductor L1 and the inductor L4 does not fluctuate greatly, which reduces energy loss, reduces component voltage stress, and reduces circuit current ripple. At the same time, it meets the requirements of fast transient response and adjusts the circuit's duty cycle to optimize performance, thereby improving energy conversion efficiency and boost capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a structural schematic diagram of the dual-switch inductor Boost converter of the present invention;

[0016] Figure 2 is an equivalent circuit diagram of the dual-switch inductor Boost converter of the present invention when the power switch S is turned on and off; wherein, Figure 2 a is the equivalent circuit diagram of the coupled inductor square boost converter when the power switch S is turned on. Figure 2 b is the equivalent circuit diagram of the coupled inductor square Boost converter when the power switch S is turned off;

[0017] Figure 3 When the dual-switch inductor Boost converter of the present invention is used for boost conversion, when the input voltage V in =50V, the output voltage V0 is about 183V when the experimental waveform;

[0018] Figure 3 a is the voltage V0 of the output capacitor C0, which is about 183V and the input voltage V in =50V comparison waveform;

[0019] Figure 3 b is a comparison waveform diagram of the output diode D0 voltage peak value of about 183V and the power switch S voltage peak value of about 183V;

[0020] Figure 3 c is a waveform comparison diagram of the current flowing through the inductor L1 and the current flowing through the inductor L4;

[0021] Figure 3 d is a comparison diagram of the voltage waveforms of diodes D1 and D5. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0024] Specific implementation method 1. Combination Figure 1 As shown, this embodiment provides a dual-switch inductor Boost converter, including a DC voltage source V in , diodes D0 to D9, output capacitor C0, power switch S, and inductors L1 to L4; the voltage across the output capacitor C0 serves as the output voltage V0 of the Boost converter;

[0025] DC voltage source V in The positive electrode of is connected to the anode of diode D4, one end of inductor L1 and the anode of diode D1 at the same time, the anode of diode D2 is connected to the other end of inductor L1 and the anode of diode D3 at the same time, the cathode of diode D2 is connected to one end of inductor L2 and the cathode of diode D1 at the same time, the anode of diode D5 is connected to the cathode of diode D3, the anode of diode D6 and the other end of inductor L2 at the same time, the anode of diode D7 is connected to the cathode of diode D5, the cathode of diode D4 and one end of inductor L3 at the same time, the anode of diode D8 is connected to the other end of inductor L3 and the anode of diode D9 at the same time, the cathode of diode D8 is connected to the cathode of diode D7 and one end of inductor L4 at the same time, the cathode of diode D6 is connected to the other end of inductor L4, the cathode of diode D9, the anode of diode D0 and the drain of power switch S at the same time, the cathode of diode D0 is connected to one end of output capacitor C0 and one end of load resistor R at the same time,

[0026] DC voltage source V in The negative electrode of is connected to the source of the power switch S, the other end of the output capacitor C0 and the other end of the load resistor R at the same time.

[0027] The dual-switch inductor Boost converter proposed in this embodiment has a DC voltage source V in Directly connecting the inductor L1 makes the input current continuous, which can continuously provide relatively stable energy to the circuit. The voltage of the diode D1 and the diode D5 is much lower than the output voltage, and the current of the inductor L1 and the inductor L4 does not fluctuate greatly, which reduces energy loss, reduces component voltage stress, and reduces circuit current ripple. At the same time, it meets the requirements of fast transient response and adjusts the circuit's duty cycle to optimize performance, thereby improving energy conversion efficiency and boost capability.

[0028] The connection relationship of the components of the dual-switch inductor Boost converter greatly reduces the voltage stress at both ends of the diode and increases the service life of the components.

[0029] Specifically, the output capacitor C0, the diode D0 and the load resistor R constitute the output unit of the dual-switch inductor Boost converter.

[0030] Furthermore, the voltage gain of the Boost converter D is the on-duty cycle of the power switch S. The on-duty cycle adjustment range of the power switch S is (0,1). In specific applications, the optimal on-duty cycle of the power switch S is 0.4.

[0031] In this preferred embodiment, it can be seen from the voltage gain expression that the on-duty ratio can be adjusted in a wide range and the voltage gain is large. The on-duty ratio of the power switch tube S has a wide adjustment range and can be used in many occasions.

[0032] The Boost converter has two operating modes in one switching cycle, namely the on state and the off state. Figure 2 Specifically,

[0033] See also Figure 2 a. In the on-state working mode, the power switch tube S is turned on, and the DC voltage source V in The inductor L2 is charged through the diode D1, and the DC voltage source V in Directly connect the inductor L1, the diode D2 is reverse biased and cut off, and D3 is forward biased and turned on; at the same time, the DC voltage source V in The inductors L3 and L4 are charged through the diode D4, and the diodes D7 and D9 are forward biased and turned on, the diodes D5 and D8 are reverse biased and turned off, the diode D0 is reverse biased and turned off, and the output capacitor C0 supplies power to the load resistor R independently.

