s
SWITCH-MODE
RECTIFIERS
Introduction
Quasar is a line of switch-mode rectifiers designed to meet all galvanic surface treatment requirements. Based on high speed IGBT technology, they provide high efficiency and performance. Quasar rectifiers adopt pulse width modulation (PWM) technique for the controlling of current amplitude.
Machine Types
DC - Direct Current (forward)
DCR - Direct Current Reverse (forward and reverse)
PP - Pulse Plating (forward)
PPR - Pulse Plating Reverse (forward and reverse)
Main Features
Electrical features
Electrical features
Energy saving & high accuracy
> High speed IGBT technology
> Modular power platform and multi-tower interconnection
> Microprocessor controlled
> Up to 40% power saving versus Silicon Controlled Rectifier (SCR)
> Cos Ø = 0.93 at rated load
> Low output current ripple
> High precision voltage and current regulation (1000 steps)
> Fast response time and high stability to load variation (~1ms)
> High speed IGBT technology
> Modular power platform and multi-tower interconnection
> Microprocessor controlled
> Up to 40% power saving versus Silicon Controlled Rectifier (SCR)
> Cos Ø = 0.93 at rated load
> Low output current ripple
> High precision voltage and current regulation (1000 steps)
> Fast response time and high stability to load variation (~1ms)
Hardware features
Hardware features
Hardware features
Space saving & easy capacity increase
> 43 x 43cm base size and 15 to 170cm height
> Light weight (from 25kg)
> Modular and multi-tower construction
> Main switch and operator panel in the front
> All input/output connections in the back for easy access
Space saving & easy capacity increase
> 43 x 43cm base size and 15 to 170cm height
> Light weight (from 25kg)
> Modular and multi-tower construction
> Main switch and operator panel in the front
> All input/output connections in the back for easy access
Software features
Software features
Software features
> Simple output parameters and waveform programming from the operator panel, remote control or PC/PLC (current, voltage, cycle time and ramp time)
> Customized software available
> A/h and A/min meters for precise thickness and dosing pumps control
> Simple output parameters and waveform programming from the operator panel, remote control or PC/PLC (current, voltage, cycle time and ramp time)
> Customized software available
> A/h and A/min meters for precise thickness and dosing pumps control
Operation Modes
> Manual (Through operator panel or remote control)
> Automatic (Via PC or PLC)
Available Interfaces
> RS485 *
> RS232 *
> Profibus-DP
> DeviceNet
> Analogue 0-10V
> Analogue 4-20mA
* Standard feature
Cooling systems
> Manual (Through operator panel or remote control)
> Automatic (Via PC or PLC)
Available Interfaces
> RS485 *
> RS232 *
> Profibus-DP
> DeviceNet
> Analogue 0-10V
> Analogue 4-20mA
* Standard feature
Cooling systems
Air cooled system
Water cooled system
Comparison chart
| Thyristor | Switching | |||
|---|---|---|---|---|
Primary control type | Secondary control type | Monolithic voltage control | CRS PWM current control  | |
| Output current ripple | high at low voltage | high | low | < 0.5% or < 3.0% |
| Efficiency | acceptable | low | high | 87% (typ.) |
| Power factor | good | bad | high | > 93% |
| Regulation speed | slow | slow | high | very high |
| Response time to load variation | slow | slow | high | very high (≈ 1ms) |
| Accuracy | good | acceptable | very high | 1/1000 of max current or voltage |
| Shift phase | yes | yes | no | cos Ø = 1 |
| Control type | voltage / current | voltage / current | voltage / current | current / voltage |
| Parallelability (multi-tower) | possible not easy | very difficult | easy in current mode | easy in current and voltage mode |
| Losses at no load / Vout ON | high | high | low | low |
| Losses at no load / Vout OFF | low | high | low | low |
| Reverse speed (DCR & PPR type) | very slow | very slow | fastest only in current mode | fastest in both voltage and current mode |