Voltage boosting type DC-DC super-low-voltage cold start circuit

Abstract

The invention specifically relates to a voltage boosting type DC-DC super-low-voltage cold start circuit, and aims to provide the voltage boosting type DC-DC super-low-voltage cold start circuit withan overvoltage protection function for solving the technical problems. According to an adopted technical scheme, the voltage boosting type DC-DC super-low-voltage cold start circuit comprises a cold start circuit, an off-chip inductor L1, a cold start power tube Q1, a BOOST power tube Q2, a shared rectifier tube Q3, a PFM driving chip, an off-chip capacitor C1 and an output voltage detection circuit. The super-low-voltage cold start circuit can be started at a super low voltage, and can be protected from damage in a high voltage condition, thereby satisfying a wide energy collection source voltage range, and realizing wide application, and is applicable to the field of electric power.

Description

technical field [0001] The invention belongs to the technical field of cold start circuits, and in particular relates to a step-up DC-DC ultra-low voltage cold start circuit. Background technique [0002] As a very important energy harvesting circuit, the BOOST DC-DC booster circuit is usually used for energy harvesting of photovoltaic cells or thermal cells. This circuit needs to use the cold start circuit to pull up the voltage, so that it enters the normal energy harvesting mode. However, the cold start circuit with the traditional structure has a relatively high starting voltage, mostly above 0.5V, and will limit the input range of the energy harvesting source voltage, and does not have an overvoltage protection mechanism with a wide input range. In practical applications, the voltage of a single solar cell is between 0.4V and 0.7V, and cold start needs to be completed at an ultra-low voltage, while the voltage of a thermal energy battery can reach more than 2V. The st...

AI Technical Summary

Problems solved by technology

However, the cold start circuit with the traditional structure has a relatively high starting voltage, mostly above 0.5V, and will limit the input range of the energy harvesting source voltage, and does not have an overvoltage protection mechanism with a wide input range.

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