CN104901267A - Ethernet electric equipment low-loss overcurrent protection circuit - Google Patents
Ethernet electric equipment low-loss overcurrent protection circuit Download PDFInfo
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Abstract
The invention provides an Ethernet electric equipment overcurrent protection circuit, including four parts, i.e., a threshold circuit, a comparison and amplification circuit, a power supply circuit and a time delay circuit, and aims to prevent damage to equipment from being caused by too large current when Ethernet electric equipment is powered-on or in normal operation. Taking reduction of circuit loss into account, a relatively small protective threshold voltage is selected. In order to reduce error triggering in a threshold voltage switching process, a related time delay circuit is arranged. In order to effectively improve precision of circuit control, the comparison and amplification circuit adopts transistors with relatively small technological deviations as a forward input port and a reverse input port, and a related resistor is introduced to the threshold circuit to reduce errors of a voltage sampling signal and a threshold voltage signal. Therefore, the Ethernet electric equipment low-loss overcurrent protection circuit has the advantages of low loss and high precision while effectively protecting electrification and normal operation of Ethernet equipment.
Description
Technical field
The present invention relates to the design of ethernet device electricity consumption interface circuit, in particular, a kind of design of equipment electrical interface current foldback circuit.
Background technology
When ethernet device starts to work on power, there will be overshoot current and make circuit and device failure thereof.Further, in the process that equipment normally works, due to change or the short circuit of load, there will be larger circuit damage equipment equally.Therefore, be necessary that the current foldback circuit designing Ethernet power consumption equipment carrys out proterctive equipment.Due in ethernet device power up, electric current raises rapidly within a short period of time, and the overcurrent protection threshold value therefore set should be relatively little.And when equipment normally works, should with IEEE802.3af standard for foundation, set a relatively large overcurrent protection threshold value, to ensure the normal work of equipment.Visible ethernet device current foldback circuit should have dual threshold, and can switch according to the operating state of equipment.In the design of equipment current foldback circuit, designs simplification and the loss problem of circuit should be considered equally, have more practicality to make circuit.
Summary of the invention
Technical problem to be solved by this invention there is provided a kind of Ethernet power consumption equipment current foldback circuit.
Technical scheme of the present invention is as follows: Ethernet power consumption equipment current foldback circuit comprises four parts, and it is respectively threshold circuit, compares amplifying circuit, power supply circuits and delay circuit.In device power process, voltage sampling signal passing threshold circuit is input to the inverting input comparing amplifying circuit by power supply circuits, and power-up state threshold voltage signal is input to the positive input comparing amplifying circuit by threshold circuit simultaneously.Relatively the signal of amplifying circuit to positive input and reverse input end compares, and exports control signal, to limit the overshoot current of power supply circuits.When equipment is changed to normal operating conditions by power-up state, the voltage sampling signal that power supply circuits export can be pulled low to close to zero potential, and comparing amplifying circuit defeated threshold value can go out switching signal, is input to threshold circuit through delay circuit.When threshold circuit receives threshold value switching signal, circuit by according to Sequential logic output operating state threshold voltage signal to the positive input comparing amplifying circuit.Amplify comparison circuit and export control signal according to operating state threshold voltage signal and voltage sampling signal, and overcurrent protection is carried out to equipment.
In Ethernet power consumption equipment current foldback circuit, threshold circuit comprises threshold value switching signal input, voltage sampling signal input, voltage sampling signal output, threshold voltage signal output, 1 to No. 6 metal-oxide-semiconductor, 1 to No. 4 resistance, reference current source, No. 1 inverter.Threshold circuit can produce the threshold voltage of 11.5mV and 37mV respectively, when threshold value switching signal is low level, circuit exports 11.5mV power-up state threshold voltage signal, and when threshold value switching signal is high level, circuit exports 37mV operating state threshold voltage signal.Wherein threshold value switching signal input connects the grid of No. 2 metal-oxide-semiconductors by No. 1 inverter, and directly connects the grid of No. 1 metal-oxide-semiconductor.Voltage sampling signal input connects the upper end of No. 1 resistance and No. 2 resistance, and voltage sampling signal output connects the drain electrode of No. 1 metal-oxide-semiconductor and No. 2 metal-oxide-semiconductors.Threshold voltage signal output connects the drain electrode of No. 3 metal-oxide-semiconductors and No. 4 metal-oxide-semiconductors.The source electrode of No. 1 metal-oxide-semiconductor connects the lower end of No. 2 resistance, and No. 2 metal-oxide-semiconductor source electrodes connect the lower end of No. 1 resistance.The grid of No. 3 metal-oxide-semiconductors connects the grid of No. 6 metal-oxide-semiconductors, and the source electrode of No. 3 metal-oxide-semiconductors connects the upper end of No. 4 resistance.The grid of No. 4 metal-oxide-semiconductors connects the grid of No. 5 metal-oxide-semiconductors, and the source electrode of No. 4 metal-oxide-semiconductors connects the upper end of No. 3 resistance.The grid of No. 5 metal-oxide-semiconductors connects the grid of No. 1 metal-oxide-semiconductor, and the drain electrode of No. 5 metal-oxide-semiconductors connects the lower end of reference current source.The grid of No. 6 metal-oxide-semiconductors connects the grid of No. 2 metal-oxide-semiconductors, and the drain electrode of No. 6 metal-oxide-semiconductors connects the drain electrode of No. 5 metal-oxide-semiconductors.In threshold circuit, the employing of 1 to No. 4 resistance can eliminate the error of two-way output signal relatively time, and the setting of less threshold voltage then effectively can reduce the loss of circuit.
In Ethernet power consumption equipment current foldback circuit, compare amplifying circuit and comprise positive input mouth, anti-phase input port, control signal output port, threshold value switching signal output port, 7 to No. 39 metal-oxide-semiconductors, 1 to No. 4 transistor, reference current source, 2 to No. 3 inverters.In relatively amplifying circuit, positive input receive threshold voltage signal, inverting input receiver voltage sampled signal.Control signal output connects No. 40 metal-oxide-semiconductors of power supply circuits, limits the overshoot current in power supply circuits.The change of threshold value switching signal output end signal is mainly according to voltage sampling signal, and at the end of power-up state, voltage sampling signal is close to zero potential, and threshold value switching signal is high level by low transition.Relatively in amplifying circuit, positive input mouth connects the base stage of No. 3 transistors, and anti-phase input port connects the base stage of No. 4 transistors.Control signal output port connects the drain electrode of No. 33 metal-oxide-semiconductors, and threshold value switching signal output port connects the output of No. 2 inverters.The base stage of No. 1 transistor connects the base stage of No. 2 transistors, and the collector electrode of No. 1 transistor connects the drain electrode of No. 12 metal-oxide-semiconductors.The base stage of No. 2 transistors connects the source electrode of No. 13 metal-oxide-semiconductors, and the collector electrode of No. 2 transistors connects the drain electrode of No. 11 metal-oxide-semiconductors.The emitter of No. 3 transistors connects the emitter of No. 2 transistors, the grounded collector of No. 3 transistors.The emitter of No. 4 transistors connects the emitter of No. 1 transistor, the grounded collector of No. 4 transistors.The input of No. 2 inverters connects the source electrode of No. 25 metal-oxide-semiconductors, and the output of No. 2 inverters connects the input of No. 3 inverters.The drain electrode of No. 31 metal-oxide-semiconductors connects reference current source, and the source electrode of No. 31 metal-oxide-semiconductors connects the drain electrode of No. 32 metal-oxide-semiconductors.Compare the employing of 1 to No. 4 transistor in amplifying circuit, be conducive to reducing the deviation exporting control signal, make Current limited Control effect more accurate.
