CN215186687U

CN215186687U - Switch and electrical equipment

Info

Publication number: CN215186687U
Application number: CN202120941052.4U
Authority: CN
Inventors: 马山; 陈刚; 尤德华; 叶志鹏
Original assignee: Ningbo Gongniu Electric Appliances Co Ltd
Current assignee: Ningbo Gongniu Electric Appliances Co Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-12-14
Anticipated expiration: 2031-04-30

Abstract

The utility model provides a switch (00) and electrical equipment belongs to electron technical field. The switch (00) comprises a control circuit (02) and a relay circuit (03). After receiving a starting instruction, the control circuit (02) transmits a conducting signal to the relay circuit (03) when detecting that the potential output to the relay circuit (03) is greater than a potential threshold value and a power supply signal zero crossing point provided by a power supply (AC); therefore, the relay circuit (03) is controlled to be conducted at the moment, and the electric energy consumption of the relay circuit (03) can be effectively reduced.

Description

Switch and electrical equipment

Technical Field

The utility model relates to the field of electronic technology, in particular to switch and electrical equipment.

Background

A switch is an electronic component used to control the on-off state between a power source (e.g., mains) and a load.

In the related art, the switch generally includes: a control circuit and a relay circuit. The control circuit is electrically connected with an external power supply and the relay circuit respectively, and the control circuit is used for transmitting a conducting signal to the relay circuit when a power supply signal provided by the power supply crosses a zero point after receiving a starting instruction for indicating to start the switch. The relay circuit is also electrically connected with the power supply and the load respectively, and the relay circuit is used for conducting the power supply and the load under the drive of the received conducting signal so as to enable the load to work under the drive of the power supply signal provided by the power supply.

However, since the control circuit in the related art determines whether it is necessary to transmit the turn-on signal to the relay circuit only based on whether the power supply signal crosses zero, it is not further detected whether the load has been successfully connected to the power supply circuit. Therefore, the relay circuit works under the control of the conducting signal transmitted by the control circuit when the load is not connected. This phenomenon results in a large power consumption of the relay circuit.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a switch and electrical equipment can solve the great problem of relevant technology relay's electric energy consumption. The technical scheme is as follows:

in one aspect, a switch is provided, the switch comprising: the power supply circuit, the control circuit and the relay circuit;

the power taking circuit is electrically connected with the power supply, the control circuit and the relay circuit respectively, and is used for reducing the potential of a power supply signal provided by the power supply and then transmitting the power supply signal to the control circuit and the relay circuit respectively;

the control circuit is also electrically connected with the relay circuit and the power supply respectively, and is used for transmitting a conducting signal to the relay circuit after receiving a starting instruction if detecting that the potential output to the relay circuit is greater than a potential threshold value and when a power supply signal provided by the power supply to the relay circuit crosses a zero point;

the relay circuit is also electrically connected with the power supply and the load respectively, and the relay circuit is used for responding to the conducting signal and conducting the power supply and the load.

Optionally, the control circuit includes: a load detection sub-circuit, a zero-crossing detection sub-circuit and a control sub-circuit;

the power taking circuit is electrically connected with the control sub-circuit and is used for reducing the potential of a power supply signal provided by the power supply and transmitting the power supply signal to the control sub-circuit;

the load detection sub-circuit is electrically connected with the relay circuit and the control sub-circuit respectively, and is used for collecting the electric potential output by the relay circuit and transmitting the electric potential output by the relay circuit to the control sub-circuit;

the zero-crossing detection sub-circuit is electrically connected with the power supply and the control sub-circuit respectively, and is used for collecting a power supply signal provided by the power supply and transmitting the power supply signal to the control sub-circuit;

the control sub-circuit is electrically connected with the relay circuit, and is used for transmitting the conducting signal to the relay circuit after receiving the starting instruction if detecting that the potential output to the relay circuit is larger than the potential threshold value and when the power supply signal provided by the power supply to the relay circuit crosses the zero point.

Optionally, the load detection sub-circuit includes: the rectifier diode, the first voltage-dividing resistor, the second voltage-dividing resistor and the first filter capacitor;

a first pole of the rectifier diode is electrically connected with the relay circuit, and a second pole of the rectifier diode is electrically connected with a first end of the first divider resistor;

the second end of the first divider resistor, the first end of the first filter capacitor and the first end of the second divider resistor are electrically connected with the control sub-circuit;

the second end of the first filter capacitor and the second end of the second divider resistor are both electrically connected with a pull-down power supply end.

Optionally, the zero-crossing detection sub-circuit includes: the third voltage dividing resistor, the fourth voltage dividing resistor and the second filter capacitor;

a first end of the third voltage dividing resistor is electrically connected with the power supply, and a second end of the third voltage dividing resistor, a first end of the second filter capacitor and a first end of the fourth voltage dividing resistor are electrically connected with the control sub-circuit;

and the second end of the second filter capacitor and the second end of the fourth divider resistor are both electrically connected with a pull-down power supply end.

Optionally, the power supply circuit is electrically connected to the power supply through a live wire and a zero line, the live wire is an internal ground end, the relay circuit includes a ground end, and the ground end is electrically connected to the live wire.

Optionally, get the electric circuit and include: a first buck sub-circuit and a second buck sub-circuit;

the first voltage reduction sub-circuit is electrically connected with the power supply, the relay circuit and the second voltage reduction sub-circuit respectively, and the first voltage reduction sub-circuit is used for reducing a power supply signal of a first potential provided by the power supply to a second potential and then transmitting the power supply signal to the relay circuit and the second voltage reduction sub-circuit respectively;

the second voltage reduction sub-circuit is electrically connected with the control circuit and is used for reducing the power supply signal of the second potential to a third potential and then transmitting the power supply signal to the control circuit.

