CN206195635U - Controller and adopt switching power supply of this controller - Google Patents
Controller and adopt switching power supply of this controller Download PDFInfo
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- CN206195635U CN206195635U CN201621111462.1U CN201621111462U CN206195635U CN 206195635 U CN206195635 U CN 206195635U CN 201621111462 U CN201621111462 U CN 201621111462U CN 206195635 U CN206195635 U CN 206195635U
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Abstract
The utility model discloses a controller and adopt switching power supply of this controller. The controller includes: delay element holds electric connection with the grid controlled of power tube, including at least one time delay subelement for output delay signal when the power tube switches on, the offset current generation unit generates the subelement including an at least offset current for according to delay signal output offset current, the line voltage compensation unit for first, second input that power tube sample voltage and reference voltage after the offset current compensation imported a comparator respectively will be passed through, perhaps with power tube sample voltage and reference voltage after the offset current compensation input comparator's first, second input respectively, the shutoff of grid control signal with the control power pipe will be generated according to the output signal of comparator. The utility model discloses segment to compensate according to power tube turn -on time, formation and turn -on time are similar to into inverse proportion 's offset current, adjust the peak current who flows through the power tube, realize following hardly line voltage variation's overcurrent protection point.
Description
Technical field
The utility model is related to Switching Power Supply control technology field, more particularly to a kind of suitable for non-isolated AC-DC switches
The controller of the line voltage segmented compensation of power supply and the Switching Power Supply using the controller.
Background technology
For AC-DC power supplys, when ac input voltage changes in the range of 85Vac~265Vac, due to there is comparator
Time delay and power tube shut-off time delay, over-current protection point generally change and change with input line voltage.This change causes high and low line
The over-current protection point of voltage seriously drifts about, and is unfavorable for the uniformity of over-current protection point.Therefore need to be carried out according to not line voltage
Compensation is so as to obtain consistent over-current protection point.
With reference to Fig. 1, existing line voltage compensation schematic diagram.When power tube is turned on, the source voltage of power tube M0
It is pulled near Vbus, FB point voltages are clamped at the source voltage of power tube M0.Because FB point voltage ratios Vout is high, thus it is electric
The upper resistance FBH to Vout flowed through from FB points in feedback divider resistance is flowed, the size of the electric current reflects input line voltage Vline
Height, meanwhile, the electric current flows through metal-oxide-semiconductor M1 by amplifier A1.Flow through metal-oxide-semiconductor M1's by metal-oxide-semiconductor M2, M3 scaled mirror
Electric current produces compensation electric current, by the compensation electric current input line voltage compensation circuit 11, export through the power tube voltage after overcompensation
CS_COMP.Power tube voltage CS_COMP is compared with reference voltage CS_REF by comparator CP1, produces power tube to close
Break signal Gate_off；Cut-off signals Gate_off determines the peak point current for flowing through inductance L0, so as to determine overcurrent protection
Point.
Existing line voltage compensation mode has following defect：
1) the feedback divider resistance that must be made up of lower resistance FBL and upper resistance FBH, for feedback-less divider resistance
The compensation way cannot be just used for so that peripheral applications are limited；
2) range of choice of feedback divider resistance is limited by line voltage compensation；
3) when VCC is powered (such as JFET or depletion type MOS tube by Vbus by the direct voltage of high voltage supply module 13
Deng), the power tube M0 electric currents that upper resistance is flowed through when turning on (usual several mA or tens mA) are provided by VCC, due to VCC be by
Vbus powers, and high current is provided during high pressure can cause that system power dissipation is very big, and efficiency is low.
Utility model content
The purpose of this utility model is, for the defect that existing line voltage compensation mode is present, there is provided one kind control
Device and the Switching Power Supply using the controller, realization are realized little with line voltage by adjusting the peak point current of power tube
The over-current protection point of change.
To achieve the above object, the utility model provides a kind of controller for Switching Power Supply, the controller bag
Include：Delay unit, the grid control end with power tube is electrically connected with, including an at least time delay subelement, for being led in power tube
Time delayed signal is exported when logical；Compensation current generating unit, is electrically connected with the delay unit, including at least one compensation electric current life
Into subelement, for according to time delayed signal output compensation electric current；Line voltage compensation unit, it is single with the compensation electric current generation
Unit is electrically connected with, for will respectively be input into a ratio with reference voltage by the power tube sampled voltage after the compensation current compensation
Compared with the first input end and the second input of device, or by power tube sampled voltage and by the ginseng after the compensation current compensation
First input end and the second input that voltage is input into the comparator respectively are examined, the controller is defeated according to the comparator
Go out signal generation grid control signal to control the conducting and shut-off of the power tube, wherein, when the first input end of comparator
Voltage more than the second input voltage when, power tube shut-off.
To achieve the above object, the utility model additionally provides a kind of Switching Power Supply, and the Switching Power Supply includes this practicality
New described controller.
The utility model has the advantage of：The utility model by when power tube is turned on, according to the rising of ON time
Segmented compensation, the compensation electric current of generation and ON time similar to inversely prroportional relationship are carried out along fragment delay；And compensated with this
Electric current come adjust reference voltage CS_REF or regulation power tube current sampled voltage CS, so as to adjust the peak value for flowing through power tube
Electric current.The over-current protection point little with line voltage change is realized by adjusting peak point current.Opened disclosed in the utility model
The line voltage segmented compensation mode in powered-down source, it is adaptable to AC-DC Switching Power Supplies, is particularly suited for non-isolated AC-DC Switching Power Supplies.
The line voltage compensation mode that the utility model is disclosed, without using outside FB divider resistances, for periphery without FB divider resistances
Using being particularly suitable for；Further, since the electric current without milliampere level flows out from VCC, therefore it is also particularly suitable for JFET or Depletion
The Switching Power Supply of the high voltage supplies such as MOS, system effectiveness and power consumption are not influenceed.
Brief description of the drawings
Fig. 1, existing line voltage compensation schematic diagram.
Fig. 2, the configuration diagram shown in the embodiment of Switching Power Supply described in the utility model；
Fig. 3 is not line voltage or the corresponding compensation current waveform figure of ON time in embodiment described in Fig. 2；
Fig. 4, the configuration diagram shown in another embodiment of Switching Power Supply described in the utility model.
Specific embodiment
The controller that there is provided the utility model below in conjunction with the accompanying drawings and done in detail using the Switching Power Supply of the controller
Explanation.
With reference to Fig. 2, the configuration diagram shown in the embodiment of Switching Power Supply described in the utility model.Fig. 2 is one
High-side buck Switching Power Supplies, alternating current input AC-IN is filtered by four diode D1~D4 rectifications and an electric capacity C0
Ripple obtains DC voltage Vbus；Power tube M0, inductance L0, sustained diode 0 and output capacitance Cout composition are typical
High-side buck Switching Power Supplies topology.It is noted here that the utility model is not limited in high-side buck opening
Powered-down source, and apply to the Switching Power Supply of any topology.The source electrode of the power tube M0 of described Switching Power Supply passes through inductance L0
It is electrically connected to the DC voltage input that the voltage output end Vout of the Switching Power Supply, drain electrode are electrically connected with the Switching Power Supply
End Vbus；Described Switching Power Supply also includes controller, and the controller is used to adjust the line voltage of Switching Power Supply.The control
Device includes：Delay unit 21, compensation current generating unit 22 and line voltage compensation unit 23.
Delay unit 21, the grid control end Gate with power tube M0 is electrically connected with, including an at least time delay subelement, uses
In the output time delayed signal Gate_D when power tube M0 is turned on.
In the present embodiment, the delay unit 21 includes 3 time delay subelements 211~213, the compensation electric current generation
Unit 22 includes 3 compensation electric current generation subelements；When power tube M0 is turned on, the output of the first time delay subelement 211 first is prolonged
When signal Gate_D1 to first compensation electric current generation subelement, the second time delay subelement 212 export the second time delayed signal Gate_
The compensation electric current generation subelements of D2 to second, the 3rd time delay subelement 213 exports the 3rd time delayed signal Gate_D3 to the 3rd compensation
Electric current generates subelement；Wherein, the delay time of the second time delayed signal Gate_D2 is more than first time delayed signal
The delay time of Gate_D1, the delay time of the 3rd time delayed signal Gate_D3 is more than the second time delayed signal Gate_
The delay time of D2, so as to realize carrying out segmented compensation to the line voltage of Switching Power Supply.
Compensation current generating unit 22, is electrically connected with the delay unit 21, including at least one compensation electric current generation
Unit, for according to time delayed signal Gate_D output compensation electric currents Icomp.
Wherein, the quantity of the time delay subelement is identical with the quantity of the compensation electric current generation subelement, the compensation
Electric current generates subelement and the time delay subelement and corresponds and is electrically connected with, the compensation electric current generation subelement according to its
The time delayed signal output compensation electron current of the time delay subelement output of electric connection, all compensation electric current generation subelements are defeated
The compensation electron current for going out is aggregated into the compensation electric current Icomp.Wherein, the output size of the compensation electric current Icomp with it is described
Into approximate inversely prroportional relationship, the output size of the compensation electric current Icomp and line voltage are into approximate for the ON time of power tube M0
Proportional relationship.
In the present embodiment, each compensation electric current generation subelement includes an a bias current sources I and switching tube S；
Described bias current sources I one end is electrically connected with the VCC power supplys of the Switching Power Supply, and the other end is electrically connected with the switching tube S's
One end；The control end of the switching tube S is electrically connected with corresponding delay subelement, and the other end is single as compensation electric current generation
The output end of unit；The time delayed signal conducting that the switching tube S is exported according to the time delay subelement, so that the bias current sources
Output end output conduct compensation electron current of the electric current of I from the compensation electric current generation subelement.All compensation electric current lifes
Output end into subelement is electrically connected with the source electrode of the power tube M0 by an electric capacity C1.
Preferably, the controller further includes a current mirror mirror image unit 24, and the compensation electric current Icomp is through described
Exported after the mirror image of current mirror mirror image unit 24 to the line voltage compensation unit 23.
In the present embodiment, the current mirror mirror image unit 24 includes the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor of common gate
The 3rd metal-oxide-semiconductor M3 and the 4th metal-oxide-semiconductor M4 of M2, common gate；Wherein, M1 and M2 are using the MOS with power tube M0 same types
Pipe, for example, be N-type metal-oxide-semiconductor, M3 and M4 use with the different types of metal-oxide-semiconductors of power tube M0, be for example p-type metal-oxide-semiconductor.Institute
State the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 with the power tube M0 common sources, the first metal-oxide-semiconductor M1 drain electrode electricity
Property the connection compensation current generating unit output end, the drain electrode of the second metal-oxide-semiconductor M2 is electrically connected with the 3rd metal-oxide-semiconductor
The drain electrode of M3；The source electrode of the 3rd metal-oxide-semiconductor M3 and the source electrode of the 4th metal-oxide-semiconductor M4 are electrically connected with the VCC of Switching Power Supply
Power supply, the drain electrode of the 4th metal-oxide-semiconductor M4 is used as compensation current output terminal；The compensation electricity of the compensation current generating unit output
Stream Icomp from the drain electrode of the 4th metal-oxide-semiconductor M4 after the mirror image of current mirror mirror image unit 24 by exporting.
Line voltage compensation unit 23, is electrically connected with, for will be by the compensation with the compensation current generating unit 22
Power tube sampled voltage CS_COMP and reference voltage CS_REF after electric current Icomp compensation are input into the of a comparator CP1 respectively
One input and the second input, the controller generate grid control according to the output signal Gate_off of the comparator CP1
Signal Gate processed is controlling the conducting of the power tube M0 with shut-off.Wherein, when the voltage of the first input end of comparator CP1 is big
When the voltage of the second input, the power tube M0 shut-offs.
The electric current that the line voltage compensation unit 23 pairs flows through the power tube M0 is sampled, and according to the sampling for obtaining
Electric current produces power tube sampled voltage CS；The line voltage compensation unit 23 is by by after the compensation electric current Icomp compensation
Power tube sampled voltage CS_COMP and reference voltage CS_REF is input into the first input end and second of the comparator CP1 respectively
Input.
In the present embodiment, the line voltage compensation unit 23 includes power tube current sampling module 231, power tube current
Sampling resistor R1 and compensation current sampling resistor R2, the power tube current sampling resistor R1 and the compensation current sample electricity
Resistance R2 series connection.The electric current that the power tube current sampling module 231 pairs flows through the power tube M0 is sampled, the sampling of acquisition
Electric current flows through the power tube current sampling resistor R1, produces power tube sampled voltage CS；The compensation current generating unit 22
The compensation electric current Icomp of output flows through the compensation current sampling resistor R2, produces offset voltage to be sampled with to the power tube
Voltage CS is compensated, and produces the signal CS_COMP for changing and changing with line voltage Vline (i.e. by the compensation electric current
Power tube sampled voltage CS_COMP after Icomp compensation) it is input into the first input end of the comparator CP1；Reference voltage CS_
REF is input into second input of the comparator CP1.Controller generates grid control according to the output signal of the comparator CP1
Signal processed is controlling the shut-off of the power tube M0.Wherein, when the voltage of the first input end of comparator CP1 is input into more than second
During the voltage at end, the output Gate_off signals of comparator CP1 are turned off with controlling the power tube M0.
Below in conjunction with Fig. 2-Fig. 3, operation principle of the present utility model is illustrated, wherein, Fig. 3 is to implement described in Fig. 2
Not corresponding compensation current waveform figures of line voltage Vline or ON time Gate in example.
Three compensation electric current generation subelements of three groups of bias current sources and switching tube composition, but this reality are shown in Fig. 2
Only three groups bias current sources and switching tube are not limited to new, can less or more group bias current sources and switching tube；Open
Close pipe to be realized using metal-oxide-semiconductor, it would however also be possible to employ the transistor such as diode, triode is realized.Gate is the grid control of power tube M0
Signal processed, Gate be input into three time delay subelements 211~213 after export respectively corresponding delay signal Gate_D1, Gate_D2 and
Gate_D3.The high level time (i.e. delay time) of Gate_D2 is more long than Gate_D1, and Gate_D3 high level times compare Gate_D2
Long, waveform is as shown in Figure 3.Time delayed signal Gate_D1 controlling switches S1, when Gate_D1 is high, switch S1 is opened, bias current
Current direction the first metal-oxide-semiconductor M1 of source I1 is used as the first compensation electron current；Gate_D2 controlling switches S2, when Gate_D2 is high,
Switch S2 is opened, and current direction the first metal-oxide-semiconductor M1 of bias current sources I2 is used as the second compensation electron current；Gate_D3 controls are opened
S3 is closed, when Gate_D3 is high, switch S3 is opened, current direction the first metal-oxide-semiconductor M1 of bias current sources I3 is used as the 3rd compensation
Electric current.With reference to Fig. 3, during T1, I1, I2 and I3 flow to M1；During T2, only I2 and I3 flow to M1；During T3, only I3
Flow to M1；During T4, there is no current direction M1.
The electric current of M1 is flowed through by after M2 current mirrors, then when being obtained after M3, M4 current mirror with Gate high level
Between change and change stepped compensation electric current Icomp.Delay time and bias current are rationally set so that compensation electric current
The ON time of Icomp and power tube M0 similar to inversely prroportional relationship, so as to obtain the benefit with line voltage Vline into approximate direct ratios
Repay electric current Icomp.The waveform of line voltage Vline or the corresponding compensation electric current Icomp of ON time is not as shown in Figure 3.Fig. 3
In, CS_COMP is the power tube sampled voltage that compensated electric current Icomp was compensated, and Idriain is the electricity for flowing through power tube drain electrode
Stream；As can be seen that flow through the peak point current Ipk of power tube by compensating electric current and adjusting, can be with through the peak point current Ipk of overcompensation
Obtain relatively uniform over-current protection point.
231 pairs of electric currents for flowing through power tube M0 of power tube current sampling module are sampled, and the sample rate current of acquisition is flowed through
Power tube current sampling resistor R1, produces power tube sampled voltage CS；Compensation electric current Icomp flows through compensation current sampling resistor
R2, produces offset voltage to be compensated with to the power tube sampled voltage CS, produces what is changed and change with line voltage Vline
Signal CS_COMP；CS_COMP and reference voltage CS_REF compare, and when CS_COMP is more than CS_REF, produce power tube shut-off
Signal Gate_off, then obtains through the power tube peak point current of overcompensation.Line voltage Vline is higher, and Icomp is bigger, CS_
COMP is higher, power tube cut-off signals just in advance it is more.Time delay (Td) is turned off by comparator time delay and power tube caused
Peak point current overshoot is compensated.Relatively uniform excessively stream can be obtained under not line voltage through the peak point current of overcompensation to protect
Shield point.
The utility model is by the way that when power tube is turned on, the rising edge fragment delay according to ON time carries out segmentation benefit
Repay, the compensation electric current of generation and ON time similar to inversely prroportional relationship；And flow through power tube to adjust with this compensation electric current
Peak point current.Because ON time is influenceed by line voltage, compensate current controlled in ON time, that is, be controlled by line indirectly
Voltage.Line voltage is higher, and ON time is shorter, and compensation electric current is bigger；Conversely, line voltage is lower, ON time is more long, compensation electricity
Stream is smaller.Thus obtain through the relatively small over-current protection point of the change of line voltage compensation.The disclosed switch electricity of the utility model
The line voltage segmented compensation mode in source, it is adaptable to AC-DC Switching Power Supplies, is particularly suited for non-isolated AC-DC Switching Power Supplies.This reality
With the line voltage compensation mode of new disclosure, without using outside FB divider resistances, for application of the periphery without FB divider resistances
It is particularly suitable for；Further, since the electric current without milliampere level flows out from VCC, therefore it is also particularly suitable for JFET or Depletion MOS etc.
The Switching Power Supply of high voltage supply, system effectiveness and power consumption are not influenceed.
With reference to Fig. 4, the configuration diagram shown in another embodiment of Switching Power Supply described in the utility model.With shown in Fig. 2
The difference of embodiment is：Line voltage compensation unit 43, power tube sampled voltage CS is mended with through overcompensation electric current Icomp
The first input end and the second input of the reference voltage CS_REF difference input comparators CP1 after repaying.That is, the present embodiment
In, compensation electric current Icomp is used for compensating reference voltage CS_REF, rather than power tube sampled voltage CS.And, the benefit in the present embodiment
The Icomp compensation senses of current repaid in electric current Icomp and embodiment illustrated in fig. 2 are opposite.
Specially：The electric current that the line voltage compensation unit 43 pairs flows through the power tube M0 is sampled, and according to obtaining
The sample rate current for taking produces power tube sampled voltage CS；The line voltage compensation unit 43 is by power tube sampled voltage CS and passes through
Reference voltage CS_REF after the compensation electric current Icomp compensation is input into the first input end and the of the comparator CP1 respectively
Two inputs.
In the present embodiment, the controller further includes current mirror mirror image unit 44.The current mirror mirror image unit 44
The first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 including common gate, wherein, M1 and M2 is using the MOS with power tube M0 same types
Pipe, for example, be N-type metal-oxide-semiconductor.The first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 with the power tube M0 common sources, institute
The drain electrode for stating the first metal-oxide-semiconductor M1 is electrically connected with the output end of the compensation current generating unit, the drain electrode of the second metal-oxide-semiconductor M2
As compensation current output terminal；The compensation electric current Icomp of the compensation current generating unit output is by the current mirror mirror image
Exported from the drain electrode of the second metal-oxide-semiconductor M2 after the mirror image of unit 44.Compensation electric current Icomp in the present embodiment is current mirror mirror image
The sink electric currents of the output of unit 44, compensation electric current Icomp in embodiment illustrated in fig. 2 is exported for current mirror mirror image unit 24
Source electric currents.
In the present embodiment, the line voltage compensation unit 43 includes power tube current sampling module 431, power tube current
Sampling resistor R1, reference voltage source VREF and compensation current sampling resistor R2.431 pairs of institutes of the power tube current sampling module
The electric current for stating power tube M0 is sampled, and the sample rate current of acquisition flows through the power tube current sampling resistor R1, produces power
Pipe sampled voltage CS；The compensation electric current Icomp of the compensation output of current generating unit 42 flows through the compensation current sampling resistor R2,
Offset voltage is produced to be compensated with the reference voltage CS_REF to the reference voltage source VREF；The line voltage compensation unit
43 by power tube sampled voltage CS be input into respectively by the reference voltage CS_REF after the compensation electric current Icomp compensation it is described
The first input end of comparator CP1 and the second input.The first input end of power tube sampled voltage CS input comparators CP1；
Second input of the reference voltage CS_REF input comparators CP1 after compensation.Output signal of the controller according to comparator CP1
Grid control signal is generated to control the conducting and shut-off of the power tube M0.Wherein, when the first input end of comparator CP1
Voltage more than the second input voltage when, the output Gate_off signals of comparator CP1 are turned off with controlling the power tube M0.
In the present embodiment, the line voltage compensation unit 43 further includes reference voltage divider resistance R3, R4, described
Reference voltage divider resistance R3, R4 connects R2 with the compensation current sampling resistor；The buffered devices of reference voltage source VREF
Reference voltage is produced after reference voltage divider resistance R3, R4 partial pressure again after BF1 bufferings.It is proportional with line voltage Vline
After compensation electric current Icomp is produced, R3 and R4 is flowed through；Line voltage Vline is higher, and Icomp is bigger, and CS_REF voltages are higher, work(
Rate pipe cut-off signals in advance it is more.So that height line voltage obtains consistent peak point current and over-current protection point.
The rising edge fragment delay that the utility model passes through ON time, produces and ON time is similar to inversely prroportional relationship
Compensation electric current；The utility model adjusts reference voltage CS_REF or regulation current sample voltage with the compensation electric current of generation
CS, so as to adjust peak point current.The utility model realizes the excessively stream little with line voltage change by adjusting peak point current
Protection point.
The utility model additionally provides a kind of line voltage compensation method, described using controller described in the utility model
Line voltage compensation method include step：The unit output time delayed signal when power tube conduction delay；Compensation current generating unit
According to time delayed signal output compensation electric current；Power tube sampled voltage is compensated by the compensation electric current, and will be through
The first input end of power tube sampled voltage and reference voltage the difference input comparator crossed after the compensation current compensation and the
Two inputs, or reference voltage is compensated by the compensation electric current, and by power tube sampled voltage and by described
Reference voltage after compensation current compensation distinguishes the first input end and the second input of input comparator；When the comparator
When the voltage of first input end is more than the voltage of the second input, the power tube shut-off is controlled.
Wherein, the output size of the compensation electric current and the ON time of the power tube into approximate inversely prroportional relationship.By
Influenceed by line voltage in ON time, compensated current controlled in ON time, that is, be controlled by line voltage indirectly.Line voltage is got over
Height, ON time is shorter, and compensation electric current is bigger；Conversely, line voltage is lower, ON time is more long, and compensation electric current is smaller.Thus
To the relatively small over-current protection point of the change through line voltage compensation.
Used as preferred embodiment, when power tube conduction delay, unit output time delayed signal is further included：Using
Multiple time delay subelement output multi-channel time delayed signals, the delay time of multi-channel time-delay signal is differed.
Used as preferred embodiment, the quantity of the time delay subelement generates the quantity of subelement with the compensation electric current
Identical, the compensation electric current generation subelement is corresponded with the time delay subelement and is electrically connected with.Described line voltage compensation
In method, when power tube conduction delay, unit output time delayed signal is further included：The compensation electric current generation subelement root
The time delayed signal output compensation electron current exported according to the time delay subelement being electrically connected, all compensation electric current generation
The compensation electron current of unit output is aggregated into the compensation electric current.
The above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
Art personnel, on the premise of the utility model principle is not departed from, can also make some improvements and modifications, these improvements and modifications
Also should be regarded as protection domain of the present utility model.
Claims (14)
1. a kind of controller for Switching Power Supply, it is characterised in that the controller includes：
Delay unit, the grid control end with power tube is electrically connected with, including an at least time delay subelement, for being led in power tube
Time delayed signal is exported when logical；
Compensation current generating unit, is electrically connected with the delay unit, including at least one compensation electric current generation subelement, is used for
According to time delayed signal output compensation electric current；
Line voltage compensation unit, is electrically connected with, for will be by the compensation current compensation with the compensation current generating unit
Rear power tube sampled voltage is input into the first input end and the second input of a comparator with reference voltage respectively, or by work(
Rate pipe sampled voltage and the first input end for being input into the comparator respectively by the reference voltage after the compensation current compensation
With the second input, the controller generates grid control signal controlling the power according to the output signal of the comparator
The shut-off of pipe, wherein, when the voltage of the first input end of comparator is more than the voltage of the second input, the power tube is closed
It is disconnected.
2. controller according to claim 1, it is characterised in that the quantity of the time delay subelement and the compensation electric current
The quantity for generating subelement is identical, and the compensation electric current generation subelement is corresponded with the time delay subelement and is electrically connected with,
The time delayed signal output compensation son electricity that the compensation electric current generation subelement is exported according to the time delay subelement being electrically connected
Stream, the compensation electron current of all compensation electric current generation subelement outputs is aggregated into the compensation electric current.
3. controller according to claim 2, it is characterised in that the output size of the compensation electric current and the power tube
ON time into approximate inversely prroportional relationship.
4. controller according to claim 2, it is characterised in that the delay unit includes 3 time delay subelements, described
Compensation current generating unit includes 3 compensation electric current generation subelements；When power tube is turned on, the first time delay subelement output the
One time delayed signal to the first compensation electric current generation subelement, the second time delay subelement exports the second time delayed signal to the second compensation electricity
Stream generation subelement, the 3rd time delay subelement exports the 3rd time delayed signal to the 3rd compensation electric current generation subelement；
Wherein, more than the delay time of first time delayed signal, the described 3rd prolongs the delay time of second time delayed signal
When signal delay time more than second time delayed signal delay time, so as to realize carrying out the line voltage of Switching Power Supply
Segmented compensation.
5. controller according to claim 1, it is characterised in that each compensation electric current generation subelement includes that is inclined
Put current source and a switching tube；
Described bias current sources one end is electrically connected with the VCC power supplys of the Switching Power Supply, and the other end is electrically connected with the switching tube
One end；
The control end of the switching tube is electrically connected with corresponding delay subelement, and the other end is used as the compensation electric current generation subelement
Output end；
The time delayed signal conducting that the switching tube is exported according to the time delay subelement so that the electric current of the bias current sources from
The output end output of the compensation electric current generation subelement is used as compensation electron current.
6. controller according to claim 1, it is characterised in that the controller further includes a current mirror mirror image list
Unit, the compensation electric current is exported to the line voltage compensation unit after the current mirror mirror image unit mirror image.
7. controller according to claim 6, it is characterised in that the current mirror mirror image unit includes the first of common gate
Metal-oxide-semiconductor and the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor of common gate；
First metal-oxide-semiconductor and second metal-oxide-semiconductor with the power tube common source, the drain electrode of first metal-oxide-semiconductor is electrical
The output end of the connection compensation current generating unit, the drain electrode of second metal-oxide-semiconductor is electrically connected with the leakage of the 3rd metal-oxide-semiconductor
Pole；
The source electrode of the 3rd metal-oxide-semiconductor and the source electrode of the 4th metal-oxide-semiconductor are electrically connected with the VCC power supplys of Switching Power Supply, described
The drain electrode of the 4th metal-oxide-semiconductor is used as compensation current output terminal；
It is described compensation current generating unit output compensation electric current by after the current mirror mirror image unit mirror image from the described 4th
The drain electrode output of metal-oxide-semiconductor.
8. controller according to claim 7, it is characterised in that the line voltage compensation cellular convection is through the power tube
Electric current sampled, and power tube sampled voltage is produced according to the sample rate current for obtaining, the line voltage compensation unit will be through
The power tube sampled voltage crossed after the compensation current compensation is input into the first input end of the comparator with reference voltage respectively
With the second input.
9. controller according to claim 8, it is characterised in that the line voltage compensation unit is adopted including power tube current
Egf block, power tube current sampling resistor and compensation current sampling resistor, the power tube current sampling resistor and the benefit
Repay current sampling resistor series connection；
The power tube current sampling module is sampled to the electric current for flowing through the power tube, and the sample rate current of acquisition flows through institute
Power tube current sampling resistor is stated, power tube sampled voltage is produced；
The compensation electric current of the compensation current generating unit output flows through the compensation current sampling resistor, produce offset voltage with
The power tube sampled voltage is compensated；
The line voltage compensation unit will be distinguished by the power tube sampled voltage after the compensation current compensation with reference voltage
It is input into the first input end and the second input of the comparator.
10. controller according to claim 6, it is characterised in that the current mirror mirror image unit includes the of common gate
One metal-oxide-semiconductor and the second metal-oxide-semiconductor；
First metal-oxide-semiconductor and second metal-oxide-semiconductor with the power tube common source, the drain electrode of first metal-oxide-semiconductor is electrical
The output end of the connection compensation current generating unit, the drain electrode of second metal-oxide-semiconductor is used as compensation current output terminal；
It is described compensation current generating unit output compensation electric current by after the current mirror mirror image unit mirror image from described second
The drain electrode output of metal-oxide-semiconductor.
11. controllers according to claim 10, it is characterised in that the line voltage compensation cellular convection is through the power
The electric current of pipe is sampled, and produces power tube sampled voltage according to the sample rate current for obtaining, and the line voltage compensation unit will
Power tube sampled voltage and the first input for being input into the comparator respectively by the reference voltage after the compensation current compensation
End and the second input.
12. controllers according to claim 11, it is characterised in that the line voltage compensation unit includes power tube current
Sampling module, power tube current sampling resistor, reference voltage source and compensation current sampling resistor；
The power tube current sampling module is sampled to the electric current of the power tube, and the sample rate current of acquisition flows through the work(
Rate tube current sampling resistor, produces power tube sampled voltage；
The compensation electric current of the compensation current generating unit output flows through the compensation current sampling resistor, produce offset voltage with
Reference voltage to the reference voltage source is compensated；
The line voltage compensation unit distinguishes power tube sampled voltage with by the reference voltage after the compensation current compensation
It is input into the first input end and the second input of the comparator.
13. controllers according to claim 12, it is characterised in that the line voltage compensation unit further includes reference
Voltage resistance, the reference voltage divider resistance is connected with the compensation current sampling resistor；The reference voltage source warp
Reference voltage is produced after the reference voltage divider resistance partial pressure.
14. a kind of Switching Power Supplies, it is characterised in that the Switching Power Supply is included as any one of claim 1 to 13
Controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621111462.1U CN206195635U (en) | 2016-10-10 | 2016-10-10 | Controller and adopt switching power supply of this controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621111462.1U CN206195635U (en) | 2016-10-10 | 2016-10-10 | Controller and adopt switching power supply of this controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206195635U true CN206195635U (en) | 2017-05-24 |
Family
ID=58730741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621111462.1U Withdrawn - After Issue CN206195635U (en) | 2016-10-10 | 2016-10-10 | Controller and adopt switching power supply of this controller |
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| Country | Link |
|---|---|
| CN (1) | CN206195635U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487248A (en) * | 2016-10-10 | 2017-03-08 | 上海晶丰明源半导体有限公司 | Controller, Switching Power Supply and line voltage compensation method |
| CN107172764A (en) * | 2017-07-12 | 2017-09-15 | 上海晶丰明源半导体股份有限公司 | Input current limliting module, linear constant current system and method |
| CN107770913A (en) * | 2017-11-02 | 2018-03-06 | 中国科学院半导体研究所 | A kind of protection circuit for preventing metal-oxide-semiconductor from overloading |
| CN109391163A (en) * | 2018-11-13 | 2019-02-26 | 深圳创维－Rgb电子有限公司 | A kind of LLC Switching Power Supply and display device |
| CN114447898A (en) * | 2022-01-26 | 2022-05-06 | 苏州纳芯微电子股份有限公司 | Current limiting circuit and electric equipment with same |
-
2016
- 2016-10-10 CN CN201621111462.1U patent/CN206195635U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487248A (en) * | 2016-10-10 | 2017-03-08 | 上海晶丰明源半导体有限公司 | Controller, Switching Power Supply and line voltage compensation method |
| CN106487248B (en) * | 2016-10-10 | 2019-01-29 | 上海晶丰明源半导体股份有限公司 | Controller, Switching Power Supply and line voltage compensation method |
| CN107172764A (en) * | 2017-07-12 | 2017-09-15 | 上海晶丰明源半导体股份有限公司 | Input current limliting module, linear constant current system and method |
| CN107172764B (en) * | 2017-07-12 | 2019-06-11 | 上海晶丰明源半导体股份有限公司 | Input current limliting module, linear constant current system and method |
| CN107770913A (en) * | 2017-11-02 | 2018-03-06 | 中国科学院半导体研究所 | A kind of protection circuit for preventing metal-oxide-semiconductor from overloading |
| CN107770913B (en) * | 2017-11-02 | 2020-03-17 | 中国科学院半导体研究所 | Protection circuit for preventing MOS tube from overloading |
| CN109391163A (en) * | 2018-11-13 | 2019-02-26 | 深圳创维－Rgb电子有限公司 | A kind of LLC Switching Power Supply and display device |
| CN114447898A (en) * | 2022-01-26 | 2022-05-06 | 苏州纳芯微电子股份有限公司 | Current limiting circuit and electric equipment with same |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170524 Effective date of abandoning: 20190129 |