High-temperature-resistant AC-DC power supply module

Abstract

The invention discloses a high-temperature-resistant AC-DC power module. The high-temperature-resistant AC-DC power module is characterized in that an EMI circuit is externally connected with 220V alternating current; the EMI circuit is connected with the input rectification circuit. The input rectifying circuit is connected with the power starting circuit; the power starting circuit is connected with the control circuit and the control driving circuit; the control circuit is connected with the control drive circuit; the control drive circuit is connected with the transformer Q4; the transformer Q4 is respectively connected with the power supply starting circuit, the input rectifying circuit, the peak absorption circuit and the output rectifying and filtering circuit; the output rectification filter circuit is connected with the feedback voltage stabilizing circuit. The feedback voltage stabilizing circuit is connected with the control circuit; the input rectifying circuit is connected with the control circuit; the peak absorption circuit is connected with the input rectification circuit. And the output rectification filter circuit outputs 36V direct current. According to the invention, the input dynamic range is 180VAC to 260VAC, and the output 36V / 1.5 A voltage regulation is realized; through a heat dissipation and heat conduction process of the power supply module, stable work in an extremely high-temperature environment of 175 DEG C is realized; the functions of insulation, shock resistance, heat dissipation and heat conduction of the power module are ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supplies, and relates to a high-temperature AC-DC power supply module. Background Art

[0002] Switching power supplies are widely used in electronic instruments and equipment because of their advantages over linear power supplies, such as small size, high efficiency, low heat generation, and good stability. Currently, switching power supplies are widely used in various logging industry instruments due to their characteristics of small size, light weight, and high conversion efficiency. Switching power supplies are often vulnerable to functional and environmental stresses, which may lead to failures. In the complex and harsh downhole environment, temperature, pressure, vibration, corrosion, etc. will pose higher requirements on downhole instruments. Among them, for every 100 m of depth increase, the downhole pressure increases by more than 1 Mpa, and the bottom hole temperature increases by 15 - 30 °C / km with the increase of well depth. Generally, the deepest drilling depth can reach about 7000 m. Therefore, the downhole environmental pressure can be as high as more than 70 Mpa, and the temperature can exceed 140 °C. During the drilling process, the downhole drill bit is in a complex vibration state, and the vibration intensity of the entire drill collar can be as high as 5g (g is the acceleration of gravity). The downhole formation components are complex. In addition to various rocks and groundwater, there are also many corrosive liquids and gases. The above environmental factors will all affect the instruments. Among them, the temperature has an impact on downhole instruments as high as 55%.

[0003] The continuous working time downhole often reaches more than ten hours or even several days. Under the long-term high-temperature and high-pressure conditions downhole, the performance of internal chips and electronic components of the instrument will be greatly affected. Compared with other power supplies, the power supply of drilling instruments needs to maintain a normal working state under extreme conditions. Therefore, the power supply of drilling instruments faces more severe challenges to avoid major losses caused by instrument failure due to high temperature, high vibration, etc. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the prior art that conventional power supply modules cannot supply power to downhole instruments normally due to being restricted by extreme complex environments such as high temperature and high pressure downhole, and to provide a high-temperature resistant AC-DC power supply module.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-temperature resistant AC-DC power supply module includes: a power start circuit, an EMI circuit, an input rectification circuit, a spike absorption circuit, a transformer Q4, an output rectification and filtering circuit, a control and drive circuit, a control circuit, and a feedback voltage stabilization circuit;

[0007] The EMI circuit is externally connected to 220V AC power; the EMI circuit is connected to the input rectifier circuit; the input rectifier circuit is connected to the power startup circuit; the power startup circuit is connected to the control circuit and the control drive circuit; the control circuit is connected to the control drive circuit; the control drive circuit is connected to the transformer Q4; the transformer Q4 is respectively connected to the power startup circuit, the input rectifier circuit, the spike absorption circuit and the output rectifier and filter circuit; the output rectifier and filter circuit is connected to the feedback voltage regulation circuit; the feedback voltage regulation circuit is connected to the control circuit; the input rectifier circuit is connected to the control circuit; the spike absorption circuit is connected to the input rectifier circuit; the output rectifier and filter circuit outputs 36V DC power.

[0008] A further improvement of the present invention lies in:

[0009] Furthermore, the EMI circuit includes: inductor L1, inductor L2, capacitor C5, capacitor C6, capacitor C7, common mode transformer GM1 and common mode transformer GM2;

[0010] One end of the primary coil of the common mode transformer GM1 is connected to the 220V input voltage; the other end of the primary coil of the common mode transformer GM1 is connected to one end of the inductor L1 and one end of the capacitor C5; the other end of the inductor L1 is connected to one end of the capacitor C6 and one end of the primary coil of the common mode transformer GM2; one end of the secondary coil of the common mode transformer GM1 is connected to the 220V output voltage; the other end of the secondary coil of the common mode transformer GM1 is connected to one end of the inductor L2 and the other end of the capacitor C5; the other end of the inductor L2 is connected to the other end of the capacitor C6 and one end of the secondary coil of the common mode transformer GM2; the other end of the secondary coil of the common mode transformer GM2 is connected to the other end of the capacitor C7 and the input rectifier circuit; the other end of the primary coil of the common mode transformer GM2 is connected to one end of the capacitor C7 and the input rectifier circuit.

[0011] Furthermore, the input rectifier circuit includes diodes D4, D5, D6, D7, capacitors C8, C9, C10, C11 and C12;

[0012] The positive electrode of diode D4 is connected to the negative electrode of diode D6; the positive electrode of diode D5 is connected to the negative electrode of diode D7; the negative electrodes of diode D4, diode D5, and one end of capacitor C8 are connected to the power supply startup circuit and the control circuit; the negative electrodes of diode D4, diode D5, and one end of capacitor C8 are simultaneously connected to the spike absorption circuit; the other end of capacitor C8 is connected to one end of capacitor C9; the other end of capacitor C9 is connected to one end of capacitor C10, the other end of capacitor C10 is connected to one end of capacitor C11, the other end of capacitor C11 is connected to one end of capacitor C12, and the other end of capacitor C12, the positive electrodes of diode D6, and the positive electrode of diode D7 are commonly grounded; the positive electrode of diode D4 and the negative electrode of diode D6 are commonly connected to one end of capacitor C7; the positive electrode of diode D5 and the negative electrode of diode D7 are commonly connected to the other end of capacitor C7.

