CN215733592U - Charging display circuit and electric equipment with same - Google Patents

Abstract

The utility model discloses a charging display circuit and electric equipment with the same, wherein the charging display circuit comprises a main control module, a charging circuit, an indicating circuit, a power supply circuit and a self-locking circuit, wherein the power supply circuit and the self-locking circuit are respectively connected with the main control module; the self-locking circuit comprises a trigger output end used for outputting a self-locking signal, the indicating circuit comprises a first indicating branch and a second indicating branch, the second indicating branch is connected with a state terminal, and the first indicating branch is connected with the trigger output end and the state terminal. The charging display circuit provided by the utility model can realize the technical effect of displaying different display effects according to different states of charging and discharging, switching on and switching off and the like of the circuit on the premise of not additionally occupying the output pin of the main control module.

Description

Charging display circuit and electric equipment with same

Technical Field

The utility model relates to the technical field of power supply and distribution, in particular to a charging display circuit and electric equipment with the same.

Background

The display circuit that charges that carries on in the present consumer, often through carrying out special programming to MCU (Microcontroller Unit, little the control Unit), and to the charged state, full charge state, different pins are configured respectively to power-on state and test state etc. thereby control different demonstration circumstances that instruct the branch road to show difference respectively, but this kind of configuration can bring the occupation of pin resource for MCU, if set up the demonstration that MCU was used for controlling state such as charging alone, then can greatly increase the complexity of cost and circuit, how to reduce the display circuit that charges and occupy MCU pin quantity, simplify circuit structure and save the cost, become the technical problem who waits to solve urgently.

SUMMERY OF THE UTILITY MODEL

One objective of the present invention is to provide a charging display circuit, so as to solve the technical problems of the charging display circuit in the prior art, such as excessive occupation of MCU pins, complex circuit structure, and high cost.

One object of the present invention is to provide an electric device having a charging display circuit.

In order to achieve one of the above objectives of the present invention, an embodiment of the present invention provides a charging display circuit, which is applied to an electric device that can be charged through an adapter, and includes a main control module, a charging circuit, an indication circuit, and a power supply circuit and a self-locking circuit that are respectively connected to the main control module, wherein the self-locking circuit is configured to form a self-locking signal and output a self-locking signal after receiving an external trigger signal, and control the power supply circuit to supply power to the main control module, and the charging circuit includes a status terminal for outputting a status signal and is configured to output the status signal to the indication circuit in a charging state; the self-locking circuit comprises a trigger output end used for outputting the self-locking signal, the indicating circuit comprises a first indicating branch and a second indicating branch, the second indicating branch is connected with the state terminal, and the first indicating branch is connected with the trigger output end and the state terminal.

As a further improvement of an embodiment of the present invention, the first indication branch and the second indication branch respectively include a first indication lamp and a second indication lamp; the indicating circuit is configured to drive and light the first indicating lamp to represent a starting state when only the self-locking signal is received, drive and light the second indicating lamp to represent a charging state when only the state signal is received, drive and light the first indicating lamp to represent a full-charge state when the state signal is not received and the self-locking signal is not received, and drive and light the second indicating lamp to represent a testing state when the self-locking signal and the state signal are received simultaneously.

As a further improvement of the embodiment of the present invention, the indicating circuit further includes a first field effect transistor for controlling the first indicator light to turn on and off, the first field effect transistor is configured such that a source is grounded, a drain is connected to a negative electrode of the first indicator light, a gate is connected to the status terminal and the trigger output terminal, and an anode of the first indicator light is connected to the trigger output terminal.

As a further improvement of the embodiment of the present invention, the charging display circuit further includes an external power supply terminal connected to the adapter, the second indication branch includes a second field effect transistor for controlling the second indication lamp to turn on and off, the second field effect transistor is configured such that a source thereof is connected to the positive electrode of the second indication lamp, a gate thereof is connected to the status terminal, and a drain thereof is connected to the external power supply terminal.

As a further improvement of an embodiment of the present invention, the charging circuit further includes a charging input terminal and a charging output terminal, and the power supply circuit includes an internal power supply; the external power supply terminal is respectively connected with the anode of the first indicator light, the grid of the first field effect transistor and the charging input terminal, the charging output terminal is connected with the internal power supply, and the charging circuit is configured to control the state terminal to selectively output a state signal according to the state of the charging input terminal.

