CN205377665U - From supply control circuit and switch circuit - Google Patents
From supply control circuit and switch circuit Download PDFInfo
- Publication number
- CN205377665U CN205377665U CN201620097562.7U CN201620097562U CN205377665U CN 205377665 U CN205377665 U CN 205377665U CN 201620097562 U CN201620097562 U CN 201620097562U CN 205377665 U CN205377665 U CN 205377665U
- Authority
- CN
- China
- Prior art keywords
- switching tube
- circuit
- switch pipe
- turns
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model provides a from supply control circuit and switch circuit is connected with the switch main circuit from the supply control circuit, including control circuit and for control circuit provide operating voltage from supply circuit, include charging capacitor, first switch tube, second switch pipe and power supply loop from supply circuit. The charging capacitor is connected with switch main circuit and control circuit respectively, and the voltage on the charging capacitor provides operating voltage for control circuit. First switch tube and second switch pipe are established ties in proper order on the switch main circuit, and the control signal who comes from control circuit is received to the control electrode connection control circuit of second switch pipe. Power supply loop is connected with first switch tube and charging capacitor. In a control cycle, the charging capacitor is the power supply of first switch tube, and first switch tube switches on earlier, and the switch main circuit charges for the charging capacitor through first switch tube and power supply loop, and the second switch piping leads to after charging.
Description
Technical field
This utility model relates to on-off control field, and particularly to a kind of self-powered control circuit and on-off circuit.
Background technology
In traditional control circuit method of supplying power to, a kind of is directly adopt independent power supply to power to control circuit, such as linear power supply (LDO) or low power Switching Power Supply.These independent power supplys convert input voltage into the power supply required for control circuit, and typically cost is higher or inefficiency (method that particularly linear power supply method is powered).Another kind of method is to utilize the magnetic cell in Switching Power Supply self, utilize electromagnetic coupled, by assisting winding, produce a suitable output to power to control circuit, this method relative efficiency is higher, less costly, but adds the complexity of magnetic cell processing, and supply voltage is generally by the impact of output voltage and load, changing greatly, quality is not high.
Utilize electromagnetic coupled to realize control circuit for shown in Fig. 1 a switching tube 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 only small, generally can start 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 with oneVCCCharging.In order to reduce loss, generally start resistance bigger.As electric capacity CVCCAfter the voltage (i.e. supply voltage) at two ends reaches startup voltage, control circuit is started working, and output gate pole control signal PWM drives switching tube Q1, Buck circuit to also begin to work, inputs and provides energy to load.Control circuit is after work, and the electric current of consumption can increase, and bigger startup resistance is not provided that electric current during control circuit normal operation, it is therefore desirable to electric capacity CvccThe energy support and control circuit of middle storage works on.Before supply voltage drops to the voltage that can not maintain control circuit normal operation, it is necessary to have other approach to control circuit continued power, maintain its normal operation.Example shown in Fig. 1 utilize the auxiliary winding Na coupled with inductance Lo produce the supply voltage of control circuit, it is therefore desirable to one auxiliary winding Na of extra increase, structure relative complex.And in side circuit, can not couple completely between auxiliary winding Na and inductance Lo, cause that the output voltage Va assisting winding has variation along with the change of load, so that the supply voltage of control circuit is unstable.
Utility model content
Existing control circuit method of supplying power to structure is complicated, cost is high and inefficient problem in order to overcome for this utility model, it is provided that a kind of circuit structure is simple, volume is little and cost is low self-powered control circuit and on-off circuit.
