System for enabling switchable power supply and data transmission

Abstract

The application relates to a system for realizing switchable power supply and data transmission, which comprises a USB interface circuit, a TYPE-C interface circuit, a parallel circuit, a power chip circuit, a USB switch circuit, an XOR gate circuit, a connector circuit and an indicator lamp circuit, the USB interface circuit and the TYPE-C interface circuit are two input and output ports, and are connected with the parallel circuit, the parallel circuit is connected with the power chip circuit, the USB interface circuit and the TYPE-C interface circuit are also connected with the USB switch circuit, and the XOR gate circuit is connected with the USB switch circuit. The system for realizing switchable power supply and data transmission adopting the application can enable users to select a more convenient way to supply power and transmit data for a communication module. Meanwhile, the USB and the TYPE-C can be inserted at the same time, so that the power supply current can be improved. The module of the application is small in size, simple in production process, low in cost, the PCB board is printed by adopting the surface mounting, the production process is simple, and the cost is low.

Description

Technical Field

[0001] This invention relates to the field of communication devices, and more particularly to the field of communication modules, specifically to a system for achieving switchable power supply and data transmission. Background Technology

[0002] With the rapid development of communication technology, the requirements for the performance and functionality of communication devices are becoming increasingly stringent. In traditional communication module applications, the module typically connects to a host computer via a single USB interface for data transmission, and an external power supply powers the module.

[0003] Most modules currently available on the market have only a single data interface and limited power supply current. Modules with switchable power supply and data transmission capabilities not only solve the problem of a single data interface, but also allow for an increase in power supply current.

[0004] With the development of the times, customers' demands for products are also increasing; how to achieve switchable power supply and data transmission is an urgent need for users. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a system that can switch power supply and data transmission, which is functionally diverse, simple in structure, and widely applicable.

[0006] To achieve the above objectives, the present invention provides a system for switchable power supply and data transmission as follows:

[0007] This system, which enables switchable power supply and data transmission, is characterized by comprising a USB interface circuit, a TYPE-C interface circuit, a parallel circuit, a power chip circuit, a USB switch circuit, an XOR gate circuit, a connector circuit, and an indicator light circuit. The USB interface circuit and the TYPE-C interface circuit are two input / output ports, both connected to the parallel circuit. The parallel circuit is connected to the power chip circuit. Both the USB interface circuit and the TYPE-C interface circuit are also connected to the USB switch circuit. The XOR gate circuit is connected to the USB switch circuit. The USB switch circuit is used to switch the interface to be communicated. The XOR gate circuit generates high and low levels as control signals for the USB switch. The power chip circuit is used to design the output voltage according to requirements and to increase the current. The connector circuit supplies power to the communication module for data transmission. The indicator light circuit controls signal indicator lights and operation indicator lights. The connector circuit is connected to the power chip circuit and the USB switch circuit. The indicator light circuit is connected to the parallel circuit and the connector.

[0008] Preferably, the USB interface circuit includes a first suppressor, a second suppressor, a first resistor, a second resistor, a first capacitor, a second capacitor, a first inductor, a second inductor, and a square USB interface. The first suppressor and the second suppressor are respectively pulled down to ground on the differential line. The first capacitor, the first resistor, and the first inductor are connected in parallel, with one end connected to the USB pin and the other end grounded. The second capacitor, the second resistor, and the second inductor are connected in parallel, with one end connected to the USB pin and the other end grounded. The first suppressor, the second suppressor, the first resistor, the second resistor, the first capacitor, the second capacitor, the first inductor, and the second inductor are all connected to the pins of the square USB interface.

[0009] Preferably, the TYPE-C interface circuit includes a third suppressor, a fourth suppressor, and a TYPE-C interface. The third suppressor and the fourth suppressor are respectively pulled down to ground on the differential line, and both the third suppressor and the fourth suppressor are connected to the pins of the TYPE-C interface.

[0010] Preferably, the USB switch circuit includes a fifth diode, a third capacitor, a fourth capacitor, and a USB switch chip. One end of the fifth diode is connected to a power supply, and the other end is connected to a pin of the USB switch chip. The third capacitor and the fourth capacitor are connected in parallel, with one end connected to the path from the fifth diode to the switch pin and the other end grounded.

[0011] Preferably, the parallel circuit includes a sixth diode and a seventh diode. One end of the sixth diode is connected to the USB interface circuit and the other end is connected to the power supply. One end of the seventh diode is connected to the TYPE-C interface circuit and the other end is connected to the power supply.

[0012] Preferably, the power chip circuit includes a third resistor, a fourth resistor, a fifth capacitor, a sixth capacitor, a third inductor, and a fourth power chip. One end of the third resistor is connected to the output voltage, and the other end is connected to the power chip pin. One end of the fourth resistor is connected to the third resistor, and the other end is grounded. One end of the fifth capacitor is connected to the power supply, and the other end is grounded. One end of the sixth capacitor is connected to the output voltage, and the other end is grounded. One end of the third inductor is connected to the pin of the fourth power chip, and the other end is connected to the output voltage.

[0013] Preferably, the XOR gate circuit includes a seventh capacitor, an eighth diode, and a fifth XOR gate chip. One end of the seventh capacitor is grounded and the other end is connected to a power supply. One end of the eighth diode is connected to a pin of the fifth XOR gate chip, and the other end is connected to a power supply.

[0014] Preferably, the connector circuit includes an eighth capacitor and a connector, wherein one end of the eighth capacitor is grounded, the other end is connected to the input voltage, and is also connected to the pins of the connector.

[0015] Preferably, the indicator light circuit includes a fifth resistor, a sixth resistor, a seventh resistor, a ninth lamp, and a tenth lamp. One end of the fifth resistor is connected to the power supply, and the other end is connected to the ninth lamp. One end of the sixth resistor is connected to the control signal, and the other end is connected to the tenth lamp. One end of the seventh resistor is connected to the power supply, and the other end is connected to the control signal. One end of the ninth lamp is connected to the fifth resistor, and the other end is grounded. One end of the tenth lamp is connected to the sixth resistor, and the other end is grounded.

[0016] The system employing this invention enables switchable power supply and data transmission, allowing users to choose the most convenient method for powering the communication module and transmitting data. Simultaneously, USB and Type-C can be inserted, increasing the power supply current. The module of this invention is small in size, simple in manufacturing process, and low in cost. Through a rational layout and routing conversion network, the size is significantly reduced. Furthermore, the board uses PCB layout with surface-mount components, simplifying the manufacturing process and reducing costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the circuit structure of the system for implementing switchable power supply and data transmission according to the present invention.

[0018] Figure 2 This is a schematic diagram of the USB switch circuit and XOR gate circuit of the system for implementing switchable power supply and data transmission according to the present invention.

[0019] Figure 3 This is a schematic diagram of the connector circuit and indicator light circuit of the system for implementing switchable power supply and data transmission according to the present invention.

[0020] Figure 4 This is a schematic diagram of the circuit structure of the USB interface circuit for implementing the system of switchable power supply and data transmission according to the present invention.

[0021] Figure 5 This is a schematic diagram of the circuit structure of the TYPE-C interface circuit for implementing the system of switchable power supply and data transmission according to the present invention.

[0022] Figure 6 This is a schematic diagram of the parallel circuit structure of the system for implementing switchable power supply and data transmission according to the present invention.

[0023] Figure 7 This is a schematic diagram of the USB switch circuit for implementing the system of switchable power supply and data transmission according to the present invention.

[0024] Figure 8 This is a schematic diagram of the circuit structure of the power chip circuit for implementing the system of switchable power supply and data transmission according to the present invention.

[0025] Figure 9 This is a schematic diagram of the XOR gate circuit for implementing the system of switchable power supply and data transmission according to the present invention.

[0026] Figure 10 This is a schematic diagram of the connector circuit for implementing the system of switchable power supply and data transmission according to the present invention.

[0027] Figure 11 This is a schematic diagram of the circuit structure of the indicator light circuit of the system for implementing switchable power supply and data transmission according to the present invention. Detailed Implementation

[0028] To more clearly describe the technical content of the present invention, the following description is provided in conjunction with specific embodiments.

[0029] The present invention provides a system for switching power supply and data transmission, comprising a USB interface circuit, a TYPE-C interface circuit, a parallel circuit, a power chip circuit, a USB switch circuit, an XOR gate circuit, a connector circuit, and an indicator light circuit. The USB interface circuit and the TYPE-C interface circuit are two input / output ports, both connected to the parallel circuit. The parallel circuit is connected to the power chip circuit. Both the USB interface circuit and the TYPE-C interface circuit are also connected to the USB switch circuit. The XOR gate circuit is connected to the USB switch circuit. The USB switch circuit is used to switch the interface to be communicated. The XOR gate circuit generates high and low levels as control signals for the USB switch. The power chip circuit is used to design the output voltage according to requirements and to increase the current. The connector circuit supplies power to the communication module for data transmission. The indicator light circuit controls the signal indicator light and the working indicator light. The connector circuit is connected to the power chip circuit and the USB switch circuit. The indicator light circuit is connected to the parallel circuit and the connector.

[0030] In a preferred embodiment of the present invention, the USB interface circuit includes a first suppressor D1, a second suppressor D2, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a first inductor L1, a second inductor L2, and a square USB interface U1. The first suppressor D1 and the second suppressor D2 are respectively pulled down to ground on the differential line. The first capacitor C1, the first resistor R1, and the first inductor L1 are connected in parallel, with one end connected to the USB pin and the other end grounded. The second capacitor C2, the second resistor R2, and the second inductor L2 are connected in parallel, with one end connected to the USB pin and the other end grounded. The first suppressor D1, the second suppressor D2, the first resistor R1, the second resistor R2, the first capacitor C1, the second capacitor C2, the first inductor L1, and the second inductor L2 are all connected to the pins of the square USB interface U1.

[0031] In a preferred embodiment of the present invention, the TYPE-C interface circuit includes a third suppressor D3, a fourth suppressor D4, and a TYPE-C interface U2. The third suppressor D3 and the fourth suppressor D4 are respectively pulled down to ground on the differential line, and both the third suppressor D3 and the fourth suppressor D4 are connected to the pins of the TYPE-C interface U2.

[0032] In a preferred embodiment of the present invention, the USB switch circuit includes a fifth diode D5, a third capacitor C3, a fourth capacitor C4, and a USB switch chip U3. One end of the fifth diode D5 is connected to the power supply, and the other end is connected to the pin of the USB switch chip U3. The third capacitor C3 and the fourth capacitor C4 are connected in parallel, with one end connected to the path from the fifth diode D5 to the switch pin, and the other end grounded.

[0033] In a preferred embodiment of the present invention, the parallel circuit includes a sixth diode D6 and a seventh diode D7. One end of the sixth diode D6 is connected to the USB interface circuit and the other end is connected to the power supply. One end of the seventh diode D7 is connected to the TYPE-C interface circuit and the other end is connected to the power supply.

[0034] In a preferred embodiment of the present invention, the power chip circuit includes a third resistor R3, a fourth resistor R4, a fifth capacitor C5, a sixth capacitor C6, a third inductor L3, and a fourth power chip U4. One end of the third resistor R3 is connected to the output voltage, and the other end is connected to the power chip pin. One end of the fourth resistor R4 is connected to the third resistor R3, and the other end is grounded. One end of the fifth capacitor C5 is connected to the power supply, and the other end is grounded. One end of the sixth capacitor C6 is connected to the output voltage, and the other end is grounded. One end of the third inductor L3 is connected to the pin of the fourth power chip U4, and the other end is connected to the output voltage.

[0035] In a preferred embodiment of the present invention, the XOR gate circuit includes a seventh capacitor C7, an eighth diode D8, and a fifth XOR gate chip U5. One end of the seventh capacitor C7 is grounded and the other end is connected to the power supply. One end of the eighth diode D8 is connected to the pin of the fifth XOR gate chip and the other end is connected to the power supply.

[0036] In a preferred embodiment of the present invention, the connector circuit includes an eighth capacitor C8 and a connector P1. One end of the eighth capacitor C8 is grounded, the other end is connected to the input voltage, and it is also connected to the pin of the connector P1.

