METHOD FOR CONTROLLING INVERTER APPARATUS BY DETECTING PRIMARY-SIDE OUTPUT AND INVERTER APPARATUS THEREOF

• US 20150244255A1
• Filed: 02/23/2015
• Published: 08/27/2015
• Est. Priority Date: 02/26/2014
• Status: Active Grant

• Current Assignee: FSP Technology Inc.
• Original Assignee: FSP Technology Inc.
• Inventors: Chen, Han-Wei, Yu, Chun-Hao, Liu, Chia-Hua
• Granted Patent: US 9,450,515 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02M 1/0022 the disturbance parameters being input voltage fluctuations
• CPC Class Codes: H02M 1/0032 Control circuits allowing low power mode operation, e.g. in standby mode
• CPC Class Codes: H02M 1/0058 by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02M 7/48 using discharge tubes with control electrode or semiconductor devices with control electrode
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A control method for an inverter apparatus is provided. The inverter apparatus includes a direct current to direct current (DC/DC) converter and a direct current to alternating current (DC/AC) converter. An output side of the DC/DC converter is coupled to an input side of the DC/AC converter. The control method includes the following steps: outputting a DC power from the output side of the DC/DC converter; receiving the DC power from the input side of the DC/AC converter, and generating an AC power from an output side of the DC/AC converter according to the DC power; and detecting the DC power, and accordingly controlling an operation of the DC/AC converter.

Claims

1. A control method for an inverter apparatus, the inverter apparatus comprising a direct current to direct current (DC/DC) converter and a direct current to alternating current (DC/AC) converter, an output side of the DC/DC converter being coupled to an input side of the DC/AC converter, the control method comprising:

outputting a DC power from the output side of the DC/DC converter;

receiving the DC power from the input side of the DC/AC converter, and generating an AC power from an output side of the DC/AC converter according to the DC power; and

detecting the DC power, and accordingly controlling an operation of the DC/AC converter.

2. The control method of claim 1, wherein when it is detected that an energy level of the DC power is less than or equal to a lower bound level, the step of controlling the operation of the DC/AC converter comprises:

turning off the DC/AC converter.

3. The control method of claim 2, wherein after turning off the DC/AC converter, the step of detecting the DC power and accordingly controlling the operation of the DC/AC converter further comprises:

detecting if the energy level of the DC power is greater than or equal to an upper bound level, wherein the upper bound level is greater than the lower bound level; and

when it is detected that the energy level is greater than or equal to the upper bound level, turning on the DC/AC converter.

4. The control method of claim 2, further comprising:

setting the lower bound level according to a rated output power of the DC/AC converter.

5. The control method of claim 2, wherein the energy level is a voltage level.

6. The control method of claim 1, wherein when it is detected that an energy level of the DC power is greater than or equal to an upper bound level, the step of controlling the operation of the DC/AC converter comprises:

turning on the DC/AC converter.

7. The control method of claim 6, wherein after turning on the DC/AC converter, the step of detecting the DC power and accordingly controlling the operation of the DC/AC converter further comprises:

detecting if the energy level of the DC power is less than or equal to a lower bound level, wherein the lower bound level is less than the upper bound level; and

when it is detected that the energy level is less than or equal to the lower bound level, turning off the DC/AC converter.

8. The control method of claim 7, further comprising:

setting the lower bound level according to a rated output power of the DC/AC converter.

9. The control method of claim 6, wherein the energy level is a voltage level.

10. An inverter apparatus, comprising:

a direct current to direct current (DC/DC) converter, arranged for outputting a DC power;

a direct current to alternating current (DC/AC) converter, coupled to the DC/DC converter, the DC/AC converter arranged for receiving the DC power, and generating an AC power according to the DC power; and

a controller, coupled to the DC/AC converter, the controller arranged for detecting the DC power, and accordingly controlling an operation of the DC/AC converter.

11. The inverter apparatus of claim 10, when the controller detects that an energy level of the DC power is less than or equal to a lower bound level, the controller turns off the DC/AC converter.

12. The inverter apparatus of claim 11, wherein after the controller turns off the DC/AC converter, the controller further detects if the energy level of the DC power is greater than or equal to an upper bound level;

the upper bound level is greater than the lower bound level; and

when the controller detects that the energy level is greater than or equal to the upper bound level, the controller turns on the DC/AC converter.

13. The inverter apparatus of claim 11, wherein the controller sets the lower bound level according to a rated output power of the DC/AC converter.

14. The inverter apparatus of claim 11, wherein the energy level is a voltage level.

15. The inverter apparatus of claim 10, when the controller detects that an energy level of the DC power is greater than or equal to an upper bound level, the controller turns on the DC/AC converter.

16. The inverter apparatus of claim 15, wherein after the controller turns on the DC/AC converter, the controller further detects if the energy level of the DC power is less than or equal to a lower bound level;

the lower bound level is less than the upper bound level; and

when the controller detects that the energy level is less than or equal to the lower bound level, the controller turns off the DC/AC converter.

17. The inverter apparatus of claim 16, wherein the controller sets the lower bound level according to a rated output power of the DC/AC converter.

18. The inverter apparatus of claim 15, wherein the energy level is a voltage level.