CN110726951B - Method for detecting connection state of power supply far-end voltage compensation end - Google Patents
Method for detecting connection state of power supply far-end voltage compensation end Download PDFInfo
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Abstract
The invention provides a method for detecting the connection state of a power supply far-end voltage compensation end, which comprises the following steps: a hardware detection resistance branch is added in the power output end remote voltage sampling circuit, and the connection state of the current far-end compensation terminals S + and S-is detected in real time by judging the comparison between the output voltage of the power output end remote voltage sampling circuit and the theoretical expected value voltage. By adopting the technical scheme of the invention, fault reporting can be carried out in time, and the test site is maintained to safely realize reliable test. The added hardware circuit is simple and convenient, has low cost, and the judgment method is simple and reliable and can be directly applied to actual engineering; the method is not only suitable for power supply application occasions with the output end voltage differential sampling circuit, but also can be applied to any power supply equipment with the output end voltage sampling circuit with the compensation connecting terminal.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a method for detecting the connection state of a remote voltage compensation end of a power supply.
Background
The basic performance required by the direct-current power supply in an industrial application environment or a nonlinear special direct-current power supply is that the corresponding output has good voltage sampling precision under any working condition, and the output precision is a key technical index for evaluating the high-power direct-current power supply. In an actual test environment of the high-power supply, the longer connecting cable between the power supply and the power supply load can seriously affect the voltage precision of power supply output under the condition of high-power output of the power supply, so that the mode of a compensation connecting wire is generally adopted to carry out remote compensation on the output voltage of the power supply.
In general power supply equipment, two compensation connecting wires S + and S-are additionally added at an output end so that a user can be connected to an input port of actual tested equipment, and therefore far-end voltage compensation is performed, a power voltage value sent to a tested load input interface is improved, and the output voltage precision of a high-power direct-current power supply is improved. And the test field cable connection is manual connection, complex uncontrollable factors exist, and the correct connection of the compensation terminals S + and S-of the power supply equipment cannot be ensured. At present, the high-power direct-current power supply equipment with the remote voltage compensation terminal does not have a simple and effective measure for detecting the connection state of the compensation terminals S + and S-of the output end in real time, the corresponding compensation connecting line is disconnected while the power is output, the power supply still has power output, and the power supply cannot be shut down for protection. Therefore, the direct current power supply needs a simple detection scheme, and the current connection states of the compensation terminal connecting wires S + and S-of the power supply equipment are judged in real time, the fault connection mode is eliminated, and the normal power output of the power supply equipment is ensured.
However, in the prior art, the high-power dc power supply device with the remote voltage compensation terminal does not have a simple and effective measure to detect the connection state of the compensation terminals S + and S-at the output end in real time, and the corresponding compensation connection line is disconnected while the power is output, so that the power supply still has power output, and cannot be protected by shutdown, and the real-time connection state of the remote voltage compensation terminal of the power supply cannot be realized, thereby causing a test problem caused by uncertainty of manual connection of cables in a test site.
Disclosure of Invention
Aiming at the technical problems, the invention discloses a method for detecting the connection state of a power supply far-end voltage compensation end, which can conveniently detect the connection state of the current far-end compensation terminals S + and S-in real time and timely report faults.
In contrast, the technical scheme adopted by the invention is as follows:
a method for detecting the connection state of a far-end voltage compensation end of a power supply comprises the following steps: a hardware detection resistance branch is added in the power output end remote voltage sampling circuit, and the connection state of the current far-end compensation terminals S + and S-is detected in real time by judging the comparison between the output voltage of the power output end remote voltage sampling circuit and the theoretical expected value voltage.
As a further improvement of the present invention, the power output end remote voltage sampling circuit includes an operational amplifier OPA, a resistor R1, a resistor R2, a resistor R3, and a resistor R4, the remote compensation terminal S + is connected to the non-inverting input end of the operational amplifier OPA through the resistor R1, and the non-inverting input end of the operational amplifier OPA is grounded through the resistor R2; the remote compensation terminal S-is connected to the inverting input of the operational amplifier OPA through a resistor R3, and the inverting input of the operational amplifier OPA is connected to the output of the operational amplifier OPA through a resistor R4; the resistance of the resistor R1 is equal to that of the resistor R3, and the resistance of the resistor R2 is equal to that of the resistor R4;
the hardware detection resistor branch comprises a resistor Rx1And a resistance Rx2Said resistance Rx1Is connected with a resistor R1 and a far-end compensation terminal S +, the resistor Rx1And the other end of the power supply and a voltage positive line U at the power supply output portsas+ connection;
the resistor Rx2Is connected with a resistor R3 and a far-end compensation terminal S-, the resistor Rx2And the other end of the power supply and a voltage positive line U at the power supply output portsas-connecting; resistance Rx1And a resistance Rx2Are all R when the resistance values are equal to each otherxAnd is greater than the equivalent impedance of the output side power cable.
