Fan rotating speed adjusting circuit, power equipment, energy storage system and control method

Abstract

The invention discloses a fan rotating speed adjusting circuit, power equipment, an energy storage system and a control method. The fan rotating speed adjusting circuit comprises a comparison circuit, the input end of the comparison circuit is connected with all device temperature sensors, and the comparison circuit is used for inputting sampling voltages output by all the device temperature sensors, determining the maximum voltage value in the sampling voltages output by all the device temperature sensors and outputting the maximum voltage value to a main control chip; and the main control chip is used for determining the highest temperature detected by the temperature sensors of all the devices according to the maximum voltage value and adjusting the rotating speed of the first fan according to the highest temperature. According to the invention, the problems that the number of I / O ports of the main control chip is insufficient and the computing power of the main control chip is insufficient when the number of the power switch devices detected by the fan rotating speed adjusting circuit is large can be solved, and the requirement on the number of the I / O ports and the requirement on the computing power of the main control chip are reduced.

Description

Technical Field

[0001] The present invention relates to the field of electronic power technology, and in particular to a fan speed regulating circuit, power equipment, energy storage system and control method. Background Art

[0002] Power equipment has a wide range of application scenarios. Inside the power equipment, power switching devices with huge heat generation, such as IGBT, MOSFET, etc., are usually used. The above-mentioned power switching devices are equipped with fans to reduce the temperature of the power switching devices. The main control chip needs to obtain the temperature of the power switching device in order to control the speed of the fan. Since the number of power switching devices is not unique, only the temperature of one power switching device is detected, and the detection result cannot reflect the temperature of all power switching devices. However, if the temperature of multiple power switching devices is detected, the main control chip is required to have multiple I / O ports to receive the temperatures of these power switching devices. When the number of detected power switching devices is large, it will cause the problem of insufficient number of I / O ports of the main control chip, and at the same time, the computing power requirements of the main control chip are also increased.

[0003] In view of the problem that a large number of power switch devices are detected by the fan speed regulation circuit in the prior art, resulting in insufficient number of I / O ports and insufficient computing power of the main control chip, no effective solution has been proposed so far. Summary of the invention

[0004] A fan speed regulation circuit, power equipment, energy storage system and control method are provided in the embodiments of the present invention to solve the problem in the prior art that a large number of power switching devices are detected by the fan speed regulation circuit, resulting in insufficient number of I / O ports of the main control chip and insufficient computing power of the main control chip.

[0005] In order to solve the above technical problems, the present invention provides a fan speed regulating circuit, which is applied to an electric device, wherein the electric device comprises a plurality of power switching devices and a first fan, wherein the first fan is used to dissipate heat for the power switching devices, and the electric device comprises at least two device temperature sensors, which are arranged on different power switching devices. The fan speed regulating circuit comprises:

[0006] A comparison circuit, whose input end is connected to all device temperature sensors, is used to receive the sampled voltages output by all device temperature sensors, determine the maximum voltage value among the sampled voltages output by all device temperature sensors, and output the maximum voltage value to the main control chip;

[0007] The main control chip is used to determine the highest temperature detected by all device temperature sensors according to the maximum voltage value, and adjust the rotation speed of the first fan according to the highest temperature.

[0008] Furthermore, the comparison circuit comprises:

[0009] At least one comparison unit, the comparison unit comprising two input terminals, respectively used to input two sampling voltages, and after the comparison unit determines the larger value of the two sampling voltages, outputs it to the next comparison unit or the main control chip;

[0010] Among them, the two sampling voltages are two sampling voltages corresponding to the outputs of two device temperature sensors, or one sampling voltage output by a comparison unit before the current comparison unit and a sampling voltage output by a device temperature sensor, or two sampling voltages output by two comparison units before the current comparison unit.

[0011] Furthermore, the comparison unit comprises:

[0012] A first operational amplifier, a sampling voltage is input into a non-inverting input terminal thereof;

[0013] a first diode, an anode of which is connected to the output terminal of the first operational amplifier, and a cathode of which is connected to the inverting input terminal of the first operational amplifier;

[0014] A second operational amplifier, a non-inverting input terminal of which inputs another sampling voltage;

[0015] a second diode, an anode of which is connected to the output terminal of the second operational amplifier, and a cathode of which is connected to the inverting input terminal of the second operational amplifier;

[0016] After the cathodes of the first diode and the second diode are connected, they are connected to one of the input terminals of the next comparison unit, or to a main control chip.

[0017] Furthermore, the comparison unit comprises:

[0018] A first operational amplifier, a sampling voltage is input to a non-inverting input terminal thereof, and an output terminal thereof is connected to an inverting input terminal thereof;

[0019] a first diode, an anode of which is connected between the output terminal and the inverting input terminal of the first operational amplifier;

[0020] A second operational amplifier, having a non-inverting input terminal thereof inputting another sampling voltage, and an output terminal thereof connected to its own inverting input terminal;

[0021] a second diode, an anode of which is connected between the output terminal and the inverting input terminal of the second operational amplifier;

[0022] After the cathodes of the first diode and the second diode are connected, they are connected to one of the input terminals of the next comparison unit, or to a main control chip.

