109 results about "Floating ground" patented technology

The invention provides a packaging structure of a three-phase power module, an inverter circuit and a motor driving system, which comprises low-side power supply ends and high-side floating power supply ends of three half-bridge driving chips, driving signal input ends of the three half-bridge driving chips are connected with corresponding pins, and driving signal output ends of the three half-bridge driving chips are connected with grid electrodes of corresponding half-bridge topological structures; the high-side floating ground end is connected with the output end of the corresponding half-bridge topological structure; the grounding end of each chip is connected with a common ground pin; the temperature sensing output end of the first chip and / or the temperature sensing output end of the second chip and the fault signal output end of the third chip are connected with the corresponding pins, and the overcurrent detection end of the third chip is connected with the negative end of the corresponding half-bridge topological structure. The positive end of each half-bridge topological structure is connected with a direct-current positive end pin, and the negative end and the output end of each half-bridge topological structure are connected with corresponding pins; the anodes of the three bootstrap diodes are connected with the corresponding low-side power supply ends, and the cathodes are connected with the corresponding high-side floating power supply ends. According to the invention, the chip can have more functions under the condition of keeping the packaging form unchanged, and the product application is expanded.

The invention discloses an online floating electrochemical scanning and electrospray ionization mass spectrometry combined device, relates to the technical field of analytical chemistry, and can improve the electrochemical detection efficiency and detection accuracy. According to the device, a three-electrode probe is arranged in a reaction cavity and is used for containing a target solution to be detected; the floating type electrochemical controller comprises a high-voltage module, a power supply module, a floating electrochemical measurement and control circuit and a three-electrode probe, the high-voltage module raises the first potential of the floating ground end of the power supply module into a second potential; the power supply module is used for converting the voltage of the floating battery into a preset voltage and then supplying power to the floating electrochemical measurement and control circuit; the floating electrochemical measurement and control circuit is used for controlling the three-electrode probe to output a continuous high-voltage signal or a continuous current signal, the continuous high-voltage signal or the continuous current signal acts on a target solution to generate an electrochemical reaction and directly generate spray ions, and the three-electrode probe is used for detecting voltage and current in the electrochemical reaction process of the target solution; and detection voltage and detection current are obtained.

According to an embodiment, a converter includes a bootstrap capacitor, a high-side switch, a low-side switch, an auxiliary switch, and a controller. The bootstrap capacitor has a first terminal coupled to a floating ground node. The high-side switch has a source terminal coupled to the bootstrap capacitor through the floating ground node. The auxiliary switch has a drain terminal coupled to the bootstrap capacitor through the floating ground node. The controller provides a first control signal to a control terminal of the high-side switch, provides a second control signal to a control terminal of the low-side switch, and provides a third control signal to a control terminal of the auxiliary switch. The third control signal is based on a condition associated with the converter after the first control signal and the second control signal deactivate the high-side switch and the low-side switch respectively.

According to the intelligent operation and maintenance and health monitoring system for the water conservancy and hydropower radial gate, a physical quantity detection module, a data acquisition and processing module, a gate opening and closing control module, a data transmission module, an interface display module and a system management module of the monitoring system are constructed; on-line monitoring parameters of the system are established and analyzed, and the control requirements of the hoist are determined to be opening control and synchronous control; a distributed system overall structure and a communication mode combining an Ethernet bus and optical fiber communication are established; a hardware structure of a monitoring system is constructed, and anti-interference measures of a twisted-pair shielding cable, a filter circuit, single-point grounding, floating ground shielding and a UPS power supply are adopted; a software structure of the monitoring system is constructed, and detailed analysis and program design are carried out on each functional module of software. The system can accurately monitor various state parameters such as stress strain and vibration when the radial gate operates, intelligent operation and maintenance of the radial gate and long-term stable detection of the health state are achieved, and safe and efficient operation of the hydraulic and hydroelectric gate is promoted.

The invention provides a direct-current floating ground system, a fault detection method and device, a medium and a program product. The direct-current floating ground system comprises a direct-current power supply which is not grounded; the load is electrically connected with the direct-current power supply; the first module is used for acquiring a first electrical parameter of a load and transmitting the first electrical parameter to the second module; the second module is used for acquiring a second electrical parameter of the direct-current power supply and determining whether the direct-current floating ground system breaks down or not according to the second electrical parameter and the first electrical parameter; wherein the second module and the first module are connected to form a common reference plane, the level of the reference plane is not equal to the grounding level, and the first electrical parameter and the second electrical parameter are both electrical parameters based on the reference plane.

According to an embodiment, a converter is provided. The converter includes a bootstrap capacitor having a first terminal coupled to a floating ground node; a high-side switch, a source terminal of the high-side switch coupled to the bootstrap capacitor through the floating ground node; a low-side switch; and a controller. The controller is configured to provide a first control signal to a control terminal of the high-side switch, and a second control signal to a control terminal of the low-side switch, wherein a transitioning of the second control signal to turn OFF the low-side switch is delayed after a duration from a transitioning of the first control signal to turn OFF the high-side switch, wherein the delay is automatically adjusted by detecting a condition associated with the converter, wherein the delay begins in response to a voltage at the floating ground node being less than zero.

The invention provides a driving circuit of a chopping switch circuit and electronic equipment, the driving circuit of the chopping switch circuit comprises a floating power supply generation circuit and a level shift circuit which are electrically connected with the chopping switch circuit, and the driving circuit provides port voltage bias for the chopping switch circuit through the floating power supply generation circuit. The floating power supply and the floating ground change along with the common-mode change of an input signal, so that the conduction impedance change and the threshold voltage change caused by the common-mode level change can be reduced; meanwhile, a power supply and a reference ground are provided for the level shift circuit, so that the level shift circuit can convert an originally constant high-amplitude clock signal into a clock signal changing along with the input common-mode level, and the amplitude of the clock signal can be kept at a constant and low value; therefore, low noise injection and clock feed-through can be realized under the condition that the conduction impedance and the threshold voltage are relatively stable, so that the precision and the stability of the circuit are improved, and the signal quality is improved.

The utility model relates to a MOS tube circuit, especially a kind of wide voltage input protection circuit for the voltage lifting of MOS tube, comprising: power input end, for receiving input voltage in wide voltage range;Filtering capacitor C1 is connected with the power input end;Floating ground circuit, including voltage stabilizing diode D1 and voltage dividing resistor R1, the cathode of voltage stabilizing diode D1 is connected with the power input end, the anode of voltage stabilizing diode D1 is connected with filtering capacitor C1 and voltage dividing resistor R1, the anode of voltage stabilizing diode D1 is as floating ground GND_D, voltage dividing resistor R1 is connected with base circuit GND, to make the anode of voltage stabilizing diode as the reference ground of PMOS tube gate control signal.The utility model provides a kind of wide voltage input protection circuit for the voltage lifting of MOS tube through floating ground circuit, significantly improves MOS tube circuit power adaptability and operating reliability.

The utility model belongs to the technical field of electronic circuits, and discloses a simple circuit capable of generating negative precision voltage reference and resisting high temperature of 200 DEG C. The simple circuit comprises a positive reference voltage source U1, a capacitor C1 and an operational amplifier U2, the output end of the positive reference voltage source U1 is connected to the inverted input end of the operational amplifier U2 through the isolation resistor R, the input end of the positive reference voltage source U1 is connected to a VCC power supply, and the GND pin of the positive reference voltage source U1 is connected to the output end of the operational amplifier U2; a pin 3 of the positive reference voltage source U1 is connected to a VCC power supply; a pin 3 of the positive input end of the operational amplifier U2 is grounded, and a pin 2 of the operational amplifier U2 is connected with a negative power supply; the two ends of the capacitor C1 are connected with the floating ground end of the positive reference voltage source U1 and the output end of the positive reference voltage source U1. According to the utility model, fewer components are used, and the precision is higher; the circuit has flexibility, and different negative precision voltage references can be generated by selecting different reference voltage sources and amplifier combinations; and the negative voltage reference generated by the module at the high temperature of 200 DEG C still has very good temperature stability.

The utility model discloses a lead to the inductive control system of lead of lamp, including voltage input, voltage stabilizing circuit and singlechip U3 voltage input 12V voltage from the end of LED module, voltage stabilizing circuit includes voltage stabilizing chip U1, voltage stabilizing chip HT7550, U1 is used to power supply to singlechip U3, and sensor includes photoelectric coupler infrared transmitting tube U2A and photoelectric coupler infrared receiving tube U2B, photoelectric coupler U2A connects to the 3rd pin of singlechip U3, and photoelectric coupler U2B connects to the fourth pin of singlechip U3, and when the singlechip U3 detects that photoelectric coupler U2A and photoelectric coupler U2B are high level or low level, corresponding, the 5th pin output high level or low level of singlechip U3 and output to voltage output end. Without independent power line, can be directly connected in series in the loop of load: especially suitable for the intelligent transformation to the existing lighting circuit, increases the function such as inductive control under the condition of not changing the original wiring.

This utility model discloses a solar-powered lamp, including a PCB board, a control management module, a battery management module, and an optocoupler isolation module. Multiple sets of LED beads are integrated at the top of the PCB board. The control management module and the battery management module are also integrated at the top of the PCB board, with their communication terminals coupled to the control management module. The optocoupler isolation module is also integrated at the top of the PCB board, with its communication terminal coupled to the telecommunication input terminal of the control management module. This utility model utilizes the optocoupler isolation module and its photoelectric transmission characteristics to transmit voltage changes from the photovoltaic panel to the microcontroller. The voltage changes are used to determine whether it is day or night. This avoids the inconsistency between the photovoltaic panel's ground wire and the battery's ground wire under high current conditions, thus preventing interference and misjudgment. This floating ground technology ensures a stable power supply to the microcontroller from the photovoltaic panel and battery.

An electrostatic protection structure comprises: a plurality of voltage domain circuits, each of the voltage domain circuits at least comprising a ground level bus; a conduction circuit connecting the ground level buses of adjacent voltage domain circuits, the conduction circuit at least comprising a control end, the control end being used to control the conduction circuit to establish a path between the adjacent ground level buses when a potential difference between the adjacent ground level buses is detected, thereby being able to timely reduce the potential difference on the ground level buses, avoiding failure of the clamping circuit or excessive reaction time caused by excessive potential of the floating ground level bus, thereby improving the protection performance of the electrostatic protection structure.

The invention provides an on-chip integrated charge pump circuit and a boost chip suitable for automotive electronics. The charge pump circuit comprises a floating potential generation module, a level conversion module and a two-stage charge pump module, the floating potential generation module is used for sampling the voltage difference between the input voltage and the output voltage fed back by the two-stage charge pump module, comparing the voltage difference with a preset reference value, and adjusting the output floating potential, so that the voltage difference between the output voltage and the input voltage reaches the preset reference value; the level conversion module is used for converting a clock input signal of a low-voltage domain to a dynamic high-voltage domain suitable for the two-stage charge pump module and outputting the clock input signal to the two-stage charge pump module; and the two-stage charge pump module charges and discharges a floating capacitor in the two-stage charge pump module according to the input voltage, the floating potential and the output signal of the level conversion module, so that the output voltage of the two-stage charge pump module is greater than the sum of the input voltage and the power supply voltage of the internal control circuit.

The application discloses a floating ground voltage generating circuit, which comprises a power supply end, a bias circuit, an operational amplifier circuit, a fast response circuit and an output circuit, the bias circuit provides bias voltage and bias current for the operational amplifier circuit and the fast response circuit respectively, the bias circuit provides reference voltage for the operational amplifier circuit, and the fast response circuit is used for quickly adjusting the change of output voltage of the output circuit, so that the stable floating ground voltage is obtained. The application can effectively solve the problem of large deviation of the output floating ground voltage and improve the performance of the driving circuit.

The invention relates to the technical field of intelligent power driving in analog integrated circuits, in particular to a novel intelligent power driving chip high-side continuous power supply circuit which comprises a novel charge pump bootstrap power supply circuit and a charge pump capacitor Ccharge. According to the novel charge pump bootstrap power supply circuit, an oscillator is integrated at the control end of a voltage withstanding switch S2A, a clock signal CLK is generated through the oscillator to control on and off of the voltage withstanding switch S2A, meanwhile, the dV / dt state of a floating ground end HS of a charge pump circuit is detected, a dV / dt detection adaptive circuit is matched to generate a control signal of a voltage withstanding switch S1A, and the voltage withstanding switch S2A is controlled to be switched on and off. A high-side continuous power supply circuit is formed by combining charge pump diodes D1 and D2 and a charge pump capacitor Ccharge and continuously supplies power to a bootstrap capacitor Cboot; according to the novel charge pump bootstrap power supply circuit, a high-side integrated level shift circuit in the novel charge pump bootstrap power supply circuit is effectively prevented from working in a high-frequency state, and the dynamic power consumption of the circuit is remarkably reduced while the relatively high power supply efficiency is maintained.

The invention discloses a high-precision wide-range current detection circuit which comprises an auxiliary operational amplifier A1, a power tube MP, a sampling tube MS, a PMOS tube PM1, a resistor RS, an operational amplifier OP, a charge pump, a driving module and a high-voltage domain floating ground module. An auxiliary operational amplifier A1 is adopted to forcibly balance source electrode potentials of a sampling tube MS and a power tube MP, source electrode voltage of the power tube MP is sampled and fed back to an operational amplifier OP, an output signal of the operational amplifier OP is transmitted to a driving module, power supply of the driving module is provided by a charge pump and a high-voltage domain floating ground module, and the driving module dynamically adjusts grid electrode voltage of the power tube MP. According to the invention, the mismatch of the operational amplifier input end is reduced, and the current detection proportion precision is kept within the maximum-to-minimum range of the load current.

The invention discloses a floating ground generation circuit in high-voltage application and a control method thereof, and the floating ground generation circuit comprises a coarse tuning ground generation circuit, a reference voltage circuit, a feedback resistance network, a low-voltage error amplifier EA, an adjusting tube NM1 and a current self-adaptive adjusting circuit, the coarse tuning ground generation circuit generates a voltage HVSS based on a power supply voltage VDD; the reference voltage circuit generates a reference voltage VREF based on a power supply voltage VDD and a voltage HVSS, a normal-phase input end of the low-voltage error amplifier EA is connected with the reference voltage VREF, an inverted-phase input end of the low-voltage error amplifier EA is connected with an output end of the feedback resistance network, an output end of the error amplifier EA is connected with a grid electrode of the adjusting tube NM1 and an input end of the current self-adaptive adjusting circuit, and the current self-adaptive adjusting circuit is connected with the grid electrode of the adjusting tube NM1. And the output end of the current self-adaptive regulation circuit generates an output voltage VOUT. The floating ground generation circuit provided by the invention simultaneously meets the design requirements of small area and low power consumption.

This application discloses an online floating-ground electrochemical scanning electrospray mass spectrometry (FSMS) device, relating to the field of analytical chemistry, which can improve the efficiency and accuracy of electrochemical detection. The device includes: a reaction chamber with a three-electrode probe for holding the target solution to be detected; a floating-ground electrochemical controller, including: a high-voltage module, a power supply module, a floating-ground electrochemical measurement and control circuit, and the three-electrode probe; the high-voltage module raises the first potential of the floating terminal of the power supply module to a second potential; the power supply module converts the voltage of the floating battery into a preset voltage to power the floating-ground electrochemical measurement and control circuit; the floating-ground electrochemical measurement and control circuit controls the output of a continuous high-voltage signal or a continuous current signal from the three-electrode probe, which acts on the target solution to generate an electrochemical reaction and directly produce spray ions; the voltage and current during the electrochemical reaction of the target solution are detected using the three-electrode probe to obtain the detection voltage and detection current.

The invention discloses a direct-current high-voltage transient method, circuit and device, and belongs to the field of direct-current high-voltage transients, and the method comprises the steps: controlling a first relay switch module to be switched to a real-time switching state based on a relay power signal; a lithium battery charging power supply signal is transmitted to the lithium battery module based on the first relay switch module and the second relay switch module; a test switch is controlled to be closed based on the charging state of the lithium battery module, and a relay power signal is input to a second relay switch module and a floating power switch module based on the test switch, so that the second relay switch module and the floating power switch module are switched to a real-time on-off state; a floating signal is output to the second relay switch module through the lithium battery module, so that the second relay switch module outputs the floating signal to the floating power supply switch module; the floating signal is output to the high-voltage electronic switch module through the floating power switch module, so that the high-voltage electronic switch module responds to the control signal, the target power signal is obtained and input to the target high-voltage equipment, and the reliability of direct-current high-voltage transient is improved.

The application provides an on-chip integrated charge pump circuit and a boost chip suitable for automobile electronics, wherein the charge pump circuit comprises a floating ground potential generation module, a level conversion module and a two-stage charge pump module; the floating ground potential generation module is used for sampling a voltage difference between an input voltage and an output voltage fed back by the two-stage charge pump module, comparing the voltage difference with a preset reference value, and adjusting an output floating ground potential so that the voltage difference between the output voltage and the input voltage reaches the preset reference value; the level conversion module is used for converting a clock input signal in a low voltage domain to a dynamic high voltage domain suitable for the two-stage charge pump module and outputting the clock input signal to the two-stage charge pump module; and the two-stage charge pump module charges and discharges a floating ground capacitor in the two-stage charge pump module according to the input voltage, the floating ground potential and an output signal of the level conversion module, so that the output voltage of the two-stage charge pump module is greater than the sum of the input voltage and a supply voltage of an internal control circuit.

This application provides an insulation monitoring method and equipment for a high-voltage power supply system, relating to the field of power system insulation monitoring technology. The high-voltage power supply system is equipped with a two-level isolation architecture, including a primary isolation architecture between the high-voltage circuit and a floating ground reference point, and a secondary isolation architecture between the floating ground reference point and the protective ground. The method includes: performing insulation monitoring between the high-voltage circuit and the floating ground reference point to obtain a first-level monitoring result; performing insulation monitoring between the floating ground reference point and the protective ground to obtain a second-level monitoring result; and generating corresponding insulation anomaly alarm information based on the first-level and second-level monitoring results. This application achieves automatic dynamic insulation monitoring of the high-voltage power supply system while miniaturizing and reducing the cost of the insulation monitoring equipment. It can not only detect insulation anomalies in a timely manner, but also more accurately determine the location of insulation anomalies through tiered monitoring, thereby improving fault handling efficiency and ensuring the safe and stable operation of the system.

A bridge type high-voltage drive circuit comprises an oscillator, an inverter INV0, capacitors C1 and C2, a high-side turn-on circuit, a high-side turn-off circuit and a low-side drive circuit; a high-side input signal HIN is connected to an input end of the oscillator and an input end of the high-side turn-off circuit; an output end of the oscillator is connected to an input end of the INV0 and one end of the C2; an output end of the INV0 is connected to one end of the C1; the other end of the C1 is connected to an inverting input end of the high-side turn-on circuit; the other end of the C2 is connected to a non-inverting input end of the high-side turn-on circuit; one output end of the high-side turn-on circuit drives a high-side power tube M1 and is connected to a gate turn-off port of the high-side turn-off circuit; the other output end of the high-side turn-on circuit is connected to a floating ground VS and is connected to a floating ground VS turn-off port of the high-side turn-off circuit; a low-side input signal LIN drives a low-side power tube M2 through the low-side drive circuit.

A floating reference generation circuit for a SMPS includes core biasing, driver logic, and transient biasing blocks. The core biasing block generates temperature and process-tracking reference voltages. The driver logic block uses these references to generate a floating reference voltage through level-shifting and output circuits, with compensation capacitors improving settling time and stability. The transient biasing block employs a diode-transistor cascade and feedback loops to control transitions between voltage levels while maintaining voltage stress limits. The circuit can be configured as either a floating ground generator or floating supply generator through polarity adaptation of the components. Coordination between floating ground and supply reference signals enables precise timing control of voltage transitions. The open-loop architecture enables stable high-speed operation across varying load and line conditions, while eliminating separate reference generation circuits. Implementation provides improved efficiency and noise isolation for analog components while reducing settling time and maintaining high-voltage tolerance.

The invention discloses a multi-channel device for rapidly measuring extra-small unit current. The multi-channel device is an integral multi-channel measuring device composed of a plurality of single-channel measuring modules. The single-channel measurement module comprises a gear switching module, a sampling module, an absolute value module, an ADC module, an MCU module and a human-computer interface module. The gear switching module is connected with a measured load. Positive and negative currents can be rapidly measured, and the current value can be extremely small. The main aspect of the device is characterized in that a floating ground technology and an absolute value circuit are adopted, other devices can rapidly realize filtering rectification, and a current value can be rapidly measured.

The utility model discloses a packaging structure for an Ethernet power supply control circuit and power receiving equipment. The packaging structure comprises a lead frame which comprises a base island and a plurality of pins; the switching power supply controller, the power switch tube and the powered equipment controller are placed on the base island; the plastic package body wraps the switching power supply controller, the power switch tube, the power receiving equipment controller and the base island, and the floating ground end of the switching power supply controller and the reference ground end of the power receiving equipment controller are connected to different pins. Therefore, the power switch tube, the power receiving equipment controller and the switching power supply controller required by Ethernet power supply are integrated into the same lead frame, the packaging size can be greatly reduced, the electrical path between electronic elements is shortened, and compared with a traditional discrete scheme, the Ethernet power supply integrated lead frame has great advantages in cost and performance.

The application relates to a power supply circuit, a driving device and a power conversion device. The power supply circuit comprises a first step-down conversion circuit, a secondary winding and a first bootstrap circuit; wherein the input end of the first step-down conversion circuit is used for connecting a direct-current power supply, the direct-current output end of the first step-down conversion circuit is connected with the input end of the first bootstrap circuit; the first bootstrap circuit is used for supplying power to the driving circuit corresponding to the floating ground switch tube in the first bridge arm circuit; the direct-current output end of the first step-down conversion circuit is also used for supplying power to the driving circuit corresponding to the ground switch tube in the first bridge arm circuit; the inductive element in the first step-down conversion circuit serves as the primary winding corresponding to the secondary winding, and the secondary winding is used for supplying power to the driving circuit corresponding to each switch tube in the alternating-current side conversion circuit in the power conversion circuit. The power conversion device with a smaller size can be realized by adopting the power supply circuit.

The application discloses a floating ground current output circuit and method for replacing a direct current voltage Hall sensor, and the floating ground current output circuit comprises an operational amplifier, a resistor and a triode; the floating ground current output circuit adopts the operational amplifier virtual short and operational amplifier virtual break principles, converts bidirectional direct current voltage into bidirectional direct current output through the resistor, and expands the current output through the triode. The floating ground current output circuit provided by the application can be combined with a conventional electromagnetic isolation sensor, a photoelectric isolation sensor and a modulation demodulation sensor circuit, can replace the floating ground current output mode of the direct current voltage Hall sensor, can convert bidirectional direct current voltage into bidirectional direct current output, and can control the detection precision within a 0.1% error range. Compared with the floating ground current conversion circuit of the direct current voltage Hall sensor itself, the floating ground current output circuit has the advantages of low temperature drift, high precision and small power consumption.

The present invention belongs to the technical field of electric field instruments, and specifically relates to a constant power supply device for a magnetospheric space electric field instrument, the device comprising an FPGA control circuit, a digital-to-analog converter, a summing amplifier circuit, a control circuit, a floating ground reference circuit, and a load driving circuit. The device realizes accurate current-to-voltage conversion through a DAC controlled by an FPGA, and realizes voltage output in positive and negative directions through a summing amplifier circuit. The floating ground reference circuit ensures that the output voltage is stable relative to the floating ground in space, and the load driving circuit outputs a stable voltage to the load. The device is simple to control and has strong adaptability. It realizes accurate control of power supply output through FPGA, can withstand changes in load impedance, ensures the stability of power supply output, realizes voltage output in positive and negative directions, and meets the needs of different loads.

The application discloses a series connection unit cascade circuit and a high-voltage cascade device, and relates to the field of circuit design.The series connection unit cascade circuit comprises a first series connection unit, a second series connection unit, a voltage dividing circuit, a floating ground and a floating resistor.The first series connection unit and the second series connection unit are connected in series to meet the high-voltage requirement of the high-voltage cascade device, and the power supply ends of the first series connection unit and the second series connection unit are connected with the floating ground through the voltage dividing circuit.The floating ground is connected with the ground through the floating resistor, so that the highest voltage between the devices in the first series connection unit and the second series connection unit and the floating ground at any time will not be greater than the voltage of the power supply for supplying power to the series connection unit, thereby solving the working voltage endurance problem of the devices in the series connection unit, and enabling the high-voltage cascade device to integrate more series connection units.

The present application provides a current comparison circuit, a control chip, and a master-slave system. The current comparison circuit comprises a voltage regulation circuit, a reference voltage circuit, and a comparison circuit. A current receiving terminal of the voltage regulation circuit receives a current to be measured, a floating ground terminal of the voltage regulation circuit generates a floating ground voltage, a voltage detection terminal of the voltage regulation circuit outputs a detected voltage related to the current to be measured, and the voltage regulation circuit is capable of regulating the floating ground voltage. The reference voltage circuit comprises at least two branches, and the comparison circuit comprises at least two comparators, wherein first input terminals of the two comparators are both connected to the voltage detection terminal, and second input terminals of the two comparators receive different reference voltages, thereby achieving two detected voltage measurements on the basis of transition results of the two comparators. In addition, a voltage domain of the voltage regulation circuit is arranged between a high-voltage power supply terminal and a low-voltage power supply terminal, and voltage domains of the reference voltage circuit and the comparison circuit are arranged between the high-voltage power supply terminal and the floating ground terminal, thereby enabling the comparators to operate in a low-voltage domain, and allowing for reduced chip area and increased comparison speed.