47 results about "Floating ground" patented technology

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 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 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.

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 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 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.

The utility model provides a kind of leaded equipment display screen static treatment device, leaded equipment display screen, wherein, leaded equipment display screen static treatment device, including static receiver, discharge device, static voltage divider, controller and state indicator;Static receiver, leaded equipment display screen is connected, for collecting static that leaded equipment display screen surface generates;Discharge device is connected with static receiver, for discharging static that static receiver collects;Static voltage divider is connected with static receiver, for the static voltage divider output voltage division signal to static that static receiver collects is handled;Controller is connected with static voltage divider, for receiving voltage division signal, and according to voltage division signal output static intensity signal;State indicator is connected with controller, for receiving static intensity signal, and according to the static intensity signal received to indicate static intensity.The utility model effectively prevents the deadlocking or the phenomenon of garbled screen caused by static interference of leaded equipment display screen.

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.

The invention discloses a high-speed Miller platform detection circuit for a GaN half-bridge gate driving chip, and relates to the technical field of power device driving. The circuit comprises a detection node, an RC series circuit, a positive pulse discharge path, a negative pulse voltage stabilization path and a signal isolation circuit. The RC series circuit couples the voltage jump delay of the floating ground to the detection node so as to generate a voltage pulse representing the starting point of the Miller platform; the positive pulse discharge module and the negative pulse clamping module are respectively connected in parallel between the detection node and the floating ground, and are used for rapidly discharging positive interference pulses and clamping negative pulses at safe voltage; and the signal isolation module is used for isolating a post-stage circuit load. The circuit is simple in structure, high in response speed and easy to integrate, the problems that a traditional detection scheme is large in delay and complex in circuit are solved, and key support is provided for a high-frequency GaN driving chip to achieve accurate active driving.

An integrated circuit includes a floating rail voltage generator configured to receive a supply voltage and ground and to generate a non-linear floating supply voltage and a non-linear floating ground voltage based on a range selection signal. The integrated circuit includes a range selection generator that generates the range selection signal based on a comparison between the supply voltage and a threshold voltage.

The embodiment of the present application discloses a dead time control circuit and method. In a specific embodiment, the circuit comprises a feedback circuit for generating a first enable signal and a second enable signal when a modulation signal is high; wherein the first enable signal is low for controlling the lower tube to be closed; a floating ground circuit for outputting an upper tube gate control signal when the second enable signal is high; and an upper tube gate potential detection circuit for opening the upper tube when the upper tube gate control signal is low. The embodiment automatically adjusts the discharge delay time without any manual setting intervention, ensures that the upper and lower tubes are not connected, and the discharge delay is as small as possible, thereby preventing large peak current from burning the power tube and chip, ensuring the performance of the chip while improving the reliability of the chip.

The application provides an envelope tracking method and device, the method obtains a target envelope tracking input current signal through a boost circuit, and transmits the target envelope tracking input current signal to an amplification circuit through the boost circuit; the amplification circuit comprises an operational amplifier and a feedback network, and the operational amplifier works in a floating ground mode; the amplification circuit performs closed-loop conversion amplification on the target envelope tracking input current signal, and outputs an envelope tracking output voltage; the application also provides an envelope tracking device, and solves the problem that in the prior art, when the envelope tracking output voltage amplitude is high and the swing is large, the operational amplifier has high loss and low efficiency in the linear amplification process, so that the target envelope tracking input current signal is converted and amplified more efficiently, the conversion efficiency of the operational amplifier is improved, the amplification loss is reduced, and the user experience is improved.

The invention discloses a floating power domain circuit. The circuit comprises an anti-impact output unit, a first voltage correlation unit, a second voltage correlation unit and a bias power supply unit, the anti-impact output unit comprises a common gate amplification structure and is used for receiving external high-voltage input and outputting the external high-voltage input to a floating power supply end, and the impact of external high-voltage input jump on the floating power supply end is inhibited through the common gate amplification structure; the first voltage association unit is electrically connected between the floating power supply end and an external reference voltage and is used for establishing a voltage corresponding relation that the floating power supply end is synchronously adjusted along with the external reference voltage; the second voltage correlation unit is electrically connected between the floating power supply end and the floating ground end and is used for establishing a voltage corresponding relation between the floating power supply end and the floating ground end, so that a voltage difference between the floating power supply end and the floating ground end is formed by overlapping threshold voltages or gate source voltages of at least two active devices; and the bias power supply unit is used for providing stable bias current for each unit.

The invention provides a display panel, a display module and electronic equipment. Relates to the technical field of electronic equipment. The display panel provided by the invention comprises a driving substrate, a plurality of pixel units and touch wires, each pixel unit comprises at least two sub-pixels, and the at least two sub-pixels comprise a first sub-pixel and a second color sub-pixel; the touch wires are arranged on the sides, away from the driving substrate, of the multiple pixel units, and the touch wires comprise first touch wires located between the first sub-pixels and the second sub-pixels; the display panel further comprises first floating metal wires, the first floating metal wires are arranged between the first touch wires and the first color sub-pixels, and the first floating metal wires are electrically isolated from the first touch wires. According to the display panel, the first floating metal wires are arranged, the light emitting brightness of the squint angle of the first sub-pixels is reduced, the color cast problem can be solved under the large angle of view after the first sub-pixels are mixed into white light, and the performance of the display panel is improved.

The invention relates to the technical field of electronic test and measurement, and discloses a cross-spectrum correlation-based semiconductor low-frequency noise measurement system, which comprises an electromagnetic shielding unit, and an adaptive bias unit, a calibration switching unit and a dual-channel signal amplification unit which are arranged in the electromagnetic shielding unit, the external power supply unit, the data acquisition unit and the main control processing unit are arranged. The adaptive bias unit is integrated with a floating drive shielding circuit to eliminate a cable parasitic capacitance effect; and the calibration switching unit is internally provided with a standard noise source to realize full-link in-situ gain calibration. The system adopts a physically isolated dual-channel amplification architecture, signals to be detected are injected into two channels at the same time, and rigid synchronous sampling is carried out through a data acquisition unit. And the main control processing unit performs cross-power spectral density calculation and statistical averaging on the two digital sequences. According to the method, the background noise in the amplifier can be effectively suppressed, the sensitivity limit of single-channel measurement is broken through, and the ultralow-frequency weak noise of the semiconductor device is accurately extracted.

The utility model provides a novel impulse grounding resistance tester, and relates to the technical field of high-voltage electrical test equipment. The tester comprises a portable box body, wherein a storage battery, a multi-stage boosting module, an optical fiber communication module and a measurement and control terminal are integrated in the portable box body. The storage battery supplies power to the multi-stage boosting module, and the multi-stage boosting module injects impact current into the tested grounding device through a wire. And the optical fiber communication module is connected with the multi-stage boosting module and the measurement and control terminal to realize signal isolation transmission. The measurement and control terminal is integrated on the outer side of the box body and used for controlling starting and stopping of the multi-stage boosting module and receiving test data. The casing of the box body and the internal components are isolated from the external environment through insulating materials to form a floating structure, so that the test is safe and accurate. The tester solves the technical problems of large size and poor safety of impact grounding resistance testing equipment in an outdoor scene, so that outdoor safe, portable and efficient impact grounding resistance measurement is realized.

The invention provides an electrochemical-mass spectrometry device based on an integrated electrode plate, and relates to the technical field of analytical chemistry, the device comprises a mass spectrometer and an electrochemical reaction device, the mass spectrometer is provided with a sample inlet, and the electrochemical reaction device comprises an electrochemical workstation and an electrochemical reaction platform; the electrochemical reaction platform is a patterned electrode assembly and comprises an insulating base material with at least one hydrophilic sharp corner and three electrodes which are located in the hydrophilic sharp corner area and are electrically isolated from one another; the three electrodes are a working electrode, a counter electrode and a reference electrode, the working electrode is arranged at the tip of the hydrophilic sharp corner, and the tip of the hydrophilic sharp corner is arranged opposite to the sample inlet; the floating work station is connected with the patterned electrode assembly. The device provided by the invention can realize the combination of electrochemistry, electrospray and mass spectrum devices, is simple and convenient to operate, and can improve the electrochemical detection efficiency and detection accuracy.

This invention discloses an AC constant current source circuit based on a floating ground connected load, comprising: an AC signal generation circuit, a power input filter circuit, a voltage-to-current conversion circuit, and a load floating ground circuit. A direct digital frequency synthesizer (DDS) chip is used to generate a frequency-adjustable AC signal, and the amplitude is adjustable by adjusting the amplification factor through a programmable differential amplifier. The filter circuit removes DC bias and high-frequency noise from the signal. An operational amplifier is used to build a voltage-to-current conversion circuit to achieve constant current. The output terminal adopts a symmetrical design to achieve a floating ground connection to the load, reducing common-mode interference from ground, improving the output impedance of the circuit, and enhancing the circuit's load-carrying capacity. This invention's voltage-controlled AC constant current source circuit is simple to implement, has stable output, and high current accuracy. Furthermore, the microprocessor allows for adjustment of the current amplitude and frequency, meeting the constant current source requirements under different slurry flotation conditions.

The invention relates to a floating voltage source circuit, a floating voltage source unit, a power management chip and electronic equipment. The floating voltage source circuit comprises an error amplifier, wherein a first input end of the error amplifier is used for accessing a reference voltage; the first end of the floating power circuit is connected with the output end of the error amplifier, and the second end of the floating power circuit is connected with the second input end of the error amplifier; the first end of the floating ground circuit is respectively connected with the output end of the error amplifier and the first end of the floating power supply circuit, and the second end of the floating ground circuit is respectively connected with the second end of the floating power supply circuit and the second input end of the error amplifier; the second end of the floating power supply circuit and the second end of the floating ground circuit are both used for providing floating voltage for a load; the reference voltage is used to clamp the floating voltage at a voltage value of the reference voltage. The driving circuit has the characteristics of low quiescent current loss, high driving capability and active self-regulation capability, and the current efficiency of the circuit and the design flexibility can be improved.

This invention relates to the field of multi-branch floating ground power supply technology, and discloses a pulse-injection method for dual-parameter detection and estimation of residual current and insulation resistance. The method includes: injecting a symmetrical positive and negative pulse with zero net charge between the power supply midpoint and the grounding terminal; simultaneously acquiring the differential current and midpoint voltage of each branch; symmetrically decomposing the pulses to separate the steady-state leakage current component and the transient return current component; using the time integral of the total return current component to invert the capacitance time constant, insulation time constant, and capacitance weight; then extracting the insulation charge to obtain the global insulation resistance; using the insulation time constant to weight the transient return current component of each branch to obtain the branch leakage current ratio, mapping the output branch insulation resistance and residual current; finally, continuously fusing steady-state and transient data by generating dynamic coefficients, and adaptively updating the injection duration for the next round. This invention eliminates ring network shunt interference and achieves accurate positioning and anti-interference assessment of the dual parameters.

The invention provides a hot-line work robot arc discharge transient current test system and method and a medium. The system comprises a high-voltage wire, wherein a high-voltage test module is connected with the high-voltage wire; the liftable insulating platform is arranged right below the high-voltage wire; the current measurement module is arranged on the liftable insulating platform and is isolated from the ground to form a floating ground measurement structure. According to the invention, the whole current measurement module is electrically isolated from the ground to form a floating ground measurement structure, so that the potential reference of the measurement system and the potential of a discharge point float synchronously, and the conduction interference path of a ground loop is fundamentally cut off; the current measurement module is configured to adopt a differential measurement mode to actively identify and counteract common-mode radiation interference components, so that the signal-to-noise ratio and the measurement precision of a signal in a strong electromagnetic disturbance environment are greatly improved; the floating ground technology and the differential technology are organically combined to form a complete anti-interference system aiming at conducted interference and radiated interference.

This application discloses a floating power domain circuit. The circuit includes: an impulse-resistant output unit, a first voltage correlation unit, a second voltage correlation unit, and a bias power supply unit. The impulse-resistant output unit includes a common-gate amplifier structure for receiving an external high-voltage input and outputting a floating power supply terminal, suppressing the impact of external high-voltage input jumps on the floating power supply terminal through the common-gate amplifier structure. The first voltage correlation unit is electrically connected between the floating power supply terminal and an external reference voltage, establishing a voltage correspondence between the floating power supply terminal and the external reference voltage. The second voltage correlation unit is electrically connected between the floating power supply terminal and a floating ground terminal, establishing a voltage correspondence between the floating power supply terminal and the floating ground terminal, such that the voltage difference between them is formed by the superposition of the threshold voltages or gate-source voltages of at least two active devices. The bias power supply unit provides a stable bias current to each unit.

This invention discloses an ultra-high voltage control circuit, a high voltage controller, and a compressor, including a low-voltage input module, a high-voltage input module, a compressor drive module, and a bus capacitor module. The compressor drive module is electrically connected to the low-voltage input module, the high-voltage input module, and the bus capacitor module. The low-voltage input module includes a low-voltage battery and an ECU controller. The high-voltage input module includes a high-voltage power supply and a pre-charging circuit. The compressor drive module includes an isolation converter, a communication module, a main control MCU, and a SiC drive unit, etc. The SiC drive unit drives a three-phase half-bridge circuit. The bus capacitor module is electrically connected to the high-voltage input module and the three-phase half-bridge circuit of the SiC drive unit. It adopts a parallel structure of thin-film capacitors. The topology of the SiC drive unit is a half-bridge circuit, a high-side isolated drive, and a low-side intelligent drive. Bootstrap power supply realizes high-side floating ground power supply. The circuit structure is simple, the layout is reasonable, the circuit complexity is reduced, and the layout space is saved.

The invention discloses a floating power supply generating circuit for a driving circuit. The floating power supply generating circuit comprises a current mirror module, a source following module, a direct current source module, a first resistor, a floating ground reference end, a floating power supply output end and a high-voltage protection module. The current mirror module receives and mirrors the reference current, so that the mirrored current flows through the first resistor and generates voltage drop. The direct current source module provides a reference current. The source following module is electrically connected to the first resistor, superposes the voltage drop on the first resistor and the voltage of the floating ground reference end, and then outputs the voltage. The high-voltage protection module is used for discharge and protection. The floating power supply output end changes along with the floating ground reference end, at least one of the resistance value of the first resistor, the reference current and the mirror image proportion of the current mirror module is adjusted, and the voltage of the floating power supply output end is adjusted. Accurate following and dynamic compensation of the floating ground potential by the output voltage are achieved, and it is guaranteed that the power tube obtains stable driving voltage all the time when the floating ground changes.

The invention belongs to the technical field of semiconductor measurement, and particularly relates to a semiconductor direct current parameter test system based on Raspberry Pi. The test system comprises a Raspberry Pi, a switching power supply module, a floating power supply module, a voltage detection module, a current electrical measurement module, an amplification circuit module, a mode and range selection module, a clamping and integrating circuit module, a push-pull amplification circuit module, a DAC and ADC module and a signal transmission port. All the modules are connected to the PCB; according to the invention, high-precision four-quadrant source measurement and automatic measuring range switching in a wide dynamic range can be realized, and the test efficiency is greatly improved; a multiplex circuit structure is adopted, and single-system voltage measuring current applying and current measuring voltage applying are achieved; independent power supply conversion is adopted, and large-range and low-noise driving of room electricity is achieved; the circuit structure is highly integrated and the cost is controllable; according to the invention, the stability and reliability of the system can be improved, the safety of the equipment and the to-be-tested piece is guaranteed, excellent robustness is shown, and the repeatability of a test result is ensured.