Dual-pulse power supply: Basic principles and functions of pulse power supplies
Dual Pulse Power Supply What is a pulse power supply? A customer's load requires intermittent power, that is, according to a certain time pattern, the load is energized for a certain period of time, and then the power is turned off for a certain period of time, and one conduction cycle is generated. This is continuously executed to form a pulse power supply.
Puli recommends the principle and function of the pulse power supply:
For example, in the mature processing technology of non-optically active electrolytic capacitors, the capacitor needs to be charged in the forward direction for a period of time, then charged and discharged, then charged in the reverse direction for a period of time, then charged and discharged, so that forward → charge and discharge (power off) → reverse → charge and discharge → forward… This is repeated continuously.
Pulse power supplies can be divided into single-pulse power supplies and dual-pulse power supplies.
1. Single-pulse power supply
Pulse plating power supply. Single-pulse power supplies generally output fixed unilateral surge current parameters. If you want to change the single-pulse parameters, you need to turn off the power and reset it.
2. Dual-pulse power supply
Dual-pulse power supplies generally output periodically switched surge current parameters. If you want to change the single-pulse parameters, you need to turn off the power and reset it. The reverse single pulse anodizing dissolution of the dual-pulse power supply allows the metal ion concentration on the cathode surface to recover quickly, which is beneficial for the subsequent cathode cycle to use a high surge current density, so the coating is dense, bright, and has low porosity;
The reverse single pulse anodizing stripping of the dual-pulse power supply greatly reduces the adhesion of chemical residues (including polishing liquid) in the coating, so the coating has high purity and strong anti-fading ability. YS-9000 Wing-lift type intelligent single-pulse plating power supply provides a powerful method for the research and development and production of nanotechnology plating technology.
Principle of Pulse Power Supply Technology
In the single-pulse plating process, when the current is switched on and off, the single-pulse (peak) current is several or even dozens of times that of ordinary DC current. It is this instantaneous high current intensity that causes the metal ions to be reduced under very high overpotential, thereby narrowing the deposited crystals; when the current is turned off, the charged and discharged ions around the cathode area are restored to their original concentration, the concentration polarization is eliminated, which is conducive to the next single-pulse period to use a high single-pulse (peak) current intensity again, and the shutdown period is also accompanied by beneficial recrystallization, adsorption and desorption, etc., for the deposit.
This process periodically surrounds the whole cause and effect of the entire plating process, and the principles involved constitute the most basic concept of single-pulse plating. Experience shows that pulse power supplies have incomparable advantages over traditional DC plating in optimizing crystals, improving coating physical properties, and saving precious metals.
First, slow energy storage technology is used to make the primary energy have sufficient energy; then, the intermediate energy storage and single-pulse forming system are charged (or injected with energy). After the energy goes through some complex processes such as storage, reduction, single-pulse generation, or conversion, it is finally quickly charged and discharged to the load.
Functions of Pulse Power Supply Technology
① Increase the single-pulse repetition frequency: By increasing the repetition frequency of the single pulse, not only the average power of the pulse power supply is increased, but also the volume of the power supply is reduced and the cost is reduced.
② Improve power efficiency and reduce power consumption.
③ Improve the reliability of the power supply system: Single-pulse charge and discharge heat generation and high-frequency interference signals have a serious impact on reliability indicators.
Pulse power supplies are superior to traditional plating power supplies and represent the future of plating power supplies.
When pulse power supplies are used for plating gold, silver, nickel, tin, and aluminum alloys, the multi-functionality of the coating can be greatly improved; when used for protective-decorative plating (such as decorative gold), the coating color can be uniform and consistent, with good chroma and strong corrosion resistance; when used for precious metal purification, the purity of precious metals is higher.
Dual-pulse power supply plating is more delicate and smoother than single-pulse power supply plating. The reverse single-pulse anodizing dissolution of the dual-pulse power supply allows the metal ion concentration on the cathode surface to recover quickly, which is beneficial for the subsequent cathode cycle to use a high surge current density, so the coating is dense, bright, and has low porosity; the reverse single-pulse anodizing stripping of the dual-pulse power supply greatly reduces the adhesion of chemical residues (including polishing liquid) in the coating, so the coating has high purity and strong anti-fading ability.
Dual-pulse power supplies are suitable for plating gold, silver, non-ferrous metals, nickel, zinc, tin, chromium, and aluminum alloys; electroforming copper and nickel; energizing electrolytic capacitors; anodizing aluminum and titanium products; and electropolishing high-precision parts.
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