CN110190731B - Power supply circuit and system - Google Patents

Power supply circuit and system Download PDF

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Publication number
CN110190731B
CN110190731B CN201910572007.3A CN201910572007A CN110190731B CN 110190731 B CN110190731 B CN 110190731B CN 201910572007 A CN201910572007 A CN 201910572007A CN 110190731 B CN110190731 B CN 110190731B
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module
resistor
voltage reduction
sub
power supply
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CN110190731A (en
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王鑫
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Xian Yep Telecommunication Technology Co Ltd
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Xian Yep Telecommunication Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures

Abstract

The embodiment of the invention provides a power supply circuit and a system, wherein the power supply circuit comprises a first power supply, a controller, at least two voltage reduction modules and a first module, wherein the first power supply is connected with each voltage reduction module; the controller is connected with each voltage reduction module; the first module is respectively connected with at least two voltage reduction modules; the first module is used for obtaining the actual temperature of each voltage reduction module, the average temperature is determined according to the actual temperature of each voltage reduction module, the controller is used for obtaining the target temperature of each voltage reduction module, according to the target temperature of each voltage reduction module, the output current of the first voltage reduction module in at least two voltage reduction modules is reduced, the output current of the second voltage reduction module in at least two voltage reduction modules is increased, the target temperature of at least two voltage reduction modules is a first threshold value, the sum of the currents output by the at least two voltage reduction modules is unchanged, the target temperature of the first voltage reduction module is larger than the first threshold value, and the target temperature of the second voltage reduction module is smaller than the first threshold value. The normal work of the electronic equipment is guaranteed.

Description

Power supply circuit and system
Technical Field
The embodiment of the invention relates to the field of power supply circuits, in particular to a power supply circuit and a power supply system.
Background
Electronic devices (e.g., servers, industrial computers, etc.) are often provided with power supply circuitry for supplying current to the electronic devices to assist the electronic devices in operation.
At present, a power supply circuit includes a first power supply, a first power switch, a controller, at least one power stage (for stepping down the first power supply), and a load, where the first power switch is connected to the first power supply, the controller, and the power stage, the controller is connected to each power stage, and the load is connected to each power stage. In the working process of the power supply circuit, the controller can detect the temperature of each power level in real time, and when the temperature of one power level is greater than a threshold value, the first power switch is controlled to be switched off, so that the electronic equipment cannot work normally.
Disclosure of Invention
The embodiment of the invention provides a power supply circuit and a power supply system, which are used for enabling target temperatures of at least two voltage reduction modules to be a first threshold value, and preventing a controller from turning off a power switch when the target temperatures of the at least two voltage reduction modules are too high, so that normal work of electronic equipment is guaranteed.
In a first aspect, an embodiment of the present invention provides a power supply circuit, including: a first power supply, a controller, at least two voltage reduction modules, and a first module, wherein,
the first power supply is respectively connected with the at least two voltage reduction modules; the controller is respectively connected with the at least two voltage reduction modules; the first module is respectively connected with the at least two voltage reduction modules;
the first module is used for acquiring the actual temperature of each voltage reduction module and determining the average temperature according to the actual temperature of each voltage reduction module;
the controller is used for obtaining the target temperature of each voltage reduction module, reducing the output current of a first voltage reduction module in the at least two voltage reduction modules and increasing the output current of a second voltage reduction module in the at least two voltage reduction modules according to the target temperature of each voltage reduction module, so that the target temperatures of the at least two voltage reduction modules are first thresholds, the sum of the currents output by the at least two voltage reduction modules is unchanged, the target temperature of the first voltage reduction module is greater than the first threshold, and the target temperature of the second voltage reduction module is less than the first threshold.
In another possible embodiment, for any one of the at least two voltage-reducing modules, the voltage-reducing module includes a first sub-module, a second sub-module, and a third sub-module, wherein,
the first sub-module is respectively connected with the second sub-module, the third sub-module, the controller, the first module and the first power supply, the second sub-module is also respectively connected with the first module and the third sub-module, and the third sub-module is also connected with the controller;
the first submodule is used for reducing the voltage value of the electric signal output by the first power supply;
the second submodule is used for determining a temperature difference according to the average temperature and the actual temperature of the first submodule;
the third sub-module is used for determining the target temperature of the voltage reduction module according to the temperature difference and the current information of the first sub-module.
