Signal conversion circuit

Abstract

This invention provides a signal conversion circuit. The input and output terminals of the voltage adjustment circuit are respectively coupled to the power supply voltage and the output terminal of the signal conversion circuit. The control circuit provides a control signal to the control terminal of the voltage adjustment circuit, and controls the signal level change of the control signal corresponding to the input data signal to switch between a first control voltage level and a second control voltage level, or determines whether to provide a default voltage to the output terminal of the voltage adjustment circuit based on the input data signal, so as to convert the input data signal into a data power supply signal.

Description

Technical Field

[0001] This invention relates to a signal conversion circuit, and more particularly to a signal conversion circuit that integrates data signals and power signals. Background Technology

[0002] Generally, data signals and power signals are transmitted independently, requiring two separate lines. However, some products have limited space, making it impossible to accommodate separate data and power signal wiring, thus significantly increasing the difficulty of wiring. Furthermore, this increased wiring difficulty often leads to unnecessary extension of the wiring, making signals susceptible to interference or attenuation during long-distance transmission.

[0003] In addition, existing products often use multiple voltage levels to generate data signals. When the product has limited space, it is not easy to adopt circuit designs with multiple voltage levels. Furthermore, multiple voltage levels also bring more signal interference problems. Summary of the Invention

[0004] This invention provides a signal conversion circuit that can effectively reduce wiring difficulty and ensure signal transmission quality.

[0005] The signal conversion circuit of this invention includes a voltage adjustment circuit and a control circuit. The input and output terminals of the voltage adjustment circuit are respectively coupled to a power supply voltage and the output terminal of the signal conversion circuit. The control circuit is coupled to the voltage adjustment circuit, providing a control signal to the control terminal of the voltage adjustment circuit. Based on the input data signal, the control circuit controls the signal level of the input data signal to switch between a first control voltage level and a second control voltage level, or determines whether to provide a default voltage to the output terminal of the voltage adjustment circuit based on the input data signal, thereby converting the input data signal into a data power signal.

[0006] Based on the above, in this embodiment of the invention, the input and output terminals of the voltage adjustment circuit are respectively coupled to the power supply voltage and the output terminal of the signal conversion circuit. The control circuit can provide a control signal to the control terminal of the voltage adjustment circuit, and control the signal level of the input data signal to switch between a first control voltage level and a second control voltage level according to the input data signal, or determine whether to provide a default voltage to the output terminal of the voltage adjustment circuit according to the input data signal, so as to convert the input data signal into a data power signal. In this way, the input data signal and the power supply voltage are integrated to generate a data power signal. Only one transmission line is needed to simultaneously transmit the data signal and the power signal, which can reduce the wiring difficulty and ensure that the data signal is not interfered with in the case of long-distance transmission, thereby greatly improving the signal transmission quality.

[0007] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of an embodiment of the signal conversion circuit of the present invention;

[0009] Figure 2 This is a schematic diagram of another embodiment of the signal conversion circuit of the present invention;

[0010] Figure 3 yes Figure 2 An embodiment of the operation timing diagram of a signal conversion circuit;

[0011] Figure 4 This is a schematic diagram of another embodiment of the signal conversion circuit of the present invention;

[0012] Figure 5 This is a schematic diagram of another embodiment of the signal conversion circuit of the present invention;

[0013] Figure 6 yes Figure 5 An embodiment of the timing diagram for the operation of the signal conversion circuit in this embodiment;

[0014] Figure 7 This is a schematic diagram of another embodiment of the signal conversion circuit of the present invention. Detailed Implementation

[0015] Figure 1 This is a schematic diagram of an embodiment of the signal conversion circuit according to the present invention. Please refer to... Figure 1The signal conversion circuit 100 includes a control circuit 102 and a voltage adjustment circuit 103. The voltage adjustment circuit 103 has a control terminal, an input terminal, and an output terminal. In this embodiment, the voltage adjustment circuit 103 is implemented using a bipolar junction transistor (BJT), wherein the control terminal, input terminal, and output terminal of the voltage adjustment circuit 103 are the base, collector, and emitter of the bipolar junction transistor Q1, respectively. The collector and emitter of the bipolar junction transistor Q1 are coupled to the power supply voltage VCC and the output terminal TO of the signal conversion circuit 100, respectively. The control circuit 102 is coupled to the bipolar junction transistor Q1. The control circuit 102 can provide a control signal SC1 to the base of the bipolar junction transistor Q1 according to the input data signal S1 to convert the input data signal S1 into a data power supply signal SO1. For example, if the data signal S1 is a digital signal, the control signal SC1 switches between two different control voltage levels corresponding to the signal level of the input data signal S1, and then outputs the data power supply signal SO1 at the output terminal TO of the signal conversion circuit 100. The data power signal SO1 can switch between different voltage levels in response to the voltage switching of the control signal SC1. It can also be regarded as the data power signal SO1 switching between different voltage levels in response to the signal level change of the input data signal S1. Therefore, the data power signal SO1 can carry the data content included in the input data signal S1 while also serving as a power signal.

