Power supply circuit and 3D printer

Abstract

The utility model provides a power supply circuit and a 3D printer. The power supply circuit comprises a voltage detection circuit, a switch control circuit and a plurality of load circuits. The voltage detection circuit is used for outputting a corresponding voltage detection signal according to the magnitude of the power supply voltage. The controlled end of the switch control circuit is electrically connected with the output end of the voltage detection circuit, and the input end of the switch control circuit is used for accessing power supply voltage; the switch control circuit is used for conducting one transmission channel in the plurality of transmission channels based on the voltage detection signal. The input ends of the plurality of load circuits are electrically connected with the plurality of output ends of the switch control circuit in a one-to-one correspondence manner, and the output ends of the plurality of load circuits are electrically connected with the function module; and the resistance values of the multiple load circuits are different from one another, so that the functional module has the same working power under the condition that different power supply voltages are accessed, and the stability of the 3D printer is improved.

Description

Technical Field

[0001] This application relates to the field of 3D printing, and more particularly to a power supply circuit and a 3D printer. Background Technology

[0002] Due to differences in power supply voltage across different regions, the efficiency of electronic devices varies significantly when operating under different voltage levels. For example, when a printer is powered by 110VAC, the heating power of the printer's heated bed is only one-quarter of that when powered by 220VAC, resulting in a longer heating time for the printer's heated bed under 110VAC power. Utility Model Content

[0003] To address the problems in the prior art, this application provides a power supply circuit and a 3D printer to improve the stability of the 3D printer.

[0004] This application provides a power supply circuit for supplying power to the functional modules of a 3D printer. The power supply circuit includes a voltage detection circuit, a switch control circuit, and multiple load circuits. The voltage detection circuit is connected to the switch control circuit.

[0005] The voltage detection circuit is connected to the power supply voltage; the voltage detection circuit is used to output a corresponding voltage detection signal according to the magnitude of the power supply voltage.

[0006] The switch control circuit includes a controlled terminal and multiple transmission channels consisting of an input terminal and multiple output terminals; the switch control circuit is used to turn on one of the multiple transmission channels based on the voltage detection signal; the input terminal of the switch control circuit is used to connect to the power supply voltage;

[0007] The plurality of load circuits are electrically connected one-to-one with the plurality of output terminals of the switch control circuit, and the output terminals of the plurality of load circuits are all electrically connected to the functional module; the resistance values ​​of the plurality of load circuits are different from each other, so that the functional module has the same operating power when connected to different power supply voltages.

[0008] In one embodiment, the switch control circuit includes a first switch circuit, a first switch assembly, and a second switch assembly;

[0009] The first switching circuit has an input terminal, a first output terminal, and a second output terminal; the power supply circuit includes a first load circuit and a second load circuit.

[0010] The input terminal of the first switching circuit is electrically connected to the output terminal of the voltage detection circuit. The first output terminal of the first switching circuit is electrically connected to the controlled terminal of the first switching assembly. The second output terminal of the first switching circuit is electrically connected to the controlled terminal of the second switching assembly. The input terminals of the first and second switching assemblies are both used to connect to the power supply voltage. The output terminal of the first switching assembly is electrically connected to the input terminal of the first load circuit. The output terminal of the second switching assembly is electrically connected to the input terminal of the second load circuit.

[0011] The first switching circuit is used to connect the input terminal to the first output terminal or the second output terminal based on the control of the voltage detection signal, and to transmit the voltage detection signal to the first switching component or the second switching component; the voltage detection signal is also used to control the first switching component or the second switching component to be turned on.

[0012] In one embodiment, the number of voltage detection circuits is multiple, and the number of switch control circuits is the same as the number of voltage detection circuits;

[0013] The input terminals of the multiple voltage detection circuits are all used to connect to the power supply voltage, and the number of the multiple voltage detection circuits corresponds one-to-one with the input terminals of the multiple switch control circuits.

[0014] The voltage detection circuit is used to output a first voltage detection signal when the power supply voltage is greater than or equal to a first preset voltage; and to output a second voltage detection signal when the power supply voltage is less than the first preset voltage; the first preset voltages of the plurality of voltage detection circuits are different from each other;

[0015] The first voltage detection signal is used to control the input terminal of the first switching circuit to be electrically connected to the first output terminal of the first switching circuit; the first voltage detection signal is also used to control the first switching component to be turned on.

[0016] The second voltage detection signal is used to control the input terminal of the first switching circuit to be electrically connected to the second output terminal of the first switching circuit; the second voltage detection signal is also used to control the second switching component to be turned on.

[0017] In one embodiment, the first switching circuit includes an analog switch chip or a relay.

[0018] In one embodiment, the second switching component includes a silicon controlled rectifier (SCR) or a transistor.