As a further improvement of the invention, when the voltage U at the output terminal of the operational amplifier OPAsas_saWith a fixed input voltage U at the power supply output portsas+ and UsasAnd-satisfies the mathematical relation as formula (1), the compensation terminals S + and S-are normally connected.
Wherein: r1 is the resistance of the resistor R1, and R2 is the resistance of the resistor R2.
As a further improvement of the invention, if the user does not correctly connect the compensating terminal connecting wires S + and S-, the output voltage of the remote voltage sampling circuit at the power output end deviates from the theoretical expected value voltage; when S + is correctly connected and S-is not normally connected, the voltage U at the output end of the operational amplifier OPAsas_saLarger than the theoretical expected value; when S + is disconnected and not normally connected, S-is normally connected, S + and S-are both disconnected, and S + and S-are reversely connected, the voltage U at the output end of the operational amplifier OPAsas_saSmaller than the theoretical expected value;
wherein the theoretical expected value is calculated by the following formula (2):
and S + and S-are positive line voltage and return line voltage of a far-end compensation end of the output voltage of the power supply.
As a further improvement of the invention, when the voltage U at the output terminal of the operational amplifier OPAsas_saWith a fixed input voltage U at the power supply output portsas+ and UsasIf the mathematical relationship is satisfied as in formula (3), judging that S + is correctly connected and S-is not correctly connected;
as a further improvement of the invention, when the voltage U at the output terminal of the operational amplifier OPAsas_saWith a fixed input voltage U at the power supply output portsas+ and UsasIf the mathematical relation of the formula (4) is satisfied, judging that S + is not correctly connected and S-is correctly connected;
as a further improvement of the invention, when the voltage U at the output terminal of the operational amplifier OPAsas_saWith a fixed input voltage U at the power supply output portsas+ and UsasIf the mathematical relationship of the formula (5) is satisfied, judging that both S + and S-are disconnected and are not connected correctly;
as a further improvement of the invention, when the voltage U at the output terminal of the operational amplifier OPAsas_saWith a fixed input voltage U at the power supply output portsas+ and UsasIf the mathematical relationship is satisfied as in formula (6), it is judged that both S + and S-are not correctly disconnectedConnecting;
wherein the power output end remote voltage sampling circuit is a differential sampling circuit.
The normalization judgment condition for judging whether the compensation terminals S + and S-are correctly connected is to compare the differential sampling output voltage of the added hardware detection resistor with the differential sampling voltage value at the power output port, and judge the difference state between the two values, namely the connection state of the two compensation terminal connecting wires S + and S-of the power output port in the current state can be judged.
The detection method carries out theoretical derivation on the differential sampling input and output relations of the compensation terminal in different connection states, a simulation verification experiment is given, and the experimental conclusion also shows the feasibility and effectiveness of the detection method and the judgment basis.
Compared with the prior art, the invention has the beneficial effects that:
by adopting the technical scheme of the invention, the detection and judgment of different connection states of the compensation connection terminals S + and S-are realized by adding a hardware detection resistance branch circuit in a differential sampling circuit of the power output port. The method for detecting the connection state of the compensation terminal can timely report faults and maintain the safety of a test field to realize reliable test. The added hardware circuit is simple and convenient, has low cost, and the judgment method is simple and reliable and can be directly applied to actual engineering; the method is not only suitable for power supply application occasions with the output end voltage differential sampling circuit, but also can be applied to any power supply equipment with the output end voltage sampling circuit with the compensation connecting terminal.
Drawings
FIG. 1 is a circuit diagram of a hardware-in-loop compensation terminal connection status detection circuit according to an embodiment of the present invention; wherein, (a) is the normal differential sampling circuit of the prior art, and (b) is the differential sampling circuit diagram of the invention with the addition of the hardware detection resistance branch.
