TWM245664U - DC motor protection circuit - Google Patents

Description

M245664? Creative Instructions Q) [Technical field of the new type] A kind of DC motor protection circuit. When the power supply is reversed, the drive circuit or the direct type is provided with a protection circuit that prevents the motor from being burned.

The power A of each component of the computer is large. On this side, the CPUS cuts two's, and its heat generation is also increasing by the hundreds of thousands of times, and has developed to: large. When the number of CPU transistors from 386 ordinary coffee surface temperature can be captured-generation = 0. When there are more than 10,000, the second is as high as 80 or even hundreds of sounds. J \ j 5 0 80 C. The CPU is even higher. As a result, the computer world ’s requirements for heat dissipation have become more and more common. The most common is the air-cooled cooling method; J = the key component of the heat dissipation device < τ λ ^ The government thermal fan as the air-cooled radiator has been caused, which has caused People pay attention to it. The motor technology of the fan is the most critical type of fan motor in the fan. 'The fans can be divided into direct current; = :: j uses a carbon brushless DC motor and no carbon two, and the DC fan mostly produces magnetic water that produces miso h. The Γ i L motor uses the internal control circuit to generate k-shaped magnetic force to move the fan blades to change. Please refer to the first figure, the block diagram of the low-protection circuit of the m :? working power [, Used in the middle circuit: σ carbonless brushless DC motor-to deal with tapping π "the two protection elements 24 are rectifiers and the body is connected in series" the source 22 and the drive circuit

The circuit is composed of driving K261 and Hall element ⑽, and when 夂 J can be used to reverse the voltage by the characteristics of rectifying a pole body, "]: coincidence of DC motor caused by f, 22 reverse connection ' However, in normal work, the second picture is familiar with carbon brushless M245664

As shown in the block diagram of the circuit's electrical waste distribution, the rectifier diode ΐ has a voltage drop of about 0.7 volts. If it is driven by a 5 volt, strong voltage source, in fact, the electrical glands are driven? β 口 古田 Reduces the overall heat dissipation efficiency of the fan. [New content] The main reason for the protection of the main power supply protection unit is that the first-class motor has a high electric power in the direct and the direct protection electrical body. Please refer to only providing the drive. , And less than Xi Ke obviously the fan's ability can be further used in this creative application, which is to provide a loose version of the fan that can obviously increase the circuit and the forward direction; the straight-flow DC circuit should be directly known Changing the details of the heat dissipation step is not original, and it is less than the traditional reduction and is for the road, including connecting to the straight piece, connecting the driving circuit components to protect the components. This circuit has fewer and is reduced to technical content. Attached Schema. When connected in reverse, the components are in the circuit components, due to the shape, and for the purpose mentioned, the DC power supply is used for current power and current motor. The road and the motor pressure drop far pressure, so and improve the review committee The following related references and comments Motor damage itself improves the thermal efficiency of the motor. One kind of direct current; between the drive of the first drive motor, the DC power supply works abnormally and the protection element improves the motor's efficiency. Understand the detailed description of this invention and the voltage drop of the protective element used to protect the circuit of the circuit. The voltage motor protects the electric circuit due to the voltage motor. A protection element is used to protect the connection when the protection is on. Reduced features and technical drawings, but the creation of

M245664 IV. Creation Instructions (3) ----- [Embodiment] y The second picture is a block diagram of the creation of a carbonless brushless DC motor protection circuit 10, which is used for the cooling fan drive circuit i 6 and DC motor i 8 The protection includes: DC power supply 1 2. DC motor 1 8. A drive circuit 6 and protection element 14. The DC motor is a carbon brushless DC, and the protection element 1 4 is For a Schottky diode. Please refer to the third figure again, wherein the driving circuit 16 further includes a driving IC 161 connected to a Hall element 162, and the driving IC 61 is connected to an induction coil inside the DC motor 18, and the inside of the DC motor is induced via the Hall element 162. The magnetic field changes and generates high and low potential signals respectively, which are used to control the operation of the driving IC 1 6 1 and then drive the DC motor 丨 8 to run. Among them, a resistance can be connected in series between the element 162 and the reference potential 19 The device 1 ^ can limit the current flowing through the Hall element 162 by the characteristics of the resistor R, so as to protect the Hall element 6 2 from being damaged when the current is too large. Please refer to the third figure again, in which the DC power source 丨 2 provides the power required for the entire protection circuit and the DC motor to operate. A protection element 丨 4 is connected in series between the DC power source 丨 2 and the drive circuit 16 for When the DC power source 2 is reversely connected, the circuit is turned OFF, so that the driving circuit 16 and the DC motor 18 will not cause significant damage, and a capacitor C can be connected in parallel between the driving circuit 16 and the protection element 14 for direct current. Immediately after the power source 12 is turned on (ON), the surge voltage caused in the circuit causes the drive circuit 6 to withstand and burn out. Please refer to the third figure again, in which the protection element 丨 4 is a Schottky diode. Due to the Schottky diode's forward conduction bias voltage is generally 0.2 volts, which is much smaller than the conventional rectifier diode. Body 0.7 volts, so it can be reduced because

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M245664

The phenomenon that the speed of the flow motor 18 decreases, and the cooling efficiency of the direct fan is improved: to achieve protection, change, and increase the voltage of the road. Ί :: The system is known as the carbonless brushless DC motor protection circuit. a private θ, where the DC power supply 22 is a 5 volt DC power supply-when the current flow element ^ is turned on, the protection element 24 is conductive; the protection element ； is chivalrous; ^ body, general rectifier diodes when the two ends of the voltage & Therefore, the operating voltage supplied to the drive circuit 26 is only wide: 7: When wide, 7 will cause the speed of the DC motor 28 to decrease and affect the cooling efficiency of the fan. A block diagram of the voltage distribution of the circuit, where the DC power supply 12 is a f of a 5 volt pintrat straight current circuit. When the circuit is operating normally, the protection element 14 is turned on. The protection element 14 is a Schottky diode, generally Xiao The voltage drop between the two ends of the dynode when it is turned on is 2 volts, so the operating voltage supplied to the drive circuit 16 is 48 volts: Therefore, the situation of the speed reduction can be significantly improved to achieve protection to reduce the speed change and raise the ear. Fan cooling effect As mentioned above, this creation can provide a protection element to prevent the damage of the drive circuit 16 and the DC motor 18 caused by the reverse connection of the direct voltage to the voltage 12, and can be used by the The protection element 14 has a small Schottky diode with smooth forward conduction; the voltage 'makes the DC power supply 12 to supply a relatively high voltage to the drive circuit 16 and increases the operating capacity of the DC motor 18 to improve the cooling efficiency of the fan. .W said in summary, 'This creation is fully in line with the requirements of patent application, so the United States filed an application in accordance with the patent law.

M245664

The fishing inspection committee has any inspection committee to protect the rights and interests of the creators. If in doubt, please follow the instructions of the letter. Detailed description: i: description :: the best embodiment of this creation-similar changes to the actual implementation of the spirit of the patent scope of this creation and its knowledge of the technology: iL ',: Bao ί in the mouth of this creative fan Any kind of decoration can be covered, the changes that can be easily considered or Xiu Qingbai 'are in the patent scope of the following case. Person

The M245664 diagram on the ninth page (1) illustrates the diagram, one is a block diagram of a conventional brushless DC motor protection circuit; the second is a circuit voltage distribution block diagram of a conventional carbon brushless DC motor protection circuit The third figure is the block diagram of the protection circuit of the carbonless brushless DC motor of the creation; and the fourth figure is the block diagram of the voltage distribution of the circuit of the protection of the carbonless brushless DC motor. (2) Description of drawing number: 22 DC power source 24 protection element 2 6 drive circuit 2 8 DC motor 2 6 1 drive IC 2 6 2 Hall element Original creation: 1 0 carbon brushless DC motor protection circuit 1 2 DC power source 1 4 Protective element 1 6 Drive circuit 1 6 1 Drive IC 1 6 2 Hall element 1 8 DC motor 1 9 Reference potential

Page 10 M245664 Schematic description R resistor C capacitor mill

Claims (1)

M245664 5. Scope of patent application 1. A DC motor protection circuit comprising: a DC power supply; a DC motor; a drive circuit connected to the DC motor for driving the DC motor to operate; and a protection element for connection Between the DC power source and the driving circuit, it is used to protect the driving circuit and the DC motor. 2. The DC motor protection circuit according to item 1 of the patent application scope, wherein the DC motor is a carbon brushless DC motor. 3. The DC motor protection circuit according to item 1 of the scope of patent application, wherein the driving circuit includes: a driving IC for driving the operation of the DC motor; and a Hall element connected to the driving IC. Cooperate with the driving IC to control the operation of the DC motor. 4. The DC motor protection circuit according to item 3 of the scope of patent application, wherein a resistor is further connected between the Hall element and a reference potential, and is used for current limiting protection of the Hall element. 5. The DC motor protection circuit according to item 1 of the scope of patent application, wherein the protection element is a Schottky diode. 6. The protection circuit for preventing the DC motor from being reversely burned as described in item 1 of the scope of the patent application, wherein a capacitor is connected between the protection element and the driving circuit to protect the driving circuit from the DC power supply. The voltage surge phenomenon caused when turning on. Page 12