[0023] Furthermore, the fan speed adjustment circuit also includes:

[0024] The first amplifier circuit is arranged between the output end of the comparison circuit and the main control chip, and is used for amplifying the maximum voltage value output by the comparison circuit and outputting it to the main control chip.

[0025] Furthermore, the circuit is applied to the power equipment, and a second fan and an ambient temperature sensor are also arranged inside the housing of the power equipment. The ambient temperature sensor is used to detect the ambient temperature inside the power equipment and convert it into a sampling voltage. The fan speed adjustment circuit also includes:

[0026] A second amplifying circuit is provided between the output end of the ambient temperature sensor and the main control chip, and is used for amplifying the sampling voltage output by the ambient temperature sensor and outputting it to the main control chip;

[0027] The main control chip is also used to determine the ambient temperature inside the power equipment according to the sampled voltage output by the ambient temperature sensor, and to control the rotation speed of the second fan according to the ambient temperature.

[0028] The present invention also provides an electric power device, comprising the above-mentioned fan speed regulating circuit.

[0029] The present invention also provides an energy storage system, comprising the above-mentioned electric power equipment.

[0030] The present invention also provides a control method, which is applied to the above-mentioned fan speed adjustment circuit, and the control method includes:

[0031] Receiving the sampled voltages output by the temperature sensors of all devices, and determining the maximum voltage value among the sampled voltages output by the temperature sensors of all devices;

[0032] Determine the highest temperature detected by all device temperature sensors according to the maximum voltage value;

[0033] The rotation speed of the first fan is adjusted according to the maximum temperature; wherein the first fan is used to dissipate heat for the power switch device.

[0034] Further, adjusting the rotation speed of the first fan according to the maximum temperature includes:

[0035] Determining the temperature range in which the maximum temperature is located;

[0036] The rotation speed of the first fan is adjusted according to the temperature range in which the highest temperature is located; wherein, the higher the overall temperature in the temperature range, the higher the corresponding rotation speed.

[0037] Further, adjusting the rotation speed of the first fan according to the temperature range in which the highest temperature is located includes:

[0038] The duty cycle of the first fan driving signal is adjusted according to the temperature range in which the highest temperature is located, thereby adjusting the rotation speed of the first fan.

[0039] Furthermore, the control method further includes:

[0040] Determine the ambient temperature inside the power equipment according to the sampling voltage output by the ambient temperature sensor;

[0041] The rotation speed of the second fan is adjusted according to the ambient temperature; wherein the second fan is arranged inside the housing of the power equipment.

[0042] The present invention also provides a computer-readable storage medium on which a computer program is stored, and the program implements the above control method when executed by a processor.

[0043] The present invention also provides an electronic device, comprising:

[0044] one or more processors;

[0045] The storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned control method.

[0046] By applying the technical solution of the present invention, the sampling voltages output by the temperature sensors of all devices are received through a comparison circuit, and the maximum voltage value among the sampling voltages output by the temperature sensors of all devices is determined and then output to the main control chip. Since the multi-channel sampling voltages only output the maximum voltage value among the sampling voltages output by the temperature sensors of all devices after passing through the comparison circuit, the main control chip only needs one I / O port to receive the maximum voltage value, which can solve the problem of insufficient number of I / O ports of the main control chip. In addition, the comparison process is implemented by the hardware of the comparison circuit. After the comparison is completed, the maximum voltage value among the sampling voltages output by the temperature sensors of all devices is directly output to the main control chip. The main control chip does not need to perform further calculations, thereby avoiding the problem of insufficient computing power of the main control chip. In summary, the present invention can reduce the requirements for the number of I / O ports and computing power of the main control chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a structural diagram of an electric power device according to an embodiment of the present invention;

[0048] Figure 2 is a structural diagram of a fan speed regulating circuit according to an embodiment of the present invention;

[0049] Figure 3 is a structural diagram of a comparison circuit according to an embodiment of the present invention;

[0050] Figure 4 is a structural diagram of a comparison unit according to an embodiment of the present invention;

[0051] Figure 5 is a structural diagram of a comparison unit according to another embodiment of the present invention;

[0052] Figure 6 is a structural diagram of a fan speed regulating circuit according to another embodiment of the present invention;

[0053] Figure 7 is a structural diagram of a first amplifier circuit according to an embodiment of the present invention;

[0054] Figure 8 is a structural diagram of a second amplifier circuit according to an embodiment of the present invention;

[0055] Fig. 9 is a flow chart of a control method according to an embodiment of the present invention;

[0056] Fig.10 is a flow chart of a control method according to another embodiment of the present invention;

[0057] Fig.11 FIG. 4 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0060] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0061] It should be understood that although the terms first, second, third, etc. may be used to describe operational amplifiers in embodiments of the present invention, these operational amplifiers should not be limited to these terms. These terms are only used to distinguish different operational amplifiers. For example, without departing from the scope of embodiments of the present invention, a first operational amplifier may also be referred to as a second operational amplifier, and similarly, a second operational amplifier may also be referred to as a first operational amplifier.