FIG. 2 is a differential sampling circuit for different cases with the addition of a hardware detection resistor branch according to an embodiment of the present invention; wherein (a) is S + correctly and S-incorrectly connected, (b) is S + incorrectly and S-correctly connected; (c) disconnecting incorrect connections for both S + and S-; (d) and the S + and the S-are reversely connected.
FIG. 3 is a schematic diagram of a simulation circuit of the compensation terminal state detection circuit according to an embodiment of the present invention; the circuit comprises a remote compensation differential sampling circuit and a differential sampling circuit, wherein the remote compensation differential sampling circuit is used as (a), and the differential sampling circuit is used as (b) a differential sampling circuit added with a compensation connection state detection method.
FIG. 4 is a diagram illustrating an analysis of the effect of adding a compensation terminal state detection circuit on the output result of the differential sampling circuit according to an embodiment of the present invention; wherein, (a) is a u sampling output voltage contrast waveform, and (b) is a relative error precision curve.
FIG. 5 is a comparison graph of simulation of the output voltage waveforms of the differential sampling in four combinations where the S + and S-compensation terminals are not normally connected according to the embodiment of the present invention.
FIG. 6 is a graph comparing the variation of the differential sampling ratio in the voltage range of 0V-170V in the four S + and S-error connection states of the embodiment of the present invention; wherein, (a) is an integral contrast diagram in a voltage range of 0V-170V, and (b) is a detail amplification contrast diagram in a voltage range of 0V-20V.
FIG. 7 is a comparison graph of sampled voltage versus error curves for four types of misconnection conditions, S + and S-in accordance with an embodiment of the present invention; wherein, (a) is an integral contrast diagram in a voltage range of 0V-170V, and (b) is a detail amplification contrast diagram in a voltage range of 0V-20V.
Detailed Description
Preferred embodiments of the present invention are described in further detail below.
Example 1
In order to ensure the dynamic response performance of the high-power dc power supply, a fully differential proportional sampling circuit or a resistance voltage-dividing network circuit is generally used to implement voltage sampling at the output end of the power supply. The input signal of the differential sampling circuit is the voltage U at the load end after the power supply is loadedoutTwo differential lines S + and S-, the differential proportional resistors are R respectively1And R2Differential sampling outputThe output end voltage is Usas_sa。
The method for detecting the connection state of S + and S-in a ring by hardware of this embodiment is shown in fig. 1 (b). Namely, the remote voltage sampling circuit at the power supply output end comprises an operational amplifier OPA, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the remote compensation terminal S + is connected with the non-inverting input end of the operational amplifier OPA through the resistor R1, and the non-inverting input end of the operational amplifier OPA is grounded through the resistor R2; the remote compensation terminal S-is connected to the inverting input of the operational amplifier OPA through a resistor R3, and the inverting input of the operational amplifier OPA is connected to the output of the operational amplifier OPA through a resistor R4; the resistances of the resistor R1 and the resistor R3 are equal to each other and are R1, and the resistances of the resistor R2 and the resistor R4 are equal to each other and are both R2; the hardware detection resistor branch comprises a resistor Rx1And a resistance Rx2Said resistance Rx1Is connected with a resistor R1 and a far-end compensation terminal S +, the resistor Rx1And the other end of the power supply and a voltage positive line U at the power supply output portsas+ connection; the resistor Rx2Is connected with a resistor R3 and a far-end compensation terminal S-, the resistor Rx2And the other end of the power supply and a voltage positive line U at the power supply output portsas-connecting; resistance Rx1And a resistance Rx2Are all R when the resistance values are equal to each otherxAnd is much larger than the equivalent impedance of the output power cable.
As can be derived from fig. 1(a), the theoretical fully-differential sampling proportion formula is as follows:
wherein, Usas+ and Usas-a positive line voltage and a return line voltage, respectively, at the power supply output; and S + and S-are respectively the positive line voltage and the return line voltage of the remote compensation end of the output voltage of the power supply.
