A high voltage motor control system

Abstract

The utility model provides a kind of high-voltage motor control system, belong to motor control technical field, comprising: power module, control module, current sampling module, drive module and power module;Power module includes the low-voltage power module for the power supply of control module and the high-voltage power module for the power supply of high-voltage motor, drive module and current sampling module are isolator, the input end of drive module is connected control module, and output end is connected high-voltage power module by power module, and power module output end connects high-voltage motor, for output three-phase alternating current to it;Current sampling module samples three-phase alternating current, the utility model places control module at low-voltage end, by the module needed to collect high-voltage signal is set as isolator to realize the isolation of high-voltage part and low-voltage part, to reduce the interference of high-voltage power supply to control signal, by current sampling module, three-phase alternating current is monitored in real time, to avoid high-voltage motor damage or system failure.

Description

TECHNICAL FIELD

[0001] The utility model relates to a high -voltage motor control system belongs to motor control technical field. BACKGROUND

[0002] In recent years, to adapt to the high -power demand of electrical equipment, more and electrical equipment is realized high -power output by increasing voltage, therefore, high -voltage motor is widely used.

[0003] However, the current high -voltage motor control has the following shortcomings:

[0004] (1) MCU is arranged in high -voltage system, and control signal is susceptible to the interference of high -voltage power supply, cannot effectively prevent the risk of electric shock, and operating personnel and electrical equipment have security risks;

[0005] (2) not set up the monitoring measure of motor current to avoid high -voltage motor damage or system failure, or the traditional resistance sampling mode is used to sample current, and good electrical isolation performance cannot be realized. INVENTION CONTENTS

[0006] The utility model discloses a high -voltage motor control system, solve the control signal susceptible to the interference of high -voltage power supply and the problem of not realizing good electrical isolation performance.

[0007] To achieve the above object, the utility model is adopted with the following technical scheme:

[0008] The utility model provides a high -voltage motor control system, include: power module, control module, current sampling module, drive module and power module, the power module includes: low -voltage power module and high -voltage power module, wherein, low -voltage power module is used to power control module, and high -voltage power module is used to power high -voltage motor.

[0009] The drive module is isolating device, and the input end is connected control module, and the output end is connected high -voltage power module through power module.

[0010] The output of power module is connected with high -voltage motor, is used to output three -phase alternating current to high -voltage motor, to drive the operation of high -voltage motor;

[0011] The current sampling module is isolating device, and is connected between control module and high -voltage power module;For sampling the three -phase alternating current of power module output, and the sampling result is transmitted to control module.

[0012] Further, the drive chip in drive module is wide -body isolation drive chip.

[0013] Further, the power module is a silicon carbide power component.

[0014] Further, the current sampling module is a Hall current sensor.

[0015] Further, the voltage sampling module is an isolating device, connected between the control module and the high-voltage power module; the voltage sampling module is used for sampling the real-time voltage of the high-voltage power module and transmitting the sampling result to the control module.

[0016] Further, the voltage sampling module adopts a voltage dividing resistor to divide the high-voltage signal at the end of the high-voltage power module, and transmit a low-voltage signal meeting a preset requirement to the control module.

[0017] Further, the temperature sampling module is used for sampling the temperature of the high-voltage motor and transmitting the sampling result to the control module.

[0018] Further, the temperature sampling module comprises a stator temperature resistor installed inside the high-voltage motor controller and a thermosensitive temperature resistor installed outside the high-voltage motor controller; the stator temperature resistor and the thermosensitive temperature resistor convert the temperature change into a voltage signal and transmit the voltage signal to the control module.

[0019] Further, the low-voltage power module comprises a DCDC unit and an LDO unit; the low-voltage input into the low-voltage power module is first converted into a constant voltage by the DCDC unit, and then is subjected to level conversion by the LDO unit to output a stable voltage required by the control module, so as to realize stable power supply to the control module.

[0020] Further, the communication module connected with the control module is used for realizing signal transmission between the control module and external equipment.

[0021] Compared with the prior art, the high-voltage motor control system has the following beneficial effects:

[0022] (1) The high-voltage motor control system provided by the utility model places the control module at the low-voltage end, sets the module needing to collect high-voltage signals as an isolating device to realize isolation between the high-voltage part and the low-voltage part, so as to reduce the interference of the high-voltage power supply on the control signal, and at the same time, sets the current sampling module to monitor the three-phase alternating current in real time, so as to avoid damage to the high-voltage motor or system failure caused by abnormal conditions such as overloading or short circuit of the circuit.

