Short circuit prevention type power supply circuit and intelligent furniture

Abstract

The utility model provides a short circuit prevention type power supply circuit and intelligent furniture, the circuit comprises a power supply circuit and a discharge protection circuit, the discharge protection circuit comprises a first switch tube, a second switch tube, a universal diode, a first resistor, a second resistor and a third resistor, the first end of the first switch tube is connected with the output positive end of the power supply circuit, and the second end of the second switch tube is connected with the output negative end of the power supply circuit; the second end of the first switch tube is connected with the voltage positive end of the electric furniture, the control end of the first switch tube is connected with the first end of the first resistor and the first end of the second switch tube, the second end of the first resistor is connected with the first end of the first switch tube, and the second end of the second switch tube is grounded. The control end of the second switch tube is connected with the first end of the second resistor and the first end of the third resistor. When the positive and negative electrodes of the bare wire are short-circuited, the first switch tube and the second switch tube are cut off, and the whole circuit is in an open-circuit state, thereby preventing arc sparks, high temperature and even fire caused by short-circuiting of the positive and negative electrodes of the wire.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of intelligent furniture, in particular to a short-circuit prevention type power supply circuit and intelligent furniture. BACKGROUND

[0002] With the development of intelligent furniture, there are many types of intelligent furniture on the market, such as electric sofas, electric beds, automatic curtains, etc.

[0003] Taking an electric sofa as an example, when the sofa bottom height, leg support angle or backrest angle is adjusted, the adjusting mechanism (such as an iron clamp) will inevitably clamp or rub against the electric wire under the condition that the electric sofa is connected to electricity. Over a long period of time, the insulating outer layer of the electric wire is worn out, causing the internal conductor to be exposed, which leads to the short circuit of the positive and negative poles of the electric wire, causing the current and voltage to be too large. This not only produces instantaneous high temperature and electric arc sparks, but also causes serious electrical faults. In addition, the sparks and high temperature are enough to ignite the flammable materials of the accessories, such as the filler and fabric inside the sofa, thereby causing the furniture to be partially burned and even causing a fire. Similarly, under the condition that an electric bed or an automatic curtain is connected to electricity, if the adjusting mechanism clamps the electric wire multiple times, the insulating outer layer of the electric wire will be damaged, and the short circuit caused by the short circuit of the positive and negative poles will also occur. At present, there are certain safety hazards in the use of existing intelligent furniture. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art, and to provide a short-circuit prevention type power supply circuit and intelligent furniture which can cut off the power supply in time when a short circuit or excessive voltage occurs, and prevent the intelligent furniture from being damaged.

[0005] The purpose of the present disclosure is achieved by the following technical solutions:

[0006] A short-circuit prevention type power supply circuit, comprising a power supply circuit and a discharge protection circuit, the input end of the power supply circuit is used to connect to alternating current, and the output negative end of the power supply circuit is used to connect to the voltage negative end of the electrical furniture; the discharge protection circuit comprises a first switch tube, a second switch tube, a general-purpose diode, a first resistor, a second resistor and a third resistor, the first end of the first switch tube is connected to the output positive end of the power supply circuit, the second end of the first switch tube is connected to the negative electrode of the general-purpose diode, and the second end of the first switch tube is also used to connect to the voltage positive end of the electrical furniture, the control end of the first switch tube is respectively connected to the first end of the first resistor and the first end of the second switch tube, the second end of the first resistor is connected to the first end of the first switch tube, the second end of the second switch tube is connected to ground, the control end of the second switch tube is respectively connected to the first end of the second resistor and the first end of the third resistor, the second end of the second resistor is connected to the positive electrode of the general-purpose diode, and the second end of the third resistor is connected to the second end of the second switch tube.

[0007] In one of the embodiments, the discharge protection circuit further comprises a fourth resistor, a first end of the fourth resistor is connected to a first end of the first resistor, and a second end of the fourth resistor is connected to a first end of the second switch tube.

[0008] In one of the embodiments, the discharge protection circuit further comprises a first capacitor, an upper half of the first capacitor is connected to a first end of the third resistor, and a lower half of the first capacitor is connected to a second end of the third resistor.

[0009] In one of the embodiments, the discharge protection circuit comprises a third switch tube and a power consumption resistor group, a first end of the power consumption resistor group is connected to an output positive terminal of the power supply circuit, a second end of the power consumption resistor group is connected to a first end of the third switch tube, a second end of the third switch tube is connected to ground, and a control end of the third switch tube is connected to a second end of the first resistor.

[0010] In one of the embodiments, the discharge protection circuit further comprises a fifth resistor, a first end of the fifth resistor is connected to a first end of the second switch tube, and a second end of the fifth resistor is connected to a control end of the third switch tube.

[0011] In one of the embodiments, the short-circuit prevention type power supply circuit further comprises an opto-coupler switching circuit, the opto-coupler switching circuit comprises a sixth resistor, a seventh resistor, a comparator, and an opto-coupler diode, a first end of the sixth resistor is connected to a power input terminal of the power supply circuit, a second end of the sixth resistor is connected to an input one end of the comparator, an output end of the comparator is connected to ground, an input two end of the comparator is connected to a negative electrode of the opto-coupler diode, a positive electrode of the opto-coupler diode is connected to a first end of the seventh resistor, and a second end of the seventh resistor is connected to a variable voltage output terminal of the power supply circuit; and,

[0012] The discharge protection circuit further comprises an opto-coupler switching tube, a light-emitting end of the opto-coupler diode is connected to a control end of the opto-coupler, an input end of the opto-coupler switching tube is connected to a control end of the third switch tube, and an output end of the opto-coupler switching tube is connected to a second end of the third switch tube.

[0013] In one of the embodiments, the opto-coupler switching circuit further comprises an eighth resistor, a first end of the eighth resistor is connected to a second end of the sixth resistor, and a second end of the eighth resistor is connected to an output end of the comparator.

[0014] In one of the embodiments, the opto-coupler switching circuit further comprises a second capacitor, an upper half of the second capacitor is connected to a first end of the eighth resistor, and a lower half of the second capacitor is connected to a second end of the eighth resistor.

[0015] In one of the embodiments, the opto-coupler switch circuit further comprises a ninth resistor, a first end of the ninth resistor is connected to the positive pole of the opto-coupler diode, and a second end of the ninth resistor is connected to the negative pole of the opto-coupler diode.

[0016] The intelligent furniture comprises a power adapter, an electric furniture, and the short-circuit prevention power supply circuit in any of the above embodiments, an input end of the power adapter is used to connect to an alternating current, an output end of the power adapter is electrically connected to a power supply end of the electric furniture, and the short-circuit prevention power supply circuit is installed in the power adapter.

[0017] Compared with the prior art, the present disclosure has at least the following advantages:

[0018] The discharge protection circuit is used to detect the voltage condition of the output positive end of the power supply circuit, and the first switch tube is turned on when the intelligent furniture is connected to the power supply. When the user adjusts the angle for many times, there is a possibility that the adjusting mechanism clamps the wire, and over a long period of time, the insulating outer layer of the wire is worn out, so that the wire is exposed. When the positive and negative poles of the exposed wire are short-circuited, the voltage of the first end of the second switch tube is too large, so that the second switch tube is cut off, and then the first switch tube is cut off, thereby preventing the electric furniture from continuing to be connected to the power supply. The above circuit can protect the electric furniture and prevent the arc spark, high temperature or even fire caused by the short circuit of the positive and negative poles of the wire. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 The circuit diagram of the short-circuit prevention power supply circuit in an embodiment;

[0021] Figure 2 The circuit diagram of the short-circuit prevention power supply circuit in an embodiment; Figure 1 The circuit diagram of the short-circuit prevention power supply circuit in an embodiment;

[0022] Figure 3 The circuit diagram of the short-circuit prevention power supply circuit in an embodiment; Figure 1 The circuit diagram of the discharge protection circuit in the short-circuit prevention power supply circuit shown in an embodiment;

[0023] Figure 4 The circuit diagram of the discharge protection circuit in the short-circuit prevention power supply circuit shown in an embodiment; Figure 1 The circuit diagram of the opto-coupler switch circuit in the short-circuit prevention power supply circuit shown in an embodiment.

[0024] Reference numerals: 10, short-circuit prevention type power supply circuit; 100, power supply circuit; 200, discharge protection circuit; 300, optocoupler switching circuit; Q6, first switching transistor; Q4, second switching transistor; Q5, third switching transistor; R48, first resistor; R50, second resistor; R51, third resistor; R49, fourth resistor; R64, fifth resistor; R42, sixth resistor; R47, seventh resistor; R45, eighth resistor; R46, ninth resistor; RE1, energy consumption resistor group; C15, first capacitor; C17, second capacitor; C13, voltage stabilizing capacitor; D11, general-purpose diode; U4, comparator; U5A, optocoupler diode; U5B, optocoupler switching transistor. DETAILED DESCRIPTION

[0025] For the purpose of promoting the understanding of the present disclosure, the present disclosure will be described in further detail below with reference to the relevant drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present disclosure can be understood more thoroughly and completely.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of the present disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure will be further described in detail below in combination with specific embodiments:

[0029] Please refer to Figures 1 to 3It is the power supply circuit 10 of preventing short circuit of one embodiment of the utility model, including power supply circuit 100 and discharge protection circuit 200, the input end of power supply circuit 100 is used to connect AC, the output negative end of power supply circuit 100 is used to connect the voltage negative end of electric furniture, discharge protection circuit 200 includes first switch tube Q6, second switch tube Q4, general diode D11, first resistance R48, second resistance R50 and third resistance R51, the first end of first switch tube Q6 connects the output positive end of power supply circuit 100, the second end of first switch tube Q6 connects the negative pole of general diode D11, and the second end of first switch tube Q6 is also used to connect the voltage positive end of electric furniture, the control end of first switch tube Q6 connects the first end of first resistance R48 and the first end of second switch tube Q4 respectively, the second end of first resistance R48 connects the first end of first switch tube Q6, the second end of second switch tube Q4 connects ground, the control end of second switch tube Q4 connects the first end of second resistance R50 and the first end of third resistance R51 respectively, the second end of second resistance R50 connects the positive pole of general diode D11, the second end of third resistance R51 connects the second end of second switch tube Q4.

[0030] In the embodiment, the discharge protection circuit is used to detect the voltage condition of the output positive end of the power supply circuit, the first switch tube is turned on in the case of the electric furniture, when the user adjusts the angle for many times, the possibility that the adjusting mechanism clamps the wire exists, in the long run, the insulating outer layer of the wire is worn out, so that the wire is exposed, when the positive and negative poles of the exposed wire are short-circuited, the voltage of the first end of the second switch tube is too large, so that the second switch tube is cut off, then the first switch tube is cut off, so as to prevent the electric furniture from continuing to be connected to the power, the above-mentioned circuit can protect the electric furniture, and prevent the arc spark, high temperature and even fire caused by the short circuit of the positive and negative poles of the wire.

[0031] It can be understood that, in combination with Figure 3 As shown in the figure, in the case of normal power supply, the first switch tube Q6 is turned on, the voltage of the PA end and the voltage of the PB end are in the normal state, when the wire is clamped by the adjusting mechanism such as iron clamp for many times, so that the insulating outer layer is damaged, the wire is exposed, in the case of the above abnormality, when the voltage positive end and the voltage negative end are short-circuited, short circuit will be caused, the overvoltage will pull up the first end level of the second switch tube Q4, so that the second switch tube Q4 is cut off, and the control end of the first switch tube Q6 is high level, so as to be cut off, so that the output voltage no longer supplies power for the electric furniture, the short circuit caused by the short circuit of the voltage positive end and the voltage negative end is avoided, so that the situation that the spark is generated and even the fire is caused is avoided.

[0032] In the embodiment, the first switch tube Q6 is a P-type MOS field effect tube, the first end is a source, the second end is a drain, and the control end is a gate; the second switch tube Q4 is an NPN type triode, the first end is a collector, the second end is an emitter, and the control end is a base.

[0033] As shown in Figure 3 one of the embodiments, the discharge protection circuit 200 further comprises a fourth resistor R49, the first end of the fourth resistor R49 is connected to the first end of the first resistor R48, and the second end of the fourth resistor R49 is connected to the first end of the second switch tube Q4. In this embodiment, the fourth resistor R49 is arranged to limit the current passing through the second switch tube Q4, prevent overcurrent from breaking the second switch tube Q4, and ensure that the output signal of the power supply circuit 100 is grounded in the case of short circuit of the positive and negative ends of the voltage, and the power supply to the consumer furniture is stopped.

[0034] As shown in Figure 3 one of the embodiments, the discharge protection circuit 200 further comprises a first capacitor C15, the upper half end of the first capacitor C15 is connected to the first end of the third resistor R51, and the lower half end of the first capacitor C15 is connected to the second end of the third resistor R51. It can be understood that the first capacitor C15 and the third resistor R51 are connected in parallel to form a capacitor-resistor circuit, wherein the third resistor R51 is used to generate a voltage drop in the case of excessive voltage, thereby ensuring that the second switch tube Q4 can be normally turned on, and the first capacitor C15 is used to store the charge of the PB end and detect the voltage condition at the PB end to prevent voltage mutation.

[0035] As shown in Figure 3 one of the embodiments, the discharge protection circuit 200 comprises a third switch tube Q5 and an energy resistor group RE1, the first end of the energy resistor group RE1 is connected to the output positive end of the power supply circuit 100, the second end of the energy resistor group RE1 is connected to the first end of the third switch tube Q5, the second end of the third switch tube Q5 is connected to the ground, and the control end of the third switch tube Q5 is connected to the second end of the first resistor R48. It can be understood that when the positive and negative poles of the lead are short-circuited, the first switch tube Q6 and the second switch tube Q4 are cut off to prevent the consumer furniture from continuing to be powered, and at the same time, the control end of the third switch tube Q5 is in a high level state, thereby being turned on, the energy resistor group RE1 absorbs the electric energy in the high voltage state and converts the electric energy into heat energy for consumption, and in addition, the third switch tube Q5 is turned on to discharge to the common ground, thereby preventing the voltage from being open in the overvoltage state.

[0036] As shown in Figure 3 one of the embodiments, the discharge protection circuit 200 further comprises a voltage stabilizing capacitor C13, the upper half end of the voltage stabilizing capacitor C13 is connected to the first end of the fourth resistor R49, and the lower half end of the voltage stabilizing capacitor C13 is connected to the ground. It can be understood that the voltage stabilizing capacitor C13 and the fourth resistor R49 are in parallel relationship, which can stabilize the output voltage of the power supply circuit 100 to prevent the output voltage from being suddenly changed.

[0037] In this embodiment, the third switch tube Q5 is an N-type MOS field effect tube, the first end of which is the drain, the second end is the source, and the control end is the gate.

[0038] like Figure 3 As shown, in one embodiment, the discharge protection circuit 200 further includes a fifth resistor R64. The first end of the fifth resistor R64 is connected to the first end of the second switch Q4, and the second end of the fifth resistor R64 is connected to the control terminal of the third switch Q5. It can be understood that the fifth resistor R64 further limits the current passing through the control terminal of the third switch Q5, preventing excessive current from causing breakdown and thus protecting the third switch Q5.

[0039] like Figure 4 As shown, in one embodiment, the short-circuit protection power supply circuit 10 further includes an optocoupler switch circuit 300. The optocoupler switch circuit 300 includes a sixth resistor R42, a seventh resistor R47, a comparator U4, and an optocoupler diode U5A. The first end of the sixth resistor R42 is connected to the power input terminal of the power supply circuit 100, the second end of the sixth resistor R42 is connected to one input terminal of the comparator U4, the output terminal of the comparator U4 is grounded, the second input terminal of the comparator U4 is connected to the negative terminal of the optocoupler diode U5A, the positive terminal of the optocoupler diode U5A is connected to the first end of the seventh resistor R47, and the second end of the seventh resistor R47 is connected to the transformer output terminal of the power supply circuit 100. The discharge protection circuit 200 further includes an optocoupler switch U5B. The light-emitting end of the optocoupler diode U5A is connected to the control terminal of the optocoupler, the input terminal of the optocoupler switch U5B is connected to the control terminal of the third switch Q5, and the output terminal of the optocoupler switch U5B is connected to the second terminal of the third switch Q5.

[0040] It is understandable that when the furniture is powered normally, the optocoupler switch circuit 300 does not work. Specifically, comparator U4 compares the input voltage and the output voltage. When the output voltage is normal, comparator U4 outputs a low-level signal, and no current flows through optocoupler diode U5A. At this time, optocoupler switch U5B and the third switch Q5 are both in the off state. When the wire is exposed and its positive and negative terminals are shorted, a very large voltage will be generated, which will turn off the second switch Q4 and the first switch Q6 in sequence. When comparator U4 detects the voltage at this point, it outputs a high-level signal, and current flows through optocoupler diode U5A, causing optocoupler switch U5B to conduct, thereby achieving the effect of discharging when there is overvoltage and preventing damage to the furniture caused by voltage discharge. In this embodiment, the input terminal of optocoupler switch U5B is the collector, and the output terminal of optocoupler switch U5B is the emitter.

[0041] like Figure 4As shown, in one embodiment, the optocoupler switch circuit 300 further includes an eighth resistor R45. The first end of the eighth resistor R45 is connected to the second end of the sixth resistor R42, and the second end of the eighth resistor R45 is connected to the output of the comparator U4. In this embodiment, the two ends of the eighth resistor R45 are connected to the output and one input of the comparator U4, so that the output level signal can be fed back to the input of the comparator U4 as a reference level.

[0042] like Figure 4 As shown, in one embodiment, the optocoupler switch circuit 300 further includes a second capacitor C17. The upper half of the second capacitor C17 is connected to the first terminal of the eighth resistor R45, and the second terminal of the second capacitor C17 is connected to the second terminal of the eighth resistor R45. It can be understood that the eighth resistor R45 and the second capacitor C17 are connected in parallel to form a parallel circuit. The two ends of the eighth resistor R45 are connected to the output and one input terminal of the comparator U4 to provide voltage output feedback. The second capacitor C17 is used to stabilize the voltage and prevent sudden voltage changes from damaging components.

[0043] like Figure 4 As shown, in one embodiment, the optocoupler switch circuit 300 further includes a ninth resistor R46. The first end of the ninth resistor R46 is connected to the positive terminal of the optocoupler diode U5A, and the second end of the ninth resistor R46 is connected to the negative terminal of the optocoupler diode U5A. In this embodiment, the ninth resistor R46 is connected in parallel with the optocoupler diode U5A so that the ninth resistor R46 shunts the current at the power input terminal of the power supply circuit 100. That is, in the event of a short circuit, part of the current flows through the ninth resistor R46, and the remaining part of the current flows through the optocoupler diode U5A. This prevents the current passing through the optocoupler diode U5A from becoming too large and damaging it, thus preventing the optocoupler switch U5B from conducting normally. This ensures that the optocoupler can discharge to ground normally in the event of a short circuit.

[0044] This disclosure also provides a smart furniture, including a power adapter, the furniture itself, and a short-circuit protected power supply circuit 10 according to any of the above embodiments. The input terminal of the power adapter is used to connect to AC power, and the output terminal of the power adapter is electrically connected to the power supply terminal of the furniture. The short-circuit protected power supply circuit 10 is installed inside the power adapter. When the smart furniture uses the short-circuit protected power supply circuit 10, if the positive and negative terminals of the smart furniture's wires are short-circuited, the comparator U4 detects an excessive voltage and outputs a high-level signal to ground, causing the optocoupler output transistor U5B to conduct, thereby turning on the third switch transistor Q5 to ground the overvoltage signal. During this period, the first switch transistor Q6 and the second switch transistor Q4 are cut off. When a reset is required, simply unplug and replug the plug to power the furniture. The power supply circuit 100, the discharge protection circuit 200, and the optocoupler switch circuit 200 are integrated into a single unit to form the short-circuit protected power supply circuit 10, which is installed inside the power adapter.

[0045] Of course, in another embodiment, the power adapter comprises an adapter body and a circuit breaker, the power supply circuit 100 is installed in the adapter body, the optocoupler switch circuit 200 and the discharge protection circuit 300 are installed in the circuit breaker, and the circuit breaker is detachably installed on the adapter body, specifically, the circuit breaker is detachably installed on the voltage output end of the adapter body. In this way, when the circuit breaker has a functional failure or a damaged component, the user can detach the circuit breaker from the adapter body and replace it with a new one, thereby improving the convenience of replacing the circuit breaker.

[0046] Compared with the prior art, the present disclosure has at least the following advantages:

[0047] The discharge protection circuit is used to detect the voltage condition of the positive output end of the power supply circuit. In the case of power connection of smart furniture, the first switch tube is turned on. When the user adjusts the angle multiple times, there is a possibility that the adjustment mechanism will pinch the wire. Over a long period of time, the insulating outer layer of the wire is worn out, causing the wire to be exposed. When the positive and negative poles of the exposed wire are short-circuited, the voltage at the first end of the second switch tube is too high, thereby being cut off. Subsequently, the first switch tube is cut off, preventing the electric appliance furniture from continuing to be powered. The above-mentioned circuit can protect the electric appliance furniture and prevent the situation of arc spark, high temperature or even fire caused by the short circuit of the positive and negative poles of the wire.

[0048] The above-described embodiments only express several embodiments of the present disclosure, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the disclosed patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present disclosure, a number of modifications and improvements can be made, which are within the scope of protection of the present disclosure. Therefore, the protection scope of the present disclosure patent should be subject to the appended claims.

Claims

1. A short-circuit prevention type power supply circuit characterized by comprising: The application relates to a short-circuit protection type power supply circuit. The short-circuit protection type power supply circuit comprises a power supply circuit, a discharge protection circuit, a light-coupled switch circuit and a light-coupled switch tube. The power supply circuit is connected with an alternating current and has an output negative terminal for connecting with a voltage negative terminal of an electrical furniture.

2. The short-circuit prevention power supply circuit according to claim 1, characterized by The discharge protection circuit comprises a first switch tube, a second switch tube, a general diode, a first resistor, a second resistor and a third resistor.

3. The short-circuit prevention power supply circuit according to claim 1, characterized by The first end of the first switch tube is connected with the output positive terminal of the power supply circuit.

4. The short-circuit prevention power supply circuit according to claim 1, characterized by The second end of the first switch tube is connected with the negative terminal of the general diode and the voltage positive terminal of the electrical furniture.

5. The short-circuit prevention power supply circuit according to claim 4, characterized by The control end of the first switch tube is connected with the first end of the first resistor and the first end of the second switch tube.

6. The short-circuit prevention power supply circuit according to claim 4, wherein The second end of the first resistor is connected with the first end of the first switch tube. The second end of the second switch tube is connected with the ground.

7. The short-circuit prevention power supply circuit according to claim 6, wherein The control end of the second switch tube is connected with the first end of the second resistor and the first end of the third resistor.

8. The short-circuit prevention power supply circuit according to claim 7, wherein The second end of the second resistor is connected with the positive terminal of the general diode. The second end of the third resistor is connected with the second end of the second switch tube. The discharge protection circuit further comprises a fourth resistor. The first end of the fourth resistor is connected with the first end of the first resistor. The second end of the fourth resistor is connected with the first end of the second switch tube. The discharge protection circuit further comprises a first capacitor. The upper half end of the first capacitor is connected with the first end of the third resistor. The lower half end of the first capacitor is connected with the second end of the third resistor. The discharge protection circuit comprises a third switch tube and an energy consumption resistor group. The first end of the energy consumption resistor group is connected with the output positive terminal of the power supply circuit. The second end of the energy consumption resistor group is connected with the first end of the third switch tube. The second end of the third switch tube is connected with the ground. The control end of the third switch tube is connected with the second end of the first resistor. The discharge protection circuit further comprises a fifth resistor. The first end of the fifth resistor is connected with the first end of the second switch tube. The second end of the fifth resistor is connected with the control end of the third switch tube. The light-coupled switch circuit comprises a sixth resistor, a seventh resistor, a comparator and a light-coupled diode. The first end of the sixth resistor is connected with the power input terminal of the power supply circuit. The second end of the sixth resistor is connected with the input one end of the comparator. The output end of the comparator is connected with the ground. The input two end of the comparator is connected with the negative terminal of the light-coupled diode. The positive terminal of the light-coupled diode is connected with the first end of the seventh resistor. The second end of the seventh resistor is connected with the voltage output terminal of the power supply circuit. The light-coupled diode of the light-coupled switch tube is connected with the control end of the light-coupled switch tube. The input end of the light-coupled switch tube is connected with the control end of the third switch tube. The output end of the light-coupled switch tube is connected with the second end of the third switch tube. The light-coupled switch circuit further comprises an eighth resistor. The first end of the eighth resistor is connected with the second end of the sixth resistor. The second end of the eighth resistor is connected with the output end of the comparator. The light-coupled switch circuit further comprises a second capacitor. The upper half end of the second capacitor is connected with the first end of the eighth resistor. The second end of the second capacitor is connected with the second end of the eighth resistor.

9. The short-circuit prevention power supply circuit according to claim 6, wherein The photocoupling switch circuit further comprises a ninth resistor, a first end of the ninth resistor being connected to the positive pole of the photocoupling diode, and a second end of the ninth resistor being connected to the negative pole of the photocoupling diode.

10. An intelligent furniture, characterized by, The application further provides a power supply adapter, a power-consuming furniture and the short-circuit prevention power supply circuit as claimed in any one of claims 1-9. The input end of the power supply adapter is used for connecting to alternating current. The output end of the power supply adapter is electrically connected to the power supply end of the power-consuming furniture. The short-circuit prevention power supply circuit is installed in the power supply adapter.

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