CN208174535U - A kind of small ripple hop cycle control circuit - Google Patents
A kind of small ripple hop cycle control circuit Download PDFInfo
- Publication number
- CN208174535U CN208174535U CN201820741065.5U CN201820741065U CN208174535U CN 208174535 U CN208174535 U CN 208174535U CN 201820741065 U CN201820741065 U CN 201820741065U CN 208174535 U CN208174535 U CN 208174535U
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- China
- Prior art keywords
- hop cycle
- cut
- out switch
- hop
- detection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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- 238000001514 detection method Methods 0.000 claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 125000004122 cyclic group Chemical class 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- Dc-Dc Converters (AREA)
Abstract
The utility model provides a kind of small ripple hop cycle control circuit, increase the cut-out switch of hop cycle detection circuit and error amplifier output compensation loop, the control signal output of the hop cycle detection circuit is connected with the switch actuating signals control terminal of the cut-out switch；When hop cycle detection circuit detects that circuit enters hop cycle operating mode, control cut-out switch is disconnected, and cuts off error amplifier output compensation loop；When hop cycle detection circuit detects that circuit exits hop cycle operating mode, control cut-out switch closure, error amplifier output compensation loop access.Compared with prior art, under hop cycle operating mode, continuous work number of cycles and continuous idle number of cycles are reduced, so that duty cycle and null cycle more uniformly spread, achievees the purpose that reduce output voltage ripple and input current ripple.
Description
Technical field
The utility model relates to electronic circuit fields, more particularly to a kind of small ripple hop cycle control circuit.
Background technique
When DC-DC converter work is in small duty ratio, since circuit is there are minimum duty cycle limitation, converter can enter
Hop cycle operating mode, this mode can reduce the working frequency of entire converter, improve transfer efficiency, but will lead to output ripple
Increase.The main reason for causing this phenomenon is since the compensation network of system loop will lead to phase delay, as shown in Figure 1, meeting
There are continuous multiple minimum duty cycle duty cycles, then continuous multiple periods do not work, and in this cyclic process, averagely account for
Sky is than being less than set minimum duty cycle, and output voltage ripple is larger, while the ripple of input current is also larger, this point is boosting
Converter performance is particularly evident.
Utility model content
The small ripple that the utility model provides a kind of purpose that can reduce output voltage ripple and input current ripple is jumped
Cycle control methods and control circuit have under hop cycle operating mode, reduce continuous work number of cycles and continuous not work
The number of cycles of work, so that the characteristics of duty cycle and null cycle more uniformly spread.
According to a kind of small ripple hop cycle control circuit provided by the utility model, increase hop cycle detection circuit and error
The control signal output of the cut-out switch of amplifier out compensation loop, the hop cycle detection circuit is cut off with described
The switch actuating signals control terminal of pass is connected；When hop cycle detection circuit detects that circuit enters hop cycle operating mode, control
Cut-out switch processed disconnects, and cuts off error amplifier output compensation loop；When hop cycle detection circuit detects that circuit exits jump
When cycle operating mode, control cut-out switch closure, error amplifier output compensation loop access.
The hop cycle detection circuit is d type flip flop hop cycle detection circuit, the input of D triggering end and company of error amplifier institute
The signal of the PWM output connect, Q output connect cut-out switch control terminal.
The cut-out switch is set to error amplifier output and compensation loop resistance RCBetween.
The cut-out switch is set to compensation loop resistance RCWith capacitor CCBetween.
The cut-out switch is set to compensation loop capacitor CCWith connect between ground.
Compared with prior art, under hop cycle operating mode, continuous work number of cycles and continuous idle is reduced
Number of cycles, so that duty cycle and null cycle more uniformly spread, reaching reduces output voltage ripple and input current
The purpose of ripple.
Detailed description of the invention
Fig. 1 is the main node waveform diagram of traditional hop cycle work.
Fig. 2 is the small ripple hop cycle control circuit attachment structure schematic diagram of the utility model wherein embodiment.
Fig. 3 is using the main node waveform obtained after the small ripple hop cycle control circuit of an embodiment of the present invention
Schematic diagram.
Fig. 4 is the hop cycle detection circuit attachment structure schematic diagram that an embodiment of the present invention uses.
Fig. 5 is the hop cycle detection waveform schematic diagram of embodiment illustrated in fig. 4.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.
This specification（Including any abstract and attached drawing）Disclosed in any feature unless specifically stated can be by other
Equivalent or with similar purpose alternative features are replaced.That is, unless specifically stated, each feature is a series of equivalent
An or example in similar characteristics.
As shown in Fig. 2, a kind of small ripple hop cycle control circuit, increases hop cycle detection circuit PSM and error amplifier
The cut-out switch S of reference-junction compensation loop1, control signal output and the cut-out switch of the hop cycle detection circuit
Switch actuating signals control terminal is connected；When hop cycle detection circuit detects that circuit enters hop cycle operating mode, control is cut
It disconnects shutdown to open, cuts off error amplifier output compensation loop；When hop cycle detection circuit detects that circuit exits hop cycle
When operating mode, control cut-out switch closure, error amplifier output compensation loop access.
