CN113059979A - Heating circuit of electric automobile and electric automobile - Google Patents
Heating circuit of electric automobile and electric automobile Download PDFInfo
- Publication number
- CN113059979A CN113059979A CN202110326018.0A CN202110326018A CN113059979A CN 113059979 A CN113059979 A CN 113059979A CN 202110326018 A CN202110326018 A CN 202110326018A CN 113059979 A CN113059979 A CN 113059979A
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- Prior art keywords
- circuit
- resistor
- fusing
- heating
- heating circuit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
- B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The application discloses electric automobile's heating circuit and electric automobile, wherein, the circuit includes: a fusing circuit and a heating circuit; the sampler is used for collecting the actual current of the heating circuit; the driving circuit is respectively connected with the sampler and the heating circuit; and the control circuit is respectively connected with the sampler and the driving circuit so as to judge that the driving circuit is short-circuited when the actual current is greater than the preset current, and control the driving circuit to send a driving signal to the fusing circuit, so that the fusing circuit executes fusing action and stops the heating circuit from working. Therefore, the problem that the cost is high or the potential safety hazard is large in the scheme of controlling PTC heating in the related technology is solved, and the safety and the reliability of the vehicle are greatly improved.
Description
Technical Field
The application relates to the technical field of electric automobiles, in particular to a heating circuit of an electric automobile and the electric automobile.
Background
The heating method of the air conditioning system of the electric vehicle is generally to heat a Positive Temperature Coefficient (PTC) resistor and send the heat generated by the PTC resistor to the cab of the vehicle through an air duct.
In the related art, the ways of controlling PTC heating are mainly two: (1) switching on and off the PTC by adopting a relay intermittent switch mode; (2) the power of the PTC is controlled by the switch of the semiconductor device.
However, with the first approach, relay life is greatly affected and relay cost is increased; for the second mode, if a short circuit occurs due to failure of the semiconductor device, the PTC will be heated continuously, which has a greater potential safety hazard and needs to be solved urgently.
Content of application
The application provides an electric automobile's heating circuit and electric automobile to solve the scheme about control PTC heating among the correlation technique, the higher problem of cost or potential safety hazard is great, promoted the security and the reliability of vehicle greatly.
An embodiment of an aspect of the present application provides a heating circuit of an electric vehicle, including:
a fusing circuit and a heating circuit;
the sampler is used for collecting the actual current of the heating circuit;
the driving circuit is respectively connected with the sampler and the heating circuit; and
and the control circuit is respectively connected with the sampler and the driving circuit so as to judge that the driving circuit is short-circuited when the actual current is greater than the preset current, and control the driving circuit to send a driving signal to the fusing circuit, so that the fusing circuit executes fusing action and stops the heating circuit to work.
Optionally, the driving circuit includes:
a signal generator for transmitting a driving signal;
one end of the first resistor is connected with the signal generator;
one end of the second resistor is connected with the low-voltage end of the high-voltage bus, and the other end of the second resistor is connected with the other end of the first resistor;
and the base electrode of the first triode is connected with the other end of the second resistor, the collector electrode of the first triode is connected with the other end of the heating circuit, and the emitting electrode of the first triode is connected with the other end of the sampler.
Optionally, the fuse circuit comprises:
one end of the fuse is connected with the high-voltage end of the high-voltage bus, and the other end of the fuse is connected with the heating circuit;
one end of the third resistor is connected with the signal generator;
one end of the fourth resistor is connected with the low-voltage end of the high-voltage bus, and the other end of the fourth resistor is connected with the other end of the third resistor;
and the base electrode of the second triode is connected with the other end of the third resistor, the collector electrode of the second triode is connected with the other end of the fuse, and the emitting electrode of the second triode is connected with the low-voltage end of the high-voltage bus.
Optionally, the heating circuit comprises:
a PTC thermistor.
Optionally, the method further comprises:
one end of the fifth resistor is connected with the control circuit, and the other end of the fifth resistor is connected with one end of the sampler;
and one end of the capacitor is connected with one end of the fifth resistor, and the other end of the capacitor is connected with the low-voltage end of the high-voltage bus.
Optionally, the method further comprises:
and when the fusing circuit executes fusing action, the control circuit is also used for controlling the at least one acoustic reminding device to carry out acoustic reminding.
