CN206117487U - Switch circuit's control circuit and switching power supply circuit - Google Patents
Switch circuit's control circuit and switching power supply circuit Download PDFInfo
- Publication number
- CN206117487U CN206117487U CN201621008956.7U CN201621008956U CN206117487U CN 206117487 U CN206117487 U CN 206117487U CN 201621008956 U CN201621008956 U CN 201621008956U CN 206117487 U CN206117487 U CN 206117487U
- Authority
- CN
- China
- Prior art keywords
- current
- circuit
- voltage
- inductive current
- inductive
- 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.)
- Expired - Fee Related
Links
Landscapes
- Rectifiers (AREA)
Abstract
The utility model discloses a switch circuit's control circuit and switching power supply circuit, through output voltage among the detection circuitry or output current, when output voltage is less than predetermined reference voltage or when output current is less than predetermined reference current, increase inductive current's upper limit value and lower limit value, when output voltage is higher than predetermined reference voltage or output current when being higher than predetermined reference current, reduce inductive current's upper limit value and lower limit value, inductive current to in the circuit samples, obtains sample current, and when sample current rose to inductive current's upper limit value, the main switch pipe among the control circuit turn -offed, and when sample current reachd inductive current's lower limit value, control main switch piping led to. The utility model discloses when switching power supply circuit's output voltage or electric current increased or reduce, the inductive current response was overshoot very fast and not, and dropping of output voltage is very few to do not overshoot at the voltage recover in -process, circuit transient response is very fast.
Description
Technical field
This utility model is related to electronic circuit technology field, the control circuit and switch electricity of more particularly to a kind of on-off circuit
Source circuit.
Background technology
The on, off that existing on-off circuit passes through controlling switch pipe, carrys out controlled output voltage.Conventional on-off circuit
Including BUCK (blood pressure lowering) circuit (as shown in Figure 1a) and BOOST (boosting) circuit (as shown in Figure 1 b).In fixed-frequency control pattern,
Drive control circuit produces a clock signal for determining frequency, in the rising edge of the clock signal, main MOS conductings；When main MOS is turned on
Between reach certain hour, or inductive current is reached after certain value, main MOS shut-offs.When the rising for next clock signal occur
Along when, main MOS is turned on again, so circulation.The waveform of clock signal and main MOS Continuity signals TON is as shown in Figure 2.This control
Mode processed can realize determining frequency, but the transient response of circuit is slow, when there is saltus step in output loading, output voltage occur compared with
Overshoot for a long time and fall.
It is described as follows by taking load jump in BUCK circuits as an example：BUCK circuits as shown in Figure 1a include main switch M00,
Second switch pipe D00, electric capacity C00, electric capacity C01, inductance L00 and load.Wherein, first switch pipe M00 be metal-oxide-semiconductor, second
Switching tube D00 is fly-wheel diode, and Vin is the input voltage of BUCK circuits, and Vout is the output voltage of BUCK circuits, by driving
Dynamic control circuit is controlled to main switch M00.When load current changes from small to big saltus step, output voltage Vout is reduced, FB
For the partial pressure of output voltage, FB is also reduced, therefore the voltage of the output VC (offset voltage) of amplifier is raised.After VC voltages are raised,
The ON time of main switch M00 can increase, but main switch M00 is needed when the rising edge of clock signal just can be turned on,
And now due to the increase of load current, output voltage has dropped to relatively low value, and main switch M00 ON times
There are the restriction (because there is clock signal to exist, maximum ON time is shorter than clock cycle) of maximum ON time, therefore not only inductance
Occur current over pulse on electric current, and output voltage drops larger, and overshoot is easily produced in voltage recovery process,
Circuit transient response is slower.Load current, clock signal, main switch M00 Continuity signal TON, inductive current, feedback voltage FB
With the variation relation of offset voltage VC as shown in Figure 3 a.On the contrary, in load current saltus step from large to small, output voltage Vout
Raise, FB is the partial pressure of output voltage, FB is also raised, therefore the voltage of the output VC of amplifier is reduced.After VC voltages are reduced, master opens
Closing the ON time of pipe M00 can be reduced, and because main switch M00 is turned in the rising edge of clock signal, and have minimum conducting
Time, in minimum ON time, output voltage can be raised, therefore the overshoot of output voltage is larger, and circuit transient response is slower.
