CN109980917B - A power supply device suitable for constant voltage repeater or brancher of submarine observation network - Google Patents

Abstract

The invention discloses a power supply device suitable for constant voltage repeaters or branchers of a submarine observation network. The device includes an input filter circuit, a startup power supply circuit, a CV-CV series switch main circuit and a load filter circuit; At both ends of the input filter circuit, the startup power supply circuit and the CV-CV series switch main circuit are connected in parallel at the output end of the input filter circuit; the input end of the CV-CV series switch main circuit is connected to both ends of the input filter circuit , the output terminal is connected to the load filter circuit; the high voltage is filtered by the input filter circuit and then sent to the startup power supply circuit, and the startup power supply circuit generates a startup voltage to trigger the main circuit of the CV-CV series switch, which converts the high voltage into the main circuit of the CV-CV series switch. It is low voltage and is delivered to the load through the load filter circuit. The device of the invention supports a wide voltage input range, the conversion efficiency is as high as 90%, and the power loss is effectively reduced; and the device has a simple structure, high redundancy, small size, and high reliability.

Description

A power supply device suitable for constant voltage repeater or brancher of submarine observation network

technical field

The invention relates to the field of electronic technology, in particular to a power supply device for a constant voltage relay amplifier suitable for a seabed observation network.

Background technique

The submarine observation network consists of shore base stations, submarine optical cables, underwater main base stations, and submarine sensing and observation equipment. The low-voltage electricity supplies power to the submarine sensing equipment, and the observation equipment aggregates and converts the data into optical signals through the main base station and then transmits it to the shore base station through the optical cable to realize real-time, continuous, all-weather, in-situ, and long-term sequence submarine observation.

As the length of the submarine cable increases, the optical signal transmission attenuation increases, so an active repeater amplifier must be used to repeat and amplify the optical signal. The relay amplifier is composed of a laser pump and a power supply circuit. The power required for the laser pump of the relay amplifier is usually in the range of tens of watts, but the reliability needs to be extremely high. The remote power supply system is divided into two types: constant voltage and constant current according to the mode of power supply and distribution. The constant current power supply is mainly used in the international transoceanic submarine communication network, that is, the power supply circuit of its active relay amplifier is a constant current conversion circuit. As for the submarine observation network, due to the high power required by the submarine sensor observation equipment and the high scalability requirements, many constant voltage power supply systems are used, such as the RSN in the United States and the NEPTUNE submarine observation network in Canada. In the constant voltage power supply system, the constant voltage energy conversion circuit suitable for the repeater amplifier is limited to the requirements of size, reliability and foreign technical blockade, and there is no public information for reference. Traditional constant voltage conversion circuits, such as linear power supply schemes such as input voltage regulators and resistors in series (as shown in Figure 1 and Figure 2), realize voltage division and conversion in the way of multi-module series-parallel connection. Although the redundancy is high, the conversion The efficiency is low, the equipment is complex, and the volume is large and difficult to apply.

In view of the low-power, high-voltage-to-low-voltage circuits required by constant-voltage repeaters in the submarine observation network, the existing high-voltage-to-low-voltage converters have many problems to be solved, such as low efficiency, poor reliability, and large size. Reliable, high-efficiency, small-volume high-voltage to low-voltage conversion device.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned defects of the power supply device of the constant voltage repeater in the current seabed observation network, and to provide a power supply device of the constant voltage repeater or the brancher of the seabed observation network, which has small size, The advantage of high reliability.

In order to achieve the above purpose, the present invention provides a power supply device for a constant voltage repeater or brancher of a submarine observation network, the power supply device includes an input filter circuit, a startup power supply circuit, and a CV-CV series switch main circuit

The DC high voltage is connected to both ends of the input filter circuit, the startup power supply circuit and the CV-CV series switch main circuit are connected in parallel to the output end of the input filter circuit; the input end of the CV-CV series switch main circuit is connected to the input filter circuit Both ends of the circuit, the output end is connected to the load filter circuit;

The high voltage is filtered by the input filter circuit and then sent to the startup power supply circuit. The startup power supply circuit generates a startup voltage to trigger the CV-CV series switch main circuit. to the load.

