CN110112896A - Linear leadage circuit and power-supply system - Google Patents
Linear leadage circuit and power-supply system Download PDFInfo
- Publication number
- CN110112896A CN110112896A CN201910411079.XA CN201910411079A CN110112896A CN 110112896 A CN110112896 A CN 110112896A CN 201910411079 A CN201910411079 A CN 201910411079A CN 110112896 A CN110112896 A CN 110112896A
- Authority
- CN
- China
- Prior art keywords
- switch
- module
- voltage
- controlled
- linear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 75
- 238000002955 isolation Methods 0.000 claims description 26
- 230000003321 amplification Effects 0.000 claims description 21
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 21
- 230000005669 field effect Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 11
- 239000004065 semiconductor Substances 0.000 claims description 11
- 230000004044 response Effects 0.000 abstract description 8
- 230000005611 electricity Effects 0.000 description 8
- 230000007423 decrease Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to a kind of linear leadage circuit and power-supply systems, in the electric current for the power output end that needs to release, the first switch end of the first controlled switch is connected with second switch end by receiving switch level signal, so as to form bleed-off circuit between two output ends of power supply；Meanwhile by biasing module, the voltage difference for being kept fixed the pressure stabilizing end of second switch end and Voltage stabilizing module.Based on this, the pressure stabilizing end of Voltage stabilizing module obtains stable voltage according to switch level signal, that is the release electric current of module of the voltage, electric current at second switch end is fixed, so that releasing for bleed-off circuit is not influenced by the output voltage of power output end, electric current release module electric current it is constant, so that the output voltage fall off rate of power output end is constant, to improve the response speed of the output voltage of power output end.
Description
Technical field
The present invention relates to power circuit technical fields, more particularly to a kind of linear leadage circuit and power-supply system.
Background technique
It in power supply application, generally requires to respond faster, such as when reference voltage reduces, the output voltage of power supply
It is required that have faster response speed, that is, the output electric current for the power supply that needs quickly to release, so that output voltage declines.Wherein, power supply
Two output ends generally by output capacitance be connected with each other, output voltage is the voltage at out-put supply both ends.
However, the leadage circuit of the output electric current for the power supply that is traditionally used for releasing, leakage current with output voltage reduction
And reduce, when power supply is in underloading or zero load, if output capacitance capacitance is larger, the response speed of output voltage can be very slow,
It is difficult to meet the application requirement of power supply.On the other hand, when power supply shuts down, if fictitious load is lighter, need the long period that can just release
The charge in output capacitance is bled off, there are some potential safety problemss for this.
Summary of the invention
Based on this, it is necessary to it is directed to when power supply is in underloading or zero load, if output capacitance capacitance is larger, output voltage
Response speed can be very slow problem, a kind of linear leadage circuit and power-supply system are provided.
A kind of linear leadage circuit, including Voltage stabilizing module, biasing module, the first controlled switch and electric current are released module；
The first switch end of first controlled switch is used to connect an output end of power supply, the second switch of the first controlled switch
The module that is used to release by electric current is held to connect another output end of power supply；
The controlled end of the first controlled switch of steady press bond of Voltage stabilizing module, and second switch is connected by biasing module
End；Wherein, the pressure stabilizing end of Voltage stabilizing module is for accessing switch level signal, and switch level signal is for making the first controlled switch
First switch end is connected with second switch end.
Above-mentioned linear leadage circuit is made in the electric current for the power output end that needs to release by receiving switch level signal
The first switch end of first controlled switch is connected with second switch end, so as to form bleed-off circuit between two output ends of power supply；Together
When, by biasing module, the voltage difference for being kept fixed the pressure stabilizing end of second switch end and Voltage stabilizing module.Based on this, pressure stabilizing mould
The pressure stabilizing end of block obtains stable voltage according to switch level signal, i.e. the voltage, electric current at second switch end are released the electricity of module
Stream is fixed so that releasing for bleed-off circuit is not influenced by the output voltage of power output end, electric current release module electric current it is permanent
It is fixed, so that the output voltage fall off rate of power output end is constant, to improve the response speed of the output voltage of power output end.
It in one of the embodiments, further include the first amplification module；
The first input end of first amplification module connects the pressure stabilizing end of the Voltage stabilizing module, first amplification module
Output end connect the controlled end of the first controlled switch, the output end of first amplification module connected by the biasing module
The second switch end；Second input terminal of first amplification module connects the second switch end.
First amplification module includes the first operational amplifier in one of the embodiments,；
The pressure stabilizing end of the non-inverting input terminal connection Voltage stabilizing module of first operational amplifier, the output end of the first operational amplifier
The controlled end of the first controlled switch is connected, the output end of the first operational amplifier connects second switch end by biasing module；The
The inverting input terminal of one operational amplifier connects second switch end.
It in one of the embodiments, further include pull-up module and the second controlled switch
The first switch end of second controlled switch is used to access default high level by pull-up module, the second controlled switch
First switch end is also connected with the pressure stabilizing end of Voltage stabilizing module；The second switch end of second controlled switch is for being grounded；Second controlled opens
The controlled end of pass is for accessing switch level signal.
It in one of the embodiments, further include isolation module；
The first end of the side of the isolation module is for accessing default high level；The second of the side of the isolation module
End is for being grounded, and the first end of the side of the isolation module is for accessing switch level signal；
The first end of the other side of the isolation module is used to access default high level, the other side of the isolation module
First end connects the controlled end of second controlled switch；The second end of the other side of the isolation module.
