CN215895320U - Temperature control circuit and heating device - Google Patents
Temperature control circuit and heating device Download PDFInfo
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- CN215895320U CN215895320U CN202121005386.7U CN202121005386U CN215895320U CN 215895320 U CN215895320 U CN 215895320U CN 202121005386 U CN202121005386 U CN 202121005386U CN 215895320 U CN215895320 U CN 215895320U
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Abstract
The utility model discloses a temperature control circuit and a heating device, wherein the temperature control circuit comprises a temperature detection module, a driving module, a microcontroller and a PTC heating element; the heating device is provided with the temperature control circuit. The implementation of the utility model is beneficial to reducing the manufacturing cost of the temperature control circuit and the daily maintenance cost of the temperature control circuit.
Description
Technical Field
The utility model relates to the technical field of heating devices, in particular to a temperature control circuit and a heating device.
Background
In the heating device, a thyristor or an MOS transistor is commonly used as a switching element, and the frequency of conduction of the thyristor or the MOS transistor is controlled by a microcontroller, so as to control the frequency of power-on and power-off of the heating element, thereby realizing control of the heating temperature of the heating element. However, practice has found that the thyristor or the MOS transistor is easily damaged by transient current or voltage impact during conduction, and the thyristor or the MOS transistor needs to be replaced frequently, which makes the routine maintenance cost of the circuit high.
Therefore, how to improve the structure of the temperature control circuit to reduce the daily maintenance cost thereof is a technical problem which needs to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a temperature control circuit and a heating device, which are beneficial to reducing the daily maintenance cost.
In order to solve the above technical problems, a first aspect of the present invention discloses a temperature control circuit, comprising a temperature detection module, a driving module, a microcontroller and a PTC heater, wherein,
the temperature detection module is provided with a temperature probe, one end of the temperature probe is electrically connected with a first direct current power supply, and the other end of the temperature probe is electrically connected with the input end of the microcontroller;
the driving module is provided with an electromagnetic relay, one end of a coil of the electromagnetic relay is electrically connected with a second direct-current power supply, the other end of the coil of the electromagnetic relay is electrically connected with the output end of the microcontroller, one contact of the electromagnetic relay is electrically connected with a zero line end of an alternating-current power supply, the other contact of the electromagnetic relay is electrically connected with one end of the PTC heating element, and the other end of the PTC heating element is electrically connected with a fire line end of the alternating-current power supply;
when the microcontroller controls the coil to be electrified, the electromagnetic relay is in a closed state, so that the PTC heating body works.
It can be seen that, in the first aspect of the present invention, the microcontroller controls the on/off of the coil of the electromagnetic relay in the driving module to control whether the PTC heating element performs the heating operation, and compared with the thyristor or the MOS transistor used in the prior art, the electromagnetic relay is used as the switching element, which is beneficial to reducing the manufacturing cost of the temperature control circuit and the daily maintenance cost of the temperature control circuit. Furthermore, the temperature control circuit is provided with a temperature detection module electrically connected with the microcontroller, so that the temperature of a medium to be heated by the PTC heating body can be detected, and the microcontroller can be controlled based on the detected temperature.
In an alternative embodiment, in the first aspect of the present invention, the temperature detection module includes a first interface provided with two connection terminals, and the temperature probe is electrically connected to the temperature detection module through the first interface, wherein,
the first connecting end of the first interface is electrically connected with the first direct current power supply, and the second connecting end of the first interface is electrically connected with the input end of the microcontroller.
In an optional implementation manner, in the first aspect of the present invention, the temperature detection module further includes a first pull-down resistor connected to the second connection terminal of the first interface, and a first capacitor connected in parallel with the first pull-down resistor.
In a first aspect of the utility model, as an alternative embodiment, two PTC heating bodies are provided, and two electromagnetic relays are provided, wherein,
one end of a coil of a first electromagnetic relay is electrically connected with a second direct-current power supply, the other end of the coil of the first electromagnetic relay is electrically connected with one output end of the microcontroller, one contact of the first electromagnetic relay is electrically connected with a zero line end of an alternating-current power supply, the other contact of the first electromagnetic relay is electrically connected with one end of a first PTC heating body, and the other end of the first PTC heating body is electrically connected with a fire wire end of the alternating-current power supply;
one end of the coil of the second electromagnetic relay is electrically connected with the second direct-current power supply, the other end of the coil of the second electromagnetic relay is electrically connected with another output end of the microcontroller, one contact of the second electromagnetic relay is electrically connected with a zero line end of the alternating-current power supply, the other contact of the second electromagnetic relay is electrically connected with one end of the second PTC heating body, and the other end of the second PTC heating body is electrically connected with a fire line end of the alternating-current power supply.
