CN112312592B - Heating circuit, heating cup and vehicle-mounted heater - Google Patents
Heating circuit, heating cup and vehicle-mounted heater Download PDFInfo
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- CN112312592B CN112312592B CN201910715263.3A CN201910715263A CN112312592B CN 112312592 B CN112312592 B CN 112312592B CN 201910715263 A CN201910715263 A CN 201910715263A CN 112312592 B CN112312592 B CN 112312592B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0236—Industrial applications for vehicles
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Abstract
The invention discloses a heating circuit, a heating cup body and a vehicle-mounted heater, wherein the heating circuit comprises a power supply detection circuit, a microcontroller and a plurality of heating loops; the power supply detection circuit and the heating loop are connected with the microcontroller, wherein the power supply detection circuit is used for acquiring power supply parameters of the current power supply; and the microcontroller is used for judging the power type of the current power supply according to the power supply parameters, determining a corresponding target heating loop according to the power supply type, and connecting the current power supply with the target heating loop so as to heat the target area through the target heating loop. According to the technical scheme, when the current power supply is the commercial power supply, the heating circuit corresponding to the commercial power supply is adopted for heating according to the current power supply types, such as the commercial power supply, the direct current power supply and the like, and when the current power supply is the direct current power supply, the heating circuit corresponding to the direct current power supply is adopted for heating, so that the heating circuit can be compatible with different power supply types, and the heater is prevented from being damaged.
Description
Technical Field
The invention relates to the technical field of heaters, in particular to a heating circuit, a heating cup body and a vehicle-mounted heater.
Background
With the popularization of automobiles, the automobile self-driving tour is more and more popular with automobile families. The vehicle-mounted heater is convenient to carry and use, becomes a preferred choice for the self-driving trip, and is increasingly popularized in automobiles.
The existing vehicle-mounted heater adopts commercial power as a power supply or adopts a vehicle-mounted power supply as a power supply, and the vehicle-mounted heater is single in power supply and cannot be compatible with the commercial power or the vehicle-mounted power supply. When a user uses the heater, the user is easy to misuse the commercial power to supply power to the heater adopting the vehicle-mounted power supply, which can cause the damage of the heater.
Disclosure of Invention
The invention mainly aims to provide a heating circuit, aiming at realizing compatibility between a mains supply and a vehicle-mounted power supply and avoiding damage to a heater.
In order to achieve the purpose, the heating circuit provided by the invention comprises a power supply detection circuit, a microcontroller and a plurality of heating loops; the power supply detection circuit and the heating loop are connected with the microcontroller, wherein
The power supply detection circuit is used for acquiring power supply parameters of the current power supply;
the microcontroller is used for judging the power type of the current power supply according to the power supply parameters, determining a corresponding target heating loop according to the power supply type, and connecting the current power supply with the target heating loop so as to heat a target area through the target heating loop.
Preferably, the power supply detection circuit is further configured to count the voltage zero-crossing times of the current power supply in unit time, and use the voltage zero-crossing times as power supply parameters;
the microcontroller is further used for determining the voltage frequency of the current power supply according to the voltage zero-crossing times, and determining the power supply type of the current power supply according to the voltage frequency.
Preferably, the heating circuit further comprises an alternating voltage detection circuit and a direct voltage detection circuit, and the alternating voltage detection circuit and the direct voltage detection circuit are both connected with the microcontroller; wherein
The microcontroller is further used for determining that the current power supply is a direct-current power supply or an alternating-current power supply according to the power supply type;
the microcontroller is also used for acquiring a first working voltage of the current power supply through the alternating voltage detection circuit when the current power supply is an alternating current power supply; when the current power supply is a direct-current power supply, acquiring a second working voltage of the current power supply through the direct-current voltage detection circuit;
the microcontroller is further used for judging whether the first working voltage or the second working voltage is greater than a preset protection voltage threshold value; when the first working voltage or the second working voltage is larger than a preset protection voltage threshold value, controlling the heating loop to stop heating; and when the first working voltage or the second working voltage is less than or equal to a preset protection voltage threshold value, controlling the heating loop to normally heat.
Preferably, the microcontroller is further configured to set the heating power of the heating circuit according to the first working voltage or the second working voltage when the first working voltage or the second working voltage is smaller than a preset protection voltage threshold.
Preferably, the heating circuit comprises a first heating circuit and a second heating circuit, the first heating circuit comprises a first switch and a first heat source; the second heating loop comprises a second switch and a second heat source; wherein
The controlled end of the first switch is connected with the microcontroller, the first end of the first switch is connected with a live wire of the mains supply, the second end of the first switch is connected with the first end of the first heat source, and the second end of the first heat source is connected with a zero line of the mains supply;
the controlled end of the second switch is connected with the microcontroller, the first end of the second switch is connected with the positive electrode of direct current, the second end of the second switch is connected with the first end of the second heat source, and the second end of the second heat source is connected with the negative electrode of the direct current.
Preferably, the alternating voltage detection circuit includes a first current limiting circuit, a first diode, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, and a second diode; wherein
The first end of the first current limiting circuit is connected with a current power supply, the second end of the first current limiting circuit is connected with the anode of the first diode, and the cathode of the first diode is connected with the first end of the fourth resistor; the second end of the fourth resistor is connected with the microcontroller through the fifth resistor; the first end of the sixth resistor is connected with the second end of the fourth resistor, and the second end of the sixth resistor is grounded; the first end of the first capacitor is connected with the first end of the sixth resistor, and the second end of the first capacitor is grounded; and the anode of the second diode is connected with the second end of the fourth resistor, and the cathode of the second diode is connected with the first direct current source.
Preferably, the dc voltage detection circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor, a third diode, and a fourth diode; wherein
The anode of the third diode is connected with the current power supply, the cathode of the third diode is connected with the first end of the seventh resistor, the second end of the seventh resistor is connected with the first end of the eighth resistor, and the second end of the eighth resistor is connected with the microcontroller; a first end of the ninth resistor is connected with a second end of the seventh resistor, and a second end of the ninth resistor is grounded; a first end of the second capacitor is connected with a second end of the seventh resistor, and a second end of the second capacitor is grounded; and the anode of the fourth diode is connected with the second end of the seventh resistor, and the cathode of the fourth diode is connected with the first direct current source.
Preferably, the power detection circuit includes a second current limiting circuit, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a first triode, a third capacitor, a fourth capacitor, a fifth diode and a sixth diode; wherein
The first end of the second current limiting circuit is connected with the current power supply, and the second end of the second current limiting circuit is connected with the base electrode of the first triode; the anode of the fifth diode is connected with the base of the first triode, the cathode of the fifth diode is connected with a second direct current source, and the thirteenth resistor is connected between the cathode and the anode of the fifth diode in parallel; an emitter of the first triode is connected with a second direct current source, a collector of the first triode is connected with a first end of the fourteenth resistor, and a second end of the fourteenth resistor is grounded through the fifteenth resistor; the first end of the third capacitor is connected with the base electrode of the first triode, and the second end of the third capacitor is grounded; the first end of the fourth capacitor is connected with the base electrode of the first triode, and the second end of the fourth capacitor is grounded; an anode of the sixth diode is connected with the second end of the fourteenth resistor, and a cathode of the sixth diode is connected with the first direct current source; a first end of the sixteenth resistor is connected to a second end of the fourteenth resistor, and a second end of the sixteenth resistor is connected to the microcontroller.
In order to achieve the above purpose, the present invention further provides a heating cup body, which includes the heating circuit as described above.
In order to achieve the above object, the present invention further provides a vehicle-mounted heater, which includes a switching power supply, a first connector, a second connector, and a control circuit, wherein the control circuit includes the power supply detection circuit and the microcontroller; the power supply detection circuit is connected with the microcontroller; the first connector and the second connector are coupled with each other; the switching power supply, the first connector, the second connector and the heating circuit are connected in sequence.
Preferably, the vehicle-mounted heater further comprises a base and a cup body; the switching power supply and the first connector are arranged on the base; the second connector and the heating circuit are arranged on the cup body, and the cup body is arranged on the base.
According to the technical scheme, the heating circuit is formed by arranging the power supply detection circuit, the microcontroller and the plurality of heating loops. And the microcontroller judges the type of the current power supply according to the power supply parameters, determines a corresponding target heating loop according to the power supply type, and connects the current power supply with the target heating loop so as to heat a target area through the target heating loop. According to the technical scheme, according to the current power type, such as commercial power, direct current and the like, when the current power is the commercial power, the heating circuit corresponding to the commercial power is adopted for heating, and when the current power is the direct current, the heating circuit corresponding to the direct current is adopted for heating, so that the heating circuit can be compatible with different power types, and the heater is prevented from being damaged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of a heating circuit according to an embodiment of the present invention;
FIG. 2 is a functional block diagram of another embodiment of a heating circuit of the present invention;
FIG. 3 is a schematic structural diagram of a heating circuit according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another embodiment of a heating circuit according to the present invention;
fig. 5 is a schematic structural diagram of an embodiment of the vehicle-mounted heater of the invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
311 | |
| 20 | |
312 | |
| 30 | |
320 | |
| 40 | |
321 | The |
| 100 | Power |
322 | |
| 200 | Micro-controller | R1～R16 | First to |
| 300 | Heating circuit | C1～C4 | A fourth capacitor with a |
| 400 | Alternating voltage detection circuit | D1～D6 | First to |
| 500 | DC voltage detection circuit | Q1 | A |
| 310 | |
110 | Second current limiting |
| 410 | First current limiting circuit |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
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.
It should be noted that all directional indicators (such as up, down, left, right, front, and back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicators are changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should be considered to be absent and not within the protection scope of the present invention.
The invention provides a heating circuit.
Referring to fig. 1, the heating circuit according to the present invention includes a power detection circuit 100, a microcontroller 200, and a plurality of heating circuits 300, i.e., a heating circuit 1 to a heating circuit N. N in the heating loop N is a positive integer, and N is greater than 1, for example: n is a positive integer such as 2, 3, 4, 5, 6, 7 or 8, which is not limited in this embodiment.
The power detection circuit 100 and the heating circuit 300 are both connected to the microcontroller 200. The power detection circuit 100 is configured to acquire power parameters of a current power. It should be noted that, in this embodiment, the power parameter refers to a parameter capable of reflecting a power type, and the power type generally includes domestic commercial power, foreign commercial power, and direct current. The power supply parameters include frequency, phase, amplitude, etc.
In the present embodiment, a heating pipe is used as a heat source in the heating circuit 300. The heating circuit is applied to a heater, and a vehicle-mounted heater generally comprises a base and a cup body. The cup body is internally provided with articles to be heated, such as food, beverage and the like, so that a user can conveniently heat the food at any time and any place.
The microcontroller 200 is configured to determine a power type of a current power supply according to the power parameter, determine a corresponding target heating loop according to the power type, and connect the current power supply and the target heating loop to heat a target area through the target heating loop 300. It is understood that the microcontroller 200 may be implemented by a single chip, a Digital Signal Processing (DSP) chip, or the like.
In this embodiment, when the power type is domestic commercial power or foreign commercial power, the microcontroller 200 turns on the corresponding heating circuit 300, and the heating circuit 300 can heat the heating pipe by using ac power. Accordingly, when the power type is dc, the microcontroller turns on the corresponding heating circuit 300, and the heating circuit 300 can heat the heating tube by using dc. Different heating circuits 300 are turned on corresponding to different heating modes.
According to the technical scheme of the invention, the power supply detection circuit 100, the microcontroller 200 and the plurality of heating loops 300 are arranged to form a heating circuit. The microcontroller 200 judges the type of the current power supply according to the power supply parameters, determines a corresponding target heating loop according to the power supply type, and connects the current power supply with the target heating loop so as to heat a target area through the target heating loop. According to the technical scheme, when the current power supply is the commercial power supply, the heating circuit corresponding to the commercial power supply is adopted for heating according to the current power supply type, such as the commercial power supply, the direct current power supply and the like, and when the current power supply is the direct current power supply, the heating circuit corresponding to the direct current power supply is adopted for heating, so that the heating circuit can be compatible with different power supply types, and the heater is prevented from being damaged.
Referring to fig. 2, further, the heating circuit further includes an ac voltage detection circuit 400 and a dc voltage detection circuit 500, and both the ac voltage detection circuit 400 and the dc voltage detection circuit 500 are connected to the microcontroller 200; wherein
The microcontroller is also used for determining that the current power supply is a direct-current power supply or an alternating-current power supply according to the power supply type;
the microcontroller 200 is further configured to acquire a first working voltage of the current power supply through the alternating voltage detection circuit 400 when the current power supply is an alternating current power supply; when the current power supply is a direct current power supply, collecting a second working voltage of the current power supply through the direct current voltage detection circuit 500;
the microcontroller 200 is further configured to determine whether the first working voltage or the second working voltage is greater than a preset protection voltage threshold; when the first working voltage or the second working voltage is larger than a preset protection voltage threshold value, controlling the heating loop to stop heating; when the first working voltage or the second working voltage is less than or equal to a preset protection voltage threshold value, controlling the heating loop to normally heat
It should be noted that, due to the fluctuation of the mains voltage and the complexity of the working condition of the vehicle-mounted power supply of the automobile, the alternating current or direct current input to the heating device is easy to generate an overvoltage condition. In order to avoid the heating circuit from being burned out due to overvoltage, an ac voltage detection circuit 400 and a dc voltage detection circuit 500 are further disposed in this embodiment. When the first working voltage is sampled, a plurality of first working voltages can be continuously sampled at certain intervals, and then the average value is obtained, so that the sampling precision and reliability are improved. Similarly, when the second operating voltage is sampled, a plurality of second operating voltages may be continuously sampled, and an average value may be obtained and used as a final voltage sample.
The following description is given by way of example with two heating circuits, without limiting the scope of the invention. Referring to fig. 3, in particular, the ac voltage detecting circuit 400 includes a first current limiting circuit 410, a first diode D1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, and a second diode D2. Wherein, L line represents live wire, and N line represents zero line. A first end of the first current limiting circuit 410 is connected to a current power supply, a second end of the first current limiting circuit 410 is connected to an anode of the first diode D1, and a cathode of the first diode D1 is connected to a first end of the fourth resistor R4; a second end of the fourth resistor R4 is connected to the microcontroller 200 via the fifth resistor R5; a first end of the sixth resistor R6 is connected to a second end of the fourth resistor R4, and a second end of the sixth resistor R6 is grounded; a first end of the first capacitor C1 is connected with a first end of the sixth resistor R6, and a second end of the first capacitor C1 is grounded; the anode of the second diode D2 is connected to the second end of the fourth resistor R4, and the cathode of the second diode D2 is connected to the first dc source.
The first current limiting circuit 410 is used to increase the voltage resistance level of the subsequent circuit and limit the current input to the subsequent circuit. The first current limiting circuit 410 is configured to limit current by providing resistive elements, such as resistors, where the number of the resistors can be flexibly set according to actual needs, and is not limited again. In this embodiment, the first current limiting circuit 410 includes a first resistor R1, a second resistor R2 and a third resistor R3. A first end of the first resistor R1 is connected to a current power supply, and a second end of the first resistor R1 is connected to a first end of the third resistor R3 via the second resistor R2; a second terminal of the third resistor R3 is connected to an anode of the first diode D1.
It should be noted that the first resistor R1, the second resistor R2, the third resistor R3, and the sixth resistor R6 form a voltage divider circuit. The first diode D1 is used to rectify and isolate the alternating current. The sixth resistor R6 and the first capacitor C1 form an RC filter circuit, which is used for performing voltage stabilization and filtering on the input voltage, meanwhile, the sixth resistor R6 is also used for voltage division, and the microcontroller 200 obtains the voltage at the two ends of the sixth resistor R6 as the first working voltage. The second diode D2 is used to prevent the voltage difference across the second diode D2 from being too large, which may cause the voltage input at the pin of the microcontroller 200 to be too large and damage the microcontroller 200.
Specifically, the dc voltage detection circuit 500 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second capacitor C2, a third diode D3, and a fourth diode D4; wherein
The anode of the third diode D3 is connected to the current power supply, the cathode of the third diode D3 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is connected to the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is connected to the microcontroller 200; a first end of the ninth resistor R9 is connected to a second end of the seventh resistor R7, and a second end of the ninth resistor R9 is grounded; a first end of the second capacitor C2 is connected to a second end of the seventh resistor R7, and a second end of the second capacitor C2 is grounded; an anode of the fourth diode D4 is connected to the second end of the seventh resistor R7, and a cathode of the fourth diode D4 is connected to the first dc source.
It should be noted that the third diode D3 is used for isolation, the seventh resistor R7 and the eighth resistor R8 are used for voltage division, and the microcontroller 200 obtains a voltage across the eighth resistor R8 as a second operating voltage. Similarly, the fourth diode D4 is used to prevent the voltage difference across the fourth diode D4 from being too large, which may cause the voltage at the pin input of the microcontroller 200 to be too large and damage the microcontroller 200.
Specifically, the power detection circuit 100 is configured to count zero-crossing times of a current power access voltage in a unit time, and the microcontroller 200 determines a frequency of the current power access voltage according to the zero-crossing times to identify that the voltage of the current power is domestic utility power, foreign utility power, or direct current.
Specifically, the power detection circuit 100 includes a second current limiting circuit 110, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a first transistor Q1, a third capacitor C3, a fourth capacitor C4, a fifth diode D5, and a sixth diode D6; wherein
A first end of the second current limiting circuit 110 is connected to a current power supply, and a second end of the second current limiting circuit 110 is connected to a base of the first triode Q1; an anode of the fifth diode D5 is connected to the base of the first triode Q1, a cathode of the fifth diode D5 is connected to a second direct current source, and the thirteenth resistor R13 is connected in parallel between the cathode and the anode of the fifth diode D5; an emitter of the first triode Q1 is connected to a second direct current source, a collector of the first triode Q1 is connected to a first end of the fourteenth resistor, and a second end of the fourteenth resistor R14 is grounded via the fifteenth resistor R15; a first end of the third capacitor C3 is connected with the base of the first triode Q1, and a second end of the third capacitor C3 is grounded; a first end of the fourth capacitor C4 is connected with the base of the first triode Q1, and a second end of the fourth capacitor C4 is grounded; an anode of the sixth diode D6 is connected to the second end of the fourteenth resistor R14, and a cathode of the sixth diode D6 is connected to the first direct current source; a first end of the sixteenth resistor R16 is connected to a second end of the fourteenth resistor R14, and a second end of the sixteenth resistor R16 is connected to the microcontroller 200.
The second current limiting circuit 110 is used to increase the withstand voltage level of the subsequent circuit and limit the magnitude of the current input to the subsequent circuit. The second current limiting circuit 110 is configured to limit current by providing resistive elements, such as resistors, where the number of the resistors can be flexibly set according to actual requirements, and is not limited again. In this embodiment, the second current limiting circuit 110 includes a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. A first end of the tenth resistor R10 is connected to a current power supply, a second end of the tenth resistor R10 is connected to a first end of the twelfth resistor R12 through the eleventh resistor R11, and a second end of the twelfth resistor R12 is connected to a base of the first triode Q1.
It should be noted that, in this embodiment, the type of the first triode Q1 is a PNP type, and when the base voltage of the first triode Q1 is smaller than a certain voltage value, the first triode Q1 is turned on. Therefore, in a time region near the zero crossing point of the alternating voltage, the first triode Q1 is turned on, at this time, the voltage at the two ends of the fifteenth resistor R15 is turned from a low level to a high level, and the microcontroller 200 can obtain the voltage frequency by counting the number of times of turning the level in unit time.
The tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the fourteenth resistor R14, and the fifteenth resistor R15 constitute a voltage divider circuit. The fifth diode D5 and the sixth diode D6 both prevent the voltage difference from being too large, and thus protect the same.
Further, the heating circuit includes a first heating circuit 310 and a second heating circuit 320, the first heating circuit 310 includes a first switch 311 and a first heat source 312; the second heating circuit 320 includes a second switch 321 and a second heat source 322.
Referring to fig. 4, in the present embodiment, the first heat source 312 and the second heat source 322 are the same heat source and are implemented by using heating pipes.
The controlled end of the first switch 311 is connected to the microcontroller 200, the first end of the first switch 311 is connected to the live line of the commercial power, the second end of the first switch 311 is connected to the first end of the first heat source 312, and the second end of the first heat source 312 is connected to the neutral line of the commercial power;
the controlled end of the second switch 321 is connected to the microcontroller, the first end of the second switch 321 is connected to the positive electrode of the direct current, the second end of the second switch 321 is connected to the first end of the second heat source 322, and the second end of the second heat source 322 is collinear with the neutral line of the mains supply.
It should be noted that, when the microcontroller 200 detects that the current power supply is ac, the ac power supply is controlled to be connected to the first heating circuit through the first switch 311; when the microcontroller 200 detects that the current power supply is dc power, the second switch 321 controls the dc power to be connected to the second heating loop.
To sum up, in one embodiment, the operation flow of the heating circuit is as follows:
when an external power supply is connected to the heating circuit, the microcontroller 200 counts the zero-crossing frequency of the current power supply connection voltage in unit time through the zero-crossing detection circuit, and the microcontroller 200 determines the frequency of the current power supply connection voltage according to the zero-crossing frequency so as to identify that the voltage of the current power supply is domestic commercial power, foreign commercial power or direct current.
When the current voltage is detected to be domestic commercial power or foreign commercial power, judging whether the current detected voltage is greater than a preset protection voltage threshold value; if yes, the first heating loop 310 is controlled to stop heating; if not, the first heating loop 310 is controlled to heat normally, and the heating power of the first heating loop 310 is set according to the current detection voltage.
When the current voltage is detected to be direct current, judging whether the current detected voltage is larger than a preset protection voltage threshold value; if yes, controlling the second heating circuit 320 to stop heating; if not, the second heating loop 320 is controlled to heat normally, and the heating power of the second heating loop 320 is set according to the current detection voltage.
The technical scheme of the invention at least has the following beneficial effects: the frequency of the current input voltage is judged by counting the zero-crossing times of the input voltage, so that whether the input voltage is vehicle-mounted direct current or commercial power is determined. The vehicle-mounted direct current electric heater is compatible with commercial power and vehicle-mounted direct current, and heating with different powers on a vehicle or under the commercial power is realized by using double heat sources or a single heat source.
Referring to fig. 5, the present invention further provides a vehicle heater, which includes a switching power supply 10, a first connector 20, a second connector 30 and a control circuit 40, wherein the control circuit 40 includes the power supply detection circuit 100 and the microcontroller 200; the power detection circuit 100 is connected with the microcontroller 200; the first connector 20 and the second connector 30 are coupled to each other; the switching power supply 10, the first connector 20, the second connector 30, and the heating circuit 40 are connected in sequence. The specific structure of the heating circuit refers to the above embodiments, and since the vehicle-mounted heater adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
Further, the vehicle-mounted heater also comprises a base and a cup body; the switching power supply 10 and the first connector 10 are disposed on the base; the second connector 30 and the heating circuit 40 are arranged on the cup body, and the cup body is arranged on the base. The switch power supply 10, the safety capacitor and other large components are externally arranged on the base, so that the volume of the heater is miniaturized. In this embodiment, the control circuit 40 in the heating circuit is powered by a 12V dc power supply.
The base is also provided with a grounding wire E to prevent the electric shock caused by the electric leakage of the base. The vehicle-mounted heater further comprises a heating pipe 50, and the heating pipe 50 can be heated by commercial power or direct current.
In order to achieve the above object, the present invention further provides a heating cup body, which includes the heating circuit as described above. The heating cup body is matched with the base for use.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A heating circuit is characterized by comprising a power supply detection circuit, a microcontroller and a plurality of heating loops; the power supply detection circuit and the heating loop are connected with the microcontroller, wherein
The power supply detection circuit is used for acquiring power supply parameters of the current power supply;
the microcontroller is used for judging the power type of the current power supply according to the power supply parameters, and the power type comprises: determining a corresponding target heating loop according to the type of the power supply, and connecting the current power supply with the target heating loop so as to heat a target area through the target heating loop;
the heating circuit comprises a first heating loop and a second heating loop, and the first heating loop comprises a first switch and a first heat source; the second heating loop comprises a second switch and a second heat source; wherein
The controlled end of the first switch is connected with the microcontroller, the first end of the first switch is connected with a live wire of mains supply, the second end of the first switch is connected with the first end of the first heat source, and the second end of the first heat source is connected with a zero line of mains supply;
the controlled end of the second switch is connected with the microcontroller, the first end of the second switch is connected with the positive electrode of direct current, the second end of the second switch is connected with the first end of the second heat source, and the second end of the second heat source is connected with the negative electrode of the direct current.
2. The heating circuit of claim 1, wherein the power supply detection circuit is further configured to count a number of zero crossings of a voltage of a current power supply per unit time, and use the number of zero crossings of the voltage as a power supply parameter;
the microcontroller is further used for determining the voltage frequency of the current power supply according to the voltage zero-crossing times and determining the power type of the current power supply according to the voltage frequency.
3. The heating circuit of claim 1, further comprising an ac voltage detection circuit and a dc voltage detection circuit, both connected to the microcontroller; wherein
The microcontroller is also used for determining that the current power supply is a direct-current power supply or an alternating-current power supply according to the power supply type;
the microcontroller is also used for acquiring a first working voltage of the current power supply through the alternating voltage detection circuit when the current power supply is an alternating current power supply; when the current power supply is a direct-current power supply, acquiring a second working voltage of the current power supply through the direct-current voltage detection circuit;
the microcontroller is also used for judging whether the first working voltage or the second working voltage is greater than a preset protection voltage threshold value; when the first working voltage or the second working voltage is larger than a preset protection voltage threshold value, controlling the heating loop to stop heating; and when the first working voltage or the second working voltage is less than or equal to a preset protection voltage threshold value, controlling the heating loop to normally heat.
4. The heating circuit of claim 3, wherein the AC voltage detection circuit comprises a first current limiting circuit, a first diode, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, and a second diode; wherein
The first end of the first current limiting circuit is connected with a current power supply, the second end of the first current limiting circuit is connected with the anode of the first diode, and the cathode of the first diode is connected with the first end of the fourth resistor; the second end of the fourth resistor is connected with the microcontroller through the fifth resistor; a first end of the sixth resistor is connected with a second end of the fourth resistor, and a second end of the sixth resistor is grounded; the first end of the first capacitor is connected with the first end of the sixth resistor, and the second end of the first capacitor is grounded; and the anode of the second diode is connected with the second end of the fourth resistor, and the cathode of the second diode is connected with the first direct current source.
5. The heating circuit of claim 3, wherein the DC voltage detection circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor, a third diode, and a fourth diode; wherein
The anode of the third diode is connected with a current power supply, the cathode of the third diode is connected with the first end of the seventh resistor, the second end of the seventh resistor is connected with the first end of the eighth resistor, and the second end of the eighth resistor is connected with the microcontroller; a first end of the ninth resistor is connected with a second end of the seventh resistor, and a second end of the ninth resistor is grounded; the first end of the second capacitor is connected with the second end of the seventh resistor, and the second end of the second capacitor is grounded; and the anode of the fourth diode is connected with the second end of the seventh resistor, and the cathode of the fourth diode is connected with the first direct current source.
6. The heating circuit of claim 1, wherein the power detection circuit comprises a second current limiting circuit, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a first transistor, a third capacitor, a fourth capacitor, a fifth diode, and a sixth diode; wherein
The first end of the second current limiting circuit is connected with the current power supply, and the second end of the second current limiting circuit is connected with the base electrode of the first triode; the anode of the fifth diode is connected with the base of the first triode, the cathode of the fifth diode is connected with a second direct current source, and the thirteenth resistor is connected between the cathode and the anode of the fifth diode in parallel; an emitter of the first triode is connected with a second direct current source, a collector of the first triode is connected with a first end of the fourteenth resistor, and a second end of the fourteenth resistor is grounded through the fifteenth resistor; the first end of the third capacitor is connected with the base electrode of the first triode, and the second end of the third capacitor is grounded; the first end of the fourth capacitor is connected with the base electrode of the first triode, and the second end of the fourth capacitor is grounded; an anode of the sixth diode is connected with the second end of the fourteenth resistor, and a cathode of the sixth diode is connected with a first direct current source; a first end of the sixteenth resistor is connected to a second end of the fourteenth resistor, and a second end of the sixteenth resistor is connected to the microcontroller.
7. A heating cup body, characterized in that the heating cup body comprises the heating circuit as claimed in any one of claims 1 to 6.
8. A vehicle heater, comprising a switch power supply, a first connector, a second connector and a control circuit, wherein the control circuit comprises the heating circuit as claimed in any one of claims 1 to 6; the first connector and the second connector are coupled with each other; the switching power supply, the first connector, the second connector and the heating circuit are connected in sequence.
9. The vehicle heater of claim 8, further comprising a base and a cup; the switching power supply and the first connector are arranged on the base; the second connector and the heating circuit are arranged on the cup body, and the cup body is arranged on the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910715263.3A CN112312592B (en) | 2019-08-01 | 2019-08-01 | Heating circuit, heating cup and vehicle-mounted heater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910715263.3A CN112312592B (en) | 2019-08-01 | 2019-08-01 | Heating circuit, heating cup and vehicle-mounted heater |
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| CN112312592A CN112312592A (en) | 2021-02-02 |
| CN112312592B true CN112312592B (en) | 2023-01-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002324652A (en) * | 2001-04-26 | 2002-11-08 | Canon Inc | Heating device and image forming device |
| KR100686026B1 (en) * | 2005-11-22 | 2007-02-22 | 엘지전자 주식회사 | Security circuit for limiting current in electric application |
| CN104676672B (en) * | 2014-06-25 | 2016-07-06 | 广东美的厨房电器制造有限公司 | Vehicle-carried microwave stove |
| CN204070568U (en) * | 2014-08-14 | 2015-01-07 | 深圳市合元科技有限公司 | The electronic cigarette of dual power supply |
| CN109302758B (en) * | 2017-07-25 | 2021-03-19 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and control circuit and method thereof |
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