Heater and control device thereof

Abstract

The invention discloses a heater and a control device thereof, the heater comprises a heating assembly and a temperature control device, the temperature control device can obtain an electrical parameter of the heating assembly, determine a corresponding temperature parameter according to the electrical parameter, and control the heating assembly when the electrical parameter reaches a preset electrical parameter interval or when the temperature parameter reaches a preset temperature interval. The control circuit controls the circuit of the heating assembly to be cut off. On one hand, whether the temperature is too high or not and whether dry burning exists or not can be judged according to the electrical parameters or the corresponding temperature parameters of the heating assembly, the structure is simpler, cost is reduced, and the problems of installation and maintenance of the temperature sensor are solved; and on the other hand, the whole heating range can be judged, and the overall working state of the heater can be reflected better, so that the detection result is relatively accurate, that is, the heater and the control device thereof can be simplified in structure, and temperature detection can be accurately carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and particularly to a heater and its control device. Background Art

[0002] In new energy vehicles, heaters are used to heat fluid media, and the target areas of the vehicle are heated through the fluid media, such as seat heating, battery preheating, etc. During the heating process of the heater, it is necessary to avoid dry burning problems. The prior art generally uses temperature sensors to detect whether the temperature is too high, but there are some problems. For example, on the one hand, the temperature sensor can only detect the temperature in a small area around it. If a larger area of temperature needs to be detected, multiple temperature sensors need to be set, which increases the cost of the whole vehicle. On the other hand, the setting of multiple temperature sensors not only increases the circuit complexity, but also involves a series of problems such as the layout of these sensors, how to fix them, reliability detection, how to facilitate maintenance and replacement, etc., which causes more problems. Summary of the Invention

[0003] To solve a series of problems brought by the temperature detection of the heater in the prior art, the purpose of the present invention is to provide a heater and its control device with lower cost and convenient and accurate temperature detection.

[0004] To achieve the above invention purpose, an embodiment of the present invention provides a heater, including a heating component and a temperature control device. The temperature control device includes a control circuit and a detection circuit. The control circuit is used to control the on and off of the circuit of the heating component, and the detection circuit is used to obtain the electrical parameters of the heating component, where the electrical parameters include at least one of voltage parameters, current parameters, and resistance parameters;

[0005] When the electrical parameters reach a preset electrical parameter range, the control circuit controls the cutting off of the circuit of the heating component;

[0006] Or,

[0007] The control circuit determines the corresponding temperature parameter according to the electrical parameter. When the temperature parameter reaches a preset temperature range, the control circuit controls the cutting off of the circuit of the heating component.

[0008] As a further improvement of the present invention, the electrical parameters obtained by the detection circuit include voltage parameters and current parameters, and the control circuit determines the resistance parameter according to the ratio of the voltage parameter and the current parameter;

[0009] When the resistance parameter reaches a preset resistance parameter range, the control circuit controls the cutting off of the circuit of the heating component;

[0010] Or,

[0011] The control circuit determines the corresponding temperature parameter according to the resistance parameter. When the temperature parameter reaches the preset temperature range, the control circuit controls the disconnection of the circuit of the heating component.

[0012] As a further improvement of the present invention, the heating component uses a material with a positive temperature coefficient of resistance;

[0013] The preset resistance parameter range includes a minimum resistance threshold. When the resistance parameter is greater than the minimum resistance threshold in the preset resistance parameter range, the control circuit controls the disconnection of the circuit of the heating component;

[0014] Or,

[0015] The preset temperature range includes a minimum temperature threshold. When the temperature parameter is greater than the minimum temperature threshold, the control circuit controls the disconnection of the circuit of the heating component.

[0016] As a further improvement of the present invention, the resistance parameter and the corresponding temperature parameter are determined according to a formula, and the formula is:

[0017] Wherein, R h is the resistance parameter, T h is the temperature parameter, TCR is the temperature coefficient, c is the reference temperature, and R c is the resistance value at the reference temperature;

[0018] Or,

[0019] The resistance parameter and the corresponding temperature parameter are determined according to a temperature-resistance value comparison table.

