CN204168139U - The buffer circuit of power input - Google Patents
The buffer circuit of power input Download PDFInfo
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- CN204168139U CN204168139U CN201420505608.5U CN201420505608U CN204168139U CN 204168139 U CN204168139 U CN 204168139U CN 201420505608 U CN201420505608 U CN 201420505608U CN 204168139 U CN204168139 U CN 204168139U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 41
- 230000001681 protective effect Effects 0.000 claims description 33
- 238000000034 method Methods 0.000 abstract description 3
- 238000002955 isolation Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 3
- 230000035939 shock Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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Abstract
The utility model provides a kind of buffer circuit of power input, and this buffer circuit comprises: network rectification circuit, current-collection protection circuit and Power over Ethernet POE power conversion circuit; The output of described network rectification circuit is connected with the first input end of described current-collection protection circuit; Second input of described current-collection protection circuit is connected with external dc power interface; The output of described current-collection protection circuit is connected with the input of described POE power conversion circuit; The output of described POE power conversion circuit is used for powering to power receiving equipment.Carry out current-collection protection by the voltage exported by network rectification circuit, under guarantee low pressure, power stage can meet the requirement of power receiving equipment, then provides the stable power supply after process by POE power conversion circuit to power receiving equipment.
Description
Technical field
The utility model relates to circuit design technique, particularly relates to a kind of buffer circuit of power input.
Background technology
In circuit design field; the Circuits System of powering for any needs all needs design isolated protective circuit; be used for realizing the function such as control and reverse power connection protection of power supply input range, power, particularly in the front end input circuit of electron trade, isolation protective circuit is particularly important.
In prior art, the buffer circuit carrying out designing for front end input circuit mainly adopts single-chip to complete, specifically comprise: network rectification circuit, PDM keyer, Power over Ethernet is (English: PowerOver Ethernet, be called for short: POE) power transformer and feedback circuit composition, network rectification circuit comprises the network interface of standard, network transformer, ethernet physical layer and diode rectifier bridge, when powering, after PDM keyer detects that the output of whole buffer circuit is connected to power receiving equipment, power supply unit starts from low-voltage to supplying power for powered device, through over commutation, it is 48V that modulation and efficiency are changed photovoltaic conversion, the DC power supply of 48V is provided to power receiving equipment.
But above-mentioned buffer circuit is when supply voltage is lower, and power output and power supply conversion efficiency are all very little, the normal work of successive load can not be ensured.
Utility model content
The utility model provides a kind of buffer circuit of power input, and in order to overcome buffer circuit of the prior art when supply voltage is lower, power output and power supply conversion efficiency are all very little, can not ensure the problem of the normal work of successive load.
The utility model provides a kind of buffer circuit of power input, comprising:
Network rectification circuit, current-collection protection circuit and Power over Ethernet POE power conversion circuit;
The output of described network rectification circuit is connected with the first input end of described current-collection protection circuit; Second input of described current-collection protection circuit is connected with external dc power interface; The output of described current-collection protection circuit is connected with the input of described POE power conversion circuit;
The output of described POE power conversion circuit is used for powering to power receiving equipment.
Further, also comprise: counnter attack protective circuit; The input of described counnter attack protective circuit is connected with external dc power interface, and the output of described counnter attack protective circuit is connected with the second input of described current-collection protection circuit.
Further, also comprise: enable switch control circuit; The input of described enable switch control circuit is connected with external dc power interface; The output of described enable switch control circuit is connected with the 3rd input of described current-collection protection circuit.
Further, described current-collection protection circuit specifically comprises power receiving equipment controller, step-down switching controller and clamping protective circuit;
The input of described power receiving equipment controller is connected with the output of described network rectification circuit; The output of described power receiving equipment controller is connected with the input of described step-down switching controller respectively with the output of described enable switch control circuit; The input of described clamping protective circuit is connected with the output of described counnter attack protective circuit; The output of described step-down switching controller is all connected with the input of described POE power conversion circuit with the output of described clamping protective circuit.
Further, described POE power conversion circuit specifically comprises insulating power supply module controller, POE power transformer and feedback circuit;
The output of described step-down switching controller is all connected with the input of described insulating power supply module controller with the output of described clamping protective circuit; The output of described insulating power supply module controller is connected with the input of described POE power transformer; The output of described POE power transformer is used for powering to power receiving equipment;
The input of described feedback circuit is connected with the output of described POE power transformer, and the output of described feedback circuit is connected with the feedback input end of described insulating power supply module controller.
