CN104901267B - A kind of Ethernet electrical equipment low-loss current foldback circuit - Google Patents
A kind of Ethernet electrical equipment low-loss current foldback circuit Download PDFInfo
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Abstract
The present invention provides a kind of Ethernet electrical equipment current foldback circuits comprising amplifying circuit, power supply circuit and delay circuit are compared in four parts, respectively threshold circuit.It is a primary object of the present invention to when preventing Ethernet electrical equipment from powering on and working normally, super-high-current is damaged caused by equipment.For the considerations of reducing circuit loss, the present invention has chosen relatively small protection threshold voltage.And in order to reduce the erroneous trigger of threshold voltage handoff procedure, the present invention is provided with related delay circuit.In order to effectively improve the precision of circuit control, compare amplifying circuit using process deviation small crystals pipe as positive input mouth and anti-phase input port, and introduce related resistors in threshold circuit to reduce the error of voltage sampling signal and threshold voltage signal.As it can be seen that the present invention is while effective protection ethernet device is powered on and worked normally, and have the advantages that low-loss and high accurancy and precision.
Description
Technical field
The present invention relates to the designs of ethernet device electricity consumption interface circuit, more particularly to, a kind of equipment electrical interface
The design of current foldback circuit.
Background technique
When ethernet device starts power up work, it may appear that overshoot current makes circuit and its device failure.Also, it is setting
During standby normal work, variation or short circuit due to load equally will appear biggish circuit damage equipment.Cause
This, it is necessary to the current foldback circuit of Ethernet electrical equipment is designed to protect equipment.Due in ethernet device power up,
Electric current increases rapidly within a short period of time, thus set overcurrent protection threshold value answer it is relatively small.And when equipment works normally,
A relatively large overcurrent protection threshold value should be set, to guarantee the normal work of equipment using IEEE802.3af standard as foundation.
It can be seen that ethernet device current foldback circuit there should be dual threshold, and can be switched over according to the working condition of equipment.In equipment
In the design of current foldback circuit, it is equally considered as the structure simplification and loss problem of circuit, so that circuit has more practicability.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of Ethernet electrical equipment current foldback circuits.
Technical scheme is as follows: Ethernet electrical equipment current foldback circuit includes four parts, is respectively
Threshold circuit compares amplifying circuit, power supply circuit and delay circuit.During device power, power supply circuit is by voltage sample
Signal is input to the inverting input terminal for comparing amplifying circuit by threshold circuit, while threshold circuit is by power-up state threshold voltage
Signal is input to the positive input for comparing amplifying circuit.Compare amplifying circuit to the signal of positive input and reverse input end
It is compared, and exports control signal, to limit the overshoot current of power supply circuit.When equipment from power-up state to work normally shape
When state changes, the voltage sampling signal of power supply circuit output can be pulled low to close to zero potential, and comparing amplifying circuit can defeated threshold value
Switching signal out is input to threshold circuit through delay circuit.When threshold circuit receives threshold value switching signal, circuit will according to when
Sequence logic output services state threshold voltage signal is to the positive input for comparing amplifying circuit.Zoom comparison circuit is according to work
State threshold voltage signal and voltage sampling signal output control signal, and overcurrent protection is carried out to equipment.
In Ethernet electrical equipment current foldback circuit, threshold circuit includes threshold value switching signal input terminal, voltage sample
Signal input part, voltage sampling signal output end, threshold voltage signal output end, 1 to No. 6 metal-oxide-semiconductor, 1 to No. 4 resistance, benchmark
Current source, No. 1 phase inverter.Threshold circuit can generate the threshold voltage of 11.5mV and 37mV respectively, when threshold value switching signal is
When low level, circuit output 11.5mV power-up state threshold voltage signal, when threshold value switching signal is high level, circuit output
37mV working condition threshold voltage signal.Wherein threshold value switching signal input terminal connects the grid of No. 2 metal-oxide-semiconductors by No. 1 phase inverter
Pole, and it is directly connected to the grid of No. 1 metal-oxide-semiconductor.Voltage sampling signal input terminal connects the upper end of No. 1 resistance and No. 2 resistance, voltage
Sampled signal output end connects the drain electrode of No. 1 metal-oxide-semiconductor and No. 2 metal-oxide-semiconductors.Threshold voltage signal output end connects No. 3 metal-oxide-semiconductors and 4
The drain electrode of number metal-oxide-semiconductor.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.3
The grid of number metal-oxide-semiconductor 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
Pole 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 No. 1 MOS
The grid of pipe, the lower end of the drain electrode connection reference current source of No. 5 metal-oxide-semiconductors.The grid of No. 6 metal-oxide-semiconductors connects the grid of No. 2 metal-oxide-semiconductors,
The drain electrode of drain electrode No. 5 metal-oxide-semiconductors of connection of No. 6 metal-oxide-semiconductors.In threshold circuit, it is defeated that the use of 1 to No. 4 resistance can eliminate two-way
Error of signal when relatively out, and the setting of small threshold voltage then can be effectively reduced the loss of circuit.
