CN203216959U - Floating digital display meter power supply structure - Google Patents
Floating digital display meter power supply structure Download PDFInfo
- Publication number
- CN203216959U CN203216959U CN 201320255149 CN201320255149U CN203216959U CN 203216959 U CN203216959 U CN 203216959U CN 201320255149 CN201320255149 CN 201320255149 CN 201320255149 U CN201320255149 U CN 201320255149U CN 203216959 U CN203216959 U CN 203216959U
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- CN
- China
- Prior art keywords
- digital display
- power supply
- gauge outfit
- voltage
- operational amplifier
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- 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.)
- Expired - Lifetime
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Abstract
The utility model relates to a floating digital display meter power supply structure. The floating digital display meter power supply structure includes a digital display meter, a power source chip IC, a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a potentiometer VT1, an operational amplifier IC1, a feedback resistor R3, a power triode Q1 and a three-terminal voltage-stabilizing IC2. According to the circuit of the floating digital display meter power supply structure, the first voltage-dividing resistor R1, the potentiometer VT1 and the second voltage-dividing resistor R2 form a voltage-dividing circuit which enables sampling signals for the digital display meter and at the same time, provides pulse control for the power source chip IC; and single semiconductor pieces such as a triode and a diode are not adopted in a sampling loop, instead, the operational amplifier with a temperature compensation function is adopted. The floating digital display meter power supply structure is advantageous in low cost and stable display of the meter, and is not affected by temperature.
Description
Technical field:
The utility model relates to digital display meter header territory, and particularly a kind of electric welding machine is with floating ground digital display gauge outfit electric power-feeding structure.
Background technology:
For demonstration directly perceived, increasing electric welding machine uses the digital display gauge outfit, the electric welding machine digital display gauge outfit that can purchase on the market at present, a kind of be the gauge outfit power supply with sample of signal altogether, another be gauge outfit power and sample of signal not altogether, i.e. isolation use.A kind of gauge outfit in back so price is comparatively expensive, is the several times of common ground gauge outfit price owing to need make Current Transformer obtain sampled signal.As electric welding machine industry with keen competition, under the prerequisite of guaranteed performance, save cost and become trend, therefore save cost in order to reach performance, adopt gauge outfit altogether at present mostly, but because power supply chip PWM adjustable side, need provide the above value ability of 1V output waveform, and digital display gauge outfit range ability is 0-1V.When providing for power supply chip IC to be worth more than the 1V, power supply chip IC exports pulse, this moment, gauge outfit was to show maximal value, in circuit during semiconductor devices such as series connection general-purpose diode or voltage stabilizing diode, owing to do not have temperature correction, when temperature variation, owing to partly lead the not temperature characterisitic of PN junction, cause the digital display gauge outfit when hot environment and low temperature environment use, numerical value change is bigger, influences result of use.
The utility model content:
The purpose of this utility model is to overcome the deficiency of above-mentioned prior art, provides a kind of cost-saved, and the gauge outfit demonstration is stable, not the floating ground digital display gauge outfit electric power-feeding structure of temperature influence.
The purpose of this utility model is achieved through the following technical solutions:
A kind of floating ground digital display gauge outfit electric power-feeding structure, comprise the digital display gauge outfit, power supply chip IC, the first divider resistance R1, the second divider resistance R2, potentiometer VT1, operational amplifier IC1, feedback resistance R3, pliotron Q1 and three-terminal voltage-stabilizing module I C2, wherein, described potentiometer VT1 one end is connected with the PWM adjustable side of power supply chip IC and the sampling end A1 of digital display gauge outfit respectively, described potentiometer VT1 is connected with the second divider resistance R2 with the first divider resistance R1 respectively at two ends in addition, the positive input A2 of described operational amplifier IC1 is connected between potentiometer VT1 and the second divider resistance R2, the negative input A4 of described operational amplifier IC1 is connected with the power supply negative pole C1 of digital display gauge outfit through feedback resistance R3, the output terminals A 3 of described operational amplifier IC1 is connected with the B utmost point of pliotron Q1, the E utmost point of described pliotron Q1 is connected with the power supply negative pole C1 of digital display gauge outfit and the grounding ports GND of three-terminal voltage-stabilizing module I C2 respectively, the C utmost point ground connection of described pliotron Q1, the voltage input end mouth Vin of described three-terminal voltage-stabilizing module I C2 is connected with the power input VCC of operational amplifier IC1, and the voltage output end mouth Vout of described three-terminal voltage-stabilizing module I C2 is connected with the anodal B1 of the power supply of digital display gauge outfit.