The isolation module includes photoelectrical coupler in one of the embodiments,；
The anode of the light emitting diode of photoelectrical coupler is for accessing default high level；The light emitting diode of photoelectrical coupler
Cathode for being grounded, the cathode of the light emitting diode of photoelectrical coupler is for accessing switch level signal；
The collector of the phototriode of photoelectrical coupler is for accessing default high level, photosensitive three pole of photoelectrical coupler
The collector of pipe connects the controlled end of the second controlled switch；The emitter of the phototriode of photoelectrical coupler is for being grounded.
It in one of the embodiments, further include reference voltage judgment module；
Reference voltage judgment module is used to be respectively connected to the output voltage of reference voltage and power supply, reference voltage judgment module
It is also used to export switch level signal when reference voltage is lower than the output voltage of power supply.
Reference voltage judgment module includes voltage increase module and comparison module in one of the embodiments,；
The input terminal of voltage increase module compares for accessing reference voltage, the output end of voltage increase module for connecting
The first input end of module, the second input terminal of comparison module are used to access the output voltage of power supply, the output end of comparison module
For exporting switch level signal；Wherein, the input terminal of the voltage of the output end of voltage increase module than voltage increase module
Voltage is higher by preset voltage value.
Voltage increase module includes second operational amplifier, the first divider resistance, second point in one of the embodiments,
Piezoresistance, third divider resistance, the first filter resistance and the second filter capacitor；
The non-inverting input terminal of second operational amplifier is used to access reference voltage by the first divider resistance；Second operation is put
The non-inverting input terminal of big device accesses default high level for passing sequentially through the second divider resistance and third divider resistance；
Second divider resistance connects one end of third divider resistance for respectively by the first filter resistance and the second filtering
Capacity earth.
Voltage stabilizing module includes zener diode in one of the embodiments,；
The cathode of zener diode is the pressure stabilizing end of Voltage stabilizing module, and the anode of zener diode is for being grounded.
The first controlled switch includes semiconductor switch in one of the embodiments, and the second controlled switch includes semiconductor
Switch.
The first controlled switch includes N-channel field-effect tube in one of the embodiments,；
The grid of N-channel field-effect tube is the controlled end of the first controlled switch, the drain electrode of N-channel field-effect tube be first by
The first switch end of switch is controlled, the source electrode of N-channel field-effect tube is the second switch end of the first controlled switch.
The embodiment of the present invention also provides a kind of power-supply system, including power supply and linear leadage circuit；
Linear leadage circuit includes that Voltage stabilizing module, biasing module, the first controlled switch and electric current are released module；
The first switch end of first controlled switch is used to connect an output end of power supply, the second switch of the first controlled switch
The module that is used to release by electric current is held to connect another output end of power supply；
The controlled end of the first controlled switch of steady press bond of Voltage stabilizing module, and second switch is connected by biasing module
End；Wherein, the pressure stabilizing end of Voltage stabilizing module is for accessing switch level signal, and switch level signal is for making the first controlled switch
First switch end is connected with second switch end.
Above-mentioned power-supply system makes the by receiving switch level signal in the electric current for the power output end that needs to release
The first switch end of one controlled switch is connected with second switch end, so as to form bleed-off circuit between two output ends of power supply；Meanwhile
By biasing module, the voltage difference for being kept fixed the pressure stabilizing end of second switch end and Voltage stabilizing module.Based on this, Voltage stabilizing module
Pressure stabilizing end obtains stable voltage according to switch level signal, i.e. the voltage, electric current at second switch end release module electric current it is solid
It is fixed so that releasing for bleed-off circuit is not influenced by the output voltage of power output end, electric current release module electric current it is constant, make
The output voltage fall off rate for obtaining power output end is constant, to improve the response speed of the output voltage of power output end.
Detailed description of the invention
Fig. 1 is the linear leadage circuit function structure chart of an embodiment；
Fig. 2 is the linear leadage circuit figure of an embodiment；
Fig. 3 is the linear leadage circuit function structure chart of another embodiment；
Fig. 4 is the linear leadage circuit figure of another embodiment；
Fig. 5 is the linear leadage circuit function structure chart of another embodiment；
Fig. 6 is the reference voltage judgment module structure chart of another embodiment；
Fig. 7 is the linear leadage circuit figure of another embodiment；
Fig. 8 is the power supply output waveform figure of a concrete application example；
Fig. 9 is the power supply output waveform figure of another concrete application example.
Specific embodiment
Purpose, technical solution and technical effect for a better understanding of the present invention, below in conjunction with drawings and examples
Further explaining illustration is carried out to the present invention.State simultaneously, embodiments described below for explaining only the invention, not
For limiting the present invention.
The embodiment of the present invention provides a kind of linear leadage circuit.
Fig. 1 is the linear leadage circuit function structure chart of an embodiment, as shown in Figure 1, an embodiment is linearly let out
Electric discharge road includes that Voltage stabilizing module 100, biasing module 101, the first controlled switch 102 and electric current are released module 103；
The first switch end K1 of first controlled switch 102 is used to connect an output end of power supply, the first controlled switch 102
Second switch end K2 be used for by electric current release module 103 connection power supply another output end；
Wherein, when the first switch end K1 of the first controlled switch 102 is connected with second switch end K2, an input of power supply
It is connected between end and another input terminal, forms discharge path, i.e., released between the input terminal and another input terminal of power supply by electric current
103 leakage current of module, to gradually decrease the output voltage of power supply.
