CN112859965B - Temperature control circuit and electronic equipment - Google Patents
Temperature control circuit and electronic equipment Download PDFInfo
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- CN112859965B CN112859965B CN202110063144.1A CN202110063144A CN112859965B CN 112859965 B CN112859965 B CN 112859965B CN 202110063144 A CN202110063144 A CN 202110063144A CN 112859965 B CN112859965 B CN 112859965B
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- switch tube
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
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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
Abstract
The embodiment of the invention relates to the technical field of electronics, in particular to a temperature control circuit and electronic equipment. The embodiment of the invention provides a temperature control circuit and electronic equipment, wherein the temperature control circuit comprises at least one temperature sampling circuit, an early warning circuit and a heat dissipation circuit; the temperature sampling circuit comprises a temperature detection circuit, a first reference signal circuit, a first comparison circuit, a second reference signal circuit and a second comparison circuit; the first comparison circuit is used for outputting a first control signal according to the temperature detection signal and a first reference signal so as to enable the early warning circuit to work based on the first control signal; the second comparison circuit is used for outputting a second control signal according to the temperature detection signal and a second reference signal so as to enable the heat dissipation circuit to work based on the second control signal. In the temperature control circuit, the early warning circuit and the radiating circuit work according to the first control signal and the second control signal respectively, energy efficiency authentication difficulty is low, and design is simple.
Description
Technical Field
The embodiment of the invention relates to the technical field of electronics, in particular to a temperature control circuit and electronic equipment.
Background
In circuit design, in some product designs with large heat generation, people often need to use a heat dissipation device to reduce the temperature of a device, and especially in power supply equipment or products, because the heat generation of a power supply is large, it is particularly important to perform necessary heat dissipation and alarm.
For heat dissipation of power supply equipment or products, a conventional means is to set a heat dissipation device to work, one working mode of the heat dissipation device is to continuously work after being started, and the other working mode is to control starting and stopping by a program. However, since the power supply has a requirement of standby power consumption, the heat dissipation circuit cannot operate all the time when the power supply is in standby, otherwise, the standby power consumption exceeds the standard, the first method increases the difficulty of energy efficiency authentication, and the second method has a complex design and has problems of program runaway, bolt locking, crash and the like.
Disclosure of Invention
In view of the foregoing defects in the prior art, embodiments of the present invention mainly solve the technical problem of providing a temperature control circuit and an electronic device, which are low in energy efficiency authentication difficulty and simple in design.
In order to solve the above technical problem, in a first aspect, an embodiment of the present invention adopts a technical solution that: providing a temperature control circuit, wherein the temperature control circuit comprises at least one temperature sampling circuit, an early warning circuit and a heat dissipation circuit; the temperature sampling circuit comprises a temperature detection circuit, a first reference signal circuit, a first comparison circuit, a second reference signal circuit and a second comparison circuit;
the output end of the temperature detection circuit is connected with the first end of the first comparison circuit and the first end of the second comparison circuit, and the temperature detection circuit is used for detecting the current temperature of equipment and outputting a corresponding temperature detection signal;
the output end of the first reference signal circuit is connected with the second end of the first comparison circuit, and the first reference signal circuit is used for outputting a first reference signal;
the output end of the first comparison circuit is connected with the early warning circuit, and the first comparison circuit is used for outputting a first control signal according to the temperature detection signal and the first reference signal so as to enable the early warning circuit to work based on the first control signal;
the output end of the second reference signal circuit is connected with the second end of the second comparison circuit, and the second reference signal circuit is used for outputting a second reference signal;
the output end of the second comparison circuit is connected with the heat dissipation circuit, and the second comparison circuit is used for outputting a second control signal according to the temperature detection signal and the second reference signal, so that the heat dissipation circuit works based on the second control signal.
In some embodiments, the temperature detection circuit includes a thermistor, a first resistor; the first end of the thermistor is connected with a reference voltage source, the second end of the thermistor is respectively connected with the first end of the first resistor, the first end of the first comparison circuit and the first end of the second comparison circuit, and the second end of the first resistor is connected with a first power supply.
In some embodiments, the thermistor is a negative temperature coefficient thermistor.
In some embodiments, the first reference signal circuit comprises a first voltage dividing resistor and a second voltage dividing resistor; a first end of the first voltage-dividing resistor is connected to the reference voltage source, a second end of the first voltage-dividing resistor is connected to a second end of the first comparing circuit and a first end of the second voltage-dividing resistor, respectively, and a second end of the second voltage-dividing resistor is connected to the first power source.
In some embodiments, the second reference signal circuit includes a third voltage dividing resistor and a fourth voltage dividing resistor; a first end of the third voltage dividing resistor is connected to the reference voltage source, a second end of the third voltage dividing resistor is connected to a second end of the second comparing circuit and a first end of the fourth voltage dividing resistor, respectively, and a second end of the fourth voltage dividing resistor is connected to the first power source.
