Switch protection circuit and closestool

Abstract

The utility model provides a switch protection circuit and a closestool, the switch protection circuit comprises an AC power supply, a first switch, a second switch, a function load and a third switch which are connected in sequence to form a working loop, the switch protection circuit also comprises a filtering unit connected in parallel at two ends of the first switch, and the first switch, the second switch and the third switch are controlled by a control chip to be turned off or turned on. The energy consumption unit is connected between the input end of the second switch and the output end of the third switch in parallel, when the working loop is normally conducted, the energy consumption unit and the functional load consume energy at the same time, and consumption of charges in the filter can be accelerated; after the working loop is disconnected, the energy consumption resistor converts residual charges in the consumption filtering unit into heat energy to be consumed, and therefore the functions of maintaining the circuit and protecting the relay and the optical coupler are achieved.

Description

Technical Field

[0001] The utility model relates to the field of bathrooms, in particular to a switch protection circuit and a toilet. Background Art

[0002] With the rapid development of smart home technology, smart toilets, as a key component of modern home bathroom fixtures, are becoming increasingly versatile and capable. Air heating, a standard feature of smart toilets, provides users with a comfortable restroom experience. However, the design of the air heating relay circuit for smart toilets presents a potential safety hazard.

[0003] In existing smart toilet air heating circuits, a filter unit, including a filter capacitor, is typically installed before the switch assembly to stabilize power output and filter out high-frequency noise. During normal operation, this capacitor follows the changes in the alternating current (AC), alternating between the voltage and polarity across it.

[0004] However, if the circuit loses power for some reason (such as a user manually turning off the power or a circuit malfunction), if the switch that controls whether the heating load is connected to the circuit is disconnected first and the functional power supply has not yet consumed the charge in the capacitor in time, a voltage of unknown value and polarity will exist across the capacitor. This unknown voltage state will cause a large voltage difference when power is turned on again. If the polarity of the power-on voltage is exactly opposite to the voltage polarity in the capacitor, a current surge will occur, which may damage the switch or other related components, or even cause serious safety accidents such as fire.

[0005] To address this issue, existing technical solutions typically add delay circuits or protection circuits to reduce the voltage surge when the switch component is disconnected. However, these solutions often suffer from slow response speeds and limited protection effectiveness, and fail to fundamentally address the safety risks posed by residual capacitor charge. Utility Model Content

[0006] To address the aforementioned issues, the present invention provides a switch protection circuit and toilet. By connecting a resistor in parallel before a relay, this circuit accelerates the consumption of residual charge in the capacitor when the relay is normally disconnected, and also consumes residual charge in the capacitor when the relay disconnects before the optocoupler. This effectively manages and controls residual charge in the capacitor, improving the safety and reliability of the circuit.

[0007] The utility model is achieved through the following technical solutions:

[0008] A switch protection circuit includes an AC power supply, a first switch, a second switch, a functional load, and a third switch connected in sequence to form a working loop; a filter unit connected in parallel across the first switch; a control chip connected to the first switch, the second switch, and the third switch, respectively, the control chip being used to control the on / off of each switch; and an energy consumption unit connected in parallel between the input of the second switch and the output of the third switch.

[0009] Furthermore, the energy consumption unit includes one or more energy consumption resistors.

[0010] Furthermore, the first switch includes a photoelectric coupler, an input end of the photoelectric coupler is connected to the control chip, and an output end of the photoelectric coupler is connected to the working circuit.

[0011] Furthermore, the second switch and the third switch both include relays, the coil terminals of the relays are connected to the control chip, and the electric contact terminals and the static contact terminals of the relays are respectively connected to the working circuit.

[0012] Furthermore, the coil connection terminal of the second switch is connected in parallel with the coil connection terminal of the third switch.

[0013] Furthermore, the filtering unit includes a first resistor and a first capacitor connected in series, the other end of the first resistor is connected to the common end of the AC power supply and the first switch, and the other end of the first capacitor is connected to the common end of the first switch and the second switch.

[0014] A toilet comprises the above-mentioned relay protection circuit, wherein the functional load is a heating wire.

[0015] Furthermore, the toilet is a wall-mounted toilet or a toilet.

[0016] Compared with the prior art, the technical solution of the present utility model and its beneficial effects are as follows:

[0017] (1) In the relay protection circuit of the present invention, an energy-consuming unit is connected in parallel between the input end of the second switch and the output end of the third switch. When the working circuit is normally conducted, the energy-consuming unit and the functional load consume energy at the same time, which can accelerate the consumption of the internal charge of the filter. After the working circuit is disconnected, the energy-consuming resistor converts the residual charge in the filter unit into heat energy and consumes it, thereby playing a role in maintaining the circuit and protecting the relay.

[0018] (2) The first switch of the present invention includes a photocoupler, the input end of the photocoupler is connected to the control chip, and the output end of the photocoupler is connected to the working circuit. The second switch and the third switch each include a relay, the coil terminal of the relay is connected to the control chip, and the electric contact terminal and the static contact terminal of the relay are respectively connected to the working circuit. Thus, the control chip can control the turn-off sequence of the first switch, the second switch, and the third switch.

