CN206481221U - Inverse-excitation type switch power-supply - Google Patents
Inverse-excitation type switch power-supply Download PDFInfo
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- CN206481221U CN206481221U CN201621495016.5U CN201621495016U CN206481221U CN 206481221 U CN206481221 U CN 206481221U CN 201621495016 U CN201621495016 U CN 201621495016U CN 206481221 U CN206481221 U CN 206481221U
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- inverse
- electric capacity
- type switch
- excitation type
- switch power
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Abstract
The utility model is related to a kind of inverse-excitation type switch power-supply.A kind of inverse-excitation type switch power-supply includes transformer, and primary winding one end is used to connect external voltage input, and the other end is used for connecting valve pipe；Transformer secondary output winding is connected with output end；Rectification circuit, rectification circuit includes diode and the first electric capacity；Diode cathode is connected with secondary windings one end, and the first electric capacity is connected in parallel between diode cathode and the secondary windings other end；Leakage inductance absorbing circuit, leakage inductance absorbing circuit includes secondary windings and the second electric capacity, and the second electric capacity is in parallel with secondary windings；Switching tube, switching tube input is connected with the primary winding other end；Switching tube output end is connected and is grounded with the secondary windings other end；Circuit is controlled, is controlled for switch tube break-make.Above-mentioned inverse-excitation type switch power-supply only need to be in the electric capacity of transformer secondary output winding parallel second, you can reduction switch pipe crest voltage.The circuit components number is few and circuit structure is simple.
Description
Technical field
The utility model is related to switch power technology field, more particularly to a kind of inverse-excitation type switch power-supply.
Background technology
In the low power charger Switching Power Supply produced at present, circuit topological structure typically uses reverse excitation circuit structure.
Leakage inductance voltage absorpting circuit in traditional inverse-excitation type switch power-supply typically uses the suction of resistance, electric capacity and diode combinations
Receive circuit.The absorbing circuit component counts of existing resistance, electric capacity and diode combinations are more, can increase Switching Power Supply PCB
(Printed Circuit Board, printed circuit board) size, therefore increase Switching Power Supply manufacturing cost.While circuit elements device
Part number is more, consumes power, reduces switch power efficiency.
Utility model content
Based on this, it is necessary to provide a kind of inverse-excitation type switch power-supply simple in construction.
A kind of inverse-excitation type switch power-supply, including：Transformer, one end of the armature winding of the transformer is used to connect outside
Voltage input end, the other end of the armature winding is used to be connected with switching tube；The secondary windings of the transformer with it is described anti-
The output end connection of excitation type switch power-supply；Rectification circuit, the rectification circuit includes diode and the first electric capacity；The diode
Positive pole is connected with described secondary windings one end, first electric capacity be connected in parallel the diode negative pole and it is described it is secondary around
Between the other end of group；Leakage inductance absorbing circuit, the leakage inductance absorbing circuit includes the secondary windings and the second electric capacity,
Second electric capacity is in parallel with the secondary windings；Second capacitance connection the diode positive pole and it is described it is secondary around
Between the other end of group；The switching tube, the other end of the input of the switching tube and the armature winding of the transformer connects
Connect；The output end of the switching tube is connected and is grounded with the other end of the secondary windings；The control end of the switching tube and control
Circuit connection processed；And the control circuit, it is controlled for the break-make to the switching tube with to the flyback switching
The work of power supply is controlled.
In one of the embodiments, the inductance of the transformer is the inductance being made up of copper conductor and FERRITE CORE.
In one of the embodiments, second electric capacity is polarity free capacitor.
In one of the embodiments, second electric capacity is ceramic disc capacitor or metal membrane capacitance.
In one of the embodiments, in addition to control chip；The control circuit and the switching tube are integrated in described
In control chip
In one of the embodiments, the model JD3309 of the control chip.
In one of the embodiments, in addition to voltage supply circuit, the first end of the voltage supply circuit and the external voltage
Input is connected, and the first end of the voltage supply circuit is also connected with the control chip, with to the control chip offer work
Voltage；The second end ground connection of the voltage supply circuit.
In one of the embodiments, the voltage supply circuit includes the 3rd electric capacity, the first end of the 3rd electric capacity and institute
State the connection of external input voltage end, the second end ground connection of the 3rd electric capacity；The first end is also connected with the control chip.
In one of the embodiments, in addition to bleeder circuit, the of described bleeder circuit one end and the voltage supply circuit
One end is connected, and the output end of the bleeder circuit is connected with the control chip.
In one of the embodiments, the bleeder circuit includes resistance, described resistance one end and the voltage supply circuit
First end is connected, and the other end of the resistance is connected with the control chip.
Above-mentioned inverse-excitation type switch power-supply, the second electric capacity and transformer secondary output winding parallel, and with transformer secondary output winding structure
Into the leakage inductance absorbing circuit of inverse-excitation type switch power-supply.Second electric capacity causes the flyback voltage of transformer to postpone the knot to switching tube
Electric capacity charges.During this transformer leakage inductance be able to from inductance energy first discharge a part, so as to avoid transformer leakage inductance
Voltage and flyback voltage are superimposed the junction capacity charging to switching tube simultaneously, hence in so that the crest voltage reduction of switching tube, with up to
The purpose absorbed to leakage inductance voltage.The inverse-excitation type switch power-supply only need to be in the electric capacity of transformer secondary output winding parallel second, you can
Reduce switch pipe crest voltage.Compared with the absorbing circuit of traditional resistance, electric capacity and diode combinations, the electricity
Road component counts are few and circuit structure is simple.
Brief description of the drawings
Fig. 1 be an embodiment in inverse-excitation type switch power-supply structured flowchart；
Fig. 2 be an embodiment in inverse-excitation type switch power-supply circuit diagram.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.
Fig. 1 be an embodiment in inverse-excitation type switch power-supply structured flowchart.As shown in figure 1, the inverse-excitation type switch power-supply
Including transformer 100, leakage inductance absorbing circuit 200, rectification circuit 300, switching tube 400 and control circuit 500.
Transformer 100 includes primary inductance L2 and secondary inductance L3, primary inductance L2 one end and external voltage output end 10
Connection, for receiving external input voltage.The primary inductance L2 other end is connected with the input of switching tube 400.Secondary inductance
L3 is used to connect outside output end 20.In the present embodiment, the inductance of transformer 100 is to be made up of copper conductor and FERRITE CORE
Inductance.The control end of switching tube 400 is connected with control circuit 500.The output end of switching tube 400 is another with secondary windings L3's
End connects and is grounded.The break-make that control circuit 500 is used for switch tube 400 is controlled to carry out the break-make of transformer 100
Control, and then realization is controlled to the working condition of inverse-excitation type switch power-supply.Switching tube 400 can be triode.Triode
Colelctor electrode as the input of switching tube 400, the base stage of triode is used as the control end of switching tube 400, the transmitting of triode
Pole as switching tube 400 output end.
Leakage inductance absorbing circuit 200 includes the secondary inductance L3 and the second electric capacity C5 of transformer 100.Second electric capacity C5 is simultaneously
It is associated in secondary inductance L3 two ends.In the present embodiment, the second electric capacity C5 is polarity free capacitor.Such as ceramic disc capacitor, metal film
Electric capacity.Rectification circuit 300 includes diode D2 and the first electric capacity C6.Diode D2 positive pole connects with secondary inductance L3 one end
Connect, diode D2 negative pole is connected with the first electric capacity C6.The first electric capacity C6 other end is connected with the secondary inductance L3 other end.
The output end 20 of the inverse-excitation type switch power-supply is in parallel with the first electric capacity C6.
Above-mentioned inverse-excitation type switch power-supply, the second electric capacity C5 be connected in parallel on diode D2 and transformer 100 secondary inductance L3 it
Between, constitute the leakage inductance absorbing circuit 200 of inverse-excitation type switch power-supply with the secondary inductance L3 of transformer 100.Second electric capacity C5 makes
The flyback voltage for obtaining transformer 100 postpones to the junction capacity charging inside switching tube 400.The leakage inductance of transformer 100 during this
Be able to from inductance energy first discharge a part so that avoid the leakage inductance voltage of transformer 100 and flyback voltage at the same be superimposed to
Junction capacity charging inside switching tube 400, hence in so that the crest voltage of switching tube 400 reduces to reach that leakage inductance voltage absorbs
Purpose.The inverse-excitation type switch power-supply only need to transformer 100 the second electric capacity C5 of secondary inductance parallel connection, you can reduction switch electricity
Source switch pipe crest voltage.Compared with the absorbing circuit of traditional resistance, electric capacity and diode combinations, the circuit components
Number is less and circuit structure is simple.
In the present embodiment, the inverse-excitation type switch power-supply also includes control chip 600.Switching tube 400 and control circuit 500
It is integrated in control chip 600.The model JD3309 of control chip 600.In one embodiment, the inverse-excitation type switch power-supply is also
Including voltage supply circuit 700 and bleeder circuit 800.One end of voltage supply circuit 700 is connected with external voltage input 10.Voltage supply circuit
700 one end being connected with external voltage output end 10 are also connected with bleeder circuit 800, by bleeder circuit 800 to control chip
400 provide operating voltage.The other end ground connection of voltage supply circuit 700.The connection of the input of bleeder circuit 800 and voltage supply circuit 700,
The output end of bleeder circuit 800 is connected with control chip 600.Bleeder circuit 800 is used to enter the output voltage of voltage supply circuit 700
Exported after row partial pressure to control chip 600.
Fig. 2 is the circuit diagram of inverse-excitation type switch power-supply in an embodiment.As shown in Fig. 2 transformer 100 is transformer TFA.
External voltage input 10 is input port Port1.The output port 20 of inverse-excitation type switch power-supply is output port Port2.Control
Coremaking piece 600 is control chip IC1.Control chip IC1 built-in switch triode (not shown), for controlling flyback switching electricity
The unlatching in source and closure.Control chip IC1 pin OC (namely input of switching tube 400) and transformer TFA primary electrical
Feel L2 connections.Control chip IC1 pin OE (namely output end of switching tube 400) and transformer TFA secondary inductance L3's
One end connects and is grounded.Voltage supply circuit 700 is the 3rd electric capacity C2.3rd electric capacity C2 one end is connected with input port Port1, the
Three electric capacity C2 are also connected with input port Port1 connection end with bleeder circuit 800.3rd electric capacity C2 other end ground connection.Point
Volt circuit 800 includes the resistance R2 and resistance R3 of series connection.The resistance R2 other ends are connected with the 3rd electric capacity C2.The resistance R3 other end
It is connected with control chip IC1 pin VCC.The voltage at the 3rd electric capacity C2 two ends is after resistance R2 and resistance R3 partial pressures, output
Control chip IC1 is given, to provide operating voltage to control chip IC1.
As shown in Fig. 2 transformer TFA is exported to flyback switching after receiving external input voltage from input port Port1
The output port Port2 of power supply.Control chip IC1 control transformers TFA break-make.In each switch periods of control chip IC1
Shutdown moment, the voltage of the colelctor electrode of switch triode is made up of three portion voltages, respectively the 3rd electric capacity C2 both end voltages,
The self induction voltage of transformer TFA flyback voltage and transformer TFA leakage inductance.Wherein the 3rd electric capacity C2 both end voltages are by defeated
The ac line voltage connected at inbound port Port1 is determined.3rd electric capacity C2 both end voltages are after resistance R2 and resistance R3 partial pressures
Export the colelctor electrode of the switch triode to control chip IC1.Transformer TFA flyback voltage is by the defeated of inverse-excitation type switch power-supply
Go out voltage and the first inductance turn ratioes of transformer TFA are determined.The self induction voltage of transformer TFA leakage inductance is certain in leakage inductance energy
In the case of determined by the junction capacity size of colelctor electrode-emitter stage (CE poles) of switch triode.
As shown in Fig. 2 causing transformer TFA flyback in transformer TFA secondary inductance L two ends the second electric capacity C of parallel connection
Voltage delay charges to the junction capacity of the CE poles of control chip IC1 switch triode.It that is to say, it is each in control chip IC1
The shutdown moment of switch periods, first from self induction voltage the opening to control chip IC1 of the 3rd electric capacity C2 both end voltages and leakage inductance
Close the junction capacity charging of the CE poles of triode.In the meantime transformer TFA leakage inductance from inductance energy in release a part,
So as to avoid three portion voltages while being superimposed the junction capacity charging of the CE poles to control chip IC1 switch triode, and then
So that the collector peak voltage of switch triode reduces to realize the purpose for reaching that leakage inductance voltage absorbs.
