CN215420091U - Display device and alternating current-direct current power supply circuit thereof - Google Patents
Display device and alternating current-direct current power supply circuit thereof Download PDFInfo
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- CN215420091U CN215420091U CN202121561690.XU CN202121561690U CN215420091U CN 215420091 U CN215420091 U CN 215420091U CN 202121561690 U CN202121561690 U CN 202121561690U CN 215420091 U CN215420091 U CN 215420091U
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Abstract
The utility model discloses a display device and an alternating current-direct current power supply circuit thereof, which comprise an alternating current power supply circuit, a power supply circuit and a power supply control circuit, wherein the alternating current power supply circuit is connected with an alternating current signal input source and is used for accessing an alternating current signal to supply power to a load; the direct current power supply circuit is connected with the direct current signal input source and used for accessing a direct current signal to supply power to a load; the control circuit is respectively connected with the alternating current power supply circuit and the direct current power supply circuit, when the control circuit acquires an alternating current signal output by the alternating current power supply circuit, the control circuit controls the alternating current signal input source to be connected with the load and disconnects the direct current input source from the load, and the power supply mode of the load supplies power to the alternating current power supply circuit; and when the alternating current signal is not acquired, controlling the direct current signal input source and the load to be connected, and switching the power supply mode of the load to the direct current power supply circuit to supply power. Therefore, the alternating current and direct current power supply circuit selects the alternating current power supply circuit to supply power when alternating current is input, and selects the direct current power supply circuit to supply power when no alternating current is input, so that the control of the power supply mode of the load is realized.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a display device and an alternating current and direct current power supply circuit thereof.
Background
With the vigorous development of science and technology, the television becomes one of the ways for people to entertain, relax and understand the current affairs. However, the power grid of some countries is unstable, which greatly affects the user experience. In order to solve the problem, a television with an alternating current/direct current power supply circuit is provided, and when a power grid fails, the television can be supplied with power through a storage battery, so that uninterrupted operation of the television is realized, and user experience is improved.
The current load with the alternating current and direct current power supply circuit cannot identify whether the load is supplied by alternating current or direct current, so that the power supply mode of the load cannot be controlled.
Therefore, how to control the power supply manner of the load is an urgent problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a display device and an alternating current and direct current power supply circuit thereof, which are used for realizing a power supply mode for controlling a load.
In order to solve the above technical problem, the present invention provides an ac/dc power supply circuit, including:
the alternating current power supply circuit is connected with the alternating current signal input source and used for accessing an alternating current signal to supply power to a load;
the direct current power supply circuit is connected with the direct current signal input source and used for accessing a direct current signal to supply power to the load;
and the control circuit is respectively connected with the alternating current power supply circuit and the direct current power supply circuit, controls the alternating current signal input source to be connected with the load and disconnects the direct current signal input source from the load when the alternating current signal is obtained, and otherwise controls the direct current signal input source to be connected with the load.
Preferably, the control circuit includes:
the circuit comprises a first resistor, a second resistor, a first capacitor and a PMOS;
the first end of the first resistor is connected with the output end of the alternating current power supply circuit, the second end of the first resistor is connected with the first end of the second resistor, the first end of the first capacitor and the grid electrode of the PMOS, the second end of the second resistor, the second end of the first capacitor and the common end of the source electrode of the PMOS are connected with the direct current power supply circuit, and the drain electrode of the PMOS is connected with the load.
Preferably, the control circuit further includes:
the device comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an NPN type triode and a control mainboard;
the first end of the third resistor is connected with the output end of the alternating current power supply circuit, the second end of the third resistor is connected with the first end of the fourth resistor and the first end of the fifth resistor, the second end of the fourth resistor is grounded, the second end of the fifth resistor is connected with the base electrode of the NPN type triode, the emitter of the NPN type triode is grounded, the collector of the NPN type triode is connected with the first end of the sixth resistor and the first end of the seventh resistor, the second end of the sixth resistor is connected with the control mainboard, and the second end of the seventh resistor is connected with the power supply.
Preferably, the dc power supply circuit includes:
and the input end of the BUCK-BOOST circuit is connected with the drain electrode of the PMOS, and the output end of the BUCK-BOOST circuit is connected with the load.
Preferably, the dc power supply circuit further includes:
a first fuse and a first diode;
the first end of the first fuse is connected with the direct current signal input source, the second end of the first fuse is connected with the anode of the first diode, and the cathode of the first diode is connected with the second end of the second resistor.
