CN105553259A - Self power supply control circuit, control method and switching circuit - Google Patents
Self power supply control circuit, control method and switching circuit Download PDFInfo
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- CN105553259A CN105553259A CN201610059690.7A CN201610059690A CN105553259A CN 105553259 A CN105553259 A CN 105553259A CN 201610059690 A CN201610059690 A CN 201610059690A CN 105553259 A CN105553259 A CN 105553259A
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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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Abstract
The invention provides a self power supply control circuit, a control method and a switching circuit. The self power supply control circuit is connected with a switching main circuit and comprises a control circuit and a self power supply circuit, wherein the self power supply circuit is used for providing a working voltage for the control circuit and comprises a charging capacitor, a first switching tube, a second switching tube and a power supply loop, the charging capacitor is connected with the switching main circuit and the control circuit, the voltage on the charging capacitor is used for providing the working voltage for the control circuit, the first switching tube and the second switching tube are sequentially connected in series onto the switching main circuit, a control electrode of the second switching tube is connected with the control circuit and used for receiving a control signal from the control circuit, and the power supply loop is connected with the first switching tube and the charging capacitor. In a control period, the charging capacitor supplies power to the first switching tube, the first switching tube is firstly conducted, the switching main circuit charges the charging capacitor through the first switching tube and the power supply loop, and then the second switching tube is conducted after completion of charging.
Description
Technical field
The present invention relates to switch control rule field, and in particular to a kind of self-powered control circuit, control method and switching circuit.
Background technology
In traditional control circuit method of supplying power to, one directly adopts independently power supply to power to control circuit, as linear power supply (LDO) or low power Switching Power Supply.These independently power supply input voltage is converted to the power supply required for control circuit, the higher or inefficiency of usual cost (particularly linear power supply method power method).Another kind method utilizes the magnetic cell in Switching Power Supply self, utilize electromagnetic coupled, by auxiliary winding, produce a suitable control circuit of exporting to power, this method relative efficiency is higher, cost is lower, but adds the complexity of magnetic cell processing, and supply power voltage is subject to the impact of output voltage and load usually, change greatly, quality is not high.
Utilize electromagnetic coupled to realize control circuit for the switching tube of shown in Fig. 1 at Buck circuit (reduction voltage circuit) brief description of low side (LowSide) to power this prior art.Before control circuit starts to start, the electric current of consumption is very little, usually can by a starting resistance (Rstart shown in Fig. 1) or high-voltage current source (less electric current) to the electric capacity C on control circuit energization pins VCC
vCCcharging.In order to reduce the wastage, usual starting resistance is larger.As electric capacity C
vCCafter the voltage (i.e. supply power voltage) at two ends reaches starting resistor, control circuit is started working, and export gate pole control signal PWM driving switch pipe Q1, Buck circuit is also started working, and inputs and provides energy to load.Control circuit is after work, and the electric current of consumption can increase, and electric current when larger starting resistance can not provide control circuit normally to work, therefore needs electric capacity C
vccthe energy support and control circuit of middle storage works on.Before supply power voltage drops to and can not maintain voltage that control circuit normally works, other approach must be had to control circuit continued power, maintain it and normally work.Utilize the auxiliary winding Na be coupled with inductance L o to produce the supply power voltage of control circuit in example shown in Fig. 1, therefore need additionally to increase an auxiliary winding Na, structure relative complex.And in side circuit, auxiliary winding Na can not be coupled completely with between inductance L o, cause the output voltage Va of auxiliary winding to have variation along with the change of load, thus make the supply power voltage of control circuit unstable.
Summary of the invention
The present invention, in order to overcome the high and inefficient problem of existing control circuit method of supplying power to complex structure, cost, provides that a kind of circuit structure is simple, volume is little and self-powered control circuit, control method and switching circuit that cost is low.
