CN205584004U - Power supply switch circuit and power supply system - Google Patents
Power supply switch circuit and power supply system Download PDFInfo
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- CN205584004U CN205584004U CN201620114450.8U CN201620114450U CN205584004U CN 205584004 U CN205584004 U CN 205584004U CN 201620114450 U CN201620114450 U CN 201620114450U CN 205584004 U CN205584004 U CN 205584004U
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- current limiting
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Abstract
The utility model discloses a power supply switch circuit, include: current limiting switch chip and power input connector module, the current limiting switch chip has first messenger ability control end, is used for the switch input end, is used for switched output end and electric current threshold value end, the power input connector module has the second makes ability control end, power supply input terminal, confession electrical output and earthing terminal, the first messenger of current limiting switch chip can the control end with the second of power input connector module makes can be connected by the control end, the second of power input connector module make can the control end pass through the switching element with the earthing terminal of power input connector module is connected. Correspondingly, the utility model also discloses a power supply system. Implement the utility model discloses, in preventing the anti - system circuit who irritates the USB interface of peripheral equipment's electric current, avoid peripheral equipment powering insufficient.
Description
Technical field
This utility model relates to electronic technology field, is specifically related to a kind of power switch circuit and electric power system.
Background technology
The generally power switch circuit of USB interface is the opening or closing of I/O port controlling power switch circuit directly using circuit system, realize the power supply of USB interface, and cause electric current excessive in order to avoid the short circuit of USB interface feeder ear, and power switch circuit is set there is the effect of current limliting.
See Fig. 1, being the structural representation of the power switch circuit that prior art provides, this power switch circuit includes that current limiting switch chip U1, the EN foot of current limiting switch chip U1 are connected with the I/O port of circuit system, IN foot is switch input terminal, and OUT foot is connected with USB interface；When the I/O port of circuit system exports high level, current limiting switch chip U1 is in open mode so that the power supply of circuit system is inputted by the IN foot of current limiting switch chip U1, and by OUT foot one electric current of output of current limiting switch chip U1 to USB interface；When the I/O port output low level of circuit system, current limiting switch chip U1 is closed, and the power supply of circuit system cannot be inputted by the IN foot of current limiting switch chip U1, then the OUT foot of current limiting switch chip U1 cannot export one and supply electricity to USB interface.Meanwhile, when current limiting switch chip U1 is in open mode, normally provide power supply for USB interface; when the ancillary equipment short circuit being connected with USB interface; then the electric current of switching circuit of power supply is excessive, and current limiting switch chip U1 then can be automatically switched off, thus plays the effect of current-limiting protection.
But there is following defect in above-mentioned power switch circuit: when the ancillary equipment being connected with USB interface is band autonomous power supply system, such as computer, the hard disk etc. that band is powered, when the power cut-off of circuit system, owing to circuit system carries direct-to-ground capacitance, cannot quickly power down, system worked well, the I/O port of circuit system continues to put out high level, current limiting switch chip U1 turns on, the power supply of the ancillary equipment being then connected to USB interface is poured into the circuit system being connected with D/C power by current limiting switch chip U1 is counter due to pressure reduction, circuit system is caused to keep duty, the power supply of the ancillary equipment being then connected with USB interface then can be beyond the load capacity of self, cause the electricity shortage of ancillary equipment.
Utility model content
The purpose of this utility model is to provide a kind of power switch circuit and electric power system, can prevent from counter being poured into USB interface, it is to avoid ancillary equipment electricity shortage.
For solving above technical problem, this utility model embodiment provides a kind of power switch circuit to include: current limiting switch chip and power input interface module；Described current limiting switch chip has the first enable control end for being connected with the I/O port of circuit system, for the switch input terminal being connected with the power supply outfan of described circuit system with for the output switching terminal being connected with the feeder ear of USB interface；Described power input interface module have second enable control end, energization input, for the power supply output and ground being connected with the power input of described circuit system；
First enable of described current limiting switch chip controls end and is connected with the second enable control end of described power input interface module, and the second enable of described power input interface module is controlled end and is connected with the earth terminal of described power input interface module by switching device.
At a kind of embodiment, described switching device is mechanical switch；Described mechanical switch for opening switch when the energization input of described power input interface module is inserted into power supply, and switchs for the Guan Bi when the energization input of described power input interface module is unplugged power supply.
