Input under voltage protection circuit

1. Overview (description of circuit type and realization of main function):
Input under voltage protection circuit. When the input voltage is lower than the preset under voltage value, cut off the output. When the input voltage rises to the preset recovery value, the output automatically returns to normal.
2. Circuit diagram:

A filter is a circuit that removes or “filters out” frequency components in a specific range. In other words, it separates the frequency spectrum of the signal into frequency components that will pass and frequency components that will be blocked.

Let us assume that we have an audio signal composed of a perfect 5 kHz sine wave. We know what a sine wave looks like in the time domain, and in the frequency domain we can only see a frequency “spike” of 5 kHz. Now let us suppose that we activate a 500 kHz oscillator to introduce high frequency noise into the audio signal. The signal seen on the oscilloscope is still just a sequence of voltages, with a value at each moment, but the signal will look different because its time domain changes must now reflect the 5 kHz sine wave and high-frequency noise fluctuations. However, in the frequency domain, sine waves and noise are separate frequency components that exist simultaneously in the one signal. Sine waves and noise occupy different parts of the signal’s frequency domain representation (as shown in the figure below), which means that we can filter out noise by directing the signal through circuits that pass low frequencies and block high frequencies.

ACSOON Power Inverter

A power inverter changes DC power from a battery into conventional AC power that you can use to operate all kinds of devices … electric equipment applications. You just connect the inverter to a battery, and connect your AC devices equipment into the inverter … and you’ve got pure sine wave power from the Inverter.

Acsoon® ANDW series power inverter, provides clean low-distortion sine wave
output at ideal powering sensitive electronics/instruments,electric equipments. It integrates IGBT made by combines microprocessor and PLC control design together for quick response and higher reliability. The input could be grid power AC 220Vac +/-15% single phase, 380Vac+/-15% three phase and battery DC 48V,60V,110V,220V or 520V etc.,For instance,when AC input power supply failed, the Inverter will automatically switch to your DC source. Of course, when DC input power supply failed , the unit will switch to BYPASS AC Input. It can be factory set for AC or DC primary input operation mode.

The inverter draws its power from a battery, or several batteries wired in parallel. The battery will need to be recharged as the power is drawn out of it by the inverter. The battery can be recharged by running the automobile motor, or a gas generator, solar panels, or wind. Or you can use a battery charger plugged into an AC outlet to recharge the battery.

Whatever a power converter or inverter is, customer should clearly understand what the electric device or equipment’s capacity is. For example, the electric device’s Horse Power is 3kW, we usually propose customer with a wide rage of converter or inverter such as 5kVA,  ACSOON provide wide range of capacity to customers for their electric devices.

Acsoon® ANDW series power supply single units are available with the
following capacities:
Single phase output: 500VA ~ 10KVA

Fault Finding Method of AF60W Series Frequency Converter / AC Power Supply

1.The buzzer alarm and the LED marked”GL/LED3″ is lighting up in the motherboard,it means over current alarm.

If there is no load units,the IGBT module and the Driven Circuit Board may be faulty,please check them as per instruction showing in Part D
If there load units,please cut off some loads.

2.The buzzer alarm and the LED which marked”GR/LED1″ is lighting up in the motherboard,it means over heat alarm.

Please check the exhaust fans,they may not work or its speed becomes slow.replace new ones or reduce some load units.

3. The buzzer alarm and the LED which marked”GY/LED2″ is lighting up in the motherboard,it means over voltage alarm.

Please check the output Filtering Capacitors showed in Part F,test it to see how many μF it is,if it’s about 0.3 μ F (almost zero)when it should be 30μ F,50 μ F… which is showed in the label.it tells they are faulty,please replace the new ones.

Note,please disconnect the capacitors from the unit before test it with meter.

1.The display shows output voltage is much lower than the setting voltage Please check the buffering circuit modules. If you can feel the heating come from the buffer resistance obviously or the resistance looks been burn it can tell the static switch is faulty.
2.If the panel display is not lighting up after press the“start”button, please check the “Power off/on Board”showed in Part E,please test to see if it’s +-DC17V or +- DC12V shown on the part E,if not,it tells this board is faulty.

