CN114740932B - Output power voltage stabilizing feedback system - Google Patents
Output power voltage stabilizing feedback system Download PDFInfo
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- CN114740932B CN114740932B CN202210428233.6A CN202210428233A CN114740932B CN 114740932 B CN114740932 B CN 114740932B CN 202210428233 A CN202210428233 A CN 202210428233A CN 114740932 B CN114740932 B CN 114740932B
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- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 40
- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 230000009123 feedback regulation Effects 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000002955 isolation Methods 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 claims 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses an output power supply voltage stabilizing feedback system, and relates to the technical field of power supply output systems. The system comprises: the circuit comprises an optocoupler, a zener diode, a first resistor, a second resistor and a third resistor. The first input end of the optical coupler is connected with one end of the third resistor; the second input end of the optical coupler is connected with the cathode of the zener diode; the first output end of the optical coupler and the second output end of the optical coupler are both connected with a pulse width modulation unit of the power supply; the reference end of the voltage stabilizing diode is respectively connected with one end of the first resistor and one end of the second resistor; the other end of the first resistor and the anode of the zener diode are grounded; the other end of the second resistor is connected with a load end voltage feedback sampling point; the other end of the third resistor is connected with the output voltage end of the power supply, wherein the voltage feedback sampling point of the load end is a node of the output wire rod and the load. The invention can carry out feedback regulation on the output voltage of the power supply, and realize stable control on the voltage of the load terminal.
Description
Technical Field
The invention relates to the technical field of power supply output systems, in particular to an output power supply voltage stabilizing feedback system.
Background
With the continuous development of electronic technology and information technology, more and more electronic devices enter daily work and life of people, the degree of informatization of society is also higher and higher, and the electronic devices become an indispensable part of daily work and life of people. The power supply is called a heart of electronic equipment, and particularly in the fields of precision instruments, display equipment and the like, and it is important that the power supply is required to meet the rated output voltage range.
However, under the conditions that the output power supply current is large and the output wire is long, the output voltage of the power supply equipment reaches the load end after passing through the output wire, and because the output wire conductor has a resistor, the voltage difference can be generated after passing through the current, so that the voltage of the load end is inconsistent with the voltage of the power supply output end, the voltage of the load end cannot be accurately controlled, and the power load with the requirement on the voltage stability coefficient can be greatly influenced.
Disclosure of Invention
The invention aims to provide an output power supply voltage stabilizing feedback system so as to avoid the problem of unstable voltage of a load end caused by pressure difference generated by wire transmission loss and realize accurate control of the voltage of the load end.
In order to achieve the above object, the present invention provides the following solutions:
an output power supply regulated feedback system, the system comprising: the circuit comprises an optocoupler, a zener diode, a first resistor, a second resistor and a third resistor;
the first input end of the optocoupler is connected with one end of the third resistor; the second input end of the optocoupler is connected with the cathode of the zener diode; the first output end of the optical coupler and the second output end of the optical coupler are both connected with a pulse width modulation unit of a power supply;
the anode of the voltage stabilizing diode is grounded; the reference end of the zener diode is respectively connected with one end of the first resistor and one end of the second resistor;
the other end of the first resistor is grounded;
the other end of the second resistor is connected with a load end voltage feedback sampling point; the load end voltage feedback sampling point is a node of an output wire and a load;
the other end of the third resistor is connected with the output voltage end of the power supply;
the voltage stabilizing diode is used for adjusting the current of the optocoupler according to the voltage change of the voltage feedback sampling point of the load end; the optocoupler is used for controlling the pulse width modulation unit according to current change so as to perform feedback adjustment on the output voltage of the power supply.
Optionally, the system further comprises: a switch;
the movable end of the switch is connected with the other end of the second resistor; the first stationary end of the switch is connected with the voltage feedback sampling point of the load end; the second stationary end of the switch is connected with a voltage feedback sampling point of the power supply end; the power supply end voltage feedback sampling point is connected with the output voltage end of the power supply;
when the load needs to be stabilized, the movable end is connected with the first fixed end; and when the load does not need voltage stabilization, the movable end is connected with the second fixed end.
