CN208849675U - Electric power converter - Google Patents
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- CN208849675U CN208849675U CN201821538582.9U CN201821538582U CN208849675U CN 208849675 U CN208849675 U CN 208849675U CN 201821538582 U CN201821538582 U CN 201821538582U CN 208849675 U CN208849675 U CN 208849675U
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Abstract
Electric power converter provided by the embodiments of the present application, electric power converter include: controller, transformer, first switch, first capacitor device and secondary side diode；One end of first switch and one end of main sideline circle of transformer and the input terminal of controller connect, and the other end of the other end ground connection of first switch, the main sideline circle of transformer is connect with supply voltage；First capacitor device is in parallel with first switch；One end of secondary side diode and the secondary coil of transformer connect, and the other end and load connect.The periodic turn-on and turn-off of first switch, by selecting suitable first capacitor, it can make during first switch turns off, the leakage inductance and first capacitor resonance time of transformer are no more than a harmonic period, can achieve the purpose for reducing the energy loss in leakage inductance in this way.The suitable first capacitor, while leakage inductance and the valley of the voltage fluctuation of one end of first switch caused by first capacitor resonance being allowed to be less than first threshold voltage.
Description
Technical field
This application involves electrical component fields, in particular to a kind of electric power converter.
Background technique
In Medical Devices, communication network, electric car and robot, there are a large amount of signal isolators and isolated electricity
Force transducer, to protect the safety of user and equipment.At least one transformer is usually contained in isolated electric power converter.
The transformer for being k for a coefficient of coup, the energy being stored on the transformer leakage inductance and entire transformer
The ratio between energy is (1-k2):1.In current some applications, the transformer used has the lower coefficient of coup, such as wireless power
The miniature transformer in coupling coil and integrated isolated power supply in transmission.The coefficient of coup of these transformers is often below 0.8,
If not being subject to specially treated, the energy lost in leakage inductance will be greater than 36%, seriously reduce the efficiency of isolated electric power converter.
There are many types, such as positive activation type converter, flyback converter, push-pull type to convert for isolated electric power converter
Device is illustrated problems of the prior art below by taking flyback converter as an example.
A referring to Figure 1, Fig. 1 a show electric power converter in the prior art, the main side of switching tube Q1 and transformer X1
Coil L11 connection, the secondary coil L22 of transformer X1 are connect with diode DS1.VDD1 is input voltage, and VO1 is output electricity
Pressure, VG1 is the grid voltage of Q1, and VD1 is Q1 drain voltage, and iL11 is the electric current for flowing through L11, and iDs1 flows through diode
Electric current.The equivalent circuit diagram of X1 can indicate that Lm1 is the magnetization electricity of the main sideline circle of transformer X1 in Fig. 1 b dotted line frame
Sense, Lk1 is the leakage inductance of transformer X1, and equivalent main sideline circle Lp1 and equivalent secondary coil Ls1 constitutes an ideal transformer.Cd1
It is the drain parasitic capacitance of switching tube Q1.
The working principle of flyback converter is as shown in Figure 2.The flyback converter duty cycle is divided into four-stage, and first
The drain voltage VD1 of stage t1 to t2, switching tube Q1 conducting, diode Ds1 shutdown, Q1 is equal to 0, the main sideline of transformer X1
L11 electric current is enclosed to increase.Second stage t2 to t3, Q1 shutdown, the rising of VD1 voltage cause Ds1 to be connected, and leakage inductance Lk1 and Cd1 is humorous thereafter
Many a periods shake until the energy being stored on leakage inductance Lk1 dissipates completely.Phase III t3 to t4, Q1 shutdown, Ds1 conducting,
There is no electric current in leakage inductance, the electric current decline of Ds1 is until Ds1 electric current is 0.Fourth stage t4 to t5, Q1 shutdown, Ds1 shutdown are main
Sideline circle L11 and Cd1 resonance is until Q1 is connected again.
When due to second stage t2 to t3, the energy being stored on leakage inductance Lk1 will dissipate completely, cause the big of energy
Amount waste.
Fig. 3 shows a kind of existing flyback converter with buffer in the prior art.Buffer is by capacitor
Cp1, resistance Rp1, diode Dp1 composition.The prior art can alleviate in Fig. 2 t2 to the height of t3 stage leakage inductance and parasitic capacitance
Frequency resonance.When VD1 is greater than VDD1, diode Dp1 conducting, capacitor Cp1 absorbs energy and is dissipated by Rp1.The existing skill
One advantage of art is the due to voltage spikes that can reduce VD1, so as to use the lower switching tube of bearing capacity.The existing skill
Another advantage of art is can to reduce leakage inductance and parasitic capacitance high-frequency resonant bring to the electromagnetic interference of neighbouring circuit
(EMI).But the buffer that the prior art has can consume more energy, can not solve the problems, such as that leakage inductance energy dissipates.
Fig. 4 is that a kind of inverse-excitation type with active clamp circuit (Active-Clamp Circuit) in the prior art turns
Parallel operation.Active clamp circuit is made of switching tube Qpc1 and capacitor Cpc1.The prior art can reduce the due to voltage spikes of VD1,
The energy in leakage inductance is recycled simultaneously, improves the efficiency of flyback converter.But using one of the prior art on condition that transformation
The leakage inductance of device encloses magnetizing inductance much smaller than its main sideline, and in other words transformer needs the quite high coefficient of coup, therefore this is existing
There is technology to be not particularly suited for the lower situation of transformer coupling coefficient.In addition, the prior art needs to increase an active drive
Switching tube, a capacitor, control circuit is more complicated, increases the cost of circuit.
Fig. 5 is that a kind of standard with the lowest point detection circuit (Valley Detection Circuit) in the prior art is humorous
Shake (Quasi-Resonant) flyback converter and its work wave.In t4 to t5 stage, entire main sideline circle is opened with first
The drain parasitic capacitance resonance of Q1 is closed, the lowest point detection circuit detects waveform of the VD1 in this stage, and selects VD1 weight in trough
It is new to open switching tube Q1.The prior art can reduce the drain voltage of Q1 conducting eve, to reduce switching loss.But
It has dissipated to the greatest extent in t4-t5 stage leakage inductance energy, therefore the prior art can not reduce the loss of leakage inductance energy.
Utility model content
In view of the above problem, the embodiment of the present application provides a kind of electric power converter.
The embodiment of the present application provides a kind of electric power converter, and the electric power converter includes: controller, transformer,
One switch and first capacitor device and secondary side diode；One end of the first switch respectively with the main sideline of the transformer
The connection of the input terminal of circle and the controller, the other end ground connection of the first switch, the main sideline circle of the transformer X1
The other end is connect with supply voltage VDD1；The first capacitor device is in parallel with the first switch；The one of the secondary side diode
End is connect with the secondary coil of transformer, and the other end and load connect；The output end of the controller and the control of first switch
End connection, the controller control being turned on or off for the first switch according to the voltage value that input terminal transmission is come in.
Electric power converter provided by the embodiments of the present application has the beneficial effect that
Electric power converter provided by the embodiments of the present application, first switch are periodically connected and disconnect, suitable by selecting
First capacitor, can make during first switch disconnects, the leakage inductance of transformer and first capacitor resonance time are no more than one
A harmonic period can achieve the purpose for reducing the energy loss in leakage inductance in this way.
The suitable first capacitor, while making the voltage of one end of first switch caused by leakage inductance and first capacitor resonance
The valley of fluctuation can be less than first threshold voltage, and first threshold voltage specifically can be no-voltage.Controller is according to input terminal
The voltage value that transmission is come in controls first switch in the turn-off time length of next cycle.Controller available first is opened
The voltage value of one end of period is opened in shutdown, and the voltage of one end of first switch conducting eve and first threshold voltage are carried out
Compare, if the former voltage value is higher than first threshold voltage, controller is long to the turn-off time of first switch next cycle
Degree is adjusted, until first switch conducting eve one end voltage value be lower than first threshold voltage, can achieve in this way
Reduce the purpose of switching loss.
Above objects, features, and advantages to enable the embodiment of the present application to be realized are clearer and more comprehensible, be cited below particularly compared with
Good embodiment, and cooperate appended attached drawing, it is described in detail below.
Detailed description of the invention
Illustrate the technical solutions in the embodiments of the present application or in the prior art in order to clearer, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 a is the circuit diagram of electric power converter in the prior art；
Fig. 1 b is the equivalent circuit diagram of electric power converter in the prior art；
Fig. 2 is the waveform diagram of electric power converter working principle in the prior art；
Fig. 3 is a kind of electric power converter with buffer in the prior art；
Fig. 4 is a kind of electric power converter with active clamp circuit in the prior art；
Fig. 5 is a kind of quasi-resonance electric power converter with the lowest point detection circuit in the prior art；
Fig. 6 shows a kind of circuit diagram of specific embodiment of electric power converter provided by the embodiments of the present application；
Fig. 7 shows the equivalent circuit diagram of transformer in Fig. 6；
Fig. 8 shows the waveform diagram of the working principle of electric power converter provided by the embodiments of the present application；
Fig. 9 shows a kind of circuit diagram of specific embodiment of the controller of the embodiment of the present invention；
Figure 10 shows a kind of circuit diagram of specific embodiment of the gate voltage detection circuit of the embodiment of the present invention；
Figure 11 shows the work wave of drain voltage detection circuit；
Figure 12 shows a kind of circuit of specific embodiment of another kind of electric power converter provided by the embodiments of the present application
Figure；
The circuit diagram of another specific embodiment of Figure 13 electric power converter provided by the embodiments of the present application.
Specific embodiment
In order to solve the above technical problems, the embodiment of the present application provides following electric power converter, below in conjunction with attached drawing,
It describes in detail to the electric power converter in the embodiment of the present application.
Embodiment
Fig. 6 specifically is referred to, Fig. 6 shows electric power converter provided by the embodiments of the present application, the electric power converter packet
It includes: controller 110, transformer X1, first switch Q1, first capacitor device C1 and secondary side diode Ds1；The first switch Q1
One end connect respectively with one end of the main sideline of transformer X1 circle and the input terminal of the controller 110, described the
The other end of one switch Q1 is grounded, and the main sideline circle other end of the transformer X1 is connect with supply voltage VDD1；Described first
Capacitor C1 is in parallel with the first switch Q1；One end of the secondary coil of one end and transformer of the secondary side diode Ds1
Connection, the other end of Ds1 and load connect；The control terminal of the output end of the controller 110 and the first switch Q1 connect
It connects, the controller 110 controls being turned on or off for the first switch Q1 according to the voltage value that input terminal transmission is come in.
The coefficient of coup k of transformer X1 is less than 1, it is preferable that k can be less than 0.9, and transformer X1 is specifically as follows miniature change
Depressor, size are no more than 5 millimeters.The isolation voltage of transformer X1 can be greater than 1000V, refer to Fig. 7, Fig. 7 shows figure
The equivalent circuit diagram of middle transformer X1, Lm1 are the magnetizing inductances of the main sideline circle L11 of transformer X1, and Lk1 is transformer X1
Leakage inductance.
Lp1 and Ls1 constitutes ideal transformer, and Lp1 and Ls1 turn ratio are 1:n, and n may be greater than 0 any number.
There is following relationship between L11, L22, Lk1, Lm1, n, k:
The anode of Same Name of Ends and the power vd D1 of the main sideline circle L11 of the transformer X1 are connect, the different name end of L11 and
One end of the first switch Q1 connects, and the first switch Q1 is specifically as follows NMOS tube, and the different name end of L11 can be with NMOS
The drain electrode of pipe connects.The electric current for flowing through L11 is iL11, and the Same Name of Ends of the secondary coil L22 of the transformer X1 is with secondary side electric
Gesture GND2 connection, the different name end of L22 are connect with the anode of diode Ds1 described in secondary side.The cathode of Ds1 and one end of load connect
It connects, the electric current for flowing through Ds1 is iDs1, and the other end of load is connect with GND2.
The first switch Q1 is specifically as follows NMOS tube, refers to Fig. 6, the grid of the NMOS pipe and the control
The output end of device 110 connects, and the grid voltage of the NMOS tube is VG1, the drain electrode of the NMOS tube and the main side of transformer X1
Coil L11 connection, the drain voltage of the NMOS tube are VD1, and the source electrode of the NMOS tube is grounded.
The first capacitor device C1 may include the drain parasitic capacitor Cd1 and auxiliary capacitor Cx of first switch,
The capacitor parasitics Cd1 is in parallel with the auxiliary capacitor Cx.First capacitor device C1 can also only include capacitor parasitics
Cd1。
By selecting suitable first capacitor C1, can make during the first switch disconnects, the leakage inductance of transformer
It is no more than a harmonic period with first capacitor resonance time, can achieve the purpose for reducing the energy loss in leakage inductance in this way.
The suitable first capacitor, while making the valley of the drain voltage VD1 fluctuation of Q1 caused by leakage inductance and first capacitor resonance can
To be less than first threshold voltage, it is preferred that first threshold voltage can be not more than 2 volts, it is preferred that first threshold voltage can not
Greater than 1 volt, first threshold voltage specifically can be no-voltage.
Too small C1 makes the resonance frequency of Lk1 and C1 excessively high, to be difficult in the first few of Lk1 and C1 resonance week
Q1 is opened in phase.Excessive C1 makes the amplitude of Lk1 and C1 resonance too small, thus VD1 caused by can not making because of Lk1 and C1 resonance
Voltage fluctuation valley be less than first threshold voltage.The value of suitable first capacitor C1 is within following ranges.
Wherein, fsFor the switching frequency of the first switch Q1, Lk1For the leakage inductance of the transformer X1, k is the change
The coefficient of coup of depressor X1, equivalent secondary coil Ls1 and equivalent main sideline that n is transformer X1 enclose the turn ratio of Lp1, VO1For institute
State the output voltage of electric power converter, VDD1For supply voltage.
When the drain parasitic capacitance Cd1 of Q1 meets above-mentioned condition, C1 can be individually composed by Cd1, not comprising additional
Capacitor；When the parasitic capacitance Cd1 of Q1 is less thanWhen, C1 includes Cd1 and additional capacitor Cx.Preferably, Cx can
To be integrated MOS capacitor, Metal-Insulator-Metal (MIM) capacitor or Metal-Oxide-Metal (MOM) electricity
Hold.
The coefficient of coup of the transformer X1 meetsWherein, the equivalent secondary side that n is transformer X1
The turn ratio of coil Ls1 and equivalent main sideline circle Lp1, VO1For the output voltage of the electric power converter, VDD1For supply voltage.
Fig. 8 is referred to, Fig. 8 shows the work wave of electric power converter provided by the embodiments of the present application.Q1 is periodic
The drain voltage VD1 of conducting and disconnection, first stage t1 to t2, switching tube Q1 conducting, diode Ds1 shutdown, Q1 is equal to 0.The
Two-stage t2 to t3, Q1 shutdown, after VD1 rises rapidly and Ds1 is connected, leakage inductance Lk1 and first capacitor C1 resonance.Currently
Some applications in, will use the transformer with the lower coefficient of coup, such as the coupling coil sum aggregate in wireless power transfer
At the miniature transformer in isolated power supply, the lower coefficient of coup means biggish leakage inductance Lk1.In the case of in this way Lk1 with
The resonance amplitude of C1 is larger, and resonance frequency is lower.Due to having selected suitable C1, during Q1 is disconnected, i.e. t2 to t3 rank
Section, it is ensured that Lk1 and C1 resonance are no more than a cycle, can effectively recycle the energy in leakage inductance in this way, reduce in leakage inductance
On energy loss.
Due to having selected suitable C1, the valley of the voltage fluctuation of VD1 can be less than first threshold voltage.Since NMOS is posted
The presence of raw body diode, the valley of the voltage fluctuation of VD1 will not be less than the conducting voltage of negative NMOS parasitic body diode.Control
Device processed can detecte the VD1 in t2 to the t3 stage, and the Q1 VD1 for opening eve is compared with first threshold voltage, if
The former is higher than first threshold voltage by voltage, then turn-off time length of the controller to Q1 in next period, i.e. Toff are adjusted,
Until the VD1 that Q1 opens eve is lower than threshold voltage.
VD1 points of t2 to t3 stage are three kinds of situations, respectively shown in Fig. 8 (a), Fig. 8 (b) and Fig. 8 (c).Due to this three
The VD1 of kind of situation has a different waveforms, controller can the Toff accordingly to Q1 in a next period make different adjustment.?
In situation shown in Fig. 8 (a), VD1 opens eve in Q1 and is higher than first threshold voltage, and controller will increase Q1 next
Toff, until the VD1 that Q1 opens eve is lower than first threshold voltage；In the situation shown in Fig. 8 (b), VD1 is before Q1 unlatching
A moment is higher than first threshold voltage, and controller will reduce Q1 in the Toff of next cycle, until Q1 opens the VD1 of eve
Lower than first threshold voltage.In the situation shown in Fig. 8 (c), the VD1 that Q1 opens eve is lower than first threshold voltage, control
Device will not change Q1 in the Toff in a next period.Therefore in stable state, Q1 opens the VD1 of eve lower than first threshold electricity
Pressure.First threshold voltage is typically designed to lower voltage, it is preferred that first threshold voltage is not higher than 2 volts, it is preferred that first
Threshold voltage is not higher than 1 volt, specifically can be no-voltage.Therefore electric power converter has lesser switching loss
The embodiment of the present application can effectively recycle the energy in leakage inductance in the case where only increasing a capacitor, subtract simultaneously
Lack switching loss, improves the efficiency of electric power converter.Different from having the flyback converter of buffer, the embodiment of the present application
The energy in leakage inductance can be recycled.Different from the flyback converter with active clamp circuit, the embodiment of the present application is without increasing
New switching tube, and can be used for the lower situation of transformer coupling coefficient.Different from having the quasi-resonance of the lowest point detection circuit
Flyback converter, the switching tube in the embodiment of the present application opened in leakage inductance and capacitor resonance rather than entire main sideline circle with
It is opened when capacitor resonance, the energy in leakage inductance does not dissipate to the greatest extent at this time, therefore leakage inductance energy recycling may be implemented.
Fig. 9 is referred to, Fig. 9 shows a kind of circuit diagram of specific embodiment of the controller of the embodiment of the present invention.Institute
Stating controller 110 includes drain voltage detection circuit 111, auxiliary circuit 113 and grid control circuit 112；The drain electrode electricity
The input terminal of detection circuit 111 and the drain electrode of one end of the main sideline of transformer X1 circle and first switch Q1 is pressed to connect,
The output end of the drain voltage detection circuit 111 is connect with the input terminal of the grid control circuit 112, the grid control
The output end of circuit 112 is connect with the grid of the first switch Q1；The auxiliary circuit 113 is examined with the drain voltage respectively
Slowdown monitoring circuit 111 and grid control circuit 112 connect.
In t2 to t3 stage, drain voltage detection circuit 111 detects the voltage of VD1, judges VD1 tri- kinds of feelings of corresponding Fig. 8
One of shape, and for output signal VDT1 to grid control circuit 112, it is next one that grid control circuit 112 controls Q1 accordingly
Period increases Toff, reduces Toff or keep Toff constant.
The auxiliary circuit 113 provides reference voltage, reference current, overvoltage protection, overload protection, overheat protector, under-voltage
The functions such as locking, electrification reset, electrostatic protection.
0, Figure 10 shows a kind of specific embodiment of the drain voltage detection circuit of the embodiment of the present invention referring to Figure 1
Circuit diagram.The drain voltage detection circuit 111 includes first comparator CMP1, second switch Ss, third switch SR；It is described
The positive input terminal and S of first comparator CMP1sOne end connection, the negative input end of the first comparator CMP1 are connected to the first threshold
Threshold voltage VTH1；The second switch SsIt is connected to the just defeated of one end of the first switch Q1 and the first comparator CMP1
Enter between end；The third switch SROne end connect with the positive input terminal of the first comparator CMP1, the other end ground connection.Ss
It is connected in t2 to t3 stage, VD1 and VTH1 are compared by CMP1 when conducting, and output signal VDT1 is to grid control circuit.
The a bit of time is connected in t2 eve in SR, for VDT1 to be reset to low potential.
1, Figure 11 shows operating wave of the drain voltage detection circuit shown in Fig. 10 under three kinds of situations referring to Figure 1
Shape.Figure 11 (a) shows Toff and is gradually increased until VD1 is less than the situation of VTH1 in Q1 conducting eve, and Figure 11 (b) is shown
Toff is progressively smaller until that VD1 is less than the situation of VTH1 in Q1 conducting eve, and Figure 11 (c) shows Toff and remains unchanged
Situation.
In another specific embodiment of the application, the first switch Q1 is specifically as follows PMOS tube, refers to
Figure 12, the grid of the PMOS tube are connect with the output end of the controller 110, and the source electrode of the PMOS tube connects to power supply,
The drain electrode of the PMOS tube is connect with the input terminal of the main sideline of transformer X1 circle and the controller 110.
In a kind of specific embodiment of the application, referring to Figure 13, the secondary coil L22 Same Name of Ends of the first transformer
It is connect with secondary side diode Ds1 cathode, the different name end of secondary coil L22 is connect with output voltage, Ds1 anode and secondary side earth potential
GND2 connection.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For device class embodiment, since it is basically similar to the method embodiment, so being described relatively simple, related place ginseng
See the part explanation of embodiment of the method.
In several embodiments provided herein, it should be understood that disclosed device and method can also pass through it
Its mode is realized.The apparatus embodiments described above are merely exemplary, for example, the flow chart and block diagram in attached drawing are aobvious
The device of multiple embodiments according to the application, architectural framework in the cards, the function of method and computer program product are shown
It can and operate.In this regard, each box in flowchart or block diagram can represent one of a module, section or code
Point, a part of the module, section or code includes one or more for implementing the specified logical function executable
Instruction.It should also be noted that function marked in the box can also be attached to be different from some implementations as replacement
The sequence marked in figure occurs.For example, two continuous boxes can actually be basically executed in parallel, they sometimes may be used
To execute in the opposite order, this depends on the function involved.It is also noted that each of block diagram and or flow chart
The combination of box in box and block diagram and or flow chart can be based on the defined function of execution or the dedicated of movement
The system of hardware is realized, or can be realized using a combination of dedicated hardware and computer instructions.
In addition, each functional module in each embodiment of the application can integrate one independent portion of formation together
Point, it is also possible to modules individualism, an independent part can also be integrated to form with two or more modules.
It, can be with if the function is realized and when sold or used as an independent product in the form of software function module
It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) execute each embodiment the method for the application all or part of the steps.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.It needs
Illustrate, herein, relational terms such as first and second and the like be used merely to by an entity or operation with
Another entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this realities
The relationship or sequence on border.Moreover, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also including
Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, article or equipment in there is also other identical elements.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.It should also be noted that similar label and letter exist
Similar terms are indicated in following attached drawing, therefore, once being defined in a certain Xiang Yi attached drawing, are then not required in subsequent attached drawing
It is further defined and explained.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can easily think of the change or the replacement, and should all contain
Lid is within the scope of protection of this application.Therefore, the protection scope of the application shall be subject to the protection scope of the claim.
Claims (14)
1. a kind of electric power converter, which is characterized in that the electric power converter includes: controller, transformer, first switch,
One capacitor and secondary side diode；
One end of the first switch is connect with the input terminal of the main sideline of transformer circle and the controller respectively, institute
The other end ground connection of first switch is stated, the main sideline circle other end of the transformer is connect with supply voltage；The first capacitor
Device is in parallel with the first switch；
One end of the secondary side diode and the secondary coil of transformer connect, and the other end of the secondary side diode and load connect
It connects；The output end of the controller and the control terminal of first switch connect, the electricity that the controller is come according to input terminal transmission
Pressure value controls being turned on or off for the first switch；
During the first switch disconnects, the time of the first capacitor and the leakage inductance resonance of the transformer is humorous no more than one
It shakes the period；
Eve is connected in the first switch, and the voltage value at the both ends of the first switch is less than first threshold voltage.
