TWM272301U - Overvoltage protective circuit for a DC brushless motor - Google Patents

Description

M272301

[Technical field to which the new type belongs] This creation relates to an overvoltage protection circuit for a DC brushless fan motor, which is particularly related to an overvoltage failure with a simple circuit structure. [Prior art] ^ ^ Patent application No. 9122 The new patent of No. 27 "DC brushless motor current circuit" includes a first transistor, one or two transistors, a first resistor and a second resistor. The second: brother: the first resistor and the second transistor and the second resistor mutually = the current limiting circuit, the current limiting circuit has two contact terminals connected to d and a motor driving circuit, respectively. Electricity / Original should make this drop, form the road. The power is used to limit the current, but the current is not limited to the current limiting circuit. The first switch is the second continuous current and the current is limited to avoid power generation. When the power is applied to the circuit, it is accurate. The reaction voltage is turned on sharply, and the alternate pressure recovery circuit of the switch does not have the power source in the direct current of a large number of sources, and at the same time, the terminal of the second resistor is electrically closed, so that the motor drive circuit is activated. Until the first switch and the second switch are normal. When the fan runs abnormally or fails to run, its power consumption and high temperature. When an over-voltage occurs, the current-limiting circuit protects the fan motor from over-voltage. There is an over-voltage protection element, so the over-voltage is limited. % ρ μ, and electricity! It can be raised and lowered. It means galvanic. In short, when the power source is over-voltage, the voltage element is pressed to avoid the over-voltage input to the DC. In view of this, this creation improves the above-mentioned shortcomings and requires effective protection Pass the brush fan motor. Will be DC brushless fan

M272301

The motor uses an over-voltage protection element connected to a motor to prevent over-voltage wheels from entering the motor drive circuit. Operational drive [New content] In order to prevent the circuit, the main purpose of this book is to provide a protection circuit, and to the right of the 1 W #, 剕 fan motor overvoltage ^ κ ^ / Overvoltage with early circuit structure In a motor drive circuit, to avoid the connection failure of # 索 1 protection circuit, the creative circuit has a true corrosion effect. The over-voltage circuit breaks & Doujun 'has the effect of extending the service life. The secondary purpose of this creation is to provide a protection circuit, i uses i „„ Straight ”, brushing the overvoltage of the fan motor to make this creation have a simplified structure. The voltage guarantees 4 components. Brushing the fan motor's over-electricity ® circuit, crying, a piece of ginger, a first resistor, a second resistor, Yu Lei 75 fen body and a second transistor. The pass The voltage protection element I is connected between the motor driving circuit Γ ^ and is connected between the power source and 4 j in order to discharge the overvoltage of the power source. The first resistor is used to apply voltage to the second transistor to control it. Conduction and non-conduction. The Γ, the crystal is connected to the second transistor to form a switch group, and the switch group formed by the first transistor and the second transistor is connected to the overvoltage protection, and the part is driven by the fan motor Between the circuits in order to block the overvoltage of the power supply. The second resistor is used to provide a voltage to the first transistor to control its conduction and non-conduction. When the power supply generates an overvoltage, the overvoltage protection element will Cause the second transistor to be turned on The overvoltage of the power supply directly to the ground, and is formed such that the first transistor nonconductive, and the fan motor driving circuit is formed breaking.

M272301

[Embodiment] In order to make the above and other purposes and formulas of this creation, a detailed description is as follows. In conjunction with the attached drawings, Wei reveals the circuit diagram of the brushless DC overvoltage protection circuit of the first preferred embodiment of the present invention. Please refer to #-图 所 for the feather motor. The over-voltage protection circuit 10 of the fan motor of the first preferred embodiment of this creation is provided between the power source [Vcc] = the motor drive circuit 2. This over-voltage protection circuit 丨 〇 包 ^ _ ____ Over-electricity M 1 1

