CN102944851A - Power supply performance measuring device for communication module of intelligent electric energy meter - Google Patents

Abstract

The invention relates to the technical field of power supply performance measuring devices for communication modules of intelligent electric energy meters, in particular to a device for measuring the power supply output voltage and output power of a communication module of the intelligent electric energy meter. The device comprises an intelligent electric energy meter communication module, a resistor, a digital display voltmeter and electric switches, wherein the resistor R is connected in parallel with the digital display voltmeter after being connected in series with the electric switch K2, then connected in series with the electric switch K1, and finally connected in parallel with a tested power supply through an electric interface. The device is perfect in design principle, simple in experimental wiring and fast and convenient in detection, the tested result reflects the real maximum output power of the tested power supply, and the device is suitable for detection and evaluation of power supplies of large-batch intelligent electric energy meter communication modules.

Description

Intelligent electric energy meter communication module power supply device for measuring properties

Affiliated technical field

The present invention relates to the technical field of intelligent electric energy meter communication module power supply device for measuring properties, the measurement mechanism of especially a kind of intelligent electric energy meter communication module power supply output voltage and output power.

Background technology

It is more and more universal that the application in the electrical network is joined, used to intelligent electric energy meter in intelligence in recent years.Intelligent electric energy meter communicates by carrier module and low pressure centralized automatic meter-reading device usually, and its carrier communication module power supply is provided by intelligent electric energy meter.Can the output voltage of power supply, power meet the demands and directly determine the height of intelligent electric energy meter communication reliability.

The correlation technique standard proposes to explicitly call for to intelligent electric energy meter communication module power supply performance index at present, but does not provide concrete measuring method and measurement mechanism in the standard.Generally speaking, the output voltage of the resistance measurement intelligent electric energy meter communication module power supply that this test can be by external fixed resistance value calculates its realtime power, and judges accordingly whether the power supply performance index meet the demands.But the method has the following disadvantages:

(1) the non-power supply peak power output of test gained power, experimental result can not reflect the performance of intelligent electric energy meter communication module power supply comprehensively;

(2) experimental wiring is loaded down with trivial details, and testing efficiency is low;

(3) proving installation is the occasional combination device, is not suitable for the detection assessment of intelligent electric energy meter communication module power supply in enormous quantities.

Summary of the invention

In order to solve the above-mentioned technical matters that exists in the prior art, the invention provides a kind of intelligent electric energy meter communication module power supply device for measuring properties, this device can not only correctly record the peak power output of intelligent electric energy meter communication module power supply, and test process is simple, is fit to the detection assessment of intelligent electric energy meter communication module power supply in enormous quantities.

The technical solution adopted for the present invention to solve the technical problems is:

Intelligent electric energy meter communication module power supply device for measuring properties comprises intelligent electric energy meter communication module, resistance, digital display voltmeter and electrical equipment beginning; Resistance R and electric switch K ₂After the series connection, in parallel with digital display voltmeter again, and then series connection electrical equipment K switch ₁, in parallel with tested power supply by electric interfaces.

It is 1 grade resistance that described resistance R is chosen precision, and resistance must be chosen according to the output requirement of the power supply of surveying, and power is greater than 1-2 times of the power supply output power of surveying.

The precision of described digital display voltmeter is 1 grade, range 20V, and input impedance is greater than 10M Ω.

Described electric interfaces adopts 2 * 6 double contact pins as web member, and pin 6-7 is and the power supply of intelligent electric energy meter interface that all the other pins are the sky pin.

The measuring method of intelligent electric energy meter communication module power supply device for measuring properties is:

(1) in the situation of intelligent electric energy meter outage, carrier module is extracted, the electric interfaces contact pin insertion intelligent electric energy meter power supply interface with this device places off-state with two switches;

(2) power supply of connection intelligent electric energy meter, turn on-switch K ₁, read the reading of voltage table, be designated as U ₁

(3) turn on-switch K ₂, read the reading of voltage table, be designated as U ₂

(4) calculate the internal resistance of power supply according to formula (1);

$r=\frac{(U_1-U_2)R}{U_2}---\left(1\right)$

(5) calculate the peak power output of this intelligent electric energy meter communication module power supply according to formula (2);

$P_{\max }=\frac{U_1}{4r}---\left(2\right)$

(6) if P _Max＜P ₀, then power supply is defective, otherwise forwards next step 7 to;

(7) obtain output power greater than P according to formula (3) ₀Standard resistance range R ∈ [R ₁, R ₂];

$\frac{{U_1}^2}{R+\frac{r^2}{R}+2r}=P_0---\left(3\right)$

(8) by the electric resistance partial pressure principle as can be known:

