CN112187045A - Boock converter bootstrap drive circuit without negative current - Google Patents
Boock converter bootstrap drive circuit without negative current Download PDFInfo
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- CN112187045A CN112187045A CN202011011764.2A CN202011011764A CN112187045A CN 112187045 A CN112187045 A CN 112187045A CN 202011011764 A CN202011011764 A CN 202011011764A CN 112187045 A CN112187045 A CN 112187045A
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- 239000003990 capacitor Substances 0.000 claims description 36
- 238000004146 energy storage Methods 0.000 claims description 31
- 238000007493 shaping process Methods 0.000 claims description 19
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 description 19
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- 238000007599 discharging Methods 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a bootstrap drive circuit of a BUCK converter without negative current, which at least comprises a first switch tube, a second switch tube and a drive component for respectively driving the first switch tube, the second switch tube and a main switch tube in the BUCK converter, wherein the first switch tube and the second switch tube are connected in series, the drive component is configured to drive the main switch tube and the second switch tube based on a first drive signal and drive the first switch tube based on a second drive signal, and the first drive signal and the second drive signal are complementary to each other so as to avoid the first switch tube and the second switch tube from being conducted simultaneously or reduce the time for conducting the first switch tube and the second switch tube simultaneously.
Description
Technical Field
The invention relates to the technical field of switching power supplies of Buck topologies, in particular to a bootstrap drive circuit of a BUCK converter without negative current.
Background
The BUCK circuit is one of the most basic dc-dc converters in power electronics, and its development at present is very mature. Due to the advantages of simple topology, small number of elements, easy design of parameters and the like, the method is widely applied to various modern industrial products, such as military equipment, aerospace field, medical equipment, power equipment, communication equipment, LED drive, instruments and meters, industrial control equipment, some high-power consumer-grade electronic products or household appliances and the like.
As shown in fig. 3, a BUCK converter (i.e., BUCK circuit) generally includes a main switching transistor Q of MOS type1Freewheel diode D1Energy storage inductor L and output filter capacitor C2And an input filter capacitor C1. Input filter capacitor C1One side is connected with an input power supply. Output filter capacitor C2One side is connected with a load. The working principle of the BUCK converter is as follows:
main switch tube Q1Is controlled by the driving pulse output by the control circuit; when the control circuit pulse outputs high level, the main switch tube Q1Is turned on and freewheeling diode D1Is zero and the cathode voltage is the voltage of the input power supply, so that the freewheeling diode D1Reverse cut-off; the current of the input power supply flows through the energy storage inductor L and supplies power to the load, and the current of the energy storage inductor L gradually rises at the moment; self-inductance potential with a positive left end and a negative right end is generated at two ends of the energy storage inductor L to block the current from rising, and the energy storage inductor L converts the electric energy into magnetic energy to be stored. After the on-time, the control circuit pulse is low level, the main switch tube Q1The current in the energy storage inductor L can not suddenly change, and the self-inductance potential with the right end being positive and the left end being negative is generated at the two ends of the energy storage inductor L to block the current from dropping, so that the freewheeling diode D is enabled to be connected with the power supply1Forward biased conduction, so that the current in the energy storage inductor L flows to the freewheeling diode D1Forming a loop. At this time, the current value in the loop gradually decreases, and the magnetic energy stored in the energy storage inductor L is converted into electric energy and released to supply power to the load. After the turn-off time, the control circuit outputs high level by pulse, so that the main switching tube Q1Conducting and repeating the above process. The filter capacitor in the BUCK converter is used for reducing the fluctuation of the output voltage. Freewheeling diode D1Is an indispensable few element, if there is no such diode, the BUCK converter can not work normally, and the main switch tube Q1Situation of changing from on to offUnder the condition, the two ends of the energy storage inductor L generate high self-inductance potential to damage the main switch tube Q1. The BUCK converter has two working modes, and the BUCK converter is divided into an inductive current continuous working mode and an inductive current discontinuous working mode according to whether the L current of the energy storage inductor is continuous or not, namely whether the L current of the energy storage inductor starts from zero or not at the beginning of each pulse period.
