Multipurpose low-cost DC buck-boost converter

Abstract

The utility model discloses a multipurpose low-cost DC buck-boost converter, and relates to the field of voltage conversion, the multipurpose low-cost DC buck-boost converter comprises a voltage detection module used for detecting the voltage output by power supply equipment, and the power supply equipment comprises a solar energy input power supply and a generator input power supply; the capacitor filtering energy storage module is used for filtering the voltage output by the power supply equipment and then outputting the filtered voltage to the buck-boost control module; the buck-boost control module is used for controlling the conduction condition of the switch tube based on the PWM signal, so that the input voltage is output after being boosted or reduced; compared with the prior art, the utility model has the beneficial effects that the wide voltage input is realized, and the highest input voltage can reach 100V; the voltage boosting and reducing capability is realized, and the use scene is flexible; the number of the MOS switch tubes can be designed according to the power and the output current, peripheral devices are few, and the cost is saved; output is stable and reliability is high.

Description

Technical Field

[0001] The utility model relates to the field of voltage conversion, and specifically to a multi-purpose and low-cost DC buck-boost converter. Background Art

[0002] At present, the application fields of DC power modules are constantly expanding. From traditional electronic products to emerging clean energy fields such as solar energy and wind energy, DC power modules have become the key technologies for converting these clean energies into practical applications. In addition, DC power modules also have the potential to be applied in the fields of data centers and the Internet of Things. Data centers are an indispensable part of today's Internet era, and they require a large amount of power supply. DC power modules can directly supply energy to data center equipment. The development momentum of the Internet of Things is also very rapid. DC power modules can be applied in Internet of Things devices to provide stable power supply, thus promoting the development of fields such as smart homes and smart cities.

[0003] Existing DC power modules often only have the function of boosting or bucking, with a narrow scope of application and need to be improved. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a multi-purpose and low-cost DC buck-boost converter to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A multi-purpose and low-cost DC buck-boost converter, comprising:

[0007] A voltage detection module for detecting the magnitude of the voltage output by the power supply device, where the power supply device includes solar input power supply and generator input power supply;

[0008] A capacitor filter energy storage module for filtering the voltage output by the power supply device and then outputting it to the buck-boost control module;

[0009] A buck-boost control module for controlling the conduction state of the switching tube based on the PWM signal so that the input voltage is boosted or bucked and then output;

[0010] A capacitor filter module for filtering the output voltage of the buck-boost control module;

[0011] The power supply device is connected to the voltage detection module and the capacitor filter energy storage module, the capacitor filter energy storage module is connected to the buck-boost control module, and the buck-boost control module is connected to the capacitor filter module.

[0012] As a further solution of the present utility model: The voltage detection module includes resistor R5, resistor R6, resistor R7, resistor R8, and capacitor C2. One end of resistor R5 introduces the output voltage of the power supply device. The other end of resistor R5 is connected to one end of resistor R6. The other end of resistor R6 is connected to one end of resistor R7 and one end of resistor R8. The other end of resistor R8 is grounded. The other end of resistor R7 is connected to one end of capacitor C2 and the MCU. The other end of capacitor C2 is grounded.

[0013] As a further solution of the present utility model: The capacitor filtering and energy storage module includes fuse F2, capacitor C25, and capacitor C3. One end of fuse F2 introduces the output voltage of the power supply device. The other end of fuse F2 is connected to one end of capacitor C25, one end of capacitor C3, and the buck-boost control module. The other end of capacitor C25 is grounded. The other end of capacitor C3 is grounded.

[0014] As a further solution of the present utility model: The buck-boost control module includes inductor L1 and four conduction control switches. The first end of the first conduction control switch is connected to the capacitor filtering and energy storage module. The second end of the first conduction control switch is connected to one end of inductor L1 and the first end of the second conduction control switch. The second end of the second conduction control switch is grounded. The other end of inductor L1 is connected to the second end of the third conduction control switch and the first end of the fourth conduction control switch. The first end of the third conduction control switch is connected to the capacitor filtering module. The second end of the fourth conduction control switch is grounded;

[0015] The conduction control switch includes MOS transistor Q5 and MOS transistor Q6. The D pole of MOS transistor Q5 is connected to the D pole of MOS transistor Q6 as the first end of the conduction control switch. The G pole of MOS transistor Q5 is connected to one end of resistor R32 and one end of resistor R35. The G pole of MOS transistor Q6 is connected to one end of resistor R37 and one end of resistor R40. The other end of resistor R32 is connected to the positive pole of diode D6. The negative pole of diode D6 is connected to the other end of resistor R35, the other end of resistor R40, the negative pole of diode D8, and signal PWM-1-H. The positive pole of diode D8 is connected to the other end of resistor R37. The S pole of MOS transistor Q5 is connected to the S pole of MOS transistor Q6, the other end of resistor R43, and signal PWM-1-L as the second end of the conduction control switch.

[0016] As a further solution of the present utility model: The multi-purpose and low-cost DC buck-boost converter further includes:

[0017] A current feedback module for detecting the magnitude of the output current of the buck-boost control module and feeding it back to the MCU;

[0018] A voltage feedback module for detecting the magnitude of the output voltage of the boost control module and feeding it back to the MCU;

[0019] The buck-boost control module is connected to the current feedback module and the voltage feedback module.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model has a wide voltage input, and the highest input voltage can reach 100V; it has both buck-boost capabilities, and the usage scenarios are flexible; the number of MOS switching tubes can be designed according to the power and the magnitude of the output current, with fewer peripheral devices, saving costs; the output is stable and the reliability is strong. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of a multi-purpose and low-cost DC buck-boost converter.

[0022] Figure 2 It is a circuit diagram of a multi-purpose and low-cost DC buck-boost converter. Detailed Embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0024] Please refer to Figure 1 , a multi-purpose and low-cost DC buck-boost converter, comprising:

[0025] A voltage detection module, which is used to detect the magnitude of the voltage output by the power supply device. The power supply device includes solar input power supply and generator input power supply;

[0026] A capacitor filtering and energy storage module, which is used to filter the voltage output by the power supply device and then output it to the buck-boost control module;

[0027] A buck-boost control module, which is used to control the conduction state of the switching tube based on the PWM signal, so that the input voltage is boosted or bucked and then output;

[0028] A capacitor filtering module, which is used to filter the output voltage of the buck-boost control module;

[0029] The power supply device is connected to the voltage detection module and the capacitor filtering and energy storage module. The capacitor filtering and energy storage module is connected to the buck-boost control module, and the buck-boost control module is connected to the capacitor filtering module.

[0030] In this embodiment: Please refer to Figure 2, the voltage detection module includes resistor R5, resistor R6, resistor R7, resistor R8, and capacitor C2. One end of resistor R5 introduces the output voltage of the power supply device. The other end of resistor R5 is connected to one end of resistor R6. The other end of resistor R6 is connected to one end of resistor R7 and one end of resistor R8. The other end of resistor R8 is grounded. The other end of resistor R7 is connected to one end of capacitor C2 and the MCU. The other end of capacitor C2 is grounded.

[0031] After the power supply device, such as solar input power supply or generator input power supply, is converted into a low-voltage through resistor R5, resistor R6, resistor R7, resistor R8, and capacitor C2, it is fed back to the MCU to obtain power supply information in real time.

[0032] In this embodiment: Please refer to Figure 2 , the capacitor filter energy storage module includes fuse F2, capacitor C25, and capacitor C3. One end of fuse F2 introduces the output voltage of the power supply device. The other end of fuse F2 is connected to one end of capacitor C25, one end of capacitor C3, and the buck-boost control module. The other end of capacitor C25 is grounded. The other end of capacitor C3 is grounded.

[0033] Capacitors C25 and C3 play a filtering role to ensure the smoothness of the voltage input to the buck-boost control module.

[0034] Similarly, capacitors C21, C22, and C23 in the capacitor filter module also play a filtering role to ensure the smoothness of the voltage output by the buck-boost control module.