When circuit work is under skip cycle mode, due to increasing hop cycle state detection module in circuit.When circuit works
In hop cycle, main power gate control signal VG1It is discontinuous to will appear jump, passes through hop cycle detection circuit, output signal VCControl
Switch S1It disconnects, the voltage of the output end COMP of GM is stored in compensating electric capacity CCOn, GM is used as comparator, is examined in real time
Survey output voltage VO, work as VOWhen voltage is lower than preset value, COMP is overturn at once, VG1It is again turned on, works into minimum duty cycle
Mode, inductance L1To output capacitance COCharging, and error amplifier GM output end COMP voltage is restored to the last time and has just enter into cycle-skipping
The voltage when phase；When having just enter into charge mode, due to VOSlightly below preset value, therefore COMP voltage can slightly rise, inductance L1
Electric current is gradually increased, by minimum duty cycle time, L1Storage energy is output to output capacitance CO, so that output voltage rises.By
In VOVoltage just charges again just below setting value, inductance, therefore can use seldom trickle charge period, allows for output electricity
Press VODecline again higher than setting value COMP, into skip cycle mode.So circulation can be reduced trickle charge and not work continuously
Time so that output voltage ripple and input current ripple reduce.
The hop cycle detection circuit is d type flip flop hop cycle detection circuit, the input of D triggering end and company of error amplifier institute
The signal of the PWM output connect, Q output connect cut-out switch control terminal.
As shown in figure 4, one embodiment mode as the utility model, hop cycle detection circuit is using a D triggering
Device circuit, the output signal PWM1 of D triggering termination pwm circuit, Q output output control signal VC.As shown in figure 5, when CLK goes out
When existing rising edge, PWM1 signal is latched, and this signal is sent to VC, user's control switch S1, work as VCWhen for high level, S1Closure；
Work as VCWhen for low level, indicate to be in skip cycle mode, control switch S1It disconnects, accelerates the response time of system.
As a kind of embodiment of the utility model, the cut-out switch can be set in error amplifier output with
Compensation loop resistance RCBetween, or it is set to compensation loop resistance RCWith capacitor CCBetween, or it is set to compensation loop capacitor CCWith
It connects between ground.
Claims (5)
1. a kind of small ripple hop cycle control circuit, it is characterised in that：Increase hop cycle detection circuit and error amplifier output
The cut-out switch of end compensating loop, the control signal output of the hop cycle detection circuit and the switch of the cut-out switch are dynamic
Make signal control terminal to be connected；When hop cycle detection circuit detects that circuit enters hop cycle operating mode, cut-out switch is controlled
It disconnects, cuts off error amplifier output compensation loop；When hop cycle detection circuit detects that circuit exits hop cycle Working mould
When formula, control cut-out switch closure, error amplifier output compensation loop access.
2. small ripple hop cycle control circuit according to claim 1, it is characterised in that：The hop cycle detection circuit is
D type flip flop hop cycle detection circuit, the signal for the PWM output that the input of D triggering end is connect with error amplifier, Q output connect
Connect cut-out switch control terminal.
3. small ripple hop cycle control circuit according to claim 1 or 2, it is characterised in that：The cut-out switch setting
In error amplifier output and compensation loop resistance RCBetween.
4. small ripple hop cycle control circuit according to claim 1 or 2, it is characterised in that：The cut-out switch setting
In compensation loop resistance RCWith capacitor CCBetween.
5. small ripple hop cycle control circuit according to claim 1 or 2, it is characterised in that：The cut-out switch setting
In compensation loop capacitor CCWith connect between ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820741065.5U CN208174535U (en) | 2018-05-18 | 2018-05-18 | A kind of small ripple hop cycle control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820741065.5U CN208174535U (en) | 2018-05-18 | 2018-05-18 | A kind of small ripple hop cycle control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208174535U true CN208174535U (en) | 2018-11-30 |
Family
ID=64364148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820741065.5U Withdrawn - After Issue CN208174535U (en) | 2018-05-18 | 2018-05-18 | A kind of small ripple hop cycle control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208174535U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429440A (en) * | 2018-05-18 | 2018-08-21 | 清华四川能源互联网研究院 | A kind of ripplet hop cycle control method and control circuit |
-
2018
- 2018-05-18 CN CN201820741065.5U patent/CN208174535U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429440A (en) * | 2018-05-18 | 2018-08-21 | 清华四川能源互联网研究院 | A kind of ripplet hop cycle control method and control circuit |
| CN108429440B (en) * | 2018-05-18 | 2024-03-29 | 清华四川能源互联网研究院 | Small ripple skip period control method and control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20181130 Effective date of abandoning: 20240329 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20181130 Effective date of abandoning: 20240329 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |