CN213125848U - Voltage conversion circuit with current limiting function, power supply equipment and aircraft - Google Patents
Voltage conversion circuit with current limiting function, power supply equipment and aircraft Download PDFInfo
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- CN213125848U CN213125848U CN202022161755.3U CN202022161755U CN213125848U CN 213125848 U CN213125848 U CN 213125848U CN 202022161755 U CN202022161755 U CN 202022161755U CN 213125848 U CN213125848 U CN 213125848U
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Abstract
The utility model discloses a voltage transformation circuit with current-limiting function, power supply equipment and aircraft, the circuit includes current-limiting protection unit, its first end is connected with power supply end electricity, its second end is connected with the input electricity of voltage transformation chip, current-limiting protection unit includes parallel connection's first current-limiting resistance and second current-limiting resistance; the output end of the voltage conversion chip is electrically connected with the electric load, a first node is arranged between the voltage conversion chip and the current-limiting protection unit, and a second node is arranged between the voltage conversion chip and the electric load; the first end of the first filtering unit is electrically connected with the first node, the second end of the first filtering unit is grounded, and the first filtering unit is used for filtering the voltage of the input end; and the first end of the second filtering unit is electrically connected with the second node, the second end of the second filtering unit is grounded, and the second filtering unit is used for filtering the voltage of the output end. The utility model discloses a parallelly connected current-limiting resistor reduces impulse current, avoids impulse current to destroy the component, improves the reliability, improves output voltage stability.
Description
Technical Field
The utility model relates to a voltage transformation technical field especially relates to a voltage transformation circuit, power equipment and aircraft with current-limiting function.
Background
The Near space (Near space) is an airspace 20-100 kilometers away from the ground, is located in key areas above a typhoon, a rainstorm and other disastrous weather systems, and has great development potential in the Near space area by adopting an aircraft to carry out targeted target observation on meteorological indexes along with the development of communication technology and space flight technology.
At present, a control system of an aircraft used in the field of meteorological monitoring has a large number of low-voltage power loads with specific rated voltage, and the existing aircraft mainly outputs specific voltage through a low-dropout linear regulator to realize load power supply.
SUMMERY OF THE UTILITY MODEL
The utility model provides a voltage transformation circuit with current-limiting function has solved the problem that impulse current influences product life in the power, is favorable to restraining impulse current.
In a first aspect, an embodiment of the present invention provides a voltage converting circuit with a current limiting function, including: the current-limiting protection circuit comprises a voltage conversion chip, a first filtering unit, a second filtering unit and a current-limiting protection unit, wherein the first end of the current-limiting protection unit is electrically connected with the power supply end of a power supply, the second end of the current-limiting protection unit is electrically connected with the input end of the voltage conversion chip, and the current-limiting protection unit comprises a first current-limiting resistor and a second current-limiting resistor which are connected in parallel; the output end of the voltage conversion chip is electrically connected with an electric load, a first node is arranged between the voltage conversion chip and the current-limiting protection unit, a second node is arranged between the voltage conversion chip and the electric load, and the voltage conversion chip is used for converting a first voltage provided by the power supply end of the power supply into a second voltage; the first end of the first filtering unit is electrically connected with the first node, the second end of the first filtering unit is grounded, and the first filtering unit is used for filtering the voltage of the input end of the voltage conversion chip; and the first end of the second filtering unit is electrically connected with the second node, the second end of the second filtering unit is grounded, and the second filtering unit is used for filtering the voltage at the output end of the voltage conversion chip.
Optionally, the voltage conversion chip includes an MSK5101 power chip, and the MSK5101 power chip is configured to convert a +5V dc voltage into a +1.8V dc voltage.
