CN106257814B - A kind of PFM application circuit based on 3842 family chips - Google Patents
A kind of PFM application circuit based on 3842 family chips Download PDFInfo
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- CN106257814B CN106257814B CN201610679428.2A CN201610679428A CN106257814B CN 106257814 B CN106257814 B CN 106257814B CN 201610679428 A CN201610679428 A CN 201610679428A CN 106257814 B CN106257814 B CN 106257814B
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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
- 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
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
Abstract
Type patent of the present invention discloses a kind of based on by taking 3842 series of controller chip of 8 feet as an example, and the circuit of PFM mode is changed into the application in switch power technology field by PWM mode.Including 3842 ic chips 1, resistance R4, R14, capacitor C7, optocoupler U1.Existing 3842 internal circuits are defined as the block diagram with 8 different function feet.One end of the connection of 4 feet R4, R14, C7 of 3842 ic chip 1, the other end of C7 connect ground, the E foot of the other end connection U1 of R14, and the other end of R4 connects 8 feet of IC1, and 8 feet of IC1 are also connected with the C foot of U1, and 5 feet of IC1 connect ground.When the C foot E foot of optocoupler is begun to turn on, the charging current of C7 increases, and 3842 working condition of controller chip is that PFM mode substantially increases the stability and efficiency of circuit, reduce the workload of design, detection, production after mode changes.
Description
Technical field
The present invention relates to a kind of PFM circuit, specifically a kind of PFM application circuit based on 3842 family chips.
Background technique
3842 series of switch power controller chip, is that switch power technology field application time is earliest, most widely used
A kind of controller chip, be a kind of high-performance, typical PWM mode controller chip.This chip mainly has following characteristics:
(1) discharge current for finely tuning oscillator accurately controls duty ratio, and the measurement of (2) single pulse is latched, by all current limlitings, and (3) are internal
Reference voltage, under-voltage locking, (4) high current totem exports (5) low starting and operating current.The controller of this series
Chip periphery circuit is simple, cheap.It is very widely used in power technique fields at present.The controller core of this series
Piece, nowadays conventional application circuit has two kinds, sees attached drawing 1 and attached drawing 2.Attached drawing 1 and attached drawing 2 are the typical PWM moulds of output+12V
Formula switching power circuit.Its working principle is known, does not describe.
All producers for manufacturing 3842 series of controller chip now provide the specification of 3842 series of controller chip
Book is all operate on PWM mode.Switching Power Supply product is designed by attached drawing 1 and 2 PWM mode of attached drawing, there is some shortcomings.
Give some instances: (1) controller chip 3842 is current-mode controller, is had many good qualities naturally, (not introducing) but every kind of power supply
The closed-loop control of product will pay certain time intense adjustment, slightly improper job insecurity occur, when serious certainly
Swash.(2) external load is from zero to fully loaded, the input voltage of power supply from when most changing as low as highest, always there is individual point less stables,
Especially fictitious load is smaller, when external load is zero.(3) slope compensation is wanted when controller chip 3842 works, if compensation is not
In place, closed loop adjustment is slightly improper occurs as soon as job insecurity.(4) fictitious load cannot be too small, and generally 1%~2%, fictitious load
Little Yi appearance is unstable, and the method that the big every secondary design of low efficiency of fictitious load can only take compromise solves the problems, such as this.
Summary of the invention
The purpose of the present invention is to provide a kind of PFM application circuits based on 3842 family chips, to solve above-mentioned background
The problem of being proposed in technology.
To achieve the above object, the invention provides the following technical scheme:
A kind of PFM application circuit based on 3842 family chips, including 3842 ic chips 1, resistance R4, resistance R14, electricity
Hold C7 and optocoupler U1,4 feet connection resistance R4, the E foot of optocoupler U1 and one end of capacitor C7 of 3842 ic chip 1, capacitor
The other end of C7 connects ground, and 5 feet of 3842 ic chips 1 connect ground, and the other end of resistance R4 connects the 8 of 3842 ic chips 1
Foot, the C foot of optocoupler U1 connect 7 feet or 8 feet of 3842 ic chips 1.
