CN206850675U - Switching power circuit - Google Patents
Switching power circuit Download PDFInfo
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- CN206850675U CN206850675U CN201720645005.9U CN201720645005U CN206850675U CN 206850675 U CN206850675 U CN 206850675U CN 201720645005 U CN201720645005 U CN 201720645005U CN 206850675 U CN206850675 U CN 206850675U
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Abstract
The utility model discloses a kind of switching power circuit, including electric power main circuit, switching tube, primary-side-control circuit, sampling resistor and shunt circuit；The electric power main circuit includes major loop output end；The primary-side-control circuit includes power control terminal and feedback end；The major loop output end of the electric power main circuit connects the drain electrode of the switching tube；The grid of the switching tube connects the power control terminal of the primary-side-control circuit, and the source electrode of the switching tube connects the first end of the sampling resistor；The first end of the sampling resistor is also connected with the feedback end of the primary-side-control circuit and the input of the shunt circuit, and the second end of the sampling resistor connects the output end of the shunt circuit；The output head grounding of the shunt circuit.Using the utility model can avoid because the instantaneous large-current that switching tube failure occurs cause sampling resistor and its surrounding component to be burned the problem of, be effectively improved the security of switching power circuit.
Description
Technical field
It the utility model is related to electronic technology field, more particularly to a kind of switching power circuit.
Background technology
Switching Power Supply is to directly control coupled inductive element (inductance or transformer) by switching tube, passes through perception
The energy storage and exergonic process of element, realize a kind of power supply of voltage or current transformation.It is by adjusting switching tube conducting and cut-off
Time scale, maintain stable output signal, be widely used in the various electronics such as Industry Control, communication office, household consumption
In equipment.
Generally, sampling resistor, the source electrode and original of one end connecting valve pipe of sampling resistor are provided with switching power circuit
The feedback end of side control circuit, other end ground connection.In the course of work of switching power circuit, primary-side-control circuit is according to sampling
The conducting and cut-off of the voltage change controlling switch pipe at resistance both ends, switching power circuit can be made to maintain stable output letter
Number.
However, the present inventor has found that prior art at least has the following disadvantages during the utility model is implemented, when
Due to when certain failure causes the switching tube in switching power circuit to damage or be short-circuit, wink on sampling resistor and primary-side-control circuit
Between flow through very big electric current, easily burn out sampling resistor and its surrounding component, in addition detonator circuit is smoldered, flame and burn
The hazard events such as disconnected copper sheet cabling.
Utility model content
The utility model embodiment technical problem to be solved is, there is provided a kind of switching power circuit, can be effective
The problem of overcoming the instantaneous large-current occurred by switching tube failure to cause sampling resistor and its surrounding component to be burned, is improved
The security of switching power circuit.
In order to solve the above-mentioned technical problem, the utility model embodiment proposes a kind of switching power circuit, including power supply
Main circuit, switching tube, primary-side-control circuit, sampling resistor and shunt circuit；
The electric power main circuit includes major loop output end；The primary-side-control circuit includes power control terminal and feedback
End；
The major loop output end of the electric power main circuit connects the drain electrode of the switching tube；The grid connection of the switching tube
The power control terminal of the primary-side-control circuit, the source electrode of the switching tube connect the first end of the sampling resistor；It is described to adopt
The first end of sample resistance is also connected with the feedback end of the primary-side-control circuit and the input of the shunt circuit, the sampling electricity
Second end of resistance connects the output end of the shunt circuit；The output head grounding of the shunt circuit.
Preferably, the shunt circuit includes the first diode；
The anode of first diode connects the input of the shunt circuit, the negative electrode connection of first diode
The output end of the shunt circuit.
Preferably, the shunt circuit also includes the second diode；
The negative electrode of first diode connects the output end of the shunt circuit, is specially：
The negative electrode of first diode connects the anode of second diode, the negative electrode connection of second diode
The output end of the shunt circuit.
Preferably, the electric power main circuit also includes power input and transformer；
The transformer has the first armature winding connection end and the second armature winding connection end；
The power input connects the first armature winding connection end of the transformer；The second of the transformer is primary
Winding connection end connects the major loop output end of the electric power main circuit.
Preferably, the electric power main circuit also includes RCD absorbing circuits；
The RCD absorbing circuits include RC series arms, first resistor and the 3rd diode；
The power input of the electric power main circuit connects the first end of the RC series arms and the first resistor
First end；Second end of the RC series arms connects the second end of the first resistor and the negative electrode of the 3rd diode；
The anode of 3rd diode connects the major loop output end of the electric power main circuit.