[0062] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0063] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0064] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0065] Example 1

[0066] In some power equipment (such as energy storage converters), fans are installed at the power switch devices to reduce the temperature of the power switch devices. The main control chip needs to obtain the temperature of the power switch device in order to control the speed of the fan. Since the number of power switch devices is not unique, only the temperature of one power switch device is detected, and the detection result cannot reflect the temperature of all power switch devices. However, if the temperature of multiple power switch devices is detected, the main control chip is required to have multiple I / O ports to receive the temperature of these power switch devices. A large number of power switch devices are detected, which will cause the problem of insufficient number of I / O ports of the main control chip, and at the same time, the computing power requirements of the main control chip are also increased.

[0067] Aiming at the problem that the fan speed regulating circuit in the prior art may easily cause insufficient number of I / O ports of the main control chip and insufficient computing power of the main control chip when the number of power switch devices detected is large, this embodiment provides a fan speed regulating circuit, which is applied to power equipment. Figure 1 is a structural diagram of an electric power device according to an embodiment of the present invention, such as Figure 1As shown, the above-mentioned power equipment includes a plurality of power switch devices 1 and a first fan 2, wherein the first fan 2 is used to dissipate heat for the power switch devices 1. The above-mentioned power equipment includes at least two device temperature sensors 3, which are arranged on different power switch devices 1. Figure 2 FIG. 4 is a structural diagram of a fan speed regulating circuit according to an embodiment of the present invention. Figure 2 As shown, the fan speed adjustment circuit includes: a comparison circuit 10, whose input end is connected to all device temperature sensors, and is used to receive the sampled voltages output by all device temperature sensors. It should be noted that if a device temperature sensor fails or malfunctions, the comparison circuit 10 only receives the device temperature sensor in a normal working state. The comparison circuit 10 determines the maximum voltage value among the sampled voltages output by all device temperature sensors, and then outputs the maximum voltage value to the main control chip 20; the main control chip 20 is used to determine the highest temperature among the temperatures detected by all device temperature sensors through A / D conversion according to the maximum voltage value among the sampled voltages output by all device temperature sensors, and adjust the speed of the first fan according to the highest temperature.

[0068] The fan speed regulating circuit of the present embodiment receives the sampled voltages output by all device temperature sensors through the comparison circuit 10, determines the maximum voltage value among the sampled voltages output by all device temperature sensors, and outputs it to the main control chip 20. Since the multiple sampled voltages only output the maximum voltage value among the sampled voltages output by all device temperature sensors after passing through the comparison circuit 10, the main control chip only needs one I / O port to receive the maximum voltage value, which can solve the problem of insufficient number of I / O ports of the main control chip. In addition, the comparison process is implemented by the hardware of the comparison circuit 10. After the comparison is completed, the maximum voltage value among the sampled voltages output by all device temperature sensors is directly output to the main control chip. The main control chip does not need to perform further calculations, thereby avoiding the problem of insufficient computing power of the main control chip. In summary, the present invention can reduce the requirements for the number of I / O ports and computing power of the main control chip.

[0069] Figure 3 is a structural diagram of a comparison circuit according to an embodiment of the present invention, Figure 3 As shown, the comparison circuit includes: at least one comparison unit 101, the comparison unit 101 includes two input terminals, which are respectively used to input two sampling voltages. After the comparison unit 101 determines the larger value of the two sampling voltages, it outputs it to the next comparison unit or the main control chip; wherein the two sampling voltages are two sampling voltages corresponding to the outputs of two device temperature sensors, or one sampling voltage output by a comparison unit before the current comparison unit and one sampling voltage output by a device temperature sensor, or two sampling voltages output by two comparison units before the current comparison unit.

[0070] This embodiment is directed to a situation where the number of device temperature sensors is three. The power switch device in this embodiment takes IGBT as an example, and the number of the corresponding comparison units 101 is two. Figure 2 As shown, the two input ends of the first comparison unit are respectively input with the two sampling voltages IGBT_1 and IGBT_2, and the two input ends of the second comparison unit are respectively input with the larger value of IGBT_1 and IGBT_2 and IGBT_3. After the second comparison unit compares the larger value of IGBT_1 and IGBT_2 with the size of IGBT_3, it outputs the larger value to the main control chip 20.

