CN110635469B - Parallel power expansion circuit and method - Google Patents
Parallel power expansion circuit and method Download PDFInfo
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- CN110635469B CN110635469B CN201910970203.6A CN201910970203A CN110635469B CN 110635469 B CN110635469 B CN 110635469B CN 201910970203 A CN201910970203 A CN 201910970203A CN 110635469 B CN110635469 B CN 110635469B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
Abstract
The invention discloses a parallel power expansion circuit and a method, which relate to the field of direct-current power supply design, and the circuit comprises: the current sampling module is used for sampling the input current or the output current of the main power supply in real time, amplifying and comparing the sampled current signals and outputting the sampled current signals to the voltage following current control module, and the voltage following current control module outputs corresponding regulation and control signals to the auxiliary power supply regulation and control end according to the input signals and the reference voltage provided by the main power supply so as to realize that the auxiliary power supply outputs the voltage same as the main power supply and provides the current of which the load end is greater than a preset threshold value so as to realize the power expansion of the main power supply. The invention can realize the automatic parallel connection of the main power supply and the auxiliary power supply according to actual needs, ensures the stable output voltage of the main power supply and realizes power expansion at the same time, and has the advantages of no response time delay, stable control, low system complexity and wide application range.
Description
Technical Field
The invention relates to the field of direct-current power supply design, in particular to a parallel power expansion circuit and a method.
Background
The design of the parallel power supply system has many difficulties, the synchronization of the dual voltage regulating loop and the internal resistance are small, the voltage is inconsistent due to the limitation of the process level and the unavailability of errors, and the modules participating in the parallel connection in the actual system are directly connected in parallel, so that the uniformity of the module current cannot be ensured, and the stability and the reliability of the system are seriously influenced. In order to solve the above problems, in the conventional method, the a module and the B module are switched back and forth according to different working states, each module has a corresponding current and voltage control and protection circuit, and the control circuit is complex and repeated. Furthermore, due to the diversity of the load conditions, a power supply system is required to have a plurality of output voltage gears, and it is difficult to realize the voltage synchronization adjustment of the power supply module.
Therefore, there is a need to design a parallel power spreading circuit and method to provide a solution to the control problem of two power sources in parallel.
Disclosure of Invention
In order to solve the problems in the prior art, the embodiment of the invention provides a parallel power expansion circuit and a method which are stable in control and uniform in current and can meet various application scenarios.
The technical scheme provided by the invention for the technical problem is as follows:
in one aspect, an embodiment of the present invention provides a parallel power spreading circuit, where the circuit includes:
main power module, with the main power module output directly or through switch parallel connection's supplementary power module, main power module, supplementary power module parallel power supply still include: the power expansion module is respectively connected with the main power supply module and the auxiliary power supply module and used for sampling the input or output current of the main power supply module in real time, regulating and controlling the output voltage of the auxiliary power supply according to the input or output current of the main power supply module, distributing the output current of the auxiliary power supply module, and further establishing current negative feedback to enable the main power supply module to output current according to a preset threshold value, so that the output voltage of the main power supply module is stabilized and power expansion is obtained;
wherein the power spreading module comprises: the current sampling module is connected with the voltage following current control module; the current sampling module is connected with the main power supply module, and the voltage following current control module is connected with the output end of the main power supply module and the regulation and control end of the auxiliary power supply module; the current sampling module is used for sampling the input or output current of the main power supply module in real time, amplifying and comparing the sampled current and transmitting the amplified and compared sampled current to the voltage following current control module; the voltage following current control module is used for monitoring the output voltage of the main power supply, regulating the output voltage of the auxiliary power supply to be slightly lower than the voltage of the main power supply, controlling the output current of the auxiliary power supply to follow the change according to the change of the sampling current, and establishing a current negative feedback of 'main power supply-auxiliary power supply-main power supply' to further regulate the current of the main power supply to be lower than or equal to a preset threshold value so as to expand the output current of the main power supply.
