VARIABLE FREQUENCY CONVERTER AND ADJUSTING METHOD FOR THE SAME

• US 20140085936A1
• Filed: 09/25/2012
• Published: 03/27/2014
• Est. Priority Date: 09/25/2012
• Status: Abandoned Application

• Current Assignee: Delta Electronics Company Limited (Delta Electronics Incorporated)
• Original Assignee: Delta Electronics Company Limited (Delta Electronics Incorporated)
• Inventors: Jin, Hongyuan, Zhou, Jinping, Gan, Hongjian, Ying, Jianping, Ge, Tao, Hu, Peiqing
• Application Number:
  US13/626,384
• Publication Number:
  US 20140085936A1
• Time in Patent Office: Days
• US Class Current: 363/16
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02M 3/33507 with automatic control of the output voltage or current, e.g. flyback converters H02M3/33561, H02M3/33569 take precedence

Abstract

A variable frequency converter and an adjusting method for the same are provided in the present application. The variable frequency converter operates in a variable frequency mode, and comprises a power stage circuit module and a variable frequency signal stage circuit module which are connected to form a closed-loop circuit system. The variable frequency converter further comprises an adjusting unit outputting a continuous interfering signal and loading the continuous interfering signal into the variable frequency signal stage circuit module so as to cause operating frequency of the power stage circuit module controlled by the variable frequency signal stage circuit module to change continuously. In the present application, in the variable frequency converter, the EMI peak value is decreased.

Claims

1. A variable frequency converter operating in a variable frequency mode, comprising:

a power stage circuit module and a variable frequency signal stage circuit module which are connected with each other to form a closed-loop circuit system;

wherein the variable frequency converter further comprises an adjusting unit outputting a continuous interfering signal and loading the continuous interfering signal into the variable frequency signal stage circuit module so as to cause an operating frequency of the power stage circuit module controlled by the variable frequency signal stage circuit module to change continuously.

2. The variable frequency converter according to claim 1, wherein the adjusting unit is a jitter signal generator outputting the continuous interfering signal to the variable frequency signal stage circuit module.

3. The variable frequency converter according to claim 2, wherein the variable frequency signal stage circuit module comprises a detection stage circuit detecting the power stage circuit module, and a control stage circuit receiving a signal outputted by the detection stage circuit and outputting a signal to the power stage circuit module, the signal outputted by the jitter signal generator is loaded into the detection stage circuit.

4. The variable frequency converter according to claim 3, wherein the detection stage circuit comprises an input detection stage circuit and an output detection stage circuit, the signal outputted by the jitter signal generator is loaded into the input detection stage circuit so as to cause the output signal of the input detection stage circuit or the signal of the input detection stage circuit transferred to the control stage circuit to jitter continuously.

5. The variable frequency converter according to claim 3, wherein the detection stage circuit comprises an input detection stage circuit and an output detection stage circuit, the signal outputted by the jitter signal generator is loaded into the output detection stage circuit so as to cause the output signal of the output detection stage circuit or the signal of the output detection stage circuit transferred to the control stage circuit to jitter continuously.

6. The variable frequency converter according to claim 2, wherein the variable frequency signal stage circuit module comprises a detection stage circuit and a control stage circuit, the detection stage circuit detects the power stage circuit module and outputs a signal to the control stage circuit, the control stage circuit outputs a signal to the power stage circuit module, the signal outputted by the jitter signal generator is loaded into the control stage circuit so as to cause the output signal of the control stage circuit or the signal of the control stage circuit transferred to the power stage circuit module to jitter continuously.

7. The variable frequency converter according to claim 6, wherein the control stage circuit comprises a feedback control circuit and a driving apparatus, the feedback control circuit receives the signal outputted by the detection stage circuit and outputs a signal to the driving apparatus, the signal outputted by the jitter signal generator is loaded into the output signal of the feedback control circuit.

8. The variable frequency converter according to claim 1, wherein the variable frequency signal stage circuit module comprises a detection stage circuit and a control stage circuit, the detection stage circuit comprises an input detection stage circuit and an output detection stage circuit, the adjusting unit is electrically connected to the input detection stage circuit.

9. The variable frequency converter according to claim 8, wherein the adjusting unit comprises an adjusting element connected to the input detection stage circuit, and an adjusting element controller matched with the adjusting element, the adjusting element controller controls the parameter of the adjusting element to continuously change with time so as to load the continuous interfering signal into the input detection stage circuit.

10. The variable frequency converter according to claim 8, wherein the adjusting element is a variable resistor, the adjusting element controller is a variable resistor controller.

11. The variable frequency converter according to claim 1, wherein a frequency of the continuous interfering signal is higher than a crossover frequency of the closed-loop circuit system.

12. The variable frequency converter according to claim 11, wherein the continuous interfering signal is a voltage waveform or a current waveform which is periodical or non-periodical and whose amplitude is constant or variable.

13. An adjusting method for a variable frequency converter comprising a power stage circuit module and a variable frequency signal stage circuit module which are connected with each other to form a closed-loop circuit system, comprising:

setting an adjusting unit in the variable frequency converter, loading a continuous interfering signal generated by the adjusting unit into the output signal of the variable frequency signal stage circuit module and transferring the output signal of the variable frequency signal stage circuit module to the power stage circuit module, so as to cause output of the variable frequency converter to jitter and expand the operating frequency range of the variable frequency converter.

14. The adjusting method according to claim 13, wherein the adjusting unit is a jitter signal generator and loads the continuous interfering signal generated by the jitter signal generator into the variable frequency signal stage circuit module.

15. The adjusting method according to claim 13, wherein the variable frequency signal stage circuit module comprises an input detection stage circuit and a control stage circuit, the input detection stage circuit outputs a signal to the control stage circuit, the adjusting unit comprises an adjusting element connected to the input detection stage circuit, and an adjusting element controller matched with the adjusting element, the parameter of the adjusting element is controlled to continuously change with time under the control of adjusting element controller so as to load the continuous interfering signal into the output signal of the input detection stage circuit or the signal of the input detection stage circuit transferred to the control stage circuit.

16. The adjusting method according to claim 13, wherein a frequency of the continuous interfering signal is higher than a crossover frequency of the closed-loop circuit system.

17. The adjusting method according to claim 16, wherein the continuous interfering signal is a voltage waveform or a current waveform which is periodical or non-periodical and whose amplitude is constant or variable.

18. A variable frequency converter comprising a power stage circuit module and a variable frequency signal stage circuit module which are connected with each other to form a closed-loop circuit system, further comprising an adjusting unit connected to the power stage circuit module, the adjusting unit is able to change resonance parameter of the power stage circuit module so as to cause the operating frequency of the power stage circuit module to change continuously.

19. The variable frequency converter according to claim 18, wherein the adjusting unit at least comprises an adjusting element and an adjusting element controller matched with the adjusting element, the adjusting element is connected to the power stage circuit module, the adjusting element controller controls the parameter of the adjusting element to continuously change with time.

20. The variable frequency converter according to claim 19, wherein the adjusting element is a variable capacitor, the variable capacitor is connected to the power stage circuit module, and the adjusting element controller is a variable capacitor controller.

21. The variable frequency converter according to claim 19, wherein the adjusting element is a variable inductor connected to the power stage circuit module, and the adjusting element controller is a variable inductor controller.

22. The variable frequency converter according to claim 19, wherein the adjusting element is a combination of a variable capacitor and a variable inductor, the adjusting element controller controls parameter of the variable capacitor and/or the variable inductor to continuously change with time.