The change of load current, clock signal, main switch M00 Continuity signal TON, inductive current, feedback voltage FB and offset voltage VC
Change relation is as shown in Figure 3 b.
As can be seen here, existing on-off circuit is during the fixed-frequency control for realizing clock signal, the transient response of circuit
Speed is slow, and when output loading occurs saltus step, output voltage occurs the overshoot of long period and falls.
Utility model content
To overcome traditional on-off circuit during the fixed-frequency control for realizing clock signal, the transient response speed of circuit
Slowly, and when there is saltus step in output loading, overshoot that output voltage occurs the long period and the technical problem fallen, this reality
With the control method and switching power circuit of a kind of on-off circuit of new offer.
This utility model provides a kind of control circuit of on-off circuit, and the circuit includes that instruction current obtains circuit, adjustment
Device, inductive current control circuit and drive circuit；
The instruction current obtains output voltage or output current in crossing detector circuit, and by the output voltage or
Output current is converted to instruction current and exports to the adjustor；
, according to the instruction current and default compensation current, the higher limit of adjustment inductive current is with for the adjustor
Limit value；
The inductive current control circuit connects the inductive current in the adjustor, the drive circuit and circuit
Sampling end；The inductive current control circuit is sampled to the inductive current in circuit, obtains sample rate current, and according to described
The higher limit and lower limit of sample rate current and inductive current, generates switching signal, and by the drive circuit in circuit
Main switch is controlled, and when the sample rate current rises to the higher limit of inductive current, controls the main switch shut-off,
When the sample rate current reaches the lower limit of inductive current, the main switch conducting is controlled.
As a kind of embodiment, the instruction current obtain circuit include load voltage sampling unit, voltage ratio compared with
Unit and voltage turn current unit；
The load voltage sampling unit turns current unit and is sequentially connected with the voltage comparison unit and voltage；
The load voltage sampling unit is sampled to the voltage at the load two ends in circuit, obtains sampled voltage and defeated
Go out to the voltage comparison unit；The size of the voltage comparison unit sampled voltage and default reference voltage,
And the voltage signal that obtains will be compared export and turn current unit to the voltage and changed, obtain instruction current and export to institute
State adjustor.
Used as a kind of embodiment, the load voltage sampling unit is electric resistance partial pressure type sample circuit.
Used as a kind of embodiment, the voltage comparison unit is operational amplifier；
The positive input of the operational amplifier connects default reference voltage, the negative input connection load electricity
The outfan of pressure sampling unit, the outfan of the operational amplifier connects the input that the voltage turns current unit.
Used as a kind of embodiment, the adjustor is adder or subtractor；
The first input end of the adder or subtractor connects the outfan that the voltage turns current unit, the second input
The outfan of the default compensation current of end connection, the adder or subtractor connects the inductive current control circuit.
Used as a kind of embodiment, when the adjustor is adder, the instruction current is inductive current lower limit
Value；When the adjustor is subtractor, the instruction current is inductive current higher limit.
Used as a kind of embodiment, the inductive current control circuit includes Zero-cross comparator circuit；
Whether the Zero-cross comparator circuit is used to judge the sample rate current less than zero, and is judging that the sample rate current is little
When zero, output control signal is with the synchronous rectifier in breaking circuit.
Conceived based on same utility model, this utility model also provides a kind of switching power circuit, the switching power circuit
Including inductance, main switch, and the control circuit of the on-off circuit described in any of the above-described.