In another embodiment, described switching device is electromagnetic switch, and described electromagnetic switch has control end, the first switch terminals and second switch end；
The end that controls of described electromagnetic switch is connected with the energization input of described power input interface module, first switch terminals of described electromagnetic switch controls end with the second enable of described power input interface module and is connected, and the second switch end of described electromagnetic switch is connected with the earth terminal of described power input interface module.
Further, described power input interface module also includes that connector pin, described connector pin include female end and sub-end；
The energization input of described power input interface module is connected with the female end of described connector pin, and the power supply outfan of described power input interface module is connected with the sub-end of described connector pin.
Further, described power switch circuit also includes diode；
First enable of described current limiting switch chip controls end and is connected with the anode of described diode, and the second enable of described power input interface module controls end and is connected with the negative electrode of described diode.
Further, described current limiting switch chip also has current threshold end, and described power switch circuit also includes the 3rd resistance；
One end of described 3rd resistance is connected with the current threshold end of described current limiting switch chip, and the other end of described 3rd resistance is connected to ground.
Further, described power switch circuit also includes the first resistance and the second resistance；
One end of described first resistance controls end with the first enable of described current limiting switch chip and is connected, and the other end of described first resistance is for being connected with the I/O port of circuit system；One end of described second resistance controls end with the first enable of described current limiting switch chip and is connected, and the other end of described second resistance is connected to ground.
Further, described power switch circuit also includes the first electric capacity, the second electric capacity and the 3rd electric capacity；
One end of described first electric capacity is connected with the switch input terminal of described current limiting switch chip, and the other end of described first electric capacity is connected to ground；Described second electric capacity is connected with the output switching terminal of described current limiting switch chip, and the other end of described second electric capacity is connected to ground；One end of described 3rd electric capacity is connected with the power supply outfan of described power input interface module, and the other end of described 3rd electric capacity is connected to ground.
Correspondingly, this utility model also provides for a kind of electric power system and includes power supply, circuit system, power switch circuit and USB interface；
Described power switch circuit is foregoing power switch circuit；
Described power supply is connected with the energization input of the power input interface module in described power switch circuit, and the power supply outfan of described power input interface module is connected with the power input of described circuit system；The power supply outfan of described circuit system is connected with the switch input terminal of the current limiting switch chip in described power switch circuit, the I/O port of described circuit system controls end with the first enable of described current limiting switch chip and is connected, and the output switching terminal of described current limiting switch chip is connected with the feeder ear of described USB interface.
Preferably, described power supply is D/C power.
Compared to prior art, a kind of power switch circuit of the present utility model has the beneficial effects that with electric power system: the enable of current limiting switch chip controls end and is connected with power supply interface module, and the end that is connected is connected by the earth terminal of switching device with described power input interface module, owing to this power input interface module is the power supply porch of circuit system, the above-mentioned whether disconnection that the most charged direct control switching device that can make power input interface module is set, and then control rapidly to enable the low and high level controlling end, control opening or closing of current limiting switch chip；Then when circuit system does not has charged, i.e. power input interface module is not connected with power supply, then power input interface module controls to enable control end is low level, current limiting switch chip disconnects, thus prevent the current flowing backwards of ancillary equipment that is connected with USB interface in circuit system, it is to avoid the electricity shortage of ancillary equipment.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of power switch circuit of prior art；
Fig. 2 is the structural representation of an embodiment of the power switch circuit that this utility model provides；
Fig. 3 is the structural representation of another embodiment of the power switch circuit that this utility model provides；
Fig. 4 is the structural representation of an embodiment of the electric power system that this utility model provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
Referring to Fig. 2, be the structural representation of an embodiment of the power switch circuit that this utility model provides, this power switch circuit includes: current limiting switch chip 20 and power input interface module 10；Described current limiting switch chip 20 has the first enable control end EN for being connected with the I/O port (I/O-IN) of circuit system, for the switch input terminal IN being connected with the power supply outfan (DC-5V) of described circuit system with for the output switching terminal OUT being connected with the feeder ear of USB interface (USB-5V).The model of the current limiting switch chip 20 used at this utility model has multiple; differ an illustration at this; but the current limiting switch chip 20 used is respectively provided with the effect of current-limiting protection; i.e.; when the electric current that this road electric current of switch input terminal IN to output switching terminal OUT sets more than current threshold end, current limiting switch chip 20 disconnects the path between switch input terminal IN and output switching terminal OUT.
