CN104734478B - Power supply change-over device and its control chip - Google Patents
Power supply change-over device and its control chip Download PDFInfo
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- CN104734478B CN104734478B CN201310711469.1A CN201310711469A CN104734478B CN 104734478 B CN104734478 B CN 104734478B CN 201310711469 A CN201310711469 A CN 201310711469A CN 104734478 B CN104734478 B CN 104734478B
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- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of power supply change-over device and its control chip, and the power supply change-over device receives an alternating current input power supplying with an input side, including：Electric capacity, AC-DC conversion unit and discharge cell.Wherein, electric capacity is coupled in input side.AC-DC conversion unit couples input side, is changed to receive after the alternating current input power supplying to produce a DC output power.Discharge cell coupling capacitance, and with least two switch elements.When the alternating current input power supplying supply discontinuity, discharge cell enable at least two switch elements so that one of one first discharge path and one second discharge path of the formation of at least two switch elements are used as the electric energy released stored by electric capacity.The electric energy that can quickly be released stored by electric capacity in alternating current input power supplying supply discontinuity of the present invention, and keep when alternating current input power supplying is supplied extremely low power consumption.
Description
Technical field
It can be supplied the invention relates to a kind of power converter topology, and in particular to one kind in alternating current input power supplying
The power supply change-over device and its control chip of the electric energy stored by X electric capacity are discharged/released when should interrupt in real time.
Background technology
Power supply change-over device（power conversion apparatus）The exchange that Utilities Electric Co. can be provided is defeated
Enter power supply（AC input power）It is converted into DC output power（DC output power）.Therefore, power supply change-over device is wide
Apply generally in the electronic installations such as computer, office automation devices, industrial control equipment, and communication apparatus.
In general, the input stage of conventional power source conversion equipment（input stage）It is configured with EMI Filtering mostly
Device（EMI filter）With filter out/suppress received alternating current input power supplying in electromagnetic interference（EMI）.However, when power supply turns
During the alternating current input power supplying supply discontinuity that changing device is received, the electric energy remained in the X electric capacity of EMI FILTER is in nothing
The danger that can cause to get an electric shock is would be possible in the case of discharge path.Therefore, considering based on security, international safety standard rule
Especially specification is established a capital：When the alternating current input power supplying that power supply change-over device is received is interrupted, the input of power supply change-over device
The electric energy remained in the X electric capacity for the EMI FILTER that level is configured has to be down in the range of safe voltage in 1 second.
Base this, discharge resistance can be utilized mostly now（bleeder resistor）To be attempted by the two ends of X electric capacity, so that
In the alternating current input power supplying supply discontinuity that power supply change-over device is received, the discharge path of X electric capacity is used as.Unfortunately, utilize
The practice of discharge resistance will necessarily cause certain power attenuation.Consequently, it is possible to which power supply change-over device will be had a strong impact on standby
Energy-conservation performance under state（power saving performance）, so as to not meet Energy Star（Energy star）Or
Other energy-conservation associations（For example：CSA, DoE, EuP etc.）The energy-conservation concept advocated, or the standby power rule of renewal can not be met
Model.
The content of the invention
In view of this, the present invention provides a kind of power supply change-over device and its control chip, and it can be in alternating current input power supplying
Safety electric capacity is discharged/released during supply discontinuity in real time（For example：X electric capacity）Stored electric energy, and the solution taken
（solution）The performance of extremely low power consumption is also equipped with, uses and efficiently solves the problem of prior art is addressed.
Other objects of the present invention and advantage can be further understood from technical characteristic disclosed in this invention.
In this, one embodiment of the invention provides a kind of power supply change-over device, and it receives an exchange with an input side and inputted
Power supply and including：Electric capacity, AC-DC conversion unit, and discharge cell.Wherein, electric capacity coupling input side.AC-DC conversion list
Member coupling input side, is changed to produce a DC output power to receive after the alternating current input power supplying.Discharge cell
Coupling capacitance, and with least two switch elements.When the alternating current input power supplying supply discontinuity, described in discharge cell meeting enable
At least two switch elements so that one first discharge path of at least two switch elements formation and one second discharge path its
One of, it is used as the electric energy released stored by X electric capacity.
In one embodiment of this invention, input side has first input end and the second input, and described at least two open
It is that first switching element is constituted with second switch element to close element.In addition, discharge cell can include：First discharge resistance,
Two discharge resistances, first switching element, second switch element, and control circuit.Wherein, the first end coupling of the first discharge resistance
Connect first input end.The first end of second discharge resistance couples the second input.The drain electrode coupling first of first switching element is put
Second end of resistance, the source electrode of first switching element is coupled to a fixed potential, and the grid of first switching element is then used to
Receive a control signal.Second end of drain electrode the second discharge resistance of coupling of second switch element, the source electrode of second switch element
The fixed potential is coupled to, and the grid of second switch element is then to receive the control signal.Control circuit coupling is defeated
Enter side, to the state according to the alternating current input power supplying, send out the control signal to control first switching element and second
The switching of switch element.
In another embodiment of the invention, control circuit can include：First resistor, the first electric capacity, the first diode,
Second diode, the second electric capacity, second resistance, and Zener diode.Wherein, the first end coupling first of first resistor is inputted
End, and the first end of the first electric capacity is then coupled to the second end of first resistor.The anode of first diode couples the first electric capacity
Second end, and the negative electrode of the first diode is then coupled to the fixed potential.The negative electrode of second diode couples the first diode
Anode, and the anode of the second diode is then coupled to the grid of first switching element and second switch element.Second electric capacity
First end couples the anode of the second diode, and the second end of the second electric capacity is then coupled to the fixed potential.Second resistance with
Second electric capacity is connected in parallel, and Zener diode is connected in parallel with second resistance.On this condition, first and second switch member
Part, the second diode, the second electric capacity, second resistance and Zener diode can be encapsulated in the first control chip.
In one embodiment of this invention, control circuit can include：First resistor, the first electric capacity, Zener diode, two
Pole pipe, the second electric capacity, and second resistance.Wherein, the first end coupling first input end of first resistor, and the of the first electric capacity
One end is then coupled to the second end of first resistor.Second end of anode the first electric capacity of coupling of Zener diode, and the pole of Zener two
The negative electrode of pipe is then coupled to the fixed potential.The anode of the negative electrode coupling Zener diode of diode, and the anode of diode
Then it is coupled to the grid of first and second switch element.The anode of the first end coupling diode of second electric capacity, and the second electric capacity
The second end be then coupled to the fixed potential.Second resistance is connected in parallel with the second electric capacity.On this condition, first switch member
Part, second switch element, diode, the second electric capacity and second resistance can be encapsulated in the second control chip.
In one embodiment of this invention, first and second switch element can be imitated by vague and general XingNXing metal-oxide-semiconductor (MOS)s
Transistor is answered to be constituted.
In one embodiment of this invention, AC-DC conversion unit can include：Full-bridge rectifier, its receiving side and power supply
The input side of conversion equipment couples to receive the alternating current input power supplying；And bulky capacitor, its outlet side with full-bridge rectifier
Couple and connect to produce the DC output power.
One embodiment of the invention separately provides a kind of control chip, and it is applied in a power supply change-over device.Power convert
Device receives an alternating current input power supplying with an input side, and this input side has a first input end and one second input.Electricity
Supply changeover device includes an electric capacity, is coupled to the first input end and second input；One first discharge resistance, its first end
Couple the first input end；One second discharge resistance, its first end couples second input；One first resistor, its first end
Couple the first input end；One first electric capacity, its first end couples the second end of the first resistor；And one first diode,
Its anode couples the second end of first electric capacity, and its negative electrode is then coupled to a fixed potential.Control chip includes：One first opens
Element is closed, it, which drains, couples the second end of first discharge resistance, and its source electrode is then coupled to the fixed potential；One second switch
Element, it, which drains, couples the second end of second discharge resistance, and its source electrode is then coupled to the fixed potential；One the 2nd 2 pole
Pipe, its negative electrode couples the anode of first diode, and its anode is then coupled to the first switching element and second switch member
The grid of part；One second electric capacity, its first end couples the anode of second diode, and its second end is then coupled to fixation electricity
Position；One second resistance, it is connected in parallel with second electric capacity；And Zener diode, it is connected in parallel with the second resistance.
One embodiment of the invention provides a kind of control chip again, and it is applied in a power supply change-over device.Power convert
Device receives an alternating current input power supplying with an input side, and this input side has a first input end and one second input.Electricity
Supply changeover device includes an electric capacity, is coupled to first input end and the second input；One first discharge resistance, the coupling of its first end
The first input end；One second discharge resistance, its first end couples second input；One first resistor, the coupling of its first end
The first input end；One first electric capacity, its first end couples the second end of the first resistor；And Zener diode, its sun
Pole couples the second end of first electric capacity, and its negative electrode is then coupled to a fixed potential.Control chip includes：One first switch member
Part, it, which drains, couples the second end of first discharge resistance, and its source electrode is then coupled to the fixed potential；One second switch member
Part, it, which drains, couples the second end of second discharge resistance, and its source electrode is then coupled to the fixed potential；One diode, it is cloudy
Pole couples the anode of Zener diode, and its anode is then coupled to the grid of the first switching element and the second switch element；
One second electric capacity, its first end couples the anode of the diode, and its second end is then coupled to the fixed potential；One second electricity
Resistance, it is connected in parallel with second electric capacity.
Based on above-mentioned, power supply change-over device and its control chip provided by the present invention can be supplied in alternating current input power supplying
Safety electric capacity is discharged in real time and promptly/releases during interruption（For example：X electric capacity）Stored electric energy, and the solution party taken
Case（That is, the circuit of discharge cell implements aspect）It is also equipped with the performance of extremely low power consumption（Because being all passive device and nothing
The reason for needing external bias to supply）, so be able to efficiently solve the problem of prior art is addressed.In addition, based on putting
The circuit of electric unit implements aspect, can fully flexibility selection X electric capacity with design configurations in power supply change-over device
The EMI FILTER of input stage, so that differential mode EMI Filtering is optimized, and can reduce electromagnetic interference filter
The cost for the inductance implemented in ripple device（Because big X electric capacity can allow to use small electric sensing unit）.
For features described above disclosed by the invention and advantage can be become apparent, special embodiment below, and coordinate accompanying drawing
It is described in detail below.
It should, however, be understood that above-mentioned general description and detailed description below are only exemplary and illustrative, its
The scope of the invention to be protected can not be limited.
Brief description of the drawings
Following accompanying drawing is a part for specification disclosed by the invention, shows example embodiment disclosed by the invention,
Accompanying drawing illustrates the principle of the present invention together with the description of specification.
Fig. 1 shows the schematic diagram of the power supply change-over device 10 of one embodiment of the invention；
Fig. 2 shows the implementation schematic diagram of Fig. 1 power supply change-over device 10；
Fig. 3 A show the implementation schematic diagram of the control circuit 201 of one embodiment of the invention；
Fig. 3 B show that the circuit of one embodiment of the invention carries out integrated part equivalent schematic；
Fig. 4 A show the implementation schematic diagram of the control circuit 201 of another embodiment of the present invention；
Fig. 4 B show that the circuit of another embodiment of the present invention carries out integrated part equivalent schematic.
Description of reference numerals：
10：Power supply change-over device；
101：AC-DC conversion unit；
103：Discharge cell；
201：Control circuit；
CX：X electric capacity；
BD：Full-bridge rectifier；
CB：Bulky capacitor；
Q1、Q2：Switch element；
R1、R2：Resistance；
C1、C2：Electric capacity；
D1、D2：Diode；
ZD：Zener diode；
RB1、RB2：Discharge resistance；
IC-1：First control chip；
IC-2：Second control chip；
L、N：Input side；
S1、S2：The receiving side of full-bridge rectifier；
S3、S4：The outlet side of full-bridge rectifier；
AC_IN：Alternating current input power supplying；
DC_OUT：DC output power；
CS：Control signal；
LOOP1、LOOP2：Discharge path；
①、②、③、④：Pin position.
Embodiment
With detailed reference to embodiments of the invention, the example of the embodiment is illustrated in the accompanying drawings.In addition, all possibility
Place, same or like part is represented in schema and embodiment using element/component of identical label.
Fig. 1 shows the schematic diagram of the power supply change-over device 10 of one embodiment of the invention, and Fig. 2 shows Fig. 1 Power convert
The implementation schematic diagram of device 10.Please refer to Fig. 1 and Fig. 2, power supply change-over device 10 at least includes：Electric capacity CX（For example, X electricity
Hold, therefore electric capacity CX is renamed as into X electric capacity CX below）, AC-DC conversion unit（AC-to-DC conversion unit）101,
And discharge cell（discharge unit）103.In the present embodiment, X electric capacity CX is coupled in the defeated of power supply change-over device 10
Enter side, and this input side has a first input end（For example, L ends）With one second input（For example, N-terminal）.But, at it
In his one exemplary embodiment, first input end can be changed to N-terminal, and the second input can then be changed to L ends, all regard actual design or
In application demand.The second input it will be N-terminal to illustrate by L ends of first input end below.AC-DC conversion list
Member 101 couples the input side of power supply change-over device 10（L ends, N-terminal）, to receive alternating current input power supplying（AC input power）
AC_IN, and the alternating current input power supplying AC_IN received is changed（That is AC-DC conversion）To produce DC output power
DC_OUT。
For becoming apparent from, as shown in Fig. 2 AC-DC conversion unit 101 can include full-bridge rectifier（full bridge
rectifier）BD and bulky capacitor（buck capacitor）CB.Wherein, full-bridge rectifier BD receiving side（S1,S2）With input
Side（L ends, N-terminal）Coupling is to receive alternating current input power supplying AC_IN, so as to carry out full-wave rectification.In addition, bulky capacitor CB is and full-bridge
Rectifier BD outlet side（S3,S4）Coupling is to be filtered operation, so as to produce DC output power DC_OUT.It is worth herein
One is mentioned that, produced DC output power DC_OUT can be a relative High Level DC Voltage（For example：380V~400V, but
It is not restricted to this）, and it can be by based on pulsewidth modulation（PWM-based）Controlling mechanism and with isolation characteristic
（isolation）Another Power convert framework and be converted into a relatively low and galvanic current pressure for load（For example：
Any kind of electronic installation）Use.
On the other hand, the coupling of discharge cell 103 X electric capacity CX, and with least two switch elements（switch elements）
（Such as Q1, Q2）.In the present embodiment, when alternating current input power supplying AC_IN supply discontinuities, discharge cell 103 can enable
（enable/activate）At least two switch elements（Q1,Q2）So that at least two switch elements（Q1,Q2）Formed
The first discharge path LOOP1（That is solid arrow path）With the second discharge path LOOP2（That is dotted arrow path）Wherein
One of, it is used as the electric energy for discharging/releasing stored by X electric capacity CX（In other words, i.e., discharge cell 103 can be in alternating current input power supplying AC_
Enable during IN supply discontinuities）.Conversely, discharge cell 103 can receive alternating current input power supplying in AC-DC conversion unit 101
Forbidden energy during AC_IN（disable/inactivate）Two switch element（Q1,Q2）, so that from electrical source consumption（Change speech
It, i.e., discharge cell 103 understands the forbidden energy when AC-DC conversion unit 101 receives alternating current input power supplying AC_IN）.
For becoming apparent from, as shown in Fig. 2 discharge cell 103 can include：Discharge resistance（bleeder resistors）
（RB1,RB2）, switch element（Q1,Q2）, and control circuit（control circuit）201.Wherein, discharge resistance RB1
First end coupling X electric capacity CX first end and the L ends of input side.Discharge resistance RB2 first end coupling X electric capacity CX the second end
With the N-terminal of input side.
Switch element Q1 drain electrode（drain）Couple discharge resistance RB1 the second end, switch element Q1 source electrode
（source）A fixed potential is coupled to, for example diagram uses earthing potential（But it is not restricted to this）, and switch element Q1
Grid（gate）Then to receive the control signal CS from control circuit 201.Switch element Q2 drain electrode coupling discharge resistance
RB2 the second end, switch element Q2 source electrode is coupled to earthing potential, and switch element Q2 grid is then same next to receive
From the control signal CS of control circuit 201.
Control circuit 201 couples input side（L ends, N-terminal）And switch element（Q1,Q2）, to according to exchange input electricity
Source AC_IN state（For example, normal or interruption）, sending control signal CS is with controlling switch element（Q1,Q2）Switching（I.e.
