CN115465050A - Gear control circuit of electric automobile air heater - Google Patents

Gear control circuit of electric automobile air heater Download PDF

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Publication number
CN115465050A
CN115465050A CN202210772194.1A CN202210772194A CN115465050A CN 115465050 A CN115465050 A CN 115465050A CN 202210772194 A CN202210772194 A CN 202210772194A CN 115465050 A CN115465050 A CN 115465050A
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CN
China
Prior art keywords
relay
diode
voltage input
input end
power supply
Prior art date
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Pending
Application number
CN202210772194.1A
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Chinese (zh)
Inventor
王坤
李达伦
罗一博
孙雨
王玮
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Xiaogan Huagong Gaoli Electron Co Ltd
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Xiaogan Huagong Gaoli Electron Co Ltd
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Priority to CN202210772194.1A priority Critical patent/CN115465050A/en
Publication of CN115465050A publication Critical patent/CN115465050A/en
Pending legal-status Critical Current

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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
    • B60H1/2225—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters arrangements of electric heaters for heating air
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
    • 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
    • B60H2001/2228—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant controlling the operation of heaters

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

The invention discloses a gear control circuit of an electric automobile air heater, which comprises a plurality of relays, wherein contacts of a first relay and a second relay are respectively connected in series in power supply loops of a first fan and a second fan, one end of a coil of the first relay is connected with a first voltage input end, the other end of the coil of the first relay is grounded, one end of a coil of the second relay is connected with a second voltage input end, the other end of the coil of the second relay is grounded, contacts of a fourth relay and a fifth relay are respectively connected in series in the power supply loops of a first heating element and a second heating element, one end of a coil of the fourth relay is connected with the first voltage input end and the second voltage input end, the other end of the coil of the fourth relay is grounded, one end of a coil of the fifth relay is connected with the second voltage input end, the other end of the coil of the fifth relay is grounded, and the first voltage input end and the second voltage input end are connected with input voltage through a gear control switch. The invention can realize the heating of PTC through the high-voltage battery with low cost, and send out the hot air through the fan, for warming the driver.

