CN113543376B - Heating circuit board based on edge server - Google Patents
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- CN113543376B CN113543376B CN202110704510.7A CN202110704510A CN113543376B CN 113543376 B CN113543376 B CN 113543376B CN 202110704510 A CN202110704510 A CN 202110704510A CN 113543376 B CN113543376 B CN 113543376B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 129
- 230000007246 mechanism Effects 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000005485 electric heating Methods 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims description 10
- 230000007613 environmental effect Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000036760 body temperature Effects 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The invention relates to the technical field of servers and provides a heating circuit board based on an edge server, which comprises a power supply and control circuit, a heating mechanism, a microcontroller, an actual voltage acquisition processing circuit, a reference voltage conversion circuit, a voltage comparator U6 and a signal multiplexer U5, wherein the power supply and control circuit is used for controlling the power-on state of the heating mechanism according to the level of an enabling signal CON_1 generated by the signal multiplexer U5, the actual voltage acquisition processing circuit and the reference voltage conversion circuit are respectively used for acquiring an actual comparison voltage CON_2 and a reference voltage, the voltage comparator U6 and the signal multiplexer U5 are combined with the microcontroller to realize an adjustable scheme of heating power, so that the electric heating efficiency in a low-temperature environment is improved, the control logic and the code quantity are simplified, the burden of a control system is lightened, and the stability and the safety of the system are improved.
Description
Technical Field
The invention belongs to the technical field of servers, and particularly relates to a heating circuit board based on an edge server.
Background
Along with the rapid development of the related technology of edge computing, informatization gradually covers all the fields of society, and the landing of edge servers in industries such as petroleum, electric power and the like is promoted, so that the application scene of the servers is greatly expanded. The wide range of operators in China and the industries related to energy exploration bring new requirements to the stability and reliability of an edge server in a high-low temperature environment due to the wide working environment and use scene.
Aiming at the extremely low temperature deployment environment with the lowest environmental temperature reaching-40 ℃ and even lower server box body temperature, as part of electronic components do not have the characteristic of starting up to work at extremely low temperature, the edge server adopts a design scheme that heating plates are attached to the bottom of a plate, but the way of deploying the heating plates at the bottom of the plate has the defects in the aspects of reliability, using effect and the like, the problem of local overheating of the bottom surface of a circuit board can occur in use, and the heat loss is fast and the heating effect is not ideal due to the fact that the electronic components are close to a shell.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a heating circuit board based on an edge server, which aims to solve the problems that the prior art has defects in the aspects of reliability, use effect and the like in a mode of arranging heating plates at the bottom of the board, the bottom surface of the circuit board is locally overheated in use, and the heat loss is fast and the heating effect is not ideal due to the fact that the circuit board is close to a shell.
The technical scheme provided by the invention is as follows: the utility model provides a heating circuit board based on edge server, includes power and control circuit, heating mechanism, microcontroller, actual voltage acquisition processing circuit, reference voltage conversion circuit, voltage comparator U6 and signal multiplexer U5, wherein:
the power supply and control circuit is connected with the signal multiplexer U5 and is used for controlling the power-on state of the heating mechanism according to the level of the generated enabling signal CON_1 of the signal multiplexer U5;
the heating mechanism is connected with the power supply and the control circuit and is used for heating the chassis of the edge server according to the heating control instruction of the power supply and the control circuit;
the actual voltage acquisition processing circuit is respectively connected with the heating mechanism and the voltage comparator U6, and is used for acquiring working current of the heating mechanism, amplifying the acquired current to obtain actual comparison voltage CON_2, and conveying the actual comparison voltage CON_2 to the voltage comparator U6;
the microcontroller is connected with the temperature sensor and the signal multiplexer U5, and is used for acquiring the temperature parameter of the environment where the edge server is located through the temperature sensor, inquiring a reference comparison table of the environment temperature and the target voltage which are generated in advance according to the acquired temperature parameter of the environment where the edge server is located, acquiring a reference voltage, generating a MUC_SEL control signal according to the acquired reference voltage, and transmitting the MUC_SEL control signal to the signal multiplexer U5;
the reference voltage conversion circuit is respectively connected with the microcontroller and the voltage comparator U6, and is used for carrying out analog-to-digital conversion on the reference voltage acquired by the microcontroller and transmitting the reference voltage after analog-to-digital conversion to the voltage comparator U6;
the voltage comparator U6 is connected to the signal multiplexer U5, and is configured to compare the actual comparison voltage con_2 with a reference voltage, generate a corresponding high-level signal or low-level signal, and transmit the generated high-level signal or low-level signal to the signal multiplexer U5;
the signal multiplexer U5 is configured to generate an enable signal con_1 with adjustable heating power for controlling the heating mechanism to enter a working state according to the muc_sel control signal sent by the microcontroller and the high level signal or the low level signal sent by the voltage comparator U6.
