A power conversion circuit for a high-speed air compressor driver and a high-speed air compressor driver

Abstract

The utility model provides a kind of power conversion circuit and high-speed air compressor driver for high-speed air compressor driver, can realize the independent power supply of high-speed air compressor driver's control circuit, avoid the inconvenience of state monitoring caused by bus power taking, improve system security, comprising: protection unit includes TVS diode, protection unit connects input power supply, and input power supply is low-voltage direct-current power supply;Filter unit includes common mode inductance, and the first side and the second side of common mode inductance are respectively connected with filter capacitor, and protection unit is arranged at the first side of common mode inductance;Power conversion unit is arranged at the second side of common mode inductance, and power conversion unit includes: first isolated power supply, for generating first drive voltage, for the drive circuit of air compressor driver use;Second isolated power supply, for generating second drive voltage, for the signal detection device in the signal detection circuit of air compressor driver use;Third power supply, for generating control voltage, for the control circuit of air compressor driver use.

Description

Technical Field

[0001] This utility model relates to the field of high-speed air compressor technology, specifically to a power conversion circuit for a high-speed air compressor driver and a high-speed air compressor driver. Background Technology

[0002] High-speed air compressors typically refer to equipment with a rotational speed much higher than that of traditional power frequency (50 / 60Hz) driven compressors. Their rotational speed usually ranges from tens of thousands to hundreds of thousands of revolutions per minute, and they are mainly used in scenarios with extremely high requirements for efficiency, reliability, and dynamic response.

[0003] Most small high-speed air compressor drives on the market use bus power to generate control voltage. While this eliminates the need for an external control power supply, it also brings several inconveniences. Because the power is drawn from the bus, the drive's status information can only be obtained when the drive receives bus voltage. When the bus voltage is not connected, important drive information cannot be read, causing significant inconvenience for the use and maintenance of the air compressor. Furthermore, the control circuit requires a dedicated flyback power supply circuit for voltage reduction, and this power circuit, operating at lower bus voltage, is generally non-isolated, which also raises safety concerns.

[0004] In addition, depending on the application, customers need to configure controllers with different voltage specifications, which presents a problem of selection difficulty. Controllers with different voltage specifications come from different suppliers and may have different interfaces and usage characteristics, which makes it difficult to standardize the system design. Utility Model Content

[0005] To address the aforementioned issues, this invention provides a power conversion circuit for a high-speed air compressor driver and a high-speed air compressor driver, enabling independent power supply to the control circuit of the high-speed air compressor driver, avoiding the inconvenience of status monitoring caused by using bus power, and improving system safety.

[0006] The technical solution is as follows: a power conversion circuit for a high-speed air compressor driver, characterized in that it includes: A protection unit, the protection unit including a TVS diode, the protection unit being connected to an input power supply, the input power supply being a low-voltage DC power supply; A filtering unit, comprising a common-mode inductor, wherein a first side and a second side of the common-mode inductor are respectively connected to a filtering capacitor, and a protection unit is disposed on the first side of the common-mode inductor; A power conversion unit, disposed on the second side of the common-mode inductor, comprises: The first isolation power supply is used to generate the first drive voltage for use by the drive circuit of the air compressor driver; The second isolation power supply is used to generate the second drive voltage for use by the signal detection device in the signal detection circuit of the air compressor driver. The third power source is used to generate control voltage for the control circuit of the air compressor driver.

[0007] Furthermore, it also includes a reverse connection protection unit, which includes a MOSFET Q1. The drain of the MOSFET Q1 is connected to the second side of the common mode inductor, the source of the MOSFET Q1 is connected to the power conversion unit, the source of the MOSFET Q1 is connected to ground after being connected to resistors R1 and R2, and the gate of the MOSFET Q1 is connected between resistors R1 and R2.

[0008] Furthermore, the reverse connection protection unit also includes a capacitor C7 connected in parallel with resistors R1 and R2.

[0009] Furthermore, the two input terminals on the first side of the common mode inductor are connected to the positive and negative terminals of the input power supply, respectively. One output terminal on the second side of the common mode inductor is connected to the reverse connection protection unit, and the other output terminal on the second side of the common mode inductor is grounded.

[0010] Furthermore, the filter capacitor of the filter unit includes a capacitor C1 connected between the two input terminals on the first side of the common-mode inductor, and the two input terminals on the first side of the common-mode inductor are respectively connected to capacitors C3 and C4 and then grounded. The filter capacitor also includes a capacitor C2 connected between the two output terminals on the second side of the common-mode inductor, and the two output terminals on the second side of the common-mode inductor are respectively connected to capacitors C5 and C6 and then grounded.

[0011] Furthermore, the first isolated power supply, the second isolated power supply, and the third power supply are all DC / DC power supplies.

[0012] A high-speed air compressor driver, characterized in that it comprises: The power conversion circuit described above is connected to a DC power supply via a low-voltage terminal. The power conversion circuit is connected to the control circuit, drive circuit, and signal detection circuit of the air compressor, and supplies power to the control circuit, drive circuit, and signal detection circuit. The control circuit is connected to the control terminal via a communication interface through a low-voltage terminal. It also includes a power conversion circuit, which is connected to a DC bus via a high-voltage terminal and powered by the DC bus. A drive circuit is connected to the power conversion circuit to provide drive. The power conversion circuit is connected to the high-speed air compressor via an output terminal.

[0013] The power conversion circuit for a high-speed air compressor driver of this utility model uses an independent low-voltage DC power supply to power the control, drive and signal detection circuits of the high-speed air compressor driver. It can solve the drawback of existing solutions that rely on high-voltage buses. When the driver is not connected to the high-voltage DC bus or when the bus voltage is faulty, the low-voltage control side circuit can still work normally. Users can obtain important data such as the driver's operating status and fault information in real time through the low-voltage terminals, which greatly facilitates the debugging, use and maintenance of the product. The power conversion circuit for a high-speed air compressor driver of this utility model provides isolated power to the drive circuit and signal detection circuit of the driver, respectively, with a first isolation power supply and a second isolation power supply. An electrical isolation barrier is built between the low-voltage control side and the high-voltage power side, which can effectively avoid the impact of high voltage on low-voltage sensitive circuits and solve the safety hazards caused by existing non-isolation schemes. This utility model's high-speed air compressor driver separates the control power supply from the high-voltage DC bus power supply through a power conversion circuit and adopts an isolation architecture. The DC bus voltage can be uniformly implemented within a certain range, which can well form compatibility with systems of different voltage levels, improve product safety, solve the problem that customers must select different models of controllers due to different voltage level requirements, facilitate customers to carry out unified design and standardized deployment, and reduce the complexity of system design. Attached Figure Description

[0014] Figure 1 This is a block diagram of the power conversion circuit for a high-speed air compressor driver in the embodiment. Figure 2 This is a circuit diagram of the power conversion circuit for the high-speed air compressor driver in the embodiment. Figure 3 This is a block diagram of the components of a high-speed air compressor driver in an embodiment. Detailed Implementation

[0015] See Figure 1 , Figure 2 This utility model discloses a power conversion circuit for a high-speed air compressor driver, comprising: Protection unit 100, the protection unit includes TVS diode Z1, the protection unit 100 is connected to the input power supply, the input power supply is a low voltage DC power supply; The filter unit 200 includes a common-mode inductor CM1. Filtering capacitors are connected to the first and second sides of the common-mode inductor CM1, and the protection unit 100 is disposed on the first side of the common-mode inductor CM1. Power conversion unit 300, the power conversion unit is disposed on the second side of the common mode inductor, the power conversion unit includes: The first isolation power supply U1 is used to generate the first drive voltage for use by the drive circuit of the air compressor driver; The second isolation power supply U2 is used to generate the second drive voltage for use by the signal detection device in the signal detection circuit of the air compressor driver. The third power supply U3 is used to generate control voltage for the control circuit of the air compressor driver.

[0016] In this embodiment, the first isolation power supply U1, the second isolation power supply U2, and the third power supply U3 are DC / DC power supplies, respectively.

[0017] In one embodiment, a reverse connection protection unit 400 is further included. The reverse connection protection unit 400 includes a MOSFET Q1, the drain of which is connected to the second side of a common-mode inductor, the source of which is connected to a power conversion unit, the source of which is connected to resistors R1 and R2 and then grounded, and the gate of which is connected between resistors R1 and R2. The reverse connection protection unit 400 also includes a capacitor C7 connected in parallel with resistors R1 and R2. The two input terminals of the first side of the common-mode inductor CM1 are respectively connected to the positive and negative terminals of the input power supply. One output terminal of the second side of the common-mode inductor CM1 is connected to the reverse connection protection unit 400, and the other output terminal of the second side of the common-mode inductor CM1 is grounded.

