A signal conversion device

Abstract

This invention discloses a signal conversion device, including a power supply unit and multiple signal conversion units cascaded together, with the power supply unit electrically connected to the multiple signal conversion units. Each signal conversion unit includes a terminal block, an input / output switch, and a level conversion module. Each input / output switch includes a first signal pin layer and a second signal pin layer. When the first signal pin layer is connected, a signal input path is formed between the terminal block and the level conversion module. When the second signal pin layer is connected, a signal output path is formed between the level conversion module and the terminal block. When the first signal pin layer of one signal conversion unit is connected, the terminal block of that signal conversion unit is used for signal input. At this time, the second signal pin layer of at least one other signal conversion unit is set to be connected, and the terminal block of that signal conversion unit is used for signal output.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuit technology, and in particular to a signal conversion device. Background Technology

[0002] In the research, development, production, debugging, and maintenance of electronic equipment, signal conversion devices are core auxiliary equipment for realizing the interaction of signals in different voltage domains and adapting to the working requirements of various electronic devices. They are widely used in scenarios such as microcontroller development, sensor signal debugging, and weak current module linkage testing.

[0003] Currently, existing signal conversion equipment suffers from problems such as limited functionality, poor adaptability to multiple voltages, and inconvenience in switching signal flow directions. Furthermore, the voltage regulation, signal input / output switching, and delay control functions of existing signal conversion equipment must be implemented through discrete modules, resulting in complex operation and poor interface compatibility. Summary of the Invention

[0004] The present invention provides a signal conversion device to overcome at least one defect in the prior art.

[0005] This invention provides a signal conversion device, including: a power supply unit and multiple signal conversion units, wherein the multiple signal conversion units are cascaded, and the power supply unit is electrically connected to the multiple signal conversion units;

[0006] One of the signal conversion units includes a terminal block, an input / output switch, and a level conversion module;

[0007] Each of the input / output switching switches includes a first signal pin layer and a second signal pin layer. When the first signal pin layer is connected, a signal input path is formed between the terminal and the level conversion module; when the second signal pin layer is connected, a signal output path is formed between the level conversion module and the terminal.

[0008] When the first signal pin layer of a signal conversion unit is connected, the terminal of the signal conversion unit is used for signal input. At this time, the second signal pin layer of at least another signal conversion unit is set to be connected, and the terminal of the signal conversion unit is used for signal output.

[0009] Optionally, one of the signal conversion units further includes a voltage switching switch;

[0010] The power supply unit includes multiple outputs, and a voltage switching switch includes several power input pins and a common pin. One output of the power supply unit is electrically connected to one of the power input pins.

[0011] The voltage switching switch is equipped with a first slider, which is used to connect one of the power input pins to the common pin.

[0012] The input / output switching switch includes a power supply pin, the common pin is electrically connected to the power supply pin, and the power supply pin is electrically connected to the power supply terminal of the level conversion module.

[0013] Optionally, the input / output switching switch further includes a second slider, a first port, and a second port;

[0014] When the second slider is connected to the first signal pin layer, the terminal block, the first port, the second port and the level conversion module form a signal input path; when connected to the second signal pin layer, the terminal block, the first port, the second port and the level conversion module form a signal output path.

[0015] When cascaded, the second port of each of the input / output switching switches is electrically connected.

[0016] Optionally, the input / output switching switch includes a first signal pin, a second signal pin, a third signal pin, a fourth signal pin, and a fifth signal pin, wherein the first signal pin and the fifth signal pin are electrically connected;

[0017] The first port is electrically connected to the third signal pin, the second signal pin is electrically connected to the first terminal of the level conversion module, and the fourth signal pin is electrically connected to the second terminal of the level conversion module;

[0018] The first signal pin of each of the input / output switching switches is electrically connected, and the first signal pin serves as the second port;

[0019] When the second slider forms the signal input path, it shorts the second signal pin, the third signal pin, and the fourth signal pin and the fifth signal pin. When it forms the signal output path, it shorts the first signal pin, the second signal pin, and the third signal pin and the fourth signal pin.

[0020] Optionally, the power supply pins include a first power supply pin, a second power supply pin, a third power supply pin, and a fourth power supply pin, with the first power supply pin of each input / output switch being electrically connected;

[0021] The common pin is electrically connected to the third power supply pin, the first power supply pin is electrically connected to the first power supply terminal of the level conversion module, the fourth power supply pin is electrically connected to the second power supply terminal of the level conversion module, and the second power supply pin is electrically connected to the fourth power supply pin.

[0022] When the second slider forms the signal input path, it shorts the first power supply pin, the second power supply pin, and the third power supply pin; when it forms the signal output path, it shorts the third power supply pin and the fourth power supply pin.

[0023] Optionally, the level conversion module is a unidirectional level conversion module, and the output terminal of the unidirectional level conversion module is configured with a delay circuit.

[0024] Optionally, the delay circuit includes an adjustable resistor and an adjustable capacitor, and the signal conversion device further includes a rheostat adjustment knob and a capacitor adjustment knob.

[0025] The variable resistor adjustment knob is electrically connected to the adjustable resistor, and the variable capacitor adjustment knob is electrically connected to the adjustable capacitor.