The described first divider resistance R1 is connected with reference voltage, the described second divider resistance ground connection.
The beneficial effects of the utility model are:
On the one hand, gauge outfit power supply and sample of signal common ground, in the circuit, the potential difference (PD) between A1 and A2 is the needed sampled signal of gauge outfit, need not to make Current Transformer, thereby has saved cost, has also guaranteed the gauge outfit performance simultaneously.
On the other hand, in circuit, sampling loop does not use triode, the single semiconductor devices of diode and so on, and used the operational amplifier that has temperature compensation, namely when temperature changed, operational amplifier self had temperature compensation function, output is unlikely is subjected to Temperature Influence, and it is more stable that gauge outfit is shown.When even if temperature variation changes A2 point current potential a little, under the adjustment of devices such as three-terminal voltage-stabilizing module, also can make power supply stable, be unlikely the demonstration that influences gauge outfit.
Description of drawings:
Fig. 1 is floating ground of the utility model digital display gauge outfit electric power-feeding structure synoptic diagram.
Embodiment:
As shown in Figure 1, the described a kind of floating ground of present embodiment digital display gauge outfit electric power-feeding structure comprises digital display gauge outfit, power supply chip IC, the first divider resistance R1, the second divider resistance R2, potentiometer VT1, operational amplifier IC1, feedback resistance R3, pliotron Q1 and three-terminal voltage-stabilizing module I C2.Wherein, potentiometer VT1 one end is connected with the PWM adjustable side of power supply chip IC and the sampling end A1 of digital display gauge outfit respectively, potentiometer VT1 is connected with the second divider resistance R2 with the first divider resistance R1 respectively at two ends in addition, and the first divider resistance R1 is connected with reference voltage, the second divider resistance ground connection; The positive input A2 of operational amplifier IC1 is connected between potentiometer VT1 and the second divider resistance R2, the negative input A4 of operational amplifier IC1 is connected with the power supply negative pole C1 of digital display gauge outfit through feedback resistance R3, the output terminals A 3 of operational amplifier IC1 is connected with the B utmost point of pliotron Q1, the E utmost point of pliotron Q1 is connected with the power supply negative pole C1 of digital display gauge outfit and the grounding ports GND of three-terminal voltage-stabilizing module I C2 respectively, the C utmost point ground connection of pliotron Q1, the voltage input end mouth Vin of three-terminal voltage-stabilizing module I C2 is connected with the power input VCC of operational amplifier IC1, and the voltage output end mouth Vout of three-terminal voltage-stabilizing module I C2 is connected with the anodal B1 of the power supply of digital display gauge outfit.
Its principle of work is as follows:
Potential difference (PD) among the figure between A1 and A2 is the needed sampled signal of digital display gauge outfit, B1 and C1 are the digital display feeder ear, A1 and C1 are digital display gauge outfit sample of signal end, digital display gauge outfit sampled signal is potential difference (PD) between A1 and A2, potential change between A1 and A2, namely change digital display gauge outfit sampling value, and change digital display gauge outfit displayed value.
The first divider resistance R1, potentiometer VT1, the second divider resistance R2 form bleeder circuit, give digital display gauge outfit sampled signal, provide pulse control for power supply chip IC simultaneously, regulator potentiometer VT1 namely changes the potential difference (PD) between A1 and A2, just can change digital display gauge outfit sampled signal value, operational amplifier IC1, feedback resistance R3, pliotron Q1 form voltage follower in the circuit, and namely the C1 current potential changes along with the A2 potential change, and C1 and A2 are same equipotential.This circuit computing amplifier IC1 normal phase input end input signal, R3 is feedback resistance, Q1 is pliotron, increase the output current ability, by the amplifier principle, R3 is feedback resistance, operational amplifier IC1 normal phase input end and reverse input end can constitute " empty short ", be normal phase input end and reverse input end equipotential, because operational amplifier IC1 input resistance infinity, namely feedback resistance R3 no current flows through, R3 two terminal potentials equate, be that C1 equals operational amplifier IC1 reverse input end voltage, and operational amplifier IC1 reverse input end equals the A2 current potential, namely A2 equates with the C1 current potential.IC2 is three-terminal regulator block, and namely the potential difference (PD) of B1 and C1 is the three-terminal regulator block nominal value, power supply is provided for the digital display gauge outfit.
