Control circuit and automobile

Abstract

The utility model provides a control circuit and an automobile, and relates to the technical field of automobile electronics, and the control circuit can reduce noise. The control circuit comprises a temperature detection sub-circuit and a voltage control sub-circuit; the input end of the temperature detection sub-circuit is electrically connected with the power supply end, and the output end of the temperature detection sub-circuit is electrically connected with the first input end of the voltage control sub-circuit; the output end of the voltage control sub-circuit is electrically connected with a load; the output end of the temperature detection sub-circuit is electrically connected with the second input end of the voltage control sub-circuit; the temperature detection sub-circuit is configured to generate a first voltage according to the detected temperature and output the first voltage; the voltage control sub-circuit is configured to receive the first voltage, convert the first voltage into a third voltage, and detect whether the voltage value of the third voltage is within a set voltage range; if yes, the voltage control sub-circuit outputs a first voltage to a load; and if not, the voltage control sub-circuit is disconnected or the voltage control sub-circuit outputs the second voltage to the load.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile electronic technology, especially to a control circuit and automobile. BACKGROUND

[0002] The rapid development of automobiles also brings great challenges to the reliability of vehicle-mounted systems. In recent years, the fans for heat dissipation in vehicle-mounted systems are all turned on or off according to temperature, and single fans are used, the fan power is not adjustable, or only multiple gears are adjustable. When the fan needs to be turned on, the fan works according to the preset power, which may generate excess noise at this time, affecting the user experience.

[0003] Moreover, even if stepless dynamic speed regulation is realized, software cooperation is needed to realize it; for example, Pulse Width Modulation (PWM) speed regulation, which greatly depends on software, further increases the cost. CONTENT OF THE UTILITY MODEL

[0004] The embodiment of the utility model provides a control circuit and automobile, can further reduce noise.

[0005] In the first aspect, the utility model provides a control circuit, this control circuit includes: temperature detection subcircuit and voltage control subcircuit, temperature detection subcircuit's input end is connected with power supply end electricity, and temperature detection subcircuit's output end is connected with voltage control subcircuit's first input end electricity, voltage control subcircuit's output end is connected with load electricity, temperature detection subcircuit's output end is connected with voltage control subcircuit's second input end electricity, temperature detection subcircuit is configured as generating first voltage and output according to the temperature detected, and first voltage increases along with the temperature rises, voltage control subcircuit is configured as receiving first voltage, and first voltage is converted into third voltage, and detects whether the voltage value of third voltage is in the set voltage range, if yes, voltage control subcircuit exports first voltage to load, if no, then voltage control subcircuit disconnects or voltage control subcircuit exports second voltage to load, wherein, the voltage value of second voltage is greater than or equal to the maximum value of the voltage value of first voltage.

[0006] Based on the above scheme, some embodiments of the present application provide a control circuit, which detects temperature through a temperature detection sub-circuit, and converts the temperature into a first voltage, the size of the first voltage representing the size of the temperature, and a voltage control sub-circuit converts the first voltage into a third voltage, the size of the third voltage representing the size of the first voltage, and finally the voltage control sub-circuit detects whether the voltage value of the third voltage is within a set voltage range, if the voltage value of the third voltage is within the set voltage range, the voltage control sub-circuit transmits the received first voltage to the fan through the second input end, in this way, within the set voltage range, as the temperature rises, the first voltage also rises, the power of the fan will become larger and larger, and the heat dissipation efficiency is relatively high, so that the automatic adjustment of the hardware can be realized, so that the use of the fan is more efficient, and the noise is reduced to a certain extent.

[0007] As a possible implementation manner, the minimum value of the set voltage range is a first set voltage, and the maximum value of the set voltage range is a second set voltage; the first set voltage is the lowest voltage of the load working, and the second set voltage is the highest voltage of the load working; in the case that the voltage value of the first voltage is less than the voltage value of the first set voltage, the voltage control sub-circuit is disconnected, and the load does not work; in the case that the voltage value of the first voltage is greater than the voltage value of the second set voltage, the voltage control sub-circuit outputs the second voltage to the load.

[0008] As a possible implementation manner, the temperature detection sub-circuit comprises: a first voltage stabilizer, a first voltage division module and a thermistor; the input end of the first voltage stabilizer is electrically connected with the input end of the temperature detection sub-circuit, the output end of the first voltage stabilizer is electrically connected with the output end of the temperature detection sub-circuit, and further electrically connected with the first end of the first voltage division module; the feedback end of the first voltage stabilizer is electrically connected with the second end of the first voltage division module; the first end of the thermistor is electrically connected with the third end of the first voltage division module, and the second end of the thermistor is electrically connected with the ground end; the first voltage stabilizer is configured to output a feedback voltage to the second end of the first voltage division module through the feedback end.

[0009] As a possible implementation manner, the first voltage division module comprises: a first resistor and a second resistor; the first end of the first resistor is electrically connected with the first end of the first voltage division module, the second end of the first resistor is electrically connected with the second end of the first voltage division module, and further electrically connected with the first end of the second resistor, and the second end of the second resistor is electrically connected with the third end of the first voltage division module.

[0010] As a possible implementation manner, the temperature detection sub-circuit further comprises: a first capacitor and a second capacitor; the first end of the first capacitor is electrically connected with the power supply end, and the second end of the first capacitor is electrically connected with the ground end; the first end of the second capacitor is electrically connected with the output end of the temperature detection sub-circuit, and the second end of the second capacitor is electrically connected with the ground end.

