CN218482786U - Double-tube flyback topology circuit and flyback power supply using same - Google Patents
Double-tube flyback topology circuit and flyback power supply using same Download PDFInfo
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- CN218482786U CN218482786U CN202222433013.0U CN202222433013U CN218482786U CN 218482786 U CN218482786 U CN 218482786U CN 202222433013 U CN202222433013 U CN 202222433013U CN 218482786 U CN218482786 U CN 218482786U
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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
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- 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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Abstract
The utility model relates to a double-barrelled flyback topology circuit, it is connected between the primary side of advancing electric end and transformer, including MOS pipe, PNP triode, NPN triode, first resistance, second resistance, third resistance, first diode and second diode. Furthermore, the utility model discloses still relate to a flyback power supply, including advancing electric end, play electric end, PWM module, foretell flyback topology module, transformer and output rectifier and filter module. A double-switch tube is formed by the PNP triode and the NPN triode, and a double-tube flyback topological structure can be formed by the first diode, the second diode and the transformer, so that flyback noise is low, and reliability is high. The driving circuit can be formed by the MOS tube, the first resistor, the second resistor and the third resistor, and the problem of floating ground driving naturally carried by a double-switch tube flyback topology is effectively solved. The utility model discloses simple structure compares in current double-barrelled flyback circuit, has reduced the driven complexity, can further reduce the size of product, reduces product cost.
Description
Technical Field
The utility model relates to a power technical field especially relates to a double-barrelled flyback topology circuit and use its flyback power supply.
Background
Most of the traditional auxiliary power supplies for low-voltage and low-power electrical appliances are single-tube flyback power supplies, and have the defects of high noise, high voltage stress and the like. At present, most auxiliary power supplies of low-voltage low-power electric appliances are double-tube flyback power supplies, the double-tube flyback power supplies are based on a scheme that double MOS tubes are used as switching tubes, the problems of large noise and large voltage stress can be effectively solved, but the floating driving problem naturally carried by double-tube flyback topology exists, and compared with the problem, a common solution is to add an isolation driving chip or an isolation pulse driving transformer, so that the scheme cost and the circuit complexity are undoubtedly increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a double-barrelled flyback topology circuit and use its flyback power supply, it has remained double-barrelled flyback small in noise, advantage that the reliability is high, need not add isolation driver chip or keep apart pulse driver transformer and also can solve double-barrelled flyback topology and naturally have the ground drive problem of floating, and circuit structure is simpler, has reduced the complexity of circuit, and product cost is also lower.
In order to achieve the above object, the utility model discloses a double-barrelled flyback topology circuit connects between the primary side of advancing electric end and transformer, and it includes MOS pipe, PNP triode, NPN triode, first resistance, second resistance, third resistance, first diode and second diode.
The drain electrode of the MOS tube is connected with one end of a second resistor, the other end of the second resistor is connected with one end of a first resistor and the base electrode of the PNP triode, the other end of the first resistor is connected with the emitter electrode of the PNP triode and the positive electrode Vblk of the power-in end, the collector electrode of the PNP triode and the negative electrode of a first diode are connected with one end of the primary side of the transformer, and the positive electrode of the first diode is connected with the negative electrode GndBlk of the power-in end; the grid electrode of the MOS tube is used for receiving a PWM control signal; the source electrode of the MOS tube is connected with one end of a third resistor and the base electrode of the NPN triode, the other end of the third resistor and the emitting electrode of the NPN triode are connected with the negative electrode GndBlk of the power-in end, the collector electrode of the NPN triode and the positive electrode of a second diode are connected with the other end of the primary side of the transformer, and the negative electrode of the second diode is connected with the positive electrode Vblk of the power-in end.
The utility model also discloses a flyback power supply, it includes into electric end, play electric end, PWM module, flyback topology module, transformer and output rectification filter module, flyback topology module is foretell double-barrelled flyback topology circuit.
The PWM module is connected with a power inlet end to obtain power, the output end of the PMW module is connected with the grid electrode of the MOS tube, and the output end of the PWM module outputs a PWM control signal; in the flyback topology module, a positive electrode Vblk of a power inlet end is connected with an emitting electrode of a PNP triode and a negative electrode of a second diode, a collector electrode of the PNP triode is connected with one end of a primary side of a transformer, a negative electrode GndBlk of the power inlet end is connected with an emitting electrode of an NPN triode and a positive electrode of a first diode, and a collector electrode of the NPN triode is connected with the other end of the primary side of the transformer; and the power output end is connected with the secondary side of the transformer through the output rectifying and filtering module.