Above-described embodiment is only for the usefulness that the utility model is described; and be not to restriction of the present utility model; the those of ordinary skill in relevant technologies field; under the situation that does not break away from spirit and scope of the present utility model; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present utility model, and scope of patent protection of the present utility model should be limited by each claim.
Claims (2)
1. one kind is floated ground digital display gauge outfit electric power-feeding structure, comprise the digital display gauge outfit, power supply chip IC, it is characterized in that: also comprise the first divider resistance R1, the second divider resistance R2, potentiometer VT1, operational amplifier IC1, feedback resistance R3, pliotron Q1 and three-terminal voltage-stabilizing module I C2, wherein, described potentiometer VT1 one end is connected with the PWM adjustable side of power supply chip IC and the sampling end A1 of digital display gauge outfit respectively, described potentiometer VT1 is connected with the second divider resistance R2 with the first divider resistance R1 respectively at two ends in addition, the positive input A2 of described operational amplifier IC1 is connected between potentiometer VT1 and the second divider resistance R2, the negative input A4 of described operational amplifier IC1 is connected with the power supply negative pole C1 of digital display gauge outfit through feedback resistance R3, the output terminals A 3 of described operational amplifier IC1 is connected with the B utmost point of pliotron Q1, the E utmost point of described pliotron Q1 is connected with the power supply negative pole C1 of digital display gauge outfit and the grounding ports GND of three-terminal voltage-stabilizing module I C2 respectively, the C utmost point ground connection of described pliotron Q1, the voltage input end mouth Vin of described three-terminal voltage-stabilizing module I C2 is connected with the power input VCC of operational amplifier IC1, and the voltage output end mouth Vout of described three-terminal voltage-stabilizing module I C2 is connected with the anodal B1 of the power supply of digital display gauge outfit.
2. a kind of floating ground as claimed in claim 1 digital display gauge outfit electric power-feeding structure, it is characterized in that: the described first divider resistance R1 is connected with reference voltage, the described second divider resistance ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320255149 CN203216959U (en) | 2013-04-25 | 2013-04-25 | Floating digital display meter power supply structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320255149 CN203216959U (en) | 2013-04-25 | 2013-04-25 | Floating digital display meter power supply structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203216959U true CN203216959U (en) | 2013-09-25 |
Family
ID=49206484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320255149 Expired - Lifetime CN203216959U (en) | 2013-04-25 | 2013-04-25 | Floating digital display meter power supply structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203216959U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135155A (en) * | 2014-08-13 | 2014-11-05 | 永康市帝普特科技有限公司 | Pulse width limiting circuit of inverter |
| CN104198783A (en) * | 2014-09-19 | 2014-12-10 | 杭州士兰微电子股份有限公司 | Power detection circuit with temperature compensation characteristic and powered device |
| CN104767517A (en) * | 2015-04-10 | 2015-07-08 | 乐山一拉得电网自动化有限公司 | Data display instrument analog quantity output circuit |
-
2013
- 2013-04-25 CN CN 201320255149 patent/CN203216959U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135155A (en) * | 2014-08-13 | 2014-11-05 | 永康市帝普特科技有限公司 | Pulse width limiting circuit of inverter |
| CN104198783A (en) * | 2014-09-19 | 2014-12-10 | 杭州士兰微电子股份有限公司 | Power detection circuit with temperature compensation characteristic and powered device |
| CN104198783B (en) * | 2014-09-19 | 2017-08-25 | 杭州士兰微电子股份有限公司 | Power sense circuit and power receiving equipment with temperature compensation characteristic |
| CN104767517A (en) * | 2015-04-10 | 2015-07-08 | 乐山一拉得电网自动化有限公司 | Data display instrument analog quantity output circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130925 |