As further scheme of the invention: further including resistance R14, resistance R14 is connected to 4 feet of 3842 ic chips 1
Between the E foot of optocoupler U1, or it is connected between 7 feet or 8 feet and the C foot of optocoupler U1 of 3842 ic chips 1.
As further scheme of the invention: the resistance value of the resistance R4 determines that principle is, the C of triode inside optocoupler U1
The pole pole E, in the state of open circuit, the resistance value of resistance R4 makes 3842 ic chips 1 be in the transition PFM mould by PWM mode
Transition point when formula.
As further scheme of the invention: described when the C foot E foot of optocoupler U1 is begun to turn on, the charging electricity of capacitor C7
When stream increases, 3842 series of tasks state of controller chip is PFM mode.
As further scheme of the invention: 2 feet of 3842 ic chip 1 of control of 8 feet encapsulation being merged with 5 feet, 1 foot
Vacantly, then 3842 ic chips 1 become 6 pin packaging structures.
As further scheme of the invention: 3842 ic chip 1 is 3842 series, 1842 series or 2842 series
One of chip.
As further scheme of the invention: the model PC817 of the optocoupler U1.
Compared with prior art, the beneficial effects of the present invention are: (1) as long as frequency is transferred to required frequency after, ring
Roadbed sheet does not have to the work that adjustment can be highly stable.(2) it loads outside from zero to fully loaded, power input as low as highest from most changing
When, if non-overloading, work it is highly stable.(3) even if the not slope compensation of controller chip 3842, the work that loop still can be stable
Make, it is more stable to increase slope compensation work.(4) fictitious load can very little improve efficiency.
Detailed description of the invention
Fig. 1 is the first common circuit figure of the prior art；
Fig. 2 is second of common circuit figure of the prior art；
Fig. 3 is the circuit diagram of the embodiment of the present invention 1；
Fig. 4 is the circuit diagram of the embodiment of the present invention 2；
Fig. 5 is the circuit diagram of the embodiment of the present invention 3；
Fig. 6 is the circuit diagram of the embodiment of the present invention 4；
Fig. 7 is the circuit diagram of the embodiment of the present invention 5；
Fig. 8 is the circuit diagram of the embodiment of the present invention 6；
Fig. 9 is the complete circuit of PFM of the present invention；
Figure 10 is 3842 serial block architecture diagrams of existing 8 foot.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1-10, a kind of application based on 3842 series of controller chip in switch power technology field, by PWM
Operating mode changes into the circuit of PFM operating mode.See 3 circuit diagram of attached drawing, including 3842 ic chips 1, resistance R4, resistance
R14, capacitor C7, optocoupler U1.Wherein 3842 Series Internal circuit definitions are the block diagram with 8 different function feet, block diagram
Inside structure is shown in attached drawing 10.The RT/CT foot of 3842 ic chip 1 i.e. 4 feet connect one end of R4, resistance R14, capacitor C7, electricity
The other end for holding C7 is grounded, the E foot of another termination U1 of resistance R14,5V benchmark foot i.e. 8 feet of another termination IC1 of resistance R4,
5V benchmark foot i.e. 8 feet of IC1 also connect the C foot of U1, the 5 feet ground connection of IC1.The connection and the prior art of 1,2,3,5,6,7 feet of IC1
It is identical, see attached drawing 9.The reasonable combination of element R4, resistance R14, U1, capacitor C7 and 3842 internal circuit of controller chip, composition
One circuit that the series of controller chip 3842 can be made to change by PWM operating mode PFM operating mode, it is exactly of the invention
Main points, therefore the present invention is the block diagram with 8 different function feet existing 3842 Series Internal circuit definitions, with element
R4, resistance R14, U1, the PFM circuit of capacitor C7 composition are indivisible.Attached drawing 3 is a part of attached drawing 9.3 circuit diagram of attached drawing
Keep controller chip 3842 serial with the circuit, the function of PFM operating mode is changed by PWM operating mode, is that the present invention wants
The emphasis of protection.
There are also other several different schemes by the present invention on the basis of attached drawing 3.Scheme 1: a termination control of the resistance R14
The E foot of 8 feet of device chip 3842 processed, the C foot of another termination optocoupler U1 of resistance R14, optocoupler U1 connects controller chip 3842
4 feet, the connection of other elements is constant.See attached drawing 4；Scheme 2: the circuit removes R14, and the E foot of optocoupler is directly connected to control
4 feet of chip 3842, the connection of other elements are constant, see attached drawing 5；Scheme 3: the C foot of the optocoupler is directly connected to control chip
3842 7 feet, the connection of other elements are constant, see attached drawing 6；Scheme 4: the 7 of a termination controller chip 3842 of the resistance R14
Foot, the C foot of another termination optocoupler U1 of resistance R14,4 feet of the E foot connection controller chip 3842 of U1, other element connections are not
Become, sees attached drawing 7；Scheme 5: the circuit removes R14, and the C foot of optocoupler is directly connected to the E of 7 feet of control chip 3842, optocoupler
Foot be directly connected to control chip 3842 4 feet, other elements connection it is constant, see attached drawing 8.
The attached drawing 3, attached drawing 4, attached drawing 5, attached drawing 6, attached drawing 7, attached drawing 3 is used as the preferred solution of the invention circuit in attached drawing 8.
Attached drawing 9 is the complete PFM mode circuit figure of output+12V, its working principle is that, the alternating current of 220V is through D1~D4
Rectification, after capacitor C1 filtering, the anode of capacitor C1 obtains the direct current an of+300V, this+300V direct current is by R1 to control
7 feet of device chip 3842 processed are powered, and when 7 foot voltages of controller chip 3842 are raised to 16V, controller chip 3842 starts work
Make, the 6 feet output of controller chip 3842 has the rectangular wave of certain frequency, drives MOS1, MOS1 is made to be in switch state, B1
N1 winding generate an alternating voltage field, N2 and N3, which are respectively induced out one, has a rated transformation ratio voltage field, the electricity that N3 is generated
It has a meeting, an audience, etc. well under one's control and powers after D7 rectification C3 filtering to R3, the voltage field that N2 is generated supplies after D6 rectification C2 filtering to controller chip 3842
Electricity maintains the normal work of controller chip 3842.
The loop stability adjustment process of attached drawing 9, which is that the voltage of+12V is divided through resistance R10, resistance R11, to be sampled, and benchmark is made
A voltage is got in the pole G of element T1, and when+12V voltage increases, the G pole tension of reference element T1 starts to increase, reference element
The pole the K pole A of T1 is begun to turn on, and the electric current of optocoupler interior light emitting diodes increases after resistance R9, triode inside optocoupler
C, the pole E is begun to turn on, and the charging current of capacitor C7 increases,.3842 frequency of oscillation of controller chip starts to reduce, and duty ratio subtracts
Small ,+12V output starts to reduce, and realizes closed loop regulation.Power circuit works in PFM mode.
Circuit theory of the invention is: refering to attached drawing 9, a kind of PFM mode switch electricity typical intact based on output+12V
Source circuit, including 3842 ic chips 1, resistance R1~R11, resistance R14, capacitor C1~C8, diode D1~D7, switching tube
Mos1, reference element T1, thermistor RM1, optocoupler U1, protective tube FUSE1.1 foot of controller chip IC1 in the attached drawing 9
Vacantly.The primary ground of 2 feet connection.3 feet connect one end of C6 and R6, and the other end of C6 connects primaryly, the other end connection R7 of R6,
The pole S of R8 and mos1, the primary ground of other end connection of resistance R7.4 feet connect one end of R4, R14, C7, the other end of capacitor C7
Connect primary ground, 8 feet of the other end connection IC1 of R4, the E foot of the other end connection U1 of R14.The primary ground of 5 feet connection.The connection of 6 feet
One end of R5, the pole G of the other end connection R8 and mos1 of R5.7 feet connect the anode of one end of R1 and the cathode C2 of D6, and C2's is negative
The primary ground of pole connection, 3 feet of the anode connection B1 of D6.8 feet connect one end of R4, C5 and the C foot of U1, and the other end of capacitor C5 connects
Connect primary ground.1 foot connection R1, resistance R2, one end of capacitor C4 and the+300V of transformer B1.The other end connection of R2, capacitor C4
The cathode of D5.The anode of the 2 feet connection D5 of B1 and the pole D of MOS1.The primary ground of 4 feet connection of B1.The 5 feet connection D7 of B1 is just
Pole, the anode of the cathode connection C3 of D7 ,+12V output, one end of connection R3, resistance R9, R10, the cathode of capacitor C3 and R3's is another
One end connects secondary ground, the A foot of the other end connection U1 of resistance R9, and the other end of resistance R10 connects one end of C8, resistance R11
With the G foot of T1, the other end of resistance R11 connects secondary ground, and the capacitor C8 other end connects the K foot of U1 and the K foot of T1, the A foot of T1
Connect secondary ground.6 feet of B1 connect secondary ground.Not described element forms known current rectifying and wave filtering circuit, is no longer described in detail.
Attached drawing 3 is a part of attached drawing 9, on the basis of attached drawing 3, realizes that 3842 series are changed by PWM operating mode
There are also following several schemes for PFM operating mode；Scheme 1: 8 feet of a termination controller chip 3842 of the resistance R14, resistance
The C foot of another termination optocoupler U1 of R14,4 feet of the E foot connection controller chip 3842 of optocoupler U1, other element connections are constant.
See attached drawing 4；Scheme 2: the circuit removes R14, and the E foot of optocoupler is directly connected to 4 feet of control chip 3842, other elements connect
It connects constant, sees attached drawing 5；Scheme 3: the C foot of the optocoupler is directly connected to 7 feet of control chip 3842, the connection of other elements not
Become, sees attached drawing 6；Scheme 4: 7 feet of a termination controller chip 3842 of the resistance R14, another termination optocoupler of resistance R14
The C foot of U1,4 feet of the E foot connection controller chip 3842 of U1, other element connections are constant, see attached drawing 7；Scheme 5: the electricity
R14 is removed on road, and the C foot of optocoupler is directly connected to 7 feet of control chip 3842, the E foot of optocoupler is directly connected to control chip
3842 4 feet, the connection of other elements are constant, see attached drawing 8.
Element determines that method is in the preferred solution of the invention attached drawing 3, according to the working frequency to be designed, first determines capacitor C7
Value, after the value of C7 determines, the resistance value of resistance R4 determines that principle is, the pole the C pole E of triode inside optocoupler U1, in open circuit
Under state, the resistance value of resistance R4 is adjusted to mistake when controller chip 3842 being made to be in the transition PFM mode by PWM mode
It crosses a little.Working condition of the present invention is after scheme is implemented, and when the conducting of the C foot E foot of U1, the charging current of capacitor C7 increases, and controls
3842 frequency of oscillation of device chip starts to reduce, and duty ratio reduces, and circuit works in PFM mode.
The present invention is suitable for 3842 series of existing 14 feet encapsulation, because connecting the identical function of 3842 series of different encapsulation
Foot can obtain same effect；It is also applied for changing into 3842 series newly encapsulated, example: in attached drawing 9, controller chip
After 3842 change into PFM mode by PWM mode, 3842,2 foot of control chip and 5 feet of 8 feet encapsulation are combinable, and 1 foot is hanging,
Therefore the control chip 3842 of 8 feet encapsulation can be changed to the encapsulation of 6 feet；It is also applied for only modifying the model of 3842 family chips, it is internal
Circuit is motionless and does not do other new model integrated packages of substantive change, and existing 3842 chip interior block architecture diagrams are shown in attached drawing 10；?
Suitable for 1842 series, 1842 series include 1843,1844,1845 and 2842 series, 2842 series include 2843,2844,
2845, because this two series are identical with 3842 Series Internal circuits and function.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention that any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (6)
1. a kind of PFM application circuit based on 3842 family chips, including 3842 ic chips 1, resistance R4, resistance R14, capacitor
C7 and optocoupler U1, it is characterised in that: 4 feet of 3842 ic chip 1 connect resistance R4, the E foot of optocoupler U1 and capacitor C7
One end, the other end of capacitor C7 connect ground, and 5 feet of 3842 ic chips 1 connect ground, and the other end connection 3842 of resistance R4 is integrated
8 feet of block IC1, the C foot of optocoupler U1 connect 7 feet or 8 feet of 3842 ic chips 1；It further include resistance R14, resistance R14 is connected to
Between 4 feet of 3842 ic chips 1 and the E foot of optocoupler U1, or it is connected to 7 feet or 8 feet and optocoupler U1 of 3842 ic chips 1
Between C foot.
2. a kind of PFM application circuit based on 3842 family chips according to claim 1, which is characterized in that the electricity
The resistance value of resistance R4 determines that principle is, the pole the C pole E of triode inside optocoupler U1, in the state of open circuit, the resistance value of resistance R4 makes
3842 ic chips 1 are in transition point when transition is PFM mode by PWM mode.
3. a kind of PFM application circuit based on 3842 family chips according to claim 1 or 2, which is characterized in that described
When the C foot E foot of optocoupler U1 is begun to turn on, when the charging current of capacitor C7 increases, 3842 series of tasks state of controller chip
For PFM mode.
4. a kind of PFM application circuit based on 3842 family chips according to claim 1 or 2, which is characterized in that by 8
2 feet of 3842 ic chip 1 of control of foot encapsulation merge with 5 feet, and 1 foot is hanging, then 3842 ic chips 1 become 6 feet encapsulation knot
Structure.
5. a kind of PFM application circuit based on 3842 family chips according to claim 1 or 2, which is characterized in that described
3842 ic chips 1 are one of 3842 series, 1842 series or 2842 family chips.
6. a kind of PFM application circuit based on 3842 family chips according to claim 1 or 2, which is characterized in that described
The model PC817 of optocoupler U1.
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| CN201610679428.2A CN106257814B (en) | 2016-08-11 | 2016-08-11 | A kind of PFM application circuit based on 3842 family chips |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610679428.2A CN106257814B (en) | 2016-08-11 | 2016-08-11 | A kind of PFM application circuit based on 3842 family chips |
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| CN106257814B true CN106257814B (en) | 2019-03-26 |
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| CN101989406A (en) * | 2009-07-29 | 2011-03-23 | 晨星软件研发(深圳)有限公司 | Display control circuit with extremely low power consumption and related method thereof |
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| TW200639873A (en) * | 2005-05-06 | 2006-11-16 | Silicon Power Comp & Comm Inc | System for converting input voltage in memory card |
| US8611106B2 (en) * | 2011-01-12 | 2013-12-17 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for adjusting current consumption of control chips to reduce standby power consumption of power converters |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201199637Y (en) * | 2008-05-07 | 2009-02-25 | 陈赖容 | Management circuit for battery set |
| CN101989406A (en) * | 2009-07-29 | 2011-03-23 | 晨星软件研发(深圳)有限公司 | Display control circuit with extremely low power consumption and related method thereof |
Non-Patent Citations (2)
| Title |
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| LLC谐振变换器的研究;谢华林;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20110415(第2011年第4期);第8页至第9页 |
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Effective date of registration: 20190514 Address after: 056000 South of Yanghe Village, Longyao Town, Longyao County, Xingtai City, Hebei Province Patentee after: Xingtai pine Crystal Electronic Technology Co., Ltd. Address before: 056000 No. 2, 24th Building, Sanjie, Yangnan Street, Xinpo Town, Fengfeng Mining Area, Handan City, Hebei Province Patentee before: Jia Zhijun |
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