CN211908390U - Charging safety circuit, charging seat, charging device and display device - Google Patents
Charging safety circuit, charging seat, charging device and display device Download PDFInfo
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- CN211908390U CN211908390U CN202020001812.9U CN202020001812U CN211908390U CN 211908390 U CN211908390 U CN 211908390U CN 202020001812 U CN202020001812 U CN 202020001812U CN 211908390 U CN211908390 U CN 211908390U
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Abstract
The utility model relates to a safety circuit, charging seat, charging device and display device charge, this safety circuit that charges, a serial communication port, include: a control sub-circuit; the first electrode subcircuit and the second electrode subcircuit are respectively and electrically connected with the control subcircuit; in a first state, the control sub-circuit responds to a received first driving signal to respectively control the output end of the first electrode sub-circuit to output a power supply positive voltage and the output end of the second electrode sub-circuit to output a power supply negative voltage; in a second state, the control sub-circuit responds to the received second driving signal to respectively control the output end of the first electrode sub-circuit to output the negative voltage of the power supply, and the output end of the second electrode sub-circuit to output the positive voltage of the power supply. The utility model discloses can improve the security that the device charges, prevent that the condition of burning out from appearing in the device.
Description
Technical Field
The utility model relates to a show technical field. And more particularly, to a charging safety circuit, a charging stand, a charging device, and a display device.
Background
Currently, many display devices are provided with an automatic charging device, such as a display device for a picture screen, etc., which is provided with a rechargeable power supply, and an automatic charging device capable of automatically winding and unwinding a wire and a charging head for electrical connection, so as to automatically charge a rechargeable battery.
Automatic charging device is carrying out the during operation, when chargeable power need charge, automatic charging device will charge the head and transfer, so that the connector falls to the charging seat on, charge overhead charging electrode and the power supply electrode of charging seat and carry out corresponding electricity and connect and carry out corresponding charging process, however, when charging the head at the in-process of transferring, if lead to its unexpected upset because of external force factor, when making charge overhead falling to the charging seat on, the overhead charging electrode that charges can take place the condition of transposition with the power supply electrode of charging seat, thereby lead to the condition that the device burns out probably to appear.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that proposes in the background art, the utility model discloses the first aspect provides a safety circuit charges, include:
a control sub-circuit; and
the first electrode subcircuit and the second electrode subcircuit are respectively and electrically connected with the control subcircuit;
wherein,
in a first state, the control sub-circuit responds to a received first driving signal to respectively control the output end of the first electrode sub-circuit to output a power supply positive voltage and the output end of the second electrode sub-circuit to output a power supply negative voltage;
in a second state, the control sub-circuit responds to the received second driving signal to respectively control the output end of the first electrode sub-circuit to output the negative voltage of the power supply, and the output end of the second electrode sub-circuit to output the positive voltage of the power supply.
Optionally, the control sub-circuit comprises:
and a first end of the control unit is used for receiving the first driving signal or the second driving signal, a second end of the control unit is electrically connected with the input end of the first electrode sub-circuit, and a third end of the control unit is electrically connected with the input end of the second electrode sub-circuit.
Optionally, the first electrode sub-circuit comprises:
the type is a first chip of IR2104, a VCC pin of the first chip receives a power supply voltage, an IN pin of the first chip is electrically connected with a second end of the control unit, and an SD pin of the first chip receives a turn-off voltage; receiving a ground voltage by a COM pin of the first chip;
a first diode, an anode of which receives the power supply voltage, and a cathode of which is electrically connected with a VB pin of the first chip;
a first resistor having a first end electrically connected to a HO pin of the first chip;
a first capacitor having a first terminal electrically connected to a VB pin of the first chip and a second terminal electrically connected to a first terminal of the first resistor;
a first switch element, a control terminal of which is electrically connected to the second terminal of the first resistor, a first terminal of which is electrically connected to the VS pin of the first chip, and a second terminal of which is electrically connected to the output terminal of the first electrode sub-circuit;
a second diode, an anode of which is electrically connected to the first terminal of the first switching element, and a cathode of which is electrically connected to the output terminal of the first electrode sub-circuit;
a second resistor having a first end electrically connected to the LO pin of the first chip;
a second switching element, a control terminal of the second switching element being electrically connected to a second terminal of the second resistor, a first terminal of the second switching element receiving a ground voltage, a second terminal of the second switching element being electrically connected to the first terminal of the first switching element;
a third diode having an anode electrically connected to the second terminal of the second switching element and a cathode electrically connected to the anode of the second diode;
and a first end of the second capacitor is electrically connected with the SD pin of the first chip, and a second end of the second capacitor is electrically connected with the COM pin of the first chip.
Optionally, the second electrode sub-circuit comprises:
a VCC pin of the second chip receives a power supply voltage, an IN pin of the second chip is electrically connected with a third end of the control unit, and an SD pin of the second chip receives a turn-off voltage; receiving a ground voltage by a COM pin of the first chip;
a fourth diode, an anode of which receives the power voltage, and a cathode of which is electrically connected to a VB pin of the second chip;
a third resistor, a first end of the third resistor being electrically connected with the HO pin of the second chip;
a third capacitor, a first end of the third capacitor being electrically connected to the VB pin of the second chip, a second end of the third capacitor being electrically connected to the first end of the third resistor;
a control terminal of the third switching element is electrically connected with a second terminal of the third resistor, a first terminal of the third switching element is electrically connected with the VS pin of the second chip, and a second terminal of the third switching element is electrically connected with an output terminal of the second electrode sub-circuit;
an anode of the fifth diode is electrically connected with the first end of the third switching element, and a cathode of the fifth diode is electrically connected with the output end of the second electrode sub-circuit;
a fourth resistor having a first end electrically connected to the LO pin of the second chip;
a fourth switching element, a control terminal of the fourth switching element being electrically connected to a second terminal of the fourth resistor, a first terminal of the fourth switching element receiving a ground voltage, a second terminal of the fourth switching element being electrically connected to a first terminal of the third switching element;
and an anode of the sixth diode is electrically connected to the second terminal of the fourth switching element, and a cathode of the sixth diode is electrically connected to an anode of the fourth diode.
A first end of the fourth capacitor is electrically connected with the SD pin of the second chip, and a second end of the fourth capacitor is electrically connected with the COM pin of the second chip.
Optionally, a power supply sub-circuit for supplying power to the first electrode sub-circuit and the second electrode sub-circuit is further included.
The utility model discloses the second aspect provides a charging seat, include:
a first housing;
the first power supply electrode and the second power supply electrode are arranged on the first shell; and
a charging safety circuit as set forth in the first aspect of the present invention disposed in the first housing;
wherein the first supply electrode corresponds to an output of the first electrode sub-circuit and the second supply electrode corresponds to an output of the second electrode sub-circuit.
The utility model discloses the third aspect provides a charging device, include:
the charging stand according to the second aspect of the present invention; and
and the charging head is matched with the charging seat.
Optionally, the charging head comprises:
a second housing;
the first charging electrode and the second charging electrode are arranged on the second shell; and
a magnet disposed on the second housing;
the first shell is provided with a magnetic sensor, the magnetic sensor responds to whether the magnetic force of the magnet is sensed to send a first driving signal or a second driving signal to the control sub-circuit, the control sub-circuit responds to the received first driving signal to respectively control the output end of the first electrode sub-circuit to output power supply positive voltage and the output end of the second electrode sub-circuit to output power supply negative voltage, the control sub-circuit responds to the received second driving signal to respectively control the output end of the first electrode sub-circuit to output power supply negative voltage, and the output end of the second electrode sub-circuit outputs power supply positive voltage.
Optionally, the method further comprises:
the controller is used for sending a charging signal to the control sub-circuit;
wherein the control sub-circuit receives the first drive signal or the second drive signal in response to the charging signal.
Optionally, the controller is further configured to send a charge stop signal to the control sub-circuit, and the control sub-circuit controls the output terminal of the first electrode sub-circuit to output a ground voltage and the output terminal of the second electrode sub-circuit to output a ground voltage in response to the charge stop signal, respectively.
The utility model discloses a fourth aspect provides a display device, include:
a display screen;
the power supply is used for supplying power to the display screen; and
the utility model discloses the third aspect provides charging device, charging device is used for right the power charges.
Optionally, the display screen is an electronic painted screen.
The utility model has the advantages as follows:
the utility model has the advantages of the principle is clear and definite, the design is simple, can be according to being in the condition of just connecing or the transposition between the charging electrode of the head that charges and the power supply electrode of charging seat, the positive and negative voltage of the power that charging electrode that the power supply electrode output of automatic adjustment charging seat and looks electricity are connected corresponds for accomplish the work of charging between charging seat and the head that charges, improve the security that the device charges, prevent that the device from appearing the condition of burning out.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 shows a block diagram of a charging safety circuit according to an embodiment of the present invention.
Fig. 2 shows a circuit diagram of a first electrode sub-circuit in the present embodiment;
fig. 3 shows a circuit diagram of a second electrode sub-circuit in the present embodiment;
fig. 4 shows a circuit diagram of a power supply sub-circuit in the present embodiment;
fig. 5 is a schematic structural diagram of a charging stand according to another embodiment of the present invention;
fig. 6 is a block diagram showing a charging device according to still another embodiment of the present invention;
fig. 7 shows a schematic configuration diagram of a charging head in the present embodiment;
fig. 8 is a schematic structural view showing the electrode, the wire winding roll and the electrical connector in the present embodiment;
fig. 9 shows a schematic structural view between the magnetic sensor and the control unit in the present embodiment;
fig. 10 is a block diagram showing a display device according to still another embodiment of the present invention.
In the figure: 11. a first housing; 12. a first feeding electrode; 13. a second power supply electrode; 14. a circuit board; 15. a charging slot; 16. a magnetic sensor; 17. a microswitch; 18. an electromagnet; 21. a second housing; 22. a first charging electrode; 23. a second charging electrode; 24. a magnet; 31. a motor; 32. a take-up reel; 33. an electrical connection wire; 41. a control unit.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe the embodiments of the present invention in further detail with reference to the accompanying drawings.
In the prior art, many display devices are provided with automatic charging devices, such as display devices of a picture screen, etc., which are provided with a rechargeable power supply and automatic charging devices capable of automatically winding and unwinding wires and charging heads for electrical connection, so as to realize automatic charging of rechargeable batteries, when the automatic charging devices are in operation, when the rechargeable power supply needs to be charged, the automatic charging devices lower the charging heads to enable a connector to fall onto a charging seat, and the charging electrodes on the charging heads are correspondingly electrically connected with the power supply electrodes of the charging seat to perform corresponding charging processes, however, when the charging heads are lowered, if the charging heads are accidentally turned over due to external force factors, the charging electrodes on the charging heads and the power supply electrodes of the charging seat are reversely connected, leading to a situation where device burn-out may occur.
In order to solve this problem, fig. 1 shows a block diagram of a charging safety circuit according to an embodiment of the present invention, as shown in fig. 1, the charging safety circuit includes a control sub-circuit, and a first electrode sub-circuit and a second electrode sub-circuit electrically connected to the control sub-circuit, respectively.
Specifically, for convenience of description, it is defined that the charging head includes a first charging electrode 22 and a second charging electrode 23, the charging stand includes a first power supply electrode 12 and a second power supply electrode 13, the charging electrode of the charging head is defined to be in a first state when being positively connected to the power supply electrode of the charging stand (the first charging electrode 22 is electrically connected to the first power supply electrode 12, and the second charging electrode 23 is electrically connected to the second power supply electrode 13), and the charging electrode of the charging head is defined to be in a second state when being reversely connected to the power supply electrode of the charging stand (the first charging electrode 22 is electrically connected to the second power supply electrode 13, and the second charging electrode 23 is electrically connected to the first power supply electrode 12).
In this embodiment, when the charging head and the charging dock are in normal charging, the first charging electrode 22 of the charging head needs to receive a positive power supply voltage, and the second charging electrode 23 needs to receive a negative power supply voltage, when the charging head and the charging dock are in the first state, that is, the charging electrode of the charging head and the power supply electrode of the charging dock are in positive connection, the control sub-circuit responds to the received first driving signal to respectively control the output terminal of the first electrode sub-circuit to output a positive power supply voltage, and the output terminal of the second electrode sub-circuit to output a negative power supply voltage, so that the charging head can be normally charged on the charging dock.
When the charging head is in the second state, that is, the charging electrode of the charging head is reversely connected with the power supply electrode of the charging seat, the control sub-circuit responds to the received second driving signal to respectively control the output end of the first electrode sub-circuit to output the negative voltage of the power supply and the output end of the second electrode sub-circuit to output the positive voltage of the power supply, so that the charging head can be normally charged on the charging seat.
In summary, the charging safety circuit provided in this embodiment can automatically adjust the power supply positive and negative voltages corresponding to the charging electrodes electrically connected to the power supply electrode output by the charging electrode of the charging base according to the condition that the charging electrode of the charging base and the power supply electrode of the charging base are in forward connection or reverse connection, so that the charging work between the charging base and the charging base is completed, the charging safety of the device is improved, and the device is prevented from being burnt.
In some optional implementations of this embodiment, the control sub-circuit includes:
a first end of the control unit 41 is configured to receive the first driving signal or the second driving signal, a second end of the control unit 41 is electrically connected to the output end of the first electrode sub-circuit, and a third end of the control unit 41 is electrically connected to the output end of the second electrode sub-circuit.
In particular, the control unit 41 may be a low power consumption processor, such as a microprocessor or a Programmable Logic Controller (PLC), capable of controlling the first electrode sub-circuit and the second electrode sub-circuit.
In some optional implementations of this embodiment, as shown in fig. 2, the first electrode sub-circuit includes:
a first commercially available chip (IR 1 IN fig. 2, a MOS transistor driver chip) with a model IR2104, a VCC pin of the first chip receives a power supply voltage, an IN pin of the first chip is electrically connected to a second terminal (L1 _ IN fig. 2) of the control unit 41, and an SD pin of the first chip receives a turn-off voltage; receiving a ground voltage by a COM pin of the first chip;
a first diode (D1 in fig. 2), an anode of the first diode receiving the power supply voltage, a cathode of the first diode being electrically connected to a VB pin of the first chip;
a first resistor (R1 in FIG. 2) having a first end electrically connected to the HO pin of the first chip;
a first capacitor (C1 in fig. 2), a first end of the first capacitor being electrically connected to the VB pin of the first chip, a second end of the first capacitor being electrically connected to the first end of the first resistor;
a first switching element (Q1 in fig. 2), a control terminal of the first switching element being electrically connected to the second terminal of the first resistor, a first terminal of the first switching element being electrically connected to the VS pin of the first chip, a second terminal of the first switching element being electrically connected to the output terminal (VCC in fig. 2) of the first electrode sub-circuit;
a second diode (D2 in fig. 2), an anode of the second diode being electrically connected to the first terminal of the first switching element, a cathode of the second diode being electrically connected to the output terminal of the first electrode sub-circuit;
a second resistor (R2 in FIG. 2) having a first end electrically connected to the LO pin of the first chip;
a second switching element (Q2 in fig. 2) having a control terminal electrically connected to the second terminal of the second resistor, a first terminal receiving a ground voltage, and a second terminal electrically connected to the first terminal of the first switching element;
a third diode (D3 in fig. 2), an anode of the third diode being electrically connected to the second terminal of the second switching element, and a cathode of the third diode being electrically connected to the anode of the second diode;
a second capacitor (C2 in fig. 2), a first end of the second capacitor being electrically connected to the SD pin of the first chip, and a second end of the second capacitor being electrically connected to the COM pin of the first chip.
