CN202083721U

CN202083721U - Fully-passive type programmable electronic load with emulation LED characteristic

Info

Publication number: CN202083721U
Application number: CN 201120195749
Authority: CN
Inventors: 陈帮云
Original assignee: DongGuan TopFer Electronic Technology Co Ltd
Current assignee: DongGuan TopFer Electronic Technology Co Ltd
Priority date: 2011-06-11
Filing date: 2011-06-11
Publication date: 2011-12-21
Anticipated expiration: 2021-06-11

Abstract

The utility model relates to a fully-passive type programmable electronic load with emulation LED characteristics. The fully-passive type programmable electronic load with emulation LED characteristics comprises an embedded control module, a basic power circuit module and an LED characteristic emulation circuit module. The LED characteristic emulation circuit module comprises an LED positive volt-ampere characteristic waveform sampling circuit, a high-frequency and low-frequency AC LED volt-ampere characteristic separating circuit, a high-frequency variable gain amplification circuit, a low-frequency variable gain amplification circuit and a high-speed linearity drive circuit. The high-speed linearity drive circuit is connected with a passive VF control circuit. The basic power circuit module comprises a high-speed power circuit and a VF read-back sampling circuit. According to the utility model, the LED characteristic emulation circuit module, the embedded control module and the basic power circuit are adopted, such that the electronic load can meet test requirements of an ordinary load power supply, and also can emulate work characteristics of a real LED load, thereby satisfying tests of all LED drive power supplies and the like, and obtaining more accurate and reliable test results.

Description

The electronic load of a kind of entirely passive type emulation LED able to programme characteristic

Technical field:

The utility model belongs to the electronic load field, refers in particular to the electronic load of a kind of entirely passive type emulation LED able to programme characteristic.

Background technology:

In the power supply test field, need use electronic load, by the electrical appliance consumed power in the electronic load simulation true environment, cooperate control, the demonstration of PC, corresponding power supply is tested the acquisition test result.

Existing electronic load mainly contains CR, CC, CV, CP, five kinds of mode of operations of pulse in power supply test.And in the test to all LED driving powers, the electronic load that is adopted is to design according to the characteristic of ordinary electronic load, these electronic loads specially do not design according to the characteristic of LED itself, so these electronic loads do not simulate the operating characteristic of LED load in the true environment substantially in the middle operating characteristic of testing.Like this, the test result that test obtains to the LED driving power obviously is inaccurate, insecure.

The utility model content:

The purpose of this utility model is to overcome the defective that existing electronic load can't be simulated true LED loaded work piece characteristic, and a kind of entirely passive type emulation LED able to programme is provided the electronic load of characteristic.

The utility model realizes that the technical scheme that its purpose adopts is: the electronic load of a kind of entirely passive type emulation LED able to programme characteristic, can be used in the test to all LED driving powers, it comprises embedded type control module and prime power circuit module, described electronic load also comprises LED characteristic Simulation circuit module, and this LED characteristic Simulation circuit module comprises LED forward volt-ampere characteristic waveform sampling circuit, high and low frequency AC LED volt-ampere characteristic separation circuit, high frequency variable gain amplifying circuit, low frequency variable-gain amplification circuit, high-speed linear driving circuit; Wherein high frequency variable gain amplifying circuit, low frequency variable-gain amplification circuit are relation in parallel; And described high-speed linear driving circuit also is connected with passive VF control circuit; Described prime power circuit module comprises high-speed power circuit and VF retaking of a year or grade sample circuit.

Be provided with the mode switch element that to switch CR pattern, CC pattern, CV pattern, CP pattern, pulse mode, LED pattern respectively in the described embedded type control module.

Adopt technical scheme described in the utility model, on the basis of original electronic load, by adding LED characteristic Simulation circuit module and to embedded type control module, prime power circuit, make the utility model electronic load not only can satisfy the test request of normal load power supply, more can go out the operating characteristic of true LED load by analog simulation, thereby satisfy test to all LED driving powers etc., and obtain more accurately, more reliable test result, provide the more foundation of science to the development of LED driving power.

Description of drawings:

Fig. 1 is the composition frame chart of the utility model electronic load;

Fig. 2 is the testing process block diagram of the utility model electronic load in power supply test is used;

Embodiment:

As shown in Figure 1, the electronic load of entirely passive type emulation LED characteristic described in the utility model is on the basis of original embedded type control module 1 and prime power circuit module 2, also set up LED characteristic Simulation circuit module 3, this LED characteristic Simulation circuit module 3 comprises LED forward volt-ampere characteristic waveform sampling circuit 31 (being V-I characteristic waveforms sample circuit), high and low frequency AC LED volt-ampere characteristic separation circuit 32, high frequency variable gain amplifying circuit 33, low frequency variable-gain amplification circuit 34, high-speed linear driving circuit 35; Wherein high frequency variable gain amplifying circuit 33, low frequency variable-gain amplification circuit 34 are relation in parallel; And described high-speed linear driving circuit 35 also is connected with passive VF control circuit 36; Described prime power circuit module 2 comprises high-speed power circuit 21 and voltage, electric current retaking of a year or grade sample circuit 22.

Comprise PC communication interface 11, primary processor 12 and the multi-path digital/analog converter DAC 13 that is connected with primary processor 12, multi-channel analog/digital converter ADC 14 and hardware such as display screen, keyboard in the described embedded type control module 1, also be provided with the mode switch element 110 that to switch CR pattern, CC pattern, CV pattern, CP pattern, pulse mode, LED pattern respectively.

In conjunction with shown in Figure 2, adopting the utility model electronic load that power supply or LED are driven when testing, can parameter will be set by panel or computer and pass on by communication interface and instruct the LED electronic load, the alternating-current resistance, the LED that singly connect working ressitance and singly meet LED that sets the tested LED forward threshold voltage of LED electronic load, LED connect altogether quantity, average current limit value, ripple current limit value, high-frequency current limit value etc.; Set earlier during at power supply test that tested power supply drawing when inserting carries that a cut-in voltage, constant voltage point, steady current point, constant power points, constant resistance point, voltage limit value require, current limit requires, the ripple current limit value requires, the high-frequency current limit value requires, the ripple voltage limit value requires, the HF voltage limit value requires, the electric current rate of rise, the electric current rate of rise etc.

1, the various patterns of LED forward volt-ampere characteristic and power supply load principle of work:

The output terminal of tested power supply or LED driving is inserted LED electronic load input end.Send into the LED volt-ampere characteristic waveform sampling circuit 31 and the high-speed power circuit 21 of LED electronic load then respectively.When electronic load is operated in the LED pattern, LED volt-ampere characteristic waveform sampling circuit 31 drives LED the forward VI characteristic low frequency waveform (twice of input terminal voltage frequency of operation of output and LED formation load circuit, direct current is zero), send into high and low frequency LED volt-ampere characteristic separation circuit 32, with the low frequency LED volt-ampere characteristic signal of separating, send into low frequency variable-gain amplification circuit 34 and go adjusting range then; Wherein high frequency variable gain amplifying circuit 33 is also identical with forward VI characteristic low frequency waveform control method.Before sending into high-speed linear driving circuit 35, two signals are combined.And also have one road VF passive control circuit, 36 signals to import thus at the high-speed linear driving circuit, be responsible for absorbing the output voltage of power supply or LED driving, when the LED driving voltage reached the threshold voltage that primary processor 12 sends, this circuit will rise according to electric current after the LED conducting and voltage slope.Voltage, electric current retaking of a year or grade sample circuit 22 are sent low-and high-frequency alternating voltage, DC voltage, low-and high-frequency alternating current, the DC current of sampling into analog-to-digital conversion circuit ADC 14, then the digital signal of conversion is sent into primary processor 12, calculating wherein by primary processor at last, whether parameter meets setting value.Will be if any the deviation primary processor by D/A conversion circuit DAC 13 output corrections, by mode switch element 110 correction is sent into the amplitude that the low-and high-frequency variable-gain amplification circuit goes to adjust AC controling signal again, reach the LED forward AC characteristic purpose consistent at last with setting value.

When power supply test, directly by digital-to-analogue conversion DAC 13 analog quantity that sets is sent into high-speed linear driving circuit 35 by mode switching circuit 110 with configuring the power supply test parameter, the high-speed power circuit of this moment will go to realize various functions according to switching good mode of operation.

The advantage of this circuit: when the output voltage of tested LED driving or power supply is lower than the VF voltage of setting, do not have any pulling load current, any a LED driving or power supply can both thoroughly be started reliably.

4, the LED electronic load is principle of work when match system: this equipment can use separately, also can each will cooperate the equipment of finishing test by the industrial computer centralized control, at this once effect and the job order of each equipment in system testing (Fig. 2) are described.At first need a program control power of alterating and direct current supply 41 when test, it can realize different operating voltage and different operating frequency or direct current, and have overvoltage, the under-voltage protection unit 42 in parallel with it is used to monitor the voltage condition of electrical network simultaneously.The dash current of next step access power analysing and measuring instrument 43 responsible analysis tested products, steady current, tangible power, useful power, power factor (PF), harmonic current, no-load power consumption, efficient or the like; Insert spread measurement unit 44 then and go to realize the automatic switchover of multichannel product test simultaneously, next respectively output terminal is inserted tested LED and drive or the power source voltage input end, be allowed to condition at and start work when voltage automatically switches to corresponding measurement products; Output terminal at each test product all inserts the load of a LED artificial electronic able to programme again, is used for test product is loaded according to real loaded work piece pattern; Can also insert a plug-in expansion oscillograph and voltage and current measurement table 45 this moment at the output terminal of measured LED driving or power supply, is used for making things convenient for the user directly to watch measurement result with eyes when test.After above equipment all connects, send the job order that edits in advance by computer, allow the sequencing of each instrument work when measuring by one of them communication interface deactivation, control, the measurement result of gathering each surveying instrument of GPIB, RS232, USB, LAN, test result is noted be used to inquire about test products and whether meet the requirements.

Claims

1. the electronic load of an entirely passive type emulation LED able to programme characteristic, can be used in the test to professional LED driving power, it comprises embedded type control module (1) and prime power circuit module (2), it is characterized in that: described electronic load also comprises LED characteristic Simulation circuit module (3), and this LED characteristic Simulation circuit module (3) comprises LED forward volt-ampere characteristic waveform sampling circuit (31), high and low frequency AC LED volt-ampere characteristic separation circuit (32), high frequency variable gain amplifying circuit (33), low frequency variable-gain amplification circuit (34), high-speed linear driving circuit (35); Wherein high frequency variable gain amplifying circuit (33), low frequency variable-gain amplification circuit (34) are relation in parallel; And described high-speed linear driving circuit (35) also is connected with passive VF control circuit (36); Described prime power circuit module (2) comprises high-speed power circuit (21) and voltage, electric current retaking of a year or grade sample circuit (22).

2. the electronic load of a kind of entirely passive type according to claim 1 emulation LED able to programme characteristic is characterized in that: be provided with the mode switch element (110) that can switch CR pattern, CC pattern, CV pattern, CP pattern, pulse mode, LED pattern respectively in the described embedded type control module (1).