[0019] In one embodiment, the voltage detection circuit includes a voltage divider circuit, a third switching assembly, and a first optocoupler;

[0020] The first terminal of the voltage divider circuit is used to connect to the power supply voltage, and the second terminal of the voltage divider circuit is electrically connected to the first terminal of the third switching assembly; the voltage divider circuit is used to divide the power supply voltage and output the divided power supply voltage.

[0021] The first end of the first optocoupler is electrically connected to the input end of the voltage divider circuit, the second end of the first optocoupler is electrically connected to the second end of the third switch assembly, the third end of the first optocoupler is used to connect to the power supply voltage, and the fourth end of the first optocoupler is grounded; the third end of the first optocoupler is also electrically connected to the controlled end of the switch control circuit; the third end of the third switch assembly is grounded.

[0022] The third switching component is used to turn on when the power supply voltage after voltage division is greater than or equal to the first preset voltage.

[0023] In one embodiment, the voltage detection circuit further includes a first rectifier circuit;

[0024] The first terminal of the first rectifier circuit is used to connect to the power supply voltage, and the second terminal of the first rectifier circuit is electrically connected to the first terminal of the voltage divider circuit.

[0025] In one embodiment, the power supply circuit further includes:

[0026] A first current detection circuit is used to detect the current of the functional module and output a first current detection signal.

[0027] A first comparator has its first input terminal electrically connected to the first current detection circuit for receiving the first current detection signal, and its second input terminal for connecting to a first reference voltage. The first comparator outputs a first protection signal when the voltage at its first input terminal is greater than or equal to the first reference voltage.

[0028] A first control circuit is electrically connected to the output of the first comparator and the switch control circuit, respectively. The first control circuit is used to control the input of the switch control circuit to disconnect from each output when it receives the first protection signal.

[0029] In one embodiment, the power supply circuit further includes:

[0030] The second current detection circuit is used to detect the current of the functional module and output a second current detection signal.

[0031] The second comparator has its first input terminal electrically connected to the second current detection circuit for receiving the second current detection signal, and its second input terminal for connecting to a second reference voltage. The second comparator outputs a second protection signal when the voltage at the first input terminal is greater than or equal to the second reference voltage.

[0032] The second control circuit is electrically connected to the output of the second comparator and the switch control circuit, respectively. The second control circuit is used to control the input of the switch control circuit to disconnect from each output when it receives the second protection signal.

[0033] This application also proposes a 3D printer, which includes the power supply circuit described above; the power supply circuit has multiple output terminals, and each output terminal of the power supply circuit is used to output a power supply voltage.

[0034] This application uses a voltage detection circuit to detect the magnitude of the power supply voltage and outputs a corresponding detected voltage to control the switch control circuit to connect the input terminal to the corresponding output terminal, thereby connecting the load circuit that matches the power supply voltage. In this way, the working power of the functional modules can be the same under different power supply voltages, thereby improving the stability of the 3D printer. Attached Figure Description

[0035] Figure 1 This is a structural diagram of a power supply circuit according to an embodiment of this application.

[0036] Figure 2 This is a structural diagram of a power supply circuit according to an embodiment of this application.

[0037] Figure 3 This is a structural diagram of a voltage detection circuit according to an embodiment of this application.

[0038] Figure 4 This is a structural diagram of a first switching circuit according to an embodiment of this application.

[0039] Figure 5 This is a structural diagram of a first switching circuit according to another embodiment of this application.

[0040] Figure 6 This is a structural diagram of a first switch assembly according to an embodiment of this application.

[0041] Figure 7 This is a structural diagram of a reference level emitter follower circuit according to an embodiment of this application.

[0042] Figure 8 This is a structural diagram of a 3D printer according to an embodiment of this application.

[0043] Explanation of main component symbols

[0044] Power supply circuit 100

[0045] Voltage detection circuit 110

[0046] Switch control circuit 120

[0047] Load circuit 130

[0048] Voltage divider circuit 111

[0049] Third switch assembly 112

[0050] First optical coupler 113

[0051] First switching circuit 121

[0052] First switch assembly 122

[0053] Second switch assembly 123

[0054] First load circuit 131

[0055] Second load circuit 132

[0056] First rectifier circuit 114

[0057] First current detection circuit 140

[0058] First comparator 150

[0059] First control circuit 160

[0060] Second current detection circuit 170

[0061] Second comparator 180

[0062] Second control circuit 190

[0063] 3D printer 10

[0064] First resistor R1

[0065] Second resistor R2

[0066] First amplifier circuit 201

[0067] Second rectifier circuit 202

[0068] Second amplifier circuit 203

[0069] Third rectifier circuit 204

[0070] Thyristor Q1

[0071] Second optical coupler 122a

[0072] heated bed assembly 200

[0073] Functional Module 300

[0074] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0075] The following description will refer to the accompanying drawings to provide a more complete picture of the present application. The drawings illustrate exemplary embodiments of the present application. However, the present application may be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals denote the same or similar components.

