CN210898941U - Power supply conversion device for direct current electric fan, adapter and direct current electric fan - Google Patents
Power supply conversion device for direct current electric fan, adapter and direct current electric fan Download PDFInfo
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- CN210898941U CN210898941U CN201921451878.1U CN201921451878U CN210898941U CN 210898941 U CN210898941 U CN 210898941U CN 201921451878 U CN201921451878 U CN 201921451878U CN 210898941 U CN210898941 U CN 210898941U
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Abstract
The utility model relates to a fan control field discloses a power conversion equipment, power adapter and direct current fan for direct current fan. By providing a step-up device configured to step up and output an input direct-current voltage to power a motor of a direct-current fan and a power limiting device for controlling a reduced rotation speed of the motor to reduce an operation power of the motor in a case where an output voltage of the step-up device is detected in a power conversion apparatus in the power conversion apparatus. When the mobile power supply supplies power to the motor through the boosting equipment, the running power of the motor is controlled to be reduced, the running time of the motor can be effectively prolonged by the mobile power supply, so that the air supply requirement of a user is met, and the user experience is improved.
Description
Technical Field
The utility model relates to a fan control field specifically relates to a power conversion equipment, power adapter and direct current fan for direct current fan.
Background
The existing direct current electric fan generally performs direct current power supply through an external alternating current to direct current power adapter, or is externally connected with alternating current commercial power, and the direct current electric fan supplies power to a direct current motor after the direct current electric fan converts the direct current into the direct current through a circuit. In some application scenarios, the ac mains supply cannot be provided in time, such as far away from the ac mains supply socket or during mains supply power failure, thereby limiting the use of the dc fan. For solving this problem, appeared that accessible external portable power source supplies power to direct current fan after passing through boost circuit and stepping up to make direct current fan can continue work, but because portable power source's storage electric quantity is limited, direct current fan's power is high about 30W relatively, makes portable power source power consumptive too fast, can only provide the power supply fan operation of short-term, with this influence user experience.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a power conversion equipment, adapter and dc electric fan for dc electric fan in order to overcome the problem that power supply time is short when the external portable power source of dc electric fan that prior art exists supplies power.
In order to achieve the above object, the first aspect of the present invention provides a power conversion device for a dc electric fan, the power conversion device comprising:
a boosting device configured to boost and output an input direct current voltage to supply power to an operation of a motor of the direct current fan;
and the power limiting device is connected with the output end of the boosting device and is used for controlling the motor to reduce the rotating speed under the condition that the output voltage of the boosting device is detected.
Preferably, the power limiting device comprises:
the voltage sampling circuit is used for detecting the output voltage of the boosting equipment;
the motor driving circuit is used for driving the motor to operate;
a controller, comprising:
the voltage detection end is connected with the output end of the voltage sampling circuit;
the motor control end is connected with the input end of the motor driving circuit;
the controller is used for controlling the motor to reduce the rotating speed according to the output voltage under the condition of determining the output voltage of the boosting device.
Preferably, the boosting apparatus includes:
a booster circuit for boosting an input direct-current voltage;
and the input end of the protection circuit is connected with the output end of the booster circuit and is used for carrying out overcurrent protection on the output of the booster circuit.
Preferably, the booster circuit includes:
the switch control unit comprises a first control end and a second control end and is used for respectively outputting two paths of PWM switching signals;
the first end of the first capacitor is the input end of the booster circuit;
one end of the first inductor is connected with the first end of the first capacitor;
the control end of the first switch is connected with the first control end, the output end of the first switch is grounded, and the input end of the first switch is connected with the second end of the first inductor;
the input end of the second switch is connected with the input end of the first switch, the control end of the second switch is connected with the second control end, and the output end of the second switch is the output end of the booster circuit;
and the first end of the second capacitor is connected with the output end of the second switch.
Preferably, the switch control unit further comprises a third control terminal;
the protection circuit comprises a third switch, the control end of the third switch is connected with the third control end, the input end of the third switch is the input end of the protection circuit, and the output end of the third switch is the output end of the protection circuit.
Preferably, the switch control unit further comprises a voltage sampling input;
the protection circuit further comprises a voltage sampling unit;
the input end of the voltage sampling unit is connected with the output end of the third switch, and the output end of the voltage sampling unit is connected with the voltage sampling input end.
