CN104991125A - Ethernet power equipment power supply detection circuit - Google Patents
Ethernet power equipment power supply detection circuit Download PDFInfo
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- CN104991125A CN104991125A CN201510327748.7A CN201510327748A CN104991125A CN 104991125 A CN104991125 A CN 104991125A CN 201510327748 A CN201510327748 A CN 201510327748A CN 104991125 A CN104991125 A CN 104991125A
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Abstract
The invention provides an Ethernet power equipment power supply detection circuit. The circuit comprises a bias voltage stabilizing circuit, a comparator circuit and a detection identification circuit. The bias voltage stabilizing circuit outputs a bias voltage to the comparator circuit and outputs a 5V preliminary stabilization voltage to a related power module for usage. The comparator circuit outputs a detection enabling signal so as to control a detection process of the detection identification circuit. In a design of the comparator circuit, a traditional scheme that a voltage reference source is compared to an input voltage is not adopted and a scheme of current comparison is used so that a circuit structure is simplified and detection efficiency is increased. Because of the bias voltage output by the bias voltage stabilizing circuit to the comparator circuit, a voltage difference between a current mirror and a current source in the comparator circuit is reduced. A problem that the currents between the two are not matched is solved. Precision of a threshold voltage is effectively increased and then accuracy of the detection circuit is improved.
Description
Technical field
The present invention relates to POE system, in particular, a kind of Ethernet consumer is powered measurement circuit design.
Background technology
POE system adopts data cable to power to the equipment in Ethernet usually, and how detecting the equipment accessed in recognition system is need the equipment of powering to be the important step that Ethernet system is normally run.It detects the resistance that the ultimate principle identified is the featured resistance judging consumer interface in Ethernet, and the design of testing circuit should meet IEEE802.3af standard.Traditional testing circuit can realize more accurate detection, but have employed very complicated circuit structure when comparing input voltage, adds volume and the cost of circuit.And because conventional detection circuitry power-on time is longer, extend the time of whole detection identification, the possibility detecting recognition failures is increased.Therefore, be necessary that the more simple Ethernet consumer efficiently of design is for power detection circuit.
Summary of the invention
Technical matters to be solved by this invention there is provided a kind of Ethernet consumer for power detection circuit.
Technical scheme of the present invention is as follows: Ethernet consumer is for power detection circuit, and it comprises biased mu balanced circuit, comparator circuit and detection identification circuit.Wherein consumer input voltage port is powered respectively to biased mu balanced circuit, comparator circuit and detection identification circuit.Biased mu balanced circuit output offset voltage to comparator circuit, and exports 5V precondition voltage to relevant electricity consumption module use.When consumer input voltage is lower than 10V, comparator circuit exports high level sense enable signal to detecting identification circuit, checks that identification circuit starts the resistance detecting featured resistance.When consumer input voltage is higher than 10V, comparator circuit output low level signal at stop detects identification circuit, detects and terminates.Comparator circuit, while output detections enable signal, goes back output detections status signal.When detected state signal is high level, show that testing circuit detects.When detected state signal is low level, show that the detection of testing circuit terminates.According to IEEE802.3af standard, the resistance of consumer featured resistance is set as 25.1K Ω.Power over Ethernet device detects the resistance of featured resistance by detecting identification circuit, if judge, Ethernet access equipment is consumer, then power over Ethernet device starts to power to Ethernet consumer.
Ethernet consumer is in power detection circuit, the biased main output offset voltage of mu balanced circuit and precondition voltage, it comprises consumer input voltage port, precondition voltage output end mouth, bias voltage output mouth, No. 1 resistance, 1 to No. 3 metal-oxide-semiconductor and No. 1 diode.Wherein consumer input voltage port connects the upper end of No. 1 resistance, and connects the drain electrode of No. 3 metal-oxide-semiconductors.The drain electrode of No. 1 metal-oxide-semiconductor connects the lower end of No. 1 resistance, and connects the grid of No. 1 metal-oxide-semiconductor.The source electrode of No. 1 metal-oxide-semiconductor connects the drain electrode of No. 2 metal-oxide-semiconductors, and connects the grid of No. 3 metal-oxide-semiconductors.The grid of No. 2 metal-oxide-semiconductors connects the drain electrode of No. 2 metal-oxide-semiconductors, and the source electrode of No. 2 metal-oxide-semiconductors connects the negative electrode of No. 1 diode.The source electrode of No. 3 metal-oxide-semiconductors connects precondition voltage output end mouth, the plus earth of No. 1 diode.