Optionally, the first voltage-reducing sub-circuit includes: the protection sub-circuit, the half-wave rectifier sub-circuit, the filter sub-circuit and the chopper voltage reduction sub-circuit;

the protection sub-circuit is electrically connected with the power supply and the half-wave rectifier sub-circuit respectively, and is used for transmitting a power supply signal of a first potential provided by the power supply to the half-wave rectifier sub-circuit and performing overcurrent and overvoltage protection on the transmitted power supply signal;

the half-wave rectifier sub-circuit is also electrically connected with the filter sub-circuit and is used for rectifying the received power supply signal and transmitting the rectified power supply signal to the filter sub-circuit;

the filtering sub-circuit is electrically connected with the chopping buck sub-circuit and is used for filtering the received power supply signal and transmitting the filtered power supply signal to the chopping buck sub-circuit;

the chopping voltage reduction sub-circuit is electrically connected with the relay circuit and the second voltage reduction sub-circuit respectively, and the chopping voltage reduction sub-circuit is used for chopping and reducing voltage of the received power supply signal and then transmitting the power supply signal to the relay circuit and the second voltage reduction sub-circuit respectively.

Optionally, the protection sub-circuit includes: self-healing fuses and piezoresistors; the half-wave rectifier sub-circuit includes: a first diode; the filtering sub-circuit comprises: the first capacitor, the second capacitor and the first inductor; the chopping buck sub-circuit comprises: the chopper circuit comprises a chopper chip, a third capacitor, a fourth capacitor, a second inductor, a first resistor, a second resistor, a third resistor, a second diode and a third diode;

the first end of the self-recovery fuse is electrically connected with the power supply, the second end of the self-recovery fuse and the first end of the piezoresistor are both electrically connected with the first pole of the first diode, and the second end of the piezoresistor is electrically connected with the pull-down power supply end;

the second pole of the first diode and the first end of the first capacitor are both electrically connected with the first end of the first inductor;

the second end of the first inductor and the first end of the second capacitor are both electrically connected with the chopping chip, and the second end of the first capacitor and the second end of the second capacitor are both electrically connected with the pull-down power supply end;

the first end of the first resistor and the first end of the second resistor are both electrically connected with the chopping chip; the second end of the first resistor and the second end of the second resistor are respectively and electrically connected with the chopping chip and the second pole of the second diode; the first end of the third capacitor and the second pole of the third diode are both electrically connected with the chopping chip; a first pole of the third diode, a first end of the second inductor, a first end of the third resistor and a first end of the fourth capacitor are electrically connected with the relay circuit and the second buck sub-circuit respectively; a second end of the third capacitor and a second end of the second inductor are both electrically connected with a second pole of the second diode; the first pole of the second diode, the second end of the third resistor and the second end of the fourth capacitor are electrically connected with the pull-down power supply end.

Optionally, the second voltage-reducing sub-circuit includes: a fifth capacitor, a voltage reduction chip, a sixth capacitor and a seventh capacitor;

the first end of the fifth capacitor and the input end of the voltage reduction chip are both electrically connected with the first voltage reduction sub-circuit;

the first end of the sixth capacitor, the first end of the seventh capacitor and the output end of the voltage reduction chip are electrically connected with the control circuit;

the second end of the fifth capacitor, the second end of the sixth capacitor, the second end of the seventh capacitor and the grounding end of the voltage reduction chip are electrically connected with a pull-down power supply end.

In another aspect, an electrical apparatus is provided, the electrical apparatus including: a load, and a switch as described in the above aspect;

the switch is respectively electrically connected with the load and the power supply, and the switch is used for controlling the on-off state between the load and the power supply.

The embodiment of the utility model provides a technical scheme's beneficial effect can include at least:

the embodiment of the utility model provides a switch and electrical equipment, the switch includes control circuit and relay circuit. After receiving a starting instruction, the control circuit transmits a conducting signal to the relay circuit if detecting that the potential output by the relay circuit is greater than a potential threshold value and when a power supply signal provided by a power supply to the relay circuit crosses a zero point; therefore, the relay circuit is controlled to be switched on, and the electric energy consumption of the relay circuit can be effectively reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to be able to obtain other drawings according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a switch according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another switch provided in the embodiment of the present invention;

fig. 3 is a schematic structural diagram of another switch provided in the embodiment of the present invention;

fig. 4 is a schematic structural diagram of another switch according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a load detection sub-circuit according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a zero-crossing detection sub-circuit according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of another switch according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a first buck sub-circuit according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of another first buck sub-circuit according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a second buck sub-circuit according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a relay circuit according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a circuit including a plurality of relays according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a load detection sub-circuit according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a control sub-circuit according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of another switch according to an embodiment of the present invention;

fig. 16 is a schematic structural diagram of an electrical apparatus according to an embodiment of the present invention.

The various reference numbers in the drawings are illustrated below:

AC-power, 00-switch, 10-load;

01-power-taking circuit, 02-control circuit, 03-relay circuit, L-live wire and N-zero wire;

021-load detection subcircuit, 022-zero crossing detection subcircuit, 023-control subcircuit, 011-first step-down subcircuit, 012-second step-down subcircuit, 031-relay drive circuit, 032-relay;

0111-a protection sub-circuit, 0112-a half-wave rectifier sub-circuit, 0113-a filter sub-circuit, 0114-a chopper step-down sub-circuit;

device identification in the load detection subcircuit 021 and the zero crossing detection subcircuit 022: d1-rectifier diode, R1-first divider resistor, R2-second divider resistor, R3-third divider resistor, R4-fourth divider resistor, C1-first filter capacitor and C2-second filter capacitor;

device identification in control subcircuit 023: PW 1-a power supply terminal, OUT 1-an output terminal, PWR _ D-a first sampling terminal, SYNC-a second sampling terminal and J1B-a control chip;

device identification in the first buck subcircuit 011: p1-self-recovery fuse, R00-voltage dependent resistor, D01-first diode, D02-second diode, D03-third diode, R01-first resistor, R02-second resistor, R03-third resistor, C01-first capacitor, C02-second capacitor, C03-third capacitor, C04-fourth capacitor, L01-first inductor, L02-second inductor and U1-chopper chip;

the device identifier in the second voltage dropping sub-circuit 012: u2-voltage reduction chip, C05-fifth capacitor, C06-sixth capacitor, C07-seventh capacitor, IN 0-input end, OUT 0-output end and V1-ground end;

device identification in relay circuit 03: r10, R11-resistor, D10-diode, L11-coil, P11 and P12-contacts, M11-transistor, F1-fuse, PW 2-power supply terminal, OUT 2-output terminal, ON 1-control terminal, and V0-ground terminal.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 is a schematic structural diagram of a switch according to an embodiment of the present invention. As shown in fig. 1, the switch 00 includes: the power supply circuit 01, the control circuit 02 and the relay circuit 03.

