CN106026633A - Power converter - Google Patents
Power converter Download PDFInfo
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- CN106026633A CN106026633A CN201610559791.0A CN201610559791A CN106026633A CN 106026633 A CN106026633 A CN 106026633A CN 201610559791 A CN201610559791 A CN 201610559791A CN 106026633 A CN106026633 A CN 106026633A
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- Prior art keywords
- resistance
- circuit
- comparison circuit
- detecting
- electrical connected
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a power converter comprising an output end, a detection circuit, a reference value generation circuit, and a comparison circuit. The detection circuit is electrically connected with the comparison circuit and a load, and is used for detecting the current of the load, converting the detected current of the load into a voltage signal and sending the voltage signal to the comparison circuit. The reference value generation circuit is electrically connected with the comparison circuit, and is used for generating a reference voltage and sending the generated reference voltage to the comparison circuit. The comparison circuit is electrically connected with the output end, and is used for comparing the voltage signal provided by the detection circuit with the reference voltage provided by the reference value generation circuit and outputting a corresponding level signal according to the comparison result. The power converter of the invention has a simple structure. With the power converted, the conversion efficiency is improved, the EMI noise is reduced, and the cost is reduced greatly.
Description
Technical field
The present invention relates to power converter topology field, particularly to a kind of power supply changeover device.
Background technology
Switching Power Supply is that a kind of duty cycle of switching by control switching device adjusts output voltage size
Device, be widely used in each class of electronic devices such as intelligent terminal.Booster type (Boost) converts
Device is a kind of common topological structure of Switching Power Supply.Boost is as basic DC-DC
(DC/DC) one of changer, it is possible to realize transforming to high-voltage power supply from LVPS, and
Have that volume is little, simple in construction, conversion efficiency advantages of higher, thus be widely used, especially
It is to use battery to power, but target voltage is higher than the occasion of supply voltage.
Fig. 1 is the circuit diagram of existing a kind of Boost, as it is shown in figure 1, Boost becomes
Parallel operation includes suitching type booster circuit 110, pulse-width modulation circuit 120 and load 130.Suitching type boosts
Circuit 110 includes inductance L1, diode D, electric capacity C, transistor T.Pulse-width modulation circuit 120
For exporting the pulse-width signal of certain dutycycle, to drive the crystalline substance in suitching type booster circuit 110
The on or off of body pipe T.When transistor T turns on, diode D presents reverse biased, from
The electric energy of input voltage vin is stored in inductance L1, and now the electric energy of load 130 is provided by electric capacity C.
When transistor T ends, diode D presents forward bias voltage drop, now electric capacity C and load 130 suction
The electric energy provided by input voltage vin and inductance L1 is provided, and obtains higher than input voltage with this
Output voltage, thus reach the purpose of boosting.
But above-mentioned Boost is because being to realize transforming to high voltage from low-voltage, can be at transistor T
The switching efficiency that upper consumption is the most unnecessary, hence in so that the input power loss of entirety improves, and leads
The conversion efficiency causing Boost reduces, and above-mentioned Boost is unstable, EMI noise
The biggest, additionally, above-mentioned Boost can not provide boosting, two kinds of switching modes of blood pressure lowering simultaneously.
Therefore design one can improve conversion efficiency, reduce EMI noise, provide voltage in several modes direct current/
DC power converter is the most necessary.
Summary of the invention
The present invention provides a kind of power supply changeover device, simple in construction, it is possible to increase conversion efficiency, reduction EMI
Noise, and cost can be greatly reduced.
Described technical scheme is as follows:
Embodiments provide a kind of power supply changeover device, comprising: outfan, circuit for detecting,
Reference value produces circuit, comparison circuit, wherein, described circuit for detecting, with described comparison circuit, negative
Load is electrical connected, for detecting the electric current of described load, and by the electric current conversion of the described load of detecting
For being supplied to described comparison circuit after voltage signal；Described reference value produce circuit, with described compare electric
Road is electrical connected, and is used for producing reference voltage, and it is electric that the reference voltage of generation is supplied to described comparison
Road；Described comparison circuit, is electrical connected with described outfan, for provided by described circuit for detecting
The reference voltage that voltage signal and described reference value produce circuit and provide compares, and according to comparing knot
Fruit exports corresponding level signal.
