CN107947579B - Control circuit, control method and switching circuit of switching power supply - Google Patents
Control circuit, control method and switching circuit of switching power supply Download PDFInfo
- Publication number
- CN107947579B CN107947579B CN201711340056.1A CN201711340056A CN107947579B CN 107947579 B CN107947579 B CN 107947579B CN 201711340056 A CN201711340056 A CN 201711340056A CN 107947579 B CN107947579 B CN 107947579B
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- turn
- changed
- tube
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 54
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000001052 transient effect Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control circuit, a control method and a switching circuit of a switching power supply.A regulating circuit receives a compensation signal and a turn-off proportion signal, outputs a first signal, the turn-off proportion signal is a turn-off time signal multiplied by the first proportion, and a first comparing circuit receives a rectifying tube current sampling signal and the first signal and outputs a main tube first conduction signal to a logic control circuit; the logic control circuit generates a switching signal according to the main pipe first on signal and the turn-off time signal, when the main pipe first on signal is effective and the turn-off time signal is effective, the switching signal is changed from ineffective to effective, and the driving circuit controls the main switching pipe in the switching power circuit to be turned on and the rectifying pipe to be turned off. The switching frequency of the system is not influenced by the current sampling proportion deviation of the main pipe and the rectifying pipe, and the transient response of the system is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a control circuit, a control method and a switching circuit of a switching power supply.
Background
Referring to fig. 1, in the switching power supply, when the switching circuit responds in a transient state, such as a load jump, the command current VC suddenly decreases, if the inductor current i L is greater than the command current VC during a constant off time TOFF, the off time of the switching tube is allowed to be prolonged, and the main switching tube is not allowed to be turned on until the inductor current i L reaches the command current VC or is less than the command current VC by a certain threshold value. Because of the characteristics of a switching tube (such as a PMOS tube or an NMOS tube) device in the switching circuit and the influence of external conditions, the sampling precision of the inductance current is inaccurate, so that the inductance current i L does not actually follow the command current VC. Referring to fig. 2, is1 is a main tube sampling current, is2 is a rectifying tube sampling current, the main tube current sampling proportion is smaller than the rectifying tube sampling proportion, and in transient state, a longer time is required for the rectifying tube sampling current to reach the command current, so that the turn-off time of the main power tube is longer. Therefore, the current sampling ratio of the main pipe and the rectifying pipe is deviated, so that the switching frequency is deviated, and the transient response of the system is affected.
Disclosure of Invention
Therefore, the invention aims to provide a control circuit, a control method and a switching circuit of a switching power supply, which are used for solving the problem that the transient response of a system is affected due to the fact that the switching frequency is deviated due to the deviation of the current sampling proportion of a main pipe and a rectifying tube in the prior art.
The technical solution of the invention is to provide a control circuit of a switching power supply, wherein the switching power supply comprises a driving circuit and a switching power circuit, and the control circuit comprises
The regulating circuit, the rectifying tube current sampling circuit, the first comparison circuit and the logic control circuit,
The regulating circuit receives the compensation signal and the turn-off proportion signal, outputs a first signal, the turn-off proportion signal is a turn-off time signal multiplied by a first proportion,
The rectifying tube current sampling circuit outputs a rectifying tube current sampling signal,
The first comparison circuit receives the rectifying tube current sampling signal and the first signal and outputs a main tube first conduction signal to the logic control circuit, and when the rectifying tube current sampling signal is smaller than the first signal, the main tube first conduction signal is changed from invalid to valid;
The logic control circuit generates a switching signal according to the main pipe first on signal and the off time signal,
When the first on signal of the main pipe is effective and the off time signal is effective, the switch signal is changed from ineffective to effective, and the main switch tube in the switch power circuit is controlled to be on through the driving circuit, and the rectifying tube is turned off.
Optionally, the circuit also comprises a main switch tube current sampling circuit and a second comparison circuit,
The second comparison circuit receives the main switching tube current sampling signal and the compensation signal and outputs a main tube turn-off signal to the logic control circuit, and when the main switching tube current sampling signal is larger than the compensation signal, the main tube turn-off signal is changed from invalid to valid;
When the main pipe turn-off signal is changed from invalid to valid, the switch signal is changed from valid to invalid, and the drive circuit controls the main switch tube in the switch power circuit to turn off and the rectifying tube to turn on.
