Driving circuit of BOOST circuit and power tube

Abstract

The invention provides a driving circuit of a BOOST circuit and a power tube, the driving circuit comprises a slow charging driving unit and a fast charging driving unit, the fast charging driving unit comprises at least one of a first fast charging driving subunit, a second fast charging driving subunit and a third fast charging driving subunit; the slow charging driving unit is used for outputting a slow charging driving signal to the grid electrode of the power tube; the first fast charge driving subunit is used for outputting a first fast charge driving signal to the grid electrode of the power tube; the second fast charge driving subunit is used for outputting a second fast charge driving signal to the grid electrode of the power tube; the third fast charging driving subunit is used for outputting a third fast charging driving signal to the grid electrode of the power tube, the first fast charging driving subunit outputs a first fast charging driving signal as a transistor, and the second fast charging driving subunit outputs a second fast charging driving signal as a triode; the problem that the overground glitch voltage of an existing driving circuit is too high, so that the performance of a BOOST circuit is affected badly is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a BOOST voltage-boosting circuit and a driving circuit for a power tube. Background Art

[0002] The BOOST boost circuit is a switching DC boost circuit that can convert the input voltage into a higher output voltage. Due to its high output efficiency, good stability and boost capability, the BOOST boost circuit is considered the first choice for power supply systems in automotive electronic equipment, used to convert battery voltage into a higher voltage to meet the high voltage requirements of automotive electronic equipment.

[0003] The drive circuit is an essential part of the BOOST boost circuit. However, the existing commonly used drive circuit technology also brings a negative impact, that is, the ground glitch voltage is too high. A large ground glitch voltage will not only affect the performance of the BOOST boost circuit, but also cause a latch effect in severe cases, causing permanent damage to the chip. Summary of the invention

[0004] In this regard, the present application provides a BOOST boost circuit and a power tube driving circuit to solve the problem that the high ground burr voltage of the existing driving circuit has an adverse effect on the performance of the BOOST boost circuit.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] In a first aspect, the present application discloses a driving circuit of a power tube, including: a slow charging driving unit and a fast charging driving unit, wherein the fast charging driving unit includes at least one of a first fast charging driving sub-unit, a second fast charging driving sub-unit and a third fast charging driving sub-unit;

[0007] The slow charge driving unit is used to output a slow charge driving signal to the gate of the power tube according to an input signal and a power supply signal;

[0008] The first fast charge driving subunit is used to output a first fast charge driving signal to the gate of the power tube according to the drain signal of the power tube and the power signal;

[0009] The second fast charge driving sub-unit is used to output a second fast charge driving signal to the gate of the power tube according to the drain signal of the power tube and the power supply signal;

[0010] The third fast charge driving sub-unit is used to output a third fast charge driving signal to the gate of the power tube according to the inverted signal of the input signal, the drain signal of the power tube and the power signal;

[0011] Among them, the first fast charging driving subunit outputs the first fast charging driving signal through a transistor, and the second fast charging driving subunit outputs the second fast charging driving signal through a triode.

[0012] Optionally, in the above-mentioned driving circuit of the power tube, the slow charging driving unit is used to control the on and off of the transistor in itself according to the input signal and the power supply signal, and output the slow charging driving signal;

[0013] Wherein, the input signal is at a high level, and the buffer charge driving signal is output.

[0014] Optionally, in the above-mentioned driving circuit of the power tube, the slow charging driving unit includes: a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor and a first resistor;

[0015] The gate of the first transistor is connected to the gate of the second transistor, and the connection point serves as a first input terminal of the buffer charge driving unit to receive the input signal;

[0016] The source of the first transistor is connected to the source of the third transistor, the source of the fifth transistor and one end of the first resistor respectively, and the connection point serves as the second input end of the buffer charge driving unit to receive the power signal;

[0017] The drain of the first transistor is connected to the drain of the second transistor, the gate of the third transistor and the gate of the fourth transistor respectively;

[0018] The drain of the third transistor is connected to the drain of the fourth transistor, the gate of the fifth transistor and the gate of the sixth transistor respectively;

[0019] The drain of the fifth transistor is respectively connected to the drain of the sixth transistor, the gate of the seventh transistor and the gate of the eighth transistor;

[0020] The source of the seventh transistor is connected to the other end of the first resistor, the drain of the seventh transistor is connected to the drain of the eighth transistor, and the connection point serves as the output end of the slow charge driving unit to output the slow charge driving signal;

[0021] The source of the second transistor, the source of the fourth transistor, the source of the sixth transistor and the source of the eighth transistor are connected, and a connection point is grounded.

[0022] Optionally, in the above-mentioned driving circuit of the power tube, the first fast charge driving sub-unit is used to control the on and off of the transistor in itself according to the drain signal of the power tube and the power supply signal, and output the first fast charge driving signal;

[0023] Among them, when a falling edge occurs in the drain signal of the power tube, the transistor in the first fast charging driving sub-unit itself is turned on, and the first fast charging driving signal is output.

