A water-cooling radiator includes a cooling module, a control circuit, a temperature sensor, and a display. The temperature sensor is used to sense an instant temperature of a heat generating device and output the instant temperature to the control circuit. The control circuit outputs a voltage for the cooling module corresponding to the instant temperature received from the temperature sensor. The control circuit compares the instant temperature with a preset temperature. When the instant temperature is higher than the preset temperature, the control circuit increases the voltage outputted to the cooling module to reduce the instant temperature of the heat generating device. When the instant temperature is lower than the preset temperature, the control circuit reduces the voltage outputted to the cooling module.

DETAILED DESCRIPTION

FIG. 1shows an embodiment of a water-cooling radiator of the present disclosure.

The water-cooling radiator10includes a cooling module101, a control circuit102, a temperature sensor103, and a display104. The cooling module101includes a pump201, a heat dissipation unit202, a water-cooling unit203, and a water tank204all connected end to end with pipes. The pump201and the heat dissipation unit202are connected to the control circuit102.

The pump201pumps water to flow in the pipes. The water-cooling unit203is made of metal and has an inside channel through which the water flows. The water-cooling unit203contacts a heat generating device108to absorb heat from the heat generating device108. The water flowing in the pipe takes heat in the water-cooling unit203away.

The heat dissipation unit202includes a plurality of fans401and a plurality of heat sinks402. The heat sinks402define a plurality of channels communicating with the inside channel of the water-cooling unit203. The water from the water-cooling unit203flows to the heat sinks402and carries heat to the heat sinks402. The fans401are set near the heat sinks402to dissipate heat for the heat sinks402, to reduce temperature of the water. The channels of the heat sinks402are also communicated with the water tank204through a pipe. The water is finally recycled to the water tank204.

The temperature sensor103is used to sense an instant temperature of the heat generating device108and output the instant temperature to the control circuit102.

The control circuit102outputs a duty ratio of a voltage for the cooling module101corresponding to the instant temperature received from the temperature sensor103. The control circuit102compares the instant temperature with a preset temperature stored in the control circuit102. When the instant temperature is higher than the preset temperature, the control circuit102increases the duty ratio of the voltage outputted to the pump201and fans401in the cooling module101to increase the speeds of the pump201and the fans401, thereby reducing the instant temperature of the heat generating device108. When the instant temperature is lower than the preset temperature, the control circuit102decreases the duty ratio of the voltage outputted to the pump201and fans401in the cooling module101to decrease the speeds of the pump201and the fans401, thereby reducing energy cost. When the instant temperature is equal to the preset temperature, the control circuit102maintains the duty ratio of the voltage outputted to the pump201and the fans401to keep the speeds of the pump201and the fans401, thereby keeping the instant temperature of the heat generating device108.

The display104is connected to the control circuit102to display the instant temperature of the heat generating device108and the preset temperature.

FIG. 2shows an embodiment of the control circuit102of the water-cooling radiator10.

The control circuit102includes an analog to digital (A/D) converter301, a single chip microcontroller (SCM)302, a button304, two metallic oxide semiconductor field effect transistors (MOSFETs)305and306, and a power source Vin.

Drains of the MOSFETs305and306are connected to the power source Vin. Gates of the MOSFETs305and306are connected to the SCM302to receive pulse control signals. A source of the MOSFET305is connected to the pump201. A source of the MOSFET306is connected to the fans401. In the embodiment, the MOSFETs are n-channel MOSFETs. When the SCM302outputs a high level signal, such as logic 1, the MOSFETs305and306are turned on, and the power source Vin supplies power for the pump201and the fans401. When the SCM302outputs a low level signal, such as logic 0, the MOSFETs305and306are turned off, and the power source Vin does not supply power for the pump201and the fans401. Because the SCM302outputs pulse control signals, the MOSFETs305and306are alternately turned on and off

The button304is used to set a value of the preset temperature. The temperature sensor103outputs an analog signal corresponding to the instant temperature to the A/D converter301, and the A/D converter301converts the analog signal to a digital signal and outputs the digital signal to the SCM302. The SCM302outputs the digital signal to the display104. The display104displays the value of the instant temperature. The SCM302compares the value of the instant temperature with the preset temperature and outputs control signals corresponding to results of the comparation. When the instant temperature is higher than the preset temperature, the SCM302increases a duty ratio of the pulse control signal to increase the time of the power source Vin supplying power for the pump201and the fans401in a cycle, thereby increasing the voltage outputted to the pump201and fans401. The higher the voltage of the pump201is, the faster the water flows. The higher the voltage of the fans401, the higher a rotation speed of the fans401. When the instant temperature is lower than the preset temperature, the SCM302decreases the duty ratio of the pulse control signal to reduce the time of the power source Vin supplying power for the pump201and the fans401in a cycle, thereby decreasing the voltage outputted to the pump201and fans401. When the instant temperature is equal to the preset temperature, the control circuit102keeps the value of the voltage outputted to the pump201and the fans401to keep the instant temperature of the heat generating device108.