A boost type high-power DC-DC converter

Abstract

The utility model discloses a kind of boost type high-power DC-DC converters, including input filter circuit, input filter circuit rear end is sequentially connected with full-bridge conversion circuit, quasi-resonant circuit and rectifier filter circuit;Input filter circuit includes electric input voltage source Vin, input filter capacitor C1~C4, input voltage source Vin anode is connected with input filter capacitor C1~C4 anode respectively, input voltage source Vin cathode is connected with input filter capacitor C1~C4 cathode respectively, input voltage source Vin cathode is also grounded;Adopt quasi-resonant soft-switching full-bridge circuit, switching tube loss is small, promote power in limited space, improve efficiency, reduce cost;Make switching tube work in zero current (ZCS) opening and off mode in each drive cycle, reduce the heat output of switching tube, also reduce heat dissipation burden for high-power design simultaneously.

Description

Technical Field

[0001] This utility model relates to a switching power supply technology, and more particularly to a boost-type high-power DC-DC converter. Background Technology

[0002] Currently, uninterruptible power supply (UPS) systems are widely used in communications, power, and finance sectors. They primarily consist of UPS units, battery banks, and distribution boxes. The UPS main unit needs to perform mains voltage regulation and conversion, as well as battery bank inverter functions, to output clean and reliable high-power AC power. The battery bank's supply voltage is relatively low and cannot be directly used by downstream inverter units or loads. A DC-DC converter is needed to boost the voltage to a certain level to meet the power requirements of downstream units, providing a stable and uninterrupted power supply and protecting load equipment from voltage fluctuations and power pollution. In the event of a power outage, it also provides a certain amount of emergency time, allowing users to save data and safely shut down equipment.

[0003] Traditional boost DC-DC converters are limited by losses during the switching process of the switching transistors, with switching frequencies typically between 30kHz and 40kHz. They also require timely heat dissipation, resulting in relatively large power devices. This makes it difficult to achieve high efficiency and power boost within a limited size. During prolonged high-power operation, overheating may occur, affecting the converter's performance and reliability.

[0004] In view of the above, this utility model is hereby proposed. Utility Model Content

[0005] The purpose of this invention is to provide a boost-type high-power DC-DC converter to solve the aforementioned technical problems in the prior art.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] The boost-type high-power DC-DC converter of this utility model includes an input filter circuit, and a full-bridge converter circuit, a quasi-resonant circuit and a rectifier filter circuit are connected sequentially at the rear end of the input filter circuit.

[0008] The input filtering circuit includes an input voltage source Vin and input filtering capacitors C1 to C4. The positive terminal of the input voltage source Vin is connected to the positive terminals of the input filtering capacitors C1 to C4, and the negative terminal of the input voltage source Vin is connected to the negative terminals of the input filtering capacitors C1 to C4. The negative terminal of the input voltage source Vin is also grounded.

[0009] The full-bridge converter circuit includes switching transistors M1~M16, transformers T1~T4, push-pull quasi-resonant controller U0, and gate drivers US1~US8.

[0010] Compared with existing technologies, the boost-type high-power DC-DC converter provided by this utility model adopts a quasi-resonant soft-switching full-bridge circuit. The switch switches when the current is zero, reducing the losses caused by switching. The switching frequency can reach up to 70kHz, and the switching transistor loss is low. It increases power, improves efficiency, and reduces costs within a limited space. In each drive cycle, the switching transistor operates in zero-current (ZCS) turn-on and turn-off mode, reducing the heat generation of the switching transistor and alleviating the heat dissipation burden in high-power designs. This solves the technical difficulties and achieves the goals of improving efficiency, reliability, and reducing costs. Attached Figure Description

[0011] Figure 1 A schematic diagram of a boost-type high-power DC-DC converter circuit provided for an embodiment of this utility model.

[0012] Figure 2 for Figure 1 Block diagram of gate drive principle of full-bridge converter circuit. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments, which do not constitute a limitation on the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0014] First, the following explanations are provided for the terms that may be used in this article:

[0015] The terms “including,” “contains,” “comprising,” “having,” or other similar semantic descriptions shall be interpreted as non-exclusive inclusion.

