CN210129746U

CN210129746U - Overcharge detection device

Info

Publication number: CN210129746U
Application number: CN201920788189.3U
Authority: CN
Inventors: 李鸿渊
Original assignee: Merry Electronics Shenzhen Co ltd
Current assignee: Merry Electronics Shenzhen Co ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-03-06
Anticipated expiration: 2029-05-29

Abstract

The utility model relates to an overcharge detection device, it includes first battery, second battery, current detection circuit, charger and control circuit. The second battery and the first battery are separately arranged, the current detection circuit is electrically connected with the first battery and the second battery, the charger is electrically connected with the current detection circuit, and the control circuit is electrically connected with the current detection circuit. The control circuit judges whether or not overcharging is performed based on a level value of an output voltage of the current detection circuit.

Description

Overcharge detection device

Technical Field

The utility model relates to a detection technique charges, especially relates to an overcharge detection device.

Background

Rechargeable batteries generally refer to all chemical energy batteries that can be recharged and reused after a certain amount of electricity has been used. A charger is a device for inputting energy into a rechargeable battery by forcing current through it.

When the charger charges two independent batteries, if a certain battery is disconnected from the charger and cannot be charged, the whole electric quantity is over-current charged to the other battery, and the other battery can be damaged. Therefore, how to detect the overcharge becomes an important issue.

SUMMERY OF THE UTILITY MODEL

The application provides an overcharge detection device, which improves the problems of the prior art.

In one embodiment, the overcharge detection device provided by the application comprises a first battery, a second battery, a current detection circuit, a charger and a control circuit; the second battery and the first battery are separately arranged, the current detection circuit is electrically connected with the first battery and the second battery, the charger is electrically connected with the current detection circuit, and the control circuit is electrically connected with the current detection circuit; the control circuit judges whether or not overcharging is performed based on a level value of an output voltage of the current detection circuit.

In one embodiment, the current detection circuit includes a first resistor, a second resistor, and an amplifier circuit; the second resistor is connected in series with the first resistor, and the amplifier circuit is electrically connected with the first resistor and the second resistor respectively.

In one embodiment, one end of the first resistor is electrically connected to the first battery, and the other end of the first resistor is electrically connected to an output node of the charger.

In one embodiment, one end of the second resistor is electrically connected to the output node of the charger, and the other end of the second resistor is electrically connected to the second battery.

In one embodiment, the amplifier circuit includes an operational amplifier, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor; the operational amplifier is provided with an inverting input end, a non-inverting input end and an output end, two ends of the third resistor are respectively and electrically connected with the end of the first resistor and the inverting input end, two ends of the fourth resistor are respectively and electrically connected with the other end of the second resistor and the non-inverting input end, two ends of the fifth resistor are respectively and electrically connected with the inverting input end and the output end, and two ends of the sixth resistor are respectively and electrically connected with the non-inverting input end and the bias voltage source.

In one embodiment, the control circuit comprises an analog-to-digital converter and a controller; the analog-digital converter is electrically connected with the output end of the operational amplifier in the current detection circuit, and the controller is electrically connected with the analog-digital converter; the analog-digital converter converts the level value of the output voltage into a digital signal; when the controller determines that the level value of the output voltage is higher than the voltage level value of the bias source by a predetermined potential difference or lower by a predetermined potential difference based on the digital signal, the controller controls the charger to stop supplying power.

In one embodiment, the controller is a microcontroller.

In one embodiment, the first battery is a left ear headphone battery and the second battery is a right ear headphone battery.

In one embodiment, the first battery is a right ear headphone battery and the second battery is a left ear headphone battery.

In one embodiment, the overcharge detection device further includes a connector electrically connected to the charger.

In summary, the technical scheme of the application has obvious advantages and beneficial effects compared with the prior art. The technical scheme of this application has realized that the overcharge detects, improves the problem of prior art.

Drawings

Fig. 1 is a block diagram of an overcharge detection device in one embodiment.

Wherein:

100: overcharge detecting device 110: connector with a locking member

120: the charger 122: output node

131: first battery 132: second battery

140: current detection circuit 142: amplifier circuit

143: the operational amplifier 145: output end

150: the control circuit 151: analog-to-digital converter

152: a controller C: capacitor with a capacitor element

R1: first resistor R2: second resistor

R3: third resistor R4: fourth resistor

R5: fifth resistor R6: sixth resistor

VBIAS: bias source VCC: voltage source

Detailed Description

In order to make the description of the present application more complete and complete, reference is made to the appended drawings and various embodiments described below, in which like reference numerals refer to the same or similar elements. In other instances, well-known elements and steps have not been described in detail in order to avoid unnecessarily obscuring the present application.

In the description of the embodiments and claims, reference to "connected" may refer broadly to a component being indirectly coupled to another component through another component or a component being directly connected to another component without the need for other components.

In the description and claims, the terms "a" and "an" can be used broadly to refer to a single or to a plurality of elements, unless the context specifically states the article.

As used herein, "about" or "approximately" is used to modify the amount of any slight variation which does not alter the nature thereof. Unless otherwise specified, the range of error for values modified by "about", "about" or "approximately" is generally tolerated within twenty percent, preferably within ten percent, and more preferably within five percent.

Fig. 1 is a block diagram of an overcharge detection device 100 in one embodiment. As shown in fig. 1, the overcharge detecting device 100 includes a connector 110, a charger 120, a first battery 131, a second battery 132, a current detecting circuit 140, and a control circuit 150. For example, the first battery 131 is a left ear earphone battery, and the second battery 132 is a right ear earphone battery; alternatively, the first battery 131 is a right ear headphone battery and the second battery 132 is a left ear headphone battery.

Structurally, the second battery 132 and the first battery 131 are separately disposed, the current detection circuit 140 is electrically connected to the first battery 131 and the second battery 132, the connector 110 is electrically connected to the charger 120, the charger 120 is electrically connected to the current detection circuit 140, and the control circuit 150 is electrically connected to the current detection circuit 140. In operation, the connector 110 is available for connection to an external power source, and the control circuit 150 determines whether to overcharge based on the level value of the output voltage of the current detection circuit 140.

In fig. 1, the current detection circuit 140 includes a first resistor R1, a second resistor R2, and an amplifier circuit 142. Structurally, the second resistor R2 is connected in series with the first resistor R1, and the amplifier circuit 142 is electrically connected to the first resistor R1 and the second resistor R2, respectively.

In fig. 1, a first end of the first resistor R1 is electrically connected to the first battery 131, and a second end of the first resistor R1 is electrically connected to the output node 122 of the charger 120. A first end of the second resistor R2 is electrically connected to the output node 122 of the charger 120, and a second end of the second resistor R2 is electrically connected to the second battery 132.

In fig. 1, the amplifier circuit 142 includes an operational amplifier 143, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. Structurally, the operational amplifier 143 has an inverting input (e.g., -terminal), a non-inverting input (e.g., + terminal), and an output 145. Two ends of the third resistor R3 are electrically connected to the first end and the inverting input (e.g., -end) of the first resistor R1, two ends of the fourth resistor R4 are electrically connected to the second end and the non-inverting input (e.g., + end) of the second resistor R2, two ends of the fifth resistor R5 are electrically connected to the inverting input (e.g., -end) and the output 145, and two ends of the sixth resistor R6 are electrically connected to the non-inverting input (e.g., + end) and the bias source VBIAS, respectively. For example, the voltage level of the bias source VBIAS may be half of the voltage level of the voltage source VCC, which is electrically connected to the capacitor C.

In fig. 1, the control circuit 150 includes an analog-to-digital converter 151 and a controller 152 (e.g., a microcontroller). Structurally, the adc 151 is electrically connected to the output terminal 145, and the controller 152 is electrically connected to the adc 151. The analog-to-digital converter 151 converts the level value of the output voltage into a digital signal; when the controller 152 determines that the level value of the output voltage of the current detection circuit 140 is higher than the voltage level value of the biasing source VBIAS by a predetermined potential difference or lower than the predetermined potential difference based on the digital signal, the controller 152 controls the charger 120 to stop the power supply.

For example, if the level value of the output voltage of the current detection circuit 140 is higher than the voltage level value of the bias source VBIAS than a predetermined potential difference, which indicates that the charger 120 and the second battery 132 are disconnected from charging, the controller 152 controls the charger 120 to stop supplying power, so as to prevent the entire amount of power from being over-charged to the first battery 131, thereby preventing the first battery 131 from being damaged. On the contrary, if the level value of the output voltage of the current detection circuit 140 is lower than the voltage level value of the bias source VBIAS than the predetermined potential difference, it represents that the charger 120 is disconnected from the first battery 131 and cannot be charged, the controller 152 controls the charger 120 to stop supplying power, so as to prevent the whole electric quantity from over-current charging to the second battery 132, thereby preventing the second battery 132 from being damaged.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An overcharge detection device, comprising:

a first battery;

a second battery provided separately from the first battery;

the current detection circuit is electrically connected with the first battery and the second battery;

the charger is electrically connected with the current detection circuit; and

and the control circuit is electrically connected with the current detection circuit and judges whether the charging is excessive or not based on the level value of the output voltage of the current detection circuit.

2. The overcharge detection device of claim 1, wherein the current detection circuit comprises:

a first resistor;

a second resistor connected in series with the first resistor; and

and the amplifier circuit is electrically connected with the first resistor and the second resistor respectively.

3. The overcharge detection device of claim 2, wherein a first end of the first resistor is electrically connected to the first battery, and a second end of the first resistor is electrically connected to an output node of the charger.

4. The overcharge detection device of claim 3 wherein a first end of the second resistor is electrically connected to the output node of the charger and a second end of the second resistor is electrically connected to the second battery.

5. The overcharge detection device of claim 4, wherein the amplifier circuit comprises:

an operational amplifier having an inverting input terminal, a non-inverting input terminal and an output terminal;

a third resistor, two ends of which are electrically connected to the first end and the inverted input end of the first resistor respectively;

a fourth resistor, two ends of which are electrically connected to the second end of the second resistor and the non-inverting input end respectively;

a fifth resistor, two ends of which are electrically connected to the inverting input terminal and the output terminal, respectively; and

and the two ends of the sixth resistor are respectively and electrically connected with the non-inverting input end and a bias voltage source.

6. The overcharge detection device of claim 5 wherein the control circuit comprises:

the analog-digital converter is electrically connected with the output end and converts the level value of the output voltage into a digital signal; and

and the controller is electrically connected with the analog-digital converter, and controls the charger to stop supplying power when the controller judges that the level value of the output voltage is higher than the voltage level value of the bias source by a preset potential difference or lower than the voltage level value of the bias source by a preset potential difference based on the digital signal.

7. The overcharge detection apparatus of claim 6 wherein the controller is a microcontroller.

8. The overcharge detection apparatus of claim 1 wherein the first battery is a left ear earphone battery and the second battery is a right ear earphone battery.

9. The overcharge detection apparatus of claim 1 wherein the first battery is a right ear headphone battery and the second battery is a left ear headphone battery.

10. The overcharge detection device of claim 1, further comprising:

the connector is electrically connected with the charger.