An inverter overcurrent protection circuit
By designing an inverter overcurrent protection circuit and utilizing a voltage comparator and a voltage adjustable circuit, real-time overcurrent protection for the inverter was achieved, solving the problem of inverter shutdown or failure caused by a rapid increase in DC terminal voltage, and improving the reliability and safety of the inverter.
CN224289271UActive Publication Date: 2026-05-26SHENZHEN GROWATT NEW ENERGY TECH CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN GROWATT NEW ENERGY TECH CO LTD
- Filing Date
- 2026-04-08
- Publication Date
- 2026-05-26
AI Technical Summary
Technical Problem
Existing inverters lack effective overcurrent protection when the DC voltage increases rapidly, which can lead to inverter shutdown or explosion, and even endanger personal safety.
Method used
An inverter overcurrent protection circuit was designed, including a voltage comparator and a voltage adjustable circuit. Real-time protection of the inverter is achieved by comparing the voltage sampled by the inductor current with the adjustable voltage signal.
Benefits of technology
It enables rapid protection against different DC bus voltages, avoids inverter failures, and improves the reliability and safety of the inverter.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN224289271U_ABST
Abstract
This invention provides an inverter overcurrent protection circuit, including a voltage comparator and a voltage adjustable circuit. The negative input terminal of the voltage comparator is connected to an inductor current sampling voltage. The input terminal of the voltage adjustable circuit is connected to an adjustable voltage signal, and the positive output terminal of the voltage adjustable circuit is connected to the positive input terminal of the voltage comparator. The output terminal of the voltage comparator outputs an overcurrent protection signal. The inductor is the output inductor of the inverter, and the inductor current sampling voltage is the voltage obtained by sampling and converting the current flowing through the inductor. The voltage comparator is a comparator or an operational amplifier. When the voltage comparator is a comparator, one end of the comparator's output terminal is connected to a pull-up resistor, and the other end of the pull-up resistor is connected to a pull-up power supply. This inverter overcurrent protection circuit can quickly achieve inverter overcurrent protection, protecting the inverter from damage and improving product reliability.
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