CN219801948U - Charging protection circuit and charging box - Google Patents
Charging protection circuit and charging box Download PDFInfo
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- CN219801948U CN219801948U CN202321192875.7U CN202321192875U CN219801948U CN 219801948 U CN219801948 U CN 219801948U CN 202321192875 U CN202321192875 U CN 202321192875U CN 219801948 U CN219801948 U CN 219801948U
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Abstract
The utility model discloses a charging protection circuit and a charging box, and relates to the technical field of power supply charging. Wherein, the protection circuit that charges includes: the device comprises a voltage detection module, a current detection module, a temperature detection module, a control chip and a switch control module. The voltage detection module detects the voltage value of an external power supply, the current detection module detects the current value of the energy storage battery, and the temperature detection module detects the temperature value of the charging box. The control chip respectively judges whether any one of the obtained voltage value, the current value and the temperature value exceeds a preset threshold value, if so, the control chip generates a first switch control signal, and the switch control module disconnects the external power supply from the energy storage battery according to the first switch control signal, namely, the external power supply stops charging the energy storage battery. The charging protection circuit of the embodiment can realize charging protection for the charging box.
Description
Technical Field
The utility model relates to the technical field of power supply charging, in particular to a charging protection circuit and a charging box.
Background
In the related art, the charging box can charge the energy storage batteries of a plurality of unmanned aerial vehicles simultaneously to this charging efficiency who improves unmanned aerial vehicle energy storage batteries. However, the charging box is easy to generate high temperature, high current and the like during charging, so that a circuit board in the charging box is damaged, and potential safety hazards exist. Therefore, how to charge and protect the charging box is a technical problem to be solved.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a charging protection circuit which can conduct charging protection on a charging box.
The utility model further provides a charging box with the charging protection circuit.
The charging protection circuit according to the embodiment of the first aspect of the utility model is applied to a charging box, and the charging box is used for accommodating an energy storage battery; the charge protection circuit includes:
the voltage detection module is used for being electrically connected with an external power supply and generating a voltage detection signal; the external power supply is used for providing a power supply signal, and the energy storage battery is used for carrying out charging operation according to the power supply signal;
the current detection module is used for being electrically connected with the energy storage battery and generating a current detection signal;
the temperature detection module is arranged in the charging box and is used for generating a temperature detection signal;
the control chip is used for generating a voltage judgment result according to the voltage detection signal and a preset voltage threshold value, generating a current judgment result according to the current detection signal and a preset current threshold value, generating a temperature judgment result according to the temperature detection signal and a preset temperature threshold value, and generating a first switch control signal according to the voltage judgment result, the current judgment result and the temperature judgment result;
the switch control module is used for being respectively and electrically connected with the external power supply, the control chip and the energy storage battery, and the switch control module is used for controlling the connection state of the external power supply and the energy storage battery according to the first switch control signal.
The charging protection circuit provided by the embodiment of the utility model has at least the following beneficial effects: the voltage detection module detects the voltage value of an external power supply, the current detection module detects the current value of the energy storage battery, and the temperature detection module detects the temperature value of the charging box. The control chip respectively judges whether any one of the obtained voltage value, the current value and the temperature value exceeds a preset threshold value, if so, the control chip generates a first switch control signal, and the switch control module disconnects the external power supply from the energy storage battery according to the first switch control signal, namely, the external power supply stops charging the energy storage battery. The charging protection circuit of the embodiment can detect the voltage state, the current state and the temperature state of the charging box in real time, and when any state is abnormal, the external power supply is turned off to charge the energy storage battery, so that the charging protection of the charging box is realized.
According to some embodiments of the utility model, the voltage detection module comprises:
one end of the first resistor is used for being electrically connected with the external power supply, and the other end of the first resistor is used for being electrically connected with a voltage sampling port of the control chip;
and one end of the second resistor is used for being electrically connected with the first resistor and the connecting node of the control chip, and the other end of the second resistor is grounded.
According to some embodiments of the utility model, the temperature detection module comprises:
the thermistor is arranged in the charging box, one end of the thermistor is electrically connected with the temperature sampling port of the control chip, and the other end of the thermistor is grounded;
one end of the voltage dividing resistor is electrically connected with a constant voltage power supply, and the other end of the voltage dividing resistor is electrically connected with the connecting nodes of the control chip and the thermistor respectively; the constant voltage power supply is used for providing a constant voltage signal, and the thermistor is used for generating the temperature detection signal according to the temperature parameter of the charging box and the constant voltage signal.
According to some embodiments of the utility model, the current detection module comprises:
one end of the third resistor is used for being electrically connected with the energy storage battery, the other end of the third resistor is grounded, and the third resistor is used for generating the current detection signal according to the output signal of the energy storage battery;
the input end of the power amplifier is used for being electrically connected with the connection node of the energy storage battery and the third resistor, the output end of the power amplifier is used for being electrically connected with the current sampling port of the control chip, and the power amplifier is used for amplifying the current detection signal.
According to some embodiments of the utility model, the switch control module comprises:
the base electrode of the voltage control flow element is electrically connected with the control port of the control chip, the emitter electrode of the voltage control flow element is grounded, and the voltage control flow element is used for being turned on or turned off according to the first switch control signal;
the normally open contact of the relay is used for being electrically connected with the external power supply, the common end of the relay is used for being electrically connected with the energy storage battery, the coil of the relay is used for being electrically connected with the collector electrode of the voltage-controlled current element, and the relay is used for controlling the connection state of the external power supply and the energy storage battery according to the conduction state of the voltage-controlled current element.
According to some embodiments of the utility model, the switch control module further comprises:
the switch unit is grounded at one end and is used for generating a touch signal;
the cathode of the diode is electrically connected with one end of the switch unit, the first anode of the diode is electrically connected with the connection node of the voltage-controlled current element and the relay, and the second anode of the diode is electrically connected with the control chip and the constant voltage power supply respectively;
the control chip is used for generating a second switch control signal according to the touch control signal and a preset duration threshold value, and the voltage-control flow element is used for being switched on or off according to the second switch control signal.
According to some embodiments of the utility model, the charge protection circuit further comprises:
the voltage reducing module is used for being respectively and electrically connected with the external power supply, the temperature detecting module and the switch control module, and the voltage reducing module is used for carrying out voltage reducing operation on the power supply signal to obtain a constant voltage signal.
According to a second aspect of the present utility model, a charging box includes:
the charge protection circuit according to the embodiment of the first aspect of the present utility model.
The charging box provided by the embodiment of the utility model has at least the following beneficial effects: the charging box realizes real-time detection of the voltage state, the current state and the temperature state of the charging box by adopting the charging protection circuit, and can cut off the charging of the external power supply to the energy storage battery when any state is abnormal, so that the charging protection to the charging box is realized.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The utility model is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of a charge protection circuit according to one embodiment of the present utility model;
FIG. 2 is a schematic circuit diagram of a voltage detection module according to an embodiment of the present utility model;
FIG. 3 is a schematic circuit diagram of a control chip according to an embodiment of the present utility model;
FIG. 4 is a schematic circuit diagram of a temperature detection module according to an embodiment of the present utility model;
FIG. 5 is a schematic circuit diagram of a current detection module according to an embodiment of the present utility model;
FIG. 6 is a schematic circuit diagram of an embodiment of a switch control module according to the present utility model;
fig. 7 is a schematic circuit diagram of a buck module according to an embodiment of the utility model.
Reference numerals:
the energy storage battery 100, the voltage detection module 200, the current detection module 300, the temperature detection module 400, the control chip 500, the switch control module 600, the switch unit 610, the external power supply 700, and the voltage reduction module 800.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, mounting, connection, electrical 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 solution.
In the description of the present utility model, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the related art, the charging box can charge the energy storage batteries of a plurality of unmanned aerial vehicles simultaneously to this charging efficiency who improves unmanned aerial vehicle energy storage batteries. However, the unmanned aerial vehicle charging box is easy to appear conditions such as high temperature, high current when charging to cause the damage of circuit board in the charging box, there is the potential safety hazard simultaneously. Therefore, how to charge and protect the charging box is a technical problem to be solved.
Based on the above, the embodiment of the utility model provides a charging protection circuit and a charging box, which can perform charging protection on the charging box.