Preferably, the dc power supply circuit further includes:
the input end of the undervoltage protection circuit is connected with the direct current signal input source, the output end of the undervoltage protection circuit is connected with an EN port of a control chip of the BUCK-BOOST circuit, and the control chip starts to work when detecting that the voltage of the EN port is higher than threshold voltage.
Preferably, the under-voltage protection circuit includes:
the circuit comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a PNP type triode and a voltage stabilizing diode;
the first end of the eighth resistor and the second end of the eleventh resistor are connected with the direct-current signal input source, the second end of the eighth resistor is connected with the first end of the ninth resistor and the anode of the zener diode, the second end of the ninth resistor, the anode of the zener diode and the first end of the tenth resistor are grounded together, the cathode of the zener diode is connected with the base electrode of the PNP type triode, the second end of the tenth resistor is connected with the collector electrode of the PNP type triode and the EN port of the control chip, and the first end of the eleventh resistor is connected with the emitter electrode of the zener diode.
Preferably, the alternating current power supply circuit comprises a flyback switching power supply circuit;
the input end of the flyback switching power supply circuit is connected with the alternating current signal input source, and the output end of the flyback switching power supply circuit is connected with the first end of the first resistor, the first end of the third resistor and the load.
Preferably, the ac power supply circuit further includes:
a second fuse;
and the first end of the second fuse is connected with the alternating current signal input source, and the second end of the second fuse is connected with the input end of the flyback switching power supply circuit.
In order to solve the above technical problem, the present invention provides a display device including the above-mentioned ac/dc power supply circuit.
The alternating current-direct current power supply circuit comprises an alternating current power supply circuit, a power supply circuit and a power supply circuit, wherein the alternating current power supply circuit is connected with an alternating current signal input source and used for accessing an alternating current signal to supply power to a load; the direct current power supply circuit is connected with the direct current signal input source and used for accessing a direct current signal to supply power to a load; and the control circuit is respectively connected with the alternating current power supply circuit and the direct current power supply circuit, controls the alternating current signal input source to be connected with the load and disconnects the direct current input source from the load when the alternating current signal is obtained, and otherwise controls the direct current signal input source to be connected with the load. When the alternating current-direct current power supply circuit works, when the control circuit acquires an alternating current signal output by the alternating current power supply circuit, the alternating current signal input source is controlled to be connected with the load, the connection between the direct current input source and the load is disconnected, and the power supply mode of the load supplies power to the alternating current power supply circuit; and when the alternating current signal is not acquired, controlling the direct current signal input source and the load to be connected, and switching the power supply mode of the load to the direct current power supply circuit to supply power. Therefore, the alternating current and direct current power supply circuit selects the alternating current power supply circuit to supply power when alternating current is input, and selects the direct current power supply circuit to supply power when no alternating current is input, so that the control of the power supply mode of the load is realized.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in 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 that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a circuit diagram of an ac/dc power supply circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a DC power supply circuit in the AC/DC power supply circuit shown in FIG. 1;
FIG. 3 is a circuit diagram of a control circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of an under-voltage protection circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of an ac power supply circuit in the ac/dc power supply circuit shown in fig. 1.
The reference numbers are as follows: the power supply circuit comprises an alternating current power supply circuit 1, an alternating current signal input source 2, a direct current power supply circuit 3, a direct current signal input source 4, a control circuit 5, a load 6, an EMI filter circuit 7, a bridge rectifier circuit 8 and an absorption circuit 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
The core of the utility model is to provide a display device and an alternating current and direct current power supply circuit thereof, which are used for controlling the power supply mode of a load 6 to supply power to an alternating current power supply circuit 1 when an alternating current signal is input, and controlling the power supply mode of the load 6 to supply power to a direct current power supply circuit 3 when no alternating current signal is input.
In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.
It should be noted that the ac/dc POWER supply circuit is generally used for televisions in areas where the POWER supply system is unstable or special display devices that need to operate without interruption, and when the ac/dc POWER supply circuit is applied to televisions and there is no commercial POWER supply, for example, when the POWER supply circuit is powered off or used in vehicles, the ac/dc POWER supply circuit supplies POWER to the televisions through the direct current output by the storage battery POWER, and the commercial POWER is selected to supply POWER when the commercial POWER is supplied, so that uninterrupted operation of the televisions is realized, and user experience is improved. When the method is applied to special display equipment, uninterrupted work of the display equipment is realized, display interruption caused by power failure is avoided, and instantaneity of the display equipment is guaranteed.