The buffer circuit of the power input that the utility model provides, by increasing current-collection protection circuit after network rectification circuit, and POE power conversion circuit, realize the real-time monitoring to power receiving equipment, according to the voltage strength of input, voltage is remained in certain scope, to overcome buffer circuit of the prior art when supply voltage is lower, the problem of successive load work can not be ensured, increase current-collection protection circuit, there is the POE power conversion circuit of isolation features, ensure when input voltage, the voltage exported and power can meet the demand of successive load, improve the conversion efficiency of power output.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the principle schematic of the embodiment one of the buffer circuit of the utility model power input;
Fig. 2 is the principle schematic of the embodiment two of the buffer circuit of the utility model power input;
Fig. 3 is the principle schematic of the embodiment three of the buffer circuit of the utility model power input;
Fig. 4 is the principle schematic of the embodiment four of the buffer circuit of the utility model power input.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is the principle schematic of the embodiment one of the buffer circuit of the utility model power input, and as described in Figure 1, the buffer circuit of this power input, comprising: network rectification circuit 11, current-collection protection circuit 12 and Power over Ethernet POE power conversion circuit 13.Wherein, the output 112 of described network rectification circuit 11 is connected with the first input end 121 of described current-collection protection circuit 12; Second input 122 of described current-collection protection circuit 12 is connected with external dc power interface; The output 122 of described current-collection protection circuit 12 is connected with the input 131 of described POE power conversion circuit 13; The output 132 of described POE power conversion circuit 13 is for powering to power receiving equipment.
In the present embodiment, this network rectification circuit 11 is with existing similar, comprise the network transformer and diode rectifier bridge that pick out from NET SOCKET network interface, and be also connected with diode rectifier bridge in the output of the latter linked ethernet physical layer network transformer of network transformer, common network consisting rectification circuit, for carrying out rectification DC power output by the alternating current in network interface.
This current-collection protection circuit is not when having outside input; whole buffer circuit rear can be detected in real time and whether connect power receiving equipment; if detect after being connected to power receiving equipment; classify with POE power conversion circuit 13 pairs of power receiving equipments; assess the power loss needed for this power receiving equipment; POE power conversion circuit carries out corresponding power transfer, for power receiving equipment provides stable voltage.
The buffer circuit of the power input that the present embodiment provides, by increasing current-collection protection circuit after network rectification circuit, and POE power conversion circuit, realize the real-time monitoring to power receiving equipment, according to the voltage strength of input, voltage is remained in certain scope, to overcome buffer circuit of the prior art when supply voltage is lower, the problem of successive load work can not be ensured, increase current-collection protection circuit, there is the POE power conversion circuit of isolation features, ensure when input voltage, the voltage exported and power can meet the demand of successive load, improve the conversion efficiency of power output.
Fig. 2 is the principle schematic of the embodiment two of the buffer circuit of the utility model power input, and as shown in Figure 2, on the basis of the embodiment shown in above-mentioned Fig. 1, the buffer circuit of this power input also comprises: counnter attack protective circuit 14; The input 141 of described counnter attack protective circuit 14 is connected with external dc power interface, and the output 142 of described counnter attack protective circuit 14 is connected with the second input 123 of described current-collection protection circuit 12.
In the present embodiment, before the second input 123 of current-collection protection circuit 12, also be connected to counnter attack protective circuit 14, outside DC power supply is connected with current-collection protection circuit 12 by this counnter attack protective circuit 14, this counnter attack protective circuit 14 generally adopts metal-oxide semiconductor (MOS) (English: Metal OxidSemiconductor, be called for short: MOS) the anti-circnit NOT of structure, before being connected to DC power supply and current-collection protection circuit 12, utilize the switching characteristic of MOS structure, being turned on or off of control circuit, because the internal resistance of MOS structure is very little, the chip of present selection can accomplish milliohm level, mode reverse power connection is to the impact failure of load.
Concrete, the metal-oxide-semiconductor commonly used can be selected to use, be serially connected with between DC power supply interface and load equipment (power receiving equipment) by S pin and D pin, resistance Rg provides voltage bias for metal-oxide-semiconductor.
The buffer circuit of the power input that the present embodiment provides, by increasing current-collection protection circuit after network rectification circuit, and POE power conversion circuit, realize the real-time monitoring to power receiving equipment, according to the voltage strength of input, voltage is remained in certain scope, to overcome buffer circuit of the prior art when supply voltage is lower, the problem of successive load work can not be ensured, increase current-collection protection circuit, there is the POE power conversion circuit of isolation features, ensure when input voltage, the voltage exported and power can meet the demand of successive load, improve the conversion efficiency of power output, and counnter attack protective circuit is increased between DC power supply interface and current-collection protection circuit, solve the high pressure of moment during reverse power connection and the high-power shock problem to power receiving equipment, the fail safe of effective this buffer circuit of raising.
