Isolated multi-channel analog signal amplification output circuit

Abstract

This invention relates to the field of aerospace electronics technology, specifically to an isolated multi-channel analog signal amplification and output circuit, which is connected to an external host computer. The circuit includes: a signal generator; a signal amplifier connected to the output of the signal generator and the host computer; a main control chip connected to a communication chip; a communication chip coupled between the main control chip and the host computer; multiple isolation relays; and multiple drive circuits. Each isolation relay's output is connected to a corresponding output channel, and the signal amplifier forms multiple parallel signal paths with its corresponding output channels through each isolation relay. Through an architecture combining adjustable waveform output and multi-channel isolation gating, efficient and automated multi-device synchronous calibration is achieved. By controlling the on / off state of each isolation relay, the corresponding output channel is independently selected, significantly improving testing efficiency.

Description

Technical Field

[0001] This invention relates to the field of aerospace electronics technology, and in particular to an isolated multi-channel analog signal amplification and output circuit. Background Technology

[0002] Telemetry and recording equipment in aerospace applications require the acquisition of system analog signals. Using these acquired analog signals, along with the output signals from the telemetry and recording equipment after receiving the input analog signals, calibration can be performed. However, the calibration process typically only allows for single-channel calibration, resulting in low overall testing efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide an isolated multi-channel analog signal amplification and output circuit to solve the problem of low testing efficiency in the prior art.

[0004] To achieve the above objectives, the present invention provides an isolated multi-channel analog signal amplification and output circuit, externally connected to a host computer, comprising: A signal generator is connected to the host computer and the signal amplifier respectively, and is used to generate corresponding analog waveforms according to the control signals of the host computer and output them to the signal amplifier. A signal amplifier is connected to the output of the signal generator and the host computer, and its output is connected to the input of multiple isolation relays. The main control chip is connected to the communication chip and is connected in parallel with multiple drive circuits to control the conduction of the corresponding isolation relays through the drive circuits; A communication chip is coupled between the main control chip and the host computer to transmit instructions between the host computer and the main control chip; Multiple isolation relays, each of which is connected to a corresponding drive circuit; Multiple driving circuits, each of which is connected to the main control chip and the corresponding isolation relay; Each of the isolation relays is connected to a corresponding output channel. The signal amplifier forms multiple parallel signal paths with each isolation relay and its corresponding output channel. The isolation relay is configured to be turned on or off under the control of the corresponding drive circuit to select the waveform signal to the corresponding output channel.

[0005] To address the issue of low testing efficiency for telemetry and recorder equipment in existing technologies, this invention first establishes a signal generator controlled by a host computer to produce the required analog waveform. Then, the amplification factor of the signal generator, also controlled by the host computer, is adjusted, and the required voltage amplitude is correspondingly regulated. The host computer then sends commands to the main control chip, which, through the drive circuit, controls the corresponding isolation relay to conduct, thus obtaining the amplified output waveform for the corresponding output channel. Since each signal path is independent, multiple output channels can be simultaneously started and stopped by the host computer, enabling the calibration of multiple telemetry and recorder equipment.

[0006] Each of the isolation relays includes a first switch contact and a second switch contact. The first switch contact is connected in series in the positive signal path between the signal amplifier and the output channel, and the second switch contact is connected in series in the negative signal path between the signal amplifier and the output channel. The first switch contact and the second switch contact switch synchronously under the control of the drive circuit to simultaneously turn on or off the positive signal path and the negative signal path.

[0007] Each isolation relay includes a mechanically linked first and second switch contact. Under the control of the drive circuit, the first and second switch contacts switch synchronously, thereby simultaneously connecting or disconnecting the positive and negative signal paths. This achieves synchronous and isolated on / off control of the signal for each output channel. Through this structure, the amplified waveform output by the signal amplifier can be distributed to each output channel via multiple independent isolation relays. The on / off state of each channel is independently controlled by the corresponding drive circuit. This ensures electrical isolation between channels and between channels and the front-end control circuit while achieving multi-channel output, thus improving the system's safety, anti-interference capability, and reliability.

[0008] The signal amplifier includes a first output terminal and a second output terminal. The first output terminal is connected to each of the first switch contacts, and the second output terminal is connected to each of the second switch contacts.

[0009] The first output terminal is the positive output terminal, and the second output terminal is the negative output terminal.

[0010] The first output terminal is connected to the first switch contact of each isolation relay, and the second output terminal is connected to the second switch contact of each isolation relay. A first switch contact is connected in series in the positive signal path of each output channel, and a corresponding second switch contact is connected in series in the negative signal path. When the corresponding drive circuit is controlled by the main control chip, its first and second switch contacts operate synchronously, thereby simultaneously turning on or off the positive and negative signal paths of that channel, achieving isolated gating control of the channel's output signal.

[0011] The isolation relay is a dual-channel single-pole double-throw relay.

[0012] Each relay integrates two independent but mechanically linked sets of single-pole double-throw (SPD) switches, corresponding to the control of the positive and negative signal paths, respectively. Each SPD switch includes a common terminal, a normally open contact, and a normally closed contact. The common terminal is connected to the corresponding output terminal of the signal amplifier, while the normally open or normally closed contact is selectively connected to the output channel. The double-throw structure allows for flexible configuration of the electrical connection state of the output channel, further enhancing the flexibility of signal switching and the functionality of the system.

