CN201237523Y

CN201237523Y - Energy-saving electronic scale

Info

Publication number: CN201237523Y
Application number: CNU200820085109XU
Authority: CN
Inventors: 陈寿法; 葛府治
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-04-11
Filing date: 2008-04-11
Publication date: 2009-05-13
Anticipated expiration: 2018-04-11

Abstract

The utility model discloses an energy saving electronic scale which comprises a strain sensor, a measuring circuit, a micro controller, a keyboard, a monitor and other like; the strain sensor is connected with the measuring circuit controlled by the micro controller; one end of the strain sensor is connected with an electronic switch; the electronic switch is connected with the micro controller. The micro controller detects the working status of the strain sensor by the measuring circuit; when the energy saving electronic scale works, the electronic switch is connected and the strain sensor continuously supplies power; when the energy saving electronic scale is in the standby state, the connection and the disconnection of the electronic switch are controlled by the micro controller. The energy saving electronic scale effectively solves the problems of the prior electronic scale that the energy consumption is high, the battery needs to be often replaced and the use cost is high, has simple structure, can save energy only by adding an electronic switch with low cost and adjusting the control program, and is worthy of promotion and application.

Description

Energy-saving electronic scale

Technical field

The utility model relates to a kind of electronic weighting equipment, especially relates to a kind of energy-saving electronic scale of using strain gauge transducer.

Background technology

In today that energy shortage contradiction is increasingly sharpened, people wish that various electric equipments can green energy conservation, and electronic scales is no exception.Moreover many electronic scaless directly adopt direct current supply for easy to use, promptly utilize rechargeable battery or dry cell power supply, because the finite capacity of battery, in case when the voltage of battery is lower than normal use value, electronic scales can't guarantee measuring accuracy, even can't work.As adopt battery-driven electronic hanger scale, in use, often need influence work efficiency to its battery charge.Electronic scales adopts strain gauge transducer mostly, the simple constant voltage power supply mode of general at present employing.After electronic scales was opened, the consumed current size was relevant with the supply voltage size on the sensor, is about 10mA～30mA.The so big electric current of long-term consumption becomes one of power consumption link main in the electronic scales on the sensor, is the principal element that limits its working time.In recent years, people have also carried out many useful explorations on the exploitation of energy-saving electronic scale.Open day be that the patent document that July 8, publication number in 1998 are CN2285892 discloses a kind of steelyard automatic power supply device, a generator is installed near the travelling block of crane gib head, generator is realized power transmission by a gearing and above-mentioned travelling block, utilize the lifting of wire rope, the rotation of travelling block, drive motor and finish generating, thereby drive the steelyard operate as normal.Generator is a Dyn., and its output circuit comprises an automatic commutation circuit, and this automatic commutation circuit is to guarantee that gearing when difference turns to, is always steelyard a direct supply is provided.When this device can make steelyard work, no longer need to change battery, thereby prolonged the working time of steelyard, prevent to cross the low steelyard that damages because of cell voltage.But this scheme need be installed generator and commutation circuit near travelling block, not only complex structure, and cost is higher, and also can affect to the use of steelyard.Open day be that the patent document that January 2, publication number in 2008 are CN201000360 discloses a kind of solar energy electronic scale, adopting solar panel is electric energy with the conversion of solar energy that receives, again by charging a battery behind the stable direct current of being transformed to of voltage conversion circuit, and accumulator provides the version of electric energy for the operate as normal of weighing circuit.Solar recharging system can be to the charge in batteries of electronic scales under the sufficient situation of illumination, causes electronic scales to use after avoiding the accumulator electric energy to exhaust, and improves the serviceable life of electronic scales.This scheme needs extra solar panel and the voltage conversion circuit of increasing, and not only increased the volume of electronic scales, and the cost of electronic scales is very high, uses also inconvenience, and in addition, because complex structure, the failure rate of electronic scales also increases greatly.

The utility model content

The utility model is for the energy consumption that solves present electronic scales and exist is big, need often to change battery or charge the battery, problem that use cost the is high and energy-saving electronic scale that a kind of energy consumption is little, service time is long is provided.

