Codable outer timing system signal generation circuit and tool

Abstract

The utility model discloses a coding outer timing system signal generation circuit and a tool, the coding outer timing system tool comprises a coding outer timing system signal generation circuit, the exterior of the coding outer timing system signal generation circuit is provided with a housing, and the housing is provided with a display screen, a regulation and control button and a circuit port connector; the encodable outer timing signal generation circuit comprises an external signal input circuit, an encodable chip circuit, a signal modulation circuit and a power supply circuit, the power supply circuit is connected with an external power supply to supply power to the whole circuit, and an external signal is input to an encodable chip through the external signal input circuit; the coding chip respectively outputs a differential modulation signal and a first single-ended modulation signal to the signal modulation circuit, and finally the signal modulation circuit outputs a standard differential signal and a single-ended signal. According to the utility model, the authenticity of a signal source simulation test signal is improved, and compared with a common signal generator, the signal generator has a larger pulse width modulation range, is more convenient to carry, has a clearer operation interface, and is lower in cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electronic equipment technical field, concretely relates to a kind of codeable external time signal generation circuit and tooling. BACKGROUND

[0002] When testing, researching or adjusting electronic circuit and equipment, in order to determine some electrical parameters of the circuit, the signal source needs to provide test signals meeting specific technical conditions to simulate the external time signal of the device under test used in actual work. The most widely demanded external time signal currently includes single-ended signal and differential signal. In the prior art, the signal source used to simulate external time signal is generally a common signal generator on the market.

[0003] In the common signal generator on the market, some signal generators cannot output coded signals, which cannot meet the signal coding demand in actual use. Some signal generators cannot output differential signals, but can only simulate pseudo-differential signals by changing the reference ground, which cannot meet the demand of outputting standard differential signals in testing, and may cause inaccurate test results.

[0004] The signal source of the prior art is difficult to comprehensively solve the above defects, and the signal source meeting multiple functional demands at the same time generally has the shortcomings of large size, large weight, great operation difficulty and high price. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of codeable external time signal generation circuit and tooling for providing external time signal for device under test to meet the testing demand of multiple devices in view of the deficiencies of the prior art.

[0006] The utility model achieves the purpose by the following technical scheme:

[0007] The utility model provides a kind of codeable external time signal generation circuit, including external signal input circuit, codeable chip circuit, signal modulation circuit and power supply circuit, external signal is input to codeable chip by external signal input circuit, codeable chip respectively outputs differential modulation signal and first single-ended modulation signal to signal modulation circuit, and finally signal modulation circuit outputs standard differential signal and single-ended signal;

[0008] External signal input circuit is used to process external input signal into signal meeting the input requirement of codeable chip, and the structure is as follows: the positive pole of external input signal is respectively connected with first capacitor, one end of second resistor and the positive pole of input end of first optocoupler, the negative pole of external input signal is respectively connected with first capacitor, the other end of second resistor and the negative pole of input end of first optocoupler, the output end C pole of first optocoupler is grounded, the output end E pole of first optocoupler is connected with power supply and inputs signal TTL in meeting the input requirement of codeable chip into codeable chip.

[0009] The signal modulation circuit is used for generating standard differential signals and single-end signals, and has the following structure: the codeable chip outputs differential modulation signals, and the differential chip outputs differential signals; the codeable chip outputs first single-end modulation signals, and the first single-end modulation signals are connected to one end of a third resistor through a driving switch chip; the other end of the third resistor is connected to one end of a fourth resistor and a positive electrode of an input end of a second optocoupler respectively; the other end of the fourth resistor is connected to a negative electrode of the input end of the second optocoupler and grounded; a C electrode of an output end of the second optocoupler is connected to GISO; second single-end modulation signals output by the differential chip are connected to an E electrode of an output end of the second optocoupler through a fifth resistor; and single-end signals are output from two ends of the fifth resistor.

[0010] The power supply circuit comprises a plurality of power supply voltage reduction modules, which are used for stably reducing external power supply to direct current power supply required by the circuit to supply power to the whole circuit.

[0011] Further, the signal modulation circuit is provided with a plurality of differential chips, and a plurality of first single-end modulation signals output by the codeable chip are output as a plurality of single-end signals through the same driving switch chip.