Adding hardware in-loop auxiliary resistor Rx1And Rx2After the proportional branch, as shown in FIG. 1(b), if the user does not correctly connect the compensation terminal connection lines S + and S-, the auxiliary resistor R is usedxRatio of (A to (B)The branch circuit influences the final theoretical differential sampling proportion to cause the output voltage U of the differential sampling circuitout_saDeviating from the theoretical sampling voltage value. Only when the user is completely and normally connected with the two compensation terminals S + and S- (S + _ Y S- _ Y for short), the voltage positive line S + at the load end and the voltage positive line U at the output port of the power supply are connectedsas+ short circuit, load end voltage negative line S-and power source output port voltage positive line Usas-short-circuiting. Due to the selected RxThe equivalent impedance of the power cable far greater than the output end is far greater than that of the power cable, so that the sampling proportion of the differential sampling circuit added with the hardware detection resistance branch circuit is unchanged as long as a user correctly connects the compensation terminals S + and S-, and the theoretical differential sampling voltage value is not influenced.
The detection circuit can judge whether a user is correctly connected with the compensation connecting terminal at the early stage of power supply output, can monitor the connection state of the compensation terminals S + and S-in real time under the condition of power output, and reports faults in time to complete the shutdown protection function. The testing problem caused by the uncertainty of manual connection of the cables in the testing field under the condition of real-time power output is avoided.
The following explains the judgment basis for the compensation terminal erroneous connection state.
The differential sampling circuit inputs the signal compensation terminals S + and S-, and the correct connection state is that both S + and S-are correctly connected (S + _ Y S- _ Y for short), and the possibility of the wrong connection state can be divided into four kinds, as shown in fig. 2. I.e., S + is correctly connected, S-is not correctly connected (S + _ Y S-N for short), as shown in FIG. 2 (a); s + disconnects incorrect connection, S-correct connection (S + _ N S- _ Y for short), as shown in FIG. 2 (b); both S + and S-are disconnected from the incorrect connection (S + _ N S-N for short), as shown in FIG. 2 (c); and S + and S-Reverse (S + S-Reverse for short) as shown in FIG. 2 (d). And theoretical derivation is respectively carried out on the relation between the differential sampling output and the differential sampling input under each condition of the wrong connection state, and reliable detection judgment basis is provided.
(1) S + _ Y S- _ Y connection state
When the compensation terminals S + and S-are both normally connected, the normal differential proportional sampling circuit is obtained, and the mathematical relationship between the differential sampling voltage Usas _ sa and the fixed input voltages Usas + and Usas-is as follows:
(2) s + _ Y S- _ N connected state
The voltage U of the OPA non-inverting terminal pin can be derived from the state of the connection circuit shown in FIG. 2(a)non-invThe following were used:
wherein: u shapenon-inv-a non-inverting terminal voltage network for the operational amplifier.
Because the S-terminal connecting line is in a disconnected state, the voltage U of the pin at the reverse end of the operational amplifier can be deducedinvThe following were used:
wherein: u shapeinv-an inverting terminal voltage network for the operational amplifier.
Regardless of the cable impedance, there are:
Usas+＝S+
due to the existence of Unon-inv＝UinvThe differential sampling voltage U can be simply obtainedsas_saAnd a fixed input voltage Usas+ and Usas-the mathematical relationship between, as follows:
(3) s + _ N S- _ Y connection state
The voltage U of the OPA non-inverting terminal pin can be derived from the state of the connection circuit shown in FIG. 2(b)non-invThe following were used:
due to the S-terminal and the UsasShort circuit, then the voltage U of the pin at the inverting terminal of the operational amplifier can be deducedinvThe following were used:
regardless of the cable impedance, there are:
Usas-＝S-
due to the existence of Unon-inv＝UinvThe differential sampling voltage U can be simply obtainedsas_saAnd a fixed input voltage Usas+ and Usas-the mathematical relationship between, as follows:
(4) s + _ N S- _ N connected state
The differential sampling voltage U can be derived from the state of the connection circuit of FIG. 2(c)sas_saAnd a fixed input voltage Usas+ and Usas-the mathematical relationship between, as follows:
(5) s + and S-are connected in reverse
The differential sampling voltage U can be derived from the state of the connection circuit of FIG. 2(d)sas_saAnd a fixed input voltage Usas+ and Usas-the mathematical relationship between, as follows:
the mathematical expression relationship of the connection states of S + and S-to the differentially sampled output voltages is summarized in table 1 below.
