CN214069570U - Overcurrent protection system for high-voltage direct-current constant-current input - Google Patents
Overcurrent protection system for high-voltage direct-current constant-current input Download PDFInfo
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- CN214069570U CN214069570U CN202023042646.6U CN202023042646U CN214069570U CN 214069570 U CN214069570 U CN 214069570U CN 202023042646 U CN202023042646 U CN 202023042646U CN 214069570 U CN214069570 U CN 214069570U
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Abstract
The utility model discloses a high voltage direct current constant current input overcurrent protection system, which comprises an auxiliary power circuit, a reference voltage circuit, a current detection circuit, an overcurrent detection circuit, a drive circuit and an energy absorption circuit, wherein the auxiliary power circuit is connected with high voltage, and is connected with the reference voltage circuit, the overcurrent detection circuit and the drive circuit, and respectively provides low voltage auxiliary power for the circuits; the reference voltage circuit is connected with the overcurrent detection circuit and sends reference voltage to the overcurrent detection circuit; the current detection circuit is connected with a negative bus for transmitting high voltage and the overcurrent detection circuit and sends a voltage signal to the overcurrent detection circuit; the overcurrent detection circuit is connected with the energy absorption circuit through the driving circuit, the energy absorption circuit is connected with the positive and negative electrode buses for transmitting high voltage, and the overcurrent detection circuit sends a driving signal to the driving circuit and drives the energy absorption circuit through the driving circuit. The utility model discloses can prevent that back-stage terminal equipment from receiving the impact of heavy current.
Description
Technical Field
The utility model relates to a high voltage direct current constant current transmission technical field, in particular to overcurrent 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 existing 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, and current on the power transmission cable generates large current surge, so that 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 a overcurrent protection system of high voltage direct current constant current input, this system can absorb the great current surge on the power transmission line, prevents that back level terminal equipment from receiving the impact of heavy current, has effectively protected back level terminal equipment.
The purpose of the utility model is realized through the following technical scheme: an over-current protection system for high-voltage direct-current constant-current input comprises an auxiliary power supply circuit, a reference voltage circuit, a current detection circuit, an over-current detection circuit, a drive circuit and an energy absorption circuit,
the auxiliary power circuit is connected with the positive and negative buses for transmitting high voltage, is connected with the reference voltage circuit, the overcurrent 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 overcurrent detection circuit and the drive circuit;
the reference voltage circuit generates reference voltage, is connected with the over-current detection circuit and sends the reference voltage to the over-current detection circuit;
the current detection circuit is connected in series with the negative bus and acquires an input current signal, and the current detection circuit is connected with the overcurrent detection circuit and sends a voltage signal converted from the input current signal to the overcurrent detection circuit;
the overcurrent detection circuit is connected with the energy absorption circuit through the drive circuit, the energy absorption circuit is connected with the positive bus and the negative bus which is connected with the current detection circuit, the overcurrent detection circuit generates a drive signal and sends the drive signal to the drive circuit, and the drive circuit drives the energy absorption 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 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 overcurrent detection circuit through the fourth resistor, the output interface of the voltage reference chip is connected to the overcurrent 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 current detection circuit comprises a sixth resistor, and the sixth resistor is connected in series with the negative bus and is also connected with the overcurrent detection circuit.
Preferably, the over-current detection circuit comprises a comparator, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor;
the inverting input end of the comparator is connected with the reference voltage circuit through a seventh resistor, the non-inverting input end of the comparator is connected with the current detection circuit and the negative bus which is connected with the current detection circuit through an eighth resistor, the output end of the comparator is connected with the driving circuit, the auxiliary power supply circuit through a tenth resistor, and the non-inverting input end of the comparator is connected through a ninth resistor.
Preferably, the driving circuit comprises a driving amplifier, an eleventh resistor and a twelfth resistor, the input end of the driving amplifier is connected with the over-current detection circuit through the eleventh resistor, and the output end of the driving amplifier is connected with the energy absorption circuit through the twelfth resistor.
Preferably, the energy absorption circuit comprises a thirteenth resistor, a fourteenth resistor and a second MOS transistor, a drain of the second MOS transistor is connected to the positive bus through the thirteenth resistor, a gate of the second MOS transistor is connected to the driving circuit and the negative bus connected to the current detection circuit through the fourteenth resistor, and a source of the second MOS transistor is connected to the negative bus connected to the current detection circuit.
The utility model discloses for prior art have following advantage and effect:
(1) the utility model provides a high voltage direct current constant current input's overcurrent protection system can detect the electric current on the input bus through this system, when the electric current increases the protective value suddenly, can fall the energy absorption of input to shift big current return circuit to the circuit in, protect rear terminal equipment not receive the impact of heavy current, thereby protected rear terminal equipment effectively, ensured rear terminal equipment's safe in utilization.
(2) The utility model discloses overcurrent 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, advantage that the reliability is high, because the singlechip will write into certain procedure into, 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 possibility that the singlechip got into other procedures, so adopt pure hardware circuit just not have the existence of above-mentioned trouble, can improve circuit's reliability greatly.
(3) The utility model discloses overcurrent 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 overcurrent protection system comprises pure hardware circuit, and on the selection of domestic device, there are a lot of-55 ℃ to 125 ℃ of temperature within range'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, 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 overcurrent protection circuit's wiring is also simpler, only needs to connect three lines (input positive pole, input negative pole, output negative pole) can work.
Drawings
Fig. 1 is a schematic block diagram of the overcurrent protection system for high-voltage direct-current constant-current input of the present invention.
FIG. 2 is a circuit diagram of an embodiment overcurrent 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 overcurrent protection system for high-voltage direct-current constant-current input, which comprises an auxiliary power supply circuit, a reference voltage circuit, a current detection circuit, an overcurrent 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 overcurrent detection circuit and the drive circuit, and supplies low-voltage auxiliary power to the reference voltage circuit, the overcurrent detection circuit and the drive circuit for use.
The reference voltage circuit is used for generating reference voltage, is connected with the overcurrent detection circuit and sends the reference voltage to the overcurrent detection circuit so as to compare and judge the overcurrent signal.
The current detection circuit is connected in series with the negative bus and acquires an input current signal, and is used for detecting the current signal and converting the current signal into a voltage signal; the current detection circuit is connected with the overcurrent detection circuit and sends the converted voltage signal to the overcurrent detection circuit.
The over-current detection circuit is connected with the energy absorption circuit through the driving circuit and is used for receiving the voltage signal sent by the current detection circuit and the reference voltage sent by the reference voltage circuit, and then comparing and judging the 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 which is connected with the current detection circuit, and is used for receiving a driving signal sent by the driving circuit so as to drive a switching device of the energy absorption circuit, absorb the input energy and transfer a large current loop into the energy absorption circuit, thereby protecting the rear-stage terminal equipment from being impacted by large current.
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 overcurrent 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 a dynamic and high-power stable power supply voltage for the overcurrent detection circuit, the reference voltage circuit and the drive circuit when the whole protection circuit enters an overcurrent protection state. When overcurrent protection is performed, the energy absorption circuit works to pull down the input voltage, and through the combined action of R4, Q1 and C1, sufficient auxiliary voltage can be provided for other circuits to use, and when the whole protection circuit does not enter an overcurrent protection state, the voltage of Z2 is higher than that of Z1, so that 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 overcurrent detection circuit through the fourth resistor, the second capacitor and the fifth resistor which are sequentially connected are connected to the overcurrent 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 reference 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 overcurrent detection circuit.
As shown in fig. 2, the current detection circuit includes a sixth resistor R1, the sixth resistor is connected in series to the negative bus, the negative bus connected to the sixth resistor may be referred to as an output negative bus, and the sixth resistor is also connected to the overcurrent detection circuit. The sixth resistor R1 is used as a current sampling resistor for detecting the input current and converting the current signal into a voltage signal, which is sent to the over-current detection circuit for processing.
As shown in fig. 2, the overcurrent detection circuit includes a comparator U1, a seventh resistor R8, an eighth resistor R9, a ninth resistor R10, and a tenth 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 a seventh resistor to obtain a reference voltage VRFF; the non-inverting input end of the comparator is connected with a sixth resistor R1 through an eighth resistor R9 to obtain a voltage signal converted from input current, and is also connected with a negative bus connected with the current detection circuit; 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 a tenth resistor R11, and the output end of the comparator is also connected with the non-inverting input end of the comparator through a ninth resistor R10.
The operating principle of the over-current detection circuit is as follows: the comparator U1 receives the voltage signal sent by the current detection circuit through the eighth resistor R9, receives the reference voltage VRFF sent by the reference voltage circuit through the seventh resistor R8, and then compares and judges the voltage signal and the reference voltage VRFF so as to send out a driving signal to control the driving circuit; the tenth resistor R11 is a pull-up resistor at the output terminal 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, an eleventh resistor R12, and a twelfth 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 receive 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 overcurrent detection circuit and a tenth resistor R11 through an eleventh resistor, and the output end of the driving amplifier is connected with the energy absorption circuit through a twelfth resistor.
The working principle of the driving circuit is as follows: the driving circuit receives the driving signal sent by the overcurrent detection circuit through an eleventh resistor R12, and after the driving amplifier U2 performs voltage and power matching amplification on the driving signal, the driving circuit outputs a power driving signal to the energy absorption circuit through a twelfth 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 thirteenth resistor R2, a fourteenth resistor R14 and a second MOS transistor Q2, the drain of the second MOS transistor is connected to the positive bus through the thirteenth resistor, the gate of the second MOS transistor is connected to the twelfth resistor R13 in the driving circuit, and is connected to the negative bus that has been connected to the current detection circuit through the fourteenth resistor, and the source of the second MOS transistor is connected to the negative bus that has been connected to the current detection circuit. 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 transistor Q2, the input current passes through R2 and Q2, energy is consumed on the resistor R2 through the current sampling resistor R1, a large current loop is transferred into the energy absorption circuit, the rear-stage terminal equipment is protected from the impact of large current, 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 overcurrent protection system can be added in front of the input port of the terminal equipment, and can protect the terminal equipment from being damaged by current surge by absorbing the large current surge on the power transmission line, thereby effectively protecting the rear-stage terminal equipment and improving the reliability of the terminal equipment.
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 overcurrent protection system for high-voltage direct-current constant-current input is characterized by comprising an auxiliary power supply circuit, a reference voltage circuit, a current detection circuit, an overcurrent 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 overcurrent 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 overcurrent detection circuit and the drive circuit;
the reference voltage circuit generates reference voltage, is connected with the over-current detection circuit and sends the reference voltage to the over-current detection circuit;
the current detection circuit is connected in series with the negative bus and acquires an input current signal, and the current detection circuit is connected with the overcurrent detection circuit and sends a voltage signal converted from the input current signal to the overcurrent detection circuit;
the overcurrent detection circuit is connected with the energy absorption circuit through the drive circuit, the energy absorption circuit is connected with the positive bus and the negative bus which is connected with the current detection circuit, the overcurrent detection circuit generates a drive signal and sends the drive signal to the drive circuit, and the drive circuit drives the energy absorption circuit.
2. The high-voltage direct-current constant-current input overcurrent 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 high-voltage direct-current constant-current input overcurrent protection system 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 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 with the overcurrent detection circuit through the fourth resistor, and is connected with the overcurrent 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 with the negative bus.
4. The high-voltage direct-current constant-current input overcurrent protection system according to claim 1, wherein the current detection circuit comprises a sixth resistor, the sixth resistor is connected in series with the negative bus, and the sixth resistor is also connected with the overcurrent detection circuit.
5. The high-voltage direct-current constant-current input overcurrent protection system according to claim 1, wherein the overcurrent detection circuit comprises a comparator, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor;
the inverting input end of the comparator is connected with the reference voltage circuit through a seventh resistor, the non-inverting input end of the comparator is connected with the current detection circuit and the negative bus which is connected with the current detection circuit through an eighth resistor, the output end of the comparator is connected with the driving circuit, the auxiliary power supply circuit through a tenth resistor, and the non-inverting input end of the comparator is connected through a ninth resistor.
6. The high-voltage direct current constant current input overcurrent protection system according to claim 1, wherein the drive circuit comprises a drive amplifier, an eleventh resistor and a twelfth resistor, an input end of the drive amplifier is connected with the overcurrent detection circuit through the eleventh resistor, and an output end of the drive amplifier is connected with the energy absorption circuit through the twelfth resistor.
7. The high-voltage direct-current constant-current input overcurrent protection system according to claim 1, wherein the energy absorption circuit comprises a thirteenth resistor, a fourteenth resistor and a second MOS (metal oxide semiconductor), a drain electrode of the second MOS is connected with a positive bus through the thirteenth resistor, a gate electrode of the second MOS is connected with the drive circuit and a negative bus which is connected with the current detection circuit through the fourteenth resistor, and a source electrode of the second MOS is connected with the negative bus which is connected with the current detection circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023042646.6U CN214069570U (en) | 2020-12-15 | 2020-12-15 | Overcurrent protection system for high-voltage direct-current constant-current input |
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| CN202023042646.6U CN214069570U (en) | 2020-12-15 | 2020-12-15 | Overcurrent protection system for high-voltage direct-current constant-current input |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114231990A (en) * | 2021-12-16 | 2022-03-25 | 湖南子宏生态科技股份有限公司 | Active metal anti-corrosion protection device |
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2020
- 2020-12-15 CN CN202023042646.6U patent/CN214069570U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114231990A (en) * | 2021-12-16 | 2022-03-25 | 湖南子宏生态科技股份有限公司 | Active metal anti-corrosion protection device |
| CN114231990B (en) * | 2021-12-16 | 2023-10-31 | 湖南子宏生态科技股份有限公司 | Active metal anti-corrosion protection device |
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