In one embodiment of the invention, described circuit for detecting includes the first resistance, described first electricity
One end of resistance is electrical connected with the input of described load and described circuit for detecting, described first resistance
Other end ground connection.
In one embodiment of the invention, described circuit for detecting includes amplifying circuit, described amplification electricity
Road is electrical connected with described comparison circuit, is supplied to described comparison circuit after being amplified by voltage signal.
In one embodiment of the invention, described amplifying circuit include the second resistance, the 3rd resistance,
Amplifier, the positive input of described amplifier is electrical connected with described load, described amplifier anti-
To input by described second resistance eutral grounding, defeated also by described 3rd resistance and described amplifier
Go out end to be electrical connected.
In one embodiment of the invention, described reference value produce circuit include the 4th resistance, the 5th
Resistance, the 6th resistance, the 7th resistance, the 8th resistance and manostat, the first termination of described manostat
Ground, the second end of described manostat produces the input of circuit by described 8th resistance and described reference value
End is electrical connected, and the common port of described manostat passes through described 7th resistance eutral grounding, described 6th resistance
Be connected between the second end and the common port of described manostat, one end of described 4th resistance with described surely
Second end of depressor is electrical connected, and the other end of described 4th resistance passes through described 5th resistance eutral grounding,
The other end of described 4th resistance is also electrical connected with described comparison circuit.
In one embodiment of the invention, described comparison circuit include the 9th resistance, the tenth resistance,
11st resistance, comparator；The positive input of described comparator passes through described tenth resistance with described
Reference value produce circuit be electrical connected, the reverse input end of described comparator by described 9th resistance with
Described circuit for detecting is electrical connected, and the outfan of described comparator passes through described 11st resistance with described
Outfan is connected.
In one embodiment of the invention, described comparison circuit also includes stabilivolt, described stabilivolt
Negative electrode be electrical connected with described outfan, the plus earth of described stabilivolt.
The technical scheme that the embodiment of the present invention provides has the benefit that
By the electric current of circuit for detecting detecting load, and the electric current of the load of detecting is converted to voltage letter
Comparison circuit it is supplied to after number；Reference value produces circuit and produces reference voltage, and the reference electricity that will produce
Pressure is supplied to comparison circuit；The voltage signal that circuit for detecting is provided by comparison circuit produces electricity with reference value
The reference voltage that road provides compares, and exports corresponding level signal according to comparative result.Thus
Plurality of level signal, and simple in construction can be exported, additionally it is possible to improve conversion efficiency, reduce EMI
Noise, and cost can be greatly reduced.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the present invention's
Technological means, and can being practiced according to the content of description, and in order to allow the above-mentioned of the present invention and
Other objects, features and advantages can become apparent, and below especially exemplified by preferred embodiment, and coordinates attached
Figure, describes in detail as follows.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of existing a kind of Boost；
Fig. 2 is the structured flowchart of the power supply changeover device that first embodiment of the invention provides；
Fig. 3 is the structured flowchart of the power supply changeover device that second embodiment of the invention provides；
Fig. 4 is the circuit diagram of the power supply changeover device that third embodiment of the invention provides.
Detailed description of the invention
By further illustrating the technological means and merit that the present invention taked by reaching predetermined goal of the invention
Effect, below in conjunction with accompanying drawing and preferred embodiment, to the power supply changeover device proposed according to the present invention, it is concrete
Embodiment, structure, feature and effect, after describing in detail such as.
For the present invention aforementioned and other technology contents, feature and effect, coordinate with reference to figure following
The preferred embodiment of formula can clearly present in describing in detail.By the explanation of detailed description of the invention,
When the technological means can taked the present invention by reaching predetermined purpose and effect are able to more deeply and tool
The understanding of body, but institute's accompanying drawings is only to provide reference and purposes of discussion, is not used for adding the present invention
To limit.
First embodiment
Fig. 2 is the structured flowchart of the power supply changeover device that first embodiment of the invention provides.Described power supply turns
Parallel operation simple in construction, it is possible to increase conversion efficiency, reduction EMI noise, and can greatly reduce
Cost.Refer to Fig. 2, the power supply changeover device of the present embodiment includes: output end vo ut, circuit for detecting
10, reference value produces circuit 11, comparison circuit 12.
Specifically, circuit for detecting 10,9 it is electrical connected with comparison circuit 12, load, is used for detecting negative
Carry the electric current of 9, and be supplied to comparison circuit after the electric current of the load 9 of detecting is converted to voltage signal
12。
Wherein, circuit for detecting 10 is supplied to comparison circuit 12 after being additionally operable to amplify voltage signal.This is main
Voltage signal to be applicable to is smaller, and needs after amplifying to obtain the application of bigger voltage signal
Occasion, to facilitate follow-up comparison circuit 12 to compare the voltage signal after amplifying, improves and compares effect
Rate.Preferably, load 9 can also be connected with a Boost.Thus the electricity of the embodiment of the present invention
Source converter can realize the output frequency of automatic switchover Boost.If the band of Boost
Loading capability is A, then can be set as the electric current ＜ 1/2A of load, and the voltage signal i.e. loaded is less than
One reference voltage (such as reference voltage can be produced circuit 11 by reference value provides), then Boost conversion
Device switches to high frequency output, i.e. the outfan output high-frequency signal of power supply changeover device；As load current ＞
1/2A, the voltage signal i.e. loaded is more than a reference voltage, then Boost switches to low frequency to export,
The i.e. outfan output low frequency signal of power supply changeover device, wherein Boost can be arbitrary circuit
Type.Certainly, in other embodiments of the present invention, load 9 can also be connected with a power output end,
Thus the power supply changeover device of the embodiment of the present invention can realize the output level of auto switching electric source outfan
The size of signal.
Reference value produces circuit 11, is electrical connected with comparison circuit 12, is used for producing reference voltage, and
The reference voltage of generation is supplied to comparison circuit 12.
Comparison circuit 12, with circuit for detecting 10, that reference value produces circuit 11, output end vo ut is electrical
It is connected, produces, with reference value, the ginseng that circuit 11 provides for the voltage signal provided by circuit for detecting 10
Examine voltage to compare, and export corresponding level signal according to comparative result.
Specifically, draw when voltage signal is more than reference voltage if comparison circuit 12 is additionally operable to compare, then
Output high level signal, draws when voltage signal is less than reference voltage if comparing, then output low level letter
Number.
Wherein, export high level signal and low level signal by comparison circuit 12, so that power supply turns
Parallel operation can provide the mode of two kinds of output voltages, and high level signal can corresponding high-frequency signal, low
Level can corresponding low frequency signal, because output high-frequency signal can promote response time, reduce output electricity
The ripple of pressure, output low frequency signal can reduce EMI noise, and conversion efficiency is higher compared with high frequency,
So that the embodiment of the present invention can not only provide two kinds of mode signal outputs, and also can improve
Conversion efficiency, reduction EMI noise.
In sum, the power supply changeover device that the embodiment of the present invention provides, by circuit for detecting detecting load
Electric current, and be supplied to comparison circuit after the electric current of the load of detecting is converted to voltage signal；Reference
Value produces circuit and produces reference voltage, and the reference voltage of generation is supplied to comparison circuit；The most electric
The reference voltage that the voltage signal that circuit for detecting is provided by road and reference value produce circuit and provide compares
Relatively, and according to comparative result corresponding level signal is exported.Such that it is able to output plurality of level signal,
And simple in construction, additionally it is possible to improve conversion efficiency, reduce EMI noise, and can greatly drop
Low cost.
