CN201805351U - Control circuit for altering frequency of switching power supply - Google Patents
Control circuit for altering frequency of switching power supply Download PDFInfo
- Publication number
- CN201805351U CN201805351U CN2010202889633U CN201020288963U CN201805351U CN 201805351 U CN201805351 U CN 201805351U CN 2010202889633 U CN2010202889633 U CN 2010202889633U CN 201020288963 U CN201020288963 U CN 201020288963U CN 201805351 U CN201805351 U CN 201805351U
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- circuit
- power supply
- switching power
- threshold voltage
- oscillating
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Abstract
The utility model provides a control circuit capable of altering the frequency of a switching power supply, which comprises an oscillating circuit and a referential current generating circuit, wherein the oscillating circuit provides clock frequency signals for the switching power supply and the referential current generating circuit provides referential current for the oscillating circuit. The referential current generating circuit comprises an operational amplifier, an NMOS (N-Mental-Oxide-Semiconductor) source electrode tracker and an external variable resistor, wherein the external variable resistor is connected between the source electrode terminal and the grounding terminal of the NMOS source electrode tracker. By adopting the control circuit, limited electronic components and trunks of an external circuit are additionally arranged for realizing frequency adjustment to the switching power supply. Therefore, the power supply design is optimized in a targeted manner, the cost is lowered, and the loss of the switching power supply is effectively reduced and the service life of that is prolonged under the premise that high-efficiency and small size are achieved.
Description
Technical field
The utility model relates to a kind of stabilized voltage power supply control circuit, refers in particular to the external control circuit of the internal clocking frequency that can change Switching Power Supply.
Background technology
Provide clean for various products and stable power is very important by the rational stabilized voltage power supply of cost.Stabilized voltage power supply is unsettled power supply to be carried out voltage stabilizing handle.The switching frequency of Switching Power Supply is by the decision of the pierce circuit of inside, has a fixed frequency usually.
When the switching frequency of Switching Power Supply improves, can make the sensibility reciprocal of the filter inductance in the switching circuit, and the capacity of output capacitance descends.To certain inductance value, higher mains switch frequency can reduce the ripple of output voltage.To certain output voltage ripple value, higher switching frequency can reduce the numerical value and the volume of inductance.Therefore, the switching frequency of raising Switching Power Supply is good to the miniaturization of Switching Power Supply, and the volume that Switching Power Supply can design is littler, and efficient is higher.But, follow the raising of switching frequency, also can increase the loss of Switching Power Supply simultaneously; Because when the switching frequency of power supply improved, the bandwidth of power supply also improved thereupon, the ivr of power supply also can be accelerated.
Along with the electronic product (such as mobile phone, MP3 and MP4 etc.) that with the battery is power supply becomes more and more popular, to having high efficiency, the demand of small size power supply more and more increases.But under the prerequisite that guarantees high efficiency, small size, it is minimum how to make that the loss of this Switching Power Supply is reduced to, and still remains to be improved at present.
The circuit of the switching frequency of present traditional employed generation Switching Power Supply generally comprises oscillating circuit and the reference current generative circuit of reference current is provided for this oscillating circuit.As shown in Figure 1, be the reference current generative circuit of prior art institute extensive use.It comprises operational amplifier 1 ', nmos source tracker 2 ' and fixed value resistance 3 '.The normal phase input end of this operational amplifier 1 ' connects reference voltage V
Ref, its inverting input is connected with the source terminal of nmos source tracker 2 ', and its output is connected with the gate terminal of nmos source tracker 2 '; This fixed value resistance 3 ' is connected between the source terminal and earth terminal of nmos source tracker 2 '.
Because the normal phase input end of operational amplifier 1 ' and the magnitude of voltage of inverting input are identical in this circuit diagram, so the voltage that is applied on the fixed value resistance 3 ' also is V
Ref, can get thus, the reference current by fixed value resistance 3 ' is:
I
ref＝V
ref/R；
Wherein, R is the resistance value of fixed value resistance 3 '.
Reference current I by this reference current generative circuit generation
RefProvide operating current to oscillating circuit, and generate corresponding frequency of oscillation, just the switching frequency of switching circuit.From the above, because of reference current I
RefBe changeless, so the switching frequency of switching circuit also is changeless.
