CN218276511U - Electronic equipment and motor temperature compensation control circuit thereof - Google Patents
Electronic equipment and motor temperature compensation control circuit thereof Download PDFInfo
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- CN218276511U CN218276511U CN202221590910.6U CN202221590910U CN218276511U CN 218276511 U CN218276511 U CN 218276511U CN 202221590910 U CN202221590910 U CN 202221590910U CN 218276511 U CN218276511 U CN 218276511U
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Abstract
The utility model provides an electronic device and a motor temperature compensation control circuit thereof, which comprises a power input end, a voltage conversion circuit, a voltage feedback assembly and a motor control circuit; the power supply input end is electrically connected with the first end of the voltage conversion circuit, the output voltage feedback end of the voltage conversion circuit is connected with the first end of the voltage feedback assembly, the output end of the voltage conversion circuit is connected with the second end of the voltage feedback assembly and the input end of the motor control circuit, the enable end of the voltage conversion circuit is used for being connected with the output end of the controller, the output end of the voltage conversion circuit is used for being connected with the positive pole of the vibrator motor, and the control end of the motor control circuit is used for being electrically connected with the output end of the controller; the voltage feedback component is configured to adjust the feedback voltage according to the current environment temperature; the voltage conversion circuit is configured to adjust the magnitude of the supply voltage according to the feedback voltage. The method aims to solve the problem that the vibration sense of the motor is obviously reduced when the temperature of an application environment is reduced in the conventional vibrator motor control method.
Description
Technical Field
The utility model relates to a oscillator motor field, concretely relates to electronic equipment and motor temperature compensation control circuit thereof.
Background
At present, along the development of technique, people's life rhythm has also been faster and faster, has consequently also appeared on the market diversified portable equipment, wherein, has one type of portable equipment often to need use the oscillator motor, and simple oscillator motor is a direct current brushed motor in fact, and main control chip can realize motor pivoted control for the motor circular telegram through control circuit to turn into vibration control.
As shown in fig. 1, vcc is a power supply of a motor, motor _ ctl is a control signal of an MCU, and when the control signal is at a high level, a MOSFET controlled by the motor is turned on, and the motor vibrates; when the control signal is low, the MOSFET is turned off and the motor stops vibrating. Although this circuit can control the on and off of the vibration of the motor, in practical application, it is necessary to control the vibration sense of the motor in addition to controlling whether the motor transmits the vibration, that is, whether the motor is electrified; in the control of the vibration sense of the motor, the temperature of the application environment plays a crucial role, and the fluidity of the gear oil in the motor is reduced along with the reduction of the temperature of the application environment.
In view of this, the present application is proposed.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the present invention is to provide an electronic device and a motor temperature compensation control circuit thereof, which can effectively solve the problem that the vibration sense is obviously reduced when the motor is driven by the same control method as the motor control circuit in the prior art and the gear oil fluidity inside the motor is reduced along with the reduction of the application environment temperature.
The utility model provides a motor temperature compensation control circuit, which comprises a power input end, a voltage conversion circuit, a voltage feedback component and a motor control circuit;
the power input end is electrically connected with the first end of the voltage conversion circuit, the output voltage feedback end of the voltage conversion circuit is electrically connected with the first end of the voltage feedback component, the output end of the voltage conversion circuit is electrically connected with the second end of the voltage feedback component and the input end of the motor control circuit, the enable end of the voltage conversion circuit is electrically connected with the output end of the controller, the output end of the voltage conversion circuit is electrically connected with the anode of the vibrator motor, and the control end of the motor control circuit is electrically connected with the output end of the controller;
the voltage feedback component is configured to adjust the feedback voltage of the voltage conversion circuit according to the current environment temperature;
the voltage conversion circuit is configured to adjust the magnitude of the power supply voltage of the motor control circuit according to the current feedback voltage.
Preferably, the voltage conversion circuit includes a main inductor, a bootstrap capacitor, and a boost converter, the power input end is electrically connected to one end of the main inductor, the other end of the main inductor is electrically connected to one end of the bootstrap capacitor and the switch control end of the boost converter, the other end of the bootstrap capacitor is electrically connected to the start end of the boost converter, the output voltage feedback end of the boost converter is electrically connected to the first end of the voltage feedback assembly, the output end of the boost converter is electrically connected to the second end of the voltage feedback assembly and the input end of the motor control circuit, the ground end of the boost converter is grounded, the enable end of the boost converter is electrically connected to the output end of the controller, and the output end of the boost converter is electrically connected to the positive electrode of the motor.
