CN109947166A - A kind of safe and reliable constant pressure and flow control electric current - Google Patents
A kind of safe and reliable constant pressure and flow control electric current Download PDFInfo
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- CN109947166A CN109947166A CN201711389503.2A CN201711389503A CN109947166A CN 109947166 A CN109947166 A CN 109947166A CN 201711389503 A CN201711389503 A CN 201711389503A CN 109947166 A CN109947166 A CN 109947166A
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Abstract
The invention relates to safe and reliable constant pressure and flow control electric current, the circuit include: applied in power supply technique voltage control loop, applied to the current controlled circuit and photo-coupler in power supply technique；The voltage control loop and current controlled circuit series connection, and an input terminal of the photo-coupler is connect with the voltage output end of the voltage control loop, another input terminal is connect with the voltage output end of the current controlled circuit；One input terminal of the voltage control loop is that the Voltage Feedback in power supply technique samples input terminal, another input terminal is benchmark voltage input end；One input terminal of the current controlled circuit is that the current feedback in power supply technique samples input terminal, another input terminal is benchmark voltage input end.Technical solution provided by the invention can not only make Switching Power Supply and charging unit provide the power supply of constant pressure and constant current, but also can be realized long-range control and energy conservation, improve Supply Security.
Description
Technical field
The present invention relates to a kind of power supply techniques, are applied in power supply technique more particularly to one kind as being applied to Switching Power Supply
And it can be realized external control in charging unit (especially high-power charger and charger etc.) etc. (such as long-range control)
Constant voltage constant current control circuit.
Background technique
Currently, Switching Power Supply control mostly uses negative feedback control technology greatly, i.e., realized on the basis of feedback network split
The control in powered-down source.
Summary of the invention
It is an object of the present invention to overcome defect existing for existing negative feedback control technology, and provide a kind of novel knot
The safe and reliable constant pressure and flow of structure controls electric current, the technical problem to be solved is that, avoiding Switching Power Supply or charging unit
Deng output voltage or output electric current be in runaway condition, to improve Supply Security, be very suitable for practical.
It the purpose of the present invention and solves its technical problem and can be realized so that the following technical solution is employed.According to the present invention
The safe and reliable constant pressure and flow proposed controls electric current, which includes: that the control circuit includes: to be applied to power supply skill
Voltage control loop in art, applied to the current controlled circuit and photo-coupler in power supply technique；The voltage control loop
Road and current controlled circuit series connection, and the voltage output of an input terminal of the photo-coupler and the voltage control loop
End connection, another input terminal are connect with the voltage output end of the current controlled circuit；One of the voltage control loop is defeated
Entering end is that the Voltage Feedback in power supply technique samples input terminal, another input terminal is benchmark voltage input end；The electric current
One input terminal of control loop is that the current feedback in power supply technique samples input terminal, another input terminal is benchmark voltage
Input terminal.
It the purpose of the present invention and solves its technical problem and can also be further achieved by the following technical measures.
Preferably, safe and reliable constant pressure and flow above-mentioned controls electric current, wherein Voltage Feedback sampling input terminal with it is described
The positive input terminal of operational amplifier in voltage control loop connects, the current feedback sampling input terminal and the current control
The negative input end of operational amplifier in loop connects.
Preferably, safe and reliable constant pressure and flow above-mentioned controls electric current, wherein Voltage Feedback sampling input terminal with it is described
The negative input end of operational amplifier in voltage control loop connects, the current feedback sampling input terminal and the current control
The positive input terminal of operational amplifier in loop connects.
Preferably, safe and reliable constant pressure and flow above-mentioned controls electric current, wherein the photo-coupler is phototriode
Type photo-coupler, and the collector of the phototriode in the photo-coupler connects reference voltage, emitter output voltage.
By above-mentioned technical proposal, safe and reliable constant pressure and flow control electric current of the invention at least have following advantages and
The utility model has the advantages that the present invention is by by voltage control loop and current controlled circuit series connection, and by voltage control loop and electric current control
Loop processed is connect with the input terminal of photo-coupler respectively, keeps constant voltage constant current control circuit either different in electric voltage exception or electric current
It can stop power supply in the case where often, not only realize external signal and remotely control, and can be realized and believe without control
Number when complete switch off power supply output, so that power supply is in energy-saving mode (such as control switch main power control chip pulse width modulation PWM
Output, in this way, Switching Power Supply main power circuit reaches zero loss), thus remote enhancing Switching Power Supply and charging unit etc.
On the basis of journey controllability, make Switching Power Supply or charging unit (especially high-power charger or charger) etc. can be right
It is outer that the power supply of constant pressure and flow is provided, it effectively prevents abnormity of power supply and is set to Switching Power Supply or charger or rear class electricity consumption
It is adversely affected caused by standby, improves the voltage stabilization and current stabilization precision of control circuit, and then improve electrical safety, be very suitable for reality
With.
