Dual channel optocoupler with integrated feedback and zero crossing function

Abstract

The application relates to a dual-channel optocoupler integrating feedback and zero-crossing functions, which comprises a package, connecting wires and isolation materials, and further comprises a power feedback channel 1 and a zero-crossing detection channel 2. The power feedback channel 1 comprises a first optocoupler for transmitting a voltage signal. The zero-crossing detection channel 2 comprises a second optocoupler and a high-voltage control IC, which is connected with an AC power grid and used for detecting a zero-crossing moment of the AC power grid and outputting a zero-crossing signal (ACzero). The first optocoupler and the second optocoupler are reversely arranged, multiplexing pins are simplified to simplify external connection, 30% of PCB area is saved, material cost is reduced, dynamic conduction control technology reduces AC zero-crossing detection power consumption by more than 80%, and the overall system power consumption is further reduced.

Description

Technical Field

[0001] This invention relates to the field of optocoupler technology for semiconductor devices, and more specifically to a dual-channel optocoupler structure that integrates feedback and zero-crossing functions. Background Technology

[0002] In existing technologies, the secondary-side feedback switching power supply and AC zero-crossing detection system require two independent optocouplers to transmit signals; see [link to relevant documentation]. Figure 1 The voltage regulation feedback circuit of the switching power supply divides the output voltage through resistors R3 and R4 and connects it to optocoupler U1. Optocoupler U1 feeds back the real-time changes in the output voltage to the primary-side switching power supply control IC. The switching power supply control IC adjusts the operating frequency or the duty cycle to stabilize the output voltage. In addition, the AC zero-crossing detection is directly connected to the input grid voltage and relies on a large-value resistor R1 connected to optocoupler U2. The emitter of the optocoupler is continuously conducting to detect the zero-crossing moment of the grid voltage. The resistor R1 is generally set to 220kΩ, and its static power consumption is P=U² / R≈0.22W, which cannot meet the new energy efficiency standards. Moreover, the discrete optocoupler occupies system PCB space, increasing cost and wiring complexity. Summary of the Invention

[0003] The purpose of this invention is to provide a dual-channel optocoupler device that integrates feedback and zero-crossing functions, thereby reducing system power consumption, saving system PCB area, and reducing cost and wiring complexity.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This application provides a dual-channel optocoupler device integrating feedback and zero-crossing functions, including a package, connecting wires, and isolation material, and also includes a power feedback channel 1 and a zero-crossing detection channel 2; The power feedback channel 1 includes a first optocoupler for transmitting voltage signals; The zero-crossing detection channel 2 includes a second optocoupler and a high-voltage control IC, which is connected to the AC power grid to detect the zero-crossing moment of the AC power grid and output a zero-crossing signal (ACzero). The first optocoupler and the second optocoupler are arranged in opposite symmetrical configurations.

[0005] Preferably, the power feedback channel 1 and the zero-crossing detection channel 2 are physically and electrically isolated by the insulating material, and the isolation voltage level is not less than 3000V.

[0006] Preferably, the first optocoupler includes an LED1 transmitter and a PT1 receiver; the second optocoupler includes an LED2 transmitter and a PT2 receiver, and the output terminal of the high-voltage control IC is electrically connected to the positive terminal of the LED2 transmitter via the connecting wire.

[0007] Preferably, the high-voltage control IC is triggered to conduct when the AC power grid crosses zero, and is turned off after the AC power grid voltage or conduction duration reaches a set threshold. The threshold for conduction duration is set to be less than 10% of the AC power grid cycle, and the withstand voltage capability of the high-voltage control IC is not less than 500V.

[0008] Preferably, the turn-off threshold of the AC grid voltage is 50~200V, and the turn-on duration threshold is 0.5~2ms.

[0009] Preferably, the package is an 8-pin package, optionally SOP8 or DIP8. The power feedback channel 1 and the zero-crossing detection channel 2 do not share pins. The positive and negative terminals of the LED1, the emitter and collector of the PT1 are each led out with 4 pins. The input terminal of the high-voltage control IC, the negative terminal of the LED2, and the emitter and collector of the PT2 are also each led out with 4 pins. The pin order is not limited.

[0010] Preferably, the package is a 6-pin package, optionally SOP6 or DIP6. The power feedback channel 1 and the zero-crossing detection channel 2 share two pins through the connecting wire. The positive terminal of the LED1, the collector of the PT1, the input terminal of the high-voltage control IC, and the collector of the PT2 each have four pins. The negative terminal of the LED1 and the emitter of the PT2 are connected through the connecting wire and one pin is led out as a reference ground pin. The emitter of the PT1 and the negative terminal of the LED1 are connected through the connecting wire and another pin is led out as a reference ground pin on the other side. The pin order is not limited.

[0011] Preferably, the package is a 6-pin package, optionally SOP6 or DIP6. The power feedback channel 1 and the zero-crossing detection channel 2 share two pins through the connecting wire. The negative terminal of the emitting diode LED1, the collector of the receiving diode PT1, the input terminal of the high-voltage control IC, and the emitter of the receiving diode PT2 each have four pins. The positive terminal of the emitting diode LED1 and the collector of the receiving diode PT2 are connected through the connecting wire and have one pin as a common source port pin. The emitter of the receiving diode PT1 and the negative terminal of the emitting diode LED1 are connected through the connecting wire and have another pin as a reference ground pin. The pin order is not limited.

[0012] Preferably, the dual-channel optocoupler with integrated feedback and zero-crossing functions is applied in home appliances, variable frequency air conditioners, smart meters, microwave ovens, and other home appliance or industrial control equipment systems.

[0013] The beneficial effects of this invention are as follows: The dual-channel optocoupler device with integrated feedback and zero-crossing functions provided in this invention employs a high-voltage control IC. Internally, it includes a power supply forming circuit to enable internal circuitry to operate. An optocoupler driving circuit turns on the optocoupler LED upon AC input, thereby obtaining an AC zero-crossing signal on the secondary receiver of the optocoupler. A timing or voltage detection circuit disconnects the drive to the internal LED emitter when the input voltage phase or voltage meets set requirements, allowing for the acquisition of an opposite level signal during the optocoupler receiver's off-state, thus identifying the zero-crossing signal. Its withstand voltage exceeds the highest input AC voltage condition of the operating environment; for example, in a typical 100-240Vac household power grid environment, the circuit's withstand voltage exceeds 500Vdc, ensuring it can withstand high voltage breakdown even at the highest input voltage point. The high-voltage control circuit and optocoupler are encapsulated within a single package. Furthermore, another optocoupler responsible for power feedback is also encapsulated, reducing device size and simplifying use.

[0014] By adopting the above technical solution, the high-voltage control IC for zero-crossing detection is integrated with a dual-channel optocoupler. External connections are simplified through pin multiplexing, saving 30% of PCB area and reducing material costs. At the same time, the high-voltage control circuit is integrated into the zero-crossing detection loop, and the dynamic conduction control technology reduces AC zero-crossing detection power consumption by more than 80%, further reducing the overall power consumption of the system. Attached image description: Figure 1 The existing feedback and zero-crossing detection discrete optocoupler system connection structure; Figure 2 : Internal structure of the 8-pin connector and its system application diagram of this invention; Figure 3 : Internal structure and system application diagram of the 6-pin connector of this invention; Figure 4 Another embodiment of the 6-pin internal structure and system of the present invention; Figure 5 : A connection diagram of an embodiment of the present invention in a switching power supply system. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit this application.

[0016] It should be noted that references to "an embodiment," "embodiment," "example embodiment," etc., in this specification refer to the described embodiment including specific features, structures, or characteristics; however, not every embodiment must include these specific features, structures, or characteristics. Furthermore, such expressions do not refer to the same embodiment. Moreover, when describing specific features, structures, or characteristics in conjunction with embodiments, whether or not explicitly described, it is indicated that incorporating such features, structures, or characteristics into other embodiments is within the knowledge of those skilled in the art.

[0017] Furthermore, certain terms are used in the specification and subsequent claims to refer to specific components or parts. Those skilled in the art will understand that manufacturers may use different names or terms to refer to the same component or part. This specification and subsequent claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout the specification and subsequent claims are open-ended and should be interpreted as "including but not limited to." Additionally, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections made through other means.

[0018] Specifically, this application provides a dual-channel optocoupler device integrating feedback and zero-crossing functions. By integrating the high-voltage control IC for zero-crossing detection with the dual-channel optocoupler into a single device, complete electrical isolation is achieved within a single package, and pin reuse simplifies external connections; it saves 30% of PCB area and reduces material costs, as detailed below: See Figure 2This is one embodiment of the present invention, an 8-pin device, optionally SOP8 or DIP8, with dual-channel optocouplers arranged in an anti-symmetrical manner. One channel of this dual-channel optocoupler is used for the voltage regulation feedback circuit of the switching power supply, with its transmitter located on the secondary side of the power supply and connected to the sampling feedback circuit, and its receiver located on the primary side of the power supply and connected to the feedback pin FB of the switching power supply control IC. The other channel is used for the AC zero-crossing detection circuit, with its transmitter located on the primary side. In the prior art, the positive terminal of the transmitter is usually connected to one end of the AC voltage via a current-limiting resistor, and the negative terminal of the transmitter is connected in series with a high-voltage diode and then connected to the other end of the AC voltage. The transmitter conducts during the positive half-cycle of the AC voltage and is cut off during the negative half-cycle. The receiver is located on the secondary side of the power supply and connected to control circuits such as the MCU to receive the AC zero-crossing signal. To accurately obtain the AC zero-crossing signal, the resistor connected in series with the transmitter is usually small, for example, at 220V. 220kΩ resistors are commonly used in AC power grid applications. Therefore, during normal system operation, the resistor power consumption can reach 110mW (with half-wave blocking diode) or 220mW (without blocking diode), which can easily cause the system to fail to meet the standby power consumption efficiency requirements of the whole machine.

[0019] This invention aims to provide a method using a high-voltage control circuit with a withstand voltage of not less than 500V. This circuit connects the optocoupler and resistor only near the zero-crossing point of the AC cycle and disconnects the resistor for most of the AC cycle. The high-voltage control circuit has a built-in conduction duration threshold or AC grid voltage turn-off threshold, and the conduction duration threshold is set to be less than 10% of the AC grid cycle. This significantly reduces power consumption while ensuring that the secondary side receives a zero-crossing edge pulse signal synchronized with the AC zero-crossing point. Therefore, by placing the high-voltage control circuit, i.e., the high-voltage control IC, at the transmitter of one of the dual-channel optocouplers, the conduction time of the optocoupler can be controlled, thereby meeting the low power consumption requirements of the system.

[0020] Specifically, the high-voltage control IC is connected to the AC side of the power grid via an external resistor. When the AC voltage transitions from the negative half-cycle to the positive half-cycle, the high-voltage control IC connects the resistor to the optocoupler's transmitter, causing the optocoupler to conduct, thus obtaining a pulse edge on the secondary side synchronized with the AC zero-crossing point. The high-voltage control IC internally times for 1ms (or selectable within 0.5~2ms as needed) or detects a voltage of approximately 100V (or selectable within 50~200V as needed), then disconnects the resistor from the transmitter, turning off the optocoupler, and obtaining a pulse rising edge on the secondary side. Typical external resistor values ​​are R_ext=180~240kΩ (220V mains application) and R_ext=90~120kΩ (110V mains application), connected in series between the high-voltage control IC input pin and the AC live wire L of the mains to limit current.

[0021] Furthermore, such as Figure 3 and Figure 4As shown, by adjusting the output circuit connection method, the number of output ports can be reduced to 3. The feedback transmitter and the zero-crossing receiver share the same power supply or the same grounding pin, thereby further reducing the number of pins of the dual-channel optocoupler to 6, which can reduce the package size by more than 25%. The optional SOP6 or DIP6 further reduces the packaging cost and board area.

[0022] like Figure 2 The diagram illustrates the connection relationships of 8-pin devices in a switching power supply system. Channel 1 is used for voltage regulation feedback in the switching power supply, and Channel 2 is used for AC zero-crossing detection. Channel 1 is optocoupler 1, whose emitter LED1 is connected to the secondary sampling feedback circuit of the switching power supply. Optional common-ground connection: the positive terminal of LED1 is connected to the sampling feedback circuit, and the negative terminal is connected to the secondary-side ground; or common-source connection: the positive terminal of LED1 is connected to the secondary power supply circuit of the switching power supply, and the negative terminal is connected to the sampling feedback circuit. The receiver of optocoupler 1 is connected to the feedback pin FB of the switching power supply control IC. Optionally, the collector C1 of receiver PT1 is connected to the feedback pin FB, and its emitter E1 is connected to the primary-side reference ground of the switching power supply. Channel 2 consists of optocoupler 2 and a high-voltage control IC. The input terminal HV2 of the high-voltage control IC is connected to the AC live wire L of the mains through an external system resistor R1. The output terminal of the high-voltage control IC is connected to the positive terminal of the LED2 emitter of optocoupler 2 inside the package. The reference ground of the high-voltage control IC and the negative terminal of the LED2 emitter are connected together internally and connected to the primary side reference ground of the switching power supply. In the system, it is connected to the emitter E1 of the receiver PT1 of channel 1 and the primary side ground GND of the switching power supply control IC. Then, it is connected to the neutral line N of the other end of the AC grid by using one of the grounding diodes of the rectifier bridge or by connecting an independent diode in series. The collector C2 of the receiver PT2 of optocoupler 2 is connected to the secondary side MCU. The optional common ground connection method is: the collector of PT2 is connected to the power supply terminal of the secondary side MCU through resistor R3, and the zero-crossing signal ACzero is output to the secondary side MCU at the same time, and the emitter of PT2 is connected to the secondary side ground; or the common source connection method is: the collector C2 of PT2 is connected to the power supply terminal of the MCU, the emitter E2 of PT2 is connected to the secondary side ground through resistor R3, and the zero-crossing signal ACzero is output to the MCU.

[0023] The working principle of the dual-channel optocoupler device integrating feedback and zero-crossing functions in the switching power supply system of this invention is as follows: Feedback loop of the switching power supply system: When the secondary voltage vout changes, the brightness of the LED1 transmitter in channel 1 changes, and the collector C1 of the PT1 receiver in channel 1 outputs a corresponding signal to the switching power supply control IC. The switching power supply control IC adjusts the operating frequency or the duty cycle to stabilize the output voltage vout. AC zero-crossing detection loop: When the AC voltage crosses zero, the high-voltage control IC in channel 2 turns on, the LED2 transmitter lights up, and the collector C2 of the PT2 receiver outputs a low-level signal to the MCU. After the AC mains voltage or the conduction duration reaches a set threshold, the high-voltage control IC turns off, the LED2 transmitter stops lighting up, the collector C2 of the PT2 receiver returns to a high level, and the system enters low-power mode.

[0024] Based on the connection relationships described above in the switching power supply system, set the pin order suitable for plug-in type 8-pin devices: Pin 1: Channel 1 (power feedback) receiver collector (PT1_C1); Pin 2: Channel 1 (power feedback) receiver emitter (PT1_E1); Pin 3: Channel 2 (for zero-crossing detection) emitter negative terminal (LED2-); Pin 4: Channel 2 (for zero-crossing detection) high voltage control IC input (HV2); Pin 5: Channel 2 (for zero-crossing detection) receiver collector (PT2_C2); Pin 6: Channel 2 (for zero-crossing detection) receiver emitter (PT2_E2); Pin 7: Channel 1 (for power feedback) emitter negative terminal (LED1-); Pin 8: Channel 1 (for power feedback) positive terminal of the emitter (LED1+).

[0025] Optional settings are available for the pin order of surface-mount 8-pin devices: Pin 1: Channel 2 (for zero-crossing detection) high voltage control IC input terminal (HV2); Pin 2: Channel 2 (for zero-crossing detection) emitter negative terminal (LED2-); Pin 3: Channel 1 (power feedback) receiver emitter (PT1_E1); Pin 4: Channel 1 (power feedback) receiver collector (PT1_C1); Pin 5: Channel 1 (for power feedback) emitter positive terminal (LED1+); Pin 6: Channel 1 (for power feedback) emitter negative terminal (LED1-); Pin 7: Channel 2 (for zero-crossing detection) receiver emitter (PT2_E2); Pin 8: Channel 2 (for zero-crossing detection) receiver collector (PT2_C2).

[0026] like Figure 3 and Figure 4 As shown, the connection relationship of the 6-pin device in the switching power supply system is specifically illustrated. Similar to the 8-pin device described above, channel 1 is used for voltage regulation feedback of the switching power supply, and channel 2 is used for AC zero-crossing detection. Figure 3 In this secondary common ground connection configuration, the emitter E1 of the receiver PT1 in channel 1, which is connected to the primary side of the switching power supply, and the negative terminal of the emitter LED2 in channel 2, are directly connected inside the package. Similarly, the negative terminal of the emitter LED1 in channel 1 and the emitter E2 of the receiver PT2 in channel 2, which are connected to the secondary side of the switching power supply, are directly connected inside the package. Figure 4 In this secondary common-source connection method, the emitter E1 of the receiver PT1 of channel 1, which is connected to the primary side of the switching power supply, and the negative terminal of the emitter LED2 of channel 2 are directly connected inside the package. The positive terminal of the emitter LED1 of channel 1, which is connected to the secondary side of the switching power supply, and the collector C2 of the receiver PT2 of channel 2 are directly connected inside the package. Therefore, by using a common ground or common source connection method for the two ends of channel 1 and channel 2 that are isolated from each other, two pins can be reduced, thereby reducing packaging costs and board area.

[0027] Configure the pin order for plug-in 6-pin devices: Pin 1: Channel 2 (for zero-crossing detection) high voltage control IC input terminal (HV2); Pin 2: The negative terminal of the transmitter (LED2-) of channel 2 (for zero-crossing detection) and the emitter (PT1_E1) of the receiver (for power feedback) of channel 1 serve as a common reference ground; Pin 3: Channel 1 (power feedback) receiver collector (PT1_C1); Pin 4: Channel 1 (for power feedback) emitter negative terminal (LED1-); Pin 5: The positive terminal of the transmitter (LED1+) of Channel 1 (for power feedback) and the collector of the receiver (PT2_C2) of Channel 2 (for zero-crossing detection) serve as a common power supply pin; Pin 6: Channel 2 (for zero-crossing detection) receiver emitter (PT2_E2).

[0028] Optionally, set the pin order suitable for surface mount 6-pin devices: Pin 1: Channel 2 (for zero-crossing detection) high voltage control IC input terminal (HV2); Pin 2: The negative terminal of the transmitter (LED2-) of channel 2 (for zero-crossing detection) and the emitter (PT1_E1) of the receiver (for power feedback) of channel 1 serve as a common reference ground; Pin 3: Channel 1 (power feedback) receiver collector (PT1_C1); Pin 4: Channel 1 (for power feedback) emitter forward converter (LED1+); Pin 5: The negative terminal of the transmitter (LED1-) of Channel 1 (for power feedback) and the emitter (PT2_E2) of the receiver (for zero-crossing detection) of Channel 2 serve as a common reference ground; Pin 6: Channel 2 (for zero-crossing detection) receiver collector (PT2_C2).

[0029] The SOP or DIP mentioned above refer to surface mount packaging and through-hole packaging, respectively, and do not specifically refer to any particular surface mount or through-hole packaging.

[0030] This invention designs a high-voltage control circuit that includes an internal power supply forming circuit for the operation of internal circuitry; an optocoupler driving circuit to turn on the optocoupler LED upon AC input, thereby obtaining an AC zero-crossing signal on the secondary side receiver of the optocoupler; and a timing or voltage detection circuit to disconnect the drive of the internal LED emitter when the input voltage phase or voltage meets set requirements, so as to obtain an opposite level signal during the optocoupler receiver's off period, thereby identifying the zero-crossing signal. Its withstand voltage exceeds the highest input AC voltage condition of the operating environment; for example, in a typical 100~240Vac household power grid environment, the circuit's withstand voltage exceeds 500Vdc, thus allowing the circuit to withstand high voltage breakdown at the highest input voltage point. The high-voltage control circuit and the optocoupler are then encapsulated in a single package. Simultaneously, another optocoupler responsible for power feedback is also encapsulated, thereby reducing the device size and simplifying use.

[0031] In summary, this invention provides a dual-channel optocoupler that integrates feedback and zero-crossing functions, achieving complete electrical isolation within a single package with an isolation voltage rating of no less than 3000V. Multiplexed pins simplify external connections, saving 30% of PCB area and reducing material costs. Furthermore, the integrated high-voltage control IC within the zero-crossing detection circuit and dynamic conduction control technology reduce AC zero-crossing detection power consumption by over 80%, overcoming the energy efficiency bottleneck of traditional solutions and further reducing overall system power consumption. This invention can be widely applied in home appliances, inverter air conditioners, smart meters, microwave ovens, and other home appliance or industrial control equipment systems.

[0032] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0033] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A dual-channel optocoupler device integrating feedback and zero-crossing functions, comprising a package, connecting wires, and insulating material, characterized in that: It also includes power feedback channel 1 and zero-crossing detection channel 2; The power feedback channel 1 includes a first optocoupler for transmitting voltage signals; The zero-crossing detection channel 2 includes a second optocoupler and a high-voltage control IC, which is connected to the AC power grid to detect the zero-crossing moment of the AC power grid and output a zero-crossing signal (ACzero). The first optocoupler and the second optocoupler are arranged in opposite symmetrical configurations.

2. The dual-channel optocoupler with integrated feedback and zero-crossing function according to claim 1, characterized in that: The power feedback channel 1 and the zero-crossing detection channel 2 are physically and electrically isolated by the isolation material, and the isolation voltage level is not less than 3000V.

3. The dual-channel optocoupler with integrated feedback and zero-crossing function according to claim 2, characterized in that: The first optocoupler includes an LED1 transmitter and a PT1 receiver; the second optocoupler includes an LED2 transmitter and a PT2 receiver, and the output terminal of the high-voltage control IC is electrically connected to the positive terminal of the LED2 transmitter via the connecting wire.

4. The dual-channel optocoupler with integrated feedback and zero-crossing function according to claim 3, characterized in that: The high-voltage control IC is triggered to conduct when the AC power grid crosses zero, and is turned off after the AC power grid voltage or conduction duration reaches a set threshold. The threshold for conduction duration is set to be less than 10% of the AC power grid cycle, and the withstand voltage capability of the high-voltage control IC is not less than 500V.

5. The dual-channel optocoupler with integrated feedback and zero-crossing function according to claim 4, characterized in that: The turn-off threshold of the AC grid voltage is 50~200V, and the turn-on duration threshold is 0.5~2ms.

6. The dual-channel optocoupler with integrated feedback and zero-crossing function according to claim 3, characterized in that: The package is an 8-pin package, optionally SOP8 or DIP8. The power feedback channel 1 and the zero-crossing detection channel 2 do not share pins. The positive and negative terminals of the LED1, the emitter and collector of the PT1 are each led out with 4 pins. The input terminal of the high-voltage control IC, the negative terminal of the LED2, and the emitter and collector of the PT2 are also each led out with 4 pins. The pin order is not limited.

7. The dual-channel optocoupler with integrated feedback and zero-crossing function according to claim 3, characterized in that: The package is a 6-pin package, optionally SOP6 or DIP6. The power feedback channel 1 and the zero-crossing detection channel 2 share two pins through the connecting wire. The positive terminal of the LED1, the collector of the PT1, the input terminal of the high-voltage control IC, and the collector of the PT2 each have four pins. The negative terminal of the LED1 and the emitter of the PT2 are connected through the connecting wire, and one pin is led out as a reference ground pin. The emitter of the PT1 and the negative terminal of the LED1 are connected through the connecting wire, and another pin is led out as a reference ground pin on the other side. The pin order is not limited.

8. The dual-channel optocoupler with integrated feedback and zero-crossing function according to claim 3, characterized in that: The package is a 6-pin package, optionally SOP6 or DIP6. The power feedback channel 1 and the zero-crossing detection channel 2 share two pins through the connecting wire. The negative terminal of the emitting diode LED1, the collector of the receiving diode PT1, the input terminal of the high-voltage control IC, and the emitter of the receiving diode PT2 each have four pins. The positive terminal of the emitting diode LED1 and the collector of the receiving diode PT2 are connected through the connecting wire and have one pin as a common source port pin. The emitter of the receiving diode PT1 and the negative terminal of the emitting diode LED1 are connected through the connecting wire and have another pin as a reference ground pin. The pin order is not limited.

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