CN210724551U - Switching power supply driving circuit - Google Patents
Switching power supply driving circuit Download PDFInfo
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- CN210724551U CN210724551U CN201921403035.4U CN201921403035U CN210724551U CN 210724551 U CN210724551 U CN 210724551U CN 201921403035 U CN201921403035 U CN 201921403035U CN 210724551 U CN210724551 U CN 210724551U
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- power supply
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Abstract
The utility model discloses a switching power supply drive circuit, including resistance R1, triode Q1, diode D1, transformer T1 and MOS pipe Q4, resistance R1 power VCC and resistance R2 respectively, the resistance R2 other end is the connecting resistance R1 other end and triode Q1 collecting electrode respectively, triode Q2 base and resistance R5 are connected respectively to triode Q1 base, diode D3 is connected to triode Q2 collecting electrode anodal and ground connection, triode Q1 projecting pole is connected respectively to triode Q2 projecting pole, diode D3 negative pole, diode D1 negative pole and resistance R6. The utility model discloses switching power supply drive circuit changes MOS pipe Q4's drive circuit on original basis, lets MOS pipe Q4 drive simpler, removes a set of secondary coil and other components and parts, only adds a small amount of devices and just can reach same effect, has reduced the volume of circuit, the cost is reduced.
Description
Technical Field
The utility model relates to a drive circuit specifically is a switching power supply drive circuit.
Background
FIG. 1 shows a prior art switching power supply driving circuit, when the PWM signal is high, the gate voltage of Q4 is high, the Q4 transistor is turned on, and the base voltage of Q1 is high, Q1 is turned on, and the current direction is VCC-R10// R1-Q1 to the transformer T1A-PIN2 to T1A-PIN 1-Q4-GND. According to the principle of the same name terminal, a PIN2 PIN of T1A is high, a PIN5 PIN of T1C and a PIN3 PIN of T1B are high, and HRB and LRB are high and drive MOSFETs at the same time. When the PWM is at a low voltage, Q2 is conducted, a PIN T1A PIN1 is directly connected and clamped at VCC, and in addition, the voltage T1B PIN3 is negative, Q3 is conducted, and the voltage of HRB is discharged. The voltage of T1C PIN5 is negative, Q31 is conducted, and HRB voltage is discharged.
The prior art has the defects that two groups of secondary coils and two MOSFET tubes are needed, so that the size of the circuit is increased, and the manufacturing cost is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a switching power supply drive circuit to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a switching power supply driving circuit comprises a resistor R1, a triode Q1, a diode D1, a transformer T1 and a MOS tube Q4, wherein the resistor R1 is respectively connected with a power supply VCC and a resistor R2, the other end of the resistor R2 is respectively connected with the other end of a resistor R1 and the collector of a triode Q1, the base of a triode Q1 is respectively connected with the base of a triode Q2 and a resistor R5, the collector of the triode Q2 is connected with the anode of a diode D3 and grounded, the emitter of a triode Q2 is respectively connected with the emitter of a triode Q1, the cathode of a diode D3, the cathode of a diode D1 and a resistor R6, the other end of the resistor R6 is respectively connected with the anode of a diode D1, the resistor R3, the resistor R7 and the G pole of the MOS tube Q7, the S pole of the MOS tube Q7 is grounded, the D pole of the MOS tube Q7 is respectively connected with the anode of a diode D7 and the cathode of a primary coil T7 and the other end of a secondary coil T7 and a secondary coil T7 of the other end of the resistor T7 are respectively connected with the diode, the cathode of the diode D2 is respectively connected with the resistor R10, the emitter of the triode Q3, the resistor R4 and the resistor RS, the other end of the resistor RS is connected with the other end of the resistor R4, the collector of the triode Q3 is respectively connected with the anode of the diode D4 and the other end of the primary side coil T1A of the transformer T1, and the cathode of the diode D4 is respectively connected with the other end of the resistor R9, the other end of the resistor R10 and the base of the triode Q3.
As a further aspect of the present invention: the other end of the resistor R5 is a PWM signal input end.
As a further aspect of the present invention: the triode Q3 is a PNP triode.
As a further aspect of the present invention: the triode Q1 and the triode Q2 are NPN triodes.
As a further aspect of the present invention: the power VCC is a DC power supply.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses switching power supply drive circuit changes MOS pipe Q4's drive circuit on original basis, lets MOS pipe Q4 drive simpler, removes a set of secondary coil and other components and parts, only adds a small amount of devices and just can reach same effect, has reduced the volume of circuit, the cost is reduced.
Drawings
Fig. 1 is a circuit diagram of a prior art circuit.