Optionally, the optocoupler includes: a light emitting diode and a phototransistor;
the light emitting diode is arranged corresponding to the phototriode;
the two ends of the light emitting diode are respectively a first input end and a second input end of the optocoupler; the two ends of the phototriode are respectively a first output end and a second output end of the optocoupler;
the light-emitting diode is used for adjusting the light-emitting quantity according to the current change; the phototriode is used for adjusting the switching frequency according to the luminous quantity; the switching frequency is used to control the pulse width modulation unit.
Optionally, the system further comprises: a fourth resistor;
one end of the fourth resistor is connected with the first input end of the optocoupler and one end of the third resistor respectively; the other end of the fourth resistor is connected with the second input end of the optocoupler and the cathode of the zener diode respectively.
Optionally, the system further comprises: a polar capacitor is arranged;
the positive electrode of the polar capacitor is connected with the output voltage end of the power supply; and the negative electrode of the polar capacitor is grounded.
Optionally, the system further comprises: an output diode;
the anode of the output diode is connected with the secondary end of the isolation transformer of the power supply; the cathode of the output diode is connected with the other end of the third resistor; the cathode of the output diode is an output voltage end of the power supply.
Optionally, the zener diode is of model TL431.
Optionally, the optical coupler is of a type TLP521 or PC817.
Optionally, the resistance value of the third resistor is 6kΩ; the resistance value of the fourth resistor is 3k omega.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides an output power supply voltage stabilizing feedback system, which comprises: the circuit comprises an optocoupler, a zener diode, a first resistor, a second resistor and a third resistor. The first input end of the optical coupler is connected with one end of the third resistor; the second input end of the optical coupler is connected with the cathode of the zener diode; the first output end of the optical coupler and the second output end of the optical coupler are both connected with a pulse width modulation unit of the power supply; the reference end of the voltage stabilizing diode is respectively connected with one end of the first resistor and one end of the second resistor; the other end of the second resistor is connected with a load end voltage feedback sampling point; the other end of the third resistor is connected with the output voltage end of the power supply. According to the invention, the node of the output wire and the load is used as a load end voltage feedback sampling point, and the voltage stabilizing diode is used for adjusting the current of the optocoupler according to the voltage change of the sampling point, so that the optocoupler controls the pulse width modulation unit according to the current change, and the output voltage of the power supply is subjected to feedback regulation, so that the stable control of the load end voltage can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of an output power supply voltage stabilizing feedback system provided by the invention.
Symbol description: the voltage stabilizing diode-U1, the optocoupler-U2, the first resistor-R1, the second resistor-R2, the third resistor-R3, the fourth resistor-R4, the polar capacitor-C1, the output diode-D1, the switch-S, the load terminal voltage feedback sampling point-P, the power terminal voltage feedback sampling point-Q and the output voltage terminal-V.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide an output power supply voltage stabilizing feedback system which is suitable for an AC/DC power supply output control system, so as to avoid the problem of unstable voltage of a load end caused by pressure difference generated due to wire transmission loss and realize accurate control of the voltage of the load end.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
When the power supply is in a specific occasion, such as the power supply equipment is far away from the load, the power supply and the load are connected by adopting an output wire, and the voltage difference between the power supply and the load is generated by adopting the connection of the output wire due to the existence of the resistor of the output wire. For example, the common power supply is 12Vdc, the voltage of the test load terminal is 11.56V, the voltage of the power terminal is 12.3V when the load is output, the voltage of the power terminal is 12.3V when the load is idle, and the voltage generated when the load current flows through the output wire is obviously lost by the output wire.
Since the voltage differential is related to the wire material, section S, length L, negative current I, etc., it is currently common to increase the number of output wires so as to reduce the voltage differential as much as possible by increasing the conductor cross-sectional area through phase inversion. The individual wire resistance can be calculated by the formula r=resistivity L/S, where the resistivity is related to the wire material, e.g. copper wire resistivity is 0.0172 Ω m and aluminum wire is 0.0283 Ω m. Further, by calculating the voltage drop across the individual wires by the formula u=ri, it can be found that when the current flowing through the output wire changes, the voltage drop across the output wire is equally affected and the voltage loss across the output wire is proportional to the current flowing through the output wire.
