Isolated power control device, power conversion device and isolated power control method used in power conversion device

• US 9,735,688 B2
• Filed: 10/07/2015
• Issued: 08/15/2017
• Est. Priority Date: 10/11/2014
• Status: Active Grant

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Yang, Zhong-Wang, Lu, Sheng-Li, Li, Wen-Hua, Zhang, Qiong
• Primary Examiner(s): Tran, Nguyen
• Application Number:
  US14/877,898
• Publication Number:
  US 20160105117A1
• Time in Patent Office: 678 Days
• Field of Search: 363 2112- 2118, 363 65, 307 82, 307 83
• CPC Class Codes: H02M 1/0003 Details of control, feedback or regulation circuits
• CPC Class Codes: H02M 3/33523 with galvanic isolation between input and output of both the power stage and the feedback loop
• CPC Class Codes: H02M 3/33569 having several active switching elements H02M3/3353 takes precedence
• CPC Class Codes: H02M 3/33571 Half-bridge at primary side of an isolation transformer

Abstract

An isolated power control device that includes an auxiliary isolated power circuit and a voltage level identification unit is provided. The auxiliary isolated power circuit includes a transformer module, a control module, and a switch module. The transformer module includes a primary side and a secondary side. The control module generates a switch control signal according to a primary side remote on/off control signal. The switch module is conducted according to the switch control signal to transmit an input auxiliary power signal to the primary side of the transformer module such that the auxiliary isolated power circuit generates a target voltage signal having a plurality of voltage levels. The voltage level identification unit receives the target voltage signal to output a secondary side remote on-off control signal to control a main isolated power device.

Claims

1. An isolated power control device comprising:

an auxiliary isolated power circuit comprising;

a transformer module having a primary side and a secondary side;

a control module generating a switch control signal according to a primary side remote on/off control signal; and

a switch module being conducted according to the switch control signal to transmit an input auxiliary power signal to the primary side of the transformer module such that the auxiliary isolated power circuit generates a target voltage signal at the secondary side, the target voltage signal having a plurality of voltage levels; and

a voltage level identification unit configured for receiving the target voltage signal to output a secondary side remote on/off control signal so as to control a main isolated power device,

wherein the main isolated power device comprises a main control circuit and a main isolated power circuit, the main control circuit controls the switches of the main isolated power circuit to perform at high frequency when the primary side remote on/off control signal is in a first state, and the main control circuit controls the switches of the main isolated power circuit to stop operating when the primary side remote on/off control signal is in a second state.

2. The isolated power control device of claim 1, wherein the control module outputs a first switch control signal when the primary side remote on/off control signal is in a first state, the control module outputs a second switch control signal when the primary side remote on/off control signal is in a second state.

3. The isolated power control device of claim 1, wherein an output terminal of the auxiliary isolated power circuit generates the target voltage signal having a first voltage value when the primary side remote on/off control signal is in a first state, the output terminal of the auxiliary isolated power circuit generates the target voltage signal having a second voltage value when the primary side remote on/off control signal is in a second state.

4. The isolated power control device of claim 1, wherein the voltage level identification unit generates the secondary side remote on/off control signal having a first voltage level when the target voltage signal is larger than a first reference voltage such that the switches of the main isolated power circuit performs at high frequency, the voltage level identification unit generates the secondary side remote on/off control signal having a second voltage level different from the first voltage level when the target voltage signal is not larger than the first reference voltage such that the switches of the main isolated power circuit stops operating.

5. The isolated power control device of claim 3, wherein the voltage level identification unit generates the secondary side remote on/off control signal having a first voltage level when the target voltage signal is larger than a first reference voltage such that the switches of the main isolated power circuit performs at high frequency, the voltage level identification unit generates the secondary side remote on/off control signal having a second voltage level different from the first voltage level when the target voltage signal is not larger than the first reference voltage such that the switches of the main isolated power circuit stops operating.

6. The isolated power control device of claim 1, wherein the voltage level identification unit generates the secondary side remote on/off control signal having a first voltage level when the target voltage signal is not larger than a first reference voltage such that the switches of the main isolated power circuit performs at high frequency switching, the voltage level identification unit generates the secondary side remote on/off control signal having a second voltage level different from the first voltage level when the target voltage signal is larger than the first reference voltage such that the switches of the main isolated power circuit stops operating.

7. The isolated power control device of claim 3, wherein the voltage level identification unit generates the secondary side remote on/off control signal having a first voltage level when the target voltage signal is not larger than a first reference voltage such that the switches of the main isolated power circuit performs at high frequency switching, the voltage level identification unit generates the secondary side remote on/off control signal having a second voltage level different from the first voltage level when the target voltage signal is larger than the first reference voltage such that the switches of the main isolated power circuit stops operating.

8. The isolated power control device of claim 1, wherein the secondary side of the transformer module comprises a secondary winding and an output voltage division module, the output voltage division module is electrically connected to the secondary winding, the secondary winding of the auxiliary isolated power circuit generates an output auxiliary power signal, and the target voltage signal is generated at the output voltage division module, wherein the auxiliary isolated power circuit further comprises a regulator circuit configured for receiving the output auxiliary power signal so as to generate a direct current output auxiliary power signal.

9. The isolated power control device of claim 1, wherein the secondary side of the transformer module comprises a first secondary winding and a second secondary winding, the first secondary winding of the auxiliary isolated power circuit generates an output auxiliary power signal, and the target voltage signal is generated at the second secondary winding, wherein the auxiliary isolated power circuit further comprises a regulator circuit configured for receiving the output auxiliary power signal so as to generate a direct current output auxiliary power signal.

10. The isolated power control device of claim 1, wherein the voltage level identification unit respectively records a first voltage value and a second voltage value to which the target voltage signal corresponds when the primary side remote on/off control signal is in a first state and in a second state, and stores an average value of the first voltage value and second voltage value as a first reference voltage.

11. The isolated power control device of claim 1, wherein the voltage level identification unit configured for comparing the target voltage signal with a first reference voltage to output a secondary side remote on/off control signal so as to control the main isolated power device.

12. A power conversion device comprising:

a main isolated power device; and

an isolated power control device comprising;

an auxiliary isolated power circuit comprising;

a transformer module having a primary side and a secondary side;

a control module generating a switch control signal according to a primary side remote on/off control signal; and

a switch module being conducted according to the switch control signal to transmit an input auxiliary power signal to the primary side of the transformer module such that the auxiliary isolated power circuit generates a target voltage signal at the secondary side, the target voltage signal having a plurality of voltage levels; and

a voltage level identification unit configured for receiving the target voltage signal to output a secondary side remote on/off control signal so as to control the main isolated power device,

wherein the main isolated power device comprises a main control circuit and a main isolated power circuit, the main control circuit controls the switches of the main isolated power circuit to perform at high frequency when the primary side remote on/off control signal is in a first state, and the main control circuit controls the switches of the main isolated power circuit to stop operating when the primary side remote on/off control signal is in a second state.

13. The power conversion device of claim 12, wherein the secondary side of the transformer module of the auxiliary isolated power circuit comprises a secondary winding and an output voltage division module, the output voltage division module is electrically connected to the secondary winding, the secondary winding of the auxiliary isolated power circuit generates an output auxiliary power signal, and the target voltage signal is generated at the output voltage division module.

14. The power conversion device of claim 12, wherein the secondary side of the transformer module of the auxiliary isolated power circuit comprises a first secondary winding and a second secondary winding, the first secondary winding of the auxiliary isolated power circuit generates an output auxiliary power signal, and the target voltage signal is generated at the second secondary winding.

15. The power conversion device of claim 13, wherein the auxiliary isolated power circuit further comprises a regulator circuit connected to the secondary winding for receiving the output auxiliary power signal so as to generate a direct current output auxiliary power signal.

16. The power conversion device of claim 14, wherein the auxiliary isolated power circuit further comprises a regulator circuit connected to the first secondary winding for receiving the output auxiliary power signal so as to generate a direct current output auxiliary power signal.

17. The power conversion device of claim 12, wherein the voltage level identification unit respectively records a first voltage value and a second voltage value to which the target voltage signal corresponds when the primary side remote on/off control signal is in a first state and in a second state, and stores an average value of the first voltage value and second voltage value as a first reference voltage.

18. An isolated power control method applied to an isolated power control device comprising an auxiliary isolated power circuit and a voltage level identification unit, the auxiliary isolated power circuit comprising a transformer module having a primary side and a secondary side, a control module and a switch module, and the isolated power control method comprising the following steps:

using the control module for generating a switch control signal according to a primary side remote on/off control signal, and the switch module being conducted according to the switch control signal to transmit an input auxiliary power signal to the primary side of the transformer module such that the auxiliary isolated power circuit generates a target voltage signal at the secondary side, the target voltage signal having a plurality of voltage levels; and

using the voltage level identification unit for receiving the target voltage signal to output a secondary side remote on/off control signal so as to control a main isolated power device, wherein the main isolated power device comprises a main control circuit and a main isolated power circuit, the main control circuit controls the switches of the main isolated power circuit to perform at high frequency when the primary side remote on/off control signal is in a first state, and the main control circuit controls the switches of the main isolated power circuit to stop operating when the primary side remote on/off control signal is in a second state.

19. The isolated power control method of claim 18, wherein the voltage level identification unit respectively records a first voltage value and a second voltage value to which the target voltage signal corresponds when the primary side remote on/off control signal is in a first state and in a second state, and stores an average value of the first voltage value and second voltage value as a first reference voltage.