CN217863627U

CN217863627U - Gear control circuit of electric automobile air heater

Info

Publication number: CN217863627U
Application number: CN202221697828.3U
Authority: CN
Inventors: 王坤; 李达伦; 罗一博; 孙雨; 王玮
Original assignee: Xiaogan Huagong Gaoli Electron Co Ltd
Current assignee: Xiaogan Huagong Gaoli Electron Co Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-11-22
Anticipated expiration: 2032-06-30

Abstract

The utility model discloses an electric automobile air heater keeps off position control circuit, including a plurality of relays, first relay, the contact of second relay is established ties respectively at first fan, in the power supply loop of second fan, the coil one end and the first voltage input end of first relay are connected, other end ground connection, the coil one end and the second voltage input end of second relay are connected, other end ground connection, the fourth relay, the contact of fifth relay is established ties respectively at first heating element, in the power supply loop of second heating element, the one end and the first voltage input end of fourth relay coil, second voltage input end all is connected, other end ground connection, the one end and the second voltage input end of fifth relay coil are connected, other end ground connection, first voltage input end, second voltage input end is connected with input voltage through keeping off position control switch. The utility model discloses can realize giving the PTC heating through high-voltage battery with the low cost, send out hot-blastly through the fan, give the driver heating.

Description

Gear control circuit of electric automobile air heater

Technical Field

The utility model belongs to the technical field of vehicle air conditioner heating, concretely relates to electric automobile air heater keeps off position control circuit.

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.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide an electric automobile air heater keeps off position control circuit, the utility model discloses can realize giving the PTC heating through high voltage battery with the low cost, see off hot-blastly through the fan, keep warm for the driver.

The technical scheme of the utility model is realized like this: the utility model discloses an electric automobile air heater keeps off position control circuit, including first voltage input end, second voltage input end, first heating element, second heating element, first fan, second fan and a plurality of relay, wherein, first relay K1's contact is established ties in the power supply loop of first fan, first relay K1's coil one end is connected with first voltage input end, other end ground connection or connection power negative pole, and second relay K2's contact is established ties in the power supply loop of second fan, second relay K2's coil one end is connected with second voltage input end, and other end ground connection or connection power negative pole, fourth relay K4's contact are established ties in first heating element's power supply loop, and the one end of fourth relay K4 coil all is connected with first voltage input end, second voltage input end, and other end ground connection or connection power negative pole, and fifth relay K5's contact is established ties in second heating element's power supply loop, and the one end of fifth relay K5 coil is connected with second voltage input end, and other end ground connection power negative pole, first relay K5 coil's contact is connected with second voltage input end, second voltage input end and second voltage input end are connected with the fender position control voltage input end.

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.

Further, the utility model discloses an electric automobile wind heater keeps off position control circuit still includes first TVS pipe and second TVS pipe, and the one end and the first voltage input 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 of second TVS pipe are connected, the other end ground connection or the connection power negative pole of second TVS pipe.

Further, the utility model discloses an electric automobile air heater keeps off position control circuit still includes the temperature controller, the temperature controller is used for gathering the temperature that contains first heating element and second heating element's heating core, the temperature controller is established ties at fourth relay K4's power supply loop and fifth relay K5's power supply loop, and when the temperature that the temperature controller gathered exceeded the setting value, disconnection fourth relay K4's power supply loop and fifth relay K5's power supply loop.

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 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 utility model discloses following beneficial effect has at least: the utility model adopts the above technical scheme make the utility model discloses can realize the switching of control power input through a single-pole double-throw switch, realize two fender position switches, need not controller etc. can realize through high voltage battery with the low cost and give the PTC heating, see off hot-blastly through the fan, keep warm for the driver.

Just the utility model discloses a circuit still has excess temperature protection, and when the core temperature exceeded the settlement temperature stop work when 90 ℃, be less than or equal to the settlement temperature resume work when 90 ℃.

The utility model discloses a circuit still has anti-interference, anti-surge function.

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 circuit diagram of a gear control circuit of an electric vehicle wind heater provided by the embodiment of the present invention.

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 in 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 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 stated.

Referring to fig. 1, an embodiment of the present invention provides a gear control circuit for an electric vehicle air 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 a 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 loop 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 (the ground of this embodiment 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 loop 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 the fourth relay K4 is connected in series in a power supply loop, one end of the normally open contact of the fourth relay K4 is connected to the power supply loop, one end of the second relay K4 is connected to the second power supply loop, and the second relay K5 is connected to the second voltage input end, and the second voltage input end is connected to the second voltage input end, and the second relay K5, the fifth relay is connected to the second relay K1, and the second relay K5, the fifth relay K5, and the fifth relay K5, the fifth relay 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;

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 positive and negative electrodes of the power supply (e.g., 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. A fifth diode D5 and a 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.

Further, the utility model discloses an electric automobile air heater keeps off position control circuit still includes temperature controller T1, temperature controller T1 is used for gathering the temperature that contains first heating element and second heating element's heating core, the temperature controller is established ties at fourth relay K4's power supply circuit and fifth relay K5's power supply circuit, and when the temperature that the temperature controller was gathered exceeded the setting value, disconnection fourth relay K4's power supply circuit and fifth relay K5's power supply circuit.

The temperature controller is used for protecting the temperature of the core body.

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. 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.

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 utility model discloses a control switch not only is limited to the single-pole double-throw switch, can also change into the fender position change over switch of other equivalent functions as required.

The utility model discloses a circuit low-voltage side supply voltage is 24V, and high-pressure side supply voltage is 400-640V, and total two keep off position control. 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 works again, and the conduction is restored between OUT1 and OUT 2.

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 relay, the contactor coil both ends access freewheeling diode: d3 And D4, D5 and D6, which are used for absorbing the reverse electromotive force generated from the closing to the opening of the relay and the contactor. (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.

The utility model discloses in all relays all can be the equivalent switch of replacing into functions such as contactor is equal.

The above description is only for the 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

1. The utility model provides an electric automobile wind 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 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 negative electrode, a contact of the fourth relay K4 is connected in series in a 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 negative electrode, a contact of the fifth relay K5 is connected in series in a 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, the other end of the coil is grounded or connected with the power negative electrode, and the first voltage input end and the second voltage input end of the first voltage input end of the second relay K1 are connected with an input end 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 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;

3. The electric vehicle wind heater gear control circuit according to claim 1, characterized in that: 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 of claim 1, wherein: 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 of first TVS pipe or connect the power negative pole, the one end and the second voltage input end of second TVS pipe are connected, the other end ground connection of second TVS pipe or connect the power negative pole.

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, wherein 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 lamp; 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.