CN217238191U

CN217238191U - Motor drive current detection circuit of massage device

Info

Publication number: CN217238191U
Application number: CN202220310890.6U
Authority: CN
Inventors: 李荣升
Original assignee: Ningbo Binghang Technology Group Co ltd
Current assignee: Ningbo Binghang Technology Group Co ltd
Priority date: 2022-02-16
Filing date: 2022-02-16
Publication date: 2022-08-19
Anticipated expiration: 2032-02-16

Abstract

The application provides a massage device's motor drive current detection circuitry, including being used for supplying current with the power supply major loop of driving motor work to the motor, and be connected to power supply major loop, be arranged in detecting the sampling detection branch road of current size in the power supply major loop, wherein, power supply major loop is including the fuse that can reset, motor and the sampling resistor of establishing ties, the fuse that can reset is in resistance value in the power supply major loop is variable setting, the sampling detection branch road detects sampling resistor is in the current detection of partial pressure in the power supply major loop in order to realize the power supply major loop. The application provides a motor drive current detection circuit of massage device, its circuit is simple effective, can reduce cost.

Description

Motor drive current detection circuit of massage device

Technical Field

The utility model relates to a circuit control technical field of massage equipment especially relates to a motor drive current detection circuitry of massage device.

Background

A massage chair is a device which can massage a plurality of parts of the whole body of a user. The user sits or semi-lies in the massage chair in a comfortable posture, the massage chair is powered on to start the massage function, and the massage of manipulations such as pressing, beating, kneading and the like can be carried out on the back, the neck, the four limbs and the like according to the selection of the user. The massage manipulation is usually realized by a motor driving a specific massage component to perform a set motion, and thus, it is very important for the control and status detection of the motor. In the prior art, a motor driving chip with a current detection function is usually used to realize the control and state detection of a motor, so that the cost of the product is increased. Particularly, under the situation of chip shortage faced at the present stage, it is of great significance to develop a scheme with low cost which can replace the existing driving chip.

In view of the above, there is a need to provide a new technical solution to overcome the problems in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a motor drive current detection circuit of massage device, its circuit is simple effective, can reduce cost.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a massage device's motor drive current detection circuitry, includes and is used for supplying current with the power supply major loop of driving motor work to the motor, and is connected to power supply major loop, the sampling detection branch road that is arranged in detecting power supply major loop electric current size, wherein, power supply major loop is including the fuse that can reset, motor and the sampling resistor of establishing ties, the fuse that can reset is in resistance value in the power supply major loop is variable setting, the sampling detection branch road detects the sampling resistor is in the current detection of voltage division in the power supply major loop is in order to realize power supply major loop.

Optionally, the power supply main loop includes a switch tube, the drain electrode of the switch tube is connected to one end of the motor, the source electrode of the switch tube is connected to one end of the sampling resistor, the other end of the sampling resistor is grounded, and the grid electrode of the switch tube is connected to the signal output port of the control board.

Optionally, the switching tube is a MOSFET configured as a speed regulation switch capable of regulating the rotation speed of the motor.

Optionally, the power supply main loop further includes a pull-down resistor, one end of the pull-down resistor is connected to the gate of the switching tube, and the other end of the pull-down resistor is grounded.

Optionally, the power supply main circuit further includes a diode, an anode of the diode is connected to the drain of the switching tube and one end of the motor, and a cathode of the diode is connected to the other end of the motor.

Optionally, one end of the resettable fuse is connected with a power supply VCC, and the other end of the resettable fuse is connected with the cathode of the diode and the other end of the motor.

Optionally, the resettable fuse is a PTC resistor.

Optionally, the sampling detection branch comprises a current-limiting resistor, one end of the current-limiting resistor is connected between the sampling resistor and the source electrode of the switching tube, and the other end of the current-limiting resistor is connected to the AD sampling port of the control board.

Optionally, the sampling detection branch further includes a bypass capacitor circuit, and two ends of the bypass capacitor circuit are connected to two ends of the current limiting resistor.

Optionally, the bypass capacitor circuit includes a first capacitor and a second capacitor, the first capacitor is connected between one end of the current-limiting resistor and ground, and the second capacitor is connected between the other end of the current-limiting resistor and ground.

The utility model provides a motor drive current detection circuit of massage device, power supply major loop include but the reset fuse, motor and the sampling resistor of series connection, but the reset fuse is in the resistance value of power supply major loop is variable setting, and the sampling detects the branch road and detects the partial pressure of sampling resistor in the power supply major loop in order to realize the current detection of power supply major loop, has the advantages of circuit is simple, and software processing is convenient, and overall cost is low; but reset fuse when the motor appears stifled commentaries on classics etc. unusually, resistance sharply increases in the twinkling of an eye, not only can make the partial pressure produce the change to be convenient for quick, accurate measuring current, also can make the electric current in the power supply major loop reduce to the safe value rapidly simultaneously, the security of reinforcing circuit.

Drawings

To illustrate the technical solutions of the embodiments of the present invention more clearly, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description only relate to some embodiments of the present invention, and are not intended to limit the present invention.

Fig. 1 is a circuit diagram of an embodiment of a motor driving current detection circuit of a massage device according to the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used only to indicate relative positional relationships that may change when the absolute position of an object being described changes, and are merely for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.

Referring to fig. 1, the present invention provides a motor driving current detection circuit for a massage device. The massage device can be a massage chair, a massage bed, other massage equipment, or a device applied to the massage chair, the massage bed or other massage equipment and used for realizing one or more massage manipulations. The motor driving current detection circuit of the massage device comprises a power supply main loop 1 and a sampling detection branch circuit 2, wherein the power supply main loop 1 is used for supplying current to a motor so as to drive the motor to work, and the sampling detection branch circuit 2 is connected to the power supply main loop 1 and is used for detecting the current in the power supply main loop 1. The power supply main circuit 1 includes a resettable fuse P1, a motor (not shown) and a sampling resistor R3 connected in series. The resistance value of the resettable fuse P1 in the power supply main loop 1 is variably set, and the sampling detection branch 2 detects the voltage division of the sampling resistor R3 in the power supply main loop 1 to realize the current detection of the power supply main loop 1.

As shown in fig. 1, in an embodiment, the main power supply loop 1 includes a current loop formed by connecting a power supply VCC, a resettable fuse P1, a connection terminal CON1, a motor, a switch tube Q1, a sampling resistor R3, and a ground point GND.

The power supply VCC is a power supply for driving the motor to work, and in this embodiment, is set to be a 24V dc power supply; it will be appreciated that in other embodiments, it may be provided with other voltage levels of direct or alternating current, as desired.

One end of the resettable fuse P1 is connected to the power supply VCC, and the other end is connected to one end of the motor through one end of a connection terminal CON 1. The resettable fuse is a Positive Temperature Coefficient (PTC) resistor, the resistance value of the resettable fuse P1 in the power supply main loop 1 is a variable setting finger, when the circuit works normally, the Temperature of the resettable fuse P1 is close to room Temperature, the resistance is very small, and the resettable fuse is connected in series in the power supply main loop 1 and cannot prevent current from passing through; when the motor or the main power supply loop 1 is abnormal and the current of the motor or the main power supply loop 1 exceeds the tripping current of the resettable fuse P1, the resistance of the resettable fuse P1 is suddenly increased, so that the current in the main power supply loop 1 is rapidly reduced to ensure the circuit safety. In the embodiment, the resettable fuse P1 is, for example, a self-recovery fuse with model number BK 60-200.

The connection terminal CON1 includes an input terminal and an output terminal, which are connected to both connection terminals of the motor to realize the flow of current into and out of the motor. In this embodiment, the connection terminal CON1 is a plastic connection terminal, and is connected to two ends of the load coil of the motor in a detachable manner such as plugging or screwing connection. Therefore, the power supply main loop 1 is connected with the motor in an easy-to-detach mode, and the connection is more convenient. In an embodiment, the connection terminal CON1 is, for example, a terminal of type VH-2A.

The switching tube Q1 is a MOSFET, i.e., a metal-oxide semiconductor field effect transistor, and is configured to control the on/off of the power supply main loop 1 and a speed regulation switch capable of regulating the rotation speed of the motor. The drain of the switching tube Q1 is connected to one end of the motor through the output terminal of the connection terminal CON1, the source of the switching tube Q1 is connected to one end of the sampling resistor R3, the other end of the sampling resistor R3 is grounded to GND, and the gate of the switching tube Q1 is connected to a signal output port of the control board. In one embodiment, the signal output port of the control board outputs a PWM signal, and the PWM signal is transmitted to the gate of the switching tube Q1 through the resistor R1. In one embodiment, the switching transistor Q1 is an N-channel MOSFET of type NCE6050 KA. Further, the power supply main loop 1 further includes a pull-down resistor R2, and the pull-down resistor R2 is used for ensuring stability of logic level. One end of the pull-down resistor R2 is connected to the gate of the switch tube Q1, and the other end of the pull-down resistor R2 is grounded GND.

The main power supply loop 1 further comprises a diode D1, the diode D1 is connected in parallel with the motor through a connection terminal CON1, that is, the anode of the diode D1 is connected with the drain of the switching tube Q1 and one end of the motor, and the cathode of the diode D1 is connected with the other end of the motor. In this embodiment, the diode D1 is an RS1M clamp diode, which is used to absorb the reverse voltage generated by the load coil of the motor, so as to ensure the stability of the circuit.

The working process of the power supply main loop 1 is as follows: when the signal output port of the control panel outputs a high-level PWM signal, the high-level PWM signal passes through R1 to the grid electrode of the switch tube Q1, the switch tube Q1 is conducted, the circuit between the power supply VCC and the grounding point GND is conducted, and the motor is connected to the circuit and works by power.

As shown in fig. 1, the sampling detection branch 2 is connected to the main power supply loop 1 for detecting the current thereof. The sampling detection branch circuit 2 comprises a current-limiting resistor R4, one end of the current-limiting resistor R4 is connected between the sampling resistor R3 and the source electrode of the switch tube Q1, and the other end of the current-limiting resistor R4 is connected to an AD sampling port of a control board. The current limiting resistor R4 is used to prevent the sampling voltage or current from being too high. The sampling detection branch circuit 2 further comprises a bypass capacitor circuit, and two ends of the bypass capacitor circuit are connected with two ends of the current limiting resistor R4. The bypass capacitor circuit is used for filtering higher harmonic components possibly contained in the sampling signal and enhancing the stability and reliability of sampling. Optionally, the bypass capacitor circuit includes a first capacitor C1 and a second capacitor C2, the first capacitor C1 is connected between one end of the current-limiting resistor R4 and a ground point GND, and the second capacitor C2 is connected between the other end of the current-limiting resistor R4 and the ground point GND.

The working process of the sampling detection branch circuit 2 is as follows: in the working process of the power supply main loop 1, the current forms a loop, and due to the voltage division formed by the sampling resistor R3 in the power supply main loop 1, the connection point of the sampling detection branch 2 and the power supply main loop 1, that is, the sampling point has voltage, and the voltage value at the sampling point is transmitted to the AD sampling port of the control board through the current limiting resistor R4 to realize sampling detection.

According to the above description of the specific embodiment, the present invention provides a motor driving current detection circuit of a massage device, a power supply main circuit 1 includes a resettable fuse P1, a motor and a sampling resistor R3 connected in series, the resettable fuse P1 has a variable resistance value in the power supply main circuit 1, and a sampling detection branch 2 detects the voltage division of the sampling resistor R3 in the power supply main circuit 1 to realize the current detection of the power supply main circuit 1, and the circuit is simple and effective, the software processing is convenient, and the whole cost is low, and the circuit can replace the expensive driving chip with current detection function; when the motor is abnormal, such as locked rotor and the like, the resistance of the resettable fuse P1 sharply increases instantaneously, so that the divided voltage can be changed, the current can be rapidly and accurately detected, the current in the power supply main loop 1 can be rapidly reduced to a safe value, and the safety of the circuit is enhanced; through reasonable setting and type selection of the resistance value of the sampling resistor R3 and the type of the resettable fuse P1, the motor can enter a current-limiting mode when the motor is locked, and the reliability of the circuit is enhanced. In addition, the motor drive current detection circuit of the massage device provided by the present application can be used for detecting the motor stall, and can also be used for detecting the motor reaching the end position for the stroke motor.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a massage device's motor drive current detection circuitry, includes and is used for supplying current with the power supply main loop of driving motor work to the motor, and is connected to power supply main loop, the sampling detection branch road that is arranged in detecting the power supply main loop current size, its characterized in that, power supply main loop is including the fuse that can reset, motor and the sampling resistance of establishing ties, but the fuse that resets is in resistance value in the power supply main loop is variable setting, the sampling detection branch road detects the sampling resistance is in the current detection of voltage division in the power supply main loop in order to realize the power supply main loop.

2. The motor-driven current detection circuit of a massage device as claimed in claim 1, wherein the power supply main circuit comprises a switch tube, a drain of the switch tube is connected to one end of the motor, a source of the switch tube is connected to one end of the sampling resistor, the other end of the sampling resistor is grounded, and a gate of the switch tube is connected to a signal output port of a control board.

3. The motor driving current detecting circuit of a massage apparatus according to claim 2, wherein said switching tube is a MOSFET configured as a speed regulating switch that can regulate the rotation speed of said motor.

4. The motor driving current detecting circuit of a massage device as claimed in claim 3, wherein the main power supply loop further comprises a pull-down resistor, one end of the pull-down resistor is connected to the gate of the switch tube, and the other end of the pull-down resistor is grounded.

5. The motor driving current detecting circuit of a massage device as claimed in claim 2, wherein the main power supply circuit further comprises a diode, an anode of the diode is connected to the drain of the switching tube and one end of the motor, and a cathode of the diode is connected to the other end of the motor.

6. The circuit for detecting motor driving current of a massage device as claimed in claim 5, wherein one end of said resettable fuse is connected to a power supply VCC, and the other end is connected to the cathode of said diode and the other end of said motor.

7. The motor drive current detection circuit of a massage device according to claim 6, wherein the resettable fuse is a PTC resistor.

8. The motor driving current detection circuit of the massage device as claimed in any one of claims 2 to 7, wherein the sampling detection branch comprises a current limiting resistor, one end of the current limiting resistor is connected between the sampling resistor and the source of the switch tube, and the other end of the current limiting resistor is connected to an AD sampling port of a control board.

9. The motor driving current detecting circuit for a massage apparatus according to claim 8, wherein said sampling detecting branch further comprises a bypass capacitor circuit, and both ends of said bypass capacitor circuit are connected to both ends of said current limiting resistor.

10. The motor driving current detecting circuit of a massage apparatus according to claim 9, wherein the bypass capacitor circuit includes a first capacitor and a second capacitor, the first capacitor being connected between one end of the current limiting resistor and ground, the second capacitor being connected between the other end of the current limiting resistor and ground.