CN206533284U - Auto-excitation type push-pull type change-over circuit - Google Patents
Auto-excitation type push-pull type change-over circuit Download PDFInfo
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- CN206533284U CN206533284U CN201720237693.5U CN201720237693U CN206533284U CN 206533284 U CN206533284 U CN 206533284U CN 201720237693 U CN201720237693 U CN 201720237693U CN 206533284 U CN206533284 U CN 206533284U
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Abstract
A kind of auto-excitation type push-pull type change-over circuit, include a push-pull type circuit unit, a first resistor device and a second resistance device, the push-pull type circuit unit includes a first transistor and a second transistor, there is input impedance respectively between the first transistor and the control end and earth terminal of the second transistor, the first resistor device is parallel to the input impedance of the first transistor, and the second resistance device is parallel to the input impedance of the second transistor；Pass through foregoing carried parallel circuit architecture, the equivalent inpnt total impedance of the first transistor and the second transistor can be caused by Ohm's law evidence to be reduced, and then clear and definite operating point can be built on so that the first transistor can be quick in saturation region and cut-off region transition with the second transistor.
Description
Technical field
The utility model is, on a kind of DC-DC converting circuit, to particularly relate to the conversion of modified form auto-excitation type push-pull type
Circuit.
Background technology
Existing auto-excitation type push-pull type change-over circuit (Self-Oscillating Push-Pull Converter) is for example
There are typical Royer circuits or typical case's Jensen circuits, mainly include two transistor and a transformer.The two transistor can be respectively
Bipolarity junction transistor (Bipolar Junction Transistor, BJT), the base stage of the two transistor is respectively by this
Two assists windings among transformer and be electrically connected with an input, the collector of the two transistor connects the primary respectively
Side winding.It should be noted that, even if the two transistor model is identical, but the two transistor electrical characteristic is still not identical；
Thus often in the difference present in transistor, transistor is often resulted in into different operating area.
Existing auto-excitation type push-pull type change-over circuit operates in a self-excited oscillation circuit for motion mechanism, and the auto-excitation type is recommended
Type circuit operation principle is the common knowledge in this origination techniques field, in short, in a starting stage, it is defeated that the input provides one
Enter power supply, the input power provides a startup electric energy using a start-up circuit framework and gives the two transistor, because the two transistor
Electrical characteristic it is not identical, therefore any transistor between the two transistor is because of the relation of electrical characteristic, can be first from initial
State is easier to enter saturation region, and another transistor is then forced to enter cut-off region from original state.Continue, according to the transformer
Hysteresis curve characteristic in magnet assembly itself, passes through Gauss law evidence so that original place is in saturation region transistor by iron core pole
Sex reversal, it is cut-off region to cause transition, and allows original place to be saturation region in the transistor transition of cut-off region, and the rest may be inferred, two crystalline substance
Ti Guan access switchs area, i.e., alternatively enter saturation region or cut-off region respectively；Its access switch area may be such that transistor is produced and open
Pass is acted, thus reaches auto-excitation type frequency of oscillation.
For existing auto-excitation type push-pull type change-over circuit, allow any transistor whether can be quick by design of transformer
Operating point is set up out with access switch area, can be used as and assess one of known auto-excitation type push-pull type change-over circuit reference, if described turn
The state time is shorter and clearer and more definite, then make it that electrical action characteristic and efficiency are better.
In order to shorten the transition time of the transistor, the existing practice can lift the startup electric energy, need to be by designing compared with Gao Qi
Electrokinetic energy can set up correct operation point by transistor so that it can be rapidly introduced into switch region (i.e.：Saturation region or cut-off region)
And non-entry active region, but on existing two transistor and passive component the opering characteristic of electric apparatus difference, its transistor operationg region falls
More locate in the friendship of active region and saturation region or cut-off region, so that can be variant in electrical action characteristic；However, it is poor to improve this
It is different to strengthen transistor driving ability, to allow it not fall in faintly band active region, but as the startup electric energy strengthens, but also
With increase circuit normality electric energy loss, relative reduction power supply conversion efficiency.
