Driving loop of heat management controller and electric automobile

Abstract

The utility model provides a driving loop of a heat management controller and an electric automobile, and relates to the technical field of new energy automobiles. A driving loop of the thermal management controller comprises a main chip, a plurality of driving chips and a plurality of feedback resistors. The main chip comprises a plurality of output pins and a plurality of feedback voltage pins; each driving chip comprises an input pin, a first output pin and a second output pin; an output pin of the main chip is connected with an input pin of a driving chip to output a PWM (Pulse-Width Modulation) signal; a first output pin of the driving chip is connected with the thermal management actuator to output load current; a second output pin of the driving chip is connected with a first end of the feedback resistor to output feedback current; the second end of the feedback resistor is grounded; a feedback voltage pin of the main chip is connected with a first end of a feedback resistor to collect a voltage signal of the feedback resistor. According to the scheme of the utility model, the working condition of the thermal management actuator can be identified through the voltage of the feedback resistor, and fault diagnosis is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, in particular to a driving circuit of a thermal management controller and an electric vehicle. Background Art

[0002] The development of electric vehicles today has put forward more stringent requirements for thermal management systems, such as comprehensiveness, intelligence, and precise control. Thermal management controllers must not only cover the traditional air conditioning box motor, but also take into account the temperature control functions of batteries and motors. At the same time, the number of drive circuits of thermal management controllers has increased, and their safety and reliability are also facing higher requirements.

[0003] However, the current thermal management controller drive circuit has carried out fault diagnosis and protection strategy design for thermal management actuators that can feedback working conditions, such as servo motors and blower circuits. For thermal management actuators that cannot feedback working conditions, fault diagnosis is mostly done with the help of sensors. However, relying on sensor-assisted judgment can easily cause damage to thermal management system components and even affect the effectiveness of the vehicle's climate control. Utility Model Content

[0004] The technical solution of the utility model provides a drive circuit of a thermal management controller and an electric vehicle, which are used to solve the problem in the prior art that the thermal management actuator cannot provide feedback on the working condition, relies on sensors to assist in judging the working condition, and is prone to damage to the thermal management system components.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A driving circuit of a thermal management controller is applied to an electric vehicle, wherein the driving circuit of the thermal management controller comprises: a main chip, a plurality of driving chips and a plurality of feedback resistors;

[0007] The main chip includes a plurality of output pins and a plurality of feedback voltage pins;

[0008] Each of the driving chips comprises an input pin, a first output pin and a second output pin;

[0009] Wherein, an output pin of the main chip is connected to an input pin of the driver chip, and a pulse width modulation signal is output to the input pin of the driver chip;

[0010] The first output pin of the driving chip is connected to the thermal management actuator to output a load current to the thermal management actuator;

[0011] The second output pin of the driving chip is connected to the first end of the feedback resistor to output a feedback current to the feedback resistor;

[0012] The second end of each feedback resistor is grounded;

[0013] A feedback voltage pin of the main chip is connected to a first end of the feedback resistor to collect a voltage signal of the feedback resistor.

[0014] Optionally, in the drive circuit of the thermal management controller, the thermal management actuator includes at least one of the following:

[0015] Cooling and heating door motor;

[0016] On-off valve;

[0017] Condensing fan.

[0018] Optionally, in the driving circuit of the thermal management controller, an output pin of the main chip is connected to an input pin of the driving chip through a first resistor.

[0019] Optionally, in the driving circuit of the thermal management controller, a feedback voltage pin of the main chip is connected to a first end of a feedback resistor through a second resistor.

[0020] Optionally, in the driving circuit of the thermal management controller, the power supply voltage pin of the driving chip is respectively connected to the first end of the first capacitor and the first end of the first diode, and the first end of the first capacitor and the first end of the first diode are respectively connected to the battery power supply, and the second end of the first capacitor and the second end of the first diode are grounded.

[0021] Optionally, in the driving circuit of the thermal management controller, a power supply voltage pin of the driving chip is connected to the first end of the first capacitor and the first end of the first diode respectively through a second diode.