The voltage-following current control module Is used for controlling the output current I2 of the auxiliary power supply to increase when the input or output current I1 of the main power supply Is monitored to be larger than a preset threshold value according to the sampling current Is, adjusting the current I1 of the main power supply to be lower than or equal to the preset threshold value through current negative feedback, and automatically connecting the main power supply in parallel with the auxiliary power supply to realize power expansion of the main power supply;
when the voltage-following current control module monitors that the input or output current I1 of the main power supply Is smaller than or equal to a preset threshold value according to the sampling current Is, the voltage-following current control module controls the output current I2 of the auxiliary power supply to be reduced, the maintaining current Is equal to the preset threshold value, when the current of the main power supply Is smaller than the preset threshold value, the auxiliary power supply does not provide current for the load any more, the main power supply and the auxiliary power supply are automatically disconnected and connected in parallel, and only the main power supply provides power for the load;
wherein the sum of the main power module current I1 and auxiliary power module current I2 is equal to the load current I; when the main power supply has no current, the auxiliary power supply can not provide current for the load;
wherein, the current sampling module includes: a first resistor, a second resistor, a third resistor, a tenth resistor, a second capacitor, a third capacitor, a first battery and a first integrated circuit, the first integrated circuit is a current sensing amplifier, the negative electrode of the first battery is grounded SGND, the positive electrode of the first battery is connected with the main power supply module through a first resistor, the pin 1 of the first integrated circuit is connected with the pin 2 of the first integrated circuit and grounded SGND, the pin 3 of the first integrated circuit is connected with an output port and grounded through the second capacitor, the pin 4 of the first integrated circuit is connected with the positive electrode of a first battery through the second resistor, the pin 5 of the first integrated circuit is connected with a main power supply module through the third resistor, the pin 3 of the first integrated circuit is connected with the pin 5 of the first integrated circuit through the tenth resistor and the third capacitor which are connected in series, and the pin 3 of the first integrated circuit is directly connected with a rear-stage circuit; the first integrated circuit is used for sampling the input or output current of the main power supply module in real time, amplifying and comparing the sampled current and transmitting the amplified and compared sampled current to the post-stage circuit;
wherein the voltage-following current control module comprises: a fourth resistor, a fifth resistor, a sixth resistor, a twelfth resistor, a thirteenth resistor, a second integrated circuit, a first triode and a fourth capacitor, wherein the second integrated circuit is a controllable precise voltage-stabilizing source, the twelfth resistor and the thirteenth resistor are connected in parallel and are grounded, the connecting point of the first integrated circuit is connected with a pin 6 of the first integrated circuit in the current sampling module, the R pole of the second integrated circuit is connected with the sixth resistor and the twelfth resistor, the K pole of the second integrated circuit is connected with one end of the fourth resistor and the fourth capacitor, the A pole of the second integrated circuit is connected with the other end of the fourth capacitor and is grounded SGND, the B pole of the first triode is connected with the fifth resistor and the sixth resistor, the E pole of the first triode is connected with the fourth capacitor, the C pole of the first triode is connected with the rear-stage circuit, and the fourth resistor is connected with the fifth resistor and is connected with the rear-stage circuit and the main power supply output end; the twelfth resistor and the thirteenth resistor are used for receiving sampling current, and the fourth resistor and the first triode are used for controlling the post-stage circuit according to the sampling current;
wherein the voltage-following current control module further comprises: the integrated circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, an eleventh resistor, a first capacitor and a third integrated circuit, wherein the eighth resistor and the ninth resistor are connected in parallel and grounded SGND, the third integrated circuit is a controllable precise voltage-stabilizing source, the eighth resistor is connected with the fourth resistor in a preceding circuit, the R pole of the third integrated circuit is connected with the connection point of the eighth resistor and the ninth resistor and is connected with the C pole of the third integrated circuit through the seventh resistor and the first capacitor, the K pole of the third integrated circuit is connected with the auxiliary power supply module, and the A pole of the third integrated circuit is connected with the C pole of the first triode in the preceding circuit and is grounded SGND through the eleventh resistor; the third integrated circuit is used for controlling the output voltage and current of the auxiliary power supply module;
wherein the circuit further comprises a communication voltage regulation circuit for regulating the mains supply voltage in accordance with load requirements.
In another aspect, an embodiment of the present invention provides a parallel power spreading method, where the method includes:
monitoring the output voltage of the main power supply module in real time and sampling the input or output current of the main power supply module in real time;
regulating and controlling the output voltage of the auxiliary power supply to be synchronous according to the output voltage of the main power supply and the sampling current;
controlling the output current of the auxiliary power supply module to follow the change according to the change of the sampling current;
the output current of the auxiliary power supply module adjusts the current of the main power supply module to be lower than or equal to a preset threshold value through current negative feedback so as to ensure that the power is linearly expanded on the premise of ensuring the stability of the output voltage of the main power supply.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a parallel power expansion circuit and a method, wherein two power supplies are divided into a main power supply and an auxiliary power supply, the main power supply provides guide voltage and is controlled by main power supply current, current sampling is used for input or output current of the main power supply, the follow-up control of output voltage and current of the auxiliary power supply is realized according to the change of the sampling current, and then the current negative feedback mechanism of the output current of the auxiliary power supply is used for adjusting the change of the main power supply current, so that the output current of the main power supply does not exceed a preset threshold, the output current of the auxiliary power supply is increased when the load current exceeds the preset threshold, the automatic parallel connection of the auxiliary power supply and the main power supply is realized, and the main power supply and the auxiliary power supply jointly supply power to a load, thereby ensuring the stable output voltage of the main power supply and realizing the power expansion of the main power supply. The invention solves the problems of the traditional A-B power supply switching control electrical complexity and repeatability, and the problems of uneven current of each module in a parallel power supply system and serious influence on the stability and reliability of the system, realizes the parallel voltage synchronization and current balance control of the power supply, and is a novel economic and reliable power supply control circuit. The method has the advantages of no response delay, stable control, low system complexity and wide application range.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a system block diagram of a parallel power spreading circuit according to an embodiment of the present invention;
fig. 2a is a schematic circuit diagram of a parallel power spreading circuit for sampling a main power input current according to an embodiment of the present invention;
fig. 2b is a schematic circuit diagram of a parallel power spreading circuit for sampling current at a main power supply according to an embodiment of the present invention;
fig. 3 is a detailed schematic diagram of a parallel power spreading method according to an embodiment of the present invention;
fig. 4 is a flowchart of a parallel power spreading method according to a second embodiment of the present invention.