Preferably, the switch control unit, the first switch and the second switch are integrated within a chip.
The utility model discloses the second aspect provides a DC power supply adapter for direct current fan, and DC power supply adapter includes:
the switch control unit comprises a first control end, a second control end and a third control end, wherein the first control end and the second control end are used for respectively outputting two paths of PWM switching signals;
the first end of the first capacitor is the input end of the direct-current power adapter;
one end of the first inductor is connected with the first end of the first capacitor;
the control end of the first switch is connected with the first control end, the output end of the first switch is grounded, and the input end of the first switch is connected with the second end of the first inductor;
the input end of the second switch is connected with the input end of the first switch, and the control end of the second switch is connected with the second control end;
the first end of the second capacitor is connected with the output end of the second switch;
the input end of the third switch is connected with the input end of the second switch, and the output end of the third switch is the output end of the direct-current power adapter; and the control end of the third switch is connected with the third control end.
A third aspect of the present invention provides a dc electric fan, including the above power conversion apparatus.
Preferably, the power conversion device is arranged in a casing of the dc electric fan, and an input end of the power conversion device is connected to a dc input port arranged in the casing to access an external dc mobile power supply.
Preferably, the dc input port is a USB interface or a TYPEC interface.
The utility model discloses a fourth aspect provides a dc electric fan, and this dc electric fan includes foretell power adapter.
Through the technical scheme, the utility model discloses a power conversion equipment for direct current electric fan through set up step-up equipment and power limiting equipment in power conversion equipment, wherein step-up equipment is configured to step up the direct current voltage of input and export to supplying power to direct current electric fan's motor, power limiting equipment is used for under the output voltage's that detects step-up equipment the reduction rotational speed of control motor, with the operating power who reduces the motor. When the mobile power supply supplies power to the motor through the boosting equipment, the running power of the motor is controlled to be reduced, the running time of the motor can be effectively prolonged by the mobile power supply, so that the air supply requirement of a user is met, and the user experience is improved.
Drawings
Fig. 1 schematically shows a circuit block diagram of a power conversion device of the present invention;
fig. 2 schematically shows another circuit schematic diagram of the voltage boosting device in the power conversion apparatus of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict.
In the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, bottom" and "upper" are generally used with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, vertical or gravitational direction.
The utility model discloses embodiment first aspect provides a power conversion equipment for direct current electric fan, and direct current electric fan here indicates that the motor is brushless direct current motor (BLDC), mainly supplies power through motor drive circuit 60 based on inverter circuit to the driving motor operation specifically inputs control signal through motor drive circuit 60, and realization that can be convenient carries out the regulation of rotational speed to the motor, in order to realize electrodeless speed governing.
The power conversion device includes the motor driving circuit 60 described above, thereby driving the motor to operate. Fig. 1 schematically shows a circuit block diagram of the power conversion apparatus, in which the voltage conversion apparatus includes a voltage boosting device 100 and a power limiting device 200.
Wherein the boosting apparatus 100 is configured to boost and output an input direct-current voltage to power a motor of the direct-current fan; the direct current input by the voltage boosting device 100 is direct current with relatively low voltage, the voltage output by a mobile power supply such as a charger baby which is easily used by a user in life is generally 5V, and the voltage is used for charging the mobile equipment such as a mobile phone, and the driving circuit of the brushless direct current motor for the electric fan generally has working voltage of more than ten volts to twenty volts, such as 12V-26V, and rated power of about 30W, so that in order to utilize the direct current output by the charger baby, the voltage boosting device 100 is required to boost the voltage so as to supply power to the motor driving circuit 60 to enable the motor driving circuit to normally drive the motor to operate.
And the power limiting device 200 is connected with the output end of the voltage boosting device 100 and is used for controlling the rotating speed reduction of the motor to reduce the running power of the motor under the condition that the output voltage of the voltage boosting device 100 is detected.
When the electric fan is used at ordinary times, direct current with relatively high voltage is generally accessed through an alternating current power adapter to drive the motor to run by the motor driving circuit 60, or the circuit of the alternating current power adapter is arranged inside the electric fan, so that external alternating current is converted into direct current with relatively high voltage. When the power is supplied by the ac power adapter, the problem of power consumption is not considered, but when the power is supplied by the external low-voltage dc boosted by the voltage boosting device 100, the power stored by the external portable power source is limited, for example, the general charger is 5000 + 10000mAH (milliampere hours), if the motor driving board is powered and the motor is controlled to operate according to the normal rated power, the current of the motor driving board can reach more than 2A, therefore, the electric quantity provided by the charger can only theoretically supply power for the motor to operate for a short time, for example, when the battery supplies power with 10000maH, the voltage is increased from 5V to 16V through the voltage boosting device 100, without considering the conversion efficiency at the time of boosting by the booster device 100, the motor operates at a rated power with an operating current close to 2A, the power supply of the charger can only keep the motor running for 10 minutes theoretically, so that the air supply requirement of a user is greatly limited.
After the power limiting circuit detects that the output voltage of the boosting device 100 supplies power, the rotating speed of the motor is controlled to be reduced, so that the running power of the motor is reduced, if the running power of the motor is reduced to half of the rated power, such as 15W, the running time of the motor is doubled to reach about half an hour, and therefore the air supply time requirement of a user can be basically met temporarily, and the user experience is improved.
As shown in fig. 1, in a preferred embodiment of the present invention, the power limiting apparatus 200 includes:
the voltage sampling circuit 70 is used for detecting the output voltage of the voltage boosting device 100. The voltage sampling circuit 70 can be implemented based on the existing resistor-voltage-dividing circuit, and is not described in detail herein.
And the motor driving circuit 60 is used for driving the motor to operate. The motor driving circuit 60 may be an inverter circuit to invert the input dc power into ac power with controllable frequency under the action of the motor driving signal input from the controller 80, so as to drive the motor to operate. The rotating speed of the motor can be changed according to a motor driving signal, and stepless speed regulation is realized.
A controller 80 (i.e., MCU in fig. 1), comprising:
a voltage detection terminal connected to the output terminal of the voltage sampling circuit 70;
a motor control terminal connected to an input terminal of the motor driving circuit 60;
the controller 80 is configured to control the motor to reduce the rotation speed according to the output voltage in the case where the output voltage of the voltage boosting apparatus 100 is determined.
In this embodiment, the controller 80 can recognize whether the voltage boosting device 100 outputs a voltage or not according to the output voltage of the voltage boosting device 100 acquired from the voltage sampling circuit 70 and the difference in the output voltage. When the electric fan is used at ordinary times, the power limiting apparatus 200 is supplied with dc power through an ac adaptor as shown in fig. 1, which may be a switching power supply inside to convert the input ac power into dc power having a voltage higher than the voltage output from the voltage boosting apparatus 100, e.g., the voltage output from the ac adaptor may reach 24V, thereby maintaining the dc power fan capable of operating at a rated power. And the voltage output by the voltage boosting device 100 is only 16V, at this time, the controller 80 outputs a control command to the motor driving circuit 60 by recognizing whether the voltage boosting device 100 outputs the voltage or not, when determining the output voltage of the voltage boosting device 100, so that the rotation speed of the motor is reduced, thereby realizing the reduction of the power of the motor.
As shown in fig. 1, in a preferred embodiment of the present invention, the boosting apparatus 100 includes:
a booster circuit 110 for boosting an input dc voltage;
and the input end of the protection circuit 40 is connected with the output end of the booster circuit 110, and is used for performing overcurrent protection on the output of the booster circuit 110.
The Boost circuit 110 may be a Boost circuit, and in a preferred embodiment, as shown in fig. 1, the Boost circuit 110 specifically includes:
the switching control unit 30 includes a first control terminal and a second control terminal, and is configured to output two paths of PWM switching signals respectively;
a first capacitor C1, wherein a first end of the first capacitor C1 is an input end of the voltage boost circuit 110;
one end of a first inductor L1 is connected with a first end of a first capacitor C1, and one end of the first inductor L1 is connected with a second end of the first capacitor C1;
a first switch 20, wherein a control terminal of the first switch 20 is connected to the first control terminal, an output terminal of the first switch 20 is grounded, and an input terminal of the first switch 20 is connected to the second terminal of the first inductor L1;
the input end of the second switch 10 is connected to the input end of the first switch 20, the control end of the second switch 10 is connected to the second control end, and the output end of the second switch 10 is the output end of the boost circuit 110;
and a first end of a second capacitor C2 and a first end of a second capacitor C2 are connected with the output end of the second switch 10.
