CN207382196U - A kind of switching power circuit and its Switching Power Supply - Google Patents
A kind of switching power circuit and its Switching Power Supply Download PDFInfo
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- CN207382196U CN207382196U CN201820119971.1U CN201820119971U CN207382196U CN 207382196 U CN207382196 U CN 207382196U CN 201820119971 U CN201820119971 U CN 201820119971U CN 207382196 U CN207382196 U CN 207382196U
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Abstract
The utility model is related to a kind of switching power circuit, including on-off circuit and transformer；The on-off circuit includes first switch pipe and second switch pipe, and the control terminal of the first switch pipe and second switch pipe is connected to the output terminal of the switch controlling signal；One switch terminals of the first switch pipe are connected to direct-flow input end, and pass through the first capacitance and the second capacity earth of concatenation；Another switch terminals of the first switch pipe are connected with a switch terminals of the second switch pipe, another switch terminals ground connection of the second switch pipe；The tie point of first capacitance and the second capacitance is by the primary and the 3rd capacitance connection in another switch terminals of the first switch pipe；The transformer is formed by magnet ring and conducting wire coiling.The utility model further relates to a kind of Switching Power Supply.Implement a kind of switching power circuit and its Switching Power Supply of the utility model, have the advantages that：Its contactor frequency is higher, transformer input capacitance is smaller.
Description
Technical field
The utility model is related to power electronics field, more specifically to a kind of switching power circuit and its switch
Power supply.
Background technology
In order to promote the energy efficiency of power electronic equipment, the power semiconductor technology with lower-wattage loss is
Key point.In the semiconductor device, the reduction of power attenuation can improve system effectiveness, and bring direct energy saving.
As the switching device of conventional electric power electronics conversion, Si IGBT have been difficult to meet demand, and semiconductor device carborundum
MOSFET and gallium nitride HEMT power switch pipe have better performance, are generally considered the power device of a new generation.Carbonization
Silicon MOSFET and gallium nitride HEMT power switch pipe working frequency are high and heat-resisting ability is strong, at the same have on state resistance low again and
The features such as switching loss is small is the application trend that high-frequency and high-voltage occasion power density improves and efficiency improves.In short, on the whole
From the point of view of, the frequency rise of switching device or on-off circuit is a kind of trend.But conventionally, as device in itself
Limitation and the high frequency transformer for generally using EI type magnetic cores cause transformer volume in itself and its input capacitance larger,
So that the offer of the power density of the raising of switching frequency and power supply in itself is all subject to certain restrictions.
Utility model content
The technical problems to be solved in the utility model is, for the prior art foregoing circuit switching frequency it is relatively low, become
The defects of depressor input capacitance is larger, provides that a kind of contactor frequency is higher, a kind of smaller switch of transformer input capacitance
Power circuit and its Switching Power Supply.
Technical solution is used by the utility model solves its technical problem：A kind of switching power circuit is constructed, including
For the DC waveform of input to be converted to AC wave shape on-off circuit and the AC wave shape for exporting on-off circuit coupling
It is transferred to its secondary transformer；The on-off circuit include first switch pipe and second switch pipe, the first switch pipe and
The control terminal of second switch pipe is connected to the output terminal of the switch controlling signal, receives the switch controlling signal；Described
One switch terminals of one switching tube are connected to direct-flow input end, and pass through the first capacitance and the second capacity earth of concatenation；It is described
Another switch terminals of first switch pipe are connected with a switch terminals of the second switch pipe, the second switch pipe it is another
A switch terminals ground connection；The tie point of first capacitance and the second capacitance is existed by the primary and the 3rd capacitance connection
In another switch terminals of the first switch pipe；The transformer secondary output is connected with the output par, c of the Switching Power Supply；Institute
Transformer is stated to be formed by magnet ring and conducting wire coiling.
Further, the first switch pipe and second switch pipe include silicon carbide MOSFET or gallium nitride FET power
Switching tube.