In some embodiments, the first comparison circuit comprises a first comparator; the reverse phase input end of the first comparator is connected with the output end of the temperature detection circuit, the non-phase input end of the first comparator is connected with the output end of the first reference signal circuit, and the output end of the first comparator is connected with the early warning circuit.
In some embodiments, the first comparison circuit further comprises a second resistor and a first diode; one end of the second resistor is connected with the non-inverting input end of the first comparator, the other end of the second resistor is connected with the anode of the first diode, and the cathode of the first diode is connected with the output end of the first comparator.
In some embodiments, the second comparison circuit comprises a second comparator; the inverting input end of the second comparator is connected with the output end of the temperature detection circuit, the non-inverting input end of the second comparator is connected with the output end of the second voltage division circuit, and the output end of the second comparator is connected with the heat dissipation circuit.
In some embodiments, the second comparison circuit further comprises a third resistor and a second diode; one end of the third resistor is connected with the non-inverting input end of the second comparator, the other end of the third resistor is connected with the anode of the second diode, and the cathode of the second diode is connected with the output end of the second comparator.
In some embodiments, the early warning circuit comprises a first switching circuit and an early warning prompting unit;
the first end of the first switch circuit is connected with the output end of the first comparison circuit, the second end of the first switch circuit is connected with the early warning prompting unit, and the first switch circuit is used for controlling the early warning prompting unit to work according to the first control signal.
In some embodiments, the warning alert unit comprises an acoustic warning device, a light warning device, a vibration warning device, and/or a display screen warning device.
In some embodiments, the first switch circuit comprises a first switch tube, a second switch tube and a third switch tube, and the early warning prompting unit comprises a buzzer, a first light emitting diode and a second light emitting diode;
the output end of the first comparison circuit is respectively connected with the first end of the first switch tube and the first end of the second switch tube, the second end of the first switch tube is connected with a second power supply, the third end of the first switch tube is respectively connected with the buzzer and the anode of the first light-emitting diode, and the cathode of the first light-emitting diode is connected with the first power supply;
the second end of the second switch tube is connected with the first power supply, the third end of the second switch tube is connected with the first end of the third switch tube, the second end of the third switch tube is connected with the second power supply, the third end of the third switch tube is connected with the anode of the second light-emitting diode, and the cathode of the second light-emitting diode is connected with the first power supply.
In some embodiments, the heat dissipation circuit includes a second switching circuit and a heat dissipation unit;
the first end of the second switch circuit is connected with the output end of the second comparison circuit, the second end of the second switch circuit is connected with the heat dissipation unit, and the second switch circuit is used for controlling the heat dissipation unit to work according to the second control signal.
In some embodiments, the heat dissipation unit comprises a fan, a water cooling system, and/or a semiconductor refrigeration system.
In some embodiments, the second switching circuit comprises a fourth switching tube, a fifth switching tube and a sixth switching tube;
the first end of the fourth switching tube is connected with the output end of the second comparison circuit, the second end of the fourth switching tube is connected with the first power supply, the third end of the fourth switching tube is connected with the first end of the fifth switching tube, the first end of the fifth switching tube is further connected with the power supply, the second end of the fifth switching tube is connected with the first power supply, the third end of the fifth switching tube is connected with the first end of the sixth switching tube, the second end of the sixth switching tube is connected with the power supply, and the third end of the sixth switching tube is connected with the heat dissipation unit.
In some embodiments, the heat dissipating unit further comprises a fuse; the fuse is connected between the power supply and the second end of the sixth switching tube in series.
In some embodiments, the heat dissipating unit further comprises a voltage converting unit; the voltage conversion unit is connected between the third end of the sixth switching tube and the heat dissipation unit in series.
In some embodiments, the temperature control circuit comprises at least two temperature sampling circuits, the temperature control circuit further comprising a first logic control unit;
the input end of the first logic control unit is connected with the output ends of the at least two first comparison circuits, the output end of the first logic control unit is connected with the early warning circuit, and the first logic control unit is used for outputting first logic control signals according to the at least two first control signals to control the early warning circuit to work.
In some embodiments, the temperature control circuit comprises at least two temperature sampling circuits, the temperature control circuit further comprising a second logic control unit;
the input end of the second logic control unit is connected with the output ends of the at least two second comparison circuits, the output end of the second logic control unit is connected with the heat dissipation circuit, and the second logic control unit is used for outputting second logic control signals according to the at least two second control signals to control the heat dissipation circuit to work.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides an electronic device, which is characterized by including the temperature control circuit according to any one of the above first aspect.
