CN219456409U

CN219456409U - AC/DC load switching module

Info

Publication number: CN219456409U
Application number: CN202320392778.6U
Authority: CN
Inventors: 杨斌; 陈朝晖
Original assignee: Defond Electech Co Ltd
Current assignee: Defond Electech Co Ltd
Priority date: 2023-03-06
Filing date: 2023-03-06
Publication date: 2023-08-01
Anticipated expiration: 2033-03-06

Abstract

The utility model provides an alternating current-direct current load switching module, which comprises an input power supply joint J1, an isolation power supply U1, an optocoupler chip U2, an MOS tube Q1, an MOS tube Q2 and an output power supply joint J2, wherein a pin1 pin on the input power supply joint J1 is connected with an input end IN+ pin on the isolation power supply U1, a pin2 pin and a pin3 pin on the input power supply joint J1 are respectively and electrically connected with one end of the optocoupler chip U2, an output end OUT+ of the isolation power supply U1 is electrically connected with the other end of the optocoupler chip U2, an S electrode of the MOS tube Q1 is connected with an S electrode of the MOS tube Q2 IN parallel, and a G electrode of the MOS tube Q1 is connected with a G electrode of the MOS tube Q2 IN parallel; the MOS tube is used as a switching device, the two MOS tubes Q1 and Q2 are connected in reverse series, and the characteristics of the MOS tubes are combined, so that the test sequence that the load is firstly switched on and then the tested product is switched on can be ensured.

Description

AC/DC load switching module

Technical Field

The utility model relates to the technical field of appliance switch detection, in particular to an alternating current-direct current load switching module.

Background

In the testing process of the appliance switch, the combination switching of the AC/DC load resistor, the inductor and the capacitor is needed, and the number of switching loops needed for testing is large. At present, a mechanical switch or an alternating current contactor is adopted for switching, and an SSR (Solid-state Relay) is used as a switching switch, wherein the SSR is conducted by a tested switch firstly and then by the tested switch because of the working principle, and the SSR does not meet the requirement of a test standard in practice. In addition, since the mechanical contact is used as a current path, the contact resistance is unstable with the increase of the use time and the increase of the number of actions. In addition, the mechanical switch has a relatively slow action speed (more than 10 ms), and has a certain limitation in part of test systems.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide an alternating current/direct current load switching module, which aims to solve the problem that a tested switch is firstly conducted and then is conducted when the tested switch is tested because the SSR is used as a switching switch in the testing process of the existing appliance switch.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the application provides an alternating current-direct current load switching module, alternating current-direct current load switching module includes input power connector J1, isolation power U1, opto-coupler chip U2, MOS pipe Q1, MOS pipe Q2 and output power connector J2, pin1 stitch on the input power connector J1 with the input IN+ foot on the isolation power U1 links to each other, pin2 stitch and pin3 stitch on the input power connector J1 respectively with opto-coupler chip U2 'S one end electrical property links to each other, isolation power U1' S output OUT+ with opto-coupler chip U2 'S the other end electrical property links to each other, MOS pipe Q1' S S utmost point with MOS pipe Q2 'S S utmost point is parallelly connected, MOS pipe Q1' S G utmost point with MOS pipe Q2 'S G utmost point is parallelly connected, MOS pipe Q1' S G utmost point and MOS pipe Q2 'S G utmost point simultaneously with opto-coupler chip U2' S the other end electrical property links to each other, MOS pipe Q1 'S D utmost point with output power connector J2 on the pin 2' S the output power connector J2.

Further, the ac/dc load switching module further includes a current limiting resistor R1, where the current limiting resistor R1 is installed in series between the pin3 pin of the input power connector J1 and the optocoupler chip U1.

Further, the ac/dc load switching module further includes a driving voltage dividing resistor R3, where the driving voltage dividing resistor R3 is connected in series between the G pole of the MOS transistor Q1 and the S pole of the MOS transistor Q2.

Further, the ac/dc load switching module further includes an indicator lamp D1, where the indicator lamp D1 is installed in series between the pin2 pin of the input power connector J1 and one end of the optocoupler chip U2, and is configured to display a level state of the pin2 pin of the input power connector J1.

Further, the ac/dc load switching module further includes a current limiting resistor R2, where the current limiting resistor R2 is installed in series between the other end of the optocoupler chip U2 and the G pole of the MOS transistor Q1.

The beneficial effects of the utility model are as follows: the MOS tube is used as a switching device, the two MOS tubes Q1 and Q2 are connected in reverse series, and the characteristics of the MOS tubes are combined, so that the test sequence that the load is firstly switched on and then the tested product is switched on can be ensured.

Drawings

Fig. 1 is a schematic circuit diagram of an ac/dc load switching module according to an embodiment of the present application.

Detailed Description

The utility model is described in further detail below with reference to the drawings and the detailed description.

Referring to fig. 1, the embodiment provides an ac/dc load switching module, which includes an input power connector J1, an isolation power U1, an optocoupler U2, a MOS transistor Q1, a MOS transistor Q2, and an output power connector J2.

The input power connector J1 comprises three pins, namely pin1, pin2 and pin3, wherein the pin1 is connected with a positive power supply to supply power (provide 12-36V voltage), and the pin2 is an input end.

Referring to fig. 1, pin1 of the input power connector J1 is electrically connected to an in+ pin of the input terminal of the isolated power supply U1, and pin2 of the input power connector J1 is connected to one end of the light emitting diode of the optocoupler chip U2.

When pin2-pin3 is at a voltage above +3V, the input is considered to be high level, and the output end is conducted; when the voltage of pin2-pin3 is lower than +2.5V, the voltage is considered to be low, and the output end is cut off.

In order to indicate the level state of pin2 pin of the input power connector J1, an indicator lamp D1 is mounted in series between pin2 pin of the input power connector J1 and one end of the optocoupler chip U2. The indicator lamp D1 is turned on when the level is high, and the indicator lamp D1 is turned off when the level is low.

With continued reference to fig. 1, the output terminal out+ of the isolation power supply U1 is electrically connected to the other end (signal amplifying end) of the optocoupler chip U2, and the output terminal OUT-of the isolation power supply U1 is electrically connected to the S-pole of the MOS transistor Q1 and the S-pole of the MOS transistor Q2. In this embodiment, the isolating power supply U1 is used for isolating the electrical circuit between the input power connector J1 and the MOS transistors Q1 and Q2, and providing the driving voltage for the MOS transistors Q1 and Q2.

With continued reference to fig. 1, in this embodiment, the MOS transistor Q1 and the MOS transistor Q2 are two MOSFET transistors connected in reverse series, the S poles between the MOS transistor Q1 and the MOS transistor Q2 are connected in parallel, and the G poles between the MOS transistor Q1 and the MOS transistor Q2 are also connected in parallel. The G pole of the MOS tube Q1 and the G pole of the MOS tube Q2 are simultaneously and electrically connected with the other end of the optocoupler chip U2, the D pole of the MOS tube Q1 is electrically connected with the pin1 pin on the output power connector J2, and the D pole of the MOS tube Q2 is electrically connected with the pin2 pin on the output power connector J2.

When the input end is at a high level, the voltage between the G pole and the S pole is more than 10V, and the D pole of the MOS tube Q1 is conducted with the D pole of the MOS tube Q2 to present low resistance; when the input terminal is at low level, the voltage between the G pole and the S pole is 0V, and at the moment, the MOS transistor Q1 and the MOS transistor Q2 are cut off and present a high-resistance state. Because the MOS tube Q1 and the MOS tube Q2 are in reverse series connection, the circuit is suitable for an alternating current-direct current circuit and used as a high-speed switching device.

In some embodiments, in order to obtain different input voltage ranges, a current limiting resistor R1 is further installed in series between the pin3 pin of the input power connector J1 and the optocoupler chip U1, and by adjusting the resistance value of the current resistor R1, the adjustment of the input voltage can be achieved.

Referring to fig. 1 again, in order to control the current of the G pole of the MOS transistor Q1 and the current of the G pole of the MOS transistor Q2, a current limiting resistor R2 is serially installed at the other end (signal amplifying end) of the optocoupler chip U2, and the current limiting resistor R2 is electrically connected to the G pole of the MOS transistor Q1 and the G pole of the MOS transistor Q2. In addition, the current limiting resistor R2 and the provided driving voltage dividing resistor R3 form a voltage dividing circuit, and a required driving voltage between the G pole and the S pole is provided for the MOS tube Q1 and the MOS tube Q2. The driving voltage dividing resistor R3 is connected in series between the G pole of the MOS tube Q1 and the S pole of the MOS tube Q2.

When the input end is at high level, the R3 and R2 form a voltage dividing circuit for providing driving voltage to drive the MOSFET (more than 10V), and when the input end is at low level, the R3 is used for discharging the G-S capacitance charges of the two MOSFETs, so that the MOS transistor Q1 and the MOS transistor Q2 are rapidly cut off.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. The alternating current-direct current load switching module is characterized by comprising an input power supply joint J1, an isolated power supply U1, an optocoupler chip U2, a MOS tube Q1, a MOS tube Q2 and an output power supply joint J2, wherein pin1 pins on the input power supply joint J1 are connected with an input end IN+ pin on the isolated power supply U1, pin2 pins and pin3 pins on the input power supply joint J1 are respectively and electrically connected with one end of the optocoupler chip U2, an output end OUT+ of the isolated power supply U1 is electrically connected with the other end of the optocoupler chip U2, an S electrode of the MOS tube Q1 is connected with an S electrode of the MOS tube Q2 IN parallel, G electrodes of the MOS tube Q1 and the G electrode of the MOS tube Q2 are simultaneously and electrically connected with the other end IN+ pin on the isolated power supply U1, D electrodes of the MOS tube Q1 are connected with the pin2 pins on the output power supply joint J2, and the pin2 pins on the MOS tube Q2 are electrically connected with each other.

2. An ac/dc load switching module according to claim 1, further comprising a current limiting resistor R1, wherein the current limiting resistor R1 is serially installed between pin3 of the input power connector J1 and the optocoupler chip U1.

3. An ac/dc load switching module according to claim 1 or 2, further comprising a driving voltage dividing resistor R3, wherein the driving voltage dividing resistor R3 is connected in series between the G pole of the MOS transistor Q1 and the S pole of the MOS transistor Q2.

4. The ac/dc load switching module according to claim 1, further comprising an indicator lamp D1, wherein the indicator lamp D1 is serially installed between the pin2 pin of the input power connector J1 and one end of the optocoupler U2, and is configured to display a level state of the pin2 pin of the input power connector J1.

5. An ac/dc load switching module according to claim 3, further comprising a current limiting resistor R2, wherein the current limiting resistor R2 is serially connected between the other end of the optocoupler U2 and the G pole of the MOS transistor Q1.