Patent ID: 8238394

Claim:
A low power consumption pump driving circuit comprising: a laser cooling chip; a PMOS transistor; a NMOS transistor; a LC filter circuit; a laser; and a voltage sampling circuit; wherein a pulse width modulating signal generated by the laser cooling chip and a control terminal of the PMOS transistor are connected to the gate of the PMOS transistor; the source of the PMOS transistor is connected to a power supply; the drain of the PMOS transistor is connected to the LC filter circuit; the cathode of the laser is connected to the drain of the NMOS transistor; the source of the NMOS transistor is connected to the ground; and a NMOS control terminal of the laser cooling chip is connected to the gate of the NMOS transistor; wherein the pump driving circuit further comprises a high power small resistance resistor, the other terminal of the LC filter circuit is connected to a high power small resistance resistor, the other terminal of the high power small resistance resistor is connected to the anode of the laser, the voltage sampling circuit provides the voltage on the high power small resistance resistor to the laser cooling chip, and forms feedback control with the laser driving current setting circuit of the laser; the pump driving circuit further comprises a maximum laser driving voltage setting circuit and a laser driving current setting circuit connected with the laser cooling circuit, wherein the maximum laser driving voltage setting circuit is configured to set a maximum voltage that can be present at the two terminals of the laser and the laser driving current setting circuit is configured to set the DC driving current for the laser; the maximum laser driving voltage setting circuit is a potentiometer divider circuit, a digital potentiometer divider circuit, a voltage divider circuit that includes a resistance voltage divider network, or a DAC (digital to analog converter) circuit; the laser driving current setting circuit is a potentiometer divider circuit, a digital potentiometer divider circuit, a voltage divider circuit that includes a resistance voltage divider network, or a DAC (digital to analog converter) circuit.