In view of this, it is a kind of simple that the utility model provides, and can change the control circuit of the internal frequency of Switching Power Supply from the outside, thereby the designing power supply that manufacturer can more be optimized is targetedly saved cost.
The utility model content
The purpose of this utility model provides a kind of control circuit that changes the Switching Power Supply frequency, it is by increasing limited electronic devices and components and the connection line of external circuit, realization is to the frequency adjustable of Switching Power Supply, can optimize the power supply design targetedly, reduce cost, and be implemented under the prerequisite that guarantees high efficiency, small size, make the loss of this Switching Power Supply effectively reduce, prolong its useful life.
To achieve these goals, the utility model provides a kind of control circuit that changes the Switching Power Supply frequency, and it comprises: for Switching Power Supply provides the oscillating circuit of clock frequency signal and the reference current generative circuit of reference current is provided for this oscillating circuit;
Described reference current generative circuit comprises operational amplifier, nmos source tracker and outside variable resistor; Wherein, the normal phase input end of this operational amplifier connects reference voltage, and its inverting input is connected with the source terminal of nmos source tracker, and its output is connected with the gate terminal of nmos source tracker; This outside variable resistor is connected between the source terminal and earth terminal of nmos source tracker.
Further, described reference current generative circuit also comprises an inner fixed value resistance, and itself and outside variable resistor are connected in parallel.
Described oscillating circuit comprises: select circuit by vibration charge-discharge circuit and threshold voltage that circuit connects.
Wherein, described vibration charge-discharge circuit comprises: by the vibration charging circuit of connecting with oscillating capacitance and constituting again after current mirror charging current source and the charging control switch series connection, the wherein other end ground connection of this oscillating capacitance; By the oscillating discharge circuit that constitutes in parallel with oscillating capacitance again after current mirror discharging current source and the discharge control switch series connection.
Described threshold voltage selects circuit to comprise threshold voltage logic selector and threshold voltage comparator; Wherein, the output of this threshold voltage comparator input connection threshold voltage logic selector; Another input of this threshold voltage comparator connects the non-earth terminal of oscillating capacitance; The output of this threshold voltage comparator feeds back respectively and connects charging control switch, discharge control switch and threshold voltage logic selector.
The utility model compared with prior art, its advantage is: by increasing limited electronic devices and components and the connection line of external circuit, optimize the power supply design targetedly, reduce cost, and be widely used in high efficiency and small size power supply.Frequency by reality adjustment Switching Power Supply can be implemented under the prerequisite that guarantees high efficiency, small size, makes the loss of this Switching Power Supply effectively reduce, and prolongs its useful life.
Description of drawings
Fig. 1 is the circuit diagram of reference current generative circuit in the prior art;
Fig. 2 is the circuit diagram of a kind of embodiment of reference current generative circuit in the utility model;
Fig. 3 is the circuit diagram of the another kind of embodiment of reference current generative circuit in the utility model;
Fig. 4 is the circuit diagram of oscillating circuit in the utility model.
Embodiment
Below in conjunction with Fig. 2 to Fig. 4, describe the utility model preferred embodiment in detail.
The utility model provides a kind of control circuit that changes the Switching Power Supply frequency, and it comprises: oscillating circuit and the reference current generative circuit of reference current is provided for this oscillating circuit.
As shown in Figure 2, be the circuit diagram of the reference current generative circuit 101 in the utility model, it comprises operational amplifier 1, nmos source tracker 2 and outside variable resistor 3.The normal phase input end of this operational amplifier connects reference voltage V
Ref, its inverting input is connected with the source terminal of nmos source tracker 2, and its output is connected with the gate terminal of nmos source tracker 2; This outside variable resistor 3 is connected between the source terminal and earth terminal of nmos source tracker 2.
Because the normal phase input end of operational amplifier 1 and the magnitude of voltage of inverting input are identical in this circuit diagram, so the voltage that is applied on the outside variable resistor 3 also is V
Ref, can get thus, the reference current by variable resistor 3 is:
I
ref＝V
ref/R
ext；
Wherein, R
ExtCurrent resistance value for variable resistor 3.
Therefore, in the utility model, as the resistance R that regulates outside variable resistor 3
ExtThe time, the reference current I that is generated
RefValue also can correspondingly change.
