CN215871200U - Double-tube series flyback switching power supply driving circuit and switching power supply - Google Patents
Double-tube series flyback switching power supply driving circuit and switching power supply Download PDFInfo
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- CN215871200U CN215871200U CN202122243554.2U CN202122243554U CN215871200U CN 215871200 U CN215871200 U CN 215871200U CN 202122243554 U CN202122243554 U CN 202122243554U CN 215871200 U CN215871200 U CN 215871200U
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Abstract
The utility model discloses a double-tube series flyback switching power supply driving circuit and a switching power supply, which comprise a power supply controller, a power amplifier circuit, a driving isolation circuit and an IGBT double-tube series circuit, wherein the power supply controller and the power amplifier circuit are connected with the IGBT double-tube series circuit through the driving isolation circuit; the chip U1 of the power supply controller outputs a PWM signal to a power amplifier chip U2 of the power amplifier circuit through a resistor Rb of the power amplifier circuit; the IGBT double-tube voltage stabilizing circuit comprises a Q1 and a Q2 connected with a Q1 in series. The transmission of the driving signal of the driving circuit and the establishment of the secondary side driving voltage share one transformer, so that the structure of the driving circuit is greatly simplified, the driving insulation distance is effectively ensured, the design on a PCB is optimized, and the cost is saved; make the associated circuit of the driving signal safe and reliable; the common IGBT can bear bus voltage stress higher than 1200V after being connected in series, the IGBT type selection range is widened, the cost and the design difficulty are reduced, and the use reliability of the circuit is improved.
Description
Technical Field
The present invention relates to a driving circuit of a flyback switching power supply, and more particularly, to a driving circuit of a flyback switching power supply with two transistors connected in series and a switching power supply.
Background
The flyback transformer switching power supply is characterized in that when a primary coil of a transformer is just excited by direct-current pulse voltage, a secondary coil of the transformer does not provide power output for a load, and the power output is provided for the load only after the excitation voltage of the primary coil of the transformer is turned off.
In a flyback switching power supply product, if the bus voltage is higher, the switching tube cannot be an MOS tube, but an IGBT (insulated gate bipolar transistor) is selected because the voltage level of the IGBT is higher than that of the MOS tube. At present, the voltage class of the IGBT is 1700V or below, the IGBT is mature and reliable and complete in variety, but the IGBT is only suitable for bus voltage below 1200V, and in the technical field of flyback switching power supplies with bus voltage exceeding 1200V, because the IGBT is limited by the voltage class limit, the type selection is difficult, and the cost is increased, many research and development personnel try to use an IGBT double-tube series connection voltage division mode to adapt to higher bus voltage. The key of the series application of the two IGBT tubes is to ensure the voltage balance of the two IGBTs in the switching dynamic state and the working steady state, so the requirement on the consistency of the driving voltage is higher, and the design difficulty is greatly increased. In addition, the IGBT double-tube series connection is generally applied to occasions with higher bus voltage, drive isolation is needed, the drive isolation technology is mainly used for electrically isolating a front-stage drive signal from a rear-stage high voltage, safety standards are met, system reliability is enhanced, and the existing product is difficult to meet requirements.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a double-tube series flyback switching power supply driving circuit and a switching power supply.
In order to solve the technical problems, the utility model provides the following technical scheme:
the utility model relates to a double-tube series flyback switching power supply driving circuit, which comprises a power supply controller, a power amplifier circuit, a driving isolation circuit and an IGBT double-tube series circuit, wherein,
the power controller and the power amplifier circuit are connected with the IGBT double-tube series circuit through the drive isolation circuit;
the chip U1 of the power supply controller outputs a PWM signal to a power amplifier chip U2 of the power amplifier circuit through a resistor Rb of the power amplifier circuit, an Out pin of the power amplifier chip U2 is connected with a capacitor C1, and one end of the power amplifier chip U2 is grounded;
the power amplifier circuit comprises a power amplifier chip U2, a capacitor Cbias, a capacitor Cdrv, a resistor R and the resistor Rb, wherein,
the capacitor Cbias is connected in parallel between the chip U1 of the power controller and the power amplifier chip U2 of the power amplifier circuit, the resistor R is connected in series between the Vcc pin of the chip U1 of the power controller and the Vcc pin of the power amplifier chip U2, the Vcc pin of the power amplifier chip U2 is connected with the capacitor Cdrv, and one end of the capacitor Cdrv is grounded;
the driving isolation circuit comprises a capacitor C1, an isolation transformer T1, a voltage regulator tube Z1a, a voltage regulator tube Z1b, a voltage regulator tube Z2a, a voltage regulator tube Z2b, a diode D1, a diode D2, a triode Qoff1, a triode Qoff2, a resistor Rg1, a resistor Rg2, a resistor Rge1 and a resistor Rge2, wherein,
the isolation transformer T1 connects the Q1 and Q2 of the IGBT two-transistor series circuit,
a capacitor C1 is arranged between the power amplifier circuit and the drive isolation circuit, and one end of the capacitor C1 is grounded;
the IGBT double-tube voltage stabilizing circuit comprises a Q1 and a Q2 connected with the Q1 in series.
As a preferred technical solution of the present invention, the driving isolation circuit includes a first isolation circuit and a second isolation circuit;
the isolation transformer T1 is formed with a first driving voltage Drive V1 corresponding to a first isolation circuit and a second driving voltage Drive V2 corresponding to a second isolation circuit, wherein,
the first isolation circuit comprises a voltage regulator tube Z1a, a voltage regulator tube Z1b, a triode Qoff1 and a resistor Rge1 which are connected in parallel with the Q1,
the first isolation circuit connects pin G and pin E of the Q1,
a diode D1 and the resistor Rg1 are connected in series between the first isolation circuit and a pin G of the Q1;
the second isolation circuit comprises a voltage regulator tube Z2a, a voltage regulator tube Z2b, a triode Qoff2 and a resistor Rge2 which are connected in parallel with the Q2,
the second isolation circuit connects pin G and pin E of the Q2,
a diode D2 and the resistor Rg2 are connected in series between the second isolation circuit and a pin G of the Q2;
the diode D1 is installed between the B pole and the E pole of the transistor Qoff1, and the C pole of the transistor Qoff1 is connected to the connection line between the first isolation circuit and the pin E of the Q1;
the diode D2 is installed between the B pole and the E pole of the transistor Qoff2, and the C pole of the transistor Qoff2 is connected to the connection line between the second isolation circuit and the pin E of the Q2;
one end of the second isolation circuit is grounded;
the isolation transformer T1 includes a primary side N1, a secondary side N2, and a secondary side N3, wherein,
the secondary side N2 is connected to the first isolation circuit,
the secondary side N3 is connected to the second isolation circuit.
As a preferred technical solution of the present invention, the chip U1 of the power controller includes one or more of a PWM dedicated chip, a DSP chip, an ARM chip, or an FPGA chip.
As a preferred aspect of the present invention, the IGBT two-transistor series circuit is connected to a flyback transformer T2, wherein,
the Q1 is connected in series with a pin 2 of the flyback transformer T2, and a pin 1 of the flyback transformer is connected with the anode of the bus voltage.
The utility model also provides a double-tube series flyback switching power supply which is provided with the driving circuit.
The utility model has the following beneficial effects: the transmission of the driving signal of the driving circuit and the establishment of the secondary side driving voltage share one transformer, so that the structure of the driving circuit is greatly simplified, the driving insulation distance is effectively ensured, the design on a PCB is optimized, and the cost is saved; the consistency of the driving voltage of the IGBT double-tube series circuit is ensured, and simultaneously, the front-stage driving signal and the rear-stage driving signal are isolated, so that the associated circuit of the driving signal is safe and reliable; the synchronous on and off of the IGBT double-tube series connection can be well realized, and the voltage division of the IGBT double-tube series connection is further realized, so that the common IGBT can bear bus voltage stress higher than 1200V after being connected in series, the IGBT type selection range is widened, the cost and the design difficulty are reduced, and the use reliability of the circuit is improved; the method can be suitable for photovoltaic power generation systems, electric vehicle charging systems, electric energy storage systems, high-voltage frequency conversion systems and the like with higher bus voltage; the single-tube IGBT only needs to bear about half of peak voltage, and in a system with high bus voltage and higher reliability requirement, the circuit can achieve high-level derating design requirement, thereby meeting the high reliability requirement provided by the system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
fig. 1 is a block diagram of a driving circuit of a double-tube series flyback switching power supply of the present invention;
FIG. 2 is a schematic diagram of a power supply controller and a power amplifier circuit according to the present invention;
fig. 3 is a schematic diagram of a drive isolation circuit and IGBT double-tube series circuit of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
As shown in fig. 1 to 3, the present invention provides a double-transistor series flyback switching power supply driving circuit and a switching power supply, including a power controller, a power amplifier circuit, a driving isolation circuit and an IGBT double-transistor series circuit, wherein,
the power supply controller and the power amplifier circuit are connected with the IGBT double-tube series circuit through the driving isolation circuit;
the chip U1 of the power controller outputs a PWM Signal to a power amplifier chip U2 of the power amplifier circuit through a resistor Rb of the power amplifier circuit, specifically, the PWM Signal is output by an Out pin of the chip U1 of the power controller, the Signal is transmitted to the power amplifier chip U2 through the resistor Rb, and the power amplifier chip U2 enhances the PWM Signal and then outputs a Signal Drive Signal through an Out pin of the power amplifier chip U2;
the driving isolation circuit comprises a first isolation circuit and a second isolation circuit; the isolation transformer T1 is provided with a first driving voltage Drive V1 corresponding to a first isolation circuit and a second driving voltage Drive V2 corresponding to a second isolation circuit, wherein the first isolation circuit comprises a voltage regulator tube Z1a, a voltage regulator tube Z1b, a triode Qoff1 and a resistor Rge1 which are connected in parallel with a Q1, the first isolation circuit is connected with a pin G and a pin E of the Q1, and a diode D1 and a resistor Rg1 are connected in series between the first isolation circuit and the pin G of the Q1;
the second isolation circuit comprises a voltage regulator tube Z2a, a voltage regulator tube Z2b, a triode Qoff2 and a resistor Rge2 which are connected with the Q2 in parallel, the second isolation circuit is connected with a pin G and a pin E of the Q2, and a diode D2 and a resistor Rg2 are connected between the second isolation circuit and the pin G of the Q2 in series;
the diode D1 is installed between the B pole and the E pole of the triode Qoff1, and the C pole of the triode Qoff1 is connected to a connecting line between the first isolating circuit and the pin E of the Q1; the diode D2 is installed between the B pole and the E pole of the triode Qoff2, and the C pole of the triode Qoff2 is connected to a connecting line between the second isolating circuit and the pin E of the Q2; one end of the second isolation circuit is grounded.
