I. Basic Definition of Dual Pulse Power Supply
A dual pulse power supply is a power conversion device capable of outputting two or more independently controllable electrical pulses, which distinguishes it from single pulse power supplies that can only generate a single pulse waveform. It can separately regulate core parameters of the two groups of pulses, including current, voltage, frequency, duty cycle and delay, to form diverse energy output waveforms. Thanks to its flexible and adjustable power supply characteristics, it boasts irreplaceable advantages over single pulse power supplies in electrochemistry, precision machining, material surface treatment and other fields.
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II. Core Working Principle of Dual Pulse Power Supply
(1) Overall Circuit Structure
The complete equipment mainly consists of five parts: rectification and filtering unit, two independent IGBT pulse inverter modules, digital control unit, output voltage and current regulation unit, as well as sampling feedback protection system. After being rectified at the front end, mains power is converted into stable DC bus voltage, which is then shunted to two mutually independent pulse generating circuits. The digital controller performs independent timing control on the two circuits respectively, and finally outputs two groups of pulse electric energy with non-interfering parameters.
(2) Control Logic of Dual Pulse Waveforms
The equipment outputs two groups of pulses. The mainstream industrial configuration is a combination of forward working pulse and reverse leveling pulse, which are output alternately in time sequence without simultaneous conduction:
- Forward Deposition Pulse: It outputs high current in a short duration and acts on workpieces to rapidly complete metal electrodeposition and material electroplating while guaranteeing processing efficiency. Its peak current, conduction time and pulse frequency can be adjusted separately.
- Reverse Stripping Pulse: It delivers low reverse current for an even shorter time and is inserted in the intervals of forward pulses. The reverse current dissolves burrs protruding on workpiece surfaces, levels electroplated crystal layers, refines metal grains, and eliminates coating defects such as pinholes, pitting and burning.
The digital chip controls the interval time and switching cycle of the two pulses through high-precision timing circuits. Meanwhile, it collects real-time current and voltage signals at the output terminal and feeds them back to the control end to dynamically modify pulse parameters, realizing stable constant current / constant voltage output. In case of overload, overvoltage or overheating, the protection module will immediately cut off pulse output to ensure the safety of equipment and workpieces.
(3) Core Advantages Compared with Single Pulse Power Supply
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III. Main Applications of Dual Pulse Power Supply
1. Precision Electroplating Industry (Core Application Scenario)
It is applicable to high-end electroplating processes including gold plating, silver plating, nickel plating, copper plating, chromium plating and alloy plating:
- Electroplating of electronic components: Gold and silver plating for chip pins, PCB circuit boards and connector terminals. Dual pulses can form dense, uniform coatings with low porosity, improving electrical conductivity and corrosion resistance.
- Electroplating of precision hardware parts: Jewelry, bathroom fittings and small aerospace components. Reverse pulses level workpiece surfaces to eliminate follow-up polishing and greatly reduce defective rates.
- Compatible with barrel plating and rack plating: For mass barrel plating of small parts, adjusting reverse pulse current can solve uneven current distribution problems such as excessively thick coatings at workpiece edges and thin coatings at central areas.
2. Anodizing and Electrolytic Polishing
In hard anodizing of aluminum alloys and electrolytic polishing of stainless steel, alternating power supply of dual pulses ensures uniform oxide film thickness, prevents local breakdown of oxide layers, and enhances oxide film hardness and color consistency. During electrolytic polishing, reverse pulses strip surface oxide layers to deliver superior mirror finish of workpieces.
3. Electroforming
Widely used in electroforming of molds, ultra-thin metal foils and logo nameplates. Forward pulses realize rapid metal deposition while reverse pulses refine grains. The formed metal parts feature low internal stress and high deformation resistance; ultra-thin foils are crack-free with minimal thickness deviation.
4. Electrolytic Purification of Metals and Electrolytic Treatment of Wastewater
For electrolytic purification of non-ferrous metals, dual pulses regulate deposition rate to upgrade metal purity. In electrolytic treatment of industrial electroplating wastewater, alternating pulses boost redox efficiency and rapidly decompose heavy metal ions and organic pollutants in water.
5. Special Pulse Machining
Dual pulse power supplies are widely adopted in laboratory research equipment for pulse electrolytic drilling, pulse etching and electrodeposition experiments of micro-nano materials. Users can freely match waveform parameters to satisfy variable process conditions for new material research and development.
IV. Summary of Industrial Application Value
Against the trend of high precision, high quality and low loss in surface treatment, dual pulse power supplies leverage the core feature of independent regulation of two groups of pulses to tackle pain points of traditional single pulse processes, including rough coatings, poor uniformity and low yield. Whether for large-scale industrial electroplating production or laboratory electrochemical research on new materials, dual pulse power supplies can optimize processes via flexible energy output modes. They shorten processing time and cut raw material consumption while improving product quality, making them indispensable core power supply equipment for electrochemical processing.