[0011] As a possible implementation manner, in a case where the set voltage range includes a first set voltage and a second set voltage, the voltage control sub-circuit includes a second voltage stabilizer, a voltage providing module, a comparison module and a switch module; the input end of the voltage providing module is electrically connected with the first input end of the voltage control sub-circuit, and the first output end of the voltage providing module is electrically connected with the first input end of the comparison module; the second output end of the voltage providing module is electrically connected with the second input end and the fourth input end of the comparison module; the third output end of the voltage providing module is electrically connected with the third input end of the comparison module; the voltage providing module is configured to generate a third voltage according to the first voltage and transmit the third voltage to the comparison module through the second output end; and is further configured to output the first set voltage to the comparison module through the first output end and output the second set voltage to the comparison module through the third output end.

[0012] The control end of the switch module is electrically connected with the first output end of the comparison module, the input end of the switch module is electrically connected with the second input end of the voltage control sub-circuit, and the output end of the switch module is electrically connected with the output end of the voltage control sub-circuit; the control end of the second voltage stabilizer is electrically connected with the second output end of the comparison module, the output end of the second voltage stabilizer is electrically connected with the second voltage end and the output end of the voltage control sub-circuit; the comparison module is configured to compare the voltage values of the first voltage and the first set voltage; compare the voltage values of the first voltage and the second set voltage; the switch module is configured to be turned on when the first output end of the comparison module outputs a first level and transmit the first voltage to the output end of the voltage control sub-circuit; the second voltage stabilizer is configured to work when the second output end of the comparison module outputs the first level, and the second voltage end transmits the second voltage to the load.

[0013] As a possible implementation manner, the voltage providing module includes a second voltage dividing module, a third voltage dividing module and a fourth voltage dividing module; the first end of the second voltage dividing module is electrically connected with the first voltage end, the second end of the second voltage dividing module is electrically connected with the first output end of the voltage providing module, and the third end of the second voltage dividing module is electrically connected with the ground end; the first end of the third voltage dividing module is electrically connected with the input end of the voltage providing module, the second end of the third voltage dividing module is electrically connected with the second output end of the voltage providing module, and the third end of the third voltage dividing module is electrically connected with the ground end; the first end of the fourth voltage dividing module is electrically connected with the first voltage end, the second end of the fourth voltage dividing module is electrically connected with the third output end of the voltage providing module, and the third end of the fourth voltage dividing module is electrically connected with the ground end; the second voltage dividing module is configured to output the first set voltage, the third voltage dividing module is configured to output the third voltage, and the fourth voltage dividing module is configured to output the second set voltage.

[0014] As a possible implementation manner, the second voltage dividing module comprises: a third resistor and a fourth resistor; a first end of the third resistor is electrically connected with the first end of the second voltage dividing module, a second end of the third resistor is electrically connected with the second end of the second voltage dividing module, and further electrically connected with a first end of the fourth resistor; a second end of the fourth resistor is electrically connected with the third end of the second voltage dividing module.

[0015] The third voltage dividing module comprises: a fifth resistor and a sixth resistor; a first end of the fifth resistor is electrically connected with the first end of the third voltage dividing module, a second end of the fifth resistor is electrically connected with the second end of the third voltage dividing module, and further electrically connected with a first end of the sixth resistor; a second end of the sixth resistor is electrically connected with the third end of the third voltage dividing module.

[0016] The fourth voltage dividing module comprises: a seventh resistor and an eighth resistor; a first end of the seventh resistor is electrically connected with the first end of the fourth voltage dividing module, a second end of the seventh resistor is electrically connected with the second end of the fourth voltage dividing module, and further electrically connected with a first end of the eighth resistor; a second end of the eighth resistor is electrically connected with the third end of the fourth voltage dividing module.

[0017] As a possible implementation manner, the comparison module comprises: a first comparator, a second comparator, a third comparator and an AND gate; a first end of the first comparator is electrically connected with the first input end of the comparison module, a second end of the first comparator is electrically connected with the second input end of the comparison module; a first end of the second comparator is electrically connected with the second input end of the comparison module, a second end of the second comparator is electrically connected with the third input end of the comparison module; a first end of the third comparator is electrically connected with the third input end of the comparison module, a second end of the third comparator is electrically connected with the fourth input end of the comparison module; a first input end of the AND gate is electrically connected with an output end of the first comparator, a second input end of the AND gate is electrically connected with an output end of the second comparator, and an output end of the AND gate is electrically connected with the first output end of the comparison module.

[0018] As a possible implementation manner, the switch module comprises: a first transistor, a second transistor, a third transistor and a ninth resistor; a control end of the first transistor is electrically connected with a control end of the switch module, a first end of the first transistor is electrically connected with a second end of the ninth resistor, and further electrically connected with a control end of the second transistor and a control end of the third transistor; a second end of the first transistor is electrically connected with a ground end; a first end of the ninth resistor is electrically connected with a first voltage end; a first end of the second transistor is electrically connected with an input end of the switch module, and the first end of the second transistor is electrically connected with a first end of the third transistor; a second end of the third transistor is electrically connected with an output end of the switch module.

