CN211579629U - Constant voltage and constant current charging device applied to low-power-consumption environment - Google Patents
Constant voltage and constant current charging device applied to low-power-consumption environment Download PDFInfo
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- CN211579629U CN211579629U CN201922371633.4U CN201922371633U CN211579629U CN 211579629 U CN211579629 U CN 211579629U CN 201922371633 U CN201922371633 U CN 201922371633U CN 211579629 U CN211579629 U CN 211579629U
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Abstract
The utility model discloses a be applied to constant voltage constant current charging device of low-power consumption environment, include: the device comprises a power supply anode, a constant current source circuit, a low dropout regulator (LDO), a battery to be charged and a power supply cathode which are connected in sequence; the connection point between the constant current source circuit and the low dropout regulator LDO is connected with the negative pole of the power supply through an input capacitor C1; the connection point between the low dropout regulator LDO and the battery to be charged is connected with the negative electrode of the power supply through a capacitor C2; the connection point between the LDO and the battery to be charged is also connected with the negative electrode of the power supply through a feedback resistor R1 and a feedback resistor R2 which are connected in series; and the connection point between the feedback resistor R1 and the feedback resistor R2 is connected with the positive input end of an error amplifier of the LDO.
Description
Technical Field
The utility model relates to a constant voltage constant current charging technical field especially relates to a be applied to constant voltage constant current charging device of low-power consumption environment.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, a plurality of methods for charging a battery or a capacitor are required, but large current and high efficiency are mostly pursued, and in some low-power consumption fields, large current charging cannot meet requirements, for example, in occasions of remote small current power supply, weak energy collection and the like, only a few mA of current can be provided, and at the moment, the large current charging is obviously not suitable.
In the process of implementing the present invention, the inventor finds the following technical problems in the prior art:
at present, few charging methods based on a few mA currents are available, or constant voltage and constant current cannot be realized, and effective protection of a rear-stage battery or a capacitor cannot be realized. The method has simple composition, can realize small-current constant-voltage constant-current charging, and is simple and effective.
Disclosure of Invention
In order to solve the defects of the prior art, the utility model provides a constant voltage and constant current charging device applied to the low power consumption environment; the charging based on a few mA currents can be realized, the constant voltage and the constant current are realized, and the effective protection effect on a rear-stage battery or a capacitor is realized. The method has simple composition, can realize small-current constant-voltage constant-current charging, and is simple and effective.
In a first aspect, the present invention provides a constant voltage and constant current charging device for low power consumption environments;
a constant voltage and constant current charging device applied to a low power consumption environment comprises:
the device comprises a power supply anode, a constant current source circuit, a low dropout regulator (LDO), a battery to be charged and a power supply cathode which are connected in sequence;
the connection point between the constant current source circuit and the low dropout regulator LDO is connected with the negative pole of the power supply through an input capacitor C1;
the connection point between the low dropout regulator LDO and the battery to be charged is connected with the negative electrode of the power supply through a capacitor C2;
the connection point between the LDO and the battery to be charged is also connected with the negative electrode of the power supply through a feedback resistor R1 and a feedback resistor R2 which are connected in series;
and the connection point between the feedback resistor R1 and the feedback resistor R2 is connected with the positive input end of an error amplifier of the LDO.
After the input current passes through the constant current source circuit, the constant current source circuit performs constant current control on the input current;
the input current after constant current control is sent to a low dropout regulator (LDO), and the LDO adjusts the output voltage of the input current;
the current output by the LDO charges a battery to be charged.
Compared with the prior art, the beneficial effects of the utility model are that:
because the LDO has the characteristic of low-current starting, and the constant current source circuit can set the current by self, the method can realize the charging of the battery or the capacitor with milliampere level or even microampere level low current, and the common charging method cannot realize the charging. The utility model discloses no matter constant current source circuit or low dropout linear voltage regulator all have a lot of selections. The method can set the charging current through the constant current source circuit, can set the charging voltage through the change of the feedback resistor, is very flexible, and is suitable for charging occasions using various voltages and currents. The method is an abnormal working mode (non-constant voltage in the charging process and constant voltage at the end of charging) of the applied LDO, so that the method has an innovative effect.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a block diagram of constant voltage and constant current charging in a low power consumption environment according to a first embodiment;
fig. 2 is a schematic diagram of the constant voltage and constant current charging circuit in a low power consumption environment according to the first embodiment.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In a first embodiment, the present invention provides a constant voltage and constant current charging device applied in a low power consumption environment;
as shown in fig. 1 and 2, a constant voltage and constant current charging device applied to a low power consumption environment includes:
the device comprises a power supply anode, a constant current source circuit, a low dropout regulator (LDO), a battery to be charged and a power supply cathode which are connected in sequence;
the connection point between the constant current source circuit and the low dropout regulator LDO is connected with the negative pole of the power supply through an input capacitor C1;
the connection point between the low dropout regulator LDO and the battery to be charged is connected with the negative electrode of the power supply through a capacitor C2;
the connection point between the LDO and the battery to be charged is also connected with the negative electrode of the power supply through a feedback resistor R1 and a feedback resistor R2 which are connected in series;
and the connection point between the feedback resistor R1 and the feedback resistor R2 is connected with the positive input end of an error amplifier of the LDO.
Furthermore, the reverse input end of the error amplifier is connected with the negative electrode of the power supply through a voltage reference source;
further, the output end of the error amplifier is connected with the adjusting tube;
furthermore, one end of the adjusting tube is connected with the output end of the constant current circuit, and the other end of the adjusting tube is connected with the battery to be charged.
Further, the minimum divided voltage of the constant current source circuit is a set value.
Further, the maximum charging current of the constant current source circuit is a set value.
Further, the final charging voltage V of the battery or the capacitor to be charged is set by setting the output voltage of the low dropout regulator LDO through the feedback resistor R1 and the feedback resistor R2, so as to realize the function of constant voltage charging protection.
After the input current passes through the constant current source circuit, the constant current source circuit performs constant current control on the input current;
the input current after constant current control is sent to a low dropout regulator (LDO), and the LDO adjusts the output voltage of the input current;
the current output by the LDO charges a battery to be charged.
Further, the constant current source circuit may be implemented in a conventional variety of ways. The constant current source circuit has a voltage division effect in the constant current process, so the minimum voltage division V constant min of the constant current source circuit is considered in the design.
Further, the low dropout regulator LDO adjusts the output voltage of the input current by adjusting the resistance values of the feedback resistor R1 and the feedback resistor R2, so as to adapt to different batteries or capacitors to be charged.
Further, the minimum divided voltage of the constant current source circuit is a set value.
Further, the maximum charging current of the constant current source circuit is a set value.
Further, the final charging voltage V of the battery or the capacitor to be charged is set by setting the output voltage of the low dropout regulator LDO through the feedback resistor R1 and the feedback resistor R2, so as to realize the function of constant voltage charging protection.
Further, in the charging process, if the actual output voltage of the low dropout regulator LDO is lower than the set output voltage V of the low dropout regulator LDO regulated by the feedback resistor, it indicates that the low dropout regulator LDO is operating in an abnormal state;
under the abnormal state, the set output voltage of the low dropout regulator LDO is the highest charging voltage Vc of a battery or a capacitor to be charged;
under the condition of not fully charging, the voltage of a battery or a capacitor to be charged is lower than the highest charging voltage Vc, so the actual output voltage of the low dropout regulator LDO is lower than the set output voltage, at the moment, an error amplifier in the low dropout regulator LDO regulates an internal adjusting tube to be conducted to the optimal conducting state, but the current cannot be actually increased, and the actual current is controlled by a constant current source circuit at the front stage of the low dropout regulator LDO;
along with the progress of charging, wait that rechargeable battery or electric capacity's voltage rises gradually, low dropout linear regulator LDO's actual output voltage also rises along with gradually, when low dropout linear regulator LDO's actual output voltage reached and sets for output voltage, low dropout linear regulator LDO's actual output voltage will maintain invariably no longer to rise to invariable the setting for output voltage at low dropout linear regulator LDO with actual output voltage, realize the effect of constant voltage, thereby protection battery or electric capacity can not be in the state of excessive pressure.
Further, in the charging process, if the actual output voltage of the low dropout regulator LDO is equal to the set output voltage V of the low dropout regulator LDO regulated by the feedback resistor, the LDO operates in a normal state, and the charging voltage reaches the set voltage at the same time, indicating that the charging is cut off.
The utility model discloses a theory of operation is:
1. setting charging current: the constant current source circuit limits the maximum charging current Imax;
2. setting charging voltage: the final charging voltage V of the battery or the capacitor is set by setting the output voltage of the low dropout regulator LDO through the feedback resistor, so that the function of constant voltage charging protection is realized.
3. Because the output of the low dropout regulator LDO is directly connected with a battery or a capacitor to be charged, the output voltage Vout of the low dropout regulator LDO is the same as the voltage of the battery or the capacitor, and is lower than the output voltage V of the low dropout regulator LDO set by a feedback resistor at the initial charging stage, the LDO works in an abnormal state at the moment;
4. when the low dropout regulator LDO works normally, the output voltage is equal to the voltage set by the feedback resistor, when the load changes, the output voltage can generate weak change instantly, at the moment, the change is introduced into an error amplifier in the low dropout regulator LDO by the feedback resistor, the voltage at two ends of the error amplifier is always equal by the error amplifier, so that the conduction current of an internal adjusting tube is adjusted, and the output voltage is maintained at the set voltage;
5. the LDO works in an abnormal state in the method, and the set output voltage of the LDO is the highest charging voltage (Vc) of a battery or a capacitor. Under the condition of full charge, the voltage of a battery or a capacitor is lower than the highest charging voltage (Vc), so that the voltage of the low dropout regulator LDO is lower than a set voltage, at the moment, an error amplifier inside the low dropout regulator LDO regulates an internal regulating tube to be conducted to an optimal state, but the current cannot be actually increased, and the actual current is controlled by a constant current source circuit at the front stage of the low dropout regulator LDO.
Along with the progress of charging, the voltage of battery or electric capacity rises gradually, and the output voltage of low dropout linear regulator LDO also rises along with gradually, and when the output voltage of low dropout linear regulator LDO reached the settlement voltage, the output voltage of LDO will maintain invariably no longer to rise to with the setting output voltage of charging voltage invariant at low dropout linear regulator LDO, realize the effect of constant voltage, thereby protection battery or electric capacity can not be in the state of excessive pressure.
6. Calculating the minimum voltage difference Vdrop of the low dropout regulator LDO, wherein the final charging voltage of a battery or a capacitor to be charged is Vc: the input voltage Vin is at least greater than Vc + Vdrop + V constant min, wherein V constant min represents the minimum divided voltage of the constant current source circuit; in actual design, the input voltage Vin is greater than Vc + Vdrop + V for constant min, and a certain margin is left.
The utility model discloses a simple constant current source circuit realizes the constant current function, adds an LDO and realizes the constant voltage function again, and LDO is the work under the very large-scale formula simultaneously (non-constant voltage in the charging process, constant voltage when charging. The conventional usage of LDO is to set a fixed voltage, and input enough energy to make LDO maintain the fixed voltage output to drive the load. And the utility model discloses a working process before reaching the settlement voltage of LDO used, in the charging process, because the utility model discloses the preceding stage has adopted constant current source circuit for LDO is in the operating condition that input voltage is not enough (can not export settlement voltage), utilizes LDO's linear power supply and low pressure drop's characteristic simultaneously, and both the holding current is unanimous with constant current source circuit, can export the voltage that slightly reduces than input voltage again and be used for the back level to charge. When the output voltage and the input voltage of the LDO rise along with the rise of the voltage of a battery or a capacitor at the later stage until the output voltage reaches the set voltage, the charging is cut off. The utility model discloses can realize milliampere level and charge, simple reliable effective, usable simple device is built and is formed, need not go moreover to look for special charging chip.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A constant voltage and constant current charging device applied to a low power consumption environment is characterized by comprising:
the device comprises a power supply anode, a constant current source circuit, a low dropout regulator (LDO), a battery to be charged and a power supply cathode which are connected in sequence;
the connection point between the constant current source circuit and the low dropout regulator LDO is connected with the negative pole of the power supply through an input capacitor C1;
the connection point between the low dropout regulator LDO and the battery to be charged is connected with the negative electrode of the power supply through a capacitor C2;
the connection point between the LDO and the battery to be charged is also connected with the negative electrode of the power supply through a feedback resistor R1 and a feedback resistor R2 which are connected in series;
and the connection point between the feedback resistor R1 and the feedback resistor R2 is connected with the positive input end of an error amplifier of the LDO.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922371633.4U CN211579629U (en) | 2019-12-24 | 2019-12-24 | Constant voltage and constant current charging device applied to low-power-consumption environment |
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| CN201922371633.4U CN211579629U (en) | 2019-12-24 | 2019-12-24 | Constant voltage and constant current charging device applied to low-power-consumption environment |
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| CN211579629U true CN211579629U (en) | 2020-09-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994738A (en) * | 2019-12-24 | 2020-04-10 | 山东康威通信技术股份有限公司 | Constant-voltage constant-current charging device and charging method applied to low-power-consumption environment |
| CN113328504A (en) * | 2021-08-02 | 2021-08-31 | 深圳英集芯科技股份有限公司 | Wireless earphone charging circuit and charging box |
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2019
- 2019-12-24 CN CN201922371633.4U patent/CN211579629U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994738A (en) * | 2019-12-24 | 2020-04-10 | 山东康威通信技术股份有限公司 | Constant-voltage constant-current charging device and charging method applied to low-power-consumption environment |
| CN113328504A (en) * | 2021-08-02 | 2021-08-31 | 深圳英集芯科技股份有限公司 | Wireless earphone charging circuit and charging box |
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Address after: A203, block F-1, Qilu Software Park, No.1 Shunhua Road, high tech Development Zone, Jinan City, Shandong Province Patentee after: Conway Communication Technology Co., Ltd Address before: A203, block F-1, Qilu Software Park, No.1 Shunhua Road, high tech Development Zone, Jinan City, Shandong Province Patentee before: SHANDONG KANGWEI COMMUNICATION TECHNOLOGY Co.,Ltd. |
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