Detailed Description
In order to solve the technical problems of control electrical complexity and repeatability of back-and-forth switching of A-B power supplies and uneven current of each module in a parallel power supply system in the prior art, the invention aims to provide a parallel power expansion circuit and a method, and the core idea of the parallel power expansion circuit is as follows: designing a control mode, wherein a voltage regulating circuit control module is divided into two automatic control modes according to the current change of a main power supply, when the current of the main power supply is larger than a preset threshold value, a voltage following current control module outputs a corresponding regulation and control signal to an auxiliary power supply regulation and control end according to an input signal and a reference voltage provided by the main power supply so as to realize that the auxiliary power supply outputs the same voltage as the main power supply, controls the output current of the auxiliary power supply to increase, and provides the current of a load end larger than the preset threshold value so as to realize the power expansion of the main power supply; when the current of the main power supply is not larger than a preset threshold value, the voltage following current control module controls the output current of the auxiliary power supply to be reduced according to the current sampling result of the main power supply, and the main power supply supplies power to the load. The design avoids the uneven current of each module in the parallel power supply system and the control electrical complexity and repeatability of the back-and-forth switching of the common A-B power supply for solving the problem. Furthermore, the current regulation and control proportion can be set differently according to different applications, the control system is in analog connection, the parallel connection process of the two power supplies is free of overshoot, and the control is stable. By the circuit and the method, the technical problem of uneven current of each module in a parallel power supply system can be effectively solved, and the circuit and the method have the advantages of no response delay, stable control, low system complexity and wide application range.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The embodiment of the invention provides a parallel power expansion circuit, which is particularly suitable for the field of direct-current power supply design, and referring to fig. 1, the circuit comprises:
main power module, with the main power module output directly or through switch parallel connection's supplementary power module, main power module, supplementary power module parallel power supply still include: and the power expansion module is respectively connected with the main power supply module and the auxiliary power supply module and is used for sampling the input or output current of the main power supply module in real time, regulating and controlling the output voltage of the auxiliary power supply according to the input or output current of the main power supply module, distributing the output current of the auxiliary power supply module, and further establishing current negative feedback to enable the main power supply module to output current according to a preset threshold value, so that the output voltage of the main power supply module is stabilized and power expansion is obtained.
In this embodiment, referring to fig. 1, the main power source is connected in parallel with the auxiliary power source, the input end is an external power source input end, the output end is a load, and a power expansion module is connected between the main power source and the auxiliary power source. The power expansion module samples the input or output current of the main power supply module in real time and monitors the output voltage of the main power supply module, regulates the output voltage of the auxiliary power supply module according to the sampled current and the output voltage of the main power supply module, controls the output voltage of the auxiliary power supply module to be synchronous with the output voltage of the main power supply module, controls the output current of the auxiliary power supply module to follow the input or output current of the main power supply module, further adjusts the output current of the main power supply to be below or equal to a preset threshold value through negative feedback, and enables a load to obtain the required current which is larger than the preset threshold value, so that the power expansion of the main power supply module is realized. The invention adopts a current and current negative feedback mechanism, a main power supply is used as a control end, the actual working state of the circuit is mapped to the main power supply control, the output current of an auxiliary power supply is controlled through the main power supply current, current negative feedback is further established, the output change of the auxiliary power supply further influences the output change of the main power supply used as the control end so as to finally reach current balance, and the control system is in analog connection, the parallel connection process of the two power supplies has no overshoot, and the control is stable. Furthermore, two power supplies are sampled and protected to form a set of circuit, no-difference parallel connection is achieved, the current of the input end of the main power supply serves as a regulation end, and the load capacity of the main power supply can be controlled simultaneously.