The beneficial effects of the embodiment of the invention are as follows: different from the situation of the prior art, the embodiment of the invention provides a temperature control circuit and an electronic device, wherein the temperature control circuit comprises at least one temperature sampling circuit, an early warning circuit and a heat dissipation circuit; the temperature sampling circuit comprises a temperature detection circuit, a first reference signal circuit, a first comparison circuit, a second reference signal circuit and a second comparison circuit; the first comparison circuit is used for outputting a first control signal according to the temperature detection signal and a first reference signal so as to enable the early warning circuit to work based on the first control signal; the second comparison circuit is used for outputting a second control signal according to the temperature detection signal and a second reference signal, so that the heat dissipation circuit works based on the second control signal. In the temperature control circuit, the early warning circuit and the radiating circuit work according to the first control signal and the second control signal respectively, energy efficiency authentication difficulty is low, and design is simple.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic structural block diagram of a temperature control circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a partial circuit structure of a temperature sampling circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of another part of a temperature sampling circuit according to an embodiment of the present invention;
FIG. 4 is a block diagram of another temperature control circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of an early warning circuit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a heat dissipation circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural block diagram of another temperature control circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.
Referring to fig. 1, fig. 1 is a schematic structural block diagram of a temperature control circuit according to an embodiment of the present invention. As shown in fig. 1, the temperature control circuit 100 includes at least one temperature sampling circuit 10, an early warning circuit 20, and a heat dissipation circuit 30; the temperature sampling circuit 10 comprises a temperature detection circuit 11, a first reference signal circuit 12, a first comparison circuit 13, a second reference signal circuit 14 and a second comparison circuit 15; please refer to fig. 1, wherein an output terminal of the temperature detection circuit 11 is connected to a first terminal of the first comparison circuit 13 and a first terminal of the second comparison circuit 15, and the temperature detection circuit 11 is configured to detect a current temperature of the device and output a corresponding temperature detection signal; the output end of the first reference signal circuit 12 is connected to the second end of the first comparison circuit 13, and the first reference signal circuit 12 is configured to output a first reference signal; the output end of the first comparison circuit 13 is connected with the early warning circuit 20, and the first comparison circuit 13 is used for outputting a first control signal according to the temperature detection signal and a first reference signal so that the early warning circuit 20 works based on the first control signal; the output end of the second reference signal circuit 14 is connected to the second end of the second comparing circuit 15, and the second reference signal circuit 14 is used for outputting a second reference signal; the output end of the second comparing circuit 15 is connected to the heat dissipating circuit 30, and the second comparing circuit 15 is configured to output a second control signal according to the temperature detection signal and the second reference signal, so that the heat dissipating circuit 30 operates based on the second control signal.
In the temperature control circuit 100, a temperature detection circuit 11 in a temperature sampling circuit 10 detects the current temperature of an electronic device and outputs a corresponding temperature detection signal to a first comparison circuit 13 and a second comparison circuit 15, the first comparison circuit 13 compares the temperature detection signal with a first reference signal of a first reference signal circuit 12 and outputs a first control signal to enable an early warning circuit 20 to operate, the second comparison circuit 15 compares the temperature detection signal with a second reference signal of a second reference signal circuit 14 and outputs a second control signal to enable a heat dissipation circuit 30 to operate, and by arranging the first reference signal circuit 12 and the second reference signal circuit 14, the early warning circuit 20 and the heat dissipation circuit 30 need to operate under certain conditions.
In some embodiments, referring to fig. 2 and 3, the temperature detecting circuit 11 includes a thermistor RT1, a first resistor R1; the first end of the thermistor RT1 is connected with a reference voltage source, the second end of the thermistor RT1 is respectively connected with the first end of the first resistor R1, the first end of the first comparison circuit 13 and the first end of the second comparison circuit 15, and the second end of the first resistor R1 is connected with a first power supply. Specifically, the thermistor RT1 is a negative temperature coefficient thermistor. When the temperature rises, the resistance value of the nt 1 will decrease, and the voltage value of the NET1 output by the temperature detection circuit 11 will increase accordingly. In practical applications, the thermistor RT1 can also be a ptc thermistor, and it is not limited to the embodiment.
In some embodiments, with continued reference to fig. 2, the first reference signal circuit 12 includes a first voltage-dividing resistor Rp1 and a second voltage-dividing resistor Rp 2; a first terminal of the first voltage-dividing resistor Rp1 is connected to the reference voltage source, a second terminal of the first voltage-dividing resistor Rp1 is connected to a second terminal of the first comparison circuit 13 and a first terminal of the second voltage-dividing resistor Rp2, and a second terminal of the second voltage-dividing resistor Rp2 is connected to a first power supply. In practical applications, the number of voltage dividing resistors and the connection mode in the first reference signal circuit 12 can be set according to actual requirements, and the limitation in this embodiment is not required.
In some embodiments, referring to fig. 3, the second reference signal circuit 14 includes a third voltage dividing resistor Rp3 and a fourth voltage dividing resistor Rp 4; a first terminal of the third voltage-dividing resistor Rp3 is connected to the reference voltage source, a second terminal of the third voltage-dividing resistor Rp3 is connected to a second terminal of the second comparator circuit 15 and a first terminal of the fourth voltage-dividing resistor Rp4, and a second terminal of the fourth voltage-dividing resistor Rp4 is connected to the first power source. In practical applications, the number of voltage dividing resistors and the connection mode in the second reference signal circuit 14 can be set according to actual requirements, and the limitation in this embodiment is not required.
