Means of providing variable reactive load capability on an electronic load

• US 8,664,921 B2
• Filed: 08/04/2011
• Issued: 03/04/2014
• Est. Priority Date: 08/04/2011
• Status: Expired due to Fees

• Current Assignee: Tektronix Incorporated (Fortive Corp.)
• Original Assignee: Tektronix Incorporated (Fortive Corp.)
• Inventors: Hiltner, David F.
• Primary Examiner(s): Berhane, Adolf
• Assistant Examiner(s): Pham, Emily P
• Application Number:
  US13/197,999
• Publication Number:
  US 20130033239A1
• Time in Patent Office: 943 Days
• Field of Search: 323/208, 324/73.1, 324/750.02, 324/764.01, 32476101-76205, 703 13- 15
• US Class Current: 323/208
• CPC Class Codes: G01R 31/40 Testing power supplies testing photovoltaic devices H02S50/10
• CPC Class Codes: H02S 50/10 Testing of PV devices, e.g. of PV modules or single PV cells testing of semiconductor devices during manufacturing H01L22/00
• CPC Class Codes: H03H 7/38 Impedance-matching networks
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy

Abstract

Embodiments of the invention include an electronic load having variable reactive load capability and techniques for controlling and/or modeling a reactive component in a load. The electronic load can include a user interface through which a latency value is received from a user. A delay is created based on the latency value between the time that a variable of the input signal is sensed and the time that a variable of the input signal is driven to a new value, thereby simulating a reactive component in the electronic load based on the created delay. In one example embodiment, the driven variable can be stepped after the created delay to produce an approximation of a capacitive or inductive element. In another example embodiment, the driven variable can be slewed during the delay period using an arbitrary waveform generator, thereby more accurately simulating the reactive component.

Claims

1. A method for providing variable reactive load capability on an electronic load, the method comprising:

receiving a latency value through a user interface of the electronic load;

receiving an input signal at one or more input terminals of the electronic load;

sensing a voltage of the input signal;

adjusting, using a power dissipating element, a current of the input signal from a first current value to a second current value in response to the sensed voltage; and

creating a delay based on the latency value input through the user interface between the time that the voltage of the input signal is sensed and the time that the power dissipating element adjusts the current to the second current value.

2. The method of claim 1, further comprising:

simulating a reactive component in the electronic load based on the created delay.

3. The method of claim 2, wherein the reactive component is inductive.

4. The method of claim 1, wherein creating the delay further comprises:

slewing the shape of a current versus time waveform between the first and second current values.

5. The method of claim 4, wherein slewing the shape further comprises:

shaping the current versus time waveform using an arbitrary waveform generator.

6. A method for providing variable reactive load capability on an electronic load, the method comprising:

receiving a latency value through a user interface of the electronic load;

receiving an input signal at one or more input terminals of the electronic load;

sensing a current of the input signal;

adjusting, using a power dissipating element, a voltage of the input signal from a first voltage value to a second voltage value in response to the sensed current; and

creating a delay based on the latency value input through the user interface between the time that the current of the input signal is sensed and the time that the power dissipating element adjusts the voltage to the second voltage value.

7. The method of claim 6, further comprising:

simulating a reactive component in the electronic load based on the created delay.

8. The method of claim 7, wherein the reactive component is capacitive.

9. The method of claim 6, wherein creating the delay further comprises:

slewing the shape of a voltage versus time waveform between the first and second voltage values.

10. The method of claim 9, wherein slewing the shape further comprises:

shaping the voltage versus time waveform using an arbitrary waveform generator.

11. An electronic load, comprising:

one or more input terminals to receive an input signal;

a user interface configured to receive a latency value;

a first conditioning section configured to sense a first characteristic of the input signal;

a second conditioning section configured to sense a second characteristic of the input signal;

a power dissipating element configured to adjust one of the first and second characteristics of the input signal based on the other characteristic; and

a computational device coupled to the power dissipating element and operable to receive the latency value, wherein the computational device includes reactive component simulation logic configured to create a delay in the power dissipating element based on the latency value received through the user interface.

12. The electronic load of claim 11, wherein the reactive component simulation logic is configured to create the delay between the time that one of the characteristics of the input signal is sensed and the time that the power dissipating element finishes adjusting the other characteristic so that a reactive component is simulated in the electronic load.

13. The electronic load of claim 11, wherein:

the first conditioning section is a current conditioning section;

the second conditioning section is a voltage conditioning section;

the first characteristic is a current value of the input signal; and

the second characteristic is a voltage value of the input signal.

14. An electronic load, comprising:

one or more input terminals to receive an input signal;

a user interface configured to receive a latency value;

a current conditioning section configured to sense a current value of the input signal;

a voltage conditioning section configured to sense a voltage value of the input signal;

a power dissipating element configured to adjust one of the current value and the voltage value of the input signal based on the other one of the current value and the voltage value; and

a computational device coupled to the power dissipating element, wherein the computational device includes reactive component simulation logic configured to cause the power dissipating element to create a delay between the time that the voltage of the input signal is sensed and the time that the power dissipating element adjusts the current of the input signal so that a reactive component is simulated in the electronic load, the delay based on the latency value received through the user interface.

15. The electronic load of claim 14, wherein the reactive component is inductive.

17. The electronic load of claim 14, wherein the reactive component is capacitive.

16. An electronic load, comprising:

one or more input terminals to receive an input signal;

a user interface configured to receive a latency value;

a current conditioning section configured to sense a current value of the input signal;

a voltage conditioning section configured to sense a voltage value of the input signal;

a power dissipating element configured to adjust one of the current value and the voltage value of the input signal based on the other one of the current value and the voltage value; and

a computational device coupled to the power dissipating element, wherein the computational device includes reactive component simulation logic configured to cause the power dissipating element to create a delay between the time that the current of the input signal is sensed and the time that the power dissipating element adjusts the voltage of the input signal so that a reactive component is simulated in the electronic load, the delay based on the latency value received through the user interface.