CN204794694U - Out put voltage control circuit and have power of this circuit - Google Patents
Out put voltage control circuit and have power of this circuit Download PDFInfo
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- CN204794694U CN204794694U CN201520411529.2U CN201520411529U CN204794694U CN 204794694 U CN204794694 U CN 204794694U CN 201520411529 U CN201520411529 U CN 201520411529U CN 204794694 U CN204794694 U CN 204794694U
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- comparator
- voltage signal
- trsanscondutance amplifier
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Abstract
The utility model discloses an out put voltage control circuit and have power of this circuit, wherein, the out put voltage control circuit includes: the error concealment circuit, the comparator, control logic circuit switches on the time -recorder, drive circuit, two inputs in the error concealment circuit connect feedback voltage signal and reference voltage signal respectively, and its two outputs connect two positive going input ends of comparator respectively, two negative sense inputs of comparator connect feedback voltage signal and reference voltage signal, comparator output termination control logic circuit first input end respectively, control logic circuit output termination drive circuit's input, drive circuit output switch manages control signal, switch on a time -recorder termination control logic circuit second input, another termination switch tube control signal. The utility model discloses an error concealment circuit detects feedback voltage average value and reference voltage error, dynamic adjustment reference voltage to reach the reduction error, improve invariable turn -on time control mode output voltage precision.
Description
Technical field
The utility model relates to electric and electronic technical field, particularly a kind of output voltage controlling circuit and have the power supply of this circuit.
Background technology
Along with electronic product development, also more and more higher to the requirement of power supply chip, not only require the supply power voltage that power supply chip can provide stable, conversion efficiency in high full-load range is provided, also has more and more higher requirement to the response speed of power supply chip and the diversity of application simultaneously.For extending battery life and lifting electronic product performance, need to design conversion efficiency high, the power management chip that mode of operation is various.Wherein, adopt constant on-time control mode (constanton-time, be called for short COT) combine pulse frequency modulated pattern (PulseFrequencyModulation, be called for short PFM) and hop cycle modulating mode (PulseSkipModulation, be called for short PSM) the power supply chip of control mode, not only control mode is comparatively simple, and can realize the controlled of switching frequency.Constant on-time control mode is also that a kind of PFM controls simultaneously, can automatically reduce switching frequency when underloading and carry out raising efficiency, the high efficiency conversion under full-load range can be realized, and do not need to carry out pattern switching, greatly simplifie the complexity of circuit design.
As shown in Figure 1, be the output voltage controlling circuit figure of COT control mode, the ripple that this circuit relies on output voltage carries out trigging control, works as feedback voltage V
fBlower than reference V
vREFthe upper power tube of Shi Kaiqi, the voltage at inductance L two ends becomes V
iN-V
oUT, inductive current I
lbecome large, output resistance R
eSRon voltage rise, and then make feedback voltage V
fBrise.The shortcoming of this control mode is due at every turn when output voltage drops to V
rEFbelow i.e. monostable circuit, the then lower edge of corresponding output voltage ripple and V
rEFbe worth equal, and the D. C. value of output voltage must higher than V
rEFvoltage.
Therefore, design inventor in the process of the output voltage controlling circuit of DC-DC power supply, find that in prior art, at least there are the following problems:
Existing DC-DC power supply output voltage controlling circuit adopts COT control mode output voltage precision not high.
Utility model content
In view of the above problems, propose the utility model to overcome the problems referred to above or to solve the problem at least in part, the technical solution of the utility model is achieved in that
On the one hand, the utility model provides a kind of output voltage controlling circuit, comprising: error canceling circuit, comparator, control logic circuit, conducting timer, drive circuit;
Two inputs of described error canceling circuit connect feedback voltage signal and reference voltage signal respectively, and two output connects two positive inputs of described comparator respectively;
Two negative inputs of described comparator connect feedback voltage signal and reference voltage signal respectively, the first input end of control logic circuit described in the output termination of described comparator;
The input of drive circuit described in the output termination of described control logic circuit, described drive circuit output switch pipe control signal;
Second input of control logic circuit described in described conducting timer one termination, switch controlled signal described in another termination.
Preferably, described error canceling circuit comprises: integrator;
Described integrator two inputs connect described feedback voltage signal, described reference voltage signal respectively;
Described integrator two outputs access positive input pin one and the pin two of described comparator respectively.
Preferably, described integrator comprises: first order trsanscondutance amplifier, second level trsanscondutance amplifier, the first electric capacity and sampling resistor;
Described first order trsanscondutance amplifier positive input connects described reference voltage signal; Described first order trsanscondutance amplifier negative input connects described feedback voltage signal; Described first order trsanscondutance amplifier exports first electric capacity one end and described second level trsanscondutance amplifier positive input described in termination;
Described first electric capacity other end ground connection;
Described second level trsanscondutance amplifier negative input connects described reference voltage signal, and described second level trsanscondutance amplifier exports the pin one of sampling resistor one end and described comparator positive input described in termination;
The pin two of comparator positive input described in another termination of described sampling resistor and pin 4 link of described comparator negative input.
Preferably, described integrator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration;
Described comparator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration.
Preferably, described conducting timer, by gathering described switch controlled signal, is determined switching tube ON time, and then is controlled the frequency of described switching tube.
On the other hand, the utility model provides a kind of power supply, comprising: output voltage controlling circuit; Described output voltage controlling circuit comprises: error canceling circuit, comparator, control logic circuit, conducting timer, drive circuit;
Two inputs of described error canceling circuit connect feedback voltage signal and reference voltage signal respectively, and two output connects two positive inputs of described comparator respectively;
Two negative inputs of described comparator connect feedback voltage signal and reference voltage signal respectively, the first input end of control logic circuit described in the output termination of described comparator;
The input of drive circuit described in the output termination of described control logic circuit, described drive circuit output switch pipe control signal;
Second input of control logic circuit described in described conducting timer one termination, switch controlled signal described in another termination.
Preferably, described error canceling circuit comprises: integrator;
Described integrator two inputs connect described feedback voltage signal, described reference voltage signal respectively;
Described integrator two outputs access positive input pin one and the pin two of described comparator respectively.
Preferably, described integrator comprises: first order trsanscondutance amplifier, second level trsanscondutance amplifier, the first electric capacity and sampling resistor;
Described first order trsanscondutance amplifier positive input connects described reference voltage signal; Described first order trsanscondutance amplifier negative input connects described feedback voltage signal; Described first order trsanscondutance amplifier exports first electric capacity one end and described second level trsanscondutance amplifier positive input described in termination;
Described first electric capacity other end ground connection;
Described second level trsanscondutance amplifier negative input connects described reference voltage signal, and described second level trsanscondutance amplifier exports the pin one of sampling resistor one end and described comparator positive input described in termination;
The pin two of comparator positive input described in another termination of described sampling resistor and pin 4 link of described comparator negative input.
Preferably, described integrator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration;
Described comparator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration.
Preferably, described conducting timer, by gathering described switch controlled signal, is determined switching tube ON time, and then is controlled the frequency of described switching tube.
The technical solution of the utility model detects the error of feedback voltage mean value and reference voltage by error canceling circuit, and reference voltage end that this error is added to, dynamic adjustments reference voltage, thus reach reduction error, improve constant on-time control mode output voltage precision.
Accompanying drawing explanation
Fig. 1 is a kind of output voltage controlling circuit figure in prior art;
A kind of output voltage controlling circuit figure that Fig. 2 provides for the utility model embodiment;
A kind of output voltage controlling circuit medial error that Fig. 3 provides for the utility model embodiment eliminates circuit diagram;
A kind of power supply architecture schematic diagram that Fig. 4 provides for the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model execution mode is described in further detail.