[0013] The signal amplifier can be any one of a differential amplifier, an instrumentation amplifier, or a power amplifier.

[0014] The present invention has at least the following beneficial effects: by outputting a large voltage analog signal through a signal generator, signal amplifier, main control chip, isolation relay, etc., it is used for automatic calibration testing of the analog acquisition channel of telemetry equipment and recorder equipment, which can greatly reduce manual interpretation, save labor costs, reduce testing time and improve calibration efficiency.

[0015] This invention provides an isolated multi-channel analog signal amplification and output circuit. Addressing the low efficiency issues in the calibration process of existing telemetry and recorder equipment, this circuit achieves efficient and automated synchronous calibration of multiple devices through an architecture combining adjustable waveform output and multi-channel isolation gating. The circuit can flexibly generate and output various test waveforms according to actual calibration requirements, and independently select corresponding output channels by controlling the on / off state of each isolation relay, thereby enabling the utilization of multiple devices or multiple channels and significantly improving testing efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an isolated multi-channel analog signal amplification and output circuit according to the present invention. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] It should be noted that the terms "first" and "second" used in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0020] Please see Figure 1 This invention provides an isolated multi-channel analog signal amplification and output circuit, externally connected to a host computer, comprising: Signal generator 1 is connected to the host computer and signal amplifier 2 respectively, and is used to generate corresponding analog waveforms according to the control signals of the host computer and output them to signal amplifier 2. Signal amplifier 2 is connected to the output terminal of signal generator 1 and the host computer, and its output terminal is connected to the input terminal of multiple isolation relays 5; The main control chip 3 is connected to the communication chip 4 and is connected in parallel with multiple drive circuits 6 to control the conduction of the corresponding isolation relays 5 through the drive circuits 6. The communication chip 4 is coupled between the main control chip 3 and the host computer to transmit instructions between the host computer and the main control chip 3; Multiple isolation relays 5 are connected to a drive circuit 6 in a one-to-one correspondence. Multiple drive circuits 6, each of which is connected to the main control chip 3 and the corresponding isolation relay 5; Each of the isolation relays 5 has its output terminal connected to a corresponding output channel. The signal amplifier 2 forms multiple parallel signal paths with each of the isolation relays 5 and their corresponding output channels. The isolation relays 5 are configured to be turned on or off under the control of the corresponding drive circuit 6 to select the waveform signal to the corresponding output channel.

[0021] In this embodiment, the signal generator 1 is communicatively connected to both the host computer and the signal amplifier 2. The signal generator 1 receives control commands from the host computer and generates corresponding analog waveforms based on these commands. The generated waveform signal is output to the signal amplifier 2 for further processing. The output of the signal amplifier 2 is connected to multiple isolation relays 5, thereby distributing the amplified signal to each output channel. The communication chip 4 is coupled between the host computer and the main control chip 3, enabling command and data transmission between them. The main control chip 3, as the control core, is connected to the communication chip 4 and is used to parse control commands from the host computer. The main control chip 3 is also connected in parallel to multiple drive circuits 6, each drive circuit 6 corresponding to one output channel. The main control chip 3 indirectly controls the on / off state of the corresponding isolation relay 5 by sending control signals to the corresponding drive circuit 6. The drive circuit 6 serves as the interface between the main control chip 3 and the isolation relay 5, with its input connected to the main control chip 3. Each isolation relay 5 corresponds to an independent output channel. When the host computer needs to output a signal through a certain channel, it sends a command to the main control chip 3 through the communication chip 4. The main control chip 3 controls the corresponding drive circuit 6 to operate, driving the coil of the isolation relay 5 to actuate and close the switch contacts on its controlled side. At this time, the signal path is connected, and the amplified waveform signal is output to the corresponding output channel through the isolation relay 5, thereby driving the external load. Channels that do not receive a conduction command have their isolation relay 5 in an open state, and the output channel has no signal output. Through the above connection method, multiple mutually isolated and independently controllable signal paths are formed between each isolation relay 5 and the signal amplifier 2. The circuit design of this application, on the one hand, enables each output channel to independently acquire and output amplified waveform signals to meet the calibration requirements of telemetry and recorder equipment; on the other hand, it effectively avoids the impact of crosstalk between channels and load-side faults on the upstream system, improving the system's anti-interference capability.

[0022] Furthermore, each of the isolation relays 5 includes a first switch contact 7 and a second switch contact 8. The first switch contact 7 is connected in series in the positive signal path between the signal amplifier 2 and the output channel, and the second switch contact 8 is connected in series in the negative signal path between the signal amplifier 2 and the output channel. The first switch contact 7 and the second switch contact 8 switch synchronously under the control of the drive circuit 6 to simultaneously connect or disconnect the positive signal path and the negative signal path.