The switch control unit 30 is the PWM controller in fig. 1, which may be a dedicated switch control chip or a general-purpose microprocessor such as a single chip, and the output switch signal controls the first switch 20 and the second switch 10 to alternately switch, when the first switch 20 is turned on, the input dc power is sent to ground through the first inductor L1L1 and the first switch 20, so as to store the induced electromotive force in the first inductor L1, and when the first switch 20 is turned off and the second switch 10 is turned on, the induced electromotive force stored in the first inductor L1L1 charges the second capacitor C2 through the second switch 10. The first switch 20 and the second switch 10 are controlled continuously to alternately act, so that the continuous energy storage and release of the first inductor L1L1 are realized, and the boosting function is realized, so that the voltage on the second capacitor C2 at the output end is higher than the voltage on the first capacitor C1 at the input end.
Further, as shown in fig. 1, in a preferred embodiment of the present invention, the switch control unit 30 further includes a third control end;
in this case, the protection circuit 40 includes a third switch 40, a control terminal of the third switch 40 is connected to a third control terminal, an input terminal of the third switch 40 is an input terminal of the protection circuit 40, and an output terminal of the third switch 40 is an output terminal of the protection circuit 40.
In this embodiment, the boosted voltage output portion is outputted through the third switch 40 in the voltage boosting circuit 110. The third switch 40 can protect the output of the boost circuit 110, for example, when the output current of the boost circuit 110 is too large, the third switch 40 can be controlled to be turned off, so as to protect the boost circuit 110 from overcurrent damage. At this time, a current detection circuit (not shown in the figure) may be added inside the boost circuit 110, for example, the current detection circuit may be a detection circuit based on a resistor, the magnitude of the output current is identified by detecting the magnitude of the voltage across the resistor, and when the switch control unit 30 determines that the voltage is too large to exceed a preset threshold, the third switch 40 is controlled to be turned off, so as to implement the over-current protection.
Further, as shown in fig. 1, the switch control unit 30 further includes a voltage sampling input terminal;
the protection circuit 40 further includes a voltage sampling unit 90, where the voltage sampling unit 90 can be implemented by using an existing resistance voltage division type sampling circuit, and is not described herein again.
The input end of the voltage sampling unit 90 is connected to the output end of the third switch 40, and the output end of the voltage sampling unit 90 is connected to the voltage sampling input end.
In this embodiment, the protection circuit 40 further includes a voltage sampling circuit 70 to sample the voltage at the output terminal of the voltage boost circuit 110, and the switch control unit 30 controls the third switch 40 to be turned off when determining that the output voltage is abnormal, so as to further protect the voltage boost circuit 110. Meanwhile, the switch control unit 30 may also control the switching states of the first switch 20 and the third switch 40 according to the output voltage as a reference, so that the output voltage of the boost circuit 110 is maintained in a stable state of a preset voltage, thereby implementing the purpose of providing a stable power supply voltage to the load.
The first switch 20, the second switch 10, and the third switch 40 may employ one of an electronic switching device such as a transistor, a MOS transistor, and a thyristor, or a mechanical switching type controllable device such as a relay. As a preferred implementation, the switch described above uses MOS transistors.
As shown in fig. 1, the first switch 20 includes a first NMOS transistor Q1, a gate of the first NMOS transistor Q1 is a control terminal of the first switch 20, a source of the first NMOS transistor Q1 is an output terminal of the first switch 20, and a drain of the first NMOS transistor Q1 is an input terminal of the first switch 20;
the second switch 10 includes a second NMOS transistor Q2, a gate of the second NMOS transistor Q2 is a control terminal of the second switch 10, a source of the second NMOS transistor Q2 is an output terminal of the second switch 10, and a drain of the second NMOS transistor Q2 is an input terminal of the second switch 10.
The third switch 40 includes a PMOS transistor Q3, a gate of the PMOS transistor Q3 is a control terminal of the third switch 40, a source of the PMOS transistor Q3 is an input terminal of the third switch 40, and a drain of the PMOS transistor Q3 is an output terminal of the third switch 40.
The present invention provides a preferred embodiment, which can consider the integration of some control circuits of the above-mentioned boosting device 100, so as to realize the miniaturization of the circuit of the boosting device 100, and conveniently reduce the volume of the circuit board, and facilitate the installation.
Fig. 2 schematically shows another circuit schematic of the voltage boosting device 100 in the power conversion apparatus. As shown in fig. 2, in this circuit, the switch control unit 30, the first switch 20 and the second switch 10 are integrated within a chip. The circuit of the unit is integrated by a special DC-DC (direct current-direct current) chip U1, the circuit comprises a switching device and a control part of a BOOST circuit part, and the chip U1 forms the circuit together by connecting peripheral circuits such as resistors or capacitors connected with each pin of the chip U1, so that the volume of the circuit board of the BOOST device 100 can be effectively reduced, and the installation is convenient.
The utility model discloses embodiment mode second aspect provides a DC power adapter for direct current fan, as shown in FIG. 1, this DC power adapter includes:
the switching control unit 30 includes first to third control terminals, wherein the first control terminal and the second control terminal are used for outputting two paths of PWM switching signals, respectively;
a first capacitor C1, wherein a first end of the first capacitor C1 is an input end of the direct-current power adapter;
one end of a first inductor L1 is connected with a first end of a first capacitor C1, and one end of the first inductor L1 is connected with a second end of the first capacitor C1;
a first switch 20, wherein a control terminal of the first switch 20 is connected to the first control terminal, an output terminal of the first switch 20 is grounded, and an input terminal of the first switch 20 is connected to the second terminal of the first inductor L1;
the input end of the second switch 10 is connected with the input end of the first switch 20, and the control end of the second switch 10 is connected with the second control end;
a first end of the second capacitor C2, a first end of the second capacitor C2 is connected to the output end of the second switch 10;
the input end of the third switch 40 is connected with the input end of the second switch 10, and the output end of the third switch 40 is the output end of the direct-current power adapter; a control terminal of the third switch 40 is connected to the third control terminal.
The switch control unit 30, the first capacitor C1, the first inductor L1, the first switch 20, the second switch 10 and the second capacitor C2 form a Boost basic circuit, so that the input low direct-current voltage is boosted to high direct-current voltage, and the third switch 40 protects the output after boosting to avoid overcurrent damage.
The direct current power adapter can boost direct current with lower voltage into direct current with higher voltage, so that power can be supplied to the electric equipment. If the motor of the direct current fan is powered, the mobile power supply with lower voltage is provided, such as a charger, the output voltage of the mobile power supply is boosted by the direct current power supply adapter and then can be used for supplying power to the direct current fan, and therefore the operation of the direct current fan can be maintained by the power supply provided by the mobile power supply. Under the condition that the direct current fan is inconvenient to access the alternating current, the direct current fan can still continue to work through the power supply energy of the mobile power supply, and therefore the use of a user is facilitated.
A third aspect of the present invention provides a dc electric fan including the above dc power adapter. This direct current fan is except including external alternating current power adapter, still includes external foretell direct current power adapter simultaneously to this can insert portable power source like the treasured that charges through direct current power adapter, when conveniently causing alternating current power adapter to be unable to use in the place that can't insert the alternating current, still can make direct current fan work after inserting portable power source through direct current power adapter, made things convenient for user's use.
The fourth aspect of the present invention provides a dc electric fan, which includes the above power conversion device for a dc electric fan. Compared with the direct current fan, the power conversion device is arranged in the direct current fan, such as the direct current fan is arranged in a shell of the direct current fan, and the power conversion device is different from the external arrangement of the alternating current adapter, so that a user can conveniently and directly access the mobile power supply.
Specifically, the utility model discloses an among the preferred embodiment, power conversion device sets up in direct current electric fan's casing, be provided with direct current input port on the casing, power conversion device's input and direct current input port electricity are connected, this direct current input port can be common power input port like USB interface (including Micro USB interface) or TYPEC interface, with this precious access of conveniently charging, if charge precious USB interface of connecting through the USB power cord, thereby for power conversion device provides the low voltage direct current, and step up to the operation power supply of the motor of direct current electric fan behind the higher direct current through power conversion device.
