CN204003554U - Cooling fan of frequency converter control circuit - Google Patents
Cooling fan of frequency converter control circuit Download PDFInfo
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- CN204003554U CN204003554U CN201420457450.9U CN201420457450U CN204003554U CN 204003554 U CN204003554 U CN 204003554U CN 201420457450 U CN201420457450 U CN 201420457450U CN 204003554 U CN204003554 U CN 204003554U
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- radiation fan
- comparing unit
- control circuit
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Abstract
The utility model discloses a kind of cooling fan of frequency converter control circuit, for control the open and close of radiation fan according to the temperature of frequency variator inside, comprise temperature detecting unit, there is a temperature sensing element, the temperature of frequency variator inside to be detected and to export a checkout value; Comparing unit, is coupled to temperature sensing circuit, compares, and export a comparison value with right checkout value and a default reference value; Switch element, has a switching element, and switching element is coupled to comparison circuit, to control the open and close of radiation fan according to comparison value; Regulation unit, in response to comparison value so that checkout value or reference signal are adjusted.The utility model can reduce the startup frequency of radiation fan, prevents that radiation fan from breaking down, and can reduce the noise causing because of radiation fan frequent starting to realize.
Description
Technical field
The utility model belongs to technical field of electricity, relates to a kind of cooling fan of frequency converter control circuit.
Background technique
Frequency variator (Variable-frequency Drive, VFD) is application converter technique and microelectronic technology, controls the electric control appliance of Wechselstrommotor by changing machine operation power supply frequency mode.Frequency variator is mainly made up of rectification (AC-DC), filtering, inversion (direct current becomes interchange), brake unit, driver element, detection unit microprocessing unit etc.Voltage and the frequency of cut-offfing to adjust out-put supply of the inner IGBT of portion of frequency variator; provide its needed supply voltage according to the actual demand of motor, and then reach object energy-conservation, speed governing, in addition; frequency variator also has a lot of protective functions, as overcurrent, overvoltage, overload protection etc.Along with improving constantly of industrial automatization, frequency variator has also obtained application very widely.
Frequency variator inside is provided with radiation fan, and control the control circuit of this radiation fan, this control circuit can detect the real-time temperature of frequency variator inside, if the temperature detecting is greater than the upper limiting temperature value setting in advance, this control circuit will be opened radiation fan so, to realize the heat radiation to frequency variator inside, below the temperature of frequency variator inside drops to upper limiting temperature value time, control circuit will cut out this radiation fan.But there is like this problem, if the temperature of frequency variator inside only changes near above-mentioned upper limiting temperature value exactly, so, the open and close of radiation fan will be too frequent, so just likely can cause radiation fan to break down, meanwhile, radiation fan starts and also can bring more noise too frequently, affects working environment.
Model utility content
The deficiency existing for prior art, the purpose of this utility model is to provide a kind of cooling fan of frequency converter control circuit, it has simple in structure, multiple functional advantage, it can reduce the startup frequency of radiation fan, prevent that to realize radiation fan from breaking down, and can reduce the noise causing because of radiation fan frequent starting.
For achieving the above object, the utility model provides following technological scheme:
A kind of cooling fan of frequency converter control circuit, for control the open and close of radiation fan according to the temperature of frequency variator inside, comprises temperature detecting unit, has a temperature sensing element, the temperature of frequency variator inside to be detected and to export a checkout value; Comparing unit, is coupled to described temperature sensing circuit, compares, and export a comparison value with the checkout value to described and a default reference value; Switch element, has a switching element, and described switching element is coupled to described comparison circuit, to control the open and close of radiation fan according to described comparison value; Regulation unit, in response to described comparison value so that described checkout value or reference signal are adjusted.
Described temperature detecting unit also comprises a divider resistance, and described divider resistance is coupled between a power supply and described temperature sensing element, and the described temperature sensing element the other end is coupled to a grounding end.
Described comparing unit has
One first input end, is coupled between described divider resistance and described temperature sensing element, to receive described checkout value; One second input end, to receive described default reference value; And an output terminal, to export described comparison value.
Described switching element is nmos pass transistor, and the grid of this nmos pass transistor is coupled to the output terminal of comparing unit, and source electrode is coupled to a second voltage source, and drain electrode is coupled to the positive pole of radiation fan.
In the utility model one embodiment, described regulation unit comprises a nmos pass transistor, and the grid of this nmos pass transistor is coupled to the output terminal of described comparing unit, and drain electrode is coupled to a grounding end; And a resistance, be coupled to the source electrode of this nmos pass transistor and the second input end of described comparing unit.
Like this, in the present embodiment, in the time that checkout value is greater than reference value, radiation fan starts, regulation unit can carry out an adjustment to reference value simultaneously, the magnitude of voltage receiving to change the second input end of comparing unit, so, only have and be reduced to after the magnitude of voltage that is less than after the adjustment that the second input end of comparing unit receives instead of reference value before when checkout value, radiation fan just can stop operating, after radiation fan stops operating, regulation unit will stop it and adjust function, like this, default reference value before the magnitude of voltage that the second input end of comparing unit receives can equal again, so just can not affect the normal startup of radiation fan.
In another embodiment of the utility model, described regulation unit comprises a nmos pass transistor, and the grid of this nmos pass transistor is coupled to the output terminal of described comparing unit, and source electrode is coupled to a tertiary voltage source; And a resistance, described resistance is coupled between the input end of described comparing unit and the drain electrode of this NMOS pipe.
Like this, in the present embodiment, in the time that checkout value is greater than reference value, radiation fan starts, regulation unit can enter an adjustment to checkout value simultaneously, the magnitude of voltage receiving to draw high the input end of comparing unit, so, after only having value when checkout value to be reduced to the value that default reference value draws high between deducting, radiation fan just can stop operating, then, after radiation fan stops operating, regulation unit will stop it and adjust function, like this, the magnitude of voltage that the input end of comparing unit receives can equal again the checkout value of temperature sensing element, so just can not affect the normal startup of radiation fan.
In sum, the utility model is realized too high impact on radiation fan and the noise of generation of causing of frequency that prevents that radiation fan from opening and closing on the voltage adjustment of checkout value or reference value by above-mentioned regulation unit.
Brief description of the drawings
Fig. 1 is the utility model embodiment one circuit diagram;
Fig. 2 is the utility model embodiment two circuit diagram;
Fig. 3 is the sequential chart before the utility model does not improve;
Fig. 4 is the utility model embodiment one sequential chart;
Fig. 5 is the utility model embodiment two sequential chart.
Accompanying drawing mark:
100: temperature detecting unit,
200: comparing unit,
300: regulation unit,
400: switch element,
500: radiation fan,
R1: pull-up resistor,
Rt: temperature sensing element,
N3: switching element,
Vt: checkout value,
Vref: reference value,
Vin_1: the magnitude of voltage of comparing unit the second input end,
Vin_2: the magnitude of voltage of comparing unit first input end,
Vout: the magnitude of voltage of comparing unit output terminal,
Δ V1: to the adjusting range of Vref,
Δ V2: to the adjusting range of Vt.
Embodiment
Referring to figs. 1 through Fig. 5, the utility model embodiment is described further.
As shown in Figure 1 or 2, a kind of cooling fan of frequency converter 500 control circuits, for control the open and close of radiation fan 500 according to the temperature of frequency variator inside, comprise temperature detecting unit 100, there is a temperature sensing element, the temperature of frequency variator inside to be detected and to export a checkout value; Comparing unit 200, is coupled to temperature sensing circuit, compares, and export a comparison value with right checkout value and a default reference value; Switch element 400, has a switching element, and switching element is coupled to comparison circuit, to control the open and close of radiation fan 500 according to comparison value; Regulation unit 300, in response to comparison value so that checkout value or reference signal are adjusted.
Temperature detecting unit 100 also comprises a divider resistance, and divider resistance is coupled between a power supply and temperature sensing element, and the temperature sensing element the other end is coupled to a grounding end.
Comparing unit 200 has a first input end, is coupled between divider resistance and temperature sensing element, to receive checkout value; One second input end, to receive default reference value; And an output terminal, to export comparison value.
Switching element is nmos pass transistor N3, and the grid of this nmos pass transistor N3 is coupled to the output terminal of comparing unit 200, and source electrode is coupled to a second voltage source, and drain electrode is coupled to the positive pole of radiation fan 500.
Embodiment one:
As shown in Figure 1, regulation unit 300 comprises a nmos pass transistor N1, and the grid of this nmos pass transistor N1 is coupled to the output terminal of comparing unit 200, and drain electrode is coupled to a grounding end; And a resistance R 2, be coupled to the source electrode of this nmos pass transistor N1 and the second input end of comparing unit 200.
Like this, in the present embodiment, when checkout value Vt rises to while equaling reference value Vref, radiation fan 500 starts, now Vin=Vt=Vref, Vout is high level, regulation unit 300 can carry out an adjustment to reference value Vref simultaneously, the magnitude of voltage Vin_1 receiving to change the second input end of comparing unit 200, here, the adjusting range of Vref is set to Δ V1, now, Vin_1=Vref-Δ V1, so, only have and be reduced to after the magnitude of voltage Vref-Δ V1 instead of reference value Vref being before less than after the adjustment that the second input end of comparing unit 200 receives as checkout value Vt, radiation fan 500 just can stop operating, now, Vin=Vt<Vin_1=Vref-Δ V1, Vout is low level, after radiation fan 500 stops operating, regulation unit 300 will stop it and adjust function, and like this, default reference value before the magnitude of voltage that the second input end of comparing unit 200 receives can equal again, so just can not affect the normal startup of radiation fan 500.
Embodiment two:
As shown in Figure 2, regulation unit 300 comprises a nmos pass transistor N2, and the grid of this nmos pass transistor N2 is coupled to the output terminal of comparing unit 200, and source electrode is coupled to a tertiary voltage source; And a resistance R 3, resistance is coupled between the input end of comparing unit 200 and the drain electrode of this NMOS pipe N2.
Like this, in the present embodiment, in the time that checkout value Vt equals reference value Vref, radiation fan 500 starts, now, Vin_2=Vt=Vref, Vout is high level, and regulation unit 300 can carry out an adjustment to checkout value Vt, the magnitude of voltage V-in_2 receiving to draw high the first input end of comparing unit 200 simultaneously, now, Vin_2=Vt+ Δ V2; Here establishing the amplitude that regulation unit 300 draws high checkout value, is Δ V2; So, only have after value as the checkout value Vt value lower than default reference value Vref-Δ V2, radiation fan 500 just can stop operating, now, Vref-Δ V2>Vin_2=Vt, Vout is low level; Then, after radiation fan 500 stops operating, regulation unit 300 will stop it and adjust function, like this, the magnitude of voltage Vin that the first input end of comparing unit 200 receives can equal again the checkout value Vt of temperature sensing element, so just can not affect the normal startup of radiation fan 500.
The utility model gives three sequential charts, Fig. 3 is the sequential chart before the utility model does not improve, Fig. 4 is embodiment one sequential chart, and Fig. 5 is embodiment two sequential chart, by contrasting three sequential charts, what can be perfectly clear observes, be provided with after above-mentioned regulation unit 300, the cycle of the waveform of the output Vout of comparing unit 200 obviously becomes large, and this diminishes with regard to the switching frequency that makes switching element N3, that is to say, the keying frequency of radiation fan 500 has reduced.
To sum up, the utility model is realized and is prevented too high impact on radiation fan 500 and the noise of generation of causing of frequency that radiation fan 500 opens and closes the voltage adjustment of checkout value or reference value by above-mentioned regulation unit 300.