As an optional implementation manner, in the first aspect of the present invention, the driving module further includes a driving chip with a model number of ULN2001D, wherein,
one end of the coil of the first electromagnetic relay is electrically connected with the second direct-current power supply, the other end of the coil of the first electromagnetic relay is electrically connected with the eighth pin of the driving chip,
one end of the coil of the second electromagnetic relay is electrically connected with the second direct-current power supply, the other end of the coil of the second electromagnetic relay is electrically connected with the seventh pin of the driving chip,
the fifth pin of the driving chip is electrically connected with the second direct current power supply,
the first pin and the second pin of the driving chip are respectively and electrically connected with two output ends of the microcontroller,
and a fourth pin of the driving chip is grounded.
As an optional implementation manner, in the first aspect of the present invention, the first pin and the second pin of the driving chip U4 are respectively connected to a second pull-down resistor.
In an alternative embodiment, in the first aspect of the present invention, the driving module further includes a first diode and a second diode, wherein,
the anode of the first diode is electrically connected with the second direct-current power supply, and the cathode of the first diode is electrically connected with the eighth pin of the driving chip;
and the anode of the second diode is electrically connected with the second direct-current power supply, and the cathode of the second diode is electrically connected with the seventh pin of the driving chip.
In an alternative embodiment, in the first aspect of the present invention, the PTC heating element is connected to the temperature control circuit through a second interface, the second interface is provided with three connection terminals,
one contact of the first electromagnetic relay is electrically connected with a zero line end of the alternating current power supply, and the other contact of the first electromagnetic relay is electrically connected with one end of the first PTC heating element through the first connecting end of the second interface;
the other end of the first PTC heating element is electrically connected with a fire wire end of the alternating current power supply through a second connecting end of the second interface;
one contact of the second electromagnetic relay is electrically connected with a zero line end of the alternating current power supply, and the other contact of the second electromagnetic relay is electrically connected with one end of the second PTC heating element through a third connecting end of the second interface;
the other end of the second PTC heating body is electrically connected with a fire wire end of the alternating current power supply through a second connecting end of the second interface.
In a second aspect of the utility model, a heating device is disclosed, which is provided with a temperature control circuit as described in the first aspect of the utility model.
It can be seen that, in the second aspect of the present invention, the microcontroller controls the on/off of the coil of the electromagnetic relay in the driving module to control whether the PTC heating element performs the heating operation, and compared with the thyristor or the MOS transistor adopted in the prior art, the electromagnetic relay is adopted as the switching element, which is beneficial to reducing the manufacturing cost of the temperature control circuit and the daily maintenance cost of the temperature control circuit. Furthermore, the temperature control circuit is provided with a temperature detection module electrically connected with the microcontroller, so that the temperature of a medium to be heated by the PTC heating body can be detected, and the microcontroller can be controlled based on the detected temperature.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a temperature control circuit according to an embodiment of the present invention;
FIG. 2 is a circuit schematic of the temperature sensing module shown in FIG. 1;
fig. 3 is a circuit schematic of the driving module shown in fig. 1.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms first, second and the like in the description and in the claims of the present invention are used for distinguishing between different objects and not for describing a particular order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the utility model. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
A temperature control circuit disclosed in an embodiment of the first aspect of the present invention, as shown in fig. 1, includes a temperature detection module, a driving module, a microcontroller, and a PTC heating element, wherein,
the temperature detection module is provided with a temperature probe, one end of the temperature probe is electrically connected with the first direct current power supply, and the other end of the temperature probe is electrically connected with the input end of the microcontroller;
the driving module is provided with an electromagnetic relay, one end of a coil of the electromagnetic relay is electrically connected with the second direct-current power supply, the other end of the coil of the electromagnetic relay is electrically connected with the output end of the microcontroller, one contact of the electromagnetic relay is electrically connected with a zero line end of the alternating-current power supply, the other contact of the electromagnetic relay is electrically connected with one end of the PTC heating element, and the other end of the PTC heating element is electrically connected with a fire line end of the alternating-current power supply;
when the microcontroller controls the coil to be electrified, the electromagnetic relay is in a closed state, so that the PTC heating element works.
