Motor driving system and electric appliance device

Abstract

The utility model discloses a motor driving system and an electric appliance device. The system comprises a first substrate and a second substrate; wherein the heat dissipation performance of the second substrate is better than that of the first substrate; the control circuit is arranged on the first substrate and is used for outputting a control signal; and the power driving circuit is arranged on the second substrate, is electrically connected with the control circuit through the first substrate and the second substrate, and is used for outputting a driving signal based on the control signal, and the motor works based on the driving signal.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of circuit, especially motor drive system and electrical device. BACKGROUND

[0002] The electrical device based on motor drive, such as range hood, usually includes motor, motor drive part and structural member. Among them, the motor drive part is used to drive control motor, usually including chip, transformer, power device and passive element etc., these devices are all installed to FR1 or FR4 circuit board. When the motor is medium and large power specification, the corresponding power device generates heat seriously, and the surface of power device will be installed with cooling fin to dissipate heat, and the process of installing cooling fin is complicated and time-consuming, which reduces the production efficiency of motor drive part. SUMMARY

[0003] The motor drive system according to the embodiment of the utility model, including: first substrate and second substrate, wherein the heat dissipation performance of second substrate is superior to the heat dissipation performance of first substrate, control circuit for outputting control signal is arranged on first substrate, and power drive circuit for outputting drive signal based on control signal is arranged on second substrate, and the control circuit is electrically connected with the control circuit through first substrate and second substrate, and the motor works based on drive signal.

[0004] The electrical device according to the embodiment of the utility model, including: above-mentioned motor drive system, and the motor connected with motor drive system. BRIEF DESCRIPTION OF DRAWINGS

[0005] The utility model can be better understood from the following description of the specific implementation of the utility model in combination with the drawings, wherein:

[0006] Figure 1 The electric connection schematic diagram of the motor drive system according to the embodiment of the utility model is shown.

[0007] Figure 2 The layout schematic diagram of power drive circuit on second substrate according to the embodiment of the utility model is shown.

[0008] Figure 3 The structure schematic diagram of a kind of first substrate and second substrate according to the embodiment of the utility model is shown.

[0009] Figure 4 Another structure schematic diagram of a kind of first substrate and second substrate according to the embodiment of the utility model is shown. DETAILED DESCRIPTION

[0010] The features and exemplary embodiments of each aspect of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application. The present application is in no way limited to any specific configuration set forth below, but covers any modifications, replacements, and improvements of elements and components without departing from the spirit of the present application. In the accompanying drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessary obscuring of the present application. In addition, it should be noted that the phrase "A is connected to B" used herein can mean that "A is directly connected to B" or "A is indirectly connected to B via one or more other elements".

[0011] In view of the complicated and time-consuming process of adding heat dissipation fins to the power device of the motor, the motor driving system and the electric appliance device according to the embodiments of the present application are provided, wherein the control circuit in the motor driving system is arranged on the first substrate, the power driving circuit with relatively large heat generation power is arranged on the second substrate with relatively high heat dissipation performance, the second substrate simultaneously dissipates heat for the power driving circuit, and the process of originally adding heat dissipation fins to the power device is omitted, thereby improving the production efficiency.

[0012] Figure 1 A schematic diagram of the electrical connection of the motor driving system according to the embodiments of the present application is shown. As shown in Figure 1 The motor driving system according to the embodiments of the present application includes a first substrate 101 and a second substrate 102, wherein the heat dissipation performance of the second substrate 102 is better than that of the first substrate 101. A control circuit 103 is arranged on the first substrate 101 and is used to output a control signal. A power driving circuit 104 is arranged on the second substrate 101 and is electrically connected to the control circuit 103 through the first substrate 101 and the second substrate 102, and is used to output a driving signal based on the control signal, wherein the motor works based on the driving signal. In the motor driving system according to the embodiments of the present application, the control circuit 103 outputs the control signal, and the power driving circuit 104 outputs the driving signal based on the control signal. Taking a three-phase DC motor as an example, the control circuit 103 outputs six PWM (Pulse Width Modulation) signals as the control signal, and the power driving circuit 104 can adopt a three-phase full-bridge driving structure, thereby outputting three-phase driving signals based on the six PWM signals to drive the three-phase DC motor.

[0013] Figure 2 A layout schematic diagram of the power driving circuit on the second substrate according to the embodiments of the present application is shown. As shown inFigure 2 As shown, the power drive circuit with a three-phase full-bridge drive structure includes six power drive transistor devices and several supporting passive components. The power drive transistor devices can be IGBT (Insulated Gate Bipolar Transistor) or MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). Figure 2 The types, models, and layout of components used in medium-power drive circuits can be adjusted according to actual conditions, and no restrictions are imposed here.

[0014] like Figure 1 In the motor drive system shown, the control circuit 103 is used to output control signals to realize the motion control of the motor. The motion control includes conventional motor operation, overcurrent threshold detection, back electromotive force detection, bus voltage detection, etc.

[0015] In the motor drive system of this utility model embodiment, the heat dissipation performance of the second substrate 102 is better than that of the first substrate 101, and the heat generation power of the control circuit 103 is less than that of the power drive circuit 104. By placing the power drive circuit 104 on the second substrate 102, the power drive circuit 104 can be cooled by the second substrate 102, eliminating the need to install heat sinks on the power drive circuit 104 and saving the original process of installing heat sinks on the power drive circuit 104, thereby improving the production efficiency of the motor drive system.

[0016] In the motor drive system of this embodiment, since the heat dissipation performance of the second substrate 102 is required to be better than that of the first substrate 101, the second substrate 102 can be a metal-based copper-clad laminate, specifically an aluminum substrate, a copper substrate, or a copper-aluminum composite substrate. Aluminum substrates have lower costs, further reducing overall manufacturing costs. Correspondingly, the heat dissipation performance requirement for the first substrate 101 is lower, and it can be a substrate based on epoxy resin. The heat dissipation performance of the metal-based copper-clad laminate is significantly better than that of the epoxy resin substrate. The metal-based copper-clad laminate helps to quickly dissipate the heat generated by the components mounted on it, preventing the operating temperature of the components and the substrate from rising.

[0017] In some embodiments, the motor drive system further includes a pre-drive circuit located on a first substrate or a second substrate; the control circuit is electrically connected to the power drive circuit through the pre-drive circuit, the first substrate, and the second substrate; the pre-drive circuit is used to preprocess the control signal. Figure 1In the shown electric connection schematic diagram, the pre-driver circuit 105 is arranged on the first substrate 101, and the pre-driver circuit 105 is connected to the control circuit 103 and the power driver circuit 104, receives the control signal, and outputs the control signal to the power driver circuit 104 after signal pre-processing (such as voltage boosting and driving capacity enhancement) of the control signal. In addition, the pre-driver circuit can also be arranged on the second substrate, or part of the pre-driver circuit is arranged on the first substrate and the other part is arranged on the second substrate. The pre-driver circuit can include a pre-driver chip, a capacitor, a resistor, and a diode. The pre-driver chip can be a separate chip, or can be integrated with the control circuit on the same chip.

[0018] In some embodiments, the motor driving system further includes a power supply circuit arranged on the first substrate or the second substrate, for providing a power supply voltage for the control circuit and the power driver circuit. As shown in the electric connection schematic diagram, Figure 1 In the shown electric connection schematic diagram, the power supply circuit 106 is arranged on the first substrate 101. In addition, the power supply circuit can also be arranged entirely on the second substrate, or part of the power supply circuit is arranged on the first substrate and the other part is arranged on the second substrate. The power supply circuit is used to provide a power supply voltage for the control circuit and the power driver circuit. Specifically, the power supply circuit rectifies the input alternating current into direct current output, thereby providing a power supply voltage for the control circuit and the power driver circuit. The power supply circuit can adjust the voltage level of the direct current, that is, output direct current with different voltage levels, for example Figure 1 As shown, the power supply circuit 106 outputs three direct currents with different voltage levels, which are high-voltage direct current such as 315V, lower direct current such as 15V, and low-voltage direct current such as 5V. The high-voltage direct current is used to power the power driver circuit, the lower direct current is used to power the pre-driver circuit 105, and the low-voltage direct current is used to power the pre-driver circuit 105 and the control circuit 103.

[0019] In some embodiments, the motor driving system further includes a signal interaction circuit connected to the control circuit, for performing at least one of the following actions: generating a state signal based on the control signal of the control circuit, and transmitting an instruction signal issued by an instruction input device to the control circuit, wherein the state display device acts based on the state signal, and the control circuit outputs the control signal based on the instruction signal. The state display device can represent the working state of the current motor driving system by transforming its own state, which specifically includes a buzzer, an indicator light, a display panel, etc. The instruction input device is a device that receives user instructions and generates an instruction signal, such as a key, a knob, etc. As shown in the electric connection schematic diagram, Figure 1As shown, the signal interaction circuit 107 can be disposed on the first substrate 101 and connected with the control circuit 103, and can receive the control signal of the control circuit 103 and generate a state signal based on the control signal and send the state signal to the state display device. The state display device will act based on the state signal (for example, the indicator light is on or off, the buzzer is buzzing or silent, the display panel displays the corresponding pattern, etc.) to represent the current control signal. The signal interaction circuit 107 can also receive the instruction signal (for example, on, off, adjust the motor speed, etc.) sent by the instruction input device and send it to the control circuit 103. The control circuit 103 generates a corresponding control signal output after receiving the instruction signal. As shown in the figure, Figure 1 As shown, the low-voltage direct current output by the power supply circuit 106 can also power the signal interaction circuit 107. The state display device and the instruction input device can be disposed on the first substrate or outside the first substrate according to the structural layout requirements, which is not limited here. In some embodiments, the signal interaction circuit can also include an optocoupler isolation communication circuit. The optocoupler isolation communication circuit can effectively isolate the control circuit and the instruction input device and the state display device on the basis of signal transmission, avoid interference and damage between the two circuits, and improve the safety and reliability of the circuit.