In Ethernet power consumption equipment current foldback circuit, power supply circuits comprise voltage input end mouth, control signal input port, voltage sampling signal output port, switch power supply system, No. 1 electric capacity, No. 40 metal-oxide-semiconductors, No. 5 resistance.In power supply circuits, No. 40 metal-oxide-semiconductors, No. 5 resistance with compare amplifying circuit and jointly form overshoot current limiting circuit, by the current limit in power supply circuits within safe range.In power up, because No. 1 electric capacity is charged, the current potential of voltage sampling signal output is constantly dragged down, when voltage sampling signal output current potential close to zero time, power up terminates, and power supply circuits start the power supply that normally works.In power supply circuits, voltage input end connects the left end of No. 1 electric capacity, and the right-hand member of No. 1 electric capacity connects the drain electrode of No. 40 metal-oxide-semiconductors.The grid connection control signal input port of No. 40 metal-oxide-semiconductors, the source electrode of No. 40 metal-oxide-semiconductors connects the upper end of No. 5 resistance.The upper end of No. 5 resistance connects voltage sampling signal output port, the lower end ground connection of No. 5 resistance.
In Ethernet power consumption equipment current foldback circuit, delay circuit comprises threshold value switching signal input port, time delayed signal output port, 41 to No. 55 metal-oxide-semiconductors, 4 to No. 5 inverters, reference current source, No. 2 electric capacity.In delay circuit, amplify the input of threshold value switching signal as delay circuit of comparison circuit output, and the threshold value switching signal after time delay is imported in threshold circuit.The threshold value switching signal erroneous trigger of employing mainly in order to avoid causing due to interference of delay circuit.In delay circuit, threshold value switching signal input port connects the grid of 46 and No. 49 metal-oxide-semiconductors, and time delayed signal output port connects the output of No. 5 inverters.The drain electrode of No. 43 metal-oxide-semiconductors connects reference current source, the source ground of No. 43 metal-oxide-semiconductors.The upper end of No. 2 electric capacity connects the grid of 53 and No. 54 metal-oxide-semiconductors, the lower end ground connection of No. 2 electric capacity.The grid of No. 52 metal-oxide-semiconductors connects the grid of No. 55 metal-oxide-semiconductors, and the drain electrode of No. 52 metal-oxide-semiconductors connects the source electrode of No. 53 metal-oxide-semiconductors.The grid of No. 53 metal-oxide-semiconductors connects the drain electrode of No. 46 metal-oxide-semiconductors, and the drain electrode of No. 53 metal-oxide-semiconductors connects the drain electrode of No. 54 metal-oxide-semiconductors.The grid of No. 54 metal-oxide-semiconductors connects the drain electrode of No. 47 metal-oxide-semiconductors, and the drain electrode of No. 54 metal-oxide-semiconductors connects the input of No. 4 inverters.The grid of No. 55 metal-oxide-semiconductors connects the source electrode of No. 49 metal-oxide-semiconductors, the source ground of No. 55 metal-oxide-semiconductors.
The present invention is mainly used in overcurrent protection when ethernet device powers on and normally works.According to IEEE802.3af standard, the present invention sets two protection threshold voltages, and is respectively used to the overcurrent protection of device power state and operating state.For the consideration reducing circuit loss, the present invention have chosen relatively little protection threshold voltage.And in order to reduce the erroneous trigger of threshold voltage handoff procedure, the present invention is provided with the delay circuit of 450us.In order to effectively improve the precision of control circui, relatively amplifying circuit adopt process deviation comparatively small transistor as positive input mouth and anti-phase input port, and in threshold circuit, introduce 1 to No. 4 resistance to reduce the error of voltage sampling signal and threshold voltage signal.Visible, the present invention, while available protecting ethernet device powers on and normally works, has again the advantage of low-loss and high accurancy and precision.
Accompanying drawing explanation
Fig. 1 is Circuits System block diagram of the present invention;
Fig. 2 is the circuit diagram of threshold circuit of the present invention;
Fig. 3 is the circuit diagram comparing amplifying circuit of the present invention;
Fig. 4 is the circuit diagram of power supply circuits of the present invention;
Fig. 5 is the circuit diagram of delay circuit 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 specification and accompanying drawing thereof, but the present invention can realize in many different forms, is not limited to the embodiment described by this specification.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, the present invention includes four parts, it be respectively threshold circuit, compare amplifying circuit, power supply circuits and delay circuit.In device power process, voltage sampling signal Vsmp passing threshold circuit is input to the inverting input comparing amplifying circuit by power supply circuits, and 11.5mV power-up state threshold voltage signal Vtal is input to the positive input comparing amplifying circuit by threshold circuit simultaneously.Relatively the signal of amplifying circuit to positive input and reverse input end compares, and exports control signal Vcon, to limit the overshoot current of power supply circuits.When equipment is changed to normal operating conditions by power-up state, the voltage sampling signal Vsmp that power supply circuits export can be pulled low to close to zero potential, compares amplifying circuit and can export threshold value switching signal Vins, be input to threshold circuit through delay circuit.When threshold circuit receives threshold value switching signal Vins, circuit by according to Sequential logic output 37mV operating state threshold voltage signal Vtal to the positive input comparing amplifying circuit.Threshold circuit carries out overcurrent protection according to operating state threshold voltage signal Vtal and voltage sampling signal Vsmp to equipment.