Fig. 3 is the principle schematic of the embodiment three of the buffer circuit of the utility model power input, and as shown in Figure 3, on the basis of the embodiment shown in above-mentioned Fig. 1, Fig. 2, the buffer circuit of this power input also comprises: enable switch control circuit 15; The input 151 of described enable switch control circuit 15 is connected with external dc power interface; The output 152 of described enable switch control circuit 15 is connected 124 with the 3rd input of described current-collection protection circuit 12.
In the present embodiment, this enable switch control circuit 15 for DC power supply and network rectification circuit 11 simultaneously input voltage time, switching can be carried out by hardware and control enable.
The buffer circuit of the power input that the present embodiment provides, by increasing current-collection protection circuit after network rectification circuit, and POE power conversion circuit, realize the real-time monitoring to power receiving equipment, according to the voltage strength of input, voltage is remained in certain scope, to overcome buffer circuit of the prior art when supply voltage is lower, the problem of successive load work can not be ensured, increase current-collection protection circuit, there is the POE power conversion circuit of isolation features, ensure when input voltage, the voltage exported and power can meet the demand of successive load, improve the conversion efficiency of power output, and counnter attack protective circuit is increased between DC power supply interface and current-collection protection circuit, solve the high pressure of moment during reverse power connection and the high-power shock problem to power receiving equipment, and increase enable switching switch circuit, by hardware exchange powered types, the fail safe of effective this buffer circuit of raising.
Fig. 4 is the principle schematic of the embodiment four of the buffer circuit of the utility model power input, as shown in Figure 4, on the basis of above-mentioned all embodiments, concrete, described current-collection protection circuit 12 specifically comprises power receiving equipment controller 21, step-down switching controller 22 and clamping protective circuit 23; The input 211 of described power receiving equipment controller 21 is connected with the output 112 of described network rectification circuit 11; The output 212 of described power receiving equipment controller 21 is connected with the input 221 of described step-down switching controller 22 respectively with the output 152 of described enable switch control circuit 15; The input 231 of described clamping protective circuit 23 is connected with the output 142 of described counnter attack protective circuit 14; The output 222 of described step-down switching controller 22 is all connected with the input of described POE power conversion circuit with the output 232 of described clamping protective circuit 23.
Described POE power conversion circuit 13 specifically comprises insulating power supply module controller 31, POE power transformer 32 and feedback circuit 33; The output 222 of described step-down switching controller 22 is all connected with the input 311 of described insulating power supply module controller 31 with the output 232 of described clamping protective circuit 23; The output 312 of described insulating power supply module controller 31 is connected with the input 321 of described POE power transformer 32; The output 322 of described POE power transformer 32 is for powering to power receiving equipment; The input 331 of described feedback circuit 33 is connected with the output 322 of described POE power transformer 32, and the output 332 of described feedback circuit 33 is connected with the feedback input end 313 of described insulating power supply module controller 31.
In the present embodiment; clamping protective circuit 23 is selected clamp supply chip to realize; the effect of clamping protective circuit 23 is remained in the top of periodically variable waveform or bottom in a certain DC level determined; utilize the conduction voltage drop of clamp supply chip relatively stable; and the feature that numerical value is less, carry out the current potential of demand point in limiting circuit.The insulating power supply integrated circuit selecting conversion efficiency higher, under ensureing low pressure, power stage meets the demands.Conversion efficiency is exactly the power output of power supply and the ratio of input power: i.e. real-time power × 100% of instant power output/input power that provides for main frame of power supply conversion efficiency=power supply, efficient insulating power supply module controller selected by buffer circuit after the present embodiment improves, its conversion efficiency reaches more than 90%, thus meets the power transfer requirement of complete machine.
On the basis of each embodiment above-mentioned, the course of work of the buffer circuit of this power input is described below especially exemplified by an example.
Concrete, suppose to arrange Power over Ethernet in certain network, the network interface of feeder ear equipment connects in the present embodiment, the Power over Ethernet course of work is as follows:
First, power supply unit exports very little voltage at network interface, until it detects that being connected to of the output of the buffer circuit of power input is a power receiving equipment supporting IEEE 802.3af standard, power supply unit is classified to power receiving equipment according to the result detected, the power loss of assessment required for power receiving equipment.
Secondly, within the starting period of a configurable time (being generally less than 15 μ s), power supply unit starts to power from low-voltage to power receiving equipment, the alternating current of output is arranged by the buffer circuit provided by the present embodiment, and carry out power transfer, until provide the DC power supply of 48V to power receiving equipment, the power of the power receiving equipment generally met is less than 15.4W.
If when power receiving equipment disconnects from network, namely disconnect after not needing to power, this power supply unit will (generally within 300 ~ 400ms) stop powering for power receiving equipment rapidly, and whether duplicate detection process connects the power receiving equipment of needs power supply with the output detecting this buffer circuit, if detect, repeats above-mentioned steps.
Especially, if when accessing outside DC power supply on the buffer circuit of this power input, hardware-enabled directly can close the network electric power path by Power over Ethernet, makes the DC power supply of outside access become main electricity, ensure that the normal operation of equipment.Namely no matter with or without the input of POE power supply, when there being DC power supply to input, all can being switched or software exchange by hardware-enabled, unconditionally selecting DC channel.
The buffer circuit of the power input that the present embodiment provides, can meet the expansion of low-tension supply scope, can increase again the output of power, decreases the loss in circuit, thus improves conversion efficiency, and effectively improves the fail safe of circuit.
Last it is noted that above each embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to foregoing embodiments, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.
Claims (5)
1. a buffer circuit for power input, is characterized in that, comprising:
Network rectification circuit, current-collection protection circuit and Power over Ethernet POE power conversion circuit;
The output of described network rectification circuit is connected with the first input end of described current-collection protection circuit; Second input of described current-collection protection circuit is connected with external dc power interface; The output of described current-collection protection circuit is connected with the input of described POE power conversion circuit;
The output of described POE power conversion circuit is used for powering to power receiving equipment.
2. buffer circuit according to claim 1, is characterized in that, also comprises: counnter attack protective circuit; The input of described counnter attack protective circuit is connected with external dc power interface, and the output of described counnter attack protective circuit is connected with the second input of described current-collection protection circuit.
3. buffer circuit according to claim 2, is characterized in that, also comprises: enable switch control circuit; The input of described enable switch control circuit is connected with external dc power interface; The output of described enable switch control circuit is connected with the 3rd input of described current-collection protection circuit.
4. buffer circuit according to claim 3, is characterized in that, described current-collection protection circuit specifically comprises power receiving equipment controller, step-down switching controller and clamping protective circuit;
The input of described power receiving equipment controller is connected with the output of described network rectification circuit; The output of described power receiving equipment controller is connected with the input of described step-down switching controller respectively with the output of described enable switch control circuit; The input of described clamping protective circuit is connected with the output of described counnter attack protective circuit; The output of described step-down switching controller is all connected with the input of described POE power conversion circuit with the output of described clamping protective circuit.
5. buffer circuit according to claim 4, is characterized in that, described POE power conversion circuit specifically comprises insulating power supply module controller, POE power transformer and feedback circuit;
The output of described step-down switching controller is all connected with the input of described insulating power supply module controller with the output of described clamping protective circuit; The output of described insulating power supply module controller is connected with the input of described POE power transformer; The output of described POE power transformer is used for powering to power receiving equipment;
The input of described feedback circuit is connected with the output of described POE power transformer, and the output of described feedback circuit is connected with the feedback input end of described insulating power supply module controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420505608.5U CN204168139U (en) | 2014-09-03 | 2014-09-03 | The buffer circuit of power input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420505608.5U CN204168139U (en) | 2014-09-03 | 2014-09-03 | The buffer circuit of power input |
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| Publication Number | Publication Date |
|---|---|
| CN204168139U true CN204168139U (en) | 2015-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420505608.5U Expired - Lifetime CN204168139U (en) | 2014-09-03 | 2014-09-03 | The buffer circuit of power input |
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| CN (1) | CN204168139U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114514728A (en) * | 2019-11-01 | 2022-05-17 | 思科技术公司 | Initialization and synchronization of pulse power in a network system |
| US12126399B2 (en) | 2019-11-01 | 2024-10-22 | Cisco Technology, Inc. | Fault managed power with dynamic and adaptive fault sensor |
-
2014
- 2014-09-03 CN CN201420505608.5U patent/CN204168139U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114514728A (en) * | 2019-11-01 | 2022-05-17 | 思科技术公司 | Initialization and synchronization of pulse power in a network system |
| US11916614B2 (en) | 2019-11-01 | 2024-02-27 | Cisco Technology, Inc. | Initialization and synchronization for pulse power in a network system |
| US11990952B2 (en) | 2019-11-01 | 2024-05-21 | Cisco Technology, Inc. | Initialization and synchronization for pulse power in a network system |
| US12113588B2 (en) | 2019-11-01 | 2024-10-08 | Cisco Technology, Inc. | Initialization and synchronization for pulse power in a network system |
| US12126399B2 (en) | 2019-11-01 | 2024-10-22 | Cisco Technology, Inc. | Fault managed power with dynamic and adaptive fault sensor |
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| C14 | Grant of patent or utility model | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20150218 |
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| CX01 | Expiry of patent term |