Optionally, the voltage conversion chip is provided with an enable pin EN and an output voltage regulation pin FB, wherein the enable pin EN is electrically connected to the current limiting protection unit through a pull-up resistor, and the output voltage regulation pin FB is electrically connected to the voltage division circuit; the voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor which are connected in series, a first end of the first voltage dividing resistor is electrically connected with a first end of the second filtering unit, a second end of the first voltage dividing resistor is electrically connected with a first end of the second voltage dividing resistor, a second end of the second voltage dividing resistor is grounded, a third node is arranged between the first voltage dividing resistor and the second voltage dividing resistor, and the output voltage regulating pin FB is electrically connected with the third node.
Optionally, the first filtering unit includes a first capacitor, a second capacitor, and a first filtering branch circuit connected in parallel, and the first filtering branch circuit includes a third capacitor and a fourth capacitor connected in series.
Optionally, the first capacitor and the second capacitor are patch capacitors, and the third capacitor and the fourth capacitor are electrolytic capacitors.
Optionally, the second filtering unit includes a fifth capacitor and a second filtering branch connected in parallel, and the second filtering branch includes a sixth capacitor and a seventh capacitor connected in series.
Optionally, the fifth capacitor is a patch capacitor, and the sixth capacitor and the seventh capacitor are electrolytic capacitors.
Optionally, the voltage converting circuit with a current limiting function further includes: the surge suppression circuit comprises a first fuse and a standby branch circuit connected with the first fuse in parallel, the standby branch circuit comprises a second fuse and a shunt resistor assembly which are connected in series, and the ratio of the resistance value of the first fuse to the resistance value of the standby branch circuit is smaller than 1: 2.
In a second aspect, the embodiment of the present invention further provides a power supply device, which includes the above voltage converting circuit with current limiting function.
In a third aspect, the embodiment of the present invention further provides an aircraft, including the above power supply device.
The embodiment of the utility model provides a voltage transformation circuit, power supply unit and aircraft with current-limiting function, this voltage transformation circuit set up voltage transformation chip, first filtering unit, second filtering unit and current-limiting protection unit, and current-limiting protection unit includes parallel connection's first current-limiting resistance and second current-limiting resistance, adopts first filtering unit to carry out filtering processing to the input voltage of voltage transformation chip; the second filtering unit is adopted to filter the voltage at the output end of the voltage conversion chip, the impact current is reduced through the parallel current-limiting resistor, the problem that the impact current in a power supply influences the service life of a product is solved, the reliability is improved, the input and output voltages are filtered through the two-stage filtering unit, the stability of the output voltage is improved, and the power supply quality of a load is improved.
Drawings
Fig. 1 is a schematic structural diagram of a voltage converting circuit with a current limiting function according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of another voltage converting circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power supply device according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of an aircraft provided by a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of a voltage conversion circuit with a current limiting function according to an embodiment of the present invention, which is applicable to an application scenario for supplying power to a low-voltage dc power load in an aircraft.
As shown in fig. 1, the voltage conversion circuit 1 with a current limiting function includes: the current-limiting protection circuit comprises a voltage conversion chip 10, a first filtering unit 20, a second filtering unit 30 and a current-limiting protection unit 40, wherein a first end of the current-limiting protection unit 40 is electrically connected with a power supply end, a second end of the current-limiting protection unit 40 is electrically connected with input ends (including a first input end VINA and a second input end VINB) of the voltage conversion chip 10, and the current-limiting protection unit 40 comprises a first current-limiting resistor R10 and a second current-limiting resistor R20 which are connected in parallel; the output end (including the first output end VOUTA and the second output end VOUTB) of the voltage conversion chip 10 is electrically connected with the electric load, a first node is arranged between the voltage conversion chip 10 and the current-limiting protection unit 40, a second node is arranged between the voltage conversion chip 10 and the electric load, and the voltage conversion chip 10 is used for converting the first voltage provided by the power supply end into a second voltage; a first end of the first filtering unit 20 is electrically connected to the first node, a second end of the first filtering unit 20 is grounded, and the first filtering unit 20 is configured to filter the voltage at the input end of the voltage converting chip 10; a first end of the second filtering unit 30 is electrically connected to the second node, a second end of the second filtering unit 30 is grounded, and the second filtering unit 30 is configured to filter the voltage at the output end of the voltage converting chip 10.
In this embodiment, the power supply terminal may be an output terminal of a dc power supply or an output terminal of a previous stage dc voltage converter, and the power supply terminal is configured to provide a dc power supply voltage, where a voltage value of the dc power supply voltage is equal to the first voltage.
In this embodiment, the first current limiting resistor R10 and the second current limiting resistor R20 may adopt power resistors of the same specification and model, the current tolerance and the rated voltage of the first current limiting resistor R10 and the second current limiting resistor R20 may be calculated by using specific parameters of a voltage converting circuit, and the first current limiting resistor R10 and the second current limiting resistor R20 are redundant to each other, which is beneficial to improving the system reliability.
Illustratively, the first current limiting resistor R10 and the second current limiting resistor R20 can adopt a power resistor with the model number of RX21-2W-8R, the resistance value of the first current limiting resistor R10 and the resistance value of the second current limiting resistor R20 are 8 ohms, and the current value of the output current of the voltage conversion circuit does not exceed the first voltage/4, so that the reduction of the impact current is realized.
Optionally, a zero-ohm resistor may be set between the output end (including the first output end VOUTA and the second output end VOUTB) of the voltage conversion chip 10 and the power consumption load, in the test phase, the zero-ohm resistor is not welded, it is ensured that the output end (including the first output end VOUTA and the second output end VOUTB) of the voltage conversion chip 10 is disconnected from the power consumption load at the rear end, the output end voltage of the voltage conversion chip 10 is tested to be correct, the zero-ohm resistor is welded to realize the electrical connection between the output end (including the first output end VOUTA and the second output end VOUTB) of the voltage conversion chip 10 and the power consumption load, the circuit performance is not affected, and the test operation is simplified.
Specifically, at the moment of power-on, the output current of the circuit is limited to be within 0.7A by the first current-limiting resistor R10 and the second current-limiting resistor R20 connected in parallel, the first filtering unit 20 filters the dc supply voltage provided by the power supply end of the power supply and outputs the processed dc supply voltage to the voltage conversion chip 10, the voltage conversion chip 10 converts the first voltage into the second voltage, the output filtering processing is performed by the second filtering unit 30, and the processed output end voltage is transmitted to the electric load in the circuit, and the rated working voltage of the electric load is equal to the second voltage.
The embodiment of the utility model provides a voltage transformation circuit with current-limiting function sets up voltage transformation chip, first filtering unit, second filtering unit and current-limiting protection unit, and the current-limiting protection unit includes parallel connection's first current-limiting resistance and second current-limiting resistance, adopts first filtering unit to carry out filtering processing to the input voltage of voltage transformation chip; the second filtering unit is adopted to filter the voltage at the output end of the voltage conversion chip, the impact current is reduced through the parallel current-limiting resistor, the problem that the impact current in a power supply influences the service life of a product is solved, the reliability is improved, the input and output voltages are filtered through the two-stage filtering unit, the stability of the output voltage is improved, and the power supply quality of a load is improved.
Optionally, the voltage conversion chip 10 includes an MSK5101 power chip, the MSK5101 power chip is configured to convert a +5V dc voltage into a +1.8V dc voltage, a maximum output current of the MSK5101 power chip is 1.5A, and a minimum voltage difference of the MSK5101 power chip is 350 mv.