In some embodiments, the reference voltage source may use +2.5V, and the first power source is a GND ground, which is not described in detail in the following discussion. Meanwhile, referring to fig. 2, in order to accurately stabilize the voltage value of the reference voltage source, the reference voltage source may adopt a precision controllable voltage regulator chip U1, for example, a TL431 series chip, where a reference terminal of U1 is connected to a cathode and is connected to a +5V power supply through a resistor R9, at this time, U1 may output the reference voltage source and stabilize at +2.5V, and the +2.5V voltages of the reference voltage source may be connected through a universal serial bus or may be supplied with power by using multiple power supplies. In order to stabilize the +5V power supply and the +2.5V reference voltage source, please refer to fig. 2 again, two ends of the resistor R9 are further connected to one end of the capacitor C1 and one end of the capacitor C2, respectively, and the other ends of the capacitor C1 and the capacitor C2 are grounded. In practical application, the reference voltage source may adopt other voltage stabilizing devices, the reference voltage source may adopt other high power supply voltages, and the first power supply may adopt other low power supply voltages, which is not limited herein.
In some embodiments, with continued reference to fig. 2, the first comparison circuit 13 includes a first comparator U2; the inverting input terminal of the first comparator U2 is connected to the output terminal of the temperature detection circuit 11, the non-inverting input terminal of the first comparator U2 is connected to the output terminal of the first reference signal circuit 12, the output terminal of the first comparator U2 is connected to the warning circuit 20, and the first comparator U2 is configured to compare the temperature detection signal with the first reference signal, so as to output the first control signal EN1 to the warning circuit 20. In order to stabilize signals at the input end and the output end of the first comparator U2, the inverting input end of the first comparator U2 is further connected with a filter capacitor C3, the non-inverting input end of the first comparator U2 is further connected with a filter capacitor C4, and the output end of the first comparator U2 is further provided with a pull-up resistor R4.
In some embodiments, referring to fig. 3, the second comparing circuit 15 includes a second comparator U3; an inverting input terminal of the second comparator U3 is connected to the output terminal of the temperature detection circuit 11, a non-inverting input terminal of the second comparator U3 is connected to the output terminal of the second voltage division circuit 14, an output terminal of the second comparator U3 is connected to the heat dissipation circuit 30, and the second comparator U3 is configured to compare the temperature detection signal with the second reference signal, so as to output the second control signal EN2 to the heat dissipation circuit 30. In order to stabilize the signals at the input end and the output end of the second comparator U3, a filter capacitor C5 may be disposed at the inverting input end, a filter capacitor C7 may be disposed at the non-inverting input end, and a pull-up resistor R12 may be disposed at the output end of the second comparator U3.
In order to avoid the jitter of the temperature control circuit 100 at the temperature switching point, in some embodiments, referring to fig. 2, the first comparison circuit 13 further includes a second resistor R2 and a first diode D1; one end of the second resistor R2 is connected to the non-inverting input terminal of the first comparator U2, the other end of the second resistor R2 is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the output terminal of the first comparator U2. In this way, the second resistor R2 and the first diode D1 form a hysteresis circuit in the first comparator circuit 13, and when the first comparator U2 switches from a low level to a high level, the voltage value of the first reference signal output from the first reference signal circuit 12 is lowered, the switching value of the first comparator U2 is changed, and jitter of the temperature control circuit 100 at the switching point is prevented.
Similarly, in some embodiments, a hysteresis circuit may also be disposed in the second comparing circuit 15, for example, referring to fig. 3, the second comparing circuit 15 further includes a third resistor R3 and a second diode D2; one end of the third resistor R3 is connected to the non-inverting input terminal of the second comparator U3, the other end of the third resistor R3 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the output terminal of the second comparator U3. Thus, the hysteresis circuit formed by the third resistor R3 and the second diode D2 can reduce the voltage value of the second reference signal when the second comparator U3 switches from low level to high level, thereby changing the switching value of the second comparator U3 and preventing the temperature control circuit 100 from jittering at the switching point.
In some embodiments, referring to fig. 4, the warning circuit 20 includes a first switch circuit 21 and a warning prompting unit 22; a first end of the first switch circuit 21 is connected to the output end of the first comparison circuit 13, a second end of the first switch circuit 21 is connected to the early warning prompting unit 22, and the first switch circuit 21 is configured to control the early warning prompting unit 22 to operate according to the first control signal. Specifically, the warning prompt unit 22 includes an acoustic warning device, an optical warning device, a vibration warning device, and/or a display screen warning device. For example, the sound alarm may be a buzzer, the light alarm may be a light emitting diode, the vibration alarm may be a vibration motor, the display screen alarm may be an LED display screen, an LCD display screen or an OLED display screen, and in practical applications, the warning indication unit 22 may also be any other suitable warning indication device, which is not limited herein.
In some embodiments, referring to fig. 5, the first switch circuit includes a first switch tube Q1, a second switch tube Q2 and a third switch tube Q3, and the warning prompt unit 22 includes a buzzer BZ1, a first light emitting diode D1 and a second light emitting diode D2; specifically, the first switch tube Q1 and the second switch tube Q2 adopt P-channel depletion type field effect transistors, the third switch tube Q3 adopts N-channel enhancement type field effect transistors, wherein the output end of the first comparison circuit 13 is respectively connected with the gate of the first switch tube Q1 and the gate of the second switch tube Q2, the source of the first switch tube Q1 is connected with the second power supply, the drain of the first switch tube Q1 is respectively connected with the anodes of the buzzer BZ1 and the first light emitting diode D1, and the cathode of the first light emitting diode D1 is connected with the first power supply; the source of the second switch tube Q2 is connected to the first power supply, the drain of the second switch tube Q2 is connected to the gate of the third switch tube Q3, the source of the third switch tube Q3 is connected to the second power supply, the drain of the third switch tube Q3 is connected to the anode of the second light emitting diode D2, and the cathode of the second light emitting diode D2 is connected to the first power supply.
Specifically, the first power supply may be a ground terminal, the second power supply may be a +5V power supply, and the +5V power supply may be connected to each other by a universal serial bus or may be supplied with power by multiple power supplies. In practical application, the first switch tube Q1, the second switch tube Q2 and the third switch tube Q3 may also be triodes, the number and type thereof may be set according to actual needs, the first light emitting diode D1 and the second light emitting diode D2 may be integrated light emitting diodes or split light emitting diodes, the color of the light emitting diodes may be set according to actual needs, the warning prompting unit may select one or more warning devices, or any other suitable warning devices, or corresponding warning circuits may also be set according to needs, or any limitation in this embodiment is not required.
In some embodiments, referring to fig. 4, the heat dissipation circuit 30 includes a second switch circuit 31 and a heat dissipation unit 32; a first end of the second switch circuit 31 is connected to the output end of the second comparator circuit 15, a second end of the second switch circuit 31 is connected to the heat dissipation unit 32, and the second switch circuit 31 is configured to control the heat dissipation unit 32 to operate according to a second control signal. Specifically, the heat dissipation unit 32 includes a fan, a water cooling system, and/or a semiconductor refrigeration system.
In some embodiments, referring to fig. 6, the second switch circuit includes a fourth switch Q4, a fifth switch Q5, and a sixth switch Q6, and the heat dissipation unit is a low voltage dc FAN; specifically, the fourth switching tube Q4 and the fifth switching tube Q5 are both N-channel enhancement mode fets, and the sixth switching tube Q6 is a P-channel depletion mode fet, wherein the gate of the fourth switching tube Q4 is connected to the output terminal of the second comparing circuit 15, the source of the fourth switching tube Q4 is connected to the first POWER supply, the drain of the fourth switching tube Q4 is connected to the gate of the fifth switching tube Q5, the gate of the fifth switching tube Q5 is further connected to a POWER supply POWER, the source of the fifth switching tube Q5 is connected to the first POWER supply, the drain of the fifth switching tube Q5 is connected to the gate of the sixth switching tube Q6, the source of the sixth switching tube Q6 is connected to the POWER supply POWER, and the drain of the sixth switching tube Q6 is connected to the FAN. In practical applications, the fourth switching tube Q4, the fifth switching tube Q5, and the sixth switching tube Q6 may be triodes, and meanwhile, the types may be set according to actual needs, and the heat dissipation unit may also be any other suitable heat dissipation device, which is not limited in this embodiment.
Generally, the POWER supply POWER in the heat dissipation circuit 30 is a high POWER supply voltage, and in order to ensure the safety of the device, in some embodiments, please refer to fig. 6 again, the heat dissipation unit 32 further includes a voltage division unit formed by a fuse F1, a zener diode ZD1, a resistor R10, and a resistor R14; the fuse F1 is connected in series between the POWER supply POWER and the source of the sixth switching tube Q6, the grid of the fifth switching tube Q5 is connected with the POWER supply POWER through a voltage division unit, and the voltage stabilizing diode ZD1 is connected between the source and the grid of the sixth switching tube Q6. In practical use, the POWER can be supplied by using multiple POWER supplies, and the POWER is not limited to the specific circuit structure provided in this embodiment.
In order to increase the range of the temperature control circuit 100, in some embodiments, please continue to refer to fig. 6, the heat dissipation unit 32 further includes a voltage conversion unit U4; the voltage conversion unit U4 is connected in series between the drain of the sixth switching tube Q6 and the FAN. In practical applications, the voltage conversion unit U4 may be a voltage boosting circuit, a voltage dropping circuit, or a voltage boosting and dropping circuit, so that whether the voltage conversion unit is boosting or dropping can be selected according to the relationship between the power supply and the power supply voltage required by the heat dissipation unit, so that the power supply provided by the user can meet the working condition of the heat dissipation unit.
The following describes the specific operation of the temperature control circuit provided in the present invention in detail with reference to the embodiments shown in fig. 2, 3, 5 and 6. Specifically, the thermistor RT1 is a negative temperature coefficient thermistor with a normal temperature resistance value of 100K, B and 3435, namely the resistance value of the thermistor RT1 is 100K at 25 ℃; the first resistor R1, the second voltage-dividing resistor Rp2 and the fourth voltage-dividing resistor Rp4 have the same resistance, for example, 100K resistors can be selected; the resistance of the first voltage-dividing resistor Rp1 is smaller than that of the third voltage-dividing resistor Rp3, for example, the resistance of the first voltage-dividing resistor Rp1 is 50K, and the resistance of the third voltage-dividing resistor Rp3 is 62K; the first light emitting diode D1 is a red light emitting diode, and the second light emitting diode D2 is a green light emitting diode. In practical applications, the resistance values of the resistors can be set according to actual needs, and the limitation in this embodiment is not required.
At this time, at normal temperature, the voltage value of the temperature detection signal NET1 is smaller than the voltage value of the first reference signal and smaller than the voltage value of the second reference signal, at this time, the first comparator U2 outputs a high level, the first switch tube Q1 is not conducted, the buzzer BZ1 and the first light emitting diode D1 do not work, the second switch tube Q2 is conducted, so that the third switch tube Q3 is conducted, the second light emitting diode D2 works to emit green light, at the same time, the second comparator U3 outputs a high level, the fourth switch tube Q4 is conducted, the fifth switch tube Q5 is not conducted, finally the sixth switch tube Q6 is not conducted, and the FAN does not work; when the temperature slowly rises to reach the first switching temperature, the resistance value of the thermistor RT1 is smaller than the resistance value of the third voltage-dividing resistor Rp3 and larger than the resistance value of the first voltage-dividing resistor Rp1, at this time, the voltage value of the temperature detection signal NET1 is larger than the voltage value of the second reference signal, the second comparator U3 outputs a low level, the fourth switch tube Q4 is not conducted, the fifth switch tube Q5 is conducted, finally the sixth switch tube Q6 is conducted, and the FAN operates to cool the electronic device by heat dissipation; then, when the temperature continues to rise and reach the second switching temperature, the resistance value of the thermistor RT1 is smaller than the resistance value of the first voltage-dividing resistor Rp1, at this time, the voltage value of the temperature detection signal NET1 is larger than the voltage value of the first reference signal, the first comparator U3 outputs a low level, the second switch tube Q2 and the third switch tube Q3 are not conducted, the second light-emitting diode D2 does not work, the first switch tube Q1 is conducted, the buzzer BZ1 and the second light-emitting diode D2 work, and the red light is emitted and an alarm sound is emitted to achieve the purpose of alarm prompt.
When the temperature is gradually reduced from high to low, the voltage value of the first reference signal and the voltage value of the second reference signal are reduced due to the arrangement of the first hysteresis circuit and the second hysteresis circuit, namely, the switching threshold values of the first comparator and the second comparator are changed, namely, the third switching temperature of the first comparator is lower than the second switching temperature when the first comparator is switched from low level to high level; it can be understood that, since the first voltage-dividing resistor Rp1 is smaller than the third voltage-dividing resistor Rp3, the third switching temperature is higher than the fourth switching temperature, when the temperature is gradually decreased from high to low to the third switching temperature, the temperature control circuit turns off the buzzer BZ1 and the red diode, turns on the green diode, and then the temperature continues to decrease to the fourth switching temperature, and finally turns off the FAN.
In summary, the temperature control circuit 100 provided by the invention has a simple structure, is easy to design, is safe and reliable, the fan can be turned on to dissipate heat when the temperature rises, the alarm lamp can give an alarm and the buzzer can give an alarm when the temperature continues to rise, and the alarm and heat dissipation circuit can be turned off after the temperature drops. Therefore, the temperature control circuit meets the requirements of heat dissipation and energy efficiency certification of the electronic equipment. Meanwhile, the circuit is built by adopting conventional components, so that the production cost is low, and mass production can be carried out.
In some embodiments, referring to fig. 7, the temperature control circuit 100 includes at least two temperature sampling circuits 10, and the temperature control circuit 100 further includes a first logic control unit 40; the input end of the first logic control unit 40 is connected to the output ends of the at least two first comparison circuits 13, the output end of the first logic control unit 40 is connected to the early warning circuit 20, and the first logic control unit 40 is configured to output a first logic control signal according to the at least two first control signals to control the early warning circuit 20 to operate. Specifically, the first logic control unit 40 may be an and gate, so that only when the first comparison circuits of the temperature sampling circuit output consistent high level signals, the first logic control unit outputs high level signals, and the warning circuit can stop warning, and at other times, the first logic control unit outputs low level signals, and the warning circuit is in a warning operating state, so that the temperature control circuit 100 is safer and more reliable. In practical applications, the first logic control unit may be any other suitable logic gate, and need not be limited to the embodiment.
