CN202565237U

CN202565237U - Voltage comparator provided with signal locking function

Info

Publication number: CN202565237U
Application number: CN2012202565084U
Authority: CN
Inventors: 高仁献; 陈振宇
Original assignee: ZHEJIANG KEYUE WELDING EQUIPMENT CO Ltd
Current assignee: ZHEJIANG KEYUE WELDING EQUIPMENT CO Ltd
Priority date: 2012-05-16
Filing date: 2012-05-16
Publication date: 2012-11-28
Anticipated expiration: 2022-05-16

Abstract

The utility model relates to a voltage comparator provided with a signal locking function. According to the voltage comparator, a reference voltage is connected to a noninverting end of the voltage comparator; input voltage is connected to an inverting end of the voltage comparator; and an output end of the voltage comparator is connected to the noninverting end of the voltage comparator through a time-delay closing switch. The voltage comparator of the utility model is advantageous in that output voltage is applied to the noninverting end of the voltage comparator after a certain time delay such that the reference voltage is raised to a maximum value or reduced to a minimum value, as a result, even if the input voltage fluctuates in a certain range, the output voltage is not affected, at the same time, the time-delay closing switch can ensure successful initialization of a system and acquire a sampling value. With the voltage comparator of the utility model which is of structural simplicity, one reference voltage is only needed to be selected and set so as to stably maintain the output of initial states of the system.

Description

Voltage comparator with semaphore lock function

Technical field

The utility model relates to a kind of voltage comparator with semaphore lock function.

Background technology

Voltage comparator is a kind of the input analog voltage signal to be compared with the reference voltage of setting, the two amplitude equate near, but output voltage transition becomes corresponding high level or low level device.In practical application,, reach off-limit alarm prompting etc. through being usually used in analog to digital conversion, waveform generation and conversion.Simultaneously, voltage comparator should it belong to the demand of systemic-function, also can be used to distinguish and output system state initial value; Such as in the dual-purpose system of single-phase three-phase voltage; For ease of the residing power supply environment of User Recognition system, during system design, consider in the power supply environmental change; Be after input supply voltage changes, the corresponding power supply environment that provides is indicated.Yet, owing to generally all allowing the supply voltage of certain limit, system imports fluctuation, be not taken near the generation of the reference voltage output state transition of monodrome, make that the selection of reference voltage and setting are relatively more difficult, and system's power supply state identification circuit is more complicated also.

Summary of the invention

The purpose of the utility model is to overcome the defective of prior art, and a kind of voltage comparator with semaphore lock function that output voltage is loaded on the in-phase end of voltage comparator behind a fixed response time is provided.

For realizing above-mentioned purpose; The utility model adopts a kind of like this voltage comparator with semaphore lock function; Reference voltage is connected to the in-phase end of described voltage comparator; Input voltage is connected to the end of oppisite phase of described voltage comparator, the output of described voltage comparator, and process timing closing switch is connected to the in-phase end of described voltage comparator.

Especially; Described timing closing switch comprises relay and delay circuit; Described delay circuit comprises resistance and electric capacity; The line bag of described relay is connected to the two ends of said electric capacity, and the two ends of the normally opened contact of described relay are connected to the in-phase end and the output of described voltage comparator respectively.

Especially; Described timing closing switch comprises the first optocoupler unit, the second optocoupler unit, delay circuit and voltage-stabiliser tube; Described delay circuit comprises resistance and electric capacity; Be connected to the two ends of described electric capacity after the input serial connection of the input of said voltage-stabiliser tube, the described first optocoupler unit and the described second optocoupler unit; Seal in first diode and second diode between the emitter-base bandgap grading end of the described first optocoupler unit and the collector terminal of the described second optocoupler unit; Tie point between described first diode and described second diode is connected to the in-phase end of described voltage comparator, is connected to the output of described voltage comparator behind the emitter-base bandgap grading end of the described second optocoupler unit of the collector terminal short circuit of the described first optocoupler unit.

