CN222192126U - Flyback power supply circuit - Google Patents
Flyback power supply circuit Download PDFInfo
- Publication number
- CN222192126U CN222192126U CN202420766344.2U CN202420766344U CN222192126U CN 222192126 U CN222192126 U CN 222192126U CN 202420766344 U CN202420766344 U CN 202420766344U CN 222192126 U CN222192126 U CN 222192126U
- Authority
- CN
- China
- Prior art keywords
- module
- electrically connected
- power supply
- supply circuit
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004804 winding Methods 0.000 claims abstract description 91
- 230000000087 stabilizing effect Effects 0.000 claims description 57
- 238000005070 sampling Methods 0.000 claims description 21
- 230000001629 suppression Effects 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 9
- 230000004044 response Effects 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims 2
- 238000011105 stabilization Methods 0.000 claims 2
- 239000003381 stabilizer Substances 0.000 abstract 4
- 230000000903 blocking effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The application discloses a flyback power supply circuit which comprises a driving chip, a linear voltage stabilizer circuit, a switching module and a switching module, wherein a first end of the linear voltage stabilizer circuit is electrically connected with an input power supply end, a second end of the linear voltage stabilizer circuit is electrically connected with a power input end of the driving chip, a third end of the linear voltage stabilizer circuit is electrically connected with a grounding end and used for maintaining the potential of the power input end of the driving chip, the driving chip responds to the potential of the power input end of the driving chip and outputs a driving signal, the switching module comprises a primary winding and a secondary winding, the first end of the primary winding is electrically connected with the input power supply end, the secondary winding is electrically connected with the output power supply end, and the switching module is used for responding to the enabling level conduction of the driving signal output by the driving signal output end and communicating the primary winding with the grounding end. The flyback power supply circuit provided by the embodiment of the application can maintain the on-resistance of the switch module in a better range, thereby reducing the on-loss of the switch module.
Description
Technical Field
The application belongs to the technical field of power electronics, and particularly relates to a flyback power supply circuit.
Background
In general, in the existing household storage energy storage series, in the process that the flyback power supply circuit supplies power to the driving chip at the power supply end, the power supply voltage cannot be ensured to be stabilized in a specific section, and further, because the voltage for the driving chip cannot be ensured to be in a stable section, the high level of the driving chip when the driving chip sends out the PWM wave cannot be ensured to be in a stable section, the on-resistance of the transistor for receiving the PWM wave cannot be maintained in an optimal section, so that the on-loss of the transistor is increased, and the heating is increased.
Disclosure of utility model
The embodiment of the application provides a flyback power supply circuit, which can stabilize the potential of a power input end of a driving chip in a specific interval through a linear voltage stabilizing sub-circuit, further maintain the on-resistance of a switch module in a better interval, and further reduce the on-loss of the switch module.
In a first aspect, the embodiment of the application provides a flyback power supply circuit, which comprises a driving chip, a linear voltage stabilizing sub-circuit, a switching module and a switching module, wherein a first end of the linear voltage stabilizing sub-circuit is electrically connected with an input power supply end, a second end of the linear voltage stabilizing sub-circuit is electrically connected with a power input end of the driving chip, a third end of the linear voltage stabilizing sub-circuit is electrically connected with a grounding end, the linear voltage stabilizing sub-circuit is used for maintaining the potential of the power input end of the driving chip, the driving chip is used for responding to the potential of the power input end of the driving chip and outputting a driving signal, the switching module comprises a primary winding and a secondary winding, the first end of the primary winding is electrically connected with the input power supply end, the secondary winding is electrically connected with the output power supply end, the control end of the switching module is electrically connected with the driving signal output end of the driving chip, the first end of the switching module is electrically connected with the grounding end, and the second end of the switching module is electrically connected with the second end of the primary winding and is used for responding to the enabling level of the driving signal output by the driving signal output end, and the primary winding is communicated with the grounding end.
