The Core Technologies Of High-capacity Switching Power Supply Design And The Important Role Of Electrical Bimetal Contact Rivets

With the continuous upgrading of communication and power industry equipment, the market is placing higher demands on the power rating, operational stability, and parallel expansion capabilities of high-capacity DC switching power supplies. Traditional parallel solutions for small-power modules generally suffer from poor current sharing accuracy, high harmonic interference, and insufficient system stability, making them unsuitable for high-power industrial scenarios. Therefore, optimizing the power supply topology and overcoming challenges in power correction, stable control, and parallel current sharing have become core priorities in the design of high-capacity switching power supplies. The signal switching components in the power supply control circuit often employ Composite Contact Rivets for Relay, which, with their excellent switching stability, ensure accurate and error-free control signal transmission.

Standardized high-capacity switching power supplies mainly consist of two modules: the main power circuit and the intelligent control circuit. High-end models are equipped with a PIC microcontroller to build a numerical control system, enabling real-time parameter monitoring, fault warning, and remote control. The main circuit often adopts an H-bridge inverter topology. To simplify manufacturing processes and reduce equipment costs, industrial design often uses mature hard-switching technology, effectively balancing switching losses and operating efficiency by precisely matching the switching frequency and power device models. The high-frequency operating contacts inside the equipment preferably use Silver Cadmium Electrical Contact, which is arc-resistant, fatigue-resistant, and suitable for high-frequency start-stop operation.

Low power factor and severe harmonic interference are common defects in traditional high-capacity power supplies, and three-phase single-switch PFC power factor correction technology is the core means to solve this problem. Industrial high-capacity power supplies are mostly compatible with 380V three-phase AC input lines. By adding PFC circuits to the input side of each module, even with input voltage fluctuations of ±20%, the DC bus voltage can still be stably maintained at 670VDC. This not only significantly improves the overall power factor and suppresses harmonics but also reduces the size of the downstream inverter transformer. The core control chip of this correction circuit is the UC1854, paired with a single-inductor structure, resulting in a simple structure and excellent correction effect. It features Silver Cadmium Oxide Agcdo Electrical Contact, which is high-temperature resistant, low-loss, and suitable for high-voltage rectification conditions.

System instability and false current feedback triggering are key pain points in hard-switching power supply design. Most current-type PWM controllers are prone to false turn-off of switching devices due to leading-edge glitches in the current waveform, leading to power supply output oscillations and abnormal operation. The mainstream industry optimization solution uses ramp compensation technology, which completely eliminates waveform glitches by connecting capacitors in parallel across the current transformer and adding an RC filter structure at the control port. Simultaneously, a dual closed-loop control strategy with inner and outer loops is adopted to precisely adjust the output voltage and current, significantly improving the dynamic and static performance of the power supply. The core components of the control module utilize Agcdo Bimetal Silver Rivet Contacts, which are highly responsive and adaptable to high-precision closed-loop control requirements.

Multi-module parallel current sharing technology is the core support for expanding the capacity of power supplies. Uneven current sharing can lead to module load imbalance, localized overheating, and a sharp reduction in equipment lifespan. The current mainstream industry-standard independent current sharing solution relies on the UC3902 dedicated current sharing chip. Utilizing bus voltage feedback and the unidirectional conduction characteristics of diodes, it automatically identifies the master module with the largest load, while the remaining slave modules track the reference current in real time, dynamically adjusting the PWM duty cycle to ultimately achieve current balance across all parallel modules. The design requires configuring a resistor-capacitor buffer structure on the chip pins to avoid system oscillations caused by conflicting adjustment rhythms. The parallel switching contacts use Silver Copper Composite Rivet Contacts, ensuring uniform conductivity and effectively reducing current sharing errors.

Proper component selection and process optimization are fundamental to ensuring long-term stable operation of the power supply. Under high-frequency switching and dynamic adjustment conditions, the internal contacts of the power supply are prone to problems such as ablation, oxidation, and increased contact resistance, directly affecting current sharing accuracy and output stability. Selecting contact components suitable for high-power operating conditions is crucial. Silver Cadmium Oxide Bimetallic Contact Rivets offer advantages such as arc resistance, oxidation resistance, and wear resistance, perfectly adapting to the high-frequency dynamic adjustment characteristics of high-capacity power supplies.

To verify the feasibility and stability of the entire design scheme, the industry conducted specialized performance tests on multiple high-power power supply prototypes. Test results show that the optimized power supply achieves a voltage regulation accuracy of 0.1%, a current regulation accuracy of 0.08%, a load jump dynamic response of only 150μs, a maximum overall efficiency of 91%, and the current unevenness of multiple parallel modules is strictly controlled within ±3%. All indicators meet high-end industrial standards. This excellent performance relies on the stable support of precision contacts. Contact Electrical Bi-metal Contact Rivets can adapt to current fluctuations, ensuring switching stability under all operating conditions.