[0024] Optionally, in the above-mentioned driving circuit of the power tube, the first fast charge driving subunit includes: a ninth transistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode and a first capacitor;

[0025] One end of the first capacitor serves as a first input end of the first fast charge driving sub-unit to receive the drain signal of the power tube, and the other end of the first capacitor is connected to one end of the fifth resistor;

[0026] The other end of the fifth resistor is connected to one end of the fourth resistor and the anode of the first diode respectively, and the cathode of the first diode is connected to one end of the third resistor;

[0027] The other end of the fourth resistor is connected to one end of the second resistor and the gate of the ninth transistor respectively;

[0028] The other end of the third resistor is connected to the other end of the second resistor and the source of the ninth transistor respectively, and the connection point serves as the second input end of the first fast charge driving sub-unit to receive the power signal;

[0029] The drain of the ninth transistor serves as an output end of the first fast charge driving subunit to output the first fast charge driving signal.

[0030] Optionally, in the above-mentioned driving circuit of the power tube, the second fast charge driving sub-unit is used to control the on and off of the triode in itself according to the drain signal of the power tube and the power supply signal, and output the second fast charge driving signal;

[0031] Among them, when a falling edge appears in the drain signal of the power tube, the transistor in the second fast charging driving sub-unit itself is turned on, and the second fast charging driving signal is output.

[0032] Optionally, in the above-mentioned driving circuit of the power tube, the second fast charge driving subunit includes: a tenth transistor, the triode, a sixth resistor and a second capacitor;

[0033] One end of the second capacitor serves as the first input end of the second fast charge driving sub-unit to receive the drain signal of the power tube, and the other end of the second capacitor is respectively connected to one end of the sixth resistor, the drain of the tenth transistor and the base of the triode;

[0034] The other end of the sixth resistor is respectively connected to the source of the tenth transistor, the gate of the tenth transistor and the emitter of the triode, and the connection point serves as the second input end of the second fast charge driving sub-unit to receive the power signal;

[0035] The collector of the transistor serves as the output end of the second fast charge driving subunit to output the second fast charge driving signal.

[0036] Optionally, in the above-mentioned driving circuit of the power tube, the third fast charging driving sub-unit is used to control the on and off of the transistor in itself according to the inverted signal of the input signal, the drain signal of the power tube and the power supply signal, and output the third fast charging driving signal;

[0037] Among them, when a falling edge occurs in the drain signal of the power tube, the transistor in the third fast charging driving sub-unit itself is turned on, and the third fast charging driving signal is output.

[0038] Optionally, in the above-mentioned driving circuit of the power tube, the third fast charging driving subunit includes: an eleventh transistor, a twelfth transistor, a thirteenth transistor, a fourteenth transistor, a fifteenth transistor, a seventh resistor, an eighth resistor, a ninth resistor, a trigger, a NOR gate and an inverter;

[0039] One end of the seventh resistor serves as the first input end of the third fast charge driving sub-unit to receive the drain signal of the power tube, and the other end of the seventh resistor is connected to the drain of the eleventh transistor;

[0040] The gate of the eleventh transistor is connected to one end of the eighth resistor, and the other end of the eighth resistor is respectively connected to the gate of the twelfth transistor, the source of the twelfth transistor and one end of the ninth resistor, and the connection point serves as the second input end of the third fast charge driving sub-unit to receive the power signal;

[0041] The source of the eleventh transistor is respectively connected to the drain of the twelfth transistor, the other end of the ninth resistor and the input end of the trigger;

[0042] The output end of the trigger is connected to the first input end of the NOR gate, the second input end of the NOR gate serves as the third input end of the third fast charge driving sub-unit to receive the inverted signal of the input signal, and the output end of the NOR gate is connected to the input end of the inverter;

[0043] The output end of the inverter is connected to the gate of the thirteenth transistor and the gate of the fifteenth transistor respectively;

[0044] The source of the thirteenth transistor serves as a fourth input terminal of the third fast charge driving sub-unit to receive the power signal;

[0045] The drain of the fifteenth transistor is connected to the gate of the fourteenth transistor and the drain of the fourteenth transistor, and the source of the fifteenth transistor is grounded;

[0046] The drain of the thirteenth transistor is connected to the source of the fourteenth transistor, and the connection point serves as the output end of the third fast charging driving sub-unit to output the third fast charging driving signal.

[0047] The second aspect of the present application discloses a BOOST boost circuit, comprising: an inductor, a capacitor, a resistor, a diode and a power tube;

[0048] One end of the inductor is connected to the power supply voltage input signal, and the other end of the inductor is respectively connected to the anode of the diode and the drain of the power tube; the cathode of the diode is respectively connected to one end of the resistor and one end of the capacitor, and the connection point outputs the power supply voltage output signal; the source of the power tube is respectively connected to the other end of the capacitor and the other end of the resistor, and the connection point is grounded;

[0049] The gate of the power tube is provided with a driving circuit of the power tube as disclosed in any one of the first aspects.