[0018] In this embodiment, the filter capacitor of the filter unit includes a capacitor C1 connected between the two input terminals on the first side of the common-mode inductor, and the two input terminals on the first side of the common-mode inductor are respectively connected to capacitors C3 and C4 and then grounded. The filter capacitor also includes a capacitor C2 connected between the two output terminals on the second side of the common-mode inductor, and the two output terminals on the second side of the common-mode inductor are respectively connected to capacitors C5 and C6 and then grounded.

[0019] Using the power conversion circuit in the embodiment, after the low-voltage DC power supply is input, it first passes through the protection unit 100. The protection unit 100 includes a TVS diode Z1. When a surge or overvoltage occurs at the input terminal, the TVS diode will quickly clamp the voltage to protect the subsequent circuit from damage.

[0020] Subsequently, the power supply enters the filtering unit, which consists of a common-mode inductor CM1 and filter capacitors C1 to C6. Capacitors C1 and C2 are differential-mode capacitors used to filter out differential-mode interference; capacitors C3, C4, C5, and C6 are common-mode capacitors, which work together with the common-mode inductor CM1 to effectively suppress common-mode interference. The setting of the filtering unit ensures the purity of the power supply and meets the electromagnetic compatibility (EMC) requirements.

[0021] To prevent circuit damage due to reverse power supply polarity, a reverse connection protection unit 400 is provided in this embodiment. The reverse connection protection unit 400 consists of a P-channel MOSFET switch Q1, voltage divider resistors R1 and R2, and a filter capacitor C7. When the positive power supply is connected, the input positive voltage is divided by resistors R1 and R2, making the gate voltage of MOSFET Q1 much lower than its source voltage. Therefore, MOSFET Q1 is turned on, and the power supply can flow normally to the subsequent circuit. When the negative power supply is connected, the gate voltage of MOSFET Q1 will be equal to or higher than its source voltage. MOSFET Q1 remains in the off state, thereby cutting off the current path and protecting the entire subsequent circuit. In this embodiment, capacitor C7 is used to stabilize the gate voltage of MOSFET Q1 and prevent false triggering caused by voltage fluctuations.

[0022] In this embodiment, the power conversion circuit integrates a protection unit, a filtering unit, and a reverse connection protection unit. The units work together to effectively suppress transient overvoltage and electromagnetic interference of the input power supply, and prevent circuit damage caused by reverse polarity connection of the power supply, thereby comprehensively improving the stability and reliability of the driver in complex industrial environments.

[0023] After filtering and reverse connection protection, the DC power enters the power conversion unit 300. The power conversion unit 300 is designed with three independent outputs to meet the needs of different circuit modules within the high-speed air compressor driver, including: The first isolation power supply U1 is an isolated DC / DC converter that converts the input low-voltage DC power into the first drive voltage V1 to supply the drive circuit of the driver. Since the drive circuit is directly connected to the power switch on the high-voltage side, the first isolation power supply U1 is an isolated power supply to achieve electrical isolation between the high-voltage side and the low-voltage control side, ensure safety and avoid ground loop interference. The second isolated power supply U2 is also an isolated DC / DC converter, which converts the input low-voltage DC power into the second drive voltage V2 to supply the front-end devices in the signal detection circuit of the driver, such as the Hall current sensor or the primary side of the isolated operational amplifier. The measuring end of the sensor device in the signal detection circuit is usually located on the high-voltage side, so the second isolated power supply U2 that supplies it also uses an isolated power supply so that the detected signal can be safely transmitted back to the control circuit on the low-voltage side for processing. The third power supply U3 can be a non-isolated DC / DC converter that uses a Buck circuit to convert the input low-voltage DC power into a control voltage V3 to supply the driver's control circuit. The entire control circuit operates on the low-voltage side, so the third power supply U3 does not require isolation design, simplifying the circuit and reducing costs.

[0024] The power conversion circuit in this embodiment provides a separate power supply for the control circuit. It can read the status information of the driver without being connected to the bus, which improves the availability and maintenance convenience of the product. The power conversion circuit in this embodiment adopts a high-low voltage isolation architecture design, which safely separates the low-voltage control side from the high-voltage power side, improves the safety performance of the product, and can better support compatibility with systems of different voltage levels.

[0025] The power conversion circuit in this embodiment avoids using a complex and typically inefficient high-to-low voltage flyback power supply circuit. Instead, it uses a mature and reliable modular DC / DC power supply, which simplifies the design of the power supply section and helps improve the stability and reliability of the entire power system.