Compared with present technology; The beneficial effect of the utility model is embodied in: owing to the in-phase end that output voltage is loaded on voltage comparator behind a fixed response time; Make reference voltage be raised to maximum or be reduced to minimum value,, can't influence output voltage even input voltage fluctuates within the specific limits like this; Simultaneously, the timing closing switch can be guaranteed system's success initialization and obtain sampled value.The utlity model has simple in structurely, only need select and set a reference voltage, can stablize the output that keeps system initial state.In addition, be connected in series into voltage-stabiliser tube through the input at optocoupler, can strengthen the ON time of optocoupler, assurance system operation sequential is normal.

Description of drawings

Fig. 1 is a kind of principle block diagram with voltage comparator of semaphore lock function of the utility model;

Fig. 2 is the schematic diagram that the utility model embodiment 1 has the voltage comparator of semaphore lock function;

Fig. 3 is the schematic diagram that the utility model embodiment 2 has the voltage comparator of semaphore lock function.

Embodiment

As shown in Figure 1; A kind of voltage comparator with semaphore lock function; Reference voltage Vref is connected to the in-phase end of voltage comparator U2; Input voltage Vi is connected to the end of oppisite phase of voltage comparator U2, the output end vo of voltage comparator U2, and process timing closing switch U1 is connected to the in-phase end of voltage comparator U2.

The specific embodiment 1 of the utility model is as shown in Figure 2; Timing closing switch U1 comprises relay K 1 and delay circuit; Delay circuit comprises resistance R 3 and capacitor C 1; The line bag of relay is connected to the two ends of capacitor C 1, and the two ends of the normally opened contact of relay are connected to in-phase end and the output of voltage comparator U2 respectively.

The specific embodiment 2 of the utility model is as shown in Figure 3; Timing closing switch U1 comprises the first optocoupler unit P1, the second optocoupler unit P2, delay circuit and voltage-stabiliser tube Z1; Delay circuit comprises resistance R 3 and capacitor C 1; Be connected to the two ends of capacitor C 1 after the input serial connection of the input of voltage-stabiliser tube Z1, the first optocoupler unit P1 and the second optocoupler unit P2; Seal in the first diode D1 and the second diode D2 between the collector terminal of the emitter-base bandgap grading end of the first optocoupler unit P1 and the second optocoupler unit P2; Tie point between the first diode D1 and the second diode D2 is connected to the in-phase end of voltage comparator U2, is connected to the output of voltage comparator U2 behind the emitter-base bandgap grading end of the collector terminal short circuit second optocoupler unit P2 of the first optocoupler unit P1.

When the output end vo of voltage comparator U2 was high level, output voltage increased reference voltage Vref rapidly and closes on maximum VCC through the pin 8 of the first optocoupler unit P1, the in-phase end that the first diode D1 feeds back to voltage comparator U2; When the output end vo of voltage comparator U2 was low level, output voltage reduced reference voltage Vref rapidly through the pin 6 of the second optocoupler unit P2, the in-phase end that the second diode D2 feeds back to voltage comparator U2, near minimum value VEE, formed semaphore lock.

Claims

1. voltage comparator with semaphore lock function; Reference voltage is connected to the in-phase end of described voltage comparator; Input voltage is connected to the end of oppisite phase of described voltage comparator; It is characterized in that: the output of described voltage comparator, process timing closing switch is connected to the in-phase end of described voltage comparator.

2. the voltage comparator with semaphore lock function according to claim 1; It is characterized in that: described timing closing switch comprises relay and delay circuit; Described delay circuit comprises resistance and electric capacity; The line bag of described relay is connected to the two ends of said electric capacity, and the two ends of the normally opened contact of described relay are connected to the in-phase end and the output of described voltage comparator respectively.

3. the voltage comparator with semaphore lock function according to claim 1; It is characterized in that: described timing closing switch comprises the first optocoupler unit, the second optocoupler unit, delay circuit and voltage-stabiliser tube; Described delay circuit comprises resistance and electric capacity; Be connected to the two ends of described electric capacity after the input serial connection of the input of said voltage-stabiliser tube, the described first optocoupler unit and the described second optocoupler unit; Seal in first diode and second diode between the emitter-base bandgap grading end of the described first optocoupler unit and the collector terminal of the described second optocoupler unit; Tie point between described first diode and described second diode is connected to the in-phase end of described voltage comparator, is connected to the output of described voltage comparator behind the emitter-base bandgap grading end of the described second optocoupler unit of the collector terminal short circuit of the described first optocoupler unit.