[0037] In a preferred embodiment of the present invention, the indicator light circuit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a ninth lamp D9, and a tenth lamp D10. One end of the fifth resistor R5 is connected to the power supply, and the other end is connected to the ninth lamp D9. One end of the sixth resistor R6 is connected to the control signal, and the other end is connected to the tenth lamp D10. One end of the seventh resistor R7 is connected to the power supply, and the other end is connected to the control signal. One end of the ninth lamp D9 is connected to the fifth resistor R5, and the other end is grounded. One end of the tenth lamp D10 is connected to the sixth resistor R6, and the other end is grounded.

[0038] In a specific embodiment of the present invention, a module capable of switching power supply and data transmission is provided.

[0039] The switchable power supply and data transmission module of this invention includes: a USB interface circuit, a TYPE-C interface circuit, a USB switch circuit, a parallel circuit, a power chip circuit, an XOR gate circuit, a connector circuit, and an indicator light circuit. The USB interface circuit and the TYPE-C interface circuit are two input / output ports; the USB switch circuit can switch the desired communication interface; the power chip circuit can increase the current; the power chip circuit can be designed with the output voltage according to requirements; the XOR gate circuit generates high and low levels as control signals for the USB switch; the connector circuit ultimately powers the communication module and enables data transmission; and the indicator light circuit controls the signal indicator light and the working indicator light.

[0040] The USB interface circuit includes a first suppressor D1, a second suppressor D2, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a first inductor L1, a second inductor L2, and a square USB interface U1.

[0041] The first suppressor D1 and the second suppressor D2 are pulled down to ground on the differential line respectively. The first capacitor C1, the first resistor R1 and the first inductor L1 are connected in parallel, with one end connected to the USB pin and the other end grounded. The second capacitor C2, the second resistor R2 and the second inductor L2 are connected in parallel, with one end connected to the USB pin and the other end grounded. The square USB interface U1 contains 6 pins, 3 ground pins, 2 differential signal pins and 1 power pin.

[0042] The TYPE-C interface circuit includes a third suppressor D3, a fourth suppressor D4, and a TYPE-C interface U2; wherein the third suppressor D3 and the fourth suppressor D4 are pulled down to ground on the differential lines respectively; the TYPE-C interface U2 has 28 pins, 8 to ground, 4 to power, and 16 unconnected pins.

[0043] The USB switch circuit includes a fifth diode D5, a third capacitor C3, a fourth capacitor C4, and a USB switch chip U3. One end of the fifth diode D5 is connected to 4.5V, and the other end is connected to a pin of the USB switch. The third capacitor C3 and the fourth capacitor C4 are connected in parallel, with one end connected to the path from the fifth diode D5 to the switch pin, and the other end grounded. The USB switch chip U3 has 10 pins: 6 differential signals, 2 ground pins, 1 control signal pin, and 1 power supply pin.

[0044] The parallel circuit includes a sixth diode D6 and a seventh diode D7; one end of the sixth diode D6 is connected to the USB power supply, and the other end is connected to 4.5V. One end of the seventh diode D7 is connected to the Type-C interface circuit power supply, and the other end is connected to 4.5V.

[0045] The power chip circuit includes a third resistor R3, a fourth resistor R4, a fifth capacitor C5, a sixth capacitor C6, a third inductor L3, and a fourth power chip U4. One end of the third resistor R3 is connected to the output voltage, and the other end is connected to a power chip pin. One end of the fourth resistor R4 is connected to the third resistor R3, and the other end is grounded. One end of the fifth capacitor C5 is connected to 4.5V, and the other end is grounded. One end of the sixth capacitor C6 is connected to the output voltage, and the other end is grounded. One end of the third inductor L3 is connected to a power chip pin, and the other end is connected to the output voltage. The fourth power chip U4 has 11 pins: 6 grounded, 2 connected to the input voltage, 1 connected to the third inductor L3, 1 connected to the fourth resistor R4, and 1 connected to the output voltage.

[0046] The XOR gate circuit includes a seventh capacitor C7, an eighth diode D8, and a fifth XOR gate chip U5. One end of the seventh capacitor C7 is grounded, and the other end is connected to 4.5V. One end of the eighth diode D8 is connected to the XOR gate pin, and the other end is connected to the 4.5V voltage. The fifth XOR gate chip U5 has 5 pins: 1 is grounded, 2 are connected to the input high and low levels, and 1 is connected to D8.

[0047] The connector circuit includes an eighth capacitor C8 and a connector P1; one end of the eighth capacitor C8 is grounded and the other end is connected to the input voltage; the connector P1 has 7 pins, 1 grounded, 1 connected to the input voltage, 1 for control signal, 2 for differential signal, and 2 unused pins.

[0048] The indicator light circuit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a ninth lamp D9, and a tenth lamp D10. One end of the fifth resistor R5 is connected to 5V1, and the other end is connected to D9. One end of the sixth resistor R6 is connected to the control signal, and the other end is connected to D10. One end of the seventh resistor R7 is connected to 5V1, and the other end is connected to the control signal. One end of the ninth lamp D9 is connected to R5, and the other end is grounded. One end of the tenth lamp D10 is connected to R6, and the other end is grounded.

[0049] The specific working process of this invention is as follows:

[0050] Appendix Figure 1 As shown in the diagram, the USB interface circuit and the TYPE-C interface circuit can each generate their own 5V power and USB power. The 5V power is connected in parallel to generate a total power, and when both power sources are applied, the current that can be handled is greater. The total power then passes through the power chip circuit, and the required voltage can be output by adjusting the resistor as needed. (See attached diagram.) Figure 2 In the circuit, the USB interface circuit and the TYPE-C interface circuit each generate their own 5V voltage, which is then applied to the XOR gate circuit and the USB switch circuit, respectively, to select whether the USB is connected to USB1 or USB2; (See attached...) Figure 3 In the circuit, the indicator light circuit consists of a signal light and a power light. The power light illuminates immediately upon power-on, while the signal light is controlled by high and low level signal outputs. The specific USB interface circuit, TYPE-C interface circuit, USB switch circuit, parallel circuit, power chip circuit, XOR gate circuit, connector circuit, and indicator light circuit are shown in the attached figures. Figure 4 - Appendix Figure 11 As shown.

[0051] This solution features two input / output ports for user convenience. Both ports can be inserted simultaneously to increase the power supply current, enabling the power supply to more powerful devices. The module is small in size, rationally laid out, uses PCB layout for circuit design, employs surface mount components, has a simple manufacturing process, and is relatively low in cost.

[0052] For the specific implementation scheme of this embodiment, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0053] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0054] It should be noted that in the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means at least two.

[0055] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] The system employing this invention enables switchable power supply and data transmission, allowing users to choose the most convenient method for powering the communication module and transmitting data. Simultaneously, USB and Type-C can be inserted, increasing the power supply current. The module of this invention is small in size, simple in manufacturing process, and low in cost. Through a rational layout and routing conversion network, the size is significantly reduced. Furthermore, the board uses PCB layout with surface-mount components, simplifying the manufacturing process and reducing costs.