In Ethernet electrical equipment current foldback circuit, comparing amplifying circuit includes positive input mouth, inverting input terminal
Mouth, control signal output mouth, 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 phase inverters.In relatively amplifying circuit, positive input receives threshold voltage signal, and inverting input terminal receives electricity
Press sampled signal.Control signal output connects No. 40 metal-oxide-semiconductors of power supply circuit, limits the overshoot current in power supply circuit
System.The variation of threshold value switching signal output end signal is mainly according to voltage sampling signal, at the end of power-up state, voltage sample
For signal close to zero potential, threshold value switching signal is high level by low transition.Compare in amplifying circuit, positive input mouth connects
The base stage of No. 3 transistors is connect, anti-phase input port connects the base stage of No. 4 transistors.Control signal output mouth connects No. 33 MOS
The drain electrode of pipe, threshold value switching signal output port connect the output end of No. 2 phase inverters.The base stage of No. 1 transistor connects No. 2 crystal
The base stage of pipe, the collector of No. 1 transistor connect the drain electrode of No. 12 metal-oxide-semiconductors.The base stage of No. 2 transistors connects No. 13 metal-oxide-semiconductors
Source electrode, the collector of No. 2 transistors connect the drain electrode of No. 11 metal-oxide-semiconductors.The emitter of No. 3 transistors connects the hair of No. 2 transistors
Emitter-base bandgap grading, the grounded collector of No. 3 transistors.The emitter of No. 4 transistors connects the emitter of No. 1 transistor, No. 4 transistors
Grounded collector.The input terminal of No. 2 phase inverters connects the source electrode of No. 25 metal-oxide-semiconductors, and the output end of No. 2 phase inverters connects No. 3 reverse phases
The input terminal of device.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.
The use for comparing 1 to No. 4 transistor in amplifying circuit advantageously reduces the deviation of output control signal, makes Current limited Control effect
More precisely.
In Ethernet electrical equipment current foldback circuit, power supply circuit includes voltage input port, control signal input
Mouth, voltage sampling signal output port, switch power supply system, No. 1 capacitor, No. 40 metal-oxide-semiconductors, No. 5 resistance.In power supply circuit,
No. 40 metal-oxide-semiconductors, No. 5 resistance amplifying circuits compared with collectively constitute overshoot current limiting circuit, and the electric current in power supply circuit is limited
System is within safe range.In power up, since No. 1 capacitor is electrically charged, the current potential of voltage sampling signal output end is not by
Disconnected to drag down, when the current potential of voltage sampling signal output end is close to zero, power up terminates, and power supply circuit, which starts to work normally, to be supplied
Electricity.In power supply circuit, voltage input end connects the left end of No. 1 capacitor, and the right end of No. 1 capacitor connects the drain electrode of No. 40 metal-oxide-semiconductors.40
The grid of number metal-oxide-semiconductor connects control signal input mouth, and the source electrode of No. 40 metal-oxide-semiconductors connects the upper end of No. 5 resistance.No. 5 resistance
Upper end connects voltage sampling signal output port, the lower end ground connection of No. 5 resistance.
