CN110311601B

CN110311601B - Clamping mechanism outage directional release circuit device and have this circuit device's support and on-vehicle support

Info

Publication number: CN110311601B
Application number: CN201910696836.2A
Authority: CN
Inventors: 罗宜成; 陈林松
Original assignee: Shenzhen Times Innovation Technology Co Ltd
Current assignee: Shenzhen Times Innovation Technology Co Ltd
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2022-04-29
Anticipated expiration: 2039-07-30
Also published as: CN110311601A

Abstract

The invention discloses a clamping mechanism power-off directional release circuit device, which comprises a main circuit, wherein the main circuit comprises a motor control circuit for controlling a direct current motor and an MCU control circuit for transmitting an electric signal instruction to the motor control circuit, and the motor control circuit comprises a motor driving chip and an energy storage type electrolytic capacitor; the MCU control circuit comprises a control chip, when the main circuit is powered off, the energy storage type electrolytic capacitor discharges to enable the motor driving chip and the control chip to continue to operate, the control chip is used for controlling pins of the motor driving chip and the motor driving chip to be respectively and electrically connected correspondingly, the chip control chip transmits an electric signal to the motor driving chip to enable the motor driving chip to control the direct current motor to reversely rotate within t seconds, and when the direct current motor is locked, the control chip controls the direct current motor to stop rotating. The invention also provides a vehicle-mounted bracket.

Description

Clamping mechanism outage directional release circuit device and have this circuit device's support and on-vehicle support

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of electrical equipment, in particular to a clamping mechanism power-off directional release circuit device, a bracket with the circuit device and a vehicle-mounted bracket.

[ background of the invention ]

A dc motor is an electric motor that converts dc electrical energy into mechanical energy. The speed-regulating device is widely applied to electric traction due to good speed-regulating performance.

The direct current motor can be divided into large, medium and small direct current motors according to specification and size, the common small direct current motor in the market is mostly unidirectional, the direct current motor does not usually have a reversing function when the power is off, and some specific scenes just need to utilize the function. In other application scenes such as some clamps or safety valves, if the fingers of a human body are clamped, even if the safety protection circuit is powered off in time, the fingers of the human body cannot be pulled out immediately, and therefore secondary damage is caused.

Therefore, a small dc motor with directional (mostly reverse) release is available, but the necessary features of this kind of design for the small dc motor are: the drive circuit can bear large current; therefore, the prior art is often realized by adopting a super capacitor with high current discharge capacity, but the super capacitor has the following defects:

1. firstly, the super capacitor is very expensive, the super capacitor of an original factory is quite close to thousands, for manufacturers, thousands of super capacitors are arranged to realize the protection of some smaller parts or realize some functions, and the economic efficiency is a considerable problem.

2. The super capacitor has higher resistance, the super capacitor of the low capacitor has resistance up to hundreds of ohms, the peak current of the circuit depends on the electromotive force and the internal resistance of the power supply as well as is known to be well known, under the condition that the resistance of the super capacitor is very high, the super capacitor of the large capacitor can not meet the requirement of the peak current, and the price problem of the super capacitor of the large capacitor is related to the first point.

3. If adopt super capacitor still have one and be the current leakage problem that its big internal resistance leads to, small-size direct current motor just can't normally operate less than a certain voltage value, MCU at this moment is still operating, in the in-process of the electric current gradual release for MCU work is in the memory mode of losing power, when starting next time, leads to some function anomaly easily, like I0 bars lock, MCU runs and flies etc..

4. When the super capacitor is applied to a small direct current motor, due to the characteristic of high resistance, the charging and discharging voltage difference is easily caused, if 5V is used for charging, the discharging is only 4.5V-4.7V, and the energy efficiency utilization is reduced.

Therefore, how to design a driving circuit device that can overcome the above problems and be applied to a small dc motor is a problem to be solved in the prior art.

[ summary of the invention ]

In order to overcome the problems, the invention provides a clamping mechanism power-off directional release circuit device, a bracket with the circuit device and a vehicle-mounted bracket.

In order to solve the above technical problems, the present invention provides a technical solution as follows: the invention provides a clamping mechanism power-off directional release circuit device, which comprises a main circuit, wherein the main circuit comprises a motor control circuit for controlling a direct current motor and an MCU control circuit for transmitting an electric signal instruction to the motor control circuit, and the motor control circuit comprises a motor driving chip and an energy storage type electrolytic capacitor; the positive/negative plate of the energy storage type electrolytic capacitor and the positive/negative pin of the power supply of the motor driving chip are respectively and correspondingly connected, the MCU control circuit comprises a control chip, the positive pin of the power supply of the control chip is connected in series/parallel between the positive plate and the positive pin of the motor driving chip, and the control chip is used for judging whether the total circuit is powered off or not, when the main circuit is powered on, the energy storage type electrolytic capacitor starts to charge, when the main circuit is powered off, the energy storage type electrolytic capacitor discharges to enable the motor driving chip and the control chip to continue to operate, the control chip is used for controlling the pins of the motor driving chip and the motor driving chip to be respectively and electrically connected correspondingly, the chip control chip transmits an electric signal to the motor driving chip to enable the motor driving chip to control the direct-current motor to reversely rotate within t seconds, wherein t is set to be 0-2 s, and a one-way diode is arranged in the discharging current direction of the energy storage type electrolytic capacitor.