In another possible embodiment, the first module includes a first amplifier, a first resistor, a second resistor, a third resistor, and at least two fourth resistors, the number of the at least two fourth resistors is the same as the number of the at least two voltage-dropping modules, the resistances of the first resistor, the second resistor, and the fourth resistors are the same, the resistance of the third resistor is N times the resistance of the fourth resistor, and N is an integer greater than or equal to 2, where,
the non-inverting input end of the first amplifier is respectively connected with the first submodule of the voltage reduction module through one fourth resistor of the at least two fourth resistors and is grounded through the first resistor;
the inverting input end of the first amplifier is grounded through the second resistor and connected with the output end of the first amplifier through the third resistor, and the output end of the first amplifier is further connected with the second sub-module in each voltage reduction module.
In another possible embodiment, the second submodule in the buck module comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a second amplifier, wherein,
the non-inverting input end of the second amplifier is grounded through the fifth resistor and is connected with the first submodule through the sixth resistor;
and the inverting input end of the second amplifier is respectively connected with the first module through the seventh resistor and connected with the output end of the second amplifier through the eighth resistor.
In another possible embodiment, the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor have the same resistance.
In another possible embodiment, the third sub-module in the voltage-dropping module includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a third amplifier, wherein,
the non-inverting input end of the third amplifier is respectively connected with the first submodule through the ninth resistor, the second submodule through the tenth resistor and the ground through the eleventh resistor;
and the inverting input end of the third amplifier is grounded through the twelfth resistor and connected with the output end of the third amplifier through the thirteenth resistor, and the output end of the third amplifier is also connected with the controller.
In another possible embodiment, the number of the at least two voltage reduction modules is 4, and N is equal to 4.
In another possible embodiment, the power supply circuit further comprises a second power supply, wherein,
the second power supply is respectively connected with the first module, the first sub-module in each voltage reduction module, the second sub-module in each voltage reduction module and the third sub-module in each voltage reduction module;
the second power supply is used for enabling the first module, the first sub-module in each voltage reduction module, the second sub-module in each voltage reduction module and the third sub-module in each voltage reduction module to work.
In another possible embodiment, the output voltage of the first power supply is 12 volts and the output voltage of the second power supply is 5 volts, or 3.3 volts.
In a second aspect, an embodiment of the present invention provides a power supply system, where the power supply system includes any one of the power supply circuits in the first aspect.
The embodiment of the invention provides a circuit and a system, wherein the power supply circuit comprises a first power supply, a controller, at least two voltage reduction modules and a first module, wherein the first power supply is respectively connected with the at least two voltage reduction modules, the controller is respectively connected with the at least two voltage reduction modules, the first module is used for acquiring the actual temperature of each voltage reduction module and determining the average temperature according to the actual temperature of each voltage reduction module, the controller is used for acquiring the target temperature of each voltage reduction module and reducing the output current of the first voltage reduction module in the at least two voltage reduction modules and increasing the output current of the second voltage reduction module in the at least two voltage reduction modules according to the target temperature of each voltage reduction module, so that the target temperatures of the at least two voltage reduction modules are a first threshold value, and the sum of the currents output by the at least two voltage reduction modules is unchanged, the target temperature of the first voltage reduction module is greater than a first threshold, and the target temperature of the second voltage reduction module is less than the first threshold. In the process, the controller adjusts the current value of the current output by the voltage reduction module according to the target temperature of each voltage reduction module, so that the temperature of each voltage reduction module is the same and is a first threshold value, and the controller disconnects the power switch when the target temperature of each voltage reduction module is too high, thereby ensuring the normal work of the electronic equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an application scenario of a power supply circuit according to an embodiment of the present invention;
fig. 2 is a first schematic structural diagram of a power supply circuit according to an embodiment of the present invention;
fig. 3 is a second schematic structural diagram of a power supply circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second sub-module provided in the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a third sub-module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of an application scenario of a power supply circuit according to an embodiment of the present invention. Referring to fig. 1, a power supply circuit 11 and a load 12 are disposed in an electronic device 10, where the power supply circuit 11 includes a first power source 101, at least two voltage-reducing modules (e.g., a voltage-reducing module 102 and a voltage-reducing module 103), a controller 104, and a power switch 105, where the power supply circuit 11 is connected to the load 12, and the power supply circuit 11 is configured to provide current to the load 12.
