CN204559097U - AC/DC universal device for under-voltage releasing equipment - Google Patents

Abstract

The utility model discloses an AC/DC universal undervoltage tripper with high safety and stability. It includes a switching power supply, a coil, and a rectifier module; it also includes: a sampling module and an on-off control module, the switching power supply provides a regulated power supply for the on-off control module and the coil, the sampling module includes an optocoupler, the The input terminal of the optocoupler is connected to the output terminal of the rectifier module, the on-off control module includes a MOS tube, the source and drain of the MOS tube are connected in series with the switching power supply and the coil, and the MOS tube is connected in series with the switching power supply and the coil. The gate of the tube is connected to the output terminal of the optocoupler. When the voltage value output by the sampling module is greater than the set voltage value, the MOS tube is turned on, and the switching power supply, the coil, and the MOS tube A series circuit is formed, and the coil is energized; when the voltage value output by the sampling module is lower than a set voltage value, the MOS transistor is turned off, and the coil is de-energized.

Description

AC and DC general undervoltage release

technical field

The utility model relates to an AC-DC universal undervoltage release.

Background technique

The undervoltage release is one of the important components of the circuit breaker. The undervoltage release is a release that makes the circuit breaker disconnect with or without delay when its terminal voltage drops to a certain range. When the power supply voltage drops, or even drops to the range of 70% to 35% of the rated working voltage, the undervoltage release should operate. When the power supply voltage is equal to 35% of the rated working voltage of the release, the undervoltage release The release should be able to prevent the circuit breaker from closing, the coil of the release is de-energized, the movable armature in the coil is released, and the circuit breaker is in the tripped state. The function of the undervoltage release is an effective measure to prevent the self-heating of the lower-level electrical equipment due to the large current in the undervoltage state. Therefore, the undervoltage release itself should have good safety and stability. At present, there are basically AC undervoltage releases on the market, and there are relatively few DC undervoltage releases, and the coil winding of AC undervoltage releases is difficult.

Contents of the invention

In view of the above problems, the purpose of this utility model is to provide a universal undervoltage release for AC and DC with high safety and stability.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

An AC/DC general-purpose undervoltage release, including a switching power supply, a coil, and a rectification module for converting it to DC when the external network is AC; it also includes: a sampling module for obtaining the output voltage of the rectification module, For the on-off control module that controls the power on and off of the coil, the switching power supply provides a stabilized power supply for the on-off control module and the coil, the sampling module includes an optocoupler, and the input of the optocoupler connected to the output terminal of the rectifier module, the on-off control module includes a MOS tube, the source and drain of the MOS tube are connected in series with the switching power supply and the coil, and the gate of the MOS tube Connected to the output terminal of the optocoupler, when the voltage value output by the sampling module is greater than the set voltage value, the MOS transistor is turned on, and the switching power supply, the coil, and the MOS transistor form a series circuit, The coil is energized; when the voltage value output by the sampling module is less than a set voltage value, the MOS transistor is turned off, and the coil is de-energized.

Preferably, the coil is connected in series between the anode of the switching power supply and the drain of the MOS transistor.

Preferably, the gate and source of the MOS transistor are connected in series with the optocoupler and the switching power supply.

Preferably, the undervoltage release includes a surge absorption and anti-interference module, the input end of the surge absorption and anti-interference module is connected to the external network and the output end is connected to the input end of the rectification module. The surge absorption and anti-interference module includes a piezoresistor and a first capacitor connected in parallel.

More preferably, the rectification module includes a bridge rectifier and a second capacitor connected in parallel, and the input end of the bridge rectifier is connected to the output end of the surge absorption and anti-interference module.

Preferably, the sampling module further includes a second resistor and a first resistor, and the optocoupler is connected in parallel with the second resistor and then connected in series with the first resistor and the rectifying module.

Preferably, the resistance value of the coil is 300-2000Ω.

Preferably, the rated voltage of the external network is AC voltage below 230V or DC voltage below 320V.

The utility model adopts the above structure, and has the following advantages compared with the prior art: by connecting the output terminal of the optocoupler with the grid of the MOS tube, and connecting the drain and source of the MOS tube with the switching power supply and the coil respectively, the optical The coupling controls the on-off of the MOS tube to control the energization and de-energization of the coil to realize the attraction and release of the armature, which greatly improves the safety and stability.

Description of drawings

Fig. 1 is a schematic diagram of the circuit principle of the undervoltage release of the present invention.

Detailed ways

The preferred embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art.

Fig. 1 shows a general AC and DC undervoltage release of the present invention. As shown in Figure 1, it includes a surge absorption and anti-interference module, a rectification module, a sampling module, an on-off control module, a switching power supply and a coil L. The AC-DC general-purpose undervoltage release is used in AC grids below 230V or DC grids below 320V.

The input end of the surge absorption and anti-interference module is connected to the external network and the output end is connected to the input end of the rectification module. The surge absorption and anti-interference module includes a varistor RV1 and a first capacitor C1 connected in parallel, and the varistor RV1 and the first capacitor C1 are respectively connected in parallel with the external network.

The rectifier module is used to convert the external network to direct current when the external network is alternating current. The rectification module includes a bridge rectifier BR1 and a second capacitor C2 connected in parallel, and the input end of the bridge rectifier BR1 is connected to the output end of the surge absorption and anti-interference module.

The sampling module is used to obtain the output voltage of the rectification module. The sampling module includes an optocoupler IC1, and the input end of the optocoupler IC1 is connected to the output end of the rectification module. Specifically, the sampling module further includes a first resistor R1 and a second resistor R2, the input terminal of the optocoupler IC1 is connected in parallel with the second resistor R2, and then connected in series with the first resistor R1 and the output terminal of the rectification module. By adjusting the resistance values of the first resistor R1 and the second resistor R2, the output voltage of the optocoupler IC1 can be adjusted, and then the tripping voltage of the undervoltage release can be adjusted.

The on-off control module is used to control the coil L to be energized and de-energized. The on-off control module includes a MOS transistor Q1. The gate and source of the MOS transistor Q1 are connected in series with the output terminal of the optocoupler IC1 and the switching power supply, the source and drain of the MOS transistor Q1 are connected in series with the coil L and the switching power supply, and the coil L is connected in series with the drain of the MOS transistor Q1 and the positive pole of the switching power supply. The switching power supply provides a regulated power supply for the coil L.

The resistance value of the coil L is 300~2000Ω. By adjusting the output voltage of the switching power supply, the voltage of the coil L can be adjusted to match the resistance of the coil to ensure a stable working voltage and a small fever.

When the voltage value output by the sampling module is greater than the set voltage value, the MOS tube Q1 is turned on, the switching power supply, the coil L, and the MOS tube Q1 form a series circuit, the coil L is energized, the armature matched with the coil L is attracted, and the circuit is broken The switch can be opened and closed normally. When the voltage value output by the sampling module is lower than the set voltage value, the MOS transistor Q1 is cut off, the coil L is de-energized, the armature is released, and the circuit breaker is in a tripped state.

By connecting the output terminal of the optocoupler IC1 to the gate of the MOS transistor Q1, and connecting the drain and source of the MOS transistor Q1 to the switching power supply and the coil L respectively, the optocoupler IC1 controls the on-off of the MOS transistor Q1 to control the coil The energization and de-energization of L realizes the attraction and release of the armature, the front and rear isolation of the circuit, and the safety and stability are greatly improved; the circuit output power of the undervoltage release is greater than 3W, and the coil winding is convenient and flexible.

The above-mentioned embodiment is only to illustrate the technical conception and characteristics of the present utility model. It is a preferred embodiment. Protection scope of utility model. All equivalent transformations or modifications made according to the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims (8)

1. A common undervoltage release for AC and DC, comprising a switching power supply, a coil, and a rectifying module for converting it to direct current when the external network is alternating current; it is characterized in that it also includes: for obtaining the output voltage of the rectifying module The sampling module, the on-off control module for controlling the coil to be energized and de-energized, the switching power supply provides a regulated power supply for the on-off control module and the coil, the sampling module includes an optocoupler, the The input end of the optocoupler is connected to the output end of the rectifier module, the on-off control module includes a MOS transistor, the source and drain of the MOS transistor are connected in series with the switching power supply and the coil, and the The gate of the MOS transistor is connected to the output terminal of the optocoupler. When the voltage value output by the sampling module is greater than the set voltage value, the MOS transistor is turned on, and the switching power supply, the coil, and the MOS The tubes form a series circuit, and the coil is energized; when the voltage value output by the sampling module is lower than the set voltage value, the MOS tube is cut off, and the coil is de-energized. 2. The undervoltage release according to claim 1, wherein the coil is connected in series between the positive pole of the switching power supply and the drain pole of the MOS transistor. 3. The undervoltage release according to claim 1, characterized in that: the gate and source of the MOS transistor are connected in series with the optocoupler and the switching power supply. 4. The undervoltage release according to claim 1, characterized in that: the undervoltage release includes a surge absorption and anti-interference module, and the input end of the surge absorption and anti-interference module is connected to the external network And the output end is connected to the input end of the rectification module, and the surge absorption and anti-interference module includes a piezoresistor and a first capacitor connected in parallel. 5. The undervoltage release according to claim 4, characterized in that: the rectification module includes a bridge rectifier and a second capacitor connected in parallel, the input end of the bridge rectifier is connected to the surge absorber and The output terminals of the anti-jamming module are connected. 6. The undervoltage release according to claim 1, wherein the sampling module further includes a second resistor and a first resistor, and the optocoupler is connected in parallel with the second resistor and then connected in series with the first resistor. A resistor and the rectification module. 7. The undervoltage release according to claim 1, characterized in that: the resistance value of the coil is 300~2000Ω. 8. The undervoltage release according to claim 1, characterized in that: the rated voltage of the external network is an AC voltage below 230V or a DC voltage below 320V.