[0076] The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to limit the application. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are intended to also include the plural forms. Furthermore, when used herein, “comprising” and / or “including” and / or “having,” integers, steps, operations, components, and / or components, but does not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components, and / or groups thereof.

[0077] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Furthermore, unless expressly defined herein, terms such as those defined in a general dictionary should be interpreted as having the same meaning as they have in the relevant art and in the content of this application, and will not be interpreted as having an idealized or overly formal meaning.

[0078] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments. It should be noted that components depicted in the drawings are not necessarily shown to scale; and identical or similar components will be designated with the same or similar reference numerals or similar technical terms.

[0079] Reference Figure 1This application proposes a power supply circuit 100, which includes a voltage detection circuit 110, a switch control circuit 120, and multiple load circuits 130. The power supply circuit 100 supplies power to the functional modules 300 of a 3D printer 10. The input terminal of the voltage detection circuit 110 is used to connect to a power supply voltage; the voltage detection circuit 110 outputs a corresponding voltage detection signal based on the magnitude of the power supply voltage. The switch control circuit 120 includes a controlled terminal and multiple transmission channels composed of an input terminal and multiple output terminals; the controlled terminal of the switch control circuit 120 is electrically connected to the output terminal of the voltage detection circuit 110, and the input terminal of the switch control circuit 120 is used to connect to the power supply voltage; the switch control circuit 120 is used to turn on one of the multiple transmission channels based on the voltage detection signal. The input terminals of the multiple load circuits 130 are electrically connected to the multiple output terminals of the switch control circuit 120 in a one-to-one correspondence, and the output terminals of the multiple load circuits 130 are all electrically connected to the functional module 300; the resistance values ​​of the multiple load circuits 130 are different from each other, so that the functional module 300 has the same operating power when connected to different power supply voltages.

[0080] In this embodiment, the voltage detection circuit 110 can detect the input power supply voltage and output a corresponding voltage detection signal according to the magnitude of the power supply voltage. The voltage detection signal can control the switch control circuit 120 to turn on one of the multiple transmission channels, so as to transmit the power supply voltage to the corresponding load circuit 130. The load circuit 130 can be implemented using resistors, coils, etc., and the resistance value of the load circuit 130 can be set to different resistance values ​​according to different power supply voltages, so that the power output from each load circuit 130 to the functional module 800 is consistent.

[0081] For example, refer to Figure 2 The power supply circuit 100 includes a first load circuit 131 and a second load circuit 132. The first load circuit 131 includes a first coil, which is connected to the first output terminal of the switch control circuit 120 and the functional module 800, respectively. The second load circuit 132 includes a second coil, which is connected to the second output terminal of the switch control circuit 120 and the functional module 800, respectively. Alternatively, the first load circuit 131 may also include a first resistor R1. The second load circuit 131 may also include a second resistor R2.

[0082] When the voltage detection circuit 110 detects a power supply voltage of 110V, it outputs a voltage detection signal with a first voltage value. This voltage detection signal controls the input terminal and the first output terminal of the switch control circuit 120 to conduct, transmitting the power supply voltage to the first load circuit 131. When the voltage detection circuit 110 detects a power supply voltage of 220V, it outputs a voltage detection signal with a second voltage value. This voltage detection signal controls the input terminal and the second output terminal of the switch control circuit 120 to conduct, transmitting the power supply voltage to the second load circuit 132. When the power supply voltage is 380V, the voltage detection circuit 110 outputs a voltage detection signal with a third voltage value. This voltage detection signal controls the input terminal and the third output terminal of the switch control circuit 120 to conduct, transmitting the power supply voltage to the third load circuit 130. The resistance values ​​of the first load circuit 131, the second load circuit 132, and the third load circuit 130 can be set according to the formula P = (U^2) / R, where P is the load power, U is the power supply voltage, and R is the resistance value of the load circuit 130. Under constant power conditions, the resistance of the load circuit 130 is inversely proportional to the square of the power supply voltage. Thus, the switch control circuit 120 can connect the input terminal to the corresponding output terminal according to different power supply voltages, thereby outputting the power supply voltage to the matched load circuit 130, so that the operating power of the functional module 300 can remain stable.