As an improved scheme, the power supply and control circuit comprises an NMOS half-bridge driving chip U2 and a power MOS transistor Q2, wherein a gate of the power MOS transistor Q2 is connected with a pin HO of the NMOS half-bridge driving chip U2, a drain of the power MOS transistor Q2 is connected with a power supply BAT, and a source of the power MOS transistor Q2 is connected with the heating mechanism through a diode D6A;
the pin IN of the NMOS half-bridge driving chip U2 is connected with the enable signal CON_1;
a resistor R16 is arranged on a line between the gate of the power MOS transistor Q2 and the pin HO of the NMOS half-bridge driving chip U2, and the pin VCC of the NMOS half-bridge driving chip U2 is connected to the power supply terminal VCC.
As an improved scheme, the actual voltage acquisition processing circuit comprises a sampling resistor R11 and a current detection amplifier U4;
the current detection amplifier U4 amplifies the working current of the heating mechanism by the sampling resistor R11 to obtain an actual comparison voltage con_2.
As an improvement, the heating mechanism is a heating wire, and the heating wire is obtained by laying out a layout winding wire in a heating circuit board, and wiring is performed on a second layer of the heating circuit board.
As an improved scheme, the reference voltage conversion circuit comprises a digital-to-analog conversion chip U1, a pin OUTB of the digital-to-analog conversion chip U1 is connected with a homodromous input end of the voltage comparator U6, an inverted input end of the voltage comparator U6 is in signal connection with the actual comparison voltage con_2, and an output end of the voltage comparator U6 is connected with a pin M0 of the signal multiplexer U5;
pin A of the signal multiplexer U5 forms the enable signal CON_1, and pin S of the signal multiplexer U5 is connected to the MUC_SEL control signal of the microcontroller.
As an improved scheme, when the actual comparison voltage con_2 is smaller than the reference voltage aim_vol, the output end of the voltage comparator is at a high level; when the actual comparison voltage CON_2 is larger than the reference voltage AIM_VOL, the output end of the voltage comparator is at a low level;
when the MCU_SEL control signal is set low, the enable signal CON_1 is an output end signal of the voltage comparator; when the MCU_SEL control signal is set high, the enable signal CON_1 is set low, i.e., the power and control circuitry is off.
As an improved scheme, the heating process with adjustable heating power of the heating mechanism comprises a system start-up stage, a start-up preheating stage, a constant temperature control heating stage, a medium power heating stage, a low power heating stage and a closing heating stage.
As an improved scheme, in the system starting-up stage, a temperature sensor starts to detect the environmental temperature parameter of an edge server, the default ring temperature is a preset threshold value degree in a preset time period, and the detected environmental temperature does not reach the threshold value for activating a heating mechanism to execute heating action, so that an MCU_SEL control signal is set high by default, namely an enable signal CON_1 is set low, and a power supply and control circuit is disconnected;
in the start-up preheating stage, the microcontroller queries the reference table of the ambient temperature and the target voltage to obtain a target voltage value AIM_VOL equal to the first high power requirement value, and at this time, the MCU_SEL control signal is set low, i.e. the enable signal CON_1 is set high, and the power supply and control circuit is turned on and starts preheating.
As an improved scheme, in the constant temperature control heating stage, the microcontroller queries an environmental temperature and target voltage reference comparison table to obtain a target voltage value aim_vol equal to a high power demand value, at this time, the mcu_sel control signal is set low, and the enable signal con_1 is identical to the voltage at the output end of the voltage comparator;
because of the existence of the voltage comparator, when the actual comparison voltage CON_2 is slightly larger than the first high power requirement value, the output end of the voltage comparator is conveniently arranged low, and the power supply and the control circuit are correspondingly turned off; after the power supply and the control circuit are closed, loop current starts to fall back, and when the actual comparison voltage CON_2 falls back to be lower than a first high power requirement value, the output end of the voltage comparator is set high;
the circulation is carried out in this way, and the control realizes the constant power control of the heating wire.
As an improved scheme, in the middle power heating stage, the ambient temperature of the edge server rises, the control starts to reduce the heating power, the microcontroller obtains a target voltage value AIM_VOL to be equal to a middle power demand value according to a reference comparison table of the ambient temperature and the target voltage, and adjusts the reference voltage to the middle power demand value, and the middle power heat output is maintained according to the control logic of the constant temperature control heating stage;
in the low-power heating stage, the ambient temperature of the edge server rises, the heating power is controlled to be reduced, the microcontroller obtains a target voltage value AIM_VOL which is equal to a low-power requirement value according to a reference comparison table of the ambient temperature and the target voltage, and adjusts the reference voltage to a low-high-power requirement value, and the control logic of the heating stage is controlled according to the constant temperature to maintain the medium-power heat output;
when the loop temperature is higher than the preset threshold value degree in the heating-off stage, the MCU_SEL control signal is pulled up by default, namely the energy signal CON_1 is set low, and the power supply and the control circuit are disconnected.
In the embodiment of the invention, the heating circuit board based on the edge server comprises a power supply and control circuit, a heating mechanism, a microcontroller, an actual voltage acquisition and processing circuit, a reference voltage conversion circuit, a voltage comparator U6 and a signal multiplexer U5, wherein the power supply and control circuit is used for controlling the power-on state of the heating mechanism according to the level of an enabling signal CON_1 generated by the signal multiplexer U5, the actual voltage acquisition and processing circuit and the reference voltage conversion circuit are respectively used for acquiring an actual comparison voltage CON_2 and a reference voltage, the voltage comparator U6 and the signal multiplexer U5 are combined with the microcontroller to realize an adjustable scheme of heating power, the electric heating efficiency in a low-temperature environment is improved, the control logic and the code quantity are simplified, the burden of a control system is lightened, and the stability and the safety of the system are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
Fig. 1 is a schematic structural diagram of a heating circuit board based on an edge server provided by the invention;
FIG. 2 is a schematic diagram of the power supply and control circuit and the actual voltage acquisition and processing circuit provided by the invention;
FIG. 3 is a schematic diagram of a reference voltage converting circuit, a voltage amplifier and a signal multiplexer U5 according to the present invention;
fig. 4 is a circuit logic diagram of a heating circuit board based on an edge server provided by the invention.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for the purpose of more clearly illustrating the technical aspects of the present invention, and thus are merely exemplary and are not to be construed as limiting the scope of the present invention.
Fig. 1 is a schematic structural diagram of a heating circuit board based on an edge server according to the present invention, and for convenience of explanation, only a portion related to an embodiment of the present invention is shown in the drawing.
Heating circuit board based on edge server, its characterized in that includes power and control circuit, heating mechanism, microcontroller, actual voltage acquisition processing circuit, reference voltage conversion circuit, voltage comparator U6 and signal multiplexer U5, wherein:
the power supply and control circuit is connected with the signal multiplexer U5 and is used for controlling the power-on state of the heating mechanism according to the level of the generated enabling signal CON_1 of the signal multiplexer U5;
the heating mechanism is connected with the power supply and the control circuit and is used for heating the chassis of the edge server according to the heating control instruction of the power supply and the control circuit;
the actual voltage acquisition processing circuit is respectively connected with the heating mechanism and the voltage comparator U6, and is used for acquiring working current of the heating mechanism, amplifying the acquired current to obtain actual comparison voltage CON_2, and conveying the actual comparison voltage CON_2 to the voltage comparator U6;
the microcontroller is connected with the temperature sensor and the signal multiplexer U5, and is used for acquiring the temperature parameter of the environment where the edge server is located through the temperature sensor, inquiring a reference comparison table of the environment temperature and the target voltage which are generated in advance according to the acquired temperature parameter of the environment where the edge server is located, acquiring a reference voltage, generating a MUC_SEL control signal according to the acquired reference voltage, and transmitting the MUC_SEL control signal to the signal multiplexer U5;
the reference voltage conversion circuit is respectively connected with the microcontroller and the voltage comparator U6, and is used for carrying out analog-to-digital conversion on the reference voltage acquired by the microcontroller and transmitting the reference voltage after analog-to-digital conversion to the voltage comparator U6;
the voltage comparator U6 is connected to the signal multiplexer U5, and is configured to compare the actual comparison voltage con_2 with a reference voltage, generate a corresponding high-level signal or low-level signal, and transmit the generated high-level signal or low-level signal to the signal multiplexer U5;
the signal multiplexer U5 is configured to generate an enable signal con_1 with adjustable heating power for controlling the heating mechanism to enter a working state according to the muc_sel control signal sent by the microcontroller and the high level signal or the low level signal sent by the voltage comparator U6.
In this embodiment, the reference table of the ambient temperature and the target voltage is a pre-generated reference table, where the reference table is obtained by calibrating a low-temperature heating experiment, and the calculation mode of the target voltage is as follows: target voltage=heating wire target current×sampling resistor×voltage amplification factor, and no further description is given here.
In the embodiment of the invention, the heating mechanism is an electric heating wire, the electric heating wire is obtained by laying out a layout winding wire in the heating circuit board, and the second layer of the heating circuit board is routed, wherein the routing in the second layer is based on the influence of component signals and the heat conductivity coefficient of the plate.
Referring to fig. 2, the power supply and control circuit includes an NMOS half-bridge driving chip U2 and a power MOS transistor Q2, where a gate of the power MOS transistor Q2 is connected to a pin HO of the NMOS half-bridge driving chip U2, a drain of the power MOS transistor Q2 is connected to a power supply BAT, and a source of the power MOS transistor Q2 is connected to the heating mechanism through a diode D6A;
the pin IN of the NMOS half-bridge driving chip U2 is connected with the enable signal CON_1;
a resistor R16 is arranged on a circuit between the grid electrode of the power MOS tube Q2 and a pin HO of the NMOS half-bridge driving chip U2, and a pin VCC of the NMOS half-bridge driving chip U2 is connected with a power supply end VCC;
the power supply and control circuit further includes other elements, which are not described herein.
As shown in fig. 2, the actual voltage acquisition processing circuit includes a sampling resistor R11 and a current detection amplifier U4;
the current detection amplifier U4 amplifies the working current of the heating mechanism by the sampling resistor R11 to obtain an actual comparison voltage CON_2;
the sampling resistor R11 is a high-precision sampling resistor with a resistance value of 0.005 omega, the current detection amplifier U4 is a current detection amplifier, the voltage values at two ends of the sampling resistor R11 are detected and amplified, and the voltage amplification factor is determined by the resistance values of the reference resistors R3 and R4.
