EP3417672A1 - Elektrische vorrichtung, insbesondere heizer, sowie vorrichtung und verfahren zur ansteuerung einer elektrischen vorrichtung - Google Patents
Elektrische vorrichtung, insbesondere heizer, sowie vorrichtung und verfahren zur ansteuerung einer elektrischen vorrichtungInfo
- Publication number
- EP3417672A1 EP3417672A1 EP17705617.3A EP17705617A EP3417672A1 EP 3417672 A1 EP3417672 A1 EP 3417672A1 EP 17705617 A EP17705617 A EP 17705617A EP 3417672 A1 EP3417672 A1 EP 3417672A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating
- circuit
- voltage
- value
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/02—Heaters using heating elements having a positive temperature coefficient
Definitions
- Electric device in particular heater, and device and method for
- the invention relates to an electrical device such as a heater, which is optionally designed for motor vehicles or for other rooms or objects to be heated. Furthermore, the invention relates to a method for driving an electrical device, e.g. an electrical circuit, and a use. From DE 2013/103433 A1 an electrical device in the form of a heater is known, which has an electronic circuit for controlling the heater.
- the heater may, for example, one or more heating elements in the form of PTC elements (Positive Temperature Coefficient - elements), whose
- PWM pulse-width modulation
- circuit breakers may, for example, semiconductor switches such as
- Bipolar transistors field effect transistors, IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), or MOSFETs (metal oxide semiconductor field effect transistors). If such a circuit breaker should have an error, such as a short circuit, a breakdown or an interruption, such error cases can i.a. to overheat the affected circuit breaker, for example in the event of a short circuit, or to overheat in parallel
- Circuit breakers for example, in case of interruption lead. This should be avoided for reasons of functional safety.
- radiators such as tubular heaters
- a cooling medium heater leads to a consequent error to overheat the entire heater and thus represents a potential fire hazard to the system, such as a vehicle dar.
- a potential fire hazard to the system such as a vehicle dar.
- ISO 26262 road vehicles - functional safety
- Overheating can e.g. be detected by providing an additional temperature sensor that can trigger a shutdown at too high a temperature.
- the invention has for its object to provide an electrical device that can detect functional errors in the control of the electrical device, such as a heater, in a compact, spatially and costly not increased form.
- an electrical device such as a heater, according to claim 1 is provided to solve this problem.
- Advantageous embodiments are specified in the subclaims. Furthermore, with the invention, a use of such a device
- a PWM drive is used for power control of one or more heating resistors. This PWM control allows precise control of the desired
- the drive frequency is a selectable parameter here.
- the functionality ie the correct function or possible malfunctions of the PWM switch can be monitored during operation, eg of the heating operation, in one, several or all embodiments of the invention. In this case, overheating, a short circuit or an interruption of the one or more PWM switches, or even an unwanted, static control of the PWM switch detected become.
- the inventively used monitoring and error detection so realized in embodiments of the invention and shown in the drawings diagnostic circuit is independent of the respective technology of the switch or the used (eg MOSFET, IGBT, relay, miscellaneous
- Embodiments of the invention make it possible to omit separate Schutrangstrom horren at several heating strands, which may for example be connected in parallel, but are independently controllable.
- Heating elements flowing current or a related size it is possible system or circuit failure of one or more
- Circuit components such as in PWM switches, occurring disturbances to recognize, without additional, separate components such as temperature sensors are required. This simplifies the circuit structure at high
- Embodiments of the invention allow e.g. an overheating detection of tubular heaters in a heater e.g. with high-frequency PWM control.
- Fig. 1 is a block diagram of an electrical or
- Fig. 2 shows an embodiment of an electrical device in the form of a
- FIG. 1 is a general block diagram of an electrical device 2 is shown, which can be supplied by a power supply 1 with voltage and / or power and monitored by an evaluation and control device 3 and switchable, for example, switched on, off or higher or lower
- the electrical device 2 can be, for example, an electrically operable heater, for example for a motor vehicle, a machine or another device.
- the evaluation / control device 3 monitors the electrical device 2
- the electrical device 2 has a heater with three heating resistors 10, 30, 40.
- the number of heating resistors may also be higher or lower, for example only one heating resistor, or even two, four, or more than four heating resistors.
