Electrical control setting device, load drive device and its wide-range reference voltage generation device

Abstract

This invention discloses an electronic control setting device, a load driving device, and a wide-range reference voltage generating device. The wide-range reference voltage generating device includes a digital selection circuit and a wide-range voltage generating circuit. The digital selection circuit is coupled to a first high-voltage terminal and a first low-voltage terminal. The digital selection circuit selects one of a plurality of different digital signals as a control digital signal output. The wide-range voltage generating circuit is coupled to the digital selection circuit, a second high-voltage terminal, and a second low-voltage terminal. The wide-range voltage generating circuit receives the control digital signal and generates a separate reference voltage accordingly using a voltage divider method.

Description

Technical Field

[0001] This invention relates to a wide-range voltage generation technology, and particularly to an electronic control setting device, a load driving device, and a wide-range reference voltage generation device thereof. Background Technology

[0002] To reduce the number of models, manufacturers typically provide specific settings for power supplies for indoor light-emitting diodes (LEDs), enabling a single power supply to accommodate various current ratings for different lighting fixtures. In other words, the same LED power supply offers multiple current ratings to choose from.

[0003] In switching power supplies, a common method for implementing multiple current range settings is as follows: A current sensing circuit located on the output side of the power circuit samples the current to obtain the output current value. This value is then compared with a set reference value, and combined with a feedback control circuit, the output current is regulated. In this process, the resistance value of the current sampling resistor (thus changing the detected current value) or the reference voltage can be changed to achieve multiple output current range settings. Using a built-in DIP switch to achieve multiple current range selection is a common approach. Comparing existing products on the market, some use 3-bit or 4-bit DIP switches to achieve 8 current range settings.

[0004] Figure 1 This is a circuit diagram of a prior art LED driving device. Please refer to [link / reference]. Figure 1 The LED driver switches three switches 10 (implemented by a 3-bit DIP switch) and resistors 12 and 14 to provide various current sampling values ​​CS to the power drive circuit 16, thereby generating different current levels for the LED 18. Because resistor 12 is connected in parallel, the combined resistance cannot achieve a wide range of linear proportional relationships. LED power supplies from other manufacturers using this method to change the current level can only achieve a narrow range of changes, for example, 850–1200 milliamperes (mA), with a range span of only 350 mA.

[0005] Figure 2 This is a circuit diagram of another LED driver device in the prior art. Please refer to [link / reference]. Figure 2 Three switches 20, implemented by 3-bit DIP switches, are connected to the pins of the microcontroller 22. The microcontroller 22 obtains different DIP states through its program and outputs different voltage signals to the power drive circuit 24 accordingly, using these voltage signals as the reference voltage for the current range. However, the biggest drawback of this method is that it requires a microcontroller 22; LED power supplies without a built-in microcontroller cannot be used.

[0006] Figure 3 This is a circuit diagram of another existing LED driver device. Please refer to [link / reference]. Figure 3 The selection method between the three switches 26 implemented by the 3-bit DIP switch and the multiple parallel resistors 28 enables the setting of different reference voltages. However, the resistance value of the combined resistors cannot achieve a large range of linear proportional relationships, and can only achieve a narrow range of changes.

[0007] Therefore, the present invention addresses the aforementioned problems by providing an electronic control setting device, a load driving device, and a wide-range reference voltage generating device to solve the problems arising from the prior art. Summary of the Invention

[0008] The purpose of this invention is to provide an electronic control setting device, a load driving device, and a wide-range reference voltage generating device, which generates a wide-range, multi-level, and proportional reference voltage to achieve a large range of output current levels.

[0009] One embodiment of the present invention provides a wide-range reference voltage generating device, which includes a digital selection circuit and a wide-range voltage generating circuit. The digital selection circuit is coupled to a first high-voltage terminal and a first low-voltage terminal. The digital selection circuit selects one of a plurality of different digital signals as a control digital signal output. The wide-range voltage generating circuit is coupled to the digital selection circuit, a second high-voltage terminal, and a second low-voltage terminal. The wide-range voltage generating circuit receives the control digital signal and generates a separate reference voltage accordingly using a voltage divider method.

[0010] In one embodiment of the present invention, the digital selection circuit includes a plurality of switches and a plurality of first resistors. One end of the plurality of first resistors is coupled to a first high-voltage terminal, and the other end of the plurality of first resistors is respectively coupled to one end of the plurality of switches and a wide-range voltage generating circuit. The other end of the plurality of switches is coupled to a first low-voltage terminal. At least one of the first high-voltage terminal and the first low-voltage terminal is used to generate a control digital signal through the plurality of switches and the plurality of first resistors according to the switching state of the plurality of switches.

[0011] In one embodiment of the present invention, the multiple switches are implemented as a dial-type multi-bit DIP switch or a rotary multi-bit binary coded switch.

[0012] In one embodiment of the invention, the number of switches is equal to the number of first resistors. The wide-range voltage generation circuit includes a path switching circuit, a second resistor, and multiple third resistors. The path switching circuit is coupled to the multiple switches and the multiple first resistors, and is used to receive control digital signals. One end of the second resistor is coupled to a second high-voltage terminal, and the other end is coupled to the path switching circuit. The number of third resistors is 2. NN represents the number of switches. One end of each of the multiple third resistors is coupled to a second low-voltage terminal, and the other end of each third resistor is coupled to a path switching circuit. The path switching circuit is used to couple the second resistor to one of the multiple third resistors according to a control digital signal, and to decouple the second resistor from the remaining multiple third resistors. The second high-voltage terminal and the second low-voltage terminal are used to generate individual reference voltages at the node between the path switching circuit and the second resistor through the mutually coupled second and third resistors.

[0013] In one embodiment of the invention, the number of switches is equal to the number of first resistors. The wide-range voltage generation circuit includes a path switching circuit, a second resistor, and multiple third resistors. The path switching circuit is coupled to the multiple switches and the multiple first resistors, and the path switching circuit is used to receive control digital signals. One end of the second resistor is coupled to a second low-voltage terminal, and the other end is coupled to the path switching circuit. The number of third resistors is 2. N N represents the number of switches. One end of each of the multiple third resistors is coupled to a second high-voltage terminal, and the other end of each third resistor is coupled to a path switching circuit. The path switching circuit is used to couple the second resistor to one of the multiple third resistors according to a control digital signal, and to decouple the second resistor from the remaining multiple third resistors. The second high-voltage terminal and the second low-voltage terminal are used to generate individual reference voltages at the node between the path switching circuit and the second resistor through the mutually coupled second and third resistors.

[0014] One embodiment of the present invention provides a load driving device coupled to a load. The load driving device includes a digital selection circuit, a wide-range voltage generation circuit, and a power driving circuit. The digital selection circuit is coupled to a first high-voltage terminal and a first low-voltage terminal, wherein the digital selection circuit is used to select one of a plurality of different digital signals as a control digital signal output. The wide-range voltage generation circuit is coupled to the digital selection circuit, a second high-voltage terminal, and a second low-voltage terminal. The wide-range voltage generation circuit is used to receive the control digital signal and generate a separate reference voltage accordingly using a voltage divider method. The power driving circuit is coupled to the load and the wide-range voltage generation circuit, wherein the power driving circuit is used to receive the separate reference voltage and an AC voltage, and drive the load accordingly.

[0015] In one embodiment of the present invention, the digital selection circuit includes a plurality of switches and a plurality of first resistors. One end of the plurality of first resistors is coupled to a first high-voltage terminal, and the other end of the plurality of first resistors is respectively coupled to one end of the plurality of switches and a wide-range voltage generating circuit. The other end of the plurality of switches is coupled to a first low-voltage terminal. At least one of the first high-voltage terminal and the first low-voltage terminal is used to generate a control digital signal through the plurality of switches and the plurality of first resistors according to the switching state of the plurality of switches.

[0016] In one embodiment of the present invention, the multiple switches are implemented as a dial-type multi-bit DIP switch or a rotary multi-bit binary coded switch.

[0017] In one embodiment of the invention, the number of switches is equal to the number of first resistors. The wide-range voltage generation circuit includes a path switching circuit, a second resistor, and multiple third resistors. The path switching circuit is coupled to the multiple switches and the multiple first resistors, and is used to receive control digital signals. One end of the second resistor is coupled to a second high-voltage terminal, and the other end is coupled to the path switching circuit. The node between the path switching circuit and the second resistor is coupled to a power drive circuit. The number of third resistors is 2. N N represents the number of switches. One end of each of the multiple third resistors is coupled to a second low-voltage terminal, and the other end of each third resistor is coupled to a path switching circuit. The path switching circuit is used to couple the second resistor to one of the multiple third resistors according to a control digital signal, and to decouple the second resistor from the remaining multiple third resistors. The second high-voltage terminal and the second low-voltage terminal are used to generate individual reference voltages at the node between the path switching circuit and the second resistor through the mutually coupled second and third resistors.

[0018] In one embodiment of the invention, the number of switches is equal to the number of first resistors. The wide-range voltage generation circuit includes a path switching circuit, a second resistor, and multiple third resistors. The path switching circuit is coupled to the multiple switches and the multiple first resistors, and is used to receive control digital signals. One end of the second resistor is coupled to a second low-voltage terminal, and the other end is coupled to the path switching circuit, wherein the node between the path switching circuit and the second resistor is coupled to a power drive circuit. The number of third resistors is 2. N N represents the number of switches. One end of each of the multiple third resistors is coupled to a second high-voltage terminal, and the other end of each third resistor is coupled to a path switching circuit. The path switching circuit is used to couple the second resistor to one of the multiple third resistors according to a control digital signal, and to decouple the second resistor from the remaining multiple third resistors. The second high-voltage terminal and the second low-voltage terminal are used to generate individual reference voltages at the node between the path switching circuit and the second resistor through the mutually coupled second and third resistors.

[0019] In one embodiment of the invention, the power drive circuit includes an AC-DC converter and a DC converter. The AC-DC converter receives an AC voltage and converts it into a DC voltage. The DC converter is coupled to the AC-DC converter, a wide-range voltage generation circuit, and a load. The DC converter receives an individual reference voltage and a DC voltage, and converts the DC voltage into a DC current based on the individual reference voltage to drive the load.

[0020] In one embodiment of the invention, the power drive circuit includes an AC-DC converter, a current detector, and a current feedback circuit. The AC-DC converter receives an AC voltage and a current feedback value, and converts the AC voltage into a DC voltage based on the current feedback value, thereby providing a DC current. The DC current drives the load through the current detector, which is coupled to the AC-DC converter and the load. The current detector detects the DC current to generate a current detection value. The current feedback circuit is coupled to a wide-range voltage generation circuit, the current detector, and the AC-DC converter. The current feedback circuit receives an individual reference voltage and the current detection value, and generates a current feedback value accordingly.

[0021] In one embodiment of the present invention, an electronic control setting device is also provided, coupled to an electronic device. The electronic control setting device includes a digital selection circuit and a microcontroller. The digital selection circuit is coupled to a first high-voltage terminal and a first low-voltage terminal, wherein the digital selection circuit is used to select one of a plurality of different digital signals as a control digital signal output. The microcontroller is coupled to the digital selection circuit and the electronic device. The microcontroller is used to receive the control digital signal and set the operating mode or communication address code of the electronic device accordingly. The plurality of digital signals correspond to different operating modes or different communication address codes.

[0022] In one embodiment of the present invention, the digital selection circuit includes a plurality of switches and a plurality of first resistors. One end of the plurality of first resistors is coupled to a first high-voltage terminal, and the other end of the plurality of first resistors is respectively coupled to one end of the plurality of switches and a microcontroller. The other end of the plurality of switches is coupled to a first low-voltage terminal. At least one of the first high-voltage terminal and the first low-voltage terminal is used to generate a control digital signal through the plurality of switches and the plurality of first resistors according to the switching state of the plurality of switches.

[0023] In one embodiment of the present invention, the multiple switches are implemented as a dial-type multi-bit DIP switch or a rotary multi-bit binary coded switch.

[0024] In one embodiment of the present invention, the electronic control setting device further includes a wide-range voltage generation circuit coupled to a microcontroller, a plurality of switches, a plurality of first resistors, a second high-voltage terminal, and a second low-voltage terminal. The wide-range voltage generation circuit receives control digital signals and generates individual reference voltages in a voltage divider manner accordingly. The microcontroller receives the individual reference voltages and sets the operating mode or communication address code accordingly.

[0025] In one embodiment of the invention, the number of switches is equal to the number of first resistors. The wide-range voltage generation circuit includes a path switching circuit, a second resistor, and multiple third resistors. The path switching circuit is coupled to the multiple switches and the multiple first resistors, and is used to receive control digital signals. One end of the second resistor is coupled to a second high-voltage terminal, and the other end is coupled to the path switching circuit and the microcontroller. The number of third resistors is 2. N N represents the number of switches. One end of each of the multiple third resistors is coupled to a second low-voltage terminal, and the other end of each third resistor is coupled to a path switching circuit. The path switching circuit is used to couple the second resistor to one of the multiple third resistors according to a control digital signal, and to decouple the second resistor from the remaining multiple third resistors. The second high-voltage terminal and the second low-voltage terminal are used to generate individual reference voltages at the node between the path switching circuit and the second resistor through the mutually coupled second and third resistors.

[0026] In one embodiment of the invention, the number of switches is equal to the number of first resistors. The wide-range voltage generation circuit includes a path switching circuit, a second resistor, and multiple third resistors. The path switching circuit is coupled to the multiple switches and the multiple first resistors, and is used to receive control digital signals. One end of the second resistor is coupled to a second low-voltage terminal, and the other end is coupled to the path switching circuit and the microcontroller. The number of third resistors is 2. N N represents the number of switches. One end of each of the multiple third resistors is coupled to a second high-voltage terminal, and the other end of each third resistor is coupled to a path switching circuit. The path switching circuit is used to couple the second resistor to one of the multiple third resistors according to a control digital signal, and to decouple the second resistor from the remaining multiple third resistors. The second high-voltage terminal and the second low-voltage terminal are used to generate individual reference voltages at the node between the path switching circuit and the second resistor through the mutually coupled second and third resistors.

[0027] Based on the above, the load drive device and its wide-range reference voltage generating device utilize a digital selection circuit and a wide-range voltage generating circuit to generate a wide-range, multi-level, and proportional reference voltage through voltage division, thereby achieving a large span of output current levels. The electronic control setting device uses a digital selection circuit to select one of several different digital signals as the control digital signal, and accordingly sets the operating mode or communication address code of the electronic device. In this way, different operating modes or different communication address codes of the electronic device can be set. Attached Figure Description

[0028] Figure 1 This is a circuit diagram of a light-emitting diode driving device in the prior art.

[0029] Figure 2 This is a circuit diagram of another existing LED driving device.

[0030] Figure 3 This is a circuit diagram of another existing light-emitting diode driving device.

[0031] Figure 4 This is a circuit diagram of a first embodiment of the wide-range reference voltage generating device of the present invention.

[0032] Figure 5 This is a circuit diagram of a second embodiment of the wide-range reference voltage generating device of the present invention.

[0033] Figure 6 This is a circuit diagram of a third embodiment of the wide-range reference voltage generating device of the present invention.

[0034] Figure 7 This is a circuit diagram of one embodiment of the path switching circuit of the present invention.

[0035] Figure 8 This is a circuit diagram of an embodiment of the logic gate of the present invention.

[0036] Figure 9 This is a circuit diagram of an embodiment of the load driving device of the present invention.

[0037] Figure 10 This is a circuit diagram of a first embodiment of the power drive circuit of the present invention.

[0038] Figure 11 This is a circuit diagram of a second embodiment of the power drive circuit of the present invention.

[0039] Figure 12 This is a circuit diagram of the first embodiment of the electronic control setting device of the present invention.

[0040] Figure 13 This is a circuit diagram of a second embodiment of the electronic control setting device of the present invention.

[0041] Figure labeling: 10-Switch; 12-Resistor; 14-Resistor; 16-Power drive circuit; 18-Light emission diode; 20-Switch; 22-Microcontroller; 24-Power drive circuit; 26-Switch; 28-Resistor; 30-Digital selection circuit; 32-Wide range voltage generation circuit; 34-Path switching circuit; 36-Level offset; 38-First inverter; 40-Inverter; 42-Second inverter; 44-Logic gate; 46, 48, 50, 52, 54-Transistor; 56-Load drive device; 58-Load; 60-Power drive circuit; 62-AC / DC converter; 64-DC converter; 66-AC / DC converter; 68-Current. Detector; 70 - Current feedback circuit; 72 - Electrical control setting device; 74 - Electronic device; 76 - Microcontroller; CS - Current sampling value; VCC, VDD - High voltage; CD - Control digital signal; VR - Individual reference voltage; S1, S2, S3 - Switches; R1, R2, R3 - First resistor; R4 - Second resistor; R5, R6, R7, R8, R9, R10, R11, R12 - Third resistor; N1, N2, N3, No - Nodes; Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8 - Output nodes; AC - Alternating current voltage; ID - Direct current; DV - Current detection value; FV - Current feedback value; IL - Direct current. Detailed Implementation

[0042] Embodiments of the present invention will be further explained below with reference to the accompanying drawings. Wherever possible, the same reference numerals represent the same or similar components in the drawings and description. In the drawings, shapes and thicknesses may be exaggerated for simplicity and convenience. It is understood that elements not specifically shown in the drawings or described in the description are forms known to those skilled in the art. Those skilled in the art can make various changes and modifications based on the content of this invention.

[0043] Unless otherwise specified, certain conditional clauses or words, such as "can," "could," "might," or "may," are generally intended to express features, elements, or steps that are present in the embodiments of this invention, but may also be interpreted as features, elements, or steps that may not be required. In other embodiments, these features, elements, or steps may be unnecessary.

[0044] In the following description of "one embodiment" or "an embodiment," the term refers to a specific element, structure, or feature associated with at least one embodiment. Therefore, the multiple descriptions of "one embodiment" or "an embodiment" appearing in various places below do not refer to the same embodiment. Furthermore, specific components, structures, and features in one or more embodiments may be combined in a suitable manner.

[0045] Certain terms are used in the specification and claims to refer to specific elements. However, those skilled in the art will understand that the same element may be referred to by different names. The specification and claims do not distinguish elements by differences in name, but by differences in function. The word "comprising" in the specification and claims is an open-ended term and should be interpreted as "including but not limited to". Furthermore, "coupled" here includes any direct and indirect connection means. Therefore, if the text describes a first element coupled to a second element, it means that the first element can be directly connected to the second element through electrical connection or signal connection methods such as wireless transmission or optical transmission, or indirectly electrically or signal connected to the second element through other elements or connection means.

[0046] This invention is described in particular by way of the following examples, which are merely illustrative. Various modifications and refinements can be made by those skilled in the art without departing from the spirit and scope of this invention. Therefore, the scope of protection of this invention is determined by the appended claims. Throughout the specification and claims, unless explicitly specified, the words “a” and “described” include such a description as “a or at least one” of the components or ingredients. Furthermore, as used herein, the singular article also includes descriptions of multiple components or ingredients unless clearly excluded from the specific context. Moreover, when applied in this description and all the following claims, unless explicitly specified, “in which” can mean both “in which” and “therein”. The terms used throughout the specification and claims, unless otherwise specified, generally have their ordinary meaning in the art, in the context of this invention, and in the specific context. Certain terms used to describe the invention will be discussed below or elsewhere in this specification to provide additional guidance to practitioners in describing the invention. Examples throughout this specification, including examples of any terms discussed herein, are for illustrative purposes only and do not limit the scope or meaning of the invention or any of the illustrative terms. Similarly, the invention is not limited to the various embodiments set forth in this specification.

[0047] The following description provides an electronic control setting device, a load drive device, and a wide-range reference voltage generating device thereof. The load drive device and the wide-range reference voltage generating device utilize a digital selection circuit and a wide-range voltage generating circuit to generate a wide-range, multi-level, and proportional reference voltage using a voltage divider method, thereby achieving a large span of output current levels. The electronic control setting device uses a digital selection circuit to select one of several different digital signals as the control digital signal, and sets the operating mode or communication address code of the electronic device accordingly. In this way, different operating modes or different communication address codes of the electronic device can be set.

[0048] Figure 4 This is a circuit diagram of a first embodiment of the wide-range reference voltage generating device of the present invention. Please refer to... Figure 4 The following describes a first embodiment of a wide-range reference voltage generating device. The wide-range reference voltage generating device includes a digital selection circuit 30 and a wide-range voltage generating circuit 32. The digital selection circuit 30 is coupled to a first high-voltage terminal and a first low-voltage terminal, where the high voltage of the first high-voltage terminal is denoted by VCC, and the first low-voltage terminal is, for example, ground. The wide-range voltage generating circuit 32 is coupled to the digital selection circuit 30, a second high-voltage terminal, and a second low-voltage terminal, where the high voltage of the second high-voltage terminal is denoted by VDD, and the second low-voltage terminal is also, for example, ground. VDD is less than or equal to VCC. For example, the digital selection circuit 30 may include a dial-up multi-bit DIP switch or a rotary multi-bit binary coded switch. The wide-range voltage generating circuit 32 can be implemented using an 8-to-1 or 16-to-1 analog switch chip, such as the 74HC4051, 74HC4067, or other chips with similar functions. The digital selection circuit 30 selects one of several different digital signals as the control digital signal CD. The wide-range voltage generation circuit 32 receives the control digital signal CD and generates an individual reference voltage VR using a voltage divider method. If the DIP switch is a 3-bit DIP switch, it indicates that there are eight types of digital signals. In this case, it can be used with an 8-to-1 analog switch chip to generate eight individual reference voltages VR. If the DIP switch is a 4-bit DIP switch, it indicates that there are sixteen types of digital signals. In this case, it can be used with a 16-to-1 analog switch chip to generate sixteen individual reference voltages VR, thereby achieving a wide range, multiple levels, and proportional reference voltages to realize a large span of output current levels.

[0049] Figure 5 This is a circuit diagram of a second embodiment of the wide-range reference voltage generating device of the present invention. Please refer to... Figure 4 and Figure 5The following describes a second embodiment of the wide-range reference voltage generating device. In this second embodiment, the digital selection circuit 30 includes multiple switches S1, S2, and S3 and multiple first resistors R1, R2, and R3. The number of switches S1, S2, and S3 and the number of first resistors R1, R2, and R3 are all exemplified here as three, but the present invention does not limit the number of switches S1, S2, and S3 and the number of first resistors R1, R2, and R3. The number of switches S1, S2, and S3 is equal to the number of first resistors R1, R2, and R3. One end of all first resistors R1, R2, and R3 is coupled to a first high-voltage terminal. The other end of all first resistors R1, R2, and R3 is coupled to one end of all switches S1, S2, and S3 and the wide-range voltage generation circuit 32, respectively. The other end of all switches S1, S2, and S3 is coupled to a first low-voltage terminal. At least one of the first high-voltage terminal and the first low-voltage terminal generates a control digital signal CD through all switches S1, S2, and S3 and all first resistors R1, R2, and R3 according to the switching states of all switches S1, S2, and S3. Switches S1, S2, and S3 can be, but are not limited to, dial-type multi-bit DIP switches or rotary multi-bit binary encoder switches. Node N1 is located between switch S1 and first resistor R1, node N2 is located between switch S2 and first resistor R2, and node N3 is located between switch S3 and first resistor R3. When switches S1, S2, and S3 are in the off, on, and on states respectively, the digital voltages of nodes N1, N2, and N3 are 1, 0, and 0 respectively, meaning the control digital signal CD is 100. When switches S1, S2, and S3 are in the off, off, and on states respectively, the digital voltages of nodes N1, N2, and N3 are 1, 1, and 0 respectively, meaning the control digital signal CD is 110. When switches S1, S2, and S3 are in the off, off, and off states respectively, the digital voltages of nodes N1, N2, and N3 are 1, 1, and 1 respectively, meaning the control digital signal CD is 111. And so on, depending on the different switching states of switches S1, S2, and S3, the control digital signal CD will have eight different signals. If the number of switches is represented by N, the control digital signal CD will have 2... N There are several types, where N is a positive integer greater than or equal to 2.

[0050] The wide-range voltage generation circuit 32 includes a path switching circuit 34, a second resistor R4, and multiple third resistors R5, R6, R7, R8, R9, R10, R11, and R12. The path switching circuit 34 is coupled to all switches S1, S2, and S3 and all first resistors R1, R2, and R3. One end of the second resistor R4 is coupled to the second high-voltage terminal, and the other end is coupled to the path switching circuit 34. The number of all third resistors R5, R6, R7, R8, R9, R10, R11, and R12 is 2. NOne end of the third resistors R5, R6, R7, R8, R9, R10, R11, and R12 is coupled to the second low-voltage terminal, and the other end of the third resistors R5, R6, R7, R8, R9, R10, R11, and R12 is coupled to the path switching circuit 34. The path switching circuit 34 can be coupled to the first high-voltage terminal and the first low-voltage terminal. The path switching circuit 34 receives a control digital signal CD. According to the control digital signal CD, the path switching circuit couples the second resistor R4 to one of the third resistors R5, R6, R7, R8, R9, R10, R11, and R12, and decouples the remaining resistors from the second resistor R4 to the third resistors R5, R6, R7, R8, R9, R10, R11, and R12. The second high-voltage terminal and the second low-voltage terminal are coupled to each other through a second resistor R4 and a third resistor R5, R6, R7, R8, R9, R10, R11, or R12. At node No between the path switching circuit 34 and the second resistor R4, an individual reference voltage VR is generated. For example, when the control digital signal CD is 100, the path switching circuit couples the second resistor R4 to the third resistor R5 and decouples the second resistor R4 to the third resistors R6, R7, R8, R9, R10, R11, and R12, making the individual reference voltage VR = VDD × R5 / (R4 + R5). When the control digital signal CD is 110, the path switching circuit couples the second resistor R4 to the third resistor R6 and decouples the second resistor R4 to the third resistors R5, R7, R8, R9, R10, R11, and R12, making the individual reference voltage VR = VDD × R6 / (R4 + R6). When the control digital signal CD is 111, the path switching circuit couples the second resistor R4 to the third resistor R7 and decouples the second resistor R4 to the third resistors R5, R6, R8, R9, R10, R11 and R12, making the individual reference voltage VR = VDD × R7 / (R4 + R7). Therefore, the individual reference voltage VR = VDD × Rx / (R4 + Rx), where x = 5, 6, 7, 8, 9, 10, 11 or 12.

[0051] Figure 6 This is a circuit diagram of a third embodiment of the wide-range reference voltage generating device of the present invention. Please refer to [link / reference]. Figure 4 and Figure 6The following describes a third embodiment of the wide-range reference voltage generating device. The difference between the third and second embodiments lies in the wide-range voltage generating circuit 32. In the third embodiment, the wide-range voltage generating circuit 32 includes a path switching circuit 34, a second resistor R4, and multiple third resistors R5, R6, R7, R8, R9, R10, R11, and R12. The path switching circuit 34 is coupled to all switches S1, S2, and S3 and all first resistors R1, R2, and R3. One end of the second resistor R4 is coupled to a second low-voltage terminal, and the other end is coupled to the path switching circuit 34. The number of all third resistors R5, R6, R7, R8, R9, R10, R11, and R12 is 2. N One end of the third resistors R5, R6, R7, R8, R9, R10, R11, and R12 is coupled to the second high-voltage terminal, and the other end of the third resistors R5, R6, R7, R8, R9, R10, R11, and R12 is coupled to the path switching circuit 34. The path switching circuit 34 can be coupled to the first high-voltage terminal and the first low-voltage terminal. The path switching circuit 34 receives a control digital signal CD. According to the control digital signal CD, the path switching circuit couples the second resistor R4 to one of the third resistors R5, R6, R7, R8, R9, R10, R11, and R12, and decouples the remaining two resistors from the second resistor R4 to the third resistors R5, R6, R7, R8, R9, R10, R11, and R12. The second high-voltage terminal and the second low-voltage terminal are coupled to each other through a second resistor R4 and a third resistor R5, R6, R7, R8, R9, R10, R11, or R12. At node No between the path switching circuit 34 and the second resistor R4, an individual reference voltage VR is generated. For example, when the control digital signal CD is 100, the path switching circuit couples the second resistor R4 to the third resistor R5 and decouples the second resistor R4 to the third resistors R6, R7, R8, R9, R10, R11, and R12, making the individual reference voltage VR = VDD × R5 / (R4 + R5). When the control digital signal CD is 110, the path switching circuit couples the second resistor R4 to the third resistor R6 and decouples the second resistor R4 to the third resistors R5, R7, R8, R9, R10, R11, and R12, making the individual reference voltage VR = VDD × R6 / (R4 + R6). When the control digital signal CD is 111, the path switching circuit couples the second resistor R4 to the third resistor R7 and decouples the second resistor R4 to the third resistors R5, R6, R8, R9, R10, R11 and R12, making the individual reference voltage VR = VDD × R7 / (R4 + R7). Therefore, the individual reference voltage VR = VDD × Rx / (R4 + Rx), where x = 5, 6, 7, 8, 9, 10, 11 or 12.

[0052] Figure 7 This is a circuit diagram illustrating one embodiment of the path switching circuit of the present invention. Please refer to [link / reference]. Figure 7 The path switching circuit 34 can Figure 7 The architecture is as described, but the present invention is not limited thereto. The path switching circuit 34 may include multiple level offsets 36, multiple first inverters 38, multiple inverse OR gates 40, multiple second inverters 42, and multiple logic gates 44, and their connection relationships are as follows: Figure 7 As shown. All logic gates 44 are coupled to node No, and are respectively coupled to output nodes Y1, Y2, Y3, Y4, Y5, Y6, Y7 and Y8. Output nodes Y1, Y2, Y3, Y4, Y5, Y6, Y7 and Y8 are respectively coupled to Figure 5 and Figure 6 The third resistors are R5, R6, R7, R8, R9, R10, R11, and R12. When the digital voltages of nodes N1, N2, and N3 are 0, 0, and 0 respectively, node No is only coupled to output node Y1. When the digital voltages of nodes N1, N2, and N3 are 0, 0, and 1 respectively, node No is only coupled to output node Y2. When the digital voltages of nodes N1, N2, and N3 are 0, 1, and 0 respectively, node No is only coupled to output node Y3. When the digital voltages of nodes N1, N2, and N3 are 0, 1, and 1 respectively, node No is only coupled to output node Y4. When the digital voltages of nodes N1, N2, and N3 are 1, 0, and 0 respectively, node No is only coupled to output node Y5. When the digital voltages of nodes N1, N2, and N3 are 1, 0, and 1 respectively, node No is only coupled to output node Y6. When the digital voltages of nodes N1, N2, and N3 are 1, 1, and 0 respectively, node No is only coupled to output node Y7. When the digital voltages of nodes N1, N2 and N3 are 1, 1 and 1 respectively, node No is only coupled to output node Y8.

[0053] Figure 8 This is a circuit diagram illustrating an embodiment of the logic gate of the present invention. The logic gate 44 can... Figure 8 The circuit implementation is described, but the invention is not limited thereto. The logic gate 44 may include mutually coupled transistors 46, 48, 50, 52, and 54, with their specific connection relationships as follows: Figure 8 As shown. Transistors 52 and 54 are coupled to output node Yn and node No, where n = 1, 2, 3, 4, 5, 6, 7 or 8.

[0054] Figure 9 This is a circuit diagram of an embodiment of the load driving device of the present invention. Please refer to [link / reference]. Figure 9The following describes a load drive device 56 coupled to a load 58, such as a light-emitting diode (LED). The load drive device 56 includes a digital selection circuit 30, a wide-range voltage generation circuit 32, and a power drive circuit 60. The digital selection circuit 30 is coupled to a first high-voltage terminal and a first low-voltage terminal, where the high voltage of the first high-voltage terminal is denoted by VCC, and the first low-voltage terminal is grounded, for example. The wide-range voltage generation circuit 32 is coupled to the digital selection circuit 30, a second high-voltage terminal, and a second low-voltage terminal, where the high voltage of the second high-voltage terminal is denoted by VDD, and the second low-voltage terminal is also grounded, for example. For instance, the digital selection circuit 30 may include a dial-up multi-bit switch or a rotary multi-bit binary code switch. The wide-range voltage generation circuit 32 can be implemented using an 8-to-1 or 16-to-1 analog switch chip, such as the 74HC4051, 74HC4067, or other chips with similar functions. The power drive circuit 60 is coupled to the load 58 and the wide-range voltage generation circuit 30. The digital selection circuit 30 selects one of several different digital signals as the output control digital signal CD. The wide-range voltage generation circuit 32 receives the control digital signal CD and generates an individual reference voltage VR using a voltage divider method. If the DIP switch is a 3-bit DIP switch, it indicates that there are eight digital signals. In this case, it can be used with an 8-to-1 analog switch chip to generate eight individual reference voltages VR. If the DIP switch is a 4-bit DIP switch, it indicates that there are sixteen digital signals. In this case, it can be used with a 16-to-1 analog switch chip to generate sixteen individual reference voltages VR, thereby achieving a wide range, multiple levels, and proportional reference voltages to realize a large span of output current level settings. The power drive circuit 60 receives the individual reference voltage VR and an AC voltage AC, and drives the load 58 accordingly. The digital selection circuit 30 and the wide-range voltage generation circuit 32 can... Figure 5 or Figure 6 The circuitry can be used to implement this, but the invention is not limited thereto. For example, for a 25-watt model, the output current range can be 300–1050 milliamperes; for a 40-watt model, the output current range can be 600–1400 milliamperes; and for a 60-watt model, the output current range can be 900–1700 milliamperes.

[0055] Figure 10This is a circuit diagram of a first embodiment of the power drive circuit of the present invention. Referring to Figures 10, 5, and 6, a first embodiment of the power drive circuit 60 is described below. The power drive circuit 60 includes an AC-DC converter 62 and a DC converter 64. The DC converter 64 is coupled to the AC-DC converter 62, node No of the wide-range voltage generation circuit 32, and the load 58. The AC-DC converter 62 receives an AC voltage AC and converts it into a DC voltage DC. The DC converter 62 receives an individual reference voltage VR and a DC voltage DC, and converts the DC voltage DC into a DC current ID based on the individual reference voltage VR to drive the load 58.

[0056] Figure 11 This is a circuit diagram of a second embodiment of the power drive circuit of the present invention. Please refer to [link / reference]. Figure 11 , Figure 5 and Figure 6 The following describes a second embodiment of the power drive circuit 60. The power drive circuit 60 includes an AC / DC converter 66, a current detector 68, and a current feedback circuit 70. The current detector 68 is coupled to the AC / DC converter 66 and the load 58. The current feedback circuit 70 is coupled to node No of the wide-range voltage generation circuit 32, the current detector 68, and the AC / DC converter 66. The AC / DC converter 66 receives an AC voltage AC and a current feedback value FV, and converts the AC voltage AC into a DC voltage according to the current feedback value FV, thereby providing a DC current IL. The DC current IL drives the load 58 through the current detector 68. The current detector 68 detects the DC current IL to generate a current detection value DV. The current feedback circuit 70 receives an individual reference voltage VR and the current detection value DV, and generates a current feedback value FV accordingly.

[0057] Figure 12 This is a circuit diagram of a first embodiment of the electronic control setting device of the present invention. Please refer to [link / reference]. Figure 12The following describes a first embodiment of the electronic control setting device 72. The electronic control setting device 72 is coupled to an electronic device 74. The electronic control setting device 72 includes a digital selection circuit 30 and a microcontroller 76, and it is assumed that the microcontroller 76 has multiple input pins. The digital selection circuit 30 is coupled to a first high-voltage terminal and a first low-voltage terminal, where the high voltage of the first high-voltage terminal is represented by VCC, and the first low-voltage terminal is, for example, ground. The microcontroller 76 is coupled to the digital selection circuit 30 via multiple input pins and to the electronic device 74 via output pins. For example, the digital selection circuit 30 may include a dial-up multi-bit switch or a rotary multi-bit binary encoder switch. The digital selection circuit 30 selects one of multiple different digital signals as the output control digital signal CD. The microcontroller 76 receives the control digital signal CD and sets the operating mode or communication address code of the electronic device 74 accordingly, where each digital signal corresponds to a different operating mode or a different communication address code. If the DIP switch is a 3-bit switch, it indicates eight possible digital signals, and thus eight possible operating modes or communication address codes. If the DIP switch is a 4-bit switch, it indicates sixteen possible digital signals, and thus sixteen possible operating modes or communication address codes. The digital selection circuit 30 can... Figure 5 or Figure 6 The invention is implemented using a circuit, but is not limited thereto. When the digital selection circuit 30 is... Figure 5 or Figure 6 When implemented in the circuit, nodes N1, N2 and N3 located at one end of the first resistors R1, R2 and R3 respectively are coupled to the microcontroller 76.

[0058] Figure 13 This is a circuit diagram of a second embodiment of the electronically controlled setting device of the present invention. Please refer to [link / reference]. Figure 13 , Figure 5 and Figure 6Assuming the microcontroller 76 has a single input pin instead of multiple input pins, a second embodiment of the electronic control setting device 72 is described below. The difference between the first and second embodiments of the electronic control setting device 72 is that the second embodiment further includes a wide-range voltage generation circuit 32, which is coupled to the microcontroller 76, all switches S1, S2, and S3, all first resistors R1, R2, and R3, a second high-voltage terminal, and a second low-voltage terminal. The microcontroller 76 is coupled to the wide-range voltage generation circuit 32 via a single input pin. The high voltage of the second high-voltage terminal is represented by VDD, and the second low-voltage terminal is also exemplified by ground. The wide-range voltage generation circuit 32 can be implemented using an 8-to-1 or 16-to-1 analog switch chip, such as chips of model 74HC4051, 74HC4067, or other chips with similar functions. The wide-range voltage generation circuit 32 receives a control digital signal CD and generates an individual reference voltage VR using a voltage divider method. The microcontroller receives the individual reference voltage VR and sets the operating mode or communication address code accordingly. If the DIP switch is a 3-bit switch, it indicates eight digital signal types. In this case, it can be used with an 8-to-1 analog switch chip to provide eight individual reference voltages VR, and eight operating modes or communication address codes. If the DIP switch is a 4-bit switch, it indicates sixteen digital signal types. In this case, it can be used with a 16-to-1 analog switch chip to provide sixteen individual reference voltages VR, and sixteen operating modes or communication address codes, thus achieving a wide range, multiple levels, and proportional reference voltages to realize a large span of output current levels. Currently, the analog-to-digital conversion function of the microcontroller 76 has a resolution of no less than 8 bits, and can even be 10 bits, therefore it can provide 256 or 1024 current levels, which is more than sufficient for use with 3-bit or 4-bit DIP switches. The wide-range voltage generation circuit 32 can... Figure 5 or Figure 6 The circuit is used to implement this, but the invention is not limited thereto. When the wide-range voltage generation circuit 32 is used... Figure 5 or Figure 6 When implemented using the circuit, node No is coupled to the input pin of the microcontroller 76.

[0059] According to the above embodiments, the load drive device and its wide-range reference voltage generating device utilize a digital selection circuit and a wide-range voltage generating circuit to generate a wide-range, multi-level, and proportional reference voltage through voltage division, thereby achieving a large span of output current levels. The electronic control setting device uses the digital selection circuit to select one of several different digital signals as the control digital signal, and sets the operating mode or communication address code of the electronic device accordingly. In this way, different operating modes or different communication address codes of the electronic device can be set.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, all equivalent variations and modifications made in accordance with the shape, structure, features and spirit described in the claims of the present invention should be included within the scope of the present invention.

Claims

1. A wide-range reference voltage generating device, characterized in that, The application comprises: a digital selection circuit coupled to a first high voltage terminal and a first low voltage terminal, wherein the digital selection circuit is configured to select one of a plurality of digital signals as a control digital signal output; a wide range voltage generation circuit coupled to the digital selection circuit, a second high voltage terminal and a second low voltage terminal, wherein the wide range voltage generation circuit is configured to receive the control digital signal and generate a plurality of individual reference voltages in a voltage dividing manner accordingly; and the digital selection circuit comprises a plurality of switches and a plurality of first resistors, one end of the plurality of first resistors is coupled to the first high voltage terminal, the other end of the plurality of first resistors is coupled to the wide range voltage generation circuit and one end of the plurality of switches respectively, the other end of the plurality of switches is coupled to the first low voltage terminal, at least one of the first high voltage terminal and the first low voltage terminal is configured to generate the control digital signal through the plurality of switches and the plurality of first resistors according to the switch state of the plurality of switches. The plurality of switches is implemented by a dial multi-bit switch or a rotary multi-bit binary encoding switch.

2. The wide range reference voltage generating device of claim 1, wherein, The number of the plurality of switches is equal to the number of the plurality of first resistors, the wide range voltage generation circuit comprises:

3. The wide range reference voltage generating device of claim 1, wherein, a path switching circuit coupled to the plurality of switches and the plurality of first resistors, wherein the path switching circuit is configured to receive the control digital signal; a second resistor having one end coupled to the second high voltage terminal and the other end coupled to the path switching circuit; and The number of the plurality of switches is equal to the number of the plurality of first resistors, the wide range voltage generation circuit comprises: a plurality of third resistors, the number of which is 2 N , N is the number of the plurality of switches, one end of the plurality of third resistors is coupled to the second low voltage terminal, the other end of the plurality of third resistors is coupled to the path switching circuit, wherein the path switching circuit is used to couple the second resistor to one of the plurality of third resistors and decouple the second resistor from the rest of the plurality of third resistors according to the control digital signal, the second high voltage terminal and the second low voltage terminal are used to generate the individual reference voltage at a node between the path switching circuit and the second resistor through the second resistor and the third resistor coupled to each other.

4. The wide range reference voltage generating device of claim 1, wherein, a path switching circuit coupled to the plurality of switches and the plurality of first resistors, wherein the path switching circuit is configured to receive the control digital signal; a second resistor having one end coupled to the second low voltage terminal and the other end coupled to the path switching circuit; and The load driving device comprises: a plurality of third resistors, the number of which is 2 N , N is the number of the plurality of switches, one end of the plurality of third resistors is coupled to the second high voltage terminal, the other end of the plurality of third resistors is coupled to the path switching circuit, wherein the path switching circuit is used to couple the second resistor to one of the plurality of third resistors and decouple the second resistor from the rest of the plurality of third resistors according to the control digital signal, the second high voltage terminal and the second low voltage terminal are used to generate the individual reference voltage at a node between the path switching circuit and the second resistor through the second resistor and the third resistor coupled to each other.

5. A load driving device coupled to a load, characterized in that, a digital selection circuit coupled to a first high voltage terminal and a first low voltage terminal, wherein the digital selection circuit is configured to select one of a plurality of digital signals as a control digital signal output; a wide range voltage generation circuit coupled to the digital selection circuit, a second high voltage terminal and a second low voltage terminal, wherein the wide range voltage generation circuit is configured to receive the control digital signal and generate a plurality of individual reference voltages in a voltage dividing manner accordingly; and a power driving circuit coupled to the load and the wide range voltage generation circuit, wherein the power driving circuit is configured to receive the plurality of individual reference voltages and an alternating voltage and drive the load accordingly. ​ The digital selection circuit includes a plurality of switches and a plurality of first resistors. One end of the plurality of first resistors is coupled to the first high voltage terminal. The other end of the plurality of first resistors is coupled to one end of the plurality of switches and the wide range voltage generating circuit. The other end of the plurality of switches is coupled to the first low voltage terminal. At least one of the first high voltage terminal and the first low voltage terminal is used to generate the control digital signal through the plurality of switches and the plurality of first resistors according to the switch state of the plurality of switches.

6. The load driving apparatus according to claim 5, wherein The plurality of switches is implemented as a dial multi-bit switch or a rotary multi-bit binary encoding switch.

7. The load driving apparatus according to claim 5, wherein The number of the plurality of switches is equal to the number of the plurality of first resistors. The wide range voltage generating circuit includes: a path switching circuit coupled to the plurality of switches and the plurality of first resistors, wherein the path switching circuit is used to receive the control digital signal; a second resistor having one end coupled to the second high voltage terminal and the other end coupled to the path switching circuit, wherein a node between the path switching circuit and the second resistor is coupled to the power driving circuit; and a plurality of third resistors, the number of which is 2 N , N is the number of the plurality of switches, one end of the plurality of third resistors is coupled to the second low voltage terminal, the other end of the plurality of third resistors is coupled to the path switching circuit, wherein the path switching circuit is used to couple the second resistor to one of the plurality of third resistors and decouple the second resistor from the rest of the plurality of third resistors according to the control digital signal, the second high voltage terminal and the second low voltage terminal are used to generate the individual reference voltage at the node between the path switching circuit and the second resistor through the second resistor and the third resistor coupled to each other.

8. The load driving apparatus according to claim 5, wherein The number of the plurality of switches is equal to the number of the plurality of first resistors. The wide range voltage generating circuit includes: a path switching circuit coupled to the plurality of switches and the plurality of first resistors, wherein the path switching circuit is used to receive the control digital signal; a second resistor having one end coupled to the second low voltage terminal and the other end coupled to the path switching circuit, wherein a node between the path switching circuit and the second resistor is coupled to the power driving circuit; and a plurality of third resistors, the number of which is 2 N , N is the number of the plurality of switches, one end of the plurality of third resistors is coupled to the second high voltage terminal, the other end of the plurality of third resistors is coupled to the path switching circuit, wherein the path switching circuit is used to couple the second resistor to one of the plurality of third resistors and decouple the second resistor from the rest of the plurality of third resistors according to the control digital signal, the second high voltage terminal and the second low voltage terminal are used to generate the individual reference voltage at the node between the path switching circuit and the second resistor through the second resistor and the third resistor coupled to each other.

9. The load driving apparatus according to claim 5, wherein The power driving circuit includes: an AC / DC converter used to receive the AC voltage and convert the AC voltage into a DC voltage; and a DC converter coupled to the AC / DC converter, the wide range voltage generating circuit and the load, wherein the DC converter is used to receive the individual reference voltages and the DC voltage and convert the DC voltage into a DC current according to the individual reference voltages to drive the load.

10. The load driving apparatus according to claim 5, wherein The power driving circuit includes: an AC / DC converter used to receive the AC voltage and a current feedback value and convert the AC voltage into a DC voltage according to the current feedback value to provide a DC current; a current detector coupled to the AC / DC converter and the load, wherein the DC current drives the load through the current detector and the current detector detects the DC current to generate a current detection value; and a current feedback circuit coupled to the wide range voltage generating circuit, the current detector and the AC / DC converter, wherein the current feedback circuit is used to receive the individual reference voltages and the current detection value and generate the current feedback value according to the individual reference voltages and the current detection value.

11. An electrically controlled setting device coupled to an electronic device, the electrically controlled setting device comprising: The electronic control setting device includes: a digital selection circuit coupled to a first high voltage terminal and a first low voltage terminal, wherein the digital selection circuit is used to select one of different digital signals as a control digital signal output; and a digital selection circuit coupled to a first high voltage terminal and a first low voltage terminal, wherein the digital selection circuit is used to select one of different digital signals as a control digital signal output; and a microcontroller coupled to the digital selection circuit and the electronic device, wherein the microcontroller is configured to receive the control digital signal and set an operation mode or a communication address code of the electronic device according to the control digital signal, the plurality of digital signals corresponding to different operation modes or different communication address codes, respectively; wherein the digital selection circuit comprises a plurality of switches and a plurality of first resistors, one end of the plurality of first resistors coupled to the first high voltage terminal, the other end of the plurality of first resistors coupled to one end of the plurality of switches and the microcontroller, respectively, the other end of the plurality of switches coupled to the first low voltage terminal, at least one of the first high voltage terminal and the first low voltage terminal configured to generate the control digital signal through the plurality of switches and the plurality of first resistors according to the switch states of the plurality of switches.

12. The electrically controlled setting device according to claim 11, wherein The plurality of switches are implemented as a dial-type multi-bit switch or a rotary-type multi-bit binary encoding switch.

13. The electrically controlled setting device according to claim 11, wherein The application further comprises a wide-range voltage generating circuit coupled to the microcontroller, the plurality of switches, the plurality of first resistors, a second high voltage terminal and a second low voltage terminal, wherein the wide-range voltage generating circuit is configured to receive the control digital signal and generate individual reference voltages according to the control digital signal in a voltage dividing manner, the microcontroller configured to receive the individual reference voltages and set the operation mode or the communication address code according to the individual reference voltages.

14. The electrically controlled setting device according to claim 13, wherein The number of the plurality of switches is equal to the number of the plurality of first resistors, and the wide-range voltage generating circuit comprises: a path switching circuit coupled to the plurality of switches and the plurality of first resistors, wherein the path switching circuit is configured to receive the control digital signal; a second resistor having one end coupled to the second high voltage terminal and the other end coupled to the path switching circuit and the microcontroller; and a plurality of third resistors, the number of which is 2 N N is the number of the plurality of switches, one end of the plurality of third resistors is coupled to the second low voltage terminal, the other end of the plurality of third resistors is coupled to the path switching circuit, wherein the path switching circuit is used to couple the second resistor to one of the plurality of third resistors and decouple the second resistor from the rest of the plurality of third resistors according to the control digital signal, the second high voltage terminal and the second low voltage terminal are used to generate the individual reference voltage at a node between the path switching circuit and the second resistor through the second resistor and the third resistor coupled to each other.

15. The electrically controlled setting device according to claim 13, wherein The number of the plurality of switches is equal to the number of the plurality of first resistors, and the wide-range voltage generating circuit comprises: a path switching circuit coupled to the plurality of switches and the plurality of first resistors, wherein the path switching circuit is configured to receive the control digital signal; a second resistor having one end coupled to the second low voltage terminal and the other end coupled to the path switching circuit and the microcontroller; and The number of the plurality of switches is equal to the number of the plurality of first resistors, and the wide-range voltage generating circuit comprises: a path switching circuit coupled to the plurality of switches and the plurality of first resistors, wherein the path switching circuit is configured to receive the control digital signal; a second resistor having one end coupled to the second low voltage terminal and the other end coupled to the path switching circuit and the microcontroller; and a plurality of third resistors, the number of which is 2 N , N is the number of the plurality of switches, one end of the plurality of third resistors is coupled to the second high voltage terminal, the other end of the plurality of third resistors is coupled to the path switching circuit, wherein the path switching circuit is used to couple the second resistor to one of the plurality of third resistors and decouple the second resistor from the rest of the plurality of third resistors according to the control digital signal, the second high voltage terminal and the second low voltage terminal are used to generate the individual reference voltage at a node between the path switching circuit and the second resistor through the second resistor and the third resistor coupled to each other.

Images