CN201054376Y - Mobile phone protective cover charger - Google Patents

Abstract

The utility model discloses a cell-phone protective sheath charger, including the protective sheath body of mobile devices such as holding cell-phone the accommodation space inboard or the outside of protective sheath body are equipped with the direct current backup battery that charges. The utility model has the advantages that: the standby power supply of mobile equipment such as a mobile phone, a PDA, an MP3 and the like is integrated with the protective outer sleeve, when the mobile equipment is in a power-off state, the output plug of the standby battery of the product can be directly connected with the mobile equipment, and meanwhile, the direct-current charging standby battery has perfect circuit protection measures.

Description

mobile phone case charger

technical field

The utility model relates to parts of a mobile device, in particular to a mobile phone protective case charger.

Background technique

At present, personalized mobile devices such as mobile phones, PDAs, and MP3 players are becoming more and more popular and popularized in large quantities because they are convenient to carry. These mobile devices are charged by the mains and through the original charger, which limits the portable function of these mobile devices to a certain extent; there are also some DC chargers on the market, but due to design defects, most of them are not beautiful enough to match The protective cover is closely combined to save space and be convenient to carry, and also reduces people's willingness to use it. At the same time, the DC charger in the prior art also has the disadvantage of insufficient circuit protection.

Utility model content

The purpose of the utility model is to overcome the above-mentioned defects in the prior art, and provide a mobile phone protective cover charger integrated with the protective cover of mobile devices such as mobile phones, beautiful in design, and convenient to carry.

Another purpose of the utility model is to provide a DC charging backup battery with perfect circuit protection measures that can be charged by the original charger of the mobile device.

The technical scheme of the utility model is as follows: construct a mobile phone protective cover charger, including a protective cover body for accommodating mobile devices such as mobile phones, and a DC charging backup battery is provided inside or outside the accommodating space of the protective cover body.

The protective cover body includes a front side panel and a rear side panel that form an accommodating space and are integrally formed, a hanging buckle installed on the rear side of the rear side panel, a DC charging backup battery connected to the front side of the rear side panel, and a connecting front side panel and the left side and the right side of the rear side piece, and the plug pocket for accommodating the charger output plug on the outside of the left side or the right side.

The protective cover body can also be implemented in the following way: it includes a front side panel and a rear side panel that form an accommodating space and are integrally formed, and a DC charging backup battery bag is provided on the outside of the rear side panel, and the DC charging backup battery bag A DC charging backup battery is placed inside, and a rotatable hanging buckle is installed on the outside of the DC charging backup battery bag.

The DC charging backup battery is in the shape of a cuboid matching the protective cover, with a lithium battery cell and a circuit board inside, and a charging input interface, a charging output interface, a charging switch and an indicator light outside.

A DC-DC step-down circuit is connected between the input interface of the charging backup battery and the lithium battery, a DC-DC step-up circuit is connected between the lithium battery and the output interface of the charging backup battery, and a DC-DC boost circuit is connected between the lithium battery and the DC- A switch is provided between the DC step-up circuits, and the charging input interface is connected to the output interface of the charger through a diode.

The DC-DC step-down circuit is connected to the charge constant current control circuit, and the DC-DC step-up circuit is connected to the discharge constant current control circuit; the negative pole of the lithium battery cell is respectively connected to the charger input interface and the The charger output interface, the positive electrode of the lithium cell is connected to the lithium battery protection circuit, and the lithium battery cell, the lithium battery protection circuit and the overcharge and overdischarge protection circuit form a battery protection circuit.

The DC-DC step-down circuit includes a single-chip microcomputer U1, an inductor L1, a filter capacitor C3, and voltage feedback resistors R6 and R7. The power input terminal of the single-chip microcomputer U1 is connected to the charger input interface, and the power output terminal of the single-chip microcomputer U1 passes through the inductor L1 and The filter capacitor C3 is grounded, the voltage feedback resistors R6 and R7 are connected in series, and one end is connected between the inductor L1 and the filter capacitor C3, and the other end is grounded, and the other input end of the single-chip microcomputer U1 is connected between the feedback resistors R6 and R7; The charging constant current control circuit includes a comparator U2C, resistors R19, R8, R16, capacitor C11, and an isolation diode D3. The positive input terminal of the comparator U2C is grounded through the detection resistor R16, the negative input terminal of the comparator U2C is grounded through the resistor R19, and the capacitor C11 and resistor R8 are respectively connected in parallel to the output terminal and the negative input terminal of the comparator U2C, and the output terminal of U2C is connected to the single chip microcomputer U1 through the isolation diode D3.

The DC-DC boost circuit includes a boost IC U3, a MOS field effect transistor Q3, a diode D5, an inductor L2 and resistors R13 and R14. After connecting, one end is connected to the negative pole of the power supply of the boost IC U3, the other end is connected to the positive pole of the boost IC U3 through the diode D5 and the inductor L2, the charger output interface is connected between the resistor R14 and the diode D5, and the gate of the MOS field effect transistor Q3 Connected to the boost IC U3, the drain is connected between the diode D5 and the inductor L2, the source is connected to the overcharge and overdischarge protection circuit; the discharge constant current control circuit includes a comparator U2D, resistors R15, R23, R22, capacitor C8, Isolation diode D7, resistors R23 and R22 are connected in series, one end is connected to the negative input end of comparator U2D, the other end is connected to the charger output interface and the positive input end of comparator U2D at the same time, resistor R15 and capacitor C8 are respectively connected in parallel to the output of comparator U2D terminal and negative input terminal, and the output terminal of U2D is connected to the single-chip microcomputer U1 through the isolation diode D7.

The overcharge and overdischarge protection circuit includes a power management IC U4 and a MOS field effect transistor U5 controlled on and off by the power management IC U4. The positive power input terminal of the power management IC U4 is connected to a DC-DC step-down circuit, and the MOS field effect The discharge control inlet of the tube U5 is connected to the DC-DC boost circuit, and the charge control inlet of the MOS field effect transistor U5 is connected to the DC-DC step-down circuit.

The detection resistor R16 is connected to the input interface of the charger through the comparators U2A, U2B and the two-color diode D1 in sequence.

The beneficial effects of the utility model are: this product integrates the backup power supply and protective jacket of mobile devices such as mobile phones, PDAs, and MP3s. Connect, you don’t need to take out your mobile phone or other devices from this protective case, you can directly charge your device, use the original charger to charge, with multiple protection functions including overcharge, overcurrent, overdischarge, short circuit, etc. .

Description of drawings

Fig. 1 is the three-dimensional view of embodiment one of the mobile phone protective case charger of the present invention;

Fig. 2 is another perspective view of Embodiment 1 of the mobile phone protective cover charger of the present invention;

Fig. 3 is the circuit block diagram of the utility model mobile phone protective case charger;

Fig. 4 is the circuit schematic diagram of the mobile phone protective case charger of the present invention;

Fig. 5 is a perspective view of Embodiment 2 of the mobile phone protective cover charger of the present invention;

Fig. 6 is another perspective view of the second embodiment of the mobile phone protective cover charger of the present invention

Detailed ways

Embodiment 1, referring to Fig. 1 and Fig. 2, provides a mobile phone protective case charger, including a protective case body 1 for accommodating mobile devices such as mobile phones, the protective case body 1 is made of leather as the main material, and it includes a housing Space and integrally formed front side panel 2 and rear side panel 3, hanging buckle 4 installed on the rear side of rear side panel 3, DC charger 5 connected to the front side of rear side panel 3, connecting front side panel 2 and rear side The left side piece 7 and the right side piece 6 of the piece 3, and the plug bag 8 fixed on the outside of the left side piece 7, the hanging buckle 4 can rotate 360 degrees, the DC charger 5 is in the shape of a cuboid matching the protective cover, and its outer wrapping There is a leather 9, and the leather 9 together with the internal DC charger 5 is fixed on the inner side of the rear side panel 3 by glue. The inside of the DC charger is provided with a lithium battery cell and a circuit board, and the outside is provided with a charger input interface 10 , a charger output interface 11 , a charging indicator light 12 and a switch 13 . The charger output interface 11 can be placed in the plug bag 8 when not in use.

Referring to Figure 3, the DC charger includes a lithium battery cell and a circuit board, and is externally provided with a charger input interface (that is, the charger input interface 10 in Figure 1), and a charger output interface (that is, the charger output interface in Figures 1 and 2). 11) and the charging indicator light (that is, the charging indicator light 12 in Figure 1 and Figure 2) is connected with a DC-DC step-down circuit between the charger input interface and the lithium battery cell, and is connected with a DC-DC step-down circuit between the lithium battery cell and the charger output interface. DC-DC step-up circuit, a switch (i.e. switch 13 in Fig. 1 and Fig. 2) is arranged between the lithium battery cell and the DC-DC step-up circuit, and the charger input interface is connected between the charger output interfaces through a diode .

The DC-DC step-down circuit is connected to the charge constant current control circuit, and the DC-DC step-up circuit is connected to the discharge constant current control circuit; the negative electrode of the lithium cell is respectively connected to the charger input interface and the charger output interface through the overcharge and overdischarge protection circuit. The positive electrode of the cell is connected to the lithium battery protection circuit, and the lithium battery cell, the lithium battery protection circuit and the overcharge and overdischarge protection circuit form a battery protection circuit.

Referring to Figure 4, the DC-DC step-down circuit includes a single-chip microcomputer U1 (AOZ1010), an inductor L1, a filter capacitor C3, and voltage feedback resistors R6 and R7. The power input terminal of the single-chip microcomputer U1 is connected to the charger input interface, and the power output terminal of the single-chip microcomputer U1 Ground through inductor L1 and filter capacitor C3 in turn, voltage feedback resistors R6 and R7 are connected in series, one end is connected between inductor L1 and filter capacitor C3, the other end is grounded, and the other input end of microcontroller U1 is connected between feedback resistors R6 and R7 Indirect connection; the charging constant current control circuit includes comparator U2C, resistors R19, R8, R16, capacitor C11, isolation diode D3, the positive input terminal of comparator U2C is grounded through detection resistor R16, and the negative input terminal of comparator U2C (LM324) The input terminal is grounded through the resistor R19, the capacitor C11 and the resistor R8 are respectively connected in parallel to the output terminal and the negative input terminal of the comparator U2C (LM324), and the output terminal of U2C is connected to the single chip microcomputer U1 through the isolation diode L4148.

When charging, use the original charger to output 5.0V power supply, through the DC-DC step-down circuit, the voltage is stabilized at 4.5V±0.01V, and then through the diode D4, the voltage is stabilized at 4.2V±0.01V to charge the battery. During the charging process, if the charging current is greater than the set current (300mA), the voltage drop generated on the current detection resistor R16 will also increase, and this voltage will be released by the comparator U2C (LM324), resistors R19, R8 and capacitor C11. After about 10 times, it is fed back to the voltage feedback terminal of the microcontroller U1 (AOZ1010) through the isolation diode D3 (L4148), and the charging current is kept constant at 300mA±20mA by reducing the output voltage. If the charging current is less than 300mA, the amplifying circuit does not operate, and the battery is charged with a constant voltage.

When using the original charger to charge this product and its mobile phone at the same time, turn the switch (that is, switch 13 in Figure 1 and Figure 2, S1 in Figure 4) to the "OFF" position. At this time, the charger will charge the opponent first, and when the opponent is almost fully charged, the circuit will automatically switch to charge the product.

The DC-DC boost circuit includes boost IC U3 (S-8355M20), MOS field effect transistor Q3 (AO3414), Schottky diode D5, inductor L2 and resistors R13 and R14, and the positive pole of the boost IC U3 passes through the switch Connect the positive pole of the lithium battery, connect the resistors R13 and R14 in series, and connect one end to the negative pole of the power supply of the boost ICU3, and the other end to connect the positive pole of the boost IC U3 through the diode D5 and inductor L2, and connect the charger output interface between the resistor R14 and the diode D5 , the gate of the MOS field effect transistor Q3 is connected to the boost IC U3, the drain is connected between the diode D5 and the inductor L2, and the source is connected to the charging and over-discharging protection circuit; the discharge constant current control circuit includes a comparator U2D, a resistor R15, R23, R22, capacitor C8, isolation diode D7 (L4148), resistors R23 and R22 are connected in series, one end is connected to the negative input end of the comparator U2D, and the other end is connected to the charger output interface and the positive input end of the comparator U2D. R15 and capacitor C8 are respectively connected in parallel to the output terminal and the negative input terminal of the comparator U2D, and the output terminal of U2D is connected to the single-chip microcomputer U1 through the isolation diode D7.

When discharging, turn the switch 13 (see Figure 1) to the "ON" position, and the battery voltage will be boosted by the boost circuit composed of boost ICS-8355M20, MOSFET AO3414, Schottky diode D5, resistors R13, R14, etc. to 5.0V±0.01. When charging the mobile phone, if the charging current is greater than the set current (650mA±50mA), the voltage drop generated on the current detection resistor R22 will also increase, and the voltage signal will pass through the comparator U2D (LM324), resistors R15, R23 and capacitors After C8 amplifies it about 30 times, it feeds back to the voltage feedback terminal of the boost IC S-8355M20 through the isolation diode L4148, and keeps the charging current constant at 650mA±50mA by reducing the output voltage. If the charging current of the mobile phone is less than 650mA±50mA, the amplifying circuit will not operate, and the mobile phone will be charged in a constant voltage manner.

The detection resistor R16 is connected to the input interface of the charger through the comparators U2A, U2B and the two-color diode D1 in turn. When the mobile phone protective case charger is charged, the voltage generated by the charging current on the current detection resistor R16 is the same as the comparator’s reference The voltage is compared, if the voltage is greater than the set reference voltage, it means that the charging is in progress, the comparator U2A outputs a low level, the red LED is on, the comparator U2B outputs a high level, and the green LED is off. If the voltage generated on the resistor R16 is lower than the set reference voltage, it means that the charging current is very small, the battery charging is over, the comparator U2A outputs a high level, the red LED is off, the comparator U2B outputs a low level, and the green LED is on.

The overcharge and overdischarge protection circuit includes a power management IC U4 (S-8261) and a MOS field effect transistor U5 (UPA1870) controlled by it. The positive power input terminal of the power management IC U4 is connected to a DC-DC step-down circuit. The discharge control inlet of the MOS field effect transistor U5 is connected to the DC-DC boost circuit, and the charge control inlet of the MOS field effect transistor U5 is connected to the DC-DC step-down circuit. The power management circuit mainly realizes the circuit between the battery and the circuit through the power management IC S-8261 to control the on and off of the MOSFET UPA1870, so as to protect the battery from overcharging, overdischarging, overcurrent, short circuit, etc.

Embodiment 2, referring to Fig. 5 and Fig. 6, provides a mobile phone protective case charger, including a protective case body 1 for accommodating mobile devices such as mobile phones, the protective case body 1 is made of leather as the main material, and it includes a housing Space and integrated front side piece 2 and back side piece 3, DC charger bag 14 installed on the outside of back side piece 3, hanging buckle 4 is installed on the outside of charger bag 14, DC charger bag 14 is installed in the outside Charger 5, the left side piece 7 and the right side piece connected to the front side piece 2 and the back side piece 3, and the plug bag 8 fixed on the outside of the left side piece 7, the hanging buckle 4 can rotate 360 degrees, and the DC charger 5 is Cooperating with the cuboid shape of the protective cover, the charger bag 14 and the internal DC charger 5 are fixed on the outside of the rear side panel 3 by means of stitching. The inside of the DC charger is provided with a lithium battery cell and a circuit board, and the outside is provided with a charger input interface 10 , a charger output interface 11 , a charging indicator light 12 and a switch 13 . The charger output interface 12 can be placed in the plug bag 8 when not in use. The circuit part of the second embodiment is the same as that of the first embodiment.

Claims (10)

1. A mobile phone protective cover charger, comprising a protective cover body for accommodating mobile devices such as mobile phones, characterized in that, a DC charging backup battery is provided on the inside or outside of the accommodation space of the protective cover body. 2. The mobile phone protective case charger according to claim 1, wherein the protective case body includes a front side piece and a rear side piece that form an accommodating space and are integrally formed, and a hanger mounted on the rear side of the rear side piece. buckle, DC charging backup battery connected to the front side of the rear side panel, the left and right panels connecting the front side panel and the rear side panel, and the plug pocket on the outside of the left or right panel to accommodate the charging output plug . 3. The mobile phone protective case charger according to claim 1, wherein the protective case body includes a front side piece and a rear side piece that form an accommodating space and are integrally formed, and the outer side of the rear side piece is provided with a DC A charging backup battery bag, a DC charging backup battery is placed in the DC charging backup battery bag, and a rotatable hanging buckle is installed on the outside of the DC charging backup battery bag. 4. The mobile phone protective case charger according to claim 2 or 3, characterized in that, the DC charging backup battery is in the shape of a cuboid matching the protective case, with a lithium battery cell and a circuit board inside, and a charger input outside. Interface, charger output interface, charging switch and indicator light. 5. The mobile phone protective case charger according to claim 4, wherein a DC-DC step-down circuit is connected between the charger input interface and the lithium battery cell, and a DC-DC step-down circuit is connected between the lithium battery cell and the charger output interface. A DC-DC boost circuit is connected, a switch is provided between the lithium battery cell and the DC-DC boost circuit, and the charger input interface is connected to the charger output interface through a diode. 6. The mobile phone protective cover charger according to claim 5, wherein the DC-DC step-down circuit is connected to a charging constant current control circuit, and the DC-DC step-up circuit is connected to a discharge constant current control circuit; The negative electrode of the lithium battery cell is connected to the charger input interface and the charger output interface respectively through the overcharge and overdischarge protection circuit, the positive electrode of the lithium battery cell is connected to the lithium battery protection circuit, and the lithium battery cell, the lithium battery protection circuit and the overcharge and overdischarge protection circuit constitute the battery protection circuit. . 7. The mobile phone protective case charger according to claim 6, wherein the DC-DC step-down circuit includes a single-chip microcomputer U1, an inductor L1, a filter capacitor C3 and voltage feedback resistors R6, R7, and the power input of the single-chip microcomputer U1 connected to the input interface of the charger, the power output terminal of the single-chip microcomputer U1 is grounded through the inductor L1 and the filter capacitor C3 in turn, the voltage feedback resistors R6 and R7 are connected in series, and one end is connected between the inductor L1 and the filter capacitor C3, and the other end is grounded. The other input terminal of U1 is connected between the feedback resistors R6 and R7; the charging constant current control circuit includes a comparator U2C, resistors R19, R8, R16, a capacitor C11, an isolation diode D3, and a positive input terminal of the comparator U2C The detection resistor R16 is grounded, the negative input terminal of the comparator U2C is grounded through the resistor R19, the capacitor C11 and the resistor R8 are respectively connected in parallel to the output terminal and the negative input terminal of the comparator U2C, and the output terminal of U2C is connected to the single chip microcomputer U1 through the isolation diode D3. 8. The mobile phone protective case charger according to claim 6, wherein the DC-DC boost circuit comprises a boost IC U3, a MOS field effect transistor Q3, a diode D5, an inductor L2 and resistors R13, R14, The positive pole of the power supply of the boost IC U3 is connected to the positive pole of the lithium battery through a switch. One end of the resistors R13 and R14 is connected in series to the negative pole of the power supply of the boost IC U3, and the other end is connected to the positive pole of the boost IC U3 through the diode D5 and the inductor L2. The resistor R14 The charger output interface is connected between the diode D5, the gate of the MOS field effect transistor Q3 is connected to the boost IC U3, the drain is connected between the diode D5 and the inductor L2, and the source is connected to the overcharge and overdischarge protection circuit; the discharge The constant current control circuit includes comparator U2D, resistors R15, R23, R22, capacitor C8, and isolation diode D7. After resistors R23 and R22 are connected in series, one end is connected to the negative input end of comparator U2D, and the other end is simultaneously connected to the charger output interface and comparator. The positive input terminal of the comparator U2D, the resistor R15 and the capacitor C8 are respectively connected in parallel to the output terminal and the negative input terminal of the comparator U2D, and the output terminal of the U2D is connected to the single chip microcomputer U1 through the isolation diode D7. 9. The mobile phone protective case charger according to claim 6, wherein the overcharge and overdischarge protection circuit includes a power management IC U4 and a MOS field effect transistor U5 controlled by it to be switched on and off, and the power management IC The positive power input terminal of U4 is connected to the DC-DC step-down circuit, the discharge control inlet of the MOS field effect transistor U5 is connected to the DC-DC boost circuit, and the charging control inlet of the MOS field effect transistor U5 is connected to the DC-DC step-down circuit circuit. 10. The mobile phone protective case charger according to claim 7, wherein the detection resistor R16 is connected to the input interface of the charger through the comparators U2A, U2B and the two-color diode D1 in sequence.

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