CN110007249A - A method, device and system for testing LED lamp driving power - Google Patents

Abstract

The invention discloses a method, device and system for testing an LED driving power supply, comprising a data acquisition unit, a power consumption unit and a control unit. The data acquisition unit is connected to the LED driving power supply to be tested, and the power consumption unit controls data according to a feedback signal of the data acquisition unit. The current size acquired by the acquisition unit, the control unit includes a parameter setting module and a fuzzy controller, the parameter setting module is used to set the test standard, and the fuzzy controller is used to judge whether the collected current signal is equal to the set test standard, if If they are not equal, the adjustment amount is calculated and sent to the data acquisition unit. The data acquisition unit sends the adjustment amount to the power consumption unit. The power consumption unit adjusts the current obtained by the data acquisition unit according to the adjustment amount and makes it equal to the test standard value. The invention can fine-tune the output current of the test system, solve the problem of unstable output current caused by the influence of external electromagnetic interference, and improve the accuracy of the test result.

Description

A method, device and system for testing LED lamp driving power

technical field

The invention belongs to the field of LED driving power supply testing, and in particular relates to a LED lamp driving power supply testing method, device and system.

Background technique

In recent years, LED lighting products have been widely used in various occasions, and the quality of its driving power directly restricts the quality of LED lighting and the overall performance of the lighting system. In order to facilitate the quality inspection of the LED driver power supply, improve the test accuracy, and reduce the test cost at the same time, the LED test system is generally used instead of the matching LED light source. The test system device is used to simulate the non-linear load characteristics of the LED, so as to achieve the purpose of testing its driving power.

At present, the test system used for LED drive power test generally adopts A/D sampling to convert the voltage and current signals into digital signals and input them into the microprocessor. signal to simulate the I-V characteristics of the LED driver power supply. Due to external electromagnetic interference, the output current of the LED drive power test system is in error with the set standard value, resulting in low accuracy of the LED drive power test system.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problem in the prior art that the output current of the LED driving power test system is in error with the set standard value due to external electromagnetic interference, and thus the accuracy of the LED driving power test system is not high, a method is provided. The LED lamp driving power test method improves the control accuracy of the LED driving power test system and reduces the test deviation by fine-tuning the output current of the LED driving power test system.

In order to achieve the above object, technical scheme of the present invention is as follows:

A method for testing an LED drive power supply, comprising:

S1: Set the test standard value;

S2: Obtain test information, the test information includes a current signal, if the collected current signal is not equal to the set test standard, calculate the adjustment amount and adjust the collected current signal;

S3: The collected current signal is adjusted by the fuzzy control method, so that the collected current signal is equal to the set test standard.

Further, the fuzzy control method in the step S3 includes:

Select a two-dimensional control structure to determine the input and output of the fuzzy control, the input of the fuzzy control is configured as the error e of the input current and the rate of change ec of the error e, and the output of the fuzzy control is configured as the current signal. Variation e(t) is the input current error value corresponding to the time point, K _p is the proportional coefficient, K _i is the integral coefficient, adjust K _p and K _i to adjust the output;

Set the fuzzy subset of the input and output language values of the fuzzy control to {NB, NM, NS, ZO, PS, PM, PB}, and set the domain of discourse of the input to [-6, -5, -4,-3,-2,-1,0,1,2,3,4,5,6], set the fuzzy domain of the output to [-1,1], then add the input and output Quantity membership function;

The membership function of the input quantity and the output quantity selects a trigonometric function. The horizontal axis of the trigonometric function is the universe of discourse of the input quantity, and the vertical axis is (0,1). After selecting the triangular function, the membership function is directly generated, Each value on the universe of discourse has a corresponding membership value in the membership function;

Formulating fuzzy control rules, when the test error is large, K _p is enhanced and K _i is reduced; when the test error is small, K _p is reduced and K _i is enhanced;

The output quantity obtained by the inference of the two input quantities through the fuzzy control rules is the fuzzy quantity. The fuzzy quantity of the output quantity is de-fuzzy, and the maximum center method is selected as the de-fuzzification method, and the output fuzzy quantity is converted into the fuzzy quantity on the fuzzy universe. The specific value is multiplied by the corresponding scale factor to become the precise value of the output. The precise value of the output plus the initial value of the PI parameter is input to the PI controller as a new PI parameter to complete the adjustment of the current signal.

