Power conversion system and controlling method thereof

Abstract

A power conversion system includes a power conversion module, a first switching module, a second switching module, a drive unit, and a standby power module. The first switching module includes a first output terminal and a first input terminal for receiving a first input voltage. The second switching module includes a second output terminal and a second input terminal for receiving a second input voltage, wherein the power conversion module, the first output terminal, and the second output terminal are coupled to each other. The drive unit is coupled to the first switching module, the second switching module, and the power conversion module, and is used to drive the first switching module and the second switching module respectively according to a plurality of drive signals from the power conversion module. The standby power module is coupled to the second input terminal, the drive unit, and the power conversion module.

Claims

1. A power conversion system, comprising: a power conversion module; a first switching module including a first output terminal and a first input terminal for receiving a first input voltage; a second switching module including a second output terminal and a second input terminal for receiving a second input voltage, wherein the power conversion module, the first output terminal, and the second output terminal are coupled to each other; a driving unit coupled to the first switching module, the second switching module, and the power conversion module, for driving the first switching module and the second switching module respectively according to a plurality of driving signals of the power conversion module; and a standby power module coupled to the second input terminal, the driving unit, and the power conversion module; wherein... When the first input voltage and the second input voltage drop to a specific value, the power conversion module controls the drive unit to turn on the first switching module and turn off the second switching module; wherein, during the period when the first input voltage and the second input voltage drop from the specific value to zero, the first switching module remains on and the second switching module remains off; wherein, when the first switching module is on and the first input voltage is less than a first operating voltage value, and the second input voltage is less than or equal to a second operating voltage value and greater than or equal to the first operating voltage value, the standby power module provides standby power to the power conversion module, and the power conversion module controls the drive unit to turn off the first switching module and turn on the second switching module to supply power to the power conversion module according to the second input voltage.

2. The power conversion system as claimed in claim 1, wherein the specific value is greater than the first operating voltage value and the specific value is less than the second operating voltage value.

3. The power conversion system as described in claim 1, wherein the power conversion module comprises: a standby power supply module coupled to the drive unit; and a main control unit coupled to the standby power supply module, the standby power supply module, and the drive unit; wherein, The main control unit is used to receive a standby power supply or the standby power supply provided by the standby power supply module, and to output the drive signals to the drive unit.

4. The power conversion system as claimed in claim 3, wherein the first switching module comprises: a first switch coupled between the first input terminal and the first output terminal; and a first coil that, in response to whether the driving unit outputs the standby power supply or the standby power supply, turns the first switch on or off.

5. The power conversion system as claimed in claim 4, wherein the second switching module comprises: a second switch coupled between the second input terminal and the second output terminal; and a second coil that, in response to whether the driving unit outputs the standby power supply or the standby power supply, turns the second switch on or off.

6. The power conversion system as described in claim 5, wherein the drive unit comprises: a third switch, including: a third terminal 1 coupled to the main control unit; a third terminal 2 coupled to the first coil; and a third terminal 3 coupled to the standby power module and the standby power supply module; wherein, The main control unit outputs a first drive signal from among these drive signals, which controls the third second and third third terminals to be on or off via the third first terminal. When the third second and third third terminals are on, the standby power supply or the standby power supply energizes the first coil to turn on the first switch.

7. The power conversion system as claimed in claim 6, wherein the drive unit comprises: a fourth switch, including: a fourth terminal coupled to the main control unit; a fourth terminal coupled to the second coil; and a fourth terminal coupled to the standby power supply and the standby power supply module; wherein, The main control unit outputs a second drive signal of the drive signals, which controls the fourth second and fourth third terminals to be turned on or off via the fourth first terminal. When the fourth second and fourth third terminals are turned on, the standby power supply or the standby power supply energizes the second coil to turn on the second switch.