Preferably, the PWM module includes a chip IC104, a resistor R113, a capacitor C110, and a capacitor CF7; wherein, the pin 7 of the chip IC104 is connected with the positive electrode Vblk of the power input end, the pin 8 of the chip IC104 is connected with one end of a resistor R113 and one end of a capacitor CF7, the other end of the resistor R113 is connected with the pin 4 of the chip IC104 and one end of a capacitor C110, and the other end of the capacitor CF7, the other end of the capacitor C110 and the pin 5 of the chip IC104 are connected with the negative electrode GndBlk of the power input end; the 6 pins of the chip IC104 are connected with the gates of the MOS tubes.
Preferably, the model of the chip IC104 is UC3845.
Preferably, the power supply further comprises a starting voltage module, and the pin 7 of the chip IC104 is connected with the power input end positive electrode Vblk through the starting voltage module; the starting voltage module comprises a resistor R102, a filter capacitor C41 and a voltage stabilizing diode DZ1; one end of the resistor R102 is connected with the positive electrode Vblk of the power input end, and the other end of the resistor R102 is connected with the negative electrode of the voltage stabilizing diode DZ1, the positive electrode of the filter capacitor C41 and the pin 7 of the chip IC 104; the anode of the voltage-stabilizing diode DZ1 and the cathode of the filter capacitor C41 are connected with the cathode GndBlk of the power-in end.
Preferably, the current-limiting circuit further comprises an overcurrent protection module, an emitter of the NPN triode is connected with a negative electrode GndBlk of the power input end through the overcurrent protection module, and the overcurrent protection module is connected with the PWM module; the overcurrent protection module comprises a diode D3, a resistor R130, a resistor R135, a resistor R150 and a capacitor C118; an emitter of the NPN triode is connected to an anode of the diode D3, one end of the resistor R130, and one end of the resistor R150, the other end of the resistor R130 is connected to the pin 3 of the chip IC104 and one end of the capacitor C118, the other end of the capacitor C118 and the other end of the resistor R150 are connected to a negative electrode GndBlk of the power input terminal, and a negative electrode of the diode D3 is connected to the negative electrode GndBlk of the power input terminal through the resistor R135.
Preferably, the collector of the PNP triode is connected with pin 1 of the transformer, the collector of the NPN triode is connected with pin 3 of the transformer, and pin 2 of the transformer is suspended.
Preferably, the device further comprises a voltage feedback control module, wherein the voltage feedback control module comprises a schottky diode DS3, a diode D110, a resistor R119, a resistor R137, a resistor R146, a resistor R156, a capacitor C43 and a capacitor C114; the cathode of the schottky diode DS3 is connected to the pin 7 of the chip IC104, the anode of the schottky diode DS3 is connected to one end of the resistor R156, one end of the resistor R137, one end of the capacitor C43 and the cathode of the diode D100, the other end of the resistor R156 is connected to one end of the resistor R146, one end of the capacitor C114, one end of the resistor R119 and the pin 2 of the chip IC104, the other end of the resistor R119 is connected to the other end of the capacitor C114 and the pin 1 of the chip IC104, and the other end of the resistor R146 is connected to the other end of the resistor R137, the other end of the capacitor C43, the pin 5 of the transformer and the negative electrode GndBlk of the power input terminal; the anode of the diode D110 is connected to the 4-pin of the transformer.
Preferably, the power outlet end comprises a 24V end, a 12V end, a 5V end and a ground end; the output rectifying and filtering module comprises a diode D1, a diode D2, a diode D112, a filtering capacitor CE2, a filtering capacitor CE6, a filtering capacitor CE141, a capacitor C64, a capacitor C76, a resistor R151 and a resistor R108; the anode of the diode D2 is connected to the pin 10 of the transformer, and the cathode of the diode D2 is connected to the anode of the filter capacitor CE6, one end of the resistor R151 and the end of 24V; the anode of the diode D1 is connected with the pin 9 of the transformer, and the cathode of the diode D1 is connected with the anode of the filter capacitor CE2, one end of the capacitor C64 and the 12V end; the anode of the diode D112 is connected to the pin 7 of the transformer, and the cathode of the diode D112 is connected to the anode of the filter capacitor CE141, one end of the resistor R108, one end of the capacitor C76, and the 5V end; the negative electrode of the filter capacitor CE6 is connected to the other end of the resistor R151, the negative electrode of the filter capacitor CE2, the other end of the capacitor C64, the negative electrode of the filter capacitor CE141, the other end of the resistor R108, the other end of the capacitor C76, the pin 8 of the transformer, the pin 6 of the voltage regulator, and the ground terminal.
