Dual-temperature control device for PTC heater of manual air conditioner of new energy automobile

Abstract

The utility model relates to a new energy automobile manual air conditioner PTC heater double temperature control device, which comprises a PTC heater body and a PTC temperature controller, the PTC temperature controller comprises a mechanical temperature control device and an NTC temperature sensor, the PTC heater body is connected with a high-voltage connector and a low-voltage connector, the high-voltage connector is connected with a high-voltage power supply through a relay, and the low-voltage connector is connected with a low-voltage power supply through a relay. The input ends of the mechanical temperature control device and the NTC temperature sensor are connected with a low-voltage power supply through a low-voltage connector, and the output end of the mechanical temperature control device connected in series with the NTC temperature sensor is connected with the control end of the relay. Double temperature control is adopted, either the NTC temperature sensor or the mechanical temperature control device can control on-off of the PTC heater, the risk that the PTC heater is out of control due to failure of the mechanical temperature control device can be effectively prevented, the service life of the mechanical temperature control device is prolonged due to the fact that the use frequency of the NTC temperature sensor is higher than that of the mechanical temperature control device, the structure is simple, and cost is low. And the method has universality.

Description

Technical Field

[0001] This utility model relates to the field of automotive air conditioning control technology, specifically a dual-temperature control device for a PTC heater in a manual air conditioning system for new energy vehicles. Background Technology

[0002] In recent years, with the increasing popularity of electric vehicles, a typical temperature-sensitive semiconductor resistor (PTC) has received more and more attention due to its special heating characteristics (temperature step), and is widely used in the heating process of electric vehicles.

[0003] Existing PTC temperature controllers only provide mechanical temperature control protection to prevent PTC heaters from dry burning, which is a self-protection measure under extreme industrial control conditions. For example, the authorized announcement number CN205736979U, "Two-stage safety protection device for auxiliary heating device of air conditioning in new energy electric buses," discloses a safety protection device that protects the PTC heater through a primary metal sheet temperature controller and a secondary metal sheet temperature controller; the application publication number CN109780637A, "A heating component, electric heating device and ceiling machine," discloses mechanical temperature control protection for the PTC heater through a temperature controller and a first fuse. Since the lifespan of mechanical temperature control protection facilities is only about 10,000 cycles, they can easily reach the limit and fail, thus causing the safety hazard of PTC heater dry burning. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a dual temperature control device for the PTC heater of the manual air conditioner in new energy vehicles, so as to solve the problems of short service life and easy dry burning of the PTC heater in the existing mechanical temperature control protection facilities.

[0005] The technical solution to the above-mentioned technical problems is: a dual-temperature control device for a manual air conditioning PTC heater in a new energy vehicle, comprising a PTC heater body and a PTC temperature controller disposed inside the PTC heater body, wherein the PTC temperature controller includes a mechanical temperature control device; characterized in that: the PTC temperature controller further includes at least one NTC temperature sensor connected in series with the mechanical temperature control device, the PTC heater body is connected to a high-voltage connector and a low-voltage connector, the high-voltage connector is connected to a high-voltage power supply through a relay, the input terminals of the mechanical temperature control device and the NTC temperature sensor are respectively connected to a low-voltage power supply through the low-voltage connector, and the output terminal of the mechanical temperature control device and the NTC temperature sensor connected in series is connected to the control terminal of the relay.

[0006] A further technical solution of this utility model is: the mechanical temperature control device is located on the lower inner side of the PTC heater body; the NTC temperature sensor is located on the upper inner side of the PTC heater body.

[0007] A further technical solution of this utility model is as follows: one end of the mechanical temperature control device is connected to the positive terminal of the low-voltage power supply, the other end of the mechanical temperature control device is connected to the VCC pin of the NTC temperature sensor, the GND pin of the NTC temperature sensor is connected to the negative terminal of the low-voltage power supply, the two pins of the relay control terminal are respectively connected to the output terminal of the NTC temperature sensor and the negative terminal of the low-voltage power supply, and the two pins of the relay output terminal are respectively connected to the positive terminal of the high-voltage power supply and the high-voltage positive terminal connector of the PTC heater body to control the input of high-voltage electricity.

[0008] This utility model provides a dual-temperature control device for a PTC heater in a manual air conditioner for new energy vehicles. Due to the above-mentioned structure, it has the following beneficial effects:

[0009] 1. Reduce safety hazards of PTC heaters

[0010] This invention employs dual temperature control, namely, adding an NTC temperature sensor to the existing PTC temperature controller. The PTC temperature controller switches the PTC heater on and off based on the resistance change of the NTC temperature sensor. The NTC temperature sensor is connected in series with the existing mechanical temperature control device. The on / off state of either the NTC temperature sensor or the mechanical temperature control device can send a signal to the vehicle's electrical system, thereby achieving the purpose of switching the PTC heater on and off. This effectively prevents the PTC heater from going out of control due to the failure of the mechanical temperature control device after reaching its lifespan, reducing the safety hazards such as fires caused by the dry burning of the PTC heater in the vehicle.

[0011] 2. Extend the service life of mechanical temperature control devices.

[0012] Since the temperature controlled by the NTC temperature sensor is lower than that of the mechanical temperature control device, the NTC temperature sensor is used more frequently than the mechanical temperature control device, thereby extending the service life of the mechanical temperature control device and thus extending the service life of the PTC heater.

[0013] 3. Simple structure, good performance, and easy to promote and use.

[0014] This invention adds an NTC temperature sensor to the original PTC thermostat. Therefore, the structure of this invention is simple and does not require major modifications to the original structure. It maximizes the safety and reliability of the PTC heater and effectively avoids dry burning. It is universally applicable to air conditioning in new energy vehicles, has low cost, and is easy to promote and use.

[0015] The following description, in conjunction with the accompanying drawings and embodiments, further illustrates the present invention of a dual-temperature control device for a manual air conditioning PTC heater in a new energy vehicle. Attached Figure Description

[0016] Figure 1This utility model discloses a structural schematic diagram of a dual-temperature control device for a PTC heater in a manual air conditioner for new energy vehicles.

[0017] Figure 2 This utility model discloses a circuit diagram of a dual temperature control device for a PTC heater in a manual air conditioner for new energy vehicles.

[0018] In the diagram: 1-PTC heater body, 11-high voltage connector, 12-low voltage connector, 2-NTC temperature sensor, 3-mechanical temperature control device, 4-electrical relay. Detailed Implementation

[0019] like Figure 1 As shown, this utility model discloses a dual-temperature control device for a manual air conditioning PTC heater in a new energy vehicle. It includes a PTC heater body 1 and a PTC temperature controller disposed inside the PTC heater body 1. The PTC temperature controller includes a mechanical temperature control device 3; the PTC temperature controller also includes at least one NTC temperature sensor connected in series with the mechanical temperature control device 3. The mechanical temperature control device 3 is disposed on the lower inner side of the PTC heater body 1; the NTC temperature sensor 2 is disposed on the upper inner side of the PTC heater body 1. By employing dual temperature control, the on / off state of either the NTC temperature sensor or the mechanical temperature control device can send a signal to the vehicle's electrical system, achieving the purpose of switching the PTC heater on and off. This effectively prevents the risk of the PTC heater malfunctioning due to the failure of the mechanical temperature control device after reaching its lifespan.

[0020] The PTC heater body 1 is connected to a high-voltage connector 11 and a low-voltage connector 12. The high-voltage connector 11 is connected to a high-voltage power supply through a relay 4. The input terminals of the mechanical temperature control device 3 and the NTC temperature sensor are respectively connected to a low-voltage power supply through the low-voltage connector 12. The output terminal of the mechanical temperature control device 3 and the NTC temperature sensor connected in series is connected to the control terminal of the relay 4.

[0021] Specifically, one end of the mechanical temperature control device 3 is connected to the positive terminal of the low-voltage power supply, and the other end of the mechanical temperature control device 3 is connected to the VCC pin of the NTC temperature sensor 2. The GND pin of the NTC temperature sensor 2 is connected to the negative terminal of the low-voltage power supply. The two pins of the control terminal of the relay 4 are respectively connected to the output terminal of the NTC temperature sensor 2 and the negative terminal of the low-voltage power supply. The two pins of the output terminal of the relay 4 are respectively connected to the positive terminal of the high-voltage power supply and the high-voltage positive terminal connector of the PTC heater body 1 to control the input of high-voltage electricity.

[0022] The working principle of this utility model:

[0023] The PTC temperature controller of this invention consists of a mechanical temperature control device 3 and an NTC temperature sensor 2. The NTC temperature sensor 2 switches the PTC heater on and off by changing its resistance. Since the mechanical temperature control device 3 and the NTC temperature sensor 2 are connected in series, the switching on or off of either one can achieve the purpose of switching the PTC heater on and off, which can effectively prevent the risk of the PTC heater going out of control due to the failure of the mechanical temperature control device after reaching its lifespan. At the same time, because the temperature controlled by the NTC temperature sensor is lower than that controlled by the mechanical temperature control device, the NTC temperature sensor is used more frequently than the mechanical temperature control device, thereby increasing the service life of the mechanical temperature control device and thus increasing the service life of the PTC heater.

[0024] The above embodiments are merely preferred embodiments of this utility model. The structure of this utility model is not limited to the forms listed in the above embodiments. Any modifications, equivalent substitutions, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A new energy vehicle manual air conditioner PTC heater dual temperature control device, comprising a PTC heater body (1) and a PTC thermostat arranged inside the PTC heater body (1), wherein the PTC thermostat comprises a mechanical temperature control device (3); the characteristics are: The PTC temperature controller further comprises at least one NTC temperature sensor (2) connected in series with the mechanical temperature control device (3); the PTC heater body (1) is connected to a high-voltage connector (11) and a low-voltage connector (12); the high-voltage connector (11) is connected to a high-voltage power supply via a relay (4); the input ends of the mechanical temperature control device (3) and the NTC temperature sensor (2) are respectively connected to a low-voltage power supply via a low-voltage connector (12); and the output end of the mechanical temperature control device (3) and the NTC temperature sensor (2) connected in series is connected to a control end of the relay (4).

2. A new energy vehicle manual air conditioner PTC heater dual temperature control device according to claim 1, characterized in that: The mechanical temperature control device (3) is arranged on the lower inner side of the PTC heater body (1); and the NTC temperature sensor (2) is arranged on the upper inner side of the PTC heater body (1).

3. A new energy vehicle manual air conditioner PTC heater dual temperature control device according to claim 1, characterized in that: One end of the mechanical temperature control device (3) is connected to the positive electrode of the low-voltage power supply, the other end of the mechanical temperature control device (3) is connected to the VCC pin of the NTC temperature sensor (2), the GND pin of the NTC temperature sensor (2) is connected to the negative electrode of the low-voltage power supply, two pins of the control end of the relay (4) are respectively connected to the output end of the NTC temperature sensor (2) and the negative electrode of the low-voltage power supply, and two pins of the output end of the relay (4) are respectively connected to the positive electrode of the high-voltage power supply and the high-voltage positive connector of the PTC heater body (1), thereby controlling the input of high-voltage electricity.

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