CN204851729U - A PWM fan control circuit for refrigerator - Google Patents
A PWM fan control circuit for refrigerator Download PDFInfo
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- CN204851729U CN204851729U CN201520464475.6U CN201520464475U CN204851729U CN 204851729 U CN204851729 U CN 204851729U CN 201520464475 U CN201520464475 U CN 201520464475U CN 204851729 U CN204851729 U CN 204851729U
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- pwm
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- semiconductor
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- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The utility model provides a PWM fan control circuit for refrigerator, the PWM fan has power port, PWM signal port, feedback port and ground connection port. The PWM fan control circuit is including supply circuit and the master control circuit of port with PWM fan working power supply VCC that connect, supply circuit includes and is used for controlling the power control switch of supply circuit break -make, master control circuit including be connected to PWM signal port PWM signal circuit, be connected to the feedback port feedback circuit and be connected to power control switch's signal battery line. Adopt the utility model provides a PWM fan control circuit for refrigerator, when the bring to rest of PWM fan, master control circuit passes through the signal battery aline supply circuit's power control switch sends the disconnection instruction, effectively avoids the stand -by power consumption of PWM fan by this.
Description
Technical field
The utility model relates to refrigerator control field, particularly a kind of PWM draught fan control circuit for refrigerator.
Background technique
For reply market and user Geng Gao demand, simultaneously also in order to reduce the energy consumption of refrigerator, refrigerator product more and more introduces variable-speed blower fan.Existing PWM blower fan, in refrigerator product uses, is generally provided with VCC power line, pwm signal line, feedback signal line and GND ground wire.Wherein, the rotating speed of the PWM Duty ratio control PWM blower fan of pwm signal line input, corresponding relation is that the full rotating speed of dutycycle 0 ~ 100% corresponding PWM blower fan stopping ~ blower fan runs.
When said PWM blower fan uses, the different duty sent by pwm signal line realizes the adjustment of rotating speed, and when not needing PWM blower fan to work, pwm signal line sends the signal that dutycycle is 0, makes the stall of PWM blower fan.But now PWM blower fan still also exists stand-by power consumption.
Therefore, be necessary to provide a kind of PWM draught fan control circuit for refrigerator newly.
Model utility content
The utility model object is to provide a kind of PWM draught fan control circuit for refrigerator, when PWM blower fan is out of service, can eliminate stand-by power consumption.
For realizing above-mentioned model utility object, the utility model provides a kind of PWM draught fan control circuit for refrigerator, and described PWM blower fan has power port, pwm signal port, feedback port and grounding ports.Described PWM draught fan control circuit comprises the power supply circuits and governor circuit that connect power port and PWM blower fan working power VCC, described power supply circuits comprise the power control switch controlling described power supply circuits break-make, described governor circuit comprise be connected to pwm signal port pwm signal circuit, be connected to the feeder loop of feedback port and be connected to the power signal line of described power control switch.
As further improvement of the utility model, described power control switch comprises P type metal-oxide-semiconductor, source electrode and the drain electrode of described P type metal-oxide-semiconductor are electrically connected to the power port of PWM blower fan working power VCC and PWM blower fan respectively, are provided with the first resistance R1 between the grid of described P type metal-oxide-semiconductor and source electrode.
As further improvement of the utility model, between the drain electrode of described P type metal-oxide-semiconductor and source electrode, be also provided with bypass diode D.
As further improvement of the utility model, described power control switch also comprises triode Q, and the base stage of described triode Q is connected to the power signal line of described governor circuit, and collector electrode is connected to the grid of described P type metal-oxide-semiconductor, and grounded-emitter connection is arranged.
As further improvement of the utility model, between the collector electrode of described triode Q and described P type metal-oxide-semiconductor, be also provided with the second resistance R2.
As further improvement of the utility model, described pwm signal circuit comprises the 3rd resistance R3 and in the 4th resistance R4 be arranged in parallel and the first electric capacity C1.
As further improvement of the utility model, described feeder loop comprises the 5th resistance R5 and the second electric capacity C2.
As further improvement of the utility model, described feeder loop also comprises the 6th resistance R6 and is connected to feeder loop stabilized power supply VCC ＇ by described 6th resistance R6.
The beneficial effects of the utility model are: adopt the PWM draught fan control circuit for refrigerator that the utility model provides, when PWM blower fan is out of service, governor circuit sends open command by the power control switch of power supply circuits described in power supply signal alignment, effectively avoids the stand-by power consumption of PWM blower fan by this.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model for the PWM draught fan control circuit of refrigerator.
Embodiment
Below with reference to mode of execution shown in the drawings, the utility model is described in detail.But this mode of execution does not limit the utility model, the structure that those of ordinary skill in the art makes according to this mode of execution, method or conversion functionally are all included in protection domain of the present utility model.
Be illustrated in figure 1 the schematic diagram of the utility model for the PWM draught fan control circuit of refrigerator.Described PWM blower fan has power port 1, pwm signal port 2, feedback port 3 and grounding ports 4.Described PWM draught fan control circuit comprises the power supply circuits and governor circuit that connect described power port 1 and PWM blower fan working power VCC.Described power supply circuits comprise the power control switch controlling described power supply circuits break-make; Described governor circuit comprise be connected to pwm signal port 2 pwm signal circuit, be connected to the feeder loop of feedback port 3 and be connected to the power signal line of described power control switch.
Particularly, described power control switch comprises interconnective P type metal-oxide-semiconductor and triode Q, and source electrode and the drain electrode of described P type metal-oxide-semiconductor are connected to the power port 1 of PWM blower fan working power VCC and PWM blower fan respectively.Be provided with the first resistance R1 between the grid of described P type metal-oxide-semiconductor and source electrode, described first resistance R1, in order to discharge the gate charge of P type metal-oxide-semiconductor, protects described P type metal-oxide-semiconductor not breakdown impaired.Also be provided with bypass diode D between the drain electrode of described P type metal-oxide-semiconductor and source electrode, described diode D prevents overtension between the drain electrode of P type metal-oxide-semiconductor and source electrode from damaging P type metal-oxide-semiconductor.
The base stage of described triode Q is connected to the power signal line of described governor circuit, and collector electrode is connected to the grid of described P type metal-oxide-semiconductor, and grounded-emitter connection is arranged.The second resistance R2 is also provided with between the collector electrode of described triode Q and described P type metal-oxide-semiconductor.
In the present embodiment, described PWM blower fan working power VCC is 12V, R1=10K Ω, R2=50 Ω.When described PWM blower fan stops, governor circuit sends turn-off current signal I by power signal line
b1, triode Q is in amplification working state, at this moment PWM blower fan working power VCC is by R1 and R2 dividing potential drop, produce the grid that low level acts on P type metal-oxide-semiconductor, P type metal-oxide-semiconductor is ended, PWM blower fan working power VCC cannot be connected to drain electrode by the source electrode of P type metal-oxide-semiconductor, and PWM blower fan and PWM blower fan working power VCC disconnect.
During described PWM fan operation, governor circuit sends turn-on current signal I by power signal line
b2, triode Q is in cut-off working state, at this moment VCC passes through R1, produce the grid that high level acts on P type metal-oxide-semiconductor, make the conducting of P type metal-oxide-semiconductor, PWM blower fan working power VCC can be connected to drain electrode by the source electrode of P type metal-oxide-semiconductor, and power port 1, the PWM blower fan and the PWM blower fan working power VCC that then output to PWM blower fan connect.
Described pwm signal circuit comprises the 3rd resistance R3 and in the 4th resistance R4 be arranged in parallel and the first electric capacity C1.Described feeder loop comprises the 5th resistance R5 and the second electric capacity C2.Described first electric capacity C1 and the second electric capacity C2 is provided with grounding end, is suppressed the voltage functuation of described pwm signal circuit and feeder loop by the first electric capacity C1 and the second electric capacity C2, makes voltage become steadily smooth.
Described feeder loop also comprises the 6th resistance R6 and is connected to feeder loop stabilized power supply VCC ＇ by described 6th resistance R6.In the present embodiment, feeder loop stabilized power supply VCC ＇ is 5V DC electrical source.
The beneficial effects of the utility model are: adopt the utility model to be used for the PWM draught fan control circuit of refrigerator, when PWM blower fan is out of service, governor circuit sends open command by the power control switch of power supply circuits described in power supply signal alignment, effectively avoids the stand-by power consumption of PWM blower fan by this.On the other hand, the turn-off current signal I that sent by power signal line of governor circuit
b1 and turn-on current signal I
b2 operating currents being all less than PWM blower fan, effectively reduce the current load in governor circuit, thus protect governor circuit and corresponding electrical components better.
Be to be understood that, although this specification is described according to mode of execution, but not each mode of execution only comprises an independently technological scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, technological scheme in each mode of execution also through appropriately combined, can form other mode of executions that it will be appreciated by those skilled in the art that.
A series of detailed description listed is above only illustrating for feasibility mode of execution of the present utility model; they are also not used to limit protection domain of the present utility model, all do not depart from the utility model skill equivalent implementations of doing of spirit or change all should be included within protection domain of the present utility model.
Claims (8)
1. the PWM draught fan control circuit for refrigerator, described PWM blower fan has power port, pwm signal port, feedback port and grounding ports, it is characterized in that: described PWM draught fan control circuit comprises the power supply circuits and governor circuit that connect power port and PWM blower fan working power VCC, described power supply circuits comprise the power control switch controlling described power supply circuits break-make, described governor circuit comprises the pwm signal circuit being connected to pwm signal port, be connected to the feeder loop of feedback port and be connected to the power signal line of described power control switch.
2. PWM draught fan control circuit according to claim 1, it is characterized in that: described power control switch comprises P type metal-oxide-semiconductor, source electrode and the drain electrode of described P type metal-oxide-semiconductor are electrically connected to the power port of PWM blower fan working power VCC and PWM blower fan respectively, are provided with the first resistance R1 between the grid of described P type metal-oxide-semiconductor and source electrode.
3. PWM draught fan control circuit according to claim 2, is characterized in that: be also provided with bypass diode D between the drain electrode of described P type metal-oxide-semiconductor and source electrode.
4. PWM draught fan control circuit according to claim 2, it is characterized in that: described power control switch also comprises triode Q, the base stage of described triode Q is connected to the power signal line of described governor circuit, and collector electrode is connected to the grid of described P type metal-oxide-semiconductor, and grounded-emitter connection is arranged.
5. PWM draught fan control circuit according to claim 4, is characterized in that: be also provided with the second resistance R2 between the collector electrode of described triode Q and described P type metal-oxide-semiconductor.
6. PWM draught fan control circuit according to claim 1, is characterized in that: described pwm signal circuit comprises the 3rd resistance R3 and in the 4th resistance R4 be arranged in parallel and the first electric capacity C1.
7. PWM draught fan control circuit according to claim 1, is characterized in that: described feeder loop comprises the 5th resistance R5 and the second electric capacity C2.
8. PWM draught fan control circuit according to claim 7, is characterized in that: described feeder loop also comprises the 6th resistance R6 and is connected to feeder loop stabilized power supply VCC ＇ by described 6th resistance R6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520464475.6U CN204851729U (en) | 2015-06-30 | 2015-06-30 | A PWM fan control circuit for refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520464475.6U CN204851729U (en) | 2015-06-30 | 2015-06-30 | A PWM fan control circuit for refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204851729U true CN204851729U (en) | 2015-12-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520464475.6U Active CN204851729U (en) | 2015-06-30 | 2015-06-30 | A PWM fan control circuit for refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204851729U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929967A (en) * | 2015-06-30 | 2015-09-23 | 青岛海尔股份有限公司 | Control circuit and control method of PWM blower fan used for refrigerator |
-
2015
- 2015-06-30 CN CN201520464475.6U patent/CN204851729U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929967A (en) * | 2015-06-30 | 2015-09-23 | 青岛海尔股份有限公司 | Control circuit and control method of PWM blower fan used for refrigerator |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |