Surge-resistant, low-ripple, scalable multi-channel DC-DC power supply

Abstract

The present invention discloses a surge-resistant, low-ripple, scalable multi-channel DC-DC power supply, comprising an input filter circuit unit for receiving the input voltage of a preceding circuit signal, processing harmonic pollution in the input voltage and reducing interference, and sending the processed input voltage to an anti-surge circuit unit; an anti-surge circuit unit for monitoring the input voltage, activating when the input voltage suddenly rises or drops, obtaining a stable input voltage, and sending the voltage to a power conversion unit; a power conversion unit for converting the input voltage of 27V into ±12V, ±6V, analog A5V, digital D5V, and -135V voltages, and outputting them to corresponding output filter units; and an output filter unit for processing and outputting the converted voltage according to the ripple requirements of each power supply. The present invention has surge protection, input overvoltage protection, input undervoltage protection, and output short-circuit protection.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply circuits, and in particular relates to a surge-resistant, low-ripple, expandable multi-channel DC-DC power supply. Background Art

[0002] Certain industries require multi-channel DC-DC power supply modules, which have special requirements for harmonics, ripple, surge protection, and anti-interference. Conventional design methods are difficult to meet these requirements. The instantaneous current at startup is large, which causes significant interference to the primary power supply and affects the normal operation of other branch circuits. In addition, when multiple power supplies are integrated into one, the mutual interference is relatively large, and the load regulation rate and current regulation rate of each output are significantly increased. Summary of the Invention

[0003] In view of this, the main object of the present invention is to provide a surge-resistant, low-ripple, expandable multi-channel DC-DC power supply.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] The embodiment of the present invention provides an anti-surge low-ripple expandable multi-channel DC-DC power supply, comprising an input filter circuit unit, an anti-surge circuit unit, a power conversion unit, and an output filter unit;

[0006] The input filter circuit unit is used to receive the input voltage of the previous stage circuit signal, process the harmonic pollution in the input voltage and reduce interference, and send the processed input voltage to the anti-surge circuit unit; the anti-surge circuit unit is used to monitor the input voltage and start when the input voltage suddenly rises or drops, obtain a stable input voltage and send it to the power conversion unit;

[0007] The power conversion unit is used to convert the input voltage of 27V into ±12V, ±6V, analog A5V, digital D5V and -135V voltages and output them to the corresponding output filter units respectively;

[0008] The output filtering unit is used to process and output the converted voltage according to the ripple requirements of each power supply.

[0009] In the above scheme, the input filter circuit unit includes a first diode D1, a first filter capacitor Cin1, a second filter capacitor Cin2, a first capacitor C1, a second capacitor C2, a first inductor L0, and a second inductor L1. The two input ends of the first inductor L0 are respectively connected to the input voltages Vin+ and Vin-, and one output end is used for outputting the voltage Vout+ through the second inductor L1, and the other output end is used for outputting the voltage Vout-. The first diode D1 and the first filter capacitor Cin1 are connected in parallel between the two input ends of the first inductor L0, and the second filter capacitor Cin2, the first capacitor C1, and the second capacitor C2 are connected in parallel between the two output ends of the first inductor L0.

[0010] In the above solution, the surge protection circuit unit includes a first chip U1, a first resistor R0 to a ninth resistor R8, a first transistor Q1, and a third capacitor C3. The first terminal of the first chip U1 is connected to the output voltage Vout+ of the input filter circuit unit through the first resistor R0 as the input voltage Vin+, and the other terminal is used to output the voltage Vout+ through the first transistor Q1. The second terminal is connected between the first resistor R0 and the input voltage Vin+. The fifth terminal is connected to the output voltage Vout- of the input filter circuit unit as the input voltage Vin-, and the other terminal is used to output the voltage Vout-. The 6th terminal is connected to the output voltage Vout- side through the third capacitor C3, the 7th terminal is connected to the output voltage Vout- side through the eighth resistor R7, the 8th terminal is connected to the output voltage Vout+ side through the ninth resistor R8, and the 9th terminal is connected to the ninth resistor R8 side. The second resistor R1, the third resistor R2, and the fourth resistor R4 are connected in parallel between the 2nd and 5th terminals of the first chip U1, and the fifth resistor R4, the sixth resistor R5, and the seventh resistor R6 are also connected in parallel. The 3rd terminal of the first chip U1 is connected between the second resistor R1 and the third resistor R2, and the 4th terminal is connected between the fifth resistor R4 and the sixth resistor R5.

