CN212367121U - Circuit applied to underwater power supply protection and current detection - Google Patents
Circuit applied to underwater power supply protection and current detection Download PDFInfo
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- CN212367121U CN212367121U CN202022031591.2U CN202022031591U CN212367121U CN 212367121 U CN212367121 U CN 212367121U CN 202022031591 U CN202022031591 U CN 202022031591U CN 212367121 U CN212367121 U CN 212367121U
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Abstract
The utility model provides a be applied to the circuit of power supply protection and current detection under water, wherein, the positive voltage input pin of protection chip is connected with one end and the direct current input power of sampling resistor, the sampling current input pin of protection chip is connected with the other end of sampling resistor and the drain electrode of N-MOS pipe, the grid drive output pin of protection chip is connected with the grid of N-MOS pipe, the output feedback pin of protection chip is connected with the source electrode of N-MOS pipe; a first voltage division node in the voltage division device is connected with an under-voltage locking pin of the protection chip, and a second voltage division node in the voltage division device is connected with the over-voltage locking pin of the protection chip; and a high potential input pin and a low potential input pin of the instrument amplifier chip are respectively connected with two ends of the sampling resistor. Compared with the prior art, the beneficial effects of the utility model reside in that: the circuit has high function integration level, and the circuit structure is simplified on the premise of not sacrificing performance, so that the circuit is suitable for deep-sea high-voltage environment.
Description
Technical Field
The utility model relates to an electronic circuit design technical field, concretely relates to be applied to circuit of underwater power supply protection and current detection.
Background
In the process of developing deep sea electronic equipment, one of the development and design criteria is as follows: the electronic equipment is required to be small in size and light in weight under the condition of ensuring that the performance is not sacrificed. This requires that the electronic equipment be able to be housed in a small, non-pressure-resistant compartment, while the electronic equipment itself is also able to withstand pressure.
In the prior art, a high-power protection circuit and a current detection circuit are designed independently in an overall circuit, and high-power inductors, capacitors, resistors and other devices are generally required to be arranged on the peripheries of the two independently arranged circuits. However, the high-power protection circuit and the current detection circuit in the prior art have obvious defects, and the defects are that the high-power protection circuit and the current detection circuit in the prior art are not suitable for being used in an underwater high-voltage environment, and particularly, the high-power inductor, the capacitor and the resistor used in the high-power protection circuit and the current detection circuit in the prior art have large volumes, and the packaging form cannot resist high voltage, so that the high-power protection circuit and the current detection circuit cannot be used in a voltage-. Meanwhile, the high-power circuit needs extra measures for heat dissipation, so that the occupied area of the circuit is large, the integration level is not high, and the requirement on economy in deep sea application is not met.
Therefore, it is urgently needed to develop a circuit which can be applied underwater and integrates a high-power supply protection function and a high-current detection function.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve the problem that the high-power protection circuit and the current detection circuit in the prior art are not suitable for the deep sea environment, the utility model provides a circuit for underwater power protection and current detection, which comprises a protection chip, a sampling resistor, a N-MOS tube, a voltage divider and an instrumentation amplifier chip, wherein a positive voltage input pin of the protection chip is connected with one end of the sampling resistor and a direct current input power supply, a sampling current input pin of the protection chip is connected with the other end of the sampling resistor and a drain electrode of the N-MOS tube, a gate drive output pin of the protection chip is connected with a gate of the N-MOS tube, and an output feedback pin of the protection chip is connected with a source electrode of the N-MOS tube; the voltage divider is connected with the direct-current input power supply, a first voltage dividing node in the voltage divider is connected with an under-voltage locking pin of the protection chip, and a second voltage dividing node in the voltage divider is connected with an over-voltage locking pin of the protection chip; the instrumentation amplifier chip is used for detecting current, and a high potential input pin and a low potential input pin of the instrumentation amplifier chip are respectively connected with two ends of the sampling resistor.
Preferably, the direct current input power supply further comprises a first diode and a second diode, wherein the first diode and the second diode are TVS diodes, the first diode is connected in parallel with the voltage divider, and a cathode of the first diode is connected with the direct current input power supply; and the cathode of the second diode is connected with a sampling current input pin of the protection chip.
Preferably, the voltage divider further comprises a first capacitor and a second capacitor, and the first capacitor, the second capacitor and the voltage divider are connected in parallel; the first capacitor is a ceramic capacitor, the positive electrode of the first capacitor is connected with a direct current input power supply, and the other end of the first capacitor is grounded; the first capacitor and the second capacitor are used for filtering direct current input.
Preferably, the protection circuit further comprises a fourth capacitor and a fifth capacitor, the fourth capacitor and the fifth capacitor are arranged in parallel, the positive electrode of the fourth capacitor is connected with the output feedback pin of the protection chip, and the other end of the fourth capacitor is grounded; the fourth capacitor and the fifth capacitor are used for filtering the output of the protection chip.
Preferably, the voltage divider is a series resistance voltage divider, which includes a first resistor, a second resistor and a third resistor sequentially connected in series, the first voltage dividing node is disposed between the first resistor and the second resistor, and the second voltage dividing node is disposed between the second resistor and the third resistor; the other end of the first resistor is connected with the direct current input power supply, and the other end of the third resistor is grounded.
Preferably, the protection circuit further comprises a fourth resistor and a sixth capacitor, wherein one end of the fourth resistor is connected with the power limit setting pin of the protection chip, and the other end of the fourth resistor is grounded; one end of the sixth capacitor is connected with the time sequence capacitor pin of the protection chip, the other end of the sixth capacitor is grounded, and the ground pin of the protection chip is grounded.
Preferably, the protection circuit further comprises a third capacitor and a fifth resistor, wherein one end of the third capacitor C3 is connected to the positive voltage input pin of the protection chip, and the other end is grounded; and two ends of the fifth resistor are respectively connected with a power normal indication signal pin and an output feedback pin of the protection chip.
Preferably, a high potential input pin and a low potential input pin of the instrumentation amplifier chip are connected with the sampling resistor through an input filter network, and the input filter network includes a seventh capacitor, a tenth resistor and an eleventh resistor; two ends of the seventh capacitor are respectively connected with a high potential input pin and a low potential input pin of the instrumentation amplifier chip; one end of the tenth resistor is connected with a low-potential input pin of the instrumentation amplifier chip, and the other end of the tenth resistor is connected with one low-potential end of the sampling resistor; one end of the eleventh resistor is connected with a high potential input pin of the instrumentation amplifier chip, and the other end of the eleventh resistor is connected with one high potential end of the sampling resistor.
Preferably, a first reference voltage input pin and a second reference voltage input pin of the instrumentation amplifier chip are both connected to an input reference voltage; the grounding pin of the instrumentation amplifier chip is grounded; an eighth capacitor is arranged between the grounding pin and the second reference voltage input pin; and a voltage output pin of the instrumentation amplifier chip and an AD (analog-to-digital) converter.
Preferably, the protection chip is an LM5069 chip; the instrumentation amplifier chip is an INA240A2D chip.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model provides a pair of be applied to underwater power supply protection and current detection's circuit with high-power supply protection and heavy current detection function integration in an organic whole, under the prerequisite that does not sacrifice the performance, the circuit structure who simplifies in the very big degree. Thereby making the circuit suitable for deep sea high voltage environment. When the circuit is applied, the characteristic of low temperature in deep sea can be utilized, so that additional heat dissipation measures are not additionally arranged, the size and the weight of related electronic equipment are further effectively reduced, and the circuit has higher economical efficiency on underwater electronic equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a circuit diagram of a circuit applied to underwater power supply protection and current detection in the present invention.
Reference numerals:
protection chip U1, instrumentation amplifier chip U2, sampling resistor RsenseThe N-MOS transistor Q1, the voltage divider 100, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the tenth resistor R10, the eleventh resistor R11, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the first diode D1, the second diode D1Tube D2, voltage divider 100, and input filter network 200.
Detailed Description
The above and further features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention.
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
Example one
The embodiment of the utility model provides an in provide a be applied to power supply protection and current detection's circuit under water, it includes protection chip U1, sampling resistance RsenseThe device comprises an N-MOS tube Q1, an instrumentation amplifier chip U2 and a voltage divider 100.
The structure formed by the protection chip U1 and the discrete components of the peripheral capacitor and the resistor provides a high-power supply protection function.
The instrumentation amplifier chip U2 detects the sampling resistance RsenseThe voltage change across the terminals measures the current. The structure formed by the instrumentation amplifier chip U2 and the discrete components of the peripheral capacitor and resistor provides a high-current detection function.
Positive voltage input pin and sampling resistor R of protection chip U1senseOne end of which is connected with a direct current input power supply.
Sampling current input pin and sampling resistor R of protection chip U1senseThe other end of the N-MOS transistor is connected with a drain electrode D of an N-MOS transistor Q1.
The gate drive output pin of the protection chip U1 is connected to the gate G of the N-MOS transistor Q1.
An output feedback pin of the protection chip U1 is connected with a source S and a load of the N-MOS transistor Q1. The other end of the load is grounded.
High potential input of instrumentation amplifier chip U2Pin and sampling resistor RsenseThe high potential end is connected with the positive voltage input pin of the protection chip U1. Low potential input pin and sampling resistor R of instrument amplifier chip U2senseThe low potential is connected to one end, namely, the sampling current input pin of the protection chip U1.
One end of the voltage divider 100 is connected to the dc input power source, and the other end is grounded. A first voltage division node and a second voltage division node are arranged in the voltage division device. The first voltage division node is higher than the second voltage division node. The first voltage division node is connected with an undervoltage locking pin of the protection chip U1. The second voltage division node is connected with an overvoltage locking pin of the protection chip U1.
The beneficial effects of the utility model reside in that: the utility model provides a pair of high-power protection and heavy current detection circuitry, its form through multiplexing peripheral discrete component is in the same place high-power protection and heavy current detection function integration. Greatly simplifying the circuit complexity. The utility model discloses be integrated as an organic whole high-power (3000W or less) protection circuit and heavy current (-100A- +100A) detection circuitry, can also further utilize for example can withstand voltage ceramic chip capacitance resistance to realize peripheral circuit's configuration.
The circuit is mainly applied to electronic equipment under the deep sea pressure-resistant condition, and because the electronic equipment works under the pressure-resistant condition, the working environment temperature of the electronic equipment is balanced with the deep sea environment temperature, the high-power protection circuit can be radiated by utilizing the deep sea (the water depth of 500m is less than or equal to 10 ℃) low-temperature environment. By utilizing the characteristic of low deep sea temperature (less than or equal to 10 ℃), when the current exceeds 30A, additional heat dissipation measures are not required, the volume and the weight of the electronic equipment are effectively reduced, and the underwater electronic equipment has higher economy; under the condition of input current less than 30A, the device can work normally at normal temperature. Therefore, under the condition of not reducing the performance, the occupied volume of the circuit is greatly reduced, and the economy of deep sea application is improved.
Example two
The difference between this embodiment and the first embodiment is:
preferably, the voltage divider is a series resistance voltage divider, which includes a first resistorThe voltage divider comprises a resistor R1, a second resistor R2 and a third resistor R3, wherein the first resistor R1, the second resistor R2 and the third resistor R3 are sequentially arranged in series, a first voltage dividing node is arranged between the first resistor R1 and the second resistor R2, and a second voltage dividing node is arranged between the second resistor R2 and the third resistor R3. A first resistor R1The other end of the second switch is connected with a direct current input power supply. The other end of the third resistor R3 is connected to ground. The first resistor R1, the second resistor R2 and the third resistor R3 divide the voltage input by the direct current input power supply and input the divided voltage to the protection chip U1.
The first capacitor C1, the second capacitor C2, the first diode D1 and the voltage divider are connected in parallel. Namely, the positive electrode of the first capacitor C1 is connected to the dc input power source, and the negative electrode thereof is grounded. One end of the second capacitor C2 is connected to the dc input power supply, and the other end is grounded. The anode of the first diode D1 is grounded, and the cathode is connected with a direct current input power supply.
The first capacitor C1 and the second capacitor C2 are used for filtering the direct current input power supply. The capacitor is a ceramic chip capacitor capable of resisting underwater pressure, and preferably, the capacitance value of the first capacitor C1 is 47uF, and the pressure resistance value is 100V. The second capacitor C2 has a capacitance of 0.1-0.22 uF and a withstand voltage of 100V.
Preferably, the first diode D1 is a TVS diode, which performs an overvoltage clamp when its input voltage exceeds a clamping voltage, and protects the rear protection chip U1 from overvoltage surge. Further preferably, the TVS diode clamping voltage does not exceed 75V.
The utility model provides a circuit still includes fourth electric capacity C4 and fifth electric capacity C5, fourth electric capacity C4 and fifth electric capacity C5 and is used for filtering the DC power supply of protecting chip U1 output. The cathode of the fourth capacitor C4 and the other end of the fifth capacitor C5 are both grounded. One end of the fifth capacitor C5 and the anode of the fourth capacitor C4 are both connected to the output feedback pin of the protection chip U1. The capacitor is a ceramic chip capacitor capable of resisting underwater pressure, and preferably, the capacitance value of the fourth capacitor C4 is 47uF, and the pressure resistance value is 100V. The capacitance of the fifth capacitor C5 is 0.1-0.22 uF and the withstand voltage is 100V.
The utility model provides a circuit still includes fourth resistance R4 and sixth electric capacity C6. One end of the fourth resistor R4 is connected with the power limit setting pin of the protection chip U1, and the other end is grounded. One end of the sixth capacitor C6 is connected to the timing capacitor pin of the protection chip U1, and the other end is grounded. The ground pin of the protection chip U1 is grounded.
The utility model provides a circuit still includes fifth resistance R5, and fifth resistance R5 both ends are connected with protection chip U1's normal pilot signal pin of power and output feedback pin respectively.
The utility model provides a circuit still includes third electric capacity C3. One end of the third capacitor C3 is connected to the dc input power supply, and the other end is connected to ground.
The protection chip U1 sets corresponding threshold value through peripheral capacitance and resistance discrete component, controls the conduction of N-MOS pipe Q1 to achieve the purpose of power protection. Selecting proper sampling resistor RsenseAnd Q1, the utility model provides a circuit can satisfy 9 ~ 75V voltage input and 100A's current detection ability.
The protection chip U1 detects the voltage of the undervoltage locking pin and the overvoltage locking pin to determine the threshold values of the high-voltage locking protection and the low-voltage locking protection, and the protection chip U1 closes the grid electrode of the N-MOS tube to prohibit the power supply output when the threshold values are exceeded.
Wherein the high voltage locking threshold VuvloRepresented by the formula:
wherein the low voltage locks the threshold value VovloRepresented by the formula:
v in the above two formulasinThe voltage of the direct current input power supply.
In addition, the overcurrent protection threshold I of the protection chip U1limRepresented by the formula:
sampling resistor RsenseThe specific resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 can be flexibly set according to actual requirements.
The value of the sixth capacitor C6 determines the maximum time t allowed for the current limit when a fault exceeding a set threshold occursflt，tfltRepresented by the formula:
in addition, the protection chip U1 provides programmable power protection for the N-MOS transistor Q1, ensuring that the power dissipation of the N-MOS transistor Q1 itself does not exceed its rated value. The threshold of the power protection is specifically determined by the performance parameters of the N-MOS transistor Q1, and the protection chip U1 programs the power threshold P through the fourth resistor R4lim，PlimRepresented by the formula:
wherein, VDSIs a typical value for the source-drain voltage of the N-MOS transistor Q1.
Preferably, the protection chip U1 is an LM5069 chip, and the 1 st pin of the LM5069 chip is a SENSE pin, i.e., a sampling current input pin; the 2 nd pin is a VIN pin, namely a positive voltage input pin; the 3 rd pin is a UVLO pin, namely an undervoltage locking pin; the 4 th pin is an OVLO pin, namely an overvoltage locking pin; the 4 th pin is a GND pin, i.e., a ground pin. The 6 th pin is a TIMER pin, i.e., a timing capacitor pin. The 7 th pin is a PWR pin, i.e., a power limit setting pin. The 8 th pin is a PGD pin, i.e., a power ok indicator signal pin. The 9 th pin is an OUT pin, i.e., an output feedback pin. The 10 th pin is a GATE pin, i.e., a GATE drive output pin.
The utility model provides a be applied to underwater power supply protection and current detection's circuit still includes input filter network 200 and second diode D2.
Preferably, the instrumentThe high potential input pin and the low potential input pin of the table amplifier chip U2 pass through the input filter network 200 and the sampling resistor RsenseAnd (4) connecting. The input filter network 200 includes a seventh capacitor C7, a tenth resistor R10, and an eleventh resistor R11. Two ends of the seventh capacitor C7 are connected to a high potential input pin and a low potential input pin of the instrumentation amplifier chip U2, respectively. One end of a tenth resistor R10 is connected with a low potential input pin of the instrumentation amplifier chip U2, and the other end is connected with a sampling resistor RsenseOne end of the low potential is connected. One end of an eleventh resistor R11 is connected with a high potential input pin of an instrumentation amplifier chip U2, and the other end of the eleventh resistor R11 is connected with a sampling resistor RsenseOne end of the high potential is connected.
Preferably, the tenth resistor R10 and the eleventh resistor R11 have the same resistance value, and the resistance value range is 2-5 omega. The capacitance value of the seventh capacitor C7 is selected to be 0.01-0.1 uF.
The anode of the second diode D2 is grounded, the cathode thereof is connected with the sampling resistor RsenseOne end of the low potential is connected. Preferably, the second diode D2 is a TVS diode that is over-voltage clamped when its input voltage exceeds the clamping voltage, protecting the back-end instrumentation amplifier chip U2 from over-voltage surges. Further preferably, the TVS diode clamping voltage does not exceed 75V.
In addition, a first reference voltage input pin and a second reference voltage input pin of the instrumentation amplifier chip U2 are both connected to input reference voltage. The ground pin of instrumentation amplifier chip U2 is grounded. An eighth capacitor C8 is disposed between the ground pin and the second reference voltage input pin. The power supply pin of the instrumentation amplifier chip U2 is connected to a power supply, preferably, the power supply voltage is + 3.3V. And a voltage output pin of the instrumentation amplifier chip U2 and an AD analog-to-digital converter.
Due to the fact that the input voltage ranges of the U1 and the U2 are the same, in the circuit topology, the U1 and the U2 share the D1 and the D2 for input clamp protection.
Detection output voltage V of instrument amplifier chip U2isenseAnd the detected current IsenseThe following linear formula is satisfied:
Visense＝Vref+G×Rsense×Isense；
in the formula IsenseFor the current to be detected, RsenseThe resistance of the sampling resistor is shown, wherein G is the amplification factor of U2, which can be selected, for example, 50, 100 or 200. VrefIs the input reference voltage of U2. The measurement precision of the related current detection is less than or equal to 1 percent, and the measurement range Visense∈[Vref，+3.3V]。
Preferably, instrumentation amplifier chip U2 is an INA240A2D chip. The 1 st pin of the INA240A2D chip is a low potential input pin, i.e., an IN-pin. The 2 nd pin is a ground pin, i.e., a GND pin. The 3 rd pin is a second reference voltage input pin, i.e., the REF2 pin. The 4 th pin is a null pin, namely an NC pin. The 5 th pin is a voltage output pin, i.e., an OUT pin. The 6 th pin is a power supply pin, namely a VS pin. The 7 th pin is a first reference voltage input pin, i.e., the REF1 pin. The 8 th pin is a high input pin, i.e., an IN + pin.
The whole circuit design is divided into two functions of high-power supply protection and large-current detection, the peripheries of U1 and U2 are integrated by multiplexing a small number of discrete components, and the multiplexed small number of discrete components comprise sampling resistors RsenseA first diode D1 and a second diode D2.
U1 and U2 share one sampling resistor RsenseU1 provides a high power supply protection function, and U2 is an instrumentation amplifier for detecting current. Through the combination of peripheral discrete components, the U1 provides high-voltage locking, low-voltage locking and overcurrent protection for a load, and the U2 provides high-voltage locking, low-voltage locking and overcurrent protection for the load through a sampling resistor RsenseWeak voltage signals at two ends are subjected to current-voltage linear conversion, so that the measuring current is output to obtain a corresponding voltage value VisenseThen, the current is digitally converted by an AD converter and then transmitted to the MCU, and the MCU can calculate the current value according to a preset linear mathematical relation.
Since the U2 is used for current detection for a non-isolated Hall chip, the possibility exists that the chip is damaged when the current exceeds the measured value. However, since the U1 has an overcurrent protection function, the U2 does not need an additional overcurrent protection design, thereby simplifying the current detection circuit part.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A circuit applied to underwater power supply protection and current detection is characterized by comprising a protection chip, a sampling resistor, an N-MOS (N-metal oxide semiconductor) tube, a voltage divider and an instrument amplifier chip, wherein a positive voltage input pin of the protection chip is connected with one end of the sampling resistor and a direct current input power supply, a sampling current input pin of the protection chip is connected with the other end of the sampling resistor and a drain electrode of the N-MOS tube, a grid driving output pin of the protection chip is connected with a grid electrode of the N-MOS tube, and an output feedback pin of the protection chip is connected with a source electrode of the N-MOS tube; the voltage divider is connected with the direct-current input power supply, a first voltage dividing node in the voltage divider is connected with an under-voltage locking pin of the protection chip, and a second voltage dividing node in the voltage divider is connected with an over-voltage locking pin of the protection chip; the instrumentation amplifier chip is used for detecting current, and a high potential input pin and a low potential input pin of the instrumentation amplifier chip are respectively connected with two ends of the sampling resistor.
2. The circuit for protection and current detection of a power supply under water as claimed in claim 1, further comprising a first diode and a second diode, said first diode and said second diode being TVS diodes, said first diode being arranged in parallel with a voltage divider means, said first diode having its cathode connected to said dc input power supply; and the cathode of the second diode is connected with a sampling current input pin of the protection chip.
3. The circuit for underwater power supply protection and current sensing as claimed in claim 1, further comprising a first capacitor and a second capacitor, said first capacitor, said second capacitor and said voltage divider being disposed in parallel with each other; the first capacitor is a ceramic capacitor, the positive electrode of the first capacitor is connected with a direct current input power supply, and the other end of the first capacitor is grounded; the first capacitor and the second capacitor are used for filtering direct current input.
4. The circuit for underwater power supply protection and current detection as claimed in claim 1, further comprising a fourth capacitor and a fifth capacitor, wherein said fourth capacitor and said fifth capacitor are arranged in parallel, the anode of said fourth capacitor is connected to the output feedback pin of said protection chip, and the other end is grounded; the fourth capacitor and the fifth capacitor are used for filtering the output of the protection chip.
5. The circuit for underwater power supply protection and current sensing as claimed in claim 1, wherein said voltage divider means is a series resistive voltage divider means comprising a first resistor, a second resistor and a third resistor arranged in series in sequence, said first voltage dividing node being arranged between said first resistor and said second resistor, said second voltage dividing node being arranged between said second resistor and said third resistor; the other end of the first resistor is connected with the direct current input power supply, and the other end of the third resistor is grounded.
6. The circuit for underwater power supply protection and current detection as claimed in claim 1, further comprising a fourth resistor and a sixth capacitor, wherein one end of the fourth resistor is connected to a power limit setting pin of the protection chip, and the other end is grounded; one end of the sixth capacitor is connected with the time sequence capacitor pin of the protection chip, the other end of the sixth capacitor is grounded, and the ground pin of the protection chip is grounded.
7. The circuit for underwater power supply protection and current detection as claimed in claim 1, further comprising a third capacitor and a fifth resistor, wherein one end of said third capacitor (C3) is connected to the positive voltage input pin of said protection chip, and the other end is grounded; and two ends of the fifth resistor are respectively connected with a power normal indication signal pin and an output feedback pin of the protection chip.
8. The circuit for underwater power supply protection and current detection as claimed in claim 1, wherein the high potential input pin and the low potential input pin of the instrumentation amplifier chip are connected to the sampling resistor through an input filter network, the input filter network including a seventh capacitor, a tenth resistor and an eleventh resistor; two ends of the seventh capacitor are respectively connected with a high potential input pin and a low potential input pin of the instrumentation amplifier chip; one end of the tenth resistor is connected with a low-potential input pin of the instrumentation amplifier chip, and the other end of the tenth resistor is connected with one low-potential end of the sampling resistor; one end of the eleventh resistor is connected with a high potential input pin of the instrumentation amplifier chip, and the other end of the eleventh resistor is connected with one high potential end of the sampling resistor.
9. The circuit for underwater power supply protection and current sensing as recited in claim 1 wherein the first reference voltage input pin and the second reference voltage input pin of the instrumentation amplifier chip are both connected to an input reference voltage; the grounding pin of the instrumentation amplifier chip is grounded; an eighth capacitor is arranged between the grounding pin and the second reference voltage input pin; and a voltage output pin of the instrumentation amplifier chip and an AD (analog-to-digital) converter.
10. The circuit for underwater power supply protection and current detection according to any of claims 1-9, wherein said protection chip is an LM5069 chip; the instrumentation amplifier chip is an INA240A2D chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022031591.2U CN212367121U (en) | 2020-09-16 | 2020-09-16 | Circuit applied to underwater power supply protection and current detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022031591.2U CN212367121U (en) | 2020-09-16 | 2020-09-16 | Circuit applied to underwater power supply protection and current detection |
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| Publication Number | Publication Date |
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| CN212367121U true CN212367121U (en) | 2021-01-15 |
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| CN202022031591.2U Active CN212367121U (en) | 2020-09-16 | 2020-09-16 | Circuit applied to underwater power supply protection and current detection |
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