[0012] Further, a plurality of signal modulation circuits are provided.

[0013] Further, the codeable chip is a single-chip microcomputer or an FPGA chip.

[0014] The utility model discloses a kind of coding external time signal signal generation circuits and tooling, including above-mentioned coding external time signal signal generation circuit, the shell is equipped with in the external coding external time signal signal generation circuit, the shell is equipped with display screen, control button and circuit port connector, the control circuit of control button and the display screen are accessed in the coding external time signal signal generation circuit, control button is used to select the function mode of coding external time signal tooling and set output signal parameter, display is used to assist selection the function mode of coding external time signal tooling and set output signal parameter.

[0015] Compared with the prior art, the utility model discloses a kind of circuit design structures, with the following beneficial effects:

[0016] The utility model provides a kind of coding external time signal signal generation circuit and tooling, can generate standard differential signals, single-end signals, improve the authenticity of signal source analog test signal, simultaneously, function extension is carried out, still have signal coding function, each output signal linkage function on the basis of generating signal, compared with ordinary signal generator, still have greater pulse width modulation range, and more convenient to carry, operation interface is more clear, and cost is lower. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0018] Figure 1 The whole structure schematic diagram of the coded external time system tooling of the present application;

[0019] Figure 2 The structure schematic diagram of the external input circuit of the embodiment of the present application;

[0020] Figure 3 The schematic diagram of the coded chip of the embodiment of the present application;

[0021] Figure 4 The structure schematic diagram of the signal modulation circuit of the embodiment of the present application;

[0022] Figure 5 The structure schematic diagram of the power supply circuit of the embodiment of the present application;

[0023] Figure 6 The structure schematic diagram of the external control button circuit of the embodiment of the present application. DETAILED DESCRIPTION

[0024] The exemplary embodiments of the present application will be described in detail with reference to the drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] The present application discloses an embodiment of a coded external time system tooling, as shown in Figure 1 The present application discloses an embodiment of a coded external time system tooling, as shown in

[0026] The embodiment can realize the differential signal output function and the single-ended signal output function in the external trigger mode. Specifically, four-way signal output functions are integrated on the circuit board of the external signal generation circuit, two of which are single-ended signal outputs and two of which are differential signal outputs. The single-ended signal is generated by a programmable chip (single-chip microcomputer or FPGA) to generate a first-level modulation signal, and the first-level modulation signal controls the on-off of the external input signal through a driving switch device, thereby realizing the output of the single-ended signal. The differential signal is generated by a programmable chip to generate a first-level modulation signal, and the first-level modulation signal is modulated by a differential chip to output a differential signal. The external signal generation circuit includes an external signal input circuit, a programmable chip, a signal modulation circuit, an external control circuit, and a power supply circuit.

[0027] The external signal input circuit includes an isolation circuit, which supports the input of differential or single-ended signals with any parameters. After the external input signal is processed by the isolation circuit, it is converted into a signal that meets the input requirements of the programmable chip. The specific structure is shown in Figure 2 The external signal is input through port XS8, the positive electrode is connected to C26 through resistor R23, one end of resistor R24, and the positive electrode of optocoupler N4, the negative electrode is connected to capacitor C26, the other end of resistor R24, and the negative electrode of optocoupler N4, the C electrode of optocoupler N4 is grounded, the +3.3V power supply provided by the power supply circuit is connected to the positive electrode of light-emitting diode D9, the negative electrode of D9 is connected to the E electrode of optocoupler N4 through resistor R22 and inputs the processed signal TTL-in to the programmable chip.

[0028] The internal signal generation is based on a single-chip microcomputer to generate a first-level modulation signal, which can include differential modulation signals and single-ended modulation signals. The single-chip microcomputer chip U1 in this embodiment is GD32F303CGT6, and the circuit is shown in Figure 3 The chip U1 is connected to the crystal oscillator G1, and the TTL-in signal is input through pin 22. The programmable chip has a signal parameter setting program recorded inside. In the external trigger mode, after the programmable chip receives the TTL-in signal, it processes it through the software program and outputs a first-level modulation signal with a specific frequency and amplitude. The first-level modulation signal includes first single-ended modulation signals signal1 and signal2 output by chip pins 16 and 17, and differential modulation signals USART0 TXD and USART0 RXD output by chip pins 30 and 31. The above-mentioned first-level modulation signal is transmitted to the signal modulation circuit.