Optionally, the regulating circuit comprises a regulator and a subtractor,
The regulator receives the off-proportion signal and the main pipe first on signal, the regulator makes the moment when the main pipe first on signal is changed from inactive to active and the moment when the off-proportion signal is changed from active to inactive close by regulating the output signals thereof,
The subtracter receives the output signal of the regulator and the compensation signal, wherein the output signal of the subtracter is the difference between the compensation signal and the output signal of the regulator, and the output signal of the subtracter is the output signal of the regulating circuit.
As an alternative, the regulator includes an edge comparison circuit that compares a time when the main pipe first on signal is changed from inactive to active and a time when the off ratio signal is changed from active to inactive, a current source that controls the current source to charge the capacitor when the time when the main pipe first on signal is changed from inactive to active is earlier than the time when the off ratio signal is changed from active to inactive; and when the moment that the first on signal of the main pipe is changed from invalid to valid is later than the moment that the off proportion signal is changed from valid to invalid, the edge comparison circuit controls the current source to discharge the capacitor, and the capacitor voltage is the output voltage of the regulator.
Optionally, the circuit further comprises an operational amplifier, wherein the operational amplifier receives a reference signal and a feedback signal of the switching power circuit, and operational amplification is performed on the reference signal and the feedback signal to obtain the compensation signal, and the feedback signal is a feedback voltage or a feedback current or a feedback power of the switching power circuit.
Another technical solution of the present invention is to provide a switching circuit control method, which receives a compensation signal and a turn-off ratio signal, outputs a first signal, the turn-off ratio signal is a turn-off time signal multiplied by a first ratio,
Comparing the rectifying tube current sampling signal with the first signal, and changing the first conduction signal of the main tube from invalid to valid when the rectifying tube current sampling signal is smaller than the first signal;
when the main pipe first on signal is valid and the off time signal is valid, the switch signal is changed from invalid to valid, a main switch pipe in the switch power circuit is turned on, and the rectifying pipe is turned off.
Optionally, comparing the main switching tube current sampling signal with the compensation signal, and when the main switching tube current sampling signal is larger than the compensation signal, changing the main tube turn-off signal from invalid to valid; when the main pipe turn-off signal is changed from invalid to valid, the switch signal is changed from valid to invalid, and a main switch tube in the switch power circuit is turned off and a rectifying tube is turned on.
Alternatively, the second signal is adjusted so that the timing at which the main pipe first on signal is changed from inactive to active and the timing at which the off-ratio signal is changed from active to inactive are close, and the compensation signal and the second signal are differenced to be the first signal.
A further technical solution of the present invention is to provide a switching circuit.
Compared with the prior art, the circuit structure and the method have the following advantages: the switching frequency of the system is not influenced by the current sampling proportion deviation of the main pipe and the rectifying tube, and the transient response of the system is improved.
Drawings
Fig. 1 is a waveform diagram of an inductor current i L, a command current VC, a constant off time TOFF, and a main pipe on signal TON during transient state in the prior art;
Fig. 2 is a waveform diagram of a main tube sampling current is1, a rectifier tube sampling current is2, an instruction current VC, a constant off time TOFF, and a main tube on signal TON during transient state in the prior art;
FIG. 3 is a schematic diagram of an embodiment of a control circuit according to the present invention;
FIG. 4 is a schematic diagram of an embodiment of a conditioning circuit according to the present invention;
FIG. 5 is a waveform diagram of the command signal VC, the first signal VC ', the off-time signal TOFF, the off-scale signal TOFF' and the main first on signal IBOT according to the present invention;
FIG. 6 is an embodiment of a regulator of the present invention;
FIG. 7 is a schematic diagram of an embodiment of a control circuit when the switching circuit of the present invention is a BUCK step-down circuit;
FIG. 8 is a schematic diagram of an embodiment of a logic control circuit according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments only. The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention.
In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details.
The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. It should be noted that the drawings are in a simplified form and are not to scale precisely, but rather are merely intended to facilitate and clearly illustrate the embodiments of the present invention.
