Patent ID: 9577526
Date: 2017-02-21
CPC Classifications: H02M

Claim:
1. A voltage adjusting apparatus comprising: a feedback module comprising a jumper, a first resistor, a second resistor, and a third resistor; a control module comprising a pulse width modulation (PWM) controller configured to output control signals, the PWM controller comprising a feedback terminal, an upper gate driving terminal, a lower gate driving terminal, and a phase terminal; a connection point being located between the feedback terminal and the first resistor; a switch module configured to receive the control signals, and output working voltages accordingly and being electrically coupled to the connection point via the second resistor; and a diode, a fourth resistor, and a second inductor; the connection point being further electrically coupled to a second terminal of the jumper via the third resistor; a first terminal of the jumper is idle; a third terminal of the jumper is electrically coupled to the switch module; wherein if the first terminal and the second terminal of the jumper are electrically coupled together, the third resistor is cut off from the feedback module by the jumper, the first resistor and the second resistor are electrically coupled in the feedback module, the switch module outputs a first working voltage accordingly; and wherein if the second terminal and the third terminal of the jumper are electrically coupled together, the first resistor, the second resistor, and the third resistor are all electrically coupled in the feedback module, the switch module outputs a second working voltage accordingly; the switch module comprises a first switch, a second switch, a first inductor, and a capacitor, each of the second switch and the first switch comprises a first terminal, a second terminal, and a third terminal; the upper gate driving terminal is electrically coupled to the first terminal of the first switch; the second terminal of the first switch is electrically coupled to the third terminal of the second switch; the third terminal of the first switch receives a first DC voltage; and the phase terminal is electrically coupled to the second terminal of the first switch; the lower gate driving terminal is electrically coupled to the first terminal of the second switch; the second terminal of the second switch is grounded; a connection point between the second terminal of the first switch and the third terminal of the second switch is electrically coupled to a first terminal of the first inductor; a second terminal of the first inductor is grounded via the capacitor; a connection point between the first inductor and the capacitor is electrically coupled to a connection point between the feedback terminal and the first resistor via the second resistor; and the connection point between the first inductor and the capacitor is electrically coupled to the third terminal of the jumper; the diode comprises a first anode, a second anode, and a cathode; the PWM controller further comprises a power terminal; the power terminal is electrically coupled to the cathode of the diode via a fifth resistor; the first anode of the diode receives the first DC voltage; and the second anode of the diode receives a second DC voltage; the upper gate driving terminal is electrically coupled to the first terminal of the first switch via the fourth resistor; and the third terminal of the first switch receives the first DC voltage via the second inductor.