[0071] In other embodiments of the present invention, a comparison unit may be provided for the case where there are two device temperature sensors to compare the larger value of the sampled voltages of the two device temperature sensors and then output it to the main control chip 20 .

[0072] In other embodiments of the present invention, three comparison units can be set for the case where the number of device temperature sensors is four. The larger values ​​of the sampling voltages of two of the device temperature sensors are compared through the first comparison unit, the larger values ​​of the sampling voltages of the other two device temperature sensors are compared through the second comparison unit, and the larger value of the above two larger values ​​is compared through the third comparison unit, and then output to the main control chip 20.

[0073] In order to compare the magnitudes of two sampled voltages, this example provides a structure of a comparison unit. Figure 4 is a structural diagram of a comparison unit according to an embodiment of the present invention, such as Figure 4 As shown, the comparison unit 101 includes: a first operational amplifier U1, whose non-inverting input terminal inputs a sampling voltage; a first diode D1, whose anode is connected to the output terminal of the first operational amplifier U1, and whose cathode is connected to the inverting input terminal of the first operational amplifier U1; a second operational amplifier U2, whose non-inverting input terminal inputs another sampling voltage; a second diode D2, whose anode is connected to the output terminal of the second operational amplifier U2, and whose cathode is connected to the inverting input terminal of the second operational amplifier U2; after the cathodes of the first diode D1 and the second diode D2 are connected, they are connected to one of the input terminals of the next comparison unit, or the main control chip; the specifications of the first diode D1 and the second diode are the same.

[0074] In order to achieve additional functions such as filtering and current limiting, a first resistor R1 and a first capacitor C2 may be provided at the in-phase input terminal of the first operational amplifier U1, a second resistor R2 may be provided at the output terminal of the first operational amplifier U1, and a second capacitor C2 is provided at the power input terminal of the first operational amplifier U1. The first resistor R1 and the first capacitor C1 together achieve a filtering effect on the voltage input to the first operational amplifier U1, and the second resistor R2 achieves a current limiting effect on the output terminal of the first operational amplifier U1. It should be noted that in one embodiment of the present invention, Figure 3 As shown, the inverting input terminal of the first operational amplifier U1 is connected to the anode of the first diode D1 and between the second resistor R2. In another embodiment of the present invention, the connection point of the inverting input terminal of the first operational amplifier U1 can also be moved forward and connected to between the output terminal of the first operational amplifier U1 and the second resistor R2. The second capacitor C2 is used to filter the power supply voltage of the first operational amplifier U1.

[0075] Similarly, in order to achieve additional functions such as filtering and current limiting, a third resistor R3 and a third capacitor C3 may be provided at the in-phase input terminal of the second operational amplifier U2, a fourth resistor R4 may be provided at the output terminal of the second operational amplifier U2, and a fourth capacitor C4 is provided at the power input terminal of the second operational amplifier U2. The third resistor R3 and the third capacitor C3 together achieve the filtering effect on the voltage input to the second operational amplifier U2, and the fourth resistor R4 achieves the current limiting effect at the output terminal of the second operational amplifier U2. It should be noted that in one embodiment of the present invention, Figure 4 As shown, the inverting input terminal of the second operational amplifier U2 is connected between the anode of the second diode D2 and the fourth resistor R4. In another embodiment of the present invention, the connection point of the inverting input terminal of the second operational amplifier U2 can also be moved forward and connected between the output terminal of the second operational amplifier U2 and the fourth resistor R4. The fourth point capacitor C4 is used to filter the power supply voltage of the second operational amplifier U2.

[0076] like Figure 4 As shown, the output end of the comparison unit is further provided with a fifth resistor R5 and a fifth capacitor C5 , and the fifth resistor R5 and the fifth capacitor C5 together implement the function of filtering the voltage output by the comparison unit 101 .

[0077] The following takes the comparison unit of the sampling voltage IGBT_1 and the sampling voltage IGBT_2 as an example to explain the working principle of the comparison unit: if the voltage of the input signal IGBT_1 is larger, that is, the non-inverting input terminal of the first operational amplifier U1 is larger, IGBT_1>IGBT_2, since the specifications of the first diode D1 and the second diode D2 are the same, the voltage drop across them is the same, the voltage of the cathode of the first diode D1 is greater than the voltage of the cathode of the second diode D2, and then the first diode D1 is turned on, while the second diode D2 is not turned on, the first operational amplifier U1 works in the linear region, with closed-loop negative feedback, satisfying Un1=Un2=Up1=Uo, for the second operational amplifier U2, since the first diode D1 is turned on, Un2=Uo=Up1, because IGBT_1>IGBT_2, so Un2>Up2, the second operational amplifier U2 does not work. The output Uo is IGBT_1, that is, the larger value of IGBT_1 and IGBT_2. Similarly, the larger value of IGBT_1 and IGBT_2 is compared with IGBT_3, and the larger value is output.

[0078] Figure 5 is a structural diagram of a comparison unit according to another embodiment of the present invention, Figure 5 As shown, the comparison unit 101 includes: a first operational amplifier U1, whose non-inverting input terminal inputs a sampling voltage, and whose output terminal is connected to its own inverting input terminal; a first diode D1, whose anode is connected between the output terminal and the inverting input terminal of the first operational amplifier U1; a second operational amplifier U2, whose non-inverting input terminal inputs another sampling voltage, and whose output terminal is connected to its own inverting input terminal; a second diode D2, whose anode is connected between the output terminal and the inverting input terminal of the second operational amplifier U2; after the cathodes of the first diode D1 and the second diode D2 are connected, they are connected to one of the input terminals of the next comparison unit, or the main control chip.

[0079] The principle is the same as the above embodiment. If the voltage of the input signal IGBT_1 is larger, that is, the non-inverting input terminal of the first operational amplifier U1 is larger, IGBT_1>IGBT_2. Since the specifications of the first diode D1 and the second diode D2 are the same, the voltage drop across the two ends is the same. The voltage of the cathode of the first diode D1 is greater than the voltage of the cathode of the second diode D2, thereby making the first diode D1 conductive and the second diode D2 non-conductive. The first operational amplifier U1 works in the linear region with closed-loop negative feedback, satisfying Un1=Un2=Up1=Uo. For the second operational amplifier U2, since the first diode D1 is conductive, Un2=Uo=Up1, because IGBT_1>IGBT_2, so Un2>Up2, the second operational amplifier U2 does not work. The output Uo is IGBT_1, that is, the larger value of IGBT_1 and IGBT_2. Similarly, by comparing the larger value of IGBT_1 and IGBT_2 with IGBT_3, the larger value is output.

[0080] Figure 6 FIG. 1 is a structural diagram of a fan speed regulating circuit according to another embodiment of the present invention. Since the sampling voltage signal output by the device temperature sensor is small, it needs to be amplified before processing. Figure 6 As shown, the fan speed regulating circuit further includes: a first amplifying circuit 30, which is arranged between the output end of the comparison circuit 10 and the main control chip, and is used to amplify the maximum voltage value output by the comparison circuit and output it to the main control chip.

[0081] Figure 7 is a structural diagram of a first amplifier circuit according to an embodiment of the present invention, Figure 7 As shown, the first amplifier circuit includes: a third operational amplifier U3, whose in-phase input terminal inputs the maximum sampling voltage T_L, and the output terminal of the third operational amplifier U3 is connected to its own inverting input terminal. Resistors R6, R7 and capacitors C6, C7 are also arranged in parallel between the in-phase input terminal of the third operational amplifier U3 and the reference ground, the output terminal of the third operational amplifier U3 is also connected to the first end of the eighth resistor R8, the first end of the ninth resistor R9 is connected to the second end of the eighth resistor R8, and the second end of the ninth resistor R9 is grounded, the resistors R6 and R7 are used to adjust the amplification ratio coefficient of the third operational amplifier, the capacitors C6 and C7 are used for filtering, the eighth resistor R8 and the ninth resistor R9 are used for voltage division, and the output terminal of the third operational amplifier U3 outputs the temperature sampling signal OUT_1 of the power switch device amplified according to the ratio.

[0082] The above circuit is applied to the power device. In some embodiments of the present invention, as mentioned above, Figure 1As shown in FIG. 4 , a second fan 5 and an ambient temperature sensor 6 are also provided inside the housing 4 of the power device. The ambient temperature sensor 6 is used to detect the ambient temperature inside the power device and convert it into a sampling voltage. Since the sampling voltage signal output by the ambient temperature sensor is small, it needs to be amplified before processing. Therefore, Figure 5 As shown, the fan speed regulation circuit also includes: a second amplifier circuit 40, which is arranged between the output end of the ambient temperature sensor and the main control chip, and is used to amplify the sampling voltage output by the ambient temperature sensor and output it to the main control chip; the main control chip is also used to determine the ambient temperature inside the power equipment according to the sampling voltage output by the ambient temperature sensor, and control the speed of the second fan according to the ambient temperature.

[0083] Figure 8 is a structural diagram of a second amplifier circuit according to an embodiment of the present invention, Figure 8 As shown, the second amplifier circuit includes: a fourth operational amplifier U4, whose in-phase input terminal inputs the ambient temperature sampling voltage, and the output terminal of the fourth operational amplifier U4 is connected to its own inverting input terminal. Resistors R10, R11 and capacitors C8, C9 are also arranged in parallel between the in-phase input terminal of the fourth operational amplifier U4 and the reference ground, the output terminal of the fourth operational amplifier U4 is also connected to the first end of the resistor R12, the first end of the resistor R13 is connected to the second end of the resistor R12, the second end of the resistor R13 is grounded, the resistors R10 and R11 are used to adjust the amplification ratio coefficient of the fourth operational amplifier, the capacitors C8 and C9 are used for filtering, the resistors R12 and R13 are used for voltage division, and the output terminal of the fourth operational amplifier U3 outputs the ambient temperature sampling signal OUT_2 amplified according to the ratio.

[0084] Example 2

[0085] This embodiment provides an electric power device, including the fan speed regulating circuit of the above embodiment, which is used to solve the problem of insufficient number of I / O ports of the main control chip of the fan speed regulating circuit and insufficient computing power of the main control chip.

[0086] Example 3

[0087] This embodiment provides an energy storage system, including the power equipment of the above embodiment, which is used to solve the problem of insufficient number of I / O ports of the main control chip of the fan speed regulation circuit and insufficient computing power of the main control chip.

[0088] Example 4

[0089] This embodiment provides a control method, which is applied to the fan speed adjustment circuit in the above embodiment. Fig. 9 is a flow chart of a control method according to an embodiment of the present invention, as shown in Fig. 9 As shown, the control method includes:

[0090] S101 , a comparison circuit receives sampled voltages output by all device temperature sensors, and determines a maximum voltage value among the sampled voltages output by all device temperature sensors.

[0091] S102 , the main control chip determines the highest temperature among the temperatures detected by all the device temperature sensors according to the maximum voltage value among the sampled voltages output by all the device temperature sensors.

[0092] S103, the main control chip adjusts the rotation speed of the first fan according to the above-mentioned maximum temperature; wherein the first fan is used to dissipate heat for the power switch device.

[0093] If only the temperature of one power switching device is detected, the detection result cannot reflect the temperature of all power switching devices. Therefore, in this application, multiple device temperature sensors are set. If the average value or a smaller value is taken to control the speed of the cooling fan, the power switching device with the highest temperature may be at risk of damage. By adjusting the speed of the cooling fan with reference to the highest temperature, it can be ensured that all power switches operate below a safe temperature.

[0094] The control method of this embodiment determines the highest temperature among the temperatures detected by all device temperature sensors based on the maximum voltage value among the sampled voltages output by all device temperature sensors, and adjusts the rotation speed of the first fan based on the highest temperature; wherein the first fan is used to dissipate heat for the power switch device, and at the same time refers to the temperatures detected by multiple device temperature sensors, and takes the maximum voltage value to adjust the rotation speed of the cooling fan, which can improve the reliability of the power switch and the entire power equipment.

[0095] In order to match the rotation speed of the cooling fan with the temperature of the power switching device and ensure the safe and stable operation of the power switching device, the rotation speed of the first fan is adjusted according to the maximum temperature, including: determining the temperature range in which the maximum temperature is located; adjusting the rotation speed of the first fan according to the temperature range in which the maximum temperature is located; wherein, the higher the overall temperature within the temperature range, the higher the corresponding rotation speed.

[0096] The speed of the first fan can be controlled by a control signal, and the speed of the first fan is adjusted according to the temperature range where the above-mentioned highest temperature is located, including: adjusting the duty cycle of the driving signal of the first fan according to the temperature range where the above-mentioned highest temperature is located, thereby adjusting the speed of the first fan.

[0097] In some power equipment, a second fan and an ambient temperature sensor are also arranged inside the shell. The ambient temperature sensor is used to detect the ambient temperature inside the power equipment and convert it into a sampling voltage. In order to control the rotation speed of the second fan arranged inside the shell of the power equipment to ensure the heat dissipation effect inside the shell of the power equipment, the above-mentioned control method also includes: determining the ambient temperature inside the power equipment according to the sampling voltage output by the ambient temperature sensor; adjusting the rotation speed of the second fan according to the ambient temperature; wherein the second fan is arranged inside the shell of the power equipment; wherein, the higher the ambient temperature, the higher the rotation speed of the second fan.

[0098] Example 5

[0099] This embodiment provides another control method, which is applied to the fan speed adjustment circuit in the above embodiment. Fig.10 is a flow chart of a control method according to another embodiment of the present invention, Fig.10 As shown, the control method includes:

[0100] S1, obtaining in real time the maximum voltage value Tmax of the sampled voltages of all device temperature sensors and the ambient temperature T obtained by the ambient temperature sensor, and then executing steps S2 and S6 respectively.

[0101] S2, determine the interval of the maximum voltage value Tmax in the sampling voltages of all device temperature sensors; if Tmax<Tg1, execute step S3; if Tg1≤Tmax≤Tg2, execute step S4; if Tmax>tg2, execute step S5.

[0102] S3, adjusting the duty cycle of the driving signal of the first fan to a first preset value, thereby controlling the first fan to run at a first preset speed.

[0103] S4, adjusting the duty cycle of the driving signal of the first fan to a second preset value, thereby controlling the first fan to run at a second preset speed.

[0104] S5, adjusting the duty cycle of the driving signal of the first fan to a third preset value, thereby controlling the first fan to run at a third preset speed.

[0105] S6, determine the temperature range of the ambient temperature T; if T<Te1, execute step S7; if Te1≤T≤Te2, execute step S8; if T>Te2, execute step S9.

[0106] S7, adjusting the duty cycle of the driving signal of the second fan to a fourth preset value, thereby controlling the second fan to run at a fourth preset speed.

[0107] S8, adjusting the duty cycle of the driving signal of the second fan to a fifth preset value, thereby controlling the second fan to run at a fifth preset speed.

[0108] S9, adjusting the duty cycle of the driving signal of the second fan to a sixth preset value, thereby controlling the second fan to run at a sixth preset speed.

[0109] First, a sampling voltage is obtained through multiple temperature sensors (thermistors), and three voltage signals are transmitted to the comparison circuit to obtain the maximum voltage value T_L among the sampling voltages of multiple temperature sensors. Then, the maximum voltage value among the sampling voltages of multiple temperature sensors is input into the first amplifier circuit, and the output signal OUT_1 is obtained by adjusting the proportional coefficient, filtering and appropriate voltage division. Then, the output signal of the operational amplifier is sent to the main control chip 20, and the maximum temperature value Tmax of the power switch device is obtained through A / D conversion, and the relationship between it and the threshold values ​​Tg1 and Tg2 is compared by software design through the I / O input of the chip, so as to obtain different PWM duty cycle pulse outputs and control the speed of the first fan (the fan for cooling the power switch device).

[0110] At the same time, the sampling voltage of the ambient temperature is obtained, OUT_2 is obtained through the second amplifier circuit, and sent to the main control chip 20. After A / D conversion, the ambient temperature T is obtained. The software determines the relationship between the ambient temperature T and the thresholds Te1 and Te2, and outputs the corresponding PWM duty cycle pulse to control the speed of the second fan (internal circulation fan). So far, an adaptive fan speed control method for power equipment is provided.

[0111] Example 6

[0112] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the control method of the above embodiment is implemented.

[0113] Example 7

[0114] This embodiment provides an electronic device, including:

[0115] one or more processors;

[0116] The storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the above embodiment.

[0117] Fig.11 FIG. 1 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Fig.10 As shown, the device includes:

[0118] One or more processors 1110 and memory 1020, Fig.11 A processor 1110 is taken as an example.

[0119] The electronic device may further include: an input device 1130 and an output device 1140 .

[0120] The processor 1110, the memory 1120, the input device 1130 and the output device 1140 may be connected via a bus or other means. Fig.11 The example of connecting through bus is taken in the following.

[0121] The memory 1120 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the control method in the embodiment of the present invention. The processor 1110 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 1120, that is, implementing the above method embodiment.

[0122] The memory 1120 may include a program storage area and a data storage area, wherein the program storage area may store an application required for operating the device and at least one function; the data storage area may store data created according to the use of the control method, etc. In addition, the memory 1120 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0123] The input device 1130 may receive input digital or character information and generate key signal input related to user settings and function control of the electronic device. The output device 1140 may include a display device such as a display screen.

[0124] The one or more modules are stored in the memory 1120, and when executed by the one or more processors 1110, the control method in any of the above method embodiments is executed.

[0125] The electronic device can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0126] The electronic device of the embodiment of the present invention exists in various forms, including but not limited to:

[0127] (1) Mobile communication devices: These devices are characterized by their mobile communication functions and their main purpose is to provide voice and data communications. These terminals include: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones.

[0128] (2) Ultra-mobile personal computer devices: These devices fall into the category of personal computers, have computing and processing capabilities, and generally also have mobile Internet access features. These terminals include: PDA, MID and UMPC devices, such as iPad.

[0129] (3) Portable entertainment devices: These devices can display and play multimedia content. They include audio and video players (such as iPods), handheld game consoles, e-books, smart toys, and portable car navigation devices.

[0130] (4) Server: A device that provides computing services. The server consists of a processor, hard disk, memory, device bus, etc. The server is similar to a general computer architecture, but because it needs to provide highly reliable services, it has higher requirements in terms of processing power, stability, reliability, security, scalability, and manageability.

[0131] (5) Other electronic devices with data interaction functions, such as televisions, large-screen cars, etc.

[0132] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0133] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fan speed regulating circuit is applied to an electric device, wherein the electric device comprises a plurality of power switching devices and a first fan, wherein the first fan is used to dissipate heat for the power switching devices, and the electric device comprises at least two device temperature sensors, which are arranged on different power switching devices, and wherein: The circuit comprises: A comparison circuit, whose input end is connected to all device temperature sensors, is used to receive the sampled voltages output by all device temperature sensors, determine the maximum voltage value among the sampled voltages output by all device temperature sensors, and output the maximum voltage value to the main control chip; The main control chip is used to determine the highest temperature detected by all device temperature sensors according to the maximum voltage value, and adjust the rotation speed of the first fan according to the highest temperature.

2. The circuit according to claim 1, characterized in that The comparison circuit comprises: At least one comparison unit, the comparison unit comprising two input terminals, respectively used to input two sampling voltages, and after the comparison unit determines the larger value of the two sampling voltages, outputs it to the next comparison unit or the main control chip; Among them, the two sampling voltages are two sampling voltages corresponding to the outputs of two device temperature sensors, or one sampling voltage output by a comparison unit before the current comparison unit and a sampling voltage output by a device temperature sensor, or two sampling voltages output by two comparison units before the current comparison unit.

3. The circuit according to claim 2, characterized in that The comparison unit comprises: A first operational amplifier, a sampling voltage is input into a non-inverting input terminal thereof; a first diode, an anode of which is connected to the output terminal of the first operational amplifier, and a cathode of which is connected to the inverting input terminal of the first operational amplifier; A second operational amplifier, a non-inverting input terminal of which inputs another sampling voltage; a second diode, an anode of which is connected to the output terminal of the second operational amplifier, and a cathode of which is connected to the inverting input terminal of the second operational amplifier; After the cathodes of the first diode and the second diode are connected, they are connected to one of the input terminals of the next comparison unit, or to a main control chip.

4. The circuit according to claim 2, characterized in that The comparison unit comprises: A first operational amplifier, a sampling voltage is input to a non-inverting input terminal thereof, and an output terminal thereof is connected to an inverting input terminal thereof; a first diode, an anode of which is connected between the output terminal and the inverting input terminal of the first operational amplifier; A second operational amplifier, having a non-inverting input terminal thereof inputting another sampling voltage, and an output terminal thereof connected to its own inverting input terminal; a second diode, an anode of which is connected between the output terminal and the inverting input terminal of the second operational amplifier; After the cathodes of the first diode and the second diode are connected, they are connected to one of the input terminals of the next comparison unit, or to a main control chip.

5. The circuit according to claim 1, characterized in that The fan speed regulating circuit also includes: The first amplifier circuit is arranged between the output end of the comparison circuit and the main control chip, and is used for amplifying the maximum voltage value output by the comparison circuit and outputting it to the main control chip.

6. The circuit according to claim 1, characterized in that The circuit is applied to the power equipment. A second fan and an ambient temperature sensor are also arranged inside the housing of the power equipment. The ambient temperature sensor is used to detect the ambient temperature inside the power equipment and convert it into a sampling voltage. The fan speed adjustment circuit also includes: A second amplifying circuit is provided between the output end of the ambient temperature sensor and the main control chip, and is used for amplifying the sampling voltage output by the ambient temperature sensor and outputting it to the main control chip; The main control chip is also used to determine the ambient temperature inside the power equipment according to the sampled voltage output by the ambient temperature sensor, and to control the rotation speed of the second fan according to the ambient temperature.

7. An electric power device, characterized in that: The fan speed regulating circuit comprises the fan speed regulating circuit according to any one of claims 1 to 6.

8. An energy storage system, characterized in that: Comprising the electric power equipment as claimed in claim 7.

9. A control method, applied to the fan speed regulating circuit according to any one of claims 1 to 6, characterized in that: The control method comprises: Receiving the sampled voltages output by the temperature sensors of all devices, and determining the maximum voltage value among the sampled voltages output by the temperature sensors of all devices; Determine the highest temperature detected by all device temperature sensors according to the maximum voltage value; The rotation speed of the first fan is adjusted according to the maximum temperature; wherein the first fan is used to dissipate heat for the power switch device.

10. The control method according to claim 9, characterized in that: Adjusting the rotation speed of the first fan according to the maximum temperature includes: Determining the temperature range in which the maximum temperature is located; The rotation speed of the first fan is adjusted according to the temperature range in which the highest temperature is located; wherein, the higher the overall temperature in the temperature range, the higher the corresponding rotation speed.

11. The control method according to claim 10, characterized in that: Adjusting the rotation speed of the first fan according to the temperature range in which the highest temperature is located includes: The duty cycle of the first fan driving signal is adjusted according to the temperature range in which the highest temperature is located, thereby adjusting the rotation speed of the first fan.

12. The control method according to claim 9, characterized in that: The control method further comprises: Determine the ambient temperature inside the power equipment according to the sampling voltage output by the ambient temperature sensor; The rotation speed of the second fan is adjusted according to the ambient temperature; wherein the second fan is arranged inside the housing of the power equipment.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 9 to 12 is implemented.

14. An electronic device, characterized in that: include: one or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, enables the one or more processors to implement the method according to any one of claims 9 to 12.

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