CN2251713Y

CN2251713Y - Ultra-low power dissipation operation display device for flow meter

Info

Publication number: CN2251713Y
Application number: CN 95227289
Authority: CN
Inventors: 张涛
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-23
Filing date: 1995-11-23
Publication date: 1997-04-09
Anticipated expiration: 2005-11-23

Abstract

The utility model discloses an ultra-low power dissipation operation display device for a flow meter, composed of a 89C52 or a 89C51 monolithic computers, a monitoring timer, an oscillator, an LCD device, a drive circuit for the LCD device, etc. The oscillator and the monitoring timer share a CD4060 integrated circuit chip; the LCD and the monitoring timer share a 74HC02 integrated circuit chip. The utility model has the advantages of simple circuit construction and low power consumption, and can be widely used for field measurement.

Description

The super low-power consumption computing display device that flow instrument is used

The utility model is about flow measurement instrument, and more particularly, the utility model is the computing display device of using about flow instrument.

The Flow Measurement Display Meter of Xiao Shouing in the market, generally constitute by 8031 single-chip microcomputers, driving circuit and display etc., the flow sensor of above-mentioned display instrument and pulse output, for example turbine flow transducer, vortex flow sensors etc. cooperate and form Flow Measuring System, can demonstrate mean flow rate, instantaneous delivery, frequency and flow total amount etc. that sensor records exactly.This instrument weak point is that power consumption is bigger, thereby is unsuitable for on-the-spot the use.

The purpose of this utility model is to overcome weak point of the prior art, and a kind of flow computing display device of super low-power consumption is provided, can be with battery as power supply.

The purpose of this utility model is achieved by following technical proposals.

Single-chip microcomputer 89C52 or 89C51 connect supervision timer and LCD and driving circuit thereof respectively, and oscillator connects LCD and driving circuit and supervision timer respectively.

The shared 1 CD4060 integrated circuit chip of described oscillator and supervision timer, the shared 1 74HC02 integrated circuit chip of described LCD and supervision timer.

The utility model will be further described below in conjunction with accompanying drawing.

Fig. 1 is the utility model circuit block diagram;

Fig. 2 is oscillator and supervision timer circuit diagram.

Single-chip microcomputer selects for use 89C52 or 89C51 all can.The single-chip microcomputer of described model contains microprocessor, program storage, data-carrier store, counter, timer, interrupt control and input/output port etc., thereby the IO channel in the utility model, shows that control, parameter insert circuit interface etc. and all can utilize mcu resource.Be fed to counter in the single-chip microcomputer from the signal of flow sensor, provide 1 second regularly by the timer in the single-chip microcomputer simultaneously, so p.s. is to the counter once sampling.This sampled value obtains instantaneous delivery after single-chip microcomputer carries out computing, meanwhile, the processing of another timer in single-chip microcomputer, provide the digital signal output that is directly proportional with it, instantaneous delivery is added on the past value of integrated flux then, obtain the integrated flux currency.Instantaneous delivery or integrated flux are shown by LCD.

Oscillator is made of half sheet CD4060 integrated circuit chip and Resistor-Capacitor Unit.It sends a frequency signal to liquid crystal indicator, to keep its operate as normal.

Supervision timer is commonly called as house dog, is made of half sheet 74HC02 integrated circuit chip and half sheet CD4060 integrated circuit chip.It is used to prevent program fleet.As shown in Figure 2, the oscillator sum counter in the shared CD4060 integrated circuit chip of oscillator and supervision timer.On its Q6 pin, provide for liquid crystal indicator.Frequency signal source.If program fleet, the zero clearing reset terminal RST of CD4060 did not receive the reset signal of rice from one-chip machine port within about 1 second, its Q14 pin output signal is by OR circuit, i.e. half sheet 74HC02 integrated circuit chip, single-chip microcomputer is resetted, promptly force it to recover operate as normal.The purpose of use OR circuit not instrument can be passed through supervision timer, and can carry out reset operation to single-chip microcomputer by the coupled electrify restoration circuit that is made of the C1R1 element.

Liquid crystal indicator is made of half sheet 74HC02 integrated circuit chip and LCD.LCD drive circuits is used the integrated circuit chip of corresponding number according to the figure place that shows.For example, 6 CD4056 integrated circuit chips are adopted in 6 demonstrations.

With prior art phase warp, the beneficial effects of the utility model be embodied in circuit structure simple, be easy to make; Micro power consumption, 3 volts of voltages, 0.7 milliampere of average current.

Claims

1. super low-power consumption computing display device that flow instrument is used, comprise single-chip microcomputer, driving circuit and display device, it is characterized in that, described single-chip microcomputer adopts 89C52 or 89C51, it connects supervision timer and LCD and driving circuit thereof respectively, and oscillator connects LCD and driving circuit and supervision timer respectively.

2. computing display device according to claim 1 is characterized in that, the shared 1 CD4060 integrated circuit chip of described oscillator and supervision timer, the shared 1 74HC02 integrated circuit chip of described LCD and supervision timer.