$\frac{U_x}{U_1}=\frac{R}{R+r}---\left(4\right)$

U wherein _x∈ [U _Min, U _Max], can try to achieve output voltage at [U _Min, U _Max] between Standard resistance range R ∈ [R ₃, R ₄];

(9) if [R ₁, R ₂] ∩ [R ₃, R ₄]=Φ, then the power supply of surveying undesirable; Otherwise the power supply of surveying meets the requirements, and draws experiment conclusion;

(10) experiment conclusion: if P _Max＜P ₀, or [R ₁, R ₂] ∩ [R ₃, R ₄]=Φ, then the power supply of surveying defective; If P _Max〉=P ₀And [R ₁, R ₂] ∩ [R ₃, R ₄] ≠ Φ, it is qualified then to survey intelligent electric energy meter communication module power supply output voltage and output power, and as communication module resistance R ∈ [max (R ₁, R ₃), min (R ₂, R ₄)] time, the intelligent electric energy meter communication module power supply output voltage of surveying at [U _Min, U _Max] in the scope, output power is at [P ₀, P _Max] in the scope.

Described output voltage is at [U _Min, U _Max] in the scope, output power is greater than P ₀This power supply can equivalence be a voltage source, and its voltage is U ₀, internal resistance is r, the communication module resistance is R.

The power of described intelligent electric energy meter communication module consumption is:

$P=I^{2}R={\left(\frac{U_0}{R+r}\right)}^{2}R=\frac{{U_0}^2}{R+\frac{r^2}{R}+2r}---\left(\text{1}\right)$

When ${{(R+\frac{r^2}{R}+2r)}_R}^{\′}=0$ The time, $(R+\frac{r^2}{R}+2r)$ Obtain minimal value, then P obtains maximum value, i.e. maximal value; At this moment, R=r is arranged, namely when the communication module resistance equaled the internal resistance resistance, communication module obtained peak power

If P _Max＜P ₀, then the power supply of surveying defective; If P _Max〉=P ₀, can try to achieve output power greater than P ₀The communication module Standard resistance range be [R ₁, R ₂], output power range is at [P in this Standard resistance range ₀, P _Max] in;

By electric resistance partial pressure principle U/U as can be known ₀=R/ (R+r), and U ∈ [U _Min, U _Max], can try to achieve the communication module Standard resistance range that satisfies this output voltage range is [R ₃, R ₄];

If [R ₁, R ₂] ∩ [R ₃, R ₄]=Φ, it is defective then to survey intelligent electric energy meter communication module power supply; If [R ₁, R ₂] ∩ [R ₃, R ₄] ≠ Φ, then the power supply of surveying qualified; At this moment, when the communication module resistance at [max (R ₁, R ₃), min (R ₂, R ₄)] when scope was interior, power supply satisfied output voltage at [U _Min, U _Max] between, output power is greater than P ₀Requirement.

The invention has the beneficial effects as follows: design concept is correctly perfect, and experimental wiring is simple, and testing process is convenient, and measured result reflects the true peak power output of tested power supply, is fit to the detection assessment of intelligent electric energy meter communication module power supply in enormous quantities.

Description of drawings

Fig. 1 is circuit theory diagrams of the present invention;

Fig. 2 is the electric interfaces pin Pareto diagram of the present invention and intelligent electric energy meter.

Embodiment

The present invention is a kind of intelligent electric energy meter communication module power supply device for measuring properties.Comprise a circuit of measuring the power supply peak power output, totally five elements and some wires form this circuit by a resistance, digital display voltmeter, two electric switches, electric interfaces.

In Fig. 1, electric switch K of resistance R series connection ₂After, in parallel with digital display voltmeter again, then by electric switch K of series connection ₁, in parallel with tested power supply by electric interfaces.It is 1 grade resistance that resistance R is chosen precision, and resistance must be chosen according to the output requirement of the power supply of surveying, and power is greater than 1-2 times of the power supply output power of surveying.1 grade of the precision of digital display voltmeter, range 20V, input impedance is greater than 10M Ω.As shown in Figure 2, Fig. 2 is the electric interfaces pin Pareto diagram of proving installation and intelligent electric energy meter, adopts 2 * 6 double contact pins as web member, and pin 6,7 is and the power supply of intelligent electric energy meter interface that all the other pins are the sky pin.

The technical requirement of intelligent electric energy meter communication module power supply is: output voltage is at [U _Min, U _Max] in the scope, output power is greater than P ₀This power supply can equivalence be a voltage source, and its voltage is U ₀, internal resistance is r, the communication module resistance is R.

The power of communication module consumption is:

$P=I^{2}R={\left(\frac{U_0}{R+r}\right)}^{2}R=\frac{{U_0}^2}{R+\frac{r^2}{R}+2r}---\left(\text{1}\right)$

When ${{(R+\frac{r^2}{R}+2r)}_R}^{\′}=0$ The time, $(R+\frac{r^2}{R}+2r)$ Obtain minimal value, then P obtains maximum value, i.e. maximal value.At this moment, R=r is arranged, namely when the communication module resistance equaled the internal resistance resistance, communication module obtained peak power If P _Max＜P ₀, then the power supply of surveying defective; If P _Max〉=P ₀, can try to achieve output power greater than P ₀The communication module Standard resistance range be [R ₁, R ₂], output power range is at [P in this Standard resistance range ₀, P _Max] in.

By electric resistance partial pressure principle U/U as can be known ₀=R/ (R+r), and U ∈ [U _Min, U _Max], can try to achieve the communication module Standard resistance range that satisfies this output voltage range is [R ₃, R ₄].

If [R ₁, R ₂] ∩ [R ₃, R ₄]=Φ, it is defective then to survey intelligent electric energy meter communication module power supply; If [R ₁, R ₂] ∩ [R ₃, R ₄] ≠ Φ, it is qualified then to survey power supply.At this moment, when the communication module resistance at [max (R ₁, R ₃), min (R ₂, R ₄)] when scope was interior, power supply satisfied output voltage at [U _Min, U _Max] between, output power is greater than P ₀Requirement.

By top theoretical analysis as can be known: according to given technical requirement, just can calculate and judge whether the intelligent electric energy meter communication module power supply of surveying meets the demands as long as record internal resistance and the no-load voltage of power supply.

Use the operation steps of this device detection intelligent electric energy meter communication module power supply output power as follows:

1. in the situation of intelligent electric energy meter outage, carrier module is extracted, the electric interfaces contact pin insertion intelligent electric energy meter power supply interface with this device places off-state with two switches;

2. connect the power supply of intelligent electric energy meter, turn on-switch K ₁, read the reading of voltage table, be designated as U ₁

3. turn on-switch K ₂, read the reading of voltage table, be designated as U ₂

4. calculate the internal resistance of power supply according to formula (1);

$r=\frac{(U_1-U_2)R}{U_2}---\left(1\right)$

5. calculate the peak power output of this intelligent electric energy meter communication module power supply according to formula (2);

$P_{\max }=\frac{U_1}{4r}---\left(2\right)$

6. if P _Max＜P ₀, then power supply is defective.Otherwise forward 7 to;

7. obtain output power greater than P according to formula (3) ₀Standard resistance range R ∈ [R ₁, R ₂];

$\frac{{U_1}^2}{R+\frac{r^2}{R}+2r}=P_0---\left(3\right)$

8. by the electric resistance partial pressure principle as can be known:

$\frac{U_x}{U_1}=\frac{R}{R+r}---\left(4\right)$

U wherein _x∈ [U _Min, U _Max], can try to achieve output voltage at [U _Min, U _Max] between Standard resistance range R ∈ [R ₃, R ₄].

9. if [R ₁, R ₂] ∩ [R ₃, R ₄]=Ф, then the power supply of surveying undesirable; Otherwise the power supply of surveying meets the requirements, and draws experiment conclusion;

10. experiment conclusion: if P _Max＜P ₀, or [R ₁, R ₂] ∩ [R ₃, R ₄]=Φ, then the power supply of surveying defective; If P _Max〉=P ₀And [R ₁, R ₂] ∩ [R ₃, R ₄] ≠ Φ, it is qualified then to survey intelligent electric energy meter communication module power supply output voltage and output power, and as communication module resistance R ∈ [max (R ₁, R ₃), min (R ₂, R ₄)] time, the intelligent electric energy meter communication module power supply output voltage of surveying at [U _Min, U _Max] in the scope, output power is at [P ₀, P _Max] in the scope.

Experimental wiring of the present invention is simple, can measure quantitatively intelligent electric energy meter communication module power supply peak power output according to given technical requirement, can further judge accordingly its whether requirement up to specification of output.

Claims (7)

1. intelligent electric energy meter communication module power supply device for measuring properties comprises intelligent electric energy meter communication module, resistance, digital display voltmeter and electrical equipment beginning; It is characterized in that: resistance R and electric switch K ₂After the series connection, in parallel with digital display voltmeter again, and then series connection electrical equipment K switch ₁, in parallel with tested power supply by electric interfaces.

2. intelligent electric energy meter communication module power supply device for measuring properties according to claim 1, it is characterized in that: it is 1 grade resistance that described resistance R is chosen precision, resistance must require according to the output of the power supply of surveying to choose, and power is greater than 1-2 times of the power supply output power of surveying.

