CN102999073B - 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 PDFInfo
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- CN102999073B CN102999073B CN201110265332.9A CN201110265332A CN102999073B CN 102999073 B CN102999073 B CN 102999073B CN 201110265332 A CN201110265332 A CN 201110265332A CN 102999073 B CN102999073 B CN 102999073B
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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
Technical field
The present invention relates to a kind of power supply technique, particularly relate to one and be applied in power supply technique as being applied to the constant voltage constant current control circuit that can realize external control (as Long-distance Control) in Switching Power Supply and charging device (especially high-power charger and charger etc.) etc.
Background technology
At present, Switching Power Supply controls mostly to adopt negative feedback control technology, on the basis of feedback network, namely realize the control to Switching Power Supply.
Inventor is realizing finding in process of the present invention: negative feedback control technology disconnects at feedback network, output voltage or the output current of Switching Power Supply are in runaway condition, thus may cause damage to the rear class consumer of Switching Power Supply and Switching Power Supply.
Because the defect that above-mentioned existing feedback control technology exists, the present inventor is based on being engaged in the practical experience and professional knowledge that this type of product design manufacture enriches for many years, coordinate the utilization of scientific principle, actively in addition research and innovation, to founding a kind of constant voltage constant current control circuit be applied in power supply technique of new structure, existing feedback control technology Problems existing can be overcome, make it have more practicality.Through constantly research, design, and through repeatedly studying sample and after improving, finally creating the present invention had practical value.
Summary of the invention
The object of the invention is to, overcome the defect that existing negative feedback control technology exists, and a kind of constant voltage constant current control circuit be applied in power supply technique of new structure is provided, technical matters to be solved is, the output voltage of Switching Power Supply or charging device etc. or output current is avoided to be in runaway condition, to improve Supply Security, be very suitable for practicality.
Object of the present invention and solve its technical matters and can adopt following technical scheme to realize.
According to the constant voltage constant current control circuit be applied in power supply technique that the present invention proposes, this control circuit comprises: described control circuit comprises: be applied to the voltage control loop in power supply technique, be applied to current controlled circuit in power supply technique and photo-coupler; Described voltage control loop and the series connection of described current controlled circuit, and an input end of described photo-coupler is connected with the voltage output end of described voltage control loop, another input end is connected with the voltage output end of described current controlled circuit; An input end of described voltage control loop be in 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 power supply technique current feedback sampling input end, another input end is reference voltage input.
Object of the present invention and solve its technical matters and can also be further achieved by the following technical measures.
Preferably, the aforesaid constant voltage constant current control circuit be applied in power supply technique, wherein Voltage Feedback sampling input end is connected with the positive input terminal of the operational amplifier in described voltage control loop, and described current feedback sampling input end is connected with the negative input end of the operational amplifier in described current controlled circuit.
Preferably, the aforesaid constant voltage constant current control circuit be applied in power supply technique, wherein Voltage Feedback sampling input end is connected with the negative input end of the operational amplifier in described voltage control loop, and described current feedback sampling input end is connected with the positive input terminal of the operational amplifier in described current controlled circuit.
Preferably, the aforesaid constant voltage constant current control circuit be applied in power supply technique, wherein said photo-coupler is phototriode cast photo-coupler, and the collector of phototriode in described photo-coupler connects reference voltage, emitter output voltage.。
By technique scheme, the constant voltage constant current control circuit be applied in power supply technique of the present invention at least has following advantages and beneficial effect: the present invention is by connecting voltage control loop and current controlled circuit, and voltage control loop and current controlled circuit are connected with the input end of photo-coupler respectively, constant voltage constant current control circuit is made no matter to be to stop power supply supplying when electric voltage exception or current anomaly, not only achieve external signal Long-distance Control, and can realize exporting without complete power cutoff during control signal, power supply is made to be in energy saver mode (as gauge tap main power control chip pulse width modulation PWM exports, like this, Switching Power Supply main power circuit reaches zero loss), thus on the basis enhancing the remote controllability such as Switching Power Supply and charging device, Switching Power Supply or charging device (especially high-power charger or charger) etc. is made can externally to provide the power supply of constant pressure and flow to supply, effectively prevent the adverse effect that abnormity of power supply causes to Switching Power Supply or charger or rear class consumer, improve the voltage stabilization and current stabilization precision of control circuit, and then invention increases electrical safety, be very suitable for practicality.
