Wide-range input boost closed-loop regulation circuit

Abstract

The utility model discloses a wide range input boost closed loop regulation circuit, including inversion module, transformer, resonance module, rectifier module and controller, direct current power supply connects inversion module's input terminal, inversion module's output terminal connects the primary coil of transformer, transformer's secondary coil connects resonance module's input terminal, rectifier module and controller, and inversion module's output terminal connects the primary coil of transformer. The output end of the resonance module is connected with the input end of the rectification module, the output end of the rectification module is connected with the controller, and the output end of the controller is connected with the inversion module. The resonance frequency is calculated by combining the leakage inductance of the transformer and the resonance module, and the resonance frequency can convert alternating voltage into direct voltage through the rectification module. The rectifier module is connected with the inverter module after passing through the controller, the resonant frequency serves as a soft switch of the inverter module, stable control voltage is provided for the inverter module to control on and off of an MOS tube in the inverter module, and the purpose of voltage stabilization by adjusting the duty ratio of the MOS tube can be achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of DC power supplies, specifically to a wide-range input boost closed-loop regulation circuit. Background Technology

[0002] A DC-DC converter, also known as a DC-DC power supply, is a device that converts DC power into DC (or near-DC) power at different voltages. Its power range can be very wide, from small to very large, and it is widely used in electronic equipment, communication equipment, and industrial control systems. A DC-DC power supply not only converts one DC voltage to another, but also outputs a stable DC voltage unaffected by input voltage fluctuations and load changes.

[0003] DC-DC boost converters provide a lower DC voltage to the battery and boost it to the required voltage value, and are commonly used devices in the market. However, when the input range of a DC-DC boost converter is wide, the output often varies greatly, making it difficult to achieve a regulated output. To achieve output voltage regulation, hard switching is often used. However, hard switching leads to low efficiency, exacerbates the difficulty of heat dissipation systems, and also causes significant interference with electromagnetic compatibility (EMC) regulations. Therefore, there is an urgent need for a wide-range input boost closed-loop regulation circuit with regulated output. Utility Model Content

[0004] The summary section of this utility model is intended to briefly introduce the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0005] To address the problems and shortcomings of existing technologies, this invention provides a wide-range input boost closed-loop regulation circuit. It utilizes a resonant module combined with a transformer to obtain the resonant frequency, which is then used as a soft switch for the MOSFETs within the inverter module. This soft switching allows for adjustment of the MOSFETs' duty cycle, thereby achieving stable control of the output voltage. This solves the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model provides the following technical solution: It includes a DC power supply connected to the input terminal of an inverter module, the output terminal of the inverter module connected to the primary coil of a transformer, the secondary coil of the transformer connected to the input terminal of a resonant module, the output terminal of the resonant module connected to the input terminal of a rectifier module, the output terminal of the rectifier module connected to a controller, and the output terminal of the controller connected to the inverter module. The DC power supply provides DC voltage to the inverter module, which converts it into pulse-width modulated AC voltage. The AC voltage is amplified by the transformer and combined with the resonant module to obtain a resonant frequency. The resonant frequency serves as a soft switch for the inverter module, controlling and adjusting the duty cycle of the inverter module to achieve voltage regulation.

[0007] Preferably, the inverter module includes an inverter bridge composed of four MOSFETs. The positive terminal of the DC power supply is connected to the drain of MOSFETs Q1 and Q2, the source of MOSFETs Q1 and Q2 is connected to the drain of MOSFETs Q3 and Q4, the gate of MOSFETs Q1, Q2, Q3 and Q4 is connected to the controller, and the source of MOSFETs Q3 and Q4 is connected to the negative terminal of the DC power supply.

[0008] Preferably, the resonant module includes a resonant inductor and a resonant capacitor connected to each other, with one end of the resonant inductor connected to the secondary coil of the transformer.

[0009] Preferably, the rectifier module includes a rectifier bridge composed of four rectifier diodes. The input terminal of the rectifier bridge is connected between the resonant capacitor and the secondary coil of the transformer. The output terminal of the rectifier bridge is connected in parallel with a filter capacitor and a voltage divider resistor, and one end of the voltage divider resistor is connected to the controller.

[0010] Preferably, the controller is model SG3525AP013TR. The controller uses STMicroelectronics' SG3525AP013TR. The SG3525AP013TR controller is a high-efficiency, energy-saving, and high-performance power management chip that features latched PWM to prevent multiple pulses, enhancing system stability and reliability. It also features adjustable pause time control, providing additional control flexibility.