Ethernet consumer is in power detection circuit, and comparator circuit compares judgement to consumer input voltage, and output detections enable signal and detected state signal.In the design of comparator circuit, do not adopt the mode that traditional voltage-reference compares with input voltage, but the mode adopting electric current to compare, simplify circuit, improve efficiency.Comparator circuit comprises consumer input voltage port, bias voltage input mouth, sense enable signal output port, detected state signal output port, 2 to No. 6 resistance, 1 to No. 4 triode, 4 to No. 6 metal-oxide-semiconductors, 1 to No. 3 phase inverter.Wherein consumer input voltage port connects the upper end of No. 2 resistance, and connects the emitter of No. 1 triode.The base stage of No. 1 triode connects the base stage of No. 2 triodes, and the collector of No. 1 triode connects the lower end of No. 2 resistance.The emitter of No. 2 triodes connects the emitter of No. 1 triode, and the collector of No. 2 triodes connects the drain electrode of No. 4 metal-oxide-semiconductors.The grid of No. 4 metal-oxide-semiconductors connects bias voltage input mouth, and the source electrode of No. 4 metal-oxide-semiconductors connects the collector of No. 4 triodes.The upper end of No. 4 resistance connects the collector of No. 1 triode, and the lower end of No. 4 resistance connects the upper end of No. 5 resistance.The drain electrode of No. 5 metal-oxide-semiconductors connects the upper end of No. 5 resistance, and the source electrode of No. 5 metal-oxide-semiconductors connects the lower end of No. 5 resistance.The collector of No. 3 triodes connects the lower end of No. 5 resistance, and connects the base stage of No. 3 triodes.The grounded emitter of No. 3 triodes.The base stage of No. 4 triodes connects the base stage of No. 3 triodes, and the emitter of No. 4 triodes connects the upper end of No. 6 resistance, the lower end ground connection of No. 6 resistance.The upper end of No. 3 resistance connects consumer input voltage port, and the lower end of No. 3 resistance connects the drain electrode of No. 6 metal-oxide-semiconductors.The grid of No. 6 metal-oxide-semiconductors connects the collector of No. 4 triodes, the source ground of No. 6 metal-oxide-semiconductors.The input end of No. 1 phase inverter connects the lower end of No. 3 resistance, and the output terminal of No. 1 phase inverter connects the input end of No. 2 phase inverters, and the output terminal of No. 2 phase inverters connects detected state signal output part.No. 3 inverter input connect the lower end of No. 3 resistance, and the output terminal of No. 3 phase inverters connects the grid of No. 5 metal-oxide-semiconductors.Sense enable signal output terminal connects the drain electrode of No. 6 metal-oxide-semiconductors.
Ethernet consumer is in power detection circuit, detect identification circuit under the condition receiving high level sense enable signal, resistance detection is carried out to featured resistance i.e. No. 7 resistance, detect identification circuit and only accept the different input voltage of twice magnitude of voltage, featured resistance resistance is drawn by the voltage on featured resistance and the Current calculation that flows through featured resistance by power-supply unit.If the resistance calculating gained featured resistance is 25.1K Ω, then show that institute's access device is consumer, power-supply unit starts to its power supply.Detect identification circuit and comprise consumer input voltage port, sense enable signal output port, No. 7 resistance and No. 7 metal-oxide-semiconductors.Wherein consumer input voltage port connects the upper end of No. 7 resistance, and the lower end of No. 7 resistance connects the drain electrode of No. 7 metal-oxide-semiconductors.Sense enable signal output port connects the grid of No. 7 metal-oxide-semiconductors, the source ground of No. 7 metal-oxide-semiconductors.
The present invention is applicable to the detection identification to access consumer of power-supply unit in POE system.Based on IEEE802.3af standard, it is simpler that the present invention devises structure, and the Ethernet consumer that detection efficiency is higher supplies power detection circuit.Wherein the design of comparator circuit does not adopt the mode that traditional voltage-reference compares with input voltage, but the mode adopting electric current to compare, simplify circuit, improve detection efficiency.The bias voltage that biased mu balanced circuit outputs to comparator circuit reduces the voltage difference in comparator circuit between current mirror and current source, solve electric current mismatch problem, effectively improve the precision of threshold voltage settings, and then improve the accuracy of testing circuit detection.
