CN202383545U - Constant-voltage constant-current control circuit applied to power supply technology - Google Patents
Constant-voltage constant-current control circuit applied to power supply technology Download PDFInfo
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- CN202383545U CN202383545U CN2011203362133U CN201120336213U CN202383545U CN 202383545 U CN202383545 U CN 202383545U CN 2011203362133 U CN2011203362133 U CN 2011203362133U CN 201120336213 U CN201120336213 U CN 201120336213U CN 202383545 U CN202383545 U CN 202383545U
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Abstract
The utility model relates to a constant-voltage constant-current control circuit applied to the power supply technology, which comprises a voltage control loop, a current control loop and an optical coupler, wherein the voltage control loop and the current control loop are applied to the power supply technology and connected in series, one input end of the optical coupler is connected with a voltage output end of the voltage control loop, the other input end of the optical coupler is connected with a voltage output end of the current control loop, one input end of the voltage control loop is a voltage feedback and sampling input end in the power supply technology, the other input end of the voltage control loop is a reference voltage input end in the power supply technology, one input end of the current control loop is a current feedback and sampling input end in the power supply technology, and the other input end of the current control loop is a reference current input end. By the aid of the constant-voltage constant-current control circuit in the technical scheme, a switch power source and a charging device can provide power source constant in voltage and current, remote control and energy economization can be realized, and safety in power supply is improved.
Description
Technical field
The utility model relates to a kind of power supply technique, particularly relates to a kind of being applied in the power supply technique as being applied to the constant pressure and flow control circuit that can realize external control (like Long-distance Control) in Switching Power Supply and the charging device (especially high-power charging set and charger etc.) etc.
Background technology
At present, the negative feedback control technology is adopted in Switching Power Supply control mostly, promptly on the basis of feedback network, realizes the control to Switching Power Supply.
The inventor finds in realizing the utility model process: the negative feedback control technology is under the situation that feedback network breaks off; The output voltage or the output current of Switching Power Supply are in runaway condition, thereby may the back level consumer of Switching Power Supply and Switching Power Supply be caused damage.
Because the defective that above-mentioned existing feedback control technology exists; The inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge; Cooperate the utilization of scientific principle, actively study innovation, in the hope of founding a kind of constant pressure and flow control circuit in the power supply technique that is applied to of new structure; Can overcome the problem that existing feedback control technology exists, make it have more practicality.Through constantly research, design, and, found out the utility model of true tool practical value finally through after studying sample and improvement repeatedly.
Summary of the invention
The purpose of the utility model is; Overcome the defective that existing negative feedback control technology exists; And a kind of constant pressure and flow control circuit in the power supply technique that is applied to of new structure is provided, technical matters to be solved is to avoid the output voltage or the output current of Switching Power Supply or charging device etc. to be in runaway condition; To improve Supply Security, be very suitable for practicality.
The purpose of the utility model and solve its technical matters and can adopt following technical scheme to realize.Be applied to the constant pressure and flow control circuit in the power supply technique according to what the utility model proposed, this control circuit comprises: said control circuit comprises: be applied in the power supply technique the Control of Voltage loop, be applied to current controlled circuit and photo-coupler in the power supply technique; The series connection of said Control of Voltage loop and said current controlled circuit, and an input end of said photo-coupler is connected with the voltage output end of said Control of Voltage loop, and another input end is connected with the voltage output end of said current controlled circuit; An input end of said Control of Voltage loop be in the power supply technique Voltage Feedback sampling input end, another input end is a reference voltage input; An input end of said current controlled circuit be in the power supply technique current feedback sampling input end, another input end is a reference voltage input.
The purpose of the utility model and solve its technical matters and can also adopt following technical measures to come further to realize.
Preferable; The aforesaid constant pressure and flow control circuit that is applied in the power supply technique; Wherein the positive input terminal of the operational amplifier in Voltage Feedback sampling input end and the said Control of Voltage loop is connected, and the sample negative input end of the operational amplifier in input end and the said current controlled circuit of said current feedback is connected.
Preferable; The aforesaid constant pressure and flow control circuit that is applied in the power supply technique; Wherein the negative input end of the operational amplifier in Voltage Feedback sampling input end and the said Control of Voltage loop is connected, and the sample positive input terminal of the operational amplifier in input end and the said current controlled circuit of said current feedback is connected.
Preferable, the aforesaid constant pressure and flow control circuit that is applied in the power supply technique, wherein said photo-coupler are phototriode cast photo-coupler, and the collector of the phototriode in the said photo-coupler connects reference voltage, the emitter output voltage.。
By technique scheme; The constant pressure and flow control circuit that is applied in the power supply technique of the utility model has advantage and beneficial effect at least: the utility model is through connecting Control of Voltage loop and current controlled circuit; And the Control of Voltage loop is connected with the input end of photo-coupler respectively with current controlled circuit; Make no matter the constant pressure and flow control circuit is under the situation of electric voltage exception or current anomaly, can both stop power supply supplying with; Not only realized the external signal Long-distance Control, and complete power cutoff output can be implemented in no control signal the time, making power supply be in energy saver mode (does not have the output of pulsewidth modulation (PWM) like control switching main control chip; Like this; Switching Power Supply master's power circuit reaches zero loss), thus on the basis that has strengthened remote-controllable property such as Switching Power Supply and charging device, make Switching Power Supply or charging device (especially high-power charging set or charger) etc. can externally provide the power supply of constant pressure and flow to supply with; The adverse effect of effectively having avoided abnormity of power supply to cause for Switching Power Supply or charger or back level consumer; Improve the voltage stabilization and current stabilization precision of control circuit, and then improved electrical safety, be very suitable for practicality.
In sum, the utility model has obvious improvement technically, and has tangible good effect, really is the new design of a novelty, progress, practicality.
Above-mentioned explanation only is the general introduction of the utility model technical scheme; In order more to know the technological means of understanding the utility model; And can implement according to the content of instructions, and for let the above-mentioned of the utility model with other purposes, feature and advantage can be more obviously understandable, below special act preferred embodiment; And conjunction with figs., specify as follows.
Description of drawings
Fig. 1 is the constant pressure and flow control circuit synoptic diagram in the power supply technique that is applied to of the utility model.
Embodiment
For further setting forth the utility model is to reach technological means and the effect that predetermined utility model purpose is taked; Below in conjunction with accompanying drawing and preferred embodiment; To its embodiment of constant pressure and flow control circuit, structure, characteristic and the effect in the power supply technique that be applied to that proposes according to the utility model, specify as after.
A kind of constant pressure and flow control circuit that is applied in the power supply technique of the utility model specific embodiment comprises: be applied in the power supply technique the Control of Voltage loop, be applied to current controlled circuit and photo-coupler in the power supply technique.Wherein, Control of Voltage loop and current controlled circuit are connected in series, and an input end of photo-coupler is connected with the voltage output end of Control of Voltage loop, and another input end of photo-coupler is connected with the voltage output end of current controlled circuit.An input end of Control of Voltage loop is the Voltage Feedback sampling input end in the power supply technique, and another input end is a reference voltage input; An input end of current controlled circuit is the current feedback sampling input end in the power supply technique, and another input end is a reference voltage input.
The set-up mode of above-mentioned Voltage Feedback sampling input end and current feedback sampling input end can have following two kinds:
First kind of set-up mode: the positive input terminal of the operational amplifier in Voltage Feedback sampling input end and the Control of Voltage loop is connected, and the negative input end of the operational amplifier in the Control of Voltage loop is connected with reference voltage input; The negative input end of the operational amplifier in current feedback sampling input end and the current controlled circuit is connected, and the positive input terminal of the operational amplifier in the current controlled circuit is connected with reference voltage input.
Second kind of set-up mode: the negative input end of the operational amplifier in Voltage Feedback sampling input end and the Control of Voltage loop is connected, and the positive input terminal of the operational amplifier in the Control of Voltage loop is connected with reference voltage input; The positive input terminal of the operational amplifier in current feedback sampling input end and the current controlled circuit is connected, and the negative input end of the operational amplifier in the current controlled circuit is connected with reference voltage input.
Photo-coupler in the present embodiment comprises light-emitting component and photo detector.Light-emitting component wherein can be photodiode, and photo detector can be phototriode.
At this photo-coupler is under the situation of phototriode cast photo-coupler, the base stage sensitization of the phototriode in this photo-coupler, and collector connects reference voltage (being Vref), emitter output supply voltage.
Fig. 1 is a practical implementation circuit diagram that is applied to the constant pressure and flow control circuit in the power supply technique of the utility model.
The left side of the circuit shown in Fig. 1 is a photo-coupler, and the right side comprises current controlled circuit and Control of Voltage loop.I in the top on right side
0(V
0+) to connect sample rate current (be I
0(V
0+) be current feedback sampling input end), and the V bottom on right side
0+ (I
0) to connect sampled voltage (be V
0+ (I
0) be Voltage Feedback sampling input end) time, the first half circuit on the right side among Fig. 1 is a current controlled circuit, and the latter half on right side is the Control of Voltage loop.I in the top on right side
0(V
0+) to connect sampled voltage (be I
0(V
0+) be Voltage Feedback sampling input end), and the V bottom on right side
0+ (I
0) to connect sample rate current (be V
0+ (I
0) be current feedback sampling input end) time, the first half circuit on the right side among Fig. 1 is the Control of Voltage loop, and the latter half on right side is a current controlled circuit.
Control circuit shown in Fig. 1 is at I
0(V
0+) connection sample rate current and V
0+ (I
0) connect under the situation of sampled voltage, sample rate current is connected with the negative input end (i.e. 6 ends) of upside operational amplifier, and reference voltage (being VREF-2) is connected with the positive input terminal (i.e. 5 ends) of upside operational amplifier; Sampled voltage is connected with the positive input terminal (i.e. 3 ends) of downside operational amplifier, and reference voltage (being VREF-1) is connected with the negative input end (i.e. 2 ends) of downside operational amplifier, at this moment; Be that the output terminal (i.e. 1 end) of height and downside operational amplifier is when low only at the output terminal (i.e. 7 ends) of upside operational amplifier; The photo-coupler operate as normal, output supply voltage, otherwise; Photo-coupler quits work, and does not have supply voltage output.Promptly under the situation of any one reference edge no-voltage signal (promptly not having reference voltage), power supply is a no-output.
Control circuit shown in Fig. 1 is at I
0(V
0+) connection sampled voltage and V
0+ (I
0) connect under the situation of sample rate current, sampled voltage is connected with the negative input end (i.e. 6 ends) of upside operational amplifier, and reference voltage (being VREF-2) is connected with the positive input terminal (i.e. 5 ends) of upside operational amplifier; Sample rate current is connected with the positive input terminal (i.e. 3 ends) of downside operational amplifier, and reference voltage (being VREF-1) is connected with the negative input end (i.e. 2 ends) of downside operational amplifier, at this moment; Only the output terminal (i.e. 7 ends) of upside operational amplifier be low and the output terminal of downside operational amplifier (i.e. 1 end) when high; The photo-coupler operate as normal, output supply voltage, otherwise; Photo-coupler quits work, and does not have supply voltage output.Promptly under the situation of any one reference edge no-voltage signal (promptly not having reference voltage), power supply is a no-output.
Can find out that by the physical circuit shown in Fig. 1 under the situation that feedback network breaks off, photo-coupler can operate as normal, thus powered-down output automatically; Normal at feedback network, and control circuit applied under the situation with VREF (reference voltage), only under the situation of constant pressure and flow, photo-coupler is just understood operate as normal, thereby power supply output is provided.
Specifically, the I in Fig. 1
0(V
0+) connection sample rate current and V
0+ (I
0) connect under the situation of sampled voltage; When control circuit is operated in pressure constant state; Control of Voltage loop wherein plays the effect of error amplifier, and current controlled circuit wherein plays the effect of voltage comparator, and the operational amplifier in the current controlled circuit is exported high level always; And after the power supply sample rate current reaches constant current point; Control circuit automatically switches to constant current state work, and at this moment, current controlled circuit plays the effect of error amplifier; And the Control of Voltage loop plays the effect of voltage comparator, and Control of Voltage loop output low level always; Thereby the photo-coupler operate as normal, the base stage sensitization of the phototriode in this photo-coupler, collector connects reference voltage (being Vref), the control voltage that emitter output is certain, the control power supply is exported needed voltage.
In addition, voltage and current feedback sample point is being exchanged, promptly the I0 among Fig. 1 (V0+) connects under the situation of sampled voltage and V0+ (I0) connection sample rate current, and then the state of voltage and current and foregoing description are opposite, but can play same constant pressure and flow effect.Concrete, when control circuit was operated in constant current state, wherein current controlled circuit played the effect of error amplifier, and the Control of Voltage loop plays the effect of voltage comparator, and the Control of Voltage loop is exported high level always; And after sampled voltage reaches constant pressure point; Control circuit automatically switches to pressure constant state work, and at this moment, the Control of Voltage loop plays the effect of error amplifier; Current controlled circuit wherein plays the effect of voltage comparator, and the output low level always of the operational amplifier in the current controlled circuit; Thereby the photo-coupler operate as normal, the base stage sensitization of the phototriode in this photo-coupler, collector connects reference voltage (being Vref), the control voltage that emitter output is certain, the control power supply is exported needed voltage.
The above only is the preferred embodiment of the utility model; Be not that the utility model is done any pro forma restriction; Though the utility model discloses as above with preferred embodiment; Yet be not in order to limit the utility model; Any professional and technical personnel of being familiar with makes a little change or is modified to the equivalent embodiment of equivalent variations when the technology contents of above-mentioned announcement capable of using in not breaking away from the utility model technical scheme scope, is the content that does not break away from the utility model technical scheme in every case;, all still belong in the scope of the utility model technical scheme any simple modification, equivalent variations and modification that above embodiment did according to the technical spirit of the utility model.
Claims (4)
1. constant pressure and flow control circuit that is applied in the power supply technique is characterized in that said control circuit comprises: be applied in the power supply technique the Control of Voltage loop, be applied to current controlled circuit and photo-coupler in the power supply technique;
The series connection of said Control of Voltage loop and said current controlled circuit, and an input end of said photo-coupler is connected with the voltage output end of said Control of Voltage loop, and another input end is connected with the voltage output end of said current controlled circuit;
An input end of said Control of Voltage loop be in the power supply technique Voltage Feedback sampling input end, another input end is a reference voltage input;
An input end of said current controlled circuit be in the power supply technique current feedback sampling input end, another input end is a reference voltage input.
2. the constant pressure and flow control circuit that is applied in the power supply technique as claimed in claim 1; It is characterized in that; The positive input terminal of the operational amplifier in said Voltage Feedback sampling input end and the said Control of Voltage loop is connected, and the sample negative input end of the operational amplifier in input end and the said current controlled circuit of said current feedback is connected.
3. the constant pressure and flow control circuit that is applied in the power supply technique as claimed in claim 1; It is characterized in that; The negative input end of the operational amplifier in said Voltage Feedback sampling input end and the said Control of Voltage loop is connected, and the sample positive input terminal of the operational amplifier in input end and the said current controlled circuit of said current feedback is connected.
4. like claim 1 or the 2 or 3 described constant pressure and flow control circuits that are applied in the power supply technique; It is characterized in that; Said photo-coupler is a phototriode cast photo-coupler, and the collector of the phototriode in the said photo-coupler connects reference voltage, the emitter output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203362133U CN202383545U (en) | 2011-09-08 | 2011-09-08 | Constant-voltage constant-current control circuit applied to power supply technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203362133U CN202383545U (en) | 2011-09-08 | 2011-09-08 | Constant-voltage constant-current control circuit applied to power supply technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202383545U true CN202383545U (en) | 2012-08-15 |
Family
ID=46632037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203362133U Withdrawn - After Issue CN202383545U (en) | 2011-09-08 | 2011-09-08 | Constant-voltage constant-current control circuit applied to power supply technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202383545U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102999073A (en) * | 2011-09-08 | 2013-03-27 | 洛阳嘉盛电源科技有限公司 | Constant-voltage and constant-current control circuit applied to power supply technology |
| CN105099142A (en) * | 2015-08-26 | 2015-11-25 | 英飞特电子（杭州）股份有限公司 | Switching mode power supply |
-
2011
- 2011-09-08 CN CN2011203362133U patent/CN202383545U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102999073A (en) * | 2011-09-08 | 2013-03-27 | 洛阳嘉盛电源科技有限公司 | Constant-voltage and constant-current control circuit applied to power supply technology |
| CN102999073B (en) * | 2011-09-08 | 2015-04-22 | 洛阳嘉盛电源科技有限公司 | Constant-voltage and constant-current control circuit applied to power supply technology |
| CN105099142A (en) * | 2015-08-26 | 2015-11-25 | 英飞特电子（杭州）股份有限公司 | Switching mode power supply |
| CN105099142B (en) * | 2015-08-26 | 2017-10-03 | 英飞特电子（杭州）股份有限公司 | A kind of Switching Power Supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120815 Effective date of abandoning: 20150422 |