[0019] As a possible implementation manner, the voltage control sub-circuit further comprises a fifth voltage dividing module; a first end of the fifth voltage dividing module is electrically connected with the output end of the second voltage stabilizer, a second end of the fifth voltage dividing module is electrically connected with the feedback end of the second voltage stabilizer, and a third end of the fifth voltage dividing module is electrically connected with the ground end.

[0020] As a possible implementation manner, the voltage control sub-circuit further comprises a third capacitor and a fourth capacitor; a first end of the third capacitor is electrically connected with the power supply end, and a second end of the third capacitor is electrically connected with the ground end; a first end of the fourth capacitor is electrically connected with the output end of the voltage control sub-circuit and the second voltage end, and a second end of the fourth capacitor is electrically connected with the ground end.

[0021] In a second aspect, the application further provides an automobile, comprising the control circuit and the load.

[0022] The beneficial effects of the second aspect are the same as those of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A schematic diagram of the control circuit is provided for the utility model;

[0024] Figure 2 A schematic diagram of the temperature detection sub-circuit is provided for the utility model;

[0025] Figure 3 A schematic diagram of the voltage control sub-circuit is provided for the utility model;

[0026] Figure 4 A schematic diagram of the automobile is provided for the utility model.

[0027] REFERENCE SIGNS

[0028] 1, temperature detection sub-circuit; 2, voltage control sub-circuit; 11, first voltage stabilizer; 12, first voltage dividing module; 21, second voltage stabilizer; 22, voltage providing module; 23, comparison module; 24, switch module; 32, second voltage dividing module; 33, third voltage dividing module; 34, fourth voltage dividing module; 35, fifth voltage dividing module; 100, control circuit; 110, load; 200, automobile.

[0029] RT, thermistor; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; R12, twelfth resistor; R13, thirteenth resistor; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; A1, first comparator; A2, second comparator; A3, third comparator; AND, AND gate; Q1, first transistor; Q2, second transistor; Q3, third transistor. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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 this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, when describing pipelines or channels, the terms "connection" and "linking" used in this application have the meaning of conducting electricity. The specific meaning needs to be understood in conjunction with the context.

[0033] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0034] The rapid development of automobiles also brings great challenges to the reliability of vehicle systems. In recent years, the fans for heat dissipation in vehicle systems are opened or closed according to temperature, and single fan power is not adjustable or only multiple adjustable gears are provided. When the fan needs to be turned on, the fan works according to the preset power, which may generate excess noise and affect the user experience.

[0035] Moreover, even if stepless dynamic speed regulation is realized, software cooperation is needed to realize it; for example, Pulse Width Modulation (PWM) speed regulation, which depends on software to a large extent, further increases the cost.

[0036] Therefore, some embodiments of the present application provide a control circuit, as shown in the figure, which includes a temperature detection sub-circuit 1 and a voltage control sub-circuit 2. Figure 1

[0037] The input end VX of the temperature detection sub-circuit 1 is electrically connected to the power supply end VIN, the output end VSEN of the temperature detection sub-circuit 1 is electrically connected to the first input end VSEN1 of the voltage control sub-circuit 2, the output end VSENO of the voltage control sub-circuit 2 is electrically connected to the load 110, and the output end VSEN of the temperature detection sub-circuit 1 is electrically connected to the second input end VSEN2 of the voltage control sub-circuit 2.

[0038] The temperature detection sub-circuit 1 is configured to generate a first voltage V1 according to the detected temperature and output the first voltage V1.

[0039] Wherein, the first voltage V1 increases with the increase of temperature.

[0040] The voltage control sub-circuit 2 is configured to receive the first voltage V1 and convert the first voltage V1 into a third voltage V3, and detect whether the voltage value of the third voltage V3 is within a set voltage range.

[0041] If yes, the voltage control sub-circuit 2 outputs the first voltage V1 to the load 110; if no, the voltage control sub-circuit 2 is disconnected or the voltage control sub-circuit 2 outputs a second voltage V2 to the load 110.

[0042] Wherein, the voltage value of the second voltage V2 is greater than or equal to the maximum value of the voltage value of the first voltage V1.

[0043] In some embodiments, the above-mentioned load 110 is a fan. Wherein, the fan must be within its set voltage range to work stably. The main function of the fan is to dissipate heat, and it starts to work when the temperature is high.

[0044] ​For example, the temperature detection sub-circuit 1 converts the temperature into the first voltage V1, which means that the temperature is detected by the temperature detection sub-circuit 1 and converted into the first voltage V1, that is, the size of the first voltage V1 represents the size of the temperature, the higher the temperature, the greater the first voltage V1. Then the voltage control sub-circuit 2 converts the first voltage V1 into the third voltage V3, and the third voltage V3 is positively correlated with the first voltage V1, that is, the greater the first voltage V1, the greater the third voltage V3.

[0045] At the same time, the voltage control sub-circuit 2 detects whether the voltage value of the third voltage V3 is within the set voltage range. If the voltage value of the third voltage V3 is within the set voltage range, the voltage control sub-circuit 2 transmits the received first voltage V1 to the fan through the second input terminal VSEN2. In this way, within the set voltage range, as the temperature rises, the first voltage V1 also rises, and the power of the fan will become greater and greater, and the heat dissipation efficiency is relatively high, so that the automatic adjustment of the hardware can be realized, and noise can not be generated.