To achieve these goals, the invention provides a kind of self-powered control circuit be connected with switch main circuit, self-powered control circuit comprises control circuit and provides the self-powered circuit of operating voltage for control circuit, and self-powered circuit comprises charging capacitor, the first switching tube, second switch pipe and current supply circuit.Charging capacitor is connected with control circuit with switch main circuit respectively, and the voltage on charging capacitor provides operating voltage for control circuit.First switching tube and second switch pipe are connected on switch main circuit successively, and the control pole connection control circuit of second switch pipe, receives the control signal from control circuit.Current supply circuit is connected with charging capacitor with the first switching tube.In a control cycle, charging capacitor is that the first switching tube is powered, and the first conducting of the first switching tube, switch main circuit is charging capacitor charging through the first switching tube and current supply circuit, and charging terminates the conducting of rear second switch pipe.
In one embodiment of the invention, current supply circuit comprises the 3rd switching tube, diode and the 4th switching tube.3rd switching tube is connected between the control pole of charging capacitor and the first switching tube.Between the common port that diode is connected to the first switching tube and second switch pipe and charging capacitor.Between the common port that 4th switching tube is connected to the first switching tube and second switch pipe and ground.In the first stage of a control cycle, 4th switching tube conducting, second switch pipe turns off, 3rd switching tube turns off, form the control pole that a charge pump loop is the first switching tube between the parasitic body diode of charging capacitor, the 3rd switching tube and the 4th switching tube and provide voltage, the first switching tube conducting; In second stage, second switch pipe and the 4th switching tube turn off, and switch main circuit is charging capacitor charging through the first switching tube and diode; Phase III, after charging terminates, the conducting of second switch pipe; Fourth stage, the control signal that control circuit exports turns off second switch pipe, and the conducting before second switch pipe turns off of the 3rd switching tube, the first switching tube gate source voltage turns off after opening threshold value lower than it.
In one embodiment of the invention, current supply circuit comprises the 3rd switching tube, the 5th switching tube and the 4th switching tube.3rd switching tube is connected between the control pole of charging capacitor and the first switching tube.Between the common port that 5th switching tube is connected to the first switching tube and second switch pipe and charging capacitor.Between the common port that 4th switching tube is connected to the first switching tube and second switch pipe and ground.In the first stage of a control cycle, 4th switching tube conducting, second switch pipe turns off, 3rd switching tube turns off, 5th switching tube turns off, form the control pole that a charge pump loop is the first switching tube between the parasitic body diode of charging capacitor, the 3rd switching tube and the 4th switching tube and provide voltage, the first switching tube conducting; In second stage, the 5th switching tube conducting, second switch pipe and the 4th switching tube turn off, and switch main circuit is charging capacitor charging through the first switching tube and the 5th switching tube; Phase III, after charging terminates, the 5th switching tube turns off, the conducting of second switch pipe, and the 5th switching tube turns off before the conducting of second switch pipe; Fourth stage, the control signal that control circuit exports turns off second switch pipe, and the conducting before second switch pipe turns off of the 3rd switching tube, the first switching tube gate source voltage turns off after opening threshold value lower than it.
In one embodiment of the invention, the conducting before second switch pipe turns off of the 3rd switching tube.
Also provide a kind of switching circuit on the other hand in the present invention, comprise switch main circuit and the described above self-powered control circuit be connected with switch main circuit.
In one embodiment of the invention, switch main circuit is any one in buck circuit, buck-boost circuit or flyback circuit.
In the present invention on the other hand, a kind of control method of self-powered control circuit is also provided, self-powered control circuit is connected with switch main circuit, self-powered control circuit comprises control circuit and provides the self-powered circuit of operating voltage for control circuit, self-powered circuit comprises and to be connected charging capacitor, current supply circuit with switch main circuit with control circuit and to be connected on the first switching tube and the second switch pipe of switch main circuit successively, and control method comprises:
Within the first stage of a control cycle, charging capacitor provides turning-on voltage, the first switching tube conducting for the first switching tube;
In the second stage of a control cycle, switch main circuit is charging capacitor charging through the first switching tube and current supply circuit;
In the phase III of a control cycle, charging terminates the conducting of rear second switch pipe, and switch main circuit forms loop through the first switching tube and second switch pipe;
In the fourth stage of a control cycle, control circuit turns off the first switching tube and second switch pipe.