As shown in fig. 1, an embodiment of the present utility model provides a charging protection circuit applied to a charging box for accommodating an energy storage battery 100. The charge protection circuit includes: voltage detection module 200, current detection module 300, temperature detection module 400, control chip 500, and switch control module 600. The voltage detection module 200 is used for being electrically connected with the external power supply 700, the voltage detection module 200 is used for generating a voltage detection signal, the external power supply 700 is used for providing a power supply signal, and the energy storage battery 100 is used for performing charging operation according to the power supply signal; the current detection module 300 is configured to be electrically connected to the energy storage battery 100, and the current detection module 300 is configured to generate a current detection signal; the temperature detection module 400 is arranged in the charging box, and the temperature detection module 400 is used for generating a temperature detection signal; the control chip 500 is configured to be electrically connected to the voltage detection module 200, the current detection module 300, and the temperature detection module 400, respectively, the control chip 500 is configured to generate a voltage judgment result according to the voltage detection signal and a preset voltage threshold, the control chip 500 is configured to generate a current judgment result according to the current detection signal and a preset current threshold, the control chip 500 is configured to generate a temperature judgment result according to the temperature detection signal and a preset temperature threshold, and the control chip 500 is configured to generate a first switch control signal according to the voltage judgment result, the current judgment result, and the temperature judgment result; the switch control module 600 is configured to be electrically connected to the external power supply 700, the control chip 500, and the energy storage battery 100, respectively, and the switch control module 600 is configured to control a connection state of the external power supply 700 and the energy storage battery 100 according to the first switch control signal.
Specifically, the charging box is capable of accommodating the energy storage battery 100, and is electrically connected to the external power supply 700, and outputs a power supply signal provided by the external power supply 700 to the energy storage battery 100, thereby realizing charging of the energy storage battery 100. The energy storage battery 100 is used for providing power for devices such as a drone. The charging box can accommodate a plurality of energy storage batteries 100, and the number of the energy storage batteries 100 can be adjusted according to actual demands.
The voltage detection module 200 is electrically connected to the external power supply 700 and the control chip 500, respectively, and the voltage detection module 200 is capable of detecting a voltage state of the power supply signal and generating a voltage detection signal. The current detection module 300 is electrically connected to the energy storage battery 100 and the control chip 500, respectively, and the current detection module 300 is capable of detecting a current state of the energy storage battery 100 and generating a current detection signal. The temperature detection module 400 is electrically connected with the control chip 500, and the temperature detection module 400 is disposed in the charging box, and the temperature detection module 400 can detect the temperature state of the charging box and generate a temperature detection signal.
The voltage threshold, the current threshold and the temperature threshold are stored in the control chip 500 in advance, and can be set according to actual requirements. After receiving the voltage detection signal, the control chip 500 compares the voltage value of the voltage detection signal with a voltage threshold value, and determines whether the voltage state of the power supply signal is abnormal. For example, if the voltage value of the voltage detection signal is greater than or equal to the voltage threshold value, the voltage judgment result is that the voltage is abnormal; otherwise, the voltage judgment result is that the voltage is normal.
After receiving the current detection signal, the control chip 500 compares the current value of the current detection signal with a current threshold value to determine whether the current state of the energy storage battery 100 is abnormal. For example, if the current value of the current detection signal is greater than or equal to the current threshold value, the current judgment result is that the current is abnormal; if the current value of the current detection signal is smaller than the current threshold value, the current judgment result is that the current is normal.
When the temperature detection signal is received, the control chip 500 compares the temperature value data included in the temperature detection signal with a temperature threshold value, and determines whether the temperature state of the charging box is abnormal. For example, if the temperature value of the temperature detection signal is greater than or equal to the temperature threshold value, the temperature judgment result is that the temperature is abnormal; if the temperature value of the temperature detection signal is smaller than the temperature threshold value, the temperature judgment result is that the temperature is normal.
When any one of the voltage judgment result, the current judgment result and the temperature judgment result shows that the result is abnormal. When any one of the voltage determination result, the current determination result, and the temperature determination result indicates that the result is abnormal, the control chip 500 generates a first switching control signal and receives the first switching control signal by the switching control module 600. The switch control module 600 receives the first switch control signal and turns off the connection between the external power supply 700 and the energy storage battery 100 according to the first switch control signal, thereby stopping the charging of the energy storage battery 100 by the external power supply 700.
According to the charging protection circuit provided by the embodiment of the utility model, the voltage state, the current state and the temperature state can be detected in real time, and when any one state is abnormal, the external power supply 700 is stopped to charge the energy storage battery 100, so that the charging protection of the charging box is realized.