The utility model discloses following beneficial effect has:
the utility model discloses a PNP triode and NPN triode constitute two switch tubes, and first diode, second diode and transformer can constitute double-barrelled flyback topology structure in addition, flyback small in noise, reliability height. The driving circuit can be formed by the MOS tube, the first resistor, the second resistor and the third resistor, and the problem of floating ground driving naturally caused by a double-switch tube flyback topology is effectively solved. The utility model discloses simple structure compares in current double-barrelled flyback circuit, has reduced the driven complexity, can further reduce the size of product to reduce product cost.
Drawings
Fig. 1 is the schematic diagram of the dual-transistor flyback topology circuit of the present invention.
Fig. 2 is a schematic diagram of the flyback power supply of the present invention.
Description of the main part symbols:
the system comprises a starting voltage module 10, a PWM module 20, a flyback topology module 30, a voltage feedback control module 40, an overcurrent protection module 50 and an output rectifying and filtering module 60.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the utility model discloses a double-barrelled flyback topology circuit, it is connected between the elementary side of advancing electric end and transformer T1, advances electric end voltage and is 24V. The circuit comprises an MOS transistor Q1, a PNP triode Q3, an NPN triode Q5, a first resistor R34, a second resistor R4, a third resistor R38, a first diode D13 and a second diode D4.
The drain electrode of the MOS transistor Q1 is connected with one end of the second resistor R4, the other end of the second resistor R4 is connected with one end of the first resistor R34 and the base electrode of the PNP triode Q3, the other end of the first resistor R34 is connected with the emitter electrode of the PNP triode Q3 to form the positive electrode Vblk of the power-in end, the collector electrode of the PNP triode Q3 and the negative electrode of the first diode D13 are connected with one end of the primary side of the transformer T1, and the positive electrode of the first diode D13 is connected with the negative electrode GndBlk of the power-in end. The gate of the MOS transistor Q1 is configured to receive the PWM control signal. The source of the MOS transistor Q1 is connected to one end of the third resistor R38 and the base of the NPN transistor Q5, the other end of the third resistor R38 and the emitter of the NPN transistor Q5 are connected to the negative terminal GndBlk of the power input terminal, the collector of the NPN transistor Q5 and the anode of the second diode D4 are connected to the other end of the primary side of the transformer T1, and the cathode of the second diode D4 is connected to the positive terminal Vblk of the power input terminal. The secondary side of the transformer T1 is connected with a rectifying and filtering circuit which consists of a diode and a filtering capacitor, wherein the anode of the filtering capacitor is the output anode of the whole circuit, and the cathode of the filtering capacitor is the output cathode of the whole circuit.
When the PWM wave is a high level, the MOS transistor Q1 is turned on to drive the PNP transistor Q3 and the NPN transistor Q5 to be turned on, and at this time, the current loop of the primary side of the transformer T1 is: the positive pole Vblk of the power input terminal-PNP triode Q3-primary side of the transformer T1-NPN triode Q5-negative pole GndBlk of the power input terminal, which current loops to store energy for the primary side (primary winding) of the transformer T1. When the PWM wave is at a low level, the MOS transistor Q1 is turned off, the PNP transistor Q3 is turned off by the resistor R34, the NPN transistor Q5 is turned off by the resistor R38, and the current loop of the primary side of the transformer T1 is: the primary side of the transformer T1, the second diode D4, the positive electrode Vblk of the power input end, the negative electrode GndBlk of the power input end, and the first diode D13 are clamped, so that leakage inductance energy is fed back to the input, and the efficiency is improved. Meanwhile, a diode of the rectifying and filtering circuit is conducted, and the output filtering capacitor completes the charging process and provides energy for output. The PNP triode Q3 is used as an upper tube, and the base voltage of the PNP triode Q3 can be driven in a floating mode by pulling down.
Based on the same utility model discloses think, the utility model also discloses a flyback power supply, as shown in fig. 2. The flyback power supply comprises a power-in end, a power-out end, a starting voltage module 10, a PWM module 20, a flyback topology module 30, a voltage feedback control module, an overcurrent protection module 50, a transformer T1 and an output rectification filter module 60, wherein the flyback topology module 30 is a double-tube flyback topology circuit.
The PWM module 20 includes a chip IC104, a resistor R113, a capacitor C110, and a capacitor CF7, wherein the model of the chip IC104 is UC3845. Pin 7 of the chip IC104 is connected to the power-in terminal positive electrode Vblk through the starting voltage module 10, and specifically, the starting voltage module 10 includes a resistor R102, a filter capacitor C41, and a zener diode DZ1. One end of the resistor R102 is connected to the positive electrode Vblk of the power input end, and the other end of the resistor R102 is connected to the cathode of the zener diode DZ1, the anode of the filter capacitor C41, and the pin 7 of the chip IC 104. The anode of the voltage-stabilizing diode DZ1 and the cathode of the filter capacitor C41 are connected with the cathode GndBlk of the power-in end. The pin 8 of the chip IC104 is connected with one end of a resistor R113 and one end of a capacitor CF7, the other end of the resistor R113 is connected with the pin 4 of the chip IC104 and one end of a capacitor C110, and the other end of the capacitor CF7, the other end of the capacitor C110 and the pin 5 of the chip IC104 are connected with a negative electrode GndBlk of a power-in end. The 6 th pin of the chip IC104 is connected to the gate of the MOS transistor Q1.
When the positive electrode Vblk of the power input terminal is input, the starting voltage module 10 charges the filter capacitor C41. When the voltage of the filter capacitor C41 exceeds the start voltage of the chip IC104, the pin 6 of the chip IC104 outputs a PWM wave to drive the MOS transistor Q1, thereby controlling the conduction and the disconnection of the PNP transistor Q3 and the NPN transistor Q5.
In the flyback topology module 30, the positive electrode Vblk of the power input end is connected to the emitter of the PNP triode Q3 and the negative electrode of the second diode D4, the collector of the PNP triode Q3 is connected to one end (pin 1) of the primary side of the transformer T1, the negative electrode GndBlk of the power input end is connected to the positive electrode of the first diode D13, the collector of the NPN triode Q5 is connected to the other end (pin 3) of the primary side of the transformer T1, and pin 2 of the transformer T1 is suspended. An emitter of the NPN triode Q5 is connected to the negative electrode GndBlk of the power-in terminal through the current protection module 50. The connection relationship of other components in the flyback topology module 30 is the same as that of the dual-transistor flyback topology circuit described above. In addition, in order to ensure the stability of the input voltage, a capacitor C28 is connected in series between the emitter of the PNP transistor Q3 and the negative electrode GndBlk of the power-in terminal.
The overcurrent protection module 50 includes a diode D3, a resistor R130, a resistor R135, a resistor R150, and a capacitor C118. An emitter of the NPN triode Q5 is connected to an anode of the diode D3, one end of the resistor R130, and one end of the resistor R150, the other end of the resistor R130 is connected to a pin 3 of the chip IC104 and one end of the capacitor C118, the other end of the capacitor C118 and the other end of the resistor R150 are connected to a negative electrode gnlk of the power input terminal, and a negative electrode of the diode D3 is connected to the negative electrode dblk of the power input terminal through the resistor R135. When overcurrent occurs, the voltage of pin 3 of the chip IC104 exceeds 1V, and the chip IC104 turns off the PWM wave.
The voltage feedback control module comprises a schottky diode DS3, a diode D110, a resistor R119, a resistor R137, a resistor R146, a resistor R156, a capacitor C43 and a capacitor C114. The cathode of the schottky diode DS3 is connected to the pin 7 of the chip IC104, the anode of the schottky diode DS3 is connected to one end of the resistor R156, one end of the resistor R137, one end of the capacitor C43, and the cathode of the diode D100, the other end of the resistor R156 is connected to one end of the resistor R146, one end of the capacitor C114, one end of the resistor R119, and the pin 2 of the chip IC104, the other end of the resistor R119 is connected to the other end of the capacitor C114 and the pin 1 of the chip IC104, and the other end of the resistor R146 is connected to the other end of the resistor R137, the other end of the capacitor C43, the pin 5 of the transformer T1, and the cathode GndBlk of the power input terminal. The anode of the diode D110 is connected to the 4-pin of the transformer T1.