[0019] (3) In the power-off protection method of the present invention, when a power outage occurs, the control chip controls the second switch and the third switch to be disconnected before the first switch, or the second switch and the third switch are disconnected at the same time as the first switch, thereby effectively protecting the relay and the optocoupler, and allowing the energy-consuming unit to consume the charge on the filter unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a principle block diagram of a switch protection circuit provided in Example 1 of the present utility model;

[0021] Figure 2 This is a circuit schematic diagram of a switch protection circuit provided in Example 1 of the present utility model.

[0022] Illustration:

[0023] AC power supply 10; first switch 20; filter unit 30; second switch 40; functional load 50; third switch 60; energy consumption unit 70. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, rather than all the embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] participate Figure 1 and Figure 2A switch protection circuit includes an AC power source 10, a first switch 20, a second switch 40, a functional load 50, and a third switch 60, which are sequentially connected to form a working loop. The circuit also includes a filter unit 30 connected in parallel across the first switch, and an energy dissipation unit 70 connected in parallel between the input of the second switch 40 and the output of the third switch 60. It will be appreciated that the first switch 20, the second switch 40, and the third switch 60 are connected to an additional control chip and are controlled by the control chip to turn on or off.

[0027] During normal operation, the energy consumption unit 70 and the functional load 50 consume energy simultaneously, accelerating the depletion of charge within the filter. After the control chip controls the first switch 20, the second switch 40, and the third switch 60 to turn off, the energy consumption unit 70 consumes the residual charge in the filter unit 30, thereby preventing damage that may be caused by rapid power-on after a power outage. Specifically, the energy consumption unit includes one or more energy-consuming resistors. After the working circuit is disconnected, the energy-consuming resistors convert the residual charge in the filter unit 30 into heat energy, thereby maintaining the circuit and protecting the various switches.

[0028] In this embodiment, the first switch 20 includes a photocoupler PC1, the input end (light source) of the photocoupler PC1 is connected to the control chip, and the output end (light receiver) of the photocoupler PC1 is connected to the working circuit. The control chip controls the opening and closing of the first switch 20, thereby controlling the connection or disconnection of the AC power supply.

[0029] The second switch 40 and the third switch 60 both include relays RL1 and RL2. The coil terminals of relays RL1 and RL2 are connected to a control chip, while the motorized contact terminals and static contact terminals of relays RL1 and RL2 are connected to a working circuit. The control chip controls the opening and closing of the second and third switches 40 and 60, thereby controlling whether the functional load is connected to the circuit. In this embodiment, the coil terminals of the second switch are connected in parallel with the coil terminals of the third switch, meaning that the control chip controls the simultaneous opening and closing of relays RL1 and RL2.

[0030] The filter unit 30 includes a first resistor R1 and a first capacitor C1 connected in series. The other end of the first resistor R1 is connected to the common end of the AC power supply 100 and the first switch 20, and the other end of the first capacitor C1 is connected to the common end of the first switch 20 and the second switch 40. The filter unit 30 is used to filter the AC power supply.

[0031] The utility model has a simple structure, and by connecting an energy-consuming resistor in parallel between the input end of the second switch and the output end of the third switch, damage to the circuit caused by powering on after powering off is effectively avoided.

[0032] Example 2

[0033] A power-off protection method, applied to the relay protection circuit of Example 1, comprises: in an operating state, the first, second, and third switches are all turned on, forming a working circuit; in the event of a power outage, the control chip controls the second and third switches to turn off before the first switch, or to turn off the second and third switches simultaneously with the first switch, thereby effectively protecting the relay and allowing the energy consumption unit to consume the charge stored in the filter unit. In this embodiment, the second and third switches are connected in parallel, so that the second and third switches of the control chip are turned off or on synchronously.

[0034] Example 3

[0035] A toilet uses the relay protection method of embodiment 2, its functional load is a heating wire, and the toilet is a wall-mounted toilet or a toilet.

[0036] The foregoing description shows and describes preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A switch protection circuit, comprising an AC power supply, a first switch, a second switch, a functional load, and a third switch connected in sequence to form a working loop, further comprising a filter unit connected in parallel across the first switch; and further comprising a control chip connected to the first switch, the second switch, and the third switch, respectively, the control chip being configured to control the on / off switching of each switch, characterized in that: It also includes an energy consumption unit connected in parallel between the input end of the second switch and the output end of the third switch.

2. A switch protection circuit according to claim 1, characterized in that: The energy consumption unit includes one or more energy consumption resistors.

3. A switch protection circuit according to claim 1, characterized in that: The first switch includes a photoelectric coupler, an input end of the photoelectric coupler is connected to a control chip, and an output end of the photoelectric coupler is connected to a working circuit.

4. A switch protection circuit according to claim 1, characterized in that: The second switch and / or the third switch comprises a relay, the coil connection terminal of the relay is connected to the control chip, and the electric contact connection terminal and the static contact connection terminal of the relay are respectively connected to the working circuit.

5. A switch protection circuit according to claim 4, characterized in that: The coil connection terminal of the second switch is connected in parallel with the coil connection terminal of the third switch.

6. The switch protection circuit according to claim 1, characterized in that: The filtering unit includes a first resistor and a first capacitor connected in series, the other end of the first resistor is connected to the common end of the AC power supply and the first switch, and the other end of the first capacitor is connected to the common end of the first switch and the second switch.

7. A toilet, characterized in that: The switch protection circuit comprises the switch protection circuit according to any one of claims 1 to 6, wherein the functional load is a heating wire.

8. A toilet according to claim 7, characterized in that: The toilet is a wall-mounted toilet or a toilet.

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