Fig. 2 is a circuit diagram of the circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 2, a switching power supply driving circuit includes a resistor R, a triode Q, a diode D, a transformer T, and a MOS transistor Q, wherein the resistor R respectively supplies a power VCC and a resistor R, the other end of the resistor R is respectively connected to the other end of the resistor R and a collector of a triode Q, the base of the triode Q is respectively connected to the base of the triode Q and the resistor R, the collector of the triode Q is connected to the anode of the diode D and grounded, the emitter of the triode Q is respectively connected to the emitter of the triode Q, the cathode of the diode D, and the resistor R, the other end of the resistor R is respectively connected to the anode of the diode D, the cathode of the diode R, and the G-pole of the MOS transistor Q, the S-pole of the MOS transistor Q is grounded, the D-pole of the MOS transistor Q is respectively connected to the anode of the diode D and the primary, one end of a secondary side coil T1B of the transformer T1 is connected with the anodes of the resistor R9 and the diode D2 respectively, the cathode of the diode D2 is connected with the emitter of the resistor R10, the emitter of the triode Q3, the resistor R4 and the resistor RS respectively, the other end of the resistor RS is connected with the other end of the resistor R4, the collector of the triode Q3 is connected with the anode of the diode D4 and the other end of a primary side coil T1A of the transformer T1 respectively, the cathode of the diode D4 is connected with the other end of the resistor R9, the other end of the resistor R10 and the base of the triode Q3 respectively.
When the voltage at the input terminal of the PWM signal is positive, the transistor Q1 is turned on, and the loop one: VCC-R1// R2-Q1-R5-R3-LRA-GND, LRA is high potential, connects the gate of MOSFET Q4, GND connects the source of MOSFET. This loop drives MOSFET Q4, turning MOSFET Q4 on.
In the other set of loops VCC-R1// R2-Q1-R5-R7-T1A PIN2-T1A PIN1-Q4-GND, the gate voltage of MOSFET Q4 is high and MOSFET Q4 is also conductive due to the conduction of transistor Q1. According to the principle of the same name, T1A PIN2 is positive, a T1B PIN3 PIN is also positive, and T1B PIN3-D2-R4// R8-HRB-HRS-T1B PIN4 forms a loop. HRB is also high and connects the gate of MOSFET Q4, and HRS connects the source of MOSFET. This loop drives MOSFET Q4, turning MOSFET Q4 on.
When the voltage at the PWM signal input transitions to zero, transistor Q2 is on, loop one: LRA-R3-R6// D1-Q2-GND discharge, which makes LRA low voltage. Turning off MOSFET Q4. And a second loop: the driving transformer T1 is reversed, T1Bpin3 is negative, T1Bpin4 is positive, the triode Q3 is conducted, HRB-R4// R8-Q3-HRS enables HRB voltage to be discharged and changed into low voltage, and the MOSFET Q4 is cut off.
To sum up, the utility model discloses switching power supply drive circuit changes MOS pipe Q4's drive circuit on original basis, lets MOS pipe Q4 drive simpler, removes a set of secondary coil and other components and parts, only adds a small amount of devices and just can reach same effect, has reduced the volume of circuit, the cost is reduced.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A switching power supply driving circuit is characterized by comprising a resistor R, a triode Q, a diode D, a transformer T and an MOS tube Q, wherein the resistor R is respectively provided with a power supply VCC and a resistor R, the other end of the resistor R is respectively connected with the other end of the resistor R and a collector of a triode Q, the base of the triode Q is respectively connected with the base of the triode Q and the resistor R, the collector of the triode Q is connected with the anode of the diode D and grounded, the emitter of the triode Q is respectively connected with the emitter of the triode Q, the cathode of the diode D, the cathode of the diode R and the resistor R, the other end of the resistor R is respectively connected with the anode of the diode D, the resistor R, the cathode of the MOS tube Q, the S pole of the MOS tube Q is grounded, the D pole of the MOS tube Q is respectively connected with the anode of the diode D and a primary side coil T1 of the transformer T, the, one end of a secondary side coil T1B of the transformer T1 is connected with the anodes of a resistor R9 and a diode D2 respectively, the cathode of a diode D2 is connected with a resistor R10, the emitter of a triode Q3, a resistor R4 and a resistor RS respectively, the other end of the resistor RS is connected with the other end of a resistor R4, the collector of the triode Q3 is connected with the anode of a diode D4 and the other end of a primary side coil T1A of the transformer T1 respectively, and the cathode of a diode D4 is connected with the other end of a resistor R9, the other end of a resistor R10 and the.
2. The switching power supply driving circuit according to claim 1, wherein the other end of the resistor R5 is a PWM signal input end.
3. The switching power supply driving circuit according to claim 2, wherein the transistor Q3 is a PNP transistor.
4. The switching power supply driving circuit according to claim 3, wherein the transistor Q1 and the transistor Q2 are NPN transistors.
5. The switching power supply driving circuit according to any one of claims 1 to 4, wherein the power supply VCC is a DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921403035.4U CN210724551U (en) | 2019-08-27 | 2019-08-27 | Switching power supply driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921403035.4U CN210724551U (en) | 2019-08-27 | 2019-08-27 | Switching power supply driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210724551U true CN210724551U (en) | 2020-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921403035.4U Active CN210724551U (en) | 2019-08-27 | 2019-08-27 | Switching power supply driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210724551U (en) |
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2019
- 2019-08-27 CN CN201921403035.4U patent/CN210724551U/en active Active
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