[0046] When the voltage value of the third voltage V3 is not within the set voltage range, if it is less than the set voltage range, it means that the first voltage V1 at this time cannot reach the voltage for stable operation of the fan, and the fan does not work. If it is greater than the set voltage range, the voltage control sub-circuit 2 outputs the second voltage V2 to the fan at this time. Ideally, the voltage value of the second voltage V2 is the maximum value of the voltage value of the first voltage V1, but there are other components in the circuit, so the voltage value of the second voltage V2 is greater than or equal to the maximum value of the voltage value of the first voltage V1.

[0047] Based on the above scheme, some embodiments of the present application provide a control circuit 100. The control circuit 100 detects the temperature by the temperature detection sub-circuit 1 and converts the temperature into the first voltage V1, which represents the size of the temperature by the size of the first voltage V1. The voltage control sub-circuit 2 converts the first voltage V1 into the third voltage V3, which represents the size of the first voltage V1 by the size of the third voltage V3. Finally, the voltage control sub-circuit 2 detects whether the voltage value of the third voltage V3 is within the set voltage range. If the voltage value of the third voltage V3 is within the set voltage range, the voltage control sub-circuit 2 transmits the received first voltage V1 to the fan through the second input terminal. In this way, within the set voltage range, as the temperature rises, the first voltage V1 also rises, and the power of the fan will become greater and greater, and the heat dissipation efficiency is relatively high, so that the automatic adjustment of the hardware can be realized, so that the use of the fan is more efficient, and the noise is reduced to a certain extent.

[0048] As a possible implementation manner, the minimum value of the set voltage range is the first set voltage VREF1, and the maximum value of the set voltage range is the second set voltage VREF2.

[0049] The first set voltage VREF1 is the minimum operating voltage of load 110, and the second set voltage VREF2 is the maximum operating voltage of load 110.

[0050] When the voltage value of the third voltage V3 is less than the voltage value of the first set voltage VREF1, the voltage control sub-circuit 2 is disconnected and the load 110 does not work.

[0051] When the voltage value of the third voltage V3 is greater than the voltage value of the second set voltage VREF2, the voltage control sub-circuit 2 outputs the second voltage V2 to the load 110.

[0052] In other words, the voltage control sub-circuit 2 detects the relationship between the voltage value of the third voltage V3 and the magnitudes of the first set voltage VREF1 and the second set voltage VREF2. If the voltage value of the third voltage V3 is within the set voltage range, the voltage control sub-circuit 2 transmits the received first voltage V1 to the fan through the second input terminal. In this way, within the set voltage range, as the temperature rises, the first voltage V1 also rises, the fan power will increase, and the heat dissipation efficiency will be relatively high. This enables automatic hardware adjustment, making the fan more efficient and reducing noise to a certain extent.

[0053] like Figure 2 As shown, as one possible implementation, the temperature detection sub-circuit 1 includes: a first voltage regulator 11, a first voltage divider module 12, and a thermistor RT.

[0054] The input terminal of the first voltage regulator 11 is electrically connected to the input terminal of the temperature detection sub-circuit 1, the output terminal Vin of the first voltage regulator 11 is electrically connected to the output terminal Vout of the temperature detection sub-circuit 1, and is also electrically connected to the first terminal 121 of the first voltage divider module 12; the feedback terminal FB of the first voltage regulator 11 is electrically connected to the second terminal 122 of the first voltage divider module 12.

[0055] The first terminal of the thermistor RT is electrically connected to the third terminal 123 of the first voltage divider module 12, and the second terminal of the thermistor RT is electrically connected to the ground terminal GND.

[0056] The first voltage regulator 11 is configured to output a feedback voltage VFB to the second terminal 122 of the first voltage divider module 12 via the feedback terminal FB.

[0057] The first voltage divider module 12 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is electrically connected to the first end of the first voltage divider module 12, the second end of the first resistor R1 is electrically connected to the second end of the first voltage divider module 12, and is also electrically connected to the first end of the second resistor R2. The second end of the second resistor R2 is electrically connected to the third end of the first voltage divider module 12.

[0058] For example, the feedback voltage VFB output from the feedback terminal FB of the first voltage regulator 11 is the voltage across the second resistor R2 and the thermistor RT. Therefore, when the resistance values ​​of the second resistor R2 and the thermistor RT are fixed, the current of this branch can be calculated. From the current, the voltage across the first resistor R1 can be calculated. Adding the feedback voltage VFB, we get the first voltage V1 output by the temperature detection sub-circuit 1, i.e.:

[0059] (1)

[0060] In some embodiments, the thermistor RT is a negative temperature coefficient (NTC) thermistor RT. The higher the temperature, the lower the resistance of the thermistor RT, and the higher the voltage value of the first voltage V1.

[0061] As one possible implementation, the temperature detection sub-circuit 1 also includes: a first capacitor C1 and a second capacitor C2.

[0062] The first terminal of the first capacitor C1 is electrically connected to the power supply terminal, and the second terminal of the first capacitor C1 is electrically connected to the ground terminal; the first terminal of the second capacitor C2 is electrically connected to the output terminal of the temperature detection sub-circuit 1, and the second terminal of the second capacitor C2 is electrically connected to the ground terminal.

[0063] Among them, the first capacitor C1 and the second capacitor C2 serve as filters and also store charge, so that the voltage remains relatively stable in a short period of time, thereby providing a stable voltage reference.

[0064] like Figure 3 As shown, as one possible implementation, the voltage control sub-circuit 2 includes: a second voltage regulator 21, a voltage supply module 22, a comparison module 23, and a switching module 24.

