Power input circuit and display screen

Abstract

The utility model discloses a power supply input circuit and a display screen, the power supply input circuit comprises a controller and at least two sub-circuits, each sub-circuit comprises an electric signal detection module and a relay control module; the electric signal detection module is used for connecting and detecting an external input power supply; the relay control module is used for connecting or disconnecting an input power supply and a load; the controller is connected with the electric signal detection module, the electric signal detection module transmits detected electric signals to the controller, the controller is connected with the relay control module, and the controller controls the relay control module according to the detected electric signals so that the power source and the load can be connected or disconnected. By using the technical scheme of the utility model, the problem of electric shock risk caused by the fact that only one power supply input end is used and other unused power supply input ends are electrified when parallel power supply is adopted in the power supply input circuit can be solved, the use safety of the display screen is improved, and the life and property safety of people is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic and electrical technology, in particular to a power input circuit and a display screen. Background Art

[0002] Display screens present images, videos, text, and other visual information in a visual way. They are widely used in fields including televisions, computer monitors, billboards, security surveillance, information displays, etc.

[0003] Display screens are generally composed of several display cabinets. In order to improve the convenience of wiring, the AC (Alternating Current) power input method between adjacent display cabinets in rows or columns is generally connected in parallel, that is, one display cabinet is often equipped with two AC input plugs, one for the AC power supply of the cabinet, and the other for the power connection of the adjacent cabinet. In this case, when a cabinet only uses one AC power input plug, the other unused AC power input plug will be charged. Therefore, this unused exposed AC power input plug will have a safety hazard of electric shock. Utility Model Content

[0004] The utility model provides a power input circuit to solve the problem of electric shock risk caused by using only one power input terminal and the remaining unused power input terminals being energized when multiple power supplies are connected in parallel in the power input circuit.

[0005] To achieve the above-mentioned purpose, the utility model is implemented as follows: a power input circuit includes a controller and at least two sub-circuits, the sub-circuits include an electrical signal detection module and a relay control module, the electrical signal detection module is used to connect and detect an external input power supply; the relay control module is used to connect or disconnect the input power supply and the load; the controller is connected to the electrical signal detection module, the electrical signal detection module transmits the detected electrical signal to the controller, the controller is connected to the relay control module, and the controller controls the relay control module according to the detected electrical signal to connect or disconnect the input power supply and the load.

[0006] Optionally, the electrical signal detection module includes a current detection module and a voltage detection module for connecting to an input power supply, the current detection module and the relay control module are connected in series, and the voltage detection module is connected in parallel to the current detection module; the controller is connected to the current detection module and the voltage detection module respectively.

[0007] Optionally, a power supply module is further included, which is respectively connected to the current detection module, the voltage detection module, the controller, and the relay control module, and is used to obtain power from the relay control module and supply power to each module.

[0008] Optionally, the current detection module includes a voltage comparator, a first diode and a first photocoupler; the positive electrode of the input end of the voltage comparator is connected in series with the first diode and is used to connect to the phase line end of the input power supply, the negative electrode of the input end of the voltage comparator is connected to the relay control module, the output ends of the voltage comparator are connected to the input ends of the first photocoupler, the collector of the output end of the first photocoupler is connected to the power module, and the emitter of the output end of the first photocoupler is connected to the controller for transmitting electrical signals to the controller.

[0009] Optionally, the current detection module further includes a third resistor and a first capacitor, the third resistor is used to be connected in parallel with two ends of the input power supply, and the first capacitor is connected in parallel with two ends of the input of the voltage comparator.

[0010] Optionally, the voltage detection module includes a third photocoupler and a third diode, the positive electrode of the third photocoupler input end is connected in series with the third diode and used to connect to the phase line end of the input power supply, the negative electrode of the third photocoupler input end is used to connect to the neutral line end of the input power supply, the collector of the third photocoupler output end is connected to the power module, and the emitter of the third photocoupler output end is connected to the controller for transmitting electrical signals to the controller.

[0011] Optionally, the voltage detection module also includes a resistor and a third capacitor; one end of the resistor is connected to the cathode of the third diode, and the other end of the resistor is connected to the anode of the third photocoupler input; the third capacitor is connected in parallel to both ends of the input of the third photocoupler.

[0012] Optionally, the relay control module includes two control sub-modules with the same structure, and the control sub-module includes a first transistor and a first relay; the input end of the first transistor is connected to the controller for receiving a control signal, and the output end of the first transistor is connected to the electromagnetic coil of the first relay, and the electromagnetic coil drives the opening or closing of two contacts of the first relay according to the current size; one contact of the first relay is used to connect the input power supply passing through the current detection module, and the other contact is used to connect the load.

[0013] Optionally, the two control submodules with the same structure are a first control submodule and a second control submodule, one contact of the relay of the first control submodule is used to connect the phase line terminal of the input power supply, another contact of the relay of the first control submodule is used to connect the load, one contact of the relay of the second control submodule is used to connect the neutral line terminal of the input power supply, and another contact of the relay of the second control submodule is used to connect the load.

[0014] The utility model also provides a display screen, comprising the above-mentioned power input circuit and a display unit, wherein the display unit is electrically connected to the power input circuit, and the power input circuit is used to connect multiple input power sources and provide input power to the display unit.

[0015] In the technical solution of the utility model, multiple sub-circuits are connected respectively through a controller, and whether there is power input in all sub-circuits is continuously detected to link the on / off state of the sub-circuits: any sub-circuit with power input is turned on, and the other sub-circuits without power input are turned off. It can be seen that the structure of the utility model can solve the problem of electric shock risk when multiple parallel power supply is used in the power input circuit because only one power input terminal is used and the other unused power input terminals are charged, thereby improving the safety of the display screen and protecting people's lives and property safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0018] Figure 2 This is a structural schematic diagram of another embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of an embodiment of the sub-circuit of the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of an embodiment of the utility model including a power module;

[0021] Figure 5 This is a schematic diagram of the circuit structure of an embodiment of a current detection module;

[0022] Figure 6A schematic diagram of the circuit structure of another embodiment of a current detection module;

[0023] Figure 7 This is a schematic diagram of the circuit structure of an embodiment of a voltage detection module;

[0024] Figure 8 A schematic diagram of the circuit structure of another embodiment of a voltage detection module;

[0025] Fig. 9 It is a circuit structure diagram of an embodiment of a relay control module;

[0026] Fig.10 This is a schematic structural diagram of an embodiment of the display screen of the utility model;

[0027] Description of Figure Numbers:

[0028] name Label name Label Voltage Comparator U1 Eighth resistor R8 First photocoupler EL1 Fifth diode D5 The first diode D1 Thirteenth Resistor R13 First capacitor C1 15th Resistor R15 First resistor R1 The first transistor T1 The third resistor R3 First relay Re1 The third diode D3 The seventh diode D7 Fifth resistor R5 Resistor No. 17 R17 The sixth resistor R6 19th Resistor R19 Seventh resistor R7 The third transistor T3 The third capacitor C3 The third relay Re3

[0029] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The utility model provides a power input circuit which can solve the problem of electric shock risk caused by using only one power input terminal and leaving the remaining unused power input terminals energized when multiple power supplies are connected in parallel in the power input circuit.

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0032] Embodiment 1

[0033] See also Figure 1 , 2 As shown, a power input circuit includes a controller and at least two sub-circuits, the sub-circuit includes an electrical signal detection module and a relay control module, the electrical signal detection module is used to connect and detect an external input power supply, and the relay control module is used to connect or disconnect the input power supply and the load; the controller is connected to the electrical signal detection module, the electrical signal detection module transmits the detected electrical signal to the controller, the controller is connected to the relay control module, and the controller controls the relay control module according to the detected electrical signal to connect or disconnect the input power supply and the load.

[0034] The controller is a microcontroller, which is an integrated circuit that integrates functions such as a central processing unit (CPU), memory, input / output ports and timers, and is used to control the operation of electronic equipment or systems.

[0035] The power input signal is detected by the electrical signal detection module and then output to the relay control module, which then turns on or off the connection between the load and the input power according to the instructions of the controller. The connection between the load and the input power is controlled by the controller according to whether the electrical signal detection module detects the power supply.

[0036] When in use, when the first subcircuit is connected to the AC1 input power supply, the electric signal detection module of the first subcircuit will detect the electric signal. If the electric signal detection module of the second subcircuit does not detect the electric signal input, the controller controls the relay control module of the first subcircuit to turn on and the relay control module of the second subcircuit to turn on and off according to the electric signal detected by the electric signal detection module in the first subcircuit and the result that the electric signal detection module in the second subcircuit does not detect the electric signal. Thus, the AC1 input power supplies power to the load through the electric signal detection module and the relay control module of the first subcircuit, and because the second subcircuit is disconnected, the AC1 input power current connected to the load cannot flow to the input end of the second subcircuit.

[0037] Similarly, when the second sub-circuit is connected to the AC2 input power supply, the electrical signal detection module of the second sub-circuit will detect the electrical signal. If the electrical signal detection module of the first sub-circuit is not connected to the AC1 input power supply, the controller will control the relay control module of the second sub-circuit to be turned on, and at the same time control the relay control module of the first sub-circuit to be disconnected, so that the AC2 input power current connected to the load cannot flow to the input end of the first sub-circuit.

[0038] If the first sub-circuit and the second sub-circuit are both connected to the AC input power supply, the controller will control the relay control modules of the two sub-circuits to turn on the circuits, so that the two power supplies can supply power to the load at the same time.

[0039] In addition, the structure of the present invention is not limited to having only two input power sources, such as Figure 2 As shown, when there are more than two input power sources, the structure of each sub-circuit is the same, and the controller will control multiple sub-circuits at the same time, and its working principle is also as described above. When in use, when the first sub-circuit is connected to the input of power source 1, if the Nth sub-circuit is not connected to the input of power source N, the controller controls the first sub-circuit to be turned on and the Nth sub-circuit to be turned off according to the electrical signal detected by the first sub-circuit and the result that the Nth sub-circuit does not detect the electrical signal, thereby forming the power source 1 input to supply power to the load through the first sub-circuit. Since the Nth sub-circuit is turned off, the input current of the power source 1 connected to the load cannot flow to the input end of the Nth sub-circuit.

[0040] By using the power input circuit of the utility model, the problem of the risk of electric shock caused by only using one power input terminal and the remaining unused power input terminals being energized when multiple parallel power supplies are adopted in the power input circuit can be solved, thereby improving the safety of the display screen and protecting people's lives and property safety.

[0041] Embodiment 2

[0042] On the basis of Example 1, further, the electrical signal detection module includes a current detection module and a voltage detection module for connecting to an input power supply, the current detection module and the relay control module are connected in series, and the voltage detection module is connected in parallel with the current detection module; the controller is connected to the current detection module and the voltage detection module respectively.

[0043] like Figure 3 As shown, since the method for detecting whether the AC input power supply exists requires detecting the voltage and the current at the same time, the connection structure is as follows: the voltage detection module is connected in parallel with both ends of the input power supply. The current detection module is connected in series with the phase line of the AC input power supply, that is, the phase line end of the AC input power supply is connected to the relay control module after passing through the current detection module, and then connected to the load terminal through the relay control module.

[0044] The principle by which the controller determines whether there is AC input power in the subcircuit is as follows:

[0045] First, the on / off state of the relay control module is identified. When the relay control module is in the on state, the current signal in the current detection module and the voltage signal in the voltage detection module in the subcircuit are detected simultaneously: if both the current value and the voltage value exist, it is judged that there is an input power supply; if either the current value or the voltage value is zero, it is judged that there is no AC input power supply.

[0046] When the relay control module is in the off-circuit state, it is only necessary to detect the voltage value of the voltage detection module in the subcircuit: if there is a voltage value, it is determined that there is an AC input power supply; if the voltage value is zero, it is determined that there is no AC input power supply.

[0047] The controller sends instructions to the relay control module according to the above judgment results, so as to realize the conduction or disconnection of the sub-circuit: when there is AC input power, the relay control module conducts the circuit; when there is no AC input power, the relay control module disconnects the circuit.

[0048] Embodiment 3

[0049] like Figure 4As shown, on the basis of the second embodiment, the sub-circuit further includes a power module, which is respectively connected to the controller, the current detection module, and the voltage detection module, and is used to obtain power from the relay control module and supply power to each module. In addition, the power module can be powered by a button battery or other batteries.

[0050] Embodiment 4

[0051] like Figure 5 As shown, on the basis of the second embodiment, further, the current detection module includes a voltage comparator U1, a first diode D1 and a first photocoupler EL1; the positive electrode of the input end of the voltage comparator U1 is connected in series with the first diode and is used to connect to the phase line end of the AC input power supply, the negative electrode of the input end of the voltage comparator U1 is connected to the relay control module, the output ends of the voltage comparator U1 are connected to the input ends of the first photocoupler EL1, the collector of the output end of the first photocoupler EL1 is connected to the power module, and the emitter of the output end of the first photocoupler EL1 is connected to the controller for transmitting electrical signals to the controller.

[0052] The working principle of the current detection module of the present invention is as follows: when the input end of the voltage comparator detects a current signal, an electrical signal will be generated at the output end of the voltage comparator. Due to the guiding effect of the first diode, the electrical signal is input to the light-emitting diode of the photoelectric coupler. The light-emitting diode conducts electricity and emits light, and then couples out the electrical signal at the output end of the photoelectric coupler, thereby realizing the detection of the current value and transmitting the electrical signal to the controller.

[0053] The current detection module of the utility model can detect whether the current in the sub-circuit exists, provide a reference signal for the controller, and provide a guarantee for accurately controlling the conduction or disconnection of the circuit.

[0054] Embodiment 5

[0055] like Figure 6 As shown, based on the third embodiment, the current detection module further includes a third resistor R3 and a first capacitor C1, the third resistor R3 is used to be connected in parallel with both ends of the input power supply, and the first capacitor C1 is connected in parallel to both ends of the input of the voltage comparator U1.

[0056] In order to make the current detection of the sub-circuit more accurate, the first capacitor C1 is connected in parallel to the input ends of the voltage comparator U1 in this embodiment, which can filter the circuit and reduce the noise in the circuit, thus providing a guarantee for the stability of the circuit signal. In addition, the two ends of the third resistor R3 are respectively connected to the phase line end and the neutral line end of the AC input power supply, which has the functions of current limitation and adjusting circuit characteristics, and the resistor R3 can also be replaced by PCB routing.

[0057] In addition, the collector of the output end of the photocoupler E1 is connected in series with the first resistor R1 and then connected to the power module to obtain power. The resistor can limit the current in the circuit, thereby protecting the photocoupler E1 in the circuit from excessive current shock.

[0058] Embodiment 6

[0059] like Figure 7 As shown, on the basis of the second embodiment, further, the voltage detection module includes a third photoelectric coupler EL3 and a third diode D3, the positive electrode of the input end of the third photoelectric coupler EL3 is connected in series with the third diode D3 and is used to connect the phase line end of the AC input power supply, the negative electrode of the input end of the third photoelectric coupler is used to connect the neutral line end of the AC input power supply, the collector of the output end of the third photoelectric coupler EL3 is connected to the power module, and the emitter of the output end of the third photoelectric coupler EL3 is connected to the controller for transmitting an electrical signal to the controller.

[0060] The working principle of the voltage detection module of the utility model is as follows: when the two ends of the light-emitting diode of the photoelectric coupler detect the existence of a voltage difference, the light-emitting diode emits light due to conduction and then couples an electrical signal at the output end of the photoelectric coupler, thereby forming an electrical signal output. In this way, the voltage value is detected and the electrical signal is transmitted to the controller.

[0061] The voltage detection module of the utility model can detect whether the voltage in the sub-circuit exists, provide a reference signal for the controller, and provide a guarantee for accurately controlling the conduction or disconnection of the circuit.

[0062] Embodiment 7

[0063] like Figure 8 As shown, on the basis of Example 5, further, the voltage detection module also includes a resistor and a third capacitor C3; one end of the resistor is connected to the cathode of the third diode D3, and the other end of the resistor is connected to the anode of the input end of the third photocoupler EL3; the third capacitor C3 is connected in parallel to both ends of the input of the third photocoupler EL3.

[0064] In order to make the voltage detection of the sub-circuit more accurate, the third capacitor C3 is connected in parallel to the input terminals of the third photocoupler EL3 in this embodiment, which can filter the circuit and reduce the noise in the circuit, thus ensuring the stability of the circuit signal.

[0065] In addition, there can be multiple resistors connected between the third diode D3 and the positive electrode of the input end of the third photocoupler EL3, which can be set according to the size of the actual circuit. Its main purpose is to limit the current and adjust the circuit characteristics. The collector of the output end of the third photocoupler EL3 is connected in series with the resistor R8 and then connected to the power module. Its role is the same as that of the above-mentioned resistor in the circuit.

[0066] Embodiment 8

[0067] like Fig. 9 As shown, the relay control module includes two control submodules with the same structure, and the control submodule includes a first transistor T1 and a first relay Re1; the input end of the first transistor T1 is connected to the controller for receiving a control signal, and the output end of the first transistor T1 is connected to the electromagnetic coil of the first relay Re1, and the electromagnetic coil drives the opening or closing of two contacts of the first relay Re1 according to the current size; one contact of the first relay Re1 is used to connect the input power supply passing through the current detection module, and the other contact is used to connect the load.

[0068] In addition, the relay control module also includes a thirteenth resistor R13, a fifteenth resistor R15, and a fifth diode D5, wherein one end of the thirteenth resistor R13 is connected to the base of the first transistor T1, and the other end is used to connect to the controller; one end of the fifteenth resistor R15 is connected to the base of the first transistor T1, and the other end is grounded; the collector of the first transistor T1 is connected to one end of the electromagnetic coil of the first relay Re1; the emitter of the first transistor T1 is grounded; the anode of the fifth diode D5 is connected to the collector of the first transistor T1, and the cathode of the fifth diode D5 is connected to the other end of the electromagnetic coil of the first relay Re1.

[0069] By using the relay control module of the utility model, the current size of the relay electromagnetic coil can be driven according to the electrical signal transmitted by the controller, thereby driving the switch or closing of the relay output point, thereby realizing the conduction or short-circuit function of the circuit.

[0070] Embodiment 9

[0071] like Fig. 9 As shown, on the basis of Example 8, further, two control submodules with the same structure are a first control submodule and a second control submodule, one contact of the relay of the first control submodule is used to connect the phase line terminal of the AC input power supply, another contact of the relay of the first control submodule is used to connect the load, one contact of the relay of the second control submodule is used to connect the neutral line terminal of the AC input power supply, and another contact of the relay of the second control submodule is used to connect the load.

[0072] The second control submodule includes a third transistor T3, a seventeenth resistor R17, a nineteenth resistor R19, a seventh diode D7 and a third relay Rel3. The connection relationship of the above components is the same as the structure of the first control submodule, see Figure 7 , I will not repeat it again.

[0073] Since the power supply has two ports, one is the phase line terminal and the other is the neutral line terminal, in order to realize the circuit conduction and disconnection functions, two control submodules are required to control the two ports respectively.

[0074] By using the relay control module of the utility model, the switching or closing of the phase line end and the neutral line end of the input power supply can be controlled respectively according to the electrical signal transmitted by the controller, thereby realizing the conduction or short-circuit function of the circuit.

[0075] Embodiment 10

[0076] The utility model also provides a display screen, such as Fig.10 As shown, it includes a display unit and the above-mentioned power input circuit, the display unit is connected to the power input circuit, and the power input circuit is used to provide input power to the display unit.

[0077] The display screen of the utility model has multiple power input ports. When any power input port is connected to a power source, under the control of the power input circuit, the unconnected power input port will not generate current, thereby effectively preventing the risk of electric shock and ensuring the safety of people's lives and property.

[0078] The above description is only an optional embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A power input circuit, characterized in that: It includes a controller and at least two sub-circuits, wherein the sub-circuit includes an electrical signal detection module and a relay control module. The electrical signal detection module is used to connect and detect an external input power supply; The relay control module is used to connect or disconnect the input power supply and the load; The controller is connected to the electrical signal detection module, and the electrical signal detection module transmits the detected electrical signal to the controller. The controller is connected to the relay control module, and the controller controls the relay control module according to the detected electrical signal to connect or disconnect the input power supply and the load.

2. The power input circuit according to claim 1, characterized in that: The electrical signal detection module includes a current detection module and a voltage detection module for connecting to an input power supply, the current detection module and the relay control module are connected in series, and the voltage detection module is connected in parallel to the current detection module; the controller is connected to the current detection module and the voltage detection module respectively.

3. The power input circuit according to claim 2, characterized in that: It also includes a power supply module, which is respectively connected to the current detection module, the voltage detection module, the controller, and the relay control module, and is used to obtain power from the relay control module and supply power to each module.

4. The power input circuit according to claim 3, characterized in that: The current detection module includes a voltage comparator, a first diode and a first photoelectric coupler; the positive electrode of the input end of the voltage comparator is connected in series with the first diode and is used to connect to the phase line end of the input power supply, the negative electrode of the input end of the voltage comparator is connected to the relay control module, the output ends of the voltage comparator are connected to the input ends of the first photoelectric coupler, the collector of the output end of the first photoelectric coupler is connected to the power module, and the emitter of the output end of the first photoelectric coupler is connected to the controller for transmitting an electrical signal to the controller.

5. The power input circuit according to claim 4, characterized in that: The current detection module further includes a third resistor and a first capacitor, wherein the third resistor is used to be connected in parallel with two ends of an input power supply, and the first capacitor is connected in parallel with two ends of an input of the voltage comparator.

6. The power input circuit according to claim 3, characterized in that: The voltage detection module includes a third photoelectric coupler and a third diode. The positive electrode of the input end of the third photoelectric coupler is connected in series with the third diode and is used to connect to the phase line end of the input power supply. The negative electrode of the input end of the third photoelectric coupler is used to connect to the neutral line end of the input power supply. The collector of the output end of the third photoelectric coupler is connected to the power module, and the emitter of the output end of the third photoelectric coupler is connected to the controller for transmitting an electrical signal to the controller.

7. The power input circuit according to claim 6, characterized in that: The voltage detection module also includes a resistor and a third capacitor; one end of the resistor is connected to the cathode of the third diode, and the other end of the resistor is connected to the anode of the input end of the third photocoupler; the third capacitor is connected in parallel to both ends of the input of the third photocoupler.

8. The power input circuit according to claim 2, characterized in that: The relay control module includes two control submodules with the same structure, and the control submodule includes a first transistor and a first relay; the input end of the first transistor is connected to the controller for receiving a control signal, and the output end of the first transistor is connected to the electromagnetic coil of the first relay, and the electromagnetic coil drives the opening or closing of two contacts of the first relay according to the current size; one contact of the first relay is used to connect the input power supply passing through the current detection module, and the other contact is used to connect the load.

9. The power input circuit according to claim 8, characterized in that: The two control submodules with the same structure are a first control submodule and a second control submodule, one contact of the relay of the first control submodule is used to connect the phase line terminal of the input power supply, and another contact of the relay of the first control submodule is used to connect the load, one contact of the relay of the second control submodule is used to connect the neutral line terminal of the input power supply, and another contact of the relay of the second control submodule is used to connect the load.

10. A display screen, characterized in that: It comprises a power input circuit and a display unit as claimed in any one of claims 1 to 9, wherein the display unit is connected to the power input circuit, and the power input circuit is used to provide input power to the display unit.

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