CN207926260U - A kind of multiple-way supply automatic switch-over circuit and supply unit - Google Patents
A kind of multiple-way supply automatic switch-over circuit and supply unit Download PDFInfo
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- CN207926260U CN207926260U CN201820036894.3U CN201820036894U CN207926260U CN 207926260 U CN207926260 U CN 207926260U CN 201820036894 U CN201820036894 U CN 201820036894U CN 207926260 U CN207926260 U CN 207926260U
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- 102100030393 G-patch domain and KOW motifs-containing protein Human genes 0.000 description 9
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Abstract
The utility model is related to a kind of multiple-way supply automatic switch-over circuit, a kind of multiple-way supply automatic switch-over circuit, including N supplying channels, wherein N is the positive integer more than 1；Every supplying channels include one with the first terminals, the second terminals and third terminals transistor and be connected to the resistance of the first terminals of the transistor, also, i-th supplying channels further includes 1 diode of i for being connected to the PMOS grids；Wherein, i is positive integer, and 1 ＜ i≤N；The transistor is PMOS tube or PNP triode；First terminals are the grid of the PMOS tube or the base stage of the PNP triode；Second terminals are the drain electrode of the PMOS tube or the collector of the PNP triode；The third terminals are the source electrode of the PMOS tube or the emitter of the PNP triode.
Description
Technical field
The utility model is related to field of power electronics, and in particular to a kind of multiple-way supply automatic switch-over circuit.
Background technology
With the development of science and technology, power electronic technique develops rapidly, only it has been difficult full by traditional single service mode
The requirements at the higher level that the power equipment to emerge one after another enough proposes power supply system, it is single especially when power-supply system breaks down
The abnormal electrical power supply of road power supply can lead to the paralysis of entire load system, result even in serious security risk and huge economy
Loss, for example, in space flight military industry field, industrial control field or medical field etc..
In order to improve the safety of power supply system, multiple-way supply mode is come into being.Under normal conditions, multiple-way feed system
With multiple supplying channels, at work, one of channel is on power supply state, and rest channels are in stand-by state,
Once exception occur in supplying channels, alternate channel can be switched to and continue to power, entire load system is continued to realize
Power supply, it can be seen that, for multiple-way supply mode, the performance of switching circuit will directly affect using and pacifying for power supply system
Entirely, but multiple-way supply switching circuit in the prior art only considered and how effectively to switch mostly, and lack to different power supplies
Power supply type targetedly automatically switches, and which limits the applications of multiple-way supply.
Therefore, the multiple-way supply automatic switch-over circuit that a kind of flexibility is good and stability is high is needed at present.
Invention content
The utility model provides a kind of multiple-way supply automatic switch-over circuit, including N supplying channels, wherein N be more than
1 positive integer；Every supplying channels include a crystal with the first terminals, the second terminals and third terminals
The resistance of the first terminals of the transistor is managed and is connected to, also, i-th supplying channels further includes being connected to PMOS
I-1 diode of grid；
Wherein, i is positive integer, and 1 ＜ i≤N；The transistor is PMOS tube or PNP triode；First terminals
It is the grid of the PMOS tube or the base stage of the PNP triode；Second terminals are drain electrode or the institute of the PMOS tube
State the collector of PNP triode；The third terminals are the source electrode of the PMOS tube or the emitter of the PNP triode.
Preferably, the power supply VINi of i-th supplying channels is connected to the crystalline substance of i-th supplying channels
The third terminals of body pipe, the power supply of the power supply VIN1 of first supplying channels to (i-1)-th supplying channels
Power supply VINi-1 is connected to the first terminals of the transistor in this channel through a diode respectively.
Preferably, the power supply VIN1 of first supplying channels is also attached to the institute of first supplying channels
State the third terminals of transistor.
Preferably, the power supply voltage of the N supplying channels is identical, is VIN.
Preferably, the thresholding cut-in voltage V of the transistorTHMeet：VTH＞-VIN.
Preferably, when the VIN is 5V, the value range of the resistance is 1 kilo-ohm~100 kilo-ohms.
Preferably, every supplying channels further include two poles for being connected to the second terminals of transistor described in this channel
Pipe.
Preferably, the switching circuit further includes storage capacitor, and the second terminals of the transistor are described through being connected to
The diode of second terminals is connected to the storage capacitor.
Preferably, the power supply of the supplying channels is 5V, when maximum through-current capacity demand is 2A, the storage capacitor
Capacitance range is 100 microfarads or more, and pressure resistance is 10V or more.
Other side according to the present utility model also provides a kind of supply unit, including multiple-way supply as described above
Automatic switch-over circuit and the N number of power supply for being connected to the N supplying channels.
