CN206224281U - Exchange 24V switches have the SSR controllers of the type that is galvanically isolated - Google Patents

Abstract

The utility model relates to an SSR controller with an AC 24V switch having a current isolation type, comprising an oscillator, the output end of the oscillator is connected to the input end of a signal switcher; the enabling end EN of the signal switcher is connected to the D flip-flop The output terminal Q is connected, and the output terminals YO and Y1 of the signal switch are connected to the primary side of the first transformer; the secondary side of the first transformer is connected to the input terminal of the rectification voltage doubler circuit, and the rectification voltage doubler circuit is connected to the secondary side of the first transformer The high-frequency voltage signal on the secondary side is rectified and doubled to output a DC signal; the output end of the rectified voltage doubler circuit is connected to the input end of the driving circuit for controlling the first power MOS tube and the second power MOS tube; the first The power MOS tube, the second power MOS tube, the secondary side of the second transformer and the coil of the electromagnetic relay form a circuit, and the normally open contact control of the electromagnetic relay is arranged between the mains and the electric equipment. The utility model is used for safely, reliably and conveniently performing non-contact control on electromechanical equipment.

Description

AC 24V switch with galvanic isolation SSR controller

technical field

The utility model relates to an SSR controller with an AC 24V switch and a current isolation type.

Background technique

With the rapid development of microelectronic technology, electronic computer technology, modern communication technology, optoelectronic technology and space technology, new requirements are put forward for relay technology. The development of new technology and new technology will undoubtedly promote the development of relay technology. The rapid development of microelectronics technology and ultra-large-scale IC has also put forward new requirements for relays. The first is miniaturization and sheeting. For example, the military TO-5 (8.5×8.5×7.0mm) relay in IC package has high vibration resistance and can make the equipment more reliable; the second is combination and multi-function, which can be compatible with IC and built-in Amplifiers require the sensitivity to be increased to the microwatt level; the third is full solidification. Solid state relays have high sensitivity and can prevent electromagnetic interference and radio frequency interference. The popularity of computer technology has significantly increased the demand for relays for microcomputers, and relays with microprocessors will develop rapidly. In the early 1980s, the digital time relays produced in the United States could be controlled by instructions. The combination of relays and microprocessors can form a small and perfect control system. Industrial robots controlled by computers are currently growing at a rate of 3.5% per year. Now, the computer-controlled production system has been able to produce a variety of low-cost relays on a production line, and can automatically complete a variety of operations and testing. The development of communication technology has far-reaching significance to the development of relays. On the one hand, due to the rapid development of communication technology, the application of the whole relay has increased. On the other hand, since optical fiber will be the aorta of transmission in the future information society, new types of relays such as optical fiber relays and reed optical fiber switches will appear driven by optical fiber communication, optical sensing, optical computers, and optical information processing technologies. Electromagnetic relay (EMR) has a history of more than 150 years since the initial use of telephone relays. With the development of the electronics industry, especially the breakthrough of optical coupling technology in the early 1970s, the solid-state relay (SSR, also known as electronic relay) has sprung up. Compared with traditional relays, it has the advantages of long life, simple structure, light weight and reliable performance. Solid state relays have no mechanical switches and have important features such as high compatibility with microprocessors, high speed, shock resistance, vibration resistance, and low leakage current. At the same time, because this product has no mechanical contacts, it does not generate electromagnetic noise, so it does not need additional components such as resistors and capacitors to maintain silence. Traditional relays require these additional components, and as a result, traditional relays tend to be bulky, complex, and costly.

Traditional SSR solid-state relays are generally composed of discrete components, film fixed resistor networks and chips, and are assembled by a mixed process to realize electrical isolation and signal coupling between the control circuit (input circuit) and the load circuit (output circuit), and the load is realized by solid-state devices. On-off switching function, without any moving parts inside. Generally, the above-mentioned technologies are used to correspond to different application occasions. The technology development is relatively mature, and it has certain standards and versatility in the industry, but there are generally still the following shortcomings.

