Direct current motor driving module with high heat dissipation function

Abstract

The invention relates to the technical field of IPM modules, in particular to a direct current motor driving module with a high heat dissipation function, which comprises a power switch device, a driving circuit sub-module, a fault detection sub-module, an intelligent control algorithm sub-module and a heat dissipation structure, and is characterized in that the power switch device is used for switching on and off high voltage and large current; the driving circuit sub-module is used for accurately controlling on and off of the power switch device; the fault detection sub-module is used for setting a plurality of protection circuits to protect the IPM half-bridge structure; the intelligent control algorithm sub-module is used for designing an intelligent control algorithm and automatically adjusting the working state of a motor or increasing the rotating speed of a cooling fan when the temperature exceeds a preset threshold value; therefore, the IPM half-bridge structure not only integrates a power switch device and a driving circuit, but also integrates an efficient heat dissipation structure inside, thereby remarkably improving the heat dissipation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of IPM modules, and in particular to a DC motor drive module with high heat dissipation function. Background Art

[0002] When a hair dryer is in use, the IPM module mainly controls the conduction and cut-off of power devices through its internal drive circuit, so as to control the motor current; enabling the hair dryer to adjust the motor speed and power according to different needs, and then realizing different wind speeds and heat outputs. However, the IPM half-bridge structure of the DC motor drive module set inside the hair dryer will emit a large amount of heat during operation, so heat dissipation is required; currently, natural heat dissipation or heat sinks are used to achieve the heat dissipation effect.

[0003] In the aforementioned prior art, traditional heat dissipation methods have limited heat dissipation effects when facing DC motors with high power density and long-term operation, which easily lead to motor overheating and affect service life and performance. Summary of the Invention

[0004] The purpose of the present invention is to provide a DC motor drive module with high heat dissipation function, which solves the problems that in the prior art, traditional heat dissipation methods have limited heat dissipation effects when facing DC motors with high power density and long-term operation, which easily lead to motor overheating and affect service life and performance.

[0005] To achieve the above purpose, the present invention provides a DC motor drive module with high heat dissipation function, including a power switch device, a drive circuit sub-module, a fault detection sub-module, an intelligent control algorithm sub-module, and a heat dissipation structure. The power switch device, the drive circuit sub-module, the fault detection sub-module, the intelligent control algorithm sub-module, and the heat dissipation structure are connected in sequence;

[0006] The power switch device is used to switch high voltage and large current;

[0007] The drive circuit sub-module is used to accurately control the turn-on and turn-off of the power switch device;

[0008] The fault detection sub-module is used to set multiple protection circuits to protect the IPM half-bridge structure;

[0009] The intelligent control algorithm sub-module is used to design an intelligent control algorithm to automatically adjust the working state of the motor or increase the rotation speed of the cooling fan when the temperature exceeds a preset threshold;

[0010] The heat dissipation structure is used to use heat sinks made of high thermal conductivity materials and an optimized heat dissipation channel design to improve the heat dissipation effect.

[0011] Among them, the driving circuit sub-module includes a signal isolation circuit unit, an amplification circuit unit, and a signal shaping unit, and the signal isolation circuit unit, the amplification circuit unit, and the signal shaping unit are connected in sequence;

[0012] The signal isolation circuit unit is used to isolate the control signal to prevent interference and noise from affecting the control signal;

[0013] The amplification circuit unit is used to amplify the control signal to drive the gate of the power switch device;

[0014] The signal shaping unit is used to shape the control signal of the controller.

[0015] Among them, the intelligent control algorithm sub-module includes a temperature monitoring unit, a threshold setting unit, a normal operation unit, and a control mode switching unit, and the temperature monitoring unit, the threshold setting unit, the normal operation unit, and the control mode switching unit are connected in sequence;

[0016] The temperature monitoring unit is used to set a temperature sensor to monitor the operating temperature of the IPM module;

[0017] The threshold setting unit is used to set the first-level threshold, second-level threshold, and third-level threshold of the temperature for temperature control;

[0018] The normal operation unit is used to make the motor operate normally according to the default settings and keep the fan running at 25% speed when the temperature does not exceed the threshold;

[0019] The control mode switching unit is used to switch the temperature control mode after suppressing the temperature below a certain threshold when using the threshold setting unit.

