Wide-range input voltage multipath independent output auxiliary power supply

Abstract

The utility model discloses a multipath independent output auxiliary power supply with wide-range input voltage, relates to the field of power supply equipment, aims to solve the problems that the output voltage is single and the whole auxiliary power supply cannot be used in case of failure in the prior art, and adopts the technical scheme that the multipath independent output auxiliary power supply comprises an input direct current module and a voltage transformation module which are connected with each other; the rear ends of the transformation modules are connected with a voltage output module, each group of transformation modules operates independently, the front end of each group of transformation modules is connected with a front-end filtering module, the rear end of each group of transformation modules is connected with a rear-end filtering module, each transformation module is further connected with a boosting module and a frequency compensation module, and the rear end of each rear-end filtering module is connected with a voltage dividing and regulating module. And a voltage output module is connected. By arranging the multiple groups of voltage transformation units which operate independently, different voltages can be output, different use requirements can be met, and when one voltage transformation unit breaks down, output of other voltage transformation units cannot be affected.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply equipment, in particular to an auxiliary power supply with multiple independent outputs and a wide range of input voltages. Background Art

[0002] In today's rapidly evolving electronics landscape, the demand for power management is growing, particularly in applications requiring wide input voltage ranges and multiple output voltages. Traditional power supply solutions are often limited to fixed input and output voltage configurations. In the event of a fault, the entire auxiliary power supply cannot stably output the desired voltage, making it difficult to adapt to changing power environments and diverse device requirements. Utility Model Content

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide an auxiliary power supply with multiple independent outputs and a wide range of input voltages, which can effectively solve the problems in the background technology.

[0004] In order to achieve the above-mentioned object, the present invention discloses an auxiliary power supply with multiple independent outputs of a wide range of input voltages. The technical solution adopted is as follows: it includes an input DC module and a transformer module, and the two are connected. The transformer module is connected to a voltage output module at the rear end. The transformer module has multiple groups, each group operates independently. The front end of each group of transformer modules is connected to a front-end filter module, and the rear end is connected to a rear-end filter module. The transformer module is also connected to a boost module and a frequency compensation module. The rear end of the rear-end filter module is connected to a voltage divider and voltage regulator module, and then connected to the voltage output module. By setting up multiple groups of independently operating transformer units, different voltages can be output to meet different usage requirements, and when one transformer unit fails, the output of other transformer units will not be affected.

[0005] As a preferred technical solution of the present invention, the front-end filter module includes three filter capacitors connected in parallel to the ground, which are two polar capacitors and one non-polar capacitor. Through the front-end filter module, a smoother DC output can be obtained.

[0006] As a preferred technical solution of the present invention, the voltage dividing and regulating module is a voltage dividing circuit, which can ensure the stability of the output voltage.

[0007] As a preferred technical solution of the present invention, the frequency compensation module is two non-polar capacitors connected in parallel, one of which is further connected in series with a resistor. This module can ensure the stability of the circuit and good transient response.

[0008] As a preferred technical solution of the present invention, there are six groups of voltage conversion modules, and their output voltages are ±12V, ±5V and ±3.3V respectively.

[0009] As a preferred technical scheme of the utility model, the voltage transformation module includes a DC-DC converter, the DC-DC converter is connected with the voltage boosting module, and the voltage boosting module is a bootstrap circuit; the RT / CLK port of the voltage boosting module is connected with a resistor and then grounded.

[0010] Compared with the prior art, the utility model has the beneficial effects that: the utility model connects the input direct current module with multiple groups of independently operated voltage transformation modules, and connects filter modules in front and behind the voltage transformation modules, so that different voltages can be outputted to meet different use requirements, and when a fault occurs in a voltage transformation circuit, the normal operation of other voltage transformation circuits is not affected.Further, connecting a voltage dividing circuit on the voltage transformation module can feed back the output voltage to the feedback pin through the voltage dividing resistor, compare the feedback voltage with the internal reference voltage to adjust the duty cycle of the driving waveform of the switch tube, and ensure the stability of the output voltage; the frequency compensation network connected with the voltage transformation module can optimize the phase margin of the system to ensure the stability and good transient response of the circuit; the bootstrap capacitor C1 provides sufficient driving voltage for the internal MOSFET to ensure that it can be fully turned on when the high side switch is on, thereby reducing the conduction loss and improving the efficiency; the rear-end filter module can filter the ripple and noise generated when the inductance releases energy to ensure the smoothness and stability of the output voltage. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 It is a structural schematic view of the utility model;

[0012] Fig. 2 It is a multi-path independent output principle view of the utility model;

[0013] Fig. 3 It is a +5V output principle view of the utility model.

[0014] In the drawing: 1, input direct current module; 2, front-end filter module; 3, voltage boosting module; 4, rear-end filter module; 5, voltage dividing and voltage regulating module; 6, voltage transformation module; 7, frequency compensation module; 8, voltage output module. DETAILED DESCRIPTION

[0015] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model. Embodiment 1

[0016] As Figs. 1-2As shown, the utility model discloses an auxiliary power supply with multiple independent outputs in a wide range of input voltages. The technical solution adopted is as follows: an input DC module 1 with an input voltage of 4.5~60V is connected to six groups of independent voltage conversion circuits, which correspond to a +12V output circuit, a -12V output circuit, a +5V output circuit, a -5V output circuit, a +3.3V output circuit and a -3.3V output circuit respectively. The six groups of independent voltage conversion circuits have the same composition and connection. The +5V output circuit is used as an example for explanation, and the other five circuits are not repeated.

[0017] like Fig. 3As shown, the variable voltage line includes a front-end filter module 2, a variable voltage module 6 and a rear-end filter module 4. The front-end filter module 2 is connected to the variable voltage module 6. The front-end filter module 2 includes three capacitors in parallel, i.e. a polar capacitor C7, a polar capacitor C8 and a non-polar capacitor C9. The front-end filter module 2 can filter out the input noise, so that the DC input is smoother. The variable voltage module 6 includes a DC-DC converter. The output line of the front-end filter module 2 is connected to the VIN (2#) port of the DC-DC converter. The RT / CLK (4#) port of the DC-DC converter is connected to the resistance R4 and then grounded. The resistance R4 can interact with the internal circuit to determine the frequency of the switch. In order to provide a gate drive voltage for the high-side MOSFET, a bootstrap circuit is also connected to the DC-DC converter. Specifically, the BOOT (1#) port and the SW (8#) port of the DC-DC converter are connected to the bootstrap capacitor C1. The bootstrap capacitor C1 can provide sufficient drive voltage for the internal MOSFET, ensuring that it is fully on when the high-side switch is on, thereby reducing the on-state loss and improving the efficiency. The line connected to the SW (8#) port of the bootstrap capacitor C1 is further connected to the output inductor L1. The output inductor L1 can release energy to the load when the MOSFET is off. The EP (9#) port of the DC-DC converter is grounded and further includes a voltage stabilizing diode D1. The front end of the voltage stabilizing diode D1 is grounded, and the rear end is connected to the line connected to the SW (8#) port of the bootstrap capacitor C1. In order to filter out the ripples and noise generated when the inductor releases energy, two grounded polar capacitors C2 and C3 are connected in parallel at the rear end of the output inductor L1. In order to adjust the output voltage, the FB (5#) port of the DC-DC converter is further connected to a voltage dividing and voltage regulating module 5, which includes a resistance R1 and a resistance R2. One end of the resistance R1 is connected to the FB (5#) port, and the other end is connected to the rear end of the output inductor L1. The connection point is located at the rear end of the connection point of the rear-end filter module 4. One end of the resistance R2 is connected to the FB (5#) port, and the other end is grounded. The output voltage is set by adjusting the ratio of the two voltage dividing resistors R1 and R2 connected to the feedback pin. The output voltage is fed back to the feedback pin through the voltage dividing resistors R1 and R2. The feedback voltage is compared with the internal reference voltage (VFB=0.8V) to adjust the duty cycle of the MOSFET drive waveform, ensuring the stability of the output voltage. The output voltage can be ±3.3V, ±5V, ±12V.

[0018] In order to optimize the phase margin of the system and ensure the stability and good transient response of the circuit, the COMP (6#) port of the DC-DC converter is connected to a frequency compensation module 7. The frequency compensation module 7 includes a capacitor C10 and a capacitor C11 connected in parallel at the COMP (6#) port. The rear ends of the two capacitors are grounded. The front end of the capacitor C11 is further connected in series with the resistance R5.

[0019] The GND (7#) port of the DC-DC converter is grounded.

[0020] The connection point between the output inductor L1 back end and the resistor R1 is connected with the voltage output module 8.

[0021] The auxiliary power supply disclosed by the embodiment can provide corresponding voltage output according to the load demand, when the load needs 3.3V, only the input voltage of the input DC module 1 is increased to more than 3.3V, the auxiliary power supply can output the voltage meeting the load demand.

[0022] Although the embodiments of the utility model have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An auxiliary power supply with multiple independent outputs and a wide range of input voltages, comprising an input DC module (1) and a transformer module (6), the two being connected, the transformer module (6) being connected to a voltage output module (8) at the rear end, characterized in that: The transformer modules (6) are provided in multiple groups, each group operating independently. The front end of each transformer module (6) is connected to a front-end filter module (2), and the rear end is connected to a rear-end filter module (4). The transformer modules (6) are also connected to a boost module (3) and a frequency compensation module (7). The rear end of the rear-end filter module (4) is connected to a voltage divider and voltage regulator module (5), and then to the voltage output module (8).

2. The auxiliary power supply with multiple independent outputs and a wide input voltage range according to claim 1, characterized in that: The front-end filter module (2) comprises three filter capacitors connected in parallel to the ground, which are two polar capacitors and one non-polar capacitor.

3. The auxiliary power supply with multiple independent outputs and a wide input voltage range according to claim 1, characterized in that: The back-end filter module (4) is two polar capacitors connected in parallel to the ground.

4. The auxiliary power supply with multiple independent outputs and a wide input voltage range according to claim 1, characterized in that: The voltage dividing and regulating module (5) is a voltage dividing circuit.

5. The auxiliary power supply with multiple independent outputs and a wide input voltage range according to claim 1, characterized in that: The frequency compensation module (7) is two non-polar capacitors connected in parallel, and one of the non-polar capacitors is also connected in series with a resistor.

6. The auxiliary power supply with multiple independent outputs and a wide input voltage range according to claim 5, characterized in that: There are six groups of voltage conversion modules (6), and their output voltages are respectively ±12V, ±5V and ±3.3V.

7. The auxiliary power supply with multiple independent outputs and a wide input voltage range according to claim 6, characterized in that: The voltage conversion module (6) includes a DC-DC converter, the DC-DC converter is connected to the boost module (3), and the boost module (3) is a bootstrap circuit; its RT / CLK port is connected to a resistor and then grounded.

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