CN216161221U - Remote control circuit and remote controller - Google Patents
Remote control circuit and remote controller Download PDFInfo
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- CN216161221U CN216161221U CN202122212184.6U CN202122212184U CN216161221U CN 216161221 U CN216161221 U CN 216161221U CN 202122212184 U CN202122212184 U CN 202122212184U CN 216161221 U CN216161221 U CN 216161221U
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Abstract
The utility model discloses a remote control circuit and a remote controller, wherein the remote control circuit comprises: the device comprises a key circuit, a control unit, a first switch circuit, a second switch circuit, a signal sending circuit, a first power supply and a second power supply. The key circuit comprises at least one key branch circuit, and the key branch circuit is used for generating a first level signal and a third level signal after being triggered; the first switch circuit is used for establishing the connection between the second power supply and the control unit and between the second power supply and the signal sending circuit when the first end of the first switch circuit receives the first level signal; the control unit is used for outputting a second level signal at the first output end when the power supply end of the control unit is connected with a second power supply, and outputting a corresponding control signal at the second output end when any input end receives a third level signal; the second switch circuit is used for establishing the connection between a second power supply and the power supply end of the control unit when the first end of the second switch circuit receives the second level signal; the input end of the signal sending circuit is connected with the second output end of the control unit and used for receiving the control signal.
Description
Technical Field
The embodiment of the utility model relates to the technical field of remote control, in particular to a remote control circuit and a remote controller.
Background
The remote controller relates to the aspect of daily life, and how to ensure the accurate control of the remote controller and reduce the power consumption as far as possible becomes the problem which needs to be solved at present urgently.
The basis for realizing the accurate control of the remote controller is the accurate identification of the key positions of the remote controller. In the prior art, the key value of the remote controller can be determined by reading a resistor voltage division value connected in series with the key value, specifically, each key is connected in series with a resistor with different resistance values, when a certain key is pressed down, a remote control branch corresponding to the key is conducted, the resistor connected in series with the key is electrified, and the key position of the pressed key can be determined by measuring the voltage division value of the resistor and comparing the voltage division value with a preset key value.
The disadvantages of the above method are: because the key value of a certain key is not only related to the resistor connected in series with the key value, but also related to other resistors in the remote control circuit, the calculation of the resistance voltage division value needs to apply the superposition theorem of the circuit, the calculation process is more complicated, and the calculation and debugging difficulty is increased for the key position determination of the remote control key; in addition, when there are many keys or the combination key needs to be supported, the resistance values of some keys after combination are similar, so that it is difficult to distinguish different key values, and erroneous judgment of key values is caused.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a remote control circuit and a remote controller, which can improve the accuracy of key identification and reduce power consumption.
In a first aspect, there is provided a remote control circuit, the circuit comprising: the device comprises a key circuit, a control unit, a first switch circuit, a second switch circuit, a signal sending circuit, a first power supply and a second power supply;
the key circuit comprises at least one key branch, a first end of each key branch is connected with the first power supply, a second end of each key branch is connected with a first end of the first switch circuit, and a third end of each key branch is connected with one input end of the control unit;
a second end of the first switch circuit is connected with the second power supply, a third end of the first switch circuit is respectively connected with a power supply end of the control unit and a power supply end of the signal sending circuit, and a fourth end of the first switch circuit is connected with the first power supply;
the first end of the second switch circuit is connected with the first output end of the control unit, the second end of the second switch circuit is connected with the second power supply, and the third end of the second switch circuit is respectively connected with the power supply end of the control unit and the power supply end of the signal sending circuit;
the input end of the signal sending circuit is connected with the second output end of the control unit;
the key branch circuit is used for generating a first level signal at a second end of the key branch circuit when being triggered;
the first switch circuit is used for establishing connection between the second power supply and the power end of the control unit and establishing connection between the second power supply and the power end of the signal sending circuit according to the first level signal, so that the second power supply supplies power for the control unit and the signal sending circuit through the first switch circuit, and the control unit and the signal sending circuit are in working states;
the control unit is configured to output a second level signal to the second switch circuit when the control unit is in the operating state, and the second switch circuit is configured to establish a connection between the second power supply and a power end of the control unit according to the second level signal and establish a connection between the second power supply and a power end of the signal transmitting circuit, so that the second power supply supplies power to the control unit and the signal transmitting circuit through the second switch circuit, and the control unit and the signal transmitting circuit maintain the operating state;
the key branch is also used for generating a third level signal at a third end of the key branch when being triggered;
the control unit is further configured to detect a level state of an input end of the control unit connected to each of the key branches when the control unit is in a working state, generate a control signal corresponding to the input end and output the control signal to the signal sending circuit when the third level signal is detected, and output a fourth level signal to the second switch circuit if the third level signal is not detected within a preset time;
the signal transmitting circuit is used for generating a remote control signal according to the control signal and transmitting the remote control signal;
the second switch circuit is further configured to disconnect the second power supply from the power supply terminal of the control unit and disconnect the second power supply from the power supply terminal of the signal transmission circuit according to the fourth level signal, so that the second power supply stops supplying power to the control unit and the signal transmission circuit, and the control unit and the signal transmission circuit stop operating, wherein the second level signal is opposite to the fourth level signal.
In some embodiments, the first switching circuit comprises: the first switch tube and the second switch tube;
the first end of the first switch tube is connected with the second end of each key branch, the second end of the first switch tube is respectively connected with the first power supply and the first end of the second switch tube, and the third end of the first switch tube is grounded;
the second end of the second switch tube is connected with the power supply end of the control unit and the power supply end of the signal sending circuit, and the third end of the second switch tube is connected with the second power supply.
In some embodiments, the second switching circuit comprises: a third switching tube and a fourth switching tube;
the first end of the third switching tube is connected with the second end of the fourth switching tube, the second end of the third switching tube is respectively connected with the power supply end of the control unit and the power supply end of the signal sending circuit, and the third end of the third switching tube is connected with the second power supply;
the first end of the fourth switch tube is connected with the first output end of the control unit, and the third end of the fourth switch tube is grounded.
In some embodiments, the key branch circuit includes a key and an isolation circuit;
the first end of the key is connected with the first power supply, the second end of the key is respectively connected with the first end of the isolation circuit and one input end of the control unit, and the second end of the isolation circuit is connected with the first end of the first switch circuit;
the isolation circuit is used for preventing the current of the second end of the isolation circuit from flowing backwards to the first end of the isolation circuit.
In some embodiments, the isolation circuit comprises a diode;
the anode of the diode is connected with the second end of the key, and the cathode of the diode is connected with the first end of the first switch circuit.
In some embodiments, the key branch further comprises a pull-down resistor;
the first end of the pull-down resistor is connected with the second end of the key, and the second end of the pull-down resistor is grounded.
In some embodiments, the first switching circuit further comprises: the circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor;
the first end of the first resistor is connected with the first power supply, the second end of the first resistor is respectively connected with the second end of the first switch tube and the first end of the fourth resistor, the first end of the second resistor is respectively connected with the first end of the third resistor and the second end of the key branch circuit, the second end of the second resistor is connected with the first end of the first switch tube, the second end of the third resistor is grounded, and the second end of the fourth resistor is connected with the first end of the second switch tube.
In some embodiments, the second switching circuit further comprises: a fifth resistor, a sixth resistor and a seventh resistor;
the first end of the fifth resistor is connected with the first output end of the control unit, the second end of the fifth resistor is connected with the first end of the fourth switching tube, the first end of the sixth resistor is respectively connected with the second end of the fourth switching tube and the first end of the seventh resistor, the second end of the sixth resistor is connected with the first end of the third switching tube, and the second end of the seventh resistor is connected with the third end of the third switching tube.
In some embodiments, the signal transmission circuit comprises a radio frequency chip and an antenna;
the power supply end of the radio frequency chip is respectively connected with the third end of the first switch circuit and the third end of the second switch circuit, the input end of the radio frequency chip is connected with the second output end of the control unit, and the output end of the radio frequency chip is connected with the antenna.
In a second aspect, a remote control is provided, comprising the remote control circuit described above.
Different from the prior art, the embodiment of the utility model provides a remote control circuit, which comprises a key circuit, a first switch circuit, a second switch circuit, a control unit, a signal sending circuit, a first power supply and a second power supply, wherein the control unit determines which key branch is triggered by reading the level of each key branch in the key circuit, and compared with the mode of reading the voltage division value of a series resistor, the process of determining the triggered key branch by detecting the level state of the key branch transmitted to the input end of the control unit is simple and accurate; in addition, compared with the existing remote control circuit, the remote control circuit is additionally provided with the second switch circuit, when any key branch is triggered, the control unit outputs the second level signal to enable the second power supply to be continuously conducted with the power supply end of the control unit and the power supply end of the signal sending circuit, so that the control unit and the radio frequency circuit can always maintain a normal working state, when no key branch is triggered within a period of time, the control unit outputs the fourth level signal to the second switch unit to enable the second power supply to be disconnected with the power supply end of the control unit and the power supply end of the signal sending circuit, the control unit and the signal sending circuit lose power and enter a low power consumption state, and therefore the overall power consumption of the remote control circuit is effectively reduced.
Drawings
One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
Fig. 1 is a schematic structural diagram of a remote control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a remote control circuit according to an embodiment of the present invention.
Detailed Description
The present application will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present application, but are not intended to limit the utility model in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the application. All falling within the scope of protection of the present application.
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It should be noted that, if not conflicted, the various features of the embodiments of the utility model may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a remote control circuit according to an embodiment of the present invention, where the remote control circuit includes a key circuit 10, a first switch circuit 20, a second switch circuit 30, a control unit 40, a signal transmission circuit 50, a first power supply 60, and a second power supply 70.
The key circuit 10 includes at least one key branch, a first end of each key branch is connected to the first power supply 60, a second end of each key branch is connected to the first end of the first switch circuit 20, and a third end of each key branch is further connected to an input end of the control unit 40.
The second terminal of the first switch circuit 20 is connected to the second power supply 70, the third terminal of the first switch circuit 20 is connected to the power supply terminal of the control unit 40 and the power supply terminal of the signal transmitting circuit 50, respectively, and the fourth terminal of the first switch circuit 20 is connected to the first power supply 60.
A first terminal of the second switch circuit 30 is connected to the first output terminal of the control unit 40, a second terminal of the second switch circuit 30 is connected to the second power supply 70, and a third terminal of the second switch circuit 30 is respectively connected to the power supply terminal of the control unit 40 and the power supply terminal of the signal transmitting circuit 50.
An input terminal of the signal transmitting circuit 50 is connected to a second output terminal of the control unit 40.
The key branch in the key circuit 10 is configured to generate a first level signal at a second terminal thereof when activated.
The first switch circuit 20 is used for establishing the connection of the power terminals of the second power supply 70 and the control unit 40 and the connection of the power terminals of the second power supply 70 and the signal transmitting circuit 50 according to the first level signal, so that the second power supply 70 supplies power to the control unit 40 and the signal transmitting circuit 50 through the first switch circuit 20, thereby putting the control unit 40 and the signal transmitting circuit 50 into an operating state.
The control unit 40 is configured to output a second level signal to the second switch circuit 30 when in the operating state, and the second switch circuit 30 is configured to establish a connection between the second power supply 70 and the power supply terminals of the control unit 40 and establish a connection between the second power supply 70 and the power supply terminals of the signal transmitting circuit 50 according to the second level signal, so that the second power supply 70 supplies power to the control unit 40 and the signal transmitting circuit 50 through the second switch circuit 50, thereby maintaining the operating state of the control unit 40 and the signal transmitting circuit 50.
The key branch is also used for generating a third level signal at a third end when being triggered.
The control unit 40 is further configured to detect a level state of an input terminal connected to each key branch when the control unit is in the working state, generate a control signal corresponding to the input terminal and output the control signal to the signal sending circuit 50 when a third level signal is detected, and output a fourth level signal to the second switch circuit 30 if the control unit 40 does not detect the third level signal within a preset time.
The signal transmitting circuit 50 is configured to generate a remote control signal according to the control signal and transmit the remote control signal.
The second switching circuit 30 is further configured to disconnect the power terminals of the second power supply 70 and the control unit 40 and disconnect the power terminals of the second power supply 70 and the signal transmitting circuit 50 according to a fourth level signal, which is opposite to the fourth level signal, to cause the second power supply 70 to stop supplying power to the control unit 40 and the signal transmitting circuit 50, thereby causing the control unit 40 and the signal transmitting circuit 50 to stop operating.
In this embodiment, the first level signal, the second level signal, and the third level signal may be high level signals or low level signals, and the fourth level signal is opposite to the second level signal. Specifically, when the second level signal is a high level signal, the fourth level signal is a low level signal; when the second level signal is a low level signal, the fourth level signal is a high level signal.
The specific operating principle of the remote control circuit 100 is as follows: when any key branch of the key circuit 10 is activated, the first terminal of the first switch circuit 20 receives a first level signal, and in some embodiments, the first level signal is a high level signal. After receiving the first level signal, the first switch circuit 20 connects the second power supply 70 with the power supply terminal of the control unit 40 and the power supply terminal of the signal transmission circuit 50, so that the second power supply 70 supplies power to the control unit 40 and the radio frequency circuit 50, and the control circuit 40 and the radio frequency circuit 50 are in a working state after being powered on. At this time, the control unit 40 outputs the second level signal to the second switch circuit 30 to make the second power supply 70 and the power terminal of the control unit 40 and the power terminal of the signal transmitting circuit 50 conduct, so that the control unit 40 continuously outputs the second level signal to the second switch circuit 30 to make the second power supply 70 and the power terminal of the control unit 40 and the power terminal of the signal transmitting circuit 50 continuously conduct, and the control unit 40 and the rf circuit 50 can be always maintained in the working state; meanwhile, when any key branch is triggered, the control unit 40 receives a third level signal from the connection input end of the key branch, the control unit 40 generates a control signal corresponding to the input end and outputs the control signal to the signal sending circuit 50, and the signal sending circuit 50 generates a remote control signal according to the control signal and sends the remote control signal out. In a preset time period, if all the key branches of the key circuit 10 are not triggered all the time, that is, the control unit 40 does not detect the third level signal in the preset time, the control unit 40 outputs the fourth level signal to the second switch circuit 30, so that the second power supply 70 is disconnected from the power supply terminals of the control unit 40 and the signal transmitting circuit 50, and at this time, the control unit 40 and the signal transmitting circuit 50 enter a low power consumption state.
Different from the prior art, the embodiment of the utility model provides a remote control circuit, which comprises a key circuit, a first switch circuit, a second switch circuit, a control unit, a signal sending circuit, a first power supply and a second power supply, wherein the control unit determines which key branch is triggered by reading the level of each key branch in the key circuit, and compared with the mode of reading the voltage division value of a series resistor, the process of determining the triggered key branch by detecting the level state of the key branch transmitted to the input end of the control unit is simple and accurate; in addition, compared with the existing remote control circuit, the remote control circuit is additionally provided with the second switch circuit, when any key branch is triggered, the control unit outputs the second level signal to enable the second power supply to be continuously conducted with the power supply end of the control unit and the power supply end of the signal sending circuit, so that the control unit and the signal sending circuit can always maintain a normal working state, when no key branch is triggered within a period of time, the control unit outputs the fourth level signal to the second switch unit to enable the second power supply to be disconnected with the power supply end of the control unit and the power supply end of the signal sending circuit, the control unit and the signal sending circuit lose power and enter a low power consumption state, and therefore the overall power consumption of the remote control circuit is effectively reduced.
In some embodiments, referring to fig. 2, the first switch circuit 20 includes: a first switch tube Q1 and a second switch tube Q2.
A first end of the first switch tube Q1 is connected to the second end of each key branch 11, a first end of the first switch tube Q2 is a control end, a second end of the first switch tube Q1 is connected to the first ends of the first power supply 60 and the second switch tube Q2, respectively, a first end of the second switch tube Q2 is a control end, and a third end of the first switch tube Q1 is grounded; the second terminal of the second switch tube Q2 is connected to the power supply terminal of the control unit 40 and the power supply terminal of the signaling circuit 50, and the third terminal of the second switch tube Q2 is connected to the second power supply 70.
In some embodiments, the first switch Q1 is an NPN transistor, and the second switch Q2 is a PNP transistor. A first end of the first switch tube Q1 corresponds to a base electrode of the NPN tube, a second end of the first switch tube Q1 corresponds to a collector electrode of the NPN tube, and a third end of the first switch tube Q1 corresponds to an emitter electrode of the NPN tube; the first end of the second switch tube Q2 corresponds to the base electrode of the PNP tube, the second end of the second switch tube Q2 corresponds to the collector electrode of the PNP tube, and the third end of the second switch tube Q2 corresponds to the emitter electrode of the PNP tube.
When any key branch 11 in the key circuit 10 is triggered, the base of the first switch tube Q1 becomes high level, the first switch tube Q1 is turned on, the base of the second switch tube Q2 becomes low level, the second switch tube Q2 is turned on, so that the second power supply 70 supplies power to the control unit 40 and the signal sending circuit 50; meanwhile, the input end of the control unit 40 corresponding to the triggered key branch 11 receives a high level, the control unit 40 outputs a corresponding control signal to the signal transmitting circuit 50 after detecting the high level, and the signal transmitting circuit 50 generates a remote control signal according to the control signal and transmits the remote control signal.
In some embodiments, referring again to fig. 2, the second switch circuit 30 includes: a third switching tube Q3 and a fourth switching tube Q4.
A first end of the third switching tube Q3 is connected to a second end of the fourth switching tube Q4, a second end of the third switching tube Q3 is connected to power terminals of the control unit 40 and the signal sending unit 50, a third end of the third switching tube Q3 is connected to the second power supply 70, a first end of the fourth switching tube Q4 is connected to a first output end of the control unit 40, and a third end of the fourth switching tube Q4 is grounded.
In some embodiments, the third switching transistor Q3 is a PNP transistor, and the fourth switching transistor Q4 is an NPN transistor. A first end of the third switching tube Q3 corresponds to a base electrode of the PNP tube, a second end of the third switching tube Q3 corresponds to a collector electrode of the PNP tube, a third end of the third switching tube Q3 corresponds to an emitter electrode of the PNP tube, a first end of the fourth switching tube Q4 corresponds to a base electrode of the NPN tube, a second end of the fourth switching tube Q4 corresponds to a collector electrode of the NPN tube, and a third end of the fourth switching tube Q4 corresponds to an emitter electrode of the NPN tube.
When any key branch 11 of the key circuit 10 is triggered, the first end of the first switch circuit 20 receives a first level signal, after the first switch circuit 20 receives the first level signal, the first switch circuit 20 is turned on, the second power supply 70 is turned on with the power supply terminal of the control unit 40 and the power supply terminal of the signal transmission circuit 50, so that the control unit 40 and the signal transmission circuit 50 are in an operating state, and the second switch circuit 30 continuously receives a second level signal output by the control unit 40, in this embodiment, the second level signal is a high level signal, and in some other embodiments, the second level signal may also be a low level signal. When the first terminal of the fourth switching tube Q4 in the second switching circuit 30 receives a high level signal, the fourth switching tube Q4 is turned on, and at this time, the first terminal of the third switching tube Q3 correspondingly becomes a low level, the third switching tube Q3 is turned on, the second power supply 70 supplies power to the control unit 40 and the signal transmitting circuit 50, the control unit 40 and the second switching circuit 30 substantially form a self-locking circuit, and the control unit 40 and the signal transmitting circuit 50 are still supplied power by the second power supply 70 and maintain the working state within the preset time when the key branch 11 is triggered.
Within a preset time, if the key circuit 10 still has the key branch 11 triggered, the second switch unit 30 will continuously receive the second level signal output by the control unit 40, the third switch tube Q3 and the fourth switch tube Q4 in the second switch circuit 30 are continuously turned on, and the control unit 40 and the signal sending circuit 50 are always powered on to maintain a normal working state; if all the key branches 11 of the key circuit 10 are not triggered within the preset time, the second switch circuit 30 receives the fourth level signal sent by the control unit 40, and the fourth switch tube Q4 in the second switch circuit 30 is turned off, so that the second power supply 70 is disconnected from the power supply terminals of the control unit 40 and the signal sending circuit 50, the control unit 40 and the signal sending circuit 50 are powered off, and enter a low power consumption state, and the fourth level signal is opposite to the second level signal.
In some embodiments, referring to fig. 2 again, the key branch 11 of the key circuit 10 includes a key and an isolation circuit, a first end of the key is connected to the first power source 60, a second end of the key is connected to the first end of the isolation circuit and an input end of the control unit 40, respectively, and a second end of the isolation circuit is connected to the first end of the first switch circuit. The isolation circuit is used for preventing the current at the second end of the isolation circuit from flowing back to the first end of the isolation circuit, so as to prevent the level signals transmitted from other key branches 11 to the input end of the control unit 40 from influencing the level signals at the second end of the key branch 11, which results in key position misjudgment. In some embodiments, the isolation circuit comprises a diode. The anode of the diode is connected to the second terminal of the key and the cathode of the diode is connected to the first terminal of the first switch circuit 20. While the key circuit 10 in fig. 2 includes three key branches 11, in other embodiments, the key circuit 10 may include any number of key branches, which is not limited herein.
In some embodiments, referring to fig. 2 again, in order to ensure that the level signal of the input terminal of the corresponding control unit is the level signal opposite to the third level signal when a certain key branch 11 is not triggered, the key branch 11 further includes a pull-down resistor, a first end of the pull-down resistor is connected to a second end of the key, and a second end of the pull-down resistor is grounded.
In some embodiments, referring to fig. 2 again, in order to enable the switching tube to operate reliably, the first switching circuit further includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, and the second switching circuit further includes a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7.
The first end of the first resistor R1 is connected to the first power source 60, the second end of the first resistor R1 is connected to the second end of the first switch Q1 and the first end of the fourth resistor R4, the first end of the second resistor R2 is connected to the first end of the third resistor R3 and the second end of the key branch 11, the second end of the second resistor R2 is connected to the first end of the first switch Q1, the second end of the third resistor R3 is grounded, and the second end of the fourth resistor R4 is connected to the first end of the second switch Q2.
A first end of the fifth resistor R5 is connected to the first output end of the control unit 40, a second end of the fifth resistor R5 is connected to the first end of the fourth switching tube Q4, a first end of the sixth resistor R6 is connected to the second end of the fourth switching tube Q4 and the first end of the seventh resistor R7, respectively, a second end of the sixth resistor R6 is connected to the first end of the third switching tube Q3, and a second end of the seventh resistor R7 is connected to the third end of the third switching tube Q3.
In some embodiments, referring again to fig. 2, fig. 2 also shows a circuit configuration of the signal transmitting circuit 50 in the remote control circuit. The signal transmitting circuit 50 includes a radio frequency chip and an antenna, in some embodiments, the antenna may be disposed outside the radio frequency chip, i.e., the antenna is exposed, and in other embodiments, the antenna may be hidden inside the radio frequency chip.
The power source terminal of the rf chip is connected to the third terminal of the first switch circuit 20 and the third terminal of the second switch circuit 30, respectively, the input terminal of the rf chip is connected to the second output terminal of the control unit 40, and the output terminal of the rf chip is connected to the antenna.
The rf chip receives a control signal from the control unit 40, generates a remote control signal based on the control signal, and transmits the remote control signal to a controlled device (not shown in the figure) via an antenna, so that the controlled device performs a function corresponding to the remote control signal.
Referring to fig. 2 again, fig. 2 is a schematic circuit diagram of a remote control circuit. The remote control circuit includes a key circuit 10, a first switch circuit 20, a second switch circuit 30, a control unit 40, a signal transmission circuit 50, a first power supply 60, and a second power supply 70.
In this embodiment, the key circuit includes three key branches 11, each key branch 11 includes a key SW, a diode D1 and a pull-down resistor R8; the first switching circuit includes: the circuit comprises a first switch tube Q1, a second switch tube Q2, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4; the second switching circuit includes: a third switching tube Q3, a fourth switching tube Q4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7; the control unit 40 is an MCU chip, and the signal transmitting circuit 50 includes a radio frequency chip RF and an Antenna, wherein the first switch tube Q1 and the fourth switch tube Q4 are NPN tubes, and the second switch tube Q2 and the third switch tube Q3 are PNP tubes.
The first end of each key SW is connected with a first power supply VCC1, the second end of each key SW is respectively connected with the anode of the diode D1 of the key branch, the first end of the pull-down resistor R8 and an input end of the MCU chip, in the embodiment, the P01 end of the MCU chip, the P02 end, the P03 end are three input ends corresponding to the key branches, the P11 end of the MCU chip is a first output end, and the DAT end of the MCU chip is a second output end.
A first end of the first resistor R1 is connected to a first power source VCC1, a second end of the first resistor R1 is connected to a collector of the first switch Q1 and a first end of the fourth resistor R4, a first end of the second resistor R2 is connected to a first end of the third resistor R3 and cathodes of the diodes D1, a second end of the second resistor R2 is connected to a base of the first switch Q1, a second end of the third resistor R3 and an emitter of the first switch Q1 are grounded, and a second end of the fourth resistor R4 is connected to a base of the second switch Q2.
The first end of a fifth resistor R5 is connected with a first output end P11 of the MCU chip, the second end of a fifth resistor R5 is connected with the base electrode of a fourth switching tube Q4, the first end of a sixth resistor R6 is respectively connected with the collector electrode of a fourth switching tube Q4 and the first end of a seventh resistor R7, the second end of the sixth resistor R6 is connected with the base electrode of a third switching tube Q3, and the second end of the seventh resistor R7 is connected with a second power supply VCC 2.
A power supply terminal VCC of the radio frequency chip is respectively connected with a collector of the second switching tube Q2 and a collector of the third switching tube Q3, an input terminal DAT of the radio frequency chip RF is connected with a second output terminal DAT of the MCU chip, and an output terminal ANT of the radio frequency chip RF is connected with the Antenna.
The operation principle of the remote control circuit 100 in this embodiment is as follows:
when all the keys SW are not pressed down, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are in an off state, and at the moment, the whole remote control circuit is in a low power consumption state.
When any one of the keys SW is pressed down, the first switch tube Q1 is conducted, the base electrode of the second switch tube Q2 is changed into low level, so that the second switch tube Q2 is conducted, the MCU chip and the radio frequency chip RF are electrified and work, the MCU chip immediately outputs high level from the P11 end after work, the fourth switch tube Q4 is conducted, the base electrode of the third switch tube Q3 is correspondingly changed into low level, the third switch tube Q3 is conducted, after the keys are loosened within a preset time, the MCU chip and the radio frequency chip RF continue to be powered through the switch tube Q3, and the MCU chip is in a self-locking state.
When the MCU chip is in a self-locking state, if the key SW of a certain key branch 11 is pressed within a preset time, the input end corresponding to the MCU chip is at a high level, otherwise, the input end is at a low level, so that the level state of the input end can be identified through the MCU chip, which key is pressed is judged, then a corresponding control signal is sent to the radio frequency chip RF, and the radio frequency chip RF generates a remote control signal based on the control signal and is sent out by the Antenna. When the key circuit 10 is not pressed within the preset time, the P11 end of the MCU chip outputs a low level, the third transistor Q3 and the fourth transistor Q4 are turned off, the MCU chip and the RF chip are disconnected from the second power source VCC2, and the remote control circuit enters a low power consumption state again.
An embodiment of the present invention further provides a remote controller, which includes the remote control circuit 100 described above, where the remote controller is used to control an electronic product, where the electronic product includes but is not limited to: televisions, air conditioners, fans, etc.
It should be noted that the description of the present invention and the accompanying drawings illustrate preferred embodiments of the present invention, but the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present invention and to provide a more thorough understanding of the present disclosure. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. A remote control circuit, comprising:
the device comprises a key circuit, a control unit, a first switch circuit, a second switch circuit, a signal sending circuit, a first power supply and a second power supply;
the key circuit comprises at least one key branch, a first end of each key branch is connected with the first power supply, a second end of each key branch is connected with a first end of the first switch circuit, and a third end of each key branch is connected with one input end of the control unit;
a second end of the first switch circuit is connected with the second power supply, a third end of the first switch circuit is respectively connected with a power supply end of the control unit and a power supply end of the signal sending circuit, and a fourth end of the first switch circuit is connected with the first power supply;
the first end of the second switch circuit is connected with the first output end of the control unit, the second end of the second switch circuit is connected with the second power supply, and the third end of the second switch circuit is respectively connected with the power supply end of the control unit and the power supply end of the signal sending circuit;
the input end of the signal sending circuit is connected with the second output end of the control unit;
the key branch circuit is used for generating a first level signal at a second end of the key branch circuit when being triggered;
the first switch circuit is used for establishing connection between the second power supply and the power end of the control unit and establishing connection between the second power supply and the power end of the signal sending circuit according to the first level signal, so that the second power supply supplies power for the control unit and the signal sending circuit through the first switch circuit, and the control unit and the signal sending circuit are in working states;
the control unit is configured to output a second level signal to the second switch circuit when the control unit is in the operating state, and the second switch circuit is configured to establish a connection between the second power supply and a power end of the control unit according to the second level signal and establish a connection between the second power supply and a power end of the signal transmitting circuit, so that the second power supply supplies power to the control unit and the signal transmitting circuit through the second switch circuit, and the control unit and the signal transmitting circuit maintain the operating state;
the key branch is also used for generating a third level signal at a third end of the key branch when being triggered;
the control unit is further configured to detect a level state of an input end of the control unit connected to each of the key branches when the control unit is in a working state, generate a control signal corresponding to the input end and output the control signal to the signal sending circuit when the third level signal is detected, and output a fourth level signal to the second switch circuit if the third level signal is not detected within a preset time;
the signal transmitting circuit is used for generating a remote control signal according to the control signal and transmitting the remote control signal;
the second switch circuit is further configured to disconnect the second power supply from the power supply terminal of the control unit and disconnect the second power supply from the power supply terminal of the signal transmission circuit according to the fourth level signal, so that the second power supply stops supplying power to the control unit and the signal transmission circuit, and the control unit and the signal transmission circuit stop operating, wherein the second level signal is opposite to the fourth level signal.
2. The remote control circuit of claim 1, wherein the first switching circuit comprises: the first switch tube and the second switch tube;
the first end of the first switch tube is connected with the second end of each key branch, the second end of the first switch tube is respectively connected with the first power supply and the first end of the second switch tube, and the third end of the first switch tube is grounded;
the second end of the second switch tube is connected with the power supply end of the control unit and the power supply end of the signal sending circuit, and the third end of the second switch tube is connected with the second power supply.
3. The remote control circuit of claim 1, wherein the second switching circuit comprises: a third switching tube and a fourth switching tube;
the first end of the third switching tube is connected with the second end of the fourth switching tube, the second end of the third switching tube is respectively connected with the power supply end of the control unit and the power supply end of the signal sending circuit, and the third end of the third switching tube is connected with the second power supply;
the first end of the fourth switch tube is connected with the first output end of the control unit, and the third end of the fourth switch tube is grounded.
4. The remote control circuit of claim 1 wherein the key branch circuit comprises a key and an isolation circuit;
the first end of the key is connected with the first power supply, the second end of the key is respectively connected with the first end of the isolation circuit and one input end of the control unit, and the second end of the isolation circuit is connected with the first end of the first switch circuit;
the isolation circuit is used for preventing the current of the second end of the isolation circuit from flowing backwards to the first end of the isolation circuit.
5. The remote control circuit of claim 4, wherein the isolation circuit comprises a diode;
the anode of the diode is connected with the second end of the key, and the cathode of the diode is connected with the first end of the first switch circuit.
6. The remote control circuit of claim 4, wherein the key leg further comprises a pull-down resistor;
the first end of the pull-down resistor is connected with the second end of the key, and the second end of the pull-down resistor is grounded.
7. The remote control circuit of claim 2, wherein the first switching circuit further comprises: the circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor;
the first end of the first resistor is connected with the first power supply, the second end of the first resistor is respectively connected with the second end of the first switch tube and the first end of the fourth resistor, the first end of the second resistor is respectively connected with the first end of the third resistor and the second end of the key branch circuit, the second end of the second resistor is connected with the first end of the first switch tube, the second end of the third resistor is grounded, and the second end of the fourth resistor is connected with the first end of the second switch tube.
8. The remote control circuit of claim 3, wherein the second switching circuit further comprises: a fifth resistor, a sixth resistor and a seventh resistor;
the first end of the fifth resistor is connected with the first output end of the control unit, the second end of the fifth resistor is connected with the first end of the fourth switching tube, the first end of the sixth resistor is respectively connected with the second end of the fourth switching tube and the first end of the seventh resistor, the second end of the sixth resistor is connected with the first end of the third switching tube, and the second end of the seventh resistor is connected with the third end of the third switching tube.
9. The remote control circuit of claim 1, wherein the signal transmission circuit comprises a radio frequency chip and an antenna;
the power supply end of the radio frequency chip is respectively connected with the third end of the first switch circuit and the third end of the second switch circuit, the input end of the radio frequency chip is connected with the second output end of the control unit, and the output end of the radio frequency chip is connected with the antenna.
10. A remote control comprising a remote control circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122212184.6U CN216161221U (en) | 2021-09-13 | 2021-09-13 | Remote control circuit and remote controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122212184.6U CN216161221U (en) | 2021-09-13 | 2021-09-13 | Remote control circuit and remote controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216161221U true CN216161221U (en) | 2022-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122212184.6U Active CN216161221U (en) | 2021-09-13 | 2021-09-13 | Remote control circuit and remote controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216161221U (en) |
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2021
- 2021-09-13 CN CN202122212184.6U patent/CN216161221U/en active Active
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