As shown in Figure 2, threshold circuit comprises threshold value switching signal input Vins, voltage sampling signal input Vsmp, voltage sampling signal output Vn, threshold voltage signal output Vtal, metal-oxide-semiconductor M1 to M6, electric R1 to R4, reference current source ib, inverter T1.Threshold circuit can produce the threshold voltage of 11.5mV and 37mV respectively, when threshold value switching signal Vins is low level, circuit exports 11.5mV power-up state threshold voltage signal Vtal, and when threshold value switching signal Vins is high level, circuit exports 37mV operating state threshold voltage signal Vtal.Wherein threshold value switching signal input Vins connects the grid of metal-oxide-semiconductor M2 by inverter T1, and directly connects the grid of metal-oxide-semiconductor M1.The upper end of voltage sampling signal input Vsmp contact resistance R1 and resistance R2, voltage sampling signal output Vn connects the drain electrode of metal-oxide-semiconductor M1 and metal-oxide-semiconductor M2.Threshold voltage signal output Vtal connects the drain electrode of metal-oxide-semiconductor M3 and metal-oxide-semiconductor M4.The lower end of the source electrode contact resistance R2 of metal-oxide-semiconductor M1, the lower end of metal-oxide-semiconductor M2 source electrode contact resistance R1.The grid of metal-oxide-semiconductor M3 connects the grid of metal-oxide-semiconductor M6, the upper end of the source electrode contact resistance R4 of metal-oxide-semiconductor M3.The grid of metal-oxide-semiconductor M4 connects the grid of metal-oxide-semiconductor M5, the upper end of the source electrode contact resistance R3 of metal-oxide-semiconductor M4.The grid of metal-oxide-semiconductor M5 connects the grid of metal-oxide-semiconductor M1, and the drain electrode of metal-oxide-semiconductor M5 connects the lower end of reference current source ib.The grid of metal-oxide-semiconductor M6 connects the grid of metal-oxide-semiconductor M2, and the drain electrode of metal-oxide-semiconductor M6 connects the drain electrode of metal-oxide-semiconductor M5.In threshold circuit, the employing of resistance R1 to R4 can eliminate the error of two-way output signal relatively time, and the setting of less threshold voltage then effectively can reduce the loss of circuit.
As shown in Figure 3, compare amplifying circuit and comprise positive input mouth Vtal, anti-phase input port Vn, control signal output port Vcon, threshold value switching signal output port Vins, metal-oxide-semiconductor M7 to M39, transistor Q1 to Q4, reference current source ia, inverter T2 to T3.In relatively amplifying circuit, positive input Vtal receive threshold voltage signal Vtal, inverting input Vn receiver voltage sampled signal Vsmp.Control signal output Vcon connects the metal-oxide-semiconductor M40 of power supply circuits, limits the overshoot current in power supply circuits.The change of threshold value switching signal output Vins signal is mainly according to voltage sampling signal Vsmp, and at the end of power-up state, voltage sampling signal Vsmp is close to zero potential, and threshold value switching signal Vins is high level by low transition.Relatively in amplifying circuit, positive input mouth Vtal connects the base stage of transistor Q3, and anti-phase input port Vn connects the base stage of transistor Q4.Control signal output port Vcon connects the drain electrode of metal-oxide-semiconductor M33, and threshold value switching signal output port Vins connects the output of inverter T2.The base stage of transistor Q1 connects the base stage of transistor Q2, and the collector electrode of transistor Q1 connects the drain electrode of metal-oxide-semiconductor M12.The base stage of transistor Q2 connects the source electrode of metal-oxide-semiconductor M13, and the collector electrode of transistor Q2 connects the drain electrode of metal-oxide-semiconductor M11.The emitter of transistor Q3 connects the emitter of transistor Q2, the grounded collector of transistor Q3.The emitter of transistor Q4 connects the emitter of transistor Q1, the grounded collector of transistor Q4.The input of inverter T2 connects the source electrode of metal-oxide-semiconductor M25, and the output of inverter T2 connects the input of inverter T3.The drain electrode of metal-oxide-semiconductor M31 connects reference current source ia, and the source electrode of metal-oxide-semiconductor M31 connects the drain electrode of metal-oxide-semiconductor M32.Compare the employing of transistor Q1 to Q4 in amplifying circuit, be conducive to reducing the deviation exporting control signal Vcon, make Current limited Control effect more accurate.