The power spreading module includes: the current sampling module is connected with the voltage following current control module; the current sampling module is connected with the main power supply module, and the voltage following current control module is connected with the output end of the main power supply module and the regulation and control end of the auxiliary power supply module; the current sampling module is used for sampling the input or output current of the main power supply module in real time, amplifying and comparing the sampled current and transmitting the amplified and compared sampled current to the voltage following current control module; the voltage following current control module is used for monitoring the output voltage of the main power supply, regulating the output voltage of the auxiliary power supply to be slightly lower than the voltage of the main power supply, controlling the output current of the auxiliary power supply to follow the change according to the change of the sampling current, and establishing a current negative feedback of 'main power supply-auxiliary power supply-main power supply' to further regulate the current of the main power supply to be lower than or equal to a preset threshold value so as to expand the output current of the main power supply.
In this embodiment, referring to fig. 2a, the power expansion module includes a current sampling module and a voltage-following current control module connected to the current sampling module, the current sampling module is connected to the main power module, and the voltage-following current control module is connected to an output end of the main power module and a regulation end of the auxiliary power module; the current sampling module is used for sampling the input or output current of the main power supply module in real time, when the current output to the load by the main power supply is changed, the sampling current is correspondingly changed and is amplified and compared by the current sampling module and then is output to the voltage following current control module, the voltage following current control module outputs a corresponding regulation signal to the auxiliary power supply regulation and control end according to the input signal and the reference voltage provided by the main power supply so as to realize that the auxiliary power supply outputs the same voltage as the main power supply, and sends a control current with reverse change according to the change of the sampling current to enable the output current of the auxiliary power supply module to follow the change of the sampling current in the same direction, furthermore, as the load current is constant, the auxiliary power supply and the main power supply current change in the same direction, based on a current negative feedback mechanism, the change of the main power supply output current is regulated, and finally the output current of the main power supply module is not higher than a preset threshold value, the load gets a current above a preset threshold. The design realizes the power expansion of the main power supply by the main power supply, does not need a complex control circuit, regulates the auxiliary power supply by using the input current of the main power supply, leads the current of the auxiliary power supply to follow the current of the main power supply, can make different settings according to different applications, is suitable for various scenes and has very wide application range. Furthermore, the power expansion module is a pure analog circuit, does not use a single chip microcomputer or any type of processor, has strong real-time performance and certainty, and is quick in response, free of break points and high in working efficiency.
The voltage following current control module Is used for controlling the output current I2 of the auxiliary power supply to increase when the input or output current I1 of the main power supply Is monitored to be larger than a preset threshold value according to the sampling current Is, adjusting the current I1 of the main power supply to be lower than or equal to the preset threshold value through current negative feedback, and automatically connecting the main power supply in parallel with the auxiliary power supply to realize power expansion of the main power supply.
In this embodiment, referring to fig. 2a and fig. 2b, the voltage-follower-current control module obtains a change of the input or output current I1 of the main power source through the sampling current Is provided by the current sampling module, when the current I1 Is greater than a preset threshold, the voltage-follower-current control module controls the output current of the auxiliary power source to increase, and since the load current Is the sum of the main power source current and the auxiliary power source current, the output current of the auxiliary power source adjusts the main power source output current to be less than or equal to the preset threshold through a negative feedback mechanism, and at this moment, the main power source Is automatically connected in parallel with the auxiliary power source, so as to implement power source power expansion. The design takes the input end current of the main power supply as a regulation end, and can simultaneously control the loading capacity of the main power supply.
The voltage following current control module Is used for controlling the output current I2 of the auxiliary power supply to be reduced when the input or output current I1 of the main power supply Is monitored to be smaller than or equal to a preset threshold value according to the sampling current Is, maintaining the current to be equal to the preset threshold value, when the current of the main power supply Is smaller than the preset threshold value, the auxiliary power supply does not provide current for the load any more, the main power supply and the auxiliary power supply are automatically disconnected and connected in parallel, and only the main power supply provides power for the load.
In this embodiment, referring to fig. 2a and fig. 2b, the voltage-follower-current control module obtains a change of the input or output current I1 of the main power source through the sampling current Is provided by the current sampling module, when the current I1 Is smaller than a preset threshold, the voltage-follower-current control module controls the output current of the auxiliary power source to decrease, the holding current Is equal to the preset threshold, and when the current of the main power source Is smaller than the preset threshold, since the load current Is the sum of the current of the main power source and the current of the auxiliary power source, the auxiliary power source no longer provides current for the load, at this time, the main power source and the auxiliary power source are automatically disconnected in parallel, and only the main power source provides power for the load. The design takes the input end current of the main power supply as a regulation end, and can simultaneously control the loading capacity of the main power supply.
The sum of the main power module current I1 and auxiliary power module current I2 is equal to load current I; when the main power supply is currentless, the auxiliary power supply can not provide current for the load.
