CN118074568A - Current-limiting starting circuit of direct-current fan, direct-current fan module and energy storage system - Google Patents
Current-limiting starting circuit of direct-current fan, direct-current fan module and energy storage system Download PDFInfo
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- CN118074568A CN118074568A CN202410091058.5A CN202410091058A CN118074568A CN 118074568 A CN118074568 A CN 118074568A CN 202410091058 A CN202410091058 A CN 202410091058A CN 118074568 A CN118074568 A CN 118074568A
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Abstract
The application provides a direct current fan current limiting starting circuit, a direct current fan module and an energy storage system. The application relates to a direct current fan current limiting starting circuit, which comprises: the starting switch is connected between the direct-current power supply and the direct-current fan; the current limiting resistor is connected in series between the starting switch and the direct current fan; the time relay is connected in parallel with the current limiting resistor and the two ends of the direct current fan, and the normally open contact of the time relay is connected in parallel with the current limiting resistor; after the start switch is closed, the time relay is powered on and counts time: when the timing of the time relay does not reach the set time value, the normally open contact of the time relay is not closed, and the current limiting resistor limits the starting current of the direct current fan; when the timing of the time relay reaches the set time value, the normally open contact is closed, the current limiting resistor is bypassed, and the current limiting start of the direct current fan is finished. The application can conveniently apply the timing function of the time relay to simply and quickly set and adjust the current limiting time when the direct current fan is started.
Description
Technical Field
The application relates to the technical field of energy storage systems, in particular to a direct current fan current limiting starting circuit, a direct current fan module and an energy storage system.
Background
The compact development trend of the air-cooled modular energy storage converter makes a small-volume and large-air-volume direct-current fan a preferred heat dissipation mode. When the direct-current fan is directly started, the peak current of the direct-current fan is generally about 3 to 4 times of rated working current, and the power supply capacity of the direct-current fan is required to be 4 to 5 times of rated power of the fan, so that the over-current protection function of the power supply is prevented from being triggered by the peak current of the direct-current fan. However, this may result in a power supply rated power of about 20% to 25% of the power supply power when the dc fan is operated, and the power supply has a low utilization rate.
In order to limit peak current when the direct current fan is started, two common current limiting starting technical schemes are as follows: 1) The semiconductor switching device is used as a current limiting starting scheme of a core component, and the scheme adjusts the current limiting time and needs to redesign and test the parameters of an opening circuit of the semiconductor switching device for a plurality of times. 2) The scheme of time-delay current-limiting starting built by the semiconductor device is complex in circuit, and the parameters of part of resistance-capacitance elements in the circuit are redesigned and tested for multiple times for adjusting the current-limiting time.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provides a current limiting starting circuit of a direct current fan, which can simply and quickly set and adjust the current limiting time when the direct current fan is started.
Based on the provided direct current fan current limiting starting circuit, the application further provides a direct current fan module and an energy storage system.
In order to achieve the above purpose, the application adopts the following technical scheme:
according to a first aspect of the present application, there is provided a current limiting start circuit for a direct current fan, comprising:
the starting switch is connected between the direct-current power supply and the direct-current fan;
The current limiting resistor is connected in series between the starting switch and the direct current fan;
The time relay is connected in parallel with the current limiting resistor and the two ends of the direct current fan, and the normally open contact of the time relay is connected in parallel with the current limiting resistor;
After the starting switch is closed, the time relay is powered on and counts the time: when the timing of the time relay does not reach the set time value, the normally open contact of the time relay is not closed, and the current limiting resistor limits the starting current of the direct current fan; when the timing of the time relay reaches the set time value, the normally open contact is closed, the current limiting resistor is bypassed, and the current limiting start of the direct current fan is finished.
According to a second aspect of the present application, a dc fan module is provided, which includes a dc fan and the aforementioned dc fan current limiting starting circuit, for limiting the current when the dc fan is started.
According to a third aspect of the present application, an energy storage system is provided, which includes an energy storage controller, an energy storage converter, and a dc fan, the dc fan dissipates heat from the energy storage converter, and the energy storage system further includes the foregoing dc fan current limiting starting circuit module, which is configured to limit a current when the dc fan is started.
The scheme of the application has the characteristics and advantages that:
According to the direct-current fan current-limiting starting circuit, the starting switch is arranged between the direct-current power supply and the direct-current fan, the current-limiting resistor is connected in series between the starting switch and the direct-current fan, the time relay is connected in parallel to the two ends of the current-limiting resistor and the direct-current fan, meanwhile, the normally open contact of the time relay is connected in parallel with the current-limiting resistor, and therefore the timing function of the time relay can be conveniently applied, the timing parameter of the time relay is set by combining the time design of the direct-current fan current-limiting starting: the time relay is timed to be shorter than the set time, and the current limiting resistor limits the starting current of the direct current fan; the time relay reaches the set time at fixed time, the normally open contact of the time relay closes the bypass current limiting resistor, the current limiting start of the direct current fan is finished, and the purpose of simply and quickly setting and adjusting the current limiting time when the direct current fan is started is achieved.
The direct current fan module and the energy storage system of the scheme of the application are utilized to limit the current when the direct current fan is started by the direct current fan current limiting starting circuit, so that the over-current protection of the power supply can be prevented from being triggered by peak current when the direct current fan is directly started, the power supply power can be improved when the direct current fan is operated, and the utilization rate of the power supply is further improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a DC fan current limiting starting circuit according to the present application;
FIG. 2 is a schematic diagram of another DC fan current limiting starting circuit according to the present application;
fig. 3 is a schematic structural diagram of a current limiting starting circuit of a dc fan according to the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It is noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present application and in the foregoing figures, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
Example 1
According to a first aspect of the present application, referring to fig. 1, an embodiment of the present application provides a current limiting start circuit of a dc fan, including:
a start switch SW connected between the DC power supply VCC and the DC fan;
The current limiting resistor R is connected in series between the starting switch SW and the direct current fan;
The time relay is connected in parallel with the current limiting resistor R and the two ends of the direct current fan, and the normally open contact K1 of the time relay is connected in parallel with the current limiting resistor R;
After the start switch SW is closed, the time relay is powered on and counts time: when the timing of the time relay does not reach a set time value, a normally open contact K1 of the time relay is not closed, and the current limiting resistor R limits the starting current of the direct current fan; when the timing of the time relay reaches the set time value, the normally open contact K1 is closed, the current limiting resistor R is bypassed, and the current limiting start of the direct current fan is finished.
Therefore, according to the direct current fan current-limiting starting circuit, the starting switch is arranged between the direct current power supply and the direct current fan, the current-limiting resistor is connected in series between the starting switch and the direct current fan, the time relay is connected in parallel to the two ends of the current-limiting resistor and the direct current fan, meanwhile, the normally open contact of the time relay is connected in parallel to the current-limiting resistor, the timing function of the time relay can be conveniently applied, and the timing parameters of the time relay are set by combining the time design of the current-limiting starting of the direct current fan: the time relay is timed to be shorter than the set time, and the current limiting resistor limits the starting current of the direct current fan; the time relay reaches the set time at fixed time, the normally open contact of the time relay closes the bypass current limiting resistor, the current limiting start of the direct current fan is finished, and the purpose of simply and quickly setting and adjusting the current limiting time when the direct current fan is started is achieved.
Referring to fig. 2, according to some embodiments of the present application, the dc fan current-limiting starting circuit further includes a first anti-reflection diode D1, the first anti-reflection diode D1 is connected in series between the starting switch SW and the current-limiting resistor R, and a negative electrode thereof is connected to the current-limiting resistor R.
Still referring to fig. 2, according to some embodiments of the present application, the dc fan current limiting starting circuit further includes a second anti-reflection diode D2, the second anti-reflection diode D2 is connected in series between the starting switch SW and the time relay, and a negative electrode thereof is connected to the time relay.
The working principle of the current limiting start of the direct current fan is as follows: when the starting switch SW is closed or switched on, the anti-reflection diode D2 is positively conducted, the time relay is electrified, and timing is performed: the timing of the time relay does not reach a set time value, a normally open contact K1 of the time relay is not closed, the anti-reflection diode D1 is conducted forward, and the current limiting resistor R is connected in series among the direct current power supply, the anti-reflection diode D1 and the direct current fan to limit the starting current of the direct current fan; the timing of the time relay reaches a set time value, the normally open contact K1 of the time relay is closed, the bypass current limiting resistor R is bypassed, and the current limiting starting process of the direct current fan is finished.
By adding the first anti-reflection diode D1 and/or the second anti-reflection diode D2 in the circuit, the problem that the direct current fan is burnt due to the reverse polarity connection of the direct current power supply is avoided, and the reliability of actual use is improved.
Referring to fig. 3, according to some embodiments of the application, the normally open contact of the time relay is provided with two or more paths (K1, K2,) each in parallel with the current limiting resistor R. Through setting up the normally open contact of more than one way, can strengthen the reliability of circuit, when time relay timing reaches the settlement time value like this, as long as there is normally open contact to close all the way, just can bypass current-limiting resistor R, the current-limiting starting process of ending direct current fan, avoid only setting up under the normally open contact circumstances of one way, if it leads to carrying out the current-limiting to direct current fan for a long time because of the failure unable closure, cause the unable normal operating hidden danger of direct current fan.
It should be noted that, considering that the peak current of direct start of the dc fan is about 3 to 4 times of rated working current, the power of the power supply during operation is about 20% to 25% of rated power of the power supply, and considering that multiple dc fans may be used in parallel in practice, the resistance range of the current limiting resistor R is generally selected to be 10% -40% of equivalent impedance of the dc fan. In addition, the set current limiting time value of the direct current fan is too long, which can affect the normal operation of the direct current fan, but if the set current limiting time is too short, the peak current during starting cannot be well restrained, so the set time value range of the time relay is generally selected to be 10 seconds to 30 seconds. After a starting switch of the direct current fan is closed, the time relay is powered on and counts time: when the set time value is not reached, the normally open contact of the time relay is not closed, and the current limiting resistor limits the starting current of the direct current fan; when the timing reaches the set time value, the normally open contact of the time relay is closed, the current limiting resistor is bypassed, and the current limiting start of the direct current fan is finished.
