Mining analog signal isolator based on linear optoelectronic isolation

Abstract

The utility model belongs to the technical field of mining analog signal isolators. The utility model provides a mining analog signal isolator based on linear optoelectronic isolation, which comprises a first operational amplifier, a linear optoelectronic isolation device, a second operational amplifier and an isolated direct current / direct current power converter, the first operational amplifier is connected with the linear photoelectric isolation device, and the linear photoelectric isolation device is connected with the second operational amplifier; one end of the isolated DC / DC power converter is used for being connected with a safety power supply, and the safety power supply is connected with the second operational amplifier to provide a working power supply for an internal circuit of the output stage; the other end of the isolated DC / DC power converter is connected with the first operational amplifier so as to provide a working power supply for an internal circuit of the input stage; according to the invention, the requirement of the advanced prediction technology on rapid change signal isolation in the mining explosion-proof environment is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of mine analog signal isolator, especially in linear photoelectric isolation based on mine analog signal isolator. BACKGROUND

[0002] The statements in this section merely provide background information related to the utility model and do not necessarily constitute the prior art.

[0003] At present, in the mine place, especially in the temperature sensor, humidity sensor, gas concentration sensor, harmful gas concentration sensor or other specific function sensor used in the explosion-proof environment, the output signal needs to be transmitted into the non-intrinsically safe signal acquisition system after passing through the signal isolation device, and the common characteristics of these signals are low change rate, response time of several milliseconds to several tens of milliseconds, which is equivalent to signal bandwidth of several hertz to several hundred hertz, so that the signal isolation device is a narrowband signal isolation device (or low-speed signal isolation device).

[0004] With the automatic mining device used for mining, the abnormal body needs to be forecasted in the tunneling direction, and the result of the advanced forecast provides technical support for the safe mining of the automatic mining device, and the bandwidth of the sensor signal required in the advanced forecast technology can reach 2000Hz-4000Hz or higher signal bandwidth, and the existing narrowband or low-frequency signal isolation device cannot meet the demand of the advanced forecast technology. UTILITY MODEL CONTENT

[0005] In order to solve the shortage of prior art, the utility model provides a kind of mine analog signal isolator based on linear photoelectric isolation, with greater than 100KHz signal bandwidth, analog signal linearity is better than 0.01%, the insulation strength between the input, output and power supply of analog signal isolator can reach 3000V, meet the requirement of fast change signal isolation in mine explosion-proof environment in advanced forecast technology.

[0006] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A kind of mine analog signal isolator based on linear photoelectric isolation, comprising: first operational amplifier, linear photoelectric isolator, second operational amplifier, isolation DC / DC power converter, the first operational amplifier is used to receive analog input signal, the first operational amplifier is connected with the linear photoelectric isolator, the linear photoelectric isolator is connected with the second operational amplifier;

[0008] One end of the isolation DC / DC power converter is used for connecting with a safety power supply, the safety power supply is connected with the second operational amplifier to provide working power supply for internal circuit of an output stage, and the other end of the isolation DC / DC power converter is connected with the first operational amplifier to provide working power supply for internal circuit of an input stage.

[0009] As a further limitation of the utility model, the linear photoelectric isolation device includes a source edge phototransistor of an input stage, a source edge light emitting diode of the input stage and a secondary edge phototransistor of an output stage.

[0010] As a further limitation of the utility model, the analog signal conversion mode adopts a same phase signal input isolation mode, the first operational amplifier receives an analog input signal at a same phase input end, and the first operational amplifier is connected with the first end of a second resistance, the base of the source edge phototransistor and the first end of the first resistance at an inverse phase input end respectively, and the output end of the first operational amplifier is connected with the first end of a second resistance and the second end of a capacitor respectively.

[0011] The second end of the first resistance is connected with the first operational amplifier and grounded, the output power supply of the isolation DC / DC power converter is connected with the first operational amplifier, the output power supply of the isolation DC / DC power converter is connected with the collector of the source edge phototransistor, the second end of the second resistance is connected with the positive end of the source edge light emitting diode, and the negative end of the source edge light emitting diode is grounded.

[0012] As a further limitation of the utility model, the analog input signal is input by the same phase end of the first operational amplifier, the output of the first operational amplifier drives the source edge light emitting diode in the linear photoelectric isolation device after current limiting by the second resistance, the source edge phototransistor inducts the change of the light intensity of the source edge light emitting diode by photoelectric effect, the output power supply of the isolation DC / DC power converter is fed back to the inverse phase input end of the first operational amplifier through the equivalent variable resistance of the source edge phototransistor and the first resistance to form a negative feedback loop, and the capacitor compensates the phase of the feedback loop.

[0013] As a further limitation of the utility model, the safety power supply is connected with the collector of the secondary edge phototransistor, the base of the secondary edge phototransistor is connected with the first section of a third resistance and the same phase input end of the second operational amplifier respectively, the second end of the third resistance is connected with the second operational amplifier and grounded, the safety power supply is connected with the second operational amplifier, the inverse phase input end of the second operational amplifier is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier outputs an analog signal.

[0014] As a further limitation of the utility model, the secondary edge phototransistor inducts the change of the light emitting intensity of the source edge light emitting diode by photoelectric effect, the safety power supply is input to the noninverting input terminal of the second operational amplifier through the equivalent variable resistor of the secondary edge phototransistor and the third resistor, and outputs analog signal after buffering through the second operational amplifier.

[0015] As a further limitation of the utility model, the analog signal conversion mode adopts inverse signal input isolation mode, the noninverting input terminal of the first operational amplifier is grounded, the noninverting input terminal of the first operational amplifier is connected with the second end of the first resistor, the first end of the capacitor and the collector of the source edge phototransistor respectively, the base of the source edge phototransistor is grounded, the first end of the first resistor is used for receiving analog input signal, the second end of the capacitor is connected with the output terminal of the first operational amplifier, the output terminal of the first operational amplifier is connected with the negative terminal of the source edge light emitting diode, the positive terminal of the source edge light emitting diode is connected with the first end of the second resistor, and the second end of the second resistor is connected with the output power supply of the isolation DC / DC power converter.

[0016] As a further limitation of the utility model, the analog input signal is transmitted to the inverting input terminal of the first operational amplifier through the first resistor, the output of the first operational amplifier drives the internal source edge light emitting diode of the linear photoelectric isolator through the second resistor and the output power supply of the isolation DC / DC power converter, the source edge phototransistor inducts the change of the light emitting intensity of the source edge light emitting diode by photoelectric effect, the equivalent variable resistor, the first resistor and the first operational amplifier constitute an inverting amplifier, and the capacitor compensates the phase of feedback loop.

[0017] As a further limitation of the utility model, the noninverting input terminal of the second operational amplifier is grounded and connected with the base of the secondary edge phototransistor, the inverting input terminal of the second operational amplifier is connected with the collector of the secondary edge phototransistor and the first end of the third resistor respectively, and the second end of the third resistor is connected with the output terminal of the second operational amplifier.

[0018] As a further limitation of the utility model, the secondary edge phototransistor inducts the change of the light emitting intensity of the source edge light emitting diode by photoelectric effect, the equivalent variable resistor, the third feedback resistor and the second operational amplifier constitute an inverting amplifier, and the inverting amplifier outputs analog signal.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] The utility model innovatively provides a kind of mining analog signal isolator based on linear photoelectric isolation, with the signal bandwidth of more than 100KHz, analog signal linearity is superior to 0.01%, the insulation strength between input, output and power supply of analog signal isolator can reach 3000V, meet the requirement of advanced prediction technology to fast change signal isolation in mine explosion-proof environment.

[0021] The advantages of the additional aspects of the utility model will be partially given in the following description, some will become apparent from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings accompanying the specification of the utility model form part of the utility model and are included to provide further understanding of the utility model, and the illustrative embodiments of the utility model and their description serve to explain the utility model, and do not constitute improper limitation to the utility model.

[0023] Figure 1 The schematic diagram of the mining analog signal isolator based on linear photoelectric isolation provided by the utility model is shown in the figure;

[0024] Figure 2 The schematic diagram of the in-phase signal input isolation mode provided by the utility model is shown in the figure;

[0025] Figure 3 The schematic diagram of the anti-phase signal input isolation mode provided by the utility model is shown in the figure. DETAILED DESCRIPTION

[0026] The utility model will be further described below in combination with drawings and embodiments.

[0027] It should be pointed out that the following detailed description is all exemplary, and aims at providing further explanation to the utility model. Unless otherwise specified, all technical and scientific terms used in this paper have the same meaning as that generally understood by ordinary skilled person in the technical field to which the utility model belongs.

[0028] In the implementation mode, a kind of mining analog signal isolator based on linear photoelectric isolation is proposed, suitable for the application scene of fast signal response speed, simultaneously compatible with the occasion of low response speed demand, signal frequency response range DC-100KHz, in the entire bandwidth range, ensure that analog signal linearity is superior to 0.01%.

[0029] Specifically, as Figure 1As shown, the mine analog signal isolator comprises a first operational amplifier A1, a linear photoelectric isolation device L1, a second operational amplifier A2 and an isolated DC / DC power converter P1, the first operational amplifier A1 is used for receiving an analog input signal S0, the first operational amplifier A1 is connected with the linear photoelectric isolation device L1, and the linear photoelectric isolation device L1 is connected with the second operational amplifier A2.

[0030] One end of the isolated DC / DC power converter P1 is used for being connected with a safety power input SS, the safety power input SS is connected with the second operational amplifier A2 to provide a working power supply for an internal circuit of an output stage, and the other end of the isolated DC / DC power converter P1 is connected with the first operational amplifier A1 to provide a working power supply for an internal circuit of an input stage.

[0031] The isolated DC / DC power converter P1 provides a power supply for the internal circuit of the output stage by the safety power input from the mine analog signal isolator, and the power supply generated after the input power supply passes through the isolated DC / DC power converter provides a power supply for the internal circuit of the input stage.

[0032] In the present implementation, optionally, the linear photoelectric isolation device comprises a source-side phototransistor of an input stage, a source-side light-emitting diode of the input stage and a secondary-side phototransistor of an output stage.

[0033] In the present implementation, optionally, the analog signal conversion mode adopts a same-phase signal input isolation mode, the same-phase signal input isolation mode refers to a source-stage operational amplifier, a source-stage light-emitting diode, a source-stage phototransistor and the like circuit to form a source-stage analog signal input driving stage, a secondary-side phototransistor, an operational amplifier and the like circuit to form an analog signal output stage, the phase of the source-stage input signal is the same as the phase of the secondary-stage output signal, which is hereinafter referred to as a same-phase isolator 1.

[0034] In the same-phase isolator 1, as shown in Figure 2 The same-phase input end of the first operational amplifier A1 receives the analog input signal S0, the inverting input end of the first operational amplifier A1 is connected with the first end of the capacitor C1, the base of the source-stage phototransistor and the first end of the first resistor R1 respectively, and the output end of the first operational amplifier A1 is connected with the first end of the second resistor R2 and the second end of the capacitor C1 respectively.

[0035] The second end of the first resistor R1 is connected with the first operational amplifier A1 and grounded, the output power supply of the isolation DC / DC power converter is connected with the first operational amplifier A1, the output power supply of the isolation DC / DC power converter is connected with the collector of the source side phototransistor, the second end of the second resistor R2 is connected with the positive terminal of the source side LED, and the negative terminal of the source side LED is grounded.

[0036] In the present embodiment, optionally, the analog input signal S0 is input from the non-inverting terminal of the first operational amplifier A1, the output of the first operational amplifier A1 drives the source side LED in the linear photoelectric isolator after current limiting by the second resistor R2, the source side phototransistor senses the change of the light intensity of the source side LED by photoelectric effect, the output power supply of the isolation DC / DC power converter is fed back to the inverting input terminal of the first operational amplifier A1 through the equivalent variable resistor of the source side phototransistor and the first resistor R1 to form a negative feedback loop, and the capacitor C1 compensates the phase of the feedback loop.

[0037] In the present embodiment, optionally, the safe power supply is connected with the collector of the secondary side phototransistor, the base of the secondary side phototransistor is connected with the first section of the third resistor R3 and the non-inverting input terminal of the second operational amplifier A2 respectively, the second end of the third resistor R3 is connected with the second operational amplifier A2 and grounded, the safe power supply is connected with the second operational amplifier A2, the inverting input terminal of the second operational amplifier A2 is connected with the output terminal of the second operational amplifier A2, and the output terminal of the second operational amplifier A2 outputs the analog signal S1.

[0038] In the present embodiment, optionally, the secondary side phototransistor senses the change of the light intensity of the source side LED by photoelectric effect, the safe power supply is input to the non-inverting input terminal of the second operational amplifier A2 through the equivalent variable resistor of the secondary side phototransistor and the third resistor R3, and the analog signal S1 is output after being buffered by the second operational amplifier A2.

[0039] In the present embodiment, optionally, the analog signal conversion mode adopts an inverted signal input isolation mode, which refers to that the source side operational amplifier forms an inverting amplifier, the source side LED and the source side phototransistor form a source level analog signal input driving stage, the secondary side phototransistor and the operational amplifier form an inverting amplifier to form an analog signal output stage, the phase of the source side input signal is the same as that of the secondary side output signal, and the following is referred to as a same phase isolator 2.