[0057] In this specification, the invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A system for implementing switchable power supply and data transmission, characterized in that, The system includes a USB interface circuit, a TYPE-C interface circuit, a parallel circuit, a power chip circuit, a USB switch circuit, an XOR gate circuit, a connector circuit, and an indicator light circuit. The USB interface circuit and the TYPE-C interface circuit are two input / output ports, both connected to the parallel circuit. The parallel circuit is connected to the power chip circuit. Both the USB interface circuit and the TYPE-C interface circuit are also connected to the USB switch circuit. The XOR gate circuit is connected to the USB switch circuit. The USB switch circuit is used to switch the interface to be communicated. The XOR gate circuit generates high and low levels as control signals for the USB switch. The power chip circuit is used to design the output voltage according to requirements and to increase the current. The connector circuit powers the communication module for data transmission. The indicator light circuit controls the signal indicator light and the working indicator light. The connector circuit is connected to the power chip circuit and the USB switch circuit. The indicator light circuit is connected to the parallel circuit and the connector. The USB interface circuit includes a first suppressor (D1), a second suppressor (D2), a first resistor (R1), a second resistor (R2), a first capacitor (C1), a second capacitor (C2), a first inductor (L1), a second inductor (L2), and a square USB interface (U1). The first suppressor (D1) and the second suppressor (D2) are pulled down to ground on the differential line. The first capacitor (C1), the first resistor (R1), and the first inductor (L1) are connected in parallel, with one end connected to the USB pin and the other end grounded. The second capacitor (C2), the second resistor (R2), and the second inductor (L2) are also connected in parallel, with one end connected to the USB pin and the other end grounded. The first suppressor (D1), the second suppressor (D2), the first resistor (R1), the second resistor (R2), the first capacitor (C1), the second capacitor (C2), the first inductor (L1), and the second inductor (L2) are all connected to the pins of the square USB interface (U1). The TYPE-C interface circuit includes a third suppressor (D3), a fourth suppressor (D4), and a TYPE-C interface (U2). The third suppressor (D3) and the fourth suppressor (D4) are pulled down to ground on the differential lines, and both the third suppressor (D3) and the fourth suppressor (D4) are connected to the pins of the TYPE-C interface (U2).

2. The system for implementing switchable power supply and data transmission according to claim 1, characterized in that, The USB switch circuit includes a fifth diode (D5), a third capacitor (C3), a fourth capacitor (C4), and a USB switch chip (U3). One end of the fifth diode (D5) is connected to the power supply, and the other end is connected to the pin of the USB switch chip (U3). The third capacitor (C3) and the fourth capacitor (C4) are connected in parallel, with one end connected to the path from the fifth diode (D5) to the switch pin, and the other end grounded.

3. The system for implementing switchable power supply and data transmission according to claim 1, characterized in that, The parallel circuit includes a sixth diode (D6) and a seventh diode (D7). One end of the sixth diode (D6) is connected to the USB interface circuit and the other end is connected to the power supply. One end of the seventh diode (D7) is connected to the TYPE-C interface circuit and the other end is connected to the power supply.

4. The system for implementing switchable power supply and data transmission according to claim 1, characterized in that, The power chip circuit includes a third resistor (R3), a fourth resistor (R4), a fifth capacitor (C5), a sixth capacitor (C6), a third inductor (L3), and a fourth power chip (U4). One end of the third resistor (R3) is connected to the output voltage, and the other end is connected to the power chip pin. One end of the fourth resistor (R4) is connected to the third resistor (R3), and the other end is grounded. One end of the fifth capacitor (C5) is connected to the power supply, and the other end is grounded. One end of the sixth capacitor (C6) is connected to the output voltage, and the other end is grounded. One end of the third inductor (L3) is connected to the pin of the fourth power chip (U4), and the other end is connected to the output voltage.

5. The system for implementing switchable power supply and data transmission according to claim 1, characterized in that, The XOR gate circuit includes a seventh capacitor (C7), an eighth diode (D8), and a fifth XOR gate chip (U5). One end of the seventh capacitor (C7) is grounded and the other end is connected to the power supply. One end of the eighth diode (D8) is connected to the pin of the fifth XOR gate chip and the other end is connected to the power supply.

6. The system for implementing switchable power supply and data transmission according to claim 1, characterized in that, The connector circuit includes an eighth capacitor (C8) and a connector (P1). One end of the eighth capacitor (C8) is grounded, and the other end is connected to the input voltage and is also connected to the pin of the connector (P1).

7. The system for implementing switchable power supply and data transmission according to claim 1, characterized in that, The indicator light circuit includes a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), a ninth lamp (D9), and a tenth lamp (D10). One end of the fifth resistor (R5) is connected to the power supply, and the other end is connected to the ninth lamp (D9). One end of the sixth resistor (R6) is connected to the control signal, and the other end is connected to the tenth lamp (D10). One end of the seventh resistor (R7) is connected to the power supply, and the other end is connected to the control signal. One end of the ninth lamp (D9) is connected to the fifth resistor (R5), and the other end is grounded. One end of the tenth lamp (D10) is connected to the sixth resistor (R6), and the other end is grounded.

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