Another purpose of the present utility model is for solving the complex structure that present energy-saving electronic scale exists, cost and failure rate height, inconvenient problem with use and a kind of simple in structure, energy-saving electronic scale that cost is low, easy to use is provided.

The utility model is to reach the concrete technical scheme that above-mentioned technical purpose adopts to be: energy-saving electronic scale is by strain gauge transducer, metering circuit, microcontroller and keyboard, compositions such as display, strain gauge transducer connects the metering circuit by microprocessor controls, one end of strain gauge transducer connects electronic switch, electronic switch controling end connects microcontroller, microcontroller detects the duty of strain gauge transducer by metering circuit, during energy-saving electronic scale work, electronic switch is connected, strain gauge transducer is continuous power supply state, during the energy-saving electronic scale standby, the on off operating mode of electronic switch is by microprocessor controls.One end of strain gauge transducer connects electronic switch, be significantly smaller than the characteristics of stand-by time according to the running time of electronic scales, when microcontroller detects strain gauge transducer and is the initialization state by metering circuit, mode by microprocessor controls electronic switch break-make, minimizing is to the supply of electrical energy of strain gauge transducer, reach the power and energy saving, prolong accumulator single charge service time, thereby reach the working time that prolongs the electronic scales single charge, improve the purpose of electronic scales work efficiency.

As preferably, during the energy-saving electronic scale standby, the microprocessor controls electronic switch is interrupted conducting, and strain gauge transducer is the interruptedly supplying power state.During the sensor power supply, microcontroller detects the scale state by metering circuit, realizes the zero-bit following function simultaneously.In addition, strain gauge transducer is adopted the mode of interruptedly supplying power, the temperature variation that can prevent strain gauge transducer is excessive and bring measuring error, guarantees the precision of energy-saving electronic scale.

For being applied in concerning the energy-saving electronic scale of the less demanding occasion of measuring accuracy, in the time of also can adopting the energy-saving electronic scale standby, the microprocessor controls electronic switch turn-offs, and strain gauge transducer is the working forms of off-position.Though this mode has certain influence to the measuring accuracy of energy-saving electronic scale, but owing under the energy-saving electronic scale holding state, stop strain gauge transducer being powered, therefore, the power savings of energy-saving electronic scale is more obvious, and the working time of electronic scales single charge is longer.But because sensor is in off-position always, microcontroller can't enter the state of weighing once more by metering circuit perception electronic scales, so must send a signal to microcontroller by keyboard, informs that the microcontroller electronic scales has reentered the state of weighing.

As preferably, during the energy-saving electronic scale standby, the microprocessor controls electronic switch is interrupted conducting, and its electronic switch conducting is 1 to 5 to 1 to 15 with the time ratio of shutoff.The conducting of electronic switch and turn-off time ratio, can be according to the electronic scales of different occasions to its precision and energy-conservation different requirements, determined after taking all factors into consideration, the time ratio of conducting and shutoff is big more, and is more little to the precision influence of electronic scales, but energy-saving effect is relatively poor relatively, otherwise, the time ratio of conducting and shutoff is more little, and influence will become big to the precision of electronic scales, but energy-saving effect is better relatively.The time ratio of general electronic switch conducting and shutoff is selected between 1 to 5 to 1 to 15, can satisfy most of electronic scaless to precision and requirements of saving energy.

As preferably, electronic switch is arranged on the earth terminal of strain gauge transducer, electronic switch is arranged on the earth terminal of strain gauge transducer, help adopting cheap components and parts such as switch triode as electronic switch, save cost, itself inner integrated electronic switch like this in the device of some metering circuit.Electronic switch also can be arranged on the power input of strain gauge transducer.

The beneficial effects of the utility model are: it is big that it has solved the energy consumption that present electronic scales exists effectively, needs often to change battery or charging, use cost height, problem that utilization rate is low.Simultaneously, also solve the complex structure that present energy-saving electronic scale exists, cost and failure rate height, inconvenient problem with use.The utility model is simple in structure, only need increase an electronic switch with low cost and adjust microcontroller control program and can realize purpose of energy saving, is worthy of popularization.

Description of drawings

Fig. 1 is a kind of circuit structure block scheme of the utility model energy-saving electronic scale.