[0020] As a further improvement of the present invention, the heater includes a heating body, and the heating component includes a substrate, a first insulating layer, a heating layer, and a second insulating layer that are fixedly connected in sequence. The substrate is fixedly connected to the heating body, and the heating layer is insulated and arranged between the first insulating layer and the second insulating layer.

[0021] As a further improvement of the present invention, the heating layer includes a plurality of sub-heating layers. The detection circuit respectively acquires the electrical parameters of each sub-heating layer, and the control circuit respectively controls the on and off of the circuits of each sub-heating layer.

[0022] As a further improvement of the present invention, a pipeline for the fluid medium to flow through is arranged in the heating body, and the heating layer is used to heat the fluid medium;

[0023] The heater includes a liquid inlet and a liquid outlet arranged side by side in a first direction, and the plurality of sub-heating layers are arranged side by side in the first direction.

[0024] As a further improvement of the present invention, the heater further includes at least one thermistor sensor, the detection circuit acquires the thermistor resistance value of each thermistor sensor, the control circuit compares the temperature parameter corresponding to the electrical parameter with the temperature value corresponding to each thermistor resistance value, determines the comparison result, and controls the cut-off of the circuit of the heating component according to the comparison result.

[0025] As a further improvement of the present invention, the control circuit includes a single-chip microcomputer and an insulated gate bipolar transistor, and the insulated gate bipolar transistor is used to control the on and off of the circuit of the heating component according to the high-level signal or low-level signal output by the single-chip microcomputer.

[0026] To achieve one of the above-mentioned invention purposes, an embodiment of the present invention provides a control device for a heater, the heater includes a heating component, and the control device includes:

[0027] A detection circuit for acquiring the electrical parameters of the heating component, wherein the electrical parameters include at least one of voltage parameters, current parameters, and resistance parameters;

[0028] A control circuit for controlling the on and off of the circuit of the heating component. When the electrical parameters reach a preset electrical parameter range, the control circuit controls the cut-off of the circuit of the heating component; or, the control circuit determines the corresponding temperature parameter according to the electrical parameters, and when the temperature parameter reaches a preset temperature range, the control circuit controls the cut-off of the circuit of the heating component.

[0029] Compared with the prior art, the present invention has the following beneficial effects: The heating component of the heater and its control device simultaneously achieve heating and temperature detection. On the one hand, the judgment of whether the temperature is too high or whether there is dry burning can be realized through the electrical parameters or the corresponding temperature parameters of the heating component. The structure of the heater is more concise, avoiding the use of a large number of temperature sensors, reducing the cost and eliminating the problems of installation and maintenance of temperature sensors. On the other hand, compared with the detection of only the surrounding area by the temperature sensor during detection, the heater can judge the entire heating range, which can better reflect the overall working state of the heater, so the detection result is relatively accurate, that is, the heater and its control device can perform temperature detection with a concise structure and high precision. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of a heater according to an embodiment of the present invention;

[0031] Figure 2 is a schematic structural diagram of a heating component according to an embodiment of the present invention;

[0032] Figure 3It is a schematic diagram of the relationship between resistance value and temperature according to an embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of the temperature-resistance value comparison table according to an embodiment of the present invention;

[0034] Figure 5 It is a schematic circuit diagram of a heater according to an embodiment of the present invention;

[0035] Among them, 1000 is the heater; 100 is the heating component; 10 is the heating layer; 11 is the resistance layer; 12 is the electrode layer; 101 is the left heating layer; 102 is the right heating layer; 20 is the substrate; 30 is the first insulating layer; 40 is the second insulating layer; 200 is the heating body; 210 is the liquid inlet side; 211 is the liquid inlet; 220 is the liquid outlet side; 221 is the liquid outlet; 300 is the sealing ring; 400 is the back plate. Detailed implementation manners

[0036] The present invention will be described in detail below in conjunction with the specific implementation manners shown in the drawings. However, these implementation manners do not limit the present invention, and any structural, method, or functional transformation made by those of ordinary skill in the art according to these implementation manners is included in the protection scope of the present invention.

[0037] It should be understood that the terms indicating relative spatial positions such as "upper", "above", "lower", "below", etc. used herein are for the purpose of facilitating description of the relationship between one unit or feature and another unit or feature as shown in the drawings. The terms of relative spatial positions may be intended to include different orientations of the device in use or operation other than the orientation shown in the figures.

[0038] An embodiment of the present invention provides a heater and its control device with lower cost and convenient and accurate temperature detection.

[0039] The heater 1000 according to an embodiment of the present invention is as Figure 1 shown, and includes a heating body 200, a sealing ring 300, a heating component 100, and a back plate 400. In addition, the heater 1000 may further include a temperature control device disposed inside or outside the heating body 200. A pipeline for the fluid medium to flow through is provided inside the heating body 200, and the heating component 100 is used to heat the fluid medium. The heater 1000 includes a liquid inlet 211 and a liquid outlet 221 arranged side by side in the first direction.

[0040] To clearly express the positions and directions described in this embodiment, in this embodiment, the first direction is defined as the left-right direction. Here, the left side can be defined as the liquid inlet 211, and the right side can be defined as the liquid outlet 221. The liquid flows in from the liquid inlet 211 on the left side, and after being heated by the heating component 100 in the pipeline of the heating body 200, it flows out from the liquid outlet 221 on the right side.

[0041] Continue as Figure 1 shown. In this embodiment, the heating body 200 further includes a liquid inlet side 210 on the left and a liquid outlet side 220 on the right. The liquid inlet side 210 communicates with the liquid inlet 211, and the liquid outlet side 220 communicates with the liquid outlet 221. If the liquid inlet 211 stops feeding liquid and there is very little or even no fluid medium to be heated in the pipeline, a dry burning phenomenon will occur. When dry burning occurs, the temperature inside the heating body 200 will rise rapidly, causing an accident and even burning out the heater 1000.

[0042] The temperature control device includes a control circuit and a detection circuit. Among them, the control circuit is used to control the on and off of the circuit of the heating component 100, and the detection circuit is used to obtain the electrical parameters of the heating component 100. The electrical parameters include at least one of voltage parameters, current parameters, and resistance parameters. That is to say, the detection circuit can obtain one or more of the current, voltage, resistance and other parameters of the heating component 100, including many situations. For example: if both the current and voltage are not fixed, then both the current and voltage are obtained at the same time to determine the corresponding resistance; or if the voltage is fixed and the current is not fixed, that is, in the constant voltage source scenario, only the current needs to be obtained to determine the corresponding resistance; or if the current is fixed and the voltage is not fixed, that is, in the constant current source scenario, only the voltage needs to be obtained to determine the corresponding resistance.

[0043] Here, the corresponding resistance can be obtained through the electrical parameters. The resistance of different materials has different corresponding relationships with temperature. For example, some resistance values increase with the increase of temperature, and some resistance values decrease with the increase of temperature. According to their respective corresponding relationships, the current temperature corresponding to the current electrical parameters of the material used can be determined. The way to turn on and off the circuit of the heating component 100 can either be to conduct electricity and cut off the power to the circuit, or to adjust it to a very low gear so that it is in a state of hardly generating heat.

[0044] This embodiment includes two implementation manners. In Implementation Manner 1, when the electrical parameters reach the preset electrical parameter range, the control circuit controls the circuit of the heating component 100 to be cut off.

[0045] In Implementation Manner 2, the control circuit determines the corresponding temperature parameter according to the electrical parameters. When the temperature parameter reaches the preset temperature range, the control circuit controls the circuit of the heating component 100 to be cut off.

[0046] Since the electrical parameters can correspond to the temperature, so corresponding to Implementation Manner 1, the electrical parameters corresponding to the preset high temperature range can be determined first. The preset electrical parameter range is the electrical parameters within the corresponding high temperature range. When reaching within this preset electrical parameter range, the corresponding temperature is too high at this time, so the control circuit controls the circuit of the heating component 100 to be cut off.

[0047] Corresponding to Embodiment 2, the preset temperature range is the pre-determined high temperature range. Based on the corresponding relationship between the resistance value of the material and the temperature, the corresponding temperature parameter can be determined through electrical parameters, and then it can be determined whether the current temperature reaches the preset temperature range. If it reaches, the circuit of the heating component 100 is controlled to be cut off.

[0048] As Figure 2 shown, the heater 1000 includes a heating body 200. The heating component 100 includes a substrate 20, a first insulating layer 30, a heating layer 10, and a second insulating layer 40 that are fixedly connected in sequence. The substrate 20 is fixedly connected to the heating body 200, and the substrate 20 serves to fixedly support the entire heating component 100. The connection manner between the substrate 20 and the heating body 200 can be a detachable manner such as bolt connection. The heating layer 10 is insulated and disposed between the first insulating layer 30 and the second insulating layer 40. The first insulating layer 30 and the second insulating layer 40 prevent the current on the heating layer 10 from leaking externally. The heating layer 10 can retain a resistance layer 11 and an electrode layer 12. The resistance layer 11 is used for heating, and a plurality of resistance layers 11 are provided. The electrode layer 12 energizes these resistors by connecting these resistance layers 11 in series in sequence. The material of the resistance layer 11 can be set as a silver-palladium material.

[0049] In this embodiment, specifically in the field of new energy vehicles described in the background art, it is generally powered by a DC power battery, and the power of the heater 1000 itself is adjustable. There are two requirements for the power here. On the one hand, the power adjustment range needs to be as large as possible, for example, between 0 and 8 kilowatts. A larger adjustment range corresponds to more adjustment freedoms, and a large power corresponds to large voltage and current fluctuations. On the other hand, once the power gear is selected, it needs to be as stable as possible at this power during heating. When the current increases or the voltage increases, by adjusting the decrease of another parameter, the power can be kept as stable as possible. Therefore, the electrical parameters obtained by the detection circuit in this embodiment include voltage parameters and current parameters, and the control circuit determines the current resistance parameter according to the ratio of the current voltage parameter and current parameter.

[0050] Corresponding to Embodiment 1 above, when the resistance parameter reaches the preset resistance parameter range, the control circuit controls the circuit of the heating component 100 to be cut off.

[0051] Corresponding to Embodiment 2 above, the control circuit determines the corresponding temperature parameter according to the resistance parameter. When the temperature parameter reaches the preset temperature range, the control circuit controls the circuit of the heating component 100 to be cut off.

[0052] Further, the heating component 100 of this embodiment uses a positive temperature coefficient characteristic material, that is, a material whose resistance value shows an increasing trend as the temperature rises, and the higher the temperature, the greater the resistance value. The corresponding relationship between the resistance value of one of its materials and the temperature refers toFigure 3 as shown

[0053] Corresponding to Embodiment 1, the preset resistance parameter range includes a minimum resistance threshold. When the resistance parameter is greater than the minimum resistance threshold in the preset resistance parameter range, the control circuit controls the disconnection of the circuit of the heating component 100;

[0054] Or

[0055] Corresponding to Embodiment 2, the preset temperature range includes a minimum temperature threshold. When the temperature parameter is greater than the minimum temperature threshold, the control circuit controls the disconnection of the circuit of the heating component 100.

[0056] Further, in one embodiment, the resistance parameter and the corresponding temperature parameter are determined according to the formula:

[0057] wherein, R h is the resistance parameter, T h is the temperature parameter, TCR is the temperature coefficient, c is the reference temperature, and R c is the resistance value at the reference temperature.

[0058] TCR is related to the material used in the current environment. The reference temperature c can be 25°C at room temperature. Assuming the maximum temperature is 300°C, if it exceeds 300°C, it is considered unsafe. In this way, T h is 300. Through this formula, the corresponding resistance parameter can be calculated. That is to say, if the resistance value determined by the electrical parameter is greater than the resistance value calculated by this formula, it is considered that the temperature is too high and heating needs to be stopped.

[0059] In addition, this formula can also be transformed to calculate the current temperature T h through the current resistance R h , and then determine whether it is greater than the minimum temperature threshold. The specific transformation method and calculation method can be adjusted according to needs.

[0060] Or, in another embodiment, the resistance parameter and the corresponding temperature parameter are determined according to the temperature-resistance value conversion table. The temperature is determined by looking up the table. One example of the temperature-resistance value conversion table is shown Figure 4 as follows. According to the current resistance value, the corresponding temperature is found in the table.

[0061] In addition, materials with negative temperature coefficient of resistance characteristics can also be used, that is, materials whose resistance value decreases with the increase of temperature. The specific implementation process can be adjusted in the opposite direction according to the above content.

[0062] Further, the heating layer 10 includes a plurality of sub - heating layers 10. The detection circuit respectively obtains the electrical parameters of each sub - heating layer 10, and the control circuit respectively controls the on - off of the circuits of each sub - heating layer 10.

[0063] The plurality of sub - heating layers 10 of this embodiment are arranged in parallel along the first direction. Referring to the structure that the heating body 200 further includes a liquid inlet side 210 on the left and a liquid outlet side 220 on the right, two sub - heating layers 10 are provided, namely a left heating layer 101 and a right heating layer 102. The left heating layer 101 is used to heat the liquid inlet side 210, and the right heating layer 102 is used to heat the liquid outlet side 220. Different sub - heating layers 10 heat different areas, sample the left and right sides of the heater 1000 respectively, and judge respectively.

[0064] Further, the heater 1000 further includes at least one thermistor sensor. The detection circuit obtains the thermistor resistance value of each thermistor sensor, and the control circuit compares the temperature parameter corresponding to the electrical parameter with the temperature value corresponding to each thermistor resistance value, determines the comparison result, and controls the cutting off of the circuit of the heating component 100 according to the comparison result. The temperature value detected by the thermistor sensor can play a role in temperature calibration. Since its purpose is calibration rather than determining the temperature at each position, only one thermistor sensor needs to be set at most, which can also greatly save costs compared with the traditional scheme with temperature sensors at multiple positions.

[0065] Further, the circuit schematic diagram of the heater 1000 is as Figure 5 shown. The figure shows an example of connecting two heaters 1000. The control circuit of the control circuit includes a single - chip microcomputer and an insulated - gate bipolar transistor (IGBT). The insulated - gate bipolar transistor is used to control the on - off of the circuit of the heating layer 10 according to the high - level signal or low - level signal output by the single - chip microcomputer. The single - chip microcomputer obtains the electrical parameters from the electrical parameter acquisition part, and according to the above - mentioned logic, issues a low - level signal for cutting off the heating layer 10 or a high - level signal for turning on the heating layer 10.

[0066] Compared with the conventional technology, the present embodiment has the following beneficial effects: The heating component 100 of the heater 1000 and its control device simultaneously achieve heating and temperature detection. On the one hand, the judgment of whether the temperature is too high or whether there is dry burning can be realized through the electrical parameters or the corresponding temperature parameters of the heating component 100. The structure of the heater 1000 is more concise, avoiding the use of a large number of temperature sensors, reducing the cost and eliminating the problems of installation and maintenance of temperature sensors. On the other hand, compared with the detection of only the surrounding area by the temperature sensor during detection, the heater 1000 can judge the entire heating range, which can better reflect the overall working state of the heater 1000. Therefore, the detection result is relatively accurate, that is, the heater 1000 and its control device can perform temperature detection with a concise structure and high precision.

[0067] It should be understood that although this specification is described according to embodiments, not each embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0068] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiments or changes made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A heater, comprising a heating component and a temperature control device, characterized in that, The temperature control device includes a control circuit and a detection circuit. The control circuit is used to control the on and off of the circuit of the heating component, and the detection circuit is used to obtain the electrical parameters of the heating component. Among them, the electrical parameters include at least one of voltage parameters, current parameters, and resistance parameters; When the electrical parameter reaches the preset electrical parameter range, the control circuit controls the disconnection of the circuit of the heating component; Or, The control circuit determines the corresponding temperature parameter according to the electrical parameter. When the temperature parameter reaches the preset temperature range, the control circuit controls the disconnection of the circuit of the heating component.

2. The heater according to claim 1, wherein The electrical parameters obtained by the detection circuit include voltage parameters and current parameters, and the control circuit determines the resistance parameter according to the ratio of the voltage parameter and the current parameter; When the resistance parameter reaches the preset resistance parameter range, the control circuit controls the disconnection of the circuit of the heating component; Or, The control circuit determines the corresponding temperature parameter according to the resistance parameter. When the temperature parameter reaches the preset temperature range, the control circuit controls the disconnection of the circuit of the heating component.

3. The heater according to claim 2, characterized in that, The heating component uses a material with positive temperature coefficient of resistance characteristics; The preset resistance parameter range includes a minimum resistance threshold. When the resistance parameter is greater than the minimum resistance threshold in the preset resistance parameter range, the control circuit controls the disconnection of the circuit of the heating component; Or, The preset temperature range includes a minimum temperature threshold. When the temperature parameter is greater than the minimum temperature threshold, the control circuit controls the disconnection of the circuit of the heating component.

4. The heater according to claim 3, characterized in that, The resistance parameter and the corresponding temperature parameter are determined according to a formula, and the formula is: wherein, R h is the resistance parameter, T h is the temperature parameter, TCR is the temperature coefficient, c is the reference temperature, and R c is the resistance value at the reference temperature; Or, The resistance parameter and the corresponding temperature parameter are determined according to the temperature and resistance value comparison table.

5. The heater according to claim 1, characterized in that, The heater includes a heating body. The heating component includes a substrate, a first insulating layer, a heating layer, and a second insulating layer that are fixedly connected in sequence. The substrate is fixedly connected to the heating body, and the heating layer is insulatingly arranged between the first insulating layer and the second insulating layer.

6. The heater according to claim 5, characterized in that, The heating layer includes a plurality of sub-heating layers. The detection circuit respectively obtains the electrical parameters of each sub-heating layer, and the control circuit respectively controls the on and off of the circuits of each sub-heating layer.

7. The heater according to claim 6, characterized in that, A pipeline for the fluid medium to flow through is arranged in the heating body, and the heating layer is used to heat the fluid medium; The heater includes a liquid inlet and a liquid outlet arranged side by side in a first direction, and the plurality of sub-heating layers are arranged side by side in the first direction.

8. The heater according to claim 1, characterized in that, The heater further includes at least one thermistor sensor. The detection circuit obtains the thermistor resistance value of each thermistor sensor. The control circuit compares the temperature parameter corresponding to the electrical parameter with the temperature value corresponding to each thermistor resistance value, determines the comparison result, and controls the disconnection of the circuit of the heating component according to the comparison result.

9. The heater according to claim 1, characterized in that The control circuit includes a single-chip microcomputer and an insulated gate bipolar transistor. The insulated gate bipolar transistor is used to control the on and off of the circuit of the heating component according to the high-level signal or low-level signal output by the single-chip microcomputer.

10. A control device for a heater, the heater comprising a heating assembly, characterized in that, The control device includes: A detection circuit for obtaining electrical parameters of the heating component, where the electrical parameters include at least one of voltage parameters, current parameters, and resistance parameters; A control circuit for controlling the connection and disconnection of the circuit of the heating component. When the electrical parameters reach a preset electrical parameter range, the control circuit controls the disconnection of the circuit of the heating component; or, the control circuit determines a corresponding temperature parameter according to the electrical parameters. When the temperature parameter reaches a preset temperature range, the control circuit controls the disconnection of the circuit of the heating component.

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