As a further improvement of an embodiment of the present invention, the charging display circuit further includes a switch module, the power supply circuit further includes a conversion module connected to the main control module, and the self-locking circuit is respectively connected to the switch module and the conversion module, and is configured to receive an external trigger signal input by the switch module and selectively enable the conversion module to supply power to the main control module.

As a further improvement of an embodiment of the present invention, the self-locking circuit includes a first diode and a third field effect transistor, and the conversion module includes a conversion output end and a conversion enable end, which are connected to the main control module; the switch module is configured to be a non-self-locking contact, one end of the switch module is grounded, the other end of the switch module is connected with the cathode of the first diode, the third field effect transistor is configured to be that the drain electrode of the third field effect transistor is connected with the internal power supply, the grid electrode of the third field effect transistor is connected with the internal power supply and the anode of the first diode, the source electrode of the third field effect transistor is connected with a trigger output end, and the trigger output end is connected with the conversion enabling end.

As a further improvement of an embodiment of the present invention, the main control module includes a signal input terminal and a signal output terminal, the self-locking circuit further includes a second diode, a first triode and a second triode, a negative electrode of the second diode is connected to a negative electrode of the first diode, the first triode is configured such that an emitter is grounded, a base is connected to the conversion output terminal and a positive electrode of the first diode, and a collector is connected to the conversion output terminal and the signal input terminal, the second triode is configured such that an emitter is grounded, a base is connected to the signal output terminal, and a collector is connected to a gate of the third field effect transistor; the main control module is configured to selectively output an internal trigger signal through the signal output terminal according to the signal input of the signal input terminal.

As a further improvement of an embodiment of the present invention, the self-locking circuit further includes a fourth field effect transistor, the fourth field effect transistor is configured such that a drain is connected to the internal power supply, a source is connected to a drain of the third field effect transistor and a gate of the third field effect transistor, and the gate is connected to the external power supply terminal and a ground level; the charging display circuit further comprises a third triode, the main control module further comprises a test output end, an emitting electrode of the third triode is grounded, a base electrode of the third triode is connected with the test output end, a collector electrode of the third triode is connected with a grid electrode of the third field effect transistor, and the main control module is configured to selectively output a test signal through the test output end according to a signal of the signal input end and control the charging display circuit to enter the test state; the internal trigger signal and the test signal are at high level, and the state signal is at low level.

In order to achieve one of the above objectives of the present invention, an embodiment of the present invention provides an electric device, including the charging display circuit according to any one of the above technical solutions.

Compared with the prior art, the charging display circuit provided by the utility model has the advantages that the self-locking circuit is arranged to execute power supply self-locking of the main control module, the trigger output end for outputting the self-locking signal is configured, the trigger output end is introduced into the indicating circuit, the state output of the charging circuit and the access of the adapter are further matched, and the switching control of the display effect is executed, so that the technical effect of displaying different display effects according to different states of charging, discharging, on-off and the like of the circuit is realized on the premise of not additionally occupying an output pin of the main control module.

Drawings

FIG. 1 is a schematic diagram of a charging display circuit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a power supply circuit and a connection portion thereof of a charging display circuit according to another embodiment of the present invention;

FIG. 3 is a circuit diagram of an indicating circuit portion of the charge display circuit according to an embodiment of the present invention;

fig. 4 is a circuit configuration diagram of a portion of the charge display circuit other than the indication circuit portion according to the embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.

It is to be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Lithium battery technology and standard interface's development and unity for but current small-size consumer adopts rechargeable lithium cell as internal power supply more, in order to save the inconvenience that traditional removable dry battery brought, the inside charging circuit of lithium cell cycle charge's process often inserts the consumer through the adapter realizes, charging circuit contains in setting up the inside display circuit that charges of consumer, the display circuit that charges still includes the indicating circuit who is used for instructing consumer start, shutdown, charged state at least. However, since the small-sized electric devices have a high integration degree, the number of pins of an MCU (micro controller Unit), also called a Single-Chip Microcomputer or a Single Chip Microcomputer, used as a main control module is limited, and if different equivalent pins generated by a control indicating circuit are respectively connected to the main control module, the complexity of the circuit is increased, and the functions of the electric devices are limited.