Second embodiment
Fig. 3 is the structured flowchart of the power supply changeover device that second embodiment of the invention provides.Refer to Fig. 3,
Wherein, Fig. 3 improves on the basis of Fig. 2.The difference of Fig. 3 with Fig. 2 is, Fig. 3
Power supply changeover device in circuit for detecting 10 can include amplifying circuit 13.
Specifically, amplifying circuit 13, it is electrical connected with comparison circuit 12, for voltage signal is amplified
After be supplied to comparison circuit 12.It is smaller that this is primarily adapted for use in voltage signal, and needs after amplifying
To obtain the application scenario of bigger voltage signal, to facilitate follow-up comparison circuit 12 to the voltage after amplifying
Signal compares, and improves relative efficiency.Preferably, comparison circuit 12 is for by amplifying circuit 13
The reference voltage that voltage signal after the amplification provided and reference value produce circuit 11 and provide compares,
And export corresponding level signal according to comparative result.Wherein, if comparison circuit 12 is additionally operable to compare
When going out the voltage signal after amplifying more than reference voltage, then export high level signal, draw put if comparing
When voltage signal after great is less than reference voltage, then output low level signal.Wherein, by the most electric
Road 12 exports high level signal and low level signal, so that power supply changeover device can provide two kinds of outputs
The mode of voltage, and high level signal can corresponding high-frequency signal, low level can corresponding low frequency signal,
Because output high-frequency signal can promote response time, reduce the ripple of output voltage, output low frequency signal
EMI noise can be reduced, and conversion efficiency is higher compared with high frequency, so that the embodiment of the present invention
Two kinds of mode signal outputs can not only be provided, and also conversion efficiency can be improved, reduce EMI and make an uproar
Sound.
In sum, the power supply changeover device that the embodiment of the present invention provides, also by amplifying circuit 13 to electricity
Pressure signal is supplied to comparison circuit 12 after being amplified, thus after facilitating follow-up comparison circuit 12 to amplifying
Voltage signal compare, improve relative efficiency.
3rd embodiment
Fig. 4 is the circuit diagram of the power supply changeover device that third embodiment of the invention provides.Refer to Fig. 4, its
In, Fig. 4 improves on the basis of Fig. 3.The difference of Fig. 4 with Fig. 3 is, Fig. 4 is
A kind of circuit diagram of the concrete implementation present inventive concept of Fig. 3.
Specifically, circuit for detecting 10 includes the first resistance Rs, one end of the first resistance Rs and load 9
And the input of circuit for detecting 10 is electrical connected, the other end ground connection of the first resistance Rs.
Wherein, the node between the first resistance Rs and load 9 can provide voltage signal Vs1.
Amplifying circuit 13 includes the second resistance R1, the 3rd resistance R2, amplifier OP1, amplifier OP1
Positive input 9 be electrical connected with load, the reverse input end of amplifier OP1 passes through the second resistance
R1 ground connection, the outfan Vs also by the 3rd resistance R2 and amplifier OP1 is electrical connected.
Wherein, the first resistance Rs is current sampling resistor, owing to the resistance value of the first resistance Rs is usual
Smaller, so the voltage signal Vs1 ratio obtained is relatively low, therefore to be exported through amplifying circuit 13
The voltage signal of end Vs output, to facilitate follow-up comparison circuit 12 to carry out the voltage signal after amplifying
Relatively, it is provided that relative efficiency.Specifically, the amplifier OP1 in amplifying circuit 13 is by voltage signal
Vs1 is supplied to comparison circuit 12, the second resistance R1 and the 3rd resistance R2 by outfan Vs after amplifying
Determine the gain of amplifier OP1.
Reference value produce circuit 11 include the 4th resistance R3, the 5th resistance R4, the 6th resistance R5, the
Seven resistance R6, the 8th resistance R7 and manostat D1, the most described manostat D1 can be that three ends are steady
Depressor.Wherein, the first end ground connection of manostat D1, second end of manostat D1 passes through the 8th resistance
The input Input that R7 produces circuit 11 with reference value is electrical connected, and the common port of manostat D1 leads to
Cross the 7th resistance R6 ground connection.6th resistance R5 be connected to second end of manostat D1 and common port it
Between.One end of 4th resistance R3 is electrical connected with second end of manostat D1, the 4th resistance R3's
The other end passes through the 5th resistance R4 ground connection, and the other end of the 4th resistance R3 is also electrical with comparison circuit 12
It is connected.
Where it is assumed that the voltage at the 7th resistance R6 two ends is Vref, flow through the common port of manostat D1
Electric current be Iref, the voltage of the node between the 8th resistance R7 and the 4th resistance R3 is VKA, then
The computing formula of VKA is: VKA=Vref* (1+R5/R6)+Iref*R5.Wherein, manostat is passed through
The pressure stabilization function of D1 so that reference value produce circuit 11 the 8th resistance R7 and the 4th resistance R3 it
Between node can produce stable voltage VKA, voltage VKA by the 4th resistance R3 and the 5th electricity
Reference voltage Vref 1 is obtained, to be supplied to comparison circuit 12 after resistance R4 dividing potential drop.
Comparison circuit 12 includes the 9th resistance R8, the tenth resistance R9, the 11st resistance R10, compares
Device TP, stabilivolt D2, the most described stabilivolt D2 can be Zener diode.Wherein, comparator
The positive input of TP by the tenth resistance R9 and reference value produce circuit 11 the 4th resistance R3 and
Node between 5th resistance R4 is electrical connected, and the reverse input end of comparator TP passes through the 9th resistance
R8 is electrical connected with the outfan Vs of circuit for detecting 10, and the outfan of comparator TP passes through the 11st
Resistance R10 is connected with outfan, the outfan of comparator TP by the 11st resistance R10 also with surely
The negative electrode of pressure pipe D2 is connected, the plus earth of stabilivolt D2.
Wherein, circuit for detecting 10 is provided by the comparator TP in comparison circuit 12 voltage signal and ginseng
The reference voltage that examining value generation circuit 11 provides compares, and exports according to its outfan of comparative result
Corresponding level signal.Specifically, such as, if comparator TP compares show that voltage signal is more than reference
During voltage, then outfan output high level signal, draws when voltage signal is less than reference voltage if comparing,
Then outfan output low level signal.Wherein, stabilivolt D2 plays pressure stabilization function, in other embodiments
In, it is also possible to save stabilivolt D2 according to actual needs.
Work process the following detailed description of power supply changeover device:
First resistance Rs sampling of circuit for detecting 10 flows through the electric current of load 9, and by the first resistance
Node between Rs and load 9 provides voltage signal Vs1 to amplifying circuit 13.In amplifying circuit 13
Amplifier OP1 voltage signal Vs1 is amplified after be supplied to comparison circuit by outfan Vs
12.It addition, the node that reference value produces between the 4th resistance R3 and the 5th resistance R4 of circuit 11 carries
Comparison circuit 12 is given for stable reference voltage Vref 1.Comparator TP in comparison circuit 12 will detect
The reference voltage Vref 1 that the voltage signal that slowdown monitoring circuit 10 provides and reference value produce circuit 11 and provide is carried out
Relatively, and according to comparative result its output end vo ut corresponding level signal of output, such as, if comparing
Draw when voltage signal is more than reference voltage, then output end vo ut exports high level signal, if comparing
When going out voltage signal less than reference voltage, then output end vo ut output low level signal.
In sum, the power supply changeover device that the embodiment of the present invention provides, by circuit for detecting detecting load
Electric current, and be supplied to comparison circuit after the electric current of the load of detecting is converted to voltage signal；Reference
Value produces circuit and produces reference voltage, and the reference voltage of generation is supplied to comparison circuit；The most electric
The reference voltage that the voltage signal that circuit for detecting is provided by road and reference value produce circuit and provide compares
Relatively, and according to comparative result corresponding level signal is exported.Such that it is able to output plurality of level signal,
And simple in construction, additionally it is possible to improve conversion efficiency, reduce EMI noise, and can greatly drop
Low cost.
