CN206041804U - Switch circuit's control circuit and switch circuit device - Google Patents
Switch circuit's control circuit and switch circuit device Download PDFInfo
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- CN206041804U CN206041804U CN201621011829.2U CN201621011829U CN206041804U CN 206041804 U CN206041804 U CN 206041804U CN 201621011829 U CN201621011829 U CN 201621011829U CN 206041804 U CN206041804 U CN 206041804U
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Abstract
The utility model discloses a switch circuit's control circuit and switch circuit device, the utility model discloses beginning to switch on from first switch tube and beginning the timing, finish to switch on as the period 1 to same cycle second power tube, whether the judgement period 1 reaches a schedule time, surpass a schedule time when the period 1, then reduce instruction inductive current's bound difference to switch circuit's switching frequency is adjusted according to instruction inductive current's upper limit value, lower limit value and sampling inductive current, when the period 1 misses a schedule time, then improve instruction inductive current's bound difference to according to instruction inductive current's upper limit value, lower limit value and sampling inductive current adjustment switch circuit's switching frequency, thereby control switch circuit's period 1 equalled with the first time of predetermineeing or its difference control in certain extent, and realization switch circuit decides the frequency.
Description
Technical field
This utility model is related to field of circuit technology, more particularly to a kind of control circuit of on-off circuit and on-off circuit dress
Put.
Background technology
In the on-off circuit of current switch power supply, by the on, off of controlling switch pipe come controlled output voltage.Institute
Stating on-off circuit includes BUCK (blood pressure lowering) circuit, BOOST (boosting) circuit etc..Wherein, Fig. 1 is the BUCK (blood pressure lowering) circuit；
Fig. 2 is the BOOST (boosting) circuit.As shown in figure 1, the BUCK circuits include first switch pipe M00, the second power tube
D00 and inductance L00, wherein, first switch pipe M00 is metal-oxide-semiconductor, and the second power tube D00 is fly-wheel diode, and Vin is that BUCK is electric
The input voltage on road, Vout are the output voltage of BUCK circuits, first switch pipe M00 are controlled by drive control circuit
System, in other embodiments, the second power tube D00 can also be devices, by drive control circuit to the
One switching tube, devices are controlled.As shown in Fig. 2 the BOOST circuits generally include first switch pipe M01,
Second power tube D01 and inductance L01, wherein, first switch pipe M01 is metal-oxide-semiconductor, and the second power tube D01 is fly-wheel diode,
Input voltages of the Vin for BOOST circuits, output voltages of the Vout for BOOST circuits, by drive control circuit to first switch
Pipe M01 is controlled, and in other embodiments, the second power tube D01 can also be devices, by driving
Control circuit is controlled to first switch pipe, devices.
Wherein by taking BUCK circuits as an example, when first switch pipe M00 is turned on, inductive current rises；First switch pipe M00 is closed
Disconnected, when fly-wheel diode (or devices) is turned on, inductive current declines.Fig. 3 is led for first switch pipe in on-off circuit
The oscillogram of messenger TON and inductive current, as shown in Figure 3 a and Figure 3 b shows, the minimum of inductive current is more than 0, then on-off circuit
Continuous conduction mode (CCM) is operated in, when the minimum of inductive current is 0, then circuit is operated in discontinuous conduction mode (DCM),
Wherein, when inductive current is 0, main metal-oxide-semiconductor and fly-wheel diode are both off.
In on-off circuit some applications, it is desirable to keep the period 1 T of first switch pipe and the second power tube as far as possible
It is invariable, impact is produced on other load circuits to prevent on-off circuit to be operated in other operating frequencies.
Utility model content
The purpose of this utility model is to provide a kind of control circuit of on-off circuit, for stablizing first switch pipe and
The period 1 of two power tubes, it is to avoid impact is produced on other load circuits.
For reaching above-mentioned purpose, this utility model embodiment provides a kind of control circuit of on-off circuit, the switch
Circuit includes first switch pipe, and on-off circuit converts input voltage into output by the conducting of the first switch pipe and shut-off
With driving load, the control circuit includes voltage：
Continuity signal timing circuit, obtains the switching signal of first switch pipe, begins to turn on from first switch pipe and starts meter
When, terminate conducting as the period 1 to the second power tube of same cycle, judge whether the period 1 reaches the first pre- timing
Between, export judged result；
Instruction inductive current adjustment circuit, obtains instruction inductive current from on-off circuit, according to Continuity signal timing circuit
Judged result adjust instruction inductive current, when the period 1 is more than first scheduled time, then reduce instruction inductive current
Bound difference；When the period 1 being not up to for first scheduled time, then improve the bound difference of instruction inductive current；
Switch tube driving circuit, from on-off circuit obtain sampling inductive current, according to instruction inductive current higher limit, under
Limit value adjusts the switching frequency of on-off circuit with sampling inductive current.