The present invention has been made to solve the above-mentioned problems, and an electric device including a charge display circuit having a special structural arrangement and functional configuration is provided. The utility model is not limited to other functional configurations of the electric equipment, and the components and parts correspondingly arranged on the electric equipment are not limited under the condition of having other expanded functions, for example, in one embodiment, the electric equipment can be defined as medical equipment and is configured to achieve the effect of treatment or auxiliary treatment by generating low-frequency electrical stimulation. The electric device may be configured to include a power-on state, a power-off state, a charging state, a full power state and a testing state, and more particularly, may be configured to automatically power off after entering the charging state, and allow the charging state and the power-on state to exist simultaneously after entering the testing state.

The test state can be specifically defined as an aging test state, wherein the aging test refers to a process of carrying out corresponding condition strengthening experiments on the aging condition of a product by simulating various factors related to the product in actual use conditions, so that the quality inspection requirement is met, and the working reliability of the product is verified; of course the test state may have other definitions.

For a charging display circuit arranged in the electric equipment, the utility model provides an implementation mode as shown in fig. 1, the charging display circuit can receive the access of an external adapter 10 and charge for itself, and the charging display circuit specifically comprises a main control module 1, a charging circuit 2, an indicating circuit 3, and a power supply circuit 4 and a self-locking circuit 5 which are respectively connected with the main control module 1. The indicating circuit 3 is respectively connected to the charging circuit 2 and the self-locking circuit 5, and is configured to selectively drive at least two indicating branches inside the charging circuit 2 and the self-locking circuit 5 to act according to signals output by the charging circuit 2 and the self-locking circuit 5, where the indicating branches are used to generate an indicating signal in this embodiment, which may be an optical signal and/or an acoustic signal, so as to represent the current states of the charging display circuit and the electric device.

Specifically, in this embodiment, the self-locking circuit 5 is respectively connected to the power supply circuit 4 and the main control module 1, and is configured to form a self-locking signal and output the self-locking signal after receiving an external trigger signal, and control the power supply circuit 4 to supply power to the main control module 1, the charging circuit 2 is configured to output a state signal to the indicating circuit 3 in a charging state, the indicating circuit 3 includes a first indicating branch 31 and a second indicating branch 32, wherein the second indicating branch 32 is configured to be connected to the charging circuit 2 and receive the state signal, and the first indicating branch 31 is configured to be respectively connected to the charging circuit 2 and the self-locking circuit 5 and respectively receive the state signal and the self-locking signal.

Therefore, the first indicating branch 31 receives the self-locking signal and is driven after the self-locking circuit 5 forms self-locking; the second indicating branch 32 receives the status signal and is driven when the charging display circuit is in a charging state. In the charging state, the first indicating branch 31 also receives the state signal, and is forcibly turned off by the state signal, so that the second indicating branch 32 is driven independently; when the power is full, the state signal is no longer output, the second indicating branch 32 is powered off, the limitation of the state signal on the first indicating branch 31 is eliminated, and the first indicating branch 31 receives the input of the self-locking signal and is driven; in the test state, the state signal and the self-locking signal are output simultaneously, the triggering of the self-locking signal to the first indicating branch 31 is forcibly closed by the state signal, and the state signal further provides the triggering of the second indicating branch 32, so that the second indicating branch 32 is driven independently.

Thus, the determination circuit is currently in a power-on state and forms self-locking by "not charging and the first indicating branch 31 is driven", the determination circuit is currently in a charging state by "charging and the second indicating branch 32 is driven", the determination circuit is currently in a full-power state by "charging and the first indicating branch 31 is driven", and the determination circuit is currently in a test state by "starting and the second indicating branch 32 is driven". The technical effect that a plurality of states can correspond to different display conditions without occupying any pin on the main control module 1 is achieved.

Further, the charging display circuit further includes an external power supply terminal 6. The external power supply terminal 6 is configured to connect the adapter 10 and the charging circuit 2, respectively, to transmit the power of the adapter 10 to the charging circuit 2, to connect the first indicating branch 31 and the second indicating branch 32, respectively, to supply power thereto, and to connect the self-locking circuit 5 to input a signal indicating that the adapter 10 has been switched into the circuit.

In another embodiment of the present invention, as shown in fig. 2, the external power terminal 6 may also be disposed in the power supply circuit 4, and the external power terminal 6 disposed in the power supply circuit 4 is connected to the external charging circuit 2 and transmits the electric energy to the internal power source 41 in the power supply circuit 4 via the charging circuit 2. In one embodiment, the charging Circuit 2 may be configured as a charging IC Chip (IC). The configuration of such structural relationships or module/circuit selection configurations are generally applicable to any structure of the present invention, and the resulting new embodiments are within the scope of the present invention.

Specifically, the power supply circuit 4 further includes an internal power supply 41 and a conversion module 42 in the present invention. The internal power supply 41 is configured as a power supply for supplying power to the electric equipment and a charging display circuit arranged in the electric equipment under the condition that the external adapter 10 is not connected; the conversion module 42 is configured to connect to the main control module 1 and transmit the power received from the internal power source 41 to the main control module 1. Further, the charging display circuit further comprises a switch module 7, the internal power supply 41, the conversion module 42 and the switch module 7 are respectively connected with the self-locking circuit 5, and the self-locking circuit 5 is configured to receive an external trigger signal input by the switch module 7 and selectively enable the conversion module 42 to supply power to the main control module 1.

Of course, in other embodiments, the conversion module 42 may be configured to connect to the main control module 1 at one end and connect to other components capable of providing power at the other end. Meanwhile, in this embodiment, the self-locking circuit 5 also has a connection relationship with the main control module 1 and the external power terminal 6, respectively, and the functions performed are the same as those of the embodiment shown in fig. 1, and are not described again here.

As for the specific circuit configuration for realizing the above-described functions, a specific circuit configuration is provided in the present embodiment as shown in fig. 3 and 4.

The charging circuit 2 comprises a status terminal 21 for outputting the status signal, the self-locking circuit 5 comprises a trigger output 50 for outputting the self-locking signal, further, the first indicating branch 31 is connected to the trigger output 50 and the status terminal 21, respectively, and the second indicating branch 32 is connected to the status terminal 21. Thus, the corresponding technical effects described above are achieved.

Specifically, the first indication branch 31 and the second indication branch 32 respectively include a first indication lamp 311 and a second indication lamp 321, the first indication lamp 311 and the second indication lamp 321 may be configured as an LED lamp (Light Emitting Diode), a pixel unit or other Light Emitting units, and any other components that can generate a display after being turned on may be alternatively implemented in this embodiment.

As such, the indication circuit 3 may be further configured to:

when only the self-locking signal is received, the first indicator lamp 311 is driven to be lightened to represent the power-on state,

upon receiving only the status signal, the second indicator lamp 321 is driven to be lit to represent the charging status,

when the status signal is not received and the self-locking signal is not received, the first indicator lamp 311 is driven to be lighted to represent the full power state,

when the self-locking signal and the status signal are received at the same time, the second indicator light 321 is driven to be lighted to represent the test status.

In the above embodiment in which the two indicating branches are respectively configured with the indicating lamps, the indicating circuit 3 further includes a first field effect transistor 312 for controlling the first indicating lamp 311 to turn on and off, the first field effect transistor 312 is specifically configured such that the source of the first field effect transistor 312 is grounded, the drain of the first field effect transistor 312 is connected to the cathode of the first indicating lamp 311, the gate of the first field effect transistor 312 is respectively connected to the status terminal 21 and the trigger output terminal 50, and the anode of the first indicating lamp 311 is also connected to the trigger output terminal 50.

Preferably, the first fet 312 is configured as an N-channel enhancement fet, the latching signal is configured as a high-level signal, and the status signal is configured as a low-level signal. Of course, the trigger output terminal 50 may be configured to output a low level or a 0 level when the setting condition is not satisfied, and the status terminal 21 may be configured to output a high level or a 0 level when the setting condition is not satisfied. The specific configuration does not affect the realization of the expected technical effect of the utility model, and an operator can configure the first field effect transistor as an N-channel depletion type field effect transistor or a P-channel field effect transistor according to the requirement and correspondingly adjust the configuration of the high level and the low level of the signal.

Therefore, in the charging state, the trigger output terminal 50 outputs a high-level self-locking signal, the state terminal 21 outputs a high-level or 0-level signal, the positive electrode of the first indicator lamp 311 is energized, the gate potential of the first fet 312 is pulled high by the high-level self-locking signal to be turned on, and the first indicator lamp 311 is driven to light.

In the embodiment where the charging display circuit includes the external power supply terminal 6, the second indicating branch 32 further includes a second fet 322 for controlling the second indicating lamp 321 to turn on and off. Specifically, the second field effect transistor 322 is configured such that the source of the second field effect transistor 322 is connected to the positive electrode of the second indicator lamp 321, the gate of the second field effect transistor 322 is connected to the status terminal 21, and the drain of the second field effect transistor 322 is connected to the external power supply terminal 6.

Preferably, the second fet 322 is configured as a P-channel enhancement mode fet. In this way, in the charging state, the status terminal 21 outputs a low level status signal to be applied to the gate of the second fet 322, the second fet 322 is turned on, the power of the adapter 10 is connected to the second indicator lamp 321 through the external power supply terminal 6, the second indicator lamp 321 is driven to light, the low level status signal is simultaneously applied to the gate of the first fet 312, the first fet 312 configured as an N-channel enhancement mode is turned off, and the first indicator lamp 311 is not lit; in a full power state (or on state), the state terminal 21 outputs a high level signal to be applied to the gate of the second fet 322, the second fet 322 is turned off, the second indicator lamp 321 is not turned on, the high level signal is also applied to the gate of the first fet 312, the first fet 312 is turned on, and the first indicator lamp 311 is driven to be turned on.

In the embodiment where the power supply circuit 4 includes the internal power source 41, the charging circuit 2 further includes a charging input terminal 22 and a charging output terminal 23, in this case, the external power source terminal 6 is respectively connected to the anode of the first indicator lamp 311, the gate of the first fet 312, and the charging input terminal 22, the charging output terminal 23 is connected to the internal power source 41, and the charging circuit 2 is configured to control the status terminal 21 to selectively output the status signal according to the status of the charging input terminal 22. When the charging input terminal 22 receives power supply from the external power supply terminal 6, on the one hand, power is transmitted to the internal power supply 41 through the charging output terminal 23 for charging, and on the other hand, the status terminal 21 is controlled to output a status signal of a low level, and when power supply from the external power supply terminal 6 is not received, the status terminal 21 outputs a high level or a 0 level.

In combination with the above configuration of the components and the connection relationship, the present embodiment also has a special working state, that is, the test state described above, where the electrical device is powered on and connected to the adapter 10. In this state, the status terminal 21 outputs a low status signal to be applied to the gate of the first fet 312 and the gate of the second fet 322, respectively, and the first fet 312 is turned off and the second fet 322 is turned on, and at this time, the external power supply terminal 6 is connected to the adapter 10, so that the first indicator lamp 311 is not turned on and the second indicator lamp 321 is driven to turn on.

For the triggering of the test state, in the present embodiment, the switch module 7 may be configured to implement the triggering, and specifically, an operator may input a specific signal to the self-locking circuit 5 through the switch module 7 to trigger the charging display circuit to enter the test state. Further, in the embodiment that the charging display circuit is further provided with the conversion module 42, the self-locking circuit 5 is configured to be connected to the switch module 7 and the conversion module 42, respectively, and receive the external trigger signal input by the switch module 7, and selectively enable the conversion module 42 to supply power to the main control module 1, and further has the following specific configuration as shown in fig. 4:

the self-locking circuit 5 comprises a first diode 51 and a third fet 53, and the switching module 42 comprises a switching output terminal 420 connected to the main control module 1 and a switching enable terminal 422. Further, the switch module 7 is configured as a non-self-locking contact, one end of the switch module 7 is grounded, and the other end of the switch module 7 is connected to the cathode of the first diode 51; the third fet 53 is configured such that the drain of the third fet 53 is connected to the internal power source 41, the gate of the third fet 53 is connected to the internal power source 41 and the anode of the first diode 51, the source of the third fet 53 is connected to the trigger output terminal 50, and the trigger output terminal 50 is connected to the switching enable terminal 422.

Certainly, the above content is not the only technical solution of the present invention, on one hand, the conversion module 42 further includes a conversion input end in an implementation manner, the conversion input end is connected to the internal power supply 41 to receive the electric energy of the internal power supply 41, and outputs the electric energy to the main control module 1 through the conversion output end 420 after being adjusted to a proper voltage, and meanwhile, the input end of the conversion module 42 may also be connected to other components capable of providing the electric energy, which is not exhaustive herein; on the other hand, since the third fet 53 can directly transmit the power of the internal power source 41 to the switching enable terminal 422 when it is turned on, the switching enable terminal 422 can be used as the switching input terminal in one embodiment.

