Forward high-temperature switching power supply

Abstract

The utility model discloses a forward high-temperature switching power supply, which comprises a master control circuit module, a feedback loop module, a transformer module and a rectifier filter module, the master control circuit module is respectively connected with the feedback loop module and the transformer module, the transformer module is connected with the rectifier filter module, and the rectifier filter module is connected with the feedback loop module. The main control circuit module collects a voltage signal of the transformer module, the feedback loop module transmits a feedback signal to the main control circuit module, and the main control circuit module receives the feedback signal transmitted by the feedback loop module; the main control circuit module controls the power supply to output stable voltage and current based on the voltage signal and the feedback signal.

Description

Technical Field

[0001] The utility model relates to the technical field of power supplies, in particular to a forward high-temperature switching power supply. Background Art

[0002] In recent years, the oil exploration industry has developed rapidly, and wells as deep as 10,000 meters have been achieved. Therefore, the demand for instruments and equipment that can work normally in harsh environments is also increasing. For example:

[0003] Downhole oil exploration instruments, downhole oil drilling instruments, etc., work in a high-temperature (10,000-meter oil well, the temperature has reached about 200℃) and high-pressure working environment underground, which is a big test for the power supply that provides power to the instruments and equipment, because the power supply itself also generates heat during work, so high temperature is a major obstacle to the normal operation of the power supply of downhole instruments. According to statistics, the reliability of electronic components decreases by 10% for every 2℃ increase in temperature, and the life of the components with a temperature rise of 50℃ is only 1 / 6 of that with a temperature rise of 25℃. Under this special demand, high-temperature resistant power supplies came into being.

[0004] The operating temperature of ordinary power supplies is between -5 and 55°C, the relative humidity is ≤90% (40±2°C), and the storage temperature is between -40 and 70°C. For high-temperature power supplies, the specific temperature values that the power supply can withstand are different in different application scenarios, and the various output efficiencies are also attenuated accordingly at different temperatures. The maximum operating temperatures of high-temperature power supplies currently used in the field of oil well logging are 120°C and 150°C, so the approximate operating temperature is between -55°C and 150°C. For low-power power supplies, the general operating frequency is between 100KHz and 500KHz. Because they have to work in a high-temperature environment, the degree of self-heating of the power supply components and the speed of heat dissipation are key.

[0005] With the increasing maturity of high-temperature power supply technology, many existing high-temperature power supply products can already meet the needs of the logging industry, but there are still some urgent problems to be solved in harsh environments such as high temperature and high pressure. Working under high temperature for a long time, various components are more likely to age. Compared with ordinary environments, it is more likely that the output voltage will be reduced or too high during use, the output current will be too large, and even the module will stop working, making it impossible to effectively guarantee the stable working time of the power supply. The higher the temperature, the greater the attenuation of the power output. At present, the limit temperature of most high-temperature power supplies is 150°C, and as the temperature increases, the rated power that the power supply can provide will be greatly attenuated. From the input and output of the power supply, the input current fluctuations and output voltage fluctuations and interference in a high-temperature environment will be much larger than at normal temperature, and it will be more difficult to eliminate. In a high-temperature environment, the conversion efficiency of the power supply will also be greatly attenuated, and the electromagnetic interference will be stronger than in an ordinary environment. Summary of the invention

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a forward high-temperature switching power supply, which realizes that the main control circuit module controls the stable output voltage and current of the power supply based on the voltage signal and the feedback signal.

[0007] In order to achieve the above invention purpose, the utility model adopts the following technical solutions:

[0008] A forward high-temperature switching power supply includes a main control circuit module, a feedback loop module, a transformer module and a rectifying and filtering module. The main control circuit module is respectively connected to the feedback loop module and the transformer module, the transformer module is connected to the rectifying and filtering module. The main control circuit module collects the voltage signal of the transformer module, the feedback loop module transmits the feedback signal to the main control circuit module, the main control circuit module receives the feedback signal transmitted by the feedback loop module, and the main control circuit module controls the stable output voltage and current of the power supply based on the voltage signal and the feedback signal.

