CN102436191B - A kind of control method of power control circuit - Google Patents

Abstract

The present invention relates to a kind of safety electricity-saving power control circuit and control method, L lines in household appliance power line and concatenation one on N line circuits are used for the switch element K1 for controlling L lines to simultaneously switch off or connect with N lines, a switch element K2 is concatenated on G line circuits in power line, control the switch element K1 and switch element K2 whether to turn on using the DC power-supply circuit in household electrical appliance, and then control the connecting and disconnecting of L lines, N lines and G lines in power line.The present invention does not have access to electricity when making the L lines of household appliance power line with G line line sequence reversal connections, effectively prevent the generation of peril, it is ensured that Electrical Safety.Meanwhile, when household electrical appliance do not work, three line conductors can be in time cut off, realize zero stand-by power consumption, it is to avoid mass energy is also saved while potential safety hazard.

Description

A control method for a power control circuit

technical field

The invention relates to a power supply circuit, in particular to a control method for a safe and energy-saving power supply control circuit, and belongs to the technical field of power supply control circuits.

Background technique

With the development of society, the number of household appliances is increasing. When the power plug of existing household appliances is inserted into a live socket, the electric control board will be charged; On electricity. Such long-term power-on not only affects the service life, but also wastes electric energy, and is also damaged by lightning strikes or overvoltage in the power line. With the increasing number of home appliances, the standby power consumed by existing home appliances when they are not working is staggering, resulting in a great waste of energy, and there are also potential safety hazards, which cannot really achieve the purpose of safety and energy saving of home appliances.

At the same time, if there is a reverse connection of the L line and the G line when the existing household appliances are in use: the G line is connected to the grounding place such as the casing, which should lead the leakage current back to the earth when the whole machine has an abnormal current. Avoid causing personal safety to the user; and when the L line and the G line are reversed, the housing is not connected to the earth, but the live wire, which is equivalent to the live wire directly connected to the shell of the home appliance. If the user touches the The shell will cause personal safety and there is a great potential safety hazard.

Contents of the invention

The main purpose of the present invention is to solve the above problems and deficiencies, and provide a safe and energy-saving power supply control circuit, which can avoid danger when the power line of the household appliance is reversed, and can realize the zero standby power consumption function of the household appliance.

Another main purpose of the present invention is to provide a control method of a power supply control circuit, which can avoid the danger when the power line of the household appliance is reversed, and at the same time can realize the function of zero standby power consumption of the household appliance.

For realizing the above object, technical scheme of the present invention is:

A safe and energy-saving power supply control circuit, a switch element K1 for controlling the simultaneous disconnection or connection of the L line and the N line is connected in series on the L line and the N line in the power line of the household appliance. A switching element K2 is connected in series on the G line, the switching element K1 is connected to a manual switch SW1 for manually controlling its conduction, and the switching element K1 and the switching element K2 are connected to a DC power supply circuit.

Further, the switch element K1 is a double pole single throw normally open relay, and the switch element K2 is a single pole single throw normally open relay.

Further, the control circuit is set inside the household appliance or on the plug of the power cord of the household appliance.

Another technical scheme of the present invention is:

A control method for a power supply control circuit. A switch element K1 for controlling the simultaneous disconnection or connection of the L line and the N line is connected in series on the L line and the N line in the power line of a household appliance. A switch element K2 is connected in series on the G line, and the DC power supply circuit in the household appliance is used to control the conduction of the switch element K1 and the switch element K2, and then control the connection of the L line, N line and G line in the power line. On and off.

Further, a manual switch SW1 is connected to the switching element K1, and the manual switch SW1 manually turns on the L line and the N line in the power line to supply power to the DC power supply circuit.

Further, when the household appliance enters the standby state, the DC power supply circuit cuts off the L line, N line and G line in the power line at the same time, specifically including the following steps: the DC power supply circuit controls the switching element K1 Disconnect, cutting off the L line and N line that supply power to the DC power supply circuit; the DC power supply circuit stops working, so that the switch element K2 is disconnected, and the G line is cut off.

Further, when the household appliance is working normally, the DC power supply circuit controls to connect the L line, N line and G line in the power line, which specifically includes the following steps: firstly control the switch element K1 to connect The L line and the N line in the power line supply power to the DC power supply circuit; the DC power supply circuit works normally, and the DC power supply circuit controls the conduction of the switching element K1 and the switching element K2, and then turns on the power supply The L line, N line and G line of the line

Further, the switch element K1 is a double pole single throw normally open relay, and the switch element K2 is a single pole single throw normally open relay.