Further, in the step S2, the test information also includes a voltage signal, first compare the collected voltage signal with the set voltage signal, and when the collected voltage signal is equal to the set voltage signal, then compare the collected voltage signal with the set voltage signal. The collected current signal is compared with the set current signal.

In order to solve the above-mentioned problem in the prior art that the output current of the LED driving power test system is in error with the set standard value due to external electromagnetic interference, and thus the accuracy of the LED driving power test system is not high, a method is provided. The LED lamp driving power test device can improve the control accuracy of the LED driving power test system and reduce the test deviation by fine-tuning the output current of the LED driving power test system.

A kind of LED driving power test device provided by the invention, comprising:

Input module for setting test standards;

The acquisition module is used to collect test information and transmit it to the comparison module;

The comparison module compares the collected test information with the set test standard, where the test information includes a current signal, and if the collected current signal is not equal to the set test standard, the calculation and adjustment module calculates the adjustment amount;

The calculation and adjustment module, if the collected current signal is not equal to the set current signal, the calculation and adjustment module calculates the adjustment amount and sends an adjustment instruction, so that the collected current signal is equal to the set test standard.

Further, the calculation and adjustment module adopts the method as claimed in claim 2 to calculate the adjustment amount.

In order to solve the above-mentioned problem in the prior art that the output current of the LED driving power test system is in error with the set standard value due to external electromagnetic interference, and thus the accuracy of the LED driving power test system is not high, a method is provided. The LED lamp drive power test system improves the control accuracy of the LED drive power test system and reduces the test deviation by fine-tuning the output current of the LED drive power test system.

A test system for an LED driving power supply provided by the present invention includes:

LED drive power to be tested;

a data acquisition unit, the data acquisition unit is connected to the LED driving power supply to be tested, and is used to collect the current signal of the LED driving power supply to be tested and send it to the control unit;

a power consumption unit, the power consumption unit is respectively connected to the LED driving power supply to be tested and the data acquisition unit, and the power consumption unit controls the magnitude of the current acquired by the data acquisition unit according to the feedback signal of the data acquisition unit;

a control unit, the control unit includes a parameter setting module and a fuzzy controller, the parameter setting module is used to set a test standard, and the fuzzy controller is used to judge whether the collected current signal is equal to the set test standard , if they are not equal, calculate the adjustment amount and send it to the data collection unit, the data collection unit sends the adjustment amount to the power consumption unit, and the power consumption unit adjusts the current size obtained by the data collection unit according to the adjustment amount and makes It is equal to the test standard value.

Further, the control unit also includes:

The data display module is used to display the measured working voltage, working current, on-voltage and inherent resistance of the LED driving power supply.

Further, the data collection unit includes:

The voltage signal acquisition module is used to collect the voltage signal of the LED driving power supply to be tested;

The current signal acquisition module is used to collect the current signal of the LED driving power supply to be tested;

a data acquisition card, the data acquisition card is connected to the control unit and the power consumption unit respectively, transmits the collected voltage and current signals to the control unit, and receives the control signal of the control unit and transmits it to the power consumption unit unit.

Further, the data acquisition unit further includes a signal conditioning module, which is used to adjust the collected voltage and current signals and transmit them to the data acquisition card.

