Convenient control circuit of three-speed fan and control method of convenient control circuit

Abstract

A high-speed control circuit, a medium-speed control circuit, a low-speed control circuit and an interlocking control circuit are connected to a control power supply in parallel, a high-speed inching button, a medium-speed inching button and a low-speed inching button are used for control, a normally-open switch is adopted for the button of each speed, and two normally-closed switches are synchronous; in addition, a power-on time-delay relay and a time-delay contact are connected in series in a fan winding, the problem that the three windings are electrified at the same time is solved, and when the switching wind speed is reduced, the power-on time-delay of the winding at a relatively low speed needs to be delayed, so that the power-on time-delay of the winding at a relatively low speed is reduced, and the power-on time-delay of the winding at a relatively low speed is reduced. And after the rotating speed of the fan is reduced, relatively low-speed starting is adapted.

Description

Technical Field

[0001] The invention relates to a fan technology, in particular to a convenient control circuit and a control method of a three-speed fan. Background Art

[0002] The existing three-speed fan control generally uses a first-level button control and is switched through an intermediate relay. The circuit is complex. In addition, when switching the three speeds, three windings are energized at the same time, which affects the life of the motor. Summary of the invention

[0003] The present invention provides a convenient control circuit and a control method for a three-speed fan capable of conveniently controlling the start-up and switching of high, medium and low speeds.

[0004] The technical solution adopted by the present invention is: a convenient control circuit for a three-speed fan, including a control power supply, characterized in that: a high-speed control circuit, a medium-speed control circuit, a low-speed control circuit and an interlocking control circuit are connected in parallel to the control power supply; a high-speed normally open switch, a medium-speed first normally closed switch, a low-speed first normally closed switch, a stop first normally closed switch and a high-speed relay are connected in series in sequence to the high-speed control circuit; a high-speed indicator light is connected in parallel to the high-speed relay, and a high-speed relay normally open switch is connected in parallel to the high-speed normally open switch; a high-speed first normally closed switch, a medium-speed normally open switch, a low-speed second normally closed switch, a stop second normally closed switch and a medium-speed relay are connected in series in sequence to the medium-speed control circuit; a medium-speed indicator light is connected in parallel to the medium-speed relay, and a medium-speed relay normally open switch is connected in parallel to the medium-speed normally open switch; a high-speed second normally closed switch and a medium-speed second normally closed switch are connected in series in sequence to the low-speed control circuit. , low-speed normally open switch, stop third normally closed switch and low-speed relay, a low-speed indicator light is connected in parallel on the low-speed relay, and the low-speed relay normally open switch is connected in parallel to the low-speed normally open switch; the high-speed normally open switch, the first and second high-speed normally closed switches are high-speed three-level inching type buttons, the medium-speed normally open switch, the first and second medium-speed normally closed switches are medium-speed three-level inching type buttons, the low-speed normally open switch, the first and second low-speed normally open switches are low-speed three-level inching type buttons; the first, second and third normally closed switches of stop are three-level inching type buttons; the interlocking control circuit is divided into three routes, the control power supply is connected to the high-speed winding of the fan through the high-speed relay normally open power-on delay switch and then returns to the control power supply, the control power supply is connected to the medium-speed winding of the fan through the medium-speed relay normally open power-on delay switch and then returns to the control power supply, and the control power supply is connected to the low-speed winding of the fan through the low-speed relay normally open power-on delay switch and then returns to the control power supply.

[0005] The interlocking control circuit is divided into three paths and connected to the high, medium and low speed points of the fan winding respectively through the normally open power-delay switches of the high, medium and low speed relays.

[0006] A convenient control method for a three-speed fan, characterized in that: a. When starting at high speed: press the high-speed three-level inching button, the interlocked high-speed normally open switch is closed, the first and second high-speed normally closed switches are opened, the high-speed control circuit is connected, the medium-speed and low-speed control circuits remain disconnected, the high-speed relay is energized, the high-speed relay normally open switch is closed to lock the high-speed normally open switch, the high-speed control circuit remains connected, after the high-speed relay is energized for a delay time, the high-speed relay normally open energization delay switch is closed, the fan high-speed winding is connected, and the fan starts at high speed; at this time, the high-speed indicator light is on; b. When starting at medium speed: press the medium speed three-level inching button, the chained medium speed normally open switch is closed, the first and second medium speed normally closed switches are opened, the medium speed control circuit is connected, the high speed and low speed control circuits remain disconnected, the medium speed relay is energized, the medium speed relay normally open switch is closed to lock the medium speed normally open switch, the medium speed control circuit remains connected, after the medium speed relay is energized for a delay time, the medium speed relay normally open energization delay switch is closed, the fan medium speed winding is connected, and the fan starts at medium speed; at this time, the medium speed indicator light is on; c. When starting at low speed: press the low-speed three-level inching button, the interlocked low-speed normally open switch is closed, the first and second low-speed normally closed switches are opened, the low-speed control circuit is connected, the high-speed and medium-speed control circuits remain disconnected, the low-speed relay is energized, the low-speed relay normally open switch is closed to lock the low-speed normally open switch, and the low-speed control circuit remains connected. After the low-speed relay is energized for a delay time, the low-speed relay normally open energization delay switch is closed, the fan low-speed winding is connected, and the fan starts at low speed; at this time, the low-speed indicator light is on; d. Wind speed switching: When there is a need to switch between high, medium and low speeds, since the three-level inching buttons of high, medium and low are reset after the respective wind speeds are started, when switching to press the three-level inching buttons corresponding to other wind speeds, just press them directly and control the normally open switch to lock after the corresponding relay of the required wind speed circuit is energized; the normally closed switch of the original wind speed circuit is disconnected to control the corresponding relay to lose power; and the fan winding of the required wind speed is connected only after the normally open energized delay switch of the corresponding relay of the required wind speed circuit has delayed for a certain period of time; e. Stop: Press the three-level stop button to disconnect the first, second and third normally closed switches, ensuring that the high-speed, medium-speed and low-speed control lines are all disconnected at once. Regardless of whether the fan is running at high, medium or low speed, the normally open delay switches of the high-speed, medium and low-speed relays are instantly disconnected, the fan windings are disconnected and the fan stops.

[0007] The present invention uses a three-level inching button control for high, medium and low speeds. The buttons for each speed are synchronized using a normally open switch and two normally closed switches, thereby realizing parallel high, medium and low speed relays for the high, medium and low speed lines. In addition, by using an energization delay relay, the delay contact is connected in series in the fan winding, which solves the problem of the three windings being energized at the same time. When the wind speed is switched to be reduced, the energization of the relatively low-speed winding needs to be delayed, so that the relatively low-speed start-up is adapted after the fan speed is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a circuit diagram of the present invention.

[0009] In the figure: control power supply AC, high-speed control circuit 1, medium-speed control circuit 2, low-speed control circuit 3, interlocking control circuit 4, high-speed three-level inching button SB1, high-speed normally open switch SB1-1, high-speed first normally closed switch SB1-2, high-speed second normally closed switch SB1-3, medium-speed three-level inching button SB2, medium-speed first normally closed switch SB2-1, medium-speed normally open switch SB2-2, medium-speed second normally closed switch SB2-3, low-speed three-level inching button SB3, low-speed first normally closed switch SB3-1, low-speed second normally closed switch SB3-2, low-speed normally open switch SB3-3, stop three-level inching button SB4, stop first normally closed switch Close switch SB4-1, stop the second normally closed switch SB4-2, stop the third normally closed switch SB4-3, high-speed relay K1, high-speed relay normally open switch K1-1, high-speed relay normally open power-on delay switch K1-2, medium-speed relay K2, medium-speed relay normally open switch K2-1, medium-speed relay normally open power-on delay switch K2-2, low-speed relay K3, low-speed relay normally open switch K3-1, low-speed relay normally open power-on delay switch K3-2, high-speed indicator light HL1, medium-speed indicator light HL2, low-speed indicator light HL3, fan M, fan winding L, high-speed winding node L1, medium-speed winding node L2, low-speed winding node L3. DETAILED DESCRIPTION

[0010] The following is a further description with reference to the accompanying drawings.

[0011] Figure 1 As shown: A convenient control circuit for a three-speed fan, a high-speed control circuit 1, a medium-speed control circuit 2, a low-speed control circuit 3 and a chain control circuit 4 are connected in parallel on the control power supply AC. The high-speed control circuit 2 is connected in series with the high-speed normally open switch SB1-1, the medium-speed first normally closed switch SB2-1, the low-speed first normally closed switch SB3-1, the stop first normally closed switch SB4-1 and the high-speed relay K1 in sequence, the high-speed indicator light HL1 is connected in parallel to the high-speed relay K1, and the high-speed relay normally open switch K1-1 is connected in parallel to the high-speed normally open switch SB1-1; the medium-speed control circuit 3 is connected in series with the high-speed first normally closed switch SB1-2, the medium-speed normally open switch SB2-2, the low-speed second normally closed switch SB3-2, the stop second normally closed switch S B4-2 and medium-speed relay K2, the medium-speed indicator light HL2 is connected in parallel to the medium-speed relay K2, and the medium-speed relay normally-open switch K2-1 is connected in parallel to the medium-speed normally-open switch SB2-2; the high-speed second normally-closed switch SB1-3, the medium-speed second normally-closed switch SB2-3, the low-speed normally-open switch SB3-3, the stop third normally-closed switch SB4-3 and the low-speed relay K3 are connected in series in sequence on the low-speed control circuit 4, the low-speed indicator light HL3 is connected in parallel to the low-speed relay K3, and the low-speed relay normally-open switch K3-1 is connected in parallel to the low-speed normally-open switch SB3-3.

[0012] The high-speed normally open switch SB1-1, the high-speed first normally closed switch SB1-2, and the high-speed second normally closed switch SB1-3 are the high-speed three-level momentary button SB1, the medium-speed first normally closed switch SB2-1, the medium-speed normally open switch SB2-2, and the medium-speed second normally closed switch SB2-3 are the medium-speed three-level momentary button SB2, the low-speed first normally closed switch SB3-1, the low-speed second normally closed switch SB3-2, and the low-speed normally open switch SB3-3 are the low-speed three-level momentary button SB3, and the stop first normally closed switch SB4-1, the stop second normally closed switch SB4-2, and the stop third normally closed switch SB4-3 are the stop three-level momentary button SB4.

[0013] The interlocking control line 4 is divided into three routes, the first route is connected to the high-speed winding node L1 of the fan winding L of the fan M through the high-speed relay normally open power-on delay switch K1-2, the second route is connected to the medium-speed winding node L2 of the fan winding L of the fan M through the medium-speed relay normally open power-on delay switch K2-2, and the third route is connected to the low-speed winding node L3 of the fan winding L of the fan M through the low-speed relay normally open power-on delay switch K3-2.

[0014] The control method of the convenient control circuit of the three-speed fan is as follows: a. When starting at high speed: press the high-speed three-level inching button, the interlocked high-speed normally open switch is closed, the first and second high-speed normally closed switches are opened, the high-speed control circuit is connected, the medium-speed and low-speed control circuits remain disconnected, the high-speed relay is energized, the high-speed relay normally open switch is closed to lock the high-speed normally open switch, the high-speed control circuit remains connected, after the high-speed relay is energized for a delay time, the high-speed relay normally open energization delay switch is closed, the fan high-speed winding is connected, and the fan starts at high speed; at this time, the high-speed indicator light is on; b. When starting at medium speed: press the medium speed three-level inching button, the chained medium speed normally open switch is closed, the first and second medium speed normally closed switches are opened, the medium speed control circuit is connected, the high speed and low speed control circuits remain disconnected, the medium speed relay is energized, the medium speed relay normally open switch is closed to lock the medium speed normally open switch, the medium speed control circuit remains connected, after the medium speed relay is energized for a delay time, the medium speed relay normally open energization delay switch is closed, the fan medium speed winding is connected, and the fan starts at medium speed; at this time, the medium speed indicator light is on; c. When starting at low speed: press the low-speed three-level inching button, the interlocked low-speed normally open switch is closed, the first and second low-speed normally closed switches are opened, the low-speed control circuit is connected, the high-speed and medium-speed control circuits remain disconnected, the low-speed relay is energized, the low-speed relay normally open switch is closed to lock the low-speed normally open switch, and the low-speed control circuit remains connected. After the low-speed relay is energized for a delay time, the low-speed relay normally open energization delay switch is closed, the fan low-speed winding is connected, and the fan starts at low speed; at this time, the low-speed indicator light is on; d. Wind speed switching: When there is a need to switch between high, medium and low speeds, since the three-level inching buttons of high, medium and low are reset after the respective wind speeds are started, when switching to press the three-level inching buttons corresponding to other wind speeds, just press them directly and control the normally open switch to lock after the corresponding relay of the required wind speed circuit is energized; the normally closed switch of the original wind speed circuit is disconnected to control the corresponding relay to lose power; and the fan winding of the required wind speed is connected only after the normally open energized delay switch of the corresponding relay of the required wind speed circuit has delayed for a certain period of time; e. Stop: Press the three-level stop button to disconnect the first, second and third normally closed switches, ensuring that the high-speed, medium-speed and low-speed control lines are all disconnected at once. Regardless of whether the fan is running at high, medium or low speed, the normally open delay switches of the high-speed, medium and low-speed relays are instantly disconnected, the fan windings are disconnected and the fan stops.

Claims

1. A convenient control circuit for a three-speed fan, including a control power supply, characterized in that: The control power supply is connected in parallel with a high-speed control circuit, a medium-speed control circuit, a low-speed control circuit and an interlocking control circuit; the high-speed control circuit is connected in series with a high-speed normally open switch, a medium-speed first normally closed switch, a low-speed first normally closed switch, a stop first normally closed switch and a high-speed relay in sequence; a high-speed indicator light is connected in parallel with the high-speed relay, and the high-speed relay normally open switch is connected in parallel with the high-speed normally open switch; the medium-speed control circuit is connected in series with a high-speed first normally closed switch, a medium-speed normally open switch, a low-speed second normally closed switch, a stop second normally closed switch and a medium-speed relay in sequence; a medium-speed indicator light is connected in parallel with the medium-speed relay, and the medium-speed relay normally open switch is connected in parallel with the medium-speed normally open switch; the low-speed control circuit is connected in series with a high-speed second normally closed switch, a medium-speed second normally closed switch, a low-speed normally open switch, a stop third normally closed switch and a low-speed Relay, a low-speed indicator light is connected in parallel on the low-speed relay, and the normally open switch of the low-speed relay is connected in parallel to the normally open switch of the low-speed; the high-speed normally open switch, the first and second normally closed switches of the high-speed are high-speed three-level inching type buttons, the medium-speed normally open switch, the first and second normally closed switches of the medium-speed are medium-speed three-level inching type buttons, the low-speed normally open switch, the first and second normally open switches of the low-speed are low-speed three-level inching type buttons; the first, second and third normally closed switches of the stop are three-level inching type buttons of the stop; the interlocking control circuit is divided into three routes, the control power supply is connected to the high-speed winding of the fan through the normally open power-on delay switch of the high-speed relay and then returns to the control power supply, the control power supply is connected to the medium-speed winding of the fan through the normally open power-on delay switch of the medium-speed relay and then returns to the control power supply, and the control power supply is connected to the low-speed winding of the fan through the normally open power-on delay switch of the low-speed relay and then returns to the control power supply.

2. According to claim 1, a convenient control circuit for a three-speed fan is characterized in that: The interlocking control circuit is divided into three paths and connected to the high, medium and low speed points of the fan winding respectively through the normally open power-delay switches of the high, medium and low speed relays.

3. A convenient control method for a three-speed fan, characterized in that: a. When starting at high speed: press the high-speed three-level inching button, the interlocked high-speed normally open switch is closed, the first and second high-speed normally closed switches are opened, the high-speed control circuit is connected, the medium-speed and low-speed control circuits remain disconnected, the high-speed relay is energized, the high-speed relay normally open switch is closed to lock the high-speed normally open switch, the high-speed control circuit remains connected, after the high-speed relay is energized for a delay time, the high-speed relay normally open energization delay switch is closed, the fan high-speed winding is connected, and the fan starts at high speed; at this time, the high-speed indicator light is on; b. When starting at medium speed: press the medium speed three-level inching button, the chained medium speed normally open switch is closed, the first and second medium speed normally closed switches are opened, the medium speed control circuit is connected, the high speed and low speed control circuits remain disconnected, the medium speed relay is energized, the medium speed relay normally open switch is closed to lock the medium speed normally open switch, the medium speed control circuit remains connected, after the medium speed relay is energized for a delay time, the medium speed relay normally open energization delay switch is closed, the fan medium speed winding is connected, and the fan starts at medium speed; at this time, the medium speed indicator light is on; c. When starting at low speed: press the low-speed three-level inching button, the interlocked low-speed normally open switch is closed, the first and second low-speed normally closed switches are opened, the low-speed control circuit is connected, the high-speed and medium-speed control circuits remain disconnected, the low-speed relay is energized, the low-speed relay normally open switch is closed to lock the low-speed normally open switch, and the low-speed control circuit remains connected. After the low-speed relay is energized for a delay time, the low-speed relay normally open energization delay switch is closed, the fan low-speed winding is connected, and the fan starts at low speed; at this time, the low-speed indicator light is on; d. Wind speed switching: When there is a need to switch between high, medium and low speeds, since the three-level inching buttons of high, medium and low are reset after the start of each wind speed, when switching to press the three-level inching buttons corresponding to other wind speeds, just press them directly and control the normally open switch to lock after the corresponding relay of the required wind speed circuit is energized; the normally closed switch of the original wind speed circuit is disconnected to control the corresponding relay to lose power; The fan winding of the required wind speed is connected only after the normally open energized delay switch of the corresponding relay of the required wind speed circuit has delayed for a certain period of time; e. Stop: Press the three-level stop button to disconnect the first, second and third normally closed switches, ensuring that the high-speed, medium-speed and low-speed control lines are all disconnected at once. Regardless of whether the fan is running at high, medium or low speed, the normally open delay switches of the high-speed, medium and low-speed relays are instantly disconnected, the fan windings are disconnected and the fan stops.

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