Temperature sensor multiplexing circuit for a DC motor

Abstract

The application discloses a temperature sensor and direct current motor multiplexing circuit, which comprises a main control chip, a voltage conversion unit, a zero-crossing unit and a multiplexing unit; the main control chip is electrically connected with the voltage conversion unit, the zero-crossing unit and the multiplexing unit; the multiplexing unit comprises a connecting terminal, a direct current motor branch and a temperature detection branch; the connecting terminal is electrically connected with an external temperature sensor and a direct current motor; the direct current motor branch is electrically connected with the connecting terminal; and the temperature detection branch is electrically connected with the connecting terminal; when the current of the circuit flows in a forward direction, the current of the circuit flows in the direct current motor branch, the temperature detection branch is not turned on, and the direct current motor works; the application discloses a temperature sensor and direct current motor multiplexing circuit, which utilizes different current flow directions to separately turn on the direct current motor or the temperature sensor, controls the direct current motor to work alone or the temperature sensor to work alone, and achieves the purpose of controlling the direct current motor and the temperature sensor by using two lines.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit control, and particularly relates to a temperature sensor and direct current motor multiplexing circuit. BACKGROUND

[0002] The coupler base on the market is generally a five-ring structure, and the coupler base includes a live wire, a zero wire, a ground wire and the remaining two lines, wherein the live wire, the zero wire and the ground wire must be provided, and thus three lines are occupied. However, the remaining two lines are insufficient to separately control the direct current motor and detect the temperature sensor, which is not conducive to actual circuit connection and control. SUMMARY

[0003] The present application aims to provide a temperature sensor and direct current motor multiplexing circuit, which separately turns on the direct current motor or the temperature sensor under different current flow directions, controls the direct current motor or the temperature sensor to work alone, and achieves the purpose of controlling the direct current motor and the temperature sensor by using two lines.

[0004] To achieve the purpose, the present application adopts the following technical scheme: a temperature sensor and direct current motor multiplexing circuit, comprising a main control chip, a voltage conversion unit, a zero-crossing unit and a multiplexing unit; the main control chip is electrically connected with the voltage conversion unit, the zero-crossing unit and the multiplexing unit; the multiplexing unit comprises a connection terminal, a direct current motor branch and a temperature detection branch, the connection terminal is electrically connected with an external temperature sensor and a direct current motor, the direct current motor branch is electrically connected with the connection terminal, and the temperature detection branch is electrically connected with the connection terminal; when the current of the circuit flows forward, the current of the circuit flows in the direct current motor branch, the temperature detection branch is not turned on, the direct current motor works, and the temperature sensor does not work; when the current of the circuit flows reversely, the current of the circuit flows in the temperature detection branch, the direct current motor branch is not turned on, the direct current motor does not work, and the temperature sensor works.

[0005] Preferably, the direct current motor branch includes a MOS tube Q1, a capacitor C9, a triode Q3, a resistor R18, a resistor R20, a resistor R24 and a resistor R25; the source of the MOS tube Q1 is electrically connected with the output end of the voltage conversion unit, the drain of the MOS tube Q1 is electrically connected with one end of the connecting terminal and one end of the capacitor C9, the other end of the connecting terminal is grounded with the other end of the capacitor C9, the gate of the MOS tube Q1 is electrically connected with one end of the resistor R20, the resistor R18 is connected in parallel between the gate of the MOS tube Q1 and the source of the MOS tube Q1, the other end of the resistor R20 is electrically connected with the collector of the triode Q3, the emitter of the triode Q3 is grounded, the base of the triode is electrically connected with one end of the resistor R25 and one end of the resistor R24, the other end of the resistor R25 is grounded, and the other end of the resistor R24 is electrically connected with the master control chip.

[0006] Preferably, the other end of the connecting terminal and the ground further include a MOS tube Q6, a resistor R33, a resistor R34, a resistor R36 and a resistor R38; the drain of the MOS tube Q6 is electrically connected with the other end of the connecting terminal, the source of the MOS tube Q6 is electrically connected with one end of the resistor R36, one end of the resistor R38 and the master control chip, the other end of the resistor R36 and the other end of the resistor R38 are grounded, the gate of the MOS tube Q6 is electrically connected with one end of the resistor R34 and one end of the resistor R33, the other end of the resistor R34 is grounded, and the other end of the resistor R33 is electrically connected with the master control chip.

[0007] Preferably, the MOS tube Q1 is a P-type MOS tube, and the MOS tube Q6 is an N-type MOS tube.