[0020] Among them, the threshold setting unit includes a first-level control sub-unit, a second-level control sub-unit, and a third-level control sub-unit, and the first-level control sub-unit, the second-level control sub-unit, and the third-level control sub-unit are connected in sequence;

[0021] The first-level control sub-unit is used to increase the fan speed to 40% when the temperature exceeds the first-level threshold;

[0022] The second-level control sub-unit is used to increase the fan speed to 75% and reduce the motor output power to 90% when the temperature exceeds the second-level threshold;

[0023] The third-level control sub-unit is used to increase the fan speed to 100% and reduce the motor output power to 80% when the temperature exceeds the third-level threshold.

[0024] Among them, the control mode switching unit includes a first-level switching subunit, a second-level switching subunit, and a third-level switching subunit, and the first-level switching subunit, the second-level switching subunit, and the third-level switching subunit are connected in sequence;

[0025] The first-level switching subunit is used to automatically switch to the normal operation unit after the temperature is controlled to be lower than the first-level threshold and maintained for 1 minute;

[0026] The second-level switching subunit is used to automatically switch to the first-level control unit after the temperature is controlled to be lower than the second-level threshold and maintained for 1 minute;

[0027] The third-level switching subunit is used to automatically switch to the second-level control unit after the temperature is controlled to be lower than the third-level threshold and maintained for 1 minute.

[0028] Among them, the fault detection sub-module includes an overheat detection unit, an overcurrent detection unit, and an overvoltage detection unit, and the overheat detection unit, the overcurrent detection unit, and the overvoltage detection unit are connected in sequence;

[0029] The overheat detection unit is used to monitor the internal temperature of the IPM module by relying on the temperature sensor. When the temperature exceeds the overheat disconnection threshold, the internal control circuit of the IPM will cut off the gate drive signal, not accept the input control signal, and at the same time output an overheat fault signal. When the temperature drops to the overheat reset threshold, the circuit automatically resumes normal operation;

[0030] The overcurrent detection unit is used to set the IGBT current sensor to detect the current. When the current exceeds the set safety threshold, the IPM module adopts a soft turn-off technology to gradually reduce the IGBT gate voltage, so that the conduction current of the IGBT gradually decreases, reducing the voltage impact during turn-off, and at the same time outputting an overcurrent fault signal;

[0031] The overvoltage detection unit is used to set an overvoltage sensor and an overvoltage protector. The overvoltage sensor detects the voltage. After the voltage exceeds the set safety threshold, the overvoltage protector is started to quickly cut off the circuit, and at the same time output an overvoltage fault signal.

[0032] Among them, the heat dissipation structure includes a heat dissipation plate, a plurality of S-shaped heat dissipation fins, and a plurality of heat dissipation columns. The plurality of S-shaped heat dissipation fins are all fixedly connected to the heat dissipation plate and are sequentially distributed on one side of the heat dissipation plate. There is a heat dissipation channel between two adjacent S-shaped heat dissipation fins. The plurality of heat dissipation columns are all fixedly connected to the heat dissipation plate and are sequentially distributed inside the heat dissipation channel. The S-shaped heat dissipation fin has a plurality of grooves.