The invention provides a control circuit 100 of a switching power supply, referring to fig. 3, the switching power supply comprises a driving circuit 200 and a switching power circuit 300, and comprises a regulating circuit 120, a rectifying tube current sampling circuit 160, a first comparing circuit 150 and a logic control circuit 170, wherein the regulating circuit 120 receives a compensation signal VC and a turn-off proportion signal TOFF ', outputs a first signal VC ', the turn-off proportion signal TOFF ' is a turn-off time signal TOFF multiplied by a first proportion, the first comparing circuit 150 receives a rectifying tube current sampling signal is2 and the first signal VC ', and outputs a main first on signal IBOT to the logic control circuit 170, and when the rectifying tube current sampling signal is2 is smaller than the first signal VC ', the main first on signal IBOT is changed from invalid to valid;
The logic control circuit 170 generates a switching signal TON according to the main first on signal IBOT and the off-time signal TOFF, when the main first on signal IBOT is active and the off-time signal TOFF is active, the switching signal TON is changed from inactive to active, and the driving circuit 200 controls the main switching tube in the switching power circuit 300 to be turned on and the rectifying tube to be turned off.
In the present invention, the active high level and the inactive low level are exemplified, and the active low level and the inactive high level may be exemplified.
The rectifying tube can be a synchronous rectifying tube or a freewheeling diode.
The first ratio is greater than or equal to 0 and less than or equal to 1.
Compared with the prior art, the circuit structure provided by the invention has the following advantages: the switching frequency of the system is not influenced by the current sampling proportion deviation of the main pipe and the rectifying tube, and the transient response of the system is improved.
The second comparator circuit 140 receives the main switching tube current sampling signal is1 and the compensation signal VC, and outputs a main tube turn-off signal ITOP to the logic control circuit 170, and when the main switching tube current sampling signal is1 is greater than the compensation signal VC, the main tube turn-off signal ITOP is changed from inactive to active; when the main pipe turn-off signal ITOP changes from inactive to inactive, the switching signal TON changes from active to inactive, and the driving circuit 200 controls the main switching tube of the switching power circuit 300 to turn off and the rectifying tube to turn on.
Referring to fig. 4, the adjusting circuit 120 includes an adjuster 121 and a subtractor 122,
The regulator 120 receives the off-ratio signal TOFF 'and the main first on signal IBOT, and the regulator adjusts the output signal thereof so that the time when the main first on signal changes from inactive to active and the time when the off-ratio signal TOFF' changes from active to inactive are close, referring to fig. 5, the command signal VC, the first signal VC ', the off-time signal TOFF, the off-ratio signal TOFF' and the waveform diagram of the main first on signal IBOT of the present invention, the falling edge of the off-ratio signal TOFF 'is close to the rising edge of the main first on signal IBOT, and the rectifier current sampling signal corresponding to the rising edge of the main first on signal IBOT characterizes the first signal VC'.
The subtractor 122 receives the output signal of the regulator 121 and the compensation signal VC, the output signal of the subtractor being the difference between the compensation signal and the output signal of the regulator, the output signal of the subtractor being the output signal of the regulating circuit.
The regulator 121 includes an edge comparison circuit 1211, a current source, and a capacitor C1211, the edge comparison circuit 1211 compares a time when the main pipe first on signal IBOT is changed from inactive to active and a time when the off-scale signal TOFF 'is changed from active to inactive, and when the time when the main pipe first on signal IBOT is changed from inactive to active is earlier than the time when the off-scale signal TOFF' is changed from active to inactive, the edge comparison circuit 1211 controls the current source to charge the capacitor C1211; when the timing at which the main pipe first on signal IBOT is turned on from inactive is later than the timing at which the off-scale signal TOFF' is turned off from active, the edge comparison circuit 1211 controls the current source to discharge the capacitor C1211, and the voltage of the capacitor C1211 is the output voltage of the regulator 121.
The regulator 121 further comprises current sources I1211, I1212, switches K1211, K1212. The edge comparison circuit 1211 has two outputs UP and DOWN. When the time when the main pipe first on signal IBOT is changed from inactive to active is earlier than the time when the off proportional signal TOFF' is changed from active to inactive, the UP control switch K1211 at the output end of the edge comparison circuit 1211 is turned on, the DOWN control switch K1212 is turned off, the current source I1211 charges the capacitor C1211, and the output voltage of the regulator is increased; when the first on signal IBOT is turned on from inactive to active, the output end UP of the edge comparison circuit 1211 controls the switch K1211 to be turned off, the DOWN control switch K1212 is turned on, the current source I1212 discharges the capacitor C1211, and the output voltage of the regulator decreases.