The above, be only presently preferred embodiments of the present invention, and the present invention not makees any form
On restriction, although the present invention is disclosed above with preferred embodiment, but is not limited to this
Bright, any those skilled in the art, in the range of without departing from technical solution of the present invention, when can
The technology contents utilizing the disclosure above is made a little change or is modified to the Equivalent embodiments of equivalent variations,
In every case it is that the technical spirit of the foundation present invention is to above example without departing from technical solution of the present invention content
Any simple modification, equivalent variations and the modification made, all still falls within the scope of technical solution of the present invention
In.
Claims (7)
1. a power supply changeover device, it is characterised in that comprising: outfan, circuit for detecting, reference
Value generation circuit, comparison circuit, wherein,
Described circuit for detecting, is electrical connected with described comparison circuit, load, is used for detecting described load
Electric current, and it is electric to be supplied to described comparison after the electric current of described load of detecting is converted to voltage signal
Road；
Described reference value produces circuit, is electrical connected with described comparison circuit, is used for producing reference voltage,
And the reference voltage of generation is supplied to described comparison circuit；
Described comparison circuit, is electrical connected with described outfan, for provided by described circuit for detecting
The reference voltage that voltage signal and described reference value produce circuit and provide compares, and according to comparing knot
Fruit exports corresponding level signal.
Power supply changeover device the most according to claim 1, it is characterised in that described circuit for detecting bag
Including the first resistance, one end of described first resistance is electric with the input of described load and described circuit for detecting
Property be connected, the other end ground connection of described first resistance.
Power supply changeover device the most according to claim 1, it is characterised in that described circuit for detecting bag
Including amplifying circuit, described amplifying circuit is electrical connected with described comparison circuit, for being put by voltage signal
Described comparison circuit it is supplied to after great.
Power supply changeover device the most according to claim 3, it is characterised in that described amplifying circuit bag
Include the second resistance, the 3rd resistance, amplifier, the positive input of described amplifier and described load electricity
Property be connected, the reverse input end of described amplifier passes through described second resistance eutral grounding, also by described the
Three resistance are electrical connected with the outfan of described amplifier.
Power supply changeover device the most according to claim 1, it is characterised in that described reference value produces
Circuit includes the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and manostat,
First end ground connection of described manostat, the second end of described manostat passes through described 8th resistance with described
Reference value produces the input of circuit and is electrical connected, and the common port of described manostat is by described 7th electricity
Resistance ground connection, described 6th resistance is connected between the second end and the common port of described manostat, and described the
One end of four resistance is electrical connected with the second end of described manostat, and the other end of described 4th resistance leads to
Crossing described 5th resistance eutral grounding, the other end of described 4th resistance is also electrical connected with described comparison circuit.
Power supply changeover device the most according to claim 1, it is characterised in that described comparison circuit bag
Include the 9th resistance, the tenth resistance, the 11st resistance, comparator；The positive input of described comparator
Produce circuit by described tenth resistance and described reference value to be electrical connected, described comparator the most defeated
Entering end to be electrical connected with described circuit for detecting by described 9th resistance, the outfan of described comparator leads to
Cross described 11st resistance to be connected with described outfan.
Power supply changeover device the most according to claim 1, it is characterised in that described comparison circuit is also
Including stabilivolt, the negative electrode of described stabilivolt is electrical connected with described outfan, the sun of described stabilivolt
Pole ground connection.
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|---|---|---|---|
| CN201610559791.0A CN106026633A (en) | 2016-07-15 | 2016-07-15 | Power converter |
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|---|---|---|---|
| CN201610559791.0A CN106026633A (en) | 2016-07-15 | 2016-07-15 | Power converter |
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Application publication date: 20161012 |