[0011] Preferably, the MOSFET is model NCEP023N10T. The MOSFET used is the NCEP023N10T from Wuxi Xinjieneng Technology Co., Ltd. The NCEP023N10T is a power MOSFET that utilizes uniquely optimized Super Trench II technology, enabling it to provide the most efficient high-frequency switching performance, extremely low conduction and switching power losses, and is particularly suitable for high-frequency switching and synchronous rectification.

[0012] Compared with the prior art, the beneficial effects provided by this utility model are:

[0013] This invention provides a wide-range input boost closed-loop regulation circuit, comprising a DC power supply, an inverter module, a transformer, a resonant module, a rectifier module, and a controller. The DC power supply is connected to the inverter module to provide DC voltage and current. The input DC voltage is converted into pulse-width modulated (PWM) AC voltage by the inverter module, and the modulated AC voltage is sent to the transformer for amplification. After amplification, the resonant frequency is calculated using the transformer's leakage inductance and the resonant module. The resonant frequency is then converted back to DC voltage by the rectifier module. The rectifier module is connected to the inverter module via the controller. The resonant frequency acts as a soft switch for the inverter module, providing a stable control voltage to control the conduction and cutoff of the MOSFETs in the inverter module, thus enabling adjustment of the MOSFET's duty cycle to achieve voltage regulation. Therefore, when a wide input range is encountered, the DC boost DC-DC converter can maintain a relatively stable output. Attached Figure Description

[0014] Figure 1 This is a connection block diagram of a wide-range input boost closed-loop regulation circuit according to the present invention;

[0015] Figure 2 This is a circuit diagram of a wide-range input boost closed-loop regulation circuit according to the present invention. Detailed Implementation

[0016] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0017] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0018] Example

[0019] This embodiment provides a wide-range input boost closed-loop regulation circuit, referring to... Figure 1As shown, this utility model includes a DC power supply, an inverter module, a transformer, a resonant module, a rectifier module, and a controller. The output terminal of the DC power supply is connected to the input terminal of the inverter module, the output terminal of the inverter module is connected to the primary coil of the transformer, the secondary coil of the transformer is connected to the input terminal of the resonant module, the output terminal of the resonant module is connected to the input terminal of the rectifier module, the output terminal of the rectifier module is connected to the input terminal of the controller, and finally, the output terminal of the controller is connected to the inverter module.

[0020] A DC power supply connects to an inverter module to provide DC voltage. The input DC voltage is converted into pulse-width modulated (PWM) AC voltage by the inverter module. The modulated AC voltage is then sent to a transformer for amplification. After amplification, the resonant frequency is calculated using the transformer's leakage inductance and a resonant module. This resonant frequency is then converted back to DC voltage by a rectifier module. The rectifier module connects to a controller, which in turn connects to the inverter module, providing a stable control voltage to control the on / off state of the MOSFETs within the inverter module. This allows for voltage regulation by adjusting the MOSFET's duty cycle. In other words, the duty cycle is achieved through pulse-width modulation (PWM) technology. The duty cycle represents the proportion of the MOSFET's on-time to the entire switching cycle; adjusting this proportion allows for precise control of the circuit performance.

[0021] Reference Figure 2 As shown, the inverter module includes an inverter bridge composed of four MOSFETs, represented as MOSFETs Q1, Q3, Q2, and Q4. The resonant module includes a resonant inductor L1 and a resonant capacitor C1. The rectifier module includes a rectifier bridge composed of four rectifier diodes, represented as rectifier diodes D1, D2, D3, and D4, and also includes a filter capacitor C2 and two voltage divider resistors R1 and R2.

[0022] The positive terminal of the DC power supply is connected to the drain of MOSFETs Q1 and Q2. The gates of MOSFETs Q1 and Q2 are connected to the controller. The sources of MOSFETs Q1 and Q2 are connected to the drain of MOSFETs Q3 and Q4. The gates of MOSFETs Q3 and Q4 are connected to the controller. The sources of MOSFETs Q3 and Q4 are connected to the negative terminal of the DC power supply. The primary winding of transformer T1 is connected between MOSFETs Q1 and Q3, and between MOSFETs Q2 and Q4. One end of the secondary winding of transformer T1 is connected to resonant inductor L1 and resonant capacitor C1. Rectifier diodes D1, D2, D3, and D4 are connected to form a rectifier bridge. The resonant capacitor C1 and the secondary winding of transformer T1 are connected to the input terminal of the rectifier bridge; that is, one end of resonant capacitor C1 is connected between rectifier diodes D1 and D3, and the other end of the secondary winding of transformer T1 is connected between rectifier diodes D2 and D4. A filter capacitor C2 is connected in parallel to the output of the rectifier bridge, and voltage divider resistors R1 and R2 are also connected in parallel. The controller is then connected to point M between voltage divider resistors R1 and R2.

