CN110881225B - Electric heater and control method thereof - Google Patents
Electric heater and control method thereof Download PDFInfo
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- CN110881225B CN110881225B CN201811031905.XA CN201811031905A CN110881225B CN 110881225 B CN110881225 B CN 110881225B CN 201811031905 A CN201811031905 A CN 201811031905A CN 110881225 B CN110881225 B CN 110881225B
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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
An electric heater comprising a processor, a first main switch, at least two sub-switches: first branch switch and second branch switch, at least two heating unit: the electric heater comprises a first heating unit, a second heating unit, a processor, a first main switch, a first branch switch and a second branch switch, wherein the processor is electrically connected with the first main switch, the first branch switch and the second branch switch, the processor can control the first main switch, the first branch switch and the second branch switch to be conducted or not conducted, the electric heater further comprises a collecting unit, and the processor can obtain signal information through the collecting unit.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of vehicles.
[ background of the invention ]
The electric heater can be used in the technical field of vehicles and the like for heating or warming, the switch tube is a component of the electric heater, and the control problem of the switch tube can be involved in the use process of the electric heater.
[ summary of the invention ]
The technical scheme aims to provide an electric heater and a control method thereof.
In order to realize the purpose, the following technical scheme is adopted:
an electric heater comprising a processor, a first main switch, at least two sub-switches: first branch switch and second branch switch, at least two heating unit: the electric heater comprises a first heating unit, a second heating unit, a processor, a first main switch, a first branch switch, a second branch switch and a collecting unit, wherein the processor can control the conduction and the non-conduction of the first main switch, the first branch switch and the second branch switch;
the processor acquires first signal information through the acquisition unit, after the electric heater is powered on, the processor controls the first main switch to be conducted, the first branch switch to be not conducted and the second branch switch to be not conducted, and the processor acquires second signal information; the processor judges whether the value compared with the first signal information is smaller than a first set value or not, if the processor judges that the value compared with the first signal information is smaller than or equal to the first set value, the processor judges that the electric heater is normal, and the electric heater enters a normal working state; and if the processor judges that the value compared with the first signal information is larger than the first set value, the processor controls the first main switch to be not conducted.
The technical scheme also provides a control method of the electric heater, which comprises a processor, a first main switch and a branch switch part, wherein the processor is electrically connected with the first main switch, the processor is electrically connected with the branch switch part, the first main switch is electrically connected with the branch switch part, and the control method of the electric heater comprises the following steps:
the processor acquires first signal information; the electric heater is powered on; the processor controls the first main switch to be switched on and the branch switch to be switched off; the processor acquires second signal information; the processor judges whether the value of the comparison between the second signal information and the first signal information is less than or equal to a first set value; if the current value is less than or equal to the preset value, the processor judges that the electric heater is normal and the electric heater enters a normal working state; and if the voltage is larger than the preset voltage, the processor controls the first main switch to be switched off.
In the technical scheme, the processor detects whether the electric heater is normal or abnormal according to the first signal information before power-on and the second signal information after power-on, and when the processor detects that the electric heater is abnormal, the processor controls the first switch to be not conducted, so that the problem that the electric heater is unsafe to use due to the abnormality is avoided.
[ description of the drawings ]
FIG. 1 is a schematic view of a connection of an electric heater;
FIG. 2 is a schematic connection diagram of another embodiment of an electric heater;
FIG. 3 is a schematic connection diagram of a third embodiment of an electric heater;
FIG. 4 is a schematic connection diagram of a third embodiment of an electric heater;
FIG. 5 is a schematic flow chart of a method of controlling an electric heater;
FIG. 6 is a schematic flow chart diagram of a second embodiment of a method of controlling an electric heater;
FIG. 7 is a schematic flow chart diagram of a third embodiment of a method of controlling an electric heater;
FIG. 8 is a flow diagram of one embodiment of an electric heater control method.
