Constant-current constant-voltage source circuit

Abstract

The utility model discloses a constant-current constant-voltage source circuit. Comprising a direct-current power supply, at least two processing modules, an output circuit and a control circuit, a first inverter of the first processing module is used for converting a direct-current voltage output by a direct-current power supply into a first alternating-current voltage, and a first rectifying and filtering circuit is used for converting the first alternating-current voltage into a first direct-current voltage and filtering the first direct-current voltage; the ith inverter of the ith processing module is used for converting the (i-1) th direct current voltage output by the (i-1) th rectifying and filtering circuit into the ith alternating current voltage, and the ith rectifying and filtering circuit is used for converting the ith alternating current voltage into the ith direct current voltage and filtering the ith direct current voltage; the output circuit is used for receiving the ith direct-current voltage and outputting constant voltage or constant current to a load according to the ith direct-current voltage; and the inversion control signal output end of the control circuit is used for transmitting an inversion control signal to the control end of the inverter. According to the utility model, the mode of realizing constant-current and constant-voltage output is high in precision, high in efficiency and less in energy waste, and does not need heat dissipation.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a constant current and constant voltage source circuit. Background Art

[0002] A constant current and constant voltage source is a power supply device that can provide constant current and constant voltage. It is widely used in the electronic control of optical devices and optical chips. Constant current and constant voltage sources achieve constant current and constant voltage output by controlling their output current and voltage.

[0003] Traditional constant-current and constant-voltage power supplies typically use linear regulators to regulate voltage, thereby achieving constant-current and constant-voltage output. Because linear regulators convert excess voltage into heat energy to achieve voltage regulation, they suffer from low precision and efficiency. Furthermore, in high-power applications, linear regulators generate significant heat, resulting in energy waste and the need for heat dissipation. Utility Model Content

[0004] The utility model provides a constant current and constant voltage source circuit to solve the problems of low precision, low efficiency, energy waste and need for heat dissipation in the existing constant current and constant voltage source circuit in achieving constant current and constant voltage output.

[0005] The embodiment of the utility model provides a constant current and constant voltage source circuit, comprising a DC power supply, at least two processing modules, an output circuit and a control circuit;

[0006] At least two of the processing modules include a first processing module and an i-th processing module, wherein i≥2 and i is a positive integer; the first processing module includes a first inverter and a first rectifier and filter circuit; the i-th processing module includes an i-th inverter and an i-th rectifier and filter circuit;

[0007] The input end of the first inverter is electrically connected to the output end of the DC power supply, and the output end is electrically connected to the input end of the first rectifier and filter circuit, and is used to convert the DC voltage output by the DC power supply into a first AC voltage; the first rectifier and filter circuit is used to convert the first AC voltage into a first DC voltage and filter it;

[0008] The input end of the i-th inverter is electrically connected to the output end of the (i-1)th rectifier and filter circuit, and the output end is electrically connected to the input end of the i-th rectifier and filter circuit, and is used to convert the (i-1)th DC voltage output by the (i-1)th rectifier and filter circuit into an i-th AC voltage; the i-th rectifier and filter circuit is used to convert the i-th AC voltage into an i-th DC voltage and filter it;

[0009] The output circuit is electrically connected between the output terminal of the i-th rectifier and filter circuit and the load, and is used to receive the i-th DC voltage and output a constant voltage or a constant current to the load according to the i-th DC voltage;

[0010] The control circuit includes at least two inverter control signal output terminals, which are electrically connected to the control terminal of the inverter and are used to transmit inverter control signals to the control terminal.

[0011] Optionally, the constant current and constant voltage source circuit further includes a pulse width modulation circuit; the at least two inverter control signal output terminals include a first inverter control signal output terminal and an i-th inverter control signal output terminal;

[0012] The pulse width modulation circuit is electrically connected between the first inverter control signal output terminal and the control terminal of the first inverter, and is used to receive the first inverter control signal output by the control circuit and transmit a first pulse width modulation signal to the first inverter according to the first inverter control signal;

[0013] The pulse width modulation circuit is also electrically connected between the i-th inverter control signal output terminal and the control terminal of the i-th inverter, and is used to receive the i-th inverter control signal output by the control circuit and transmit the i-th pulse width modulation signal to the i-th inverter according to the i-th inverter control signal.

[0014] Optionally, the pulse width modulation circuit is integrated with the control circuit.

[0015] Optionally, the first rectifying and filtering circuit includes a first rectifying circuit and a first filtering circuit; the i-th rectifying and filtering circuit includes an i-th rectifying circuit and an i-th filtering circuit;

[0016] The input end of the first rectifier circuit is electrically connected to the output end of the first inverter, and the output end is electrically connected to the input end of the first filter circuit, and is used to convert the first AC voltage into a first DC voltage; the first filter circuit is used to filter the first DC voltage;

[0017] The input end of the i-th rectifier circuit is electrically connected to the output end of the i-th inverter, and the output end is electrically connected to the input end of the i-th filter circuit, for converting the i-th AC voltage into an i-th DC voltage; the i-th filter circuit is used to filter the i-th DC voltage.

[0018] Optionally, the first rectifier circuit includes a single-phase bridge rectifier circuit or a three-phase bridge rectifier circuit;

[0019] The first filtering circuit includes a capacitor filtering circuit or an RC filtering circuit;

[0020] The i-th rectifier circuit includes a single-phase bridge rectifier circuit or a three-phase bridge rectifier circuit;

[0021] The i-th filtering circuit includes a capacitor filtering circuit or an RC filtering circuit.

[0022] Optionally, the operating mode of the constant current and constant voltage source circuit includes a constant voltage mode and a constant current mode;

[0023] The output circuit includes a comparator, a switch, and a voltage-current conversion module; a first input end of the comparator is electrically connected to the output end of the i-th inverter and one end of the switch, respectively, and a second input end of the comparator is electrically connected to the output end of the comparator; the other end of the switch is electrically connected to the input end of the voltage-current conversion module, and the output end of the voltage-current conversion module is electrically connected to the output end of the comparator;

[0024] In the constant voltage mode, the switch is disconnected, and the output end of the comparator is used to output a constant voltage to the load;

[0025] In the constant current mode, the switch is closed, the voltage-current conversion module is used to convert the received DC voltage into a constant current, and the output end of the comparator is used to output the constant current to the load.

[0026] Optionally, the constant current and constant voltage source circuit further includes a host computer;

[0027] The mode setting signal output terminal of the host computer is electrically connected to the mode setting signal receiving terminal of the control circuit, and is used to transmit the mode setting signal to the control circuit;

[0028] The mode control signal output terminal of the control circuit is electrically connected to the control terminal of the switch, and is used to transmit a mode control signal to the switch.

[0029] Optionally, the constant current and constant voltage source circuit further includes a protection circuit;

[0030] The protection circuit includes a fuse and a diode; one end of the fuse is electrically connected to the output end of the output circuit, and the other end is electrically connected to the anode of the diode; the cathode of the diode is electrically connected to the load.

[0031] Optionally, the constant current and constant voltage source circuit further includes a current acquisition circuit;

[0032] The current acquisition circuit is connected between the load and the current signal receiving end of the control circuit, and is used to acquire the current signal of the load and transmit the current signal to the control circuit.

[0033] Optionally, the constant current and constant voltage source circuit further includes a voltage acquisition circuit;

[0034] The voltage acquisition circuit is connected between the load and the voltage signal receiving end of the control circuit, and is used to acquire the voltage signal of the load and transmit the voltage signal to the control circuit.

[0035] The technical solution of the embodiment of the utility model increases control nodes by setting multiple processing modules including inverters and rectifier filter circuits between the DC power supply and the output circuit, and setting control circuits to be electrically connected to the control ends of multiple inverters respectively. The constant current and constant voltage output of the constant current and constant voltage power supply circuit can be achieved through multi-level control, thereby solving the problems of low precision, low efficiency, energy waste and the need for heat dissipation in the technical solution of achieving constant current and constant voltage output by setting a linear voltage regulator.

