CN214069574U - Overvoltage protection system for high-voltage direct-current constant-current input - Google Patents
Overvoltage protection system for high-voltage direct-current constant-current input Download PDFInfo
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- CN214069574U CN214069574U CN202023042632.4U CN202023042632U CN214069574U CN 214069574 U CN214069574 U CN 214069574U CN 202023042632 U CN202023042632 U CN 202023042632U CN 214069574 U CN214069574 U CN 214069574U
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Abstract
The utility model discloses an overvoltage protection system for high-voltage direct-current constant-current input, which comprises an auxiliary power circuit, a reference voltage circuit, a voltage detection circuit, an overvoltage detection circuit, a drive circuit and an energy absorption circuit, wherein the auxiliary power circuit is connected with a positive bus, a negative bus, the reference voltage circuit, the overvoltage detection circuit and the drive circuit and provides low-voltage auxiliary electricity; the reference voltage circuit is connected with the overvoltage detection circuit and sends the generated reference voltage to the overvoltage detection circuit; the voltage detection circuit is connected with the positive and negative buses, generates a low-voltage signal, and is connected with the overvoltage detection circuit and sends the low-voltage signal to the overvoltage detection circuit; the overvoltage detection circuit is connected with the energy absorption circuit through the driving circuit, the energy absorption circuit is connected with the positive and negative buses, the overvoltage detection circuit generates a driving signal and sends the driving signal to the driving circuit, and the energy absorption circuit is driven through the driving circuit. The utility model discloses can prevent that back-stage terminal equipment from receiving big surge voltage's impact.
Description
Technical Field
The utility model relates to a high voltage direct current constant current transmission technical field, in particular to overvoltage protection system of high voltage direct current constant current input.
Background
The application of the current high-voltage direct-current constant-voltage transmission is very wide, and the application of the high-voltage direct-current constant-current transmission is just developed, so that the application of the high-voltage direct-current constant-current transmission is relatively less, and related technical data are less. In the use process of the current high-voltage direct-current constant-current power transmission, due to the fact that a power transmission cable is long, the high-voltage direct-current constant-current power transmission is easily interfered by the outside, voltage on the power transmission cable generates a large voltage peak, and therefore using equipment is damaged.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's shortcoming and not enough, provide an overvoltage protection system of high voltage direct current constant current input, this system can fall the overvoltage peak energy absorption of input, protects rear terminal equipment not receive the impact of big surge voltage, has effectively protected rear terminal equipment.
The purpose of the utility model is realized through the following technical scheme: an overvoltage protection system for high-voltage direct-current constant-current input comprises an auxiliary power supply circuit, a reference voltage circuit, a voltage detection circuit, an overvoltage detection circuit, a drive circuit and an energy absorption circuit, wherein,
the auxiliary power circuit is connected with the positive and negative buses for transmitting high voltage, is connected with the reference voltage circuit, the overvoltage detection circuit and the drive circuit, and respectively provides low-voltage auxiliary power converted from the input high voltage to the reference voltage circuit, the overvoltage detection circuit and the drive circuit;
the reference voltage circuit generates reference voltage, is connected with the overvoltage detection circuit and sends the reference voltage to the overvoltage detection circuit;
the voltage detection circuit is connected with the positive and negative buses, generates a low-voltage signal, and is connected with the overvoltage detection circuit and sends the low-voltage signal to the overvoltage detection circuit;
the overvoltage detection circuit is connected with the energy absorption circuit through the driving circuit, the energy absorption circuit is connected with the positive and negative buses, the overvoltage detection circuit generates a driving signal and sends the driving signal to the driving circuit, and the energy absorption circuit is driven through the driving circuit.
Preferably, the auxiliary power supply circuit comprises a first resistor, a second resistor, a third resistor, a first voltage stabilizing diode, a second voltage stabilizing diode, a first capacitor and a first MOS transistor;
one end of the first resistor is connected with the positive bus, the other end of the first resistor is connected with the grid of the first MOS tube, the grid of the first MOS tube is also connected with the cathode of the first voltage stabilizing diode, and the anode of the first voltage stabilizing diode is connected with the negative bus; one end of the second resistor is connected with the positive bus, and the other end of the second resistor is connected with the drain electrode of the first MOS tube; the cathode of the second voltage stabilizing diode is connected with the source electrode of the first MOS tube, and the anode of the second voltage stabilizing diode is connected with the negative bus; one end of the third resistor is connected with the positive bus, and the other end of the third resistor is connected with the source electrode of the first MOS tube; the source electrode of the first MOS tube is connected with a reference voltage circuit; one end of the first capacitor is connected with the source electrode of the first MOS tube and the reference voltage circuit, and the other end of the first capacitor is connected with the negative bus.