[0011] In the above scheme, the power conversion unit includes a 27V / +12V conversion unit, a 27V / -12V conversion unit, a 27V / +6V conversion unit, a 27V / -6V conversion unit, a 27V / A5V conversion unit, a 27V / D5V conversion unit, and a 27V / -135V conversion unit, and the 27V / +12V conversion unit, the 27V / -12V conversion unit, the 27V / +6V conversion unit, the 27V / -6V conversion unit, the 27V / A5V conversion unit, the 27V / D5V conversion unit, and the 27V / -135V conversion unit are respectively connected to the anti-surge circuit unit.

[0012] In the above scheme, the 27V / +12V conversion unit, the 27V / -12V conversion unit, the 27V / +6V conversion unit, the 27V / -6V conversion unit, the 27V / A5V conversion unit, and the 27V / D5V conversion unit all include a second chip U2, a third chip U3, a fourth capacitor C4 to a nineteenth capacitor C19, a tenth resistor R9 to a twenty-sixth resistor R25, a third inductor L2, a fourth inductor L3, a second transistor Q2, a second diode D2, and a third diode D3. The first path of the transformer is connected to the fourth terminal of the second chip U2 via the second diode D2 and the twenty-first resistor R20, and the second path is connected to the output voltage Vout- of the anti-surge circuit unit as the input voltage Vin- and The output voltage Vout+ of the anti-surge circuit unit is connected to the third path through the third inductor L2 as the input voltage Vin+, the fourth path is connected to the third diode D3 and the fourth inductor L3 as the output voltage Vout+, the fifth path is used as the output voltage Vout-, the eleventh capacitor C11 is connected in parallel between the first path and the second path, the twelfth capacitor C12 is connected in parallel between the first path and the third path, the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel between the second path and the third path, and the thirteenth capacitor C13, the fourteenth capacitor C14, the eighteenth capacitor C18 and the nineteenth capacitor C19 are connected in parallel between the fourth path and the fifth path; the first end of the second chip U2 is connected to one side of the fourth capacitor C4 through the sixth capacitor C6, and the second end is connected to the fourth On one side of the capacitor C4, the 10th terminal is connected to the side of the fourth capacitor C4 via the eighth capacitor C8, the 9th terminal is connected to the side of the fourth capacitor C4 via the thirteenth resistor R12, the 7th terminal is connected to the 8th terminal through the eleventh resistor R10, the eighth resistor R7, and the ninth resistor R8, and is connected to the 8th terminal through the twelfth resistor R11 and the nineteenth resistor R18. The 6th terminal is connected between the twelfth resistor R11 and the nineteenth resistor R18. The 5th terminal is connected to the 4th terminal of the second transistor Q2 through the fourteenth resistor R13. The 8th terminal is connected to the 4th terminal of the second transistor Q2 through the seventeenth resistor R16 and the eighteenth resistor R17, and is connected to the 4th terminal of the second transistor Q2 through the fifteenth resistor R14. The other path is connected to the 1st, 2nd, and 3rd terminals of the second transistor Q2. The 5th terminal of the second transistor Q2 is connected to the 5th terminal of the second transistor Q2. , 6, 7, and 8 terminals are connected to the transformer, and the 3rd terminal of the second chip U2 is connected to the third chip U3; the U3B side of the third chip U3 is connected in parallel with the 20th resistor R19 and the 10th capacitor C10, and the U3B side is also connected to the 7th capacitor C7 side after passing through the 19th resistor R18 side, the 10th capacitor C10 side, the 6th terminal of the second chip U2, the 13th resistor R12 side, and the 12th resistor R11 side. The U3A side is connected to the 14th capacitor C14 side through the 22nd resistor R21 and the 23rd resistor R22 connected in parallel, and is connected to the 4th inductor L3 side through the 16th capacitor C16, the 25th resistor R24, and the 24th resistor R23. The U3A side and the U3B side are also connected through the 15th capacitor C15.One side of the thirteenth resistor R12 is connected between the twelfth resistor R11 and the nineteenth resistor R18, and the fifth capacitor C5 is connected in parallel to the twelfth resistor R11.