To sum up, a safe and energy-saving power supply control circuit and control method according to the present invention, through a simple circuit structure, does not need to be powered on when the L line and the G line of the power line of the household appliance are connected in reverse order, effectively avoiding The occurrence of dangerous accidents ensures the safety of electricity use. At the same time, when the household appliances are not working, the three wires can be cut off in time to achieve zero standby power consumption, avoiding potential safety hazards and saving a lot of energy.

Description of drawings

Fig. 1 is the schematic diagram of the circuit of the present invention.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

As shown in FIG. 1 , a safe and energy-saving power supply control circuit adds a switch element K1 , a switch element K2 and a manual switch SW1 to the power supply circuit of a household appliance. Among them, the switch element K1 is connected in series with the L line and the N line in the power line, and is used to control the L line and the N line to be disconnected or connected at the same time, and the switch element K1 adopts a double-pole single-throw normally open relay. The switch element K2 is connected in series with the G line in the power line, and is used to control the connection or disconnection of the G line. The switch element K2 is a single-pole single-throw normally open relay. The manual switch SW1 is connected with the switch element K1 for manually controlling its closing.

Switching element K1 and switching element K2 are connected to the DC power supply circuit inside the household appliance, and the DC power supply circuit controls its conduction or not. The input end of the DC power supply circuit is connected to the L line and the N line. Only when the DC power supply circuit is working normally Only then can the switching element K1 and the switching element K2 be controlled to close, and then the L line, the N line and the G line are all turned on.

The above-mentioned safe and energy-saving power supply control circuit can be implemented inside the household appliance, and can also be implemented on the plug of the household appliance power cord.

The control method of the circuit is described in detail below:

When the L line and G line in the power line are connected correctly, manually press the manual switch SW1 to close the normally open switch element K1, turn on the L line and N line, and supply power to the DC power supply circuit at the same time, the drive circuit works, and the DC power supply The circuit controls the normally open switch element K1 and the normally open switch element K2 to be in the normally closed state, and the L line, N line and G line are all connected to supply power to the electric control board inside the household appliance. At this time, when the manual switch SW1 is released, the switching element K1 and the switching element K2 are still in the closed state, and the power supply can be normal.

When the home appliance finishes working and is in the standby state, the DC power supply circuit controls the switching element K1 to be disconnected, the L line and the N line supplying power to the DC power supply circuit are disconnected, the DC power supply circuit stops working, and the switching element K2 is also immediately disconnected. All disconnected for zero standby power consumption.

When the L line and the G line in the power line are reversely connected, after manually pressing the manual switch SW1 to close it, since the actual input power at this time is the G line and the N line, the DC power supply circuit cannot be powered, and the DC power supply circuit cannot Normal operation, so the DC power supply circuit cannot control the switching element K1 and the switching element K2 to be closed. When the hand that touches the button of the manual switch SW1 leaves, the contacts of the two switch elements K1 and switch element K2 corresponding to the manual switch SW1 bounce off automatically. At this time, the three wires are still disconnected and cannot supply power to the electric control board behind. , to avoid the occurrence of security risks.

As mentioned above, a similar technical solution can be derived in combination with the content of the solution given in the accompanying drawings. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are still within the scope of the technical solutions of the present invention.

Claims (4)

1. A control method of a power supply control circuit, characterized in that: a switching element K1 for controlling the L line and the N line to be disconnected or connected in series on the L line and the N line in the household appliance power line , a switch element K2 is connected in series on the G line in the power line, and the DC power supply circuit in the household appliance is used to control whether the switch element K1 and the switch element K2 are turned on or not, and then control the L line and N line in the power line. The connection and disconnection of line and G line; Wherein, when the household appliance enters the standby state, the DC power supply circuit controls and cuts off the L line, N line and G line in the power line, which specifically includes the following steps: The DC power supply circuit controls the switching element K1 to turn off, cutting off the L line and the N line supplying power to the DC power supply circuit; the DC power supply circuit stops working, turns off the switching element K2, and cuts off the G line. 2. The control method of the power supply control circuit according to claim 1, characterized in that: a manual switch SW1 is connected to the switch element K1, and the L line and the L line in the power line are manually turned on by the manual switch SW1 The N line supplies power to the DC power supply circuit. 3. The control method of the power supply control circuit according to claim 1, characterized in that: when the household appliance is in normal operation, the DC power supply circuit controls to connect the L line, the N line and the G line, specifically including the following steps: Firstly, control the switch element K1 to connect the L line and the N line in the power line to supply power to the DC power supply circuit; The DC power supply circuit works normally, and the switch element K1 and the switch element K2 are controlled by the DC power supply circuit to conduct, and then the L line, N line and G line of the power line are connected. 4. The control method of the power supply control circuit according to claim 1, characterized in that: the switching element K1 is a double pole single throw normally open relay, and the switching element K2 is a single pole single throw normally open relay.