In this embodiment, referring to fig. 2a, the main power module and the auxiliary power module are connected in parallel, the input terminals are external power input, the parallel output terminal supplies power to the load, when the load current I is constant, the sum of the main power module current I1 and the auxiliary power module current I2 is constantly equal to the load current I, and the changes of the two are in negative correlation, thereby forming a current negative feedback. When the main power supply is currentless, the auxiliary power supply can not provide current for the load, so that the auxiliary power supply can not supply power when the main power supply is turned off, the condition that the parallel power supply still supplies power when the load does not need to supply power is avoided, and the reasonable control of power output is realized.
The current sampling module includes: a first resistor R1, a first resistor R2, a first resistor R3, a first resistor R10, a second capacitor C2, a third capacitor C3, a first battery BT1 and a first integrated circuit IC1, wherein the first integrated circuit IC1 is a current-sensing amplifier, the negative pole of the first battery BT1 is grounded SGND, the positive pole of the first battery BT1 is connected with the main power supply module through a first resistor R1, the 1 pin of the first integrated circuit IC1 is connected with the 2 pin of the first integrated circuit IC1 and grounded SGND, the 3 pin of the first integrated circuit IC1 is connected with an output port and grounded through the second capacitor C2, the 4 pin of the first integrated circuit IC1 is connected with the positive pole of the first battery 1 through the first resistor R2, the 5 pin of the first integrated circuit IC1 is connected with the module through the first resistor R3, the positive pole of the first integrated circuit IC 6863 is connected with the positive pole of the first battery 1 through the first resistor R867 and the third integrated circuit IC 87458, and the 3 pin of the first integrated circuit IC1 is directly connected to the subsequent stage circuit; the first integrated circuit IC1 is used for sampling the input or output current of the main power supply module in real time, amplifying and comparing the sampled current and transmitting the amplified and compared sampled current to the post-stage circuit.
In this embodiment, referring to fig. 3, the current sampling module includes: a first resistor R1, a first resistor R2, a first resistor R3, a first resistor R10, a second capacitor C2, a third capacitor C3, a first battery BT1, and a first integrated circuit IC1, wherein the first integrated circuit IC1 is a current sense amplifier and is connected in the following manner: the negative electrode of the first battery BT1 is grounded SGND, the positive electrode of the first battery BT1 is connected to the main power module through a first resistor R1, pin 1 of the first integrated circuit IC1 is connected to pin 12 of the first integrated circuit IC and is grounded SGND, pin 3 of the first integrated circuit IC1 is connected to an output port and is grounded through the second capacitor C2, pin 4 of the first integrated circuit IC1 is connected to the positive electrode of a first battery BT1 through the first resistor R2, pin 5 of the first integrated circuit IC1 is connected to the main power module through the first resistor R3, pin 3 of the first integrated circuit IC1 is connected to pin 5 of the first integrated circuit IC1 through the first resistor R10 and a third capacitor C3 which are connected in series, and pin 3 of the first integrated circuit IC1 is directly connected to a post-stage circuit, wherein the post-stage circuit is a voltage follower current control circuit; when the main power current I1 increases, the voltage U of pin 4 of the first integrated circuit IC1INIncreasing the voltage U of the 6-pin output end after amplification and comparisonOUTIncreasing, when the main supply current I1 decreases, the voltage U at pin 14 of the first integrated circuit ICINThe voltage U of the 6 pins of the output end is reduced after amplification and comparisonOUTDecreasing, the first integrated circuit IC1 makes its own output voltage by current samplingThe sampling current is changed along the same direction, and the subsequent stage circuit is controlled to operate correspondingly. The current sampling has real-time performance, can quickly respond according to the current change of the main power supply, efficiently control the subsequent operation,
the voltage-following current control module includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a twelfth resistor R12, a thirteenth resistor R13, a second integrated circuit IC2, a first triode Q1 and a fourth capacitor C4, wherein the second integrated circuit IC2 is a controllable precise voltage-stabilizing source, the twelfth and thirteenth resistors are connected in parallel and grounded, the connection point of the twelfth and thirteenth resistors is connected to the pin 6 of the first integrated circuit IC1 in the current sampling module, the R pole of the second integrated circuit IC2 is connected to the sixth resistor R6 and the twelfth resistor R12, the K pole of the second integrated circuit IC2 is connected to one end of the fourth resistor R4 and the fourth capacitor C4, the A pole of the second integrated circuit IC2 is connected to the other end of the fourth capacitor C4 and grounded SGND, the B pole of the first triode Q1 is connected to the fifth resistor R5 and the sixth resistor R6, the E pole of the first triode Q1 is connected to the fourth capacitor C8653 and the rear pole of the fourth capacitor C8653, the fourth resistor R4 is connected with the fifth resistor R5 and is connected with the post-stage circuit and the main power supply output end; the twelfth resistor R12 and the thirteenth resistor R13 are used for receiving sampling current, and the fourth resistor R4 and the first triode Q1 are used for controlling a post-stage circuit according to the sampling current.