[0040] The same phase isolator 2, as shown in Figure 3As shown, specifically, the non-inverting input terminal of the first operational amplifier A1 is connected to ground, the inverting input terminal of the first operational amplifier A1 is connected to the second terminal of the first resistor R1, the first terminal of the capacitor C1 and the collector of the source-side phototransistor respectively, the base of the source-side phototransistor is connected to ground, the first terminal of the first resistor R1 is used for receiving the analog input signal S0, the second terminal of the capacitor C1 is connected to the output terminal of the first operational amplifier A1, the output terminal of the first operational amplifier A1 is connected to the negative terminal of the source-side LED, the positive terminal of the source-side LED is connected to the first terminal of the second resistor R2, and the second terminal of the second resistor R2 is connected to the output power supply of the isolation DC / DC converter.

[0041] In the present embodiment, optionally, the analog input signal S0 is transmitted to the inverting input terminal of the first operational amplifier A1 through the first resistor R1, the output of the first operational amplifier A1 drives the internal source-side LED of the linear photoelectric isolator through the second resistor R2 and the output power supply of the isolation DC / DC converter, the source-side phototransistor senses the change of the light intensity of the source-side LED by photoelectric effect, and the equivalent variable resistor, the first resistor R1 and the first operational amplifier A1 constitute an inverting amplifier, and the capacitor C1 compensates the phase of the feedback loop.

[0042] In the present embodiment, optionally, the non-inverting input terminal of the second operational amplifier A2 is connected to ground and connected to the base of the secondary-side phototransistor, the inverting input terminal of the second operational amplifier A2 is connected to the collector of the secondary-side phototransistor and the first terminal of the third resistor R3 respectively, and the second terminal of the third resistor R3 is connected to the output terminal of the second operational amplifier A2.

[0043] In the present embodiment, optionally, the secondary-side phototransistor senses the change of the light intensity of the source-side LED by photoelectric effect, and the equivalent variable resistor, the third feedback resistor and the second operational amplifier A2 constitute an inverting amplifier, and the inverting amplifier outputs an analog signal S1. Wherein, the analog input signal S0 passes through two-stage inverting of the first operational amplifier A1 and the second operational amplifier A2 to form a non-inverting amplifier.

[0044] Due to the above linear photoelectric isolation technology characteristics, the insulation strength between the input and the output can reach a minimum of 3750V RMSThe above, for the power supply of the above-mentioned circuit, the device is powered by a safety power supply meeting the requirements of mining. The primary / secondary isolation voltage strength of the internal isolated DC / DC power converter of the device can reach at least 3000VDC or above. According to the linear photoelectric isolation technology features and the characteristics of the isolated DC / DC power converter, the circuit board of the device meets the corresponding technical standards and specifications, and the insulation strength between the input, output and power supply of the device can reach 3000V.

[0045] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A linear opto-isolation based analog signal isolator for mine use, comprising: a first operational amplifier for receiving an analog input signal, a linear opto-isolation device connected to the first operational amplifier, and a second operational amplifier connected to the linear opto-isolation device; and an isolated DC / DC power converter having one end connected to a safety power supply and the other end connected to the first operational amplifier to provide a working power supply for internal circuits of an input stage.

2. The linear opto-isolation based analog signal isolator for mine use according to claim 1, wherein the linear opto-isolation device comprises a source-side phototransistor of an input stage, a source-side LED of the input stage, and a secondary-side phototransistor of an output stage.

3. The linear opto-isolation based analog signal isolator for mine use according to claim 2, wherein the analog signal conversion mode adopts a non-inverted signal input isolation mode, the non-inverted input terminal of the first operational amplifier receives an analog input signal, the inverted input terminal of the first operational amplifier is connected to a first terminal of a capacitor, a base of the source-side phototransistor, and a first terminal of a first resistor, respectively, and the output terminal of the first operational amplifier is connected to a first terminal of a second resistor and a second terminal of the capacitor, respectively; the second terminal of the first resistor is connected to the first operational amplifier and grounded, the output power supply of the isolated DC / DC power converter is connected to the first operational amplifier, the output power supply of the isolated DC / DC power converter is connected to a collector of the source-side phototransistor, the second terminal of the second resistor is connected to a positive terminal of the source-side LED, and a negative terminal of the source-side LED is grounded.