[0016] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0017] The contents not described in detail in the embodiments of this utility model are existing technologies known to those skilled in the art. Where specific conditions are not specified in the embodiments of this utility model, they shall be performed according to conventional conditions in the art or conditions recommended by the manufacturer. Reagents or instruments used in the embodiments of this utility model whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0018] The boost-type high-power DC-DC converter of this utility model includes an input filter circuit, and a full-bridge converter circuit, a quasi-resonant circuit and a rectifier filter circuit are connected sequentially at the rear end of the input filter circuit.

[0019] The input filtering circuit includes an input voltage source Vin and input filtering capacitors C1 to C4. The positive terminal of the input voltage source Vin is connected to the positive terminals of the input filtering capacitors C1 to C4, and the negative terminal of the input voltage source Vin is connected to the negative terminals of the input filtering capacitors C1 to C4. The negative terminal of the input voltage source Vin is also grounded.

[0020] The full-bridge converter circuit includes switching transistors M1~M16, transformers T1~T4, push-pull quasi-resonant controller U0, and gate drivers US1~US8.

[0021] The drains of switching transistors M1 and M3 are both connected to the positive terminal of the input filter capacitor C1; the drains of switching transistors M5 and M7 are both connected to the positive terminal of the input filter capacitor C2; the drains of switching transistors M9 and M115 are both connected to the positive terminal of the input filter capacitor C3; and the drains of switching transistors M13 and M15 are both connected to the positive terminal of the input filter capacitor C4.

[0022] The drain of switch M2 is connected to the source of switch M1 and pin 1 of transformer T1, respectively; the drain of switch M4 is connected to the source of switch M3 and pin 2 of transformer T1, respectively.

[0023] The drain of switch M6 is connected to the source of switch M5 and pin 1 of transformer T2, respectively; the drain of switch M8 is connected to the source of switch M7 and pin 2 of transformer T2, respectively.

[0024] The drain of switch M10 is connected to the source of switch M9 and pin 1 of transformer T3, respectively; the drain of switch M12 is connected to the source of switch M11 and pin 2 of transformer T3, respectively.

[0025] The drain of switch M14 is connected to the source of switch M13 and pin 1 of transformer T4, respectively; the drain of switch M16 is connected to the source of switch M15 and pin 2 of transformer T4, respectively.

[0026] The sources of switching transistors M2, M4, M6, M8, M10, M12, M14, and M16 are all grounded.

[0027] Pin 4 of transformer T1 is connected to pin 3 of transformer T2, pin 4 of transformer T2 is connected to pin 3 of transformer T3, and pin 4 of transformer T3 is connected to pin 3 of transformer T4.

[0028] The PWMH output terminal of the push-pull quasi-resonant controller U0 is connected to the HIN terminal of gate driver US1, the LIN terminal of gate driver US2, the HIN terminal of gate driver US3, the LIN terminal of gate driver US4, the HIN terminal of gate driver US5, the LIN terminal of gate driver US6, the HIN terminal of gate driver US7, and the LIN terminal of gate driver US8, respectively. The PWML output terminal of the push-pull quasi-resonant controller U0 is connected to the LIN terminal of gate driver US1, the HIN terminal of gate driver US2, the LIN terminal of gate driver US3, the HIN terminal of gate driver US4, the LIN terminal of gate driver US5, the HIN terminal of gate driver US6, the LIN terminal of gate driver US7, and the HIN terminal of gate driver US8, respectively.