Description

Gear control circuit of electric automobile air heater
Technical Field
The invention belongs to the technical field of vehicle air conditioning heating, and particularly relates to a gear control circuit of an electric automobile air heater.
Background
The new energy automobile has become a main topic in the current automobile market, and in the new energy bus, because the new energy bus cannot be warmed by using the waste heat of the engine as the fuel oil bus, a warming scheme suitable for the new energy bus is urgently needed to be designed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a gear control circuit of an electric automobile air heater, which can realize that a PTC is heated by a high-voltage battery at low cost and hot air is sent out by a fan to warm a driver.
The technical scheme of the invention is realized as follows: the invention discloses a gear control circuit of an electric automobile air heater, which comprises a first voltage input end, a second voltage input end, a first heating element, a second heating element, a first fan, a second fan and a plurality of relays, wherein a contact of a first relay K1 is connected in series in a power supply loop of the first fan, one end of a coil of the first relay K1 is connected with the first voltage input end, the other end of the coil is grounded or connected with a power supply negative electrode, a contact of a second relay K2 is connected in series in a power supply loop of the second fan, one end of a coil of the second relay K2 is connected with the second voltage input end, the other end of the coil is grounded or connected with the power supply negative electrode, a contact of a fifth relay K5 is connected in series in a power supply loop of the second heating element, one end of a coil of the fifth relay K5 is connected with the second voltage input end, the other end of the coil of the fourth relay K4 is grounded or connected with the power supply negative electrode, and the first voltage input end of the fifth relay K5 is connected with the gear control input end through a voltage switch.
Furthermore, a seventh diode D7 and an eighth diode D8 are connected in series between one end of the coil of the fifth relay K5 and the second voltage input end; the anode of the eighth diode D8 is connected with the second voltage input end, the cathode of the eighth diode D8 is connected with the anode of the seventh diode D7, and the cathode of the seventh diode D7 is connected with one end of the coil of the fifth relay K5;
a first diode D1 and an eighth diode D8 are connected in series between one end of the coil of the fourth relay K4 and the second voltage input end; the anode of the eighth diode D8 is connected with the second voltage input end, the cathode of the eighth diode D8 is connected with the anode of the first diode D1, the cathode of the first diode D1 is connected with one end of the coil of the fourth relay K4, and a second diode D2 and a ninth diode D9 are connected in series between one end of the coil of the fourth relay K4 and the first voltage input end; the positive pole of the ninth diode D9 is connected with the first voltage input end, the negative pole of the ninth diode D9 is connected with the positive pole of the second diode D2, and the negative pole of the second diode D2 is connected with one end of the coil of the fourth relay K4.
Furthermore, two ends of a coil of each relay are connected with a freewheeling diode in parallel; the anode of the fly-wheel diode is grounded or connected with the cathode of the power supply; and two ends of the coil of each relay are connected with a capacitor in parallel.
Furthermore, the gear control circuit of the electric automobile wind heater further comprises a first TVS tube and a second TVS tube, wherein one end of the first TVS tube is connected with the first voltage input end, the other end of the first TVS tube is grounded or connected with the negative electrode of a power supply, one end of the second TVS tube is connected with the second voltage input end, and the other end of the second TVS tube is grounded or connected with the negative electrode of the power supply.
Further, the electric automobile wind heater gear control circuit further comprises a temperature controller, wherein the temperature controller is used for acquiring the temperature of a heating core body comprising a first heating element and a second heating element, the temperature controller is connected in series with a power supply loop of the fourth relay K4 and a power supply loop of the fifth relay K5, and when the temperature acquired by the temperature controller exceeds a set value, the power supply loop of the fourth relay K4 and the power supply loop of the fifth relay K5 are disconnected.
Furthermore, the gear control circuit of the electric automobile air heater further comprises a third relay K3, a coil of the third relay K3 is connected with a coil of a fourth relay K4 in parallel, and a normally open contact of the third relay K3 is connected in series in a power supply loop of the indicator light; and a temperature controller is connected in series on the power supply loop of the third relay K3 and used for acquiring the temperature of the heating core body comprising the first heating element and the second heating element, and when the temperature acquired by the temperature controller exceeds a set value, the power supply loop of the third relay K3 is disconnected.