Alternatively, referring to fig. 1, the voltage conversion chip 10 is provided with an enable pin EN and an output voltage regulation pin FB, wherein the enable pin EN is electrically connected to the current limiting protection unit 40 through a pull-up resistor R30, and the output voltage regulation pin FB is electrically connected to the voltage dividing circuit 110; the voltage divider circuit 110 includes a first voltage dividing resistor R40 and a second voltage dividing resistor R50 connected in series, a first end of the first voltage dividing resistor R40 is electrically connected to a first end of the second filter unit 30, a second end of the first voltage dividing resistor R40 is electrically connected to a first end of the second voltage dividing resistor R50, a second end of the second voltage dividing resistor R50 is grounded, a third node is provided between the first voltage dividing resistor R40 and the second voltage dividing resistor R50, and the output voltage regulation pin FB is electrically connected to the third node.
The enable pin EN is connected to a power supply end through a pull-up resistor R30, and the voltage conversion chip 10 starts to work immediately after the system is powered on; the output voltage regulation pin FB is electrically connected to a third node between the first voltage-dividing resistor R40 and the second voltage-dividing resistor R50, and regulates the output voltage of the voltage conversion chip 10 by feeding back the monitored voltage.
It should be noted that the voltage conversion chip 10 is further provided with other functional pins, and those skilled in the art can determine the types and specifications of components connected to the other functional pins in the MSK5101 power supply chip by calculating circuit parameters and referring to an MSK5101 power supply chip instruction manual, which is not described herein again.
Optionally, with continued reference to fig. 1, the first filtering unit 20 includes a first capacitor C1, a second capacitor C2 and a first filtering branch 210 connected in parallel, and the first filtering branch 210 includes a third capacitor C3 and a fourth capacitor C4 connected in series.
Optionally, the first capacitor C1 and the second capacitor C2 are patch capacitors, the third capacitor C3 and the fourth capacitor C4 are electrolytic capacitors, and withstand voltages of the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are all greater than a first voltage provided by the power supply terminal of the power supply.
For example, the capacitance value of the first capacitor C1 may be equal to 0.1uF, the capacitance value of the second capacitor C2 may be equal to 0.01uF, the capacitance value of the third capacitor C3 may be equal to 22uF, and the capacitance value of the fourth capacitor C3 may be equal to 22 uF.
Optionally, with continued reference to fig. 1, the second filtering unit 30 includes a fifth capacitor C5 and a second filtering branch 310 connected in parallel, and the second filtering branch 310 includes a sixth capacitor C6 and a seventh capacitor C7 connected in series.
Optionally, the fifth capacitor C5 is a patch capacitor, the sixth capacitor C6 and the seventh capacitor C7 are electrolytic capacitors, and the withstand voltages of the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 are all greater than the second voltage output by the voltage conversion chip 10.
For example, the capacitance value of the fifth capacitor C5 may be equal to 0.1uF, the capacitance value of the sixth capacitor C6 may be equal to 22uF, and the capacitance value of the seventh capacitor C7 may be equal to 22 uF.
It should be noted that, the specific capacitance value of each capacitor can be adjusted according to the voltage values of the input end voltage and the output end voltage of the voltage conversion chip 10, which is not limited herein.
In this embodiment, by connecting a plurality of capacitors having different capacitance values in parallel, signal noise of different frequency bands can be filtered, and the filtering effect of the filtering unit can be improved.
Fig. 2 is a schematic structural diagram of another voltage converting circuit according to an embodiment of the present invention.
Alternatively, referring to fig. 2, the voltage converting circuit 1 with a current limiting function further includes: the input end of the surge suppression circuit 50 is electrically connected with the power supply end of the power supply, the output end of the surge suppression circuit 50 is electrically connected with the first end of the current limiting protection unit 40, the surge suppression circuit 50 comprises a first fuse F1 and a standby branch circuit connected with the first fuse F1 in parallel, the standby branch circuit comprises a second fuse F2 and a shunt resistor R which are connected in series, and the ratio value between the resistance value of the first fuse F1 and the resistance value of the standby branch circuit is smaller than 1: 2.
The first fuse F1 and the second fuse F2 can adopt fuse wires with the same model and specification, the front end of the second fuse F2 is connected in series with a shunt resistor R to form an unbalanced parallel structure, when the voltage conversion circuit is normally used, current mainly passes through the first fuse F1, if the input current of a power supply is overlarge due to misoperation, the first fuse F1 is heated and disconnected, a standby branch is connected into the circuit, and power is normally supplied to a power load at the rear end of the circuit; if the circuit current is too large due to the short-circuit fault of the electric load at the rear end of the circuit, the first fuse F1 and the standby branch circuit are both heated and disconnected, the system reliability is improved, and the load shutdown fault rate caused by misoperation is reduced.
Optionally, the first fuse F1 has a first resistance value R1, the shunt resistor R has a second resistance value R2, and the first resistance value R1 and the second resistance value R2 satisfy: r2 > 10 × R1.
In this embodiment, when the voltage converting circuit is normally used, the resistances of the first fuse F1 and the second fuse F2 are in the milliohm range, and the resistance value of the shunt resistor R can be set to be 0.5 ohm, so as to ensure that the shunt ratio between the first fuse F1 and the spare branch exceeds 95%: 5%, it is beneficial to improving the system reliability.
Example two
Fig. 3 is a schematic structural diagram of a power supply device according to an embodiment of the present invention. Referring to fig. 3, the power supply apparatus 100 includes the voltage conversion circuit 1 having the current limiting function described above.
In this embodiment, the power supply device 100 may further include another voltage converting circuit connected in parallel or in series with the voltage converting circuit 1 having the current limiting function, so as to achieve the purpose of adapting to the electrical loads with different rated operating voltages.
Therefore, the embodiment of the utility model provides a power supply equipment sets up the voltage transformation circuit who has the current-limiting function, and this voltage transformation circuit sets up voltage transformation chip, first filtering unit, second filtering unit and current-limiting protection unit, and current-limiting protection unit includes parallel connection's first current-limiting resistance and second current-limiting resistance, adopts first filtering unit to carry out filtering processing to the input voltage of voltage transformation chip; the second filtering unit is adopted to filter the voltage at the output end of the voltage conversion chip, the impact current is reduced through the parallel current-limiting resistor, the problem that the impact current in a power supply influences the service life of a product is solved, the reliability is improved, the input and output voltages are filtered through the two-stage filtering unit, the stability of the output voltage is improved, and the power supply quality of a load is improved.
EXAMPLE III
Fig. 4 is a schematic structural diagram of an aircraft provided by a third embodiment of the present invention. Referring to fig. 4, the aircraft 200 includes the power supply apparatus 100 described above.
In this embodiment, the aircraft 200 includes any one of an airship and an unmanned aerial vehicle.
To sum up, the embodiment of the present invention provides an aircraft, which is provided with a voltage converting circuit with a current limiting function, wherein the voltage converting circuit is provided with a voltage converting chip, a first filtering unit, a second filtering unit and a current limiting protection unit, the current limiting protection unit comprises a first current limiting resistor and a second current limiting resistor which are connected in parallel, and the first filtering unit is adopted to filter the input end voltage of the voltage converting chip; the second filtering unit is adopted to filter the voltage at the output end of the voltage conversion chip, the impact current is reduced through the parallel current-limiting resistor, the problem that the impact current in a power supply influences the service life of a product is solved, the reliability is improved, the input and output voltages are filtered through the two-stage filtering unit, the stability of the output voltage is improved, and the power supply quality of a load is improved.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A voltage converting circuit having a current limiting function, comprising: the current-limiting protection circuit comprises a voltage conversion chip, a first filtering unit, a second filtering unit and a current-limiting protection unit, wherein the first end of the current-limiting protection unit is electrically connected with the power supply end of a power supply, the second end of the current-limiting protection unit is electrically connected with the input end of the voltage conversion chip, and the current-limiting protection unit comprises a first current-limiting resistor and a second current-limiting resistor which are connected in parallel;
the output end of the voltage conversion chip is electrically connected with an electric load, a first node is arranged between the voltage conversion chip and the current-limiting protection unit, a second node is arranged between the voltage conversion chip and the electric load, and the voltage conversion chip is used for converting a first voltage provided by the power supply end of the power supply into a second voltage;
the first end of the first filtering unit is electrically connected with the first node, the second end of the first filtering unit is grounded, and the first filtering unit is used for filtering the voltage of the input end of the voltage conversion chip;
and the first end of the second filtering unit is electrically connected with the second node, the second end of the second filtering unit is grounded, and the second filtering unit is used for filtering the voltage at the output end of the voltage conversion chip.
2. The voltage conversion circuit with the current-limiting function according to claim 1, wherein the voltage conversion chip comprises an MSK5101 power chip, and the MSK5101 power chip is used for converting a +5V dc voltage into a +1.8V dc voltage.
3. The voltage conversion circuit with current-limiting function according to claim 2, wherein the voltage conversion chip is provided with an enable pin EN and an output voltage regulation pin FB, wherein the enable pin EN is electrically connected to the current-limiting protection unit through a pull-up resistor, and the output voltage regulation pin FB is electrically connected to the voltage dividing circuit;
the voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor which are connected in series, a first end of the first voltage dividing resistor is electrically connected with a first end of the second filtering unit, a second end of the first voltage dividing resistor is electrically connected with a first end of the second voltage dividing resistor, a second end of the second voltage dividing resistor is grounded, a third node is arranged between the first voltage dividing resistor and the second voltage dividing resistor, and the output voltage regulating pin FB is electrically connected with the third node.
4. The voltage conversion circuit with current limiting function according to any one of claims 1 to 3, wherein the first filtering unit comprises a first capacitor, a second capacitor and a first filtering branch connected in parallel, and the first filtering branch comprises a third capacitor and a fourth capacitor connected in series.
5. The voltage conversion circuit with current limiting function of claim 4, wherein said first capacitor and said second capacitor are patch capacitors, and said third capacitor and said fourth capacitor are electrolytic capacitors.
6. The voltage conversion circuit with current limiting function according to any one of claims 1 to 3, wherein the second filtering unit comprises a fifth capacitor and a second filtering branch connected in parallel, and the second filtering branch comprises a sixth capacitor and a seventh capacitor connected in series.
7. The voltage conversion circuit with current-limiting function of claim 6, wherein said fifth capacitor is a patch capacitor, and said sixth capacitor and said seventh capacitor are electrolytic capacitors.
8. The voltage conversion circuit with current limiting function according to any one of claims 1 to 3, further comprising: the surge suppression circuit comprises a first fuse and a standby branch circuit connected with the first fuse in parallel, the standby branch circuit comprises a second fuse and a shunt resistor assembly which are connected in series, and the ratio of the resistance value of the first fuse to the resistance value of the standby branch circuit is smaller than 1: 2.
9. A power supply device characterized by comprising the voltage conversion circuit with current limiting function of any one of claims 1 to 8.
10. An aircraft, characterized in that it comprises a power supply device according to claim 9.
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| CN202022161755.3U CN213125848U (en) | 2020-09-27 | 2020-09-27 | Voltage conversion circuit with current limiting function, power supply equipment and aircraft |
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| CN202022161755.3U CN213125848U (en) | 2020-09-27 | 2020-09-27 | Voltage conversion circuit with current limiting function, power supply equipment and aircraft |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113364258A (en) * | 2021-05-31 | 2021-09-07 | 宁波三星医疗电气股份有限公司 | DC-DC circuit with controllable current-limiting point and power supply circuit |
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2020
- 2020-09-27 CN CN202022161755.3U patent/CN213125848U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113364258A (en) * | 2021-05-31 | 2021-09-07 | 宁波三星医疗电气股份有限公司 | DC-DC circuit with controllable current-limiting point and power supply circuit |
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