As shown in Figure 4, power supply circuits comprise voltage input end mouth Vin, control signal input port Vcon, voltage sampling signal output port Vsmp, switch power supply system, electric capacity c1, metal-oxide-semiconductor M40, resistance R5.In power supply circuits, metal-oxide-semiconductor M40, resistance R5 with compare amplifying circuit and jointly form overshoot current limiting circuit, by the current limit in power supply circuits within safe range.In power up, because electric capacity C1 is charged, the current potential of voltage sampling signal output Vsmp is constantly dragged down, when voltage sampling signal output Vsmp current potential close to zero time, power up terminates, and power supply circuits start the power supply that normally works.In power supply circuits, voltage input end connects the left end of electric capacity C1, and the right-hand member of electric capacity C1 connects the drain electrode of metal-oxide-semiconductor M40.The grid connection control signal input port Vcon of metal-oxide-semiconductor M40, the upper end of the source electrode contact resistance R5 of metal-oxide-semiconductor M40.The upper end of resistance R5 connects voltage sampling signal output port Vsmp, the lower end ground connection of resistance R5.
As shown in Figure 5, in Ethernet power consumption equipment current foldback circuit, delay circuit comprises threshold value switching signal input port Vins, time delayed signal output port Vdel, metal-oxide-semiconductor M41 to M55, inverter T4 to T5, reference current source ic, electric capacity C2.In delay circuit, amplify the input of threshold value switching signal Vins as delay circuit of comparison circuit output, and the threshold value switching signal Vins after time delay is imported in threshold circuit.The threshold value switching signal erroneous trigger of employing mainly in order to avoid causing due to interference of delay circuit.In delay circuit, threshold value switching signal input port Vins connects the grid of metal-oxide-semiconductor M46 and M49, and time delayed signal output port Vdel connects the output of inverter T5.The drain electrode of metal-oxide-semiconductor M43 connects reference current source ic, the source ground of metal-oxide-semiconductor M43.The upper end of electric capacity C2 connects the grid of metal-oxide-semiconductor M53 and M54, the lower end ground connection of electric capacity C2.The grid of metal-oxide-semiconductor M52 connects the grid of metal-oxide-semiconductor M55, and the drain electrode of metal-oxide-semiconductor M52 connects the source electrode of metal-oxide-semiconductor M53.The grid of metal-oxide-semiconductor M53 connects the drain electrode of metal-oxide-semiconductor M46, and the drain electrode of metal-oxide-semiconductor M53 connects the drain electrode of metal-oxide-semiconductor M54.The grid of metal-oxide-semiconductor M54 connects the drain electrode of metal-oxide-semiconductor M47, and the drain electrode of metal-oxide-semiconductor M54 connects the input of inverter T4.The grid of metal-oxide-semiconductor M55 connects the source electrode of metal-oxide-semiconductor M49, the source ground of metal-oxide-semiconductor M55.
Further, embodiments of the invention also comprise, each technical characteristic of the various embodiments described above, the secondary temperature compensated reference source 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 specification 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 range that all should belong to claims of the present invention.
Claims (9)
1. an Ethernet power consumption equipment current foldback circuit, is characterized in that, it comprises threshold circuit, compares amplifying circuit, power supply circuits and delay circuit.