[0050] The present invention provides a driving circuit of a power tube, including: a slow charging driving unit and a fast charging driving unit, the fast charging driving unit including at least one of a first fast charging driving subunit, a second fast charging driving subunit and a third fast charging driving subunit; the slow charging driving unit is used to output a slow charging driving signal to the gate of the power tube according to an input signal and a power supply signal; the first fast charging driving subunit is used to output a first fast charging driving signal to the gate of the power tube according to a drain signal and a power supply signal of the power tube; the second fast charging driving subunit is used to output a second fast charging driving signal to the gate of the power tube according to the drain signal and the power supply signal of the power tube; the third fast charging driving subunit is used to output a second fast charging driving signal to the gate of the power tube according to the drain signal and the power supply signal of the power tube; The driving subunit is used to output a third fast charging driving signal to the gate of the power tube according to the inverted signal of the input signal, the drain signal of the power tube and the power supply signal. The first fast charging driving subunit outputs the first fast charging driving signal as a transistor, and the second fast charging driving subunit outputs the second fast charging driving signal as a triode. Since the slow charging driving unit can avoid sudden current changes on the power tube, and the fast driving unit can control the rapid rise of the gate potential of the power tube, sufficient driving capability can be ensured while reducing the ground glitch voltage, solving the problem that the high ground glitch voltage in the existing driving circuit has an adverse effect on the performance of the BOOST boost circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0052] Figure 1 A schematic diagram of an existing BOOST boost circuit provided in an embodiment of the present application;

[0053] Figure 2 A schematic diagram of an existing power tube driving circuit provided in an embodiment of the present application;

[0054] Figure 3 A schematic diagram of the structure of a power tube driving circuit provided in an embodiment of the present application;

[0055] Figure 4 A circuit diagram of a power tube driving circuit provided in an embodiment of the present application;

[0056] Figure 5 A time domain waveform diagram of an input signal corresponding to a driving circuit of a power tube and a control signal of the power tube provided in an embodiment of the present application;

[0057] Figure 6 A time domain waveform comparison diagram provided in an embodiment of the present application;

[0058] Figure 7 A schematic diagram of a BOOST boost circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] like Figure 1 As shown in the figure, in order to ensure that the output power can provide sufficient load capacity in the BOOST boost circuit, the area of ​​the power tube is usually very large, so a large current is required to drive the power tube on and off, and a simple logic signal cannot drive the power tube. The main purpose of the drive circuit is to improve the driving ability of the logic signal so that the power tube can be turned on and off faster.

[0061] In the existing BOOST boost circuits, most use a multi-stage cascade of inverters with gradually increasing sizes to drive the gate of the power tube, such as Figure 2 As shown. Figure 2 The driving method shown can provide sufficient driving capability, but due to the gradual enhancement of the inverter driving capability, the edge time of the control signal (Vout) of the power tube will be very short, that is, the flipping speed of the control signal is very fast, which will cause a sudden change in the current in the power tube. Since there is a parasitic inductance on the bonding line (chip bonding wire) between the ground inside the chip of the power tube and the ground of the PCB board, the sudden change in current will generate a glitch voltage on the parasitic inductance. Excessive glitch voltage will affect the performance of the analog circuit. In severe cases, it will cause a latch effect, causing permanent damage to the chip of the power tube.

[0062] Based on this, the present application provides a BOOST boost circuit and a power tube driving circuit to solve the problem that the high ground burr voltage of the existing driving circuit has an adverse effect on the performance of the BOOST boost circuit.

[0063] See also Figure 3 The driving circuit of the power tube mainly includes: a slow charging driving unit 101 and a fast charging driving unit 102, and the fast charging driving unit includes at least one of a first fast charging driving subunit 1021, a second fast charging driving subunit 1022 and a third fast charging driving subunit 1023;

[0064] The slow charging driving unit 101 is used to Figure 4 Vin) and power signal ( Figure 4 AVDD in the output buffer charging drive signal to the gate of the power tube;

[0065] In practical applications, the power supply signal may be an analog voltage signal, which is mainly used to supply power to transistors and triodes in the driving circuit to realize the driving function of the power tube.

[0066] It should be noted that the slow charge driving unit 101 can be used to control the on and off of the transistor in itself according to the input signal and the power supply signal, and output the slow charge driving signal; wherein, the input signal is a high level, and the slow charge driving signal is output.