In conclusion the present invention technically has significant progress, and there is apparent good effect, be really a novelty,
Progressive, practical new design.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects, features and advantages of the invention can
It is clearer and more comprehensible, it is special below to lift preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Fig. 1 is that safe and reliable constant pressure and flow of the invention controls current diagram.
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Attached drawing and preferred embodiment, to safe and reliable constant pressure and flow control its specific embodiment of electric current proposed according to the present invention,
Structure, feature and effect, detailed description is as follows.
The safe and reliable constant pressure and flow control electric current of one kind of the specific embodiment of the invention includes: applied in power supply technique
Voltage control loop, applied to the current controlled circuit and photo-coupler in power supply technique.Wherein, voltage control loop and
Current controlled circuit is connected in series, and the voltage output end of an input terminal of photo-coupler and voltage control loop connects, optocoupler
Another input terminal of clutch and the voltage output end of current controlled circuit connect.One input terminal of voltage control loop is power supply
Voltage Feedback in technology samples input terminal, another input terminal is benchmark voltage input end；One of current controlled circuit is defeated
Entering end is that the current feedback in power supply technique samples input terminal, another input terminal is benchmark voltage input end.
The set-up mode of above-mentioned Voltage Feedback sampling input terminal and current feedback sampling input terminal can have the following two kinds:
The first set-up mode: the positive input terminal that Voltage Feedback samples the operational amplifier in input terminal and voltage control loop connects
It connects, the negative input end of the operational amplifier in voltage control loop is connect with reference voltage input；Current feedback sampling input
End connect with the negative input end of the operational amplifier in current controlled circuit, the operational amplifier in current controlled circuit it is just defeated
Enter end to connect with reference voltage input.
Second of set-up mode: Voltage Feedback samples the negative input of the operational amplifier in input terminal and voltage control loop
End connects, and the positive input terminal of the operational amplifier in voltage control loop is connect with reference voltage input；Current feedback sampling
Input terminal is connect with the positive input terminal of the operational amplifier in current controlled circuit, the operational amplifier in current controlled circuit
Negative input end is connect with reference voltage input.
Photo-coupler in the present embodiment includes light-emitting component and light receiving element.Light-emitting component therein can be photoelectricity two
Pole pipe, light receiving element can be phototriode.
In the case where the photo-coupler is phototriode cast photo-coupler, phototriode in the photo-coupler
Base stage is photosensitive, and collector connects reference voltage (i.e. Vref), emitter output supply voltage.
Fig. 1 is a specific implementation circuit diagram of safe and reliable constant pressure and flow control electric current of the invention.
The left side of circuit shown in Fig. 1 is photo-coupler, and right side includes current controlled circuit and voltage control loop.?
The I of the top on right side0(V0+) connection sample rate current (i.e. I0(V0+) be that current feedback samples input terminal), and right side is most lower
The V at end0+(I0) connection sampled voltage (i.e. V0+(I0) be that Voltage Feedback samples input terminal) when, the top half on the right side in Fig. 1
Circuit is current controlled circuit, and the lower half portion on right side is voltage control loop.I in the top on right side0(V0+) connection
Sampled voltage (i.e. I0(V0+) be that Voltage Feedback samples input terminal), and the lowermost V on right side0+(I0) connection sample rate current is (i.e.
V0+(I0) be that current feedback samples input terminal) when, the top half circuit on the right side in Fig. 1 is voltage control loop, and right side
Lower half portion be current controlled circuit.
Control circuit shown in fig. 1 is in I0(V0+) connect sample rate current and V0+(I0) connection sampled voltage in the case where,
Sample rate current is connect with the negative input end (i.e. 6 ends) of upside operational amplifier, and reference voltage (i.e. VREF-2) is put with upside operation
Positive input terminal (the i.e. 5 ends) connection of big device, sampled voltage are connect, benchmark with the positive input terminal (i.e. 3 ends) of downside operational amplifier
Voltage (i.e. VREF-1) is connect with the negative input end (i.e. 2 ends) of downside operational amplifier, at this point, only in upside operational amplifier
Output end (i.e. 7 ends) be high and when the output end (i.e. 1 end) of downside operational amplifier is low, photo-coupler works normally, defeated
Supply voltage out, otherwise, photo-coupler stop working, and export without supply voltage.Believe in any one reference edge no-voltage
In the case where number (i.e. without reference voltage), power supply is i.e. without output.
Control circuit shown in fig. 1 is in I0(V0+) connect sampled voltage and V0+(I0) connection sample rate current in the case where,
Sampled voltage is connect with the negative input end (i.e. 6 ends) of upside operational amplifier, and reference voltage (i.e. VREF-2) is put with upside operation
Positive input terminal (the i.e. 5 ends) connection of big device, sample rate current are connect, benchmark with the positive input terminal (i.e. 3 ends) of downside operational amplifier
Voltage (i.e. VREF-1) is connect with the negative input end (i.e. 2 ends) of downside operational amplifier, at this point, only in upside operational amplifier
Output end (i.e. 7 ends) be low and downside operational amplifier output end (i.e. 1 end) be it is high when, photo-coupler work normally, it is defeated
Supply voltage out, otherwise, photo-coupler stop working, and export without supply voltage.Believe in any one reference edge no-voltage
In the case where number (i.e. without reference voltage), power supply is i.e. without output.
