Multi-voltage tracking device and power system

Abstract

The invention relates to a multi-voltage tracking device and a power system. The multi-voltage tracking device comprises a controller, a multi-voltage tracking circuit and an output circuit. The controller is connected with the first power supply and the at least one second power supply and is configured to control the first power supply to output a first voltage signal and control the second power supply to output a second voltage signal. The multi-voltage tracking circuit comprises a voltage following circuit connected with a first power supply, an amplifying circuit connected with the voltage following circuit, and a driving circuit connected with the amplifying circuit and a second power supply, and is configured to form an output voltage signal according to a first voltage signal and a second voltage signal. The output circuit is connected with the driving circuit and is configured to receive and transmit an output voltage signal, and the output voltage signal is equal to the first voltage signal. The voltage output precision and the voltage fluctuation response speed can be greatly improved, the cost is reduced, and the device is simplified.

Description

Technical Field

[0001] The present application relates to the technical field of voltage tracking, and in particular to a multi-voltage tracking device and a power system. Background Art

[0002] At present, multi-voltage tracking devices mainly achieve voltage tracking through multiple voltage sensors and connected controllers. Although these voltage sensors and controllers can monitor voltage changes in real time and adjust voltage according to the algorithms preset by the controllers, they are lacking in voltage output accuracy and are not suitable for high-precision circuits.

[0003] Although the aforementioned multi-voltage tracking device has achieved voltage tracking to a certain extent, it still has many problems. For example, when the multi-voltage tracking device processes high-voltage signals, due to the accuracy problem of the voltage sensor, it is easy to have large errors; when dealing with sudden voltage fluctuations, the multi-voltage tracking device has a slow response speed, which is easy to limit its application scope; and the multi-voltage tracking device usually needs to be equipped with multiple voltage sensors and controllers, which is easy to increase the cost and complexity of the device; and so on. Summary of the invention

[0004] Based on this, the embodiments of the present application provide a multi-voltage tracking device and a power system, which improves the voltage output accuracy while improving its following response speed during voltage fluctuations, thereby helping to expand the application scope of the device, especially for high-precision circuits, and can also effectively reduce costs and simplify the device.

[0005] In order to achieve the above-mentioned purpose, on the one hand, some embodiments of the present application provide a multi-voltage tracking device. The multi-voltage tracking device includes: a controller, a multi-voltage tracking circuit and an output circuit. The controller is connected to a first power supply and at least one second power supply, and is configured to: control the first power supply to output a first voltage signal, and control the second power supply to output a second voltage signal. The multi-voltage tracking circuit includes: a voltage follower circuit connected to the first power supply, an amplifier circuit connected to the voltage follower circuit, and a drive circuit connected to the amplifier circuit and the second power supply. The output circuit is connected to the drive circuit and is configured to: receive and transmit the output voltage signal. Among them, the voltage follower circuit is configured to: follow the first voltage signal to form a first follow voltage signal. The amplifier circuit is configured to: scale the first follow voltage signal to form a first scaled voltage signal; and, scale the second follow voltage signal to form a second scaled voltage signal. The drive circuit is configured to: follow the output voltage signal to form a second follow voltage signal, and transmit the second follow voltage signal to the amplifier circuit; and, perform differential processing on the first scaled voltage signal and the second scaled voltage signal to form a drive signal, so as to form an output voltage signal in response to the drive signal and the second voltage signal; the output voltage signal is equal to the first voltage signal.

[0006] In some embodiments of the present application, the multi-voltage tracking device further includes a feedback circuit. The feedback circuit connects the output circuit and the controller and is configured to: collect the output voltage signal, form a feedback voltage signal, and transmit the feedback voltage signal to the controller. Accordingly, the controller is also configured to: identify a fault in response to the feedback voltage signal; and generate a shutdown control instruction in response to the fault.

[0007] In some embodiments of the present application, the voltage follower circuit is connected to the first power supply through the first switch circuit, and is also configured to: follow the first voltage signal when the first switch circuit is turned on to form a first follower voltage signal. The drive circuit is connected to the second power supply and the output circuit through the second switch circuit, and is also configured to: transmit a drive signal to the second switch circuit to control the conduction degree of the second switch circuit according to the drive signal, and enable the second switch circuit to provide an output voltage signal to the output circuit in response to the drive signal and the second voltage signal.

[0008] In some embodiments of the present application, the voltage follower circuit includes a first operational amplifier. The first operational amplifier includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin and an eighth pin. Among them, the first pin of the first operational amplifier is connected to the second pin of the first operational amplifier. The third pin of the first operational amplifier is connected to the first switch circuit, and the first switch circuit is also connected to the first power supply through a first resistor. The fourth pin of the first operational amplifier is connected to the negative voltage end of the floating power supply. The fifth pin of the first operational amplifier is connected to the reference ground of the floating power supply. The sixth pin of the first operational amplifier is connected to the seventh pin of the first operational amplifier. The eighth pin of the first operational amplifier is connected to the positive voltage end of the floating power supply.

[0009] In some embodiments of the present application, the amplification circuit includes a second operational amplifier. The second operational amplifier includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin and an eighth pin. Among them, the first pin of the second operational amplifier and the second pin of the second operational amplifier are connected in series through a first capacitor-resistance parallel circuit. The second pin of the second operational amplifier is also connected to the reference ground of the suspension power supply through a second capacitor-resistance parallel circuit. The third pin of the second operational amplifier is connected to the voltage follower circuit through a second resistor. The fourth pin of the second operational amplifier is connected to the negative voltage end of the suspension power supply. The fifth pin of the second operational amplifier is connected to the drive circuit through a third resistor. The sixth pin of the second operational amplifier and the seventh pin of the second operational amplifier are connected in series through a third capacitor-resistance parallel circuit. The sixth pin of the second operational amplifier is also connected to the reference ground of the suspension power supply through a fourth capacitor-resistance parallel circuit. The seventh pin of the second operational amplifier is also connected to the drive circuit through a fourth resistor. The eighth pin of the second operational amplifier is connected to the positive voltage end of the suspension power supply.