The first controlled switch 102 includes semiconductor switch or electronic switch, switch level letter in one of the embodiments,
Number Clock1 is the logic level signal higher than preset voltage value.By taking the first controlled switch 102 includes semiconductor switch as an example, in advance
If voltage value is greater than the cut-in voltage of semiconductor switch.
The first end of Voltage stabilizing module 100 connects the controlled end of the first controlled switch 102, and is connected by biasing module 101
Second switch end K2；Wherein, the first end of Voltage stabilizing module 100 is for accessing switch level signal Clock1, switch level signal
Clock1 is for being connected the first switch end K1 of the first controlled switch 102 with second switch end K2.
Wherein, the controlled end of the first controlled switch 102 is connect with the first end of Voltage stabilizing module 100, and for receiving switch
Level signal Clock1, after receiving switch level signal Clock1, the first switch end K1 of the first controlled switch 102 and
Two switch terminals K2 conducting.By biasing module 101, the voltage at second switch end is made to be below or above the first of Voltage stabilizing module 100
Hold voltage.Meanwhile the first end of Voltage stabilizing module 100 can keep stable voltage level according to switch level signal Clock1, i.e.,
The voltage of second switch end K2 keeps stablizing, to accelerate the decrease speed of the output voltage of power output end.
Linear leadage circuit further includes the first amplification module in one of the embodiments,；
The first input end of first amplification module connects the pressure stabilizing end of the Voltage stabilizing module 100, first amplification
The output end of module connects the controlled end of the first controlled switch 102, and the output end of first amplification module passes through the biasing
Module 101 connects the second switch end K2；Second input terminal of first amplification module connects the second switch end K2.
Wherein, the voltage of switch level signal Clock1 can be amplified, by the first amplification module preferably to drive first
Controlled switch 102, and the voltage of second switch end K2 is improved, accelerate the decrease speed of electric power output voltage.First amplification module
Operational amplifier or transistor amplifier circuit can be selected.
Fig. 2 is the linear leadage circuit figure of an embodiment in one of the embodiments, as shown in Fig. 2, linearly releasing
The first amplification module of circuit includes the first operational amplifier U1；
The pressure stabilizing end of the non-inverting input terminal connection Voltage stabilizing module 100 of first operational amplifier U1, the first operational amplifier U1
Output end connect the controlled end of the first controlled switch 102, the output end of the first operational amplifier U1 is connected by biasing module 101
Meet second switch end K2；The inverting input terminal of first operational amplifier U1 connects second switch end K2.
Wherein, the voltage of switch level signal Clock1 can be amplified, by the first operational amplifier U1 preferably to drive
First controlled switch 102, and the voltage of second switch end K2 is improved, accelerate the decrease speed of electric power output voltage.
As shown in Fig. 2, electric current is released, module 103 includes the filtering of bleeder resistance R1 and first in one of the embodiments,
Capacitor C1；Wherein, when the first switch end K1 of the first controlled switch 102 is connected with second switch end K2, second switch end K2
Voltage stabilization, the leakage current on bleeder resistance R1 is also stable.Meanwhile first filter capacitor C1 play a filtering role, with steady
Determine the voltage of second switch end K2.As a preferably embodiment, the first filter capacitor C1 select capacitance be pF grades or
NF grades of capacitor.
First filter capacitor wherein, if the output capacitance of power supply be Cout, the maximum output voltage of power supply is Vomax, putting
Electric time tmaxInterior, electric power output voltage is down to 0V, then output capacitance C during thisoutTotal electrical charge be stored as Qmax, and Qmax
Are as follows: Qmax=CoutVomax, the leakage current I on bleeder resistance R1 at this timemAre as follows:Based on this, discharge time tmaxIt is full
Foot:
In one of the embodiments, as shown in Fig. 2, Voltage stabilizing module 100 includes zener diode D1；Wherein, pressure stabilizing two
The cathode of pole pipe D1 is the first end of Voltage stabilizing module 100, and the anode of zener diode D1 is for being grounded.Pass through zener diode D1
Keep the voltage stabilization of second switch end K2.Voltage stabilizing module 100 includes source of stable pressure in one of the embodiments,.
In one of the embodiments, as shown in Fig. 2, the first controlled switch 102 includes N-channel field-effect tube Q1；
The grid of N-channel field-effect tube Q1 is the controlled end of the first controlled switch 102, the drain electrode of N-channel field-effect tube Q1
For the first switch end K1 of the first controlled switch 102, the source electrode of N-channel field-effect tube Q1 is the second of the first controlled switch 102
Switch terminals K2.
In one of the embodiments, as shown in Fig. 2, biasing module 101 includes biasing resistor R2, pass through biasing resistor
R2 prevents N-channel field-effect tube Q1 from misleading, and reduces the grid impedance of N-channel field-effect tube Q1.
Wherein, N-channel field-effect tube Q1 is used to consume the energy of power supply, reduces the size of electric power output voltage.
In one of the embodiments, as shown in Fig. 2, the linear leadage circuit of an embodiment further includes the first current limliting electricity
Hinder R3；
As shown in Fig. 2, the output end of the first operational amplifier U1 passes through the first current-limiting resistance R3 connection N-channel field-effect tube
The grid of Q1.
It should be noted that first controlled switch 102 is also optional under the switching logic for realizing the first controlled switch 102
With other types of thyristor, such as NPN triode etc., i.e. the first controlled switch 102 include N-channel field-effect tube
Q1 is only one embodiment, does not represent the type selecting restriction to the first controlled switch 102.
Fig. 3 is the linear leadage circuit function structure chart of another embodiment in one of the embodiments, such as Fig. 3 institute
Show, the linear leadage circuit of another embodiment further includes pull-up module 200 and the second controlled switch 201；
The first switch end K3 of second controlled switch 201 is used to access default high level by pull-up module 200, second by
The first switch end K3 of control switch 201 is also connected with the first end of Voltage stabilizing module 100；The second switch end of second controlled switch 201
K4 is for being grounded；The controlled end of second controlled switch 201 is for accessing switch level signal Clcok2.
When receiving switch level signal Clcok2, the first switch end K3 and second switch of the second controlled switch 201
K4 shutdown is held, high level signal is preset and is exported by pull-up module 200 to the first end of Voltage stabilizing module 100, so that first is controlled
The first switch end K1 of switch 102 is connected with second switch end K2.Wherein, the switch level signal Clcok2 of another embodiment
Including presetting low level signal.The second controlled switch 201 includes semiconductor switch or electronic switch in one of the embodiments,
Ordinary mail number is the logic level signal lower than preset voltage value.By taking the second controlled switch 201 includes semiconductor switch as an example, preset
Voltage value is less than the cut-in voltage of semiconductor switch.
The linear leadage circuit of another embodiment further includes isolation module in one of the embodiments,；
The first end of the side of the isolation module is for accessing default high level；The second of the side of the isolation module
End is for being grounded, and the first end of the side of the isolation module is for accessing switch level signal；
The first end of the other side of the isolation module is used to access default high level, the other side of the isolation module
First end connects the controlled end of second controlled switch；The second end of the other side of the isolation module.
Wherein, isolation module is used to be isolated the side of isolation module and the signal of the other side.
In one of the embodiments, Fig. 4 be another embodiment linear leadage circuit figure, as shown in figure 4, second by
Control switch includes NPN triode Q2.
Wherein, the base stage of NPN triode Q2 is the controlled end of the second controlled switch 201, and the current collection of NPN triode Q2 is extremely
The second switch of transmitting extremely the second controlled switch 201 of the first switch end K3 of second controlled switch 201, NPN triode Q2
Hold K4.When receiving the logic level signal lower than preset voltage value, NPN triode Q2 shutdown.Default high level passes through upper
Drawing-die block 200 is exported to the first end of Voltage stabilizing module 100.As shown in figure 4, pull-up module includes pull-up resistor R4, in tri- pole NPN
When pipe Q2 is turned off, the first end of Voltage stabilizing module 100 is drawn high to default high level by pull-up resistor R4.It should be noted that
Under the switching logic for realizing the second controlled switch 201, other types of semiconductor switch is also can be selected in the second controlled switch 201
Element, i.e. the second controlled switch 201 include that NPN triode Q2 is only one embodiment, are not represented to the second controlled switch 201
Type selecting limits.
In one of the embodiments, as shown in figure 4, the linear leadage circuit of isolation module includes photoelectrical coupler U2；
The anode of the light emitting diode of photoelectrical coupler U2 is for accessing default high level；Luminous the two of photoelectrical coupler U2
The cathode of pole pipe is for being grounded, and the cathode of the light emitting diode of photoelectrical coupler U2 is for accessing switch level signal Clock3；
For the collector of the phototriode of photoelectrical coupler U2 for accessing default high level, photoelectrical coupler U2's is photosensitive
The collector of triode connects the controlled end of the second controlled switch 201；The emitter of the phototriode of photoelectrical coupler U2 is used
In ground connection.
Wherein, when the cathode of the light emitting diode of photoelectrical coupler U2 accesses switch level signal Clock3, if switch
Level signal Clock3 is default high level, then light emitting diode turns off, and the collector and emitter of phototriode disconnect, and is made
The controlled end for obtaining the second controlled switch 201 accesses default high level signal.As shown in figure 4, the anode of light emitting diode can pass through
Resistance R5 accesses default high level, and the controlled end of the second controlled switch 201 can be pulled to default high level by resistance R6；If opening
Closing level signal Clock3 is default low level, then LEDs ON, the collector of phototriode are connected with emitter,
So that the controlled end of the second controlled switch 201 accesses default low level.
The anode of the light emitting diode of photoelectrical coupler U2 is for accessing primary side side power supply electricity in one of the embodiments,
Source Vccp, the collector of the phototriode of photoelectrical coupler U2 is for accessing secondary side power supply Vccs, i.e., in photoelectric coupling
The two sides device U2 are separately connected the secondary side of original of isolated supplies, and linear leadage circuit is made to can be applied to the power supply output of isolated supplies
It releases.It is used to access by pull-up module as preferably embodiment, a first switch end K3 for the second controlled switch 201
Secondary side power supply Vccs。
In one of the embodiments, as shown in figure 4, the linear leadage circuit of another embodiment further includes diode
D2；The cathode of the light emitting diode of photoelectrical coupler U2 by diode D2 for being grounded.
Fig. 5 is the linear leadage circuit function structure chart of another embodiment in one of the embodiments, such as Fig. 5 institute
Show, the linear leadage circuit of another embodiment further includes reference voltage judgment module 300；
Reference voltage judgment module 300 is used to be respectively connected to the output voltage of reference voltage and power supply, reference voltage judgement
Module 300 is also used to export switch level signal (Clock1/Clock2/ when reference voltage is lower than the output voltage of power supply
Clock3)。
Wherein, after reference voltage judgment module 300 is respectively connected to the output voltage of reference voltage and power supply, in reference voltage
Lower than power supply output voltage when export switch level signal (Clock1/Clock2/Clock3) so that the first controlled switch
102 first switch end K1 is connected with second switch end K2.Reference voltage judgment module 300 wraps in one of the embodiments,
Include MCU.MCU is respectively connected to the output voltage of reference voltage and power supply, and compares the output voltage of reference voltage and power supply
Compared with, when reference voltage is lower than the output voltage of power supply, output switch level signal (Clock1/Clock2/Clock3).
Wherein, reference voltage judgment module 300 is believed according to the exportable switch level of output voltage of reference voltage and power supply
Number (Clock1/Clock2/Clock3), is released with opening the output of power supply, without logical signal, that is, controllable power especially
Output release and open or close.
It should be noted that defeated when reference voltage judgment module 300 is for being lower than the output voltage of power supply in reference voltage
Switch level signal (Clock1/Clock2/Clock3) out, i.e. reference voltage judgment module 300 can select photosensitive two pole of a connection
The first end of the cathode of pipe, the controlled end of the second controlled switch 201 or Voltage stabilizing module 100.
Fig. 6 is the reference voltage judgment module structure chart of another embodiment in one of the embodiments, such as Fig. 6 institute
Show, reference voltage judgment module 300 includes voltage increase module 400 and comparison module 401；
The input terminal of voltage increase module 400 is for accessing reference voltage, and the output end of voltage increase module 400 is for connecting
The first input end of comparison module 401 is connect, the second input terminal of comparison module 401 is used to access the output voltage of power supply；Compare
The output end of module 401 is for exporting switch level signal；Wherein, the voltage of the output end of voltage increase module 400 compares voltage
The voltage of the input terminal of hoisting module 400 is higher by preset voltage value.
Wherein, voltage increase module 400 is used to reference voltage promoting preset voltage value, and by the ginseng after boosted voltage
It examines voltage to be compared with the output voltage of power supply, prevents reference voltage by a small margin from declining the first controlled switch 102 of triggering
First switch end K1 is connected with second switch end K2, improves the anti-interference ability of linear leadage circuit.One embodiment wherein
In, preset voltage value and reference voltage positive correlation.It is electric as preferably embodiment, preset voltage value and a reference
It is pressed into proportional relationship.
Fig. 7 is the linear leadage circuit figure of another embodiment in one of the embodiments, as shown in fig. 7, voltage mentions
Rising mould block 400 includes amplifier or MCU.Comparison module 401 includes comparison circuit or comparator U3.Wherein, comparator U3's is same
Phase input terminal can pass through the first input resistance Rin1Connect the output end of voltage increase module 400, the inverting input terminal of comparator U3
It can be used for through the second input resistance Rin2Access the output voltage of power supply.
In one of the embodiments, as shown in fig. 7, voltage increase module 400 includes second operational amplifier U4, first
Divider resistance R7, the second divider resistance R8, third divider resistance R9, the first filter resistance R10 and the second filter capacitor C2；
The non-inverting input terminal of second operational amplifier U4 is used to access reference voltage by the first divider resistance R7；Second fortune
The non-inverting input terminal of amplifier U4 is calculated for passing sequentially through the default high electricity of the second divider resistance R8 and third divider resistance R9 access
It is flat；
As a preferably embodiment, the default high level of the second divider resistance R8 and third divider resistance R9 access
It can be primary side side power supply Vccp。
One end of second divider resistance R8 connection third divider resistance R9 for passing through the first filter resistance R10 and the respectively
Two filter capacitor C2 ground connection.
Wherein, voltage increase module by second operational amplifier U4, the first divider resistance R7, the second divider resistance R8,
Third divider resistance R9, the first filter resistance R10 and second each device of filter capacitor C2 will be with reference to electricity in conjunction with default high level
Pressure promotes preset voltage value.If reference voltage is Vref, the output end of second operational amplifier U4, i.e., voltage increase module is defeated
Outlet voltage is Vr, presetting high level is VCC, preset voltage value is Δ V, i.e. Δ V=Vr-Vref, then voltage increase module is defeated
Outlet voltage VrAre as follows:
With Δ V=Vr-Vref, then preset voltage value Δ V are as follows:
Third divider resistance R9 selects resistance value of the resistance value much larger than the first filter resistance R10 in one of the embodiments,
Resistance, the second divider resistance R8 select resistance value be approximately equal to the first filter resistance R10 resistance value resistance, the first divider resistance R7
It selects resistance value to be approximately equal to the resistance of the resistance value of third divider resistance R9, is based on this, then preset voltage value Δ V are as follows:
From the above equation, we can see that the resistance value of adjustable first divider resistance R7 and the second divider resistance R8, adjust preset voltage value
ΔV.As an optional embodiment, the first divider resistance R7 and the second divider resistance R8 select the adjustable resistance of resistance value
Element, including rheostat etc..
Meanwhile from the above equation, we can see that, preset voltage value Δ V and reference voltage VrefCorrelation, it is assumed that in moment t, electricity
Source output voltage needs to reduce, then VrefThere are following relationships: its value is V before moment ta1, its value is V after moment ta2, and have
Va1–Va2> 0, if Va1–Va2> Δ V opens leadage circuit, works as Va1When larger, Δ V higher, the output voltage of power supply is Vout, then
Need VrefV can just be met when declining largerr<Vout, so that the first switch end of the first controlled switch 102 is led with second switch end
It is logical.When the output voltage of power supply is higher, it is larger to load the overcurrent that flows down, and relies on lower to electric current module 103 of releasing, therefore works as
VrefWhen value decline is smaller, it is not necessary that the first switch end of the first controlled switch 102 is connected with second switch end, and the presence of Δ V
Noise margin is also improved, anti-interference ability is increased, prevents from making V because of interference or false triggeringr<Vout, so as to cause first by
The first switch end of control switch 102 is connected with second switch end.
In the present embodiment, by with reference voltage VrefThe preset voltage value Δ V of correlation so that first by
The first switch end of control switch 102 is connected with second switch end not by the drift effect of device value each in power supply, and raising is linearly let out
The noise margin and anti-interference ability on electric discharge road, are conducive to linear leadage circuit long-term stable work.
In one of the embodiments, as shown in fig. 7, voltage increase module further includes the 4th divider resistance R11, feedback electricity
Hinder R12 and feedback capacity C3；The output end of second operational amplifier U4 passes through feedback resistance R12 respectively and connects with feedback capacity C3
The inverting input terminal of second operational amplifier U4, the inverting input terminal of second operational amplifier U4 are used to pass through the 4th divider resistance
R11 ground connection.Resistance identical with feedback resistance R12 resistance value is selected as preferably embodiment, a 4th divider resistance R11
Device.
Fig. 8 be a concrete application example power supply output waveform figure, as shown in figure 8, when power supply power-fail output voltage waveforms from
410V drops to 14V, and the first switch end of the first controlled switch 102 is connected with second switch end, linear leadage circuit work, whole
A discharge time is 3.84s, and during discharge, voltage decreasing rate is constant.
Fig. 9 is the power supply output waveform figure of another concrete application example, as shown in figure 9, when power supply zero load, when power supply power-fail
Output voltage waveforms drop to 254V from 411V, and the first switch end of the first controlled switch 102 is connected with second switch end, linearly
Leadage circuit work, entire discharge time are 1.37s, and during discharge, voltage decreasing rate is constant.
The linear leadage circuit of any of the above-described embodiment is opened in the electric current for the power output end that needs to release by receiving
Closing level signal is connected the first switch end of the first controlled switch 102 with second switch end, so that between two output ends of power supply
Form bleed-off circuit；Meanwhile by biasing module 101, it is kept fixed the first end of second switch end and Voltage stabilizing module 100
Voltage difference.Based on this, the first end of Voltage stabilizing module 100 obtains stable voltage, i.e. second switch end according to switch level signal
Voltage, the release electric current of module 103 of electric current fix so that bleed-off circuit is released not by the output voltage of power output end
Influence, electric current release module 103 electric current it is constant so that the output voltage fall off rate of power output end is constant, to improve electricity
The response speed of the output voltage of source output terminal.
The embodiment of the present invention also provides a kind of power-supply system, including power supply and linear leadage circuit；
Linear leadage circuit includes that Voltage stabilizing module, biasing module, the first controlled switch and electric current are released module；
The first switch end of first controlled switch is used to connect an output end of power supply, the second switch of the first controlled switch
The module that is used to release by electric current is held to connect another output end of power supply；
The controlled end of the first controlled switch of steady press bond of Voltage stabilizing module, and second switch is connected by biasing module
End；Wherein, the pressure stabilizing end of Voltage stabilizing module is for accessing switch level signal, and switch level signal is for making the first controlled switch
First switch end is connected with second switch end.
Above-mentioned power-supply system makes the by receiving switch level signal in the electric current for the power output end that needs to release
The first switch end of one controlled switch is connected with second switch end, so as to form bleed-off circuit between two output ends of power supply；Meanwhile
By biasing module, the voltage difference for being kept fixed the pressure stabilizing end of second switch end and Voltage stabilizing module.Based on this, Voltage stabilizing module
Pressure stabilizing end obtains stable voltage according to switch level signal, i.e. the voltage, electric current at second switch end release module electric current it is solid
It is fixed so that releasing for bleed-off circuit is not influenced by the output voltage of power output end, electric current release module electric current it is constant, make
The output voltage fall off rate for obtaining power output end is constant, to improve the response speed of the output voltage of power output end.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
Only several embodiments of the present invention are expressed for above embodiments, and the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (13)
1. a kind of linear leadage circuit, which is characterized in that let out including Voltage stabilizing module, biasing module, the first controlled switch and electric current
Amplification module；
The first switch end of first controlled switch is used to connect an output end of power supply, and the second of first controlled switch
Switch terminals be used for by the electric current release module connection power supply another output end；
The controlled end of first controlled switch described in the steady press bond of the Voltage stabilizing module, and institute is connected by the biasing module
State second switch end；Wherein, the pressure stabilizing end of the Voltage stabilizing module is used for accessing switch level signal, the switch level signal
In the first switch end of first controlled switch is connected with second switch end.
2. linear leadage circuit according to claim 1, which is characterized in that further include the first amplification module；
The first input end of first amplification module connects the pressure stabilizing end of the Voltage stabilizing module, first amplification module it is defeated
Outlet connects the controlled end of the first controlled switch, and the output end of first amplification module passes through described in biasing module connection
Second switch end；Second input terminal of first amplification module connects the second switch end.
3. linear leadage circuit according to claim 2, which is characterized in that first amplification module includes the first operation
Amplifier；
The non-inverting input terminal of first operational amplifier connects the pressure stabilizing end of the Voltage stabilizing module, first operational amplifier
Output end connect the controlled end of the first controlled switch, the output end of first operational amplifier connected by the biasing module
Connect the second switch end；The inverting input terminal of first operational amplifier connects the second switch end.
4. linear leadage circuit according to claim 1, which is characterized in that further include that pull-up module and second controlled open
It closes；
The first switch end of second controlled switch be used for by the pull-up module access preset high level, described second by
The first switch end of control switch is also connected with the pressure stabilizing end of the Voltage stabilizing module；The second switch end of second controlled switch is used for
Ground connection；The controlled end of second controlled switch is for accessing switch level signal.
5. linear leadage circuit according to claim 4, which is characterized in that further include isolation module；
The first end of the side of the isolation module is for accessing default high level；The second end of the side of the isolation module is used
In ground connection, the first end of the side of the isolation module is for accessing switch level signal；
The first end of the other side of the isolation module is for accessing default high level, and the first of the other side of the isolation module
End connects the controlled end of second controlled switch；The second end of the other side of the isolation module.
6. linear leadage circuit according to claim 5, which is characterized in that the isolation module includes photoelectrical coupler；
The anode of the light emitting diode of the photoelectrical coupler is for accessing default high level；Luminous the two of the photoelectrical coupler
The cathode of pole pipe is for being grounded, and the cathode of the light emitting diode of the photoelectrical coupler is for accessing switch level signal；
The collector of the phototriode of the photoelectrical coupler for accessing default high level, the photoelectrical coupler it is photosensitive
The collector of triode connects the controlled end of second controlled switch；The emitter of the phototriode of the photoelectrical coupler
For being grounded.
7. linear leadage circuit according to claim 1, which is characterized in that further include reference voltage judgment module；
The reference voltage judgment module is used to be respectively connected to the output voltage of reference voltage and power supply, the reference voltage judgement
Module is also used to export the switch level signal when the reference voltage is lower than the output voltage of the power supply.
8. linear leadage circuit according to claim 7, which is characterized in that the reference voltage judgment module includes voltage
Hoisting module and comparison module；
The input terminal of the voltage increase module is for accessing reference voltage, and the output end of the voltage increase module is for connecting
The first input end of the comparison module, the second input terminal of the comparison module is used to access the output voltage of power supply, described
The output end of comparison module is for exporting the switch level signal；Wherein, the voltage of the output end of the voltage increase module
Voltage than the input terminal of the voltage increase module is higher by preset voltage value.
9. linear leadage circuit according to claim 8, which is characterized in that the voltage increase module includes the second operation
Amplifier, the first divider resistance, the second divider resistance, third divider resistance, the first filter resistance and the second filter capacitor；
The non-inverting input terminal of the second operational amplifier is used to access the reference voltage by first divider resistance；Institute
The non-inverting input terminal for stating second operational amplifier is used to pass sequentially through second divider resistance and the third divider resistance connects
Enter default high level；
Second divider resistance connect one end of the third divider resistance for respectively by first filter resistance and
The second filter capacitor ground connection.
10. according to claim 1 to linear leadage circuit described in 9 any one, which is characterized in that the Voltage stabilizing module includes
Zener diode；
The cathode of the zener diode is the pressure stabilizing end of the Voltage stabilizing module, and the anode of the zener diode is for being grounded.
11. the linear leadage circuit according to claim 2 to 9 any one, which is characterized in that first controlled switch
Including semiconductor switch, second controlled switch includes semiconductor switch.
12. linear leadage circuit according to claim 11, which is characterized in that first controlled switch includes N-channel
Field-effect tube；
The grid of the N-channel field-effect tube is the controlled end of first controlled switch, the drain electrode of the N-channel field-effect tube
For the first switch end of first controlled switch, the source electrode of the N-channel field-effect tube is the of first controlled switch
Two switch terminals.
