A solid-state power relay based on hybrid integrated circuits

Abstract

The invention provides a solid-state power relay based on a hybrid integrated circuit, which includes a boost circuit, a control circuit, a drive circuit, an optocoupler U1, a MOS transistor Q1, a buck circuit, a protection circuit, and an optocoupler U2. The input end of the control circuit is connected in parallel with the output end of the boost circuit and the output end of the optocoupler U1. The output end of the control circuit is connected in parallel with the input end of the protection circuit and the input end of the drive circuit. The output end of the drive circuit is connected to the gate of the MOS transistor Q1. The invention uses the method of boosting the voltage at the Vin terminal of the power supply to supply power to the control circuit and the drive circuit, and uses the method of bucking the voltage at the Vin terminal of the power supply to supply power to the protection circuit, so as to replace the power supply method of the isolation transformer and realize the on-off control function of the MOS transistor Q1. The boost circuit is used to detect the voltage value at the Vin terminal of the power supply to realize the overvoltage and undervoltage protection functions. Since the control signal requires a small current (≤5 mA), there is no need to install an isolation transformer, the circuit is simple, and the volume is small.

Description

Technical Field

[0001] The present invention relates to the field of solid-state power relays, and in particular to a solid-state power relay based on a hybrid integrated circuit. Background Art

[0002] In recent years, with the development of China's aerospace and aviation equipment towards the directions of intelligence, informatization, light weight, and long endurance. There are requirements for multi-electrified and fully-electrified power supply systems for aerospace and aviation equipment to meet the needs of equipment intelligence, light weight, etc.

[0003] The existing solid-state power relay uses an isolation transformer to form an isolated power supply to supply power to related circuits, as Figure 1 shown. The disadvantages are: the control signal requires a large current (usually 30 mA to 80 mA), the circuit is complex, and the isolation transformer is large in size. Due to the large size and other disadvantages of the existing solid-state power relay, it hinders the application of the solid-state power relay to the power supply systems of equipment in the marine and electronic fields. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a solid-state power relay based on a hybrid integrated circuit.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention proposes a solid-state power relay based on a hybrid integrated circuit, including a boost circuit, a control circuit, a drive circuit, optocoupler U1, MOS transistor Q1, a buck circuit, a protection circuit, and optocoupler U2; the input end of the control circuit is connected in parallel with the output end of the boost circuit and the output end of the optocoupler U1, the output end of the control circuit is connected in parallel with the input end of the protection circuit and the input end of the drive circuit, and the output end of the drive circuit is connected to the gate of the MOS transistor Q1.

[0007] The boost circuit supplies power to the control circuit and the drive circuit, and the optocoupler U1 transmits the input control signal to the control circuit, thereby controlling the turn-off of the MOS transistor Q1. When the input of the control signal is disconnected or the control signal is at a low level (0 V), the control signal is sent into the control circuit through the optocoupler U1. After being processed by the control circuit, the drive circuit turns off the output, so that the MOS transistor Q1 turns off.

[0008] When a voltage is applied to the power supply Vin terminal, the boost circuit raises the voltage of the power supply Vin terminal to supply power to the control circuit and the drive circuit.

[0009] The buck circuit steps down the voltage of the power supply Vin terminal to supply power to the protection circuit.

[0010] When the control signal is input and a high level (5V) is applied, the control signal is sent into the control circuit through the optocoupler U1. The control circuit processes the control signal, and the processed control signal is current-amplified by the drive circuit to drive the MOS transistor Q1 to turn on.

[0011] When the input of the control signal is disconnected or the control signal is at a low level (0V), the control signal is sent into the control circuit through the optocoupler U1. After the control circuit processes the control signal, the drive circuit shuts off the output, thereby causing the MOS transistor Q1 to turn off.

[0012] Further, the input end of the buck circuit and the input end of the optocoupler U2 are both connected in parallel with the protection circuit, and the buck circuit supplies power to the protection circuit.

[0013] The boost circuit and the buck circuit simultaneously detect the voltage at the power supply Vin terminal. When the voltage at the power supply Vin terminal is as high as the overvoltage value or as low as the undervoltage value, the boost circuit stops outputting, terminates the power supply to the control circuit and the drive circuit, and the MOS transistor Q1 turns off.

[0014] The buck circuit continues to supply power to the protection circuit and outputs the protection signal output by the protection circuit through the optocoupler U2 and feeds it back to the peripheral system.