According to the embodiment of the first aspect of the application, the linear voltage stabilizing sub-circuit comprises a first current limiting module, a first charging and discharging module, a voltage stabilizing module, a transistor, a control end of the transistor, a power input end of a driving chip, a second current limiting module, a control end of the transistor, a first end of the transistor, a second end of the transistor, a first end of the first current limiting module, a second end of the second current limiting module, a control end of the transistor, a second end of the transistor, a first end of the voltage stabilizing module, a second end of the transistor, a second end of the voltage stabilizing module, a first end of the second current limiting module, a second end of the transistor, a first end of the voltage stabilizing module, a second end of the second current limiting module, a second end of the voltage stabilizing module, a control end of the transistor, a second end of the voltage stabilizing module, a first end of the second current limiting module, a second end of the transistor, a second end of the voltage stabilizing module, a first end of the voltage stabilizing module, a second end of the voltage stabilizing module, and a first end of the transistor.
According to any of the foregoing embodiments of the first aspect of the application, the switch module comprises silicon carbide transistors.
According to any one of the embodiments of the first aspect of the present application, the transformer module comprises a transformer, the secondary winding comprises a primary winding and a secondary winding, the primary winding of the transformer has a first end electrically connected to the input power supply terminal, the primary winding has a second end electrically connected to the second end of the switch module, the primary winding of the transformer has a first end electrically connected to the ground terminal, the primary winding has a second end electrically connected to the output power supply terminal, the secondary winding of the transformer has a first end grounded, and the secondary winding has a second end electrically connected to the fourth terminal of the linear voltage regulator sub-circuit.
According to any one of the embodiments of the first aspect of the present application, the flyback power supply circuit further includes a first reverse cutoff module, a first end of the first reverse cutoff module is electrically connected to the second end of the primary and secondary winding, a second end of the first reverse cutoff module is electrically connected to the output power supply end, and a first decoupling module, a first end of the first decoupling module is electrically connected to the second end of the first reverse cutoff module and the output power supply end, and a second end of the first decoupling module is electrically connected to the first end of the primary and secondary winding and the ground end.
According to any one of the embodiments of the first aspect of the present application, the flyback power supply circuit further includes a second reverse cutoff module, a first end of the second reverse cutoff module is electrically connected to the second end of the secondary winding, a second end of the second reverse cutoff module is electrically connected to the fourth end of the linear voltage stabilizing sub-circuit, a first end of the second decoupling module is electrically connected to the second end of the secondary winding and the fourth end of the linear voltage stabilizing sub-circuit, and a second end of the second decoupling module is electrically connected to the ground.
According to any one of the foregoing embodiments of the first aspect of the present application, the flyback power supply circuit further includes a spike suppression sub-circuit, a first end of the spike suppression sub-circuit is electrically connected to the input power supply end and the first end of the primary winding, a second end of the spike suppression sub-circuit is electrically connected to the second end of the primary winding and the second end of the switching module, and the spike suppression sub-circuit is configured to suppress a spike generated when the switching module is turned off.
According to any one of the embodiments of the first aspect of the present application, the spike suppression sub-circuit includes a third charge/discharge module, a first end of the third charge/discharge module being electrically connected to the input power supply end and the first end of the primary winding, a first voltage dividing module, a first end of the first voltage dividing module being electrically connected to the first end of the third charge/discharge module and the first end of the primary winding, a fourth reverse cut-off module, a first end of the fourth reverse cut-off module being electrically connected to the second end of the primary winding and the second end of the switch module, and a second end of the fourth reverse cut-off module being electrically connected to the second end of the third charge/discharge module and the second end of the first voltage dividing module.
According to any one of the previous embodiments of the first aspect of the present application, the input power supply terminal includes a positive voltage dc input terminal and a negative voltage dc input terminal, and the flyback power supply circuit further includes a fourth charge-discharge module, a first end of the fourth charge-discharge module is electrically connected to the positive voltage dc input terminal, and a second end of the fourth charge-discharge module is electrically connected to the negative voltage dc input terminal.
According to any one of the embodiments of the first aspect of the present application, the flyback power supply circuit further includes a first sampling module, a second voltage dividing module, and a second voltage dividing module, wherein the first end of the first sampling module is electrically connected with the input power supply end, the first end of the second sampling module is electrically connected with the second end of the first sampling module and the feedforward compensation end of the driving chip, the second end of the second sampling module is electrically connected with the ground end, the first end of the second voltage dividing module is electrically connected with the first end of the switch module, and the second end of the second voltage dividing module is electrically connected with the ground end.
