Power supply circuit of inertial navigation equipment

Abstract

The utility model discloses a power supply circuit of inertial navigation equipment, which relates to the technical field of power supplies and comprises a UPS (Uninterrupted Power Supply) power supply module, a servo power supply module, an inertial power supply module, an excitation power supply module and a programmable power supply module, the excitation power supply module receives DC (Direct Current) voltage output by the UPS power supply module, and the programmable power supply module supplies power to the servo power supply module, the inertial power supply module and the excitation power supply module; the DC voltage is filtered by the first filtering unit and then is connected to the two isolated DC-DC circuits, the two isolated DC-DC circuits form the first DC-DC unit, and stable sine waves are generated through the excitation power supply module by using a Wien bridge oscillation circuit formed by two power amplifiers, so that the power supply device can stably work with load for a long time, and the power supply device can work stably with load for a long time. Functional performance is normal, partial circuits of program control sub-modules in the program control power supply module collect voltage parameters output by the servo power supply module, the inertia power supply module and the excitation power supply module, a sampling circuit is also subjected to full-isolation design, and the risk of interference of each power supply to a control circuit is reduced.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, specifically to a power supply circuit for an inertial navigation device. Background Technology

[0002] Inertial navigation devices are sensor-based navigation systems widely used in aerospace, marine, automotive, and autonomous driving fields. Their core components are high-precision accelerometers and gyroscopes, while the power supply circuit is crucial for ensuring normal operation. The power supply circuit needs to provide a stable and reliable power source to support real-time data acquisition and processing from the sensors. Effective power supply design not only improves the performance and stability of the device but also extends its lifespan. With technological advancements, the performance requirements for inertial navigation devices are becoming increasingly stringent, making the optimized design of the power supply circuit particularly important and of significant practical application value.

[0003] The power supply circuits in existing inertial navigation equipment power supply units are prone to unstable power performance under extreme temperature, humidity, or marine climate conditions. The power supply unit cannot provide uninterrupted power supply for a long time under high load conditions. At the same time, electromagnetic interference inside or outside the ship can easily affect the power signal, causing output fluctuations. Therefore, it is necessary to provide a power supply circuit for inertial navigation equipment to solve the above-mentioned problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, an inertial navigation device power supply circuit is provided. This technical solution solves the problem that the power supply circuit in the existing inertial navigation device power supply device mentioned in the background technology is difficult to maintain stable power supply performance under extreme temperature, humidity or marine climate conditions. The power supply device is difficult to provide uninterrupted power supply for a long time under high load conditions. At the same time, electromagnetic interference inside or outside the ship can easily affect the power signal, resulting in output fluctuations.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An inertial navigation device power supply circuit, comprising:

[0007] A programmable power supply module, comprising a programmable submodule and a power supply submodule, wherein the power supply submodule consists of a second input filtering unit, a second DC-DC unit, a second output filtering unit, and a second external output unit;

[0008] The power supply submodule consists of an auxiliary power supply unit, an isolation voltage acquisition unit, an MCU control unit, a digital isolation unit, and an RS422 isolation unit. The isolation voltage acquisition unit is equipped with a first isolation voltage acquisition circuit, a second isolation voltage acquisition circuit, a third isolation voltage acquisition circuit, a fourth isolation voltage acquisition circuit, and a fifth isolation voltage acquisition circuit.

[0009] Preferably, the excitation power module receives the DC voltage output by the UPS power module. After being filtered by the first filtering unit, the DC voltage is connected to two isolated DC-DC circuits. The two isolated DC-DC circuits form a first DC-DC unit. The DC28V output from the two ends of the first DC-DC unit is connected in series and filtered to obtain DC±28V. The DC±28V is then connected to a Wien bridge oscillator circuit for processing to obtain AC36V, which is then output by the first external output unit.

[0010] Preferably, the power supply submodule is connected to the DC27V output of the UPS power supply module, and the DC27V output of the UPS power supply module is connected to the second input filter unit. The second input filter unit and the second output filter unit are both composed of two filter circuits. The second DC-DC unit is composed of two DC-DC circuits. The second output filter unit and the second external output unit are also connected.

