CN1592020A - Over voltage protecting circuit for dc brushless fan motor - Google Patents
Over voltage protecting circuit for dc brushless fan motor Download PDFInfo
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- CN1592020A CN1592020A CN 03156529 CN03156529A CN1592020A CN 1592020 A CN1592020 A CN 1592020A CN 03156529 CN03156529 CN 03156529 CN 03156529 A CN03156529 A CN 03156529A CN 1592020 A CN1592020 A CN 1592020A
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- power supply
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Abstract
A DC brushless fan motor over-voltage protection circuit includes an over-voltage protection element, a first resistor, a second resistor, a first transistor and a second transistor. The said element is set between the supply and a motor driving circuit and connected between the supply and the ground to discharge its over-voltage to the earth. The first resistor provides a voltage to the second transistor to control its conduction, the first transistor is connected to the second to form a switch group connected between the element and the motor driving circuit to resist the overvoltage of the supply. The second resistor provides a voltage to the first transistor. When the supply generates an over-voltage, the protection element conducts the second transistor to connect to the earth and let the first one not conduct to break the driving circuit.
Description
Technical field
The present invention relates to a kind of excess voltage protection, particularly a kind of excess voltage protection of brush DC fan motor.
Background technology
As No. 91220027 [current-limiting circuit of DC Brushless Motor] novel patent of Taiwan patent application, this current-limiting circuit comprises a first transistor, a transistor seconds, one first resistor and one second resistor.This first transistor and first resistor and this transistor seconds and the second resistor complementation are connected to form this current-limiting circuit, and this current-limiting circuit has the two point end and is connected to a power supply and a motor drive circuit.
When sharply rising, this power source voltage make this first resistor terminal voltage raise, so that this first switch conduction, and the terminal voltage of this second resistor is descended, and form closing of this second switch, this motor drive circuit is formed open circuit.Mat constantly repeats alternately start this first switch and second switch, till the electric current and voltage recovery normally of this power supply.
This current-limiting circuit be when fan running unusually maybe can't turn round by this, its effectively current limliting to avoid taking place a large amount of consumed powers and high temperature.
Yet when this power source voltage generation overvoltage, the structure of this current-limiting circuit is not useful in the protection overvoltage purposes of this brush DC fan motor.Promptly the structure of this current-limiting circuit does not have overvoltage protection element, so the overvoltage that this current-limiting circuit can't this power supply of accurate response.
In brief, when this power supply generation overvoltage, it need effectively protect overvoltage element, imports this brush DC fan motor to avoid overvoltage.
In view of this, the present invention improves above-mentioned shortcoming, utilizes an overvoltage protection element to be connected in a motor drive circuit one direct current brushless fan motor, imports this motor drive circuit to prevent overvoltage.
Summary of the invention
Main purpose of the present invention provides a kind of excess voltage protection of brush DC fan motor; its excess voltage protection that will have simple circuit structure is connected in a motor drive circuit; with the effect of avoiding this motor drive circuit destroyed by overvoltage, the present invention is had increasing the service life.
Secondary objective of the present invention provides a kind of excess voltage protection of brush DC fan motor, and it adopts the overvoltage protection element with simple circuit structure, makes the present invention have the effect of simplified construction.
Above-mentioned purpose of the present invention is realized by following technical scheme.
A kind of excess voltage protection of brush DC fan motor is characterized in that comprising:
One overvoltage protection element, it is located between a power supply and the fan motor drive circuit, and is connected in simultaneously between this power supply and the ground connection, and this overvoltage protection element is in order to the overvoltage of this power supply of releasing;
One first resistor, it is connected in series to this overvoltage protection element, and this first resistor is in order to provide one first voltage:
One the first transistor, it is connected between this power supply and the fan motor drive circuit, and this first transistor has a base stage;
One transistor seconds, it is connected to the base stage of this first transistor, and to form a switches set, this transistor seconds has a base stage and is connected to this first resistor, by the conducting and the not conducting of first this transistor seconds of voltage control of this first resistor; And
One second resistor, it is connected in this power supply and this first transistor, and this second resistor is in order to providing the base stage of one second voltage to this first transistor, by the conducting and the not conducting of second this first transistor of voltage control of this second resistor;
When this power source voltage just often, this not start of overvoltage protection element, first voltage of this first resistor can not make this transistor seconds conducting simultaneously, and this first transistor of second voltage turn-on of this second resistor, is supplied to this motor drive circuit to allow this power source voltage;
When this power supply produces overvoltage; this overvoltage protection element forms short circuit; overvoltage with this power supply of releasing; first voltage of this first resistor makes this transistor seconds conducting simultaneously; to allow this power supply to form ground connection via this transistor seconds; and second voltage of this second resistor no longer makes this first transistor conducting, continues to be supplied to this motor drive circuit to prevent this power source voltage.
The excess voltage protection of described brush DC fan motor is characterized in that: this over-current protecting element is a Zener diode
The excess voltage protection of described brush DC fan motor is characterized in that: this transistor seconds is the pnp transistor.
The excess voltage protection of described brush DC fan motor is characterized in that: this transistor seconds is the npn transistor.
The excess voltage protection of described brush DC fan motor; it is characterized in that: form one first common ground between this overvoltage protection element and first resistor; this first common ground is connected to the base stage of this transistor seconds, and the base stage of this first voltage to this transistor seconds is provided by this.
The excess voltage protection of described brush DC fan motor; it is characterized in that: form one second common ground between the base stage of this first transistor and the transistor seconds; this second common ground is connected to this second resistor, and the base stage of this second voltage to this first transistor is provided by this.
According to the excess voltage protection of brush DC fan motor of the present invention, this circuit comprises an overvoltage protection element, one first resistor, one second resistor, a first transistor and a transistor seconds.This overvoltage protection element is to be located between this power supply and the motor drive circuit, and it is connected between this power supply and the ground connection, so that the overvoltage of this power supply of releasing.This first resistor and provide a voltage to this transistor seconds is to control its conducting and not conducting.This first transistor is connected to this transistor seconds forming a switches set, and the switches set that this first transistor and transistor seconds form is connected between this overvoltage protection element and the fan motor drive circuit, so that block the overvoltage of this power supply.This second resistor is then in order to provide a voltage to this first transistor, to control its conducting and not conducting.When this power supply produced overvoltage, this overvoltage protection element will impel this transistor seconds conducting so that the direct ground connection of the overvoltage of this power supply, and makes this first transistor form not conducting, and this fan motor drive circuit was formed open circuit.
The invention has the advantages that:
The present invention adopts the overvoltage protection element with simple circuit structure to reach and avoids motor drive circuit destroyed by overvoltage, have the effect that increases the service life.
In order to allow above-mentioned and other purposes of the present invention, feature and advantage understand by clearer and more definite quilt, hereinafter will be especially exemplified by preferred embodiment of the present invention, and conjunction with figs., be described in detail below.
Description of drawings
Fig. 1: the circuit diagram of the excess voltage protection of the present invention's first preferred embodiment brush DC fan motor.
Fig. 2: the circuit diagram of the excess voltage protection of the present invention's second preferred embodiment brush DC fan motor.
Embodiment
Fig. 1 discloses the circuit diagram of the excess voltage protection of the present invention's first preferred embodiment brush DC fan motor.
Please refer to shown in Figure 1ly, the excess voltage protection 10 of the brush DC fan motor of the present invention's first preferred embodiment is to be located between power supply (Vcc) 1 and the fan motor drive circuit 2.This excess voltage protection 10 comprises an overvoltage protection element 11, one first resistor 12, one second resistor 13, a first transistor 14 and a transistor seconds 15.
Referring again to shown in Figure 1, this overvoltage protection element 11 and first resistor 12 form serial connection on a common ground a, and are connected between this power supply 1 and the ground connection, so that the overvoltage of this power supply 1 of releasing.This overvoltage protection element 11 is to belong to a Zener diode (Zener diode).Therefore this power supply 1 can form ground connection via this overvoltage protection element 11 and first resistor 12.12 of this first resistors are in order to provide a voltage Va.When this overvoltage protection element 11 punctured the formation short circuit, this first resistor 12 had current flowing, thereby it produces a voltage Va on this common ground a.
In addition, this first transistor 14 is connected to this transistor seconds 15 to form a switches set, and this first transistor 14 has a base stage and is connected to this transistor seconds 15.15 of this transistor secondses belong to the pnp transistor; it has the base stage that an emitter-base bandgap grading connects this first transistor 14; it has a base stage in addition and is connected to this common ground a; so this overvoltage protection element 11 and first resistor 12 can be controlled the voltage Va of the base stage of this transistor seconds 15, to finish its conducting of control and not conducting.The voltage Vb of the base stage of this first transistor 14 is controlled in the conducting of this transistor seconds 15 of mat and not conducting again, to finish its conducting of control and not conducting.The switches set of this first transistor 14 and transistor seconds 15 is connected between the serial connection combination and motor drive circuit 2 of this overvoltage protection element 11 and first resistor 12, so that block the overvoltage of this power supply 1.13 of this second resistors be connected in this power supply 1 and the common ground b that forms by the emitter-base bandgap grading of the base stage of this first transistor 14 and transistor seconds 15 between: this second resistor 13 is in order to provide a voltage Vb base stage to this first transistor 14, the voltage Vb of this second resistor 13 of mat controls the base stage of this first transistor 14, to finish its conducting of control and not conducting.By this, allow the voltage of this power supply 1 to input to this motor drive circuit 2; Or the voltage that cuts off this power supply 1 inputs to this motor drive circuit 2, the path ground that this moment, this power supply 1 can form through this second resistor 13 and transistor seconds 15.
Referring again to shown in Figure 1, when the voltage vcc of this power supply 1 is kept just often, this power supply 1 is not enough so that this overvoltage protection element 11 forms ground connection at the voltage Va that this first resistor 12 forms.This moment, the voltage Va of this first resistor 12 kept high potential.So, this first resistor 12 can't provide the base stage of this transistor seconds 15 of low-voltage conducting, thereby these transistor seconds 15 not conductings.At this moment, this power supply 1 is kept high potential at the voltage Vb that this second resistor 13 forms, thereby the base stage of this first transistor 14 of this voltage Vb conducting, is supplied to this fan motor drive circuit 2 with the voltage vcc that allows this power supply 1.
When this power supply 1 produced overvoltage, the voltage of this power supply 1 rose rapidly.In case the voltage that this power supply 1 provides rapid rising is during greater than the puncture voltage of this overvoltage protection element 11, this overvoltage protection element 11 forms ground connection.Simultaneously, conducting has electric current on this first resistor 12, thereby this first resistor 12 can provide voltage Va to form the base stage of electronegative potential to this transistor seconds 15, makes the base stage conducting of this transistor seconds 15.When these transistor seconds 15 conductings, the electric current of this power supply 1 is by this second resistor 13, make the voltage Vb of this second resistor 13 form electronegative potential, end because of this low-potential voltage Vb forms this first transistor 14, continue to be supplied to this fan motor drive circuit 2 to prevent this power supply 1 voltage vcc that sharply rises.
When this power supply 1 was got rid of overvoltage, the voltage of this power supply 1 descended gradually.In case when the voltage vcc of this power supply 1 was lower than the puncture voltage of this overvoltage protection element 11, this overvoltage protection element 11 formed and opens circuit.Simultaneously, the voltage Va of this first resistor 12 forms high potential and provides to the base stage of this transistor seconds 15, makes this transistor seconds 15 form not conducting.When these transistor seconds 15 not conductings, the voltage Vb of this second resistor 13 forms high potential, thereby this voltage Vb makes this first transistor 14 conductings, therefore can allow the voltage vcc of this power supply 1 to be supplied to this fan motor drive circuit 2 again.
Fig. 2 discloses the circuit diagram of the excess voltage protection of the present invention's second preferred embodiment brush DC fan motor.
Please refer to shown in Figure 2; the corresponding first preferred embodiment current-limiting circuit element that is arranged at of the excess voltage protection element of the present invention's second preferred embodiment; thereby adopt same icon to indicate at the element same section, to be convenient to understand difference between all preferred embodiments of the present invention.The part technology contents of second preferred embodiment is then incorporated reference in this if be disclosed in Fig. 1 or its explanation, will not give unnecessary details in detail again.
