Amplifier switching power supply module control circuit

Amplifier switching power supply module control circuit




The control circuit in order to DSPTFMS320F2812 as the core, mainly including the creation of phase-shifted pulse, real-time sampling, power regulation, over-voltage protection, over-current protection, over power protection, filtering algorithms and full-bridge phase-shifting algorithm functions. TMS320F2812 built using 16-way 12-bit high-resolution A / D converter circuit voltage, current real-time sampling. The minimum conversion time per channel is 80 ns, A / D converter circuit of the input signal level range of 0 ~ 3 V. After sampling, through the software programming to adjust driving full-bridge power inverter switch the phase angle shift PWM waveform to achieve regulation, at the same time when the output voltage when the current is too high or under-voltage, DSP call the appropriate subroutine to handle unexpected abnormal event , has protective effects. At the same time through the A / D sampling operation the output voltage and current signals, can accurately measure the output power and adjust the associated event manager registers to regulate the output voltage values.

Controller's dynamic performance and precision regulator performance and regulator design are closely linked. In the amplifier switching power supply design, using incremental PID control algorithm.



Amplifier Switching Power Supply Software Design

Amplifier Switching Power Supply DSP-based software design to achieve the following main functions:

(1) full-bridge phase-shifted pulse generation using TMS320F2812 Event Manager directly to the two compare unit output circuit pulse. From the basic principles of phase-shifting point of view, hysteresis bridge arm between the forearm relative to the super-drive there is a periodic delay, the delay angle namely, phase-shifting angle. Set by the compare unit PWM1/PWM2 output were driving a super-forearm switch VQ1, VQ3, by PWM3/PWM4 output compare unit 2 driver lag arm switch VQ4, VQ2. Each bridge arm, under the driving pulse between the two complement each other and the dead-zone, fixed bridge arm ahead of the driving time in a weekly period 0 given, then as long as the delay in phase-shift angle φ corresponds to the time, the recurrence of the incident can be compared lagging-leg of the driving pulse in order to achieve range of 0 ° ~ 180 ° freedom of movement within the phase.

(2), over-voltage, over current, over-power detection and protection of DSP-based amplifier switching power supply with over-voltage, over current, over power, over-temperature protection. When an exception occurs. System access exception interrupt service subroutine for processing, and timely PWM output latch. In order to prevent malfunction and set to read 20 consecutive abnormal signals was identified as the circuit abnormalities, or not taking action.



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