CN109951075B - Load regulation control circuit of switching power supply and implementation method thereof - Google Patents
Load regulation control circuit of switching power supply and implementation method thereof Download PDFInfo
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Abstract
The invention discloses a load regulation control circuit of a switching power supply and an implementation method thereof, wherein the circuit comprises a client load and the switching power supply, the client load is connected with the switching power supply through a direct current power cable, a current signal of the switching power supply enters a proportional amplifier after being amplified by a network amplifier, the proportional amplifier is connected with an inverter and a follower, and the output ends of the inverter and the follower are superposed with a PWM (pulse width modulation) signal of the client load to obtain the output voltage of the switching power supply; in the method, a switching power supply obtains the load current and the load voltage of a client load, and the direct current output end current and the direct current output end voltage of the switching power supply, compares all data in real time, and adjusts the direct current output end voltage in real time. The invention solves the problem of insufficient remote load capacity between the switching power supply and the client due to power cable loss, has the advantages of simplicity and lower cost, and is worthy of popularization.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a load regulation control circuit of a switching power supply and an implementation method thereof.
Background
With the development of science and technology, the application of the switching power supply is increased, and the control modes of the switching power supply are diversified. Because a cable with a certain length is arranged between the switching power supply and the client load, the existence of the cable and the client load can divide the voltage of the switching power supply, the voltage of the client load is reduced, and the power supply pressure of the switching power supply is increased.
In order to ensure the voltage increase of the client load, the voltage of the power supply end is generally increased or a cable material with high conductivity is adopted, but the methods do not eliminate the voltage division of the cable, and meanwhile, the control mode is high in cost and is not beneficial to the continuous utilization of resources. In addition, other control methods in the prior art are slow in implementation speed, and cannot perform trial adjustment and control, so that load voltage of a client is unstable, and normal use of the client is affected.
The above-mentioned drawbacks are worth solving.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the load regulation control circuit of the switching power supply and the implementation method thereof, which can stably regulate the load of the client in real time, reduce the corresponding cost and realize the continuous utilization of resources.
The technical scheme of the invention is as follows:
a load regulation control circuit of a switching power supply comprises a client load and the switching power supply, wherein the client load is connected with the switching power supply through a direct current power cable,
and current signals of the switching power supply enter a proportional amplifier after being amplified by a network amplifier, the proportional amplifier is connected with an inverter and a follower, and the output ends of the inverter and the follower are superposed with PWM (pulse-width modulation) signals of the client load to obtain the output voltage of the switching power supply.
The invention according to the above scheme is characterized in that the network amplifier comprises a first amplifier U1-A, an output end of the first amplifier U1-A is connected with the proportional amplifier, an output end of the first amplifier U1-A is connected to a second pin of the first amplifier U1-A through a first resistor R1, a second pin of the first amplifier U1-A is connected with a current signal of the switching power supply through a second resistor R2, a third pin of the first amplifier U1-A is connected with the current signal of the switching power supply through a third resistor R3, and a third pin of the first amplifier U1-A is connected with a common end through a fourth resistor R4.
The invention according to the above scheme is characterized in that the proportional amplifier comprises a digital potentiometer U5 and a second amplifier U2, the sixth pin of the digital potentiometer U5 is connected with the network amplifier, and the sixth pin of the digital potentiometer U5 is connected with the second amplifier U2;
the seventh pin of the second amplifier U2 is connected with the sixth pin thereof through a sixth resistor R6, the fifth pin of the second amplifier U2 is connected with the common end through a fifth resistor R5, the seventh pin of the second amplifier U2 is connected with the third pin thereof, the first pin of the second amplifier U2 is connected with the second pin thereof, and the first pin of the second amplifier U2 is connected with the inverter and the follower.
Furthermore, a fifth pin of the digital potentiometer U5 is connected to a +5V power supply through a parallel diode D, an eighth pin of the digital potentiometer U5 is connected to the +5V power supply, and the eighth pin of the digital potentiometer U5 is connected to the common terminal through a twelfth capacitor C12, and a seventh pin of the digital potentiometer U5 is connected to the common terminal through a fourteenth resistor R14;
a fourth pin of the digital potentiometer U5 is connected with the common end, and a first pin of the digital potentiometer U5 is connected with the common end after passing through a seventeenth resistor R17;
the fourth pin of the digital potentiometer U5 is connected with the third pin thereof through a thirteenth capacitor C13, and the third pin of the digital potentiometer U5 is connected with a +5V power supply through a fifteenth resistor R15; the fourth pin of the digital potentiometer U5 is connected to the second pin thereof through a fourteenth capacitor C14, and the second pin of the digital potentiometer U5 is connected to a +5V power supply through a sixteenth resistor R16.