[0022] Optionally, in the driving circuit of the thermal management controller, the first output pin of the driving chip is respectively connected to the first end of the second capacitor and the first end of the third diode, and the second end of the second capacitor and the second end of the third diode are grounded.

[0023] An electric vehicle comprises a drive circuit of a thermal management controller as described in any one of the above items.

[0024] The beneficial effects of the utility model are:

[0025] In the above technical solution, the driving circuit of the thermal management controller includes: a main chip, multiple driving chips and multiple feedback resistors; the main chip includes multiple output pins and multiple feedback voltage pins; each of the driving chips includes an input pin, a first output pin and a second output pin; wherein, one output pin of the main chip is connected to an input pin of the driving chip, and a pulse width modulation signal is output to the input pin of the driving chip; the first output pin of the driving chip is connected to the thermal management actuator, and a load current is output to the thermal management actuator; the second output pin of the driving chip is connected to the first end of the feedback resistor, and a feedback current is output to the feedback resistor; the second end of each feedback resistor is grounded; one feedback voltage pin of the main chip is connected to the first end of the feedback resistor, and the voltage signal of the feedback resistor is collected. In this way, the main chip can identify the working condition of the thermal management actuator through the voltage of the feedback resistor, realize fault diagnosis, and greatly improve the stability of the thermal management system of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram showing a drive circuit of a thermal management controller according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The utility model aims at the problem that the thermal management actuator in the prior art cannot feedback the working condition and relies on sensors to assist in judging the working condition, which easily causes damage to the thermal management system components. The utility model provides a drive circuit of a thermal management controller and an electric vehicle.

[0029] An embodiment of the utility model provides a driving circuit of a thermal management controller, which is applied to an electric vehicle. The driving circuit of the thermal management controller includes: a main chip, a plurality of driving chips and a plurality of feedback resistors;

[0030] It should be noted that one driver chip corresponds to one feedback resistor. Therefore, the number of driver chips is consistent with the number of feedback resistors. Figure 1 As shown, a driving chip is taken as an example to illustrate the circuit structure of the driving circuit of the thermal management controller.

[0031] The main chip includes a plurality of output pins and a plurality of feedback voltage pins;

[0032] In the embodiment of the utility model, the driving chip can be an intelligent driving chip, for example, an intelligent driving chip of model BTS6163D, each of the driving chips includes an input pin, a first output pin and a second output pin;

[0033] It should be noted that Figure 1 The output pin of the main chip is represented by OUT, and the feedback voltage pin is represented by FB; the input pin of the driving chip is represented by IN, the first output pin is represented by OUT, and the second output pin is represented by IS; the feedback resistor is represented by R_FB.

[0034] Wherein, an output pin of the main chip is connected to an input pin of the driver chip, and a PWM (Pulse Width Modulation) signal is output to the input pin of the driver chip;

[0035] The first output pin of the driving chip is connected to the thermal management actuator ( Figure 1 DRIVE is used to represent a thermal management actuator) to output a load current to the thermal management actuator;

[0036] The second output pin of the driving chip is connected to the first end of the feedback resistor to output a feedback current to the feedback resistor;

[0037] The second end of each feedback resistor is grounded;

[0038] A feedback voltage pin of the main chip is connected to a first end of the feedback resistor to collect a voltage signal of the feedback resistor.

[0039] In an embodiment of the utility model, the ratio of the feedback current to the load current is a preset value. The pulse width modulation signal output by the output pin of the main chip to the input pin of the driver chip is known, and the current value of the load current output by the first output pin of the driver chip when the thermal management actuator is in a normal working state can be obtained, thereby obtaining the current value of the feedback current. Furthermore, the resistance value and current value of the feedback resistor are known, and the voltage of the feedback resistor when the thermal management actuator is in a normal working state can be obtained, which is referred to as the feedback voltage here.

[0040] It can be understood that the feedback voltage pin of the main chip collects the voltage signal of the feedback resistor, and obtains the voltage value of the feedback resistor through the analog-to-digital conversion device in the main chip, so that according to the voltage value of the feedback resistor, it can be detected whether the thermal management actuator is in a normal working state to achieve fault diagnosis.

[0041] Exemplarily, it is known that the current value of the load current ranges from 4.5A to 7.5A, the current value of the feedback current ranges from 0.5mA to 0.83mA, and the resistance value of the feedback resistor is 0.68kΩ. Then, the voltage value of the feedback resistor collected by the feedback voltage pin of the main chip includes the following three cases:

[0042] When the thermal management actuator is in a normal working state, the voltage value of the feedback resistor collected by the feedback voltage pin of the main chip should be in the range of 0.34V to 0.56V;

[0043] When the thermal management actuator is in an open circuit fault, the current value of the feedback current output by the second output pin of the driver chip is 0, that is, there is no feedback current output, so the voltage value of the feedback resistor collected by the feedback voltage pin of the main chip is 0;

[0044] When the thermal management actuator is in a short circuit fault, the current value of the feedback current output by the second output pin of the driver chip is equal to the fault current value, and the fault current value ranges from 4mA to 7.5mA. Therefore, the minimum voltage value of the feedback resistor collected by the feedback voltage pin of the main chip is 2.72V.

[0045] Furthermore, when the thermal management actuator is in an open circuit or short circuit fault, the system protection can be started in time and reported to the whole vehicle to ensure the normal operation of the whole vehicle.

[0046] As an optional embodiment, the thermal management actuator includes at least one of the following:

[0047] Cooling and heating door motor;

[0048] On-off valve;

[0049] Condensing fan.

[0050] In the embodiment of the utility model, the heating and cooling air door motor, the on-off valve and the condensing fan are one-way drive type thermal management actuators, which cannot provide feedback on the working status to the thermal management controller. By adopting the drive circuit of the thermal management controller described in the embodiment of the utility model, the thermal management controller can identify the working status of the thermal management actuator and implement fault diagnosis by collecting the voltage signal of the feedback resistor.

[0051] By adopting the driving circuit of the thermal management controller described in the embodiment of the utility model, when the heating and cooling air door motor fails, it can accurately identify and issue a fault alarm to avoid the heater blocking causing the PTC (Positive Temperature Coefficient) to overheat and dry out.

[0052] By adopting the drive circuit of the thermal management controller described in the embodiment of the utility model, when the on-off valve fails, it can be identified in time, thereby shutting down the compressor or opening other refrigeration circuits to avoid excessive pressure in the compressor, which may cause damage and shorten the service life.

[0053] The drive circuit of the thermal management controller described in the embodiment of the utility model can accurately identify when the condensing fan fails, thereby shutting down the compressor in time and reporting the fault, avoiding excessive pipeline pressure affecting the cooling state of the entire vehicle, and facilitating timely vehicle maintenance and maintaining system performance.

[0054] As an optional embodiment, an output pin of the main chip is connected to an input pin of the driving chip through a first resistor.

[0055] In the embodiment of the utility model, Figure 1 As shown, the first resistor is represented by R1. The first resistor is used to play an isolation role to ensure circuit safety.

[0056] As an optional embodiment, a feedback voltage pin of the main chip is connected to a first end of a feedback resistor through a second resistor.

[0057] In the embodiment of the utility model, Figure 1 As shown, the first resistor is represented by R2. The second resistor can also play an isolation role to ensure the safety of the feedback voltage pin of the main chip and the circuit where the feedback resistor is located.

[0058] As an optional embodiment, the power supply voltage pin of the driving chip is respectively connected to the first end of the first capacitor and the first end of the first diode, and the first end of the first capacitor and the first end of the first diode are respectively connected to the battery power supply, and the second end of the first capacitor and the second end of the first diode are grounded.

[0059] It should be noted that Figure 1 The power supply voltage pin of the driver chip is represented by VBB, the first capacitor is represented by C1, and the first diode is represented by Q1. The first diode is a TVS (Transient Voltage Suppressor), which can protect the driver chip and the battery power supply from voltage spikes introduced by the wires, thereby protecting the device safety. Moreover, the first capacitor and the first diode are connected in parallel to play the role of electromagnetic compatibility.

[0060] Figure 1 The battery power source is represented by V_BAT, and the battery power source can supply power to the driving chip.

[0061] As an optional embodiment, the power supply voltage pin of the driving chip is connected to the first end of the first capacitor and the first end of the first diode respectively through a second diode.

[0062] In the embodiment of the utility model, Figure 1 The second diode is represented by Q2. The second diode is used on the basis of the first capacitor and the first diode to further ensure that the device is not damaged by voltage spikes.

[0063] As an optional embodiment, the first output pin of the driving chip is connected to the first end of the second capacitor and the first end of the third diode respectively, and the second end of the second capacitor and the second end of the third diode are grounded.

[0064] In the embodiment of the utility model, Figure 1 As shown, the second capacitor is represented by C2, and the third diode is represented by Q3. The second capacitor and the third diode are connected in parallel to achieve electromagnetic compatibility.

[0065] In summary, by adopting the drive circuit of the thermal management controller described in the embodiment of the utility model, for the thermal management actuator that cannot provide feedback on the working condition, by setting a drive chip in the drive circuit of the thermal management controller, the thermal management controller can detect the load current of the thermal management actuator, thereby identifying the working condition of the thermal management actuator and realizing fault diagnosis. When the working condition is a short circuit, an alarm is issued and the drive signal is cut off when the working condition is a short circuit, thereby protecting the drive circuit and the load and greatly improving the stability of the thermal management system of the whole vehicle.

[0066] The electric vehicle provided by the embodiment of the utility model includes the drive circuit of the thermal management controller as described above. All embodiments of the drive circuit of the thermal management controller are applicable to the electric vehicle and can achieve the same or similar beneficial effects, which will not be described in detail here.

[0067] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications are also within the protection scope of the present invention.

Claims

1. A drive circuit of a thermal management controller, characterized in that: Applied to electric vehicles, the driving circuit of the thermal management controller includes: a main chip, multiple driving chips and multiple feedback resistors; The main chip includes a plurality of output pins and a plurality of feedback voltage pins; Each of the driving chips comprises an input pin, a first output pin and a second output pin; Wherein, an output pin of the main chip is connected to an input pin of the driver chip, and a pulse width modulation signal is output to the input pin of the driver chip; The first output pin of the driving chip is connected to the thermal management actuator to output a load current to the thermal management actuator; The second output pin of the driving chip is connected to the first end of the feedback resistor to output a feedback current to the feedback resistor; The second end of each feedback resistor is grounded; A feedback voltage pin of the main chip is connected to a first end of the feedback resistor to collect a voltage signal of the feedback resistor.

2. The driving circuit of the thermal management controller according to claim 1, characterized in that: The thermal management actuator includes at least one of the following: Cooling and heating door motor; On-off valve; Condensing fan.

3. The driving circuit of the thermal management controller according to claim 1, characterized in that: An output pin of the main chip is connected to an input pin of the driving chip through a first resistor.

4. The driving circuit of the thermal management controller according to claim 1, characterized in that: A feedback voltage pin of the main chip is connected to a first end of a feedback resistor through a second resistor.

5. The driving circuit of the thermal management controller according to claim 1, characterized in that: The power supply voltage pin of the driving chip is respectively connected to the first end of the first capacitor and the first end of the first diode, and the first end of the first capacitor and the first end of the first diode are respectively connected to the battery power supply, and the second end of the first capacitor and the second end of the first diode are grounded.

6. The driving circuit of the thermal management controller according to claim 5, characterized in that: The power supply voltage pin of the driving chip is respectively connected to the first end of the first capacitor and the first end of the first diode through a second diode.

7. The driving circuit of the thermal management controller according to claim 1, characterized in that: The first output pin of the driving chip is connected to the first end of the second capacitor and the first end of the third diode respectively, and the second end of the second capacitor and the second end of the third diode are grounded.

8. An electric vehicle, characterized in that: A drive circuit comprising the thermal management controller according to any one of claims 1 to 7.

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