In Ethernet electrical equipment current foldback circuit, delay circuit includes threshold value switching signal input port, delay letter
Number output port, 41 to No. 55 metal-oxide-semiconductors, 4 to No. 5 phase inverters, reference current source, No. 2 capacitors.In delay circuit, amplification ratio
Compared with circuit output threshold value switching signal as the input of delay circuit, and the threshold value switching signal after being delayed is input into threshold
It is worth in circuit.The use of delay circuit is primarily to avoid the threshold value switching signal erroneous trigger as caused by interference.Delay
In 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 No. 5 instead
The output end of phase device.The drain electrode of No. 43 metal-oxide-semiconductors connects reference current source, the source electrode ground connection of No. 43 metal-oxide-semiconductors.The upper end of No. 2 capacitors
Connect the grid of 53 and No. 54 metal-oxide-semiconductors, the lower end ground connection of No. 2 capacitors.The grid of No. 52 metal-oxide-semiconductors connects the grid of No. 55 metal-oxide-semiconductors,
The source electrode of drain electrode No. 53 metal-oxide-semiconductors of connection of No. 52 metal-oxide-semiconductors.The grid of No. 53 metal-oxide-semiconductors connects the drain electrode of No. 46 metal-oxide-semiconductors, No. 53 MOS
The drain electrode of drain electrode No. 54 metal-oxide-semiconductors of connection of pipe.The grid of No. 54 metal-oxide-semiconductors connects the drain electrode of No. 47 metal-oxide-semiconductors, the leakage of No. 54 metal-oxide-semiconductors
Pole connects the input terminal of No. 4 phase inverters.The grid of No. 55 metal-oxide-semiconductors connects the source electrode of No. 49 metal-oxide-semiconductors, and the source electrode of No. 55 metal-oxide-semiconductors connects
Ground.
Overcurrent protection when powering on and work normally present invention is mainly used for ethernet device.It is marked 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 working condition.Out
In reduce circuit loss the considerations of, the present invention has chosen relatively small protection threshold voltage.And it is cut to reduce threshold voltage
The erroneous trigger of process is changed, the present invention is provided with the delay circuit of 450us.In order to effectively improve the precision of circuit control, than
Compared with amplifying circuit using process deviation small crystals pipe as positive input mouth and anti-phase input port, and in threshold circuit
1 to No. 4 resistance is introduced to reduce the error of voltage sampling signal and threshold voltage signal.As it can be seen that the present invention effective protection with
Too net device power and while work normally, and has the advantages that low-loss and high accurancy and precision.
Detailed description of the invention
Fig. 1 is circuit system block diagram of the invention；
Fig. 2 is the circuit diagram of threshold circuit of the invention；
Fig. 3 is the circuit diagram of comparison amplifying circuit of the invention；
Fig. 4 is the circuit diagram of power supply circuit of the invention；
Fig. 5 is the circuit diagram of delay circuit of the invention.
Specific embodiment
To facilitate the understanding of the present invention, in the following with reference to the drawings and specific embodiments, the present invention will be described in more detail.
This specification and its a better embodiment of the invention is given in the attached drawing, still, the present invention can be in many different forms
To realize, however it is not limited to this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to the present invention
Disclosure understanding it is more thorough and comprehensive.
It should be noted that be fixed on another element when a certain element, including that the element is directly fixed on this is another
A element, or the element is fixed on another element by least one other element placed in the middle.When an element connects
Another element is connect, including the element is directly connected to another element, or the element is placed in the middle by least one
Other elements be connected to another element.
As shown in Figure 1, the present invention include four parts, be respectively threshold circuit, compare amplifying circuit, power supply circuit and
Delay circuit.During device power, voltage sampling signal Vsmp is input to compare and be put by power supply circuit by threshold circuit
The inverting input terminal of big circuit, while 11.5mV power-up state threshold voltage signal Vtal is input to and compares amplification by threshold circuit
The positive input of circuit.Compare amplifying circuit to be compared the signal of positive input and reverse input end, and exports control
Signal Vcon processed, to limit the overshoot current of power supply circuit.When equipment changes from power-up state to normal operating conditions, power supply
The voltage sampling signal Vsmp of circuit output can be pulled low to close to zero potential, and threshold value switching signal can be exported by comparing amplifying circuit
Vins is input to threshold circuit through delay circuit.When threshold circuit receives threshold value switching signal Vins, circuit will be according to timing
Logic exports 37mV working condition threshold voltage signal Vtal to the positive input for comparing amplifying circuit.Threshold circuit is according to work
Make state threshold voltage signal Vtal and voltage sampling signal Vsmp and overcurrent protection is carried out to equipment.