[0023] The resonant frequency f can be calculated by adding the leakage inductance of transformer T1, the resonant inductance L1, and the resonant capacitor C1. The switching frequency of the MOSFETs in the inverter module is then controlled by the controller. Since the MOSFET switching frequency is equal to the resonant frequency f, an initial duty cycle of 50% achieves soft switching. When the input voltage is too high, since the transformer turns ratio remains unchanged, the duty cycle of the MOSFETs needs to be appropriately adjusted to stabilize the output voltage.

[0024] Specific implementation effects

[0025] The following is an input boost closed-loop regulation circuit designed using this utility model, with an input range of DC 20V~30V and an output of 360V. Refer to the specific wiring method. Figure 2 As shown. The DC power supply is adjustable from 20V to 30V. The MOSFET is NCEP023N10T from Wuxi Xinjieneng Technology Co., Ltd. The controller is SG3525AP013TR from STMicroelectronics. The transformer T1 has a 1:18 turns ratio and a leakage inductance of 22uH. The resonant inductor L1 is 54uH and the resonant capacitor C1 is 68nF.

[0026] The resonant frequency is calculated to be... The output of the regulating controller SG3525AP013TR is 70kHz. MOSFETs Q1 and Q4 share the same control signal, as do MOSFETs Q2 and Q3, and these signals are complementary to those of MOSFETs Q1 and Q4. The initial duty cycle is 50%. When the input voltage is 20V, the output is 360V due to the 1:18 turns ratio of transformer T1, requiring no duty cycle adjustment. Simultaneously, the resonance keeps the MOSFETs in a soft-switching state, reducing switching losses. When the input is 30V, the output is 540V due to the 1:18 turns ratio, requiring a duty cycle adjustment to 33.3%. Since the switching frequency remains at the resonant frequency, it still functions as a soft switch, thus achieving voltage regulation.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, in this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0029] The above are merely preferred embodiments of this utility model, and other embodiments are also possible. Those skilled in the art can still modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wide range input boost closed loop regulation circuit comprising a DC power supply, characterized by: The direct current power supply is connected with the input end of the inverter module, the output end of the inverter module is connected with the primary coil of the transformer, the secondary coil of the transformer is connected with the input end of the resonance module, and the output end of the resonance module is connected with the input end of the rectifier module, the output end of the rectifier module is connected with the controller, and the output end of the controller is connected with the inverter module; the direct current power supply provides direct current voltage for the inverter module, the direct current voltage is converted into pulse width modulation alternating current voltage through the inverter module, the alternating current voltage is amplified by the transformer, and the resonance frequency is obtained by combining the resonance module, the resonance frequency is used as the soft switch of the inverter module, the duty cycle of the inverter module is controlled and adjusted, and voltage stabilization is realized.

2. A wide-range input boost closed-loop regulation circuit according to claim 1, wherein: The inverter module comprises an inverter bridge composed of four MOS tubes, the positive electrode end of the direct current power supply is connected with the drain of MOS tubes Q1 and Q2, the source of the MOS tubes Q1 and Q2 is connected with the drain of MOS tubes Q3 and Q4, the gate of the MOS tubes Q1, Q2, Q3 and Q4 is connected with the controller, and the source of the MOS tubes Q3 and Q4 is connected with the negative electrode end of the direct current power supply.

3. A wide-range input boost closed-loop regulation circuit according to claim 2, wherein: The resonance module comprises a resonance inductor and a resonance capacitor connected with each other, and one end of the resonance inductor is connected with the secondary coil of the transformer.

4. A wide-range input boost closed-loop regulation circuit according to claim 3, wherein: The rectifier module comprises a rectifier bridge composed of four rectifier diodes, the input end of the rectifier bridge is connected between the resonance capacitor and the secondary coil of the transformer, the output end of the rectifier bridge is connected with a filter capacitor and a voltage dividing resistor in parallel, and one end of the voltage dividing resistor is connected with the controller.

5. A wide-range input boost closed-loop regulation circuit according to claim 4, wherein: The controller adopts SG3525AP013TR.

6. A wide-range input boost closed-loop regulation circuit according to claim 4, wherein: The MOS tube adopts NCEP023N10T.

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