[0035] In this embodiment: Please refer to Figure 2 , the buck-boost control module includes inductor L1 and four conduction control switches. The first end of the first conduction control switch is connected to the capacitor filter energy storage module. The second end of the first conduction control switch is connected to one end of inductor L1 and the first end of the second conduction control switch. The second end of the second conduction control switch is grounded. The other end of inductor L1 is connected to the second end of the third conduction control switch and the first end of the fourth conduction control switch. The first end of the third conduction control switch is connected to the capacitor filter module. The second end of the fourth conduction control switch is grounded;

[0036] The conduction control switch includes MOS transistors Q5 and Q6. The D pole of MOS transistor Q5 is connected to the D pole of MOS transistor Q6, serving as the first end of the conduction control switch. The G pole of MOS transistor Q5 is connected to one end of resistor R32 and one end of resistor R35. The G pole of MOS transistor Q6 is connected to one end of resistor R37 and one end of resistor R40. The other end of resistor R32 is connected to the positive pole of diode D6. The negative pole of diode D6 is connected to the other end of resistor R35, the other end of resistor R40, the negative pole of diode D8, and signal PWM-1-H. The positive pole of diode D8 is connected to the other end of resistor R37. The S pole of MOS transistor Q5 is connected to the S pole of MOS transistor Q6, the other end of resistor R43, and signal PWM-1-L, serving as the second end of the conduction control switch.

[0037] MOS transistors are used as the four conduction control switches for forming the H-bridge. The number of MOS transistors is designed according to the power and current magnitude. The MOS transistors are controlled by PWM, and the output voltage and current feedback can adjust the duty cycle of PWM.

[0038] During boosting, the PWM wave mainly regulates MOS transistors Q11 and Q13; MOS transistors Q5 and Q6 store energy. MOS transistors Q4 and Q7 are cut off at this time and act as diodes. MOS transistors Q10 and Q12 are complementary to Q5 and Q6. When MOS transistors Q11 and Q13 are conducting, the current loop is: input voltage → MOS transistors Q5 and Q6 → inductor L1 → MOS transistors Q11 and Q13 → GND. At this time, inductor L1 is in the charging state. When MOS transistors Q11 and Q13 are turned off, the voltage on inductor L1 reverses. After being superimposed with the input voltage, it first passes through the body diodes of MOS transistors Q4 and Q7, and then passes through the post-stage capacitor filtering module for output. At this time, the current loop is: input voltage → MOS transistors Q5 and Q6 → inductor L1 → body diodes of MOS transistors Q4 and Q7 → capacitor filtering module / load → GND.

[0039] During bucking, the PWM wave mainly regulates MOS transistors Q5 and Q6. MOS transistors Q4 and Q7 act as diodes. MOS transistors Q10 and Q12 are complementary to Q5 and Q6. MOS transistors Q11 and Q13 are in the cut-off state. When MOS transistors Q5 and Q6 are conducting, the current loop is: input voltage → MOS transistors Q5 and Q6 → inductor L1 → body diodes of MOS transistors Q4 and Q7 → capacitor filtering module / load → GND. At this time, the input power supply charges inductor L1 and supplies power to the load. When MOS transistors Q5 and Q6 are turned off, the input is cut off. At this time, inductor L1 supplies power to the load through the body diodes of MOS transistors Q4 and Q7, and inductor L1 is in the discharging state. The current loop is: inductor L1 → body diodes of MOS transistors Q4 and Q7 → load → GND. By feedback regulating the PWM duty cycle of MOS transistors Q5 and Q6, the voltage can be reduced to the designed value.

[0040] In this embodiment: Please refer to Figure 2 The multi-purpose low-cost DC buck-boost converter further includes:

[0041] A current feedback module, which is used to detect the magnitude of the output current of the buck-boost control module and feed it back to the MCU;

[0042] A voltage feedback module, which is used to detect the magnitude of the output voltage of the boost control module and feed it back to the MCU;

[0043] The buck-boost control module is connected to the current feedback module and the voltage feedback module.

[0044] The output voltage of the buck-boost control module is output to the load after passing through the capacitor filtering module. There is a chip U1 in the middle, which serves as a current sensor with the model ACS758, to collect the output current; in the current feedback module, the 3rd pin of the chip U1 feeds the output current back to the MCU through the resistor R27, capacitor C30, and capacitor C69; in the voltage feedback module, after the resistors R16, R24, and R11 are voltage-divided, it is output to the MCU through the resistor R10 and capacitor C33.