Referring to fig. 7, the circuit further includes an operational amplifier 110, where the operational amplifier 110 receives a reference signal VREF and a feedback signal FB of the switching power circuit 300, and performs operational amplification on the reference signal VREF and the feedback signal FB to obtain the compensation signal VC, and the feedback signal FB is a feedback voltage or a feedback current or a feedback power of the switching power circuit 300.
With continued reference to fig. 7, the switching power circuit 300 is taken as a BUCK circuit, and the feedback signal FB is taken as the feedback output voltage Vout. M31 is the main pipe, M32 is the synchronous rectifying tube, namely the rectifying tube. The common terminal of M31 and M32 is connected to the output terminal Vout through the inductance L30, and the output terminal is connected to the reference ground through the capacitance C30. The sampling resistors R30 and R31 are connected in series, the common end of the sampling resistors is a feedback signal, the feedback output voltage is fed back, the sampling resistors are connected to the negative input end of the operational amplifier 110, the positive input end of the operational amplifier 110 receives the reference signal VREF, and the output of the operational amplifier 110 is the compensation signal VC. The second comparing circuit 140 is a comparator, the positive input end of which receives the output voltage of the main switching tube current sampling circuit, and the negative input end of which receives the compensation signal VC. The first comparator circuit 150 is also a comparator, and its negative input terminal receives the output voltage of the rectifier tube current sampling circuit, and its negative input terminal receives the first signal VC'.
Referring to fig. 8, one embodiment of a logic control circuit 170 is shown. Taking the BUCK circuit of fig. 7 as an example, when TON is low, the rectifying tube M32 is turned on, TON is low, the output of the timing circuit 171 is low, the timing circuit 171 counts the on time of the rectifying tube M32, and when it counts to a constant off time, the output is high. The output of the timer circuit 171 and the master first on signal IBOT are inputs to the and circuit 172, and when both inputs to the and circuit 172 are high, then its output is high, otherwise its output is low. That is, the rectifier tube sampling current is smaller than the first signal VC' and the main tube turn-off time is longer than the constant turn-off time, the output signal ON of the and circuit 712 is high, otherwise the ON is low. The ON signal is connected to the S (SET) terminal of the RS flip-flop 173. The output signal of the RS flip-flop 173 is the switch signal TON, i.e., when the ON signal is high, the switch signal TON is high; the main pipe shutdown signal ITOP is connected to the R (RESET) terminal of the RS flip-flop 173, i.e., the switch signal TON is RESET to low when the main pipe shutdown signal ITOP is high.
Another technical solution of the present invention is to provide a switching circuit control method, which receives a compensation signal and a turn-off ratio signal TOFF ', outputs a first signal VC ', the turn-off ratio signal TOFF ' being a turn-off time signal TOFF multiplied by a first ratio,
Comparing the rectifying tube current sampling signal with the first signal VC ', and changing the main tube first conduction signal IBOT from invalid to valid when the rectifying tube current sampling signal is smaller than the first signal VC';
When the main first on signal IBOT is active and the off time signal TOFF is active, the switch signal TON is changed from inactive to active, and the main switch tube in the switch power circuit 300 is turned on, and the rectifying tube is turned off.
Comparing a main switching tube current sampling signal with the compensation signal VC, and changing the main tube turn-off signal ITOP from invalid to valid when the main switching tube current sampling signal is larger than the compensation signal VC; when the main pipe turn-off signal ITOP is changed from inactive to active, the switching signal TON is changed from inactive to active, and the main switching tube in the switching power circuit 300 is turned off, and the rectifying tube is turned on.
And adjusting a second signal so that the moment when the main pipe first on signal IBOT is changed from inactive to active and the moment when the off proportion signal TOFF 'is changed from active to inactive are close, and making a difference between the compensation signal VC and the second signal to obtain the first signal VC'.
A further technical solution of the present invention is to provide a switching circuit. The switch circuit comprises a BUCK step-down circuit, a BOOST step-up circuit, a BUCK-BOOST step-up circuit and the like. The switching power supply comprises the switching power supply control circuit.
In addition, although the embodiments are described and illustrated separately above, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and that reference may be made to another embodiment without explicitly recited in one of the embodiments.
The above-described embodiments do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments should be included in the scope of the present invention.
