CN202663301U - Digital power supply control circuit and digital power supply applying same - Google Patents
Digital power supply control circuit and digital power supply applying same Download PDFInfo
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- CN202663301U CN202663301U CN 201220220956 CN201220220956U CN202663301U CN 202663301 U CN202663301 U CN 202663301U CN 201220220956 CN201220220956 CN 201220220956 CN 201220220956 U CN201220220956 U CN 201220220956U CN 202663301 U CN202663301 U CN 202663301U
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Abstract
The utility model relates to a digital power supply control circuit, which is applied to a digital power supply. In the digital power supply control circuit, an analog/digital converter is used for receiving output voltage of the digital power supply, and the value of the output voltage is compared with n reference values to generate a digital error signal, wherein n is not smaller than 3; and then, a digital duty cycle signal is generated according to the received digital error signal, and a dynamic component is transmitted to the analog/digital converter to regulate the group of reference values; and a DPWM module is used to generate a PWM signal to control the switching action of a power switch in the digital power supply according to the received digital duty cycle signal, so that the output voltage of the digital power supply is ensured to recover to the expected output voltage rapidly.
Description
Technical field
The utility model relates to field of switch power, relates in particular to a kind of control circuit of novel digital power and the digital power of using it.
Background technology
Switching Power Supply is to utilize modern power electronics technology, and the time ratio that the control switch pipe turns on and off is kept a kind of power supply of regulated output voltage, and Switching Power Supply generally is made of pulse width modulation (PWM) control IC and power switch (MOSFET).The implementation of existing Switching Power Supply comprises analog control mode, digital control approach and modulus mixed-control mode.Adopt the Switching Power Supply of analog control technique, the output feedback voltage produces error signal through error amplifier, compares to produce PWM with the triangular wave oscillation signal and drive signal after the pid correction compensation.Such implementation, control circuit is complicated, and component number is many, is difficult to after the control circuit moulding make amendment again, is unfavorable for the integrated and miniaturization of Switching Power Supply.In recent years, because digital control approach is programmable, but the design continuity, the advantage such as component number is few and more and more be used widely and approve.
Adopt digital control approach, the control loop of digital power has been realized digitlization fully, and feedback voltage signal is finished pid correction compensation and pwm signal adjusting by the plug-in of dsp chip after analog to digital converter is converted to digital signal.A kind of digital power that adopts traditional digital control approach as shown in Figure 1 compares output voltage and single fiducial value by analog to digital converter ADC 11, then is converted to digital signal; Compensating circuit 12 compensates control algorithm according to described comparative result n_digital, produces corresponding digital duty cycle signals D_digital; It is that pwm control signal comes the power switch S in the main power stage circuit 14 of control figure power supply that the digital duty cycle signals D_digital that DPWM module 13 will receive is converted to square wave driving signal
oSwitch motion, and then come regulation output voltage.But, adopt this digital control approach, analog to digital converter ADC 11 and DPWM module 13 are fixing circuit structure, therefore steady-state behaviour and the dynamic property of digital power are all realized by compensating circuit 12, so that the compensation flexibility ratio of digital power is not good, the dynamic response performance of digital power is relatively poor.
The utility model content
In view of this, the purpose of this utility model is to provide a kind of novel digital power control circuit, the fiducial value of utilizing the dynamic component of compensating signal to regulate in real time analog to digital converter ADC improves the governing speed of digital power control circuit, has improved the dynamic response performance of digital power.
A kind of digital power control circuit according to an embodiment of the present utility model is applied to comprise in the digital power:
Analog to digital converter in order to receiving the output voltage of described digital power, and compares with n fiducial value, and comparative result is converted to the current output voltage that characterizes described digital power and the digital error signal of the error between the desired output voltage, n 〉=3;
Digital compensation circuit receives described digital error signal, with the digital duty cycle signals of corresponding generation; The dynamic component of wherein said digital duty cycle signals is passed to described analog to digital converter, with the numerical value of the described one group of fiducial value of corresponding change;
The DPWM module, according to the described digital duty cycle signals that receives, produce pwm control signal and control the switch motion of the power switch in the described digital power, the output voltage that guarantees described digital power is consistent with desired output voltage, and, when the output voltage of described digital power and desired output voltage are inconsistent, guarantee that the output voltage of described digital power returns to described desired output voltage fast.
