Low cost high-voltage input step-down power supply

A step-down power supply and high-voltage technology, applied in emergency protection circuit devices, electrical components, and circuit devices for limiting overcurrent/overvoltage, etc. Maximum input voltage value, low cost effect

Inactive Publication Date: 2009-12-16
镇江恒驰科技有限公司
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  • Abstract
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Problems solved by technology

[0002] The electronic equipment operating in the complex automotive electrical system environment is required to be able to withstand high input surge voltage. The maximum input voltage is an important parameter for designing the power system of automotive electronic products. In order to meet the requirements of the complex working environment of automotive electronic products, it is usually selected Some high withstand voltage power management chips, and the price of these high withstand voltage power management chips is relatively expensive

Method used

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  • Low cost high-voltage input step-down power supply
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Embodiment Construction

[0010] VIN is connected to the positive pole of the external input power supply, and GND is connected to the negative pole of the external input power supply. VOUT is the positive pole of the adjusted output voltage, and the negative pole of the adjusted power supply is output from GND. When the external input voltage is lower than the regulated voltage of the series voltage limiting circuit, the zener diode (5) is equivalent to an open circuit, the Darlington tube (3) is turned on, and the emitter output voltage value is equal to the external input power supply voltage value minus the The saturation voltage drop between the collector and emitter of a Linton tube. When the external input voltage is higher than the breakdown voltage of the Zener diode (5), the tube is turned on and the voltage is clamped at its rated regulated voltage value, and the emitter output voltage of the Darlington tube (3) is approximately a stable Voltage, which is equal to the voltage regulation val...

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Abstract

The invention provides a low-cost high-voltage input step-down power supply, which arranges a primary series voltage-limiting circuit in front of a step-down power circuit for suppressing transient surge voltage existed in voltage of an input power supply, attenuating high voltage input from outside into an acceptable range for providing power supply input for the step-down power circuit. The invention can improve the maximum input voltage of common MOSFET built-in step-down power supply, and can be used for field of vehicular power supply.

Description

technical field [0001] The invention belongs to the field of automobile power supply design, and is a step-down power supply for realizing high input voltage at low cost. Background technique [0002] The electronic equipment operating in the complex automotive electrical system environment is required to be able to withstand high input surge voltage. The maximum input voltage is an important parameter for designing the power system of automotive electronic products. In order to meet the requirements of the complex working environment of automotive electronic products, it is usually selected Some high withstand voltage power management chips, and the price of these high withstand voltage power management chips is relatively expensive. Contents of the invention [0003] The invention is a power supply device which obtains a high power input withstand voltage value at low cost. In order to increase the maximum input voltage value of the common MOSFET built-in step-down powe...

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Application Information

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IPC IPC(8): H02H9/04
Inventor 张育华熊跃平
Owner 镇江恒驰科技有限公司
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