[0023] (2) The driving module in the high-voltage motor control system is selected from a wide-body isolation driving chip, the creepage distance of the wide-body isolation driving chip is 7-8mm, the high-voltage resistance of the wide-body isolation driving chip is 800-1000V, the wide-body isolation driving chip is suitable for the high-voltage and high-power motor control system, the high-voltage signal is isolated from the low-voltage signal, on the one hand, the interference of the high-voltage signal on the low-voltage signal is reduced, on the other hand, the safe electrical distance is ensured, and the risk of breakdown is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a circuit principle schematic view of the high-voltage motor control system provided in the embodiment 1 of the utility model;

[0025] Figure 2 It is a schematic view of the wide-body isolation driving chip in the embodiment 1 of the utility model. DETAILED DESCRIPTION

[0026] The terms "including" and "having" and any variations thereof in the specification and claims of the utility model and the above-mentioned drawings are intended to cover non-exclusive inclusion, for example, the process, method, system, product or equipment including a series of steps or units do not have to be limited to the clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment. The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Embodiment 1

[0027] The utility model provides a kind of high-voltage motor control system, as shown in Figure 1 It includes: power module, control module MCU, current sampling module, driving module and power module.

[0028] Specifically, power module includes: low-voltage power module and high-voltage power module, wherein, low-voltage power module is used to power control module MCU, high-voltage power module is used to power high-voltage motor.

[0029] In some specific embodiments, low-voltage power module includes: DCDC unit and LDO unit;The low voltage input low-voltage power module is converted into constant voltage by the DCDC unit first, and then realizes level conversion by LDO unit, and outputs the stable voltage required by control module MCU, to realize the stable power supply to control module MCU.

[0030] In more specific embodiments, the low voltage input low-voltage power module is 8~36V.

[0031] The control module MCU is used for monitoring the whole system in real time, and making control decisions based on the processing results of the monitoring data.

[0032] Unlike the traditional control system, the control module MCU is placed in the low-voltage system, and the required high-voltage signal is collected by selecting an isolated device, thereby realizing the isolation of high voltage and low voltage and reducing the interference of high-voltage signal on low-voltage signal.

[0033] The drive module is an isolated device, and its input end is connected to the control module MCU for receiving the control signal from the control module; and its output end is connected to the high-voltage power module through the power module.

[0034] The output end of the power module is connected to the high-voltage motor for outputting three-phase alternating current to the high-voltage motor to drive the operation of the high-voltage motor.

[0035] In some specific embodiments, the drive chip in the drive module is selected from a wide-body isolation drive chip, Figure 2 The traditional narrow-body isolation drive chip (a) and the wide-body isolation drive chip (b) are shown, and as can be seen from the figure, the creepage distance of the wide-body isolation drive chip is 7-8mm, which can withstand a high voltage of 800-1000V, and compared with the narrow-body isolation drive chip, the wide-body isolation drive chip is more suitable for high-voltage motor control system.

[0036] The drive module reduces the interference of high-voltage signal on the other hand, and ensures the safe electrical distance to prevent the risk of breakdown.

[0037] In some specific embodiments, the power module is a silicon carbide SiC power component, and compared with the traditional low-voltage power component IGBT, the breakdown field strength of SiC material is about 10 times that of silicon material, which makes the SiC power component work at a higher voltage, and it has a larger current and voltage bearing capacity, at the same time, the SiC power component has lower switching loss, which can significantly reduce energy waste and heat loss, and improve the efficiency of the whole system. In addition, the high-frequency switching characteristics of the SiC power component make the dynamic response more sensitive, and it can switch at high speed to convert stable direct current into controllable U, V and W three-phase alternating current to drive the high-voltage motor to operate.

[0038] The current sampling module is also an isolated device, which is connected between the control module and the high-voltage power module, and is used for sampling the three-phase alternating current output by the power module and transmitting the sampling results to the control module.

[0039] In some specific embodiments, the current sampling module is a Hall current sensor, which has good electrical isolation performance, and the isolation voltage can reach thousands of volts, and is suitable for high-voltage motor systems, while the traditional resistance sampling method cannot provide such isolation effect. Embodiment 2

[0040] Based on embodiment 1, the embodiment provides a high-voltage motor control system comprising a voltage sampling module and a temperature sampling module.

[0041] Similarly, the voltage sampling module is also an isolated device, which is connected between the control module and the high-voltage power module, and is used for sampling the real-time voltage of the high-voltage power module and transmitting the sampling result to the control module.

[0042] In some specific embodiments, as shown in FIG. 2, the voltage sampling module adopts voltage dividing resistors R3 and R4 to divide the high voltage at the end of the high-voltage power module, and transmit the low voltage signal meeting the preset requirement to the control module MCU. Figure 1

[0043] The temperature sampling module is used for monitoring the temperature of the high-voltage motor, as shown in FIG. 3, the temperature sampling module comprises a stator temperature resistor R2 installed inside the high-voltage motor controller and a thermistor R1 installed outside the high-voltage motor controller; the stator temperature resistor R2 and the thermistor R1 convert the temperature change into a voltage signal and transmit the voltage signal to the control module MCU. Figure 1

[0044] After receiving the voltage signal transmitted by the temperature sampling module, the control module MCU converts the voltage signal into a corresponding temperature value through a preset formula, compares the temperature value with a preset temperature threshold, and judges whether the high-voltage motor is overheated; when the temperature value is higher than the preset temperature threshold, i.e., the high-voltage motor is overheated, the MCU sends an instruction to the driving module to stop the operation of the high-voltage motor.

[0045] In some specific embodiments, the high-voltage motor control system further comprises a communication module connected to the control module, which is used for realizing signal transmission between the control module and external devices. Embodiment 3

[0046] The embodiment provides a high-voltage motor control method, which adopts the high-voltage motor control system of embodiment 1 or embodiment 2.

[0047] ​​The method comprises: sending a control signal to a driving module; then, acquiring three-phase alternating current collected by a current sampling module, and if the three-phase alternating current does not exceed a preset current threshold, correcting the control signal according to the three-phase alternating current to ensure stable operation of the high-voltage motor; but if the three-phase alternating current exceeds the preset current threshold, stopping operation of the high-voltage motor controller through the driving module to avoid damage to the motor caused by abnormal circuit conditions.

[0048] In some embodiments comprising a voltage sampling module and a temperature sampling module, the method further comprises: acquiring real-time voltage collected by the voltage sampling module and a voltage signal generated by the temperature sampling module.

[0049] If the real-time voltage does not exceed a preset voltage threshold, the high-voltage motor controller is maintained in normal operation; but if the real-time voltage exceeds the preset voltage threshold, the operation of the high-voltage motor controller is stopped through the driving module.

[0050] For the voltage signal generated by the temperature sampling module, the temperature value of the high-voltage motor is first calculated through a preset formula, if the temperature value of the high-voltage motor does not exceed a preset temperature threshold, the high-voltage motor controller is maintained in normal operation; but if the temperature value of the high-voltage motor exceeds the preset temperature threshold, the operation of the high-voltage motor controller is stopped through the driving module.

[0051] Such a control mode realizes real-time monitoring and adjustment of the high-voltage motor from three aspects of current, voltage and temperature, not only ensuring that the high-voltage motor provides high-power output safely and stably, but also improving the safety and efficiency of the high-voltage motor control system.

[0052] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features thereof; and such modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A high voltage motor control system, characterized by, include: Power supply module, control module, current sampling module, drive module and power module; The power supply module includes a low-voltage power supply module and a high-voltage power supply module, wherein the low-voltage power supply module is used to supply power to the control module, and the high-voltage power supply module is used to supply power to the high-voltage motor. The drive module is an isolation device, with its input end connected to the control module and its output end connected to the high-voltage power supply module through the power module. The output terminal of the power module is connected to the high-voltage motor and is used to output three-phase AC current to the high-voltage motor to drive its operation. The current sampling module is an isolation device connected between the control module and the high-voltage power supply module; it is used to sample the three-phase AC current output by the power module and transmit the sampling results to the control module.

2. The high voltage electric machine control system of claim 1, wherein, The driver chip in the driver module is a wide-body isolated driver chip.

3. The high voltage electric machine control system of claim 1, wherein, The power module is a silicon carbide power component.

4. The high voltage electric machine control system of claim 1, wherein, The current sampling module is a Hall current sensor.

5. The high voltage electric machine control system of claim 1, wherein, Also includes: A voltage sampling module, which is an isolation device, is connected between the control module and the high-voltage power supply module; it is used to sample the real-time voltage of the high-voltage power supply module and transmit the sampling results to the control module.

6. The high voltage electric machine control system of claim 5, wherein, The voltage sampling module uses voltage divider resistors to divide the high-voltage signal at the high-voltage power supply module and transmits the low-voltage signal that meets the preset requirements to the control module.

7. The high voltage motor control system of claim 1, wherein, Also includes: A temperature sampling module is used to sample the temperature of the high-voltage motor and transmit the sampling results to the control module.

8. The high voltage electric machine control system of claim 7, wherein, The temperature sampling module includes a stator temperature resistor installed inside the high-voltage motor controller and a thermistor temperature resistor installed outside the high-voltage motor controller; the stator temperature resistor and the thermistor temperature resistor convert temperature changes into voltage signals and transmit the voltage signals to the control module.

9. The high voltage electric machine control system of claim 1, wherein, The low-voltage power supply module includes a DC-DC unit and an LDO unit. The low voltage input to the low-voltage power supply module is first converted into a constant voltage by the DC-DC unit, and then the LDO unit performs level conversion to output the stable voltage required by the control module, so as to achieve stable power supply to the control module.

10. The high voltage electric machine control system of claim 9, wherein, Also includes: The communication module, which is connected to the control module, is used to enable signal transmission between the control module and external devices.

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