30V 20A, 2-Phase High-Frequency H-Bridge with Integrated Finned Heat-Sink, Independent Analog Inputs for Duty-Cycle and Frequency Adjust, for 2-Phase DC Brushless Motor
Si25HFHB1-AC2-30V-20A-FHS4-6Y1, Spec Sheet (PDF)
The Si25HFHB1-AC2-30V-20A-FHS4 is a 30V 20A, microprocessor based, High-Frequency, H-Bridge with an Integrated Finned Heat Sink; intended for speed and torque control of a 2-phase brushless DC motor. Two microprocessors are used in this controller; one generates the 2-phase pulse sequence (shown on Fig. 1) that drives the H-Bridge and the second one controls the switching action of the H-Bridge. These two control signals are always out of phase by 180o (VR lags VF by 180o); independent of the pulse period (T) and the duty-cycle (t/T). These signals can be monitored on Test-Pins T6 and T7. The fast-acting H-Bridge conducts current in the forward direction as long as the control pulse VF is in a high state (VF = +5V). Similarly, the H-Bridge conducts current in the reverse direction as long as the control input VR is in a high state (VR = +5V). After each conduction phase, the inductive load (motor coil) is short circuited for 20ms discharging the stored energy in the motor coil. For the remaining part of the cycle, the H-Bridge operates in the open-circuit mode. This fast-acting H-Bridge responds to control changes within 3.5ms, producing load-voltage rise and fall-times of 4ms. All control signals are optically isolated or zener-diode protected. A bicolor LED is used to monitor the motor (or load) voltage (Red = Forward, Green = Reverse). The duty-cycle (t/T) is linearly variable from 0.10 to 0.40 by an analog input voltage (VI1,G) ranging from 0 to +5V as applied to pin I1 on connector CN6. Similarly, the pulse frequency (1/T) is linearly variable from 1.0 kHz to 2.0 kHz by an analog input voltage (VI2,G) ranging from 0 to +5V as applied to pin I2 on connector CN6. These analog signals control the motor torque (VI1,G) and motor speed (VI2,G) of the brushless DC motor. An RC integrator with time-constant of 0.25 sec is included on each analog control signal providing Soft-Start and Soft-Stop features for the motor.
A small (4.0”x3.6”x0.55”) integrated Finned Aluminum Heat-Sink is used to operate at 20A current levels. Higher current-levels (25A or 750W) can be achieved with more efficient heat-sinks. Please click on this link and read the Board Mounting Instructions and Heat Sink Selection Guide. This board operates in a wide voltage-range (9V to 30V) at max. continuous load-current of 20A. Typical applications are: 2-Phase Brushless DC Motor-Speed Controller, Differential Coil Driver, etc.
Fig 1, Output of the 2-Phase Pulse Generator, Driving the H-Bridge
A Typical Application of the Si25HFHB1-AC2-30V-20A-FHS4
In this open-loop, 2-phase, brushless DC motor application, the motor-torque (or duty-cycle) is controlled by the analog input VI1,G ; and the motor-speed (or pulse-frequency) is controlled by VI2,G connected to pins I1 and I2 respectively on CN6. These analog control signals range from 0 to +5V. Warning: The connecting wires to the Load and the Power Supply must be heavy gauge copper wire (#12 AWG or heavier) to handle the rated current level. In addition, these heavy gauge wires act as a heat sink, protecting the board from overheating.
|Si25HFHB1-AC2-30V-20A-FHS4, 30V 20A, 2-Phase High-Frequency H-Bridge with Finned Heat Sink||
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