CN105553259B - self-powered control circuit, control method and switching circuit - Google Patents
self-powered control circuit, control method and switching circuit Download PDFInfo
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- CN105553259B CN105553259B CN201610059690.7A CN201610059690A CN105553259B CN 105553259 B CN105553259 B CN 105553259B CN 201610059690 A CN201610059690 A CN 201610059690A CN 105553259 B CN105553259 B CN 105553259B
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- charging capacitor
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- 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
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- Dc-Dc Converters (AREA)
Abstract
A kind of self-powered control circuit of present invention offer, control method and switching circuit, self-powered control circuit is connected with switch main circuit, circuit provides the self-powered circuit of operating voltage including control circuit and in order to control, and self-powered circuit includes charging capacitor, first switch pipe, second switch pipe and current supply circuit.Charging capacitor is connected with switch main circuit and control circuit respectively, and circuit provides operating voltage to the voltage on charging capacitor in order to control.First switch pipe and second switch pipe are sequentially connected in series on switch main circuit, and the control pole of second switch pipe connects control circuit, receives the control signal from control circuit.Current supply circuit is connected with first switch pipe and charging capacitor.In a controlling cycle, charging capacitor is powered for first switch pipe, and first switch pipe is first connected, and switch main circuit charges through first switch pipe and current supply circuit for charging capacitor, and second switch pipe is connected after charging.
Description
Technical field
The present invention relates to switch control fields, and more particularly to a kind of self-powered control circuit, control method and switch are electric
Road.
Background technology
In traditional control circuit method of supplying power to, one is directly give control circuit power supply, such as line using independent power supply
Property power supply (LDO) or low power Switching Power Supply.These independent power supplys convert input voltage into required for control circuit
Power supply, typically cost is higher or inefficiency (the especially method of linear power supply method power supply).Another method is profit
With the magnetic cell in Switching Power Supply itself, generates a suitable output by auxiliary winding using electromagnetic coupling and give control electricity
Road powers, this method relative efficiency is higher, cost is relatively low, but increases the complexity of magnetic cell processing, and supply voltage is usual
It is influenced, is changed greatly, quality is not high by output voltage and load.
It is briefly explained by taking Buck circuit (reduction voltage circuit) of the switching tube shown in FIG. 1 in low side (Low Side) as an example
Realize that control circuit is powered this prior art using electromagnetic coupling.Before control circuit starts startup, the electric current very little of consumption,
Usually control circuit can be given with a start-up resistor (Rstart shown in Fig. 1) or high-voltage current source (smaller electric current)
Capacitance C on energization pins VCCVCCCharging.In order to reduce loss, usual start-up resistor is larger.As capacitance CVCCThe voltage at both ends
After (i.e. supply voltage) reaches startup voltage, control circuit is started to work, and output gate pole controls signal PWM driving switch pipe Q1,
Buck circuits also begin to work, input to load and provide energy.After work, the electric current of consumption can increase control circuit, larger
Start-up resistor cannot provide control circuit normal work when electric current, it is therefore desirable to capacitance CvccThe energy support control of middle storage
Circuit processed works on.Before supply voltage drops to the voltage that control circuit cannot be maintained to work normally, it is necessary to have other ways
Diameter gives control circuit continued power, maintains its normal work.The auxiliary winding Na coupled with inductance Lo is utilized in example shown in Fig. 1
Generate the supply voltage of control circuit, it is therefore desirable to additionally increase an auxiliary winding Na, structure is relative complex.And in reality
It in circuit, cannot be coupled completely between auxiliary winding Na and inductance Lo, cause the output voltage Va of auxiliary winding with load
Variation has variation, so that the supply voltage of control circuit is unstable.
Invention content
The present invention carries to overcome the problems, such as that existing control circuit method of supplying power to is complicated, of high cost and efficiency is low
Self-powered control circuit simple, small and at low cost, control method and switching circuit for a kind of circuit structure.
To achieve the goals above, the present invention provides a kind of self-powered control circuit being connected with switch main circuit, from
Power-supplying circuit includes control circuit and circuit provides the self-powered circuit of operating voltage in order to control, and self-powered circuit includes filling
Capacitance, first switch pipe, second switch pipe and current supply circuit.Charging capacitor is connected with switch main circuit and control circuit respectively
It connects, circuit provides operating voltage to the voltage on charging capacitor in order to control.First switch pipe and second switch pipe, which are sequentially connected in series, to be opened
It closes on main circuit, the control pole of second switch pipe connects control circuit, receives the control signal from control circuit.Current supply circuit
It is connected with first switch pipe and charging capacitor.In a controlling cycle, charging capacitor is powered for first switch pipe, and first opens
It closes pipe to be first connected, switch main circuit charges through first switch pipe and current supply circuit for charging capacitor, second switch after charging
Pipe is connected.
