CN207117155U - Standby power-off energy-saving device of large-current starting equipment - Google Patents

Abstract

The utility model relates to a standby power-off energy-saving device for high-current starting equipment, comprising: a magnetic trip switch connected to a power supply line of an electric device; and a standby power-off circuit for collecting the current of the power supply line, that is, when the equipment When in the standby state, the standby power-off circuit triggers the magnetic trip switch to be disconnected, so as to cut off the standby power supply of the high-current starting device. The standby power-off energy-saving device of the utility model can be widely used in high-power electrical equipment that does not involve a safety device and is started by a large current. When the equipment is in the standby state, the power supply of the equipment can be turned off with the minimum power consumption to save electric energy.

Description

A standby power-off energy-saving device for high-current starting equipment

technical field

The utility model relates to the control system field of automation technology, in particular to a standby power-off energy-saving device for large-current starting equipment.

Background technique

If the standby state of high-power electrical equipment does not involve safety, the equipment can be turned off to save power. At present, existing related products such as current relays use large current to close (circuit) and small current to normally open (open circuit). Electricity calculated on a monthly basis is not a small number. The utility model can realize the shutdown of the power supply of the equipment in standby with the minimum power consumption, and is not limited by the large current start-up.

Utility model content

The purpose of the utility model is to provide a standby power-off energy-saving device for high-current starting equipment, so as to cut off its power supply line when the high-current starting equipment is in standby.

In order to solve the above technical problems, the utility model provides a standby power-off energy-saving device for high-current starting equipment, including: a magnetic trip switch connected to the power supply line of the electrical equipment; and a standby power-off circuit for collecting power supply The current of the line, that is, when the device is in the standby state, the standby power-off circuit triggers the magnetic trip switch to be disconnected, so as to cut off the standby power supply of the high-current starting device.

Further, the standby power-off circuit includes: a transformer, the primary coil of the transformer is connected in series with the power supply line of the equipment, and its secondary coil is sequentially connected to a rectifier circuit, a filter circuit, a voltage stabilizing circuit and a magnetic release drive circuit; wherein the voltage stabilizing The positive and negative output terminals of the circuit are respectively connected to the positive and negative electrodes of the electrolytic capacitor C2; the positive output terminal of the voltage stabilizing circuit is connected to the base of a PNP transistor BG3, and the emitter of the PNP transistor BG3 is connected to the electrolytic capacitor C3, and the The base and the emitter of the PNP transistor BG3 are respectively connected to the anode and the cathode of the diode D2; and the collector of the PNP transistor BG3 is connected to the input end of the bidirectional thyristor driver in the magnetic release drive circuit through a resistor R5; when the device When starting to work normally, the voltage stabilizing circuit charges the electrolytic capacitor C2 and the electrolytic capacitor C3, so that the PNP transistor BG3 is cut off; when the device is in the standby state, the input current of the transformer drops, and the discharge of the electrolytic capacitor C2 makes the base potential of the PNP transistor BG3 drop , and the electrolytic capacitor C3 maintains the original state; when the base potential is lower than the emitter potential of the PNP transistor BG3, the PNP transistor BG3 is turned on, and the electrolytic capacitor C3 is discharged to trigger the conduction of the triac driver, so that the magnetic trip switch disconnect.

Further, the voltage stabilizing circuit adopts a series voltage stabilizing circuit, comprising: an adjustment tube, a sampling circuit formed by series connection of resistor R3 and resistor R4, and an NPN triode as a comparison circuit; the base of the NPN triode is connected to the sampling circuit, and its emitter The pole is connected to a diode, and the conduction voltage of the diode is used as the reference voltage of the comparison circuit; the collector of the NPN transistor is connected to the base of the adjustment tube; and when the device is in a standby state, the discharge of the electrolytic capacitor C2 is formed by the sampling circuit circuit.

Further, the drive circuit of the magnetic release includes: a bidirectional thyristor MC, which is connected in series to the coil power supply line of the magnetic trip switch; and the gate of the bidirectional thyristor MC is controlled by a bidirectional thyristor driver; When the equipment is in the standby state, the bidirectional thyristor driver controls the bidirectional thyristor MC to disconnect the coil power supply line, and the magnetic trip switch is de-energized and disconnected to cut off the standby power supply for starting the equipment with high current.

