CN208190323U - A kind of children's science and education toy mobile power source - Google Patents

Abstract

The utility model relates to a kind of children's science and education toy mobile power sources, including rechargeable battery, battery circuit, shell and tenon；Inside housings, shell is equipped with power switch, power source charges port and USB5V/3A electric discharge port for rechargeable battery and battery circuit setting；Battery circuit includes circuit protection unit and Power Management Unit; rechargeable battery is connect with circuit protection unit; circuit protection unit is connect with Power Management Unit, and Power Management Unit is electrically connected with power switch, power source charges port and USB5V/3A electric discharge port respectively；Tenon is arranged in hull outside, tenon includes tenon main body and the multiple cambered surfaces being arranged on the outside of tenon main body protrusion, the cross section of each cambered surface protrusion is arc, and the length direction of cambered surface protrusion is arranged along the plug orientation of tenon, and tenon main body is connected by cambered surface protrusion and mortise.Mobile power source provided by the utility model can power for children's science and education toy, and safety is good, output power.

Description

A kind of children's science and education toy mobile power source

Technical field

The utility model relates to mobile power source technical field more particularly to a kind of children's science and education toy mobile power sources.

Background technique

With the gradually development of artificial intelligence, all kinds of intelligent machines are more more and more universal, all promising children's design of many families The machinery such as science and education toy, mechanical driving is necessarily required to lithium battery and polymer battery core battery, and mechanical more complicated, for electricity The power supply level requirement in source is higher, many biggish mechanical it is generally necessary to which powerful mobile power source could drive.

The current mobile power source overwhelming majority is applied to mobile phone, MP3, digital camera, tablet computer and DV machine towards adult Equal digital products, the factor mainly considered are portable light, and charging rate is fast and design is beautiful.And rarely face To the mobile power source of children, the high-power mobile power source being especially for use in the machinery equipments such as children's science and education toy.In addition, youngster Requirement of the virgin mobile power source to safety is higher, and existing product is for children, and most of there are security risks.

Utility model content

The purpose of the utility model is to provide a kind of safe and reliable and power that the science and education toy for children uses is larger Mobile power source.

To achieve the goals above, the utility model provides a kind of children's science and education toy mobile power source, comprising: chargeable Battery, battery circuit, shell and at least one tenon；

The rechargeable battery and the battery circuit are arranged in the enclosure interior, and the shell is opened equipped with power supply Pass, power source charges port and USB5V/3A electric discharge port；

The battery circuit includes circuit protection unit and Power Management Unit, and the rechargeable battery and the circuit are protected Protect unit connection, the circuit protection unit connect with the Power Management Unit, the Power Management Unit respectively with it is described Power switch, the power source charges port and USB5V/3A electric discharge port electrical connection；

At least one tenon setting is in the hull outside, and for being cooperatively connected with mortise, the tenon includes tenon Head main body and the multiple cambered surfaces being arranged on the outside of tenon main body protrusion, the cross section of each cambered surface protrusion are arc, And the length direction of the cambered surface protrusion is arranged along the plug orientation of the tenon, the tenon main body passes through the cambered surface protrusion It is connected with the mortise.

Preferably, the Power Management Unit includes power management chip, double P-channel MOSFET chips and double N-channels MOSFET chip, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, inductance, first capacitor to the 9th capacitor, first resistor to the 6th resistance, and First light emitting diode to the 4th light emitting diode；

After power source charges port is in parallel with the 4th capacitor, the input power detection pin of one end and power management chip connects It connects, another termination signal ground；The anode of power source charges port is additionally coupled to the drain electrode of the first metal-oxide-semiconductor；The source electrode of first metal-oxide-semiconductor connects The chip system power pins of power management chip are connected to, the source electrode of the first metal-oxide-semiconductor also passes through first capacitor in parallel, the second electricity Hold and third capacitance connection signal ground；The counnter attack that the grid of first metal-oxide-semiconductor is connected to power management chip fills control pin；

The chip system power pins of power management chip simultaneously with the first source lead of double P-channel MOSFET chips and The connection of second source lead；After the first grid pin of double P-channel MOSFET chips is connected with second grid pin, with power supply pipe Manage the PMOS tube hardware controls pin connection of chip；First drain lead of double P-channel MOSFET chips is to the 4th drain lead It is connect after connection with the first end of inductance；The second end of inductance is by being connected to circuit after third capacitor and the 4th capacitor in parallel The anode of protection location；The second end of inductance is also connect with the high-side current of power management chip sampling pin, power management core The anode pin of piece is connected to the anode of circuit protection unit；Circuit guarantor is connected to after 8th capacitor and the 9th capacitor are in parallel It protects between the anode and signal ground of unit；

First drain lead of double N-channel MOS fet chips to the 4th drain lead and the first end of inductance connects, double N ditches First source lead of road MOSFET chip is connected with the second source lead is followed by signal ground；The of double N-channel MOS fet chips It is connect after one gate lead and the connection of second grid pin with the NMOS tube hardware controls pin of power management chip；

The push button signalling input pin and signal ground of power management chip are connected to after power switch is in parallel with the 7th capacitor Between；

After USB5V/3A electric discharge port is in parallel with the 5th capacitor, the chip system power pins of one end and power management chip Connection, the drain electrode of the second metal-oxide-semiconductor of another termination；The grid and source electrode of second metal-oxide-semiconductor pass through the 6th capacitance connection, and the 2nd MOS The closing USB output pin of the grid connection power management chip of pipe；The electricity of the source electrode connection power management chip of second metal-oxide-semiconductor Stream detection pin anode；The current detecting pin anode of power management chip connects letter by the 5th resistance and the 6th resistance in parallel Number ground.

Preferably, the circuit protection unit includes circuit protection chip, N-channel MOS fet chip, the 7th resistance, the tenth Capacitor, the 11st capacitor and rechargeable battery；

After 4 negative pins connection of circuit protection chip, it is connect with the cathode of circuit protection unit；Circuit protection chip Energization pins and the anode of rechargeable battery connect, and be connected to the anode of circuit protection unit；3 of circuit protection chip It is connect after grounding pin connection with the cathode of rechargeable battery；The anode of rechargeable battery also passes through concatenated 7th resistance and the 11 capacitance connections to rechargeable battery cathode；

The first grid pin and second grid pin of N-channel MOS fet chip and the cathode of circuit protection unit connect, And pass through the first source lead of the tenth capacitance connection to N-channel MOS fet chip；First drain electrode of N-channel MOS fet chip is drawn Foot and the second drain lead are connected；The closing USB of the second source lead connection power management chip of N-channel MOS fet chip is defeated Pin out.

Preferably, the shell is also embedded with 4 LED lights, 4 LED lights with the power management Unit electrical connection, for showing the remaining capacity of the rechargeable battery.

Preferably, further include mortise that at least one matches with the tenon；The shell is rectangle, the power supply Switch and 4 LED light settings are set in the shell front, the power source charges port and USB5V/3A electric discharge port It sets in the housing side, the tenon and the mortise are arranged at the back side of shell.

Preferably, the tenon main body is hollow structure.

Preferably, the cross section of the inner and outer wall of the tenon main body is square, each of described tenon main body The cambered surface protrusion there are two being all provided on side, or

The cambered surface protrusion is equipped on each angle of the tenon main body.

Preferably, the equal length of the length of the cambered surface protrusion and the tenon main body, and setting spaced in parallel to each other.

Preferably, the tenon is 90 ° of rotational symmetry structures.

Preferably, the height of the cambered surface protrusion is not less than 1/5th of the tenon body width, no more than described The one third of tenon body width.

The above-mentioned technical proposal of the utility model have the advantages that the utility model provide a kind of output electric current compared with Greatly, the biggish mobile power source of power can be used for powering for more complicated children's science and education toy of structure etc. is mechanical, fill up market The upper blank without being directed to the high-power mobile power source that children use, and the mobile power source is provided with circuit protection unit, it can be real Existing over-charging of battery protection, battery short circuit protection and battery Cross prevention, have a safety feature, and are suitable for children and use.Outside mobile power source Side is additionally provided at least one tenon, and the module that mortise can be equipped with other carries out grafting, is packed into children's science and education toy, interest By force, easy to use, it is not take up exceptional space.

Detailed description of the invention

Fig. 1 is children's science and education toy mobile power source front schematic view in the utility model embodiment；

Fig. 2 is children's science and education toy mobile power source schematic rear view in the utility model embodiment；

Fig. 3 is battery circuit schematic diagram in the utility model embodiment；

Fig. 4 is Power Management Unit circuit diagram in the utility model embodiment；

Fig. 5 is circuit protection unit circuit diagram in the utility model embodiment.

In figure: 1: power switch；2:LED indicator light；3:USB5V/3A electric discharge port；4: power source charges port；5: tenon；

100: rechargeable battery；200: battery circuit；201: circuit protection unit；202: Power Management Unit.

Specific embodiment

It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is a part of the embodiment of the utility model, instead of all the embodiments.Based on the reality in the utility model Apply example, those of ordinary skill in the art's every other embodiment obtained without making creative work, all Belong to the range of the utility model protection.

As depicted in figs. 1 and 2, a kind of children's science and education toy mobile power source provided by the embodiment of the utility model, including can Rechargeable battery 100, battery circuit 200, shell and at least one tenon 5, specific connection relationship are as follows:

Inside housings, shell is equipped with power switch 1, power source charges for rechargeable battery 100 and the setting of battery circuit 200 Port 4 and USB5V/3A electric discharge port 3.

Battery circuit in the utility model embodiment is as shown in figure 3, battery circuit 200 includes 201 He of circuit protection unit Power Management Unit 202, rechargeable battery 100 are connect with circuit protection unit 201, circuit protection unit 201 and power management Unit 202 connects, and Power Management Unit 202 is electric with power switch 1, power source charges port 4 and USB5V/3A electric discharge port 3 respectively Connection.

As shown in Fig. 2, the setting of at least one tenon 5 is in hull outside, for being cooperatively connected with mortise, tenon 5 includes tenon Head main body and the multiple cambered surfaces being arranged on the outside of tenon main body protrusion, the cross section of each cambered surface protrusion is arc, and cambered surface is convex The length direction risen is arranged along the plug orientation of tenon 5, and tenon main body is connected by cambered surface protrusion and mortise.

In use, using tenon 5 by mobile power source and other children's science and education toys, such as the grafting machine equipped with mortise People's module etc., is stitched together.Then power switch is pressed to the power supply port of grafting robot with power supply line connection mobile power source 1 can power for grafting robot, and after closing grafting robot, mobile power source is automatically powered off.

Children's science and education toy mobile power source provided by the utility model is equipped with USB5V/3A and discharges port 3, discharge current is big, Power is high, can meet the needs of more complicated machinery, realizes the high-power power supply of stablizing to grafting robot, and shell is interior Portion is equipped with circuit protection unit 201, and circuit protection unit 201 plays the role of current limliting and protection to rechargeable battery 100, prevents The situations such as the electric leakage of rechargeable battery 100 damage children.

The mobile power source is equipped with tenon 5, and tenon 5 can be inserted among matched mortise, realizes mobile power source and other Mobile power source is packed among children's science and education toy by the connection of grafting robot module, saves space, and increase interest.

Preferably, as shown in Fig. 2, tenon main body is hollow structure, hollow structure makes tenon 5 can shape in a wider context Become, convenient for children voluntarily carries out grafting.It is further preferred that the cross section of the inner and outer wall of tenon main body is square, Cambered surface protrusion there are two being all provided on each side of tenon main body, the length of cambered surface protrusion and the equal length of tenon main body, and Parallel interval is arranged each other.Tenon 5 is 90 ° of rotational symmetry structures, is still inserted into mortise after being rotated by 90 °, preferably Ground, two cambered surface protrusions are close to the edge of outer wall.

In another embodiment, a cambered surface protrusion, tenon can also be equipped on each angle of rectangular tenon main body Head main body is contacted by the protrusion on four angles with mortise.

It is further preferred that the height of cambered surface protrusion is not less than 1/5th of the tenon body width, it is not more than institute The one third of tenon body width is stated, guarantees the stable structure of tenon 5 and mortise grafting.Tenon 5 passes through cambered surface protrusion and the fourth of the twelve Earthly Branches Hole contact, contact area is smaller, and tenon 5 can overcome the problems, such as to cooperate difficulty to ask caused by because of machining accuracy by generating deformation Topic reduces the requirement to machining accuracy, but simultaneously still can be mating with mortise, will not generate shaking or abjection easily Mortise.

For convenience of the state of charge of display mobile power source, it is preferable that shell front is also embedded with 4 LED lights 2,4 LED light 2 is electrically connected with Power Management Unit, for showing the remaining capacity of rechargeable battery 100.

It is further preferred that the mobile power source in the present embodiment is additionally provided at least one and 5 phase of tenon for convenience of using The mortise (not shown) matched.The shell of mobile power source is rectangle, and power switch 1 and 4 LED light 2 is arranged in shell Body front, power source charges port 4 and USB5V/3A electric discharge port 3 are arranged in housing side, and tenon 5 and mortise are arranged at shell The back side, mortise may be disposed at (not shown) in the boss of back side of shell protrusion, avoid the battery circuit for influencing enclosure interior 200。

In a preferred embodiment, as shown in figure 4, Power Management Unit 202 includes power management chip U1, double P Channel mosfet chip U2, double N-channel MOS fet chip U3, the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, inductance L1, first capacitor C1 is to the 9th capacitor C9, first resistor R1 to the 6th resistance R6, the first light emitting diode D1 to the 4th light emitting diode D4.Wherein The chip that model ZS6300A can be used in power management chip U1 realizes that the first metal-oxide-semiconductor Q1 can be used model CJ2333's Metal-oxide-semiconductor realizes that the metal-oxide-semiconductor that model CJ3420 can be used in the second metal-oxide-semiconductor Q2 is realized.

As shown in figure 4, after first port P1 is in parallel with the 4th capacitor C4, the input power of one end and power management chip U1 Detect pin VIN connection, another termination signal ground GND.Power source charges port 4 in first port P1, that is, Fig. 1 and Fig. 2 is used It is connected in external power supply.

The anode of first port P1 is additionally coupled to the drain electrode of the first metal-oxide-semiconductor Q1, and the source electrode of the first metal-oxide-semiconductor Q1 is connected to power supply The chip system power pins SYS of managing chip U1, the source electrode of the first metal-oxide-semiconductor Q1 also pass through first capacitor C1 in parallel, second Capacitor C2 and third capacitor C3 connection signal ground GND.The counnter attack that the grid of first metal-oxide-semiconductor Q1 is connected to power management chip U1 fills Pin REVCTR is controlled, counnter attack filling control pin REVCTR is that input counnter attack fills PMOS tube control pin.

The first source with double P-channel MOSFET chip U2 simultaneously the chip system power pins SYS of power management chip U1 Pole pin S1 and the second source lead S2 connection, the first grid pin G1 and second grid of double P-channel MOSFET chip U2 draw After foot G2 connection, it is connect with the PMOS tube hardware controls pin PGATE of power management chip U1.PMOS tube hardware controls pin PGATE is PWM synchronous rectification PMOS tube hardware controls pin.

With the of inductance L1 after the drain lead D4 connection of the first drain lead D1 to the 4th of double P-channel MOSFET chip U2 One end connection.The second end of inductance L1 is by being connected to third port P3 just after third capacitor R3 and the 4th capacitor R4 in parallel Pole.The second end of inductance L1 is also connect with the high-side current of power management chip U1 sampling pin SNS, power management chip U1's Anode pin BAT is connected to the anode of third port P3.Third is connected to after 8th capacitor C8 and the 9th capacitor C9 are in parallel Between the anode and signal ground GND of port P3.Third port P3 is the port connecting with the circuit protection unit 201 in Fig. 5, the The positive P+ of three port P3 is the positive P+ of circuit protection unit 201 in Fig. 5, and the cathode P- of third port P3 is in Fig. 5 P-.

The first end of the first drain lead D1 to the 4th drain lead D4 and inductance L1 of double N-channel MOS fet chip U3 connect It connects, the first source lead S1 of double N-channel MOS fet chip U3 and the second source lead S2 connection are followed by signal ground GND；Double N ditches NMOS tube after the first grid pin G1 of road MOSFET chip U3 and the G2 connection of second grid pin with power management chip U1 The NGATE connection of hardware controls pin.NMOS tube hardware controls pin NGATE is PWM synchronous rectification NMOS tube hardware controls pin.

The push button signalling input pin TAP of power management chip U1 is connected to after key switch K1 is in parallel with the 7th capacitor C7 Between signal ground GND.Power switch 1 in key switch K1, that is, Fig. 1 can be used for controlling mobile power source and open or close work State.The chip power of power management chip U1 pin PGND meet signal ground GND.

After second port P2 is in parallel with the 5th capacitor C5, the chip system power pins of one end and power management chip U1 SYS connection, the drain electrode of the second metal-oxide-semiconductor Q2 of another termination.USB5V/3A electric discharge port in second port P2, that is, Fig. 1 and Fig. 2 3, for being connected with load.The grid of second metal-oxide-semiconductor Q2 is connected with source electrode by the 6th capacitor C6, and the grid of the second metal-oxide-semiconductor Q2 Pole is also connected with the closing USB output pin CTR of power management chip U1, and closing USB output pin CTR is to close USB output NMOS hardware controls pin.The source electrode of second metal-oxide-semiconductor Q2 is also connected with the current detecting pin anode CS of power management chip U1, electricity Stream detection pin anode CS is that RCS ohmic load loop current detects pin anode.The current detecting of power management chip U1 is drawn Foot anode CS meets signal ground GND by the 5th resistance R5 and the 6th resistance R6 in parallel.

The first LED driving pin LED025 to the 4th LED driving pin LED100 of power management chip U1 passes through respectively First light emitting diode D1 is connected to the first end of first resistor R1, the second end of first resistor R1 to the 4th light emitting diode D4 It is connected to the source electrode of the first metal-oxide-semiconductor Q1.4 LED indications of the first light emitting diode D1 into the 4th light emitting diode D4, that is, Fig. 1 Lamp 2.The flashlight pin WLED of power management chip U1 meets signal ground GND by second resistance R2.

For Power Management Unit 202 using power management chip U1 as core, power management chip U1 can be to rechargeable battery 100 Carry out trickle/constant current/constant voltage three stage charging system.Trickle charge is carried out when the voltage of rechargeable battery 100 is lower than 3V；Work as voltage Constant-current charge is carried out when higher than 3V；Constant-voltage charge is carried out when voltage is close to 4.2V, the electric current to charge at this time starts to be gradually reduced, When electric current is reduced to the 1/10 of constant-current charge electric current, 4 LED lights 2 are all always on, and instruction rechargeable battery 100 is It is full of.Full of when, rechargeable battery 100 terminate charging, wait rechargeable battery 100 voltage drop as low as certain threshold voltage (VRECHG) (Recharge) is filled when again.

There is power management chip U1 key switch K1 to start the playing function when filling, and ensure that USB5V/3A electric discharge port 3 The preferential power supply of the load of connection.If in charging process herein, USB5V/3A electric discharge port 3 is connected to load simultaneously will be to negative Power supply is carried, can be activated by key switch K1 and be put when filling, power management chip U1 meeting control system is filled to rechargeable battery 100 Powering load while electric；If current value VRCS > 6.5mV needed for loading, power management chip U1 meeting control system are preferential It supplies electricity to load, while being gradually reduced charging current until not charging, allow and fully enter electric current supply load, while having reached defeated Enter the effect of current limliting, if VRCS < 5.5mV, power management chip U1, which can be controlled, restores the charging of rechargeable battery 100.Work as movement When power source charges, short-press key, power management chip U1 can control charge closing, open simultaneously output USB5V/3A electric discharge port 3, detected whether load, such as grafting robot module for needing electricity consumption etc., connect USB5V/3A discharge port 3, if there is It then preferentially powers to it, if not provided, restoring to charge to rechargeable battery 100 after 15s.

Power source charges port 4 is connected to the input power detection pin VIN of power management chip U1, when mobile power source starts to fill When electric, the rectification of hardware metal-oxide-semiconductor is controlled by control NMOS tube hardware controls pin NGATE, PMOS tube hardware controls pin PGATE Circuit, which is realized, controls the charged state of rechargeable battery 100.It is realized by anode pin BAT to rechargeable battery 100 Preliminary protective effect is played in the detection of voltage and current.It is realized by closing USB output pin CTR to USB5V/3A discharge end Second metal-oxide-semiconductor Q2 of 3 cathode of mouth is controlled, and disconnects this when needing to stop electric discharge.Control pin is filled by counnter attack The first metal-oxide-semiconductor Q1 that REVCTR controls power source charges port 4 to USB5V/3A electric discharge port 3 realizes that counnter attack fills function, works as output When connecing load, the first metal-oxide-semiconductor Q1 of opening may be implemented external power supply and directly be powered to load, if detecting that load has electricity Stream is anti-to fill phenomenon, then needs to disconnect the first metal-oxide-semiconductor Q1 immediately.Charge condition is shown by four LED lights 2.

As shown in figure 5, circuit protection unit includes circuit protection chip U4, N-channel MOS fet chip U5, the 7th resistance R7, the tenth capacitor C10, the 11st capacitor C11 and battery BT1, wherein model XB8886A can be used in circuit protection chip U4 Chip realize, N-channel MOS fet chip U5 can be used model 8205A chip realize.

After 4 negative pin VM connections of circuit protection chip U4, it is connect with the cathode P- of third port P3；Circuit protection The positive BAT+ of the energization pins VDD and battery BT1 of chip U4 are connect, and are connected to the positive P+ of third port P3；Circuit is protected It is connect after protecting 3 grounding pin GND connections of chip U4 with the cathode BAT- of battery BT1.Battery BT1, that is, aforementioned chargeable electricity Pond 100.The positive BAT+ of battery BT1 also passes through concatenated 7th resistance R7 and the 11st capacitor C11 and is connected to the negative of battery BT1 Pole BAT-.

The first grid pin G1 and second grid pin G2 of N-channel MOS fet chip U5 and the cathode P- of third port P3 It connects, and is connected to the first source lead S1 of N-channel MOS fet chip U5 by the tenth capacitor C10.N-channel MOS fet chip The the first drain lead D12 and the second drain lead D21 of U5 is connected.The second source lead S2 of N-channel MOS fet chip U5 connects Meet the closing USB output pin CTR of power management chip U1.

There are three parameter settings for over-charging of battery protection, first is that over-charging of battery detection voltage (VCU), delay time (tCU), electricity Pond overcharge releases voltage (VCL).

Voltage is detected when the voltage of rechargeable battery 100 is higher than the over-charging of battery under normal condition, and in this case Duration reach delay time or it is longer when, circuit protection chip U4 will be such that internal MOSFET closes, and being interrupted with this can fill The connection of battery 100 cathode and charging terminal reaches interruption charging.

For system there are two types of reset mode, the first reset mode is when the voltage of rechargeable battery 100 is down to over-charging of battery When electrolysis is except below voltage, circuit protection chip U4 controls its internal MOSFET and opens so that it restores normal chargeable state. Under this form, the value of VCU is higher than the value of VCL, one schmidt trigger form of one high and one low composition, to stay to two states There is certain threshold space, prevents abnormal switching state.Ensure the stability of system.For example, settable VCU is 5.7V, and VCL is set as 4.9V.If filling the automatic breaking inner MOSFET of system when reaching 5.7V when then charging for a long time, stop charging. When artificially disconnecting mobile power source, when rechargeable battery 100 discharges into 4.9V, it is just restored to chargeable state.At this time in 4.9- It is not chargeable when 5.7V, one section of threshold interval is provided with this.

Second of reset mode is to turn on load, only voltage is needed to be down to VCU or less at this time.Because having had at this time It is supported on consumption electricity, it is possible to allow it that can enter chargeable state when over-charging of battery detects voltage or less.Release Mechanism is as follows: discharge current flows through the endophyte diode of MOSFET inside circuit protection chip U4 immediately after load connection And start to discharge, and the negative pin VM voltage of circuit protection chip U4 from grounding pin GND increase about 0.7V (diode Forward voltage) instantaneous voltage.Circuit protection chip U4 detects the voltage and discharges overcharge situation.Therefore, in chargeable electricity The voltage in pond 100 is equal to or less than in the case where overcharging electro-detection voltage, and circuit protection chip U4 can recover immediately normal condition, But in the case where rechargeable battery 100 is higher than and overcharges electro-detection voltage, even if connection load, overcharged until cell voltage is lower than When electro-detection voltage, chip can just restore normal condition.In addition, when connection loads and starts electric discharge, if negative pin VM Terminal voltage is equal to or less than overcurrent and detects voltage, then chip does not return to normal condition.

If negative pin VM voltage is equal to or less than short-circuit protection voltage (Vshort), circuit protection chip U4 will make Internal MOSFET is disconnected, and disconnects rechargeable battery 100 and power source charges port 4.The maximum delay time of closing is Tshort. When negative pin VM voltage is higher than short-circuit protection voltage (Vshort) (such as when short-circuit source removing), this state will be released. Such as when 4 short circuit of power source charges port, negative pin VM detects voltage instantaneous down to 0V, will lead to internal moment disconnection at this time Connection.

With this, needing to guarantee to discharge every time, it is too low to discharge, and it is not chargeable not so to will lead to 100 entrance of rechargeable battery State.So needing to have over-discharge detection in USB5V/3A electric discharge port 3, this is also that children must increased function using power supply.

When the voltage of rechargeable battery 100 is lower than over-discharge electro-detection voltage, and the duration reaches discharge examination and prolongs Slow time or longer time, circuit protection chip U4 will close internal MOSFET, disconnect it and connect with the external world.Such case is known as Over-discharge state.After internal MOSFET shutdown, negative pin VM is by the negative pin VM and energization pins of circuit protection chip U4 Resistance RVMD pull-up between VDD.Under the conditions of overdischarge, negative pin VM and energization pins VDD are by IC (integrated circuit) Resistance RVMD short circuit.When mobile power source connects extraneous power supply, and the potential difference between negative pin VM and energization pins VDD When becoming 1.3V (representative value) or higher (load short circuits detection voltage), outage condition is released.At this point, inside MOSFET is still closed It closes.When the voltage of rechargeable battery 100 becomes over-discharge electro-detection voltage (VDL) or higher, circuit protection chip U4 will be opened Internal MOSFET is simultaneously transformed into normal condition from over-discharge state.Battery Cross prevention can effectively prevent children from using movement Power supply is excessive.

Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations； Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc. With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution The spirit and scope of scheme.

Claims (10)

1. a kind of children's science and education toy mobile power source characterized by comprising rechargeable battery, battery circuit, shell and at least One tenon；

In the enclosure interior, the shell is equipped with power switch, electricity for the rechargeable battery and battery circuit setting Source charging port and USB5V/3A electric discharge port；

The battery circuit includes circuit protection unit and Power Management Unit, the rechargeable battery and the circuit protection list Member connection, the circuit protection unit connect with the Power Management Unit, the Power Management Unit respectively with the power supply Switch, the power source charges port and USB5V/3A electric discharge port electrical connection；

At least one tenon setting is in the hull outside, and for being cooperatively connected with mortise, the tenon includes tenon master Body and the multiple cambered surfaces being arranged on the outside of tenon main body protrusion, the cross section of each cambered surface protrusion are arc, and institute The length direction for stating cambered surface protrusion is arranged along the plug orientation of the tenon, and the tenon main body passes through the cambered surface protrusion and institute State mortise contact connectio.

2. children's science and education toy mobile power source according to claim 1, it is characterised in that: the Power Management Unit includes Power management chip, double P-channel MOSFET chips and double N-channel MOS fet chips, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, inductance, One capacitor to the 9th capacitor, first resistor to the 6th resistance and the first light emitting diode to the 4th light emitting diode；

After power source charges port is in parallel with the 4th capacitor, the input power detection pin connection of one end and power management chip, separately One termination signal ground；The anode of power source charges port is additionally coupled to the drain electrode of the first metal-oxide-semiconductor；The source electrode of first metal-oxide-semiconductor is connected to The chip system power pins of power management chip, the source electrode of the first metal-oxide-semiconductor also pass through first capacitor in parallel, the second capacitor and Third capacitance connection signal ground；The counnter attack that the grid of first metal-oxide-semiconductor is connected to power management chip fills control pin；

The chip system power pins of power management chip the first source lead and second with double P-channel MOSFET chips simultaneously Source lead connection；After the first grid pin of double P-channel MOSFET chips is connected with second grid pin, with power management core The PMOS tube hardware controls pin of piece connects；First drain lead of double P-channel MOSFET chips to the 4th drain lead connects It is connect afterwards with the first end of inductance；The second end of inductance is by being connected to circuit protection after third capacitor and the 4th capacitor in parallel The anode of unit；The second end of inductance is also connect with the high-side current of power management chip sampling pin, power management chip Anode pin is connected to the anode of circuit protection unit；Circuit protection list is connected to after 8th capacitor and the 9th capacitor are in parallel Between the anode and signal ground of member；

First drain lead of double N-channel MOS fet chips to the 4th drain lead and the first end of inductance connects, double N-channels First source lead of MOSFET chip is connected with the second source lead is followed by signal ground；The first of double N-channel MOS fet chips It is connect after gate lead and the connection of second grid pin with the NMOS tube hardware controls pin of power management chip；

It is connected between the push button signalling input pin of power management chip and signal ground after power switch is in parallel with the 7th capacitor；

After USB5V/3A electric discharge port is in parallel with the 5th capacitor, the chip system power pins of one end and power management chip connect It connects, the drain electrode of the second metal-oxide-semiconductor of another termination；The grid and source electrode of second metal-oxide-semiconductor pass through the 6th capacitance connection, and the second metal-oxide-semiconductor Grid connection power management chip closing USB output pin；The electric current of the source electrode connection power management chip of second metal-oxide-semiconductor Detect pin anode；The current detecting pin anode of power management chip connects signal by the 5th resistance and the 6th resistance in parallel Ground.

3. children's science and education toy mobile power source according to claim 2, it is characterised in that: the circuit protection unit includes Circuit protection chip, N-channel MOS fet chip, the 7th resistance, the tenth capacitor, the 11st capacitor and rechargeable battery；

After 4 negative pins connection of circuit protection chip, it is connect with the cathode of circuit protection unit；The confession of circuit protection chip The anode of electric pin and rechargeable battery connects, and is connected to the anode of circuit protection unit；3 ground connection of circuit protection chip It is connect after pin connection with the cathode of rechargeable battery；The anode of rechargeable battery also passes through concatenated 7th resistance and the 11st Capacitance connection to rechargeable battery cathode；

The first grid pin and second grid pin of N-channel MOS fet chip and the cathode of circuit protection unit connect, and lead to Cross the first source lead of the tenth capacitance connection to N-channel MOS fet chip；First drain lead of N-channel MOS fet chip and Second drain lead is connected；The closing USB output of the second source lead connection power management chip of N-channel MOS fet chip is drawn Foot.

4. children's science and education toy mobile power source according to claim 1, it is characterised in that: the shell is also embedded with 4 LED light, 4 LED lights are electrically connected with the Power Management Unit, for showing the rechargeable battery Remaining capacity.

5. children's science and education toy mobile power source according to claim 4, it is characterised in that: further include at least one with it is described The mortise that tenon matches；The shell is rectangle, and the power switch and 4 LED lights are arranged in the shell Body front, the power source charges port and USB5V/3A electric discharge port are arranged at the housing side, the tenon and the fourth of the twelve Earthly Branches Hole is arranged at the back side of shell.

6. children's science and education toy mobile power source according to claim 1, it is characterised in that: the tenon main body is hollow knot Structure.

7. children's science and education toy mobile power source according to claim 6, it is characterised in that: the inner wall of the tenon main body and The cross section of outer wall is square, and is all provided with that there are two cambered surface protrusions on each side of the tenon main body, or

The cambered surface protrusion is equipped on each angle of the tenon main body.

8. children's science and education toy mobile power source according to claim 7, it is characterised in that: the length of the cambered surface protrusion with The equal length of the tenon main body, and setting spaced in parallel to each other.

9. children's science and education toy mobile power source according to claim 8, it is characterised in that: the tenon is 90 ° of rotations pair Claim structure.

10. children's science and education toy mobile power source according to claim 9, it is characterised in that: the height of the cambered surface protrusion Not less than 1/5th of the tenon body width, no more than the one third of the tenon body width.