CN203761094U - Solar-energy wireless charger - Google Patents

Abstract

The utility model discloses a solar wireless charger, which is a lithium battery charger capable of utilizing solar energy and realizing wireless energy transmission. Module, power receiving rectification and voltage stabilization module, lithium battery charging management module consists of four modules. When the charger is turned off, the electric energy obtained by the photoelectric conversion of the solar cell is stored in the battery; when the charger is turned on, the battery is connected to the power management module through a double-pole double-throw switch, so as to stably supply power to the transmitter module, and then through high-frequency signal transmission, the energy It is transmitted to the power receiving module through inductive coupling, and the effective charging of the lithium battery is realized under the control of the charging management module. The utility model adopts inductively coupled wireless energy transmission, and the battery does not need to be connected with the power supply by a data line, and is convenient to use; the charging process of the battery is effectively controlled, and overcharging and reverse charging can be prevented.

Description

Solar Wireless Charger

technical field

The utility model relates to the field of inductively coupled wireless energy transmission, in particular to a wireless charging device that utilizes solar energy to supply power to lithium batteries.

Background technique

The popularity and development of mobile devices have put forward higher and higher requirements for the convenience of chargers. At the same time, the green nature of the consumption process of mobile devices has become more and more important to today's energy security.

Due to the different models of mobile devices, traditional mobile phone chargers have certain restrictions on the model and interface of the charger, so the convenience of use is greatly reduced. The mobile power supply also brings certain troubles because of the existence of the data line. On the other hand, the mobility of mobile power supplies requires the emergency function of energy. If there is no AC mains supply outdoors, the supply function of solar power will sometimes show greater appeal.

Utility model content

The purpose of the utility model is to overcome the problems existing in the current traditional mobile phone lithium battery charger, and propose a solar wireless charger, which uses solar energy as energy supply, transmits electric energy through high-frequency signals, and wirelessly charges lithium batteries efficiently and conveniently. .

The technical scheme that the utility model solves its technical problem adopts is:

A solar wireless charger, including a power transmitting base and a charging base, wherein the power transmitting base includes two parts: a power management module and a power transmitting module, and the charging base includes two parts: a power receiving, rectifying and stabilizing module and a lithium battery charging management module part;

The power management module includes a solar panel, a storage battery, a double-pole double-throw switch, a voltage-stabilizing output circuit, and the voltage-stabilizing output circuit outputs two-stage voltages; the positive and negative output interfaces of the solar panel are connected to one of the double-pole double-throw switches. On one side, the positive and negative input interfaces of the stabilized power supply circuit are connected to the other side of the double-pole double-throw switch, and the middle two interfaces of the double-pole double-throw switch are connected to the positive and negative poles of the battery;

The power transmission module includes a high-frequency square wave generating circuit, an operational amplifier buffer, a power amplifier part, a transmitting coil and a primary side compensation capacitor. The transmitting coil and the primary side compensation capacitor are connected in parallel to the circuit of the power amplifier part. The output is powered by the primary voltage; the output of the high-frequency square wave generating circuit is buffered by the op amp and connected to the power amplifier circuit, and is powered by the secondary voltage output by the regulated output circuit;

The power receiving, rectifying and stabilizing module includes a receiving coil, a secondary side compensation capacitor, and a rectifying and stabilizing circuit. The power in the transmitting coil of the power transmitting module is received by the receiving coil. The rectifying and stabilizing circuit mainly includes a rectifying bridge and a filter capacitor. and adjustable integrated voltage regulator chip; after the receiving coil and secondary side compensation capacitor are connected in parallel, they are connected to the lithium battery charging management module through the rectifier bridge, filter capacitor and adjustable integrated voltage regulator chip, and the lithium battery charging management module is controlled by the lithium battery charging management chip. Unified control.

The lithium battery charging management module includes a red indicator light and a green indicator light, indicating two states of charging and charging respectively. When the voltage drops, the lithium battery charging management chip enters sleep mode to prevent the lithium battery from being recharged.

Compared with the prior art, the utility model has the beneficial effects of:

1. Using solar energy as energy, more green and environmentally friendly;

2. Using inductively coupled wireless power transmission, the battery does not need to be connected to the power supply with a data cable, which is more convenient to use;

3. Effective control of the battery charging process can prevent overcharging and reverse charging.

Description of drawings

Fig. 1 is a structural schematic diagram of a solar wireless charger;

Figure 2 is a module connection diagram of a solar wireless charger;

Fig. 3 is a circuit diagram of a power management module of a solar wireless charger;

Fig. 4 is a circuit diagram of a power transmitting module of a solar wireless charger;

Fig. 5 is a circuit diagram of a power receiving, rectifying and stabilizing module of a solar wireless charger;

Fig. 6 is a circuit diagram of a lithium battery charging management module of a solar wireless charger;

In the figure: 1. Power transmitting base; 2. Solar panel; 3. Double pole double throw switch; 4. Charging induction area; 5. Charging base; 6. Lithium battery slot; 7. Red indicator light; 8. Green indicator light; 9. Battery; 10. Transmitting coil; 11. Primary side compensation capacitor; 12. Receiving coil; 13. Secondary side compensation capacitor; 14. Rectifier bridge; 15. Adjustable integrated voltage regulator chip; 16. Lithium battery Charge management chip.

Detailed ways

As shown in FIG. 1 , the present invention consists of an electric energy transmitting base 1 and a charging base 5 . As shown in Fig. 2, the present invention includes four major parts: a power management module, a power transmission module, a power receiving rectification and voltage stabilization module, and a lithium battery charging management module. The power transmitting base 1 includes two parts: a power management module and a power transmitting module, and the charging base 5 includes two parts: a power receiving, rectifying and stabilizing module and a lithium battery charging management module. in:

The power management module includes a solar panel 2, a storage battery 9, a double-pole double-throw switch 3, and a voltage-stabilizing output circuit. The solar panel 2 performs photoelectric conversion, the positive and negative output ports are respectively connected to the two interfaces on one side of the double-pole double-throw switch 3, and the positive and negative input ports of the voltage stabilization control circuit are connected to the two ports on the other side of the double-pole double-throw switch 3. The interfaces are connected, and the middle two interfaces of the double pole double throw switch 3 are connected with the positive and negative poles of the storage battery 9 . When the wireless charger is turned off, the double poles are thrown to one side of the solar battery panel 2, the battery 9 is connected to the solar battery panel 2, and the battery 9 is charged. Turn on the wireless charger, throw the two poles to the side of the voltage-stabilizing power supply circuit, and the storage battery 9 provides electric energy for the voltage-stabilizing power supply circuit. The voltage output from the storage battery 9 passes through the voltage stabilizing chip LM7812 to output a stable primary voltage, and after capacitor filtering, it passes through the voltage stabilizing chip LM7805 to output a stable secondary voltage. The two-level voltage provides power for the post-stage transmitting module.

Under the power supply of the secondary voltage, the NE555 chip and the resistor and capacitor in the transmitter module form an RC oscillator circuit, which generates a high-frequency square wave with a constant duty cycle. After the square wave is buffered by the high-frequency operational amplifier chip OPA604, it drives the field effect MOS tube and controls the on and off of the tube. The transmitting coil 10 is a ring coil made of enameled wire, connected in parallel with the primary side compensation capacitor 11, and connected with the primary power supply voltage. A high-frequency transmit pulse signal is formed in the transmit coil 10 .

The electric energy receiving rectifying voltage stabilizing module circuit is shown in FIG. 5 , including a receiving coil 12 , a secondary side compensation capacitor 13 , and a rectifying voltage stabilizing circuit. The receiving coil 12 is also a ring coil made of enameled wire, and is connected in parallel with the secondary compensation capacitor 13 . The resonance frequency in the receiving coil 12 coincides with the resonance frequency of the transmitting coil 10 . The electric energy is transmitted to the receiving coil 12 through a high-frequency signal, and converted into a stable direct current through a rectifying and stabilizing circuit. The rectifier bridge 14 is composed of four fast recovery diodes, which can efficiently rectify the alternating current into direct current. After passing through the filter capacitor, the adjustable integrated voltage regulator chip 15 LM317 outputs a stable charging voltage, which is used for charging management of the subsequent lithium battery. The modules provide electrical power.

The lithium battery charge management circuit is shown in Figure 6. Under the control of the lithium battery charging management chip 16 bq2057, the lithium battery is pre-charged, constant-current charged, and constant-voltage charged. At this stage, the battery is not saturated, and the red indicator light 7 will light up. Charging is completed, and the green indicator light 8 is lighted. If the input voltage is unstable and drops, the lithium battery charging management chip 16 will enter a dormant state, which effectively prevents the lithium battery from being recharged.

When in use, the lithium battery is placed on the charging base 5, and the lithium battery is connected with the charging management module. Place the charging base 5 on the charging induction area 4, turn on the double-pole double-throw switch 3 of the wireless charger, and then the battery 9 in the power management module is connected to the voltage-stabilized power supply circuit, and the electric energy starts to be transmitted from the battery 9, and passes through the transmitting coil of the transmitting module 10 forms a high-frequency alternating current signal, which is transmitted to the receiving coil 12 of the charging base 5 through the charging induction area 4, and then sent to the charging management module after passing through the rectification and voltage stabilization module, so that under the control of the lithium battery charging management chip 16 , to achieve effective charging of the lithium battery.

Claims (2)

1. A solar wireless charger, characterized in that: it includes a power transmitting base and a charging base, wherein the power transmitting base includes two parts of a power management module and a power transmitting module, and the charging base includes a power receiving rectifying and stabilizing module and Lithium battery charging management module has two parts; The power management module includes a solar panel, a storage battery, a double-pole double-throw switch, a voltage-stabilizing output circuit, and the voltage-stabilizing output circuit outputs two-stage voltages; the positive and negative output interfaces of the solar panel are connected to one of the double-pole double-throw switches. On one side, the positive and negative input interfaces of the stabilized power supply circuit are connected to the other side of the double-pole double-throw switch, and the middle two interfaces of the double-pole double-throw switch are connected to the positive and negative poles of the battery; The power transmission module includes a high-frequency square wave generating circuit, an operational amplifier buffer, a power amplifier part, a transmitting coil and a primary side compensation capacitor. The transmitting coil and the primary side compensation capacitor are connected in parallel to the circuit of the power amplifier part. The output is powered by the primary voltage; the output of the high-frequency square wave generating circuit is buffered by the op amp and connected to the power amplifier circuit, and is powered by the secondary voltage output by the regulated output circuit; The power receiving, rectifying and stabilizing module includes a receiving coil, a secondary side compensation capacitor, and a rectifying and stabilizing circuit. The power in the transmitting coil of the power transmitting module is received by the receiving coil. The rectifying and stabilizing circuit mainly includes a rectifying bridge and a filter capacitor. and adjustable integrated voltage regulator chip; after the receiving coil and secondary side compensation capacitor are connected in parallel, they are connected to the lithium battery charging management module through the rectifier bridge, filter capacitor and adjustable integrated voltage regulator chip, and the lithium battery charging management module is controlled by the lithium battery charging management chip. Unified control. 2. The solar wireless charger according to claim 1, characterized in that: the lithium battery charging management module includes a red indicator light and a green indicator light, which respectively indicate two states of charging and charging completion, and when the voltage drops, the lithium battery is charged. The management chip enters sleep mode to prevent the lithium battery from being recharged.