Therefore, under the condition that the output current of the output power supply is large, the power supply can generate pressure difference between the output wire and the load, the pressure difference can cause the inconsistency between the voltage obtained by the load and the actual power supply output end, and the means for reducing the pressure difference provided by the prior art can not accurately control the voltage of the load end under the use situation that the load has the precision requirement on the voltage.
Based on this, under the use environment that requires a specific voltage stabilization, there is an urgent need for a power supply system that can completely avoid the voltage difference caused by the loss of the transmission wire, so as to keep the load terminal voltage after the transmission through the output wire to meet the load requirement.
The invention provides an output power supply voltage stabilizing feedback system, fig. 1 is a circuit diagram of the output power supply voltage stabilizing feedback system provided by the invention, as shown in fig. 1, the system comprises: the circuit comprises an optocoupler U2, a zener diode U1, a first resistor R1, a second resistor R2 and a third resistor R3.
The first input end of the optocoupler U2 is connected with one end of the third resistor R3; the second input end of the optical coupler U2 is connected with the cathode of the zener diode U1; the first output end of the optical coupler U2 and the second output end of the optical coupler U2 are connected with a pulse width modulation unit of a power supply. The anode of the zener diode U1 is grounded; the reference end of the zener diode U1 is connected to one end of the first resistor R1 and one end of the second resistor R2, respectively. The other end of the first resistor R1 is grounded. The other end of the second resistor R2 is connected with a load end voltage feedback sampling point P; the load end voltage feedback sampling point P is a node of an output wire and a load; the voltage of the load end voltage feedback sampling point P is equal to the input voltage of the load. The other end of the third resistor R3 is connected with an output voltage end V of the power supply. The zener diode U1 is configured to adjust a current of the optocoupler U2 according to a voltage change of the load end voltage feedback sampling point P; the optocoupler U2 is used for controlling the pulse width modulation unit according to current change so as to perform feedback adjustment on the output voltage of the power supply.
Further, the optocoupler U2 includes: light emitting diodes and phototransistors. The light emitting diode is arranged corresponding to the phototriode. The two ends of the light emitting diode are respectively a first input end and a second input end of the optical coupler U2; the two ends of the phototriode are respectively a first output end and a second output end of the optical coupler U2. The light-emitting diode is used for adjusting the light-emitting quantity according to the current change; the phototriode is used for adjusting the switching frequency according to the luminous quantity; the switching frequency is used to control the pulse width modulation unit.
Specifically, when the alternating current at the input end of the power supply changes or the load at the output end changes, the voltage at the load end changes, so that the power supply is required to have stable voltage output.
Further, to enable the feedback adjustment described above to be used only in certain situations, the system further comprises: and a switch S. The movable end of the switch S is connected with the other end of the second resistor R2; the first stationary end of the switch S is connected with the load end voltage feedback sampling point P; the second stationary end of the switch S is connected with a voltage feedback sampling point Q of the power supply end; the power supply end voltage feedback sampling point Q is connected with the output voltage end V of the power supply. When the load needs to be stabilized, the movable end is connected with the first fixed end; and when the load does not need voltage stabilization, the movable end is connected with the second fixed end.
As a specific embodiment, the switch S is a micro-type hand switch. When the power supply is required to be used in long-distance wire transmission and the precision requirement of the load on the input voltage is high, the power supply is required to be output to the load through the output wire, a sampling wire is reserved on the output wire, the switch S is required to be connected with the sampling wire, the switch S is toggled to a load end voltage feedback sampling point P, so that the pressure difference generated by the loss of the output wire can be ensured to be fed back through the load end voltage feedback sampling point P, the power supply is enabled to raise the output voltage, the voltage value required by the load is achieved after passing through the wire, and the pressure difference generated on the output wire is avoided. When the distance of the output wire is short or the requirement of the load on the power supply voltage range is wide, the switch S is pulled back to the power supply end voltage feedback sampling point Q, namely the voltage of the sampling point of the power supply is taken, so that the overhigh output voltage caused by the open circuit of the sampling point can be prevented, and the normal output voltage of the power supply is ensured.