[0029] Figure 4For the signal modulation circuit diagram, the circuit includes differential modulation circuit and single-ended modulation circuit, wherein the differential modulation circuit uses differential chip to convert differential modulation signal into two-way standard differential signal, which is output by the connector XS3 and XS5 respectively. The standard differential signal can be provided to the device under test. Specifically, the differential modulation signal USART0 TXD output by the pin 30 of the programmable chip U1 is connected to the differential chip U2 through the resistor R10 and the light emitting diode D5, the pin 8 and the pin 9 of the chip U2 output the differential signals 2T_N and 2T_P to the connector XS3, and the pin 12 of the chip U2 outputs the second single-ended modulation signal TTL1out+. The differential modulation signal USART0 RXD output by the pin 31 of the chip U1 is connected to the differential chip U3 through the resistor R11 and the light emitting diode D6, the pin 8 and the pin 9 of the chip U3 output the differential signals 1T_N and 1T_P to the connector XS5, and the pin 12 of the chip U3 outputs the second single-ended modulation signal TTL2out+.

[0030] The single-ended modulation signal circuit generates control signals by driving the switching chip and the optocoupler, and controls the second single-ended modulation signal from the differential chip to form the required single-ended signal. Specifically, the first single-ended modulation signal output by the pins 16 and 17 of the programmable chip U1 is transmitted to the driving switching chip U4, wherein the model of the driving switching chip U4 is EG27324. The signal output by the pin 7 of the chip U4 is connected to the positive electrode of the input end of the resistor R18 and the input end of the optocoupler N2 through the resistor R15, the other end of the resistor R18 is connected to the negative electrode of the input end of the optocoupler N2 and grounded, the C pole of the optocoupler N2 is connected to GISO1, the second single-ended modulation signal TTL1out+ output by the chip U2 is connected to the positive electrode of the light emitting diode D7, the negative electrode of D7 is connected to the output end E pole of the optocoupler N2 through the resistor R14 and outputs TTL1 out-, and TTL1 out+ and TTL1out- are output to the port of the connector XS6; the signal output by the pin 5 of the chip U4 is connected to the positive electrode of the optocoupler N3 through the resistor R20 and the resistor R21, the other end of the resistor R21 is connected to the negative electrode of the optocoupler N3 and grounded, the C pole of the optocoupler N3 is connected to GISO2, TTL2out+ output by the chip U3 is connected to the positive electrode of the light emitting diode D8, the negative electrode of D8 is connected to the output end E pole of the optocoupler N3 through the resistor R19 and outputs TTL2out-, and TTL2out+ and TTL2out- are output to the port of the connector XS7.

[0031] Figure 5 For the power supply circuit of the embodiment, the power supply circuit takes each group of voltage dividing power module as the core to reduce the external power supply to the required DC power supply of the circuit. The external power supply is input through the port of the connector XS1, and outputs +12V power supply after the voltage dividing power module N1, outputs +5V power supply after the power supply module V1, and outputs +3.3V power supply after the power supply module V2.

[0032] The external control circuit comprises a key and a display screen, and the functions are integrated into the circuit board to realize display, key input and other functions. Figure 6 For the key circuit in the external control circuit of the embodiment, the display screen supports SPI communication or serial communication, and the key and the display screen circuit are connected to the programmable chip to realize function mode selection and output signal parameter setting by cooperating with the software program in the programmable chip. The user combines the text prompt on the display screen and operates by using the key. The function mode can include an external trigger mode and an internal trigger mode, which are realized by inputting corresponding software programs in the programmable chip. In the external trigger mode described above, the pulse width of the output signal is consistent with the external input signal, and the frequency and amplitude can be set and adjusted by the key and the display screen. It can be seen that as long as an external trigger signal with arbitrary parameters is provided, the domestic signal and the differential signal with frequency and amplitude meeting the specific use requirements can be output.