[0010] In some embodiments of the present application, the driving circuit includes a third operational amplifier. The third operational amplifier includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin and an eighth pin. Among them, the first pin of the third operational amplifier and the second pin of the third operational amplifier are connected in series through a fifth capacitor-resistor parallel circuit. The first pin of the third operational amplifier is also connected to the second switch circuit. The second pin of the third operational amplifier is also connected to the amplifier circuit through a fourth resistor. The third pin of the third operational amplifier is connected to the amplifier circuit through a fifth resistor. The third pin of the third operational amplifier is also connected to the reference ground of the suspension power supply through a sixth capacitor-resistor parallel circuit. The fourth pin of the third operational amplifier is connected to the negative voltage end of the suspension power supply. The fifth pin of the third operational amplifier is connected to the second switch circuit through a sixth resistor. The sixth pin of the third operational amplifier is connected to the seventh pin of the third operational amplifier. The seventh pin of the third operational amplifier is connected to the amplifier circuit through a third resistor. The eighth pin of the third operational amplifier is connected to the positive terminal of the suspension power supply.

[0011] In some embodiments of the present application, the second switch circuit includes: a switch power transistor and a first protection circuit. The first protection circuit includes an overvoltage protection circuit and a voltage-dividing current-limiting circuit. Among them, the switch power transistor includes a control end and a first end and a second end; the control end is connected to the drive circuit through a seventh resistor. The overvoltage protection circuit connects the control end and the first end of the switch power transistor. The voltage-dividing current-limiting circuit includes: an eighth resistor connecting the control end and the second end of the switch power transistor, and a ninth resistor connecting the second end and the second power supply.

[0012] In some embodiments of the present application, the second switch circuit further includes a second protection circuit. The second protection circuit is connected to the switch power transistor, the second power supply, the output circuit and the drive circuit, and is configured to perform at least one of overvoltage protection, voltage division and current limiting, voltage stabilization protection and filtering protection on the output voltage signal.

[0013] In some embodiments of the present application, the first power supply and the second power supply are both high voltage power supplies. The multi-voltage tracking device further includes: a first isolation chip connected between the controller and the first power supply, and a second isolation chip connected between the controller and the second power supply.

[0014] In some embodiments of the present application, the first switch circuit is also connected to the second power supply. The multi-voltage tracking device also includes a switch control circuit. The switch control circuit is connected to the first switch circuit and the controller, and is configured to: in response to a switch control instruction of the controller, select to turn on the first power supply and / or the second power supply.

[0015] In some embodiments of the present application, the switch control circuit includes: an optical fiber transmitter and an optical fiber receiver. The optical fiber transmitter is connected to the controller and is configured to generate an optical fiber transmission signal in response to a control instruction of the controller. The optical fiber receiver is connected to the first switch circuit and is configured to receive the optical fiber transmission signal and generate a switch control instruction according to the optical fiber transmission signal.

[0016] On the other hand, some embodiments of the present application further provide a power system, comprising a multi-voltage tracking device as described in any of the above embodiments.

[0017] The embodiments of the present application may or at least have the following advantages:

[0018] In the embodiment of the present application, by connecting the controller and the multi-voltage tracking circuit of the first power supply and the second power supply, the multi-voltage tracking circuit can form an output voltage signal according to the first voltage signal provided by the first power supply and the second voltage signal provided by the second power supply, and ensure that the output circuit outputs an output voltage signal equal to the first voltage signal. In this way, for the voltage signals provided by multiple power supplies, compared with the problem that a voltage sensor and a controller are set for each power supply in the related art, and the voltage sensor has a range error and the power supply has a temperature drift, the multi-voltage tracking device provided in the embodiment of the present application not only does not need to set a voltage sensor and can greatly reduce the number of controllers, so as to reduce costs and simplify the device, but also can take the temperature drift of the power supply into account, and track and accurately output the first voltage signal provided by the target power supply (i.e., the first power supply) in real time, so as to effectively improve the voltage output accuracy and the follow-up response speed when the voltage fluctuates, thereby helping to expand the application scope of the multi-voltage tracking device, especially for high-precision circuits with high-voltage output.

[0019] The details of one or more embodiments of the present application are set forth in the following drawings and description. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a structural block diagram of a multi-voltage tracking device provided in some embodiments;

[0022] Figure 2 is a structural block diagram of another multi-voltage tracking device provided in some embodiments;

[0023] Figure 3 is a structural block diagram of another multi-voltage tracking device provided in some embodiments;

[0024] Figure 4 is a structural block diagram of another multi-voltage tracking device provided in some embodiments;

[0025] Figure 5 for Figure 4 A circuit schematic diagram of a multi-voltage tracking device shown;

[0026] Figure 6 A circuit schematic diagram of a controller connected to a first power source and a second power source provided in some embodiments;

[0027] Figure 7 A circuit schematic diagram of a switch control circuit provided in some embodiments.

[0028] Description of reference numerals:

[0029] 10-controller, 20-multi-voltage tracking circuit, 201-first switching circuit, 202-voltage following circuit, 203-amplifier circuit, 204-drive circuit, 205-second switching circuit, 30-output circuit, 40-first power supply, 50-second power supply, 60-feedback circuit, 601-voltage acquisition circuit, 602-feedback processing circuit, 251-overvoltage protection circuit, 252-voltage dividing and current limiting circuit, 70-switch control circuit, 71-optical fiber transmitter, 72-optical fiber receiver, 81-first isolation chip, 82-second isolation chip. DETAILED DESCRIPTION

[0030] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0032] It should be understood that when an element or layer is referred to as being "on," "adjacent to," or "connected to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, doping types, and / or portions, these elements, components, regions, layers, doping types, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, doping type, or portion from another element, component, region, layer, doping type, or portion. Therefore, without departing from the teachings of the present application, the first element, component, region, layer, doping type, or portion discussed below may be represented as a second element, component, region, layer, or portion.

[0033] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that when the terms "consisting of" and / or "comprising" are used in this specification, the presence of the features, integers, steps, operations, elements and / or parts can be determined, but the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups is not excluded. At the same time, when used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0034] Some embodiments of the present application provide a multi-voltage tracking device. Figure 1 The multi-voltage tracking device includes: a controller 10, a multi-voltage tracking circuit 20 and an output circuit 30. The controller 10 is connected to a first power supply 40 and at least one second power supply 50, and is configured to: control the first power supply 40 to output a first voltage signal, and control the second power supply 50 to output a second voltage signal. The multi-voltage tracking circuit 20 is connected to the first power supply 40 and the second power supply 50, and is configured to: form an output voltage signal according to the first voltage signal and the second voltage signal. The output circuit 30 is connected to the multi-voltage tracking circuit 20, and is configured to: receive and transmit the aforementioned output voltage signal, which is equal to the first voltage signal.

[0035] Here, the output voltage signal is equal to the first voltage signal, including: the voltage values ​​of the two are the same, and the deviation value of the two voltages is within the permissible range of error precision. The permissible range of error precision can be selected and set according to the requirements, and the embodiment of the present application does not limit this.

[0036] Optionally, the first power supply 40 and the second power supply 50 include but are not limited to high voltage power supplies. The high voltage mentioned here and hereinafter refers to a voltage with a voltage level lower than (-1000V), for example, a high voltage with a voltage level in the range of (-10)KV to (-50)KV (including the endpoints).

[0037] Optionally, the controller 10 includes but is not limited to a micro controller unit (MCU).

[0038] Optionally, the multi-voltage tracking circuit 20 is further connected to the controller 10 , and the multi-voltage tracking circuit 20 is configured to: respond to a control instruction of the controller 10 , and form an output voltage signal according to the first voltage signal and the second voltage signal.

[0039] In the embodiment of the present application, by connecting the controller 10 and the multi-voltage tracking circuit 20 of the first power supply 40 and the second power supply 50, the multi-voltage tracking circuit 20 can form an output voltage signal according to the first voltage signal provided by the first power supply 40 and the second voltage signal provided by the second power supply 50, and ensure that the output circuit 30 outputs an output voltage signal equal to the first voltage signal. In this way, for the voltage signals provided by multiple power supplies, compared with the problem that a voltage sensor and a controller are set for each power supply in the related art, and the voltage sensor has a range error and the power supply has a temperature drift, the multi-voltage tracking device provided in the embodiment of the present application not only does not need to set a voltage sensor and can greatly reduce the number of controllers, so as to reduce costs and simplify the device, but also can take the temperature drift of the power supply into consideration, and track and accurately output the first voltage signal provided by the target power supply (i.e., the first power supply 40) in real time, so as to effectively improve the voltage output accuracy and the follow-up response speed when the voltage fluctuates, thereby helping to expand the application scope of the multi-voltage tracking device, especially for high-precision circuits with high-voltage output.

[0040] In addition, the multi-voltage tracking device provided in the embodiment of the present application has a modular design function, that is, the number and type of multi-voltage tracking circuits 20 and controllers 10 can be flexibly configured according to actual needs to achieve a balance between cost and performance. Exemplarily, the multi-voltage tracking device can include only one multi-voltage tracking circuit 20 and one controller 10 to meet the needs of high-precision circuits.

[0041] In some embodiments of this application, please refer to Figure 2 The multi-voltage tracking device further includes a feedback circuit 60. The feedback circuit 60 connects the output circuit 30 and the controller 10, and is configured to: collect the output voltage signal, form a feedback voltage signal, and transmit the feedback voltage signal to the controller 10. Accordingly, the controller 10 is also configured to: identify a fault in response to the feedback voltage signal; and generate a shutdown control instruction in response to the fault.

[0042] Here, the fault includes a power supply (eg, the first power supply 40 and / or the second power supply 50 ) fault or a multi-voltage tracking circuit 20 fault.

[0043] In the embodiment of the present application, the output voltage signal can be collected as a feedback voltage signal through the feedback circuit 60, and the feedback voltage signal can be transmitted to the controller 10, so that the controller 10 can identify the fault in response to the feedback voltage signal, and can generate a shutdown control instruction in response to the fault, thereby realizing closed-loop detection of the multi-voltage tracking device. In addition, when the controller 10 identifies the aforementioned fault, it can generate a shutdown control instruction to control the corresponding equipment in the power system to shut down immediately without affecting the normal operation of other equipment, thereby ensuring the stability and reliability of the multi-voltage tracking device and the power system.

[0044] In addition, optionally, the controller 10 is further configured to generate an alarm instruction in response to the fault to give an alarm. The alarm signal includes but is not limited to at least one of sound, light and electrical signals.

[0045] In some embodiments of this application, please refer to Figure 3 The feedback circuit 60 includes a voltage acquisition circuit 601 and a feedback processing circuit 602. The voltage acquisition circuit 601 is connected to the output circuit 30 and is configured to: acquire the output voltage signal of the output circuit 30. The feedback processing circuit 602 is connected to the voltage acquisition circuit 601 and the controller 10 and is configured to: receive the output voltage signal acquired by the voltage acquisition circuit 601, perform analog-to-digital conversion on the output voltage signal to form a digital signal and transmit it to the controller 10.

[0046] Here, the analog-to-digital conversion of the output voltage signal may be performed, for example, by performing multiple filtering processes on the sampled analog signal of the output voltage signal and then converting it into a digital signal.

[0047] Optionally, the voltage acquisition circuit 601 and the feedback processing circuit 602 may be integrated into an integral structure, for example, may be integrated into a continuous self-calibration analog / digital (A / D) converter or a continuous self-calibration analog / digital conversion chip.

[0048] Optionally, the continuous self-calibration analog / digital (A / D) converter or the continuous self-calibration analog / digital conversion chip may communicate using an IIC (Inter-Integrated Circuit, integrated circuit bus).

[0049] In some embodiments of this application, please combine Figure 4It is understood that the multi-voltage tracking circuit 20 includes: a voltage follower circuit 202 connected to the first power supply 40, an amplifier circuit 203 connected to the voltage follower circuit 202, and a drive circuit 204 connected to the amplifier circuit 203, the second power supply 50 and the output circuit 30. Among them, the voltage follower circuit 202 is configured to: follow the first voltage signal to form a first follow voltage signal. The amplifier circuit 203 is configured to: scale the first follow voltage signal to form a first scaled voltage signal; and, scale the second follow voltage signal to form a second scaled voltage signal. The drive circuit 204 is configured to: follow the output voltage signal to form a second follow voltage signal, and transmit the second follow voltage signal to the amplifier circuit 203; and, differentially process the first scaled voltage signal and the second scaled voltage signal to form a drive signal, so as to form an output voltage signal in response to the drive signal and the second voltage signal, and the output voltage signal is equal to the first voltage signal.

[0050] Here, the driving signal can make the circuit reach a steady state, that is, the circuit of the multi-voltage tracking device as a whole reaches a steady state.

[0051] Optionally, the voltage follower circuit 202 is connected to the first power source 40 via the first switch circuit 201 , and is further configured to: when the first switch circuit 201 is turned on, follow the first voltage signal to form a first follower voltage signal.

[0052] Optionally, the driving circuit 204 is connected to the second power supply 50 and the output circuit 30 through the second switching circuit 205, and is also configured to: transmit a driving signal to the second switching circuit 205 to control the conduction degree of the second switching circuit 205 according to the driving signal, and enable the second switching circuit 205 to provide an output voltage signal to the output circuit 30 in response to the driving signal and the second voltage signal.

[0053] In the embodiment of the present application, when the controller 10 controls the first power supply 40 and the second power supply 50 to output two high voltages respectively, the multi-voltage tracking circuit 20 needs to accurately track the first voltage signal output by the first power supply 40. The multi-voltage tracking circuit 20 adopts the aforementioned structure and can be used as a high-precision multi-voltage tracking circuit; that is, the multi-voltage tracking circuit 20 has high sensitivity and high precision, can accurately capture the influence of small voltage changes in the circuit and temperature drift on the output voltage signal, and process and absorb other redundant voltage signals other than the output voltage signal (first voltage signal). At the same time, the multi-voltage tracking circuit 20 also has strong anti-interference ability, which can effectively eliminate the influence of external noise on the output voltage signal.

[0054] It is worth mentioning that the first switch circuit 201, the voltage follower circuit 202, the amplifier circuit 203, the drive circuit 204 and the second switch circuit 205 in the multi-voltage tracking circuit 20 can be formed by connecting various types of electronic components in series and in parallel to ensure the corresponding circuit functions. The following embodiments of the present application provide some possible implementation methods by way of example.

[0055] For example, see Figure 5 The first switch circuit 201 includes but is not limited to a high-voltage relay SW1. The first switch circuit 201 is connected to the first power source 40 via a first resistor R1.

[0056] For example, see Figure 5 , the voltage follower circuit 202 includes a first operational amplifier U1. The first operational amplifier includes a first pin U1-1, a second pin U1-2, a third pin U1-3, a fourth pin U1-4, a fifth pin U1-5, a sixth pin U1-6, a seventh pin U1-7 and an eighth pin U1-8. Among them, the first pin U1-1 of the first operational amplifier U1 is connected to the second pin U1-2 of the first operational amplifier U1. The third pin U1-3 of the first operational amplifier U1 is connected to the first switch circuit 201. The fourth pin U1-4 of the first operational amplifier U1 is connected to the negative voltage terminal VEE of the floating power supply. The fifth pin U1-5 of the first operational amplifier U1 is connected to the reference ground terminal F of the floating power supply. The sixth pin U1-6 of the first operational amplifier U1 is connected to the seventh pin U1-7 of the first operational amplifier U1. The eighth pin U1-8 of the first operational amplifier U1 is connected to the positive voltage terminal VDD of the floating power supply.

[0057] For example, Figure 5 As shown in FIG. 1 , the first switch circuit 201 and the third pin U1 - 3 of the first operational amplifier U1 may be connected to the floating power supply reference ground terminal F through a resistor R18 .

[0058] In the embodiment of the present application, the voltage follower circuit 202 uses the first operational amplifier U1, which can not only effectively reduce the signal loss caused by the mismatch between the high output impedance and the low input impedance of the next stage, and play a buffering role, but also can present a high impedance to the previous stage circuit and a low impedance to the subsequent stage circuit, and play an isolation role of isolating the adjacent stage circuits to reduce the interference between the adjacent stage circuits. In addition, the voltage follower circuit 202 is connected to the first switch circuit 201 and the amplifier circuit 203, and the operational amplifier can also follow the first voltage signal to form a first follow-up voltage signal to match the impedance between the circuit stages and enhance the load capacity of the output circuit 30.

[0059] For example, please refer to Figure 5, the amplifier circuit 203 includes a second operational amplifier U2. The second operational amplifier U2 includes a first pin U2-1, a second pin U2-2, a third pin U2-3, a fourth pin U2-4, a fifth pin U2-5, a sixth pin U2-6, a seventh pin U2-7 and an eighth pin U2-8. Among them, the first pin U2-1 of the second operational amplifier U2 and the second pin U2-2 of the second operational amplifier U2 are connected in series through a first capacitor-resistor parallel circuit RC1. The second pin U2-2 of the second operational amplifier U2 is also connected to the floating power supply reference ground terminal F through a second capacitor-resistor parallel circuit RC2. The third pin U2-3 of the second operational amplifier U2 is connected to the voltage follower circuit 202 through a second resistor R2, for example, connected to the first pin U1-1 of the first operational amplifier U1. The fourth pin U2-4 of the second operational amplifier U2 is connected to the negative voltage terminal VEE of the floating power supply. The fifth pin U2-5 of the second operational amplifier U2 is connected to the drive circuit 204 through a third resistor R3. The sixth pin U2-6 of the second operational amplifier U2 is connected in series with the seventh pin U2-7 of the second operational amplifier U2 through a third capacitor-resistor parallel circuit RC3. The sixth pin U2-6 of the second operational amplifier U2 is also connected to the reference ground terminal F of the floating power supply through a fourth capacitor-resistor parallel circuit RC4. The seventh pin U2-7 of the second operational amplifier U2 is also connected to the drive circuit 204 through a fourth resistor R4. The eighth pin U2-8 of the second operational amplifier U2 is connected to the positive voltage terminal VDD of the floating power supply.

[0060] Here, the first capacitor-resistor parallel circuit RC1, the second capacitor-resistor parallel circuit RC2, the third capacitor-resistor parallel circuit RC3 and the fourth capacitor-resistor parallel circuit RC4 are all composed of corresponding resistors (for example, resistor R10, resistor R20, resistor R30, resistor R40) and capacitors (for example, capacitor C10, capacitor C20, capacitor C30, capacitor C40) connected in parallel.

[0061] For example, Figure 5 As shown in FIG. 1 , the fifth pin U2 - 5 of the second operational amplifier U2 and the third resistor R3 may be connected to the floating power supply reference ground terminal F via the resistor R19 .

[0062] In the embodiment of the present application, the amplification circuit 203 uses a second operational amplifier U2, which can match the resistor R10 and the resistor R20 to amplify or reduce the first follower voltage signal, and match the capacitor C10 and the capacitor C20 for filtering, thereby meeting the circuit requirements, forming a first scaled voltage signal, and transmitting the first scaled voltage signal to the third pin U3-3 of the third operational amplifier U3 through the fifth resistor R5 and the sixth capacitor-resistor parallel circuit RC6.

[0063] For example, please refer to Figure 5, the driving circuit 204 includes a third operational amplifier U3. The third operational amplifier U3 includes a first pin U3-1, a second pin U3-2, a third pin U3-3, a fourth pin U3-4, a fifth pin U3-5, a sixth pin U3-6, a seventh pin U3-7 and an eighth pin U3-8. Among them, the first pin U3-1 of the third operational amplifier U3 and the second pin U3-2 of the third operational amplifier U3 are connected in series through a fifth capacitor-resistor parallel circuit RC5. The first pin U3-1 of the third operational amplifier U3 is also connected to the second switch circuit 205. The second pin U3-2 of the third operational amplifier U3 is also connected to the amplifier circuit 203 through a fourth resistor R4, for example, connected to the seventh pin U2-7 of the second operational amplifier U2. The third pin U3-3 of the third operational amplifier U3 is connected to the amplifier circuit 203 through a fifth resistor R5, for example, connected to the first pin U2-1 of the second operational amplifier U2. The third pin U3-3 of the third operational amplifier U3 is also connected to the reference ground terminal F of the floating power supply through a sixth capacitor-resistor parallel circuit RC6. The fourth pin U3-4 of the third operational amplifier U3 is connected to the negative voltage terminal VEE of the floating power supply. The fifth pin U3-5 of the third operational amplifier U3 is connected to the output circuit 30 through the sixth resistor R6. The sixth pin U3-6 of the third operational amplifier U3 is connected to the seventh pin U3-7 of the third operational amplifier U3. The seventh pin U3-7 of the third operational amplifier U3 is connected to the amplification circuit 203 through the third resistor R3, for example, connected to the fifth pin U2-5 of the second operational amplifier U2. The eighth pin U3-8 of the third operational amplifier U3 is connected to the positive voltage terminal VDD of the floating power supply.

[0064] Here, the fifth capacitor-resistor parallel circuit RC5 and the sixth capacitor-resistor parallel circuit RC6 are respectively formed by connecting corresponding resistors (eg, resistor R50 and resistor R60 ) and capacitors (eg, capacitor C50 and capacitor C60 ) in parallel.

[0065] In the embodiment of the present application, the output voltage signal of the output circuit 30 can be transmitted to the fifth pin U3-5 of the third operational amplifier U3 through the resistor R6 for voltage following to form a second following voltage signal, and the second following voltage signal is transmitted to the amplifier circuit 203 (i.e., the fifth pin U2-5 of the second operational amplifier U2) through the third resistor R3, so that the amplifier circuit 203 matches the resistor R30 and the resistor R40 to amplify or reduce the second following voltage signal, and matches the capacitor C30 and the capacitor C40 for filtering, thereby meeting the circuit requirements, forming a second scaled voltage signal, and the second scaled voltage signal is transmitted to the first pin U3-1 of the third operational amplifier U3 through the fourth resistor R4 and the fifth capacitor-resistor parallel circuit RC5, thereby performing differential processing on the first scaled voltage signal and the second scaled voltage signal to form a drive signal, and transmitting the drive signal to the second switch circuit 205 to control the conduction degree of the second switch circuit 205 according to the drive signal.

[0066] In some embodiments of this application, please continue to refer to Figure 5 , the second switch circuit 205 includes: a switch power transistor Q1 and a first protection circuit. The first protection circuit includes an overvoltage protection circuit 251 and a voltage-dividing and current-limiting circuit 252. Among them, the switch power transistor Q1 includes a control end and a first end and a second end; the control end is connected to the drive circuit 204 through a seventh resistor R7, for example, connected to the first pin U3-1 of the third operational amplifier U3. The overvoltage protection circuit 251 connects the control end and the first end of the switch power transistor Q1, and the overvoltage protection circuit 251 can be, for example, a first diode D1. The voltage-dividing and current-limiting circuit 252 includes: an eighth resistor R8 connecting the control end and the second end of the switch power transistor Q1, and a ninth resistor R9 connecting the second end of the switch power transistor Q1 and the second power supply 50.

[0067] Exemplarily, the switching power transistor Q1 includes but is not limited to a MOS tube (i.e., a Metal-Oxide-Semiconductor Field Effect Transistor, Metal-Oxide-Semiconductor Field Effect Transistor, or MOSFET for short). The switching power transistor Q1 adopts a MOS tube, and can respond quickly to sudden voltage fluctuations based on the fast-response conduction technology of the MOS tube, so as to effectively improve the response speed and system stability of the electronic system. The control end of the switching power transistor Q1 is, for example, a gate end, the first end is, for example, a source end, and the second end is, for example, a drain end. In this way, the overvoltage protection circuit 251 can perform overvoltage protection on the gate-source end of the switching power transistor Q1. The voltage-dividing and current-limiting circuit 252 can perform voltage-dividing and current-limiting on the switching power transistor Q1.