[0013] In the above scheme, the 27V / -135V conversion unit includes the 20th capacitor C20 to the 31st capacitor C31, the first varistor Z1 to the third varistor Z3, the 27th resistor R26 to the 38th resistor R37, the fourth diode D4 to the sixth diode D6, the fourth chip U4, and the third transistor Q3. The 8th terminal of the fourth chip U4 is firstly connected to the output voltage Vout+ of the anti-surge circuit unit as the input voltage Vin+, and the second path is connected through the third transistor Q3 and the 23rd capacitor C23 The output voltage Vout- of the anti-surge circuit unit is connected as the input voltage Vin-. The 20th capacitor C2, the 21st capacitor C21, and the 38th resistor R38 and the third varistor Z3 are connected in parallel between the first path and the second path in sequence. One end of the third transistor Q3 is connected between the 38th resistor R38 and the third varistor Z3. The third path is grounded via the 22nd capacitor C22. The 8th end of the fourth path, the 9th end, the 10th end, and the 7th end are connected to one side of the transformer. The 2nd end is connected to the 27th resistor R26. The 14th terminal is grounded via the 25th capacitor C25, the 4th and 6th terminals are connected to the optocoupler U4B, one side of the other side of the transformer is grounded via the 6th diode D6 and the 5th inductor L5, and the other side outputs a -135V voltage. The 27th capacitor C27, the 28th capacitor C28, the 29th capacitor C29, the 30th capacitor C30, and the 30th resistor R29 and the 31st resistor R30 are connected in parallel between the two sides, and the first varistor Z1, the second varistor Z2, the 29th resistor R28, The optocoupler U4A and the controllable precision voltage-stabilizing source U5 are connected in parallel between the two paths on the other side of the transformer. The thirty-second resistor R31, the thirty-third resistor R32, the thirty-fourth resistor R33, the thirty-fifth resistor R34, the thirty-sixth resistor R35, and the thirty-seventh resistor R36, which are connected in sequence, are connected in parallel between the two paths on the other side of the transformer. The thirty-eighth resistor R37 and the twelfth capacitor C12, which are connected in series, have one end connected between the optocoupler U4A and the controllable precision voltage-stabilizing source U5, and the other end connected between the thirty-sixth resistor R35 and the thirty-seventh resistor R36.

[0014] In the above scheme, the output filter unit includes a +12V output filter unit, a -12V output filter unit, a +6V output filter unit, a -6V output filter unit, an A5V output filter unit, a D5V output filter unit, a -135V output filter unit, and a -135V telemetry unit. The -12V output filter unit, the +6V output filter unit, the -6V output filter unit, the A5V output filter unit, the D5V output filter unit, and the -135V output filter unit are respectively connected to the corresponding power conversion units, the -135V telemetry unit is connected to the 27V / -135V conversion unit, and the +12V output filter unit, the -12V output filter unit, the +6V output filter unit, the -6V output filter unit, the A5V output filter unit, the D5V output filter unit, the -135V output filter unit, and the -135V telemetry unit are commonly grounded.

[0015] Compared with the existing technology, the present invention can convert the input DC 27V into 7 output voltages including ±12V, ±6V, D5V, A5V and -135V. The output power supplies share a common ground and have anti-surge function, input overvoltage, undervoltage and output short-circuit protection functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings described herein are used to further understand the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 A principle block diagram of a surge-resistant, low-ripple, scalable multi-channel DC-DC power supply is provided for an embodiment of the present invention;

[0018] Figure 2 A circuit diagram of an input filter circuit unit in an anti-surge, low-ripple, scalable multi-channel DC-DC power supply is provided for an embodiment of the present invention;

[0019] Figure 3 A circuit diagram of an anti-surge circuit unit in an anti-surge, low-ripple, scalable multi-channel DC-DC power supply is provided for an embodiment of the present invention;

[0020] Figure 4 A circuit diagram of a 27V / +12V conversion unit, a 27V / -12V conversion unit, a 27V / +6V conversion unit, a 27V / -6V conversion unit, a 27V / A5V conversion unit, and a 27V / D5V conversion unit in a surge-resistant, low-ripple, scalable multi-channel DC-DC power supply is provided in an embodiment of the present invention;

[0021] Figure 5 A circuit diagram of a 27V / -135V conversion unit in a surge-resistant, low-ripple, scalable multi-channel DC-DC power supply is provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, article, or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, article, or device comprising the element.

[0025] The embodiment of the present invention provides a surge-resistant, low-ripple, scalable multi-channel DC-DC power supply, such as Figure 1 As shown, it includes an input filter circuit unit, an anti-surge circuit unit, a power conversion unit and an output filter unit;

[0026] The input filter circuit unit is used to receive the input voltage of the previous stage circuit signal, process the harmonic pollution in the input voltage and reduce interference, and send the processed input voltage to the anti-surge circuit unit;

[0027] The anti-surge circuit unit is used to monitor the input voltage and start when the input voltage suddenly rises or drops, obtains a stable input voltage and sends it to the power conversion unit;

[0028] The power conversion unit is used to convert the input voltage of 27V into ±12V, ±6V, analog A5V, digital D5V and -135V voltages and output them to the corresponding output filter units respectively;

[0029] The output filtering unit is used to process and output the converted voltage according to the ripple requirements of each power supply.

[0030] like Figure 2 As shown, the input filter circuit unit includes a first diode D1, a first filter capacitor Cin1, a second filter capacitor Cin2, a first capacitor C1, a second capacitor C2, a first inductor L0, and a second inductor L1. The two input ends of the first inductor L0 are respectively connected to the input voltages Vin+ and Vin-, and one output end is used for outputting the voltage Vout+ through the second inductor L1, and the other output end is used for outputting the voltage Vout-. The first diode D1 and the first filter capacitor Cin1 are connected in parallel between the two input ends of the first inductor L0, and the second filter capacitor Cin2, the first capacitor C1, and the second capacitor C2 are connected in parallel between the two output ends of the first inductor L0.

[0031] The specific working process of the input filter unit circuit is as follows:

[0032] When the common-mode current flows through the first inductor L0, the two coupled inductors of the common-mode inductor generate magnetic fields in the same direction, increasing the inductance of the common-mode inductor, that is, increasing the inductive reactance to the common-mode current, so that the common-mode current is further suppressed, achieving the purpose of attenuating the common-mode current and playing a role in suppressing common-mode interference noise.

[0033] After the differential-mode current flows through the second inductor L1, the differential-mode inductor is connected in series with the second filter capacitor Cin2, the first capacitor C1, and the second capacitor C2 to form a loop. The differential-mode inductor has a large inductive reactance against high-frequency differential-mode interference, and Cin2, C1, and C2 have a small capacitive reactance against differential-mode interference. The differential-mode signal is bypassed to ground, thereby suppressing differential-mode high-frequency interference.

[0034] like Figure 3As shown, the surge protection circuit unit includes a first chip U1, a first resistor R0 to a ninth resistor R8, a first transistor Q1, and a third capacitor C3. The first terminal of the first chip U1 is connected to the output voltage Vout+ of the input filter circuit unit through the first resistor R0 as the input voltage Vin+, and the other terminal is used to output the voltage Vout+ through the first transistor Q1. The second terminal is connected between the first resistor R0 and the input voltage Vin+. The fifth terminal is connected to the output voltage Vout- of the input filter circuit unit as the input voltage Vin-, and the other terminal is used to output the voltage Vout-. The 6th terminal is connected to the output voltage Vout- side through the third capacitor C3, the 7th terminal is connected to the output voltage Vout- side through the eighth resistor R7, the 8th terminal is connected to the output voltage Vout+ side through the ninth resistor R8, and the 9th terminal is connected to the ninth resistor R8 side. The second resistor R1, the third resistor R2, and the fourth resistor R4 are connected in parallel between the 2nd and 5th terminals of the first chip U1, and the fifth resistor R4, the sixth resistor R5, and the seventh resistor R6 are also connected in parallel. The 3rd terminal of the first chip U1 is connected between the second resistor R1 and the third resistor R2, and the 4th terminal is connected between the fifth resistor R4 and the sixth resistor R5.

[0035] In order to make the module work reliably and prevent damage to the module due to excessively high or low input voltage, an anti-surge circuit unit is placed at the input end. The overvoltage protection point can be set by configuring R1, R2 and R3, and the undervoltage protection point can be set by configuring R4, R5 and R6.

[0036] The power conversion unit includes a 27V / +12V conversion unit, a 27V / -12V conversion unit, a 27V / +6V conversion unit, a 27V / -6V conversion unit, a 27V / A5V conversion unit, a 27V / D5V conversion unit, and a 27V / -135V conversion unit. The 27V / +12V conversion unit, the 27V / -12V conversion unit, the 27V / +6V conversion unit, the 27V / -6V conversion unit, the 27V / A5V conversion unit, the 27V / D5V conversion unit, and the 27V / -135V conversion unit are respectively connected to the anti-surge circuit unit.