[0029] The HO terminal of gate driver US1 is connected to the gate of switch M1, and the LO terminal is connected to the gate of switch M2. The HO terminal of gate driver US2 is connected to the gate of switch M3, and the LO terminal is connected to the gate of switch M4. The HO terminal of gate driver US3 is connected to the gate of switch M5, and the LO terminal is connected to the gate of switch M6. The HO terminal of gate driver US4 is connected to the gate of switch M7, and the LO terminal is connected to the gate of switch M8. The HO terminal of gate driver US5 is connected to the gate of switch M9, and the LO terminal is connected to the gate of switch M10. The HO terminal of gate driver US6 is connected to the gate of switch M11, and the LO terminal is connected to the gate of switch M12. The HO terminal of gate driver US7 is connected to the gate of switch M13, and the LO terminal is connected to the gate of switch M14. The HO terminal of gate driver US8 is connected to the gate of switch M15, and the LO terminal is connected to the gate of switch M16.

[0030] The quasi-resonant circuit includes a resonant inductor L0 and a resonant capacitor C0, which are connected in series. Pin 1 of the resonant inductor is connected to pin 3 of the transformer T1.

[0031] The rectifier and filter circuit includes diodes D1 to D4 and an output filter capacitor C6. The cathode of diode D1 is connected to the cathode of diode D3 and the positive terminal of output filter capacitor C6, respectively. The anode of diode D2 is connected to the anode of diode D4 and the negative terminal of output filter capacitor C6, respectively. The anode of diode D1 is connected to the cathode of diode D2 and pin 2 of resonant capacitor C0, respectively. The anode of diode D3 is connected to the cathode of diode D4 and pin 4 of transformer T4, respectively.

[0032] In summary, the boost-type high-power DC-DC converter of this utility model can reduce losses caused by switching, increase converter power within a limited space, improve efficiency and reliability, and reduce costs, thereby solving the aforementioned problems existing in the prior art.

[0033] Compared with existing technologies, the boost-type high-power DC-DC converter of this invention adopts a quasi-resonant soft-switching full-bridge circuit. The switch switches when the current is zero, reducing the losses caused by switching. The switching frequency can reach up to 70kHz, and the switching transistor loss is low. It increases power, improves efficiency, and reduces costs within a limited space. In each drive cycle, the switching transistor operates in zero-current (ZCS) turn-on and turn-off mode, reducing the heat generation of the switching transistor and alleviating the heat dissipation burden in high-power designs. This solves the technical difficulties and achieves the goals of improving efficiency, reliability, and reducing costs.

[0034] To more clearly demonstrate the technical solution and effects provided by this utility model, the following detailed description of the embodiments of this utility model is provided with reference to specific examples.

[0035] Example 1

[0036] like Figure 1 , Figure 2 As shown:

[0037] Reference Figure 1 A boost-type high-power DC-DC converter includes an input filter circuit 10, a full-bridge converter circuit 20, a quasi-resonant circuit 30, and a rectifier filter circuit 40.

[0038] The input filter circuit 10 is connected in sequence to a full-bridge converter circuit 20, a quasi-resonant circuit 30, and a rectifier filter circuit 40.

[0039] The input filtering circuit 10 includes an input voltage source Vin and input filtering capacitors C1 to C4. The positive terminal of the input voltage source Vin is connected to the positive terminals of the input filtering capacitors C1, C2, C3, and C4, respectively, and the negative terminal of the input voltage source Vin is connected to the negative terminals of the input filtering capacitors C1, C2, C3, and C4, respectively. The voltage range of the input voltage source Vin is DC 18~28V. The input filtering capacitors C1~C4 are selected as 10mF large capacitors, which serve to filter the input voltage source and store energy.

[0040] The full-bridge converter circuit 20 includes switching transistors M1-M16, transformers T1-T4, a push-pull quasi-resonant controller U0, and gate drivers US1-US8. The circuit topology employs a full-bridge isolated boost converter, transforming the battery-supplied DC 18-28V into a 310V-400V high-voltage DC bus voltage. Switches M1-M4, M5-M8, M9-M12, and M13-M16 each form four full-bridge circuits, connected to the front stage of transformers T1-T4 respectively. The rear stages of transformers T1-T4 are connected in series, further enhancing the converter's load-carrying capacity.

[0041] Reference Figure 2 As shown, the PWMH output terminal of the push-pull quasi-resonant controller U0 is connected to the HIN terminal of gate driver US1, the LIN terminal of gate driver US2, the HIN terminal of gate driver US3, the LIN terminal of gate driver US4, the HIN terminal of gate driver US5, the LIN terminal of gate driver US6, the HIN terminal of gate driver US7, and the LIN terminal of gate driver US8, respectively. The PWML output terminal of the push-pull quasi-resonant controller U0 is connected to the LIN terminal of gate driver US1, the HIN terminal of gate driver US2, the LIN terminal of gate driver US3, the HIN terminal of gate driver US4, the LIN terminal of gate driver US5, the HIN terminal of gate driver US6, the LIN terminal of gate driver US7, and the HIN terminal of gate driver US8, respectively. The push-pull quasi-resonant controller U0 uses the domestically produced chip EG1611, which can generate a complementary PWM signal with a frequency of 70kHz, a duty cycle of 50%, and a dead time of 500ns for both upper and lower transistors. This signal is output to gate drivers US1~US8, and the driving capability is enhanced after amplification of the drive signal.

[0042] The gate drivers US1~US8 use the domestically produced EG2132 chip, which features dead-time control and level conversion functions. The maximum sink current of the high-side upper bridge arm and the low-side lower bridge arm output drivers can reach 1.5A and the maximum output current can reach 1A. The high-side upper bridge arm channel can withstand a voltage of 300V, and the conduction delay between the input logic signal and the output control signal is small.

[0043] The quasi-resonant circuit 30 includes a resonant inductor L0 and a resonant capacitor C0, which form a series resonance. During debugging, the PWM frequency of the push-pull quasi-resonant controller U0 is adjusted to correspond to the resonant points of L0 and C0, enabling the full-bridge converter circuit to achieve zero-current switching (ZCS). The switch switches when the current is zero, reducing the losses caused by switching.

[0044] The resonant frequency is calculated using the formula:

[0045] (1)

[0046] L0 includes the leakage inductance of the transformer.

[0047] The rectifier-filter circuit 40 includes diodes D1-D4 and an output filter capacitor C6. The cathode of diode D1 is connected to the cathode of diode D3 and the positive terminal of output filter capacitor C6, respectively. The anode of diode D2 is connected to the anode of diode D4 and the negative terminal of output filter capacitor C6, respectively. The anode of diode D1 is connected to the cathode of diode D2 and pin 2 of resonant capacitor C0, respectively. The anode of diode D3 is connected to the cathode of diode D4 and pin 4 of transformer T4, respectively. The output rectifier bridge, composed of diodes D1-D4, provides a relatively smooth DC high voltage after filtering by capacitor C6.

[0048] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims. The information disclosed in the background section is intended only to enhance the understanding of the overall background technology of this utility model and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art.

Claims

1. A boost-type high-power DC-DC converter, characterized in that, The circuit includes an input filter circuit, and the input filter circuit is connected in sequence to a full-bridge converter circuit, a quasi-resonant circuit, and a rectifier filter circuit. The input filtering circuit includes an input voltage source Vin and input filtering capacitors C1 to C4. The positive terminal of the input voltage source Vin is connected to the positive terminals of the input filtering capacitors C1 to C4, and the negative terminal of the input voltage source Vin is connected to the negative terminals of the input filtering capacitors C1 to C4. The negative terminal of the input voltage source Vin is also grounded. The full-bridge converter circuit includes switching transistors M1~M16, transformers T1~T4, push-pull quasi-resonant controller U0, and gate drivers US1~US8.

2. The boost-type high-power DC-DC converter according to claim 1, characterized in that, The drains of switching transistors M1 and M3 are both connected to the positive terminal of the input filter capacitor C1; the drains of switching transistors M5 and M7 are both connected to the positive terminal of the input filter capacitor C2; the drains of switching transistors M9 and M115 are both connected to the positive terminal of the input filter capacitor C3; and the drains of switching transistors M13 and M15 are both connected to the positive terminal of the input filter capacitor C4. The drain of switch M2 is connected to the source of switch M1 and pin 1 of transformer T1, respectively; the drain of switch M4 is connected to the source of switch M3 and pin 2 of transformer T1, respectively. The drain of switch M6 is connected to the source of switch M5 and pin 1 of transformer T2, respectively; the drain of switch M8 is connected to the source of switch M7 and pin 2 of transformer T2, respectively. The drain of switch M10 is connected to the source of switch M9 and pin 1 of transformer T3, respectively; the drain of switch M12 is connected to the source of switch M11 and pin 2 of transformer T3, respectively. The drain of switch M14 is connected to the source of switch M13 and pin 1 of transformer T4, respectively; the drain of switch M16 is connected to the source of switch M15 and pin 2 of transformer T4, respectively. The sources of switching transistors M2, M4, M6, M8, M10, M12, M14, and M16 are all grounded.

3. The boost-type high-power DC-DC converter according to claim 2, characterized in that, Pin 4 of transformer T1 is connected to pin 3 of transformer T2, pin 4 of transformer T2 is connected to pin 3 of transformer T3, and pin 4 of transformer T3 is connected to pin 3 of transformer T4.

4. The boost-type high-power DC-DC converter according to claim 3, characterized in that, The PWMH output terminal of the push-pull quasi-resonant controller U0 is connected to the HIN terminal of gate driver US1, the LIN terminal of gate driver US2, the HIN terminal of gate driver US3, the LIN terminal of gate driver US4, the HIN terminal of gate driver US5, the LIN terminal of gate driver US6, the HIN terminal of gate driver US7, and the LIN terminal of gate driver US8, respectively. The PWML output terminal of the push-pull quasi-resonant controller U0 is connected to the LIN terminal of gate driver US1, the HIN terminal of gate driver US2, the LIN terminal of gate driver US3, the HIN terminal of gate driver US4, the LIN terminal of gate driver US5, the HIN terminal of gate driver US6, the LIN terminal of gate driver US7, and the HIN terminal of gate driver US8, respectively.

5. The boost-type high-power DC-DC converter according to claim 4, characterized in that, The HO terminal of gate driver US1 is connected to the gate of switch M1, and the LO terminal is connected to the gate of switch M2. The HO terminal of gate driver US2 is connected to the gate of switch M3, and the LO terminal is connected to the gate of switch M4. The HO terminal of gate driver US3 is connected to the gate of switch M5, and the LO terminal is connected to the gate of switch M6. The HO terminal of gate driver US4 is connected to the gate of switch M7, and the LO terminal is connected to the gate of switch M8. The HO terminal of gate driver US5 is connected to the gate of switch M9, and the LO terminal is connected to the gate of switch M10. The HO terminal of gate driver US6 is connected to the gate of switch M11, and the LO terminal is connected to the gate of switch M12. The HO terminal of gate driver US7 is connected to the gate of switch M13, and the LO terminal is connected to the gate of switch M14. The HO terminal of gate driver US8 is connected to the gate of switch M15, and the LO terminal is connected to the gate of switch M16.

6. The boost-type high-power DC-DC converter according to claim 5, characterized in that, The quasi-resonant circuit includes a resonant inductor L0 and a resonant capacitor C0, which are connected in series. Pin 1 of the resonant inductor is connected to pin 3 of the transformer T1.

7. The boost-type high-power DC-DC converter according to claim 6, characterized in that, The rectifier and filter circuit includes diodes D1 to D4 and an output filter capacitor C6. The cathode of diode D1 is connected to the cathode of diode D3 and the positive terminal of output filter capacitor C6, respectively. The anode of diode D2 is connected to the anode of diode D4 and the negative terminal of output filter capacitor C6, respectively. The anode of diode D1 is connected to the cathode of diode D2 and pin 2 of resonant capacitor C0, respectively. The anode of diode D3 is connected to the cathode of diode D4 and pin 4 of transformer T4, respectively.

Images