Wherein, should get electric circuit 01 and can be connected with power AC, control circuit 02 and relay circuit 03 electric connection respectively. The control circuit 02 may be electrically connected to the relay circuit 03 and the power source AC, respectively. The relay circuit 03 may also be electrically connected to the power source AC and the load 10, respectively.

The power taking circuit 01 can be used for respectively transmitting the potential of a power supply signal provided by a power supply AC to the control circuit 02 and the relay circuit 03 after the potential of the power supply signal is reduced, so as to drive the control circuit 02 and the relay circuit 03 to work.

The control circuit 02 may be configured to transmit a turn-on signal to the relay circuit 03 when it is detected that the potential outputted thereto by the relay circuit 03 is greater than the potential threshold value after receiving a turn-on instruction (i.e., an instruction instructing the switch to be turned on), and when a zero-crossing point of a power supply signal supplied thereto by the power supply AC is detected.

The relay circuit 03 may be configured to conduct the power AC to the load 10 at zero crossings of the power signal in response to the conduction signal.

In addition, the power signal provided by the power source AC according to the embodiment of the present invention may be an AC signal. For example, the power source AC may be a commercial power, and thus, the power signal provided by the power source AC is a power frequency AC signal with a voltage of 220 volts (V). Of course, the power source AC may be an AC power source configured specifically in the switch 00 for supplying an AC signal instead of the commercial power. Based on this, the power supply signal zero crossing point may refer to: during a cycle, the power signal transitions from the positive half cycle to the negative half cycle, or from the negative half cycle to the critical point of the positive half cycle. That is, the point at which the voltage of the power supply signal is 0.

It should be further noted that, in the embodiment of the present invention, the potential output from the relay circuit 03 to the control circuit 02 is greater than the potential threshold, which can be used to indicate: the load 10 has been successfully switched into the circuit formed by the relay circuit 03 and the mains AC. And the potential threshold value may be a value previously arranged in the control circuit 02.

By way of example, the control circuit 02 may comprise a comparator. After receiving the start command, the control circuit 02 may compare the magnitude relationship between the potential output from the relay circuit 03 and the potential threshold stored in the relay circuit by using a comparator. If the comparison result is that the potential output to the relay circuit 03 is greater than the potential threshold, the control circuit 02 may determine that the load 10 has been successfully connected at this time. Then, the control circuit 02 may further transmit a turn-on signal to the relay circuit 03 when the power supply signal supplied thereto from the power supply AC crosses zero. The relay circuit 03 can conduct the power supply AC to the load 10 under the control of the conduction signal. In this way, the power signal provided by the power source AC can be transmitted to the load 10 through the relay circuit 03, and the load 10 operates under the driving of the power signal provided by the power source AC. If the comparison result is that the potential transmitted to it by the relay circuit 03 is less than or equal to the potential threshold, the control circuit 02 may determine that the load 10 is not successfully connected. At this time, the control circuit 02 does not transmit the on signal to the relay circuit 03 regardless of whether the power supply signal supplied thereto by the power supply AC crosses zero. That is, the relay circuit 03 does not conduct the power supply AC to the load 10.

Alternatively, as can be seen from the structural schematic diagram of another switch shown in fig. 2, the relay circuit 03 according to the embodiment of the present invention may include a relay driving circuit 031 and a relay 032. Therein, relay 032 may have two contacts (not shown in fig. 2). Get electric circuit 01 and control circuit 02 all can with relay drive circuit 031 electric connection, relay drive circuit 031 can with relay 032 electric connection, two contacts of relay 032 respectively with power AC and load 10 electric connection.

The power-taking circuit 01 may reduce the potential of the power signal provided by the power supply AC and transmit the reduced potential to the relay driving circuit 031. The control circuit 02 may transmit a turn-on signal to the relay drive circuit 031. The relay driver circuit 031 may control the two contacts of the relay 032 to close in response to the on signal. After the two contacts are closed, the power source AC and the load 10, which are electrically connected to the two contacts, can be reliably conducted.

Through testing, if the two contacts are closed instantly, the current flowing through the contacts is large, the contact welding phenomenon can be caused to happen to the contacts, and then the contacts can not be disconnected any more. Therefore, when the control circuit 02 is set at the zero crossing point of the power signal provided by the power AC, the relay circuit 03 is driven to conduct the power AC and the load 10, that is, two contacts of the relay 032 in the relay circuit 03 are driven to be closed, so that the impact of the current on the contacts can be effectively reduced, and the contact welding phenomenon of the contacts can be effectively avoided. This control approach may also be referred to as a zero-crossing firing technique.

In addition, the relay circuit 03 is driven to conduct the power supply AC to the load 10 by the setting control circuit 02 after determining that the load 10 is successfully connected. In other words, when the load 10 is not successfully accessed, the control circuit 02 does not transmit the on signal to the relay circuit 03, and the relay circuit 03 does not conduct the power supply AC to the load 10. Therefore, the relay circuit 03 can be ensured to be kept in the off state when no load 10 is connected, and the power consumption of the relay circuit 03 is effectively reduced.

That is, the embodiment of the utility model provides a control circuit 02 of record not only controls relay circuit 03's control flexibility higher, can effectively reduce relay circuit 03's power consumption when reliably avoiding relay circuit 03 relay 032's contact to take place contact butt fusion phenomenon moreover. It is understood that the transmission of the on signal to the relay circuit 03 by the control circuit 02 at the zero-crossing of the power supply signal supplied thereto by the power supply AC may refer to: the control circuit 02 transmits a turn-on signal to the relay circuit 03 in a preset time period before and after a zero-crossing point of a power supply signal supplied thereto from the power supply AC. Optionally, the contacts of the relay in the relay circuit 03 may be turned on at a suitable time before and after the zero-crossing point of the power AC, and the suitable time period is generally about several milliseconds, for example, may be 1.5 milliseconds. Optionally, the switch described in the embodiment of the present invention may be a mechanical switch controlled by a mechanical touch manner, and accordingly, the opening command may be triggered by a touch operation (e.g., a pressing operation or a rotating operation) for the switch. Alternatively, the switch may be a smart switch capable of remote control, and accordingly, the turn-on command may be triggered by a remote control device (e.g., a remote controller or a terminal) communicatively connected to the switch. Of course, for an intelligent switch configured with a switch control member (e.g., a button), the turn-on command may also be triggered by a touch operation on the switch control member.