Claims (6)
1. a cooling fan of frequency converter control circuit, for control the open and close of radiation fan according to the temperature of frequency variator inside, is characterized in that: comprise
Temperature detecting unit, has a temperature sensing element, the temperature of frequency variator inside to be detected and to export a checkout value;
Comparing unit, is coupled to described temperature sensing circuit, compares, and export a comparison value with the checkout value to described and a default reference value;
Switch element, has a switching element, and described switching element is coupled to described comparison circuit, to control the open and close of radiation fan according to described comparison value;
Regulation unit, in response to described comparison value so that described checkout value or reference signal are adjusted.
2. cooling fan of frequency converter control circuit according to claim 1, it is characterized in that: described temperature detecting unit also comprises a divider resistance, described divider resistance is coupled between a power supply and described temperature sensing element, and the described temperature sensing element the other end is coupled to a grounding end.
3. cooling fan of frequency converter control circuit according to claim 2, is characterized in that: described comparing unit has
One first input end, is coupled between described divider resistance and described temperature sensing element, to receive described checkout value;
One second input end, to receive described default reference value;
And an output terminal, to export described comparison value.
4. cooling fan of frequency converter control circuit according to claim 2, it is characterized in that: described switching element is nmos pass transistor, the grid of this nmos pass transistor is coupled to the output terminal of comparing unit, and source electrode is coupled to a second voltage source, and drain electrode is coupled to the positive pole of radiation fan.
5. cooling fan of frequency converter control circuit according to claim 3, is characterized in that: described regulation unit comprises a nmos pass transistor, the grid of this nmos pass transistor is coupled to the output terminal of described comparing unit, and drain electrode is coupled to a grounding end; And a resistance, be coupled to the source electrode of this nmos pass transistor and the second input end of described comparing unit.
6. cooling fan of frequency converter control circuit according to claim 3, is characterized in that: described regulation unit comprises a nmos pass transistor, the grid of this nmos pass transistor is coupled to the output terminal of described comparing unit, and source electrode is coupled to a tertiary voltage source; And a resistance, described resistance is coupled between the input end of described comparing unit and the drain electrode of this NMOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420457450.9U CN204003554U (en) | 2014-08-13 | 2014-08-13 | Cooling fan of frequency converter control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420457450.9U CN204003554U (en) | 2014-08-13 | 2014-08-13 | Cooling fan of frequency converter control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204003554U true CN204003554U (en) | 2014-12-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420457450.9U Expired - Fee Related CN204003554U (en) | 2014-08-13 | 2014-08-13 | Cooling fan of frequency converter control circuit |
Country Status (1)
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| CN (1) | CN204003554U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589327A (en) * | 2017-09-19 | 2018-01-16 | 天津康途科技有限公司 | A kind of detection means of fan of frequency converter failure |
| CN109219314A (en) * | 2018-08-21 | 2019-01-15 | 泰豪科技股份有限公司 | A kind of radiating circuit and system |
| CN112612312A (en) * | 2020-12-15 | 2021-04-06 | 青岛海信日立空调系统有限公司 | Heat dissipation control circuit and air conditioner |
-
2014
- 2014-08-13 CN CN201420457450.9U patent/CN204003554U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589327A (en) * | 2017-09-19 | 2018-01-16 | 天津康途科技有限公司 | A kind of detection means of fan of frequency converter failure |
| CN109219314A (en) * | 2018-08-21 | 2019-01-15 | 泰豪科技股份有限公司 | A kind of radiating circuit and system |
| CN109219314B (en) * | 2018-08-21 | 2021-11-16 | 泰豪科技股份有限公司 | Heat dissipation circuit and system |
| CN112612312A (en) * | 2020-12-15 | 2021-04-06 | 青岛海信日立空调系统有限公司 | Heat dissipation control circuit and air conditioner |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20210813 |
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| CF01 | Termination of patent right due to non-payment of annual fee |