Rectifier Using MOSFET Switching Circuits to Reduce Manufacturing Costs
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Solution Overview
Problem
Traditional bridge rectifiers implemented with diodes require high-performance diodes to handle peak inverse voltage, leading to increased manufacturing costs.
Innovation Solution
A rectifier architecture using switching circuits with N-type Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) and driving circuits with Bipolar Junction Transistors (BJTs) to control switching status, replacing diodes with transistors and utilizing bootstrap circuits to manage voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional diode-based bridge rectifier is used, then the structure is simple and transformer size is small, but the peak inverse voltage requirement increases manufacturing cost
Solution Approach 1:
The patent changes the operating parameters of the rectifier by using transistors instead of diodes, allowing the use of lower voltage-rated components while achieving the same rectification function. The transistor's controlled switching capability enables operation at lower peak inverse voltages, directly reducing manufacturing costs.
Solution Approach 2:
The patent replaces the passive diode-based rectification mechanism with an active transistor-based switching system. This substitution enables controlled rectification where transistors are driven by auxiliary circuits to achieve the same full-wave rectification function but with reduced voltage stress on individual components.
2Reliability
If high-performance diodes with high peak inverse voltage are used, then rectification reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent fundamentally changes the voltage stress parameters by using transistors in a controlled switching configuration. The transistors experience lower peak inverse voltage compared to diodes in traditional rectifiers, allowing the use of lower-cost, lower-voltage-rated components while maintaining reliable rectification function.
Solution Approach 2:
The patent employs transistors that can be lower-voltage-rated and less expensive than high-performance diodes required for traditional rectifiers. The controlled switching operation extends the effective life of these lower-cost components by reducing voltage stress, making them more economical despite potentially shorter theoretical lifespan.
3Ease of manufacture
If transistors are used instead of diodes, then manufacturing cost is reduced, but circuit complexity increases
Solution Approach 1:
The patent merges the rectification function with the switching control function into an integrated circuit structure. The auxiliary winding, driving circuit, and transistor switching elements are combined to form a unified rectifier module, reducing the overall complexity compared to using separate high-voltage diodes with additional protection circuits.
Solution Approach 2:
The transistor-based switching element serves multiple functions: it acts as the rectification element, the switching element, and the controlled element all in one component. This multi-functionality reduces the total component count and simplifies the overall circuit architecture despite the more complex switching mechanism.
Data Source
AI summary
A rectifier, including: a first and a second input terminal, a first output terminal and at least one rectifying circuit. Each rectifying circuit including: a switching circuit including a transistor, and a driving circuit. The driving circuit is coupled to the switching circuit and controls a switching status of the switching circuit, and includes a totem-pole circuit and an input transistor. The totem-pole circuit includes an input terminal and an output terminal coupled to the transistor. The input transistor is coupled between the totem-pole circuit and the switching circuit. The at least one rectifying circuit includes a first and a second rectifying circuit. The transistors of the first rectifying circuit and the second rectifying circuit are coupled to the first output terminal. The input transistors of the first rectifying circuit and the second rectifying circuit are coupled to the first input terminal and the second input terminal, respectively.