Temperature control circuit and satellite platform

Abstract

The utility model discloses a temperature control circuit and a satellite platform. The temperature control circuit comprises a control module, at least one temperature acquisition module and at least one switch module. The temperature acquisition module and the switch module are arranged corresponding to the single machine; the temperature acquisition module is used for acquiring the temperature value of the corresponding single machine; the input end of the control module is connected with the temperature acquisition module, the output end of the control module is connected with the control end of the switch module, and the control module is used for outputting a first control signal when the temperature value is smaller than a first set value and outputting a second control signal when the temperature value is larger than a second set value; the switch module is used for being switched on according to the first control signal to heat the corresponding single machine, or being switched off according to the second control signal to stop heating the corresponding single machine; wherein the switch module comprises at least one N-channel switch tube. According to the utility model, switching loss can be reduced, resource waste is reduced, and satellite finishing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of satellite thermal control, in particular to a temperature control circuit and a satellite platform. Background Art

[0002] In order to meet the requirements of satellite's on-orbit performance, reliability, safety, lifespan, etc., the temperature-sensitive parts inside the satellite need to be heated and temperature-controlled to ensure that the individual units in the satellite operate within the appropriate temperature range.

[0003] The temperature control circuit of a single device in the prior art has the problem of high switching loss. Utility Model Content

[0004] The utility model provides a temperature control circuit and a satellite platform, which can reduce switching loss, reduce resource waste, and improve the efficiency of the entire satellite.

[0005] In a first aspect, the utility model provides a temperature control circuit for controlling the temperature of a single machine in a satellite platform. The temperature control circuit includes: a control module, at least one temperature acquisition module and at least one switch module; the temperature acquisition module is connected to the corresponding single machine and is used to collect the temperature value of the corresponding single machine; the input end of the control module is connected to the temperature acquisition module, and the output end of the control module is connected to the control end of the switch module. The control module is used to output a first control signal when the temperature value is less than a first set value, and output a second control signal when the temperature value is greater than a second set value; wherein the second set value is greater than the first set value; the first end of the switch module is grounded, and the second end of the switch module is connected to the corresponding single machine, and is used to be turned on according to the first control signal to heat the corresponding single machine, or turned off according to the second control signal to stop heating the corresponding single machine; wherein the switch module includes at least one N-channel switch tube.

[0006] Optionally, a heating belt is provided in the single machine, and the heating belt is connected in series with the switch module. The switch module includes N NMOS tubes connected in series; N is an integer greater than or equal to 2.

[0007] Optionally, the temperature control circuit also includes at least one switch state detection module; the first end of the switch state detection module is connected to the second end of the corresponding switch module, the second end of the switch state detection module is grounded, and the third end of the switch state detection module is connected to the control module, and the control module is used to determine the conduction state of the switch module according to the voltage output by the switch state detection module.

[0008] Optionally, the switch state detection module includes a first resistor and a second resistor; the first end of the first resistor serves as the first end of the switch state detection module, the second end of the first resistor is connected to the first end of the second resistor and serves as the third end of the switch state detection module, and the second end of the second resistor serves as the second end of the switch state detection module.

[0009] Optionally, the temperature acquisition module includes a thermistor, a third resistor and a fourth resistor; the first end of the thermistor is connected to the corresponding single machine and the first end of the third resistor, the second end of the thermistor is grounded, and the second end of the third resistor is connected to the input end of the control module; the first end of the fourth resistor is connected to the first end of the third resistor, and the second end of the fourth resistor is connected to the second voltage.

[0010] Optionally, the temperature acquisition module also includes a first capacitor and a second capacitor; the first end of the first capacitor is connected to the second end of the third resistor, the second end of the first capacitor is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the second end of the thermistor.

[0011] Optionally, the temperature control circuit further includes a satellite computer, which is in communication with the control module and is configured to receive temperature information about each unit fed back by the control module and issue control instructions to the control module.

[0012] Optionally, the temperature control circuit further includes a power supply module, which is used to supply power to the control module and the switch module.

[0013] Optionally, the first set value is 15°C and the second set value is 18°C.

[0014] In a second aspect, the present invention provides a satellite platform, comprising the temperature control circuit provided by any embodiment of the present invention.

[0015] The temperature control circuit provided in the embodiment of the present invention includes a control module, at least one temperature acquisition module and at least one switch module. By setting the switch module to include at least one N-channel switch tube, switching losses can be reduced, resource waste can be reduced, and the efficiency of the entire satellite can be improved.