In one embodiment of the invention, current supply circuit includes third switching tube, diode and the 4th switching tube.Third switchs
Pipe is connected between charging capacitor and the control pole of first switch pipe.Diode is connected to first switch pipe and second switch pipe
Between common end and charging capacitor.4th switching tube is connected between first switch pipe and the common end and ground of second switch pipe.
In the first stage of a controlling cycle, the conducting of the 4th switching tube, the shutdown of second switch pipe, the shutdown of third switching tube, charging electricity
Hold, form the control that a charge pump loop is first switch pipe between the parasitic body diode of third switching tube and the 4th switching tube
Pole processed provides voltage, the conducting of first switch pipe；In second stage, second switch pipe and the shutdown of the 4th switching tube, switch main circuit
It charges for charging capacitor through first switch pipe and diode；Phase III, after charging, the conducting of second switch pipe；Fourth order
Section, the control signal shutdown second switch pipe of control circuit output, the conducting before second switch pipe turns off of third switching tube, first
Switching tube gate source voltage less than its open threshold value after turn off.
In one embodiment of the invention, current supply circuit includes third switching tube, the 5th switching tube and the 4th switching tube.Third
Switching tube is connected between charging capacitor and the control pole of first switch pipe.5th switching tube is connected to first switch pipe and second
Between the common end and charging capacitor of switching tube.4th switching tube be connected to first switch pipe and second switch pipe common end and
Between ground.In the first stage of a controlling cycle, the conducting of the 4th switching tube, the shutdown of second switch pipe, the shutdown of third switching tube,
5th switching tube turns off, and a charge is formed between charging capacitor, the parasitic body diode of third switching tube and the 4th switching tube
Pump loop provides voltage, the conducting of first switch pipe for the control pole of first switch pipe；In second stage, the 5th switching tube is connected,
Second switch pipe and the shutdown of the 4th switching tube, switch main circuit charge through first switch pipe and the 5th switching tube for charging capacitor；
Phase III, after charging, the shutdown of the 5th switching tube, the conducting of second switch pipe, the 5th switching tube is in the conducting of second switch pipe
Preceding shutdown；The control signal of fourth stage, control circuit output turns off second switch pipe, and third switching tube is closed in second switch pipe
Conducting before disconnected, first switch pipe gate source voltage less than its open threshold value after turn off.
In one embodiment of the invention, the conducting before second switch pipe turns off of third switching tube.
A kind of switching circuit is also provided in another aspect of the present invention, including switch main circuit and described above is led with switch
The self-powered control circuit that circuit is connected.
In one embodiment of the invention, switch main circuit is in buck circuits, buck-boost circuits or flyback circuits
It is any.
In another aspect of the present invention, also provide a kind of control method of self-powered control circuit, self-powered control circuit with
Switch main circuit is connected, and self-powered control circuit includes control circuit and circuit provides the self-powered electricity of operating voltage in order to control
Road, self-powered circuit include being connected charging capacitor, current supply circuit and to be sequentially connected in series with switch main circuit and control circuit
The first switch pipe and second switch pipe, control method of switch main circuit include：
Within the first stage of a controlling cycle, charging capacitor provides turning-on voltage, first switch for first switch pipe
Pipe is connected；
In the second stage of a controlling cycle, switch main circuit is filled through first switch pipe and current supply circuit for charging capacitor
Electricity；
In the phase III of a controlling cycle, second switch pipe is connected after charging, and switch main circuit is opened through first
Close pipe and second switch pipe forming circuit；
In the fourth stage of a controlling cycle, control circuit turns off first switch pipe and second switch pipe.
In conclusion self-powered control circuit provided by the invention, control method and switching circuit are compared with prior art,
It has the following advantages：
By the way that the charging capacitor, first switch pipe and the second switch pipe that are connected with switch main circuit is arranged and is opened first
It closes and current supply circuit is set between charging capacitor.In the starting stage of a controlling cycle, charging capacitor is that first switch pipe carries
For cut-in voltage, first switch conducting.After first switch pipe is connected, switch main circuit is through first switch pipe and current supply circuit
Charging capacitor charges, and realizes self-powered.At this point, the starting stage in a controlling cycle and the shutdown of second switch pipe, switch
Electric current in main circuit is smaller, and the loss of charge circuit can be reduced by being charged to charging capacitor using the smaller electric current,
Charge loss is greatly reduced while realizing self-powered and the switch stress of diode or the 5th switching tube is smaller, very
It is easy to implement.Self-powered control circuit provided by the invention is only merely to increase by body between charging capacitor and first switch pipe
The current supply circuit that the smaller element of product is formed, circuit structure is simple, and circuit cost is low, and is advantageously integrated, and substantially reduces control
The volume of circuit processed.