Further, a switch terminals of the first switch pipe are the drain electrodes of the switching tube, another switch terminals
It is the source electrode of the switching tube；The switch terminals of the second switch pipe are the drain electrodes of the switching tube, another switch terminals is that this is opened
Close the source electrode of pipe；The control pole of the first switch pipe and second switch pipe is its grid.
Further, the magnet ring is high magnetic conductivity and low loss magnet ring, the switch controlling signal of the Switching Power Supply
Frequency is between 150kHz to 300kHz.
Further, the number of turn of the armature winding of the transformer and secondary windings is less than 10.
Further, the turn ratio of the armature winding of the transformer and secondary windings is 3:4.
Further, the first switch pipe and the control terminal of the second switch pipe control signal connected are identical or described
The control terminal of first switch pipe and second switch pipe connects the control signal between each other with setting difference respectively.
Further, further include and be connected to control signal output and the first switch pipe control terminal and
The first phase-shift circuit and the second phase-shift circuit between two switch controlled ends, phase shift value between two phase-shift circuits not phase
Together；The phase-shift circuit is RC series circuits, and resistance value and capacitance determine its phase shift value.
The utility model further relates to a kind of Switching Power Supply, and the Switching Power Supply uses the Switching Power Supply in above-mentioned any one
Circuit.
Implement a kind of switching power circuit and its Switching Power Supply of the utility model, have the advantages that：Due to adopting
With magnet ring and the transformer of conducting wire coiling so that the input capacitance of the transformer is smaller, in addition the cooperation of capacitance so that adopt
It can be substantially from the influence of transformer input capacitance, so that it is opened with the switching frequency of the power circuit of such structure
Closing frequency can be greatly improved.Meanwhile but also the scope of applicable switching device is larger, it can use and such as be carbonized
The device of silicon MOSFET or gallium nitride FET power switch pipes etc.Therefore, contactor frequency is higher, transformer input is electric
Hold smaller.
Description of the drawings
Fig. 1 is the structure of switching power circuit in a kind of switching power circuit of the utility model and its Switching Power Supply embodiment
Schematic diagram；
Fig. 2 is the structure diagram of the switching power circuit in the embodiment in another case；
Fig. 3 is the structure diagram of transformer in the embodiment.
Specific embodiment
The utility model embodiment is described further below in conjunction with attached drawing.
As shown in Figure 1, in a kind of switching power circuit of the utility model and its Switching Power Supply embodiment, switch electricity
Source circuit, on-off circuit (i.e. Fig. 1 including being used to be converted to the DC waveform (i.e. INPUT in Fig. 1) inputted AC wave shape
In switch topology part) and by the AC wave shape coupled transfer that the on-off circuit exports to its secondary transformer T1；Institute
Stating on-off circuit includes first switch pipe Q1 and second switch pipe Q2, the control of the first switch pipe Q1 and second switch pipe Q2
End is connected to the output terminal (i.e. pwm signal input terminal in Fig. 1) of the switch controlling signal, receives the switch control letter
Number；A switch terminals of the first switch pipe Q1 are connected to direct-flow input end, and pass through the first capacitance C1 and second of concatenation
Capacitance C2 ground connection (i.e. at one of above-mentioned first switch pipe Q1 between switch terminals and ground, be connected with the first capacitance C1 of series connection with
Second capacitance C2)；Another switch terminals of the first switch pipe Q1 are connected with a switch terminals of the second switch pipe Q2,
Another switch terminals ground connection of the second switch pipe Q2；The tie point of the first capacitance C1 and the second capacitance C2 pass through described
The primary of transformer T1 and the 3rd capacitance C3 are connected in another switch terminals of the first switch pipe Q1；The transformer T1
It is secondary to be connected with the output par, c (i.e. OUTPUT parts in Fig. 1) of the Switching Power Supply；The transformer T1 is by magnet ring and leads
Line coiling forms (structure of transformer T1 refers to Fig. 3).In the present embodiment, above-mentioned transformer T1 is different from traditional power supply
Transformer is not that the coiling very skeleton of multiturn number coil and magnetic core (such as magnetic core of EI shapes) is used to be composed, and
It is using magnet ring, utilizes the number of turn that conducting wire coiling is considerably less, it is possible to realizes the work of the half-bridge topology power supply, such as scheme
Shown in 3, it can be seen that the number of turn of coil is considerably less on magnet ring, (such as 3：4) simple, the equivalent electricity of transformer primary and secondary, is made