3. intelligent electric energy meter communication module power supply device for measuring properties according to claim 1, it is characterized in that: the precision of described digital display voltmeter is 1 grade, range 20V, input impedance is greater than 10M Ω.

4. intelligent electric energy meter communication module power supply device for measuring properties according to claim 1, it is characterized in that: described electric interfaces adopts 2 * 6 double contact pins as web member, pin 6-7 is and the power supply of intelligent electric energy meter interface that all the other pins are the sky pin.

5. the measuring method of intelligent electric energy meter communication module power supply device for measuring properties according to claim 1 is characterized in that:

(1) in the situation of intelligent electric energy meter outage, carrier module is extracted, the electric interfaces contact pin insertion intelligent electric energy meter power supply interface with this device places off-state with two switches;

(2) power supply of connection intelligent electric energy meter, turn on-switch K ₁, read the reading of voltage table, be designated as U _1;

(3) turn on-switch K ₂, read the reading of voltage table, be designated as U ₂

(4) calculate the internal resistance of power supply according to formula (1);

$r=\frac{(U_1-U_2)R}{U_2}---\left(1\right)$

(5) calculate the peak power output of this intelligent electric energy meter communication module power supply according to formula (2);

$P_{\max }=\frac{U_1}{4r}---\left(2\right)$

(6) if P _Max＜P ₀, then power supply is defective, otherwise forwards next step 7 to;

(7) obtain output power greater than P according to formula (3) ₀Standard resistance range R ∈ [R ₁, R ₂];

$\frac{{U_1}^2}{R+\frac{r^2}{R}+2r}=P_0---\left(3\right)$

(8) by the electric resistance partial pressure principle as can be known:

$\frac{U_x}{U_1}=\frac{R}{R+r}---\left(4\right)$

U wherein _x∈ [U _Min, U _Max], can try to achieve output voltage at [U _Min, U _Max] between Standard resistance range R ∈ [R ₃, R ₄];

(9) if [R ₁, R ₂] ∩ [R ₃, R ₄]=Φ, then the power supply of surveying undesirable; Otherwise the power supply of surveying meets the requirements, and draws experiment conclusion;

(10) experiment conclusion: if P _Max＜P ₀, or [R ₁, R ₂] ∩ [R ₃, R ₄]=Φ, then the power supply of surveying defective; If P _Max〉=P ₀And [R ₁, R ₂] ∩ [R ₃, R ₄] ≠ Φ, it is qualified then to survey intelligent electric energy meter communication module power supply output voltage and output power, and as communication module resistance R ∈ [max (R ₁, R ₃), min (R ₂, R ₄)] time, the intelligent electric energy meter communication module power supply output voltage of surveying at [U _Min, U _Max] in the scope, output power is at [P ₀, P _Max] in the scope.

6. the measuring method of intelligent electric energy meter communication module power supply device for measuring properties according to claim 5, it is characterized in that: described output voltage is at [U _Min, U _Max] in the scope, output power is greater than P ₀This power supply can equivalence be a voltage source, and its voltage is U ₀, internal resistance is r, the communication module resistance is R.

7. the measuring method of intelligent electric energy meter communication module power supply device for measuring properties according to claim 5, it is characterized in that: the power of described intelligent electric energy meter communication module consumption is:

$P=I^{2}R={\left(\frac{U_0}{R+r}\right)}^{2}R=\frac{{U_0}^2}{R+\frac{r^2}{R}+2r}---\left(\text{1}\right)$

When ${{(R+\frac{r^2}{R}+2r)}_R}^{\′}=0$ The time, $(R+\frac{r^2}{R}+2r)$ Obtain minimal value, then P obtains maximum value, i.e. maximal value; At this moment, R=r is arranged, namely when the communication module resistance equaled the internal resistance resistance, communication module obtained peak power

If P _Max＜P ₀, then the power supply of surveying defective; If P _Max〉=P ₀, can try to achieve output power greater than P ₀The communication module Standard resistance range be [R ₁, R ₂], output power range is at [P in this Standard resistance range ₀, P _Max] in;

By electric resistance partial pressure principle U/U as can be known ₀=R/ (R+r), and U ∈ [U _Min, U _Max], can try to achieve the communication module Standard resistance range that satisfies this output voltage range is [R ₃, R ₄];

If [R ₁, R ₂] ∩ [R ₃, R ₄]=Φ, it is defective then to survey intelligent electric energy meter communication module power supply; If [R ₁, R ₂] ∩ [R ₃, R ₄] ≠ Φ, then the power supply of surveying qualified; At this moment, when the communication module resistance at [max (R ₁, R ₃), min (R ₂, R ₄)] when scope was interior, power supply satisfied output voltage at [U _Min, U _Max] between, output power is greater than P ₀Requirement.

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