[0083] The power supply circuit 100 of this embodiment can be applied to various electronic devices, such as mobile devices like computers and mobile phones, household appliances like robot vacuums, fans, and garment steamers, and industrial equipment like 3D printers 10 and grinding machines. Taking 3D printer 10 as an example, 3D printer 10 has a wide range of applications and may be used in different countries and regions. Power supply voltages differ in different countries and regions, and 3D printers 10 of the same model may be connected to different power supply voltages. The voltage detection circuit 110 can detect the magnitude of the power supply voltage and output a corresponding voltage detection signal. The switch control circuit 120 can connect the input terminal to the corresponding output terminal according to the voltage detection signal, that is, connect the power supply voltage to a load circuit 130 with a matched resistance. The output terminal of the load circuit 130 can be electrically connected to the functional module 300 in the 3D printer 10. In this way, the appropriate load circuit 130 can be switched according to the power supply voltage, so that the functional module 300 can achieve the same operating power when connected to different power supply voltages.

[0084] In addition, the power supply circuit 100 can also be applied to various functional modules 300 such as drive circuits, power supply circuits, and heated bed assembly 200. For example, the 3D printer 10 also includes a heated bed assembly 200, which may include the power supply circuit 100 and a heating circuit. The voltage detection circuit 110 detects the power supply voltage and outputs a voltage detection signal to control the switch control circuit 120 to transmit the power supply voltage to the matching load circuit 130. The output terminal of the load circuit 130 is electrically connected to the heating circuit. In this way, the heated bed assembly 200 can switch the corresponding load circuit 130 to be connected according to different power supply voltages, so that the heating circuit can achieve the same amount of working power under different power supply voltages.

[0085] This application uses a voltage detection circuit 110 to detect the magnitude of the power supply voltage and outputs a corresponding detection voltage to control the switch control circuit 120 to connect the input terminal to the corresponding output terminal, thereby connecting the load circuit 130 that matches the power supply voltage. In this way, the working power of the functional module 300 can be the same under different power supply voltages, thereby improving the stability of the 3D printer 10.

[0086] Reference Figure 3 In one embodiment, the voltage detection circuit 110 includes a voltage divider circuit 111, a third switching component 112, and a first optocoupler 113. The input terminal of the voltage divider circuit 111 is used to connect to a power supply voltage, and the output terminal of the voltage divider circuit 111 is electrically connected to the first terminal of the third switching component 112. The voltage divider circuit 111 is used to divide the power supply voltage and output the divided power supply voltage. The first terminal of the first optocoupler 113 is electrically connected to the input terminal of the voltage divider circuit 111, the second terminal of the first optocoupler 113 is electrically connected to the second terminal of the third switching component 112, the third terminal of the first optocoupler 113 is used to connect to the power supply voltage, and the fourth terminal of the first optocoupler 113 is grounded. The third terminal of the first optocoupler 113 is also electrically connected to the controlled terminal of the switch control circuit 120. The third terminal of the third switching component 112 is grounded. The third switching component 112 is used to conduct when the divided power supply voltage is greater than or equal to a first preset voltage.

[0087] In this embodiment, the voltage divider circuit 111 can be implemented using resistors. For example, the voltage divider circuit 111 includes a first resistor R1 and a second resistor R2. The first terminal of the first resistor R1 is connected to the power supply voltage, and the power supply voltage is output to the first terminal of the third switching component 112 after being divided by the first resistor R1 and the second resistor R2. If the divided power supply voltage is greater than a first preset voltage, the third switching component 112 is turned on, connecting the second terminal of the first optocoupler 113 to ground, that is, connecting the first and second terminals of the first optocoupler 113, and then connecting the third and fourth terminals of the first optocoupler 113. Thus, the voltage detection signal output from the third terminal of the first optocoupler 113 is low. The switch control circuit 120 can connect the input terminal to the first output terminal according to this low level, so as to connect the first load circuit 131.

[0088] Similarly, if the voltage after voltage division is less than the first preset voltage, the third switch assembly 112 is disconnected, meaning that the first and second terminals of the first optocoupler 113 are not connected, and the third and fourth terminals of the first optocoupler 113 are also not connected. Thus, the voltage detection signal output from the third terminal of the first optocoupler 113 is high. The switch control circuit 120 can connect its input terminal to the second output terminal based on this high level, thereby connecting the second load circuit 132.

[0089] The third switching component 112 can be implemented using a TL431 voltage regulator, a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor), or other similar devices.

[0090] In one embodiment, the switch control circuit 120 includes a first switch circuit 121, a first switch assembly 122, and a second switch assembly 123. The first switch circuit 121 has an input terminal, a first output terminal, and a second output terminal. The input terminal of the first switch circuit 121 is electrically connected to the output terminal of the voltage detection circuit 110. The first output terminal of the first switch circuit 121 is electrically connected to the controlled terminal of the first switch assembly 122. The second output terminal of the first switch circuit 121 is electrically connected to the controlled terminal of the second switch assembly 123. Both the input terminals of the first switch assembly 122 and the second switch assembly 123 are used to connect to the power supply voltage. The output terminal of the first switch assembly 122 is electrically connected to the input terminal of the first load circuit 131, and the output terminal of the second switch assembly 123 is electrically connected to the input terminal of the second load circuit 132. The first switching circuit 121 is used to connect the input terminal to the first output terminal or the second output terminal based on the control of the voltage detection signal, and to transmit the voltage detection signal to the first switching component 122 or the second switching component 123; the voltage detection signal is also used to control the first switching component 122 or the second switching component 123 to be turned on.

[0091] In this embodiment, the first switching circuit 121 can connect its input terminal to the first output terminal or the second output terminal based on the control of the voltage detection signal, so as to transmit the voltage detection signal to the first switching component 122 or the second switching component 123. The voltage detection signal controls the first switching component 122 or the second switching component 123 to conduct, thereby connecting the first load circuit 131 or the second load circuit 132 that matches the power supply voltage.

[0092] The first switching circuit 121 can be selected from analog switching chips (such as...). Figure 4 (as shown) or relay (such as) Figure 5 (As shown). For example, the first switching circuit 121 uses an analog switch chip, which can switch the input pin to be connected to one of the multiple output pins, or not connected to any of the multiple output pins, based on the voltage at the input terminal. The first switching circuit 121 uses a single-pole double-throw relay, and the voltage detection signal can control the contact action of the single-pole double-throw relay to connect the input terminal to the first output terminal or the second output terminal.

[0093] The first switching assembly 122 and the second switching assembly 123 can be implemented using a thyristor Q1 or a transistor. For example, refer to... Figure 6The first switching assembly 122 includes a silicon controlled rectifier (SCR) Q1. The input terminal of SCR Q1 is used to connect to a power supply voltage, and the output terminal of SCR Q1 is connected to a first load circuit 131. The controlled terminal of SCR Q1 is used to receive a voltage detection signal. When the voltage detection signal is high, SCR Q1 conducts, transmitting the power supply voltage to the first load circuit 131. Further, the first switching assembly 122 may also include a second optocoupler 122a. The input terminal of the second optocoupler 122a is connected to the output terminal of the first switching circuit 121, and the output terminal of the second optocoupler 122a is connected to the SCR Q1. Thus, the voltage detection signal can control the conduction / disconnection of the SCR Q1 through the second optocoupler 122a, achieving electrical isolation and protecting the circuits on both sides.

[0094] In one embodiment, there are multiple voltage detection circuits 110, and the number of switch control circuits 120 is the same as the number of voltage detection circuits 110. The input terminals of each voltage detection circuit 110 are used to connect to a power supply voltage, and the number of voltage detection circuits 110 corresponds one-to-one with the input terminals of the multiple switch control circuits 120. Each voltage detection circuit 110 outputs a first voltage detection signal when the power supply voltage is greater than or equal to a first preset voltage, and outputs a second voltage detection signal when the power supply voltage is less than the first preset voltage; the first preset voltages of the multiple voltage detection circuits 110 are different from each other. The first voltage detection signal is used to control the input terminal of the first switch circuit 121 to be electrically connected to the first output terminal of the first switch circuit 121; the first voltage detection signal is also used to control the first switch assembly 122 to be turned on. The second voltage detection signal is used to control the input terminal of the first switch circuit 121 to be electrically connected to the second output terminal of the first switch circuit 121; the second voltage detection signal is also used to control the second switch assembly 123 to be turned on.

[0095] In this embodiment, the number of voltage detection circuits 110 can be set according to the actual application. For example, the number of voltage detection circuits 110 can be set to two, namely a first voltage detection circuit 110 and a second voltage detection circuit 110. The number of switch control circuits 120 is two, namely a first switch control circuit 120 and a second switch control circuit 120.

[0096] When the first voltage detection circuit 110 detects a power supply voltage of 110V, it outputs a low-level voltage detection signal, controlling the connection between the input and output terminals of the first switch circuit 121 in the first switch control circuit 120, thereby turning on the first switch assembly 122 and transmitting the 110V power supply voltage to the first load circuit 131. When the first voltage detection circuit 110 detects a power supply voltage of 220V, it outputs a high-level voltage detection signal, controlling the connection between the input and output terminals of the first switch circuit 121 in the first switch control circuit 120, thereby turning on the second switch assembly 123 and transmitting the 220V power supply voltage to the second load circuit 132.