Accompanying drawing explanation
Fig. 1 is circuit structure block scheme of the present invention;
Fig. 2 is biased voltage regulator circuit structure figure of the present invention;
Fig. 3 is comparator circuit structural drawing of the present invention;
Fig. 4 is detection identification circuit structural drawing of the present invention;
Fig. 5 is integrated circuit structural drawing of the present invention.
Embodiment
For the ease of understanding the present invention, below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.Give preferred embodiment of the present invention in this instructions and accompanying drawing thereof, but the present invention can realize in many different forms, is not limited to the embodiment described by this instructions.On the contrary, provide the object of these embodiments be make the understanding of disclosure of the present invention more comprehensively thorough.
It should be noted that, when a certain element is fixed on another element, comprise and this element is directly fixed on this another element, or this element is fixed on this another element by least one other element placed in the middle.When an element connects another element, comprise and this element is directly connected to this another element, or this element is connected to this another element by least one other element placed in the middle.
As shown in Figure 1, Ethernet consumer is for power detection circuit, and it comprises biased mu balanced circuit, comparator circuit and detection identification circuit.Wherein consumer input voltage port output voltage Ui gives biased mu balanced circuit, comparator circuit and detection identification circuit respectively.Biased mu balanced circuit output offset voltage U e to comparator circuit, and exports 5V precondition voltage U n to relevant electricity consumption module use.When consumer input voltage Ui is lower than 10V, comparator circuit exports high level sense enable signal Ds to detecting identification circuit, checks that identification circuit starts the resistance detecting featured resistance.When consumer input voltage Ui is higher than 10V, comparator circuit output signal Ds is low level, detects identification circuit and is closed, detect and terminate.Comparator circuit, while output detections enable signal, goes back output detections status signal Lz.When detected state signal Lz is high level, show that testing circuit detects.When detected state signal Lz is low level, show that the detection of testing circuit terminates.According to IEEE802.3af standard, the resistance of consumer featured resistance is set as 25.1K Ω.Power over Ethernet device detects the resistance of featured resistance by detecting identification circuit, if judge, Ethernet access equipment is consumer, then power over Ethernet device starts to power to Ethernet consumer.
As shown in Figure 2, biased mu balanced circuit main output offset voltage U e and precondition voltage U n, it comprises consumer input voltage port Ui, precondition voltage output end mouth Un, bias voltage output mouth Ue, resistance R1, metal-oxide-semiconductor MD1 to MD3, diode D1.The wherein upper end of consumer input voltage port Ui contact resistance R1, and connect the drain electrode of metal-oxide-semiconductor MD3.The lower end of the drain electrode contact resistance R1 of metal-oxide-semiconductor MD1, and connect the grid of metal-oxide-semiconductor MD1.The source electrode of metal-oxide-semiconductor MD1 connects the drain electrode of metal-oxide-semiconductor MD2, and connects the grid of metal-oxide-semiconductor MD3.The grid of metal-oxide-semiconductor MD2 connects the drain electrode of metal-oxide-semiconductor MD2, and the source electrode of metal-oxide-semiconductor MD2 connects the negative electrode of diode D1.The source electrode of metal-oxide-semiconductor MD3 connects precondition voltage output end mouth Un, the plus earth of diode D1.
As shown in Figure 3, comparator circuit compares judgement to consumer input voltage Ui, and output detections enable signal Ds and detected state signal Lz.In the design of comparator circuit, do not adopt the mode that traditional voltage-reference compares with input voltage, but the mode adopting electric current to compare, simplify circuit, improve efficiency.Comparator circuit comprises consumer input voltage port Ui, bias voltage input mouth Ue, sense enable signal output port Ds, detected state signal output port Lz, resistance R2 to R6, triode QS1 to QS4, metal-oxide-semiconductor MD4 to MD6, phase inverter T1 to T3.The wherein upper end of consumer input voltage port Ui contact resistance R2, and the emitter of connecting triode QS1.The base stage of the base stage connecting triode QS2 of triode QS1, the lower end of the collector contact resistance R2 of triode QS1.The emitter of the emitter connecting triode QS1 of triode QS2, the collector of triode QS2 connects the drain electrode of metal-oxide-semiconductor MD4.The grid of metal-oxide-semiconductor MD4 connects bias voltage input mouth Ui, the collector of the source electrode connecting triode QS4 of metal-oxide-semiconductor MD4.The collector of the upper end connecting triode QS1 of resistance R4, the upper end of the lower end contact resistance R5 of resistance R4.The upper end of the drain electrode contact resistance R5 of metal-oxide-semiconductor MD5, the lower end of the source electrode contact resistance R5 of metal-oxide-semiconductor MD5.The lower end of the collector contact resistance R5 of triode QS3, and the base stage of connecting triode QS3.The grounded emitter of triode QS3.The base stage of the base stage connecting triode QS3 of triode QS4, the upper end of the emitter contact resistance R6 of triode QS4, the lower end ground connection of resistance R6.The upper end of resistance R3 connects consumer input voltage port Ui, and the lower end of resistance R3 connects the drain electrode of metal-oxide-semiconductor MD6.The collector of the grid connecting triode QS4 of metal-oxide-semiconductor MD6, the source ground of metal-oxide-semiconductor MD6.The lower end of the input end contact resistance R3 of phase inverter T1, the output terminal of phase inverter T1 connects the input end of phase inverter T2, and the output terminal of phase inverter T2 connects detected state signal output part Lz.The lower end of phase inverter T3 input end contact resistance R3, the output terminal of phase inverter T3 connects the grid of metal-oxide-semiconductor MD5.Sense enable signal output terminal Ds connects the drain electrode of metal-oxide-semiconductor MD6.