In sum, self-powered control circuit provided by the invention, control method and switching circuit compared with prior art, have the following advantages:
The charging capacitor, the first switching tube and the second switch pipe that are connected with switch main circuit by setting also arrange current supply circuit between the first switch and charging capacitor.In the starting stage of a control cycle, charging capacitor provides cut-in voltage, the first switch conduction for the first switching tube.When after the first switching tube conducting, switch main circuit is charging capacitor charging through the first switching tube and current supply circuit, realizes self-powered.Now, in starting stage of a control cycle and second switch pipe turn off, electric current in switch main circuit is less, the electric current adopting this less carries out charging to charging capacitor and can reduce the loss of charge circuit, realize self-powered while greatly reduce charge loss and the switch stress of diode or the 5th switching tube is less, be very easy to realize.Self-powered control circuit provided by the invention only just increases the current supply circuit be made up of the element of small volume between charging capacitor and the first switching tube, and circuit structure is simple, and circuit cost is low, and facilitates integrated, substantially reduces the volume of control circuit.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate accompanying drawing, be described in detail below.
Accompanying drawing explanation
Figure 1 shows that in existing switching circuit and realize by the mode of electromagnetic coupled the circuit theory diagrams that control circuit powers.
Figure 2 shows that the schematic diagram of the self-powered control circuit that the embodiment of the present invention one provides.
Figure 3 shows that the sequential chart on each element in Fig. 2.
Figure 4 shows that the schematic diagram of the switching circuit that the embodiment of the present invention one provides.
Figure 5 shows that the flow chart of the control method of the self-powered control circuit that the invention process one provides.
Figure 6 shows that the schematic diagram of the self-powered control circuit that the embodiment of the present invention two provides.
Figure 7 shows that the sequential chart on each element in Fig. 6.
Figure 8 shows that the schematic diagram of the switching circuit that the embodiment of the present invention two provides.
Figure 9 shows that the drive singal of each switching tube in Fig. 6 produces schematic diagram.
Embodiment
Embodiment one
As shown in Figure 2, the present embodiment provides a kind of self-powered control circuit 200 be connected with switch main circuit 100, self-powered control circuit 200 comprises control circuit 1 and provides the self-powered circuit 2 of operating voltage for control circuit 1, and self-powered circuit 2 comprises charging capacitor C
vCC, the first switching tube Q1, second switch pipe Q2 and current supply circuit 21.Charging capacitor C
vCCbe connected with control circuit 1 with switch main circuit 100 respectively, charging capacitor C
vCCon voltage provide operating voltage for control circuit 1.First switching tube Q1 and second switch pipe Q2 is connected on switch main circuit 100 successively.The control pole connection control circuit 1 of second switch pipe Q2, receives the control signal from control circuit 1.Current supply circuit 21 and the first switching tube Q1 and charging capacitor C
vCCbe connected.In a control cycle, charging capacitor C
vCCbe that the first switching tube Q1 powers, the first conducting of the first switching tube Q1, switch main circuit 100 is charging capacitor C through the first switching tube Q1 and current supply circuit 21
vCCcharging, charging terminates rear second switch pipe Q2 conducting.
The self-powered control circuit that the present embodiment provides in a control cycle by charging capacitor C
vCCallow the first conducting of the first switching tube Q1 and conducting after second switch pipe Q2 time delay certain hour, switch main circuit 100 realizes charging capacitor C through the first switching tube Q1 and current supply circuit 21
vCCself-powered, make charging capacitor C
vCCthe voltage at two ends can be stable provide operating voltage for control circuit 1.Further, due to the starting stage at a control cycle, the electric current of switch main circuit 100 is less, and the electric current utilizing this less is charging capacitor C
vCC, effective value is little, and accordingly, the loss on charge circuit is also less, greatly reduces the loss of circuit.