[0023] The first switch contact 7 is connected in series between the positive output terminal of the signal amplifier 2 and the positive terminal of the corresponding output channel, forming the positive signal path of that channel. The second switch contact 8 is connected in series between the negative output terminal of the signal amplifier 2 and the negative terminal of the corresponding output channel, forming the negative signal path of that channel. Both the first switch contact 7 and the second switch contact 8 are controlled by the same drive circuit 6. When the drive circuit 6 of this channel receives a conduction command from the main control chip 3, it drives the relay coil to operate, thereby synchronously closing the first switch contact 7 and the second switch contact 8. At this time, the positive signal path and the negative signal path are simultaneously turned on, and the signal can be completely output from the signal amplifier 2 to the output channel. When the drive circuit 6 stops driving, the two sets of contacts are synchronously opened under the action of mechanical reset, the positive and negative signal paths are simultaneously cut off, the output of this channel is completely turned off, and electrical isolation is achieved from the signal amplifier 2 side.

[0024] Furthermore, the signal amplifier 2 includes a first output terminal 9 and a second output terminal 10. The first output terminal 9 is connected to each of the first switch contacts 7, and the second output terminal 10 is connected to each of the second switch contacts 8.

[0025] The first output terminal 9 is the positive output terminal, and the second output terminal 10 is the negative output terminal.

[0026] In this embodiment, the signals output by the signal amplifier 2 are distributed in parallel. Meanwhile, the first switch contact 7 and the second switch contact 8 of each isolation relay 5 are connected in series in the positive signal path and the negative signal path of the corresponding output channel, respectively, and together with the corresponding output terminal of the amplifier, they form a signal path. The first output terminal 9 is the positive output terminal connected to the positive signal path, and the second output terminal 10 is the negative output terminal connected to the negative signal path.

[0027] Furthermore, the isolation relay 5 is a dual-channel single-pole double-throw relay.

[0028] In this embodiment, each of the isolation relays 5 integrates two sets of mechanically linked single-pole double-throw switches, which are used to control the positive and negative signal paths of the corresponding output channels, respectively. Each set of single-pole double-throw switches includes a common terminal, a normally open contact, and a normally closed contact. The common terminal is connected to the corresponding output terminal of the signal amplifier 2, and the normally open or normally closed contact is selectively connected to the output channel according to circuit configuration requirements. This double-throw structure supports flexible configuration of the electrical connection state of the output channel, thereby expanding the signal switching modes and enhancing the adaptability of the system in different application scenarios.

[0029] This invention implements a multi-channel synchronous output scheme driven by a single signal amplifier 2 and distributed through multiple isolation relays 5. Each output channel can be turned on and off independently and synchronously, and electrical isolation is achieved between channels and between channels and the front-end control circuit. This not only significantly improves the system's integration and consistency but also effectively isolates potential interference and faults at the load end, ensuring the safety of the front-end precision signal generation and amplification circuit, and enhancing the reliability and anti-interference capability of the entire output system.

[0030] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. An isolated multi-channel analog signal amplification and output circuit, externally connected to a host computer, characterized in that, include: A signal generator is connected to the host computer and the signal amplifier respectively, and is used to generate corresponding analog waveforms according to the control signals of the host computer and output them to the signal amplifier. A signal amplifier is connected to the output of the signal generator and the host computer, and its output is connected to the input of multiple isolation relays. The main control chip is connected to the communication chip and is connected in parallel with multiple drive circuits to control the conduction of the corresponding isolation relays through the drive circuits; A communication chip is coupled between the main control chip and the host computer to transmit instructions between the host computer and the main control chip; Multiple isolation relays, each of which is connected to a corresponding drive circuit; Multiple driving circuits, each of which is connected to the main control chip and the corresponding isolation relay; Each of the isolation relays is connected to a corresponding output channel. The signal amplifier forms multiple parallel signal paths with each isolation relay and its corresponding output channel. The isolation relay is configured to be turned on or off under the control of the corresponding drive circuit to select the waveform signal to the corresponding output channel.

2. The isolated multi-channel analog signal amplification and output circuit as described in claim 1, characterized in that, Each of the aforementioned isolation relays includes a first switch contact and a second switch contact. The first switch contact is connected in series in the positive signal path between the signal amplifier and the output channel, and the second switch contact is connected in series in the negative signal path between the signal amplifier and the output channel. The first switch contact and the second switch contact are switched synchronously under the control of the drive circuit to simultaneously turn on or off the positive signal path and the negative signal path.

3. The isolated multi-channel analog signal amplification and output circuit as described in claim 2, characterized in that, The signal amplifier includes a first output terminal and a second output terminal. The first output terminal is connected to each of the first switch contacts, and the second output terminal is connected to each of the second switch contacts.

4. The isolated multi-channel analog signal amplification and output circuit as described in claim 3, characterized in that, The first output terminal is the positive output terminal, and the second output terminal is the negative output terminal.

5. An isolated multi-channel analog signal amplification and output circuit as described in any one of claims 1 to 4, characterized in that, The isolation relay is a dual-channel single-pole double-throw relay.

6. An isolated multi-channel analog signal amplification and output circuit as described in any one of claims 1 to 4, characterized in that, The signal amplifier can be any one of a differential amplifier, an instrumentation amplifier, or a power amplifier.

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