CN207991663U - A kind of electronic scale of lithium battery power supply - Google Patents

Abstract

The utility model discloses an electronic scale powered by a lithium battery, which comprises a charger, a lithium battery charging management circuit, a lithium battery, a weighing sensor, an analog-to-digital converter, a single-chip microcomputer, a keyboard, a display, a liquid crystal VLCD, a low-voltage differential linear A voltage stabilizing circuit and a diode voltage adjusting circuit, the input of the charger is connected to the municipal power supply, the output of the charger is connected to the input of the lithium battery charging management circuit, the output of the lithium battery charging management circuit is connected to the lithium battery, and the lithium battery The battery directly supplies power to the analog-to-digital converter, single-chip microcomputer, and display. The load cell is powered by the stable voltage generated inside the analog-to-digital converter. The low-dropout linear voltage regulator circuit stabilizes the output voltage of the lithium battery and outputs it to the LCD VLCD, the diode voltage adjustment circuit adjusts the output voltage of the lithium battery and then outputs it to the liquid crystal VLCD. The utility model makes full use of the battery power of the lithium battery and improves the battery life of the electronic scale.

Description

Electronic scale powered by lithium battery

technical field

The utility model relates to the technical field of electronic scales, in particular to an electronic scale powered by a lithium battery.

Background technique

The electronic scale converts the weight signal (or pressure signal) into an analog voltage signal through the load cell, and the analog voltage signal is converted into a digital signal by the analog-to-digital converter for processing by the single-chip microcomputer. The single-chip microcomputer controls the weight information through the The display shows up. The power supply of load cells, analog-to-digital converters, single-chip microcomputers and displays is usually provided by a low-dropout linear regulator circuit or a step-down DC/DC circuit. The low-dropout linear regulator circuit generates low power supply noise, but its conversion efficiency is low. As a result, the battery life of the electronic scale is short; although the step-down DC/DC circuit has high conversion efficiency, it generates large power supply noise, which affects the accuracy of the electronic scale, and requires additional components such as power inductors to increase the cost of the electronic scale.

Currently, electronic scales are mainly powered by 4V lead-acid batteries, which are bulky, heavy, and not environmentally friendly. With the shortage of energy and the country's emphasis on environmental protection, lead-acid batteries are likely to gradually transition to more environmentally friendly and lightweight lithium batteries.

Contents of the invention

The purpose of this utility model is to provide an electronic scale powered by a lithium battery to solve the problems of increasing the battery life of the electronic scale and reducing the cost of the electronic scale proposed in the above background technology.

In order to achieve the above object, the utility model provides the following technical solutions: an electronic scale powered by a lithium battery, including a charger, a lithium battery charging management circuit, a lithium battery, a load cell, an analog-to-digital converter, a single-chip microcomputer, a keyboard, and a display , a liquid crystal sheet VLCD, a low-dropout linear voltage regulator circuit and a diode voltage adjustment circuit, the input of the charger is connected to the municipal power supply, the output of the charger is connected to the input of the lithium battery charging management circuit, and the input of the lithium battery charging management circuit The output is connected to the lithium battery, and the lithium battery directly supplies power to the analog-to-digital converter, the single-chip microcomputer, and the display. The load cell is powered by the stable voltage generated inside the analog-to-digital converter. The voltage stabilizing circuit stabilizes the output voltage of the lithium battery and outputs it to the liquid crystal panel VLCD, and the diode voltage adjusting circuit adjusts the output voltage of the lithium battery and then outputs it to the liquid crystal panel VLCD.

Preferably, the allowable output voltage range of the charger is 4.5V-6.0V, and the working voltage range of the lithium battery is 2.8V-4.2V.

Preferably, the model of the single-chip microcomputer is SH88F2051AL, and the model of the analog-to-digital converter is HX717.

Preferably, the display 8 is any one of a digital tube display and a liquid crystal display.

