CN105048790A - Power tube control system and drive circuit for driving external power tube - Google Patents
Power tube control system and drive circuit for driving external power tube Download PDFInfo
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- CN105048790A CN105048790A CN201510433217.6A CN201510433217A CN105048790A CN 105048790 A CN105048790 A CN 105048790A CN 201510433217 A CN201510433217 A CN 201510433217A CN 105048790 A CN105048790 A CN 105048790A
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Abstract
The invention discloses a power tube control system and a drive circuit for driving an external power tube. When an external pulse-width modulation (PWM) signal is in high level, a slope inflection point detection unit detects slope change of grid voltage of the external power tube; when the changing slope of the grid voltage is in front of an inflection point A, a first switch tube is closed by a control unit, and a grid of the external power tube is charged by the first switch and a current source; when the changing slope of the grid voltage is between the inflection point A and an inflection point B, the first switch tube is cut off by the control unit, and the first switch tube stops charging the grid of the external power tube; and when the changing slope of the grid voltage is behind the inflection point B, the first switch tube is closed by the control unit, and the grid of the external power tube is charged again, so that an obvious slope change point of the grid voltage of the external power tube is detected by the slope inflection point detection unit; control on the current slope of a drain when the external power tube is started is realized; and the universality of the power tubes with different model numbers from different manufacturers is reached.
Description
Technical field
The present invention relates to power tube Driving technique, particularly power tube control system and for driving the drive circuit of external power tube.
Background technology
Along with the maturation gradually of switch power technology development, EMI(ElectromagneticInterference, electromagnetic interference) performance becomes power-supply system inevitably, is also the most scabrous problem.
The quality of power supply EMI performance, except with PCBLayout(PCB layout), except transformer device structure has direct relation, the more important thing is relevant to opening of power tube, power tube is operated in the state of ON-OFF Rapid Circulation conversion, drain-source current is sharply changing, and the key affecting switch power supply EMI performance is the slope (di/dt) changed at the drain-source current of power tube open stage, and these are all closely bound up with the Driving technique of power tube.
Existing power tube Driving technique generally adopts totem pole configuration, namely receive power supply and all adopt switch form with the driving tube on ground, as shown in Figure 1, first switching tube is upper driving tube, second switch pipe is lower driving tube, utilize this driving circuit structure to carry out driving power pipe, its application circuit as shown in Figure 2.In the moment that upper driving tube is opened, grid capacitance (comprising grid source electric capacity and the gate leakage capacitance) charging that upper driving tube is power tube M1 with its maximum current capability, power tube M1 is caused to open rapidly, in power tube M1 opening process, its drain-source current rate of rise is very large, namely di/dt is very large, and large di/dt can cause the EMI degradation of Switching Power Supply.
In order to improve the EMI degradation problem that above-mentioned Driving technique causes, one of conventional solution between the grid and driving stage of external power tube, seals in one drive resistance R1, as shown in Figure 3, this drives resistance R1 can be used for being restricted to the electric current of power tube M1 gate charges, to play the effect of the slope (di/dt) reducing drain-source firing current.But this ameliorative way has its very important drawback: one, this driving resistance R1 drive a current through in the process of power tube M1 turn-on and turn-off, produce extra power consumption, lower efficiency; Two, in power tube M1 turn off process, this drives the time needed for resistance R1 meeting increasing power pipe M1 shutoff, finally increases the switching loss of power tube M1, reduces efficiency.
In order to improve the EMI degradation problem that above-mentioned Driving technique causes further, conventional solution two as shown in Figure 4 and Figure 5, the grid voltage VH of power tube M1 corresponding when this mode is reduced to Rdson*Id by drain-source voltage in the turn-on threshold voltage VL of detection power pipe M1 and power tube M1 opening process, wherein Rdson represents the conduction impedance of power tube, and drain terminal electric current corresponding when Id represents power tube M1 complete conducting.When the grid voltage VGATE of power tube M1 is lower than VL or higher than VH, the first switching tube closes, and utilizes big current to power tube M1 gate capacitance charges; When the grid voltage VGATE of power tube M1 is higher than VL and lower than VH, utilizes the gate capacitance charges of current source for power tube of small area analysis, thus achieve the improvement of power tube EMI performance.And the shortcoming of this driving method is: internal reference voltage VH and VL needs to design according to the threshold voltage vt h of power tube M1.Due to different manufacturers, dissimilar power tube threshold voltage vt h characteristic difference, that is this driving method is for dissimilar, and the power tube of different manufacturers does not have versatility.
Visible, the Driving technique of existing external power tube still has very large room for improvement.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of power tube control system and for driving the drive circuit of external power tube, while improving EMI performance, control the versatility of drive circuit.
In order to achieve the above object, this invention takes following technical scheme:
A kind of for driving the drive circuit of external power tube, it comprises power tube and opens driver module and power tube shutoff driver module, described power tube is opened driver module and is comprised slope-inversion point detecting unit, control unit, the first switching tube, second switch pipe and current source, and described power tube turns off driver module and comprises inverter and the 3rd switching tube, when outside pwm control signal is high level, second switch pipe closes, described slope-inversion point detecting unit detects the slope variation of the grid voltage of external power tube, when the change slope of grid voltage is before the first slope-inversion point, control unit makes the first switching tube close, the gate charges of external power tube is given by the first switching tube and current source, when the change slope of grid voltage is between the first slope-inversion point and the second slope-inversion point, control unit makes the first switching tube disconnect, the first switching tube is made to stop to the gate charges of external power tube, when the change slope of grid voltage is after the second slope-inversion point, control unit makes the first switching tube close, make the first switching tube again to the gate charges of external power tube, when outside pwm control signal is low level, the first switching tube and second switch pipe all disconnect, the 3rd switching tube closes, and make the gate discharge of external power tube.
Described for driving in the drive circuit of external power tube, described power tube is opened driver module and is also comprised the first buffer and the second buffer, and described power tube is closed driver module and also comprised the 3rd buffer; The input of described slope-inversion point detecting unit connects the grid of external power tube, the first input end of the output connection control unit of slope-inversion point detecting unit, and the output of control unit connects the grid of the first switching tube by the first buffer; The input of the second buffer connects the second input of outside pwm control signal output and control unit, and the output of the second buffer connects the grid of second switch pipe; The drain electrode of the first switching tube is connect driving voltage feeder ear, is also connected the drain electrode of second switch pipe by current source, and the source electrode of the first switching tube is connected the grid of external power tube with the source electrode of second switch pipe; The input of described inverter connects outside pwm control signal output, the output of inverter connects the grid of the 3rd switching tube by the 3rd buffer, the drain electrode of the 3rd switching tube connects the source electrode of the first switching tube, the source electrode of second switch pipe and the grid being connected external power tube, the source ground of the 3rd switching tube.
Described for driving in the drive circuit of external power tube, described slope-inversion point detecting unit comprises analog to digital converter, latch, digital comparator and digital to analog converter, when outside pwm control signal is high level by low transition, the grid voltage of external power tube starts to rise, detect the grid voltage of external power tube in real time by analog to digital converter and be converted to digital signal, the digital signal in this cycle is input to the in-phase input end of described digital comparator, simultaneously, digital to analog converter is by digital signal input latch, the input signal of the inverting input of digital comparator is made to be the sample conversion signal of analog to digital converter to the last cycle of grid voltage, the grid voltage in this cycle and the grid voltage in last cycle compare by described digital comparator, export corresponding low and high level signal to be converted to after analog signal through described digital to analog converter and to export in control unit.
Described for driving in the drive circuit of external power tube, described slope-inversion point detecting unit also comprises the 4th buffer, the output of the input linking number weighted-voltage D/A converter of described 4th buffer, the first input end of the output connection control unit of the 4th buffer.
Described for driving in the drive circuit of external power tube, described first switching tube, second switch pipe and the 3rd switching tube are NMOS tube.
A kind of power tube control system, it comprises: inductance, external power tube and drive circuit as above, the grid of described external power tube connects described drive circuit, and the drain electrode of described external power tube connects VIN feeder ear by described inductance, the source ground of described external power tube.
Compared to prior art, power tube control system provided by the invention and for driving the drive circuit of external power tube, comprise power tube and open driver module and power tube shutoff driver module, described power tube is opened driver module and is comprised slope-inversion point detecting unit, control unit, the first switching tube, second switch pipe and current source, and described power tube turns off driver module and comprises inverter and the 3rd switching tube, when outside pwm control signal is high level, second switch pipe closes, described slope-inversion point detecting unit detects the slope variation of the grid voltage of external power tube, when the change slope of grid voltage is before the first slope-inversion point, control unit makes the first switching tube close, the gate charges of external power tube is given by the first switching tube and current source, when the change slope of grid voltage is between the first slope-inversion point and the second slope-inversion point, control unit makes the first switching tube disconnect, the first switching tube is made to stop to the gate charges of external power tube, when the change slope of grid voltage is after the second slope-inversion point, control unit makes the first switching tube close, make the first switching tube again to the gate charges of external power tube, when outside pwm control signal is low level, first switching tube and second switch pipe all disconnect, 3rd switching tube closes, make the gate discharge of external power tube, thus the slope significant change point of the grid voltage of external power tube is detected by slope-inversion point detecting unit, achieve the control of drain current slope (di/dt) when external power tube being opened when outside pwm control signal is high level, reach and improve EMI performance and do not increase again extra loss function, when pwm signal is low level, external power tube is turned off rapidly, do not increase extra turn-off power loss.And for different power tubes, the present invention still can detect the slope-inversion point of the gate source voltage of external power tube automatically, reach the universal applicability to different manufacturers, different model power tube.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the drive circuit of existing power tube.
Fig. 2 is the schematic diagram of the Application Example of the drive circuit of existing power tube.
Fig. 3 is the schematic diagram of the Application Example of the drive circuit of a kind of mode of ameliorating of prior art.
Fig. 4 is the schematic diagram of the drive circuit of the another kind of mode of ameliorating of prior art.
Fig. 5 is the schematic diagram of the Application Example of the drive circuit of the another kind of mode of ameliorating of prior art.
Fig. 6 is provided by the invention for driving the structural representation of the drive circuit of external power tube.
Fig. 7 is the structural representation of power tube control system provided by the invention.
Fig. 8 is that the present invention utilizes drive circuit to detect external power tube voltage and current waveform schematic diagram.
Fig. 9 is provided by the invention for driving in the drive circuit of external power tube, the circuit diagram of slope-inversion point detecting unit.
Embodiment
The invention provides power tube control system and for driving the drive circuit of external power tube, for making object of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Provided by the invention for driving the drive circuit of external power tube, opening and shutting off of external power tube is controlled by outside pwm control signal, when outside pwm control signal is high level, described external power tube opens (power tube conducting), and when outside pwm control signal is low level, described external power tube turns off (power tube cut-off).Because EMI performance in switch power supply system is main closely related with the opening process of power tube, the present invention mainly carries out labor to power tube opening process, and the turn off process of power tube is existing mature technology, be not then described in detail.
Refer to Fig. 6 and Fig. 7, described drive circuit comprises power tube and opens driver module 110 and power tube shutoff driver module 120, described power tube is opened driver module 110 and is comprised slope-inversion point detecting unit 111, control unit 113, first switching tube S1, second switch pipe S2 and current source I1, and described power tube turns off driver module 120 and comprises inverter A4 and the 3rd switching tube S3.Described first switching tube S1, second switch pipe S2 and the 3rd switching tube S3 are NMOS tube, the conducting when its grid is high level, end for during low level.
Operationally, when outside pwm control signal is high level, second switch pipe S2 closes, described slope-inversion point detecting unit 111 detects the slope variation of the grid voltage of external power tube, when the change slope of grid voltage is before the first slope-inversion point, control unit 113 makes the first switching tube S1 close, the gate charges of external power tube is given by the first switching tube S1 and current source I1, when the change slope of grid voltage is between the first slope-inversion point and the second slope-inversion point, control unit 113 makes the first switching tube S1 disconnect, the first switching tube S1 is made to stop to the gate charges of external power tube, when the change slope of grid voltage is after the second slope-inversion point, control unit 113 makes the first switching tube S1 close, make the first switching tube S1 again to the gate charges of external power tube, when outside pwm control signal is low level, the first switching tube S1 and second switch pipe S2 all disconnects, the 3rd switching tube S3 closes, and makes the gate discharge of external power tube.
Please continue to refer to Fig. 6 and Fig. 7, described power tube is opened driver module 110 and is also comprised the first buffer A1 and the second buffer A2, and described power tube is closed driver module and also comprised the 3rd buffer A3; The input of described slope-inversion point detecting unit 111 connects the grid of external power tube, the first input end of the output connection control unit 113 of slope-inversion point detecting unit 111, the output of control unit 113 connects the grid of the first switching tube S1 by the first buffer A1; The input of the second buffer A2 connects the second input of outside pwm control signal output and control unit 113, and the output of the second buffer A2 connects the grid of second switch pipe S2; The drain electrode of the first switching tube S1 is connect driving voltage feeder ear, is also connected the drain electrode of second switch pipe S2 by current source I1, and the source electrode of the first switching tube S1 is connected the grid of external power tube with the source electrode of second switch pipe S2; The input of described inverter A4 connects outside pwm control signal output, the output of inverter A4 connects the grid of the 3rd switching tube S3 by the 3rd buffer A3, the drain electrode of the 3rd switching tube S3 connects the source electrode of the first switching tube S1, source electrode and the grid being connected external power tube of second switch pipe S2, the source ground of the 3rd switching tube S3.
The slope significant change point of the present invention by utilizing slope-inversion point detecting unit 111 to detect the grid voltage VGATE of external power tube respectively, as shown in Figure 8, in fig. 8, VGATE represents the gate source voltage of power tube, IDS represents the drain-source current of power tube, and VDS represents the drain-source voltage of power tube.The frequency inflection point A of grid voltage VGATE and B in waveform, when grid voltage VGATE is in before A point, the first switching tube S1 closes, when grid voltage VGATE to be in after A point before B point, the first switching tube S1 opens, when grid voltage VGATE be in B point afterwards time again the first switching tube S1 close.In the invention process, the miller platform (i.e. Miller platform) of the corresponding power tube of the grid voltage VGATE waveform between A point and B point, by the upper control that namely can realize charging current when being in Miller platform to power tube gate source voltage, now charging current is current source I1, and after power tube grid voltage reaches before threshold voltage and Miller platform terminates, the large current charge after the grid of external power tube is closed by the first switching tube S1; When outside pwm control signal is low level, the upper driving switch pipe (i.e. the first switching tube S1 and second switch pipe S2) of external power tube is all opened, and lower driving switch pipe (i.e. the 3rd switching tube S3) closes, and is the gate discharge of power tube with big current.
From above-mentioned, the control that present invention achieves drain current slope (di/dt) when opening power tube when outside pwm control signal is high level reaches and improves EMI performance and do not increase extra loss again, when outside pwm control signal is low level, external power tube is turned off rapidly, does not increase extra turn-off power loss.Still automatically can detect flex point A and the B of gate source voltage slope-inversion point for different power tube the present invention, also just determine the scope of Miller platform, reach the universal applicability to different model power tube.
In specific implementation process, when outside pwm control signal is high level from low transition, it is all high level that described first buffer A1 and the second buffer A2 outputs signal Vs1 and Vs2, make the first switching tube S1 and two switching tubes all closed, now, described current source I1 and described first switching tube S1 starts to charge to the grid source electric capacity C2 of described external power tube simultaneously, the grid voltage of described external power tube is made to start quick rising, when described slope-inversion point detecting unit 111 detects that the grid voltage VGATE slope of described external power tube is by when diminishing suddenly greatly, flex point A namely shown in Fig. 8, described control unit 113 outputs signal Vcont and becomes low level, make the first buffer A1 output signal Vs1 further and become low level, thus the first switching tube S1 is disconnected, big current path for the raster data model of described external power tube is disconnected, described current source I1 is only had to be that the gate leakage capacitance C1 of described external power tube charges, and gate source voltage is not owing to having electric current for described grid source electric capacity C2 charges and keep constant, current capacity now due to described current source I1 is very little, the drain terminal electric current rate of rise (di/dt) of described external power is controlled, the drain-source voltage of described external power tube starts to diminish gradually until equal Rdson*Id simultaneously, when the drain-source current of described external power tube reaches maximum, now described current source I1 starts as described grid source electric capacity C2 charges again, now the grid voltage of described external power tube can raise again gradually, when described slope-inversion point detecting unit 111 detects that the grid voltage VGATE slope of described external power tube is large by little unexpected change, flex point B namely shown in Fig. 8, making described control unit 113 output signal Vcont is high level, it exports high level signal Vs1 through described first buffer A1, described first switching tube S1 is closed, the described grid source electric capacity C2 being described external power tube fast with big current again charges until gate voltage VGATE arrives the maximum voltage value that it can reach, shorten the gate voltage rise time.Thus utilize the drive circuit that the present invention realizes as seen, there is again the universal applicability to dissimilar power tube while improving EMI performance.
As shown in Figure 8, the opening process of external power tube can be divided into 3 stages, wherein, stage 1 and 3 is gate charges with big current, and the stage 2, the part namely between the slope-inversion point A of VGATE and flex point B, adopts current source I1 to be the gate charges of external power tube, that is: the stage 2 is used to the di/dt(slope of the drain terminal electric current controlling external power tube), improve EMI performance to reach.
See also Fig. 9, described slope-inversion point detecting unit 111 comprises analog to digital converter 1111, latch 1112, digital comparator 1113 and digital to analog converter 1114, when outside pwm control signal is high level by low transition, the grid voltage of external power tube starts to rise, detect the grid voltage of external power tube in real time by analog to digital converter 1111 and be converted to digital signal, the digital signal in this cycle is input to the in-phase input end of described digital comparator 1113, simultaneously, digital to analog converter 1114 is by digital signal input latch 1112, the input signal of the inverting input of digital comparator 1113 is made to be the sample conversion signal in the last cycle of analog to digital converter 1111 pairs of grid voltages, the grid voltage in this cycle and the grid voltage in last cycle compare by described digital comparator 1113, export corresponding low and high level signal to export in control unit 113 after described digital to analog converter 1114 is converted to analog signal.
Further, described slope-inversion point detecting unit 111 also comprises the 4th buffer 1115, the output of the input linking number weighted-voltage D/A converter 1114 of described 4th buffer 1115, the first input end of the output connection control unit 113 of the 4th buffer 1115.
Described analog to digital converter 1111 is high-speed AD converter 1111, digital to analog converter 1114 should be high-speed A/D converter 1114 mutually.The input of described analog to digital converter 1111 connects the grid of external power tube, first output of analog to digital converter 1111 connects the inverting input of digital comparator 1113 by latch 1112, second output of analog to digital converter 1111 connects the in-phase input end of digital comparator 1113, and the output of digital comparator 1113 is successively by digital to analog converter 1114 and the 4th buffer 1115 connection control unit 113.
When the outside pwm control signal of input driving circuit is high level by low transition, the gate voltage signal GATE of external power tube starts to rise, now analog to digital converter 1111 starts detect in real time GATE analog signal and be converted to digital signal, the digital signal in this cycle is input to the in-phase input end of described digital comparator 1113 simultaneously, and the inverting input of digital comparator 1113 connect the sample conversion signal that Vn signal is 1111 pairs of GATE signal last cycles of described analog to digital converter, and the signal Vn in last cycle is latched by the sampled signal of described latch 1112 to the last cycle, the output signal Vcmp of digital comparator 1113 obtains Vout signal through described 4th buffer 1115 buffering after described digital to analog converter 1114 is converted to analog signal, in output control unit 113.
As shown in Figure 8, when time zone t1, VGATE signal is in ascent stage, now the in-phase end input signal Vm of described digital comparator 1113 is higher than end of oppisite phase input signal Vn, output signal Vcmp is high level, when VGATE signal rises to the flex point A shown in Fig. 8 gradually, because VGATE signal enters Miller land regions and its voltage remains unchanged and even can decline, now the output signal Vout of slope-inversion point detecting unit 111 is by high step-down, and judge to think that first slope-inversion point has appearred in the grid voltage VGATE of external power tube, i.e. A point; When time zone t2, the output signal Vout of slope-inversion point detecting unit 111 remains low, then slope-inversion point detecting unit 111 judges and thinks that the grid voltage VGATE slope of external power tube does not change; The t3 incipient stage is terminated at time zone t2, grid voltage VGATE due to external power tube starts to rise again, now the output signal Vout of slope-inversion point detecting unit 111 can uprise level by low level at once, slope-inversion point detecting unit 111 judges and thinks that second slope-inversion point has appearred in the grid voltage VGATE of external power tube this moment, i.e. B point.It can thus be appreciated that, slope-inversion point detecting unit 111 mainly completes the detection of scope discontinuity A and B of the grid voltage VGATE to external power tube, and outputed signal Vout and be input in control unit 113, be used for the conducting of control first switching tube and cut-off further, and then control the charge and discharge control of grid voltage of external power tube, and the slop control of grid voltage.
The present invention is also corresponding provides a kind of power tube control system, as shown in Figure 7, comprise inductance L 1, external power tube M1 and drive circuit 10, the grid of described external power tube M1 connects described drive circuit 10, the drain electrode of described external power tube M1 connects VIN feeder ear by described inductance L 1, the source ground of described external power tube M1.Described external power tube M1 has three parasitic capacitances, is respectively grid source electric capacity C2, gate leakage capacitance C1 and drain source capacitance C3.Because the improvement EMI capability-mode of power tube control system and versatility have been described in detail above.
In sum, the present invention is detected the slope significant change point of the grid voltage of external power tube by slope-inversion point detecting unit, achieve the control of drain current slope (di/dt) when external power tube being opened when outside pwm control signal is high level, reach and improve EMI performance and do not increase again extra loss function, when pwm signal is low level, external power tube is turned off rapidly, does not increase extra turn-off power loss.And for different power tubes, the present invention still can detect the slope-inversion point of the gate source voltage of external power tube automatically, reach the universal applicability to different model power tube.And conventional is conventional electronic component, realizes cost low.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the present invention.
Claims (6)
1. one kind for driving the drive circuit of external power tube, it is characterized in that, comprise power tube and open driver module and power tube shutoff driver module, described power tube is opened driver module and is comprised slope-inversion point detecting unit, control unit, the first switching tube, second switch pipe and current source, and described power tube turns off driver module and comprises inverter and the 3rd switching tube, when outside pwm control signal is high level, second switch pipe closes, described slope-inversion point detecting unit detects the slope variation of the grid voltage of external power tube, when the change slope of grid voltage is before the first slope-inversion point, control unit makes the first switching tube close, the gate charges of external power tube is given by the first switching tube and current source, when the change slope of grid voltage is between the first slope-inversion point and the second slope-inversion point, control unit makes the first switching tube disconnect, the first switching tube is made to stop to the gate charges of external power tube, when the change slope of grid voltage is after the second slope-inversion point, control unit makes the first switching tube close, make the first switching tube again to the gate charges of external power tube, when outside pwm control signal is low level, the first switching tube and second switch pipe all disconnect, the 3rd switching tube closes, and make the gate discharge of external power tube.
2. according to claim 1ly it is characterized in that for driving the drive circuit of external power tube, described power tube is opened driver module and is also comprised the first buffer and the second buffer, and described power tube is closed driver module and also comprised the 3rd buffer; The input of described slope-inversion point detecting unit connects the grid of external power tube, the first input end of the output connection control unit of slope-inversion point detecting unit, and the output of control unit connects the grid of the first switching tube by the first buffer; The input of the second buffer connects the second input of outside pwm control signal output and control unit, and the output of the second buffer connects the grid of second switch pipe; The drain electrode of the first switching tube is connect driving voltage feeder ear, is also connected the drain electrode of second switch pipe by current source, and the source electrode of the first switching tube is connected the grid of external power tube with the source electrode of second switch pipe; The input of described inverter connects outside pwm control signal output, the output of inverter connects the grid of the 3rd switching tube by the 3rd buffer, the drain electrode of the 3rd switching tube connects the source electrode of the first switching tube, the source electrode of second switch pipe and the grid being connected external power tube, the source ground of the 3rd switching tube.
3. according to claim 1 for driving the drive circuit of external power tube, it is characterized in that, described slope-inversion point detecting unit comprises analog to digital converter, latch, digital comparator and digital to analog converter, when outside pwm control signal is high level by low transition, the grid voltage of external power tube starts to rise, detect the grid voltage of external power tube in real time by analog to digital converter and be converted to digital signal, the digital signal in this cycle is input to the in-phase input end of described digital comparator, simultaneously, digital to analog converter is by digital signal input latch, the input signal of the inverting input of digital comparator is made to be the sample conversion signal of analog to digital converter to the last cycle of grid voltage, the grid voltage in this cycle and the grid voltage in last cycle compare by described digital comparator, export corresponding low and high level signal to be converted to after analog signal through described digital to analog converter and to export in control unit.
4. according to claim 3 for driving the drive circuit of external power tube, it is characterized in that, described slope-inversion point detecting unit also comprises the 4th buffer, the output of the input linking number weighted-voltage D/A converter of described 4th buffer, the first input end of the output connection control unit of the 4th buffer.
5. according to claim 1ly it is characterized in that for driving the drive circuit of external power tube, described first switching tube, second switch pipe and the 3rd switching tube are NMOS tube.
6. a power tube control system, it is characterized in that, comprise: inductance, external power tube and the drive circuit as described in claim 1-5 any one, the grid of described external power tube connects described drive circuit, the drain electrode of described external power tube connects VIN feeder ear by described inductance, the source ground of described external power tube.
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| CN113655358A (en) * | 2021-07-13 | 2021-11-16 | 上海艾为电子技术股份有限公司 | Test circuit and power protection chip of power tube |
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| CN111865054B (en) * | 2020-06-23 | 2022-02-11 | 华源智信半导体(深圳)有限公司 | Dynamic driving method and circuit based on grid voltage detection and switch converter |
| CN111865054A (en) * | 2020-06-23 | 2020-10-30 | 华源智信半导体(深圳)有限公司 | Dynamic driving method and circuit based on grid voltage detection and switch converter |
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| CN112134548B (en) * | 2020-08-20 | 2024-03-15 | 上海艾为电子技术股份有限公司 | Driving device, control method thereof and electronic equipment |
| CN112531675A (en) * | 2020-12-10 | 2021-03-19 | 基合半导体（宁波）有限公司 | Drive chip and drive system |
| CN112233714A (en) * | 2020-12-11 | 2021-01-15 | 深圳市芯天下技术有限公司 | Data output drive circuit and nonvolatile flash memory |
| CN112233714B (en) * | 2020-12-11 | 2021-04-16 | 深圳市芯天下技术有限公司 | Data output drive circuit and nonvolatile flash memory |
| CN113655358A (en) * | 2021-07-13 | 2021-11-16 | 上海艾为电子技术股份有限公司 | Test circuit and power protection chip of power tube |
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