In the embodiment of the utility model, the temperature detection module detects the temperature of a medium (for example, drinking water) heated by the PTC heating element through the temperature probe.
In the embodiment of the utility model, the microcontroller controls the coil of the electromagnetic relay in the driving module to be electrified, so that the electromagnetic relay is in a closed state (namely two contacts are closed), the PTC heating element is communicated with the alternating current power supply, the alternating current power supply supplies power to the PTC heating element, the PTC heating element works, and the medium is heated; the microcontroller controls the coil of the electromagnetic relay in the driving module to be powered off, so that the electromagnetic relay is in a normally open state (namely, the two contacts are disconnected), the PTC heating body is disconnected with the alternating current power supply, and the PTC heating body is powered off.
In the embodiment of the present invention, the microcontroller may optionally use a chip with a model number of SC92F84a 3.
In the embodiment of the present invention, optionally, in the last stage, the microcontroller may control whether the electromagnetic relay of the driving module is powered on according to the temperature of the medium (for example, drinking water) heated by the PTC heating element detected by the temperature detection module, so as to control whether two contacts of the electromagnetic relay are closed, further control whether the PTC heating element is connected with the ac power supply, and control whether the PTC heating embodying stage heats the medium. Further, the control process can be executed circularly, so that the circulating control of the temperature is realized. It should be noted that the above control process, which relates to the software program for the microcontroller to process the electrical signal, does not belong to the scope of the present invention. Based on the temperature control circuit disclosed by the embodiment of the utility model, in the control process, the transmission of the related electric signals mainly comprises the following steps: the temperature detection module inputs an electric signal representing the temperature of a medium (such as drinking water) heated by the PTC heating element detected by the temperature probe to the input end of the microcontroller; the output end of the microcontroller outputs an electric signal for controlling the coil of the electromagnetic relay to be electrified or deenergized to the driving module.
It can be seen that, in the embodiment of the first aspect of the present invention, the microcontroller controls the on/off of the coil of the electromagnetic relay in the driving module to control whether the PTC heating element performs the heating operation, and compared with the thyristor or the MOS transistor adopted in the prior art, the electromagnetic relay is adopted as the switching element, which is beneficial to reducing the manufacturing cost of the temperature control circuit and the daily maintenance cost of the temperature control circuit. Furthermore, the temperature control circuit is provided with a temperature detection module electrically connected with the microcontroller, so that the temperature of a medium to be heated by the PTC heating body can be detected, and the microcontroller can be controlled based on the detected temperature.
In some embodiments of the present invention, as shown in fig. 2, the temperature detecting module includes a first interface NTC1 provided with two connection terminals, and the temperature probe is electrically connected in the temperature detecting module through the first interface NTC1, wherein,
a first connection terminal (connection terminal 1 in the first interface NTC1 in fig. 2) of the first interface NTC1 is electrically connected to the first direct current power supply (terminal +5V in fig. 2), and a second connection terminal (connection terminal 2 in the first interface NTC1 in fig. 2) of the first interface NTC1 is electrically connected to the input terminal AD of the microcontroller.
Through setting up first interface NTC1 for temperature probe passes through first interface NTC1 electrical connection in this temperature detect module, makes between temperature probe and this temperature detect module dismantled and assembled, on the one hand, is favorable to the split transportation, the purchase of this temperature control circuit production manufacturing in-process, thereby is favorable to the convenience of manufacturing, and on the other hand is favorable to the convenience of the change temperature probe of this temperature control circuit's routine maintenance in-process.
In this embodiment, optionally, the voltage output by the first direct current power supply is 5V, wherein the first direct current power supply may be used to power the temperature detection module and the microcontroller.
In this embodiment, as shown in fig. 2, the temperature sensing module further includes a first pull-down resistor R26 connected to the second connection terminal (connection terminal 2 in the first interface NTC1 in fig. 2) of the first interface NTC1 and a first capacitor C8 connected in parallel with the first pull-down resistor R26. The first pull-down resistor R26 is arranged to make the signal at the second connection terminal (the connection terminal 2 in the first interface NTC1 in fig. 2) be at a low level, that is, the input terminal electrically connected to the microcontroller and the temperature probe is normally at a low level, which is beneficial to improving the noise tolerance of the input signal of the microcontroller and increasing the anti-interference capability thereof; the first capacitor C8 is provided to filter the input signal to the microcontroller.