Further, one end of the first fan is connected with the first voltage input end through a normally open contact of the first relay K1, the other end of the first fan is grounded or connected with the negative electrode of a power supply, a ninth diode D9 is connected between the normally open contact of the first voltage input end and the normally open contact of the first relay K1 in series, the positive electrode of the ninth diode D9 is connected with the first voltage input end, the negative electrode of the ninth diode D9 is connected with the normally open contact of the first relay K1, one end of the second fan is connected with the second voltage input end through the normally open contact of the second relay K2, the other end of the second fan is grounded or connected with the negative electrode of the power supply, a eighth diode D8 is connected between the normally open contact of the second relay K2 in series, the positive electrode of the eighth diode D8 is connected with the second voltage input end, and the negative electrode of the eighth diode D8 is connected with the normally open contact of the second relay K2.
Furthermore, a voltage divider is connected in series in a power supply loop of the first fan. The cement resistor is used for adjusting the rotating speed of the fan.
Further, the first heating element and the second heating element together constitute a heating core.
Furthermore, the gear control switch is a single-pole double-throw switch, a moving end of the single-pole double-throw switch is connected with the input voltage, a fixed end of the single-pole double-throw switch is connected with the first voltage input end, and the other fixed end of the single-pole double-throw switch is connected with the second voltage input end.
The invention has at least the following beneficial effects: by adopting the scheme, the invention can realize the switching of the input of the control power supply through one single-pole double-throw switch, realize the switching of two gears, does not need a controller and the like, can realize the heating of the PTC through the high-voltage battery at low cost, and can heat a driver by sending hot air through the fan.
The circuit of the invention also has over-temperature protection, and stops working when the temperature of the core body exceeds a set temperature, such as 90 ℃, and recovers working when the temperature of the core body is less than or equal to the set temperature, such as 90 ℃.
The circuit of the invention also has the functions of anti-interference and anti-surge.
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 embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a circuit diagram of a gear control circuit of an electric vehicle wind heater according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, 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 implicitly indicating 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 specified.
Referring to fig. 1, an embodiment of the present invention provides a gear control circuit for an electric vehicle wind heater, including a first voltage input end (i.e., a first voltage input end or a positive power supply end of a connector J1, such as a first input end of + 24V), a second voltage input end (a second voltage input end or a positive power supply end of the connector J1, such as a second input end of + 24V), a first heating element, a second heating element, a first fan, a second fan, and a plurality of relays, wherein a normally open contact of the first relay K1 is connected in series in a power supply circuit of the first fan, one end of a coil of the first relay K1 is connected to the first voltage input end, and the other end is grounded or connected to a negative power supply end (in this embodiment, the ground is connected to a ground pin GND of the connector J1), a normally open contact of the second relay K2 is connected in series in a power supply circuit of the second fan, one end of a coil of the second relay K2 is connected to the second voltage input end, and the other end is grounded or connected to a negative power supply end, a normally open contact of a coil of the fourth relay K4 is connected in series in a power supply circuit of the first heating element, one end of the second relay K4 is connected to the second power supply coil, and the second relay K4 is connected to the second voltage input end, and the second voltage input end or the second voltage input end of the second relay, and the second relay K5 is connected to the second voltage input end, and the second relay K5 is connected to the second relay K5, and the fifth relay K5 is connected to the second relay K5. The two fans are used for blowing out PTC heating air.
One end of the first heating element is connected with a negative electrode HV & lt- & gt of the high-voltage side power supply, the other end of the first heating element is connected with a positive electrode HV & lt- & gt of the high-voltage side power supply through a normally open contact of a fourth relay K4, one end of the second heating element is connected with a negative electrode HV & lt- & gt of the high-voltage side power supply, and the other end of the second heating element is connected with a positive electrode HV & lt- & gt of the high-voltage side power supply through a normally open contact of a fifth relay K5.