8. The power conversion system as described in claim 3 further comprises: a first detection unit coupled to the first input terminal and the main control unit, wherein the first detection unit comprises: a first upper arm resistor; and a first lower arm resistor connected in series with the first upper arm resistor; wherein, The first detection unit is used to detect the first input voltage at the first input terminal to transmit a first signal to the main control unit at a first node, wherein the first node is located between the first upper arm resistor and the first lower arm resistor; and a second detection unit is coupled to the second input terminal and the main control unit, wherein the second detection unit includes: a second upper arm resistor; and a second lower arm resistor connected in series with the second upper arm resistor; and wherein the second detection unit is used to detect the second input voltage at the second input terminal to transmit a second signal to the main control unit at a second node, wherein the second node is located between the second upper arm resistor and the second lower arm resistor.

9. The power conversion system as described in claim 8 further comprises: a third detection unit coupled to the first output terminal or the second output terminal and the main control unit; wherein the third detection unit comprises: a third upper arm resistor; and a third lower arm resistor connected in series with the third upper arm resistor; wherein, The third detection unit transmits the third signal to the main control unit at a third node, wherein the third node is located between a third upper arm resistor and a third lower arm resistor; wherein the third detection unit is used to detect a voltage at the first output terminal or the second output terminal to transmit the third signal to the main control unit, wherein the main control unit generates drive signals to control the drive unit based on the first signal, the second signal, and the third signal.

10. The power conversion system as claimed in claim 3 further comprises: a first diode having an anode coupled to the standby power module and a cathode coupled to the drive unit; and a second diode having an anode coupled to the standby power module and a cathode coupled to the drive unit; wherein, The drive unit responds to the drive signals and outputs the standby power supply or the standby power supply to drive the first switching module or the second switching module.

11. The power conversion system as claimed in claim 3, wherein when the first input voltage and the second input voltage are greater than or equal to the first operating voltage value and less than or equal to the second operating voltage value, and the first switching module is turned on, the main control unit controls the standby power module to a sleep mode after a predetermined time, so that the standby power module stops supplying power to the power conversion module; and when the standby power module is in the sleep mode and the first input voltage or the second input voltage drops to the specific value, the main control unit controls the standby power module to an operating mode, and the standby power module supplies power to the power conversion module.

12. A control method for a power conversion system, wherein the power conversion system includes a power conversion module, a first switching module, a second switching module, a drive unit, and a standby power module, wherein the drive unit is coupled to the first switching module, the second switching module, and the power conversion module; a first output terminal of the power conversion module and a second output terminal of the first switching module are coupled to each other; and the standby power module is coupled to the second switching module, the drive unit, and the power conversion module, wherein the control method includes: supplying power to the power conversion module through the first switching module based on a first input voltage at a first input terminal of the first switching module; when the first input voltage is less than a first operating voltage value, and a second input voltage at a second input terminal of the second switching module is less than or equal to a second operating voltage value and greater than or equal to the first operating voltage value, The standby power module provides standby power to the power conversion module, and the drive unit controls the first switching module to be disconnected and the second switching module to be connected according to a plurality of drive signals from the power conversion module, so as to supply power to the power conversion module according to the second input voltage; when the first input voltage and the second input voltage drop to a specific value, the power conversion module outputs the drive signals to control the drive unit to connect the first switching module and disconnect the second switching module; and during the period when the first input voltage and the second input voltage drop from the specific value to zero, the first switching module remains connected and the second switching module remains disconnected.

13. The control method as claimed in claim 12, wherein the power conversion module includes a standby power supply module and a main control unit, wherein the standby power supply module is coupled to the drive unit, and the main control unit is coupled to the standby power supply module, the standby power supply module and the drive unit, wherein the control method further includes: providing a standby power supply through the standby power supply module or the standby power supply to power the main control unit, so that the main control unit outputs the drive signals to the drive unit.

14. The control method as described in claim 12 further comprises: when the first input voltage and the second input voltage are greater than or equal to the first operating voltage value and less than or equal to the second operating voltage value, and the first switching module is turned on, controlling the standby power module to a sleep mode after a predetermined time through a main control unit, so that the standby power module stops supplying power to the power conversion module.

15. The control method as described in claim 14 further comprises: when the standby power module is in the hibernation mode and the first input voltage or the second input voltage drops to the specific value, controlling the standby power module to an operating mode through the main control unit so that the standby power module supplies power to the power conversion module.

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