CN217969175U - Low-voltage PTC heating control system of electric automobile - Google Patents
Low-voltage PTC heating control system of electric automobile Download PDFInfo
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- CN217969175U CN217969175U CN202222030200.4U CN202222030200U CN217969175U CN 217969175 U CN217969175 U CN 217969175U CN 202222030200 U CN202222030200 U CN 202222030200U CN 217969175 U CN217969175 U CN 217969175U
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Abstract
The utility model discloses an electric automobile low pressure PTC heating control system, including singlechip, level conversion circuit, PTC load, the one end of PTC load is connected with the anodal output of first vehicle-mounted low-voltage power supply, the other end of PTC load is connected with the negative pole output of first vehicle-mounted low-voltage power supply through switch circuit, switch circuit's control end is connected with the first output of singlechip, the first input of singlechip is connected with level conversion circuit's output, level conversion circuit's input and external signal input port are connected, receive outside control signal through external signal input port. Through collecting the PWM control signal that vehicle air conditioner controller sent, through level conversion circuit in the heater is inside, give the singlechip with the signal after the conversion, and MOS drive circuit is given with drive signal to rethread singlechip, and drive circuit goes to control MOSFET switch and further goes to the function of control PTC heating.
Description
Technical Field
The utility model belongs to the technical field of vehicle air conditioner heating, concretely relates to electric automobile low pressure PTC heating control system.
Background
With the progress of society, new energy has become a topic, and new energy automobile has become a main topic in the current automobile market, and its scope is gradually widened, and pure electric vehicles have promoted new energy automobile "fire" gradually because of the support of national subsidy policy and a series of good factors. In the face of the fire and heat market, some vehicle enterprises have already made clear the development of new energy vehicles, and have been reluctant to construct new energy industry chains so as to meet the requirements on emission and the like, and the new energy is regarded as the development focus in the future.
In the China Mobile enterprises, the layout of new energy products is accelerated, and new plans are issued and planned in a dispute to cope with the development trend of future new energy vehicles.
The heating function of the traditional automobile air conditioner is realized by taking engine cooling liquid as a heat source. After a pure electric vehicle does not have an engine, the applicant thinks that the functions of defrosting glass, heating seats and the like are realized by means of low-voltage PTC, so that a low-voltage PTC heating control system of a new energy electric vehicle is urgently developed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome at least one kind of defect among the prior art, provide an electric automobile low pressure PTC heating control system.
The technical scheme of the utility model is realized like this: the utility model discloses an electric automobile low pressure PTC heating control system, including singlechip, level conversion circuit, PTC load, the one end of PTC load is connected with the first output of first vehicle-mounted low-voltage power supply, the other end of PTC load is connected with the second output of first vehicle-mounted low-voltage power supply through switch circuit, switch circuit's control end is connected with the first output of singlechip, the first input of singlechip is connected with level conversion circuit's output, level conversion circuit's input and external signal input port are connected.
Further, when the first output terminal of the first vehicle-mounted low-voltage power supply is a positive electrode, the second output terminal of the first vehicle-mounted low-voltage power supply is a negative electrode, and when the first output terminal of the first vehicle-mounted low-voltage power supply is a negative electrode, the second output terminal of the first vehicle-mounted low-voltage power supply is a positive electrode;
furthermore, the external signal input port is connected with the output end of the automobile controller, and the input end of the automobile controller is connected with the instruction input device.
Further, the level conversion circuit comprises a first comparator U1B, a first input end of the first comparator U1B is connected with a reference voltage, a second input end of the first comparator U1B is respectively connected with one end of a resistor R21, one end of a resistor R23 and one end of a resistor R28, the other end of the resistor R21 is connected with a second voltage, the other end of the resistor R23 is grounded, the other end of the resistor R28 is connected with an external signal input port, an output end of the first comparator U1B is respectively connected with one end of a resistor R20 and one end of a resistor R22, the other end of the resistor R20 is connected with a third voltage, and the other end of the resistor R22 is connected with a first input end of the single chip microcomputer.
Further, a first input terminal of the first comparator U1B is connected to an output terminal of the first comparator U1B via a resistor.
Further, a capacitor C19 is connected in series between the first input end and the second input end of the first comparator U1B; the second input end of the first comparator U1B is connected to the negative electrode of the diode ZD1, and the positive electrode of the diode ZD1 is grounded.
Further, a second input end of the first comparator U1B is connected to one end of the capacitor C20, and the other end of the capacitor C20 is grounded; external signal input port is connected with the one end of TVS pipe, and the other end ground connection of TVS pipe.
Further, the level conversion circuit further comprises a second comparator U1A, a first input end of the second comparator U1A is connected with the reference voltage, a second input end of the second comparator U1A is connected with a second output end of the single chip microcomputer through a resistor, and an output end of the second comparator U1A is connected with a second input end of the first comparator U1B.
Further, the level shift circuit further includes a reference circuit for outputting a reference voltage, the reference circuit includes a resistor R9 and a resistor 26, one end of the resistor R9 is connected to the second voltage, the other end of the resistor R9 is connected to one end of the resistor 26, the other end of the resistor 26 is grounded, and a reference voltage output terminal is provided between the resistor R9 and the resistor 26 for outputting the reference voltage.
Further, the switching circuit comprises a switching tube and a switching tube driving circuit, the switching tube is connected in series in a power supply loop of the PTC load, the control end of the switching tube is connected with the output end of the switching tube driving circuit, and the input end of the switching tube driving circuit is connected with the output end of the single chip microcomputer.
Further, the utility model discloses an electric automobile low pressure PTC heating control system still includes current detection circuit, current detection circuit is used for gathering the electric current that the PTC load consumed to transmit for the singlechip.
Further, the utility model discloses an electric automobile low pressure PTC heating control system still includes first voltage detection circuit, and first voltage detection circuit is used for gathering the first voltage of first on-vehicle low-voltage power supply output to transmit for the singlechip.
Further, the utility model discloses an electric automobile low pressure PTC heating control system still includes second on-vehicle low-voltage power supply and constant voltage power supply circuit, the second on-vehicle low-voltage power supply is used for exporting the second voltage and gives level conversion circuit and constant voltage power supply circuit power supply at least, constant voltage power supply circuit is used for receiving the second voltage of second on-vehicle low-voltage power supply output to convert into third voltage output, give level conversion circuit power supply at least.
And the output end of the second vehicle-mounted low-voltage power supply is connected with a power supply protection circuit.
Further, the first voltage output by the first vehicle-mounted low-voltage power supply is 48V; the second voltage output by the second vehicle-mounted low-voltage power supply is 12V; the third voltage output by the voltage-stabilized power supply circuit is 5V.
Further, the utility model discloses an electric automobile low pressure PTC heating control system still includes second voltage detection circuit, second voltage detection circuit is used for gathering the second voltage of second vehicle-mounted low-voltage power supply output to transmit for the singlechip.
Further, an output end of the first vehicle-mounted low-voltage power supply is connected with a first low-voltage filter circuit, and the first low-voltage filter circuit is used for filtering a first voltage output by the first vehicle-mounted low-voltage power supply and outputting the filtered first voltage to the PTC load for power supply.
Furthermore, the output end of the second vehicle-mounted low-voltage power supply is connected with a second low-voltage filter circuit, the power supply protection circuit is located between the output end of the second vehicle-mounted low-voltage power supply and the input end of the second low-voltage filter circuit, and the second low-voltage filter circuit is used for filtering second voltage output by the second vehicle-mounted low-voltage power supply and then outputting the second voltage to at least the level conversion circuit and the voltage-stabilized power supply circuit.
Furthermore, the output end of the voltage-stabilized power supply circuit is connected with a digital power supply filter circuit, and the digital power supply filter circuit is used for filtering the third voltage output by the voltage-stabilized power supply circuit and outputting the filtered third voltage to at least supply power to the level conversion circuit.
Further, when the output terminal of the second vehicle-mounted low-voltage power supply is connected with a second low-voltage filter circuit and a power protection circuit, the power protection circuit is located between the output terminal of the second vehicle-mounted low-voltage power supply and the input terminal of the second low-voltage filter circuit.
Further, the utility model discloses an electric automobile low pressure PTC heating control system still includes temperature detection circuit, temperature detection circuit's output is connected with the fifth input of singlechip.
The utility model discloses following beneficial effect has at least:
the utility model discloses an adopt the PWM control signal that automobile controller sent, at the inside PWM level shift circuit that passes through of heater, give the singlechip with the signal after the conversion, the rethread singlechip gives drive signal to switch tube drive circuit, and drive circuit removes the function that control switch pipe further removed control PTC heating like the MOSFET switch.
The utility model discloses set up low pressure 12V power protection circuit and can realize protecting the reliable and stable of low-voltage electricity, have and prevent joining conversely, antistatic function.
The utility model discloses an integrated linear constant voltage power supply circuit can convert on-vehicle low voltage power supply voltage from 12V to 5V, supplies other each circuit to use.
The utility model discloses an adopt digital power supply filter circuit can the filtering interference signal on the 5V voltage.
The utility model discloses an adopt temperature detection circuit can gather MOSFET, PTC load in real time through the singlechip, PCB's actual temperature, when producing the excess temperature, closes the heating function, guarantees the reliable and stable operation of system.
The utility model discloses a current detection circuit can gather the electric current that the PTC load consumed in real time through MOSFET, and when the electric current that produces was too big or the undersize, the heating function was closed, and the assurance system moves reliably and steadily.
The utility model discloses a voltage detection circuit can gather the voltage of low pressure 12V power and low pressure 48V power in real time, when the voltage is too high or cross low, in time closes the heating function, also can avoid the battery to cross to put and damage when guaranteeing the reliable and stable operation of system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic block diagram of a low-voltage PTC heating control system for an electric vehicle according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a level shift circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of the single chip microcomputer provided by the embodiment of the present invention.
In the reference symbols: 1 is a second vehicle-mounted low-voltage power supply; 2 is a power supply protection circuit; 3 is a second low-voltage filter circuit; 4 is a voltage-stabilized power supply circuit; 5 is a digital power supply filter circuit; 6 is a level conversion circuit; 7 is a program downloading interface circuit; 8 is a singlechip; 9 is a singlechip reset circuit; 10 is a temperature detection circuit; 11. a second voltage detection circuit; 12 is a current detection circuit; 13 is a switch tube driving circuit; 14 is a switch tube; 15 is PTC load; 16 is a first low-voltage filter circuit; 17 is a first voltage detection circuit; 18 is a first vehicle low voltage power supply and 19 is an external signal input port.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
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 to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, the meaning of "a plurality" or "a plurality" is two or more unless otherwise stated.
Example one
Referring to fig. 1 to 3, the embodiment of the utility model provides an electric automobile low pressure PTC heating control system, including singlechip 8, level conversion circuit 6, PTC load 15, the one end of PTC load 15 is connected with first vehicle-mounted low-voltage power supply 18's positive output, the other end of PTC load 15 is connected with first vehicle-mounted low-voltage power supply 18's negative pole output through switch circuit, forms PTC load 15's power supply circuit, switch circuit's control end is connected with singlechip 8's first output, singlechip 8's first input and level conversion circuit 6's output are connected, level conversion circuit 6's input and external signal input port 19 are connected, receive outside control signal through external signal input port 19.
Further, the level shift circuit 6 includes a first comparator U1B, a first input end of the first comparator U1B is connected to the reference voltage, a second input end of the first comparator U1B is respectively connected to one end of a resistor R21, one end of a resistor R23, and one end of a resistor R28, the other end of the resistor R21 is connected to the second voltage, the other end of the resistor R23 is grounded, the other end of the resistor R28 is connected to the external signal input port 19, an output end of the first comparator U1B is respectively connected to one end of a resistor R20 and one end of a resistor R22, the other end of the resistor R20 is connected to the third voltage, and the other end of the resistor R22 is connected to the first input end of the single chip microcomputer 8; a first input terminal of the first comparator U1B is connected to an output terminal of the first comparator U1B via a resistor.
