CN205265513U - A compensating circuit for switching power supply management chip - Google Patents
A compensating circuit for switching power supply management chip Download PDFInfo
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- CN205265513U CN205265513U CN201521082678.5U CN201521082678U CN205265513U CN 205265513 U CN205265513 U CN 205265513U CN 201521082678 U CN201521082678 U CN 201521082678U CN 205265513 U CN205265513 U CN 205265513U
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- power supply
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Abstract
The utility model relates to a compensating circuit for switching power supply management chip, including connecting the compensation module between switching power supply's COMP pin and VCC pin, the compensation module includes the triode, and the COMP pin is connected to the base of triode, the VCC pin is connected to the collecting electrode of triode, the emitter electrode of the triode is grounded. The utility model discloses a compensating circuit for switching power supply management chip, make full use of power management chip's the COMP foot voltage and the relation of load, heavier as output load, COMP voltage is high more. Consequently, work as the load and increase the weight of, during the COMP boosting, slightly draw the voltage that hangs down VCC, realization compensation through the triode in the compensation module. Can prevent effectively that VCC voltage from changing along with the load by a wide margin, also avoid simultaneously probably pushing up VCC's OVP point when heavily loaded and the trouble that leads to.
Description
Technical field
The utility model relates to switch power technology field, particularly relates to a kind of for Switching Power Supply management coreThe compensating circuit of sheet.
Background technology
Switching Power Supply is because the advantage that its efficiency is high, volume is little, lightweight, precision is high is popularized fastApplication widely. Power semiconductor electronic device high speed development, power supply theoretical research deepens continuously, variousTopology increasingly mature in the application of various product, the shipment amount of various product is also increasing, and at this time byWhat cause in devices in batches production inconsistency is bad more and more general.
In implementation procedure, inventor finds that in conventional art, at least there are the following problems:
Transformer in Switching Power Supply is extremely crucial device. The mode of production of transformer is still with half nowAutomatically it is main producing, and practitioner's ability and the technique of production are the problems that affects transformer uniformity maximum.For example the leakage inductance parameter between winding is exactly one of them example. In the time producing in enormous quantities, leakage inductance parameter differences veryGreatly. And the leakage inductance parameter of transformer can affect the intermodulation performance of each winding voltage of power supply. When there being winding loadVery heavy, while having winding load lighter, there will be and be with underloaded winding voltage to float high phenomenon, and floating high journeyBetween degree and winding, leakage inductance size has very large relation. As Fig. 1 below (is supplied to power management chip by auxiliary windingThe structure principle chart of the Switching Power Supply of electricity), when output winding band different loads, VCC (VoltCurrentCondenser: the Power supply pin of power management chip) voltage there will be unsteady, when load is heavier,The voltage of VCC raises, in the time that load is lower, and VCC voltage drop. The fluctuation of this voltage is can impactThe performance of power supply, even the protection point of possibility flip chip VCC, directly causes product to break down.
Utility model content
Based on this, be necessary for the power management chip VCC voltage of Switching Power Supply with load fluctuationProblem, provides a kind of compensating circuit for Switching Power Supply managing chip.
To achieve these goals, the embodiment of technical solutions of the utility model is:
A kind of compensating circuit for Switching Power Supply managing chip is provided, comprised and be connected to Switching Power SupplyCompensating module between COMP pin and VCC pin;
Compensating module comprises triode, and the base stage of triode connects COMP pin; The colelctor electrode of triode connectsConnect VCC pin; The grounded emitter of triode.
Technique scheme has following beneficial effect:
The utility model is for the compensating circuit of Switching Power Supply managing chip, makes full use of power management chipThe relation of COMP pin (Compensation: current compensation control pin) voltage and load, works as output loadingHeavier, COMP voltage is higher. Therefore,, when load increases the weight of, when COMP voltage raises, pass through compensation filmTriode in piece slightly drags down the voltage of VCC, realizes compensation. Can effectively prevent that VCC voltage is with negativeCarry significantly variation, while also having avoided heavily loaded, may push up the OVP (OverVoltage of VCC simultaneouslyProtection: overvoltage protection) point and the fault that causes.
Brief description of the drawings
By the more specifically explanation of the preferred embodiment of the present utility model shown in accompanying drawing, of the present utility modelAbove-mentioned and other object, that Characteristics and advantages will become will be more clear. Identical Reference numeral in whole accompanying drawingsIndicate identical part, and deliberately do not draw accompanying drawing by actual size equal proportion convergent-divergent, focus on illustratingPurport of the present utility model.