However, for the basic diode freewheeling type BUCK circuit, the main switch tube Q is adopted1At high end, driving the main switch tube Q1It is necessary to establish a driving voltage with its source as a reference, but since Q is the main switch tube1The source potential of the switch changes continuously with the change of the switch state, which is not favorable for the design of the bootstrap driving circuit. At present, a commonly used driving circuit of a BUCK circuit is a bootstrap driving circuit, and a plurality of bootstrap driving components which are developed well are provided for designers to select, however, in order to enable the bootstrap driving circuit to be self-started, the bootstrap driving circuits need to be connected with an auxiliary power supply, a bootstrap capacitor often needs to be powered from a main power supply, and after a starting process is finished, the part of auxiliary circuit used for self-starting is used in working, so that power loss of a system is increased, and efficiency of the system is reduced. In addition, in some extreme application occasions such as low voltage or special load, the bootstrap drive circuit often can not complete self-starting, resulting in that the circuit can not work normally. Therefore, a driving circuit with low power consumption, low cost and effective self-start is needed to solve the above problems.
Chinese patent (publication No. CN108448886A) discloses a bootstrap drive circuit of a BUCK converter, as shown in fig. 4, including a main circuit, an auxiliary power supply, a control circuit, a driving component, a bootstrap circuit, and a bootstrap charging control circuit; the control circuit provides a signal square wave for the driving assembly, and the driving assembly outputs a corresponding driving signal to the main circuit and the bootstrap charging control circuit according to the signal square wave; the bootstrap circuit is connected with the driving component and provides corresponding level conversion for the driving output, and the bootstrap charging control circuit provides a charging loop for the bootstrap circuit. The bootstrap charging control circuit can be bootstrapped in the starting process of the circuitThe bootstrap capacitor in the circuit provides the charge circuit, realizes bootstrap circuit's self-starting function, and self-starting function does not receive the influence of load condition, and bootstrap charge control circuit just puts into operation when the system starts simultaneously, has avoided self-starting circuit's unconditional work, has reduced the loss of system, has promoted the efficiency of system. As shown in fig. 4 and 5, the auxiliary power supply of 12V, diode D3Bootstrap capacitor C2And a switching tube M2Resistance R1Diode D2Forming a bootstrap charging circuit by controlling the switch tube M2The on/off of the bootstrap capacitor is controlled to charge or not. However, the bootstrap driving circuit provided by the patent still has a certain leak, and when the energy storage inductor L in the BUCK converter works in the current continuous operation mode, the bootstrap driving circuit provided by the patent can be normally applied. However, when the load is light, the energy storage inductor L in the BUCK converter enters a current interruption mode, and at this time, the output filter capacitor discharges through the energy storage inductor L in the BUCK circuit and the added bootstrap charging loop to generate a large negative inductor current, which causes additional loss. Specifically, as shown in fig. 4 and 5, the switch tube M in fig. 52After conduction, the capacitor C on the output side1Energy storage inductor L and diode D2Resistance R1And a switching tube M2The formed loop is conducted. If the switch tube M2The conducting time is long, and the situation that the BUCK converter is in a current interrupted working mode is considered, at the moment, the situation that no current exists in the loop inevitably occurs, the voltage on the output side is higher than the voltage on the side of the switching tube, so that the capacitor on the output side discharges through the loop, the current reversely flows back, and the situation that the inductive current is negative occurs. If the negative-direction inductive current is too large, a large-current MOS tube needs to be selected for an MOS tube (switching tube) added in the bootstrap startup circuit, so that the cost is increased. Therefore, a bootstrap driving circuit is needed, which can eliminate the negative current in the bootstrap driving charging circuit of the BUCK converter, reduce the loss, and reduce the capacity of the MOS transistor, thereby reducing the circuit cost.
Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a bootstrap drive circuit of a BUCK converter without negative current, which at least comprises a first switch tube Q2A second switch tube Q3And driving the first switching tubes Q respectively2A second switch tube Q3Main switch tube Q in BUCK converter1The drive assembly of (1). Preferably, the driving component may be a driving chip, a driving circuit, or the like. The first switch tube Q2And the second switch tube Q3Are connected in series with each other. The driving component is configured to drive the main switching tube Q based on a first driving signal1And a second switching tube Q3. The driving component is configured to drive the first switch tube Q based on a second driving signal2. The first driving signal and the second driving signal are complementary to each other to avoid the first switch tube Q2And the second switch tube Q3And is simultaneously turned on. Or reducing the first switch tube Q2And the second switch tube Q3The time of simultaneous conduction.
The invention also provides a bootstrap drive circuit of the BUCK converter without negative current, which at least comprises a first switching tube Q2A first diode D2 and a driving component. Preferably, the driving component may be a driving chip, a driving circuit, or the like. The bootstrap drive circuit is further provided with a first diode D2 and a first switch tube Q2Second switch tube Q connected in series3. The driving component is configured to drive a main switching tube Q of the BUCK converter based on a first driving signal1And a second switching tube Q3. The driving component is configured to drive the first switch tube Q based on a second driving signal2. The first drive signal and the second drive signalThe amplitudes of (a) and (b) are added to each other to be constant.
The invention also provides a bootstrap drive circuit of the BUCK converter without negative current, which at least comprises a first diode D2 and a first switch tube Q which are connected in series2A second switch tube Q3And a drive assembly. Preferably, the driving component may be a driving chip, a driving circuit, or the like. The driving component is configured to drive a main switching tube Q of the BUCK converter based on a first driving signal1And a second switching tube Q3. The driving component is configured to drive the first switch tube Q based on a second driving signal2. The first drive signal and the second drive signal are complementary to each other.
The invention also provides a bootstrap drive circuit of the BUCK converter without negative current, which at least comprises a first diode D2 and a first switch tube Q which are connected in series2A second switch tube Q3And a drive assembly. Preferably, the driving component may be a driving chip, a driving circuit, or the like. The driving component is configured to drive a main switching tube Q of the BUCK converter based on a first driving signal1And a second switching tube Q3. The driving component is configured to drive the first switch tube Q based on a second driving signal2. The first drive signal and the second drive signal are complementary to each other. The first driving signal passes through a shaping circuit and the main switching tube Q1And (4) connecting.
According to a preferred embodiment, the second switching tube Q3And a main switching tube Q of the BUCK converter1Is connected to the source of (a). The first switch tube Q2Is grounded.
According to a preferred embodiment, the BUCK converter comprises at least a freewheeling diode D1Energy storage inductor L and output filter capacitor C2. The freewheeling diode D1Are connected in parallel with the bootstrap charging branch of the bootstrap driving circuit. The bootstrap charging branch circuit is at least composed of the first diode D2 and the first switch tube Q2And a second switching tube Q3And (4) forming.
According to a preferred embodiment, the bootstrap drive circuitThe circuit also includes a bootstrap capacitor C3Auxiliary power supply VCCAnd a second diode D3. The bootstrap capacitor C3Auxiliary power supply VCCA second diode D3A first diode D2, a first switch tube Q2And a second switching tube Q3And forming a bootstrap charging loop in the bootstrap driving circuit.
According to a preferred embodiment, the first driving signal of the driving component passes through a shaping circuit and the main switch tube Q1Is connected to the gate of (1). When the inductor current in the BUCK converter is continuous, the shaping circuit is configured to output the same signal as the first driving signal to the main switch tube Q1A gate electrode of (2). Inductor current interruption in BUCK converter and said main switching tube Q1When the circuit is turned off, the shaping circuit is configured to pull down the main switch tube Q1Gate to source voltage.
