CN209860802U - Resonant flyback power circuit, device and electronic equipment - Google Patents
Resonant flyback power circuit, device and electronic equipment Download PDFInfo
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- CN209860802U CN209860802U CN201920922831.2U CN201920922831U CN209860802U CN 209860802 U CN209860802 U CN 209860802U CN 201920922831 U CN201920922831 U CN 201920922831U CN 209860802 U CN209860802 U CN 209860802U
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Abstract
The utility model discloses a resonant flyback power supply circuit, device and electronic equipment. Through increasing resonance drive circuit, the electric charge in the secondary circuit is balanced before switch circuit switches on for the influence of damping oscillation is avoided receiving to the secondary circuit, avoids appearing the more and more high condition of valley voltage, reduces and opens the loss. The utility model discloses technical scheme has solved the influence that exists because secondary circuit receives the damping oscillation among the prior art, and the valley bottom voltage that the valley bottom detection end detected is more and more high, leads to the corresponding rising of switch circuit's conducting voltage, and then opens the technical problem that the loss rises, has reached and has reduced resonant mode and has turned over the technological effect that power supply circuit switched on the loss, has promoted user experience.
Description
Technical Field
The utility model relates to a power technical field, in particular to resonant mode flyback power supply circuit, device and electronic equipment.
Background
In the working process of the traditional resonant flyback power supply circuit, the secondary circuit has the problem of damping oscillation, so that the conduction voltage of the primary circuit is gradually increased, further the loss of the switching tube in the turn-off process is increased, and the traditional resonant flyback power supply circuit has the problem of low working efficiency due to the loss of the switching tube in the turn-on process.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a resonant mode flyback power supply circuit aims at solving the problem that the damping that traditional resonant mode flyback power supply circuit secondary circuit exists vibrates, improves resonant mode flyback power supply circuit's work efficiency.
In order to achieve the above object, the resonant flyback power circuit provided by the present invention comprises a primary circuit, a secondary circuit, a switching circuit, a resonant driving circuit, and a valley bottom detection circuit; the switching circuit is connected with the primary circuit, the primary circuit is connected with the secondary circuit, and the secondary circuit is connected with the resonance driving circuit; the valley bottom detection circuit is connected with the secondary circuit; wherein,
the switch circuit is used for controlling the on-off between the primary circuit and the ground;
the primary circuit is used for generating a primary waveform voltage according to the control of the switching circuit and sending the primary waveform voltage to the secondary circuit;
the secondary circuit is used for receiving the primary waveform voltage sent by the primary circuit and converting the primary waveform voltage into a secondary waveform voltage;
the resonance driving circuit is used for balancing charges in the secondary circuit before the switch circuit is conducted;
and the valley bottom detection circuit is used for receiving the secondary waveform voltage, converting the secondary waveform voltage into resonance waveform voltage and detecting the lowest voltage point in the preset time of the resonance waveform voltage.
Preferably, the valley bottom detection circuit further includes a first resistor, a second resistor, and a first excitation inductor.
The first end of the first excitation inductor is connected with the equal potential, the second end of the excitation inductor is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor and the valley bottom detection end, and the second end of the second resistor is connected with the equal potential.
Preferably, the secondary circuit comprises a first diode, a first capacitor and a second excitation inductor; wherein,
the first end of the second excitation inductor is grounded, the second end of the second excitation inductor is connected with the input end of the first diode, the output end of the first diode is connected with the first end of the first capacitor, and the second end of the first capacitor is grounded; the second excitation inductor is connected in parallel with the resonant driving circuit.
Preferably, the primary circuit includes a third resistor, a second diode, a second capacitor, and a third exciting inductor.
The first end of the second capacitor is connected with a starting voltage end, the first end of the second capacitor is also connected with the first end of the third excitation inductor, the second end of the third excitation inductor is connected with the input end of the second diode, and the output end of the second diode is connected with the second end of the second capacitor; the first end of the third resistor is connected with the first end of the second capacitor, and the second end of the third resistor is connected with the second end of the second capacitor; the second diode input end is also connected with the switch circuit.
Preferably, the switch circuit includes a fourth resistor, a fifth resistor, and a first MOS transistor.
The first end of the fourth resistor is connected with the driving end, the second end of the fourth resistor is connected with the grid electrode of the first MOS transistor, the source electrode of the first MOS transistor is connected with the primary circuit, the second end of the fourth resistor is further connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the equal potential, and the second end of the fifth resistor is further connected with the drain electrode of the first MOS transistor.
Preferably, the resonant driving circuit further includes a second MOS transistor and a third capacitor.
The source electrode of the second MOS transistor is connected with the grounding end of the secondary circuit, the grid electrode of the second MOS transistor is connected with the resonance driving end, the drain electrode of the second MOS transistor is connected with the first end of the third capacitor, and the second end of the third capacitor is connected with the output end of the secondary circuit.
Preferably, the resonant driving circuit further includes a third MOS transistor and a fourth capacitor.
The first end of the fourth capacitor is connected with the grounding end of the secondary circuit, the second end of the fourth capacitor is connected with the source electrode of the third MOS tube, the drain electrode of the third MOS tube is connected with the output end of the secondary circuit, and the grid electrode of the third MOS tube is connected with the end of the resonance driving circuit.
Preferably, the resonance driving circuit further includes an optical coupler chip and a fifth capacitor.
The first end of the fifth capacitor is connected with the grounding end of the secondary circuit, the second end of the fifth capacitor is connected with the controlled input end of the optical coupling chip, the controlled output end of the optical coupling chip is connected with the output end of the secondary circuit, the input end of the optical coupling chip is connected with the resonance driving end, and the output end of the optical coupling chip is connected with the equal potential.
The utility model also provides a resonant mode flyback power supply unit, resonant mode flyback power supply unit includes as above resonant mode flyback power supply circuit.
The utility model also provides an electronic equipment, electronic equipment includes as above resonant mode flyback power supply unit.
The utility model discloses technical scheme forms a resonant mode flyback power supply circuit through adopting elementary circuit, secondary circuit, switch circuit and resonance drive circuit. The resonance driving circuit balances charges in the secondary circuit before the switching circuit is switched on, so that the secondary circuit is free from the influence of damping oscillation, the situation that the valley bottom voltage is higher and higher is avoided, and the switching-on loss is reduced; the utility model discloses technical scheme can solve the condition that secondary circuit exists damping oscillation in traditional resonant mode flyback circuit, through the mode of the electric charge in the balanced secondary circuit, reduces the bottom of a valley voltage that the bottom of a valley detection end detected, reduces and opens the loss, has reduced the power consumption.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional block diagram of an embodiment of a resonant flyback power supply circuit of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the resonant flyback power supply circuit of the present invention;
fig. 3 is a schematic circuit diagram of another embodiment of the resonant flyback power supply circuit of the present invention;
fig. 4 is a schematic circuit diagram of another embodiment of the resonant flyback power supply circuit of the present invention;
fig. 5 is a schematic circuit diagram of another embodiment of the resonant flyback power supply circuit of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Primary circuit | R1～R5 | First to fifth resistors |
| 200 | Switching circuit | C1～C5 | First to fifth capacitors |
| 300 | Secondary circuit | Q1～Q4 | First to fourth MOS transistors |
| 400 | Resonant drive circuit | D1、D2 | First diode and second diode |
| 500 | Valley bottom detection circuit | Np | Third excitation inductance |
| Ns | Second excitation inductance | Naux | First excitation inductance |
| HV | Starting voltage terminal | U1 | Optical coupling chip |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a resonant flyback power circuit, which includes a primary circuit 100, a secondary circuit 300, a switch circuit 200, a resonant driving circuit 400 and a valley bottom detection circuit 500; the switching circuit 200 is connected to the primary circuit 100, the primary circuit 100 is connected to the secondary circuit 300, and the secondary circuit 300 is connected to the resonant driving circuit 400; the valley bottom detection circuit 500 is connected to the secondary circuit 300; wherein,
the switch circuit 200 is used for controlling the on-off between the primary circuit 100 and the ground;
the primary circuit 100 is configured to generate a primary waveform voltage according to control of the switching circuit 200 and transmit the primary waveform voltage to the secondary circuit 300;
the secondary circuit 300 is configured to receive the primary waveform voltage sent by the primary circuit 100 and convert the primary waveform voltage into a secondary waveform voltage;
the resonant driving circuit 400 is used for balancing the charges in the secondary circuit 300 before the switching circuit 200 is turned on;
the valley bottom detection circuit 500 is configured to receive the secondary waveform voltage, convert the secondary waveform voltage into a resonant waveform voltage, and detect a lowest voltage point within a preset time of the resonant waveform voltage.
It should be noted that, the resonant flyback power supply circuit generally includes the primary circuit 100, the secondary circuit 300 and the switch circuit 200, and the current in the primary circuit 100 flows or stops through the on/off of the switch circuit 200, and the current in the secondary circuit 300 flows or stops correspondingly, because of the principle of transmission and use of the primary and secondary circuits 300, the current still flows in the secondary circuit 300 when the primary circuit 100 is turned off, and because the switch circuit 200 is rapidly turned off and turned on, the current still flows in the secondary circuit 300 when the primary circuit 100 is turned on again, and this current may affect the working efficiency of the resonant flyback power supply circuit, that is, the power conversion rate.
It is worth emphasizing that, in the present embodiment, the resonant driving circuit 400 is added, there is a connection between the resonant driving circuit 400 and the switching circuit 200, before the switching circuit 200 is turned on, the resonant driving circuit 400 is turned on first, the flowing charges in the secondary circuit 300 enter the resonant driving circuit 400, at this time, the resonant driving circuit 400 is turned off again, the switching circuit 200 is turned on again, no current flows in the secondary circuit 300, and the working efficiency of the resonant flyback power supply circuit is improved.
It is easy to understand that it is not economical that no current flows in the secondary circuit 300 before the switch circuit 200 is turned on, and it is only necessary to reduce the interference current in the secondary circuit 300 according to the actual requirement to make it meet the use situation, so that there are many different design schemes for the resonant driving circuit 400 and the application in different scenarios is possible.
It should be noted that, the on-voltage of the resonant flyback power circuit conducted at the valley bottom of the voltage curve in the preset stage time is lower, and the power consumption in the conducting process is less, so that the valley bottom of the voltage curve in the preset stage time is detected by the valley bottom detection circuit 500, and the resonant flyback power circuit is conducted at the valley bottom, so that the switching power consumption can be effectively reduced, and the power conversion rate is improved.
In this embodiment, the resonant driving circuit 400 balances charges in the secondary circuit 300 before the switching circuit 200 is turned on, so that the secondary circuit 300 is not affected by the damped oscillation, the turn-on loss is reduced, the switching power consumption of the resonant flyback power supply circuit is reduced, and the power conversion rate is improved.
As shown in fig. 2, the valley detection circuit 500 further includes a first resistor R1, a second resistor R2, and a first excitation inductor Naux.
The first end of the first excitation inductor Naux is connected with the equal potential, the second end of the excitation inductor is connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the first end of the second resistor R2 and the valley bottom detection end, and the second end of the second resistor R2 is connected with the equal potential.
It should be noted that the first excitation inductor Naux receives the secondary waveform voltage sent by the secondary circuit 300 and converts the secondary waveform voltage into a resonant waveform voltage, and detects a voltage curve of the resonant waveform voltage in a preset period time through the valley bottom detection end to obtain a valley bottom voltage thereof, and the first resistor R1 and the second resistor R2 divide the voltage of the voltage curve so that the voltage range of the valley bottom detection end is within the voltage range that can be detected by the valley bottom detection end.
Specifically, the secondary circuit includes a first diode D1, a first capacitor C1, and a second excitation inductor Ns.
A first end of the second excitation inductor Ns is grounded, a second end of the second excitation inductor Ns is connected with an input end of the first diode D1, an output end of the first diode D1 is connected with a first end of the first capacitor C1, and a second end of the first capacitor C1 is grounded; the second excitation inductance Ns is connected in parallel with the resonant drive circuit.
It should be emphasized that the valley detection circuit 500 is connected to the second excitation inductor Ns in the secondary circuit 300 through the first excitation inductor Naux, the current is generated from the second excitation inductor Ns, a loop is formed with a ground terminal from a first end of the second excitation inductor Ns, and the first diode D1 and the first capacitor C1 process the reverse current.
In this embodiment, the valley bottom detection circuit 500 is added, so that the circuit design of the resonant flyback power supply circuit is improved, the lowest voltage in the preset time period is detected, and when the lowest voltage is detected, the resonant flyback power supply circuit is turned on, the switching power consumption of the resonant flyback power supply circuit is further reduced, and the power conversion rate is further improved.
Referring to fig. 2, the primary circuit 100 includes a third resistor R3, a second diode D2, a second capacitor C2, and a third magnetizing inductor Np; wherein,
a first end of the second capacitor C2 is connected to the starting voltage terminal HV, a first end of the second capacitor C2 is further connected to a first end of the third excitation inductor Np, a second end of the third excitation inductor Np is connected to an input end of the second diode D2, and an output end of the second diode D2 is connected to a second end of the second capacitor C2; a first end of the third resistor R3 is connected with a first end of the second capacitor C2, and a second end of the third resistor R3 is connected with a second end of the second capacitor C2; the input terminal of the second diode D2 is also connected to the switching circuit 200.
It is easy to understand that, in this embodiment, the design of the primary circuit 100 adopts the design of a conventional resonant flyback power supply circuit, the starting voltage terminal HV is directly connected to one end of the third excitation inductor Np, the other end of the third excitation inductor Np is connected to the switch circuit 200, and forms a loop with the switch circuit 200, and is controlled by the switch circuit 200, when a voltage is applied to the starting voltage terminal HV and enters the primary circuit 100, the second capacitor C2 is charged, the circuit is turned off, when no current flows to the starting voltage terminal HV, the second diode D2 isolates the charge in the second capacitor C2 to prevent a reverse current, and the charge in the second capacitor C2 is released from the third resistor R3.
Specifically, the switch circuit 200 includes a fourth resistor R4, a fifth resistor R5, and a first MOS transistor Q1; wherein,
the first end of the fourth resistor R4 is connected to the driving end, the second end of the fourth resistor R4 is connected to the gate of the first MOS transistor Q1, the source of the first MOS transistor Q1 is connected to the primary circuit 100, the second end of the fourth resistor R4 is further connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is connected to the same potential, and the second end of the fifth resistor R5 is further connected to the drain of the first MOS transistor Q1.
It should be noted that the switch circuit 200 controls the primary circuit 100 to be turned on or off to the ground through the driving end, the fourth resistor R4, the fifth resistor R5 and the first MOS transistor Q1, wherein the fourth resistor R4 and the fifth resistor R5 control the voltages of the gate and the drain of the first MOS transistor Q1, so that the first MOS transistor Q1 is turned on when the driving end has a voltage signal.
In this embodiment, the primary circuit 100 and the switch circuit 200 both adopt a conventional design, have simple functions and strong reliability, and sufficiently reflect the application conditions of other circuits in the resonant flyback power supply circuit of the same type.
Referring to fig. 2, the resonant driving circuit 400 further includes a second MOS transistor Q2 and a third capacitor C3.
The source of the second MOS transistor Q2 is connected to the ground terminal of the secondary circuit 300, the gate of the second MOS transistor Q2 is connected to the resonant driving terminal, the drain of the second MOS transistor Q2 is connected to the first terminal of the third capacitor C3, and the second terminal of the third capacitor C3 is connected to the output terminal of the secondary circuit 300.
It is worth emphasizing that there are various design schemes for the resonant driving circuit 400, and fig. 2 is a scheme in this embodiment, in which the second MOS transistor Q2 is matched with the third capacitor C3, the second MOS transistor Q2 controls the connection between the resonant driving circuit 400 and the secondary circuit 300, the third capacitor C3 balances charges in the secondary circuit 300, and the resonant driving terminal provides a bias for the second MOS transistor Q2, wherein the first resonant driving terminal turns on the second MOS transistor Q2 before the switching circuit 200 turns on.
Referring to fig. 3, the resonant driving circuit 400 further includes a third MOS transistor Q3 and a fourth capacitor C4.
The first end of the fourth capacitor C4 is connected to the ground terminal of the secondary circuit 300, the second end of the fourth capacitor C4 is connected to the source of the third MOS transistor Q3, the drain of the third MOS transistor Q3 is connected to the output terminal of the secondary circuit 300, and the gate of the third MOS transistor Q3 is connected to the resonant driving circuit 400.
It is easy to understand that the present circuit is designed as another design scheme of the resonant driving circuit 400, which is the same as the design principle of fig. 2, the third MOS transistor Q3 controls the connection between the resonant driving circuit 400 and the secondary circuit 300, the resonant driving terminal provides bias for the third MOS transistor Q3, the fourth capacitor C4 balances the charge in the secondary circuit 300, and the resonant driving terminal has the same property as that of fig. 2.
Referring to fig. 4, the resonant driving circuit 400 further includes an optocoupler chip U1 and a fifth capacitor C5.
The first end of the fifth capacitor C5 is connected with the grounding end of the secondary circuit 300, the second end of the fifth capacitor C5 is connected with the controlled input end of the optocoupler chip U1, the controlled output end of the optocoupler chip U1 is connected with the output end of the secondary circuit 300, the input end of the optocoupler chip U1 is connected with the resonance driving end, and the output end of the optocoupler chip U1 is connected with the equal potential.
It should be noted that, compared with the technical scheme in fig. 3, in the circuit design, the optical coupler chip U1 replaces the third MOS transistor Q3, and the fifth capacitor C5 replaces the fourth capacitor C4, so that all technical characteristics of the optical coupler chip U1 are provided in response speed and response conditions, and a use scene is smaller than the technical scheme in fig. 3, but a special scene has a stronger advantage.
It is emphasized that, according to the principle of the above circuit design, the minimum circuit of the resonant driving circuit 400 can be formed by connecting a controllable switch, a control terminal and a storage element in series, and the order of exchanging the connection between the controllable switch and the storage element does not affect the function of the resonant driving circuit 400.
In the technical scheme of the embodiment, the resonant driving circuit 400 under a common condition is introduced, the design idea of the circuit is disclosed, the circuit design of the resonant flyback power circuit is further improved, a more effective design scheme is provided for part of scenes, and the application range of the technical scheme is expanded.
Referring to fig. 5, in the present embodiment, the secondary circuit 300 and the resonant driving circuit 400 may be designed together, and the circuits after the common design simplify part of the electronic components in fig. 2 to 4, thereby reducing the cost.
It is easy to understand that, in the present embodiment, by using the first capacitor C1 in the secondary circuit 300, using the capacitor to balance the charges in the secondary circuit 300, and turning on or off the first capacitor C1 by the fourth MOS transistor Q4, in order to implement the above function, the power supply is added at the second end of the first capacitor C1.
This embodiment is through improving secondary circuit 300, has improved the utility model discloses technical scheme improves resonant mode flyback power supply circuit's work efficiency and provides another kind of design for solving the problem of the damping vibration that traditional resonant mode flyback power supply circuit 300 exists.
The utility model also provides a resonant flyback power supply device, this resonant flyback power supply device include as above resonant flyback power supply circuit, this resonant flyback power supply circuit's concrete structure refers to above-mentioned embodiment, because this current detection device has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and it is here no longer repeated one by one.
The utility model discloses still provide an electronic product, this electronic product include as above resonant mode flyback power supply unit, this resonant mode flyback power supply unit's concrete structure refers to above-mentioned embodiment, because this electronic product has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A resonant flyback power circuit is characterized in that the resonant flyback power circuit comprises a primary circuit, a secondary circuit, a switch circuit, a resonant drive circuit and a valley bottom detection circuit; the switching circuit is connected with the primary circuit, the primary circuit is connected with the secondary circuit, and the secondary circuit is connected with the resonance driving circuit; the valley bottom detection circuit is connected with the secondary circuit; wherein,
the switch circuit is used for controlling the on-off between the primary circuit and the ground;
the primary circuit is used for generating a primary waveform voltage according to the control of the switching circuit and sending the primary waveform voltage to the secondary circuit;
the secondary circuit is used for receiving the primary waveform voltage sent by the primary circuit and converting the primary waveform voltage into a secondary waveform voltage;
the resonance driving circuit is used for balancing charges in the secondary circuit before the switch circuit is conducted;
and the valley bottom detection circuit is used for receiving the secondary waveform voltage, converting the secondary waveform voltage into resonance waveform voltage and detecting the lowest voltage point in the preset time of the resonance waveform voltage.
2. A resonant flyback power supply circuit as in claim 1, wherein the valley detection circuit further comprises a first resistor, a second resistor, and a first excitation inductor; wherein,
the first end of the first excitation inductor is connected with the equal potential, the second end of the excitation inductor is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor and the valley bottom detection end, and the second end of the second resistor is connected with the equal potential.
3. A resonant flyback power supply circuit as in claim 1, wherein the secondary circuit comprises a first diode, a first capacitor, and a second excitation inductor; wherein,
the first end of the second excitation inductor is grounded, the second end of the second excitation inductor is connected with the input end of the first diode, the output end of the first diode is connected with the first end of the first capacitor, and the second end of the first capacitor is grounded; the second excitation inductor is connected in parallel with the resonant driving circuit.
4. A resonant flyback power supply circuit as in claim 1, wherein the primary circuit comprises a third resistor, a second diode, a second capacitor, and a third excitation inductor; wherein,
the first end of the second capacitor is connected with a starting voltage end, the first end of the second capacitor is also connected with the first end of the third excitation inductor, the second end of the third excitation inductor is connected with the input end of the second diode, and the output end of the second diode is connected with the second end of the second capacitor; the first end of the third resistor is connected with the first end of the second capacitor, and the second end of the third resistor is connected with the second end of the second capacitor; the second diode input end is also connected with the switch circuit.
5. A resonant flyback power supply circuit as in claim 1, wherein the switching circuit comprises a fourth resistor, a fifth resistor, and a first MOS transistor; wherein,
the first end of the fourth resistor is connected with the driving end, the second end of the fourth resistor is connected with the grid electrode of the first MOS transistor, the source electrode of the first MOS transistor is connected with the primary circuit, the second end of the fourth resistor is further connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the equal potential, and the second end of the fifth resistor is further connected with the drain electrode of the first MOS transistor.
6. A resonant flyback power supply circuit as in claim 1, wherein the resonant driving circuit further comprises a second MOS transistor and a third capacitor; wherein,
the source electrode of the second MOS transistor is connected with the grounding end of the secondary circuit, the grid electrode of the second MOS transistor is connected with the resonance driving end, the drain electrode of the second MOS transistor is connected with the first end of the third capacitor, and the second end of the third capacitor is connected with the output end of the secondary circuit.
7. A resonant flyback power supply circuit as in claim 1, wherein the resonant driving circuit further comprises a third MOS transistor and a fourth capacitor; wherein,
the first end of the fourth capacitor is connected with the grounding end of the secondary circuit, the second end of the fourth capacitor is connected with the source electrode of the third MOS tube, the drain electrode of the third MOS tube is connected with the output end of the secondary circuit, and the grid electrode of the third MOS tube is connected with the end of the resonance driving circuit.
8. A resonant flyback power supply circuit as in claim 1, wherein the resonant driving circuit further comprises an optocoupler chip and a fifth capacitor; wherein,
the first end of the fifth capacitor is connected with the grounding end of the secondary circuit, the second end of the fifth capacitor is connected with the controlled input end of the optical coupling chip, the controlled output end of the optical coupling chip is connected with the output end of the secondary circuit, the input end of the optical coupling chip is connected with the resonance driving end, and the output end of the optical coupling chip is connected with the equal potential.
9. A resonant flyback power supply device, characterized in that it comprises a resonant flyback power supply circuit according to any of claims 1 to 8.
10. An electronic device characterized in that the electronic device comprises the resonant flyback power supply device as claimed in claim 9.
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| CN201920922831.2U CN209860802U (en) | 2019-06-18 | 2019-06-18 | Resonant flyback power circuit, device and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114200214A (en) * | 2021-12-10 | 2022-03-18 | 福州大学 | High-frequency inductance loss measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200214A (en) * | 2021-12-10 | 2022-03-18 | 福州大学 | High-frequency inductance loss measuring method |
| CN114200214B (en) * | 2021-12-10 | 2024-06-04 | 福州大学 | High-frequency inductance loss measurement method |
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