4. The linear opto-isolation based analog signal isolator for mine use according to claim 3, wherein the analog input signal is input from the non-inverted input terminal of the first operational amplifier, the output of the first operational amplifier drives the source-side LED of the linear opto-isolation device after current limiting by the second resistor, the source-side phototransistor senses the change in luminous intensity of the source-side LED by photoelectric effect, the output power supply of the isolated DC / DC power converter is fed back to the inverted input terminal of the first operational amplifier via the equivalent variable resistor of the source-side phototransistor and the first resistor to form a negative feedback loop, and the capacitor compensates the phase of the feedback loop.

5. The linear opto-isolation based analog signal isolator for mine use according to claim 3 or 4, wherein the output of the first operational amplifier is connected to the non-inverted input terminal of the second operational amplifier to form a non-inverted signal output isolation mode, the non-inverted input terminal of the second operational amplifier is connected to a first terminal of a third resistor, a base of a secondary-side phototransistor, and a first terminal of a fourth resistor, respectively, and the output terminal of the second operational amplifier is connected to a first terminal of a fifth resistor and a second terminal of the third resistor, respectively; the second terminal of the third resistor is connected to the second operational amplifier and grounded, the output power supply of the isolated DC / DC power converter is connected to the second operational amplifier, the output power supply of the isolated DC / DC power converter is connected to a collector of the secondary-side phototransistor, the second terminal of the fourth resistor is connected to a positive terminal of a source-side LED of the output stage, and a negative terminal of the source-side LED of the output stage is grounded. ​ ​ ​ ​ ​ ​ ​ The safety power supply is linked with the collector of the secondary edge phototransistor, the base of the secondary edge phototransistor is connected with the first section of the third resistor and the non-inverting input of the second operational amplifier respectively, the second end of the third resistor is connected with the second operational amplifier and grounded, the safety power supply is connected with the second operational amplifier, the inverting input of the second operational amplifier is connected with the output of the second operational amplifier, and the output of the second operational amplifier outputs an analog signal.

6. The linear opto-isolation based analog signal isolator for mine use according to claim 5, wherein, The secondary edge phototransistor senses the change of the light intensity of the source edge light emitting diode through photoelectric effect, the safety power supply is input to the non-inverting input of the second operational amplifier through the equivalent variable resistor of the secondary edge phototransistor and the third resistor, and an analog signal is output after being buffered by the second operational amplifier.

7. The linear opto-isolation based analog signal isolator for mine use according to claim 2, wherein, The analog signal conversion mode adopts an inverting signal input isolation mode, the non-inverting input of the first operational amplifier is grounded, the inverting input of the first operational amplifier is connected with the second end of the first resistor, the first end of the capacitor and the collector of the source edge phototransistor respectively, the base of the source edge phototransistor is grounded, the first end of the first resistor is used for receiving an analog input signal, the second end of the capacitor is connected with the output of the first operational amplifier, the output of the first operational amplifier is connected with the negative terminal of the source edge light emitting diode, the positive terminal of the source edge light emitting diode is connected with the first end of the second resistor, and the second end of the second resistor is connected with the output power supply of the isolation DC / DC power converter.

8. The linear opto-isolation based analog signal isolator for mine use according to claim 7, wherein, The analog input signal is transmitted to the inverting input of the first operational amplifier through the first resistor, the output of the first operational amplifier drives the source edge light emitting diode in the linear opto-isolation based analog signal isolator through the second resistor and the output power supply of the isolation DC / DC power converter, the source edge phototransistor senses the change of the light intensity of the source edge light emitting diode through photoelectric effect, the equivalent variable resistor, the first resistor and the first operational amplifier constitute an inverting amplifier, and the capacitor compensates the phase of the feedback loop.

9. The linear opto-isolation based analog signal isolator for mine use according to claim 7, wherein, The non-inverting input of the second operational amplifier is grounded and connected with the base of the secondary edge phototransistor, the inverting input of the second operational amplifier is connected with the collector of the secondary edge phototransistor and the first end of the third resistor respectively, and the second end of the third resistor is connected with the output of the second operational amplifier.

10. The linear opto-isolation based analog signal isolator for mine use according to claim 9, wherein, The secondary edge photo-sensitive transistor senses the change of the light intensity of the source edge light-emitting diode by photoelectric effect, and an equivalent variable resistor, a third feedback resistor and the second operational amplifier constitute an inverting amplifier, and the inverting amplifier outputs an analog signal.

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