CN103762831B - PWM voltage priority control circuit - Google Patents
PWM voltage priority control circuit Download PDFInfo
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- CN103762831B CN103762831B CN201410058425.8A CN201410058425A CN103762831B CN 103762831 B CN103762831 B CN 103762831B CN 201410058425 A CN201410058425 A CN 201410058425A CN 103762831 B CN103762831 B CN 103762831B
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Abstract
The invention relates to a PWM voltage priority control circuit. The PWM voltage priority control circuit comprises a main circuit and a switch tube control circuit connected to each other. The switch tube control circuit comprises a comparator A, a comparator B, a NAND gate s and a driver, wherein a current input end of a filtering inductor L1 is connected with a same-phase input end of the comparator A, the other input end of the comparator A is grounded through reference current, a current output end of the filtering inductor L1 is connected with a same-phase input end of the comparator B, the other input end of the comparator B is grounded through reference voltage, the input end of the NAND gate s is respectively connected with the output ends of the comparator A and the comparator B, and the output end of the NAND gate s is connected with a switch tube MOS1 through the driver. Compared with the prior art, the PWM voltage priority control circuit has the advantages of being high in voltage control accuracy, simple in circuit topology and fast in transient state response.
Description
Technical field
The present invention relates to pwm voltage control technology, especially relate to a kind of pwm voltage first level control circuit.
Background technology
With developing rapidly of quasiconductor and information technology, the DC-to-dc chopper as power-supply management system is opened
Close power supply and must be fulfilled for following technical need: (1) output voltage is low；(2) output voltage high precision；(3) output current is big；(4)
When input power and output loading transition, the transient overshoot of output voltage is little.Above demand is to the stable state of Switching Power Supply and dynamic
Characteristic proposes higher requirement, proposes new challenge to the control method of Switching Power Supply.Wherein, traditional pwm voltage control
Method processed meets the basic demand of stability and control accuracy due to it, and is widely used in Switching Power Supply, traditional pwm
Voltage control circuit principle is as shown in Figure 1.But, this control method when input voltage and load are undergone mutation, due to control
The time delay that in circuit processed, the compensation circuit of voltage error amplifier is brought is delayed, not only causes its transient response slowly, reduces
Its dynamic characteristic.Traditional pwm voltage control method specifically has the disadvantage in that
1. in traditional pwm voltage control method it is necessary to using operational amplifier and triangular carrier produce circuit and its
Its compensation circuit, the manufacturing cost that these easily cause Switching Power Supply rises it is difficult to realize miniaturization and lightweight.Voltage error is put
The compensation circuit of big device is complex in design and debugging.
2. the error characteristics of operational amplifier will have a strong impact on the performance of control circuit.So designer is put in solution computing
It is necessary to take a substantial amount of time and manpower and materials during the stable problem of big device.
3. generally pertain only in traditional pwm voltage control method carry out when output changes and causes load voltage change
Control, the disturbance causing when input quantity not being changed achieves effective control.Then, when input quantity changes, control circuit is being rung
To be greatly affected between seasonable and in precision.
4. in traditional pwm voltage control method, adjustment phase place compensation circuit is gain and the frequency range by error amplifier
Improve load change characteristic, but this method needs consummate Power Management Design technology, is not easy to accomplish.
5., in the case of light load, in traditional pwm voltage control method, circuit must dcm (discontinuous current be entered
Pattern) state so that output voltage can not maintain, discontinuous current mode, so that the transformation range of load is severely limited, thus
Lead to circuit cisco unity malfunction.
Problems above brings a lot of difficulties to designer, and extends the design cycle, consumes a large amount of manpower things
Power, traditional pwm voltage control method is difficult to meet input and output High-speed transient response, load excursion width, miniaturization, light
Quantization, inexpensive, efficient technical specification.