In some embodiments of the present invention, two PTC heaters are provided and two electromagnetic relays are provided, wherein, as shown in fig. 3,
one end of the coil of the first electromagnetic relay REL1 is electrically connected with the second direct current power supply (the +12V end in fig. 3), the other end of the coil of the first electromagnetic relay REL1 is electrically connected with one output end PTC1 of the microcontroller, one contact (the contact 2 of REL1 in fig. 3) of the first electromagnetic relay REL1 is electrically connected with the zero line end ACN of the alternating current power supply, the other contact (the contact 1 of REL1 in fig. 3) of the first electromagnetic relay REL1 is electrically connected with one end of the first PTC heating element, and the other end of the first PTC heating element is electrically connected with the fire line end ACL of the alternating current power supply;
one end of the coil of the second electromagnetic relay REL2 is electrically connected to the second dc power supply (the +12V end in fig. 3), the other end of the coil of the second electromagnetic relay REL2 is electrically connected to the other output terminal PTC2 of the microcontroller, one contact of the second electromagnetic relay REL2 (the contact 2 of REL2 in fig. 3) is electrically connected to the neutral terminal ACN of the ac power supply, the other contact of the second electromagnetic relay REL2 (the contact 1 of REL2 in fig. 3) is electrically connected to one end of the second PTC heater, and the other end of the second PTC heater is electrically connected to the fire terminal ACL of the ac power supply.
In this embodiment, two PTC heating elements and correspondingly two electromagnetic relays are provided to respectively switch the power on/off states of the two PTC heating elements, and specifically, the power on/off states of the two PTC heating elements are independent of each other. This makes this temperature control circuit can control two PTC heat-generating bodies work respectively to realize the switching of different heating gears. Specifically, when the first PTC heat-generating body and the second PTC heat-generating body have the same power, the medium can be heated under the first heating range condition when the temperature control circuit controls so that only the first PTC heat-generating body operates or only the second PTC heat-generating body operates, and the medium can be heated under the second heating range condition when the temperature control circuit controls so that the first PTC heat-generating body and the second PTC heat-generating body operate simultaneously. It is to be understood that the power of the first PTC heating element and the power of the second PTC heating element may be different, and are not described herein.
In this embodiment, optionally, the driving module further includes a driving chip U4 with a model number ULN2001D, wherein, as shown in fig. 3,
one end of the coil of the first electromagnetic relay REL1 is electrically connected to the second dc power supply (the +12V terminal in fig. 3), the other end of the coil of the first electromagnetic relay REL1 is electrically connected to the eighth pin of the driving chip U4,
one end of the coil of the second electromagnetic relay REL2 is electrically connected to the second dc power supply (terminal +12V in fig. 3), the other end of the coil of the second electromagnetic relay REL2 is electrically connected to the seventh pin of the driving chip U4,
the fifth pin of the driver chip U4 is electrically connected to the second dc power supply (terminal +12V in figure 3),
the first pin and the second pin of the driving chip U4 are respectively and electrically connected with two output ends PTC1 and PTC2 of the microcontroller,
the fourth pin of the driver chip U4 is grounded.
In this embodiment, the driving chip U4 of the ULN2001D is a three-channel relay driving chip, and compared with a relay driving chip which needs to be provided with a corresponding driving circuit, the driving chip U4 is adopted, which is beneficial to realizing the integration of the circuit, and is further beneficial to the miniaturization of the temperature control circuit.
In this embodiment, optionally, the output voltage of the second dc power supply (at the +12V terminal in fig. 3) is 12V, and may be used to supply power to the driving module.
In this embodiment, optionally, as shown in fig. 3, the first pin and the second pin of the driver chip U4 are respectively connected to a second pull-down resistor R27 and R28.
The second pull-down resistors R27 and R28 are arranged to make signals at the first pin and the second pin of the driver chip U4 be at low levels, that is, the output terminal electrically connected to the microcontroller and the driver chip U4 is at low levels in a normal state, which is beneficial to improving the noise margin of the input signal of the microcontroller and increasing the anti-interference capability thereof.