Preferably, the RC series arms include second resistance, 3rd resistor and the first electric capacity；
The first end of the second resistance connects the first end of the RC series arms, and the second end of the second resistance connects
Connect the first end of first electric capacity；The 3rd resistor is in parallel with the second resistance；Second end of first electric capacity connects
Connect the second end of the RC series arms.
Preferably, the RCD absorbing circuits also include the 4th diode；
The anode of 4th diode connects the first end of the first resistor, the negative electrode connection of the 4th diode
Second end of the first resistor.
Preferably, the RCD absorbing circuits also include the second electric capacity；
Second electric capacity and the 3rd diodes in parallel.
Implement the utility model embodiment, have the advantages that：
The switching power circuit that the utility model embodiment provides, by setting up shunt circuit in switching power circuit,
It is and shunt circuit is in parallel with sampling resistor.In switching tube failed shorted or for some reason during barrier damage, because shunt circuit can divide
One part of current is carried on a shoulder pole, flowing through the electric current on sampling resistor will greatly reduce, it is thus possible to avoid instantaneous large-current from causing to sample
The problem of resistance and its surrounding component are burned, it is effectively improved the security of switching power circuit.
Brief description of the drawings
Fig. 1 is a structural representation of the switching power circuit that the utility model embodiment provides；
Fig. 2 is another structural representation for the switching power circuit that the utility model embodiment provides.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Referring to Fig. 1, it is a structural representation of the switching power circuit that the utility model embodiment provides.
Switching power circuit in the present embodiment, including electric power main circuit 10, switching tube QM, primary-side-control circuit 20, adopt
Sample resistance Rs and shunt circuit 30；
The electric power main circuit 10 includes major loop output end；The primary-side-control circuit 20 is including power control terminal and instead
Present end；
The major loop output end of the electric power main circuit 10 connects the drain electrode of the switching tube QM；The grid of the switching tube QM
Pole connects the power control terminal of the primary-side-control circuit 20, and the source electrode of the switching tube QM connects the of the sampling resistor Rs
One end；The first end of the sampling resistor Rs is also connected with the feedback end and the shunt circuit 30 of the primary-side-control circuit 20
Input, the second end of the sampling resistor Rs connect the output end of the shunt circuit 30；The output of the shunt circuit 30
End ground connection.
In the present embodiment, electric power main circuit 10 is used to the ac supply signal (such as civil power) of input being converted to direct current
Source signal, and the conversion of voltage class is realized, think load supplying, in structure, electric power main circuit 10 generally also includes input
Current rectifying and wave filtering circuit, transformer and output rectifier and filter etc..Switching tube QM is generally power field effect transistor or exhausted
Edge grid bipolar transistor.Primary-side-control circuit 20 is used for the corresponding pulse-width controlled of voltage output according to sampling resistor Rs both ends
Signal with controlling switch pipe QM conducting and cut-off, and then makes switching power circuit maintain stable output letter to switching tube QM
Number, in structure, primary-side-control circuit 20 also includes power supply control chip and its peripheral circuit.Sampling resistor Rs opens for reflection
The situation of the output electric signal of powered-down source circuit, after ignoring error, the electric current for flowing through sampling resistor Rs is electric power main circuit 10
Output current, primary-side-control circuit 20 combines sampling resistor Rs resistance and flows through sampling resistor Rs electric current and can obtain and adopts
The voltage at sample resistance Rs both ends, and then the conducting and cut-off of the voltage cut-out pipe QM according to sampling resistor Rs both ends, and be
Reduction power consumption, the sampling resistor Rs general very little of resistance.Shunt circuit 30 is used to form diverter branch, is Rs points of sampling resistor
Stream.It should be noted that electric power main circuit 10 and primary-side-control circuit 20 have various topological structures to select, this practicality is new
Type is not especially limited.
In the switching power circuit that the utility model embodiment provides, in switching tube QM short circuits or barrier damage for some reason, protect
The operation principle for protecting sampling resistor Rs is as follows：In switching tube QM short circuits or barrier damage for some reason, the major loop of electric power main circuit 10
The high voltage of output end output is applied directly at switching tube QM source electrode, is shunted by shunt circuit 30 and sampling resistor Rs,
To reduce sampling resistor Rs electric current is flowed through, sampling resistor Rs is protected with this, so as to avoid sampling resistor Rs and its surrounding
Component (component in such as primary-side-control circuit 20) damages.