Claims (6)
1. A control circuit for a switching power supply, the switching power supply comprising a drive circuit and a switching power circuit, characterized in that: comprising
The regulating circuit, the rectifying tube current sampling circuit, the first comparison circuit and the logic control circuit,
The regulating circuit receives the compensation signal and the turn-off proportion signal, outputs a first signal, the turn-off proportion signal is a turn-off time signal multiplied by a first proportion,
The rectifying tube current sampling circuit outputs a rectifying tube current sampling signal,
The first comparison circuit receives the rectifying tube current sampling signal and the first signal and outputs a first conduction signal of the main switching tube to the logic control circuit, and when the rectifying tube current sampling signal is smaller than the first signal, the first conduction signal of the main switching tube is changed from invalid to valid;
The logic control circuit generates a switching signal according to the first on signal and the off time signal of the main switching tube,
When the first on signal of the main switching tube is effective and the off time signal is effective, the switching signal is changed from ineffective to effective, and the main switching tube in the switching power circuit is controlled to be on through the driving circuit, and the rectifying tube is turned off;
The circuit also comprises an operational amplifier, wherein the operational amplifier receives a reference signal and a feedback signal of the switching power circuit, and operational amplification is carried out on the reference signal and the feedback signal to obtain the compensation signal, and the feedback signal is feedback voltage or feedback current or feedback power of the switching power circuit;
The regulating circuit comprises a regulator and a subtracter, the regulator receives the turn-off proportion signal and the first conduction signal of the main switching tube, and the regulator adjusts the output signal of the regulator to enable the moment when the first conduction signal of the main switching tube changes from invalid to valid to be close to the moment when the turn-off proportion signal changes from valid to invalid; the subtracter receives the output signal of the regulator and the compensation signal, wherein the output signal of the subtracter is the difference between the compensation signal and the output signal of the regulator, and the output signal of the subtracter is the output signal of the regulating circuit.
2. The control circuit of a switching power supply according to claim 1, further comprising a main switching tube current sampling circuit and a second comparison circuit,
The second comparison circuit receives the main switching tube current sampling signal and the compensation signal and outputs a main switching tube turn-off signal to the logic control circuit, and when the main switching tube current sampling signal is larger than the compensation signal, the main switching tube turn-off signal is changed from invalid to valid;
When the turn-off signal of the main switching tube is changed from invalid to valid, the switch signal is changed from valid to invalid, and the main switching tube in the switching power circuit is controlled to be turned off through the driving circuit, and the rectifying tube is turned on.
3. The control circuit of a switching power supply according to claim 2, wherein the regulator includes an edge comparison circuit that compares a timing at which the main switching tube first on signal is changed from inactive to active and a timing at which the off proportion signal is changed from active to inactive, a current source that controls the current source to charge the capacitor when the timing at which the main switching tube first on signal is changed from inactive to active is earlier than the timing at which the off proportion signal is changed from active to inactive; and when the moment that the first on signal of the main switching tube is changed from invalid to valid is later than the moment that the off proportion signal is changed from valid to invalid, the edge comparison circuit controls the current source to discharge the capacitor, and the capacitor voltage is the output voltage of the regulator.
4. A control method of a switch circuit is characterized in that a compensation signal and a turn-off proportion signal are received, a first signal is output, the turn-off proportion signal is obtained by multiplying a turn-off time signal by a first proportion,
Comparing the rectifying tube current sampling signal with the first signal, and changing the first conduction signal of the main switch tube from invalid to valid when the rectifying tube current sampling signal is smaller than the first signal;
When the first on signal of the main switching tube is effective and the off time signal is effective, the switching signal is changed from ineffective to effective, the main switching tube in a switching power circuit included in the switching circuit is turned on, and the rectifying tube is turned off;
Receiving a reference signal and a feedback signal of a switching power circuit, and carrying out operational amplification on the reference signal and the feedback signal to obtain the compensation signal, wherein the feedback signal is feedback voltage or feedback current or feedback power of the switching power circuit;
and adjusting a second signal so that the moment when the first on signal of the main switch tube is changed from invalid to valid and the moment when the turn-off proportion signal is changed from valid to invalid are close, and making a difference between the compensation signal and the second signal to obtain the first signal.
5. The method for controlling a switching circuit according to claim 4, wherein,
Comparing the main switching tube current sampling signal with the compensation signal, and outputting a main switching tube turn-off signal, wherein the main switching tube turn-off signal is changed from invalid to valid when the main switching tube current sampling signal is larger than the compensation signal; when the turn-off signal of the main switching tube is changed from invalid to valid, the switch signal is changed from valid to invalid, and the main switching tube in the switching power circuit is turned off and the rectifying tube is turned on.