[0009] Further, the main control circuit module includes a controller U1, a resistor R12, a resistor R13, a resistor R15, a resistor R16, a resistor R18, a resistor R20, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C44, a diode D6, a diode D9, and a silicon carbide MOS transistor Q1. The 1-pin end of the controller U1 is respectively connected to one end of the resistor R18 and the feedback loop module. The 2-pin end of the controller U1 is grounded. The 1-pin end of the controller U1 is respectively connected to one end of the resistor R6 and one end of the capacitor C40. The other end of the capacitor C40 is grounded. The other end of the resistor R16 is respectively connected to one end of the resistor R12, one end of the resistor R15 and the source end of the silicon carbide MOS transistor Q1. The other end of the resistor R15 is grounded. The other end of the resistor R12 is respectively connected to one end of the resistor R13, one end of the diode D6 and the gate end of the silicon carbide MOS transistor Q1. The drain end of the silicon carbide MOS transistor Q1 is connected to the transformer module. The 6-pin end of the controller U1 is respectively connected to the other end of the diode D6 and the other end of the resistor R13. The 4-pin end of the controller U1 is respectively connected to one end of the resistor R20 and one end of the capacitor C44. One end of the capacitor C44 and one end of the diode D6 are connected to the positive pole of the power supply. The other end of the capacitor C44, the other end of the diode D6 and the other end of the capacitor C44 are all grounded. The 8-pin end of the controller U1 is respectively connected to the other end of the resistor R20, one end of the capacitor C39 and the other end of the resistor R18. The other end of the capacitor C39 is grounded.

[0010] Further, the feedback loop module includes an optocoupler U3, a resistor R19, a resistor R22, a resistor R24, a resistor R25, a resistor R26, a capacitor C42, a capacitor C43, and a diode U2. The 4-pin terminal of the optocoupler U3 is connected to the main control circuit module, the 3-pin terminal of U3 is grounded, the 2-pin terminal of the optocoupler U3 is respectively connected to one end of the resistor R25, one end of the resistor R22, one end of the capacitor C42, and the 1-pin terminal of the diode U2. The other end of the resistor R22 is connected to one end of the capacitor C43. The other end of the capacitor C43 is respectively connected to the other end of the capacitor C42, the 2-pin terminal of the diode U2, one end of the resistor R19, and one end of the resistor R24. The 3-pin terminal of the diode U2 and the other end of the resistor R19 are grounded. The 1-pin terminal of the optocoupler U3 is respectively connected to the other end of the resistor R25 and one end of the resistor R26. The other end of the resistor R26 and the other end of the resistor R24 are connected to the positive pole of the power supply. The 3-pin terminal of the optocoupler U3 is grounded.

[0011] Further, the output voltage of the feedback loop module is divided by the resistors R19 and R24 and then enters the diode U2 for comparison with the reference voltage. The output of the 1-pin of the diode U2 and the optocoupler U3 convert the voltage signal into a current signal and apply it to the internal light-emitting diode of the optocoupler U3. The output end of the optocoupler U3 then restores the current signal to a voltage signal and sends it to the feedback terminal of the main control chip U1 to form a photoelectrically isolated closed-loop feedback.

[0012] Further, the transformer module includes a transformer T1, a diode D1, a diode D4, a diode D5, an inductor L1, and a resistor R11. The 1-pin terminal of the transformer T1 is connected to the positive pole of the power supply. The 1-pin terminal of the transformer T1 is connected to the main control circuit module. The 7-pin terminal of the transformer T1 is connected to one end of the diode D1. The other end of the diode D1 is grounded. The 10-pin terminal of the transformer T1 is connected to the rectification and filtering module. The 5-pin terminal of the transformer T1 is respectively connected to one end of the diode D4 and one end of the diode D5. One end of the inductor L1 is respectively connected to the other end of the diode D4 and the other end of the diode D5. The other end of the inductor L1 is connected to one end of the resistor R11. The other end of the resistor R11 is connected to the positive pole of the power supply.