In summary, the switching power circuit that the utility model embodiment provides, by being set up in switching power circuit
Shunt circuit 30, and shunt circuit 30 is in parallel with sampling resistor Rs.In switching tube QM failed shorteds or for some reason during barrier damage, by
One part of current can be shared in shunt circuit 30, flowing through the electric current on sampling resistor Rs will greatly reduce, it is thus possible to keep away
Exempt from the problem of instantaneous large-current causes sampling resistor Rs and its surrounding component to be burned, be effectively improved switching power circuit
Security.
For further scheme of the present utility model is described in detail, referring to Fig. 2, hereafter to the one of the present invention
A little preferred embodiments are specifically described or illustrated.
On the basis of the embodiment shown in Fig. 1, in a preferred embodiment, the shunt circuit 30 includes first
Diode D1；
The anode of the first diode D1 connects the input of the shunt circuit 30, the moon of the first diode D1
Pole connects the output end of the shunt circuit 30.
In the present embodiment, in a sampling resistor Rs both ends diode in parallel, shunted with this to realize.Specifically, exist
When switching tube QM in switching power circuit is working properly, the voltage on the input of shunt circuit 30 is less than the first diode D1
Conducting voltage, now the first diode D1 do not work, that is, do not interfere with sampling resistor Rs work；When switching tube QM short circuit or
For some reason during barrier damage, because the big voltage that the major loop output end of electric power main circuit 10 exports is applied directly to switching tube QM source electrode
Place, so that the voltage on the input of shunt circuit 30 is higher than the first diode D1 conducting voltage, and then, the one or two pole
Pipe D1 is turned on, and is shunted for sampling resistor Rs, to protect sampling resistor Rs not burnt out because of instantaneous large-current, so as to avoid circuit from emitting
Cigarette, flame and copper sheet cabling are burned out.Wherein, diode also has voltage clamping effect.It should be noted that in diode
During type selecting, it should cause voltage that the pressure drop of diode exports with major loop output end and sampling resistor Rs's to bear electric current phase
Matching, in the present embodiment, the first diode D1 need to choose the larger diode of pressure drop.
The present embodiment is in parallel with sampling resistor Rs by setting a diode, effectively overcomes because instantaneous large-current is led
The problem of causing sampling resistor Rs and its surrounding component to be burned, and circuit structure is simple, and cost is low.
On the basis of upper one embodiment, in a preferred embodiment, the shunt circuit 30 also includes second
Diode D2；
The negative electrode of the first diode D1 connects the output end of the shunt circuit 30, is specially：
The negative electrode of the first diode D1 connects the anode of the second diode D2, the moon of the second diode D2
Pole connects the output end of the shunt circuit 30.
In the present embodiment, in the diode of sampling resistor Rs both ends two series connection in parallel, shunted with this to realize.Compare
The pressure drop of single diode can be reduced accordingly in the above-mentioned embodiment only with a diode, the present embodiment, and
During one of diode damage, another diode with normal work, can improve the reliability of circuit.
On the basis of any of the above-described embodiment, in a preferred embodiment, the electric power main circuit 10 also includes
Power input Vin and transformer TB1；
The transformer TB1 has the first armature winding connection end and the second armature winding connection end；
The first armature winding connection end of the power input Vin connections transformer TB1；The transformer TB1
The second armature winding connection end connect the major loop output end of the electric power main circuit 10.
In the present embodiment, transformer TB1 and switching tube QM forms the interval concussion of self-excitation (or separate excitation) formula together
Device, so as to which handle is modulated into a high-frequency pulse voltage from the first armature winding connection end input direct voltage.Also, play energy
Transmission and transformation, specifically, are applied in reverse excitation circuit, when switching tube QM is turned on, transformer TB1 is converted electrical current into
Store into magnetic field energy, then discharged when switching tube QM ends；Apply in positive activation type circuit, when switching tube QM is turned on
When, input voltage directly supplies and energy storage in energy storage inductor to load, when switching tube QM ends, then by energy storage electricity
Sense carries out afterflow and transmitted to load.In addition, it is additionally operable to the d. c. voltage signal of the first armature winding connection end input being converted into
The d. c. voltage signal of other required voltage class.
In addition, electric power main circuit 10 also includes load connection end Load, for powering load.Specifically, transformer TB1
Secondary windings connection end pass through output filter circuit connection load connection end Load.
