CN216356476U - Drive control circuit for switching tube of BUCK circuit - Google Patents
Drive control circuit for switching tube of BUCK circuit Download PDFInfo
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- CN216356476U CN216356476U CN202122852450.1U CN202122852450U CN216356476U CN 216356476 U CN216356476 U CN 216356476U CN 202122852450 U CN202122852450 U CN 202122852450U CN 216356476 U CN216356476 U CN 216356476U
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Abstract
The utility model discloses a drive control circuit of a switching tube of a BUCK circuit, which relates to the technical field of drive control of the switching tube and comprises a resistor R3, a resistor R4, a resistor R5, a resistor R16, a resistor R18, a resistor R19, a capacitor C2, a capacitor C3, a capacitor C13, a capacitor C19, a capacitor C22, a chip U1, a chip U3, a voltage VCC1 end and a voltage VCC2 end. Sampling the output voltage, comparing the sampled output voltage with a set voltage value required to be output, and generating a pulse with a certain duty ratio to control the on-off of a switching tube so as to stabilize the output voltage to the required voltage value; a logic driving control circuit of the circuit switching tube adopts an SG3525 chip, and the generated driving signal realizes the electrical isolation of the signal and a main circuit through a TLP557 driving chip and is used as the driving signal of the switching tube; the optocoupler TLP557 isolation drive is adopted, and the optocoupler drive can be utilized to realize the electrical isolation of the main circuit and the control circuit, so that the potential safety hazard caused by the introduction of the high voltage of the main circuit into the control circuit is prevented, and the electromagnetic interference of the main circuit to the control circuit is reduced as much as possible.
Description
Technical Field
The utility model relates to the technical field of drive control circuits, in particular to a drive control circuit of a switching tube of a BUCK circuit.
Background
The wireless power transmission technology carries out power transmission in a non-contact mode, and has the advantages of flexibility, safety, convenience and the like because no electric direct connection exists physically.
In some rotating application occasions, electric energy transmission is mostly realized through a contact type conductive slip ring, and the defects of large mechanical abrasion, short service life, sparking and the like generally exist in the method for transmitting electric energy.
The Buck circuit is a Buck chopper circuit, is one of basic DC-DC circuits, is used for the step-down conversion from direct current to direct current, and with the continuous development of society, the living standard is also improving constantly, and electrical equipment is increasing day by day, and what many electrical equipment internal power supply converting circuits adopted is the Buck circuit, and its range of application is very extensive.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a drive control circuit of a switching tube of a BUCK circuit aiming at the defects of the background art, which generates a pulse with a certain duty ratio to control the on and off of the switching tube by sampling the output voltage and comparing the output voltage with the set voltage value required to be output, so that the output voltage is stabilized to the required voltage value; the logic driving control circuit of the circuit switching tube adopts an SG3525 chip, and the generated driving signal realizes the electrical isolation of the signal and the main circuit through a TLP557 driving chip and is used as the driving signal of the switching tube.
The utility model adopts the following technical scheme for solving the technical problems:
a drive control circuit of a switching tube of a BUCK circuit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R16, a resistor R18, a resistor R19, a capacitor C2, a capacitor C3, a capacitor C13, a capacitor C19, a capacitor C22, a chip U1, a chip U3, a voltage VCC1 end and a voltage VCC2 end,
the voltage VCC1 end is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the pins 11 and 11 of the chip U3 respectively
the pin 15 of the chip U3 is respectively connected with the other end of the resistor R5 and one end of the resistor R3, and the other end of the resistor R3 is connected with the pin 2 of the chip U1;
a pin 16 of a chip U3 is connected with one end of a capacitor C2 and one end of a resistor R16 respectively, the other end of the capacitor C2 is grounded, the other end of the resistor R16 is connected with one end of a resistor R19, one end of a capacitor C13, one end of a capacitor C22 and a pin 13 of the chip U3 respectively and grounded, the other end of a resistor R19 is connected with a pin 6 of the chip U3, the other end of the capacitor C13 is connected with a pin 9 of the chip U3, the other end of a capacitor C22 is connected with a pin 5 of the chip U3 and one end of a resistor R18 respectively, and the other end of the resistor R18 is connected with a pin 7 of the chip U3;
a pin 8 of the chip U1 is respectively connected with one end of a resistor R4 and a voltage VCC2 end;
As a further preferable scheme of the drive control circuit of the switching tube of the BUCK circuit, the model of the chip U3 is SG 3525.
As a further preferable aspect of the BUCK circuit switching tube driving control circuit of the present invention, the chip model number of the chip U1 is TLP 557.
Compared with the prior art, the utility model adopting the technical scheme has the following technical effects:
1. the utility model relates to a drive control circuit of a switching tube of a BUCK circuit, which generates a pulse with a certain duty ratio to control the on-off of the switching tube by sampling an output voltage and comparing the sampled output voltage with a set voltage value required to be output so as to stabilize the output voltage to the required voltage value; a logic driving control circuit of the circuit switching tube adopts an SG3525 chip, and the generated driving signal realizes the electrical isolation of the signal and a main circuit through a TLP557 driving chip and is used as the driving signal of the switching tube;
2. the circuit of the utility model adopts the optocoupler TLP557 isolation drive, and the optocoupler drive can realize the electrical isolation of the main circuit and the control circuit, thereby preventing the potential safety hazard caused by the introduction of the high voltage of the main circuit into the control circuit and reducing the electromagnetic interference of the main circuit to the control circuit as much as possible.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a circuit diagram of a drive control circuit of a switching tube of a BUCK circuit.
Detailed Description
The technical scheme of the utility model is further explained in detail by combining the attached drawings:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A drive control circuit of a switching tube of a BUCK circuit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R16, a resistor R18, a resistor R19, a capacitor C2, a capacitor C3, a capacitor C13, a capacitor C19, a capacitor C22, a chip U1, a chip U3, a voltage VCC1 end and a voltage VCC2 end,
the voltage VCC1 end is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the pins 11 and 11 of the chip U3 respectively
the pin 15 of the chip U3 is respectively connected with the other end of the resistor R5 and one end of the resistor R3, and the other end of the resistor R3 is connected with the pin 2 of the chip U1;
a pin 16 of a chip U3 is connected with one end of a capacitor C2 and one end of a resistor R16 respectively, the other end of the capacitor C2 is grounded, the other end of the resistor R16 is connected with one end of a resistor R19, one end of a capacitor C13, one end of a capacitor C22 and a pin 13 of the chip U3 respectively and grounded, the other end of a resistor R19 is connected with a pin 6 of the chip U3, the other end of the capacitor C13 is connected with a pin 9 of the chip U3, the other end of a capacitor C22 is connected with a pin 5 of the chip U3 and one end of a resistor R18 respectively, and the other end of the resistor R18 is connected with a pin 7 of the chip U3;
a pin 8 of the chip U1 is respectively connected with one end of a resistor R4 and a voltage VCC2 end;
a pin 6 of the chip U1 is respectively connected with the other end of the resistor R4 and the pulse end;
the model of the chip U3 is SG 3525.
The chip model of the chip U1 is TLP 557.
According to the utility model, the output voltage is sampled and compared with the set voltage value required to be output, and the pulse with a certain duty ratio is generated to control the on-off of the switching tube, so that the output voltage is stabilized to the required voltage value; a logic driving control circuit of the circuit switching tube adopts an SG3525 chip, and the generated driving signal realizes the electrical isolation of the signal and a main circuit through a TLP557 driving chip and is used as the driving signal of the switching tube;
the circuit of the utility model adopts the optocoupler TLP557 isolation drive, and the optocoupler drive can realize the electrical isolation of the main circuit and the control circuit, thereby preventing the potential safety hazard caused by the introduction of the high voltage of the main circuit into the control circuit and reducing the electromagnetic interference of the main circuit to the control circuit as much as possible.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. The utility model provides a BUCK circuit switch tube drive control circuit which characterized in that: comprises a resistor R3, a resistor R4, a resistor R5, a resistor R16, a resistor R18, a resistor R19, a capacitor C2, a capacitor C3, a capacitor C13, a capacitor C19, a capacitor C22, a chip U1, a chip U3, a voltage VCC1 terminal, a voltage VCC2 terminal,
the voltage VCC1 end is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the pins 11 and 11 of the chip U3 respectively
Pin 14 of chip U3 and ground;
pin 8 of the chip U3 is connected with one end of the capacitor C19, and pin 10 of the chip U3 is respectively connected with the other end of the capacitor C19 and grounded;
pin 13 of the chip U3 is connected with one end of the resistor R5 and pin 3 of the chip U1 respectively;
the pin 15 of the chip U3 is respectively connected with the other end of the resistor R5 and one end of the resistor R3, and the other end of the resistor R3 is connected with the pin 2 of the chip U1;
a pin 16 of a chip U3 is connected with one end of a capacitor C2 and one end of a resistor R16 respectively, the other end of the capacitor C2 is grounded, the other end of the resistor R16 is connected with one end of a resistor R19, one end of a capacitor C13, one end of a capacitor C22 and a pin 13 of the chip U3 respectively and grounded, the other end of a resistor R19 is connected with a pin 6 of the chip U3, the other end of the capacitor C13 is connected with a pin 9 of the chip U3, the other end of a capacitor C22 is connected with a pin 5 of the chip U3 and one end of a resistor R18 respectively, and the other end of the resistor R18 is connected with a pin 7 of the chip U3;
a pin 8 of the chip U1 is respectively connected with one end of a resistor R4 and a voltage VCC2 end;
pin 6 of chip U1 is connected to the other end of resistor R4.
2. The drive control circuit of the switching tube of the BUCK circuit according to claim 1, characterized in that: the model of the chip U3 is SG 3525.
3. The drive control circuit of the switching tube of the BUCK circuit according to claim 1, characterized in that: the chip model of the chip U1 is TLP 557.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122852450.1U CN216356476U (en) | 2021-11-21 | 2021-11-21 | Drive control circuit for switching tube of BUCK circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122852450.1U CN216356476U (en) | 2021-11-21 | 2021-11-21 | Drive control circuit for switching tube of BUCK circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216356476U true CN216356476U (en) | 2022-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122852450.1U Active CN216356476U (en) | 2021-11-21 | 2021-11-21 | Drive control circuit for switching tube of BUCK circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216356476U (en) |
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2021
- 2021-11-21 CN CN202122852450.1U patent/CN216356476U/en active Active
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