The power outlet end comprises a 24V end, a 12V end, a 5V end and a ground end, so that the power supply is integrally a multi-channel auxiliary power supply.
The output rectifying and filtering module 60 includes a diode D1, a diode D2, a diode D112, a filtering capacitor CE2, a filtering capacitor CE6, a filtering capacitor CE141, a capacitor C64, a capacitor C76, a resistor R151, and a resistor R108. The anode of the diode D2 is connected to the pin 10 of the transformer T1, and the cathode of the diode D2 is connected to the anode of the filter capacitor CE6, one end of the resistor R151, and the end 24V. The anode of the diode D1 is connected to pin 9 of the transformer T1, and the cathode of the diode D1 is connected to the anode of the filter capacitor CE2, one end of the capacitor C64, and the 12V end. The anode of the diode D112 is connected to the pin 7 of the transformer T1, and the cathode of the diode D112 is connected to the anode of the filter capacitor CE141, one end of the resistor R108, one end of the capacitor C76, and the 5V end. The negative electrode of the filter capacitor CE6 is connected to the other end of the resistor R151, the negative electrode of the filter capacitor CE2, the other end of the capacitor C64, the negative electrode of the filter capacitor CE141, the other end of the resistor R108, the other end of the capacitor C76, the pin 8 of the transformer T1, the pin 6 of the voltage regulator, and the ground. In addition, the pin 8 of the transformer T1 is short-circuited again with the pin 6 of the transformer.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (9)
1. The utility model provides a double-barrelled flyback topology circuit, connects between the primary side of incoming end and transformer which characterized in that: the circuit comprises an MOS tube, a PNP triode, an NPN triode, a first resistor, a second resistor, a third resistor, a first diode and a second diode;
the other end of the first resistor and an emitter of the PNP triode are connected with a positive electrode Vblk of a power-in end, a collector of the PNP triode and a negative electrode of the first diode are connected with one end of a primary side of the transformer, and a positive electrode of the first diode is connected with a negative electrode GndBlk of the power-in end; the grid electrode of the MOS tube is used for receiving a PWM control signal; the source electrode of the MOS tube is connected with one end of a third resistor and the base electrode of the NPN triode, the other end of the third resistor and the emitting electrode of the NPN triode are connected with the negative electrode GndBlk of the power input end, the collector electrode of the NPN triode and the positive electrode of a second diode are connected with the other end of the primary side of the transformer, and the negative electrode of the second diode is connected with the positive electrode Vblk of the power input end.
2. A flyback power supply, characterized by: the flyback converter comprises an electricity inlet end, an electricity outlet end, a PWM module, a flyback topology module, a transformer and an output rectification filter module, wherein the flyback topology module is a double-tube flyback topology circuit according to claim 1;
the PWM module is connected with a power inlet end to get power, the output end of the PWM module is connected with the grid electrode of the MOS tube, and the output end of the PWM module outputs a PWM control signal; in the flyback topology module, a positive electrode Vblk of a power inlet end is connected with an emitting electrode of a PNP triode and a negative electrode of a second diode, a collector electrode of the PNP triode is connected with one end of the primary side of a transformer, a negative electrode GndBlk of the power inlet end is connected with an emitting electrode of an NPN triode and a positive electrode of a first diode, and a collector electrode of the NPN triode is connected with the other end of the primary side of the transformer; and the power output end is connected with the secondary side of the transformer through the output rectifying and filtering module.
3. The flyback power supply of claim 2, wherein: the PWM module comprises a chip IC104, a resistor R113, a capacitor C110 and a capacitor CF7; wherein, the pin 7 of the chip IC104 is connected with the positive electrode Vblk of the power input end, the pin 8 of the chip IC104 is connected with one end of a resistor R113 and one end of a capacitor CF7, the other end of the resistor R113 is connected with the pin 4 of the chip IC104 and one end of a capacitor C110, and the other end of the capacitor CF7, the other end of the capacitor C110 and the pin 5 of the chip IC104 are connected with the negative electrode GndBlk of the power input end; the 6 pins of the chip IC104 are connected with the gates of the MOS tubes.