On the basis of any of the above-described embodiment, in a preferred embodiment, the electric power main circuit 10 also includes
RCD absorbing circuits；
The RCD absorbing circuits include RC series arms, first resistor R1 and the 3rd diode D3；
The power input of the electric power main circuit 10 connects the first end of the RC series arms and the first resistor
R1 first end；Second end of the RC series arms connects the second end of the first resistor R1 and the 3rd diode D3
Negative electrode；The anode of the 3rd diode D3 connects the major loop output end of the electric power main circuit 10.
On the basis of upper one embodiment, in a preferred embodiment, the RC series arms include the second electricity
Hinder R2,3rd resistor R3 and the first electric capacity C1；
The first end of the first end connection RC series arms of the second resistance R2, the second of the second resistance R2
End connects the first end of the first electric capacity C1；The 3rd resistor R3 is in parallel with the second resistance R2；First electric capacity
C1 the second end connects the second end of the RC series arms.
It should be noted that in switching power circuit, switching tube QM, may be due to transformer in switching process
TB1 leakage inductances and switching tube QM junction capacity shake caused by due to voltage spikes and damage.Therefore, in the present embodiment, a RCD is set up
Absorbing circuit, for absorbing big due to voltage spikes, with protection switch pipe QM.Specifically, when switching tube QM ends, Switching Power Supply
The voltage reversal of transformer TB1 primary coils in circuit, while the 3rd diode D3 is turned on, leakage inductance releases energy directly to the
One electric capacity C1 is charged, and the voltage at the first electric capacity C1 both ends rises rapidly, subsequently after the 3rd diode D3 ends, the first electricity
Hold C1 to be discharged by first resistor R1, suppress switching tube QM due to voltage spikes with this.
On the basis of upper one embodiment, in a preferred embodiment, the RCD absorbing circuits also include the 4th
Diode D4；
The anode of the 4th diode D4 connects the first end of the first resistor R1, the moon of the 4th diode D4
Pole connects the second end of the first resistor R1.
It should be noted that when the 3rd diode D3 short circuits, second resistance R2 and 3rd resistor R3 electric current is flowed through very
Greatly, it will usually more than second resistance R2 and 3rd resistor R3 can tolerance range, therefore second resistance R2 and 3rd resistor R3
Temperature will be raised significantly, can typically reach 200 DEG C or so, and then cause circuit board carbonization burning, or even trigger peril.
In the present embodiment, the 4th diode D4 is set up, and it is in parallel with first resistor R1.When the 3rd diode D3 is sent out
When raw short-circuit, the 4th diode D4 forward conductions, the power supply signal that power connector end flows into is no longer flow through second resistance R2, the 3rd
Resistance R3, the first electric capacity C1 and first resistor R1, but major loop output end is directly flowed to by the 4th diode D4, and
And the voltage at the sampling resistor Rs both ends caused in switching power circuit is exceeded threshold value by this, and then primary-side-control circuit 20 will
Controlling switch power supply is stopped, it is seen then that the present embodiment can avoid causing electricity because the resistance heating in RC series arms is excessive
The problem of road plate carbonization burning, it is effectively improved the security of circuit.
On the basis of upper one embodiment, in a preferred embodiment, the RCD absorbing circuits also include second
Electric capacity C2；
The second electric capacity C2 is in parallel with the 3rd diode D3.
It should be noted that in order to improve the reliability of RCD absorbing circuits, general 3rd diode D3 can use quick extensive
Multiple diode or supper-fast recovery diode, but such configuration can be produced when the 3rd diode D3 Reverse recoveries compared with
Big di/dt, form stronger EMI interference sources.Therefore, the present embodiment is in the 3rd diode D3 both ends the second electric capacity in parallel
C2, can be on the premise of the 3rd diode D3 reliabilities be ensured, noise caused by the 3rd diode D3 of reduction Reverse recovery is asked
Topic, wherein, the second electric capacity C2 is clamp capacitor.