[0045] The working principle of the present utility model is: The voltage detection module is used to detect the magnitude of the voltage output by the power supply device. The power supply device includes solar input power supply and generator input power supply; the capacitor filtering and energy storage module is used to filter the voltage output by the power supply device and then output it to the buck-boost control module; the buck-boost control module is used to control the conduction status of the switching tube based on the PWM signal, so that the input voltage is boosted or bucked and then output; the capacitor filtering module is used to filter the output voltage of the buck-boost control module; the current feedback module is used to detect the magnitude of the output current of the buck-boost control module and feed it back to the MCU; the voltage feedback module is used to detect the magnitude of the output voltage of the boost control module and feed it back to the MCU.

[0046] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting.

[0047] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-purpose low-cost DC buck-boost converter, characterized in that: This versatile, low-cost DC buck-boost converter includes: A voltage detection module is used to detect the voltage output by the power supply equipment, including solar input power supply and generator input power supply; The capacitor filtering energy storage module is used to filter the voltage output by the power supply equipment and then output it to the buck-boost control module; The buck-boost control module is used to control the conduction status of the switch tube based on the PWM signal, so that the input voltage is boosted or bucked before output; A capacitor filter module is used to filter the output voltage of the buck-boost control module; The power supply equipment is connected to the voltage detection module and the capacitor filtering energy storage module, the capacitor filtering energy storage module is connected to the buck-boost control module, and the buck-boost control module is connected to the capacitor filtering module.

2. The multi-purpose low-cost DC buck-boost converter according to claim 1, characterized in that: The voltage detection module includes resistor R5, resistor R6, resistor R7, resistor R8, and capacitor C2. One end of resistor R5 introduces the output voltage of the power supply equipment, the other end of resistor R5 is connected to one end of resistor R6, the other end of resistor R6 is connected to one end of resistor R7 and one end of resistor R8, the other end of resistor R8 is grounded, the other end of resistor R7 is connected to one end of capacitor C2 and MCU, and the other end of capacitor C2 is grounded.

3. The multi-purpose low-cost DC buck-boost converter according to claim 1, characterized in that: The capacitor filtering energy storage module includes a fuse F2, a capacitor C25, and a capacitor C3. One end of the fuse F2 introduces the output voltage of the power supply equipment, and the other end of the fuse F2 is connected to one end of the capacitor C25, one end of the capacitor C3, and the buck-boost control module. The other end of the capacitor C25 is grounded, and the other end of the capacitor C3 is grounded.

4. The multi-purpose low-cost DC buck-boost converter according to claim 1, characterized in that: The buck-boost control module includes an inductor L1 and four conduction control switches, wherein a first end of the first conduction control switch is connected to a capacitor filter energy storage module, a second end of the first conduction control switch is connected to one end of the inductor L1 and a first end of a second conduction control switch, a second end of the second conduction control switch is grounded, the other end of the inductor L1 is connected to a second end of a third conduction control switch and a first end of a fourth conduction control switch, a first end of the third conduction control switch is connected to the capacitor filter module, and a second end of the fourth conduction control switch is grounded; The conduction control switch includes a MOS transistor Q5 and a MOS transistor Q6. The D pole of the MOS transistor Q5 is connected to the D pole of the MOS transistor Q6 as a first end of the conduction control switch. The G pole of the MOS transistor Q5 is connected to one end of the resistor R32 and one end of the resistor R35. The G pole of the MOS transistor Q6 is connected to one end of the resistor R37 and one end of the resistor R40. The other end of the resistor R32 is connected to the anode of the diode D6. The cathode of the diode D6 is connected to the other end of the resistor R35, the other end of the resistor R40, the cathode of the diode D8, and the signal PWM-1-H. The anode of the diode D8 is connected to the other end of the resistor R37. The S pole of the MOS transistor Q5 is connected to the S pole of the MOS transistor Q6, the other end of the resistor R43, and the signal PWM-1-L as a second end of the conduction control switch.

5. The multi-purpose low-cost DC buck-boost converter according to any one of claims 1 to 4, characterized in that: The versatile and low-cost DC buck-boost converter also includes: The current feedback module is used to detect the output current of the buck-boost control module and feed it back to the MCU; The voltage feedback module is used to detect the output voltage of the boost control module and feed it back to the MCU; The buck-boost control module is connected to the current feedback module and the voltage feedback module.

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