For above and other objects of the present invention, feature and advantage can be clearer and more comprehensible, preferred embodiment cited below particularly,
And coordinate attached drawing, it is described in detail below.
Description of the drawings
Fig. 1 show the circuit theory for realizing control circuit power supply in existing switching circuit by way of electromagnetic coupling
Figure.
Fig. 2 show the schematic diagram of the self-powered control circuit of the offer of the embodiment of the present invention one.
Fig. 3 show the sequence diagram on each element in Fig. 2.
Fig. 4 show the schematic diagram of the switching circuit of the offer of the embodiment of the present invention one.
Fig. 5 show the flow chart that the present invention implements the control method for the self-powered control circuit that one provides.
Fig. 6 show the schematic diagram of self-powered control circuit provided by Embodiment 2 of the present invention.
Fig. 7 show the sequence diagram on each element in Fig. 6.
Fig. 8 show the schematic diagram of switching circuit provided by Embodiment 2 of the present invention.
The drive signal that Fig. 9 show each switching tube in Fig. 6 generates schematic diagram.
Specific implementation mode
Embodiment one
As shown in Fig. 2, the present embodiment provides a kind of self-powered control circuit 200 being connected with switch main circuit 100, from
Power-supplying circuit 200 includes control circuit 1 and circuit 1 provides the self-powered circuit 2 of operating voltage, self-powered circuit in order to control
2 include charging capacitor CVCC, first switch pipe Q1, second switch pipe Q2 and current supply circuit 21.Charging capacitor CVCCRespectively with switch
Main circuit 100 is connected with control circuit 1, charging capacitor CVCCOn voltage in order to control circuit 1 provide operating voltage.First opens
Pipe Q1 and second switch pipe Q2 is closed to be sequentially connected in series on switch main circuit 100.The control pole connection control electricity of second switch pipe Q2
Road 1 receives the control signal from control circuit 1.Current supply circuit 21 and first switch pipe Q1 and charging capacitor CVCCIt is connected.
In a controlling cycle, charging capacitor CVCCIt powers for first switch pipe Q1, first switch pipe Q1 is first connected, switch main circuit
100 through first switch pipe Q1 and current supply circuit 21 be charging capacitor CVCCCharging, second switch pipe Q2 is connected after charging.
Self-powered control circuit provided in this embodiment passes through charging capacitor C in a controlling cycleVCCAllow first switch
Pipe Q1 is first connected and the Q2 delays of second switch pipe are connected after a certain period of time, and switch main circuit 100 is through first switch pipe Q1 and power supply
Realize charging capacitor C in circuit 21VCCIt is self-powered so that charging capacitor CVCCCircuit 1 in order to control that the voltage at both ends can be stablized
Operating voltage is provided.Further, due to the starting stage in a controlling cycle, the electric current of switch main circuit 100 is smaller, profit
It is charging capacitor C with the smaller electric currentVCC, virtual value is small, correspondingly, the loss on charge circuit is also smaller, greatly reduces
The loss of circuit.
In this present embodiment, current supply circuit 21 includes third switching tube Q3, diode D1 and the 4th switching tube Q4.Third is opened
It closes pipe Q3 and is connected to charging capacitor CVCCBetween the control pole of first switch pipe Q1.Diode D1 is connected to first switch pipe Q1
Common end with second switch pipe Q2 and charging capacitor CVCCBetween.4th switching tube Q4 is connected to first switch pipe Q1 and second
Between the common end and ground of switching tube Q2.Specific confession electric process is as follows：
Sequence diagram as shown in Figure 3, wherein VGS_Q1, VGS_Q2, VGS_Q3, VGS_Q4 are respectively to switch first switch
Pipe Q1, second switch pipe Q2, the gate drive voltage of third switching tube Q3 and the 4th switching tube Q4.ID1 is on diode D1
Electric current, Vcc_limit are charging capacitor CVCCOn charging upper limit threshold value, Vds_Q2 be second switch pipe Q2 drain-source voltage, IL
For the electric current on inductance in switch main circuit.
In first stage t1~t2 of a controlling cycle, the 4th switching tube Q4 conductings, the Q2 shutdowns of second switch pipe, third
Switching tube Q3 shutdowns, charging capacitor CVCC, third switching tube Q3 parasitic body diode and the 4th switching tube Q4 between formed one
Charge pump loop provides voltage, the Q1 conductings of first switch pipe for the control pole of first switch pipe Q1.The conducting of 4th switching tube Q4
Time can be that a fixed delay time either waits the drain-source voltage of first switches pipe Q1 less than threshold voltage or waits the
The gate source voltage of one switching tube Q1 can turn off the 4th switching tube Q4 higher than threshold voltage.