(1) The voltage drop of the tube after conduction is large, and the positive step-down voltage of the thyristor or dual-phase thyristor can reach 1~2V. The on-resistance of the general power FET is also larger than the contact resistance of the mechanical contact.

(2) After the semiconductor device is turned off, there may still be a leakage current of several microamperes to several milliamperes, so ideal electrical isolation cannot be achieved.

(3) Due to the large voltage drop of the tube, the power consumption and heat generation after conduction are also large. The volume of high-power solid-state relays is much larger than that of electromagnetic relays with the same capacity, and the cost is also high.

(4) The solid-state relay is highly sensitive to overload, and it must be protected against overload with a fast fuse or RC damping circuit. The load of the solid state relay is obviously related to the ambient temperature. As the temperature rises, the load capacity will drop rapidly.

Contents of the invention

In view of this, the purpose of this utility model is to provide an SSR controller with an AC 24V switch having a current isolation type, so as to perform non-contact control on electromechanical equipment safely, reliably and conveniently.

In order to achieve the above object, the utility model adopts the following technical solutions: an SSR controller with an AC 24V switch having a current isolation type, which is characterized in that it includes an oscillator, the output end of the oscillator and the input end of the signal switch connected to provide an oscillating signal; the enable terminal EN of the signal switch is connected to the output terminal Q of the D flip-flop, and the output terminals YO and Y1 of the signal switch are connected to the primary side of the first transformer. When the terminal EN inputs a low level, the signal switch is in a normal working state, and the output terminals YO and Y1 generate a high-frequency voltage signal. When the enable terminal EN inputs a high level, the signal switch is in an invalid state, and the output terminals YO and Y1 do not generate any signal; the secondary side of the first transformer is connected to the input terminal of the rectification voltage doubler circuit, and the rectification voltage doubler circuit rectifies and doubles the high-frequency voltage signal on the secondary side of the first transformer, and outputs a DC signal ; The output end of the rectification voltage doubler circuit is connected to the input end of the drive circuit for controlling the first power MOS tube and the second power MOS tube, the source of the first power MOS tube, the second power MOS tube The source is connected to the H0 output end of the trigger circuit, the grid of the first power MOS transistor and the grid of the second power MOS transistor are connected to the L0 output end of the trigger circuit; the drain of the first power MOS transistor is connected to the One end of the secondary side of the second transformer is connected, the other end of the secondary side of the second transformer is connected to one end of the coil of the electromagnetic relay, and the other end of the coil of the electromagnetic relay is connected to the drain of the second power MOS tube The normally closed contact of the electromagnetic relay is connected to one end of the primary side of the second transformer, the normally open contact of the electromagnetic relay is electrically connected to an input of the electrical equipment, and the other input of the electrical equipment terminal is connected to the other terminal of the primary side of the second transformer, and the primary side of the second transformer is also connected to the mains.

Further, it also includes a backup battery, the secondary side of the second transformer is connected to the rectification circuit, the rectification circuit is connected to the backup battery, and the backup battery is connected to the electrical equipment via an inverter circuit. Connect to power it.

Further, the first power MOS transistor and the second power MOS transistor adopt IPB100N10S3-05 power field effect transistors.

Further, the turns ratio of the first transformer is 1:3.

Compared with the prior art, the utility model has the following beneficial effects: it combines the traditional SSR, modern electronic technology and integrated circuit, and provides a safer, more reliable and more flexible non-contact control mode for the field of residential and commercial automation.

Description of drawings

Fig. 1 is a schematic diagram of the system structure of the utility model.

Fig. 2 is a schematic structural diagram of a rectification and voltage doubling circuit according to an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention.

detailed description

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

Please refer to Fig. 1, the present embodiment provides a kind of SSR controller with AC 24V switch having a galvanic isolation type, which is characterized in that it includes an oscillator, the output end of the oscillator is connected to the input end of the signal switch, and a An oscillating signal with a frequency of 300KHz and a duty cycle of 50%; the enable terminal EN of the signal switcher is connected to the output terminal Q of the D flip-flop, and the output terminals YO and Y1 of the signal switcher are connected to the first transformer On the primary side of T1, the signal switch is in the normal working state when the enable terminal EN inputs a low level, and the output terminals YO and Y1 generate a high-frequency voltage signal close to 3V, and the signal switch is in the state when the enable terminal EN inputs a high level. In an invalid state, the output terminals YO and Y1 do not generate any signal; the secondary side of the first transformer is connected to the input terminal of the rectification voltage doubler circuit, and the turns ratio of the first transformer is 1:3, so its secondary side generates High-frequency voltage of about 10V, the rectification and voltage doubling circuit rectifies and doubles the high-frequency voltage signal on the secondary side of the first transformer, and outputs a DC signal of 18V as the drive signal; the output of the rectification and voltage doubling circuit The terminal is connected to the input end of the drive circuit for controlling the first power MOS tube and the second power MOS tube, the source of the first power MOS tube, the source of the second power MOS tube and the first output of the drive circuit The gate of the first power MOS transistor and the gate of the second power MOS transistor are connected to the second output end of the drive circuit; the drain of the first power MOS transistor is connected to the secondary of the second transformer T2 The other end of the secondary side of the second transformer is connected to one end of the coil L1 of the electromagnetic relay, and the other end of the coil L1 of the electromagnetic relay is connected to the drain of the second power MOS tube. The normally closed contact of the electromagnetic relay is connected to one end of the primary side of the second transformer, the normally open contact of the electromagnetic relay is electrically connected to an input of the electric device, and the other input end of the electric device is connected to the second The other end of the primary side of the transformer is connected, and the primary side of the second transformer is also connected to the mains.

Please continue to refer to Fig. 1, it also includes a backup battery, the secondary side of the second transformer is connected to the rectifier circuit, the rectifier circuit is connected to the backup battery, and the backup battery is connected to the user via an inverter circuit Connect electrical equipment to provide power for it.

As shown in Figure 2, it is a schematic structural diagram of a rectifier voltage doubler circuit according to an embodiment of the present invention, wherein the secondary side of the first transformer T1 is connected to the T0 and T1 terminals of CON4, and through the double voltage circuit formed by IN4007, after passing through The output of a linear voltage regulator circuit composed of a pair of complementary transistors is connected to H1 and L1 through the 15v voltage regulator diode output terminals of IN4744A.

As shown in Figure 3, it is a schematic structural diagram of a driving circuit according to an embodiment of the present invention. When the driving circuit receives a signal, that is, H1 and L1 of the rectifying voltage doubler circuit in Figure 2 send a signal, the first power MOS tube and the second power MOS tube are triggered. The MOS tube enters the working state, that is, H0 in the figure will open the Gate terminals of M1 and M2, and the tubes will be closed, and the Drain of M1 and M2 will be connected to both ends of the AC. The positive half cycle will pass through M1, and the negative half cycle will pass through M2 to form a complete exchange cycle.

In this embodiment, the first power MOS tube and the second power MOS tube adopt IPB100N10S3-05 power field effect tube; VDS breakdown voltage is 100 V, internal resistance RDS(on), max 4.8mΩ, ID can reach 100A.

In order for those skilled in the art to better understand this solution, the following is a detailed introduction in conjunction with specific control methods, including the conduction mode and the cut-off mode:

The conduction mode includes the following steps:

Step A1: Input "1" at the RPE terminal of the D flip-flop, the Q terminal of the D flip-flop outputs a low level, and the signal switch works in a normal state;

Step A2: The oscillating signal generated by the oscillator with a frequency of 300KHz and a duty cycle of 50% passes through the signal switch smoothly, and a high-frequency voltage signal close to 3V is generated at the output terminals YO and Y1 of the signal switch;

Step A3: The 10V high-frequency voltage after the high-frequency voltage signal is transformed by the first transformer is rectified and voltage-doubled in the rectification and voltage doubling circuit to generate a 18V DC signal;

Step A4: Under the action of the DC signal, the driving signal controls the conduction of the first power MOS transistor and the second power MOS transistor to form a loop, the coil of the electromagnetic relay is energized, and the normally open contact at the input end of the electrical equipment is closed, as shown in the figure K1 in 1 is closed, and the mains supplies power to the electrical equipment;

The cut-off mode includes the following steps:

Step B1: Input "1" at the CLR terminal of the D flip-flop, the Q terminal of the D flip-flop outputs a high level, and the signal switch works in an invalid state;

Step B2: The oscillating signal generated by the oscillator cannot pass through the signal switcher;

Step B3: the first power MOS tube and the second power MOS tube are in the cut-off state, the coil of the electromagnetic relay is not powered, the normally open contact at the input end of the electrical device is disconnected, and K1 in Figure 1 is disconnected;

Step B4: The backup battery supplies power to the electrical equipment through the inverter circuit.

The above descriptions are only preferred embodiments of the present utility model, and all equivalent changes and modifications made according to the patent scope of the present utility model shall fall within the scope of the present utility model.

Claims (4)

1. An AC 24V switch has a galvanically isolated SSR controller, characterized in that: it comprises an oscillator, the output of the oscillator is connected to the input of the signal switcher, an oscillating signal is provided; the signal switch The enable terminal EN of the device is connected to the output terminal Q of the D flip-flop, the output terminals YO and Y1 of the signal switch are connected to the primary side of the first transformer, and the signal switch is in normal state when the enable terminal EN inputs a low level In the working state, the output terminals YO and Y1 generate a high-frequency voltage signal. When the enable terminal EN inputs a high level, the signal switch is in an invalid state, and the output terminals YO and Y1 do not generate any signal; the secondary side of the first transformer It is connected with the input end of the rectification voltage doubler circuit, and the rectifier voltage doubler circuit rectifies and doubles the high frequency voltage signal on the secondary side of the first transformer, and outputs a DC signal; the output end of the rectifier voltage doubler circuit is connected to the The input terminal of the drive circuit for controlling the first power MOS tube and the second power MOS tube is connected, the source of the first power MOS tube and the source of the second power MOS tube are connected to the H0 output terminal of the trigger circuit, The grid of the first power MOS transistor and the grid of the second power MOS transistor are connected to the L0 output terminal of the trigger circuit; the drain of the first power MOS transistor is connected to one end of the secondary side of the second transformer, The other end of the secondary side of the second transformer is connected to one end of the coil of the electromagnetic relay, the other end of the coil of the electromagnetic relay is connected to the drain of the second power MOS tube, and the normally closed contact of the electromagnetic relay It is connected to one end of the primary side of the second transformer, the normally open contact of the electromagnetic relay is electrically connected to an input of the electrical equipment, and the other input end of the electrical equipment is connected to the other end of the primary side of the second transformer. connected, the primary side of the second transformer is also connected to the mains. 2. The AC 24V switch according to claim 1 has a galvanically isolated SSR controller, characterized in that: it also includes a backup battery, the secondary side of the second transformer is connected with a rectifier circuit, and the rectifier circuit is connected with the rectifier circuit The backup battery is connected, and the backup battery is connected to the electrical equipment via an inverter circuit to provide power for it. 3. The AC 24V switch according to claim 1 has a galvanically isolated SSR controller, wherein the first power MOS transistor and the second power MOS transistor are IPB100N10S3-05 power field effect transistors. 4. The AC 24V switch according to claim 1 has a galvanically isolated SSR controller, characterized in that: the turns ratio of the first transformer is 1:3.