TABLE 1 sampling voltage output relation corresponding to different connection states of remote voltage compensation terminal
Analyzing the equation of the differential sampling relationship of the four wrong connection states shows that when S + is correctly connected and S-is not normally connected, the sampling voltage value U output by the differential sampling circuit is providedsas_saGreater than expected. And the other three working conditions, namely S + is disconnected and is not normally connected, S-is normally connected, S + and S-are both disconnected, and S + and S-are reversely connected, and the sampling voltage value output by the differential sampling circuit is smaller than the expected value.
Therefore, the normalization judgment condition for judging whether the compensation terminals S + and S-are correctly connected is to compare the differential sampling output voltage of the added hardware detection resistor with the differential sampling voltage value at the power supply output port, judge the difference state between the two differential sampling output voltages, and judge the connection state of the two compensation terminal connecting lines S + and S-of the power supply output port in the current state.
Example 2
The following simulation experiment was performed for the detection method of example 1.
In the differential sampling circuit provided in embodiment 1, the difference between the differential sampling voltage value and the theoretical value is detected, and the difference is used to determine whether the compensation terminals S + and S-of the power supply output terminal are normally connected, and the feasibility of the determination basis can be verified through a simulation experiment. Firstly, verifying whether the voltage value of the output end of the differential sampling circuit added with the hardware detection resistance branch is consistent with the sampling value of the differential sampling circuit not added with the hardware detection resistance branch under the condition of correct connection of S + and S-. Secondly, whether the difference between the output voltage of the differential sampling circuit added with the hardware detection resistance branch circuit and the expected sampling voltage is enough error precision needs to be verified under different error connection states of S + and S-, so that the detection is convenient.
(1) Validity verification of adding compensation connection detection method
And (3) verifying whether the differential sampling circuit of the added hardware detection resistance branch circuit has no influence on the expected sampling voltage value through a simulation experiment. Wherein FIG. 3(a) shows the actual load R without adding a hardware detection resistor branchloadOutput terminal voltage UoutA differential sampling circuit is carried out; fig. 3(b) is a differential sampling circuit with the addition of the proposed hardware detection resistor branch and the correct connection of the compensation terminals S + and S-. And the voltage U of the output end of the power supplysasLinearly changing from 0V to 170V, and presetting positive line impedance R on the power cablecable+ and loop resistance Rcable-0.5 Ω, load resistance R of the outputloadIs 10 omega, the sampling output voltage of the differential sampling circuit is Usas_sa。
From the simulation schematic of fig. 3, the proposed hardware detection resistor branch R is not addedx1And Rx2The differential sampling circuit simulates an output voltage waveform as shown by U in FIG. 4(a)sas_sa idealThe waveform shows that the corresponding sampled voltage waveform is Usas ideal(ii) a Sword hardware detection resistance branch Rx1And Rx2The differential sampling circuit simulates an output voltage waveform as shown by U in FIG. 4(a)sas_sa with detection methodThe waveform shows that the corresponding sampled voltage waveform is Usas with detection method. The data of the simulation waveform is processed to obtain the relative error of the two sampling voltages at different voltages UsasThe relative error accuracy curve under the conditions is shown in FIG. 4 (b).
By comparison of the time-domain waveforms of FIG. 4 and at different voltage values UsasThe relative error accuracy curve shows that the added hardware detection resistance branch circuit has the worst relative error accuracy of 0.00083% to the expected differential sampling voltage output under the condition of correctly compensating the connection of the terminals S + and S-, and almost has no influence on the expected sampling output voltage.
(2) Detection experiment for connection error of compensation terminal
The compensation ends S + and S-of the output end of the power supply are in four error connection states according to the simulation principle diagram given in figure 3And (3) carrying out a wrong connection state detection experiment, and comparing the wrong connection state detection experiment with the theoretical derivation content of the second part, thereby verifying the feasibility of the hardware detection resistance branch on the wrong connection detection of the compensation terminal. Four wrong connection states of S + and S-are simulated in a simulation experiment to obtain the output voltage U of the power supplysasSampled output voltage U varying in the range of 0V-170Vsas_saThe waveform versus the waveform is shown in fig. 5.
As can be seen from the time domain simulation comparison waveform of FIG. 5, in all the S + and S-misconnected states, the input sampling voltage U issasIs identical, under this precondition, S + is correctly connected and S-is not correctly connected, which has such a wrong connection state that the output voltage U is differentially sampledsas_sa S+_Y S-_NIs greater than the desired condition, i.e., the output voltage value U of the differential sampling circuit with both S + and S-properly connectedsas_sa S+_Y S-_Y. And the sampled voltage values of other error connection states are all smaller than the expected output value. The conclusion of the simulation experiment is consistent with the theoretical derivation conclusion of the second part, so that the connection state of the compensation terminals S + and S-of the power supply can be realized by adopting the proposed method of detecting the resistance branch by adding hardware.
When the two compensation terminals are connected in error, the differential sampling proportion K of the differential sampling circuit of the added hardware detection resistorsampleAt UsasIs changed within the full voltage range of (c). Obtaining the sampling proportion K of each connection state of the compensation terminal according to simulation experiment datasampleAnd UsasThe graph of the comparison between the two is shown in FIG. 6, in which FIG. 6(a) shows the whole UsasThe curve variation in the voltage range, FIG. 6(b) is the output terminal voltage UsasThe detail in the range of 0V-20V is enlarged.
From the sampling ratio K of FIG. 6sampleAnd UsasThe comparison of the relation curves shows that the sampling proportion of the corresponding sampling circuit is fixed and unchanged as long as the S + and S-connection states are determined, so that the deviation direction of the sampling output voltage in the compensation terminal wrong connection state in the whole sampling voltage range cannot be changed, and the linear detection in the full voltage range can be realized. But do notIs at the output end of the power supplysasAt a lower time, the sampling ratio KsampleThe detection method has a condition of minimum detection voltage because of nonlinear change, and the simulation shows that the minimum detection input voltage is below 5V.
The relative error precision of the sampling voltage of the sampling circuit is U under different connection states of the compensation terminals S + and S-sasThe comparison accuracy curve of the full voltage range 0V-170V is shown in FIG. 7. Wherein FIG. 7(a) is the whole UsasThe variation of the precision curve in the voltage range, and FIG. 7(b) shows the output voltage UsasThe detail in the range of 0V-20V is enlarged.
From the sampling ratio Accuracy and U of FIG. 7sasAs can be seen from the comparison of the relation curves, as long as the S + and S-connection states are determined, the sampling precision of the corresponding sampling circuit is unchanged, and the best sampling precision of the wrong connection state is also 4.78%, so that the wrong connection state of the compensation terminals S + and S-can be accurately detected by both digital and analog circuits. Similarly, when the output voltage of the power supply is low, the relative error precision is small, so the detection method has a condition of minimum detection voltage, and simulation shows that the minimum detection input voltage is below 5V.
It can be seen from the above verification experiments that the detection method of the connection state of the compensation terminal and the feasibility and validity of the judgment basis in embodiment 1 are not only suitable for power supply application occasions with the output terminal voltage differential sampling circuit, but also applicable to any power supply equipment with the output terminal voltage sampling circuit of the compensation connection terminal, the addition of a hardware circuit is simple and convenient, the cost is low, and the judgment method is simple and reliable, and can be directly applied to practical engineering.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. A method for detecting the connection state of a power supply far-end voltage compensation end is characterized by comprising the following steps: a hardware detection resistance branch is added in the power output end remote voltage sampling circuit, and the connection state of the current remote compensation terminals S + and S-is detected in real time by judging the comparison between the output voltage of the power output end remote voltage sampling circuit and the theoretical expected value voltage;
the remote voltage sampling circuit at the power output end comprises an operational amplifier OPA, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the remote compensation terminal S + is connected with the non-inverting input end of the operational amplifier OPA through the resistor R1, and the non-inverting input end of the operational amplifier OPA is grounded through a resistor R2; the remote compensation terminal S-is connected to the inverting input of the operational amplifier OPA through a resistor R3, and the inverting input of the operational amplifier OPA is connected to the output of the operational amplifier OPA through a resistor R4; the resistance of the resistor R1 is equal to that of the resistor R3, and the resistance of the resistor R2 is equal to that of the resistor R4;
the hardware detection resistor branch comprises a resistor Rx1And a resistance Rx2Said resistance Rx1Is connected with a resistor R1 and a far-end compensation terminal S +, the resistor Rx1And the other end of the power supply and a voltage positive line U at the power supply output portsas+ connection;
the resistor Rx2Is connected with a resistor R3 and a far-end compensation terminal S-, the resistor Rx2And the other end of the power supply and a voltage positive line U at the power supply output portsas-connecting; resistance Rx1And a resistance Rx2Are all R when the resistance values are equal to each otherxAnd is greater than the equivalent impedance of the output end power cable;
when the voltage U at the output terminal of the operational amplifier OPAsas_saWith a fixed input voltage U at the power supply output portsas+ and UsasThe compensation terminals S + and S-are normally connected if the mathematical relation of the formula (1) is met;
wherein: r1 is the resistance of the resistor R1, and R2 is the resistance of the resistor R2.
2. The method for detecting the connection status of the power supply far-end voltage compensation terminal according to claim 1, wherein: if the user does not correctly connect the compensating terminal connecting wires S + and S-, the output voltage of the remote voltage sampling circuit at the power output end deviates from the theoretical expected value voltage; when S + is correctly connected and S-is not normally connected, the voltage U at the output end of the operational amplifier OPAsas_saLarger than the theoretical expected value; when S + is disconnected and not normally connected, S-is normally connected, S + and S-are both disconnected, and S + and S-are reversely connected, the voltage U at the output end of the operational amplifier OPAsas_saSmaller than the theoretical expected value;
wherein the theoretical expected value is calculated by the following formula (2):
and S + and S-are positive line voltage and return line voltage of a far-end compensation end of the output voltage of the power supply.
3. The method for detecting the connection status of the power supply far-end voltage compensation terminal according to claim 2, wherein: when the voltage U at the output terminal of the operational amplifier OPAsas_saWith a fixed input voltage U at the power supply output portsas+ and UsasIf the mathematical relationship is satisfied as in formula (3), judging that S + is correctly connected and S-is not correctly connected;
4. the method for detecting the connection status of the power supply remote voltage compensation terminal according to claim 3, wherein: when the voltage U at the output terminal of the operational amplifier OPAsas_saAnd power supply output portAt a fixed input voltage Usas+ and UsasIf the mathematical relation of the formula (4) is satisfied, judging that S + is not correctly connected and S-is correctly connected;
5. the method for detecting the connection status of the power supply remote voltage compensation terminal according to claim 4, wherein: when the voltage U at the output terminal of the operational amplifier OPAsas_saWith a fixed input voltage U at the power supply output portsas+ and UsasIf the mathematical relationship of the formula (5) is satisfied, judging that both S + and S-are disconnected and are not connected correctly;
6. the method for detecting the connection status of the power supply remote voltage compensation terminal according to claim 5, wherein: when the voltage U at the output terminal of the operational amplifier OPAsas_saWith a fixed input voltage U at the power supply output portsas+ and UsasIf the mathematical relationship of the formula (6) is satisfied, judging that both S + and S-are disconnected and are not connected correctly;
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| CN114895737B (en) * | 2022-03-07 | 2023-04-25 | 哈尔滨工业大学（深圳） | Remote voltage real-time compensation system and compensation method based on power supply cable impedance detection |
| CN115963912B (en) * | 2023-03-10 | 2023-07-18 | 苏州浪潮智能科技有限公司 | Power supply control method, system, equipment and medium for server power supply device component |
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| US7642788B2 (en) * | 2006-12-04 | 2010-01-05 | Fluke Corporation | Voltage measurement instrument and method having improved automatic mode operation |
| JP5333619B2 (en) * | 2011-03-30 | 2013-11-06 | 株式会社デンソー | Voltage detection device and coupling circuit |
| CN205229272U (en) * | 2015-12-02 | 2016-05-11 | 陕西长武亭南煤业有限责任公司 | Chain SVG power module direct current busbar voltage's sampling modulate circuit |
| CN206894527U (en) * | 2017-04-24 | 2018-01-16 | 深圳市鼎阳科技有限公司 | A kind of linear DC power supply and its circuit for compensating line loss |
| CN206850425U (en) * | 2017-06-17 | 2018-01-05 | 艾德克斯电子（南京）有限公司 | A kind of SENSE distal ends voltage compensating circuit of dc source |
| CN107478947B (en) * | 2017-08-16 | 2020-08-21 | 艾德克斯电子（南京）有限公司 | Method for preventing reverse connection or leakage connection of SENSE |
| CN109738736B (en) * | 2018-12-07 | 2021-01-15 | 中电科仪器仪表(安徽)有限公司 | SENSE circuit |
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