[0013] Further, the rectification and filtering module includes an inductor L21, an inductor L22, a diode D2, a diode D3, a capacitor C3, a capacitor C7, a capacitor C12, a capacitor C21, a capacitor C22, and an inductor L11. One end of the diode D2 is connected to the transformer module. The other end of the diode D2, one end of the diode D3, one end of the capacitor C7, and one end of the inductor L11 are connected to the positive pole of the power supply. The other end of the inductor L11, one end of the capacitor C3, one end of the capacitor C21, and one end of the inductor L21 are connected to the positive pole of the power supply. The other end of the diode D3, the other end of the capacitor C7, the other end of the capacitor C3, and the other end of the capacitor C21 are all grounded. The positive pole of the power supply is respectively connected to the other end of the inductor L21, one end of the capacitor C12, and one end of the capacitor C22. One end of the inductor L22 is respectively connected to the other end of the capacitor C12 and the other end of the capacitor C22. The other end of the inductor L22 is grounded. The inductor L21 and the inductor L22 form a common-mode filter L2.

[0014] Preferably, as the switch in the rectification and filtering module is turned on and off, the current in the inductor fluctuates around the effective value of the output current. Therefore, a ripple with the same frequency as the switch will also appear at the output. It is related to the capacitance and ESR of the output capacitor. The silicon carbide MOSFET used in the present invention can effectively reduce the ripple. The operating frequency of the present invention reaches 300KHz, providing good filtering conditions. Without any filtering, the output voltage ripple is less than 80mV, and within the entire operating temperature range, the temperature stability of the frequency is ±8%.

[0015] Further, a forward high-temperature switching power supply is provided with a sealed metal potting housing, and the forward high-temperature switching power supply is installed in the sealed metal potting housing.

[0016] Further, a heat sink structure or / and a heat dissipation silicone layer are provided on the sealed metal potting housing, greatly improving the heat dissipation of the forward high-temperature switching power supply.

[0017] Further, a forward high-temperature switching power supply further includes a temperature acquisition module. The temperature acquisition module is connected to the main control circuit module. The temperature acquisition module acquires the temperature signal of the power supply housing and transmits it to the main control circuit module. The main control circuit module controls the working state of the power supply based on the temperature signal of the power supply housing.

[0018] The beneficial effects of the present utility model: The main control circuit module realizes the control of the power supply to output stable voltage and current based on the voltage signal and the feedback signal.

[0019] It realizes replacing the original ordinary MOS transistor with a silicon carbide MOS transistor. The silicon carbide material has a strong ability to conduct heat to the environment, resulting in a small temperature rise of the device, which can effectively reduce the temperature of the MOS transistor itself, thereby reducing the heat dissipation structure inside the power supply. In this way, at the same operating temperature, a smaller-sized power supply can be made. Exactly for this reason, there is room for improving the operating temperature of the power supply, and a heat sink for auxiliary heat dissipation can be installed in the power supply. Currently, the limit temperature test of the present invention in an incubator can achieve stable operation for 80 hours at 175°C.

[0020] It realizes setting a sealed metal potting housing for the forward high-temperature switching power supply. The forward high-temperature switching power supply is installed inside the sealed metal potting housing, ensuring the shock resistance, moisture resistance and maximum isolation of electromagnetic radiation of the power supply. A heat sink structure or / and a heat dissipation silica gel layer are provided on the sealed metal potting housing, greatly improving the heat dissipation of the forward high-temperature switching power supply. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is the circuit diagram of the main control circuit module of a forward high-temperature switching power supply of the present utility model;

[0023] Figure 2 It is the circuit diagram of the feedback loop module of a forward high-temperature switching power supply of the present utility model;

[0024] Figure 3 It is the circuit diagram of the transformer module of a forward high-temperature switching power supply of the present utility model;

[0025] Figure 4 It is the circuit diagram of the rectifier and filter module of a forward high-temperature switching power supply of the present utility model. Detailed Embodiments

[0026] The following will describe the embodiments of the present disclosure in detail with reference to the drawings.

[0027] The following describes the embodiments of the present disclosure through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0028] Embodiment 1:

[0029] A forward high-temperature switching power supply includes a main control circuit module, a feedback loop module, a transformer module, and a rectifier and filter module. The main control circuit module is respectively connected to the feedback loop module and the transformer module. The transformer module is connected to the rectifier and filter module. The main control circuit module collects the voltage signal of the transformer module. The feedback loop module transmits a feedback signal to the main control circuit module. The main control circuit module receives the feedback signal transmitted by the feedback loop module. The main control circuit module controls the power supply to output stable voltage and current based on the voltage signal and the feedback signal.

[0030] As shown in Fig. 1, the main control circuit module includes a controller U1, resistors R12, R13, R15, R16, R18, R20, capacitors C38, C39, C40, C44, diodes D6, D9, and a silicon carbide MOS transistor Q1. The 1-pin terminal of the controller U1 is respectively connected to one end of the resistor R18 and the feedback loop module. The 2-pin terminal of the controller U1 is grounded. The 1-pin terminal of the controller U1 is respectively connected to one end of the resistor R6 and one end of the capacitor C40. The other end of the capacitor C40 is grounded. The other end of the resistor R16 is respectively connected to one end of the resistor R12, one end of the resistor R15, and the source terminal of the silicon carbide MOS transistor Q1. The other end of the resistor R15 is grounded. The other end of the resistor R12 is respectively connected to one end of the resistor R13, one end of the diode D6, and the gate terminal of the silicon carbide MOS transistor Q1. The drain terminal of the silicon carbide MOS transistor Q1 is connected to the transformer module. The 6-pin terminal of the controller U1 is respectively connected to the other end of the diode D6 and the other end of the resistor R13. The 4-pin terminal of the controller U1 is respectively connected to one end of the resistor R20 and one end of the capacitor C44. One end of the capacitor C44 and one end of the diode D6 are connected to the positive pole of the power supply. The other end of the capacitor C44, the other end of the diode D6, and the other end of the capacitor C44 are all grounded. The 8-pin terminal of the controller U1 is respectively connected to the other end of the resistor R20, one end of the capacitor C39, and the other end of the resistor R18. The other end of the capacitor C39 is grounded.

[0031] It should be noted that the main control circuit module is responsible for providing the control of the current and voltage required by all components in the entire power supply. Currently, in high-temperature power supplies, ordinary MOS transistors are mostly used to cooperate with the controller to perform the switching function. The always-conducting MOS transistor is very easy to heat up. In fact, the long-term conduction and heating of the MOS transistor is an important reason for the power supply to heat up. In the present invention, the original ordinary MOS transistor is replaced with a silicon carbide MOS transistor. The silicon carbide material has a strong ability to conduct heat to the environment, and the temperature rise of the device is small, which can well reduce the temperature of the MOS transistor itself, thereby reducing the heat dissipation structure inside the power supply. In this way, at the same operating temperature, a smaller-sized power supply can be made. Exactly for this reason, there is room for improvement in the operating temperature of the power supply. A heat sink for auxiliary heat dissipation can be installed in the power supply. Currently, the limit temperature test of the present invention in an incubator can reach stable operation for 80 hours at 175 °C.

[0032] As Figure 2As shown in the figure, the feedback loop module includes an optocoupler U3, resistors R19, R22, R24, R25, R26, capacitors C42, C43, and a diode U2. The 4-pin terminal of the optocoupler U3 is connected to the main control circuit module, the 3-pin terminal of U3 is grounded, the 2-pin terminal of the optocoupler U3 is respectively connected to one end of the resistor R25, one end of the resistor R22, one end of the capacitor C42, and the 1-pin terminal of the diode U2. The other end of the resistor R22 is connected to one end of the capacitor C43. The other end of the capacitor C43 is respectively connected to the other end of the capacitor C42, the 2-pin terminal of the diode U2, one end of the resistor R19, and one end of the resistor R24. The 3-pin terminal of the diode U2 and the other end of the resistor R19 are grounded. The 1-pin terminal of the optocoupler U3 is respectively connected to the other end of the resistor R25 and one end of the resistor R26. The other end of the resistor R26 and the other end of the resistor R24 are connected to the positive pole of the power supply. The 3-pin terminal of the optocoupler U3 is grounded.