In this embodiment, referring to fig. 3, the voltage-following current control module comprises: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a twelfth resistor R12, a thirteenth resistor R13, a second integrated circuit IC2, a first triode Q1 and a fourth capacitor C4, wherein the second integrated circuit IC2 is a controllable precision voltage regulator and is connected in the following manner: the twelfth resistor and the thirteenth resistor are connected in series and grounded, the connection point of the twelfth resistor and the thirteenth resistor is connected to the pin 6 of the first integrated circuit IC1 in the current sampling module, the 2-pole of the second integrated circuit IC2R is connected to the sixth resistor R6 and the twelfth resistor R12, the K-pole of the second integrated circuit IC2 is connected to one end of the fourth resistor R4 and the fourth capacitor C4, the a-pole of the second integrated circuit IC2 is connected to the other end of the fourth capacitor C4 and grounded SGND, and the B-pole of the first triode Q1 is connected to the groundThe fifth resistor R5 and the sixth resistor R6, the E pole of the first triode Q1 is connected with the fourth capacitor C4, the C pole of the first triode Q1 is connected with the post-stage circuit, and the fourth resistor R4 and the fifth resistor R5 are connected with the post-stage circuit and the main power supply output end; when the first IC1 outputs the voltage U at pin 6OUTWhen the voltage of the connection point of the twelfth resistor R12 and the thirteenth resistor R13 is increased, the voltage transmitted to the R pole of the second integrated circuit IC2 is increased, the current of the second integrated circuit IC2 is increased, and the current of the first triode Q1 is increased; when the first IC1 outputs the voltage U at pin 6OUTWhen the voltage of the connection point of the twelfth resistor R12 and the thirteenth resistor R13 is reduced, the voltage transmitted to the R pole of the second integrated circuit IC2 is reduced, the current of the second integrated circuit IC2 is reduced, and the current of the first triode Q1 is reduced; the circuit structure can control the voltage change of the C electrode of the first triode Q1 and the fourth resistor R4 output to the rear-stage circuit according to the output voltage change of the first integrated circuit IC1 in the front-stage circuit, so as to realize further control.
The voltage-following current control module further includes: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, an eleventh resistor R11, a first capacitor C1 and a third integrated circuit IC3, wherein the eighth and ninth resistors R9 are connected in parallel and grounded to SGND, the third integrated circuit IC3 is a controllable precision voltage-stabilized source, the eighth resistor R8 is connected to the fourth resistor R4 in the previous stage circuit, the R pole of the third integrated circuit IC3 is connected to the connection point of the eighth and ninth resistors R9 and is connected to the C pole of the third integrated circuit IC 3683 through the seventh resistor R7 and the first capacitor C1, the K pole of the third integrated circuit IC3 is connected to the auxiliary power module, and the a pole of the third integrated circuit IC3 is connected to the C pole of the first triode Q1 in the previous stage circuit and is grounded to SGND through the eleventh resistor R11; the third integrated circuit IC3 is used to control the output voltage and current of the auxiliary power supply module.
In this embodiment, referring to fig. 3, the voltage regulating circuit control module further includes: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, an eleventh resistor R11, a first capacitor C1 and a third integrated circuit IC3, wherein the connection modes are as follows: the eighth resistor R9 and the ninth resistor R9 are connected in parallel and grounded SGND, the third integrated circuit IC3 is a controllable precision voltage regulator, the eighth resistor R8 is connected to the fourth resistor R4 in the front-stage circuit, the R pole of the third integrated circuit IC3 is connected to the connection point of the eighth resistor R9 and the ninth resistor R9, and is connected to the C pole of the third integrated circuit IC3 through the seventh resistor R7 and the first capacitor C1, the K pole of the third integrated circuit IC3 is connected to the auxiliary power module, and the a pole of the third integrated circuit IC3 is connected to the C pole of the first triode Q1 in the front-stage circuit and is grounded SGND through the eleventh resistor R11; when the voltage output from the pin C of the first triode Q1 of the previous stage circuit to the eleventh resistor R11 rises, the current of the third integrated circuit IC3 becomes small, the output current of the auxiliary power supply module is controlled to become large, and when the voltage output from the pin C of the first triode Q1 of the previous stage circuit to the eleventh resistor R11 falls, the current of the third integrated circuit IC3 becomes large, and the output current of the auxiliary power supply module is controlled to decrease. The circuit structure realizes that the output current of the auxiliary power supply module is controlled to change along with the change according to the change of the output voltage of the preceding stage circuit, and in addition, the third integrated circuit IC3 regulates and controls the output voltage of the auxiliary power supply to be synchronous with the output voltage of the main power supply according to the voltage output to the eleventh resistor R11 by the pin C of the first triode Q1 of the preceding stage circuit and the output voltage of the main power supply obtained by the eighth resistor R8. Furthermore, from the view of the whole circuit, the synchronization of the output voltage of the auxiliary power supply and the output voltage of the main power supply is realized, the output current of the auxiliary power supply module changes along the same direction of the current of the main power supply, and then the current change of the auxiliary power supply module adjusts the current change of the main power supply through a current negative feedback mechanism, so that the output current of the main power supply is not higher than a preset threshold value. The design ensures that the output voltage of the main power supply is stable, and simultaneously realizes the power expansion of the main power supply.
The circuit also includes a communication regulator circuit for regulating the main supply voltage in accordance with load requirements.
In this embodiment, in a specific application, for example, a PD QC communication which is popular at present, the communication voltage regulating circuit regulates the main power supply voltage according to the load requirement by communicating with a load end protocol IC, so as to meet the requirements of different loads.
Example two
The invention provides a parallel power spreading method, which comprises the following steps:
monitoring the output voltage of the main power supply module in real time and sampling the input or output current of the main power supply module in real time;
regulating and controlling the output voltage of the auxiliary power supply to be synchronous according to the output voltage of the main power supply and the sampling current;
controlling the output current of the auxiliary power supply module to follow the change according to the change of the sampling current;
the output current of the auxiliary power supply module adjusts the current of the main power supply module to be lower than or equal to a preset threshold value through current negative feedback so as to ensure that the power is linearly expanded on the premise of ensuring the stability of the output voltage of the main power supply.
In this embodiment, referring to fig. 4, with reference to fig. 2a, first, the voltage-follower-current control circuit monitors the output voltage of the main power source in real time, the current sampling module samples the input or output current of the main power source in real time, the voltage-follower-current control circuit regulates and controls the output voltage of the auxiliary power source to be synchronous with the output voltage of the main power source according to the result of the voltage-follower-current control circuit on the output voltage of the main power source and the sampling result transmitted from the current sampling module, and then the output current of the auxiliary power supply module is controlled to follow the change in the same direction according to the change of the sampling current, specifically, when the output current of the main power supply is larger than the preset threshold value, the output current of the auxiliary power supply is increased along with the increase of the output current of the main power supply, the output current of the main power supply is further adjusted to be not larger than the preset threshold value through a feedback mechanism, meanwhile, the current which is larger than a preset threshold value and is required can be provided for the load, and the power expansion of the main power supply is realized while the stability of the output voltage of the main power supply is ensured. The design of the step avoids the uneven current of each module in the parallel power supply system and the control electrical complexity and repeatability of the back-and-forth switching of the common A-B power supply for solving the problem. Furthermore, the current regulation and control proportion can be set differently according to different applications, and the method is suitable for various scenes. By the method, the technical problem of uneven current of each module in the parallel power supply system can be effectively solved, and the method has the advantages of no response delay, stable control, low system complexity and wide application range.
It should be noted that the parallel power expansion circuit and the method belong to the same inventive concept. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. Each parameter adopted in the embodiment of the present invention is only an example, and different parameter values need to be set according to a specific application scenario.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a parallelly connected power expander circuit, includes main power module, with the main power module output directly or through switch parallel connection's supplementary power module, main power module, supplementary power module parallel power supply, its characterized in that still includes:
the power expansion module is respectively connected with the main power supply module and the auxiliary power supply module and used for sampling the input or output current of the main power supply module in real time, regulating and controlling the output voltage of the auxiliary power supply according to the input or output current of the main power supply module, distributing the output current of the auxiliary power supply module, and further establishing current negative feedback to enable the main power supply module to output current according to a preset threshold value, so that the output voltage of the main power supply module is stabilized and power expansion is obtained;
the power spreading module includes: the current sampling module is connected with the voltage following current control module; the current sampling module is connected with the main power supply module, and the voltage following current control module is connected with the output end of the main power supply module and the regulation and control end of the auxiliary power supply module;
the current sampling module is used for sampling the input or output current of the main power supply module in real time, amplifying and comparing the sampled current and transmitting the amplified and compared sampled current to the voltage following current control module;
the voltage following current control module is used for monitoring the output voltage of the main power supply, regulating the output voltage of the auxiliary power supply to be slightly lower than the voltage of the main power supply, controlling the output current of the auxiliary power supply to follow the change according to the change of the sampling current, and establishing a current negative feedback of 'main power supply-auxiliary power supply-main power supply' to further regulate the current of the main power supply to be lower than or equal to a preset threshold value so as to expand the output current of the main power supply.
2. The parallel power expansion circuit of claim 1, wherein the voltage-follower-current control module Is configured to control the output current I2 of the auxiliary power supply to increase when the input or output current I1 of the main power supply Is monitored to be greater than a preset threshold according to the sampling current Is, and adjust the current I1 of the main power supply to be lower than or equal to the preset threshold through current negative feedback, so that the main power supply Is automatically connected in parallel with the auxiliary power supply to achieve power expansion of the main power supply.
3. The parallel power spreading circuit of claim 2, wherein the voltage-follower-current control module Is configured to control the output current I2 of the auxiliary power supply to decrease when the input or output current I1 of the main power supply Is monitored to be less than or equal to a preset threshold according to the sampling current Is, and maintain the current to be equal to the preset threshold, and when the current of the main power supply Is less than the preset threshold, the auxiliary power supply no longer provides current for the load, and the main power supply and the auxiliary power supply are automatically disconnected from being connected in parallel, and only the main power supply provides power for the load.
4. The parallel power spreading circuit of claim 3, wherein the sum of the main power module current I1 and auxiliary power module current I2 is equal to a load current I; when the main power supply is currentless, the auxiliary power supply can not provide current for the load.
5. The parallel power spreading circuit of any of claims 1-4, wherein the current sampling module comprises: a first resistor, a second resistor, a third resistor, a tenth resistor, a second capacitor, a third capacitor, a first battery and a first integrated circuit, the first integrated circuit is a current sensing amplifier, the negative electrode of the first battery is grounded SGND, the positive electrode of the first battery is connected with the main power supply module through a first resistor, the pin 1 of the first integrated circuit is connected with the pin 2 of the first integrated circuit and grounded SGND, the pin 3 of the first integrated circuit is connected with an output port and grounded through the second capacitor, the pin 4 of the first integrated circuit is connected with the positive electrode of a first battery through the second resistor, the pin 5 of the first integrated circuit is connected with a main power supply module through the third resistor, the pin 6 of the first integrated circuit is connected with the pin 5 of the first integrated circuit through a tenth resistor and a third capacitor which are connected in series, and the pin 3 of the first integrated circuit is directly connected with a rear-stage circuit; the first integrated circuit is used for sampling the input or output current of the main power supply module in real time, amplifying and comparing the sampled current and transmitting the amplified and compared sampled current to the post-stage circuit.
6. The parallel power spreading circuit of claim 5, wherein the voltage-following current control module comprises: a fourth resistor, a fifth resistor, a sixth resistor, a twelfth resistor, a thirteenth resistor, a second integrated circuit, a first triode and a fourth capacitor, wherein the second integrated circuit is a controllable precise voltage-stabilizing source, the twelfth resistor and the thirteenth resistor are connected in parallel and are grounded, the connecting point of the first integrated circuit is connected with a pin 6 of the first integrated circuit in the current sampling module, the R pole of the second integrated circuit is connected with the sixth resistor and the twelfth resistor, the K pole of the second integrated circuit is connected with one end of the fourth resistor and the fourth capacitor, the A pole of the second integrated circuit is connected with the other end of the fourth capacitor and is grounded SGND, the E pole of the first triode is connected with the fifth resistor and the sixth resistor, the B pole of the first triode is connected with the fourth capacitor, the C pole of the first triode is connected with the rear-stage circuit, and the fourth resistor is connected with the fifth resistor and is connected with the rear-stage circuit and the main power supply output end; the first triode is used for controlling the post-stage circuit according to the sampling current.
7. The parallel power spreading circuit of claim 6, wherein the voltage-following current control module further comprises:
the integrated circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, an eleventh resistor, a first capacitor and a third integrated circuit, wherein the eighth resistor and the ninth resistor are connected in parallel and grounded SGND, the third integrated circuit is a controllable precise voltage-stabilizing source, the eighth resistor is connected with the fourth resistor in a preceding circuit, the R pole of the third integrated circuit is connected with the connection point of the eighth resistor and the ninth resistor and is connected with the K pole of the third integrated circuit through the seventh resistor and the first capacitor, the K pole of the third integrated circuit is connected with the auxiliary power supply module, and the A pole of the third integrated circuit is connected with the C pole of the first triode in the preceding circuit and is grounded SGND through the eleventh resistor; the third integrated circuit is used for controlling the output voltage and current of the auxiliary power supply module.
8. A parallel power spreading method using the circuit of claim 1, the method comprising the steps of:
monitoring the output voltage of the main power supply module in real time and sampling the input or output current of the main power supply module in real time;
regulating and controlling the output voltage of the auxiliary power supply to be synchronous according to the output voltage of the main power supply and the sampling current;
controlling the output current of the auxiliary power supply module to follow the change according to the change of the sampling current;
the output current of the auxiliary power supply module adjusts the current of the main power supply module to be lower than or equal to a preset threshold value through current negative feedback so as to ensure that the power is linearly expanded on the premise of ensuring the stability of the output voltage of the main power supply.
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