Multi-path direct current power supply

Abstract

The utility model discloses a multipath direct current power supply, which relates to the technical field of power supplies and comprises a power supply case used for installing and protecting internal components; the plurality of output connectors are used for providing a plurality of independent direct current outputs; and the voltage conversion module control board is used for controlling the working state of the voltage conversion module and receiving and processing the voltage and current signals. The multipath DC power supply is equipped with a plurality of output connectors and a filtering design in hardware design, so that output ripple voltage is significantly reduced, voltage and power stability is ensured, and the multipath DC power supply is suitable for a high-altitude low-pressure environment. A modular design is adopted, each path of power supply is independently controlled, and the power utilization quality is improved through a current-sharing bus and a far-end compensation function. The upgraded 7-inch display screen replaces a traditional meter head, the display content is adjustable, and the intelligent development trend is met. A second-order filter and a PFC control circuit are added at the input end, so that the power factor is improved, and the exchange power loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a multi-channel direct current power supply. Background Art

[0002] AC / DC conversion is the conversion of AC to DC, and its power flow can be bidirectional. The power flow from the power supply to the load is called "rectification", and the power flow from the load back to the power supply is called "active inversion". The input of AC / DC converter is 50 / 60Hz AC, which must be rectified and filtered, so a relatively large filter capacitor is indispensable. At the same time, due to the restrictions of safety standards (such as UL, CCEE, etc.) and EMC directives (such as IEC, FCC, CSA), EMC filtering must be added to the AC input side and components that meet safety standards must be used, which limits the miniaturization of AC / DC power supply. In addition, due to the internal high-frequency, high-voltage, and high-current switching action, it is more difficult to solve the EMC electromagnetic compatibility problem, which also puts forward high requirements for the internal high-density installation circuit design. For the same reason, high-voltage and high-current switches increase the power supply working loss, limiting the modularization process of AC / DC converters.

[0003] The prior art has the following deficiencies:

[0004] The existing AC / DC conversion technology has the following shortcomings in multi-channel DC power supply: low output current, voltage and power, single output number, unable to meet the power needs of multiple devices at the same time; lack of current equalization and perfect protection mechanism, resulting in shortened equipment life; traditional design using DSP controller is prone to single point failure, resulting in failure of the entire power supply system; limited display function, digital display head display content is small and poor flexibility, difficult to monitor the output voltage, current and power of each channel in real time; large output ripple, low efficiency, simple RC filtering treatment is difficult to effectively improve the output voltage purity and power efficiency. Therefore, an improved multi-channel DC power supply is needed to solve the above shortcomings and improve the stability, reliability and intelligence level of the system.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Utility Model Content

[0006] The purpose of the utility model is to provide a multi-channel DC power supply to solve the problems in the above-mentioned background technology.

[0007] In order to achieve the above object, the utility model provides the following technical solution: a multi-channel DC power supply, comprising:

[0008] Power supply chassis, used to mount and protect internal components;

[0009] Output connectors, provided in plurality, for providing a plurality of independent DC outputs;

[0010] The voltage conversion module control board is used to control the working state of the voltage conversion module and receive and process voltage and current signals;

[0011] A current sampling circuit is used to sample the current signals output from each channel;

[0012] A voltage sampling circuit is used to sample the voltage signals output from each channel;

[0013] The voltage compensation circuit is used to compensate the output voltage to ensure the stability of the output voltage;

[0014] Current balancing circuit, used for current balancing of each output;

[0015] Second-order filter, used to filter out high-frequency interference in the input voltage and reduce output ripple;

[0016] PFC control circuit, used to improve the power factor and reduce the phase difference between current and voltage;

[0017] Display screen, used to display the parameters of each output;

[0018] Network transmission interface for remote control and monitoring;

[0019] The start control device includes a mechanical button and a network power on / off control to start and shut down the power supply.

[0020] Preferably, the display screen is a 7-inch display screen, which displays the voltage, current and power of each part, and adjusts or changes the display content according to user needs.

[0021] Preferably, the current balancing circuit achieves balancing of the output currents of various paths through a current balancing bus, and adds a remote compensation function to compensate for line losses, thereby improving the quality and efficiency of electricity use.

[0022] Preferably, the start control device includes a mechanical button and a network power on / off control, and the two control modes do not affect each other.

[0023] Preferably, the voltage conversion module control board receives and processes voltage and current signals through voltage and current sampling circuits, and adjusts the output voltage and current of the voltage conversion module according to the feedback signals.

[0024] Preferably, the second-order filter and the PFC control circuit are used to improve the power factor of the power supply and reduce the exchange power loss.

[0025] Preferably, the network transmission interface is connected to the MCU via the TCP / IP protocol to achieve remote monitoring and control.

[0026] Preferably, the power supply chassis is suitable for high altitude and low pressure environments, and the selected components can work normally in areas with an altitude of ≤4500 meters.