As shown in Figure 4, detect identification circuit under the condition receiving high level sense enable signal, resistance detection is carried out to featured resistance and resistance R7, detect identification circuit and only receive the different input voltage of twice magnitude of voltage, featured resistance R7 resistance is drawn by the voltage on featured resistance R7 and the Current calculation that flows through featured resistance R7 by power-supply unit.If the resistance calculating gained featured resistance R7 is 25.1K Ω, then show that institute's access device is consumer, power-supply unit starts to its power supply.Detect identification circuit and comprise consumer input voltage port Ui, sense enable signal output port Ds, resistance R7 and metal-oxide-semiconductor MD7.The wherein upper end of consumer input voltage port Ui contact resistance R7, the lower end of resistance R7 connects the drain electrode of metal-oxide-semiconductor MD7.Sense enable signal output port Ds connects the grid of metal-oxide-semiconductor MD7, the source ground of metal-oxide-semiconductor MD7.
As shown in Figure 5, Ethernet consumer comprises biased mu balanced circuit, comparator circuit and detection identification circuit for power detection circuit.Wherein biased mu balanced circuit is connected by bias voltage port Ue with comparator circuit, and comparator circuit is connected by detecting enable port Ds with detection identification circuit.Biased mu balanced circuit also exports 5V precondition voltage U n while output offset voltage U e, and comparator circuit goes back output detections status signal Lz while output detections enable signal Ds.Consumer input voltage port Ui connects above-mentioned three circuit respectively.When consumer input voltage Ui is lower than 10V, comparator circuit exports high level sense enable signal Ds to detecting identification circuit, checks that identification circuit starts the resistance detecting featured resistance.When consumer input voltage Ui is higher than 10V, comparator circuit output signal Ds is low level, detects identification circuit and is closed, detect and terminate.According to IEEE802.3af standard, the resistance of consumer featured resistance is set as 25.1K Ω.Detect identification circuit under the condition receiving high level sense enable signal Ds, resistance detection is carried out to featured resistance and resistance R7, detect identification circuit and only receive the different input voltage of twice magnitude of voltage, featured resistance R7 resistance is drawn by the voltage on featured resistance R7 and the Current calculation that flows through featured resistance R7 by power-supply unit.If the resistance calculating gained featured resistance R7 is 25.1K Ω, then show that Ethernet institute access device is consumer, power-supply unit starts to its power supply.
Further, embodiments of the invention also comprise, each technical characteristic of the various embodiments described above, the high stability in-line power circuit being applicable to Switching Power Supply be mutually combined to form.
It should be noted that, above-mentioned each technical characteristic continues combination mutually, is formed not in above-named various embodiment, is all considered as the scope that instructions of the present invention is recorded; Further, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (7)
1. Ethernet consumer is for power detection circuit, it is characterized in that, it comprises biased mu balanced circuit, comparator circuit and detection identification circuit, consumer input voltage port is powered to biased mu balanced circuit, comparator circuit and detection identification circuit respectively, biased mu balanced circuit output offset voltage is to comparator circuit, and exporting 5V precondition voltage, comparator circuit output detections enable signal is given and is detected identification circuit, and output detections status signal.
2. Ethernet consumer supplies power detection circuit according to claim 1, it is characterized in that, biased mu balanced circuit comprises consumer input voltage port, precondition voltage output end mouth, bias voltage output mouth, No. 1 resistance, 1 to No. 3 metal-oxide-semiconductor and No. 1 diode.