In the present embodiment, current supply circuit 21 comprises the 3rd switching tube Q3, diode D1 and the 4th switching tube Q4.3rd switching tube Q3 is connected to charging capacitor C
vCCand first switching tube Q1 control pole between.Diode D1 is connected to common port and the charging capacitor C of the first switching tube Q1 and second switch pipe Q2
vCCbetween.Between the common port that 4th switching tube Q4 is connected to the first switching tube Q1 and second switch pipe Q2 and ground.Concrete self-powered process is as follows:
Sequential chart as shown in Figure 3, wherein, VGS_Q1, VGS_Q2, VGS_Q3, VGS_Q4 are respectively switch first switching tube Q1, second switch pipe Q2, the gate drive voltage of the 3rd switching tube Q3 and the 4th switching tube Q4.ID1 is the electric current on diode D1, and Vcc_limit is charging capacitor C
vCCon charging upper limit threshold value, Vds_Q2 is the drain-source voltage of second switch pipe Q2, and IL is the electric current in switch main circuit internal inductance.
At the first stage t1 ~ t2 of a control cycle, the 4th switching tube Q4 conducting, second switch pipe Q2 turns off, and the 3rd switching tube Q3 turns off, charging capacitor C
vCC, form a charge pump loop between the parasitic body diode of the 3rd switching tube Q3 and the 4th switching tube Q4 for the control pole of the first switching tube Q1 and provide voltage, the first switching tube Q1 conducting.The ON time of the 4th switching tube Q4 can be a fixing delay time or etc. the first switching tube Q1 drain-source voltage lower than threshold voltage or etc. the gate source voltage of the first switching tube Q1 just can turn off the 4th switching tube Q4 higher than threshold voltage.
At second stage t2 ~ t3, second switch pipe Q2 and the 4th switching tube Q4 turns off, and switch main circuit 100 is charging capacitor C through the first switching tube Q1 of conducting and diode D1
vCCcharging.
Phase III t3 ~ t4, charging terminates, second switch pipe Q2 conducting, and switch main circuit 100 forms loop through the first switching tube Q1 of conducting and second switch pipe Q2, is load supplying.
Fourth stage t4 ~ t5, a control cycle terminates, the control signal that control circuit 1 exports turns off second switch pipe Q2,3rd switching tube Q3 conducting before second switch pipe Q2 turns off, the drain-source voltage of second switch pipe Q2 is charged and lifting by inductive current, when the drain-source voltage of second switch pipe Q2 reaches Vcc-Vth1 (Vth1 is the threshold voltage of the first switching tube Q1), the gate-source voltage of the first switching tube Q1 opens threshold value lower than it, first switching tube Q1 turns off, and inductive current starts to decline.
In the present embodiment, the first switching tube Q1, second switch pipe Q2, the 3rd switch Q3 and the 4th switching tube Q4 is mos pipe.But the present invention is not limited in any way this.In other embodiment, the first switching tube Q1, second switch pipe Q2, the 3rd switch Q3 and the 4th switching tube Q4 can be the full-control type such as triode or IGBT semiconductor device.As shown in Figure 2, the source electrode of the first switching tube Q1 and the drain series of second switch pipe Q2.
Corresponding, as shown in Figure 4, the present embodiment also provides a kind of switching circuit.Described switching circuit comprises above-mentioned self-powered control circuit 200 and switch main circuit 100, and switch main circuit 100 is connected with self-powered control circuit 200.In the present embodiment, switch main circuit 100 is buck circuit.But the present invention is not limited in any way this.In other embodiment, switch main circuit 100 can be any one in buck-boost circuit or flyback circuit.
Corresponding with above-mentioned self-powered control circuit, the present invention also provides a kind of control method of self-powered control circuit, self-powered control circuit 200 is connected with switch main circuit 100, self-powered control circuit 200 comprises control circuit 1 and provides the self-powered circuit 2 of operating voltage for control circuit 1, and self-powered circuit 2 comprises the charging capacitor C that to be connected with control circuit 1 with switch main circuit 100
vCC, current supply circuit 21 and be connected on the first switching tube Q1 and the second switch pipe Q2 of switch main circuit successively, as shown in Figure 5, control method comprises:
Step S1, at the first stage t1 ~ t2 of a control cycle, charging capacitor C
vCCfor the first switching tube Q1 provides turning-on voltage, the first switching tube Q1 conducting.In the present embodiment, charging capacitor C
vCC, form the control pole that a charge pump loop is the first switching tube Q1 between the parasitic body diode of the 3rd switching tube Q3 and the 4th switching tube Q2 and provide voltage to make the first switching tube Q1 conducting.
Step S2, at the second stage t2 ~ t3 of a control cycle, switch main circuit 100 is charging capacitor C through the first switching tube Q1 and current supply circuit 21
vCCcharging.In the present embodiment, current supply circuit 21 is made up of the 3rd switching tube Q3, diode D1 and the 4th switching tube Q4.
Step S3, at the phase III t3 ~ t4 of a control cycle, charging terminates rear second switch pipe Q2 conducting, and switch main circuit 100 forms loop, for load R powers through the first switching tube Q1 and second switch pipe Q2.
Step S4, at the fourth stage t4 ~ t5 of a control cycle, control circuit 100 turns off the first switching tube Q1 and second switch pipe Q2.Specifically, at the end of the high level stage of the PWM gate pole control signal that control circuit 100 exports, second switch pipe Q2 turns off.When the drain-source voltage of second switch pipe Q2 is lifted to Vcc-Vth1 and the 3rd switching tube Q3 conducting, the gate source voltage of the first switching tube Q1 opens threshold value lower than it, and the first switching tube Q1 turns off.In the present embodiment, the 3rd switching tube Q3 conducting before second switch pipe Q2 turns off.
Self-powered control circuit provided by the invention and control method are based on a PWM control cycle.But, and non-limiting charging capacitor C
vCCall to charge in each PWM control cycle.In actual use, as charging capacitor C
vCCwhen both end voltage is less than charging upper limit threshold value Vcc_limit, self-powered control circuit is to charging capacitor C
vCCcharging.Therefore, by regulating the driving voltage of second switch pipe Q2 to realize whether to charging capacitor C
vCCcharging.Specifically, when needs are to charging capacitor C
vCCduring charging, the pwm control signal exporting second switch pipe Q2 to makes second switch pipe Q2 conducting again after certain time-delay; And when without the need to charging capacitor C
vCCduring charging, ON time and the pwm control signal of second switch pipe Q2 are consistent, namely at the starting stage t1 ~ t2 in cycle, and the first switching tube Q1 and second switch pipe Q2 conducting simultaneously.
Embodiment two
The present embodiment is with embodiment one and change substantially identical, and difference is: as shown in Figure 6, and the diode D1 in a kind of for embodiment current supply circuit 21 is replaced with the 5th switching tube Q5 in the present embodiment, this setting can reduce charge loss further.
In the present embodiment, current supply circuit 21 comprises the 3rd switching tube Q3, the 5th switching tube Q5 and the 4th switching tube Q4.3rd switching tube Q3 is connected to charging capacitor C
vCCand first switching tube Q1 control pole between.5th switching tube Q5 is connected to common port and the charging capacitor C of the first switching tube Q1 and second switch pipe Q2
vCCbetween.Between the common port that 4th switching tube Q4 is connected to the first switching tube Q1 and second switch pipe Q2 and ground.
Figure 7 shows that the sequential chart of each element in the self-powered control circuit that the present embodiment provides.VGS_Q1, VGS_Q2, VGS_Q3, VGS_Q4, VGS_Q5 are respectively switch first switching tube Q1, second switch pipe Q2, the gate drive voltage of the 3rd switch Q3, the 4th switching tube Q4 and the 5th switching tube Q5.Vcc_limit is charging capacitor C
vCCon charging upper limit threshold value, Vds_Q2 is the drain-source voltage of second switch pipe Q2, and IL is the electric current in switch main circuit internal inductance.MN is the voltage of MN output in Fig. 8.
At the first stage t1 ~ t2 of a control cycle, the 4th switching tube Q4 conducting, second switch pipe Q2 turns off, and the 3rd switching tube Q3 turns off, and the 5th switching tube Q5 turns off, charging capacitor C
vCC, form a charge pump loop between the parasitic body diode of the 3rd switching tube Q3 and the 4th switching tube Q4 for the control pole of the first switching tube Q1 and provide voltage, the first switching tube Q1 conducting.
At second stage t2 ~ t3, the 5th switching tube Q5 conducting, second switch pipe Q2 and the 4th switching tube Q4 turns off, and switch main circuit 100 is charging capacitor charging through the first switching tube Q1 and the 5th switching tube Q5, realizes self-powered.
Phase III t3 ~ t4, after charging terminates, the 5th switching tube Q5 turns off, second switch pipe Q2 conducting, and the 5th switching tube Q5 turns off before second switch pipe Q2 conducting, prevents electric capacity Cvcc from being discharged by Q2.Switch main circuit 100 forms loop through the first switching tube Q1 of conducting and second switch pipe Q2, is load supplying.
Fourth stage t4 ~ t5, the control signal that control circuit 100 exports turns off second switch pipe Q2, and the 3rd switching tube Q3 conducting before second switch pipe Q2 turns off, the first switching tube Q1 turns off after opening threshold value lower than it.
Corresponding, the present embodiment also provides a kind of switching circuit, as shown in Figure 8.Switching circuit comprises the self-powered control circuit 200 and switch main circuit 100 that the present embodiment provides.In the present embodiment, switch main circuit is buck circuit.But the present invention is not limited in any way this.In other embodiment, switch main circuit 100 can be any one in buck-boost circuit or flyback circuit.
Identical with embodiment one, the self-powered control circuit that the present embodiment provides and control method are based on a PWM control cycle.But, and non-limiting charging capacitor C
vCCall to charge in each PWM control cycle.A kind of generation second switch pipe Q2 is given, the circuit diagram of the gate drive voltage of the 3rd switching tube Q3, the 4th switching tube Q4 and the 5th switching tube Q5 in Fig. 9.In fig. 8, by MN signal and PWM gate pole control signal phase with realize charging capacitor C
vCCselectivity recharging.
In fig .9, the first comparator CMP1 is a hysteresis comparator, as charging capacitor C
vCCvoltage vcc lower than limiting voltage Vcc_limit time, the output negative terminal EN_CHR of the first comparator CMP1 exports 1.Pwm signal and the single-shot trigger circuit of EN_CHR signal through an one-shot after first with door U1 produce the 4th switching tube Q4 drive singal VGS_Q4,4th switching tube Q4 conducting, formation charge pump loop is that the grid of the first switching tube Q1 is powered, the first switching tube Q1 conducting.At the end of the 4th switching tube Q4 drives, by a reverse swing door, the trailing edge of VGS_Q4 triggers the first rest-set flip-flop U2, makes it put 1 (namely VGS_Q5 signal is 1), 5th switching tube Q5 conducting, switch main circuit is charging capacitor C through the first switching tube Q1 and the 5th switching tube Q5
vCCcharging.
As charging capacitor C
vCCwhen voltage is higher than Vcc_limit, comparator CMP1 exports 1, or reach the maximum ON time TonmaxofQ5 of the 5th switching tube Q5 of setting, or (being judged by the second comparator CMP2) or door U3 output signal 1 and are resetted by first rest-set flip-flop U2 when the charging current peak C urrentsenseofQ5 of the 5th switching tube Q5 reaches limit value CS_limit, VGS_Q5 signal is 0,5th switching tube Q5 turns off, to charging capacitor C
vCCcharging terminates.
MN signal is produced by the second rest-set flip-flop U4, and the reverse signal VGS_Q5N of VGS_Q4 set second rest-set flip-flop U4, VGS_Q5 resets the second rest-set flip-flop U4.MN signal and PWM through second with door U5 phase and the drive singal VGS_Q2 producing second switch pipe Q2.Specifically, as charging capacitor C
vCCvoltage lower than Vcc_limit time, EN_CHR is 1, and when pwm signal is high level, VGS_Q4 exports 1 set second rest-set flip-flop U4, and MN signal is 0, VGS_Q2 signal is 0, and second switch pipe Q2 turns off, switch main circuit through current supply circuit to charging capacitor C
vCCcharging.When VGS_Q4 is 0, the trailing edge of VGS_Q5N signal resets the second rest-set flip-flop U4, and MN signal is that 1, VGS_Q2 signal controls by PWM.And as charging capacitor C
vCCvoltage when being more than or equal to limiting voltage Vcc_limit, EN_CHR is 0, VGS_Q4 be 0, VGS_Q5 be 1, MN signal is 1, and now VGS_Q2 is synchronous with pwm signal, second switch pipe Q2 in starting stage of pwm signal with regard to conducting, charging capacitor C
vCCdo not charge.VGS_Q3 is produced by the 3rd rest-set flip-flop U5, and pwm signal is through reverse signal reset the 3rd rest-set flip-flop U5 of rising edge delay circuit set the 3rd rest-set flip-flop U5, PWM.
In sum, by arranging the charging capacitor, the first switching tube and the second switch pipe that are connected with switch main circuit and arrange current supply circuit between the first switch and charging capacitor.In the starting stage of one-period, charging capacitor provides cut-in voltage, the first switch conduction for the first switching tube.When after the first switching tube conducting, switch main circuit is charging capacitor charging through the first switching tube and current supply circuit, realizes self-powered.Now, in starting stage of one-period and second switch pipe turn off, electric current in switch main circuit is less, the electric current adopting this less carries out charging to charging capacitor and can reduce the loss of charge circuit, realize self-powered while greatly reduce charge loss and the switch stress of diode or the 5th switching tube is less, be very easy to realize.Self-powered control circuit provided by the invention only just increases the current supply circuit be made up of the element of small volume between charging capacitor and the first switching tube, and circuit structure is simple, and circuit cost is low, and facilitates integrated, substantially reduces the volume of control circuit.
Although the present invention discloses as above by preferred embodiment; but and be not used to limit the present invention, anyly know this those skilled in the art, without departing from the spirit and scope of the present invention; can do a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on claims scope required for protection.
Claims (8)
1. a self-powered control circuit, is characterized in that, is connected with switch main circuit, and described self-powered control circuit comprises control circuit and provides the self-powered circuit of operating voltage for control circuit, and described self-powered circuit comprises:
Charging capacitor, is connected with control circuit with switch main circuit respectively, and the voltage on charging capacitor provides operating voltage for control circuit;
Be connected on the first switching tube and the second switch pipe of switch main circuit successively, the control pole connection control circuit of second switch pipe, receives the control signal from control circuit;
Current supply circuit, is connected with charging capacitor with the first switching tube;
In a control cycle, charging capacitor is that the first switching tube is powered, and the first conducting of the first switching tube, switch main circuit is charging capacitor charging through the first switching tube and current supply circuit, and charging terminates the conducting of rear second switch pipe.
2. self-powered control circuit according to claim 1, is characterized in that, described current supply circuit comprises:
3rd switching tube, between the control pole being connected to charging capacitor and the first switching tube;
Diode, between the common port being connected to the first switching tube and second switch pipe and charging capacitor;
4th switching tube, between the common port being connected to the first switching tube and second switch pipe and ground;
In the first stage of a control cycle, 4th switching tube conducting, second switch pipe turns off, 3rd switching tube turns off, form the control pole that a charge pump loop is the first switching tube between the parasitic body diode of charging capacitor, the 3rd switching tube and the 4th switching tube and provide voltage, the first switching tube conducting; In second stage, second switch pipe and the 4th switching tube turn off, and switch main circuit is charging capacitor charging through the first switching tube and diode; Phase III, after charging terminates, the conducting of second switch pipe; Fourth stage, the control signal that control circuit exports turns off second switch pipe, and the conducting before second switch pipe turns off of the 3rd switching tube, the first switching tube gate source voltage turns off after opening threshold value lower than it.