Content of the invention
The purpose of the present invention is exactly to overcome the defect of above-mentioned prior art presence to provide a kind of voltage control accuracy
High, circuit topology is simple, the pwm voltage first level control circuit of High-speed transient response.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of pwm voltage first level control circuit, including the main circuit being connected and switch controlled circuit, described master
Circuit includes input voltage vi, switching tube mos1, filter inductance l1, filter capacitor co and the resistance rc being sequentially connected, described
Resistance rc is grounded after being connected with input voltage vi, and described switch controlled circuit includes comparator a, comparator b, NAND gate s
And driver, the described current input terminal of filter inductance l1 is connected with the in-phase input end of comparator a, and comparator a's is another
Input is connected with the in-phase input end of comparator b by reference to current earthing, the described current output terminal of filter inductance l1,
Another input of comparator b connects comparator a's and b respectively by reference to voltage ground, the input of described NAND gate s
Outfan, the outfan of NAND gate s is connected with switching tube mos1 by driver；
Comparator a compares the inductive current and reference current at the current input terminal of l1, compares knot to the output of NAND gate s
Really, comparator b compares the output voltage at the current output terminal of l1 and reference voltage, exports comparative result to NAND gate s, and non-
, according to the comparative result of comparator a and b to driver output control signal, driver is according to control signal controlling switch pipe for door s
Mos1 is switched on or off.
Described NAND gate s according to as follows directly value table to driver output control signal:
Wherein, 1 is high level, and 0 is low level.
Described main circuit also includes diode d1 and load ro, described diode d1 anode connecting valve pipe mos1,
Minus earth, described load ro one end connects filter inductance l1, and the other end is grounded.
Compared with prior art, the method have the advantages that
1) without operational amplifier and triangular carrier circuit it is achieved that the precise control of output voltage；
2) NAND gate, two comparators are only needed to, control circuit device greatly reduces, control circuit topology is simple；
3) not using error amplifier, feedback phase is not had to postpone, completely without phase compensating circuit.Meanwhile, control
The stability of circuit processed is greatly improved；
4) load change and during input voltage variation output voltage be all controlled to Min. so that can fast quick-recovery
Former output voltage level, output voltage overshoot and regulating time are all minimum, and then have good regulation and High-speed transient sound
Answer characteristic；
5) compared with traditional pwm voltage control method, meet the high speed in input voltage and output loading change
Transient response, small-sized, inexpensive, efficient requirement.
Brief description
Fig. 1 is the schematic diagram of traditional pwm voltage control circuit；
Fig. 2 is the schematic diagram of two priority classes circuit of the present invention；
Fig. 3 is the circuit theory diagrams being introduced into current comparing module during traditional pwm voltage controls；
In Fig. 1～Fig. 3, vi: input voltage；Mos1: switching tube；D1: diode；L1: filter inductance；Co: filter capacitor；
Rc1, rc2, rc3, ra, rb, rc: resistance；Vrc, vref: reference voltage；Vsaw: carrier voltage；Imin: reference current；Ro: negative
Carry；Vo: output voltage；
Fig. 4 is the transient response curve of two priority classes output voltage of the present invention；
In figure, vo: priority introduces the output voltage after traditional voltage controls；Il: priority introduces traditional voltage
Inductive current after control；
Fig. 5 is load current ioThe change static curve of output voltage vo during change；
Fig. 6 is load current ioTraditional during jump fall one times of (rising to) control and transient response curve comparison diagram of the present invention；
In figure, vo1: traditional voltage controls output voltage；Vo2: two priority classes output voltage；Io1: traditional voltage
Control output current；Io2: two priority classes output current；
Fig. 7 rises to traditional when one times of (jump fall) control and transient response curve comparison diagram of the present invention for input voltage vin；
In figure, vo1: traditional voltage controls output voltage；Vo2: two priority classes output voltage；Vin1: traditional electricity
Voltage-controlled input voltage processed；Vin2: two priority classes input voltage；
Fig. 8 is 3v for output voltage, and load resistance is all traditional during 10 ω control and transient response curve of the present invention
Comparison diagram；
In figure, vo1: traditional voltage controls output voltage；Vo2: two priority classes output voltage；Il1: traditional voltage
Control inductive current；Il2: two priority classes inductive current.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention be not limited to
Following embodiments.
