Isolation voltage acquisition circuit device of alternating-current solid-state power controller

Abstract

The invention provides an AC solid-state power controller isolation voltage acquisition circuit device, and the device comprises an AC voltage acquisition unit which is used for achieving the voltage acquisition of an AC solid-state power controller; the isolated power supply unit is used for providing an isolated power supply for the alternating-current voltage acquisition unit; the reference voltage unit is used for providing reference voltage for the AC voltage acquisition unit; and the power supply unit provides a power supply for the AC voltage acquisition unit. According to the technical scheme of the invention, the size of the sampling circuit can be reduced while voltage acquisition is realized, and the acquisition precision and safety of the sampling circuit are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and particularly to an isolation voltage acquisition circuit device for an AC solid state power controller. Background Art

[0002] A solid state power controller (SSPC for short) is a solid state power distribution device that takes semiconductor power tubes as the core and integrates the switching function of a relay and the protection function of a circuit breaker. An AC SSPC can connect or disconnect an AC power circuit, and has the ability to limit the starting impact current of a load, the system surge impact current, and the fault current. The SSPC has the advantages of no contacts, no arc, no noise, fast response, low electromagnetic interference, long service life, high reliability, and being convenient for remote computer control.

[0003] The solid state power controller (SSPC) can be widely applied to the power distribution systems of equipment such as aviation, aerospace, and weapons, and the electrical systems of equipment. It has a wide range of uses and strong market demand. With the wide application of the solid state power controller (SSPC), the importance of the voltage sampling and detection circuit for the solid state controller has also become the focus of attention.

[0004] In the power supply and distribution system, AC SSPCs are increasingly widely used as the execution devices for system power distribution. The acquisition of the working voltage parameters of the AC SSPC is essential. For the AC SSPC, acquiring the AC voltages at the input and output ends is an important logical judgment basis for power supply and distribution to the rear-end load, ensuring the stable and reliable operation of the rear-end load within the normal working voltage range.

[0005] The current method for AC voltage acquisition generally uses a transformer. The AC voltage to be acquired is used to collect the analog small voltage signal output from the secondary side through the different turns ratio of the primary side and the secondary side of the transformer. The processor collects the analog small voltage signal and then calculates the primary side AC voltage inversely according to the turns ratio. This method of using a transformer to acquire AC voltage not only makes the volume of the acquisition circuit relatively large, but also has the disadvantages of low acquisition accuracy and poor safety.

[0006] Therefore, a technical solution is needed that can reduce the volume of the acquisition circuit while achieving voltage acquisition, and improve the acquisition accuracy and safety of the sampling circuit. Summary of the Invention

[0007] The present invention aims to provide an isolation voltage acquisition circuit device for an AC solid state power controller, which can reduce the volume of the acquisition circuit while achieving voltage acquisition, and improve the acquisition accuracy and safety of the sampling circuit.

[0008] According to one aspect of the present invention, there is provided an isolation voltage acquisition circuit device for an AC solid state power controller, including:

[0009] An AC voltage acquisition unit for realizing voltage acquisition of an AC solid state power controller;

[0010] An isolation power supply unit for providing an isolated power supply for the AC voltage acquisition unit;

[0011] A power supply unit for providing a power supply for the AC voltage acquisition unit;

[0012] A reference voltage unit for providing a reference voltage for the AC voltage acquisition unit;

[0013] Among them, the AC voltage acquisition unit includes a first power input port, a second power input port, a first reference voltage input port, a sampling output port, a first AC voltage acquisition terminal, and a second AC voltage acquisition terminal; the isolation power supply unit includes an isolation power supply output port, and the isolation power supply output port of the isolation power supply unit is electrically connected to the first power input port of the AC voltage acquisition unit; the power supply unit includes a power supply output port, and the power supply output port is electrically connected to the second power input port of the AC voltage acquisition unit; the reference voltage unit has a reference voltage output port, and the reference voltage output port of the reference voltage unit is electrically connected to the first reference voltage input port of the AC voltage acquisition unit, and the first AC voltage acquisition terminal and the second AC voltage acquisition terminal of the AC voltage acquisition unit are respectively electrically connected to both ends of the AC voltage line to be sampled.