The energy that transformer TFA charges to the second electric capacity C5, in the second electric capacity C5 both end voltages leading higher than diode D2
During the pressure that is powered, the second electric capacity C5 and inductance L3 can produce resonance.Portion of energy in second electric capacity C5 is in the second electric capacity C5 and electricity
The output end that the inverse-excitation type switch power-supply is supplied during resonance occurs for sense L3.Other part energy in second electric capacity C5 is by the second electricity
Hold the internal resistance consumption in the resonant network of C5 and inductance L3 compositions.Choosing suitable second electric capacity C5 value can allow whole circuit to damage
Consumption is minimum.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and it describes more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that for the common skill of this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
Protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of inverse-excitation type switch power-supply, it is characterised in that including：
Transformer, one end of the armature winding of the transformer is used to connecting external voltage input, the armature winding it is another
One end is used to be connected with switching tube；The secondary windings of the transformer is connected with the output end of the inverse-excitation type switch power-supply；
Rectification circuit, the rectification circuit includes diode and the first electric capacity；The diode cathode and the secondary windings one
End connection, first electric capacity is connected in parallel between the other end of the negative pole of the diode and the secondary windings；
Leakage inductance absorbing circuit, the leakage inductance absorbing circuit includes the secondary windings and the second electric capacity, second electricity
Hold in parallel with the secondary windings；Second capacitance connection is in the positive pole of the diode and the other end of the secondary windings
Between；
The switching tube, the input of the switching tube is connected with the other end of the armature winding of the transformer；The switch
The output end of pipe is connected and is grounded with the other end of the secondary windings；The control end of the switching tube is connected with control circuit；
And
The control circuit, is controlled to enter with the work to the inverse-excitation type switch power-supply for the break-make to the switching tube
Row control.
2. inverse-excitation type switch power-supply according to claim 1, it is characterised in that the inductance of the transformer is by copper conductor
And the inductance that FERRITE CORE is constituted.
3. inverse-excitation type switch power-supply according to claim 1, it is characterised in that second electric capacity is polarity free capacitor.
4. inverse-excitation type switch power-supply according to claim 3, it is characterised in that second electric capacity is ceramic disc capacitor or gold
Belong to membrane capacitance.
5. inverse-excitation type switch power-supply according to claim 1, it is characterised in that also including control chip；The control electricity
Road and the switching tube are integrated in the control chip.
6. inverse-excitation type switch power-supply according to claim 5, it is characterised in that the model of the control chip
JD3309。
7. inverse-excitation type switch power-supply according to claim 5, it is characterised in that also including voltage supply circuit, the voltage supply electricity
The first end on road is connected with the external voltage input, and the first end of the voltage supply circuit is also connected with the control chip,
To provide operating voltage to the control chip；The second end ground connection of the voltage supply circuit.
8. inverse-excitation type switch power-supply according to claim 7, it is characterised in that the voltage supply circuit includes the 3rd electric capacity,
The first end of 3rd electric capacity is connected with the external input voltage end, the second end ground connection of the 3rd electric capacity；Described
One end is also connected with the control chip.
9. inverse-excitation type switch power-supply according to claim 7, it is characterised in that also including bleeder circuit, the partial pressure electricity
Road one end is connected with the first end of the voltage supply circuit, and the output end of the bleeder circuit is connected with the control chip.
10. inverse-excitation type switch power-supply according to claim 9, it is characterised in that the bleeder circuit includes resistance, described
Resistance one end is connected with the first end of the voltage supply circuit, and the other end of the resistance is connected with the control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621495016.5U CN206481221U (en) | 2016-12-31 | 2016-12-31 | Inverse-excitation type switch power-supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621495016.5U CN206481221U (en) | 2016-12-31 | 2016-12-31 | Inverse-excitation type switch power-supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206481221U true CN206481221U (en) | 2017-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621495016.5U Active CN206481221U (en) | 2016-12-31 | 2016-12-31 | Inverse-excitation type switch power-supply |
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| CN (1) | CN206481221U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112822815A (en) * | 2021-02-01 | 2021-05-18 | 惠州雷士光电科技有限公司 | LED drive circuit and lighting equipment |
-
2016
- 2016-12-31 CN CN201621495016.5U patent/CN206481221U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112822815A (en) * | 2021-02-01 | 2021-05-18 | 惠州雷士光电科技有限公司 | LED drive circuit and lighting equipment |
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