Further, the system further comprises: and a fourth resistor R4. One end of the fourth resistor R4 is connected with the first input end of the optical coupler U2 and one end of the third resistor R3 respectively; the other end of the fourth resistor R4 is connected with the second input end of the optocoupler U2 and the cathode of the zener diode U1 respectively. In this embodiment, the third resistor R3 is a current limiting resistor. The third resistor R3 is connected in series with the optocoupler U2 to play a role in current limiting, so that the light-emitting diode in the optocoupler U2 can be prevented from being damaged by overlarge breakdown of current. The fourth resistor R4 is a current bleed resistor. The fourth resistor R4 is connected in parallel to two ends of the input end of the optocoupler U2, and is used for stabilizing a circuit structure and providing a base current for the zener diode U1, so as to prevent the zener diode U1 from operating to a closed area (i.e., an excessively small current value). At the same time, the voltage variation caused by the zener diode U1 is also reflected on the fourth resistor R4.
Further, the system further comprises: and an output diode D1. The anode of the output diode D1 is connected with the secondary end of the isolation transformer of the power supply; the cathode of the output diode D1 is connected with the other end of the third resistor R3; the cathode of the output diode D1 is the output voltage terminal V of the power supply. The output diode D1 is configured to rectify the alternating current output from the secondary side of the isolation transformer. Specifically, the alternating voltage output by the pulse width modulation unit (i.e. the switching tube modulation unit) is output by the isolation transformer and is rectified by the output diode D1 to be converted into direct-current voltage to be output.
Further, the system further comprises: there is a polar capacitance C1. The positive electrode of the polar capacitor C1 is connected with the output voltage end V of the power supply; the negative electrode of the polar capacitor C1 is grounded. The polar capacitor C1 is a filter capacitor, and because the output power supply voltage stabilizing feedback system provided by the invention is applied to an AC/DC power supply output control system, the output is direct current, and the polar capacitor C1 is used for filtering alternating current components in output voltage. Specifically, the output voltage rectified by the output diode D1 is filtered by the capacitor C1 with polarity to obtain DC direct current which is finally used for outputting to a load.
As a specific embodiment, the zener diode U1 is preferably TL431. The model of the optocoupler U2 is preferably TLP521 or PC817. The resistance value of the third resistor R3 is 6k omega; the resistance value of the fourth resistor R4 is 3k omega. However, the present invention is not limited thereto, and may be adjusted according to actual conditions.
The principle of the present invention will be described in detail below by taking the example that the output voltage is 120V dc voltage, the zener diode U1 is the reverse breakdown zener diode TL431, the resistance of the third resistor R3 is 6kΩ, and the resistance of the fourth resistor R4 is 3kΩ:
referring to fig. 1, R1 and R2 are 120V output voltage dividing resistors, and when the switch S samples at the 120V power supply voltage feedback sampling point Q, the current calculation formula of the voltage dividing resistors R1 and R2 is 2.5/r1= (120-2.5)/R2. When the output voltage changes due to load change or alternating current power grid voltage change, the sampling point voltage also synchronously changes (namely, the voltage value rises or falls), after the voltage is divided by the resistors R1 and R2, the voltage at the reference end of the voltage stabilizing diode changes (namely, when the sampling point voltage rises, the voltage at the reference end rises, and when the sampling point voltage falls, the voltage at the reference end falls), the voltage at the reference end is compared with the reference voltage (such as TL431 reference voltage is 2.5V) of the voltage stabilizing diode U1, the cathode voltage of the voltage stabilizing diode U1 changes, the current of the optocoupler U2 is adjusted, the optocoupler U2 controls a pulse width modulation unit of a power supply, and the output voltage of the power supply is adjusted, so that the output voltage stability is realized. The same applies when the switch S samples at the load-side voltage feedback sampling point P.
Specifically, when the voltage of the sampling point increases, the voltage of the reference end of the zener diode U1 increases, which is greater than the reference voltage 2.5V of the zener diode U1, the cathode voltage of the zener diode U1 decreases, the voltage of the two ends of the light emitting diode inside the optocoupler U2 increases, and the current flowing through the light emitting diode increases, so that the output current of the optocoupler U2 increases, thereby affecting the pulse width modulation unit of the power supply. When the voltage of the sampling point is reduced, the voltage of the reference end of the zener diode U1 is reduced and is smaller than the reference voltage 2.5V of the zener diode U1, the cathode voltage of the zener diode U1 is increased, the voltage of the two ends of the light emitting diode inside the optocoupler U2 is reduced, the current flowing through the light emitting diode is reduced, and the output current of the optocoupler U2 is reduced, so that the pulse width modulation unit of the power supply is affected.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the core concept of the invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. An output power supply voltage regulation feedback system, the system comprising: the circuit comprises an optocoupler, a zener diode, a first resistor, a second resistor and a third resistor;
the first input end of the optocoupler is connected with one end of the third resistor; the second input end of the optocoupler is connected with the cathode of the zener diode; the first output end of the optical coupler and the second output end of the optical coupler are both connected with a pulse width modulation unit of a power supply; the optocoupler includes: a light emitting diode and a phototransistor; the light emitting diode is arranged corresponding to the phototriode; the two ends of the light emitting diode are respectively a first input end and a second input end of the optocoupler; the two ends of the phototriode are respectively a first output end and a second output end of the optocoupler; the light-emitting diode is used for adjusting the light-emitting quantity according to the current change; the phototriode is used for adjusting the switching frequency according to the luminous quantity; the switching frequency is used for controlling the pulse width modulation unit;
the anode of the voltage stabilizing diode is grounded; the reference end of the zener diode is respectively connected with one end of the first resistor and one end of the second resistor;
the other end of the first resistor is grounded;
the other end of the second resistor is connected with a load end voltage feedback sampling point; the load end voltage feedback sampling point is a node of an output wire and a load;
the other end of the third resistor is connected with the output voltage end of the power supply;
the voltage stabilizing diode is used for adjusting the current of the optocoupler according to the voltage change of the voltage feedback sampling point of the load end; the optocoupler is used for controlling the pulse width modulation unit according to current change so as to perform feedback regulation on the output voltage of the power supply;
the system further comprises: a switch; the movable end of the switch is connected with the other end of the second resistor; the first stationary end of the switch is connected with the voltage feedback sampling point of the load end; the second stationary end of the switch is connected with a voltage feedback sampling point of the power supply end; the power supply end voltage feedback sampling point is connected with the output voltage end of the power supply; when the load needs to be stabilized, the movable end is connected with the first fixed end; and when the load does not need voltage stabilization, the movable end is connected with the second fixed end.
2. The output power supply voltage regulation feedback system of claim 1, wherein the system further comprises: a fourth resistor;
one end of the fourth resistor is connected with the first input end of the optocoupler and one end of the third resistor respectively; the other end of the fourth resistor is connected with the second input end of the optocoupler and the cathode of the zener diode respectively.
3. The output power supply voltage regulation feedback system of claim 1, wherein the system further comprises: a polar capacitor is arranged;
the positive electrode of the polar capacitor is connected with the output voltage end of the power supply; and the negative electrode of the polar capacitor is grounded.
4. The output power supply voltage regulation feedback system of claim 1, wherein the system further comprises: an output diode;
the anode of the output diode is connected with the secondary end of the isolation transformer of the power supply; the cathode of the output diode is connected with the other end of the third resistor; the cathode of the output diode is an output voltage end of the power supply.
5. The output power supply voltage regulation feedback system of claim 1 wherein the zener diode is model TL431.
6. The output power voltage regulation feedback system of claim 1 wherein the optocoupler is of the type TLP521 or PC817.
7. The output power supply voltage stabilizing feedback system according to claim 2, wherein the third resistor has a resistance of 6kΩ; the resistance value of the fourth resistor is 3k omega.
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| CN105634252A (en) * | 2016-03-02 | 2016-06-01 | 珠海格力电器股份有限公司 | Control circuit of switching power supply |
| CN206336142U (en) * | 2016-10-28 | 2017-07-18 | 广东恒沃动力科技有限公司 | Battery management system |
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