How to know the mother board is faulty or not.

For the 3 phase unit, each phase is independent. The motherboard connected each phase driven circuit board with a single gray flat-cables,so there are 3 gray flat cables here Action:turn off the unit first ,then Please disconnect the 3 gray flat-cables from the mother board,now turn on the converter to see if the alarm is still there,if yes,it means the mother board is failed.If No,it means the mother board is good.

A typical power inverter device or circuit requires a relatively stable DC power source capable of supplying enough current for the intended power demands of the system. The input voltage depends on the design and purpose of the inverter. Examples include:
24, 36 and 48 V DC, which are common standards for home energy systems.
110V and 220VDC, which are common standards for Industrial or Commercial power systems
200 to 400 V DC, when power is from Photovoltaic solar panels.
300 to 500 V DC, when power is from electric vehicle battery packs in vehicle-to-grid systems.

Output

Voltage: Single phase 120V,Single phase 220V,
Three Phase 220V/380V, Three Phase 240V/415V, Three Phase 254V/440V,
Three Phase 277V/480V Fixed (select one individual voltage)
Frequency:50Hz or 60Hz or 400Hz

Voltage Regulation:+/-1%
Frequency Regulation:+/-0.01%
Distortion:THD<3%@ linear load

An aircraft ground power unit allows operators to provide 28VDC and/or 115VAC power to the aircraft while on the ground. These units are used to help start the aircraft’s engines, performing maintenance, repair, or provide general on board power while the aircraft is in the hangar or on the ramp.

The GPU is usually run on the ground during passenger boarding and deplaning. The GPU turns an electric generator that powers the electrical system on the aircraft when the main engines are off, more importantly thing is that it starting the main engines.

Fixed Electrical Ground Power
Fixed Electrical Ground Power Unit is the term given to solid-state AC frequency converters, providing 115V 400Hz of alternating current to power large commercial aircraft, via a specialized 6-pin plug.
The use of GPU in airports allows the aircraft engines and auxiliary power unit located in the tail to be switched off once the aircraft is on stand.  The huge fuel saving and positive environmental impact has been a deciding factor in the industry

Static Frequency Converters, sometimes also known as Fixed Frequency Converters, Static Frequency Converters (SFC) do not produce continuous three phase power. A rotary phase converter produces a true sine wave of 3 phase power and can run the machinery at full horsepower

Rotary frequency converters (also called Motor-Generators) convert incoming AC Power into rotary mechanical power (spinning motor), which transmits its rotary power to a generator, which converts its mechanical power into Electric AC output power. Rotary power is often described in terms of Horsepower, while Electrical power is described in Kilowatts (kW) or Kilovolt Amperes (KVA). The conversion of frequency (Hertz – Hz), voltage, and/or phase (3 phase, 1 phase) are inherent in this process.

ACSOON Static frequency converters are used to feed loads that require AC power at a fixed or variable frequency different from what is available from the Mains. Using an intermediate DC transformation, the device can deliver that power under the required conditions.

Project Reference:
Acsoon provided 8 units Static frequency converters to meet the NORINCO GROUP(China North Industries Group Corporation Limited) , for more details, please review ACSOON project cases on our website.

ACSOON ANDW48 series sine wave inverter, Input voltage is 48VDC, and the output is AC 220V AC. Mainly for power plants, power systems, chemical industry, and other important occasions to provide uninterrupted power. Compared with conventional uninterruptible Power Supply (UPS), inverter power supply has the following advantages in power plants

Install and operation

The upper terminals are:

“+”: positive pole of DC input, “-“: negative pole of DC input, pay attention to positive and negative pole and do not connect them reversely;

“L”: live line of bypass input, “n”: zero line of bypass input, “GND”: ground line of AC output;

“L”: live line of AC output, “n”: zero line of AC output, “GND”: ground line of AC output.

When unpacking, please check whether the box is damaged. If the box is obviously deformed, please immediately

Contact the supplier.

1. Confirm that the start switch on the front panel is in the “stop” position. The DC air switch on the back of the chassis is also in the “stop” position.

2. Please connect the DC line to the terminal correctly according to the input mark in the inverter, and do not connect “+” – “reversely!