As an improvement of the above device, the device further includes: an input overvoltage and undervoltage protection circuit for realizing input voltage protection of the converter; the input overvoltage and undervoltage protection circuit is connected in parallel with the startup power circuit and the CV- CV series switches between the main circuits; the input overvoltage and undervoltage protection circuit includes: a sampling resistor, a reference reference power supply and a controller.

As an improvement of the above device, the input filter circuit is an LC filter circuit.

As an improvement of the above device, the startup power supply circuit includes a startup resistor R1, an input capacitor C2, a Zener diode D1 and a DC-DC converter; the startup resistor R1 is connected in series with the input capacitor C2, and the input capacitor C2 is connected to The Zener diode D1 is connected in parallel with the DC-DC converter, and the startup power supply is used to supply power to the entire converter during the startup phase.

As an improvement of the above device, the load filter circuit is equivalent to a capacitive device.

As an improvement of the above device, the CV-CV series switch main circuit includes: a series switch circuit, a voltage equalization module, a series switch drive circuit, a control circuit, a freewheeling switch circuit, an output filter circuit and a sampling circuit; the series connection The switch circuit is connected to the input terminal;

The series switch circuit is composed of several low-voltage switches in series; the freewheeling switch circuit and the output filter circuit form a parallel circuit; the series switch circuit is connected in series with the parallel circuit, wherein the voltage equalization module is connected to each of the series switch circuits The switches are connected in parallel to realize voltage equalization protection; the series switch drive circuit is used to equalize the voltage, the load side uses a voltage equalization circuit for voltage equalization, and the gate side uses a high-efficiency synchronous drive circuit; the control circuit The switch circuit is controlled by changing the on-off time and frequency of the switch to realize the conversion from high voltage to low voltage; the voltage stability is realized through closed-loop control; the freewheeling switch circuit is composed of several low-voltage switches in series, when the series switch circuit When turned off, the inductor supplies power to the filter capacitor and the load through the freewheeling switch circuit; the series switch driving circuit, the control circuit and the sampling circuit are connected in series in sequence, and are used for voltage regulation control of the CV-CV series switch main circuit.

As an improvement of the above device, the CV-CV series switch main circuit includes: a series switch circuit, a voltage equalization module, a series switch drive circuit, a control circuit, a freewheeling switch circuit, an output filter circuit and a sampling circuit; the continued The flow switch circuit is connected to the input end; the series switch circuit is directly grounded;

The series switch circuit is composed of several low-voltage switches in series; the series switch circuit, the freewheeling switch circuit and the output filter circuit are connected in parallel; wherein the voltage equalization module is connected in parallel with each switch of the series switch circuit; the series The switch drive circuit is used to equalize the voltage, the load side uses a voltage equalization circuit for voltage equalization, and its gate side uses a high-efficiency synchronous drive circuit; the control circuit controls the series switch circuit and changes the on-off time and frequency of the switch. Realize the conversion from high voltage to low voltage; realize voltage stability through closed-loop control; the freewheeling switch circuit is composed of several low-voltage switches in series. When the series switch circuit is turned off, the inductor passes the freewheeling switch circuit to filter capacitors and The load power supply; the series switch drive circuit, the control circuit and the sampling circuit are connected in series in sequence, and are used for voltage stabilization control of the CV-CV series switch main circuit.

As an improvement of the above device, the low voltage switch of the series switch circuit is IGBT, MOSFET or thyristor; the low voltage switch of the freewheeling switch circuit is IGBT, MOSFET, thyristor or diode.

As an improvement of the above device, the sampling circuit includes: a resistor R3, a resistor R5, a discharge tube DS2 and a resistor R4; the resistor R3 and the resistor R5 are connected in series to the output voltage, the other end of the resistor R5 is grounded, and the discharge The tube DS2 is connected in parallel with the resistor R5; one end of the resistor R4 is connected to the discharge tube DS2, the other end is connected to the capacitor and sent to the operational amplifier, and two diodes are also connected, of which one diode is connected to the cathode and the anode is connected to the negative power supply; the other diode is connected to the negative power supply. The anode is connected, and the cathode is connected to the positive power supply.