Appearance is very low, and such as the primary and secondary equivalent capacity of transformer T1 is less than 2.5pF, and first isolation effect meeting in the present embodiment
More preferably, such as by original transformer isolation voltage for 4 kilovolts promoted to 6 kilovolts, suitable for widely applying.It is more specific and
Speech, in the present embodiment, the magnet ring are high magnetic conductivity and low loss magnet ring, the switch controlling signal of the switching power circuit
Frequency is between 150kHz to 300kHz.In general, the armature winding of above-mentioned transformer T1 and the number of turn of secondary windings are less than
10, for example, the turn ratio of the armature winding of transformer T1 and secondary windings is 3 in Fig. 3:4, it is utilized respectively conducting wire in magnetic core not
The circle of coiling 3 and 4 encloses respectively on same position (being usually opposite position).Such turn ratio setting can ensure secondary induction
Voltage will not be too low, disclosure satisfy that secondary demand.
In the present embodiment, opened although above-mentioned first switch pipe Q1 and second switch pipe Q2 can be existing any power
Guan Guan, still, it may be preferable that above-mentioned first switch pipe Q1 and second switch pipe Q2 is silicon carbide MOSFET or gallium nitride FET power
Switching tube (i.e. HEMT).When both new devices are used in the circuit of this embodiment, the advantage of device and circuit obtains
It is preferable to utilize, therefore its performance is greatly improved compared with using common silicon metal-oxide-semiconductor.For example, the structure of above-mentioned transformer T1
So that its input resistance is smaller, so that switching frequency can be greatly improved, so as to be suitble to the new device of above two
The application requirement of part so that entire circuit in performance and obtains larger improvement in stability.
In the present embodiment, a switch terminals of the first switch pipe Q1 are the drain electrodes of the switching tube, another is opened
Guan Duan is the source electrode of the switching tube；The switch terminals of the second switch pipe Q2 are the drain electrodes of the switching tube, another switch terminals
It is the source electrode of the switching tube；The control pole of the first switch pipe Q1 and second switch pipe Q2 are its grids.With in the present embodiment
In case of Fig. 1, in Fig. 1, entire circuit includes Input, switch topology, transformer T1, pwm signal input and Output
Etc. several parts, wherein, Input is inputted as D/C voltage, and voltage, the anode of Input and the first work(are provided for the switch topology
The drain electrode of rate switching tube Q1 is connected with the anode of the first capacitance C1, the negativing ending grounding of Input；Switch topology is by first switch pipe
Q1, second switch pipe Q2, the first capacitance C1 and the second capacitance C2 compositions, the drain electrode of the first power switch pipe Q1 and Input
Anode is connected, and is connected with the anode of the first capacitance C1, the source electrode of the first power switch pipe Q1 and the second power switch pipe Q2's
Drain electrode is connected, and forms first node；The source electrode ground connection of second power switch pipe Q2, the negative terminal of the first capacitance C1 and the second capacitance C2
Anode be connected, formed section point；The negativing ending grounding of second capacitance C2；3rd capacitance C3 is capacitance, and there is both-end to connect
The capacitance connect, since alternating current and direct current working condition is different in circuit, state each other cannot interact, while
It is required that AC signal can smoothly be transferred to late-class circuit from front stage circuits, capacitance blocks the direct current of front and back stages circuit to lead to
Road, while connect alternating current circuit.Transformer T1 as by voltage from primary pass to secondary module it is necessary to have good magnetic every
From with smaller input capacitance, the transformer T1 forms by magnet ring and conducting wire coiling, has armature winding side and secondary windings
Side；Armature winding time one end of the transformer T1 is connected with the section point, and the other end is by connecting above-mentioned capacitance
(i.e. the 3rd capacitance C3, the capacitance can also be considered as the part in switch topology) is connected afterwards with the first node；Become
It is connected after the secondary windings side connection filter circuit of depressor T1 with Output, Output is the above-mentioned switching power circuit
Voltage output part generally includes rectification, voltage stabilizing, filtering etc. function module.Pwm signal input in Fig. 1 is above-mentioned first
Power switch pipe Q1 and the second power switch pipe Q2 provides switch controlling signal, it is made to be connected and be closed according to the control signal
It is disconnected.In Fig. 1, the first power switch Q1 pipes select p-type field-effect tube, and the second power switch pipe Q2 selects N-type field-effect tube.