Example 2
According to a second aspect of the present application, an embodiment of the present application further provides a dc fan module, which includes a dc fan, and further includes the dc fan current limiting starting circuit in the foregoing embodiment 1, configured to limit a current when the dc fan is started.
According to the direct-current fan module, the direct-current fan current-limiting starting circuit of the embodiment 1 is utilized to limit the current when the direct-current fan is started, so that the phenomenon that the peak current when the direct-current fan is directly started triggers the overcurrent protection of the power supply can be avoided, the power supply power when the direct-current fan is operated can be improved, and the utilization rate of the power supply is further improved.
Example 3
According to a third aspect of the present application, an embodiment of the present application further provides an energy storage system, including an energy storage converter and a dc fan, the dc fan dissipates heat from the energy storage converter, and the energy storage system further includes the dc fan current limiting starting circuit of the foregoing embodiment 1, configured to limit a current when the dc fan is started.
According to some embodiments of the application, a start switch in the direct current fan current limiting start circuit is controlled to be closed or opened by an energy storage converter. Referring to fig. 2 and 3, the energy storage controller is used as a control component of the energy storage converter, directly controls a start switch in the current-limiting start circuit of the direct current fan, and closes the start switch in the current-limiting start circuit of the direct current fan when the energy storage converter is started, so as to control the direct current fan to start and ensure that the direct current fan dissipates heat of the energy storage converter in time.
When the direct current fan is started, the direct current fan current limiting starting circuit limits the starting current of the direct current fan until the time relay reaches the set time value, the normally open contact is closed, the current limiting resistor is bypassed, the current limiting starting of the direct current fan is finished, so that the phenomenon that the peak current when the direct current fan is directly started triggers the overcurrent protection of the power supply can be avoided, the power supply power when the direct current fan runs can be improved, and the utilization rate of the power supply is further improved.
Finally, it should be noted that:
The embodiment numbers of the present application are merely for description and do not represent advantages or disadvantages of the embodiments. In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments. Embodiments of the application may be implemented in hardware, software, firmware, or a combination thereof.
Claims (9)
1. A direct current fan current limiting start-up circuit, characterized by comprising:
the starting switch is connected between the direct-current power supply and the direct-current fan;
The current limiting resistor is connected in series between the starting switch and the direct current fan;
The time relay is connected in parallel with the current limiting resistor and the two ends of the direct current fan, and the normally open contact of the time relay is connected in parallel with the current limiting resistor;
After the starting switch is closed, the time relay is powered on and counts the time: when the timing of the time relay does not reach the set time value, the normally open contact of the time relay is not closed, and the current limiting resistor limits the starting current of the direct current fan; when the timing of the time relay reaches the set time value, the normally open contact is closed, the current limiting resistor is bypassed, and the current limiting start of the direct current fan is finished.
2. The direct current fan current limiting starting circuit of claim 1, further comprising a first anti-reflection diode connected in series between the starting switch and the current limiting resistor, and having a negative electrode connected to the current limiting resistor.
3. The direct current fan current limiting starting circuit of claim 1, further comprising a second anti-reflection diode connected in series between the starting switch and the time relay, and having a negative electrode connected to the time relay.
4. The direct current fan current limiting starting circuit according to claim 1, wherein the normally open contact of the time relay is provided with two or more paths, and each path is connected in parallel with the current limiting resistor.
5. The direct current fan current limiting starting circuit according to claim 1, wherein the current limiting resistor has a resistance ranging from 10% to 40% equivalent impedance of the direct current fan.
6. The direct current fan current limiting start circuit of claim 1, wherein the set time range is 10 seconds to 30 seconds.
7. A direct current fan module comprising a direct current fan, and further comprising the direct current fan current limiting starting circuit of any one of claims 1 to 6 for limiting the current when the direct current fan is started.
8. An energy storage system comprising an energy storage converter and a direct current fan, wherein the direct current fan dissipates heat from the energy storage converter, and the energy storage system is characterized by further comprising the direct current fan current limiting starting circuit according to any one of claims 1-6, and the direct current fan current limiting starting circuit is used for limiting current when the direct current fan is started.
9. The energy storage system of claim 8, wherein the start switch in the dc fan current limiting start circuit is controlled to be closed or opened by the energy storage converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410091058.5A CN118074568A (en) | 2024-01-23 | 2024-01-23 | Current-limiting starting circuit of direct-current fan, direct-current fan module and energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410091058.5A CN118074568A (en) | 2024-01-23 | 2024-01-23 | Current-limiting starting circuit of direct-current fan, direct-current fan module and energy storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118074568A true CN118074568A (en) | 2024-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410091058.5A Pending CN118074568A (en) | 2024-01-23 | 2024-01-23 | Current-limiting starting circuit of direct-current fan, direct-current fan module and energy storage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118074568A (en) |
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- 2024-01-23 CN CN202410091058.5A patent/CN118074568A/en active Pending
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