[0067] In some embodiments, Figure 4 As shown, the slow charge driving unit 101 mainly includes: a first transistor PM1, a second transistor NM1, a third transistor PM2, a fourth transistor NM2, a fifth transistor PM3, a sixth transistor NM3, a seventh transistor PM4, an eighth transistor NM4 and a first resistor R1;

[0068] The gate of the first transistor PM1 is connected to the gate of the second transistor NM1, and the connection point serves as a first input terminal of the buffer charge driving unit 101 to receive an input signal;

[0069] The source of the first transistor PM1 is connected to the source of the third transistor PM2, the source of the fifth transistor PM3 and one end of the first resistor R1 respectively, and the connection point serves as the second input end of the slow charge driving unit 101 to receive the power signal;

[0070] The drain of the first transistor PM1 is connected to the drain of the second transistor NM1, the gate of the third transistor PM2 and the gate of the fourth transistor NM2 respectively;

[0071] The drain of the third transistor PM2 is connected to the drain of the fourth transistor NM2, the gate of the fifth transistor PM3 and the gate of the sixth transistor NM3 respectively;

[0072] The drain of the fifth transistor PM3 is respectively connected to the drain of the sixth transistor NM3, the gate of the seventh transistor PM4 and the gate of the eighth transistor NM4;

[0073] The source of the seventh transistor PM4 is connected to the other end of the first resistor R1, the drain of the seventh transistor PM4 is connected to the drain of the eighth transistor NM4, and the connection point serves as the output end of the slow charge driving unit 101 to output the slow charge driving signal;

[0074] The source of the second transistor NM1 , the source of the fourth transistor NM2 , the source of the sixth transistor NM3 , and the source of the eighth transistor NM4 are connected, and a connection point is grounded.

[0075] In actual applications, the first transistor PM1, the third transistor PM2, the fifth transistor PM3 and the seventh transistor PM4 are PMOS transistors; the second transistor NM1, the fourth transistor NM2, the sixth transistor NM3 and the eighth transistor NM4 are NMOS transistors; of course, it is not limited to this, and can also be determined according to the application environment and user needs, all within the protection scope of this application.

[0076] It should be noted that the input signal is generally a PWM pulse signal. When the input signal jumps from "0" to "1", that is, from a low level to a high level, the gate voltage of the first transistor PM1, the second transistor NM1, the fifth transistor PM3 and the sixth transistor NM3 jumps to "1", and the gate voltage of the third transistor PM2, the fourth transistor NM2, the seventh transistor PM4 and the eighth transistor NM4 jumps to "0", that is, the gate voltage of the first transistor PM1, the second transistor NM1, the fifth transistor PM3 and the sixth transistor NM3 becomes a high level, the gate voltage of the third transistor PM2, the fourth transistor NM2, the seventh transistor PM4 and the eighth transistor NM4 becomes a low level, the seventh transistor PM4 is turned on, and the power signal is converted into a slow charging drive signal through the branch of the first resistor R1 and the seventh transistor PM4 to charge the gate of the power tube. Since the current charging the gate of the power tube through the branch of the first resistor R1 and the seventh transistor PM4 is small, the gate potential of the power tube will rise slowly. When the gate potential is high enough to turn on the power tube, the drain signal of the power tube will be pulled down to the ground, that is, the drain signal of the power tube will have a falling edge.

[0077] Specifically, the branch formed by the first resistor R1 and the seventh transistor PM4 will charge the gate capacitance of the power tube, so that the gate potential of the power tube increases slowly.

[0078] It should also be noted that, since the seventh transistor PM4 and the eighth transistor NM4 are transistors that finally output the slow charge drive signal, their volume and size are slightly larger than other transistors, in order to increase the driving capability of their gates, the first transistor PM1, the second transistor NM1, the third transistor PM2, the fourth transistor NM2, the fifth transistor PM3, and the sixth transistor NM3 arranged in the front stage thereof constitute a three-stage drive circuit. Among them, the first transistor PM1 and the second transistor NM1 constitute a first-stage drive circuit, the third transistor PM2 and the fourth transistor NM2 constitute a second-stage drive circuit, and the fifth transistor PM3 and the sixth transistor NM3 constitute a third-stage drive circuit.

[0079] In practical applications, in addition to driving the seventh transistor PM4 and the eighth transistor NM4 of the subsequent stage, the first transistor PM1 and the second transistor NM1 can also obtain an inverted signal of the input signal through the first transistor PM1 and the second transistor NM1 to provide a corresponding control signal for the third fast charging driving subunit 1023.

[0080] The first fast charge driving subunit 1021 is used to generate a signal according to the drain signal of the power tube ( Figure 1 and Figure 4 L1H in the figure) and the power supply signal output a first fast charge drive signal to the gate of the power tube;

[0081] In actual applications, the first fast charging driving subunit 1021 can be used to control the on and off of the transistor in itself according to the drain signal of the power tube and the power supply signal, and output the first fast charging driving signal; wherein, when the drain signal of the power tube has a falling edge, the transistor in the first fast charging driving subunit 1021 itself is turned on, and the first fast charging driving signal is output.

[0082] In some embodiments, Figure 4 As shown, the first fast charge driving subunit 1021 may include: a ninth transistor PM7, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first diode D1 and a first capacitor C1;

[0083] One end of the first capacitor C1 is used as the first input end of the first fast charge driving sub-unit 1021 to receive the drain signal of the power tube, and the other end of the first capacitor C1 is connected to one end of the fifth resistor R5;

[0084] The other end of the fifth resistor R5 is connected to one end of the fourth resistor R4 and the anode of the first diode D1 respectively, and the cathode of the first diode D1 is connected to one end of the third resistor R3;

[0085] The other end of the fourth resistor R4 is connected to one end of the second resistor R2 and the gate of the ninth transistor PM7 respectively;

[0086] The other end of the third resistor R3 is connected to the other end of the second resistor R2 and the source of the ninth transistor PM7 respectively, and the connection point serves as the second input end of the first fast charge driving sub-unit 1021 to receive the power signal;

[0087] The drain of the ninth transistor PM7 serves as the output terminal of the first fast charge driving sub-unit 1021 to output the first fast charge driving signal.

[0088] In practical applications, the ninth transistor PM7 can be a PMOS tube; of course, it is not limited to this, and can also be determined according to the application environment and user needs, all within the protection scope of this application.

[0089] It should be noted that when a falling edge appears in the drain signal of the power tube, that is, the jump of the drain signal of the power tube from "1" to "0" will be coupled to the gate of the ninth transistor PM7 through the first capacitor C1, causing the gate potential of the ninth transistor PM7 to also have a short decline process and then rise again. If the gate potential of the ninth transistor PM7 drops to a low enough level, low enough for the ninth transistor PM7 to turn on, the ninth transistor PM7 will have a very short conduction process. During this period of time, the power signal outputs the first fast charging drive signal through the drain of the ninth transistor PM7 to charge the gate of the power tube.

[0090] The second fast charge driving sub-unit 1022 is used to control the on and off of the transistor in itself according to the drain signal of the power tube and the power signal, and output the second fast charge driving signal to the gate of the power tube;

[0091] In actual applications, the second fast charging driving subunit 1022 can be used to control the on and off of the transistor in itself according to the drain signal of the power tube and the power supply signal, and output a second fast charging driving signal; wherein, when a falling edge appears in the drain signal of the power tube, the transistor in the second fast charging driving subunit 1022 itself is turned on, and the second fast charging driving signal is output.

[0092] In some embodiments, Figure 4 As shown, the second fast charge driving subunit 1022 may include: a tenth transistor PM8, a triode Q1, a sixth resistor R6 and a second capacitor C2;

[0093] One end of the second capacitor C2 is used as the first input end of the second fast charge driving sub-unit 1022 to receive the drain signal of the power tube, and the other end of the second capacitor C2 is respectively connected to one end of the sixth resistor R6, the drain of the tenth transistor PM8 and the base of the transistor Q1;

[0094] The other end of the sixth resistor R6 is respectively connected to the source of the tenth transistor PM8, the gate of the tenth transistor PM8 and the emitter of the transistor Q1, and the connection point serves as the second input end of the second fast charge driving sub-unit 1022 to receive the power signal;

[0095] The collector of the transistor Q1 serves as the output end of the second fast charge driving sub-unit 1022 to output the second fast charge driving signal.

[0096] In practical applications, the tenth transistor PM8 can be a PMOS tube; of course, it is not limited to this, and can also be determined according to the application environment and user needs, all within the protection scope of this application.

[0097] It should be noted that when a falling edge appears in the drain signal of the power tube, that is, the jump of the drain signal of the power tube from "1" to "0" will be coupled to the base of the transistor Q1 through the second capacitor C2, causing the base potential of the transistor Q1 to also have a short decline and then rise again. If the base potential of the transistor Q1 drops low enough, low enough for the transistor Q1 to turn on, the transistor Q1 will have a very short conduction process. During this period of time, the power signal outputs the second fast charging drive signal through the collector of the transistor Q1 to charge the gate of the power tube.

[0098] The third fast charge driving subunit 1023 is used to output a third fast charge driving signal to the gate of the power tube according to the inverted signal of the input signal, the drain signal of the power tube and the power supply signal.

[0099] In practical applications, the third fast charge driving subunit 1023 is used to control the on and off of the transistor in itself according to the inverted signal of the input signal, the drain signal of the power tube and the power supply signal, and output the third fast charge driving signal;

[0100] Among them, the drain signal of the power tube has a falling edge, the transistor in the third fast charging driving sub-unit 1023 itself is turned on, and the third fast charging driving signal is output.

[0101] In some embodiments, Figure 4 As shown, the third fast charge driving subunit 1023 may include: an eleventh transistor NM6, a twelfth transistor PM9, a thirteenth transistor PM5, a fourteenth transistor PM6, a fifteenth transistor NM5, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a trigger I1, a NOR gate I2 and an inverter I3;

[0102] One end of the seventh resistor R7 serves as the first input end of the third fast charge driving sub-unit 1023 to receive the drain signal of the power tube, and the other end of the seventh resistor R7 is connected to the drain of the eleventh transistor NM6;

[0103] The gate of the eleventh transistor NM6 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is respectively connected to the gate of the twelfth transistor PM9, the source of the twelfth transistor PM9 and one end of the ninth resistor R9, and the connection point serves as the second input end of the third fast charge driving sub-unit 1023 to receive the power signal;

[0104] The source of the eleventh transistor NM6 is respectively connected to the drain of the twelfth transistor PM9, the other end of the ninth resistor R9 and the input end of the trigger I1;