In the working process of the power supply circuit 11, the controller 104 controls the power switch 105 to be turned on, each voltage reduction module inputs current to the load 12 according to the electrical signal output by the first power source 101, and the controller 104 detects the target temperature of each voltage reduction module in real time and adjusts the current input to the load 12 by each voltage reduction module according to the first threshold and the target temperature of each voltage reduction module. For example, if the target temperature of the voltage-reducing module 102 is greater than the first threshold and the target temperature of the voltage-reducing module 103 is less than the first threshold, the current input to the load 12 by the voltage-reducing module 102 is reduced, and the current input to the load 12 by the voltage-reducing module 103 is increased, so that the sum of the target temperatures of all the voltage-reducing modules, which is the first threshold, and the current input to the load 12 is unchanged.
In the process, the controller adjusts the current input to the load by the voltage reduction modules according to the first threshold and the target temperature of each voltage reduction module, so that the sum of the temperature of all the voltage reduction modules which is the first threshold and the current input to the load 12 is unchanged, and when the target temperature of the voltage reduction modules is too high, the controller controls the switch to be switched off, and the normal work of the electronic equipment is further ensured.
Hereinafter, the power supply circuit shown in the present application will be described in detail by way of specific embodiments. It should be noted that the following embodiments may be combined with each other, and the description of the same or similar contents in different embodiments is not repeated.
Fig. 2 is a first schematic structural diagram of a power supply circuit according to an embodiment of the present invention. Referring to fig. 2, the power supply circuit 11 includes a first power source 101, at least two voltage-reducing modules (e.g., a first voltage-reducing module 102, a second voltage-reducing module 103), a controller 104, and a first module 105, wherein,
the first power supply 101 is respectively connected with at least two voltage reduction modules; the controller 104 is respectively connected with at least two voltage reduction modules; the first module 105 is respectively connected with at least two voltage reduction modules;
the first module 105 is configured to obtain an actual temperature of each voltage reduction module, and determine an average temperature according to the actual temperature of each voltage reduction module;
the controller 104 is configured to obtain a target temperature of each buck module, and according to the target temperature of each buck module, reduce an output current of a first buck module of the at least two buck modules and increase an output current of a second buck module of the two buck modules, so that the temperatures of the at least two buck modules are a first threshold, a sum of the currents output by the at least two buck modules is unchanged, the target temperature of the first buck module is greater than the first threshold, and the target temperature of the second buck module is less than the first threshold.
In practical applications, a load is usually included in the electronic device provided with the power supply circuit, wherein the power supply circuit is connected with the load (as shown in fig. 1).
Optionally, the first power source 101 in the power supply circuit may respectively input the first electrical signal to at least two voltage-reducing modules, and the at least two voltage-reducing modules may process the received first electrical signal and input a current to the load, where the current is a sum of output currents of each voltage-reducing module.
The output voltage of the first power supply is 12 volts.
For example, when the power supply circuit 11 includes two voltage reduction modules, the current input to the load is the sum of the current output by the first voltage reduction module 102 and the current output by the second voltage reduction module 103.
Optionally, the current value of the output current of each voltage reduction module is adjustable.
Optionally, the controller 104 adjusts the current value of the current output by each buck module.
For example, the controller may be a Central Processing Unit (CPU).
Optionally, the controller may obtain a target temperature of each voltage reduction module, and adjust a current value of the output current of each voltage reduction module according to the target temperature of each voltage reduction module and the first threshold.
Alternatively, the first threshold may be 70 degrees celsius.
It should be noted that the target temperature of each voltage reduction module obtained by the controller is obtained according to the determined average temperature determined by the first module 105, specifically, refer to the embodiment in fig. 2. The first module 105 is detailed to determine the average temperature.
Optionally, the first module 105 includes N +1 ports, where N (e.g., ports 1 to N in fig. 2) ports are respectively and correspondingly connected to one voltage dropping module, and 1 (e.g., port N1 in fig. 2) is respectively connected to each voltage dropping module.
It should be noted that the average temperature determined by the first module 105 is input to each voltage reduction module through the port n1 in fig. 2.
Optionally, the first voltage-reducing module 102 is a voltage-reducing module of which the target temperature is greater than a first threshold value among the at least two voltage-reducing modules, and the second voltage-reducing module 102 is a voltage-reducing module of which the target temperature is less than the first threshold value among the at least two voltage-reducing modules.