Preferably, the load cell converts the pressure signal into an analog voltage signal, and the analog-to-digital converter converts the analog voltage signal output by the load cell into a digital signal for processing by the single-chip microcomputer; at the same time, a stable voltage is generated for the load cell Power supply, the single-chip microcomputer processes the digital signal output by the analog-to-digital converter, and converts it into weight information and displays it on the display.

Compared with the prior art, the beneficial effects of the utility model are:

1. The utility model adopts a lithium battery charging management circuit, and charges according to the characteristics of the lithium battery, and will not cause damage to the life of the lithium battery due to the charging action.

2. The utility model adopts a lithium battery charging management circuit, even if the electronic scale is not turned on for charging, there will be no danger of overcharging.

3. The utility model adopts the lithium battery to supply power to the analog-to-digital converter, the single-chip microcomputer and the display, fully uses the battery power of the lithium battery, and improves the battery life of the electronic scale.

4. The utility model does not use a low-dropout linear regulator or a step-down DC/DC circuit to supply power to an analog-to-digital converter, a single-chip microcomputer, and a display, thereby reducing the cost of an electronic scale.

Description of drawings

Fig. 1 is the structural representation of the first embodiment of the utility model;

Fig. 2 is the structural representation of the second embodiment of the utility model;

Fig. 3 is the structural representation of the third embodiment of the utility model;

Fig. 4 is the schematic diagram of the first embodiment of the utility model;

Fig. 5 is the schematic diagram of the second embodiment of the utility model;

Fig. 6 is the schematic diagram of the third embodiment of the utility model;

Fig. 7 is a schematic diagram of a charging management circuit of a lithium battery according to an embodiment of the present invention;

Fig. 8 is a schematic diagram of a diode voltage adjustment circuit according to the third embodiment of the present invention.

In the figure: charger-1, lithium battery charging management circuit-2, lithium battery-3, load cell-4, analog-to-digital converter-5, single-chip microcomputer-6, keyboard-7, display-8, liquid crystal VLCD- 9. Low-dropout linear regulator circuit-10. Diode voltage regulator circuit-11.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Embodiment one

Referring to Fig. 1, a kind of electronic scale powered by lithium battery of the present utility model comprises charger 1, lithium battery charging management circuit 2, lithium battery 3, weighing sensor 4, analog-to-digital converter 5, single-chip microcomputer 6, keyboard 7 and Nixie tube display. The input of the charger 1 is connected to the mains, and the output of the charger 1 is connected to the input of the lithium battery charging management circuit 2; the output of the lithium battery charging management circuit 2 is connected to the lithium battery 3; the lithium battery 3 directly supplies The analog-to-digital converter 5, the single-chip microcomputer 6 and the nixie tube display are powered; the load cell 4 is powered by the stable voltage generated inside the analog-to-digital converter 5; the keyboard 7 is input to the single-chip microcomputer 6. In this embodiment, the allowable output voltage range of the charger 1 is 4.5V-6.0V, and the working voltage range of the lithium battery 3 is 2.8V-4.2V. Referring to FIG. 4 , in this embodiment, the model of the single-chip microcomputer 6 is SH88F2051AL, and the model of the analog-to-digital converter 5 is HX717.

Embodiment two

Referring to Fig. 2, a lithium battery-powered electronic scale of the present invention includes a charger 1, a lithium battery charging management circuit 2, a lithium battery 3, a load cell 4, an analog-to-digital converter 5, a single-chip microcomputer 6, a keyboard 7, The liquid crystal display panel VLCD9 and the low dropout linear regulator circuit 10. The difference compared with Embodiment 1 is that the display 8 is changed from a nixie tube display to a liquid crystal display, the liquid crystal display drive controller is powered by a lithium battery 3 , and the liquid crystal display liquid crystal sheet VLCD9 is powered by a low dropout linear regulator circuit 10 .

In this embodiment, the allowable output voltage range of the charger 1 is 4.5V to 6.0V, the allowable operating voltage range of the liquid crystal display panel VLCD9 is 3.0V to 3.3V, and the output voltage of the corresponding low dropout linear regulator circuit 10 is 3.0V to 3.3V. V, the operating voltage range of the lithium battery 3 is 3.1V-4.2V.

Embodiment Three

Referring to Fig. 3, a lithium battery-powered electronic scale of the present invention includes a charger 1, a lithium battery charging management circuit 2, a lithium battery 3, a load cell 4, an analog-to-digital converter 5, a single-chip microcomputer 6, a keyboard 7, The liquid crystal display includes a liquid crystal sheet VLCD9 and a diode voltage adjustment circuit 11 . Compared with the second embodiment, the difference lies in that the liquid crystal panel VLCD9 of the liquid crystal display is powered by the diode voltage adjustment circuit 11 .

In this embodiment, the allowable output voltage range of the charger 1 is 4.5V-6.0V, the output voltage range of the diode voltage adjustment circuit 11 is 3.0V-3.6V, the working voltage of the liquid crystal display VLCD9 is 3.3V, and the working voltage of the lithium battery 3 The range is 3.0V ~ 4.2V.

A kind of lithium battery-powered electronic scale of the present utility model, referring to Fig. 1-8, by increasing the lithium battery charge management circuit 2, has improved the service life and use safety of lithium battery 3; 5, single-chip microcomputer 6 and display 8 supply power, improve the service efficiency of lithium battery 3, increase the battery life of electronic scale; by removing the cost of electronic scale by removing the analog-to-digital converter 5, single-chip microcomputer 6 and display 8; so greatly improve The product competitiveness of the electronic scale powered by lithium battery 3 has been greatly improved.

It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from all points of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to fall within the scope of the claims All changes within the meaning and range of equivalents of the required elements are included in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (5)

1. a kind of electronic scale of lithium battery power supply, which is characterized in that including, charger (1), lithium battery charging management circuit (2), Lithium battery (3), weighing sensor (4), analog-digital converter (5), microcontroller (6), keyboard (7), display (8), LCD panel VLCD (9), the input of low-dropout linear voltage-regulating circuit (10) and diode voltage adjustment circuit (11), the charger (1) connects municipal administration Power supply, the output of the charger (1) connect the input of lithium battery charging management circuit (2), the lithium battery charging management circuit (2) output connects lithium battery (3), and the lithium battery (3) supplies directly to analog-digital converter (5), microcontroller (6), display (8) Electricity, the weighing sensor (4) are powered by the burning voltage generated inside analog-digital converter (5), and the keyboard (7) is input to list Piece machine (6), the low-dropout linear voltage-regulating circuit (10) export after lithium battery (3) output voltage is carried out voltage stabilizing to LCD panel VLCD (9), the diode voltage adjustment circuit (11) export after being adjusted lithium battery output voltage to LCD panel VLCD (9)。

2. a kind of electronic scale of lithium battery power supply according to claim 1, it is characterised in that：The charger (1) is permitted Perhaps output voltage range is 4.5V~6.0V, and lithium battery (3) operating voltage range is 2.8V~4.2V.

3. a kind of electronic scale of lithium battery power supply according to claim 1, it is characterised in that：Microcontroller (6) model For SH88F2051AL, analog-digital converter (5) the model HX717.

4. a kind of electronic scale of lithium battery power supply according to claim 1, it is characterised in that：The display (8) is number Code tube display and liquid crystal display in any one.

5. a kind of electronic scale of lithium battery power supply according to claim 1, it is characterised in that：The weighing sensor (4) Pressure signal is converted to analog voltage signal, the analog voltage that the analog-digital converter (5) exports weighing sensor (4) is believed Number it is converted to digital signal, is handled for microcontroller (6)；Burning voltage is generated simultaneously to power to weighing sensor (4), it is described Microcontroller (6) handles the digital signal that analog-digital converter (5) exports, and is converted into weight information and passes through display (8) It shows.