[0014] According to some embodiments, the AC voltage acquisition unit includes a power-off safety detection module, a voltage sampling circuit module, a low-pass filter module, and a reference voltage module;

[0015] Among them, the input end of the power-off safety detection module is electrically connected to the first power input port, and the output end of the power-off safety detection module is respectively electrically connected to the low-pass filter module and the voltage sampling circuit module to supply power to the low-pass filter module and the voltage sampling circuit module;

[0016] The voltage sampling circuit module has a first sampling terminal, a second sampling terminal, a reference voltage input terminal, and a signal output end. The first sampling terminal is electrically connected to the first AC voltage acquisition terminal, the second sampling terminal is electrically connected to the second AC voltage acquisition terminal, the reference voltage input terminal is electrically connected to the output end of the reference voltage module, and the signal output end is electrically connected to the input port of the low-pass filter module to transmit the acquired voltage signal to the low-pass filter module;

[0017] The output port of the low-pass filter module is electrically connected to the sampling output port;

[0018] The input end of the reference voltage module is electrically connected to the first reference voltage input port, and the output port of the reference voltage module is electrically connected to the input port of the low-pass filter module.

[0019] According to some embodiments, the voltage sampling circuit module includes a sampling resistor for collecting AC voltage.

[0020] According to some embodiments, the voltage sampling circuit module further includes a voltage-dividing resistor, which is connected in series with the sampling resistor in the voltage sampling circuit module to share the AC voltage.

[0021] According to some embodiments, the voltage sampling circuit module further includes an AC input high impedance, which is connected in series in the voltage sampling circuit module to reduce the influence on the circuit under test.

[0022] According to some embodiments, the voltage sampling circuit module further includes a high-speed analog-to-digital converter.

[0023] According to some embodiments, the voltage sampling circuit module further includes an isolation operational amplifier.

[0024] According to some embodiments, the isolated power supply unit is a DC power supply circuit containing an isolated power supply chip.

[0025] According to some embodiments, the reference voltage unit is a reference voltage output circuit containing a reference voltage source chip.

[0026] According to another aspect of the present invention, there is provided a chip circuit capable of implementing the device of any one of the above.

[0027] According to the embodiments of the present invention, by using an isolated power supply unit to supply power to the AC voltage acquisition unit, the safety of the sampling circuit itself is enhanced. By using an AC input high impedance in the AC voltage acquisition unit, the influence on the original circuit is reduced, and the voltage acquisition accuracy is improved. The voltage acquisition is carried out by using a sampling resistor in combination with a voltage-dividing resistor, which reduces the space volume of the actual circuit, enabling the circuit design of the present invention to be applied to a wider range of actual scenarios. By using an isolation operational amplifier in the AC voltage acquisition unit, the reliability of the AC solid-state power controller power distribution system is improved, thereby ensuring the stable and reliable operation of the subsequent power-consuming equipment.

[0028] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments.

[0030] Figure 1The device block diagram of an AC solid-state power controller isolation voltage acquisition circuit device according to an exemplary embodiment is shown.

[0031] Figure 2 The device block diagram of an AC acquisition unit according to an exemplary embodiment is shown.

[0032] Figure 3 The device schematic diagram of a voltage sampling circuit module according to an exemplary embodiment is shown.

[0033] Figure 4 The device schematic diagram of an isolation power supply unit according to an exemplary embodiment is shown.

[0034] Figure 5 The device schematic diagram of a reference voltage unit according to an exemplary embodiment is shown. Detailed implementation manners

[0035] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar parts, and thus their repetitive description will be omitted.

[0036] In addition, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present invention. However, those skilled in the art will realize that the technical solutions of the present invention can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the present invention.

[0037] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0038] The flowcharts shown in the drawings are only illustrative and do not necessarily include all the contents and operations / steps, nor do they necessarily have to be executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to the actual situation.

[0039] It should be understood that although terms such as first, second, and third may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Thus, the first component discussed below may be referred to as the second component without departing from the teachings of the inventive concept. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present invention are all information and data that have been authorized by the user or fully authorized by all parties. And the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions, and corresponding operation entrances are provided for users to choose to authorize or reject.

[0041] Those skilled in the art can understand that the drawings are only schematic diagrams of exemplary embodiments, and the modules or processes in the drawings are not necessarily essential for implementing the present invention, so they cannot be used to limit the protection scope of the present invention.

[0042] In the power supply and distribution system, AC SSPCs are increasingly widely used as the execution devices for system power distribution. It is essential to collect the working voltage parameters of AC SSPCs. For AC SSPCs, collecting the AC voltages at the input and output ends is an important logical determination basis for power supply and distribution to the backend load, ensuring the stable and reliable operation of the backend load within the normal working voltage range.

[0043] Currently, the AC voltage acquisition method generally adopts the mutual inductor method. The AC voltage to be collected is used to collect the analog small voltage signal output by the secondary side through the different turns ratio of the primary side and the secondary side of the mutual inductor, and the processor collects the analog small voltage signal and then calculates the primary side AC voltage inversely according to the turns ratio. This method of using a mutual inductor to collect AC voltage not only makes the volume of the acquisition circuit relatively large, but also has the disadvantages of low acquisition accuracy and poor safety.

[0044] Therefore, this paper proposes a method for collecting AC voltage by using a small-volume chip-level isolated power supply, an isolated AC voltage acquisition operational amplifier, and a corresponding reference source. This method has the characteristics of small volume, high acquisition accuracy, and high reliability, provides an ideal solution for module-level AC SSPC voltage acquisition, improves the reliability of the AC SSPC power distribution system, and thus ensures the stable and reliable operation of the subsequent power-consuming equipment.

[0045] To this end, the present invention proposes an AC SSPC isolation acquisition circuit, which can reduce the volume of the acquisition circuit while realizing voltage acquisition, and improve the acquisition accuracy and safety of the sampling circuit. According to an embodiment, an AC input high impedance is adopted in the AC voltage acquisition unit to reduce the influence on the original circuit and improve the voltage acquisition accuracy. The method of applying a sampling resistor in combination with a voltage-dividing resistor for voltage sampling reduces the space volume of the actual circuit, enabling the circuit design of the present invention to be applied to a wider range of actual scenarios. By using an isolated power supply unit to supply power to the AC voltage acquisition unit, the safety of the sampling circuit itself is enhanced, and an isolated operational amplifier is adopted in the AC voltage acquisition unit to improve the reliability of the AC SSPC power distribution system, thereby ensuring the stable and reliable operation of the subsequent power-consuming devices.

[0046] Before describing the embodiments of the present application, some terms or concepts related to the embodiments of the present application are explained.

[0047] A Solid State Power Controller (SSPC for short) is a solid-state power distribution device that takes semiconductor power tubes as the core and integrates the switching function of a relay and the protection function of a circuit breaker.

[0048] The exemplary embodiments of the present invention are described below with reference to the accompanying drawings.

[0049] Figure 1 A device block diagram of an AC solid state power controller isolation voltage acquisition circuit device according to an exemplary embodiment is shown.

[0050] See Figure 1 , a device diagram of an AC solid state power controller isolation voltage acquisition circuit device is shown in the figure, including:

[0051] An AC voltage acquisition unit 101 for realizing the voltage acquisition of the AC solid state power controller.

[0052] According to some embodiments, the AC voltage acquisition unit 101 includes a first AC voltage acquisition terminal and a second AC voltage acquisition terminal. The AC voltage acquisition unit 101 is connected in parallel with the circuit to be sampled and / or the electrical device to be sampled by electrically connecting the first AC voltage acquisition terminal and the second AC voltage acquisition terminal to both ends of the circuit to be sampled and / or the electrical device to be sampled, and performs voltage acquisition.

[0053] An isolated power supply unit 103 for providing an isolated power supply for the AC voltage acquisition unit 101.

[0054] According to some embodiments, after converting the input power supply into an isolated voltage source, the isolated power supply unit 103 outputs electrical energy to provide an isolated power supply for the AC voltage acquisition unit.

[0055] A power supply unit 104 provides a power supply for the AC voltage acquisition unit.

[0056] According to some embodiments, the AC voltage acquisition unit contains an isolation operational amplifier. The isolation power supply unit 103 provides an isolated voltage source for the primary side circuit of the isolation operational amplifier, and the power supply unit 104 supplies power to the secondary side circuit of the isolation operational amplifier.

[0057] A reference voltage unit 105 provides a reference voltage for the AC voltage acquisition unit 101.

[0058] According to some embodiments, the reference voltage unit 105 is used to generate a reference voltage and output it to the AC voltage acquisition unit 101, providing a reference voltage signal for the isolation operational amplifier and the low-pass filter module inside the AC voltage acquisition unit 101.

[0059] See Figure 1 , the AC voltage acquisition unit 101 includes a first power input port 10101, a second power input port 101011, a first reference voltage input port 10103, a sampling output port 10105, and a first AC voltage acquisition terminal 10107 and a second AC voltage acquisition terminal 10109.

[0060] The isolation power supply unit 103 includes an isolation power supply output port, and the isolation power supply output port of the isolation power supply unit 103 is electrically connected to the first power input port 10101 of the AC voltage acquisition unit 101.

[0061] The power supply unit 104 includes a power supply output port, and the power supply output port is electrically connected to the second power input port 10111 of the AC voltage acquisition unit 101.

[0062] According to some embodiments, the isolation power supply unit 103 includes an isolation power supply output port, and the isolation power supply output port of the isolation power supply unit 103 is electrically connected to the first power input port 10101 of the AC voltage acquisition unit 101. The isolation power supply unit 103 outputs an isolated power supply to the AC voltage acquisition unit 101 through the isolation power supply output port. The power supply unit 104 includes a power supply output port, and the power supply output port is electrically connected to the second power input port 10111 of the AC voltage acquisition unit 101. The AC voltage acquisition unit 101 contains an isolation operational amplifier. The isolation power supply unit 103 provides an isolated power supply for the primary side circuit of the isolation operational amplifier, and the power supply unit 104 provides a power supply for the secondary side circuit of the isolation operational amplifier.

[0063] The reference voltage unit 105 has a reference voltage output port, and the reference voltage output port of the reference voltage unit 105 is electrically connected to the first reference voltage input port 10103 of the AC voltage acquisition unit 101.

[0064] According to some embodiments, the reference voltage unit 105 has a reference voltage output port, and the reference voltage output port of the reference voltage unit 105 is electrically connected to the first reference voltage input port 10103 of the AC voltage acquisition unit 101, and outputs a reference voltage signal to the AC voltage acquisition unit 101.

[0065] The first AC voltage acquisition terminal 10107 and the second AC voltage acquisition terminal 10109 of the AC voltage acquisition unit 101 are respectively electrically connected to both ends of the AC voltage line to be sampled.

[0066] According to some embodiments, the first AC voltage acquisition terminal 10107 and the second AC voltage acquisition terminal 10109 of the AC voltage acquisition unit 101 are respectively electrically connected to both ends of the AC voltage line to be sampled, and are connected in parallel with the AC voltage line to be sampled in the circuit for voltage acquisition.

[0067] Figure 2 The device block diagram of the AC acquisition unit according to an exemplary embodiment is shown.

[0068] See Figure 2 , the AC voltage acquisition unit 101 includes a power-down safety detection module 1011, a voltage sampling circuit module 1013, a low-pass filter module 1015, and a reference voltage module 1017.

[0069] As Figure 2 shown, the input end of the power-down safety detection module 1011 is electrically connected to the first power input port 10101, and the output end of the power-down safety detection module 1011 is respectively electrically connected to the low-pass filter module 1015 and the voltage sampling circuit module 1013 to supply power to the low-pass filter module 1015 and the voltage sampling circuit module 1013.

[0070] According to some embodiments, the input end of the power-down safety detection module 1011 is electrically connected to the first power input port 10101 to receive the isolated power supply provided by the isolated power supply unit. The output end of the power-down safety detection module 1011 is respectively electrically connected to the low-pass filter module 1.015 and the voltage sampling circuit module 1013 to supply power to the low-pass filter module 1015 and the voltage sampling circuit module 1013.

[0071] According to some embodiments, the power-down safety detection module 1011 can use a battery backup power supply or an uninterruptible power supply (UPS), and install an automatic transfer switch, etc. As a key safeguard measure, the power-down safety detection module 1011 can effectively prevent problems such as system failures caused by power failures or power-downs, and ensure the reliability of the voltage acquisition circuit.

[0072] The voltage sampling circuit module 1013 has a first sampling terminal 10131, a second sampling terminal 10133, a reference voltage input terminal 10135, and a signal output terminal 10137. The first sampling terminal 10131 is electrically connected to the first AC voltage acquisition terminal 10107, the second sampling terminal 10133 is electrically connected to the second AC voltage acquisition terminal 10109, the reference voltage input terminal 10135 is electrically connected to the output terminal of the reference voltage module, and the signal output terminal 10137 is electrically connected to the input port of the low-pass filter module, and transmits the acquired voltage signal to the low-pass filter module.

[0073] According to some embodiments, the voltage sampling circuit module 1013 has a first sampling terminal 10131, a second sampling terminal 10133, a reference voltage input terminal 10135, and a signal output terminal 10137. The first sampling terminal 10131 is electrically connected to the first AC voltage acquisition terminal 10107, the second sampling terminal 10133 is electrically connected to the second AC voltage acquisition terminal 10109. The voltage sampling circuit module 1013 collects and processes the voltage signal by receiving the voltage signals from the first AC voltage acquisition terminal 10107 and the second AC voltage acquisition terminal 10109.

[0074] The reference voltage input terminal 10135 is electrically connected to the output terminal of the reference voltage module 1017, and the signal output terminal 10137 is electrically connected to the input port of the low-pass filter module 1015, and transmits the acquired voltage signal to the low-pass filter module 1015.

[0075] According to some embodiments, the reference voltage input terminal 10135 is electrically connected to the output terminal of the reference voltage module 1017, and receives the reference voltage signal from the reference voltage module 1017.

[0076] According to some embodiments, the signal output terminal 10137 is electrically connected to the input port of the low-pass filter module 1015, and transmits the voltage signal after acquisition and processing to the low-pass filter module 1015.

[0077] The output port of the low-pass filter module 1015 is electrically connected to the sampling output port 10105.

[0078] According to some embodiments, the output port of the low-pass filter module 1015 is electrically connected to the sampling output port 10105. The collected single-ended analog voltage signal is output for conversion by an analog-to-digital converter. After being solved by the processor, the primary side AC bus voltage is calculated inversely, so as to achieve the purpose of voltage acquisition and detection.

[0079] The input end of the reference voltage module 1017 is electrically connected to the first reference voltage input port 10103, and the output port of the reference voltage module 1017 is electrically connected to the input port of the low-pass filter module 1015.

[0080] According to some embodiments, the input end of the reference voltage module 1017 is electrically connected to the first reference voltage input port 10103 for introducing the reference voltage signal of the reference voltage unit 105. The output port of the reference voltage module 1017 is electrically connected to the input port of the low-pass filter module 1015 to provide a reference voltage signal for the low-pass filter module.

[0081] Figure 3 The schematic diagram of the device showing the voltage sampling circuit module according to an exemplary embodiment.

[0082] See Figure 3 , the voltage sampling circuit module 1013 includes a sampling resistor R3 for collecting AC voltage.

[0083] The voltage sampling circuit module 1013 further includes a voltage-dividing resistor R4, which is connected in series with the sampling resistor in the voltage sampling circuit module to share the AC voltage.

[0084] According to some embodiments, as Figure 3 shown, the two ends of the first sampling terminal 10131 and the second sampling terminal 10133 are connected to both ends of the circuit to be sampled for collecting voltage signals. The sampling resistor R3 and the voltage-dividing resistor R4 are connected in parallel with both ends of the circuit to be sampled. The sampling resistor is used to feedback the voltage signal to the acquisition circuit, and the voltage-dividing resistor R4 is used to share the AC voltage.

[0085] According to an exemplary embodiment, when collecting 115VAC AC voltage, the Rsense sampling resistor R3 can be selected as 5.1KΩ / 0603 (≤10KΩ), R2 as 10Ω / 0603. According to the voltage division principle, the voltage across the sampling resistor R3 is set to ±1V. According to the resistor nominal value and calculation, R4 is 816KΩ / 2512, and then according to the formula, R1 = R4 / Rsense(R3)+R2 = 5078.32Ω, and R1 is taken as 5.1KΩ / 0603; C5 is 100pF / 0603 / 50V.

[0086] See Figure 3, the voltage sampling circuit module 1013 further includes an AC input high impedance 10139, which is connected in series in the voltage sampling circuit module to reduce the impact on the circuit under test.

[0087] According to some embodiments, the higher the input impedance, the less power the circuit absorbs from the output of the previous stage circuit, which can reduce the impact on the AC SSPC circuit. During the sampling process, minimizing the impact on the AC SSPC circuit can not only increase the reliability of the design solution but also improve the sampling accuracy. The AC input high impedance usually uses a differential method to transmit signals, which means it uses the voltage difference between two lines as the input signal. This method can effectively eliminate noise and other interferences and ensure a good common-mode rejection ratio. Ideally, the subsequent circuit driven by voltage only draws voltage from the previous stage without current, so it does not draw power. For the previous stage, it is almost no-load. Therefore, the larger the impedance, the easier it is to drive.

[0088] See Figure 3 , the voltage sampling circuit module 1013 further includes a high-speed analog-to-digital converter 101311.

[0089] According to some embodiments, the high-speed analog-to-digital converter 1013 is an electronic device that can convert continuous analog signals into discrete digital signals at a very high speed. One of the main features of the high-speed analog-to-digital converter 1013 is that it can perform a large amount of data conversion in a short time. This makes them very suitable for processing signals that require fast response, such as video, audio, and other real-time signals. In addition, the high-speed analog-to-digital converter 1013 usually also includes a variety of built-in functions, such as a sample-and-hold circuit, a synchronous multiplexer, a reference voltage source, and so on. These functions can help simplify the overall design of the system and improve performance and reliability.

[0090] According to some embodiments, the voltage sampling circuit module 1013 further includes an oscillator that can generate periodic electrical signals. This periodic signal is usually called an "oscillation" signal and is supplied to the high-speed analog-to-digital converter for use. There are various types of oscillators to choose from, including RC oscillators, LC oscillators, crystal oscillators, voltage-controlled oscillators, temperature-controlled oscillators, etc., which can be adaptively selected according to different application scenarios.

[0091] See Figure 3 , the voltage sampling circuit module 1013 further includes an isolation operational amplifier 101313.

[0092] According to some embodiments, the isolation operational amplifier 101313 can achieve electrical isolation between the input and output, avoiding mutual interference between the two-stage circuits. And while achieving electrical isolation, it reduces the ground noise of the system and improves the signal-to-noise ratio. Moreover, it can also amplify the input signal to increase the signal strength.

[0093] According to some embodiments, there are various types of current isolation operational amplifiers available for selection, such as optocoupler isolation, transformer isolation, differential amplifier isolation, magnetic coupling isolation, etc. In the present invention, transformer isolation can be selected to achieve efficient isolation and amplification of digital signals. In practical applications in specific scenarios, the type of isolation operational amplifier can be flexibly selected according to the differences in the sampled circuit and the surrounding electromagnetic environment.

[0094] According to some embodiments, in this design, the primary circuit and the secondary circuit of the isolation operational amplifier 101313 are respectively powered. The primary circuit of the isolation operational amplifier 101313 is supplied with an isolated power supply by the isolation power supply unit 103, and the secondary circuit of the isolation operational amplifier is supplied with a power supply by the power supply unit 104.

[0095] Figure 4 The schematic diagram of the device of the isolation power supply unit according to an exemplary embodiment is shown.

[0096] See Figure 4 , the isolation power supply unit is a DC power supply circuit containing an isolation power supply chip U1.