[0026] Optionally, the signal conversion device further includes a signal indicating circuit, which is electrically connected to the first port.

[0027] Optionally, the signal indication circuit includes a switching transistor, a resistor, and a light-emitting diode, and the voltage switching switch further includes a power input pin and a power output pin for the indication circuit.

[0028] The power output pin of the indicator circuit is electrically connected to the first terminal of the switching transistor through the resistor and the light-emitting diode. The second terminal of the switching transistor is grounded, and the control terminal of the switching transistor is electrically connected to the first port.

[0029] The power input pin of the indicator circuit is electrically connected to the power supply unit, and the first slider is also used to connect the power input pin of the indicator circuit and the power output pin of the indicator circuit.

[0030] Optionally, the power supply unit includes multiple linear regulators connected in series, with the output of one of the linear regulators electrically connected to one of the power input pins.

[0031] Optionally, a reverse connection protection diode is also configured in the signal path formed between the first port, the second port and the level conversion module.

[0032] Compared with existing technologies, the advantages of this invention are as follows: This invention proposes a signal conversion device, which includes a power supply unit, a voltage switching switch, an input / output switching switch, and a level conversion module. The input / output switching switch, through position switching, can achieve precise switching between signal input and output paths, adapting to practical scenarios involving bidirectional signal interaction. Through the layered pin configuration of the voltage switching switch and the input / output switching switch, switching between multiple modes can be achieved, reducing the need for external jumpers. Attached Figure Description

[0033] Figure 1 This is a block diagram of the signal conversion device in the embodiment;

[0034] Figure 2 This is a schematic diagram of the input / output switching switch pins in the embodiment;

[0035] Figure 3 This is a block diagram of another signal conversion device in the embodiment;

[0036] Figure 4 This is a schematic diagram of the signal conversion device in the embodiment;

[0037] Figure 5 This is a schematic diagram of the voltage switching switch pins in the embodiment;

[0038] Figure 6 This is a schematic diagram of the signal conversion device in the embodiment. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0040] Figure 1 This is a block diagram of the signal conversion device in the embodiment, for reference. Figure 1 The signal conversion device includes a power supply unit 101 and multiple signal conversion units, which are cascaded together. The power supply unit is electrically connected to the multiple signal conversion units.

[0041] A signal conversion unit includes a terminal block, an input / output switch, and a level conversion module. Each input / output switch includes a first signal pin layer and a second signal pin layer. When the first signal pin layer is connected, a signal input path is formed between the terminal block and the level conversion module. When the second signal pin layer is connected, a signal output path is formed between the level conversion module and the terminal block.

[0042] When the first signal pin layer of a signal conversion unit is connected, the terminal of the signal conversion unit is used for signal input. At this time, the second signal pin layer of at least another signal conversion unit is set to be connected, and the terminal of the signal conversion unit is used for signal output.

[0043] refer to Figure 1 In this scheme, taking the configuration of two signal conversion units as an example, one signal conversion unit includes an input / output switching switch 202-1 and a level conversion module 203-1, and the other signal conversion unit includes an input / output switching switch 202-2 and a level conversion module 203-2.

[0044] The power supply unit 101 is electrically connected to the input / output switching switch 202-1 and the input / output switching switch 202-2 respectively, thereby supplying power to the level conversion modules 203-1 and 203-2 respectively.

[0045] Input / output switch 202-1 includes a first port 2021-1 and a second port 2021-2, with the first port 2021-1 electrically connected to a terminal block. Input / output switch 202-2 includes a first port 2022-1 and a second port 2022-2, with the first port 2022-1 electrically connected to a terminal block. The second ports 2021-2 and 2022-2 are cascaded together.

[0046] In this solution, the power supply unit 101 may include a linear dropout regulator (LDO), which is configured to output one power signal. The LDO can be configured to output 1.2V, 1.8V, 3.3V, or 5V.

[0047] In this solution, the level conversion module is used to adjust the amplitude of the received signal so that the signal output by the level conversion module meets the voltage compatibility requirements of the external settings.

[0048] In this solution, the level conversion module can be designed using a level conversion chip. The power supply terminal of the level conversion chip is electrically connected to the power supply pin of the input / output switching switch, thereby receiving the power signal output by the power supply unit as the working voltage signal. The signal to be converted input to the level conversion chip is converted into a signal of the target amplitude after voltage adjustment and delay by the level conversion chip.

[0049] In this solution, the model of the level conversion chip used in the level conversion module can be set according to requirements. Its working principle is the same as that of existing technology, and the specific details will not be described in detail.

[0050] In this design, the first signal pin layer is the signal input pin layer, and the second signal pin layer is the signal output pin layer. The input / output switching switches of multiple signal conversion units operate independently. When one signal conversion unit is used as an input and the first signal pin layer is turned on, the terminal of that signal conversion unit serves as the main signal input port for connection to an external device under test. Simultaneously, when at least one other (or more) signal conversion units are used as inputs and their second signal pin layers are turned on, the terminals of these signal conversion units serve as signal output ports for connection to monitoring equipment (e.g., a logic analyzer).

[0051] Taking single input and single output as an example, when the input / output switch 202-1 is set to the input position, the first signal pin layer of the input / output switch 202-1 is turned on, and the external signal to be converted is input through the terminal block at the first port 2021-1, and then input to the level conversion module 203-1 after passing through the first signal pin layer of the input / output switch 202-1.

[0052] When the input / output switch 202-2 is set to the output position, the second signal pin layer of the input / output switch 202-2 is turned on. The signal output by the level conversion module 203-1 is input to the level conversion module 203-2 through the first signal pin layer of the input / output switch 202-1, the second port 2021-2, the second port 2022-2, and the second signal pin layer of the input / output switch 202-2. The output of the level conversion module 203-2 is output to the terminal at the first port 2022-1 through the second signal pin layer of the input / output switch 202-2, and then output to the monitoring equipment.

[0053] This embodiment proposes a signal conversion device, which includes a power supply unit, a voltage switching switch, an input / output switching switch, and a level conversion module. The input / output switching switch, through position switching, enables precise switching between signal input and output paths, adapting to practical scenarios involving bidirectional signal interaction. By using layered pin configurations for the voltage switching switch and the input / output switching switch, switching between multiple modes can be achieved, reducing the need for external jumpers.

[0054] Based on any of the aforementioned solutions, in one possible implementation, a signal conversion unit further includes a voltage switching switch. The power supply unit includes multiple outputs, and the voltage switching switch includes several power input pins and a common pin. One output of the power supply unit is electrically connected to one of the power input pins. The voltage switching switch is equipped with a first slider for connecting one power input pin to the common pin. The input / output switching switch includes a power pin, the common pin is electrically connected to the power pin, and the power pin is electrically connected to the power supply terminal of the level conversion module.

[0055] In this solution, the power supply unit may include multiple linear regulators, and one LDO may be configured for the output of one power signal. For example, four LDOs may be configured, one for 1.2V output, one for 1.8V output, one for 3.3V output, and one for 5V output.

[0056] In this scheme, the voltage switching switch can be a single-pole multi-throw switch. The single-pole multi-throw switch meets the switching requirements of multiple power signals. The multiple power input pins of the single-pole multi-throw switch correspond one-to-one with the multiple power outputs of the unit. The common pin of the single-pole multi-throw switch serves as the voltage output terminal and is electrically connected to the power pin of the input-output switching switch to realize the transmission of the selected voltage level.

[0057] In this design, the input / output switch includes a power supply pin. The power supply pin is electrically connected to the common pin of the voltage switching switch, and also electrically connected to the power supply terminal of the level conversion module. The power supply pin receives power from the selected level, providing a voltage reference for the corresponding level conversion module.

[0058] In this solution, the power supply unit has multiple outputs, and one output corresponds to a power input pin of the voltage switching switch. The first slider configured by the voltage switching switch can connect the target power input pin and the common pin, thereby enabling rapid switching between different power supply voltages.

[0059] Based on any of the aforementioned schemes, in one possible implementation, the input / output switching switch further includes a second slider, a first port, and a second port. When the second slider is connected to the first signal pin layer, the terminal block, the first port, the second port, and the level conversion module form a signal input path; when connected to the second signal pin layer, the terminal block, the first port, the second port, and the level conversion module form a signal output path; in cascaded configuration, the second port of each input / output switching switch is electrically connected.

[0060] In this design, the input / output switch includes a power supply pin, a first signal pin layer, a second signal pin layer, a first port, and a second port. The power supply pin is electrically connected to the common pin of the voltage switching switch, receiving power from the selected range and providing a voltage reference for the internal signal path of the switch. The first signal pin layer is connected to the signal input and signal output pins of the level conversion module, and the second signal pin layer is also connected to the signal input and signal output pins of the level conversion module. The first port is used for electrical connection to a terminal block, and the second port is used for cascading between signal conversion units.

[0061] In this scheme, when the second slider is switched to the first signal pin layer, the first port is connected to the signal input pin of the level conversion module through the first signal pin layer, and the signal output pin of the level conversion module is electrically connected to the second port through the first signal pin layer. External signals can be transmitted to the level conversion module through the terminal block and the first port.

[0062] In this scheme, when the second slider is configured to switch to the second signal pin layer, the first port is connected to the signal output pin of the level conversion module through the second signal pin layer, and the signal input pin of the level conversion module is electrically connected to the second port through the second signal pin layer. The signal output by one level conversion module can be transmitted to another level conversion module through the second port.

[0063] In this scheme, the input / output switch can also be set to the OFF position. When the second slider is switched to the OFF position, the input and output signal path between the first port and the second port is disconnected.

[0064] In this scheme, after the power supply unit is connected to an external power source, the LDO inside the power supply unit starts working and outputs multiple voltages. The target voltage is selected by the first slider of the voltage switching switch to power the level conversion module. Cutting off the power supply to the power supply unit 101, or switching the input / output switching switch 202 to the OFF position to cut off the signal path, can achieve signal pause during the debugging process.

[0065] Figure 2 This is a schematic diagram of the input / output switching switch pins in the embodiment, for reference. Figure 1 and Figure 2 In one possible implementation, the input / output switching switch includes a first signal pin 9, a second signal pin 8, a third signal pin 7, a fourth signal pin 6, and a fifth signal pin 5, with the first signal pin 9 and the fifth signal pin 5 being electrically connected.

[0066] The first port 2021 is electrically connected to the third signal pin 7, the second signal pin 8 is electrically connected to the first terminal of the level conversion module, and the fourth signal pin 6 is electrically connected to the second terminal of the level conversion module. The first signal pin 9 serves as the second port 2022.

[0067] When the second slider forms a signal input path, it shorts the second signal pin 8 and the third signal pin 7, and shorts the fourth signal pin 6 and the fifth signal pin 5. When it forms a signal output path, it shorts the first signal pin 9 and the second signal pin 8, and shorts the third signal pin 7 and the fourth signal pin 6.

[0068] In this scheme, the second signal pin 8, the third signal pin 7, the fourth signal pin 6 and the fifth signal pin 5 constitute the first signal pin layer; the first signal pin 9, the second signal pin 8, the third signal pin 7 and the fourth signal pin 6 constitute the second signal pin layer.

[0069] In this scheme, the first signal pin 9 and the fifth signal pin 5 are shorted on the PCB board of the input / output switching switch.

[0070] In this scheme, when forming a signal input path, the first port 2021 serves as the signal input terminal and the second port 2022 serves as the signal output terminal. The second slider is placed on the first signal pin layer. The second slider short-circuits two sets of pins: one set is the second signal pin 8 and the third signal pin 7, and the other set is the fourth signal pin 6 and the fifth signal pin 5.

[0071] The signal output by the device under test is sent to the monitoring device through the first port 2021, the third signal pin 7, the second signal pin 8, the first end (signal input pin) of the level conversion module 203, the second end (signal output pin) of the level conversion module 203, the fourth signal pin 6, the fifth signal pin 5, the first signal pin 9, and the second port 2022.

[0072] When forming a signal output path, the first port 2021 serves as the signal output terminal and the second port 2022 serves as the signal input terminal. The second slider is placed on the second signal pin layer. The second slider short-circuits two sets of pins: one set is the first signal pin 9 and the second signal pin 8, and the other set is the third signal pin 7 and the fourth signal pin 6.

[0073] The signal output by the device under test is sent to the monitoring device through the second port 2022, the first signal pin 9, the second signal pin 8, the first end (signal input pin) of the level conversion module 203, the second end (signal output pin) of the level conversion module 203, the fourth signal pin 6, the third signal pin 7, and the first port 2021.

[0074] Based on any of the aforementioned schemes, in one possible implementation, the signal conversion device includes multiple cascaded signal conversion units, wherein the second port of each input / output switching switch is electrically connected when cascaded.

[0075] Figure 3 This is a block diagram of another signal conversion device in the embodiment, see reference. Figure 3 The signal conversion device may include two signal conversion units. One signal conversion unit includes a voltage switching switch 201-1, an input / output switching switch 202-1, and a level conversion module 203-1. The other signal conversion unit includes a voltage switching switch 201-2, an input / output switching switch 202-2, and a level conversion module 203-2.

[0076] The input / output switch 202-1 is configured with a first port 2021-1 and a second port 2021-2, and the input / output switch 202-2 is configured with a first port 2022-1 and a second port 2022-2. The second port 2021-2 and the second port 2022-2 are electrically connected.

[0077] In this scheme, when the first port of one signal conversion unit is used as the input and the second port as the output, the first port of another signal conversion unit is used as the output and the second port as the input. For example, the signal from the device under test is input through the first port 2021-1, and output to the monitoring equipment through the input / output switch 202-1, the level conversion module 203-1, the input / output switch 202-1, the second port 2021-2, the second port 2022-2, the input / output switch 202-2, the level conversion module 203-2, the input / output switch 202-2, and the first port 2022-1.

[0078] In this scheme, level conversion modules in different signal conversion units are used in series. Through the unidirectional level conversion of multiple level conversion modules, cross-voltage domain conversion can be achieved. For example, two unidirectional conversions can be achieved by using two level conversion modules to convert a 1.2V signal to a 3.3V signal and then to a 5V signal.

[0079] In this scheme, the power supply unit is electrically connected to an input / output switching switch through a voltage switching switch, and the target voltage of the level conversion module belonging to the same signal conversion unit is selected by the voltage switching switch.

[0080] Different level conversion modules can use the same level conversion chip design. When level conversion modules are used in series, each level conversion module is connected to a different target voltage to achieve voltage domain matching between the front-end level conversion module and the back-end level conversion module.

[0081] In this scheme, when multiple signal conversion units are used in cascade, if the second slider of the input / output switching switch of one signal conversion unit is placed on its first signal pin layer, then the second slider of the input / output switching switch of another signal conversion unit is placed on its second signal pin layer.

[0082] For example, the signal output by the device under test is input through the first port 2021-1, and then output through the third signal pin 7, the second signal pin 8 of the input / output switch 202-1, the first terminal and the second terminal of the level conversion module 203-1, the fourth signal pin 6, the fifth signal pin 5, the first signal pin 9, and the second port 2021-2 to the second port 2022-2 of the input / output switch 202-2. Finally, the signal is output through the second port 2022-2, through the first signal pin 9, the second signal pin 8 of the input / output switch 202-2, the first terminal and the second terminal of the level conversion module 203-2, the fourth signal pin 6, the third signal pin 7, and the first port 2022-1 to the monitoring device.

[0083] refer to Figure 2Based on any of the aforementioned schemes, in one possible implementation, the power supply pins include a first power supply pin 1, a second power supply pin 2, a third power supply pin 3, and a fourth power supply pin 4.

[0084] The common pin of the voltage switching switch is electrically connected to the third power supply pin 3, the first power supply pin 1 is electrically connected to the first power supply terminal of the level conversion module, the fourth power supply pin 4 is electrically connected to the second power supply terminal of the level conversion module, and the second power supply pin 2 is electrically connected to the fourth power supply pin 4.

[0085] When using a single signal conversion unit, the second slider shorts the first power supply pin 1, the second power supply pin 2, and the third power supply pin 3.

[0086] In this design, the second power supply pin 2 and the fourth power supply pin 4 can be shorted by wires outside the PCB of the input / output switching switch.

[0087] In this scheme, the power signal output by the power supply unit is output to the third power pin 3 of the input-output switching switch through the common pin of the voltage switching switch. The power signal of the third power pin 3 is input to the first power terminal of the level conversion module through the first power pin 1, and the power signal of the third power pin 3 is input to the second power terminal of the level conversion module through the second power pin 2.

[0088] In this solution, the level conversion module supports multiple voltage conversions, including 1.2V, 1.8V, 3.3V, and 5V. When using a single signal conversion unit, the input voltages at the first and second power supply terminals of the level conversion module are the same. The first power supply terminal is electrically connected to the internal power supply circuit of the level conversion module, which converts the input voltage to an internally fixed operating voltage (e.g., 3.3V). The voltage connected to the second power supply terminal serves as the target voltage (e.g., 1.2V, 1.8V, 3.3V, 5V, etc.).

[0089] refer to Figure 2 Based on the scheme of using multiple signal conversion units in cascade, in one possible implementation, the first power supply pin 1 of each input / output switching switch is electrically connected.

[0090] In this scheme, when the second slider of an input / output switch is placed on its first pin layer (forming a signal input path), its first power supply pin 1, second power supply pin 2, and third power supply pin 3 are shorted; at the same time, the second slider of another input / output switch is placed on its second pin layer (forming a signal output path), and its third power supply pin 3 and fourth power supply pin 4 are shorted.

[0091] In this scheme, the input voltage at the first power supply terminal of different level conversion modules is the same, and the input voltage is determined by the position of the voltage switching switch in the signal conversion unit where the first port serves as the signal input terminal. The input voltage at the second power supply terminal of different level conversion modules is different, and the input voltage of each level conversion module is determined by the position of its respective voltage switching switch.

[0092] refer to Figure 2 and Figure 3 For example, when the second slider of the input / output switching switch 202-1 is placed on the first pin layer, the power signal output by the power supply unit 101 is output to the third power pin 3 of the input / output switching switch 202-1 through the common pin of the voltage switching switch 201-1. The power signal of the third power pin 3 of the input / output switching switch 202-1 is input to the first power terminal of the level conversion module 203-1 through the first power pin 1 of the input / output switching switch 202-1, and is input to the first power terminal of the level conversion module 203-2 through the first power pin 1 of the input / output switching switch 202-2.

[0093] The power signal of the third power pin 3 of the input / output switching switch 202-1 is input to the second power terminal of the level conversion module 203-1 through the second power pin 2 of the input / output switching switch 202-1.

[0094] The power signal output by the power supply unit 101 is output to the third power supply pin 3 of the input / output switch 202-2 through the common pin of the voltage switching switch 201-2. The power signal of the third power supply pin 3 of the input / output switch 202-2 is input to the second power supply terminal of the level conversion module 203-2 through the fourth power supply pin 4 of the input / output switch 202-2.

[0095] Based on any of the aforementioned schemes, in one possible implementation, the level conversion module is a unidirectional level conversion module, and the output terminal of the unidirectional level conversion module is equipped with a delay circuit.

[0096] In this solution, for the debugging requirements of high-frequency signals, after the unidirectional level conversion module completes the voltage domain conversion in the specified direction, the signal input delay circuit outputs to the subsequent path after a set delay time, which can take into account the timing controllability of the output signal.

[0097] For example, in this solution, the first end of the (unidirectional) level conversion module is a signal input terminal, and the second end is a signal output terminal. The first end of the level conversion module is electrically connected to the second signal pin 8 of the input / output switching switch, and the second end of the level conversion module is electrically connected to the fourth signal pin 6 of the input / output switching switch after a delay circuit.

[0098] In this scheme, the delay circuit is used to delay the output signal of the level conversion module, thereby controlling the transmission time of the signal from the input end to the output end of the delay circuit to meet the timing requirements of different signals.

[0099] Based on any of the aforementioned schemes, in one possible implementation, the delay circuit includes an adjustable resistor and an adjustable capacitor, and the signal conversion device further includes a rheostat adjustment knob and a capacitor adjustment knob; the rheostat adjustment knob is electrically connected to the adjustable resistor, and the capacitor adjustment knob is electrically connected to the adjustable capacitor.

[0100] In this design, an RC delay circuit is used. An adjustable resistor is connected in series between the output of the (unidirectional) level conversion module and the input / output switch. One end of the adjustable capacitor is electrically connected to the input / output switch, and the other end is grounded. An ESD diode is also connected in parallel across the adjustable capacitor.

[0101] In this scheme, an adjustable resistor and an adjustable capacitor are used to form a delay circuit. By adjusting the values ​​of the adjustable resistor and the adjustable capacitor, the charging time of the adjustable capacitor is controlled, thereby achieving signal delay.

[0102] For example, in this solution, the rheostat adjustment knob can be a multi-turn potentiometer knob, and the rheostat adjustment knob is mechanically connected to the adjustment shaft of the adjustable resistor, so that the resistance value is directly changed when rotated.

[0103] The variable capacitor adjustment knob can be a rotary capacitor adjustment knob. The variable capacitor adjustment knob is mechanically connected to the adjustment shaft of the adjustable capacitor. When rotated, the distance between the capacitor plates is changed, thereby adjusting the capacitance value.

[0104] Based on any of the aforementioned schemes, in one possible implementation, the signal conversion device further includes a signal indication circuit, which is electrically connected to the first port.

[0105] In this solution, the signal indicator circuit is used to visualize the signal status of the first port of feedback, including the presence or absence of the signal and its level, which can improve the ease of use and detection efficiency of the device.

[0106] Based on any of the aforementioned schemes, in one possible implementation, the signal indicator circuit includes a switching transistor, a resistor, and a light-emitting diode. The voltage switching switch also includes a power input pin and a power output pin for the indicator circuit.

[0107] The power output pin of the indicator circuit is electrically connected to the first terminal of the switching transistor through a resistor and a light-emitting diode. The second terminal of the switching transistor is grounded, and the control terminal of the switching transistor is electrically connected to the first port. The power input pin of the indicator circuit is electrically connected to the power supply unit. The first slider is also used to connect the power input pin and the power output pin of the indicator circuit.

[0108] In this scheme, the power supply provides power to the signal indicator circuit through a voltage switching switch. The presence or absence of the signal and its level at the first port are used to control the on / off state of the switch, thereby controlling whether the light-emitting diode emits light.

[0109] In this scheme, when the first slider of the voltage switching switch selects a certain voltage level, the first slider simultaneously connects the power input pin and the power output pin of the indicator circuit to supply power to the indicator circuit.

[0110] When the signal at the first port is high, the switching transistor is turned on. At this time, the power supply circuit of the LED is connected, and the current flows from the power output pin of the indicator circuit through the resistor, the LED, and the switching transistor to ground, and the LED lights up.

[0111] When there is no signal or the signal is low at the first port, the switching transistor is turned off, the power supply circuit of the LED is cut off, and the LED turns off.

[0112] Based on any of the aforementioned schemes, in one possible implementation, the power supply unit includes multiple linear regulators arranged in series, with the output terminal of one linear regulator electrically connected to a power input pin.

[0113] In this solution, a cascaded architecture of multiple linear regulators (LDOs) is adopted, with the output of each LDO directly corresponding to a power input pin of the voltage switching switch. Through the cascading of LDOs, a single external power supply can generate stable output voltages at multiple levels (such as 1.2V, 1.8V, 3.3V, and 5V), providing precise multi-level power supply for the signal conversion unit.

[0114] In this solution, the input terminal of the external power supply can be configured with a reverse connection protection diode, a TVS diode, and an LED. The reverse connection protection diode and TVS diode are used for power supply protection, and the LED is used to indicate the operating status of the power supply.

[0115] In this design, the external 5V power supply is stepped down to 3.3V by the first-stage LDO, then to 1.8V by the second-stage LDO, and finally to 1.2V by the third-stage LDO. Each LDO only processes the voltage difference between the output of the preceding stage and its own output. When the first slider of the voltage switching switch selects a certain range, only the LDO output corresponding to that range is connected to the signal conversion unit.

[0116] Based on any of the aforementioned schemes, in one possible implementation, a reverse connection protection diode is also configured in the signal path formed between the first port, the second port, and the level conversion module.

[0117] In this scheme, the cathode of the reverse connection protection diode is electrically connected to the pin or port in the signal input direction, and the anode is electrically connected to the pin or port in the signal output direction. The reverse connection protection diode is used to prevent external signals and reverse high voltage or reverse level from damaging the internal circuit.

[0118] For example, in this solution, the level conversion module is a unidirectional level conversion module. The signal input terminal of the level conversion module is configured to be electrically connected to the anode of a reverse connection protection diode, and the cathode of the reverse connection protection diode is electrically connected to a designated pin (e.g., the second signal pin) of the input / output switching switch. The signal output terminal of the level conversion module is configured to be electrically connected to the cathode of a reverse connection protection diode, and the anode of the reverse connection protection diode is electrically connected to a designated pin (e.g., the fourth signal pin) of the input / output switching switch.

[0119] In this scheme, a reverse connection protection diode can be configured between the power supply pin of the input / output switching switch and the power supply terminal of the level conversion module. The anode of the reverse connection protection diode is electrically connected to the power supply pin of the input / output switching switch, and the cathode is electrically connected to the power supply terminal of the level conversion module. The reverse connection protection diode is used to prevent power backflow.

[0120] Figure 4 This is a schematic diagram of the signal conversion device in the embodiment. Figure 5 This is a schematic diagram of the voltage switching switch pins in the embodiment. Figure 6 This is a schematic diagram of the signal conversion device in the embodiment, for reference. Figure 2 , 4 ~6. Based on any of the aforementioned schemes, in one possible implementation, the signal conversion device includes nine signal conversion units and one power supply unit.

[0121] The power supply unit includes 3.3V LDO, 1.8V LDO, and 1.2V LDO, which are connected in series. The power supply is electrically connected to the input terminal of the 3.3V LDO. The output terminals of the 3.3V LDO, 1.8V LDO, and 1.2V LDO are electrically connected to the power input pins 1 to 3 of the first voltage switching switch SV1, respectively. The power input pins 1, 2, 3, and 4 of the voltage switching switches SV1 to SV9 are shorted to each other.

[0122] The first power supply pin 1 of input / output switches SD1~SD9 is shorted to each other. The first signal pin 9 of input / output switches SD1~SD9 is shorted to each other.

[0123] The first signal conversion unit includes a first voltage switching switch SV1, a first input / output switching switch SD1, a first level conversion module LS1, a first terminal P1, a first light-emitting diode LED1, a first switching transistor T1, a first adjustable resistor R1, a first adjustable capacitor C1, and a first ESD diode D1.

[0124] The power supply is electrically connected to the power input pins 7~10 and power input pin 4 of the first voltage switching switch SV1. The common pin 6 of the first voltage switching switch SV1 is electrically connected to the first terminal of the first switching transistor T1 through the current limiting resistor and the first light-emitting diode LED1. The second terminal of the first switching transistor T1 is grounded. The control terminal of the first switching transistor T1 is electrically connected to the first terminal P1.

[0125] The common pin 5 of the first voltage switching switch SV1 is electrically connected to the third power supply pin 3 of the first input / output switching switch SD1. The first power supply pin 1 of SD1 is electrically connected to the first power supply terminal of the first level conversion module LS1 through an anti-reverse diode. The fourth power supply pin 4 of SD1 is electrically connected to the second power supply terminal of LS1. The second power supply pin 2 of SD1 is electrically connected to the fourth power supply pin 4.

[0126] The first terminal P1 is electrically connected to the third signal pin 7 of the first input / output switching switch SD1. The second signal pin 8 is electrically connected to the first terminal of LS1 through the anti-reverse diode. The first terminal of LS1 is electrically connected to the fourth signal pin 6 of LS1 through the first adjustable resistor R1 and the anti-reverse diode.

[0127] The current-limiting resistor, the first light-emitting diode LED1, and the first switching transistor T1 constitute the first signal indication circuit of the first signal conversion unit. The first signal indication circuit is used to indicate the high or low level state of the first terminal P1. The first adjustable resistor R1, the first adjustable capacitor C1, and the first ESD diode D1 constitute the first delay circuit of the first signal conversion unit. The first delay circuit is used to delay the output signal of LS1.

[0128] In this scheme, the i-th signal conversion unit includes the i-th voltage switching switch SVj, the i-th input / output switching switch SDj, the i-th level conversion module LSj, the i-th terminal Pj, the i-th light-emitting diode LEDj, the i-th switching transistor Tj, the i-th adjustable resistor Rj, the i-th adjustable capacitor Cj, and the i-th ESD diode Dj. i is from one to nine, and j corresponds to i from 1 to 9. The structures of different signal conversion units are the same. The specific structures and connection methods of signal conversion units two to nine will not be described in detail.

[0129] In this scheme, the input power supply of the i-th level conversion module LSi is selected by the i-th voltage switching switch SVi, the value of Ri is adjusted by the variable resistor adjustment knob configured by the i-th adjustable resistor Ri, and the value of Ci is adjusted by the variable capacitor adjustment knob configured by the i-th adjustable capacitor Ci.

[0130] Table 1 is a table showing the input / output state switching of the input / output switch. You can refer to Table 1 for instructions on how to use the input / output switch.

[0131]

[0132] Table 2 is a table showing the voltage switching status of the voltage changeover switch. You can refer to Table 2 for instructions on how to use the voltage changeover switch.

[0133]

[0134] In this solution, terminal Pi can be connected to the device under test or the monitoring device. When one terminal is used for signal input to the device under test, the other terminal is selected to output signals to the monitoring device.