Preferably, the reference voltage circuit comprises a voltage reference chip, a second capacitor, a fourth resistor and a fifth resistor, an input interface of the voltage reference chip is connected with the auxiliary power supply circuit, a ground interface of the voltage reference chip is connected with the negative bus, an output interface of the voltage reference chip is connected to the overvoltage detection circuit through the fourth resistor, the output interface of the voltage reference chip is connected to the overvoltage detection circuit through the second capacitor and the fifth resistor which are connected in sequence, and the second capacitor and the fifth resistor are both connected to the negative bus.
Preferably, the voltage detection circuit comprises a sixth resistor, a seventh resistor and a third capacitor, the positive bus and the negative bus are connected through the sixth resistor and the seventh resistor which are connected in series, the sixth resistor is connected with the positive bus, the seventh resistor is connected with the negative bus, the third capacitor is connected with the seventh resistor in parallel, one end of the third capacitor is connected with the negative bus, and the other end of the third capacitor is connected with the seventh resistor, the sixth resistor and the overvoltage detection circuit.
Preferably, the overvoltage detection circuit comprises a comparator, an eighth resistor, a ninth resistor, a tenth resistor and an eleventh resistor;
the inverting input end of the comparator is connected with the reference voltage circuit through an eighth resistor, the non-inverting input end of the comparator is connected with the voltage detection circuit through a ninth resistor, the output end of the comparator is connected with the driving circuit, is connected with the auxiliary power supply circuit through an eleventh resistor, and is connected with the non-inverting input end of the comparator through a tenth resistor.
Preferably, the driving circuit comprises a driving amplifier, a twelfth resistor and a thirteenth resistor, the input end of the driving amplifier is connected with the overvoltage detection circuit through the twelfth resistor, and the output end of the driving amplifier is connected with the energy absorption circuit through the thirteenth resistor.
Preferably, the energy absorption circuit comprises a fourteenth resistor, a fifteenth resistor and a second MOS transistor, a drain of the second MOS transistor is connected to the positive bus through the fourteenth resistor, a gate of the second MOS transistor is connected to the driving circuit and to the negative bus through the fifteenth resistor, and a source of the second MOS transistor is connected to the negative bus.
The utility model discloses for prior art have following advantage and effect:
(1) the utility model provides an overvoltage protection system of high voltage direct current constant current input can detect the voltage on the input line through this system, when voltage increases the protection value suddenly, can fall the overvoltage peak energy absorption of input, protects rear terminal equipment not receive the impact of big surge voltage to rear terminal equipment has been protected effectively, ensures rear terminal equipment's safe in utilization.
(2) The utility model discloses overvoltage protection system comprises pure hardware circuit, and for the circuit that adopts the singlechip to make the judgement, it is few to have the device, and the advantage that the reliability is high, because the singlechip will write into certain procedure, in the use, it can take place the program card and die to have the probability, is disturbed the singlechip and restarts, is disturbed the singlechip and gets into the possibility of other procedures, so adopt pure hardware circuit just not have the existence of above-mentioned trouble, can improve the reliability of circuit greatly.
(3) The utility model discloses overvoltage protection system comprises pure hardware circuit, and the selection of device is a lot of, can choose for use the device made in China to satisfy the demand of specific occasion 100% localization device, and adopt the singlechip circuit, will reach outstanding performance, still hardly find suitable device made in the whole country at present.
(4) The utility model discloses overvoltage protection system comprises pure hardware circuit, and on the selection of domestic device, there are a lot of-55 ℃ to 125 ℃ of temperature within's device to select, and environmental suitability is good, the expansion use occasion that can be very big to can satisfy the user demand of specific occasion. The single chip circuit is difficult to select devices with the temperature ranging from-55 ℃ to 125 ℃, the cost is very high, and the environmental adaptability is poor.
(5) Other current auxiliary power supply circuit schemes, because power is great, the circuit will add auxiliary power all the way, and it is extremely inconvenient to use, and the utility model discloses an auxiliary power supply is by so coming through non-isolation conversion from the input, and auxiliary power supply circuit need not add auxiliary power all the way, consequently uses more conveniently, and whole overvoltage protection circuit's wiring is also simpler, only needs to connect two lines (input positive pole, input negative pole) can work.
Drawings
Fig. 1 is a schematic block diagram of the overvoltage protection system for high-voltage direct-current constant-current input according to the present invention.
Fig. 2 is a circuit diagram of an embodiment overvoltage protection system.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
Examples
The embodiment discloses an overvoltage protection system for high-voltage direct-current constant-current input, which comprises an auxiliary power supply circuit, a reference voltage circuit, a voltage detection circuit, an overvoltage detection circuit, a driving circuit and an energy absorption circuit, as shown in fig. 1.
The auxiliary power circuit is connected with a positive electrode bus and a negative electrode bus for transmitting high voltage, and is used for converting the input high voltage into low-voltage auxiliary power. The auxiliary power supply circuit is connected with the reference voltage circuit, the overvoltage detection circuit and the drive circuit, and supplies low-voltage auxiliary power to the reference voltage circuit, the overvoltage detection circuit and the drive circuit for use.
The reference voltage circuit is used for generating reference voltage, is connected with the overvoltage detection circuit and sends the reference voltage to the overvoltage detection circuit so as to compare and judge overvoltage signals.
The voltage detection circuit is connected with the positive and negative buses for transmitting high voltage and used for detecting input voltage and converting a high voltage signal into a low voltage signal, and the voltage detection circuit is connected with the overvoltage detection circuit and sends the low voltage signal to the overvoltage detection circuit.
The overvoltage detection circuit is connected with the energy absorption circuit through the driving circuit and is used for receiving the low-voltage signal sent by the voltage detection circuit and the reference voltage sent by the reference voltage circuit, and then comparing and judging the low-voltage signal and the reference voltage, so that a driving signal is sent out to control the driving circuit.
The driving circuit is used for receiving the driving signal, carrying out voltage and power matching amplification on the driving signal and then driving the energy absorption circuit.
The energy absorption circuit is connected with the positive bus and the negative bus and used for receiving a driving signal sent by the driving circuit so as to drive a switching device of the energy absorption circuit to absorb input overvoltage energy and protect the rear-stage terminal equipment from being impacted by a large voltage peak.
Specifically, as shown in fig. 2, the auxiliary power supply circuit includes a first resistor R3, a second resistor R4, a third resistor R5, a first zener diode Z1, a second zener diode Z2, a first capacitor C1, and a first MOS transistor Q1.
One end of the first resistor is connected with an anode bus (VIN +), the other end of the first resistor is connected with a grid electrode of the first MOS tube, the grid electrode of the first MOS tube is also simultaneously connected with a cathode of the first voltage stabilizing diode, and an anode of the first voltage stabilizing diode is connected with a cathode bus (VIN-); one end of the second resistor is connected with the positive bus, and the other end of the second resistor is connected with the drain electrode of the first MOS tube; the cathode of the second voltage stabilizing diode is connected with the source electrode of the first MOS tube, and the anode of the second voltage stabilizing diode is connected with the negative bus; one end of the third resistor is connected with the positive bus, and the other end of the third resistor is connected with the source electrode of the first MOS tube; the source electrode of the first MOS tube is connected with the reference voltage circuit and outputs an auxiliary voltage VCC to the reference voltage circuit; one end of the first capacitor is connected with the source electrode of the first MOS tube and the reference voltage circuit, and the other end of the first capacitor is connected with the negative bus. Here, the first MOS transistor is an N-channel MOS transistor.
In the present embodiment, the first resistor R3 is a large-resistance resistor (i.e. a resistor with a resistance of 1M or more), and cooperates with the first zener diode Z1 to provide a static gate voltage for the first MOS transistor Q1; the third resistor R5 is a large-resistance resistor, and cooperates with the second zener diode Z2 and the first capacitor C1 to provide a static stable supply voltage when the whole protection circuit does not enter an overvoltage protection state. Since R5 is a large resistance resistor, the static power loss is low. The second resistor R4 is a middle-resistance resistor (i.e. a resistor with a resistance value of 1K-1M), and is used together with the Q1 and the C1 to provide dynamic and high-power stable power supply voltage for the overvoltage detection circuit, the reference voltage circuit and the driving circuit when the whole protection circuit enters an overvoltage protection state. When the whole protection circuit is not in an overvoltage protection state, because the voltage of Z2 is higher than that of Z1, R4 and Q1 are not conducted, and power loss is not generated. It can be seen that the auxiliary power supply circuit of the present embodiment fully considers various operating states of the protection circuit and improves efficiency as much as possible.
As shown in fig. 2, the reference voltage circuit includes a voltage reference chip U3, a second capacitor C2, a fourth resistor R6, and a fifth resistor R7, wherein an input interface of the voltage reference chip is connected to a source of a first MOS transistor in the auxiliary power supply circuit to access the auxiliary voltage VCC; the ground connection interface of the voltage reference chip is connected with the negative bus, the output interface of the voltage reference chip is connected to the overvoltage detection circuit through the fourth resistor, the second capacitor and the fifth resistor which are sequentially connected are connected to the overvoltage detection circuit, and the second capacitor and the fifth resistor are both connected to the negative bus.
The working principle of the reference voltage circuit is as follows: the auxiliary voltage VCC obtains a reference voltage through a voltage reference chip U3, the reference voltage is filtered by a second capacitor C2, so that a reference voltage with very high quality is obtained, and then the voltage is divided by a fourth resistor R6 and a fifth resistor R7, so that a final reference voltage VREF is obtained and is used by an overvoltage detection circuit.
As shown in fig. 2, the voltage detection circuit includes a sixth resistor R1, a seventh resistor R15, and a third capacitor C3, and the positive bus and the negative bus are connected through the sixth resistor and the seventh resistor connected in series, where the sixth resistor is connected to the positive bus, the seventh resistor is connected to the negative bus, the third capacitor is connected in parallel with the seventh resistor, one end of the third capacitor is connected to the negative bus, and the other end is connected to the seventh resistor, the sixth resistor, and the overvoltage detection circuit.
The principle of the voltage detection circuit is as follows: the sixth resistor R1 and the seventh resistor R15 are used for detecting the input voltage, converting the input voltage into a low voltage signal and sending the low voltage signal to the overvoltage detection circuit for processing. C3 is filter capacitor, R1 and C3 compose RC filter circuit, filter low voltage signal, filter out voltage spike and input voltage spike in ultra short time caused by interference, only allow voltage spike in longer time, then send low voltage signal to over-voltage detection circuit to process, thus absorb voltage spike of longer time and larger energy on input wire.
As shown in fig. 2, the overvoltage detection circuit includes a comparator U1, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. A power supply pin of the comparator U1 is connected with a source electrode of a first MOS tube in the auxiliary power supply circuit so as to be connected with an auxiliary voltage VCC, and a grounding pin of the comparator U1 is connected with a negative bus; the inverting input end of the comparator is connected with a fourth resistor R6 and a fifth resistor R7 in the reference voltage circuit through an eighth resistor to obtain a reference voltage VRFF; the non-inverting input end of the comparator is connected with one end of a third capacitor in the voltage detection circuit through a ninth resistor, wherein the third capacitor is used for being connected with one end of a seventh resistor and one end of a sixth resistor so as to obtain a low-voltage signal; the output end of the comparator is connected with the driving circuit and the source electrode of the first MOS tube in the auxiliary power supply circuit through an eleventh resistor, and the output end of the comparator is also connected with the non-inverting input end of the comparator through a tenth resistor.
The working principle of the overvoltage detection circuit is as follows: the comparator U1 receives the low voltage signal from the voltage detection circuit through the ninth resistor R9, receives the reference voltage VRFF from the reference voltage circuit through the eighth resistor R8, and then compares and judges the low voltage signal and the reference voltage VRFF, so as to send out a driving signal to control the driving circuit; the eleventh resistor R11 is a pull-up resistor at the output end of the comparator U1; r10 is the hysteresis resistor of comparator U1 and is used to prevent U1 from malfunctioning.
As shown in fig. 2, the driving circuit includes a driving amplifier U2, a twelfth resistor R12 and a thirteenth resistor R13, a power supply pin of the driving amplifier U2 is connected to a source of a first MOS transistor in the auxiliary power supply circuit to access an auxiliary voltage VCC, and a ground pin of the driving amplifier U2 is connected to the negative bus; the input end of the driving amplifier is connected with the output end of the comparator in the overvoltage detection circuit and the eleventh resistor R11 through the twelfth resistor, and the output end of the driving amplifier is connected with the energy absorption circuit through the thirteenth resistor.
The working principle of the driving circuit is as follows: the driving circuit receives the driving signal sent by the overvoltage detection circuit through the twelfth resistor R12, the driving amplifier U2 performs voltage and power matching amplification on the driving signal, and then the driving circuit outputs a power driving signal to the energy absorption circuit through the thirteenth resistor R13 so as to drive the energy absorption circuit. The U2 is a driving amplifier for the switching element (i.e., Q2) in the energy absorption circuit, and is mainly used for power matching driving.
As shown in fig. 2, the energy absorption circuit includes a fourteenth resistor R2, a fifteenth resistor R14 and a second MOS transistor Q2, the drain of the second MOS transistor is connected to the positive bus through the fourteenth resistor, the gate of the second MOS transistor is connected to the thirteenth resistor R13 in the driving circuit, and is connected to the negative bus through the fifteenth resistor, and the source of the second MOS transistor is connected to the negative bus. Here, the second MOS transistor is an N-channel MOS transistor.
The working principle of the energy absorption circuit is as follows: the energy absorption circuit receives a power driving signal sent by the driving circuit so as to drive the second MOS tube Q2, the input voltage spike energy passes through the fourteenth resistor R2 and the second MOS tube Q2, and the energy is consumed on the fourteenth resistor R2, so that the rear-stage terminal equipment is protected from the impact of the voltage spike, and the rear-stage terminal equipment is effectively protected. The resistor R14 is a static gate protection resistor of the second MOS transistor Q2, and protects the second MOS transistor Q2 from being affected by static electricity and misconducted.
The overvoltage protection system can be added in front of the input port of the terminal equipment, and voltage spikes with large energy on the power transmission line are absorbed, so that the terminal equipment is protected from being damaged by the voltage spikes, the rear-stage terminal equipment is effectively protected, and the reliability of the terminal equipment is improved.
In addition, the overvoltage protection system of the embodiment can work together with a conventional TVS tube, an anti-detonator, a piezoresistor and the like, wherein the TVS tube, the anti-detonator, the piezoresistor and the like are connected in parallel to a positive bus and a negative bus, namely, one ends of the elements are connected with the positive bus, the other ends of the elements are connected with the negative bus, voltage spikes of high voltage and ultrashort time are absorbed by the conventional TVS tube, the anti-detonator and the piezoresistor, and voltage spikes of slightly lower voltage and longer time are absorbed by the overvoltage protection system of the embodiment, so that a more perfect voltage spike absorption circuit is formed together.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (7)
1. An overvoltage protection system for high-voltage direct-current constant-current input is characterized by comprising an auxiliary power supply circuit, a reference voltage circuit, a voltage detection circuit, an overvoltage detection circuit, a driving circuit and an energy absorption circuit, wherein,
the auxiliary power circuit is connected with the positive and negative buses for transmitting high voltage, is connected with the reference voltage circuit, the overvoltage detection circuit and the drive circuit, and respectively provides low-voltage auxiliary power converted from the input high voltage to the reference voltage circuit, the overvoltage detection circuit and the drive circuit;
the reference voltage circuit generates reference voltage, is connected with the overvoltage detection circuit and sends the reference voltage to the overvoltage detection circuit;
the voltage detection circuit is connected with the positive and negative buses, generates a low-voltage signal, and is connected with the overvoltage detection circuit and sends the low-voltage signal to the overvoltage detection circuit;
the overvoltage detection circuit is connected with the energy absorption circuit through the driving circuit, the energy absorption circuit is connected with the positive and negative buses, the overvoltage detection circuit generates a driving signal and sends the driving signal to the driving circuit, and the energy absorption circuit is driven through the driving circuit.
2. The high-voltage direct-current constant-current input overvoltage protection system according to claim 1, wherein the auxiliary power supply circuit comprises a first resistor, a second resistor, a third resistor, a first voltage-stabilizing diode, a second voltage-stabilizing diode, a first capacitor and a first MOS (metal oxide semiconductor) transistor;
one end of the first resistor is connected with the positive bus, the other end of the first resistor is connected with the grid of the first MOS tube, the grid of the first MOS tube is also connected with the cathode of the first voltage stabilizing diode, and the anode of the first voltage stabilizing diode is connected with the negative bus; one end of the second resistor is connected with the positive bus, and the other end of the second resistor is connected with the drain electrode of the first MOS tube; the cathode of the second voltage stabilizing diode is connected with the source electrode of the first MOS tube, and the anode of the second voltage stabilizing diode is connected with the negative bus; one end of the third resistor is connected with the positive bus, and the other end of the third resistor is connected with the source electrode of the first MOS tube; the source electrode of the first MOS tube is connected with a reference voltage circuit; one end of the first capacitor is connected with the source electrode of the first MOS tube and the reference voltage circuit, and the other end of the first capacitor is connected with the negative bus.
3. The overvoltage protection system for high-voltage direct current constant current input according to claim 1, wherein the reference voltage circuit comprises a voltage reference chip, a second capacitor, a fourth resistor and a fifth resistor, an input interface of the voltage reference chip is connected with the auxiliary power circuit, a ground interface of the voltage reference chip is connected with the negative bus, an output interface of the voltage reference chip is connected to the overvoltage detection circuit through the fourth resistor, and is connected to the overvoltage detection circuit through the second capacitor and the fifth resistor which are connected in sequence, and the second capacitor and the fifth resistor are both connected to the negative bus.
4. The high-voltage direct current constant current input overvoltage protection system according to claim 1, wherein the voltage detection circuit comprises a sixth resistor, a seventh resistor and a third capacitor, the positive bus and the negative bus are connected through the sixth resistor and the seventh resistor which are connected in series, the sixth resistor is connected with the positive bus, the seventh resistor is connected with the negative bus, the third capacitor is connected with the seventh resistor in parallel, one end of the third capacitor is connected with the negative bus, and the other end of the third capacitor is connected with the seventh resistor, the sixth resistor and the overvoltage detection circuit.
5. The high-voltage direct current constant current input overvoltage protection system according to claim 1, wherein the overvoltage detection circuit comprises a comparator, an eighth resistor, a ninth resistor, a tenth resistor and an eleventh resistor;
the inverting input end of the comparator is connected with the reference voltage circuit through an eighth resistor, the non-inverting input end of the comparator is connected with the voltage detection circuit through a ninth resistor, the output end of the comparator is connected with the driving circuit, is connected with the auxiliary power supply circuit through an eleventh resistor, and is connected with the non-inverting input end of the comparator through a tenth resistor.
6. The high-voltage direct current constant current input overvoltage protection system according to claim 1, wherein the driving circuit comprises a driving amplifier, a twelfth resistor and a thirteenth resistor, an input end of the driving amplifier is connected with the overvoltage detection circuit through the twelfth resistor, and an output end of the driving amplifier is connected with the energy absorption circuit through the thirteenth resistor.
7. The high-voltage direct-current constant-current input overvoltage protection system according to claim 1, wherein the energy absorption circuit comprises a fourteenth resistor, a fifteenth resistor and a second MOS (metal oxide semiconductor), a drain electrode of the second MOS is connected with the positive bus through the fourteenth resistor, a gate electrode of the second MOS is connected with the driving circuit and is connected with the negative bus through the fifteenth resistor, and a source electrode of the second MOS is connected with the negative bus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023042632.4U CN214069574U (en) | 2020-12-15 | 2020-12-15 | Overvoltage protection system for high-voltage direct-current constant-current input |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023042632.4U CN214069574U (en) | 2020-12-15 | 2020-12-15 | Overvoltage protection system for high-voltage direct-current constant-current input |
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| CN214069574U true CN214069574U (en) | 2021-08-27 |
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| CN202023042632.4U Active CN214069574U (en) | 2020-12-15 | 2020-12-15 | Overvoltage protection system for high-voltage direct-current constant-current input |
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