CN210041353U - Charger circuit - Google Patents
Charger circuit Download PDFInfo
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- CN210041353U CN210041353U CN201821677031.0U CN201821677031U CN210041353U CN 210041353 U CN210041353 U CN 210041353U CN 201821677031 U CN201821677031 U CN 201821677031U CN 210041353 U CN210041353 U CN 210041353U
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Abstract
The utility model discloses a charger circuit, which comprises a power circuit for generating charging voltage, a charging output switch, a MCU and an electric appliance insertion detection circuit; the MCU is connected with the positive output end or the negative output end of the power circuit through a current sampling element so as to detect the charging current in the charging loop, and is also connected with the positive connecting end of the charging interface so as to detect the charging voltage in the charging loop. Utilize the utility model provides a charger circuit, charger can intelligent judgement have the electrical apparatus that needs charge to insert the interface that charges of charger to open corresponding charge mode automatically and charge to it, and can effectively solve the battery overcharge problem of electrified pond consumer electrical apparatus, thereby prolong battery life, and avoid the battery overcharge and the calamity that causes.
Description
Technical Field
The utility model relates to a charger circuit especially relates to a charger circuit suitable for various electrified pond consumer electrical apparatus.
Background
At present, the conventional charger for consumer appliances with batteries, including standard chargers produced by manufacturers of consumer appliances with batteries when leaving factories, can only keep the batteries in a charging state after being powered on. Most of the existing various electronic devices use USB interfaces for power supply, and the voltage is basically the same. In real life, a USB interface charger is sometimes used as a power source for various electronic devices. Therefore, the USB interface charger is always in the on state to supply power. The charger is always in the on state to supply power, and the disadvantages that the service life of the battery is short when the charging management is not perfect, the battery is damaged by overcharging, and even more, the battery is ignited, and further, the risk of fire is caused. In addition, the battery is a consumer, and the performance and electrical parameter indexes of the battery have large differences along with the accumulation of the use time. Therefore, it is more desirable to prevent overcharging of the battery during charging so as not to cause damage and to extend the life of the battery.
SUMMERY OF THE UTILITY MODEL
For overcoming the not enough problem that reaches the existence of prior art, the utility model provides a charger circuit to effectively solve the battery overcharge problem of electrified pond consumer electrical apparatus, with extension battery life, and avoid the battery overcharge and the calamity that causes.
The utility model discloses a realize through following technical scheme: a charger circuit comprises a power supply circuit for generating charging voltage, a charging output switch, an MCU and an electric appliance insertion detection circuit;
the positive output end and the negative output end of the power circuit are respectively connected with the positive connecting end and the negative connecting end of the charging interface to form a charging loop;
the input end and the output end of the charging output switch are connected in the charging loop in series, and the control end of the charging output switch is connected with the MCU;
the signal input end of the electric appliance insertion detection circuit is connected with the negative connecting end of the charging interface, and the signal output end of the electric appliance insertion detection circuit is connected with the MCU and used for detecting whether the charging interface is connected with an electric appliance or not;
the MCU is connected with the positive output end or the negative output end of the power circuit through a current sampling element so as to detect the charging current in the charging loop, and is also connected with the positive connecting end of the charging interface so as to detect the charging voltage in the charging loop.
Preferably, the switching device in the charging output switch is a mosfet, a power transistor or a relay; the charging voltage generated by the power supply circuit comprises 5V, 9V or 12V; the charging interface is a USB charging interface; the current sampling element is a resistor or a current transformer.
Preferably, the electric appliance insertion detection circuit includes a switch Q2, the drain of the switch Q2 is connected to the voltage source VCC through a resistor R3, the gate of the switch Q2 is connected to the negative connection terminal of the charging interface through a resistor R2, and the source of the switch Q2 is grounded.
Furthermore, the charger circuit also comprises a key control and indication circuit connected with the MCU, and the key control and indication circuit comprises a key circuit used for switching the charging mode of the charger and an indication lamp circuit used for indicating the charging mode.
Utilize the utility model provides a charger circuit, charger can intelligent judgement have the electrical apparatus that needs charge to insert the interface that charges of charger to open corresponding charge mode automatically and charge to it, and can effectively solve the battery overcharge problem of electrified pond consumer electrical apparatus, thereby prolong battery life, and avoid the battery overcharge and the calamity that causes.
Drawings
Fig. 1 is a schematic circuit diagram of a charger circuit according to an embodiment of the present invention.
Wherein the reference numbers are as follows: 1-power supply circuit, 2-MCU, 3-charging interface, 4-electric appliance insertion detection circuit and 5-key control and indication circuit.
Detailed Description
To facilitate understanding of those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a charger circuit includes a power supply circuit 1 for generating a charging voltage, a charging output switch, an MCU2, and an appliance insertion detection circuit 4; the positive output end and the negative output end of the power circuit are respectively connected with the positive connecting end and the negative connecting end of the charging interface 3 to form a charging loop; the input end and the output end of the charging output switch are connected in the charging loop in series, and the control end of the charging output switch is connected with the MCU; the signal input end of the electric appliance insertion detection circuit is connected with the negative connecting end of the charging interface, and the signal output end of the electric appliance insertion detection circuit is connected with the MCU and used for detecting whether the charging interface is connected with an electric appliance or not; the MCU is connected with the positive output end or the negative output end of the power circuit through a current sampling element so as to detect the charging current in the charging loop, and is also connected with the positive connecting end of the charging interface so as to detect the charging voltage in the charging loop. In this embodiment, the charging voltage generated by the power circuit includes 5V, 9V, 12V, or the like; the charging interface is preferably a USB charging interface.
In one preferred embodiment, the switching device Q1 in the charge output switch may be a mosfet, a power transistor, or a relay; in addition, the current sampling element is a resistor or a current transformer. In this embodiment, the switching device Q1 is preferably a mosfet, the gate of the mosfet is connected to the MCU as a control terminal, and the drain and source of the mosfet are connected to the charge circuit as input and output terminals, as shown in fig. 1. The current sampling element is preferably a high-precision resistor R1; the MOSFET has the advantages of being a voltage type device, easy to drive, simple in driving circuit, small in loss, and small in conduction voltage drop, and does not influence the charging voltage of the consumer appliance with the battery. As shown in fig. 1, one end of the high-precision resistor R1 is connected to the negative output terminal of the power circuit, the other end is connected to the source of the switching device Q1, the drain of the switching device Q1 is connected to the negative connection terminal of the charging interface, and the gate of the switching device Q1 is connected to the MCU. In addition, the electric appliance insertion detection circuit comprises a switch tube Q2, the drain electrode of the switch tube Q2 is connected with a voltage source VCC through a resistor R3, the grid electrode of the switch tube Q2 is connected with the negative connection end of the charging interface through a resistor R2, and the source electrode of the switch tube Q2 is grounded.
As a preferred embodiment, the charger circuit further includes a key control and indication circuit connected to the MCU, and the key control and indication circuit includes a key circuit for switching a charging mode of the charger and an indication lamp circuit for indicating the charging mode. In this embodiment, the charging mode includes an intelligent charging mode and a conventional charging mode. As shown in FIG. 1, the key circuit comprises a key K and a resistor R4, the indicator light circuit comprises an R5 and an indicator light D1, and the specific circuit structures of the key circuit and the indicator light circuit are shown in FIG. 1 and will not be described in detail.
The following provides a corresponding explanation of the working principle or working process of the charger circuit provided in this embodiment: in this embodiment, the sampling detection of the charging voltage and the charging current in the charging loop is realized through the AD sampling of the MCU, and the principle that the MCU collects voltage and current signals belongs to the prior art, and is not described in detail here. Of course, the acquisition and detection of the charging voltage and the charging current can also be realized by using an analog operational amplifier circuit, a comparator, a digital circuit and the like in the prior art.
In order to realize that whether an electric appliance needing to be charged is inserted into a charging interface of a charger in an intelligent judgment charging interface, the electric appliance is inserted into a detection circuit to realize the intelligent judgment function, and the working principle is as follows: when the consumer with the battery is inserted into the charging interface (the USB charging interface in the embodiment), the internal circuit of the consumer with the battery or the internal circuit of the apple data line can connect the positive connecting end and the negative connecting end of the USB charging interface to form a loop, and at the moment, the internal circuit of the consumer with the battery or the internal circuit of the apple data line has large internal resistance and cannot charge the consumer with the battery; but the loop formed at this moment can form a signal to activate a switch tube Q2 of the electric appliance inserted into the detection circuit, so that the MCU detects the high and low potential of the leakage stage of the switch tube Q2, thereby detecting the insertion of the battery-containing consumer electric appliance or the apple data line; the switching tube Q2 in this embodiment can be a field effect transistor or a triode.
When the charging interface of the charger is connected to the consumer electric appliance with the battery, the switching tube Q2 is cut off, the switching device Q1 is switched on, the charger starts to charge the battery in the consumer electric appliance, the charger automatically starts an intelligent charging mode to charge, if a conventional charging mode is needed, the charging mode can be switched through the control key K, and meanwhile, the indicator lamp D1 can also indicate different charging modes through different working states. In the charging process, the MCU detects the charging current and the charging voltage in the charging loop, and when the phenomenon that the battery is charged or the circuit is short-circuited is detected, the MCU outputs a corresponding signal to cut off the switching device Q1 and cut off the charging loop, so that the overcharge of the battery is effectively prevented.
In this embodiment, the intelligent charging mode is a default charging mode, and it determines whether the charging is completed to complete the charging by detecting the charging current, and when detecting that the charging current is less than a preset current value (for example, 50mA), the MCU sends a corresponding control signal to turn off the switching device Q1, so as to open the charging loop, stop charging the battery, and effectively avoid the occurrence of the overcharge phenomenon of the battery. The magnitude of the detected charging current belongs to the prior art, and the utility model discloses do not relate to the improvement of computer program. The conventional charging mode refers to a common charging mode without a function of preventing the overcharge of the battery in the prior art.
Utilize the utility model provides a charger circuit, charger can intelligent judgement have the electrical apparatus that needs charge to insert the interface that charges of charger to open corresponding charge mode automatically and charge to it, and can effectively solve the battery overcharge problem of electrified pond consumer electrical apparatus, thereby prolong battery life, and avoid the battery overcharge and the calamity that causes.
The above embodiments are preferred implementations of the present invention, and are not intended to be limiting, and any obvious replacement is within the scope of the present invention without departing from the inventive concept of the present invention.
Claims (6)
1. A charger circuit, characterized by: the charger circuit comprises a power supply circuit for generating charging voltage, a charging output switch, an MCU and an electric appliance insertion detection circuit;
the positive output end and the negative output end of the power circuit are respectively connected with the positive connecting end and the negative connecting end of the charging interface to form a charging loop;
the input end and the output end of the charging output switch are connected in the charging loop in series, and the control end of the charging output switch is connected with the MCU;
the signal input end of the electric appliance insertion detection circuit is connected with the negative connecting end of the charging interface, and the signal output end of the electric appliance insertion detection circuit is connected with the MCU and used for detecting whether the charging interface is connected with an electric appliance or not;
the MCU is connected with the positive output end or the negative output end of the power supply circuit through a current sampling element so as to detect the charging current in the charging loop, and is also connected with the positive connecting end of the charging interface through a voltage sampling circuit so as to detect the charging voltage in the charging loop;
the electric appliance insertion detection circuit comprises a switch tube Q2, the drain electrode of the switch tube Q2 is connected with a voltage source VCC through a resistor R3, the grid electrode of the switch tube Q2 is connected with the negative connection end of the charging interface through a resistor R2, and the source electrode of the switch tube Q2 is grounded.
2. The charger circuit of claim 1, wherein: and a switching device in the charging output switch is a MOSEFT, a power triode or a relay.
3. The charger circuit according to any one of claims 1 to 2, wherein: the charger circuit also comprises a key control and indication circuit connected with the MCU, and the key control and indication circuit comprises a key circuit used for switching the charging mode of the charger and an indication lamp circuit used for indicating the charging mode.
4. The charger circuit of claim 3, wherein: the charging voltage generated by the power supply circuit comprises 5V, 9V or 12V.
5. The charger circuit of claim 3, wherein: the charging interface is a USB charging interface.
6. The charger circuit of claim 3, wherein: the current sampling element is a resistor or a current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821677031.0U CN210041353U (en) | 2018-10-16 | 2018-10-16 | Charger circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821677031.0U CN210041353U (en) | 2018-10-16 | 2018-10-16 | Charger circuit |
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| Publication Number | Publication Date |
|---|---|
| CN210041353U true CN210041353U (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821677031.0U Active CN210041353U (en) | 2018-10-16 | 2018-10-16 | Charger circuit |
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| CN (1) | CN210041353U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217425A (en) * | 2018-10-16 | 2019-01-15 | 深圳市联讯发科技有限公司 | A kind of charger circuit and its intelligent charge control method |
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2018
- 2018-10-16 CN CN201821677031.0U patent/CN210041353U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217425A (en) * | 2018-10-16 | 2019-01-15 | 深圳市联讯发科技有限公司 | A kind of charger circuit and its intelligent charge control method |
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