Utility model content
The utility model main purpose makes transistor fall within correct effect to provide a kind of auto-excitation type push-pull type change-over circuit
In area and saturation region is rapidly entered, and the power supply conversion efficiency of certain level can be maintained.
The utility model auto-excitation type push-pull type change-over circuit is included：
One push-pull type circuit unit, comprising：
One input；
One the first transistor, with a power end, an earth terminal and a control end；
One second transistor, with a power end, an earth terminal and a control end；And
One transformer, comprising：
One primary side, comprising one first winding and one second winding, first winding be connected to the input with this first
Between the power end of transistor, second winding is connected between the input and the power end of the second transistor；And
One secondary side, comprising respectively to should the first winding and one first assists winding of second winding and one second it is auxiliary
Winding is helped, first assists winding is connected between the input and the control end of the first transistor, second assists winding
It is connected between the input and the control end of the second transistor；
One first resistor device, is connected between the control end of the first transistor and earth terminal；And
One second resistance device, is connected between the control end of the second transistor and earth terminal.
Wherein, first assists winding connects second assists winding, and first assists winding and second auxiliary around
The connecting node of group connects the input by a startup circuit.
Wherein, first winding connects second winding, and first winding is connected this with the connecting node of second winding
Input.
Wherein, the first resistor device and the resistance value of the second resistance device are more than 1k ohm and 510k ohm following.
Wherein, the first transistor and the second transistor are bipolarity junction transistor, and the power end is collector terminal,
The earth terminal is emitter-base bandgap grading end, and the control end is base terminal.
According to auto-excitation type push-pull type change-over circuit of the present utility model, the control of the first transistor and the second transistor
There is input impedance respectively between end and earth terminal, and the first resistor device is parallel to the input impedance of the first transistor, and
The second resistance device is parallel to the input impedance of the second transistor.Consequently, it is possible to which by foregoing parallel circuit architecture, this first
The input total impedance reduction of the transistor AND gate second transistor, and then shorten the first transistor and the second transistor and enter full
With the transition time in area；Furthermore, compared to the prior art, the utility model is by the first resistor device and the second resistance device
Design configurations, change existing auto-excitation type push-pull type change-over circuit framework, thus the utility model be not required to enhancing startup power supply can be just
Set up really and quickly operating point, can reach shorten transition time and do not cause transistor enter fuzzy workspace into
Effect, and the utility model will not make it that characteristic produces difference and increase circuit normality electric energy loss on circuit operation, it is ensured that
The electrical characteristic and power supply conversion efficiency of the utility model auto-excitation type push-pull type change-over circuit.
Brief description of the drawings
Fig. 1 is the embodiment circuit diagram of the utility model auto-excitation type push-pull type change-over circuit.
Fig. 2 is the circuit diagram of the push-pull type circuit unit of the utility model auto-excitation type push-pull type change-over circuit.
The first transistor input impedance and first resistor device of the Fig. 3 for the utility model auto-excitation type push-pull type change-over circuit are simultaneously
The connection diagram of connection.
Fig. 4 hinders for the equivalent inpnt of the first transistor small-signal model of the utility model auto-excitation type push-pull type change-over circuit
The anti-connection diagram with first resistor device.
Wherein, reference：
The output end of 100 input 101
The winding of 11 primary side 111 first
The primary side of 112 second winding 12
The assists winding of 13 secondary side 131 first
The output circuit of 132 second assists winding 20
30 start circuit
Q1The first transistor Q2Second transistor
R1First resistor device R2Second resistance device
T transformers VinInput voltage
VoutOutput voltage
Embodiment
Fig. 1 and Fig. 2 are refer to, the utility model auto-excitation type push-pull type change-over circuit includes a push-pull type circuit unit, one
First resistor device R1With a second resistance device R2.The push-pull type circuit unit can be typical auto-excitation type push-pull type circuit, such as typical
Royer circuits or typical case's Jensen circuits.In the utility model embodiment, the push-pull type circuit unit includes an input
100th, a first transistor Q1, a second transistor Q2With a transformer T.