Further, the power consumption unit includes:

a switching element, the linear region of the switching element is used as a variable resistor, and the internal resistance is changed by controlling the conduction amount of the switching element to control the magnitude of the current;

The driving circuit is connected with the data acquisition card and the switch element respectively, and is used for receiving the control signal transmitted by the data acquisition card and controlling the switch element.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention discloses a method for testing an LED lamp driving power supply. By adopting a fuzzy control method, the output signal of the testing system is controlled within a set value range, which solves the influence of the external electromagnetic interference on the LED driving power testing system in the prior art. It is easy to cause the problem that the accuracy of the test results is not high, thereby improving the test accuracy of the LED drive power test system;

2. An LED lamp driving power test system disclosed by the present invention adopts a power consumption unit to connect a signal acquisition unit, and the field effect transistor in the power consumption unit controls the current size obtained by the current acquisition module according to the feedback signal of the data acquisition unit;

3. The LED lamp driving power test system disclosed by the present invention can use software settings to select and save the parameters of this time for direct calling in the next test, thereby reducing the workload of testers;

4. The LED lamp driving power test system disclosed by the present invention solves the problem of no warning in the test results in the prior art by comparing whether the collected voltage signal is a set standard value, and if it is not the set standard value, an alarm is issued , so as to remind the tester to pay attention.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a flowchart of a method for testing an LED driving power supply provided by an embodiment of the present invention;

2 is a schematic structural diagram of an LED driving power test system provided by an embodiment of the present invention;

3 is an overall circuit diagram of a test system for an LED driving power supply provided by an embodiment of the present invention;

4 is a circuit diagram of a voltage acquisition module provided by an embodiment of the present invention;

5 is a circuit diagram of a current acquisition module provided by an embodiment of the present invention;

FIG. 6 is a circuit diagram of a power consumption unit provided by an embodiment of the present invention;

FIG. 7 is a connection diagram of an interface of a data acquisition card of an LED driving power test system according to an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be more thoroughly understood, and will fully convey the scope of the present invention to those skilled in the art.

As an embodiment of the present invention, FIG. 1 shows a flowchart of an LED driving power test method according to an embodiment of the present invention. The method is suitable for an LED driving power test system. LED drive power test standard values (current value, voltage value and resistance coefficient), compare the signal collected by the voltage and current acquisition module with the set standard value, and judge whether the collected current signal is within the set standard value range. If the collected current signal is not within the set setting range, the micro-adjustment signal is output. Specifically, the method is as follows:

S1: Set the test standard value;

S2: Obtain test information, the test information includes the current signal, if the collected current signal is not equal to the set test standard, calculate the adjustment amount and adjust the collected current signal;

S3: The collected current signal is adjusted by the fuzzy control method, so that the collected current signal is equal to the set test standard.

Further, the present invention adopts the fuzzy control method to calculate the adjustment amount to fine-tune the current signal, so that the collected current signal is equal to the set test standard value, and the accuracy of the test system is improved. The fuzzy controller calculates the adjustment amount, and the fuzzy control method includes:

Select a two-dimensional control structure to determine the input and output of the fuzzy control. The input of the fuzzy control is configured as the error e of the input current and the rate of change of the error e ec, and the output of the fuzzy control is configured as the change of the collected circuit signal. quantity e(t) is the input current error value corresponding to the time point, K _p is the proportional coefficient, K _i is the integral coefficient, adjust K _p and K _i to adjust the output current; The obtained current value is subtracted from the set current value, that is, the error e=I _setting -I _sampling ; the change rate ec of the above error is the error derivation value;

Set the fuzzy subset of the input and output language values of fuzzy control to {NB, NM, NS, ZO, PS, PM, PB}, and set the domain of input to [-6,-5,-4,- 3,-2,-1,0,1,2,3,4,5,6], set the fuzzy domain of the output to [-1,1], and then add the input and output membership functions;

The membership function of the input and output quantities selects the trigonometric function. The horizontal axis of the trigonometric function is the universe, and the vertical axis is (0, 1). After selecting the triangular function, the membership function can be directly generated. Each value on the universe is in There are corresponding membership values in the membership function;

Formulating fuzzy control rules, when the test error is large, K _p is enhanced and K _i is reduced; when the test error is small, K _p is reduced and K _i is enhanced;

The output quantity obtained by the inference of the two input quantities through the fuzzy control rules is the fuzzy quantity. The fuzzy quantity of the output quantity is defuzzified, and the maximum center method is selected as the defuzzification method, and the output fuzzy quantity is converted into a specific value on the fuzzy universe. , and multiplied by the corresponding scale factor to become the precise quantity of the output quantity. The precise quantity of the output quantity plus the initial value of the PI parameter is input to the PI controller as a new PI parameter to complete the adjustment of the primary current signal.

Specifically, the above scale factor is the total gain of the fuzzy controller, and is a parameter of the defuzzification module of the fuzzy controller. (Adjustment process: The initial value can be set to 1. If the dynamic response process of the system is too long, the scale factor will be increased. If the system oscillates significantly, the scale factor will be reduced.) The above scale factor is K _pf , and the scale factor is calculated as

K _pf =ΔK _p maximum/domain maximum.

Specifically, the above-mentioned PI parameters refer to the proportional coefficient and the integral coefficient within the fuzzy control.

Further, in the above-mentioned step S2, the test information also includes a voltage signal. First, the collected voltage signal is compared with the set voltage signal. When the collected voltage signal is equal to the set voltage signal, the collected voltage signal is then collected. The current signal of the test system is compared with the set current signal; when the collected voltage signal is not equal to the set voltage signal, the alarm indicator on the front panel of the computer LabVIEW platform will light up to prevent the LED drive power supply from being damaged due to excessive output voltage of the test system. Or because the output voltage of the test system is too small, the test results of the LED drive power supply are affected.

As an embodiment of the present invention, the present invention provides a kind of LED drive power test device, applied to the above-mentioned LED drive power test method, the device comprises:

Input module for setting test standards;

The acquisition module is used to collect test information and transmit it to the comparison module;

The comparison module compares the collected test information with the set test standard. The test information includes the current signal. If the collected current signal is not equal to the set test standard, the calculation and adjustment module calculates the adjustment amount;

The calculation and adjustment module, if the collected current signal is not equal to the set current signal, the calculation and adjustment module calculates the adjustment amount and sends an adjustment instruction, so that the collected current signal is equal to the set test standard.

Further, the calculation and adjustment module adopts the above-mentioned fuzzy control method to calculate the adjustment amount.

As an embodiment of the present invention, the present invention provides an LED driving power test system, which is applied to the above-mentioned LED driving power test method. As shown in FIG. 2 , the system includes a data acquisition unit, a power consumption unit and a control unit, wherein, The data acquisition unit is connected to the LED driving power supply to be tested, and is used to collect the information of the LED driving power supply to be tested. The power consumption unit is respectively connected to the LED driving power supply to be tested and the data acquisition unit. The power consumption unit controls the data acquisition unit according to the feedback signal of the data acquisition unit. The obtained current size, the control unit includes a parameter setting module and a fuzzy controller, the parameter setting module is used to set the test standard, and the set test standard values are the operating point voltage, the operating point current and the operating point resistivity, fuzzy control The device is used to judge whether the collected current signal is equal to the set test standard, if not, calculate the adjustment amount and send it to the data acquisition unit, the data acquisition unit sends the adjustment amount to the power consumption unit, and the power consumption unit according to the adjustment amount Adjust the current obtained by the data acquisition unit and make it equal to the test standard value.

Further, the control unit further includes a data display module for displaying the measured operating voltage, operating current, on-voltage and inherent resistance of the LED driving power supply.