The main innovation of the present invention:

1. The high voltage to low voltage converter of the present invention uses a series switching scheme. In the design, a single module that can withstand high voltage is mainly used. The module is composed of a series of low-voltage electronic switching components in series, so as to effectively solve the problems of high cost, complex design and large volume of multi-module series-parallel voltage division;

2. The protection of the converter is realized by the input overvoltage and undervoltage protection circuit; the voltage equalization protection of the series switching devices is realized by using the voltage equalizing module; the reliability of the system is ensured by the use of high reliability devices.

3. The device of the present invention can realize the conversion from 6-15kVDC high voltage to 12-48VDC low voltage, and the conversion efficiency can reach 90%. It is especially suitable for the application scenarios where the repeaters and branchers of the constant voltage power supply submarine observation network require tens of watts of power.

The beneficial effects of the present invention are:

1. The device of the present invention supports a wide voltage input range, and the maximum input voltage can reach 15kV and above; the conversion efficiency is as high as 90%, which effectively reduces power loss;

2. The overall structure of the device of the present invention is simple, the redundancy is high and the volume is small;

3. The device of the present invention reduces the voltage borne by a single power device by dividing the voltage in series, and improves the reliability and service life of the system;

4. The device of the present invention adopts a multi-module series-parallel combination mode, so that the damage of a single module will not cause the entire converter to collapse, thereby improving the reliability of the system.

Description of drawings

Fig. 1 is the constant current system series voltage regulator tube circuit of the prior art;

Fig. 2 is the linear high-voltage to low-voltage circuit of the prior art resistance series voltage-stabilizing pipeline;

Fig. 3 is the triode type linear regulator circuit of the prior art;

Fig. 4 is the general circuit diagram of the present invention;

5 is a schematic circuit diagram of a startup power supply of the present invention;

Fig. 6 is the schematic diagram of the sampling circuit of the CV-CV series switch main circuit of the present invention;

7 is a schematic diagram of the connection mode 1 of the main circuit of the CV-CV series switch of the present invention;

8 is a schematic diagram of the connection mode 2 of the main circuit of the CV-CV series switch of the present invention;

In Figure 1, I+ is the current inflow terminal, and I- is the current outflow terminal.

In Figure 4, HVin and GND are input high voltage terminals, and Uout and GND are output low voltage terminals.

In Figure 5, hv and GND are the input high-voltage terminals, and U+ and U- are the output low-voltage terminals of the startup circuit.

In Fig. 6, Uout is the output voltage of the converter, and Ubk is the voltage after the output voltage is set.

In Figure 7, the nodes 1 and 2 are the incoming line ends, and the nodes 3 and 4 are the outgoing lines.

In Figure 8, nodes 1 and 2 are the incoming line ends, and nodes 3 and 4 are the outgoing lines.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples.

As shown in Figure 4, a power supply device for a constant voltage repeater or brancher of a submarine observation network includes an input filter circuit, a startup power supply, an input overvoltage and undervoltage protection circuit, a CV-CV series switch main circuit and a load filter circuit. The input end of the input filter circuit is subjected to high voltage DC, the start-up power supply and the input overvoltage and undervoltage protection circuit are connected in parallel to the output end of the input filter circuit, and the input end of the main circuit of the CV-CV series switch is connected in parallel to the output end of the input filter circuit. The output end of the main circuit of the series switch is connected in parallel with both ends of the load filter circuit, and the rear end of the load filter circuit is connected with the load.

working principle

The high voltage is filtered by the input filter circuit and then sent to the starting power supply to charge the low-voltage starting power supply, and a starting voltage is generated by the starting power supply to trigger the main circuit of the CV-CV series switch. The over-voltage and under-voltage protection circuit samples and compares the input voltage to protect the converter, and sends it to the load through the load filter circuit.

1. Input filter circuit

The input filter circuit may be a typical LC filter circuit.

2. Turn on the power

As shown in Figure 5, the startup power supply supplies power to the entire high-voltage-to-low-voltage converter or equipment during the power-on startup phase. The startup power supply includes startup resistor R1, input capacitor C2, Zener diode D1 and DC-DC converter. Terminal A is connected to the high voltage input, resistor R1 is connected in series with C2, and C2 is connected in parallel with the Zener tube and the DC-DC converter. The outputs are labeled U+ and U-.

The high voltage is connected to the high voltage resistor, and the capacitor is charged through the high voltage resistor, and stops charging when the voltage of the voltage regulator tube is reached. When the DC-DC power supply starts to work, the voltage of the voltage regulator is converted to the voltage required by the main circuit control circuit of the CV-CV series switch. The energy of the DC-DC conversion voltage is determined by the charging capacitor, that is, the capacity of the capacitor and the charging voltage determine the time for supplying power to the main circuit control circuit of the CV-CV series switch.

As shown in Figure 5, the startup power supply uses the circuit scheme of the linear power supply, and the use time is short, which will not affect the efficiency of the power supply during stable operation.

3. Input undervoltage protection circuit

The input overvoltage and undervoltage protection circuit includes: a sampling resistor, a reference reference power supply and a controller to realize the input voltage protection of the converter.

4. CV-CV series switch main circuit

The main circuit of the CV-CV series switch includes: a series switch circuit, a voltage equalization module, a series switch drive circuit, a control circuit, a freewheeling switch circuit, a filter circuit and a sampling circuit.

The main circuit of CV-CV series switch realizes the transformation of input and output through pulse width modulation (PWM) and pulse frequency modulation (PFM). Pulse width modulation converts high voltage into low voltage by controlling the duty cycle; pulse frequency modulation converts high voltage into low voltage by changing the output frequency.

When the series switch circuit is turned on, the high voltage charges the filter circuit at the rear stage through the series switch circuit. Inside the filter circuit, the high voltage charges the filter capacitor through the current limiting inductor. When the output voltage amplitude is reached, the energy is stored in the filter circuit. In the inductive device and the capacitive device in the circuit; when the series switch circuit is turned off, the inductance supplies power to the filter capacitor and the load through the freewheeling switch circuit.

(1) Series switch circuit

The series switch circuit is the core component of the present invention. The series switch circuit is composed of a series of low-voltage electronic switches in series, and after being connected in series, they jointly bear the high voltage of the system switching process. When the series switch circuit is turned on, the input voltage amplitude reaches more than 15kV, and each series switch device will bear the unequal voltage U _x , the total input voltage U _total =U ₁ +U ₂ +U ₃ +… . Through this voltage division mode, the withstand voltage of a single electronic switch is reduced. If the electronic switch breaks down, the voltage U _x it withstands will be dispersed to other electronic switches to ensure the normal operation of the system, thereby improving system reliability and reducing system reliability. risk.

At the same time, the circuit is in the underwater sealed cavity, and the heat dissipation of the components needs to be fully considered. This switching device mainly uses IGBT, MOSFET, thyristor, etc. The components using these materials have high operating frequency, low on-resistance and small chip size. , The characteristics of high temperature and high pressure resistance are conducive to the miniaturization of modules, the miniaturization of peripheral components, and the simplification of cooling mechanisms. In the implementation process, issues such as cost and application technology are considered, and are not limited to these types.

(2) Voltage equalization module

When the series switch circuit is turned off and turned on, each switch device will bear an unequal voltage, that is, the voltage distribution will be unbalanced, thereby causing damage to the switch device. Therefore, a voltage equalization module is added to the series switch circuit for voltage equalization protection to ensure the reliable operation of the switch.

(3) Series switch drive circuit

Since the switching speed of the device is very fast, it is basically completed within a few microseconds, which is easy to cause voltage imbalance between the switching devices, including static voltage imbalance, on-state voltage imbalance, off-state voltage imbalance, turn-on voltage imbalance, Turn off voltage unbalance. In order to solve the problem of voltage balance in this system, the load side uses a voltage equalization circuit for voltage equalization, and the gate side uses a high-efficiency synchronous drive circuit.

(4) Control circuit

The control circuit realizes the conversion from high voltage to low voltage by controlling the series switch circuit and changing the on-off time and frequency of the switch. The stability of the system voltage is achieved through the closed-loop control of the control circuit.

(5) Freewheeling switch circuit

The freewheeling switch circuit consists of a series of low-voltage switches in series. When the series switch circuit is turned off, the inductor supplies power to the filter capacitor and the load through the freewheeling switch circuit. After being connected in series, they can jointly bear the high voltage of the system switching process. Switching devices mainly use IGBT, MOSFET, thyristor, diode, etc., but are not limited to these types.

(6) Output filter circuit

The output filter circuit may be a typical LC filter circuit.

(7) Sampling circuit

The sampling circuit is shown in Figure 6. The sampling circuit uses the withstand voltage resistance to sample, and realizes the closed-loop control of the main circuit of the series switch. Among them, the sampling resistor R3 and R5 are connected in series and connected between the output end and the ground; the discharge tube DS1 and R5 are connected in parallel; one end of R4 is connected to the discharge tube DS1, and the other end is connected to the operational amplifier through a capacitor; at the same time, two diodes are also connected, among which One diode is connected to the cathode, and the anode is connected to the negative power supply; the other diode is connected to the anode, and the cathode is connected to the positive power supply.

(8) The connection method of the main circuit of the series switch

①CV-CV series switch main circuit connection mode 1:

As shown in FIG. 7 , node 1 is the input terminal, the series switch circuit is connected to node 1, the freewheeling switch circuit and the filter circuit are connected in parallel and then connected in series with the series switch circuit. The voltage equalization module is respectively connected in parallel with each switch in the series switch circuit. The output of the filter circuit is denoted as node 3 and node 4, and node 2 is grounded.

②CV-CV series switch main circuit connection mode 2:

As shown in Fig. 8, node 1 is the input terminal, the freewheeling switch circuit is connected in parallel with the filter circuit, and then connected in series with the series switch circuit. The voltage equalization module is connected in parallel with each switch of the series switch circuit respectively. The output of the filter circuit is denoted as node 3 and node 4, node 2 is grounded, and the series switch circuit is connected with node 2.

These two switching methods can be used, with the same benefits. Through the series connection of multiple switch components, the voltage of a single component is reduced, and the damage of a single switch component will not affect the normal operation of the entire system, which improves the system reliability and reduces the maintenance cost of marine equipment. In practical applications, considering the input voltage, design mode, etc., the number of switching devices can be selected as needed. For example, if a voltage of 15kV is input, a single switching device can withstand a voltage of about 4000V, and at least 4 switching devices can be selected to meet the requirements.

5. Load filter circuit

The load filter circuit is equivalent to a capacitive device.

The invention can be used as a power conversion module in the repeaters and branchers of the submarine observation network, and is suitable for a constant voltage optical fiber communication system with high-voltage power supply at both ends, and also for high-voltage to low-voltage conversion in other low-power occasions.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that any modification or equivalent replacement of the technical solutions of the present invention will not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the present invention. within the scope of the claims.

Claims (14)

1. A power supply device suitable for a constant-voltage repeater or amplifier of a submarine observation network is characterized by comprising an input filter circuit, a starting power circuit, a CV-CV series switch main circuit and a load filter circuit;

the direct-current high voltage is connected to two ends of the input filter circuit, and the starting power circuit and the CV-CV series switch main circuit are connected to the output end of the input filter circuit in parallel; the input end of the CV-CV series switch main circuit is connected with two ends of the input filter circuit, and the output end of the CV-CV series switch main circuit is connected with the load filter circuit;

the high voltage is filtered by the input filter circuit and then is sent to the starting power circuit, the starting power circuit generates a starting voltage to trigger the CV-CV series switch main circuit, and the CV-CV series switch main circuit converts the high voltage into the low voltage and transmits the low voltage to a load through the load filter circuit;

the CV-CV series switch main circuit comprises: the circuit comprises a series switch circuit, a voltage-sharing module, a series switch driving circuit, a control circuit, a follow current switch circuit, an output filter circuit and a sampling circuit; the series switch circuit is connected with the input end;

the series switch circuit is formed by connecting a plurality of low-voltage switches in series; the follow current switch circuit and the output filter circuit form a parallel circuit; the series switch circuit is connected with the parallel circuit in series, and the voltage-sharing module is connected with each switch of the series switch circuit in parallel respectively and is used for realizing voltage-sharing protection; the series switch driving circuit is used for balancing voltage, a voltage balancing circuit is used on a load side of the series switch driving circuit for voltage balancing, and a high-efficiency synchronous driving circuit is used on a gate side of the series switch driving circuit; the control circuit controls the series switch circuit to change the on-off time and frequency of the switch to realize the conversion from high voltage to low voltage; voltage stabilization is realized through closed-loop control; the follow current switch circuit is formed by connecting a plurality of low-voltage switches in series, and when the series switch circuit is switched off, the inductor supplies power to the filter capacitor and the load through the follow current switch circuit; the series switch driving circuit, the control circuit and the sampling circuit are sequentially connected in series and used for performing voltage stabilization control on the CV-CV series switch main circuit.

2. The power supply device for the subsea observation network constant voltage repeater or amplifier as claimed in claim 1, further comprising: the input overvoltage and undervoltage protection circuit is used for realizing input voltage protection of the converter; the input overvoltage and undervoltage protection circuit is connected in parallel between the starting power circuit and the CV-CV series switch main circuit; the input overvoltage and undervoltage protection circuit comprises: the device comprises a sampling resistor, a reference power supply and a controller.

3. The power supply device for the constant voltage repeater or amplifier of the subsea observation network as claimed in claim 1, wherein said input filter circuit is an LC filter circuit.

4. The power supply device suitable for the subsea observation network constant voltage repeater or amplifier as claimed in claim 1, wherein the starting power circuit comprises a starting resistor R1, an input capacitor C2, a zener diode D1 and a DC-DC converter; the starting resistor R1 is connected in series with an input capacitor C2, the input capacitor C2 is connected in parallel with a zener diode D1 and a DC-DC converter, and the starting power supply supplies power to the entire converter during the start-up phase.

5. The power supply device for the constant voltage repeater or amplifier of the subsea observation network as claimed in claim 1, wherein the load filter circuit is equivalent to a capacitive device.

6. The power supply device suitable for the subsea observation network constant voltage repeater or amplifier as claimed in claim 1, wherein the low voltage switch of the series switching circuit is an IGBT, a MOSFET or a thyristor; the low-voltage switch of the follow current switch circuit is an IGBT, an MOSFET, a silicon controlled rectifier or a diode.

7. The power supply device of claim 1, wherein the sampling circuit comprises: a resistor R3, a resistor R5, a discharge tube DS2 and a resistor R4; the resistor R3 and the resistor R5 are connected in series and connected on an output voltage, the other end of the resistor R5 is grounded, and the discharge tube DS2 is connected with the resistor R5 in parallel; one end of the resistor R4 is connected with the discharge tube DS2, the other end is connected with a capacitor and is fed into an operational amplifier, and the resistor R4 is also connected with two diodes, wherein the cathode of one diode is connected with a negative power supply, and the anode of the diode is connected with a negative power supply; the anode of the other diode is connected with the positive power supply, and the cathode of the other diode is connected with the positive power supply.