13. a kind of power-supply system, which is characterized in that including power supply and linear leadage circuit；
The linear leadage circuit includes that Voltage stabilizing module, biasing module, the first controlled switch and electric current are released module；
The first switch end of first controlled switch is used to connect an output end of the power supply, first controlled switch
The second switch end module that is used to release by the electric current connects another output end of the power supply；
The controlled end of first controlled switch described in the steady press bond of the Voltage stabilizing module, and institute is connected by the biasing module
State second switch end；Wherein, the pressure stabilizing end of the Voltage stabilizing module is used for accessing switch level signal, the switch level signal
In the first switch end of first controlled switch is connected with second switch end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910411079.XA CN110112896A (en) | 2019-05-17 | 2019-05-17 | Linear leadage circuit and power-supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910411079.XA CN110112896A (en) | 2019-05-17 | 2019-05-17 | Linear leadage circuit and power-supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110112896A true CN110112896A (en) | 2019-08-09 |
Family
ID=67490700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910411079.XA Pending CN110112896A (en) | 2019-05-17 | 2019-05-17 | Linear leadage circuit and power-supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110112896A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI790051B (en) * | 2021-12-16 | 2023-01-11 | 應廣科技股份有限公司 | Linear regulator having fast sinking capability |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110157924A1 (en) * | 2009-12-31 | 2011-06-30 | Active-Semi, Inc. | Using output drop detection pulses to achieve fast transient response from a low-power mode |
| EP2469554A2 (en) * | 2010-12-22 | 2012-06-27 | Electronic Systems Protection, Inc. | Hybrid switch circuit |
| CN203522553U (en) * | 2013-10-22 | 2014-04-02 | 北京利德华福电气技术有限公司 | High voltage frequency converter with cooling device |
| CN104300357A (en) * | 2014-09-19 | 2015-01-21 | 江苏骏龙电力科技股份有限公司 | Laser device power control circuit |
| CN104753326A (en) * | 2015-04-09 | 2015-07-01 | 广东工业大学 | AC-DC (alternating current-direct current) drive output filter capacitor quick active leakage circuit |
| CN106787657A (en) * | 2016-12-29 | 2017-05-31 | 上海新时达电气股份有限公司 | Vehicle-mounted drive control device capacitor discharging circuit |
| CN209982332U (en) * | 2019-05-17 | 2020-01-21 | 广州致远电子有限公司 | Linear bleeder circuit and electrical power generating system |
-
2019
- 2019-05-17 CN CN201910411079.XA patent/CN110112896A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110157924A1 (en) * | 2009-12-31 | 2011-06-30 | Active-Semi, Inc. | Using output drop detection pulses to achieve fast transient response from a low-power mode |
| EP2469554A2 (en) * | 2010-12-22 | 2012-06-27 | Electronic Systems Protection, Inc. | Hybrid switch circuit |
| CN203522553U (en) * | 2013-10-22 | 2014-04-02 | 北京利德华福电气技术有限公司 | High voltage frequency converter with cooling device |
| CN104300357A (en) * | 2014-09-19 | 2015-01-21 | 江苏骏龙电力科技股份有限公司 | Laser device power control circuit |
| CN104753326A (en) * | 2015-04-09 | 2015-07-01 | 广东工业大学 | AC-DC (alternating current-direct current) drive output filter capacitor quick active leakage circuit |
| CN106787657A (en) * | 2016-12-29 | 2017-05-31 | 上海新时达电气股份有限公司 | Vehicle-mounted drive control device capacitor discharging circuit |
| CN209982332U (en) * | 2019-05-17 | 2020-01-21 | 广州致远电子有限公司 | Linear bleeder circuit and electrical power generating system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI790051B (en) * | 2021-12-16 | 2023-01-11 | 應廣科技股份有限公司 | Linear regulator having fast sinking capability |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107565684B (en) | Integrated AC detection and power control system for emergency lighting | |
| CN107069927B (en) | Power supply unit and lighting system | |
| CN101917805B (en) | Led drive circuit | |
| CN210038590U (en) | Voltage output circuit and electron cigarette | |
| CN209929968U (en) | Power output bleeder circuit and electrical power generating system | |
| CN110165649A (en) | Power supply exports leadage circuit and power-supply system | |
| CN106322321A (en) | LED illumination down lamp with protection constant current drive | |
| CN109963394A (en) | A kind of flash switch detection circuit and Intelligent lamp | |
| CN107294058A (en) | A kind of overvoltage undervoltage detection circuit applied to solar energy power accumulating power supply | |
| CN107148132B (en) | Single live wire on-state power taking circuit | |
| CN102035370B (en) | Charge pump circuit with current detection function and circuit unit thereof | |
| CN106658838A (en) | Lighting device, control chip, linear dimming system and linear dimming method | |
| CN110112896A (en) | Linear leadage circuit and power-supply system | |
| CN106489303B (en) | The device and method of phase cut power control | |
| CN207083253U (en) | A kind of adaptive fast response circuit and LED drive circuit | |
| CN106505856B (en) | Input voltage auto-adjusting circuit and electronic equipment | |
| CN211831254U (en) | Self-adaptive bleeding control circuit | |
| CN108174488A (en) | A kind of LED protection circuit | |
| CN208707288U (en) | A kind of short-circuit protection circuit | |
| CN107193314A (en) | A kind of constant-current circuit of amplifier output voltage clamper in driving tube threshold voltage | |
| CN204559954U (en) | Automobile room lamp | |
| CN204069439U (en) | Self-inspection LED acousto-optic control lamp | |
| CN205546091U (en) | LED filament lamp dimmer circuit | |
| CN104768263B (en) | Adaptive LED booster driving circuit | |
| CN109066952A (en) | A kind of low consumable electric control circuit, solar controller, solar power system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |