CN219086825U - Charge-discharge indicator lamp circuit and electric appliance - Google Patents
Charge-discharge indicator lamp circuit and electric appliance Download PDFInfo
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- CN219086825U CN219086825U CN202222984150.3U CN202222984150U CN219086825U CN 219086825 U CN219086825 U CN 219086825U CN 202222984150 U CN202222984150 U CN 202222984150U CN 219086825 U CN219086825 U CN 219086825U
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Abstract
The utility model discloses a charge and discharge indicator lamp circuit and an electric appliance, wherein the charge and discharge indicator lamp circuit comprises a charging circuit, a rechargeable battery, a protection circuit, a switch circuit and an indicator lamp circuit, wherein the charging circuit is connected with a power interface and used for charging the rechargeable battery; the rechargeable battery is capable of powering the load; the charging negative electrode end of the protection circuit is connected with the negative electrode of the charging circuit and the grounding end of the load, and the protection circuit can disconnect the charging circuit and the ground wire of the load to protect the rechargeable battery; the switch circuit is respectively connected with the rechargeable battery and the load; the indicating lamp circuit is connected with the positive electrode of the rechargeable battery through the switch circuit, a triode is arranged between the indicating lamp circuit and the switch circuit, the emitter of the triode is connected with the switch circuit, the collector of the triode is connected with the indicating lamp circuit, and the base of the triode is connected with the grounding end of the load; the indicator lamp can be normally turned off when the battery is over-discharged for protection.
Description
Technical Field
The utility model relates to the field of battery charging and discharging, in particular to a charging and discharging indicator lamp circuit and an electric appliance.
Background
At present, a low-power electrical appliance with a lithium battery is generally provided with an indicator lamp shared by charging and discharging, and is provided with a lithium battery protection IC (Integrated Circuit ), when the lithium battery is discharged, the indicator lamp can be lightened to display that a load is working, but when the battery is over-discharged for protection, the load can stop working, and the indicator lamp is still in a lightening state to display abnormal functions.
Disclosure of Invention
The utility model aims to at least solve one of the technical problems in the prior art, and provides a charge and discharge indicator lamp circuit and an electric appliance, which can enable an indicator lamp to normally turn off when a battery is over-discharged for protection.
In a first aspect, an embodiment of the present utility model provides a charge-discharge indicator lamp circuit, including: the charging circuit is connected with the power interface, and a power input pin of the charging circuit is connected with a power supply output end of the power interface; the positive electrode of the rechargeable battery is connected with a current output pin of the charging circuit, and the rechargeable battery can supply power for a load; the positive power input pin of the protection circuit is connected with the positive electrode of the rechargeable battery, the charging negative electrode end of the protection circuit is connected with the negative electrode of the charging circuit and the grounding end of the load, and the protection circuit can disconnect the charging circuit and the ground wire of the load to protect the rechargeable battery; the switching circuit is respectively connected with the rechargeable battery and the load; and the indicating lamp circuit is connected with the anode of the rechargeable battery through the switch circuit, a triode is arranged between the indicating lamp circuit and the switch circuit, the emitter of the triode is connected with the switch circuit, the collector of the triode is connected with the indicating lamp circuit, and the base of the triode is connected with the grounding end of the load.
According to the charge-discharge indicator lamp circuit provided by the embodiment of the first aspect of the utility model, the charge-discharge indicator lamp circuit has at least the following beneficial effects: when the discharging voltage of the rechargeable battery is lower, the over-discharging protection of the protection circuit is triggered, the protection circuit cuts off the ground wire of the load, namely, the ground terminal of the load is disconnected and is connected with the ground, the load stops working, meanwhile, the base electrode of the triode is cut off and is connected with the ground, the triode enters a cut-off state, the indicator lamp can not be powered by the rechargeable battery and is turned off, the effect that the indicator lamp is normally turned off when the battery is over-discharged is achieved, and the display function of the indicator lamp is ensured to be normal.