[0013] Further, the spike absorption circuit includes resistor R10, resistor R11, resistor R12, resistor R13, resistor R14, capacitor C13, and diode D8;

[0014] One end of resistor R10 is connected to the other end of resistor R11; one end of resistor R13 is connected to the other end of resistor R14; the other end of resistor R12 is connected to one end of capacitor C13; the other end of capacitor C13, the other end of resistor R13, and the other end of resistor R10 are commonly connected to one end of capacitor C8; one end of resistor R11, one end of resistor R12, and one end of resistor R14 are commonly connected to the negative electrode of diode D8; the positive electrode of diode D8 is connected to one end of the main winding of transformer Q4; one end of capacitor C8 is connected to the other end of the main winding of transformer Q4; one end of the auxiliary winding of transformer Q4 is grounded; the other end of the auxiliary winding of transformer Q4 is connected to the power supply startup circuit; the positive electrode of diode D8 is connected to the control drive circuit; both ends of the secondary winding of transformer Q4 are connected to the output rectification and filtering circuit; one end of the secondary winding of transformer Q4 is grounded.

[0015] Further, the output rectification and filtering circuit includes resistor R39, resistor R40, capacitor C24, capacitor C25, capacitor C26, capacitor C27, capacitor C28, inductor L3, transformer GM3, resistor R15, diode D9, diode D10, diode D11, diode D12, and capacitor C14;

[0016] The other ends of the secondary windings of transformer Q4 are respectively connected to the anodes of diodes D9, D10, D11 and D12; the cathodes of diodes D9, D10, D11 and D12 are simultaneously connected to one end of resistor R15; the other end of resistor R15 is connected to one end of capacitor C14; the other end of capacitor C14 is simultaneously connected to one end of the secondary winding of transformer Q4 and to LGND; the cathodes of diodes D9, D10, D11 and D12 are simultaneously connected to one end of capacitor C24; at the same time, one end of capacitor C24 is connected to the feedback voltage stabilizing circuit, one end of resistor R39 and one end of inductor L3; the other end of capacitor C24 is connected to the other end of resistor R39, the other end of capacitor C25, the other end of capacitor C26 and one end of the secondary coil of transformer GM3; the other end of inductor L3 is connected to one end of capacitor C25, one end of capacitor C26 and one end of the primary coil of transformer GM3; the other end of the primary coil of transformer GM3 is connected to one end of capacitor C27 and one end of resistor R40; the other end of the secondary coil of transformer GM3 is connected to the other end of capacitor C27 and the other end of resistor R40; one end of capacitor C27 is externally connected to the positive pole of VI; the other end of capacitor C27 is externally connected to the negative pole of VI; the other end of capacitor C25 is connected to LGND; both ends of capacitor C28 are grounded; capacitor C28 absorbs static electricity; it is a small-capacity high-voltage capacitor.

[0017] Further, the power supply startup circuit includes resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, diodes D1, D2, D3, capacitors C1, C2, C3, C4, MOS transistors Q1 and Q2;

[0018] One end of the resistor R1 is connected to the other end of the auxiliary winding of the transformer Q4; the other end of the resistor R1 is connected to the positive electrode of the diode D1; the negative electrode of the diode D1 is respectively connected to one end of the capacitor C1, one end of the resistor R2 and one end of the resistor R3; the other end of the capacitor C1 is grounded; the other ends of the resistor R2 and the resistor R3 are simultaneously connected to the negative electrode of the diode D3 and one end of the capacitor C4, and one end of the capacitor C4 is externally connected to VCC; the other end of the capacitor C4 is respectively connected to the positive electrode of the diode D3 and the source electrode of the MOS transistor Q2; the drain electrode of the MOS transistor Q2 is connected to the gate electrode of the MOS transistor Q1 and the other end of the resistor R7; the negative electrode of the diode D3 is connected to the source electrode of the MOS transistor Q1; the drain electrode of the MOS transistor Q1 is connected to one end of the resistor R4; one end of the resistor R4 is connected to the negative electrode of the diode D4, the negative electrode of the diode D5 and one end of the capacitor C8; the other end of the resistor R4 is connected to one end of the resistor R5; the other end of the resistor R5 is connected to one end of the resistor R6; the other end of the resistor R6 is connected to one end of the resistor R7; one end of the resistor R7 is connected to the negative electrode of the diode D2, one end of the resistor R8 and one end of the capacitor C2; the positive electrode of the diode D2, the other end of the resistor R8 and the other end of the capacitor C2 are simultaneously connected to the other end of the capacitor C3; one end of the capacitor C3 is connected to the gate electrode of the MOS transistor Q2 and one end of the resistor R9; the other end of the resistor R9 is externally connected to a 5V voltage; the other end of the capacitor C3 is grounded; the source electrode of the MOS transistor Q2 is grounded.

[0019] Further, the control drive circuit includes a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a diode D14, a diode D15, a diode D16, a capacitor C22, a capacitor C23, an integrated chip U1, a MOS transistor Q3 and a resistor R16;

[0020] The positive electrode of the diode D8 is connected to the drain of the MOS transistor Q3; the source of the MOS transistor Q3 is connected to one end of the resistor R16; the gate of the MOS transistor Q3 is connected to the other end of the resistor R28; the other end of the resistor R16 is grounded; the positive electrode of the diode D15 is connected to the positive electrode of the diode D16; the negative electrode of the diode D16 is grounded; the negative electrode of the diode D15 is connected to the other end of the resistor R26 and one end of the capacitor C23; one end of the resistor R26 is connected to one end of the resistor R27, one end of the resistor R28, and the other end of the resistor R25; one end of the resistor R25 is grounded; the other end of the resistor R27 is connected to the other end of the capacitor C23 and the VEE port of the integrated chip U1; the SINK port and the Source port of the integrated chip U1 are connected to the negative electrode of the diode D14 and one end of the resistor R29; the positive electrode of the diode D14 and the other end of the resistor R29 are simultaneously connected to the other end of the resistor R28; the other end of the resistor R28 is connected to the gate of the MOS transistor Q3; the IN port of the integrated chip U1 is connected to one end of the resistor R30; the VCC port of the integrated chip U1 is connected to one end of the resistor R31; the VCC port of the integrated chip U1 is externally connected to the VCC power supply and one end of the capacitor C22; the other end of the capacitor C22 is grounded; the other ends of the resistor R30 and the resistor R31 are simultaneously connected to the control circuit.

[0021] Further, the control circuit includes a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37, a resistor R38, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, and an integrated chip U2;

[0022] Resistors R35, R36, R37, and R38 are connected in series in sequence; resistor R35 is connected to one end of resistor R4, the negative electrode of diode D4, the negative electrode of diode D5, and one end of capacitor C8; resistor R38 is connected to one end of resistor R34; the other end of resistor R34 is externally connected to a 5V voltage and one end of resistor R33; the other end of resistor R33 is connected to one end of capacitor C19, one end of capacitor C20, and the Rt / Ct port of integrated chip U2; the other end of capacitor C19 is grounded; the other end of capacitor C20 is connected to one end of resistor R34, one end of capacitor C21, and the Isense port of integrated chip U2; the other end of capacitor C21 is grounded; the Vfb port of integrated chip U2 is grounded; the COMP port of integrated chip U2 is connected to a feedback voltage stabilizing circuit; the GND port of integrated chip U2 is grounded; the OUTPUT port of integrated chip U2 is connected to the other end of resistor R30; the VCC port of integrated chip U2 is connected to the other end of resistor R31; the Vref port of integrated chip U2 is connected to one end of resistor R32, one end of capacitor C18, and a 5V voltage; the other ends of capacitor C18 and capacitor C17 are grounded simultaneously; one end of capacitor C17 is connected to the other end of resistor R31; the other end of resistor R32 is connected to the feedback voltage stabilizing circuit.

[0023] Further, the feedback voltage stabilizing circuit includes resistors R17, R18, R19, R20, R21, R22, R23, capacitors C15, C18, C16, diodes D13, D17, and optocoupler D18;

[0024] One end of resistor R17 is connected to one end of resistor R18, one end of resistor R22, and optocoupler D18; optocoupler D18 is simultaneously connected to the other end of resistor R22 and the positive electrode of diode D13; the negative electrode of diode D13 is connected to one end of resistor R20 and one end of capacitor C24; the other end of resistor R20 is connected to one end of resistor R21, the other end of capacitor C15, and the negative electrode of diode D17; the other end of resistor R21 is connected to the positive electrode of diode D17 and is connected to LGND; the negative electrode of diode D17 is connected to the other end of resistor R17, the other end of resistor R18, and one end of resistor R19; the other end of resistor R19 is connected to one end of capacitor C15; the other end of capacitor C16 is connected to one end of resistor R23; the other end of resistor R23 is grounded; one end of capacitor C16 is connected to the other end of resistor R32 and the COMP port of integrated chip U2; at the same time, one end of capacitor C16 is connected to optocoupler D18, and one end of optocoupler D18 is grounded.

[0025] Further, the power-on circuit, EMI circuit, transformer Q4, input rectifier circuit, spike absorption circuit, output rectifier and filter circuit, control and drive circuit, control circuit, and feedback voltage regulation circuit are all arranged in the "double-layer board" three-dimensional structure composed of a polyimide circuit board and an ALN ceramic circuit board;

[0026] Artificial synthetic graphite and thermal conductive silicone grease are pasted in the power-on circuit, EMI circuit, input rectifier circuit, spike absorption circuit, output rectifier and filter circuit, control and drive circuit, control circuit, and feedback voltage regulation circuit; High-temperature insulating and thermally conductive potting glue is used to fill the gaps between each circuit and the circuit board.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention externally connects 220V alternating current through the EMI circuit; the EMI circuit is connected to the input rectifier circuit; the input rectifier circuit is connected to the power-on circuit; the power-on circuit is connected to the control circuit and the control and drive circuit; the control circuit is connected to the control and drive circuit; the control and drive circuit is connected to transformer Q4; transformer Q4 is respectively connected to the power-on circuit, input rectifier circuit, spike absorption circuit, and output rectifier and filter circuit; the output rectifier and filter circuit is connected to the feedback voltage regulation circuit; the feedback voltage regulation circuit is connected to the control circuit; the input rectifier circuit is connected to the control circuit; the spike absorption circuit is connected to the input rectifier circuit; the output rectifier and filter circuit outputs 36V direct current. The present invention realizes an input dynamic range of 180VAC - 260VAC and a power supply voltage of 36V / 1.5A at the output. Through the heat dissipation and heat conduction process of the power supply module, the functions of insulation, earthquake resistance, heat dissipation, and heat conduction of the power supply module are ensured, meeting the requirements of long-term stable operation of the instrument in the complex and extreme downhole environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a circuit connection schematic diagram of the AC-DC power supply module;

[0031] Figure 2 It is a connection schematic diagram of the EMI circuit, input rectifier circuit, and spike absorption circuit;

[0032] Figure 3 It is a circuit diagram of the power-on circuit;

[0033] Figure 4Schematic diagram of the connection of the drive circuit, control circuit and feedback voltage stabilization circuit;

[0034] Figure 5 Structural diagram of the integrated chip U1;

[0035] Figure 6 Structural diagram of the integrated chip U2;

[0036] Figure 7 Circuit diagram of the output rectifier and filter circuit;

[0037] Figure 8 Installation schematic diagram of the polyimide circuit board and the ALN ceramic circuit board; where 1 is the polyimide circuit board; 2 is the ALN ceramic circuit board;

[0038] Figure 9 (a) Schematic diagram of the heat generation of the power device without adding artificial synthetic graphite;

[0039] Figure 9 (b) Schematic diagram of the heat generation of the power device with added artificial synthetic graphite;

[0040] Figure 10 Circuit simulation effect display diagram of the power supply module;

[0041] Figure 11 Heat dissipation structure block diagram; where 3 is thermal grease; 4 is artificial synthetic graphite sheet; 5 is the encapsulated power device. Detailed implementation manners

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0044] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0045] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0046] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0047] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] The following further describes the present invention in detail with reference to the drawings:

[0049] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , the present invention discloses a high-temperature-resistant AC-DC power module, including: a power startup circuit, an EMI circuit, an input rectification circuit, a spike absorption circuit, a transformer Q4, an output rectification and filtering circuit, a control and drive circuit, a control circuit, and a feedback voltage stabilization circuit;

[0050] The EMI circuit is externally connected to 220V AC power; the EMI circuit is connected to the input rectifier circuit; the input rectifier circuit is connected to the power supply startup circuit; the power supply startup circuit is connected to the control circuit and the control drive circuit; the control circuit is connected to the control drive circuit; the control drive circuit is connected to transformer Q4; transformer Q4 is respectively connected to the power supply startup circuit, the input rectifier circuit, the spike absorption circuit and the output rectifier and filter circuit; the output rectifier and filter circuit is connected to the feedback voltage stabilization circuit; the feedback voltage stabilization circuit is connected to the control circuit; the input rectifier circuit is connected to the control circuit; the spike absorption circuit is connected to the input rectifier circuit; the output rectifier and filter circuit outputs 36V DC power.

[0051] The 220V AC power passes through the EMI circuit to filter out common-mode and differential-mode interference, and the 220V AC power is full-wave rectified into 310V DC power by the input rectifier circuit. The 310V DC power supplies power to the control circuit through the power supply startup circuit to complete the startup of integrated circuit U2, that is, the control drive circuit starts to work. After the control circuit starts to work, the control drive circuit generates a PWM control signal to chop the 310V DC power after input rectification, and transformer Q4 starts to work. The secondary winding of the transformer generates an output voltage, and the output voltage becomes 36V DC power after passing through the output rectifier and filter circuit. While 36V is used as the output of the overall power supply module, it will also be monitored by the feedback voltage stabilization circuit at the same time. When the load changes, the feedback voltage stabilization circuit will quickly feedback the change of the output voltage to the control circuit, and the control circuit will respond by adjusting the PWM control signal, so that the output is stabilized at 36V. At the same time, the voltage generated by the power supply winding of transformer Q4 will enter the power supply startup circuit for rectification and filtering to continuously and stably supply power to integrated circuit U2 of the control circuit and integrated circuit U1 of the control drive circuit. The spike absorption circuit is an auxiliary circuit for the main winding of transformer Q4 and is used to suppress switching surges.

[0052] The EMI circuit includes: inductor L1, inductor L2, capacitor C5, capacitor C6, capacitor C7, common-mode transformer GM1 and common-mode transformer GM2;

[0053] One end of the primary coil of the common-mode transformer GM1 is connected to the 220V input voltage; the other end of the primary coil of the common-mode transformer GM1 is connected to one end of the inductor L1 and one end of the capacitor C5; the other end of the inductor L1 is connected to one end of the capacitor C6 and one end of the primary coil of the common-mode transformer GM2; one end of the secondary coil of the common-mode transformer GM1 is connected to the 220V output voltage; the other end of the secondary coil of the common-mode transformer GM1 is connected to one end of the inductor L2 and the other end of the capacitor C5; the other end of the inductor L2 is connected to the other end of the capacitor C6 and one end of the secondary coil of the common-mode transformer GM2; the other end of the secondary coil of the common-mode transformer GM2 is connected to the other end of the capacitor C7 and the input rectifier circuit; the other end of the primary coil of the common-mode transformer GM2 is connected to one end of the capacitor C7 and the input rectifier circuit.

[0054] The input rectifier circuit includes diodes D4, D5, D6, D7, capacitors C8, C9, C10, C11, and C12;

[0055] The positive electrode of the diode D4 is connected to the negative electrode of the diode D6; the positive electrode of the diode D5 is connected to the negative electrode of the diode D7; the negative electrodes of the diodes D4 and D5 and one end of the capacitor C8 are connected to the power supply startup circuit and the control circuit; the negative electrodes of the diodes D4 and D5 and one end of the capacitor C8 are simultaneously connected to the spike absorption circuit; the other end of the capacitor C8 is connected to one end of the capacitor C9; the other end of the capacitor C9 is connected to one end of the capacitor C10, the other end of the capacitor C10 is connected to one end of the capacitor C11, the other end of the capacitor C11 is connected to one end of the capacitor C12, the other end of the capacitor C12, the positive electrodes of the diodes D6 and D7 are grounded together; the positive electrode of the diode D4 and the negative electrode of the diode D6 are commonly connected to one end of the capacitor C7; the positive electrode of the diode D5 and the negative electrode of the diode D7 are commonly connected to the other end of the capacitor C7.

[0056] The spike absorption circuit includes resistors R10, R11, R12, R13, R14, capacitor C13, and diode D8;

[0057] One end of the resistor R10 is connected to the other end of the resistor R11; one end of the resistor R13 is connected to the other end of the resistor R14; the other end of the resistor R12 is connected to one end of the capacitor C13; the other end of the capacitor C13, the other end of the resistor R13 and the other end of the resistor R10 are commonly connected to one end of the capacitor C8; one end of the resistor R11, one end of the resistor R12 and one end of the resistor R14 are commonly connected to the negative electrode of the diode D8; the positive electrode of the diode D8 is connected to one end of the main winding of the transformer Q4; one end of the capacitor C8 is connected to the other end of the main winding of the transformer Q4; one end of the auxiliary winding of the transformer Q4 is grounded; the other end of the auxiliary winding of the transformer Q4 is connected to the power supply startup circuit; the positive electrode of the diode D8 is connected to the control drive circuit; both ends of the secondary winding of the transformer Q4 are connected to the output rectification and filtering circuit; one end of the secondary winding of the transformer Q4 is grounded.

[0058] The output rectification and filtering circuit includes a resistor R39, a resistor R40, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, an inductor L3, a transformer GM3, a resistor R15, diodes D9, D10, D11, D12 and a capacitor C14;

[0059] The other end of the secondary winding of the transformer Q4 is respectively connected to the positive electrodes of the diodes D9, D10, D11 and D12; the negative electrodes of the diodes D9, D10, D11 and D12 are simultaneously connected to one end of the resistor R15; the other end of the resistor R15 is connected to one end of the capacitor C14; the other end of the capacitor C14 is simultaneously connected to one end of the secondary winding of the transformer Q4 and to LGND; the negative electrodes of the diodes D9, D10, D11 and D12 are simultaneously connected to one end of the capacitor C24; at the same time, one end of the capacitor C24 is connected to the feedback voltage stabilization circuit, one end of the resistor R39 and one end of the inductor L3; the other end of the capacitor C24 is connected to the other end of the resistor R39, the other end of the capacitor C25, the other end of the capacitor C26 and one end of the secondary coil of the transformer GM3; the other end of the inductor L3 is connected to one end of the capacitor C25, one end of the capacitor C26 and one end of the primary coil of the transformer GM3; the other end of the primary coil of the transformer GM3 is connected to one end of the capacitor C27 and one end of the resistor R40; the other end of the secondary coil of the transformer GM3 is connected to the other end of the capacitor C27 and the other end of the resistor R40; one end of the capacitor C27 is externally connected to the positive electrode of VI; the other end of the capacitor C27 is externally connected to the negative electrode of VI; the other end of the capacitor C25 is connected to LGND; both ends of the capacitor C28 are grounded; the capacitor C28 absorbs static electricity; it is a small-capacity high-voltage capacitor.

[0060] The power supply startup circuit includes resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, diode D1, diode D2, diode D3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, MOS transistor Q1 and MOS transistor Q2;

[0061] One end of the resistor R1 is connected to the other end of the auxiliary winding of the transformer Q4; the other end of the resistor R1 is connected to the positive electrode of the diode D1; the negative electrode of the diode D1 is respectively connected to one end of the capacitor C1, one end of the resistor R2 and one end of the resistor R3; the other end of the capacitor C1 is grounded; the other ends of the resistor R2 and the resistor R3 are simultaneously connected to the negative electrode of the diode D3 and one end of the capacitor C4, and one end of the capacitor C4 is externally connected to VCC; the other end of the capacitor C4 is respectively connected to the positive electrode of the diode D3 and the source electrode of the MOS transistor Q2; the drain electrode of the MOS transistor Q2 is connected to the gate electrode of the MOS transistor Q1 and the other end of the resistor R7; the negative electrode of the diode D3 is connected to the source electrode of the MOS transistor Q1; the drain electrode of the MOS transistor Q1 is connected to one end of the resistor R4; one end of the resistor R4 is connected to the negative electrode of the diode D4, the negative electrode of the diode D5 and one end of the capacitor C8; the other end of the resistor R4 is connected to one end of the resistor R5; the other end of the resistor R5 is connected to one end of the resistor R6; the other end of the resistor R6 is connected to one end of the resistor R7; one end of the resistor R7 is connected to the negative electrode of the diode D2, one end of the resistor R8 and one end of the capacitor C2; the positive electrode of the diode D2, the other end of the resistor R8 and the other end of the capacitor C2 are simultaneously connected to the other end of the capacitor C3; one end of the capacitor C3 is connected to the gate electrode of the MOS transistor Q2 and one end of the resistor R9; the other end of the resistor R9 is externally connected to a 5V voltage; the other end of the capacitor C3 is grounded; the source electrode of the MOS transistor Q2 is grounded.

[0062] The control drive circuit includes resistor R25, resistor R26, resistor R27, resistor R28, resistor R29, resistor R30, resistor R31, diode D14, diode D15, diode D16, capacitor C22, capacitor C23, integrated chip U1, MOS transistor Q3 and resistor R16;

[0063] The positive electrode of the diode D8 is connected to the drain of the MOS transistor Q3; the source of the MOS transistor Q3 is connected to one end of the resistor R16; the gate of the MOS transistor Q3 is connected to the other end of the resistor R28; the other end of the resistor R16 is grounded; the positive electrode of the diode D15 is connected to the positive electrode of the diode D16; the negative electrode of the diode D16 is grounded; the negative electrode of the diode D15 is connected to the other end of the resistor R26 and one end of the capacitor C23; one end of the resistor R26 is connected to one end of the resistor R27, one end of the resistor R28, and the other end of the resistor R25; one end of the resistor R25 is grounded; the other end of the resistor R27 is connected to the other end of the capacitor C23 and the VEE port of the integrated chip U1; the SINK port and the Source port of the integrated chip U1 are connected to the negative electrode of the diode D14 and one end of the resistor R29; the positive electrode of the diode D14 and the other end of the resistor R29 are simultaneously connected to the other end of the resistor R28; the other end of the resistor R28 is connected to the gate of the MOS transistor Q3; the IN port of the integrated chip U1 is connected to one end of the resistor R30; the VCC port of the integrated chip U1 is connected to one end of the resistor R31; the VCC port of the integrated chip U1 is externally connected to the VCC power supply and one end of the capacitor C22; the other end of the capacitor C22 is grounded; the other end of the resistor R30 and the other end of the resistor R31 are simultaneously connected to the control circuit.

[0064] The control circuit includes a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37, a resistor R38, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, and an integrated chip U2;

[0065] The resistors R35, R36, R37, and R38 are connected in series in sequence; one end of the resistor R35 is connected to one end of the resistor R4, the negative electrode of the diode D4, the negative electrode of the diode D5, and one end of the capacitor C8; one end of the resistor R38 is connected to one end of the resistor R34; the other end of the resistor R34 is externally connected to a 5V voltage and one end of the resistor R33; the other end of the resistor R33 is connected to one end of the capacitor C19, one end of the capacitor C20, and the Rt / Ct port of the integrated chip U2; the other end of the capacitor C19 is grounded; the other end of the capacitor C20 is connected to one end of the resistor R34, one end of the capacitor C21, and the Isense port of the integrated chip U2; the other end of the capacitor C21 is grounded; the Vfb port of the integrated chip U2 is grounded; the COMP port of the integrated chip U2 is connected to a feedback voltage stabilization circuit; the GND port of the integrated chip U2 is grounded; the OUTPUT port of the integrated chip U2 is connected to the other end of the resistor R30; the VCC port of the integrated chip U2 is connected to the other end of the resistor R31; the Vref port of the integrated chip U2 is connected to one end of the resistor R32, one end of the capacitor C18, and a 5V voltage; the other ends of the capacitor C18 and the capacitor C17 are grounded simultaneously; one end of the capacitor C17 is connected to the other end of the resistor R31; the other end of the resistor R32 is connected to the feedback voltage stabilization circuit.

[0066] The feedback voltage stabilization circuit includes resistors R17, R18, R19, R20, R21, R22, R23, capacitors C15, C18, C16, diodes D13, D17, and an optocoupler D18;

[0067] One end of the resistor R17 is connected to one end of the resistor R18, one end of the resistor R22, and the optocoupler D18; the optocoupler D18 is simultaneously connected to the other end of the resistor R22 and the positive electrode of the diode D13; the negative electrode of the diode D13 is connected to one end of the resistor R20 and one end of the capacitor C24; the other end of the resistor R20 is connected to one end of the resistor R21, the other end of the capacitor C15, and the negative electrode of the diode D17; the other end of the capacitor R21 is connected to the positive electrode of the diode D17 and connected to LGND; the negative electrode of the diode D17 is connected to the other end of the resistor R17, the other end of the resistor R18, and one end of the resistor R19; the other end of the resistor R19 is connected to one end of the capacitor C15; the other end of the capacitor C16 is connected to one end of the resistor R23; the other end of the resistor R23 is grounded; one end of the capacitor C16 is connected to the other end of the resistor R32 and the COMP port of the integrated chip U2; at the same time, one end of the capacitor C16 is connected to the optocoupler D18, and one end of the optocoupler D18 is grounded.

[0068] The power startup circuit, EMI circuit, input rectifier circuit, spike absorption circuit, output rectifier and filter circuit, control and drive circuit, control circuit, and feedback voltage regulation circuit are all arranged in the three-dimensional structure of a "double-layer board" composed of a polyimide circuit board and an ALN ceramic circuit board; synthetic graphite and thermal grease are pasted in the power startup circuit, EMI circuit, input rectifier circuit, spike absorption circuit, output rectifier and filter circuit, control and drive circuit, control circuit, and feedback voltage regulation circuit; high-temperature insulating and thermally conductive potting glue is used to fill the gaps between each circuit and the circuit board.

[0069] See Figure 8 、 Figure 9 (a)、 Figure 9 (b)、 Figure 10 and Figure 11 ; To further enhance the heat dissipation effect of the power module, the power startup circuit, EMI circuit, input rectifier circuit, spike absorption circuit, output rectifier and filter circuit, control and drive circuit, control circuit, and feedback voltage regulation circuit are all arranged in the three-dimensional structure of a "double-layer board" composed of a polyimide circuit board and an ALN ceramic circuit board; synthetic graphite and thermal grease are filled in the power startup circuit, EMI circuit, input rectifier circuit, spike absorption circuit, output rectifier and filter circuit, control and drive circuit, control circuit, and feedback voltage regulation circuit; high-temperature insulating and thermally conductive potting glue is used to fill the gaps between each circuit and the circuit board.

[0070] Among them, the control part and signal part of the power startup circuit, EMI circuit, input rectifier circuit, spike absorption circuit, output rectifier and filter circuit, control and drive circuit, control circuit, and feedback voltage regulation circuit are placed on the polyimide substrate; power-consuming components with high heat generation such as the transformer Q4, power devices, and power switch devices in the EMI circuit, input rectifier circuit, and output rectifier and filter circuit are placed on the ALN ceramic substrate.

[0071] The commonly used high-temperature board polyimide at the present stage has a thermal conductivity of only below 0.2 W / (m·K), while the ceramic substrate has very excellent thermal conductivity. The thermal conductivity of the alumina ceramic substrate is about 25 - 30 W / (m·K), the silicon nitride ceramic substrate is about 80 - 90 W / (m·K), and the thermal conductivity of the aluminum nitride ceramic substrate is even as high as above 170 W / (m·K). The design of the double-layer three-dimensional structure of the polyimide circuit board and the ceramic circuit board not only meets the requirements of a large number of components and complex layout and wiring on the power board but also meets the requirements of heat dissipation and heat conduction of power devices. Moreover, the polyimide circuit board adopts an irregular hollow structure, which can effectively reduce the height of component placement, reduce the volume of the power module, and achieve miniaturization and light weight.

[0072] At the same time, synthetic graphite is adopted to solve the problem of uneven heat generation of power devices. Its transverse thermal conductivity of over 1500 W / (m·K) can ensure uniform surface packaging temperature of power devices, increase the longitudinal heat dissipation area, and cooperate with thermal grease to make the power devices closely adhere to the metal skeleton, achieving the purpose of accelerating heat dissipation of power devices, increasing working stability and working life. At the same time, an insulating and thermally conductive potting adhesive is used to pot the power module, which helps with the heat dissipation of the entire circuit board and the function of fixing and insulating and protecting components, providing guarantee for the insulation and seismic resistance requirements of the power module.

[0073] The present invention solves the problem of power supply for logging instruments in extreme downhole environments, and proposes an AC-DC high-temperature switching power supply module with an output voltage of 36V, a power of about 50W, and capable of stably operating for more than 60 hours in an extreme high-temperature environment of 175°C.

[0074] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-temperature resistant AC-DC power module, characterized in that, Comprising: A power startup circuit, an EMI circuit, an input rectification circuit, a spike absorption circuit, a transformer Q4, an output rectification and filtering circuit, a control and drive circuit, a control circuit, and a feedback voltage regulation circuit; The EMI circuit is externally connected to an alternating current of 220V; the EMI circuit is connected to the input rectification circuit; the input rectification circuit is connected to the power startup circuit; the power startup circuit is connected to the control circuit and the control and drive circuit; the control circuit is connected to the control and drive circuit; the control and drive circuit is connected to the transformer Q4; the transformer Q4 is respectively connected to the power startup circuit, the input rectification circuit, the spike absorption circuit, and the output rectification and filtering circuit; the output rectification and filtering circuit is connected to the feedback voltage regulation circuit; the feedback voltage regulation circuit is connected to the control circuit; the input rectification circuit is connected to the control circuit; the spike absorption circuit is connected to the input rectification circuit; the output rectification and filtering circuit outputs a direct current of 36V.

2. The high-temperature resistant AC-DC power module according to claim 1, characterized in that The EMI circuit includes: an inductor L1, an inductor L2, a capacitor C5, a capacitor C6, a capacitor C7, a common mode transformer GM1, and a common mode transformer GM2; One end of the primary coil of the common mode transformer GM1 is connected to an input voltage of 220V; the other end of the primary coil of the common mode transformer GM1 is connected to one end of the inductor L1 and one end of the capacitor C5; the other end of the inductor L1 is connected to one end of the capacitor C6 and one end of the primary coil of the common mode transformer GM2; one end of the secondary coil of the common mode transformer GM1 is connected to an output voltage of 220V; the other end of the secondary coil of the common mode transformer GM1 is connected to one end of the inductor L2 and the other end of the capacitor C5; the other end of the inductor L2 is connected to the other end of the capacitor C6 and one end of the secondary coil of the common mode transformer GM2; the other end of the secondary coil of the common mode transformer GM2 is connected to the other end of the capacitor C7 and the input rectification circuit; the other end of the primary coil of the common mode transformer GM2 is connected to one end of the capacitor C7 and the input rectification circuit.

3. The high-temperature resistant AC-DC power module according to claim 2, wherein, The input rectification circuit includes diodes D4, D5, D6, D7, capacitors C8, C9, C10, C11, and C12; The positive electrode of the diode D4 is connected to the negative electrode of the diode D6; the positive electrode of the diode D5 is connected to the negative electrode of the diode D7; the negative electrodes of the diodes D4 and D5 and one end of the capacitor C8 are connected to the power startup circuit and the control circuit; the negative electrodes of the diodes D4 and D5 and one end of the capacitor C8 are simultaneously connected to the spike absorption circuit; the other end of the capacitor C8 is connected to one end of the capacitor C9; the other end of the capacitor C9 is connected to one end of the capacitor C10, the other end of the capacitor C10 is connected to one end of the capacitor C11, the other end of the capacitor C11 is connected to one end of the capacitor C12, the other end of the capacitor C12, the positive electrodes of the diodes D6 and D7 are commonly grounded; the positive electrode of the diode D4 and the negative electrode of the diode D6 are commonly connected to one end of the capacitor C7; the positive electrode of the diode D5 and the negative electrode of the diode D7 are commonly connected to the other end of the capacitor C7.

4. The high-temperature resistant AC-DC power module according to claim 3, characterized in that The spike absorption circuit includes resistor R10, resistor R11, resistor R12, resistor R13, resistor R14, capacitor C13, and diode D8; One end of resistor R10 is connected to the other end of resistor R11; one end of resistor R13 is connected to the other end of resistor R14; the other end of resistor R12 is connected to one end of capacitor C13; the other end of capacitor C13, the other end of resistor R13, and the other end of resistor R10 are commonly connected to one end of capacitor C8; one end of resistor R11, one end of resistor R12, and one end of resistor R14 are commonly connected to the negative electrode of diode D8; the positive electrode of diode D8 is connected to one end of the main winding of transformer Q4; one end of capacitor C8 is connected to the other end of the main winding of transformer Q4; one end of the auxiliary winding of transformer Q4 is grounded; the other end of the auxiliary winding of transformer Q4 is connected to the power supply startup circuit; the positive electrode of diode D8 is connected to the control drive circuit; Both ends of the secondary winding of transformer Q4 are connected to the output rectifying and filtering circuit; one end of the secondary winding of transformer Q4 is grounded.

5. The high-temperature resistant AC-DC power module according to claim 4, wherein The output rectifying and filtering circuit includes resistor R39, resistor R40, capacitor C24, capacitor C25, capacitor C26, capacitor C27, capacitor C28, inductor L3, transformer GM3, resistor R15, diode D9, diode D10, diode D11, diode D12, and capacitor C14; The other end of the secondary winding of transformer Q4 is respectively connected to the positive electrodes of diode D9, diode D10, diode D11, and diode D12; the negative electrodes of diode D9, diode D10, diode D11, and diode D12 are simultaneously connected to one end of resistor R15; the other end of resistor R15 is connected to one end of capacitor C14; the other end of capacitor C14 is simultaneously connected to one end of the secondary winding of transformer Q4 and LGND; the negative electrodes of diode D9, diode D10, diode D11, and diode D12 are simultaneously connected to one end of capacitor C24; at the same time, one end of capacitor C24 is connected to the feedback voltage stabilizing circuit, one end of resistor R39, and one end of inductor L3; the other end of capacitor C24 is connected to the other end of resistor R39, the other end of capacitor C25, the other end of capacitor C26, and one end of the secondary coil of transformer GM3; the other end of inductor L3 is connected to one end of capacitor C25, one end of capacitor C26, and one end of the primary coil of transformer GM3; the other end of the primary coil of transformer GM3 is connected to one end of capacitor C27 and one end of resistor R40; the other end of the secondary coil of transformer GM3 is connected to the other end of capacitor C27 and the other end of resistor R40; one end of capacitor C27 is externally connected to the positive electrode of VI; the other end of capacitor C27 is externally connected to the negative electrode of VI; the other end of capacitor C25 is connected to LGND; both ends of capacitor C28 are grounded; capacitor C28 absorbs static electricity; it is a small-capacity high-voltage capacitor.

6. The high-temperature resistant AC-DC power module according to claim 5, wherein, The power supply startup circuit includes resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, diode D1, diode D2, diode D3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, MOS transistor Q1 and MOS transistor Q2; One end of the resistor R1 is connected to the other end of the auxiliary winding of the transformer Q4; the other end of the resistor R1 is connected to the positive electrode of the diode D1; the negative electrode of the diode D1 is respectively connected to one end of the capacitor C1, one end of the resistor R2 and one end of the resistor R3; the other end of the capacitor C1 is grounded; the other ends of the resistor R2 and the resistor R3 are simultaneously connected to the negative electrode of the diode D3 and one end of the capacitor C4, and one end of the capacitor C4 is externally connected to VCC; the other end of the capacitor C4 is respectively connected to the positive electrode of the diode D3 and the source electrode of the MOS transistor Q2; the drain electrode of the MOS transistor Q2 is connected to the gate electrode of the MOS transistor Q1 and the other end of the resistor R7; the negative electrode of the diode D3 is connected to the source electrode of the MOS transistor Q1; the drain electrode of the MOS transistor Q1 is connected to one end of the resistor R4; one end of the resistor R4 is connected to the negative electrode of the diode D4, the negative electrode of the diode D5 and one end of the capacitor C8; the other end of the resistor R4 is connected to one end of the resistor R5; the other end of the resistor R5 is connected to one end of the resistor R6; the other end of the resistor R6 is connected to one end of the resistor R7; one end of the resistor R7 is connected to the negative electrode of the diode D2, one end of the resistor R8 and one end of the capacitor C2; the positive electrode of the diode D2, the other end of the resistor R8 and the other end of the capacitor C2 are simultaneously connected to the other end of the capacitor C3; one end of the capacitor C3 is connected to the gate electrode of the MOS transistor Q2 and one end of the resistor R9; the other end of the resistor R9 is externally connected to a 5V voltage; the other end of the capacitor C3 is grounded; the source electrode of the MOS transistor Q2 is grounded.

7. The high-temperature resistant AC-DC power module according to claim 6, characterized in that, The control drive circuit includes resistor R25, resistor R26, resistor R27, resistor R28, resistor R29, resistor R30, resistor R31, diode D14, diode D15, diode D16, capacitor C22, capacitor C23, integrated chip U1, MOS transistor Q3 and resistor R16; The positive electrode of the diode D8 is connected to the drain of the MOS transistor Q3; the source of the MOS transistor Q3 is connected to one end of the resistor R16; the gate of the MOS transistor Q3 is connected to the other end of the resistor R28; the other end of the resistor R16 is grounded; the positive electrode of the diode D15 is connected to the positive electrode of the diode D16; the negative electrode of the diode D16 is grounded; the negative electrode of the diode D15 is connected to the other end of the resistor R26 and one end of the capacitor C23; one end of the resistor R26 is connected to one end of the resistor R27, one end of the resistor R28, and the other end of the resistor R25; one end of the resistor R25 is grounded; the other end of the resistor R27 is connected to the other end of the capacitor C23 and the VEE port of the integrated chip U1; the SINK port and the Source port of the integrated chip U1 are connected to the negative electrode of the diode D14 and one end of the resistor R29; the positive electrode of the diode D14 and the other end of the resistor R29 are simultaneously connected to the other end of the resistor R28; the other end of the resistor R28 is connected to the gate of the MOS transistor Q3; the IN port of the integrated chip U1 is connected to one end of the resistor R30; the VCC port of the integrated chip U1 is connected to one end of the resistor R31; the VCC port of the integrated chip U1 is externally connected to the VCC power supply and one end of the capacitor C22; the other end of the capacitor C22 is grounded; the other end of the resistor R30 and the other end of the resistor R31 are simultaneously connected to the control circuit.

8. The high-temperature resistant AC-DC power module according to claim 7, characterized in that, The control circuit includes a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37, a resistor R38, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, and an integrated chip U2; The resistors R35, R36, R37, and R38 are connected in series in sequence; one end of the resistor R35 is connected to one end of the resistor R4, the negative electrode of the diode D4, the negative electrode of the diode D5, and one end of the capacitor C8; one end of the resistor R38 is connected to one end of the resistor R34; the other end of the resistor R34 is externally connected to a 5V voltage and one end of the resistor R33; the other end of the resistor R33 is connected to one end of the capacitor C19, one end of the capacitor C20, and the Rt / Ct port of the integrated chip U2; the other end of the capacitor C19 is grounded; the other end of the capacitor C20 is connected to one end of the resistor R34, one end of the capacitor C21, and the Isense port of the integrated chip U2; the other end of the capacitor C21 is grounded; the Vfb port of the integrated chip U2 is grounded; the COMP port of the integrated chip U2 is connected to the feedback voltage stabilizing circuit; the GND port of the integrated chip U2 is grounded; the OUTPUT port of the integrated chip U2 is connected to the other end of the resistor R30; the VCC port of the integrated chip U2 is connected to the other end of the resistor R31; the Vref port of the integrated chip U2 is connected to one end of the resistor R32, one end of the capacitor C18, and the 5V voltage; the other ends of the capacitor C18 and the capacitor C17 are grounded simultaneously; one end of the capacitor C17 is connected to the other end of the resistor R31; the other end of the resistor R32 is connected to the feedback voltage stabilizing circuit.

9. The high-temperature resistant AC-DC power module according to claim 8, wherein, The feedback voltage stabilizing circuit includes resistors R17, R18, R19, R20, R21, R22, R23, capacitors C15, C18, C16, diodes D13, D17, and optocoupler D18; One end of the resistor R17 is connected to one end of the resistor R18, one end of the resistor R22, and the optocoupler D18; the optocoupler D18 is simultaneously connected to the other end of the resistor R22 and the positive electrode of the diode D13; the negative electrode of the diode D13 is connected to one end of the resistor R20 and one end of the capacitor C24; the other end of the resistor R20 is connected to one end of the resistor R21, the other end of the capacitor C15, and the negative electrode of the diode D17; the other end of the capacitor R21 is connected to the positive electrode of the diode D17 and connected to LGND; the negative electrode of the diode D17 is connected to the other end of the resistor R17, the other end of the resistor R18, and one end of the resistor R19; the other end of the resistor R19 is connected to one end of the capacitor C15; the other end of the capacitor C16 is connected to one end of the resistor R23; the other end of the resistor R23 is grounded; one end of the capacitor C16 is connected to the other end of the resistor R32 and the COMP port of the integrated chip U2; at the same time, one end of the capacitor C16 is connected to the optocoupler D18, and one end of the optocoupler D18 is grounded.

10. The high-temperature resistant AC-DC power module according to claim 9, characterized in that, The power supply startup circuit, EMI circuit, transformer Q4, input rectification circuit, spike absorption circuit, output rectification and filtering circuit, control drive circuit, control circuit, and feedback voltage stabilizing circuit are all arranged in the "double-layer board" three-dimensional structure composed of a polyimide circuit board and an ALN ceramic circuit board; Artificial graphite and thermal conductive silicone grease are pasted in the power supply startup circuit, EMI circuit, input rectification circuit, spike absorption circuit, output rectification and filtering circuit, control and drive circuit, control circuit and feedback voltage stabilization circuit; high-temperature insulating and thermal conductive potting glue is used to fill the gaps between each circuit and the circuit board.

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