Interior power supply circuit

Abstract

The present invention relates to an internal power supply circuit, which comprises an output stage circuit and a voltage stabilizing compensation circuit which is connected with the output stage circuit. The voltage stabilizing compensation circuit comprises two or more than two parallel zener serial units and diode serial tubes; wherein, the zener serial units are connected with the output stagecircuit; and the diode serial tubes are connected with the parallel zener serial units in series and are used for compensating the temperature. In the prior internal power supply circuit, the parasitic resistance and temperature coefficient of the zener tube are relatively high, as a result that when the voltage of the external power supply is changed within a large scale, the output voltage has relatively large changes. The present invention is provided with the voltage stabilizing compensation circuit which consists of the zener serial units and the diode serial units, so the influence of the parasitic resistance of the zener tube on the output voltage is reduced. Simultaneously, the temperature compensation is realized, and the dependency of the output voltage on the temperature is decreased.

Description

technical field [0001] The present invention relates to a power supply circuit, and more specifically relates to an internal power supply circuit which utilizes a zener voltage regulator tube to generate power in a high-voltage drive chip. Background technique [0002] With the rapid development of microelectronics technology, high-voltage power integrated circuits have been paid more and more attention as an important development direction. In the fields of automotive electronics and industrial control, high-voltage power integrated circuits play an important role. The development trend of high-voltage power integrated circuits is to integrate logic control circuits and power semiconductor tubes on the same chip, which improves the integration of chips. However, the logic control circuit inside the power circuit needs a power supply, and the components of the internal logic control circuit are ordinary devices without high-voltage resistance, and cannot directly work under...

AI Technical Summary

Problems solved by technology

However, an inherent defect of the Zener tube is that the parasitic resistance has a great influence on the breakdown voltage. Especially in some semiconductor processes, the parasitic resistance of the Zener tube is relatively large. The voltage will also have a large change

At the same time, the parasitic resistance of the Zener tube has a large temperature coefficient, which will also cause the breakdown voltage of the Zener tube to have a large temperature coefficient when the working environment temperature changes. These two shortcomings limit the figure 1 The application of the circuit in the high voltage circuit

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