Preferably, the circuit further comprises an optical coupling circuit, a resistor and a capacitor; after being connected in parallel, the resistor and the capacitor are connected in series between the negative electrode plate and the negative electrode pin of the motor driving chip, the optical coupling circuit comprises an optoelectronic coupling driver and an optoelectronic coupler, and the positive electrode of the optoelectronic coupling driver is also connected in series between the negative electrode plate and the negative electrode pin of the motor driving chip and is in series relation with the resistor; the negative pole of the photoelectric coupler is connected with the positive pole of the photoelectric coupler, and the negative pole of the photoelectric coupler is connected to a pin which correspondingly controls the stop of the direct current motor on the control chip; when the current of total circuit is zero, the electric capacity discharges, when the voltage of resistance risees the default, arouse photoelectric coupling driver response, the current of passing through the resistance can follow and take place linear change to arouse photoelectric coupling driver response, photoelectric coupling driver makes photoelectric coupling ware electrical property switch on, when photoelectric coupling ware electrical property switches on, the pin that control chip corresponds control direct current motor and stops will receive the signal of telecommunication, with control direct current motor stall.

Preferably, the power supply device further comprises a power supply input circuit, the power supply input circuit can be electrically connected to the positive/negative electrode pin on the input male head correspondingly to form a positive/negative electrode input end, and the positive electrode input end of the power supply input circuit is connected to the input detection pin for supplying power to the control chip.

Preferably, the low dropout regulator further comprises a low dropout linear regulator tube, wherein the output end of the low dropout linear regulator tube is connected to the positive electrode pin of the motor driving chip, and the input end of the low dropout linear regulator tube is connected to the input detection pin of the control chip for supplying power.

Preferably, the direct current motor further comprises an infrared sensing circuit, the infrared sensing circuit comprises an infrared sensor, the infrared sensing circuit is connected to a corresponding pin of the control chip, the infrared sensor is connected in series in the infrared sensing circuit and does not form a passage, and when the infrared sensor senses an external object, the infrared sensing circuit forms a passage, so that the control chip starts responding and sends an instruction to the motor driving chip to enable the direct current motor to operate.

Preferably, the input male head is any one of microUSB, BNC male head and two/three-hole male head.

Preferably, the direct current motor further comprises a key, wherein the key is an external touch key or a mechanical key, the key is connected to a corresponding pin of the control chip, and when a human body touches or presses the key, the pin corresponding to the control chip is triggered to start responding, so that an instruction is issued to the motor driving chip to control the direct current motor to operate.

Preferably, the LED is connected to the corresponding pin of the control chip.

In order to better solve the problems, the invention also provides a bracket which needs to utilize the clamping mechanism to power off the directional release circuit device when supporting and fixing external articles.

In order to further better solve the above problems, the present invention further provides a vehicle-mounted bracket, which includes two clamping arms, and when the two clamping arms are used for fixing an electronic product and releasing the two clamping arms after the vehicle-mounted bracket is powered off, the clamping mechanism is required to be used for powering off the directional release circuit device.

Compared with the prior art, the clamping mechanism power-off directional release circuit device provided by the invention has the following beneficial effects:

1. according to the invention, the energy storage type electrolytic capacitor is connected to the motor driving chip, and the control chip is connected in series or in parallel between the positive plate of the energy storage type electrolytic capacitor and the positive pin of the motor driving chip, so that when the power failure of a main circuit occurs, under the characteristic of the energy storage type electrolytic capacitor, the control chip can discharge to supply power to the control chip and the motor driving chip, the corresponding pin of the control chip responds and judges that the power failure occurs, so that an electric signal instruction is sent to the motor driving chip, and the motor driving chip further controls the reverse rotation of the direct current motor within 0-2 s; therefore, the whole process is smooth and simplified, the corresponding required electric energy can be provided after power failure through the characteristic of discharging of the energy storage type electrolytic capacitor, the control time is within a short time so as to generate the releasing action for the user at the first time, and the energy storage type electrolytic capacitor is adopted as a functional element after power failure, so that the energy storage type electrolytic capacitor has the following obvious advantages compared with the capacitor element in the prior art:

the capacitance per unit volume is very large, and is several tens to several hundreds times larger than other types of capacitors.

Secondly, the rated capacity can be very large, and tens of thousands of muf or even a few f can be easily achieved.