3. self-powered control circuit according to claim 1, is characterized in that, described current supply circuit comprises:
3rd switching tube, between the control pole being connected to charging capacitor and the first switching tube;
5th switching tube, between the common port being connected to the first switching tube and second switch pipe and charging capacitor;
4th switching tube, between the common port being connected to the first switching tube and second switch pipe and ground;
In the first stage of a control cycle, 4th switching tube conducting, second switch pipe turns off, 3rd switching tube turns off, 5th switching tube turns off, form the control pole that a charge pump loop is the first switching tube between the parasitic body diode of charging capacitor, the 3rd switching tube and the 4th switching tube and provide voltage, the first switching tube conducting; In second stage, the 5th switching tube conducting, second switch pipe and the 4th switching tube turn off, and switch main circuit is charging capacitor charging through the first switching tube and the 5th switching tube; Phase III, after charging terminates, the 5th switching tube turns off, the conducting of second switch pipe, and the 5th switching tube turns off before the conducting of second switch pipe; Fourth stage, the control signal that control circuit exports turns off second switch pipe, and the conducting before second switch pipe turns off of the 3rd switching tube, the first switching tube gate source voltage turns off after opening threshold value lower than it.
4. a switching circuit, is characterized in that, comprising:
Switch main circuit is load supplying;
Self-powered control circuit described in any one of claims 1 to 3, is connected with described switch main circuit.
5. switching circuit according to claim 4, is characterized in that, described switch main circuit is any one in buck circuit, buck-boost circuit or flyback circuit.
6. the control method of a self-powered control circuit, it is characterized in that, self-powered control circuit is connected with switch main circuit, self-powered control circuit comprises control circuit and provides the self-powered circuit of operating voltage for control circuit, self-powered circuit comprises and to be connected charging capacitor, current supply circuit with switch main circuit with control circuit and to be connected on the first switching tube and the second switch pipe of switch main circuit successively, and described control method comprises:
Within the first stage of a control cycle, charging capacitor provides turning-on voltage, the first switching tube conducting for the first switching tube;
In the second stage of a control cycle, switch main circuit is charging capacitor charging through the first switching tube and current supply circuit;
In the phase III of a control cycle, charging terminates the conducting of rear second switch pipe, and switch main circuit forms loop through the first switching tube and second switch pipe;
In the fourth stage of a control cycle, control circuit turns off the first switching tube and second switch pipe.
7. the control method of self-powered control circuit according to claim 6, is characterized in that, described current supply circuit comprises:
3rd switching tube, between the control pole being connected to charging capacitor and the first switching tube;
Diode, between the common port being connected to the first switching tube and second switch pipe and charging capacitor;
4th switching tube, between the common port being connected to the first switching tube and second switch pipe and ground;
In the first stage of a control cycle, 4th switching tube conducting, second switch pipe turns off, 3rd switching tube turns off, a charge pump loop is formed between the parasitic body diode of charging capacitor, the 3rd switching tube and the 4th switching tube, for the control pole of the first switching tube provides voltage, the first switching tube conducting; In second stage, second switch pipe and the 4th switching tube turn off, and switch main circuit is charging capacitor charging through the first switching tube and diode; Phase III, after charging terminates, the conducting of second switch pipe; Fourth stage, the control signal that control circuit exports turns off second switch pipe, and the conducting before second switch pipe turns off of the 3rd switching tube, the first switching tube gate source voltage turns off after opening threshold value lower than it.
8. the control method of self-powered control circuit according to claim 6, is characterized in that, described current supply circuit comprises:
3rd switching tube, between the control pole being connected to charging capacitor and the first switching tube;
5th switching tube, between the common port being connected to the first switching tube and second switch pipe and charging capacitor;
4th switching tube, between the common port being connected to the first switching tube and second switch pipe and ground;
In the first stage of a control cycle, 4th switching tube conducting, second switch pipe turns off, 3rd switching tube turns off, 5th switching tube turns off, form the control pole that a charge pump loop is the first switching tube between the parasitic body diode of charging capacitor, the 3rd switching tube and the 4th switching tube and provide voltage, the first switching tube conducting; In second stage, the 5th switching tube conducting, second switch pipe and the 4th switching tube turn off, and switch main circuit is charging capacitor charging through the first switching tube and the 5th switching tube; Phase III, after charging terminates, the 5th switching tube turns off, the conducting of second switch pipe, and the 5th switching tube turns off before the conducting of second switch pipe; Fourth stage, the control signal that control circuit exports turns off second switch pipe, and the conducting before second switch pipe turns off of the 3rd switching tube, the first switching tube gate source voltage turns off after opening threshold value lower than it.
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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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