Described power input interface module 10 have second enable control end 13, energization input 11, for the power supply outfan 12 being connected with the power input of described circuit system and earth terminal 14.
First enable of described current limiting switch chip 20 controls end EN and is connected with the second enable control end 13 of described power input interface module 10, as shown in Figure 2, the power input interface module 10 of this utility model circuit is a power interface terminal, for inserting power supply, and this power interface terminal includes a switching device.Second enable of the most above-mentioned power input interface module 10 is controlled end 13 and is connected with the earth terminal 14 of power input interface module 10 by this switching device.
In this utility model, above-mentioned switching device concretely mechanical switch M1 or electromagnetic switch M2, this power switch circuit will be described in detail by the switch of both forms below:
When above-mentioned switching device is mechanical switch M1, as shown in Figure 2, particularly as follows: above-mentioned mechanical switch M1 is for opening switch when the energization input 11 of power input interface module 10 is inserted into power supply, that is, the two ends (13 of the mechanical switch M1 of power input interface module 10, 14) backed down by attaching plug, owing to power switch circuit of the present utility model also includes diode D1 as shown in Figure 2, first enable of current limiting switch chip 20 controls the anode of end EN and diode D1 and is connected, second enable of power input interface module 10 controls end 13 and is connected with the negative electrode of diode D1, now, this diode D1 is then in reverse blocking state, then the most charged of the feeder ear (USB-5V) of USB interface is controlled by the I/O port of circuit system.Described mechanical switch M1 is additionally operable to the Guan Bi switch when the energization input 11 of power input interface module 10 is unplugged power supply, i.e., the two ends (13 of the module switch of power input interface module 10, 14) automatically close, now, diode D1 processes conducting state, then the first enable of current limiting switch chip 20 controls end EN is low level, control current limiting switch chip 20 and disconnect the path of switch input terminal IN and output switching terminal OUT, thus prevent the feeder ear by USB interface of the electric current when the external ancillary equipment (band independent current source) of USB interface, and then pass through the circuit system that the anti-switch input terminal IN being poured into current limiting switch chip 20 of current limiting switch chip 20 is connected, avoid the electricity shortage of this ancillary equipment.
When above-mentioned switching device is electromagnetic switch M2, as it is shown on figure 3, be the structural representation of another embodiment of the power switch circuit that this utility model provides, this electromagnetic switch M2 has control end, the first switch terminals and second switch end；Concrete annexation is: the end that controls of described electromagnetic switch M2 is connected with the energization input 11 of described power input interface module 10, first switch terminals of described electromagnetic switch M2 controls end 13 with the second enable of described power input interface module 10 and is connected, and the second switch end of described electromagnetic switch M2 is connected with the earth terminal 14 of described power input interface module 10.
Further, described power input interface module 10 also includes that connector pin 15, described connector pin 15 include female end 151 and sub-end 152；Concrete annexation is: the energization input 11 of described power input interface module 10 is connected with the female end 151 of described connector pin, and the power supply outfan 12 of described power input interface module 10 is connected with the sub-end 152 of described connector pin.
In the present embodiment, when power input interface module 10 is inserted into power supply, attaching plug promotes the female end 151 of the connector pin 15 of described power input interface module 10, the female end 151 making connector pin is connected with sub-end 152, the most sub-end 152 band electric control electromagnetic switch M2 band magnetic, and magnetic is repelled each other, electromagnetic switch M2 disconnects, now, this diode D1 is then in reverse blocking state, then the most charged of the feeder ear (USB-5V) of USB interface is controlled by the I/O port of circuit system.When power input interface module 10 is unplugged power supply, attaching plug detaches, make connecting contact pin female end 151 and sub-end 152 from, the most sub-end 152 is not charged, electromagnetism is opened without magnetic, electromagnetic switch M2 closes, the second enable making power input interface module 10 controls end 13 and is connected with earth terminal 14, diode D1 turns on, then the first enable of current limiting switch chip 20 controls end EN is low level, control current limiting switch chip 20 and disconnect the path of switch input terminal IN and output switching terminal OUT, thus prevent the feeder ear by USB interface of the electric current when the external ancillary equipment (band independent current source) of USB interface, and then pass through the circuit system that the anti-switch input terminal IN being poured into current limiting switch chip 20 of current limiting switch chip 20 is connected, avoid the electricity shortage of this ancillary equipment.
