TEMPERATURE CONTROL PROTECTION DEVICE AND CORRESPONDING CHARGING DEVICE

Abstract

A temperature control protection device and a corresponding face device. The temperature control protection device includes: a temperature acquisition unit (101); a comparison unit (102) configured to compare an ambient temperature signal with a preset reference voltage and output a first comparison result; a control unit (103) configured to compare the ambient temperature signal with a preset threshold and output a second comparison result; a drive unit (104) configured to output a drive signal to a switching unit (105) according to the first or second comparison result to turn the switching unit (105) on or off; and the switching unit (105) configured to output the load current when it is being driven.The temperature control protection device and the charging device with it, according to the modalities of the present description, perform multiple temperature monitoring protections during charging and improve charging safety.

Description

A temperature control protection device and corresponding charging device

[0001] This application claims priority to the Chinese patent filed on November 6, 2020, with application number 202022550192.7 and invention name “A temperature control protection device and corresponding charging device”. All contents of the patent are incorporated herein. Technical Field

[0002] This article relates to the field of charging technology, and in particular to a temperature control protection device and a corresponding charging device. Background Art

[0003] In the current global and Chinese markets, new energy vehicles are being promoted and popularized, with their ownership increasing significantly year by year. As the number of new energy vehicles increases, the number of chargers for charging new energy vehicles is also increasing sharply.

[0004] With the development of power supply technology and the popularization of electric vehicles, the safety of electricity use has become a common concern for users. Currently, charging devices may cause damage to internal components or fires due to excessive temperatures, resulting in property loss or threats to personal safety.

[0005] In the prior art, the charging device detects whether the temperature of the charging device exceeds a preset temperature threshold through a thermistor. When the temperature threshold is exceeded, the charging current to the vehicle is disconnected. When the temperature is lower than the temperature threshold, the charging current is maintained to continue charging the vehicle.

[0006] The inventors of this article have discovered that the above-mentioned prior art has at least the following deficiencies: namely, relying on a single-mode temperature control protection device to provide temperature control protection for the charging device, once the temperature control protection device fails, the charging device will overheat and pose a fire risk. Therefore, how to solve the problem of providing a single-mode temperature control protection for the charging device is an urgent problem that technicians in this field currently need to solve.

[0007] Summary of the Invention

[0008] To solve the technical problems in the prior art, the embodiments of this document provide a temperature control protection device and a corresponding charging device, which are used to solve the problem that the prior art relies on a single mode of temperature control protection, which is less safe for the charging device or the charging process.

[0009] On the one hand, the embodiments of this document provide a temperature control and protection device, including a temperature acquisition unit, a comparison unit, a control unit, a drive unit, and a switch unit;

[0010] The temperature acquisition unit is used to obtain the ambient temperature signal;

[0011] The comparison unit is connected between the temperature acquisition unit and the driving unit, and is used to compare the ambient temperature signal with a preset reference voltage and output a first comparison result;

[0012] The control unit is connected between the temperature acquisition unit and the driving unit, and is used to compare the ambient temperature signal with a preset threshold and output a second comparison result;

[0013] The input end of the driving unit is connected to the comparison unit and the control unit, and the output end of the driving unit is connected to the switch unit, and is used to output a driving signal to the switch unit according to the first comparison result or the second comparison result, wherein the driving signal is used to turn on or off the switch unit;

[0014] The switch unit outputs a charging current when turned on.

[0015] On the other hand, the embodiments of this document also provide a charging device provided with the above-mentioned temperature control protection device.

[0016] By means of the temperature control protection device of the embodiment of the present invention and the charging device using the temperature control protection device, multiple protections for temperature monitoring during the charging process can be achieved, thereby improving charging safety; by means of the hysteresis comparator, it is possible to avoid frequent operation of the switching unit when the temperature approaches the temperature threshold, thereby preventing the charging device from being unstable; by outputting the first comparison result output by the comparison unit and the second comparison result output by the control unit to the input end of the driving unit, it is possible to disconnect the charging current when any unit determines that the ambient temperature exceeds the temperature threshold, thereby ensuring the safety of the charging device and avoiding component aging and fire risks; by using a transistor to implement the driving unit, the implementation cost can be reduced. , ensuring system stability and rapid response; by monitoring and compensating the reference voltage, the accuracy of the temperature control protection device can be automatically adjusted even for long periods of use; by adjusting the output charging current power according to the real-time temperature of the charging device, the problem of the existing technology that the charging device stops charging when it detects that the temperature is too high, resulting in failure to meet the basic requirements of the charging device to ensure normal charging, greatly reducing the user experience, and causing electric car owners to complain about not being able to charge normally, can be solved. The charging device can be controlled to continue to be used safely when the temperature reaches a certain allowable range, which can not only prevent the occurrence of fire, but also maximize the normal operating efficiency of the charging gun, shorten charging time, and improve the user experience. Of course, implementing any product and / or method herein does not necessarily require achieving all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of this article or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of this article. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] FIG1 is a schematic structural diagram of a temperature control protection device according to an embodiment of the present invention;