According to a preferred embodiment, the shaping circuit comprises at least a first resistor R1A second resistor R2A third resistor R3A third diode D4A first triode Q4And a second triode Q5. The driving component and the second resistor R2Connected, the second resistor R2And the second triode Q5Is connected to the base of (1). The second triode Q5Respectively with the first triode Q4Base and third resistor R3And (4) connecting. The second triode Q5Respectively with the main switching tube Q1And said first resistor R1And (4) connecting. A first triode Q4Collector and emitter of and the main switching tube Q1Are connected in parallel with the source. The first triode Q4And the second triode Q5The PN junction direction of (a) is different.
According to a preferred embodiment, the inductor current is interrupted and the main switching tube Q is switched on and off1When the power is turned off, the first triode Q4The main switch tube Q1The gate to source voltage of (1) is pulled low.
The bootstrap drive circuit of the BUCK converter without the negative current, provided by the invention, has at least the following beneficial technical effects:
as shown in fig. 4 and 5, in the improved bootstrap driving circuit of the conventional synchronous rectification type BUCK converter, a certain leak still exists in the improved bootstrap driving circuit, and when the energy storage inductor L in the BUCK converter operates in the current continuous operation mode, the bootstrap driving circuit provided in the patent can be normally applied. However, when the load is light, the energy storage inductor L in the BUCK converter enters a current interruption mode, and at this time, the output filter capacitor discharges through the energy storage inductor L in the BUCK circuit and the added bootstrap charging loop to generate a large negative inductor current, which causes additional loss. Specifically, as shown in fig. 4 and 5, the switch tube M in fig. 52After conduction, the capacitor C on the output side1Energy storage inductor L and diode D2Resistance R1And a switching tube M2The formed loop is conducted. If the switch tube M2The conducting time is long, and the situation that the BUCK converter is in a current interrupted working mode is considered, at the moment, the situation that no current exists in the loop inevitably occurs, the voltage on the output side is higher than the voltage on the side of the switching tube, so that the capacitor on the output side discharges through the loop, the current reversely flows back, and the situation that the inductive current is negative occurs. If the negative-direction inductive current is too large, a large-current MOS tube needs to be selected for an MOS tube (switching tube) added in the bootstrap startup circuit, so that the cost is increased. The invention passes through the second switch tube Q connected in series3And respectively driving the second switch tube Q by adopting a first driving signal and a second driving signal which are complementary to each other3And a first switching tube Q2So that the second switch tube Q3And a first switching tube Q2Will not be in a conducting state at the same time, or the second switch tube Q3And a first switching tube Q2Meanwhile, the time of the on state is short, so that the output filter capacitor C is enabled to be output2Discharging circuits, i.e. output filter capacitors C as in FIG. 12Energy storage inductor L and second switch tube Q3A first diode D2A first switch tube Q2The formed bootstrap charging loop cannot conductThe conduction or conduction time is short, so that negative inductive current cannot be generated or only small negative inductive current can be generated, the loss is reduced, and the capacity of the MOS tube is reduced, so that the circuit cost is reduced. Furthermore, the main switch tube Q is also driven by the first driving signal1When the inductor current is continuous, the main switch tube Q1And a second switching tube Q3Can be driven by the same driving signal, but when the inductive current is interrupted, the main switch tube Q1Is raised and free resonance occurs, e.g. still with the second switching tube Q3The same driving signal, the main switch tube Q1The voltage of the gate pole to the source pole is a negative value and is easy to exceed the negative limit value of the voltage of the gate pole of the MOS tube, so that the main switch tube Q1The driving signal of the MOS transistor needs to be used after passing through the shaping circuit, so that the negative voltage of a gate pole to a source pole is prevented when the inductive current is interrupted.
