Digital power supply capable of automatically switching alternating current input function and direct current input function

Abstract

The invention provides a digital power supply capable of automatically switching AC and DC input functions, which comprises a modular input circuit, a digital control logic module and a CRPS standard compatible module, and is characterized in that the digital input circuit comprises a switchable AC / DC module, a switchable DC / DC module and an input detection identification circuit; input paths are switched through the digital control logic module, the digital control logic module comprises a switching circuit and a power supply controller, and the CRPS standard compatible module comprises a standard input interface, a standard slot, a standard communication interface and a standard DC / DC converter. According to the digital power supply, AC / DC input function switching is achieved through modular input circuit, digital control logic and CRPS standard compatible design, and the compatibility and redundancy capacity of a power supply system can be remarkably improved through module replacement, so that AC or DC input function switching is achieved.

Description

Technical Field

[0001] The present invention relates to a power supply technology, in particular to a digital power supply with automatic switching between AC and DC input functions. Background Art

[0002] A CRPS (Common Redundant Power Supply) is a high-efficiency, high-power power supply with fully digital control, a redundant design, and multiple input options. It is commonly used in redundant power systems for servers and data centers, providing stable power to a large number of devices, including servers, storage devices, and network switches, meeting the high energy consumption and high reliability requirements of data centers and other environments. The redundant design typically consists of at least two hot-swappable modules. During normal operation, each module shares the system load. If one module fails, the remaining module can take over the entire load, ensuring uninterrupted system operation. Traditional AC / DC and DC / DC power supplies have different inputs. AC input typically requires rectification and power factor correction (PFC), while DC input requires different voltage ranges and filtering. Switching between AC and DC input functionality through module replacement is a common challenge in the industry.

[0003] Module replacement requires consideration of interface compatibility. CRPS power supplies have standard dimensions and interfaces, and replacement modules must comply with interface specifications to ensure they can be plugged into existing power outlets. This means that input and output connectors and pins must be compatible, or alternatively, switchable contacts must be used to accommodate different input types. Input detection and automatic switching are key functions for module replacement. The power supply must be able to automatically identify whether the input is AC or DC and switch to the appropriate processing circuit. At this point, the digital control circuit controls the switch based on the processing circuit's output, switching the input path to the appropriate module, either the rectifier / PFC module or the DC / DC module.

[0004] In the prior art, two conversion schemes are designed within the power supply for alternating current (AC) and high-voltage direct current (DC) inputs, respectively. Isolated AC / DC conversion is used for AC input, and isolated DC / DC conversion is used for DC input, thereby achieving optimal efficiency under different input standards. However, the power supply implemented by this scheme is large in area and high in cost. As a commonly used alternative, a two-stage PFC+DC / DC conversion scheme compatible with both input standards is selected. Under either AC or high-voltage DC input, the power is output after undergoing two-stage power conversion, PFC and DC / DC. For high-voltage DC input, the solution to achieve optimal efficiency is to directly use a single-stage DC / DC conversion for output. That is, the above-mentioned compatible solution introduces a PFC conversion branch, which increases losses and reduces efficiency under high-voltage DC input.

[0005] There is an urgent need in the prior art for a digital power supply that can automatically switch between AC and DC input functions through modular input circuits, digital control logic, and CRPS standard compatible design. Summary of the Invention

[0006] In view of the technical problems existing in the prior art, the present invention aims to provide a digital power supply that realizes switching between AC and DC input functions through modular input circuits, digital control logic and CRPS standard compatible design, which can significantly improve the compatibility and redundancy capabilities of the power supply system.

[0007] Specifically, the present invention provides a digital power supply with automatic switching between AC and DC input functions, characterized in that it includes a modular input circuit, a digital control logic module, and a CRPS standard-compliant module. The digital input circuit includes a switchable AC / DC module and a DC / DC module and an input detection and identification circuit. The input path is switched through the digital control logic module. The digital control logic module includes a switching circuit and a power supply controller. The CRPS standard-compliant module includes a standard input interface, a standard slot, a standard communication interface, and a standard DC / DC converter.

[0008] According to the present invention, the feature is that the mechanical dimensions and electrical pins of AC and DC input modules are compatible through a unified standard input interface.

[0009] According to the present invention, it is characterized in that, in the modular input circuit, the AC voltage and the DC voltage are selected to ensure the pluggable compatibility of the module.

[0010] According to the present invention, it is characterized in that the input detection and identification circuit includes a hardware detection circuit.

[0011] According to the present invention, it is characterized in that AC / DC input is distinguished by voltage sampling and waveform detection.

[0012] According to the present invention, it is characterized in that the AC / DC input is distinguished by RMS detection or zero-crossing detection.

[0013] According to the present invention, it is characterized in that for AC input, a sinusoidal wave characteristic or frequency is detected, and for DC input, a steady-state voltage value is detected.

[0014] According to the present invention, it is characterized in that the switching circuit uses MOSFET, relay / solid-state switch (SSR) to switch the input path.

[0015] According to the present invention, it is characterized in that when the switching circuit is in AC mode, the SSR turns on the AC path and turns off the DC path; when the switching circuit is in DC mode, the SSR turns on the DC path and turns off the AC path.

[0016] According to the present invention, it is characterized in that the switching circuit inputs the rectifier bridge and the PFC circuit for processing in the AC mode to generate a high-voltage DC bus. In the DC mode, the DC input is directly adjusted to the intermediate bus voltage after filtering and enters the DC / DC converter shared with the AC mode.

[0017] According to the present invention, it is characterized in that the digital control logic module outputs a driving signal through an MCU / PWM controller, thereby controlling the switch logic.

[0018] According to the present invention, it is characterized in that the CRPS power supply further includes an output interface, a communication control circuit and a display circuit.

[0019] According to the present invention, it is characterized in that the communication interface supports communication with the host (reporting input mode, voltage and temperature, etc.) by integrating the PMBus protocol and the built-in I²C serial interface.

[0020] According to the present invention, it is characterized in that the input interface and the output interface are respectively connected to the communication control circuit.

[0021] According to the present invention, it is characterized in that there are two or more input interfaces and two or more output interfaces.

[0022] According to the present invention, the feature is that the display circuit is connected to the communication control circuit.

[0023] According to the present invention, it is characterized in that it further comprises: an input EMI circuit, an input rectification and filtering circuit, an output EMI circuit and an output filtering circuit.

[0024] According to the present invention, it is characterized in that it also includes a first bus; the first bus connects the communication control circuit and the first communication interface, and a second bus; the second bus connects the communication control circuit and the second communication interface, and the first bus and the second bus are both CAN buses.

[0025] According to the present invention, it is characterized in that the switching circuit includes a PFC circuit, a transformer isolation circuit and a PWM control circuit; the PFC circuit and the transformer isolation circuit are respectively connected to the PWM control circuit.

[0026] According to the present invention, it is characterized in that it also includes an input switching circuit and an output switching circuit, the input switching circuit includes a relay and a control circuit, and the control circuit is connected to the relay; the output switching circuit is connected to the output filter circuit; the output switching circuit includes a relay and a control circuit, and the control circuit is connected to the relay.

[0027] According to the present invention, it is characterized in that the AC input of the input interface supports 90-264V AC, frequency 50-60Hz, and is connected through an EMI filter, and the DC input supports 200-400VDC and is connected through a polarity protection circuit and an input filter circuit.

[0028] According to the present invention, it is characterized in that it also includes a protection circuit, which prevents input surge by connecting a TVS diode.

[0029] According to the present invention, due to the modular input circuit, digital control logic and CRPS standard compatible design, AC / DC input function switching can be achieved, which can significantly improve the compatibility and redundancy capability of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The module structure diagram of a digital power supply with automatic switching between AC and DC input functions according to a specific embodiment of the present invention is shown.

[0031] Among them, 1-input interface, 2-input detection and identification circuit, 3-switching circuit, 4-power controller, 5-DC / DC converter. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below in combination with specific embodiments with reference to the accompanying drawings. However, the description is exemplary, and the present invention is not limited to the specific embodiments.

[0033] Figure 1 The module structure diagram of the digital power supply with automatic switching between AC and DC input functions according to a specific embodiment of the present invention is shown in FIG. Figure 1 As shown, an embodiment of the present invention provides a digital power supply with automatic switching between AC and DC input functions, including a modular input circuit, a digital control logic module, and a CRPS standard compatible module. In this specific embodiment, the digital input circuit includes a switchable AC / DC module and a DC / DC module and an input detection and identification circuit 2, and the input path is switched by the digital control logic module. The digital control logic module includes a switching circuit 3 and a power supply controller 4. The CRPS standard compatible module includes a standard input interface 1, a standard slot, a standard communication interface and a standard DC / DC converter 5.

[0034] In the present invention, the mechanical dimensions and electrical pins of AC and DC input modules are compatible through a unified standard input interface 1. In the modular input circuit, the AC voltage and the DC voltage are selected to ensure the pluggable compatibility of the modules.

[0035] In the present invention, the input detection and identification circuit 2 includes a hardware detection circuit. In a preferred embodiment, AC / DC input is distinguished through voltage sampling and waveform detection. Further preferably, AC / DC input is distinguished through RMS detection or zero-crossing detection. For AC input, the sinusoidal wave characteristics or frequency are detected, and for DC input, the steady-state voltage value is detected.