The beneficial effect of the utility model is that the utility model collects the current of the equipment power supply line through the standby power-off circuit connected in series in the high-current startup equipment power supply line, and when the equipment is in the standby state, triggers the magnetic disconnection circuit connected to the equipment power supply line. The buckle switch is turned off to cut off the standby power supply of the high-current startup equipment; the standby power-off energy-saving device of the utility model can be widely used in high-power electrical equipment that does not involve a safety device for high-current startup. Minimum power consumption, realize standby power off of equipment, save power.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a schematic circuit diagram of the standby power-off energy-saving device of the present invention.

Detailed ways

Now in conjunction with accompanying drawing, the utility model is described in further detail. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the utility model, so they only show the configurations related to the utility model.

As shown in Figure 1, this embodiment provides a standby power-off energy-saving device for high-current starting equipment, including: a magnetic trip switch QL, connected to the power supply line of the electrical equipment; and a standby power-off circuit for collecting The current of the power supply line, that is, when the device is in the standby state, the standby power-off circuit triggers the magnetic trip switch QL to turn off, so as to cut off the standby power supply of the large-current startup device.

Optionally, the power supply line may adopt single-phase 220V power supply, or three-phase 380V power supply; this embodiment adopts single-phase 220V power supply.

The standby power-off circuit includes: a transformer B, the primary coil of the transformer B is connected in series with the power supply line of the equipment, and its secondary coil is sequentially connected to a rectifier circuit, a filter circuit, a voltage stabilizing circuit and a magnetic release drive circuit; wherein the voltage stabilizing The positive and negative output terminals of the circuit are respectively connected to the positive and negative electrodes of the electrolytic capacitor C2; the positive output terminal of the voltage stabilizing circuit is connected to the base of a PNP transistor BG3, and the emitter of the PNP transistor BG3 is connected to the electrolytic capacitor C3, and the The base and the emitter of the PNP transistor BG3 are respectively connected to the anode and the cathode of the diode D2; and the collector of the PNP transistor BG3 is connected to the input end of the bidirectional thyristor driver in the magnetic release drive circuit through a resistor R5; when the device When starting to work normally, the voltage stabilizing circuit charges the electrolytic capacitor C2 and the electrolytic capacitor C3, so that the PNP transistor BG3 is cut off; when the device is in the standby state, the current of the transformer B drops, and the discharge of the electrolytic capacitor C2 makes the base potential of the PNP transistor BG3 drop, And the electrolytic capacitor C3 maintains the original state; when the base potential is lower than the emitter potential of the PNP transistor BG3, the PNP transistor BG3 is turned on, and the electrolytic capacitor C3 is discharged to trigger the conduction of the bidirectional thyristor driver, so that the magnetic trip switch is turned off open.

Specifically, the rectification circuit adopts a bridge rectification circuit; the filter circuit is filtered by an electrolytic capacitor C1 to eliminate interference signals when the device is started.

The voltage stabilizing circuit adopts a series voltage stabilizing circuit, comprising: an adjustment tube, a sampling circuit formed by series connection of a resistor R3 and a resistor R4, and an NPN triode as a comparison circuit; the base of the NPN triode is connected to the sampling circuit, and its emitter is connected to A diode, the conduction voltage of the diode is used as the reference voltage of the comparison circuit; the collector of the NPN transistor is connected to the base of the adjustment tube; and when the device is in a standby state, the discharge circuit of the electrolytic capacitor C2 is formed by the sampling circuit.

The drive circuit of the magnetic release includes: a bidirectional thyristor MC, which is connected in series to the coil power supply line of the magnetic trip switch QL; and the gate of the bidirectional thyristor MC is controlled by a bidirectional thyristor driver MOC; When the device is in the standby state, the triac driver MOC controls the triac MC to disconnect the coil power supply line, and the magnetic trip switch QL is de-energized and disconnected to cut off the standby power supply of the large current startup device.

Optionally, the bidirectional thyristor driver is, for example but not limited to, a MOC3020 triac driver; the bidirectional thyristor MC is, for example, but not limited to a Hi-com bidirectional thyristor.

Specifically, close the magnetic trip switch (if the starting current of the electrical equipment is greater than the rated current, a large-capacity switch needs to be connected in parallel in the power supply line, first turn on the large-capacity switch, after the startup is completed, close the magnetic trip switch, and then Turn off the large-capacity switch), the equipment is powered on, and the transformer B starts to collect the working current of the equipment, and its output is rectified by the bridge rectifier circuit, filtered by the electrolytic capacitor C1, and then charged by the series voltage regulator circuit to the electrolytic capacitor C2 and the electrolytic capacitor C3. At this time, the base and emitter voltages of the PNP transistor BG3 rise synchronously, and the PNP transistor BG3 is not turned on; when the device enters the standby state, the output voltage and current of the transformer B decrease sharply, and the electrolytic capacitor C2 passes through the resistors R2, R3 and The resistor R4 discharges, and the discharge speed of the electrolytic capacitor C2 is not greater than its charging speed; when the voltage of the electrolytic capacitor C2 is lower than the voltage of the electrolytic capacitor C3 and reaches the conduction threshold of the PNP transistor BG3, the electrolytic capacitor C3 passes through the PNP transistor BG3 Trigger the conduction of the bidirectional thyristor driver MOC, thereby controlling the conduction of the bidirectional thyristor MC, so that the coil L of the magnetic trip switch is energized, the reset of the magnetic trip switch QL is triggered, and the power supply line of the device is cut off.

Inspired by the above ideal embodiment according to the utility model, through the above description content, relevant staff can completely make various changes and modifications within the scope of not deviating from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims.

Claims (4)

1. A standby power-off energy-saving device for high-current starting equipment, characterized in that it comprises: Magnetic trip switch, connected to the power supply line of the electrical equipment; and The standby power-off circuit is used to collect the current of the power supply line, that is, When the device is in the standby state, the standby power-off circuit triggers the magnetic trip switch to be disconnected, so as to cut off the standby power supply of the high-current starting device. 2. The standby power-off energy-saving device according to claim 1, characterized in that: The standby power-off circuit includes: Transformer, the primary coil of the transformer is connected to the power supply line of the equipment in series, and its secondary coil is connected to the rectifier circuit, filter circuit, voltage stabilizing circuit and magnetic release drive circuit in sequence; The positive and negative output terminals of the voltage stabilizing circuit are respectively connected to the positive and negative poles of the electrolytic capacitor C2; The positive output terminal of the voltage stabilizing circuit is connected to the base of a PNP transistor BG3, the emitter of the PNP transistor BG3 is connected to the electrolytic capacitor C3, and the base and emitter of the PNP transistor BG3 are respectively connected to the anode and cathode of the diode D2 ; and the collector of the PNP transistor BG3 is connected to the input end of the bidirectional thyristor driver in the magnetic release drive circuit through a resistor R5; When the equipment starts to work normally, the voltage stabilizing circuit charges the electrolytic capacitor C2 and the electrolytic capacitor C3, so that the PNP transistor BG3 is cut off; When the device is in the standby state, the input current of the transformer drops, and the discharge of the electrolytic capacitor C2 causes the base potential of the PNP transistor BG3 to drop, and the electrolytic capacitor C3 remains in the original state; when the base potential is lower than the emitter potential of the PNP transistor BG3, The PNP transistor BG3 is turned on, and is discharged through the electrolytic capacitor C3 to trigger the triac driver to turn on, so that the magnetic trip switch is turned off. 3. The standby power-off energy-saving device according to claim 2, characterized in that: The voltage stabilizing circuit adopts a series voltage stabilizing circuit, including: Adjusting tube, a sampling circuit composed of resistor R3 and resistor R4 connected in series, as an NPN triode of the comparison circuit; The base of the NPN transistor is connected to the sampling circuit, its emitter is connected to a diode, and the conduction voltage of the diode is used as the reference voltage of the comparison circuit; The collector of the NPN transistor is connected to the base of the adjustment transistor; and When the device is in the standby state, the discharge circuit of the electrolytic capacitor C2 is formed by the sampling circuit. 4. The standby power-off energy-saving device according to claim 3, characterized in that: The driving circuit of the magnetic release includes: a bidirectional thyristor MC, which is connected in series to the coil power supply line of the magnetic trip switch; and The gate of the bidirectional thyristor MC is controlled by a bidirectional thyristor driver; When the device is in the standby state, the bidirectional thyristor driver controls the triac MC to disconnect the coil power supply line, and the magnetic trip switch is powered off to cut off the standby power supply of the large current starting device.