Parallel DC converter droop control monitoring system

Abstract

The utility model relates to the technical field of converter control, in particular to a parallel DC converter droop control monitoring system, which comprises a droop control module, a converter control module and a signal monitoring module, the input end of the droop control module is electrically connected with an interleaved parallel DC converter system, and the output end of the droop control module is connected with the converter control module; the output end of the converter control module is electrically connected with each direct-current converter of the interleaved parallel direct-current converter system, the input end of the signal monitoring module is electrically connected with the output end of the converter control module, and the output end of the signal monitoring module is electrically connected with the droop control module. Control signals output by the converter control module can be collected and processed in real time, and when signal deviation is detected, the droop control module is triggered to carry out adjustment, so that the consistency of the control signals received by the direct-current converters is ensured.

Description

Technical Field

[0001] This utility model relates to the field of converter control technology, specifically a droop control and monitoring system for a parallel DC-DC converter. Background Technology

[0002] Interleaved parallel DC-DC converter systems can improve power output and are widely used in important power conversion equipment. Interleaved parallel DC-DC converter systems employing droop control technology are an advanced topology widely used in the field of power electronics. Droop control technology achieves current-sharing control for parallel operation of DC-DC converters by adjusting the output voltage.

[0003] However, existing droop control technology relies on the consistency of module parameters. However, due to factors such as component tolerance, temperature drift or aging, the droop coefficient, voltage reference value or current feedback signal of each module are easily affected and deviate, resulting in inconsistent output voltage regulation signals. This leads to current distribution imbalance, reduced efficiency, and even stability problems in the interleaved parallel DC-DC converter system. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a droop control and monitoring system for parallel DC-DC converters, electrically connected to an interleaved parallel DC-DC converter system. The interleaved parallel DC-DC converter system comprises several DC-DC converters connected in parallel. The parallel DC-DC converter droop control and monitoring system includes a droop control module, a converter control module, and a signal monitoring module. The input terminal of the droop control module is electrically connected to the interleaved parallel DC-DC converter system, and its output terminal is connected to the converter control module. The output terminal of the converter control module is electrically connected to each DC-DC converter in the interleaved parallel DC-DC converter system. The input terminal of the signal monitoring module is electrically connected to the output terminal of the converter control module, and its output terminal is electrically connected to the droop control module.

[0005] To achieve consistent monitoring of the output signal of the droop control module, the signal monitoring module includes a digital phase-locked loop synchronization circuit, a parameter extraction circuit, a processor unit, and a wireless communication component. The digital phase-locked loop synchronization circuit is connected to the parameter extraction circuit, and the processor unit is electrically connected to both the parameter extraction circuit and the wireless communication component.

[0006] The digital phase-locked loop synchronization circuit includes a zero-crossing detection circuit, a phase detector, a controller, a clock circuit, and a frequency divider. The output of the zero-crossing detection circuit is connected to the input of the phase detector. The first and second outputs of the phase detector are electrically connected to the controller. The first and second inputs of the clock circuit are electrically connected to the controller. The output of the controller is connected to the input of the frequency divider. The first and second outputs of the frequency divider are respectively connected to the phase detector.

[0007] The parameter extraction circuit includes a first operational amplifier, a second operational amplifier, a comparator, a tri-state gate, and a digital-to-analog converter. The inverting input of the first operational amplifier is connected to a digital phase-locked loop synchronization circuit, and its non-inverting input is grounded. The output of the first operational amplifier is connected to the non-inverting input of the comparator. The non-inverting input of the second operational amplifier is connected to the digital-to-analog converter. The output of the second operational amplifier is connected to the inverting input of the comparator. The output of the comparator is connected to the second input of the tri-state gate. The first input of the tri-state gate is connected to a negative voltage. The third input of the tri-state gate is connected to a processor unit. The output of the tri-state gate is connected to the digital-to-analog converter.

[0008] In a specific implementation, both the first operational amplifier and the second operational amplifier are of the LM324 model.

[0009] The comparator model is AD5861.

[0010] The tri-state gate is model 74LS245.

[0011] To enable remote monitoring, the wireless communication component is used to communicate and interconnect with a remote monitoring platform.

[0012] Beneficial Effects: This utility model is a droop control and monitoring system for parallel DC-DC converters. Through the coordinated operation of the droop control module, the converter control module, and the signal monitoring module, it achieves current sharing control of the interleaved parallel DC-DC converter system, ensuring maximum power output and improving energy efficiency. The signal monitoring module can collect and process the PWM control signal output by the converter control module in real time. When a signal deviation is detected, it immediately triggers the droop control module to adjust, thereby ensuring the consistency of the control signals received by each DC-DC converter and improving the stability and reliability of the system. Simultaneously, the application of a digital phase-locked loop synchronization circuit and a parameter extraction circuit enables the signal monitoring module to accurately extract the parameters of the PWM control signal and compare them with preset thresholds, further improving the system's monitoring accuracy and response speed. Attached Figure Description

[0013] Figure 1 This is a structural diagram of a parallel DC-DC converter droop control and monitoring system.

