Charging apparatus

Abstract

Disclosed in the present invention is mainly a charging apparatus capable of adjusting an output voltage. The charging apparatus comprises a control circuit for receiving a charging instruction, the charging instruction comprising a target voltage value; a direct-current motor, the control circuit controlling a rotating speed of the direct-current motor according to the target voltage value; a generator coaxially arranged with the direct-current motor, the direct-current motor driving the generator to generate corresponding alternating-current power at the rotating speed; and an output circuit for converting the alternating-current power into direct-current power and transmitting an output voltage value associated with the direct-current power to the control circuit.

Description

Charging device Technical Field

[0001] The present invention relates to a charging device, and more particularly to a charging device capable of adjusting output voltage. Background Art

[0002] General charging devices have only a fixed output voltage, which limits their application range.

[0003] Summary of the Invention

[0004] The main object of the present invention is to provide a charging device with adjustable output voltage, comprising:

[0005] a control circuit receiving a charging instruction, wherein the charging instruction includes a target voltage value;

[0006] A DC motor, wherein the control circuit controls a rotational speed of the DC motor according to the target voltage value;

[0007] a generator, coaxially arranged with the DC motor, wherein the DC motor drives the generator at the rotational speed to generate a corresponding AC power;

[0008] An output circuit converts the AC power into DC power and generates an output voltage value related to the DC power, wherein the output circuit receives the target voltage value transmitted by the control circuit and compares the target voltage value with the output voltage value to generate a difference value, wherein the control circuit adjusts the rotational speed of the DC motor according to the difference value. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a schematic diagram of the structure of a charging device according to an embodiment of the present invention.

[0010] FIG. 2 is a schematic diagram of an output circuit structure according to an embodiment of the present invention.

[0011] FIG3 is a schematic diagram of the structure of a voltage regulator according to an embodiment of the present invention.

[0012] FIG4 is a schematic diagram of the architecture of a four-switch buck-boost converter according to an embodiment of the present invention.

[0013] Legend: <Present invention> 1 Control circuit 2 DC motor 3 Generator 4 Output circuit 5 Supercapacitor module 41 Rectifier 42 Filter 43 Voltage regulator 431 Four-switch buck-boost converter 432 Analog-to-digital converter 433 Comparator Q1, Q2, Q3, Q4 Transistor L Inductor DETAILED DESCRIPTION

[0014] Referring to Figure 1, according to one embodiment of the present invention, a charging device with adjustable output voltage includes a control circuit 1, a DC motor 2, a generator 3, and an output circuit 4. In one embodiment, the charging device includes a detachable supercapacitor module 5. In one embodiment, the power source of the charging device of the present invention may be mains electricity. In another embodiment, the power source of the charging device of the present invention may be a DC power supply.

[0015] In one embodiment, the DC motor 2 and generator 3 are coaxially arranged and rotate synchronously. The faster the DC motor 2 rotates, the higher the voltage output by the generator 3. In one embodiment, when charging the supercapacitor module 5, the control circuit 1 controls the DC motor 2 to drive the generator 3 at a corresponding speed based on a received charging instruction, including a target voltage. Through the output circuit 4, DC power at the target voltage is output, effectively charging the supercapacitor module 5 in a very short time, for example, within 30 seconds. After charging, the supercapacitor module 5 can be removed from the charging device and used as a portable power source for convenient travel.

[0016] In one embodiment, the rotor of DC motor 2 is slender to reduce its moment of inertia. The armature winding with a grooved core has a larger heat capacity and can withstand high currents. In one embodiment, the air gap between the magnetic poles and the armature of DC motor 2 is small, which can easily cause rotor sticking in areas of high magnetic flux. This requires the control voltage to be increased from zero to a certain value before the rotor can rotate. To reduce sticking, the armature core uses oblique slots, which also reduces noise during operation and ensures smoother rotation.

[0017] In one embodiment, the output voltage of the charging device can be adjusted within a specific voltage range, such as 3 to 12 volts, to accommodate the varying voltage specifications of various electronic products. In one embodiment, the charging device is designed to charge electronic products operating at 5 volts. After receiving a charging command, the control circuit 1 transmits a target voltage of 5 volts to the output circuit 4. Based on a built-in comparison table comparing generator speed and output voltage, and a comparison table comparing motor speed and input voltage, the corresponding input voltage drives the DC motor 2. The DC motor 2 drives the generator 3 at the corresponding speed. Generator 3 generates corresponding AC power for the output circuit 4, which converts it into DC power with the corresponding voltage. The output circuit 4 then compares the difference between the corresponding voltage and the target voltage and transmits the difference back to the control circuit 1, which then adjusts the speed of the DC motor 2 based on this difference. Since the control circuit 1 initially drives the DC motor 2 according to the target voltage, which in turn drives the generator 3, the corresponding voltage and the target voltage are already quite close. This cycle allows the output circuit 4 to charge the supercapacitor module 5 with a fairly stable output voltage of 5 volts.

[0018] Referring to Figure 2, according to one embodiment of the present invention, the output circuit 4 includes a rectifier 41, a filter 42, and a voltage regulator 43. The AC power generated by the generator 3 is converted to DC power by the rectifier 41. The filter 42 then smoothes the ripple in the DC power, and the voltage regulator 43 stabilizes the output voltage. The voltage regulator 43 also receives a target voltage command from the control circuit 1, compares the target voltage value in the command with its own output voltage, and transmits the difference between the two to the control circuit 1. The control circuit 1 uses this difference to adjust the speed of the DC motor 2.

[0019] Referring to Figure 3, according to one embodiment of the present invention, a voltage regulator 43 includes a four-switch buck-boost converter 431, an analog-to-digital converter 432, and a comparator 433. The buck-boost converter stabilizes the output voltage of the ripple-smoothed DC power, charging the supercapacitor module 5. The analog-to-digital converter 432 then reads the digital value of the output voltage. Comparator 433 receives a target voltage command from control circuit 1, compares the target voltage value in the command with the digital value of the output voltage, and transmits the difference between the two to control circuit 1. Control circuit 1 uses this difference to adjust the speed of DC motor 2.

[0020] 4 , according to one embodiment of the present invention, a four-switch buck-boost converter 431 includes four transistors Q1, Q2, Q3, and Q4 as switches, and an inductor L connected to the input and output terminals. In one embodiment, the input voltage V in and the output voltage V out The transistors Q3 and Q4 on the low side are continuously in the off state, and the transistors Q1 and Q2 on the high side are continuously in the on state. That is, the buck-boost converter 431 is in the pass-through mode, which can further smooth the ripple of the DC power with extremely high transmission efficiency and extremely small voltage drop.

Claims

1. A charging device, comprising: A control circuit that receives a charging instruction, wherein the charging instruction includes a target voltage value; A DC motor, wherein the control circuit controls a rotation speed of the DC motor according to the target voltage value; A generator coaxially arranged with the DC motor, wherein the DC motor drives the generator to generate a corresponding AC power at the rotation speed; An output circuit that converts the AC power into a DC power and generates an output voltage value related to the DC power, wherein the output circuit receives the target voltage value transmitted by the control circuit, and compares the target voltage value and the output voltage value to generate a difference value, wherein the control circuit adjusts the rotation speed of the DC motor according to the difference value.

2. The charging device according to claim 1, further comprising a supercapacitor module that receives the DC power for charging.

3. The charging device according to claim 1, wherein, The output circuit includes a four-switch buck-boost converter that generates the DC power.

4. The charging device according to claim 1, wherein The four-switch buck-boost converter is in a continuous conduction mode.

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