[0027] Preferably, the output connector includes at least three independent output connectors, which can provide stable DC power to multiple devices at the same time.

[0028] Preferably, the power supply has multiple protection mechanisms, including over-current protection, over-voltage protection and short-circuit protection, to improve the safety and stability of the power supply.

[0029] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0030] Traditional output channels are generally single or dual. For the single output port, the utility model has multiple output connectors in hardware design to connect more electrical equipment. This design can also meet the needs of more occasions. In addition, the output is filtered in hardware, which greatly reduces the ripple voltage during output and further ensures the stability of output voltage and power. When selecting devices, the environmental requirements of high altitude and low air pressure are also optimized accordingly. The selected devices can meet the normal operation in areas with an altitude of ≤4500m.

[0031] The utility model adopts a modular design concept. Each power supply control is controlled by an independent control unit. The current equalization purpose is achieved through a current equalization bus. At the same time, a remote compensation function is added to compensate for line losses and improve power quality and efficiency.

[0032] Traditional power supply products only have one status indicator light or add a digital voltage and current meter. The design concept is single and backward. In view of this situation, the utility model has upgraded the existing products: a 7-inch display screen is used to replace the traditional voltage and current meter, which can not only display the voltage and current of each part at the same time, but also display the power of each output and the temperature inside the power supply. At the same time, the display content can be adjusted or changed according to user needs to meet user needs. Such a design is not only intuitive and convenient, but also in line with the development direction of today's power supply intelligence.

[0033] The traditional method is to perform simple RC filtering on the output end of the power supply. For a power supply with higher power, the parameters of RC will change accordingly, and the parameter selection and determination are also very inconvenient. Finally, the output ripple problem cannot be solved well. For this reason, the utility model is designed to add a second-order filter and a PFC control circuit at the input end, which improves the power factor and reduces the loss of exchange power caused by the phase difference between current and voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0035] Figure 1 This is a block diagram of a multi-channel DC power supply system of the utility model.

[0036] Figure 2 This is a voltage sampling circuit of the utility model.

[0037] Figure 3 The utility model discloses a voltage conversion module control board circuit.

[0038] Figure 4 This is a wiring diagram of components in the current sampling circuit of the utility model.

[0039] Figure 5 The schematic diagram is a schematic diagram of the sampling signal transmission path in the current sampling circuit of the utility model. DETAILED DESCRIPTION

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present disclosure will be more comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art.

[0041] The utility model provides Figures 1 to 5 The multi-channel DC power supply shown includes:

[0042] Power supply chassis, used to mount and protect internal components;

[0043] Output connectors, provided in plurality, for providing a plurality of independent DC outputs;

[0044] The voltage conversion module control board is used to control the working state of the voltage conversion module and receive and process voltage and current signals;

[0045] A current sampling circuit is used to sample the current signals output from each channel;

[0046] A voltage sampling circuit is used to sample the voltage signals output from each channel;

[0047] The voltage compensation circuit is used to compensate the output voltage to ensure the stability of the output voltage;

[0048] Current balancing circuit, used for current balancing of each output;

[0049] Second-order filter, used to filter out high-frequency interference in the input voltage and reduce output ripple;

[0050] PFC control circuit, used to improve the power factor and reduce the phase difference between current and voltage;

[0051] Display screen, used to display the parameters of each output;

[0052] Network transmission interface for remote control and monitoring;

[0053] The start control device includes a mechanical button and a network power on / off control to start and shut down the power supply.

[0054] The power startup methods include mechanical button control and network power on / off control. The two control methods do not affect each other, realizing flexible startup control.

[0055] Mechanical button control: The system uses the AIP74HC74SA.TR trigger. When PB10 is low and PB11 is high, the POWER3 pin outputs a low level. Pulling PB10 to a high level does not change the output state. When both PB10 and PB11 are high, the output POWER3 will trigger switching according to the rising edge signal of the SW3 pin. Connect the PB10 and PB11 pins to the IO port of the MCU to achieve two control methods.

[0056] Front panel switch control: After powering up according to the logic of outputting POWER3 low level, both PB10 and PB11 are pulled high. Pin 2 of the front panel switch is connected to SW3, and pin 1 of the switch is connected to 3.3V high level. When the switch is pressed, the switch pins 1 and 2 are short-circuited. At this time, a rising edge signal is given to the SW3 pin of the trigger, triggering the state switching of POWER3.

[0057] Network power on / off control:

[0058] Ethernet control: Ethernet connects to MCU via TCP / IP protocol, and controls the pull-up or pull-down state of PB10 and PB11 through command characters, thereby controlling the state of output POWER3. The output state of the POWER3 pin is connected to the Darlington transistor, and its output state is the inversion of the input. When the POWER3 pin of the RS trigger outputs a low level, the Darlington transistor outputs a high level, which is connected to one end of the relay coil, and the other end of the relay coil is connected to 3.3V. At this time, the relay does not attract. Conversely, when the RS trigger outputs a high level, the Darlington transistor outputs a low level, and the relay attracts.

[0059] Voltage conversion module control: When the voltage conversion module control board receives the power-on signal, it will send instructions to the voltage conversion module. At this time, the module outputs a series of electrical parameters such as voltage and current and transmits them back to the voltage conversion module control board, waiting for these signals to be further processed.

[0060] Voltage and current sampling: The voltage sampling circuit and the current sampling circuit will receive the voltage signal from the voltage conversion module control board, process it, and determine the specific values ​​of the voltage and current at this time. The main function of the voltage sampling circuit is to monitor the voltage value of each output in real time to ensure the accuracy and stability of the output voltage. The current sampling circuit is responsible for monitoring the current value of each output to prevent overload or short circuit.

[0061] Feedback and adjustment: The specific value is transmitted to the voltage feedback circuit, and after processing and judgment by the voltage feedback circuit, the final result is fed back to the voltage conversion module control board. The control board adjusts the output voltage and current of the voltage conversion module according to the value of the feedback end to ensure that the output voltage and current are stable within the set range. This process includes real-time monitoring and adjustment of voltage and current to ensure the stability and reliability of power supply output.

[0062] Display and monitoring: The voltage, current and power values ​​of each output are displayed on the synchronous display screen, and the user can monitor the working status of the power supply in real time. The display screen not only provides the voltage and current values, but also displays the power, temperature and other parameters of each output. The display content can be adjusted according to user needs to improve the user experience and the intuitiveness of the system.

[0063] Protection mechanism: The power supply also has multiple protection mechanisms, including overcurrent protection, overvoltage protection and short circuit protection. When an abnormal situation is detected, the system will automatically take corresponding protection measures to prevent equipment damage. The application of the protection mechanism ensures the safety and stability of the power supply under various abnormal conditions, prolongs the service life of the equipment and improves the reliability of the system.

[0064] Remote control: The network transmission interface connects to the MCU via the TCP / IP protocol to achieve remote monitoring and control. Users can remotely start and shut down the power supply and monitor the working status of the power supply through the network. The remote control function improves the flexibility and convenience of the power supply system and is suitable for various applications that require remote management, such as data centers, communication base stations, etc.

[0065] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. Multi-channel DC power supply, characterized in that: include: Power supply chassis, used to mount and protect internal components; Output connectors, provided in plurality, for providing a plurality of independent DC outputs; The voltage conversion module control board is used to control the working state of the voltage conversion module and receive and process voltage and current signals; A current sampling circuit is used to sample the current signals output from each channel; A voltage sampling circuit is used to sample the voltage signals output from each channel; The voltage compensation circuit is used to compensate the output voltage to ensure the stability of the output voltage; Current balancing circuit, used for current balancing of each output; Second-order filter, used to filter out high-frequency interference in the input voltage and reduce output ripple; PFC control circuit, used to improve the power factor and reduce the phase difference between current and voltage; Display screen, used to display the parameters of each output; Network transmission interface for remote control and monitoring; The start control device includes a mechanical button and a network power on / off control to start and shut down the power supply.

2. The multi-channel DC power supply according to claim 1, characterized in that: The display screen is a 7-inch display screen that displays the voltage, current and power of each part, and adjusts or changes the display content according to user needs.

3. The multi-channel DC power supply according to claim 1, characterized in that: The current balancing circuit achieves the balancing of the output currents of various paths through the current balancing bus, and adds a remote compensation function to compensate for line losses, thereby improving the quality and efficiency of power consumption.

4. The multi-channel DC power supply according to claim 1, characterized in that: The start control device includes a mechanical button and a network power on / off control, and the two control modes do not affect each other.

5. The multi-channel DC power supply according to claim 1, characterized in that: The voltage conversion module control board receives and processes voltage and current signals through voltage and current sampling circuits, and adjusts the output voltage and current of the voltage conversion module according to the feedback signals.

6. The multi-channel DC power supply according to claim 1, characterized in that: The second-order filter and the PFC control circuit are used to improve the power factor of the power supply and reduce the exchange power loss.

7. The multi-channel DC power supply according to claim 1, characterized in that: The network transmission interface is connected to the MCU via the TCP / IP protocol to achieve remote monitoring and control.

8. The multi-channel DC power supply according to claim 1, characterized in that: The power supply chassis is suitable for high altitude and low pressure environments, and the selected components can work normally in areas with an altitude of ≤4500 meters.

9. The multi-channel DC power supply according to claim 1, characterized in that: The output connector includes at least three independent output connectors, which can provide stable DC power to multiple devices at the same time.

10. The multi-channel DC power supply according to claim 1, characterized in that: The power supply has multiple protection mechanisms, including over-current protection, over-voltage protection and short-circuit protection, to improve the safety and stability of the power supply.

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