[0065] The input terminal 220 of the voltage supply module 22 is electrically connected to the first input terminal VESN1 of the voltage control sub-circuit 2; the first output terminal 221 of the voltage supply module 22 is electrically connected to the first input terminal 231 of the comparison module 23; the second output terminal 222 of the voltage supply module 22 is electrically connected to the second input terminal 232 and the fourth input terminal 234 of the comparison module 23; and the third output terminal 223 of the voltage supply module 22 is electrically connected to the third input terminal 233 of the comparison module 23.

[0066] The voltage providing module 22 is configured to generate the third voltage V3 according to the first voltage V1, and transmit the third voltage V3 to the comparison module 23 through the second output end; and configured to output the first setting voltage VREF1 to the comparison module 23 through the first output end, and output the second setting voltage VREF2 to the comparison module 23 through the third output end.

[0067] The control end 24X of the switch module 24 is electrically connected with the first output end 235 of the comparison module 23, the input end 241 of the switch module 24 is electrically connected with the second input end VSEN2 of the voltage control sub-circuit 2, and the output end 242 of the switch module 24 is electrically connected with the output end VSENO of the voltage control sub-circuit 2.

[0068] The control end EN of the second voltage stabilizer 21 is electrically connected with the second output end 236 of the comparison module 23, and the output end Vout of the second voltage stabilizer 21 is electrically connected with the second voltage end VMAX and the output end VSENO of the voltage control sub-circuit 2.

[0069] The comparison module 23 is configured to compare the voltage values of the first voltage V1 and the first setting voltage VREF1, and compare the voltage values of the first voltage V1 and the second setting voltage VREF2; the switch module 24 is configured to be turned on when the first output end of the comparison module 23 outputs the first level, and transmit the first voltage V1 to the output end of the voltage control sub-circuit 2.

[0070] The second voltage stabilizer 21 is configured to work when the second output end of the comparison module 23 outputs the first level, and transmit the second voltage V2 to the load 110 through the second voltage end VMAX.

[0071] That is, the voltage providing module 22 outputs the first setting voltage VREF1, the second setting voltage VREF2 and the third voltage V3, and transmits them to the comparison module for comparison.

[0072] As shown in Figure 3 As a possible implementation, the voltage providing module 22 includes a second voltage dividing module 32, a third voltage dividing module 33 and a fourth voltage dividing module 34.

[0073] The first end of the second voltage dividing module 32 is electrically connected with the first voltage end VIN, the second end of the second voltage dividing module 32 is electrically connected with the first output end 221 of the voltage providing module 22, and the third end of the second voltage dividing module 32 is electrically connected with the ground end.

[0074] The first end of the third voltage dividing module 33 is electrically connected with the input end 220 of the voltage providing module 22, the second end of the third voltage dividing module 33 is electrically connected with the second output end 222 of the voltage providing module 22, and the third end of the third voltage dividing module 33 is electrically connected with the ground end.

[0075] The first end of the fourth voltage dividing module 34 is electrically connected with the first voltage terminal VIN, the second end of the fourth voltage dividing module 34 is electrically connected with the third output terminal 223 of the voltage providing module 22, and the third end of the fourth voltage dividing module 34 is electrically connected with the ground terminal.

[0076] The second voltage dividing module 32 is configured to output a first set voltage VREF1, the third voltage dividing module 33 is configured to output a third voltage V3, and the fourth voltage dividing module 34 is configured to output a second set voltage VREF2.

[0077] In some embodiments, referring to Figure 4 The second voltage dividing module 32 comprises a third resistor R3 and a fourth resistor R4.

[0078] The first end of the third resistor R3 is electrically connected with the first end of the second voltage dividing module 32, the second end of the third resistor R3 is electrically connected with the second end of the second voltage dividing module 32 and the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is electrically connected with the third end of the second voltage dividing module 32.

[0079] The first set voltage VREF1 is the voltage across the fourth resistor R4, that is,

[0080] VREF1=R4 / (R3+R4)*VIN(2)

[0081] The third voltage dividing module 33 comprises a fifth resistor R5 and a sixth resistor R6.

[0082] The first end of the fifth resistor R5 is electrically connected with the first end of the third voltage dividing module 33, the second end of the fifth resistor R5 is electrically connected with the second end of the third voltage dividing module 33 and the first end of the sixth resistor R6, and the second end of the sixth resistor R6 is electrically connected with the third end of the third voltage dividing module 33.

[0083] The third voltage V3 is the voltage across the sixth resistor R6, that is:

[0084] V3=R6 / (R5+R6)*V1(3)

[0085] The formula (3) can be substituted into the formula (1) to calculate.

[0086] The fourth voltage dividing module 34 comprises a seventh resistor R7 and an eighth resistor R8.

[0087] The first end of the seventh resistor R7 is electrically connected with the first end of the fourth voltage dividing module 34, the second end of the seventh resistor R7 is electrically connected with the second end of the fourth voltage dividing module 34 and the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is electrically connected with the third end of the fourth voltage dividing module 34.

[0088] wherein the second set voltage VREF2 refers to the voltage across the eighth resistor R8, i.e.:

[0089] VREF2 = R8 / (R7+R8)*VIN (4)

[0090] As shown in FIG. 3, as one possible implementation, the comparison module 23 comprises a first comparator A1, a second comparator A2, a third comparator A3 and an AND gate. Figure 4 The first end of the first comparator A1 is electrically connected to the first input end of the comparison module 23, and the second end of the first comparator A1 is electrically connected to the second input end of the comparison module 23.