Protective element 1 1, a first resistor 丨 2, a first transistor 1 4 and a second transistor 1 5 Please refer to the first figure again. The overvoltage protection element 丨 丨 and the first positive state 1 2 forms a series connection on a common point a, and is connected between the power source j and the connector so as to discharge the overvoltage of the power source 1. The overvoltage protection element 丨 丨 > belongs to a Zener diode [Z e n e r d i 0 d e]. Therefore, the power source 1 can be grounded via the over-voltage protection element 11 and the first resistor 12. The Γth electric generator 12 is used to provide a voltage Va. When the over-voltage protection element collapses and forms a short circuit, a current will flow through the first resistor 12, so it generates a voltage va at the common point a. In addition, the first transistor 14 is connected to the second transistor 15 to form a switch group. The first transistor 14 has a base connected to the second transistor 15. The second transistor 15 is a pnp transistor, which has an emitter connected to the base of the first transistor 14 and another base connected to the common point a. Thus, the overvoltage protection element 11 and The first resistor 12 can control the

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M272301 IV. Creation Instructions (4) The voltage Va of the base of the second transistor 15 is used to complete the control of its conduction and conduction. Then, the voltage Vb of the base of the first transistor 14 is controlled by the conduction and non-conduction of the second transistor 15 to complete the switch that controls the conduction and non-conduction of the transistor 14 and the second transistor 5 The group is connected between the series combination of the over-current element 11 and the first resistor 12 and the motor drive circuit ... and so on, in order to block the power supply! Over voltage. The second resistor 13 is between the common point b composed of the base of the first transistor and the emitter of the second transistor, and the second resistor 13 is used to provide a voltage Vb to The base of the first transistor 14 controls the base of the -transistor by the lightning and vb to complete controlling it; S3 is on. In this way, the voltage of the power source 丨 is allowed to be input to the motor driving circuit, or the voltage of the power source 1 is cut off to be input to the motor driving circuit 2. Can be formed through the second resistor 13 and the second transistor 15: Connect to Haidian, please: J According to the first picture, when the voltage of the power source is "v", the power source i is in the first resistor The voltage Va of 12 is not enough to be positive ^ Over-power = protective element U forms a ground. At this time, the 1 resistance mark ^ South level. In this way, the "stomach-resistor 12 cannot provide low voltage; pass the second power The base of the crystal 15, so that the second electric crystal conduction at this time, the power supply 1 maintains the voltage U formed by the second resistor 13; V bit, so the voltage Vb turns on the first-]; Temple-quasi power supply 1 The voltage VCC is supplied to the fan motor driving circuit 2. Allowed: When the power supply 1 generates an overvoltage, the voltage of the power supply 1 rises rapidly. Once the voltage of the power supply 1 to provide a sharply rising voltage is greater than the overvoltage protection element 1

M272301 IV. Creative Instructions (5) When the overvoltage protection element 丨 i-shaped when the breakdown voltage of 11 is 1, a current is conducted to the first resistor 12, and therefore the ground. The resistor 1 2 of the second transistor 15 can be turned on when the voltage v a is provided to form a low level to the second transistor 15. When the second transistor 5f pole passes the current of the power source 1 through the second resistor 3 and the second ¥ is turned on, the voltage Vb forms a low level, because of the low level voltage Vb Turning on the states 14 to 14 to prevent the sharply rising voltage of the power source 1 from the first transistor to the fan motor driving circuit 2. Cc continues to supply When the power supply 1 eliminates the overvoltage, the voltage of the power supply 丨 is less than the voltage VCC of the power supply 1 is lower than the overvoltage protection element 丨 4 $ drop. At one time, the overvoltage protection element 11 is opened. At the same time, the voltage Va of the diagnosis = breakdown voltage 12 forms a high level and is provided to the second transistor 15 to make the second transistor 15 non-conductive. When the base of the second transistor 1 is formed, the voltage Vb of the second resistor 13 forms a high level. No, the first transistor 14 is turned on, so the power supply of the remote transistor ^ b can be further supplied to This fan motor drive circuit 2. The second figure of voltage Vcc reveals the circuit diagram of the second preferred embodiment of the DC brushless overvoltage protection circuit. With reference to the second figure shown in the figure of the feather motor, the overvoltage protection circuit element of the second preferred embodiment of the present invention is correspondingly provided in the current limiting circuit element of the first preferred embodiment, so the same figure is used in the same part of the element. The numbers are labeled so as to easily explain the differences between the preferred embodiments of the present invention. Part of the second preferred embodiment If the inner valley of the knife technique has been disclosed in the first figure or its description, it is incorporated herein by reference 'and will not be described in detail.

j \ Log〇-5 \ Five Continents \ PK9272M. Ptd Page 11 M272301 IV. Creation Instructions (6) Please refer to the second figure again, the overvoltage protection circuit of the DC helmet motor in the second preferred embodiment 1 〇 Connected to this power source [Vcc] i = Yuda drive circuit 2. The over-voltage protection circuit 10 includes an over-voltage device 11, a first resistor 12, a second resistor 13, and two lightning? 14 and a second transistor 15. Electric sun and sun body Compared with the first preferred embodiment, the second 15 of the second preferred embodiment is a πρη transistor. The overvoltage protection element u and the first can control the voltage Va ′ of the base of the second transistor 15 to be turned on and off. Work towel

Please refer to the second figure again, when the voltage Vcc of the power supply 1 is maintained at ##, the voltage Vcc of the power supply 1 is not enough to short-circuit the overvoltage protection element 丨 丨. At this time, the first resistor 15 cannot provide a high voltage to make the second transistor 15 conductive, so the second transistor 15 is not conductive. On this day, the voltage Vb formed by the power source 1 at the second resistor 13 maintains a high level ',' so that the voltage Vb can turn on the first transistor 14 to allow the voltage Vcc of the power source j to be supplied to This fan motor drive circuit 2. "When the power supply 1 generates an overvoltage, the voltage of the power supply 丨 rises rapidly. Once the voltage provided by the power supply 1 with a sharply rising voltage is greater than the breakdown voltage of the overvoltage protection element 11, the overvoltage protection element ^ forms a short circuit. / At the same time, the first resistor 12 will conduct current, so the first resistor i 2 can provide a voltage Va to form a high level to the base of the second transistor ι5, which violates the second power. The crystal 15 'is turned on. When the second transistor 15 is turned on, the current of the power source 1 passes through the second resistor 3, and the voltage Vb of the second resistor 13 will form a low level. , So the voltage 仏 no longer makes the first

M272301 ◎, Creation Note (7) Transistor 1 4 is turned on, and it is possible to prevent the sharply rising power supply 1 overvoltage Vcc from continuing to be supplied to the motor drive circuit 2. When the power supply 1 eliminates the overvoltage, the voltage of the power supply 1 gradually decreases. Once the voltage Vcc of the power source 1 is lower than the breakdown voltage of the overvoltage protection element 11, the overvoltage protection element 11 forms an open circuit. At the same time, the voltage Va of the first resistor 12 forms a low level and is supplied to the base of the second transistor 15 ', so that the second transistor 5 is not turned on. When the second transistor 15 is not conducting, the current of the power source 1 cannot pass through the second resistor 13 and the voltage Vb of the second resistor 13 forms a high level, so the voltage Vb causes the first _ Transistor 1 4 is on, so the voltage vcc of the power supply 1 can be allowed to be supplied to the fan motor driving circuit 2 again. To God and

Although the creation has been disclosed in the aforementioned preferred embodiment, it is not used in the creation. Any person skilled in this art can make various changes and modifications without departing from the scope of the creation. Baodang regards those defined in the scope of patent application attached. '

M272301 Schematic description [Schematic description] Figure 1 • Circuit diagram of the overvoltage protection circuit of the DC brushless fan motor in the first preferred embodiment of this creation. Circuit diagram of over-voltage protection circuit for brushing fan motors 〇 Explanation of drawing number I 1 Power supply 2 Fan motor drive circuit 10 Over-voltage protection circuit 11 Over-voltage protection element 12 First resistor 13 Second resistor 14 First transistor 15 Second resistor Crystal 15, _ | transistor

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Claims (1)

M272301 Fifth, the scope of patent application " " '--a kind of overvoltage protection circuit for direct brushless fan motors, including overvoltage protection components, which is located between the circuit package circuit, and the same technology Private power and a wind motor drive voltage protection element can be between the source and ground, the over-killer J is used to release the over-voltage of the power supply; the electrical resistance is' it is connected to the over-voltage The protection element resistor is used to provide a first voltage; only the first m body is connected between the power source and the fan motor driving circuit, the first transistor has a base; the moving circuit: the second circuit Crystal 'which is connected to the first transistor, Leiyang Wu-An electric sun body has a base connected to the first transistor. The second voltage is controlled by the first voltage of the first resistor. The body is conductive and non-conductive; and 'the second resistor is used to provide a second voltage to the base of the first electricity', the second transistor's second voltage is used to control the conduction and non-conduction of the first transistor Conduction; = the over-current, the protection element and the first resistor Forming a first, common point, the first common point is connected to the base of the second transistor, thereby providing the first voltage to the base of the second transistor; when the voltage of the power source is normal, the The over-voltage protection element does not operate, and the first voltage of the first resistor cannot turn on the second transistor, and the second voltage of the second resistor turns on the first transistor to allow the voltage supply of the power supply. To the motor drive circuit; the first resistor is connected to the power source and the first transistor, which is IX Japan Mh. ^ _ M272301 5. Scope of patent application When the power source generates an overvoltage, the circuit will be used to put the overvoltage of the power source to ground the second transistor and the second transistor, and then the first transistor should be turned on to the motor drive. Electric Ming ^. 2. According to the scope of the patent application, the first protection circuit 'wherein the over-current 4 benefits range, among which a type of DC brushless wind according to the application of a special protection circuit, the first fan motor, the over-voltage, the body is on and the first, To prevent the over voltage of the DC crystal protected by the DC voltage protection: A voltage protection between the over voltage circuit and the element voltage protection tank. 1 1 4 7L pieces can simultaneously the first φ, electric P and, to allow Xi # 一 + τ 4 The second source of a resistor and the power supply of the power supply + ~ The voltage of the brushless fan motor element of the electric source belongs to the ~ snail brushless fan motor belongs to the ρηρ electric crystal voltage protection circuit, the protection element, and the same piece can be used A first resistor, the resistor is used to provide a first piece, which is connected at the same time to discharge the first light of the serial connector, the voltage does not continue to supply the overvoltage diode overvoltage circuit package, and the first moving circuit is used to The first and second electric devices are arranged on a power source and a wind belongs to an overvoltage of the power source between the power source and the ground; to the overvoltage protection element, voltage; a base is driven on the power source and the fan motor; to the The base transistor of the first transistor has a first voltage controlled by a base connected to the resistor and its connecting crystal with a second electric first electric first transistor, the first electric second transistor, Group, which can be turned on and off; a switching resistor is formed between the M272301 on page 16 5. The scope of application for patents is one and two, and the two of the first base crystals jointly provide the current and the current, and allow the second resistor of the electrical resistor to pass through and the first power. Point, the second power source, the first power source, the second power source generating circuit, and the discharge of the voltage can make the second transistor shape, and then the first power source should be protected according to the application. Fan Lu, whose speed controller uses the second common voltage of the second non-conducting crystal to the voltage of the resistor of the normal resistor. The voltage of the second electrical grounding crystal driving circuit of the power source is the same as that in the fourth. Two voltages between the source of the first resistor and the first transistor to the first transistor and the second voltage controlling the first electric base and the second transistor to be connected to the first body at the same point The base voltage cannot ensure that the first transistor is supplied when the first voltage exceeds the first voltage, and the transistor is turned on, and to the overvoltage, the second transistor is turned on to prevent the motor drive voltage from being maintained at the same time to allow a Prevent a second resistor from being formed between the electric body, thereby protecting the element; the protection element does not move; the second transistor conducts the first transistor to move the circuit; the protection element may form a first mouth through the g The electric motor does not continue to supply the first electric voltage to the second source of the power supply. The brushless wind belongs to the motor's over-current. One piece belongs to the zener two-pole ship. According to the 4th scope of the patent application, the DC brushless Wind and protection circuit, wherein the second transistor system is an over-current & ηρη transistor of the ηη $ motor. DC voltage protection C: \ Logo-5 \ Five Continents \ PK9272M.ptd