CN220717940U - Mini electric circular saw controller - Google Patents

Abstract

The utility model discloses a mini electric circular saw controller which comprises a power supply module, a control module, a temperature sampling module, a voltage detection module, a power-on detection module, an LED display module, a power module and a back electromotive force module, wherein the temperature sampling module, the power-on detection module, the LED display module, the power module and the control module are connected, the voltage detection module comprises a strong electric signal detection module and a bus voltage detection module, the power-on detection module and the LED display module are connected to the power supply module, the power supply module is used for supplying power and independently controlling the on-off time of an LED lamp after the LED lamp is turned on and off, the implementation of the utility model realizes accurate temperature detection and intervention control, and the back electromotive force voltage of U, V and W phases is compared with the neutral point Nbmf voltage to find the zero crossing point event of the induced electromotive force of each phase, so that a reversing point is obtained, and the mini electric circular saw controller has a certain use value and popularization value.

Description

Mini electric circular saw controller

Technical Field

The utility model relates to the technical field of electric circular saws, in particular to a mini electric circular saw controller.

Background

The electric circular saw is a tool which uses a single-phase series motor as power and then drives a circular saw blade to carry out sawing operation through a transmission mechanism, and has the characteristics of safety, reliability, high working efficiency and the like. The electric circular saw adopts a lifting and climbing type appearance structure and mainly comprises a motor, a reduction gearbox, a protective cover, an adjusting mechanism, a bottom plate, a handle, a switch, a plug which can not be connected again, a circular saw blade and the like.

The power of the motor is changed according to the different gear switching requirements of the use requirement, when the power of the motor is increased, the temperature is gradually increased, the motor or the controller cannot be accurately detected and controlled in an intervening manner along with the gradual temperature increase, the damage of the motor or the controller is easily caused, when the internal resistor and capacitor is open-circuited or short-circuited, counter potential waveforms of the motor are unbalanced, zero crossing events of induced electromotive force of each phase cannot be acquired, the motor is not operated, and the limitation is relatively large.

In view of the foregoing, there is a need for a miniature electric circular saw controller that overcomes the shortcomings of the prior art.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a mini electric circular saw controller, which aims to solve the problem that the motor cannot work due to unbalanced counter potential waveforms of the motor because the temperature cannot be accurately detected and is subjected to intervention control.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a mini electric circular saw controller, includes power module, control module, temperature sampling module, voltage detection module, goes up electric detection module, LED display module, power module, back electromotive force module, temperature sampling module, go up electric detection module, LED display module, power module and control module are connected, voltage detection module includes strong electric signal detection module and busbar voltage detection module, go up electric detection module and LED display module connect in power module, power module is used for providing the power and the time that the individual control LED lamp was on and is loosen the back lamp and go out, control module is used for realizing multiple detection function and control mini electric circular saw start-stop from taking the predrive module, temperature sampling module is used for realizing comparatively accurate temperature detection, voltage detection module is used for detecting strong electric signal and busbar voltage, it is used for preventing that the controller from powering up the direct operation of secondary after outage, LED display module is used for feeding back the problem, power module is used for driving control by MCU pin output level and carries out switch control to MOS, back electromotive force module is used for detecting U, V looks midpoint voltage and the voltage of every back electromotive force voltage phase emf phase commutation voltage phase emf and nbf phase commutation point phase position to find out. The voltage detection module can detect the strong electric signal and the bus voltage, so that whether the strong electric switch lines K1 and K2 are closed or not is obtained, the range of the detected power supply voltage is accurate, and meanwhile, zero crossing point events of induced electromotive force of each phase are found by continuously detecting back electromotive force voltages of U, V and W phases and comparing the back electromotive force voltages with midpoint Nbmf voltage, so that a reversing point is obtained.

Preferably, the control module includes a chip U2, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a diode D8, a diode D9, and a resistor R1, where the capacitor C1, the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7, the diode D7, the capacitor D8, and the diode D9 are all connected with the chip U2, one end of the resistor R1 is connected with the capacitor C2, and the other end of the resistor R1 is connected with the diode D7, the diode D8, and the diode D9.

Preferably, the temperature sampling module includes an on-state resistor RMOS1, an on-state resistor RMOS2, a thermistor MOS NTC, and a filter capacitor CMOS1, where the on-state resistor RMOS1 and the on-state resistor RMOS2 are used for voltage division, and the filter capacitor CMOS1 is used for performing filtering processing on a voltage to be input into the control module.

Preferably, the strong electric signal detection module comprises a switch line K3, a resistor RV4, a MODE selection switch MODE and a filter capacitor CV2, wherein the strong electric signal detection module is used for detecting whether the strong electric switch line is closed, and the resistor RV3 and the resistor RV4 are connected with the filter capacitor CV 2;

the bus voltage detection module comprises a voltage input end VIN, a resistor RV1, a resistor RV2, a MODE selection switch MODE and a filter capacitor CV1, wherein the resistor RV1 and the resistor RV2 are connected with the filter capacitor CV 1.

Preferably, the LED display module comprises an LED lamp interface module, a resistor RL1, a resistor RL2, a resistor RL3 and a triode QL1, wherein the resistor RL1 and the triode QL1 are connected with the LED lamp interface module, and the resistor RL2 and the resistor RL3 are connected with the triode QL 1.

Preferably, the back electromotive force module includes RN3, RN4, RN5, RN6, RN8, RN9, RN11, RN12, RN13, CN2, CN3, CN4, wbemf, vbemf, ubemf and Nbemf, the RN3, RN4, RN5, CN2 are connected with Wbemf, the RN6, RN8, RN9, CN3 are connected with Vbemf, the RN11, RN12, RN13, CN4 are connected with Ubemf, and the RN3, RN6 and RN11 are all connected with Nbemf.

The utility model has the beneficial effects that:

1. according to the utility model, the LED lamp can be independently controlled to be on through the arranged LED display module, the lamp is turned off within a certain time after the LED lamp is released, and when the MCU is powered on, a high level is output through the IO port POWER to maintain normal POWER supply of the module, so that the LED lamp is turned on for a long time; the chip is provided with a pre-driving module, a bootstrap diode and a bootstrap capacitor are required to be matched outside, and a parameter module matched fixedly is converted into a digital quantity through an ADC (analog-to-digital converter) and then is compared with a set value, so that various detection functions are realized;

2. according to the utility model, the NTC is placed close to the MOS through the set temperature sampling module, the MOS has different temperatures in operation, the voltage after the RMOS1 and the RMOS2 are divided and the voltage after the CMOS1 is filtered is input to the MCU, the voltage is converted into digital quantity through the ADC and is compared with a set value to realize a more accurate temperature detection function, and when the temperature is detected to be not within the range value, the controller immediately stops working;

3. in the utility model, the problem of which part is determined by observing the flicker times of the lamp, and the MOS is controlled to be switched by the output level of the MCU pin through drive control so as to meet the working requirement of the motor;

4. in the utility model, the zero crossing point event of the induced electromotive force of each phase is found by continuously detecting the back electromotive force voltages of U, V and W phases and comparing the back electromotive force voltages with the midpoint Nbmf voltage, thereby obtaining the reversing point.

Drawings

Fig. 1 is a schematic block diagram of the structure of the present utility model.

Fig. 2 is a schematic diagram of a power module circuit structure according to the present utility model.

Fig. 3 is a schematic circuit diagram of a control module according to the present utility model.

Fig. 4 is a schematic circuit diagram of a temperature sampling module according to the present utility model.

Fig. 5 is a schematic circuit diagram of a strong electric signal detection module according to the present utility model.

Fig. 6 is a schematic circuit diagram of a bus voltage detection module according to the present utility model.

Fig. 7 is a schematic circuit diagram of a power-on detection module according to the present utility model.

Fig. 8 is a schematic circuit diagram of an LED display module according to the present utility model.

Fig. 9 is a schematic diagram of a power module circuit structure according to the present utility model.

Fig. 10 is a schematic circuit diagram of a back electromotive force module according to the present utility model.

Detailed Description

In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, 2, 7 and 9, a mini electric circular saw controller comprises a power module, a control module, a temperature sampling module, a voltage detection module, a power-on detection module, an LED display module, a power module and a back electromotive force module, wherein the temperature sampling module, the power-on detection module, the LED display module, the power module and the control module are connected, the voltage detection module comprises a strong electric signal detection module and a bus voltage detection module, the power-on detection module and the LED display module are connected to the power module, the power module is used for providing power and independently controlling the time of the LED lamp to turn on and turn off, the control module is used for realizing various detection functions and controlling the mini electric circular saw to turn on and off, the temperature sampling module is used for realizing accurate temperature detection, the voltage detection module is used for detecting strong electric signals and bus voltage, the power-on detection module is used for preventing the controller from being directly electrified for a second time after power-off, the LED display module is used for feeding back to run problems, the power module is used for driving and controlling output levels by an MCU pin and carrying out switch control on-off, the voltage detection module is used for detecting U, V, the back electromotive force voltage of W phase is compared with midpoint voltage Nbf voltage and each phase electromotive force induced by an emf voltage is found out zero crossing event, and zero crossing event is obtained.

As shown in fig. 3, the control module includes a chip U2, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a diode D8, a diode D9, and a resistor R1, where the capacitor C1, the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7, the diode D8, and the diode D9 are all connected to the chip U2, one end of the resistor R1 is connected to the capacitor C2, and the other end of the resistor R1 is connected to the diode D7, the diode D8, and the diode D9.

As shown in fig. 4, the temperature sampling module includes an on-state resistor RMOS1, an on-state resistor RMOS2, a thermistor MOS NTC, and a filter capacitor CMOS1, where the on-state resistor RMOS1 and the on-state resistor RMOS2 are used for dividing a voltage, and the filter capacitor CMOS1 is used for performing filtering processing on the voltage to be input into the control module; the temperature sampling module is used for enabling the NTC to be close to the MOS, different temperatures exist in the MOS during operation, voltage after the RMOS1 and the RMOS2 are divided and filtered by the CMOS1 is input to the MCU, the voltage is converted into digital quantity through the ADC, the digital quantity is compared with a set value to realize the temperature detection function, and when the temperature is detected to be not within the range value, the controller stops working.

As shown in fig. 5 and 6, the strong electric signal detection module includes a switch line K3, a resistor RV4, a MODE selection switch MODE and a filter capacitor CV2, where the strong electric signal detection module is used to detect whether the strong electric switch line is closed, and the resistor RV3 and the resistor RV4 are connected with the filter capacitor CV 2; the bus voltage detection module comprises a voltage input end VIN, a resistor RV1, a resistor RV2, a MODE selection switch MODE and a filter capacitor CV1, wherein the resistor RV1 and the resistor RV2 are connected with the filter capacitor CV 1.

As shown in fig. 8, the LED display module includes an LED lamp interface module, a resistor RL1, a resistor RL2, a resistor RL3, and a triode QL1, where the resistor RL1 and the triode QL1 are connected with the LED lamp interface module, and the resistor RL2 and the resistor RL3 are connected with the triode QL 1; the LED lamp is controlled to be on independently through the LED display module, the lamp is turned off within a certain time after the LED lamp is released, and when the MCU is powered on, a high level is output through the IO port POWER to maintain normal POWER supply of the module, so that the LED lamp is turned on for a long time; the chip is provided with a pre-driving module, an externally matched bootstrap diode and a bootstrap capacitor are needed, a parameter module matched fixedly is converted into a digital quantity through an ADC (analog-to-digital converter), and then the digital quantity is compared with a set value to realize various detection functions, the problem of which part is determined by observing the flicker times of a lamp is solved, the output level of an MCU pin is controlled through driving, and MOS is controlled in a switching mode, so that the working requirement of a motor is met.

As shown in fig. 10, the back electromotive force module includes RN3, RN4, RN5, RN6, RN8, RN9, RN11, RN12, RN13, CN2, CN3, CN4, wbemf, vbemf, ubemf and Nbemf, RN3, RN4, RN5, CN2 are connected with Wbemf, RN6, RN8, RN9, CN3 are connected with Vbemf, RN11, RN12, RN13, CN4 are connected with Ubemf, RN3, RN6 and RN11 are all connected with Nbemf, and by continuously detecting the back electromotive force voltages of the U, V, W phases and comparing with the midpoint Nbemf voltage, a zero crossing event of the induced electromotive force of each phase is found, thereby obtaining a commutation point.

The working principle of the utility model is as follows: the strong electric signal detection and bus voltage detection are carried out through the voltage detection module, and the strong electric signal detection specifically comprises: the busbar voltage is divided by RV3 and RV4 resistors, filtered by CV2 and then transmitted to MCU, converted into digital quantity by ADC and then compared with a set value, and whether the strong current switch lines K1 and K2 are closed or not is detected; the bus voltage detection specifically comprises the following steps: the bus voltage is divided by RV1 and RV2 resistors, filtered by CV1 and then fed into MCU, converted into digital quantity by ADC and compared with a set value, the range of the detected power supply voltage is 13.5V-24V, when the controller operates, the voltage exceeds the range, the controller stops working, the miniature electric circular saw enables NTC to be close to MOS through a temperature sampling module during working, MOS has different temperatures during working, voltage after being divided by RMOS1 and RMOS2 and filtered by CMOS1 is input into MCU, the voltage after being converted into digital quantity by ADC is compared with the set value to realize a more accurate temperature detection function, and when the detected temperature is not within the range, the controller stops working immediately; and by continuously detecting the back electromotive force voltages of the U, V and W phases and comparing the back electromotive force voltages with the midpoint Nbmf voltage, the zero crossing point event of the induced electromotive force of each phase is found, so that a reversing point is obtained, and the problem that the motor does not work due to the fact that the zero crossing point event of the induced electromotive force of each phase cannot be obtained is avoided.

It should be noted that the description of the present utility model and the accompanying drawings illustrate preferred embodiments of the present utility model, but the present utility model may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are not to be construed as additional limitations of the utility model, but are provided for a more thorough understanding of the present utility model. The above-described features are continuously combined with each other to form various embodiments not listed above, and are considered to be the scope of the present utility model described in the specification; further, modifications and variations of the present utility model may be apparent to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be included within the scope of this utility model as defined in the appended claims.

Claims (6)

1. The utility model provides a mini electric circular saw controller, its characterized in that includes power module, control module, temperature sampling module, voltage detection module, goes up electric detection module, LED display module, power module, back electromotive force module, temperature sampling module, go up electric detection module, LED display module, power module and control module connect, voltage detection module includes strong electric signal detection module and busbar voltage detection module, goes up electric detection module and LED display module connect in power module, power module is used for providing the power and controls the time that the LED lamp was on and is loosen the back light and go out alone, control module is used for realizing multiple detection function and control mini electric circular saw start-stop from taking the predrive module, temperature sampling module is used for realizing comparatively accurate temperature detection, voltage detection module is used for detecting strong electric signal and busbar voltage, it is used for preventing that the controller from cutting off the back secondary and goes up electric direct operation, LED display module is used for feeding back the operational problem, power module is used for driving control by MOS output level and carries out switch control to the MOS, power module is used for detecting the time of U, and the voltage of the phase is compared with the voltage of Nbf of the motor phase, and obtains every back electromotive force's voltage of the motor phase, and the voltage of Nbf is compared to find the point of the reverse voltage of the phase position of the motor.

2. The mini electric circular saw controller according to claim 1, wherein the control module comprises a chip U2, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a diode D8, a diode D9 and a resistor R1, wherein the capacitor C1, the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7 and the diodes D7, D8 and D9 are all connected with the chip U2, one end of the resistor R1 is connected with the capacitor C2, and the other end of the resistor R1 is connected with the diode D7, the diode D8 and the diode D9.

3. The mini electric circular saw controller according to claim 1, wherein the temperature sampling module comprises an on-state resistor RMOS1, an on-state resistor RMOS2, a thermistor MOS NTC and a filter capacitor CMOS1, the on-state resistor RMOS1 and the on-state resistor RMOS2 being used for dividing a voltage to be inputted to the control module, and the filter capacitor CMOS1 being used for filtering the voltage to be inputted to the control module.

4. The mini electric circular saw controller according to claim 1, wherein the strong electric signal detection module comprises a switch line K3, a resistor RV4, a MODE selection switch MODE and a filter capacitor CV2, the strong electric signal detection module is configured to detect whether the strong electric switch line is closed, and the resistor RV3 and the resistor RV4 are connected with the filter capacitor CV 2;

the bus voltage detection module comprises a voltage input end VIN, a resistor RV1, a resistor RV2, a MODE selection switch MODE and a filter capacitor CV1, and the resistor RV1 and the resistor RV2 are connected with the filter capacitor CV 1.

5. The mini electric circular saw controller according to claim 1, wherein the LED display module comprises an LED lamp interface module, a resistor RL1, a resistor RL2, a resistor RL3 and a triode QL1, the resistor RL1 and the triode QL1 are connected with the LED lamp interface module, and the resistor RL2 and the resistor RL3 are connected with the triode QL 1.

6. The mini electric circular saw controller according to claim 1, wherein the back electromotive force module comprises RN3, RN4, RN5, RN6, RN8, RN9, RN11, RN12, RN13, CN2, CN3, CN4, wbemf, vbemf, ubemf and Nbemf, the RN3, RN4, RN5, CN2 being connected to Wbemf, the RN6, RN8, RN9, CN3 being connected to Vbemf, the RN11, RN12, RN13, CN4 being connected to Ubemf, the RN3, RN6 and RN11 being connected to Nbemf.