High-power-supply-voltage selection circuit suitable for medium-high-voltage work and implementation method thereof
A voltage selection and power supply voltage technology, applied in the field of high power supply voltage selection circuit, can solve the problem that the maximum voltage selection circuit is not suitable for high-voltage power supply selection, etc., and achieve the effect of simple structure, high application value and low cost
Active Publication Date: 2019-12-31
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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[0005] The purpose of the present invention is to provide a high power supply voltage selection circuit suitable for medium and high voltage work and its implementation method, mainly to solve the situation that the existing maximum voltage selection circuit is not suitable for high voltage power supply selection
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[0042] Such as figure 2As shown, a high power supply voltage selection circuit suitable for medium and high voltage work disclosed in the present invention includes a resistor R1 connected to the input terminal V1 of the medium and high voltage power supply voltage, and an NMOS transistor whose gate and drain are connected to the other end of the resistor R1 MN0, the NMOS transistors MN1 and MN2 whose gate is connected to the gate of the NMOS transistor MN0, the Zener voltage regulator diode D3 whose cathode is connected to the sources of the NMOS transistors MN0, MN1, and MN2, and the gate and Zener voltage regulator diode D3 The NMOS transistors MN3 and MN4 connected to the anode of the NMOS transistor MN4, the NMOS transistor MN5 whose drain is connected to the source of the NMOS transistor MN4, the flip-flop I0 whose input terminal is connected to the drain of the NMOS transistor MN4, and whose output terminal is connected to the gate of the NMOS transistor MN5 , the inve...
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The invention discloses a high-power-supply-voltage selection circuit suitable for medium-high-voltage work, and mainly solves the problem that the existing maximum voltage selection circuit is not suitable for high-voltage power supply selection. The circuit comprises low-voltage 5V NMOS devices MN0-MN6, a 5V PMOS devices MP0, MP1s which are asymmetric high-voltage PMOS devices MP1H and MP2H, asymmetric high-voltage NMOS devices MNH1 and MNH2, two matching resistors R1 and R2 with the same size and area, hysteresis control resistors R3 of the comparator, gate control resistors R4 and R5 of the MP2H and MP1H,, Zener voltage stabilizing diodes D0-D3, an analog current source Ib which may be replaced with a resistor, a buffer A1 for improving the driving capability, a Schmitt trigger I0 withoutput inversion, and inverters I1 and I2. Through the design, the circuit is suitable for a circuit for selecting a high-voltage power supply, realizes the selection of the high-voltage power supply, and meets the characteristics of low cost, low power consumption and the like. Therefore, the device has very high use value and popularization value.
Description
technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a high power supply voltage selection circuit suitable for medium and high voltage operation and its realization method. Background technique [0002] It is often necessary to use a maximum voltage selection circuit in an integrated circuit. The main function of the maximum voltage selection circuit is to select a maximum voltage output from multiple existing voltages for use by other circuits in the integrated circuit. [0003] Such as figure 1 Shown is the power selection circuit in traditional low-voltage 5V conventional applications. The working voltage of V1 and V2 is the maximum 5V. Both MP1 and MP2 are 5V PMOS tubes. A1 is a comparator with hysteresis. Of course, the A1 comparator is also 5V. The function of this circuit is to make VOUT equal to the higher voltage of V1 and V2, so as to realize the function of high power supply voltage selection. [0004] Suc...
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IPC IPC(8): H03K17/567
CPCH03K17/567
Inventor 陈鑫
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD