CN219918717U - PD equipment power supply management device - Google Patents
PD equipment power supply management device Download PDFInfo
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- CN219918717U CN219918717U CN202223611735.7U CN202223611735U CN219918717U CN 219918717 U CN219918717 U CN 219918717U CN 202223611735 U CN202223611735 U CN 202223611735U CN 219918717 U CN219918717 U CN 219918717U
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Abstract
The utility model discloses a power supply management device of PD equipment. The device comprises a DC-DC power supply, a voltage detection module and a PSE control module; the DC-DC power supply supplies power to the PSE control module according to an external power supply; the voltage detection module detects a power supply voltage of the DC-DC power supply for supplying power to the PSE control module, and generates a control signal according to fluctuation of the power supply voltage; and the PSE control power supply sequentially powers up at least two PD devices according to the DC-DC power supply, and the PSE control module cuts off at least one powered-up PD device according to the control signal. The device can keep the connected PD equipment stably working before overload of the POE switch and cut off the PD equipment causing overload, thereby avoiding continuous working abnormality of all PD equipment caused by overload of the POE switch.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a PD equipment power supply management device for stably supplying power to PD equipment by a non-network management type POE switch based on DC-DC power supply.
Background
Along with the rapid development of national economy, POE technology is rapidly popularized, the power consumption requirement of PD equipment is further improved, and the IEEE 802.3bt standard prescribes that POE equipment can provide maximum 71W power for PD equipment, so that the output power of most of non-network management POE switches in the current market cannot reach the full-load requirement, and when a plurality of PD equipment are simultaneously supplied with power to overload a DC-DC power supply, the output voltage of the DC power supply is dropped, so that all connected PD equipment is abnormal in power supply and repeatedly powered down and restarted.
Disclosure of Invention
In view of the above, the embodiment of the utility model discloses a PD equipment power supply management device, which can keep the connected PD equipment stably working and cut off the PD equipment causing overload before overload of the POE switch, so as to avoid continuous working abnormality of all PD equipment caused by overload of the POE switch. The device comprises a DC-DC power supply, a voltage detection module and a PSE control module; the DC-DC power supply is based on the outside the power supply supplies power to the PSE control module; the voltage detection module detects a power supply voltage of the DC-DC power supply for supplying power to the PSE control module, and generates a control signal according to fluctuation of the power supply voltage; and the PSE control power supply sequentially powers up at least two PD devices according to the DC-DC power supply, and the PSE control module cuts off at least one powered-up PD device according to the control signal.
Preferably, in the embodiment of the present utility model, the PSE control module cuts off at least one PD device that causes the supply voltage to fluctuate according to the control signal.
Preferably, in this embodiment of the present utility model, the PSE control module cuts off at least one PD device that occurs within a signal time range of the control signal according to the control signal.
Preferably, in the embodiment of the present utility model, the control signal is at least covered with a timestamp that the supply voltage fluctuates; the PSE control module shuts down at least one of the PD devices within a signal time range of the timestamp.
Preferably, the voltage detection module generates the control signal when comparing the power supply voltage to be greater than at least one upper limit voltage, or generates the control signal when comparing the power supply voltage to be less than at least one lower limit voltage.
Preferably, the voltage detection module comprises a sampling circuit, a proportional modulation circuit, a first comparison circuit, a second comparison circuit, an A/D conversion circuit and a processor; the sampling circuit acquires the power supply voltage output by the DC-DC power supply; the proportion modulation circuit modulates the power supply voltage into a sampling voltage according to at least one scaling ratio; the first comparison circuit compares the sampling voltage with at least one upper limit voltage and outputs a first comparison signal; the second comparison circuit compares the sampling voltage with at least one lower limit voltage and outputs a second comparison signal; the A/D conversion circuit generates a digital signal according to the first comparison signal and the second comparison signal; the processor generates the control signal according to the digital signal and the input time of the digital signal.
Preferably, the proportional modulation circuit comprises a proportional modulation amplifier, a resistor R1, a resistor R2, a resistor R3 and a resistor R4; one input end of the proportional modulation amplifier is grounded through a resistor R1, the other input end of the proportional modulation amplifier is respectively connected to the sampling circuit through a resistor R2 and grounded through a resistor R3, and the output end of the proportional modulation amplifier is grounded through a resistor R4 and a resistor R1 and respectively connected to the first comparison circuit and the second comparison circuit.
Preferably, the first comparing circuit includes at least two first sub comparing circuits; at least two first sub-comparison circuits compare the sampling voltage with the upper limit voltage respectively through different upper limit voltages and output first sub-comparison signals to the A/D conversion circuit.
Preferably, the second comparing circuit includes at least two second sub comparing circuits; at least two second sub-comparison circuits respectively compare the sampling voltage with the lower limit voltage through different ones and output second sub-comparison signals to the A/D conversion circuit.
Preferably, the device of the embodiment of the utility model comprises at least one switch device; the DC-DC power supply supplies power to the switch device according to an external power supply.
Other features of embodiments of the present utility model and advantages thereof will be apparent from the following detailed description of the disclosed exemplary embodiments with reference to the drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a power supply management apparatus of a PD device according to an embodiment;
FIG. 2 is a schematic diagram of a voltage detection module according to an embodiment;
FIG. 3 is a schematic diagram of a proportional modulation circuit according to an embodiment;
fig. 4 is a schematic diagram of the structures of the first comparing circuit and the second comparing circuit according to the embodiment.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Embodiments of the utility model are illustrated in the accompanying drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, an embodiment of the present utility model discloses a PD device power management apparatus. The apparatus is shown in fig. 1 as including a DC-DC power supply, a voltage detection module, and a PSE control module.
A DC-DC power supply, i.e., a DC-DC converter (DC-DC converter), refers to a device that converts electric energy of one voltage value into electric energy of another voltage value in a direct current circuit. The DC-DC power supply is used for receiving direct current power input from outside and converting the direct current power supply into a power supply voltage which can be used for supplying power to the PSE control module.
The PSE control module, namely a power supply module of the non-network management type POE switch, can be embedded into the switch or independently used as a product, and supplies power to a plurality of PD devices by using the direct current power supply voltage of 48V. The PSE control module can supply power to a plurality of PD devices. When the PSE control module supplies power to a plurality of PDs simultaneously to cause overload of the DC-DC power supply, the power supply voltage output by the DC-DC power supply drops. When the power supply voltage drops, the PSE control module may shut off the overloaded PD device that caused the drop.
The voltage detection module is a device for sampling and detecting the power supply voltage output by the DC-DC power supply in real time. The voltage detection module provided by the embodiment of the utility model can detect the drop of the power supply voltage and generate a control signal according to the drop condition of the power supply voltage. The control signal drives the PSE control module to shut off the overloaded PD device.
Therefore, in the embodiment of the utility model, the DC-DC power supply provides the power supply voltage for the PSE control module according to the external power supply. The voltage detection module detects the power supply voltage of the DC-DC power supply for supplying power to the PSE control module in real time, and generates a control signal according to fluctuation of the power supply voltage, wherein the control signal at least carries a time stamp when the power supply voltage fluctuates. The PSE control module receives this control signal and parses the timestamp of the control signal. The PSE control module selects a signal time range according to the timestamp and cuts off the PD devices that are accessed within the signal time range. Meanwhile, the DC-DC power supply supplies power to the main equipment of the switch.
Then, the PSE control module cuts off the PD device connected in the signal time range according to the timestamp, which is substantially equivalent to cutting off the PD device that will cause overload of the DC-DC power, so that, on one hand, the DC-DC power is no longer operated and in an overload state, and on the other hand, normal operation of the connected PD device is maintained.
Further, fig. 2 shows that the voltage detection module includes a sampling circuit, a proportional modulation circuit, a first comparison circuit, a second comparison circuit, an a/D conversion circuit, and a processor.
The sampling circuit samples the power supply voltage output by the DC-DC power supply in a resistor voltage division mode. The proportional modulation circuit is used for sampling the modulation power supply voltage reduced according to at least one scaling ratio. The first comparison circuit compares the sampling voltage with an upper limit voltage and outputs a first comparison signal. The second comparison circuit compares the sampling voltage with the lower limit voltage and outputs a second comparison signal. The A/D conversion circuit generates a digital signal according to the first comparison signal and the second comparison signal. The processor generates a control signal according to the digital signal and the input time of the digital signal.
Fig. 3 shows that the proportional modulation circuit includes a proportional modulation amplifier, a resistor R1, a resistor R2, a resistor R3, and a resistor R4. One input end of the proportional modulation amplifier is grounded through a resistor R1, the other input end of the proportional modulation amplifier is respectively connected to the sampling circuit through a resistor R2 and grounded through a resistor R3, and the output end of the proportional modulation amplifier is grounded through a resistor R4 and a resistor R1 and respectively connected to the first comparison circuit and the second comparison circuit.
Preferably, the resistance R4 is an adjustable resistor. The scaling of the sampled voltage can be modulated by the modulation resistor R4.