As a specific embodiment of the present invention, as shown in FIG. 2 , the data acquisition unit includes a voltage signal acquisition module, a current signal acquisition module and a data acquisition card. The voltage signal acquisition module is connected to the LED driving power supply to be tested, and is used to collect the LED driver to be tested. The voltage signal of the power supply, the current signal acquisition module is connected to the LED driving power supply to be tested, and is used to collect the current signal of the LED driving power supply to be tested. The data acquisition card is connected to the control unit and the power consumption unit, and the collected voltage and current signals are transmitted to the control unit. unit, and receive the control signal from the control unit and transmit it to the power consumption unit.

Specifically, as a specific example of the voltage acquisition module in the embodiment of the present invention, as shown in B in FIG. 3 , B is the voltage acquisition module, and the enlarged view of B refers to FIG. 4 , the voltage acquisition module includes an operational amplifier U ₁ , a resistor R _a and resistor R _b , one end of the resistor R _a and the resistor R _b in series is connected to the drain of the field effect transistor Q ₁ , the other end of the resistor R _a and the resistor R _b in series is grounded, and the resistor R _a and the resistor R _b are composed of Voltage divider circuit, the voltage of the resistor R _b is used as the input signal _of the operational amplifier U1, the operational amplifier U1 constitutes _a voltage follower, the output end _of the operational amplifier U1 is connected to the AI0 pin of the data acquisition card, and the output voltage of the test system is collected by the voltage After the module is processed, the output voltage meets the voltage acquisition range of the data acquisition card, and the voltage processed by the voltage acquisition module U _output is the output voltage of the LED driving power supply (ie, the output voltage of the test system).

Preferably, at least one adjustable resistor can be configured in the voltage dividing circuit of the voltage acquisition module, so that the voltage acquisition module is suitable for regulating the output voltages of various test systems. The output end of the voltage acquisition module is connected to the AI0 port of the data acquisition card. The voltage acquisition module adjusts the collected output voltage of the LED drive power supply to be tested (scaled up or down) and outputs a signal that meets the analog range of the data acquisition card. Adjust accordingly. After the latter voltage is transmitted to the control unit, it is reduced or enlarged by the control unit and then compared with the set voltage.

Specifically, as a specific example of the current acquisition module in the embodiment of the present invention, as shown in C in FIG. 3 , C is the current acquisition module, and an enlarged view of C refers to FIG. 5 , the current acquisition module includes a resistor R ₄ , an operational amplifier U ₅ , resistor R _b1 , resistor R _b2 , resistor R _b3 and resistor R _b4 , one end of the resistor R ₄ is connected to the source stage of the field effect transistor Q ₁ , and the other end of the resistor R ₄ is connected to the negative electrode of the LED driving power supply to be tested. When the tube Q1 is turned _on , the voltage across the resistor _R4 is equal to the output voltage of the test system, and the current of the resistor _R4 is the output current of the test system, that is, the output current of the test system At the same time, both ends of the resistor R ₄ are respectively connected to the non-inverting input terminal and the reverse input terminal of the operational amplifier U ₅ . The operational amplifier U ₅ , the resistor R _b1 , the resistor R _b2 , the resistor R _b3 and the resistor R _b4 form a subtractor, and the operational amplifier U ₅ The output end of the data acquisition card is connected to the AI1 pin of the data acquisition card, and the collected current is transmitted to the data acquisition card. After calculation, the collected current I _sampling = I _output .

Specifically, as a specific example of the data acquisition card in the embodiment of the present invention, as shown in FIG. 7 , the data acquisition card can select different analog ranges according to needs. The data acquisition card of the present invention adopts USB-3102A, and the analog The measurement range is plus or minus 10V, the data acquisition card is connected to the control unit through the USB interface, and the data acquisition card is connected to the voltage acquisition module, the current acquisition module and the drive circuit. Specifically, the control signal of the control unit is output to the data acquisition card via the USB port, the control signal is transmitted to the driving circuit via the AO1 port of the data acquisition card, the output voltage of the data acquisition card is configured as the input voltage V _ref , the control signal is driven by After the circuit is adjusted, the output voltage meets the working voltage of the LED driving power supply to be tested.