The inverter and follower according to the present invention of the above solution includes a third amplifier U3 and a fourth amplifier U4, the sixth pin of the third amplifier U3 is connected to the proportional amplifier through a seventh resistor R7, the seventh pin of the third amplifier U3 is connected to the sixth pin thereof through an eighth resistor R8, the seventh pin of the third amplifier U3 is connected to the third pin thereof, and the first pin thereof is connected to the second pin thereof;
a fifth pin of the fourth amplifier U4 is connected with the PWM signal of the client load through a thirteenth resistor R13, and a fifth pin of the fourth amplifier U4 is connected to the common terminal through an eleventh capacitor C11, a seventh pin of the fourth amplifier U4 is connected to a sixth pin thereof, and a seventh pin of the fourth amplifier U4 is connected to a first pin of the third amplifier U3;
and a first pin of the third amplifier U3 is communicated with a seventh pin of the fourth amplifier U4 and is superposed to output the superposed voltage to obtain the output voltage of the switching power supply.
On the other hand, an implementation method of a load regulation control circuit using the switching power supply is characterized by comprising the following steps:
(1) the client load obtains the load current and the load voltage of the client load;
(2) the switching power supply obtains the current of a direct current output end and the voltage of the direct current output end;
(3) the switching power supply collects load current and load voltage of the client load through a direct current power cable;
(4) the switching power supply compares the load current with the direct current output end current, and compares the load voltage with the direct current output end voltage in real time;
(5) the switching power supply adjusts the voltage of the direct current output end in real time according to the following formula:
VOUT＝Vload(s)+IOUT×RThread
Wherein, VOUTFor the dc output voltage, VLoad(s)Is the load voltage, IOUTFor the direct current output terminal current, RThreadIs the impedance of the dc power cable.
The invention according to the above aspect is characterized in that, in the step (5), the voltage V of the client load at the same time is measured first1Output port voltage V of switch power supply2And current I of the client loadOUTBy passing
Obtaining the impedance of the direct current power cable; the resistance value of the digital potentiometer U5 and the impedance of the direct current power cable have unique corresponding relation, and the resistance value of the digital potentiometer U5 is obtained.
The present invention according to the above aspect is characterized in that, in the step (5), the reference VREF of the dc output voltage regulator network is changed at every moment by the following formula:
wherein, U7An output voltage in a main power loop for the client load;
IOUTis the load current;
RSsampling a resistor for a current signal in a main power loop;
k1 is the current amplification of the client load;
RU5is the resistance value of the digital potentiometer U5;
R6the voltage of a negative feedback resistor in the proportional amplifier;
R12the resistance value of the output resistor in the main power loop;
R10the resistance value of an output resistor in the inverter and the follower is obtained;
RU5and DC power cable impedance RThreadThere is a unique correspondence so that the switching power supply output voltage varies from time to time.
The invention according to the scheme has the advantages that the reference of the direct current output voltage stabilizing network is adjusted in real time by comparing the voltage and the current obtained by the switching power supply and the client load end in real time, so that the voltage of the direct current output port of the switching power supply is dynamically adjusted, and the voltage of the input port of a remote client is stabilized; the whole adjusting process is stable, the cost is low, the adjusting speed is high, stable use of a client user can be guaranteed, and the method is convenient to popularize and utilize.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a circuit diagram in an embodiment of the invention.
Fig. 3 is a circuit diagram of a network amplifier according to the present invention.
Fig. 4 is a circuit diagram of a proportional amplifier of the present invention.
FIG. 5 is a circuit diagram of an inverter and follower of the present invention.
Detailed Description
The invention is further described with reference to the following figures and embodiments:
as shown in fig. 1, a load regulation control circuit of a switching power supply includes a client load and the switching power supply, and the client load and the switching power supply are connected by a dc power cable.
The switch power supply comprises a single chip microcomputer, a digital potentiometer, a current sampling network, an error amplifier, a ratio amplifier, a direct current output voltage stabilizing network and a PLC power cable for communication; the client load comprises a single chip microcomputer, a current sampling network and a voltage sampling network.
