CN102999073A - Constant-voltage and constant-current control circuit applied to power supply technology - Google Patents

Constant-voltage and constant-current control circuit applied to power supply technology Download PDF

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Publication number
CN102999073A
CN102999073A CN2011102653329A CN201110265332A CN102999073A CN 102999073 A CN102999073 A CN 102999073A CN 2011102653329 A CN2011102653329 A CN 2011102653329A CN 201110265332 A CN201110265332 A CN 201110265332A CN 102999073 A CN102999073 A CN 102999073A
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voltage
input
power supply
constant
current
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CN2011102653329A
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CN102999073B (en
Inventor
张家书
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Luoyang Jiasheng New Energy Technology Co., Ltd.
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LUOYANG GRASEN POWER TECHNOLOGY Co Ltd
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Abstract

The invention relates to a constant-voltage and constant-current control circuit applied to the power supply technology. The constant-voltage and constant-current control circuit comprises a voltage control loop applied to the power supply technology, a current control loop applied to the power supply technology and an optical coupler. The voltage control loop and the current control loop are serially connected, an input end of the optical coupler is connected with a voltage output end of the voltage control loop, and the other input end of the optical coupler is connected with a voltage output end of the current control loop; an input end of the voltage control loop serves as a voltage feedback sampling input end in the power supply technology, and the other input end of the voltage control loop serves as a reference voltage input end; and an input end of the current control loop serves as a current feedback sampling input end in the power supply technology, and the other input end of the current control loop serves as a reference voltage input end. By means of the technical scheme, a switch power source and a charging device can provide constant-voltage and constant-current power source, remote control and energy conservation can be achieved, and the constant-voltage and constant-current control circuit improves power utilization safety and is very practical.

Description

Be applied to the constant pressure and flow control circuit in the power supply technique
Technical field
The present invention relates to a kind of power supply technique, particularly relate 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 (such as Long-distance Control) in Switching Power Supply and the charging device (especially high-power charger and charger etc.) etc.
Background technology
At present, the negative feedback control technology is adopted in Switching Power Supply control mostly, namely realizes the control to Switching Power Supply on the basis of feedback network.
The inventor finds in realizing process of the present invention: the negative feedback control technology is in the situation that feedback network disconnects, output voltage or the output current of Switching Power Supply are in runaway condition, thereby may the rear class 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 for many years abundant practical experience and professional knowledge of this type of product design manufacturing, cooperate the utilization of scientific principle, positive research and innovation in addition, in the hope of founding a kind of constant pressure and flow control circuit in the power supply technique of being 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 through after repeatedly studying sample and improvement, finally create the present invention who has practical value.
Summary of the invention
The object of the invention is to, overcome the defective that existing negative feedback control technology exists, and provide a kind of constant pressure and flow control circuit in the power supply technique of being applied to of new structure, technical matters to be solved is, avoid 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.
Purpose of the present invention and solve its technical matters and can adopt following technical scheme to realize.
Be applied to constant pressure and flow control circuit in the power supply technique according to what the present invention proposed, this control circuit comprises: described 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 described Control of Voltage loop and described current controlled circuit, and an input end of described photo-coupler is connected with the voltage output end of described Control of Voltage loop, and another input end is connected with the voltage output end of described current controlled circuit; An input end of described Control of Voltage loop be in the power supply technique Voltage Feedback sampling input end, another input end is reference voltage input; An input end of described current controlled circuit be in the power supply technique current feedback sampling input end, another input end is reference voltage input.
Purpose of the present invention and solve its technical matters and can also be further achieved by the following technical measures.
Better, 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 described Control of Voltage loop is connected, and the sample negative input end of the operational amplifier in input end and the described current controlled circuit of described current feedback is connected.
Better, 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 described Control of Voltage loop is connected, and the sample positive input terminal of the operational amplifier in input end and the described current controlled circuit of described current feedback is connected.
Better, 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 described 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 present invention has following advantages and beneficial effect at least: the present invention is by connecting Control of Voltage loop and current controlled circuit; and Control of Voltage loop and current controlled circuit be connected with the input end of photo-coupler respectively; make no matter the constant pressure and flow control circuit is can both stop power supply supplying with in the situation of electric voltage exception or current anomaly; not only realized the external signal Long-distance Control; and complete power cutoff output can be implemented in without control signal the time; making power supply be in energy saver mode (exports without the pulsewidth modulation (PWM) such as the gauge tap main power control chip; like this; the Switching Power Supply main power circuit reaches zero loss); thereby on the basis that has strengthened the long-range controllabilitys such as Switching Power Supply and charging device; make Switching Power Supply or charging device (especially high-power charger 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 to Switching Power Supply or charger or rear class consumer; improved the voltage stabilization and current stabilization precision of control circuit; and then the present invention improved electrical safety, is very suitable for practicality.
In sum, the present invention has significant progress technically, and has significantly positive technique effect, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, and for above and other purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and the cooperation accompanying drawing, be described in detail as follows.
Description of drawings
Fig. 1 is the constant pressure and flow control circuit synoptic diagram that is applied in the power supply technique of the present invention.
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, be applied to its embodiment of constant pressure and flow control circuit, structure, feature and effect in the power supply technique to what foundation the present invention proposed, be described in detail as follows.
A kind of constant pressure and flow control circuit that is applied in the power supply technique of the specific embodiment of the invention 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 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 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:
The first 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.
The second 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.
Be in the situation of phototriode cast photo-coupler at this photo-coupler, the base stage sensitization of the phototriode in this photo-coupler, collector connects reference voltage (being Vref), emitter output supply voltage.
Fig. 1 is an implementation circuit diagram that is applied to the constant pressure and flow control circuit in the power supply technique of the present invention.
The left side of the circuit shown in Fig. 1 is 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 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 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 in the situation of sampled voltage, sample rate current is connected with the negative input end (i.e. 6 ends) of upside operational amplifier, 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, 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 at the output terminal (i.e. 7 ends) of upside operational amplifier only, the photo-coupler normal operation, output supply voltage, otherwise, photo-coupler quits work, and does not have supply voltage output.Namely in the situation of any one reference edge no-voltage signal (namely without reference voltage), power supply is no-output.
Control circuit shown in Fig. 1 is at I 0(V 0+) connection sampled voltage and V 0+ (I 0) connect in the situation of sample rate current, sampled voltage is connected with the negative input end (i.e. 6 ends) of upside operational amplifier, 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, 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 normal operation, output supply voltage, otherwise, photo-coupler quits work, and does not have supply voltage output.Namely in the situation of any one reference edge no-voltage signal (namely without reference voltage), power supply is no-output.
Can be found out that by the physical circuit shown in Fig. 1 in the situation that feedback network disconnects, photo-coupler can not work, thus the output of autoshutdown power supply; Normal at feedback network, and control circuit applied in the situation with VREF (reference voltage), only in the situation of constant pressure and flow, photo-coupler just can work, 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 in 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 normal operation, 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, be that I0 (V0+) among Fig. 1 connects sampled voltage and V0+ (I0) connects in the situation of sample rate current, then the state of voltage and current is opposite with foregoing description, 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 normal operation, 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 preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not in order to concrete restriction the present invention, any those skilled in the art are not within breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.

Claims (4)

1. constant pressure and flow control circuit that is applied in the power supply technique is characterized in that described 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 described Control of Voltage loop and described current controlled circuit, and an input end of described photo-coupler is connected with the voltage output end of described Control of Voltage loop, and another input end is connected with the voltage output end of described current controlled circuit;
An input end of described Control of Voltage loop be in the power supply technique Voltage Feedback sampling input end, another input end is reference voltage input;
An input end of described current controlled circuit be in the power supply technique current feedback sampling input end, another input end is 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 described Voltage Feedback sampling input end and the described Control of Voltage loop is connected, and the sample negative input end of the operational amplifier in input end and the described current controlled circuit of described 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 described Voltage Feedback sampling input end and the described Control of Voltage loop is connected, and the sample positive input terminal of the operational amplifier in input end and the described current controlled circuit of described current feedback is connected.
4. such as 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, described photo-coupler is phototriode cast photo-coupler, and the collector of the phototriode in the described photo-coupler connects reference voltage, the emitter output voltage.
CN201110265332.9A 2011-09-08 2011-09-08 Constant-voltage and constant-current control circuit applied to power supply technology Active CN102999073B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105305850A (en) * 2015-11-13 2016-02-03 苏州扬佛自动化设备有限公司 Voltage reduction control circuit of switching power supply
CN105305851A (en) * 2015-11-13 2016-02-03 苏州扬佛自动化设备有限公司 Voltage reduction control method of switching power supply
CN105337351A (en) * 2015-10-30 2016-02-17 苏州扬佛自动化设备有限公司 Charger control circuit
CN105334755A (en) * 2015-10-30 2016-02-17 苏州扬佛自动化设备有限公司 Electric vehicle power source control circuit
CN105914832A (en) * 2016-05-20 2016-08-31 深圳维普创新科技有限公司 Adjustable voltage feedback circuit with constant current protection and working method

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JP2001209442A (en) * 2000-01-27 2001-08-03 Sony Corp Power supply and its control method
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105337351A (en) * 2015-10-30 2016-02-17 苏州扬佛自动化设备有限公司 Charger control circuit
CN105334755A (en) * 2015-10-30 2016-02-17 苏州扬佛自动化设备有限公司 Electric vehicle power source control circuit
CN105305850A (en) * 2015-11-13 2016-02-03 苏州扬佛自动化设备有限公司 Voltage reduction control circuit of switching power supply
CN105305851A (en) * 2015-11-13 2016-02-03 苏州扬佛自动化设备有限公司 Voltage reduction control method of switching power supply
CN105914832A (en) * 2016-05-20 2016-08-31 深圳维普创新科技有限公司 Adjustable voltage feedback circuit with constant current protection and working method
CN105914832B (en) * 2016-05-20 2021-07-06 深圳维普创新科技有限公司 Adjustable voltage feedback circuit with constant current protection and working method

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Effective date of registration: 20160720

Address after: 471000 Henan Luoyang Luoning County Industrial Agglomeration Area

Patentee after: Luoyang Jiasheng New Energy Technology Co., Ltd.

Address before: 471003 Henan Province, Luoyang city high tech Development Zone extension path torch Park C block, floor 4

Patentee before: Luoyang Grasen Power Technology Co., Ltd.