[0015] Further, the solid-state power relay based on the hybrid integrated circuit further includes a sampling resistor. The source stage of the MOS transistor Q1 is connected in parallel with the input end of the sampling resistor and the input end of the protection circuit.

[0016] Further, the output end of the sampling resistor is connected in parallel with the input end of the protection circuit and the Vout terminal.

[0017] Further, the drain of the MOS transistor Q1 is connected to the power supply Vin terminal.

[0018] Further, the output end of the protection circuit is connected to the PGND terminal.

[0019] Further, the output end of the boost circuit is grounded.

[0020] Advantages of the present invention:

[0021] 1. The solid-state power relay based on hybrid integrated circuits includes a boost circuit, a control circuit, a drive circuit, optocoupler U1, MOS transistor Q1, a buck circuit, a protection circuit, and optocoupler U2. The input end of the control circuit is connected in parallel with the output end of the boost circuit and the output end of optocoupler U1. The output end of the control circuit is connected in parallel with the input end of the protection circuit and the input end of the drive circuit. The output end of the drive circuit is connected to the gate of MOS transistor Q1. In the present invention, the power supply for the control circuit and the drive circuit is obtained by boosting the voltage at the Vin terminal of the power supply, and the power supply for the protection circuit is obtained by stepping down the voltage at the Vin terminal of the power supply, so as to replace the power supply method using an isolation transformer and achieve the on / off control function of MOS transistor Q1. The boost circuit is used to detect the voltage value at the Vin terminal of the power supply to achieve overvoltage and undervoltage protection functions. Since the control signal requires a small current (≤5 mA), there is no need to install an isolation transformer, and the circuit is simple and small in size.

[0022] 2. The solid-state power relay based on hybrid integrated circuits adopts an optocoupler isolation method to replace the original transformer isolation method to achieve the transmission of the control signal and the turn-off of MOS transistor Q1. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the circuit topology diagram of the existing solid-state power relay;

[0024] Figure 2 is the circuit topology diagram of the solid-state power relay based on hybrid integrated circuits. DETAILED DESCRIPTION OF THE INVENTION

[0025] In order to more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0026] Please refer to Figure 2 , the present invention provides a solid-state power relay based on hybrid integrated circuits, which includes a boost circuit, a control circuit, a drive circuit, optocoupler U1, MOS transistor Q1, a buck circuit, a protection circuit, and optocoupler U2. The input end of the control circuit is connected in parallel with the output end of the boost circuit and the output end of optocoupler U1. The output end of the control circuit is connected in parallel with the input end of the protection circuit and the input end of the drive circuit. The output end of the drive circuit is connected to the gate of MOS transistor Q1.

[0027] The boost circuit supplies power to the control circuit and the drive circuit. The optocoupler U1 transmits the input control signal to the control circuit, thereby controlling the turn-off of the MOS transistor Q1. When the input of the control signal is disconnected or the control signal is at a low level (0V), the control signal is sent into the control circuit through the optocoupler U1. After being processed by the control circuit, the drive circuit shuts off the output, so that the MOS transistor Q1 is turned off.

[0028] In this embodiment, when the control signal is input and a high level (5V) is applied, the control signal is sent into the control circuit through the optocoupler U1. The control circuit processes the control signal, and the processed control signal is amplified in current through the drive circuit to drive the MOS transistor Q1 to turn on.

[0029] When the input of the control signal is disconnected or the control signal is at a low level (0V), the control signal is sent into the control circuit through the optocoupler U1. After being processed by the control circuit, the drive circuit shuts off the output, and further causes the MOS transistor Q1 to turn off.

[0030] In this embodiment, the solid-state power relay based on the hybrid integrated circuit adopts the optocoupler isolation method to replace the original transformer isolation method to realize the transmission of the control signal and the turn-off of the MOS transistor Q1.

[0031] Further, the input end of the buck circuit and the input end of the optocoupler U2 are both connected in parallel with the protection circuit, and the buck circuit supplies power to the protection circuit.

[0032] In this embodiment, after a voltage is applied to the power supply Vin terminal, the boost circuit raises the voltage of the power supply Vin terminal to Vin + 12V to supply power to the control circuit and the drive circuit. The buck circuit reduces the voltage of the power supply Vin terminal to 12V to supply power to the protection circuit.

[0033] Please refer to Figure 2 , the solid-state power relay based on the hybrid integrated circuit further includes a sampling resistor. The source stage of the MOS transistor Q1 is connected in parallel with the input end of the sampling resistor and the input end of the protection circuit; the drain of the MOS transistor Q1 is connected to the power supply Vin terminal. The output end of the sampling resistor is connected in parallel with the input end of the protection circuit and the Vout terminal.