As shown in Fig. 2, threshold circuit include threshold value switching signal input terminal Vins, voltage sampling signal input terminal Vsmp,
Voltage sampling signal output end Vn, threshold voltage signal output end Vtal, metal-oxide-semiconductor M1 to M6, electricity R1 to R4, reference current source
Ib, phase inverter T1.Threshold circuit can generate the threshold voltage of 11.5mV and 37mV respectively, when threshold value switching signal Vins is low
When level, circuit output 11.5mV power-up state threshold voltage signal Vtal, when threshold value switching signal Vins is high level, electricity
Road exports 37mV working condition threshold voltage signal Vtal.Wherein threshold value switching signal input terminal Vins is connected by phase inverter T1
The grid of metal-oxide-semiconductor M2, and it is directly connected to the grid of metal-oxide-semiconductor M1.Voltage sampling signal input terminal Vsmp connection resistance R1 and resistance
The upper end of R2, the drain electrode of voltage sampling signal output end Vn connection metal-oxide-semiconductor M1 and metal-oxide-semiconductor M2.Threshold voltage signal output end
The drain electrode of Vtal connection metal-oxide-semiconductor M3 and metal-oxide-semiconductor M4.The lower end of the source electrode connection resistance R2 of metal-oxide-semiconductor M1, the connection of metal-oxide-semiconductor M2 source electrode
The lower end of resistance R1.The grid of the grid connection metal-oxide-semiconductor M6 of metal-oxide-semiconductor M3, the upper end of the source electrode connection resistance R4 of metal-oxide-semiconductor M3.MOS
The grid of the grid connection metal-oxide-semiconductor M5 of pipe M4, the upper end of the source electrode connection resistance R3 of metal-oxide-semiconductor M4.The grid of metal-oxide-semiconductor M5 connects
The grid of metal-oxide-semiconductor M1, the lower end of the drain electrode connection reference current source ib of metal-oxide-semiconductor M5.The grid connection metal-oxide-semiconductor M2's of metal-oxide-semiconductor M6
Grid, the drain electrode of the drain electrode connection metal-oxide-semiconductor M5 of metal-oxide-semiconductor M6.In threshold circuit, the use of resistance R1 to R4 can eliminate two-way
Error of output signal when relatively, and the setting of small threshold voltage then can be effectively reduced the loss of circuit.
As shown in figure 3, compare amplifying circuit include positive input mouth Vtal, anti-phase input port Vn, control signal it is defeated
It is exit port Vcon, threshold value switching signal output port Vins, metal-oxide-semiconductor M7 to M39, transistor Q1 to Q4, reference current source ia, anti-
Phase device T2 to T3.In relatively amplifying circuit, positive input Vtal receives threshold voltage signal Vtal, and inverting input terminal Vn connects
Receive voltage sampling signal Vsmp.The metal-oxide-semiconductor M40 of control signal output Vcon connection power supply circuit, to the mistake in power supply circuit
Electric current is rushed to be limited.The variation of threshold value switching signal output end Vins signal is mainly according to voltage sampling signal Vsmp, when upper
At the end of electricity condition, for voltage sampling signal Vsmp close to zero potential, threshold value switching signal Vins is high level by low transition.
Compare in amplifying circuit, the base stage of positive input mouth Vtal connection transistor Q3, anti-phase input port Vn connection transistor Q4
Base stage.The drain electrode of control signal output mouth Vcon connection metal-oxide-semiconductor M33, threshold value switching signal output port Vins connection are anti-
The output end of phase device T2.The base stage of the base stage connection transistor Q2 of transistor Q1, the collector of transistor Q1 connect metal-oxide-semiconductor M12
Drain electrode.The source electrode of the base stage connection metal-oxide-semiconductor M13 of transistor Q2, the drain electrode of the collector connection metal-oxide-semiconductor M11 of transistor Q2.It is brilliant
The emitter of the emitter connection transistor Q2 of body pipe Q3, the grounded collector of transistor Q3.The emitter of transistor Q4 connects
The emitter of transistor Q1, the grounded collector of transistor Q4.The source electrode of the input terminal connection metal-oxide-semiconductor M25 of phase inverter T2, reverse phase
The input terminal of the output end connection phase inverter T3 of device T2.The drain electrode of metal-oxide-semiconductor M31 connects reference current source ia, the source of metal-oxide-semiconductor M31
The drain electrode of pole connection metal-oxide-semiconductor M32.The use for comparing transistor Q1 to Q4 in amplifying circuit advantageously reduces output control signal
The deviation of Vcon keeps Current limited Control effect more accurate.
