Power photoelectric relay module and assembly thereof

Abstract

The utility model discloses a power photoelectric relay module and an assembly thereof, belongs to the technical field of electronics, and relates to a photoelectric relay. Wherein the power photoelectric relay module comprises a plurality of groups of photoelectric relay units which are connected in series, each photoelectric relay unit consists of a driving chip, two power MOS (Metal Oxide Semiconductor) tubes and a high-voltage insulation resistor, and each driving chip controls the on-off of the two power MOS tubes; a high-voltage insulation resistor is electrically connected between D-pole pins of the two power MOS tubes so as to realize voltage sharing between the two power MOS tubes; the power photoelectric relay assembly comprises a power supply, a control module and a power photoelectric relay module, and the control module generates a control signal according to a received optical fiber pulse signal, so as to achieve the synchronous connection and disconnection of a plurality of power MOS tubes in the power relay module. And then the on-off of a high-voltage load loop electrically connected with the power relay module is controlled. According to the scheme, the application of the photoelectric relay module in the high-voltage load field is realized through a mode of connecting multiple groups of photoelectric relay units in series.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and more specifically, to a power photoelectric relay assembly. Background Technology

[0002] Relays are commonly used in circuit control for fault protection and circuit isolation. For example, in photovoltaic solar power generation, relays can isolate the direct current output from solar panels from the alternating current of the power grid to prevent interference from the panels. However, traditional relays use mechanical contacts to switch circuits on and off. After prolonged use, these contacts are prone to wear, leading to increased contact resistance and decreased contact reliability. In severe cases, this can cause problems such as arcing. Furthermore, traditional relays are susceptible to electromagnetic interference. In complex electromagnetic environments such as grid connection or ultra-high voltage power transmission and distribution, traditional relays may malfunction or fail due to electromagnetic interference.

[0003] Optoelectronic relays achieve complete isolation between input and output circuits through optocoupler. This electrical isolation characteristic allows the optoelectronic relay to operate stably even in complex electromagnetic environments. Furthermore, the absence of mechanical contacts avoids problems such as contact wear and arcing. Patent TW1551045B discloses a typical optoelectronic relay package structure, comprising a light-emitting element, a photoelectric conversion chip, and two inverted metal-oxide-semiconductor (MOS) chips with their sources electrically connected. The light-emitting element receives the input signal and generates a light signal. The photoelectric conversion chip outputs a voltage control signal based on the received light signal, thereby controlling the on / off state of the two MOS chips. While this optoelectronic relay possesses many advantages, its load capacity is relatively low compared to traditional electromagnetic relays, generally limiting its application to low-voltage or low-current loads. Therefore, to enable the application of the advantageous optoelectronic relay in high-voltage loads exceeding 1kV, a power optoelectronic relay assembly needs to be specifically designed. Utility Model Content

[0004] This invention addresses the limitations of existing photoelectric relays in terms of low withstand voltage and limited load capacity by providing a power photoelectric relay module and a power photoelectric relay assembly incorporating it, enabling its application in the control of high-voltage load circuits such as photovoltaic grid-connected systems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] According to one aspect of this utility model, a power photoelectric relay module is provided. The power photoelectric relay module includes a driving terminal, N photoelectric relay units, and a high-voltage output terminal, where N is greater than or equal to 2. The driving terminal includes an LED anode input terminal and an LED cathode output terminal. Each photoelectric relay unit includes a driving chip, two power MOSFETs, and a high-voltage insulation resistor. The two power MOSFETs include a first power MOSFET and a second power MOSFET. The driving chip includes a power supply pin, two gate output pins, and a source output pin. The power supply pin includes a positive power supply pin and a negative power supply pin. Each power MOSFET includes a gate (G) pin, a source (S) pin, and a drain (D) pin. The driving chip includes a gate (G) pin, a source (S) pin, and a drain (D) pin. The two gate output pins of the chip are electrically connected to the gate (G) pins of the two power MOSFETs, respectively, and the source output pin of the driver chip is electrically connected to the source (S) pins of the two power MOSFETs. A high-voltage insulation resistor is connected in series between the drain (D) pins of the first and second power MOSFETs in the photoelectric relay unit. The power supply pins of the first to Nth photoelectric relay units are connected in series sequentially. The drain (D) pins of the first to Nth photoelectric relay units are connected in series sequentially. The high-voltage output terminal includes the drain pins of the first power MOSFET of the first photoelectric relay unit and the drain pins of the second power MOSFET of the Nth photoelectric relay unit. This utility model provides a power photoelectric relay module composed of multiple sets of photoelectric relay units connected in series, with a high-voltage insulation resistor connected in series between the two power MOSFETs in each photoelectric relay unit, solving the voltage equalization problem between the two power MOSFETs in a multi-set series structure. Compared to photoelectric relays shown in the prior art, the power photoelectric relay module of this solution has a higher withstand voltage and can be well applied in high-voltage load scenarios.

[0007] In this power photoelectric relay module, the positive power supply pin of the first photoelectric relay unit is electrically connected to the anode input terminal of the LED, the negative power supply pin of the first photoelectric relay unit is electrically connected to the positive power supply pin of the second photoelectric relay unit, and so on, connecting all photoelectric relay units in series. The negative power supply pin of the Nth photoelectric relay unit is electrically connected to the cathode output terminal of the LED and grounded. The drain pin (D) of the second power MOSFET of the first photoelectric relay unit is electrically connected to the drain pin of the first power MOSFET of the second photoelectric relay unit, and so on, connecting all photoelectric relay units in series until the drain pin of the second power MOSFET of the (N-1)th photoelectric relay unit is electrically connected to the drain pin of the first power MOSFET of the Nth photoelectric relay unit. This invention achieves synchronous control of multiple photoelectric relay units by connecting the power supply pins of the photoelectric relay units in series; and improves the load capacity of the power photoelectric relay module by connecting the drain pins of the photoelectric relay units in series through voltage division.

[0008] Furthermore, the power optoelectronic relay module also includes a current-limiting resistor, a transistor, and a discharge element; the drain (D) pin of the first power MOSFET in the first optoelectronic relay unit is electrically connected to one end of the current-limiting resistor; the high-voltage output terminal includes the other end of the current-limiting resistor and the drain (D) pin of the second power MOSFET in the Nth optoelectronic relay unit; the negative power supply pin of the Nth optoelectronic relay unit is electrically connected to the collector of the transistor, the base of the transistor is electrically connected to one end of the discharge element, the other end of the discharge element is electrically connected to the emitter of the transistor, and the emitter of the transistor is electrically connected to the LED cathode output terminal and grounded. The power optoelectronic relay module of this invention achieves leakage discharge at the turn-off time of the power MOSFET through the transistor and the discharge element, avoiding damage to the power device caused by the turn-off spike pulse.

[0009] In this power optoelectronic relay module, the high-voltage insulation resistor is used to equalize the voltage between the first and second power MOSFETs, and the resistance value of the high-voltage insulation resistor is 1~1.5 megohms; the resistance value of the current-limiting resistor is 40~80 ohms. The power optoelectronic relay module of this invention achieves voltage equalization between the two power MOSFETs and current limiting in the load circuit through the high-voltage insulation resistor and the current-limiting resistor. The resistance values ​​of the high-voltage insulation resistor and the current-limiting resistor are within the preferred implementation range of this solution.

[0010] The power optoelectronic relay module's driving chip includes at least a light-emitting element and a light-receiving device. The positive terminal of the light-emitting element is electrically connected to the positive power supply pin of the driving chip, and the negative terminal of the light-emitting element is electrically connected to the negative power supply pin of the driving chip. The light-receiving device includes a light-detecting element and a conversion circuit. The light-detecting element is electrically connected to the conversion circuit, and the conversion circuit is electrically connected to the gate output pin and the source output pin of the driving chip. The light-emitting element and the light-detecting element are arranged opposite to each other.

[0011] Furthermore, the number N of the photoelectric relay units in the power photoelectric relay module is 5 to 10.

[0012] According to another aspect of the present invention, a power photoelectric relay assembly is provided, the power photoelectric relay assembly including a power supply, a control module, and a power photoelectric relay module; the power supply provides the control module with the power required for its operation; the control module includes an input terminal, a controller, and an output terminal, the input terminal of the control module is used to receive externally transmitted fiber optic pulses, and the output terminal of the control module is electrically connected to the drive terminal of the power photoelectric relay module.

[0013] Furthermore, the control module of the power optoelectronic relay assembly also includes a converter; one end of the converter is connected to the input terminal of the control module, and the other end of the converter is connected to the controller; the converter is used to convert the received fiber optic pulse signal into an electrical pulse signal, and the controller generates the control signal according to the electrical pulse signal, thereby controlling the power optoelectronic relay module.

[0014] The power photoelectric relay module and its components described in this utility model have the following advantages: the power photoelectric relay has good electrical isolation characteristics and strong anti-interference ability, and does not have the problems of contact wear, oxidation, and arcing that exist in traditional mechanical relays; multiple photoelectric relay units are connected in series and cooperate with current-limiting resistors to form the power photoelectric relay module, which has higher withstand voltage and can be applied to high-voltage load scenarios including but not limited to photovoltaic grid connection; the number of photoelectric relay units can be adjusted within a certain range to adapt to the control of different voltage loads; the transistors and discharge elements in the power photoelectric relay module can effectively avoid damage to power devices caused by peak pulses at the turn-off moment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This diagram shows a circuit structure schematic of a power photoelectric relay assembly according to an exemplary embodiment of the present invention.

[0017] Figure 2 This diagram shows a circuit connection schematic of a power photoelectric relay module according to an exemplary embodiment of the present invention.

[0018] Reference numerals in the detailed embodiments:

[0019] 1. Negative power supply pin of the driver chip; 2. Positive power supply pin of the driver chip; 3. Floating pin of the driver chip; 4. Gate output pin of the driver chip; 5. Source output pin of the driver chip; 6. Gate output pin of the driver chip; 7. Power supply; 8. Control module; 9. Power photoelectric relay module; 90. Photoelectric relay unit; 901. Driver chip; 902. First power MOSFET; 903. Second power MOSFET; 904. High voltage insulation resistor; 90 (90a), First photoelectric relay unit; 90 (90b), Second photoelectric relay unit; 90 (90j), Tenth photoelectric relay unit; 91. Transistor; 92. Discharge element; 93. Current limiting resistor; 10. Driver terminal; 101. LED anode input terminal; 102. LED cathode output terminal; 11. High voltage output terminal; 111. High voltage output terminal; 112. High voltage output terminal; 12. AC power supply; 13. Load. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this invention.

[0021] According to a technical concept of this utility model, a power photoelectric relay module 9 is provided. For example... Figure 1 and Figure 2 As shown, the power photoelectric relay module 9 includes a drive end 10, N photoelectric relay units 90 and a high-voltage output end 11, where N is greater than or equal to 2; the drive end 10 includes an LED anode input end 101 and an LED cathode output end 102; the high-voltage output end 11 includes a high-voltage output terminal 111 and a high-voltage output terminal 112.

[0022] Taking the first photoelectric relay unit 90a as an example, as follows: Figure 2 As shown, the photoelectric relay unit 90 includes a driver chip 901, two power MOSFETs, and a high-voltage insulation resistor 904. The two power MOSFETs include a first power MOSFET 902 and a second power MOSFET 903. The driver chip 901 includes a power supply pin, two gate output pins 4 and 6, and a source output pin 5. The power supply pin includes a positive power supply pin 2 and a negative power supply pin 1. The power MOSFETs include a gate (G) pin, a source (S) pin, and a drain (D) pin. The two gate output pins 4 and 6 of the driver chip 901 are electrically connected to the gate (G) pins of the two power MOSFETs 902 and 903, respectively. The source output pin 5 is electrically connected to the source (S) pins of the two power MOSFETs 902 and 903; a high-voltage insulation resistor 904 is connected in series between the drain (D) pin of the first power MOSFET 902 and the drain (D) pin of the second power MOSFET 903 in the photoelectric relay unit 90; the power supply pins of the first to Nth photoelectric relay units 90 are connected in series in sequence; the drain (D) pins of the first to Nth photoelectric relay units 90 are connected in series in sequence; the high-voltage output terminal 11 includes the drain (D) pin of the first power MOSFET of the first photoelectric relay unit 90 and the drain (D) pin of the second power MOSFET of the Nth photoelectric relay unit 90.