Further, the number n of described fiducial value is odd number, and the numerical value of a described n fiducial value is distributed in the both sides of the desired output voltage of described digital power centered by the desired output voltage of described digital power.
Further, described analog to digital converter comprises n comparator, and the first input end of a described n comparator receives the output voltage of described digital power, and the second input receives respectively a described n fiducial value.
Further, described analog to digital converter comprises digital decoder, in order to receiving the output signal of a described n comparator, and described output signal is converted to described digital error signal.
Further, described analog to digital converter comprises and described n fiducial value n digital to analog converter one to one;
According to the dynamic component of described digital duty cycle signals and (n-1)/2 magnitude relationship of a reference value, regulate the input signal of a described n digital to analog converter; Wherein, the numerical value of described (n-1)/2 reference value arranges according to the desired output electric current of described digital power, and successively decreases successively;
When the dynamic component of described digital duty cycle signals during less than (n-1)/2 reference value, a described n digital to analog converter is kept current state;
When the dynamic component of described digital duty cycle signals during greater than the first reference value, then the input signal of a described n digital to analog converter all subtracts 1;
Greater than the second reference value, then the input signal of the second digital to analog converter to the n-1 digital to analog converter all subtracts 1 less than the first reference value when the dynamic component of described digital duty cycle signals;
Greater than the 3rd reference value, then the input signal of the 3rd digital to analog converter to the n-2 digital to analog converter all subtracts 1 less than the second reference value when the dynamic component of described digital duty cycle signals;
The like, greater than the k+1 reference value, then the input signal of k+1 digital to analog converter to the n-k digital to analog converter all subtracts 1 less than the k reference value when the dynamic component of described digital duty cycle signals;
The output signal of a described n digital to analog converter is as a described n fiducial value.
Further, described analog to digital converter also comprises n counter and (n-1)/2 register; Wherein, described (n-1)/2 reference value is stored in respectively in the register of described (n-1)/2; A described n counter and a described n digital to analog converter connect one to one.
According to a kind of digital power of the utility model one embodiment, comprise arbitrary digital power control circuit described above, also comprise power stage circuit; The pwm control signal of described digital power control circuit output is controlled the switch motion of the power switch in the described digital power, the output voltage that guarantees described digital power is consistent with desired output voltage, and, when the output voltage of described digital power and desired output voltage are inconsistent, guarantee that the output voltage of described digital power returns to described desired output voltage fast.
Digital power control circuit according to the utility model embodiment, a plurality of fiducial values of regulating in real time analog to digital converter ADC with the dynamic component of the digital duty cycle signals of compensating circuit, described dynamic component has characterized the control information of the current output voltage of digital power, therefore, utilize described dynamic component to the conditioned reaction of fiducial value current control information.When described dynamic component hour, corresponding also less to the adjusting of fiducial value; When described dynamic component is larger, the adjusting of fiducial value is increased accordingly.Make the output of analog to digital converter ADC can follow fast the control information of current output voltage by this adjusting, thereby come this control information is responded fast by follow-up compensating circuit, namely regulate fast described digital duty cycle signals, realize the quick adjustment to the power switch of digital power, output voltage has obtained adjusting fast thereupon, has significantly improved the dynamic response performance of digital power.
Description of drawings
Figure 1 shows that the theory diagram of a kind of digital power in the prior art;
Figure 2 shows that the theory diagram according to the digital power control circuit of the utility model one embodiment;
Figure 3 shows that the theory diagram according to the digital power control circuit of another embodiment of the utility model;
Figure 4 shows that the theory diagram according to the digital power of the utility model one embodiment.
Embodiment
Below in conjunction with accompanying drawing several preferred embodiments of the present utility model are described in detail, but the utility model is not restricted to these embodiment.The utility model is contained any in substituting of making of marrow of the present utility model and scope, modification, equivalent method and scheme.Understand for the public is had thoroughly the utility model, in following the utility model preferred embodiment, describe concrete details in detail, and do not have for a person skilled in the art the description of these details also can understand the utility model fully.
With reference to figure 2, be depicted as the theory diagram according to the digital power control circuit of the utility model one embodiment.In this embodiment, digital power control circuit 200 comprises analog to digital converter ADC 23, digital compensation circuit 22 and DPWM module 21.
Wherein, analog to digital converter 23 receives the output voltage V of digital power
Out, and with n fiducial value (V
Ref1, V
Ref2, V
Ref3... V
Refn) compare, comparative result is converted to the current output voltage of the described digital power of sign and the digital error signal E_digital of the error between the desired output voltage, and the n value is n 〉=3 here;
Further, the number of a described n fiducial value is odd number, and the numerical value of a described n fiducial value is distributed in the both sides of the desired output voltage of described digital power centered by the desired output voltage of described digital power.For example, a described n fiducial value can be set to arithmetic progression, and the numerical value of (n+1)/2 fiducial value is consistent with described desired output voltage, and then a described n fiducial value is evenly distributed on the both sides of described desired output voltage centered by described desired output voltage.Those skilled in the art can learn that according to instruction of the present utility model the number range of n fiducial value of other any suitable forms all goes for embodiment of the present utility model.
Digital compensation circuit 22 receives described digital error signal E_digital, and produces according to this corresponding digital duty cycle signals D_digital; Wherein the dynamic component Δ D_digital feed back input of digital duty cycle signals D_digital comes adjusting n real-time fiducial value (V to analog to digital converter 23
Ref1, V
Ref2, V
Ref3... V
Refn) numerical value;
Here, analog to digital converter ADC 23 can comprise fiducial value circuit for generating 201, n comparator (202-2,202-2,202-3......202-n) and digital decoder 203.
Fiducial value circuit for generating 201 is regulated n fiducial value (V in real time according to the dynamic component Δ D_digital of the described digital duty cycle signals in the digital power that receives
Ref1, V
Ref2, V
Ref3... V
Refn) numerical value.The dynamic component Δ D_digital of described digital duty cycle signals characterizes the current output voltage of digital power and the control information between the desired output voltage.When the dynamic component Δ D_digital of described digital duty cycle signals hour, the current output voltage and the error between the desired output voltage that characterize digital power are less, therefore, at this moment only to n fiducial value (V
Ref1, V
Ref2, V
Ref3... V
Refn) in the part value regulate.When the dynamic component Δ D_digital of described digital duty cycle signals was larger, the current output voltage and the error between the desired output voltage that characterize digital power were larger, therefore, and at this moment with n fiducial value (V
Ref1, V
Ref2, V
Ref3... V
Refn) in whole or most of values regulate.
The inverting input of n comparator (202-1,202-2,202-3......202-n) receives respectively the output voltage V out of digital power, also can be the feedback voltage that characterizes the output voltage of digital power, and in-phase input end receives respectively described n fiducial value (V
Ref1, V
Ref2, V
Ref3... V
Refn), the output signal of n comparator (202-1,201-2,201-3......201-n) has characterized the control information between current output voltage and the desired output voltage.
The output signal of described n the comparator (202-1,201-2,201-3......201-n) that digital decoder 203 will receive is converted to digital error signal E_digital, then inputs to digital compensation circuit 22.
As seen, digital power control circuit according to the utility model embodiment shown in Figure 2, a plurality of fiducial values of regulating in real time analog to digital converter ADC with the dynamic component of the digital duty cycle signals of digital compensation circuit 22, described dynamic component has characterized the control information of the current output voltage of digital power, therefore, utilize described dynamic component to the conditioned reaction of fiducial value current control information.When described dynamic component hour, corresponding also less to the adjusting of fiducial value, when described dynamic component is larger, the adjusting of fiducial value is increased accordingly.Make the output of analog to digital converter ADC can follow fast the control information of current output voltage by above-mentioned adjusting to fiducial value, thereby come this control information is responded fast by follow-up compensating circuit, namely regulate fast described digital duty cycle signals, realize the quick adjustment to the power switch of digital power, output voltage has obtained adjusting fast thereupon, has significantly improved the dynamic response performance of digital power.
With reference to figure 3, be depicted as the theory diagram according to the digital power control circuit of another embodiment of the utility model.This embodiment further describes a kind of specific implementation of reference voltage generating circuit in detail on the basis of embodiment shown in Figure 2.Below will be described in detail the operation principle of reference voltage generating circuit, the part identical with embodiment shown in Figure 2 will repeat no more.
In this embodiment, described reference voltage generating circuit 201 comprises n digital to analog converter (DAC1, DAC2, DAC3......DACn), n counter, (n-1)/2 register and processor DSP.Wherein, described (n-1)/2 register has respectively (n-1)/2 a reference value (REF1 accordingly, REF2, REF3......REF (n-1)/2), the numerical value of described (n-1)/2 reference value successively decreases successively, and carries out relative set according to the desired output voltage of described digital power; For example, can be chosen as the arithmetic progression that successively decreases.A described n counter respectively with a corresponding n digital to analog converter (DAC1, DAC2, DAC3......DACn) in one be connected.
The dynamic component Δ D_digital of described digital duty cycle signals and described (n-1)/2 reference value (REF1, REF2, REF3......REF (n-1)/2) are carried out numerical value and are compared in processor DSP,
When described dynamic variable during less than (n-1)/2 reference value, the input signal of a described n digital to analog converter is kept current state;
As the dynamic component Δ D_digital of described digital duty cycle signals during greater than the first reference value REF1, then the input signal of a described n digital to analog converter all subtracts 1 by counter 1 to counter n;
Greater than the second reference value REF2, then the input signal of the second digital to analog converter to the n-1 digital to analog converter all subtracts 1 by counter 2 to counter (n-1) less than the first reference value REF1 as the dynamic component Δ D_digital of described digital duty cycle signals;
Greater than the 3rd reference value REF3, then the input signal of the 3rd digital to analog converter to the n-2 digital to analog converter all subtracts 1 by counter 3 to counter (n-2) less than the second reference value REF2 as the dynamic component Δ D_digital of described digital duty cycle signals;
The like, as the dynamic component Δ D_digital of described digital duty cycle signals less than k reference value REFk greater than k+1 reference value REF(k+1), then the input signal of k+1 digital to analog converter to the n-k digital to analog converter all subtracts 1 by counter k+1 to counter n-k;
The output signal of a described n digital to analog converter is as described n fiducial value (V
Ref1, V
Ref2, V
Ref3... V
Refn).
Digital power control circuit according to the utility model embodiment shown in Figure 3, n the fiducial value that the dynamic component of the digital duty cycle signals of usefulness digital compensation circuit 22 is regulated analog to digital converter ADC in real time.According to the dynamic component of Contemporary Digital duty cycle signals in (n-1)/2 a reference value (REF1, REF2, REF3......REF (n-1)/2) position in the number range of expression, come to obtain the set of number signal by counter accordingly, obtain described n fiducial value (V by the digital to analog converter conversion again
Ref1, V
Ref2, V
Ref3... V
Refn).
Described dynamic component has characterized the control information of the current output voltage of digital power, therefore, utilize described dynamic component to the conditioned reaction of fiducial value current control information, when described dynamic component hour, corresponding also less to the adjusting of fiducial value, when described dynamic component is larger, the adjusting of fiducial value is increased accordingly.Therefore, the output of analog to digital converter ADC can be followed the control information of current output voltage fast, thereby come this control information is responded fast by follow-up compensating circuit, namely regulate fast described digital duty cycle signals, realize the quick adjustment to the power switch of digital power, output voltage has obtained adjusting fast thereupon, has significantly improved the dynamic response performance of digital power.
With reference to figure 4, be depicted as the theory diagram according to a kind of digital power of the utility model one embodiment.In this embodiment, described digital power 600 comprises power stage circuit 601 and digital power control circuit 602.Wherein, power stage circuit 601 can be for comprising power switch, rectifier switch, the voltage-dropping type of inductance and filter circuit, booster type, voltage boosting-reducing type or isolated topological structure; Digital power control circuit 602 can be for the arbitrary digital power control circuit according to the utility model embodiment described above, such as Fig. 2 and Fig. 3, and based on the reasonable distortion of the disclosed above-described embodiment of the utility model.
The pwm control signal of described digital power control circuit output is controlled the switch motion of the power switch in the described digital power, the output voltage that guarantees described digital power is consistent with desired output voltage, and, when the output voltage of described digital power and desired output voltage are inconsistent, guarantee that the output voltage of described digital power returns to described desired output voltage fast.
Need to prove, the device function that title is identical between each embodiment of the utility model is also identical, and changes progressive embodiment and can carry out combination with above-mentioned a plurality of related embodiment respectively, but only illustrates on the basis of a upper embodiment during explanation.And; below only be the digital power control circuit in the present embodiment is described as example such as Fig. 2 circuit shown in Figure 3;, the structure of these two kinds of circuit is not limited to above disclosed form but comprising; as long as can realize the function of the described interlock circuit of the utility model embodiment; therefore; the relevant improvement that those skilled in the art do on the basis of the disclosed circuit of the utility model embodiment is also within the protection range of the utility model embodiment.
In addition, also need to prove, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or operating space, and not necessarily requires or hint and have the relation of any this reality or sequentially between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
As indicated above according to embodiment of the present utility model, these embodiment do not have all details of detailed descriptionthe, do not limit this utility model yet and only are described specific embodiment.Obviously, according to above description, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain better principle of the present utility model and practical application, thereby the technical field technical staff can utilize the utility model and the modification on the utility model basis to use well under making.The utility model only is subjected to the restriction of claims and four corner and equivalent.
Claims (7)
1. a digital power control circuit is applied to it is characterized in that in the digital power, comprising:
Analog to digital converter in order to receiving the output voltage of described digital power, and compares with n fiducial value, and comparative result is converted to the current output voltage that characterizes described digital power and the digital error signal of the error between the desired output voltage, n 〉=3;
Digital compensation circuit receives described digital error signal, with the digital duty cycle signals of corresponding generation; The dynamic component of wherein said digital duty cycle signals is passed to described analog to digital converter, with the numerical value of the described one group of fiducial value of corresponding change;
The DPWM module, according to the described digital duty cycle signals that receives, produce pwm control signal and control the switch motion of the power switch in the described digital power, the output voltage that guarantees described digital power is consistent with desired output voltage, and, when the output voltage of described digital power and desired output voltage are inconsistent, guarantee that the output voltage of described digital power returns to described desired output voltage fast.
2. digital power control circuit according to claim 1 is characterized in that, n is odd number, and the numerical value of a described n fiducial value is distributed in the both sides of the desired output voltage of described digital power centered by the desired output voltage of described digital power.
3. digital power control circuit according to claim 2, it is characterized in that, described analog to digital converter comprises n comparator, and the first input end of a described n comparator receives the output voltage of described digital power, and the second input receives respectively a described n fiducial value.
4. digital power control circuit according to claim 3 is characterized in that, described analog to digital converter comprises digital decoder, in order to receiving the output signal of a described n comparator, and described output signal is converted to described digital error signal.
5. digital power control circuit according to claim 2 is characterized in that, described analog to digital converter comprises and described n fiducial value n digital to analog converter one to one.
6. digital power control circuit according to claim 5 is characterized in that, described analog to digital converter also comprises n counter and (n-1)/2 register; Wherein, described (n-1)/2 reference value is stored in respectively in the register of described (n-1)/2; A described n counter and a described n digital to analog converter connect one to one.
7. a digital power is characterized in that, comprises the described arbitrary digital power control circuit of claim 1-6, also comprises power stage circuit; The pwm control signal of described digital power control circuit output is controlled the switch motion of the power switch in the described digital power, the output voltage that guarantees described digital power is consistent with desired output voltage, and, when the output voltage of described digital power and desired output voltage are inconsistent, guarantee that the output voltage of described digital power returns to described desired output voltage fast.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220220956 CN202663301U (en) | 2012-05-16 | 2012-05-16 | Digital power supply control circuit and digital power supply applying same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220220956 CN202663301U (en) | 2012-05-16 | 2012-05-16 | Digital power supply control circuit and digital power supply applying same |
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| CN202663301U true CN202663301U (en) | 2013-01-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684495A (en) * | 2012-05-16 | 2012-09-19 | 杭州乐图光电科技有限公司 | Digital power supply control circuit, control method and digital power supply using circuit and method |
-
2012
- 2012-05-16 CN CN 201220220956 patent/CN202663301U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684495A (en) * | 2012-05-16 | 2012-09-19 | 杭州乐图光电科技有限公司 | Digital power supply control circuit, control method and digital power supply using circuit and method |
| CN102684495B (en) * | 2012-05-16 | 2015-02-18 | 杭州乐图光电科技有限公司 | Digital power supply control circuit, control method and digital power supply using circuit and method |
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Address after: 10, 310023 floor, B zone, HOLLEY Science Park, No. 181, Wuchang Road, Yuhang District, Zhejiang, Hangzhou Patentee after: Hangzhou Letu Photoelectric Technology Co., Ltd. Address before: 10, 310023 floor, B zone, HOLLEY Science Park, No. 181, Wuchang Road, Zhejiang, Hangzhou Patentee before: Hangzhou Letu Photoelectric Technology Co., Ltd. |
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Granted publication date: 20130109 Termination date: 20150516 |
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