, can be it should be noted that when the RCD absorbing circuits 100 that present embodiment is provided are applied to Switching Power Supply
Inhibitory action is played to EMC harassing and wrecking during switching tube QM turn-on and turn-off.Specifically, when switching tube QM is turned off, the 3rd diode
D3 is turned on, and now transformer TB1 leakage inductance energies are given to second resistance R2,3rd resistor by the 3rd diode D3 in Switching Power Supply
R3, the first electric capacity C1 and first resistor R1 consumption.Then, when switching tube QM conducting moments, due to the electricity of the first electric capacity C1 and second
Hold C2 and produce capacitive divider, be i.e. the second electric capacity C2 plays bypass effect in charging transient, so as to reduce because of the 3rd diode D3
The larger and caused electric currents of di/dt and oscillation, restrained effectively EMC interference.
The switching power circuit that the utility model embodiment provides, by setting up shunt circuit in switching power circuit,
It is and shunt circuit is in parallel with sampling resistor.In switching tube failed shorted or for some reason during barrier damage, because shunt circuit can divide
One part of current is carried on a shoulder pole, flowing through the electric current on sampling resistor will greatly reduce, it is thus possible to avoid instantaneous large-current from causing to sample
The problem of resistance and its surrounding component are burned, it is effectively improved the security of switching power circuit.
Described above is preferred embodiment of the present utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of the utility model principle is not departed from, some improvement and deformation can also be made, these improve and become
Shape is also considered as the scope of protection of the utility model.
Claims (8)
1. a kind of switching power circuit, it is characterised in that including electric power main circuit, switching tube, primary-side-control circuit, sampling resistor
And shunt circuit；
The electric power main circuit includes major loop output end；The primary-side-control circuit includes power control terminal and feedback end；
The major loop output end of the electric power main circuit connects the drain electrode of the switching tube；Described in the grid connection of the switching tube
The power control terminal of primary-side-control circuit, the source electrode of the switching tube connect the first end of the sampling resistor；The sampling electricity
The first end of resistance is also connected with the feedback end of the primary-side-control circuit and the input of the shunt circuit, the sampling resistor
Second end connects the output end of the shunt circuit；The output head grounding of the shunt circuit.
2. switching power circuit as claimed in claim 1, it is characterised in that the shunt circuit includes the first diode；
The anode of first diode connects the input of the shunt circuit, described in the negative electrode connection of first diode
The output end of shunt circuit.
3. switching power circuit as claimed in claim 2, it is characterised in that the shunt circuit also includes the second diode；
The negative electrode of first diode connects the output end of the shunt circuit, is specially：
The negative electrode of first diode connects the anode of second diode, described in the negative electrode connection of second diode
The output end of shunt circuit.
4. switching power circuit as claimed in claim 1, it is characterised in that the electric power main circuit also includes power input
And transformer；
The transformer has the first armature winding connection end and the second armature winding connection end；
The power input connects the first armature winding connection end of the transformer；Second armature winding of the transformer
Connection end connects the major loop output end of the electric power main circuit.
5. switching power circuit as claimed in claim 1, it is characterised in that the electric power main circuit also includes RCD and absorbs electricity
Road；
The RCD absorbing circuits include RC series arms, first resistor and the 3rd diode；
The first end of the power input connection RC series arms of the electric power main circuit and the first of the first resistor
End；Second end of the RC series arms connects the second end of the first resistor and the negative electrode of the 3rd diode；It is described
The anode of 3rd diode connects the major loop output end of the electric power main circuit.
6. switching power circuit as claimed in claim 5, it is characterised in that the RC series arms include second resistance, the
Three resistance and the first electric capacity；
The first end of the second resistance connects the first end of the RC series arms, the second end connection institute of the second resistance
State the first end of the first electric capacity；The 3rd resistor is in parallel with the second resistance；The second end connection institute of first electric capacity
State the second end of RC series arms.
7. switching power circuit as claimed in claim 6, it is characterised in that the RCD absorbing circuits also include the four or two pole
Pipe；
The anode of 4th diode connects the first end of the first resistor, described in the negative electrode connection of the 4th diode
Second end of first resistor.
8. switching power circuit as claimed in claim 7, it is characterised in that the RCD absorbing circuits also include the second electric capacity；
Second electric capacity and the 3rd diodes in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720645005.9U CN206850675U (en) | 2017-06-05 | 2017-06-05 | Switching power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720645005.9U CN206850675U (en) | 2017-06-05 | 2017-06-05 | Switching power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206850675U true CN206850675U (en) | 2018-01-05 |
Family
ID=60798853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720645005.9U Active CN206850675U (en) | 2017-06-05 | 2017-06-05 | Switching power circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206850675U (en) |
-
2017
- 2017-06-05 CN CN201720645005.9U patent/CN206850675U/en active Active
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