According to the flyback power supply circuit provided by the embodiment of the application, the input power supply end supplies power to the linear voltage stabilizing sub-circuit, so that the linear voltage stabilizing sub-circuit stabilizes the input voltage in a specific interval, and the stabilized voltage is transmitted to the driving chip through the power supply input end of the driving chip, so that the driving chip can send a stabilized driving signal through the driving signal output end to control the on and off of the switch module. Because the potential of the power input end is in a stable section, the high level of the driving signal is also in a stable section, and the high level potential of the driving signal can be in a better section by changing the linear voltage stabilizing sub-circuit, so that the on-resistance of the switch module is maintained in the better section, the on-loss of the switch module is reduced, and the heating is reduced.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings that are needed to be used in the embodiments of the present application will be briefly described, and it is possible for a person skilled in the art to obtain other drawings according to these drawings without inventive effort.
FIG. 1 is a schematic diagram of a circuit connection of a flyback power supply circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a circuit connection of a linear voltage regulator sub-circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of another circuit connection of the flyback power supply circuit according to the embodiment of the present application;
Fig. 4 is a schematic diagram of still another circuit connection of the flyback power supply circuit according to the embodiment of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings and the detailed embodiments. It should be understood that the particular embodiments described herein are meant to be illustrative of the application only and not limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the application by showing examples of the application.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the term "and/or" as used herein is merely an association relationship describing the associated object, and means that there may be three relationships, e.g., a and/or B, and that there may be three cases where a exists alone, while a and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In embodiments of the present application, the term "electrically connected" may refer to two components being directly electrically connected, or may refer to two components being electrically connected via one or more other components.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Accordingly, it is intended that the present application covers the modifications and variations of this application provided they come within the scope of the appended claims (the claims) and their equivalents. The embodiments provided by the embodiments of the present application may be combined with each other without contradiction.
Before describing the technical solution provided by the embodiments of the present application, in order to facilitate understanding of the embodiments of the present application, the present application firstly specifically describes the problems existing in the related art:
Firstly, in the existing household energy storage series, in the process that the flyback power supply circuit supplies power to the driving chip at the power supply end, the power supply voltage cannot be always ensured to be stabilized in a specific section, and further, the voltage for the driving chip cannot be ensured to be in a stable section, and the high level of the driving chip when the driving chip sends out PWM waves cannot be ensured to be in a stable section, so that the on-resistance of a transistor receiving the PWM waves cannot be maintained in an optimal section, and the on-loss of the transistor is increased.
In the household energy storage series, the upper limit of the input power supply of the flyback power supply is 1100V due to three-phase alternating current power supply, and the maximum drain-source voltage value of the current common silicon Metal-Oxide-Semiconductor (Si-MOS) is only 1500V, and if the household energy storage series is applied to the input condition of the flyback power supply of 1100V, the voltage stress of a single Si-MOS can exceed the standard.
The solution in the related art is to use a dual-tube series flyback topology. However, the material cost is increased due to the need of two main power Si-MOS and the increase of driving electric appliances, and the design difficulty is increased due to the fact that the driving circuit needs two paths and is isolated due to the two main power tube Si-MOS, and the transformer needs two primary windings.
In order to solve the technical problems, an embodiment of the present application provides a flyback power supply circuit, which can solve the technical problems.
Fig. 1 is a schematic circuit diagram of a flyback power supply circuit according to an embodiment of the present application, and as shown in fig. 1, the flyback power supply circuit 100 may include a driver chip 110, a linear voltage stabilizing sub-circuit 120, a voltage transformation module 130 and a switch module 140.
The first end of the linear voltage regulator sub-circuit 120 is electrically connected to the input power supply terminal VIN, the second end of the linear voltage regulator sub-circuit 120 is electrically connected to the power input terminal VCC of the driving chip 110, the third end of the linear voltage regulator sub-circuit 120 is electrically connected to the ground terminal GND, and the linear voltage regulator sub-circuit 120 is used for maintaining the potential of the power input terminal VCC of the driving chip 110. How the particular linear regulator sub-circuit 120 stabilizes the power supply input VCC level is explained in detail in reference to fig. 2.
The driving chip 110 is configured to output a driving signal in response to a potential of a power input terminal VCC of the driving chip 110.