[0033] A DC motor drive module with high heat dissipation function of the present invention, the power switch device is used to switch high voltage and large current; the drive circuit sub-module is used to accurately control the turn-on and turn-off of the power switch device; the fault detection sub-module is used to set a variety of protection circuits to protect the IPM half-bridge structure; the intelligent control algorithm sub-module is used to design an intelligent control algorithm to automatically adjust the working state of the motor or increase the speed of the cooling fan when the temperature exceeds a preset threshold; the heat dissipation structure is used to adopt heat sinks made of high thermal conductivity materials and an optimized heat dissipation channel design to improve the heat dissipation effect;

[0034] Thus, the IPM half-bridge structure not only integrates the power switch device and the drive circuit, but also has a built-in fault detection function. By monitoring the temperature threshold and automatically operating the motor and the fan according to different thresholds, the best heat dissipation effect can be achieved. At the same time, an efficient heat dissipation structure is integrated inside to ensure that heat can be dissipated in a timely and effective manner, thereby significantly improving the heat dissipation effect, avoiding motor overheating, and increasing the service life and performance of the motor. Brief Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0036] Figure 1 It is the schematic diagram of the DC motor drive module with high heat dissipation function of the present invention.

[0037] Figure 2 It is the schematic diagram of the drive circuit sub-module of the present invention.

[0038] Figure 3 It is the schematic diagram of the fault detection sub-module of the present invention.

[0039] Figure 4 It is the schematic diagram of the intelligent control algorithm sub-module of the present invention.

[0040] Figure 5 It is the schematic diagram of the threshold setting unit of the present invention.

[0041] Figure 6 It is the schematic diagram of the control mode switching unit of the present invention.

[0042] Figure 7 It is the structural schematic diagram of the heat dissipation structure of the present invention.

[0043] Figure 8 It is the side view of the heat dissipation structure of the present invention.

[0044] 1 - Power switch device, 2 - Drive circuit sub - module, 201 - Signal isolation circuit unit, 202 - Amplification circuit unit, 203 - Signal shaping unit, 3 - Fault detection sub - module, 301 - Overheat detection unit, 302 - Over - current detection unit, 303 - Over - voltage detection unit, 4 - Intelligent control algorithm sub - module, 401 - Temperature monitoring unit, 402 - Threshold setting unit, 4021 - Primary control sub - unit, 4022 - Secondary control sub - unit, 4023 - Tertiary control sub - unit, 403 - Normal operation unit, 404 - Control mode switching unit, 4041 - Primary switching sub - unit, 4042 - Secondary switching sub - unit, 4043 - Tertiary switching sub - unit, 5 - Heat dissipation structure, 501 - Heat dissipation plate, 502 - S - shaped heat sink, 503 - Heat dissipation column, 504 - Heat dissipation channel, 505 - Groove. Detailed implementation mode

[0045] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0046] Please refer to Figures 1 to 8 , the present invention provides a DC motor drive module with high heat dissipation function, specifically including:

[0047] The power switch device 1 is used to switch high voltage and large current;

[0048] It is responsible for converting the high voltage and large current of the input power supply into the appropriate voltage and current required by the load, so as to achieve effective conversion and control of power; Therefore, by controlling the on - off of the power switch device 1, the IPM half - bridge structure can convert direct current into alternating current, or adjust the amplitude and frequency of the output voltage.

[0049] The drive circuit sub - module 2 is used to precisely control the on - off of the power switch device 1;

[0050] Specifically including:

[0051] The signal isolation circuit unit 201 is used to isolate control signals and prevent interference and noise from affecting control signals;

[0052] There are various interference sources in the electrical system, such as grid spike pulses, electromagnetic radiation, etc. These interferences may seriously affect the normal operation of the circuit. The signal isolation circuit can cut off the channel of interference coupling, thereby effectively suppressing the influence of these interferences on the circuit. This helps to improve the anti - interference ability of the circuit and ensure the stability and reliability of the system.

[0053] The amplifier circuit unit 202 is used to amplify the control signal to drive the gate of the power switch device 1.

[0054] The signal isolation circuit first receives the weak control signal from the controller. These signals usually have low voltage and current levels and cannot directly drive the gate of the power switch device 1 (such as IGBT or MOSFET). Therefore, the amplification part in the signal isolation circuit is responsible for amplifying these weak control signals to a sufficient level to ensure that the power switch device 1 can be reliably driven.

[0055] The signal shaping unit 203 is used to shape the control signal of the controller.

[0056] During the signal transmission process, due to the influence of various factors (such as noise, interference, attenuation, etc.), the signal quality may deteriorate, which may cause changes in parameters such as the amplitude, frequency, and phase of the signal, or even distortion. Therefore, the signal isolation circuit shapes the control signal, eliminates the noise and interference in the signal, and restores parameters such as the amplitude, frequency, and phase of the signal to make the signal clearer and more accurate, so as to ensure that its waveform and timing meet the requirements of the gate drive of the power switch device 1.

[0057] The fault detection sub-module 3 is used to set up a variety of protection circuits to protect the IPM half-bridge structure.

[0058] Specifically, it includes:

[0059] The overheat detection unit 301 is used to monitor the internal temperature of the IPM module by relying on the temperature sensor. When the temperature exceeds the overheat disconnection threshold, the internal control circuit of the IPM will cut off the gate drive signal, not accept the input control signal, and at the same time output an overheat fault signal. When the temperature drops to the overheat reset threshold, the circuit automatically resumes normal operation.

[0060] The overcurrent detection unit 302 is used to set an IGBT current sensor to detect the current. When the current exceeds the set safety threshold, the IPM module adopts a soft turn-off technology to gradually reduce the IGBT gate voltage, so that the conduction current of the IGBT gradually decreases, reducing the voltage impact during turn-off, and at the same time outputting an overcurrent fault signal.

[0061] The overvoltage detection unit 303 is used to set an overvoltage sensor and an overvoltage protector. The overvoltage sensor detects the voltage. After the voltage exceeds the set safety threshold, the overvoltage protector is started to quickly cut off the circuit, and at the same time output an overvoltage fault signal.

[0062] The intelligent control algorithm sub-module 4 is used to design an intelligent control algorithm to automatically adjust the working state of the motor or increase the rotation speed of the cooling fan when the temperature exceeds the preset threshold.

[0063] Specifically, it includes:

[0064] The temperature monitoring unit 401 is used to set a temperature sensor to monitor the operating temperature of the IPM module;

[0065] The operating state of the IPM module can be monitored in real time through the temperature sensor, so as to facilitate subsequent corresponding fan settings.

[0066] The threshold setting unit 402 is used to set the first-level threshold, second-level threshold and third-level threshold of the temperature for temperature control;

[0067] Specifically, it includes:

[0068] The first-level control subunit 4021 is used to increase the fan speed to 40% when the temperature exceeds the first-level threshold;

[0069] When the temperature exceeds the first-level threshold, it means that the temperature has increased slightly compared with normal. At this time, only increasing the fan speed is needed. If the temperature cannot be suppressed, additional adjustments will be made later.

[0070] The second-level control subunit 4022 is used to increase the fan speed to 75% and reduce the motor output power to 90% when the temperature exceeds the second-level threshold;

[0071] When the temperature exceeds the second-level threshold, it means that the foregoing strategy has failed and the temperature has increased significantly. At this time, the fan speed should be further increased while controlling the motor power to ensure that the temperature of the motor can be controlled within a safe temperature.

[0072] The third-level control subunit 4023 is used to increase the fan speed to 100% and reduce the motor output power to 80% when the temperature exceeds the third-level threshold;

[0073] When the temperature exceeds the third-level threshold, it means that the temperature has reached an extremely high state, and accidents or motor damage are likely to occur. At the same time, the foregoing temperature strategy is ineffective. At this time, the fan speed is fully opened, and the motor power is reduced again to effectively control the temperature.

[0074] The normal operation unit 403 is used to make the motor operate normally according to the default settings and keep the fan running at a speed of 25% when the temperature does not exceed the threshold;

[0075] The control mode switching unit 404 is used to switch the temperature control mode after suppressing the temperature below a certain threshold when using the threshold setting unit 402.

[0076] Specifically, it includes:

[0077] The first-level switching subunit 4041 is configured to automatically switch to the normal operation unit 403 after the temperature is controlled to be lower than the first-level threshold and remains for 1 minute.