Preferably, the signal acquisition unit further includes a signal conditioning module, which is used to adjust the collected voltage and current signals and transmit them to the data acquisition card; the input and output ends of the data acquisition card can be respectively equipped with a signal conditioning module to adjust the signals output by other modules. Conditioning is a signal that can be collected by the data acquisition card, and at the same time, the signal output by the data acquisition card is conditioned into a signal that can be used for the normal operation of the subsequent modules. The voltage acquisition module, the current acquisition module and the driving circuit of the present invention have the function or configuration of signal conditioning The signal conditioning module works to adjust the input and output signals of the data acquisition card.

As an embodiment of the present invention, the power consumption unit includes a switching element and a driving circuit, wherein the linear region of the switching element is used as a variable resistor, and the internal resistance is changed by controlling the conduction amount of the switching element to control the magnitude of the output current, and the driving circuit is connected to the data The acquisition card and the switch element are used to receive the control signal transmitted by the data acquisition card and control the switch element.

Specifically, as a specific example of the power consumption unit in the embodiment of the present invention, as shown in A in FIG. 3 , A is the power consumption unit. Refer to FIG. 6 for an enlarged view of A. The power consumption unit is composed of a driving circuit and a field effect. It is composed _of tube Q1, wherein the driving circuit includes operational amplifier _U2 , operational amplifier _U3 , operational amplifier _U4 , resistor _R2 , resistor _R3 , resistor _R5 and resistor _R6 .

Specifically, the resistor R ₂ , the resistor R ₃ and the operational amplifier U ₂ form an inverse proportional operational amplifier, the inverting input terminal of the operational amplifier U ₂ is connected to the data acquisition card through the resistor R ₂ , and the non-inverting input terminal of the operational amplifier U ₂ is grounded, _The output end of the operational amplifier U2 is connected to the inverting input end of the operational amplifier _U4 via the resistor _R5 , the resistor R6 and the operational amplifier _U4 constitute an inverse proportional operational amplifier, and the two ends of the resistor _R6 are respectively connected to the inverting input end of the operational amplifier _{U4 .} Inverting input terminal and output terminal, the non-inverting input terminal of operational amplifier U ₄ is grounded, therefore, operational amplifier U ₂ and operational amplifier U ₄ form a multiplier, and the output terminal of operational amplifier U ₄ is connected to the non-inverting input terminal of operational amplifier U ₃ . The amplifier _U3 constitutes a voltage follower, the output end of the operational amplifier _U3 is connected to the gate _of the field effect transistor Q1, and the input voltage _Vref is output to the field effect transistor through the operational amplifier _U2 , the operational amplifier _U3 and the operational amplifier _{U4 The} gate of Q1, the source _of the field effect transistor Q1 is used as the output end of the test system to connect the LED driving power supply to be tested, then the voltage _of the gate of the field effect transistor Q1

When the output voltage of the driving circuit is greater than or equal to the operating voltage of the LED driving power supply to be tested, the field effect transistor Q1 is turned _on , and the output voltage of the test system is equal to the gate voltage _of the field effect transistor Q1, namely When the output voltage of the driving circuit is lower than the working voltage of the LED driving power supply to be tested, the field effect transistor Q1 is turned off, and the output voltage _of the testing system is 0.

In order to make the drive circuit work better, the drive circuit of the present invention is also configured with capacitor C ₁ , capacitor C ₂ , capacitor C ₃ and capacitor C ₄ , and the two ends of capacitor C ₁ are respectively connected to the inverting input terminal of operational amplifier U ₂ and The output terminal, the _two ends of the capacitor C2 are respectively connected to the inverting input terminal and the output terminal of the operational amplifier _U4 , the _two ends of the capacitor C3 are respectively connected to the negative power supply VEE and the ground, and the two ends of the capacitor _C4 are respectively connected to the positive power supply VCC and Ground, the positive power supply VCC and the negative power supply VEE respectively power the operational amplifier U ₂ , the operational amplifier U ₃ and the operational amplifier U ₄ .