3. Start up: first connect the DC input of the power supply, set the DC air switch at the back of the chassis to the “start” position, then set the start switch on the front panel of the power supply to the “start” position, and the “inverter” indicator light of the power supply will be on, indicating that the inverter works normally. The voltmeter and ammeter start to display the working status at this time.

4. Shutdown: set the start switch on the front panel of the power supply to the “stop” position, and then set the DC air switch behind the power supply to the “stop” position, and the power supply stops working

Simply frequency converter is a power conversion device. The frequency converter converts a basic frequency, voltage sine-wave power to a variable-frequency or variable-voltage.

Acsoon® AF60W series is ideal for export/import testing and operating equipment manufactured or used abroad. It can simulate grid conditions in any country in the world. Simply select the required frequency, choose a voltage range, tune the voltage to your desired value, which can be ready to test after that. Clean sine wave output with excellent line and load regulation, high efficiency and low harmonic distortion, in the industry’s most compact size

Acsoon Power’s AF60W series frequency converter/AC power source are designed to change conventional 50 Hz or 60 Hz electrical energy to virtually any other frequency. The frequency conversion is accomplished in a two (2)-stage process. The first stage converts the incoming alternating supply voltage to a controlled DC voltage (rectification). The second stage inverts the DC voltage to an alternating supply voltage at the desired output frequency (Inversion).

The principle block diagram of the AF60W Series IGBT pulse width modulation variable frequency power source.

Voltage and frequency fluctuations are common and quiet high in isolated area.The main function of a stabilizer is to make the output voltage and frequency that feeds the equipment connected to it as much as possible equivalent to the ideal electrical power supply. fluctuations of voltage and frequency damage to your electrical appliances like household Electric appliances, Oil equipment,Industrial equipment etc.,and affect your valuable equipment critically.

A carefully selected, right kind of AC Power Supply can get you out of this problem. ACSOON AF50W series voltage and frequency stabilizer prevents undesirable voltage &frequency fluctuations to enter into your electrical appliances, thus making its operations trouble free.  with an experience of more than 14 years in the industry, offers a stable voltage and frequency value to meet various application demands for your requirements in high voltage and frequency regulation of +/-0.1. ACSOON AF50 series voltage&frequency stabilizer are designed and manufactured with latest technology and quality electric components to safeguard all types of your electrical appliances from voltage &frequency fluctuations.

Application
Power supply substation, Lab, Factories, Telecommunication, Medical, IT, Motor Manufacturer, Scientific Research, EMI/EMC/safety test,
QA/QC safety test, Electric machinery test,Superior power for laboratory,switching power test, AC fan test,transformer test,
compressor test,motor test,air conditioner test,copier equipment test,computer/scanner test,SCR test, electrical appliances

ACSOON Project Reference
Specifications: AF50 Series Voltage&Frequency Stabilizer
· Capacity: 1kVA-2000kVA
· Input:130V-280V,Single Phase/230V-490V,Three Phase
· Frequency:30-80Hz+/-5%
· Output: 380V/220V+/-1%,or as your specific requirement
· Frequency:50/60Hz(50Hz+/-0.01%)

The railway Power Inverter (110V DC input) is a kind of intelligent power inverter, working principle driven by DC to AC inverter technology, ACSOON AC power supply developed with new digital technology to meet the high reliability requirements of power plants and substations.

The system adopts SPWM & PWM technology, IGBT power module and output isolation transformer, so that the output of the power could invert a pure sine wave power supply with stable frequency and voltage, noise filtering, without interference from power grid fluctuation, low distortion, strong load capacity, good load compatibility, wide DC input voltage range, etc., which greatly meets the needs of various electrical environments;

The perfect protection device improves the stability and reliability of the system operation, such humanized interface design. The communication between AC power supply and PC can be thoroughly carried out through RS232 communication interface, so that the user can easily observe the working condition, historical record and control the power inverter at any time on the terminal. At the same time, the remote network monitoring function can be used to monitor and manage the inverter at any time and at any time through the network, so as to truly achieve the unattended function, and can be composed backup system to improve system reliability, with the design concept of stability above all else, the ACSOON AND110 series inverter is the best choice of your power supply system.