[0008] Preferably, the temperature detection branch comprises a transistor Q2, a resistor R19, a resistor R21, a resistor R22, a resistor R26, a resistor R27, a resistor R28, a resistor R32, a transistor Q4, a transistor Q5 and a resistor R15; one end of the collector of the transistor Q2 is electrically connected with the connection terminal, the emitter of the transistor Q2 is grounded, the resistor R22 is connected in parallel between the emitter and the base of the transistor Q2, the base of the transistor Q2 is electrically connected with one end of the resistor R19, the other end of the resistor R19 is electrically connected with one end of the resistor R21 and the main control chip, the other end of the resistor R21 is electrically connected with the base of the transistor Q4, the resistor R28 is connected in parallel between the base and the emitter of the transistor Q4, the collector of the transistor Q4 is electrically connected with one end of the resistor R26, the other end of the resistor R26 is electrically connected with one end of the resistor R27 and the base of the transistor Q5, the other end of the resistor R27 is electrically connected with the emitter of the transistor Q5 and the voltage conversion unit, the collector of the transistor Q5 is electrically connected with one end of the resistor R32, the other end of the resistor R32 is electrically connected with the drain of the MOS transistor Q6 and one end of the resistor R15, the other end of the resistor R15 is electrically connected with the main control chip.

[0009] Preferably, the zero-crossing unit comprises a resistor R39, a resistor R40, a photoelectric coupling chip, a resistor R35, a resistor R37 and a diode D6; one end of the resistor R39 is electrically connected with the power supply, the other end of the resistor R39 is electrically connected with one end of the resistor R40, the other end of the resistor R40 is electrically connected with the first pin of the photoelectric coupling chip, the negative electrode of the diode D6 is electrically connected with the power supply, the positive electrode of the diode D6 is electrically connected with the second pin of the photoelectric coupling chip, the third pin of the photoelectric coupling chip is grounded, the fourth pin of the photoelectric coupling chip is electrically connected with one end of the resistor R35 and one end of the resistor R37, the other end of the resistor R35 is electrically connected with the output end of the voltage conversion unit, the other end of the resistor R37 is electrically connected with the main control chip.

[0010] Preferably, the voltage conversion unit comprises a rectifier filter circuit, a voltage conversion circuit and a voltage stabilizing circuit, the rectifier filter circuit is electrically connected with the power supply, the voltage conversion circuit is electrically connected with the rectifier filter circuit, the voltage conversion circuit is electrically connected with the voltage stabilizing circuit, and the voltage stabilizing circuit is electrically connected with the main control chip, the direct current motor branch and the zero-crossing unit.

[0011] The beneficial effects of one technical scheme of the present application are as follows: by setting the multiplexing circuit, the forward flow and reverse flow of the current are utilized, the corresponding DC motor or temperature sensor is turned on under the different flow directions of the current, when the current flows in one direction, the DC motor works and the temperature sensor does not work, when the current flows in the opposite direction, the DC motor does not work and the temperature sensor works, in the remaining two lines, the multiplexing circuit is utilized to achieve the purpose of controlling the DC motor and the temperature sensor respectively, the structure of the coupler base does not need to be redesigned and produced, and the five-ring structure of the coupler base on the market can be adapted. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 is a circuit connection schematic diagram of one embodiment of the present application;

[0013] Fig. 2 is a circuit structure schematic diagram of a multiplexing unit of one embodiment of the present application;

[0014] Fig. 3 is a circuit structure schematic diagram of a zero-crossing unit of one embodiment of the present application;

[0015] Fig. 4 is a circuit structure schematic diagram of a voltage conversion unit of one embodiment of the present application.

[0016] Among them: main control chip 1, voltage conversion unit 2, zero-crossing unit 3, multiplexing unit 4, connection terminal 41, DC motor branch 42, temperature detection branch 43. DETAILED DESCRIPTION

[0017] The technical scheme of the present application will be further described below in combination with the drawings and through specific embodiments.

[0018] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0019] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0020] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", and "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] Referring to Figs. 1 to 4 As shown in the figure, a temperature sensor and DC motor multiplexing circuit, including master chip 1, voltage conversion unit 2, zero crossing unit 3 and multiplexing unit 4;The master chip 1 and the voltage conversion unit 2, the zero crossing unit 3 and the multiplexing unit 4 are electrically connected;

[0022] The multiplexing unit 4 includes connection terminal 41, DC motor branch 42 and temperature detection branch 43, the connection terminal 41 and the external temperature sensor and DC motor electrically connected, the DC motor branch 42 and the connection terminal 41 electrically connected, the temperature detection branch 43 and the connection terminal 41 electrically connected;

[0023] When the current of the circuit flows in the positive direction, the current of the circuit flows in the DC motor branch 42, the temperature detection branch 43 is not conductive, the DC motor works, and the temperature sensor does not work;

[0024] When the current of the circuit flows in the reverse direction, the current of the circuit flows in the temperature detection branch 43, the DC motor branch 42 is not conductive, the DC motor does not work, and the temperature sensor works.

[0025] The coupler base on the market is generally a five-ring structure, and the coupler base includes live wire, zero line, ground wire and the remaining two lines, wherein the live wire, zero line and ground wire must be set, which occupies three lines, however, the remaining two lines are insufficient to control the DC motor and detect the temperature sensor, which is not conducive to the actual circuit connection and control.

[0026] The present application sets up multiplexing circuit, utilizes the positive flow and reverse flow of current, turns on the corresponding DC motor or temperature sensor under the different flow direction of current, when the current flows in one direction, the DC motor works, and the temperature sensor does not work, when the current flows in the opposite direction, the DC motor does not work, and the temperature sensor works, in the remaining two lines, the multiplexing circuit is used to control the DC motor and temperature sensor respectively, without redesigning and producing the structure of the coupler base, which can adapt to the five-ring structure of the coupler base on the market.

[0027] Specifically, the direct current motor branch 42 comprises a MOS tube Q1, a capacitor C9, a triode Q3, a resistor R18, a resistor R20, a resistor R24 and a resistor R25; the source of the MOS tube Q1 is electrically connected with the output end of the voltage conversion unit 2, the drain of the MOS tube Q1 is electrically connected with one end of the connecting terminal 41 and one end of the capacitor C9, the other end of the connecting terminal 41 is grounded with the other end of the capacitor C9, the gate of the MOS tube Q1 is electrically connected with one end of the resistor R20, the resistor R18 is connected in parallel between the gate of the MOS tube Q1 and the source of the MOS tube Q1, the other end of the resistor R20 is electrically connected with the collector of the triode Q3, the emitter of the triode Q3 is grounded, the base of the triode is electrically connected with one end of the resistor R25 and one end of the resistor R24, the other end of the resistor R25 is grounded, and the other end of the resistor R24 is electrically connected with the main control chip 1.

[0028] When the direct current motor works, the main control chip 1 sends a signal to the triode Q3, so that the triode Q3 is turned on, at this time, the MOS tube Q1 is turned on, the voltage conversion unit 2 provides a 12V voltage at the gate of the MOS tube Q1, and the current flows from the MOS tube Q1 to the connecting terminal 41, so that the direct current motor is powered on and works, and the current flows into the ground along the other end of the connecting terminal 41.

[0029] Preferably, the other end of the connecting terminal 41 and the ground further comprise a MOS tube Q6, a resistor R33, a resistor R34, a resistor R36 and a resistor R38; the drain of the MOS tube Q6 is electrically connected with the other end of the connecting terminal 41, the source of the MOS tube Q6 is electrically connected with one end of the resistor R36, one end of the resistor R38 and the main control chip 1, the other end of the resistor R36 and the other end of the resistor R38 are grounded, the gate of the MOS tube Q6 is electrically connected with one end of the resistor R34 and one end of the resistor R33, the other end of the resistor R34 is grounded, and the other end of the resistor R33 is electrically connected with the main control chip 1. The MOS tube Q1 is a P-type MOS tube, and the MOS tube Q6 is an N-type MOS tube.

[0030] The resistor R24 and the resistor R33 are connected with the same pin in the main control chip 1, when the main control chip 1 sends a high level, the triode Q3 is turned on, because the MOS tube Q6 is an N-type MOS tube, the gate of the MOS tube Q6 is at a high level, the MOS tube Q6 is turned on, after the current flows out from the other end of the connecting terminal 41, through the MOS tube Q6, into the parallel circuit of the resistor R36 and the resistor R38, and into the ground, a feedback signal is output from one end of the parallel circuit of the resistor R36 and the resistor R38 to the main control chip 1, so as to judge whether the current is normally circulated through the feedback signal.

[0031] Specifically, the temperature detection branch 43 comprises a transistor Q2, a resistor R19, a resistor R21, a resistor R22, a resistor R26, a resistor R27, a resistor R28, a resistor R32, a transistor Q4, a transistor Q5 and a resistor R15; one end of the collector of the transistor Q2 is electrically connected with one end of the connection terminal 41, the emitter of the transistor Q2 is grounded, the resistor R22 is connected in parallel between the emitter and the base of the transistor Q2, the base of the transistor Q2 is electrically connected with one end of the resistor R19, the other end of the resistor R19 is electrically connected with one end of the resistor R21 and the main control chip 1, the other end of the resistor R21 is electrically connected with the base of the transistor Q4, the resistor R28 is connected in parallel between the base and the emitter of the transistor Q4, the collector of the transistor Q4 is electrically connected with one end of the resistor R26, the other end of the resistor R26 is electrically connected with one end of the resistor R27 and the base of the transistor Q5, the other end of the resistor R27 is electrically connected with the emitter of the transistor Q5 and the voltage conversion unit 2, the collector of the transistor Q5 is electrically connected with one end of the resistor R32, the other end of the resistor R32 is electrically connected with the drain of the MOS transistor Q6 and one end of the resistor R15, the other end of the resistor R15 is electrically connected with the main control chip 1.

[0032] When the temperature sensor works, the flowing direction of the current is opposite to that when the direct current motor works, at this time, the main control chip 1 sends a signal to the transistor Q2 and the transistor Q4, the base of the transistor Q2 and the base of the transistor Q4 receive the high level and are turned on, the current flows from one end of the resistor R15 to the connection terminal 41, after passing through the connection terminal 41, it flows into the ground through the transistor Q2, at the same time, the transistor Q5 is turned on, the current returns to the resistor R15 after passing through the resistor R32, the other end of the resistor R15 feeds back the signal to the main control chip 1, the main control chip 1 converts the temperature value by detecting the voltage of the other end of the resistor R15.

[0033] In the embodiment, the zero-crossing unit 3 comprises a resistor R39, a resistor R40, an optoelectronic coupling chip, a resistor R35, a resistor R37 and a diode D6; one end of the resistor R39 is electrically connected with the power supply, the other end of the resistor R39 is electrically connected with one end of the resistor R40, the other end of the resistor R40 is electrically connected with the first pin of the optoelectronic coupling chip, the negative electrode of the diode D6 is electrically connected with the power supply, the positive electrode of the diode D6 is electrically connected with the second pin of the optoelectronic coupling chip, the third pin of the optoelectronic coupling chip is grounded, the fourth pin of the optoelectronic coupling chip is electrically connected with one end of the resistor R35 and one end of the resistor R37, the other end of the resistor R35 is electrically connected with the output end of the voltage conversion unit 2, the other end of the resistor R37 is electrically connected with the main control chip 1.

[0034] The zero-crossing unit 3 can control the power output of the circuit in operation, and can also be used to calibrate the circuit to keep the circuit in synchronization.

[0035] Specifically, the voltage conversion unit 2 comprises a rectification filtering circuit, a voltage conversion circuit and a voltage stabilizing circuit, the rectification filtering circuit is electrically connected with the power supply, the voltage conversion circuit is electrically connected with the rectification filtering circuit, the voltage conversion circuit is electrically connected with the voltage stabilizing circuit, and the voltage stabilizing circuit is electrically connected with the master control chip 1, the DC motor branch 42 and the zero-crossing unit 3.

[0036] In the description of the present specification, the description referring to the terms "embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] The technical principles of the present application are described above in connection with specific embodiments. These descriptions are only for the purpose of explaining the principles of the present application, and cannot be interpreted in any way as a limitation on the scope of protection of the present application. Based on the explanations herein, those skilled in the art can conceive other specific embodiments of the present application without creative labor, and these embodiments will fall within the scope of protection of the present application.

Claims

1. A temperature sensor and DC motor multiplexing circuit, characterized in that, The circuit comprises a main control chip, a voltage conversion unit, a zero-crossing unit and a multiplexing unit; the main control chip is electrically connected with the voltage conversion unit, the zero-crossing unit and the multiplexing unit; The multiplexing unit comprises a connection terminal, a direct current motor branch and a temperature detection branch; the connection terminal is electrically connected with an external temperature sensor and a direct current motor; the direct current motor branch is electrically connected with the connection terminal; and the temperature detection branch is electrically connected with the connection terminal; The direct current motor branch comprises a MOS tube Q1, a capacitor C9, a triode Q3, a resistor R18, a resistor R20, a resistor R24 and a resistor R25; the source of the MOS tube Q1 is electrically connected with the output terminal of the voltage conversion unit; the drain of the MOS tube Q1 is electrically connected with one end of the connection terminal and one end of the capacitor C9; the other end of the connection terminal is grounded with the other end of the capacitor C9; the gate of the MOS tube Q1 is electrically connected with one end of the resistor R20; the resistor R18 is connected in parallel between the gate of the MOS tube Q1 and the source of the MOS tube Q1; the other end of the resistor R20 is electrically connected with the collector of the triode Q3; the emitter of the triode Q3 is grounded; the base of the triode is electrically connected with one end of the resistor R25 and one end of the resistor R24; the other end of the resistor R25 is grounded; and the other end of the resistor R24 is electrically connected with the main control chip; The other end of the connection terminal and the ground further comprise a MOS tube Q6, a resistor R33, a resistor R34, a resistor R36 and a resistor R38; the drain of the MOS tube Q6 is electrically connected with the other end of the connection terminal; the source of the MOS tube Q6 is electrically connected with one end of the resistor R36, one end of the resistor R38 and the main control chip; the other end of the resistor R36 and the other end of the resistor R38 are grounded; the gate of the MOS tube Q6 is electrically connected with one end of the resistor R34 and one end of the resistor R33; the other end of the resistor R34 is grounded; and the other end of the resistor R33 is electrically connected with the main control chip; The MOS tube Q1 is a P-type MOS tube, and the MOS tube Q6 is an N-type MOS tube; When the current of the circuit flows in a forward direction, the current of the circuit flows in the direct current motor branch, the temperature detection branch is not conductive, the direct current motor works, and the temperature sensor does not work; when the direct current motor works, the main control chip sends a signal to the triode Q3, so that the triode Q3 is conductive; at this time, the MOS tube Q1 is conductive; the voltage conversion unit provides a 12V voltage at the gate of the MOS tube Q1; the current flows from the MOS tube Q1 to the connection terminal; the direct current motor is powered and works; and the current flows into the ground along the other end of the connection terminal. The temperature detection branch includes a transistor Q2, a resistor R19, a resistor R21, a resistor R22, a resistor R26, a resistor R27, a resistor R28, a resistor R32, a transistor Q4, a transistor Q5 and a resistor R15; one end of the collector of the transistor Q2 is electrically connected with the connection terminal, the emitter of the transistor Q2 is grounded, the resistor R22 is connected in parallel between the emitter and the base of the transistor Q2, the base of the transistor Q2 is electrically connected with one end of the resistor R19, the other end of the resistor R19 is electrically connected with one end of the resistor R21 and the main control chip, the other end of the resistor R21 is electrically connected with the base of the transistor Q4, the resistor R28 is connected in parallel between the base and the emitter of the transistor Q4, the collector of the transistor Q4 is electrically connected with one end of the resistor R26, the other end of the resistor R26 is electrically connected with one end of the resistor R27 and the base of the transistor Q5, the other end of the resistor R27 is electrically connected with the emitter of the transistor Q5 and the voltage conversion unit, the collector of the transistor Q5 is electrically connected with one end of the resistor R32, the other end of the resistor R32 is electrically connected with the drain of the MOS transistor Q6 and one end of the resistor R15, the other end of the resistor R15 is electrically connected with the main control chip; When the current of the circuit flows reversely, the current of the circuit flows in the temperature detection branch, the direct current motor branch is not conductive, the direct current motor does not work, and the temperature sensor works; when the temperature sensor works, the main control chip sends a signal to the transistor Q2, the base of the transistor Q2 receives a high level and is conductive, the current flows from one end of the resistor R15 to the connection terminal, and then flows into the ground through the transistor Q2 after passing through the connection terminal.

2. The temperature sensor multiplexing circuit for DC motor according to claim 1, wherein The zero-crossing unit includes a resistor R39, a resistor R40, a photoelectric coupling chip, a resistor R35, a resistor R37 and a diode D6; one end of the resistor R39 is electrically connected with the power supply, the other end of the resistor R39 is electrically connected with one end of the resistor R40, the other end of the resistor R40 is electrically connected with the first pin of the photoelectric coupling chip, the negative electrode of the diode D6 is electrically connected with the power supply, the positive electrode of the diode D6 is electrically connected with the second pin of the photoelectric coupling chip, the third pin of the photoelectric coupling chip is grounded, the fourth pin of the photoelectric coupling chip is electrically connected with one end of the resistor R35 and one end of the resistor R37, the other end of the resistor R35 is electrically connected with the output end of the voltage conversion unit, and the other end of the resistor R37 is electrically connected with the main control chip.

3. The temperature sensor multiplexing circuit for DC motor according to claim 1, wherein The voltage conversion unit includes a rectifier filter circuit, a voltage conversion circuit and a voltage stabilizing circuit, the rectifier filter circuit is electrically connected with the power supply, the voltage conversion circuit is electrically connected with the rectifier filter circuit, the voltage conversion circuit is electrically connected with the voltage stabilizing circuit, and the voltage stabilizing circuit is electrically connected with the main control chip, the direct current motor branch and the zero-crossing unit.

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