As shown in Fig. 2 a kind of pwm voltage first level control circuit, including the main circuit being connected and switch controlled electricity
Road, described main circuit includes input voltage vi, switching tube mos1, filter inductance l1, filter capacitor co and the electricity being sequentially connected
Resistance rc, described resistance rc is connected with input voltage vi after ground connection, main circuit also includes diode d1 and loads ro, described two
Level pipe d1 anode connecting valve pipe mos1, minus earth, described load ro one end connects filter inductance l1, and the other end is grounded.
Described switch controlled circuit includes comparator a, comparator b, NAND gate s and driver, described filtered electrical
The current input terminal of sense l1 is connected with the in-phase input end of comparator a, and another input of comparator a is connect by reference to electric current
Ground, the described current output terminal of filter inductance l1 is connected with the in-phase input end of comparator b, another input of comparator b
By reference to voltage ground, the input of described NAND gate s connects the outfan of comparator a and b respectively, NAND gate s defeated
Go out end to be connected with switching tube mos1 by driver；Comparator a compares inductive current and reference electricity at the current input terminal of l1
Stream, exports comparative result to NAND gate s, comparator b compares the output voltage and reference voltage at the current output terminal of l1, to
Not gate s exports comparative result, and NAND gate s is according to the comparative result of comparator a and b to driver output control signal, driver
According to being switched on or off of control signal controlling switch pipe mos1.Based on conservation of energy principle, by the automatic tune of switching frequency
Section, makes the electric current of l1 remain continuous, so that the energy that l1 absorbs is consistent with the energy of input.Load when light
When, also the electric current of l1 can be made continuous by current feedback so that main circuit occurs without the state (dcm) of discontinuous current.
Two priority classes circuit of the present invention passes through current feedback and Voltage Feedback and realizes opening and turning off control of switch.Its
Controlled state is as follows:
If comparator a is output as a, comparator b is output as b, and NAND gate is output as s.High level is 1, low level
For 0.
(1)il1≤iminA=0
I.e. during this kind of state, the conducting of switch and output voltage voSize unrelated, switching tube is open-minded, and power supply fills to inductance
Electricity, inductive current il1Rise, iminCurrent value for reference current.
(2)il1>iminA=1
①vo<vrefB=0,I.e. switching tube is open-minded, and power supply is to induction charging, output voltage voRise, vrefFor
The magnitude of voltage of reference voltage.
②vo≥vrefB=1,I.e. switching tube turns off, and inductance passes through fly-wheel diode afterflow, output voltage voUnder
Fall.
Therefore the input of NAND gate and the truth table of output are as shown in table 1.
Table 1
The two priority classes of the present invention have fast transient response characteristic when input and output amount changes.By Voltage Feedback
Follow the tracks of rapidly the change of input and output through gate, realize stablizing of output voltage.When light load, strong by current feedback
System makes circuit operate in ccm (continuous current mode) state, maintains the high efficiency of transmission of power.Because this control circuit only needs one
NAND gate and two comparators, the number of devices of control circuit greatly reduces, and cost and volume have all obtained larger improvement.And
And, due to using error amplifier, while eliminating the Phase delay problem that compensation circuit is brought, not effectively increasing
The dynamic characteristic of control circuit.
Additionally, utilizing this concept of priority, current comparing module can be introduced traditional control so that loading light
When, force to make filter inductance electric current be not zero and negative value is it is ensured that inductive current is in ccm pattern.For example, current comparing module
Introduce traditional voltage to control, as shown in Figure 3.
Apply circuit of the present invention and traditional control circuit to carry out emulation experiment, experimental result as shown in Fig. 4～Fig. 8,
On the basis of theory analysis and simulation comparison, demonstrate this control circuit in load change and input voltage variation, have
Good stable state and dynamic characteristic.
Claims (3)
1. a kind of pwm voltage first level control circuit, including the main circuit being connected and switch controlled circuit, described main electricity
Road includes input voltage vi, switching tube mos1, filter inductance l1, filter capacitor co and the resistance rc being sequentially connected, described electricity
Resistance rc is grounded it is characterised in that described switch controlled circuit includes comparator a, comparator after being connected with input voltage vi
B, NAND gate s and driver, the described current input terminal of filter inductance l1 is connected with the in-phase input end of comparator a, compares
, by reference to current earthing, the described current output terminal of filter inductance l1 is defeated with the homophase of comparator b for another input of device a
Enter end to connect, by reference to voltage ground, the input of described NAND gate s connects ratio to another input of comparator b respectively
Compared with the outfan of device a and b, the outfan of NAND gate s is connected with switching tube mos1 by driver；
Comparator a compares the inductive current and reference current at the current input terminal of l1, exports comparative result to NAND gate s, than
Compare output voltage and the reference voltage at the current output terminal of l1 compared with device b, export comparative result, NAND gate s root to NAND gate s
According to comparator a and b comparative result to driver output control signal, driver is according to control signal controlling switch pipe mos1's
It is switched on or off, based on conservation of energy principle, automatically adjusting by switching frequency, make the electric current of l1 remain continuous, from
And the energy that l1 absorbs is consistent with the energy of input, when light load, the electric current making l1 by current feedback is even
Continuous.
2. a kind of pwm voltage first level control circuit according to claim 1 is it is characterised in that described NAND gate s root
According to following truth table to driver output control signal:
Wherein, 1 is high level, and 0 is low level.
3. a kind of pwm voltage first level control circuit according to claim 1 it is characterised in that described main circuit also
Including diode d1 and load ro, described diode d1 negative electrode connecting valve pipe mos1, plus earth, described load ro mono-
End connects filter inductance l1, and the other end is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410058425.8A CN103762831B (en) | 2014-02-20 | 2014-02-20 | PWM voltage priority control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410058425.8A CN103762831B (en) | 2014-02-20 | 2014-02-20 | PWM voltage priority control circuit |
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| Publication Number | Publication Date |
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| CN103762831A CN103762831A (en) | 2014-04-30 |
| CN103762831B true CN103762831B (en) | 2017-01-25 |
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| CN201410058425.8A Expired - Fee Related CN103762831B (en) | 2014-02-20 | 2014-02-20 | PWM voltage priority control circuit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104124870B (en) * | 2014-08-08 | 2017-09-05 | 华为技术有限公司 | Switching Power Supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201466973U (en) * | 2009-02-25 | 2010-05-12 | 西南交通大学 | Double-frequency control device of switch power supply of quasi-continuous operation mode |
| CN101867177A (en) * | 2010-07-02 | 2010-10-20 | 深圳市四方电气技术有限公司 | Over-voltage and over-current hardware protection circuit and DC power supply circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2800640Y (en) * | 2004-12-01 | 2006-07-26 | 崇贸科技股份有限公司 | Switching control device |
| US7733671B2 (en) * | 2006-06-23 | 2010-06-08 | Mediatek Inc. | Switching regulators |
| CN102832814B (en) * | 2012-09-10 | 2014-11-26 | 上海电力学院 | Method for controlling hysteresis with voltage feedforward quickly |
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2014
- 2014-02-20 CN CN201410058425.8A patent/CN103762831B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201466973U (en) * | 2009-02-25 | 2010-05-12 | 西南交通大学 | Double-frequency control device of switch power supply of quasi-continuous operation mode |
| CN101867177A (en) * | 2010-07-02 | 2010-10-20 | 深圳市四方电气技术有限公司 | Over-voltage and over-current hardware protection circuit and DC power supply circuit |
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