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发明授权
CN1877992B 最大电压检测电路和最小电压检测电路 失效 - 权利终止 转让

最大电压检测电路和最小电压检测电路
摘要：
本发明涉及在多个输入电压内检测最高电压的最大电压检测电路和检测最低电压的最小电压检测电路。其目的在于提供一种不需要输入电流的最大电压检测电路和最小电压检测电路。在电源电位和结点N1之间连接特性相同的NMOS11～1n，向各栅极提供输入电压IN1～INn，结点N1经由恒流电路(2)接地。在电源电位和结点N2之间连接特性相同的NMOS4，经由恒流电路(4)将结点N2接地。将结点N1、N2连接到运算放大器(3)的输入侧上，将其输出电压OUT提供给NMOS4的栅极。如果输入电压IN1最高，则NMOS11为导通，结点N1成为输入电压IN1-阈值电压VT。此外，结点N2成为输出电压OUT-阈值电压VT。因为NMOS1、4的阈值电压VT相等，所以输出电压OUT＝输入电压IN1，最高输入电压作为输出电压OUT输出。因为对NMOS的栅极施加输入电压IN，所以不流过输入电流。
摘要（英）：

The invention relates to a maximal voltage detection circuitry and a minimum voltage detection circuitry among a plurality of input voltages, which aims to provide a maximal voltage detection circuitry and a minimum voltage detection circuitry free of input current flow. NMOS11-1n with identical properties are connected between a power electric potential and a binding site N1 to supply input voltages IN1-Inn for each grid. The binding site N1 is grounded by a constant current circuit (2). NMOS4 with identical properties is connected between the power electric potential and a binding site N2 and the binding site N2 is grounded by a constant current circuit (4). The binding sites N1 and N2 are connected with the input end of an operational amplifier (3) and offer their output voltages OUT to the grid of NMOS4. If the input voltage IN1 is the highest, the NMOS11 is conducted and the binding site N1 becomes the input voltage IN1-threshold voltage VT. Furthermore, the binding site N2 becomes the output voltage OUT-threshold voltage VT. Since the threshold voltages VT of NMOS1 and NMOS4 are the same, the output voltage OUT equals to the input voltage IN1. The highest input voltage is output as an output voltage. Since the input voltage IN is exerted on the grid of NMOS, the input current flow is not flowed over.

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