Fig. 1 is a circuit diagram of an ac/dc power supply circuit according to an embodiment of the present invention, and as shown in fig. 1, the ac/dc power supply circuit includes:
the alternating current power supply circuit 1 is connected with the alternating current signal input source 2 and used for accessing an alternating current signal to supply power to the load 6;
the direct current power supply circuit 3 is connected with the direct current signal input source 4 and used for accessing a direct current signal to supply power to the load 6;
and the control circuit 5 is respectively connected with the alternating current power supply circuit 1 and the direct current power supply circuit 3, controls the alternating current signal input source 2 to be connected with the load 6 and disconnects the direct current signal input source 4 from the load 6 when alternating current signals are obtained, and otherwise controls the direct current signal input source 4 to be connected with the load 6.
The alternating current signal input source 2 generates an alternating current signal, which is usually commercial power, and the alternating current power supply circuit 1 can perform operations such as filtering and rectifying on the alternating current signal after accessing the alternating current signal, and then outputs an optimized current to supply power to the load 6. The dc signal input source 4 is usually a storage battery POWER, and may be a solar battery, of course, the dc voltages generated by the storage batteries POWER of different specifications are also different, and the dc POWER supply circuit 3 may boost or buck the dc signal after receiving the dc signal, so as to output a certain current to supply POWER to the load 6. The dc signal input source 4 may also be charged when not in operation, for multiple uses. The load 6 is typically a display screen, a touch screen, or the like. The control circuit 5 may recognize whether there is an input of an ac signal through a chip, control connection and disconnection of the switch to further control on and off of the ac power supply circuit 1 and the dc power supply circuit 3, or control a power supply mode of the load 6 according to different on conditions of the ac power supply and the dc power supply by the components.
The alternating current-direct current power supply circuit comprises an alternating current power supply circuit, a power supply circuit and a power supply circuit, wherein the alternating current power supply circuit is connected with an alternating current signal input source and used for accessing an alternating current signal to supply power to a load; the direct current power supply circuit is connected with the direct current signal input source and used for accessing a direct current signal to supply power to a load; and the control circuit is respectively connected with the alternating current power supply circuit and the direct current power supply circuit, controls the alternating current signal input source to be connected with the load and disconnects the direct current input source from the load when the alternating current signal is obtained, and otherwise controls the direct current signal input source to be connected with the load. When the alternating current-direct current power supply circuit works, when the control circuit acquires an alternating current signal output by the alternating current power supply circuit, the alternating current signal input source is controlled to be connected with the load, the connection between the direct current input source and the load is disconnected, and the power supply mode of the load supplies power to the alternating current power supply circuit; and when the alternating current signal is not acquired, controlling the direct current signal input source and the load to be connected, and switching the power supply mode of the load to the direct current power supply circuit to supply power. Therefore, the alternating current and direct current power supply circuit selects the alternating current power supply circuit to supply power when alternating current is input, and selects the direct current power supply circuit to supply power when no alternating current is input, so that the control of the power supply mode of the load is realized.
Fig. 2 is a circuit diagram of the dc power supply circuit 3 in the above ac/dc power supply circuit according to an embodiment of the present invention, and as shown in fig. 2, the control circuit 5 includes, in addition to the above embodiment: the circuit comprises a first resistor R1, a second resistor R2, a first capacitor C1 and a PMOS;
the first end of the first resistor R1 is connected with the output end of the alternating current power supply circuit 1, the second end of the first resistor R1 is connected with the first end of the second resistor R2, the first end of the first capacitor C1 and the grid of the PMOS, the second end of the second resistor R2, the second end of the first capacitor C1 and the common end of the source of the PMOS are connected with the direct current power supply circuit 3, and the drain of the PMOS is connected with the load 6.
According to the alternating current/direct current power supply circuit provided by the embodiment of the utility model, when a high level signal output by the alternating current power supply circuit 1 is received, the PMOS is in a non-conduction state, the direct current power supply circuit 3 is further non-conduction, and at the moment, the load 6 is supplied with power by the alternating current power supply circuit 1; when receiving the low level signal output by the alternating current power supply circuit 1, the PMOS is in a conducting state, and then the direct current power supply circuit 3 is conducted, so that the load 6 is supplied with power by the direct current power supply circuit 3, and the method is more automatic compared with a mode of using a chip combination switch.
Fig. 3 is a circuit diagram of a control circuit 5 according to an embodiment of the present invention, and as shown in fig. 3, on the basis of the above embodiment, the control circuit 5 further includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an NPN transistor VT1, and a control board (not shown);
the first end of the third resistor R3 is connected to the output end of the ac power supply circuit 1, the second end of the third resistor R3 is connected to the first end of the fourth resistor R4 and the first end of the fifth resistor R5, the second end of the fourth resistor R4 is grounded, the second end of the fifth resistor R5 is connected to the base of the NPN transistor VT1, the emitter of the NPN transistor VT1 is grounded, the collector of the NPN transistor VT1 is connected to the first end of the sixth resistor R6 and the first end of the seventh resistor R7, the second end of the sixth resistor R6 is connected to the control main board, and the second end of the seventh resistor R7 is connected to the power supply (12V).
According to the alternating current/direct current power supply circuit provided by the embodiment of the utility model, when the signal received by the control mainboard is at a low level, the power supply mode of the load 6 at the moment is judged to be the power supply mode of the alternating current power supply circuit 1, and when the signal received by the control mainboard is at a high level, the power supply mode of the load 6 at the moment is judged to be the power supply mode of the direct current power supply circuit 3. The control main board recognizes that the power supply mode of the load 6 can perform subsequent operations, for example, when recognizing that the load 6 is supplied with power through the direct current supply circuit 3, the control main board can control the display device to enter an energy-saving mode, adjust the duty ratio of the PWM to reduce by half so as to reduce the backlight brightness, reduce the backlight loss, and ensure that the display device can work for a long time.
In a specific implementation, in order to adapt to the POWER storage batteries of different specifications, in the present embodiment, the dc POWER supply circuit 3 includes:
and the input end of the BUCK-BOOST circuit is connected with the drain electrode of the PMOS, and the output end of the BUCK-BOOST circuit is connected with the load 6.
As shown in fig. 2, the BUCK-BOOST circuit specifically includes: a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, an NMOS1, an NMOS2, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a control chip MP4527 and a first inductor L;
a first terminal of the second capacitor C2 is connected to the drain of the PMOS and the drain of the NMOS1, a second terminal of the second capacitor C2 and a first terminal of the third capacitor C3 are commonly grounded, a second terminal of the third capacitor C3 is connected to the VIN port of the control chip MP4527 and the dc signal input source 4, a gate of the NMOS1 is connected to the first terminal of the twelfth resistor R12, a second terminal of the twelfth resistor R12 is connected to the HG1 port of the control chip MP4527, a source of the NMOS1 is connected to the first terminal of the fourth capacitor C4, the SW1 port of the control chip MP4527 and the first terminal of the first inductor L, a second terminal of the fourth capacitor C4 is connected to the BST1 port of the control chip MP4527, a second terminal of the first inductor L is connected to the SW2 port of the control chip MP4527, a first terminal of the fifth capacitor C5 and a source of the NMOS2, a second terminal of the fifth capacitor C6862 is connected to the drain of the control chip 4527, a second terminal of the BST port of the control chip MP 4556, a gate of the NMOS 8653 is connected to the NMOS 8658, a gate of the NMOS 13, a gate of the NMOS 867 of the control chip MP 13, a gate of the NMOS 368627, a gate of the NMOS 13, a gate of the NMOS 368627, the second terminal of the sixth capacitor C6 is grounded, the first terminal of the sixth capacitor C6 and the first terminal of the fourteenth resistor R14 are commonly connected to the load 6, the second terminal of the fourteenth resistor R14 is connected to the first terminal of the fifteenth resistor R15 and the first terminal of the sixteenth resistor R16, the second terminal of the fifteenth resistor R15 is connected to the FB port of the control chip MP4527, the second terminal of the sixteenth resistor R16, the first terminal of the seventh capacitor C7, the first terminal of the eighth capacitor C8, the PGND port of the control chip MP4527 and the AGND port are commonly grounded, the second terminal of the seventh capacitor C7 is connected to the IMON port of the control chip 4527, the second terminal of the eighth capacitor C8 is connected to the VCC port of the control chip MP4527, the first terminal of the seventeenth resistor R17 is connected to the SEN-port of the control chip MP4527, the second terminal of the seventeenth resistor R17, the ISEN + port of the control chip MP4527 and the power supply (SDA 12V), the second terminal of the resistor R854536, the second terminal of the ninth chip MP4527 is commonly grounded, the second end of the twentieth resistor R20 is connected to the ALT port of the control chip MP4527, and the first end of the eighteenth resistor R18, the first end of the nineteenth resistor R19 and the first end of the twentieth resistor R20 are connected to the DC signal input source 4.
When receiving the direct-current signals output by the storage batteries POWER of different specifications, the BUCK-BOOST circuit in the direct-current POWER supply circuit 3 can increase or decrease the voltage, and outputs a certain voltage to supply POWER to the load 6, so that the alternating-current and direct-current POWER supply circuit is suitable for the storage batteries POWER of different specifications.
As shown in fig. 2, in the embodiment, the dc POWER supply circuit 3 may have an overcurrent phenomenon, which easily causes damage to the battery POWER, and when the load 6 is powered by the ac POWER supply circuit 3, the voltage output by the ac POWER supply circuit 1 also easily flows back to the battery POWER, for this reason, on the basis of the above embodiment, in this embodiment, the dc POWER supply circuit 3 further includes:
a fuse F1 and a first diode D1;
the first terminal of the fuse F1 is connected to the dc signal input source 4, the second terminal of the fuse F1 is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the second terminal of the second resistor R2.
According to the alternating current/direct current POWER supply circuit 3 provided by the embodiment of the utility model, the fuse F1 is arranged on the direct current POWER supply circuit 3 and is disconnected when the direct current POWER supply circuit 3 is in overcurrent, so that the effect of protecting the storage battery POWER is achieved. The first diode D1 can prevent the voltage output by the AC POWER supply circuit 1 from flowing back into the storage battery POWER, thus realizing the protection of the storage battery POWER.
In the specific implementation, when the load 6 is powered by the dc POWER supply circuit for a long time, the storage battery POWER is easily damaged due to overuse, and on the basis of the above embodiment, in this embodiment, the dc POWER supply circuit 3 further includes: fig. 4 is a circuit diagram of an under-voltage protection circuit according to an embodiment of the present invention, an input end of the under-voltage protection circuit is connected to the dc signal input source 4, an output end of the under-voltage protection circuit is connected to an EN port of a control chip MP4527 of the BUCK-BOOST circuit, and the control chip MP4527 starts to operate when detecting that a voltage of the EN port is higher than a threshold voltage.
According to the alternating current-direct current POWER supply circuit 3 provided by the embodiment of the utility model, the direct current POWER supply circuit 3 is internally provided with the undervoltage protection circuit, and the alternating current-direct current POWER supply circuit enters a protection state after the voltage of the storage battery POWER is reduced to a set threshold value, so that the storage battery POWER is prevented from being damaged due to overuse.
As shown in fig. 4, the undervoltage protection circuit includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a PNP type triode VT2 and a zener diode D4;
the first end of the eighth resistor R8 and the second end of the eleventh resistor R11 are connected with the direct current signal input source 4, the second end of the eighth resistor R8 is connected with the first end of the ninth resistor R9 and the anode of the zener diode D4, the second end of the ninth resistor R9, the anode of the zener diode D4 and the first end of the tenth resistor R10 are grounded in common, the cathode of the zener diode D4 is connected with the base of the PNP type triode VT2, the second end of the tenth resistor R10 is connected with the collector of the PNP type triode VT2 and the EN port of the control chip MP4527, and the first end of the eleventh resistor R11 is connected with the emitter of the zener diode D4.
Fig. 5 is a circuit diagram of an ac power supply circuit 1 in the above ac/dc power supply circuit according to an embodiment of the present invention, and as shown in fig. 5, the ac power supply circuit 1 includes a flyback switching power supply circuit;
the input end of the flyback switching power supply circuit is connected with the alternating current signal input source 2, and the output end of the flyback switching power supply circuit is connected with the first end of the first resistor R1, the first end of the third resistor R3 and the load 6.
The flyback switching power supply circuit specifically comprises: the circuit comprises an EMI filter circuit 7, a bridge rectifier circuit 8, an absorption circuit 9, a transformer L2, a second diode D2, a control chip FA5643, an NMOS3, a twenty-first resistor R21, a twenty-second resistor R22, a third diode D3, a first thin-film capacitor c1, a second thin-film capacitor c2 and a third thin-film capacitor c 3;
the input end of the EMI filter circuit 7 is connected with the alternating current signal input source 2, the output end of the EMI filter circuit 7 is connected with the input end of the bridge rectifier circuit 8, the output end of the bridge rectifier circuit 8 is connected with the first end of the first thin-film capacitor c1, the input end of the absorption circuit 9 and the primary winding of the transformer L2, the grounding end of the bridge rectifier circuit 8 and the second end of the first thin-film capacitor c1 are grounded in common, the second end of the primary winding of the transformer L2 is connected with the output end of the absorption circuit and the drain electrode of the NMOS3, the grid electrode of the NMOS3 is connected with the first end of the twenty-first resistor R21, the second end of the twenty-first resistor R21 is connected with the OUT port of the control chip FA5643, the source electrode of the NMOS3 is connected with the first end of the twenty-second resistor R22, the first end of the twenty-second resistor R22 is grounded, the first end of the first secondary winding of the transformer L2 is connected with the positive electrode of the second diode D2, the negative electrode of the second diode D2 is connected with the first end of the second thin-film capacitor c2 and the load 6, the second end of the first secondary winding of the transformer L2 and the second end of the first thin-film capacitor c1 are grounded in common, the first end of the second secondary winding of the transformer L2 is connected to the anode of the third diode D3, the cathode of the third diode D3 is connected to the first end of the third thin-film capacitor c3 and the first ends of the first resistor R1 and the third resistor R3, and the second end of the second secondary winding of the transformer L2 and the cathode of the third diode D3 are grounded in common.
In the AC/dc power supply circuit provided in the embodiment of the present invention, the flyback switching power supply circuit may perform operations such as rectification and filtering on the received AC signal, output the optimized first current Vout _12V to the load 6 to supply power to the load 6, and output the second current AC _ signal to the control circuit 5 to serve as the output terminal of the AC power supply circuit.
In a specific implementation, the ac power supply circuit 1 may have an overcurrent condition, and in order to protect the ac power supply circuit 1, in this embodiment, the ac power supply circuit 1 further includes:
a second fuse F2;
as shown in fig. 5, a first terminal of the second fuse F2 is connected to the ac signal input source 2, and a second terminal of the second fuse F2 is connected to an input terminal of the EMI filter circuit 7.
In the ac/dc power supply circuit provided in the embodiment of the present invention, the second fuse F2 is disconnected when the ac power supply circuit 1 is overcurrent, so as to achieve the effect of protecting the ac power supply circuit 1.
Finally, an embodiment of the present invention further provides a display device, where the display device includes the ac/dc power supply circuit mentioned in the foregoing embodiment. Since the above detailed description is made for each component, the detailed description is omitted here.
The display equipment provided by the embodiment of the utility model comprises an alternating current power supply circuit, a power supply circuit and a power supply circuit, wherein the alternating current power supply circuit is connected with an alternating current signal input source and is used for accessing an alternating current signal to supply power to a load; the direct current power supply circuit is connected with the direct current signal input source and used for accessing a direct current signal to supply power to a load; and the control circuit is respectively connected with the alternating current power supply circuit and the direct current power supply circuit, controls the alternating current signal input source to be connected with the load and disconnects the direct current input source from the load when the alternating current signal is obtained, and otherwise controls the direct current signal input source to be connected with the load. When the alternating current-direct current power supply circuit works, when the control circuit acquires an alternating current signal output by the alternating current power supply circuit, the alternating current signal input source is controlled to be connected with the load, the connection between the direct current input source and the load is disconnected, and the power supply mode of the load supplies power to the alternating current power supply circuit; and when the alternating current signal is not acquired, controlling the direct current signal input source and the load to be connected, and switching the power supply mode of the load to the direct current power supply circuit to supply power. Therefore, the display equipment selects the alternating current power supply circuit to supply power when alternating current is input, selects the direct current power supply circuit to supply power when no alternating current is input, and realizes control over the power supply mode.
The display device and the ac/dc power supply circuit 3 thereof provided by the present invention are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. An AC/DC power supply circuit, comprising:
the alternating current power supply circuit (1) is connected with the alternating current signal input source (2) and is used for accessing an alternating current signal to supply power to the load (6);
the direct current power supply circuit (3) is connected with the direct current signal input source (4) and is used for connecting a direct current signal to supply power to the load (6);
and the control circuit (5) is respectively connected with the alternating current power supply circuit (1) and the direct current power supply circuit (3), when the alternating current signal is acquired, the alternating current signal input source (2) is controlled to be connected with the load (6), the connection between the direct current signal input source (4) and the load (6) is disconnected, and otherwise, the direct current signal input source (4) and the load (6) are controlled to be connected.
2. Ac/dc supply circuit according to claim 1, characterized in that said control circuit (5) comprises:
the circuit comprises a first resistor, a second resistor, a first capacitor and a PMOS;
the first end of the first resistor is connected with the output end of the alternating current power supply circuit (1), the second end of the first resistor is connected with the first end of the second resistor, the first end of the first capacitor and the grid electrode of the PMOS, the second end of the second resistor, the second end of the first capacitor and the common end of the source electrode of the PMOS are connected with the direct current power supply circuit (3), and the drain electrode of the PMOS is connected with the load (6).
3. The ac-dc supply circuit according to claim 2, characterized in that the control circuit (5) further comprises:
the device comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an NPN type triode and a control mainboard;
the first end of the third resistor is connected with the output end of the alternating current power supply circuit (1), the second end of the third resistor is connected with the first end of the fourth resistor and the first end of the fifth resistor, the second end of the fourth resistor is grounded, the second end of the fifth resistor is connected with the base electrode of the NPN type triode, the emitter of the NPN type triode is grounded, the collector of the NPN type triode is connected with the first end of the sixth resistor and the first end of the seventh resistor, the second end of the sixth resistor is connected with the control mainboard, and the second end of the seventh resistor is connected with the power supply.
4. Ac/dc supply circuit according to claim 2, characterized in that the dc supply circuit (3) comprises:
and the input end of the BUCK-BOOST circuit is connected with the drain electrode of the PMOS, and the output end of the BUCK-BOOST circuit is connected with the load (6).
5. AC/DC supply circuit according to claim 4, characterized in that said DC supply circuit (3) further comprises:
a first fuse and a first diode;
the first end of the first fuse is connected with the direct current signal input source (4), the second end of the first fuse is connected with the anode of the first diode, and the cathode of the first diode is connected with the second end of the second resistor.
6. AC/DC supply circuit according to claim 5, characterized in that said DC supply circuit (3) further comprises:
the input end of the undervoltage protection circuit is connected with the direct current signal input source (4), the output end of the undervoltage protection circuit is connected with an EN port of a control chip of the BUCK-BOOST circuit, and the control chip starts to work when detecting that the voltage of the EN port is higher than threshold voltage.
7. The AC-DC power supply circuit of claim 6, wherein the under-voltage protection circuit comprises:
the circuit comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a PNP type triode and a voltage stabilizing diode;
the first end of the eighth resistor and the second end of the eleventh resistor are connected with the direct current signal input source (4), the second end of the eighth resistor is connected with the first end of the ninth resistor and the anode of the voltage stabilizing diode, the second end of the ninth resistor, the anode of the voltage stabilizing diode and the first end of the tenth resistor are grounded together, the cathode of the voltage stabilizing diode is connected with the base electrode of the PNP type triode, the second end of the tenth resistor is connected with the collector electrode of the PNP type triode and the EN port of the control chip, and the first end of the eleventh resistor is connected with the emitting electrode of the voltage stabilizing diode.
8. AC/DC supply circuit according to claim 3, characterized in that said AC supply circuit (1) comprises a flyback switching power supply circuit;
the input end of the flyback switching power supply circuit is connected with the alternating current signal input source (2), and the output end of the flyback switching power supply circuit is connected with the first end of the first resistor, the first end of the third resistor and the load (6).
9. Ac/dc supply circuit according to claim 8, characterized in that said ac supply circuit (1) further comprises:
a second fuse;
the first end of the second fuse is connected with the alternating current signal input source (2), and the second end of the second fuse is connected with the input end of the flyback switching power supply circuit.
10. A display device comprising the ac-dc power supply circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121561690.XU CN215420091U (en) | 2021-07-09 | 2021-07-09 | Display device and alternating current-direct current power supply circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121561690.XU CN215420091U (en) | 2021-07-09 | 2021-07-09 | Display device and alternating current-direct current power supply circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN215420091U true CN215420091U (en) | 2022-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121561690.XU Active CN215420091U (en) | 2021-07-09 | 2021-07-09 | Display device and alternating current-direct current power supply circuit thereof |
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| Country | Link |
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| CN (1) | CN215420091U (en) |
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2021
- 2021-07-09 CN CN202121561690.XU patent/CN215420091U/en active Active
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