CN212486148U

CN212486148U - Sterilization and offline charging integrated structure for hearing aid

Info

Publication number: CN212486148U
Application number: CN202021040640.2U
Authority: CN
Inventors: 徐炜; 吴秋麒; 任国峰
Original assignee: Suzhou Soundlink Co ltd
Current assignee: Suzhou Soundlink Co ltd
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2021-02-05
Anticipated expiration: 2030-06-09

Abstract

The utility model discloses a sterilization and off-line charging integrated structure for hearing aids, which belongs to the technical field of hearing aid maintenance and comprises a box body, wherein a sterilization groove, a power supply interface and a battery bin are formed on the box body, a circuit board is connected inside the box body, a master control singlechip and a drying circuit are connected on the circuit board, the drying circuit is positioned below the sterilization, and the master control singlechip is connected between the drying circuit and the power supply interface and controls the drying circuit to generate heat; the cell wall of the sterilizing cell is connected with an ultraviolet sterilizing lamp, the circuit board is connected with an adjusting circuit, the adjusting circuit is connected between the ultraviolet sterilizing lamp and a power interface, and the power interface charges a button cell for charging in the battery bin through a charging chip. The utility model discloses have and effectively combine drying, disinfecting and the function of charging as an organic whole, effectively reduce the complexity of audiphone maintenance process, improve the effect that user's use was experienced by a wide margin.

Description

Sterilization and offline charging integrated structure for hearing aid

Technical Field

The utility model relates to a audiphone maintenance technical field, in particular to integrative structure is charged with disinfecting and off-line to audiphone.

Background

Hearing aids are sophisticated electronic products with stringent usage requirements. Most hearing aid users are old and disabled, the resistance is low, and the hearing aids are inevitably corroded by sweat and humid air, breed bacteria and viruses and harm the health of the users in daily use, so the users need to maintain the hearing aids such as drying and sterilizing every day;

hearing aids are important hearing aids, which have a high frequency of use and a long duration of use, and hearing aid-specific batteries require a long continuous discharge. The special battery for the hearing aid is a button battery generally in order to meet the volume requirement, and has higher requirement on the capacity of the special battery for the hearing aid in order to meet the long-time discharge requirement, so that the charging function needs to be added.

The following problems exist in the prior art: before carrying out the drying to audiphone, need take out button cell and use solitary charging device to charge in by audiphone battery storehouse, need use the dedicated sterilizing equipment of audiphone to kill virus after the drying, whole maintenance and charging process need three special audiphone instrument respectively, and the loaded down with trivial details difficult operation of process, and this problem is waited for to solve urgently.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a hearing aid is with disinfecting and off-line integrative structure that charges has the function of drying, disinfecting and charging and combines as an organic whole, effectively reduces the complexity of audiphone maintenance process, improves the effect that user's use was experienced by a wide margin.

A sterilization and offline charging integrated structure for a hearing aid comprises a box body, wherein a sterilization groove, a power supply interface and a battery bin are formed in the box body, a circuit board is connected inside the box body, a master control single chip microcomputer and a drying circuit are connected to the circuit board, the drying circuit is located below the sterilization, and the master control single chip microcomputer is connected between the drying circuit and the power supply interface and controls the drying circuit to generate heat;

the wall of the sterilizing tank is connected with an ultraviolet sterilizing lamp, the box body is connected with a sterilizing button, the circuit board is connected with an adjusting circuit for adjusting the brightness of the ultraviolet sterilizing lamp, the adjusting circuit is connected between the ultraviolet sterilizing lamp and a power supply interface, and the sterilizing button controls the working state of the ultraviolet sterilizing lamp by controlling the on-off of the adjusting circuit;

the button cell that charges is equipped with places in the battery compartment, is connected with charging chip on the circuit board, power source interface charges through charging chip to the button cell that charges in the battery compartment.

The utility model discloses further set up to: the adjusting circuit comprises a SY7200 constant current driving circuit, an inductor L1, a diode VD3, resistors R31 and R32 and a capacitor C5, the inductor L1 is connected between a pin 6 and a pin 1 of the SY7200 constant current driving circuit, the anode of the diode VD3 is connected with the pin 1 of the SY7200 constant current driving circuit, the cathode of the diode VD3 is respectively connected with the capacitor C5 and the resistor R31, the pin 3 of the SY7200 constant current driving circuit is connected with the R32, and the ultraviolet germicidal lamp is connected between the R31 and the R32.

The utility model discloses further set up to: the master control singlechip is an STC15W401AS master control singlechip, and the sterilization button is connected with a P5.5 interface of the master control singlechip.

The utility model discloses further set up to: the sterilizing tank is characterized in that a cover body is buckled above the sterilizing tank, a magnet is arranged in the cover body, a protection loop is connected to the circuit board and comprises a damping switch, a triode VT6 and an MOS tube VT7, the damping switch is connected with the positive pole of a power supply interface, a 3 interface of the damping switch is connected with the base of the triode VT6, the grid of the MOS tube VT7 is connected with a P3.2 interface of a master control single chip microcomputer, and the drain of the MOS tube VT7 is connected with a pin 1 of a SY7200 constant current driving circuit.

The utility model discloses further set up to: the shell is connected with a master control button for adjusting the drying time of the drying circuit to be 3h, 6h and 9h, and the master control button is connected with a P5.4 interface of the master control single chip microcomputer.

The utility model discloses further set up to: the box body is connected with a first indicator lamp, a second indicator lamp and a third indicator lamp corresponding to the drying time lengths of 3h, 6h and 9h, the first indicator lamp is connected with a P1.4 interface of the master control single chip microcomputer, the second indicator lamp is connected with a P1.3 interface of the master control single chip microcomputer, and the third indicator lamp is connected with a P1.2 interface of the master control single chip microcomputer.

The utility model discloses further set up to: the drying circuit comprises a PTC heating sheet, an MOS tube VT5, R26 and R27, wherein the PTC heating sheet is connected with a power supply interface, the grid electrode of the MOS tube VT5 is connected with a P3.1 interface of the main control single chip microcomputer through a main line, one end of the R26 is connected with the power supply interface, the other end of the R26 is connected with the main line, one end of the R27 is connected with the main line, and the other end of the R27 is grounded.

The utility model discloses further set up to: the power interface is a type-c interface, and the charging chip is a DS2711 chip.

The utility model discloses further set up to: a plurality of air holes are uniformly distributed on the cover body, and the cover body is an orange shading transparent plate.

The utility model discloses further set up to: the battery compartment sets up to two, corresponds two battery compartments on the circuit board and is connected with two sets of anti-overcharging return circuits.

The cover body is opened to place the hearing aid in the sterilization groove, the power interface is connected with a power supply, the cover body is buckled, the damping switch is conducted, the ultraviolet sterilization lamp is lightened, and the hearing aid is sterilized. And placing the button battery to be charged in the battery bin, and charging the battery placed in the battery bin through the charging chip. Pressing a master control switch, wherein when the master control switch is pressed, an indicator lamp is turned on, and a drying circuit heats for three hours; pressing two time indicator lamps to light up, and heating the drying circuit for six hours; and when three times of pressing, the indicator light is turned on three times, the drying circuit heats for nine hours, the drying time of the hearing aid is selected according to different requirements, and when four times of pressing, the heating circuit is turned off. Three requirements of daily use and maintenance of the hearing aid can be met through one device, and convenience is provided for users.

To sum up, the utility model discloses following beneficial effect has:

1. the drying circuit, the ultraviolet sterilizing lamp, the charging chip and the like are arranged, so that the integration of charging, drying and sterilizing can be realized, and convenience is provided for a user;

2. through the arrangement of the sterilization button, the ultraviolet sterilization lamp can be turned on again according to requirements after primary sterilization is finished, so that more requirements are met;

3. through the setting of total accuse button and three pilot lamps to adjust and show drying duration, so that adjust heating time as required.

Drawings

Fig. 1 is a schematic structural diagram for embodying the whole of the present invention;

fig. 2 is a circuit diagram of the present invention.

In the figure, 1, a box body; 11. a sterilization tank; 111. an ultraviolet germicidal lamp; 12. a power interface; 13. a battery compartment; 15. a sterilization button; 16. a cover body; 161. air holes are formed; 2. a master control singlechip; 3. a drying circuit; 4. a regulating circuit; 5. a charging chip; 6. a protection circuit; 61. a damping switch; 7. a master control button; 71. an indicator light I; 72. a second indicator light; 73. an indicator light III; 9. an anti-overcharge circuit.

Detailed Description

The present invention will be described in detail with reference to the attached drawings, and other advantages and effects of the present invention can be easily understood by those skilled in the art from the disclosure of the present specification. In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for the sake of clarity, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also regarded as the scope of the present invention without substantial changes in the technical content.

Example (b):

as shown in fig. 1 and fig. 2, for the utility model discloses a disinfection and off-line charging integrated structure for hearing aid, including box body 1, be formed with on the box body 1 and disinfect groove 11, power source 12 and battery compartment 13, the lock has lid 16 above the groove 11 that disinfects, and lid 16 is articulated with the box that disinfects. The box body 1 is internally connected with a circuit board 14, the circuit board 14 is connected with a main control single chip microcomputer 2 and a drying circuit 3, the drying circuit 3 is positioned below the sterilization tank 11, and the main control single chip microcomputer 2 is connected between the drying circuit 3 and a power interface 12 and controls the drying circuit 3 to heat;

an ultraviolet germicidal lamp 111 is connected to the wall of the sterilizing tank 11, a sterilizing button 15 is connected to the box body 1, an adjusting circuit 4 for adjusting the brightness of the ultraviolet germicidal lamp 111 is connected to the circuit board 14, the adjusting circuit 4 is connected between the ultraviolet germicidal lamp 111 and the power interface 12, and the sterilizing button 15 controls the working state of the ultraviolet germicidal lamp 111 by controlling the on-off state of the adjusting circuit 4;

the button cell that is equipped with to charge is placed in battery compartment 13, is connected with charging chip 5 on the circuit board 14, and power source 12 charges the button cell that is equipped with to charge in battery compartment 13 through charging chip 5.

As shown in fig. 2, the ultraviolet germicidal lamp 111 is a UV-LED, the adjusting circuit 4 includes a SY7200 constant current driving circuit, an inductor L1, a diode VD3, resistors R31 and R32, and a capacitor C5, the inductor L1 is connected between a pin 6 and a pin 1 of the SY7200 constant current driving circuit, an anode of the diode VD3 is connected to a pin 1 of the SY7200 constant current driving circuit, a cathode of the diode VD3 is connected to the capacitor C5 and the resistor R31, a pin 3 of the SY7200 constant current driving circuit is connected to the R32, and the ultraviolet germicidal lamp 111 is connected between the R31 and the R32.

A decoupling filter capacitor C4 is connected between the pin 6 and the pin 2 of the SY7200 constant current driving circuit and used for filtering power supply noise so as to ensure the stable work of the driving module. Pin 5 is an overvoltage protection terminal, and an overvoltage protection signal is collected by the output terminal of diode VD3 and then output to pin 5. The pin 3 is a feedback end, and the magnitude of the UV-LED working current can be adjusted by adjusting the resistance values of R31 and R30. The pin 4 is an enabling/dimming control end, and the brightness of the germicidal lamp can be adjusted by adjusting the proportion of input pulses.

As shown in fig. 2, the circuit board 14 is connected with a protection circuit 6, the protection circuit 6 includes a damping switch 61, a transistor VT6 and a MOS transistor VT7, the damping switch 61 is connected with the positive electrode of the power interface 12, the 3 interface of the damping switch 61 is connected with the base of the transistor VT6, the main control single chip microcomputer 2 is an STC15W401AS main control single chip microcomputer 2, the gate of the MOS transistor VT7 is connected with the P3.2 interface of the main control single chip microcomputer 2, the drain of the MOS transistor VT7 is connected with the pin 1 of the SY7200 constant current driving circuit, and the cover 16 is internally provided with a magnet.

When the cover body 16 is buckled with the drying chamber, an external magnetic field formed by a magnet in the cover body 16 acts on the Hall switch, when the magnetic induction intensity exceeds a conduction threshold BOP of the Hall switch, a 3 interface of the Hall switch is conducted and outputs a low level, the triode VT6 is cut off, at the moment, a P3.2 interface of the main control singlechip 2 outputs a high level to enable the MOS tube VT7 to be conducted, and a SY7200 constant current source driving circuit connected with the MOS tube VT7 is conducted to enable the bactericidal lamp to emit light;

when the cover body 16 is opened, the external magnetic field is far away from the Hall switch, the magnetic induction intensity rapidly drops and is lower than the conduction threshold BOP, the 3 interface of the Hall switch is cut off, the high level is output, VT6 is conducted, the MOS tube VT7 is cut off, the SY7200 constant current source driving circuit is disconnected, and the germicidal lamp is extinguished.

As shown in fig. 2, the sterilization button 15 is connected to the P5.5 interface of the main control single chip microcomputer 2. The on-time of the ultraviolet sterilizing lamp 111 is timed to be 30min through the main control single chip microcomputer 2, after 30min is finished, the P3.2 interface of the main control single chip microcomputer 2 outputs low level to stop the MOS tube VT7, the SY7200 constant current source driving circuit is disconnected, the sterilizing lamp is extinguished, and when the sterilizing duration is not satisfactory enough, the sterilizing button 15 is pressed to start the sterilizing ultraviolet lamp for sterilizing and disinfecting.

As shown in fig. 2, the drying circuit 3 includes a PTC heating sheet, MOS transistors VT5, R26, and R27, the PTC heating sheet is connected to the power supply interface 12, the gate of the MOS transistor VT5 is connected to the P3.1 interface of the main control single chip microcomputer 2 through a main line, one end of R26 is connected to the power supply interface 12, the other end is connected to the main line, one end of R27 is connected to the main line, and the other end is grounded.

As shown in fig. 1 and fig. 2, a master control button 7 for adjusting the drying time of the drying circuit 3 to be 3h, 6h and 9h is connected to the housing, and the master control button 7 is connected to a P5.4 interface of the master control single chip microcomputer 2. Corresponding to drying duration 3h, 6h and 9h on box body 1 is connected with pilot lamp one 71, pilot lamp two 72 and pilot lamp three 73, and pilot lamp one 71 links to each other with the P1.4 interface of master control singlechip 2, and pilot lamp two 72 links to each other with the P1.3 interface of master control singlechip 2, and pilot lamp three 73 links to each other with the P1.2 interface of master control singlechip 2.

The master control button 7 is pressed once, the timing drying circuit 3 is heated for three hours, and meanwhile, the first indicator lamp 71 emits light; the master control button 7 is pressed twice, the timing drying circuit 3 is heated for six hours, and meanwhile, the second indicator lamp 72 emits light; pressing the master control button 7 three times, heating the timing drying circuit 3 for nine hours, and simultaneously, emitting light by the indicator lamp III 73; when the master control button 7 is pressed four times, the drying circuit 3 is turned off. Setting a cycle period every four times, entering the next cycle period according to the fifth time, namely, the fifth time is three hours, the sixth time is six hours, the seventh time is nine hours, and the steps are repeated continuously.

After the master control switch is pressed, the P3.1 interface of the master control singlechip 2 outputs high level, the current passes through R27 and R26 to form a channel, the voltage drop generated on R27 is the grid voltage for turning on the MOS tube VT5, and the MOS tube VT5 is conducted at the moment; the current passes through the conducted MOS tube VT5 to the power supply cathode, the heating main loop forms a passage, the PTC electric heating tube is electrified to generate heat for heating, and the heat generated by the PTC heating tube dries the hearing aid in the dry sterilizing chamber at high temperature.

As shown in fig. 1, a plurality of air holes 161 are uniformly distributed on the cover 16, and the cover 16 is an orange light-shielding transparent plate. In the drying and sterilization processes of the hearing aid, the air holes 161 can well balance the internal and external pressure and keep the temperature stable, so that the condition that the hearing aid is damaged due to long-time heating is not easy to occur; the orange shading transparent plate can well shade ultraviolet rays, so that the ultraviolet rays are not easy to leak, and the indoor state of the sterilization chamber can be conveniently observed.

As shown in fig. 1 and 2, two battery compartments 13 are provided, and two sets of overcharge prevention loops 9 are connected to the circuit board 14 corresponding to the two battery compartments 13. The two groups of anti-overcharging loops 9 are respectively composed of a sampling loop, a discharging loop and a control loop. The power supply interface 12 is a type-c interface, the charging chip 5 is a DS2711 chip, the power supply interface 12 is connected with a CC1 interface and a CC2 interface of the charging chip 5, triodes VT1 and VT2 are respectively connected between the power supply interface 12 and the CC1 interface and the CC2 interface, and the two groups of battery bins 13 are connected with a VP1 interface and a VP2 interface of the charging chip 5 and collectors of the triodes VT1 and VT 2;

taking a group of anti-overcharging loops 9 as an example, the sampling loop comprises R17 and RP1, R17 is connected in series with RP1 and then connected in parallel with the battery compartment 13, and a middle pin of the RP1 is connected with a P1.0 interface of the main control singlechip 2. The discharging loop comprises R16 and a triode VT3, the base electrode of VT3 is connected with the P3.6 interface of the master control singlechip 2, and the emitter electrode is connected with R16. The control circuit comprises an optical coupler IC3, a light emitting diode of the optical coupler IC3 is connected with a P3.0 interface of the master control single chip microcomputer 2, a phototriode of the optical coupler IC3 is connected with an emitting electrode of VT1, and a base electrode of VT1 is connected with a CC1 interface of the charging chip 5.

Sampling circuit samples the voltage of battery compartment 13 and transmits for master control singlechip 2, when master control singlechip 2 detected that battery compartment 13 both ends voltage is greater than 0.9V and is less than 1.3V, sends two instructions:

the first instruction is that: the P3.6 interface outputs high level to make VT3 forward biased and conducted, the battery in the first main charging position 3 passes through the positive pole → R16 → VT3 collector → VT3 emitter to ground → returns to the negative pole of the first main charging position 3 through ground to form a discharging loop;

and a second instruction: the P3.0 interface outputs low level, the light emitting diode of the optocoupler IC3 is forward biased to be conducted to emit light, the phototriode is conducted by illumination, the VT1 is reversely biased to be cut off, and the connection with the CC1 interface of the charging chip 5 is cut off, so that the discharging state of the battery in the battery compartment 13 is maintained.

When the main control single chip microcomputer 2 detects that the voltage of the battery compartment 13 is less than 0.9V, two instructions are sent out simultaneously:

and instruction three: the output low level of the port P3.6 enables VT3 to be reversely biased and cut off, a discharging path is cut off, and the battery stops discharging;

and fourth, instruction: the P3.0 port outputs high level, the light emitting diode of the optocoupler IC3 is reversely biased to cut off, the light emitting is stopped, the phototriode is cut off due to no illumination, the VT1 is controlled by the P3.0 port, the base electrode is connected with the CC1 interface of the charging chip 5 to recover, and the collector electrode returns to the normal charging state of the battery compartment 13.

The implementation principle of the above embodiment is as follows: the hearing aid is placed in the sterilization tank 11 by opening the cover 16, the power source 12 is powered on, the cover 16 is fastened, the damping switch 61 is turned on, and the ultraviolet sterilization lamp 111 is turned on to sterilize the hearing aid. The button battery to be charged is placed in the battery cabin 13, and the battery placed in the battery cabin 13 is charged through the charging chip 5. Pressing a master control switch, wherein when one button is pressed, the first indicator lamp 71 is lightened, and the drying circuit 3 heats for three hours; when the second indicator light 72 is pressed for two times, the drying circuit 3 heats for six hours; pressing three times, the indicator lamp three 73 lights up, the drying circuit 3 heats for nine hours, the drying time of the hearing aid is selected according to different requirements, and the heating circuit is turned off when pressing four times. Three requirements of daily use and maintenance of the hearing aid can be met through one device, and convenience is provided for users.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides a hearing aid is with disinfecting and integrative structure that off-line charges which characterized in that: the drying box comprises a box body (1), wherein a sterilization groove (11), a power interface (12) and a battery bin (13) are formed in the box body (1), a circuit board (14) is connected inside the box body (1), a main control single chip microcomputer (2) and a drying circuit (3) are connected to the circuit board (14), the drying circuit (3) is located below the sterilization groove (11), and the main control single chip microcomputer (2) is connected between the drying circuit (3) and the power interface (12) and controls the drying circuit (3) to generate heat;

an ultraviolet germicidal lamp (111) is connected to the wall of the sterilizing tank (11), a sterilizing button (15) is connected to the box body (1), an adjusting circuit (4) for adjusting the brightness of the ultraviolet germicidal lamp (111) is connected to the circuit board (14), the adjusting circuit (4) is connected between the ultraviolet germicidal lamp (111) and the power interface (12), and the sterilizing button (15) controls the working state of the ultraviolet germicidal lamp (111) by controlling the on-off state of the adjusting circuit (4);

the button cell that is equipped with to charge is placed in battery compartment (13), is connected with charging chip (5) on circuit board (14), power source (12) charges the button cell that is equipped with to charge in battery compartment (13) through charging chip (5).

2. The integrated structure of sterilization and offline charging for a hearing aid according to claim 1, wherein: the adjusting circuit (4) comprises a SY7200 constant current driving circuit, an inductor L1, a diode VD3, resistors R31 and R32 and a capacitor C5, the inductor L1 is connected between a pin 6 and a pin 1 of the SY7200 constant current driving circuit, the anode of the diode VD3 is connected with the pin 1 of the SY7200 constant current driving circuit, the cathode of the diode VD3 is respectively connected with the capacitor C5 and the resistor R31, the pin 3 of the SY7200 constant current driving circuit is connected with the R32, and the ultraviolet germicidal lamp (111) is connected between the R31 and the R32.

3. The integrated structure of sterilization and offline charging for a hearing aid according to claim 1, wherein: the master control singlechip (2) is an STC15W401AS master control singlechip (2), and the sterilization button (15) is connected with a P5.5 interface of the master control singlechip (2).

4. The integrated structure of sterilization and offline charging for a hearing aid according to claim 3, wherein: the utility model discloses a sterilization tank, including sterilization tank (11), lid (16) top lock has lid (16), lid (16) embeds there is magnet, is connected with protection return circuit (6) on the circuit board, protection return circuit (6) are including damping switch (61), triode VT6 and MOS pipe VT7, damping switch (61) link to each other with power source (12) positive pole, the 3 interfaces of damping switch (61) link to each other with triode VT 6's base, MOS pipe VT 7's grid links to each other with the P3.2 interface of master control singlechip (2), MOS pipe VT 7's drain electrode links to each other with SY7200 constant current drive circuit's pin 1.

5. The integrated structure of sterilization and offline charging for a hearing aid according to any one of claims 1 to 4, wherein: the drying device is characterized in that a master control button (7) used for adjusting the drying time of the drying circuit (3) to be 3h, 6h and 9h is connected to the box body (1), and the master control button (7) is connected with a P5.4 interface of the master control single chip microcomputer (2).

6. The integrated structure of sterilization and offline charging for a hearing aid according to claim 5, wherein: it is connected with pilot lamp (71), pilot lamp two (72) and pilot lamp three (73) to correspond drying duration 3h, 6h and 9h on box body (1), pilot lamp one (71) links to each other with the P1.4 interface of master control singlechip (2), pilot lamp two (72) link to each other with the P1.3 interface of master control singlechip (2), pilot lamp three (73) link to each other with the P1.2 interface of master control singlechip (2).

7. The integrated structure of sterilization and offline charging for a hearing aid according to claim 3, wherein: drying circuit (3) include PTC heating plate, MOS pipe VT5, R26 and R27, the PTC heating plate links to each other with power source (12), MOS pipe VT 5's grid links to each other through the P3.1 interface of a thread with master control singlechip (2), R26 one end links to each other with power source (12), and the other end is connected on the main line, R27 one end links to each other with the thread, and the other end ground connection.

8. The integrated structure of sterilization and offline charging for a hearing aid according to claim 1, wherein: the power interface (12) is a type-c interface, and the charging chip (5) is a DS2711 chip.

9. The integrated structure of claim 4, which is used for sterilization and off-line charging of a hearing aid, and comprises: a plurality of air holes (161) are uniformly distributed on the cover body (16), and the cover body (16) is an orange shading transparent plate.

10. The integrated structure of sterilization and offline charging for a hearing aid according to claim 1, wherein: the battery compartment (13) sets up to two, corresponds two battery compartments (13) on the circuit board and is connected with two sets of anti-overcharging return circuits (9).