In the design of the DC motor drive circuit, mainly consider the following points:
Function:
Is the motor not a one-way or two-way? Do you need to speed up? For one-way motor drive, as long as a high-power triode or field effect tube or relay can directly drive the motor, when the motor needs two-way rotation, the H-bridge circuit consisting of four power components can be used or using a double knife double. Throwing relay. If you do not need to speed up, just use the relay to be used; but if you need to speed up, the switching element such as a triode, the field effect tube can implement the PWM (pulse width modulation) speed.
performance:
For the motor drive circuit of the PWM speed, there is mainly the following performance indicators.
1) Output current and voltage range, which determines the motor that can drive multiple power.
2) Efficiency, high efficiency not only means saving power, but also reduces the fever of the drive circuit. To increase the efficiency of the circuit, you can start from the switch of the switch to the power device and prevent a problem that the H-bridge or push-pull circuit may occur, that is, two power devices simultaneously turn on the power supply short circuit.
3) The impact on the control input. The power circuit should have good signal isolation on its input to prevent high voltage large currents from entering the main control circuit, which can be isolated with a high input impedance or photocoupler.
4) The impact on the power supply. Candidity can cause the instantial decline in the power supply voltage to cause high-frequency power supply; large currents may cause ground potential floating.
5) Reliability. The motor drive circuit should do as much as possible, no matter what control signal, what passive load, the circuit is safe.
1, Freescale motor drives 4MOS motor drive module
The Freescale motor drive is based on IR2104 + IRF3205MOS tube design to achieve a 4MOS single motor drive function.
Attachment content PCB source file (does not include a schematic), open with AD software.
2, L298N motor drive plate module dual H bridge motor drive module
Wiring description:
1. Power interface: The module is powered, the input voltage is 5V to 35V.
2. Dual motor interface: two ends of the motor.
3. Single chip interface: IN1 ~ IN4 corresponds to the microcontroller IO port, sequentially controls the motor 1 to the motor 2.
4.5V Power Introduction: A set of logic levels.
Product parameters:
Power input voltage range:
• Maximum power: 50W (all the way L298N max is 25W)
• Drive peak current: 4A
• Logical partial power supply range: + 5V ~ + 7 (on the board for recommended logic voltage 5V)
• Logical partial power supply: 0 ~ 36mA
• Storage temperature: -20 degrees Celsius -135 degrees Celsius
• Control the input voltage range: low level -0.3V ~ 1.5V. High level 2.3V ~ power supply voltage
3. Motor drive module DC motor driver 100A dual super high power H-bridge optocoupler isolation
The optocoupler isolation version ultra-wide voltage motor driver (up to 60V), can generally reach 48V, the module uses 10M high-speed optocoupler to isolate the input signal, effectively prevent the drive plate interference signal from interference from the control panel, Make the system more stable and reliable, and this module adopts high quality brand new original power tube, so the maximum rated current is up to 100A.
This module uses AVAGO optocouplers HCPL-2631, which can be used for the driving of general power DC motors, the maximum current can reach 100A, and the performance is stable, and it is a general integrated motor drive. Therefore, it is very suitable for the robot contest. Battle Motor Competition, Freescale Play, etc.
Drive module features:
• The basic components of the driving module are patch, the integration is high, the plate layout is well-designed, very beautiful, small size, onboard two high-power DC motor drive, drive module size is only 82mm * 70mm;
• Wide taps can be effective in driving modules, and maintain a good stability of the module during high current.
• When driveing the motor, the module maximum rated current can reach 100A, and the on-resistance is only 0.0015 ohms;
• High switching frequency, up to 60kHz, which effectively avoids unpleasantness of debugging motor frequencies;
• The control interface is very simple: A1.A2 = 0.0 is brake; A1.A2 = 1.0 is positive transfer; A1.A2 = 0.1 is inversion; PA is PWM wave input (motor speed adjustment); G is controlled Plate Circular Pin (B Road is equally controlled);
• 3.3V and 5V microcontrollers can control this module and only need a motor power supply (12V ~ 48V);
4, step high-efficiency motor driver with SN755410 motor driver IC
Our motor driver circuit can be built around L293D or SN754410 IC. The L293D is four times large current half H driver. Within a voltage range of 4.5V to 36V, it provides two-way currents up to 600 mA. The integrated circuit consists of two H-bridges, which can drive two DC motors or stepping motors, and solenoids, relays, and other electrolyte loads. However, SN754410 is a better pin for the L293D IC to replace the pin. It provides up to 1A of the two-way current in the same voltage range as the L293D. It also has some security functions, such as automatic shutdown, overcurrent protection, etc.
The circuit is very simple, we only need to follow the IC's pin map. Typically, the two enable pins and 5V VCC pins of the IC are connected to always enable the output. We need to connect the output of the switching circuit in the figure to a A switching circuit to the VCC pin of the IC. In addition, it is preferred to use a 0.1uF capacitor to prevent radiation of electrical type peaks at both ends of the motor.
Then we will use the connector so that we can easily connect the power and electric motors. The motor VCC is connected to another 2 pin screw terminal. 5V, GND and triggers should be applied from the outside, so 3-pin connector is used. Then, for the input and output of the motor and signal, we will use two 4-pin connector.
After welding all components and connectors, we have made high efficiency and easy-to-use motor drivers. Now you can close the driver without using the driver and to make it active, apply a high pulse from Arduino to trigger the pin or any other controller for use. Read the full article, original title: 8 motor drive design plans to take you first-integration
Article Source: [Micro Signal: Cirmall, WeChat public number: Circuit Design Skills] Welcome to add attention! Please indicate the source of the article.
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