The current signal of the switching power supply enters a proportional amplifier after being amplified by a network amplifier, the proportional amplifier is connected with an inverter and a follower, and the output ends of the inverter and the follower are superposed with the PWM signal loaded by a client to obtain the output voltage of the switching power supply.
As shown in fig. 2 and 3, the network amplifier includes a first amplifier U1-a, an output terminal of the first amplifier U1-a is connected to the proportional amplifier, and an output terminal of the first amplifier U1-a is connected to a second pin thereof through a first resistor R1, the second pin of the first amplifier U1-a is connected to the current signal of the switching power supply through a second resistor R2, a third pin of the first amplifier U1-a is connected to the current signal of the switching power supply through a third resistor R3, and the third pin of the first amplifier U1-a is connected to the common terminal through a fourth resistor R4.
In the network amplifier, an internal negative power supply-V001 is connected with a fourth pin of the first amplifier U1-A, and the internal negative power supply-V001 is connected with a common terminal after passing through a fifth capacitor C5; the internal positive supply V001 is connected to the eighth pin of the first amplifier U1-A, and the internal positive supply V001 is connected to the common terminal through a fourth capacitor C4.
As shown in fig. 2 and 4, the proportional amplifier includes a digital potentiometer U5 and a second amplifier U2, the sixth pin of the digital potentiometer U5 is connected to the network amplifier, and the sixth pin of the digital potentiometer U5 is connected to the second amplifier U2.
The seventh pin of the second amplifier U2 is connected with the sixth pin through a sixth resistor R6, the fifth pin of the second amplifier U2 is connected with the common end through a fifth resistor R5, the seventh pin of the second amplifier U2 is connected with the third pin, the first pin of the second amplifier U2 is connected with the second pin, and the first pin of the second amplifier U2 is connected with the inverter and the follower.
The fifth pin of the digital potentiometer U5 is connected with the +5V power supply through the parallel diode D, the eighth pin of the digital potentiometer U5 is connected with the +5V power supply, the eighth pin of the digital potentiometer U5 is connected with the common end after passing through the twelfth capacitor C12, and the seventh pin of the digital potentiometer U5 is connected with the common end through the fourteenth resistor R14. The fourth pin of the digital potentiometer U5 is connected to the common terminal, and the first pin thereof is connected to the common terminal through a seventeenth resistor R17. A fourth pin of the digital potentiometer U5 is connected with a third pin thereof through a thirteenth capacitor C13, and a third pin of the digital potentiometer U5 is connected with a +5V power supply through a fifteenth resistor R15; the fourth pin of the digital potentiometer U5 is connected to the second pin thereof through a fourteenth capacitor C14, and the second pin of the digital potentiometer U5 is connected to a +5V power supply through a sixteenth resistor R16.
In the second amplifier U2, the internal negative power supply-V001 is connected with the fourth pin of the second amplifier U2-A, and the internal negative power supply-V001 is connected with the common terminal after passing through a seventh capacitor C7; the +5V power supply is connected to the eighth pin of the second amplifier U2-A, and the +5V power supply is connected to the common terminal through the sixth capacitor C6.
As shown in fig. 2 and 5, the inverter and the follower include a third amplifier U3 and a fourth amplifier U4, a sixth pin of the third amplifier U3-B is connected to the proportional amplifier through a seventh resistor R7, a seventh pin of the third amplifier U3-B is connected to the sixth pin thereof through an eighth resistor R8, a seventh pin of the third amplifier U3 is connected to the third pin thereof, and a first pin of the third amplifier U3-a is connected to a second pin thereof.
The fifth pin of the fourth amplifier U4-B is connected with the PWM signal of the client load through a thirteenth resistor R13, the fifth pin of the fourth amplifier U4-B is connected with the common terminal through an eleventh capacitor C11, the seventh pin of the fourth amplifier U4-B is connected with the sixth pin thereof, and the seventh pin of the fourth amplifier U4-B is connected with the first pin of the third amplifier U3.
In the inverter and the follower, a fifth pin of a third amplifier U3-B is connected with a common end through a ninth resistor R9; the internal negative power supply-V001 is connected with a fourth pin of the third amplifier U3-A, and the internal negative power supply-V001 is connected with a common terminal after passing through a ninth capacitor C9; the +5V power supply is connected to the eighth pin of the third amplifier U3-A, and the +5V power supply is connected to the common terminal through an eighth capacitor C8.