[0068] In the embodiment of the present application, the driving signal formed by the driving circuit 204 can control the conduction of the switching power transistor Q1 through the seventh resistor R7 (current limiting resistor). In addition, by controlling the conduction degree of the switching power transistor Q1, the embodiment of the present application can make the output circuit 30 output an output voltage signal that is the same as the first voltage signal provided by the first power supply 40, so as to achieve 1:1 following of the output voltage signal to the first voltage signal.

[0069] In some embodiments of this application, please continue to refer to Figure 5 The second switch circuit 205 also includes a second protection circuit. The second protection circuit is connected to the switch power transistor Q1, the second power supply 50, the output circuit 30 and the drive circuit 204, and is configured to perform at least one of overvoltage protection, voltage division and current limiting, voltage stabilization protection and filtering protection on the output voltage signal.

[0070] For example, Figure 5 As shown in , the second protection circuit includes a plurality of diodes, such as a second diode D2, a third diode D3, a fourth diode D4, and a fifth diode D5, etc., and each diode can be used to perform overvoltage protection on the switching power transistor Q1 to prevent the switching power transistor Q1 from being damaged by the high voltage provided by the second power supply 50. The second protection circuit includes a plurality of inductors, such as a first inductor L1, a second inductor L2, a third inductor L3, and a fourth inductor L4, etc., and each inductor can be used to prevent current drastic changes. The second protection circuit includes a plurality of filter capacitors, such as a first filter capacitor C11, a second filter capacitor C12, a third filter capacitor C13, and a fourth filter capacitor C14, and each filter capacitor can be used to filter noise and effectively stabilize the output voltage.

[0071] In addition, if Figure 5 As shown in, the second protection circuit can also be provided with multiple voltage-divider and current-limiting resistors, such as resistor R11, resistor R12, resistor R13, resistor R14, resistor R15, resistor R16 and resistor R17, so as to ensure that the power consumption of the second switch circuit 205 is stable within a certain range through each voltage-divider and current-limiting resistor.

[0072] It is understandable that the number and specifications of each diode, each inductor, each filter capacitor and each voltage-dividing and current-limiting resistor in the second protection circuit can be set according to the requirements. The following embodiments of the present application exemplarily provide a possible implementation.

[0073] In some embodiments of this application, please refer to Figure 5, the second protection circuit includes a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a first filter capacitor C11, a second filter capacitor C12, a third filter capacitor C13, a fourth filter capacitor C14, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and a resistor R17. Among them, the cathode of the second diode D2 is connected to the anode of the fourth diode D4. The anode of the second diode D2 is connected to the voltage-dividing current-limiting circuit 252 through the first inductor L1, for example, the ninth resistor R9 is away from one end of the switching power transistor Q1. The cathode of the fourth diode D4 is connected to the first end of the power transistor Q1 through the third inductor L3. The two ends of the second diode D2 are connected in parallel with the resistor R11. The two ends of the fourth diode D4 are connected in parallel with the resistor R13. The anode of the second diode D2 and the cathode of the fourth diode D4 are connected in parallel with the first filter capacitor C11. The cathode of the third diode D3 is connected to the anode of the fifth diode D5. The anode of the second diode D2 is also connected to the first filter capacitor C11 and the second inductor L2 through the resistor R15, and the end of the second inductor L2 away from the resistor R15 is connected to the anode of the third diode D3. The cathode of the fourth diode D4 is connected to the first filter capacitor C11 and the fourth inductor L4 through the resistor R16, and the end of the fourth inductor L4 away from the resistor R16 is connected to the cathode of the fifth diode D5. The two ends of the third diode D3 are connected in parallel with the resistor R12. The two ends of the fifth diode D5 are connected in parallel with the resistor R14. The anode of the third diode D3 and the cathode of the fifth diode D5 are also connected in parallel with the second filter capacitor C12. The cathode of the fifth diode D5 is connected to the floating power supply reference ground terminal F and the output circuit 30. The end of the resistor R16 connected to the first filter capacitor C11 is also connected to the drive circuit 204 through the sixth resistor R6, for example, connected to the fifth pin U3-5 of the third operational amplifier U3, and connected to the ground PGND through the third filter capacitor C13 and the resistor R17. The third filter capacitor C13 and the resistor R17 are connected in parallel. The cathode of the fifth diode D5 is also connected to the ground PGND through the fourth filter capacitor C14.

[0074] For example, Figure 5 As shown, the ninth resistor R9 in the voltage-dividing and current-limiting circuit 252 can be connected to the second power source 50 through the first inductor L1 , the resistor R15 and the second inductor L2 connected in series in the second protection circuit.

[0075] It should be added that in some embodiments of the present application, please refer to Figure 6 The first power supply 40 and the second power supply 50 are both high voltage power supplies. The multi-voltage tracking device further includes: a first isolation chip 81 connected between the controller 10 and the first power supply 40 , and a second isolation chip 82 connected between the controller 10 and the second power supply 50 .

[0076] In the embodiment of the present application, the controller 10 does not directly control the first power supply 40 and the second power supply 50, but can perform isolation control through the first isolation chip 81 and the second isolation chip 82, effectively preventing electrical interference and magnetic signal interference, thereby protecting the power system from damage by the external environment, and at the same time helping to improve the fault tolerance and reliability of the multi-voltage tracking device and the power system.

[0077] In addition, the controller 10 performs isolation control on the first power supply 40 and the second power supply 50, and can also achieve software and hardware isolation through the memory partition mechanism and the memory protection unit (MPU) to prevent malware or viruses from invading the controller 10 and the core part of the power system, thereby improving the security of the power system and better allocating and processing the system resources of the power system to improve the overall efficiency and response speed of the power system. In addition, the controller 10 performs isolation control on the first power supply 40 and the second power supply 50, and can also eliminate the ground loop, isolate the noise, and reduce the interference of the external environment on the signal to ensure the system stability of the power system, improve the signal integrity and transmission efficiency of the power system, and thus improve the overall performance.