To sum up, the embodiment of the utility model provides a switch, this switch includes relay and control circuit. After the control circuit receives the starting instruction, when the control circuit detects that the potential output to the control circuit by the relay circuit is larger than the potential threshold value and detects the zero crossing point of a power supply signal provided by the power supply to the control circuit, the control circuit drives the relay circuit to conduct the power supply and the load. Therefore, the electric energy consumption of the relay circuit can be effectively reduced.

Fig. 3 is a schematic structural diagram of another switch according to an embodiment of the present invention. As shown in fig. 3, the control circuit 02 may include: a load detection sub-circuit 021, a zero crossing detection sub-circuit 022, and a control sub-circuit 023.

The power-taking circuit 01 may be electrically connected to the control sub-circuit 023. The power-taking circuit 01 can be used to reduce the voltage level of the power signal provided by the power AC and transmit the reduced voltage level to the control sub-circuit 023 to drive the control sub-circuit 023 to operate.

The load detection sub-circuit 021 may be electrically connected to the relay circuit 03 and the control sub-circuit 023, respectively. The load detection sub-circuit 021 can be used for collecting the potential output by the relay circuit 03 and transmitting the potential output by the relay circuit 03 to the control sub-circuit 023.

The zero crossing detection sub-circuit 022 may be electrically connected to the power supply AC and the control sub-circuit 023, respectively. The zero crossing detection sub-circuit 022 may be configured to collect a power signal provided by the power AC and transmit the power signal to the control sub-circuit 023.

The control sub-circuit 023 may also be electrically connected to the relay circuit 03. The control sub-circuit 023 may be configured to transmit a turn-on signal to the relay circuit 03 when detecting that the potential outputted thereto by the relay circuit 03 is greater than the potential threshold value after receiving the turn-on command and when the power supply signal supplied thereto by the power supply AC crosses the zero point.

Taking the switches shown in fig. 2 and 3 as an example, fig. 4 shows a schematic structural diagram of another switch provided by an embodiment of the present invention. As shown in fig. 4, the power-taking circuit 01 may be electrically connected to the power supply AC through the live line L and the neutral line N, and accordingly, the power-taking circuit 01 may also be referred to as a zero-fire power-taking circuit. And the live line L may serve as an internal ground GND. The control sub-circuit 023 may have a first sampling terminal PWR _ D, a second sampling terminal SYNC, a power supply terminal PW1, and an output terminal OUT 1. The relay drive circuit 031 in the relay circuit 03 may have a power supply terminal PW2 and a control terminal ON1, and the relay 032 in the relay circuit 03 may have a ground terminal V0 and an output terminal OUT 2. The ground terminal V0 and the output terminal OUT2 can be two contacts included in the relay 032.

As can be seen by referring to fig. 4, the load 10 may be disposed on the neutral line N and may be electrically connected to the output terminal OUT2 of the relay 032. Ground terminal V0 of relay 032 may be connected to power line L as an internal ground terminal. The power taking circuit 01 can be electrically connected with a power supply terminal PW1 of the control sub-circuit 023 and a power supply terminal PW2 of the relay drive circuit 03 respectively. The load detection sub-circuit 021 may be electrically connected to the first sampling terminal PWR _ D of the control sub-circuit 023 and the output terminal OUT2 of the relay 032, respectively. The zero-cross detection sub-circuit 022 may be electrically connected to the second sampling terminal SYNC of the control sub-circuit 023 and the power supply AC, respectively. Since the live line L is multiplexed as the ground, the internal structure of the switch 00 can be simplified. Of course, the switch 00 may be provided with a ground terminal separately for electrically connecting the ground terminal V0 of the relay circuit 03.

Optionally, referring to fig. 4, it can be seen that the zero-cross detection sub-circuit 022 is directly electrically connected to the zero line N, and is indirectly electrically connected to the live line L through the power-taking circuit 01.

Optionally, fig. 5 is a schematic structural diagram of a load detection sub-circuit 021 according to an embodiment of the present invention. As shown in fig. 5, the load detection sub-circuit 021 may include: rectifier diode D1, first divider resistance R1, second divider resistance R2 and first filter capacitance C1.

A first pole of the rectifying diode D1 may be electrically connected to the relay circuit 03, and a second pole of the rectifying diode D1 may be electrically connected to a first end of the first voltage-dividing resistor R1. The second terminal of the first voltage-dividing resistor R1, the first terminal of the first filter capacitor C1, and the first terminal of the second voltage-dividing resistor R2 may all be electrically connected to the control sub-circuit 023. The second terminal of the first filter capacitor C1 and the second terminal of the second voltage-dividing resistor R2 may be both electrically connected to a pull-down power source terminal (e.g., the ground terminal GND shown in fig. 5).

Alternatively, taking the structure shown in fig. 4 as an example, in the load detection sub-circuit 021 shown in fig. 5, the first pole of the rectifying diode D1 is actually electrically connected to the output terminal OUT2 of the relay 032. The second terminal of the first voltage-dividing resistor R1, the first terminal of the first filter capacitor C1, and the first terminal of the second voltage-dividing resistor R2 are electrically connected to the first sampling terminal PWR _ D of the control sub-circuit 023.

Optionally, the load detection sub-circuit 021 may include a plurality of first serially connected voltage-dividing resistors R1, and a plurality of second serially connected voltage-dividing resistors R2. For example, fig. 5 shows a total of three first voltage dividing resistors R1 connected in series. Optionally, the rectifying diode D1 in the load detection sub-circuit 021 may be located in front of, in the middle of, or behind the plurality of first voltage-dividing resistors R1, and the position of the rectifying diode D1 does not affect the sampling result.

Based on the structure of load detection subcircuit 021 can know, the utility model discloses the load detection subcircuit 021 of embodiment record can be with the potential rectification of relay circuit 03 output, filtering and partial pressure after, transmit to control subcircuit 023. In this way, it is ensured that the control sub-circuit 023 can reliably and stably receive the potential output by the relay circuit 03.