Referring to fig. 3, the reference voltage conversion circuit includes a digital-to-analog conversion chip U1, a pin OUTB of the digital-to-analog conversion chip U1 is connected to a same-directional input end of the voltage comparator U6, an opposite input end of the voltage comparator U6 is connected to the actual comparison voltage con_2, and an output end of the voltage comparator U6 is connected to a pin M0 of the signal multiplexer U5;
the pin A of the signal multiplexer U5 forms the enable signal CON_1, and the pin S of the signal multiplexer U5 is connected with the MUC_SEL control signal of the microcontroller;
the digital-to-analog conversion chip U1 is a 12-bit digital-to-analog converter, receives a target value from the MCU through the SPI bus and converts the target value into a corresponding voltage value;
in this embodiment, as shown in fig. 4, when the actual comparison voltage con_2 is smaller than the reference voltage aim_vol, the output terminal of the voltage comparator is at a high level; when the actual comparison voltage CON_2 is larger than the reference voltage AIM_VOL, the output end of the voltage comparator is at a low level;
when the MCU_SEL control signal is set low, the enable signal CON_1 is an output end signal of the voltage comparator; when the MCU_SEL control signal is set high, the enable signal CON_1 is set low, i.e., the power and control circuitry is off.
In the embodiment of the present invention, each device and element are all of a common model, and can be implemented through corresponding programming and control, which is not described herein.
Referring to fig. 1 to 4, the following describes a workflow of the edge server-based heating circuit board according to the present invention, which specifically includes a system start-up phase, a start-up preheating phase, a constant temperature control heating phase, a medium power heating phase, a low power heating phase, and a shutdown heating phase, wherein:
in the system starting-up stage (a-b), the temperature sensor starts to detect the environmental temperature parameter of the edge server, the default ring temperature is a preset threshold degree in a preset time period, and the MCU_SEL control signal is set high by default because the detected environmental temperature does not reach the threshold for activating the heating mechanism to execute the heating action, namely the energy signal CON_1 is set low, and the power supply and the control circuit are disconnected;
in the start-up preheating stage (b-c), the microcontroller queries an ambient temperature and target voltage reference comparison table to obtain a target voltage value AIM_VOL equal to a first high power requirement value, at this time, the MCU_SEL control signal is set low, namely the enable signal CON_1 is set high, and the power supply and control circuit are conducted and start preheating;
in the constant temperature control heating stage (c-d), the microcontroller queries an ambient temperature and target voltage reference comparison table to obtain a target voltage value AIM_VOL equal to a high power demand value, at the moment, the MCU_SEL control signal is set low, and the enable signal CON_1 is equal to the voltage of the output end of the voltage comparator; because of the existence of the voltage comparator, when the actual comparison voltage CON_2 is slightly larger than the first high power requirement value, the output end of the voltage comparator is conveniently arranged low, and the power supply and the control circuit are correspondingly turned off; after the power supply and the control circuit are closed, loop current starts to fall back, and when the actual comparison voltage CON_2 falls back to be lower than a first high power requirement value, the output end of the voltage comparator is set high; the circulation is carried out in this way, and the constant power control of the heating wire is realized;
in the middle power heating stage (d-e), the ambient temperature of the edge server rises, the control starts to reduce the heating power, the microcontroller obtains a target voltage value AIM_VOL equal to a middle power demand value according to a reference comparison table of the ambient temperature and the target voltage, and adjusts the reference voltage to the middle power demand value, and the middle power heat output is maintained according to the control logic of the constant temperature control heating stage;
in the low-power heating stage (e-f), the ambient temperature of the edge server rises, the control starts to reduce the heating power, the microcontroller obtains a target voltage value AIM_VOL equal to a low-power demand value according to a reference comparison table of the ambient temperature and the target voltage, and adjusts the reference voltage to a low-high-power demand value, and the control logic of the heating stage is controlled according to the constant temperature to maintain the medium-power heat output;
in the heating-off stage (f-g), when the ring temperature is higher than a preset threshold degree, the MCU_SEL control signal is pulled high by default, namely the enable signal CON_1 is set low, and the power supply and control circuit are disconnected.
In the embodiment of the invention, the heating circuit board based on the edge server comprises a power supply and control circuit, a heating mechanism, a microcontroller, an actual voltage acquisition and processing circuit, a reference voltage conversion circuit, a voltage comparator U6 and a signal multiplexer U5, wherein the power supply and control circuit is used for controlling the power-on state of the heating mechanism according to the level of an enabling signal CON_1 generated by the signal multiplexer U5, the actual voltage acquisition and processing circuit and the reference voltage conversion circuit are respectively used for acquiring an actual comparison voltage CON_2 and a reference voltage, the voltage comparator U6 and the signal multiplexer U5 are combined with the microcontroller to realize an adjustable scheme of heating power, the electric heating efficiency in a low-temperature environment is improved, the control logic and the code quantity are simplified, the burden of a control system is lightened, and the stability and the safety of the system are improved.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (8)
1. The utility model provides a heating circuit board based on edge server which characterized in that includes power and control circuit, heating mechanism, microcontroller, actual voltage acquisition processing circuit, reference voltage conversion circuit, voltage comparator U6 and signal multiplexer U5, wherein:
the power supply and control circuit is connected with the signal multiplexer U5 and is used for controlling the power-on state of the heating mechanism according to the level of the generated enabling signal CON_1 of the signal multiplexer U5;
the heating mechanism is connected with the power supply and the control circuit and is used for heating the chassis of the edge server according to the heating control instruction of the power supply and the control circuit;
the actual voltage acquisition processing circuit is respectively connected with the heating mechanism and the voltage comparator U6, and is used for acquiring working current of the heating mechanism, amplifying the acquired current to obtain actual comparison voltage CON_2, and conveying the actual comparison voltage CON_2 to the voltage comparator U6;
the microcontroller is connected with the temperature sensor and the signal multiplexer U5, and is used for acquiring the temperature parameter of the environment where the edge server is located through the temperature sensor, inquiring a reference comparison table of the environment temperature and the target voltage which are generated in advance according to the acquired temperature parameter of the environment where the edge server is located, acquiring a reference voltage, generating a MUC_SEL control signal according to the acquired reference voltage, and transmitting the MUC_SEL control signal to the signal multiplexer U5;
the reference voltage conversion circuit is respectively connected with the microcontroller and the voltage comparator U6, and is used for carrying out analog-to-digital conversion on the reference voltage acquired by the microcontroller and transmitting the reference voltage after analog-to-digital conversion to the voltage comparator U6;
the voltage comparator U6 is connected to the signal multiplexer U5, and is configured to compare the actual comparison voltage con_2 with a reference voltage, generate a corresponding high-level signal or low-level signal, and transmit the generated high-level signal or low-level signal to the signal multiplexer U5;
the signal multiplexer U5 is configured to generate an enable signal con_1 with adjustable heating power for controlling the heating mechanism to enter a working state according to the muc_sel control signal transmitted by the microcontroller and the high level signal or the low level signal transmitted by the voltage comparator U6;
the heating mechanism is an electric heating wire, and the electric heating wire is obtained by laying out layout windings in a heating circuit board and is wired on a second layer of the heating circuit board;
when the actual comparison voltage CON_2 is smaller than the reference voltage AIM_VOL, the output end of the voltage comparator is at a high level; when the actual comparison voltage CON_2 is larger than the reference voltage AIM_VOL, the output end of the voltage comparator is at a low level;
when the MCU_SEL control signal is set low, the enable signal CON_1 is an output end signal of the voltage comparator; when the MCU_SEL control signal is set high, the enable signal CON_1 is set low, i.e., the power and control circuitry is off.
2. The edge server-based heating circuit board according to claim 1, wherein the power supply and control circuit comprises an NMOS half-bridge driving chip U2 and a power MOS transistor Q2, a gate of the power MOS transistor Q2 is connected to a pin HO of the NMOS half-bridge driving chip U2, a drain of the power MOS transistor Q2 is connected to a power supply BAT, and a source of the power MOS transistor Q2 is connected to the heating mechanism through a diode D6A;
the pin IN of the NMOS half-bridge driving chip U2 is connected with the enable signal CON_1;
a resistor R16 is arranged on a line between the gate of the power MOS transistor Q2 and the pin HO of the NMOS half-bridge driving chip U2, and the pin VCC of the NMOS half-bridge driving chip U2 is connected to the power supply terminal VCC.
3. The edge server-based heating circuit board of claim 1, wherein the actual voltage acquisition processing circuit comprises a sampling resistor R11 and a current sense amplifier U4;
the current detection amplifier U4 amplifies the working current of the heating mechanism by the sampling resistor R11 to obtain an actual comparison voltage con_2.
4. The edge server-based heating circuit board according to claim 1, wherein the reference voltage conversion circuit comprises a digital-to-analog conversion chip U1, a pin OUTB of the digital-to-analog conversion chip U1 is connected to a co-directional input terminal of the voltage comparator U6, an inverting input terminal of the voltage comparator U6 is connected to the actual comparison voltage con_2 signal, and an output terminal of the voltage comparator U6 is connected to a pin M0 of the signal multiplexer U5;
pin A of the signal multiplexer U5 forms the enable signal CON_1, and pin S of the signal multiplexer U5 is connected to the MUC_SEL control signal of the microcontroller.
5. The edge server-based heating circuit board of claim 1, wherein the heating power-adjustable heating process of the heating mechanism comprises a system on phase, a power-on pre-heat phase, a thermostatically controlled heating phase, a medium power heating phase, a low power heating phase, and a shut-off heating phase.
6. The edge server-based heating circuit board of claim 5, wherein during the system start-up phase, the temperature sensor starts to detect the environmental temperature parameter of the edge server, the default ring temperature is a preset threshold degree in a preset time period, and the mcu_sel control signal is set high by default because the detected environmental temperature does not reach the threshold for activating the heating mechanism to perform the heating action, even if the enable signal con_1 is set low, the power supply and control circuit is disconnected;
in the start-up preheating stage, the microcontroller queries the reference table of the ambient temperature and the target voltage to obtain a target voltage value AIM_VOL equal to the first high power requirement value, and at this time, the MCU_SEL control signal is set low, i.e. the enable signal CON_1 is set high, and the power supply and control circuit is turned on and starts preheating.
7. The edge server-based heating circuit board of claim 6, wherein in the constant temperature control heating stage, the microcontroller queries an ambient temperature and target voltage reference table to obtain a target voltage value aim_vol equal to a high power demand value, at which time the mcu_sel control signal is set low and the enable signal con_1 is constant at the voltage of the output terminal of the voltage comparator;
because of the existence of the voltage comparator, when the actual comparison voltage CON_2 is slightly larger than the first high power requirement value, the output end of the voltage comparator is conveniently arranged low, and the power supply and the control circuit are correspondingly turned off; after the power supply and the control circuit are closed, loop current starts to fall back, and when the actual comparison voltage CON_2 falls back to be lower than a first high power requirement value, the output end of the voltage comparator is set high;
the circulation is carried out in this way, and the control realizes the constant power control of the heating wire.
8. The edge server-based heating circuit board of claim 6, wherein during the medium power heating phase, the ambient temperature of the edge server rises, the control starts to reduce the heating power, the microcontroller obtains a target voltage value aim_vol equal to the medium power demand value according to a reference table of the ambient temperature and the target voltage, and adjusts the reference voltage to the medium power demand value, and the medium power heat output is maintained according to the control logic of the constant temperature control heating phase;
in the low-power heating stage, the ambient temperature of the edge server rises, the heating power is controlled to be reduced, the microcontroller obtains a target voltage value AIM_VOL which is equal to a low-power requirement value according to a reference comparison table of the ambient temperature and the target voltage, and adjusts the reference voltage to a low-high-power requirement value, and the control logic of the heating stage is controlled according to the constant temperature to maintain the medium-power heat output;
when the loop temperature is higher than the preset threshold value degree in the heating-off stage, the MCU_SEL control signal is pulled up by default, namely the energy signal CON_1 is set low, and the power supply and the control circuit are disconnected.
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| CN210781389U (en) * | 2019-08-30 | 2020-06-16 | 苏州浪潮智能科技有限公司 | Server mainboard heating circuit |
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| CN207557710U (en) * | 2017-11-02 | 2018-06-29 | 北京华亘安邦科技有限公司 | The temperature-adjusting circuit of heating chip based on itself thermometric |
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