Modularized multi-path integrated current-sharing DCDC switching power supply circuit and control method

Abstract

The invention discloses a modularized multi-path integrated current-sharing DCDC switching power supply circuit and a control method. The circuit is characterized in that the positive electrode output ends of all DCDC modules are connected to the positive electrode of an output voltage in parallel, and the negative electrode output ends of all DCDC modules are connected to the negative electrode of the output voltage in parallel; the cathode input end of each DCDC module is connected to the cathode of the input voltage, except the last DCDC module, the cathode input end of each DCDC module is connected with the anode input end of the next DCDC module through one switch module, and the anode input end of the first DCDC module is connected with the anode of the input voltage; and the main control chip is used for respectively controlling the switch-on or switch-off of the switch modules among the DCDC modules and the starting of the DCDC modules according to the received output voltage and output current. According to the invention, through parallel connection of multiple DCDC power supplies, the problem of large current of a traditional DCDC power supply in a large-power application scene is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated power supplies, and more specifically, relates to a modular multi-channel integrated current-sharing DCDC switching power supply circuit and a control method. Background Art

[0002] In the prior art, Figure 1 The power components of the single-channel DC-DC resonant converter shown in the figure have limited voltage and current stresses they can withstand, limiting their application. Furthermore, high-power applications typically require a larger transformer ratio to achieve high-to-low voltage conversion. This large ratio complicates transformer design, including core selection and winding design. Furthermore, in low-voltage, high-current output scenarios, circuit parasitics (such as inductance and capacitance) can affect system stability and increase switching losses. Furthermore, thermal management is a critical issue in high-power applications, as excessively high temperatures can reduce component life and efficiency.

[0003] like Figure 2 As shown, a two-way staggered parallel CLLC body topology circuit is proposed in the prior art, but its usage scenarios are limited. It cannot meet the power supply requirements of different power levels and cannot automatically adjust the number of CLLC modules to be used according to the power level.

[0004] CN119420152A proposes a multi-channel symmetrical CLLC topology and its power balancing control method. The structure includes a multi-channel symmetrical CLLC converter main circuit loop, a high-precision sampling module, a phase-shift angle controller module, input capacitors, output capacitors, and an equivalent load. However, this patent fails to control the number of multi-channel DCDC access circuits and cannot adaptively control different situations and requirements. Although power balancing is achieved, if the balanced power consumption still cannot meet the requirements, there may still be safety risks. Summary of the Invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a modular multi-channel integrated current-sharing DCDC switching power supply circuit and a control method.

[0006] The present invention adopts the following technical solutions.

[0007] The first aspect of the present invention proposes a modular multi-channel integrated current-sharing DCDC switching power supply circuit, including several DCDC modules, several switch modules, a current sampling circuit, an analog-to-digital conversion circuit, and a main control chip, specifically:

[0008] The positive output terminals of all DCDC modules are connected in parallel to the positive terminal of the output voltage Vout, and the negative output terminals are connected in parallel to the negative terminal of the output voltage Vout; the negative input terminal of each DCDC module is connected to the negative terminal of the input voltage Vin, and except for the last DCDC module, the negative input terminal of each DCDC module is connected to the positive input terminal of the next DCDC module through a switch module. The positive input terminal of the first DCDC module is connected to the positive terminal of the input voltage Vin;

[0009] The current sampling circuit is used to collect the output voltage Vout and the output current Io between the positive and negative poles of the output voltage Vout, and output them to the main control chip after analog-to-digital conversion through the analog-to-digital conversion circuit. The main control chip is used to control the conduction or shutdown of the switch modules between each DCDC module and the startup of each DCDC module according to the received output voltage Vout and output current Io.

[0010] Preferably, the DCDC modules are all bidirectional transmission DCDC modules.

[0011] Preferably, the switch module is a switch tube, the drain of the switch tube is connected to the negative input terminal of the corresponding DCDC module, and the source of the switch tube is connected to the positive input terminal of the corresponding next DCDC module.

[0012] Preferably, the total number of DCDC modules is:

[0013] Calculate the maximum cost divided by the cost of a single DCDC module, the maximum current required by the switching power supply divided by the maximum allowable current of the DCDC module, and the power required by the switching power supply divided by the minimum allowable power of the DCDC module. Average the three calculated results and round them up to the nearest integer. The rounded result is the number of DCDC modules.

[0014] The second aspect of the present invention provides a control method for the modular multi-channel integrated current-sharing DCDC switching power supply circuit based on the first aspect of the present invention, comprising:

[0015] Turn off the switch modules between all DCDC modules, start the first DCDC module, sample the output voltage Vout and output current Io, calculate the output power, and determine whether the output current Io is greater than the set maximum allowable current or whether the output power is less than the set minimum allowable power. If so, control the first switch module to turn on and start the next DCDC module; otherwise, keep the current operation state of each DCDC module. The first switch module is the switch module connecting the first DCDC module and the second DCDC module;

[0016] After being turned on, if the current output current Io is greater than the set maximum allowable current or the current output power is less than the set minimum allowable power, the next switch module is controlled to be turned on and the above steps are repeated.

[0017] Preferably, all DCDC modules are started up as soft start, specifically:

[0018] The soft start uses two complementary drive signals to control the switch tube of the upper bridge arm and the switch tube of the lower bridge arm at the input end respectively. The duty cycle of the two complementary drive signals increases from 0 according to the set step size until it increases to the set duty cycle threshold. The two complementary drive signals with a duty cycle equal to the set duty cycle threshold control the switch tube of the upper bridge arm and the switch tube of the lower bridge arm at the output end respectively.

[0019] The third aspect of the present invention provides a device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of a control method for a modular multi-channel integrated current-sharing DCDC switching power supply circuit according to the second aspect of the present invention.

[0020] The fourth aspect of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the control method of the modular multi-channel integrated current-sharing DCDC switching power supply circuit described in the second aspect of the present invention are used.

[0021] The beneficial effects of the present invention are that, compared with the prior art, by using a parallel multi-channel DCDC topology, it solves the problems of large transformation ratios, difficulty controlling low voltage and high current, and heat dissipation encountered in high-power applications, thereby increasing its applicable power range. Furthermore, by setting the total number of DCDC modules based on multiple parameters, it solves the problem of difficult design of high-transformation-ratio transformers in DCDC power supplies for high-power applications. By controlling the number of parallel DCDC modules by output current or output power, it solves the high current problems and heat dissipation difficulties associated with high current in high-power applications. By optimizing the design, it reduces power loss and increases power supply efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the topology circuit diagram of a single-channel DCDC resonant converter;

[0023] Figure 2 It is a two-way staggered parallel CLLC body topology circuit diagram;

[0024] Figure 3 This is a multi-channel DCDC parallel power supply circuit diagram;

[0025] Figure 4 This is the flow chart of the DCDC module soft start;

[0026] Figure 5 Flowchart of the method of the present invention. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] like Figure 3 As shown, embodiment 1 of the present invention proposes a modular multi-channel integrated current-sharing DCDC switching power supply circuit, including several DCDC modules, several switch modules, a current sampling circuit, an analog-to-digital conversion circuit, and a main control chip, specifically:

[0029] The positive output terminals of all DCDC modules are connected in parallel to the positive terminal of the output voltage Vout, and the negative output terminals are connected in parallel to the negative terminal of the output voltage Vout; the negative input terminal of each DCDC module is connected to the negative terminal of the input voltage Vin, and except for the last DCDC module, the negative input terminal of each DCDC module is connected to the positive input terminal of the next DCDC module through a switch module. The positive input terminal of the first DCDC module is connected to the positive terminal of the input voltage Vin;

[0030] The current sampling circuit is used to collect the output voltage Vout and the output current Io between the positive and negative poles of the output voltage Vout, and output them to the main control chip after analog-to-digital conversion through the analog-to-digital conversion circuit. The main control chip is used to control the conduction or shutdown of the switch modules between each DCDC module and the startup of each DCDC module according to the received output voltage Vout and output current Io.

[0031] In this embodiment, preferably, the DCDC modules are all bidirectional transmission DCDC modules, including but not limited to CLLC topology, LLC topology, and four-switch BUCK_BOOST topology.

[0032] Specifically, the DCDC module in this embodiment uses the following Figure 1 The CLLC topology is shown.

[0033] In this embodiment, the switch module is preferably a switch tube, the drain of the switch tube is connected to the negative input terminal of the corresponding DCDC module, and the source of the switch tube is connected to the positive input terminal of the corresponding next DCDC module.

[0034] In this embodiment, preferably, the total number of DCDC modules is:

[0035] Calculate the maximum cost divided by the cost of a single DCDC module, the maximum current required by the switching power supply divided by the maximum allowable current of the DCDC module, and the power required by the switching power supply divided by the minimum allowable power of the DCDC module. Average the three calculated results and round them up to the nearest integer. The rounded result is the number of DCDC modules.

[0036] Specifically, the maximum allowable current of the DCDC module in this embodiment is 10 A, and the minimum allowable power of the DCDC module is 4 kW.

[0037] like Figure 5 As shown, embodiment 2 of the present invention proposes a control method for the modular multi-channel integrated current-sharing DCDC switching power supply circuit based on embodiment 1 of the present invention, including:

[0038] Turn off the switch modules between all DCDC modules, start the first DCDC module, sample the output voltage Vout and output current Io, calculate the output power, and determine whether the output current Io is greater than the set maximum allowable current or whether the output power is less than the set minimum allowable power. If so, control the first switch module to turn on and start the next DCDC module; otherwise, keep the current operation state of each DCDC module. The first switch module is the switch module connecting the first DCDC module and the second DCDC module;

[0039] After being turned on, if the current output current Io is greater than the set maximum allowable current or the current output power is less than the set minimum allowable power, the next switch module is controlled to be turned on and the above steps are repeated.