To achieve these goals, this utility model provides a kind of self-powered control circuit being connected with switch main circuit, self-powered control circuit includes control circuit and provides the self-powered circuit of running voltage for control circuit, and self-powered circuit includes charging capacitor, the first switching tube, second switch pipe and current supply circuit.Charging capacitor is connected with switch main circuit and control circuit respectively, and the voltage on charging capacitor provides running voltage for control circuit.First switching tube and second switch pipe are sequentially connected in series on switch main circuit, and the control pole of second switch pipe connects control circuit, receive the control signal from control circuit.Current supply circuit is connected with the first switching tube and charging capacitor.Within a control cycle, charging capacitor is that the first switching tube is powered, and the first switching tube first turns on, and 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 this utility model one embodiment, current supply circuit includes 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.Diode is connected between common port and the charging capacitor of the first switching tube and second switch pipe.4th switching tube is connected between common port and the ground of the first switching tube and second switch pipe.A first stage controlling the cycle, 4th switching tube conducting, second switch pipe turns off, 3rd switching tube turns off, charging capacitor, the 3rd switching tube parasitic body diode and the 4th switching tube between form the control pole that electric charge pump loop is the first switching tube voltage be provided, the first switching tube conducting；Turning off at second stage, second switch pipe and the 4th switching tube, switch main circuit is charging capacitor charging through the first switching tube and diode；Phase III, after charging terminates, second switch pipe turns on；Fourth stage, the control signal of control circuit output turns off second switch pipe, and the 3rd switching tube is conducting before second switch pipe turns off, and the first switching tube gate source voltage turns off after opening threshold value lower than it.
In this utility model one embodiment, current supply circuit includes 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.5th switching tube is connected between common port and the charging capacitor of the first switching tube and second switch pipe.4th switching tube is connected between common port and the ground of the first switching tube and second switch pipe.A first stage controlling the cycle, 4th switching tube conducting, second switch pipe turns off, 3rd switching tube turns off, 5th switching tube turns off, charging capacitor, the 3rd switching tube parasitic body diode and the 4th switching tube between form the control pole that electric charge pump loop is the first switching tube voltage be provided, 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, and second switch pipe turns on, and the 5th switching tube turns off before second switch pipe turns on；Fourth stage, the control signal of control circuit output turns off second switch pipe, and the 3rd switching tube is conducting before second switch pipe turns off, and the first switching tube gate source voltage turns off after opening threshold value lower than it.
In this utility model one embodiment, the 3rd switching tube is conducting before second switch pipe turns off.
A kind of on-off circuit is also provided on the other hand, including switch main circuit and the described above self-powered control circuit being connected with switch main circuit in this utility model.
In this utility model one embodiment, switch main circuit is any one in buck circuit, buck-boost circuit or flyback circuit.
In sum, the self-powered control circuit of this utility model offer and on-off circuit compared with prior art, have the advantage that
By arranging the charging capacitor, the first switching tube and the second switch pipe that are connected with switch main circuit and arranging current supply circuit between the first switch and charging capacitor.A starting stage controlling the 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, it is achieved self-powered.Now, turn off in a starting stage controlling the cycle and second switch pipe, electric current in switch main circuit is less, adopt the electric current that this is less that charging capacitor is charged reducing the loss of charge circuit, realize self-powered while to be greatly reduced the switch stress of charge loss and diode or the 5th switching tube less, be very easy to realize.The self-powered control circuit that this utility model provides only is merely and increases the current supply circuit being made up of the element of small volume between charging capacitor and the first switching tube, circuit structure is simple, circuit cost is low, and is advantageously integrated, and substantially reduces the volume of control circuit.
For above-mentioned and other objects, features and advantages of the present utility model can be become apparent, preferred embodiment cited below particularly, and coordinate accompanying drawing, it is described in detail below.
Accompanying drawing explanation
Fig. 1 show in existing on-off circuit and realizes, by the mode of electromagnetic coupled, the circuit theory diagrams that control circuit is powered.
Fig. 2 show the schematic diagram of the self-powered control circuit that this utility model embodiment one provides.
The sequential chart that Fig. 3 show in Fig. 2 on each element.
Fig. 4 show the schematic diagram of the on-off circuit that this utility model embodiment one provides.
Fig. 5 show the schematic diagram of the self-powered control circuit that this utility model embodiment two provides.
The sequential chart that Fig. 6 show in Fig. 5 on each element.
Fig. 7 show the schematic diagram of the on-off circuit that this utility model embodiment two provides.
The driving signal that Fig. 8 show in Fig. 5 each switching tube produces schematic diagram.
Detailed description of the invention
Embodiment one
As shown in Figure 2, the present embodiment provides a kind of self-powered control circuit 200 being connected with switch main circuit 100, self-powered control circuit 200 includes control circuit 1 and provides the self-powered circuit 2 of running voltage for control circuit 1, and self-powered circuit 2 includes charging capacitor CVCC, the first switching tube Q1, second switch pipe Q2 and current supply circuit 21.Charging capacitor CVCCIt is connected with switch main circuit 100 and control circuit 1 respectively, charging capacitor CVCCOn voltage provide running voltage for control circuit 1.First switching tube Q1 and second switch pipe Q2 is sequentially connected in series on switch main circuit 100.The control pole of second switch pipe Q2 connects control circuit 1, receives the control signal from control circuit 1.Current supply circuit 21 and the first switching tube Q1 and charging capacitor CVCCIt is connected.Within a control cycle, charging capacitor CVCCBeing that the first switching tube Q1 powers, the first switching tube Q1 first turns on, and switch main circuit 100 is charging capacitor C through the first switching tube Q1 and current supply circuit 21VCCCharging, charging terminates rear second switch pipe Q2 conducting.
The self-powered control circuit that the present embodiment provides passes through charging capacitor C within a control cycleVCCAllowing the first switching tube Q1 first turn on and turn on after second switch pipe Q2 time delay certain time, switch main circuit 100 realizes charging capacitor C through the first switching tube Q1 and current supply circuit 21VCCSelf-powered so that charging capacitor CVCCThe voltage at two ends can be stable provide running voltage for control circuit 1.Further, owing to controlling the starting stage in cycle at one, the electric current of switch main circuit 100 is less, and utilizing the electric current that this is less is charging capacitor CVCC, virtual 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 includes the 3rd switching tube Q3, diode D1 and the four switching tube Q4.3rd switching tube Q3 is connected to charging capacitor CVCCAnd 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 Q2VCCBetween.4th switching tube Q4 is connected between common port and the ground of the first switching tube Q1 and second switch pipe Q2.Concrete self-powered process is as follows:
Sequential chart as shown in Figure 3, wherein, VGS_Q1, VGS_Q2, VGS_Q3, VGS_Q4 respectively switch the first switching tube Q1, second switch pipe Q2, the gate drive voltage of the 3rd switching tube Q3 and the four switching tube Q4.ID1 is the electric current on diode D1, and Vcc_limit is charging capacitor CVCCOn 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 a first stage t1～t2 controlling the cycle, the 4th switching tube Q4 conducting, second switch pipe Q2 turns off, and the 3rd switching tube Q3 turns off, charging capacitor CVCC, the 3rd switching tube Q3 parasitic body diode and the 4th switching tube Q4 between form the control pole that electric charge pump loop is the first switching tube Q1 voltage be provided, 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.
Turning off at second stage t2～t3, second switch pipe Q2 and the four switching tube Q4, switch main circuit 100 is charging capacitor C through the first switching tube Q1 and diode D1 of conductingVCCCharging.
Phase III t3～t4, charging terminates, and second switch pipe Q2 turns on, and switch main circuit 100 forms loop through the first switching tube Q1 and second switch pipe Q2 of conducting, for load supplying.
Fourth stage t4～t5, one controls end cycle, the control signal of control circuit 1 output turns off second switch pipe Q2,3rd switching tube Q3 is 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 the Vcc-Vth1 threshold voltage of the first switching tube Q1 (Vth1 be), 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 begins to decline.
In the present embodiment, the first switching tube Q1, second switch pipe Q2, the 3rd switch Q3 and the four switching tube Q4 is mos pipe.But, this is not limited in any way by this utility model.In other embodiments, the first switching tube Q1, second switch pipe Q2, the 3rd switch Q3 and the four switching tube Q4 can be the full-control type semiconductor device such as audion or IGBT.As in figure 2 it is shown, the drain series of the source electrode of the first switching tube Q1 and second switch pipe Q2.
Corresponding, as shown in Figure 4, the present embodiment also provides for a kind of on-off circuit.Described on-off circuit includes 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, this is not limited in any way by this utility model.In other embodiments, switch main circuit 100 can be any one in buck-boost circuit or flyback circuit.
This utility model also provides for the control method of a kind of self-powered control circuit, self-powered control circuit 200 is connected with switch main circuit 100, self-powered control circuit 200 includes control circuit 1 and provides the self-powered circuit 2 of running voltage for control circuit 1, and self-powered circuit 2 includes being connected with switch main circuit 100 and control circuit 1 charging capacitor CVCC, current supply circuit 21 and be sequentially connected in series the first switching tube Q1 and second switch pipe Q2 at switch main circuit, control method includes:
Step S1, at first stage t1～t2, a charging capacitor C controlling the cycleVCCTurning-on voltage is provided, the first switching tube Q1 conducting for the first switching tube Q1.In the present embodiment, charging capacitor CVCC, the 3rd switching tube Q3 parasitic body diode and the 4th switching tube Q2 between form the control pole that electric charge pump loop is the first switching tube Q1 and provide voltage to make the first switching tube Q1 conducting.
Step S2, at a second stage t2～t3 controlling the cycle, switch main circuit 100 is charging capacitor C through the first switching tube Q1 and current supply circuit 21VCCCharging.In the present embodiment, current supply circuit 21 is made up of the 3rd switching tube Q3, diode D1 and the four switching tube Q4.
Step S3, at a phase III t3～t4 controlling the cycle, charging terminates rear second switch pipe Q2 conducting, and switch main circuit 100 forms loop through the first switching tube Q1 and second switch pipe Q2, powers for load R.
Step S4, at a fourth stage t4～t5 controlling the cycle, control circuit 100 turns off the first switching tube Q1 and second switch pipe Q2.Specifically, when the high level stage of the PWM gate pole control signal of control circuit 100 output terminates, second switch pipe Q2 turns off.Be lifted to Vcc-Vth1 and the 3rd switching tube Q3 conducting when the drain-source voltage of second switch pipe Q2, 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 is conducting before second switch pipe Q2 turns off.
The self-powered control circuit that this utility model provides is based on a PWM and controls the cycle.But, and non-limiting charging capacitor CVCCCharging it is intended within each PWM control cycle.In actual use, as charging capacitor CVCCWhen both end voltage is less than charging upper limit threshold value Vcc_limit, self-powered control circuit is to charging capacitor CVCCCharging.Therefore, whether can be realized to charging capacitor C by the driving voltage of adjustment second switch pipe Q2VCCCharging.Specifically, when needs are to charging capacitor CVCCDuring charging, output makes second switch pipe Q2 turn on again to the pwm control signal of second switch pipe Q2 after certain time-delay；And when without to charging capacitor CVCCDuring charging, the ON time of second switch pipe Q2 keeps consistent with pwm control signal, namely simultaneously turns at the starting stage t1～t2 in cycle, the first switching tube Q1 and second switch pipe Q2.
Embodiment two
The present embodiment and embodiment one and change essentially identical, be distinctive in that: as it is shown in figure 5, by the 5th switching tube Q5 replacing with in the present embodiment of the diode D1 in a kind of for embodiment current supply circuit 21, this setting can reduce charge loss further.
In the present embodiment, current supply circuit 21 includes the 3rd switching tube Q3, the 5th switching tube Q5 and the four switching tube Q4.3rd switching tube Q3 is connected to charging capacitor CVCCAnd 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 Q2VCCBetween.4th switching tube Q4 is connected between common port and the ground of the first switching tube Q1 and second switch pipe Q2.
Fig. 6 show 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 respectively switch the first switching tube Q1, second switch pipe Q2, and the 3rd switchs the gate drive voltage of Q3, the 4th switching tube Q4 and the five switching tube Q5.Vcc_limit is charging capacitor CVCCOn 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 outfan in Fig. 8.
