Multi-channel electronic load capable of realizing channel selection function

Abstract

The invention discloses a multi-channel electronic load capable of realizing a channel selection function, the multi-channel electronic load passes through an Ob objective function comprising a plurality of objective weights, W1, W2 and W3 are weights of power consumption, efficiency and temperature balance respectively, through the objective function, the power dissipation of each channel is calculated according to the real-time values of voltage Vi and current Ii, and the power consumption of each channel is calculated according to the real-time values of the voltage Vi and the current Ii. And the channels are selectively opened or closed to minimize an Ob objective function value and optimize power dissipation Pi of each channel, so that energy efficiency maximization is realized, unnecessary energy consumption is avoided, and the utilization rate of resources is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic loads, and more particularly to a multi-channel electronic load capable of realizing a channel selection function. Background Art

[0002] With the development of science and technology, various electronic products emerge in an endless stream. The most important factor that determines whether electronic products can operate normally is the power supply, and the key to ensuring the quality of the power supply is the load. Early load devices mainly adopted a constant load resistance method, which mainly calculated the actual required resistance value based on the actual required current and voltage values, and then selected the resistance of the corresponding power to build the actual circuit. The disadvantages of this method are limited power and limited measurement range. With the emergence and application of electronic loads, the quality and efficiency of power supply testing have been effectively improved, which is conducive to the establishment of an automatic test system platform.

[0003] An electronic load is a device that can simulate real load conditions and is widely used in performance testing of power supplies, batteries, and other electronic devices. By adjusting parameters such as current, voltage, and resistance, various load conditions can be simulated, such as constant current load, constant voltage load, and programmable load, so as to test the performance of electronic components and electronic products under different load conditions. Electronic loads have multiple working modes, including constant current (CC), constant voltage (CV), constant power (CP), and constant resistance (CR) modes, which enable them to adapt to different test requirements.

[0004] Common electronic loads on the market are single-channel stand-alone models. In a factory-based power supply test system, one electronic load can only meet the test of one power supply at the same time. In order to improve production test efficiency, it is necessary to buy several electronic loads to form a system to test multiple power modules at the same time. In order to solve these problems, multi-channel electronic loads came into being. Multi-channel electronic loads can test multiple channels at the same time and independently control and measure parameters such as voltage, current and power of each channel.

[0005] However, traditional multi-channel electronic loads lack an efficient channel selection and management mechanism, which makes it difficult to achieve the optimal state in terms of power consumption, efficiency, and temperature balance. Summary of the invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a multi-channel electronic load capable of realizing a channel selection function, so as to solve the problem that the multi-channel electronic load lacks an efficient channel selection and management mechanism, resulting in difficulty in achieving an optimal state in terms of power consumption, efficiency and temperature balance.

[0007] The technical solution of the present invention is as follows: a multi-channel electronic load capable of realizing a channel selection function, comprising a host control module, a plurality of slave control modules and a plurality of power dissipation modules, wherein the plurality of slave control modules and the plurality of power dissipation modules are connected in a one-to-one correspondence;

[0008] The host control module is used to communicate with the host computer and receive the instructions and data sent by the host computer; the host control module obtains the current channel voltage, current and real-time status information of the power dissipation module fed back by each slave control module in real time through the internal communication bus;

[0009] Calculate the power dissipation of each channel based on the obtained voltage and current values;

[0010] Set the Ob objective function containing multiple objective weights, specifically:

[0011]

[0012] Among them, W 1 , W 2 and W 3 are the weights of power consumption, efficiency and temperature balance, P i is the power dissipation of the ith channel, X i is a binary variable indicating whether the i-th channel is selected, V i and I i are the voltage and current values ​​of the ith channel, P max For the maximum power consumption limit, V max and I max are the maximum values ​​of voltage and current respectively, T i is the temperature of the ith channel, T avg is the average temperature of all channels;

[0013] The host control module solves the channel selection scheme that minimizes the Ob objective function value according to the set Ob objective function and the voltage, current and temperature values ​​obtained in real time, so as to determine the X of each channel. i , according to the solved channel selection scheme, control the switch state of each channel.

[0014] Furthermore, the dynamic adjustment process of the weight of power consumption, efficiency and temperature balance includes:

[0015] (1) Obtain the voltage value V of each channel in real time i (t), current value I i (t) and temperature value T i (t), where i represents the channel number and t represents time;

[0016] (2) Calculate the power dissipation P of each channel based on the voltage and current values ​​obtained in real time i(t) = V i (t)×I i (t), and calculate the total power dissipation P total (t);

[0017] (3) According to the efficiency index η(t), the efficiency of the current electronic load is measured. The efficiency index η(t) formula is:

[0018]

[0019] Where V max and I max are the maximum values ​​of voltage and current respectively; X i (t) indicates whether the i-th channel is selected at time t;

[0020] (4) According to the preset power setting value P set , efficiency setting value η set , temperature setting value T set As well as the current working mode M, the weight W in the Ob objective function is dynamically adjusted using the following formula 1 (t), W 2 (t) and W 3 (t):

[0021]

[0022] Among them, α 1 , α 2 , α 3 is the weight adjustment coefficient, α 1 , α 2 , α 3 The value of β is between 0 and 1; 1 , β 2 is the smoothing adjustment coefficient, with a value between 0 and 1, P max , P min is the maximum power dissipation and the minimum power dissipation, η max , η min is the maximum efficiency and minimum efficiency, T max 、T min is the maximum temperature and the minimum temperature.

[0023] Furthermore, the host control module communicates with the host computer through the RS232 interface, and receives instructions and data sent by the host computer, including the target channel number, working mode and corresponding set values; the host control module communicates with the slave control modules of each channel through the UART bus, and obtains the current channel voltage, current and real-time status information of the power dissipation module fed back by each slave control module in real time.

[0024] Furthermore, it also includes a power board, which is connected to the host control module, multiple slave control modules and multiple power dissipation modules to supply power to the host control module, multiple slave control modules and multiple power dissipation modules.

[0025] Furthermore, the electronic load includes:

[0026] Input interface unit, connected to the power supply to be tested, and introduces the power supply output;

[0027] The power electronic converter adjusts the input current according to the set load characteristics to simulate different load conditions.

[0028] Furthermore, it also includes a redundant power supply module, which is used to provide backup power when a power board fails to ensure stable operation of the system.

[0029] Furthermore, the redundant power supply module includes at least two independent power supply units and a diode assembly, the diode assembly includes at least one Schottky diode, the anode of each Schottky diode is connected to the output end of the corresponding power supply unit, and the cathode of the Schottky diode is connected to the power bus.

[0030] Furthermore, the power dissipation module includes a temperature detection circuit and a fan control circuit. The fan control circuit is connected to the temperature detection circuit. The fan control circuit adjusts the fan speed in stages according to the temperature information output by the temperature detection circuit to achieve dynamic control of the heat dissipation efficiency.

[0031] Furthermore, the temperature detection circuit includes at least one temperature sensor for detecting the real-time temperature on the heat sink and converting the temperature information into an electrical signal.

[0032] Furthermore, the fan control circuit includes a PWM signal generating unit and a driving unit. The PWM signal generating unit calculates the duty cycle of the PWM signal based on the temperature information output by the temperature detection circuit. The driving unit includes at least one field effect transistor. The gate of the field effect transistor is used to receive the PWM signal, the source is grounded, and the drain is connected to one end of the fan. The conduction and cutoff of the field effect transistor are controlled according to the PWM signal to control the speed of the fan.

[0033] The present invention according to the above scheme has the following beneficial effects:

[0034] (1) The present invention provides a multi-channel electronic load capable of realizing a channel selection function. The multi-channel electronic load is configured by an Ob objective function including a plurality of target weights, wherein W 1 , W 2 and W 3 are the weights of power consumption, efficiency and temperature balance respectively. Through this objective function, according to the voltage V i and current I iThe real-time value of the power dissipation of each channel is calculated, and the channel is selectively turned on or off to minimize the Ob objective function value and optimize the power dissipation P of each channel. i , thereby maximizing energy efficiency, avoiding unnecessary energy consumption and improving resource utilization.

[0035] (2) The present invention provides a multi-channel electronic load capable of realizing a channel selection function, by setting a maximum power consumption limit P max , Maximum voltage value V max and the maximum current value I max , ensuring that the operation does not exceed these limits, helps prevent equipment damage due to overload, thereby improving system safety. At the same time, by monitoring the temperature T of each channel i and the average temperature T of all channels avg By comparison, overheating can be avoided and safety can be further enhanced.

[0036] (3) The present invention provides a multi-channel electronic load capable of realizing a channel selection function. By introducing a power consumption weight and considering a maximum power consumption limit in an objective function, the power consumption of each channel can be automatically adjusted, thereby making the power consumption distribution of the electronic load more reasonable, effectively reducing the power consumption peak, and improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 is a structural block diagram of a multi-channel electronic load in an embodiment of the present invention;

[0039] Figure 2 Dynamically adjust the flow graph for power consumption, efficiency, and temperature balancing weights. DETAILED DESCRIPTION

[0040] The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0041] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0042] See also Figure 1As shown, a multi-channel electronic load capable of realizing a channel selection function provided by an embodiment of the present invention comprises a host control module, a plurality of slave control modules and a plurality of power dissipation modules, wherein the plurality of slave control modules and the plurality of power dissipation modules are connected in a one-to-one correspondence;

[0043] The host control module is used to communicate with the host computer and receive the instructions and data sent by the host computer; the host control module obtains the current channel voltage, current and real-time status information of the power dissipation module fed back by each slave control module in real time through the internal communication bus;

[0044] Calculate the power dissipation of each channel based on the obtained voltage and current values;

[0045] Set the Ob objective function containing multiple objective weights, specifically:

[0046]

[0047] Among them, W 1 , W 2 and W 3 are the weights of power consumption, efficiency and temperature balance, P i is the power dissipation of the ith channel, X i is a binary variable indicating whether the i-th channel is selected, V i and I i are the voltage and current values ​​of the ith channel, P max For the maximum power consumption limit, V max and I max are the maximum values ​​of voltage and current respectively, T i is the temperature of the ith channel, T avg is the average temperature of all channels;

[0048] The host control module solves the channel selection scheme that minimizes the Ob objective function value according to the set Ob objective function and the voltage, current and temperature values ​​obtained in real time, so as to determine the X of each channel. i , according to the solved channel selection scheme, control the switch state of each channel.

[0049] Specifically, the multi-channel electronic load uses an Ob objective function that includes multiple target weights, where W1, W2 and W3 are the weights of power consumption, efficiency and temperature balance, respectively. Through this objective function, the power dissipation of each channel is calculated according to the real-time values ​​of voltage Vi and current Ii, and the channel is selectively opened or closed to minimize the Ob objective function value and optimize the power dissipation Pi of each channel, thereby maximizing energy efficiency, avoiding unnecessary energy consumption and improving resource utilization.

[0050] The multi-channel electronic load that can realize the channel selection function provided in this embodiment ensures that the maximum power consumption limit Pmax, the maximum voltage value Vmax and the maximum current value Imax are set to work without exceeding these limits, which helps to prevent equipment damage caused by overload, thereby improving the safety of the system. At the same time, by monitoring the temperature Ti of each channel and comparing it with the average temperature Tavg of all channels, overheating can be avoided, further enhancing safety.

[0051] The multi-channel electronic load that can realize the channel selection function provided in this embodiment can automatically adjust the power consumption of each channel by introducing power consumption weights and considering the maximum power consumption limit in the objective function, so that the power consumption distribution of the electronic load is more reasonable, the power consumption peak is effectively reduced, and the energy utilization efficiency is improved.

[0052] See also Figure 2 As shown in the figure, the dynamic weight adjustment process of power consumption, efficiency and temperature balance includes:

[0053] (1) Obtain the voltage value V of each channel in real time i (t), current value I i (t) and temperature value T i (t), where i represents the channel number and t represents time;

[0054] (2) Calculate the power dissipation P of each channel based on the voltage and current values ​​obtained in real time i (t) = V i (t)×I i (t), and calculate the total power dissipation P total (t);

[0055] (3) According to the efficiency index η(t), the efficiency of the current electronic load is measured. The efficiency index η(t) formula is:

[0056]

[0057] Among them, V max and I max are the maximum values ​​of voltage and current respectively, X i (t) indicates whether the i-th channel is selected at time t;

[0058] (4) According to the preset power setting value P set , efficiency setting value η set , temperature setting value T set As well as the current working mode M, the weight W in the Ob objective function is dynamically adjusted using the following formula 1 (t), W 2 (t) and W 3 (t):

[0059]

[0060] Among them, α 1 , α 2 , α 3 is the weight adjustment coefficient, α 1 , α 2 , α 3 The value of β is between 0 and 1; 1 , β 2 is the smoothing adjustment coefficient, with a value between 0 and 1, P max , P min is the maximum power dissipation and the minimum power dissipation, η max , η min is the maximum efficiency and minimum efficiency, T max 、T min is the maximum temperature and the minimum temperature.

[0061] Specifically, by dynamically adjusting the power consumption weight W 1 , can flexibly select channels with lower power consumption to work according to the real-time power consumption of different channels, thereby effectively reducing the overall power consumption and improving energy utilization efficiency; by dynamically adjusting the efficiency weight W 2 , can give priority to channels with higher efficiency, and automatically select the channel combination with the best efficiency based on real-time monitoring of the efficiency of each channel, thereby improving operating efficiency. By dynamically adjusting the weight W of temperature balance 3 , which helps to maintain the temperature balance between the channels. By monitoring the temperature of each channel, the working status of the channel can be automatically adjusted to avoid damage to some channels due to overtemperature. At the same time, it can also reduce the overall temperature fluctuation and improve operational stability and reliability.

[0062] In this embodiment, the host control module communicates with the host computer through the RS232 interface, receives the instructions and data sent by the host computer, including the target channel number, working mode and corresponding set value, and controls the constant current (CC), constant voltage (CV), constant power (CW) and constant resistance (CR) modes of each channel through the operation of the host computer. The host control module communicates with the slave control modules of each channel through the UART bus, and obtains the real-time status information of the current channel voltage, current and power dissipation module fed back by each slave control module in real time.

[0063] In this embodiment, the multi-channel electronic load also includes a power board, which is connected to the host control module, multiple slave control modules and multiple power dissipation modules to provide power to the host control module, multiple slave control modules and multiple power dissipation modules.

[0064] Electronic loads include:

[0065] Input interface unit, connected to the power supply to be tested, and introduces the power supply output;

[0066] The power electronic converter adjusts the input current according to the set load characteristics to simulate different load conditions.

[0067] In this embodiment, the multi-channel electronic load further includes a redundant power supply module, which is used to provide backup power when a power board fails to ensure stable operation of the system. Specifically, the redundant power supply module includes at least two independent power supply units and a diode assembly, the diode assembly includes at least one Schottky diode, the anode of each Schottky diode is respectively connected to the output end of the corresponding power supply unit, and the cathode of the Schottky diode is connected to the power bus.

[0068] The traditional fan-assisted cooling method is to run the fan at full speed when the instrument is turned on. This control method has disadvantages such as high noise and energy waste. In order to solve the problems of high noise and energy waste, this embodiment adopts intelligent temperature-controlled fan speed regulation. By controlling the fan speed to be positively correlated with the temperature: when the temperature is higher than the fan turn-on temperature, turn on the fan and rotate at a corresponding speed as the temperature changes; when the temperature is lower than the fan turn-off temperature, turn off the fan; when the temperature is higher than the maximum limit temperature, the fan runs at full speed. Fan speed regulation can not only reduce noise, but also save electricity.

[0069] Specifically, the power dissipation module of this embodiment includes a temperature detection circuit and a fan control circuit. The fan control circuit is connected to the temperature detection circuit. The fan control circuit adjusts the fan speed in stages according to the temperature information output by the temperature detection circuit to achieve dynamic control of the heat dissipation efficiency.

[0070] The temperature detection circuit includes at least one temperature sensor for detecting the real-time temperature on the radiator and converting the temperature information into an electrical signal.

[0071] The fan control circuit includes a PWM signal generating unit and a driving unit. The PWM signal generating unit calculates the duty cycle of the PWM signal according to the temperature information output by the temperature detection circuit. The driving unit includes at least one field effect tube. The gate of the field effect tube is used to receive the PWM signal, the source is grounded, and the drain is connected to one end of the fan. The field effect tube is turned on and off according to the PWM signal to control the speed of the fan. In this embodiment, the fan speed regulation is implemented by PWM pulse width modulation technology. By adjusting the duty cycle of the PWM signal, the time ratio of the field effect tube (FET) being turned on and off can be controlled, thereby controlling the speed of the fan. Specifically, the higher the duty cycle, the longer the field effect tube (FET) is turned on, and the faster the fan speed is; the lower the duty cycle, the shorter the field effect tube (FET) is turned on, and the slower the fan speed is.

[0072] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

[0073] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A multi-channel electronic load capable of realizing a channel selection function, characterized in that: include: A host control module, a plurality of slave control modules and a plurality of power dissipation modules, wherein the plurality of slave control modules and the plurality of power dissipation modules are connected in a one-to-one correspondence; The host control module is used to communicate with the host computer and receive the instructions and data sent by the host computer; the host control module obtains the current channel voltage, current and real-time status information of the power dissipation module fed back by each slave control module in real time through the internal communication bus; Calculate the power dissipation of each channel based on the obtained voltage and current values; Set the Ob objective function containing multiple objective weights, specifically: Among them, W1, W2 and W3 are the weights of power consumption, efficiency and temperature balance respectively, P i is the power dissipation of the ith channel, X i is a binary variable indicating whether the i-th channel is selected, V i and I i are the voltage and current values ​​of the ith channel, P max For the maximum power consumption limit, V max and I max are the maximum values ​​of voltage and current respectively, T i is the temperature of the ith channel, T avg is the average temperature of all channels; The host control module solves the channel selection scheme that minimizes the Ob objective function value according to the set Ob objective function and the voltage, current and temperature values ​​obtained in real time, so as to determine the X of each channel. i , according to the solved channel selection scheme, control the switch state of each channel.