Further, fig. 4 shows that the first comparing circuit includes two first sub comparing circuits. The two first sub-comparison circuits respectively compare the sampling voltage with different upper limit voltages and output first sub-comparison signals to the A/D conversion circuit. The second comparison circuit comprises two second sub-comparison circuits. The two second sub-comparison circuits respectively compare the sampling voltage with the sampling voltage through different lower limit voltages and output second sub-comparison signals to the A/D conversion circuit. The multiple different upper and lower voltages may refine the ripple detection of the supply voltage to avoid false triggering of supply voltage ripple due to non-overload of the DC-DC power supply.
The foregoing is only illustrative of the present utility model and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., within the spirit and principles of the present utility model.
Claims (10)
1. A PD equipment power supply management device is characterized in that,
the device comprises a DC-DC power supply, a voltage detection module and a PSE control module;
the DC-DC power supply supplies power to the PSE control module according to an external power supply;
the voltage detection module detects a power supply voltage of the DC-DC power supply for supplying power to the PSE control module, and generates a control signal according to fluctuation of the power supply voltage;
and the PSE control power supply sequentially powers up at least two PD devices according to the DC-DC power supply, and the PSE control module cuts off at least one powered-up PD device according to the control signal.
2. The PD apparatus power management apparatus as set forth in claim 1, wherein,
the PSE control module cuts off at least one PD device causing the power supply voltage fluctuation according to the control signal.
3. The PD apparatus power management apparatus as set forth in claim 2, wherein,
the PSE control module cuts off at least one PD device occurring in a signal time range of the control signal according to the control signal.
4. The PD apparatus power management apparatus as set forth in claim 3, wherein,
the control signal is at least covered with a time stamp of the fluctuation of the power supply voltage;
the PSE control module shuts down at least one of the PD devices within a signal time range of the timestamp.
5. The PD apparatus power management apparatus as set forth in claim 1, wherein,
the voltage detection module generates the control signal when comparing the supply voltage to be greater than at least one upper limit voltage or generates the control signal when comparing the supply voltage to be less than at least one lower limit voltage.
6. The PD apparatus power management apparatus as set forth in claim 5, wherein,
the voltage detection module comprises a sampling circuit, a proportional modulation circuit, a first comparison circuit, a second comparison circuit, an A/D conversion circuit and a processor;
the sampling circuit acquires the power supply voltage output by the DC-DC power supply;
the proportion modulation circuit modulates the power supply voltage into a sampling voltage according to at least one scaling ratio;
the first comparison circuit compares the sampling voltage with at least one upper limit voltage and outputs a first comparison signal;
the second comparison circuit compares the sampling voltage with at least one lower limit voltage and outputs a second comparison signal;
the A/D conversion circuit generates a digital signal according to the first comparison signal and the second comparison signal;
the processor generates the control signal according to the digital signal and the input time of the digital signal.
7. The PD apparatus power management apparatus as set forth in claim 6, wherein,
the proportional modulation circuit comprises a proportional modulation amplifier, a resistor R1, a resistor R2, a resistor R3 and a resistor R4;
the proportional modulation amplifier
An input terminal is grounded through a resistor R1,
the other input terminal is respectively connected to the sampling circuit through a resistor R2 and grounded through a resistor R3,
the output end is grounded through a resistor R4 and a resistor R1 and is respectively connected to the first comparison circuit and the second comparison circuit.
8. The PD apparatus power management apparatus as set forth in claim 7, wherein,
the first comparison circuit comprises at least two first sub-comparison circuits;
at least two first sub-comparison circuits compare the sampling voltage with the upper limit voltage respectively through different upper limit voltages and output first sub-comparison signals to the A/D conversion circuit.
9. The PD apparatus power management apparatus as set forth in claim 7, wherein,
the second comparison circuit comprises at least two second sub-comparison circuits;
at least two second sub-comparison circuits respectively compare the sampling voltage with the lower limit voltage through different ones and output second sub-comparison signals to the A/D conversion circuit.
10. The PD apparatus power management apparatus as set forth in claim 1, wherein,
the apparatus includes at least one switch device;
the DC-DC power supply supplies power to the switch device according to an external power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223611735.7U CN219918717U (en) | 2022-12-31 | 2022-12-31 | PD equipment power supply management device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223611735.7U CN219918717U (en) | 2022-12-31 | 2022-12-31 | PD equipment power supply management device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219918717U true CN219918717U (en) | 2023-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223611735.7U Active CN219918717U (en) | 2022-12-31 | 2022-12-31 | PD equipment power supply management device |
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| Country | Link |
|---|---|
| CN (1) | CN219918717U (en) |
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- 2022-12-31 CN CN202223611735.7U patent/CN219918717U/en active Active
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