[0020] In the motor drive system of the embodiment of the utility model, the electrical connection path between the control circuit and the power drive circuit includes the electrical connection between the control circuit and the first substrate, the electrical connection between the first substrate and the second substrate, and the electrical connection between the second substrate and the power drive circuit. Based on this, the first substrate and the second substrate are usually electrically connected through a gold finger or a pin array, and the first substrate and the second substrate are usually assembled in a straight-in type or a horizontal type. Figure 3 and Figure 4 Two structural schematic diagrams of a first substrate and a second substrate according to the embodiment of the utility model are shown. As shown in the figure, Figure 3 As shown, the first substrate 101 and the second substrate 102 are assembled in a straight-in type; as shown in the figure, Figure 4 As shown, the first substrate 101 and the second substrate 102 are assembled in a horizontal type. If the second substrate 102 is located above the first substrate 101, the circuit power device disposed on the second substrate 102 is disposed on the upper surface of the second substrate 102, and the first substrate 101 and the second substrate 102 are connected through a connector, which is a pin array 108 here. The connection of the first substrate and the circuit (such as the control circuit, the pre-drive circuit, the power supply circuit, the signal interaction circuit) disposed on the first substrate, and the connection of the second substrate and the circuit (such as the power drive circuit, the pre-drive circuit, the power supply circuit) disposed on the second substrate are similar to the first substrate and the second substrate, and can be assembled in a straight-in type or a horizontal type, and can be electrically connected between the two parts through a gold finger or a pin array or other connectors, which is not limited here.

[0021] In other embodiments, an appliance is also provided, which includes the motor drive system as described above; and a motor connected with the motor drive system. The appliance can further include a structural member cooperating with the motor, for example, when the appliance is a range hood, the structural member is used to cooperate with the motor to control the direction of the flue gas.

[0022] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided, such as examples of programming, software modules, user selections, network transactions, database queries, database structures, hardware modules, hardware components, hardware blocks, etc., to provide a thorough understanding of embodiments of the subject matter. One skilled in the relevant art will recognize, however, that the subject matter can be practiced without one or more of the

[0023] Those skilled in the art will understand that the above-described embodiments are merely exemplary and not limiting. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on the drawings, the specification and the claims, those skilled in the art should understand and implement other changed embodiments of the disclosed embodiments. The fact that certain technical features appear in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. An electric motor drive system, characterized by, Comprising: a first substrate and a second substrate; wherein the heat dissipation performance of the second substrate is superior to that of the first substrate; a control circuit provided on the first substrate, configured to output a control signal; and a power drive circuit provided on the second substrate, electrically connected with the control circuit through the first substrate and the second substrate, configured to output a drive signal based on the control signal, wherein a motor operates based on the drive signal.

2. The motor drive system of claim 1, wherein, Further comprising a pre-drive circuit located on the first substrate or the second substrate; the control circuit is electrically connected with the power drive circuit through the pre-drive circuit, the first substrate and the second substrate; the pre-drive circuit is configured to perform signal preprocessing on the control signal.

3. The motor drive system according to claim 1, wherein: the first substrate and the second substrate are assembled in a straight-in or horizontal manner.

4. The motor drive system of claim 1, wherein, the first substrate and the second substrate are electrically connected through a gold finger or a pin.

5. The motor drive system of claim 1, wherein, Further comprising a power supply circuit located on the first substrate or the second substrate, configured to provide a power supply voltage for the control circuit and the power drive circuit.

6. The motor drive system of claim 1, wherein Further comprising a signal interaction circuit connected with the control circuit, configured to perform at least one of the following actions: generating a state signal based on the control signal of the control circuit, transmitting an instruction signal issued by an instruction input device to the control circuit, wherein a state display device operates based on the state signal, and the control circuit outputs the control signal based on the instruction signal.

7. The motor drive system according to any one of claims 1 to 6, characterized by, The second substrate is a metal-based copper-clad plate.

8. The motor drive system of claim 7, wherein, The metal-based copper-clad plate is specifically one of an aluminum substrate, a copper substrate and a copper-aluminum composite substrate.

9. The motor drive system of claim 7, wherein, The first substrate is a substrate based on an epoxy resin plate material.

10. An electrical appliance device, characterized by Comprising: the motor drive system according to any one of claims 1 to 9; and a motor connected with the motor drive system. ​

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