[0097] When the second voltage detection circuit 110 detects a power supply voltage of 380V, it outputs a low-level voltage detection signal, controlling the connection between the input and first output terminals of the first switch circuit 121 in the second switch control circuit 120, thereby turning on the first switch assembly 122 and transmitting the 380V power supply voltage to the first load circuit 131. When the second voltage detection circuit 110 detects a power supply voltage of 460V, it outputs a high-level voltage detection signal, controlling the connection between the input and second output terminals of the first switch circuit 121 in the second switch control circuit 120, thereby turning on the second switch assembly 123 and transmitting the 460V power supply voltage to the second load circuit 132.

[0098] The first preset voltage of the voltage detection circuit 110 can be determined according to the voltage to be detected. The first preset voltage of the first voltage detection circuit 110 can be determined based on 110V and 220V voltage, so that when the power supply voltage is 110V, the power supply voltage after voltage division by the voltage divider circuit 111 is less than the first preset voltage; when the power supply voltage is 220V, the power supply voltage after voltage division by the voltage divider circuit 111 is greater than or equal to the first preset voltage.

[0099] In one embodiment, the voltage detection circuit 110 further includes a first rectifier circuit 114. The input terminal of the first rectifier circuit 114 is used to connect to the power supply voltage, and the output terminal of the first rectifier circuit 114 is electrically connected to the input terminal of the voltage divider circuit 111.

[0100] In this embodiment, the power supply voltage can be an AC power supply voltage. The first rectifier circuit 114 can convert the AC power supply voltage into a DC power supply voltage and output it to the voltage detection circuit 110 for detection. The first rectifier circuit 114 can be implemented using four diodes or a rectifier chip (such as MB6S).

[0101] In one embodiment, the power supply circuit 100 further includes a first current detection circuit 140, a first comparator 150, and a first control circuit 160. The first current detection circuit 140 detects the current of the functional module 300 and outputs a first current detection signal. The first input terminal of the first comparator 150 is electrically connected to the first current detection circuit 140, and the second input terminal of the first comparator 150 is used to connect to a first reference voltage. When the voltage at the first input terminal is greater than or equal to the first reference voltage, the first comparator 150 outputs a first protection signal. The first control circuit 160 is electrically connected to the output terminal of the first comparator 150 and the switch control circuit 120, respectively. Upon receiving the first protection signal, the first control circuit 160 controls the input terminal of the switch control circuit 120 to disconnect from each output terminal.

[0102] In this embodiment, the first control circuit 160 can be implemented using chips with control functions, such as microprocessors or FPGAs (Field Programmable Gate Arrays). The first control circuit 160 can also be a control circuit within functional modules 300 such as the heated bed assembly 200, the mainboard circuit, and the drive circuit. The first reference voltage can be obtained through a reference level emitter follower circuit (such as...). Figure 7 (As shown) or generated by voltage divider circuit 111.

[0103] The first current detection circuit 140 can be implemented using a current transformer. A current transformer converts a large primary current into a small secondary current. The current transformer consists of an iron core and a coil. When detecting leakage current, the live and neutral wires of the functional module 300 are simultaneously routed through the magnetic core. If leakage occurs in the circuit, a current difference will be generated between the live and neutral wires, inducing a current in the secondary coil. The first input terminal of the first comparator 150 can acquire the voltage of the secondary coil of the current transformer and compare it with a first reference voltage. The first reference voltage can be set to an appropriate value according to the actual application. If the voltage at the first input terminal of the first comparator 150 is greater than the first reference voltage, the comparator outputs a high level, indicating leakage in the circuit. The first control circuit 160 then controls the switch control circuit 120 to completely disconnect, preventing leakage current from damaging subsequent circuits. Alternatively, the first current detection circuit 140 can also be implemented using a detection resistor, a current detection chip, etc.

[0104] In one embodiment, the power supply circuit 100 further includes a second rectifier circuit 202. The input terminal of the second rectifier circuit 202 is used to connect to the power supply voltage, and the output terminal of the second rectifier circuit 202 is connected to the input terminal of the first current detection circuit 140. The second rectifier circuit 202 can convert the AC power supply voltage into a DC power supply voltage and output it to the first current detection circuit 140 for detection. The second rectifier circuit 202 can be implemented using four diodes or a rectifier chip (e.g., MB6S).

[0105] In one embodiment, the power supply circuit 100 further includes a first amplifier circuit 201. The first amplifier circuit 201 is connected between the first current detection circuit 140 and the first comparator 150 to amplify the signal output by the first current detection circuit 140, so that the first input terminal of the first comparator 150 can acquire a more accurate electrical signal.