Fig. 1 is the structural representation to the Switching Power Supply of power management chip power supply by auxiliary winding in conventional artFigure;
Fig. 2 is the structural representation of the utility model for the compensating circuit embodiment 1 of Switching Power Supply managing chipFigure;
Fig. 3 is the concrete structure of the utility model for the compensating circuit embodiment 1 of Switching Power Supply managing chipSchematic diagram;
Fig. 4 is the structural representation of the utility model for the compensating circuit embodiment 2 of Switching Power Supply managing chipFigure;
Fig. 5 is the concrete structure of the utility model for the compensating circuit embodiment 2 of Switching Power Supply managing chipSchematic diagram.
Detailed description of the invention
For the ease of understanding the utility model, below with reference to relevant drawings, the utility model is carried out more comprehensivelyDescription. In accompanying drawing, provide first-selected embodiment of the present utility model. But the utility model can be to be permittedMany different forms realize, and are not limited to embodiment described herein. On the contrary, provide these enforcementThe object of example is to make to disclosure of the present utility model more thoroughly comprehensively.
It should be noted that, when an element is considered to " connection " another element, it can be direct connectionAlso be combined as a whole with it to another element, or may have centering elements simultaneously. Use hereinTerm " one end ", " other end " and similar statement are just for illustrative purposes.
Unless otherwise defined, all technology and the scientific terminology using herein and belong to of the present utility modelThe implication that those skilled in the art understand is conventionally identical. Institute in description of the present utility model hereinThe term using, just in order to describe the object of specific embodiment, is not intended to be restriction the utility model.Term as used herein " and/or " comprise one or more relevant Listed Items arbitrarily with allCombination.
The utility model is used for the compensating circuit embodiment 1 of Switching Power Supply managing chip:
In order to solve the power management chip VCC voltage of Switching Power Supply with the problem of load fluctuation, this realityProvide a kind of compensating circuit embodiment 1 for Switching Power Supply managing chip with novel; Fig. 2 is that this practicality is newType is for the structural representation of the compensating circuit embodiment 1 of Switching Power Supply managing chip; As shown in Figure 2, canTo comprise: be connected to the compensating module 110 between COMP pin 2 and the VCC pin 5 of Switching Power Supply;
Fig. 3 is the concrete structure of the utility model for the compensating circuit embodiment 1 of Switching Power Supply managing chipSchematic diagram; As shown in Figure 3, compensating module can comprise triode Q1, and the base stage of triode Q1 connects COMPPin 2; The colelctor electrode of triode Q1 connects VCC pin 5; The grounded emitter GND of triode Q1.
Wherein, in a specific embodiment, triode Q1 is NPN type triode.
The utility model embodiment 1 makes full use of the COMP pin voltage of power management chip and the pass of loadSystem, heavier when output loading, COMP voltage is higher. Therefore, load increases the weight of, and COMP voltage raises,Can slightly drag down the voltage of VCC by triode, realize compensation. Can effectively prevent VCC voltage withLoad significantly changes, and may push up the OVP point of VCC and the fault that causes while simultaneously also having avoided heavily loaded.
The utility model is used for the compensating circuit embodiment 2 of Switching Power Supply managing chip:
In order to solve the power management chip VCC voltage of Switching Power Supply with the problem of load fluctuation, this realityProvide a kind of compensating circuit embodiment 2 for Switching Power Supply managing chip with novel; Embodiment 2 and enforcementThe difference of example 1 is to have increased the first division module 120, the second division module 130 and filtration modules140; Fig. 4 is the structural representation of the utility model for the compensating circuit embodiment 2 of Switching Power Supply managing chipFigure; As shown in Figure 4, can also comprise:
Be connected to the first division module 120 between COMP pin 2 and the compensating module 110 of Switching Power Supply,Be connected to the second division module 130 between compensating module 110 and VCC pin 5, and one end and firstDivision module 120 is connected with compensating module 110, the filtration module 140 of other end ground connection;
Fig. 5 is the concrete structure of the utility model for the compensating circuit embodiment 2 of Switching Power Supply managing chipSchematic diagram, as shown in Figure 5:
The first division module 120 can comprise the first divider resistance R1 and the second divider resistance day R2; FirstOne end of divider resistance R1 connects COMP pin 2, the base stage of other end connecting triode Q1 and second pointOne end of piezoresistance R2; The other end ground connection GND of the second divider resistance R2.
In a specific embodiment, filtration module can comprise filter capacitor C1, filter capacitor C1'sThe base stage of one end connecting triode Q1, other end ground connection GND.
In a specific embodiment, filter capacitor C1 can be high-frequency filter capacitor.
In a specific embodiment, the second division module can comprise regulating resistance R3, regulating resistance R3Be connected between the colelctor electrode and VCC pin 5 of triode Q1.
In a specific embodiment, triode Q1 can be NPN type triode.
In order further to explain the technical solution of the utility model, taking the Switching Power Supply shown in Fig. 5 as example, thisThe compensating circuit of utility model comprises R1, R2, C1, Q1, R3 device. Connected mode is that R1, R2 willThe voltage of COMP pin is connected to the base stage of triode Q1 over the ground after dividing potential drop, and C1 connects base stage and the ground of triode,R3 connects the colelctor electrode of chip VCC pin and triode Q1.
Wherein R1, R2 are divider resistance, by regulating the ratio of R1 and R2, can adjust compensation VCCVoltage section, can carry out value according to the specification of the parameter of different chip manufacturers, transformer, triode.
C1 is filter capacitor, filtering noise information.
R3, for regulating divider resistance, can regulate the amplitude of triode compensation.
The utility model, for the compensating circuit embodiment 2 of Switching Power Supply managing chip, makes full use of power managementThe COMP pin voltage of chip and the relation of load, heavier when output loading, COMP voltage is higher. Therefore,When load increases the weight of, when COMP voltage raises, slightly drag down the electricity of VCC by the triode in compensating modulePress, realize compensation. By VCC voltage compensating circuit, can be according to load variations and compensation adjustment VCCVoltage. Can effectively prevent that VCC voltage from significantly changing with load, while also having avoided heavily loaded, may push up simultaneouslyTo the OVP point of VCC and the fault causing.
Each technical characterictic of the above embodiment can combine arbitrarily, for making to describe succinctly, not rightThe all possible combination of each technical characterictic in above-described embodiment is all described, but, as long as these skillsThere is not contradiction in the combination of art feature, is all considered to be the scope that this description is recorded.
The above embodiment has only expressed several embodiment of the present utility model, its describe comparatively concrete andIn detail, but can not therefore be interpreted as the restriction to utility model patent scope. It is right to it should be pointed out thatIn those of ordinary skill in the art, without departing from the concept of the premise utility, can also doGo out some distortion and improvement, these all belong to protection domain of the present utility model. Therefore, the utility model is specialThe protection domain of profit should be as the criterion with claims.
Claims (7)
1. for a compensating circuit for Switching Power Supply managing chip, it is characterized in that, described in comprising and being connected toCompensating module between COMP pin and the VCC pin of Switching Power Supply;
Described compensating module comprises triode, and the base stage of described triode connects described COMP pin; DescribedThe colelctor electrode of triode connects described VCC pin; The grounded emitter of described triode.
2. the compensating circuit for Switching Power Supply managing chip according to claim 1, is characterized in that,Also comprise first point of pressing mold between COMP pin and the described compensating module that is connected to described Switching Power SupplyPiece, is connected to the second division module between described compensating module and described VCC pin, and one end and instituteState the first division module and be connected with described compensating module, the filtration module of other end ground connection.
3. the compensating circuit for Switching Power Supply managing chip according to claim 2, is characterized in that,Described the first division module comprises the first divider resistance and the second divider resistance; One of described the first divider resistanceEnd connects described COMP pin, and the other end connects the base stage of described triode and described the second divider resistanceOne end; The other end ground connection of described the second divider resistance.
4. the compensating circuit for Switching Power Supply managing chip according to claim 2, is characterized in that,Described filtration module comprises filter capacitor, and one end of described filter capacitor connects the base stage of described triode, anotherOne end ground connection.
5. the compensating circuit for Switching Power Supply managing chip according to claim 4, is characterized in that,Described filter capacitor is high-frequency filter capacitor.
6. the compensating circuit for Switching Power Supply managing chip according to claim 2, is characterized in that,Described the second division module comprises regulating resistance, described regulating resistance be connected to described triode colelctor electrode andBetween described VCC pin.
7. according to the compensating circuit for Switching Power Supply managing chip described in claim 1 to 6 any one,It is characterized in that, described triode is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521082678.5U CN205265513U (en) | 2015-12-21 | 2015-12-21 | A compensating circuit for switching power supply management chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521082678.5U CN205265513U (en) | 2015-12-21 | 2015-12-21 | A compensating circuit for switching power supply management chip |
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| CN205265513U true CN205265513U (en) | 2016-05-25 |
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| CN201521082678.5U Active CN205265513U (en) | 2015-12-21 | 2015-12-21 | A compensating circuit for switching power supply management chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115395794A (en) * | 2022-10-27 | 2022-11-25 | 中科(深圳)无线半导体有限公司 | Power adapter circuit |
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2015
- 2015-12-21 CN CN201521082678.5U patent/CN205265513U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115395794A (en) * | 2022-10-27 | 2022-11-25 | 中科(深圳)无线半导体有限公司 | Power adapter circuit |
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