A Signal Drive Signal output by the power amplifier chip U2 is transmitted to a primary side of an isolation transformer T1 through a capacitor C1, and meanwhile, 2 synchronous driving voltages are formed on a secondary side of the isolation transformer T1, namely a first driving voltage Drive V1 and a second driving voltage Drive V2 are formed on the isolation transformer T1; an Out pin of the power amplifier chip U2 is connected with a capacitor C1, and one end of the power amplifier chip U2 is grounded;
the power amplifier circuit comprises a power amplifier chip U2, a capacitor Cbias, a capacitor Cdrv, a resistor R and a resistor Rb, and is used for isolating the driving signal from the subsequent high voltage, wherein,
a chip U1 of the power controller and a power amplifier chip U2 of the power amplifier circuit are connected in parallel and connected with a capacitor Cbias in parallel, a resistor R is connected in series between a Vcc pin of the power controller chip U1 and a Vcc pin of the power amplifier chip U2, the Vcc pin of the power amplifier chip U2 is connected with a capacitor Cdrv, and one end of the capacitor Cdrv is grounded;
the driving isolation circuit comprises a capacitor C1, an isolation transformer T1, a voltage regulator tube Z1a, a voltage regulator tube Z1b, a voltage regulator tube Z2a, a voltage regulator tube Z2b, a diode D1, a diode D2, a triode Qoff1, a triode Qoff2, a resistor Rg1, a resistor Rg2, a resistor Rge1 and a resistor Rge2, wherein,
the isolation transformer T1 connects Q1 and Q2 of the IGBT two-transistor series circuit,
a capacitor C1 is arranged between the power amplifier circuit and the drive isolation circuit, and one end of the capacitor C1 is grounded;
the isolation transformer T1 includes a primary side N1, a secondary side N2, and a secondary side N3, wherein,
the secondary side N2 is connected to the first isolation circuit,
the secondary side N3 is connected to the second isolation circuit.
The IGBT double-tube voltage stabilizing circuit comprises a Q1 and a Q2 which is connected with a Q1 in series and is a switching tube of a main power loop, and the circuit in the embodiment can control synchronous on and synchronous off of the circuit.
The diode D1 and the resistor Rg1 are connected to a pin G and a pin E of the Q1, if a driving signal output by the power supply controller is an on pulse, the first driving voltage Drive V1 is a positive pulse driving voltage, voltage stabilization is realized by a voltage regulator tube Z1a, the positive pulse driving voltage is transmitted to two ends of a pin G, E of the Q1 through the diode D1 and the resistor Rg1, Q1 of the IGBT double-tube series circuit is conducted, and the first driving voltage Drive V1 and the second driving voltage Drive V2 are synchronously formed and Drive isolation circuits are completely the same, so that the Q2 of the IGBTT double-tube series circuit is synchronously conducted.
The triode Qoff1 and the resistor Rg1 are connected with a pin G and a pin E of the Q1, if a driving signal output by the power supply controller is an off pulse, a first driving voltage Drive V1 is a negative pulse driving voltage, voltage stabilization is realized by a voltage stabilizing tube Z1b, the voltage stabilizing voltage is transmitted to two ends of a pin G, E of a Q1 of the IGBT double-tube series circuit through the triode Qoff1 and the resistor Rg1, and the Q1 of the IGBT double-tube series circuit is turned off. Because the first driving voltage Drive V1 and the second driving voltage Drive V2 are synchronously formed and the driving isolation circuits are completely the same, the Q2 of the IGBTT double-tube series circuit is synchronously turned off, and the voltage division function of the IGBT double-tube series circuit is realized.
The power controller chip U1 includes one or more of a PWM specific chip, a DSP chip, an ARM chip or an FPGA chip for providing, adjusting and turning off the driving signals.
The IGBT two-transistor series circuit is connected to a flyback transformer T2, where Q1 is connected in series with pin 2 of flyback transformer T2, and pin 1 of the flyback transformer is connected to the positive pole of the bus voltage.
Specifically, the power supply controller and the power amplifier circuit are connected with the IGBT double-tube series circuit through the driving isolation circuit; the chip U1 of the power controller outputs a PWM Signal to a power amplifier chip U2 of the power amplifier circuit through a resistor Rb of the power amplifier circuit, specifically, the PWM Signal is output by an Out pin of a chip U1 of the power controller, the Signal is transmitted to the power amplifier chip U2 through the resistor Rb, the power amplifier chip U2 enhances the PWM Signal and outputs a Signal Drive Signal through an Out pin of the power amplifier chip U2, the power amplifier chip U2 is connected with a capacitor C1 of a driving isolation circuit, wherein the capacitor C1 is connected to an isolation transformer T1 of the driving isolation circuit, the Signal Drive Signal output by the power amplifier chip U2 is transmitted to a primary side of the isolation transformer T1 through the capacitor C1, meanwhile, 2 synchronous driving voltages are formed on a secondary side of the isolation transformer T1, namely, and a first driving voltage Drive V1 and a second driving voltage Drive V2 are formed on the isolation transformer T1; the diode D1 and the resistor Rg1 are connected to a pin G and a pin E of the Q1, if a driving signal output by the power supply controller is an on pulse, the first driving voltage Drive V1 is a positive pulse driving voltage, voltage stabilization is realized by a voltage regulator tube Z1a, the positive pulse driving voltage is transmitted to two ends of a pin G, E of the Q1 through the diode D1 and the resistor Rg1, Q1 of the IGBT double-tube series circuit is conducted, and the first driving voltage Drive V1 and the second driving voltage Drive V2 are synchronously formed and Drive isolation circuits are completely the same, so that the Q2 of the IGBTT double-tube series circuit is synchronously conducted. The triode Qoff1 and the resistor Rg1 are connected with a pin G and a pin E of the Q1, if a driving signal output by the power supply controller is an off pulse, a first driving voltage Drive V1 is a negative pulse driving voltage, voltage stabilization is realized by a voltage stabilizing tube Z1b, the voltage stabilizing voltage is transmitted to two ends of a pin G, E of a Q1 of the IGBT double-tube series circuit through the triode Qoff1 and the resistor Rg1, and the Q1 of the IGBT double-tube series circuit is turned off. Because the first driving voltage Drive V1 and the second driving voltage Drive V2 are synchronously formed and the driving isolation circuits are completely the same, the Q2 of the IGBTT double-tube series circuit is synchronously turned off, and the voltage division function of the IGBT double-tube series circuit is realized.
The transmission of the driving signal of the driving circuit and the establishment of the secondary side driving voltage share one transformer, so that the structure of the driving circuit is greatly simplified, the driving insulation distance is effectively ensured, the design on a PCB is optimized, and the cost is saved; the consistency of the driving voltage of the IGBT double-tube series circuit is ensured, and simultaneously, the front-stage driving signal and the rear-stage driving signal are isolated, so that the associated circuit of the driving signal is safe and reliable; the synchronous on and off of the IGBT double-tube series connection can be well realized, and the voltage division of the IGBT double-tube series connection is further realized, so that the common IGBT can bear bus voltage stress higher than 1200V after being connected in series, the IGBT type selection range is widened, the cost and the design difficulty are reduced, and the use reliability of the circuit is improved; the method can be suitable for photovoltaic power generation systems, electric vehicle charging systems, electric energy storage systems, high-voltage frequency conversion systems and the like with higher bus voltage; the single-tube IGBT only needs to bear about half of peak voltage, and in a system with high bus voltage and higher reliability requirement, the circuit can achieve high-level derating design requirement, thereby meeting the high reliability requirement provided by the system.
Example 2
A double-tube series flyback switching power supply is provided with a driving circuit in embodiment 1, so that a more simplified driving circuit structure can be realized, the driving insulation distance is effectively ensured, and the cost is reduced; the associated circuit of the driving signal is safe and reliable; the synchronous on and off of the IGBT double-tube series connection can be realized better, and the voltage division of the IGBT double-tube series connection is further realized; the method can be suitable for photovoltaic power generation systems, electric vehicle charging systems, electric energy storage systems, high-voltage frequency conversion systems and the like with higher bus voltage; the single-tube IGBT only needs to bear about half of peak voltage, and in a system with high bus voltage and higher reliability requirement, the switch power supply can achieve high-level derating design requirement, so that the high reliability requirement provided by the system is met.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A double-tube series flyback switching power supply driving circuit is characterized by comprising a power supply controller, a power amplifier circuit, a driving isolation circuit and an IGBT double-tube series circuit, wherein,
