CN212162899U - Overcharge protection circuit and overcharge protection charger - Google Patents

Overcharge protection circuit and overcharge protection charger Download PDF

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Publication number
CN212162899U
CN212162899U CN202021005865.4U CN202021005865U CN212162899U CN 212162899 U CN212162899 U CN 212162899U CN 202021005865 U CN202021005865 U CN 202021005865U CN 212162899 U CN212162899 U CN 212162899U
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circuit
pin
chip
output
resistor
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CN202021005865.4U
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李建军
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Shenzhen Huajin Electronics Co ltd
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Shenzhen Huajin Electronics Co ltd
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Abstract

The utility model discloses an overcharge protection circuit, a serial communication port, include: the connection port is used for accessing a power supply; the charging circuit comprises a charging circuit input end and a charging current output end, and is used for carrying out voltage reduction and current stabilization processing on the power supply and then outputting the power supply; the sampling circuit comprises a sampling circuit input end and a sampling circuit output end, wherein the sampling circuit input end is connected with the charging circuit output end and is used for outputting a sampling current signal and a sampling voltage signal according to the output current and the output voltage of the charging circuit; the control circuit is used for outputting a first control signal to control the charging circuit to stop charging the charging equipment when the sampling current signal is located in a preset current range.

Description

Overcharge protection circuit and overcharge protection charger
Technical Field
The utility model relates to a battery charging field, in particular to overcharge protection circuit and overcharge protection charger.
Background
Most chargers on the market currently continue to be in an over-current state after charging the battery, and if the battery cannot be disconnected in time by a user, the over-charging risk may be caused to the battery, so that the battery is damaged to a certain extent.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an overcharge protection circuit aims at solving the problem that can not the auto-power-off after the battery is full of.
In order to achieve the above object, the utility model provides an overcharge protection circuit includes: the input port is used for accessing a power supply;
an output port for connection with a battery;
the charging circuit comprises an input end, an output end detection end and a feedback signal input end, the input end of the charging circuit is connected with the input port, and the output end of the charging circuit is connected with the output port and used for outputting the power supply after voltage reduction and current stabilization processing;
the input end of the sampling circuit is connected with the detection end of the charging circuit and used for outputting a sampling signal according to the output current of the charging circuit;
the control circuit is provided with a detection end, a display signal output end and a feedback signal output end, the detection end of the control circuit is connected with the output end of the sampling circuit, the feedback signal output end of the control circuit is electrically connected with the feedback signal input end of the charging circuit, and the control circuit is used for outputting a display signal according to the sampling signal and outputting a first control signal to control the charging circuit to stop charging the battery when the sampling signal is smaller than a preset current value;
and the display signal output end of the control circuit is connected with the input end of the display screen and is used for displaying the output current value of the charging circuit according to the display signal.
Optionally, the sampling circuit includes a first resistor, a first end of the first resistor is an input end of the sampling circuit, and a second end of the first resistor is an output end of the sampling circuit.
Optionally, the control circuit includes a first chip, the pin 5 of the first chip is connected to the output end of the charging circuit, the pin 6 of the first chip is the detection end of the control circuit, the pin 6 is connected to the second end of the first resistor, the pin 2 and the pin 4 of the first chip are the feedback signal output end of the control circuit, the pin 2 and the pin 4 of the first chip are connected to the feedback signal input end of the charging circuit, and when the pin 6 of the first chip receives that the sampling signal is smaller than the preset value, the pin 2 and the pin 4 of the first chip output a first control signal to control the charging circuit to stop charging the battery.
Optionally, the control circuit is provided with a first photoelectric coupler, the output end of the first photoelectric coupler light emitter is connected with the first chip pin 2, two parallel capacitors are arranged between the pin 2 and the pin 4 of the first chip, the control circuit further comprises a second chip, the second chip is provided with a feedback pin 3, a light receiver of the photoelectric coupler is connected with the feedback pin 3 of the second chip, the second chip is further provided with 5 pins, the pin 5 of the second chip is provided with a double-drain open circuit, and the double-drain open circuit pin is connected with the input end of the charging circuit.
Optionally, the sampling circuit still includes second resistance, third resistance and second optoelectronic coupler, the second resistance with third resistance parallel connection, the first end after the parallelly connected of second resistance and third resistance with charging circuit's output is connected, the second end after the parallelly connected of second resistance and third resistance with the input of second optoelectronic coupler is connected, the output of second optoelectronic coupler with pin 8 of first chip is connected, pin 8 of first chip with the display screen is connected.
Optionally, the charging circuit further includes a rectifying module, a transforming module, a filtering module and an anti-interference module, the input end of the rectifying module is connected to the input end of the charging circuit, the transforming module includes a primary coil and a secondary coil, one end of the primary coil is connected to the output end of the rectifying module, the other end of the primary coil is connected to the open-circuit pin 5 of the drain electrode of the second chip, the input end of the filtering module is connected to the secondary coil, the input end of the anti-interference module is connected to the output end of the filtering module, and the output end of the anti-interference module is connected to the output end of the charging circuit.
Optionally, the charging circuit still includes fourth resistance, third photoelectric coupler, the one end of fourth resistance is connected charging circuit's output, the other end of fourth resistance is connected the input of third photoelectric coupler, the output of third photoelectric coupler with the stitch 1 of first chip is connected, the stitch 1 of first chip with the display screen is connected.
The utility model discloses still provide an overcharge protection charger, overcharge protection charger includes that any one of the aforesaid overcharges protection circuit.
The utility model discloses technical scheme is right through sampling circuit charging circuit's output current samples to output sampling signal to control circuit, control circuit makes corresponding control command according to sampling signal, when user's battery or battery charging outfit are in full charge state, the sampling signal of sampling circuit's output is less than control circuit's default, control circuit makes the instruction and feeds back this instruction to charging circuit this moment, and then stops to charge for the battery, and simultaneously, control circuit can also show charging circuit's current value on the display screen in real time, the user real-time supervision battery's of being convenient for situation of charging.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic block diagram of an embodiment of an overcharge protection circuit of the present invention;
FIG. 2 is a circuit diagram of an embodiment of the present novel overcharge protection circuit;
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides an overcharge protection circuit.
Referring to fig. 1 and fig. 2, in an embodiment of the present invention, the overcharge protection circuit includes: an input port 500 for accessing a power supply; an output port 510 for connection to a battery; the charging circuit 100, the charging circuit 100 includes an input end, an output end, a detection end and a feedback signal output end 310110, the input end of the charging circuit 100 is connected to the input port 500, and the output end of the charging circuit 100 is connected to the output port 510, and is used for outputting the power supply after voltage reduction and current stabilization processing; the input end of the sampling circuit 200 is connected with the detection end of the charging circuit 100 and is used for outputting a sampling signal according to the output current of the charging circuit 100; the control circuit 300 is provided with a detection end, a display signal output end and a feedback signal output end, the detection end of the control circuit 300 is connected with the output end of the sampling circuit 200, the feedback signal output end of the control circuit 300 is electrically connected with the feedback signal output end 310110 of the charging circuit 100, and the control circuit is used for outputting a display signal according to the sampling signal and outputting a first control signal to control the charging circuit 100 to stop charging the battery when the sampling signal is smaller than a preset current value; and a display signal output end of the control circuit 300 is connected with an input end of the display screen 400, and is used for displaying the output current value of the charging circuit 100 according to the display signal.
Specifically, the control circuit 300 of the overcharge protection circuit is provided with a first chip U1, the model of the first chip U1 is HJ189, the pin 5 of the first chip U1 is the detection end of the control circuit 300, the sampling circuit 200 is provided with a first resistor R17, one end of the first resistor R17 is connected with the output end of the charging circuit 100, the other end of the first resistor R17 is connected with the pin 5 of the first chip U1, the pin 5 of the first chip U1 is the power supply voltage input end, the pin 5 of the first chip U1 is connected with the output end of the charging circuit 100, the pin 2 of the first chip U1 is the voltage output end, the pin 2 of the first chip U1 is the feedback signal output end of the control circuit 300, the input end of the pin O1A of the first photoelectric coupler is connected with the output end of the charging circuit 100 through a resistor R12, the output end of the first photoelectric coupler is connected with the pin 2 of the first chip U1, pin 3 of the first chip U1 is grounded; a feedback signal output end 310110 of the charging circuit 100 is provided with a second chip U2, a feedback pin 3 of the second chip U2 is connected with a light emitter O1A of the first photoelectric coupler, a pin 7 of the second chip U2 is grounded, a pin 5 of the second chip U2 is provided with a double-drain open circuit, a pin 5 of the second chip U2 is connected with one end