As shown in fig. 2, in some embodiments of the utility model, the voltage detection module 200 includes: a first resistor R1 and a second resistor R2. One end of the first resistor R1 is used for being electrically connected with the external power supply 700, and the other end of the first resistor R1 is used for being electrically connected with a voltage sampling port of the control chip 500; one end of the second resistor R2 is electrically connected to the connection node between the first resistor R1 and the control chip 500, and the other end of the second resistor R2 is grounded.
Specifically, the external power supply 700, the first resistor R1, the second resistor R2, and the ground are sequentially connected in series, and the connection node of the first resistor R1 and the second resistor R2 is electrically connected to the voltage sampling port of the control chip 500 (e.g. the "PAO4" pin of the control chip 500 in fig. 3). The first resistor R1 and the second resistor R2 are both used for dividing the power supply signal provided by the external power supply 700. After the first resistor R1 and the second resistor R2 complete the voltage division of the power supply signal, the connection node of the first resistor R1 and the second resistor R2 generates a signal with stable voltage, and the signal is a voltage detection signal. The control chip 500 receives the voltage detection signal through the voltage sampling port and compares the voltage value of the voltage detection signal with a voltage threshold value, thereby judging whether the voltage state of the power supply signal is abnormal.
As shown in fig. 4, in some embodiments of the utility model, the temperature detection module 400 includes: thermistor, divider resistor. The thermistor is arranged in the charging box, one end of the thermistor is electrically connected with the temperature sampling port of the control chip 500, and the other end of the thermistor is grounded; one end of the voltage dividing resistor is used for being electrically connected with a constant voltage power supply, the other end of the voltage dividing resistor is used for being electrically connected with a connecting node of the control chip 500 and the thermistor respectively, the constant voltage power supply is used for providing a constant voltage signal, and the thermistor is used for generating a temperature detection signal according to the temperature parameter of the charging box and the constant voltage signal.
Specifically, the constant voltage power supply, the voltage dividing resistor, the thermistor and the ground terminal are sequentially connected in series, and the connection node of the thermistor and the voltage dividing resistor is electrically connected with the current sampling port of the control chip 500. A plurality of temperature detection modules 400 can be arranged in the charging protection circuit, and each temperature detection module 400 comprises a voltage dividing resistor and a thermistor. For example, referring to fig. 3 and 4, four temperature detection modules 400 may be disposed in the charge protection circuit, where each temperature detection module 400 includes a voltage dividing resistor (such as resistors R01, R02, R03, and R04 in fig. 4) and a thermistor (such as resistors RT1, RT2, RT3, and RT4 in fig. 4), and each temperature detection module 400 is electrically connected to a current sampling port of the control chip 500 (such as pins "PA05", "PA06", "PA07", and "PB00" in the control chip 500 in fig. 3). The position of the thermistor arranged in the charging box can be adjusted according to requirements. The thermistor and the voltage dividing resistor can divide the constant voltage signal provided by the constant voltage power supply. The change of the temperature state of the charging box can change the resistance value of the thermistor, namely the voltage dividing capacity of the thermistor, so that the potential of a connecting node of the thermistor and the voltage dividing resistor is changed, and a temperature detection signal is generated. The control chip 500 receives the temperature detection signal through the temperature sampling port, and compares the temperature value data included in the temperature detection signal with a temperature threshold value, thereby judging whether the temperature state of the charging box is abnormal.
As shown in fig. 5, in some embodiments of the utility model, the current detection module 300 includes: a third resistor R3 and a power amplifier U2. One end of the third resistor R3 is used for being electrically connected with the energy storage battery 100, the other end of the third resistor R3 is grounded, and the third resistor R3 is used for generating a current detection signal according to an output signal of the energy storage battery 100; the input end of the power amplifier U2 is used for being electrically connected with the connection node of the energy storage battery 100 and the third resistor R3, the output end of the power amplifier U2 is used for being electrically connected with the current sampling port of the control chip 500, and the power amplifier U2 is used for amplifying the current detection signal.
Specifically, the output end of the energy storage battery 100, the power amplifier U2, and the current detection port of the control chip 500 (e.g. the "PB11" pin of the control chip 500 in fig. 3) are sequentially connected in series, one end of the third resistor R3 is electrically connected to the output end of the energy storage battery 100 and the power amplifier U2, and the other end of the third resistor R3 is grounded. The energy storage battery 100 generates an output signal from the output terminal IN real time IN a charged state, the third resistor R3 converts the output signal IN a current form into a current detection signal with extremely small voltage, and the current detection signal is received by the receiving terminal of the power amplifier U2 (e.g., the "+in" pin of the power amplifier U2 IN fig. 5). The power amplifier U2 performs a power amplifying operation on the current detection signal, thereby making a current change of the current detection signal easier to be recognized by the control chip 500. After completing the power amplifying operation, the power amplifier U2 OUTPUTs the power amplified current detection signal from an OUTPUT terminal (e.g., the OUTPUT pin of the power amplifier U2 of fig. 5). The control chip 500 receives the current detection signal through the current sampling port and compares the current value included in the current detection signal with the current threshold value, thereby judging whether the current state of the energy storage battery 100 is abnormal.
As shown in fig. 6, in some embodiments of the utility model, the switch control module 600 includes: a pressure-controlled flow element Q1 and a relay RL1. The base electrode of the voltage-controlled current element Q1 is electrically connected with the control port of the control chip 500, the emitter electrode of the voltage-controlled current element Q1 is grounded, and the voltage-controlled current element Q1 is turned on or turned off according to a first switch control signal; the normally open contact of the relay RL1 is used for being electrically connected with the external power supply 700, the common end of the relay RL1 is used for being electrically connected with the energy storage battery 100, the coil of the relay RL1 is used for being electrically connected with the collector of the voltage-controlled current element Q1, and the relay RL1 is used for controlling the connection state of the external power supply 700 and the energy storage battery 100 according to the conduction state of the voltage-controlled current element Q1.
Specifically, one end of the coil of the relay RL1 is electrically connected to the energy storage battery 100 and the common end of the relay RL1, the other end of the coil of the relay RL1 is electrically connected to the collector of the voltage-controlled current element Q1, the external power supply 700 is electrically connected to the normally open contact of the relay RL1, and the control port (e.g., the "PB03" pin of the control chip 500 in fig. 3) of the control chip 500 is electrically connected to the base of the voltage-controlled current element Q1. When the control chip 500 does not detect an abnormality, the control chip 500 generates a first switching control signal of a high level to set the base level of the voltage-controlled current element Q1 high, so that the voltage-controlled current element Q1 is turned on. At this time, the coil of the relay RL1 corresponds to direct grounding, so that the normally open contact of the relay RL1 and the common terminal of the relay RL1 maintain a closed state, thereby enabling the external power supply 700 to charge the energy storage battery 100. When the control chip 500 detects an abnormality, the control chip 500 generates a first switching control signal of a low level, and the base level of the voltage-controlled current element Q1 is set low, so that the voltage-controlled current element Q1 is turned off. At this time, the connection node between one end of the coil of the relay RL1 and the voltage-controlled current element Q1 becomes a high level, so that the normally open contact of the relay RL1 and the common end of the relay RL1 are switched to an off state, thereby disconnecting the external power supply 700 from the energy storage battery 100, and further stopping the external power supply 700 from charging the energy storage battery 100.
As shown in fig. 6, in some embodiments of the utility model, the switch control module 600 further includes: a switching unit 610, and a diode D1. One end of the switch unit 610 is grounded, and the switch unit 610 is used for generating a touch signal; the cathode of the diode D1 is electrically connected to one end of the switching unit 610, the first anode of the diode D1 is electrically connected to the connection node of the voltage-controlled current element Q1 and the relay RL1, and the second anode of the diode D1 is electrically connected to the control chip 500 and the constant voltage power supply, respectively; the control chip 500 is configured to generate a second switch control signal according to the touch signal and a preset duration threshold, and the voltage-controlled current element Q1 is configured to be turned on or off according to the second switch control signal.
Specifically, the switching unit 610 is electrically connected to the ground terminal and the cathode of the diode D1, the connection node between the collector of the voltage-controlled current element Q1 and the coil of the relay RL1 is electrically connected to the first anode of the diode D1, and the switch detection port (e.g., the "PA15" pin of the control chip 500 in fig. 3) of the control chip 500 is electrically connected to the second anode of the diode D1.
Referring to fig. 6, the switching unit 610 may be selected as a key switch SW1. The initial state of the charging box is set to be a shutdown state, and at this time, the relay RL1 disconnects the external power supply 700 from the energy storage battery 100. When the switch unit 610 is pressed to be closed, the cathode of the diode D1 is equivalent to direct grounding, that is, the switch unit 610 generates a low-level touch signal, so that the diode D1 is turned on. After the diode D1 is turned on, the coil of the relay RL1 receives the low-level signal, so that the normally open contact of the relay RL1 and the common terminal of the relay RL1 are switched to be in a closed state, and at this time, the external power supply 700 can charge the energy storage battery 100. Meanwhile, the switch detection port of the control chip 500 receives the low-level signal, and at this time, the control chip 500 generates a high-level second switch control signal, and continuously outputs the second switch control signal from the control port of the control chip 500 (such as the "PB03" pin of the control chip 500 in fig. 3) to the base of the voltage-controlled current element Q1, so that the voltage-controlled current element Q1 maintains a conductive state. At this time, the relay RL1 coil can receive a low level signal and maintain the connection of the external power source 700 and the energy storage battery 100, regardless of whether the switching unit 610 is closed, thereby starting the charging operation of the charging box.
After the charging box is opened and charged, if the switch unit 610 is closed again, the switch detection port of the control chip 500 receives a low-level touch signal (falling edge of the touch signal), and the control chip 500 detects whether the duration of the low-level touch signal reaches the preset duration threshold. When the duration of the touch signal is greater than or equal to the preset duration threshold, the control chip 500 generates a low-level second switch control signal, so that the base level of the voltage-controlled current element Q1 is set low, and the voltage-controlled current element Q1 is turned off. After the voltage-controlled current element Q1 is turned off, the level of the coil of the relay RL1 is set high, so that the connection between the external power supply 700 and the energy storage battery 100 is disconnected, and the function of manually turning off the charging operation of the charging box is realized.
As shown in fig. 7, in some embodiments of the present utility model, the charge protection circuit further includes a buck module 800. The voltage reducing module 800 is configured to be electrically connected to the external power supply 700, the temperature detecting module 400, and the switch control module 600, respectively, and the voltage reducing module 800 is configured to perform voltage reducing operation on the power supply signal to obtain a constant voltage signal.
Specifically, the external power supply 700 is electrically connected to the voltage reducing module 800, and the temperature detecting module 400 and the switch control module 600 are electrically connected to the voltage reducing module 800. The voltage reducing module 800 includes a voltage reducing chip U3, and after receiving the power supply signal provided by the external power supply 700, the voltage reducing chip U3 performs a voltage reducing operation on the power supply signal to obtain a constant voltage signal, which is the same as the constant voltage signal described in the above embodiment, that is, the external power supply 700 and the voltage reducing module 800 are combined with a constant voltage power supply corresponding to the above embodiment. For example, the external power supply 700 provides a 12V power supply signal, and the step-down module 800 performs a step-down operation on the power supply signal to obtain a constant voltage signal of 3.3V. It is understood that the voltage value of the voltage step-down module 800 for specifically performing voltage step-down can be adjusted according to actual requirements.
The embodiment of the utility model also provides a charging box, and the power supply conversion system comprises the charging protection circuit described in any embodiment.
Specifically, the charging box may house a plurality of energy storage batteries. When the energy storage batteries of the unmanned aerial vehicle all need to be charged, the energy storage batteries can be placed in the charging box and charged through the charging box.
Therefore, the contents of the above-mentioned charging protection circuit embodiment are all applicable to the embodiment of the charging box, and the functions of the embodiment of the charging box are the same as those of the embodiment of the charging protection circuit, and the beneficial effects achieved by the embodiment of the charging protection circuit are the same as those achieved by the embodiment of the charging protection circuit.
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. Furthermore, embodiments of the utility model and features of the embodiments may be combined with each other without conflict.
Claims (8)
1. The charging protection circuit is characterized by being applied to a charging box, and the charging box is used for accommodating an energy storage battery; the charge protection circuit includes:
the voltage detection module is used for being electrically connected with an external power supply and generating a voltage detection signal; the external power supply is used for providing a power supply signal, and the energy storage battery is used for carrying out charging operation according to the power supply signal;
the current detection module is used for being electrically connected with the energy storage battery and generating a current detection signal;
the temperature detection module is arranged in the charging box and is used for generating a temperature detection signal;
the control chip is used for generating a voltage judgment result according to the voltage detection signal and a preset voltage threshold value, generating a current judgment result according to the current detection signal and a preset current threshold value, generating a temperature judgment result according to the temperature detection signal and a preset temperature threshold value, and generating a first switch control signal according to the voltage judgment result, the current judgment result and the temperature judgment result;
the switch control module is used for being respectively and electrically connected with the external power supply, the control chip and the energy storage battery, and the switch control module is used for controlling the connection state of the external power supply and the energy storage battery according to the first switch control signal.
2. The charge protection circuit of claim 1, wherein the voltage detection module comprises:
one end of the first resistor is used for being electrically connected with the external power supply, and the other end of the first resistor is used for being electrically connected with a voltage sampling port of the control chip;
and one end of the second resistor is used for being electrically connected with the first resistor and the connecting node of the control chip, and the other end of the second resistor is grounded.
3. The charge protection circuit of claim 2, wherein the temperature detection module comprises:
the thermistor is arranged in the charging box, one end of the thermistor is electrically connected with the temperature sampling port of the control chip, and the other end of the thermistor is grounded;
one end of the voltage dividing resistor is electrically connected with a constant voltage power supply, and the other end of the voltage dividing resistor is electrically connected with the connecting nodes of the control chip and the thermistor respectively; the constant voltage power supply is used for providing a constant voltage signal, and the thermistor is used for generating the temperature detection signal according to the temperature parameter of the charging box and the constant voltage signal.
4. A charge protection circuit according to claim 3, wherein the current detection module comprises:
one end of the third resistor is used for being electrically connected with the energy storage battery, the other end of the third resistor is grounded, and the third resistor is used for generating the current detection signal according to the output signal of the energy storage battery;
the input end of the power amplifier is used for being electrically connected with the connection node of the energy storage battery and the third resistor, the output end of the power amplifier is used for being electrically connected with the current sampling port of the control chip, and the power amplifier is used for amplifying the current detection signal.
5. The charge protection circuit of claim 4, wherein the switch control module comprises:
the base electrode of the voltage control flow element is electrically connected with the control port of the control chip, the emitter electrode of the voltage control flow element is grounded, and the voltage control flow element is used for being turned on or turned off according to the first switch control signal;
the normally open contact of the relay is used for being electrically connected with the external power supply, the common end of the relay is used for being electrically connected with the energy storage battery, the coil of the relay is used for being electrically connected with the collector electrode of the voltage-controlled current element, and the relay is used for controlling the connection state of the external power supply and the energy storage battery according to the conduction state of the voltage-controlled current element.
6. The charge protection circuit of claim 5, wherein the switch control module further comprises:
the switch unit is grounded at one end and is used for generating a touch signal;
the cathode of the diode is electrically connected with one end of the switch unit, the first anode of the diode is electrically connected with the connection node of the voltage-controlled current element and the relay, and the second anode of the diode is electrically connected with the control chip and the constant voltage power supply respectively;
the control chip is used for generating a second switch control signal according to the touch control signal and a preset duration threshold value, and the voltage-control flow element is used for being switched on or off according to the second switch control signal.
7. The charge protection circuit according to any one of claims 1 to 6, further comprising:
the voltage reducing module is used for being respectively and electrically connected with the external power supply, the temperature detecting module and the switch control module, and the voltage reducing module is used for carrying out voltage reducing operation on the power supply signal to obtain a constant voltage signal.
8. Charging box, its characterized in that includes:
the charge protection circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321192875.7U CN219801948U (en) | 2023-05-16 | 2023-05-16 | Charging protection circuit and charging box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321192875.7U CN219801948U (en) | 2023-05-16 | 2023-05-16 | Charging protection circuit and charging box |
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| Publication Number | Publication Date |
|---|---|
| CN219801948U true CN219801948U (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321192875.7U Active CN219801948U (en) | 2023-05-16 | 2023-05-16 | Charging protection circuit and charging box |
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| Country | Link |
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| CN (1) | CN219801948U (en) |
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2023
- 2023-05-16 CN CN202321192875.7U patent/CN219801948U/en active Active
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