In sum, the present invention has significant progress technically, and has significantly positive technique effect, is really a new and innovative, progressive, practical new design.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of instructions, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the constant voltage constant current control circuit schematic diagram be applied in power supply technique of the present invention.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of constant voltage constant current control circuit, structure, feature and effect of being applied in power supply technique of proposing according to the present invention, be described in detail as follows.
A kind of constant voltage constant current control circuit be applied in power supply technique of the specific embodiment of the invention comprises: be applied to the voltage control loop in power supply technique, be applied to current controlled circuit in power supply technique and photo-coupler.Wherein, voltage control loop and current controlled circuit are connected in series, and an input end of photo-coupler is connected with the voltage output end of voltage control loop, and another input end of photo-coupler is connected with the voltage output end of current controlled circuit.An input end of voltage control loop is the Voltage Feedback sampling input end in 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 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 the following two kinds:
The first set-up mode: Voltage Feedback sampling input end is connected with the positive input terminal of the operational amplifier in voltage control loop, and the negative input end of the operational amplifier in voltage control loop is connected with reference voltage input; Current feedback sampling input end is connected with the negative input end of the operational amplifier in current controlled circuit, and the positive input terminal of the operational amplifier in current controlled circuit is connected with reference voltage input.
The second set-up mode: Voltage Feedback sampling input end is connected with the negative input end of the operational amplifier in voltage control loop, and the positive input terminal of the operational amplifier in voltage control loop is connected with reference voltage input; Current feedback sampling input end is connected with the positive input terminal of the operational amplifier in current controlled circuit, and the negative input end of the operational amplifier in 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.
When this photo-coupler is phototriode cast photo-coupler, the base stage of the phototriode in this photo-coupler is photosensitive, and collector connects reference voltage (i.e. Vref), emitter output supply voltage.
Fig. 1 is a concrete implementing circuit figure of the constant voltage constant current control circuit be applied in power supply technique of the present invention.
The left side of the circuit shown in Fig. 1 is photo-coupler, and right side comprises current controlled circuit and voltage control loop.At the I of the top on right side
0(V
0+) connect sample rate current (i.e. I
0(V
0+) be current feedback sampling input end), and the V bottom on right side
0+ (I
0) connect sampled voltage (i.e. V
0+ (I
0) be Voltage Feedback sampling input end) time, the first half circuit on the right side in Fig. 1 is current controlled circuit, and the latter half on right side is voltage control loop.At the I of the top on right side
0(V
0+) connect sampled voltage (i.e. I
0(V
0+) be Voltage Feedback sampling input end), and the V bottom on right side
0+ (I
0) connect sample rate current (i.e. V
0+ (I
0) be current feedback sampling input end) time, the first half circuit on the right side in Fig. 1 is voltage control loop, and the latter half on right side is current controlled circuit.
Control circuit shown in Fig. 1 is at I
0(V
0+) connect sample rate current and V
0+ (I
0) connect sampled voltage when, sample rate current is connected with the negative input end (i.e. 6 ends) of upside operational amplifier, reference voltage (i.e. 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 (i.e. VREF-1) is connected with the negative input end (i.e. 2 ends) of downside operational amplifier, now, only the output terminal (i.e. 7 ends) of upside operational amplifier be high and the output terminal of downside operational amplifier (i.e. 1 end) for time low, photo-coupler normally works, output supply voltage, otherwise, photo-coupler quits work, supply voltage is not had to export.Namely when any one reference edge no-voltage signal (namely without reference voltage), power supply and no-output.
Control circuit shown in Fig. 1 is at I
0(V
0+) connect sampled voltage and V
0+ (I
0) connect sample rate current when, sampled voltage is connected with the negative input end (i.e. 6 ends) of upside operational amplifier, reference voltage (i.e. 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 (i.e. VREF-1) is connected with the negative input end (i.e. 2 ends) of downside operational amplifier, now, only at the output terminal (i.e. 7 ends) of upside operational amplifier for the low and output terminal of downside operational amplifier (i.e. 1 end) is for time high, photo-coupler normally works, output supply voltage, otherwise, photo-coupler quits work, supply voltage is not had to export.Namely when any one reference edge no-voltage signal (namely without reference voltage), power supply and no-output.
As can be seen from the physical circuit shown in Fig. 1, when feedback network disconnects, photo-coupler can not normally work, thus powered-down exports automatically; Normal at feedback network, and when applying control circuit with VREF (reference voltage), only when constant pressure and flow, photo-coupler just can normally work, thus provides power supply to export.
Specifically, I in FIG
0(V
0+) connect sample rate current and V
0+ (I
0) connect sampled voltage when, when control circuit is operated in pressure constant state, voltage control loop wherein plays the effect of error amplifier, and current controlled circuit wherein plays the effect of voltage comparator, and the operational amplifier in current controlled circuit exports high level always; And after power supply sample rate current reaches constant current point, control circuit automatically switches to constant current state work, and now, current controlled circuit plays the effect of error amplifier, and voltage control loop plays the effect of voltage comparator, and voltage control loop output low level always; Thus photo-coupler normally works, the base stage of the phototriode in this photo-coupler is photosensitive, and collector connects reference voltage (i.e. Vref), and emitter exports certain control voltage, controls the voltage required for power supply output.
In addition, voltage and current feedback sample point is being exchanged, namely the I0 (V0+) in Fig. 1 connect sampled voltage and V0+ (I0) connects sample rate current when, then the state of voltage and current is contrary with foregoing description, but can play same constant pressure and flow effect.Concrete, when control circuit is operated in constant current state, wherein current controlled circuit plays the effect of error amplifier, and voltage control loop plays the effect of voltage comparator, and voltage control loop exports high level always; And after sampled voltage reaches constant pressure point, control circuit automatically switches to pressure constant state work, and now, voltage control loop plays the effect of error amplifier, current controlled circuit wherein plays the effect of voltage comparator, and the operational amplifier output low level always in current controlled circuit; Thus photo-coupler normally works, the base stage of the phototriode in this photo-coupler is photosensitive, and collector connects reference voltage (i.e. Vref), and emitter exports certain control voltage, controls the voltage required for power supply output.
The above is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to specifically limit the present invention, any those skilled in the art are not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that 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. be applied to the constant voltage constant current control circuit in power supply technique, it is characterized in that, described control circuit comprises: be applied to the voltage control loop in power supply technique, be applied to current controlled circuit in power supply technique and photo-coupler;
Described voltage control loop and the series connection of described current controlled circuit, and an input end of described photo-coupler is connected with the voltage output end of described voltage control loop, another input end is connected with the voltage output end of described current controlled circuit;
An input end of described voltage control loop is the Voltage Feedback sampling input end in power supply technique, and another input end is reference voltage input;
An input end of described current controlled circuit is the current feedback sampling input end in power supply technique, and another input end is reference voltage input.
2. be applied to the constant voltage constant current control circuit in power supply technique as claimed in claim 1, it is characterized in that, described Voltage Feedback sampling input end is connected with the positive input terminal of the operational amplifier in described voltage control loop, and described current feedback sampling input end is connected with the negative input end of the operational amplifier in described current controlled circuit.
3. be applied to the constant voltage constant current control circuit in power supply technique as claimed in claim 1, it is characterized in that, described Voltage Feedback sampling input end is connected with the negative input end of the operational amplifier in described voltage control loop, and described current feedback sampling input end is connected with the positive input terminal of the operational amplifier in described current controlled circuit.
4. the constant voltage constant current control circuit be applied in power supply technique as described in claim 1 or 2 or 3, it is characterized in that, described photo-coupler is phototriode cast photo-coupler, and the collector of phototriode in described photo-coupler connects reference voltage, emitter output voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110265332.9A CN102999073B (en) | 2011-09-08 | 2011-09-08 | Constant-voltage and constant-current control circuit applied to power supply technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110265332.9A CN102999073B (en) | 2011-09-08 | 2011-09-08 | Constant-voltage and constant-current control circuit applied to power supply technology |
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| Publication Number | Publication Date |
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| CN102999073A CN102999073A (en) | 2013-03-27 |
| CN102999073B true CN102999073B (en) | 2015-04-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105337351A (en) * | 2015-10-30 | 2016-02-17 | 苏州扬佛自动化设备有限公司 | Charger control circuit |
| 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 |
| 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 |
| 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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| CN102999073A (en) | 2013-03-27 |
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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. |