Abstract: A system for testing a power supply unit includes a test sub-system and a test control sub-system connected to the test sub-system and the power supply unit. The test sub-system perform tests and record the results. The test control sub-system is capable of selecting test items to test the power supply unit and setting an execution sequence of the test items. The test items includes a standby test item for testing the power supply unit at a standby state, a normal test item for testing the power supply unit at a normal state, and an over temperature protection test item for testing the power supply unit at an over heated state. The test control sub-system is further capable of automatically switching the standby test item to the normal test item, and switching the normal test item to the over temperature protection test item.

Abstract: A system includes a switching power supply, an electric load connected to the switching power supply, a voltage regulation circuit, and a detect device. The voltage regulation circuit is connected to the electric load and configured to output a Pulse Width Modulation (PWM) signal to regulate a voltage supplied to the electric load. The detect device is connected to the switching power supply for detecting whether the switching power supply is powered off when a current flowing to the electric load exceeds a preset tolerance value.

Abstract: A linear voltage generating device for testing performance of a power supply includes a comparator circuit, an analog to digital (A/D) conversion circuit, and an amplifier circuit. The comparator circuit is configured for receiving a pulse width modulation (PWM) signal, and comparing the PWM signal with a reference voltage to output a filtered PWM signal. The A/D conversion circuit is configured for receiving the filtered PWM signal, and converting the filtered PWM signal to a linear digital signal. The amplifier circuit is configured for receiving the linear digital signal, and outputting an amplified linear digital signal to an electric load electrically coupled to the power supply.

Abstract: A weld current generating apparatus includes a voltage conversion circuit, a control circuit, and a charge/discharge circuit. The voltage conversion circuit receives an AC voltage from an AC voltage input terminal and converts the AC voltage to a DC voltage. The control circuit receives the DC voltage and outputs control signals. The charge/discharge circuit receives the DC voltage and is charged by the DC voltage or discharged according to the control signals. The charge/discharge circuit outputs a continuous weld current during discharging process.

Abstract: A system for testing DC power supply performance includes a control circuit electrically connected to the DC power supply, a test device, and a control device electrically connected to the test device. The control circuit includes a micro controller capable of outputting control signals, a switch control module, and a switch module. The switch control module receives the control signals and powers up according to the control signals. The switch module is electrically connected to the DC power supply input and output terminals respectively, under control of the switch control module. The test device is electrically connected to the switch module and is electrically connected with the DC power supply input and output terminals according to the control signals. The test device reads voltages at the DC power supply input and output terminals which are transmitted to the control device.

Abstract: A system for testing power supply performance includes a DC power supply, a test apparatus for testing the DC power supply, and a control circuit electrically coupled to the DC power supply and the test apparatus. The control circuit includes an A/D conversion circuit, and a voltage level conversion circuit. The A/D conversion circuit receives DC voltage signals from the power supply, and converts the received DC voltage signals to digital signals. The voltage level conversion circuit receives the digital signals, and converts the received digital signals to voltage level signals which can be identified by the test apparatus. The test apparatus receives the voltage level signals, and generates signal waveforms of the voltage signals according to the received voltage level signals.

Abstract: A system is used to measure a fan rotational speed. The system includes a main controller, a first socket coupled to the linear fan, a second socket connected to the main controller, and an optical fiber amplifier connected to the main controller. A PWM (pulse width module) fan is coupled to the second socket, the PWM fan sends a first rotational speed signal, which represent a rotation speed of the PWM fan, to the main controller via the second socket. The optical fiber amplifier is capable of radiating light on fan blades of the linear fan, and sensing light reflected by the fan blades to count a rotational speed of the linear fan, and generating a second rotational speed signal which represents a rotational speed of the linear fan. The optical fiber amplifier sends the second rotational speed signal to the main controller.

Abstract: A Light Emitting Diode (LED) driving circuit includes a power supply circuit, an LED circuit, and a switch control circuit. The power supply circuit includes an energy storage device and a switch component connected to the energy storage device. The energy storage device stores electric power when the switch component is switched on. The LED circuit is connected to the energy storage device. The switch control circuit is connected to the switch component, and is adapted to control the on/off states of the switch component, thereby adjusting a current flowing through the LED circuit.

Abstract: A system for testing a computer includes a single chip microcontroller (SCM), an environmental test chamber, and a control device connected to the SCM and the environmental test chamber. The SCM repeatedly switches the computer on and off and monitors the computer's response. The environmental test chamber accommodates the computer. The control device receives monitored data from the SCM and controls temperature and humidity in the environmental test chamber.

Abstract: A system for testing a motherboard performance includes a control device, a voltage processing circuit, a voltage regulating circuit and a voltage feedback circuit. The control device stores a plurality of predetermined voltage values and outputs control signals according to the plurality of predetermined voltage values. The voltage processing circuit receives the control signal and outputs a plurality of PWM signals according to the control signal. The voltage regulating circuit receives the plurality of PWM signal and outputs a plurality of DC voltage to a plurality of voltage input terminals of the motherboard. The voltage feedback circuit collects voltage signals at the plurality of voltage input terminals of the motherboard.

Abstract: A test apparatus for a thermal resistor includes a control device, a temperature processing circuit, a voltage regulating circuit and a temperature detecting circuit. The control device stores a plurality of predetermined voltage values and outputs control signals according to those predetermined values. The temperature processing circuit receives the control signals and outputs a pulse width modulation (PWM) signal according to the control signal. The voltage regulating circuit receives the PWM signal and outputs a first direct current (DC) voltage to heat the thermal resistor. The temperature detecting circuit detects temperature signals and current signals from the thermal resistor. The control device receives the temperature signals and current signals of the thermal resistor and generates a resistance-temperature graph of the thermal resistor.

Abstract: An alarm system for emitting an alarm includes a distance detecting circuit, a gate circuit, a voltage conversion circuit, a distance judging circuit and an alarm circuit. The distance detecting circuit receives a first signal, detects a distance between an object and the alarm system, outputs a second signal and a third signal according to the distance. The gate circuit receives the second signal and the third signal and outputs a voltage level signal. The voltage conversion circuit receives the voltage level signal and converts the voltage level signal into a DC voltage signal. The distance judging circuit receives the DC voltage signal and compares the DC voltage signal against a reference voltage signal to output a control signal if necessary. The alarm circuit receives the control signal and produces the alarm when the distance between the object and the alarm system is less than a threshold distance.

Abstract: A temperature control system includes a temperature control circuit having a plurality of predetermined temperature values, a switch control circuit and a heating control circuit. The temperature control circuit outputs control signals according to the plurality of predetermined temperature values. The switch control circuit turns on according to the control signals and outputs the DC voltage to the heating control circuit which begins to get hot. The temperature control circuit detects a temperature of the heating control circuit from time to time and turns off the switch control circuit when the temperature of the heating control circuit is equal to a selected predetermined temperature.

Abstract: A Universal Series Bus USB port detection and testing circuit, configured to detect the voltage output of a USB port of an electronic device, includes a voltage comparing circuit and an indicating circuit. The indicating circuit is connected to an output terminal of the voltage comparing circuit. The voltage comparing circuit compares the voltage output from the USB port against a reference voltage and output a signal whereby the indicating circuit indicates whether the voltage is within, or above, or below, the standard range.

Abstract: A charging circuit includes a DC (Direct Current) power source, a rechargeable battery, and a switch circuit. The DC power source includes positive and negative output terminals, and the switch circuit is connected to and located between the DC power source and the rechargeable battery. The switch circuit comprises an arrangement of transistors and other components which permits the connection of the battery in any manner, and the normal charging or recharging of the battery notwithstanding the polarity of the battery terminals.

Abstract: A phase sequence detecting apparatus for a three-phase alternating current (AC) power includes a signal converting module and a phase sequence indicating module comprising plural indicating lights. The phase sequence detecting apparatus further includes a control module. The signal converting module is configured to receive three phase power signals output from the three-phase AC power, configured to convert the three phase power signals and send the converted signals to the control module. The control module controls power-on sequence of the indicating lights according to signals output from the signal converting module.

Abstract: A power supply circuit includes a voltage regulating circuit, a control circuit, and a switch circuit. The voltage regulating circuit receives an AC voltage signal from a live wire output terminal and converts the AC voltage signal to a control signal. The control circuit receives the control signal and turns on or turns off an electronic connection from the AC voltage signal to the switch circuit according to the control signal. The switch circuit is configured to be powered on and output the AC voltage signal when the electronic connection from the AC voltage signal to the switch circuit is turned on.

Abstract: A testing system for testing a conversion efficiency of a power supply unit (PSU) includes a power meter, a plurality of switches, a multimeter, a microcontroller unit, and a data processing device. The power meter is utilized to measure an input power supplied to the power supply unit. The multimeter is utilized to measure an output power of PSU. The microcontroller unit is configured for automatically switching the plurality of switches for enabling the multimeter to measure the output power of power supply. The data processing device is utilized to read data measured from the power meter and the multimeter and calculate a conversion efficiency of the PSU.

Abstract: A fan testing system includes a control device testing a fan, and a micro controller outputs pulse control signals to the fan. The control device stores a number of normal rotational voltage and rotational current values under different rotational speeds. The fan adjusts its rotational speed according to the pulse control signals, and outputs rotational speed signals to the micro controller. The micro controller collects rotational voltage signals and rotational current signals of the fan under different rotational speeds, and determines rotational speeds, rotational voltages, and rotational currents of the fan. The control device compares the rotational speeds, rotational voltages and rotational currents from the micro controller with the number of normal rotational voltage and rotational current values, and outputs a test complete signal to the micro controller when the fan rotates under the plurality of normal rotational voltage and rotational current values.

Abstract: A battery capacity test apparatus for indicating capacity of a battery includes a voltage regulator module, a comparator module, and an indication module. The voltage regulator module is configured to receive a voltage signal from the battery, and output a plurality of decreased sub-voltages. The comparator module is configured to receive the plurality of decreased sub-voltages, and compare the plurality of decreased sub-voltages with a reference voltage to output control signals. The indication module is configured to receive the control signals, and indicate capacity of the battery according to the control signals.