Preferably, the voltage feedback component includes a first feedback resistor, a second feedback resistor, and a third feedback resistor, an output end of the boost converter is electrically connected to one end of the first feedback resistor and one end of the third feedback resistor, an output voltage feedback end of the boost converter is electrically connected to the other end of the first feedback resistor, the other end of the third feedback resistor, and one end of the second feedback resistor, and the other end of the second feedback resistor is grounded.
Preferably, the third feedback resistor is a thermistor.
Preferably, the power supply further comprises a first capacitor, one end of the first capacitor is electrically connected to the power supply input end, and the other end of the first capacitor is grounded.
Preferably, the boost converter further comprises a second capacitor, one end of the second capacitor is electrically connected to the output end of the boost converter, and the other end of the second capacitor is grounded.
Preferably, the boost converter is an SGM6x series chip.
Preferably, the motor control circuit includes a diode and a switching tube, an anode of the diode is electrically connected to the output end of the boost converter, a cathode of the diode is electrically connected to a second end of the switching tube, a first end of the switching tube is grounded, a second end of the switching tube is electrically connected to a cathode of the motor, and a control end of the switching tube is electrically connected to the output end of the controller.
Preferably, the switch tube is an NMOS tube, the control end of the switch tube is a gate of the NMOS tube, the first end of the switch tube is a source of the NMOS tube, and the second end of the switch tube is a drain of the NMOS tube.
The utility model also provides an electronic equipment, including controller and as above arbitrary the motor temperature compensation control circuit, boost converter's enable end with the output electrical connection of controller, motor control circuit's control end with the output electrical connection of controller.
In summary, in the electronic device and the motor temperature compensation control circuit thereof provided by this embodiment, the feedback voltage fed back to the boost converter by the voltage feedback component changes with the change of the ambient temperature, the boost converter adjusts the power supply voltage of the motor control circuit according to the obtained feedback voltage, and provides the power supply voltage to the vibrator motor, thereby avoiding the phenomenon that the vibration inductance of the vibrator motor is weakened due to the reduction of the ambient temperature. Therefore, the problem that the vibration sense is obviously reduced under the condition that the temperature of the application environment is low when the motor is driven by using the same control method at the moment is solved.
Drawings
Fig. 1 is a circuit diagram of a vibrator motor control circuit in the prior art.
Fig. 2 is a schematic circuit diagram of a motor temperature compensation control circuit according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings.
Referring to fig. 2, a first embodiment of the present invention provides a motor temperature compensation control circuit, which includes a power input terminal VIN, a voltage conversion circuit 3, a voltage feedback component 1, and a motor control circuit 2;
the power input end VIN is electrically connected to a first end of the voltage conversion circuit 3, an output voltage feedback end of the voltage conversion circuit 3 is electrically connected to a first end of the voltage feedback assembly 1, an output end of the voltage conversion circuit 3 is electrically connected to a second end of the voltage feedback assembly 1 and an input end of the motor control circuit 2, an enable end of the voltage conversion circuit 3 is electrically connected to an output end of a controller, an output end of the voltage conversion circuit 3 is electrically connected to an anode of the vibrator motor M, and a control end of the motor control circuit 2 is electrically connected to an output end of the controller MCU;
the voltage feedback component 1 is configured to adjust the magnitude of the feedback voltage of the voltage conversion circuit 3 according to the current ambient temperature;
wherein the voltage conversion circuit 3 is configured to adjust the magnitude of the supply voltage of the motor control circuit 2 according to the current feedback voltage.
Specifically, in the present embodiment, the voltage conversion circuit 3 may either step up or step down. The voltage conversion circuit 3 includes a main inductor L1, a bootstrap capacitor C2, and a boost converter U1, wherein the power input end VIN is electrically connected to one end of the main inductor L1, the other end of the main inductor L1 is electrically connected to one end of the bootstrap capacitor C2 and a switch control end of the boost converter U1, the other end of the bootstrap capacitor C2 is electrically connected to a start end of the boost converter U1, an output voltage feedback end of the boost converter U1 is electrically connected to a first end of the voltage feedback assembly 1, an output end of the boost converter U1 is electrically connected to a second end of the voltage feedback assembly 1 and an input end of the motor control circuit 2, a ground end of the boost converter U1 is grounded, an enable end of the boost converter U1 is electrically connected to an output end of the controller MCU, and an output end of the boost converter U1 is electrically connected to an anode of the motor M.
In practical applications, in addition to controlling whether the vibrator motor M vibrates, the vibration sense of the vibrator motor M needs to be controlled, and the fluidity of the gear oil inside the motor is reduced along with the reduction of the application environment temperature. Taking an industrial-grade scanning gun with a product specification of-40 ℃ to 80 ℃ for operation as an example, the vibration plate of the vibrator motor M has no obvious change in the range of 0 ℃ to 80 ℃ of the scanning gun, and meets the application requirement of the product; when the ambient temperature is reduced to be below 0 ℃, the vibration sense is gradually reduced along with the temperature reduction, and when the temperature is close to-40 ℃, the rotation of the motor is seriously blocked, and the vibration sense is weak.
The vibration intensity of the vibrator motor M is positively correlated with the rotation speed in addition to the structure; therefore, controlling the vibration of the motor actually requires controlling the motor speed. According to a DC oscillator motor rotating speed formula n = U- (IR + L × di/dt)/K φ, wherein U is armature voltage, I is armature current, R is resistance of an armature circuit, φ is excitation magnetic flux, and K is an induced electromotive force constant; it can be seen from the formula that, to adjust the speed of the dc oscillator motor, there are two general methods: one is an excitation control method for controlling the excitation magnetic flux phi, and the other is an armature voltage control method for controlling the armature voltage U.
Specifically, in this embodiment, the motor temperature compensation control circuit is a voltage regulation circuit, which can be mainly divided into a power conversion circuit and a motor control circuit, and the power conversion circuit regulates the power supply voltage of the motor control circuit, so as to avoid the situation that the inductance of the vibrator motor M is weakened when the application environment temperature is reduced.
In this embodiment, the feedback voltage fed back to the boost converter U1 by the voltage feedback component 1 changes according to the change of the application environment temperature, and the boost converter U1 adjusts the power supply voltage of the motor control circuit 2 according to the obtained feedback voltage. Therefore, the problem that vibration inductance obviously decreases under the condition that the temperature of an application environment is low when the motor is driven by using the same control method due to the fact that the fluidity of gear oil in the motor is reduced along with the reduction of the temperature of the application environment in the vibrator motor control circuit in the prior art is solved.
The utility model discloses a possible embodiment, voltage feedback subassembly 1 includes first feedback resistance R1, second feedback resistance R2 and third feedback resistance RT1, boost converter U1's output with first feedback resistance R1's one end third feedback resistance RT 1's one end electrical connection, boost converter U1's output voltage feedback end with first feedback resistance R1's the other end third feedback resistance RT 1's the other end second feedback resistance R2's one end electrical connection, second feedback resistance R2's other end ground connection.
Specifically, in the present embodiment, the third feedback resistor RT1 may be a thermistor.
In the embodiment, in order to realize the temperature compensation of the vibrator motor M, the thermistor is introduced into the motor temperature compensation control circuit, and the thermistor is a type of sensitive element and is divided into a positive temperature coefficient thermistor and a negative temperature coefficient thermistor according to different temperature coefficients; thermistors are typically temperature sensitive and exhibit different resistance values at different temperatures. By utilizing the characteristic of the thermistor, when the temperature of an application environment rises, the resistance value of the thermistor is reduced, and the feedback voltage rises; when the ambient temperature decreases, the resistance value of the thermistor increases, and the feedback voltage decreases. It should be noted that, in other embodiments, other types of feedback resistors may also be used, which is not limited herein, but these solutions are all within the protection scope of the present invention.
In the utility model discloses a possible embodiment still includes first electric capacity C1, the one end of first electric capacity C1 with power input VIN electrical connection, the other end ground connection of first electric capacity C1. The boost converter further comprises a second capacitor C2, one end of the second capacitor C2 is electrically connected with the output end of the boost converter U1, and the other end of the second capacitor C2 is grounded.
Specifically, in this embodiment, the first capacitor C1 and the second capacitor C2 are filter capacitors, and the filter capacitors are energy storage devices installed at two ends of the rectifier circuit to reduce the ripple factor of the ac pulse and improve the high-efficiency smooth dc output. The first capacitor C1 and the second capacitor C2 are used in the motor temperature compensation control circuit to filter out ac components, so that the output dc is smoother.
In one possible embodiment of the present invention, the boost converter U1 may be an SGM6x series chip.
Specifically, in this embodiment, the SGM6x series chip is a high-power-density fully-integrated synchronous boost converter, which is commonly used in portable POS terminals, bluetooth speakers, electronic cigarettes, lightning interfaces, and fast-charging mobile power devices, and is very suitable for providing an efficient and flexible solution for portable devices.
In this embodiment, the input voltage passes through the main inductor L1, the bootstrap capacitor C2, the boost converter U1, and the voltage feedback component 1 from the power input terminal VIN, and finally the output voltage VCC is used for supplying power to the dc oscillator motor. The calculation formula of the output voltage VCC is as follows: VCC = VFB (1 + (R1 | | RT 1)/R2), where VFB is the feedback voltage of the power supply IC, and R1| | RT1 represents the resistance value after R1 and RT1 are connected in parallel; in the above formula, when the third feedback resistor RT1 is decreased, the parallel resistor R1| | | RT1 is also decreased, and the output voltage VCC is correspondingly decreased. The value of the output voltage VCC is therefore positively correlated with the value of the third feedback resistor RT 1. An appropriate negative temperature coefficient thermistor is selected as the third feedback resistor RT1, so that negative correlation between the output voltage VCC and the temperature can be realized, namely, the lower the temperature is, the higher the output voltage VCC is, and the higher the motor rotating speed is. When the ambient temperature rises, the resistance value of the thermistor is reduced, the feedback voltage rises, and the output voltage of the boost converter U1 is reduced, so that the power supply voltage of the motor is reduced, the rotating speed of the motor is reduced, and the vibration sense is weakened; when the ambient temperature is reduced, the resistance value of the thermistor is increased, the feedback voltage is reduced, the output voltage of the boost converter U1 is increased, and therefore the power supply voltage of the motor is increased, the rotating speed of the motor is increased, and the vibration sense is enhanced.
In a possible embodiment of the present invention, the motor control circuit 2 includes a diode D and a switch tube Q, the anode of the diode D is electrically connected to the output end of the boost converter U1, the cathode of the diode D is electrically connected to the second end of the switch tube Q, the first end of the switch tube Q is grounded, the second end of the switch tube Q is electrically connected to the cathode of the vibrator motor M, and the control end of the switch tube Q is electrically connected to the output end of the controller MCU.
Specifically, in this embodiment, the switching tube Q may be an NMOS tube, the control end of the switching tube Q is the gate of the NMOS tube, the first end of the switching tube Q is the source of the NMOS tube, and the second end of the switching tube Q is the drain of the NMOS tube.
In the present embodiment, the diode D is used to absorb the reverse current of the vibrator motor M; the NMOS tube is composed of three N-type semiconductors and three P-type semiconductors, wherein the P-type semiconductor is arranged in the middle, and the two N-type semiconductors are arranged on two sides; the NMOS tube has the main functions of current amplification and switching, amplifies weak signals into electric signals with large amplitude values, and is also used as a contactless switch. As for the NMOS tube, as long as the base voltage is higher than the emitter voltage by more than 0.7V, the emitter and the collector can be conducted, the base is taken as a control end, the high level is conducted, and the low level is cut off; therefore, the on-off of the switching tube can be realized by only controlling the voltage of the base electrode. It should be noted that, in other embodiments, other types of switch tubes may also be used, which is not specifically limited herein, but these schemes are all within the protection scope of the present invention.
In summary, the feedback control of the thermistor is introduced into the motor temperature compensation control circuit, which mainly performs automatic compensation of the rotation speed of the motor in a voltage control manner, and the thermistor is used to adjust the power supply voltage of the motor through the resistance value change of the thermistor at different environmental temperatures, so as to change the rotation speed of the dc oscillator motor and compensate the weakening of the vibration sensation of the motor in a low-temperature environment; the power supply voltage of the motor is adjusted according to the environment temperature, so that the rotating speed of the motor is adjusted, and the vibration inductance of the motor is adjusted; the whole circuit does not need software participation, is purely controlled by hardware, uses few components, has reliable functions, simple circuit structure, easy realization and low device cost. The problem of in practical application, the vibration sense that appears when oscillator motor M reduces along with ambient temperature obviously descends is solved.
Referring to fig. 3, a second embodiment of the present invention provides an electronic device, including a controller MCU and a motor temperature compensation control circuit as described above, wherein the enable terminal of the boost converter U1 is electrically connected to the output terminal of the controller MCU, and the control terminal of the motor control circuit 2 is electrically connected to the output terminal of the controller MCU.
Above only the utility model discloses a preferred embodiment, the utility model discloses a scope not only limits in above-mentioned embodiment, and the fan belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope.
Claims (10)
1. A motor temperature compensation control circuit is characterized by comprising a power supply input end, a voltage conversion circuit, a voltage feedback component and a motor control circuit;
the power supply input end is electrically connected with a first end of the voltage conversion circuit, an output voltage feedback end of the voltage conversion circuit is electrically connected with a first end of the voltage feedback assembly, an output end of the voltage conversion circuit is electrically connected with a second end of the voltage feedback assembly and an input end of the motor control circuit, an enable end of the voltage conversion circuit is electrically connected with an output end of the controller, an output end of the voltage conversion circuit is electrically connected with an anode of the vibrator motor, and a control end of the motor control circuit is electrically connected with an output end of the controller;
the voltage feedback component is configured to adjust the magnitude of the feedback voltage of the voltage conversion circuit according to the current environment temperature;
the voltage conversion circuit is configured to adjust the magnitude of the supply voltage of the motor control circuit according to the current feedback voltage.
2. The motor temperature compensation control circuit according to claim 1, wherein the voltage conversion circuit comprises a main inductor, a bootstrap capacitor, and a boost converter, the power input end is electrically connected to one end of the main inductor, the other end of the main inductor is electrically connected to one end of the bootstrap capacitor and a switch control end of the boost converter, the other end of the bootstrap capacitor is electrically connected to a start end of the boost converter, an output voltage feedback end of the boost converter is electrically connected to a first end of the voltage feedback component, an output end of the boost converter is electrically connected to a second end of the voltage feedback component and an input end of the motor control circuit, a ground end of the boost converter is grounded, an enable end of the boost converter is electrically connected to an output end of the controller, and an output end of the boost converter is electrically connected to a positive electrode of the motor.
3. The motor temperature compensation control circuit according to claim 2, wherein the voltage feedback component includes a first feedback resistor, a second feedback resistor, and a third feedback resistor, the output terminal of the boost converter is electrically connected to one end of the first feedback resistor and one end of the third feedback resistor, the output voltage feedback terminal of the boost converter is electrically connected to the other end of the first feedback resistor, the other end of the third feedback resistor, and one end of the second feedback resistor, and the other end of the second feedback resistor is grounded.
4. The motor temperature compensation control circuit of claim 3, wherein the third feedback resistor is a thermistor.
5. The motor temperature compensation control circuit of claim 1, further comprising a first capacitor, one end of the first capacitor being electrically connected to the power input, the other end of the first capacitor being connected to ground.
6. The motor temperature compensation control circuit of claim 2, further comprising a second capacitor, one end of the second capacitor being electrically connected to the output of the boost converter, the other end of the second capacitor being connected to ground.
7. The motor temperature compensation control circuit of claim 2, wherein the boost converter is an SGM6x series chip.
8. The motor temperature compensation control circuit of claim 2, wherein the motor control circuit comprises a diode and a switching tube, wherein an anode of the diode is electrically connected to the output terminal of the boost converter, a cathode of the diode is electrically connected to a second terminal of the switching tube, a first terminal of the switching tube is grounded, the second terminal of the switching tube is electrically connected to a cathode of the motor, and a control terminal of the switching tube is electrically connected to the output terminal of the controller.
9. The motor temperature compensation control circuit of claim 8, wherein the switch transistor is an NMOS transistor, the control terminal of the switch transistor is the gate of the NMOS transistor, the first terminal of the switch transistor is the source of the NMOS transistor, and the second terminal of the switch transistor is the drain of the NMOS transistor.
10. An electronic apparatus comprising a controller, and the motor temperature compensation control circuit according to any one of claims 1 to 9, wherein an enable terminal of the boost converter of the voltage conversion circuit is electrically connected to an output terminal of the controller, and a control terminal of the motor control circuit is electrically connected to the output terminal of the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221590910.6U CN218276511U (en) | 2022-06-24 | 2022-06-24 | Electronic equipment and motor temperature compensation control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221590910.6U CN218276511U (en) | 2022-06-24 | 2022-06-24 | Electronic equipment and motor temperature compensation control circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218276511U true CN218276511U (en) | 2023-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202221590910.6U Active CN218276511U (en) | 2022-06-24 | 2022-06-24 | Electronic equipment and motor temperature compensation control circuit thereof |
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| Country | Link |
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| CN (1) | CN218276511U (en) |
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- 2022-06-24 CN CN202221590910.6U patent/CN218276511U/en active Active
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