[0040] In this embodiment, preferably, Figure 4 As shown in the figure, all DCDC modules are started with soft start, specifically:

[0041] The soft start uses two complementary drive signals to control the switch tube of the upper bridge arm and the switch tube of the lower bridge arm at the input end respectively. The duty cycle of the two complementary drive signals increases from 0 according to the set step size until it increases to the set duty cycle threshold. The two complementary drive signals with a duty cycle equal to the set duty cycle threshold control the switch tube of the upper bridge arm and the switch tube of the lower bridge arm at the output end respectively.

[0042] Specifically, the duty cycle threshold set in this embodiment is 0.5.

[0043] It should be noted that Figure 4The self-powered operation of the input end and the self-powered operation of the output end respectively supplies power to the input and output related modules. The related modules include but are not limited to the driving modules of the inverter circuit switching tubes at the input and output ends of the DCDC module, so that the input and output ends can operate.

[0044] Embodiment 3 of the present invention proposes a device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of a control method for a modular multi-channel integrated current-sharing DCDC switching power supply circuit as described in Embodiment 2 of the present invention.

[0045] Embodiment 4 of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the control method of the modular multi-channel integrated current-sharing DCDC switching power supply circuit described in Embodiment 2 of the present invention are used.

[0046] The present disclosure may be a system, method and / or computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A modular multi-channel integrated current-sharing DCDC switching power supply circuit, comprising several DCDC modules, several switch modules, a current sampling circuit, an analog-to-digital conversion circuit, and a main control chip, characterized by: The positive output terminals of all DCDC modules are connected in parallel to the positive terminal of the output voltage Vout, and the negative output terminals are connected in parallel to the negative terminal of the output voltage Vout; the negative input terminal of each DCDC module is connected to the negative terminal of the input voltage Vin, and except for the last DCDC module, the negative input terminal of each DCDC module is connected to the positive input terminal of the next DCDC module through a switch module. The positive input terminal of the first DCDC module is connected to the positive terminal of the input voltage Vin; The current sampling circuit is used to collect the output voltage Vout and the output current Io between the positive and negative poles of the output voltage Vout, and output them to the main control chip after analog-to-digital conversion through the analog-to-digital conversion circuit. The main control chip is used to control the conduction or shutdown of the switch modules between each DCDC module and the startup of each DCDC module according to the received output voltage Vout and output current Io.

2. The modular multi-channel integrated current-sharing DCDC switching power supply circuit according to claim 1, characterized in that: The DCDC modules are all bidirectional transmission DCDC modules.

3. The modular multi-channel integrated current-sharing DCDC switching power supply circuit according to claim 1, characterized in that: The switch module is a switch tube, the drain of the switch tube is connected to the negative input terminal of the corresponding DCDC module, and the source of the switch tube is connected to the positive input terminal of the corresponding next DCDC module.

4. The modular multi-channel integrated current-sharing DCDC switching power supply circuit according to claim 1, characterized in that: The total number of DCDC modules is: Calculate the maximum cost divided by the cost of a single DCDC module, the maximum current required by the switching power supply divided by the maximum allowable current of the DCDC module, and the power required by the switching power supply divided by the minimum allowable power of the DCDC module. Average the three calculated results and round them up to the nearest integer. The rounded result is the number of DCDC modules.

5. A control method for a modular multi-channel integrated current-sharing DCDC switching power supply circuit according to any one of claims 1 to 4, characterized in that: include: Turn off the switch modules between all DCDC modules, start the first DCDC module, sample the output voltage Vout and output current Io, calculate the output power, and determine whether the output current Io is greater than the set maximum allowable current or whether the output power is less than the set minimum allowable power. If so, control the first switch module to turn on and start the next DCDC module; otherwise, keep the current operation state of each DCDC module. The first switch module is the switch module connecting the first DCDC module and the second DCDC module; After being turned on, if the current output current Io is greater than the set maximum allowable current or the current output power is less than the set minimum allowable power, the next switch module is controlled to be turned on and the above steps are repeated.

6. The control method of the modular multi-channel integrated current-sharing DCDC switching power supply circuit according to claim 5, characterized in that: All DCDC modules are started with soft start, specifically: The soft start uses two complementary drive signals to control the switch tube of the upper bridge arm and the switch tube of the lower bridge arm at the input end respectively. The duty cycle of the two complementary drive signals increases from 0 according to the set step size until it increases to the set duty cycle threshold. The two complementary drive signals with a duty cycle equal to the set duty cycle threshold control the switch tube of the upper bridge arm and the switch tube of the lower bridge arm at the output end respectively.

7. A device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of a control method for a modular multi-channel integrated current-sharing DCDC switching power supply circuit according to any one of claims 5 to 6.

8. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the steps of the control method of the modular multi-channel integrated current-sharing DCDC switching power supply circuit according to any one of claims 5 to 6 are used.

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