As a kind of output voltage controlling circuit figure that Fig. 2 provides for being depicted as the utility model embodiment; This output voltage controlling circuit comprises: error canceling circuit, comparator, control logic circuit, conducting timer, drive circuit;
Two inputs of described error canceling circuit connect feedback voltage signal and reference voltage signal respectively, and two output connects two positive inputs of described comparator respectively;
Two negative inputs of described comparator connect feedback voltage signal and reference voltage signal respectively, the first input end of control logic circuit described in the output termination of described comparator;
The input of drive circuit described in the output termination of described control logic circuit, described drive circuit output switch pipe control signal;
Second input of control logic circuit described in described conducting timer one termination, switch controlled signal described in another termination.
As shown in Figure 3, a kind of output voltage controlling circuit medial error provided for the utility model embodiment eliminates circuit; Described error canceling circuit comprises: integrator;
Described integrator two inputs meet described feedback voltage signal V respectively
fB, described reference voltage signal V
rEF;
Described integrator two outputs access positive input pin one and the pin two of described comparator respectively.
Described integrator comprises: first order trsanscondutance amplifier OTA1, second level trsanscondutance amplifier OTA2, the first electric capacity C1 and sampling resistor R
s;
Described first order trsanscondutance amplifier OTA1 positive input meets described reference voltage signal V
rEF; Described first order trsanscondutance amplifier OTA1 negative input meets described feedback voltage signal V
fB; Described first order trsanscondutance amplifier OTA1 output connects described first electric capacity C1 and described second level trsanscondutance amplifier OTA2 positive input respectively;
Described first electric capacity C1 other end ground connection;
Described second level trsanscondutance amplifier OTA2 negative input meets described reference voltage signal V
rEF, described second level trsanscondutance amplifier OTA2 output meets described sampling resistor R respectively
sand the pin one of described comparator positive input;
Described sampling resistor R
sthe pin two of comparator positive input described in another termination and pin 4 link of described comparator negative input.
It should be noted that, described integrator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration;
Described comparator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration.
Also it should be noted that, described conducting timer, by gathering described switch controlled signal, is determined switching tube ON time, and then is controlled the frequency of described switching tube.
Based on above circuit, utility model works principle is described in detail;
If described error canceling circuit can realize with integrating circuit, achieve V
fBand V
rEFvoltage error carries out integral operation.Comparator compares the voltage and VFB voltage that export from error canceling circuit, exports PWM waveform.Then export low and high level by control logic circuit, through the adjustment of overdrive circuit, output switch pipe control signal DH and DL signal, control cut-offfing of power tube.Meanwhile, switch controlled signal DH signal is switched on timer collection, finally determines ON time, and then the frequency of control switch pipe.
The schematic diagram of error canceling circuit as shown in Figure 3, wherein, feedback voltage V
fBwith reference voltage V
rEFas the input voltage of first order trsanscondutance amplifier OTA1, described first order trsanscondutance amplifier OTA1 is according to V
fBcompare V
rEFheight, or, V
fBcompare V
rEFlow different conditions is selected to charge to the first electric capacity C1, or, electric discharge, is namely achieved V by first order trsanscondutance amplifier OTA1 and the first electric capacity C1
fBand V
rEFvoltage error carry out integral operation, the voltage within a certain period of time on described first electric capacity C1 over time rule is:
Described first electric capacity C1 plays the effect of low pass filter, then the value of V1 equals V
fBdC quantity and V
rEFbetween the value of magnification of error.V1 again after the trsanscondutance amplifier OTA2 of the second level, output current I
swith sampling resistor R
sbe multiplied, and and V
rEFbe added, obtain the output voltage V of integrator
rEF ', as a positive input voltage of comparator.Then, comparator is input to; As long as described integrator gain is enough large, the object eliminating error voltage can be reached.
The first trsanscondutance amplifier OTA1 in the utility model, the second trsanscondutance amplifier OTA2 and comparator both can use bipolar junction transistor to build circuit realiration, and metal-oxide semiconductor fieldeffect transistor also can be used to build circuit realiration.
It should be noted that, the input signal of described conducting timer can from switch controlled signal DH, also can from switch controlled signal DL.