3. Ethernet consumer is for power detection circuit according to claim 2, and it is characterized in that, consumer input voltage port connects the upper end of No. 1 resistance, and connects the drain electrode of No. 3 metal-oxide-semiconductors;
The drain electrode of No. 1 metal-oxide-semiconductor connects the lower end of No. 1 resistance, and connects the grid of No. 1 metal-oxide-semiconductor;
The source electrode of No. 1 metal-oxide-semiconductor connects the drain electrode of No. 2 metal-oxide-semiconductors, and connects the grid of No. 3 metal-oxide-semiconductors;
The grid of No. 2 metal-oxide-semiconductors connects the drain electrode of No. 2 metal-oxide-semiconductors, and the source electrode of No. 2 metal-oxide-semiconductors connects the negative electrode of No. 1 diode;
The source electrode of No. 3 metal-oxide-semiconductors connects precondition voltage output end mouth, the plus earth of No. 1 diode.
4. Ethernet consumer supplies power detection circuit according to claim 1, it is characterized in that, comparator circuit comprises consumer input voltage port, bias voltage input mouth, sense enable signal output port, detected state signal output port, 2 to No. 6 resistance, 1 to No. 4 triode, 4 to No. 6 metal-oxide-semiconductors, 1 to No. 3 phase inverter.
5. Ethernet consumer is for power detection circuit according to claim 4, and it is characterized in that, consumer input voltage port connects the upper end of No. 2 resistance, and connects the emitter of No. 1 triode;
The base stage of No. 1 triode connects the base stage of No. 2 triodes, and the collector of No. 1 triode connects the lower end of No. 2 resistance;
The emitter of No. 2 triodes connects the emitter of No. 1 triode, and the collector of No. 2 triodes connects the drain electrode of No. 4 metal-oxide-semiconductors;
The grid of No. 4 metal-oxide-semiconductors connects bias voltage input mouth, and the source electrode of No. 4 metal-oxide-semiconductors connects the collector of No. 4 triodes;
The upper end of No. 4 resistance connects the collector of No. 1 triode, and the lower end of No. 4 resistance connects the upper end of No. 5 resistance;
The drain electrode of No. 5 metal-oxide-semiconductors connects the upper end of No. 5 resistance, and the source electrode of No. 5 metal-oxide-semiconductors connects the lower end of No. 5 resistance;
The collector of No. 3 triodes connects the lower end of No. 5 resistance, and connects the base stage of No. 3 triodes, the grounded emitter of No. 3 triodes;
The base stage of No. 4 triodes connects the base stage of No. 3 triodes, and the emitter of No. 4 triodes connects the upper end of No. 6 resistance, the lower end ground connection of No. 6 resistance;
The upper end of No. 3 resistance connects consumer input voltage port, and the lower end of No. 3 resistance connects the drain electrode of No. 6 metal-oxide-semiconductors;
The grid of No. 6 metal-oxide-semiconductors connects the collector of No. 4 triodes, the source ground of No. 6 metal-oxide-semiconductors;
The input end of No. 1 phase inverter connects the lower end of No. 3 resistance, and the output terminal of No. 1 phase inverter connects the input end of No. 2 phase inverters, and the output terminal of No. 2 phase inverters connects detected state signal output part;
No. 3 inverter input connect the lower end of No. 3 resistance, and the output terminal of No. 3 phase inverters connects the grid of No. 5 metal-oxide-semiconductors;
Sense enable signal output terminal connects the drain electrode of No. 6 metal-oxide-semiconductors.
6. Ethernet consumer, for power detection circuit, is characterized in that according to claim 1, detects identification circuit and comprises consumer input voltage port, sense enable signal output port, No. 7 resistance and No. 7 metal-oxide-semiconductors.
7. Ethernet consumer is for power detection circuit according to claim 6, and it is characterized in that, consumer input voltage port connects the upper end of No. 7 resistance, and the lower end of No. 7 resistance connects the drain electrode of No. 7 metal-oxide-semiconductors,
Sense enable signal output port connects the grid of No. 7 metal-oxide-semiconductors, the source ground of No. 7 metal-oxide-semiconductors.
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| CN201510327748.7A CN104991125A (en) | 2015-06-15 | 2015-06-15 | Ethernet power equipment power supply detection circuit |
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| CN105548680A (en) * | 2015-12-05 | 2016-05-04 | 许昌学院 | Ethernet electric equipment power level detection circuit |
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Application publication date: 20151021 |