2. a kind of Ethernet power consumption equipment current foldback circuit according to claim 1; it is characterized in that, threshold circuit comprises threshold value switching signal input, voltage sampling signal input, voltage sampling signal output, threshold voltage signal output, 1 to No. 6 metal-oxide-semiconductor, 1 to No. 4 resistance, reference current source, No. 1 inverter.
3. a kind of Ethernet power consumption equipment current foldback circuit according to claim 2, it is characterized in that, threshold value switching signal input connects the grid of No. 2 metal-oxide-semiconductors by No. 1 inverter, and directly connects the grid of No. 1 metal-oxide-semiconductor;
Voltage sampling signal input connects the upper end of No. 1 resistance and No. 2 resistance, and voltage sampling signal output connects the drain electrode of No. 1 metal-oxide-semiconductor and No. 2 metal-oxide-semiconductors;
Threshold voltage signal output connects the drain electrode of No. 3 metal-oxide-semiconductors and No. 4 metal-oxide-semiconductors;
The source electrode of No. 1 metal-oxide-semiconductor connects the lower end of No. 2 resistance, and No. 2 metal-oxide-semiconductor source electrodes connect the lower end of No. 1 resistance;
The grid of No. 3 metal-oxide-semiconductors connects the grid of No. 6 metal-oxide-semiconductors, and the source electrode of No. 3 metal-oxide-semiconductors connects the upper end of No. 4 resistance;
The grid of No. 4 metal-oxide-semiconductors connects the grid of No. 5 metal-oxide-semiconductors, and the source electrode of No. 4 metal-oxide-semiconductors connects the upper end of No. 3 resistance;
The grid of No. 5 metal-oxide-semiconductors connects the grid of No. 1 metal-oxide-semiconductor, and the drain electrode of No. 5 metal-oxide-semiconductors connects the lower end of reference current source;
The grid of No. 6 metal-oxide-semiconductors connects the grid of No. 2 metal-oxide-semiconductors, and the drain electrode of No. 6 metal-oxide-semiconductors connects the drain electrode of No. 5 metal-oxide-semiconductors.
4. a kind of Ethernet power consumption equipment current foldback circuit according to claim 1; it is characterized in that, compare amplifying circuit and comprise positive input mouth, anti-phase input port, control signal output port, threshold value switching signal output port, 7 to No. 39 metal-oxide-semiconductors, 1 to No. 4 transistor, reference current source, 2 to No. 3 inverters.
5. a kind of Ethernet power consumption equipment current foldback circuit according to claim 4, it is characterized in that, positive input mouth connects the base stage of No. 3 transistors, and anti-phase input port connects the base stage of No. 4 transistors;
Control signal output port connects the drain electrode of No. 33 metal-oxide-semiconductors, and threshold value switching signal output port connects the output of No. 2 inverters;
The base stage of No. 1 transistor connects the base stage of No. 2 transistors, and the collector electrode of No. 1 transistor connects the drain electrode of No. 12 metal-oxide-semiconductors;
The base stage of No. 2 transistors connects the source electrode of No. 13 metal-oxide-semiconductors, and the collector electrode of No. 2 transistors connects the drain electrode of No. 11 metal-oxide-semiconductors;
The emitter of No. 3 transistors connects the emitter of No. 2 transistors, the grounded collector of No. 3 transistors;
the emitter of No. 4 transistors connects the emitter of No. 1 transistor, the grounded collector of No. 4 transistors;
The input of No. 2 inverters connects the source electrode of No. 25 metal-oxide-semiconductors, and the output of No. 2 inverters connects the input of No. 3 inverters;
The drain electrode of No. 31 metal-oxide-semiconductors connects reference current source, and the source electrode of No. 31 metal-oxide-semiconductors connects the drain electrode of No. 32 metal-oxide-semiconductors.
6. a kind of Ethernet power consumption equipment current foldback circuit according to claim 1; it is characterized in that, power supply circuits comprise voltage input end mouth, control signal input port, voltage sampling signal output port, switch power supply system, No. 1 electric capacity, No. 40 metal-oxide-semiconductors, No. 5 resistance.