[0034] See also Figure 2 b. In the off-state operating mode, the power switch tube S remains off, the diodes D1, D3, D4, D6, D7 and D9 are reverse biased and cut off, and the diodes D2, D5, D8 and D0 are forward biased and turned on. At the same time, the DC voltage source V in The output electric energy sequentially passes through inductors L1 to L4 and diode D0 to supply power to load resistor R and output capacitor C0.

[0035] In this preferred embodiment, the two working modes optimize the voltage distribution, avoid the situation where the components are always at high voltage, and improve the energy transfer efficiency.

[0036] Verification test:

[0037] like Figure 3 As shown, the input voltage V in =50V, output voltage V0 is about 183V, D=0.4, load resistance R=200Ω. Figure 3 a is the voltage V0 of the output capacitor C0, which is about 183V and the input voltage V in =50V waveform. Figure 3 b is the waveform diagram of the output diode D0 voltage peak value of about 183V and the power switch S voltage peak value of about 183V; Figure 3 c is a waveform comparison diagram of the current flowing through the inductor L1 and the current flowing through the inductor L4; Figure 3 d is the voltage waveform of diodes D1 and D5.

[0038] from Figure 3It can be seen from a that the dual-switch inductor Boost converter has a higher voltage output gain. Figure 3 From b to 3d, we can respectively draw the conclusion that the inductor current fluctuation is small, it can provide continuous current to the circuit, and the diode voltage stress is small, which further improves the service life of the component.

[0039] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A dual-switch inductor Boost converter, characterized in that: Including DC voltage source V in , diodes D0 to D9, output capacitor C0, power switch S, and inductors L1 to L4; the voltage across the output capacitor C0 serves as the output voltage V0 of the Boost converter; DC voltage source V in The positive electrode of is connected to the anode of diode D4, one end of inductor L1 and the anode of diode D1 at the same time, the anode of diode D2 is connected to the other end of inductor L1 and the anode of diode D3 at the same time, the cathode of diode D2 is connected to one end of inductor L2 and the cathode of diode D1 at the same time, the anode of diode D5 is connected to the cathode of diode D3, the anode of diode D6 and the other end of inductor L2 at the same time, the anode of diode D7 is connected to the cathode of diode D5, the cathode of diode D4 and one end of inductor L3 at the same time, the anode of diode D8 is connected to the other end of inductor L3 and the anode of diode D9 at the same time, the cathode of diode D8 is connected to the cathode of diode D7 and one end of inductor L4 at the same time, the cathode of diode D6 is connected to the other end of inductor L4, the cathode of diode D9, the anode of diode D0 and the drain of power switch S at the same time, the cathode of diode D0 is connected to one end of output capacitor C0 and one end of load resistor R at the same time, DC voltage source V in The negative electrode of is connected to the source of the power switch S, the other end of the output capacitor C0 and the other end of the load resistor R at the same time.

2. The dual-switch inductor Boost converter according to claim 1, characterized in that: Voltage Gain of Boost Converter D is the on-duty cycle of the power switch S.

3. The dual-switch inductor Boost converter according to claim 1, characterized in that: The Boost converter has two operating modes in one switching cycle, namely the on state and the off state.

4. The dual-switch inductor Boost converter according to claim 3, characterized in that: In the on-state operating mode, the power switch tube S is turned on and the DC voltage source V in The inductor L2 is charged through the diode D1, and the DC voltage source V in Directly connect the inductor L1, the diode D2 is reverse biased and cut off, and D3 is forward biased and turned on; at the same time, the DC voltage source V in The inductors L3 and L4 are charged through the diode D4, and the diodes D7 and D9 are forward biased and turned on, the diodes D5 and D8 are reverse biased and turned off, the diode D0 is reverse biased and turned off, and the output capacitor C0 supplies power to the load resistor R independently.

5. The dual-switch inductor Boost converter according to claim 3, characterized in that: In the off-state operating mode, the power switch tube S remains off, the diodes D1, D3, D4, D6, D7 and D9 are reverse biased and cut off, and the diodes D2, D5, D8 and D0 are forward biased and turned on. At the same time, the DC voltage source V in The output electric energy sequentially passes through inductors L1 to L4 and diode D0 to supply power to load resistor R and output capacitor C0.

6. The dual-switch inductor Boost converter according to claim 1, characterized in that: The on-duty cycle adjustment range of the power switch tube S is (0,1).

7. The dual-switch inductor Boost converter according to claim 1, characterized in that: The optimal conduction duty cycle of the power switch tube S is 0.4.

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