[0019] FIG2 is a schematic diagram showing a specific circuit structure of a temperature control protection device according to an embodiment of the present invention;

[0020] FIG3 a is a schematic diagram of a temperature control protection device and an electric vehicle charging structure according to an embodiment of the present invention;

[0021] FIG3 b shows another schematic diagram of the temperature control protection device and the electric vehicle charging structure according to the embodiment of this invention;

[0022] FIG4 a is a schematic structural diagram showing a temperature control protection device provided on a charging device according to an embodiment of the present invention;

[0023] FIG4 b shows another structural schematic diagram of a temperature control protection device provided on a charging device according to an embodiment of the present invention;

[0024] FIG4 c is another structural schematic diagram showing that the temperature control protection device according to the embodiment of this invention is arranged on the charging device.

[0025] [Description of Reference Numerals]

[0026] 101, temperature acquisition unit; 102, comparison unit; 103, control unit; 104, drive unit; 105, switch unit; 106, compensation unit; 300, temperature control protection device; 301, temperature acquisition unit; 302, comparison unit; 303, control unit; 304, drive unit; 305, switch unit; 306, compensation unit; 307, power regulation unit; 308, feedback unit; R1, R2, R3, R4, R5, R6, R7, R8, resistors; RT1, thermistor; U1, operational amplifier; D1, D2, diodes; Q1, Q2, Q3, transistors; K1, switch; VCC, power supply; V REF , reference voltage; V i , temperature voltage; V out , output end. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of this document. Obviously, the embodiments described are only part of the embodiments of this document, not all of the embodiments. Based on the embodiments of this document, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this document.

[0028] FIG1 is a schematic diagram of the structure of a temperature control protection device according to an embodiment of the present invention. This figure describes a device that detects and protects the charging process of an electric vehicle through a redundant design, providing multiple protections for the charging safety of electric vehicles such as electric cars, electric bicycles, or electric motorcycles. Specifically, the device includes a temperature acquisition unit 101, a comparison unit 102, a control unit 103, a drive unit 104, and a switch unit 105.

[0029] The temperature acquisition unit 101 is used to obtain an ambient temperature signal representing the ambient temperature of the operating environment;

[0030] a comparison unit 102 connected between the temperature acquisition unit and the driving unit, configured to compare the ambient temperature signal with a preset reference voltage and output a first comparison result;

[0031] a control unit 103 connected between the temperature acquisition unit and the driving unit, configured to compare the ambient temperature signal with a preset threshold value and output a second comparison result;

[0032] a driving unit 104, wherein an input end of the driving unit 104 is connected to the comparing unit 102 and the control unit 103, and an output end of the driving unit 104 is connected to the switching unit 105, and is configured to output a driving signal to the switching unit 105 according to the first comparison result or the second comparison result, wherein the driving signal is used to turn on or off the switching unit 105;

[0033] The switch unit 105 outputs a charging current when turned on.

[0034] The ambient temperature signal may include voltage, current and other signals of the ambient temperature obtained by the sensor; the first comparison result and the second comparison result may be in the form of voltage or current.

[0035] The switching unit is controlled by the comparison results output by the comparison unit and the control unit in the above-mentioned embodiment of the present invention. When one of the comparison results is a disconnection signal, the switching unit will be disconnected and the output of the charging current to the outside will be stopped, thereby realizing multiple protections for temperature monitoring during the charging process and improving charging safety.

[0036] FIG2 is a schematic diagram of the specific circuit structure of a temperature control protection device according to an embodiment of the present invention. This figure illustrates the specific circuit structure of the temperature control protection device. The temperature acquisition unit 101 may be a thermistor, thermocouple, resistance temperature detector, digital sensor, or the like. The thermistor may be a positive temperature coefficient thermistor (PTC) or a negative temperature coefficient thermistor (NTC), such as the NTC thermistor RT1 in FIG2 . Each different temperature acquisition unit can express the ambient temperature information or the temperature information of the electrical components in the charging device as a different temperature voltage. In this embodiment, a voltage divider resistor R3 is also connected to the power input terminal of the temperature acquisition unit 101 to set the temperature voltage output by the temperature acquisition unit 101 to meet the requirements of the back-end comparison unit 102.