Conducting（ON）Or close（OFF））.In the present embodiment, switch element（Q1,Q2）Can be by vague and general XingNXing metal-oxide-semiconductor (MOS)s
Effect transistor（N-type depletion MOSFETs）Constitute, but be not restricted to this.On this condition, in exchange input
During power supply AC_IN supply discontinuities, switch element（Q1,Q2）It can react on（0V）Control signal CS and turn on, use so that discharging
Electric energy of the enable of unit 103 to release stored by X electric capacity CX；In addition, receiving exchange input in AC-DC conversion unit 101
During power supply AC_IN, switch element（Q1,Q2）It can react on（Negative pressure）Control signal CS and close, use so that discharge cell 103
Forbidden energy and any power is not consumed ideally（0W）Or actually consume extremely low power attenuation（1~2W）.
For becoming apparent from, Fig. 3 A show the implementation schematic diagram of the control circuit 201 of one embodiment of the invention.Refer to figure
3A, control circuit 201 as shown in Figure 3A can include：Resistance（R1,R2）, electric capacity（C1,C2）, diode（D1,D2）, and
Zener diode（Zener diode）ZD.Wherein, the L ends of the input side of resistance R1 first end coupling power supply change-over device 10,
And electric capacity C1 first end is then coupled to resistance R1 the second end.Diode D1 anode（anode）The second of coupling capacitance C1
End, and diode D1 negative electrode（cathode）Then it is coupled to earthing potential.Diode D2 negative electrode coupling diode D1 sun
Pole, and diode D2 anode is then coupled to switch element（Q1,Q2）Grid to produce control signal CS.The first of electric capacity C2
End coupling diode D2 anode, and electric capacity C2 the second end is then coupled to earthing potential.Resistance R2 and electric capacity C2 coupled in parallel,
And Zener diode ZD and resistance R2 coupled in parallel.In practice, switch element（Q1,Q2）, diode D2, electric capacity C2, resistance R2
And Zener diode ZD can carry out integrated having such as 4 pin position to be encapsulated in（But it is not restricted to this）Integrated electricity
Road（First control chip IC-1, as shown in Figure 3 B）In, Fig. 3 B show that the circuit of one embodiment of the invention carries out integrated portion
Divide equivalent schematic, wherein diode（D1,D2）, electric capacity C2, resistance R2 and Zener diode ZD can constitute a negative pressure pincers
Bit line（negative voltage clamping circuit）, can control brilliant with vague and general type N-type gold oxygen semiconductor field effect
The switch element of body pipe（Q1,Q2）Switching, reach the control effectively discharged.
On the other hand, Fig. 4 A show the implementation schematic diagram of the control circuit 201 of another embodiment of the present invention.Refer to Fig. 4 A
Shown control circuit 201 can include：Resistance（R1,R2）, electric capacity（C1,C2）, Zener diode ZD, and diode D2.
Wherein, the L ends of the input side of resistance R1 first end coupling power supply change-over device 10, and electric capacity C1 first end is then coupled to electricity
Hinder R1 the second end.Zener diode ZD anode coupling capacitance C1 the second end, and Zener diode ZD negative electrode is then coupled
To earthing potential.Diode D2 negative electrode coupling Zener diode ZD anode, and diode D2 anode is then coupled to switch
Element（Q1,Q2）Grid to produce control signal CS.Electric capacity C2 first end coupling diode D2 anode, and electric capacity C2
Second end is then coupled to earthing potential.Resistance R2 and electric capacity C2 coupled in parallel.In practice, switch element（Q1,Q2）, diode
D2, electric capacity C2 and resistance R2 can similarly carry out integrated having such as 4 pin position to be encapsulated in（But it is not restricted to
This）Integrated circuit（Second control chip IC-2, as shown in Figure 4 B）In, Fig. 4 B show that the circuit of another embodiment of the present invention enters
The integrated part equivalent schematic of row, wherein Zener diode ZD, diode D2, electric capacity C2 and resistance R2 similarly also can
Negative pressure clamp circuit is constituted, the switch element with vague and general type N-type gold oxygen semiconductor field effect transistor is can control（Q1,Q2）Cut
Change, reach the control effectively discharged.
Based on above-mentioned, when AC-DC conversion unit 101 receives alternating current input power supplying AC_IN, either Fig. 3 A are also
It is Fig. 4 A control circuit 201, its internal negative pressure clamp circuit will all produce a vacuum cavitations signal CS.Such one
Come, based on the element characteristic of vague and general type N-type gold oxygen semiconductor field effect transistor, switch element（Q1,Q2）It will react on negative
Press control signal CS and close, so that forbidden energy discharge cell 103.On this condition, discharge resistance（RB1,RB2）Will be because not complete
The reason in whole loop is without causing any power attenuation.
On the other hand, when alternating current input power supplying AC_IN is interrupted, either Fig. 3 A or Fig. 4 A control circuit 201, its
Control signal CS produced by internal negative pressure clamp circuit will be reduced because of alternating current input power supplying AC_IN disappearance, and
And fallen electric capacity C2 electric charge quick release by resistance R2, so as to produce 0V control signals CS.Consequently, it is possible to switch element
（Q1,Q2）0V control signals CS will be reacted on and turned on, so that enable discharge cell 103, and the switch element turned on
（Q1,Q2）Will be with discharge resistance（RB1,RB2）Form complete discharge path（LOOP1,LOOP2）With the X electric capacity CX institutes that release
The electric energy of storage（The electric charge stored up in X electric capacity CX is discharged to reduce X electric capacity CX both end voltage）.
For becoming apparent from, when alternating current input power supplying AC_IN is interrupted, if the L ends of the input side of power supply change-over device 10
Voltage is timing, then discharge cell 103 can provide correspondence to switch element Q1 the first discharge path LOOP1 with X electric capacity of releasing
Electric energy stored by CX, and allowed X electric capacity CX voltage to drop in the range of safe voltage in 1 second（For example it is down to original level
37%, but be not restricted to this）；Conversely, when alternating current input power supplying AC_IN is interrupted, if the input of power supply change-over device 10
The N-terminal voltage of side is timing, then discharge cell 103 can provide correspondence to switch element Q2 the second discharge path LOOP2 to let out
The electric energy stored by X electric capacity CX is put, and allowed X electric capacity CX voltage to drop in the range of safe voltage in 1 second（For example it is down to original
The 37% of first level, but it is not restricted to this）.
In summary, the present invention is carried power supply change-over device 10 and its control chip（IC-1,IC-2）Can be in exchange
The electric energy stored by X electric capacity CX is discharged in real time and promptly/releases during input power AC_IN supply discontinuities（Note：As long as choosing suitable
When external discharge resistance（RB1,RB2）X electric capacity CX voltage can be allowed to drop in the range of safe voltage in 1 second）, and institute
The solution taken（That is, the circuit of discharge cell 103 implements aspect）It is also equipped with the performance of extremely low power consumption（Because all
The reason supplied for passive device and without external bias, and be, for example, less than 1~2mW）, so be able to efficiently solve existing skill
The problem of art is addressed.In addition, circuit based on discharge cell 103 implements aspect, can fully flexibility choosing
Select X electric capacity CX with design configurations the input stage of power supply change-over device 10 EMI FILTER（EMI filter）, so that
So that differential mode EMI Filtering is optimized, and the cost for the inductance implemented in EMI FILTER can be reduced（Cause
It can allow the reason using small electric sensing unit for big X electric capacity CX）.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (7)
1. a kind of power supply change-over device a, it is characterised in that alternating current input power supplying is received with an input side, including：
One electric capacity, couples the input side；
One AC-DC conversion unit, couples the input side, is changed to receive after the alternating current input power supplying to produce always
Flow out-put supply；And
One discharge cell, couples the electric capacity, and with least two switch elements, wherein when the alternating current input power supplying supply discontinuity
When, the discharge cell enable at least two switch elements so that at least two switch elements formation one first discharge path with
One of one second discharge path, as the electric energy released stored by the electric capacity, wherein, the input side is defeated with one first
Enter end and one second input, at least two switch elements are that a first switching element is constituted with a second switch element, and are somebody's turn to do
Discharge cell includes：
One control circuit, couples the input side, to the state according to the alternating current input power supplying, sends out a control signal to control
This first with the switching of the second switch element, the wherein control circuit includes：
One first resistor, its first end couples the first input end；
One first electric capacity, its first end couples the second end of the first resistor；
Zener diode, its anode couples the second end of first electric capacity, and its negative electrode is then coupled to a fixed potential；
One diode, its negative electrode couples the anode of the Zener diode, and its anode is then coupled to the first switching element with being somebody's turn to do
The grid of second switch element；
One second electric capacity, its first end couples the anode of the diode, and its second end is then coupled to the fixed potential；And
One second resistance, it is connected in parallel with second electric capacity.
2. power supply change-over device according to claim 1, the wherein discharge cell include：
One first discharge resistance, its first end couples the first input end；
One second discharge resistance, its first end couples second input；
The first switching element, it, which drains, couples the second end of first discharge resistance, and its source electrode is coupled to the fixed potential, and
Its grid receives the control signal；And
The second switch element, it, which drains, couples the second end of second discharge resistance, and its source electrode is coupled to the fixed potential, and
Its grid receives the control signal.
3. power supply change-over device according to claim 1, it is characterised in that the first switching element, second switch member
Part, the diode, second electric capacity and the second resistance are encapsulated in one second control chip.
4. power supply change-over device according to claim 1, it is characterised in that the first switching element and second switch member
Part is made up of a vague and general type N-type gold oxygen semiconductor field effect transistor respectively.
5. power supply change-over device according to claim 1, it is characterised in that the AC-DC conversion unit includes：
One full-bridge rectifier, its receiving side couples to receive the alternating current input power supplying with the input side；And
One bulky capacitor, is coupled to produce the DC output power with the outlet side of the full-bridge rectifier.
6. a kind of control chip, it is adaptable in a power supply change-over device, the power supply change-over device receives one with an input side and exchanged
Input power, the input side has a first input end and one second input, and the power supply change-over device includes an electric capacity, coupling
In the first input end and second input；One first discharge resistance, its first end couples the first input end；One second puts
Resistance, its first end couples second input；One first resistor, its first end couples the first input end；One first electricity
Hold, its first end couples the second end of the first resistor；And Zener diode, its anode couples the second of first electric capacity
End, and its negative electrode is then coupled to a fixed potential, the control chip includes：
One first switching element, it, which drains, couples the second end of first discharge resistance, and its source electrode is then coupled to fixation electricity
Position；
One second switch element, it, which drains, couples the second end of second discharge resistance, and its source electrode is then coupled to fixation electricity
Position；
One diode, its negative electrode couples the anode of the Zener diode, and its anode is then coupled to the first switching element with being somebody's turn to do
The grid of second switch element；
One second electric capacity, its first end couples the anode of the diode, and its second end is then coupled to the fixed potential；And
One second resistance, it is connected in parallel with second electric capacity.
7. control chip according to claim 6, it is characterised in that the first switching element and the second switch element point
Not be made up of a vague and general type N-type gold oxygen semiconductor field effect transistor.
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| CN201310711469.1A CN104734478B (en) | 2013-12-20 | 2013-12-20 | Power supply change-over device and its control chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310711469.1A CN104734478B (en) | 2013-12-20 | 2013-12-20 | Power supply change-over device and its control chip |
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| CN104734478B true CN104734478B (en) | 2017-10-27 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420176A (en) * | 2007-10-26 | 2009-04-29 | 英业达股份有限公司 | Power source converter having current limiting function |
| TW201112603A (en) * | 2009-09-24 | 2011-04-01 | Grenergy Opto Inc | Safety capacitor discharging method and apparatus for ac-to-dc converters |
| CN102332835A (en) * | 2010-07-12 | 2012-01-25 | 台达电子工业股份有限公司 | Discharge circuit of power supply circuit and active control circuit of discharge circuit |
-
2013
- 2013-12-20 CN CN201310711469.1A patent/CN104734478B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420176A (en) * | 2007-10-26 | 2009-04-29 | 英业达股份有限公司 | Power source converter having current limiting function |
| TW201112603A (en) * | 2009-09-24 | 2011-04-01 | Grenergy Opto Inc | Safety capacitor discharging method and apparatus for ac-to-dc converters |
| CN102332835A (en) * | 2010-07-12 | 2012-01-25 | 台达电子工业股份有限公司 | Discharge circuit of power supply circuit and active control circuit of discharge circuit |
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| CN104734478A (en) | 2015-06-24 |
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