In second stage t2~t3, second switch pipe Q2 and the 4th switching tube Q4 shutdowns, switch main circuit 100 is through conducting
First switch pipe Q1 and diode D1 is charging capacitor CVCCCharging.
Phase III t3~t4, charging terminate, second switch pipe Q2 conducting, first the opening through conducting of switch main circuit 100
Pipe Q1 and second switch pipe Q2 forming circuits are closed, is load supplying.
Fourth stage t4~t5, a controlling cycle terminate, and the control signal that control circuit 1 exports turns off second switch pipe
Q2, third switching tube the Q3 conducting before the Q2 shutdowns of second switch pipe, the drain-source voltage of second switch pipe Q2 are charged by inductive current
And be lifted, when the drain-source voltage of second switch pipe Q2 reaches Vcc-Vth1 (Vth1 is the threshold voltage of first switch pipe Q1),
The gate-source voltage of first switch pipe Q1 opens threshold value, the Q1 shutdowns of first switch pipe less than it, and inductive current is begun to decline.
In this present embodiment, first switch pipe Q1, second switch pipe Q2, third switch Q3 and the 4th switching tube Q4 are
Mos is managed.However, the present invention is not limited in any way this.In other embodiments, first switch pipe Q1, second switch pipe Q2, the
Three switch Q3 and the 4th switching tube Q4 can be the full-control types semiconductor devices such as triode or IGBT.As shown in Fig. 2, first switch pipe
The drain series of the source electrode and second switch pipe Q2 of Q1.
It is corresponding, as shown in figure 4, the present embodiment also provides a kind of switching circuit.The switching circuit include it is above-mentioned from
Power-supplying circuit 200 and switch main circuit 100, switch main circuit 100 are connected with self-powered control circuit 200.Yu Benshi
It applies in example, switch main circuit 100 is buck circuits.However, the present invention is not limited in any way this.In other embodiments, open
It can be any one of buck-boost circuits or flyback circuits to close main circuit 100.
Corresponding with above-mentioned self-powered control circuit, the present invention also provides a kind of controlling parties of self-powered control circuit
Method, self-powered control circuit 200 are connected with switch main circuit 100, and self-powered control circuit 200 includes control circuit 1 and is
Control circuit 1 provides the self-powered circuit 2 of operating voltage, and self-powered circuit 2 includes and switch main circuit 100 and control circuit 1
Be connected charging capacitor CVCC, current supply circuit 21 and be sequentially connected in series first switch pipe Q1 and second switch in switch main circuit
Pipe Q2, as shown in figure 5, control method includes：
Step S1, in first stage t1~t2 of a controlling cycle, charging capacitor CVCCIt is provided out for first switch pipe Q1
Be powered pressure, the Q1 conductings of first switch pipe.In this present embodiment, charging capacitor CVCC, third switching tube Q3 parasitic body diode and
A charge pump loop is formed between 4th switching tube Q2 to provide voltage for the control pole of first switch pipe Q1 and make first switch
Pipe Q1 conductings.
Step S2, in second stage t2~t3 of a controlling cycle, switch main circuit 100 is through first switch pipe Q1 and confession
Electrical circuit 21 is charging capacitor CVCCCharging.In this present embodiment, current supply circuit 21 is by third switching tube Q3, diode D1 and
Four switching tube Q4 compositions.
Step S3, in phase III t3~t4 of a controlling cycle, second switch pipe Q2 is connected after charging, switch
Main circuit 100 is through first switch pipe Q1 and second switch pipe Q2 forming circuits, for load R power supplies.
Step S4, in fourth stage t4~t5 of a controlling cycle, control circuit 100 turns off first switch pipe Q1 and the
Two switching tube Q2.Specifically, at the end of the high level stage for the PWM gate poles control signal that control circuit 100 exports, second opens
Close pipe Q2 shutdowns.When the drain-source voltage of second switch pipe Q2 is lifted to Vcc-Vth1 and the Q3 conductings of third switching tube, first opens
The gate source voltage for closing pipe Q1 opens threshold value, the Q1 shutdowns of first switch pipe less than it.In this present embodiment, third switching tube Q3 is
Conducting before two switching tube Q2 shutdowns.
Self-powered control circuit provided by the invention and control method are to be based on a PWM controlling cycle.However, not limiting
Determine charging capacitor CVCCIt is intended to charge in each PWM controlling cycles.In actual use, as charging capacitor CVCCBoth end voltage is small
Self-powered control circuit is to charging capacitor C when charging upper limit threshold value Vcc_limitVCCCharging.It therefore, can be by adjusting second
Whether the driving voltage of switching tube Q2 is realized to charging capacitor CVCCCharging.Specifically, when needing to charging capacitor CVCCIt fills
When electric, exporting to the pwm control signal of second switch pipe Q2 after certain time-delay is connected again second switch pipe Q2；And works as and be not necessarily to
To charging capacitor CVCCWhen charging, the turn-on time of second switch pipe Q2 is consistent with pwm control signal, i.e., at the beginning of the period
Stage beginning t1~t2, first switch pipe Q1 and second switch pipe Q2 are simultaneously turned on.