4. The flyback power supply of claim 3, wherein: the model of the chip IC104 is UC3845.
5. The flyback power supply of claim 3 or 4, wherein: the power supply circuit also comprises a starting voltage module, wherein a pin 7 of the chip IC104 is connected with the positive electrode Vblk of the power input end through the starting voltage module; the starting voltage module comprises a resistor R102, a filter capacitor C41 and a voltage stabilizing diode DZ1; one end of the resistor R102 is connected with the positive electrode Vblk of the power input end, and the other end of the resistor R102 is connected with the negative electrode of the voltage stabilizing diode DZ1, the positive electrode of the filter capacitor C41 and the pin 7 of the chip IC 104; the anode of the voltage stabilizing diode DZ1 and the cathode of the filter capacitor C41 are connected with the cathode GndBlk of the power-in end.
6. The flyback power supply of claim 3 or 4, wherein: the NPN triode is connected with the negative electrode GndBlk of the power input end through the overcurrent protection module, and the overcurrent protection module is connected with the PWM module; the overcurrent protection module comprises a diode D3, a resistor R130, a resistor R135, a resistor R150 and a capacitor C118; an emitter of the NPN triode is connected to an anode of the diode D3, one end of the resistor R130, and one end of the resistor R150, the other end of the resistor R130 is connected to the pin 3 of the chip IC104 and one end of the capacitor C118, the other end of the capacitor C118 and the other end of the resistor R150 are connected to a negative electrode GndBlk of the power input terminal, and a negative electrode of the diode D3 is connected to the negative electrode GndBlk of the power input terminal through the resistor R135.
7. The flyback power supply of claim 3 or 4, wherein: the collector of the PNP triode is connected with the pin 1 of the transformer, the collector of the NPN triode is connected with the pin 3 of the transformer, and the pin 2 of the transformer is suspended.
8. The flyback power supply of claim 3 or 4, wherein: the voltage feedback control module comprises a Schottky diode DS3, a diode D110, a resistor R119, a resistor R137, a resistor R146, a resistor R156, a capacitor C43 and a capacitor C114; the cathode of the schottky diode DS3 is connected to the pin 7 of the chip IC104, the anode of the schottky diode DS3 is connected to one end of the resistor R156, one end of the resistor R137, one end of the capacitor C43 and the cathode of the diode D100, the other end of the resistor R156 is connected to one end of the resistor R146, one end of the capacitor C114, one end of the resistor R119 and the pin 2 of the chip IC104, the other end of the resistor R119 is connected to the other end of the capacitor C114 and the pin 1 of the chip IC104, and the other end of the resistor R146 is connected to the other end of the resistor R137, the other end of the capacitor C43, the pin 5 of the transformer and the negative electrode GndBlk of the power input terminal; the anode of the diode D110 is connected to the 4-pin of the transformer.
9. The flyback power supply of claim 2, wherein: the power output end comprises a 24V end, a 12V end, a 5V end and a ground end; the output rectifying and filtering module comprises a diode D1, a diode D2, a diode D112, a filtering capacitor CE2, a filtering capacitor CE6, a filtering capacitor CE141, a capacitor C64, a capacitor C76, a resistor R151 and a resistor R108; the anode of the diode D2 is connected to the pin 10 of the transformer, and the cathode of the diode D2 is connected to the anode of the filter capacitor CE6, one end of the resistor R151, and the end 24V; the anode of the diode D1 is connected with the pin 9 of the transformer, and the cathode of the diode D1 is connected with the anode of the filter capacitor CE2, one end of the capacitor C64 and the 12V end; the anode of the diode D112 is connected with the pin 7 of the transformer, and the cathode of the diode D112 is connected with the anode of the filter capacitor CE141, one end of the resistor R108, one end of the capacitor C76 and the 5V end; the negative electrode of the filter capacitor CE6 is connected to the other end of the resistor R151, the negative electrode of the filter capacitor CE2, the other end of the capacitor C64, the negative electrode of the filter capacitor CE141, the other end of the resistor R108, the other end of the capacitor C76, the pin 8 of the transformer, the pin 6 of the transformer, and the ground terminal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222433013.0U CN218482786U (en) | 2022-09-14 | 2022-09-14 | Double-tube flyback topology circuit and flyback power supply using same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222433013.0U CN218482786U (en) | 2022-09-14 | 2022-09-14 | Double-tube flyback topology circuit and flyback power supply using same |
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| CN218482786U true CN218482786U (en) | 2023-02-14 |
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