In one embodiment of the utility model, the indicator light circuit comprises a first resistor, a second resistor, a first diode and an indicator light, wherein the positive electrode of the indicator light is connected with the power supply output end through the first resistor, and is connected with the negative electrode of the first diode through the second resistor, and the positive electrode of the first diode is connected with the collector electrode of the triode.
In one embodiment of the present utility model, the charging current setting pin of the charging circuit is grounded through the second resistor, so that the charging current is constant to a preset value.
In one embodiment of the present utility model, a power input pin of the charging circuit is connected to a first end of a third resistor, a second end of the third resistor is connected to the power supply output end, the third resistor is connected in parallel with a fourth resistor, the first end of the third resistor is grounded through a first capacitor, and the second end of the third resistor is grounded through a fifth resistor.
In one embodiment of the utility model, the second capacitor is connected in parallel with the positive and negative terminals of the rechargeable battery.
In one embodiment of the utility model, the positive power input pin of the protection circuit is connected to the positive electrode of the rechargeable battery through a sixth resistor.
In one embodiment of the utility model, the switch circuit comprises a two-gear push switch, a second diode, a third diode and a seventh resistor, wherein the anode of the second diode is connected with the emitter of the triode, the cathode of the second diode is connected with the anode of the load, the anode of the third diode is connected with the anode of the second diode, the cathode of the third diode is connected with the cathode of the second diode, and the seventh resistor is connected with the second diode in parallel.
In one embodiment of the utility model, the charge-discharge indicator lamp circuit further comprises a power-off memory circuit, the power-off memory circuit comprises a fourth diode and a third capacitor, the negative electrode of the fourth diode is connected with the positive electrode of the load, the positive electrode of the fourth diode is connected with the ground terminal of the load, and the third capacitor is connected with the fourth diode in parallel.
In one embodiment of the present utility model, the base of the triode is connected to the ground of the load through an eighth resistor.
In a second aspect, an embodiment of the present utility model provides an electrical apparatus, where the electrical apparatus includes the charge-discharge indicator light circuit provided by any one of the embodiments of the first aspect of the present utility model.
According to the embodiment of the second aspect of the utility model, the electric appliance has at least the following beneficial effects: when the discharging voltage of the rechargeable battery is lower, the over-discharging protection of the protection circuit is triggered, the protection circuit cuts off the ground wire of the load, namely, the ground terminal of the load is disconnected and is connected with the ground, the load stops working, meanwhile, the base electrode of the triode is cut off and is connected with the ground, the triode enters a cut-off state, the indicator lamp can not be powered by the rechargeable battery and is turned off, the effect that the indicator lamp is normally turned off when the battery is over-discharged is achieved, and the display function of the indicator lamp is ensured to be normal.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate and do not limit the utility model.
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic circuit diagram of a charge-discharge indicator lamp circuit according to an embodiment of the present utility model;
fig. 2 is a schematic circuit diagram of another charge-discharge indicator lamp circuit according to an embodiment of the present utility model.
Detailed Description
Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is merely for distinguishing technical features, and should not be construed as indicating or implying relative importance or implying the number of technical features indicated or the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
The embodiment of the utility model provides a charge and discharge indicator lamp circuit and an electric appliance, which can enable an indicator lamp to normally turn off when a battery is over-discharged for protection.
Embodiments of the present utility model will be further described below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a charge-discharge indicator lamp circuit according to an embodiment of the present utility model, where the charge-discharge indicator lamp circuit includes a charging circuit, a rechargeable battery, a protection circuit, a switch circuit and an indicator lamp circuit, the charging circuit is connected with a power interface, and a power input pin of the charging circuit is connected with a power supply output end of the power interface; the positive electrode of the rechargeable battery is connected with a current output pin of the charging circuit, and the rechargeable battery can supply power for a load; the positive power input pin of the protection circuit is connected with the positive electrode of the rechargeable battery, the charging negative electrode end of the protection circuit is connected with the negative electrode of the charging circuit and the grounding end of the load, and the protection circuit can disconnect the charging circuit and the ground wire of the load to protect the rechargeable battery; the switch circuit is respectively connected with the rechargeable battery and the load; the indicator lamp circuit is connected with the anode of the rechargeable battery through the switch circuit, a triode is arranged between the indicator lamp circuit and the switch circuit, the emitter of the triode is connected with the switch circuit, the collector of the triode is connected with the indicator lamp circuit, and the base of the triode is connected with the grounding end of the load; when the discharging voltage of the rechargeable battery is lower, the over-discharging protection of the protection circuit is triggered, the protection circuit cuts off the ground wire of the load, namely, the ground terminal of the load is disconnected and is connected with the ground, the load stops working, meanwhile, the base electrode of the triode is cut off and is connected with the ground, the triode enters a cut-off state, the indicator lamp can not be powered by the rechargeable battery and is turned off, the effect that the indicator lamp is normally turned off when the battery is over-discharged is achieved, and the display function of the indicator lamp is ensured to be normal.
It will be appreciated that in this embodiment, the transistor may be a PNP transistor, the rechargeable battery may be a lithium battery, and the indicator light may be an LED (Light Emitting Diode ) light.
In some embodiments of the present utility model, the charging circuit may be a charging IC ME4054, and ME4054 is a complete constant current/constant voltage linear charging chip for a single lithium ion battery. However, the present embodiment is not particularly limited to the charging circuit, and any charging circuit that can charge a rechargeable battery is within the scope of the present embodiment.
In some embodiments of the utility model, the power interface may be a MICRO USB (Universal Serial Bus ) interface. However, the power interface is not particularly limited in this embodiment, and any power interface can be applied to the charging circuit, and is within the scope of this embodiment.
In some embodiments of the present utility model, the protection circuit may be a lithium battery protection IC DW06D, where DW06D has functions of overcharge, overdischarge, overcurrent, short-circuit, and the like, and is responsible for monitoring the voltage and current of the battery to disconnect the charger or the load. However, the present embodiment is not particularly limited to the protection circuit, and any protection circuit that can protect a rechargeable battery is within the scope of the present embodiment.
As shown in fig. 2, in some embodiments of the present utility model, the indicator light circuit includes a first resistor R1, a second resistor R2, a first diode D1, and an indicator light, where an anode of the indicator light is connected to the power supply output terminal through the first resistor R1, and connected to a cathode of the first diode D1 through the second resistor R2, and an anode of the first diode D1 is connected to a collector of the triode, and the first diode D1 is used to ensure that current can only flow unidirectionally from an anode of the rechargeable battery to an anode of the indicator light. When the power interface is connected with the power supply, the rechargeable battery is in a charging state, the positive electrode of the indicator lamp is connected with the power supply output end through the first resistor R1, the negative electrode of the indicator lamp can be connected with the grounding end of the power interface, the voltage of the rechargeable battery is smaller than that of the power supply, the indicator lamp can be powered by the power supply, the indicator lamp is in a lighting state, the rechargeable battery is in a charging state, and the indicator function is normal.
As shown in fig. 2, in some embodiments of the present utility model, the charging current setting pin of the charging circuit is grounded through the second resistor R2, and those skilled in the art will understand that the second resistor R2 can make the charging current output by the charging circuit constant to a preset value.
In this embodiment, the voltage of the external power source may be 5V, the nominal voltage of the rechargeable battery may be 3.7V, the resistance value of the second resistor R2 may be 3K, and the corresponding preset value of the charging current is 350mA. However, the resistance of the second resistor R2 is not specifically limited in this embodiment, and the resistance of the second resistor R2 may be adjusted according to actual needs, and any value is within the protection range of this embodiment.
As shown in fig. 2, in some embodiments of the present utility model, a power input pin of the charging circuit is connected to a first end of a third resistor R3, a second end of the third resistor R3 is connected to a power supply output end, the third resistor R3 is connected in parallel with a fourth resistor R4, the first end of the third resistor R3 is grounded through a first capacitor C1, and the second end of the third resistor R3 is grounded through a fifth resistor R5. The first capacitor C1 can perform a filtering function, so that the voltage of the power input pin is kept stable.
As shown in fig. 2, in some embodiments of the present utility model, two ends of the positive electrode and the negative electrode of the rechargeable battery are connected in parallel to a second capacitor C2, and two ends of the second capacitor C2 are respectively connected to the positive electrode and the negative electrode of the rechargeable battery, so as to perform functions of energy storage and filtering.
As shown in fig. 2, in some embodiments of the present utility model, a positive power input pin of the protection circuit is connected to the positive electrode of the rechargeable battery through a sixth resistor R6, and the protection circuit may be a protection IC having an overcharge and overdischarge protection function, and is capable of disconnecting a ground line of the charging circuit when overcharged, so that the battery stops being charged to protect the rechargeable battery, and disconnecting a ground line of the load when overdischarged, so that the battery stops being discharged to protect the rechargeable battery.
As shown in fig. 2, in some embodiments of the present utility model, the switch circuit includes a two-stage push switch, a second diode D2, a third diode D3, and a seventh resistor R7, where an anode of the second diode D2 is connected to an emitter of the triode, a cathode of the second diode D2 is connected to an anode of the load, an anode of the third diode D3 is connected to an anode of the second diode D2, a cathode of the third diode D3 is connected to a cathode of the second diode D2, and the seventh resistor R7 is connected in parallel to the second diode D2. The second diode D2, the third diode D3 and the seventh resistor R7 are connected in parallel to shunt, so that the second diode D2 and the third diode D3 bear larger current, and when one of the second diode D2 and the third diode D3 fails, the other can still enable the circuit to operate normally.
It will be appreciated that in this embodiment, the switch in the switch circuit may be provided with three or four gears, which is also within the scope of this embodiment.
As shown in fig. 2, in some embodiments of the present utility model, the charge-discharge indicator circuit further includes a power-off memory circuit, the power-off memory circuit includes a fourth diode D4 and a third capacitor C3, a cathode of the fourth diode D4 is connected to an anode of the load, an anode of the fourth diode D4 is connected to a ground terminal of the load, and the third capacitor C3 is connected in parallel to the fourth diode D4. When the load works, a certain voltage exists on the third capacitor C3, when the power is suddenly cut off, the fourth diode D4 can not discharge the charges of the capacitor in the reverse direction, so that the voltage on the third capacitor C3 is still in a working state, the load can also maintain the working state, and when the power is turned on again, the power-off memory circuit can enable the load to work continuously in a state before the power is cut off in time, and the response time is reduced.
As shown in fig. 2, in some embodiments of the present utility model, the base of the triode is connected to the ground terminal of the load through the eighth resistor R8, so as to avoid voltage oscillation of the base of the triode.
In some embodiments of the utility model, the power interface may be a MICRO USB interface, with a USB supply voltage of 5V; the rechargeable battery may be a lithium battery with a nominal voltage of 3.7V; the pilot lamp can be the LED lamp, and charging circuit can be charging IC ME4054, and protection circuit can be lithium cell protection IC DW06D, and the load can be the fan.
The embodiment of the utility model also provides an electric appliance, which comprises the charge and discharge indicator lamp circuit provided by the embodiment of the utility model, when the discharge voltage of the rechargeable battery is low, the over-discharge protection of the protection circuit is triggered, the protection circuit cuts off the ground wire of the load, namely, the connection between the ground end of the load and the ground is disconnected, the load stops working, and meanwhile, the connection between the base electrode of the triode and the ground is cut off, so that the triode enters a cut-off state, the indicator lamp cannot be powered by the rechargeable battery and is turned off, the effect of normally turning off the indicator lamp when the battery is over-discharge protected is achieved, and the display function of the indicator lamp is ensured to be normal.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.
Claims (10)
1. A charge-discharge indicator lamp circuit, comprising:
the charging circuit is connected with the power interface, and a power input pin of the charging circuit is connected with a power supply output end of the power interface;
the positive electrode of the rechargeable battery is connected with a current output pin of the charging circuit, and the rechargeable battery can supply power for a load;
the positive power input pin of the protection circuit is connected with the positive electrode of the rechargeable battery, the charging negative electrode end of the protection circuit is connected with the negative electrode of the charging circuit and the grounding end of the load, and the protection circuit can disconnect the charging circuit and the ground wire of the load to protect the rechargeable battery;
the switching circuit is respectively connected with the rechargeable battery and the load;
and the indicating lamp circuit is connected with the anode of the rechargeable battery through the switch circuit, a triode is arranged between the indicating lamp circuit and the switch circuit, the emitter of the triode is connected with the switch circuit, the collector of the triode is connected with the indicating lamp circuit, and the base of the triode is connected with the grounding end of the load.
2. The charge-discharge indicator light circuit according to claim 1, wherein the indicator light circuit comprises a first resistor, a second resistor, a first diode and an indicator light, wherein the positive electrode of the indicator light is connected with the power supply output end through the first resistor, and is connected with the negative electrode of the first diode through the second resistor, and the positive electrode of the first diode is connected with the collector electrode of the triode.
3. The charge-discharge indicator light circuit of claim 1, wherein the charge current setting pin of the charging circuit is grounded through the second resistor to make the charge current constant at a preset value.
4. The charge-discharge indicator light circuit of claim 1, wherein the power input pin of the charging circuit is connected to a first end of a third resistor, a second end of the third resistor is connected to the power supply output, the third resistor is connected in parallel with a fourth resistor, the first end of the third resistor is grounded through the first capacitor, and the second end of the third resistor is grounded through the fifth resistor.
5. The charge-discharge indicator light circuit of claim 1, wherein the second capacitor is connected in parallel across the positive and negative terminals of the rechargeable battery.
6. The charge-discharge indicator light circuit of claim 1, wherein the positive power input pin of the protection circuit is connected to the positive electrode of the rechargeable battery through a sixth resistor.
7. The charge-discharge indicator light circuit of claim 1, wherein the switch circuit comprises a two-stage push switch, a second diode, a third diode and a seventh resistor, the anode of the second diode is connected with the emitter of the triode, the cathode of the second diode is connected with the anode of the load, the anode of the third diode is connected with the anode of the second diode, the cathode of the third diode is connected with the cathode of the second diode, and the seventh resistor is connected in parallel with the second diode.
8. The charge-discharge indicator light circuit of claim 1, further comprising a power-off memory circuit, the power-off memory circuit comprising a fourth diode and a third capacitor, a negative electrode of the fourth diode connected to a positive electrode of the load, a positive electrode of the fourth diode connected to a ground terminal of the load, and the third capacitor connected in parallel with the fourth diode.
9. The charge and discharge indicator lamp circuit of claim 4, wherein the base of the triode is connected to the ground terminal of the load through an eighth resistor.
10. An electrical appliance comprising a charge and discharge indicator light circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222984150.3U CN219086825U (en) | 2022-11-09 | 2022-11-09 | Charge-discharge indicator lamp circuit and electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222984150.3U CN219086825U (en) | 2022-11-09 | 2022-11-09 | Charge-discharge indicator lamp circuit and electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219086825U true CN219086825U (en) | 2023-05-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222984150.3U Active CN219086825U (en) | 2022-11-09 | 2022-11-09 | Charge-discharge indicator lamp circuit and electric appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219086825U (en) |
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2022
- 2022-11-09 CN CN202222984150.3U patent/CN219086825U/en active Active
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