CN217389019U - Heating control circuit and device - Google Patents
Heating control circuit and device Download PDFInfo
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- CN217389019U CN217389019U CN202221237428.4U CN202221237428U CN217389019U CN 217389019 U CN217389019 U CN 217389019U CN 202221237428 U CN202221237428 U CN 202221237428U CN 217389019 U CN217389019 U CN 217389019U
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Abstract
The application provides a heating control circuit and a device, which comprise a temperature sampling module, a temperature sampling module and a temperature processing module, wherein the temperature sampling module is used for collecting the temperature of a monitoring equipment processor and converting the temperature into temperature sampling voltage; the threshold comparison module is connected with the output end of the temperature sampling module, compares the temperature sampling voltage with a reference voltage and outputs a comparison signal; the switch control module is connected with the output end of the threshold comparison module and outputs a switch control signal according to the level of the comparison signal; and the heating module is connected with the output end of the switch control module, forms a heating loop according to the switch control signal and heats the processor. By adopting the circuit structure, the reference voltage corresponding to the preset temperature point is compared with the temperature sampling voltage, if the temperature sampling voltage is lower than the reference voltage, the heating circuit is started, the DSP can be smoothly powered on and started and normally work at low temperature, an additional microprocessor is not needed, the control scheme is simplified, and the manufacturing cost of the heating control circuit is also reduced.
Description
Technical Field
The present disclosure relates to circuit control, and more particularly to a heating control circuit and device.
Background
At present, the outdoor working temperature range of security IPC equipment (IP CAMERA, a network CAMERA) is-40-70 ℃, the low-temperature working temperature (-30 ℃ to-40 ℃) of a DSP (Digital Signal Processing) embedded in the IPC equipment cannot be achieved, for example, the nominal temperature range of a Haisin brand DSP series is 0-70 ℃, and if the DSP is applied to the IPC equipment, the problem that the IPC equipment cannot be started easily occurs under the condition of low temperature without heating.
In the related art, most security manufacturers usually use a low temperature resistant (-40 ℃) MCU (micro controller Unit) for ambient temperature acquisition and DSP heating control, and when it is detected that the ambient temperature is not sufficient to support the DSP to work, the MCU is used to control the heating circuit to heat the DSP. However, not only the MCU needs to be additionally used, but also a corollary program needs to be developed, which increases the cost of the IPC device.
Content of application
In view of the above drawbacks of the prior art, the present application aims to provide a heating control circuit and a device thereof, which are used to solve the problem that the low temperature heating control circuit in the existing IPC device requires an additional micro-processing unit, resulting in a complicated implementation scheme and high cost.
In a first aspect, an embodiment of the present application provides a heating control circuit, including:
the temperature sampling module is used for acquiring the temperature of the monitoring equipment processor and converting the temperature into temperature sampling voltage;
the threshold comparison module is connected with the output end of the temperature sampling module, compares the temperature sampling voltage with a reference voltage and outputs a comparison signal;
the switch control module is connected with the output end of the threshold comparison module and outputs a switch control signal according to the level of the comparison signal;
and the heating module is connected with the output end of the switch control module, forms a heating loop according to the switch control signal and heats the processor.
In an embodiment of the present application, the temperature sampling module includes a first resistor and a second resistor, the first resistor and the second resistor are connected in series to form a voltage division and collection circuit, and the second resistor is a thermistor.
In an embodiment of the present application, the method further includes: and the bypass filter capacitor is connected in parallel with two ends of the thermistor.
In an embodiment of the application, the threshold comparison module includes a three-phase voltage regulator, and the three-phase voltage regulator compares the temperature sampling voltage with a reference voltage and determines whether the three-phase voltage regulator is turned on or off to output comparison signals of different levels.
In an embodiment of the present application, the method further includes: and the third resistor is connected between the output end of the voltage stabilizing source and the first power supply and is used for continuing current of the switched-on voltage stabilizing source.
In an embodiment of the present application, the method further includes: and the fourth resistor is connected with the output end of the voltage stabilizing source for current limiting.
In an embodiment of this application, the on-off control module includes first triode, second triode, fifth resistance and sixth resistance, the projecting pole and the base of first triode are connected respectively the output of threshold value comparison module, the base of second triode is connected through fifth resistance to the collecting electrode of first triode, ground connection after connecting sixth resistance between the projecting pole and the base of second triode, the collecting electrode output on-off control signal of second triode.
In an embodiment of the present application, the method further includes: and one end of the overvoltage absorption capacitor is connected with the collector of the first triode, and the other end of the overvoltage absorption capacitor is grounded.
In an embodiment of the present application, the heating module includes a connector and a heating resistor, the heating resistor is connected in series to two ends of the connector, one end of the connector is connected to the second power supply, and the other end of the connector is connected to the switch control signal.
In a second aspect, embodiments of the present application further provide a heating control device, including the heating control circuit as described in the first aspect.
In the embodiment of the application, gather the temperature of supervisory equipment treater through temperature sampling module, convert the temperature into temperature sampling voltage, through the comparison signal of the different levels of comparison temperature sampling voltage and preset reference voltage output, confirm the on-off control signal of on-off control module output according to the comparison signal, thereby whether control heating module adds heat treatment ware, adopt above-mentioned circuit structure, utilize preset temperature point to correspond reference voltage and temperature sampling voltage and compare, if temperature sampling voltage is less than reference voltage can open heating circuit, guarantee that DSP also can go up the electricity smoothly when the low temperature and start and normally work, need not extra microprocessor, not only simplify control scheme, heating control circuit's manufacturing cost has still been reduced.
Drawings
Fig. 1 is a block diagram illustrating a heating control circuit according to an embodiment of the present disclosure;
FIG. 2 is a circuit diagram of a heating control circuit according to an embodiment of the present application;
fig. 3 shows a simulation diagram of voltage control of a heating control circuit according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application and are not drawn according to the number, shape and size of the components in actual implementation, and the type, number and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Before describing the embodiments of the present application, terms referred to in the embodiments of the present application will be explained.
The three-phase voltage regulator tube can reduce the voltage and output the voltage after stabilizing the voltage to a certain fixed value (reference voltage). The three-phase voltage-stabilizing tube in the embodiment of the application can be TL431, and the TL431 is a parallel voltage-stabilizing integrated circuit, so that the three-phase voltage-stabilizing tube is widely applied to various power supply circuits due to good performance and low price. TL431 may include three poles: k pole, A pole and R pole. When the voltage difference between the R pole and the a pole is greater than the reference voltage, the TL431 enters the conducting state, and at this time, the K pole outputs the same voltage value as the voltage difference between the R pole and the a pole.
Ground (GND), the most common Ground, is generally considered as the reference Ground in the circuit, and the potential of the Ground signal is 0V.
Referring to fig. 1, a block diagram of a heating control circuit according to an embodiment of the present disclosure includes:
the temperature sampling module 1 is used for collecting the temperature of the monitoring equipment processor and converting the temperature into temperature sampling voltage;
it should be noted that the monitoring device includes, but is not limited to, a security monitor, a security monitoring device, a network camera IPC, a dome camera, and the like, and may also be applied to a processor of other outdoor devices for heating, which is not described herein again.
The processor includes, but is not limited to, a DSP digital signal processor, an MCU micro processor, an FPGA programmable logic control unit, a CPU processor, a single chip, and the like, and is not limited herein.
The threshold comparison module 2 is connected with the output end of the temperature sampling module, compares the temperature sampling voltage with a reference voltage and outputs a comparison signal;
the switch control module 3 is connected with the output end of the threshold comparison module and outputs a switch control signal according to the level of the comparison signal;
and the heating module 4 is connected with the output end of the switch control module, forms a heating loop according to the switch control signal and heats the processor.
With reference to fig. 2 in detail, a circuit diagram of a heating control circuit provided in the embodiment of the present application is detailed as follows:
the temperature sampling module 1 includes a first resistor R1 and a second resistor R2, the first resistor R1 and the second resistor R2 are connected in series to form a voltage division acquisition circuit, for example, one end of the first resistor R1 is connected to a first power supply 5V, the other end of the first resistor R1 is connected to one end of a second resistor R2, the other end of the second resistor R2 is grounded, and the first resistor R1 and the second resistor R2 divide the voltage of the first power supply 5V to be used as the voltage input of the three-phase voltage stabilizer D1.
The second resistor R2 is a thermistor, for example, the second resistor R2 is a ± 1% high-precision NTC thermistor, wherein the NTC thermistor is a negative temperature coefficient resistor (power type thermistor), the resistance value of which decreases with the increase of temperature, and is widely applied to scenes such as switching power supplies, module power supplies, temperature sensors, power supplies, electronic ballasts, automatic regulation heating, and the like.
Specifically, when the collected temperature of the processor is reduced, the resistance value of the second resistor R2 is increased, the voltage value input by the three-phase voltage stabilizer D1 obtained after voltage division is also increased, and the conversion from temperature change to a voltage signal is realized, so that the temperature is accurately reflected by the temperature sampling voltage.
On the basis of the above embodiment, the temperature sampling module 1 further includes: and the bypass filter capacitor C1 is connected with the bypass filter C1 capacitor in parallel at two ends of the thermistor R2, and the bypass filter capacitor C1 is used for filtering out bypass noise interference.