7. a kind of Ethernet power consumption equipment current foldback circuit according to claim 6, it is characterized in that, voltage input end connects the left end of No. 1 electric capacity, and the right-hand member of No. 1 electric capacity connects the drain electrode of No. 40 metal-oxide-semiconductors;
The grid connection control signal input port of No. 40 metal-oxide-semiconductors, the source electrode of No. 40 metal-oxide-semiconductors connects the upper end of No. 5 resistance;
the upper end of No. 5 resistance connects voltage sampling signal output port, the lower end ground connection of No. 5 resistance.
8. a kind of Ethernet power consumption equipment current foldback circuit according to claim 1; it is characterized in that, delay circuit comprises threshold value switching signal input port, time delayed signal output port, 41 to No. 55 metal-oxide-semiconductors, 4 to No. 5 inverters, reference current source, No. 2 electric capacity.
9. a kind of Ethernet power consumption equipment current foldback circuit according to claim 8, is characterized in that, threshold value switching signal input port connects the grid of 46 and No. 49 metal-oxide-semiconductors, and time delayed signal output port connects the output of No. 5 inverters;
The drain electrode of No. 43 metal-oxide-semiconductors connects reference current source, the source ground of No. 43 metal-oxide-semiconductors;
The upper end of No. 2 electric capacity connects the grid of 53 and No. 54 metal-oxide-semiconductors, the lower end ground connection of No. 2 electric capacity;
The grid of No. 52 metal-oxide-semiconductors connects the grid of No. 55 metal-oxide-semiconductors, and the drain electrode of No. 52 metal-oxide-semiconductors connects the source electrode of No. 53 metal-oxide-semiconductors;
the grid of No. 53 metal-oxide-semiconductors connects the drain electrode of No. 46 metal-oxide-semiconductors, and the drain electrode of No. 53 metal-oxide-semiconductors connects the drain electrode of No. 54 metal-oxide-semiconductors;
The grid of No. 54 metal-oxide-semiconductors connects the drain electrode of No. 47 metal-oxide-semiconductors, and the drain electrode of No. 54 metal-oxide-semiconductors connects the input of No. 4 inverters;
The grid of No. 55 metal-oxide-semiconductors connects the source electrode of No. 49 metal-oxide-semiconductors, the source ground of No. 55 metal-oxide-semiconductors.
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| CN105548680A (en) * | 2015-12-05 | 2016-05-04 | 许昌学院 | Ethernet electric equipment power level detection circuit |
| CN105548671A (en) * | 2016-01-15 | 2016-05-04 | 中山芯达电子科技有限公司 | Voltage threshold value detection output circuit |
| CN116667268A (en) * | 2022-12-15 | 2023-08-29 | 荣耀终端有限公司 | Method for preventing triggering over-current protection and electronic equipment |
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| CN1917322A (en) * | 2005-08-18 | 2007-02-21 | 昂宝电子（上海）有限公司 | System and method for protecting and controlling power converter with constant maximum current |
| CN1936758A (en) * | 2005-09-21 | 2007-03-28 | 富士电机电子设备技术株式会社 | Overcurrent detecting circuit and reference voltage generating circuit |
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| CN105375211A (en) * | 2015-12-01 | 2016-03-02 | 上海斐讯数据通信技术有限公司 | Vibration protection circuit and socket |
| CN105375211B (en) * | 2015-12-01 | 2018-01-30 | 上海斐讯数据通信技术有限公司 | One kind vibrations protection circuit and socket |
| CN105548680A (en) * | 2015-12-05 | 2016-05-04 | 许昌学院 | Ethernet electric equipment power level detection circuit |
| CN105548671A (en) * | 2016-01-15 | 2016-05-04 | 中山芯达电子科技有限公司 | Voltage threshold value detection output circuit |
| CN116667268A (en) * | 2022-12-15 | 2023-08-29 | 荣耀终端有限公司 | Method for preventing triggering over-current protection and electronic equipment |
| CN116667268B (en) * | 2022-12-15 | 2024-07-12 | 荣耀终端有限公司 | Method for preventing triggering over-current protection and electronic equipment |
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