[0091] The first end of the second comparator A2 is electrically connected to the second input end of the comparison module 23, and the second end of the second comparator A2 is electrically connected to the third input end of the comparison module 23.

[0092] The first end of the third comparator A3 is electrically connected to the third input end of the comparison module 23, and the second end of the third comparator A3 is electrically connected to the fourth input end of the comparison module 23.

[0093] The first input end of the AND gate is electrically connected to the output end of the first comparator A1, the second input end of the AND gate is electrically connected to the output end of the second comparator A2, and the output end of the AND gate is electrically connected to the first output end of the comparison module 23.

[0094] wherein the first end of the first comparator A1 is a negative end, and the second end of the first comparator A1 is a positive end; the first end of the second comparator A2 is a negative end, and the second end of the second comparator A2 is a positive end; the first end of the third comparator A3 is a negative end, and the second end of the third comparator A3 is a positive end.

[0095] In the case where the voltage value of the third voltage V3 is greater than the voltage value of the first set voltage VREF1, the first comparator A1 outputs a high level, and in the case where the voltage value of the third voltage V3 is less than the voltage value of the first set voltage VREF1, the first comparator A1 outputs a low level.

[0096] Similarly, in the case where the voltage value of the third voltage V3 is greater than the voltage value of the second set voltage VREF2, the second comparator A2 outputs a low level, and in the case where the voltage value of the third voltage V3 is less than the voltage value of the second set voltage VREF2, the second comparator A2 outputs a high level.

[0097]

[0098] ​Similarly, in the case where the voltage value of the third voltage V3 is greater than the voltage value of the second set voltage VREF2, the third comparator A3 outputs a high level, and in the case where the voltage value of the third voltage V3 is less than the voltage value of the second set voltage VREF2, the third comparator A3 outputs a low level.

[0099] As a possible implementation, the switch module 24 comprises a first transistor Q1, a second transistor Q2, a third transistor Q3, and a ninth resistor R9.

[0100] The control end of the first transistor Q1 is electrically connected with the control end 24X of the switch module 24, the first end of the first transistor Q1 is electrically connected with the second end of the ninth resistor R9, and is also electrically connected with the control end of the second transistor Q2 and the control end of the third transistor Q3; the second end of the first transistor Q1 is electrically connected with the ground end; and the first end of the ninth resistor R9 is electrically connected with the first voltage V1 end.

[0101] The first end of the second transistor Q2 is electrically connected with the input end 241 of the switch module 24, and the first end of the second transistor Q2 is electrically connected with the first end of the third transistor Q3; the second end of the third transistor Q3 is electrically connected with the second end of the switch module 24.

[0102] In some embodiments, the first transistor Q1 is an NPN triode, the second transistor Q2 is a PMOS tube, and the third transistor Q3 is a PMOS tube.

[0103] When the control end 24X of the switch module 24 receives a high level, the first transistor Q1 is turned on. This makes the first end of the first transistor Q1 a low level, so that the control ends of the second transistor Q2 and the third transistor Q3 are low levels, and the second transistor Q2 and the third transistor Q3 are turned on when receiving a low level, so as to transmit the first voltage V1 to the output end 242 through the input end 241 of the switch module 24, thereby supplying power to the load 110.

[0104] When the control end 24X of the switch module 24 receives a low level, the first transistor Q1 is turned off. This makes the first end of the first transistor Q1 a high level, so that the control ends of the second transistor Q2 and the third transistor Q3 are high levels, and the second transistor Q2 and the third transistor Q3 are turned off when receiving a high level, so as to fail to transmit the first voltage V1 to the output end 242 through the input end 241 of the switch module 24, thereby failing to supply power to the load 110.

[0105] In some embodiments, the switch module further comprises a tenth resistor R10.

[0106] The first end of the tenth resistor R10 is electrically connected with the control end 24X of the switch module 24, and the second end of the tenth resistor R10 is electrically connected with the control end of the first transistor Q1.

[0107] As shown in Figure 3 as a possible implementation, the voltage control sub-circuit 2 further includes a fifth voltage dividing module 35.

[0108] The first end of the fifth voltage dividing module 35 is electrically connected with the output end of the second voltage stabilizer 21, the second end of the fifth voltage dividing module 35 is electrically connected with the feedback end of the second voltage stabilizer 21, and the third end of the fifth voltage dividing module 35 is electrically connected with the ground end.

[0109] The fifth voltage dividing module 35 includes an eleventh resistor R11 and a twelfth resistor R12.

[0110] The first end of the eleventh resistor R11 is electrically connected with the first end 351 of the fifth voltage dividing module 35, the second end of the eleventh resistor R11 is electrically connected with the second end 352 of the fifth voltage dividing module 35 and the first end of the twelfth resistor R12, and the second end of the twelfth resistor R12 is electrically connected with the third end 353 of the fifth voltage dividing module 35.

[0111] In some embodiments, the voltage control sub-circuit 2 further includes a third capacitor C3 and a fourth capacitor C4.

[0112] The first end of the third capacitor C3 is electrically connected with the power supply end VIN, and the second end of the third capacitor C3 is electrically connected with the ground end.