- a heating element of a tubular heater can be considered as a series connection of an ohmic resistor RRHK and an inductor or coil LRHK, where RRHK optionally has a PTC behavior. That the ohmic resistance of the RHK increases with increasing temperature and is therefore a measure of the temperature. By monitoring the ohmic resistance during heating operation, the temperature of the RHK can thus be monitored.
- the heating resistor 10 has in this embodiment, a series circuit of an ohmic resistance 1 1 and an inductance 12, which as a separate
- Component may be formed, but in other cases operational or
- the heating resistor 10 is connected via its ohmic resistor 1 1 with a connection directly to a power supply via a line 8, at which the
- the other terminal of the heating resistor 10 or the series circuit of ohmic resistor 1 1 and, if present, inductance 12 is connected via a switch 15 and, optionally, via a further switch 16 and a measuring resistor 18 with reference potential 19.
- the switch 15 is formed, for example, as a transistor switch, which serves as a PWM switch and by a PWM control
- Control circuit 14 is switched on and off and controlled pulse width modulated.
- the further switch 16 serves as a common safety switch for all
- a measuring circuit 21 Connected to the measuring resistor 18 is a measuring circuit 21, which performs an average current measurement of all three heating currents of the heating resistors 10, 30, 40 and is connected to the two terminals of the measuring resistor 18 in order to detect the current flowing through the measuring resistor 18.
- heating resistors 10, 30, 40 are provided.
- the heating resistors 30, 40 are constructed the same as the heating resistor 10 described in detail above, and thus each likewise have an ohmic resistance and an inductance connected in series therewith, possibly also as a fault.
- the heating resistors 30, 40 are the same as the
- Heating resistor 10 via its own PWM switch 31, 41 and a separate PWM control 32 and 42 (in the figure, with PWM control 2 or PWM control 3) connected to a common line 20, which outputs the PWM Switch 15, 31, 41 together with the switch 16 and connects via this with the measuring resistor 18.
- a single measuring circuit 21 for the current measurement of all, or at least some of the heating resistors 10, 30, 40 is sufficient, which further reduces the circuit complexity.
- the Measuring resistor 18 thus occurs the sum of all heating currents through the heating resistors 10, 30, 40 (l_Heiz_Summe (t)).
- the measuring circuit 21 performs a current measurement of the sum of the three heating currents of the heating resistors 10, 30, 40 on the summation of the heating currents on
- Measuring resistor 18 through and can mittein this current measurement in the form of an average value and their output signal via an output line 22 to an input 23 of an evaluation circuit 24, for example in the form of a microcontroller.
- the input 23 represents an analog input (analog port 2).
- At the input 23 of the evaluation circuit 24 is thus the averaged SummenMapstrom
- a supply voltage measuring signal representing the supply voltage (UHeiz), which corresponds to the supply voltage value occurring at the line 8 at the inputs of the heating resistors 10 , 30, 40 represents applied voltage.
- UHeiz the supply voltage
- For the measurement of the magnitude of the supply voltage is on line 8, a series circuit of two
- Resistors 26, 27 connected between the line 8 and the reference potential 19, so that at the tap between the series connection of the resistors 26, 27 the
- Evaluation circuit 24 is created. Thus, at the input of the evaluation circuit 25 there is both an input signal representing the supply voltage and an input signal (input 23) representing the measured, average current.
- an electrical device in the form of an electric heater which can be used to control the temperature of a component, for example in a motor vehicle, in the household sector, in the industrial sector or the like.
- Embodiments allow overheating detection, for example of tubular heaters in a heater with high frequency PWM control as a
- Embodiment of the invention thus allows according to one or more embodiments, an overheating detection of tubular heaters and thus can reduce the risk of fire, for example, in a vehicle that is not recognized by an unrecognized
- the PTC behavior of ohmic tubular heater resistors can be exploited, the heating resistors in this case being formed from a PTC material, that is to say having PTC behavior.
- Heating resistors LRHK, negligible.
- Each heating string may e.g. a separate current measurement for the peak, wherein a measurement of the high voltage voltage UHV, that is, the voltage applied to the heating resistors, is present.
- UHV high voltage voltage
- RRHK tubular heater resistance
- Z (t) Ui-iv (t) / lHeiz_summe_Mittei (t).
- Calculated variable Z can be determined for example by the embodiment of FIG. 2 and the evaluation circuit 24 shown there, at the inputs of the heating voltage or a derived therefrom by voltage division derived value on the one hand and the mean value of Schustromsumme lHeiz_summe_Mittei (t).
- n number of heating strands
- the circuit design according to the invention and / or the introduction of Z can reliably ensure overheating detection.
- the principle here is that Z becomes maximum when RRHK becomes maximum.
- the maximum pipe heater resistance RRHK_max occurring during normal heating operation can be determined by measurement, whereby the following boundary conditions can be set: PlaTing plaY max
- As an error condition can be set in this case Ziviess (v) ⁇ Z re f (v), ie if the measured value falls below the reference value.
- the advantages of overheating detection by means of such a reference curve are, inter alia, that only little circuitry complexity is required and that it works at all PWM frequencies.
- Other embodiments may include not only one reference curve but a plurality of reference curves
- the control of the heating power takes place in one or more embodiments by pulse width modulation (PWM) of the heating string currents.
- PWM pulse width modulation
- fpwM 66.6 Hz
- the resistance RRHK in each heating string can simply be determined as a quotient of measured HV voltage and peak current measured.
- Z (t) has the dimension of an impedance but is not the impedance of the tubular heater.
- Z In the steady state and assuming ideal switches and diodes, where the voltage drop is 0 V, Z has the following relationship:
- n number of heating strands
- the heating power is controlled by the power supply unit (high voltage power supply HV).
- ⁇ 24 makes sense to store a reference curve ZRef (RRHK_max_ref, v) in the EEPROM of the ⁇ 24, the value range of v comprising all setting values that are possible in heating mode.
- the computational cost of ⁇ 24 is limited to the computation of Z from the measurements of Ui-iv (t) and lHeiz_summe_mittei (t) and a subsequent comparison operation with the corresponding reference value.
- a more refined implementation is the use of multiple reference curves with different RRHK max ref, where each RRHK_ max ref is related to a particular r heating (e.g., 25% P heating max, 50% P heating max, 1 00% PHeiz_max). This has the advantage that one recognizes the case of error overheating faster.
- the most suitable Z reference curve is selected. If the heating requirement is lowered, the cooling time of the RHKs is taken into account. This means that as long as the RHKs are not yet in the thermally steady state, the diagnosis can be deactivated or a suitable transition function from one Z reference curve to the next Z reference curve is used.
- the overheating detection with the help of the Z calculation requires only a little circuit complexity and works at all PWM frequencies.
- the invention can also be used in other electrical circuits or consumers and not only in heaters such as tubular heaters.
- heaters such as tubular heaters.
- Power control for controlling the power level of a consumer can be realized in the manner described above.
Landscapes
- Control Of Resistance Heating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016102805 | 2016-02-17 | ||
| DE102016109039.5A DE102016109039A1 (de) | 2016-02-17 | 2016-05-17 | Elektrische Vorrichtung, insbesondere Heizer, sowie Vorrichtung und Verfahren zur Ansteuerung einer elektrischen Vorrichtung |
| PCT/EP2017/053505 WO2017140783A1 (de) | 2016-02-17 | 2017-02-16 | Elektrische vorrichtung, insbesondere heizer, sowie vorrichtung und verfahren zur ansteuerung einer elektrischen vorrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3417672A1 true EP3417672A1 (de) | 2018-12-26 |
| EP3417672B1 EP3417672B1 (de) | 2023-08-02 |
Family
ID=59410147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17705617.3A Active EP3417672B1 (de) | 2016-02-17 | 2017-02-16 | Elektrische vorrichtung, insbesondere heizer, sowie vorrichtung und verfahren zur ansteuerung einer elektrischen vorrichtung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3417672B1 (de) |
| DE (1) | DE102016109039A1 (de) |
| WO (1) | WO2017140783A1 (de) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017178490A1 (en) * | 2016-04-11 | 2017-10-19 | 4A Manufacturing Gmbh | Membrane plate structure for generating sound waves |
| DE102016216295A1 (de) * | 2016-08-30 | 2018-03-01 | Dbk David + Baader Gmbh | Elektrischer heizer und verfahren zum erkennen einer überhitzung eines solchen elektrischen heizers |
| DE102017109710A1 (de) | 2017-05-05 | 2018-11-08 | Dbk David + Baader Gmbh | Elektrische Heizvorrichtung und Verfahren zum Erkennen einer Überhitzung einer solchen elektrischen Heizvorrichtung |
| WO2019068710A1 (de) | 2017-10-06 | 2019-04-11 | Dbk David + Baader Gmbh | Heizmodul und fluidheizer und verfahren zur steuerung eines heizmoduls |
| FR3087990A1 (fr) * | 2018-10-25 | 2020-05-01 | Valeo Systemes Thermiques | Dispositif de chauffage |
| FR3088122B1 (fr) * | 2018-11-06 | 2021-01-22 | Valeo Systemes Thermiques | Procede de detection de surchauffe pour dispositif de chauffage et unite de commande correspondante |
| FR3088121B1 (fr) * | 2018-11-06 | 2020-11-13 | Valeo Systemes Thermiques | Procede de detection de surchauffe pour dispositif de chauffage et unite de commande correspondante |
| FR3088120A1 (fr) * | 2018-11-06 | 2020-05-08 | Valeo Systemes Thermiques | Procede de detection de surchauffe pour dispositif de chauffage et unite de commande correspondante |
| FR3101447B1 (fr) * | 2019-10-01 | 2022-07-29 | Valeo Systemes Thermiques | Procédé de gestion thermique, notamment pour véhicule automobile, et stratégie de gestion thermique et unité de commande associées |
| FR3101446B1 (fr) * | 2019-10-01 | 2021-10-01 | Valeo Systemes Thermiques | Procédé de gestion thermique, notamment pour véhicule automobile, et unité de commande associée |
| US11114842B1 (en) | 2020-05-27 | 2021-09-07 | Rockwell Automation Technologies, Inc. | Dual PWM relay driver with diagnostics for functional safety system |
| DE102023105751A1 (de) * | 2023-03-08 | 2024-09-12 | Preh Gmbh | Elektrischer Schaltungsaufbau für einen Mehrzonen-Heizbetrieb mit optionalem kapazitivem Messbetrieb zur Annäherungsdetektion, zugehöriges Lenkrad und Verfahren |
| CN116373538A (zh) * | 2023-03-31 | 2023-07-04 | 镇江海姆霍兹传热传动系统有限公司 | 热均衡管理方法、健康管理方法及电加热装置 |
| DE102023207264A1 (de) | 2023-07-28 | 2025-01-30 | Webasto SE | Elektrische Heizung |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100894008B1 (ko) * | 2007-11-16 | 2009-04-17 | 모딘코리아 유한회사 | 자동차의 보조전기가열장치 및 방법 |
| JP4894847B2 (ja) * | 2008-01-15 | 2012-03-14 | 株式会社デンソー | ヒータ劣化検出装置およびグロープラグ通電制御装置 |
| US8788223B2 (en) * | 2010-10-29 | 2014-07-22 | GM Global Technology Operations LLC | Comprehensive method of electrical fluid heating system fault detection and handling |
| SE535512C2 (sv) * | 2010-12-10 | 2012-09-04 | Scania Cv Ab | Komfortvärmestyrsystem för ett fordon försett med komfortvärmesystem med en eller flera värmeslingor |
| JP5884390B2 (ja) * | 2011-10-11 | 2016-03-15 | 株式会社デンソー | 発熱装置 |
| JP5827535B2 (ja) * | 2011-10-12 | 2015-12-02 | サンデンホールディングス株式会社 | 車載暖房用ヒータの制御装置 |
| DE102013103433A1 (de) | 2012-04-13 | 2013-10-17 | Dbk David + Baader Gmbh | Elektrischer Zuheizer |
| JP6384129B2 (ja) * | 2013-08-27 | 2018-09-05 | 株式会社デンソー | 車載用輻射ヒータ制御装置 |
-
2016
- 2016-05-17 DE DE102016109039.5A patent/DE102016109039A1/de active Pending
-
2017
- 2017-02-16 EP EP17705617.3A patent/EP3417672B1/de active Active
- 2017-02-16 WO PCT/EP2017/053505 patent/WO2017140783A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017140783A1 (de) | 2017-08-24 |
| DE102016109039A1 (de) | 2017-08-17 |
| EP3417672B1 (de) | 2023-08-02 |
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