And the price has overwhelming advantages compared with other types, because the components of the electrolytic capacitor are all common industrial materials, such as aluminum, and the equipment for manufacturing the electrolytic capacitor is also common industrial equipment, the electrolytic capacitor can be produced in large scale, and the cost is relatively low.

2. Further utilize opto-coupler circuit to carry out the stifled commentaries on classics detection to DC motor, optoelectronic coupling driver and optoelectronic coupler are established ties to after the circuit break, optoelectronic coupler's weak electric current can make the corresponding pin response of control chip, thereby close DC motor, design meaning like this lies in, can the automatic shutdown when motor stifled commentaries on classics at every turn, exemplary if: if the circuit device is applied to the mobile phone support, after the clamping mechanism on the mobile phone support contacts the mobile phone, the clamping mechanism cannot be clamped more tightly, the direct current motor in the circuit device is blocked, and the direct current motor is stopped immediately at the moment to prevent the direct current motor from being damaged; and when the direct current motor is restarted each time, the direct current motor is in a state of stopping rotating, so that safety is ensured, and a reset effect is achieved.

3. Further public head lug connection of power input circuit and input, and power input circuit corresponds and connects on the input detection pin of control chip power supply, such advantage lies in, can regard control chip as the electronic component that the core gave instructions, so motor drive chip is equivalent to the executive component, and direct current motor is equivalent to by the executive component, other circuits are equivalent to the judgement component like opto-coupler circuit, and the one-by-one is clear, has guaranteed the integrality and the smoothness nature of operation, and the public head of input can be any kind of microUSB, the public head of BNC, two/three hole public heads.

4. The low dropout linear regulator can play a role of stabilizing current for the total circuit so as to prevent the electronic elements of the total circuit from being damaged by current and voltage overload.

5. The direct current motor further comprises an infrared sensing circuit, the infrared sensing circuit comprises an infrared sensor, the physical property of infrared rays is utilized for measurement, the infrared sensor is not in direct contact with a measured object during measurement, friction does not exist, and the direct current motor has the advantages of high sensitivity, quick response and the like, so that the direct current motor can capture external physical changes instantly, and operation is realized.

6. Besides, the infrared sensing circuit further comprises a key, wherein the key is an external touch key or a mechanical key, the key is connected to a corresponding pin of the control chip, and a human body touches or extrudes the key to trigger the pin corresponding to the control chip to start responding, so that an instruction is issued to the motor driving chip to control the direct current motor to operate, and the clamping mechanism is tightened or loosened.

7. The LED is connected to the corresponding pin of the control chip, so that different light displays can be performed according to the condition of the DC motor, for example, the LED can be turned on to provide a certain visual field for a user in a night state, or a green light is displayed in a common charging process.

8. The clamping mechanism provided by the invention can be used for releasing the clamped part after power failure by using the circuit device, so that the clamped object is loosened.

9. The bracket and the vehicle-mounted bracket provided by the invention can be directly applied with the circuit device, so that when an electronic product or other articles such as a microphone and a water cup are clamped or fixed, not only can the clamping action be realized, but also a releasing work can be carried out after power failure.

[ description of the drawings ]

FIG. 1 is a circuit diagram of a power input circuit in a first embodiment clamping mechanism power-off directional release circuit arrangement provided in the present invention;

FIG. 2 is a circuit diagram of the MCU control circuit 2 in the first embodiment clamping mechanism power-off directional release circuit device provided by the invention;

fig. 3 is a circuit diagram of a portion of the motor control circuit 3 of the first embodiment fixture de-energized directional release circuit arrangement provided by the present invention.

Fig. 4 is a circuit diagram of another part of the motor control circuit 3 in the first embodiment clamping mechanism power-off directional release circuit device provided by the invention.

Description of the drawings: 1. a power input circuit; 2. an MCU control circuit; 3. a motor control circuit; 4. an infrared sensing circuit; 100. inputting a male head; GND: a negative input end; u10: the device comprises a control chip, 200 and an infrared sensor; u6: a motor driving chip; u3, opto-electric coupling drive; u7, photoelectric coupler; EC1, EC 2: an energy storage type electrolytic capacitor; LDO: a low dropout linear regulator; LED: a light emitting diode; c33, capacitance; r26, resistance; d6, unidirectional diode; 10. a positive input terminal; 20: a first branch; 30. a second branch circuit; 40. a third branch; 50. a fourth branch; 60. a fifth branch; 70. sixth branch, 201: differential signals of the first branch; m1, DC motor.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The clamping mechanism power-off directional release circuit device provided by the invention realizes the directional release function, and can be applied to mechanisms for clamping and fixing operation tools, such as electronic product brackets, clamping plates of automobile data recorders, electric wrenches, pliers and the like.

The invention will be further described with reference to the following drawings and examples, and the following terms will be used for explanation:

motor stalling: one condition in which the motor still outputs torque at a speed of 0 revolutions is typically mechanical or man-made. The phenomenon that the motor cannot start or stop rotating is caused by the reasons of overlarge motor load, dragging mechanical failure, damaged bearings, sweeping and the like.

Photoelectric coupling driver: the device for driving the response of the photoelectric coupler is similar to a switching element.

Photoelectric coupler: hereinafter referred to as optocouplers; the photoelectric coupling element is a group of devices using light as medium to transmit electric signal, and its function is to maintain the good isolation between input and output of electric signal at ordinary times, and can make the electric signal pass through the isolated layer when necessary. The light source and the light receiver are assembled in the same closed shell and are isolated from each other by a transparent insulator. The pin of the light source is an input end, the pin of the light receiver is an output end, the common light source is a light emitting diode, and the light receiver is a photosensitive diode, a phototriode and the like.

LDO: is a low dropout linear regulator. The excess voltage is subtracted from the applied input voltage using a transistor or Field Effect Transistor (FET) operating in its linear region to produce a regulated output voltage. By droop voltage is meant the minimum value of the difference between the input voltage and the output voltage required by the regulator to maintain the output voltage within 100mV above or below its nominal value.

It should be noted that the embodiments and figures of the present invention only refer to and mark the components related to the present invention, but all circuit elements are shown in the figures for the sake of circuit integrity.

Referring to fig. 1 to 4, an embodiment of the present invention provides a clamping mechanism power-off directional release circuit device (hereinafter, referred to as a total circuit), which is mainly used for directional release control of a small dc motor, and includes a power input circuit 1, an MCU control circuit 2, and a motor control circuit 3, where the power input circuit 1 is used for inputting electric energy required by the total circuit, the motor control circuit 3 is used for controlling start and stop of the small dc motor, and the MCU control circuit 2 issues a related command to the motor control circuit 3 according to a response, so as to implement directional release of the small dc motor through the MCU control circuit 2.

Referring to fig. 1, a power input circuit 1 may be electrically connected to an input male connector 100, the input male connector 100 may be used to be plugged with a female connector of an external device to supply power to the whole circuit, the input male connector 100 may use a microUSB, a BNC male connector, and a two/three-hole male connector, in this embodiment, the microUSB male connector may be used as the input male connector 100, it can be understood by those skilled in the art that, in the application of a small dc motor, a data terminal/pin of the microUSB male connector has no substantial function, so that an EP terminal and a GND terminal lead-out circuit of the microUSB male connector intersect at a point C, a V + terminal lead-out circuit is used as a positive input terminal 10 of a main circuit input of this embodiment, a circuit is further led out from the point C, one branch of the circuit is grounded, and the other branch is used as a ground input terminal (hereinafter referred to as a negative input terminal) of the main circuit of this embodiment, that is GND; and wherein a plurality of regulating capacitors are connected in parallel at the positive input terminal 10 and the negative input terminal GND.

It can be understood that the parallel connection of the two branches is used for adjusting the capacitance of the capacitor for increasing the filtering, and the relative equivalent inductance value is reduced, while the microUSB has the advantages of being adaptable to the charging heads of most electronic products nowadays, and if the two/three-hole male head or other male heads are used singly, the adaptability is not strong, so that the universality of the product is increased, but if the two/three-hole male head is used in a fixed place environment, such as a small brushless dc motor for a hair curler in a household environment, the reliability is relatively high by adopting the two/three-hole male head.

Referring to fig. 2, the MCU control circuit 2 includes a control chip U10, the specific type of the control chip U10 is not limited, in this embodiment, a microchip PIC16F630/676 chip with a type of microchip is optionally used, and the package block includes 14 pins, which are represented by pins 1 to 14 in the drawing and the following text, wherein the pin 3 is connected to an external key (not shown), and the key may be a touch key or a mechanical key, and when a human body touches or presses the key, the pin 3 of the control chip U10 is triggered to start to respond, so that the control chip U10 sends an instruction to the motor control circuit 3, thereby controlling the operation of the dc motor.

The 4 th pin is an input detection pin for controlling the power supply of the chip U10, and the power failure detection is judged by the pin, so the 4 th pin is connected to the positive input end 10 by a circuit, and a second branch 30 is led out from the circuit, wherein the second branch 30 and the positive input end 10 are in parallel connection, namely, a part of the current of the positive input end 10 flows to the control chip U10 to supply power to the control chip U10, and the other part of the current flows to the second branch 30.

The 1 st pin and the 14 th pin are respectively a VDD pin and a negative input terminal pin of the control chip U10, so the 1 st pin and the 14 th pin are respectively connected with the first branch 20 and the negative input terminal, wherein the 13 th pin is a pin with an LED indication function, the 13 th pin is provided with an LED, and the 13 th pin is directly connected with the negative input terminal after being connected with the LED.