In the present embodiment, in the case of a kind of, since the type of above-mentioned first switch pipe Q1 and second switch pipe Q2 is different,
The first switch pipe Q1 is identical with the control terminal of the second switch pipe Q2 control signal connected, can also so realize two and open
Pipe is closed to turn in turn；And in another case, when the type of two switching tubes is identical, in order to ensure two switching tube wheel conductances
Lead to, it is necessary to be connected respectively between each other with setting difference for the control terminal of the first switch pipe Q1 and second switch pipe Q2
Control signal.
As shown in Fig. 2, obtain the control of two different differences to realize to handle same control signal
Signal, in the present embodiment, foregoing circuit, which further includes, is connected to control signal output and first switch pipe Q1 controls
The first phase-shift circuit (the resistance R1 and capacitance C4 in Fig. 2) and the second phase shift between end processed and second switch pipe its control terminal
Circuit (the resistance R2 and capacitance C5 in Fig. 2), the phase shift value between two phase-shift circuits differ, i.e., a signal passes through respectively
After above-mentioned two phase-shift circuit, two control signals with out of phase are obtained；Wherein, above-mentioned phase-shift circuit is RC series electricals
Road, resistance value and capacitance determine its phase shift value.
In the present embodiment, as previously mentioned, the number of turn being wound in above-mentioned transformer T1 on magnet ring is considerably less, according to following
Formula：
Wherein, L is the inductance value of transformer；
U0It is magnetic constant, U0=4* π * 10-7；
AeIt is the effective cross section product of magnet ring；
LeIt is the effective magnetic circuit length of magnet ring；
UeIt is the magnetic conductivity of magnet ring；
N is the number of turn of institute's coiling；
As can be seen that Ae、LeIt is determined by magnet ring external form, on same magnet ring, number of turn N, the magnetic of inductance value L and coiling
Conductance UeIt is directly proportional, so, as magnetic conductivity UeIt is constant, when number of turn N reduces, obtained L also very littles.Again：
E is the induced voltage on transformer T1 in formula, i.e. inductance value size is directly proportional to induced voltage；When primary inductance is small
Induced voltage is also small, and according to transformer principle, the voltage of secondary side is also small, and the output voltage values of expected setting are not achieved, meet not
Output requirement.Therefore, in the present embodiment, for the magnetic conductivity of magnet ring had certain requirements, it is necessary to which it is higher.
In addition, again due to
Wherein, B is magnetic induction intensity；
U is the voltage that transformer both ends are loaded；
F is the switching frequency of half-bridge；
The size of B values determines the loss size of the transformer T1, and loss conference causes the temperature of transformer T1 to raise,
Magnetic element all has temperature effect, and when temperature reach a certain height, magnet ring can enter saturation state, and more serious meeting is straight
Connect failure.So B values should be the smaller the better；When voltage U is constant, when the number of turn N of coiling reduces, B values can be caused to increase, at this moment
Waiting increase switching frequency f can equally cause B values to reduce.
In conclusion magnet ring needs to select the magnet ring of high magnetic conductivity and low loss, and switching frequency needs the model in permission
It is higher to enclose interior setting, for example, selecting switch frequency is 200 kHz.
The utility model further relates to a kind of Switching Power Supply, and the Switching Power Supply uses above-mentioned switching power circuit.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed,
But it should not be interpreted as limiting the scope of the present invention.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (9)
1. a kind of switching power circuit, which is characterized in that the DC waveform including being used for input is converted to opening for AC wave shape
Powered-down road and by the AC wave shape coupled transfer that the on-off circuit exports to its secondary transformer；The on-off circuit includes
The control terminal of first switch pipe and second switch pipe, the first switch pipe and second switch pipe is connected to the switch control letter
Number output terminal, receive the switch controlling signal；One switch terminals of the first switch pipe are connected to direct-flow input end, and
Pass through the first capacitance and the second capacity earth of concatenation；Another switch terminals of the first switch pipe and the second switch pipe
A switch terminals connection, the second switch pipe another switch terminals ground connection；The company of first capacitance and the second capacitance
Contact is by the primary and the 3rd capacitance connection in another switch terminals of the first switch pipe；The transformation
The secondary output par, c with the Switching Power Supply of device is connected；The transformer is formed by magnet ring and conducting wire coiling.
2. switching power circuit according to claim 1, which is characterized in that the first switch pipe and second switch pipe bag
Include silicon carbide MOSFET or gallium nitride FET power switch pipes.
3. switching power circuit according to claim 2 a, which is characterized in that switch terminals of the first switch pipe are
The drain electrode of the switching tube, another switch terminals are the source electrodes of the switching tube；The switch terminals of the second switch pipe are the switches
The drain electrode of pipe, another switch terminals are the source electrodes of the switching tube；The control pole of the first switch pipe and second switch pipe is
Its grid.
4. according to the switching power circuit described in claim 1-3 any one, which is characterized in that the magnet ring is high magnetic permeability
Low-loss magnet ring, the frequency of the switch controlling signal of the Switching Power Supply is between 150kHz to 300kHz.
5. switching power circuit according to claim 4, which is characterized in that the armature winding of the transformer and it is secondary around
The number of turn of group is less than 10.
6. switching power circuit according to claim 5, which is characterized in that the armature winding of the transformer and it is secondary around
The turn ratio of group is 3:4.
7. switching power circuit according to claim 6, which is characterized in that the first switch pipe and second switch pipe
The control signal of control terminal connection is identical or the control terminal of the first switch pipe and second switch pipe connects between each other respectively
Control signal with setting difference.
8. switching power circuit according to claim 7, which is characterized in that further include and be connected to control signal output
End and the first phase-shift circuit and the second phase-shift circuit between the first switch pipe control terminal and second switch pipe control terminal,
Phase shift value between two phase-shift circuits differs；The phase-shift circuit is RC series circuits, and resistance value and capacitance determine
Its phase shift value.
9. a kind of Switching Power Supply, which is characterized in that the Switching Power Supply is using the electricity as described in claim 1-8 any one
Road.
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| CN201820119971.1U CN207382196U (en) | 2018-01-24 | 2018-01-24 | A kind of switching power circuit and its Switching Power Supply |
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| CN201820119971.1U CN207382196U (en) | 2018-01-24 | 2018-01-24 | A kind of switching power circuit and its Switching Power Supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111024A (en) * | 2018-01-24 | 2018-06-01 | 深圳市英能达电子有限公司 | A kind of switching power circuit and its Switching Power Supply |
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- 2018-01-24 CN CN201820119971.1U patent/CN207382196U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111024A (en) * | 2018-01-24 | 2018-06-01 | 深圳市英能达电子有限公司 | A kind of switching power circuit and its Switching Power Supply |
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