[0034] Further, the output end of the protection circuit is connected to the PGND terminal. The output end of the boost circuit is grounded.

[0035] In this embodiment, the overvoltage protection function and undervoltage protection function of the solid-state power relay based on hybrid integrated circuit: The boost circuit and the buck circuit simultaneously detect the voltage at the power supply Vin terminal. When the voltage at the power supply Vin terminal is as high as the overvoltage value or as low as the undervoltage value, the boost circuit stops outputting, terminates the power supply to the control circuit and the drive circuit, and the MOS transistor Q1 is turned off. And the buck circuit continues to work to supply power to the protection circuit, and then outputs the protection signal output by the protection circuit through the optocoupler U2 and feeds it back to the peripheral system.

[0036] The overcurrent protection function, short-circuit protection function, and open-circuit protection function of the solid-state power relay based on hybrid integrated circuit: The protection circuit collects the voltage value across the sampling resistor. The protection circuit determines the protection type (overcurrent protection, short-circuit protection, open-circuit protection) according to the collected voltage value, and outputs a corresponding control signal to the control circuit to turn off the outputs of the control circuit and the drive circuit, thereby turning off the MOS transistor Q1. At the same time, the protection circuit outputs a protection signal to the optocoupler U2, and outputs and feeds back the protection signal to the peripheral system through the optocoupler U2.

[0037] The present invention is different from the existing solid-state power relays. The existing solid-state power relays use an isolation transformer to form an isolated power supply to supply power to relevant circuits, as Figure 1 shown. The advantages are: The working range of the power supply Vin terminal is wide. The disadvantages are: The current required for the control signal is large (usually 30 mA to 80 mA), the circuit is complex, and the volume of the isolation transformer is large.

[0038] The present invention uses the method of boosting the power supply Vin terminal to supply power to the control circuit and the drive circuit, and the method of bucking the power supply Vin terminal to supply power to the protection circuit to replace the isolation transformer power supply method, and realizes the on and off control functions of the MOS transistor Q1; uses the boost circuit to detect the voltage value of the power supply Vin terminal to realize the overvoltage and undervoltage protection functions; because the current required for the control signal is small (≤5 mA), there is no need to install an isolation transformer, the circuit is simple, and the volume is small.

[0039] The present invention is manufactured by using thick-film hybrid integrated circuit technology, and has the characteristics of simple circuit, small volume, fast switching speed, no arc, small electromagnetic interference, small bias current, high reliability, etc., and also has multiple protection functions such as overcurrent protection function, overvoltage protection function, short-circuit protection function, etc.

[0040] The solid-state power relay based on hybrid integrated circuit can meet the working conditions from -55°C to 125°C, and the solid-state power relay based on hybrid integrated circuit can be widely applied to the power supply systems of equipment in the fields of aerospace, aviation, ships, weapons, etc.

[0041] Of course, the present invention may have many other embodiments. Based on this embodiment, other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the present invention.

Claims

1. A solid-state power relay based on a hybrid integrated circuit, characterized in that, It includes a boost circuit, a control circuit, a drive circuit, an optocoupler U1, a MOS transistor Q1, a buck circuit, a protection circuit, and an optocoupler U2; The input end of the control circuit is connected in parallel with the output end of the boost circuit and the output end of the optocoupler U1. The output end of the control circuit is connected in parallel with the input end of the protection circuit and the input end of the drive circuit. The output end of the drive circuit is connected to the gate of the MOS transistor Q1; The boost circuit supplies power to the control circuit and the drive circuit. The optocoupler U1 transmits the input control signal to the control circuit, thereby controlling the turn-off of the MOS transistor Q1; The input end of the buck circuit and the input end of the optocoupler U2 are both connected in parallel with the protection circuit. The buck circuit supplies power to the protection circuit; The solid-state power relay based on the hybrid integrated circuit further includes a sampling resistor. The source of the MOS transistor Q1 is connected in parallel with the input end of the sampling resistor and the input end of the protection circuit; The output end of the protection circuit is connected to the PGND terminal; The output end of the boost circuit is grounded; 2. The solid-state power relay based on a hybrid integrated circuit according to claim 1, wherein The output end of the sampling resistor is connected in parallel with the input end of the protection circuit and the Vout terminal; 3. The solid-state power relay based on a hybrid integrated circuit according to claim 1, wherein The drain of the MOS transistor Q1 is connected to the power supply Vin terminal.

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