[0026] See Figure 3 In an embodiment of this utility model, a high-speed air compressor driver is also provided, comprising: The power conversion circuit 1 described above is connected to a low-voltage DC power supply 3 via a low-voltage terminal 2. The power conversion circuit 1 is connected to the control circuit 4, drive circuit 5, and signal detection circuit 6 of the air compressor, and supplies power to the control circuit 4, drive circuit 5, and signal detection circuit 6. The control circuit 4 is connected to the control terminal via a communication interface through the low-voltage terminal 2. It also includes a power conversion circuit 7, which is connected to a DC bus 9 via a high-voltage terminal 8 and powered by the DC bus 9. A drive circuit 5 is connected to the power conversion circuit 7 to provide drive. The power conversion circuit 7 is connected to a high-speed air compressor 11 via an output terminal 10.

[0027] The innovation of the high-speed air compressor driver in this embodiment mainly focuses on the hardware architecture of the power conversion circuit, including its protection, filtering, reverse connection protection, and the combination of multiple power conversion units. It does not involve the driving or control methods of the high-speed air compressor. In this embodiment, the low-voltage terminal expansion interface is used for low-voltage DC power input. When the DC power supply is input to the driver, it passes through the power conversion circuit and is used by the control circuit. The control circuit is independently connected to the controlled circuit, and the driver's status information can be read normally under any circumstances, facilitating product use and maintenance. The DC power supply and the power conversion circuit use a unified isolation architecture, allowing the DC bus voltage to be uniformly input within a certain range, ensuring good compatibility with different voltage level systems and improving product safety.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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 power conversion circuit for a high-speed air compressor driver, characterized in that, include: A protection unit, the protection unit including a TVS diode, the protection unit being connected to an input power supply, the input power supply being a low-voltage DC power supply; A filtering unit, comprising a common-mode inductor, wherein a first side and a second side of the common-mode inductor are respectively connected to a filtering capacitor, and a protection unit is disposed on the first side of the common-mode inductor; A power conversion unit, disposed on the second side of the common-mode inductor, comprises: The first isolation power supply is used to generate the first drive voltage for use by the drive circuit of the air compressor driver; The second isolation power supply is used to generate the second drive voltage for use by the signal detection device in the signal detection circuit of the air compressor driver. The third power source is used to generate the control voltage for the control circuit of the air compressor driver.

2. The power conversion circuit for a high-speed air compressor driver according to claim 1, characterized in that: It also includes a reverse connection protection unit, which includes a MOSFET Q1. The drain of the MOSFET Q1 is connected to the second side of the common mode inductor, the source of the MOSFET Q1 is connected to the power conversion unit, the source of the MOSFET Q1 is connected to resistors R1 and R2 and then grounded, and the gate of the MOSFET Q1 is connected between resistors R1 and R2.

3. A power conversion circuit for a high-speed air compressor driver according to claim 2, characterized in that: The reverse connection protection unit also includes a capacitor C7 connected in parallel with resistors R1 and R2.

4. A power conversion circuit for a high-speed air compressor driver according to claim 2, characterized in that: The two input terminals on the first side of the common-mode inductor are connected to the positive and negative terminals of the input power supply, respectively. One output terminal on the second side of the common-mode inductor is connected to the reverse connection protection unit, and the other output terminal on the second side of the common-mode inductor is grounded.

5. A power conversion circuit for a high-speed air compressor driver according to claim 4, characterized in that: The filtering unit includes a capacitor C1 connected between the two input terminals on the first side of the common-mode inductor, and the two input terminals on the first side of the common-mode inductor are connected to capacitors C3 and C4 respectively and then grounded. The filtering capacitor also includes a capacitor C2 connected between the two output terminals on the second side of the common-mode inductor, and the two output terminals on the second side of the common-mode inductor are connected to capacitors C5 and C6 respectively and then grounded.

6. A power conversion circuit for a high-speed air compressor driver according to claim 1, characterized in that: The first isolated power supply, the second isolated power supply, and the third power supply are all DC / DC power supplies.

7. A high-speed air compressor driver, characterized in that: The power conversion circuit includes any one of claims 1 to 6, wherein the power conversion circuit is connected to a low-voltage DC power supply through a low-voltage terminal, the power conversion circuit is connected to the control circuit, drive circuit and signal detection circuit of the air compressor, and supplies power to the control circuit, drive circuit and signal detection circuit, and the control circuit is connected to the control terminal through a communication interface via a low-voltage terminal; It also includes a power conversion circuit, which is connected to a DC bus via a high-voltage terminal and powered by the DC bus. A drive circuit is connected to the power conversion circuit to provide drive. The power conversion circuit is connected to the high-speed air compressor via an output terminal.

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