For example, when the target temperature of the first voltage-reducing module 102 is 80 degrees celsius and the target temperature of the second voltage-reducing module 103 is 50 degrees celsius, the target temperature (80 degrees celsius) of the first voltage-reducing module 102 is greater than the first threshold (70 degrees celsius), and the target temperature (50 degrees celsius) of the second voltage-reducing module 103 is less than the first threshold, then the current value of the current output by the first voltage-reducing module 102 is reduced, and the current value of the current output by the second voltage-reducing module 103 is increased.
The embodiment of the invention provides a power supply circuit, which comprises a first power supply, a controller, at least two voltage reduction modules and a first module, wherein the first power supply is respectively connected with the at least two voltage reduction modules, the controller is respectively connected with the at least two voltage reduction modules, the first module is used for acquiring the actual temperature of each voltage reduction module and determining the average temperature according to the actual temperature of each voltage reduction module, the controller is used for acquiring the target temperature of each voltage reduction module, and according to the target temperature of each voltage reduction module, reducing the output current of the first voltage reduction module in the at least two voltage reduction modules and increasing the output current of the second voltage reduction module in the at least two voltage reduction modules, so that the target temperatures of the at least two voltage reduction modules are a first threshold value, and the sum of the currents output by the at least two voltage reduction modules is unchanged, the target temperature of the first voltage reduction module is greater than a first threshold, and the target temperature of the second voltage reduction module is less than the first threshold. In the process, the controller adjusts the current value of the current output by the voltage reduction module according to the target temperature of each voltage reduction module, so that the temperature of each voltage reduction module is the same and is a first threshold value, and the controller disconnects the power switch when the target temperature of each voltage reduction module is too high, thereby ensuring the normal work of the electronic equipment.
On the basis of any of the above embodiments, the following provides a further description of the power supply circuit provided in the present application with reference to fig. 3, specifically, refer to fig. 3. The embodiment of fig. 3 takes an example that the power supply circuit includes 2 voltage reduction modules, and the power supply circuit is explained.
Fig. 3 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention. Referring to fig. 3 on the basis of the embodiment of fig. 2, for any one of the at least two voltage-reducing modules, the voltage-reducing module in the power supply circuit includes a first sub-module 21, a second sub-module 22, and a third sub-module 23, wherein,
the first sub-module 21 is respectively connected with a second sub-module 22, a third sub-module 23, a controller 104, a first module 105 and a first power supply 101, the second sub-module 22 is also respectively connected with the first module 105 and the third module 23, and the third sub-module 23 is also connected with the controller 104;
the first sub-module 21 is configured to reduce a voltage value of an electrical signal output by the first power supply 101;
the second submodule 22 is configured to determine a temperature difference according to the average temperature and the actual temperature of the first submodule 21;
the third sub-module 23 is configured to determine a target temperature of the voltage reduction module according to the temperature difference and the current information of the first sub-module 21.
In another possible embodiment, the power supply circuit further includes a second power supply 106, wherein the second power supply 106 is respectively connected to the first module 105, the first submodule 21 in each buck module, the second submodule 22 in each buck module, and the third submodule 23 in each buck module;
the second power supply 106 is used to enable the first module 105, the first sub-module 21 in each buck module, the second sub-module 22 in each buck module, and the third sub-module 23 in each buck module.
Optionally, the second power supply 106 has an input port a, and the second power supply 106 is connected to the first submodule 21, the second submodule 22, the third submodule 23 and the first module 105 in each buck module through the input port a.
The output voltage of the second power supply may be 5 volts or 3.3 volts.
Optionally, the actual temperature of each buck module obtained by the first module 105 is the actual temperature of the first sub-module in each buck module.
Optionally, a temperature sensor is arranged in a first sub-module of each voltage reduction module, and the temperature sensor is used for acquiring the actual temperature of the first sub-module. The first module 105 may obtain the actual temperature of the first sub-module from a temperature sensor in the first sub-module.
Alternatively, the first module 105 may determine the average temperature according to equation 1 as follows:
Figure BDA0002111155160000081
wherein the content of the first and second substances,
Figure BDA0002111155160000082
for average temperature, M is the number of the voltage reduction modules (i.e. the number of the first sub-modules), and the value thereof may be 2, 3, 4, 5, etc., and T isMThe actual temperature of the Mth buck module (i.e., the temperature of the first sub-module)
Optionally, for one voltage reduction module, in the voltage reduction module, the second sub-module may obtain the average temperature from the first module 105, obtain the actual temperature of the first sub-module 21 from the temperature sensor of the first sub-module 21, and determine the temperature difference according to the obtained average temperature and the actual temperature of the first sub-module 21, where the temperature difference is the temperature difference of the first sub-module 21.