2. A multi-channel electronic load capable of realizing a channel selection function as claimed in claim 1, characterized in that: The dynamic weight adjustment process of power consumption, efficiency and temperature balance includes: (1) Obtain the voltage value V of each channel in real time i (t), current value I i (t) and temperature value T i (t), where i represents the channel number and t represents time; (2) Calculate the power dissipation P of each channel based on the voltage and current values ​​obtained in real time i (t) = V i (t)×I i (t), and calculate the total power dissipation P total (t); (3) According to the efficiency index η(t), the efficiency of the current electronic load is measured. The efficiency index η(t) formula is: Among them, V max and I max are the maximum values ​​of voltage and current respectively, X i (t) indicates whether the i-th channel is selected at time t; (4) According to the preset power setting value P set , efficiency setting value η set , temperature setting value T set As well as the current working mode M, the weights W1(t), W2(t), and W3(t) in the Ob objective function are dynamically adjusted using the following formula: Among them, α1, α2, and α3 are weight adjustment coefficients, and the values ​​of α1, α2, and α3 are between 0 and 1; β1 and β2 are smoothing adjustment coefficients, and the values ​​are between 0 and 1. max , P min is the maximum power dissipation and the minimum power dissipation, η max , η min is the maximum efficiency and minimum efficiency, T max , T min is the maximum temperature and the minimum temperature.

3. A multi-channel electronic load capable of realizing a channel selection function as claimed in claim 1, characterized in that: The host control module communicates with the host computer through the RS232 interface and receives the instructions and data sent by the host computer, including the target channel number, working mode and corresponding set values; the host control module communicates with the slave control modules of each channel through the UART bus and obtains the current channel voltage, current and real-time status information of the power dissipation module fed back by each slave control module in real time.

4. A multi-channel electronic load capable of realizing a channel selection function as claimed in claim 1, characterized in that: It also includes a power board, which is connected to the host control module, multiple slave control modules and multiple power dissipation modules to provide power to the host control module, multiple slave control modules and multiple power dissipation modules.

5. A multi-channel electronic load capable of realizing a channel selection function as claimed in claim 4, characterized in that: Electronic loads include: Input interface unit, connected to the power supply to be tested, and introduces the power supply output; The power electronic converter adjusts the input current according to the set load characteristics to simulate different load conditions.

6. A multi-channel electronic load capable of realizing a channel selection function as claimed in claim 5, characterized in that: It also includes a redundant power supply module, which is used to provide backup power when a power board fails to ensure stable operation of the system.

7. A multi-channel electronic load capable of realizing a channel selection function as claimed in claim 6, characterized in that: The redundant power supply module includes at least two independent power supply units and a diode assembly, the diode assembly includes at least one Schottky diode, the anode of each Schottky diode is connected to the output end of the corresponding power supply unit, and the cathode of the Schottky diode is connected to the power bus.

8. A multi-channel electronic load capable of realizing a channel selection function as claimed in claim 1, characterized in that: The power dissipation module includes a temperature detection circuit and a fan control circuit. The fan control circuit is connected to the temperature detection circuit. The fan control circuit adjusts the fan speed in stages according to the temperature information output by the temperature detection circuit to achieve dynamic control of the heat dissipation efficiency.

9. A multi-channel electronic load capable of realizing a channel selection function as claimed in claim 8, characterized in that: The temperature detection circuit includes at least one temperature sensor for detecting the real-time temperature on the radiator and converting the temperature information into an electrical signal.

10. A multi-channel electronic load capable of realizing a channel selection function as claimed in claim 8, characterized in that: The fan control circuit includes a PWM signal generating unit and a driving unit. The PWM signal generating unit calculates the duty cycle of the PWM signal according to the temperature information output by the temperature detection circuit. The driving unit includes at least one field effect tube. The gate of the field effect tube is used to receive the PWM signal, the source is grounded, and the drain is connected to one end of the fan. The conduction and cutoff of the field effect tube are controlled according to the PWM signal to control the speed of the fan.

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