Further, a seventh diode D7 and an eighth diode D8 are connected in series between one end of the coil of the fifth relay K5 and the second voltage input end; the anode of the eighth diode D8 is connected with the second voltage input end, the cathode of the eighth diode D8 is connected with the anode of the seventh diode D7, and the cathode of the seventh diode D7 is connected with one end of the coil of the fifth relay K5;
a first diode D1 and an eighth diode D8 are connected in series between one end of the coil of the fourth relay K4 and the second voltage input end; the anode of the eighth diode D8 is connected with the second voltage input end, the cathode of the eighth diode D8 is connected with the anode of the first diode D1, the cathode of the first diode D1 is connected with one end of the coil of the fourth relay K4, and a second diode D2 and a ninth diode D9 are connected in series between one end of the coil of the fourth relay K4 and the first voltage input end; the positive pole of the ninth diode D9 is connected with the first voltage input end, the negative pole of the ninth diode D9 is connected with the positive pole of the second diode D2, and the negative pole of the second diode D2 is connected with one end of the coil of the fourth relay K4.
The ninth diode D9, the eighth diode D8, the seventh diode D7, the second diode D2, and the first diode D1 are used for preventing the reverse connection of the anode and the cathode of the power supply (such as 24V).
Furthermore, two ends of a coil of each relay are connected with a freewheeling diode in parallel; the anode of the fly-wheel diode is grounded or connected with the cathode of the power supply; and two ends of the coil of each relay are connected with a capacitor in parallel. The freewheeling diode is used for absorbing the reverse electromotive force generated when the relay is switched from pull-in to disconnection. For example, a third diode D3 and a first capacitor C1 are connected in parallel at two ends of a coil of the first relay K1. And a fourth diode D4 and a second capacitor C2 are connected in parallel at two ends of a coil of the second relay K2. And a fifth diode D5 and a third capacitor C3 are connected in parallel at two ends of a coil of the third relay K3. The fifth diode D5 and the third capacitor C3 are also connected in parallel across the coil of the fourth relay K4. And a sixth diode D6 and a fourth capacitor C4 are connected in parallel at two ends of a coil of the fifth relay K5.
Furthermore, the gear control circuit of the electric automobile wind heater further comprises a first TVS tube and a second TVS tube, wherein one end of the first TVS tube is connected with the first voltage input end, the other end of the first TVS tube is grounded or connected with the negative electrode of a power supply, one end of the second TVS tube is connected with the second voltage input end, and the other end of the second TVS tube is grounded or connected with the negative electrode of the power supply.
Further, the electric automobile air heater gear control circuit further comprises a temperature controller T1, wherein the temperature controller T1 is used for collecting the temperature of a heating core body comprising a first heating element and a second heating element, the temperature controller is connected in series with a power supply loop of a fourth relay K4 and a power supply loop of a fifth relay K5, and when the temperature collected by the temperature controller exceeds a set value, the power supply loop of the fourth relay K4 and the power supply loop of the fifth relay K5 are disconnected.
The temperature controller is used for protecting the temperature of the core body.
Furthermore, the gear control circuit of the electric automobile wind heater further comprises a third relay K3, a coil of the third relay K3 is connected with a coil of a fourth relay K4 in parallel, and a normally open contact of the third relay K3 is connected in series in a power supply loop of the indicator light; and a temperature controller is connected in series on the power supply loop of the third relay K3 and used for acquiring the temperature of the heating core body comprising the first heating element and the second heating element, and when the temperature acquired by the temperature controller exceeds a set value, the power supply loop of the third relay K3 is disconnected. The both ends of the normally open contact of third relay K3 are connected with pin OUT1, OUT2 of connector J1 respectively, and connector J1 external connection is the last pilot lamp of bus. Pins OUT1, OUT2 of the plug-in J1 are connected in series in the power supply circuit of the indicator light.
And the coil of the first relay K1, the coil of the second relay K2, the coil of the third relay K3, the coil of the fourth relay K4 and the coil of the fifth relay K5 are sequentially electrically connected with the grounding of the connector J1 or the connection power supply negative electrode pin GND. Draw forth a ground connection or connect the power negative pole line from connector J1's ground connection or connection power negative pole pin GND, temperature controller T1 establishes ties on this ground connection or connection power negative pole line, the coil of first relay K1, the coil of second relay K2 and the contact of ground connection or connection power negative pole line connection are located between connector J1 and temperature controller T1 (be located temperature controller T1 and be close to connector J1 one side promptly), the coil of third relay K3, the coil of fourth relay K4, the coil of fifth relay K5 and the contact of ground connection or connection power negative pole line connection are located one side of keeping away from connector J1 of temperature controller T1.