[0078] The second-level switching subunit 4042 is configured to automatically switch to the first-level control unit after the temperature is controlled to be lower than the second-level threshold and remains for 1 minute.

[0079] The third-level switching subunit 4043 is configured to automatically switch to the second-level control unit after the temperature is controlled to be lower than the third-level threshold and remains for 1 minute.

[0080] When the temperature drops to the threshold of the next level and remains for one minute, it indicates that the temperature has been controlled. At this time, the fan speed can be reduced while the motor power is increased to ensure the operation quality of the motor; if the temperature exceeds the threshold again, the intelligent control algorithm sub-module 4 is restarted, and this cycle continues.

[0081] The heat dissipation structure 5 is made of heat dissipation fins made of high thermal conductivity materials and an optimized heat dissipation channel 504 design to improve the heat dissipation effect.

[0082] Specifically, it includes:

[0083] The heat dissipation structure 5 includes a heat dissipation plate 501, a plurality of S-shaped heat dissipation fins 502, and a plurality of heat dissipation columns 503. The plurality of S-shaped heat dissipation fins 502 are fixedly connected to the heat dissipation plate 501 and are sequentially distributed on one side of the heat dissipation plate 501. There is a heat dissipation channel 504 between two adjacent S-shaped heat dissipation fins 502. The plurality of heat dissipation columns 503 are fixedly connected to the heat dissipation plate 501 and are sequentially distributed inside the heat dissipation channel 504. The S-shaped heat dissipation fin 502 has a plurality of grooves 505.

[0084] Among them, by installing the heat dissipation plate 501 on the IPM half-bridge structure, and at the same time the heat dissipation plate 501 supports the S-shaped heat dissipation fins 502 and the heat dissipation columns 503. When the fan blows, air flows through the heat dissipation channel 504 inside the brackets of the two S-shaped heat dissipation fins 502. Relying on the heat dissipation columns 503 arranged inside the heat dissipation channel 504 and in cooperation with the arc of the S-shaped heat dissipation fins 502, the contact area with air can be increased, the heat dissipation effect can be improved, and then the temperature of the IPM half-bridge structure can be reduced by relying on the heat dissipation plate 501. At the same time, the arranged grooves 505 can further increase the contact area between the S-shaped heat dissipation fins 502 and air, improving the heat dissipation effect.

[0085] The above-disclosed is only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A DC motor drive module with high heat dissipation function, characterized in that: It includes a power switch device, a drive circuit submodule, a fault detection submodule, an intelligent control algorithm submodule and a heat dissipation structure, wherein the power switch device, the drive circuit submodule, the fault detection submodule, the intelligent control algorithm submodule and the heat dissipation structure are connected in sequence; The power switch device is used to switch high voltage and high current; The driving circuit submodule is used to accurately control the on and off of the power switch device; The fault detection submodule is used to set a variety of protection circuits to protect the IPM half-bridge structure; The intelligent control algorithm submodule is used to design an intelligent control algorithm to automatically adjust the working state of the motor or increase the speed of the cooling fan when the temperature exceeds a preset threshold; The heat dissipation structure is used to adopt a heat sink made of a high thermal conductivity material and an optimized heat dissipation channel design to improve the heat dissipation effect.

2. The DC motor drive module with high heat dissipation function as claimed in claim 1, characterized in that: The driving circuit submodule comprises a signal isolation circuit unit, an amplifying circuit unit and a signal shaping unit, wherein the signal isolation circuit unit, the amplifying circuit unit and the signal shaping unit are connected in sequence; The signal isolation circuit unit is used to isolate the control signal to prevent interference and noise from affecting the control signal; The amplifying circuit unit is used to amplify the control signal to drive the gate of the power switching device; The signal shaping unit is used to shape the control signal of the controller.

3. The DC motor driving module with high heat dissipation function as claimed in claim 2, characterized in that: The intelligent control algorithm submodule includes a temperature monitoring unit, a threshold setting unit, a normal operation unit and a control mode switching unit, and the temperature monitoring unit, the threshold setting unit, the normal operation unit and the control mode switching unit are connected in sequence; The temperature monitoring unit is used to set a temperature sensor to monitor the operating temperature of the IPM module; The threshold setting unit is used to set the primary threshold, secondary threshold and tertiary threshold of the temperature to perform temperature control; The normal operation unit is used for the motor to operate normally according to the default setting when the temperature does not exceed the threshold value, and the fan maintains a rotation speed of 25%; The control mode switching unit is used to switch the temperature control mode after the temperature is suppressed below a certain threshold when the threshold setting unit is used.

4. The DC motor driving module with high heat dissipation function as claimed in claim 3, characterized in that: The threshold setting unit includes a primary control subunit, a secondary control subunit, and a tertiary control subunit, and the primary control subunit, the secondary control subunit, and the tertiary control subunit are connected in sequence; The first-level control subunit is used to increase the fan speed to 40% when the temperature exceeds the first-level threshold; The secondary control subunit is used to increase the fan speed to 75% and reduce the motor output power to 90% when the temperature exceeds the secondary threshold; The three-level control subunit is used to increase the fan speed to 100% and reduce the motor output power to 80% when the temperature exceeds the three-level threshold.

5. The DC motor driving module with high heat dissipation function as claimed in claim 4, characterized in that: The control mode switching unit comprises a primary switching subunit, a secondary switching subunit and a tertiary switching subunit, wherein the primary switching subunit, the secondary switching subunit and the tertiary switching subunit are connected in sequence; The first-level switching subunit is used to automatically switch to the normal operation unit after the temperature is controlled to be lower than the first-level threshold and maintained for 1 minute; The secondary switching subunit is used to automatically switch to the primary control unit after the temperature is controlled to be lower than the secondary threshold and maintained for 1 minute; The three-level switching subunit is used to automatically switch to the second-level control unit after the temperature is controlled to be lower than the third-level threshold and maintained for 1 minute.

6. The DC motor driving module with high heat dissipation function as claimed in claim 5, characterized in that: The fault detection submodule comprises an overheat detection unit, an overcurrent detection unit and an overvoltage detection unit, wherein the overheat detection unit, the overcurrent detection unit and the overvoltage detection unit are connected in sequence; The overheat detection unit is used to monitor the internal temperature of the IPM module by relying on the temperature sensor. When the temperature exceeds the overheat disconnection threshold, the internal control circuit of the IPM will cut off the gate drive signal, not accept the input control signal, and output an overheat fault signal. When the temperature drops to the overheat reset threshold, the circuit automatically resumes normal operation; The overcurrent detection unit is used to set the IGBT current sensor to detect the current. When the current exceeds the set safety threshold, the IPM module uses soft shutdown technology to gradually reduce the IGBT gate voltage, so that the IGBT conduction current gradually decreases, reducing the voltage impact during shutdown, and outputs an overcurrent fault signal at the same time; The overvoltage detection unit is used to set an overvoltage sensor and an overvoltage protector. The overvoltage sensor detects the voltage. When the voltage exceeds a set safety threshold, the overvoltage protector is activated to quickly cut off the circuit and output an overvoltage fault signal.

7. The DC motor driving module with high heat dissipation function as claimed in claim 6, characterized in that: The heat dissipation structure includes a heat dissipation plate, a plurality of S-shaped heat dissipation fins and a plurality of heat dissipation columns. The plurality of S-shaped heat dissipation fins are fixedly connected to the heat dissipation plate and are sequentially distributed on one side of the heat dissipation plate. A heat dissipation channel is provided between two adjacent S-shaped heat dissipation fins. The plurality of heat dissipation columns are fixedly connected to the heat dissipation plate and are sequentially distributed inside the heat dissipation channel. The S-shaped heat dissipation fin has a plurality of grooves.

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