[0106] In one embodiment, the power supply circuit 100 further includes a second current detection circuit 170, a second comparator 180, and a second control circuit 190. The second current detection circuit 170 detects the current of the functional module 300 and outputs a second current detection signal. The first input terminal of the second comparator 180 is electrically connected to the second current detection circuit 170, and the second input terminal of the second comparator 180 is used to connect to a second reference voltage. The second comparator 180 outputs a second protection signal when the voltage at its first input terminal is greater than or equal to the second reference voltage. The second control circuit 190 is electrically connected to the output terminal of the second comparator 180 and the switch control circuit 120, respectively. The second control circuit 190 controls the input terminal of the switch control circuit 120 to disconnect from each output terminal when it receives the second protection signal.

[0107] In this embodiment, the second control circuit 190 can be implemented using chips with control functions, such as microprocessors or FPGAs (Field Programmable Gate Arrays). The second control circuit 190 can also be a control circuit within functional modules 300 such as the heated bed assembly 200, the mainboard circuit, and the drive circuit. The second reference voltage can be achieved through a reference level emitter follower circuit (such as...). Figure 5 (As shown) or generated by voltage divider circuit 111.

[0108] The second current detection circuit 170 can be implemented using a current transformer or a Hall sensor. The current transformer converts a large primary current into a small secondary current. The current transformer consists of an iron core and a coil; when detecting short-circuit current, the live wire passes through the core. If a short circuit occurs in the circuit, a current change will occur on the live wire, inducing a current in the secondary coil. The first input terminal of the second comparator 180 can acquire the voltage of the secondary coil of the current transformer and compare it with a second reference voltage. The second reference voltage can be set to an appropriate value according to the actual application. If the voltage at the first input terminal of the second comparator 180 is greater than the second reference voltage, the comparator outputs a high level, indicating a short circuit in the circuit. The second control circuit 190 then controls the switch control circuit 120 to completely disconnect, preventing the short-circuit current from damaging subsequent circuits. The second control circuit 190 can also output fault indication information to prompt the user to troubleshoot and repair the fault in a timely manner. The second control circuit 190 can be integrated into the first control circuit 160. Alternatively, the second current detection circuit 170 can also be implemented using a detection resistor, a current detection chip, etc.

[0109] In one embodiment, the power supply circuit 100 further includes a third rectifier circuit 204. The input terminal of the third rectifier circuit 204 is used to connect to the power supply voltage, and the output terminal of the third rectifier circuit 204 is connected to the input terminal of the second current detection circuit 170. The third rectifier circuit 204 can convert the AC power supply voltage into a DC power supply voltage and output it to the second current detection circuit 170 for detection. The third rectifier circuit 204 can be implemented using four diodes or a rectifier chip (e.g., MB6S).

[0110] In one embodiment, the power supply circuit 100 further includes a second amplifier circuit 203. The second amplifier circuit 203 is connected between the second current detection circuit 170 and the second comparator 180, and amplifies the signal output by the second current detection circuit 170 so that the second input terminal of the second comparator 180 can acquire a more accurate electrical signal.

[0111] Reference Figure 8 This application also proposes a 3D printer 10, which includes the power supply circuit 100 described above; the power supply circuit 100 has multiple output terminals, and each output terminal of the power supply circuit 100 is used to output a power supply voltage.

[0112] The detailed structure of the power supply circuit 100 can be referred to the above embodiments, and will not be repeated here. It is understood that since the above power supply circuit 100 is used in the 3D printer 10 of this application, the embodiments of the 3D printer 10 of this application include all the technical solutions of all embodiments of the above power supply circuit 100, and the technical effects achieved are exactly the same, and will not be repeated here.

[0113] The specific embodiments of this application have been described above with reference to the accompanying drawings. However, those skilled in the art will understand that various changes and substitutions can be made to the specific embodiments of this application without departing from the spirit and scope of this application. All such changes and substitutions fall within the scope defined by this application.

Claims

1. A power supply circuit for supplying power to functional modules of a 3D printer, characterized in that, The power supply circuit includes a voltage detection circuit, a switch control circuit, and multiple load circuits; the voltage detection circuit is connected to the switch control circuit. The voltage detection circuit is connected to the power supply voltage; the voltage detection circuit is used to output a corresponding voltage detection signal according to the magnitude of the power supply voltage. The switch control circuit includes a controlled terminal and multiple transmission channels consisting of an input terminal and multiple output terminals; The switch control circuit is used to turn on one of the multiple transmission channels based on the voltage detection signal. The input terminal of the switch control circuit is used to connect to the power supply voltage; The plurality of load circuits are electrically connected one-to-one with the plurality of output terminals of the switch control circuit, and the output terminals of the plurality of load circuits are all electrically connected to the functional module; the resistance values ​​of the plurality of load circuits are different from each other, so that the functional module has the same operating power when connected to different power supply voltages.

2. The power supply circuit as described in claim 1, characterized in that, The switch control circuit includes a first switch circuit, a first switch assembly, and a second switch assembly; The first switching circuit has an input terminal, a first output terminal, and a second output terminal; the power supply circuit includes a first load circuit and a second load circuit. The input terminal of the first switching circuit is electrically connected to the output terminal of the voltage detection circuit. The first output terminal of the first switching circuit is electrically connected to the controlled terminal of the first switching assembly. The second output terminal of the first switching circuit is electrically connected to the controlled terminal of the second switching assembly. The input terminals of the first and second switching assemblies are both used to connect to the power supply voltage. The output terminal of the first switching assembly is electrically connected to the input terminal of the first load circuit. The output terminal of the second switching assembly is electrically connected to the input terminal of the second load circuit. The first switching circuit is used to connect the input terminal to the first output terminal or the second output terminal based on the control of the voltage detection signal, and to transmit the voltage detection signal to the first switching component or the second switching component; the voltage detection signal is also used to control the first switching component or the second switching component to be turned on.

3. The power supply circuit as described in claim 2, characterized in that, The number of voltage detection circuits is multiple, and the number of switch control circuits is the same as the number of voltage detection circuits; Each of the voltage detection circuits is connected to a power supply voltage, and the number of the voltage detection circuits corresponds one-to-one with the input terminals of the switch control circuits. The voltage detection circuit is used to output a first voltage detection signal when the power supply voltage is greater than or equal to a first preset voltage; and to output a second voltage detection signal when the power supply voltage is less than the first preset voltage. The first preset voltages of the multiple voltage detection circuits are different from each other; The first voltage detection signal is used to control the input terminal of the first switching circuit to be electrically connected to the first output terminal of the first switching circuit; the first voltage detection signal is also used to control the first switching assembly to be turned on. The second voltage detection signal is used to control the input terminal of the first switching circuit to be electrically connected to the second output terminal of the first switching circuit; the second voltage detection signal is also used to control the second switching component to be turned on.

4. The power supply circuit as described in claim 2, characterized in that, The first switching circuit includes an analog switch chip or a relay.

5. The power supply circuit as described in claim 2, characterized in that, The second switching assembly includes a silicon controlled rectifier (SCR) or a transistor.

6. The power supply circuit as described in claim 1, characterized in that, The voltage detection circuit includes a voltage divider circuit, a third switching assembly, and a first optocoupler; The first terminal of the voltage divider circuit is used to connect to the power supply voltage, and the second terminal of the voltage divider circuit is electrically connected to the first terminal of the third switching assembly; the voltage divider circuit is used to divide the power supply voltage and output the divided power supply voltage. The first end of the first optocoupler is electrically connected to the input end of the voltage divider circuit, the second end of the first optocoupler is electrically connected to the second end of the third switching assembly, the third end of the first optocoupler is used to connect to the power supply voltage, and the fourth end of the first optocoupler is grounded; the third end of the first optocoupler is also electrically connected to the controlled end of the switch control circuit; the third end of the third switching assembly is grounded. The third switching component is used to turn on when the power supply voltage after voltage division is greater than or equal to the first preset voltage.

7. The power supply circuit as described in claim 6, characterized in that, The voltage detection circuit also includes a first rectifier circuit; The first terminal of the first rectifier circuit is used to connect to the power supply voltage, and the second terminal of the first rectifier circuit is electrically connected to the first terminal of the voltage divider circuit.

8. The power supply circuit as described in claim 1, characterized in that, The power supply circuit also includes: A first current detection circuit is used to detect the current of the functional module and output a first current detection signal. A first comparator has its first input terminal electrically connected to the first current detection circuit for receiving the first current detection signal, and its second input terminal for connecting to a first reference voltage. The first comparator outputs a first protection signal when the voltage at its first input terminal is greater than or equal to the first reference voltage. A first control circuit is electrically connected to the output of the first comparator and the switch control circuit, respectively. The first control circuit is used to control the input of the switch control circuit to disconnect from each output when it receives the first protection signal.

9. The power supply circuit as described in claim 1, characterized in that, The power supply circuit also includes: The second current detection circuit is used to detect the current of the functional module and output a second current detection signal. The second comparator has its first input terminal electrically connected to the second current detection circuit for receiving the second current detection signal, and its second input terminal for connecting to a second reference voltage. The second comparator outputs a second protection signal when the voltage at the first input terminal is greater than or equal to the second reference voltage. The second control circuit is electrically connected to the output of the second comparator and the switch control circuit, respectively. The second control circuit is used to control the input of the switch control circuit to disconnect from each output when it receives the second protection signal.

10. A 3D printer, characterized in that, The 3D printer includes a power supply circuit as described in any one of claims 1 to 9; the power supply circuit has a plurality of output terminals, each of the power supply circuit outputting a power supply voltage.

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