CN216390830U

CN216390830U - High cost performance structure motor drive circuit board

Info

Publication number: CN216390830U
Application number: CN202121110404.8U
Authority: CN
Inventors: 胡东伟
Original assignee: Jiangsu Michael Electronic Technology Co ltd
Current assignee: Sichuan Fuyuansheng Electronic Technology Co.,Ltd.
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2022-04-26
Anticipated expiration: 2031-05-24

Abstract

The utility model relates to the technical field of motor drive control, in particular to a motor drive circuit board with a high cost performance structure, which comprises an aluminum strip provided with three-phase upper and lower bridge MOS and a PCB board with a drive control circuit, wherein the aluminum strip provided with the three-phase upper and lower bridge MOS is placed in the middle of the PCB board and is connected with the PCB board through MOS pipe pins, the drive control board comprises a U-phase upper and lower bridge drive absorption circuit which is arranged on two sides of the U-phase upper and lower bridge MOS of the aluminum strip, a V-phase upper and lower bridge drive absorption circuit which is arranged on two sides of the V-phase upper and lower bridge MOS of the aluminum strip, and a W-phase upper and lower bridge drive absorption circuit which is arranged on two sides of the W-phase upper and lower bridge MOS of the aluminum strip. The layout reduces the area of the PCB and the length of the output wire harness, meanwhile, the absorption effect of each electrolytic capacitor is enhanced, each path of driving absorption circuit has better effect, the reverse peak voltage of each path of MOS is effectively controlled, the performance of the whole circuit is improved, and the cost is reduced.

Description

High cost performance structure motor drive circuit board

Technical Field

The utility model relates to the technical field of motor drive control, in particular to a motor drive circuit board with a high cost performance structure.

Background

Along with the country to the environmental protection, the gradual improvement of energy-conserving index requirement, in the motor application, brushless motor replaces brush motor and alternating current motor and has been a development trend, current brushless motor drive circuit board is because the parallelly connected use of many MOS pipes needs the great fin of installation, lead to motor drive control panel to receive very big limitation in the aspect of the overall arrangement, motor drive absorption circuit etc. can not reach fine effect, and the PCB face is bulky, the PCB board low-usage, cause it can't satisfy the use in the installation of part needs little volume, and cost increase, be unfavorable for the environmental protection requirement.

Disclosure of Invention

The utility model provides a motor driving circuit board with a high cost performance structure.

In order to solve the technical problems, the motor driving circuit board with the high cost performance structure comprises an aluminum strip provided with three-phase upper and lower bridge MOS and a PCB board with a driving control circuit, wherein the aluminum strip provided with the three-phase upper and lower bridge MOS is placed in the middle of the PCB board and is connected with the PCB board through MOS pipe pins, the PCB board with the driving control circuit comprises a U-phase upper and lower bridge driving absorption circuit arranged on two sides of the U-phase upper and lower bridge MOS of the aluminum strip, a V-phase upper and lower bridge driving absorption circuit arranged on two sides of the V-phase upper and lower bridge MOS of the aluminum strip, and a W-phase upper and lower bridge driving absorption circuit arranged on two sides of the W-phase upper and lower bridge MOS of the aluminum strip.

Preferably, the system also comprises a position detection circuit and an MCU control circuit, wherein the U-phase upper and lower bridge driving absorption circuit, the V-phase upper and lower bridge driving absorption circuit, the W-phase upper and lower bridge driving absorption circuit are connected with the MCU control circuit, the U-phase upper and lower bridge driving absorption circuit are connected with the U-phase permanent magnet motor through an upper and lower bridge MOS, the V-phase upper and lower bridge driving absorption circuit are connected with the V-phase permanent magnet motor through an upper and lower bridge MOS, and the W-phase upper and lower bridge driving absorption circuit are connected with the W-phase permanent magnet motor through an upper and lower bridge MOS.

Preferably, the device also comprises an anode copper bar and a cathode copper bar, wherein the anode copper bar is placed beside the road bridge MOS, the cathode copper bar is horizontally packaged and horizontally placed beside the road bridge MOS, and the lower surface of an aluminum bar provided with three-phase upper and lower bridge MOS is arranged below the road bridge MOS.

Preferably, the power supply circuit is provided with a plurality of electrolytic capacitors, and is connected with the MCU control circuit and used for supplying power to the MCU control circuit, the electrolytic capacitors are respectively installed at the nearest positions of the U-phase, V-phase and W-phase upper bridge drive absorption circuits, and the pins of the electrolytic capacitors are connected in parallel through copper foils with the area larger than a set area.

Preferably, the controller also comprises a functional line output interface distributed at the position of the outlet of the whole controller.

Preferably, the permanent magnet motor further comprises connecting terminals, wherein two power connecting terminals are respectively connected with the positive electrode of the power supply and the ground wire of the power supply and are arranged at the position of a wire outlet of the controller, and the other three connecting terminals are respectively connected with the U, V and W of the permanent magnet motor and are respectively arranged near the MOS of the U, V and W phase lower bridge.

Preferably, the device also comprises a permanent magnet motor phase line current sampling circuit, wherein the permanent magnet motor phase line current sampling circuit is formed by connecting N constantan wires in parallel, is connected with the MCU control board and is placed between the negative copper bar and the power ground wire.

Preferably, the position detection circuit comprises a phase line voltage division detection circuit and a motor rotor position hall detection circuit.

After the structure is adopted, the utility model provides a motor drive control panel, which comprises an aluminum strip provided with three-phase upper and lower bridge MOS (metal oxide semiconductor) arranged in the middle of the motor drive control panel, corresponding U-phase upper and lower bridge drive absorption circuits arranged on two sides of the aluminum strip provided with the three-phase upper and lower bridge MOS, power supply electrolytic capacitors respectively arranged at positions near the corresponding upper bridge drive absorption circuits, a positive copper strip arranged on the edge of the upper bridge MOS, a negative copper strip arranged at the bottom of the aluminum strip, a functional wire output interface, and positive and negative power supply output terminals arranged at the outlet position of the whole controller.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic diagram of an MCU control circuit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a power circuit according to the present invention;

FIG. 3 is a U-phase upper and lower bridge driving absorption circuit diagram according to the present invention;

FIG. 4 is a V-phase upper and lower bridge driving absorption circuit diagram in accordance with the present invention;

fig. 5 is a W-phase upper and lower bridge driving absorption circuit diagram according to the present invention.

Detailed Description

The utility model provides a motor drive control panel, which comprises an aluminum strip provided with an upper bridge MOS and a lower bridge MOS, a U-phase upper bridge and lower bridge drive absorption circuit, a V-phase upper bridge and lower bridge drive absorption circuit, a W-phase upper bridge and lower bridge drive absorption circuit, a positive copper strip, a negative copper strip, a plurality of electrolytic capacitor power circuits, a functional output interface, a permanent magnet motor phase line current sampling circuit, a 5-number connecting terminal, a U-number connecting terminal, v, the W terminal is placed respectively in the adjacent position of the lower bridge MOS of the aluminium strip of installing upper and lower bridge MOS, power + terminal is placed in near power supply circuit that has a plurality of electrolytic capacitors and power ground terminal is placed in near permanent-magnet machine phase current sampling circuit position, MCU control circuit places in the outlet port position of motor drive control PCB board, this overall arrangement can accomplish the shortest with the function line output of whole motor drive controller inside the controller, reduce big current loop length and the PCB area in the whole motor drive control PCB board and reduce by a wide margin (only 70% of the traditional product PCB area of the same model).

As an embodiment, the driving circuit of the present invention further comprises

The position detection circuit is used for sending the running position of the permanent magnet motor to the MCU control circuit; the MCU control circuit is used for respectively generating a U-phase upper and lower bridge driving signal, a V-phase upper and lower bridge driving signal and a W-phase upper and lower bridge driving signal according to the running position of the permanent magnet motor, and respectively sending the U-phase upper and lower bridge driving signal, the V-phase upper and lower bridge driving signal and the W-phase upper and lower bridge driving signal to the U-phase upper and lower bridge driving absorption circuit, the V-phase upper and lower bridge driving absorption circuit and the W-phase upper and lower bridge driving absorption circuit to respectively drive each MOS and drive the permanent magnet motor to run. In this embodiment, the position detection circuit includes a phase line voltage division feedback circuit and a motor rotor position hall feedback circuit, and when the motor rotor position hall feedback circuit fails, the phase line voltage division feedback circuit is used to detect the operating position of the permanent magnet motor, so that the convenience of use is improved.

In this embodiment, a circuit schematic diagram of the MCU control circuit is shown in fig. 1, a power supply circuit schematic diagram is shown in fig. 2, a U-phase driving absorption circuit schematic diagram is shown in fig. 3, a V-phase driving absorption circuit schematic diagram is shown in fig. 4, and a W-phase driving absorption circuit schematic diagram is shown in fig. 5. In fig. 2, EC406, EC407, EC409, EC410, and EC411 are five electrolytic capacitors.

As an embodiment, the control board of the present invention further includes: the positive copper bar and the negative copper bar are placed near the upper bridge MOS of the aluminum bar provided with the upper bridge MOS and the lower bridge MOS, so that the fluctuation difference of power supply voltage of each path of MOS in a large current state can be reduced, and the effect of three-phase current balance is achieved. The negative pole copper bar place in below the aluminium strip of installing upper and lower bridge MOS, hug closely the PCB board top layer, connect through PCB board bottom copper foil and the electrolytic capacitor negative pole of placing near MOS, reduce whole circuit heavy current loop through the area of strengthening the negative pole copper foil, make electrolytic capacitor's absorption reach better effect, and arrange in below the aluminium strip of installing upper and lower bridge MOS, make full use of PCB face is long-pending, can play the effect that reduces PCB board area.

As an embodiment, the drive control circuit of the present invention further includes: the power supply circuit is provided with a plurality of electrolytic capacitors and is connected with the MCU control circuit and used for supplying power to the MCU control circuit; in each electrolytic capacitor, the EC407 and the EC408 are placed at the position of the U-phase circuit, mainly the U-phase circuit plays a main absorption role when entering the switch state, and the EC409 is placed at the position of the V-phase circuit, mainly the V-phase circuit plays a main absorption role when entering the switch state. The EC410 is placed at the position of the W-phase circuit, the main absorption circuit is mainly played when the W-phase circuit enters the switch state, the copper cladding exceeding the set area is arranged between the negative copper strip and each electrolytic capacitor, the EC407, the EC408, the EC409 and the EC410 electrolytic capacitors can play the absorption and filtering role to the maximum extent when each phase circuit enters the switch state, and the EC406 is placed at the two ends of the input power supply and provides the power supply filtering role when the three-phase circuit works in the switch state.

As an implementation mode, an upper bridge driving absorption circuit in the U-phase upper and lower bridge driving absorption circuit is connected with N MOS, and a lower bridge driving absorption circuit is connected with N MOS, where N is a positive integer greater than 1; the upper bridge driving absorption circuit is arranged in a set range of each MOS tube, and the closer the upper bridge driving absorption circuit is, the better the upper bridge driving absorption circuit is; the same principle applies to the same layout mode in the use of V-phase and W-phase circuits.

As shown in fig. 3, the upper bridge driving snubber circuit composed of R101, R102, R103, R104, R105, R106, R107, D101, D102, C101, Q102, Q103 and EC101 has elements that are as close as possible to MOS such as PQ101 in the circuit layout, so that internal oscillation generated in MOS such as PQ101 in the switching transistor state is more easily absorbed. Similarly, a lower bridge drive absorption circuit including MOS devices such as R108, R109, R110, R111, R112, R113, Q105, Q106, C102, and PQ103 has the same principle. The same principle is used in V-phase and W-phase circuits.

The working principle of the utility model is that after the whole machine is powered on, the MCU control circuit enters a starting state after SP signals are sent to the outside. The MCU7 outputs a low level through the WT pin to the switching tube driving absorption circuit R302 to turn on Q301 and turn on Q302 to turn on the switching tubes PQ301 and PQ302, and the W-phase upper bridge output power is positive. The MCU7 outputs a low level through the VB pin to the MOS driver snubber circuit R209 to turn on Q204 and turn on Q205 to turn on the MOS transistors PQ204 and PQ205, and the V-phase lower bridge output power is negative. The MCU7 reads a phase line voltage division feedback network formed by R501, R504 and C502 through

pins

2, 3 and 4 of the chip to acquire the running position of the permanent magnet motor or the MCU7 acquires the running position of the permanent magnet motor through a motor rotor position Hall feedback circuit, and then outputs corresponding driving signals to UT, VT, WT, UB, VB and WB to control a driving absorption circuit to drive a corresponding U, V, W to output and drive the permanent magnet motor to run in turn, so that the aim of rotating the motor is fulfilled.

The aluminium strip of installing upper and lower bridge MOS places the centre at motor drive control PCB board, U, V, the heat that each way MOS produced in W three phase circuit work sends the heat to the controller shell through this aluminium strip heat conduction and dispels the heat, anodal copper strip, negative pole copper strip, and a plurality of electrolytic capacitor's power supply circuit through reasonable layout, use the parallelly connected internal oscillation when can furthest's reduction MOS pipe entering switch operating condition of large tracts of land copper foil, make whole circuit performance more stable in work, MOS pipe calorific capacity is lower, the radiating effect is better, the little volume and the high performance of PCB board make it both reduce the cost, the installation degree of difficulty, still promoted the effect, higher price/performance ratio has been reached.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.

Claims

1. The utility model provides a high price/performance ratio structure motor drive circuit board which characterized in that: the PCB with the drive control circuit comprises a U-phase upper bridge and lower bridge drive absorption circuit arranged on two sides of the U-phase upper bridge and lower bridge MOS of the aluminum strip, a V-phase upper bridge and lower bridge drive absorption circuit arranged on two sides of the V-phase upper bridge and lower bridge MOS of the aluminum strip, and a W-phase upper bridge and lower bridge drive absorption circuit arranged on two sides of the W-phase upper bridge and lower bridge MOS of the aluminum strip.

2. A cost-effective structural motor-driving circuit board as claimed in claim 1, wherein: the permanent magnet motor drive circuit comprises a U-phase upper and lower bridge drive absorption circuit, a V-phase upper and lower bridge drive absorption circuit, a W-phase upper and lower bridge drive absorption circuit, an upper and lower bridge MOS and an MCU control circuit, wherein the U-phase upper and lower bridge drive absorption circuit is connected with the MCU control circuit, the U-phase upper and lower bridge drive absorption circuit is connected with the U-phase permanent magnet motor through an upper and lower bridge MOS, the V-phase upper and lower bridge drive absorption circuit is connected with the V-phase permanent magnet motor through an upper and lower bridge MOS, and the W-phase upper and lower bridge drive absorption circuit is connected with the W-phase permanent magnet motor through an upper and lower bridge MOS.

3. A cost-effective structural motor-driving circuit board as claimed in claim 1, wherein: the three-phase bridge-type solar cell is characterized by further comprising an anode copper bar and a cathode copper bar, wherein the anode copper bar is placed beside the upper bridge MOS of each road, the cathode copper bar is horizontally packaged and horizontally placed beside the lower bridge MOS of each road, and the lower side of an aluminum bar of the upper bridge MOS and the lower bridge MOS of the three phase are installed.

4. A cost-effective structural motor-driving circuit board as claimed in claim 2, wherein: the electrolytic capacitor is respectively arranged at the nearest positions of the U-phase, V-phase and W-phase upper bridge drive absorption circuits, and the pins of the electrolytic capacitors are connected in parallel through copper foils with the area larger than a set area.

5. A cost-effective structural motor-driving circuit board as claimed in claim 1, wherein: the controller also comprises functional line output interfaces distributed at the positions of the wire outlets of the whole controller.

6. A cost-effective structural motor-driving circuit board as claimed in claim 1, wherein: the permanent magnet motor power supply further comprises connecting terminals, wherein two power connecting terminals are respectively connected with the positive electrode of the power supply and the ground wire of the power supply and are placed at the position of a wire outlet of the controller, and the other three connecting terminals are respectively connected with the U, V and W of the permanent magnet motor and are respectively placed beside the MOS close to the U, V and W phase lower bridge.

7. A cost-effective structural motor-driving circuit board as claimed in claim 1, wherein: the permanent magnet motor phase line current sampling circuit is formed by connecting N constantan wires in parallel, is connected with the MCU control board and is placed between the negative copper bar and the power ground wire.

8. A cost-effective structural motor-driving circuit board as claimed in claim 2, wherein: the position detection circuit comprises a phase line voltage division detection circuit and a motor rotor position Hall detection circuit.