[0105] The output end of the trigger I1 is connected to the first input end of the NOR gate I2, the second input end of the NOR gate I2 serves as the third input end of the third fast charge driving sub-unit 1023 to receive the inverted signal of the input signal, and the output end of the NOR gate I2 is connected to the input end of the inverter I3;

[0106] The output terminal of the inverter I3 is connected to the gate of the thirteenth transistor PM5 and the gate of the fifteenth transistor NM5 respectively;

[0107] The source of the thirteenth transistor PM5 serves as a fourth input terminal of the third fast-charge driving sub-unit 1023 to receive a power signal;

[0108] The drain of the fifteenth transistor NM5 is connected to the gate of the fourteenth transistor PM6 and the drain of the fourteenth transistor PM6, and the source of the fifteenth transistor NM5 is grounded;

[0109] The drain of the thirteenth transistor PM5 is connected to the source of the fourteenth transistor PM6, and the connection point serves as the output end of the third fast charge driving sub-unit 1023 to output the third fast charge driving signal.

[0110] In practical applications, the eleventh transistor NM6 and the fifteenth transistor NM5 can be NMOS transistors, the twelfth transistor PM9, the thirteenth transistor and the fourteenth transistor PM6 can be PMOS transistors, and the trigger I1 can be a Schmitt trigger I1; of course, it is not limited to this, and can also be determined depending on the application environment and user needs, all within the protection scope of this application.

[0111] It should be noted that when a falling edge appears in the drain signal of the power tube, that is, when the drain signal of the power tube changes from "1" to "0", the potential of the output signal at the output end of the inverter I3 is 0, which can control the thirteenth transistor PM5 to turn on, and output the first fast charging drive signal through the drain of the thirteenth transistor PM5 to charge the gate of the power tube.

[0112] In combination with the above, the first fast charging driving subunit 1021, the second fast charging driving subunit 1022 and the third fast charging driving subunit 1023 in the fast charging driving unit 102 can all detect whether a falling edge occurs in the drain signal of the power tube, and when a falling edge is detected in the drain signal of the power tube, each fast charging driving subunit can generate a corresponding fast charging driving signal to quickly charge the gate of the power tube, thereby ensuring that the gate potential of the power tube can be quickly established.

[0113] Combined with the above, Figure 4 The process of the gate potential rising of the power tube in the driving circuit of the power tube shown can be divided into two stages: the first stage is charging through the slow charging driving unit 101, and the second stage is charging through the fast charging driving unit 102. Among them, charging through the slow charging driving unit 101 can avoid the sudden change of current on the power tube, and charging through the fast charging driving unit 102 can make the gate potential of the power tube rise quickly, ensuring sufficient driving capability.

[0114] It should be noted that, in combination with the power tube driving circuit provided above, in practice, during the design stage of the power tube driving circuit, the time proportion of the two charging stages can be reasonably designed to ensure that the duty cycle of the input signal of the power tube driving circuit meets the requirements and reduce the ground glitch voltage.

[0115] Through the working process of the above circuit, it is ensured that the driving circuit of the power tube can provide a sufficiently large current to drive the power tube during the high level period of the gate signal (control signal) of the power tube; at the same time, the rising edge time of the gate signal of the power tube is increased, avoiding the ground burr voltage process caused by the sudden change of the current on the power tube caused by the rapid flipping of the gate signal of the power tube.

[0116] For example, Figure 4 The corresponding time domain waveforms of the input signal and the control signal of the power tube are as follows: Figure 5 It is worth noting that, through relevant simulation tools, Figure 2 The conventional power tube driving circuit and Figure 4 The driving circuit of the power tube shown in the figure is simulated and compared. Figure 2 The ground burrs (green waveform) caused by the prior art and the Figure 4 The time domain waveform comparison of the ground spur (red waveform) caused by the technology proposed in this application is shown in FIG. Figure 6 As shown, it can be seen that the solution proposed in this application can effectively reduce ground burrs and improve the signal quality of analog circuits.

[0117] The driving circuit of the power tube provided in this embodiment includes: a slow charging driving unit 101 and a fast charging driving unit 102, wherein the fast charging driving unit 102 includes at least one of a first fast charging driving subunit 1021, a second fast charging driving subunit 1022 and a third fast charging driving subunit 1023; the slow charging driving unit 101 is used to output a slow charging driving signal to the gate of the power tube according to an input signal and a power signal; the first fast charging driving subunit 1021 is used to output a first fast charging driving signal to the gate of the power tube according to a drain signal and a power signal of the power tube; the second fast charging driving subunit 1022 is used to output a first fast charging driving signal to the gate of the power tube according to a drain signal and a power signal of the power tube Output the second fast charge drive signal to the gate of the power tube; the third fast charge drive subunit 1023 is used to output the third fast charge drive signal to the gate of the power tube according to the inverted signal of the input signal, the drain signal of the power tube and the power supply signal. Since the slow charge drive unit 101 can avoid the sudden change of current on the power tube, and the fast drive unit can control the rapid rise of the gate potential of the power tube, it ensures sufficient driving capability while increasing the edge time of the gate signal of the power tube, avoiding excessive ground glitch voltage caused by sudden change of current on the power tube, and solves the problem of excessive ground glitch voltage in the existing drive circuit causing adverse effects on the performance of the BOOST boost circuit.

[0118] Optionally, another embodiment of the present application further provides a BOOST boost circuit, see Figure 7 , mainly including: inductor L11, capacitor C11, resistor R11, diode D11 and power tube;

[0119] One end of the inductor L11 is connected to the power supply voltage input signal Vddin, and the other end of the inductor L11 is respectively connected to the anode of the diode D11 and the drain of the power tube; the cathode of the diode D11 is respectively connected to one end of the resistor R11 and one end of the capacitor C11, and the connection point outputs the power supply voltage output signal Vddout; the source of the power tube is respectively connected to the other end of the capacitor C11 and the other end of the resistor R11, and the connection point is grounded;

[0120] The gate of the power tube is provided with a driving circuit of the power tube as described in any of the above embodiments.

[0121] In practical applications, the BOOST boost circuit may be a circuit in a boost converter; of course, it is not limited thereto, and may also be determined based on the application environment and user needs, all within the protection scope of this application.

[0122] It is worth noting that with the widespread use of automobiles, users are also paying more and more attention to the safety of drivers and passengers during vehicle driving. Airbags are a passive safety protection system, which, when used in conjunction with seat belts, can provide effective anti-collision protection for passengers. The inventors have found that airbags require effective power supply to achieve normal working processes. How to provide a reliable power supply for airbags has become a technical problem that needs to be solved urgently.

[0123] In this regard, the BOOST boost circuit provided in the present application can be applied to the boost converter in the airbag power system to provide a reliable power supply for the airbag power system, thereby meeting the high voltage requirements of automotive electronics.

[0124] In summary, the BOOST boost circuit provided in this embodiment can ensure that the PWM pulse signal can effectively drive the power tube to be turned on and off, while effectively reducing the ground glitch voltage, thereby ensuring the normal function of the analog circuit and the quality of the output power supply.

[0125] It should be noted that, for the relevant description of the driving circuit of the power tube, please refer to the corresponding embodiment above, and this application will not go into details; for the relevant description of the BOOST boost circuit, please refer to the prior art, and this application will not go into details either.

[0126] The features recorded in the various embodiments in this specification can be replaced or combined with each other, and the same and similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work. Professionals can also further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented in electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0127] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0128] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A driving circuit for a power tube, characterized in that: include: A slow charging driving unit and a fast charging driving unit, wherein the fast charging driving unit includes at least one of a first fast charging driving sub-unit, a second fast charging driving sub-unit and a third fast charging driving sub-unit; The slow charge driving unit is used to output a slow charge driving signal to the gate of the power tube according to an input signal and a power supply signal; The first fast charge driving subunit is used to output a first fast charge driving signal to the gate of the power tube according to the drain signal of the power tube and the power signal; The second fast charge driving sub-unit is used to output a second fast charge driving signal to the gate of the power tube according to the drain signal of the power tube and the power supply signal; The third fast charge driving sub-unit is used to output a third fast charge driving signal to the gate of the power tube according to the inverted signal of the input signal, the drain signal of the power tube and the power signal; Among them, the first fast charging driving subunit outputs the first fast charging driving signal through a transistor, and the second fast charging driving subunit outputs the second fast charging driving signal through a triode.

2. The driving circuit of the power tube according to claim 1, characterized in that: The slow charge driving unit is used to control the on and off of the transistor in itself according to the input signal and the power supply signal, and output the slow charge driving signal; Wherein, the input signal is at a high level, and the buffer charge driving signal is output.

3. The driving circuit of the power tube according to claim 2, characterized in that: The slow charge driving unit includes: a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor and a first resistor; The gate of the first transistor is connected to the gate of the second transistor, and the connection point serves as a first input terminal of the buffer charge driving unit to receive the input signal; The source of the first transistor is connected to the source of the third transistor, the source of the fifth transistor and one end of the first resistor respectively, and the connection point serves as the second input end of the buffer charge driving unit to receive the power signal; The drain of the first transistor is connected to the drain of the second transistor, the gate of the third transistor and the gate of the fourth transistor respectively; The drain of the third transistor is connected to the drain of the fourth transistor, the gate of the fifth transistor and the gate of the sixth transistor respectively; The drain of the fifth transistor is respectively connected to the drain of the sixth transistor, the gate of the seventh transistor and the gate of the eighth transistor; The source of the seventh transistor is connected to the other end of the first resistor, the drain of the seventh transistor is connected to the drain of the eighth transistor, and the connection point serves as the output end of the slow charge driving unit to output the slow charge driving signal; The source of the second transistor, the source of the fourth transistor, the source of the sixth transistor and the source of the eighth transistor are connected, and a connection point is grounded.

4. The driving circuit of the power tube according to claim 1, characterized in that: The first fast charge driving sub-unit is used to control the on and off of the transistor in itself according to the drain signal of the power tube and the power supply signal, and output the first fast charge driving signal; Among them, when a falling edge occurs in the drain signal of the power tube, the transistor in the first fast charging driving sub-unit itself is turned on, and the first fast charging driving signal is output.

5. The driving circuit of the power tube according to claim 4, characterized in that: The first fast charge driving subunit includes: a ninth transistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode and a first capacitor; One end of the first capacitor serves as a first input end of the first fast charge driving sub-unit to receive the drain signal of the power tube, and the other end of the first capacitor is connected to one end of the fifth resistor; The other end of the fifth resistor is connected to one end of the fourth resistor and the anode of the first diode respectively, and the cathode of the first diode is connected to one end of the third resistor; The other end of the fourth resistor is connected to one end of the second resistor and the gate of the ninth transistor respectively; The other end of the third resistor is connected to the other end of the second resistor and the source of the ninth transistor respectively, and the connection point serves as the second input end of the first fast charge driving sub-unit to receive the power signal; The drain of the ninth transistor serves as an output end of the first fast charge driving subunit to output the first fast charge driving signal.

6. The driving circuit of the power tube according to claim 1, characterized in that: The second fast charge driving sub-unit is used to control the on and off of the transistor in itself according to the drain signal of the power tube and the power supply signal, and output the second fast charge driving signal; Among them, when a falling edge appears in the drain signal of the power tube, the transistor in the second fast charging driving sub-unit itself is turned on, and the second fast charging driving signal is output.

7. The driving circuit of the power tube according to claim 6, characterized in that: The second fast charge driving subunit includes: a tenth transistor, the triode, a sixth resistor and a second capacitor; One end of the second capacitor serves as the first input end of the second fast charge driving sub-unit to receive the drain signal of the power tube, and the other end of the second capacitor is respectively connected to one end of the sixth resistor, the drain of the tenth transistor and the base of the triode; The other end of the sixth resistor is respectively connected to the source of the tenth transistor, the gate of the tenth transistor and the emitter of the triode, and the connection point serves as the second input end of the second fast charge driving sub-unit to receive the power signal; The collector of the transistor serves as the output end of the second fast charge driving subunit to output the second fast charge driving signal.

8. The driving circuit of the power tube according to claim 1, characterized in that: The third fast charge driving sub-unit is used to control the on and off of the transistor in itself according to the inverted signal of the input signal, the drain signal of the power tube and the power supply signal, and output the third fast charge driving signal; Among them, when a falling edge occurs in the drain signal of the power tube, the transistor in the third fast charging driving sub-unit itself is turned on, and the third fast charging driving signal is output.

9. The driving circuit of the power tube according to claim 8, characterized in that: The third fast charge driving subunit includes: an eleventh transistor, a twelfth transistor, a thirteenth transistor, a fourteenth transistor, a fifteenth transistor, a seventh resistor, an eighth resistor, a ninth resistor, a trigger, a NOR gate, and an inverter; One end of the seventh resistor serves as the first input end of the third fast charge driving sub-unit to receive the drain signal of the power tube, and the other end of the seventh resistor is connected to the drain of the eleventh transistor; The gate of the eleventh transistor is connected to one end of the eighth resistor, and the other end of the eighth resistor is respectively connected to the gate of the twelfth transistor, the source of the twelfth transistor and one end of the ninth resistor, and the connection point serves as the second input end of the third fast charge driving sub-unit to receive the power signal; The source of the eleventh transistor is respectively connected to the drain of the twelfth transistor, the other end of the ninth resistor and the input end of the trigger; The output end of the trigger is connected to the first input end of the NOR gate, the second input end of the NOR gate serves as the third input end of the third fast charge driving sub-unit to receive the inverted signal of the input signal, and the output end of the NOR gate is connected to the input end of the inverter; The output end of the inverter is connected to the gate of the thirteenth transistor and the gate of the fifteenth transistor respectively; The source of the thirteenth transistor serves as a fourth input terminal of the third fast charge driving sub-unit to receive the power signal; The drain of the fifteenth transistor is connected to the gate of the fourteenth transistor and the drain of the fourteenth transistor, and the source of the fifteenth transistor is grounded; The drain of the thirteenth transistor is connected to the source of the fourteenth transistor, and the connection point serves as the output end of the third fast charging driving sub-unit to output the third fast charging driving signal.

10. A BOOST boost circuit, characterized in that: include: Inductors, capacitors, resistors, diodes and power tubes; One end of the inductor is connected to the power supply voltage input signal, and the other end of the inductor is respectively connected to the anode of the diode and the drain of the power tube; the cathode of the diode is respectively connected to one end of the resistor and one end of the capacitor, and the connection point outputs the power supply voltage output signal; the source of the power tube is respectively connected to the other end of the capacitor and the other end of the resistor, and the connection point is grounded; The gate of the power tube is provided with a driving circuit of the power tube as described in any one of claims 1-9.

Images