It should be noted that the second sub-module 22 can determine the temperature difference of the first sub-module by the following feasible formula 2:
Figure BDA0002111155160000083
wherein, Delta TM' is the temperature difference of the first submodule in the Mth buck module.
Optionally, a current sensor is arranged in the first sub-module, and the current sensor can acquire information of the output current of the first sub-module to obtain current information of the first sub-module.
Optionally, the third sub-module may obtain current information of the first sub-module from the current sensor, obtain a temperature difference from the second sub-module, and determine the target temperature of the voltage reduction module according to the obtained temperature difference and the current information of the first sub-module.
Alternatively, the third submodule 23 may determine the target temperature of the buck module by the following possible equation 3:
TM′＝K*ΔTM′+IMequation 3
Wherein, TM' is the target temperature of the Mth voltage reduction module, K is a proportional amplification factor, the value of K can be 0.2, 1, 2 and the like, IMAnd the current information of the first submodule in the Mth voltage reduction module.
In the present application, the target temperature, the actual temperature, the average temperature, the temperature difference, and the current information are all represented in the form of electrical signals, wherein the voltage value of the electrical signals is used to represent the magnitude of the temperature or the magnitude of the current.
For example, the voltage value of the current information of the first sub-module is 0.5 v, which may indicate that the current magnitude of the output current of the first sub-module is 2 amperes.
For example, the voltage value of the electrical signal at the actual temperature is 0.5 v, which may indicate that the temperature of the actual temperature is 1 degree celsius.
Alternatively, due to the temperature difference Δ TM', current information IMExpressed in the form of an electrical signal, the temperature difference Δ T can therefore be measuredMMultiplying K with the current information IMAddition, i.e. adding the voltage value of the electrical signal of the temperature difference by K timesMThe voltage value of (2).
In practical application, after the controller obtains the voltage value corresponding to the target temperature in each voltage reduction module, if the voltage value corresponding to the target temperature is greater than the voltage value corresponding to the first threshold, the controller may decrease the duty ratio of the first sub-module in the voltage reduction module (the voltage value corresponding to the target temperature of the voltage reduction module is greater than the voltage value corresponding to the first threshold) by using a Pulse Width Modulation (PWM) technique, so as to decrease the output current of the first sub-module, and if the voltage value corresponding to the target temperature is less than the voltage value corresponding to the first threshold, the controller may increase the duty ratio of the first sub-module in the voltage reduction module (the voltage value corresponding to the target temperature of the voltage reduction module is less than the voltage value corresponding to the first threshold) by using a PWM technique, so as to increase the output current of the first sub-module, so that the sum of the output currents of all the voltage reduction modules is unchanged, and the target temperature of all the voltage reduction modules is a first threshold value.
On the basis of any of the above embodiments, the embodiment of the present invention further provides a schematic structural diagram of a first module, please refer to fig. 4. In fig. 4, a schematic structure diagram of the first module is illustrated by taking an example that the first module includes 4 fourth resistors.
Fig. 4 is a schematic structural diagram of a first module according to an embodiment of the present invention. Referring to fig. 4 based on the embodiment of fig. 3, the first module 105 includes a first amplifier 51, a first resistor 52, a second resistor 53, a third resistor 54, and at least two fourth resistors (e.g., fourth resistors 55, 56, 57, and 58), the number of the at least two fourth resistors is the same as the number of the at least two voltage-dropping modules, the resistances of the first resistor 52, the second resistor 53, and the fourth resistors are the same, the resistance of the third resistor 54 is N times the resistance of the fourth resistor, N is an integer greater than or equal to 2, wherein,
the non-inverting input end of the first amplifier 51 is connected to the first submodule 21 of a voltage reduction module through one of at least two fourth resistors and is grounded through the first resistor 52;
the inverting input terminal of the first amplifier 51 is connected to the ground through the second resistor 53 and the output terminal of the first amplifier 51 through the third resistor 54, and the output terminal of the first amplifier 51 is further connected to the second sub-module 22 in each buck module.
Optionally, the number of the at least two fourth resistors is the same as the number of the at least two voltage reduction modules, for example, if the number M of the at least two voltage reduction modules is 4, the number of the fourth resistors is also 4.
Alternatively, the first resistor 52, the second resistor 53, the third resistor 54, and the fourth resistor (e.g., the fourth resistors 55, 56, 57, 58) may be fixed-resistance resistors or sliding varistors.