[ detailed description ] embodiments
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1 to 4, the electric heater 1 includes a processor 14, a first main switch 11, and at least two sub-switches: a first and a second partial switch 121, 122, at least two heating units: the electric heater comprises a first heating unit 131 and a second heating unit 132, wherein the processor 14 is electrically connected with the first main switch 11, the first branch switch 121 and the second branch switch 122, the processor 14 can control the conduction and the non-conduction of the first main switch 11, the first branch switch 121 and the second branch switch 122, the first main switch 11 is connected with the first branch switch 121 in series, the first main switch 11 is connected with the second branch switch 122 in series, the first branch switch 121 is connected with the first heating unit 131 in series, the second branch switch 122 is connected with the second heating unit 132 in series, the electric heater further comprises a collecting unit 16, and the processor 14 can obtain signal information through the collecting unit 16; the processor 14 acquires first signal information through the acquisition unit 16, after the electric heater 1 is powered on, the processor 16 controls the first main switch 11 to be switched on, the first sub switch 121 to be switched off, the second sub switch 122 to be switched off, and the processor 14 acquires second signal information; the processor 14 judges whether the value of the comparison between the second signal information and the first signal information is smaller than a first set value, if the processor 14 judges that the value of the comparison between the second signal information and the first signal information is smaller than or equal to the first set value, the processor 14 judges that the electric heater 1 is normal, and the electric heater enters a normal working state; if the processor 14 determines that the value of the comparison between the second signal information and the first signal information is greater than the first set value, the processor 14 controls the first main switch to be turned off. The first set value is a preset value of the electric heater, and the set value is related to a parameter of the electric heater, for example, the first set value is in a functional relationship with a rated voltage of the electric heater, or the first set value is in a functional relationship with a rated current of the electric heater, or the first set value is in a functional relationship with a rated voltage and a rated current of the electric heater, of course, the first set value may be a specific value, or may be a plurality of specific values, for example, the first set value is 0.05V0, where V0 represents a rated voltage of the electric heater, or for example, the first set value includes two values of 0.05V0 and 0.05a0, where V0 and a0 are a rated voltage and a rated current of the electric heater, respectively. The first signal information acquired by the processor 14 may be the first signal information of the electric heater 1 acquired before the electric heater 1 is powered on, or may be, for example, the electric heater 1 is used in a vehicle, and the processor 14 acquires the first signal information of the electric heater 1 before the electric heater 1 is powered on and after the vehicle is powered on, where the first signal information includes at least one of current information, voltage information, and a/D information. After the electric heater 1 is powered on, the processor 14 acquires second signal information of the electric heater 1, and the processor judges whether a value obtained by comparing the second signal information with the first signal information is smaller than a first set value, when the processor 14 detects that the electric heater 1 is abnormal/abnormal, at least one of the branch switches is abnormally conducted, or the processor 14 cannot control at least one of the branch switches to conduct or not conduct, or at least one of the branch switches is conducted when the at least one of the branch switches should not conduct, or at least one of the branch switches may be in a normally-on state, or at least one of the branch switches is abnormal/abnormal; after the processor 14 determines that the electric heater is abnormal/abnormal, the processor 14 controls the first main switch 10 to be non-conductive, and when the first main switch 10 is non-conductive, the heating unit cannot heat whether the sub-switch is conductive or non-conductive. When the branch switch is abnormal/abnormal, the heating unit is abnormal/abnormally heated, the phenomena that the heating unit continuously works, such as dry burning (no working medium) of the electric heater 1, continuous uninterrupted work of the heating unit and the like can occur, and when the dry burning occurs, the safety problems of electric conduction, electric leakage or fire easily occur due to overhigh temperature of the electric heater; when the heating unit continuously and uninterruptedly works, the service life of the heating unit is relatively reduced, and further the service life of the electric heater 1 is reduced. In summary, after the processor 14 determines that the electric heater is abnormal/abnormal, the processor 14 controls the first main switch 10 to be non-conductive, which is beneficial to improving the safety of the electric heater 1 during the use process and avoiding unsafe phenomena caused by the above abnormal conditions.