2. electric power converter according to claim 1, which is characterized in that the first capacitor device meets
Wherein, fsFor the switching frequency of the first switch, Lk1For the transformer
Leakage inductance, k are the coefficient of coup of the transformer, and n is the equivalent secondary coil of the transformer and the circle of equivalent main sideline circle
Number ratio, VO1For the output voltage of the electric power converter, VDD1For supply voltage.
3. electric power converter according to claim 2, which is characterized in that the first capacitor device includes at least described first
The capacitor parasitics of switch；The first capacitor device may include the capacitor parasitics and auxiliary capacitor of the first switch
Device, the capacitor parasitics are in parallel with the auxiliary capacitor.
4. electric power converter according to claim 1, which is characterized in that the first threshold voltage is not higher than 2 volts.
5. electric power converter according to claim 1, which is characterized in that the first threshold voltage is not higher than 1 volt.
6. electric power converter according to claim 1, which is characterized in that the first threshold voltage is no-voltage.
7. electric power converter according to claim 1, which is characterized in that the controller includes drain voltage detection electricity
Road, auxiliary circuit and grid control circuit；
One end of the input terminal of the drain voltage detection circuit and the main sideline circle of the transformer and the first switch
Connection, the output end of the drain voltage detection circuit are connect with the input terminal of the grid control circuit, the grid control
The output end of circuit is connect with the control terminal of the first switch；The auxiliary circuit respectively with the drain voltage detection circuit
And grid control circuit connection.
8. electric power converter according to claim 7, which is characterized in that the drain voltage detection circuit includes the first ratio
Compared with device, second switch, third switch；
The positive input terminal of the first comparator is connect with one end of the second switch, the negative input end of the first comparator
It is connected to first threshold voltage, the second switch is connected to the just defeated of one end of the first switch and the first comparator
Enter between end；One end of the third switch is connect with the positive input terminal of the first comparator, other end ground connection.
9. electric power converter according to claim 1, which is characterized in that the first switch is NMOS tube, the NMOS
The grid of pipe is connect with the output end of the controller, and the drain electrode of the NMOS tube and the main sideline of transformer are enclosed and connected, described
The source electrode of NMOS tube connects main side earth potential.
10. electric power converter according to claim 1, which is characterized in that the first switch is PMOS tube, the PMOS
The grid of pipe is connect with the output end of the controller, and the source electrode of the PMOS tube is connect with supply voltage, the PMOS tube
The main sideline of drain electrode and the transformer, which is enclosed, to be connected.
11. electric power converter according to claim 2, which is characterized in that the coefficient of coup of the transformer meets
Wherein, n is the equivalent secondary coil of the transformer and the turn ratio of equivalent main sideline circle, VO1For
The output voltage of the electric power converter, VDD1For supply voltage.
12. electric power converter according to claim 3, which is characterized in that the auxiliary capacitor includes integrated MOS electricity
One of appearance, Metal-Insulator-Metal (MIM) capacitor, Metal-Oxide-Metal (MOM) capacitor are a variety of.
13. electric power converter according to claim 1, which is characterized in that the transformer is miniature transformer, transformer
Full-size is no more than 5 millimeters.
14. electric power converter according to claim 13, which is characterized in that the transformer is isolating transformer, every
Ionization voltage is greater than 1000 volts.
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| CN201821538582.9U CN208849675U (en) | 2018-09-19 | 2018-09-19 | Electric power converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923661A (en) * | 2018-09-19 | 2018-11-30 | 重庆线易电子科技有限责任公司 | Electric power converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923661A (en) * | 2018-09-19 | 2018-11-30 | 重庆线易电子科技有限责任公司 | Electric power converter |
| CN108923661B (en) * | 2018-09-19 | 2024-04-16 | 深圳线易微电子有限公司 | Power converter |
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Effective date of registration: 20231222 Address after: Room 803, Building D, Jinxiu Phase III, No. 85 Hudipi, Songxuan Community, Guanhu Street, Longhua District, Shenzhen City, Guangdong Province, 518110 Patentee after: Shenzhen Line Easy Microelectronics Co.,Ltd. Address before: 401120 data of Xiantao street, Yubei District, Chongqing 19 Patentee before: CHONGQING XIANYI ELECTRONIC TECHNOLOGY Co.,Ltd. |