Signal integration circuit and method, and signal monitoring circuit and method

Abstract

The present invention provides a signal integration circuit, a signal monitoring circuit including the signal integration circuit, a signal integration method, and a signal monitoring method using the signal integration method. The signal integration circuit includes a first sampling circuit, a second sampling circuit, a first switch switching element, a second switch switching element, and a pulse width modulation drive signal source, and the pulse width modulation drive signal source is used to control the conduction and disconnection of the first and second switch switching elements to combine two analog signals into a composite signal. The signal monitoring circuit includes the signal integration circuit and a micro control unit for receiving the composite signal for detection. The present invention combines two analog signals into a composite signal for transmission together, saving the number of connection ports required in the transmission, which is conducive to reducing the size of the product. At the same time, the number of detection ports of the micro control unit is saved, and the cost of the micro control unit is reduced. The present invention is particularly suitable for monitoring the output voltage and current of LED products.

Description

Technical Field

[0001] The present invention relates to the technical field of analog signal combination transmission, and in particular to a signal integration circuit, a signal monitoring circuit including the signal integration circuit, a signal integration method, and a signal monitoring method using the signal integration method. Background Art

[0002] Light Emitting Diode (LED) products are becoming more and more intelligent. For many LED intelligent products, it is necessary to monitor the voltage and current of the LED in real time so as to grasp the working status of the LED in real time and make corresponding adjustments.

[0003] At present, the conventional LED voltage and current detection method is as follows: the collected LED voltage signal and current signal are transmitted to the respective connection ports on the adapter through two lines, and then transmitted from the respective connection ports to the respective detection ports on the microcontroller unit (MCU), and the MCU detects and converts them to obtain the voltage value and current value of the LED. Since the voltage and current signals are transmitted separately through two lines, the adapter and the MCU need to be equipped with two connection ports and two detection ports respectively, which increases the size of the product and the cost of the MCU to a certain extent, and cannot meet the requirements of product miniaturization and cost reduction. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a signal integration circuit, a signal monitoring circuit, a signal integration method and a signal monitoring method that overcome the above problems or at least partially solve the above problems.

[0005] According to one aspect of an embodiment of the present invention, there is provided a signal integration circuit, comprising:

[0006] A first sampling circuit, used for sampling a first analog signal and outputting a first sampling signal having a first voltage within a first preset voltage range;

[0007] a second sampling circuit, configured to sample a second analog signal and output a second sampling signal having a second voltage within a second preset voltage range, wherein the second preset voltage range does not overlap with the first preset voltage range;

[0008] A first switch switching element has an input end, an output end and a control end, and the input end of the first switch switching element is connected to the output of the first sampling circuit;

[0009] a second switch switching element, having an input terminal, an output terminal and a control terminal, wherein the input terminal of the second switch switching element is connected to the output terminal of the second sampling circuit, and the output terminal of the second switch switching element is connected to the output terminal of the first switch switching element; and

[0010] A pulse width modulation (PWM) driving signal source is respectively connected to the control end of the first switch switching element and the control end of the second switch switching element, and is used to output a PWM driving signal with a specified waveform to control the on and off of the first switch switching element and the second switch switching element; wherein, under the control of the PWM driving signal, either the first switch switching element or the second switch switching element is turned on, while the other is turned off, so that the first switch switching element and the second switch switching element output the first sampling signal and the second sampling signal in a time-sharing manner, so as to combine the first sampling signal and the second sampling signal into a composite signal with a rectangular waveform corresponding to the specified waveform.

[0011] Optionally, the first analog signal is a voltage signal, and the second analog signal is a current signal.

[0012] Optionally, the first switch switching element and the second switch switching element are metal oxide semiconductor field effect transistors MOSFET or silicon controlled rectifiers SCR.

[0013] Optionally, one of the first switch switching element and the second switch switching element is an N-type metal oxide semiconductor field effect transistor NMOSFET, and the other is a P-type metal oxide semiconductor field effect transistor PMOSFET.

[0014] Optionally, the first preset voltage range is 3-5V, and the second preset voltage range is 0-2V.

[0015] According to another aspect of an embodiment of the present invention, a signal monitoring circuit is provided for monitoring a first analog signal and a second analog signal of a load circuit. The signal monitoring circuit includes:

[0016] The signal integration circuit as described above, connected to the load circuit, is used to sample the first analog signal and the second analog signal of the load circuit and output a composite signal; and

[0017] A microcontrol unit is connected to the output of the signal integration circuit, and is used to receive the composite signal, read the upper voltage amplitude and the lower voltage amplitude of the waveform of the composite signal respectively, determine that each of the upper voltage amplitude and the lower voltage amplitude is the value of the first sampling signal or the value of the second sampling signal, and restore the value of the first analog signal and the value of the second analog signal according to a specified rule.

[0018] Optionally, the micro control unit is further used for:

[0019] comparing each of the upper voltage amplitude and the lower voltage amplitude with the first preset voltage range and the second preset voltage range, respectively;

[0020] If one of the upper voltage amplitude and the lower voltage amplitude is within the first preset voltage range and the other is within the second preset voltage range, it is determined that the voltage amplitude within the first preset voltage range is the value of the first sampling signal, and the voltage amplitude within the second preset voltage range is determined to be the value of the second sampling signal.

[0021] Optionally, the load circuit is a light emitting diode (LED) circuit, the first analog signal is a voltage signal, and the second analog signal is a current signal.

[0022] Optionally, the LED circuit includes a driving circuit, which is connected to the micro control unit and is used to provide driving power for the LED in the LED circuit under the control of the micro control unit;

[0023] Wherein, the PWM driving signal source is generated by the driving circuit.

[0024] Optionally, the micro control unit is further used for:

[0025] The LED circuit is controlled according to the value of the voltage signal and the value of the current signal.

[0026] Optionally, the LED circuit is set with a voltage signal working interval and a current signal working interval;

[0027] The micro control unit is also used for:

[0028] If the value of the voltage signal is outside the voltage signal working range, adjusting the output voltage of the driving circuit of the LED circuit until the value of the voltage signal is within the voltage signal working range;

[0029] If the value of the current signal is outside the current signal working range, the output current of the driving circuit of the LED circuit is adjusted until the value of the current signal is within the current signal working range.

[0030] According to another aspect of the embodiment of the present invention, a signal integration method is provided, including:

[0031] Converting the first analog signal into a first sampling signal having a first voltage within a first preset voltage range by sampling;

[0032] Converting the second analog signal into a second sampling signal having a second voltage within a second preset voltage range by sampling, wherein the second preset voltage range does not overlap with the first preset voltage range;

[0033] With the first sampling signal and the second sampling signal as input, under the control of a pulse width modulation (PWM) driving signal having a specified waveform, the first sampling signal and the second sampling signal are respectively output in a first level interval and a second level interval in each cycle of the PWM driving signal, so as to combine the first sampling signal and the second sampling signal into a composite signal having a rectangular waveform corresponding to the specified waveform.

[0034] Optionally, the first analog signal is a voltage signal, and the second analog signal is a current signal.

[0035] Optionally, the output of the first sampling signal is controlled by a first switch switching element, and the output of the second sampling signal is controlled by a second switch switching element; wherein the PWM drive signal controls the on and off of the first switch switching element and the second switch switching element, so that in a first level interval in each cycle of the PWM drive signal, the first switch switching element is turned on and the second switch switching element is turned off, and in a second level interval in each cycle of the PWM drive signal, the first switch switching element is turned off and the second switch switching element is turned on.

[0036] Optionally, the first switch switching element and the second switch switching element are metal oxide semiconductor field effect transistors MOSFET or silicon controlled rectifiers SCR.

[0037] Optionally, one of the first switch switching element and the second switch switching element is an N-type metal oxide semiconductor field effect transistor NMOSFET, and the other is a P-type metal oxide semiconductor field effect transistor PMOSFET.

[0038] Optionally, the first preset voltage range is 3-5V, and the second preset voltage range is 0-2V.

[0039] According to another aspect of an embodiment of the present invention, a signal monitoring method is provided, which is used to monitor a first analog signal and a second analog signal of a load circuit, comprising:

[0040] By using any one of the signal integration methods described above, the first analog signal and the second analog signal are converted into a first sampling signal and a second sampling signal respectively, and the first sampling signal and the second sampling signal are integrated into a composite signal; and

[0041] Receive the composite signal, read the upper voltage amplitude and the lower voltage amplitude of the waveform of the composite signal respectively, determine that each of the upper voltage amplitude and the lower voltage amplitude is the value of the first sampling signal or the value of the second sampling signal, and restore the value of the first analog signal and the value of the second analog signal according to a specified rule.

[0042] Optionally, determining that each of the upper voltage amplitude and the lower voltage amplitude is respectively a value of the first sampling signal or a value of the second sampling signal comprises:

[0043] comparing each of the upper voltage amplitude and the lower voltage amplitude with the first preset voltage range and the second preset voltage range, respectively;

[0044] If one of the upper voltage amplitude and the lower voltage amplitude is within the first preset voltage range and the other is within the second preset voltage range, it is determined that the voltage amplitude within the first preset voltage range is the value of the first sampling signal, and the voltage amplitude within the second preset voltage range is determined to be the value of the second sampling signal.

[0045] Optionally, the load circuit is a light emitting diode (LED) circuit, the first analog signal is a voltage signal, and the second analog signal is a current signal.

[0046] Optionally, the LED circuit includes a driving circuit; and the PWM driving signal is generated by the driving circuit of the LED circuit.

[0047] Optionally, the signal monitoring method further includes:

[0048] The LED circuit is controlled according to the value of the voltage signal and the value of the current signal.

[0049] Optionally, the LED circuit is set with a voltage signal working interval and a current signal working interval;

[0050] Controlling the LED circuit according to the value of the voltage signal and the value of the current signal includes:

[0051] If the value of the voltage signal is outside the voltage signal working range, adjusting the output voltage of the driving circuit of the LED circuit until the value of the voltage signal is within the voltage signal working range;

[0052] If the value of the current signal is outside the current signal working range, the output current of the driving circuit of the LED circuit is adjusted until the value of the current signal is within the current signal working range.

[0053] The technical solution proposed in the embodiment of the present invention is as follows: first, the first and second analog signals are sampled respectively by the first and second sampling circuits, and the first and second sampling signals having voltage values ​​within different preset voltage ranges are output; then, the first and second sampling signals are input into the first and second switch switching elements respectively, and the PWM driving signal is used to control the conduction and shutdown of the first and second switch switching elements, so that the first switch switching element and the second switch switching element output the first sampling signal and the second sampling signal in a time-sharing manner, so as to combine the first sampling signal and the second sampling signal into a composite signal having a rectangular waveform, and output the composite signal to subsequent elements, thereby realizing the combination of the two analog signals into a composite signal for transmission through one line, effectively saving the number of connection ports required in the transmission, and facilitating reducing the product size.

[0054] Furthermore, after receiving the composite signal through the microcontroller unit MCU, the upper voltage amplitude and the lower voltage amplitude of the composite signal waveform are read respectively, and the values ​​of the first and second analog signals are obtained through judgment and rule restoration conversion, thereby realizing the monitoring of the first and second analog signals. Since the sampling signals corresponding to the first and second analog signals are combined into a composite signal for transmission, the MCU only needs to use one detection port to complete the detection and monitoring of the first and second analog signals, which effectively saves the number of detection ports of the MCU, thereby reducing the cost of the MCU. The technical solution of the embodiment of the present invention is particularly suitable for occasions where the output voltage and current of LED products are monitored.

[0055] Furthermore, when applied to an LED circuit, the driving circuit that provides driving power to the LED can also generate a PWM driving signal for driving the first and second switching elements, without the need to add a circuit for generating a PWM driving signal, further reducing costs.

[0056] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below.

[0057] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0059] Figure 1 It is a schematic diagram of signal transmission in LED voltage and current detection in the prior art;

[0060] Figure 2 A schematic diagram showing the structure of a signal integration circuit according to an embodiment of the present invention is shown;

[0061] Figure 3 A schematic diagram showing the connection relationship of a signal integration circuit according to a specific embodiment of the present invention is shown, wherein the first sampling signal and the second sampling signal are respectively a voltage sampling signal and a current sampling signal, and the first switch switching element and the second switch switching element are respectively an NMOSFET and a PMOSFET;

[0062] Figure 4a and Figure 4b They are shown respectively Figure 3 The waveform curves of the voltage sampling signal and the current sampling signal of the signal integration circuit shown;

[0063] Figure 5 Shows Figure 3 The waveform curve of the composite signal obtained by the signal integration circuit shown;

[0064] Figure 6 A schematic diagram of the structure of a signal monitoring circuit according to an embodiment of the present invention is shown;

[0065] Figure 7 A schematic diagram of signal transmission in two analog signal detections according to an embodiment of the present invention;

[0066] Figure 8 A schematic structural diagram of a signal monitoring circuit according to another embodiment of the present invention is shown;

[0067] Fig. 9 A flow chart showing a signal integration method according to an embodiment of the present invention; and

[0068] Fig.10 A flow chart of a signal monitoring method according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0069] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0070] In the prior art, conventional LED voltage and current detection methods are to transmit voltage signals and current signals separately through two lines. The specific transmission and detection structures used can be as follows: Figure 1 See Figure 1 It can be seen that the collected LED voltage signal and current signal are transmitted to the connection ports 1 and 2 on the adapter through two lines, and then transmitted to the detection ports I / O-1 and I / O-2 on the MCU through two lines, and then the MCU detects and converts them to obtain the voltage and current values ​​of the LED. Since the voltage signal and current signal are transmitted separately through two lines, the adapter and MCU need to be equipped with two connection ports and two detection ports respectively, which increases the size of the product and the cost of the MCU to a certain extent.

[0071] In order to solve the above technical problem, an embodiment of the present invention provides a signal integration circuit. Figure 2 FIG. 2 shows a schematic diagram of the structure of a signal integration circuit according to an embodiment of the present invention. Figure 2 As shown, the signal integration circuit 100 may at least include a first sampling circuit 110 , a second sampling circuit 120 , a first switch switching element 130 , a second switch switching element 140 and a pulse width modulation (PWM) driving signal source 150 .

[0072] The functions of the components or devices of the signal integration circuit 100 according to the embodiment of the present invention and the connection relationship between the components are now introduced:

[0073] The first sampling circuit 110 is used to sample the first analog signal and output a first sampling signal having a first voltage within a first preset voltage range.

[0074] The second sampling circuit 120 is used for sampling the second analog signal and outputting a second sampling signal having a second voltage within a second preset voltage range, wherein the second preset voltage range does not overlap with the first preset voltage range.

[0075] The first switch element 130 has an input terminal 131 , an output terminal 132 and a control terminal 133 , and the input terminal 131 of the first switch element 130 is connected to the output of the first sampling circuit 110 .

[0076] The second switch switching element 140 has an input terminal 141, an output terminal 142 and a control terminal 143, and the input terminal 141 of the second switch switching element 140 is connected to the output of the second sampling circuit 120, and the output terminal 142 of the second switch switching element 140 is connected to the output terminal 132 of the first switch switching element 130.

[0077] The PWM driving signal source 150 is respectively connected to the control end 133 of the first switch switching element 130 and the control end 143 of the second switch switching element 140, and is used to output a PWM driving signal with a specified waveform, so that the PWM driving signal controls the conduction and shutoff of the first switch switching element 130 and the second switch switching element 140; wherein, under the control of the PWM driving signal, either one of the first switch switching element 130 and the second switch switching element 140 is turned on, and the other is turned off, so that the first switch switching element 130 and the second switch switching element 140 output the first sampling signal and the second sampling signal in a time-sharing manner, so as to combine the first sampling signal and the second sampling signal into a composite signal having a rectangular waveform corresponding to the specified waveform.

[0078] The signal integration circuit proposed in the embodiment of the present invention first samples the first and second analog signals respectively through the first and second sampling circuits, and outputs the first and second sampling signals having voltage values ​​within different preset voltage ranges; then, the first and second sampling signals are respectively input into the first and second switch switching elements, and the PWM driving signal is used to control the conduction and shutdown of the first and second switch switching elements, so that the first switch switching element and the second switch switching element output the first sampling signal and the second sampling signal in a time-sharing manner, so as to combine the first sampling signal and the second sampling signal into a composite signal with a rectangular waveform, and output the composite signal to subsequent elements, thereby realizing the combination of the two analog signals into a composite signal for transmission through one line, effectively saving the number of connection ports required in the transmission, and facilitating the reduction of the product size.

[0079] In an optional embodiment of the present invention, the first analog signal and the second analog signal may be a voltage signal and a current signal respectively, so as to realize the combination of the voltage and current analog signals into one signal for transmission.

[0080] Accordingly, a common voltage sampling circuit and a current sampling circuit can be used to sample the voltage signal and the current signal respectively. For example, two resistors connected in series can be used to form a voltage sampling circuit, and the current sampling circuit can be a current sampling resistor. The composition and connection technology of the sampling circuit for sampling analog signals are well known to those skilled in the art and will not be described in detail here.

[0081] The first switch switching element and the second switch switching element mentioned above are a type of electronic element that can be switched between the on and off states according to the polarity or magnitude of the trigger voltage acting thereon, and have a small impedance, thereby reducing the loss of signal energy. The specified waveform of the PWM drive signal is a rectangular pulse waveform with a variable duty cycle. Under the control of the PWM drive signal, if either of the first switch switching element and the second switch switching element is turned on, the other is turned off. For example, when the PWM drive signal is at a high level, the first switch switching element is turned on, and the second switch switching element is turned off; when the PWM drive signal is at a low level, the first switch switching element is turned off, and the second switch switching element is turned on. Alternatively, when the PWM drive signal is at a low level, the first switch switching element is turned on, and the second switch switching element is turned off; when the PWM drive signal is at a high level, the first switch switching element is turned off, and the second switch switching element is turned on. In practical applications, the on and off conditions of the first switch switching element and the second switch switching element can be set according to the characteristics of the elements and actual needs.

[0082] In an optional embodiment of the present invention, the first switch switching element and the second switch switching element may be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or a Silicon Controlled Rectifier (SCR).

[0083] Metal oxide semiconductor field effect transistor is a kind of field effect transistor that can be widely used in analog circuits and digital circuits. According to the different polarities of its channel, it can be divided into N-channel type with electrons in the majority and P-channel type with holes in the majority. They are usually called N-type metal oxide semiconductor field effect transistor (n-Channel Metal-Oxide-Semiconductor Field-Effect Transistor, NMOSFET) and P-type metal oxide semiconductor field effect transistor (p-Channel Metal-Oxide-Semiconductor Field-Effect Transistor, PMOSFET). When a large enough potential difference is applied between the gate and source of the metal oxide semiconductor field effect transistor, the electric field will form an induced charge on the semiconductor surface under the oxide layer, and then an inversion channel will be formed. The polarity of the channel is the same as its drain and source. Assuming that the drain and source are n-type, the channel will also be n-type. After the channel is formed, the metal oxide semiconductor field effect transistor can be turned on. The channel resistance of the metal oxide semiconductor field effect transistor is low when it is turned on, and the resistance when it is turned off is almost infinite, so it is suitable as a switch for analog signals. When the first switch switching element and the second switch switching element use MOSFET, the gate of each MOSFET serves as the control terminal, and the source and drain serve as one of the input terminal and the other of the output terminal according to actual needs.

[0084] The silicon controlled rectifier, also known as the thyristor, is composed of four layers of semiconductor materials, has three PN junctions, and has three electrodes facing the outside, namely the anode, the control electrode, and the cathode. It is a unidirectional conductive device with only two states: on and off. The silicon controlled rectifier is turned on by applying a forward voltage between the anode and cathode of the silicon controlled rectifier and inputting a forward trigger voltage between the control electrode and the cathode. When a pulsating DC voltage is applied between the anode and cathode of the silicon controlled rectifier, the silicon controlled rectifier will automatically shut down when the voltage passes through zero. The on and off properties of the silicon controlled rectifier can be used as a switch for analog signals. When the first switch switching element and the second switch switching element use a silicon controlled rectifier, the control electrode of each silicon controlled rectifier serves as the control terminal, and the cathode and anode serve as one of the input terminal and the other of the output terminal according to actual needs.

[0085] In a preferred embodiment, one of the first switch element and the second switch element is an NMOSFET, and the other is a PMOSFET.

[0086] Figure 3FIG. 1 is a schematic diagram showing the connection relationship of a signal integration circuit according to a specific embodiment of the present invention, wherein the first sampling signal and the second sampling signal can be a voltage sampling signal and a current sampling signal respectively, and the first switch switching element and the second switch switching element are NMOSFET and PMOSFET respectively. Figure 3 As shown, the drain of the NMOSFET as the first switch switching element is connected to the voltage sampling signal as the input terminal, the source is connected to the output terminal, and the gate is connected to the PWM drive signal as the control terminal. The source of the PMOSFET as the second switch switching element is connected to the current sampling signal as the input terminal, the gate is connected to the PWM drive signal as the control terminal, and the drain is connected to the output terminal of the NMOSFET as the output terminal. After the output terminal of the NMOSFET is connected to the output terminal of the PMOSFET, the whole serves as the output terminal of the signal integration circuit. It should be noted that in order to simplify the description, Figure 3 The first sampling circuit and the second sampling circuit are not shown in the figure, and those skilled in the art can understand that the voltage sampling signal and the current sampling signal can be output by the first sampling circuit and the second sampling circuit respectively.

[0087] The voltage sampling signal and current sampling signal mentioned above are obtained by sampling the voltage signal and the current signal respectively, and their waveform curves are as follows: Figure 4a and Figure 4b As shown in . Figure 4a and Figure 4b , Figure 4a A waveform curve of the voltage sampling signal is shown, wherein the X-axis represents time (t) and the Y-axis represents the voltage value (v) of the voltage sampling signal. It can be seen that the voltage sampling signal has a constant first voltage value within a first preset voltage range. Figure 4b The waveform curve of the current sampling signal is shown, wherein the X-axis represents time (t) and the Y-axis represents the voltage value (v) of the current sampling signal. It can be seen that the current sampling signal has a constant second voltage value within a second preset voltage range. The second preset voltage range does not overlap with the first preset voltage range. In an optional embodiment, in order to improve the resolution of the first sampling signal and the second sampling signal by subsequent components, the first preset voltage range can be set to 3-5V, and the second preset voltage range can be set to 0-2V.

[0088] The PWM drive signal controls the on and off of NMOSFET and PMOSFET. When the PWM drive signal is at a high level, NMOSFET is turned on and PMOSFET is turned off. At this time, the voltage sampling signal can pass through NMOSFET but the current sampling signal cannot pass through PMOSFET. When the PWM drive signal is at a low level, NMOSFET is turned off and PMOSFET is turned on. At this time, the voltage sampling signal cannot pass through NMOSFET but the current sampling signal can pass through PMOSFET. Through this driving method, the time-sharing output of the voltage sampling signal and the current sampling signal is realized, so that the voltage sampling signal and the current sampling signal are combined into a composite signal, and the composite signal is output from the connection point between the output end of NMOSFET and the output end of PMOSFET. The waveform curve of the resulting composite signal is shown in FIG. Figure 5 As shown, where the X-axis represents time (t) and the Y-axis represents the voltage value (v) of the composite signal, it can be seen that the composite signal has a rectangular waveform, and the upper voltage amplitude and the lower voltage amplitude of the waveform correspond to the voltage value of the input voltage sampling signal and the voltage value of the current sampling signal, respectively. It should be noted that the present invention does not limit the duty cycle of the PWM drive signal. Preferably, the duty cycle of the PWM drive signal can be 50%, in which case the waveform of the resulting composite signal is a square wave.

[0089] Based on the same inventive concept, an embodiment of the present invention further provides a signal monitoring circuit for monitoring a first analog signal and a second analog signal of a load circuit. Figure 6 FIG. 2 shows a schematic diagram of a signal monitoring circuit according to an embodiment of the present invention. Figure 6 As shown, the signal monitoring circuit 600 may at least include the signal integration circuit 100 mentioned above and a micro control unit MCU 610 .

[0090] The signal integration circuit 100 is connected to the load circuit and is used to sample the first analog signal and the second analog signal of the load circuit and output a composite signal.

[0091] The microcontrol unit 610 is connected to the output of the signal integration circuit 100, and is used to receive the composite signal output by the signal integration circuit, read the upper voltage amplitude and the lower voltage amplitude of the waveform of the composite signal respectively, determine whether each of the upper voltage amplitude and the lower voltage amplitude is the value of the first sampling signal or the value of the second sampling signal, and restore the value of the first analog signal and the value of the second analog signal according to the specified rule.

[0092] It should be noted that in order to simplify the structure description, Figure 6 The load circuit is not shown.

[0093] In an optional embodiment of the present invention, the micro control unit 610 may also be used for:

[0094] comparing each of the upper voltage magnitude and the lower voltage magnitude to a first preset voltage range and a second preset voltage range, respectively;

[0095] If one of the upper voltage amplitude and the lower voltage amplitude is within the first preset voltage range and the other is within the second preset voltage range, then the voltage amplitude within the first preset voltage range is determined to be the value of the first sampling signal, and the voltage amplitude within the second preset voltage range is determined to be the value of the second sampling signal.

[0096] The following is a specific example to illustrate the working process of the signal monitoring circuit 600.

[0097] First, the first sampling circuit 110 samples the voltage signal of the load circuit and outputs a voltage sampling signal having a first voltage (e.g., 4V) in the range of 3-5V. At the same time, the second sampling circuit 120 samples the current signal of the load circuit and outputs a current sampling signal having a second voltage (e.g., 1V) in the range of 0-2V.

[0098] Then, the voltage sampling signal and the current sampling signal are respectively input into the first switch switching element 130 and the second switch switching element 140, and the first switch switching element 130 and the second switch switching element 140 are driven by the PWM driving signal output by the PWM driving signal source 150, so that the voltage sampling signal and the current sampling signal are combined into a composite signal with a rectangular waveform.

[0099] Finally, the microcontroller unit 610 receives the composite signal and monitors the waveform of the composite signal. When a rectangular waveform is detected, the microcontroller unit 610 reads the upper voltage amplitude and the lower voltage amplitude of the rectangular waveform respectively, and compares them with the 3-5V voltage range and the 0-2V voltage range. If one of the read upper voltage amplitude and the read lower voltage amplitude is within the 3-5V voltage range and the other is within the 0-2V voltage range, it is determined that the voltage amplitude within the 3-5V voltage range is the value of the voltage sampling signal, and the voltage amplitude within the 0-2V voltage range is the value of the current sampling signal. Furthermore, the microcontroller unit 610 restores the values ​​of the sampled voltage signal and the current signal according to the sampling rules of the first sampling circuit 110 and the second sampling circuit 120.

[0100] In a specific restoration method, restoration can be performed by ratio conversion. For example, when the sampling rule of the first sampling circuit 110 is: by adjusting the voltage sampling resistor, the ratio of the value of the voltage sampling signal to the value of the sampled voltage signal is 1 / 50 (that is, the reduction ratio when the first sampling circuit 110 samples the voltage signal is 1 / 50); the sampling rule of the second sampling circuit 120 is: by adjusting the current sampling resistor, the ratio of the value of the current sampling signal to the value of the sampled current signal is 20 (that is, the amplification ratio when the second sampling circuit 120 samples the current signal is 20), the micro control unit 610 divides the voltage amplitude determined as the value of the voltage sampling signal by the reduction ratio of 1 / 50 when the first sampling circuit 110 samples the voltage signal, and obtains the value of the sampled voltage signal; and the micro control unit 610 divides the voltage amplitude determined as the value of the current sampling signal by the amplification ratio of 20 when the second sampling circuit 120 samples the current signal, and obtains the value of the sampled current signal.

[0101] After receiving the composite signal through the microcontroller unit MCU, the embodiment of the present invention reads the upper voltage amplitude and the lower voltage amplitude of the waveform of the composite signal respectively, and obtains the values ​​of the first and second analog signals through judgment and rule restoration conversion, thereby realizing the monitoring of the first and second analog signals. Since the sampling signals corresponding to the first and second analog signals are combined into a composite signal for transmission, the MCU only needs to use one detection port to complete the detection and monitoring of the first and second analog signals, which effectively saves the number of detection ports of the MCU, thereby reducing the cost of the MCU.

[0102] pass Figure 7 The signal transmission schematic diagram of FIG. 1 can make it easier for those skilled in the art to understand the beneficial effects of the technical solution provided by the embodiment of the present invention. Figure 7 It can be seen that after the voltage signal and the current signal are combined into a composite signal, they are transmitted to the connection port 1 on the adapter through a line, and then transmitted to the detection port I / O-1 on the MCU through a line, and then the MCU detects and restores them to obtain the voltage value and current value. Since the voltage signal and the current signal are combined into one signal for transmission, only one connection port on the adapter and one detection port on the MCU are required. Under the constraints of size and MCU cost, reducing one connection port or MCU detection port can effectively reduce costs. It should be noted that Figure 7 Although only the voltage signal and the current signal are combined, those skilled in the art will appreciate that any two analog signals can be used to replace the voltage signal and the current signal here to combine, and the above-mentioned effect can also be obtained. It should also be noted that Figure 7 The total number of ports of the adapter and the total number of ports of the MCU shown in the figure are merely illustrative and do not constitute a limitation to the present invention.

[0103] In an optional embodiment of the present invention, the load circuit may be an LED circuit, the first analog signal may be a voltage signal, and the second analog signal may be a current signal. Here, the first analog signal and the second analog signal may be a voltage signal and a current signal of an LED in the LED circuit, respectively, or a voltage signal and a current signal of a driver output in the LED circuit. Figure 8 As shown, the first sampling circuit 110 and the second sampling circuit 120 are connected to the LED circuit 620, and are used to sample the first analog signal and the second analog signal of the LED circuit 620 respectively. The micro control unit 610 can control the state of the display LED and / or control the light emission of the LED according to the value of the first analog signal and the value of the second analog signal obtained. Specifically, the signal monitoring circuit 600 can monitor the voltage signal and the current signal of the LED, wherein the micro control unit 610 can send the detected voltage value and current value of the LED to other devices for display, and can also perform feedback control on the power supply of the LED according to the detected voltage value and current value of the LED, thereby controlling the light emission of the LED.

[0104] Further, still referring to Figure 8 As shown, the LED circuit 620 may include a driving circuit 621. The driving circuit 621 is connected to the micro control unit 610, and is used to provide driving power for the LED in the LED circuit 620 under the control of the micro control unit 610. At this time, the PWM driving signal source 150 may be generated by the driving circuit 621. In practical applications, the driving circuit 621 may be a switching power supply, and then a PWM signal generated by a driving IC (Integrated Circuit) in the switching power supply for driving a switching tube (usually a MOS tube) in the switching power supply to perform energy conversion may be used as the PWM driving signal source 150.

[0105] By using the PWM signal in the LED driving main circuit generated by the switching power supply as the PWM driving signal for driving the first and second switching elements, there is no need to add a circuit for generating the PWM driving signal, thereby further reducing the cost.

[0106] In an optional embodiment of the present invention, when the load circuit is an LED circuit, the micro control unit 610 may also be used for:

[0107] The LED circuit 620 is controlled according to the value of the voltage signal and the value of the current signal of the LED circuit 620 .

[0108] Furthermore, the LED circuit 620 can also be set with a voltage signal working range and a current signal working range. At this time, the micro control unit 610 can also be used for:

[0109] If the value of the voltage signal of the LED circuit 620 is outside the voltage signal working range, the output voltage of the driving circuit 621 of the LED circuit 620 is adjusted until the value of the voltage signal is within the voltage signal working range;

[0110] If the value of the current signal of the LED circuit 620 is outside the current signal working range, the output current of the driving circuit 621 of the LED circuit 620 is adjusted until the value of the current signal is within the current signal working range.

[0111] The following describes a specific example of how the micro control unit 610 controls the LED circuit according to the detected values ​​of the voltage signal and the current signal of the LED circuit.

[0112] Assume that the preset voltage signal working range of the LED circuit 620 is 38-40V, and the current signal working range is 18-20mA. If the value of the voltage signal of the LED circuit 620 obtained by the microcontroller unit 610 through the restoration operation is 42V, which is higher than the upper limit of the voltage signal working range, the microcontroller unit 610 reduces the output voltage of the driving circuit 621 (specifically, it can be a switching power supply) of the LED circuit 620 through the feedback control signal until the value of the voltage signal of the LED circuit 620 is within 38-40V. If the value of the current signal of the LED circuit 620 obtained by the microcontroller unit 610 through the restoration operation is 16mA, which is lower than the lower limit of the current signal working range, the microcontroller unit 610 increases the output current of the driving circuit 621 (specifically, it can be a switching power supply) of the LED circuit 620 through the feedback control signal until the value of the current signal of the LED circuit 620 is within 18-20m, thereby ensuring the normal operation of the LED.

[0113] Based on the same inventive concept, an embodiment of the present invention further provides a signal integration method. Fig. 9 FIG. 4 is a flow chart showing a signal integration method according to an embodiment of the present invention. Fig. 9 , the signal integration method may at least include the following steps S902 to S906.

[0114] Step S902 : converting the first analog signal into a first sampling signal having a first voltage within a first preset voltage range through sampling.

[0115] Step S904 , converting the second analog signal into a second sampling signal having a second voltage within a second preset voltage range by sampling, wherein the second preset voltage range does not overlap with the first preset voltage range.

[0116] Step S906, taking the first sampling signal and the second sampling signal as input, under the control of a pulse width modulation (PWM) driving signal having a specified waveform, outputting the first sampling signal and the second sampling signal in the first level interval and the second level interval in each cycle of the PWM driving signal respectively, so as to combine the first sampling signal and the second sampling signal into a composite signal having a rectangular waveform corresponding to the specified waveform.

[0117] The above steps S902 and S904 may be performed simultaneously.

[0118] In an optional embodiment of the present invention, the first analog signal and the second analog signal may be a voltage signal and a current signal respectively, so as to realize the combination of the voltage and current analog signals into one signal for transmission.

[0119] Accordingly, a common voltage sampling circuit and a current sampling circuit can be used to sample the voltage signal and the current signal respectively. For example, two resistors connected in series can be used to form a voltage sampling circuit, and the current sampling circuit can be a current sampling resistor. The technology of sampling analog signals through a sampling circuit is well known to those skilled in the art and will not be described in detail here.

[0120] In an optional implementation, step S906 can control the output of the first sampling signal through the first switch switching element, and control the output of the second sampling signal through the second switch switching element. The PWM drive signal controls the on and off of the first switch switching element and the second switch switching element, so that in the first level interval of each cycle of the PWM drive signal, the first switch switching element is turned on and the second switch switching element is turned off, and in the second level interval of each cycle of the PWM drive signal, the first switch switching element is turned off and the second switch switching element is turned on.

[0121] The first switch switching element and the second switch switching element mentioned above are a type of electronic element that can be switched between the on and off states according to the polarity or magnitude of the trigger voltage acting thereon, and have a small impedance, thereby reducing the loss of signal energy. The specified waveform of the PWM drive signal is a rectangular pulse waveform with a variable duty cycle. Under the control of the PWM drive signal, if either of the first switch switching element and the second switch switching element is turned on, the other is turned off. For example, when the PWM drive signal is at a high level, the first switch switching element is turned on, and the second switch switching element is turned off; when the PWM drive signal is at a low level, the first switch switching element is turned off, and the second switch switching element is turned on. Alternatively, when the PWM drive signal is at a low level, the first switch switching element is turned on, and the second switch switching element is turned off; when the PWM drive signal is at a high level, the first switch switching element is turned off, and the second switch switching element is turned on. In practical applications, the on and off conditions of the first switch switching element and the second switch switching element can be set according to the characteristics of the elements and actual needs.

[0122] In a preferred embodiment of the present invention, the first switch switching element and the second switch switching element may be metal oxide semiconductor field effect transistors MOSFETs or silicon controlled rectifiers SCRs.

[0123] More preferably, one of the first switch switching element and the second switch switching element is an N-type metal oxide semiconductor field effect transistor NMOSFET, and the other is a P-type metal oxide semiconductor field effect transistor PMOSFET. The working principle of NMOSFET and PMOSFET under the control of the PWM drive signal is as described above.

[0124] As mentioned above, the second preset voltage range does not overlap with the first preset voltage range. In order to improve the ability to subsequently distinguish the first sampling signal and the second sampling signal from the composite signal, in an optional implementation, the first preset voltage range can be set to 3-5V, and the second preset voltage range can be set to 0-2V.

[0125] Based on the same inventive concept, an embodiment of the present invention further provides a signal monitoring method for monitoring a first analog signal and a second analog signal of a load circuit. Fig.10 FIG. 4 is a flow chart showing a signal monitoring method according to an embodiment of the present invention. Fig.10 The signal monitoring method may at least include steps S902 to S906 of the signal integration method described above, and may also include step S908.

[0126] Through steps S902 to S906 , the first analog signal and the second analog signal of the load circuit are converted into a first sampling signal and a second sampling signal respectively, and the first sampling signal and the second sampling signal are integrated into a composite signal.

[0127] In step S908, the composite signal is received, the upper voltage amplitude and the lower voltage amplitude of the waveform of the composite signal are read respectively, it is determined that each of the upper voltage amplitude and the lower voltage amplitude is the value of the first sampling signal or the value of the second sampling signal, and the value of the first analog signal and the value of the second analog signal are restored according to the specified rules.

[0128] In an optional embodiment of the present invention, determining in step S908 whether each of the upper voltage amplitude and the lower voltage amplitude is respectively a value of the first sampling signal or a value of the second sampling signal may include:

[0129] comparing each of the upper voltage magnitude and the lower voltage magnitude to a first preset voltage range and a second preset voltage range, respectively;

[0130] If one of the upper voltage amplitude and the lower voltage amplitude is within the first preset voltage range and the other is within the second preset voltage range, then the voltage amplitude within the first preset voltage range is determined to be the value of the first sampling signal, and the voltage amplitude within the second preset voltage range is determined to be the value of the second sampling signal.

[0131] In step S908 above, the values ​​of the sampled first analog signal and the sampled second analog signal are restored according to the sampling rule. In a specific restoration method, the restoration can be performed by ratio conversion, and the restoration operation is as described above.

[0132] In an optional embodiment of the present invention, the load circuit may be an LED circuit, the first analog signal may be a voltage signal, and the second analog signal may be a current signal. Here, the first analog signal and the second analog signal may be a voltage signal and a current signal of an LED in the LED circuit, respectively, or may be a voltage signal and a current signal of a driving output in the LED circuit. At this time, the voltage signal of the LED as the first analog signal and the current signal of the LED as the second analog signal may be sampled in step S902 and step S904, respectively, and after restoring the value of the voltage signal and the value of the current signal of the LED in step S908, the state of the LED may be controlled and displayed, and / or the light emission of the LED may be controlled according to the obtained value of the voltage signal and the value of the current signal of the LED.

[0133] Further, the LED circuit may include a driving circuit. In this case, the PWM driving signal is generated by the driving circuit of the LED circuit.

[0134] In practical applications, the driving circuit may be a switching power supply, and the PWM signal generated by the driver IC in the switching power supply for driving the switching tube (usually a MOS tube) in the switching power supply to perform energy conversion may be used as a PWM driving signal source, from which part of the PWM signal is extracted as the PWM driving signal.

[0135] In an optional embodiment of the present invention, the signal monitoring method may further include the following steps:

[0136] The LED circuit is controlled according to the restored values ​​of the voltage signal and the current signal of the LED circuit.

[0137] Furthermore, the LED circuit may also be set with a voltage signal working interval and a current signal working interval. At this time, the signal monitoring method may also include the following steps:

[0138] If the value of the voltage signal of the LED circuit is outside the voltage signal working range, adjusting the output voltage of the driving circuit of the LED circuit until the value of the voltage signal is within the voltage signal working range;

[0139] If the value of the current signal of the LED circuit is outside the current signal working range, the output current of the driving circuit of the LED circuit is adjusted until the value of the current signal is within the current signal working range.

[0140] It should be noted that, in practical applications, all the above optional implementation modes can be arbitrarily combined to form optional embodiments of the present invention, which will not be described one by one here.

[0141] According to any one of the above preferred embodiments or a combination of multiple preferred embodiments, the embodiments of the present invention can achieve the following beneficial effects:

[0142] The technical solution proposed in the embodiment of the present invention is as follows: first, the first and second analog signals are sampled respectively by the first and second sampling circuits, and the first and second sampling signals having voltage values ​​within different preset voltage ranges are output; then, the first and second sampling signals are input into the first and second switch switching elements respectively, and the PWM driving signal is used to control the conduction and shutdown of the first and second switch switching elements, so that the first switch switching element and the second switch switching element output the first sampling signal and the second sampling signal in a time-sharing manner, so as to combine the first sampling signal and the second sampling signal into a composite signal having a rectangular waveform, and output the composite signal to subsequent elements, thereby realizing the combination of the two analog signals into a composite signal for transmission through one line, effectively saving the number of connection ports required in the transmission, and facilitating reducing the product size.

[0143] Furthermore, after receiving the composite signal through the microcontroller unit MCU, the upper voltage amplitude and the lower voltage amplitude of the composite signal waveform are read respectively, and the values ​​of the first and second analog signals are obtained through judgment and rule restoration conversion, thereby realizing the monitoring of the first and second analog signals. Since the sampling signals corresponding to the first and second analog signals are combined into a composite signal for transmission, the MCU only needs to use one detection port to complete the detection and monitoring of the first and second analog signals, which effectively saves the number of detection ports of the MCU, thereby reducing the cost of the MCU. The technical solution of the embodiment of the present invention is particularly suitable for occasions where the output voltage and current of LED products are monitored.

[0144] Furthermore, when applied to an LED circuit, the driving circuit that provides driving power to the LED can also generate a PWM driving signal for driving the first and second switching elements, without the need to add a circuit for generating a PWM driving signal, further reducing costs.

[0145] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that within the spirit and principles of the present invention, the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate from the protection scope of the present invention.

Claims

1. A signal integration circuit, characterized in that: include: A first sampling circuit, used for sampling a first analog signal and outputting a first sampling signal having a first voltage within a first preset voltage range; a second sampling circuit, configured to sample a second analog signal and output a second sampling signal having a second voltage within a second preset voltage range, wherein the second preset voltage range does not overlap with the first preset voltage range; A first switch switching element has an input end, an output end and a control end, and the input end of the first switch switching element is connected to the output of the first sampling circuit; A second switch switching element, having an input end, an output end and a control end, wherein the input end of the second switch switching element is connected to the output end of the second sampling circuit, and the output end of the second switch switching element is connected to the output end of the first switch switching element; as well as A pulse width modulation (PWM) driving signal source is connected to the control end of the first switch switching element and the control end of the second switch switching element, respectively, and is used to output a PWM driving signal with a specified waveform to control the on and off of the first switch switching element and the second switch switching element; wherein, under the control of the PWM driving signal, either the first switch switching element or the second switch switching element is turned on, while the other is turned off, so that the first switch switching element and the second switch switching element output the first sampling signal and the second sampling signal in a time-sharing manner, so as to combine the first sampling signal and the second sampling signal into a composite signal with a rectangular waveform corresponding to the specified waveform; wherein The first analog signal is a voltage signal, and the second analog signal is a current signal; The first switch switching element and the second switch switching element are electronic components that switch between on and off states according to the polarity or magnitude of a trigger voltage applied thereto; and The specified waveform of the PWM driving signal is a rectangular pulse waveform with a variable duty cycle.

2. The signal integration circuit according to claim 1, characterized in that: The first switch switching element and the second switch switching element are metal oxide semiconductor field effect transistors MOSFET or silicon controlled rectifiers SCR.

3. The signal integration circuit according to claim 2, characterized in that: One of the first switch switching element and the second switch switching element is an N-type metal oxide semiconductor field effect transistor (NMOSFET), and the other is a P-type metal oxide semiconductor field effect transistor (PMOSFET).

4. The signal integration circuit according to claim 1, characterized in that: The first preset voltage range is 3-5V, and the second preset voltage range is 0-2V.

5. A signal monitoring circuit, for monitoring a first analog signal and a second analog signal of a load circuit, characterized in that: The signal monitoring circuit comprises: The signal integration circuit according to any one of claims 1 to 4, connected to the load circuit, and configured to sample the first analog signal and the second analog signal of the load circuit and output a composite signal; and A microcontroller unit is connected to the output of the signal integration circuit, and is used to receive the composite signal, read the upper voltage amplitude and the lower voltage amplitude of the waveform of the composite signal respectively, determine that each of the upper voltage amplitude and the lower voltage amplitude is the value of the first sampling signal or the value of the second sampling signal respectively, and restore the value of the first analog signal and the value of the second analog signal according to a specified rule.

6. The signal monitoring circuit according to claim 5, characterized in that: The micro control unit is also used for: comparing each of the upper voltage amplitude and the lower voltage amplitude with the first preset voltage range and the second preset voltage range, respectively; If one of the upper voltage amplitude and the lower voltage amplitude is within the first preset voltage range and the other is within the second preset voltage range, it is determined that the voltage amplitude within the first preset voltage range is the value of the first sampling signal, and the voltage amplitude within the second preset voltage range is determined to be the value of the second sampling signal.

7. The signal monitoring circuit according to claim 5 or 6, characterized in that: The load circuit is a light emitting diode (LED) circuit, the first analog signal is a voltage signal, and the second analog signal is a current signal.

8. The signal monitoring circuit according to claim 7, characterized in that: The LED circuit comprises a driving circuit, which is connected to the micro control unit and is used to provide driving power to the LED in the LED circuit under the control of the micro control unit; Wherein, the PWM driving signal source is generated by the driving circuit.

9. The signal monitoring circuit according to claim 8, characterized in that: The micro control unit is also used for: The LED circuit is controlled according to the value of the voltage signal and the value of the current signal.

10. The signal monitoring circuit according to claim 9, characterized in that: The LED circuit is set with a voltage signal working range and a current signal working range; The micro control unit is also used for: If the value of the voltage signal is outside the voltage signal working range, adjusting the output voltage of the driving circuit of the LED circuit until the value of the voltage signal is within the voltage signal working range; If the value of the current signal is outside the current signal working range, the output current of the driving circuit of the LED circuit is adjusted until the value of the current signal is within the current signal working range.

11. A signal integration method, characterized in that: include: Converting the first analog signal into a first sampling signal having a first voltage within a first preset voltage range by sampling; Converting the second analog signal into a second sampling signal having a second voltage within a second preset voltage range by sampling, wherein the second preset voltage range does not overlap with the first preset voltage range; Taking the first sampling signal and the second sampling signal as input, under the control of a pulse width modulation (PWM) driving signal having a specified waveform, the first sampling signal and the second sampling signal are respectively output in a first level interval and a second level interval in each cycle of the PWM driving signal, so as to combine the first sampling signal and the second sampling signal into a composite signal having a rectangular waveform corresponding to the specified waveform; wherein The first analog signal is a voltage signal, and the second analog signal is a current signal; Control the output of the first sampling signal through a first switch switching element, and control the output of the second sampling signal through a second switch switching element; The first switch switching element and the second switch switching element are electronic components that switch between on and off states according to the polarity or magnitude of a trigger voltage applied thereto; and The specified waveform of the PWM driving signal is a rectangular pulse waveform with a variable duty cycle.

12. The signal integration method according to claim 11, characterized in that: The PWM drive signal controls the on and off of the first switch switching element and the second switch switching element, so that in a first level interval in each cycle of the PWM drive signal, the first switch switching element is turned on and the second switch switching element is turned off, and in a second level interval in each cycle of the PWM drive signal, the first switch switching element is turned off and the second switch switching element is turned on.

13. The signal integration method according to claim 12, characterized in that: The first switch switching element and the second switch switching element are metal oxide semiconductor field effect transistors MOSFET or silicon controlled rectifiers SCR.

14. The signal integration method according to claim 13, characterized in that: One of the first switch switching element and the second switch switching element is an N-type metal oxide semiconductor field effect transistor (NMOSFET), and the other is a P-type metal oxide semiconductor field effect transistor (PMOSFET).

15. The signal integration method according to claim 11, characterized in that: The first preset voltage range is 3-5V, and the second preset voltage range is 0-2V.

16. A signal monitoring method for monitoring a first analog signal and a second analog signal of a load circuit, characterized in that: include: By using the signal integration method according to any one of claims 11 to 15, the first analog signal and the second analog signal are converted into a first sampling signal and a second sampling signal respectively, and the first sampling signal and the second sampling signal are integrated into a composite signal; as well as Receive the composite signal, read the upper voltage amplitude and the lower voltage amplitude of the waveform of the composite signal respectively, determine that each of the upper voltage amplitude and the lower voltage amplitude is the value of the first sampling signal or the value of the second sampling signal, and restore the value of the first analog signal and the value of the second analog signal according to a specified rule.

17. The signal monitoring method according to claim 16, characterized in that: Determining whether each of the upper voltage amplitude and the lower voltage amplitude is respectively a value of the first sampling signal or a value of the second sampling signal comprises: comparing each of the upper voltage amplitude and the lower voltage amplitude with the first preset voltage range and the second preset voltage range, respectively; If one of the upper voltage amplitude and the lower voltage amplitude is within the first preset voltage range and the other is within the second preset voltage range, it is determined that the voltage amplitude within the first preset voltage range is the value of the first sampling signal, and the voltage amplitude within the second preset voltage range is determined to be the value of the second sampling signal.

18. The signal monitoring method according to claim 16 or 17, characterized in that: The load circuit is a light emitting diode (LED) circuit, the first analog signal is a voltage signal, and the second analog signal is a current signal.

19. The signal monitoring method according to claim 18, characterized in that: The LED circuit includes a driving circuit; the PWM driving signal is generated by the driving circuit of the LED circuit.

20. The signal monitoring method according to claim 19, characterized in that: Also includes: The LED circuit is controlled according to the value of the voltage signal and the value of the current signal.

21. The signal monitoring method according to claim 20, wherein: The LED circuit is set with a voltage signal working range and a current signal working range; Controlling the LED circuit according to the value of the voltage signal and the value of the current signal includes: If the value of the voltage signal is outside the voltage signal working range, adjusting the output voltage of the driving circuit of the LED circuit until the value of the voltage signal is within the voltage signal working range; If the value of the current signal is outside the current signal working range, the output current of the driving circuit of the LED circuit is adjusted until the value of the current signal is within the current signal working range.

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