Preferably, at least one resistor in the driving circuit and the operational amplifier can be configured as an adjustable resistor, so that the test system is suitable for testing LED driving power supplies with different parameters.

The working principle of the present invention is as follows:

On the front panel of the computer LabVIEW platform, set the values of voltage, current and LED resistivity required for the test, and then the control unit outputs the control signal to the data acquisition card through the USB interface, the data acquisition card is connected to the driving circuit, and the control signal is output after the driving circuit. Connect the gate of the FET Q1, the drain of the FET Q1 is connected to the LED driving power supply to be tested, the voltage acquisition module is connected to the drain of the FET Q1, the voltage acquisition module collects the output voltage of the test system and transmits it to the data acquisition card, The data acquisition card transmits the output voltage to the control unit, and the control unit compares the collected voltage signal with the set voltage signal. If the collected voltage signal is consistent with the set voltage signal, it continues to compare the collected current signal Whether it is consistent with the set current signal, if the current signal is consistent, continue to collect the signal for comparison, if the current signal is inconsistent, the control unit calculates the adjustment amount through the fuzzy controller to fine-tune the collected current signal. If the set voltage signal is inconsistent, the alarm light on the front panel of the control unit will light up, then reset the voltage signal on the front panel, and then carry out the test.

To sum up, the method, device and system for testing an LED driving power supply disclosed in the present invention can realize fine-tuning of the output current of the LED driving power testing system, thereby solving the instability of the LED driving power testing system caused by the influence of external electromagnetic interference. This improves the accuracy of the test results of the LED drive power supply.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

Memory may include non-persistent memory in computer readable media, random access memory (RAM) and/or non-volatile memory in the form of, for example, read only memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.

Computer-readable media includes both persistent and non-permanent, removable and non-removable media, and storage of information may be implemented by any method or technology. Information may be computer readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Flash Memory or other memory technology, Compact Disc Read Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cartridges, magnetic tape disk storage or other magnetic storage devices or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals and carrier waves.

The above are merely examples of the present application, and are not intended to limit the present application. Various modifications and variations of this application are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims (10)

1. a kind of LED drive power test method characterized by comprising

S1: setting testing standard value；

S2: obtaining test information, and the test information includes current signal, if collected current signal is not equal to the survey of setting Test-object is punctual, then calculates adjustment amount and adjust collected current signal；

S3: collected current signal is adjusted using fuzzy control method, collected current signal is made to be equal to the test of setting Standard.

2. a kind of LED drive power test method according to claim 1, which is characterized in that the mould in the step S3 Fuzzy control method includes:

Two dimensional control structure is chosen, determines that the input quantity and output quantity of fuzzy control, the input quantity of the fuzzy control are configured to The error e of input current and the change rate ec of error e, the output quantity of the fuzzy control are configured to the variable quantity of current signal E (t) is time point corresponding input current error amount, K_pFor ratio system Number, K_iFor integral coefficient, K is adjusted_pAnd K_iTo adjust output quantity；

The fuzzy subset of input quantity and output quantity Linguistic Value that the fuzzy control is arranged is { NB, NM, NS, ZO, PS, PM, PB }, The domain that the input quantity is arranged is [- 6, -5, -4, -3, -2, -1,0,1,2,3,4,5,6], and the fuzzy of the output quantity is arranged Domain is [- 1,1], then adds input quantity and output quantity subordinating degree function；

The subordinating degree function of input quantity and output quantity selects trigonometric function, and the horizontal axis of trigonometric function is the domain of the input quantity, The longitudinal axis is (0,1), and the subordinating degree function after the triangular function is selected to directly generate, each value on the domain exists Have in the subordinating degree function and corresponding is subordinate to angle value；