Preferably, the first diode 51 is configured as a normal unidirectional conducting diode, the third fet 53 is configured as a P-channel enhancement fet, and the switch module 7 is configured as a normally-open contact. Thus, the switch module 7 is turned on, the voltage level of the cathode of the first diode 51 is pulled low, the first diode 51 is turned on, the gate of the third fet 53 is grounded, and the trigger output 50 is connected to the internal power source 41 to output a high voltage level. Since the trigger output terminal 50 is connected to the conversion enable terminal 422 of the conversion module 42, the conversion output terminal 420 of the conversion module 42 correspondingly outputs electric energy and supplies power to the main control module 1.

It should be emphasized that "connected" includes not only the direct connection between two components, but also the indirect connection between two components through other components, which should be known to those skilled in the art and will not be described in detail below. Meanwhile, the technical schemes formed by direct connection and/or indirect connection can be summarized in the utility model.

In the embodiment, the external trigger signal is configured to determine the operating state of the main control module 1 or the charging display circuit, in the embodiment, the switching between the states is determined by the conduction duration of the switch module 7, in the embodiment where the switch module 7 is configured as a non-self-locking contact, the switch module 7 is conducted to enter the power-on state for a preset duration in the power-off state, the switch module 7 is conducted to enter the test state in the power-on state at a specific timing sequence, where the specific timing sequence is similar to the concept of the specific signal in the foregoing, and may be configured to be triggered intermittently, and the switch module 7 is conducted to enter the power-off state for the preset duration in the power-on state.

Further, the main control module 1 includes a signal input terminal 11 and a signal output terminal 12, and the self-locking circuit 5 further includes a second diode 52, a first triode 55 and a second triode 56. Wherein, the cathode of the second diode 52 is connected with the cathode of the first diode 51; first transistor 55 is configured such that the emitter of first transistor 55 is grounded, the base of first transistor 55 is connected to switching output 420 and the anode of first diode 51, and the collector of first transistor 55 is connected to switching output 420 and signal input 11; the second triode 56 is configured such that the emitter of the second triode 56 is grounded, the base of the second triode 56 is connected with the signal output terminal 12, and the collector of the second triode 56 is connected with the gate of the third field effect transistor 53; the main control module 1 is further configured to selectively output the internal trigger signal through the signal output terminal 12 according to the signal input of the signal input terminal 11.

Preferably, the second diode 52 is configured as a normal unidirectional diode, the first transistor 55 and the second transistor 56 are configured as NPN transistors, and the internal trigger signal is a high level signal. Thus, the switch module 7 is turned on, the negative level of the second diode 52 is pulled low, the base of the second triode 56 is grounded and cut off, the switching output end 420 inputs a high level to the signal input end 11, the main control module 1 controls the signal output end 12 to output an internal trigger signal to the base of the first triode 55 according to the high level input of the signal input end 11, the first triode 55 is turned on, the gate of the third field effect transistor 53 is grounded, the third field effect transistor 53 is turned on, and a self-locking signal is output through the trigger output end 50; after the switch module 7 is turned off, the signal output end 12 outputs a high-level internal trigger signal unchanged, the conversion module 42 is enabled continuously and supplies power to the main control module 1 and the signal input end 11, and the self-locking signal drives the first indication branch 31 to act, so that the first indicator lamp 311 is turned on to represent a power-on state.

In the power-on state, the level of the signal input terminal 11 is continuously set high, and the signal input terminal 11 is grounded when the switch module 7 is closed once, so that the main control module 1 can receive signals input by the switch module 7 and the self-locking circuit 5 through detecting the high and low levels of the signal input terminal 11 to adjust the signals output by the signal output terminal 12.

In addition, the self-locking circuit 5 further includes a fourth field effect transistor 54, and is specifically configured such that a drain of the fourth field effect transistor 54 is connected to the internal power supply, a source of the fourth field effect transistor 54 is connected to a drain of the third field effect transistor 53 and a gate of the third field effect transistor 53, and the gate of the fourth field effect transistor 54 is connected to the external power supply terminal 6 and the ground level, respectively.

Preferably, the fourth fet 54 is configured as a P-channel enhancement fet. In this way, in the process of entering the charging state from the power-on state, when the external power terminal 6 is not connected to the adapter 10, the gate of the fourth fet 54 is grounded and conducted, and the internal power supply 41 is connected to the self-locking circuit 5 to supply power to the trigger output terminal 50, thereby assisting in driving the first indication branch 31; when the external power supply terminal 6 is connected to the adapter 10, the gate of the fourth field effect transistor 54 is turned on, and the internal power supply 41 is powered off, so that the power supply of the main control module 1 and the first indication branch 31 is cut off, and the effect of controlling the power-driven equipment to be shut down after charging is achieved.

Further, the charging display circuit further comprises a third triode 13, and the main control module 1 further comprises a test output end 14; the third triode 13 is specifically configured such that the emitter of the third triode 13 is grounded, the base of the third triode 13 is connected to the test output terminal 14, and the collector of the third triode 13 is connected to the gate of the third field-effect transistor 53; the main control module 1 is configured to selectively output a test signal through the test output terminal 14 according to a signal of the signal input terminal 11, and control the charging display circuit to enter a test state.

Preferably, the third transistor 13 is configured as an NPN transistor, and the test signal is configured as a high level signal. Thus, in the process of entering the test state from the power-on state, after the signal input terminal 11 receives the specific signal input from the switch module 7 and the self-locking circuit 5, the main control module 1 enters the test state, and the locking test output terminal 14 outputs the high-level test signal, at this time, even if the external power supply terminal 6 is connected to the adapter 10 inputting the high level, the gate of the fourth field-effect transistor 54 is always grounded and conducted through the third triode 13, and the main control module 1 can still work normally. Thus, the aging test state of charging and working is entered. It is understood that the above-described circuit is within the scope of the present invention, and embodiments in which circuit details are changed to achieve the desired technical effects are also within the scope of the present invention.

Other configurations of components exist in the circuit structure, which are not specifically described, but can be unambiguously derived from fig. 3 and 4, such as diodes for limiting the unidirectional current conduction, which are respectively connected in series between the anode of the first indicator lamp 311 and the external power supply terminal 6 and the trigger output terminal 50, and resistors connected between the components or between connection points, which are used as current limiting and protecting circuits, and can be adjusted by those skilled in the art according to actual conditions, and the description is not repeated here.

In summary, the charging display circuit provided by the present invention configures the trigger output terminal 50 for outputting the self-locking signal while the self-locking circuit 5 is configured to perform power supply self-locking of the main control module 1, and introduces the trigger output terminal 50 into the indication circuit 3, and further performs switching control of the display effect in cooperation with state output of the charging circuit 2 and access of the adapter 10, so that the technical effect of displaying different display effects according to different states of charging and discharging of the circuit, switching on and off, and the like is achieved on the premise of not additionally occupying an output pin of the main control module 1.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (10)

1. A charging display circuit is applied to electric equipment which can be charged through an adapter (10), and is characterized by comprising a main control module (1), a charging circuit (2), an indicating circuit (3), a power supply circuit (4) and a self-locking circuit (5) which are respectively connected with the main control module (1), wherein the self-locking circuit (5) is configured to form a self-locking signal and output the self-locking signal after receiving an external trigger signal and control the power supply circuit (4) to supply power to the main control module (1), the charging circuit (2) comprises a state terminal (21) used for outputting a state signal and is configured to output the state signal to the indicating circuit (3) in a charging state; the self-locking circuit (5) comprises a trigger output end (50) used for outputting the self-locking signal, the indicating circuit (3) comprises a first indicating branch (31) and a second indicating branch (32), the second indicating branch (32) is connected with the state terminal (21), and the first indicating branch (31) is connected with the trigger output end (50) and the state terminal (21).

2. The charging display circuit according to claim 1, wherein the first indication branch (31) and the second indication branch (32) comprise a first indication lamp (311) and a second indication lamp (321), respectively; the indicating circuit (3) is configured to drive the first indicator light (311) to be lighted to represent a power-on state when only the self-locking signal is received,

upon receiving only the status signal, drive-illuminating the second indicator light (321) to characterize a charging status,

when the state signal is not received and the self-locking signal is not received, the first indicator lamp (311) is driven to be lightened to represent a full power state,

and when the self-locking signal and the state signal are received simultaneously, the second indicator lamp (321) is driven to be lightened to represent a test state.

3. The charging display circuit according to claim 2, wherein the indicator circuit (3) further comprises a first field effect transistor (312) for controlling the first indicator light (311) to turn on and off, the first field effect transistor (312) is configured with a source grounded, a drain connected to a cathode of the first indicator light (311), and a gate connected to the status terminal (21) and the trigger output terminal (50), and an anode of the first indicator light (311) is connected to the trigger output terminal (50).

4. A charging display circuit according to claim 3, further comprising an external power supply terminal (6) connected to the adapter (10), wherein the second indicating branch (32) comprises a second field effect transistor (322) for controlling the second indicating lamp (321) to turn on and off, the second field effect transistor (322) being configured to have a source connected to the positive terminal of the second indicating lamp (321), a gate connected to the status terminal (21), and a drain connected to the external power supply terminal (6).

5. A charging display circuit as claimed in claim 4, characterized in that the charging circuit (2) further comprises a charging input (22) and a charging output (23), the supply circuit (4) comprising an internal power supply (41); the external power supply terminal (6) is respectively connected with the anode of the first indicator lamp (311), the grid of the first field effect transistor (312) and the charging input end (22), the charging output end (23) is connected with the internal power supply (41), and the charging circuit (2) is configured to control the state terminal (21) to selectively output a state signal according to the state of the charging input end (22).

6. The charging display circuit according to claim 5, further comprising a switch module (7), wherein the power supply circuit (4) further comprises a conversion module (42) connected to the main control module (1), and wherein the self-locking circuit (5) is respectively connected to the switch module (7) and the conversion module (42) and configured to receive an external trigger signal input by the switch module (7) and selectively enable the conversion module (42) to supply power to the main control module (1).

7. The charging display circuit according to claim 6, wherein the self-locking circuit (5) comprises a first diode (51) and a third field effect transistor (53), and the conversion module (42) comprises a conversion output terminal (420) connected to the main control module (1) and a conversion enable terminal (422); the switch module (7) is configured to be a non-self-locking contact, one end of the switch module is grounded, the other end of the switch module is connected with the cathode of the first diode (51), the third field effect transistor (53) is configured to be connected with the drain electrode of the internal power supply (41), the grid electrode of the third field effect transistor is connected with the anodes of the internal power supply (41) and the first diode (51), the source electrode of the third field effect transistor is connected with the trigger output end (50), and the trigger output end (50) is connected with the conversion enabling end (422).

8. The charging display circuit according to claim 7, wherein the main control module (1) comprises a signal input terminal (11) and a signal output terminal (12), the self-locking circuit (5) further comprises a second diode (52), a first triode (55) and a second triode (56), wherein a cathode of the second diode (52) is connected to a cathode of the first diode (51), the first triode (55) is configured with an emitter grounded, a base connected to the converting output terminal (420) and an anode of the first diode (51), and a collector connected to the converting output terminal (420) and the signal input terminal (11), the second triode (56) is configured with an emitter grounded, a base connected to the signal output terminal (12), and a collector connected to a gate of the third field effect transistor (53); the main control module (1) is configured to selectively output an internal trigger signal through the signal output end (12) according to the signal input of the signal input end (11).

9. The charging display circuit according to claim 8, wherein the self-locking circuit (5) further comprises a fourth field effect transistor (54), the fourth field effect transistor (54) is configured to have a drain connected to the internal power supply (41), a source connected to the drain of the third field effect transistor (53) and the gate of the third field effect transistor (53), and a gate connected to the external power supply terminal (6) and a ground level;

the charging display circuit further comprises a third triode (13), the main control module (1) further comprises a test output end (14), an emitter electrode of the third triode (13) is grounded, a base electrode of the third triode is connected with the test output end (14), a collector electrode of the third triode is connected with a grid electrode of the third field effect transistor (53), and the main control module (1) is configured to selectively output a test signal through the test output end (14) according to a signal of the signal input end (11) to control the charging display circuit to enter the test state;

the internal trigger signal and the test signal are at high level, and the state signal is at low level.

10. An electric device comprising the charging display circuit according to any one of claims 1 to 9.

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