Optionally, the method further comprises:
and when the fusing circuit executes fusing action, the control circuit is also used for controlling the at least one optical reminding device to carry out optical reminding. Another embodiment of the present application provides a vehicle, which includes the heating circuit of the electric vehicle described above.
Therefore, by adding the fusing circuit, the fusing circuit does not work when the heating circuit works normally; when short-circuit fault occurs, the fusing circuit is controlled to be switched on, so that the fuse is short-circuited to the ground, the fuse is fused, the heating circuit stops working, and other high-voltage components of the whole vehicle do not influence working, so that the problems of high cost or great potential safety hazard in the scheme of controlling PTC heating in the related technology are solved, and the safety and the reliability of the vehicle are greatly improved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic circuit diagram of a heating circuit of an electric vehicle according to an embodiment of the present application;
FIG. 2 is an exemplary diagram of a drive signal and a current sample signal according to one embodiment of the present application;
FIG. 3 is a block schematic diagram of a vehicle according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The heating circuit of the electric vehicle and the electric vehicle according to the embodiment of the present application are described below with reference to the drawings. Aiming at the problems that the cost is high or the potential safety hazard is large in the scheme for controlling the PTC heating mentioned in the background technology center, the application provides the heating circuit of the electric automobile, and the fusing circuit does not work when the heating circuit works normally by adding the fusing circuit; when short-circuit fault occurs, the fusing circuit is controlled to be switched on, so that the fuse is short-circuited to the ground, the fuse is fused, the heating circuit stops working, and other high-voltage components of the whole vehicle do not influence working, so that the problems of high cost or great potential safety hazard in the scheme of controlling PTC heating in the related technology are solved, and the safety and the reliability of the vehicle are greatly improved.
Specifically, fig. 1 is a schematic circuit diagram of a heating circuit of an electric vehicle according to an embodiment of the present application.
As shown in fig. 1, the heating circuit 10 of the electric vehicle includes: fuse circuit 100, heating circuit 200, sampler R7, drive circuit 300, and control circuit 400.
Wherein the sampler R7 is used to collect the actual current of the heating circuit 200.
The driving circuit 300 is connected to the sampler R7 and the heating circuit 200, respectively.
Among them, in some embodiments, the driving circuit 300 includes: the driving circuit comprises a signal generator 301, a first resistor R2 and a second resistor R4, wherein the signal generator 301 is used for sending a driving signal; one end of the first resistor R2 is connected with the signal generator 301; one end of the second resistor R4 is connected with the low-voltage end HV < - > of the high-voltage bus, and the other end of the second resistor R4 is connected with the other end of the first resistor R2; and a first triode Q1, wherein the base electrode of the first triode Q1 is connected with the other end of the second resistor R4, the collector electrode of the first triode Q1 is connected with the other end of the heating circuit 200, and the emitter electrode of the first triode Q1 is connected with the other end of the sampler R7.
The control circuit 400 is respectively connected to the sampler R7 and the driving circuit 300, so as to determine that the driving circuit 300 is short-circuited when the actual current is greater than the preset current, and control the driving circuit 300 to send a driving signal to the fuse circuit 100, so that the fuse circuit 100 performs a fusing action to stop the heating circuit.
Optionally, in some embodiments, the fuse circuit 100 includes: fuse F1, third resistor R3, fourth resistor R5 and second triode Q2. One end of the fuse F1 is connected with a high-voltage end HV + of the high-voltage bus, and the other end of the fuse F1 is connected with the heating circuit 200; one end of the third resistor R3 is connected with the signal generator 301; one end of the fourth resistor R5 is connected with the low-voltage end HV < - >, and the other end of the fourth resistor R5 is connected with the other end of the third resistor R3; the base of the second triode Q2 is connected with the other end of the third resistor R3, the collector of the second triode Q2 is connected with the other end of the fuse, and the emitter of the second triode Q2 is connected with the low-voltage end HV < - >, of the high-voltage bus.
It should be noted that the first resistor R2 and the third resistor R3 are both current-limiting resistors, which can prevent the transistor from being burned out due to an excessive base current, and the first resistor R2 and the third resistor R3 have a current-limiting function; the second resistor R4 and the fourth resistor R5 are pull-down resistors, and the base electrodes are pulled down to a determined low level, so that misoperation can be effectively prevented.