[0037] like Figure 4As shown, the 27V / +12V conversion unit, the 27V / -12V conversion unit, the 27V / +6V conversion unit, the 27V / -6V conversion unit, the 27V / A5V conversion unit, and the 27V / D5V conversion unit all include a second chip U2, a third chip U3, a fourth capacitor C4 to a nineteenth capacitor C19, a tenth resistor R9 to a twenty-sixth resistor R25, a third inductor L2, a fourth inductor L3, a second transistor Q2, a second diode D2, and a third diode D3. The first path of the transformer is connected to the fourth terminal of the second chip U2 via the second diode D2 and the twenty-first resistor R20, and the second path is connected to the output voltage Vout- of the anti-surge circuit unit as the input voltage Vin- and is polarized. The third path is connected to the output voltage Vout+ of the anti-surge circuit unit through the third inductor L2 as the input voltage Vin+, the fourth path is connected to the third diode D3 and the fourth inductor L3 as the output voltage Vout+, the fifth path is used as the output voltage Vout-, the eleventh capacitor C11 is connected in parallel between the first path and the second path, the twelfth capacitor C12 is connected in parallel between the first path and the third path, the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel between the second path and the third path, and the thirteenth capacitor C13, the fourteenth capacitor C14, the eighteenth capacitor C18, and the nineteenth capacitor C19 are connected in parallel between the fourth path and the fifth path; the first end of the second chip U2 is connected to one side of the fourth capacitor C4 through the sixth capacitor C6, and the second end is connected to the fourth capacitor C4 side, the 10th terminal is connected to the side of the fourth capacitor C4 through the eighth capacitor C8, the 9th terminal is connected to the side of the fourth capacitor C4 through the thirteenth resistor R12, the 7th terminal is connected to the 8th terminal through the eleventh resistor R10, the eighth resistor R7, and the ninth resistor R8 in one path, and is connected to the 8th terminal through the twelfth resistor R11 and the nineteenth resistor R18 in another path, the 6th terminal is connected between the twelfth resistor R11 and the nineteenth resistor R18, the 5th terminal is connected to the 4th terminal of the second transistor Q2 through the fourteenth resistor R13, the 8th terminal is connected to the 4th terminal of the second transistor Q2 through the fifteenth resistor R14 after passing through the seventeenth resistor R16 and the eighteenth resistor R17, and the other path is connected to the 1st, 2nd, and 3rd terminals of the second transistor Q2. Terminals 6, 7, and 8 are connected to the transformer, and the third terminal of the second chip U2 is connected to the third chip U3; the U3B side of the third chip U3 is connected in parallel with the twentieth resistor R19 and the tenth capacitor C10. The U3B side is also connected to the seventh capacitor C7 after passing through the nineteenth resistor R18 side, the tenth capacitor C10 side, the sixth terminal of the second chip U2, the thirteenth resistor R12 side, and the twelfth resistor R11 side. The U3A side is connected to the fourteenth capacitor C14 side through the twenty-second resistor R21 and the twenty-third resistor R22 connected in parallel, and is connected to the fourth inductor L3 side through the sixteenth capacitor C16, the twenty-fifth resistor R24, and the twenty-fourth resistor R23. The U3A side and the U3B side are also connected through the fifteenth capacitor C15.One side of the thirteenth resistor R12 is connected between the twelfth resistor R11 and the nineteenth resistor R18, and the fifth capacitor C5 is connected in parallel to the twelfth resistor R11.

[0038] ±12V, ±6V, and A5V use a flyback topology, and the pulse width modulator uses LM50XX. The main differences lie in the design of the transformer, the selection of the primary-side switch tube, and the secondary-side rectifier diode. This circuit can convert the input 27V voltage to ±12V, ±6V, A5V, and D5V voltages.

[0039] The pressure conversion process is as follows:

[0040] When the LM50XX pulse width modulator detects input voltage, it starts to output PWM, driving the power switch (MOSFET) to operate. When the MOSFET is closed, energy is stored in the transformer's primary winding. When the MOSFET is open, the energy is released. The output is rectified by a diode and filtered by a capacitor and inductor before being output. A voltage and current feedback loop at the output adjusts the PWM duty cycle of the PWM output, stabilizing the output voltage within a specified range. This principle enables conversion between different voltages.

[0041] like Figure 5As shown, the 27V / -135V conversion unit includes the 20th capacitor C20 to the 31st capacitor C31, the first varistor Z1 to the third varistor Z3, the 27th resistor R26 to the 39th resistor R38, the fourth diode D4 to the sixth diode D6, the fourth chip U4, and the third transistor Q3. The 8th terminal of the fourth chip U4 is firstly connected to the output voltage Vout+ of the anti-surge circuit unit as the input voltage Vin+, and the second terminal is connected through the third transistor Q3 and the 23rd capacitor C23. The output voltage Vout- of the surge protection circuit unit serves as the input voltage Vin-. The 20th capacitor C2, the 21st capacitor C21, and the 39th resistor R38 and the third varistor Z3 are connected in parallel between the first and second paths, respectively. One end of the third transistor Q3 is connected between the 38th resistor R38 and the third varistor Z3. The third path is grounded via the 22nd capacitor C22. The 8th terminal, the 9th terminal, the 10th terminal, and the 7th terminal of the fourth path are connected to one side of the transformer. The 2nd terminal is grounded via the 27th resistor R26. , the 14th terminal is grounded through the 25th capacitor C25, the 4th and 6th terminals are connected to the optocoupler U4B, the other side of the transformer is grounded through the 6th diode D6 and the 5th inductor L5, and the other outputs a -135V voltage. The 27th capacitor C27, the 28th capacitor C28, the 29th capacitor C29, the 30th capacitor C30, and the 30th resistor R29 and the 31st resistor R30 are connected in parallel between the two paths, and the first varistor Z1, the second varistor Z2, the 29th resistor R28, the optocoupler U4B are connected in sequence. The optocoupler U4A and the controllable precision voltage-stabilizing source U5 are connected in parallel between the two paths on the other side of the transformer. The thirty-second resistor R31, the thirty-third resistor R32, the thirty-fourth resistor R33, the thirty-fifth resistor R34, the thirty-sixth resistor R35, and the thirty-seventh resistor R36, which are connected in sequence, are connected in parallel between the two paths on the other side of the transformer. The thirty-eighth resistor R37 and the twelfth capacitor C12, which are connected in series, have one end connected between the optocoupler U4A and the controllable precision voltage-stabilizing source U5, and the other end connected between the thirty-sixth resistor R35 and the thirty-seventh resistor R36.

[0042] The controllable precision voltage regulator U5 is used to provide a reference voltage.

[0043] The output filter unit includes a +12V output filter unit, a -12V output filter unit, a +6V output filter unit, a -6V output filter unit, an A5V output filter unit, a D5V output filter unit, a -135V output filter unit, and a -135V telemetry unit. The -12V output filter unit, the +6V output filter unit, the -6V output filter unit, the A5V output filter unit, the D5V output filter unit, and the -135V output filter unit are respectively connected to corresponding power conversion units. The -135V telemetry unit is connected to a 27V / -135V conversion unit, and the +12V output filter unit, the -12V output filter unit, the +6V output filter unit, the -6V output filter unit, the A5V output filter unit, the D5V output filter unit, the -135V output filter unit, and the -135V telemetry unit are commonly grounded.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A surge-resistant, low-ripple, expandable multi-channel DC-DC power supply, characterized in that: It includes an input filter circuit unit, an anti-surge circuit unit, a power conversion unit and an output filter unit; The input filter circuit unit is used to receive the input voltage of the previous stage circuit signal, process the harmonic pollution in the input voltage and reduce interference, and send the processed input voltage to the anti-surge circuit unit; The anti-surge circuit unit is used to monitor the input voltage and start when the input voltage suddenly rises or drops, obtains a stable input voltage and sends it to the power conversion unit; The power conversion unit is used to convert the input voltage of 27V into ±12V, ±6V, analog A5V, digital D5V and -135V voltages and output them to the corresponding output filter units respectively; The output filter unit is used to process and output the converted voltage according to the ripple requirements of each power supply; The power conversion unit includes a 27V / -135V conversion unit, and the 27V / -135V conversion unit includes a 20th capacitor C20 to a 31st capacitor C31, a first varistor Z1 to a third varistor Z3, a 27th resistor R26 to a 38th resistor R37, a fourth diode D4 to a sixth diode D6, a fourth chip U4, and a third transistor Q3. The 8th terminal of the fourth chip U4 is firstly connected to the output voltage Vout+ of the anti-surge circuit unit as the input voltage Vin+, and the second is connected to the third The transistor Q3 and the twenty-third capacitor C23 are connected to the output voltage Vout- of the anti-surge circuit unit as the input voltage Vin-. The twentieth capacitor C20 and the twenty-first capacitor C21, as well as the thirty-eighth resistor R38 and the third varistor Z3 connected in series are connected in parallel between the first path and the second path. One end of the third transistor Q3 is connected between the thirty-eighth resistor R38 and the third varistor Z3. The third path is grounded via the twenty-second capacitor C22. The eighth end, the fourth path, the ninth end, the tenth end, and the seventh end are connected to one side of the transformer. The second end The 14th terminal is grounded through the 27th resistor R26, the 25th capacitor C25 is grounded, the 4th and 6th terminals are connected to the optocoupler U4B, the other side of the transformer is connected to the ground through the 6th diode D6 and the 5th inductor L5, and the other side outputs a -135V voltage. The 27th capacitor C27, the 28th capacitor C28, the 29th capacitor C29, the 30th capacitor C30, and the 30th resistor R29 and the 31st resistor R30 are connected in parallel between the two sides, and the first varistor Z1, the second varistor Z2, the 29th capacitor C30 are connected in series. Resistor R28, optocoupler U4A, and controllable precision voltage-stabilizing source U5 are connected in parallel between the two paths on the other side of the transformer. The thirty-second resistor R31, the thirty-third resistor R32, the thirty-fourth resistor R33, the thirty-fifth resistor R34, the thirty-sixth resistor R35, and the thirty-seventh resistor R36, which are connected in sequence, are connected in parallel between the two paths on the other side of the transformer. The thirty-eighth resistor R37 and the twelfth capacitor C12, which are connected in series, have one end connected between the optocoupler U4A and the controllable precision voltage-stabilizing source U5, and the other end connected between the thirty-sixth resistor R35 and the thirty-seventh resistor R36.

2. The surge-resistant, low-ripple, expandable multi-channel DC-DC power supply according to claim 1, characterized in that: The input filter circuit unit includes a first diode D1, a first filter capacitor Cin1, a second filter capacitor Cin2, a first capacitor C1, a second capacitor C2, a first inductor L0, and a second inductor L1. The two input ends of the first inductor L0 are respectively connected to the input voltages Vin+ and Vin-, and one output end is used for outputting the voltage Vout+ through the second inductor L1, and the other output end is used for outputting the voltage Vout-. The first diode D1 and the first filter capacitor Cin1 are connected in parallel between the two input ends of the first inductor L0, and the second filter capacitor Cin2, the first capacitor C1, and the second capacitor C2 are connected in parallel between the two output ends of the first inductor L0.

3. The surge-resistant, low-ripple, expandable multi-channel DC-DC power supply according to claim 1 or 2, characterized in that: The anti-surge circuit unit includes a first chip U1, a first resistor R0 to a ninth resistor R8, a first transistor Q1, and a third capacitor C3. The first terminal of the first chip U1 is connected to the output voltage Vout+ of the input filter circuit unit through the first resistor R0 as the input voltage Vin+, and the other terminal is used to output the voltage Vout+ through the first transistor Q1. The second terminal is connected between the first resistor R0 and the input voltage Vin+. The fifth terminal is connected to the output voltage Vout- of the input filter circuit unit as the input voltage Vin-, and the other terminal is used to output the voltage Vout-. Terminal 6 is connected to the output voltage Vout- side via the third capacitor C3, terminal 7 is connected to the output voltage Vout- side via the eighth resistor R7, terminal 8 is connected to the output voltage Vout+ side via the ninth resistor R8, and terminal 9 is connected to the ninth resistor R8 side. The second resistor R1, the third resistor R2, and the fourth resistor R3 are connected in parallel between the second and fifth terminals of the first chip U1, and the fifth resistor R4, the sixth resistor R5, and the seventh resistor R6 are also connected in parallel. The third terminal of the first chip U1 is connected between the second resistor R1 and the third resistor R2, and the fourth terminal is connected between the fifth resistor R4 and the sixth resistor R5.

4. The surge-resistant, low-ripple, expandable multi-channel DC-DC power supply according to claim 3, characterized in that: The power conversion unit also includes a 27V / +12V conversion unit, a 27V / -12V conversion unit, a 27V / +6V conversion unit, a 27V / -6V conversion unit, a 27V / A5V conversion unit, and a 27V / D5V conversion unit. The 27V / +12V conversion unit, the 27V / -12V conversion unit, the 27V / +6V conversion unit, the 27V / -6V conversion unit, the 27V / A5V conversion unit, the 27V / D5V conversion unit, and the 27V / -135V conversion unit are respectively connected to the anti-surge circuit unit.