[0033] In the internal trigger mode, no external input signal is needed, and the programmable chip directly generates a first-level modulation signal according to the set signal parameters to generate a differential signal and a single-ended signal, wherein the frequency, amplitude and pulse width of the differential signal and the single-ended signal are set by the key. Based on the programmable chip, more functions such as signal coding, pulse width modulation and linkage of each output signal can be realized.

[0034] The embodiment increases a light-emitting diode and a series resistor for detecting whether each part of the circuit is smooth on the basis of the original circuit.

[0035] The utility model can produce single-ended signal and standard differential signal, improve the authenticity of test signal, still have coding function, each output signal linkage function, greater pulse width modulation range, can satisfy more test demand, therefore, the utility model has wider application range. In addition, compared with prior art, the utility model has smaller volume and weight, is more convenient to carry, and has clearer operation interface and lower manufacturing cost.

[0036] The utility model is described in detail through the above examples, but the content is only the exemplary embodiment of the utility model and cannot be considered to limit the implementation range of the utility model. The protection scope of the utility model is defined by the claims. Any technical scheme utilizing the technical scheme of the utility model or inspired by the technical scheme of the utility model within the essence and protection scope of the utility model, any equal change and improvement to the application scope, etc. should still belong to the patent coverage protection scope of the utility model. It should be noted that, in order to clearly express, the description of the utility model omits the expression of some components and processing known to the person skilled in the art which is not directly and obviously related to the protection scope of the utility model.

Claims

1. A circuit for generating coded external time synchronization signals, characterized in that, It includes an external signal input circuit, an coded chip circuit, a signal modulation circuit, and a power supply circuit. The external signal is input to the coded chip through the external signal input circuit. The coded chip outputs a differential modulation signal and a first single-ended modulation signal to the signal modulation circuit. Finally, the signal modulation circuit outputs a standard differential signal and a single-ended signal. The external signal input circuit is used to process the external input signal into a signal that meets the input requirements of the coded chip. The structure is as follows: the positive terminal of the external input signal is connected to the positive terminal of the first capacitor, one end of the second resistor and the input terminal of the first optocoupler via the first resistor; the negative terminal of the external input signal is connected to the other end of the first capacitor and the second resistor and the input terminal of the first optocoupler; the C terminal of the first optocoupler is grounded; the E terminal of the first optocoupler is connected to the power supply and inputs the signal TTL in that meets the input requirements of the coded chip to the coded chip. The signal modulation circuit is used to generate standard differential signals and single-ended signals. The structure is as follows: the encoder chip outputs a differential modulation signal, which is then output as a differential signal via a differential chip; the encoder chip outputs a first single-ended modulation signal, which is connected to one end of a third resistor via a driver switch chip; the other end of the third resistor is connected to one end of a fourth resistor and the positive terminal of the input of a second optocoupler; the other end of the fourth resistor is connected to the negative terminal of the input of the second optocoupler and grounded; the C terminal of the output of the second optocoupler is connected to GISO; the second single-ended modulation signal output by the differential chip is connected to the E terminal of the output of the second optocoupler via a fifth resistor; and a single-ended signal is output from both ends of the fifth resistor. The power supply circuit includes multiple power step-down modules, which are used to stably step down the external power supply to the DC power required by the circuit to power the entire circuit.

2. The coded external timing signal generation circuit according to claim 1, characterized in that, The signal modulation circuit is equipped with multiple differential chips, and the multiple first single-ended modulated signals output by the encoding chip are output as multiple single-ended signals through the same driving switch chip.

3. The coded external time synchronization signal generation circuit according to claim 1, characterized in that, Multiple sets of the aforementioned signal modulation circuits are configured.

4. The encodeable external timing signal generation circuit according to claim 1, characterized in that, The coded chip can be a microcontroller or an FPGA chip.

5. A codeable external timing system tooling, characterized in that, The circuit includes a coded external time synchronization signal generation circuit as described in any one of claims 1-3. The coded external time synchronization signal generation circuit is provided with an outer casing. The outer casing is provided with a display screen, control buttons, and circuit port connectors. The control circuit of the control buttons and the display screen are connected to the coded external time synchronization signal generation circuit. The control buttons are used to select the function mode of the coded external time synchronization fixture and set the output signal parameters. The display screen is used to assist in selecting the function mode of the coded external time synchronization fixture and setting the output signal parameters.

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