[0037] As one aspect of the embodiments of this document, the comparison unit 102 may be a comparator, a first input of the comparator connected to the temperature acquisition unit 101 , a second input of the comparator connected to a reference voltage, and an output of the comparator connected to the driving unit 104 .

[0038] As one aspect of the embodiments of this document, the comparison unit 102 is a hysteresis comparator, the first input end of which is connected to the temperature voltage output by the temperature acquisition unit 101, the second input end is connected to a resistor R7 before being connected to the reference voltage, the output end is connected to the input end of the driving unit 104, the first comparison result is output to the driving unit 104, and the output end is connected in series with a resistor R6 and then connected to the second input end.

[0039] In this embodiment, the aforementioned hysteresis comparator refers to a comparator unit in which, when the amplitude of the temperature voltage input at the first input terminal approaches the reference voltage, if the noise interference at the first input terminal is large and the comparison response speed is sufficiently fast, it may cause an erroneous jump in the output voltage. To enhance the anti-interference capability of the comparator unit, two reference voltages are provided. When the input temperature voltage transitions from a low level to a high level, the output of the comparator unit changes only when the temperature voltage reaches the first reference voltage; and when the input temperature voltage transitions from a high level to a low level, the output of the comparator unit changes only when the input temperature voltage drops to the second reference voltage. Therefore, the structure of the comparator unit in the above embodiment has hysteresis, i.e., inertia, so that slight changes in the input temperature voltage will not cause a jump in the output voltage of the comparator unit, and the comparator unit in this case has anti-interference capability.

[0040] The first comparison result output by the comparison unit 102 can be a high level or a low level, depending on the structure of the driving unit 104, and has the same meaning as the high and low levels of the second comparison result output by the control unit 103 based on the comparison of the temperature voltage and the preset threshold value. That is, for example, when the first comparison result output by the comparison unit 102 indicates that the operating environment temperature (temperature voltage) is higher than the preset temperature (reference voltage), the first comparison result of the high level is output. At this time, when the control unit 103 determines that the operating environment temperature (temperature voltage) is higher than the preset temperature (preset threshold), it should also output the second comparison result of the high level, and vice versa. In this way, the high and low levels of the comparison results output have the same meaning, thereby realizing multiple temperature control protection.

[0041] As one aspect of the embodiment of this article, the control unit 103 is connected to the temperature acquisition unit 101 to obtain the temperature voltage; the control unit 103 is connected to the input end of the driving unit 104 to output the second comparison result to the driving unit 104.

[0042] In this embodiment, the control unit 103 can be a microprocessor (MCU), which receives signals through the IN pin (IN1-IN3) and outputs signals through the OUT pin (OUT1-OUT3). After converting the temperature voltage into digital form, it is compared with a preset threshold. For example, when the numerical value represented by the temperature voltage is greater than the preset threshold, the OUT1 pin outputs a second comparison result representing the disconnection of the switch unit 105. When the numerical value represented by the temperature voltage is less than the preset threshold, the OUT1 pin outputs a second comparison result representing the conduction of the switch unit 105. The second comparison result may be a high level or a low level, depending on the structure of the driving unit 104.

[0043] As one aspect of the embodiments herein, the second transistor Q2 is omitted compared to FIG2 . The driving unit 104 includes a first transistor Q1 . The collector of the first transistor Q1 is connected to the power supply VCC, the base is connected to the comparison unit 102 and the control unit 103 , and the first comparison result output by the comparison unit 102 and the second comparison result output by the control unit 103 are received simultaneously. The emitter is grounded. The collector is also connected to the switch unit 105 . When the first transistor Q1 is turned on, the switch unit 105 is turned on, and when the first transistor Q1 is turned off, the switch unit 105 is turned off. The switch unit 105 can be designed with various structures based on FIG2 , so that the switch unit 105 is turned on or off according to whether the first transistor Q1 is turned on or off.

[0044] In this embodiment, the base is connected to the comparison unit 102 and the control unit 103, and simultaneously receives the first comparison result output by the comparison unit 102 and the second comparison result output by the control unit 103. When either the first comparison result or the second comparison result is a high level, the first transistor Q1 will be turned on. That is, when the comparison unit 102 determines that the current usage environment temperature exceeds the preset temperature and outputs a high-level first comparison result, or the control unit 103 determines that the current usage environment temperature exceeds the preset temperature and outputs a high-level second comparison result, the base of the first transistor Q1 will receive a high level, so that the first transistor Q1 is turned on, thereby turning on the switch unit 105.

