CN205901600U - Arrival current is adjustable, push -pull circuit of output constant current - Google Patents
Arrival current is adjustable, push -pull circuit of output constant current Download PDFInfo
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- CN205901600U CN205901600U CN201620848079.8U CN201620848079U CN205901600U CN 205901600 U CN205901600 U CN 205901600U CN 201620848079 U CN201620848079 U CN 201620848079U CN 205901600 U CN205901600 U CN 205901600U
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- transformator
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Abstract
Arrival current is adjustable, push -pull circuit of output constant current includes: the input has positive voltage input terminal + vin, ground terminal GND, is connected with the voltage stabilizing element between positive voltage input terminal + vin, the ground terminal GND, the output has positive voltage output terminal + out, ground terminal OV, also is connected with the voltage stabilizing element between positive voltage input terminal + out, the ground terminal OV, main transformer, including transformer T1 and transformer T2, transformer T1 and transformer T2's is elementary parallelly connected, transformer T1's elementary center tap is connected to positive voltage input terminal + vin, transformer T1's secondary and output are connected, the first transistor Q1 and second transistor Q2's base is connected respectively at transformer T2's secondary both ends, the first transistor Q1 and second transistor Q2's emitter ground, transformer T1's elementary both ends are connected respectively to the first transistor Q1 and second transistor Q2's collecting electrode, transformer T2's secondary center tap is connected to ground terminal GND.
Description
Technical field
This utility model is related to that a kind of input current is adjustable, output constant current push-pull circuit.
Background technology
Push-pull circuit is the output circuit that two opposed polarity transistors connect, and is managed using two parameter identical power bjt
Or mosfet pipe, it is present in circuit with push pull mode, the waveform of each responsible positive-negative half-cycle amplifies task.Push-pull circuit has right
Claim characteristic, its drive signal is symmetrical expression, two master power switch pipe alternations, passed to load by transformator alternative expression
Delivery of energy amount, magnetic core is operated in first and third quadrant, effectively can reduce volume of transformer, thus reducing Switching Power Supply volume.
Because the characteristic of its Transformer Winding alternation is so that it is provided with more answering in micropower open loop type Switching Power Supply
With.
Royer circuit is also a kind of simple push-pull circuit, and its basic functional principle is to be realized certainly using magnetic saturation characteristic
Impulse and swing, realize two triode alternative expression work, realize the effect of energy transmission.But royer circuit can only realize level pressure
Input, level pressure output, and export with the change of input and change, in precision instrumentation and need milliampere level current control
Occasion under increasingly do not adapt to, therefore need one kind can fluctuate in milliampere level input current and ensure that milliampere level constant current
The modular power source of output.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided a kind of input current is adjustable, output permanent
The push-pull circuit of stream, can apply to the circuit that Intelligent Passive transmitter, precision instrumentation etc. need precision current to control.
To achieve these goals, this utility model employs following technical scheme.
Input current is adjustable, the push-pull circuit of output constant current, comprising:
Input, has positive voltage input terminal+vin, ground terminal gnd, positive voltage input terminal+vin, ground terminal
It is connected with voltage stabilizing element between gnd；
Outfan, has positive voltage output end+out, ground terminal ov, positive voltage input terminal+out, ground terminal
Also it is connected with voltage stabilizing element between ov；
Main transformer, is connected across between input and outfan, including transformator t1 and transformator t2, transformator t1 and change
The primary parallel of depressor t2, the primary center tap of transformator t1 connects to positive voltage input terminal+vin, and transformator t1's is secondary
Level is connected with outfan, and the secondary two ends of transformator t2 connect the first transistor q1 and the base stage of transistor seconds q2 respectively, the
The grounded emitter of one transistor q1 and transistor seconds q2, the colelctor electrode of the first transistor q1 and transistor seconds q2 connects respectively
Connect the primary two ends of transformator t1, the secondary centre tap of transformator t2 connects to ground terminal gnd.
Compared with prior art, the beneficial effects of the utility model are as follows:
Can effectively solve in the case that input voltage is specified it is ensured that input current can be beated between 2～20ma
During change, output can be with constant-current voltage-stabilizing output it is achieved that milliampere level input current ensure that milliampere level constant current output when fluctuating
Milliwatt module power supply circuit, can be applicable to the occasion of high-precision current requirement, expands application scenario and the model of push-pull circuit
Enclose, circuit structure is simple, open circuit loss is little, stable performance.
Brief description
Fig. 1 is circuit theory diagrams of the present utility model.
Specific embodiment
As shown in figure 1, input current is adjustable, output constant current push-pull circuit, comprising:
Input, has positive voltage input terminal+vin, ground terminal gnd, positive voltage input terminal+vin, ground terminal
It is connected with voltage stabilizing element between gnd；
Outfan, has positive voltage output end+out, ground terminal ov, positive voltage input terminal+out, ground terminal
Also it is connected with voltage stabilizing element between ov；
Main transformer, is connected across between input and outfan, including transformator t1 and transformator t2, transformator t1 and change
The primary parallel of depressor t2, the primary center tap of transformator t1 connects to positive voltage input terminal+vin, and transformator t1's is secondary
Level is connected with outfan, and the secondary two ends of transformator t2 connect the first transistor q1 and the base stage of transistor seconds q2 respectively, the
The grounded emitter of one transistor q1 and transistor seconds q2, the colelctor electrode of the first transistor q1 and transistor seconds q2 connects respectively
Connect the primary two ends of transformator t1, the secondary centre tap of transformator t2 connects to ground terminal gnd.Wherein, transformator t1 bears
Duty control first crystal close q1 and transistor seconds q2 interactive open and close, its operation principle compared with push-pull circuit (royer
Circuit), transformator t2 is responsible for the conversion of voltage.