Further, a capacitor C19 is connected in series between the first input end and the second input end of the first comparator U1B; a second input end of the first comparator U1B is connected with a negative electrode of the diode ZD1, and a positive electrode of the diode ZD1 is grounded; a second input end of the first comparator U1B is connected with one end of a capacitor C20, and the other end of the capacitor C20 is grounded; the external signal input port 19 is connected with one end of the TVS tube, and the other end of the TVS tube is grounded;
the level conversion circuit 6 further comprises a second comparator U1A, a first input end of the second comparator U1A is connected with the reference voltage, a second input end of the second comparator U1A is connected with a second output end of the single chip microcomputer 8 through a resistor, and an output end of the second comparator U1A is connected with a second input end of the first comparator U1B;
the level shift circuit 6 further includes a reference circuit for outputting a reference voltage, the reference circuit includes a resistor R9 and a resistor 26, one end of the resistor R9 is connected to the second voltage, the other end of the resistor R9 is connected to one end of the resistor 26, the other end of the resistor 26 is grounded, and a reference voltage output terminal is provided between the resistor R9 and the resistor 26 for outputting the reference voltage.
The second output end of the single chip microcomputer 8 is used for outputting a corresponding signal to the second comparator U1A for diagnosing the circuit, and when the circuit has a fault, the second output end of the single chip microcomputer 8 outputs a high level, and the signal input by the external signal input port 19 is invalid at the moment. The first input end of the first comparator U1B is connected to the output end of the first comparator U1B via a resistor, which can prevent the output signal from oscillating. The diode ZD1 is a voltage stabilizing diode and plays a role of voltage stabilization.
The utility model discloses a PWM level shift circuit's effect does: the PWM control signal sent by the automobile controller is converted into a signal which can be identified by the singlechip 8 and then is output to the singlechip 8, namely, the level signal with 12V high-low change is converted into the level signal with 5V high-low change.
Further, the switching circuit comprises a switching tube 14 and a switching tube driving circuit 13, the switching tube 14 is connected in series in a power supply loop of the PTC load 15, a control end of the switching tube 14 is connected with an output end of the switching tube driving circuit 13, and an input end of the switching tube driving circuit 13 is connected with an output end of the single chip microcomputer 8.
In one embodiment, the switch 14 is a MOSFET.
In one embodiment, referring to fig. 3, the model of the single chip microcomputer is STM8AF6268TC, PB3, PB4, and PB5 thereof are temperature acquisition ports, PB0, PB1, and PB2 thereof are current acquisition ports, PD4 thereof is a PWM acquisition port, and PD1 and NRST thereof are download ports, and the like. The utility model discloses a singlechip not only is limited to STM8AF6268 TC's model, can also be current NXP chip etc..
The model of singlechip 8 is different, and the supply voltage that probably needs is also different, consequently, the utility model discloses can adopt second voltage (12V) to supply power for singlechip 8 as required, also can adopt third voltage (5V) to supply power for singlechip 8.
In one of the embodiments, use the utility model discloses the time, can be with the utility model discloses an external signal input port 19 is connected with automobile controller's output, automobile controller's input and instruction input device are connected, instruction input device is used for receiving the user and needs temperature regulation's instruction to transmit for automobile controller, automobile controller is used for outputting corresponding tempering instruction and gives level conversion circuit 6 through external signal input port 19.
In one of them embodiment, the utility model discloses an electric automobile low pressure PTC heating control system still includes current detection circuit 12, current detection circuit 12 is used for gathering the electric current that PTC load 15 consumed to transmit for singlechip 8. The input end of the current detection circuit 12 is electrically connected with the output end of the switch tube, and the output end of the current detection circuit 12 is connected with the third input end of the single chip microcomputer 8.
The current detection circuit 12 is used for collecting the current consumed by the PTC core body in real time, and when the generated current is too large or too small, the heating function is closed, so that the stable and reliable operation of the system is ensured.
In one of them embodiment, the utility model discloses an electric automobile low pressure PTC heating control system still includes first voltage detection circuit 17, and first voltage detection circuit 17 is used for gathering the first voltage of the output of first on-vehicle low voltage power supply 18 to transmit for singlechip 8.
The input end of the first voltage detection circuit 17 is connected with the output end of the first vehicle-mounted low-voltage power supply 18, and the output end of the first voltage detection circuit 17 is connected with the second input end of the single chip microcomputer 8.
In one embodiment, the utility model discloses an electric automobile low pressure PTC heating control system still includes second on-vehicle low-voltage power supply 1 and constant voltage power supply circuit 4, second on-vehicle low-voltage power supply 1 is used for exporting the second voltage and supplies power for level conversion circuit 6 and constant voltage power supply circuit 4 at least, constant voltage power supply circuit 4 is used for receiving the second voltage of second on-vehicle low-voltage power supply 1 output to convert to the third voltage output, supply power for level conversion circuit 6 at least.
Further, the voltage-stabilized power supply circuit 4 adopts an integrated linear voltage-stabilized power supply circuit 4 for realizing the function of converting 12V into 5V, so that the access level conversion circuit 6 is 5V, and the voltage is convenient to adapt to the driving voltage of the singlechip 8.
In one of them embodiment, the utility model discloses an electric automobile low pressure PTC heating control system still includes second voltage detection circuit 11, second voltage detection circuit 11 is used for gathering the second voltage of second on-vehicle low-voltage power supply 1 output to transmit for singlechip 8.
The input end of the second voltage detection circuit 11 is connected with the output end of the second vehicle-mounted low-voltage power supply 1, and the output end of the second voltage detection circuit 11 is connected with the fourth input end of the single chip microcomputer 8.
In one embodiment, a first low-voltage filter circuit 16 is connected to an output terminal of the first vehicle-mounted low-voltage power supply 18, and the first low-voltage filter circuit 16 is configured to filter a first voltage output by the first vehicle-mounted low-voltage power supply 18 and output the filtered first voltage to the PTC load 15 for power supply. The voltage output by the vehicle-mounted low-voltage 48V power supply can be more stable after interference signals are filtered by the first low-voltage filter circuit 16, namely the low-voltage 48V filter circuit.
In one embodiment, a power protection circuit 2 is connected to an output terminal of the second on-board low-voltage power supply 1.
The output end of the second vehicle-mounted low-voltage power supply is connected with a second low-voltage filter circuit, and the second low-voltage filter circuit 3 is used for filtering the second voltage output by the second vehicle-mounted low-voltage power supply 1 and then outputting the second voltage at least to the level conversion circuit 6 and the regulated power supply circuit 4.
The power protection circuit 2 is located between the output terminal of the second vehicle-mounted low-voltage power supply 1 and the input terminal of the second low-voltage filter circuit 3.
Further, the output end of the regulated power supply circuit 4 is connected to a digital power supply filter circuit 5, and the digital power supply filter circuit 5 is configured to filter and output the third voltage output by the regulated power supply circuit 4, and at least supply power to the level conversion circuit 6.
The first voltage of this embodiment is 48V. The second voltage of this embodiment is 12V. The third voltage of this embodiment is 5V.
In one of them embodiment, the utility model discloses an electric automobile low pressure PTC heating control system still includes temperature detection circuit 10, temperature detection circuit 10's output is connected with the fifth input of singlechip 8. The temperature detection circuit 10 collects the actual temperature of the MOSFET and PTC core bodies and the actual temperature of the PCBA in real time, and when the overtemperature is generated, the heating function is turned off, so that the stable and reliable operation of the system is ensured.
In one embodiment, the single chip microcomputer 8 is further connected with a program downloading interface circuit 7 and a single chip microcomputer reset circuit 9. The singlechip 8 can be used for programming through a program downloading interface; the singlechip reset circuit 9 can ensure the singlechip 8 to run stably, and when abnormal conditions occur, the singlechip reset circuit 9 automatically generates reset time sequence signals. The program downloading interface circuit 7 can realize program programming of the singlechip 8.
The singlechip reset circuit 9 can ensure the singlechip 8 to run stably, and when an abnormal condition occurs, the singlechip reset circuit 9 automatically generates a time sequence signal for resetting the singlechip 8.
The level conversion circuit 6, the program downloading interface circuit 7, the single chip microcomputer reset circuit 9, the temperature detection circuit 10, the current detection circuit 12 and the single chip microcomputer 8 of the present embodiment are all electrically connected with the output end of the digital power supply filter circuit 5, and the filtered 5V voltage is provided through the digital power supply filter circuit 5. The digital power supply filter circuit 5 can filter out interference signals on 5V voltage and then respectively supply power to the single chip microcomputer 8 and the level conversion circuit 6.