Fig. 2 is a kind of partial circuit diagram of the utility model energy-saving electronic scale.

Fig. 3 is a kind of workflow diagram of the utility model energy-saving electronic scale.

Embodiment

Below by embodiment, and in conjunction with the accompanying drawings the embodiment of technical solutions of the utility model is further described.

Embodiment 1

Fig. 1 is a kind of circuit structure block scheme of the utility model energy-saving electronic scale, and as can be seen from the figure, energy-saving electronic scale is made up of strain gauge transducer, metering circuit, microcontroller, electronic switch and keyboard, display etc.The local circuit structure of energy-saving electronic scale embodiment 1 as shown in Figure 2, strain gauge transducer UH connects the metering circuit U2 by microcontroller U1 control, the earth terminal of strain gauge transducer UH is by electronic switch SW ground connection, the control end of electronic switch SW connects microcontroller U1, microcontroller U1 detects the duty of strain gauge transducer UH by metering circuit U2, during energy-saving electronic scale work, electronic switch SW connects, strain gauge transducer UH is continuous power supply state, during the energy-saving electronic scale standby, microcontroller U1 control electronic switch SW is interrupted conducting, electronic switch SW every 10 milliseconds of conductings once, ON time is 1 millisecond, and conducting is 1 to 10 with the time ratio of shutoff, and strain gauge transducer UH is the interruptedly supplying power state.

The workflow of energy-saving electronic scale embodiment 1 as shown in Figure 3, after the energy-saving electronic scale start, system carries out initialization and searches zero point, the output data of the strain gauge transducer when energy-saving electronic scale is not placed weight reads, and with it as zero point, microcontroller detects the duty of strain gauge transducer by metering circuit then, if detected data are zero, show that then energy-saving electronic scale is in holding state, microcontroller is interrupted conducting by the programmed control electronic switch, electronic switch every 10 milliseconds of conductings once, ON time is 1 millisecond, conducting is 1 to 10 with the time ratio of shutoff, and this moment, strain gauge transducer was the interruptedly supplying power state, and microcontroller then repeats to detect by metering circuit the duty of strain gauge transducer.When detected data greater than zero, show that then energy-saving electronic scale is in running order, microcontroller is by the conducting of programmed control electronic switch, and this moment, strain gauge transducer was continuous power supply state, and microcontroller is measured weight by metering circuit and it is presented on the display.After the work of weighing was finished, microcontroller repeated again the work of strain-type working sensor status detection.

The working method that embodiment 2 adopts is: during energy-saving electronic scale work, electronic switch SW connects, and strain gauge transducer UH is continuous power supply state; During the energy-saving electronic scale standby, microcontroller U1 detects back control electronic switch SW and turn-offs, and strain gauge transducer UH is an off-position, and electronic switch SW is connected the power input of strain gauge transducer UH, and all the other are identical with embodiment 1.

Embodiment 2

The workflow of embodiment 2 is substantially the same manner as Example 1, and just when microcontroller detected energy-saving electronic scale and is in holding state, the microprocessor controls electronic switch turn-offed, and this moment, strain gauge transducer was an off-position.Because sensor is in off-position always, microcontroller can't know that scale enters the state of weighing once more by metering circuit, when therefore weighing again, by pressing a certain key on the electronic scales keyboard, inform that the microcontroller electronic scales has entered the state of weighing, all the other are identical with embodiment 1.

Claims

1. energy-saving electronic scale, form by strain gauge transducer, metering circuit, microcontroller and keyboard, display etc., strain gauge transducer connects the metering circuit by microprocessor controls, it is characterized in that: the end of described strain gauge transducer UH connects electronic switch SW, electronic switch SW connects microcontroller, during energy-saving electronic scale work, electronic switch SW connects, strain gauge transducer UH is continuous power supply state, during the energy-saving electronic scale standby, the on off operating mode of electronic switch SW is by microprocessor controls.

2. energy-saving electronic scale according to claim 1 is characterized in that described electronic switch SW is arranged on the earth terminal of strain gauge transducer UH.

3. energy-saving electronic scale according to claim 1 is characterized in that described electronic switch SW is arranged on the power input of strain gauge transducer UH.