Optionally, the first resistor, the second resistor, and the fourth resistor have the same resistance, for example, the resistance may be 1 kilo ohm, 5 kilo ohm, or the like.
Optionally, the resistance of the third resistor is N times that of the fourth resistor, for example, if the resistance of the fourth resistor is 1 kilo ohm, the resistance of the third resistor is 4 kilo ohms.
Optionally, the non-inverting input terminal of the first amplifier 51 may be connected to the first submodule 21 of a buck module through a fourth resistor (which may be any one of the fourth resistors 55, 56, 57, and 58) at a port (which may be any one of the port in1, the port in2, the port in3, and the port in 4) corresponding to the fourth resistor.
Optionally, the first module 105 has an output port out, and the output port out of the first module 105 is connected to the second submodule 22 of each buck module. Optionally, please refer to fig. 5 for a detailed description of the second sub-module.
The input port a of the first amplifier 51 is connected to a second power supply. In practical applications, the first amplifier 51 further comprises an output port C, which is connected to ground.
On the basis of any one of the above embodiments, the embodiment of the present invention further provides a schematic structural diagram of a second sub-module, please refer to fig. 5.
Fig. 5 is a schematic structural diagram of a second sub-module according to an embodiment of the present invention. Referring to fig. 5 in addition to the embodiment of fig. 3, the second sub-module 22 includes a fifth resistor 61, a sixth resistor 62, a seventh resistor 63, an eighth resistor 64, and a second amplifier 65, wherein,
the non-inverting input end of the second amplifier 65 is grounded through a fifth resistor 61 and connected with the first submodule 21 through a sixth resistor 62;
the inverting input terminal of the second amplifier 65 is connected to the first module 105 through the seventh resistor 63, and is connected to the output terminal of the second amplifier 65 through the eighth resistor 64.
Optionally, the fifth resistor 61, the sixth resistor 62, the seventh resistor 63, and the eighth resistor 64 may be fixed resistors or sliding varistors.
Optionally, the fifth resistor 61, the sixth resistor 62, the seventh resistor 63, and the eighth resistor 64 have the same resistance, for example, the resistance may be 1 kilo ohm, 5 kilo ohm, or the like.
Optionally, the input port a of the second amplifier 65 is connected to the second power supply, and the second amplifier 65 further includes an output port C, and the output port C is connected to the ground point.
It should be noted that the non-inverting input of the second amplifier 65 is connected to the first submodule 21 at the input port D through the sixth resistor 62. The inverting input of the second amplifier 65 is connected to the first module 105 at input port E through a seventh resistor 63.
In practice, the second submodule 22 has an output port out, and the output port out of the second submodule 22 is connected to the third submodule 23.
On the basis of any one of the above embodiments, the embodiment of the present invention further provides a schematic structural diagram of a third sub-module, please refer to fig. 6.
Fig. 6 is a schematic structural diagram of a third sub-module according to an embodiment of the present invention. Referring to fig. 6 in addition to the embodiment of fig. 3, the third sub-module 23 includes a ninth resistor 71, a tenth resistor 72, an eleventh resistor 73, a twelfth resistor 74, a thirteenth resistor 75 and a third amplifier 76, wherein,
the non-inverting input end of the third amplifier 76 is respectively connected with the first sub-module 21 through a ninth resistor 71, connected with the second sub-module 22 through a tenth resistor 72 and grounded through an eleventh resistor 73;
the inverting input terminals of the third amplifier 76 are respectively connected to the ground through the twelfth resistors 74, the output terminals of the third amplifier 76 are connected through the thirteenth resistor 75, and the output terminals of the third amplifier 76 are further connected to the controller 104.
Alternatively, the ninth resistor 71, the tenth resistor 72, the twelfth resistor 74 and the thirteenth resistor 75 may be fixed resistors or sliding varistors.
Optionally, the ninth resistor 71, the tenth resistor 72, the twelfth resistor 74, and the thirteenth resistor 75 have the same resistance, for example, the resistance may be 1 kilo ohm, 5 kilo ohm, and the like.
Optionally, the input port a of the third amplifier 76 is connected to the second power supply, and the third amplifier 76 further includes an output port C, and the output port C is connected to the ground point.
Optionally, the non-inverting input of the third amplifier 76 is connected to the first sub-module 21 at the output port X through a ninth resistor 71, and is connected to the second sub-module 22 at the output port Y through a tenth resistor 72.