the power controller and the power amplifier circuit are connected with the IGBT double-tube series circuit through the drive isolation circuit;
the chip U1 of the power supply controller outputs a PWM signal to a power amplifier chip U2 of the power amplifier circuit through a resistor Rb of the power amplifier circuit, an Out pin of the power amplifier chip U2 is connected with a capacitor C1, and one end of the power amplifier chip U2 is grounded;
the power amplifier circuit comprises a power amplifier chip U2, a capacitor Cbias, a capacitor Cdrv, a resistor R and the resistor Rb, wherein,
the capacitor Cbias is connected in parallel between the chip U1 of the power controller and the power amplifier chip U2 of the power amplifier circuit, the resistor R is connected in series between the Vcc pin of the chip U1 of the power controller and the Vcc pin of the power amplifier chip U2, the Vcc pin of the power amplifier chip U2 is connected with the capacitor Cdrv, and one end of the capacitor Cdrv is grounded;
the driving isolation circuit comprises a capacitor C1, an isolation transformer T1, a voltage regulator tube Z1a, a voltage regulator tube Z1b, a voltage regulator tube Z2a, a voltage regulator tube Z2b, a diode D1, a diode D2, a triode Qoff1, a triode Qoff2, a resistor Rg1, a resistor Rg2, a resistor Rge1 and a resistor Rge2, wherein,
the isolation transformer T1 connects the Q1 and Q2 of the IGBT two-transistor series circuit,
a capacitor C1 is arranged between the power amplifier circuit and the drive isolation circuit, and one end of the capacitor C1 is grounded;
the IGBT double-tube voltage stabilizing circuit comprises a Q1 and a Q2 connected with the Q1 in series;
the driving isolation circuit comprises a first isolation circuit and a second isolation circuit;
the isolation transformer T1 is formed with a first driving voltage Drive V1 corresponding to a first isolation circuit and a second driving voltage Drive V2 corresponding to a second isolation circuit, wherein,
the first isolation circuit comprises a voltage regulator tube Z1a, a voltage regulator tube Z1b, a triode Qoff1 and a resistor Rge1 which are connected with the Q1 in parallel,
the first isolation circuit connects pin G and pin E of the Q1,
a diode D1 and the resistor Rg1 are connected in series between the first isolation circuit and a pin G of the Q1;
the second isolation circuit comprises a voltage regulator tube Z2a, a voltage regulator tube Z2b, a triode Qoff2 and a resistor Rge2 which are connected with the Q2 in parallel,
the second isolation circuit connects pin G and pin E of the Q2,
a diode D2 and the resistor Rg2 are connected in series between the second isolation circuit and a pin G of the Q2;
the diode D1 is installed between the B pole and the E pole of the transistor Qoff1, and the C pole of the transistor Qoff1 is connected to the connection line between the first isolation circuit and the pin E of the Q1;
the diode D2 is installed between the B pole and the E pole of the transistor Qoff2, and the C pole of the transistor Qoff2 is connected to the connection line between the second isolation circuit and the pin E of the Q2;
one end of the second isolation circuit is grounded;
the isolation transformer T1 includes a primary side N1, a secondary side N2, and a secondary side N3, wherein,
the secondary side N2 is connected to the first isolation circuit,
the secondary side N3 is connected to the second isolation circuit.
2. The driving circuit of the double-transistor series flyback switching power supply as claimed in claim 1, wherein the chip U1 of the power supply controller comprises one or more of a PWM specific chip, a DSP chip, an ARM chip or an FPGA chip.
3. The driving circuit of claim 1, wherein the IGBT two-transistor series circuit is connected to a flyback transformer T2, wherein,
the Q1 is connected in series with a pin 2 of the flyback transformer T2, and a pin 1 of the flyback transformer is connected with the anode of the bus voltage.
4. A double-transistor series flyback switching power supply having a driver circuit as claimed in any one of claims 1 to 3.
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| CN202122243554.2U CN215871200U (en) | 2021-09-16 | 2021-09-16 | Double-tube series flyback switching power supply driving circuit and switching power supply |
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| CN202122243554.2U CN215871200U (en) | 2021-09-16 | 2021-09-16 | Double-tube series flyback switching power supply driving circuit and switching power supply |
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