8. A power supply device suitable for a constant-voltage repeater or amplifier of a submarine observation network is characterized by comprising an input filter circuit, a starting power circuit, a CV-CV series switch main circuit and a load filter circuit;

the direct-current high voltage is connected to two ends of the input filter circuit, and the starting power circuit and the CV-CV series switch main circuit are connected to the output end of the input filter circuit in parallel; the input end of the CV-CV series switch main circuit is connected with two ends of the input filter circuit, and the output end of the CV-CV series switch main circuit is connected with the load filter circuit;

the high voltage is filtered by the input filter circuit and then is sent to the starting power circuit, the starting power circuit generates a starting voltage to trigger the CV-CV series switch main circuit, and the CV-CV series switch main circuit converts the high voltage into the low voltage and transmits the low voltage to a load through the load filter circuit; the CV-CV series switch main circuit comprises: the circuit comprises a series switch circuit, a voltage-sharing module, a series switch driving circuit, a control circuit, a follow current switch circuit, an output filter circuit and a sampling circuit; the follow current switch circuit is connected with the input end; the series switching circuit is directly grounded;

the series switch circuit is formed by connecting a plurality of low-voltage switches in series; the series switch circuit and the follow current switch circuit are connected in parallel with the output filter circuit; the voltage-sharing module is respectively connected with each switch of the series switch circuit in parallel; the series switch driving circuit is used for balancing voltage, a voltage balancing circuit is used on a load side of the series switch driving circuit for voltage balancing, and a high-efficiency synchronous driving circuit is used on a gate side of the series switch driving circuit; the control circuit controls the series switch circuit to change the on-off time and frequency of the switch to realize the conversion from high voltage to low voltage; voltage stabilization is realized through closed-loop control; the follow current switch circuit is formed by connecting a plurality of low-voltage switches in series, and when the series switch circuit is switched off, the inductor supplies power to the filter capacitor and the load through the follow current switch circuit; the series switch driving circuit, the control circuit and the sampling circuit are sequentially connected in series and used for performing voltage stabilization control on the CV-CV series switch main circuit.

9. The power supply apparatus for a subsea observation network constant voltage repeater or amplifier as claimed in claim 8, further comprising: the input overvoltage and undervoltage protection circuit is used for realizing input voltage protection of the converter; the input overvoltage and undervoltage protection circuit is connected in parallel between the starting power circuit and the CV-CV series switch main circuit; the input overvoltage and undervoltage protection circuit comprises: the device comprises a sampling resistor, a reference power supply and a controller.

10. The power supply device for the constant voltage repeater or amplifier of the subsea observation network as claimed in claim 8, wherein the input filter circuit is an LC filter circuit.

11. The power supply device suitable for the subsea observation network constant voltage repeater or amplifier as claimed in claim 8, wherein the starting power circuit comprises a starting resistor R1, an input capacitor C2, a zener diode D1 and a DC-DC converter; the starting resistor R1 is connected in series with an input capacitor C2, the input capacitor C2 is connected in parallel with a zener diode D1 and a DC-DC converter, and the starting power supply supplies power to the entire converter during the start-up phase.

12. The power supply device for the constant voltage repeater or amplifier of the subsea observation network as claimed in claim 8, wherein the load filter circuit is equivalent to a capacitive device.

13. The power supply device for the subsea observation network constant voltage repeater or amplifier as claimed in claim 8, wherein the low voltage switch of the series switching circuit is an IGBT, a MOSFET or a thyristor; the low-voltage switch of the follow current switch circuit is an IGBT, an MOSFET, a silicon controlled rectifier or a diode.

14. The power supply device of claim 8, wherein the sampling circuit comprises: a resistor R3, a resistor R5, a discharge tube DS2 and a resistor R4; the resistor R3 and the resistor R5 are connected in series and connected on an output voltage, the other end of the resistor R5 is grounded, and the discharge tube DS2 is connected with the resistor R5 in parallel; one end of the resistor R4 is connected with the discharge tube DS2, the other end is connected with a capacitor and is fed into an operational amplifier, and the resistor R4 is also connected with two diodes, wherein the cathode of one diode is connected with a negative power supply, and the anode of the diode is connected with a negative power supply; the anode of the other diode is connected with the positive power supply, and the cathode of the other diode is connected with the positive power supply.

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