A charging pile conversion efficiency calculation method and system

Abstract

The application provides a charging pile conversion efficiency calculation method and system, and relates to the field of charging piles. The charging pile conversion efficiency calculation method comprises receiving charging pile device parameters, adding the switching tube loss of the front-stage rectifier, the rectifier bridge diode loss, the fast recovery diode loss, the switching tube loss of the rear-stage DC / DC converter and the fast recovery diode loss to obtain the overall loss of the charging pile charging module; obtaining the charging pile efficiency calculation formula according to the overall loss of the charging pile charging module; receiving the charging pile output voltage, output current and output power; setting a distribution interval subject to uniform distribution for the input quantity of the Monte Carlo method according to the accuracy level of the electric energy meter of the charging pile, and extracting multiple groups of input quantities from the distribution interval subject to uniform distribution as sample values of the charging pile efficiency calculation formula. The problem that there is no effective means to calculate the charging pile conversion efficiency uncertainty in the current research is solved.

Description

Technical Field

[0001] This invention relates to the field of charging pile technology, specifically to a method and system for calculating the conversion efficiency of charging piles. Background Technology

[0002] With the rapid development of new energy vehicles in my country, the demand for charging piles is also expanding. How to quickly and accurately determine the conversion efficiency of charging piles using known data is a key concern for researchers. Currently, most methods for testing the conversion efficiency of charging piles rely on on-site verification. However, given the explosive growth in the number of charging piles, traditional verification methods face significant challenges, necessitating a new, efficient, and convenient method for remotely measuring the conversion efficiency of charging piles.

[0003] To make the measurement results more reliable and valid, the concept of uncertainty needs to be introduced. Currently, there is no effective method for calculating the uncertainty of charging pile conversion efficiency in this research. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a method and system for calculating the conversion efficiency of charging piles, solving the problem that current research lacks an effective means to calculate the uncertainty of the conversion efficiency of charging piles.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] Firstly, a method for calculating the conversion efficiency of charging piles is provided, including:

[0009] Receive charging pile device parameters, which include front-end rectifier parameters and back-end DC / DC converter parameters;

[0010] Calculate the switching transistor loss, rectifier bridge diode loss, and fast recovery diode loss of the pre-stage rectifier based on the pre-stage rectifier parameter data.

[0011] Calculate the switching losses and fast recovery diode losses of the subsequent DC / DC converter based on the parameter data of the subsequent DC / DC converter.

[0012] The total loss of the charging pile charging module is obtained by adding up the switching losses of the front-end rectifier, the rectifier bridge diode losses, and the fast recovery diode losses, as well as the switching losses of the rear-end DC / DC converter.

[0013] The formula for calculating the efficiency of a charging pile is derived from the total loss of the charging module.

[0014] The output voltage, output current, and output power of the charging pile are received and used as inputs for the Monte Carlo method.

[0015] Based on the accuracy level of the electricity meter of the charging pile, a uniform distribution interval is established for the input of the Monte Carlo method, and multiple sets of inputs are extracted from the uniform distribution interval as sample values ​​for the charging pile efficiency calculation formula.

[0016] Each set of sample values ​​is substituted into the charging pile efficiency calculation formula to obtain the corresponding model value. The mean and standard deviation of all the obtained model values ​​are calculated, and the results are reported.

[0017] Preferably, the parameters of the front-stage rectifier include the switching transistor parameters, bridge diode parameters, and fast recovery diode parameters of the front-stage rectifier; the parameters of the rear-stage DC / DC converter include the switching transistor parameters and fast recovery diode parameters of the rear-stage DC / DC converter.

[0018] Preferably, the loss calculation formula for the switching transistor of the pre-stage rectifier is as follows:

[0019]

[0020] Among them, R DSon f represents the on-state resistance of the switching transistor. sw1 U represents the switching frequency. N It is the peak value of the input voltage, U dc I is the DC output voltage of the rectifier. N V represents the peak value of the input current. DS I is the drain-source voltage of the MOSFET. D For drain current, t on and t off These are the activation time and deactivation time, respectively; t on and t off It is expressed as follows:

[0021]

[0022]

[0023] Among them, R g C represents the drive resistor of the switching transistor in the pre-rectifier stage. iss and C rss C represents parasitic capacitance. iss For the input capacitor, C rss For feedback capacitor, V gs(th) The threshold voltage, V gs(Miller) Here is the Miller plateau voltage, and V is the voltage at which the plateau voltage is reached. ds Drain-source voltage at turn-on, Vg_on and V g_off These represent the gate voltage after turn-on and the gate voltage before turn-off, respectively.

[0024] Preferably, the loss of the rectifier bridge diodes in the pre-stage rectifier is calculated using the following formula:

[0025]

[0026] Among them, u F1 i is the forward voltage drop of the rectifier bridge diodes. F1 T0 is the current flowing through the diode, T0 is the power frequency period, and D(t) is the duty cycle.

[0027] Preferably, the loss of the fast recovery diode in the front-end rectifier is calculated using the following formula:

[0028]

[0029] Among them, u F2 To the forward voltage drop of the fast recovery diode, U FR For positive peak voltage, U F0 t is the diode voltage drop when the diode is turned on. fr For positive recovery time, u r Q is the reverse peak voltage. rr To recover the charge in the reverse direction, i F2 I is the current flowing through the diode. F1 f is the forward current of the diode. sw1 Indicates the switching frequency.

[0030] Preferably, the loss of the switching transistor in the subsequent DC / DC converter is calculated using the following formula:

[0031]

[0032] Among them, R DSon f represents the on-state resistance of the switching transistor. sw2 Indicates the switching frequency, D is the duty cycle, and I is the switching frequency. o For the output current, f sw2 V is the switching frequency of the switching transistor. DS I is the drain-source voltage of the MOSFET. D For drain current, t on and t off These are the activation and deactivation times, respectively.

[0033] Preferably, the loss of the fast recovery diode in the DC / DC converter is calculated using the following formula:

[0034]

[0035] Among them, u F0 For the diode voltage drop, I dav I is the average value of the diode current. drms R is the effective value of the diode current. D U is the on-state resistance. FR For positive peak voltage, U F0 t is the diode voltage drop when the diode is turned on. fr For positive recovery time, u r Q is the reverse peak voltage. rr To recover the charge in the reverse direction, f sw1 f represents the switching frequency. SL The frequency of the secondary square wave is given.

[0036] Preferably, the charging pile efficiency calculation formula is obtained based on the total loss of the charging pile charging module, specifically including:

[0037] The total loss of the charging module of the charging pile is expressed as ΔP=ΔP1+ΔP2+ΔP3+ΔP4+ΔP5;

[0038] The formula for calculating the efficiency of the charging pile is η = f(U o ,I o ,P o ), where η is efficiency, U o For the output voltage, I o For the output current, P o This refers to the output power.

[0039] The formula for calculating the efficiency of charging piles is then transformed to obtain...

[0040] Preferably, the reported results include the mean of η and the shortest coverage interval [mean - standard deviation, mean + standard deviation] with a probability of 95%.

[0041] Secondly, a charging pile conversion efficiency calculation system is provided, including the following modules:

[0042] The first receiving module is used to receive charging pile device parameters, which include front-end rectifier parameters and back-end DC / DC converter parameters.

[0043] The first calculation module is used to calculate the switching transistor loss, rectifier bridge diode loss, and fast recovery diode loss of the front-stage rectifier based on the parameter data of the front-stage rectifier.

[0044] The second calculation module is used to calculate the switching transistor losses and fast recovery diode losses of the subsequent DC / DC converter based on the parameter data of the subsequent DC / DC converter.

[0045] The summation module is used to add up the switching losses of the front-end rectifier, the rectifier bridge diode losses, and the fast recovery diode losses, as well as the switching losses of the rear-end DC / DC converter and the fast recovery diode losses, to obtain the total loss of the charging pile charging module.

[0046] The analysis module is used to obtain the formula for calculating the efficiency of the charging pile based on the total loss of the charging module.

[0047] The second receiving module is used to receive the output voltage, output current and output power of the charging pile, which are used as input quantities for the Monte Carlo method.

[0048] The third calculation module is used to establish a uniformly distributed range for the input of the Monte Carlo method based on the accuracy level of the electricity meter of the charging pile, and to extract multiple sets of inputs from the uniformly distributed range as sample values ​​for the charging pile efficiency calculation formula.

[0049] The output module is used to input each set of sample values ​​into the charging pile efficiency calculation formula, solve for the corresponding model value, calculate the mean and standard deviation of all the obtained model values, and output the report results.

[0050] (III) Beneficial Effects

[0051] This invention provides a method and system for calculating the conversion efficiency of charging piles, which can accurately calculate the conversion efficiency and uncertainty of charging piles. The variables are only the output voltage, output current and output power, eliminating the need for on-site testing and meeting the requirements for efficient and convenient verification of charging pile conversion efficiency. Attached Figure Description

[0052] Figure 1 This is a flowchart of the charging pile conversion efficiency calculation method of the present invention;

[0053] Figure 2 This is a topology diagram of the three-phase Vienna rectifier before the charging module in an embodiment of the present invention;

[0054] Figure 3 This is a topology diagram of the full-bridge phase-shifted DC / DC converter after the charging module in an embodiment of the present invention. Detailed Implementation

[0055] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Example

[0057] like Figure 1 As shown, this embodiment of the invention provides a method for calculating the conversion efficiency of charging piles, including:

[0058] Receive charging pile device parameters, including front-end rectifier parameters and back-end DC / DC converter parameters;

[0059] Calculate the switching transistor loss, rectifier bridge diode loss, and fast recovery diode loss of the pre-stage rectifier based on the pre-stage rectifier parameter data.

[0060] Calculate the switching losses and fast recovery diode losses of the subsequent DC / DC converter based on the parameter data of the subsequent DC / DC converter.

[0061] The total loss of the charging pile charging module is obtained by adding up the switching losses of the front-end rectifier, the rectifier bridge diode losses, and the fast recovery diode losses, as well as the switching losses of the rear-end DC / DC converter.

[0062] The formula for calculating the efficiency of a charging pile is derived from the total loss of the charging module.

[0063] The output voltage, output current, and output power of the charging pile are received and used as inputs for the Monte Carlo method.

[0064] Based on the accuracy class of the charging pile's electricity meter, a uniformly distributed range is established for the input quantities of the Monte Carlo method. Multiple sets of input quantities are then extracted from this uniformly distributed range as sample values ​​for the charging pile efficiency calculation formula. The number of Monte Carlo method trials is determined, typically 10. 6 The number of trials provides a 95% coverage interval, meaning the probability of the result falling within that interval is 95%. (Drawing 10...) 6 Group U o I o and P o The mean and standard deviation of η are the estimated values ​​and standard uncertainty of the model value η, respectively, serving as the input sample values.

[0065] Each set of sample values ​​is substituted into the charging pile efficiency calculation formula to obtain the corresponding model value. The mean and standard deviation of all the obtained model values ​​are calculated, and the results are reported.

[0066] Furthermore, the parameters of the front-end rectifier include the switching transistor parameters, bridge diode parameters, and fast recovery diode parameters; the parameters of the back-end DC / DC converter include the switching transistor parameters and fast recovery diode parameters.

[0067] Furthermore, the formula for calculating the losses of the switching transistors in the pre-amplifier is as follows:

[0068]

[0069] Among them, R DSon f represents the on-state resistance of the switching transistor. sw1 U represents the switching frequency. N It is the peak value of the input voltage, U dc I is the DC output voltage of the rectifier. N V represents the peak value of the input current. DS I is the drain-source voltage of the MOSFET. D For drain current, t on and t off These are the activation time and deactivation time, respectively; t on and t off It is expressed as follows:

[0070]

[0071]

[0072] Among them, R g C represents the drive resistor of the switching transistor in the pre-rectifier stage. iss and C rss C represents parasitic capacitance. iss For the input capacitor, C rss For feedback capacitor, V gs(th) The threshold voltage, V gs(Miller) Here is the Miller plateau voltage, and V is the voltage at which the plateau voltage is reached. ds Drain-source voltage at turn-on, V g_on and V g_off These represent the gate voltage after turn-on and the gate voltage before turn-off, respectively.

[0073] Furthermore, the loss of the rectifier bridge diodes in the pre-amplifier is calculated using the following formula:

[0074]

[0075] Among them, u F1 i is the forward voltage drop of the rectifier bridge diodes. F1 T0 is the current flowing through the diode, T0 is the power frequency period, and D(t) is the duty cycle.

[0076] Furthermore, the loss of the fast recovery diode in the front-end rectifier is calculated using the following formula:

[0077]

[0078] Among them, u F2 To the forward voltage drop of the fast recovery diode, U FR For positive peak voltage, UF0 t is the diode voltage drop when the diode is turned on. fr For positive recovery time, u r Q is the reverse peak voltage. rr To recover the charge in the reverse direction, i F2 I is the current flowing through the diode. F1 f is the forward current of the diode. sw1 Indicates the switching frequency.

[0079] Furthermore, the loss of the switching transistors in the subsequent DC / DC converter is calculated using the following formula:

[0080]

[0081] Among them, R DSon f represents the on-state resistance of the switching transistor. sw2 Indicates the switching frequency, D is the duty cycle, and I is the switching frequency. o For the output current, f sw2 V is the switching frequency of the switching transistor. DS I is the drain-source voltage of the MOSFET. D For drain current, t on and t off These are the activation and deactivation times, respectively.

[0082] Furthermore, the loss of the fast recovery diode in the DC / DC converter is calculated using the following formula:

[0083]

[0084] Among them, u F0 For the diode voltage drop, I dav I is the average value of the diode current. drms R is the effective value of the diode current. D U is the on-state resistance. FR For positive peak voltage, U F0 The diode voltage drop is tfr when it is conducting, and the forward recovery time is u. r Q is the reverse peak voltage. rr To recover the charge in the reverse direction, f sw1 f represents the switching frequency. SL The frequency of the secondary square wave is given.

[0085] Furthermore, based on the overall loss of the charging module, a formula for calculating the charging pile efficiency is derived, which specifically includes:

[0086] The total loss of the charging module of the charging pile is expressed as ΔP=ΔP1+ΔP2+ΔP3+ΔP4+ΔP5;

[0087] The formula for calculating the efficiency of a charging pile is η = f(Uo ,I o ,P o ), where η is efficiency, U o For the output voltage, I o For the output current, P o This refers to the output power.

[0088] In the above expression, each term on the right-hand side represents the output voltage U. o Output current I o Output power P o The efficiency η is a function of the efficiency. Transforming the resulting expression yields information about the efficiency η, output current Io, and output voltage U. o and output power P o The functional relationship is given, and the formula for calculating the efficiency of charging piles is obtained after transformation.

[0089] Furthermore, the report results include the mean of η and the shortest coverage interval [mean - standard deviation, mean + standard deviation] with a probability of 95%.

[0090] By following the steps above, you only need to input the output voltage U during the charging process of the charging station. o Output current I o Output power P o This allows for a more accurate calculation of the conversion efficiency and uncertainty of the charging pile.

[0091] Figure 2 According to an embodiment of the present invention, a Vienna rectifier topology structure for the front stage of a charging module of a charging pile includes a MOSFET switch, two fast recovery diodes and a rectifier bridge in each phase. The rectifier bridge contains four diodes, two of which operate at the power frequency and two of which operate at the high frequency.

[0092] Figure 3 According to an embodiment of the present invention, a full-bridge phase-shifted DC / DC converter topology for the charging module of a charging pile includes four MOSFET switches and four fast recovery diodes.

[0093] Another embodiment of the present invention provides a charging pile conversion efficiency calculation system, including the following modules:

[0094] The first receiving module is used to receive charging pile device parameters, which include front-stage rectifier parameters and back-stage DC / DC converter parameters.

[0095] The first calculation module is used to calculate the switching transistor loss, rectifier bridge diode loss, and fast recovery diode loss of the front-stage rectifier based on the parameter data of the front-stage rectifier.

[0096] The second calculation module is used to calculate the switching transistor losses and fast recovery diode losses of the subsequent DC / DC converter based on the parameter data of the subsequent DC / DC converter.

[0097] The summation module is used to add up the switching losses of the front-end rectifier, the rectifier bridge diode losses, and the fast recovery diode losses, as well as the switching losses of the rear-end DC / DC converter and the fast recovery diode losses, to obtain the total loss of the charging pile charging module.

[0098] The analysis module is used to obtain the formula for calculating the efficiency of the charging pile based on the total loss of the charging module.

[0099] The second receiving module is used to receive the output voltage, output current and output power of the charging pile, which are used as input quantities for the Monte Carlo method.

[0100] The third calculation module is used to establish a uniformly distributed range for the input of the Monte Carlo method based on the accuracy level of the electricity meter of the charging pile, and to extract multiple sets of inputs from the uniformly distributed range as sample values ​​for the charging pile efficiency calculation formula.

[0101] The output module is used to input each set of sample values ​​into the charging pile efficiency calculation formula, solve for the corresponding model value, calculate the mean and standard deviation of all the obtained model values, and output the report results.

[0102] Embodiments of this application may be provided as methods or computer program products. Therefore, this application may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application may be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0103] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1A device that provides the functions specified in one or more boxes.

[0104] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0105] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0106] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for calculating the conversion efficiency of a charging pile, characterized in that, include: Receive charging pile device parameters, which include front-end rectifier parameters and back-end DC / DC converter parameters; Calculate the switching transistor loss, rectifier bridge diode loss, and fast recovery diode loss of the pre-stage rectifier based on the pre-stage rectifier parameter data. Calculate the switching losses and fast recovery diode losses of the subsequent DC / DC converter based on the parameter data of the subsequent DC / DC converter. The total loss of the charging pile charging module is obtained by adding together the switching transistor losses, rectifier bridge diode losses, and fast recovery diode losses of the front-end rectifier and the switching transistor losses and fast recovery diode losses of the rear-end DC / DC converter. The formula for calculating the efficiency of a charging pile is derived from the total loss of the charging module. The output voltage, output current, and output power of the charging pile are received and used as inputs for the Monte Carlo method. Based on the accuracy level of the electricity meter of the charging pile, a uniform distribution interval is established for the input of the Monte Carlo method, and multiple sets of inputs are extracted from the uniform distribution interval as sample values ​​for the charging pile efficiency calculation formula. Each set of sample values ​​is substituted into the charging pile efficiency calculation formula to obtain the corresponding model value. The mean and standard deviation of all the obtained model values ​​are calculated, and the results are reported.

2. The method for calculating the conversion efficiency of a charging pile according to claim 1, characterized in that: The parameters of the front-stage rectifier include the switching transistor parameters, bridge diode parameters, and fast recovery diode parameters of the front-stage rectifier; the parameters of the rear-stage DC / DC converter include the switching transistor parameters and fast recovery diode parameters of the rear-stage DC / DC converter.

3. The method for calculating the conversion efficiency of a charging pile according to claim 2, characterized in that: The loss calculation formula for the switching transistor of the pre-stage rectifier is as follows: Among them, R DSon f represents the on-state resistance of the switching transistor. sw1 U represents the switching frequency. N It is the peak value of the input voltage, U dc I is the DC output voltage of the rectifier. N V represents the peak value of the input current. DS I is the drain-source voltage of the MOSFET. D For drain current, t on and t off These are the activation time and deactivation time, respectively; t on and t off It is expressed as follows: Among them, R g C represents the drive resistor of the switching transistor in the pre-rectifier stage. iss and C rss C represents parasitic capacitance. iss For the input capacitor, C rss For feedback capacitor, V gs(th) The threshold voltage, V gs(Miller) V is the Miller plateau voltage. ds V is the drain-source voltage at turn-on. g_on and V g_off These represent the gate voltage after turn-on and the gate voltage before turn-off, respectively.

4. The method for calculating the conversion efficiency of a charging pile according to claim 3, characterized in that: The loss of the rectifier bridge diodes in the pre-stage rectifier is calculated using the following formula: Among them, u F1 i is the forward voltage drop of the rectifier bridge diodes. F1 T0 is the current flowing through the diode, T0 is the power frequency period, and D(t) is the duty cycle.

5. The method for calculating the conversion efficiency of a charging pile according to claim 4, characterized in that: The loss of the fast recovery diode in the front-end rectifier is calculated using the following formula: Among them, u F2 To the forward voltage drop of the fast recovery diode, U FR For positive peak voltage, U F0 t is the diode voltage drop when the diode is turned on. fr For positive recovery time, u r Q is the reverse peak voltage. rr To recover the charge in the reverse direction, i F2 I is the current flowing through the diode. F1 f is the forward current of the diode. sw1 Indicates the switching frequency.

6. The method for calculating the conversion efficiency of a charging pile according to claim 5, characterized in that: The loss of the switching transistors in the subsequent DC / DC converter is calculated using the following formula: Among them, R DSon This represents the on-state resistance of the switching transistor, where D is the duty cycle and I is the on-state resistance. o For the output current, f sw2 V is the switching frequency of the switching transistor. DS I is the drain-source voltage of the MOSFET. D For drain current, t on and t off These are the activation and deactivation times, respectively.

7. The method for calculating the conversion efficiency of a charging pile according to claim 6, characterized in that: The loss of the fast recovery diode in the DC / DC converter is calculated using the following formula: Among them, u F0 For the diode voltage drop, I dav I is the average value of the diode current. drms R is the effective value of the diode current. D U is the on-state resistance. FR For positive peak voltage, U F0 t is the diode voltage drop when the diode is turned on. fr For positive recovery time, u r Q is the reverse peak voltage. rr To recover the charge in the reverse direction, f sw1 f represents the switching frequency. SL The frequency of the secondary square wave is given.

8. The method for calculating the conversion efficiency of a charging pile according to claim 7, characterized in that: The formula for calculating the efficiency of a charging pile is derived from the overall loss of the charging module, specifically including: The total loss of the charging module of the charging pile is expressed as: ; The formula for calculating the efficiency of the charging pile is as follows: ,in η For efficiency, U o For the output voltage, I o For the output current, P o This refers to the output power. The formula for calculating the efficiency of charging piles is then transformed to obtain... .

9. The method for calculating the conversion efficiency of a charging pile according to claim 8, characterized in that: The report results include η The mean and the shortest containment interval with a probability of 95% [mean - standard deviation, mean + standard deviation].

10. A charging pile conversion efficiency calculation system, characterized in that, The system is used to implement the charging pile conversion efficiency calculation method according to claim 9, and the system includes the following modules: The first receiving module is used to receive charging pile device parameters, which include front-end rectifier parameters and back-end DC / DC converter parameters. The first calculation module is used to calculate the switching transistor loss, rectifier bridge diode loss, and fast recovery diode loss of the front-stage rectifier based on the parameter data of the front-stage rectifier. The second calculation module is used to calculate the switching transistor losses and fast recovery diode losses of the subsequent DC / DC converter based on the parameter data of the subsequent DC / DC converter. The summation module is used to add up the switching losses of the front-end rectifier, the rectifier bridge diode losses, and the fast recovery diode losses, as well as the switching losses of the rear-end DC / DC converter and the fast recovery diode losses, to obtain the total loss of the charging pile charging module. The analysis module is used to derive the formula for calculating the efficiency of the charging pile based on the total loss of the charging module. The second receiving module is used to receive the output voltage, output current and output power of the charging pile, which are used as input quantities for the Monte Carlo method. The third calculation module is used to establish a uniformly distributed range for the input of the Monte Carlo method based on the accuracy level of the electricity meter of the charging pile, and to extract multiple sets of inputs from the uniformly distributed range as sample values ​​for the charging pile efficiency calculation formula. The output module is used to input each set of sample values ​​into the charging pile efficiency calculation formula, solve for the corresponding model value, calculate the mean and standard deviation of all the obtained model values, and output the report results.

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