And a first pin of the third amplifier U3-A is communicated with a seventh pin of the fourth amplifier U4-B, and the superposed pins are output to obtain the output voltage of the switching power supply. Specifically, a first pin of the third amplifier U3-A is connected with a tenth resistor R10, a seventh pin of the fourth amplifier U4-B is connected with a twelfth resistor R12, the other end of the tenth resistor R10 is connected with the other end of the twelfth resistor R12, and the connection point obtains a reference V of a voltage stabilizing network of a direct current output end through an eleventh resistor R11REFAnd the junction is connected to the common terminal via a tenth capacitor C10.
The implementation method of the load regulation control circuit of the switching power supply comprises the following steps:
(1) the client load obtains the load current and the load voltage of the client load;
(2) the switching power supply obtains the current of a direct current output end and the voltage of the direct current output end;
(3) the method comprises the following steps that a switching power supply collects load current and load voltage of a client load through a direct current power cable;
(4) the switching power supply compares the load current with the current of the direct current output end, and compares the load voltage with the voltage of the direct current output end in real time;
(5) the switching power supply adjusts the voltage of the direct current output end in real time through the following formula:
VOUT＝Vload(s)+IOUT×RThread
Wherein, VOUTFor a DC output voltage, VLoad(s)Is the load voltage, IOUTIs a direct current output terminal current, RThreadIs the impedance of the dc power cable.
In step (5), the voltage V of the client load at the same time is measured first1Output port voltage V of switch power supply2And current I of the client loadOUTBy passing
Obtaining the impedance of the direct current power cable; the resistance value of the digital potentiometer U5 and the impedance of the direct current power cable have unique corresponding relation, and the resistance value of the digital potentiometer U5 is obtained.
Reference V of voltage stabilizing network of direct current output endREFThe time of day is varied by:
wherein, U7Output voltage in the main power loop for the customer-side load, IOUTIs the load current, RSIs a current signal sampling resistor in the main power loop, K1 is the current amplification factor of the client load, RU5Is the resistance value, R, of the digital potentiometer U56Is the voltage of a degeneration resistor in a proportional amplifier, R12Is the resistance value, R, of the output resistor in the main power loop10The resistance value of the output resistor in the inverter and the follower is shown.
RU5And DC power cable impedance RThreadThere is a unique correspondence so that the switching power supply output voltage varies from time to time.
The realization principle of the circuit of the invention is as follows:
the first amplifier U2-A, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 form the main components of the network amplifier, and the current signal of the switching power supply is amplified in a signal network after passing through the network amplifier;
the second amplifiers U2-A and U2-B, the digital potentiometer U5 and the sixth resistor R6 form a proportional amplifier, and signals output by the network amplifier are amplified in proportion through the proportional amplifier;
the third amplifiers U3-A and U3-B form an inverter and a follower with equal proportion, and signals output by the proportional amplifiers are processed by the inverter and the follower;
the signal of the load client passes through a fourth amplifier U4-B and then is superposed with the output signals of the inverter and the follower to obtain a reference V of the direct current output voltage stabilizing networkREFAt this time, the reference VREFThe output voltage of the switching power supply is dynamically adjusted in real time along with the change of the load current at any moment.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
The invention is described above with reference to the accompanying drawings, which are illustrative, and it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and technical solution, or to apply the inventive concept and technical solution to other fields without modification.
Claims (5)
1. A load regulation control circuit of a switching power supply comprises a client load and the switching power supply, wherein the client load is connected with the switching power supply through a direct current power cable,
the current signal of the switching power supply enters a proportional amplifier after being amplified by a network amplifier, the proportional amplifier is connected with an inverter and a follower, and the output ends of the inverter and the follower are superposed with the PWM signal of the client load to obtain the output voltage of the switching power supply;
the realization method comprises the following steps:
(1) the client load obtains the load current and the load voltage of the client load;
(2) the switching power supply obtains the current of a direct current output end and the voltage of the direct current output end;
(3) the switching power supply collects load current and load voltage of the client load through a direct current power cable;
(4) the switching power supply compares the load current with the direct current output end current, and compares the load voltage with the direct current output end voltage in real time;
(5) the switching power supply adjusts the voltage of the direct current output end in real time according to the following formula:
VOUT＝Vload(s)+IOUT×RThread
Wherein, VOUTFor the dc output voltage, VLoad(s)Is the load voltage, IOUTIs that the straightCurrent of the current output terminal, RThreadIs the impedance of the dc power cable;
in the step (5), the reference VREF of the voltage stabilizing network at the direct current output end changes at any moment according to the following formula:
wherein, U7An output voltage in a main power loop for the client load;
IOUTis the load current;
RSsampling a resistor for a current signal in a main power loop;
k1 is the current amplification of the client load;
RU5is the resistance value of the digital potentiometer U5;
R6the voltage of a negative feedback resistor in the proportional amplifier;
R12the resistance value of the output resistor in the main power loop;
R10the resistance value of an output resistor in the inverter and the follower is obtained;
RU5and DC power cable impedance RThreadThere is a unique correspondence so that the switching power supply output voltage varies from time to time.