[0011] The DC27V output from the UPS power module is filtered by the second input filter unit and then processed by the second DC-DC unit to obtain DC24V. The processed DC24V is then input to the second output filter unit. The DC27V output from the UPS power module is also input to the auxiliary power unit through a filter circuit.

[0012] Preferably, the auxiliary power supply unit supplies power to the MCU control unit, the first isolation voltage acquisition circuit, the second isolation voltage acquisition circuit, the third isolation voltage acquisition circuit, the fourth isolation voltage acquisition circuit, and the fifth isolation voltage acquisition circuit;

[0013] The isolated voltage acquisition circuit consists of an isolated power supply, an isolated voltage sampling circuit, and an operational amplifier circuit. The isolated power supply outputs DC 3.3V and inputs it to the isolated voltage sampling circuit. The analog voltage signal generated by the isolated voltage sampling circuit is input to the operational amplifier circuit, which converts the analog voltage signal into a digital signal for output.

[0014] Preferably, the first isolation voltage acquisition circuit and the second isolation voltage acquisition circuit are connected to the two DC24V outputs of the second output filter unit through the second external output unit, and the digital signals output by the first isolation voltage acquisition circuit and the second isolation voltage acquisition circuit are jointly connected to the MCU control unit.

[0015] Preferably, the third, fourth, and fifth isolation voltage acquisition circuits are respectively connected to the DC28V output of the servo power supply module, the DC24V output of the inertial power supply module, and the AC36V output of the excitation power supply module.

[0016] Preferably, when the external power is disconnected, the UPS power module switches to battery mode to supply power to the servo power module, inertial power module, excitation power module and programmable power module. When the external power is connected, the UPS power module receives AC220V filtered by an external filter and supplies power to the servo power module, inertial power module, excitation power module and programmable power module.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] In the power supply circuit of the inertial navigation device proposed in this solution, a stable sine wave is generated by the excitation power module through a Wien bridge oscillation circuit composed of two power amplifiers, enabling the power supply device to operate stably under load for a long time with normal function and performance. The programmable sub-module of the programmable power module collects the voltage parameters output by the servo power module, inertial power module, and excitation power module. The sampling circuit is also designed with full isolation to reduce the risk of interference from each power supply to the control circuit. The collected voltage data is communicated with the outside via RS422 according to the technical protocol to receive commands to control the power supply on and off. The programmable sub-module has a full isolation design, ESD protection design, and electromagnetic compatibility design to enhance the anti-interference capability of the programmable power module. Attached Figure Description

[0019] Figure 1 Functional block diagram of the power supply unit for inertial navigation equipment;

[0020] Figure 2 This is a schematic block diagram of the programmable power supply module of this utility model;

[0021] Figure 3 This is the schematic diagram of the excitation power supply module of this utility model.

[0022] Figure 4 and Figure 5 The circuit diagram of the excitation power supply module of this utility model is shown below. Detailed Implementation

[0023] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0024] Reference Figure 1 - Figure 5As shown, a power supply circuit for an inertial navigation device includes:

[0025] UPS power supply module, which supplies power to servo power supply module, inertial power supply module, excitation power supply module and programmable power supply module;

[0026] The excitation power module receives the DC voltage output from the UPS power module. After being filtered by the first filter unit, the DC voltage is connected to two isolated DC-DC circuits. The two isolated DC-DC circuits form the first DC-DC unit. The DC28V output from the two ends of the first DC-DC unit is connected in series and filtered to obtain DC±28V. The DC±28V is then connected to the Wien bridge oscillator circuit for processing to obtain AC36V, which is then output by the first external output unit.

[0027] Furthermore, the programmable power supply module includes a programmable submodule and a power supply submodule. The power supply submodule consists of a second input filtering unit, a second DC-DC unit, a second output filtering unit, and a second external output unit.

[0028] The power supply submodule consists of an auxiliary power supply unit, an isolation voltage acquisition unit, an MCU control unit, a digital isolation unit, and an RS422 isolation unit. The isolation voltage acquisition unit is equipped with a first isolation voltage acquisition circuit, a second isolation voltage acquisition circuit, a third isolation voltage acquisition circuit, a fourth isolation voltage acquisition circuit, and a fifth isolation voltage acquisition circuit.

[0029] Furthermore, the power supply submodule is connected to the DC27V output of the UPS power supply module, and the DC27V output of the UPS power supply module is connected to the second input filter unit. The second input filter unit and the second output filter unit are both composed of two filter circuits. The second DC-DC unit is composed of two DC-DC circuits. The second output filter unit and the second external output unit are also connected.

[0030] The DC27V output from the UPS power module is filtered by the second input filter unit and then processed by the second DC-DC unit to obtain DC24V. The processed DC24V is then input to the second output filter unit. The DC27V output from the UPS power module is also input to the auxiliary power unit through a filter circuit.

[0031] Furthermore, the auxiliary power supply unit provides power to the MCU control unit, the first isolation voltage acquisition circuit, the second isolation voltage acquisition circuit, the third isolation voltage acquisition circuit, the fourth isolation voltage acquisition circuit, and the fifth isolation voltage acquisition circuit;

[0032] The isolation voltage acquisition circuit consists of an isolation power supply, an isolation voltage sampling circuit, and an operational amplifier circuit. The isolation power supply outputs DC 3.3V and inputs it to the isolation voltage sampling circuit. The analog voltage signal generated by the isolation voltage sampling circuit is input to the operational amplifier circuit, which converts the analog voltage signal into a digital signal for output.

[0033] Furthermore, the first isolation voltage acquisition circuit and the second isolation voltage acquisition circuit are connected to the second output filter unit and output two DC24V signals through the second external output unit. The digital signals output by the first isolation voltage acquisition circuit and the second isolation voltage acquisition circuit are jointly connected to the MCU control unit.

[0034] Furthermore, the third, fourth, and fifth isolation voltage acquisition circuits are respectively connected to the DC28V output of the servo power supply module, the DC24V output of the inertial power supply module, and the AC36V / 400Hz output of the excitation power supply module.

[0035] Furthermore, the MCU control unit is electrically connected to the digital isolation unit and the RS422 isolation unit respectively. The MCU control unit communicates with the outside via the RS422 isolation unit according to the technical protocol, receives instructions to control the on / off of the external power supply, and controls two LEDs through the digital isolation unit to indicate the on / off of the external power supply.

[0036] Specifically, the excitation power module adopts a mature solution, utilizing a linear power amplifier and a Wien bridge oscillator circuit to achieve DC-AC conversion. The output of the excitation power module is an AC36V / 400Hz sine wave. The Wien bridge oscillator circuit is used to generate the sine wave output. The core of the Wien bridge oscillator circuit is a linear power amplifier. By using two power amplifiers to form a Wien bridge oscillator circuit, a stable sine wave is generated. This design has been experimentally verified, and it can operate stably under load for a long time with normal function and performance. The Wien bridge oscillator circuit requires positive and negative power supplies (±28V). Two isolated DC-DC circuits are used, and the output side of the circuit is connected in series, with the intermediate series point as a reference ground, thus obtaining a ±28V power supply.

[0037] The programmable power supply module consists of two parts: a programmable submodule and a power supply submodule. The power supply submodule mainly consists of an input filter circuit, a DC-DC module, and an output filter circuit. The filter circuit uses common-mode inductors, common-mode capacitors, and differential-mode capacitors. The filter circuit is designed at the input and output terminals. By reasonably configuring the filter device parameters, the power supply ripple is reduced, the protection against power switching noise and electromagnetic interference is enhanced, and the power output performance quality is optimized.

[0038] Working principle and implementation: The circuit of the programmable submodule collects the voltage parameters output by the servo power supply module, inertial power supply module and excitation power supply module. The sampling circuit is also designed with full isolation to reduce the risk of interference from each power supply module to the programmable submodule. The collected voltage data is communicated with the outside via RS422 according to the technical protocol. The programmable submodule receives commands to control the power supply on and off. The programmable submodule has a full isolation design, ESD protection design and electromagnetic compatibility design to enhance the anti-interference capability of the programmable power supply module.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A power supply circuit for an inertial navigation device, characterized in that, include: The UPS power module switches to battery mode to power the servo power module, inertial power module, excitation power module and programmable power module when the external power is disconnected. When the external power is connected, the UPS power module receives AC220V filtered by an external filter and powers the servo power module, inertial power module, excitation power module and programmable power module. A programmable power supply module, comprising a programmable submodule and a power supply submodule, wherein the power supply submodule consists of a second input filtering unit, a second DC-DC unit, a second output filtering unit, and a second external output unit; The power supply submodule consists of an auxiliary power supply unit, an isolation voltage acquisition unit, an MCU control unit, a digital isolation unit, and an RS422 isolation unit. The isolation voltage acquisition unit is equipped with a first isolation voltage acquisition circuit, a second isolation voltage acquisition circuit, a third isolation voltage acquisition circuit, a fourth isolation voltage acquisition circuit, and a fifth isolation voltage acquisition circuit.

2. The power supply circuit for an inertial navigation device according to claim 1, characterized in that: The excitation power module receives the DC voltage output from the UPS power module. After being filtered by the first filter unit, the DC voltage is connected to two isolated DC-DC circuits. The two isolated DC-DC circuits form the first DC-DC unit. The DC28V output from the two ends of the first DC-DC unit is connected in series and filtered to obtain DC±28V. The DC±28V is then connected to the Wien bridge oscillator circuit for processing to obtain AC36V, which is then output by the first external output unit.

3. The power supply circuit for an inertial navigation device according to claim 2, characterized in that: The power submodule is connected to the DC27V output of the UPS power module. The DC27V output of the UPS power module is connected to the second input filter unit. The second input filter unit and the second output filter unit are both composed of two filter circuits. The second DC-DC unit is composed of two DC-DC circuits. It consists of a second output filtering unit and a second external output unit; The DC27V output from the UPS power module is filtered by the second input filter unit and then processed by the second DC-DC unit to obtain DC24V. The processed DC24V is then input to the second output filter unit. The DC27V output from the UPS power module is also input to the auxiliary power unit through a filter circuit.

4. The power supply circuit for an inertial navigation device according to claim 3, characterized in that: The auxiliary power supply unit provides power to the MCU control unit, the first isolation voltage acquisition circuit, the second isolation voltage acquisition circuit, the third isolation voltage acquisition circuit, the fourth isolation voltage acquisition circuit, and the fifth isolation voltage acquisition circuit. The isolated voltage acquisition circuit consists of an isolated power supply, an isolated voltage sampling circuit, and an operational amplifier circuit. The isolated power supply outputs DC 3.3V and inputs it to the isolated voltage sampling circuit. The analog voltage signal generated by the isolated voltage sampling circuit is input to the operational amplifier circuit, which converts the analog voltage signal into a digital signal for output.

5. The power supply circuit for an inertial navigation device according to claim 4, characterized in that: The first isolation voltage acquisition circuit and the second isolation voltage acquisition circuit are connected to the second output filter unit and output two DC24V signals through the second external output unit. The digital signals output by the first isolation voltage acquisition circuit and the second isolation voltage acquisition circuit are connected to the MCU control unit.

6. The power supply circuit for an inertial navigation device according to claim 5, characterized in that: The third, fourth, and fifth isolation voltage acquisition circuits are respectively connected to the DC28V output of the servo power supply module, the DC24V output of the inertial power supply module, and the AC36V output of the excitation power supply module.

7. The power supply circuit for an inertial navigation device according to claim 6, characterized in that: The MCU control unit is electrically connected to the digital isolation unit and the RS422 isolation unit respectively. The MCU control unit communicates with the outside via the RS422 isolation unit according to the technical protocol, receives instructions to control the on / off of the external power supply, and controls two LEDs through the digital isolation unit to indicate the on / off of the external power supply.

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