As shown in figure 4, power supply circuit includes voltage input port Vin, control signal input mouth Vcon, voltage sample letter
Number output port Vsmp, switch power supply system, capacitor c1, metal-oxide-semiconductor M40, resistance R5.In power supply circuit, metal-oxide-semiconductor M40, resistance
R5 amplifying circuit compared with collectively constitutes overshoot current limiting circuit, by the current limit in power supply circuit safe range it
It is interior.In power up, since capacitor C1 is electrically charged, the current potential of voltage sampling signal output end Vsmp is constantly dragged down, and works as electricity
When pressing the current potential of sampled signal output end Vsmp close to zero, power up terminates, and power supply circuit starts to work normally power supply.Power supply
In circuit, voltage input end connects the left end of capacitor C1, the drain electrode of the right end connection metal-oxide-semiconductor M40 of capacitor C1.The grid of metal-oxide-semiconductor M40
Pole connects control signal input mouth Vcon, the upper end of the source electrode connection resistance R5 of metal-oxide-semiconductor M40.The upper end of resistance R5 connects electricity
Press sampled signal output port Vsmp, the lower end ground connection of resistance R5.
As shown in figure 5, delay circuit includes threshold value switching signal input terminal in Ethernet electrical equipment current foldback circuit
Mouth Vins, time delayed signal output port Vdel, metal-oxide-semiconductor M41 to M55, phase inverter T4 to T5, reference current source ic, capacitor C2.?
In delay circuit, the threshold value switching signal Vins of zoom comparison circuit output as delay circuit input, and after being delayed
Threshold value switching signal Vins is input into threshold circuit.The use of delay circuit is primarily to avoid as caused by interference
Threshold value switching signal erroneous trigger.In delay circuit, the grid of threshold value switching signal input port Vins connection metal-oxide-semiconductor M46 and M49
Pole, the output end of time delayed signal output port Vdel connection phase inverter T5.The drain electrode of metal-oxide-semiconductor M43 connects reference current source ic,
The source electrode of metal-oxide-semiconductor M43 is grounded.The grid of upper end connection the metal-oxide-semiconductor M53 and M54 of capacitor C2, the lower end ground connection of capacitor C2.Metal-oxide-semiconductor
The grid of the grid connection metal-oxide-semiconductor M55 of M52, the source electrode of the drain electrode connection metal-oxide-semiconductor M53 of metal-oxide-semiconductor M52.The grid of metal-oxide-semiconductor M53 connects
Connect the drain electrode of metal-oxide-semiconductor M46, the drain electrode of the drain electrode connection metal-oxide-semiconductor M54 of metal-oxide-semiconductor M53.The grid of metal-oxide-semiconductor M54 connects metal-oxide-semiconductor M47
Drain electrode, metal-oxide-semiconductor M54 drain electrode connection phase inverter T4 input terminal.The source electrode of the grid connection metal-oxide-semiconductor M49 of metal-oxide-semiconductor M55,
The source electrode of metal-oxide-semiconductor M55 is grounded.
Further, the embodiment of the present invention further includes that each technical characteristic of the various embodiments described above is combined with each other formation
Secondary temperature compensated reference source.