The first transistor Q1With second transistor Q2Can be three ports for control component, respectively comprising a power end, an earth terminal
With a control end, in the utility model embodiment, the first transistor Q1With second transistor Q1It can be respectively bipolarity junction
Transistor (Bipolar Junction Transistor, BJT), but be not limited, the power end is collector terminal
(Collector, C), the earth terminal is emitter-base bandgap grading end (Emitter, E), and the control end is base terminal (Base, B).Need explanation
Even if, the first transistor Q1With second transistor Q2Model is identical, the first transistor Q1With second transistor Q2
Quality it is still not identical with characteristic.
Transformer T includes a primary side 11, a primary side 12 and a secondary side 13.
The primary side 11 includes one first winding 111 and one second winding 112, and first winding 111 is connected to the input
End 100 and the first transistor Q1Power end (collector terminal) between, second winding 112 be connected to the input 100 with should
Second transistor Q2Power end (collector terminal) between, as shown in Fig. 2 first winding 111 connect second winding 112, and
First winding 111 is connected the input 100 with the connecting node of second winding 112.
The winding of the primary side 12 is for one output circuit 20 of connection, 20 couple of one out-put supply V of the output circuitoutCarry out whole
Stream is with after filtering, output voltage V is externally provided by an output end 101outTo a load.
The secondary side 13 includes one first assists winding 131 and one second assists winding 132, first assists winding 131
To should the first winding 111, and according to first winding 111 produce one first induced voltage, the correspondence of the second assists winding 132
Second winding 112, and the polarity of one second induced voltage, wherein first induced voltage is produced according to second winding 112
With the opposite polarity of second induced voltage.First assists winding 131 is connected to the input 100 and the first transistor Q1
Control end (base terminal) between, second assists winding 132 is connected to the input 100 and second transistor Q2Control
Between end (base terminal).As shown in Fig. 2 first assists winding 131 connects second assists winding 132, and first auxiliary
Winding 131 starts circuit 30 by one with the connecting node of second assists winding 132 and is connected the input 100.
First resistor device R1It is connected to the first transistor Q1Control end (base terminal) and earth terminal (emitter-base bandgap grading end) it
Between；Second resistance device R2It is connected to second transistor Q2Control end (base terminal) and earth terminal (emitter-base bandgap grading end) between.Its
In, first resistor device R1With second resistance device R2Resistance value can for more than 1k ohm (Ω) and 510k ohm (Ω) below.
The push-pull type circuit unit of the present utility model operates in an auto-excitation type motion mechanism, auto-excitation type push-pull type work
Principle is the common knowledge in this origination techniques field, in short, in a starting stage, the input 100 provides an input voltage
Vin, input voltage VinThe first transistor Q is supplied to by the startup circuit 301With second transistor Q2, because should
The first transistor Q1With second transistor Q2Electrical characteristic is not identical, therefore one transistor can be easier to first from initial shape
State enters saturation region, and another transistor is then forced into cut-off region from original state.For example, it is by the first transistor Q1
Into saturation region, second transistor Q2Then enter cut-off region.Continue, according to transformer T hysteresis curve characteristics itself, allow this
The first transistor Q1Be converted to from saturation region and enter cut-off region, and allow second transistor Q2Be converted to from cut-off region and enter saturation
Area, the rest may be inferred, the first transistor Q1With second transistor Q2Saturation region or cut-off region are alternatively entered respectively, reach this
Auto-excitation type frequency of oscillation motion mechanism.
Below with the first transistor Q1With first resistor device R1Exemplified by.Refer to Fig. 3 and Fig. 4, wherein Fig. 4 for this
One transistor Q1Small-signal model, the first transistor Q1There is an input impedance r between base terminal B and emitter-base bandgap grading end EB, this
Utility model is by first resistor device R1Setting, first resistor device R1Connect the first transistor Q1Base terminal B with penetrating
Between extreme E, make first resistor device R1With input impedance rBForm in parallel.
Consequently, it is possible to first resistor device R1With the first transistor Q1Input impedance rBEquivalent inpnt after parallel connection is total
Impedance ZinLess than the first transistor Q1Input impedance rB, therefore the first transistor Q can be reduced1Equivalent inpnt total impedance
Zin, second transistor Q2Can the rest may be inferred, that is, second transistor Q2Pass through second resistance device R2Setting and reduce
Equivalent inpnt total impedance.No matter the utility model is in normal temperature working environment or extreme operating environments (such as minus 40 degree of celsius),
The first transistor Q1With second transistor Q2Equivalent inpnt total impedance reduction and can correctly set up operating point, therefore
Even if not lifting startup electric energy, it can also shorten the first transistor Q1With second transistor Q2Into the transition time of saturation region,
Also ensure that the utility model auto-excitation type push-pull type change-over circuit electrical characteristic and power supply conversion efficiency simultaneously.
Certainly, the utility model can also have other various embodiments, spiritual and its essence without departing substantially from the utility model
In the case of, those skilled in the art can make various corresponding changes and deformation, but these phases according to the utility model
The change and deformation answered should all belong to the utility model scope of the claims.
Claims (4)
1. a kind of auto-excitation type push-pull type change-over circuit, it is characterised in that include：
One push-pull type circuit unit, comprising：
One input；
One the first transistor, with a power end, an earth terminal and a control end；
One second transistor, with a power end, an earth terminal and a control end；And
One transformer, comprising：
One primary side, comprising one first winding and one second winding, first winding is connected to the input and the first crystal
Between the power end of pipe, second winding is connected between the input and the power end of the second transistor；And
One secondary side, comprising respectively to should the first winding and second winding one first assists winding and one second auxiliary around
Group, first assists winding is connected between the input and the control end of the first transistor, second assists winding connection
Between the input and the control end of the second transistor；
One first resistor device, is connected between the control end of the first transistor and earth terminal；And
One second resistance device, is connected between the control end of the second transistor and earth terminal.
2. auto-excitation type push-pull type change-over circuit according to claim 1, it is characterised in that first assists winding connection should
Second assists winding, and the connecting node of first assists winding and second assists winding is connected this by a startup circuit
Input.
3. auto-excitation type push-pull type change-over circuit according to claim 2, it is characterised in that first winding connect this second
Winding, first winding is connected the input with the connecting node of second winding.
4. auto-excitation type push-pull type change-over circuit according to any one of claim 1 to 3, it is characterised in that first crystalline substance
Body pipe is bipolarity junction transistor with the second transistor, and the power end is collector terminal, and the earth terminal is emitter-base bandgap grading end, institute
Control end is stated for base terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720237693.5U CN206533284U (en) | 2017-03-13 | 2017-03-13 | Auto-excitation type push-pull type change-over circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720237693.5U CN206533284U (en) | 2017-03-13 | 2017-03-13 | Auto-excitation type push-pull type change-over circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206533284U true CN206533284U (en) | 2017-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720237693.5U Active CN206533284U (en) | 2017-03-13 | 2017-03-13 | Auto-excitation type push-pull type change-over circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574416A (en) * | 2017-03-13 | 2018-09-25 | 捷拓科技股份有限公司 | Auto-excitation type push-pull type conversion circuit |
-
2017
- 2017-03-13 CN CN201720237693.5U patent/CN206533284U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574416A (en) * | 2017-03-13 | 2018-09-25 | 捷拓科技股份有限公司 | Auto-excitation type push-pull type conversion circuit |
| CN108574416B (en) * | 2017-03-13 | 2020-10-30 | 捷拓科技股份有限公司 | Self-excited push-pull type conversion circuit |
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