6. A switching circuit, characterized in that: a control circuit comprising the switching power supply as claimed in any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711340056.1A CN107947579B (en) | 2017-12-14 | 2017-12-14 | Control circuit, control method and switching circuit of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711340056.1A CN107947579B (en) | 2017-12-14 | 2017-12-14 | Control circuit, control method and switching circuit of switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107947579A CN107947579A (en) | 2018-04-20 |
| CN107947579B true CN107947579B (en) | 2024-06-25 |
Family
ID=61944139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711340056.1A Active CN107947579B (en) | 2017-12-14 | 2017-12-14 | Control circuit, control method and switching circuit of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107947579B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113872445B (en) * | 2021-11-02 | 2023-09-12 | 珠海格力电器股份有限公司 | Switching power supply control circuit, method and device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207603450U (en) * | 2017-12-14 | 2018-07-10 | 杰华特微电子（杭州）有限公司 | The control circuit and switching circuit of Switching Power Supply |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8493047B2 (en) * | 2011-05-23 | 2013-07-23 | Alpha And Omega Semiconductor Incorporated | Constant on-time switching regulator implementing dual control loops |
| JP6031303B2 (en) * | 2012-09-13 | 2016-11-24 | ローム株式会社 | Switching regulator, control circuit thereof, control method, and electronic device |
| CN102957303B (en) * | 2012-12-10 | 2015-01-07 | 成都芯源***有限公司 | Control circuit, switch converter and control method thereof |
| CN105262337B (en) * | 2015-10-26 | 2018-01-02 | 矽力杰半导体技术(杭州)有限公司 | A kind of control circuit and control method of Switching Power Supply frequency reducing |
| CN205847092U (en) * | 2016-05-19 | 2016-12-28 | 杰华特微电子（杭州）有限公司 | ON-OFF control circuit and on-off circuit |
| CN105827123B (en) * | 2016-05-20 | 2018-08-21 | 杰华特微电子（杭州）有限公司 | Power converting circuit and its drive control circuit |
-
2017
- 2017-12-14 CN CN201711340056.1A patent/CN107947579B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207603450U (en) * | 2017-12-14 | 2018-07-10 | 杰华特微电子（杭州）有限公司 | The control circuit and switching circuit of Switching Power Supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107947579A (en) | 2018-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111183576B (en) | Method and controller for seamless mode transition in switching regulator | |
| US9991794B2 (en) | Hybrid capacitive-inductive voltage converter | |
| US8624566B2 (en) | Current-mode control switching regulator and operations control method thereof | |
| US7109692B1 (en) | High-speed PWM control apparatus for power converters with adaptive voltage position and its driving signal generating method | |
| CN107834847B (en) | Control circuit and control method of switching circuit and switching power supply circuit | |
| KR101912211B1 (en) | Soft start circuits and techniques | |
| CN112383224B (en) | BOOST circuit for improving transient response and application method thereof | |
| US20160248322A1 (en) | Fast response control circuit and control method thereof | |
| US8350541B2 (en) | Control circuit and method for a soft-start scheme of a switch mode power supply for a power amplifier | |
| US20050007167A1 (en) | PWM switching regulator control circuit | |
| US10320291B2 (en) | Control circuit and device with edge comparison for switching circuit | |
| CN108258895B (en) | Soft start circuit and power supply system | |
| CN1980026A (en) | Control circuit and control method for DC-DC converter | |
| US8928294B2 (en) | Step-up switching power supply | |
| US10110129B2 (en) | Switching control circuit, switching power supply device and electronic apparatus | |
| Fan et al. | Area-efficient on-chip DC–DC converter with multiple-output for bio-medical applications | |
| CN114003084B (en) | High-precision low-temperature-drift circuit structure | |
| TW201513538A (en) | Time signal generator and time signal generating method | |
| CN112688538A (en) | Quasi-constant on-time control circuit and switch converter and method thereof | |
| CN117175908B (en) | Switching converter with fast dynamic response and control method thereof | |
| CN110971107A (en) | Control method and control circuit of switch circuit and switch circuit | |
| CN107947579B (en) | Control circuit, control method and switching circuit of switching power supply | |
| CN108063554B (en) | Control circuit, control method and switching circuit of switching power supply | |
| CN108258896B (en) | Soft start circuit and power supply system | |
| US10243464B2 (en) | Power regulator with prevention of inductor current reversal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant |