Ramcon PWM AVR BY TSI POWER USA

Transcription

1 Ramcon PWM AVR BY TSI POWER USA

2 VRp (precision PWM voltage regulator) VRp-2000/3000/5000/7500/10000/15000 (2~7.5 kwatt, single-phase 120 vac models & 2~15 kwatt, single-phase 230 vac models, both indoor & outdoor versions are available) VRp-6000/9000/15000/22500/30000/45000 (6~22.5 kwatt, three-phase 120/208 vac models & 6~45 kwatt, three-phase 230/400 vac models, both indoor or outdoor versions are available) TSi Power Corporation Antigo, Wisconsin, USA

3 VRp vs. Other AVRs Servo-motor based or tap-switching AVRs are not suitable for sensitive load equipment such as power supplies, rectifiers using solid-state devices and air-conditioners, because of their slow response time and inherent performance limitations. VRp (precision PWM voltage regulators) can be used to protect any electronic equipment, particularly in countries with inadequate infrastructures for the generation and distribution of AC power. VRp is superior thanks to its fast 20 ms response time and cycle-by-cycle voltage regulation without interrupting the load current.

4 Operating AC Input Voltage Range and Output Regulation of VRp (for 230 vac output models) 315 V 300 V 230 V 180 V 150 V Maximum AC input Minimum AC Input (Note: Derate output capacity by 20% for voltage of 150~179V) Upper limit for sensitive electronic equipment Lower limit for sensitive electronic equipment 252 V 240 V 230 V 225 V 188 V

5 Operating AC Input Voltage Range and Output Regulation of VRp (for 115 vac output models) 157 V 145 V 115 V 90 V 75 V Maximum AC input Minimum AC Input (Note: Derate output capacity by 20% for voltage of 75~90V) Upper limit for sensitive electronic equipment Lower limit for sensitive electronic equipment 125 V 116 V 115 V 112 V 95 V

6 Charactersitics AVR Performance Comparison Chart PWM based AVR Servo-motor Relay/SCR based tap-changer (VRp) based AVR AVR Regulation interrupts power path No No Some Stability Excellent Good Good Correction speed Very fast Very slow Slow Correction time 20 ms 500~5000 ms 200~1000 ms Auto fast bypass Yes Manual Manual Voltage overshoot during mains cycling None Yes Yes Operating Input Voltage Ranger 150~315V (very wide) 160~300V (wide) 160~280V typical (narrow) Over load capacity Excellent Excellent Fair Load compatibility Excellent Good Good Limitations on load types None Some Inductive loads Reliability Excellent Good Fair Protection of Load Eqmt. Excellent Poor Fair Field Maintenance None Required None Size per watt Very Compact Compact Compact Technology PWM switched IGBTs Servo turns variable A multiplicity of relays impose impose correction transformer to impose regulation voltage on multiple buckboost voltage on buck-boost regulation voltage on primaries primary buck-boost primary Comments No moving parts and limited number of interconnections. Simple to service in the field. Requires frequent replacement of brushes. Output contactor too slow to guarantee load is not exposed to high mains voltage. Complex electronics with many interconnections and circuit boards impact performance and reliability negatively.

7 Cell Site Need for AVR Developing countries have insufficient infrastructures for the generation and distribution of electricity. Too many electricity users competing for limited available power and distribution capacity, cause significant voltage fluctuations and power interruptions. The mains voltage vary between 160 to 300V in many countries. Standard rectifier/chargers and air-conditioners are not designed to withstand such a wide input voltage window. The likely result is lower reliability and/or equipment failure possibly leading to unscheduled downtime; and increased costs for maintenance and repair.

8 Cell Site Equipment Rectifier chargers, Air-conditioning equipment, UPS in some instances, Equipment with AC input switchmode power supplies, Smoke detectors and miscellaneous equipment

9 AC Mains Input Window for Rectifiers, UPS and SMPS 330 V 264 V 245 V 240 V 220 V 184 V 140 V Shut down and/or damage Border line Operation Safe Area of Operation Derating and increased heat Severe derating, shut down and/or damage

10 VRp vs. Other AVRs Servo-motor based or tap-switching AVRs are not suitable for sensitive load equipment such as power supplies, rectitifers using solid-state devices and air-conditioners, because of their slow response time and inherent performance limitations. VRp (PWM precision voltage regulators) can be used to protect any electronic equipment, particularly in countries with inadequate infrastructures for the generation and distribution of AC power. VRp is superior thanks to its fast response time, cycle-by-cycle voltage regulation without interrupting the load current, as well as other performance advantages discussed in the following presentation.

11 Degree of Protection VRp is designed to provide maximum protection for all types of electronic and electrical devices & systems; The level of protection is superior due to extremely wide operating input voltage range of 140 to 330 vac. Other AVRs are too slow to respond and operates over narrow input voltage range of 170~280 vac only (typical).

12 Reliability VRp has no moving parts; VRp has few PCBs; VRp has few interconnections. Servo AVRs require frequent brush replacement; tap-switching AVRs are quite complicated with too many parts and interconnections.

13 Auto Bypass Prevents unexpected shut down of mission-critical equipment; Output of VRp is between VAC (even when in bypass). Other AVRs have manual bypass, which results in unscheduled shutdown.

14 Regulation does not interrupt power path Prevents switching surge voltages; Permits operation with generators; Reduces risk of damage to load. Tap-switching AVRs interrupt power path.

15 20 ms Voltage Correction Time Eliminates voltage step changes; Ideal for all sensitive electronic devices; Reduces risk of damage to load. Other AVR technologies take 200~ 5000 ms (0.2~5 seconds) before correction is made

16 +/-2 % Output Voltage Stability Superior protection for air-conditioners; Ideal for all sensitive electronic devices; Minimized step voltage changes. Tap-changer AVR s typically provide only +/- 5% to +/-10% output voltage stability

17 Soft Start Reduces inrush current to a minimum when mains cycle off/on; Ideal shock absorber; Enhances systems reliability; Ideal for air-conditioners, rectifiers and all sensitive electronic equipment Other technologies use random start via electromechanical contactor or relays

18 Stability Works well even with inferior or soft (high-impedance) mains AC source; Predictable performance; Ideal for air-conditioners, rectifiers and all types of sensitive electronic devices Other technologies may have trouble with demanding loads with soft mains AC source (high source impedance)

19 Overload Capacity Upto 500% (for 10 cycles or 200 ms) ; Ideal for starting air-conditioners, motors, rectifiers, switchmode supplies and others with high inrush currents; VRp does not have to be oversized. Some AVRs have difficulty with motors, air-conditioners and other loads with high start-up current requirements.

20 Load Compatibility VRp is compatible with all loads; Eliminates guessing and need for testing of AVR with load equipment before installation Tap-switcher AVRs are not compatible with inductive loads such as motors. Servo-motor based AVRs are not fast enough to protect electronic loads.

21 Additional Benefits of Outdoor VRp Reduces temperature inside container; Increases air conditioner lifetime; Enhances overall systems reliability; Extra space inside the container can be used for revenue generating equipment (and increase profitability for operators)