2. The load regulation control circuit of claim 1 wherein the network amplifier comprises a first amplifier U1-A, the output of the first amplifier U1-A is connected to the proportional amplifier, the output of the first amplifier U1-A is connected to the second pin of the first amplifier U1 through a first resistor R1, the second pin of the first amplifier U1-A is connected to the current signal of the switching power supply through a second resistor R2, the third pin of the first amplifier U1-A is connected to the current signal of the switching power supply through a third resistor R3, and the third pin of the first amplifier U1-A is connected to the common terminal through a fourth resistor R4.
3. The load regulation control circuit of claim 1, wherein the proportional amplifier comprises a digital potentiometer U5 and a second amplifier U2, the sixth pin of the digital potentiometer U5 is connected to the network amplifier, the sixth pin of the digital potentiometer U5 is connected to the second amplifier U2;
the seventh pin of the second amplifier U2 is connected with the sixth pin thereof through a sixth resistor R6, the fifth pin of the second amplifier U2 is connected with the common end through a fifth resistor R5, the seventh pin of the second amplifier U2 is connected with the third pin thereof, the first pin of the second amplifier U2 is connected with the second pin thereof, and the first pin of the second amplifier U2 is connected with the inverter and the follower.
4. The load regulation control circuit of claim 1, wherein the inverter and follower comprise a third amplifier U3 and a fourth amplifier U4, the sixth pin of the third amplifier U3 is connected to the proportional amplifier via a seventh resistor R7, the seventh pin of the third amplifier U3 is connected to the sixth pin thereof via an eighth resistor R8, the seventh pin of the third amplifier U3 is connected to the third pin thereof, and the first pin thereof is connected to the second pin thereof;
a fifth pin of the fourth amplifier U4 is connected with the PWM signal of the client load through a thirteenth resistor R13, and a fifth pin of the fourth amplifier U4 is connected to the common terminal through an eleventh capacitor C11, a seventh pin of the fourth amplifier U4 is connected to a sixth pin thereof, and a seventh pin of the fourth amplifier U4 is connected to a first pin of the third amplifier U3;
and a first pin of the third amplifier U3 is communicated with a seventh pin of the fourth amplifier U4 and is superposed to output the superposed voltage to obtain the output voltage of the switching power supply.
5. The load regulation control circuit of claim 1, wherein in step (5), the client end negative at the same time is first measuredVoltage V of load1Output port voltage V of switch power supply2And current I of the client loadOUTBy passing
Obtaining the impedance of the direct current power cable; the resistance value of the digital potentiometer U5 and the impedance of the direct current power cable have unique corresponding relation, and the resistance value of the digital potentiometer U5 is obtained.
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| CN201910178655.0A CN109951075B (en) | 2019-03-11 | 2019-03-11 | Load regulation control circuit of switching power supply and implementation method thereof |
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| CN201910178655.0A CN109951075B (en) | 2019-03-11 | 2019-03-11 | Load regulation control circuit of switching power supply and implementation method thereof |
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| CN109951075B true CN109951075B (en) | 2020-11-10 |
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| US8232785B2 (en) * | 2007-11-26 | 2012-07-31 | Igo, Inc. | System and method using a current mirror to program an output voltage and current |
| CN104333221A (en) * | 2014-10-23 | 2015-02-04 | 中山大学 | Adaptive line loss compensation circuit for DC-DC (direct current) converter |
| CN106325343B (en) * | 2015-06-18 | 2017-11-28 | 宏碁股份有限公司 | Power supply device with wire voltage drop compensation |
| CN105429460B (en) * | 2015-12-31 | 2019-01-25 | 无锡华润矽科微电子有限公司 | DC-DC converter with line loss compensation |
| CN107300940A (en) * | 2017-05-18 | 2017-10-27 | 深圳市核达中远通电源技术有限公司 | A kind of communication class Switching Power Supply VD dynamic regulation control method |
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