Optionally, fig. 6 is a schematic structural diagram of a zero-crossing detection sub-circuit 022 according to an embodiment of the present invention. As shown in fig. 6, the zero crossing detection sub-circuit 022 may include: a third voltage dividing resistor R3, a fourth voltage dividing resistor R4 and a second filter capacitor C2.

A first terminal of the third voltage dividing resistor R3 may be electrically connected to the power AC, and a second terminal of the third voltage dividing resistor R3, a first terminal of the second filter capacitor C2, and a first terminal of the fourth voltage dividing resistor R4 may be electrically connected to the control sub-circuit 023. The second terminal of the second filter capacitor C2 and the second terminal of the fourth voltage-dividing resistor R4 may be both electrically connected to a pull-down power source terminal (e.g., the ground terminal GND shown in fig. 6).

Optionally, taking the structure shown in fig. 4 as an example, in the zero-cross detection sub-circuit 022 shown in fig. 6, the second terminal of the third voltage dividing resistor R3, the first terminal of the second filter capacitor C2, and the first terminal of the fourth voltage dividing resistor R4 are actually electrically connected to the second sampling terminal SYNC of the control sub-circuit 023.

Alternatively, the zero crossing detection sub-circuit 022 may include a plurality of third voltage dividing resistors R3 connected in series, and a plurality of fourth voltage dividing resistors R4 connected in series. For example, fig. 6 shows three third voltage dividing resistors R3 connected in series.

Based on zero cross detection subcircuit 022's structure can know, the embodiment of the utility model provides a zero cross detection subcircuit 022 can transmit to control subcircuit 023 after power signal partial pressure and the filtering that power AC provided. In this way, it is ensured that the control sub-circuit 023 can reliably and stably receive the power supply signal. Of course, the zero crossing detection sub-circuit 022 may also include a rectifying diode to rectify the power supply signal.

Optionally, fig. 7 is a schematic structural diagram of another switch provided in the embodiment of the present invention. As shown in fig. 7, the power supply circuit 01 may include: a first voltage-dropping sub-circuit 011 and a second voltage-dropping sub-circuit 012.

The first voltage-reducing sub-circuit 011 can be electrically connected to the power source AC, the relay circuit 03 and the second voltage-reducing sub-circuit 012. The first voltage-reducing sub-circuit 011 can be used for reducing a power signal at a first potential provided by the power AC to a second potential and then transmitting the power signal to the relay circuit 03 and the second voltage-reducing sub-circuit 012 respectively.

The second voltage dropping sub-circuit 012 can also be electrically connected to the control circuit 02. The second voltage dropping sub-circuit 012 can be configured to drop the power signal at the second potential to a third potential and transmit the third potential to the control circuit 02.

Alternatively, the first potential may be 220V, the second potential may be 12V, and the third potential may be 3.3V.

Alternatively, taking the structure shown in fig. 4 as an example, the first step-down sub-circuit 011 shown in fig. 7 is electrically connected to the power source PW2 of the relay driving circuit 031 included in the relay circuit 03. Accordingly, the first voltage-reducing sub-circuit 011 reduces the power signal at the first potential provided by the power AC to the second potential, and transmits the reduced power signal to the relay driving circuit 031. And the first voltage reduction sub-circuit 011 is directly electrically connected with the power supply AC through the live wire L and the zero wire N. The second voltage dropping sub-circuit 012 can be electrically connected to the power source PW1 of the control sub-circuit 023 included in the control circuit 02. Accordingly, the second voltage-reducing sub-circuit 012 reduces the power signal at the second potential to the third potential, and then transmits the reduced power signal to the control sub-circuit 023. In addition, the zero crossing detection sub-circuit 022 is electrically connected to the fire line L indirectly through the first voltage dropping sub-circuit 011.

Optionally, referring to fig. 7, it can also be seen that the switch 00 may further include an overload protector disposed on the live line L. The overload protector can be used to overload switch 00.

Optionally, the embodiment of the present invention provides a control sub-circuit 023 may be a single chip microcomputer, and the control sub-circuit 023 may further include a series of peripheral devices. Such as the keys, communication modules, and indicator lights shown in fig. 7.

Optionally, fig. 8 is a schematic structural diagram of the first voltage-reducing sub-circuit 011 according to an embodiment of the present invention. As shown in fig. 8, the first buck sub-circuit 011 can include: a protection sub-circuit 0111, a half-wave rectifier sub-circuit 0112, a filter sub-circuit 0113 and a chopper buck sub-circuit 0114.

The protection sub-circuit 0111 may be electrically connected to the power source AC and the half-wave rectifier sub-circuit 0112, respectively. The protection sub-circuit 0111 may be configured to transmit a power signal at a first potential provided by a power AC to the half-wave rectifier sub-circuit 0112, and may be configured to perform over-current and over-voltage protection on the transmitted power signal.

The half-wave rectifier sub-circuit 0112 can also be electrically connected to the filter sub-circuit 0113. The half-wave rectifier sub-circuit 0112 may be configured to rectify the received power signal and transmit the rectified power signal to the filter sub-circuit 0113.

The filtering sub-circuit 0113 can also be electrically connected with the chopping voltage-reducing sub-circuit 0114. The filtering sub-circuit 0113 may be configured to filter the received power signal and transmit the filtered power signal to the chopper/buck sub-circuit 0114.

The chopping buck sub-circuit 0114 may also be electrically connected to the relay circuit 03 and the second buck sub-circuit 012, respectively. This step-down sub-circuit 0114 of chopping can be used to carry out the step-down back of chopping to the power signal that receives, transmits to relay circuit 03 and second step-down sub-circuit 012 respectively.

For example, taking the structure shown in fig. 7 as an example, the chopper bar sub-circuit 0114 is actually electrically connected to the power source terminal PW2 of the relay driving circuit 031 included in the relay circuit 03. Fig. 8 shows only the second potential 12V output by the chopper bar sub-circuit 0114.

As can be seen from the above description of the first buck sub-circuit 011, the first buck sub-circuit 011 can be a half-wave rectified non-isolated power supply. With reference to the structure shown in fig. 7, on the premise that the zero-cross detection sub-circuit 022 is electrically connected to the power AC indirectly through the first step-down sub-circuit 011, by setting the first step-down sub-circuit 011 as a half-wave rectified non-isolated power supply, compared to setting the first step-down sub-circuit 011 as a full-wave rectified non-isolated power supply, the reliable and stable zero-cross detection of the power signal by the zero-cross detection sub-circuit 022 to the control sub-circuit 023 can be ensured, and the reliable and stable zero-cross detection of the power signal by the control sub-circuit 023 can be ensured, that is, the reliable and stable detection of the zero-cross point of the power signal by the control sub-circuit 023 is ensured.

Optionally, fig. 9 is a schematic structural diagram of another first voltage-dropping sub-circuit 011 according to an embodiment of the present invention. As shown in fig. 9, the protection sub-circuit 0111 may include: a self-healing fuse P1 and a varistor R00. The self-healing fuse P1 may be referred to as a Polymeric Positive Temperature Coefficient (PPTC) element. The half-wave rectifier sub-circuit 0112 may include: the first diode D01. The filtering sub-circuit 0113 may include: a first capacitor C01, a second capacitor C02, and a first inductor L01 (i.e., the filter sub-circuit 0113 may be a pi-filter). Chopping buck subcircuit 0114 may include: the chopper chip U1, third electric capacity C03, fourth electric capacity C04, second inductance L02, first resistance R01, second resistance R02, third resistance R03, second diode D02 and third diode D03.

A first terminal of the self-healing fuse P1 may be electrically connected to the power source AC, a second terminal of the self-healing fuse P1 and a first terminal of the varistor R00 may be electrically connected to a first pole of the first diode D01, and a second terminal of the varistor R00 may be electrically connected to a pull-down power source terminal (e.g., the ground terminal GND shown in fig. 9).

The second diode of the first diode D01 and the first end of the first capacitor C01 may both be electrically connected to the first end of the first inductor L01.

The second end of the first inductor L01 and the first end of the second capacitor C02 may be both electrically connected to the chopper chip U1, and the second end of the first capacitor C01 and the second end of the second capacitor C02 may be both electrically connected to the pull-down power supply terminal GND.

The first end of the first resistor R01 and the first end of the second resistor R02 may both be electrically connected to the chopper chip U1. The second end of the first resistor R01 and the second end of the second resistor R02 may be electrically connected to the second poles of the chopper chip U1 and the second diode D02, respectively. The first end of the third capacitor C03 and the second end of the third diode D03 may both be electrically connected to the chopper chip U1. The first pole of the third diode D03, the first end of the second inductor L02, the first end of the third resistor R03, and the first end of the fourth capacitor C04 may be electrically connected to the relay circuit 03 and the second buck sub-circuit 012, respectively. Fig. 9 shows only the second potential 12V output from the first step-down sub-circuit 011.

The second terminal of the third capacitor C03 and the second terminal of the second inductor L02 may both be electrically connected to the second pole of the second diode D02. The first electrode of the second diode D02, the second end of the third resistor R03, and the second end of the fourth capacitor C04 may be electrically connected to the pull-down power source GND.

Optionally, fig. 10 is a schematic structural diagram of a second voltage dropping sub-circuit 012 according to an embodiment of the present invention. As shown in fig. 10, the second voltage dropping sub-circuit 012 may include: a fifth capacitor C05, a buck chip U2, a sixth capacitor C06 and a seventh capacitor C07.

The first terminal of the fifth capacitor C05 and the input terminal IN0 of the buck chip U2 may be electrically connected to the first buck sub-circuit 011. For example, fig. 10 does not show the first step-down sub-circuit 011, but only shows the second potential 12V output by the first step-down sub-circuit 011.

The first terminal of the sixth capacitor C06, the first terminal of the seventh capacitor C07, and the output terminal OUT0 of the buck chip U2 may all be electrically connected to the control circuit 02. For example, fig. 10 does not show the control circuit 02, but only shows the third potential 3.3V output by the first voltage-dropping sub-circuit 012.

The second terminal of the fifth capacitor C05, the second terminal of the sixth capacitor C06, the second terminal of the seventh capacitor C07, and the ground terminal V1 of the buck chip U2 may all be electrically connected to a pull-down power source terminal (e.g., the ground terminal GND shown in fig. 10).

Optionally, fig. 11 is a schematic structural diagram of a relay circuit provided in an embodiment of the present invention. As shown in fig. 11, the relay circuit 03 may include: fuse F1, conductive coil L11, resistor R10, resistor R11, diode D10, transistor M11, first contact P11, and second contact P12. In addition, as can be seen from fig. 2, the resistor R10, the resistor R11, the transistor M11, and the diode D10 may be associated with the relay driving circuit 031, and the rest of the structure may be associated with the relay 032.

As can be seen from the structures shown in fig. 7 and 11, in the embodiment of the present invention, one contact P11 of the two contacts included in the relay 032 can be electrically connected to the live wire L as the internal ground GND, and the live wire L is further provided with a fuse F1 (i.e., the overload protector described in the above embodiment). Another contact P12 may be electrically connected to the output OUT2 of relay 032. A first end of the resistor R10 may be electrically connected to the control end ON1 of the relay driver 031. The second terminal of the resistor R10 and the first terminal of the resistor R11 may be both electrically connected to the base of the transistor M11. The second terminal of the resistor R11 and the second pole of the transistor M11 may both be connected to GND. A first pole of the transistor M11 and a first pole of the diode D10 may both be electrically connected to the first end of the coil L11. The second pole of the diode D10 and the second end of the coil L11 may both be electrically connected to the power source terminal PW2 of the relay driver 031. Based on the above embodiment and fig. 11, the power source terminal PW2 can be used to receive the 12V electrical signal transmitted by the power taking circuit 01.

As is apparent from the structure of the relay circuit 03 shown in fig. 11, when the control circuit 02 transmits a turn-ON signal to the control terminal ON1 thereof, the transistor M11 may be turned ON in response to the turn-ON signal, and the first pole and the second pole of the transistor M11 form a loop to supply power to the coil L11. Further, coil L11 may bring contact P11 into close contact P12. At this time, the power source AC can be reliably conducted to the load 10.

Optionally, the switch 00 described in the embodiment of the present invention may include a plurality of relay circuits 03, and each relay circuit 03 may be electrically connected to one load 10. As such, switch 00 can include a plurality of load detection subcircuits 021.

For example, taking 4

relay circuits

03 and 4 load detection sub-circuits 021 as examples, fig. 12 shows a schematic structure diagram of a relay circuit 03 included in another switch 00. Fig. 13 shows a schematic structure diagram of a load detection sub-circuit 021 included in the switch 00.

As can be seen with reference to fig. 12, 4 relay circuits 03 can share one live line L. In addition, different loads 10 are electrically connected to different relay circuits 03 for differentiation. Further, fig. 12 also schematically shows connection terminals OUT2_1 to OUT2_4 of 4 load detection sub-circuits 021 ON the relay circuit 03, control terminals ON1_1 to ON1_4 of the relay drive circuit 031 in 4 relay circuits 03, and power supply terminals PW2_1 to PW2_4 of the relay drive circuit 031 in 4 relay circuits 03. Referring to fig. 13, it can be seen that the other ends of the 4 load detection sub-circuits 021 can be electrically connected to the 4 first sampling terminals PWR _ D1 to PWR _ D4 of the control sub-circuit 023, respectively.

Alternatively, taking 4 relay circuits 03 and a load detection sub-circuit 021 as an example, fig. 14 shows a schematic structural diagram of a control sub-circuit 023. As shown in fig. 14, the control sub-circuit 023 may include a control chip J1B. The control chip J1B can be electrically connected to the 4 first sampling terminals PWR _ D1 to PWR _ D4 and the 1 second sampling terminal SYNC, and further electrically connected to the control terminals ON1_1 to ON1_4 of the relay driving circuit 031 of the 4 relay circuits 03, respectively. In addition, referring to fig. 14, the control chip J1B can also be electrically connected to the 3.3V power terminal, the 12V power terminal and the ground terminal GND. The above processing logic of the control sub-circuit 023 can be executed by the control chip J1B.

Alternatively, taking the structures shown in fig. 9, 10, 12, 13 and 14 as examples, fig. 15 shows a schematic diagram of the overall structure of a switch 00. As can be seen with reference to fig. 15, the zero crossing detection sub-circuit 022 may be electrically connected to the first terminal of the voltage dependent resistor R00 of the first voltage step-down sub-circuit 011.

Optionally, fig. 16 is a schematic structural diagram of an electrical apparatus provided in an embodiment of the present invention. As shown in fig. 16, the electric device includes a load 10, and a switch 00 as shown in the above-mentioned drawing.

The switch 00 is electrically connected to the load 10 and the power source AC, respectively. The switch 00 is used to control the on/off state between the load 10 and the power supply AC. When the switch 00 controls the load 10 and the power AC to be conducted, the load 10 can operate under the driving of the power signal provided by the power AC.

In the embodiments of the present invention, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The meaning of "at least one" means one or more than one. The meaning of "plurality" means two or more.

The above description is only an optional embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A switch (00), characterized in that the switch (00) comprises: a power taking circuit (01), a control circuit (02) and a relay circuit (03);

the power taking circuit (01) is electrically connected with a power supply (AC), the control circuit (02) and the relay circuit (03) respectively, and the power taking circuit (01) is used for reducing the potential of a power supply signal provided by the power supply (AC) and then transmitting the power supply signal to the control circuit (02) and the relay circuit (03) respectively;

the control circuit (02) is also electrically connected with the relay circuit (03) and the power supply (AC) respectively, and the control circuit (02) is used for transmitting a conducting signal to the relay circuit (03) when detecting that the potential output to the relay circuit (03) is greater than a potential threshold value and a power supply signal provided by the power supply (AC) to the relay circuit (03) crosses a zero point after receiving a starting instruction;

the relay circuit (03) is further electrically connected with the power source (AC) and a load (10), respectively, and the relay circuit (03) is used for responding to the conducting signal and conducting the power source (AC) and the load (10).

2. The switch (00) according to claim 1, characterized in that the control circuit (02) comprises: a load detection sub-circuit (021), a zero crossing detection sub-circuit (022) and a control sub-circuit (023);

the electricity taking circuit (01) is electrically connected with the control sub-circuit (023), and the electricity taking circuit (01) is used for reducing the potential of a power supply signal provided by the power supply (AC) and then transmitting the reduced potential to the control sub-circuit (023);

the load detection sub-circuit (021) is electrically connected with the relay circuit (03) and the control sub-circuit (023) respectively, and the load detection sub-circuit (021) is used for collecting the potential output by the relay circuit (03) and transmitting the potential output by the relay circuit (03) to the control sub-circuit (023);

the zero-crossing detection sub-circuit (022) is electrically connected with the power supply (AC) and the control sub-circuit (023) respectively, and the zero-crossing detection sub-circuit (022) is used for collecting a power supply signal provided by the power supply (AC) and transmitting the power supply signal to the control sub-circuit (023);

the control sub-circuit (023) is further electrically connected with the relay circuit (03), and the control sub-circuit (023) is used for transmitting the conducting signal to the relay circuit (03) when detecting that the potential output to the relay circuit (03) is greater than the potential threshold value and when a power supply signal provided by the power supply (AC) to the relay circuit (03) crosses a zero point after receiving the turn-on instruction.

3. The switch (00) according to claim 2, characterized in that the load detection sub-circuit (021) comprises: a rectifier diode (D1), a first voltage-dividing resistor (R1), a second voltage-dividing resistor (R2) and a first filter capacitor (C1);

a first pole of the rectifier diode (D1) is electrically connected with the relay circuit (03), and a second pole of the rectifier diode (D1) is electrically connected with a first end of the first voltage dividing resistor (R1);

the second end of the first voltage-dividing resistor (R1), the first end of the first filter capacitor (C1) and the first end of the second voltage-dividing resistor (R2) are all electrically connected with the control sub-circuit (023);

the second end of the first filter capacitor (C1) and the second end of the second divider resistor (R2) are both electrically connected with a pull-down power supply terminal (GND).

4. The switch (00) according to claim 2, characterized in that the zero crossing detection sub-circuit (022) comprises: a third voltage dividing resistor (R3), a fourth voltage dividing resistor (R4) and a second filter capacitor (C2);

a first terminal of the third voltage dividing resistor (R3) is electrically connected to the power supply (AC), and a second terminal of the third voltage dividing resistor (R3), a first terminal of the second filter capacitor (C2) and a first terminal of the fourth voltage dividing resistor (R4) are electrically connected to the control sub-circuit (023);

the second end of the second filter capacitor (C2) and the second end of the fourth voltage dividing resistor (R4) are both electrically connected to a pull-down power supply terminal (GND).

5. The switch (00) according to any one of claims 1 to 4, wherein the power supply circuit (01) is electrically connected to the power supply (AC) via a live line (L) and a neutral line (N), the live line (L) being an internal ground, the relay circuit (03) comprising a ground terminal (V0), the ground terminal (V0) being electrically connected to the live line (L).

6. The switch (00) according to any of claims 1 to 4, wherein the power supply circuit (01) comprises: a first voltage-dropping sub-circuit (011) and a second voltage-dropping sub-circuit (012);

the first voltage reduction sub-circuit (011) is electrically connected with the power supply (AC), the relay circuit (03) and the second voltage reduction sub-circuit (012) respectively, and the first voltage reduction sub-circuit (011) is used for reducing a power supply signal of a first potential provided by the power supply (AC) to a second potential and then transmitting the power supply signal to the relay circuit (03) and the second voltage reduction sub-circuit (012) respectively;

the second voltage reduction sub-circuit (012) is also electrically connected with the control circuit (02), and the second voltage reduction sub-circuit (012) is used for reducing the power signal of the second potential to the third potential and then transmitting the third potential to the control circuit (02).

7. The switch (00) of claim 6, wherein the first buck subcircuit (011) comprises: the circuit comprises a protection sub-circuit (0111), a half-wave rectifier sub-circuit (0112), a filtering sub-circuit (0113) and a chopping voltage reduction sub-circuit (0114);

the protection sub-circuit (0111) is electrically connected with the power supply (AC) and the half-wave rectifier sub-circuit (0112) respectively, and the protection sub-circuit (0111) is used for transmitting a power supply signal of a first potential provided by the power supply (AC) to the half-wave rectifier sub-circuit (0112) and is used for performing overcurrent and overvoltage protection on the transmitted power supply signal;

the half-wave rectifier sub-circuit (0112) is also electrically connected with the filter sub-circuit (0113), and the half-wave rectifier sub-circuit (0112) is used for rectifying the received power supply signal and then transmitting the rectified power supply signal to the filter sub-circuit (0113);

the filtering sub-circuit (0113) is also electrically connected with the chopping buck sub-circuit (0114), and the filtering sub-circuit (0113) is used for filtering the received power supply signal and transmitting the filtered power supply signal to the chopping buck sub-circuit (0114);

chopping voltage reduction sub-circuit (0114) still respectively with relay circuit (03) with second step down sub-circuit (012) electric connection, chopping voltage reduction sub-circuit (0114) are used for carrying out the chopping voltage reduction back to the power signal that receives, transmit respectively extremely relay circuit (03) with second step down sub-circuit (012).

8. The switch (00) of claim 7, wherein the protection subcircuit (0111) comprises: a self-healing fuse (P1) and a varistor (R00); the half-wave rectifier sub-circuit (0112) comprises: a first diode (D01); the filtering sub-circuit (0113) comprises: a first capacitance (C01), a second capacitance (C02), and a first inductance (L01); the chopper buck sub-circuit (0114) comprises: the chopper circuit comprises a chopper chip (U1), a third capacitor (C03), a fourth capacitor (C04), a second inductor (L02), a first resistor (R01), a second resistor (R02), a third resistor (R03), a second diode (D02) and a third diode (D03);

wherein a first terminal of the self-healing fuse (P1) is electrically connected to the power supply (AC), a second terminal of the self-healing fuse (P1) and a first terminal of the varistor (R00) are both electrically connected to a first pole of the first diode (D01), and a second terminal of the varistor (R00) is electrically connected to a pull-down power supply terminal (GND);

a second pole of the first diode (D01) and a first end of the first capacitor (C01) are both electrically connected with a first end of the first inductor (L01);

a second end of the first inductor (L01) and a first end of the second capacitor (C02) are both electrically connected with the chopping chip (U1), and a second end of the first capacitor (C01) and a second end of the second capacitor (C02) are both electrically connected with the pull-down power supply end (GND);

the first end of the first resistor (R01) and the first end of the second resistor (R02) are both electrically connected with the chopping chip (U1); a second end of the first resistor (R01) and a second end of the second resistor (R02) are electrically connected with a second pole of the chopping chip (U1) and a second pole of the second diode (D02), respectively; the first end of the third capacitor (C03) and the second end of the third diode (D03) are both electrically connected with the chopping chip (U1); a first pole of the third diode (D03), a first end of the second inductor (L02), a first end of the third resistor (R03) and a first end of the fourth capacitor (C04) are electrically connected to the relay circuit (03) and the second buck sub-circuit (012), respectively; a second terminal of the third capacitor (C03) and a second terminal of the second inductor (L02) are both electrically connected to a second pole of the second diode (D02); the first pole of the second diode (D02), the second end of the third resistor (R03) and the second end of the fourth capacitor (C04) are all electrically connected to the pull-down power supply terminal (GND).

9. The switch (00) of claim 6, wherein the second buck sub-circuit (012) comprises: a fifth capacitor (C05), a buck chip (U2), a sixth capacitor (C06) and a seventh capacitor (C07);

the first end of the fifth capacitor (C05) and the input end (IN0) of the buck chip (U2) are both electrically connected with the first buck sub-circuit (011);

the first end of the sixth capacitor (C06), the first end of the seventh capacitor (C07) and the output end (OUT0) of the buck chip (U2) are all electrically connected with the control circuit (02);

the second end of the fifth capacitor (C05), the second end of the sixth capacitor (C06), the second end of the seventh capacitor (C07) and the ground terminal (V1) of the buck chip (U2) are all electrically connected to a pull-down power supply terminal (GND).

10. An electrical device, characterized in that it comprises: a load (10), and a switch (00) according to any of claims 1 to 9;

the switch (00) is electrically connected with the load (10) and a power supply (AC) respectively, and the switch (00) is used for controlling the on-off state between the load (10) and the power supply (AC).