[0097] According to some embodiments, the isolation power supply chip U1 in the figure is the on-chip isolation power supply part of a high-performance digital isolator integrating a high-efficiency and low-radiation DCDC converter. A 5V power supply is input to its chip, and an isolated 5V power supply is output on the output side. Only the corresponding input and output capacitors need to be provided on the input and output sides to work stably and reliably. The isolated 5V power supply powers the primary side of the isolation operational amplifier.

[0098] According to some exemplary embodiments, Figure 4 in the isolation power supply chip, SOIC-16WB can be selected. This chip is small in size, low in power consumption, and high in integration efficiency. The bias input terminal (VDD pin) of the isolation power supply chip supplies the positive terminal of the 5V power supply, and the bias input ground terminal (GNDA pin) supplies the negative terminal of the 5V power supply. The input capacitors C1 and C2 can respectively select ceramic capacitors 10uF / 0805 / 50V and 0.1uF / 0603 / 50V; on the output side, the isolated output terminal (VISO pin) outputs the positive terminal of the 5VISO isolated power supply, and the output ground terminal (GNDB pin) is the negative terminal of the 5VISO power supply. The output capacitors C3 and C4 can also select ceramic capacitors 0.1uF / 0603 / 50V and 10uF / 0805 / 50V in the same way.

[0099] Figure 5 The schematic diagram of the device of the reference voltage unit according to an exemplary embodiment is shown.

[0100] See Figure 5 , the reference voltage unit is a reference voltage output circuit containing a reference voltage source chip U2.

[0101] According to some embodiments, the block diagram of the working principle of the reference voltage source chip U2 is shown in the figure. The reference voltage source chip U2 is supplied with a bias 5V power supply, and the output is a 1.25V reference voltage, which provides a reference voltage for the secondary reference input pin of the isolation op-amp.

[0102] According to some embodiments, Figure 5 For the reference voltage source chip U2, a CMOS voltage reference source CLREF-TA12DB chip in SOT23-3 package can be selected, which has the characteristics of high precision, low noise, and low temperature drift. The bias input terminal (IN pin) of the reference voltage source chip is supplied with the positive terminal of the 5V power supply, and the bias input ground terminal (GND pin) is supplied with the negative terminal of the 5V power supply. The input capacitor C1 can correspondingly select a ceramic capacitor of 10uF / 0805 / 25V; the output terminal (OUT pin) outputs a 1.25V reference voltage, and the output ground terminal is common negative with the power negative terminal. The output capacitor C2 selects a ceramic capacitor of 0.1uF / 0603 / 50V.

[0103] According to some embodiments, the ceramic capacitor uses a capacitor ceramic with a high dielectric constant as the dielectric, and silver is plated on the ceramic by the firing and infiltration method as the electrode to make a special capacitor. Since the dielectric material of the capacitor is ceramic, it not only has good heat resistance, is not easy to age, but also can resist the corrosion of acids, alkalis, and salts, and has good insulation performance and low price, enhancing the safety of the circuit.

[0104] According to some embodiments, the present invention designs a chip circuit that can achieve the above-described various functions, can reduce the volume of the acquisition circuit while realizing the voltage acquisition of the AC SSPC, and improve the acquisition accuracy and safety of the sampling circuit.

[0105] According to some embodiments, the design of the present invention adopts a high impedance for AC input to reduce the influence on the original circuit and improve the voltage acquisition accuracy. The voltage sampling is carried out by applying the method of sampling resistors in combination with voltage dividing resistors, reducing the space volume of the actual circuit, so that the circuit design of the present invention can be applied to a wider range of actual scenarios.

[0106] According to some embodiments, the design of the present invention supplies power to the AC voltage acquisition unit by adopting an isolated power supply unit, enhancing the safety of the sampling circuit itself. An isolation op-amp is adopted in the AC voltage acquisition unit to improve the reliability of the AC SSPC power distribution system, thereby ensuring the stable and reliable operation of the subsequent electrical equipment.

[0107] Those skilled in the art can clearly understand that the technical solution of the present invention can be realized by means of software and / or hardware. The "units" and "modules" in this specification refer to software and / or hardware that can complete specific functions independently or in cooperation with other components, where the hardware can be, for example, a field programmable gate array, an integrated circuit, etc.