Optionally, in some embodiments, the heating circuit 200 of the electric vehicle further includes: a fifth resistor R6 and a capacitor C1. One end of the fifth resistor R6 is connected with the control circuit 400, and the other end of the fifth resistor R6 is connected with one end of the sampler R7; one end of the capacitor C1 is connected with one end of the fifth resistor R6, and the other end of the capacitor C1 is connected with the low-voltage end HV-of the high-voltage bus. Therefore, a filter circuit is formed by the fifth resistor R6 and the capacitor C1, and the signal collected by the sampler R7 is filtered and sent to the control circuit 400.
Optionally, in some embodiments, the heating circuit 200 comprises: a PTC thermistor.
Specifically, as shown in FIG. 2, the high voltage end of the high voltage bus bar is HV +, and the low voltage end of the high voltage bus bar is HV-. In normal operation, HV + passes through fuse F1 to the PTC thermistor. The signal generator can send out a PWM signal to drive the first triode Q1, the sampler R7 is a current sampling resistor, the sampling signal is sent to the control circuit 400 after passing through an RC filter consisting of a fifth resistor R6 and a capacitor C1, and the control circuit 400 carries out closed-loop control by calculating the power of the PTC. At this time, the second transistor Q2 is in an off state, and the driving signal and the current sampling signal of the first transistor Q1 can be as shown in fig. 2.
If the first transistor is short-circuited by Q1 failure, the PTC will be in a continuous operation, i.e. continuously heating, and if the fan is not turned on or turned on very little, the local heat build-up will have serious consequences, e.g. explosion, etc. At this time, the PTC current is continuous, and the control circuit 400 judges by the driving signal that if the driving signal is not continuous high, it can be considered that the semiconductor switching device (i.e., the first transistor Q1) is short-circuited, and the fuse F1 cannot be blown due to the current limiting function of the PTC resistor itself.
Therefore, the control circuit 400 of the embodiment of the present application may send a signal to the signal generator 301, the signal generator 301 sends a high level to the base of the second transistor Q2, the second transistor Q2 is turned on, and the fuse F1 is directly shorted to the ground and instantly blown, thereby implementing a protection effect on the heating circuit 200.
Further, in some embodiments, the heating circuit 200 of the electric vehicle further includes: the control circuit 400 is further configured to control the at least one acoustic reminding device to perform acoustic reminding when the fusing circuit 100 performs the fusing action.
It should be understood that the acoustic reminding device may be a warning horn, and when the fusing circuit 100 performs the fusing action, the control circuit 400 may control the warning horn to emit a warning sound or a tone to remind the relevant person "fuse fusing, please note", so as to realize the acoustic reminding.
Optionally, in some embodiments, the heating circuit 200 of the electric vehicle further includes: the control circuit 400 is further configured to control the at least one optical reminding device to perform optical reminding when the fusing circuit 100 performs the fusing operation.
It can be understood that the optical reminding device can be a led (light-emitting diode) lamp, and when the fusing circuit 100 performs the fusing operation, the control circuit 400 can control the led lamp to emit light, so as to realize the optical reminding.
It should be noted that, in the embodiment of the present application, when the fusing circuit 100 executes the fusing action, the control may be performed simultaneously, and the warning speaker is controlled to emit the warning sound, and the led lamp emits light, so as to achieve the purpose of prompting the fault in multiple directions.
According to the heating circuit of the electric automobile, the fusing circuit is added, so that the fusing circuit does not work when the heating circuit works normally; when short-circuit fault occurs, the fusing circuit is controlled to be switched on, so that the fuse is short-circuited to the ground, the fuse is fused, the heating circuit stops working, and other high-voltage components of the whole vehicle do not influence working, so that the problems of high cost or great potential safety hazard in the scheme of controlling PTC heating in the related technology are solved, and the safety and the reliability of the vehicle are greatly improved.
In addition, as shown in fig. 3, the embodiment of the present application also provides a vehicle 20. The vehicle 20 includes the above-described heating circuit 10 for an electric vehicle.
According to the vehicle provided by the embodiment of the application, through the heating circuit of the electric vehicle, the problems of high cost or great potential safety hazard in the scheme of controlling PTC heating in the related technology are solved, and the safety and the reliability of the vehicle are greatly improved.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (8)
1. A heating circuit for an electric vehicle, comprising:
a fusing circuit and a heating circuit;
the sampler is used for collecting the actual current of the heating circuit;
the driving circuit is respectively connected with the sampler and the heating circuit; and
and the control circuit is respectively connected with the sampler and the driving circuit so as to judge that the driving circuit is short-circuited when the actual current is greater than the preset current, and control the driving circuit to send a driving signal to the fusing circuit, so that the fusing circuit executes fusing action and stops the heating circuit to work.
2. The circuit of claim 1, wherein the driver circuit comprises:
a signal generator for transmitting a driving signal;
one end of the first resistor is connected with the signal generator;
one end of the second resistor is connected with the low-voltage end of the high-voltage bus, and the other end of the second resistor is connected with the other end of the first resistor;
and the base electrode of the first triode is connected with the other end of the second resistor, the collector electrode of the first triode is connected with the other end of the heating circuit, and the emitting electrode of the first triode is connected with the other end of the sampler.
3. The circuit of claim 1, wherein the fuse circuit comprises:
one end of the fuse is connected with the high-voltage end of the high-voltage bus, and the other end of the fuse is connected with the heating circuit;
one end of the third resistor is connected with the signal generator;
one end of the fourth resistor is connected with the low-voltage end of the high-voltage bus, and the other end of the fourth resistor is connected with the other end of the third resistor;
and the base electrode of the second triode is connected with the other end of the third resistor, the collector electrode of the second triode is connected with the other end of the fuse, and the emitting electrode of the second triode is connected with the low-voltage end of the high-voltage bus.
4. The circuit of claim 1, wherein the heating circuit comprises:
a PTC thermistor.
5. The circuit of claim 1, further comprising:
one end of the fifth resistor is connected with the control circuit, and the other end of the fifth resistor is connected with one end of the sampler;
and one end of the capacitor is connected with one end of the fifth resistor, and the other end of the capacitor is connected with the low-voltage end of the high-voltage bus.
6. The circuit of claim 1, further comprising:
and when the fusing circuit executes fusing action, the control circuit is also used for controlling the at least one optical reminding device to carry out acoustic reminding.
7. The circuit of claim 1, further comprising:
and when the fusing circuit executes fusing action, the control circuit is also used for controlling the at least one optical reminding device to carry out optical reminding.
8. A vehicle, characterized by comprising: the heating circuit of an electric vehicle as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110326018.0A CN113059979A (en) | 2021-03-26 | 2021-03-26 | Heating circuit of electric automobile and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110326018.0A CN113059979A (en) | 2021-03-26 | 2021-03-26 | Heating circuit of electric automobile and electric automobile |
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| Publication Number | Publication Date |
|---|---|
| CN113059979A true CN113059979A (en) | 2021-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110326018.0A Pending CN113059979A (en) | 2021-03-26 | 2021-03-26 | Heating circuit of electric automobile and electric automobile |
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| Country | Link |
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| CN (1) | CN113059979A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1630013A1 (en) * | 2004-08-31 | 2006-03-01 | Catem GmbH & Co. KG | Electric supplementary heating for vehicles with current safety |
| CN204055563U (en) * | 2014-07-18 | 2014-12-31 | 北京汽车研究总院有限公司 | A kind of vehicle-mounted wire fuse fault alert device and automobile |
| CN209460348U (en) * | 2019-01-30 | 2019-10-01 | 长城汽车股份有限公司 | The short-circuit detecting device and electric car of power switch in electric machine controller |
| CN212386323U (en) * | 2020-05-11 | 2021-01-22 | 上海汽车集团股份有限公司 | Electric automobile power-on device |
-
2021
- 2021-03-26 CN CN202110326018.0A patent/CN113059979A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1630013A1 (en) * | 2004-08-31 | 2006-03-01 | Catem GmbH & Co. KG | Electric supplementary heating for vehicles with current safety |
| CN204055563U (en) * | 2014-07-18 | 2014-12-31 | 北京汽车研究总院有限公司 | A kind of vehicle-mounted wire fuse fault alert device and automobile |
| CN209460348U (en) * | 2019-01-30 | 2019-10-01 | 长城汽车股份有限公司 | The short-circuit detecting device and electric car of power switch in electric machine controller |
| CN212386323U (en) * | 2020-05-11 | 2021-01-22 | 上海汽车集团股份有限公司 | Electric automobile power-on device |
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Application publication date: 20210702 |
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