Referring to fig. 1, in the embodiment shown in fig. 1, taking the example that the sub-switch portion 120 includes the first sub-switch 121, the second sub-switch 122 and the third sub-switch 123, and the heating portion 130 includes the first heating unit 131, the second heating unit 132 and the third heating unit 133, wherein the first main switch 11 is connected in series with the first sub-switch 121, the second sub-switch 122 and the third sub-switch 123, the first sub-switch 121 is connected in series with the first heating unit 131, the second sub-switch 122 is connected in series with the second heating unit 132, the third sub-switch 123 is connected in series with the third heating unit 133, the first main switch 11, the first heating unit 131 and the first sub-switch 121 are connected in sequence (ignoring other components), or it can be said that, when all the first main switch 11, the first heating unit 131 and the first sub-switch 121 have current flowing through, the order of the current passing through the first main switch 11, the first heating unit 131, and the first sub-switch 121 is the first main switch 11, the first heating unit 131, and the first sub-switch 121. The conduction or non-conduction of the first main switch 11 can affect the control of the first heating unit 131 by the first sub-switch 121, the control of the second heating unit 132 by the second sub-switch 122, and the control of the third heating unit 133 by the third sub-switch 123. Specifically, when the first main switch 11 is turned on, the first sub-switch 121 is turned on, the first heating unit 131 operates or heats, the first sub-switch 121 is not turned on, and the first heating unit does not operate or heat, that is, the turning on or off of the first sub-switch 121 controls the operation or non-operation of the first heating unit 131; similarly, when the first main switch 11 is turned on, the second and third sub-switches 122 and 123 are turned on and off to control the operation and non-operation of the second and third heating units 132 and 133. When the first main switch 121 is not conductive, the first, second, and third heating units do not operate/heat whether the first, second, and third switches are conductive or non-conductive. The electric heater 1 includes a processor 14, the processor 14 is electrically connected to the first main switch 11, the first sub-switch 121, and the second sub-switch 122, and the processor 14 can control the conduction and non-conduction of the first main switch 11, the first sub-switch 121, and the second sub-switch 122. The electric heater 1 includes an acquisition unit 16, the acquisition unit 16 may be an acquisition resistor or an acquisition circuit, and the processor 14 is capable of acquiring signal information through the acquisition unit, where the signal information includes at least one of voltage information, current information, and a/D information, for example, the signal information includes the voltage information and the current information, or the signal information includes the current information, the a/D information, and the like. In the embodiment shown in fig. 1, the electrical connection relationship among the first main switch 11, the first sub-switch 121, and the first heating unit 131 is sequential connection (other components are omitted), and as another embodiment, referring to fig. 4, the electrical connection relationship among the first main switch 11 ', the first heating unit 131 ', and the first sub-switch 121 ' is sequential connection (other components are omitted). In the embodiment shown in fig. 4, the driving voltage of the first sub-switch 121' is greater than the driving voltage of the first sub-switch 121 of the embodiment shown in fig. 1, and the embodiment shown in fig. 4 is advantageous for the operating condition requiring a large driving voltage compared to the embodiment shown in fig. 1. The high-voltage power supply is arranged on the vehicle, can supply high voltage to the electric heater 1, and can be power supply voltage of more than 180 volts, for example, the high-voltage power supply can be power supply voltage between 220 volts and 450 volts; the low voltage power supply is provided in the vehicle to provide low voltage electricity to the electric heater 1, and may be a supply voltage of 45 volts or less, for example, between 12 and 32 volts. When the electric heater 1 is powered on, which is referred to herein and hereinafter as the electric heater being powered on with high voltage, the first heating unit 131 heats when the first main switch 11 is turned on and the first sub-switch 121 is turned on; when the first main switch 11 is turned on and the second sub-switch 122 is turned on, the second heating unit 132 heats; when the first main switch 11 is turned on and the third sub-switch 123 is turned on, the third heating unit 133 heats; when the first main switch 11 is not turned on, the first, second and third heating units do not heat whether the first sub-switch, the second sub-switch and the third sub-switch are turned on or off; when the first main switch 11 is turned on, the first sub-switch 121 is not turned on, and the first heating unit 131 does not heat; when the first main switch 11 is turned on, the second sub switch 122 is not turned on, and the second heating unit 132 does not heat; when the first main switch 11 is turned on, the third sub-switch 123 is not turned on, and the third heating unit 133 does not heat. The electric heater 1 comprises a first branch comprising a first tap 121 and a first heating unit 131, a second branch comprising a second tap 122 and a second heating unit 132, and a third branch comprising a third tap 123 and a third heating unit, and the electric heater 1 comprises a main branch comprising a first main switch. The processor 14 can collect the voltage information, the current information and the a/D information in the electric heater circuit through the collecting unit 16, in the embodiment shown in fig. 1, the current value of the main branch should be the sum of the current values of the first branch, the second branch and the third branch, and the processor 14 obtains the current value of the main branch and/or the voltage value and/or the a/D value of the electric heater through the collecting unit 16. In one embodiment, the first main switch 11, the first sub-switch 121, the second sub-switch 122, and the third sub-switch 123 are insulated gate bipolar transistors.
Before the electric heater 1 is powered on, the low-voltage power supply powers on the electric heater, and the processor 14 acquires first signal information through the acquisition unit 16, for example, the acquired first signal information includes a first voltage value V1 of the electric heater and a first main current value a1 of the main branch; the electric heater 1 is powered on, and the processor 14 obtains second signal information, where the obtained second signal information includes a second voltage value V2 of the electric heater after the electric heater 1 is powered on, and a second current value a2 of the main branch. Referring to fig. 5-6, before the processor 14 determines whether the value of the second signal information compared with the first signal information is smaller than or equal to the first set value, the processor 14 determines whether the second signal information is within the preset range, if so, the processor determines that the electric heater 1 is normal, the electric heater enters a normal working state, and if not, the processor 14 determines whether the value of the second signal information compared with the first signal information is smaller than the first set value; or before the processor 14 determines whether the value obtained by comparing the second signal information with the first signal information is less than or equal to the first set value, the processor 14 determines whether the value obtained by comparing the second signal information with the first signal information is within a preset range, if so, the processor determines that the electric heater is normal, and the electric heater enters a normal working state; if not, the processor 14 determines whether the value of the comparison between the second signal information and the first signal information is less than or equal to a first set value. For example, the preset range of the processor 14 includes at least one of V2 ≤ V1+0.5 × V1, V2 ≥ V1-0.5 × V1, and/or at least one of a2 ≤ a1+0.5 × a1, and a2 ≥ a1-0.5 × a1, the processor 14 determines whether the second voltage value V2 and/or the second current value a2 are within the preset range, and if the processor determines that the second voltage value V2 and the second current value a2 are within the preset range, that is, the second signal information is within the preset range, the processor determines that the electric heater 1 is normal; if the processor 14 determines that the second voltage value V2 and the second current value a2 are not within the predetermined range, the processor 14 determines whether the value of the second signal information compared with the first signal information is smaller than the first set value. Or, the processor 14 presets the first range to be 0.5-1.5, and whether the ratio of the second voltage V2 to the first voltage V1 is within the preset range, if so, the processor 14 determines that the electric heater is normal, and if not, the processor 14 determines whether the value of the comparison between the second signal information and the first signal information is smaller than the first set value. In summary, the preset range may be a relationship between the second signal information and the first signal information, or the preset range is a value range. Of course, the comparison of the second signal information with the first signal information should include a difference relationship, a square root relationship, a square difference relationship, etc. therebetween. It should be noted that the first signal information at least includes one of current information, voltage information and a/D information, and the second signal information at least includes one of current information, voltage information and a/D information, and at least one of the first signal information and the second signal information corresponds to at least one of the first signal information, so that the second signal information is comparable to the first signal information.
Referring to fig. 1 to 5, the processor 14 determines whether the value of the second signal information compared with the first signal information is smaller than a first set value, if the processor 14 determines that the value of the second signal information compared with the first signal information is smaller than or equal to the first set value, the processor 14 determines that the electric heater 1 is normal, and the electric heater enters a normal working state; if the processor 14 determines that the value compared between the second signal information and the first signal information is greater than the first set value, the processor 14 controls the first main switch 11 to be turned off. For example, as an embodiment, the electric heater 1 includes a main branch, a first branch and a second branch, the first branch includes the first switch 121 and the first heating unit 131, the second branch includes the second switch 122 and the second heating unit 132, and a current value of the main branch is greater than or equal to a sum of current values of the first branch and the second branch; the processor 14 judges whether the absolute value of the difference between the second signal information and the first signal information is less than or equal to a first set value, if the processor judges that the absolute value of the difference between the second signal information and the first signal information is less than or equal to the first set value, the processor judges that the electric heater is normal and enters a normal working state, if the processor judges that the absolute value of the difference between the second signal information and the first signal information is greater than the first set value, the processor 14 judges that the electric heater 1 is abnormal/abnormal, and the processor 14 controls the first main switch 11 to be switched off; the first signal information comprises a first voltage value of the electric heater, a first main current value of the main branch, a first branch current value of the first branch and a first branch current value of the second branch before the electric heater is powered on; the second signal information comprises a second voltage value of the electric heater after the electric heater is powered on, a second main current value of the main branch, a second branch current value of the first branch and a second branch current value of the second branch, and the difference between the second signal information and the first signal information value comprises one of the difference between the second voltage value and the first voltage value, the difference between the first main current value and the second main current value, the difference between the second branch current value and the first branch current value of the first branch and the difference between the second branch current value and the first branch current value of the second branch. For example, the electric heater 1 presets a first set value, the first set value includes at least one of 0.05 × V0 and 0.05 × a0, wherein the rated voltage of the electric heater 1 is V0, the rated current is a0, if the processor 14 determines that the absolute value of the difference between the second signal information and the first signal information is less than or equal to the first set value, that is, V2-V1, less than or equal to 0.05 × V0 and/or a2-a1, less than or equal to 0.05 × a0, the processor 14 determines that the electric heater is normal, if the processor 14 determines that the absolute value of the difference between the second signal information and the first signal information is greater than the first set value, that is, V2-V1, 0.05V0 and/or a2-a1 > 0.05 \ V0 and/or the absolute value of the difference between the second signal information and the first signal information is greater than or greater than the first set value, that the absolute value of V2-V1, and/or a1 > 0.05 > a0, to avoid a safety problem of the switch being switched on, such as a switch not brought by a safety control, for example, a switch, such as a switch 120, a switch, and so that the safety control is not to avoid a switch is not to be switched on, the power-off setting for the electric heater 1 is made by non-conduction of the first main switch 11, thereby avoiding danger due to abnormal conduction of the sub-switches. Of course, the value of the second signal information compared to the first signal information should include not only the difference value but also a comparison value of the second signal information to the first signal information with a relation of arithmetic square root, geometric square root, arithmetic mean, square difference, and the like. After the electric heater is powered on, the working state of the electric heater is firstly detected, when the abnormal working of the electric heater is detected (for example, the branch switch part 120 cannot be normally conducted to continuously heat), the first main switch is controlled to cut off the power of the heating part 130 in the electric heater, so that the subsequent accidents are avoided, for example, the running state of the electric heater is not detected during power-on, the electric heater continuously heats, the passenger cabin feels uncomfortable, or the electric heater cannot be completely closed, the working state of continuous heating occurs, and the service life of the electric heater is shortened.
As another embodiment, before the electric heater 1 is powered on, the low-voltage power supply powers on the electric heater, and the processor 14 obtains first signal information through the acquisition unit 16, where the first signal information includes a first voltage value V1 of the electric heater and/or a first main current value a1 of the main branch; the electric heater 1 is powered on, and the processor 14 acquires second signal information, wherein the second signal information comprises a second voltage value V2 of the electric heater and/or a second current value V2 of the main branch after the electric heater 1 is powered on; the processor 14 determines whether the absolute value of the difference between the second signal information and the first signal information is less than or equal to a first set value, where the first set value includes 0.05 × V0 and 0.05 × a0, where the rated voltage of the electric heater 1 is V0 and the rated current is a0, if the processor 14 determines that the absolute value of the difference between the second signal information and the first signal information is less than or equal to the first set value, i.e.,/V2-V1 \ is less than or equal to 0.05 × V0 and/or \ a2-a1\ is less than or equal to 0.05 × a0, the processor 14 determines that the electric heater is normal, and if the processor 14 determines that the absolute value of the difference between the second signal information and the first signal information is greater than the first set value, i.e.,/V2-V1 \ 0.05 \ and/or a 1-a 820.05 \ is greater than or greater than the first set value, the processor 14 turns on the first switch 36.
Referring to fig. 2, fig. 2 shows another embodiment of the electric heater, the processor 14 is located at the low voltage power supply side, and the processor 14 is communicatively connected with an isolation unit 17, such as an optical coupler, so as to relatively isolate the strong electric part from the weak part, thereby relatively improving the safety performance of the electric heater.
Referring to fig. 3, fig. 3 shows a third embodiment of the electric heater, in which the collecting unit 16 is respectively disposed in the first branch, the second branch and the third branch, when the processor 14 obtains the signal information, the obtained current signal information includes a first current dividing value of the first branch, a first current dividing value of the second branch and a first current dividing value of the third branch before power-on, and the obtained current signal information further includes a second current dividing value of the first branch, a second current dividing value of the second branch and a second current dividing value of the third branch after power-on of the electric heater. Of course, as another embodiment, the current signal information obtained by the processor 14 may include a first main current value, a second main current value, a first branch current value of the first branch before power-on, a first branch current value of the second branch, a first branch current value of the third branch, a second branch current value of the first branch after power-on, a second branch current value of the second branch, and a second branch current value of the third branch.
Referring to fig. 5, the method for controlling the electric heater includes the following steps:
t0: the processor acquires first signal information;
t1: powering on the electric heater;
t2: the processor controls the first main switch to be switched on, and the sub-switch part is switched off;
t3: the processor acquires second signal information;
t4: the processor judges whether the value of the comparison between the second signal information and the first signal information is less than or equal to a first set value; if the temperature is less than or equal to the normal temperature of the electric heater, the electric heater enters a normal working state; if so, performing T5;
t5: the processor controls the first main switch to be switched off.
Referring to fig. 6 and 7, before the T4 step, a T4 'or T4 "step may be added, wherein T4' and T4" may be substituted for each other;
t4': the processor judges whether the second signal information is in a preset range; if so, the processor judges that the electric heater is normal and the electric heater enters a normal working state; if not, performing the step T4;
t4': the processor judges whether the value of the comparison between the second signal information and the first signal information is within a preset range or not; if so, the processor judges that the electric heater is normal and the electric heater enters a normal working state; if not, the step T4 is carried out.
Referring to fig. 8, in the step T4, taking the processor as an example to determine the absolute value of the difference between the second signal information and the first signal information, the method includes the following steps:
s0: the processor acquires first signal information;
s1: powering on the electric heater;
s2: the processor controls the first main switch to be switched on, and the sub-switch part is switched off;
s3: the processor acquires second signal information;
s4: the processor judges whether the absolute value of the difference between the second signal information and the first signal information is smaller than a first set value; if the temperature is less than or equal to the normal temperature of the electric heater, the electric heater enters a normal working state; if so, performing S5;
s5: the processor controls the first main switch to be switched off.
In the embodiment shown in fig. 8, the first signal information includes at least one of a first voltage value and a first current value of the electric heater before the electric heater is powered on, the second signal information includes at least one of a second voltage value and a second current value of the electric heater after the electric heater is powered on, and the first set value includes at least one of 0.05 × V0 and 0.05a 0.
A vehicle thermal management system comprises a high-voltage power supply, a low-voltage power supply and an electric heater, wherein the high-voltage power supply can supply high voltage to the electric heater, the low-voltage power supply can supply low voltage to the electric heater, and the electric heater is the electric heater.
Claims (11)
1. An electric heater comprising a processor, a first main switch, at least two sub-switches: first branch switch and second branch switch, at least two heating unit: the electric heater comprises a first heating unit, a second heating unit, a processor, a first main switch, a first branch switch, a second branch switch and a collecting unit, wherein the processor can control the conduction and the non-conduction of the first main switch, the first branch switch and the second branch switch;
the processor acquires first signal information through the acquisition unit, after the electric heater is powered on, the processor controls the first main switch to be conducted, the first branch switch to be not conducted and the second branch switch to be not conducted, and the processor acquires second signal information; the processor judges whether the value compared with the first signal information is smaller than a first set value or not, if the processor judges that the value compared with the first signal information is smaller than or equal to the first set value, the processor judges that the electric heater is normal, and the electric heater enters a normal working state; and if the processor judges that the value compared with the first signal information is larger than the first set value, the processor controls the first main switch to be not conducted.
2. The electric heater according to claim 1, wherein the processor determines whether the second signal information is within a predetermined range before the processor determines whether the value of the comparison between the second signal information and the first signal information is smaller than the first set value, if so, the processor determines that the electric heater is normal, the electric heater enters a normal operation state, and if not, the processor determines whether the value of the comparison between the second signal information and the first signal information is smaller than the first set value;
or before the processor judges whether the value of the comparison between the second signal information and the first signal information is smaller than the first set value, the processor judges whether the value of the comparison between the second signal information and the first signal information is within a preset range, if so, the processor judges that the electric heater is normal, and the electric heater enters a normal working state; if not, the processor judges whether the value of the comparison between the second signal information and the first signal information is smaller than the first set value.
3. An electric heater as claimed in claim 1 or 2, wherein the electric heater comprises a main branch, a first branch, a second branch;
the first signal information comprises a first voltage value of the electric heater before the electric heater is powered on, the second signal information comprises a second voltage value of the electric heater after the electric heater is powered on, and the difference between the second signal information and the first signal information comprises the difference between the second voltage value and the first voltage value;
and/or the first signal information comprises a first main current value of the main branch of the electric heater before the electric heater is powered on, the second signal information comprises a second main current value of the main branch of the electric heater after the electric heater is powered on, and the difference between the second signal information and the first signal information value comprises the difference between the first main current value and the second main current value;
and/or the first signal information comprises a first branch current value of the first branch circuit before the electric heater is powered on, the second signal information comprises a second branch current value of the first branch circuit after the electric heater is powered on, and the difference between the second signal information and the first signal information value comprises the difference between the second branch current value and the first branch current value of the first branch circuit;
and/or the first signal information comprises a first branch current value of the second branch circuit before the electric heater is powered on, the second signal information comprises a second branch current value of the second branch circuit after the electric heater is powered on, and the difference between the second signal information and the first signal information value comprises the difference between the second branch current value and the first branch current value of the second branch circuit.
4. The electric heater of claim 3, wherein when the electric heater is operated, the first main switch is turned on, the first sub-switch is turned on, the first heating unit is turned on, the first sub-switch is turned off, and the first heating unit is turned off; the second branch switch is conducted, the second heating element is conducted, the second branch switch is not conducted, and the second heating element is not conducted; when the electric heater works, when the first main switch is not conducted, the first branch switch cannot control the working state of the first heating unit, and the second branch switch cannot control the working state of the second heating unit.
5. The electric heater according to claim 1 or 2, wherein the processor determines whether the absolute value of the difference between the second signal information and the first signal information is equal to or less than the first set value, determines that the electric heater is normal if the processor determines that the absolute value of the difference between the second signal information and the first signal information is equal to or less than the first set value, and controls the first main switch to be turned off if the processor determines that the absolute value of the difference between the second signal information and the first signal information is greater than the first set value;
the electric heater comprises a main branch, a first branch and a second branch, the first branch comprises the first branch switch and the first heating unit, the second branch comprises the second branch switch and the second heating unit, and the current value of the main branch is larger than or equal to the sum of the current values of the first branch and the second branch.
6. A control method of an electric heater including a processor, a first main switch, and a sub-switch section, the processor being electrically connected to the first main switch, the processor being electrically connected to the sub-switch section, the first main switch being electrically connected to the sub-switch section, the control method of the electric heater comprising the steps of:
the processor acquires first signal information; the electric heater is powered on; the processor controls the first main switch to be switched on and the branch switch to be switched off; the processor acquires second signal information; the processor judges whether the value of the comparison between the second signal information and the first signal information is less than or equal to a first set value; if the current value is less than or equal to the preset value, the processor judges that the electric heater is normal and the electric heater enters a normal working state; and if the voltage is larger than the preset voltage, the processor controls the first main switch to be switched off.
7. The method as claimed in claim 6, wherein the processor determines whether the second signal information is within a predetermined range before the processor determines whether the value of the comparison between the second signal information and the first signal information is less than or equal to the first set value, if so, the electric heater is in a normal operation state, and if not, the processor determines whether the value of the comparison between the second signal information and the first signal information is less than or equal to the first set value.
8. The control method of an electric heater according to claim 6, wherein the processor determines whether the value of the comparison of the second signal information with the first signal information is within a preset range before the processor determines whether the value of the comparison of the second signal information with the first signal information is less than or equal to the first set value; if so, the processor judges that the electric heater is normal and the electric heater enters a normal working state; if not, the processor judges whether the value of the comparison between the second signal information and the first signal information is less than or equal to the first set value.
9. The control method of the electric heater according to any one of claims 6 to 8, wherein the processor determines the value of the comparison of the second signal information with the first signal information in such a manner that the processor determines whether or not the absolute value of the difference between the second signal information and the first signal information is smaller than the first set value, the first set value including at least one of a voltage value and a current value.
10. The method of controlling an electric heater according to claim 9, wherein the first set value is at least one of 0.05 times a rated voltage of the electric heater and 0.05 times a rated current of the electric heater.
11. A vehicle thermal management system comprising a high voltage power supply that energizes a high voltage to an electric heater when the electric heater is powered on, and a low voltage power supply that is capable of providing low voltage power to the electric heater, the electric heater being as claimed in any one of claims 1 to 5.
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| CN201811031905.XA CN110881225B (en) | 2018-09-05 | 2018-09-05 | Electric heater and control method thereof |
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| CN201811031905.XA CN110881225B (en) | 2018-09-05 | 2018-09-05 | Electric heater and control method thereof |
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| DE10061458B4 (en) * | 2000-12-09 | 2005-12-15 | Eichenauer Heizelemente Gmbh & Co. Kg | Method and device for controlling a vehicle auxiliary heating |
| KR100894008B1 (en) * | 2007-11-16 | 2009-04-17 | 모딘코리아 유한회사 | Apparatus and method for additional electrical heating device of vehicles |
| JP5875278B2 (en) * | 2011-08-04 | 2016-03-02 | 三菱重工業株式会社 | HEATER CONTROL DEVICE, ITS CONTROL METHOD, AND ITS PROGRAM |
| CN102548060B (en) * | 2011-12-22 | 2013-06-26 | 广东美的电器股份有限公司 | PTC electric heating device and method for controlling same |
| CN206968520U (en) * | 2017-04-28 | 2018-02-06 | 英格索兰（中国）工业设备制造有限公司 | Electrical heating wire control system and refrigerating transport vehicle |
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