At a first stage t1～t2 controlling the 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 CVCC, the 3rd switching tube Q3 parasitic body diode and the 4th switching tube Q4 between form the control pole that electric charge pump loop is the first switching tube Q1 voltage be provided, the first switching tube Q1 conducting.
In second stage t2～t3, the 5th switching tube Q5 conducting, second switch pipe Q2 and the four switching tube Q4 turns off, and switch main circuit 100 is charging capacitor charging through the first switching tube Q1 and the five switching tube Q5, it is achieved self-powered.
Phase III t3～t4, after charging terminates, the 5th switching tube Q5 turns off, and second switch pipe Q2 turns on, and the 5th switching tube Q5 turns off before second switch pipe Q2 turns on, it is prevented that electric capacity Cvcc is discharged by Q2.Switch main circuit 100 forms loop through the first switching tube Q1 and second switch pipe Q2 of conducting, for load supplying.
Fourth stage t4～t5, the control signal of control circuit 100 output turns off second switch pipe Q2, the 3rd switching tube Q3 conducting before second switch pipe Q2 turns off, and the first switching tube Q1 turns off after opening threshold value lower than it.
Corresponding, the present embodiment also provides for a kind of on-off circuit, as shown in Figure 7.On-off circuit includes self-powered control circuit 200 and the switch main circuit 100 that the present embodiment provides.In the present embodiment, switch main circuit is buck circuit.But, this is not limited in any way by this utility model.In other embodiments, 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 is based on a PWM and controls the cycle.But, and non-limiting charging capacitor CVCCCharging it is intended within each PWM control cycle.Fig. 8 gives the circuit diagram of a kind of gate drive voltage producing second switch pipe Q2, the 3rd switching tube Q3, the 4th switching tube Q4 and the five switching tube Q5.In fig. 8, by MN signal and PWM gate pole control signal with realize charging capacitor CVCCSelectivity recharging.
In fig. 8, the first comparator CMP1 is a hysteresis comparator, as charging capacitor CVCCVoltage vcc lower than limiting voltage Vcc_limit time, the first comparator CMP1 output negative terminal EN_CHR output 1.Pwm signal and EN_CHR signal produce the 4th switching tube Q4 through the single-shot trigger circuit of an one-shot after first with door U1 and drive signal VGS_Q4,4th switching tube Q4 conducting, form the grid that electric charge pump loop is the first switching tube Q1 to power, the first switching tube Q1 conducting.When the 4th switching tube Q4 drives end, by a reverse swing door, the trailing edge of VGS_Q4 triggers the first rest-set flip-flop U2 so that it is 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 five switching tube Q5VCCCharging.
As charging capacitor CVCCWhen voltage is higher than Vcc_limit, comparator CMP1 output 1, or reach the maximum ON time TonmaxofQ5 of the 5th switching tube Q5 set, or (judged by the second comparator CMP2) when the charging current peak C urrentsenseofQ5 of the 5th switching tube Q5 reaches limit value CS_limit or door U3 exports signal 1 and resetted by first rest-set flip-flop U2, VGS_Q5 signal is 0,5th switching tube Q5 turns off, to charging capacitor CVCCCharging terminates.
MN signal is produced by the second rest-set flip-flop U4, and the reverse signal VGS_Q5N of VGS_Q4 set the 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 driving signal VGS_Q2 producing second switch pipe Q2.Specifically, as charging capacitor CVCCVoltage lower than Vcc_limit time, EN_CHR is 1, and when pwm signal is high level, it be 0, VGS_Q2 signal is 0 that VGS_Q4 exports 1 set the second rest-set flip-flop U4, MN signal, and second switch pipe Q2 turns off, switch main circuit through current supply circuit to charging capacitor CVCCCharging.When VGS_Q4 is 0, the trailing edge of VGS_Q5N signal second rest-set flip-flop U4, the MN signal that resets is that 1, VGS_Q2 signal is controlled by PWM.And as charging capacitor CVCCVoltage more than or equal to limiting voltage Vcc_limit time, EN_CHR is 0, VGS_Q4 be 0, VGS_Q5 be 1, MN signal is 1, and now VGS_Q2 is Tong Bu with pwm signal, and second switch pipe Q2 turned in the starting stage of pwm signal, charging capacitor CVCCDo 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 arranging current supply circuit between the first switch and charging capacitor.In the starting stage in a 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, it is achieved self-powered.Now, starting stage and second switch pipe a cycle turn off, electric current in switch main circuit is less, adopt the electric current that this is less that charging capacitor is charged reducing the loss of charge circuit, realize self-powered while to be greatly reduced the switch stress of charge loss and diode or the 5th switching tube less, be very easy to realize.The self-powered control circuit that this utility model provides only is merely and increases the current supply circuit being made up of the element of small volume between charging capacitor and the first switching tube, circuit structure is simple, circuit cost is low, and is advantageously integrated, and substantially reduces the volume of control circuit.
Although this utility model is disclosed above by preferred embodiment; but it is not limited to this utility model; any know this those skilled in the art; without departing from spirit and scope of the present utility model; can doing a little change and retouching, therefore protection domain of the present utility model is when being as the criterion depending on claims scope required for protection.
Claims (5)
1. a self-powered control circuit, it is characterised in that be connected with switch main circuit, described self-powered control circuit includes control circuit and provides the self-powered circuit of running voltage for control circuit, and described self-powered circuit includes:
Charging capacitor, is connected with switch main circuit and control circuit respectively, and the voltage on charging capacitor provides running voltage for control circuit；
Being sequentially connected in series at the first switching tube of switch main circuit and second switch pipe, the control pole of second switch pipe connects control circuit, receives the control signal from control circuit；
Current supply circuit, is connected with the first switching tube and charging capacitor；
Within a control cycle, charging capacitor is that the first switching tube is powered, and the first switching tube first turns on, and 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, it is characterised in that described current supply circuit includes:
3rd switching tube, is connected between the control pole of charging capacitor and the first switching tube；
Diode, is connected between common port and the charging capacitor of the first switching tube and second switch pipe；
4th switching tube, is connected between common port and the ground of the first switching tube and second switch pipe；
A first stage controlling the cycle, 4th switching tube conducting, second switch pipe turns off, 3rd switching tube turns off, charging capacitor, the 3rd switching tube parasitic body diode and the 4th switching tube between form the control pole that electric charge pump loop is the first switching tube voltage be provided, the first switching tube conducting；Turning off at second stage, second switch pipe and the 4th switching tube, switch main circuit is charging capacitor charging through the first switching tube and diode；Phase III, after charging terminates, second switch pipe turns on；Fourth stage, the control signal of control circuit output turns off second switch pipe, and the 3rd switching tube is conducting before second switch pipe turns off, and 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, it is characterised in that described current supply circuit includes:
3rd switching tube, is connected between the control pole of charging capacitor and the first switching tube；
5th switching tube, is connected between common port and the charging capacitor of the first switching tube and second switch pipe；
4th switching tube, is connected between common port and the ground of the first switching tube and second switch pipe；
A first stage controlling the cycle, 4th switching tube conducting, second switch pipe turns off, 3rd switching tube turns off, 5th switching tube turns off, charging capacitor, the 3rd switching tube parasitic body diode and the 4th switching tube between form the control pole that electric charge pump loop is the first switching tube voltage be provided, 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, and second switch pipe turns on, and the 5th switching tube turns off before second switch pipe turns on；Fourth stage, the control signal of control circuit output turns off second switch pipe, and the 3rd switching tube is conducting before second switch pipe turns off, and the first switching tube gate source voltage turns off after opening threshold value lower than it.
4. an on-off circuit, it is characterised in that including:
Switch main circuit, for load supplying；
Self-powered control circuit described in any one of claims 1 to 3, is connected with described switch main circuit.