Specifically, in the embodiment, in the example of fig. 2, the VCC pin of the first chip receives the power voltage of 12V, and the SD pin of the first chip receives the turn-off voltage of 12V.
In the example of fig. 2, the first switching element and the second switching element are MOS transistors, the first terminal of the first switching element is a source, the second terminal thereof is a drain, the control terminal thereof is a gate, the first terminal of the second switching element is a source, the second terminal thereof is a drain, and the control terminal thereof is a gate. However, it is obvious to those skilled in the art that the first switching element and the second switching element may be implemented as a triode, in which case, the first terminal of the first switching element is an emitter, the second terminal is a collector, the control terminal is a base, the first terminal of the second switching element is an emitter, the second terminal is a collector, and the control terminal is a base.
In some optional implementations of this embodiment, as shown in fig. 3, the second electrode sub-circuit includes:
a second chip (IR 2 IN fig. 3, a MOS transistor driver chip) of a commercially available model IR2104, a VCC pin of the second chip receives a power supply voltage, an IN pin of the second chip is electrically connected to a third terminal (L2 _ IN fig. 3) of the control unit 41, and an SD pin of the second chip receives a turn-off voltage; receiving a ground voltage by a COM pin of the first chip;
a fourth diode (D4 in fig. 3), an anode of the fourth diode receiving the power supply voltage, a cathode of the fourth diode being electrically connected to a VB pin of the second chip;
a third resistor (R3 in FIG. 3), a first end of the third resistor being electrically connected to the HO pin of the second chip;
a third capacitor (C3 in fig. 3), a first end of the third capacitor being electrically connected to the VB pin of the second chip, a second end of the third capacitor being electrically connected to a first end of the third resistor;
a third switching element (Q3 in fig. 3), a control terminal of the third switching element being electrically connected to the second terminal of the third resistor, a first terminal of the third switching element being electrically connected to the VS pin of the second chip, and a second terminal of the third switching element being electrically connected to an output terminal (VCC in fig. 3) of the second electrode sub-circuit;
a fifth diode (D5 in fig. 3), an anode of the fifth diode being electrically connected to the first terminal of the third switching element, a cathode of the fifth diode being electrically connected to the output terminal of the second electrode sub-circuit;
a fourth resistor (R4 in FIG. 3) having a first end electrically connected to the LO pin of the second chip;
a fourth switching element (Q4 in fig. 3) having a control terminal electrically connected to the second terminal of the fourth resistor, a first terminal receiving a ground voltage, and a second terminal electrically connected to the first terminal of the third switching element;
a sixth diode (D6 in fig. 3), an anode of the sixth diode being electrically connected to the second terminal of the fourth switching element, and a cathode of the sixth diode being electrically connected to the anode of the fourth diode.
A fourth capacitor (C4 in fig. 3), a first terminal of the fourth capacitor being electrically connected to the SD pin of the second chip, and a second terminal of the fourth capacitor being electrically connected to the COM pin of the second chip.
Specifically, in the embodiment, in the example of fig. 2, the VCC pin of the second chip receives the power voltage of 12V, and the SD pin of the second chip receives the turn-off voltage of 12V.
In the example of fig. 3, the third switching element and the fourth switching element are MOS transistors, the first terminal of the third switching element is a source, the second terminal thereof is a drain, the control terminal thereof is a gate, the first terminal of the fourth switching element is a source, the second terminal thereof is a drain, and the control terminal thereof is a gate. However, it is obvious to those skilled in the art that the third switching element and the fourth switching element may be implemented as a triode, in which case, the first terminal of the third switching element is an emitter, the second terminal is a collector, the control terminal is a base, the first terminal of the fourth switching element is an emitter, the second terminal is a collector, and the control terminal is a base.
The operation principle is described below with reference to fig. 2-3, and for example, in fig. 2-3, the first, second, third, and fourth switching elements all use N-type MOS transistors, and the power supply voltages received by the VCC pins of the first chip and the second chip are all 12V.
When the first switch element is IN a turned-on state after receiving the high level, the second switch element is IN a turned-off state after receiving the low level, so that the second end of the first switch element outputs the power supply voltage to the output end of the first electrode sub-circuit.
Accordingly, after receiving the low level, the IN pin of the second chip outputs the low level and the high level to the third switching element and the fourth switching element through the HO pin and the LO pin thereof, respectively, the third switching element is IN an off state after receiving the low level, the fourth switching element is IN an on state after receiving the high level, so that the second terminal of the fourth switching element outputs the ground voltage to the output terminal of the second electrode sub-circuit, that is, the first electrode sub-circuit outputs the power voltage (equivalent to the positive power voltage), the second electrode sub-circuit outputs the ground voltage (equivalent to the negative power voltage), the first charging electrode 22 of the charging head receives the positive power voltage, and the second charging electrode 23 receives the negative power voltage, thereby ensuring the normal charging between the charging stand and the charging head.
When the second terminal of the control unit 41 outputs a low level to the IN pin of the first chip, and the third terminal of the control unit 41 outputs a high level to the IN pin of the second chip, after the IN pin of the first chip receives the low level, the IN pin of the first chip outputs the low level and the high level to the first switch element and the second switch element through the HO pin and the LO pin thereof, respectively, the first switch element is IN a cut-off state after receiving the low level, and the second switch element is IN a conducting state after receiving the high level, so that the second terminal of the second switch element outputs a ground voltage to the output terminal of the second electrode sub-circuit.
Correspondingly, after receiving a high level, the IN pin of the second chip outputs a high level and a low level to the third switching element and the fourth switching element through the HO pin and the LO pin, respectively, the third switching element is IN a conducting state after receiving the high level, and the fourth switching element is IN a cut-off state after receiving the low level, so that the second end of the third switching element outputs a power voltage to the output end of the second electrode sub-circuit, that is, the first electrode sub-circuit outputs a ground voltage (equivalent to a power negative voltage), the second electrode sub-circuit outputs a power voltage (equivalent to a power positive voltage), the first charging electrode 22 of the charging head receives the power positive voltage, and the second charging electrode 23 receives the power negative electrode, thereby ensuring normal charging between the charging stand and the charging head.
It should be noted that, in this embodiment, the types of the first chip and the second chip are not limited to the IR2104, and the first chip and the second chip may be formed by any device capable of implementing the above functions, which is within the protection scope of the present application.
In some optional implementations of this embodiment, the electronic device further includes a power supply sub-circuit for supplying power to the first electrode sub-circuit and the second electrode sub-circuit.
Further, as shown in fig. 4, the power supply sub-circuit includes:
a power conversion chip of which the model can be lm7812, wherein a Vin pin of the power conversion chip receives a supply voltage (VCC in fig. 4), a GND pin of the power conversion chip receives a ground voltage, and a Vout pin of the power conversion chip outputs a supply voltage;
a fifth capacitor, a first terminal of the fifth capacitor receiving a supply voltage, a second terminal of the fifth capacitor receiving a ground voltage;
a sixth capacitor, a first terminal of which receives a ground voltage, and a second terminal of which is electrically connected to a Vout pin of the power conversion chip.
Specifically, in the example of fig. 4, the power supply voltage is 12V, and those skilled in the art should understand that the magnitude of the power supply voltage is not limited thereto, and this embodiment is not particularly limited thereto.
The lm7812 power conversion chip is selected as the power conversion chip, however, those skilled in the art should understand that the power conversion chip may be formed by any device having a power supply function, and all of these devices are within the protection scope of the present application.
Fig. 5 is a schematic structural diagram of a charging seat according to another embodiment of the present invention, as shown in fig. 5, the charging seat includes: a first housing 11, a first feeding electrode 12, a second feeding electrode 13 and the above-mentioned charging safety circuit.
Specifically, as shown in fig. 5, a corresponding circuit board 14 is disposed in the first housing 11, the charging safety circuit is disposed on the circuit board 14, the first housing 11 includes a charging slot 15 capable of accommodating a charging head, the first power supply electrode 12 and the second power supply electrode 13 are exposed on the surface of the charging slot 15, the first power supply electrode 12 corresponds to an output end of the first electrode sub-circuit, and the second power supply electrode 13 corresponds to an output end of the second electrode sub-circuit, that is, when the charging head is disposed in the charging slot 15, the charging electrode of the charging head is electrically connected to the power supply electrode of the charging base, and voltages output by the first electrode sub-circuit and the second electrode sub-circuit can be input into the charging head through the power supply electrode of the charging base to perform corresponding charging operations.
Fig. 6 shows a schematic structural diagram of a charging device according to still another embodiment of the present invention, as shown in fig. 6, the charging device includes:
the method comprises the following steps:
the charging seat provided in the above embodiment; and
and the charging head is matched with the charging seat.
Specifically, as shown in fig. 7, the charging head includes a second housing 21, a first charging electrode 22, and a second charging electrode 23, wherein in the example of fig. 7, the first charging electrode 22 and the second charging electrode 23 are respectively located at two sides of the bottom end of the second housing 21, and it should be understood by those skilled in the art that the locations of the first charging electrode 22 and the second charging electrode 23 are not limited thereto, and the present application is not limited thereto.
Further, in the example of fig. 8, the charging device further includes a motor 31, a winding roll 32 and an electrical connection line 33, wherein the electrical connection line 33 is wound on the winding roll 32, one end of the electrical connection line 33 is electrically connected to the display device, and the other end is electrically connected to the second housing 21, when the display device needs to be charged, the motor 31 drives the winding roll 32 to rotate, the electrical connection line 33 is lowered until the charging head is placed in the charging slot 15 of the charging stand during the rotation of the winding roll 32, so as to achieve the fixation between the charging head and the charging stand during the charging process, therefore, the second housing 21 is provided with a magnet 24, and the first housing 11 is correspondingly provided with an electromagnet 2418.
It should be noted that, in order to be able to determine whether the charging head is in the first state or the second state when being placed in the charging slot 15, the first housing 11 is further provided with a magnetic sensor 16, the magnetic sensor 16 sends a first driving signal or a second driving signal to the control sub-circuit in response to whether sensing the magnetic force of the magnet 24, the control sub-circuit controls the output terminal of the first electrode sub-circuit to output the positive power voltage and the output terminal of the second electrode sub-circuit to output the negative power voltage respectively in response to the received first driving signal, the control sub-circuit controls the output terminal of the first electrode sub-circuit to output the negative power voltage respectively in response to the received second driving signal, and the output terminal of the second electrode sub-circuit outputs the positive power voltage.
Specifically, the magnetic sensor 16 is capable of sensing magnetic force in a sensing range in real time, so as to generate a corresponding first driving signal, in the example of fig. 7, the magnet 24 is disposed on the surface of the second housing 21, in the example of fig. 5, the magnetic sensor 16 is disposed on the surface of the charging slot 15, when in a first state, that is, when the charging head is disposed in the charging slot 15 in a forward direction, the first charging electrode 22 and the second charging electrode 23 are electrically connected to the first power supply electrode 12 and the second power supply electrode 13, respectively, at which time, the magnetic sensor 16 is in a state of being opposite to the magnet 24, the distance between the magnet 24 and the magnetic sensor 16 is a first distance, and when in a second state, that is, when the charging head is disposed in the charging slot 15 in a reverse direction, the first charging electrode 22 and the second charging electrode 23 are electrically connected to the second power supply electrode 13 and the first power supply electrode 12, respectively, at this time, since the second housing 21 has a certain thickness with the magnetic sensor 16 facing away from the magnet 24, the second distance between the magnetic sensor 16 and the magnet 24 is different from the first distance (the second distance is greater than or less than the first distance).
Further, in the present embodiment, it can be determined whether the charging head is in the first state or the second state when placed in the charging slot 15 according to different distances between the magnetic sensor 16 and the magnet 24, and since the first distance is different from the second distance, for example, when the first distance is greater than the second distance, the sensing range of the magnetic sensor 16 can be set to be smaller than the first distance and greater than the second distance.
Thus, when the distance between the magnetic sensor 16 and the magnet 24 is the second distance, the magnetic sensor 16 can sense the corresponding magnetic force, so as to determine that the current state is in the second state, and send the corresponding second driving signal to the control sub-circuit, and when the distance between the magnetic sensor 16 and the magnet 24 is the first distance, because the first distance is greater than the sensing range of the magnetic sensor 16, the magnetic sensor 16 cannot sense the magnetic force, so as to determine that the current state is in the first state, and send the corresponding first driving signal to the control sub-circuit, similarly, when the first distance is less than the second distance, the sensing range of the magnetic sensor 16 can also be set within a range less than the second distance and greater than the first distance, and the corresponding result can be obtained by the above-mentioned determination method, which is not described herein again.
It should be noted that the magnetic sensor 16 of the present embodiment may be selected from SS49E, DRV5053VA, GH1815, or HAL815, and those skilled in the art should understand that the model of the magnetic sensor 16 is not limited to the above, and the present embodiment does not specifically limit this.
In addition, in order to guarantee safe in utilization, the voltage of the existing charging seat is a low voltage that changes from ac to dc, although the voltage is lower, if child plays, touch the power supply electrode of the charging seat with coin or other conductor, can cause the charging seat short circuit to cause certain hidden danger to child's safety, in order to avoid this problem, therefore, in some optional implementations of this embodiment, still include:
the controller is used for sending a charging signal to the control sub-circuit;
wherein the control sub-circuit receives the first drive signal or the second drive signal in response to the charging signal.
Specifically, the controller may be a low-power processor capable of controlling the control sub-circuit, for example: in this embodiment, when the display device needs to be charged, a user can send a corresponding charging signal to the control sub-circuit through the controller, and the control sub-circuit receives the first driving signal or the second driving signal in response to the charging signal and further controls the first electrode sub-circuit and the second electrode sub-circuit.
That is to say, when the control sub-circuit does not receive the charging signal, the first electrode sub-circuit and the second electrode sub-circuit do not output corresponding power voltage, and the charging seat is in a closed state, so as to avoid the situation that the charging seat is short-circuited due to the fact that the coin or other conductors contact the power supply electrode of the charging seat, and further improve the safety.
It should be noted that the controller may send the charging signal to the control sub-circuit by sending a radio frequency signal.
Fig. 9 shows a schematic structural diagram between the control unit 41 and the magnetic induction sensor in the present embodiment, wherein, as shown in fig. 9, the first terminal of the magnetic sensor 16 receives a ground voltage, the second terminal of the magnetic sensor 16 receives a power voltage (VCC in fig. 9), the third terminal of the magnetic sensor 16 is electrically connected to the second terminal of a fifth resistor, the first terminals of the fifth resistor receive the power voltage and are connected to the first terminals of a sixth resistor, the second terminals of the sixth resistor are connected to the second terminals of the fifth resistor and the first terminal of the control unit 41, a second terminal (L1 _ IN figure 9) of the control unit 41 is electrically connected to the input terminal of the first electrode sub-circuit, the third terminal (L2 _ IN figure 9) of the control unit 41 is electrically connected to the input of the second electrode sub-circuit, the fourth terminal (RF in fig. 9) of the control unit 41 is used for receiving the radio frequency signal of the controller.
Further, in this embodiment, the controller is further configured to send a charging stop signal to the control sub-circuit, and the control sub-circuit is configured to control the output terminal of the first electrode sub-circuit to output a ground voltage and the output terminal of the second electrode sub-circuit to output a ground voltage in response to the charging stop signal.
Specifically, after the charging of the display device is completed, the user may send a corresponding charging stop signal to the control sub-circuit through the controller, and the control sub-circuit controls the output terminal of the first electrode sub-circuit to output the ground voltage and the output terminal of the second electrode sub-circuit to output the ground voltage in response to the charging stop signal, so that the charging cradle stops the charging process for the charging head.
Next, the operation principle of stopping charging is described again with reference to fig. 2-3, for example, when the control unit 41 receives the charging stop signal, the second terminal and the third terminal of the control unit 41 both output low levels to the IN pins of the first chip and the second chip, respectively, so that the first and third switching elements are turned off, and the second and fourth switching elements are turned on, so that the first electrode sub-circuit and the second electrode sub-circuit output corresponding ground voltages, respectively.
In some optional implementations of this embodiment, the controller can be further configured to control the motor 31 of the charging device to rotate the winding roll 32, so that the charging head is moved downward, in order to determine whether the charging head is placed in the charging slot 15 of the charging stand, the charging stand may therefore further comprise a microswitch 17, for sensing the coupling between the charging head and the charging stand, in the example of fig. 5, two microswitches 17 are provided in the charging stand, and when the charging head is placed in the charging slot 15 of the charging stand, the charging head will cause corresponding pressure to the micro switch 17, the micro switch 17 is conducted under the pressure of the charging head and outputs a corresponding low level to the control unit 41, after the control unit 41 receives the low level of the micro switch 17, a stop-down signal is sent to the controller which controls the motor 31 to stop operating in response to the stop-down signal.
Further, in the example of fig. 5, the charging seat further includes an electromagnet 2418, when the micro switch 17 is turned on, the electromagnet 2418 can be activated, so that the charging seat and the charging head are tightly combined, and thus, when charging, the charging seat and the charging head can be ensured not to be separated or loosened from each other.
Another embodiment of the present invention provides a display device, as shown in fig. 10, including:
a display screen;
the power supply is used for supplying power to the display screen; and
the above embodiment provides a charging device, and the charging device is configured to charge the power supply.
In some optional implementations of this embodiment, the display screen is an electronic painted screen.
It should be noted that, in this embodiment, the display screen is not limited to the electronic drawing screen, and may also be a computer monitor or other devices with a display function, which is within the protection scope of this application.
Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it is obvious for those skilled in the art to make other variations or changes based on the above descriptions, and all the embodiments cannot be exhausted here, and all the obvious variations or changes that belong to the technical solutions of the present invention are still in the protection scope of the present invention.
Claims (12)
1. A charging safety circuit, comprising:
a control sub-circuit; and
the first electrode subcircuit and the second electrode subcircuit are respectively and electrically connected with the control subcircuit;
wherein,
in a first state, the control sub-circuit responds to a received first driving signal to respectively control the output end of the first electrode sub-circuit to output a power supply positive voltage and the output end of the second electrode sub-circuit to output a power supply negative voltage;
in a second state, the control sub-circuit responds to the received second driving signal to respectively control the output end of the first electrode sub-circuit to output the negative voltage of the power supply, and the output end of the second electrode sub-circuit to output the positive voltage of the power supply.
2. The charging safety circuit of claim 1, wherein the control subcircuit comprises:
and a first end of the control unit is used for receiving the first driving signal or the second driving signal, a second end of the control unit is electrically connected with the input end of the first electrode sub-circuit, and a third end of the control unit is electrically connected with the input end of the second electrode sub-circuit.
3. The charge safety circuit of claim 2, wherein the first electrode sub-circuit comprises:
the type is a first chip of IR2104, a VCC pin of the first chip receives a power supply voltage, an IN pin of the first chip is electrically connected with a second end of the control unit, and an SD pin of the first chip receives a turn-off voltage; receiving a ground voltage by a COM pin of the first chip;
a first diode, an anode of which receives the power supply voltage, and a cathode of which is electrically connected with a VB pin of the first chip;
a first resistor having a first end electrically connected to a HO pin of the first chip;
a first capacitor having a first terminal electrically connected to a VB pin of the first chip and a second terminal electrically connected to a first terminal of the first resistor;
a first switch element, a control terminal of which is electrically connected to the second terminal of the first resistor, a first terminal of which is electrically connected to the VS pin of the first chip, and a second terminal of which is electrically connected to the output terminal of the first electrode sub-circuit;
a second diode, an anode of which is electrically connected to the first terminal of the first switching element, and a cathode of which is electrically connected to the output terminal of the first electrode sub-circuit;
a second resistor having a first end electrically connected to the LO pin of the first chip;
a second switching element, a control terminal of the second switching element being electrically connected to a second terminal of the second resistor, a first terminal of the second switching element receiving a ground voltage, a second terminal of the second switching element being electrically connected to the first terminal of the first switching element;
a third diode having an anode electrically connected to the second terminal of the second switching element and a cathode electrically connected to the anode of the second diode;
and a first end of the second capacitor is electrically connected with the SD pin of the first chip, and a second end of the second capacitor is electrically connected with the COM pin of the first chip.
4. The charge safety circuit of claim 2, wherein the second electrode sub-circuit comprises:
a VCC pin of the second chip receives a power supply voltage, an IN pin of the second chip is electrically connected with a third end of the control unit, and an SD pin of the second chip receives a turn-off voltage; a COM pin of the second chip receives a ground voltage;
a fourth diode, an anode of which receives the power voltage, and a cathode of which is electrically connected to a VB pin of the second chip;
a third resistor, a first end of the third resistor being electrically connected with the HO pin of the second chip;
a third capacitor, a first end of the third capacitor being electrically connected to the VB pin of the second chip, a second end of the third capacitor being electrically connected to the first end of the third resistor;
a control terminal of the third switching element is electrically connected with a second terminal of the third resistor, a first terminal of the third switching element is electrically connected with the VS pin of the second chip, and a second terminal of the third switching element is electrically connected with an output terminal of the second electrode sub-circuit;
an anode of the fifth diode is electrically connected with the first end of the third switching element, and a cathode of the fifth diode is electrically connected with the output end of the second electrode sub-circuit;
a fourth resistor having a first end electrically connected to the LO pin of the second chip;
a fourth switching element, a control terminal of the fourth switching element being electrically connected to a second terminal of the fourth resistor, a first terminal of the fourth switching element receiving a ground voltage, a second terminal of the fourth switching element being electrically connected to a first terminal of the third switching element;
a sixth diode having an anode electrically connected to the second terminal of the fourth switching element and a cathode electrically connected to the anode of the fourth diode;
a first end of the fourth capacitor is electrically connected with the SD pin of the second chip, and a second end of the fourth capacitor is electrically connected with the COM pin of the second chip.
5. The charge safety circuit of claim 1, further comprising a power supply sub-circuit for powering the first electrode sub-circuit and the second electrode sub-circuit.
6. A charging stand, comprising:
a first housing;
the first power supply electrode and the second power supply electrode are arranged on the first shell; and
a charge safety circuit as claimed in any one of claims 1 to 5 disposed within the first housing;
wherein the first supply electrode corresponds to an output of the first electrode sub-circuit and the second supply electrode corresponds to an output of the second electrode sub-circuit.
7. A charging device, comprising:
the charging cradle of claim 6; and
and the charging head is matched with the charging seat.
8. The charging device of claim 7, wherein the charging head comprises:
a second housing;
the first charging electrode and the second charging electrode are arranged on the second shell; and
a magnet disposed on the second housing;
the first shell is provided with a magnetic sensor, the magnetic sensor responds to whether the magnetic force of the magnet is sensed to send a first driving signal or a second driving signal to the control sub-circuit, the control sub-circuit responds to the received first driving signal to respectively control the output end of the first electrode sub-circuit to output power supply positive voltage and the output end of the second electrode sub-circuit to output power supply negative voltage, the control sub-circuit responds to the received second driving signal to respectively control the output end of the first electrode sub-circuit to output power supply negative voltage, and the output end of the second electrode sub-circuit outputs power supply positive voltage.
9. The charging device according to claim 7, further comprising:
the controller is used for sending a charging signal to the control sub-circuit;
wherein the control sub-circuit receives the first drive signal or the second drive signal in response to the charging signal.
10. The charging device of claim 9, wherein the controller is further configured to send a stop-charging signal to the control sub-circuit, and the control sub-circuit is configured to control the output of the first electrode sub-circuit to output a ground voltage and the output of the second electrode sub-circuit to output a ground voltage in response to the stop-charging signal.
11. A display device, comprising:
a display screen;
the power supply is used for supplying power to the display screen; and
a charging arrangement according to any of claims 7 to 10 for charging the power supply.
12. The display device according to claim 11, wherein the display screen is an electronic painted screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020001812.9U CN211908390U (en) | 2020-01-02 | 2020-01-02 | Charging safety circuit, charging seat, charging device and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020001812.9U CN211908390U (en) | 2020-01-02 | 2020-01-02 | Charging safety circuit, charging seat, charging device and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211908390U true CN211908390U (en) | 2020-11-10 |
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ID=73298146
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020001812.9U Active CN211908390U (en) | 2020-01-02 | 2020-01-02 | Charging safety circuit, charging seat, charging device and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211908390U (en) |
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2020
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