CN201966457U - Socket charging for storage battery - Google Patents

Abstract

The utility model provides a battery charging socket, which comprises: a battery charging jack, an external socket power plug, a battery charging current detection circuit, an automatic power-off control circuit, a relay driving circuit and a charging current detection circuit for the battery. circuit, an automatic power-off control circuit, and a power supply circuit powered by a relay drive circuit; the battery charging current detection circuit outputs a corresponding level to the sampling input terminal of the automatic power-off control circuit when the battery charging jack is inserted into a battery , the automatic power-off control circuit outputs a control level to the drive input port of the relay drive circuit through the drive output port. By adopting the utility model, the power supply can be cut off intelligently when the battery is fully charged.

Description

battery charging socket

technical field

The utility model relates to the technical field of electrical appliances, in particular to a storage battery charging socket.

Background technique

At present, there are mainly two types of charging sockets that are widely used:

(1), Ordinary power socket:

The common power socket is composed of a face cover, a bottom cover, a base, a circuit board and the like. Wherein, there is a power cord access hole at the bottom of the base, and the external power cord is connected to the power input end of the circuit board through the power cord access hole at the bottom.

(2), charging socket:

The charging socket includes an insulating base body, terminals accommodated in the insulating base body and a shielding body. Wherein, a first terminal seat and a second terminal seat are provided on the insulating seat body, and there is an insertion space between the two terminal seats, and openings are respectively provided on the two terminal seats opposite to the insertion space; The first and second terminal bases are framed around the base body.

Though above-mentioned two kinds of sockets can realize charging function, do not possess self-learning function, can't judge the state of charge of rechargeable battery, can't intelligently cut off the power supply under the situation that storage battery is fully charged.

Utility model content

The utility model provides a storage battery charging socket so as to intelligently cut off the power supply when the battery is fully charged.

The technical scheme provided by the utility model includes:

A battery charging socket, comprising: a battery charging jack, an external socket power plug, a battery charging current detection circuit, an automatic power-off control circuit, a relay drive circuit, and a power supply circuit; the power supply circuit is the battery charging current detection circuit, The automatic power-off control circuit and the relay drive circuit supply power, and the battery charging current detection circuit outputs a level to the sampling input terminal of the automatic power-off control circuit when the battery charging jack is inserted into the battery, and the automatic power-off The control circuit outputs the control level to the drive input port of the relay drive circuit through the drive output port;

Wherein, the power supply circuit includes a power transformer, one end of the primary coil in the power transformer is connected to one of the external socket power plugs, and the other end is connected to the normally open contact of the relay in the relay driving circuit; the battery charging current detection The circuit includes a current transformer, one end of the primary coil in the current transformer is connected to the normally open contact of the relay in the relay driving circuit, and the other end is connected to the power plug of one of the external sockets through the battery charging jack;

The common contacts of the relays in the relay driving circuit are connected to the power plug of another external socket.

It can be seen from the above technical scheme that in the utility model, the automatic power-off control circuit outputs the control level to the drive input port of the relay drive circuit through the drive output port, and the relay drive circuit controls the normally open state of the relay according to the control level. Whether the contact is connected to the socket power supply, when the socket power supply is connected, the socket power supply will continue to charge the battery, and when the socket power supply is not connected, the socket power supply will no longer charge the battery, which can realize the self-learning function of the battery charging socket , It can intelligently cut off the power supply when the battery is fully charged, effectively avoid fire hazards and electrical failures, and maximize the service life of the battery.

Description of drawings

Fig. 1 is the structural diagram of the storage battery charging socket provided by the utility model;

Fig. 2 is the schematic diagram of the circuit structure of the power supply circuit provided by the utility model;

Fig. 3 is the schematic diagram of the circuit structure of the storage battery charging current detection circuit provided by the utility model;

Fig. 4 is the schematic diagram of the circuit structure of the utility model automatic power-off control circuit;

Fig. 5 is the schematic diagram of the circuit structure of the relay driving circuit provided by the utility model

Fig. 6 is a schematic diagram of the circuit structure of the battery charging socket provided by the present invention.

Detailed ways

The storage battery charging socket provided by the utility model is suitable for various existing storage battery chargers, which can intelligently charge the storage battery and intelligently memorize the fully charged state of the storage battery, so as to fully charge the storage battery when no one is watching it. Automatic power off, effectively avoid fire hazards and electrical failures, and maximize the service life of the battery.

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The battery charging socket provided by the utility model includes: a battery charging jack and an external socket power plug, wherein the battery charging jack is used to connect the battery, and the external socket power tap is used to connect the battery charging socket provided by the utility model to the socket power supply .

Preferably, as shown in FIG. 1 , the battery charging socket may further include: a power supply circuit, a battery charging current detection circuit, an automatic power-off control circuit and a relay driving circuit.

Wherein, during application, the battery charging jack, the power supply circuit, the battery charging current detection circuit, the automatic power-off control circuit and the relay driving circuit can be arranged in the casing, and an external socket power plug can be arranged on the casing.

In this embodiment, the power supply circuit is powered by the battery charging current detection circuit, the automatic power-off control circuit, and the relay drive circuit, that is, the power supply circuit is connected with the battery charge current detection circuit, the automatic power-off control circuit, and the relay drive circuit. When the battery charging jack is inserted into the battery, the current detection circuit outputs the corresponding level to the sampling input terminal of the automatic power-off control circuit, and the automatic power-off control circuit outputs the control level to the relay drive through the drive output port The drive input port of the circuit. In this way, the relay driving circuit controls whether to continue charging the storage battery according to the received control level. The storage battery charging socket provided by the utility model is described in detail below.

Referring to Fig. 2, Fig. 2 is a schematic structural diagram of the power supply circuit provided by the present invention. The utility model takes the power supply circuit as an example of a 5 volt direct current power supply circuit, and the principles of other situations are similar. As shown in FIG. 2, the power supply circuit may include: a power transformer T1, a rectifier bridge D1, a 5-volt regulator WDZ and a filter electrolytic capacitor C1.

In Fig. 2, one end of the primary coil in the power transformer T1 (denoted as terminal 1) is connected to one of the plugs (denoted as plug 1) of the external socket power supply (which is used to provide a voltage of 220V), and the other end (denoted as The connection of terminal 2) will be described in the description of the relay drive circuit, and will not be repeated here.

The secondary coil of the power transformer T1 is connected to the input terminal of the rectifier bridge D1.

The 5-volt regulator tube WDZ is connected between the output ends of the rectifier bridge D1, specifically connected in parallel between the output ends of the rectifier bridge D1.

The filter electrolytic capacitor C1 is connected in parallel to the two ends of the 5-volt voltage regulator WDZ, and is used to average the AC voltage to a DC level.

In this embodiment, the output end of the 5-volt regulator tube WDZ is used as the output end of the power supply circuit, which outputs the averaged DC level obtained by the filter electrolytic capacitor C1 to the battery charging current detection circuit, automatic power-off control circuit and relay drive circuit.

So far, the description of the power supply circuit is completed, and the circuit structure of the battery charging current detection circuit will be described below.

Referring to FIG. 3 , FIG. 3 is a schematic diagram of the circuit structure of the battery charging current detection circuit provided by the utility model. As shown in Figure 3, the battery charging current detection circuit includes a current transformer T2, a sampling resistor R2, a proportional amplifier, a load resistor R4, a rectifier diode D2 and a filter electrolytic capacitor C6.

In Fig. 3, one end of the primary coil in the current transformer T2 (denoted as the first end) is connected to one end of the battery charging jack, and the other end of the battery charging jack is connected to the plug 1, as for the other end of the current transformer T2 (denoted as The connection of the second terminal) will be described when describing the relay drive circuit, and will not be described here.

One end of the secondary coil in the current transformer T2 is grounded, and the other end is connected to the sampling resistor R2 and the input end of the proportional amplifier.

In this embodiment, the proportional amplifier is composed of resistors R1, R3, capacitors C4, C5 and an operational amplifier, and its input terminal is the non-inverting terminal of the operational amplifier, that is, pin 3.

The voltage terminal of the operational amplifier is connected to the output terminal of the power supply circuit (specifically, the output terminal of the 5V voltage regulator tube WDZ in Figure 2) and the capacitor C5, and the output terminal, that is, pin 1 is connected to the load resistor R4 and one end of the rectifier diode D2. It can be seen that, In Figure 3, one end of the rectifier diode is connected to the output terminal of the operational amplifier. As for the inverting terminal of the operational amplifier, it is connected to resistors R1, R3 and capacitor C4. Among them, capacitors C4 and C5 are used for high-frequency suppression, and resistors R1 and R3 are Scaling resistor used to determine the gain of the operational amplifier. In this embodiment, the model of the operational amplifier may be LM358A in actual implementation.

One end of the filter electrolytic capacitor C6 is connected to the other end of the rectifier diode D2 as the output end of the battery charging current detection circuit for outputting the level to the sampling input end of the automatic power-off control circuit, and the other end of the filter electrolytic capacitor C6 One end is grounded.

So far, the description of the battery charging current detection circuit has been completed, and the circuit structure of the automatic power-off control circuit will be described below.

Referring to FIG. 4, FIG. 4 is a schematic diagram of the circuit structure of the automatic power-off control circuit. As shown in Figure 4,

The automatic power-off control circuit may comprise a single-chip microcomputer and peripheral circuits.

Wherein, the single-chip microcomputer may adopt a single-chip microcomputer model of PIC12F675 or other single-chip microcomputers during specific implementation, which is not specifically limited in this embodiment.

Taking the single-chip microcomputer model PIC12F675 as an example, one power supply end of the single-chip microcomputer PIC12F675, namely, the VDD end, is connected to the output end of the power supply circuit (specifically, the output end of the 5V regulator tube WDZ), and the other end, namely, the Vss end, is grounded.

The input end of the single-chip microcomputer PIC12F675, that is, the GP2 end, is the sampling input end of the automatic power-off control circuit, and the output end, that is, the GP1 end, is the drive output port of the automatic power-off control circuit.

The peripheral circuits in the automatic power-off control circuit mainly include capacitors C8, C7, and resistors R5 to R8. Among them, the capacitor C8 is connected in parallel between the power supply terminals of the single chip microcomputer, and is used for high-frequency filtering of the voltage of the single chip microcomputer; the resistor R5 and the capacitor C7 are connected to the power-on reset port of the single chip microcomputer, that is, the GP3 terminal, and the resistor R6 is connected to the GP4 terminal of the single chip microcomputer; the resistor R7 One end of the resistor R8 is connected to the display port of the single-chip microcomputer, that is, the GP5 end; the resistance R8 is connected to the learning port of the single-chip microcomputer.

Preferably, in this embodiment, the automatic power-off control circuit also includes a charging status indicator light and a learning button;

Wherein, the charging state indicator LED is connected to the display port of the single-chip microcomputer, specifically, one end is connected to the display port of the single-chip microcomputer through a resistor R7, and the other end is grounded, which is used to identify whether the state of the storage battery is a charging state or an overcharged state; for example, in When the display port (GP5) outputs the first level, the charging status indicator LED indicates that the battery is in the charging state, and when the display port (GP5) outputs the first level, the charging status indicator LED indicates that the battery is in the overcharged state.

One end of the learning button S2 is grounded, and the other end is connected to the learning port of the single-chip microcomputer, that is, the GP0 end and the resistor R8. Press; when the learning port, that is, the GP0 end, detects that the learning button is turned on, it stores the current sampling level of the sampling input end. Preferably, the A/D converter and 4M crystal oscillator are built-in at the sampling input end of the single-chip microcomputer, which is used to perform A/D conversion on the DC level output by the battery charging current detection circuit, and store the converted DC level. Therefore, this The level stored at the time is the level after A/D conversion, which is generally stored in the EEPROM of the single-chip microcomputer, and is used as a basis for judging whether the battery is overcharged.

Among them, the operation of judging whether the battery is overcharged by using the level stored in the EEPROM specifically includes: when the input terminal of the single-chip microcomputer samples the level output by the battery charging current detection circuit, it will compare the level obtained by the sampling with the level stored in the EEPROM of the single-chip microcomputer. The level of the storage battery in the fully charged state controls the display state of the charging status indicator LED according to the comparison result, and outputs the control level corresponding to the comparison result to the relay drive circuit. Preferably, in this embodiment, when the DC level output by the battery charging current detection circuit is sampled higher than the DC level stored in the EEPROM when the battery is fully charged, the charging status indicator LED is controlled to indicate the charging status, and the output is driven The port outputs a high level to the relay drive circuit; otherwise, control the charging status indicator LED to indicate the overcharge state, and output a low level to the relay drive circuit through the drive output port.

So far, the description of the circuit structure of the automatic power-off control circuit has been completed.

Referring to Fig. 5, Fig. 5 is a schematic diagram of the circuit structure of the relay driving circuit provided by the present invention. As shown in Figure 5, the relay drive circuit includes a relay K1, a control button S1, a transistor Q1 and a rectifier diode D6;

Among them, the base of the transistor Q1 is the drive input port of the relay drive circuit, which is connected to the drive output port of the automatic power-off control circuit, specifically connected to the drive output port of the automatic power-off control circuit through the current limiting resistor R9, and the emitter is grounded , the collector is connected to one end of the coil in the relay K1;

In this embodiment, the other end of the coil in the relay K1 is connected to the power supply circuit, specifically to the output terminal of the 5V regulator WDZ in the power supply circuit;

The normally open contact of the relay K1 is connected to the terminal 2 of the power transformer T1 in the power supply circuit and the second terminal of the current transformer T2 in the battery charging current detection circuit, and the common contact is connected to the power plug of another external socket (recorded as different from the plug 1 The tap 2) of the normally closed contact is virtual connected;

The control button S1 is connected in parallel between the normally open contact and the common contact of the relay, when the battery charging socket is initially started, the control button is pressed to make all the circuits in the battery charging socket work normally;

The rectifier diode D6 is connected to both ends of the coil of the relay K1. The purpose of connecting the rectifier diode D6 at both ends of the coil of the relay K1 is to provide a loop for the current in the coil of the relay K1 after the transistor Q1 is cut off, so as to avoid the coil Excessive induction potential damages the triode.

In the application of this embodiment, first insert a fully charged battery into the battery charging jack in the battery charging socket, then press the control button S1 to make each circuit of the battery charging socket start to work, and then press the learning button S2, by The single-chip microcomputer in the automatic power-off control circuit samples and stores the output level of the battery charging current detection circuit to the EEPROM of the single-chip microcomputer as a basis for subsequent judgment of whether the battery is overcharged.

Afterwards, when the battery is inserted into the battery charging jack, if the various circuits in the battery charging socket work normally, when the sampling input terminal of the microcontroller samples the DC level output by the output terminal of the battery charging current detection circuit, the sampled output will be compared. DC level and the level stored in the EEPROM when the battery is fully charged. If the battery is charged but not fully charged, there will be a large charging current in the induction coil of the current transformer. At this time, the sampled The DC level of the battery will be higher than the DC level of the storage battery when it is fully charged. Therefore, the result of the comparison at this time is that the DC level obtained by sampling is higher than the DC level of the battery when it is fully charged. Afterwards, the drive output port of the automatic power-off control circuit (that is, the output terminal of the single-chip microcomputer, that is, the GP1 terminal) outputs a high level, and the high level of the output passes through the current limiting resistor R9 to the base of the transistor Q1 (that is, the relay drive circuit At this time, the triode Q1 is turned on, and one end of the coil of the relay K1 connected to the collector is energized. In this way, the normally open contact of the relay K1 is closed to connect the battery charging socket power supply, and the socket power supply continues to charge the battery Charge. Conversely, when the DC level obtained by sampling is lower than or equal to the DC level when the storage battery is fully charged, the drive output port of the automatic power-off control circuit (that is, the output terminal of the single-chip microcomputer, that is, the GP1 terminal) outputs a low level, and the output The low level of the transistor Q1 passes through the current-limiting resistor R9 to the base of the transistor Q1 (that is, the drive input port of the relay drive circuit), the transistor Q1 is cut off, the coil of the relay K1 connected to the collector loses power, and the power supply of the battery charging socket is automatically disconnected. The outlet power is prevented from charging the battery. In this way, the power supply can be cut off intelligently when the storage battery is fully charged.

Combining the circuit structures shown in Fig. 1 to Fig. 5, a specific circuit schematic diagram of the battery charging socket provided by the utility model as shown in Fig. 6 can be obtained.

So far, the description of the battery charging socket provided by the utility model is completed.

It can be seen from the above technical scheme that in the utility model, the automatic power-off control circuit outputs the control level to the drive input port of the relay drive circuit through the drive output port, and the relay drive circuit controls the normally open state of the relay according to the control level. Whether the contact is connected to the socket power supply, when the socket power supply is connected, the socket power supply will continue to charge the battery, and when the socket power supply is not connected, the socket power supply will no longer charge the battery, which can realize the self-learning function of the battery charging socket , It can intelligently cut off the power supply when the battery is fully charged, effectively avoid fire hazards and electrical failures, and maximize the service life of the battery.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present utility model shall include Within the protection scope of the utility model.

Claims (10)

1. A battery charging receptacle, the receptacle comprising: the device comprises a storage battery charging jack, an external socket power plug, a storage battery charging current detection circuit, an automatic power-off control circuit, a relay drive circuit and a power supply circuit; the power supply circuit supplies power to the storage battery charging current detection circuit, the automatic power-off control circuit and the relay drive circuit, the storage battery charging current detection circuit outputs a level to the sampling input end of the automatic power-off control circuit when the storage battery charging jack is inserted into the storage battery, and the automatic power-off control circuit outputs a control level to the drive input end of the relay drive circuit through the drive output port;

the power supply circuit comprises a power transformer, wherein one end of a primary coil in the power transformer is connected with one external socket power plug, and the other end of the primary coil is connected with a normally open contact of a relay in the relay driving circuit; the storage battery charging current detection circuit comprises a current transformer, one end of a primary coil in the current transformer is connected with a normally open contact of a relay of the relay driving circuit, and the other end of the primary coil is connected with one external socket power plug through the storage battery charging jack;

and the common contact of the relay in the relay driving circuit is connected with another external socket power plug.

2. The battery charging receptacle of claim 1, wherein the power supply circuit further comprises: the rectifier bridge, the voltage regulator tube and the first capacitor; wherein,

the input end of the rectifier bridge is connected with a secondary coil of the power transformer;

the voltage-stabilizing tube is connected between the output ends of the rectifier bridge in parallel;

the first capacitor is connected in parallel at two ends of the voltage-stabilizing tube.

3. The battery-charging receptacle according to claim 2, wherein the power supply circuit is a 5 volt dc power supply circuit and the voltage regulator is a 5 volt voltage regulator WDZ.

4. The battery charging socket of claim 1, wherein said battery charging current detection circuit further comprises: the sampling resistor, the proportional amplifier comprising an operational amplifier, a first rectifier diode and a second capacitor; wherein,

one end of the sampling resistor is connected with one end of a secondary coil in the current transformer and the in-phase end of an operational amplifier in the proportional amplifier, and the other end of the sampling resistor is grounded; the other end of a secondary coil in the current transformer is grounded;

one end of the second capacitor is connected with one end of the first rectifier diode, serves as the output end of the storage battery charging current detection circuit and is used for outputting a level to the sampling input end of the automatic power-off control circuit, and the other end of the second capacitor is grounded;

the other end of the first rectifying diode is connected with the output end of the operational amplifier.

5. The battery charging socket as recited in claim 4, wherein the operational amplifier is model number LM 358A.

6. The battery charging receptacle of claim 1, wherein the automatic power-off control circuit comprises a single-chip microcomputer, wherein,

the input end of the single chip microcomputer is the sampling input end of the automatic power-off control circuit, and the output end of the single chip microcomputer is the driving output end of the automatic power-off control circuit.

7. The battery charging receptacle of claim 6, wherein the auto-power-off control circuit further comprises a learn button;

the learning button is connected with a learning port of the single chip microcomputer and is connected when the storage battery charging jack is inserted into a fully charged storage battery;

and the learning port of the singlechip is used for storing the current sampled level of the sampling input end when the learning button is detected to be switched on.

8. The battery charging receptacle of claim 6, wherein the automatic power-off control circuit further comprises a state-of-charge indicator light for indicating whether the battery is in a state-of-charge or an overcharged state;

the charging state indicator light is connected with a display port of the single chip microcomputer.

9. The battery charging socket according to any one of claims 6 to 8, wherein the type of the single chip microcomputer is PIC12F 675.

10. The battery charging jack of claim 1, wherein the relay drive circuit further comprises: a control button, a triode, and a second rectifying diode, wherein,

the control button is connected between the normally open contact and the common contact of the relay in parallel;

the collector of the triode is connected with one end of the coil in the relay, and the other end of the coil in the relay is connected with the power supply circuit; the base electrode of the triode is connected with the driving output port of the automatic power-off control circuit, and the emitting electrode is grounded;

the second rectifier diode is connected to two ends of the coil of the relay.

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