As shown in Figure 3, be a kind of power supply architecture schematic diagram that the utility model embodiment provides; This power supply comprises: output voltage controlling circuit; Described output voltage controlling circuit comprises: error canceling circuit, comparator, control logic circuit, conducting timer, drive circuit;
Two inputs of described error canceling circuit connect feedback voltage signal and reference voltage signal respectively, and two output connects two positive inputs of described comparator respectively;
Two negative inputs of described comparator connect feedback voltage signal and reference voltage signal respectively, the first input end of control logic circuit described in the output termination of described comparator;
The input of drive circuit described in the output termination of described control logic circuit, described drive circuit output switch pipe control signal;
Second input of control logic circuit described in described conducting timer one termination, switch controlled signal described in another termination.
Wherein, described error canceling circuit comprises: integrator;
Described integrator two inputs connect described feedback voltage signal, described reference voltage signal respectively;
Described integrator two outputs access positive input pin one and the pin two of described comparator respectively.
It should be noted that, described integrator comprises: first order trsanscondutance amplifier, second level trsanscondutance amplifier, the first electric capacity and sampling resistor;
Described first order trsanscondutance amplifier positive input connects described reference voltage signal; Described first order trsanscondutance amplifier negative input connects described feedback voltage signal; Described first order trsanscondutance amplifier exports first electric capacity one end and described second level trsanscondutance amplifier positive input described in termination;
Described first electric capacity other end ground connection;
Described second level trsanscondutance amplifier negative input connects described reference voltage signal, and described second level trsanscondutance amplifier exports the pin one of sampling resistor one end and described comparator positive input described in termination;
The pin two of comparator positive input described in another termination of described sampling resistor and pin 4 link of described comparator negative input.
Also it should be noted that, described integrator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration;
Described comparator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration.
Also it should be noted that, described conducting timer, by gathering described switch controlled signal, is determined switching tube ON time, and then is controlled the frequency of described switching tube.
The technical solution of the utility model detects the error of feedback voltage mean value and reference voltage by error canceling circuit, and reference voltage end that this error is added to, dynamic adjustments reference voltage, thus reach reduction error, improve constant on-time control mode output voltage precision, the ripple of this circuit on output voltage does not affect simultaneously.
The foregoing is only preferred embodiment of the present utility model, be not intended to limit protection range of the present utility model.All do within spirit of the present utility model and principle any amendment, equivalent replacement, improvement etc., be all included in protection range of the present utility model.
Claims (10)
1. an output voltage controlling circuit, is characterized in that, comprising: error canceling circuit, comparator, control logic circuit, conducting timer, drive circuit;
Two inputs of described error canceling circuit connect feedback voltage signal and reference voltage signal respectively, and two output connects two positive inputs of described comparator respectively;
Two negative inputs of described comparator connect feedback voltage signal and reference voltage signal respectively, the first input end of control logic circuit described in the output termination of described comparator;
The input of drive circuit described in the output termination of described control logic circuit, described drive circuit output switch pipe control signal;
Second input of control logic circuit described in described conducting timer one termination, switch controlled signal described in another termination.
2. output voltage controlling circuit according to claim 1, is characterized in that, described error canceling circuit comprises: integrator;
Described integrator two inputs connect described feedback voltage signal, described reference voltage signal respectively;
Described integrator two outputs access positive input pin one and the pin two of described comparator respectively.
3. output voltage controlling circuit according to claim 2, is characterized in that, described integrator comprises: first order trsanscondutance amplifier, second level trsanscondutance amplifier, the first electric capacity and sampling resistor;
Described first order trsanscondutance amplifier positive input connects described reference voltage signal; Described first order trsanscondutance amplifier negative input connects described feedback voltage signal; Described first order trsanscondutance amplifier exports first electric capacity one end and described second level trsanscondutance amplifier positive input described in termination;
Described first electric capacity other end ground connection;
Described second level trsanscondutance amplifier negative input connects described reference voltage signal, and described second level trsanscondutance amplifier exports the pin one of sampling resistor one end and described comparator positive input described in termination;
The pin two of comparator positive input described in another termination of described sampling resistor and the pin 4 of described comparator negative input.