Further, described current limiting switch chip 20 also has current threshold end ISET, and described power switch circuit also includes the 3rd resistance R3；
One end of described 3rd resistance R3 is connected with the current threshold end ISET of described current limiting switch chip 20, and the other end of described 3rd resistance R3 is connected to ground.
It should be noted that, the threshold value that described current limiting switch chip 20 limits the electric current between its switch input terminal IN and output switching terminal OUT is fixing, different occasions is can be suitably used for for the ease of this chip, this chip is set there is current threshold end ISET, by the external earth resistance of this port, the i.e. size of the threshold value of the limited electric current of this chip of adjustable.
Further, above-mentioned power switch circuit also includes the first resistance R1 and the second resistance R2；
One end of described first resistance R1 controls end EN with the first enable of described current limiting switch chip 20 and is connected, and the other end of described first resistance R1 is for being connected with the I/O port of circuit system；One end of described second resistance R2 controls end EN with the first enable of described current limiting switch chip 20 and is connected, and the other end of described second resistance R2 is connected to ground.
It should be noted that the first resistance R1 and the second resistance R2 plays the effect of current protection, prevent the electric current excessive damage chip of the first enable control chip of current limiting switch chip 20.
Further, described power switch circuit also includes the first electric capacity C1, the second electric capacity C2 and the 3rd electric capacity C3；
One end of described first electric capacity C1 is connected with the switch input terminal IN of described current limiting switch chip 20, and the other end of described first electric capacity C1 is connected to ground；Described second electric capacity C2 is connected with the output switching terminal OUT of described current limiting switch chip 20, and the other end of described second electric capacity C2 is connected to ground；One end of described 3rd electric capacity C3 is connected with the power supply outfan 12 of described power input interface module 10, and the other end of described 3rd electric capacity C3 is connected to ground.Above three electric capacity is all as ground capacity.
The power switch circuit that this utility model provides, the enable of current limiting switch chip controls end and is connected with power supply interface module, and the end that is connected is connected by the earth terminal of switching device with described power input interface module, owing to this power input interface module is the power supply porch of circuit system, the above-mentioned whether disconnection that the most charged direct control switching device that can make power input interface module is set, and then control rapidly to enable the low and high level controlling end, control opening or closing of current limiting switch chip；Then when circuit system does not has charged, i.e. power input interface module is not connected with power supply, then power input interface module controls to enable control end is low level, current limiting switch chip disconnects, thus prevent the current flowing backwards of ancillary equipment that is connected with USB interface in circuit system, it is to avoid the electricity shortage of ancillary equipment.
Correspondingly, see Fig. 4, being the structural representation of an embodiment of the electric power system that this utility model provides, this electric power system employs power switch circuit in above-described embodiment, and this electric power system includes the power switch circuit in power supply 30, circuit system 40, above-described embodiment and USB interface 50；
Concrete annexation is: described power supply 30 is connected with the energization input 11 of the power input interface module 10 in described power switch circuit, and the power supply outfan 12 of described power input interface module 10 is connected with the power input 41 of described circuit system；The power supply outfan DC-5V of described circuit system is connected with the switch input terminal IN of the current limiting switch chip 20 in described power switch circuit, the I/O port I/O-IN of described circuit system controls end EN with the first enable of described current limiting switch chip 20 and is connected, and the output switching terminal OUT of described current limiting switch chip 20 is connected with the feeder ear USB-5V of described USB interface.
Preferably, above-mentioned power supply 30 is D/C power.
The above is preferred implementation of the present utility model; it should be pointed out that, for those skilled in the art, on the premise of without departing from this utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection domain of the present utility model.
Claims (10)
1. a power switch circuit, it is characterised in that including: current limiting switch chip and power input interface module；Described current limiting switch chip has the first enable control end for being connected with the I/O port of circuit system, for the switch input terminal being connected with the power supply outfan of described circuit system with for the output switching terminal being connected with the feeder ear of USB interface；Described power input interface module have second enable control end, energization input, for the power supply output and ground being connected with the power input of described circuit system；
First enable of described current limiting switch chip controls end and is connected with the second enable control end of described power input interface module, and the second enable of described power input interface module is controlled end and is connected with the earth terminal of described power input interface module by switching device.
