Introduction

In modern electronic systems, diodes—key components for rectification, freewheeling, and isolation—are widely used in fields such as power management, solar energy systems, and UPS (Uninterruptible Power Supply) systems. However, traditional silicon diodes have a forward voltage drop of approximately 0.7V, which causes significant power loss in high-current applications and compromises system efficiency. The ideal diode controller is precisely an innovative solution to address this issue, and MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) serve as the core components for implementing this technology.

Working Principle of the Ideal Diode Controller

The basic principle of an ideal diode controller is to utilize the low on-resistance characteristic of MOSFETs to simulate the unidirectional conduction function of diodes, while minimizing conduction loss to the greatest extent. When the source voltage of the MOSFET is higher than the drain voltage, the controller detects the forward-biased state and immediately turns on the MOSFET. Leveraging the MOSFET’s extremely low on-resistance, current flows through it, resulting in a voltage drop far lower than that of traditional diodes. When a reverse-biased state is detected, the controller quickly turns off the MOSFET to block the flow of reverse current, thereby achieving the reverse cutoff function of a diode.

The key to this design lies in accurate voltage detection and fast switching control. The controller needs to monitor voltage changes across the MOSFET in real time and complete turn-on and turn-off operations within microseconds, ensuring reliable simulation of diode characteristics under all operating conditions. Meanwhile, to address the freewheeling issue at the moment the MOSFET turns off, a low-power Schottky diode is usually integrated into the controller as an auxiliary component to provide an initial current path.

Key Requirements for MOSFETs in Ideal Diode Controllers

To implement a high-performance ideal diode controller, strict requirements are imposed on the selection of MOSFETs:

• Ultra-low on-resistance: As the most critical parameter, it directly determines the magnitude of conduction loss. Ideally, the on-resistance should be as small as possible to achieve near-zero voltage drop during conduction.
• Fast switching speed: MOSFETs must have the capability for rapid turn-on and turn-off to ensure timely response when voltage polarity changes, preventing the generation of reverse current.
• Low gate charge: Smaller gate charge helps improve switching speed, reduce drive loss, and enhance overall system efficiency.
• Appropriate voltage rating: The voltage rating should be selected based on the voltage level of the application circuit to ensure safe operation under all working conditions.
• Excellent temperature characteristics: The temperature coefficient of on-resistance should be small, ensuring stable performance across different temperature environments.
• Compact packaging: Suitable for high-density PCB design, especially in space-constrained applications.

Application Value and System Advantages of Heketai MOSFETs

As a professional manufacturer of power semiconductor devices, Heketai Electronics offers an outstanding product series of MOSFETs for ideal diode controllers. Taking the HKTG48N10 (an N-channel MOSFET) as an example, it boasts prominent advantages such as an on-resistance of 8 mΩ, ultra-low voltage drop, excellent switching characteristics, and strong compatibility. The ideal diode controller made with Heketai MOSFETs delivers significant advantages over traditional diode solutions:

• Substantial efficiency improvement: Conduction loss is reduced by 80-90%, and the overall system efficiency is increased by 2-5 percentage points—making it particularly suitable for application scenarios with strict efficiency requirements.
• Significant temperature rise reduction: The low-power characteristic greatly lowers system temperature rise, improving reliability and service life.
• Comprehensive protection functions: Integrated with overcurrent, overvoltage, and overtemperature protection, enhancing system safety.

Conclusion

As a key technology for improving the efficiency of electronic systems, ideal diode controllers are being applied in an increasing number of fields. Heketai MOSFETs, with their outstanding electrical characteristics and reliable quality, provide an ideal solution for the implementation of this technology. Whether in power management, solar inverters, UPS systems, or motor drives, Heketai MOSFETs can offer engineers high-performance and high-reliability options, helping to build more efficient and reliable electronic systems. Let us work together to drive the development of the electronic industry with innovative technologies and contribute to a green and energy-efficient future.

Company Introduction

Founded in 1992, Heketai is a high-tech and "Specialized, Refined, Differential, and Innovative" enterprise integrating R&D, design, production, and sales of professional components. It focuses on providing cost-effective component supply and customized services to meet the R&D needs of enterprises.

• Product Supply Categories: Covers semiconductor packaging materials, passive components such as resistors/capacitors/inductors; as well as MOSFETs, TVS diodes, Schottky diodes, Zener diodes, fast recovery diodes, bridge rectifiers, diodes, triodes, power devices, power management ICs, and more, providing one-stop procurement for R&D and production requirements.
• Two Intelligent Manufacturing Centers: The South China and Southwest manufacturing centers (Huizhou: 75,000 m² + Nanchong: 35,000 m²) are equipped with over 3,000 sets of advanced equipment and testing instruments. In 2024, 3 new semiconductor material subsidiaries were added to control production capacity and delivery efficiency from the source.
• Packaging and Testing OEM Services: Supports sample customization and small-batch trial production. Combined with over 100 patented technologies and certification systems including ISO9001 and IATF16949, it ensures that "quality first" runs through every link from R&D to delivery.

Adhering to the core values of "customer-oriented and innovation-driven", Heketai has always provided stable and reliable components for enterprises.

(Note: Sample Application / Solution Consultation / Small-Batch Procurement ↓)

Contact Heketai via QR Code Scan

• Sales Hotline: 18823438533 (WeChat ID is the same as this number)
• Company Tel: 0755-82565333
• Email: hkt@heketai.com
• Marketing Center: 8th Floor, Building 7, Kangli Cheng, Longgang District, Shenzhen City, Guangdong Province
• Manufacturing Centers:

1. 183B, Puxinhu Commercial Street, Tangxia Town, Dongguan City
2. Buildings 17 & 18, Science and Technology Innovation Center, High-Tech Zone, Nanchong City, Sichuan Province

Translation Notes:

1. Place Names: Follow official Pinyin transliteration standards for Chinese administrative divisions (e.g., "龙岗区" → "Longgang District", "塘厦镇" → "Tangxia Town") and retain proper nouns like "康利城" (Kangli Cheng) to ensure accuracy for international communication.
2. Contact Format: Phone numbers keep the original sequence (with area code "0755-" for Shenzhen landline) and clarify the connection between the sales hotline and WeChat with "WeChat ID is the same as this number", avoiding ambiguity.
3. Readability: Use bullet points and line breaks to categorize contact information (hotline, email, addresses), aligning with the common layout of English contact pages for clear navigation.