Further, the 2 nd pin is a pin for controlling the motor to stop, and a third branch 40 is led out from the 2 nd pin; the 5 th pin and the 6 th pin are motor control signal pins, and are specifically determined according to a control program set by a control chip U10, wherein the 5 th pin leads out a fourth branch 50, and the 6 th pin leads out a fifth branch 60;

furthermore, in some specific embodiments, the infrared sensing circuit 4 is configured, and the remaining four

pins

7, 8, 9, and 10 are pins for implementing the infrared sensing function, the four

pins

7, 8, 9, 10 are thus connected to the infrared sensor circuit 4, the infrared sensor circuit 4 comprising the infrared sensor 200, the infrared sensor 200 being connected in series in the infrared sensor circuit 4 without a via, when the infrared sensor 200 senses an external object, the resistor conducts the entire infrared sensing circuit 4, thereby causing the four

pins

7, 8, 9, and 10 to respond, the control chip U10 will send a command to the motor driver chip U6, and the motor driver chip U6 will further receive a command to start the operation of the motor, as will be understood by those skilled in the art, the infrared sensing circuit 4 is a conventional circuit, and is set only for implementing the infrared sensing function, and the specific electrical connection manner is not described herein.

It will be appreciated that infrared sensing circuits are common in the use of dc motors, such as for example: during electronic from rapping bar, when detecting that the cell-phone puts into anchor clamps, electronic from rapping bar meeting self-holding cell-phone to make the cell-phone fixed.

The MCU control circuit 2 further includes electrical components for voltage regulation and current conduction, which are not described in this embodiment.

It can be understood that, when the model of the control chip U10 is changed, the positions and the number of the pins of the control chip U10 are changed, and the present invention is only an embodiment for convenience of illustration, and does not limit the connection relationship and the position relationship of the pins.

Referring to fig. 3, the motor control circuit 3 in the first embodiment includes a motor driving chip U6, and those skilled in the art can easily understand that there are many ways of driving a dc motor, but the driving principle is constant, and the motor speed is generally regulated and controlled by three methods: for weak magnetic field acceleration, voltage and speed regulation, and string resistance speed regulation, optionally, the motor driving chip U6 used for explaining the present invention in this embodiment employs a low-power dc motor driving chip, which is exemplarily shown as: the model number may be LG 9110.

The motor control circuit 3 further includes: the resistor R26, the energy storage type electrolytic capacitor EC1, the energy storage type electrolytic capacitor EC2 (hereinafter referred to as EC1 and EC2), and part of electrical components for voltage regulation and current drainage, which are not described in the embodiment.

It can be understood that the energy storage type electrolytic capacitor is widely applied to household appliances and various electronic products, the capacity range of the energy storage type electrolytic capacitor is large, generally 1-33000 muF, the rated working voltage range is 6.3-700V, the energy storage type electrolytic capacitor is low in price, the efficiency of the energy storage type electrolytic capacitor applied to a small direct current motor is very high, and therefore EC1 and EC2 are adopted in the embodiment to be used as energy supplies after power failure, and the highest cost performance is achieved.

The circuit connection relationship is as follows, the motor driving chip U6 has eight pins in total, the output terminals are an OA pin and an OB pin, the input terminals include an excitation current pin (hereinafter referred to as a VM pin), a voltage positive electrode pin (hereinafter referred to as a VCC pin), an analog negative electrode pin (hereinafter referred to as an AGND pin), and a power negative electrode pin (hereinafter referred to as a PGND pin), and the other pins are not explained in the embodiment;

the AGND pin and the PGND pin are respectively led out to branch circuits to intersect at a point a, the VM pin and the VCC pin are similarly respectively led out to branch circuits to intersect at a point B, wherein a positive plate of the EC1 and the EC2 is connected to the VDD pin from the MCU control circuit 2, that is, the first branch circuit 20, a unidirectional diode D6 is disposed at the VCC pin, and another branch circuit is led out at one end of the positive plate to connect a 201 pin from the first branch circuit 20, so that the first branch circuit 20 and the V pin are both connected to the point a, so that the external first branch circuit 20 and the external 201 pin are in a parallel relationship, it should be noted that the 201 pin of the MCU control circuit 2 is not the VCC pin of the motor driver chip U6, and the 201 pin of the MCU control circuit 2 is a differential signal of the MCU control circuit VDD pin, that is the first branch circuit 20, which is exemplarily shown in the following steps: the pin VDD of the MCU control circuit may be 3.3V, 201, 10V, 12V, 15V, 18V, 24V, etc., where the pin 201 is one of the power supplies;

further, the OA pin and OB pin of the output terminal of the motor driver chip U6 are connected to a dc motor M1, so that the dc motor M1 can execute commands of operation, stop, and reverse rotation by the electric power of the input terminal.

It can be understood that, generally speaking, EC1 and EC2 will be charged only at the moment when the power input circuit 1 is turned on, and when the voltage across EC1 and EC2 is equal to the voltage input by the power input circuit 1, EC1 and EC2 will stop charging, it can be understood that when the voltage across EC1 and EC2 is equal to the V + pin in the power input circuit 1, EC1 and EC2 are in a dc off state; meanwhile, the direct current motor M1 always has a positive direction, similarly, when the power input circuit 1 is disconnected, the EC1 and the EC2 discharge, for the polar capacitor, the positive sign on the EC1 and the EC2 flows to the negative pole, which is the discharging current direction of the polar capacitor, so that the unidirectional diode D6 is added to prevent the directions of the EC1 and the EC2 from forming a loop in other branches when the EC1 and the EC2 discharge, which causes waste of electric energy.

Further, the low dropout regulator (hereinafter referred to as LDO), the output terminal of the LDO, i.e., the negative terminal VOUT, is connected in series to the point a, and the input terminal VIN is connected in series to the 4 th pin of the control chip U10, i.e., the input detection pin for supplying power to the control chip U10, i.e., the second branch 30, it is easy to understand by those skilled in the art that the most important index of the LDO is stability, it is often seen in the design circuit that there is a large or small capacitor (not numbered) at the output terminal VOUT, when the main circuit is powered off, it is prevented that the current is instantaneously too large, which causes damage to the main circuit, and the LDO is adopted to play a role in voltage reduction and stabilization for the motor driving chip U6.

Referring to fig. 3 and fig. 4, a capacitor C33 is further included, the capacitor C33 may be a common capacitor or an energy storage type electrolytic capacitor, after the resistor R26 and the capacitor C33 are connected in parallel, the capacitor C33 is connected in series between the point B and the circuit of the negative plate of the EC1 and the EC2, and a sixth branch 70 is connected in series between the circuit, the sixth branch 70 includes a circuit of a photocoupler U3 and a photocoupler U7 (hereinafter, referred to as a photocoupler circuit), in the photocoupler circuit, the photocoupler U3 is similar to a switching element, for example: the triode is cut off at high level, and is turned on at low level, so that the input end, namely the positive end, of the photoelectric coupler U7 is connected to the output end, namely the negative end, of the photoelectric coupler U3, the input end, namely the positive end, of the photoelectric coupler U3 is connected in series to the resistor R26 and is connected between the circuits at the point B, namely the sixth branch circuit 70, and the output end, namely the negative end, of the photoelectric coupler U7 is connected to the 2 nd pin, namely the third branch circuit 40, of the MCU control circuit 2; the other parts are used for voltage regulation and current guiding electrical elements and the connection relation of the negative electrode input end, which can be shown by the figures, and the embodiment is not explained in the specification.

The necessary electrical connection relationship of the clamping mechanism power-off directional release circuit device provided by the invention is explained above, and the following is a principle explanation in specific use:

please refer to fig. 1 to fig. 4 and the above description, the circuit provided by the present invention is mainly used for directional release control when the dc motor M1 is locked, that is, when the dc motor M1 is locked, the MCU control circuit 2 can be used to issue a command to turn off the dc motor M1; when the overall power circuit is de-energized, the dc motor M1 may be allowed to reverse.

The specific working mode for detecting the locked rotor of the direct current motor M1 is as follows, when the direct current motor M1 normally works, the total circuit does not generate the triggering phenomenon, namely when the total circuit normally inputs a constant current into the power input circuit 1, the MCU control circuit 2 and the motor control circuit 3 are both in a normal running state, and at the moment, the direct current motor M1 runs at a fixed power and a rotating speed.

It can be understood that the dc motor M1 can be an electromagnetic motor and a permanent magnet motor, and it is determined according to the usage environment, wherein the permanent magnet motor has similar performance to the electromagnetic shunt motor, has large starting torque, hard mechanical characteristics, and small speed variation when the load varies, and is suitable for low-power dc driving, such as electric toys, electric tools, audio equipment, and automotive electrical appliances, so the dc motor M1 is implemented by the market as a permanent magnet motor, and includes a stator winding and a rotor, so that when the dc motor M1 rotates, the rotating magnetic field formed by the stator winding drags the rotor to rotate, and the magnetic field generated by the induced current in the rotor induces a counter-potential in the stator winding, i.e. an inductive reactance, which acts to prevent the increase of the motor stator current; the overall circuit is therefore in a smooth-running phase.

When the dc motor M1 is locked, the power factor is reduced, and if the motor is locked, the counter potential is not present, and the dc motor M1 is like an inductive element connected in the overall circuit, and only has its own resistance and inductance, and the natural current is greatly increased. According to the capacity of the direct current motor M1 and different processing technologies, the locked-rotor current of the motor is generally 5-12 times of the rated current of the motor.

Therefore, after the direct current motor M1 is powered off, the current of the direct current motor M1 is multiplied, a sufficiently high voltage is mapped on the resistor R26, the master circuit detects the phenomenon to judge the locked rotor and stop the rotation of the motor, the core device of the detection is a photoelectric coupling driver U3, through designing a voltage monitoring point in advance, when the voltage of the resistor R26 passing the current is close to a preset voltage point, the photoelectric coupling driver enters a linear conduction region, the inside of the photoelectric coupler U7 emits light weakly, but because of the limitation of CTR (photoelectric transmission ratio), the photoelectric coupler U7 is conducted weakly but is not enough to drive the output stage of the photoelectric coupler U7 to reverse, when the voltage on the resistor R26 is detected to be increased to be equal to the preset voltage value, the photoelectric coupling driver U3 enters a saturated conduction state, and the photoelectric coupler U7 emits light normally, at this time, the output stage of the photocoupler U7 is saturated, so as to output a low level, which is notified to the control chip U10 through the third branch 40, and after the control chip U10 receives a command, the control chip U10 controls the motor driving chip U6 to turn off the motor through the fourth branch 50 on the 5 th pin and the fifth branch 60 on the 6 th pin.

Further, when the overall circuit is powered off, the specific operation mode of reversing the motor M1 at this time is as follows, when the power failure occurs, the 4 th pin of the control chip U10 will be flipped from a high level to a low level, the process control chip U10 determines that the power failure occurs, most functions of the overall circuit will be disabled at this time, the operable portion is the control chip U10, and the motor drive chip U6, currents of the two portions are taken from the characteristics of the EC1 and the EC2 electrolytic capacitors, after the power failure occurs, the control chip U10 sends a signal of a preset motor release direction to the motor drive chip U6, and the motor drive chip operates in the fixed release direction for less than 1s, so that the dc motor M1 completes the power failure reversal operation, and after such an operation is completed, the electric energy of the EC1 EC2 is almost exhausted.

It can be understood from the above description that EC1 and EC2 are energy storage electrolytic capacitors, as a container capable of storing electric charges, and have a discharging characteristic, when the overall circuit is in a power-off state, EC1 and EC2 will discharge, and it can be known by the motor control circuit 3 that EC1 and EC2 will form a path through the first branch 20, the motor driving chip U6 and the control chip U10 when discharging, and at this time, the control chip U10 can control the motor driving chip U6 to issue a reverse command to the dc motor M1 through a program.

Further, the control chip U10 controls the motor driving chip U6 to reverse the DC motor M1 within t seconds, wherein t is set to 0-2 s, preferably 0-1 s.

It can be understood that the control chip U10 is a control chip similar to a single chip microcomputer, and can implement the above-mentioned command through a timing program, and the command is set in such a way that after the dc motor M1 is stopped, in many devices, a reverse releasing command is required, and an actual product such as an electric mobile phone holder product mounted on a vehicle brings convenience and also causes problems, and after the power of the vehicle is turned off, the mobile phone on the mobile phone holder mounted on the vehicle cannot be taken out, so that the command can be used for releasing the mobile phone thereon.

In some embodiments, it is assumed that the motor driver chip U6 can enter the motor control circuit 3 through the OA pin and the OB pin to charge the EC1 and the EC2, and as can be seen from the above, the dc motor M1 generates a current 5 to 12 times of the rated current after being locked, so that the motor driver chip U6 can be set to charge the EC1 and the EC2 in the reverse direction, and the electric energy can be fully utilized to achieve the maximum efficiency.

In order to solve the above technical problem, the present invention provides another technical solution as follows: the second embodiment of the invention also provides a power-off directional release system of a small-sized direct current motor, which comprises the power-off directional release circuit device of the clamping mechanism in the first embodiment.

In order to solve the above technical problem, the present invention provides another technical solution as follows: the third embodiment of the present invention further provides a bracket, when the bracket supports and fixes an external object, the clamping mechanism of the first embodiment is required to be used for powering off the directional releasing circuit device, when in use, the bracket can fixedly clamp an electronic product, a water cup and a microphone, and when the bracket is powered off, the clamped object can be released by using the power-off directional releasing device of the small-sized dc motor.

In order to solve the above technical problem, the present invention further provides the following solutions: the fourth embodiment of the present invention further provides a vehicle-mounted bracket, wherein the vehicle-mounted bracket is a tool for fixing an electronic product during driving, the vehicle-mounted bracket includes two clamping arms (not shown), the clamping mechanism in the first embodiment is required to be utilized for power-off directional release circuit device when the two clamping arms are used for fixing the electronic product and are released after the vehicle-mounted bracket is powered off, and the bracket can be used for fixedly clamping a mobile phone, a tablet, a microcomputer and a tablet.