The physical circuit being shown by fig. 1 can be seen that in the case where feedback network disconnects, and photo-coupler will not normal work
Make, to automatically shut power off output；It is normal in feedback network, and to control circuit apply with VREF (reference voltage) the case where
Under, only in the case where constant pressure and flow, photo-coupler can just be worked normally, to provide power supply output.
Specifically, the I in Fig. 10(V0+) connect sample rate current and V0+(I0) connection sampled voltage in the case where, when
Control circuit works in pressure constant state, and voltage control loop therein plays the role of error amplifier, electric current control therein
Loop processed plays the role of voltage comparator, and the operational amplifier in current controlled circuit exports always high level；And in electricity
After source sampling electric current reaches constant current point, control circuit automatically switches to constant current state work, at this point, current controlled circuit plays mistake
The effect of poor amplifier, and voltage control loop plays the role of voltage comparator, and voltage control loop exports always low electricity
It is flat；To which photo-coupler works normally, the base stage of the phototriode in the photo-coupler is photosensitive, and collector connects reference voltage
(i.e. Vref), emitter export certain control voltage, voltage required for control power supply exports.
In addition, being exchanged by voltage and current feedback sample point, i.e. I0 (V0+) connection sampled voltage and V0+ in Fig. 1
(I0) in the case where connecting sample rate current, then the state of voltage and current and foregoing description are on the contrary, but can play same perseverance
Press constant current effect.Specifically, wherein current controlled circuit plays error amplifier when control circuit work is in constant current state
Effect, and voltage control loop plays the role of voltage comparator, and voltage control loop exports always high level；And it is sampling
After voltage reaches constant pressure point, control circuit automatically switches to pressure constant state work, at this point, voltage control loop plays error amplification
The effect of device, current controlled circuit therein play the role of voltage comparator, and the operational amplifier in current controlled circuit
Low level is exported always；To which photo-coupler works normally, the base stage of the phototriode in the photo-coupler is photosensitive, collector
It connects reference voltage (i.e. Vref), emitter exports certain control voltage, voltage required for control power supply exports.
The above is only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member without departing from the scope of the present invention, when the technology contents using the disclosure above make it is a little change or be modified to
The equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, it is right according to the technical essence of the invention
Any simple modification, equivalent change and modification made by above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (4)
1. a kind of safe and reliable constant pressure and flow controls electric current, which is characterized in that the control circuit includes: to be applied to power supply skill
Voltage control loop in art, applied to the current controlled circuit and photo-coupler in power supply technique；
The voltage control loop and current controlled circuit series connection, and an input terminal of the photo-coupler and the voltage
The voltage output end of control loop connects, and another input terminal is connect with the voltage output end of the current controlled circuit；
One input terminal of the voltage control loop is that the Voltage Feedback in power supply technique samples input terminal, another input
End is benchmark voltage input end；
One input terminal of the current controlled circuit is that the current feedback in power supply technique samples input terminal, another input
End is benchmark voltage input end.
2. safe and reliable constant pressure and flow as described in claim 1 controls electric current, which is characterized in that the Voltage Feedback sampling
Input terminal is connect with the positive input terminal of the operational amplifier in the voltage control loop, current feedback sampling input terminal with
The negative input end of operational amplifier in the current controlled circuit connects.
3. safe and reliable constant pressure and flow as described in claim 1 controls electric current, which is characterized in that the Voltage Feedback sampling
Input terminal is connect with the negative input end of the operational amplifier in the voltage control loop, current feedback sampling input terminal with
The positive input terminal of operational amplifier in the current controlled circuit connects.
4. the safe and reliable constant pressure and flow as described in claims 1 or 2 or 3 controls electric current, which is characterized in that the optical coupling
Device is phototriode cast photo-coupler, and the collector of the phototriode in the photo-coupler connects reference voltage, transmitting
Pole output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711389503.2A CN109947166A (en) | 2017-12-21 | 2017-12-21 | A kind of safe and reliable constant pressure and flow control electric current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711389503.2A CN109947166A (en) | 2017-12-21 | 2017-12-21 | A kind of safe and reliable constant pressure and flow control electric current |
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| Publication Number | Publication Date |
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| CN109947166A true CN109947166A (en) | 2019-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711389503.2A Pending CN109947166A (en) | 2017-12-21 | 2017-12-21 | A kind of safe and reliable constant pressure and flow control electric current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110620412A (en) * | 2019-09-25 | 2019-12-27 | 上海类比半导体技术有限公司 | Minimum output selection circuit and battery charge-discharge circuit |
-
2017
- 2017-12-21 CN CN201711389503.2A patent/CN109947166A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110620412A (en) * | 2019-09-25 | 2019-12-27 | 上海类比半导体技术有限公司 | Minimum output selection circuit and battery charge-discharge circuit |
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Application publication date: 20190628 |