Rectifier in South Africa

Our company 1000A rectifier power supply working well in South Africa customer’s plating machine workshop.

Specification:

Input voltage: 3 Phase, 50Hz, 380V

Output current: 0-1000A adjustable

Output voltage: 0-12V.

The plating power supply working well, South Africa customer is satisfied with our rectifier, and says will purchase more and more.

Plating rectifier

Plating rectifier South Africa

Electroplating rectifier

Electroplating rectifier

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Electroplating rectifier greenization:

Electroplating rectifier system greenization have profound meaning:
The first is significant energy-saving, which means save power generation capacity, while power generation is an important cause of environmental pollution, so power saving can reduce environmental pollution; and secondly these power can not (or less) generates pollution to power grid, International Electrotechnical Commission (IEC) has developed a series of standards such as IEC555, IEC917, IECl000. In fact, many power electronic energy-saving equipment, often turn into sources of pollution on the grid: inject to grid of serious harmonic current, make the total power factor drops, so many glitches coupling grid voltage spikes and peaks, even chipping and distortion. In end of 20th century, a variety of active filter and active compensator was born, with a variety of power factor correction method. Laid the foundation for mass production of a variety of green switching power supply in 21 century.

Modern power electronics technology is the basis for development of electroplating rectifier:

Modern power electronics is the basis for development of electroplating rectifier technology. With the continuous emergence of new power electronic devices and adapted to more higher switching frequency circuit topology, modern power supply technology driven by real needs will be rapid developped. In traditional application technique, due to the performance limits of power leaving, switching power supply device performance is affected. Greatly put to good use of characteristics of various power devices, minimize device performance impact on switching mode rectifier, new power circuit topology and new control technology enables power switching at zero voltage or zero current state, which can greatly increase the operating frequency, improve work efficiency of switching mode power supply, then design excellent performance switch mode power supply.

More electroplating rectifier waiting to be developed:

In short, power electronics and switching electroplating rectifier technology continues to move forward due to application requirements, the emergence of new technologies will make many applications replacement products, but also to open up more and new applications. High frequency rectifier switching power supply, modular, digital, greenization etc., will mark these technologies as mature, to realize high efficiency and high-quality electricity application combined. In recent years, with the development of the communications industry, switch power technology as the core of communications switching power supply, only the domestic market demand of more than 20 billion yuan, has attracted a large number of scientific and technical personnel to develop research. Switching power supply instead of linear power and phase control power supply is the trend and will soon be developed. There are many other in switching power supply technology as the core of a dedicated power supply, industrial power are waiting for people to develop.

Electroplating rectifier

Electroplating rectifier

IGBT rectifier

IGBT rectifier

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Briefly of IGBT rectifier:

Through comprehensive analysis of the equivalent circuit to simplify explain cumbersome IGBT working principle and the role, and noted IGBT characteristics. It can be said, IGBT is a switching device either on or off, it combine both advantages of of MOSFET’s high input impedance and GTR’s low conduction voltage drop.

IGBT Rectifier constitution:

IGBT (insulated gate bipolar transistor), constituted of BJT (bipolar transistor) and MOS (insulated gate field effect transistor) composite full-controlled type voltage-driven power semiconductor devices, with high input impedance MOSFET and GTR’s low on-state voltage drop down. GTR saturation pressure drop, carrier high current density, but the drive current is large; MOSFET drive power is very small, fast switching speed, but large conducting voltage drop, the carrier density is small.
IGBT combines advantages of these two devices, the driving power is small and the saturation while voltage drop low. Very suitable for the DC voltage of 600V and above, variable flow systems such as AC motor, inverter, switching power supply, lighting circuits, traction drive and other fields.
Insulated gate bipolar transistor (IGBT) is the youngest one of high voltage switch family. A 15V high-impedance voltage source facilitate control current flow through the device which can achieve a lower control power to control the high current.

IGBT rectifier principle and action:

Simply to say, IGBT is a switch, either on or off, how to control its on or off, by the gate-source voltage, when the gate-source plus +12V (greater than 6V, generally take 12V to 15V) the IGBT conducting, gate source voltage is not applied or is applied negative pressure, IGBT turn-off, a negative pressure purpose is reliably shut off. No amplified voltage IGBT function, turn on can be seen as the wire, other as open circuit when disconnected.

IGBT rectifier conduct/insulation electricity:

IGBT has three terminals, namely, G, D, S, G and S ends apply voltage, the internal electrons transfer (characteristic of the semiconductor material, which is the reason why use semiconductor material as power electronic switch), originally correspondence of positive and negative ions, semiconductor material in neutral, but applied voltage, electrons under the influence of voltage, accumulation to one side, forming a layer of conductive channel, because the electron is electrically conductive, becomes a conductor . If remove applied both ends voltage of GS, this layer of conductive channel disappear, do not conduct electricity, and become insulators. This is pass of IGBT rectifier.

IGBT rectifier

Electrophoresis power source

Electrophoresis power source

Electrophoresis power source selection:

Electrophoresis power source is a key equipment for electrophoresis coating machinery, so appropriate selection of electrophoresis power source capacity, can significantly improve the cost efficiency ratio of electrophoretic coating equipment. So in the design of electrophoretic coating machine, electrophoresis power source choice is particularly important. Here is a brief description of electrophoresis power supply selection, hope you can have right choice for electrophoresis rectifier.

Electrophoretic coating is to make the to be coated (workpiece) immersed in an aqueous coating as one electrode (anode or cathode), set up another corresponding electrode (cathode or anode), between the two poles applied a DC electric field, by physical and chemical effects generated by electric field, make the coating particle coated on the workpieces surface uniformly. This is an advanced, modern new painting technologies.

Electrophoresis power source is core for electrophoretic coating equipment:

Based electrophoretic painting working principle, electrophoresis power source is DC power supply, is a key equipment for electrophoretic coating equipment, there is no electrophoresis if there is no DC power supply. If select DC power supply capacity properly, can significantly improve the cost effect. If choose a large electrophoresis power supply capacity, will increase the production cost of equipment, so as to improve equipment installation power, resulting in waste. On the contrary, it makes the entire production line not fully utilized, productivity can not be improved. If need large on-line coating, electrophoresis current is too large, resulting in a DC power supply over current protection, can not be normal production. So in the design work of the electrophoretic coating equipment, electrophoresis power source choice is particularly important.

Electrophoresis power source election based on:

Key features and specifications of the electrophoresis power source need to fully meet the electrophoretic coating process requirements. Based on the following aspects:

1) Inherent characteristics of electrophoretic paint;

a, Electrophoretic paint “breakdown voltage”;
b, Electrophoretic paint “threshold voltage”;
c, Electrophoretic paint, “Coulomb efficiency.”

2) To be coated workpiece surface area (internal and external surface area);
3) Complexity of the workpiece and shape of the workpiece.
Electrophoresis power supply

Electrophoresis power supply

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Electrophoresis power source

Electrophoresis power source

12v dc power supply

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12v dc power supply Category:

12v dc power supply switching power supply circuit structure of variety configuration:

(1) By driving points, there are self-excited and separately-excited type.
(2) According to the working mode DC/DC converter points:
① Single-end excitation and reverse, push-pull, half-bridge, full-bridge, etc;
② Reduce voltage, increase voltage and reduce/increase voltage type.
(3) Based on the circuit points, there are resonant and non-resonant.

(4) 12v dc power supply control points:

① Pulse width modulation (PWM) type;
② Pulse frequency modulation (PFM) formula;
③ 12v dc power supply PWM and PFM mixed type.
(5) According to power supply whether isolated and feedback control signal coupling points, there are isolated, non-isolated and transformer-coupled, optical coupling type and so on.
The above combination may constitute a variety of ways of 12v dc power supply switching mode power supply. So designers need a variety of ways according to the characteristics combined to produce meet the needs of high-quality switching mode power supply.

12v dc power supply control method:

Based on TRC control theory, there are three ways:
A, Pulse width modulation (Pulse Width Modulation, abbreviated as PWM) Switching period constant, by changing pulse width to change the duty cycle.
B, Pulse frequency modulation (abbreviated as PFM) Conduction pulse width constantly, by varying the switching working frequency to change the duty cycle.
C, Combined modulation Conduction pulse width and switching working frequency are not fixed, each can be changed, it is more than two ways of mixing. High-frequency switching power supply does not need to greatly improve the switching speed can be theoretically reduced to zero switching losses, also the noise is small.

12v dc power supply

12v dc power supply