CN217656609U - Bootstrap driving circuit based on voltage comparator - Google Patents
Bootstrap driving circuit based on voltage comparator Download PDFInfo
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- CN217656609U CN217656609U CN202220561058.3U CN202220561058U CN217656609U CN 217656609 U CN217656609 U CN 217656609U CN 202220561058 U CN202220561058 U CN 202220561058U CN 217656609 U CN217656609 U CN 217656609U
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Abstract
The utility model relates to a bootstrap drive circuit based on voltage comparator comprises level conversion circuit, bootstrap circuit, voltage comparator U1, reference circuit, clamp protection circuit and output totem circuit, and reference circuit, clamp protection circuit are voltage comparator U1's attached circuit. The voltage comparator U1, the transistor Q2 and fewer accessory elements (diodes, triodes and resistors) are used for forming the bootstrap drive circuit to replace an application-specific integrated circuit, the circuit parameter adjustment is flexible, for example, the working voltage and the driving current of the circuit can be adjusted by replacing transistors with different withstand voltages and different currents, and the cost is reduced by using a circuit built by discrete elements.
Description
Technical Field
The utility model discloses can be applied to motor drive and switching power supply technical field, concretely relates to bootstrap drive circuit based on voltage comparator.
Background
In an electronic circuit, the field of motor driving and switching power supplies is related, and the topology structure of the electronic circuit is mostly composed of half-bridge inverter circuits with different numbers, and one half bridge is generally composed of two power units (one power unit may be one power device, or a plurality of power devices are connected in parallel), that is: an upper bridge and a lower bridge. For example, in a motor driving application, the power units of the upper bridge and the lower bridge need complementary PWM signals to drive, and when the lower bridge is turned off, the ground of the upper bridge and the ground of the driving signal are no longer the same reference ground, i.e. floating ground. Therefore, the driving circuit of the power unit has the most important purpose of requiring the upper bridge to have floating ground driving besides having the power amplification function, and the driving circuit is basically completed by using a dedicated bootstrap driving IC in most current applications, and the disadvantages are that: high cost and low drive current.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above problem, this application provides a bootstrap drive circuit based on voltage comparator, and the circuit is simple, with low costs, and exports for totem's structure, and drive current can select output transistor according to different applications, and is more nimble.
In order to achieve the above object, the utility model provides a following technical scheme: a bootstrap drive circuit based on a voltage comparator is composed of a level conversion circuit, a bootstrap circuit, a voltage comparator U1, a reference circuit, a clamping protection circuit and an output totem circuit, wherein the level conversion circuit is composed of a resistor R5, a resistor R1 and a transistor Q2, one end of the resistor R5 is connected with an input end, the other end of the resistor R5 is connected with a grid electrode of the transistor Q2, a source electrode of the transistor Q2 is grounded, a drain electrode of the transistor Q2 is connected with one end of the resistor R1, and the other end of the resistor R1 is connected with an HVCC; the reference circuit is formed by connecting a resistor R4 and a resistor R6 in series to form a voltage divider, and the output end of the voltage divider is connected to the input positive of a voltage comparator U1; the clamping protection circuit consists of a diode D2 and a resistor R2, wherein the anode of the diode D2 is connected with HGND, the cathode of the diode D2 is connected with the input negative pole of a voltage comparator U1, one end of the resistor R2 is connected with the drain electrode of a transistor Q2, and the other end of the resistor R2 is used as the input of the voltage comparator U1 through the cathode of the diode D2; the output totem circuit is composed of a resistor R3, a triode Q1 and a triode Q3, one end of the resistor R3 is connected with the output of a voltage comparator U1, the other end of the resistor R3 is connected with the base electrodes of the triode Q1 and the triode Q3, the collector electrode of the triode Q1 is connected with HVCC, the collector electrode of the triode Q3 is connected with HGND, and the emitter electrodes of the triode Q1 and the triode Q3 are connected with each other to serve as the output.
Further: the reference circuit and the clamping protection circuit are auxiliary circuits of the voltage comparator U1.
And further: and the signal of the input signal end is sent out by the MCU.
Further: and a system power supply of the bootstrap drive circuit is VCC.
Compared with the prior art, the beneficial effects of the utility model reside in that:
a bootstrap drive circuit based on a voltage comparator is composed of a level conversion circuit, a bootstrap circuit, a voltage comparator U1, a reference circuit, a clamping protection circuit and an output totem circuit. The voltage comparator U1, the transistor Q2 and fewer accessory elements (diodes, triodes and resistors) are used for forming the bootstrap drive circuit to replace an application-specific integrated circuit, the circuit parameter adjustment is flexible, for example, the working voltage and the driving current of the circuit can be adjusted by replacing transistors with different withstand voltages and different currents, and the cost is reduced by using a circuit built by discrete elements.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required to be used in the description of the embodiment will be briefly introduced below, it is obvious that the drawings in the following description are only for more clearly illustrating the embodiment of the present invention or the technical solution in the prior art, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is an overall circuit diagram of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described with reference to the following specific embodiments, which are provided by way of illustration only and not by way of limitation.
The bootstrap driving circuit based on the voltage comparator as shown in fig. 1 is composed of a level conversion circuit, a bootstrap circuit, a voltage comparator U1, a reference circuit, a clamp protection circuit and an output totem circuit, wherein the reference circuit and the clamp protection circuit are auxiliary circuits of the voltage comparator U1, the level conversion circuit is composed of a resistor R5, a resistor R1 and a transistor Q2, one end of the resistor R5 is connected with an input signal end, the other end is connected with a gate of the transistor Q2, a source electrode of the transistor Q2 is grounded, a drain electrode of the transistor Q2 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to an HVCC; the reference circuit is composed of a resistor R4 and a resistor R6 which are connected in series to form a voltage divider, and the output end of the voltage divider is connected to the 'input positive' of the voltage comparator U1; the clamping protection circuit consists of a diode D2 and a resistor R2, wherein the anode of the diode D2 is connected with HGND, the cathode of the diode D2 is connected with the input negative pole of a voltage comparator U1, one end of the resistor R2 is connected with the drain electrode of a transistor Q2, and the other end of the resistor R2 is used as the input of the voltage comparator U1 through the cathode of the diode D2; the output totem circuit is composed of a resistor R3, a triode Q1 and a triode Q3, one end of the resistor R3 is connected with the output of a voltage comparator U1, the other end of the resistor R3 is connected with the base electrodes of the triode Q1 and the triode Q3, the collector electrode of the triode Q1 is connected with HVCC, the collector electrode of the triode Q3 is connected with HGND, and the emitter electrodes of the triode Q1 and the triode Q3 are connected with each other to serve as the output.
VCC is the system power supply, input signal generally is sent by MCU, MCU sends complementary PWM signal about the system application, lower bridge signal passes through drive circuit drive lower power unit, when lower power unit is down, HGND passes through lower bridge power pipe and links to each other with GND, VCC electric current charges to electric capacity C2 through diode D1, lower power unit switches on after a period of time and accomplishes, electric capacity C2 charges simultaneously, the electric potential rise of HGND after the lower bridge is closed, the upper bridge is opened.
Specific working process
When the MCU sends out that the PWM is high level, the PWM is applied to the grid electrode of the transistor Q2 through the resistor R5, so that the transistor Q2 is conducted, the potential of the drain electrode of the transistor Q2 is changed from high to low, the signal is input to the 'input negative' of the voltage comparator U1 through the resistor R2, at the moment, the 'input negative' voltage of the voltage comparator U1 is larger than the 'input positive', the voltage comparator U1 outputs high level, therefore, the base electrode of the triode Q1 becomes high level, and the conduction output of the triode Q1 becomes high level. When the PWM signal is at low level, the transistor Q2 is turned off, the drain potential of the transistor Q2 changes from low to high, at this time, the "input negative" of the voltage comparator U1 changes to low level, and since the "input negative" voltage of the voltage comparator U1 is smaller than the "input positive" voltage, the voltage comparator U1 outputs low level, the base of the transistor Q1 changes to low level, and the whole bootstrap driving process is completed. Diode D1 acts as an input negative clamp to protect voltage comparator U1 from damage due to "input negative" voltage going out of range.
The utility model discloses a key point and guard point
The bootstrap drive circuit is composed of the voltage comparator U1, the transistor Q2, the diode, the triode and the resistor to replace an application-specific integrated circuit, the circuit parameter adjustment is flexible, for example, the working voltage and the driving current of the circuit can be adjusted by replacing transistors with different withstand voltages and different currents, and the cost is reduced by using a circuit built by discrete components.
The circuit can also be used for a half-bridge driving circuit, and has the advantages of simple circuit, low cost and flexible application.
The present invention is not described in detail in the prior art.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the present invention to the embodiment described in the specification and drawings. Therefore, all equivalent changes or modifications made according to the structure, characteristics and principles described in the claims of the present invention should be included in the claims of the present invention.
Claims (4)
1. A bootstrap drive circuit based on voltage comparator characterized in that: the level conversion circuit is composed of a resistor R5, a resistor R1 and a transistor Q2, one end of the resistor R5 is connected with an input signal end, the other end of the resistor R5 is connected with a grid electrode of the transistor Q2, a source electrode of the transistor Q2 is grounded, a drain electrode of the transistor Q2 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the HVCC; the reference circuit is formed by connecting a resistor R4 and a resistor R6 in series to form a voltage divider, and the output end of the voltage divider is connected to the input positive of a voltage comparator U1; the clamping protection circuit consists of a diode D2 and a resistor R2, wherein the anode of the diode D2 is connected with HGND, the cathode of the diode D2 is connected with the input negative pole of a voltage comparator U1, one end of the resistor R2 is connected with the drain electrode of a transistor Q2, and the other end of the resistor R2 is used as the input of the voltage comparator U1 through the cathode of the diode D2; the output totem circuit is composed of a resistor R3, a triode Q1 and a triode Q3, one end of the resistor R3 is connected with the output of a voltage comparator U1, the other end of the resistor R3 is connected with the base electrodes of the triode Q1 and the triode Q3, the collector electrode of the triode Q1 is connected with HVCC, the collector electrode of the triode Q3 is connected with HGND, and the emitter electrodes of the triode Q1 and the triode Q3 are mutually connected as output.
2. The voltage comparator based bootstrap driver circuit of claim 1, characterized in that: the reference circuit and the clamping protection circuit are auxiliary circuits of the voltage comparator U1.
3. The voltage comparator based bootstrap driver circuit as claimed in claim 1, wherein: and the signal of the input signal end is sent out by the MCU.
4. The voltage comparator based bootstrap driver circuit as claimed in claim 1, wherein: and a system power supply of the bootstrap driving circuit is VCC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220561058.3U CN217656609U (en) | 2022-03-15 | 2022-03-15 | Bootstrap driving circuit based on voltage comparator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220561058.3U CN217656609U (en) | 2022-03-15 | 2022-03-15 | Bootstrap driving circuit based on voltage comparator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217656609U true CN217656609U (en) | 2022-10-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220561058.3U Active CN217656609U (en) | 2022-03-15 | 2022-03-15 | Bootstrap driving circuit based on voltage comparator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217656609U (en) |
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2022
- 2022-03-15 CN CN202220561058.3U patent/CN217656609U/en active Active
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