Because with power conversion device setting and in the direct current electric fan to be provided with direct current input port on the casing, can make things convenient for precious direct access to the operation power supply of direct current fan that charges, thereby convenience of customers' use more.
The above is merely a preferred embodiment of the present invention, and not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features.
In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.
Claims (10)
1. A power conversion device for a dc electric fan, the power conversion device comprising:
a boosting device configured to boost and output an input direct-current voltage to power operation of a motor of the direct-current electric fan;
and the power limiting device is connected with the output end of the boosting device and is used for controlling the motor to reduce the rotating speed under the condition of detecting the output voltage of the boosting device.
2. The power conversion apparatus of claim 1, wherein the power limiting device comprises:
the voltage sampling circuit is used for detecting the output voltage of the boosting equipment;
the motor driving circuit is used for driving the motor to operate;
a controller, comprising:
the voltage detection end is connected with the output end of the voltage sampling circuit;
the motor control end is connected with the input end of the motor driving circuit;
the controller is used for controlling the motor to reduce the rotating speed according to the output voltage under the condition of determining the output voltage of the boosting device.
3. The power conversion apparatus according to claim 1, wherein the step-up device comprises:
a booster circuit for boosting an input direct-current voltage;
and the input end of the protection circuit is connected with the output end of the booster circuit and is used for carrying out overcurrent protection on the output of the booster circuit.
4. The power conversion apparatus according to claim 3, wherein the booster circuit comprises:
the switch control unit comprises a first control end and a second control end and is used for respectively outputting two paths of PWM switching signals;
a first end of the first capacitor is an input end of the booster circuit;
one end of the first inductor is connected with the first end of the first capacitor;
a control end of the first switch is connected with the first control end, an output end of the first switch is grounded, and an input end of the first switch is connected with a second end of the first inductor;
the input end of the second switch is connected with the input end of the first switch, the control end of the second switch is connected with the second control end, and the output end of the second switch is the output end of the booster circuit;
and the first end of the second capacitor is connected with the output end of the second switch.
5. The power conversion device of claim 4, wherein the switch control unit further comprises a third control terminal;
the protection circuit comprises a third switch, wherein the control end of the third switch is connected with the third control end, the input end of the third switch is the input end of the protection circuit, and the output end of the third switch is the output end of the protection circuit.
6. The power conversion device of claim 5, wherein the switch control unit further comprises a voltage sampling input;
the protection circuit further comprises a voltage sampling unit;
the input end of the voltage sampling unit is connected with the output end of the third switch, and the output end of the voltage sampling unit is connected with the voltage sampling input end.
7. The power conversion device according to any one of claims 4 to 6, wherein the switch control unit, the first switch, and the second switch are integrated in a chip.
8. A dc electric fan comprising the power conversion device according to any one of claims 1 to 7.
9. The direct-current electric fan according to claim 8, wherein the power conversion device is disposed in a housing of the direct-current electric fan, and an input end of the power conversion device is connected to a direct-current input port disposed in the housing to access an external direct-current mobile power supply.
10. The dc fan of claim 9, wherein the dc input port is a USB interface or a TYPEC interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921451878.1U CN210898941U (en) | 2019-08-30 | 2019-08-30 | Power supply conversion device for direct current electric fan, adapter and direct current electric fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921451878.1U CN210898941U (en) | 2019-08-30 | 2019-08-30 | Power supply conversion device for direct current electric fan, adapter and direct current electric fan |
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| Publication Number | Publication Date |
|---|---|
| CN210898941U true CN210898941U (en) | 2020-06-30 |
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| CN201921451878.1U Active CN210898941U (en) | 2019-08-30 | 2019-08-30 | Power supply conversion device for direct current electric fan, adapter and direct current electric fan |
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| CN (1) | CN210898941U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117353284A (en) * | 2023-09-22 | 2024-01-05 | 东莞市柏群电子科技有限公司 | Generator low-speed power supply method and system based on exercise bike |
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2019
- 2019-08-30 CN CN201921451878.1U patent/CN210898941U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117353284A (en) * | 2023-09-22 | 2024-01-05 | 东莞市柏群电子科技有限公司 | Generator low-speed power supply method and system based on exercise bike |
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