Further, one end of the first fan is connected with the first voltage input end through a normally open contact of the first relay K1, the other end of the first fan is grounded or connected with the negative electrode of a power supply, a ninth diode D9 is connected between the normally open contact of the first voltage input end and the normally open contact of the first relay K1 in series, the positive electrode of the ninth diode D9 is connected with the first voltage input end, the negative electrode of the ninth diode D9 is connected with the normally open contact of the first relay K1, one end of the second fan is connected with the second voltage input end through the normally open contact of the second relay K2, the other end of the second fan is grounded or connected with the negative electrode of the power supply, a eighth diode D8 is connected between the normally open contact of the second relay K2 in series, the positive electrode of the eighth diode D8 is connected with the second voltage input end, and the negative electrode of the eighth diode D8 is connected with the normally open contact of the second relay K2.
Furthermore, a voltage divider is connected in series in a power supply loop of the first fan. The voltage divider of the embodiment adopts a resistor R1 for adjusting the rotation speed of the fan. In this embodiment, the resistor R1 is a cement resistor.
Further, the first heating element and the second heating element together constitute a heating core. The first heating element is a PTC element. The second heating element is a PTC element. The heating core is a PTC core.
Furthermore, the gear control switch is a single-pole double-throw switch, a moving end of the single-pole double-throw switch is connected with the input voltage, a non-moving end of the single-pole double-throw switch is connected with the first voltage input end, and the other non-moving end of the single-pole double-throw switch is connected with the second voltage input end. The control switch of the invention is not limited to a single-pole double-throw switch, and can be replaced by other gear change-over switches with equivalent functions according to requirements.
The low-voltage side power supply voltage of the circuit is 24V, the high-voltage side power supply voltage is 400-640V, and two gear controls are shared. When the low-grade work is carried out, the 1-path high-voltage relay is actuated, the first heating element PTC1, namely the PTC core body half area, is heated, and the speed of the fan is 1 grade. When the high-grade fan works in a high grade, the 2-path high-voltage relay is closed, the first heating element PTC1 and the second heating element PTC2, namely the whole area of the PTC core body, are heated, and the speed of the fan is 2 grades. The circuit has over-temperature protection, stops working when the temperature of the core body exceeds a set temperature such as 90 ℃, and recovers working when the temperature is less than or equal to the set temperature such as 90 ℃, and has the functions of interference resistance and surge prevention.
Low-range equivalent circuit, as shown in fig. 1: (1) Relay K1 closes, relay K2 disconnection, and the fan is established ties with resistance R1 and is constituted bleeder circuit, and the fan is worked under being less than the low pressure input voltage. (2) And the contactor K4 is closed, the contactor K5 is opened, the PTC1 works, and the PTC2 does not work. And (3) the relay K3 is closed, and OUT1 and OUT2 are conducted. (4) The temperature controller T1 is disconnected after the temperature is over-heated, the PTC1 does not work, and an open circuit is formed between OUT1 and OUT 2; and after the temperature of T1 is less than 90 ℃, the conduction is restored, PTC1 is restored to work, and OUT1 and OUT2 are restored to be conducted.
High-grade equivalent circuit: as shown in fig. 1: (1) The relay K1 is disconnected, the relay K2 is closed, low-voltage input voltage is directly applied to two ends of the fan, and the fan works. (2, a contactor K4 is closed, a contactor K5 is closed, a PTC1 works, a PTC2 works, (3) a relay K3 is closed, OUT1 and OUT2 are conducted, (4) a temperature controller T1 is disconnected after being over-heated, the PTC1 and the PTC2 do not work, OUT1 and OUT2 are opened, the conduction is recovered after the temperature of T1 is less than 90 ℃, the PTC1 and the PTC2 recover to work, and the conduction is recovered between OUT1 and OUT 2.
The protective measure circuit comprises (1) high-grade and low-grade low-voltage input ends which are connected with TVS tubes: TVS1 and TVS2 are used for absorbing surge, preventing static electricity, protecting overvoltage and preventing ESD. (2) The two ends of a coil of the contactor are connected with a freewheeling diode: d3 And D4, D5 and D6 are used for absorbing the reverse electromotive force generated when the relay and the contactor are switched from on to off. (3) The temperature controller T1 is connected in series with a working circuit of a low-voltage coil of the contactor, and once the temperature is too high, the temperature controller disconnects the circuit, the contactor is released, the PTC1 and the PTC2 stop working, and damage caused by over-temperature illumination is prevented.
All relays in the invention can be equivalently replaced by switches with equivalent functions of contactors.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims (10)

1. The utility model provides an electric automobile air heater keeps off position control circuit which characterized in that: the fan comprises a first voltage input end, a second voltage input end, a first heating element, a second heating element, a first fan, a second fan and a plurality of relays, wherein a contact of the first relay K1 is connected in series in a power supply loop of the first fan, one end of a coil of the first relay K1 is connected with the first voltage input end, the other end of the coil is grounded or connected with a power supply negative electrode, a contact of the second relay K2 is connected in series in a power supply loop of the second fan, one end of a coil of the second relay K2 is connected with the second voltage input end, the other end of the coil is grounded or connected with the power supply negative electrode, a contact of the fourth relay K4 is connected in series in the power supply loop of the first heating element, one end of a coil of the fourth relay K4 is connected with the second voltage input end, the other end of the coil of the fourth relay K4 is grounded or connected with the power supply negative electrode, a contact of the fifth relay K5 is connected in series in the power supply loop of the second heating element, one end of the coil of the fifth relay K5 is connected with the second voltage input end, and the other end of the first voltage input end and the second voltage input end are connected with an input voltage through a gear control switch.
2. The electric vehicle wind heater gear control circuit of claim 1, wherein: a seventh diode D7 and an eighth diode D8 are connected in series between one end of the coil of the fifth relay K5 and the second voltage input end; the anode of the eighth diode D8 is connected to the second voltage input end, the cathode of the eighth diode D8 is connected to the anode of the seventh diode D7, and the cathode of the seventh diode D7 is connected to one end of the coil of the fifth relay K5;
a first diode D1 and an eighth diode D8 are connected in series between one end of the coil of the fourth relay K4 and the second voltage input end; the anode of the eighth diode D8 is connected with the second voltage input end, the cathode of the eighth diode D8 is connected with the anode of the first diode D1, the cathode of the first diode D1 is connected with one end of the coil of the fourth relay K4, and a second diode D2 and a ninth diode D9 are connected in series between one end of the coil of the fourth relay K4 and the first voltage input end; the positive pole of the ninth diode D9 is connected with the first voltage input end, the negative pole of the ninth diode D9 is connected with the positive pole of the second diode D2, and the negative pole of the second diode D2 is connected with one end of the coil of the fourth relay K4.
3. The electric vehicle wind heater gear control circuit of claim 1, wherein: two ends of the coil of each relay are connected with a freewheeling diode in parallel; the anode of the fly-wheel diode is grounded or connected with the cathode of the power supply; and two ends of the coil of each relay are connected with a capacitor in parallel.
4. The electric vehicle wind heater gear control circuit according to claim 1, characterized in that: still include first TVS pipe and second TVS pipe, the one end and the first voltage input end of first TVS pipe are connected, the other end ground connection or the connection power negative pole of first TVS pipe, and the one end and the second voltage input end of second TVS pipe are connected, and the other end ground connection or the connection power negative pole of second TVS pipe.
5. The electric vehicle wind heater gear control circuit of claim 1, wherein: the temperature controller is used for acquiring the temperature of the heating core body comprising the first heating element and the second heating element, the temperature controller is connected in series with a power supply loop of the fourth relay K4 and a power supply loop of the fifth relay K5, and when the temperature acquired by the temperature controller exceeds a set value, the power supply loop of the fourth relay K4 and the power supply loop of the fifth relay K5 are disconnected.
6. The gear control circuit of the wind heater of the electric automobile according to claim 1 or 5, characterized in that: the power supply circuit also comprises a third relay K3, a coil of the third relay K3 is connected with a coil of a fourth relay K4 in parallel, and a normally open contact of the third relay K3 is connected in series in a power supply loop of the indicator light; and a temperature controller is connected in series on the power supply loop of the third relay K3 and used for acquiring the temperature of the heating core body comprising the first heating element and the second heating element, and when the temperature acquired by the temperature controller exceeds a set value, the power supply loop of the third relay K3 is disconnected.
7. The electric vehicle wind heater gear control circuit according to claim 1, characterized in that: one end of the first fan is connected with a first voltage input end through a normally open contact of a first relay K1, the other end of the first fan is grounded or connected with a power supply cathode to form a power supply loop of the first fan, a ninth diode D9 is connected in series between the normally open contact of the first voltage input end and the normally open contact of the first relay K1, the anode of the ninth diode D9 is connected with the first voltage input end, the cathode of the ninth diode D9 is connected with the normally open contact of the first relay K1, one end of the second fan is connected with a second voltage input end through the normally open contact of a second relay K2, the other end of the second fan is grounded or connected with the power supply cathode to form a power supply loop of the second fan, an eighth diode D8 is connected in series between the normally open contact of the second voltage input end and the normally open contact of the second relay K2, the anode of the eighth diode D8 is connected with the second voltage input end, and the cathode of the eighth diode D8 is connected with the normally open contact of the second relay K2.
8. The gear control circuit of the wind heater of the electric automobile according to claim 1 or 7, characterized in that: a voltage divider is connected in series in a power supply loop of the first fan.
9. The electric vehicle wind heater gear control circuit of claim 1, wherein: the first heating element and the second heating element together form a heating core.
10. The electric vehicle wind heater gear control circuit of claim 1, wherein: the gear control switch is a single-pole double-throw switch, the moving end of the single-pole double-throw switch is connected with input voltage, one fixed end of the single-pole double-throw switch is connected with the first voltage input end, and the other fixed end of the single-pole double-throw switch is connected with the second voltage input end.
CN202210772194.1A 2022-06-30 2022-06-30 Gear control circuit of electric automobile air heater Pending CN115465050A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210772194.1A CN115465050A (en) 2022-06-30 2022-06-30 Gear control circuit of electric automobile air heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210772194.1A CN115465050A (en) 2022-06-30 2022-06-30 Gear control circuit of electric automobile air heater

Publications (1)

Publication Number Publication Date
CN115465050A true CN115465050A (en) 2022-12-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210772194.1A Pending CN115465050A (en) 2022-06-30 2022-06-30 Gear control circuit of electric automobile air heater

Country Status (1)

Country Link
CN (1) CN115465050A (en)

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