Drawings
FIG. 1 is a schematic circuit diagram of a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the PWM shaping circuit of FIG. 1;
FIG. 3 is a conventional diode follow-on BUCK converter;
FIG. 4 is a block diagram of a prior art improved BUCK converter bootstrap drive circuit;
fig. 5 is a schematic circuit diagram of the bootstrap driving circuit module in fig. 4.
List of reference numerals
Q1: main switch tube Q2: first switch tube Q3: second switch tube
Q4: first triode Q5: second triode D1: freewheeling diode
D2: first diode D3: second diode D4: third diode
C1: input filter capacitor C2: output filter capacitor C3: bootstrap capacitor
R1: a first resistor R2: a second resistor R3: third resistance
L: energy storage inductance VCC: auxiliary power supply
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the invention provides a bootstrap driving circuit of BUCK converter without negative current, which at least comprises a first switch tube Q2A second switch tube Q3And driving the first switching tubes Q respectively2A second switch tube Q3Main switch tube Q in BUCK converter1The drive assembly of (1). Preferably, the driving component may be a driving chip, a driving circuit, or the like. First switch tube Q2And a second switch tube Q3Are connected in series with each other. The driving component is configured to drive the main switch tube Q based on a first driving signal1And a second switching tube Q3. The driving component is configured to drive the first switch tube Q based on the second driving signal2. The first driving signal and the second driving signal are complementary to each other to avoid the first switch tube Q2And a second switch tube Q3And is simultaneously turned on. Or reducing the first switching tube Q2And a second switch tube Q3The time of simultaneous conduction.
Preferably, the bootstrap drive circuit of the BUCK converter without negative current comprises at least a first switch tube Q2A first diode D2 and a driving component. Preferably, the driving component may be a driving chip, a driving circuit, or the like. The bootstrap drive circuit is further provided with a first diode D2 and a first switch tube Q2Second switch tube Q connected in series3. The driving component is configured to drive a main switching tube Q of the BUCK converter based on a first driving signal1And a second switching tube Q3. The driving component is configured to drive the first switch tube Q based on the second driving signal2. The amplitudes of the first drive signal and the second drive signal are added to each other to be constant.
Preferably, the bootstrap drive circuit of the BUCK converter without negative current comprises at least a first diode D2 and a first switch tube Q which are connected in series with each other2A second switch tube Q3And drivingAnd (6) assembling. Preferably, the driving component may be a driving chip, a driving circuit, or the like. The driving component is configured to drive a main switching tube Q of the BUCK converter based on a first driving signal1And a second switching tube Q3. The driving component is configured to drive the first switch tube Q based on the second driving signal2. The first drive signal and the second drive signal are complementary to each other.
Through the above setting mode, the beneficial technical effect who reaches is:
as shown in fig. 4 and 5, in the improved bootstrap driving circuit of the conventional synchronous rectification type BUCK converter, a certain leak still exists in the improved bootstrap driving circuit, and when the energy storage inductor L in the BUCK converter operates in the current continuous operation mode, the bootstrap driving circuit provided in the patent can be normally applied. However, when the load is light, the energy storage inductor L in the BUCK converter enters a current interruption mode, and at this time, the output filter capacitor discharges through the energy storage inductor L in the BUCK circuit and the added bootstrap charging loop to generate a large negative inductor current, which causes additional loss. Specifically, as shown in fig. 4 and 5, the switch tube M in fig. 52After conduction, the capacitor C on the output side1Energy storage inductor L and diode D2Resistance R1And a switching tube M2The formed loop is conducted. If the switch tube M2The conducting time is long, and the situation that the BUCK converter is in a current interrupted working mode is considered, at the moment, the situation that no current exists in the loop inevitably occurs, the voltage on the output side is higher than the voltage on the side of the switching tube, so that the capacitor on the output side discharges through the loop, the current reversely flows back, and the situation that the inductive current is negative occurs. If the negative-direction inductive current is too large, a large-current MOS tube needs to be selected for an MOS tube (switching tube) added in the bootstrap startup circuit, so that the cost is increased. The invention passes through the second switch tube Q connected in series3And respectively driving the second switch tube Q by adopting a first driving signal and a second driving signal which are complementary to each other3And a first switching tube Q2So that the second switch tube Q3And a first switching tube Q2Will not be in a conducting state at the same time, or the second switch tube Q3And a first switching tube Q2Meanwhile, the time of the on state is short, so that the output filter capacitor C is enabled to be output2Discharging circuits, i.e. output filter capacitors C as in FIG. 12Energy storage inductor L and second switch tube Q3A first diode D2A first switch tube Q2The formed bootstrap charging loop cannot be conducted or is short in conducting time, so that negative inductive current cannot be generated or only small negative inductive current can be generated, loss is reduced, and the capacity of an MOS (metal oxide semiconductor) tube is reduced, so that the circuit cost is reduced.
Preferably, the bootstrap drive circuit of the BUCK converter without negative current comprises at least a first diode D2 and a first switch tube Q which are connected in series with each other2A second switch tube Q3And a drive assembly. Preferably, the driving component may be a driving chip, a driving circuit, or the like. The driving component is configured to drive a main switching tube Q of the BUCK converter based on a first driving signal1And a second switching tube Q3. The driving component is configured to drive the first switch tube Q based on the second driving signal2. The first drive signal and the second drive signal are complementary to each other. The first drive signal passes through the shaping circuit and the main switch tube Q1And (4) connecting. By the arrangement, the second switch tube Q is connected in series3And respectively driving the second switch tube Q by adopting a first driving signal and a second driving signal which are complementary to each other3And a first switching tube Q2So that the second switch tube Q3And a first switching tube Q2Will not be in a conducting state at the same time, or the second switch tube Q3And a first switching tube Q2Meanwhile, the time of the on state is short, so that the output filter capacitor C is enabled to be output2Discharging circuits, i.e. output filter capacitors C as in FIG. 12Energy storage inductor L and second switch tube Q3A first diode D2A first switch tube Q2The formed bootstrap charging loop cannot be conducted or is short in conducting time, so that negative inductive current cannot be generated or only small negative inductive current can be generated, loss is reduced, and the capacity of an MOS (metal oxide semiconductor) tube is reduced, so that the circuit cost is reduced. But since the first driving signal also drives the main switch tube Q1When is coming into contact withWhen the inductive current is continuous, the main switch tube Q1And a second switching tube Q3Can be driven by the same driving signal, but when the inductive current is interrupted, the main switch tube Q1Is raised and free resonance occurs, e.g. still with the second switching tube Q3The same driving signal, the main switch tube Q1The voltage of the gate pole to the source pole is a negative value and is easy to exceed the negative limit value of the voltage of the gate pole of the MOS tube, so that the main switch tube Q1The driving signal of the MOS transistor needs to be used after passing through the shaping circuit, so that the negative voltage of a gate pole to a source pole is prevented when the inductive current is interrupted.
According to a preferred embodiment, the second switching tube Q3Drain of the BUCK converter and a main switching tube Q of the BUCK converter1Is connected to the source of (a). First switch tube Q2Is grounded.
According to a preferred embodiment, the BUCK converter comprises at least a freewheeling diode D1Energy storage inductor L and output filter capacitor C2. Freewheeling diode D1Are connected in parallel with the bootstrap charging branch of the bootstrap driving circuit. The bootstrap charging branch circuit is composed of at least a first diode D2 and a first switch tube Q2And a second switching tube Q3And (4) forming.
According to a preferred embodiment, the bootstrap driving circuit further comprises a bootstrap capacitor C3Auxiliary power supply VCCAnd a second diode D3. Bootstrap capacitor C3Auxiliary power supply VCCA second diode D3A first diode D2, a first switch tube Q2And a second switching tube Q3And a bootstrap charging loop in the bootstrap driving circuit is formed.