Optionally, the third submodule 23 has an output port out, and the output port out of the third submodule 23 is connected to the controller 104.
In a possible implementation manner, an embodiment of the present invention further provides a power supply system, where the power supply system includes the circuit in any one of the above embodiments.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims (9)

1. A power supply circuit, comprising: a first power supply, a controller, at least two voltage reduction modules, and a first module, wherein,
the first power supply is respectively connected with the at least two voltage reduction modules; the controller is respectively connected with the at least two voltage reduction modules; the first module is respectively connected with the at least two voltage reduction modules;
the first module is used for acquiring the actual temperature of each voltage reduction module and determining the average temperature according to the actual temperature of each voltage reduction module;
the controller is configured to obtain a target temperature of each buck module, and according to the target temperature of each buck module, reduce an output current of a first buck module of the at least two buck modules and increase an output current of a second buck module of the at least two buck modules, so that the target temperatures of the at least two buck modules are a first threshold, a sum of the currents output by the at least two buck modules is unchanged, the target temperature of the first buck module is greater than the first threshold, and the target temperature of the second buck module is less than the first threshold;
for any one of the at least two buck modules, the buck module includes a first sub-module, a second sub-module, and a third sub-module, wherein,
the first sub-module is respectively connected with the second sub-module, the third sub-module, the controller, the first module and the first power supply, the second sub-module is also respectively connected with the first module and the third sub-module, and the third sub-module is also connected with the controller;
the first submodule is used for reducing the voltage value of the electric signal output by the first power supply;
the second submodule is used for determining a temperature difference according to the average temperature and the actual temperature of the first submodule;
the third sub-module is used for determining the target temperature of the voltage reduction module according to the temperature difference and the current information of the first sub-module.
2. The circuit of claim 1, wherein the first module comprises a first amplifier, a first resistor, a second resistor, a third resistor, and at least two fourth resistors, the number of the at least two fourth resistors is the same as the number of the at least two voltage-dropping modules, the first resistor, the second resistor, and the fourth resistors have the same resistance, the third resistor has a resistance N times the fourth resistor, and N is an integer greater than or equal to 2, wherein,
the non-inverting input end of the first amplifier is respectively connected with the first submodule of the voltage reduction module through one fourth resistor of the at least two fourth resistors and is grounded through the first resistor;
the inverting input end of the first amplifier is grounded through the second resistor and connected with the output end of the first amplifier through the third resistor, and the output end of the first amplifier is further connected with the second sub-module in each voltage reduction module.
3. The circuit of claim 1, wherein a second submodule in the buck module includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a second amplifier, wherein,
the non-inverting input end of the second amplifier is grounded through the fifth resistor and is connected with the first submodule through the sixth resistor;
and the inverting input end of the second amplifier is respectively connected with the first module through the seventh resistor and connected with the output end of the second amplifier through the eighth resistor.
4. The circuit of claim 3, wherein the fifth resistor, the sixth resistor, the seventh resistor, and the eighth resistor have the same resistance.
5. The circuit of claim 1, wherein a third submodule in the buck module includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a third amplifier, wherein,
the non-inverting input end of the third amplifier is respectively connected with the first submodule through the ninth resistor, the second submodule through the tenth resistor and the ground through the eleventh resistor;
and the inverting input end of the third amplifier is grounded through the twelfth resistor and connected with the output end of the third amplifier through the thirteenth resistor, and the output end of the third amplifier is also connected with the controller.
6. The circuit of claim 2, wherein the number of the at least two voltage-reducing modules is 4, and wherein N is equal to 4.
7. The circuit of any of claims 1 to 6, wherein the power supply circuit further comprises a second power supply, wherein,
the second power supply is respectively connected with the first module, the first sub-module in each voltage reduction module, the second sub-module in each voltage reduction module and the third sub-module in each voltage reduction module;
the second power supply is used for enabling the first module, the first sub-module in each voltage reduction module, the second sub-module in each voltage reduction module and the third sub-module in each voltage reduction module to work.
8. The circuit of claim 7, wherein the output voltage of the first power supply is 12 volts and the output voltage of the second power supply is 5 volts or 3.3 volts.
9. A power supply system, characterized in that it comprises a circuit according to any one of the preceding claims 1 to 8.
CN201910572007.3A 2019-06-28 2019-06-28 Power supply circuit and system Active CN110190731B (en)

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