Multiple-way supply automatic switch-over circuit provided by the utility model, by for multiple-way supply channel allocation priority it is suitable
Sequence, and the automatic switchover in order of the switching switch realization multiple-way supply power supply using multiplexer channel, improve multiple-way supply
Flexibility；Storage capacitor using one way conducting device and for assisting switching, ensure that handover security and seamless switching, improve
The stability of multiple-way supply；In particular, whole switching circuit is built only with hardware, without using software auxiliary or
Manual hand manipulation achieves that automatic switchover, not only highly practical, realization method is simple but also cost is relatively low.
Description of the drawings
Fig. 1 is the duplex feeding automatic switch-over circuit structural schematic diagram of the utility model preferred embodiment.
Fig. 2 is the three tunnels power supply automatic switch-over circuit structural schematic diagram of the utility model preferred embodiment.
Fig. 3 is the multiple-way supply automatic switch-over circuit structural schematic diagram of the utility model preferred embodiment.
Fig. 4 is the structural schematic diagram of the automatic switchover power supply unit of the utility model preferred embodiment
Fig. 5 is the binary channels switching circuit structural schematic diagram of another embodiment of the utility model.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, pass through tool below in conjunction with attached drawing
The utility model is further described in body embodiment.
Fig. 1 is the signal of the power supply automatic switch-over circuit including duplex feeding channel of the utility model preferred embodiment
Figure, as shown in Figure 1, the switching circuit includes the first supplying channels, the second supplying channels and storage capacitor C1.
Wherein, the first supplying channels include the pmos fet MOS1 switched for channel, for the electricity of current limliting
Resistance R1 and prevent the Schottky-barrier diode D1 that electric current pours in down a chimney between channel.Wherein, the anode of D1 is connected to the leakage of MOS1
The cathode of pole (D), D1 is connected to load supplying (VOUT)；Current-limiting resistance R1 is connected to the grid (G) of MOS1 and is grounded；First
The power supply VIN1 in channel is connected to the source electrode (S) of MOS1, and capacitance C1 is connected to the cathode of D1 and ground connection, is leaked using MOS1
The output power supply and the charging to capacitance C1 that on or off between pole (D) and source electrode (S) realizes VIN1.
Second supplying channels are similar to the first supplying channels in structure, equally include the fields the PMOS effect switched for channel
Answer transistor MOS2, for current limliting resistance R2 and prevent the Schottky-barrier diode D22 that electric current pours in down a chimney between channel,
In, the anode of D22 is connected to the drain electrode of MOS2 (D), and the cathode of D22 is connected to load supplying (VOUT)；Current-limiting resistance R2 connections
In MOS2 grid (G) and be grounded.Difference lies in the power supply VIN2 of second channel is connected to the first supplying channels
The power supply VIN1 of the source electrode (S) of MOS2, first passage is connected to MOS2 grids (G) by diode D21.In addition, capacitance
C1 is equally also connected to cathode and the ground connection of D22, is realized using the on or off between MOS1 drain electrodes (D) and source electrode (S)
The switching of VIN1 and VIN2 output power supplies and the switching to capacitance C1 chargings.
According to the principle of PMOSFET it is found that its on or off for draining between (D) and source electrode (S) can by grid (G) and
Voltage difference V between source electrode (S)GSIt determines, it is assumed that the thresholding cut-in voltage of PMOSFET is VTH, then have VGS＜ VTHWhen,
PMOSFET is connected, on the contrary then turn off.
First passage power supply VIN1 and second channel power supply VIN2 are connected to the finger of above-mentioned switching circuit
Determine device respective end, wherein VIN1=VIN2, and VTH＞-VIN1, by above-mentioned principle it is found that under normal circumstances, can there is MOS1's
VGS1The V of=- VIN1, MOS2GS2It is 0 or be that just, i.e. MOS1 conductings, MOS2 is disconnected, first passage power supply VIN1 at this time
For load supplying, and it is capacitance C1 chargings；If the power supply VIN1 of first passage, which is abnormal, to power, there is MOS2's
VGS2=-VIN2 makes MOS2 be connected, i.e., switching circuit will automatically switch to second channel, is using second channel power supply
Load supplying；If the power supply VIN1 of first passage restores normal, there is the V of MOS1GS1The V of=- VIN1, MOS2GS2It is 0
Or just, MOS1 to be made to be connected, MOS2 is disconnected, i.e., switching circuit will automatically switch back into first passage, be powered using first passage
Power supply is load supplying；Meanwhile in handoff procedure, using storage capacitor C1 electric discharges to avoid in power supply caused by handoff delay
It is disconnected.
It follows that using switching circuit provided by the utility model, may be implemented between duplex feeding channel according to
The autonomous switching of sequence.
In one embodiment of the utility model, the thresholding cut-in voltage V of above-mentioned PMOSTHWith
The difference of VIN is bigger, and the conducting resistance of the PMOS is smaller, in addition, in order to ensure through-current capacity demand and PMOS
Stability when stating the PMOS used in switching circuit in the choice, should also make the V of PMOSGSAnd VdsMaximum value be more than
The power supply VIN that supplying channels are connected.
In another embodiment of the utility model, the selection of above-mentioned current-limiting resistance can be according to encapsulation situation or power supply
Size selection, for example, when power supply is 5V, resistance is encapsulated as 0603, the choosing value range of resistance can be 1 kilo-ohm~
100 kilo-ohms.
In another embodiment of the utility model, the selection of above-mentioned storage capacitor C1 can be according to the through-current capacity of power supply system
It is selected with the size of power supply, for example, when power supply is 5V, maximum through-current capacity demand is 2A, storage capacitor C1's
Choosing value range can be 100 microfarads or more, resistance to be pressed in 10V or more.
In another embodiment of the utility model, above-mentioned switching circuit may also include third supplying channels.Fig. 2 is this reality
It is powered automatic switch-over circuit structural schematic diagram with three tunnels of novel preferred embodiment, as shown in Fig. 2, its first, second power supply is logical
Road is identical with the first, second supplying channels of Fig. 1, and third supplying channels are similar with the first, second supplying channels structure,
Include the MOS3 switched for channel, for current limliting resistance R3 and prevent the D33 that electric current pours in down a chimney between channel, wherein
The anode of D33 is connected to the drain electrode (D) of MOS3, and the cathode of D33 is connected to load supplying (VOUT)；Current-limiting resistance R3 is connected to
The grid (G) of MOS3 is simultaneously grounded.Difference lies in the power supply VIN3 of third channel connects with the first, second supplying channels for it
It is connected to the source electrode (S) of MOS3, the power supply VIN1 of first passage is connected to MOS3 grids (G) by diode D31；Second is logical
The power supply VIN2 in road is connected to MOS3 grids (G) by diode D32.In addition, capacitance C1 is equally also connected to D33's
Cathode is simultaneously grounded, and VIN1, VIN2 and VIN3 output are realized using the on or off between MOS3 drain electrodes (D) and source electrode (S)
The switching of power supply and the switching charged to capacitance C1.
Handoff procedure between VIN1 and VIN2 is similar, it is known that VIN1=VIN2=VIN3, utilize above-mentioned switching electricity
Road may be implemented, when VIN1 and VIN2 can not power, to automatically switch to third supplying channels, be powered using VIN3, from
And realize from first to the automatic switchover between third supplying channels sequentially, i.e. the first supplying channels are supplied prior to second
Electric channel, the second supplying channels are prior to third supplying channels.
As described above, it will be understood by those skilled in the art that above-mentioned switching circuit may also include more
The supplying channels similar with above-mentioned third supplying channels, and realized using the circuit structure of similar Article 3 supplying channels mostly logical
The switching in order in road.For example, Fig. 3 is the multiple-way supply automatic switch-over circuit structural representation of the utility model preferred embodiment
Figure, it is positive integer more than 1 which, which has N supplying channels, N, then have i-th supplying channels (wherein, 1 ＜ i≤
N, and i is positive integer) include the MOSi switched for channel, electric current pours in down a chimney for the resistance Ri of current limliting and between preventing channel
Dii.Meanwhile the power supply VINi of i-th supplying channels is connected to the source electrode (S) of MOSi, the power supply of first passage
The power supply VINi-1 of VIN1 to (i-1)-th supplying channels is connected to MOSi grids by diode Di1 to Di-1 respectively
(G).In addition, capacitance C1 is equally also connected to the cathode of Dii, using between MOSi drain electrodes (D) and source electrode (S) conducting or
VIN1 to VINi outputs power supply and the sequentially switching to capacitance C1 chargings are realized in shutdown, wherein this i-th power supply is logical
The transfer sequence priority P in roadiIt can meet： Pi-1＞ Pi＞ Pi+1。
One side according to the present utility model can also provide a kind of power supply unit including above-mentioned switching circuit, example
Such as, Fig. 4 is the structural schematic diagram of the automatic switchover power supply unit of the utility model preferred embodiment, as shown in figure 4, the equipment packet
It includes triple channel power supply automatic switch-over circuit as shown in Figure 2 and is connected to the power supply module 1 of the switching circuit, the also company of being useful for
The indicator light for connecing the business interface of load, being used to indicate business interface connection；Wherein, power supply module 1 includes being separately connected
In three power supplies of supplying channels power1, power2 and power3, supplying channels power1 corresponds to switching shown in Fig. 2
The first passage of circuit, supplying channels power2 correspond to the second channel of switching circuit shown in Fig. 2, power3 pairs of supplying channels
The third channel of switching circuit shown in Fig. 2, it may thus be appreciated that the priority of above three supplying channels be power1 prior to
Power2, power2 are prior to power3.
When above-mentioned power supply unit works, switching circuit selects the power supply being connect with power1 to power first, at this
When power supply is abnormal power down, using above-mentioned switching circuit automatically switch to power2 power supply, with power1 and power2
Connection two power supplies simultaneously powered-off fault when, can switch to power3 and be powered, to realize with power1,
Switching in order between three power supplies of power2 and power3 connections.
Although in the above-described embodiments, using PMOSFET to carry out switching circuit structure provided by the utility model
Illustrate, but it will be recognized by one of ordinary skill in the art that in other embodiments, above-mentioned PMOSFET may be replaced by other open
Close device, and can be according to the connection type of the conducting principle of switching device adaptably adjustment circuit, for example, as shown in Figure 5
For binary channels switching circuit using PNP triode as switching device, the switching circuit is similar to circuit shown in FIG. 1, main
It will difference lies in used PNP triode instead of the metal-oxide-semiconductor in Fig. 1, according to the conducting principle of PNP triode, using PNP tri-
The switching circuit of pole pipe can also realize the automatic switchover in order of the first supplying channels and the second supplying channels.
Although the utility model has been described by means of preferred embodiments, the utility model is not limited to this
In described embodiment, further include made various changes and change in the case where not departing from the scope of the utility model
Change.
Claims (10)
1. a kind of multiple-way supply automatic switch-over circuit, including N supplying channels, wherein N is the positive integer more than 1；It is every described
Supplying channels include one with the first terminals, the second terminals and third terminals transistor and be connected to the crystalline substance
The resistance of the first terminals of body pipe, also, i-th supplying channels further includes i-1 diode for being connected to PMOS grids；
Wherein, i is positive integer, and 1 ＜ i≤N；The transistor is PMOS tube or PNP triode；First terminals are institutes
State the grid of PMOS tube or the base stage of the PNP triode；Second terminals are the drain electrode of the PMOS tube or the PNP
The collector of triode；The third terminals are the source electrode of the PMOS tube or the emitter of the PNP triode.
2. switching circuit according to claim 1, which is characterized in that the power supply VINi of i-th supplying channels
It is connected to the third terminals of the transistor of i-th supplying channels, the power supply of first supplying channels
The power supply VINi-1 of VIN1 to (i-1)-th supplying channels is connected to this channel through a diode respectively
First terminals of the transistor.
3. switching circuit according to claim 2, which is characterized in that the power supply VIN1 of first supplying channels
It is also attached to the third terminals of the transistor of first supplying channels.
4. switching circuit according to claim 3, which is characterized in that the power supply voltage phase of the N supplying channels
Together, it is VIN.
5. switching circuit according to claim 4, which is characterized in that the thresholding cut-in voltage V of the transistorTHMeet：
VTH＞-VIN.
6. switching circuit according to claim 4, which is characterized in that when the VIN is 5V, the value range of the resistance
It is 1 kilo-ohm~100 kilo-ohms.
7. switching circuit according to claim 1, which is characterized in that every supplying channels further include being connected to this
The diode of the second terminals of transistor described in channel.
8. switching circuit according to claim 7, which is characterized in that the switching circuit further includes storage capacitor, described
Second terminals of transistor are connected to the storage capacitor through being connected to the diode of second terminals.
9. switching circuit according to claim 8, which is characterized in that the power supply of the supplying channels is 5V, maximum
When through-current capacity demand is 2A, the capacitance range of the storage capacitor is 100 microfarads or more, and pressure resistance is 10V or more.
10. a kind of supply unit, including multiple-way supply automatic switch-over circuit as described in any one of claim 1 to 9 and point
It is not connected to N number of power supply of the N supplying channels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820036894.3U CN207926260U (en) | 2018-01-10 | 2018-01-10 | A kind of multiple-way supply automatic switch-over circuit and supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820036894.3U CN207926260U (en) | 2018-01-10 | 2018-01-10 | A kind of multiple-way supply automatic switch-over circuit and supply unit |
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| CN207926260U true CN207926260U (en) | 2018-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112542829A (en) * | 2020-11-16 | 2021-03-23 | 科大讯飞股份有限公司 | Multi-path power supply management method and multi-path power supply device applied to electronic equipment |
-
2018
- 2018-01-10 CN CN201820036894.3U patent/CN207926260U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112542829A (en) * | 2020-11-16 | 2021-03-23 | 科大讯飞股份有限公司 | Multi-path power supply management method and multi-path power supply device applied to electronic equipment |
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