Preferably, the voltage stabilizing element connecting between positive voltage input terminal+vin, ground terminal gnd is voltage stabilizing two in parallel
Pole pipe d1 and Zener diode d2.Zener diode d1 and Zener diode d2 be responsible for input current change when stationary flow to rear class
Voltage.
Preferably, the voltage stabilizing element connecting between positive voltage input terminal+out, ground terminal ov is voltage stabilizing two in parallel
Pole pipe d4 and Zener diode d5.Zener diode d4 and Zener diode d5 is used for guaranteeing stablizing of output voltage.
Preferably, the secondary centre tap of transformator t2 is connected to ground terminal gnd by electric capacity c2.
Preferably, the secondary two ends of transformator t1 are connected with positive voltage input terminal+out by rectification unit d3.
Circuit structure of the present utility model has done two improvement in open loop type push-pull circuit, and one is that main transformer is divided into change
Depressor t1 and transformator t2, two is to increase voltage stabilizing element respectively in input, outfan.Wherein, transformator t1 is responsible for controlling
One crystal close q1 and transistor seconds q2 interactive open and close, its operation principle compared with push-pull circuit (royer circuit), change
Depressor t2 is responsible for the conversion of voltage, and it is to the voltage of rear class, defeated that the voltage stabilizing element of input is responsible for stationary flow during input current change
The voltage stabilizing element going out end is for guaranteeing stablizing of output voltage.
For a person skilled in the art, can structure according to disclosed in this utility model and principle obtain other each
Kind corresponding change and deform, and all these changes and deformation broadly falls into protection category of the present utility model.
Claims (5)
1. input current is adjustable, output constant current push-pull circuit is it is characterised in that include:
Input, has positive voltage input terminal+vin, ground terminal gnd, positive voltage input terminal+vin, ground terminal gnd
Between be connected with voltage stabilizing element；
Outfan, has positive voltage output end+out, ground terminal ov, positive voltage input terminal+out, ground terminal ov it
Between be also connected with voltage stabilizing element；
Main transformer, is connected across between input and outfan, including transformator t1 and transformator t2, transformator t1 and transformator
The primary parallel of t2, the primary center tap of transformator t1 connects to positive voltage input terminal+vin, the secondary of transformator t1 with
Outfan connects, and the secondary two ends of transformator t2 connect the first transistor q1 and the base stage of transistor seconds q2 respectively, and first is brilliant
The grounded emitter of body pipe q1 and transistor seconds q2, the colelctor electrode of the first transistor q1 and transistor seconds q2 connects change respectively
The primary two ends of depressor t1, the secondary centre tap of transformator t2 connects to ground terminal gnd.
2. input current according to claim 1 is adjustable, output constant current push-pull circuit it is characterised in that: positive voltage is defeated
Entering the voltage stabilizing element connecting between terminal+vin, ground terminal gnd is Zener diode d1 in parallel and Zener diode d2.
3. input current according to claim 1 is adjustable, output constant current push-pull circuit it is characterised in that: positive voltage is defeated
Entering the voltage stabilizing element connecting between terminal+out, ground terminal ov is Zener diode d4 in parallel and Zener diode d5.
4. input current according to claim 1 is adjustable, output constant current push-pull circuit it is characterised in that: transformator t2
Secondary centre tap connected to ground terminal gnd by electric capacity c2.
5. input current according to claim 1 is adjustable, output constant current push-pull circuit it is characterised in that: transformator t1
Secondary two ends be connected with positive voltage input terminal+out by rectification unit d3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620848079.8U CN205901600U (en) | 2016-08-05 | 2016-08-05 | Arrival current is adjustable, push -pull circuit of output constant current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620848079.8U CN205901600U (en) | 2016-08-05 | 2016-08-05 | Arrival current is adjustable, push -pull circuit of output constant current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205901600U true CN205901600U (en) | 2017-01-18 |
Family
ID=57783167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620848079.8U Expired - Fee Related CN205901600U (en) | 2016-08-05 | 2016-08-05 | Arrival current is adjustable, push -pull circuit of output constant current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205901600U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112366955A (en) * | 2020-10-30 | 2021-02-12 | 上海空间电源研究所 | Constant current control circuit and method based on push-pull circuit |
-
2016
- 2016-08-05 CN CN201620848079.8U patent/CN205901600U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112366955A (en) * | 2020-10-30 | 2021-02-12 | 上海空间电源研究所 | Constant current control circuit and method based on push-pull circuit |
| CN112366955B (en) * | 2020-10-30 | 2022-04-08 | 上海空间电源研究所 | Constant current control circuit and method based on push-pull circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170118 Termination date: 20210805 |