In actual operation, referring to fig. 1, the second on-board low-voltage power supply 1 (i.e., the on-board low-voltage 12V power supply) supplies power to the entire on-board low-voltage signal module, and the first on-board low-voltage power supply 18 (i.e., the on-board low-voltage 48V power supply) supplies power to the entire on-board low-voltage power module. When the automobile controller obtains an instruction of needing to adjust the temperature given by people, the automobile controller sends a temperature adjusting instruction to the level conversion circuit 6, the level conversion circuit 6 receives the instruction and then transmits the instruction to the single chip microcomputer 8, the single chip microcomputer 8 transmits a signal to the MOSFET drive circuit after obtaining a heating instruction, the MOSFET drive circuit controls the on and off of the MOSFET, finally, the voltage is transmitted to the PTC load 15, and the PTC load 15 heats, so that the functions of automobile seat heat supply, glass defrosting and the like are realized.
The low-voltage 12V power supply protection circuit 2 can protect the stability and reliability of low voltage electricity, has the functions of reverse connection prevention and static electricity resistance, and the adopted low-voltage 12V filter circuit can filter interference signals on the low voltage electricity and can enable signals obtained by the level conversion circuit 6 to be more stable after being connected into the level conversion circuit 6.
In the system, a second vehicle-mounted low-voltage power supply 1, a low-voltage power supply protection circuit 2, a second low-voltage filter circuit 3, an integrated linear voltage-stabilized power supply circuit 4, a digital power supply filter circuit 5, a program downloading interface circuit 7, a single-chip microcomputer reset circuit 9, a temperature detection circuit 10, a second voltage detection circuit 11, a current detection circuit 12, a switch tube driving circuit 13, a first vehicle-mounted low-voltage power supply 18, a first low-voltage filter circuit 16, a first voltage detection circuit 17 and the like can all adopt the prior art, and the constituent elements and the connection pins thereof can all adopt the prior art.
Example two
In this embodiment, one end of the PTC load 15 is connected to the negative output terminal of the first vehicle-mounted low-voltage power supply 18, and the other end of the PTC load 15 is connected to the positive output terminal of the first vehicle-mounted low-voltage power supply 18 through a switch circuit, so as to form a power supply loop of the PTC load 15. Other technical features of the present embodiment are the same as those of the first embodiment.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an electric automobile low pressure PTC heating control system which characterized in that: the vehicle-mounted low-voltage power supply comprises a single chip microcomputer, a level conversion circuit and a PTC load, wherein one end of the PTC load is connected with a first output end of a first vehicle-mounted low-voltage power supply, the other end of the PTC load is connected with a second output end of the first vehicle-mounted low-voltage power supply through a switch circuit, a control end of the switch circuit is connected with a first output end of the single chip microcomputer, a first input end of the single chip microcomputer is connected with an output end of the level conversion circuit, and an input end of the level conversion circuit is connected with an external signal input port.
2. The low-voltage PTC heating control system for electric vehicles according to claim 1, wherein: the external signal input port is connected with the output end of the automobile controller, and the input end of the automobile controller is connected with the instruction input device.
3. The low-voltage PTC heating control system for electric vehicles according to claim 1, wherein: the level conversion circuit comprises a first comparator U1B, a first input end of the first comparator U1B is connected with reference voltage, a second input end of the first comparator U1B is respectively connected with one end of a resistor R21, one end of a resistor R23 and one end of a resistor R28, the other end of the resistor R21 is connected with second voltage, the other end of the resistor R23 is grounded, the other end of the resistor R28 is connected with an external signal input port, an output end of the first comparator U1B is respectively connected with one end of a resistor R20 and one end of a resistor R22, the other end of the resistor R20 is connected with third voltage, and the other end of the resistor R22 is connected with a first input end of the single chip microcomputer; a first input terminal of the first comparator U1B is connected to an output terminal of the first comparator U1B via a resistor.
4. A low-voltage PTC heating control system for electric vehicles according to claim 3, wherein: a capacitor C19 is connected in series between the first input end and the second input end of the first comparator U1B; a second input end of the first comparator U1B is connected with a negative electrode of the diode ZD1, and a positive electrode of the diode ZD1 is grounded; a second input end of the first comparator U1B is connected with one end of a capacitor C20, and the other end of the capacitor C20 is grounded; the external signal input port is connected with one end of the TVS tube, and the other end of the TVS tube is grounded;
the level conversion circuit further comprises a second comparator U1A, a first input end of the second comparator U1A is connected with the reference voltage, a second input end of the second comparator U1A is connected with a second output end of the single chip microcomputer through a resistor, and an output end of the second comparator U1A is connected with a second input end of the first comparator U1B;
the level shift circuit further comprises a reference circuit used for outputting a reference voltage, the reference circuit comprises a resistor R9 and a resistor 26, one end of the resistor R9 is connected with the second voltage, the other end of the resistor R9 is connected with one end of the resistor 26, the other end of the resistor 26 is grounded, and a reference voltage output end is arranged between the resistor R9 and the resistor 26 and used for outputting the reference voltage.
5. The low-voltage PTC heating control system for electric vehicles according to claim 1, wherein: the switching circuit comprises a switching tube and a switching tube driving circuit, the switching tube is connected in series in a power supply loop of the PTC load, the control end of the switching tube is connected with the output end of the switching tube driving circuit, and the input end of the switching tube driving circuit is connected with the output end of the single chip microcomputer;
when the first output end of the first vehicle-mounted low-voltage power supply is a positive electrode, the second output end of the first vehicle-mounted low-voltage power supply is a negative electrode, and when the first output end of the first vehicle-mounted low-voltage power supply is a negative electrode, the second output end of the first vehicle-mounted low-voltage power supply is a positive electrode;
the PTC load current detection circuit is used for collecting current consumed by the PTC load and transmitting the current to the single chip microcomputer.
6. The low-voltage PTC heating control system for electric vehicles according to claim 1, wherein: the first voltage detection circuit is used for collecting a first voltage output by the first vehicle-mounted low-voltage power supply and transmitting the first voltage to the single chip microcomputer.
7. The low-voltage PTC heating control system for electric vehicles according to claim 1, wherein: the vehicle-mounted low-voltage power supply is used for outputting a second voltage to at least supply power to the level conversion circuit and the voltage-stabilized power supply circuit, and the voltage-stabilized power supply circuit is used for receiving the second voltage output by the second vehicle-mounted low-voltage power supply, converting the second voltage into a third voltage and outputting the third voltage, and supplying power to at least the level conversion circuit;
and the output end of the second vehicle-mounted low-voltage power supply is connected with a power supply protection circuit.
8. The low-voltage PTC heating control system for electric vehicles according to claim 7, wherein: the vehicle-mounted low-voltage power supply further comprises a second voltage detection circuit, wherein the second voltage detection circuit is used for collecting second voltage output by the second vehicle-mounted low-voltage power supply and transmitting the second voltage to the single chip microcomputer.
9. The low-voltage PTC heating control system for electric vehicles according to claim 7, wherein: the output end of the first vehicle-mounted low-voltage power supply is connected with a first low-voltage filter circuit, and the first low-voltage filter circuit is used for filtering a first voltage output by the first vehicle-mounted low-voltage power supply and outputting the filtered first voltage to the PTC load for supplying power;
the output end of the second vehicle-mounted low-voltage power supply is connected with a second low-voltage filter circuit, the power supply protection circuit is positioned between the output end of the second vehicle-mounted low-voltage power supply and the input end of the second low-voltage filter circuit, and the second low-voltage filter circuit is used for filtering second voltage output by the second vehicle-mounted low-voltage power supply and then outputting the second voltage to at least the level conversion circuit and the voltage-stabilized power supply circuit;
the output end of the stabilized voltage supply circuit is connected with a digital power supply filter circuit, and the digital power supply filter circuit is used for filtering and outputting the third voltage output by the stabilized voltage supply circuit and at least supplying power to the level conversion circuit.
10. The low-voltage PTC heating control system for electric vehicles according to claim 1, wherein: the temperature detection circuit is further included, and the output end of the temperature detection circuit is connected with the fifth input end of the single chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222030200.4U CN217969175U (en) | 2022-08-03 | 2022-08-03 | Low-voltage PTC heating control system of electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202222030200.4U CN217969175U (en) | 2022-08-03 | 2022-08-03 | Low-voltage PTC heating control system of electric automobile |
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| CN217969175U true CN217969175U (en) | 2022-12-06 |
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| CN202222030200.4U Active CN217969175U (en) | 2022-08-03 | 2022-08-03 | Low-voltage PTC heating control system of electric automobile |
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