[0033] It should be noted that the output voltage of the feedback loop module is divided by the resistors R19 and R24 and enters the diode U2 for comparison with the reference voltage. The 1-pin output of the diode U2 and the optocoupler U3 convert the voltage signal into a current signal and apply it to the internal light-emitting diode of the optocoupler U3. The output terminal of the optocoupler U3 then restores the current signal to a voltage signal and sends it to the feedback terminal of the main control chip U1 to form an optoelectronic isolation closed-loop feedback. The feedback loop module is used to recover a part or all of the amplifier output signal (voltage or current) to the amplifier input terminal for comparison (addition or subtraction) with the input signal, and use the effective input signal obtained from the comparison to control the output, so that a stable output can be obtained even at high temperatures. Within the entire operating temperature range and under the conditions of full-load and no-load transformation, the output voltage fluctuation is within 0.2V, and the voltage output accuracy of 3.3V reaches within 0.1V.

[0034] The Figure 3 As shown in the figure, the transformer module includes a transformer T1, diodes D1, D4, D5, an inductor L1, and a resistor R11. The 1-pin terminal of the transformer T1 is connected to the positive pole of the power supply. The 1-pin terminal of the transformer T1 is connected to the main control circuit module. The 7-pin terminal of the transformer T1 is connected to one end of the diode D1. The other end of the diode D1 is grounded. The 10-pin terminal of the transformer T1 is connected to the rectifier filter module. The 5-pin terminal of the transformer T1 is respectively connected to one end of the diode D4 and one end of the diode D5. One end of the inductor L1 is respectively connected to the other end of the diode D4 and the other end of the diode D5. The other end of the inductor L1 is connected to one end of the resistor R11. The other end of the resistor R11 is connected to the positive pole of the power supply.

[0035] It should be noted that for the transformation of the isolation voltage of the power input, according to the special high-temperature environment in which the transformer of the present invention is used, the transformer module improves the conversion efficiency by using a core made of special materials and a special coil winding process, combined with the application of silicon carbide MOS transistors. Compared with ordinary high-temperature power supplies, the power loss of the output is reduced. This special process also reduces iron loss and copper loss, greatly reducing the heat generated by them, and thus reducing the temperature rise of the transformer.

[0036] As Figure 4 shown, the rectifier and filter module includes inductor L21, inductor L22, diode D2, diode D3, capacitor C3, capacitor C7, capacitor C12, capacitor C21, capacitor C22, inductor L11. One end of diode D2 is connected to the transformer module, and the other end of diode D2, one end of diode D3, one end of capacitor C7 and one end of inductor L11 are connected to the positive pole of the power supply. The other end of inductor L11, one end of capacitor C3, one end of capacitor C21 and one end of inductor L21 are connected to the positive pole of the power supply. The other end of diode D3, the other end of capacitor C7, the other end of capacitor C3 and the other end of capacitor C21 are all grounded. The positive pole of the power supply is respectively connected to the other end of inductor L21, one end of capacitor C12 and one end of capacitor C22. One end of inductor L22 is respectively connected to the other end of capacitor C12 and the other end of capacitor C22. The other end of inductor L22 is grounded. Inductors L21 and L22 form a common-mode filter L2.

[0037] It should be noted that as the switch in the rectifier and filter module is turned on and off, the current in the inductor also fluctuates around the effective value of the output current. Therefore, a ripple with the same frequency as the switch will also appear at the output. It is related to the capacitance and ESR of the output capacitor. The silicon carbide MOS transistors used in the present invention can effectively reduce the ripple. The operating frequency of the present invention reaches 300 KHz, providing good filtering conditions. Without any filtering, the voltage ripple of its output is less than 80 mV, and within the entire operating temperature range, the temperature stability of the frequency is ±8%.

[0038] In order to ensure the shock resistance, moisture resistance and maximum isolation of electromagnetic radiation of the power supply, a sealed metal potting housing is provided for the forward high-temperature switch power supply, and the forward high-temperature switch power supply is installed in the sealed metal potting housing. Further, a heat sink structure or / and a heat dissipation silicone layer is provided on the sealed metal potting housing, greatly improving the heat dissipation of the forward high-temperature switch power supply. The forward high-temperature switch power supply adopts the process of sealed metal potting and a unique heat dissipation technology (heat sink and self-adjusting proportion heat dissipation silicone), ensuring the shock resistance and moisture resistance of the power supply and maximizing the isolation of electromagnetic radiation.

[0039] Further, in order to protect the safe use of the power supply, a forward high-temperature switching power supply further includes a temperature acquisition module. The temperature acquisition module is connected to the main control circuit module. The temperature acquisition module acquires the temperature signal of the power supply housing and transmits it to the main control circuit module. The main control circuit module controls the working state of the power supply based on the temperature signal of the power supply housing.

[0040] For example, the temperature acquisition module acquires the temperature signal of the power supply housing and transmits it to the main control circuit module. The main control circuit module controls the working state of the power supply based on the temperature signal of the power supply housing. The power supply can operate stably and continuously for 300 hours at a housing temperature of 150°C, 80 hours at a housing temperature of 175°C, and 40 hours at a housing temperature of 185°C.

[0041] During use, after the power supply is powered on, it will automatically determine whether there is under-voltage or over-voltage. In either of these two cases, the power supply will automatically turn off the output. If the voltage is normal, the power supply will automatically turn on the output, and then determine whether there is over-current. If there is over-current, the output will also be automatically turned off. Otherwise, a stable voltage and current will be output to provide a stable voltage and current output for the device. During the working process, the temperature of the power supply itself will continuously rise. If the working environment of the power supply is maintained above the designed working temperature of the power supply, and if the power supply shows overheating, the power supply will also automatically turn off.

[0042] The terms "first", "second", "third", etc. in the specification of this application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order different from those illustrated or described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0043] As described above, the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments or equivalently replace some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A forward high-temperature switching power supply, characterized in that, It includes a main control circuit module, a feedback loop module, a transformer module, and a rectifier and filter module. The main control circuit module is respectively connected to the feedback loop module and the transformer module. The transformer module is connected to the rectifier and filter module. The main control circuit module collects the voltage signal of the transformer module. The feedback loop module transmits a feedback signal to the main control circuit module. The main control circuit module receives the feedback signal transmitted by the feedback loop module. The main control circuit module controls the power supply to output stable voltage and current based on the voltage signal and the feedback signal.

2. The forward high-temperature switching power supply according to claim 1, wherein, The main control circuit module includes a controller U1, a resistor R12, a resistor R13, a resistor R15, a resistor R16, a resistor R18, a resistor R20, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C44, a diode D6, a diode D9, and a silicon carbide MOS transistor Q1. The 1-pin end of the controller U1 is respectively connected to one end of the resistor R18 and the feedback loop module. The 2-pin end of the controller U1 is grounded. The 1-pin end of the controller U1 is respectively connected to one end of the resistor R6 and one end of the capacitor C40. The other end of the capacitor C40 is grounded. The other end of the resistor R16 is respectively connected to one end of the resistor R12, one end of the resistor R15, and the source electrode end of the silicon carbide MOS transistor Q1. The other end of the resistor R15 is grounded. The other end of the resistor R12 is respectively connected to one end of the resistor R13, one end of the diode D6, and the gate electrode end of the silicon carbide MOS transistor Q1. The drain electrode end of the silicon carbide MOS transistor Q1 is connected to the transformer module. The 6-pin end of the controller U1 is respectively connected to the other end of the diode D6 and the other end of the resistor R13. The 4-pin end of the controller U1 is respectively connected to one end of the resistor R20 and one end of the capacitor C44. One end of the capacitor C44 and one end of the diode D6 are connected to the positive pole of the power supply. The other end of the capacitor C44, the other end of the diode D6, and the other end of the capacitor C44 are all grounded. The 8-pin end of the controller U1 is respectively connected to the other end of the resistor R20, one end of the capacitor C39, and the other end of the resistor R18. The other end of the capacitor C39 is grounded.

3. The forward high-temperature switching power supply according to claim 1, wherein The feedback loop module includes an optocoupler U3, resistors R19, R22, R24, R25, R26, capacitors C42, C43, and a diode U2. The 4-pin end of the optocoupler U3 is connected to the main control circuit module, and the 3-pin end of U3 is grounded. The 2-pin end of the optocoupler U3 is connected to one end of the resistor R25, one end of the resistor R22, one end of the capacitor C42, and the 1-pin end of the diode U2. The other end of the resistor R22 is connected to one end of the capacitor C43. The other end of the capacitor C43 is connected to the other end of the capacitor C42, the 2-pin end of the diode U2, one end of the resistor R19, and one end of the resistor R24. The 3-pin end of the diode U2 and the other end of the resistor R19 are grounded. The 1-pin end of the optocoupler U3 is connected to the other end of the resistor R25 and one end of the resistor R26. The other end of the resistor R26 and the other end of the resistor R24 are connected to the positive pole of the power supply. The 3-pin end of the optocoupler U3 is grounded.

4. The forward high-temperature switching power supply according to claim 3, characterized in that, The output voltage of the feedback loop module is divided by the resistors R19 and R24 and then enters the diode U2 for comparison with the reference voltage. The 1-pin output of the diode U2 and the optocoupler U3 convert the voltage signal into a current signal and apply it to the internal light-emitting diode of the optocoupler U3. The output end of the optocoupler U3 then restores the current signal to a voltage signal and sends it to the feedback end of the main control chip U1, forming an opto-electrical isolated closed-loop feedback.

5. The forward high-temperature switching power supply according to claim 1, wherein, The transformer module includes a transformer T1, diodes D1, D4, D5, an inductor L1, and a resistor R11. The 1-pin end of the transformer T1 is connected to the positive pole of the power supply. The 1-pin end of the transformer T1 is connected to the main control circuit module. The 7-pin end of the transformer T1 is connected to one end of the diode D1. The other end of the diode D1 is grounded. The 10-pin end of the transformer T1 is connected to the rectification and filtering module. The 5-pin end of the transformer T1 is connected to one end of the diode D4 and one end of the diode D5. One end of the inductor L1 is connected to the other end of the diode D4 and the other end of the diode D5. The other end of the inductor L1 is connected to one end of the resistor R11. The other end of the resistor R11 is connected to the positive pole of the power supply.

6. The forward high-temperature switching power supply according to claim 1, wherein, The rectifying and filtering module includes an inductor L21, an inductor L22, a diode D2, a diode D3, a capacitor C3, a capacitor C7, a capacitor C12, a capacitor C21, a capacitor C22, and an inductor L11. One end of the diode D2 is connected to the transformer module, and the other end of the diode D2, one end of the diode D3, one end of the capacitor C7, and one end of the inductor L11 are connected to the positive pole of the power supply. The other end of the inductor L11, one end of the capacitor C3, one end of the capacitor C21, and one end of the inductor L21 are connected to the positive pole of the power supply. The other end of the diode D3, the other end of the capacitor C7, the other end of the capacitor C3, and the other end of the capacitor C21 are all grounded. The positive pole of the power supply is respectively connected to the other end of the inductor L21, one end of the capacitor C12, and one end of the capacitor C22. One end of the inductor L22 is respectively connected to the other end of the capacitor C12 and the other end of the capacitor C22. The other end of the inductor L22 is grounded, and the inductor L21 and the inductor L22 form a common-mode filter L2.

7. The forward high-temperature switching power supply according to claim 6, characterized in that, The operating frequency in the rectifying and filtering module is 300 KHz.

8. The forward high-temperature switching power supply according to any one of claims 1-7, characterized in that, The forward high-temperature switching power supply is provided with a sealed metal potting housing, and the forward high-temperature switching power supply is installed in the sealed metal potting housing.

9. The forward high-temperature switching power supply according to claim 8, wherein, It also includes a heat sink structure or / and a heat dissipation silicone layer provided on the sealed metal potting housing.

10. The forward high-temperature switching power supply according to claim 8, wherein It also includes a temperature acquisition module. The temperature acquisition module is connected to the main control circuit module. The temperature acquisition module acquires the temperature signal of the power supply housing and transmits it to the main control circuit module. The main control circuit module controls the working state of the power supply based on the temperature signal of the power supply housing.

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