[0016] Alternatively, the control circuit 102 can provide a control signal SC1 to the base of the bipolar transistor Q1 to turn on the bipolar transistor Q1, and determine whether to set the voltage of the output terminal TO of the signal conversion circuit 100 to the default voltage VCT based on the input data signal S1, so as to convert the input data signal S1 into a data power signal SO1, and output the corresponding data power signal SO1 at the output terminal TO of the signal conversion circuit 100. Here, the default voltage VCT is not equal to the power supply voltage VCC. Since the data power signal SO1 can change its signal level according to whether the control circuit 102 provides the default voltage VCT to the output terminal TO of the signal conversion circuit 100, it can also be regarded as the data power signal SO1 switching between different voltage levels according to the signal level change of the input data signal S1. Therefore, the data power signal SO1 can carry the data content included in the input data signal S1 while acting as a power signal.

[0017] The data power signal SO1 can be output to the load circuit 104 at the back end, for example. For example, the level of the data power signal SO1 varies between 4.8 and 5V, and the load circuit 104 may include a decoding circuit, active components, and / or passive components. The decoding circuit can decode the level changes of the data power signal SO1 into a data signal and a power signal, and provide the data signal and the power signal to the data signal processing circuit and the power supply circuit, respectively.

[0018] By integrating the input data signal S1 with the power supply voltage VCC to generate the data power signal SO1, the data power signal SO1 can not only be used as a power signal, but also carry the data content included in the input data signal S1. Therefore, only one transmission line is needed to achieve the purpose of transmitting data signals and power signals at the same time, which can reduce the wiring difficulty and ensure that the data signal will not be interfered with in the case of long-distance transmission, thereby greatly improving the signal transmission quality.

[0019] Another embodiment of the signal conversion circuit of the present invention may be as follows: Figure 2 As shown, in Figure 2 In this embodiment, the control circuit 102 may include a switching circuit 202, a voltage divider circuit 204, a switching circuit 206, and a voltage divider circuit 208. The switching circuit 202 is coupled between the voltage divider circuit 204 and the reference voltage VSS. In this embodiment, the switching circuit 202 is implemented using an N-type transistor M1. The reference voltage VSS may be, for example, ground voltage or another default voltage, but is not limited thereto. In this embodiment, the power supply voltage VCC is set to a high voltage level, while the reference voltage VSS is set to a low voltage level (relative to the power supply voltage VCC). The voltage divider circuit 204 is coupled between the power supply voltage VCC and the switching circuit 202, and is also coupled to the control terminal of the switching circuit 206. The voltage divider circuit 204 may, for example, be a... Figure 2 The voltage divider circuit 208 is implemented using resistors R1 and R2, but is not limited to this; other active and / or passive components can also be used to achieve the voltage divider function. In this embodiment, resistors R1 and R2 are connected in series between the power supply voltage VC and transistor M1. The contacts of resistors R1 and R2 are coupled to the control terminal of the switching circuit 206. Resistor R1 is coupled between the power supply voltage VCC and the control terminal of the switching circuit 206, and resistor R2 is coupled between the control terminal of the switching circuit 206 and the reference voltage VSS. The switching circuit 206 is coupled between the power supply voltage VCC and the output terminal TO of the signal conversion circuit 100. The switching circuit 206 can be implemented, for example, using a P-type transistor M2, but is not limited to this. In addition, the voltage divider circuit 208 includes resistors R3 and R4. Resistor R3 is coupled between the power supply voltage VCC and the base of bipolar transistor Q1, and resistor R4 is coupled between the base of bipolar transistor Q1 and the reference voltage VSS.

[0020] like Figure 3As shown, the voltage divider circuit 208, composed of resistors R3 and R4, divides the power supply voltage VCC to generate a turn-on voltage V1, which serves as the control signal SC1 to the base of the bipolar transistor Q1, thus turning on the bipolar transistor Q1. When the input data signal S1 is at a high voltage level, the switch circuit 202 (N-type transistor M1) is turned on to provide a control signal SCON at a first control voltage level (e.g., a low voltage level). Resistors R1 and R2 of the voltage divider circuit 204 divide the power supply voltage VCC to provide a divided voltage to the control terminal of the switch circuit 206, causing the voltage at the control terminal of the switch circuit 206 (i.e., the gate of the P-type transistor M2) to be pulled low, and the switch circuit 206 (P-type transistor M2) thus enters the on state. After the switch circuit 206 is turned on, the power supply voltage VCC can be provided to the output terminal TO of the signal conversion circuit 100 via the switch circuit 206, so that the data power signal SO1 is at the first output voltage level VL1. Furthermore, when the input data signal S1 is at a low voltage level, the switching circuit 202 (N-type transistor M1) is turned off, and the control signal SCON switches to a second control voltage level (e.g., a high voltage level). This causes the voltage at the control terminal of the switching circuit 206 (i.e., the gate of the P-type transistor M2) to be pulled high, and the switching circuit 206 (P-type transistor M2) thus enters an off state. At this time, the bipolar transistor Q1 is turned on according to the control signal SC1, providing the data power signal SO1 at the second output voltage level VL2 to the output terminal TO of the signal conversion circuit 100. In this embodiment, since the voltage drop across the drain and source of transistor M2 is less than the voltage drop across the collector and emitter of bipolar transistor Q1, the first output voltage level VL1 is higher than the second output voltage level VL2. In other embodiments, the circuit design of the control circuit 102 can be adjusted to set the first output voltage level VL1 to be lower than the second output voltage level VL2.

[0021] In another embodiment, the control circuit 102 may further include a Zener diode, such as Figure 4 As shown, the Zener diode ZD1 can be coupled between the base of the bipolar transistor Q1 and the reference voltage VSS, thereby achieving the effect of stabilizing the data power supply signal SO1. Furthermore, in other embodiments, this diode can be omitted. Figure 3 The voltage divider circuits 204 and 208 in the embodiments may be used, or only one of voltage divider circuits 204 and 208 may be used. For example, when voltage divider circuit 204 is not used, the switching circuit 202 (the drain of N-type transistor M1) can be directly coupled to the control terminal of the switching circuit 206 (i.e., the gate of P-type transistor M2). When voltage divider circuit 208 is not used, the base of bipolar transistor Q1 is directly coupled to the power supply voltage VCC.

[0022] Figure 5This is a schematic diagram of another embodiment of the signal conversion circuit according to the present invention. Compared to Figure 2 In this embodiment, the control circuit 102 does not include the switching circuit 206 and the voltage divider circuit 208. In this embodiment, the contacts of resistors R1 and R2 are coupled to the base of bipolar transistor Q1. Resistor R1 is coupled between the power supply voltage VCC and the base of bipolar transistor Q1, and resistor R2 is coupled between the base of bipolar transistor Q1 and the switching circuit 202. The switching circuit 202 (N-type transistor M1) determines whether to conduct based on the input data signal S1, connecting the voltage divider circuit 204 to the reference voltage VSS. This causes the control signal SC1 generated by the voltage divider circuit 204 to switch between a first control voltage level (e.g., a low voltage level) and a second control voltage level (e.g., a high voltage level), thereby causing the data power supply signal SO1 generated by bipolar transistor Q1 to switch between a low voltage level and a high voltage level. Figure 6 As shown, when the input data signal S1 is at a high voltage level, the switching circuit 202 (N-type transistor M1) is turned on, connecting the voltage divider circuit 204 to the reference voltage VSS. Resistors R1 and R2 in the voltage divider circuit 204 divide the power supply voltage VCC, generating a low-voltage control signal SC1 to the base of the bipolar transistor Q1, and generating a first output voltage level VL3 data power signal SO1 at the emitter of the bipolar transistor Q1. Furthermore, when the input data signal S1 is at a low voltage level, the switching circuit 202 is turned off, and the control signal SC1 is at a high voltage level, causing the emitter of the bipolar transistor Q1 to generate a second output voltage level VL4 data power signal SO1. In this embodiment, the first output voltage level VL3 is lower than the second output voltage level VL4. Compared to... Figure 2 In this embodiment, the signal conversion circuit 100 further simplifies the circuit structure. Besides reducing wiring complexity and ensuring data signals are not interfered with during long-distance transmission, it also improves signal transmission delay and further enhances signal transmission quality. Furthermore, the signal conversion circuit 100 uses only a single power supply voltage, VCC, which effectively reduces signal interference.

[0023] In another embodiment, Figure 5 The control circuit 102 in this embodiment may also include a Zener diode ZD1, such as Figure 7 As shown, the Zener diode ZD1 can be coupled between the base of the bipolar transistor Q1 and the reference voltage VSS, thereby achieving the effect of stabilizing the data power supply signal SO1.

[0024] The above embodiment uses a bipolar transistor Q1 to implement the voltage adjustment circuit 103; however, the implementation of the voltage adjustment circuit 103 is not limited thereto. For example, in other embodiments, the voltage adjustment circuit 103 may also be implemented using a P-type metal-oxide-semiconductor (MOSFET) or an N-type MOSFET. For example, in... Figure 2 , Figure 4 In the embodiments, if the voltage adjustment circuit 103 is implemented using a P-type metal-oxide-semiconductor (the source of the P-type metal-oxide-semiconductor is coupled to the power supply voltage VCC, the drain is coupled to the output of the signal conversion circuit 100, and the gate receives the control signal SC1), the P-type metal-oxide-semiconductor can operate in the triode region, and the P-type metal-oxide-semiconductor and transistor M2 can output different voltages, so that the data power supply signal SO1 switches between different voltage levels. Similarly, in Figure 5 , Figure 7 In one embodiment, if the voltage adjustment circuit 103 is implemented using a P-type metal-oxide-semiconductor transistor, the data power signal SO1 can be switched between different voltage levels by changing the gate bias voltage of the P-type metal-oxide-semiconductor transistor.

[0025] In summary, the input and output terminals of the voltage adjustment circuit in this embodiment of the invention are respectively coupled to the power supply voltage and the output terminal of the signal conversion circuit. The control circuit can provide a control signal to the control terminal of the voltage adjustment circuit, and control the signal level of the input data signal to switch between two different control voltage levels according to the input data signal, or determine whether to provide a default voltage to the output terminal of the voltage adjustment circuit according to the input data signal, so as to convert the input data signal into a data power signal. In this way, the input data signal and the power supply voltage are integrated to generate a data power signal. Only one transmission line is needed to simultaneously transmit the data signal and the power signal, which can reduce the wiring difficulty and ensure that the data signal is not interfered with in the case of long-distance transmission, thereby greatly improving the signal transmission quality.

[0026] For example, this invention can be applied to practical system applications such as next-generation WiFi wireless access points, integrated omnidirectional positioning systems, RF configuration of 5G modules, and ultra-low power modules for LTE CAT-M1.

[0027] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A signal conversion circuit, characterized in that, include: The voltage adjustment circuit includes a control terminal, an input terminal coupled to the power supply voltage, and an output terminal coupled to the output terminal of the signal conversion circuit. as well as A control circuit, coupled to the voltage adjustment circuit, provides a control signal to the control terminal of the voltage adjustment circuit. Based on the input data signal, the control circuit controls the signal level of the control signal corresponding to the input data signal to switch between a first control voltage level and a second control voltage level, or determines whether to provide a default voltage to the output terminal of the voltage adjustment circuit based on the input data signal, thereby converting the input data signal into a data power signal. The control terminal of the voltage adjustment circuit is coupled to the power supply voltage to receive the control signal. The control circuit includes: The first switching circuit receives the input data signal at its control terminal. as well as The second switching circuit is coupled between the power supply voltage and the output terminal of the voltage adjustment circuit. The first switching circuit is coupled between the control terminal of the second switching circuit and the reference voltage. The first switching circuit determines whether to connect the control terminal of the second switching circuit to the reference voltage based on the input data signal, and accordingly turns the second switching circuit on or off.

2. The signal conversion circuit according to claim 1, characterized in that, The first switching circuit includes: A transistor is coupled between the control terminal of the second switching circuit and the reference voltage, and the control terminal of the transistor receives the input data signal.

3. The signal conversion circuit according to claim 1, characterized in that, The second switching circuit includes: A transistor is coupled between the power supply voltage and the output terminal of the voltage regulation circuit, and the control terminal of the transistor is coupled to the first switching circuit.

4. The signal conversion circuit according to claim 1, characterized in that, Also includes: A voltage divider circuit is coupled to the power supply voltage, the control terminals of the first switching circuit and the second switching circuit. When the first switching circuit is turned on, it divides the power supply voltage to provide a voltage divider to the control terminal of the second switching circuit.

5. The signal conversion circuit according to claim 4, characterized in that, The voltage divider circuit includes: A first resistor is coupled between the power supply voltage and the control terminal of the second switching circuit; and The second resistor is coupled between the control terminal of the second switching circuit and the first switching circuit.

6. The signal conversion circuit according to claim 1, characterized in that, Also includes: A voltage divider circuit is coupled between the power supply voltage and the reference voltage. It divides the power supply voltage and provides a conduction voltage as the control signal to the control terminal of the voltage adjustment circuit. The conduction voltage controls the voltage adjustment circuit to provide the power supply voltage.

7. The signal conversion circuit according to claim 6, characterized in that, The voltage divider circuit includes: A third resistor is coupled between the power supply voltage and the control terminal of the voltage adjustment circuit; and The fourth resistor is coupled between the control terminal of the voltage adjustment circuit and the reference voltage.

8. The signal conversion circuit according to claim 1, characterized in that, Also includes: A Zener diode, whose cathode and anode are respectively coupled to the control terminal of the voltage adjustment circuit and the reference voltage.

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