CN105403302A - Small electronic scale - Google Patents
Small electronic scale Download PDFInfo
- Publication number
- CN105403302A CN105403302A CN201510967540.1A CN201510967540A CN105403302A CN 105403302 A CN105403302 A CN 105403302A CN 201510967540 A CN201510967540 A CN 201510967540A CN 105403302 A CN105403302 A CN 105403302A
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- CN
- China
- Prior art keywords
- key group
- coupled
- lead
- terminal
- out terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/62—Over or under weighing apparatus
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
The invention provides a small electronic scale. The electronic scale comprises a scale disc and an operating machine. The operating machine comprises a display screen, a control key group, an object key group, a digital key group and a power supply. The display screen is connected with the power supply. The control key group is connected to the power supply and the display screen. The object key group is connected to the control key group. The digital key group is connected to the control key group and the object key group. According to the invention, the power supply has very high transition efficiency, and can provide power for the system just with one or two dry cells, so size and weight of the electronic scale are greatly reduced and portable design is achieved.
Description
Technical field
The present invention relates to appliance and electronic field, particularly a kind of small-size electronic scale.
Background technology
Electronic scales is seen everywhere in people's daily life.Such as, at the supermarket, the place such as fruit shop all needs to use electronic scales to weigh article.Local at these, type of goods is various, and existing electronic scales volume is large, and weight is at 2-3 kilogram, and its volume and weight, primarily of shared by battery, often needs 4-6 batteries could meet needs of powering.
How providing the electronic scales that a kind of battery volume is little and energy-conservation again, is current problem demanding prompt solution.
Summary of the invention
The present invention proposes a kind of small-size electronic scale, solves that existing small-size electronic scale volume is large, the problem of Heavy Weight.
Technical scheme of the present invention is achieved in that
A kind of small-size electronic scale, comprises the scale pan; And manipulator, described manipulator comprises power supply; Display screen, described display screen is connected to described power supply; Operating key group, described operating key group is connected to described power supply and described display screen; Article key group, described article key group is connected to described operating key group; And numerical key group, described numerical key group is connected to described operating key group and described article key group; Power supply, comprising: input port, receives input voltage; Output port, provides output voltage; Rectification unit, is coupled to input port and receives input voltage, produce commutating voltage; Transformer, comprises former limit winding and vice-side winding, and its limit, Central Plains winding and vice-side winding respectively have the first terminal and the second terminal, and the first terminal of former limit winding is coupled to rectification unit and receives commutating voltage, and the second terminal of vice-side winding connects secondary side reference ground; Former limit power switch, is coupled between the second terminal of former limit winding and reference ground, former limit; Secondary side diode, is coupled between the first terminal of vice-side winding and output port; Output capacitor, is coupled between output port and secondary side reference ground; Feedback component, comprises secondary part and former edge is divided; Secondary contact resistance, the first Zener diode and former limit contact resistance, wherein the secondary part of feedback component, secondary contact resistance and the first Zener diode are coupled in series between output port and secondary side reference ground, divide generation feedback voltage with the former edge in feedback component; Error amplifier, there is in-phase input end, inverting input and lead-out terminal, its inverting input receives reference voltage, its in-phase input end divides with former limit contact resistance with being coupled to the reference of former limit via the former edge of feedback component, to receive feedback voltage, its lead-out terminal produces error amplification signal; Clamper, is coupled between the lead-out terminal of error amplifier and reference ground; Frequency comparator, has in-phase input end, inverting input and lead-out terminal, and the lead-out terminal that its inverting input is coupled to error amplifier receives error amplification signal, and its lead-out terminal provides clock signal; Sawtooth generator, is coupled to the lead-out terminal receive clock signal of frequency comparator, and provides sawtooth signal to the in-phase input end of frequency comparator based on clock signal; Control and driving circuit, be coupled to the lead-out terminal receive clock signal of frequency comparator, and based on clock signal, produce switching drive signal, to control the break-make of former limit power switch;
Wherein said clamper comprises the second Zener diode;
Also comprise: compensation condenser, be coupled between the lead-out terminal of error amplifier and inverting input;
Described feedback component comprises photoelectrical coupler;
Described sawtooth generator comprises:
Charging current source, charging capacitor and reset switch, three's coupled in parallel at the in-phase input end of frequency comparator with reference between ground, wherein
Described reset switch comprises control terminal further, and described control terminal is coupled to the lead-out terminal receive clock signal of frequency comparator.
Alternatively, described numerical key group comprises 0 to 90 number of words.
Alternatively, described operating key group comprises multiplication key button, accumulation key button, zero key button and switch key button.
Alternatively, described article key group comprises m × n key button, and wherein, m and n is positive integer;
The invention has the beneficial effects as follows:
(1) power supply has very high conversion efficiency, the power supply only needing 1-2 to save dry cell can to realize system;
(2) substantially reduce the volume and weight of electronic scales, achieve portability design.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the perspective view of a kind of small-size electronic scale of the present invention embodiment;
Fig. 2 is the electrical block diagram of small-size electronic scale shown in Fig. 1;
Fig. 3 is the circuit diagram of power supply shown in Fig. 1.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the perspective view of a kind of small-size electronic scale of the present invention embodiment.As shown in Figure 1, small-size electronic scale 1 comprises the scale pan 2 and manipulator 3.Manipulator 3 comprises article key group 4, display screen 5, numerical key group 6 and operating key group 7.Article key group 4 comprises m × n key button, and wherein, m and n is positive integer.Before use, utilize numerical key group 6 and operating key group 7 to operate, in each key button in article key group 4, pre-enter article unit price.Then, on each key button, correspondingly stick the label with Item Title.Like this, in use, directly can press Item Title, it is weighed and calculates.In addition, manipulator 3 also comprises built-in power P (Fig. 1 is not shown).
When shop article is changed, certain key button in numerical key group 6 and operating key group 7 pairs of article key groups 4 can be utilized to change, can also to all key button reset alls.
Fig. 2 is the electrical block diagram of small-size electronic scale shown in Fig. 1.As shown in Figure 2, small-size electronic scale circuit C comprises and article key group 4, display screen 5, numerical key group 6 and the operating key group 7 corresponding to small-size electronic scale 1 shown in Fig. 1.In addition, small-size electronic scale electrical equipment C also comprises power supply P.Power supply P is connected to display screen 5 and operating key group 7 thinks that it provides working power.Operating key group 7 is connected to display screen 5 to control its display effect.In addition, operating key group 7 is also connected to article key group 4 and numerical key group 6 to control its operation.Numerical key group 6 is also connected to article key group 4 to input article key group and to change operation.
Fig. 3 is the circuit diagram of power supply in Fig. 1, and power supply P comprises: input port 101, receives input voltage vin; Output port 102, provides output voltage Vo; Rectification unit 103, is coupled to input port 101 and receives input voltage vin, produces commutating voltage; Transformer, comprise former limit winding 104-1 and vice-side winding 104-2, its limit, Central Plains winding 104-1 and vice-side winding 104-2 respectively has the first terminal and the second terminal, the first terminal of former limit winding 104-1 is coupled to rectification unit 103 and receives commutating voltage, and second terminal of vice-side winding 104-2 connects secondary side reference ground; Former limit power switch 105, is coupled between second terminal of former limit winding 104-1 and reference ground, former limit; Secondary side diode 106, is coupled between the first terminal of vice-side winding 104-2 and output port 102; Output capacitor 107, is coupled between output port 102 and secondary side reference ground; Feedback component, comprises secondary part 108-1 and former edge divides 108-2; Secondary contact resistance 109, first Zener diode 110 and former limit contact resistance 111, wherein the secondary part 108-1 of feedback component, secondary contact resistance 109 and the first Zener diode 110 are coupled in series between output port 102 and secondary side reference ground, produce feedback voltage Vfb to divide 108-2 in the former edge of feedback component; Error amplifier 112, there is in-phase input end, inverting input and lead-out terminal, its inverting input receives reference voltage Vref, its in-phase input end divides 108-2 and former limit contact resistance 111 to be coupled to former limit with reference to ground via the former edge of feedback component, to receive feedback voltage Vfb, its lead-out terminal produces error amplification signal Vc; Clamper 113, is coupled between the lead-out terminal of error amplifier 112 and reference ground; Frequency comparator 114, has in-phase input end, inverting input and lead-out terminal, and the lead-out terminal that its inverting input is coupled to error amplifier 112 receives error amplification signal Vc, and its lead-out terminal provides clock signal clk; Sawtooth generator 115, is coupled to the lead-out terminal receive clock signal CLK of frequency comparator 114, and provides sawtooth signal Vsw to the in-phase input end of frequency comparator 114 based on clock signal clk; Control and driving circuit 116, be coupled to the lead-out terminal receive clock signal of frequency comparator 114, and based on clock signal, produce switching drive signal, to control the break-make of former limit power switch 105.
Preferably, described sawtooth generator 115 comprises: charging current source 11, charging capacitor 12 and reset switch 13, three's coupled in parallel is at the in-phase input end of frequency comparator 114 with reference between ground, wherein said reset switch 13 comprises control terminal further, and described control terminal is coupled to the lead-out terminal receive clock signal CLK of frequency comparator 114.When clock signal clk is low level, reset switch 13 is disconnected, then charging current source 11 charges to charging capacitor 12, the voltage linear at charging capacitor 12 two ends increases, when it increases to the magnitude of voltage of the frequency reference signal Vfr of frequency comparator 114 inverting input, the clock signal clk that frequency comparator 114 exports becomes high level.Correspondingly, reset switch 13 is closed.So charging capacitor 12 is pulled to ground, the voltage at its two ends is reset to zero rapidly, and namely the voltage of frequency comparator 114 in-phase input end is reset to zero.Subsequently, clock signal clk becomes low level, reset switch 13 is disconnected, charging current source 11 restarts to charge to charging capacitor 12, until charging capacitor 12 both end voltage reaches the magnitude of voltage of the frequency reference signal Vfr of frequency comparator 114 inverting input again and shot clock signal CLK becomes high level.Sawtooth generator 115 and frequency comparator 114 work as previously mentioned again and again, thus produce periodically variable sawtooth signal Vsw and clock signal clk.The timing waveform schematic diagram of clock signal clk, sawtooth signal Vsw, frequency reference signal Vfr and output voltage Vo is see Fig. 3.
Preferably, described rectification unit 103 comprises the rectifier circuit be made up of four diodes.
Preferably, described feedback component comprises photoelectrical coupler.
Preferably, described clamper 113 comprises the second Zener diode, and has clamping voltage Vz
Preferably, described switch flyback switch circuit 100 also comprises: compensation condenser 117, between the lead-out terminal being coupled in error amplifier 112 and inverting input.
When power supply P normally runs, when clock signal clk exports high level signal, then to control and switching drive signal that driving circuit 116 exports controls power switch 105 conducting of former limit, input voltage vin via the former limit winding 104-1 of rectification unit 103, transformer and former limit power switch 105 to former limit with reference to ground.Former limit winding 104-1 starts stored energy.
When the load of power supply P is relatively heavier, output voltage Vo is relatively little, and feedback voltage Vfb is also relatively little.Now the difference of feedback voltage Vfb and reference voltage Vref is less, then error amplification signal Vc is smaller.Namely, under heavy condition, its magnitude of voltage of signal of frequency comparator 114 inverting input is less.Sawtooth signal Vsw comparatively early can reach its peak value, and makes clock signal clk be converted to high level earlier, reduces the cycle of clock signal clk, and also namely switching frequency is now higher.And along with the change of load, error amplification signal Vc changes lentamente, makes switching frequency also change slowly, as shown in Figure 3, under heavy condition, the cycle of clock signal clk is T2.
When the load of power supply P is relatively light, output voltage Vo is relatively large, and feedback voltage Vfb is also relatively large.Now the difference of feedback voltage Vfb and reference voltage Vref is comparatively large, then error amplification signal Vc is larger.Namely, under light condition, its magnitude of voltage of signal of frequency comparator 114 inverting input is larger.Sawtooth signal Vsw reaches its peak value more lately, and makes clock signal clk be converted to high level more lately, extends the cycle of clock signal clk, and also namely switching frequency is now lower.Now the difference of feedback voltage Vfb and reference voltage Vref is less, then error amplification signal Vc is smaller.When error amplification signal Vc increases to the clamping voltage Vz of clamper 113, error amplification signal Vc is clamped at clamping voltage Vz place.Now switching frequency reaches minimum value, thus the frequency avoiding switching frequency to enter people's ear can hearing, cause noise.
In one embodiment, numerical key group comprises digital button 0 ~ 9.
In another embodiment, operating key group comprises multiplication key button, accumulation key button, zero key button and switch key button.
Utilize the small-size electronic scale that the present invention proposes, power supply has very high conversion efficiency, and the power supply only needing 1-2 to save dry cell can to realize system, substantially reduces the volume and weight of electronic scales, achieve portability design.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a small-size electronic scale, is characterized in that, comprising:
The scale pan; And
Manipulator, described manipulator comprises:
Display screen, described display screen is connected to described power supply;
Operating key group, described operating key group is connected to described power supply and described display screen;
Article key group, described article key group is connected to described operating key group; And
Numerical key group, described numerical key group is connected to described operating key group and described article key group;
Power supply, comprising: input port, receives input voltage;
Output port, provides output voltage;
Rectification unit, is coupled to input port and receives input voltage, produce commutating voltage;
Transformer, comprises former limit winding and vice-side winding, and its limit, Central Plains winding and vice-side winding respectively have the first terminal and the second terminal, and the first terminal of former limit winding is coupled to rectification unit and receives commutating voltage, and the second terminal of vice-side winding connects secondary side reference ground;
Former limit power switch, is coupled between the second terminal of former limit winding and reference ground, former limit;
Secondary side diode, is coupled between the first terminal of vice-side winding and output port;
Output capacitor, is coupled between output port and secondary side reference ground;
Feedback component, comprises secondary part and former edge is divided;
Secondary contact resistance, the first Zener diode and former limit contact resistance, wherein the secondary part of feedback component, secondary contact resistance and the first Zener diode are coupled in series between output port and secondary side reference ground, divide generation feedback voltage with the former edge in feedback component;
Error amplifier, there is in-phase input end, inverting input and lead-out terminal, its inverting input receives reference voltage, its in-phase input end divides with former limit contact resistance with being coupled to the reference of former limit via the former edge of feedback component, to receive feedback voltage, its lead-out terminal produces error amplification signal;
Clamper, is coupled between the lead-out terminal of error amplifier and reference ground;
Frequency comparator, has in-phase input end, inverting input and lead-out terminal, and the lead-out terminal that its inverting input is coupled to error amplifier receives error amplification signal, and its lead-out terminal provides clock signal;
Sawtooth generator, is coupled to the lead-out terminal receive clock signal of frequency comparator, and provides sawtooth signal to the in-phase input end of frequency comparator based on clock signal;
Control and driving circuit, be coupled to the lead-out terminal receive clock signal of frequency comparator, and based on clock signal, produce switching drive signal, to control the break-make of former limit power switch;
Wherein said clamper comprises the second Zener diode;
Also comprise: compensation condenser, be coupled between the lead-out terminal of error amplifier and inverting input;
Described feedback component comprises photoelectrical coupler;
Described sawtooth generator comprises:
Charging current source, charging capacitor and reset switch, three's coupled in parallel at the in-phase input end of frequency comparator with reference between ground, wherein
Described reset switch comprises control terminal further, and described control terminal is coupled to the lead-out terminal receive clock signal of frequency comparator.
2. small-size electronic scale as claimed in claim 1, it is characterized in that, described numerical key group comprises 0 to 90 number of words.
3. small-size electronic scale as claimed in claim 1, is characterized in that, described operating key group comprises multiplication key button, accumulation key button, zero key button and switch key button.
4. small-size electronic scale as claimed in claim 1, it is characterized in that, described article key group comprises m × n key button, and wherein, m and n is positive integer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510967540.1A CN105403302A (en) | 2015-12-20 | 2015-12-20 | Small electronic scale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510967540.1A CN105403302A (en) | 2015-12-20 | 2015-12-20 | Small electronic scale |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105403302A true CN105403302A (en) | 2016-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510967540.1A Pending CN105403302A (en) | 2015-12-20 | 2015-12-20 | Small electronic scale |
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| Country | Link |
|---|---|
| CN (1) | CN105403302A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109282887A (en) * | 2017-07-21 | 2019-01-29 | 长沙恒凯电子科技有限公司 | Electronic scale |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101701843A (en) * | 2009-11-13 | 2010-05-05 | 中国农业大学 | Dynamic electronic scale for loader |
| CN101943597A (en) * | 2010-04-30 | 2011-01-12 | 中山市永衡日用制品有限公司 | Novel electronic scale |
| CN103051216A (en) * | 2012-12-12 | 2013-04-17 | 青岛联盟电子仪器有限公司 | Flyback-type switch circuit |
| CN103076075A (en) * | 2012-12-12 | 2013-05-01 | 青岛联盟电子仪器有限公司 | Electronic balance |
| JP2015152970A (en) * | 2014-02-10 | 2015-08-24 | 東芝テック株式会社 | Electronic apparatus and program |
-
2015
- 2015-12-20 CN CN201510967540.1A patent/CN105403302A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101701843A (en) * | 2009-11-13 | 2010-05-05 | 中国农业大学 | Dynamic electronic scale for loader |
| CN101943597A (en) * | 2010-04-30 | 2011-01-12 | 中山市永衡日用制品有限公司 | Novel electronic scale |
| CN103051216A (en) * | 2012-12-12 | 2013-04-17 | 青岛联盟电子仪器有限公司 | Flyback-type switch circuit |
| CN103076075A (en) * | 2012-12-12 | 2013-05-01 | 青岛联盟电子仪器有限公司 | Electronic balance |
| JP2015152970A (en) * | 2014-02-10 | 2015-08-24 | 東芝テック株式会社 | Electronic apparatus and program |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109282887A (en) * | 2017-07-21 | 2019-01-29 | 长沙恒凯电子科技有限公司 | Electronic scale |
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Application publication date: 20160316 |
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