[0016] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 This is a structural diagram of a temperature control circuit provided by the utility model;

[0019] Figure 2 This is a structural diagram of another temperature control circuit provided by the present utility model;

[0020] Figure 3 This is a structural diagram of another temperature control circuit provided by the present utility model;

[0021] Figure 4 This is a structural diagram of another temperature control circuit provided by the present utility model;

[0022] Figure 5 This is a structural diagram of another temperature control circuit provided by the present utility model;

[0023] Figure 6 This is a structural diagram of another temperature control circuit provided by the present utility model;

[0024] Figure 7 This is a structural diagram of another temperature control circuit provided by the utility model. DETAILED DESCRIPTION

[0025] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar items and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0027] Figure 1 This is a schematic diagram of the structure of a temperature control circuit provided by the present invention. Figure 1 As shown, the temperature control circuit 1 is used to control the temperature of a single unit 2 in a satellite platform. The temperature control circuit 1 includes: a control module 11 , at least one temperature acquisition module 12 and at least one switch module 13 .

[0028] The temperature acquisition module 12 is connected to the corresponding single machine 2 and is used to collect the temperature value of the corresponding single machine 2.

[0029] The input end of the control module 11 is connected to the temperature acquisition module 12, and the output end of the control module 11 is connected to the control end of the switch module 13. The control module 11 is configured to output a first control signal when the temperature value is less than a first set value, and output a second control signal when the temperature value is greater than a second set value. The second set value is greater than the first set value.

[0030] The first end of the switch module 13 is grounded, and the second end of the switch module 13 is connected to the corresponding single unit, and is used to be turned on according to a first control signal to heat the corresponding single unit 2, or turned off according to a second control signal to stop heating the corresponding single unit 2; wherein, the switch module 13 includes at least one N-channel switch tube.

[0031] Optionally, the control module 11 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. If it is a general-purpose processor, it may be a microprocessor or any conventional processor.

[0032] The temperature acquisition module 12 is used to acquire temperature data from the unit 2. Optionally, the temperature acquisition module 12 includes temperature-sensitive components, such as thermistors. It is closely connected to the unit 2 and can sense temperature changes in the unit 2. It converts this temperature information into a voltage signal (e.g., a voltage value) and transmits it to the control module 11. For example, a thermistor's resistance changes with temperature. By forming a voltage divider circuit with other resistors, the temperature change can be converted into a voltage change.

[0033] The switch module 13 includes at least one N-channel switch tube, whose main function is to control the on / off of the heating circuit of the single unit 2 according to the signal of the control module 11. The N-channel switch tube, such as the N-channel MOSFET, is connected between the drain and the source when the gate voltage is higher than a certain value of the source, and is turned off otherwise. The current in the N-channel switch tube is conducted by electrons, and the high electron mobility makes it respond quickly to the gate signal, the switching speed is faster, and the transition time is short, thereby reducing the switching loss; its on-resistance is usually small, and under the same current, according to the power loss formula (P=I 2 R, where P is power loss, I is current, and R is on-resistance). It can be seen that the power loss generated is small.

[0034] The stand-alone device 2 is an independent device in a satellite platform. The normal operation of this device requires a suitable temperature range, so the temperature control circuit 1 is required to regulate its temperature. For example, a communication device or electronic instrument on a satellite.

[0035] Optionally, the first control signal and the second control signal are high-level and low-level signals, respectively. Exemplarily, the first control signal is a high-level signal, and the second control signal is a low-level signal.

[0036] Optionally, the device for heating the unit 2 may be a heating belt 21 , the second end of the switch module is connected to the first end of the heating belt 21 in the corresponding unit 2 , and the second end of the heating belt 21 is connected to the first voltage VCC1 .

[0037] Continue to refer Figure 1 , the working principle of the temperature control circuit is:

[0038] The thermistor in the temperature acquisition module 12 is in contact with the single device 2. When the temperature of the single device 2 changes, the resistance of the thermistor changes accordingly, and a voltage signal is generated.

[0039] After receiving the voltage signal from the temperature acquisition module 12, the control module 11 converts it into a corresponding temperature value. When the temperature value is less than the first set value, the control module 11 outputs a first control signal; when the temperature value is greater than the second set value, the control module outputs a second control signal. For example, if the first set value is 15°C and the second set value is 18°C, the control module 11 outputs the first control signal when the acquired temperature value is 13°C, and the second control signal when the acquired temperature value is 20°C.

[0040] The control terminal of switch module 13 receives signals from control module 11. When control module 11 outputs a first control signal, the first control signal causes the gate-source voltage of the N-channel switch tube to exceed its turn-on voltage, turning on the N-channel switch tube. At this point, current flows from the power supply (used to generate the first voltage VCC1) through heating belt 21, through the turned-on switch tube, and to ground. Heating belt 21 begins to operate, and the temperature of unit 2 rises. When control module 11 outputs a second control signal, the gate-source voltage of the switch tube falls below the turn-on voltage, turning off the switch tube. No current flows through heating belt 21, and unit 2 stops heating.

[0041] The temperature control circuit provided in the embodiment of the present invention includes a control module, at least one temperature acquisition module and at least one switch module. By setting the switch module to include at least one N-channel switch tube, switching losses can be reduced, resource waste can be reduced, and the efficiency of the entire satellite can be improved.

[0042] Figure 2 This is a schematic diagram of the structure of another temperature control circuit provided by the embodiment of the present utility model. Figure 2 As shown, a heating belt 21 is provided in the single machine 2. The heating belt 21 is connected in series with the switch module 13. The switch module 13 includes N NMOS transistors T1 connected in series. N is an integer greater than or equal to 2.

[0043] Specifically, the gate of the NMOS transistor T1 serves as the control end of the switch module 13, the first electrode of the first NMOS transistor T1 is grounded, the second electrode of the i-th NMOS transistor T1 is connected to the first electrode of the (i+1)-th NMOS transistor T1, and the second electrode of the last NMOS transistor T1 is connected to the first end of the heating belt 21 in the single machine 2, and the second end of the heating belt 21 is connected to the first voltage VCC1; i is an integer greater than or equal to 1 and less than N.

[0044] When multiple NMOS transistors T1 are connected in series, even if one of the NMOS transistors T1 fails (for example, due to a short circuit or performance degradation caused by overheating, electrostatic discharge, or manufacturing defects), the other normal NMOS transistors T1 can still limit the current path to a certain extent, thereby preventing the entire temperature control circuit 1 from completely losing control. For example, if one of the NMOS transistors T1 has a short circuit failure, if it is a single MOS transistor, then the heating belt 21 will always be in the energized heating state, which may cause the temperature of the single unit to be too high and damaged. However, if multiple NMOS transistors T1 are connected in series, the remaining normal NMOS transistors T1 can prevent excessive current from passing through, reducing the impact of the failure on the temperature control of the single unit, playing a role similar to redundant backup, and improving the reliability of the entire temperature control circuit.

[0045] Secondly, for the series-connected NMOS transistor T1 structure, due to the unidirectional conductivity of the NMOS transistor T1 itself, connecting multiple NMOS transistors T1 in series can enhance the effect of this unidirectional conductivity. Under normal circumstances, when the control module 11 outputs the first control signal to turn on the NMOS transistor T1, the current flows from the first voltage VCC1 through the heating belt 21, and then flows to the ground through the series-connected NMOS transistors T1 in sequence. When some abnormal conditions occur, such as power supply fluctuations or external interference causing voltage reversal, the series-connected NMOS transistors T1 act like checkpoints, effectively blocking the passage of reverse current and preventing current from flowing back into other circuit parts, thereby protecting other sensitive components in the temperature control circuit 2 from damage by reverse current. This feature of preventing current backflow also helps maintain the stability and normal function of the circuit, further improving the reliability of the circuit.

[0046] Figure 3 This is a schematic diagram of the structure of another temperature control circuit provided by the embodiment of the present utility model. Figure 3 As shown, optionally, the temperature control circuit 1 further includes at least one switch state detection module 14 .

[0047] A first end of the switch state detection module 14 is connected to the second end of the corresponding switch module 13, a second end of the switch state detection module 14 is grounded, and a third end of the switch state detection module 14 is connected to the control module. The control module 11 is used to determine the conduction state of the switch module 13 according to the voltage output by the switch state detection module.

[0048] Specifically, when the switch module 13 is turned on, current flows from the heating belt 21 through the switch module 13, and a portion of the current flows to the ground through the switch state detection module 14. The control module 11 can determine the conduction status of the switch module 13 by detecting this portion of current or related electrical parameters (such as voltage).

[0049] For example, if the switch state detection module 14 is a voltage divider circuit composed of resistors, when the switch module 13 is turned off, a certain voltage drop will be generated across the resistors. The control module 11 can infer that the switch module 13 is turned off based on this voltage drop. If the switch module 13 is turned on and no current flows, there will be no voltage drop across the resistors or the voltage drop will be zero, and the control module 11 can determine that the switch module 13 is in the off state. This detection method can provide important feedback information for the entire temperature control circuit 2. For example, the control module 11 can determine whether the heating process is proceeding normally based on the information fed back by the switch state detection module 14, whether there is a malfunction of the switch module 13 (such as it should be turned on but is not, or it should be turned off but is accidentally turned on), etc.

[0050] As an optional implementation provided in this embodiment, Figure 4 This is a schematic diagram of the structure of another temperature control circuit provided by the embodiment of the present utility model, combined with Figure 3 and Figure 4 The switch state detection module 14 includes a first resistor R1 and a second resistor R2.

[0051] The first end of the first resistor R1 serves as the first end of the switch state detection module 14 , the second end of the first resistor R1 is connected to the first end of the second resistor R2 and serves as the third end of the switch state detection module 14 , and the second end of the second resistor R2 serves as the second end of the switch state detection module 14 .

[0052] Specifically, when the switch module 13 is turned off, current flows from the heating belt 21 into the first resistor R1. According to Ohm's law, when current flows, a voltage drop will be generated across the first resistor R1 and the second resistor R2.

[0053] Since the input voltage is the first voltage VCC1, the first voltage VCC1 is conducted by the heating belt 21. In the voltage divider circuit composed of the first resistor R1 and the second resistor R2, the voltage VCC1 at the voltage divider point (i.e., the connection point between the first resistor R1 and the second resistor R2) isout It can be calculated by the following formula:

[0054]

[0055] Here, r1 represents the resistance value of the first resistor R1, and r2 represents the resistance value of the second resistor R2.

[0056] That is, when the switch module 13 is turned off, the voltage value of the voltage dividing point is not 0, and this voltage value can be detected. That is, if the control module 11 detects an expected non-zero voltage, it can be determined that the switch module 13 is in the off state.

[0057] When the switch module 13 is on, no current flows through the first resistor R1, and the voltage at the voltage divider is zero, indicating that the switch module 13 is on. This method of determining the on-state of the switch module by detecting the voltage at the voltage divider is simple and effective, providing an intuitive means of monitoring the switch state of the entire temperature control circuit.

[0058] Figure 5 This is a schematic diagram of the structure of another temperature control circuit provided by the embodiment of the present utility model. Figure 5 As shown, the temperature acquisition module 12 optionally includes a thermistor TH1, a third resistor R3, and a fourth resistor R4. The first end of the thermistor TH1 is connected to the corresponding single device 2 and the first end of the third resistor R3, the second end of the thermistor TH1 is grounded, and the second end of the third resistor R3 is connected to the input end of the control module 11; the first end of the fourth resistor R4 is connected to the first end of the third resistor R3, and the second end of the fourth resistor R4 is connected to the second voltage VVC2.

[0059] Optionally, continue to refer to Figure 5 The temperature acquisition module 12 also includes a first capacitor C1 and a second capacitor C2. The first end of the first capacitor C1 is connected to the second end of the third resistor R3, the second end of the first capacitor C1 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is connected to the second end of the thermistor TH1. The first capacitor C1 and the second capacitor C2 are filter capacitors.

[0060] Figure 6 This is a schematic diagram of the structure of another temperature control circuit provided by the embodiment of the present utility model. Figure 6 As shown, optionally, the temperature control circuit 1 further includes a satellite service computer 15 , which is in communication with the control module 11 , and is configured to receive temperature information about each unit 2 fed back by the control module 11 , and issue control instructions to the control module 11 .

[0061] Specifically, the star computer 15 is in communication connection with the control module 11 and can receive the temperature information of each single machine 2 fed back by the control module 11. For example, in a satellite platform containing multiple single machines 2 with different functions, the star computer 15 can know the real-time temperatures of the communication single machine, the remote sensing single machine and other different single machines at the same time, thereby providing a basis for subsequent overall regulation and analysis.

[0062] The star computer 15 can also issue control instructions to the control module 11. Based on the received temperature information, it can make a judgment according to a preset temperature control strategy or algorithm, and then instruct the control module 11 to take corresponding actions. For example, when the temperature of a certain single machine 2 approaches a dangerous high-temperature threshold, the star computer 15 can issue an instruction to make the control module 11 adjust the relevant parameters to prompt the switch module 13 to turn off faster and stop heating the single machine 2; or when the temperature of the single machine 2 is too low, the star computer 15 can instruct the control module 11 to increase the heating duration.

[0063] Optionally, with reference to Figure 6 , the temperature control circuit 1 further comprises a power supply module 16 for supplying power to the control module 11 and the switch module 13.

[0064] Specifically, the power supply module 16 is the energy source for the normal operation of the entire temperature control circuit 1. It is responsible for supplying power to the control module 11 and the switch module 13, so as to ensure that these two key modules have sufficient electrical energy to complete their respective functions. For the control module 11, electrical energy is needed to run the internal processing program, compare the temperature value with the set value, and generate a corresponding control signal, etc. The switch module 13 relies on the electrical energy provided by the power supply module 16 to normally realize conduction or turn-off after receiving the control signal, thereby controlling whether the single machine 2 is heated or not. For example, the power supply module 16 can use battery or solar power converted electrical energy to deliver to the control module 11 and the switch module 13 with appropriate voltage and current values, so as to maintain the stable operation of the entire temperature control circuit 1 and ensure that the temperature of the single machine 2 is always within the appropriate range.

[0065] Figure 7 is another structural schematic view of a temperature control circuit provided by the embodiment of the present application. As shown in Figure 7 , the temperature control circuit 1 comprises: a control module 11, at least one temperature acquisition module 12 and at least one switch module 13. Optionally, the switch module 13 comprises N NMOS tubes T1. The temperature control circuit 1 further comprises at least one switch state detection module 14. The switch state detection module 14 comprises a first resistor R1 and a second resistor R2. Optionally, the temperature acquisition module 12 comprises a thermistor TH1, a third resistor R3 and a fourth resistor R4. The temperature acquisition module 12 further comprises a first capacitor C1 and a second capacitor C2. The temperature control circuit 1 further comprises a star computer 15.

[0066] Based on the same utility model concept, the utility model also provides a satellite platform, including the temperature control circuit provided by any embodiment of the utility model, and having the corresponding functional modules and beneficial effects of the backlight module, which will not be repeated here.

[0067] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A temperature control circuit, characterized in that: Used to control the temperature of a single unit in a satellite platform, the temperature control circuit includes: a control module, at least one temperature acquisition module and at least one switch module; The temperature acquisition module is connected to the corresponding single machine and is used to collect the temperature value of the corresponding single machine; The input end of the control module is connected to the temperature acquisition module, and the output end of the control module is connected to the control end of the switch module. The control module is configured to output a first control signal when the temperature value is less than a first set value, and output a second control signal when the temperature value is greater than a second set value; wherein the second set value is greater than the first set value; The first end of the switch module is grounded, and the second end of the switch module is connected to the corresponding single machine, and is configured to be turned on according to the first control signal to heat the corresponding single machine, or turned off according to the second control signal to stop heating the corresponding single machine; wherein the switch module includes at least one N-channel switch tube.

2. The temperature control circuit according to claim 1, characterized in that: The single machine is provided with a heating belt, which is connected in series with the switch module. The switch module includes N NMOS tubes connected in series; N is an integer greater than or equal to 2.

3. The temperature control circuit according to claim 1, wherein: Also includes at least one switch state detection module; The first end of the switch state detection module is connected to the second end of the corresponding switch module, the second end of the switch state detection module is grounded, and the third end of the switch state detection module is connected to the control module, and the control module is used to determine the conduction state of the switch module according to the voltage output by the switch state detection module.

4. The temperature control circuit according to claim 3, characterized in that: The switch state detection module includes a first resistor and a second resistor; The first end of the first resistor serves as the first end of the switch state detection module, the second end of the first resistor is connected to the first end of the second resistor and serves as the third end of the switch state detection module, and the second end of the second resistor serves as the second end of the switch state detection module.

5. The temperature control circuit according to claim 1, wherein: The temperature acquisition module includes a thermistor, a third resistor and a fourth resistor; The first end of the thermistor is connected to the corresponding single unit and the first end of the third resistor, the second end of the thermistor is grounded, and the second end of the third resistor is connected to the input end of the control module; A first end of the fourth resistor is connected to a first end of the third resistor, and a second end of the fourth resistor is connected to a second voltage.

6. The temperature control circuit according to claim 5, characterized in that: The temperature acquisition module further includes a first capacitor and a second capacitor; The first end of the first capacitor is connected to the second end of the third resistor, the second end of the first capacitor is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the second end of the thermistor.

7. The temperature control circuit according to claim 1, characterized in that: It also includes a satellite service computer, which is in communication with the control module and is used to receive temperature information about each of the single machines fed back by the control module and issue control instructions to the control module.

8. The temperature control circuit according to claim 1, wherein: It also includes a power supply module, which is used to supply power to the control module and the switch module.

9. The temperature control circuit according to claim 1, wherein: The first set value is 15°C, and the second set value is 18°C.

10. A satellite platform, characterized in that: The temperature control circuit comprises the temperature control circuit according to any one of claims 1 to 9.

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