In this embodiment, optionally, as shown in fig. 3, the driving module further includes a first diode D5 and a second diode D6, wherein,
the anode of the first diode D5 is electrically connected to the second dc power supply (terminal +12V in fig. 3), and the cathode of the first diode D5 is electrically connected to the eighth pin of the driver chip U4;
the anode of the second diode D6 is electrically connected to the second dc power supply (terminal +12V in fig. 3), and the cathode of the second diode D6 is electrically connected to the seventh pin of the driver chip U4.
The arrangement of the first diode D5 and the second diode D6 is beneficial to reduce the risk of the driving chip U4 being damaged by the reverse rush current occurring in the second dc power supply (the +12V terminal in fig. 3).
In this embodiment, optionally, as shown in fig. 3, the PTC heating element is connected to the temperature control circuit through a second interface PTCX, which is provided with three connection terminals,
one contact (contact 2 of REL1 in fig. 3) of the first electromagnetic relay REL1 is electrically connected to the neutral terminal ACN of the ac power supply, and the other contact (contact 1 of REL1 in fig. 3) of the first electromagnetic relay REL1 is electrically connected to one end of the first PTC heating element through the first connection terminal (connection terminal 1 in the second interface PTCX in fig. 3) of the second interface PTCX;
the other end of the first PTC heating element is electrically connected to a fire wire end ACL of the ac power supply through a second connection end (connection end 2 in the second interface PTCX in fig. 3) of the second interface PTCX;
one contact (contact 2 of REL2 in fig. 3) of the second electromagnetic relay REL2 is electrically connected to the neutral terminal of the ac power supply, and the other contact (contact 1 of REL2 in fig. 3) of the second electromagnetic relay REL2 is electrically connected to one end of the second PTC heating element through the third connection terminal (connection terminal 3 in the second interface PTCX in fig. 3) of the second interface PTCX;
the other end of the second PTC heating element is electrically connected to the live wire terminal of the ac power supply through the second connection terminal (connection terminal 2 in the second interface PTCX in fig. 3) of the second interface PTCX.
Second interface PTCX's setting for between first PTC heat-generating body and second interface PTCX, second PTC heat-generating body and the second interface PTCX, it is removable respectively, on the one hand, be favorable to the split transportation, the purchase in this temperature control circuit production manufacturing process, thereby be favorable to the convenience of manufacturing, on the other hand, be favorable to the convenience of the first PTC heat-generating body of change and/or second PTC heat-generating body in this temperature control circuit's routine maintenance process.
In a second embodiment of the utility model, a heating device is disclosed, which is provided with the temperature control circuit according to the first aspect of the utility model.
It can be seen that, in the embodiment of the second aspect of the present invention, the microcontroller controls the on/off of the coil of the electromagnetic relay in the driving module to control whether the PTC heating element performs the heating operation, and compared with the thyristor or the MOS transistor adopted in the prior art, the electromagnetic relay is adopted as the switching element, which is beneficial to reducing the manufacturing cost of the temperature control circuit and the daily maintenance cost of the temperature control circuit. Furthermore, the temperature control circuit is provided with a temperature detection module electrically connected with the microcontroller, so that the temperature of a medium to be heated by the PTC heating body can be detected, and the microcontroller can be controlled based on the detected temperature.
Finally, it should be noted that: the temperature control circuit and the heating device disclosed in the embodiments of the present invention are only preferred embodiments of the present invention, and are only used for illustrating the technical solutions of the present invention, not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. A temperature control circuit is characterized by comprising a temperature detection module, a drive module, a microcontroller and a PTC heating element, wherein,
the temperature detection module is provided with a temperature probe, one end of the temperature probe is electrically connected with a first direct current power supply, and the other end of the temperature probe is electrically connected with the input end of the microcontroller;
the driving module is provided with an electromagnetic relay, one end of a coil of the electromagnetic relay is electrically connected with a second direct-current power supply, the other end of the coil of the electromagnetic relay is electrically connected with the output end of the microcontroller, one contact of the electromagnetic relay is electrically connected with a zero line end of an alternating-current power supply, the other contact of the electromagnetic relay is electrically connected with one end of the PTC heating element, and the other end of the PTC heating element is electrically connected with a fire line end of the alternating-current power supply;
when the microcontroller controls the coil to be electrified, the electromagnetic relay is in a closed state, so that the PTC heating body works.
2. The temperature control circuit of claim 1, wherein the temperature detection module comprises a first interface provided with two connection terminals, the temperature probe being electrically connected in the temperature detection module through the first interface, wherein,
the first connecting end of the first interface is electrically connected with the first direct current power supply, and the second connecting end of the first interface is electrically connected with the input end of the microcontroller.
3. The temperature control circuit of claim 2, wherein the temperature sensing module further comprises a first pull-down resistor connected to the second connection terminal of the first interface and a first capacitor connected in parallel with the first pull-down resistor.
4. The temperature control circuit according to claim 1, wherein the PTC heat-generating body is provided in two, and the electromagnetic relay is provided in two, wherein,
one end of a coil of a first electromagnetic relay is electrically connected with a second direct-current power supply, the other end of the coil of the first electromagnetic relay is electrically connected with one output end of the microcontroller, one contact of the first electromagnetic relay is electrically connected with a zero line end of an alternating-current power supply, the other contact of the first electromagnetic relay is electrically connected with one end of a first PTC heating body, and the other end of the first PTC heating body is electrically connected with a fire wire end of the alternating-current power supply;
one end of the coil of the second electromagnetic relay is electrically connected with the second direct-current power supply, the other end of the coil of the second electromagnetic relay is electrically connected with another output end of the microcontroller, one contact of the second electromagnetic relay is electrically connected with a zero line end of the alternating-current power supply, the other contact of the second electromagnetic relay is electrically connected with one end of the second PTC heating body, and the other end of the second PTC heating body is electrically connected with a fire line end of the alternating-current power supply.
5. The temperature control circuit of claim 4, wherein the driver module further comprises a driver chip of type ULN2001D, wherein,
one end of the coil of the first electromagnetic relay is electrically connected with the second direct-current power supply, the other end of the coil of the first electromagnetic relay is electrically connected with the eighth pin of the driving chip,
one end of the coil of the second electromagnetic relay is electrically connected with the second direct-current power supply, the other end of the coil of the second electromagnetic relay is electrically connected with the seventh pin of the driving chip,
the fifth pin of the driving chip is electrically connected with the second direct current power supply,
the first pin and the second pin of the driving chip are respectively and electrically connected with two output ends of the microcontroller,
and a fourth pin of the driving chip is grounded.
6. The temperature control circuit of claim 5, wherein the first pin and the second pin of the driver chip are respectively connected to a second pull-down resistor.
7. The temperature control circuit of claim 5, wherein the drive module further comprises a first diode and a second diode, wherein,
the anode of the first diode is electrically connected with the second direct-current power supply, and the cathode of the first diode is electrically connected with the eighth pin of the driving chip;
and the anode of the second diode is electrically connected with the second direct-current power supply, and the cathode of the second diode is electrically connected with the seventh pin of the driving chip.
8. The temperature control circuit according to claim 4, wherein the PTC heating element is connected to the temperature control circuit through a second interface provided with three connection terminals,
one contact of the first electromagnetic relay is electrically connected with a zero line end of the alternating current power supply, and the other contact of the first electromagnetic relay is electrically connected with one end of the first PTC heating element through the first connecting end of the second interface;
the other end of the first PTC heating element is electrically connected with a fire wire end of the alternating current power supply through a second connecting end of the second interface;
one contact of the second electromagnetic relay is electrically connected with a zero line end of the alternating current power supply, and the other contact of the second electromagnetic relay is electrically connected with one end of the second PTC heating element through a third connecting end of the second interface;
the other end of the second PTC heating body is electrically connected with a fire wire end of the alternating current power supply through a second connecting end of the second interface.
9. A heating device, characterized in that the heating device is provided with a temperature control circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121005386.7U CN215895320U (en) | 2021-05-12 | 2021-05-12 | Temperature control circuit and heating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121005386.7U CN215895320U (en) | 2021-05-12 | 2021-05-12 | Temperature control circuit and heating device |
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| CN215895320U true CN215895320U (en) | 2022-02-22 |
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| CN202121005386.7U Active CN215895320U (en) | 2021-05-12 | 2021-05-12 | Temperature control circuit and heating device |
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