[0108] It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should be aware that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0109] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0110] In several embodiments provided by the present invention, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some service interfaces. The indirect couplings or communication connections of devices or units can be in electrical or other forms.

[0111] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place, or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0112] In addition, the functional units in each embodiment of the present invention can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0113] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in each embodiment of the present invention.

[0114] In the above embodiments, the descriptions of the respective embodiments each have their own emphasis. For parts not elaborated in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0115] The above has specifically shown and described exemplary embodiments of the present invention. It should be understood that the present invention is not limited to the detailed structures, arrangements or implementation methods described herein; rather, the present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. An isolation voltage acquisition circuit device for an AC solid-state power controller, characterized in that, it includes: An AC voltage acquisition unit for implementing voltage acquisition of the AC solid-state power controller; An isolation power supply unit for providing an isolated power supply for the AC voltage acquisition unit; A power supply unit for providing a power supply for the AC voltage acquisition unit; A reference voltage unit for providing a reference voltage for the AC voltage acquisition unit; Wherein, the AC voltage acquisition unit includes a first power input port, a second power input port, a first reference voltage input port, a sampling output port, and a first AC voltage acquisition terminal and a second AC voltage acquisition terminal; the isolation power supply unit includes an isolation power supply output port, and the isolation power supply output port of the isolation power supply unit is electrically connected to the first power input port of the AC voltage acquisition unit; the power supply unit includes a power supply output port, and the power supply output port of the power supply unit is electrically connected to the second power input port of the AC voltage acquisition unit; the reference voltage unit has a reference voltage output port, and the reference voltage output port of the reference voltage unit is electrically connected to the first reference voltage input port of the AC voltage acquisition unit, and the first AC voltage acquisition terminal and the second AC voltage acquisition terminal of the AC voltage acquisition unit are respectively electrically connected to both ends of the AC voltage line to be sampled.

2. The device according to claim 1, characterized in that, the AC voltage acquisition unit includes a power-down safety detection module, a voltage sampling circuit module, a low-pass filter module, and a reference voltage module; Wherein, the input end of the power-down safety detection module is electrically connected to the first power input port, and the output end of the power-down safety detection module is respectively electrically connected to the low-pass filter module and the voltage sampling circuit module to supply power to the low-pass filter module and the voltage sampling circuit module; The voltage sampling circuit module has a first sampling terminal, a second sampling terminal, a reference voltage input terminal, and a signal output end. The first sampling terminal is electrically connected to the first AC voltage acquisition terminal, the second sampling terminal is electrically connected to the second AC voltage acquisition terminal, the reference voltage input terminal is electrically connected to the output end of the reference voltage module, and the signal output end is electrically connected to the input port of the low-pass filter module to transmit the acquired voltage signal to the low-pass filter module; The output port of the low-pass filter module is electrically connected to the sampling output port; The input end of the reference voltage module is electrically connected to the first reference voltage input port, and the output port of the reference voltage module is electrically connected to the input port of the low-pass filter module.

3. The device according to claim 2, characterized in that, the voltage sampling circuit module includes a sampling resistor for AC voltage acquisition.

4. The device according to claim 2, characterized in that, the voltage sampling circuit module further includes a voltage-dividing resistor connected in series with the sampling resistor in the voltage sampling circuit module for sharing the AC voltage.

5. The device according to claim 2, characterized in that, The voltage sampling circuit module further includes an AC input high impedance, which is connected in series in the voltage sampling circuit module to reduce the impact on the circuit under test.

6. The device according to claim 2, wherein, the voltage sampling circuit module further includes a high-speed analog-to-digital converter.

7. The device according to claim 2, wherein, the voltage sampling circuit module further includes an isolation operational amplifier.

8. The device according to claim 1, wherein, the isolated power supply unit is a DC power supply circuit containing an isolated power supply chip.

9. The device according to claim 1, wherein, the reference voltage unit is a reference voltage output circuit containing a reference voltage source chip.

10. A chip circuit, wherein, it includes the device according to any one of claims 1-9.

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