4. the output voltage controlling circuit according to Claims 2 or 3, is characterized in that, described integrator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration;
Described comparator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration.
5. output voltage controlling circuit according to claim 4, is characterized in that, described conducting timer, by gathering described switch controlled signal, is determined switching tube ON time, and then controlled the frequency of described switching tube.
6. a power supply, is characterized in that comprising: output voltage controlling circuit; Described output voltage controlling circuit comprises: error canceling circuit, comparator, control logic circuit, conducting timer, drive circuit;
Two inputs of described error canceling circuit connect feedback voltage signal and reference voltage signal respectively, and two output connects two positive inputs of described comparator respectively;
Two negative inputs of described comparator connect feedback voltage signal and reference voltage signal respectively, the first input end of control logic circuit described in the output termination of described comparator;
The input of drive circuit described in the output termination of described control logic circuit, described drive circuit output switch pipe control signal;
Second input of control logic circuit described in described conducting timer one termination, switch controlled signal described in another termination.
7. power supply according to claim 6, is characterized in that, described error canceling circuit comprises: integrator;
Described integrator two inputs connect described feedback voltage signal, described reference voltage signal respectively;
Described integrator two outputs access positive input pin one and the pin two of described comparator respectively.
8. power supply according to claim 7, is characterized in that, described integrator comprises: first order trsanscondutance amplifier, second level trsanscondutance amplifier, the first electric capacity and sampling resistor;
Described first order trsanscondutance amplifier positive input connects described reference voltage signal; Described first order trsanscondutance amplifier negative input connects described feedback voltage signal; Described first order trsanscondutance amplifier exports first electric capacity one end and described second level trsanscondutance amplifier positive input described in termination;
Described first electric capacity other end ground connection;
Described second level trsanscondutance amplifier negative input connects described reference voltage signal, and described second level trsanscondutance amplifier exports the pin one of sampling resistor one end and described comparator positive input described in termination;
The pin two of comparator positive input described in another termination of described sampling resistor and the pin 4 of described comparator negative input.
9. the power supply according to claim 7 or 8, is characterized in that, described integrator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration;
Described comparator adopts bipolar junction transistor to build circuit realiration, or, adopt metal-oxide semiconductor fieldeffect transistor to build circuit realiration.
10. power supply according to claim 9, is characterized in that, described conducting timer, by gathering described switch controlled signal, is determined switching tube ON time, and then controlled the frequency of described switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520411529.2U CN204794694U (en) | 2015-06-15 | 2015-06-15 | Out put voltage control circuit and have power of this circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520411529.2U CN204794694U (en) | 2015-06-15 | 2015-06-15 | Out put voltage control circuit and have power of this circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204794694U true CN204794694U (en) | 2015-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520411529.2U Active CN204794694U (en) | 2015-06-15 | 2015-06-15 | Out put voltage control circuit and have power of this circuit |
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|---|---|
| CN (1) | CN204794694U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980023A (en) * | 2015-06-15 | 2015-10-14 | 青岛歌尔声学科技有限公司 | Output voltage controlling circuit and power supply provided with same |
| CN112152572A (en) * | 2020-09-30 | 2020-12-29 | 中国科学院微电子研究所 | Signal receiving circuit and signal transmission device capable of resisting ground potential drift |
-
2015
- 2015-06-15 CN CN201520411529.2U patent/CN204794694U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980023A (en) * | 2015-06-15 | 2015-10-14 | 青岛歌尔声学科技有限公司 | Output voltage controlling circuit and power supply provided with same |
| CN104980023B (en) * | 2015-06-15 | 2017-09-29 | 青岛歌尔声学科技有限公司 | A kind of output voltage controlling circuit and the power supply with the circuit |
| CN112152572A (en) * | 2020-09-30 | 2020-12-29 | 中国科学院微电子研究所 | Signal receiving circuit and signal transmission device capable of resisting ground potential drift |
| CN112152572B (en) * | 2020-09-30 | 2024-04-12 | 中国科学院微电子研究所 | Signal receiving circuit capable of resisting ground potential drift and signal transmission device |
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