CVD102A - application specific converter control - Plug-and-Play
Features
- Low AC Current Harmonics
- Active and Reactive Control
- Stand-alone Operation
- Regulates DC-link Voltage
- Direct Power or Current Control
- Bidirectional Power Flow
- Wide switching frequency range
- CAN or Serial Interface
- Industrial temperature range
Description
The CVD102A is a fully integrated application specific control module that allows Plug-and-Play control of 3-phase power factor correction and active front end converters and is suitable for use in motor drives, renewable energy converters, grid connected converters and battery chargers.
The CVD102A control modules heritage is Converdan’s more than 10 years of experience providing digital power and control solutions to demanding OEM customers. Applying the CVD102A in your new design is extremely easy, allowing you to accelerate your time to market while at the same time considerably reducing your development cost and risk.
The CVD102A works with several 2-level and 3-level power topologies and will control a grid connected voltage
source inverter to a specified power factor and allow control of both active and reactive current or power. In addition, it supports both unidirectional and bidirectional power flow with a seamless transition between the two, as well as different control modes including direct active/reactive power control, direct active/reactive current control and DC-link voltage control.
The high level of system integration and parameterization makes the CVD102A a perfect choice regardless of voltage and current levels, as it requires only a few externally connected passive components, to interface with the voltage and current levels present in any specific design.
Typical Application
Device Overview
The CVD102A is a fully integrated application specific control module, housed in a potted DIL-64 package measuring only (LxWxH) 84x37x9 mm. It incorporates all the required analog and digital circuitry along with advanced control loops running in optimized DSP firmware.
Highlighted system features are listed below.
Hardware
- Single supply 3.3 or 5 V operation.
- Phase voltage differential sense inputs.
- Phase current differential sense inputs with programmable limit comparators.
- DC-link voltage differential sense inputs with programmable limit comparator.
- PWM output buffers with HW output enable.
- Cycle-by-cycle trip input for immediate PWM pulse termination until next switching cycle.
- One-shot trip input for immediate PWM pulse termination.
- Digital control lines for easy control without requirement for external micro controller.
- Two digital outputs to indicate system status and faults.
- The digital I/O pins are compatible with input signals from both 3.3 V and 5 V systems.
- 32-bit high performance Floating Point DSP.
- 12-bit Analog to Digital Converters.
- +/- 0.1 % precision Voltage Reference.
- On-chip Voltage Regulator with VDD Monitor and RESET circuitry.
- On-chip Temperature Sensor.
- Protected EEPROM storage for user configurable parameters with Write Protection HW pin.
- CAN-bus interface for optional system integration with external micro controller.
- The module is specified for operation over the industrial temperature range (–40 °C to +85 °C).
Control Algorithms
- Precise grid frequency synchronization using PLL structure.
- Current waveform control using advanced Proportional Resonance controllers implemented in the stationary reference frame.
- Harmonic compensators suppress harmonics in current caused by harmonic in grid voltages.
- Individual control of active and reactive power/current.
- Automatic compensation of reactive current flowing in RFI and other filter capacitors allows controlled power factor at zero load power.
- Choice of two operating modes: DC-link voltage control or direct power control.
- Automatic current sensor offset calibration.
- Measures True-RMS grid voltage, current and power for monitoring via CAN bus.
- Detects correct grid voltage phase sequence and signals status to user.