2. power switch circuit as claimed in claim 1, it is characterised in that described switching device is mechanical switch；Described mechanical switch for opening switch when the energization input of described power input interface module is inserted into power supply, and switchs for the Guan Bi when the energization input of described power input interface module is unplugged power supply.
3. power switch circuit as claimed in claim 1, it is characterised in that described switching device is electromagnetic switch, described electromagnetic switch has control end, the first switch terminals and second switch end；
The end that controls of described electromagnetic switch is connected with the energization input of described power input interface module, first switch terminals of described electromagnetic switch controls end with the second enable of described power input interface module and is connected, and the second switch end of described electromagnetic switch is connected with the earth terminal of described power input interface module.
4. power switch circuit as claimed in claim 3, it is characterised in that described power input interface module also includes that connector pin, described connector pin include female end and sub-end；
The energization input of described power input interface module is connected with the female end of described connector pin, and the power supply outfan of described power input interface module is connected with the sub-end of described connector pin.
5. the power switch circuit as described in any one of Claims 1-4, it is characterised in that described power switch circuit also includes diode；
First enable of described current limiting switch chip controls end and is connected with the anode of described diode, and the second enable of described power input interface module controls end and is connected with the negative electrode of described diode.
6. power switch circuit as claimed in claim 5, it is characterised in that described current limiting switch chip also has current threshold end, and described power switch circuit also includes the 3rd resistance；
One end of described 3rd resistance is connected with the current threshold end of described current limiting switch chip, and the other end of described 3rd resistance is connected to ground.
7. power switch circuit as claimed in claim 6, it is characterised in that described power switch circuit also includes the first resistance and the second resistance；
One end of described first resistance controls end with the first enable of described current limiting switch chip and is connected, and the other end of described first resistance is for being connected with the I/O port of circuit system；One end of described second resistance controls end with the first enable of described current limiting switch chip and is connected, and the other end of described second resistance is connected to ground.
8. power switch circuit as claimed in claim 7, it is characterised in that described power switch circuit also includes the first electric capacity, the second electric capacity and the 3rd electric capacity；
One end of described first electric capacity is connected with the switch input terminal of described current limiting switch chip, and the other end of described first electric capacity is connected to ground；Described second electric capacity is connected with the output switching terminal of described current limiting switch chip, and the other end of described second electric capacity is connected to ground；One end of described 3rd electric capacity is connected with the power supply outfan of described power input interface module, and the other end of described 3rd electric capacity is connected to ground.
9. an electric power system, it is characterised in that described electric power system includes power supply, circuit system, power switch circuit and USB interface；
Described power switch circuit is the power switch circuit described in any one of claim 1 to 8；
Described power supply is connected with the energization input of the power input interface module in described power switch circuit, and the power supply outfan of described power input interface module is connected with the power input of described circuit system；The power supply outfan of described circuit system is connected with the switch input terminal of the current limiting switch chip in described power switch circuit, the I/O port of described circuit system controls end with the first enable of described current limiting switch chip and is connected, and the output switching terminal of described current limiting switch chip is connected with the feeder ear of described USB interface.
10. electric power system as claimed in claim 9, it is characterised in that described power supply is D/C power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620114450.8U CN205584004U (en) | 2016-02-04 | 2016-02-04 | Power supply switch circuit and power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620114450.8U CN205584004U (en) | 2016-02-04 | 2016-02-04 | Power supply switch circuit and power supply system |
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| CN205584004U true CN205584004U (en) | 2016-09-14 |
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| CN201620114450.8U Active CN205584004U (en) | 2016-02-04 | 2016-02-04 | Power supply switch circuit and power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356804A (en) * | 2016-11-07 | 2017-01-25 | 福建实达电脑设备有限公司 | Module with short circuit protection function for serial port and method |
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2016
- 2016-02-04 CN CN201620114450.8U patent/CN205584004U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356804A (en) * | 2016-11-07 | 2017-01-25 | 福建实达电脑设备有限公司 | Module with short circuit protection function for serial port and method |
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