It should be noted that above-mentioned each technical characteristic continues to be combined with each other, the various embodiments not being enumerated above are formed,
It is accordingly to be regarded as the range of description of the invention record；Also, for those of ordinary skills, it can add according to the above description
To improve or convert, and all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (1)
1. a kind of Ethernet electrical equipment current foldback circuit, which is characterized in that it include threshold circuit, compare amplifying circuit,
Power supply circuit and delay circuit；
Threshold circuit includes threshold value switching signal input terminal, voltage sampling signal input terminal, voltage sampling signal output end, threshold value
Voltage signal output end, metal-oxide-semiconductor M1 to M6, resistance R1 to R4, reference current source ib, phase inverter T1；
Threshold value switching signal input terminal passes through the grid of phase inverter T1 connection metal-oxide-semiconductor M2, and is directly connected to the grid of metal-oxide-semiconductor M1；
Voltage sampling signal input terminal connects the upper end of resistance R1 and resistance R2, and voltage sampling signal output end connects metal-oxide-semiconductor M1 and MOS
The drain electrode of pipe M2；The drain electrode of threshold voltage signal output end connection metal-oxide-semiconductor M3 and metal-oxide-semiconductor M4；The source electrode of metal-oxide-semiconductor M1 connects resistance
The lower end of R2, metal-oxide-semiconductor M2 source electrode connect the lower end of resistance R1；The grid of the grid connection metal-oxide-semiconductor M6 of metal-oxide-semiconductor M3, metal-oxide-semiconductor M3's
The upper end of source electrode connection resistance R4；The grid of the grid connection metal-oxide-semiconductor M5 of metal-oxide-semiconductor M4, the source electrode connection resistance R3's of metal-oxide-semiconductor M4
Upper end；The grid of the grid connection metal-oxide-semiconductor M1 of metal-oxide-semiconductor M5, the lower end of the drain electrode connection reference current source ib of metal-oxide-semiconductor M5；Metal-oxide-semiconductor
The grid of the grid connection metal-oxide-semiconductor M2 of M6, the drain electrode of the drain electrode connection metal-oxide-semiconductor M5 of metal-oxide-semiconductor M6；The source electrode of metal-oxide-semiconductor M5 connects electricity
Hinder the upper end of R3, the upper end of the source electrode connection resistance R4 of metal-oxide-semiconductor M6；
Power supply circuit includes voltage input port Vin, control signal input mouth, voltage sampling signal output port, switch electricity
Source system, capacitor C1, metal-oxide-semiconductor M40, resistance R5；
The left end of voltage input port Vin connection capacitor C1, the drain electrode of the right end connection metal-oxide-semiconductor M40 of capacitor C1；Metal-oxide-semiconductor M40's
Grid connects control signal input mouth, the upper end of the source electrode connection resistance R5 of metal-oxide-semiconductor M40；The upper end of resistance R5 connects voltage
Sampled signal output port, the lower end ground connection of resistance R5；The input terminal of switch power supply system connects voltage input port Vin, and
The left end of capacitor C1, the drain electrode of the output end connection metal-oxide-semiconductor M40 of switch power supply system are connected, and connects the right end of capacitor C1；
The voltage sampling signal input terminal of the voltage sampling signal output port connection threshold circuit of power supply circuit, threshold circuit
The connection of threshold voltage signal output end compare the positive input mouth of amplifying circuit, the voltage sampling signal output of threshold circuit
The anti-phase input port of amplifying circuit is compared in end connection, compares the control signal output mouth connection power supply circuit of amplifying circuit
Control signal input mouth, compare amplifying circuit threshold value switching signal output port connection delay circuit threshold value switching letter
Number input port, the threshold value switching signal input terminal of the time delayed signal output port connection threshold circuit of delay circuit.
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| CN201510342650.9A CN104901267B (en) | 2015-06-19 | 2015-06-19 | A kind of Ethernet electrical equipment low-loss current foldback circuit |
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| CN201510342650.9A CN104901267B (en) | 2015-06-19 | 2015-06-19 | A kind of Ethernet electrical equipment low-loss current foldback circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN105548680B (en) * | 2015-12-05 | 2020-05-05 | 许昌学院 | Ethernet consumer 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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| US6121792A (en) * | 1997-09-29 | 2000-09-19 | Nec Corporation | Input circuit having current control |
| CN1430314A (en) * | 2001-12-31 | 2003-07-16 | 深圳市中兴通讯股份有限公司上海第二研究所 | Short-circuit protective circuit |
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| US6121792A (en) * | 1997-09-29 | 2000-09-19 | Nec Corporation | Input circuit having current control |
| CN1430314A (en) * | 2001-12-31 | 2003-07-16 | 深圳市中兴通讯股份有限公司上海第二研究所 | Short-circuit protective circuit |
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