Power supply system and control method thereof

Abstract

This case relates to a power supply system and its control method. The power supply system includes a plurality of power supply modules and a CAN bus. The plurality of power supply modules are connected in parallel via the CAN bus. The control method includes the following steps: First, flag information and current information of each power supply module are collected, and the flag information and current information are placed in the identification code of the data frame of the corresponding power supply module. The identification code is then transmitted to the CAN bus. Next, the frame start bit of any power supply module is triggered to drive the corresponding identification code to arbitrate, so that the power supply module that wins the arbitration becomes the main control module, and the current information in the main control module is used as the target current. Then, each of the remaining power supply modules adjusts its corresponding current information to the target current.

Claims

1. A control method applied to a power supply system comprising a plurality of power modules and a CAN bus, the plurality of power modules being connected in parallel via the CAN bus, wherein the control method comprises the following steps: (a) acquiring a flag information and a current information for each power module, placing the flag information and the current information in an identification code of a data frame of the corresponding power module, and transmitting the identification code to the CAN bus; (b) triggering a frame start bit of any power module to drive the corresponding identification code to begin arbitration, such that the power module that obtains a winning condition becomes a master control module, and the current information in the master control module becomes a target current; and (c) each of the remaining power modules adjusts the corresponding current information to the target current.

2. The control method as claimed in claim 1, wherein the control method further comprises the following steps: (d) confirming whether the flag information in the identification code of the data frame of the main control module generates a stop flag; (e) if the confirmation result of step (d) is yes, controlling the plurality of power modules to stop operating; (f) if the confirmation result of step (d) is no, confirming whether a communication delay time of each power module has ended; (g) if the confirmation result of step (f) is yes, controlling the plurality of power modules to recount and then re-execute step (a); and (h) if the confirmation result of step (f) is no, re-execute step (f).

3. The control method as described in claim 2, wherein the stop flag is a flag indicating that the main control module is under power overvoltage or overpower protection, or that the flag information of the corresponding identification code is at its highest bit.

4. The power system as claimed in claim 1, wherein the data frame of each power module includes a data field, wherein the arbitration order of the current information in the identification code is earlier than the arbitration order of the data field.

5. The control method as described in claim 1, wherein the data frame is in a standard format or an extended format.

6. The control method as claimed in claim 1, wherein the target current corresponding to the main control module is the power module that has the maximum value of the current information among the plurality of power modules.

7. The control method as claimed in claim 1, wherein step (c) further comprises the following steps: (c1) setting up a first processing unit to receive and process the target current, a feedback control signal, and a voltage control signal to output a processing signal; (c2) setting up a gain scaling factor unit to adjust the processing signal to output a gain signal; (c3) setting up a filter to filter the gain signal to output the corresponding current information and an output voltage; (c4) setting up a feedback control unit to perform feedback control on the current information to output the feedback control signal; (c5) setting up a sensor gain unit to perform gain control on the output voltage to output a voltage gain signal; (c6) setting up a second processing unit to subtract the voltage gain signal from a reference voltage to output a voltage difference signal; and (c7) setting up a voltage control unit to adjust the voltage difference signal to output the voltage control signal.

8. A power supply system, comprising: a CAN bus; and a plurality of power modules connected in parallel via the CAN bus, wherein each power module comprises: a microcontroller including a data frame, and the microcontroller is configured to acquire flag information and current information corresponding to the power module, and place them in an identification code of the corresponding data frame; and a communication interface for transmitting the identification code of the corresponding data frame to the CAN bus; wherein... The start bit of a data frame of any power module is triggered to drive the corresponding identification code to start arbitration, so that the power module that wins the condition becomes a main control module, and the current information in the main control module becomes a target current, and each of the remaining power modules adjusts the corresponding current information to the target current.

9. The power system as claimed in claim 8, wherein the microcontroller of the main control module is further configured to confirm whether the flag information in the identification code of the corresponding data frame generates a stop flag, wherein when the microcontroller confirms that the flag information in the identification code of the data frame generates the stop flag, the microcontroller controls the plurality of power modules to stop operating; when the microcontroller confirms that the flag information in the identification code of the data frame does not generate the stop flag, the microcontroller confirms whether a communication delay time for each power module has ended, wherein when the microcontroller confirms that the communication delay time for the corresponding power module has ended, the microcontroller controls the plurality of power modules to recount.

10. The power system of claim 8, wherein the data frame of each power module includes a data field, wherein the arbitration order of the current information in the identification code is earlier than the arbitration order of the data field.

11. The power system as described in claim 8, wherein the data frame is in a standard format or an extended format.

12. The power system as claimed in claim 8, wherein the target current corresponding to the main control module is the power module that has the maximum value of the current information among the plurality of power modules.

13. The power supply system of claim 8, wherein the microcontroller further comprises: a first processing unit for receiving and processing the target current, a feedback control signal, and a voltage control signal to output a processing signal; a gain scaling factor unit for adjusting the processing signal to output a gain signal; and a filter for filtering the gain signal to output corresponding current information and an output voltage. A feedback control unit is used to perform feedback control on the current information to output the feedback control signal; a sensor gain unit is used to perform gain control on the output voltage to output a voltage gain signal; a second processing unit is used to subtract the voltage gain signal from a reference voltage to output a voltage difference signal. And a voltage control unit for adjusting the voltage difference signal to output the voltage control signal.

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