Power supply module starting circuit

Abstract

The utility model provides a 25V power supply module starting circuit. The 25V power supply module starting circuit comprises a DC / DC conversion unit, a suppression circuit and a switching circuit, the suppression circuit is used for suppressing overlarge surge current generated when high-voltage input is electrified, and the suppression circuit is connected to the input end of the DC / DC conversion unit; and the switching circuit is used for starting low-voltage direct current output and is connected to the output end of the DC / DC conversion unit. The suppression circuit is connected to the input end of the DC / DC conversion unit, so that higher surge current generated by a capacitor in the power supply when high-voltage input is electrified can be reduced, and elements in the power supply can be protected; the switching circuit is connected to the output end of the DC / DC conversion unit, so that the switching circuit opens an enabling pin of the DC / DC conversion unit, the power module outputs low-voltage direct current, the input starting process of the power module is completed, and the reliability problem of converting high-voltage direct current input by an external power source into a low-voltage direct current power source is solved. Therefore, the power supply module can be used in a special environment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of starting circuit, and particularly relates to a power module starting circuit. BACKGROUND

[0002] In modern electronic equipment, stable power supply and wide range voltage conversion are very important. With the development of technology, power supply is rapidly developing towards miniaturization, integration, intelligence and greenization, and the requirements of different industries and different application scenarios are more diversified.

[0003] In the field of marine application, as an important power supply module and conversion unit of shipborne equipment, the power supply not only needs to meet the high-quality electrical performance indicators, but also needs to have high reliability, wide conversion and stable work in complex environments. The power module in the prior art has problems such as not meeting the electrical performance indicators, not having a large conversion range, and insufficient electromagnetic interference suppression capability, especially in complex sea conditions such as high wind and heavy waves, high temperature and humidity, and salt spray, the operation reliability does not meet the standard.

[0004] The purpose of the present application is to provide a power module starting circuit which can solve the above problems and meet the requirements of shipborne equipment on electrical performance, conversion range, reliable operation and complex working conditions of the power module. CONTENT OF THE INVENTION

[0005] Therefore, the present application provides a power module starting circuit.

[0006] The technical scheme adopted by the present application is as follows: a power module starting circuit, comprising a DC / DC conversion unit, a suppression circuit and a switching circuit;

[0007] The suppression circuit is used to suppress excessive inrush current generated when high-voltage input is powered on, and the suppression circuit is connected to the input end of the DC / DC conversion unit.

[0008] The switching circuit is used to turn on low-voltage direct current output, and the switching circuit is connected to the output end of the DC / DC conversion unit.

[0009] Further, the suppression circuit comprises a first capacitor, a second capacitor, a first resistor, a second resistor and a power resistor.

[0010] The first capacitor and the second capacitor are connected in series, the positive electrode of the first capacitor is connected to the BC+ pin of the DC / DC conversion unit, and the negative electrode of the second capacitor is connected to the R pin of the DC / DC conversion unit.

[0011] The first resistor is connected in parallel across the first capacitor;

[0012] The second resistor is connected in parallel across the second capacitor;

[0013] One end of the power resistor is connected with a pin of the DC / DC conversion unit, and the other end of the power resistor is connected with a positive pole of the first capacitor.

[0014] Further, the switch circuit comprises a fourth resistor and a photoelectric coupler, one end of the fourth resistor is connected with an AUX pin of the DC / DC conversion unit, the other end of the fourth resistor is connected with an input end of the photoelectric coupler, the input end of the photoelectric coupler is also connected with an EN pin of the DC / DC conversion unit, and output ends of the photoelectric coupler are connected with an -IN pin and an ON / OFF pin of the DC / DC conversion unit respectively.

[0015] Further, the photoelectric coupler comprises a diode and a control integrated module, one end of the diode is connected with an EN pin of the DC / DC conversion unit, the other end of the diode is connected with the fourth resistor, one end of the control integrated module is connected with an -IN pin of the DC / DC conversion unit, and the other end of the control integrated module is connected with an ON / OFF pin of the DC / DC conversion unit.

[0016] Compared with the prior art, the application has the beneficial effects that the suppression circuit is connected with an input end of the DC / DC conversion unit, which can reduce a higher inrush current generated by a capacitor inside the power supply when high-voltage input is powered on, and can protect the elements inside the power supply; the switch circuit is connected with an output end of the DC / DC conversion unit, which makes the switch circuit open an enable pin of the DC / DC conversion unit, makes the power supply module output low-voltage direct current, completes an input starting process of the power supply module, and solves the reliability problem of converting high-voltage direct current input by an external power supply into low-voltage direct current power supply, so as to meet the use of the power supply module in special environments. BRIEF DESCRIPTION OF DRAWINGS

[0017] The following drawings only schematically illustrate and explain the application, and are not used to limit the scope of the application, in which:

[0018] Figure 1 FIG. 1 is a structural schematic diagram of a starting circuit of the application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme, design method and advantages of the application more clear and explicit, the application is further described in detail below by combining with the drawings through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.

[0020] The power supply module of the application is applied to a ship, and reference is made to Figure 1The application provides a power module starting circuit, which comprises a DC / DC conversion unit, a suppression circuit and a switch circuit; the suppression circuit is used for suppressing excessive inrush current generated when high-voltage input is powered on, and is connected to the input end of the DC / DC conversion unit; the switch circuit is used for starting low-voltage direct-current output, and is connected to the output end of the DC / DC conversion unit.

[0021] In the above, the suppression circuit comprises a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2 and a power resistor R3.

[0022] The first capacitor C1 and the second capacitor C2 are connected in series, the positive pole of the first capacitor C1 is connected to the BC+ pin of the DC / DC conversion unit, and the negative pole of the second capacitor C2 is connected to the R pin of the DC / DC conversion unit.

[0023] The first resistor R1 is connected in parallel to the two ends of the first capacitor C1.

[0024] The second resistor R2 is connected in parallel to the two ends of the second capacitor C2.

[0025] One end of the power resistor R3 is connected to the SP pin of the DC / DC conversion unit, and the other end of the power resistor R3 is connected to the positive pole of the first capacitor C1.

[0026] In the above, the power resistor R3 is selected as a 20Ω power resistor, which can ensure that the starting current is not greater than 25A.

[0027] In the above, the switch circuit comprises a fourth resistor R4 and a photoelectric coupler V1, one end of the fourth resistor R4 is connected to the AUX pin of the DC / DC conversion unit, the other end of the fourth resistor R4 is connected to the input end of the photoelectric coupler V1, the input end of the photoelectric coupler V1 is also connected to the EN pin of the DC / DC conversion unit, and the output end of the photoelectric coupler V1 is respectively connected to the -IN pin and the ON / OFF pin of the DC / DC conversion unit.

[0028] In the above, the photoelectric coupler V1 comprises a diode and a control integrated module IC, one end of the diode is connected to the EN pin of the DC / DC conversion unit, the other end of the diode is connected to the fourth resistor R4, one end of the control integrated module IC is connected to the -IN pin of the DC / DC conversion unit, and the other end of the control integrated module IC is connected to the ON / OFF pin of the DC / DC conversion unit.

[0029] When the high-voltage current is input, the power resistor R3 reduces the surge current generated in the high-voltage input moment, changes the high voltage to low voltage, charges the first capacitor C1 and the second capacitor C2 through the power resistor R3 in the suppression circuit, and discharges through the first resistor R1 and the second resistor R2, when the input current reaches the on-voltage of the optocoupler V1, the AUX pin of the DC / DC conversion unit outputs current, the current is reduced through the fourth resistor R4, and the output current is reduced to the on-current of the optocoupler V1, the optocoupler V1 is turned on, the optocoupler V1 sends a signal, thereby opening the low-voltage DC output switch, so that the power module performs low-voltage DC output, and completes the input starting process of the power module; solve the reliability problem of converting high-voltage DC input by external power supply into low-voltage DC power supply, and enable the shipborne equipment to be normally used and stably operated in special sea state environment.

[0030] The above has described the embodiments of the present application, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical applications or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A power module start-up circuit, characterized by, The DC / DC conversion unit, the suppression circuit and the switch circuit are included. The suppression circuit is used to suppress the excessive inrush current generated when the high-voltage input is powered on, and is connected to the input end of the DC / DC conversion unit. The switch circuit is used to turn on the low-voltage DC output, and is connected to the output end of the DC / DC conversion unit.

2. A power module start-up circuit according to claim 1, wherein The suppression circuit includes a first capacitor, a second capacitor, a first resistor, a second resistor and a power resistor. The first capacitor and the second capacitor are connected in series, the positive pole of the first capacitor is connected to the BC+ pin of the DC / DC conversion unit, and the negative pole of the second capacitor is connected to the R pin of the DC / DC conversion unit. The first resistor is connected in parallel across the first capacitor. The second resistor is connected in parallel across the second capacitor. One end of the power resistor is connected to the SP pin of the DC / DC conversion unit, and the other end of the power resistor is connected to the positive pole of the first capacitor.

3. A power module start-up circuit according to claim 1, wherein The switch circuit includes a fourth resistor and an optoelectronic coupler, one end of the fourth resistor is connected to the AUX pin of the DC / DC conversion unit, the other end of the fourth resistor is connected to the input end of the optoelectronic coupler, the input end of the optoelectronic coupler is also connected to the EN pin of the DC / DC conversion unit, and the output end of the optoelectronic coupler is respectively connected to the -IN pin and the ON / OFF pin of the DC / DC conversion unit.

4. A power module start-up circuit as claimed in claim 3, wherein The optoelectronic coupler includes a diode and a control integrated module, one end of the diode is connected to the EN pin of the DC / DC conversion unit, the other end of the diode is connected to the fourth resistor, one end of the control integrated module is connected to the -IN pin of the DC / DC conversion unit, and the other end of the control integrated module is connected to the ON / OFF pin of the DC / DC conversion unit.

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