[0113] The first end of the fourth capacitor C4 is electrically connected with the output end VSENO of the voltage control sub-circuit 2 and the second voltage end VMAX, and the second end of the fourth capacitor C4 is electrically connected with the ground end.

[0114] The third capacitor C3 and the fourth capacitor C4 play a filtering role and can also play a role of storing electric charge, so that the voltage is relatively stable in a short time, thereby providing a stable voltage reference.

[0115] In some embodiments, the voltage control sub-circuit 2 further includes a thirteenth resistor R13.

[0116] The first end of the thirteenth resistor R13 is electrically connected with the input end Vin of the second voltage stabilizer 21, and the first end of the second end of the thirteenth resistor R13 is electrically connected with the control end EN of the second voltage stabilizer 21.

[0117] The application also provides a car, as shown in Figure 4 The car 200 includes a control circuit 100 and a load 110.

[0118] The automobile 200 reduces noise through a control circuit and can automatically control the output voltage to the load 110. The control circuit 100 detects temperature through a temperature detection sub-circuit 1 and converts the temperature into a first voltage V1, the size of the first voltage V1 representing the size of the temperature, and a voltage control sub-circuit 2 converts the first voltage V1 into a third voltage V3, the size of the third voltage V3 representing the size of the first voltage V1. Finally, the voltage control sub-circuit 2 detects whether the voltage value of the third voltage V3 is within a set voltage range. If the voltage value of the third voltage V3 is within the set voltage range, the voltage control sub-circuit 2 transmits the received first voltage V1 to the fan through a second input end. In this way, within the set voltage range, as the temperature rises, the first voltage V1 also rises, and the power of the fan becomes larger and larger, and the heat dissipation efficiency is relatively high, so that the automatic adjustment of the hardware can be realized, and the use of the fan is more efficient, and noise reduction is achieved to a certain extent.

[0119] The above merely illustrates the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A control circuit, characterized by The application relates to a temperature detection and voltage control circuit. The temperature detection sub-circuit and the voltage control sub-circuit are connected to each other. The input end of the temperature detection sub-circuit is electrically connected to the power supply end, and the output end of the temperature detection sub-circuit is electrically connected to the first input end of the voltage control sub-circuit. The output end of the voltage control sub-circuit is electrically connected to the load. The output end of the temperature detection sub-circuit is electrically connected to the second input end of the voltage control sub-circuit. The temperature detection sub-circuit is configured to generate and output a first voltage according to the detected temperature, and the first voltage increases with the increase of the temperature. The voltage control sub-circuit is configured to receive the first voltage, convert the first voltage into a third voltage, and detect whether the voltage value of the third voltage is within a set voltage range. If yes, the voltage control sub-circuit outputs the first voltage to the load; if no, the voltage control sub-circuit is disconnected or the voltage control sub-circuit outputs a second voltage to the load. The voltage value of the second voltage is greater than or equal to the maximum value of the voltage value of the first voltage.

2. The control circuit of claim 1, wherein, The minimum value of the set voltage range is a first set voltage, and the maximum value of the set voltage range is a second set voltage. The first set voltage is the minimum voltage for the load to work, and the second set voltage is the maximum voltage for the load to work. In the case that the voltage value of the third voltage is less than the voltage value of the first set voltage, the voltage control sub-circuit is disconnected, and the load does not work. In the case that the voltage value of the third voltage is greater than the voltage value of the second set voltage, the voltage control sub-circuit outputs the second voltage to the load.

3. The control circuit of claim 1, wherein, The temperature detection sub-circuit comprises a first voltage stabilizer, a first voltage division module and a thermistor. The input end of the first voltage stabilizer is electrically connected to the input end of the temperature detection sub-circuit, the output end of the first voltage stabilizer is electrically connected to the output end of the temperature detection sub-circuit, and the output end of the first voltage stabilizer is also electrically connected to the first end of the first voltage division module; the feedback end of the first voltage stabilizer is electrically connected to the second end of the first voltage division module. The first end of the thermistor is electrically connected to the third end of the first voltage division module, and the second end of the thermistor is electrically connected to the ground end. The first voltage stabilizer is configured to output a feedback voltage to the second end of the first voltage division module through the feedback end.

4. The control circuit of claim 3, wherein, The first voltage division module comprises a first resistor and a second resistor. The first end of the first resistor is electrically connected to the first end of the first voltage division module, the second end of the first resistor is electrically connected to the second end of the first voltage division module, and the second end of the first resistor is also electrically connected to the first end of the second resistor; the second end of the second resistor is electrically connected to the third end of the first voltage division module.

5. The control circuit of claim 3, wherein, The temperature detection sub-circuit further comprises a first capacitor and a second capacitor. The first end of the first capacitor is electrically connected to the power supply end, and the second end of the first capacitor is electrically connected to the ground end. The first end of the second capacitor is electrically connected to the output end of the temperature detection sub-circuit, and the second end of the second capacitor is electrically connected to the ground end.