This utility model is compared to the beneficial effect of prior art：
The control method and control circuit of the on-off circuit that this utility model is provided, by the output voltage in detection circuit
Or output current, when output voltage is less than default reference voltage or when output current is less than default reference current, increase
The higher limit and lower limit of big inductive current；When output voltage is higher than default reference voltage or output current is higher than default
During reference current, the higher limit and lower limit of inductive current is reduced；Inductive current in circuit is sampled, sampling electricity is obtained
Stream, when the sample rate current rises to the higher limit of inductive current, the main switch shut-off in control circuit, when the sampling
When electric current reaches the lower limit of inductive current, the main switch conducting is controlled.The switching power circuit that this utility model is provided,
Including the control circuit of inductance, main switch and the on-off circuit.
The control method and control circuit of the on-off circuit provided using this utility model, and including the control circuit
Switching power circuit, when output voltage or output current change from small to big saltus step, inductive current during stable state than encountering ahead of time
The lower limit of inductive current, the turn-off time of main switch can shorten, and ON time becomes big, and the control method does not have maximum to lead
The restriction of logical time, inductive current can increase more quickly, therefore when load current increases, inductive current response quickly and
Without overshoot, dropping for output voltage is considerably less, and without overshoot in voltage recovery process, circuit transient response is very
Hurry up.On the contrary, in output voltage or output current saltus step from large to small, inductive current is touched less than inductive current lower limit, it is main
Switching tube can be turned off always, the lower limit until encountering inductive current.Restriction of the control method without minimum ON time, it is main
The turn-off time of switching tube does not limit, and inductive current can reduce more quickly, therefore when load current reduces, inductance electricity
Quickly and without overshoot, the overshoot of output voltage is considerably less, and circuit transient response is very fast for stream response.
Description of the drawings
Fig. 1 a are BUCK (blood pressure lowering) electrical block diagram in background technology；
Fig. 1 b are BOOST (boosting) electrical block diagram in background technology；
Fig. 2 is the conducting letter of clock signal and main switch of the existing on-off circuit in the case where frequency pattern is determined in background technology
The waveform diagram of number TON；
When Fig. 3 a are the ascending saltus step of load current in background technology in existing on-off circuit, load current, when
The variation relation schematic diagram of clock signal, the Continuity signal TON of main switch, inductive current, feedback voltage FB and offset voltage VC；
When Fig. 3 b are the descending saltus step of load current in background technology in existing on-off circuit, load current, when
The variation relation schematic diagram of clock signal, the Continuity signal TON of main switch, inductive current, feedback voltage FB and offset voltage VC；
The schematic flow sheet of the control method of the on-off circuit that Fig. 4 is provided for the embodiment of this utility model one；
Fig. 5 be Fig. 4 shown in on-off circuit control method in inductive current and main switch Continuity signal TON it
Between variation relation schematic diagram；
The structural representation of the control circuit of the on-off circuit that Fig. 6 is provided for the embodiment of this utility model one；
The structural representation of the control circuit of the on-off circuit that Fig. 7 is provided for another embodiment of this utility model；
Fig. 8 be the control circuit of on-off circuit shown in Fig. 6 in load current, main MOS Continuity signals TON, inductive current,
Waveform diagram between feedback voltage FB and offset voltage VC；
Fig. 9 be the control circuit of on-off circuit shown in Fig. 7 in load current, main MOS Continuity signals TON, inductive current,
Waveform diagram between feedback voltage FB and offset voltage VC；
Inductance electricity when Figure 10 is that the control circuit of the on-off circuit shown in Fig. 6 and Fig. 7 is operated in DCM patterns, in circuit
Variation relation schematic diagram between stream and offset voltage VC.
Specific embodiment
Below in conjunction with accompanying drawing, and technical characteristic and advantage of other above-mentioned to this utility model are carried out clearly and completely
Description, it is clear that described embodiment is only section Example of the present utility model, rather than whole embodiments.
This utility model embodiment provides a kind of control method of on-off circuit, as shown in figure 4, comprising the following steps：
S100, detection circuit in output voltage or output current, when output voltage be less than default reference voltage when or
When output current is less than default reference current, increase the higher limit and lower limit of inductive current；When output voltage is higher than pre-
If reference voltage when or output current be higher than default reference current when, reduce inductive current higher limit and lower limit；
S200, the inductive current in circuit is sampled, sample rate current is obtained, when sample rate current rises to inductive current
Higher limit when, in control circuit main switch shut-off, when sample rate current reach inductive current lower limit when, control master opens
Close pipe conducting.
As shown in figure 5, in on-off circuit, inductive current is provided with upper and lower bound, when inductive current is risen on electric current
In limited time, then main switch shut-off；When inductive current is equal to (equivalent to reaching) lower current limit, then main switch conducting.This reality
With new based on above control principle, by adjusting the upper and lower limit of inductive current come controlled output electric current, so as to controlled output electricity
Pressure.The control mode transient response is fast, when there is saltus step in output loading, the overshoot of output voltage and to fall recovery all very fast.
Specifically, when output voltage or output current change from small to big saltus step, the switch electricity provided using this utility model
The control method on road, can make inductive current than the lower limit of encountering inductive current ahead of time during stable state, so that main switch
Turn-off time shorten, ON time becomes big, and restriction of the control method without maximum ON time, and inductive current can be more
Rapidly increase, therefore when load current increases, quickly and without overshoot, output voltage drops very for inductive current response
It is few, and without overshoot in voltage recovery process, circuit transient response is very fast.On the contrary, in output voltage or output electricity
During stream saltus step from large to small, inductive current is touched less than inductive current lower limit, and main switch can be turned off always, until encountering inductance
The lower limit of electric current.Restriction of the control method without minimum ON time, the turn-off time of main switch does not limit, inductance
Electric current can reduce more quickly, therefore when load current reduces, inductive current response is quickly and without overshoot, output voltage
Overshoot it is considerably less, circuit transient response is very fast.
Further, in the on-off circuit of constant pressure output, this utility model works as output voltage by detecting output voltage
During less than default reference voltage, increase the higher limit and lower limit of inductive current；When output voltage higher than default with reference to electricity
During pressure, the higher limit and lower limit of inductive current is reduced.
In the on-off circuit of constant current output, this utility model is preset by detecting output current when output current is less than
Reference current when, increase inductive current higher limit and lower limit；When output current is higher than default reference current, reduce
The higher limit and lower limit of inductive current.
In the on-off circuit of constant pressure output, step S200 can be realized by step in detail below：
S210, the sampled voltage for obtaining output voltage in real time；
S220, sampled voltage is compared with default reference voltage, and voltage is compensated according to comparative result；
S230, offset voltage is changed, obtain instruction current；
S240, according to default compensation current and instruction current, adjust the higher limit and lower limit of inductive current.
Above-mentioned instruction current is generally voltage signal, by offset voltage take advantage of in certain proportion, along with or deduct certain
It is worth to, it is obtained can connect the circuit realiration such as adder or subtractor with passing ratio circuit.
Additionally, for such case that the auxiliary switch pipe in on-off circuit is synchronous rectifier rather than fly-wheel diode, this
The control method of the on-off circuit that utility model is provided, it is further comprising the steps of：Inductive current in circuit is sampled,
After obtaining sample rate current, whether sample rate current is judged less than zero, if so, synchronous rectifier then in breaking circuit.
When on-off circuit is in DCM (discontinuous conduction mode), when the lower limit of inductive current is less than 0, if afterflow
Diode, then inductive current be reduced to 0, be not in negative current, inductive current is always held at 0, and offset voltage rises, inductance
The upper and lower limit of electric current all increases, and when the lower limit of inductive current is increased above 0, that is, sample rate current is equal to inductance
The lower limit of electric current, main switch conducting；If synchronous rectifier, then inductive current is reduced to 0, and synchronous rectifier is turned off
If (synchronous rectifier is not turned off, and has negative current), inductive current is always held at 0, and offset voltage rises, inductive current
Upper limit value and lower limit value all increase, when the lower limit of inductive current is increased above 0, that is, sample rate current be equal to inductance electricity
The lower limit of stream, main switch conducting.
Conceived based on same utility model, this utility model additionally provides a kind of control circuit of on-off circuit, including finger
Make current acquisition circuitry, adjustor, inductive current control circuit and drive circuit.
Wherein, instruction current obtains the output voltage or output current in crossing detector circuit, and by output voltage or defeated
Go out electric current and be converted to instruction current to export to adjustor；Adjustor is according to instruction current and default compensation current, adjustment electricity
The higher limit and lower limit of inducing current；Inductance electricity in inductive current control circuit connection adjustor, drive circuit and circuit
The sampling end of stream；Inductive current control circuit is sampled to the inductive current in circuit, obtains sample rate current, and according to sampling
The higher limit and lower limit of electric current and inductive current, generates switching signal, and by drive circuit to the main switch in circuit
It is controlled, when sample rate current rises to the higher limit of inductive current, control main switch shut-off, when sample rate current reaches electricity
During the lower limit of inducing current, control main switch conducting.
Above-mentioned adjustor can be adder, or subtractor.When adjustor is adder, instruction current is electricity
Inducing current lower limit；When adjustor is subtractor, instruction current is inductive current higher limit.Specific implementation is as follows：
The control circuit of the on-off circuit provided referring to Fig. 6, the embodiment of this utility model one, including instruction current acquisition electricity
Road, adder U02, inductive current control circuit U06 and drive circuit U07.
Instruction current obtains output voltage or output current in crossing detector circuit, and by output voltage or output current
Be converted to instruction current to export to adder U02.Instruction current obtains circuit includes load voltage sampling unit (including institute in figure
The resistance R02 and R01 for showing), amplifier (operational amplifier) U00 and Voltage-current conversion circuit U01.
Adder U02 is used for when output current (i.e. load current) changes from small to big saltus step, increases the upper limit of inductive current
Value and lower limit；When output current saltus step from large to small, the higher limit and lower limit of inductive current is reduced.Inductive current is controlled
The sampling end of inductive current in connection adder U02 of circuit U 06, drive circuit U07 and circuit.
As shown in fig. 6, inductive current control circuit U06 is sampled to the electric current of inductance L00, so inductance electricity in circuit
The sampling end of stream can be arranged on the input of inductance L00, it is also possible to be arranged on main switch M00 ends, or diode D00
End.
On-off circuit output voltage Vout obtains FB control sources to amplifier U00 through divider resistance R01, R02 partial pressure
Negative input end, the positive input terminal of amplifier U00 connects a default reference voltage Vref 1.The outfan VC of amplifier U00 is through voltage
Turn current circuit U01, obtain instruction current, the instruction current controls the lower limit of inductive current.Typically in drive control circuit,
The inductive current for sampling is voltage signal, therefore the output of Voltage-current conversion circuit U01, i.e. instruction current are also voltage letter
Number.And the inductive current lower limit can be the value less than 0.The instruction current of control inductive current lower limit is input to adder
One input of U02, default compensation electric current Δ i is connected to another input of adder U02.Wherein, default compensation electricity
Stream Δ i can be a fixed value, or a variable value.Adder U02 is electric by inductive current lower limit and default compensation
Stream Δ i is added, and obtains inductive current higher limit.The inductive current upper limit and inductive current lower limit are all connected to inductive current control electricity
The input of road U06, inductive current control circuit U06 output switching signal, switching signal drives master switch through drive circuit U07
Pipe M00.
It should be added that, when the sustained diode 00 in on-off circuit is devices, the synchronization
The control signal of rectification metal-oxide-semiconductor is also driven by drive circuit U07.The value that amplifier U00 passes through regulation its outfan VC, so as to adjust
Output voltage so that FB voltages are equal to default reference voltage Vref 1, so as to controlled output voltage.
Specifically, when output voltage is low, then FB voltages are less than default reference voltage Vref 1, and VC becomes big, inductance electricity
Flow down limit and become big, the lower limit of inductive current obtains the higher limit of inductive current, inductive current plus default compensation electric current Δ i
Control circuit U06 obtains switching signal according to the controlling value of inductive current upper and lower limit, and by drive circuit U07 master switch is driven
The switch of pipe M00, inductive current increase, output voltage increase.Conversely, when output voltage is higher, then FB voltages are more than default
Reference voltage Vref 1, VC diminishes, and inductive current lower limit diminishes, and the lower limit of inductive current adds default compensation electric current Δ i
The higher limit of inductive current is obtained, inductive current control circuit U06 is switched according to the controlling value of inductive current upper and lower limit
Signal, drives the switch of main switch M00, inductive current to reduce by drive circuit U07, and output voltage reduces.
When default compensation electric current Δ i is a fixed value, then the indefinite frequency of switching frequency；If necessary to fixed frequency, then can be with
By controlling default compensation electric current Δ i come controlling switch frequency.
Another kind is by way of subtractor is realized as shown in fig. 7, Voltage-current conversion circuit U01 produces the upper of inductive current
Limit value, and an input of subtractor U12 is input to, default compensation electric current Δ i also enters into another of subtractor U12
Input.The higher limit of inductive current deducts default compensation electric current Δ i, obtains the lower limit of inductive current.Inductive current is obtained
The lower limit of higher limit and inductive current is all input to inductive current control circuit U06.
Below with BUCK circuits in, illustrate as a example by load jump.
When load current changes from small to big saltus step, output voltage Vout is reduced, and FB is the partial pressure of output voltage, and FB also drops
It is low, therefore the VC voltages rising of amplifier output.After VC voltages are raised, the upper limit value and lower limit value of inductive current is big with time-varying, inductive current
Than encountering inductive current lower limit ahead of time during stable state, the turn-off time of main switch M00 shortens immediately, and ON time becomes immediately big,
And restriction of the control mode without maximum ON time, inductive current can increase more quickly, therefore in load current
During increase, quickly and without overshoot, dropping for output voltage is considerably less, and does not have in voltage recovery process for inductive current response
There is overshoot, circuit transient response is very fast.Load current, main switch Continuity signal TON, inductive current, feedback voltage FB and
Offset voltage VC is as shown in Figure 8.
In load current saltus step from large to small, output voltage Vout is raised, and FB is the partial pressure of output voltage, and FB also rises
Height, therefore the voltage reduction of amplifier VC.After VC voltages are reduced, the upper limit value and lower limit value of inductive current diminishes simultaneously, and inductive current is touched not
To inductive current lower limit, main switch M00 can be turned off always, until encountering inductive current lower limit.The control mode is without minimum
The restriction of ON time, the turn-off time of main switch does not limit, and inductive current can reduce more quickly, therefore in load
During the reduction of electric current, quickly and without overshoot, the overshoot of output voltage is considerably less, and circuit transient response is very for inductive current response
Hurry up.Load current, main MOS Continuity signals TON, inductive current, feedback voltage FB and offset voltage VC are as shown in Figure 9.
Additionally, for the auxiliary switch pipe (sustained diode 00) in on-off circuit for synchronous rectifier such case, this
The control circuit of the on-off circuit that utility model is provided, wherein inductive current control circuit U06 include Zero-cross comparator circuit, zero passage
Comparison circuit is used to judge sample rate current whether less than zero, and when sample rate current is judged less than zero, and output control signal is closing
Synchronous rectifier in deenergizing.
Referring to Figure 10, when on-off circuit is in DCM (discontinuous conduction mode), when the lower limit of inductive current is less than 0, such as
Fruit is fly-wheel diode, then inductive current is reduced to 0, is not in negative current, and inductive current is always held at 0, offset voltage
VC rises, the lower limit increase of inductive current, and when being increased above 0, that is, sample rate current is equal under inductive current
Limit value, main switch M00 conductings；If synchronous rectifier, then inductive current is reduced to 0, by synchronous rectifier shut-off (if
Synchronous rectifier is not turned off, then have negative current), inductive current is always held at 0, and offset voltage VC rises, inductive current
Lower limit increases, and when being increased above 0, that is, sample rate current is equal to the lower limit of inductive current, and main switch M00 leads
It is logical.
Conceived based on same utility model, this utility model also provides a kind of switching power circuit, the switching power circuit
Including inductance, main switch, and the control circuit of above-mentioned on-off circuit.
This utility model by adjust inductive current upper and lower limit come controlled output electric current, so as to controlled output voltage.This
The switching power circuit transient response of utility model is fast, when output loading occurs saltus step, the overshoot of output voltage and falls extensive
It is multiple all very fast.
Specific embodiment above, has been carried out further to the purpose of this utility model, technical scheme and beneficial effect
Describe in detail, it will be appreciated that these are only specific embodiment of the utility model, be not used to restriction of the present utility model
Protection domain.Particularly point out, it is to those skilled in the art, all within spirit of the present utility model and principle, done
Any modification, equivalent substitution and improvements etc., should be included within protection domain of the present utility model.
Claims (6)
1. a kind of control circuit of on-off circuit, it is characterised in that obtain circuit, adjustor, inductive current including instruction current
Control circuit and drive circuit；
The instruction current obtains output voltage or output current in crossing detector circuit, and by the output voltage or output
Electric current is converted to instruction current and exports to the adjustor；
The adjustor adjusts the higher limit and lower limit of inductive current according to the instruction current and default compensation current
Value；
The inductive current control circuit connects the sampling of the inductive current in the adjustor, the drive circuit and circuit
End；The inductive current control circuit is sampled to the inductive current in circuit, obtains sample rate current, and according to the sampling
The higher limit and lower limit of electric current and inductive current, generates switching signal, and the master in circuit is opened by the drive circuit
Close pipe to be controlled, when the sample rate current rises to the higher limit of inductive current, control the main switch shut-off, work as institute
When stating the lower limit of sample rate current arrival inductive current, the main switch conducting is controlled.
2. the control circuit of on-off circuit according to claim 1, it is characterised in that the instruction current obtains circuit bag
Include load voltage sampling unit, voltage comparison unit and voltage and turn current unit；
The load voltage sampling unit turns current unit and is sequentially connected with the voltage comparison unit and voltage；
The load voltage sampling unit in circuit load two ends voltage sample, obtain sampled voltage and export to
The voltage comparison unit；The size of the voltage comparison unit sampled voltage and default reference voltage, and will
The voltage signal that obtains of comparison exports and turns current unit to the voltage and changed, and obtains instruction current and exports to the tune
Whole device.
3. the control circuit of on-off circuit according to claim 2, it is characterised in that the adjustor is adder or subtracts
Musical instruments used in a Buddhist or Taoist mass；
The first input end of the adder or subtractor connects the outfan that the voltage turns current unit, and the second input connects
The outfan for connecing default compensation current, the adder or subtractor connects the inductive current control circuit.
4. the control circuit of on-off circuit according to claim 3, it is characterised in that when the adjustor is adder
When, the instruction current is inductive current lower limit；When the adjustor is subtractor, the instruction current is inductive current
Higher limit.
5. the control circuit of on-off circuit according to claim 1 and 2, it is characterised in that the inductive current control electricity
Road includes Zero-cross comparator circuit；
Whether the Zero-cross comparator circuit is used to judge the sample rate current less than zero, and is judging the sample rate current less than zero
When, output control signal is with the synchronous rectifier in breaking circuit.
6. a kind of switching power circuit, including inductance and main switch, it is characterised in that also including any one of claim 1 to 5
The control circuit of described on-off circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621008956.7U CN206117487U (en) | 2016-08-31 | 2016-08-31 | Switch circuit's control circuit and switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621008956.7U CN206117487U (en) | 2016-08-31 | 2016-08-31 | Switch circuit's control circuit and switching power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206117487U true CN206117487U (en) | 2017-04-19 |
Family
ID=58516718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621008956.7U Expired - Fee Related CN206117487U (en) | 2016-08-31 | 2016-08-31 | Switch circuit's control circuit and switching power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206117487U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300926A (en) * | 2016-08-31 | 2017-01-04 | 杰华特微电子（张家港）有限公司 | The control circuit of on-off circuit and control method, switching power circuit |
| CN107144798A (en) * | 2017-06-21 | 2017-09-08 | 杰华特微电子（张家港）有限公司 | Abnormal detection circuit and method and Switching Power Supply |
| CN110687439A (en) * | 2018-07-06 | 2020-01-14 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection method for high-side drive switch |
| CN113252974A (en) * | 2021-07-01 | 2021-08-13 | 钰泰半导体南通有限公司 | Load current detection circuit |
| TWI753801B (en) * | 2021-03-18 | 2022-01-21 | 通嘉科技股份有限公司 | Control methods for changing minimum on-time of synchronous rectifier and related synchronous rectifier controllers |
-
2016
- 2016-08-31 CN CN201621008956.7U patent/CN206117487U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300926A (en) * | 2016-08-31 | 2017-01-04 | 杰华特微电子（张家港）有限公司 | The control circuit of on-off circuit and control method, switching power circuit |
| CN106300926B (en) * | 2016-08-31 | 2018-08-28 | 杰华特微电子（张家港）有限公司 | The control circuit and control method of switching circuit, switching power circuit |
| CN107144798A (en) * | 2017-06-21 | 2017-09-08 | 杰华特微电子（张家港）有限公司 | Abnormal detection circuit and method and Switching Power Supply |
| CN107144798B (en) * | 2017-06-21 | 2024-03-19 | 杰华特微电子（张家港）有限公司 | Abnormality detection circuit and method and switching power supply |
| CN110687439A (en) * | 2018-07-06 | 2020-01-14 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection method for high-side drive switch |
| CN110687439B (en) * | 2018-07-06 | 2020-10-27 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection method for high-side drive switch |
| TWI753801B (en) * | 2021-03-18 | 2022-01-21 | 通嘉科技股份有限公司 | Control methods for changing minimum on-time of synchronous rectifier and related synchronous rectifier controllers |
| CN113252974A (en) * | 2021-07-01 | 2021-08-13 | 钰泰半导体南通有限公司 | Load current detection circuit |
| CN113252974B (en) * | 2021-07-01 | 2021-11-05 | 钰泰半导体股份有限公司 | Load current detection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106300926B (en) | The control circuit and control method of switching circuit, switching power circuit | |
| CN206117487U (en) | Switch circuit's control circuit and switching power supply circuit | |
| CN103023326B (en) | Constant time control method, control circuit and switching regulator using same | |
| CN103607825B (en) | Thyristor regulating optical circuit and dimming controlling method | |
| CN109995231B (en) | Digital control method of Boost AC-DC constant voltage power supply | |
| CN101707837B (en) | LED drive circuit of source driver with change of output voltage and induction quantity keeping constant current | |
| CN104184348B (en) | Power supply system | |
| CN109713921A (en) | A kind of synchronous commutating control circuit, control method and switching circuit | |
| CN106130321B (en) | A kind of control method of switching circuit, control circuit and switch circuit devices | |
| CN106300972B (en) | A kind of control method of switching circuit, control circuit and switch circuit devices | |
| CN104518667A (en) | Semiconductor device and control method thereof | |
| CN107026566B (en) | Ripple modulation determines turn-on time power supply unit and its control circuit and control method | |
| CN103716965A (en) | LED driving device and control circuit and output current detection circuit thereof | |
| CN105636303A (en) | Constant-current control circuit and method | |
| CN104902648A (en) | LED light-adjustment circuit with silicon controlled rectifier, and light-adjustment method | |
| CN108448895A (en) | The simulation demagnetization method of sampling and system of Switching Power Supply output sampling | |
| CN103281829B (en) | A kind of LED drive circuit | |
| CN106961216B (en) | Novel constant exports electric current BUCK circuit | |
| CN104066246B (en) | Light emitting element driving method, light emitting element driver and controller thereof | |
| CN106162998B (en) | A kind of LED drive controls circuit, control device and control method | |
| CN206041804U (en) | Switch circuit's control circuit and switch circuit device | |
| CN102299623A (en) | Control method for DC-DC (direct current-direct current) lock-in tube and device thereof | |
| CN203086362U (en) | Switching power supply and controller thereof | |
| CN103630735B (en) | A kind of voltage slope change detection circuit and method | |
| CN106160458A (en) | Improve the BOOST circuit of transient response |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170419 Termination date: 20180831 |