5. The surge-resistant, low-ripple, expandable multi-channel DC-DC power supply according to claim 4, characterized in that: The 27V / +12V conversion unit, the 27V / -12V conversion unit, the 27V / +6V conversion unit, the 27V / -6V conversion unit, the 27V / A5V conversion unit, and the 27V / D5V conversion unit all include a second chip U2, a third chip U3, a fourth capacitor C4 to a nineteenth capacitor C19, a tenth resistor R9 to a twenty-sixth resistor R25, a third inductor L2, a fourth inductor L3, a second transistor Q2, a second diode D2, a third diode D3, and a transformer. A first path of the transformer is connected to the fourth terminal of the second chip U2 via the second diode D2 and the twenty-first resistor R20, and a second path is connected to the output voltage Vout- of the anti-surge circuit unit as the input voltage Vin-, and The third path is connected to the output voltage Vout+ of the anti-surge circuit unit through the third inductor L2 as the input voltage Vin+, the fourth path is connected to the third diode D3 and the fourth inductor L3 as the output voltage Vout+, the fifth path is used as the output voltage Vout-, the eleventh capacitor C11 is connected in parallel between the first path and the second path, the twelfth capacitor C12 is connected in parallel between the first path and the third path, the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel between the second path and the third path, and the thirteenth capacitor C13, the fourteenth capacitor C14, the eighteenth capacitor C18, and the nineteenth capacitor C19 are connected in parallel between the fourth path and the fifth path; the first end of the second chip U2 is connected to one side of the fourth capacitor C4 through the sixth capacitor C6, and the second end is connected to the fourth capacitor C4. The 10th terminal is connected to one side of the capacitor C4 via the eighth capacitor C8, the 9th terminal is connected to one side of the fourth capacitor C4 via the thirteenth resistor R12, the 7th terminal is connected to the 8th terminal via the eleventh resistor R10, the eighth resistor R7, and the ninth resistor R8, and the other path is connected to the 8th terminal via the twelfth resistor R11 and the nineteenth resistor R18, the 6th terminal is connected between the twelfth resistor R11 and the nineteenth resistor R18, the 5th terminal is connected to the 4th terminal of the second transistor Q2 via the fourteenth resistor R13, the 8th terminal is connected to the 4th terminal of the second transistor Q2 via the seventeenth resistor R16 and the eighteenth resistor R17, and the other path is connected to the 1st, 2nd, and 3rd terminals of the second transistor Q2. Terminals 6, 7, and 8 are connected to the transformer, and the third terminal of the second chip U2 is connected to the third chip U3; the U3B side of the third chip U3 is connected in parallel with the twentieth resistor R19 and the tenth capacitor C10. The U3B side is also connected to the seventh capacitor C7 after passing through the nineteenth resistor R18 side, the tenth capacitor C10 side, the sixth terminal of the second chip U2, the thirteenth resistor R12 side, and the twelfth resistor R11 side. The U3A side is connected to the fourteenth capacitor C14 side through the twenty-second resistor R21 and the twenty-third resistor R22 connected in parallel, and is connected to the fourth inductor L3 side through the sixteenth capacitor C16, the twenty-fifth resistor R24, and the twenty-fourth resistor R23. The U3A side and the U3B side are also connected through the fifteenth capacitor C15.One side of the thirteenth resistor R12 is connected between the twelfth resistor R11 and the nineteenth resistor R18, and the fifth capacitor C5 is connected in parallel to the twelfth resistor R11.

6. The surge-resistant, low-ripple, expandable multi-channel DC-DC power supply according to claim 5, characterized in that: The output filter unit includes a +12V output filter unit, a -12V output filter unit, a +6V output filter unit, a -6V output filter unit, an A5V output filter unit, a D5V output filter unit, a -135V output filter unit, and a -135V telemetry unit. The -12V output filter unit, the +6V output filter unit, the -6V output filter unit, the A5V output filter unit, the D5V output filter unit, and the -135V output filter unit are respectively connected to corresponding power conversion units. The -135V telemetry unit is connected to a 27V / -135V conversion unit, and the +12V output filter unit, the -12V output filter unit, the +6V output filter unit, the -6V output filter unit, the A5V output filter unit, the D5V output filter unit, the -135V output filter unit, and the -135V telemetry unit are commonly grounded.

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