In some embodiments, the threshold comparison module 2 comprises a three-phase voltage regulator D1, and the three-phase voltage regulator D1 compares the temperature sampling voltage with a reference voltage and determines whether the three-phase voltage regulator is switched on or off to output comparison signals with different levels.
Specifically, the temperature sampling voltage is determined by the resistance value of the second resistor R2, and compared with a reference voltage preset by the three-phase voltage stabilization source D1, such as 2.5V, when the temperature sampling voltage is greater than the reference voltage, a high-level comparison signal is output, conversely, when the temperature sampling voltage is not greater than the reference voltage, i.e., the temperature sampling voltage is not conducted, a low-level comparison signal is output, and only the high-level comparison signal can conduct the first triode, so as to control the switch control signal output by the switch control module.
On the basis of the above embodiment, the threshold comparison module 2 further includes: and the third resistor R3 is connected between the output end of the voltage stabilizing source and the first power supply and is used for continuing current of the voltage stabilizing source after being conducted.
On the basis of the above embodiment, the threshold comparison module 2 further includes: and the fourth resistor R4 is connected to the output end of the voltage stabilizing source for current limiting.
Here, it should be noted that the threshold comparing module 2 may further include: the temperature sampling circuit comprises a third resistor R3, a fourth resistor R4, a three-phase voltage-stabilizing source D1 and a first triode (PNP triode) Q1, wherein the D1 is a three-end precise voltage-stabilizing source (three-phase voltage-stabilizing source), the reference voltage of the three-phase voltage-stabilizing source is 2.5V, the reference voltage is the comparison voltage corresponding to the temperature sampling voltage, when the temperature sampling voltage is lower than 2.5V, the three-phase voltage-stabilizing source D1 is cut off, the voltage of an emitter electrode of the PNP triode Q1 is equal to the voltage of a base electrode, and the first triode Q1 is cut off. When the temperature sampling voltage exceeds 2.5V, the three-phase voltage-stabilizing source D1 is conducted, so that the emitter voltage of the PNP triode Q1 is higher than the base voltage, and the PNP triode Q1 is conducted. The third resistor R3 provides freewheeling for reliable conduction of the three-phase regulator D1. The fourth resistor R4 is a resistor that limits the current of the PNP transistor Q1 when it is turned on.
In some embodiments, the switching control module 3 includes a first transistor Q1, a second transistor Q2, a fifth resistor R5, and a sixth resistor R6, an emitter and a base of the first transistor Q1 are respectively connected to the output terminal of the threshold comparison module 2, a collector of the first transistor Q1 is connected to the base of the second transistor Q2 through a fifth resistor R5, the sixth resistor R6 is connected between the emitter and the base of the second transistor Q2 and then grounded, and the collector of the second transistor Q2 outputs the switching control signal.
The first transistor Q1 and the second transistor Q2 are both PNP transistors, and the switching purpose is achieved by controlling the on or off state of the PNP transistors.
Specifically, when the first transistor Q1 is turned off, the base voltage of the second transistor Q2 is pulled down to ground by the sixth resistor R6, and the second transistor Q2 is turned off. When the first transistor Q1 is turned on, the base voltage of the second transistor Q2 is pulled high by 5V through the fifth resistor R5, the second transistor Q2 is turned on, and the collector voltage of the second transistor Q2 is changed from 12V to 0V.
On the basis of the above embodiment, the switch control module 3 further includes: one end of the overvoltage absorption capacitor C2 is connected with the collector of the first triode, and the other end of the overvoltage absorption capacitor C2 is grounded and used for absorbing the overshoot voltage generated when the first triode Q1 is switched on and off.
In some embodiments, the heating module includes a connector J1 and a heating resistor R7, the heating resistor R7 is connected in series to two ends of the connector J1, one end of the connector J1 is connected to the second power supply 12V, and the other end of the connector J1 is connected to the switch control signal.
Specifically, when the collector voltage of the second transistor Q2 changes from 12V to 0V, the voltage difference across the heating resistor R7 changes from 0V to 12V, and the heating resistor R7 is turned on to start heating. Wherein, J1 is a connector (i.e. connector), generally two PIN (PIN node), and the PIN flow of the connector J1 is not less than 1A; heating resistor R7 is silica gel heating plate formula resistance, can use M3 glue convenient paste near the position of treater (DSP) at the core panel beating, and general power is not less than 6W to under predetermineeing low temperature state, control heating resistor heats the treater.
In this way, need not extra chip or treater, utilize temperature sampling circuit to gather temperature sampling voltage, compare temperature sampling voltage with predetermineeing the temperature point, if temperature sampling voltage is less than the reference voltage that predetermineeing the temperature point and correspond, can heat the treater, through accurate heating circuit that opens, guarantee that DSP also can go up the electricity smoothly when the low temperature and start and normally work, need not extra microprocessor, not only simplified control scheme, still reduced heating control circuit's manufacturing cost.