5. on-off circuit according to claim 4, it is characterised in that described switch main circuit is any one in buck circuit, buck-boost circuit or flyback circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620097562.7U CN205377665U (en) | 2016-01-28 | 2016-01-28 | From supply control circuit and switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620097562.7U CN205377665U (en) | 2016-01-28 | 2016-01-28 | From supply control circuit and switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205377665U true CN205377665U (en) | 2016-07-06 |
Family
ID=56262355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620097562.7U Withdrawn - After Issue CN205377665U (en) | 2016-01-28 | 2016-01-28 | From supply control circuit and switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205377665U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553259A (en) * | 2016-01-28 | 2016-05-04 | 杰华特微电子（杭州）有限公司 | Self power supply control circuit, control method and switching circuit |
| CN106300962A (en) * | 2016-08-08 | 2017-01-04 | 杰华特微电子（杭州）有限公司 | A kind of self-powered control circuit |
-
2016
- 2016-01-28 CN CN201620097562.7U patent/CN205377665U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553259A (en) * | 2016-01-28 | 2016-05-04 | 杰华特微电子（杭州）有限公司 | Self power supply control circuit, control method and switching circuit |
| CN105553259B (en) * | 2016-01-28 | 2018-11-13 | 杰华特微电子（杭州）有限公司 | self-powered control circuit, control method and switching circuit |
| CN106300962A (en) * | 2016-08-08 | 2017-01-04 | 杰华特微电子（杭州）有限公司 | A kind of self-powered control circuit |
| CN106300962B (en) * | 2016-08-08 | 2019-06-11 | 杰华特微电子（杭州）有限公司 | A kind of self-powered control circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202094794U (en) | Bootstrap driving and controlling circuit of gate pole | |
| CN102231605B (en) | Synchronous rectification control circuit of switch power supply secondary and flyback switch power supply | |
| CN102802318B (en) | Flyback-type quick-start LED (Light-Emitting Diode) drive circuit structure | |
| CN104201884B (en) | A kind of Sofe Switch DC DC translation circuit | |
| CN203590031U (en) | DC-DC converter realizing high-efficiency high-gain low-voltage current stress | |
| CN105553259A (en) | Self power supply control circuit, control method and switching circuit | |
| CN103199677A (en) | One-way isolated type metal-oxide-semiconductor filed-effect transistor (MOSFET) drive circuit | |
| CN102497101B (en) | Self-excited Buck circuit | |
| CN206060530U (en) | A kind of single tube buck boost soft switch devices | |
| CN108322053B (en) | Step-down conversion circuit | |
| CN205377665U (en) | From supply control circuit and switch circuit | |
| CN103066841A (en) | Voltage-multiplying DC converter based on charge pump capacitor | |
| CN104052279A (en) | Self-excited Sepic converter based on MOSFET | |
| CN110086342A (en) | A kind of switch converters and its control method | |
| CN203645540U (en) | A high-efficiency high-gain DC-DC converter with coupling inductors | |
| CN102820784B (en) | BJT (bipolar junction transistor)-type auto-excitation Buck converter with small main switching tube driving loss | |
| CN103683892B (en) | Switching Power Supply and controller thereof | |
| CN105871202B (en) | A kind of single tube buck-boost soft switch device | |
| CN103633835B (en) | The DC-DC converter of High-efficiency high-gain low-voltage current stress | |
| CN207265872U (en) | A kind of high-low pressure synchronization active clamp conversion circuit | |
| CN102403896A (en) | Self excited Boost converter based on MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) | |
| CN112953240B (en) | High-gain energy storage buck converter based on coupling inductance | |
| CN202759386U (en) | Flyback switch power supply circuit and flyback switch power supply | |
| CN104967334A (en) | Novel balanced modulation type trilinear buffer driving multi-path output voltage-stabilized power supply | |
| CN204131398U (en) | A kind of supply convertor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160706 Effective date of abandoning: 20181113 |
|
| AV01 | Patent right actively abandoned |