[0078] It can be understood that the first isolation chip 81 and the second isolation chip 82 can be selected and set to match the needs, and the embodiment of the present application does not limit this, so as to ensure that the corresponding functions are achieved.

[0079] Alternatively, if Figure 6 As shown in , the first isolation chip 81 and the second isolation chip 82 both have multiple functional pins, and can match each functional pin to connect one or more pull-up resistors and one or more pull-down resistors. For example, Figure 6 The resistors R23, R24, R27 and R28 shown in FIG. 1 are pull-up resistors. Figure 6 The resistors R25, R26, R29 and R31 shown in FIG. are pull-down resistors. The circuit connection relationship between each pull-up resistor and the pull-down resistor can be referred to Figure 6 The process is as shown and will not be described in detail here.

[0080] In some embodiments of this application, please combine Figure 5 It is understood that the first switch circuit 201 is also connected to the second power supply 50. The multi-voltage tracking device further includes a switch control circuit 70. The switch control circuit 70 is connected to the first switch circuit 201 and the controller 10, and is configured to: in response to the switch control instruction of the controller 10, select to turn on the first power supply 40 and / or the second power supply 50.

[0081] In some examples, when the controller 10 controls the first power supply 40 to output a first voltage signal and controls the second power supply 50 to output a second voltage signal, the first switch circuit 201 (e.g., high-voltage relay SW1) can simultaneously disconnect and connect the two power supplies (i.e., the first power supply 40 and the second power supply 50 and the multi-voltage tracking circuit 20).

[0082] It should be added that the first switch circuit 201 (eg, high-voltage relay SW1) is used to control the on and off of the high-voltage power supply. It has a relatively high voltage resistance and is difficult to be isolated by an optical coupler (the isolation voltage of the optical coupler is relatively low). Figure 7 In some embodiments of the present application, the switch control circuit 70 includes: an optical fiber transmitter 71 and an optical fiber receiver 72. The optical fiber transmitter 71 is connected to the controller 10 and is configured to generate an optical fiber transmission signal in response to a control instruction of the controller 10. The optical fiber receiver 72 is connected to the first switch circuit 201 (for example, the high-voltage relay SW1) and is configured to receive the optical fiber transmission signal and generate a switch control instruction according to the optical fiber transmission signal.

[0083] For example, Figure 7 As shown in FIG. 1 , the optical fiber transmitter 71 includes a transmitting chip U6, a transistor Q4, and resistors R36, R37, R41, and R42, and the circuit connection relationship thereof can be referred to Figure 7 The optical fiber transmitter 71 can convert the electrical signal into an optical signal for transmission.

[0084] For example, Figure 7 As shown in FIG. 1 , the optical fiber receiver 72 includes: a receiving chip U7, a resistor R35 and a resistor R39, and the circuit connection relationship thereof can be referred to Figure 7 The optical fiber receiver 72 can convert the received optical signal into an electrical signal.

[0085] On this basis, please continue to refer to Figure 7 The switch control circuit 70 , for example, further includes a third protection circuit 73 connecting the optical fiber receiver 72 and the first switch circuit 201 (eg, the high-voltage relay SW1 ).

[0086] Exemplarily, the third protection circuit 73 includes: a switching power transistor Q2, a triode Q3, a diode D6, a diode D7, a resistor R33, a resistor R34, a resistor R38, a capacitor C31 and a capacitor C32, and the circuit connection relationship thereof can be referred to Figure 7As shown. The switch control instruction received by the optical fiber receiver 72 can be transmitted to the first switch circuit 201 (e.g., high-voltage relay SW1) in sequence via the transistor Q3, the resistor R33, the resistor R34, the resistor R38, the switch power transistor Q2, and the diode D6 to control the first switch circuit 201 (e.g., high-voltage relay SW1) to open or close. The capacitors C31 and C32 can filter the switch control instruction. The diode D7 can provide overvoltage protection.

[0087] In the embodiment of the present application, a switch control circuit 70 is provided including an optical fiber transmitter 71 and an optical fiber receiver 72, which can extend the signal transmission distance, increase the signal transmission speed, reduce the cost, enhance the data security and simplify the maintenance process based on the optical fiber transceiver technology, so as to realize long-distance and high-speed data transmission, and electrically isolate the high voltage and low voltage of tens of thousands of volts, so as to use the low voltage end to control the high voltage end, thereby ensuring the operational safety and electrical anti-interference of the power system.

[0088] Some embodiments of the present application also provide a power system, including the multi-voltage tracking device described in any of the above embodiments. The power system also has the technical advantages of the multi-voltage tracking device, which will not be described in detail here.

[0089] Exemplarily, the power system also includes high-voltage circuits and / or high-precision circuits, and the voltages of the high-voltage circuits and / or high-precision circuits can be accurately tracked by a multi-voltage tracking device to improve the accuracy, stability and rapid response capability of voltage tracking in the power system.

[0090] In the description of this specification, the description with reference to the terms "some embodiments", "some examples", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0091] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A multi-voltage tracking device, characterized in that: include: A controller connected to the first power supply and at least one second power supply, and configured to: control the first power supply to output a first voltage signal, and control the second power supply to output a second voltage signal; A multi-voltage tracking circuit, comprising: a voltage following circuit connected to the first power supply, an amplifier circuit connected to the voltage following circuit, and a drive circuit connected to the amplifier circuit and the second power supply; An output circuit, connected to the driving circuit, configured to: receive and transmit an output voltage signal; Wherein, the voltage follower circuit is configured to: follow the first voltage signal to form a first follow-up voltage signal; The amplifying circuit is configured to: scale the first following voltage signal to form a first scaled voltage signal; and scale the second following voltage signal to form a second scaled voltage signal; The driving circuit is configured to: follow the output voltage signal to form the second follow voltage signal, and transmit the second follow voltage signal to the amplifying circuit; and perform differential processing on the first scaled voltage signal and the second scaled voltage signal to form a driving signal, so as to form the output voltage signal in response to the driving signal and the second voltage signal; the output voltage signal is equal to the first voltage signal.

2. The multi-voltage tracking device according to claim 1, characterized in that: Also includes: A feedback circuit is connected to the output circuit and the controller, and is configured to: collect the output voltage signal, form a feedback voltage signal, and transmit the feedback voltage signal to the controller; Wherein, the controller is further configured to: identify a fault in response to the feedback voltage signal; and generate a shutdown control instruction in response to the fault.

3. The multi-voltage tracking device according to claim 1 or 2, characterized in that: The voltage follower circuit is connected to the first power supply via a first switch circuit, and is further configured to: when the first switch circuit is turned on, follow the first voltage signal to form a first follower voltage signal; The drive circuit connects the second power supply and the output circuit through a second switching circuit, and is also configured to: transmit the drive signal to the second switching circuit to control the conduction degree of the second switching circuit according to the drive signal, and enable the second switching circuit to provide the output voltage signal to the output circuit in response to the drive signal and the second voltage signal.

4. The multi-voltage tracking device according to claim 3, characterized in that: The voltage follower circuit comprises: A first operational amplifier comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin and an eighth pin; Wherein, the first pin of the first operational amplifier is connected to the second pin of the first operational amplifier; The third pin of the first operational amplifier is connected to the first switch circuit, and the first switch circuit is also connected to the first power supply through a first resistor; The fourth pin of the first operational amplifier is connected to the negative voltage end of the floating power supply; The fifth pin of the first operational amplifier is connected to a reference ground terminal of a floating power supply; The sixth pin of the first operational amplifier is connected to the seventh pin of the first operational amplifier; The eighth pin of the first operational amplifier is connected to the positive voltage end of the floating power supply.

5. The multi-voltage tracking device according to claim 3, characterized in that: The amplifying circuit comprises: A second operational amplifier comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin and an eighth pin; The first pin of the second operational amplifier and the second pin of the second operational amplifier are connected in series via a first capacitor-resistor parallel circuit; the second pin of the second operational amplifier is also connected to a floating power supply reference ground terminal via a second capacitor-resistor parallel circuit; The third pin of the second operational amplifier is connected to the voltage follower circuit via a second resistor; The fourth pin of the second operational amplifier is connected to the negative voltage end of the floating power supply; The fifth pin of the second operational amplifier is connected to the driving circuit via a third resistor; The sixth pin of the second operational amplifier and the seventh pin of the second operational amplifier are connected in series via a third capacitor-resistor parallel circuit; the sixth pin of the second operational amplifier is also connected to the floating power supply reference ground terminal via a fourth capacitor-resistor parallel circuit; the seventh pin of the second operational amplifier is also connected to the driving circuit via a fourth resistor; The eighth pin of the second operational amplifier is connected to the positive voltage end of the floating power supply.

6. The multi-voltage tracking device according to claim 3, characterized in that: The driving circuit comprises: A third operational amplifier comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin and an eighth pin; The first pin of the third operational amplifier and the second pin of the third operational amplifier are connected in series via a fifth capacitor-resistor parallel circuit; the first pin of the third operational amplifier is also connected to the second switch circuit; the second pin of the third operational amplifier is also connected to the amplification circuit via a fourth resistor; The third pin of the third operational amplifier is connected to the amplifying circuit via a fifth resistor; the third pin of the third operational amplifier is also connected to the reference ground terminal of the floating power supply via a sixth capacitor-resistor parallel circuit; The fourth pin of the third operational amplifier is connected to the negative voltage end of the floating power supply; The fifth pin of the third operational amplifier is connected to the second switch circuit via a sixth resistor; The sixth pin of the third operational amplifier is connected to the seventh pin of the third operational amplifier; the seventh pin of the third operational amplifier is connected to the amplifying circuit via a third resistor; The eighth pin of the third operational amplifier is connected to the positive voltage end of the floating power supply.

7. The multi-voltage tracking device according to claim 3, characterized in that: The second switch circuit comprises: A switching power transistor, comprising a control end and a first end and a second end; the control end is connected to the driving circuit via a seventh resistor; The first protection circuit comprises: an overvoltage protection circuit, connected to the control terminal and the first terminal of the switching power transistor; The voltage-dividing and current-limiting circuit comprises: an eighth resistor connected to the control end and the second end of the switching power transistor, and a ninth resistor connected to the second end and the second power supply.

8. The multi-voltage tracking device according to claim 7, characterized in that: The second switch circuit further includes: The second protection circuit is connected to the switching power transistor, the second power supply, the output circuit and the driving circuit, and is configured to perform at least one of overvoltage protection, voltage division and current limiting, voltage stabilization protection and filtering protection on the output voltage signal.

9. The multi-voltage tracking device according to claim 3, characterized in that: The first power supply and the second power supply are both high voltage power supplies; The multi-voltage tracking device further comprises: A first isolation chip, connected between the controller and the communication interface of the first power supply; The second isolation chip is connected between the controller and the communication interface of the second power supply.

10. The multi-voltage tracking device according to claim 3, characterized in that: The first switch circuit is also connected to the second power supply; the multi-voltage tracking device also includes: The switch control circuit is connected to the first switch circuit and the controller, and is configured to: in response to a switch control instruction of the controller, selectively turn on the first power supply and / or the second power supply.

11. The multi-voltage tracking device according to claim 10, characterized in that: The switch control circuit comprises: an optical fiber transmitter, connected to the controller, and configured to: generate an optical fiber transmission signal in response to a control instruction of the controller; The optical fiber receiver is connected to the first switch circuit and is configured to: receive the optical fiber transmission signal and generate the switch control instruction according to the optical fiber transmission signal.

12. A power system, characterized in that: It comprises a multi-voltage tracking device as claimed in any one of claims 1 to 11.

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