Optionally, the Continuity signal timing circuit includes timing circuit and voltage comparator circuit；
Wherein, the timing circuit begins to turn on beginning timing from the first switch pipe, to the second work(of same cycle
When rate pipe terminates conducting, timing voltage is exported；
The timing voltage is compared by the voltage comparator circuit with the first reference voltage, when timing voltage is more than first
Reference voltage, then show when the period 1 is more than first scheduled time；When timing voltage is less than the first reference voltage, then show to work as
Period 1 was not up to for first scheduled time, exported judged result.
Optionally, the instruction inductive current adjustment circuit includes：Electric current bound difference adjusts circuit, electric current and adjusts
Device, output voltage feedback circuit,
The feedback input end of output voltage feedback circuit is connected with the load outputs of on-off circuit, is obtained and switch
The higher limit of the corresponding instruction inductive current of the inductive current of circuit or lower limit, and as instruction inductive current adjustment circuit
The first outfan；
The electric current bound difference is adjusted the input of circuit and is connected with the outfan of Continuity signal timing circuit, is passed through
Obtain the bound difference of the judged result regulating command inductive current of Continuity signal timing circuit；
Two inputs of rheonome outfan respectively with output voltage feedback circuit, electric current bound are poor
Value adjusts the outfan of circuit and is connected, and the outfan of the rheonome is defeated as instruct inductive current adjustment circuit second
Go out end, using the corresponding lower limit of the rheonome regulating command inductive current or higher limit.
Optionally, the rheonome is adder or subtractor, when the rheonome is adder, described
Output voltage feedback circuit obtains the lower limit of the instruction inductive current corresponding with the inductive current of on-off circuit, using addition
Device obtains the higher limit of instruction inductive current to instructing inductive current to be adjusted；When the rheonome is subtractor,
The output voltage feedback circuit obtains the higher limit of the instruction inductive current corresponding with the inductive current of on-off circuit, utilizes
Subtractor obtains the lower limit of instruction inductive current to instructing inductive current to be adjusted.
Optionally, the switch tube driving circuit and the first outfan, the second output for instructing inductive current adjustment circuit
End is connected, and obtains higher limit and the lower limit of instruction inductive current, and the switch tube driving circuit is also connected with on-off circuit, is obtained
The corresponding sampling inductive current of inductive current of on-off circuit is taken, the higher limit, lower limit and sampling according to instruction inductive current
The switching signal of the first switch pipe of inductive current adjustment on-off circuit.
Optionally, sampling inductive current is compared with the higher limit of inductive current, lower limit is instructed, when sampling inductance
Electric current reaches the higher limit of instruction inductive current, and the switching signal of first switch pipe occurs saltus step so that inductive current is reduced, when
Sampling inductive current reaches the lower limit of instruction inductive current, and the switching signal of first switch pipe occurs saltus step so that inductance electricity
Stream gravity is newly raised, and adjusts the switching frequency of on-off circuit by the switching signal of regulation first switch pipe.
This utility model embodiment additionally provides a kind of switch circuit devices with the control circuit.
This utility model compared to the beneficial effect of prior art is：
This utility model begins to turn on beginning timing from first switch pipe, terminates conducting to the second power tube of same cycle
As the period 1, judge whether the period 1 reached for first scheduled time, judged result, and control circuit is exported from switch electricity
The outfan on road obtains instruction inductive current, according to the judged result adjust instruction inductive current, and using the finger after adjustment
The upper lower limit value and sampling inductive current for making inductive current is compared, and adjusts the switch time of first switch pipe, so as to control
The period 1 of on-off circuit is equal with the first Preset Time or its difference controls within the specific limits, to realize fixed frequency.
Description of the drawings
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Needed for description, accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only that this practicality is new
Some embodiments of type, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of BUCK circuits of the prior art；
Fig. 2 is the circuit diagram of BOOST circuits of the prior art；
Fig. 3 a are sequential chart when BUCK circuits of the prior art are operated in continuous conduction mode；
Fig. 3 b are sequential chart when BUCK circuits of the prior art are operated in discontinuous conduction mode；
Electrical block diagrams of the Fig. 4 for the control circuit of the on-off circuit of this utility model first embodiment；
Electrical block diagrams of the Fig. 5 for the control circuit of the on-off circuit of this utility model second embodiment；
Electrical block diagrams of the Fig. 6 for the timing circuit of this utility model embodiment；
Electrical block diagrams of the Fig. 7 for the electric current bound difference regulation circuit of this utility model embodiment；
Sequential charts of the Fig. 8 for the control circuit of the on-off circuit of this utility model embodiment；
Schematic flow sheets of the Fig. 9 for the control method of the on-off circuit of this utility model embodiment.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is a part of embodiment of this utility model, rather than the enforcement of whole
Example.Based on the embodiment in this utility model, those of ordinary skill in the art are obtained under the premise of creative work is not made
The every other embodiment for obtaining, belongs to the scope of this utility model protection.
Embodiment one
This utility model embodiment provide firstly a kind of switch circuit devices, and the switch circuit devices include control electricity
Road and on-off circuit, the control circuit are connected with on-off circuit, and the period 1 and first for controlling switch circuit presets
Time is equal or its difference is controlled within the specific limits, under continuous conduction mode (CCM), and the period 1 is first switch
Pipe begins to turn on beginning timing, to the second power tube of same cycle terminate turn on time sum, while be equal to it is adjacent twice
Time between first switch pipe Continuity signal rising edge/trailing edge；Under discontinuous conduction mode (DCM), the period 1
Beginning timing is begun to turn on for first switch pipe, to the time sum that the second power tube of same cycle terminates to turn on, as electricity
Inducing current ascent stage and the total time of decline stage, the total time rise less than the adjacent pipe of first switch twice Continuity signal
Time between edge/trailing edge.And in this utility model embodiment, the same cycle is from the switch of first switch pipe believes
Number rising edge to switching signal trailing edge, and then the rising edge of the second power tube correspondence switching signal is to believing to inductive switch
Number the trailing edge corresponding cycle.
In the present embodiment, Fig. 4 is refer to, the on-off circuit is by taking BUCK circuits as an example to control circuit and on-off circuit
Circuit connecting relation illustrate.In other embodiments, those skilled in the art can be easy to be substituted for BUCK circuits
Other on-off circuits, will not be described here.
The on-off circuit includes：First switch pipe M00, the second power tube D00 and inductance L00, wherein, first switch pipe
M00 can be metal-oxide-semiconductor or other controlled tr tubes, and the second power tube D00 is fly-wheel diode, and Vin is the input of on-off circuit
Voltage, Vout are the output voltage of on-off circuit, first switch pipe M00 are controlled by drive control circuit, at other
In embodiment, the second power tube D00 can also be devices, by drive control circuit to first switch pipe
M00, devices are controlled.
Fig. 4 is refer to, the control circuit of the on-off circuit includes instructing inductive current adjustment circuit 10, Continuity signal meter
When circuit 20, switch tube driving circuit 30.
The instruction inductive current adjustment circuit 10 includes：Output voltage feedback circuit 11, electric current bound difference are adjusted
Circuit U 05, rheonome.
The output voltage feedback circuit 11 includes the first divider resistance R01, the second divider resistance R02, operational amplifier
U00, first voltage turn current circuit U01, and the load outputs of on-off circuit pass through the first divider resistance R01 and the second partial pressure electricity
Partial pressure end between resistance R02 is connected with the first input end of amplifier U00, and the second input connection first of amplifier U00 is joined
Examine voltage Vref1, the voltage V of the outfan of amplifier U00CTurn current circuit U01 through first voltage, obtain instructing inductance electricity
The lower limit of stream.The instruction inductive current lower limit can be the value less than 0.
The output voltage feedback circuit 11 utilizes the first divider resistance R01 and the second divider resistance R02 to obtain load electricity
The feedback voltage V of pressureFBAfterwards, by feedback voltage VFBWith the first reference voltage Vref1It is compared, and by output voltage through first
The lower limit for being converted to instruction inductive current of Voltage-current conversion circuit U01, by the higher limit of adjust instruction inductive current
And lower limit so that the period 1 of on-off circuit changes, and load voltage changes, while obtaining new feedback electricity
Pressure VFB, output comparison signal is further compared, until feedback voltage VFBEqual to the first reference voltage Vref1。
The electric current bound difference is adjusted circuit U 05 and is connected with the outfan of Continuity signal timing circuit 20, and acquisition is led
The judged result of the output of messenger timing circuit 20, according to when the second power tube of same cycle terminates conducting, if reach
First scheduled time, the bound difference of adjust instruction inductive current.
In the present embodiment, please also refer to Fig. 4, Fig. 7 and Fig. 8, the electric current bound difference adjusts the tool of circuit U 05
Body circuit includes：It is second current source I40, the 3rd current source I41, the first controlling switch K40, the second controlling switch K41, second electric
Hold C40, second voltage and turn current circuit U40, the control end of first controlling switch K40 and the electricity of Continuity signal timing circuit
Pressure ratio is connected compared with the UP signal output parts of circuit U 03, control end and the Continuity signal timing circuit of second controlling switch K41
The DOWN signal output parts of 20 voltage comparator circuit U03 are connected, the second current source I40, the series connection of the first controlling switch K40
The first series circuit is formed, it is in parallel with the second electric capacity C40 after the 3rd current source I41, the series connection of the second controlling switch K41 to be formed
Second parallel circuit, first series circuit and the second parallel circuit in series connect and junction point turns electric current electricity with second voltage
The input of road U40 is connected, and the second voltage turns the outfan of current circuit U40 and adjusts circuit as electric current bound difference
The outfan of U05.
It is when Continuity signal timing circuit is judged when the second power tube of same cycle terminates conducting, predetermined more than first
During the time, the first controlling switch K40 is turned off by the UP output signals of voltage comparator circuit U03, and DOWN output signals make the second control
System switch K41 conducting a period of times, then turn off again, so as to the electric charge on the second electric capacity C40 is bled off a part, reduce connection
Point voltage V2, Voltage-current conversion circuit will connect point voltage V2 and be converted into by a certain percentage instructing the bound difference of inductive current
Δ i, instructs bound difference DELTA i of inductive current to reduce.
When Continuity signal timing circuit 20 judges that the second power tube of same cycle terminates conducting, not up to first is pre-
When fixing time, then the second controlling switch K41 is turned off by the DOWN output signals of voltage comparator circuit U03, and UP output signals make
One controlling switch K40 conducting a period of time, then turn off again, so as to increase the electric charge on the second electric capacity C40, improve junction point electricity
Pressure V2, Voltage-current conversion circuit will connect point voltage V2 and be converted into by a certain percentage instructing bound difference DELTA i of inductive current,
Bound difference DELTA i of instruction inductive current increases.
In the present embodiment, refer to Fig. 4, the rheonome is adder U02, adder U02 respectively with
First voltage turns current circuit U01 and is connected with electric current bound difference regulation circuit U 05, and first voltage is turned current circuit U01
The lower limit of the instruction inductive current of generation adjusts the upper of the instruction inductive current of the generation of circuit U 05 plus electric current bound difference
Lower limit difference DELTA i, the higher limit of output order inductive current, outfan and the switch tube driving circuit 30 of adder U02
Inductive current control circuit U06 be connected.
In other embodiments, refer to Fig. 5, the rheonome can also be subtractor U12, the subtractor
U12 turns current circuit U01 respectively with first voltage and electric current bound difference adjusts circuit U 05 and is connected, and first voltage is turned electricity
The higher limit of the instruction inductive current that current circuit U01 is produced deducts electric current bound difference and adjusts the instruction electricity that circuit U 05 is produced
Bound difference DELTA i of inducing current, the lower limit of output order inductive current, the outfan and switching tube of the subtractor U12
Inductive current control circuit U06 of drive circuit 30 is connected.
After the Continuity signal timing circuit 20 obtains the switching signal of first switch pipe M00, from first switch pipe M00's
Beginning timing is begun to turn on, judges that the second power tube D00 of same cycle terminates conducting, if reached for first scheduled time, it is defeated
Go out judged result.
The Continuity signal timing circuit 10 includes timing circuit U04 and voltage comparator circuit U03, wherein, timing circuit
One end of U04 and the control end coupling (not shown) of first switch pipe M00, obtain the switching signal of the first switch pipe, institute
State timing circuit U04 and beginning timing is begun to turn on from the first switch pipe, when the second power tube of same cycle terminates conducting
When, export timing voltage.
The voltage comparator circuit U03 is by the timing voltage and the second reference voltage Vref2Compare, when timing voltage
More than the first reference voltage Vref2, then show when the second power tube of same cycle terminates conducting, more than first scheduled time
T；When timing voltage is less than the second reference voltage Vref2, then show, when the second power tube of same cycle terminates conducting, not reaching
To the first scheduled time T, judged result is exported.
Specifically, Fig. 6 is refer to, is the electrical block diagram of the timing circuit U04 of this utility model embodiment, it is described
Timing circuit U04 includes：First current source I20, the first charging capacitor C20 and the first charge switch pipe K20, first electric current
Source I20 is fixed current source or on-fixed current source, and the first charging capacitor C20 is connected with the first current source I20, and described
First charging capacitor C20 is in parallel with the first charge switch pipe K20, is charged to first by the switching signal of first switch pipe M00
Switching tube K20 is controlled, the outfan of the voltage output end of the first charging capacitor C20 as timing circuit U04.At this
In embodiment, by adjusting the size of the first current source I20 and the first charging capacitor C20 so that in the first scheduled time T, the
One charging capacitor C20 can be charged to the second reference voltage V justref2.When the Continuity signal of first switch pipe M00 it is long,
The time of one charge switch pipe K20 shut-offs is longer, and until the second power tube of same cycle terminates conducting, now first charges
The overlong time that electric capacity C20 charges, now voltage comparator circuit U03 is by the voltage output end of the first charging capacitor C20 output meter
When voltage (crest voltage of the first charging capacitor C20) with the first reference voltage Vref1It is compared, when timing voltage is more than
First reference voltage Vref1, then show when the second power tube of same cycle terminates conducting, more than the first scheduled time T, table
The period 1 of bright on-off circuit has exceeded the first scheduled time T, needs to reduce the period 1, exports judged result；When first
The Continuity signal of switching tube M00 is too short, and the time of the first charge switch pipe K20 shut-offs is too short, until the second work(of same cycle
Rate pipe terminates conducting, and the time that now the first charging capacitor C20 charges is too short, and now voltage comparator circuit U03 charges first
The timing voltage (i.e. the crest voltage of the first charging capacitor C20) of the voltage output end of electric capacity C20 and the first reference voltage Vref1
It is compared, when timing voltage is more than the first reference voltage Vref1, then show to terminate conducting when the second power tube of same cycle
When, not up to the first scheduled time T shows that the period 1 of on-off circuit has been not up to the first scheduled time T, needs raising
In one cycle, export judged result.
Instruction inductive current adjustment of the switch tube driving circuit 30 according to 20 output of instruction inductive current adjustment circuit
The ON time of the first switch pipe of on-off circuit, when the bound difference of instruction inductive current is reduced, according to instruction inductance electricity
The higher limit of stream, lower limit are reduced with sampling inductive current, the then ON time of first switch pipe so that switching frequency is uprised；
When the bound difference of instruction inductive current is improved, the higher limit, lower limit and sampling inductive current according to instruction inductive current,
Then the ON time of first switch pipe increases so that switching frequency step-down.
In the present embodiment, Fig. 4 or Fig. 5 is refer to, the switch tube driving circuit 30 includes inductive current control circuit
U06 and drive circuit U07, the first outfan of inductive current control circuit U06 and instruction inductive current adjustment circuit, the
Two outfans be connected, obtain instruction inductive current higher limit and lower limit, inductive current control circuit U06 also with switch
Circuit is connected, and obtains the corresponding sampling inductive current of inductive current of on-off circuit, and the sampling inductive current both can be with split
The inductive current on powered-down road is directly sampled acquisition, it is also possible to indirect to the electric current by sample first switch pipe and the second power tube
Obtain, the higher limit, lower limit and sampling inductive current according to instruction inductive current produces drive control signal, the driving
Control signal is strengthened driving force to drive first switch pipe by drive circuit U07.
In other embodiments, the inductive current control circuit is connected with on-off circuit, obtains the inductance of on-off circuit
The corresponding voltage of the corresponding sampling inductive current of electric current, when the bound difference of instruction inductive current is reduced, according to instruction inductance
The higher limit of electric current, lower limit voltage corresponding with sampling inductive current, then the ON time reduction of first switch pipe so that open
Close frequency to uprise；When the bound difference of instruction inductive current is improved, according to the instruction higher limit of inductive current, lower limit and adopt
The corresponding voltage of sample inductive current, then the ON time increase of first switch pipe so that switching frequency step-down.
Wherein, according to the instruction higher limit of inductive current, lower limit and sampling inductive current adjusting opening for on-off circuit
The concrete mode for closing frequency includes：Sampling inductive current is compared with the higher limit of inductive current, lower limit is instructed, when adopting
Sample inductive current reaches the higher limit of instruction inductive current, and the switching signal of first switch pipe occurs saltus step so that inductive current
Reduce, when sampling inductive current reaches the lower limit of instruction inductive current, the switching signal of first switch pipe occurs saltus step so that
Inductive current is raised again, adjusts the switching frequency of on-off circuit by the switching signal of regulation first switch pipe.It is corresponding
, the bound difference of inductive current is bigger, and the corresponding ON time of first switch pipe or turn-off time are also longer, on-off circuit
Switching frequency it is less；The bound difference of inductive current is less, the corresponding ON time of first switch pipe or turn-off time
Less, the switching frequency of on-off circuit is bigger.
In other embodiments, when the second power tube of on-off circuit is devices, the switching tube drives electric
Road is connected with the first outfan of inductive current adjustment circuit, the second outfan is instructed, and obtains the higher limit of instruction inductive current
And lower limit, the switch tube driving circuit is also connected with on-off circuit, obtains the corresponding sampling of inductive current of on-off circuit
Inductive current, the higher limit, lower limit and sampling inductive current according to instruction inductive current adjust the first switch of on-off circuit
Pipe and devices switching signal, by the turn-on and turn-off time of first switch pipe as far as possible with the first Preset Time
Unanimously.
Wherein, according to the instruction higher limit of inductive current, lower limit and sampling inductive current adjusting opening for on-off circuit
The concrete mode for closing frequency includes：Sampling inductive current is compared with the higher limit of inductive current, lower limit is instructed, when adopting
Sample inductive current reaches the switching signal of the higher limit of instruction inductive current, first switch pipe and devices to be occurred to jump
Become so that inductive current is reduced, when sampling inductive current reaches the lower limit of instruction inductive current, first switch pipe is whole with synchronous
There is saltus step in the switching signal of stream metal-oxide-semiconductor so that inductive current is raised again, by adjusting first switch pipe and synchronous rectification
The switching signal of metal-oxide-semiconductor is adjusting the switching frequency of on-off circuit.
Embodiment two
This utility model embodiment additionally provides a kind of control method of on-off circuit, and the on-off circuit includes that first opens
Guan Guan, it is negative to drive that on-off circuit converts input voltage into output voltage by the conducting of the first switch pipe with shut-off
Carry, refer to Fig. 9, the control method includes：
Step S101, begins to turn on beginning timing from first switch pipe, terminates conducting to the second power tube of same cycle
As the period 1, judge whether the period 1 reached for first scheduled time；
Step S102, when the period 1 is more than first scheduled time, then reduces the bound difference of instruction inductive current, and
Higher limit, lower limit according to instruction inductive current adjusts the switching frequency of on-off circuit with sampling inductive current；
Step S103, when the period 1 being not up to for first scheduled time, then the bound for improving instruction inductive current is poor
Value, and the higher limit according to instruction inductive current, lower limit adjust the switching frequency of on-off circuit with sampling inductive current.
Specifically, in the present embodiment, refer to by being described to the control method by taking the circuit of Fig. 4 as an example,
But the control method of on-off circuit of the present utility model is not limited to specific control circuit.
Execution step S101, begins to turn on beginning timing from first switch pipe, terminates to the second power tube of same cycle
As the period 1, conducting judges whether the period 1 reached for first scheduled time.
In the present embodiment, beginning timing is begun to turn on using timing circuit U04 in first switch pipe, judge same week
The time that the second power tube of phase terminates to turn on is the period 1, judges whether the period 1 reaches the first scheduled time T.
Fig. 6 and Fig. 7 is refer to, when the Continuity signal of first switch pipe occurs, the first charge switch pipe K20 first turns on one
Fix time, the time is considerably shorter than first switch pipe ON time, and such as 30ns, in order to multiple by the upper voltage of the first charging capacitor C20
Position is to 0.Subsequently the first charge switch pipe is disconnected, is charged to the first charging capacitor C20 using the first current source I20.Described
One current source I20 can be fixed current source, or on-fixed current source.In the present embodiment, it is electric by adjustment first
The size of stream source I20 and the first charging capacitor C20 so that in the first scheduled time T, the first charging capacitor C20 can be filled just
Electricity is to the first reference voltage Vref1.When the Continuity signal of first switch pipe M00 it is long, the first charge switch pipe K20 shut-off when
Between it is longer, until the second power tube of same cycle terminate conducting, the first charging capacitor C20 charge overlong time, now
Voltage comparator circuit U03 by the voltage output end of the first charging capacitor C20 output timing voltage (i.e. the first charging capacitor C20's
Crest voltage) and the first reference voltage Vref1It is compared, when timing voltage is more than the first reference voltage Vref1, then show first
Cycle is more than the first scheduled time T；When the Continuity signal of first switch pipe M00 it is too short, the first charge switch pipe K20 shut-off when
Between it is too short, until the second power tube of same cycle terminate conducting, the first charging capacitor C20 charge time it is too short, now electricity
Pressure ratio is compared with circuit U 03 by the timing voltage of the voltage output end of the first charging capacitor C20 (the i.e. peak value of the first charging capacitor C20
Voltage) and the first reference voltage Vref1It is compared, when timing voltage is less than the first reference voltage Vref1, then show the period 1
Not up to the first scheduled time T.
Execution step S102, when the period 1 is more than first scheduled time, then the bound for reducing instruction inductive current is poor
Value, and the higher limit according to instruction inductive current, lower limit adjust the switching frequency of on-off circuit with sampling inductive current.
In the present embodiment, when the period 1 is more than first scheduled time, judged result, electric current bound difference are sent
Adjust circuit and electric current bound difference is adjusted according to judged result, and instruction inductive current is obtained using adder or subtractor
Higher limit and lower limit, switch tube driving circuit 30 is using higher limit, lower limit and the sampling inductive current for instructing inductive current
The switching signal of switching tube is adjusted, the ON time of first switch pipe Continuity signal is reduced so that the switch letter of first switch pipe
Number cycle shorten, switching frequency is uprised, the period 1 such that it is able to controlling switch circuit it is equal with the first Preset Time or
Its difference is controlled within the specific limits.
Specifically, sampling inductive current is compared with the higher limit of inductive current, lower limit is instructed, when sampling inductance
Electric current reaches the higher limit of instruction inductive current, and the switching signal of first switch pipe occurs saltus step so that inductive current is reduced, when
Sampling inductive current reaches the lower limit of instruction inductive current, and the switching signal of first switch pipe occurs saltus step so that inductance electricity
Stream gravity is newly raised, and adjusts the switching frequency of on-off circuit by the switching signal of regulation first switch pipe.
When the on-off circuit includes first switch pipe and devices, according to instruction inductive current higher limit,
Lower limit is included with the method for the switching frequency of sampling inductive current adjustment on-off circuit：Will sampling inductive current and instruction inductance
The higher limit of electric current, lower limit are compared, when sampling inductive current reaches the higher limit of instruction inductive current, first switch pipe
There is saltus step with the switching signal of devices so that inductive current is reduced, when sampling inductive current reaches instruction inductance
There is saltus step in the switching signal of the lower limit of electric current, first switch pipe and devices so that inductive current is risen again
Height, adjusts the switching frequency of on-off circuit by the switching signal of regulation first switch pipe and devices.
Execution step S103, when the period 1 being not up to for first scheduled time, then improves the upper and lower of instruction inductive current
Limit difference, and the higher limit according to instruction inductive current, lower limit adjust the switching frequency of on-off circuit with sampling inductive current.
In the present embodiment, when the period 1 being not up to for first scheduled time, judged result is sent, electric current bound is poor
Value adjusts circuit and adjusts electric current bound difference according to judged result, and utilizes adder or subtractor to obtain instruction inductive current
Higher limit and lower limit, switch tube driving circuit 30 obtained using the instruction higher limit of inductive current, lower limit and on-off circuit
The sampling inductive current for taking adjusts the switching signal of switching tube, improves the ON time of first switch pipe Continuity signal so that the
The cycle of the switching signal of one switching tube is elongated, switching frequency step-down, such that it is able to the period 1 and the of controlling switch circuit
One Preset Time is equal or its difference is controlled within the specific limits.
Specifically, sampling inductive current is compared with the higher limit of inductive current, lower limit is instructed, when sampling inductance
Electric current reaches the higher limit of instruction inductive current, and the switching signal of first switch pipe occurs saltus step so that inductive current is reduced, when
Sampling inductive current reaches the lower limit of instruction inductive current, and the switching signal of first switch pipe occurs saltus step so that inductance electricity
Stream gravity is newly raised, and adjusts the switching frequency of on-off circuit by the switching signal of regulation first switch pipe.
When the on-off circuit includes first switch pipe and devices, according to instruction inductive current higher limit,
Lower limit is included with the method for the switching frequency of sampling inductive current adjustment on-off circuit：Will sampling inductive current and instruction inductance
The higher limit of electric current, lower limit are compared, when sampling inductive current reaches the higher limit of instruction inductive current, first switch pipe
There is saltus step with the switching signal of devices so that inductive current is reduced, when sampling inductive current reaches instruction inductance
There is saltus step in the switching signal of the lower limit of electric current, first switch pipe and devices so that inductive current is risen again
Height, adjusts the switching frequency of on-off circuit by the switching signal of regulation first switch pipe and devices.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any those familiar with the art can readily occur in change in the technical scope that this utility model is disclosed
Or replace, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with the power
The protection domain that profit is required is defined.
Claims (7)
1. a kind of control circuit of on-off circuit, the on-off circuit include first switch pipe, and on-off circuit passes through described first
The conducting of switching tube converts input voltage into output voltage with driving load with shut-off, it is characterised in that the control circuit
Including：
Continuity signal timing circuit, obtains the switching signal of first switch pipe, begins to turn on beginning timing from first switch pipe, arrive
The second power tube of same cycle terminates conducting as the period 1, judges whether the period 1 reached for first scheduled time, defeated
Go out judged result；
Instruction inductive current adjustment circuit, obtains instruction inductive current from on-off circuit, according to sentencing for Continuity signal timing circuit
Disconnected result adjust instruction inductive current, when the period 1 is more than first scheduled time, then reduces the upper and lower of instruction inductive current
Limit difference；When the period 1 being not up to for first scheduled time, then improve the bound difference of instruction inductive current；
Switch tube driving circuit, obtains sampling inductive current from on-off circuit, the higher limit, lower limit according to instruction inductive current
The switching frequency of on-off circuit is adjusted with sampling inductive current.
2. the control circuit of on-off circuit according to claim 1, it is characterised in that the Continuity signal timing circuit bag
Include timing circuit and voltage comparator circuit；
Wherein, the timing circuit begins to turn on beginning timing from the first switch pipe, to the second power tube of same cycle
When terminating conducting, timing voltage is exported；
The timing voltage is compared by the voltage comparator circuit with the first reference voltage, when timing voltage is more than the first reference
Voltage, then show when the period 1 is more than first scheduled time；When timing voltage is less than the first reference voltage, then show when first
Cycle was not up to for first scheduled time, exported judged result.
3. the control circuit of on-off circuit according to claim 1, it is characterised in that the instruction inductive current adjustment electricity
Road includes：Electric current bound difference adjusts circuit, rheonome, output voltage feedback circuit,
The feedback input end of output voltage feedback circuit is connected with the load outputs of on-off circuit, is obtained and on-off circuit
The corresponding instruction inductive current of inductive current higher limit or lower limit, and as instructing the of inductive current adjustment circuit
One outfan；
The electric current bound difference is adjusted the input of circuit and is connected with the outfan of Continuity signal timing circuit, by obtaining
The bound difference of the judged result regulating command inductive current of Continuity signal timing circuit；
Two inputs of rheonome outfan respectively with output voltage feedback circuit, electric current bound difference are adjusted
The outfan on economize on electricity road is connected, and the outfan of the rheonome is exported as the second of instruction inductive current adjustment circuit
End, using the corresponding lower limit of the rheonome regulating command inductive current or higher limit.
4. the control circuit of on-off circuit according to claim 3, it is characterised in that the rheonome is adder
Or subtractor, when the rheonome is adder, the output voltage feedback circuit obtains the inductance with on-off circuit
The lower limit of the corresponding instruction inductive current of electric current, using adder to instructing inductive current to be adjusted, obtains instruction electricity
The higher limit of inducing current；When the rheonome is subtractor, the output voltage feedback circuit is obtained and on-off circuit
Inductive current it is corresponding instruction inductive current higher limit, using subtractor to instruct inductive current be adjusted, obtain
The lower limit of instruction inductive current.
5. the control circuit of the on-off circuit according to claim 3 or 4, it is characterised in that the switch tube driving circuit
Be connected with instruction the first outfan of inductive current adjustment circuit, the second outfan, obtain the higher limit of instruction inductive current with
Lower limit, the switch tube driving circuit are also connected with on-off circuit, obtain the corresponding sampling electricity of inductive current of on-off circuit
Inducing current, the higher limit, lower limit and sampling inductive current according to instruction inductive current adjust the first switch pipe of on-off circuit
Switching signal.
6. the control circuit of on-off circuit according to claim 5, it is characterised in that will sampling inductive current and instruction electricity
The higher limit of inducing current, lower limit are compared, when sampling inductive current reaches the higher limit of instruction inductive current, first switch
There is saltus step in the switching signal of pipe so that inductive current is reduced, when sampling inductive current reaches the lower limit of instruction inductive current,
There is saltus step in the switching signal of first switch pipe so that inductive current is raised again, by adjusting the switch letter of first switch pipe
Number adjusting the switching frequency of on-off circuit.
7. a kind of switch circuit devices with the control circuit as described in claim 1～6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621011829.2U CN206041804U (en) | 2016-08-31 | 2016-08-31 | Switch circuit's control circuit and switch circuit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621011829.2U CN206041804U (en) | 2016-08-31 | 2016-08-31 | Switch circuit's control circuit and switch circuit device |
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| Publication Number | Publication Date |
|---|---|
| CN206041804U true CN206041804U (en) | 2017-03-22 |
Family
ID=58301146
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621011829.2U Active CN206041804U (en) | 2016-08-31 | 2016-08-31 | Switch circuit's control circuit and switch circuit device |
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| Country | Link |
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| CN (1) | CN206041804U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300972A (en) * | 2016-08-31 | 2017-01-04 | 杰华特微电子（张家港）有限公司 | The control method of a kind of on-off circuit, control circuit and switch circuit devices |
| CN107276412A (en) * | 2017-07-14 | 2017-10-20 | 杰华特微电子（杭州）有限公司 | A kind of control method of on-off circuit, control circuit and on-off circuit |
| CN109358688A (en) * | 2018-09-11 | 2019-02-19 | 意美旭智芯能源科技有限公司 | A kind of constant voltage output control method and circuit |
-
2016
- 2016-08-31 CN CN201621011829.2U patent/CN206041804U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300972A (en) * | 2016-08-31 | 2017-01-04 | 杰华特微电子（张家港）有限公司 | The control method of a kind of on-off circuit, control circuit and switch circuit devices |
| CN107276412A (en) * | 2017-07-14 | 2017-10-20 | 杰华特微电子（杭州）有限公司 | A kind of control method of on-off circuit, control circuit and on-off circuit |
| CN107276412B (en) * | 2017-07-14 | 2023-10-27 | 杰华特微电子股份有限公司 | Control method and control circuit of switching circuit and switching circuit |
| CN109358688A (en) * | 2018-09-11 | 2019-02-19 | 意美旭智芯能源科技有限公司 | A kind of constant voltage output control method and circuit |
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