CN210041327U - Multi-power supply circuit and power supply device - Google Patents
Multi-power supply circuit and power supply device Download PDFInfo
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- CN210041327U CN210041327U CN201921154947.2U CN201921154947U CN210041327U CN 210041327 U CN210041327 U CN 210041327U CN 201921154947 U CN201921154947 U CN 201921154947U CN 210041327 U CN210041327 U CN 210041327U
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Abstract
The utility model provides a multichannel power supply circuit and power supply unit, multichannel power supply circuit includes POE power, 24V AC adapter power, 12V DC adapter power, rectifier module and DC-DC conversion module, rectifier module's input termination 24V AC adapter power, DC-DC conversion module's input connects rectifier module's output and POE power simultaneously, that is to say 24V AC adapter power combines the input that inserts DC-DC conversion module with POE power after the rectification, in addition, 12V DC adapter power connects DC-DC conversion module's output; the input voltage interval of the DC-DC conversion module is 24-57V due to the circuit design, when 12V direct current is output externally, the problem of boosting of low voltage (such as 9V) in the input voltage interval 9-57V of the traditional three-way power supply combination is not needed to be considered, and the problem of low efficiency when the low voltage is input does not exist.
Description
Technical Field
The utility model relates to a control technology field especially relates to a multichannel power supply circuit and power supply unit.
Background
Adapter power supply refers to utilizing a power adapter to supply power to a device. POE (Power Over Ethernet, Ethernet) Power supply refers to a technology that can provide dc Power supply for some IP-based terminals (such as IP phones, wireless lan access points AP, network cameras, etc.) while transmitting data signals for such devices without any change to the existing Ethernet cat.5 wiring infrastructure. The POE power supply is power supply through ethernet, and this way, only through that network cable connecting the communication terminals, can accomplish their power supply. The POE system includes a PSE (Power Sourcing Equipment) and a PD (Power Device), both of which establish information association on connection condition, Device type, Power consumption level, and the like of the PD based on the ieee802.3af standard, and supply Power to the PD through the ethernet according to the PSE. The POE system provides typical 48V direct current, and the maximum power supply distance can reach 100 m.
At present, many application occasions need to support POE power supply (44-57V direct current, generally 48V direct current) and 24V alternating current adapter power supply or 12V direct current adapter power supply simultaneously. In the prior art, three power supplies are respectively converted into low levels, and output voltages generated by the conversion of the three power supplies are combined, but the efficiency is low; meanwhile, in practical application, a power supply is selected for supplying power in a plurality of scenes, if a 12V direct current adapter power supply is selected for supplying power independently, the lowest input voltage is 9V, a DC-DC conversion module (flyback) needs to be boosted to 12V under the condition that the input voltage has deviation of +/-25%, the stress of a secondary side diode is very high, and the design difficulty and the circuit cost are increased.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a novel multi-channel power supply technology for solving the above-mentioned technical problems.
In order to achieve the above and other related objects, the present invention provides a multi-path power supply circuit, which includes a POE power supply, a 24V ac adapter power supply, a 12V DC adapter power supply, a rectifier module, and a DC-DC conversion module;
the input end of the rectification module is connected with the 24V alternating current adapter power supply, and the output end of the rectification module is connected with the input end of the DC-DC conversion module; meanwhile, the POE power supply is connected with the input end of the DC-DC conversion module, and the 12V direct current adapter power supply is connected with the output end of the DC-DC conversion module;
the output end of the DC-DC conversion module is the output end of the multi-path power supply circuit.
Optionally, the power supply circuit further includes a first diode, an anode of the first diode is connected to the positive output end of the rectifier module, and a cathode of the first diode is connected to the positive output end of the POE power supply.
Optionally, the power supply circuit further includes a second diode, an anode of the second diode is connected to the positive output end of the 12V DC adapter power supply, and a cathode of the second diode is connected to the positive output end of the DC-DC conversion module.
Optionally, the rectification module comprises a thyristor rectifier.
Optionally, the DC-DC conversion module comprises a wide voltage DC-DC converter.
Optionally, the DC-DC conversion module comprises a buck chopper.
Optionally, the DC-DC conversion module comprises a flyback DC-DC converter.
Optionally, the flyback DC-DC converter includes a power management unit and a voltage-decreasing and voltage-stabilizing unit, an input end of the power management unit is connected to the output end of the rectifier module and the POE power supply, respectively, and an output end of the power management unit is connected to an input end of the voltage-decreasing and voltage-stabilizing unit.
In addition, in order to achieve the above objects and other related objects, the present invention also provides a power supply device, including the multi-channel power supply circuit of any one of the above objects.
As described above, the utility model discloses a multichannel power supply circuit has following beneficial effect:
because the input end of the rectification module is connected with the power supply of the 24V alternating current adapter, the input end of the DC-DC conversion module is simultaneously connected with the output end of the rectification module and the POE power supply, namely the 24V alternating current adapter power supply is rectified and then combined with the POE power supply to be connected with the input end of the DC-DC conversion module, and in addition, the 12V direct current adapter power supply is connected with the output end of the DC-DC conversion module; the input voltage interval of the DC-DC conversion module is 24-57V, the problem of boosting of low voltage (such as 9V) in the input voltage interval of 9-57V of the traditional three-way power supply combination is not needed to be considered, the flyback design difficulty of the DC-DC conversion module is low, a secondary diode of the DC-DC conversion module does not need to be high in Vds withstand voltage, the problem of low efficiency when low voltage is input is avoided, and the cost of the circuit is low.
Drawings
Fig. 1 is a schematic diagram of a multi-path power supply circuit in an embodiment of the present invention.
Description of the element reference numerals
D1 first diode
D2 second diode
Detailed Description
As mentioned in the background art, the conventional electronic product usually needs multiple power supplies such as a POE power supply, a 24V ac adapter power supply, and a 12V dc adapter power supply, and the conventional multiple power supply technology mostly switches the POE power supply, the 24V ac adapter power supply, and the 12V dc adapter power supply into a low voltage (e.g. 12V) by shunting and then switching the paths, so that the circuit structure is relatively complex and the conversion efficiency of the circuit is not high. Especially, when the 12V DC adapter power supply is independently selected to output 12V DC voltage, the lowest input voltage is 9V under the condition that the input voltage has +/-25% deviation, the DC-DC conversion module (flyback) needs to be boosted to 12V, the stress of a secondary side diode is very high, and the design difficulty and the circuit cost are increased.
Based on this, the utility model provides a new multichannel power supply circuit closes the input that inserts DC-DC conversion module with the POE power after the rectification of 24V alternating current adapter power, and simultaneously, 12V direct current adapter power connects the output of DC-DC conversion module, and the output of DC-DC conversion module is promptly multichannel power supply circuit's output.
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve.
As shown in fig. 1, an embodiment of the present invention provides a multi-path power supply circuit, which includes a POE power supply, a 24V AC adapter power supply (AC 24V), a 12V DC adapter power supply (DC 12V), a rectifier module, and a DC-DC conversion module; the input end of the rectification module is connected with a 24V alternating current adapter power supply, and the output end of the rectification module is connected with the input end of the DC-DC conversion module; meanwhile, a POE power supply is connected with the input end of the DC-DC conversion module, and a 12V direct current adapter power supply is connected with the output end of the DC-DC conversion module; and the output end of the DC-DC conversion module is the output end of the multi-path power supply circuit.
According to the above, the 24V ac adapter power supply is rectified by the rectification module and then connected to the input terminal of the DC-DC conversion module, the POE power supply is connected to the input terminal of the DC-DC conversion module, that is, the 24V ac adapter power supply is rectified and then combined with the POE power supply to be connected to the input terminal of the DC-DC conversion module, and meanwhile, the 12V DC adapter power supply is connected to the output terminal of the DC-DC conversion module; the input voltage interval of the DC-DC conversion module is 24-57V, and the lower limit value of the input voltage is obviously greater than the rated output of 12V, so that the multi-path power supply circuit does not have the problem of low-voltage boosting in the input voltage interval of 9-57V of the traditional three-path power supply combined power supply circuit, and does not have the problem of low efficiency when low voltage is input, a secondary diode of the DC-DC conversion module does not need to select high Vds withstand voltage, the flyback design difficulty of the DC-DC conversion module is low, and the cost of the circuit is low.
Even when the 12V dc adapter power supply alone supplies power, the output voltage is considered to have a voltage deviation of 25%, that is, 9V at the lowest, as follows:
1) no chip or other devices in the circuit use 12V direct current, the 12V direct current is used as an intermediate voltage and mainly used for reducing the voltage into other low-voltage power supplies, and the lowest voltage 9V does not influence the low-voltage conversion function of the rear-stage Buck;
2) and a chip VDD in the circuit is used for 12V direct current, but the lowest voltage of 9V reaches the working voltage of the chip, so that the normal function of the circuit is not influenced.
Therefore, the multi-path power supply circuit completely meets the power consumption requirements in various application scenes, the problem of low-voltage boosting in an input voltage interval of the traditional three-path power supply combined power supply circuit does not exist, the problem of low efficiency when the input voltage is low does not exist, a secondary side diode of the DC-DC conversion module does not need to be high in Vds withstand voltage, the flyback design difficulty of the DC-DC conversion module is low, and the cost of the circuit is low.
In detail, as shown in fig. 1, the power supply circuit further includes a first diode D1, an anode of the first diode D1 is connected to the positive output terminal of the rectifier module, and a cathode of the first diode D1 is connected to the positive output terminal of the POE power supply. The arrangement of the first diode D1 can effectively prevent the high output voltage of the POE power supply from flowing backward to the rectifier module and the 24V ac adapter power supply.
In detail, as shown in fig. 1, the power supply circuit further includes a second diode D2, an anode of the second diode D2 is connected to the positive output terminal of the 12V DC adapter power supply, and a cathode of the second diode D2 is connected to the positive output terminal of the DC-DC conversion module. The arrangement of the second diode D2 can effectively prevent the high output voltage of the DC-DC conversion module from flowing backward to the 12V DC adapter power supply.
In detail, as shown in fig. 1, the output of the 24V ac adapter power supply is rectified by the rectifier module to obtain a direct current of about 24V. Wherein, the rectifier module includes but not limited to: common diode rectifiers and thyristor rectifiers with controllable parameters can be flexibly selected according to actual requirements and design cost. The specific structure of the rectifier module can refer to the prior art, and is not described herein again.
In detail, as shown in fig. 1, the output of the 24V ac adapter power supply is rectified by the rectification module and then combined with the output of the POE power supply, and the combined output is connected to the DC-DC conversion module. The DC-DC conversion module comprises a step-down chopper, and the step-down chopper is used for carrying out step-down processing on 24-57V input voltage to obtain output voltage of about 12V.
Optionally, the DC-DC conversion module comprises a wide-voltage DC-DC converter which can effectively convert and reduce the voltage in the input voltage interval (24-57V). For example, the DC-DC conversion module includes a common flyback DC-DC converter, which can effectively perform buck conversion on input voltage in a large range, and has a simple structure, high conversion efficiency, and low cost.
In detail, the flyback DC-DC converter includes a power management unit and a voltage-reducing and voltage-stabilizing unit, an input end of the power management unit is respectively connected to an output end of the rectification module and the POE power supply, the power management unit performs switching control on the 24V direct current output by the rectification module and the 48V direct current output by the POE power supply, one path of output is selected, and an output end of the power management unit is connected to an input end of the voltage-reducing and voltage-stabilizing unit; the voltage reducing and stabilizing unit is used for reducing and stabilizing the voltage of the input direct current, the output end of the voltage reducing and stabilizing unit obtains the direct current of about 12V, and the output end of the voltage reducing and stabilizing unit is the output end of the flyback DC-DC converter.
For the detailed structure of the power management unit and the buck-boost unit, reference may be made to the prior art, and many power management chips capable of simultaneously implementing switching management and buck conversion of multiple power supplies are available, for example, commonly used power management chips HIP6301, IS6537, RT9237, ADP3168, KA7500, TL494, and the like, and details thereof are not described herein again.
In more detail, when the POE power supply and the 24V ac adapter power supply simultaneously supply power, the power management unit preferentially selects the 24V ac adapter power supply to supply power to the following voltage stabilizing and reducing unit by presetting; when only one power supply (POE power supply or 24V AC adapter power supply) supplies power, the power supply directly outputs the voltage stabilizing and reducing unit without selecting switching; likewise, no switching is selected when neither is powered.
With reference to fig. 1, the operation of the multi-channel power supply circuit is analyzed as follows:
1) when the POE power supply (or the 24V alternating current adapter power supply) supplies power independently, the direct current voltage (or the direct current voltage rectified by the 24V alternating current adapter power supply) provided by the POE power supply is reduced into 12V direct current through the DC-DC conversion module to be output;
2) when the 12V direct current adapter power supply supplies power independently, the output 12V direct current is directly provided by the 12V direct current adapter power supply;
3) when the two paths of the POE power supply and the 24V alternating current adapter power supply power simultaneously, one of the two paths is selected according to actual needs, in the embodiment of the utility model, the priority of the 24V alternating current adapter power supply is higher, the 24V alternating current adapter power supply is selected to supply power and output externally, and the direct current voltage rectified by the 24V alternating current adapter power supply is reduced into 12V direct current through the DC-DC conversion module to output;
4) when the POE power supply (or the 24V alternating current adapter power supply) and the 12V direct current adapter power supply power simultaneously, if the output voltage of the DC-DC conversion module is less than or equal to VDC12V-VD2, the 12V direct current adapter power supply supplies power to the actual output; if the output voltage of the DC-DC conversion module is greater than VDC12V-VD2, the actual output is powered by a POE power supply (or a 24V alternating current adapter power supply);
5) when the POE power supply, the 24V alternating current adapter power supply and the 12V direct current adapter power supply simultaneously supply power, finally, the output is actually supplied by the 24V alternating current adapter power supply and the 12V direct current adapter power supply simultaneously, if the output voltage of the DC-DC conversion module is less than or equal to VDC12V-VD2, the actual output is supplied by the 12V direct current adapter power supply, and if the output voltage of the DC-DC conversion module is more than VDC12V-VD2, the actual output is supplied by the 24V alternating current adapter power supply.
Where VDC12V represents the actual output voltage of the 12V dc adapter power supply and VD2 represents the forward voltage drop of the second diode D2.
Furthermore, the utility model provides a power supply unit, power supply unit includes multichannel power supply circuit, power supply unit passes through multichannel power supply circuit can simply provide 12V's direct current for loads such as electronic product under the various applied scene high-efficiently, correspondingly, power supply unit's the design degree of difficulty and cost are lower. The specific structure of the power supply device can refer to the prior art, and is not described herein again.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A multi-power supply circuit is characterized by comprising a POE power supply, a 24V alternating current adapter power supply, a 12V direct current adapter power supply, a rectification module and a DC-DC conversion module;
the input end of the rectification module is connected with the 24V alternating current adapter power supply, and the output end of the rectification module is connected with the input end of the DC-DC conversion module; meanwhile, the POE power supply is connected with the input end of the DC-DC conversion module, and the 12V direct current adapter power supply is connected with the output end of the DC-DC conversion module;
the output end of the DC-DC conversion module is the output end of the multi-path power supply circuit.
2. The multi-channel power supply circuit of claim 1, further comprising a first diode, wherein an anode of the first diode is connected to the positive output terminal of the rectifier module, and a cathode of the first diode is connected to the positive output terminal of the POE power source.
3. The multi-channel power supply circuit as claimed in claim 1 or 2, further comprising a second diode, wherein an anode of the second diode is connected to the positive output terminal of the 12V DC adapter power supply, and a cathode of the second diode is connected to the positive output terminal of the DC-DC conversion module.
4. The multiple power supply circuit of claim 1, wherein said rectifier module comprises a thyristor rectifier.
5. The multi-channel power supply circuit of claim 1, wherein the DC-DC conversion module comprises a wide voltage DC-DC converter.
6. The multi-power supply circuit according to claim 1 or 5, wherein the DC-DC conversion module comprises a buck chopper.
7. The multi-channel power supply circuit of claim 1, wherein the DC-DC conversion module comprises a flyback DC-DC converter.
8. The multi-channel power supply circuit of claim 7, wherein the flyback DC-DC converter comprises a power management unit and a buck regulator unit, an input terminal of the power management unit is respectively connected to the output terminal of the rectifier module and the POE power supply, and an output terminal of the power management unit is connected to an input terminal of the buck regulator unit.
9. A power supply apparatus comprising a multiple power supply circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921154947.2U CN210041327U (en) | 2019-07-22 | 2019-07-22 | Multi-power supply circuit and power supply device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921154947.2U CN210041327U (en) | 2019-07-22 | 2019-07-22 | Multi-power supply circuit and power supply device |
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| Publication Number | Publication Date |
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| CN210041327U true CN210041327U (en) | 2020-02-07 |
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| CN201921154947.2U Active CN210041327U (en) | 2019-07-22 | 2019-07-22 | Multi-power supply circuit and power supply device |
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| CN (1) | CN210041327U (en) |
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- 2019-07-22 CN CN201921154947.2U patent/CN210041327U/en active Active
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