It should be noted that the driving chip 110 should be selected to have a linear relationship between the driving voltage of the driving signal and the potential of the power input terminal VCC. Thus, since the potential of the power supply input terminal VCC is stable (because of the linear voltage stabilizing sub-circuit), and the potential of the power supply output terminal VCC is a relatively constant value with respect to the high level of the driving signal, the driving signal outputted by the driving chip according to the potential of the power supply input terminal VCC is also stable in the high level stage.
The transformer module 130 includes a primary winding N P and a secondary winding N S, where a first end of the primary winding N P is electrically connected to the input power supply terminal VIN, and the secondary winding N S is electrically connected to the output power supply terminal VOUT.
The voltage transformation module 130 may be used to output a desired voltage from the voltage of the primary winding N p according to the turns ratio of the primary winding N p and the secondary winding N S.
The control end of the switch module 140 is electrically connected to the driving signal output end GD of the driving chip 110, the first end of the switch module 140 is electrically connected to the ground end GND, the second end of the switch module 140 is electrically connected to the second end of the primary winding N P, and the switch module 140 is configured to conduct the primary winding N P to the ground end GND in response to the enabling level of the driving signal output by the driving signal output end GD.
The switch module 140 includes, but is not limited to, an NMOS transistor Q2.
In some specific embodiments, the driving chip 110 includes but is not limited to L6565D, the switch module 140 includes but is not limited to a silicon carbide transistor (SiC-MOS), in which case, the maximum Drain-Source Voltage value (Vds) of the SiC-MOS may reach 1700V, which may meet the Voltage stress requirement of the single-tube flyback topology under the 1100V input condition, solve the problem of exceeding the Voltage stress easily caused by a single Si-MOS, and only use one switch module instead of dual-tube series connection, thereby reducing the design difficulty and reducing the material cost.
In the flyback power supply circuit 100 of the embodiment of the present application, the input power supply terminal VIN supplies power to the linear voltage stabilizing sub-circuit 120, so that the linear voltage stabilizing sub-circuit 120 stabilizes the input voltage in a specific interval, and transmits the stabilized voltage to the driving chip 110 through the power input terminal VCC of the driving chip 110, so that the driving chip 110 can send a stable driving signal through the driving signal output terminal GD to control the on and off of the switching module 140. Because the potential of the power input VCC is in a stable section, the high level of the driving signal is also in a stable section, and the high level potential of the driving signal can be in a preferred section by changing the linear voltage stabilizing sub-circuit 120, so that the on-resistance of the switch module is maintained in a preferred section, the on-loss of the switch module 140 is reduced, and the heat generation is reduced.
Fig. 2 is a schematic diagram of another circuit connection of a flyback power supply circuit according to an embodiment of the present application, as shown in fig. 2, in some embodiments, the linear voltage stabilizing sub-circuit 120 may include a first current limiting module 201, a first charge/discharge module 202, a voltage stabilizing module 203, a transistor 204, a second current limiting module 205, and a second charge/discharge module 206.
The first end of the first current limiting module 201 is electrically connected to the input power supply VIN. The first end of the first charge-discharge module 202 is electrically connected to the second end of the first current limiting module 201, and the second end of the first charge-discharge module 202 is electrically connected to the ground GND. The first end of the voltage stabilizing module 203 is electrically connected to the second end of the first charge/discharge module 202 and the ground GND.
In some specific embodiments, the first current limiting module 201 is specifically configured to limit current when the input power supply terminal VIN supplies high voltage, the first current limiting module 201 includes, but is not limited to, a first resistor R1, the first charge-discharge module 202 includes, but is not limited to, a first capacitor C1, the voltage stabilizing module 203 includes, but is not limited to, a voltage stabilizing diode ZD1, an anode of the voltage stabilizing diode ZD1 is electrically connected to the ground terminal GND, and a cathode of the voltage stabilizing diode ZD1 is electrically connected to the control terminal of the transistor 204.
The control terminal of the transistor 204 is electrically connected to the second terminal of the voltage stabilizing module 203, the first terminal of the transistor 204 is electrically connected to the first terminal of the first charge-discharge module 202, the second terminal of the transistor 204 is electrically connected to the power input terminal of the driver chip, and in some specific embodiments, the transistor 204 includes, but is not limited to, an NPN transistor Q1.
The first end of the second current limiting module 205 is electrically connected to the first end of the transistor 204 and the first end of the first charge-discharge module 202, and the second end of the second current limiting module 205 is electrically connected to the control end of the transistor 204 and the second end of the voltage stabilizing module 203. In some embodiments, the second current limiting module 205 includes, but is not limited to, a second resistor R2, and the second resistor R2 is used as a current limiting resistor in the linear voltage stabilizing sub-circuit 120.
The first end of the second charge-discharge module 206 is electrically connected to the second end of the transistor 204 and the power input end of the driving chip, the second end of the second charge-discharge module 206 is electrically connected to the first end of the voltage stabilizing module 203 and the ground end, and in some embodiments the second charge-discharge module 206 includes, but is not limited to, a second capacitor C2.
Fig. 2 illustrates the transistor 204 as an NPN transistor Q1, and the voltage stabilizing module 203 as a zener diode ZD 1. The selection of the model number ZD1 determines the voltage regulation value of the linear voltage regulator sub-circuit 120. Taking the zener diode ZD1 as a 20V regulator as an example, the NPN transistor Q1 is usually turned on at 0.5V in actual use, and the voltage at the power input terminal VCC is about 19.5V.
Fig. 3 is a schematic diagram of still another circuit connection of the flyback power supply circuit according to the embodiment of the present application, as shown in fig. 3, the transformer module 130 includes a transformer T1, the secondary winding N S includes a primary secondary winding N S1 and a secondary winding N S2, a first end of a primary winding N P of the transformer T1 is electrically connected to the input power supply terminal VIN, a second end of the primary winding N P is electrically connected to a second end of the switch module, a first end of a primary secondary winding N S1 of the transformer T1 is electrically connected to the ground terminal GND, a second end of the primary secondary winding N S1 is electrically connected to the output power supply terminal VOUT, a first end of a secondary winding N S2 of the transformer T1 is grounded, and a second end of the secondary winding N S2 is electrically connected to a fourth terminal of the linear voltage regulator circuit 120.
The secondary winding N S2 of the transformer T1 is used to supply power to the linear voltage stabilizing sub-circuit, and further to supply power to the driving chip 110.
When the circuit is started, the input power supply end supplies power to the linear voltage stabilizing sub-circuit 120, so that the voltage of the power supply input end VCC of the driving chip 110 can be stabilized in a specific section according to the circuit structure of the linear voltage stabilizing sub-circuit 120 in FIG. 2, and further, the driving chip 110 sends out a driving signal through the driving signal output end GD, and the high level stage of the driving signal is stabilized in a specific section. Illustratively, the drive voltage of the drive signal is approximately 16.5V when the voltage of VCC is regulated at 19.5V. The switch module 140 is turned on to directly drive the control transformer T1. When the transformer T1 starts to operate, the secondary winding N S2 of the transformer T1 supplies power to the linear voltage stabilizing sub-circuit, and further supplies power to the driving chip 110.
Fig. 3 shows that the first end of the primary winding N P is the same-name end, and the second end of the primary winding N S1 is the same-name end, and the second end of the secondary winding N S2 is the same-name end, in the case that the first end of the primary winding N P is the same-name end.
With continued reference to fig. 3, in some embodiments, the flyback power supply 100 may further include a first reverse cutoff module 301, a first decoupling module 302, a second reverse cutoff module 303, and a second decoupling module 304.
The first end of the first reverse cut-off module 301 is electrically connected to the second end of the primary and secondary winding N S1, and the second end of the first reverse cut-off module 301 is electrically connected to the output power supply end.
The first end of the first decoupling module 302 is electrically connected to the second end of the first reverse blocking module 301 and the output power supply terminal VOUT, and the second end of the first decoupling module 302 is electrically connected to the first end of the primary-secondary winding N S1 and the ground terminal GND.
The first end of the second reverse cut-off module 303 is electrically connected to the second end of the secondary winding N S2, and the second end of the second reverse cut-off module 303 is electrically connected to the fourth end of the linear regulator circuit 120.
The first end of the second decoupling module 304 is electrically connected to the second end of the secondary winding N S2 and the fourth end of the linear voltage regulator sub-circuit 120, and the second end of the second decoupling module 304 is electrically connected to the ground GND.
In some particular embodiments, the first reverse cut-off module 301 includes, but is not limited to, a first diode D1, the second reverse cut-off module 303 includes, but is not limited to, a second diode D2, the first decoupling module 302 includes, but is not limited to, a third capacitor C3, and the second decoupling module includes, but is not limited to, a fourth capacitor C4.
The first reverse blocking module 301 and the first decoupling module 302 are used for filtering interference, so that the output voltage of the primary winding N S1 and the secondary winding N S1 is more stable, the first reverse blocking module 301 is used for blocking the reverse voltage induced by the primary winding N S1, and the first decoupling module 302 performs noise reduction treatment.
The second reverse blocking module 303 and the second decoupling module 304 also function to filter out interference, so that the output voltage of the secondary winding N S2 is more stable. The interference filtering principle is the same as that of the first reverse blocking module 301 and the first decoupling module 302, and will not be described herein.
With continued reference to fig. 3, in some embodiments, the flyback power supply circuit 100 may also include a spike suppression subcircuit 310.
The first end of the spike suppression sub-circuit 310 is electrically connected to the input power supply end VIN and the first end of the primary winding N P, the second end of the spike suppression sub-circuit 310 is electrically connected to the second end of the primary winding N P and the second end of the switch module 140, and the spike suppression sub-circuit 310 is configured to suppress a spike generated when the switch module 140 is turned off.
In some embodiments, the spike suppression subcircuit 310 may include a third charge-discharge module 311, a first voltage division module 312, and a fourth reverse cutoff module 313.
The first end of the third charge/discharge module 311 is electrically connected to the input power supply terminal VIN and the first end of the primary winding N P. The first end of the first voltage dividing module 312 is electrically connected to the first end of the third charge/discharge module 311 and the first end of the primary winding N P.
The first end of the fourth reverse blocking module 313 is electrically connected to the second end of the primary winding N P and the second end of the switching module 140, and the second end of the fourth reverse blocking module 313 is electrically connected to the second end of the third charge/discharge module 311 and the second end of the first voltage dividing module 312.
In some specific embodiments, the third charge-discharge module 311 includes, but is not limited to, a fifth capacitor C5, the first voltage dividing module 312 includes, but is not limited to, a third resistor R3, and the fourth reverse cut-off module 313 includes, but is not limited to, a third diode D3.
Fig. 4 is a schematic circuit connection diagram of a flyback power supply circuit according to an embodiment of the present application, where, as shown in fig. 4, an input power supply terminal VIN includes a positive voltage DC input terminal dc+ and a negative voltage DC input terminal DC-, and the flyback power supply circuit 100 may further include a fourth charge-discharge module 401.
The first end of the fourth charge-discharge module 401 is electrically connected to the positive voltage DC input DC +, and the second end of the fourth charge-discharge module 401 is electrically connected to the negative voltage DC input DC.
In some specific embodiments, the fourth charge-discharge module 401 includes, but is not limited to, a sixth capacitor C6.
With continued reference to fig. 4, the flyback power supply circuit 100 may further include a first sampling module 402, a second sampling module 403, and a second voltage dividing module 404.
A first end of the first sampling module 402 is electrically connected to the input power supply VIN.
The first end of the second sampling module 403 is electrically connected to the second end of the first sampling module 402 and the feedforward compensation end VFF of the driving chip, and the second end of the second sampling module 403 is electrically connected to the ground end GND.
The first sampling module 402 and the second sampling module 403 function to sample the current in the branch, providing feedforward compensation for the chip.
The first end of the second voltage dividing module 404 is electrically connected to the first end of the switch module 140, and the second end of the second voltage dividing module 404 is electrically connected to the ground GND.
In some specific embodiments, the first sampling module 402 may include a fourth resistor R4, the second sampling module 403 may include a fifth resistor R5, and the second voltage dividing module 404 includes a sixth resistor R6.
Illustratively, in terms of device selection implementation, the switching module 140 may be a SiC-MOS and the driver chip may be an L6565D chip. In order to ensure that the SiC-MOS has a relatively low drain-to-source on-state resistance (Rds) in the on state, the driving voltage VOH (the driving voltage VOH is the high level voltage output by the driving signal output terminal GD of the driving chip 110) must be controlled within a narrow range. The SiC-MOS can select IV2Q171R0T3 of the core electron, and the recommended driving voltage VOH is 15V-18V.
Since the driving voltage VOH of the L6565D chip is related to the voltage of the power input terminal VCC of the chip, which is a relatively constant value, the linear voltage stabilizing sub-circuit 120 is used to stabilize the value of the power input terminal VCC of the chip in a specific interval, and further, the VOH can be stabilized in a specific interval. When the voltage stabilizing module 203 selects the voltage stabilizing value of the first zener diode ZD1 to be 20V, the power is supplied through the first resistor R1 when the power is turned on, the linear voltage stabilizing sub-circuit 120 stabilizes VCC at about 19.5V, and when vcc=19.5v, the driving voltage VOH is about 16.5, so that the driving voltage can directly drive the SiC-MOS (the switch module 140). Thereby realizing the design of a single-tube flyback SiC-MOS driving circuit.
It should be understood that the specific structures of the circuits provided in the drawings of the embodiments of the present application are only examples and are not intended to limit the present application. In addition, the above embodiments provided by the present application may be combined with each other without contradiction.
It should be understood that, in the present specification, each embodiment is described in an incremental manner, and the same or similar parts between the embodiments are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. These embodiments are not exhaustive of all details, nor are they intended to limit the application to the precise embodiments disclosed, in accordance with the application. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the application and the practical application, to thereby enable others skilled in the art to best utilize the application and various modifications as are suited to the particular use contemplated. The application is limited only by the claims and the full scope and equivalents thereof.
Those skilled in the art will appreciate that the above-described embodiments are exemplary and not limiting. The different technical features presented in the different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in view of the drawings, the description, and the claims. In the claims, the term "comprising" does not exclude other structures, the terms "a" and "an" do not exclude a plurality, and the terms "first" and "second" are used to indicate a name and not to denote any particular order. Any reference signs in the claims shall not be construed as limiting the scope. The presence of certain features in different dependent claims does not imply that these features cannot be combined to advantage.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420766344.2U CN222192126U (en) | 2024-04-15 | 2024-04-15 | Flyback power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420766344.2U CN222192126U (en) | 2024-04-15 | 2024-04-15 | Flyback power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222192126U true CN222192126U (en) | 2024-12-17 |
Family
ID=93831824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420766344.2U Active CN222192126U (en) | 2024-04-15 | 2024-04-15 | Flyback power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222192126U (en) |
-
2024
- 2024-04-15 CN CN202420766344.2U patent/CN222192126U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104753319B (en) | Method for driving switch | |
| US20200266720A1 (en) | Auxiliary Power Supply Apparatus and Method for Isolated Power Converters | |
| EP0998017B1 (en) | Switching power supply unit with active clamp circuit | |
| JP2007043886A (en) | Insulated gate driver circuit for power switching device | |
| EP4113835B1 (en) | Transformer based gate drive circuit | |
| CN102480216B (en) | System and method for driving acascode switch | |
| JP3237633B2 (en) | Switching power supply | |
| CN111010040B (en) | Synchronous rectification control device, insulated synchronous rectification type DC/DC converter, gate drive device, and AC/DC converter | |
| WO2012003685A1 (en) | Circuit for improving voltage-resistance of devices | |
| CN222192126U (en) | Flyback power supply circuit | |
| JP2020025158A (en) | High breakdown voltage integrated circuit | |
| CN112311227B (en) | Switch power supply and ringing elimination circuit and ringing elimination method thereof | |
| JPH10210736A (en) | Step-down type dc-dc converter | |
| US11171567B1 (en) | Power supply device for eliminating ringing effect | |
| WO2021057450A1 (en) | Switching converter and low voltage startup circuit thereof | |
| KR102077825B1 (en) | Boost converter | |
| JP6487743B2 (en) | Switching power supply | |
| CN112564458B (en) | Isolation driving circuit | |
| CN118842327B (en) | A switching power supply boost circuit | |
| JP2004519190A (en) | Switching power supply | |
| CN216699813U (en) | Drive circuit and switching power supply | |
| CN220492852U (en) | Driving circuit and switching power supply | |
| CN214256112U (en) | Rectifying device and power supply | |
| US20230318465A1 (en) | Pulse width modulator for a stacked half bridge | |
| WO2019056830A1 (en) | Current sampling circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |