CN110212765A - A kind of power supply and its power circuit - Google Patents
A kind of power supply and its power circuit Download PDFInfo
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- CN110212765A CN110212765A CN201810166572.5A CN201810166572A CN110212765A CN 110212765 A CN110212765 A CN 110212765A CN 201810166572 A CN201810166572 A CN 201810166572A CN 110212765 A CN110212765 A CN 110212765A
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- switch element
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
The invention belongs to power technique fields, a kind of power supply and its power circuit are provided.In the present invention, by using including remained capacity current generating unit, current-voltage converting unit, multiple-stage filtering unit, the compensation current generating module of Voltage-current conversion unit and current lens unit, so that the error amplification voltage that remained capacity current generating unit is exported according to control chip generates remained capacity electric current, current-voltage converting unit is converted into remained capacity voltage, multiple-stage filtering unit is filtered remained capacity voltage, by treated, remained capacity voltage is converted to the first electric current to Voltage-current conversion unit, current lens unit exports after generating compensation electric current according to first electric current, so that voltage changing module generates offset voltage according to compensation electric current, so that turn-on frequency and the time of feedback voltage and offset voltage control power tube that control chip is exported according to voltage changing module, so that electric The output voltage stabilization of source circuit, and precision is high.
Description
Technical field
The invention belongs to power technique fields more particularly to a kind of power supplys and its power circuit.
Background technique
As the device to various power supply for electrical equipment, the importance of power supply is self-evident.Currently, the prior art is used
Power circuit be mainly typical inverse-excitation type switch power-supply application circuit figure shown in FIG. 1, the course of work is: firstly, input
Alternating current be converted to direct current signal after the full-wave rectification of diode D1~D4 and the filtering of capacitor C11.
Later, on the one hand the direct current signal charges to capacitor C12 by start-up resistor R11, the electricity on capacitor C12
After pressure reaches the starting voltage of control chip IC, control chip IC is started to work；On the other hand, which is become by switch
Depressor is transformed into AC signal, and the current switch variation in switch transformer mainly controls power switch by control chip IC
The Push And Release of pipe Q1 is realized, and when power switch tube Q1 conducting, which works as power to the armature winding of transformer
When switching tube Q1 is disconnected, the voltage on primary winding is transmitted to secondary windings, so that energy of the secondary windings according to transmitting
Output voltage is measured, with to power supply for electrical equipment.Wherein, control chip IC is by assisting end voltage to adopt switch transformer primary side
Sample realizes the sampling to output end voltage, and controls transformation with turn-on time by the switching frequency of control power switch tube Q1
The size of electric current, finally makes output end voltage constant in device primary side.
Although its pressure stabilizing adjusting is mainly however, existing power circuit can carry out pressure stabilizing to output end voltage
It is adjusted for variable of load (Load), and in practical applications, it is long as the specification of power takeoff leads is different
Degree is different, and the resistance on output lead can be very big, therefore output lead can consume certain voltage, therefore when power circuit output connects
When being connected to the electricity consumption port of mobile phone or other application equipment, output voltage can be relatively low, it is therefore desirable to which line pressure compensation is existing to be promoted
There is the defect of power circuit output voltage, and existing line pressure compensation is easy to bring the problem of output voltage shakiness.
Summary of the invention
The purpose of the present invention is to provide a kind of power supply and its power circuits, it is intended to solve existing power circuit and introduce line
There is a problem of that output end voltage is unstable after pressure compensation, and improves the precision of output voltage.
The invention is realized in this way a kind of power circuit, connects with load, the power circuit includes rectifier bridge, becomes
Die block, power switch tube and control chip, the rectifier bridge connect with the voltage changing module, the voltage changing module with it is described
Power switch tube, the control chip and load connection, the control chip is connect with the power switch tube, described
Power circuit further includes compensation current generating module, and the compensation current generating module includes:
Remained capacity current generating unit is connect with the control chip, for receiving the mistake of the control chip output
Difference amplification voltage, and voltage is amplified according to the error and generates remained capacity electric current；
Current-voltage converting unit is connect with the remained capacity current generating unit, for the remained capacity is electric
Circulation is changed to remained capacity voltage；
Multiple-stage filtering unit connect with the current-voltage converting unit, and receives clock signal, for when described
Multiple-stage filtering processing is carried out to the remained capacity voltage under the action of clock signal；
Voltage-current conversion unit connect with the multiple-stage filtering unit, and receives enable signal, for making described
When energy invalidating signal, the remained capacity voltage after filtering processing is converted into the first electric current；
Current lens unit is connect with the Voltage-current conversion unit, the control chip and the voltage changing module,
For generating compensation electric current according to first electric current, and the compensation electric current is exported to the voltage changing module, makes the change
Output is to the control chip after die block generates offset voltage according to the compensation electric current, in order to the control chip according to
The feedback voltage and offset voltage of the voltage changing module output control turn-on frequency and the time of the power switch tube.
Another object of the present invention is to provide a kind of power supply, the power supply includes above-mentioned power circuit.
In the present invention, by using including remained capacity current generating unit, current-voltage converting unit, multistage filter
The compensation current generating module of wave unit, Voltage-current conversion unit and current lens unit, so that remained capacity electric current generates
Unit generates remained capacity electric current according to the error amplification voltage of control chip output, and current-voltage converting unit is by the load
Identification electric current is converted to remained capacity voltage, and multiple-stage filtering unit carries out multiple-stage filtering processing, electric piezo-electric to remained capacity voltage
Remained capacity voltage after filtering processing is converted to the first electric current by stream-converting unit, and current lens unit is produced according to first electric current
Raw compensation electric current, and compensation electric current is exported to voltage changing module, so that voltage changing module generates offset voltage according to compensation electric current, into
And make the turn-on frequency and the time that control feedback voltage and offset voltage control power tube that chip is exported according to voltage changing module.
Since the error amplification voltage of control chip output is obtained according to the output end voltage of power circuit, according to the error
The obtained compensation electric current of amplification voltage can reflect the variation of load current, so can pressure drop to power takeoff leads into
Row compensation so that power circuit output end voltage stablize, while using multiple-stage filtering unit to remained capacity voltage into
The processing of row multiple-stage filtering, can effectively improve the precision of the first electric current obtained according to remained capacity voltage, and then improve compensation
The precision of voltage, so that it is unstable to solve the problems, such as after existing power circuit introduces line pressure compensation that there are output end voltages, and
Improve the precision of output voltage.
Detailed description of the invention
Fig. 1 is the electrical block diagram for the power circuit that the prior art provides；
Fig. 2 is the modular structure schematic diagram of power circuit provided by one embodiment of the invention；
Fig. 3 is the modular structure schematic diagram of the control chip in power circuit provided by one embodiment of the invention；
Fig. 4 is the circuit structure signal of the compensation current generating module in power circuit provided by one embodiment of the invention
Figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Realization of the invention is described in detail below in conjunction with specific attached drawing:
Fig. 2 shows the modular structures of power circuit provided by one embodiment of the invention, for ease of description, only show
Part related to the present embodiment, details are as follows:
As shown in Fig. 2, power circuit 1 provided by the embodiment of the present invention is connect with load (not shown) comprising
Rectifier bridge 10, voltage changing module 20, power switch tube Q1, control chip 30 and compensation current generating module 40, and compensate electricity
Flow generation module 40 include remained capacity current generating unit 401, current-voltage converting unit 402, multiple-stage filtering unit 403,
Voltage-current conversion unit 404 and mirror image unit 405.
Wherein, rectifier bridge 10 is connect with voltage changing module 20, voltage changing module 20 and power switch tube Q1, control chip 30 and
Load connection, control chip 30 are connect with power switch tube Q1, and remained capacity current generating unit 401 and control chip 30 connect
It connects, current-voltage converting unit 402 is connect with remained capacity current generating unit 401, multiple-stage filtering unit 403 and electric current-electricity
Converting unit 402 is pressed to connect, Voltage-current conversion unit 404 is connect with multiple-stage filtering unit 403, mirror image unit 405 and electricity
Piezo-electric stream-converting unit 404, control chip 30 and voltage changing module 20 connect.
It specifically, rectifier bridge 10 receives alternating current, and is output after direct current to voltage changing module 20 by AC rectification.
The armature winding of voltage changing module 20 power switch tube Q1 be connected when according to the direct current carry out energy stores, and
By the energy transmission of storage to secondary windings when power switch tube Q1 is disconnected, secondary windings starts to disappear to the energy of transmitting
Magnetic, i.e. secondary windings provide output voltage VO UT to load according to the energy of transmitting, to charge to load；It should be noted that
In embodiments of the present invention, voltage changing module 20 refers to including transformer and diode D6, secondary diode D7, capacitor C17, electricity
The structure including R6, resistance R7 and resistance 12 is hindered, and the specific work process of the structure can refer to the prior art, herein no longer
It repeats；In addition, power circuit provided in an embodiment of the present invention further includes the filter being made of inductance L1, capacitor C11 and capacitor C12
Wave module, the direct current which mainly exports rectifier bridge 10 is filtered, to eliminate the interference signal in direct current.
In addition, the feedback winding of voltage changing module 20 is in the degaussing process of secondary windings according to output voltage VO UT output time
Output voltage VO UT is fed back to control chip 30 by feedback winding by grade coil voltage, and when secondary windings stops demagnetization
When, output voltage VO UT will stop feeding back to control chip 30；Wherein, which refers to feedback winding according to secondary
What the voltage ratio on grade winding obtained, proportionality coefficient is the turn ratio of feedback winding and secondary windings, and at secondary windings
When in degaussing process, the voltage on secondary windings is approximately equal to output voltage VO UT.
Remained capacity current generating unit 401 receives the error that control chip 30 exports and amplifies voltage VEA, and according to error
Amplify voltage VEA and generates remained capacity electric current IDC；Remained capacity electric current IDC conversion is negative by current-voltage converting unit 402
Carry identification voltage VDC；Multiple-stage filtering unit 403 receives clock signal clk, and knows under the action of clock signal clk to load
Other voltage VDC carries out multiple-stage filtering processing；Voltage-current conversion unit 404 receives enable signal ENR, and in enabled ENR signal
When invalid, the remained capacity voltage VDC after filtering processing is converted into the first electric current I1；Current mirror Unit 405 is according to the first electricity
It flows I1 and generates compensation electric current ICDC, and compensation electric current ICDC is exported to voltage changing module 20, make voltage changing module 20 according to compensation electricity
Output after ICDC generates offset voltage VCDC is flowed to be exported according to voltage changing module 20 to control chip 30 in order to controlling chip 30
The turn-on frequency of feedback voltage V FB and offset voltage VCDC control power switch tube Q1 and time, to control output voltage VO UT
It is constant.
Specifically, controlling chip 30 according to the voltage power supply in the feedback winding of transformer after diode D6, and connect
The sampled voltage VFB and voltage changing module 20 for receiving the feedback winding feedback of voltage changing module 20 are generated according to compensation electric current ICDC to be compensated
Voltage VCDC, and leading for offset voltage VCDC control power switch tube Q1 is generated according to sampled voltage VFB and compensation electric current ICDC
Logical frequency and time with shutdown, and then realize the constant current constant voltage control of power circuit.
Further, as shown in figure 3, control chip 30 includes: sampling and keep module 301, erasing time sampling module
302, error amplification module 303, constant current constant voltage control module 304, Logic control module 305 and output driving module 306.
Wherein, sampling and keep module 301 is connect with erasing time sampling module 302 and error amplification module 303, error
Amplification module 303 receives reference voltage Vref, and connect with constant current constant voltage control module 304, constant current constant voltage control module 304
It is connect with Logic control module 305, Logic control module 305 is connect with output driving module 306.
Specifically, sampling and keep module 301 is adopted according to the sampled voltage VFB and offset voltage VCDC of voltage changing module 20 generation
Sample keeps voltage VSH, and keeps voltage VSH to export to error amplification module 303 sampling；Error amplification module 303 is according to adopting
Sample keeps voltage VSH and reference voltage Vref to generate error amplification voltage VEA；Erasing time sampling module 302 is according to feedback electricity
VFB is pressed to generate erasing time TDS；Constant current constant voltage control module 304 is amplified voltage VEA and erasing time TDS according to error and is generated
Switch control signal；Logic control module 305 generates driving control signal PUL according to switch control signal；Output driving module
306 generate switching drive signal DRI according to driving control signal PUL, to control power switch tube according to switching drive signal DRI
The conducting and shutdown of Q1.
In embodiments of the present invention, since the offset voltage VCDC that voltage changing module 20 exports is to generate mould according to compensation electric current
What the compensation electric current ICDC that block 40 exports was obtained, and compensating electric current ICDC is the error amplification voltage VEA for controlling chip 30 and exporting
It obtains, which amplifies voltage VEA value relevant to load, and according to the relationship of voltage and electric current it is found that according to the mistake
Therefore the difference amplification available electric current relevant to load current Iout of voltage VEA amplifies voltage VEA according to the error and obtains
Compensation electric current ICDC it is same related to load current Iout, compensation electric current ICDC can be to load current Iout variation institute's band
The line loss voltage come compensates, therefore the power circuit that the embodiment of the present invention improves can be simultaneously according on load and output lead
Two variables of line loss voltage carry out pressure stabilizing adjusting to output voltage VO UT, improve the stabilization of the output end voltage of power circuit 1
Property.
It should be noted that in embodiments of the present invention, control chip 30 further includes reference offset module 307, starting mould
Block 308, feed-forward compensation module 310, trembles frequency module 311 and overcurrent protection module 312 at line complementary modulus block 309.Due to reference offset
Module 307, line complementary modulus block 309, feed-forward compensation module 310, trembles frequency module 311 and overcurrent protection module at starting module 308
312 structure and and control chip 30 in other modules between connection relationship it is identical with the prior art, it is specific
Working principle can refer to the prior art, therefore details are not described herein again.
Further, as a preferred embodiment of the invention, as shown in figure 4, remained capacity current generating unit 401 wraps
It includes: the first operational amplifier OP1, first switching element M1, first resistor R1 and the first current mirror CM1.
Wherein, the first input end of the first operational amplifier OP1 and control chip 30 (being not shown in the figure, please refer to Fig. 3)
The of connection, the second input terminal of the first operational amplifier OP1 and the input terminal of first switching element M1 and first resistor R1
One end connection, the output end of the first operational amplifier OP1 connect with the control terminal of first switching element M1, and the of first resistor R1
Two ends ground connection, the output end of first switching element M1 are connect with the input terminal of the first current mirror CM1, and the first current mirror CM1's is defeated
Outlet is connect with current-voltage converting unit 402.
It should be noted that in embodiments of the present invention, NMOS transistor realization can be used in first switching element M1, it should
Grid, drain electrode and the source electrode of NMOS transistor are respectively control terminal, input terminal and the output end of first switching element M1；When
So it will be appreciated by persons skilled in the art that first switching element M1 can also using NPN type triode, PNP type triode,
PMOS transistor etc. is realized, is not specifically limited herein.
In addition, the realization of p-type current mirror can be used in the first current mirror CM1, the realization of N-type current mirror can also be used, do not do herein
Concrete restriction.When the first current mirror CM1 is realized using p-type current mirror, the structure of the first current mirror CM1 is then at least two
The current mirror that PMOS transistor is constituted, is equally not particularly limited herein；When the first current mirror CM1 is realized using N-type current mirror
When, the structure of the first current mirror CM1 is then the current mirror that at least two NMOS transistors are constituted, and does not do specific limit equally herein
System.
Further, as a preferred embodiment of the invention, as shown in figure 4, current-voltage converting unit 402 includes:
Second resistance R2 and first capacitor C1.
Wherein, the first end of second resistance R2 and the first end of first capacitor C1 connect altogether, and produce with remained capacity electric current
Raw unit 401 and multiple-stage filtering unit 403 connect, and the second end of second resistance R2 is connected to altogether with the second end of first capacitor C1
Ground.
Further, as a preferred embodiment of the invention, as shown in Fig. 2, multiple-stage filtering unit 403 includes:
First filtering subunit 403a, connect with current-voltage converting unit 402, for remained capacity voltage VDC into
The filtering processing of the row first order.
Second filtering subunit 403b connect with the first filtering subunit 403a, and receives clock signal clk, is used for
Second level filtering processing is carried out to the remained capacity voltage VDC after the first order is filtered under the action of clock signal clk.
Third filtering subunit 403c is connect with the second filtering subunit 403b and Voltage-current conversion unit 402,
For carrying out third level filtering processing to the remained capacity voltage VDC after the second level is filtered.
Further, as an of the invention preferred embodiment, as shown in figure 4, the first filtering subunit 403a includes: the
Three resistance R3 and the second capacitor C2.
Wherein, the first end of 3rd resistor R3 is connect with current-voltage converting unit 402, the second end of 3rd resistor R3
It connects with the first end of the second capacitor C2, and is connect with the second filtering subunit 403b altogether, the second end ground connection of the second capacitor C2.
Further, as an of the invention preferred embodiment, as shown in figure 4, the second filtering subunit 403b includes: the
Two switch element M2, third switch element M3, the 4th switch element M4, the 5th switch element M5, third capacitor C3, the 4th capacitor
C4, the 5th capacitor C5, the 6th capacitor C6 and the first phase inverter U1.
Wherein, the input terminal of second switch element M2 is connect with the first filtering subunit 403a, second switch element M2's
Output end is connect with the input terminal of the first end of third capacitor C3 and third switch element M3, the output of third switch element M3
End connect with the first end of the input terminal of the 4th switch element M4 and the 4th capacitor C4, the output end of the 4th switch element M4 and
The first end connection of the input terminal and the 5th capacitor C5 of 5th switch element M5, the output end and the 6th of the 5th switch element M5
The first end and the 403c connection of third filtering subunit of capacitor C6, the control terminal and the 4th switch element of second switch element M2
The input terminal of the control terminal of M4 and the first phase inverter U1 receive clock signal clk, the output end and third of the first phase inverter U1
The control terminal of switch element M3 and the connection of the control terminal of the 5th switch element M5, the second end and the 4th capacitor of third capacitor C3
The second end of the second end of C4, the second end of the 5th capacitor C5 and the 6th capacitor C6 is connected to ground altogether.
It should be noted that in embodiments of the present invention, second switch element M2, third switch element M3, the 4th switch
Element M4 and the 5th switch element M5 is all made of transmission gate realization, and the control terminal of the transmission gate is second switch element M2, the
The control terminal of three switch element M3, the 4th switch element M4 and the 5th switch element M5, the input terminal of the transmission gate are second
The input terminal of switch element M2, third switch element M3, the 4th switch element M4 and the 5th switch element M5, the transmission gate
Output end is the output of second switch element M2, third switch element M3, the 4th switch element M4 and the 5th switch element M5
End.
Further, as an of the invention preferred embodiment, as shown in figure 4, third filtering subunit 403c includes: the
Four resistance R4 and the 7th capacitor C7.
Wherein, the first end of the 4th resistance R4 is connect with the second filtering subunit 403b, the second end of the 4th resistance R4 with
The first end and Voltage-current conversion unit 404 of 7th capacitor C7 connects, the second end ground connection of the 7th capacitor C7.
In embodiments of the present invention, by adding RC filter unit capacitor in the front stage of switch-capacitor filtering unit, can have
Effect avoids shaking the influence to power circuit 1, to further improve the stability of power circuit 1.
Further, as a preferred embodiment of the invention, as shown in figure 4, Voltage-current conversion unit 404 includes:
Second operational amplifier OP2, the 6th switch element M6, the 7th switch element M7, the 5th resistance R7 and the second current mirror CM2.
Wherein, the first input end of second operational amplifier OP2 is connect with multiple-stage filtering unit 403, the second operation amplifier
The second input terminal of device OP2 is connect with the input terminal of the first end of the 5th resistance R5 and the 7th switch element M7, the second operation
The output end of amplifier OP2 is connect with the input terminal of the control terminal of the 7th switch element M7 and the 6th switch element M6, and the 6th
The control terminal of switch element M6 receives enable signal ENR, the output end of the 6th switch element M6 and the second end of the 5th resistance R5
It is connected to ground altogether, the output end of the 7th switch element M7 is connect with the input terminal of the second current mirror CM2, and the second current mirror CM2's is defeated
Outlet is connect with current lens unit 405.
It should be noted that in embodiments of the present invention, the 6th switch element M6 and the 7th switch element M7 can be used
NMOS transistor realizes that grid, drain electrode and the source electrode of the NMOS transistor are respectively the switch of the 6th switch element M6 and the 7th
Control terminal, input terminal and the output end of element M7；Certainly it will be appreciated by persons skilled in the art that the 6th switch element M6
It can also be realized using NPN type triode, PNP type triode, PMOS transistor etc. with the 7th switch element M7, not make to have herein
Body limitation.
In addition, the realization of p-type current mirror can be used in the second current mirror CM2, the realization of N-type current mirror can also be used, do not do herein
Concrete restriction.When the second current mirror CM2 is realized using p-type current mirror, the structure of the second current mirror CM2 is then at least two
The current mirror that PMOS transistor is constituted, is equally not particularly limited herein；When the second current mirror CM2 is realized using N-type current mirror
When, the structure of the second current mirror CM2 is then the current mirror that at least two NMOS transistors are constituted, and does not do specific limit equally herein
System.
Further, as a preferred embodiment of the invention, as shown in figure 4, current lens unit 405 includes third electric current
The input terminal of mirror CM3, third current mirror CM3 are connect with Voltage-current conversion unit 404, and the output end of third current mirror CM3 is defeated
Electric current ICDC is compensated out.
It should be noted that in embodiments of the present invention, the realization of p-type current mirror can be used in third current mirror CM3, can also adopt
It is realized with N-type current mirror, is not particularly limited herein.When third current mirror CM3 is realized using p-type current mirror, third electric current
The structure of mirror CM3 is then the current mirror that at least two PMOS transistors are constituted, and is equally not particularly limited herein；When third electric current
When mirror CM3 is realized using N-type current mirror, the structure of third current mirror CM3 is then the electric current that at least two NMOS transistors are constituted
Mirror is equally not particularly limited herein.
1 working principle of power circuit provided by the present invention is made by taking Fig. 2, Fig. 3 and circuit shown in Fig. 4 as an example below
It illustrates, details are as follows:
Firstly, it is necessary to illustrate, the working principle of power circuit 1 provided by the present embodiment be can refer in earlier figures 2
Associated description, be no longer described in detail herein, that is to say, that herein only to power circuit 1 provided in an embodiment of the present invention
Isobarically Control be described in detail, it is specific as follows:
As illustrated in fig. 2, it is assumed that the output voltage of power circuit 1 is VOUT, while assuming not having on output lead pressure drop (i.e.
The resistance Rcable of output lead is that 0), pressure drop on diode D7 is Vd, in voltage changing module 20 the primary side auxiliary of transformer around
Group and the turn ratio of secondary windings are Nas, then the auxiliary winding voltage Vaux sampled are as follows:
Vaux=Nas × (Vout+Vd)； (1)
Wherein, Vaux is the voltage value of auxiliary winding voltage Vaux, and Nas is that the primary side of the transformer in voltage changing module 20 is auxiliary
The value of the turn ratio of winding and secondary windings is helped, Vout is the voltage value of output voltage VO UT, and Vd is the pressure drop on diode D7
The voltage value of Vd.
Further, the auxiliary winding voltage Vaux of the transformer in voltage changing module 20 is by divider resistance R6 and partial pressure electricity
After partial pressure after hindering R7, the feedback voltage V FB after partial pressure is exported to control chip 30, and feedback voltage V FB can be used
Following expression indicates:
Wherein, VFBFor the voltage value of feedback voltage V FB, R7 is the resistance value of divider resistance R7, and R6 is divider resistance R6's
Resistance value.
Formula (2) is changed, and then the output voltage VO UT of power circuit 1 can be obtained are as follows:
Due to when power circuit 1 specification determine after, the resistance value R7 of divider resistance R7, the resistance value of divider resistance R6
On the value Nas and diode D7 of the turn ratio of R6, the primary side auxiliary winding of transformer in voltage changing module 20 and secondary windings
Pressure drop Vd voltage value Vd be all it is determining, therefore, from formula (3) as can be seen that feedback voltage V FB be output voltage
The function of mono- variable of VOUT, when VOUT changes with load, control loop (control chip 30, power switch tube Q1 and change
The loop that die block 20 forms) it can be constant by feedback voltage V FB control output voltage VO UT.
However, in practical applications, since the resistance Rcable of power takeoff leads can not ignore, i.e. power takeoff leads
Resistance Rcable on pressure drop can not ignore, therefore, following formula can be then respectively adopted in above-mentioned formula (1), (2) and (3)
(4), (5) and (6) indicate:
Vaux=Nas × (Vout+Vd+Iout × Rcable)； (4)
Wherein, Rcable is the resistance value of the resistance Rcable of power takeoff leads, and Iout is the output electricity of power circuit 1
Flow the current value of Iout.
Since after output lead is selected, the resistance value Rcable of resistance Rcable is a determining value, and exports electricity
Stream Iout is a variable with load load variation, and therefore, above-mentioned formula (4), formula (5), (6) have output voltage
VOUT and output two variables of electric current Iout, but control loop only carries out pressure stabilizing adjusting to mono- variable of output voltage VO UT,
Without carrying out pressure stabilizing adjusting to output electric current Iout, therefore, control loop loses the output of the output end to power circuit 1
The constant control of voltage VOUT.
In view of the above-mentioned problems, power circuit 1 provided in an embodiment of the present invention by generate one with output electric current Iout at
The compensation electric current ICDC of ratio, and offset voltage VCDC is generated according to the compensation electric current ICDC, and then by offset voltage VCDC
It is overlapped with feedback voltage V FB, to offset the pressure drop on output lead by offset voltage VCDC, to restore control ring
The stability contorting function on road, keeps output voltage VO UT constant.The process will be specifically described below.
Firstly, in conjunction with foregoing description and Fig. 2 it is found that the output voltage VO UT of power circuit provided in an embodiment of the present invention 1
It can be expressed with following expression:
Wherein, ICDC is the current value for compensating electric current ICDC, and ICDC × R7 is the voltage value of offset voltage VCDC.
According to formula (6) and formula (7) it is found that eliminate output lead on pressure drop, then need so that
Formula (8) is converted and can be obtained, the expression formula of electric current ICDC is compensated are as follows:
Secondly, as illustrated in fig. 2, it is assumed that Nps is the armature winding of the transformer in voltage changing module 20 and the circle of secondary windings
Number ratio, Ip are the current peak in armature winding, and Isp is the current peak in secondary windings, and Ls is the inductance of secondary windings, Vs
For the output voltage of secondary windings, Dons is the duty ratio of secondary current, and Tons is the turn-on time of secondary diode D7, and f is
The working frequency of the power circuit 1, then according to transformer principle it is found that the relational expression of current peak Ip and current peak Isp are as follows:
Isp=Nps × Ip； (10)
Wherein, Isp is the value of current peak Isp, and Ip is the value of current peak Ip, and Nps is the transformation in voltage changing module 20
The value of the turn ratio Nps of the armature winding and secondary windings of device.
And due to the expression formula of electric current Isp are as follows:
Wherein, Vs is the voltage value of the output voltage Vs of secondary windings, and Ls is the inductance value of the inductance Ls of secondary windings,
Tons is the value of the turn-on time Tons of secondary diode D7.
It is then available according to formula (11), the expression formula of the turn-on time Tons of secondary diode D7 are as follows:
In terms of the output end of power circuit 1, in combination with duty ratioIt is found that output electric current
The expression formula of Iout is as follows:
Wherein, Dons is the value of the duty ratio Dons of secondary current, and T is the value of the duty cycle T of power circuit 1, and f is electricity
The value of the working frequency f of source circuit 1.
In conjunction with formula (9) and formula (13) it is found that power circuit provided in an embodiment of the present invention 1 compensates electric current ICDC's
Final expression formula are as follows:
From formula (14) as can be seen that power circuit 1 provided in an embodiment of the present invention compensation electric current ICDC be one with
The electric current of working frequency f and turn-on time the Tons variation of power circuit 1, can be effectively to the pressure drop of output lead by the electric current
It compensates, and the generation of the compensation electric current ICDC of power circuit provided in an embodiment of the present invention 1 is then to control core by identification
The variation of the size reaction Tons × f for the error amplification voltage VEA that piece 30 exports, and then obtain compensation electric current ICDC.
The generation of compensation electric current ICDC is specifically described below with reference to Fig. 4, details are as follows:
As shown in figure 4, the error amplification voltage VEA of control chip 30 (being not shown in the figure, please refer to Fig. 3) output is by the
The remained capacity electric current generation of one operational amplifier OP1, first switching element M1, first resistor R1 and the first current mirror CM1
After unit 401, a remained capacity electric current IDC relevant to load, the expression formula of remained capacity electric current IDC are generated are as follows:
Wherein, IDC is the current value of remained capacity electric current IDC, and Vea is the voltage value that error amplifies voltage VEA, R1 the
The resistance value of one resistance R1, M1 are the ratio of the first current mirror CM1.
It should be noted that since error amplification voltage VEA is the feedback that output voltage VO UT is mapped in control chip 30
The value that the feedback voltage V FB and reference voltage Vref of pin are relatively obtained, and output voltage VO UT can be obtained divided by load it is defeated
Voltage Iout out, therefore error amplification voltage VEA can produce an electric current with output electric current Iout variation to compensate output
Electric current Iout changes bring line loss, that is to say, that remained capacity current generating unit 401 can amplify voltage VEA according to error
A remained capacity electric current IDC is generated to reflect the variation of Tons × f.
After remained capacity current generating unit 401 generates remained capacity electric current IDC, which passes through
Second resistance R2 is converted to remained capacity voltage VDC, which opens by first order RC filter circuit, level Four
Filter circuit and second level RC filter circuit is closed to be exported later to Voltage-current conversion unit 404.
The working principle of level Four switched filter circuit is specifically described below:
As shown in figure 4, then second switch element M2 is connected, third switch element M3 when clock signal clk is high level
Cut-off, third capacitor C3 is connected with the filtered remained capacity identification voltage VDC of level-one at this time, therefore, in third capacitor C3
On charge expression formula then are as follows:
qC3=C3 × VDC； (16)
Wherein, qC3For the quantity of electric charge of the charge on third capacitor C3, C3 is the capacitance of third capacitor C3, and VDC is load
Identify the voltage value of voltage VDC.
When CLK_N is high level, then second switch element M2 ends, third switch element M3 conducting, at this time third electricity
Hold in the electric charge transfer to the 4th capacitor C4 on C3, i.e., the electric discharge of third capacitor C3 at this time, and by the charged lotus q of third capacitor C3C3
It is transferred on the 4th capacitor C4.
As seen from the above description, in each clock cycle (CLK+CLK_N), the electricity extracted from remained capacity voltage VDC
Lotus is supplied to the 4th capacitor C4, therefore the average current flowed through between second switch element M2 and third switch element M3 is
Iaw:
Wherein, the electric current for the average current Iaw that Iaw flows through between second switch element M2 and third switch element M3
Value, CLK are the turn-on time of clock signal clk, and CLK_N is clock signal clk _ N turn-on time.It can from formula (17)
Out, if CLK+CLK_N is sufficiently small, i.e. the time cycle is sufficiently small, then the charge on third capacitor C3 of remained capacity voltage VDC
The process for being transferred to the 4th capacitor C4 is continuously, therefore, can to determine between second switch element M2 and third switch element M3
One equivalent resistance Req of justice, and the expression formula of equivalent resistance Req are as follows:
Wherein, ReqFor the resistance value of equivalent resistance Req.
It is available in conjunction with formula (17) and (18):
And then, first equivalent time constant of level Four switched filter circuit available according to formula (19):
Wherein, C4 is the capacitance of the 4th capacitor C4, and τ 1 is the value of first time constant.
Similarly, the first equivalent time constant of level Four switched filter circuit are as follows:
Wherein, C6 is the capacitance of the 6th capacitor C6, and C5 is the value of the 5th capacitor C5, and τ 2 is the value of the second time constant.
Time constant due to influencing filter freguency response depends on the ratio of time cycle and capacitor, and in the modern times
In technique, the precision of capacitance ratio be can control within 0.1%, therefore, as long as selecting suitable clock frequency and reasonable
Capacitance ratio, so that it may obtain suitable time constant, and then may make level Four switch filtering capacitor to remained capacity voltage VDC
Effectively filtered.
It should be noted that in embodiments of the present invention, by increasing the first order before and after level Four switched filter circuit
RC filter circuit and second level RC filter circuit may make first order RC filter circuit and second level RC filter circuit to know load
Other voltage VDC is filtered, and ensures remained capacity voltage VDC being filtered into analog quantity, to reduce interference, so that the electricity
Source circuit 1 will not lead to the problem of that ripple is larger because of concussion, can be further ensured that the stabilization of output voltage VO UT.
Further, when the remained capacity voltage VDC after multiple-stage filtering is input to Voltage-current conversion unit 404
Afterwards, by second operational amplifier OP2, the 6th switch element M6, the 7th switch element M7, the 5th resistance R5 and the second current mirror
Remained capacity voltage VDC is converted to first when enable signal ENR is invalid by the Voltage-current conversion unit 404 that CM2 is constituted
Electric current I1, and the first electric current I1 compensates electric current ICDC by generating after third current mirror CM3, compensation electric current ICDC's
Expression formula are as follows:
Wherein, I1 is the current value of the first circuit I 1, and R5 is the resistance value of the 5th resistance R5, and M is the ratio of the second current mirror CM2
Value, N are the ratio of third current mirror CM3.
And since the first electric current I1 is to be obtained according to the remained capacity voltage VDC after multiple-stage filtering, and load and know
Other voltage VDC is obtained according to remained capacity electric current IDC, and therefore, the first electric current I1 and remained capacity electric current IDC goes up phase really
Deng, therefore the expression formula for compensating electric current ICDC can are as follows:
It is available in conjunction with formula (23) and formula (15), compensate the final expression formula of electric current ICDC are as follows:
It presses VEA related from formula (24) as can be seen that compensation electric current ICDC discharges to error, therefore, can be put according to error
The size of big voltage VEA and the value of R2, R1, M1, R5, M, N obtain a compensation electric current ICDC relevant to load variation,
So that voltage changing module 20 generates a compensation according to the partial pressure of the compensation electric current ICDC and divider resistance R6 and divider resistance R7
Output is to control chip 30 after voltage VCDC, offset voltage VCDC are superimposed with feedback voltage V FB, so that control chip 30 can root
It controls, and leads to turn-on time according to turn-on frequency of the offset voltage VCDC and feedback voltage V FB to power switch tube Q1
The size for crossing adjustment divider resistance R6 and divider resistance R7, can satisfy the compensation requirement of the not collinear resistance of different electrical power circuit 1.
In the present embodiment, power circuit 1 provided by the invention amplifies voltage VEA one compensation electric current ICDC of generation according to error, into
And according to the compensation electric current ICDC generate one can to the offset voltage VCDC that the pressure drop on the output lead of power supply compensates,
Allow control chip 30 according to offset voltage VCDC and turn-on time and conducting of the feedback voltage V FB to power switch tube Q1
Frequency is controlled, so that output end output voltage VO UT stablizes；In addition, using multiple-stage filtering unit to remained capacity electricity
Pressure carries out multiple-stage filtering processing, can effectively improve the precision of the first electric current obtained according to remained capacity voltage, and then improve
The precision of offset voltage is asked there are output end voltage is unstable after line pressure compensation to solve existing power circuit and introduce
Topic, and improve the precision of output voltage.
Further, the present invention also provides a kind of power supply, which includes power circuit.It should be noted that due to
The power circuit of power supply provided by the embodiment of the present invention and Fig. 2 are identical to power circuit shown in Fig. 4, and therefore, the present invention is real
The concrete operating principle for applying the power circuit in power supply provided by example can refer to the detailed description previously with regard to Fig. 3 to Fig. 4,
Details are not described herein again.
In the present invention, by using including remained capacity current generating unit, current-voltage converting unit, multistage filter
The compensation current generating module of wave unit, Voltage-current conversion unit and current lens unit, so that remained capacity electric current generates
Unit generates remained capacity electric current according to the error amplification voltage of control chip output, and current-voltage converting unit is by the load
Identification electric current is converted to remained capacity voltage, and multiple-stage filtering unit carries out multiple-stage filtering processing, electric piezo-electric to remained capacity voltage
Remained capacity voltage after filtering processing is converted to the first electric current by stream-converting unit, and current lens unit is produced according to first electric current
Raw compensation electric current, and compensation electric current is exported to voltage changing module, so that voltage changing module generates offset voltage according to compensation electric current, into
And make the turn-on frequency and the time that control feedback voltage and offset voltage control power tube that chip is exported according to voltage changing module.
Since the error amplification voltage of control chip output is obtained according to the output end voltage of power circuit, according to the error
The obtained compensation electric current of amplification voltage can reflect the variation of load current, so can pressure drop to power takeoff leads into
Row compensation so that power circuit output end voltage stablize, while using multiple-stage filtering unit to remained capacity voltage into
The processing of row multiple-stage filtering, can effectively improve the precision of the first electric current obtained according to remained capacity voltage, and then improve compensation
The precision of voltage, so that it is unstable to solve the problems, such as after existing power circuit introduces line pressure compensation that there are output end voltages, and
Improve the precision of output voltage.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of power circuit, connected with load, the power circuit include rectifier bridge, voltage changing module, power switch tube and
Chip is controlled, the rectifier bridge is connect with the voltage changing module, the voltage changing module and the power switch tube, the control core
Piece and load connection, the control chip are connect with the power switch tube, which is characterized in that the power circuit is also
Including compensating current generating module, the compensation current generating module includes:
Remained capacity current generating unit is connect with the control chip, and the error for receiving the control chip output is put
Big voltage, and voltage is amplified according to the error and generates remained capacity electric current；
Current-voltage converting unit is connect with the remained capacity current generating unit, for turning the remained capacity electric current
It is changed to remained capacity voltage；
Multiple-stage filtering unit connect with the current-voltage converting unit, and receives clock signal, for believing in the clock
Multiple-stage filtering processing is carried out to the remained capacity voltage under the action of number；
Voltage-current conversion unit connect with the multiple-stage filtering unit, and receives enable signal, in the enabled letter
When number invalid, the remained capacity voltage after filtering processing is converted into the first electric current；
Current lens unit connect with the Voltage-current conversion unit, the control chip and the voltage changing module, is used for
Compensation electric current is generated according to first electric current, and the compensation electric current is exported to the voltage changing module, makes the transformation mould
Output is to the control chip after root tuber generates offset voltage according to the compensation electric current, in order to which the control chip is according to
The feedback voltage and offset voltage of voltage changing module output control turn-on frequency and the time of the power switch tube.
2. power circuit according to claim 1, which is characterized in that the remained capacity current generating unit includes:
One operational amplifier, first switching element, first resistor and the first current mirror；
The first input end of first operational amplifier is connect with the control chip, and the second of first operational amplifier
Input terminal is connect with the first end of the input terminal of the first switching element and the first resistor, first operation amplifier
The output end of device is connect with the control terminal of the first switching element, and the second end ground connection of the first resistor, described first opens
The output end for closing element is connect with the input terminal of first current mirror, the output end and the electric current-of first current mirror
Voltage conversion unit connection.
3. power circuit according to claim 1, which is characterized in that the current-voltage converting unit includes: the second electricity
Resistance and first capacitor；
The first end of the second resistance and the first end of the first capacitor connect altogether, and generate with the remained capacity electric current
Unit and multiple-stage filtering unit connection, the second end of the second resistance and the second end of the first capacitor are connected to altogether
Ground.
4. power circuit according to any one of claims 1 to 3, which is characterized in that the multiple-stage filtering unit includes:
First filtering subunit is connect with the current-voltage converting unit, for carrying out first to the remained capacity voltage
Grade filtering processing；
Second filtering subunit connect with first filtering subunit, and receives the clock signal, in the clock
Second level filtering processing is carried out to the remained capacity voltage after the first order is filtered under the action of signal；
Third filtering subunit is connect with second filtering subunit and the Voltage-current conversion unit, for warp
Remained capacity voltage after crossing second level filtering processing carries out third level filtering processing.
5. power circuit according to claim 4, which is characterized in that first filtering subunit includes: 3rd resistor
With the second capacitor；
The first end of the 3rd resistor is connect with the current-voltage converting unit, the second end of the 3rd resistor and institute
The first end for stating the second capacitor connects altogether, and connect with second filtering subunit, the second end ground connection of second capacitor.
6. power circuit according to claim 4, which is characterized in that second filtering subunit includes: second switch
Element, third switch element, the 4th switch element, the 5th switch element, third capacitor, the 4th capacitor, the 5th capacitor, the 6th electricity
Appearance and the first phase inverter；
The input terminal of the second switch element is connect with first filtering subunit, the output end of the second switch element
It is connect with the input terminal of the first end of the third capacitor and the third switch element, the output of the third switch element
End connect with the first end of the input terminal of the 4th switch element and the 4th capacitor, the 4th switch element it is defeated
Outlet is connect with the first end of the input terminal of the 5th switch element and the 5th capacitor, the 5th switch element
Output end is connect with the first end of the 6th capacitor and the third filtering subunit, the control of the second switch element
End and the input terminal of the control terminal of the 4th switch element and first phase inverter receive the clock signal, and described the
The output end of one phase inverter is connect with the control terminal of the control terminal of the third switch element and the 5th switch element, institute
State the second end of third capacitor and the second end of the 4th capacitor, the second end of the 5th capacitor and the 6th capacitor
Second end be connected to ground altogether.
7. power circuit according to claim 4, which is characterized in that the third filtering subunit includes: the 4th resistance
With the 7th capacitor；
The first end of 4th resistance is connect with second filtering subunit, the second end of the 4th resistance and described the
The first end of seven capacitors and Voltage-current conversion unit connection, the second end ground connection of the 7th capacitor.
8. power circuit according to claim 1, which is characterized in that the Voltage-current conversion unit includes: the second fortune
Calculate amplifier, the 6th switch element, the 7th switch element, the 5th resistance and the second current mirror；
The first input end of the second operational amplifier is connect with the multiple-stage filtering unit, the second operational amplifier
Second input terminal is connect with the input terminal of the first end of the 5th resistance and the 7th switch element, second operation
The output end of amplifier is connect with the input terminal of the control terminal of the 7th switch element and the 6th switch element, described
The control terminal of 6th switch element receives the enable signal, output end and the 5th resistance of the 6th switch element
Second end is connected to ground altogether, and the output end of the 7th switch element is connect with the input terminal of second current mirror, and described second
The output end of current mirror is connect with the current lens unit.
9. power circuit according to claim 1, which is characterized in that the current lens unit includes third current mirror, institute
The input terminal for stating third current mirror is connect with the Voltage-current conversion unit, and the output end of the third current mirror exports institute
State compensation electric current.
10. a kind of power supply, which is characterized in that the power supply includes power circuit as described in any one of claim 1 to 9.
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| CN113515979A (en) * | 2020-04-09 | 2021-10-19 | 义隆电子股份有限公司 | Induction type electronic identification device and power supply compensation circuit thereof |
| CN117118236A (en) * | 2023-10-19 | 2023-11-24 | 上海芯龙半导体技术股份有限公司 | Power chip and power supply structure |
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Effective date of registration: 20210219 Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Applicant after: BYD Semiconductor Co.,Ltd. Address before: 518118 BYD Road, Pingshan New District, Shenzhen, Guangdong 3009 Applicant before: BYD Co.,Ltd. |