[0135] For example, when the first terminal P1 is selected for signal input, the ninth terminal P9 is selected for signal output. The signal output by the device under test is input through the first terminal P1, passes through the third signal pin 7, the second signal pin 8 of the first input / output switch SD1, the first and second terminals of the first level conversion module LS1, the first delay circuit, the fourth signal pin 6, the fifth signal pin 5, and the first signal pin 9, and is output to the first signal pin 9 of the second input / output switch SD2. Subsequently, it is output to the monitoring device through the second signal pin 8 of SD2, the first and second terminals of the second level conversion module LS2, the second delay circuit, the fourth signal pin 6, the third signal pin 7, and the ninth terminal P9.

[0136] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A signal conversion device, characterized in that, It includes a power supply unit and multiple signal conversion units, with the multiple signal conversion units cascaded together, and the power supply unit is electrically connected to the multiple signal conversion units; One of the signal conversion units includes a terminal block, an input / output switch, and a level conversion module; Each of the input / output switching switches includes a first signal pin layer and a second signal pin layer. When the first signal pin layer is connected, a signal input path is formed between the terminal and the level conversion module; when the second signal pin layer is connected, a signal output path is formed between the level conversion module and the terminal. When the first signal pin layer of at least one signal conversion unit is connected, the terminal of the signal conversion unit is used for signal input. At this time, the second signal pin layer of at least another signal conversion unit is set to be connected, and the terminal of the signal conversion unit is used for signal output.

2. The signal conversion device as described in claim 1, characterized in that, One of the signal conversion units further includes a voltage switching switch; The power supply unit includes multiple outputs, and a voltage switching switch includes several power input pins and a common pin. One output of the power supply unit is electrically connected to one of the power input pins. The voltage switching switch is equipped with a first slider, which is used to connect one of the power input pins to the common pin. The input / output switching switch includes a power supply pin, the common pin is electrically connected to the power supply pin, and the power supply pin is electrically connected to the power supply terminal of the level conversion module.

3. The signal conversion device as described in claim 1, characterized in that, The input / output switching switch also includes a second slider, a first port, and a second port; When the second slider is connected to the first signal pin layer, the terminal block, the first port, the second port and the level conversion module form a signal input path; when connected to the second signal pin layer, the terminal block, the first port, the second port and the level conversion module form a signal output path. When cascaded, the second port of each of the input / output switching switches is electrically connected.

4. The signal conversion device as described in claim 3, characterized in that, The input / output switching switch includes a first signal pin, a second signal pin, a third signal pin, a fourth signal pin, and a fifth signal pin, wherein the first signal pin and the fifth signal pin are electrically connected. The first port is electrically connected to the third signal pin, the second signal pin is electrically connected to the first terminal of the level conversion module, and the fourth signal pin is electrically connected to the second terminal of the level conversion module; The first signal pin of each of the input / output switching switches is electrically connected, and the first signal pin serves as the second port; When the second slider forms the signal input path, it shorts the second signal pin, the third signal pin, and the fourth signal pin and the fifth signal pin. When it forms the signal output path, it shorts the first signal pin, the second signal pin, and the third signal pin and the fourth signal pin.

5. The signal conversion device as described in claim 2, characterized in that, The power supply pins include a first power supply pin, a second power supply pin, a third power supply pin, and a fourth power supply pin, with the first power supply pin of each input / output switch being electrically connected. The common pin is electrically connected to the third power pin, the first power pin is electrically connected to the first power terminal of the level conversion module, the fourth power pin is electrically connected to the second power terminal of the level conversion module, and the second power pin is electrically connected to the fourth power pin. When the signal input path is formed, the first power supply pin, the second power supply pin, and the third power supply pin are shorted. When the signal output path is formed, the third power supply pin and the fourth power supply pin are shorted.

6. The signal conversion device according to any one of claims 1 to 5, characterized in that, The level conversion module is a unidirectional level conversion module, and the output terminal of the unidirectional level conversion module is equipped with a delay circuit.

7. The signal conversion device as described in claim 6, characterized in that, The delay circuit includes an adjustable resistor and an adjustable capacitor, and the signal conversion device also includes a variable resistor adjustment knob and a variable capacitor adjustment knob. The variable resistor adjustment knob is electrically connected to the adjustable resistor, and the variable capacitor adjustment knob is electrically connected to the adjustable capacitor.

8. The signal conversion device according to any one of claims 1 to 5, characterized in that, The signal conversion device further includes a signal indicating circuit, which is electrically connected to the first port.

9. The signal conversion device as described in claim 8, characterized in that, The signal indication circuit includes a switching transistor, a resistor, and a light-emitting diode. The voltage switching switch also includes a power input pin and a power output pin for the indication circuit. The power output pin of the indicator circuit is electrically connected to the first terminal of the switching transistor through the resistor and the light-emitting diode. The second terminal of the switching transistor is grounded, and the control terminal of the switching transistor is electrically connected to the first port. The power input pin of the indicator circuit is electrically connected to the power supply unit, and the first slider is also used to connect the power input pin of the indicator circuit and the power output pin of the indicator circuit.

10. The signal conversion device according to any one of claims 1 to 5, characterized in that, The power supply unit includes multiple linear regulators connected in series, and the output terminal of one of the linear regulators is electrically connected to one of the power input pins.

11. The signal conversion device according to any one of claims 1 to 5, characterized in that, The signal path formed between the first port, the second port, and the level conversion module is also equipped with a reverse connection protection diode.

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