The working principle is as follows:
with particular reference to fig. 3, a simulation diagram of voltage control of a heating control circuit provided in this embodiment of the present application is shown, wherein as the temperature of the monitoring device decreases, the impedance of the second resistor R2 increases, the divided voltage V1 across the second resistor R2 also increases, when the voltage across the second resistor R2 exceeds the reference voltage by 2.5V, the three-phase voltage regulator D1 is turned on, the following control switch, the first transistor Q1 and the second transistor Q2, are turned on synchronously, the collector voltage V2 of the second transistor Q2 drops from 12V to about 0V, and the seventh resistor R7 is turned on to start heating the processor DSP.
In the embodiment, the outdoor IPC equipment can use the scheme to heat the DSP, so that the risk that the DSP cannot be started in a low-temperature state is avoided, and the heating control circuit is low in cost, simple to control and reliable in performance.
In other embodiments of the present application, a heating control device is further provided, which includes the above-mentioned heating control circuit, and is not described herein again.
This application is through the temperature of temperature sampling module collection supervisory equipment treater, convert the temperature into temperature sampling voltage, through the comparison signal of the different levels of comparison temperature sampling voltage and predetermined reference voltage output, confirm the on-off control signal of on-off control module output according to the comparison signal, thereby whether control heating module adds heat treatment ware, adopt above-mentioned circuit structure, utilize the corresponding reference voltage of predetermined temperature point to compare with temperature sampling voltage, if temperature sampling voltage is less than reference voltage can accurately open heating circuit, guarantee that DSP also can go up the electricity smoothly when the low temperature and start and normally work, need not extra microprocessor, not only simplify control scheme, heating control circuit's manufacturing cost has still been reduced.
The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.
Claims (10)
1. A heating control circuit, comprising:
the temperature sampling module is used for acquiring the temperature of the monitoring equipment processor and converting the temperature into temperature sampling voltage;
the threshold comparison module is connected with the output end of the temperature sampling module, compares the temperature sampling voltage with a reference voltage and outputs a comparison signal;
the switch control module is connected with the output end of the threshold comparison module and outputs a switch control signal according to the level of the comparison signal;
and the heating module is connected with the output end of the switch control module, forms a heating loop according to the switch control signal and heats the processor.
2. The heating control circuit according to claim 1, wherein the temperature sampling module comprises a first resistor and a second resistor, the first resistor and the second resistor are connected in series to form a voltage division acquisition circuit, and the second resistor is a thermistor.
3. The heating control circuit of claim 2, further comprising: and the bypass filter capacitor is connected in parallel with two ends of the thermistor.
4. The heating control circuit according to claim 1, wherein the threshold comparison module comprises a three-phase voltage regulator source, and the three-phase voltage regulator source compares the temperature sampling voltage with a reference voltage and determines that the three-phase voltage regulator source is switched on or switched off to output comparison signals with different levels.
5. The heating control circuit of claim 4, further comprising: and the third resistor is connected between the output end of the voltage stabilizing source and the first power supply and is used for continuing current of the switched-on voltage stabilizing source.
6. The heating control circuit of claim 5, further comprising: and the fourth resistor is connected with the output end of the voltage stabilizing source for current limiting.
7. The heating control circuit according to claim 1, wherein the switching control module comprises a first transistor, a second transistor, a fifth resistor and a sixth resistor, an emitter and a base of the first transistor are respectively connected to the output terminal of the threshold comparison module, a collector of the first transistor is connected to a base of the second transistor through the fifth resistor, the sixth resistor is connected between the emitter and the base of the second transistor and then grounded, and the collector of the second transistor outputs the switching control signal.
8. The heating control circuit of claim 7, further comprising: and one end of the overvoltage absorption capacitor is connected with the collector of the first triode, and the other end of the overvoltage absorption capacitor is grounded.
9. The heating control circuit according to any one of claims 1 to 7, wherein the heating module comprises a connector and a heating resistor, the heating resistor is connected in series with two ends of the connector, one end of the connector is connected with a second power supply, and the other end of the connector is connected with the switch control signal.
10. A heating control device comprising the heating control circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221237428.4U CN217389019U (en) | 2022-05-20 | 2022-05-20 | Heating control circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221237428.4U CN217389019U (en) | 2022-05-20 | 2022-05-20 | Heating control circuit and device |
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| Publication Number | Publication Date |
|---|---|
| CN217389019U true CN217389019U (en) | 2022-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221237428.4U Active CN217389019U (en) | 2022-05-20 | 2022-05-20 | Heating control circuit and device |
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|---|---|
| CN (1) | CN217389019U (en) |
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- 2022-05-20 CN CN202221237428.4U patent/CN217389019U/en active Active
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