[0023] The following will further explain the series connection method of the photoelectric relay unit described in this example with specific preferred embodiments.

[0024] Specifically, such as Figure 2As shown, the number N of the photoelectric relay unit 90 is 5 to 10. For example, we assume that N = 10, that is, there are 10 photoelectric relay units 90 in this example. The positive power supply pin 2 of the driver chip 901 of the first photoelectric relay unit 90a is electrically connected to VCC, and VCC is electrically connected to the LED anode input terminal 101. The negative power supply pin 1 of the driver chip 901 of the first photoelectric relay unit 90a is electrically connected to the positive power supply pin 2 of the driver chip 901 of the second photoelectric relay unit 90b, and so on, connecting all the photoelectric relay units in series. The negative power supply pin 1 of the driver chip 901 of the tenth photoelectric relay unit 90j is electrically connected to the LED cathode output terminal 102 and grounded. The drain pin of the second power MOSFET 903 of the first photoelectric relay unit 90a is electrically connected to the drain pin of the first power MOSFET 902 of the second photoelectric relay unit 90b, and so on, connecting all the photoelectric relay units in series until the drain pin of the second power MOSFET 903 of the ninth photoelectric relay unit 90i is electrically connected to the drain pin of the first power MOSFET 902 of the tenth photoelectric relay unit 90j. The range of N is 5 to 10, which is only the preferred implementation range in this example and is not a limitation on the protection scope of this utility model. The value of N can be adjusted appropriately according to the actual withstand voltage and current requirements of the load. If the load voltage and current requirements are larger, the value of N will be larger, and vice versa.

[0025] like Figure 2As shown, the power photoelectric relay module 9 further includes a current-limiting resistor 93, a transistor 91, and a discharge element 92; the drain pin of the first power MOSFET 902 of the first photoelectric relay unit 90a is electrically connected to one end of the current-limiting resistor 93; the high-voltage output terminal 11 includes the other end of the current-limiting resistor 93 and the drain pin of the second power MOSFET 903 of the tenth photoelectric relay unit 90j; the negative power supply pin 1 of the tenth photoelectric relay unit 90j is electrically connected to the collector of the transistor 91, the base of the transistor 91 is electrically connected to one end of the discharge element 92, the other end of the discharge element 92 is electrically connected to the emitter of the transistor 91, and the emitter of the transistor 91 is electrically connected to the LED cathode output terminal 102 and grounded; the transistor 91 and the discharge element 92 are used for leakage discharge when the power MOSFET is turned off. It is understood that the specific specifications of the transistor 91 and the discharge element 92 need to be determined by debugging based on the actual product. As long as they conform to the core technical principles of this utility model, any transistor 91 and discharge element 92 with any specifications, or any other electronic device that plays the same role, are all simple replacements that can be expected for this solution and should be covered within the scope of protection of this patent.

[0026] like Figure 2 As shown, the high-voltage insulation resistor 904 is used to equalize the voltage of the first power MOSFET 902 and the second power MOSFET 903; the current-limiting resistor 93 is used to limit the current in the high-voltage output circuit. For example, specifically, as a preferred embodiment, the resistance of the high-voltage insulation resistor 904 is 1~1.5 megohms; the resistance of the current-limiting resistor 93 is 40~80 ohms. Since the function of a resistor in a circuit is essentially based on its influence on current and voltage, as long as it conforms to the core technical principle of this utility model, even if the resistance value is not within the optimal range shown in this example, it can be considered a simple adjustment of the resistance value based on different current and voltage requirements in actual applications, and should be covered within the protection scope of this patent.

[0027] The driver chip 901 internally includes at least a light-emitting element and a light-receiving device (not shown in the figure); the positive terminal of the light-emitting element is electrically connected to the positive power supply pin 2 of the driver chip 901, and the negative terminal of the light-emitting element is electrically connected to the negative power supply pin 1 of the driver chip 901; the light-receiving device includes a light-detecting element and a conversion circuit, the light-detecting element is electrically connected to the conversion circuit, and the conversion circuit is electrically connected to the gate output pins 4 and 6 and the source output pin 5 of the driver chip 901; the light-emitting element and the light-detecting element are arranged opposite to each other.

[0028] According to a technical concept of this utility model, a power photoelectric relay assembly is provided. For example... Figure 1As shown, the power photoelectric relay assembly includes a power supply 7, a control module 8, and a power photoelectric relay module 9; the power supply 7 provides the control module 8 with the power required for its operation; the control module 8 includes an input terminal, a controller, and an output terminal, the input terminal of the control module is used to receive externally transmitted fiber optic pulses, and the output terminal of the control module is electrically connected to the drive terminal 10 of the power photoelectric relay module 9.

[0029] The control module 8 also includes a converter (not shown in the figure); one end of the converter is connected to the input terminal of the control module, and the other end of the converter is connected to the controller; the converter is used to convert the received fiber optic pulse signal into an electrical pulse signal, and the controller generates a control signal based on the electrical pulse signal, thereby controlling the power photoelectric relay module 9.

[0030] In this example, the control signal includes a turn-on control signal and a turn-off control signal; when the control module detects that the fiber optic pulse signal is a rising edge, it generates the turn-on control signal, which causes all photoelectric relay units of the power photoelectric relay module 9 to turn on synchronously, thereby turning on the load circuit electrically connected to the high voltage output terminal 11 of the power photoelectric relay module 9.

[0031] When the control module detects that the optical fiber pulse signal is a falling edge, it generates the shutdown control signal, which causes all photoelectric relay units of the power photoelectric relay module 9 to be shut down synchronously, thereby shutting down the load circuit electrically connected to the high voltage output terminal 11 of the power photoelectric relay module 9.

[0032] Specifically, the control signal is used to control the light-emitting element; when the light-emitting element receives the turn-on control signal, the light-emitting element emits a light signal, and the light receiving device outputs a voltage signal greater than the threshold voltage of the power MOSFET, causing the power MOSFET to turn on; when the light-emitting element receives the turn-off control signal, the light-emitting element does not emit a light signal, and the light receiving device no longer outputs the voltage signal or outputs a voltage signal less than the threshold voltage of the power MOSFET, causing the power MOSFET to turn off.

[0033] This utility model provides a power photoelectric relay module and its components, which adopts multiple sets of photoelectric relay units connected in series and combined with current-limiting resistors to achieve a higher withstand voltage capability than traditional photoelectric relays, making it applicable to high-voltage load scenarios including but not limited to photovoltaic grid connection; the transistors and discharge elements in the power photoelectric relay module can effectively avoid damage to power devices by peak pulses at the turn-off time, further ensuring the stability of the power photoelectric relay module.

[0034] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A power photoelectric relay module, characterized in that, It includes a driver end, N photoelectric relay units, and a high-voltage output end, where N is greater than or equal to 2; The driving end includes an LED anode input end and an LED cathode output end; The photoelectric relay unit includes a driver chip, two power MOSFETs and a high-voltage insulation resistor, wherein the two power MOSFETs include a first power MOSFET and a second power MOSFET. The driver chip includes a power supply pin, two gate output pins and one source output pin, and the power supply pin includes a positive power supply pin and a negative power supply pin. The power MOSFET includes a gate (G) pin, a source (S) pin, and a drain (D) pin. The two gate output pins of the driver chip are electrically connected to the gate (G) pins of the two power MOSFETs, respectively, and the source output pin of the driver chip is electrically connected to the source (S) pins of the two power MOSFETs. The high-voltage insulation resistor is connected in series between the drain pin of the first power MOS transistor and the drain pin of the second power MOS transistor in the photoelectric relay unit. The power supply pins of the first to the Nth photoelectric relay units are connected in series. The D-pins of the first to Nth photoelectric relay units are connected in series sequentially; The high-voltage output terminal includes the drain pin of the first power MOS transistor of the first photoelectric relay unit and the drain pin of the second power MOS transistor of the Nth photoelectric relay unit.

2. The power photoelectric relay module according to claim 1, characterized in that, The positive power supply pin of the first photoelectric relay unit is electrically connected to the anode input terminal of the LED, the negative power supply pin of the first photoelectric relay unit is electrically connected to the positive power supply pin of the second photoelectric relay unit, and so on, connecting all the photoelectric relay units in series. The negative power supply pin of the Nth photoelectric relay unit is electrically connected to the cathode output terminal of the LED and grounded. The drain pin of the second power MOSFET of the first photoelectric relay unit is electrically connected to the drain pin of the first power MOSFET of the second photoelectric relay unit, and so on, connecting all the photoelectric relay units in series until the drain pin of the second power MOSFET of the (N-1)th photoelectric relay unit is electrically connected to the drain pin of the first power MOSFET of the Nth photoelectric relay unit.

3. The power photoelectric relay module according to claim 2, characterized in that, It also includes current-limiting resistors, transistors, and discharge components; The drain pin of the first power MOS transistor in the first photoelectric relay unit is electrically connected to one end of the current limiting resistor. The high-voltage output terminal includes the other end of the current-limiting resistor and the drain pin of the second power MOS transistor of the Nth photoelectric relay unit; The negative power supply pin of the Nth photoelectric relay unit is electrically connected to the collector of the transistor, the base of the transistor is electrically connected to one end of the discharge element, the other end of the discharge element is electrically connected to the emitter of the transistor, and the emitter of the transistor is electrically connected to the output terminal of the LED cathode and grounded. The transistor and the discharge element are used for leakage discharge when the power MOSFET is turned off.

4. The power photoelectric relay module according to claim 3, characterized in that, The high-voltage insulation resistor is used to equalize the voltage of the first power MOSFET and the second power MOSFET, and the resistance of the high-voltage insulation resistor is 1~1.5 megohms; The resistance of the current-limiting resistor is 40~80 ohms.

5. The power photoelectric relay module according to claim 1, characterized in that, The driver chip includes at least a light-emitting element and a light-receiving device. The positive terminal of the light-emitting element is electrically connected to the positive power supply pin of the driving chip, and the negative terminal of the light-emitting element is electrically connected to the negative power supply pin of the driving chip. The optical receiving device includes an optical sensing element and a conversion circuit. The optical sensing element is electrically connected to the conversion circuit, and the conversion circuit is electrically connected to the gate output pin and the source output pin of the driving chip. The light-emitting element and the light-detecting element are arranged opposite to each other.

6. The power photoelectric relay module according to claim 5, characterized in that, The value of N is 5 to 10.

7. A power photoelectric relay assembly, characterized in that, Includes a power supply, a control module, and the power photoelectric relay module as described in any one of claims 1 to 6; The power supply provides the control module with the power required for its operation. The control module includes an input terminal, a controller, and an output terminal. The input terminal of the control module is used to receive externally transmitted fiber optic pulses, and the output terminal of the control module is electrically connected to the drive terminal of the power photoelectric relay module.

8. The power photoelectric relay assembly according to claim 7, characterized in that, The control module also includes a converter; One end of the converter is connected to the input terminal of the control module, and the other end of the converter is connected to the controller; The converter is used to convert the received optical fiber pulse signal into an electrical pulse signal, and the controller generates a control signal based on the electrical pulse signal to control the power photoelectric relay module.

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