Embodiment two
The present embodiment and embodiment one and its variation are essentially identical, difference lies in：As shown in fig. 6, by a kind of confession of embodiment
Diode D1 in electrical circuit 21 replaces with the 5th switching tube Q5 in the present embodiment, which can further decrease charging damage
Consumption.
In this present embodiment, current supply circuit 21 includes third switching tube Q3, the 5th switching tube Q5 and the 4th switching tube Q4.The
Three switching tube Q3 are connected to charging capacitor CVCCBetween the control pole of first switch pipe Q1.5th switching tube Q5 is connected to first
The common end of switching tube Q1 and second switch pipe Q2 and charging capacitor CVCCBetween.4th switching tube Q4 is connected to first switch pipe
Between Q1 and the common end and ground of second switch pipe Q2.
Fig. 7 show the sequence diagram of each element in self-powered control circuit provided in this embodiment.VGS_Q1,VGS_Q2,
VGS_Q3, VGS_Q4, VGS_Q5 are respectively to switch first switch pipe Q1, second switch pipe Q2, third switch Q3, the 4th switching tube
The gate drive voltage of Q4 and the 5th switching tube Q5.Vcc_limit is charging capacitor CVCCOn charging upper limit threshold value, Vds_Q2
For the drain-source voltage of second switch pipe Q2, IL is the electric current on inductance in switch main circuit.MN is the electricity of MN output ends in Fig. 8
Pressure.
In first stage t1~t2 of a controlling cycle, the 4th switching tube Q4 conductings, the Q2 shutdowns of second switch pipe, third
Switching tube Q3 shutdowns, the 5th switching tube Q5 shutdowns, charging capacitor CVCC, third switching tube Q3 parasitic body diode and the 4th open
One charge pump loop of formation provides voltage, the Q1 conductings of first switch pipe for the control pole of first switch pipe Q1 between closing pipe Q4.
In second stage t2~t3, the 5th switching tube Q5 conductings, second switch pipe Q2 and the 4th switching tube Q4 shutdowns, switch
Main circuit 100 charges through first switch pipe Q1 and the 5th switching tube Q5 for charging capacitor, realizes self-powered.
Phase III t3~t4, after charging, the 5th switching tube Q5 shutdowns, the Q2 conductings of second switch pipe, and the 5th opens
Pipe Q5 shutdowns before the Q2 conductings of second switch pipe are closed, prevent capacitance Cvcc from being discharged by Q2.Switch main circuit 100 through conducting first
Switching tube Q1 and second switch pipe Q2 forming circuits, are load supplying.
Fourth stage t4~t5, the control signal that control circuit 100 exports turn off second switch pipe Q2, third switching tube Q3
The conducting before second switch pipe Q2 shutdown, first switch pipe Q1 less than its open threshold value after turn off.
Corresponding, the present embodiment also provides a kind of switching circuit, as shown in Figure 8.Switching circuit includes that the present embodiment carries
The self-powered control circuit 200 and switch main circuit 100 of confession.In this present embodiment, switch main circuit is buck circuits.However,
The present invention is not limited in any way this.In other embodiments, switch main circuit 100 can be buck-boost circuits or
Any one of flyback circuits.
Identical as embodiment one, self-powered control circuit provided in this embodiment and control method are controlled based on a PWM
Period processed.However, and non-limiting charging capacitor CVCCIt is intended to charge in each PWM controlling cycles.A kind of production is given in Fig. 9
The circuit diagram of the gate drive voltage of raw second switch pipe Q2, third switching tube Q3, the 4th switching tube Q4 and the 5th switching tube Q5.
In fig. 8, by MN signals and PWM gate poles control signal phase and to realize charging capacitor CVCCSelective recharging.
In fig.9, first comparator CMP1 is a hysteresis comparator, as charging capacitor CVCCVoltage vcc be less than the limit
When voltage vcc _ limit, the output negative terminal EN_CHR outputs 1 of first comparator CMP1.Pwm signal is with EN_CHR signals through first
The 4th switching tube Q4 drive signal VGS_Q4 are generated with the single-shot trigger circuit by an one-shot after door U1, the 4th opens
Pipe Q4 conductings are closed, the grid that charge pump loop is first switch pipe Q1 is formed and powers, the Q1 conductings of first switch pipe.When the 4th switch
At the end of pipe Q4 drivings, by a reverse swing door, the failing edge of VGS_Q4 triggers the first rest-set flip-flop U2, it is made to set 1 (i.e. VGS_
Q5 signals are that 1), the 5th switching tube Q5 conductings, switch main circuit is charging capacitor through first switch pipe Q1 and the 5th switching tube Q5
CVCCCharging.
As charging capacitor CVCCWhen voltage is higher than Vcc_limit, comparator CMP1 outputs 1, or reach the 5th of setting and open
Close the charging current peak C urrent of the maximum turn-on time Ton max of Q5 or the 5th switching tube Q5 of pipe Q5
(judged by the second comparator CMP2) when sense of Q5 reach limit value CS_limit or door U3 output signals 1 are by
One rest-set flip-flop U2 resets, and VGS_Q5 signals are 0, the 5th switching tube Q5 shutdowns, to charging capacitor CVCCCharging terminates.
MN signals are generated by the second rest-set flip-flop U4, the reverse signal of the second rest-set flip-flop of VGS_Q4 set U4, VGS_Q5
VGS_Q5N resets the second rest-set flip-flop U4.MN signals and PWM believe with door U5 phases with the driving for generating second switch pipe Q2 through second
Number VGS_Q2.Specifically, working as charging capacitor CVCCVoltage be less than Vcc_limit when, EN_CHR 1, when pwm signal be height
When level, it is 0 that VGS_Q4 1 set the second rest-set flip-flop U4, MN signals of output, which are 0, VGS_Q2 signals, and second switch pipe Q2 is closed
Disconnected, switch main circuit is through current supply circuit to charging capacitor CVCCCharging.When VGS_Q4 is 0, the failing edge of VGS_Q5N signals is multiple
The second rest-set flip-flop U4, MN signal of position is that 1, VGS_Q2 signals are controlled by PWM.And work as charging capacitor CVCCVoltage be more than or wait
When limiting voltage Vcc_limit, EN_CHR 0, VGS_Q4 0, VGS_Q5 1, MN signals are 1, at this time VGS_Q2 and PWM
Signal synchronizes, and second switch pipe Q2 is turned in the starting stage of pwm signal, charging capacitor CVCCIt does not charge.VGS_Q3 is by third
Rest-set flip-flop U5 is generated, and pwm signal is resetted by the reverse signal of rising edge delay circuit set third rest-set flip-flop U5, PWM
Third rest-set flip-flop U5.
In conclusion by the way that the charging capacitor, first switch pipe and the second switch pipe that are connected with switch main circuit is arranged
And current supply circuit is set between first switch and charging capacitor.In the starting stage of a cycle, charging capacitor is opened for first
It closes pipe and cut-in voltage, first switch conducting is provided.After first switch pipe is connected, switch main circuit is through first switch pipe and power supply
Circuit is charged for charging capacitor, is realized self-powered.At this point, the starting stage in a cycle and the shutdown of second switch pipe, are opened
The electric current closed in main circuit is smaller, and the loss of charge circuit can be reduced by being charged to charging capacitor using the smaller electric current,
Charge loss is greatly reduced while realizing self-powered and the switch stress of diode or the 5th switching tube is smaller, it is non-
It is often easy to implement.Self-powered control circuit provided by the invention be only merely between charging capacitor and first switch pipe increase by
The current supply circuit that the element of small volume is formed, circuit structure is simple, and circuit cost is low, and is advantageously integrated, and substantially reduces
The volume of control circuit.
Although the present invention is disclosed above by preferred embodiment, however, it is not intended to limit the invention, this any known skill
Skill person can make some changes and embellishment without departing from the spirit and scope of the present invention, therefore protection scope of the present invention is worked as
Subject to claims range claimed.
Claims (6)
1. a kind of self-powered control circuit, which is characterized in that be connected with switch main circuit, the self-powered control circuit includes
Control circuit and in order to control circuit provide the self-powered circuit of operating voltage, and the switch main circuit includes first be sequentially connected in series
The control pole of switching tube and second switch pipe, second switch pipe connects control circuit, receives the control signal from control circuit；
The self-powered circuit includes charging capacitor and current supply circuit, the charging capacitor respectively with switch main circuit and control circuit phase
It connects, circuit provides operating voltage to the voltage on charging capacitor in order to control；The current supply circuit includes third switching tube, diode
With the 4th switching tube, the third switching tube is connected between charging capacitor and the control pole of first switch pipe；The diode
It is connected between first switch pipe and the common end and charging capacitor of second switch pipe；4th switching tube is connected to first and opens
It closes between pipe and the common end and ground of second switch pipe；
In a controlling cycle, charging capacitor is the power supply of first switch pipe, and first switch pipe is first connected, and switch main circuit is through the
One switching tube and current supply circuit charge for charging capacitor, and second switch pipe is connected after charging；
In the first stage of a controlling cycle, the 4th switching tube conducting, second switch pipe turns off, and the shutdown of third switching tube is filled
It is first switch pipe that a charge pump loop is formed between capacitance, the parasitic body diode of third switching tube and the 4th switching tube
Control pole provide voltage, first switch pipe conducting；In second stage, second switch pipe and the shutdown of the 4th switching tube, switch master
Circuit charges through first switch pipe and diode for charging capacitor；Phase III, after charging, the conducting of second switch pipe；The
The control signal in four stages, control circuit output turns off second switch pipe, and third switching tube is connected before second switch pipe turns off,
First switch pipe gate source voltage less than its open threshold value after turn off.
2. a kind of self-powered control circuit, which is characterized in that be connected with switch main circuit, the self-powered control circuit includes
Control circuit and in order to control circuit provide the self-powered circuit of operating voltage, and the switch main circuit includes first be sequentially connected in series
The control pole of switching tube and second switch pipe, second switch pipe connects control circuit, receives the control signal from control circuit；
The self-powered circuit includes charging capacitor and current supply circuit, and the charging capacitor is electric with switch main circuit and control respectively
Road is connected, and circuit provides operating voltage to the voltage on charging capacitor in order to control；The current supply circuit includes third switching tube,
Five switching tubes and the 4th switching tube, the third switching tube are connected between charging capacitor and the control pole of first switch pipe；Institute
The 5th switching tube is stated to be connected between first switch pipe and the common end and charging capacitor of second switch pipe；4th switching tube
It is connected between first switch pipe and the common end and ground of second switch pipe；
In a controlling cycle, charging capacitor is the power supply of first switch pipe, and first switch pipe is first connected, and switch main circuit is through the
One switching tube and current supply circuit charge for charging capacitor, and second switch pipe is connected after charging；
In the first stage of a controlling cycle, the conducting of the 4th switching tube, the shutdown of second switch pipe, the shutdown of third switching tube, the
Five switching tubes turn off, and a charge pump is formed between charging capacitor, the parasitic body diode of third switching tube and the 4th switching tube
Circuit provides voltage, the conducting of first switch pipe for the control pole of first switch pipe；In second stage, the 5th switching tube is connected, the
Two switching tubes and the shutdown of the 4th switching tube, switch main circuit charge through first switch pipe and the 5th switching tube for charging capacitor；The
In three stages, after charging, the shutdown of the 5th switching tube, the conducting of second switch pipe, the 5th switching tube is before the conducting of second switch pipe
Shutdown；The control signal of fourth stage, control circuit output turns off second switch pipe, and third switching tube is turned off in second switch pipe
Preceding conducting, first switch pipe gate source voltage less than its open threshold value after turn off.
3. a kind of switching circuit, which is characterized in that including：
Switch main circuit is load supplying；
Claim 1~2 any one of them self-powered control circuit, is connected with the switch main circuit.
4. switching circuit according to claim 3, which is characterized in that the switch main circuit be buck circuits or
One kind in buckboost circuits.
5. a kind of control method of self-powered control circuit, which is characterized in that self-powered control circuit is connected with switch main circuit
It connects, self-powered control circuit includes control circuit and circuit provides the self-powered circuit of operating voltage, self-powered circuit in order to control
Including the charging capacitor and current supply circuit of being connected with switch main circuit and control circuit, the switch main circuit includes first switch
Pipe and second switch pipe, the control method include：
Within the first stage of a controlling cycle, charging capacitor provides turning-on voltage for first switch pipe, and first switch pipe is led
It is logical；
In the second stage of a controlling cycle, switch main circuit charges through first switch pipe and current supply circuit for charging capacitor；
In the phase III of a controlling cycle, second switch pipe is connected after charging, and switch main circuit is through first switch pipe
It is formed into a loop with second switch pipe；
In the fourth stage of a controlling cycle, control circuit turns off first switch pipe and second switch pipe；
The current supply circuit includes：Third switching tube is connected between charging capacitor and the control pole of first switch pipe；
Diode is connected between first switch pipe and the common end and charging capacitor of second switch pipe；
4th switching tube is connected between first switch pipe and the common end and ground of second switch pipe；
In the first stage of a controlling cycle, the 4th switching tube conducting, second switch pipe turns off, and the shutdown of third switching tube is filled
A charge pump loop is formed between capacitance, the parasitic body diode of third switching tube and the 4th switching tube, is first switch
The control pole of pipe provides voltage, the conducting of first switch pipe；In second stage, second switch pipe and the shutdown of the 4th switching tube, switch
Main circuit charges through first switch pipe and diode for charging capacitor；Phase III, after charging, the conducting of second switch pipe；
The control signal of fourth stage, control circuit output turns off second switch pipe, and third switching tube is turned off in second switch pipe
Preceding conducting, first switch pipe gate source voltage less than its open threshold value after turn off.
6. a kind of control method of self-powered control circuit, which is characterized in that self-powered control circuit is connected with switch main circuit
It connects, self-powered control circuit includes control circuit and circuit provides the self-powered circuit of operating voltage, self-powered circuit in order to control
Including the charging capacitor and current supply circuit of being connected with switch main circuit and control circuit, the switch main circuit includes first switch
Pipe and second switch pipe, the control method include：
Within the first stage of a controlling cycle, charging capacitor provides turning-on voltage for first switch pipe, and first switch pipe is led
It is logical；
In the second stage of a controlling cycle, switch main circuit charges through first switch pipe and current supply circuit for charging capacitor；
In the phase III of a controlling cycle, second switch pipe is connected after charging, and switch main circuit is through first switch pipe
It is formed into a loop with second switch pipe；
In the fourth stage of a controlling cycle, control circuit turns off first switch pipe and second switch pipe；
The current supply circuit includes：
Third switching tube is connected between charging capacitor and the control pole of first switch pipe；
5th switching tube is connected between first switch pipe and the common end and charging capacitor of second switch pipe；
4th switching tube is connected between first switch pipe and the common end and ground of second switch pipe；
In the first stage of a controlling cycle, the conducting of the 4th switching tube, the shutdown of second switch pipe, the shutdown of third switching tube, the
Five switching tubes turn off, and a charge pump is formed between charging capacitor, the parasitic body diode of third switching tube and the 4th switching tube
Circuit provides voltage, the conducting of first switch pipe for the control pole of first switch pipe；In second stage, the 5th switching tube is connected, the
Two switching tubes and the shutdown of the 4th switching tube, switch main circuit charge through first switch pipe and the 5th switching tube for charging capacitor；The
In three stages, after charging, the shutdown of the 5th switching tube, the conducting of second switch pipe, the 5th switching tube is before the conducting of second switch pipe
Shutdown；The control signal of fourth stage, control circuit output turns off second switch pipe, and third switching tube is turned off in second switch pipe
Preceding conducting, first switch pipe gate source voltage less than its open threshold value after turn off.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610059690.7A CN105553259B (en) | 2016-01-28 | 2016-01-28 | self-powered control circuit, control method and switching circuit |
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| CN201610059690.7A CN105553259B (en) | 2016-01-28 | 2016-01-28 | self-powered control circuit, control method and switching circuit |
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| CN105553259B true CN105553259B (en) | 2018-11-13 |
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| CN107395012B (en) * | 2017-08-04 | 2023-05-16 | 杰华特微电子股份有限公司 | Charge pump circuit and control method thereof |
| CN107272807B (en) * | 2017-08-07 | 2019-07-09 | 矽力杰半导体技术(杭州)有限公司 | Self-powered source electrode drive circuit, source drive switch converters and integrated circuit |
| CN108667275A (en) * | 2018-06-11 | 2018-10-16 | 南阳理工学院 | A kind of power supply main circuit control method |
| CN113541444B (en) * | 2020-04-15 | 2023-03-24 | 成都中启易联科技有限公司 | Current recovery circuit, switch converter and integrated circuit |
| CN114567152B (en) * | 2022-03-11 | 2023-03-21 | 苏州力生美半导体有限公司 | Switching power supply chip and switching power supply circuit |
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|---|---|---|---|---|
| CN103825469A (en) * | 2014-03-06 | 2014-05-28 | 矽力杰半导体技术(杭州)有限公司 | Control circuit for isolated type convertor and isolated type convertor |
| CN104410252A (en) * | 2014-12-11 | 2015-03-11 | 矽力杰半导体技术(杭州)有限公司 | Source electrode drive circuit and controlling method thereof |
| CN205377665U (en) * | 2016-01-28 | 2016-07-06 | 杰华特微电子（杭州）有限公司 | From supply control circuit and switch circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7257008B2 (en) * | 2005-09-15 | 2007-08-14 | System-General Corporation | Start-up apparatus for power converters |
| CN104836421B (en) * | 2015-05-19 | 2017-12-05 | 矽力杰半导体技术(杭州)有限公司 | The power supply circuit and method of supplying power to of a kind of Switching Power Supply |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825469A (en) * | 2014-03-06 | 2014-05-28 | 矽力杰半导体技术(杭州)有限公司 | Control circuit for isolated type convertor and isolated type convertor |
| CN104410252A (en) * | 2014-12-11 | 2015-03-11 | 矽力杰半导体技术(杭州)有限公司 | Source electrode drive circuit and controlling method thereof |
| CN205377665U (en) * | 2016-01-28 | 2016-07-06 | 杰华特微电子（杭州）有限公司 | From supply control circuit and switch circuit |
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