Preferred embodiment of the present utility model also provides another reference current generative circuit 102, and its physical circuit figure sees also Fig. 3.This reference current generative circuit 102 is compared with above-mentioned reference current generating circuit 101, and unique difference is that this reference current generative circuit 102 also comprises an inner fixed value resistance 4, and itself and outside variable resistor 3 are connected in parallel.Can get thus, the reference current that this circuit generated is:
I
Ref=V
Ref/ R
And
R
And=R
Ext//R
Int
Wherein, R
IntResistance value for inner fixed value resistance 4; R
AndBe outside variable resistor 3 and inner fixed value resistance 4 resistance value after in parallel.
Therefore, in the utility model, as the resistance R that regulates outside variable resistor 3
ExtThe time, the reference current I that is generated
RefValue also can correspondingly change.When this reference current generative circuit 12 did not connect outside variable resistor 3, the resistance of inner fixed value resistance 4 had promptly determined minimum reference current I
RefAnd when by regulate increasing the current resistance of outside variable resistor 3, when making itself and inner fixed value resistance 4 in parallel, because of the total resistance value R after the parallel connection
AndCan be than R
IntReduce, then reference current I
RefAlso can increase thereupon.
As shown in Figure 4, be the schematic diagram of oscillating circuit in the utility model, this oscillating circuit provides clock frequency signal for Switching Power Supply.It comprises: select circuit by vibration charge-discharge circuit and threshold voltage that circuit connects.
Wherein, described vibration charge-discharge circuit comprises: by the vibration charging circuit of connecting and constituting with oscillating capacitance 7 again after current mirror charging current source 5 and charging control switch 8 series connection, the wherein other end ground connection of this oscillating capacitance 7; By after 9 series connection of current mirror discharging current source 6 and discharge control switch again with the oscillating capacitance 7 oscillating discharge circuit that constitute in parallel.
Described threshold voltage selects circuit to comprise threshold voltage logic selector 10 (in the present embodiment, can adopt a logic selector switch to realize) and threshold voltage comparator 11; This threshold voltage logic selector 10 has 2 pre-set threshold magnitude of voltage V
CeilingAnd V
Bottom, its output connects one of them input of threshold voltage comparator 11; Another input of this threshold voltage comparator 11 connects the non-earth terminal of oscillating capacitance 7, and the output of this this threshold voltage comparator 11 feeds back respectively and connects charging control switch 8, discharge control switch 9 and threshold voltage logic selector 10.
Reference current I by aforesaid reference current generative circuit generation
RefBy the method for current mirror (currentmirror), produce electric current I by current mirror charging current source 5 and current mirror discharging current source 6 respectively
UpAnd I
DownCurrent mirror described herein be a kind of commonly used, produce and reference current has the method that certain proportion concerns electric current by reference current, therefore, I
UpAnd I
DownBe can be according to reference current I
RefChange change.Wherein, electric current I
UpBe used for to oscillating capacitance 7 chargings, and electric current is used for to oscillating capacitance 7 discharges.
When charging control switch 8 is closed, by current mirror charging current source 5 according to reference current I
RefThe electric current I that generates
UpGive oscillating capacitance 7 chargings, thereby make the voltage that is applied to these oscillating capacitance 7 two ends raise.When discharge control switch 9 is closed, by current mirror discharging current source 6 according to reference current I
RefThe electric current I that generates
DownGive oscillating capacitance 7 discharges, thereby make the voltage that is applied to these oscillating capacitance 7 two ends reduce.I
Down/ I
UpBetween ratio determined the clock duty cycle of Switching Power Supply.Threshold voltage comparator 11 is used for determining the virtual voltage on the oscillating capacitance 7 and the COV of threshold voltage.Threshold voltage comparator 11 has two threshold voltage: V
CeilingAnd V
BottomThreshold voltage logic selector 10 is used for selecting threshold voltage into threshold voltage comparator 11.
When charging control switch 8 closures were given oscillating capacitance 7 chargings, threshold voltage logic selector 10 was selected V
CeilingAs the threshold value of voltage comparator 11, the voltage at these oscillating capacitance 7 two ends will increase this moment, when this magnitude of voltage surpasses V
CeilingThe time, the feedback output end of voltage comparator 11 will be controlled charging control switch 8 and open, and closed discharge control switch 9, the discharge process of complete charge process, and beginning thus; Meanwhile, the feedback output end of this voltage comparator 11 also will be controlled threshold voltage logic selector 10 and select V
BottomThreshold value as the voltage comparator in the discharge process 11.In discharge process, the voltage at oscillating capacitance 7 two ends will reduce, until its magnitude of voltage less than V
BottomThe time, the feedback output end of voltage comparator 11 will be controlled discharge control switch 9 and open, and closed charging control switch 8, finish discharge process thus, and circulation begins charging process once more.