Fuzzy control rule is formulated, when test error is big, enhances K_p, reduce K_i, and when test error is smaller, reduce K_p, enhancing K_i；

The output quantity that two input quantities are obtained through fuzzy control rule reasoning is fuzzy quantity, is carried out to the fuzzy quantity of the output quantity Ambiguity solution chooses maximum value center method as ambiguity solution method, output fuzzy quantity is converted to the particular value on fuzzy domain, together When become the accurate amount of output quantity multiplied by corresponding scale factor, the accurate amount of the output quantity adds the conduct of PI initial parameter value New PI parameter is input to PI controller, to complete the adjustment of primary current signal.

3. a kind of LED drive power test method according to claim 1, it is characterised in that: described in the step S2 Testing information further includes voltage signal, is first compared collected voltage signal with the voltage signal of setting, works as acquisition When the voltage signal arrived is equal to the voltage signal of setting, then the current signal of collected current signal and setting is compared Compared with.

4. a kind of LED drive power test device characterized by comprising

Input module, for setting testing standard；

Acquisition module for collecting test information and is transferred to comparison module；

Collected test information is compared by comparison module with the testing standard of setting, and the test information includes electric current Signal calculates adjustment amount by calculating adjustment module if collected current signal is not equal to the testing standard set；

Adjustment module is calculated, if collected current signal is not equal to the current signal set, calculating adjustment module, which calculates, to be adjusted Whole amount simultaneously sends adjustment instruction, and collected current signal is made to be equal to the testing standard of setting.

5. LED drive power test device according to claim 4, it is characterised in that: the calculating adjustment module uses Method according to claim 2 carries out calculating adjustment amount.

6. a kind of LED drive power test macro characterized by comprising

LED drive power to be measured；

Data acquisition unit, the data acquisition unit connects LED drive power to be measured, for acquiring LED drive power to be measured Current signal and be sent to control unit；

Power dissipating unit, the power dissipating unit are separately connected LED drive power to be measured and the data acquisition unit, institute It states power dissipating unit and the size of current that data acquisition unit obtains is controlled according to the feedback signal of the data acquisition unit；

Control unit, described control unit include parameter setting module and fuzzy controller, and the parameter setting module is for setting Determine testing standard, the fuzzy controller is for judging whether collected current signal is equal with the testing standard of setting, such as Fruit is unequal, then calculates adjustment amount and be sent to data acquisition unit, and adjustment amount is sent to described by the data acquisition unit Power dissipating unit, the power dissipating unit according to adjustment amount adjust data acquisition unit obtain size of current and be allowed to Testing standard value is equal.

7. a kind of LED drive power test macro according to claim 6, which is characterized in that described control unit is also wrapped It includes:

Data disaply moudle, for showing the operating voltage, operating current of the LED drive power measured, conducting voltage and intrinsic Resistance.

8. a kind of LED drive power test macro according to claim 6, which is characterized in that the data acquisition unit Include:

Voltage signal acquisition module, for acquiring the voltage signal of LED drive power to be measured；

Current signal collection module, for acquiring the current signal of LED drive power to be measured；

Data collecting card, the data collecting card are separately connected described control unit and the power dissipating unit, adopt described The voltage and current signal collected is transferred to control unit, and the control signal of reception control unit is transferred to the power consumption Unit.

9. a kind of LED drive power test macro according to claim 6, which is characterized in that the data acquisition unit It further include signal conditioning module, for data collecting card will to be transferred to after the collected voltage and current signal adjustment.

10. a kind of LED drive power test macro according to claim 6, which is characterized in that the power dissipating unit Include:

Switch element, the linear zone of the switch element are made interior as variable resistance by the control switching elements conductive amount Resistance changes to control size of current；

Driving circuit, the driving circuit are separately connected data collecting card and the switch element, for receiving data capture card The control signal of transmission simultaneously controls the switch element.