[0045] As one aspect of the embodiments of this document, the driving unit 104 includes a first transistor Q1 and a second transistor Q2. The collector of the first transistor Q1 is connected to the power supply VCC, the base of the first transistor Q1 is connected to the comparison unit 102 and the control unit 103, and simultaneously receives a first comparison result output by the comparison unit 102 and a second comparison result output by the control unit 103. The emitter of the first transistor Q1 is grounded; the collector of the second transistor Q2 is connected to the switch unit 105, the base of the second transistor Q2 is connected to the collector of the first transistor Q1, and the emitter of the second transistor Q2 is grounded; when the first transistor Q1 is turned on, the second transistor Q2 is turned off, and the switch unit 105 is turned off; when the first transistor Q1 is turned off, the second transistor Q2 is turned on, and the switch unit 105 is turned on.

[0046] In the above embodiment, other forms can also be used to implement the function of the driving unit 104, and a PNP transistor or a MOS tube can also be used to drive the switching unit 105, wherein the switching unit is, for example, a relay. For example, the first comparison result output by the comparison unit 102 can be converted into a digital form and an "OR" operation is performed with the second comparison result in digital form output by the control unit 103. When one of the two is a high level, it means that the ambient temperature exceeds the preset temperature, and the switching unit 105 is disconnected. The above judgment and operation can be achieved through the gate circuit in the digital circuit. Other forms of judgment and operation circuits can also be used, which will not be repeated here.

[0047] As one aspect of the embodiments of this article, the temperature control protection device also includes a compensation unit 106, which is connected between the comparison unit 102 and the control unit 103. When the control unit 103 detects that the reference voltage has a deviation, it outputs an adjustment voltage to the compensation unit 106 to adjust the reference voltage.

[0048] In this embodiment, when the electrical components that output the reference voltage to the comparison unit 102 age or the ambient temperature changes, causing these electrical components to change, resulting in drift of the reference voltage, the control unit 103 can adjust the reference voltage to make the reference voltage more accurate, thereby improving the accuracy of the temperature determination by the comparison unit 102. The control unit 103 obtains the reference voltage, compares the temperature voltage with the preset threshold value, generates an adjustment voltage for the reference voltage, and applies it to the reference voltage.

[0049] As one aspect of the embodiments of this document, the compensation unit 106 further includes a third transistor Q3, wherein the collector of the third transistor Q3 is connected to the power supply VCC and the reference voltage of the comparison unit 102, the base of the third transistor Q3 is connected to the control unit 103, and the emitter of the third transistor Q3 is grounded; when the control unit 103 determines that the received reference voltage is not equal to a preset threshold, the OUT2 pin of the control unit 103 outputs a regulated voltage to the base of the third transistor Q3 to control the reference voltage on the collector of the third transistor Q3.

[0050] In this embodiment, the input pin of the control unit 103 is connected to the reference voltage of the second input terminal of the comparison unit 102 to obtain the reference voltage of the second input terminal of the comparison unit 102. When the reference voltage drifts due to changes in electrical components, the reference voltage obtained by the control unit 103 is not equal to the preset threshold value. For example, the set reference voltage is 0.5V, and the set preset threshold value is also 0.5V, but the drifted reference voltage is 0.48V. At this time, when the control unit 103 compares the collected reference voltage and the preset threshold value and finds that it is different, it will control the output pin to output the adjustment voltage, turn on the third transistor Q3, and thus adjust the reference voltage input to the second input terminal of the comparison unit 102, adjusting it from 0.48V back to the set 0.5V.

[0051] As one aspect of the embodiments of this article, the control unit 103 also includes a first output pin, which is used to output a pulse modulation signal (PWM) according to the temperature voltage to adjust the power of the output charging current, and output the pulse modulation signal to the electric vehicle through an interface connected to the electric vehicle.

[0052] In this embodiment, as the temperature of the charging device increases or decreases, the control unit 103 can reduce or increase the power of the output charging current according to the degree of temperature increase or decrease (the temperature does not reach the preset threshold when it increases, that is, the temperature does not exceed the safe charging temperature). For example, for an AC charging device, due to the temperature increase, a PWM signal is used to adjust the charging current from 8A to 6A. The PWM signal for adjusting the output charging power is sent to the battery management system (BMS) of the electric vehicle. The BMS system uses the corresponding charging current to charge the battery through the power adjustment unit of the electric vehicle. In this way, the control of reducing the charging current intensity can be achieved. After the temperature of the charging device increases, the charging of the electric vehicle can still be continued, instead of directly stopping the charging device from charging the electric vehicle as in the prior art. This can improve the charging efficiency and enhance the user experience of charging the electric vehicle.

[0053] As one aspect of the embodiment of this document, the control unit 103 further includes a second output pin, configured to output a charging power adjustment signal (CAN / Ethernet) based on the temperature voltage, and output the charging power adjustment signal to the electric vehicle via an interface connected to the electric vehicle;

[0054] The temperature control protection device further includes a power adjustment unit connected between the control unit 103 and the switch unit 105, and configured to adjust the power of the output charging current according to the charging power adjustment signal.

[0055] In this embodiment, as the temperature of the charging device increases or decreases, the control unit 103 can reduce or increase the power of the output charging current based on the degree of temperature increase or decrease (if the temperature does not reach a preset threshold, i.e., the temperature does not exceed the safe charging temperature). For example, for a DC charging device, the control unit 103 outputs a charging power adjustment signal to the power adjustment unit to reduce or increase the power of the charging current output by the power adjustment unit. When the temperature of the charging device exceeds the preset threshold, i.e., exceeds the safe charging temperature, the control unit 103 or the comparison unit 102 outputs a drive signal to drive the switch unit 105 to disconnect. When the switch unit 105 is disconnected, the power adjustment unit stops supplying charging current to the electric vehicle, thereby reducing the temperature inside the charging device and the electric vehicle battery, ensuring the safety of the charging process. The charging power adjustment signal output by the control unit 103 can also be transmitted to the electric vehicle's battery management system via the CAN bus or Ethernet bus of the charging gun on the charging device. The BMS system then uses the charging current output from the charging device switch unit 105 to charge the battery at a corresponding power according to the charging power adjustment signal. This can achieve the control of reducing the charging current intensity, and can continue charging the electric vehicle after the temperature of the charging device rises, instead of directly stopping the charging device from charging the electric vehicle as in the prior art, thereby improving the charging efficiency and enhancing the user experience of charging the electric vehicle.

[0056] Continuing to refer to Figure 2, VCC is the positive terminal of the power supply voltage source (hereinafter referred to as power supply), GND is the negative terminal of the power supply voltage source, V REF The reference voltage V is the set temperature threshold, which is connected to the resistor R7. The other end of the resistor R7 is connected to the positive input pin (second input terminal) of the operational amplifier. REF It can be a fixed value or a preset threshold value inside the control unit 103. In this case, the temperature control protection device can automatically adjust the temperature threshold. The thermistor RT1 is a thermal element. One end of the thermistor RT1 is connected to the ground, and the other end is connected to the resistor R3 to form the temperature acquisition unit 101. The temperature acquisition unit 101 is connected to the input end of the comparison unit 102, that is, the connection point between the resistor R3 and the thermistor RT1 is connected to the reverse input pin (first input end) of the operational amplifier U1; the thermistor RT1 and the resistor R3 form a voltage divider circuit. The thermistor RT1 can be an NTC thermistor. When the ambient temperature rises, the resistance value of the thermistor RT1 decreases, and the temperature voltage V of its voltage divider value i The voltage value decreases, and vice versa when the temperature decreases, V i Resistor R6 is a feedback resistor connecting the output pin (output terminal) and the positive pin (second input terminal) of the operational amplifier U1.

[0057] When V i <V REF When V out The output terminal of the operational amplifier U1, the operational amplifier U1 outputs a high level; V i >V REF , U1 outputs low level; V out The first transistor Q1 is connected to one end of the diode D1, the other end of D1 is connected to the resistor R4, the other end of the resistor R4 is connected to the base of the first transistor Q1 of the driving unit 104, one end of the resistor R5 is connected to the power supply VCC, and the other end is connected to the collector of the first transistor Q1, the base of the second transistor Q2 is connected to the connection point between the collector of the first transistor Q1 and the resistor R5, the emitter of the second transistor Q2 is connected to GND, and the collector of the second transistor Q2 is connected to the control end of the switch unit 105. When V out When the voltage is high, the first transistor Q1 is turned on, the second transistor Q2 is turned off, and the switch K1 of the power supply network (the function of the switch K1 is to control the charging current path entering the electric vehicle. When the switch K1 is disconnected, the charging current to the electric vehicle is directly cut off and the charging process is terminated) is disconnected, and the charging current output by the charging device to the electric vehicle is cut off; when V out Output low level, the first transistor Q1 is turned off, the second transistor Q2 is turned on, the power supply network switch K1 is closed, and the charging current is kept output to the electric vehicle. L_IN, K1 and L_OUT are a path in the main power supply network. When the ambient temperature of the charging device or the temperature of the electrical components in the charging device exceeds the preset temperature threshold, V out Output high level, disconnect the power supply network, and the charging current output by L_OUT is 0.

[0058] The thermistor RT1 can be integrated with other electrical components such as the operational amplifier U1, or can be placed separately. The number of thermistors RT1 can be one or more, and they can be located in different parts of the charging device to collect the ambient temperature of different parts of the charging device or the temperature of electrical components (referred to as ambient temperature in other parts of this article).

[0059] The operational amplifier U1 can be a hysteresis comparator to prevent the switch K1 from switching between the closed and open states when the ambient temperature is near the temperature threshold. When the ambient temperature is ≥ T1, the switch unit 105 is disconnected, and when the ambient temperature is ≤ T2, the switch unit 105 is closed, where T1>T2. The difference between T1-T2 can be changed by adjusting the resistance values ​​of the resistors R6 and R7. The hysteresis voltage width △V=(R7 / R6)×(VH-VL), where VH is VCC and VL is 0V. The two threshold voltages u+=(VH-V REF)×R7 / (R7+R6),u-=(VL-V REF )×R7 / (R7+R6); when the output voltage of the hysteresis comparator V out =VH, then V REF =u+; when the temperature voltage V i Greater than V REF When the hysteresis comparator output voltage V out Change to VL, and V REF The voltage at point 1 also becomes u-. Under this condition, when V i The voltage is less than V REF When the output voltage V out Change to VH, because u+-u-=△V, so the sensitivity of the hysteresis comparator is lower than that of the ordinary comparator, but its anti-interference ability is greatly improved.

[0060] In order to improve the safety of the charging device, the control unit 103 collects the temperature voltage V i and reference voltage V REF , when the reference voltage V REF When there is a deviation from the preset threshold, that is, the reference voltage V REF changes, the reference voltage V is adjusted by the compensation unit 106 REF The value of the reference voltage V REF The value of the temperature is increased to improve the accuracy of temperature judgment. One output end of the control unit 103 is connected to the resistor R1, the other end of the resistor R1 is connected to the base of the third transistor Q3, the emitter of the third transistor Q3 is connected to GND, and the collector of the third transistor Q3 is connected to one end of the resistor R2 and is connected to the reference voltage V REF The other end of the resistor R2 is connected to the power supply VCC, and the control unit 103 controls the duty cycle of the third transistor Q3 by outputting the regulated voltage to achieve the reference voltage V REF of adjustment.

[0061] The control unit 103 also detects the state of the switch K1 through the feedback of the resistor R8 connected thereto. When it is detected that the ambient temperature exceeds the preset threshold, the switch K1 still remains in the on state, which means that the comparison unit 102 has lost control of the switch K1. The control unit 103 detects the state of the switch K1 through the V i The temperature is compared with a preset threshold. When it reaches or exceeds the preset threshold, a high level is output, which, through diode D2, turns on the first transistor Q1 and turns off the second transistor Q2, thereby disconnecting the power supply network. The comparison unit 102 and the control unit 103 implement dual detection of the temperature acquisition unit 101 and dual control of the drive unit 104, improving the safety of the charging device.

[0062] FIG3a is a schematic diagram of a temperature control device and an electric vehicle charging structure according to an embodiment of the present invention. In this embodiment, the charging device is an AC charging system. When the ambient temperature rises but does not exceed a set temperature threshold, the control unit 303 of the temperature control device 300 modifies the duty cycle of the communication signal. For example, when the charging current is 8A, the corresponding duty cycle value (PWM signal) is 13.3%, and when the charging current is 6A, the corresponding duty cycle value (PWM signal) is 10%. This adjusts the charging current power. The control unit 303 outputs the modified communication signal to the power regulation unit 307 of the electric vehicle. The power regulation unit 307 reduces the charging current intensity under the control of the electric vehicle's BMS system. When the switch unit 305 is disconnected, charging of the electric vehicle is stopped. In other embodiments, the control unit 303 may also output a control signal to adjust the voltage of the charging current.

[0063] FIG3 a also includes a feedback unit 308 for acquiring the driving signal of the driving unit 304 , so that the control unit 303 can determine whether the driving unit 304 drives the switch unit 305 correctly.

[0064] As shown in Figure 3b, this is another schematic diagram of the temperature control protection device and the electric vehicle charging structure of the embodiment of this invention. In this embodiment, the charging device is a DC charging system. When the ambient temperature rises but does not exceed the set temperature threshold, the temperature control protection device 300 control unit 303 adjusts the power of the charging current and generates a charging power adjustment signal. The charging power adjustment signal is sent to the electric vehicle in the form of a CAN message through the CAN bus interface in the charging gun connected to the electric vehicle, thereby reducing the power of the charging current; and the charging power adjustment signal is also output to the power adjustment unit 307 in the temperature control protection device. The power adjustment unit 307 adjusts the power of the output charging current according to the charging power adjustment signal (adjusts the current or voltage, or adjusts the current and voltage at the same time) to charge the battery of the electric vehicle.

[0065] The power regulating unit 307 receives the charging current from the charging device, regulates the power of the charging current, and outputs the power to the electric vehicle through the switch unit 305 .

[0066] In the above embodiments, the power of the charging current is reduced to charge the electric vehicle battery, which can reduce the temperature of the charging device and the electric vehicle battery (and the charging components). When the temperature of the charging device is lower than another temperature threshold (low temperature threshold value), the ambient temperature can be obtained according to the temperature acquisition unit, and then the control unit outputs a control instruction to the power adjustment unit according to the ambient temperature to restore the power of the charging current and increase the charging speed.

[0067] FIG4 a is a schematic diagram of the structure of a temperature control and protection device according to an embodiment of the present invention disposed on a charging device, which describes the temperature control and protection device described above being disposed on the power connector portion of the charging device for detecting the temperature of the electrical components of the power connector portion or the ambient temperature. For example, it can be disposed on the power input portion of the charging device. FIG4 b is another schematic diagram of the structure of a temperature control and protection device according to an embodiment of the present invention disposed on a charging device, which describes the temperature control and protection device described above being disposed on the charging control unit portion of the charging device for detecting the temperature of the electrical components of the charging control unit portion or the ambient temperature. FIG4 c is another schematic diagram of the structure of a temperature control and protection device according to an embodiment of the present invention disposed on a charging device, which describes the temperature control and protection device described above being disposed on the vehicle connector portion of the charging device for detecting the temperature of the electrical components of the vehicle connector portion or the ambient temperature. The vehicle connector can be, for example, a charging gun or a charging plug. Of course, as the temperature acquisition unit in the temperature control and protection device is disposed in different parts of the charging device, no matter where the temperature control and protection device is disposed on the charging device, it can be used to detect the temperature of the electrical components or the ambient temperature of various parts of the charging device.

[0068] By means of the temperature control protection device of the embodiment of the present invention and the charging device using the temperature control protection device, multiple protections for temperature monitoring during the charging process can be achieved, thereby improving charging safety; by means of the hysteresis comparator, it is possible to avoid frequent operation of the switching unit when the temperature approaches the temperature threshold, thereby preventing the charging device from being unstable; by outputting the first comparison result output by the comparison unit and the second comparison result output by the control unit to the input end of the driving unit, it is possible to disconnect the charging current when any unit determines that the ambient temperature exceeds the temperature threshold, thereby ensuring the safety of the charging device and avoiding component aging and fire risks; by using a transistor to implement the driving unit, the implementation cost can be reduced. , ensuring system stability and quick response; through monitoring and compensation of the reference voltage, the accuracy of the temperature control protection device can be automatically adjusted even after long-term use; by adjusting the output charging current power according to the real-time temperature of the charging device, the problem of stopping charging when the charging device detects that the temperature is too high in the prior art is solved, resulting in the inability to meet the basic requirements of the charging device to ensure normal charging, greatly reducing the user experience. Electric vehicle owners complain about the problem of not being able to charge normally. The charging device can be controlled to continue to be used safely when the temperature reaches a certain permitted range, which can not only prevent the occurrence of fire, but also maximize the normal working efficiency of the charging gun, shorten the charging time, and improve the user experience.

[0069] It should also be understood that in the embodiments herein, the term "and / or" merely describes an association between associated objects, indicating that three possible relationships exist. For example, "A and / or B" could represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0070] This article uses specific embodiments to illustrate the principles and implementation methods of this article. The description of the above embodiments is only used to help understand the methods and core ideas of this article. At the same time, for those skilled in the art, based on the ideas of this article, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation to this article.

Claims

1. A temperature control protection device, characterized in that Including temperature acquisition unit, comparison unit, control unit, drive unit, and switch unit; The temperature acquisition unit is used to obtain the ambient temperature signal; The comparison unit is connected between the temperature acquisition unit and the driving unit, and is used to compare the ambient temperature signal with a preset reference voltage and output a first comparison result; The control unit is connected between the temperature acquisition unit and the driving unit, and is used to compare the ambient temperature signal with a preset threshold and output a second comparison result; The input end of the driving unit is connected to the comparison unit and the control unit, and the output end of the driving unit is connected to the switch unit, and is used to output a driving signal to the switch unit according to the first comparison result or the second comparison result, wherein the driving signal is used to turn on or off the switch unit; The switch unit outputs current when turned on.

2. The temperature control protection device according to claim 1, characterized in that: The comparison unit is a comparator, a first input end of the comparator is connected to the temperature acquisition unit, a second input end of the comparator is connected to a reference voltage, and an output end of the comparator is connected to the driving unit.

3. The temperature control protection device according to claim 2, characterized in that: The comparison unit is a hysteresis comparator, the temperature acquisition unit outputs an ambient temperature signal, a resistor R7 is connected before the second input end is connected to the reference voltage, the output end is connected to the input end of the driving unit, the first comparison result is output to the driving unit, and the output end is connected in series with a resistor R6 and then connected to the second input end.

4. The temperature control protection device according to claim 1, characterized in that: The driving unit includes a first transistor Q1, a collector of which is connected to a power supply VCC, a base of which is connected to the comparison unit and the control unit, and receives a first comparison result output by the comparison unit and a second comparison result output by the control unit. The emitter is grounded, wherein the collector is also connected to the switch unit. When the first transistor Q1 is turned on, the switch unit is turned off, and when the first transistor Q1 is turned off, the switch unit is turned on.

5. The temperature control protection device according to claim 1, characterized in that: The driving unit includes a first transistor Q1 and a second transistor Q2. The collector of the first transistor Q1 is connected to a power supply VCC, the base of the first transistor Q1 is connected to the comparison unit and the control unit, and simultaneously receives a first comparison result output by the comparison unit and a second comparison result output by the control unit. The emitter of the first transistor Q1 is grounded; the collector of the second transistor Q2 is connected to the switch unit, the base of the second transistor Q2 is connected to the collector of the first transistor Q1, and the emitter of the second transistor Q2 is grounded; when the first transistor Q1 is turned on, the second transistor Q2 is turned off, and the switch unit is turned off; when the first transistor Q1 is turned off, the second transistor Q2 is turned on, and the switch unit is turned on.

6. The temperature control protection device according to claim 1, characterized in that: The temperature control protection device further includes a compensation unit connected between the comparison unit and the control unit. When the control unit detects that the reference voltage has a deviation, the compensation unit outputs an adjustment voltage to adjust the reference voltage.

7. The temperature control protection device according to claim 6, characterized in that: The compensation unit further includes a third transistor Q3, wherein the collector of the third transistor Q3 is connected to the power supply VCC and the reference voltage of the comparison unit, the base of the third transistor Q3 is connected to the control unit, and the emitter of the third transistor Q3 is grounded; when the control unit determines that the received reference voltage is not equal to the preset threshold, the control unit outputs a regulating voltage to the base of the third transistor Q3 to control the reference voltage on the collector of the third transistor Q3.

8. The temperature control protection device according to claim 1, characterized in that: When the temperature control protection device is applied to an AC charging device, the control unit also includes a first output pin, which is used to output a pulse modulation signal according to the ambient temperature signal to adjust the power of the output charging current, and output the pulse modulation signal to the electric vehicle through an interface connected to the electric vehicle.

9. The temperature control protection device according to claim 1, characterized in that: When the temperature control protection device is applied to a DC charging device, the control unit further includes a second output pin for outputting a charging power adjustment signal according to the ambient temperature signal, and outputting the charging power adjustment signal to the electric vehicle through an interface connected to the electric vehicle; The temperature control protection device further includes a power adjustment unit connected between the control unit and the switch unit, and configured to adjust the power of the output charging current according to the charging power adjustment signal.

10. The temperature control protection device according to claim 9, characterized in that: The interface for connecting the control unit with the electric vehicle includes a CAN bus or Ethernet.

11. A charging device, characterized in that It comprises the temperature control protection device as described in any one of claims 1 to 10 above.

12. The charging device according to claim 11, characterized in that The temperature control protection device is provided on the power connector of the charging device; or, The temperature control protection device is provided in the charging control unit of the charging device; or, The temperature control protection device is arranged on the vehicle connector of the charging device.

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