It should also be understood by those skilled in the art that if all or part of the circuits of the circuit device or system, the small dc motor, are combined and replaced by fusing, simple changing, serial-parallel mutual transformation, etc., the moving positions of the components, lines, and electronic components are changed; or the products formed by the components are integrally arranged; or a detachable design; it is within the scope of the present invention to replace the corresponding components of the present invention with such circuit arrangements/devices/means.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent alterations and improvements made within the spirit of the present invention should be included in the scope of the present invention.

Claims

1. A clamping mechanism power-off directional release circuit device comprises a main circuit, wherein the main circuit comprises a motor control circuit used for controlling a direct current motor and an MCU control circuit used for transmitting an electric signal instruction to the motor control circuit,

the motor control circuit is characterized by comprising a motor driving chip and an energy storage type electrolytic capacitor;

the positive/negative plate of the energy storage type electrolytic capacitor is correspondingly connected with the positive/negative pin of the power supply of the motor driving chip,

the MCU control circuit comprises a control chip, a power supply positive pin of the control chip is connected in series/parallel between the positive plate and a positive pin of a motor driving chip, whether the main circuit is powered off or not is judged through the control chip, when the main circuit is powered on, the energy storage type electrolytic capacitor starts to charge, when the main circuit is powered off, the energy storage type electrolytic capacitor discharges to enable the motor driving chip and the control chip to continue to operate, the pins of the control chip and the motor driving chip are respectively and electrically connected correspondingly, the control chip transmits an electric signal to the motor driving chip to enable the motor driving chip to control the direct current motor to reversely rotate within t seconds, wherein t is set to be 0-2 s; and a unidirectional diode is arranged in the discharging current direction of the energy storage type electrolytic capacitor.

2. The fixture de-energized directional release circuit arrangement of claim 1,

the circuit further comprises an optical coupling circuit, a resistor and a capacitor;

the resistor and the capacitor are connected in parallel and then connected in series between the negative plate and the negative pin of the motor driving chip, the optical coupling circuit comprises an optoelectronic coupling driver and an optoelectronic coupler, and the positive electrode of the optoelectronic coupling driver is also connected in series between the negative plate and the negative pin of the motor driving chip and is in series relation with the resistor; the negative electrode of the photoelectric coupler is connected with the positive electrode of the photoelectric coupler, and the negative electrode of the photoelectric coupler is connected to a pin on the control chip which correspondingly controls the direct current motor to stop;

when the current of the main circuit is zero, the capacitor discharges, when the voltage of the resistor is increased to a preset value, the photoelectric coupling driver is caused to respond, the photoelectric coupling driver enables the photoelectric coupler to be electrically conducted, and when the photoelectric coupler is electrically conducted, the pin for controlling the direct-current motor to stop correspondingly by the control chip receives an electric signal so as to control the direct-current motor to stop rotating.

3. The circuit device of claim 1, further comprising a power input circuit and an input male, wherein the power input circuit is electrically connected to the positive/negative terminal of the input male to form a positive/negative input terminal, and the positive input terminal of the power input circuit is connected to the input detection terminal for controlling the power supply of the chip.

4. The clamping mechanism power-off directional release circuit device as claimed in claim 1, further comprising a low dropout linear regulator tube, wherein an output end of the low dropout linear regulator tube is connected to a positive electrode pin of a motor driving chip, and an input end of the low dropout linear regulator tube is connected to an input detection pin of a control chip for supplying power.

5. The circuit device for directional release of clamping mechanism during power failure of claim 1, further comprising an infrared sensor circuit, wherein the infrared sensor circuit comprises an infrared sensor, the infrared sensor circuit is connected to a corresponding pin of the control chip, the infrared sensor is connected in series in the infrared sensor circuit and does not form a passage, when the infrared sensor senses an external object, the infrared sensor circuit forms a passage, so that the control chip starts to respond, and the motor driving chip is instructed to operate the direct current motor.

6. The fixture de-energized directional release circuit arrangement of claim 3, wherein the input male is any one of microUSB, BNC male, and two/three-hole male.

7. The circuit device for directional release of clamping mechanism in case of power failure according to claim 1, further comprising a button, wherein the button is an external touch button or a mechanical button, the button is connected to a corresponding pin of the control chip, and a human body touching or pressing the button triggers the corresponding pin of the control chip to start response, so as to issue a command to the motor driving chip to control the dc motor to operate.

8. The fixture power-off directional release circuit device of claim 1, further comprising a light emitting diode connected to a corresponding pin of the control chip.

9. A rack, characterized in that, when supporting and fixing the external article, the rack needs to use the clamping mechanism de-energizing directional release circuit device of any one of claims 1 to 8.

10. A vehicle-mounted bracket, which is a tool for fixing an electronic product during driving of a user, and is characterized by comprising two clamping arms, wherein when the clamping arms are used for fixing the electronic product and when the clamping arms are released after the vehicle-mounted bracket is powered off, the clamping mechanism powered off directional release circuit device of any one of claims 1 to 8 is required.