Thus, the clock charging interval of Switching Power Supply is: T
On=C
Osc* (V
Ceiling-V
Bottom)/I
UpAnd the clock of Switching Power Supply is discharge time: T
Off=C
Osc* (V
Ceiling-V
Bottom)/I
DownWherein, C
OscCapacitance for oscillating capacitance 7.Thereby can get, the clock cycle of this Switching Power Supply is by T
OnAnd T
OffThe addition gained, corresponding, the switching frequency of this Switching Power Supply is 1/T
On+ T
OffSo, if regulate electric current I accordingly
UpAnd I
Down, the switching frequency of Switching Power Supply also can change thereupon so.
From above-mentioned description, be not difficult to find,,, can change reference current I by regulating its resistance owing in the reference current generative circuit, be provided with outside variable resistor 3
RefValue.Again because of the charging and the discharging current I that generate by current mirror
UpAnd I
DownBe and reference current I
RefProportional change, final, with make Switching Power Supply the clock charging and change discharge time thereupon, thereby make that the switching frequency realization of Switching Power Supply is adjustable.Particularly, when increasing the resistance of outside variable resistor 3, reference current I
RefTo increase, meanwhile, charging and discharging current I
UpAnd I
DownAlso with proportional increase, thus make Switching Power Supply the clock charging and discharge time T
OnAnd T
OffReduce, and finally improve the switching frequency of Switching Power Supply.Otherwise, when reducing the resistance of outside variable resistor 3, in like manner can reduce the switching frequency of Switching Power Supply.
In sum, the utility model provides a kind of control circuit that can change the Switching Power Supply frequency from the outside, by increasing limited electronic devices and components and connection line, optimizes the power supply design targetedly, reduce cost, and be widely used in high efficiency and small size power supply.Frequency by reality adjustment Switching Power Supply can be implemented under the prerequisite that guarantees high efficiency, small size, makes the loss of this Switching Power Supply effectively reduce, and prolongs its useful life.
Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute all will be conspicuous.Therefore, protection range of the present utility model should be limited to the appended claims.
Claims (5)
1. control circuit that is used to change the Switching Power Supply frequency comprises: for Switching Power Supply provides the oscillating circuit of clock frequency signal and the reference current generative circuit of reference current is provided for this oscillating circuit; It is characterized in that,
Described reference current generative circuit comprises operational amplifier (1), nmos source tracker (2) and outside variable resistor (3); Wherein,
The normal phase input end of this operational amplifier (1) connects reference voltage, and its inverting input is connected with the source terminal of nmos source tracker (2), and its output is connected with the gate terminal of nmos source tracker (2);
This outside variable resistor (3) is connected between the source terminal and earth terminal of nmos source tracker (2).
2. the control circuit that is used to change the Switching Power Supply frequency as claimed in claim 1 is characterized in that, described reference current generative circuit also comprises an inner fixed value resistance (4), and itself and outside variable resistor (3) are connected in parallel.
3. the control circuit that is used to change the Switching Power Supply frequency as claimed in claim 1 or 2 is characterized in that, described oscillating circuit comprises: select circuit by vibration charge-discharge circuit and threshold voltage that circuit connects.
4. the control circuit that is used to change the Switching Power Supply frequency as claimed in claim 3 is characterized in that, described vibration charge-discharge circuit comprises:
By the vibration charging circuit of connecting with oscillating capacitance (7) again and constituting after current mirror charging current source (5) and charging control switch (8) series connection, the wherein other end ground connection of this oscillating capacitance (7);
By after the series connection of current mirror discharging current source (6) and discharge control switch (9) again with the oscillating discharge circuit of oscillating capacitance (7) formation in parallel.
5. the control circuit that is used to change the Switching Power Supply frequency as claimed in claim 4 is characterized in that, described threshold voltage selects circuit to comprise threshold voltage logic selector (10) and threshold voltage comparator (11); Wherein,
An input of this threshold voltage comparator (11) connects the output of threshold voltage logic selector (10);
Another input of this threshold voltage comparator (11) connects the non-earth terminal of oscillating capacitance (7);
The output of this threshold voltage comparator (11) feeds back respectively and connects charging control switch (8), discharge control switch (9) and threshold voltage logic selector (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202889633U CN201805351U (en) | 2010-08-12 | 2010-08-12 | Control circuit for altering frequency of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202889633U CN201805351U (en) | 2010-08-12 | 2010-08-12 | Control circuit for altering frequency of switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201805351U true CN201805351U (en) | 2011-04-20 |
Family
ID=43874851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202889633U Expired - Lifetime CN201805351U (en) | 2010-08-12 | 2010-08-12 | Control circuit for altering frequency of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201805351U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107466439A (en) * | 2015-02-14 | 2017-12-12 | 天工方案公司 | It is quick to start high voltage boosting |
| JP2019021608A (en) * | 2017-07-20 | 2019-02-07 | ゼジャン・ゴッドセンド・パワー・テクノロジー・カンパニー・リミテッド | System and control device for charging and discharging lithium ion battery, and relevant method |
| CN110890868A (en) * | 2018-09-07 | 2020-03-17 | 圣邦微电子（北京）股份有限公司 | Resistance circuit and variable gain amplifying circuit |
| CN111293881A (en) * | 2020-02-11 | 2020-06-16 | 中国安全生产科学研究院 | Control circuit |
| US11218116B2 (en) | 2019-10-03 | 2022-01-04 | Skyworks Solutions, Inc. | Fast ramping power amplifier boost converter |
-
2010
- 2010-08-12 CN CN2010202889633U patent/CN201805351U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107466439A (en) * | 2015-02-14 | 2017-12-12 | 天工方案公司 | It is quick to start high voltage boosting |
| US10420042B2 (en) | 2015-02-14 | 2019-09-17 | Skyworks Solutions, Inc. | Quick-start high-voltage boost |
| CN107466439B (en) * | 2015-02-14 | 2020-07-28 | 天工方案公司 | Fast start high voltage boost |
| JP2019021608A (en) * | 2017-07-20 | 2019-02-07 | ゼジャン・ゴッドセンド・パワー・テクノロジー・カンパニー・リミテッド | System and control device for charging and discharging lithium ion battery, and relevant method |
| US10256512B2 (en) | 2017-07-20 | 2019-04-09 | Zhejiang Godsend Power Technology Co., Ltd. | Systems and control devices for charging and discharging lithium-ion battery, and relevant methods |
| CN110890868A (en) * | 2018-09-07 | 2020-03-17 | 圣邦微电子（北京）股份有限公司 | Resistance circuit and variable gain amplifying circuit |
| CN110890868B (en) * | 2018-09-07 | 2023-09-12 | 圣邦微电子（北京）股份有限公司 | Resistor circuit and variable gain amplifier circuit |
| US11218116B2 (en) | 2019-10-03 | 2022-01-04 | Skyworks Solutions, Inc. | Fast ramping power amplifier boost converter |
| US11476806B2 (en) | 2019-10-03 | 2022-10-18 | Skyworks Solutions, Inc. | Jump-start power amplifier boost converter |
| CN111293881A (en) * | 2020-02-11 | 2020-06-16 | 中国安全生产科学研究院 | Control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JUCHEN SEMICONDUCTOR (SHANGHAI) CO., LTD. Free format text: FORMER OWNER: MEILING MICROELECTRONICS SHANGHAI CO., LTD. Effective date: 20111028 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20111028 Address after: Songtao Lu Pudong New Area Zhangjiang hi tech park Shanghai 201203 Lane 647 No. 12 Patentee after: Giantec Semiconductor Inc. Address before: 201203 Shanghai city Pudong New Area road 887 Lane 72 Zuchongzhi Room 201 No. Patentee before: Meiling Microelectronics (Shanghai) Co., Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 201203 No. 12, Lane 647, Songtao Road, China (Shanghai) Free Trade Pilot Area, Pudong New Area, Shanghai Patentee after: Juchen Semiconductor Co., Ltd. Address before: 201203 No. 12, Lane 647, Songtao Road, Zhangjiang High-tech Park, Pudong New Area, Shanghai Patentee before: Giantec Semiconductor Inc. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110420 |