Referring again to shown in Figure 2, the excess voltage protection 10 of the brush DC fan motor of second preferred embodiment is connected in this power supply (Vcc) 1 and fan motor drive circuit 2.This excess voltage protection 10 comprises an overvoltage protection element 11, one first resistor 12, one second resistor 13, a first transistor 14 and a transistor seconds 15 '.
With respect to first preferred embodiment, the transistor seconds 15 ' of second preferred embodiment is to belong to the npn transistor.This overvoltage protection element 11 and first resistor 12 are serially connected with between power supply and the ground, and its series connection contact connects the base stage of transistor seconds 15 ', with the voltage Va of the base stage that controls this transistor seconds 15 ', to reach its conducting of control and not conducting.
Referring again to shown in Figure 2.When the voltage vcc of this power supply 1 is kept just often, the voltage vcc of this power supply 1 is not enough to form short circuits so that this overvoltage protection element 11 punctures.At this moment, this first resistor 12 can't provide a high voltage to make this transistor seconds 15 ' conducting, thereby this transistor seconds 15 ' not conducting.At this moment, this power supply 1 is kept a high potential at the voltage Vb that this second resistor 13 forms, thereby this voltage Vb can make this first transistor 14 conductings, is supplied to this fan motor drive circuit 2 with the voltage vcc that allows this power supply 1.
When this power supply 1 produced overvoltage, the voltage of this power supply 1 rose rapidly.In case when this power supply 1 provided puncture voltage greater than this overvoltage protection element 11 of the voltage of sharply going up up voltage, this overvoltage protection element 11 formed short circuits.Simultaneously, can conducting on this first resistor 12 electric current, thereby this first resistor 12 can provide voltage Va to form the base stage of a high potential to this transistor seconds 15 ', makes this transistor seconds 15 ' form conducting.When this transistor seconds 15 ' conducting, the electric current of this power supply 1 is by this second resistor 13, and the voltage Vb of this second resistor 13 forms electronegative potential, thereby this voltage Vb no longer makes this first transistor 14 conductings, and can prevent that this power supply 1 overvoltage Vcc that sharply rises from continuing to be supplied to this motor drive circuit 2.
When this power supply 1 was got rid of overvoltage, the voltage of this power supply 1 descended gradually.In case when the voltage vcc of this power supply 1 was lower than the puncture voltage of this overvoltage protection element 11, this overvoltage protection element 11 formed and opens circuit.Simultaneously, the voltage Va of this first resistor 12 forms electronegative potential and base stage to this transistor seconds 15 ' is provided, and makes this transistor seconds 15 ' not conducting.When this transistor seconds 15 ' not conducting, the electric current of this power supply 1 can't pass through this second resistor 13, and the voltage Vb of this second resistor 13 forms high potential, thereby this voltage Vb makes this first transistor 14 conductings, therefore can allow the voltage vcc of this power supply 1 to be supplied to this fan motor drive circuit 2 again.
Though the present invention discloses with aforementioned preferred embodiment, so it is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; When can doing various changes and modification, so protection scope of the present invention defines and is as the criterion when looking the claim scope.
Claims (6)
1, a kind of excess voltage protection of brush DC fan motor is characterized in that comprising:
One overvoltage protection element, it is located between a power supply and the fan motor drive circuit, and is connected in simultaneously between this power supply and the ground connection, and this overvoltage protection element is in order to the overvoltage of this power supply of releasing;
One first resistor, it is connected in series to this overvoltage protection element, and this first resistor is in order to provide one first voltage:
One the first transistor, it is connected between this power supply and the fan motor drive circuit, and this first transistor has a base stage;
One transistor seconds, it is connected to the base stage of this first transistor, and to form a switches set, this transistor seconds has a base stage and is connected to this first resistor, by the conducting and the not conducting of first this transistor seconds of voltage control of this first resistor; And
One second resistor, it is connected in this power supply and this first transistor, and this second resistor is in order to providing the base stage of one second voltage to this first transistor, by the conducting and the not conducting of second this first transistor of voltage control of this second resistor;
When this power source voltage just often, this not start of overvoltage protection element, first voltage of this first resistor can not make this transistor seconds conducting simultaneously, and this first transistor of second voltage turn-on of this second resistor, is supplied to this motor drive circuit to allow this power source voltage;
When this power supply produces overvoltage; this overvoltage protection element forms short circuit; overvoltage with this power supply of releasing; first voltage of this first resistor makes this transistor seconds conducting simultaneously; to allow this power supply to form ground connection via this transistor seconds; and second voltage of this second resistor no longer makes this first transistor conducting, continues to be supplied to this motor drive circuit to prevent this power source voltage.
2, the excess voltage protection of brush DC fan motor according to claim 1 is characterized in that: this over-current protecting element is a Zener diode.
3, the excess voltage protection of brush DC fan motor according to claim 1 is characterized in that: this transistor seconds is the pnp transistor.
4, the excess voltage protection of brush DC fan motor according to claim 1 is characterized in that: this transistor seconds is the npn transistor.
5, the excess voltage protection of brush DC fan motor according to claim 1; it is characterized in that: form one first common ground between this overvoltage protection element and first resistor; this first common ground is connected to the base stage of this transistor seconds, and the base stage of this first voltage to this transistor seconds is provided by this.
6, the excess voltage protection of brush DC fan motor according to claim 1; it is characterized in that: form one second common ground between the base stage of this first transistor and the transistor seconds; this second common ground is connected to this second resistor, and the base stage of this second voltage to this first transistor is provided by this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03156529 CN1592020A (en) | 2003-09-03 | 2003-09-03 | Over voltage protecting circuit for dc brushless fan motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03156529 CN1592020A (en) | 2003-09-03 | 2003-09-03 | Over voltage protecting circuit for dc brushless fan motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1592020A true CN1592020A (en) | 2005-03-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03156529 Pending CN1592020A (en) | 2003-09-03 | 2003-09-03 | Over voltage protecting circuit for dc brushless fan motor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454710C (en) * | 2005-05-13 | 2009-01-21 | 崇贸科技股份有限公司 | Over-voltage protector |
| CN100461577C (en) * | 2005-11-29 | 2009-02-11 | 台达电子工业股份有限公司 | Fan system and protection method therefor |
| CN100501169C (en) * | 2006-05-26 | 2009-06-17 | 鸿富锦精密工业（深圳）有限公司 | Luminous air blower |
| CN101499643B (en) * | 2008-02-01 | 2011-02-16 | 佛山普立华科技有限公司 | Over-voltage protection circuit |
| US9166444B2 (en) | 2010-03-26 | 2015-10-20 | Johnson Electric S.A. | Control circuit and motor device |
| CN106067675A (en) * | 2015-04-23 | 2016-11-02 | 旺玖科技股份有限公司 | High voltage protection system |
| US9614431B2 (en) | 2010-03-26 | 2017-04-04 | Johnson Electric S.A. | Control circuit and motor device |
-
2003
- 2003-09-03 CN CN 03156529 patent/CN1592020A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454710C (en) * | 2005-05-13 | 2009-01-21 | 崇贸科技股份有限公司 | Over-voltage protector |
| CN100461577C (en) * | 2005-11-29 | 2009-02-11 | 台达电子工业股份有限公司 | Fan system and protection method therefor |
| CN100501169C (en) * | 2006-05-26 | 2009-06-17 | 鸿富锦精密工业（深圳）有限公司 | Luminous air blower |
| CN101499643B (en) * | 2008-02-01 | 2011-02-16 | 佛山普立华科技有限公司 | Over-voltage protection circuit |
| US9166444B2 (en) | 2010-03-26 | 2015-10-20 | Johnson Electric S.A. | Control circuit and motor device |
| US9614431B2 (en) | 2010-03-26 | 2017-04-04 | Johnson Electric S.A. | Control circuit and motor device |
| CN106067675A (en) * | 2015-04-23 | 2016-11-02 | 旺玖科技股份有限公司 | High voltage protection system |
| CN106067675B (en) * | 2015-04-23 | 2019-04-16 | 旺玖科技股份有限公司 | High voltage protection system |
| US10338652B2 (en) | 2015-04-23 | 2019-07-02 | Prolific Technology Inc. | High voltage protection system for adjusting duty cycle by using pulse width modulation signal |
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