of a primary coil of a voltage transformation module, and the other end of the primary coil of the voltage transformation module is connected with an input end of the charging circuit 100; when the battery is in a charging state, one end of the first photoelectric coupler connected with the pin 2 of the first chip U1 is in a low-level state, so that the light emitter O1A emits light, the light receiver O1B is communicated, and the feedback pin 3 of the second chip U2 detects a feedback signal, so that the double-drain open circuit of the pin 5 of the second chip U2 is in a low-impedance conduction state, and the transformation module can be communicated to continuously charge the battery; when the battery is fully charged, when the pin 6 of the first chip U1 detects that the sampling current is smaller than the preset value, the pin 5 is disconnected by the first chip U1, and then the light emitter O1A of the first photoelectric coupler does not emit light, the light receiver O1B is disconnected, the feedback pin 3 of the second chip U2 cannot detect a feedback signal, and the pin 5 of the second chip U2 is converted into high impedance and is not conducted, so that the primary coil of the voltage transformation module connected with the pin stops working, and the effect that the charging ground circuit stops charging the battery is achieved.
Further, referring to fig. 1 and fig. 2, in this embodiment, the sampling circuit 200 further includes a second resistor R21, a third resistor R22, and a second photocoupler, wherein the second resistor R21 is connected in parallel with the third resistor R22, a first end of the second resistor R21 and a first end of the third resistor R22 after being connected in parallel are connected to the output end of the charging circuit, a second end of the second resistor R21 and the third resistor R22 after being connected in parallel are connected to the input end of the second photocoupler, an output end of the second photocoupler is connected to the pin 8 of the first chip U1, and the pin 8 of the first chip U1 is connected to the display screen 400. Specifically, second resistance R21 and third resistance R22 parallel connection form after the shunt circuit through second optoelectronic coupler with first chip U1's pin 8 is connected, then the real-time charging current when pin 8 of first chip U1 can be more accurate the detection battery charging, first chip U1 shows this real-time charging current on display screen 400 again, convenience of customers judges this charging circuit 100 in real time stably enough, can in time cut off the power when discovering that charging current is unstable, avoid causing the influence to battery or other consumer.
Further, referring to fig. 1 and fig. 2, the charging circuit 100 further includes a fourth resistor and a third photoelectric coupler, one end of the fourth resistor is connected to the output end of the charging circuit 100, the other end of the fourth resistor is connected to the input end of the third photoelectric coupler, the output end of the third photoelectric coupler is connected to the pin 1 of the first chip U1, and the pin 1 of the first chip U1 is connected to the display screen 400. Specifically, stitch 1 of first chip U1 through third optoelectronic coupler and fourth resistance with charging circuit 100's output is connected, can real-time detection the voltage of charging circuit 100's output shows on display screen 400 then, can convenience of customers monitor real-time charging voltage, can make emergency measures fast when charging voltage shows unusually.
Further, please refer to fig. 1 and fig. 2 in combination, in this embodiment, the charging circuit 100 further includes a rectifying module, a transforming module, a filtering module, and an anti-jamming module, an input end of the rectifying module is connected to an input end of the charging circuit 100, the transforming module includes a primary coil and a secondary coil, one end of the primary coil is connected to an output end of the rectifying module, the other end of the primary coil is connected to the open-drain pin 5 of the second chip U2, an input end of the filtering module is connected to the secondary coil, an input end of the anti-jamming module is connected to an output end of the filtering module, and an output end of the anti-jamming module is connected to an output end of the charging circuit 100. Specifically, the rectifying module adopts a bridge rectifier circuit BD1, the transforming module adopts a transformer T1 composed of a primary coil and a secondary coil, the filtering module adopts two electrolytic capacitors C6 and C7 which are connected in parallel, and the anti-interference module adopts an inductor for anti-interference.
The utility model discloses a set up first chip U1 and second chip U2 and first photoelectric coupler, detect charging circuit 100's output current through sampling circuit 200, when charging current is less than the default, first chip U1 and second chip U2 control charging circuit 100 and stop battery charging, play the effect of protection battery power saving; through setting up second resistance R21, third resistance R22, second optoelectronic coupler, electricity four resistance, third optoelectronic coupler and display screen 400, can show charging circuit 100's output voltage and output current in real time on display screen 400, convenience of customers real time monitoring makes emergency treatment when charging voltage or charging current are unusual.
The utility model discloses still provide an overcharge protection charger, this overcharge protection charger includes overcharge protection circuit, this overcharge protection circuit's concrete structure refers to above-mentioned embodiment, because this overcharge protection charger has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, no longer gives unnecessary details one by one here.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims (8)

1. An overcharge protection circuit, comprising:
the input port is used for accessing a power supply;
an output port for connection with a battery;
the charging circuit comprises an input end, an output end, a detection end and a feedback signal input end, the input end of the charging circuit is connected with the input port, and the output end of the charging circuit is connected with the output port and used for outputting the power supply after voltage reduction and current stabilization processing;
the input end of the sampling circuit is connected with the detection end of the charging circuit and is used for outputting a sampling signal according to the output current of the charging circuit;
the control circuit is provided with a detection end, a display signal output end and a feedback signal output end, the detection end of the control circuit is connected with the output end of the sampling circuit, the feedback signal output end of the control circuit is electrically connected with the feedback signal input end of the charging circuit, and the control circuit is used for outputting a display signal according to the sampling signal and outputting a first control signal to control the charging circuit to stop charging the battery when the sampling signal is smaller than a preset current value;
and the display signal output end of the control circuit is connected with the input end of the display screen and is used for displaying the output current value of the charging circuit according to the display signal.
2. The overcharge protection circuit of claim 1, wherein the sampling circuit comprises a first resistor, a first terminal of the first resistor being an input terminal of the sampling circuit, and a second terminal of the first resistor being an output terminal of the sampling circuit.
3. The overcharge protection circuit of claim 2, wherein the control circuit comprises a first chip, a pin 5 of the first chip is connected to an output terminal of the charging circuit, a pin 6 of the first chip is a detection terminal of the control circuit, the pin 6 is connected to a second terminal of the first resistor, pins 2 and 4 of the first chip are feedback signal output terminals of the control circuit, the pin 2 and the pin 4 of the first chip are connected to a feedback signal input terminal of the charging circuit, and when the sampling signal received at the pin 6 of the first chip is smaller than a preset value, the pin 2 and the pin 4 of the first chip output a first control signal to control the charging circuit to stop charging the battery.
4. The overcharge protection circuit of claim 3, wherein the control circuit comprises a first photo coupler, an output terminal of the first photo coupler is connected to the pin 2 of the first chip, two parallel capacitors are disposed between the pin 2 and the pin 4 of the first chip, the control circuit further comprises a second chip, the second chip comprises a feedback pin 3, a light receiver of the photo coupler is connected to the feedback pin 3 of the second chip, the second chip further comprises a pin 5, the pin 5 of the second chip comprises a double-drain open circuit, and the double-drain open circuit pin is connected to an input terminal of the charging circuit.
5. The overcharge protection circuit of claim 4, wherein the sampling circuit further comprises a second resistor, a third resistor, and a second photocoupler, the second resistor and the third resistor are connected in parallel, a first end of the second resistor and the third resistor after being connected in parallel is connected to the output end of the charging circuit, a second end of the second resistor and the third resistor after being connected in parallel is connected to the input end of the second photocoupler, an output end of the second photocoupler is connected to the pin 8 of the first chip, and the pin 8 of the first chip is connected to the display screen.
6. The overcharge protection circuit of claim 4, wherein the charging circuit further comprises a rectifying module, a transforming module, a filtering module, and an anti-interference module, an input of the rectifying module is connected to an input of the charging circuit, the transforming module comprises a primary coil and a secondary coil, one end of the primary coil is connected to an output of the rectifying module, the other end of the primary coil is connected to the open-drain pin 5 of the second chip, an input of the filtering module is connected to the secondary coil, an input of the anti-interference module is connected to an output of the filtering module, and an output of the anti-interference module is connected to an output of the charging circuit.
7. The overcharge protection circuit of claim 6, wherein the charging circuit further comprises a fourth resistor and a third photocoupler, one end of the fourth resistor is connected to the output end of the charging circuit, the other end of the fourth resistor is connected to the input end of the third photocoupler, the output end of the third photocoupler is connected to pin 1 of the first chip, and pin 1 of the first chip is connected to the display screen.
8. An overcharge protection charger, comprising the overcharge protection circuit of any one of claims 1 to 7.
CN202021005865.4U 2020-06-04 2020-06-04 Overcharge protection circuit and overcharge protection charger Active CN212162899U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021005865.4U CN212162899U (en) 2020-06-04 2020-06-04 Overcharge protection circuit and overcharge protection charger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021005865.4U CN212162899U (en) 2020-06-04 2020-06-04 Overcharge protection circuit and overcharge protection charger

Publications (1)

Publication Number Publication Date
CN212162899U true CN212162899U (en) 2020-12-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021005865.4U Active CN212162899U (en) 2020-06-04 2020-06-04 Overcharge protection circuit and overcharge protection charger

Country Status (1)

Country Link
CN (1) CN212162899U (en)

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