Multi-output state hysteresis comparator
A hysteretic comparator and multi-output technology, which is applied in the field of hysteretic comparators to achieve the effects of being suitable for promotion, simple in circuit structure and convenient for adjustment
Inactive Publication Date: 2015-08-26
LANZHOU UNIVERSITY
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[0004] The purpose of the present invention is to propose a hysteresis comparator capable of producing multiple output states in the hysteresis interval, aiming at the defect that the existing hysteresis comparator only has two output states of high and low levels
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[0024] Taking the design of four output states of a single hysteresis comparator as an example, the design principle of the multi-output state hysteresis comparator of the present invention will be explained in detail below.
[0025] like figure 2 As shown, the first operational amplifier U1, the second operational amplifier U2, the first diode D1, the second diode D2 and the nineteenth resistor R19 form the first window comparator, V ref2 , V ref3 are the upper and lower voltage limits of the first window comparator, and V ref2 >V ref3 . The fourth operational amplifier U4, the fifth operational amplifier U5, the third diode D3, the fourth diode D4 and the twentieth resistor R20 form a second window comparator, V ref4 , V ref5 are the upper and lower voltage limits of the second window comparator, and V ref4 >V ref5 . The first resistor R1, the second resistor R2 and the third operational amplifier U3 form a hysteresis comparator, V ref1 is the center voltage value ...
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The invention provides a multi-output state hysteresis comparator comprising a hysteresis comparator, a plurality of window comparators, simulation switches at the same number as the window comparators, and a multivariable anti-phase adder; input ends of the hysteresis comparator and the window comparators are respectively connected with an input voltage; output ends of the window comparators are respectively connected with input ends of the simulation switches; output ends of the simulation switches are respectively connected with an input end of the multivariable anti-phase adder; an output end of the hysteresis comparator is respectively connected with control ends of the simulation switches and the input end of the multivariable anti-phase adder; an output end of the multivariable anti-phase adder is connected with an output voltage. The single hysteresis comparator can generate a plurality of output states, and solves the disadvantages that a conventional single hysteresis comparator can only output two states; the multi-output state hysteresis comparator can be realized completely through existing circuit modules, is simple in circuit structure, and convenient in adjustment.
Description
technical field [0001] The invention relates to a hysteresis comparator, in particular to a hysteresis comparator with multiple output states. Background technique [0002] The hysteresis comparator is a commonly used comparator and is widely used in the field of industrial control. The voltage comparison threshold of the hysteresis comparator is determined according to the output state. When the output is high, the voltage comparison threshold is high, and when the output is low, the voltage comparison threshold is low, so a voltage hysteresis interval. Due to the existence of the voltage hysteresis interval, the entire hysteresis has a certain "inertia", so it has strong anti-interference ability, and has a wide range of applications in the field of industrial control, and is often used as a switching control part of chaotic systems. [0003] However, the output of the existing hysteresis comparator has only two states of high and low levels, and the output state is sing...
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IPC IPC(8): H03K5/22
Inventor 朱娟峰李守亮马义德杜娟刘冀钊周爽
Owner LANZHOU UNIVERSITY