In some embodiments, please continue to refer to fig. 7, the temperature control circuit 100 includes at least two temperature sampling circuits 10, and the temperature control circuit 100 further includes a second logic control unit 50; the input end of the second logic control unit 50 is connected to the output ends of the at least two second comparison circuits 15, the output end of the second logic control unit 50 is connected to the heat dissipation circuit 30, and the second logic control unit 50 is configured to output a second logic control signal according to the at least two second control signals to control the heat dissipation circuit 30 to operate. Specifically, the second logic control unit 50 may be an and gate, so that only when the second comparison circuits of the temperature sampling circuit output consistent high level signals, the second logic control unit outputs high level signals to stop the heat dissipation circuit from dissipating heat, and otherwise, the second logic control unit outputs low level signals, and the heat dissipation circuit is in a heat dissipation working state, so that the temperature control circuit 100 is safer and more reliable. In practical applications, the second logic control unit may be any other suitable logic gate, and the limitation in this embodiment is not required herein.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides an electronic device, which is characterized by including the temperature control circuit as described in any one of the above. The electronic equipment is generally power supply equipment or other equipment needing heat dissipation, the electronic equipment provided by the invention is provided with at least one temperature sampling circuit, an early warning circuit and a heat dissipation circuit, wherein the temperature detection circuit in the temperature sampling circuit detects the current temperature of the electronic equipment and outputs corresponding temperature detection signals to a first comparison circuit and a second comparison circuit, the first comparison circuit compares the temperature detection signals with a first reference signal of a first reference signal circuit and outputs a first control signal so as to enable the early warning circuit to work, the second comparison circuit compares the temperature detection signals with a second reference signal of a second reference signal circuit and outputs a second control signal so as to enable the heat dissipation circuit to work, and the early warning circuit and the heat dissipation circuit start to work under certain conditions by arranging the first reference signal circuit and the second reference signal circuit, therefore, the design structure is simple, the heat dissipation problem of the electronic equipment is solved, and the difficulty of energy efficiency authentication is reduced.
The embodiment of the invention provides a temperature control circuit and electronic equipment, wherein the temperature control circuit comprises at least one temperature sampling circuit, an early warning circuit and a heat dissipation circuit; the temperature sampling circuit comprises a temperature detection circuit, a first reference signal circuit, a first comparison circuit, a second reference signal circuit and a second comparison circuit; the first comparison circuit is used for outputting a first control signal according to the temperature detection signal and a first reference signal so as to enable the early warning circuit to work based on the first control signal; the second comparison circuit is used for outputting a second control signal according to the temperature detection signal and a second reference signal, so that the heat dissipation circuit works based on the second control signal. In the temperature control circuit, the early warning circuit and the radiating circuit work according to the first control signal and the second control signal respectively, energy efficiency authentication difficulty is low, and design is simple.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (15)
1. A temperature control circuit is characterized by comprising at least two temperature sampling circuits, an early warning circuit and a heat dissipation circuit; the temperature sampling circuit comprises a temperature detection circuit, a first reference signal circuit, a first comparison circuit, a second reference signal circuit, a second comparison circuit and a first logic control unit;
the output end of the temperature detection circuit is connected with the first end of the first comparison circuit and the first end of the second comparison circuit, and the temperature detection circuit is used for detecting the current temperature of equipment and outputting a corresponding temperature detection signal;
the output end of the first reference signal circuit is connected with the second end of the first comparison circuit, and the first reference signal circuit is used for outputting a first reference signal;
the output end of the first comparison circuit is connected with the early warning circuit, and the first comparison circuit is used for outputting a first control signal according to the temperature detection signal and the first reference signal so as to enable the early warning circuit to work based on the first control signal;
the output end of the second reference signal circuit is connected with the second end of the second comparison circuit, and the second reference signal circuit is used for outputting a second reference signal;
the output end of the second comparison circuit is connected with the heat dissipation circuit, and the second comparison circuit is used for outputting a second control signal according to the temperature detection signal and the second reference signal so as to enable the heat dissipation circuit to work based on the second control signal;
the input end of the first logic control unit is connected with the output ends of at least two first comparison circuits, the output end of the first logic control unit is connected with the early warning circuit, and the first logic control unit is used for outputting first logic control signals according to at least two first control signals to control the early warning circuit to work;
the first comparison circuit comprises a first comparator, a second resistor and a first diode, and the second comparison circuit comprises a second comparator, a third resistor and a second diode;
the negative phase input end of the first comparator is connected with the output end of the temperature detection circuit, the non-inverting input end of the first comparator is connected with the output end of the first reference signal circuit, the output end of the first comparator is connected with the early warning circuit, one end of the second resistor is connected with the non-inverting input end of the first comparator, the other end of the second resistor is connected with the anode of the first diode, and the cathode of the first diode is connected with the output end of the first comparator;
the inverting input end of the second comparator is connected with the output end of the temperature detection circuit, the non-inverting input end of the second comparator is connected with the output end of the second reference signal circuit, the output end of the second comparator is connected with the heat dissipation circuit, one end of the third resistor is connected with the non-inverting input end of the second comparator, the other end of the third resistor is connected with the anode of the second diode, and the cathode of the second diode is connected with the output end of the second comparator.
2. The temperature control circuit of claim 1, wherein the temperature sensing circuit comprises a thermistor, a first resistor; the first end of the thermistor is connected with a reference voltage source, the second end of the thermistor is respectively connected with the first end of the first resistor, the first end of the first comparison circuit and the first end of the second comparison circuit, and the second end of the first resistor is connected with a first power supply.
3. The temperature control circuit of claim 2, wherein the thermistor is a negative temperature coefficient thermistor.
4. The temperature control circuit of claim 1, wherein the first reference signal circuit comprises a first voltage dividing resistor and a second voltage dividing resistor; a first end of the first voltage-dividing resistor is connected to a reference voltage source, a second end of the first voltage-dividing resistor is connected to a second end of the first comparing circuit and a first end of the second voltage-dividing resistor, respectively, and a second end of the second voltage-dividing resistor is connected to a first power supply.
5. The temperature control circuit of claim 1, wherein the second reference signal circuit comprises a third voltage dividing resistor and a fourth voltage dividing resistor; a first end of the third voltage dividing resistor is connected to a reference voltage source, a second end of the third voltage dividing resistor is connected to a second end of the second comparing circuit and a first end of the fourth voltage dividing resistor, respectively, and a second end of the fourth voltage dividing resistor is connected to a first power supply.
6. The temperature control circuit according to any one of claims 1-5, wherein the early warning circuit comprises a first switching circuit and an early warning prompting unit;
the first end of the first switch circuit is connected with the output end of the first comparison circuit, the second end of the first switch circuit is connected with the early warning prompting unit, and the first switch circuit is used for controlling the early warning prompting unit to work according to the first control signal.
7. The temperature control circuit of claim 6, wherein the warning alert unit comprises an acoustic warning, an optical warning, a vibratory warning, and/or a display screen warning.
8. The temperature control circuit of claim 7, wherein the first switch circuit comprises a first switch tube, a second switch tube and a third switch tube, and the early warning prompting unit comprises a buzzer, a first light emitting diode and a second light emitting diode;
the output end of the first comparison circuit is respectively connected with the first end of the first switch tube and the first end of the second switch tube, the second end of the first switch tube is connected with a second power supply, the third end of the first switch tube is respectively connected with the buzzer and the anode of the first light-emitting diode, and the cathode of the first light-emitting diode is connected with the first power supply;
the second end of the second switch tube is connected with a first power supply, the third end of the second switch tube is connected with the first end of the third switch tube, the second end of the third switch tube is connected with the second power supply, the third end of the third switch tube is connected with the anode of the second light-emitting diode, and the cathode of the second light-emitting diode is connected with the first power supply.
9. The temperature control circuit according to any one of claims 1 to 5, wherein the heat dissipation circuit includes a second switching circuit and a heat dissipation unit;
the first end of the second switch circuit is connected with the output end of the second comparison circuit, the second end of the second switch circuit is connected with the heat dissipation unit, and the second switch circuit is used for controlling the heat dissipation unit to work according to the second control signal.
10. The temperature control circuit of claim 9, wherein the heat dissipation unit comprises a fan, a water cooling system, and/or a semiconductor refrigeration system.
11. The temperature control circuit of claim 9, wherein the second switching circuit comprises a fourth switching tube, a fifth switching tube and a sixth switching tube;
the first end of fourth switch tube is connected the output of second comparison circuit, the first power is connected to the second end of fourth switch tube, the third end of fourth switch tube is connected the first end of fifth switch tube, power supply is still connected to the first end of fifth switch tube, first power is connected to the second end of fifth switch tube, the third end of fifth switch tube is connected the first end of sixth switch tube, the second end of sixth switch tube is connected power supply, the third end of sixth switch tube is connected the radiating unit.
12. The temperature control circuit of claim 11, wherein the heat dissipating unit further comprises a fuse; the fuse is connected between the power supply and the second end of the sixth switching tube in series.
13. The temperature control circuit of claim 11, wherein the heat dissipating unit further comprises a voltage converting unit; the voltage conversion unit is connected between the third end of the sixth switching tube and the heat dissipation unit in series.
14. The temperature control circuit according to any one of claims 1-5, wherein the temperature control circuit comprises at least two temperature sampling circuits, the temperature control circuit further comprising a second logic control unit;
the input end of the second logic control unit is connected with the output ends of the at least two second comparison circuits, the output end of the second logic control unit is connected with the heat dissipation circuit, and the second logic control unit is used for outputting second logic control signals according to the at least two second control signals to control the heat dissipation circuit to work.
15. An electronic device comprising the temperature control circuit according to any one of claims 1 to 14.
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