[0014] Figure 2 This is a schematic diagram of a digital phase-locked loop synchronization circuit.

[0015] Figure 3 The circuit diagram for parameter extraction. Detailed Implementation

[0016] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0017] Example

[0018] This embodiment provides a droop control and monitoring system for a parallel DC-DC converter, which is electrically connected to an interleaved parallel DC-DC converter system. The interleaved parallel DC-DC converter system consists of several DC-DC converters connected in parallel. This droop control and monitoring system is used to output control signals to perform current sharing control on the interleaved parallel DC-DC converter system, so that the interleaved parallel DC-DC converter system can achieve maximum power output.

[0019] See Figure 1 The parallel DC-DC converter droop control and monitoring system includes a droop control module, a converter control module, and a signal monitoring module. The input of the droop control module is electrically connected to the interleaved parallel DC-DC converter system, and its output is connected to the converter control module. The droop control module detects the electrical signals of each DC-DC converter, generates a droop control signal that acts on the interleaved parallel DC-DC converters to ensure current sharing, and transmits this droop control signal to the converter control module. The converter control module converts this signal into a PWM control signal to drive the interleaved parallel DC-DC converter system. The output of the converter control module is electrically connected to each DC-DC converter in the interleaved parallel DC-DC converter system. The converter control module transmits the PWM control signal to each DC-DC converter to control them to operate at the same frequency.

[0020] Meanwhile, in order to detect the consistency of the output signal of the droop control module and prevent deviations in the PWM control signals received by each DC-DC converter, the input terminal of the signal monitoring module is electrically connected to the output terminal of the converter control module, and its output terminal is electrically connected to the droop control module. The signal monitoring module collects the PWM control signal output by the converter control module in real time, performs signal processing and detection, and when it detects that there is an abnormal deviation in the PWM control signal received by each DC-DC converter, the signal monitoring module generates a trigger signal and transmits it to the droop control module for signal adjustment and correction.

[0021] To detect PWM control signals, the signal monitoring module includes a digital phase-locked loop (PLL) synchronization circuit, a parameter extraction circuit, a processor unit, and a wireless communication component. The PLL synchronization circuit is connected to the parameter extraction circuit, and the processor unit is electrically connected to both the parameter extraction circuit and the wireless communication component. The PLL synchronization circuit tracks and acquires the PWM control signals and performs phase synchronization. The parameter extraction circuit extracts signal parameters from the acquired PWM control signals. The processor unit processes and judges the extracted signal parameters by comparing the parameter data of the PWM control signals with thresholds to determine whether there is a deviation in each PWM control signal. When the processor unit detects an abnormality in the PWM control signal output by the converter control module, it can transmit the abnormal signal to the droop control module, prompting the droop control module to adjust the droop coefficient.

[0022] like Figure 2 As shown, the digital phase-locked loop synchronization circuit includes a zero-crossing detection circuit, a phase detector, a controller, a clock circuit, and a frequency divider. The output of the zero-crossing detection circuit is connected to the input of the phase detector. The first and second outputs of the phase detector are electrically connected to the controller. The first and second inputs of the clock circuit are electrically connected to the controller. The output of the controller is connected to the input of the frequency divider. The first and second outputs of the frequency divider are respectively connected to the phase detector. The input of the zero-crossing detection circuit acquires the output signal of the converter control module. The PWM control signal, after passing through the zero-crossing detection circuit, generates a narrow pulse sequence, which is then input to the phase detector for phase detection. The clock circuit generates two pulse signals with a phase difference, which are input to the controller. The controller transmits these signals to the frequency divider. When the pulse phase input from the frequency divider to the phase detector leads the narrow pulse sequence, the first output terminal of the phase detector outputs a signal. After receiving the signal from the first output terminal, the controller reduces the pulse sequence input to the frequency divider by one pulse, causing the pulse phase of the frequency divider to fall back. If the pulse phase after frequency division is lagging behind the narrow pulse sequence, the second output terminal of the phase detector outputs a signal, and the pulse sequence input from the controller to the frequency divider increases by one pulse, causing the pulse phase of the frequency divider to advance, until there are no output signals at either output terminal of the phase detector, and the signal is locked and tracked.

[0023] After the digital phase-locked loop synchronization circuit completes the tracking and synchronization of the converter control module's output signal, the parameter extraction circuit extracts parameters from the acquired output signal. For example... Figure 3As shown, the parameter extraction circuit includes a first operational amplifier, a second operational amplifier, a comparator, a tri-state gate, and a digital-to-analog converter (DAC). The first and second operational amplifiers are both LM324, the comparator is an AD5861, and the tri-state gate is a 74LS245. The inverting input of the first operational amplifier is connected to a digital phase-locked loop (PLL) synchronization circuit, and its non-inverting input is grounded. The output of the first operational amplifier is connected to the non-inverting input of the comparator. The non-inverting input of the second operational amplifier is connected to the DAC, receiving the analog signal converted from the digital signal. The output of the second operational amplifier is connected to the inverting input of the comparator. The output of the comparator is connected to the second input of the tri-state gate. The first input of the tri-state gate is connected to a negative voltage. The third input of the tri-state gate is connected to the processor unit, and the output of the tri-state gate is connected to the DAC. After the PLL synchronization circuit completes the tracking and synchronization of the converter control module's output signal, the parameter extraction circuit begins operation. The inverting input of the first operational amplifier receives a signal from the digital phase-locked loop synchronization circuit, while its non-inverting input is grounded. Because the inverting input is grounded, it acts as a follower, outputting a signal that is the same as the input signal but in opposite phase. The output signal of the first operational amplifier is sent to a comparator, which detects the voltage difference between its two inputs and outputs a corresponding logic level signal. The comparator outputs a high or low level signal based on the voltage difference between its two inputs. If the voltage at the non-inverting input is higher than that at the inverting input, it outputs a high level; otherwise, it outputs a low level. The first input of the tri-state gate is connected to a negative voltage to set the output state of the tri-state gate when it is inactive. The third input of the tri-state gate receives a control signal from the processor unit to control the output state of the tri-state gate. The tri-state gate receives the output signal from the comparator. When the tri-state gate is activated, its output will output a corresponding logic level signal based on the comparator's output signal, or it will output a high-impedance state when inactive. The output of the tri-state gate is connected to a digital-to-analog converter (DAC), which receives the output signal from the tri-state gate and performs analog-to-digital conversion. Through the above process, the parameter extraction circuit can extract the required parameters from the output signal of the converter control module and convert them into digital signals that can be processed by the processor unit.

[0024] In addition, the signal monitoring module can communicate with the remote monitoring platform through a wireless communication component, and can upload the monitoring data and abnormal signals of the signal monitoring module to the remote monitoring platform to realize remote monitoring.

Claims

1. A droop control and monitoring system for parallel DC-DC converters, electrically connected to an interleaved parallel DC-DC converter system, wherein the interleaved parallel DC-DC converter system comprises a plurality of DC-DC converters connected in parallel, characterized in that, The parallel DC-DC converter droop control and monitoring system includes a droop control module, a converter control module, and a signal monitoring module. The input terminal of the droop control module is electrically connected to the interleaved parallel DC-DC converter system, and its output terminal is connected to the converter control module. The output terminal of the converter control module is electrically connected to each DC-DC converter in the interleaved parallel DC-DC converter system. The input terminal of the signal monitoring module is electrically connected to the output terminal of the converter control module, and its output terminal is electrically connected to the droop control module.

2. The parallel DC-DC converter droop control and monitoring system according to claim 1, characterized in that, The signal monitoring module includes a digital phase-locked loop synchronization circuit, a parameter extraction circuit, a processor unit, and a wireless communication component. The digital phase-locked loop synchronization circuit is connected to the parameter extraction circuit, and the processor unit is electrically connected to both the parameter extraction circuit and the wireless communication component.

3. The parallel DC-DC converter droop control and monitoring system according to claim 2, characterized in that, The digital phase-locked loop synchronization circuit includes a zero-crossing detection circuit, a phase detector, a controller, a clock circuit, and a frequency divider. The output of the zero-crossing detection circuit is connected to the input of the phase detector. The first and second outputs of the phase detector are electrically connected to the controller. The first and second inputs of the clock circuit are electrically connected to the controller. The output of the controller is connected to the input of the frequency divider. The first and second outputs of the frequency divider are respectively connected to the phase detector.

4. The parallel DC-DC converter droop control and monitoring system according to claim 2, characterized in that, The parameter extraction circuit includes a first operational amplifier, a second operational amplifier, a comparator, a tri-state gate, and a digital-to-analog converter. The inverting input of the first operational amplifier is connected to a digital phase-locked loop synchronization circuit, and its non-inverting input is grounded. The output of the first operational amplifier is connected to the non-inverting input of the comparator. The non-inverting input of the second operational amplifier is connected to the digital-to-analog converter. The output of the second operational amplifier is connected to the inverting input of the comparator, the output of the comparator is connected to the second input of the tri-state gate, the first input of the tri-state gate is connected to a negative voltage, the third input of the tri-state gate is connected to the processor unit, and the output of the tri-state gate is connected to the digital-to-analog converter.

5. The parallel DC-DC converter droop control and monitoring system according to claim 4, characterized in that, Both the first operational amplifier and the second operational amplifier are LM324.

6. The parallel DC-DC converter droop control and monitoring system according to claim 4, characterized in that, The comparator model is AD5861.

7. The parallel DC-DC converter droop control and monitoring system according to claim 4, characterized in that, The tri-state gate is model 74LS245.

8. The parallel DC-DC converter droop control and monitoring system according to claim 2, characterized in that, The wireless communication component is used for communication and interconnection with the remote monitoring platform.

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