[0036] In this invention, the switching circuit uses MOSFETs and relays / solid-state switches (SSRs) to switch the input path. In AC mode, the SSRs conduct the AC path and shut down the DC path. In DC mode, the SSRs conduct the DC path and shut down the AC path. In AC mode, the switching circuit receives input from a rectifier bridge and a PFC circuit, where it is processed to generate a high-voltage DC bus. In DC mode, the DC input is filtered and directly adjusted to an intermediate bus voltage, which is shared with the AC mode DC / DC converter. An MCU / PWM controller outputs drive signals to control the SSR switching logic.

[0037] In a preferred embodiment of the present invention, the CRPS power supply further includes an output interface, a communication control circuit, and a display circuit. The communication interface supports communication with a host computer (reporting input mode, voltage, temperature, etc.) via an integrated PMBus protocol and a built-in I²C serial interface. The input interface and the output interface are each electrically connected to the communication control circuit. In a preferred embodiment, two or more input interfaces and output interfaces are provided. In a preferred embodiment, the display circuit is connected to the communication control circuit.

[0038] In a preferred embodiment, the system further includes: an input EMI circuit, an input rectification and filtering circuit, an output EMI circuit, and an output filtering circuit.

[0039] In a preferred embodiment, it also includes a first bus; the first bus connects the communication control circuit and the first communication interface, and a second bus; the second bus connects the communication control circuit and the second communication interface, and the first bus and the second bus are both CAN buses.

[0040] In the present invention, the switching circuit further includes a PFC circuit, a transformer isolation circuit, and a PWM control circuit; the PFC circuit and the transformer isolation circuit are respectively connected to the PWM control circuit. In a preferred embodiment, the switching circuit further includes an input switching circuit and an output switching circuit, the input switching circuit including a relay and a control circuit, the control circuit being connected to the relay; the output switching circuit being connected to the output filter circuit; and the output switching circuit including a relay and a control circuit, the control circuit being connected to the relay.

[0041] In this invention, the input interface's AC input supports 90-264V AC, 50-60Hz frequency, and is connected through an EMI filter. The DC input supports 200-400V DC and is connected through a polarity protection circuit and input filtering circuit. In a preferred embodiment, a protection circuit is also included, using a TVS diode to prevent input surges.

[0042] Due to the modular input circuit, digital control logic and CRPS standard compatible design, the present invention can realize AC / DC input function switching and significantly improve the compatibility and redundancy capability of the power supply system.

Claims

1. A digital power supply with automatic switching between AC and DC input functions, characterized in that: The device comprises a modular input circuit, a digital control logic module, and a CRPS standard-compliant module. The digital input circuit comprises a switchable AC / DC module, a DC / DC module, and an input detection and identification circuit. The input path is switched via the digital control logic module. The digital control logic module comprises a switching circuit and a power controller. The CRPS standard-compliant module comprises a standard input interface, a standard slot, a standard communication interface, and a standard DC / DC converter.

2. The digital power supply according to claim 1, wherein: The input detection and identification circuit includes a hardware detection circuit, which distinguishes AC / DC inputs through voltage sampling and waveform detection.

3. The digital power supply according to claim 1 or 2, characterized in that: The switching circuit uses MOSFET and relay / solid-state switch SSR to switch the input path. In AC mode, the SSR turns on the AC path and turns off the DC path. In DC mode, the SSR turns on the DC path and turns off the AC path.

4. The digital power supply according to claim 3, wherein: It also includes an output interface, a communication control circuit and a display circuit. The communication interface supports communication with the host through an integrated PMBus protocol and a built-in I²C serial interface. The display circuit is connected to the communication control circuit.

5. The digital power supply according to claim 4, wherein: Also includes: Input EMI circuit, input rectifier filter circuit, output EMI circuit and output filter circuit.

6. The digital power supply according to claim 1 or 2, characterized in that: The switching circuit further includes a PFC circuit, a transformer isolation circuit and a PWM control circuit; the PFC circuit and the transformer isolation circuit are respectively connected to the PWM control circuit.

7. The digital power supply according to claim 6, wherein: It also includes an input switching circuit and an output switching circuit, the input switching circuit includes a relay and a control circuit, and the control circuit is connected to the relay; the output switching circuit is connected to the output filter circuit; the output switching circuit includes a relay and a control circuit, and the control circuit is connected to the relay.

8. The digital power supply according to claim 5, wherein: The AC input of the input interface supports 90-264VAC, frequency 50-60Hz, and is connected through an EMI filter. The DC input supports 200-400VDC and is connected through a polarity protection circuit and an input filter circuit.

9. The digital power supply according to claim 2, wherein: The system distinguishes between AC and DC inputs through RMS detection or zero-crossing detection. For AC input, it detects the sinusoidal wave characteristics or frequency, and for DC input, it detects the steady-state voltage value.

10. The digital power supply according to claim 1 or 2, characterized in that: It also includes a protection circuit that prevents input surges by connecting a TVS diode.

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