6. The control circuit according to any one of claims 1 to 5, characterized by In the case that the set voltage range comprises a first set voltage and a second set voltage, the voltage control sub-circuit comprises a second voltage stabilizer, a voltage providing module, a comparison module and a switch module; The input end of the voltage providing module is electrically connected with the first input end of the voltage control sub-circuit, the first output end of the voltage providing module is electrically connected with the first input end of the comparison module, the second output end of the voltage providing module is electrically connected with the second input end and the fourth input end of the comparison module, and the third output end of the voltage providing module is electrically connected with the third input end of the comparison module; The voltage providing module is configured to generate the third voltage according to the first voltage and transmit the third voltage to the comparison module through the second output end, and is also configured to transmit the first set voltage to the comparison module through the first output end and transmit the second set voltage to the comparison module through the third output end; The control end of the switch module is electrically connected with the first output end of the comparison module, the input end of the switch module is electrically connected with the second input end of the voltage control sub-circuit, and the output end of the switch module is electrically connected with the output end of the voltage control sub-circuit; The control end of the second voltage stabilizer is electrically connected with the second output end of the comparison module, the output end of the second voltage stabilizer is electrically connected with the second voltage end and the output end of the voltage control sub-circuit; The comparison module is configured to compare the voltage values of the first voltage and the first set voltage, and compare the voltage values of the first voltage and the second set voltage; The switch module is configured to be turned on when the first output end of the comparison module outputs a first level and transmit the first voltage to the output end of the voltage control sub-circuit; The second voltage stabilizer is configured to work when the second output end of the comparison module outputs a first level, and the second voltage end transmits the second voltage to the load.

7. The control circuit of claim 6, wherein, The voltage providing module comprises a second voltage dividing module, a third voltage dividing module and a fourth voltage dividing module; The first end of the second voltage dividing module is electrically connected with the first voltage end, the second end of the second voltage dividing module is electrically connected with the first output end of the voltage providing module, and the third end of the second voltage dividing module is electrically connected with the ground end; The first end of the third voltage dividing module is electrically connected with the input end of the voltage providing module, the second end of the third voltage dividing module is electrically connected with the second output end of the voltage providing module, and the third end of the third voltage dividing module is electrically connected with the ground end; The first end of the fourth voltage dividing module is electrically connected with the first voltage end, the second end of the fourth voltage dividing module is electrically connected with the third output end of the voltage providing module, and the third end of the fourth voltage dividing module is electrically connected with the ground end; The second voltage dividing module is configured to output the first set voltage, the third voltage dividing module is configured to output the third voltage, and the fourth voltage dividing module is configured to output the second set voltage.

8. The control circuit according to claim 7, wherein The second voltage dividing module comprises a third resistor and a fourth resistor; a first end of the third resistor is electrically connected with a first end of the second voltage dividing module; a second end of the third resistor is electrically connected with a second end of the second voltage dividing module and a first end of the fourth resistor; a second end of the fourth resistor is electrically connected with a third end of the second voltage dividing module; The third voltage dividing module comprises a fifth resistor and a sixth resistor; a first end of the fifth resistor is electrically connected with a first end of the third voltage dividing module; a second end of the fifth resistor is electrically connected with a second end of the third voltage dividing module and a first end of the sixth resistor; a second end of the sixth resistor is electrically connected with a third end of the third voltage dividing module; The fourth voltage dividing module comprises a seventh resistor and an eighth resistor; a first end of the seventh resistor is electrically connected with a first end of the fourth voltage dividing module; a second end of the seventh resistor is electrically connected with a second end of the fourth voltage dividing module and a first end of the eighth resistor; a second end of the eighth resistor is electrically connected with a third end of the fourth voltage dividing module.

9. The control circuit of claim 7, wherein, The comparison module comprises a first comparator, a second comparator, a third comparator and an AND gate; a first end of the first comparator is electrically connected with a first input end of the comparison module; a second end of the first comparator is electrically connected with a second input end of the comparison module; a first end of the second comparator is electrically connected with the second input end of the comparison module; a second end of the second comparator is electrically connected with a third input end of the comparison module; a first end of the third comparator is electrically connected with the third input end of the comparison module; a second end of the third comparator is electrically connected with a fourth input end of the comparison module; a first input end of the AND gate is electrically connected with an output end of the first comparator; a second input end of the AND gate is electrically connected with an output end of the second comparator; an output end of the AND gate is electrically connected with a first output end of the comparison module.

10. The control circuit of claim 7, wherein, The switch module comprises a first transistor, a second transistor, a third transistor and a ninth resistor; a control end of the first transistor is electrically connected with a control end of the switch module; a first end of the first transistor is electrically connected with a second end of the ninth resistor and a control end of the second transistor and a control end of the third transistor; a second end of the first transistor is electrically connected with the ground end; a first end of the ninth resistor is electrically connected with the first voltage end; a first end of the second transistor is electrically connected with an input end of the switch module; a first end of the second transistor is electrically connected with a first end of the third transistor; a second end of the third transistor is electrically connected with an output end of the switch module.

11. The control circuit of claim 7, wherein, The voltage control sub-circuit further comprises a fifth voltage dividing module; a first end of the fifth voltage dividing module is electrically connected with an output end of the second voltage stabilizer; a second end of the fifth voltage dividing module is electrically connected with a feedback end of the second voltage stabilizer; a third end of the fifth voltage dividing module is electrically connected with the ground end.

12. The control circuit of claim 11, wherein, The voltage control sub-circuit further comprises a third capacitor and a fourth capacitor; A first end of the third capacitor is electrically connected with the power supply end, and a second end of the third capacitor is electrically connected with the ground end. A first end of the fourth capacitor is electrically connected with an output end of the voltage control sub-circuit and the second voltage end, and a second end of the fourth capacitor is electrically connected with the ground end.

13. An automobile characterized by comprising: The automobile comprises the control circuit and the load according to any one of claims 1-12.

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