Preferably, the first driving signal of the driving component passes through the shaping circuit and the main switch tube Q1Is connected to the gate of (1). When the inductor current in the BUCK converter is continuous, the shaping circuit is configured to output the same signal as the first driving signal to the main switch tube Q1A gate electrode of (2). Inductor current interruption and main switch tube Q in BUCK converter1When the circuit is turned off, the shaping circuit is configured to pull down the main switch tube Q1Gate to source voltage. Preferably, the shaping circuit may be as shown in the figure1, shown in the figure.
Preferably, as shown in fig. 2, the shaping circuit comprises at least a first resistor R1A second resistor R2A third resistor R3A third diode D4A first triode Q4And a second triode Q5. Drive component and second resistor R2Connected by a second resistor R2And a second triode Q5Is connected to the base of (1). Second triode Q5Respectively with the first triode Q4Base and third resistor R3And (4) connecting. Second triode Q5Respectively with the main switching tube Q1Gate and first resistor R1And (4) connecting. A first triode Q4Collector and emitter of and main switching tube Q1Are connected in parallel with the source. A first triode Q4And a second triode Q5The PN junction direction of (a) is different. Preferably, as shown in FIG. 2, the first resistor R1Phase main switch tube Q1And the other end of the first diode D and a third diode D4And (4) connecting. Third diode D4Cathode of and the second switch tube Q3And (4) connecting.
According to a preferred embodiment, the inductor current is interrupted and the main switching tube Q1When turned off, the first triode Q4A main switch tube Q1The gate to source voltage of (1) is pulled low.
The present specification encompasses multiple inventive concepts and the applicant reserves the right to submit divisional applications according to each inventive concept. The present description contains several inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", each indicating that the respective paragraph discloses a separate concept, the applicant reserves the right to submit divisional applications according to each inventive concept.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.
Claims (10)
1. A bootstrap drive circuit of BUCK converter without negative current is characterized by at least comprising a first switch tube (Q)2) A second switch tube (Q)3) And driving the first switching tubes (Q) respectively2) A second switch tube (Q)3) Main switch tube (Q) in BUCK converter1) The drive assembly of (1), wherein,
the first switch tube (Q)2) And the second switching tube (Q)3) Are connected in series with each other and the drive assembly is configured to drive the main switching tube (Q) based on a first drive signal1) And a second switching tube (Q)3) And drives the first switching tube (Q) based on a second drive signal2) Wherein, in the step (A),
the first and second drive signals are complementary to each other to avoid the first switch tube (Q)2) And the second switching tube (Q)3) Simultaneously turning on or off the first switching tube (Q)2) And the second switching tube (Q)3) The time of simultaneous conduction.
2. A bootstrap drive circuit of BUCK converter without negative current comprises at least a first switch tube (Q)2) A first diode (D2) and a drive element, characterized in that,
the bootstrap drive circuit is further provided with a first diode (D2) and a first switch tube (Q)2) Second switch tube (Q) connected in series3) Wherein, in the step (A),
the drive component is configured to drive a main switching tube (Q) of the BUCK converter based on a first drive signal1) And a second switching tube (Q)3) And drives the first switching tube (Q) based on a second drive signal2) Wherein, in the step (A),
the amplitudes of the first drive signal and the second drive signal are added to each other to be a constant value.
3. AThe bootstrap drive circuit of the BUCK converter without negative current is characterized by at least comprising a first diode (D2) and a first switching tube (Q) which are connected in series with each other2) A second switch tube (Q)3) And a drive assembly, wherein,
the drive component is configured to drive a main switching tube (Q) of the BUCK converter based on a first drive signal1) And a second switching tube (Q)3) And drives the first switching tube (Q) based on a second drive signal2) Wherein, in the step (A),
the first drive signal and the second drive signal are complementary to each other.
4. The bootstrap drive circuit of the BUCK converter without negative current is characterized by at least comprising a first diode (D2) and a first switching tube (Q) which are connected in series with each other2) A second switch tube (Q)3) And a drive assembly, wherein,
the drive component is configured to drive a main switching tube (Q) of the BUCK converter based on a first drive signal1) And a second switching tube (Q)3) And drives the first switching tube (Q) based on a second drive signal2) Wherein, in the step (A),
the first and second drive signals are complementary to each other and the first drive signal is passed through a shaping circuit and the main switching tube (Q)1) And (4) connecting.
5. BUCK converter bootstrap drive circuit as in any of the claims 1 to 4, characterized by the fact that said second switching tube (Q)3) And a main switching tube (Q) of the BUCK converter1) The first switching tube (Q)2) Is grounded.
6. BUCK converter bootstrap drive circuit as claimed in claim 5, characterized in that the BUCK converter comprises at least a freewheeling diode (D)1) An energy storage inductor (L) and an output filter capacitor (C)2) Wherein, in the step (A),
the freewheeling diode (D)1) And the bootstrap drive circuitThe bootstrap-charging branches of the circuit are connected in parallel, wherein,
the bootstrap charging branch is at least composed of the first diode (D2), the first switch tube (Q)2) And a second switching tube (Q)3) And (4) forming.
7. The BUCK converter bootstrap driver circuit as recited in claim 6, wherein said bootstrap driver circuit further comprises a bootstrap capacitor (C)3) Auxiliary power supply (V)CC) And a second diode (D)3) Wherein, in the step (A),
the bootstrap capacitor (C)3) Auxiliary power supply (V)CC) A second diode (D)3) A first diode (D2), a first switch tube (Q)2) And a second switching tube (Q)3) And forming a bootstrap charging loop in the bootstrap driving circuit.
8. BUCK converter bootstrap drive circuit as claimed in claim 7, characterized in that the first drive signal of said drive component is passed through a shaping circuit with said main switching tube (Q)1) The gate connection of (a), wherein,
the shaping circuit is configured to output the same signal as the first driving signal to the main switching tube (Q) when the inductor current in the BUCK converter is continuous1) A gate electrode of (a);
inductor current in BUCK converter is interrupted and the main switching tube (Q)1) When turned off, the shaping circuit is configured to pull down the main switching tube (Q)1) Gate to source voltage.
9. BUCK converter bootstrap drive circuit as claimed in claim 8, characterized in that said shaping circuit comprises at least a first resistor (R)1) A second resistor (R)2) A third resistor (R)3) A third diode (D)4) A first triode (Q)4) And a second triode (Q)5) Wherein, in the step (A),
the drive component and the second resistor (R)2) Connected, the second resistor (R)2) And the second triode (Q)5) Is connected to the base electrode of the semiconductor device, wherein,
the second triode (Q)5) Respectively with the first triode (Q)4) Base and third resistor (R)3) Connected, the second triode (Q)5) Respectively with said main switching tube (Q)1) And said first resistance (R)1) The connection is carried out, wherein,
a first triode (Q)4) Collector and emitter of (a) and said main switching tube (Q)1) Is connected in parallel with the source, and the first triode (Q)4) And the second triode (Q)5) The PN junction direction of (a) is different.
10. BUCK converter bootstrap drive circuit as claimed in claim 9, characterized in that the inductor current is interrupted and the main switching tube (Q) is open1) When turned off, the first triode (Q)4) The main switch tube (Q)1) The gate to source voltage of (1) is pulled low.
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| CN202011011764.2A CN112187045B (en) | 2020-09-23 | 2020-09-23 | Boock converter bootstrap drive circuit without negative current |
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| CN112187045B CN112187045B (en) | 2021-08-24 |
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| CN113346720A (en) * | 2021-06-21 | 2021-09-03 | 东莞市凌风科技有限公司 | High-frequency driving amplifier, high-frequency power conversion circuit and radio frequency cosmetic instrument |
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