[0036] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A structural diagram of a constant current and constant voltage source circuit provided by an embodiment of the present utility model;

[0039] Figure 2 A circuit diagram of a constant current and constant voltage source circuit provided by an embodiment of the present utility model;

[0040] Figure 3 A circuit diagram of an inverter provided in an embodiment of the present utility model;

[0041] Figure 4 A circuit diagram of a rectifier and filter circuit provided in an embodiment of the present utility model;

[0042] Figure 5 A circuit diagram of another constant current and constant voltage source circuit provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0043] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] Figure 1 This is a structural diagram of a constant current and constant voltage source circuit provided by an embodiment of the utility model. Figure 2 A circuit diagram of a constant current and constant voltage source circuit provided by an embodiment of the present utility model, referring to Figure 1 and Figure 2The constant current and constant voltage source circuit in the embodiment of the present utility model includes a DC power supply 10, at least two processing modules 20, an output circuit 30, and a control circuit 40. The at least two processing modules 20 include a first processing module 21 and an i-th processing module 2i, where i≥2 and i is a positive integer. The first processing module 21 includes a first inverter 211 and a first rectifier and filter circuit 212. The i-th processing module 2i includes an i-th inverter 2i1 and an i-th rectifier and filter circuit 2i2. The input end of the first inverter 211 is electrically connected to the output end of the DC power supply 10, and the output end is electrically connected to the input end of the first rectifier and filter circuit 212, and is used to convert the DC voltage output by the DC power supply 10 into a first AC voltage. The first rectifier and filter circuit 212 is used to convert the first AC voltage into a first DC voltage and filter it. The input terminal of the i-th inverter 2i1 is electrically connected to the output terminal of the (i-1)th rectifier and filter circuit, and the output terminal is electrically connected to the input terminal of the i-th rectifier and filter circuit 2i2, and is configured to convert the (i-1)th DC voltage output by the (i-1)th rectifier and filter circuit into an i-th AC voltage. The i-th rectifier and filter circuit 2i2 is configured to convert the i-th AC voltage into an i-th DC voltage and filter the voltage. The output circuit 30 is electrically connected between the output terminal of the i-th rectifier and filter circuit 2i2 and the load 200, and is configured to receive the i-th DC voltage and output a constant voltage or a constant current to the load 200 based on the i-th DC voltage. The control circuit 40 includes at least two inverter control signal output terminals, each of which is electrically connected to a control terminal of the inverter and configured to transmit an inverter control signal to the control terminal.

[0046] For example, the DC power supply 10 can be a DC voltage source such as a battery or a voltage-stabilized power supply. The DC voltage output by the DC power supply 10 must meet the voltage range required by the load 200. That is, the maximum DC voltage output by the DC power supply 10 must be greater than or equal to the maximum voltage required by the load 200, and the minimum DC voltage output by the DC power supply 10 must be less than or equal to the minimum voltage required by the load 200.

[0047] Figure 3 A circuit diagram of an inverter provided by an embodiment of the present utility model, referring to Figure 3, the voltage input to the input end (two input ports) of the inverter is Vin, where it can be understood that the voltage Vin can be the DC voltage output by the DC power supply 10, or it can be the DC signal output by the rectifying filter circuit in the previous processing module 20. The voltage output by the output end (two output ports) of the inverter is Vout, that is, the voltage across the first load resistor R1. The current output by the inverter is Iout, that is, the current flowing through the first load resistor R2. Specifically, the output port n1 is electrically connected to the common end pair between the first voltage-stabilizing capacitor C1 and the second voltage-stabilizing capacitor C2, and the output port n2 is electrically connected to the common end between the first feedback diode D1 and the second feedback diode D2. The control end of the inverter is the base of the first transistor T1 and the base of the first transistor T2. The inverter control signal output from the inverter control signal output end of the control circuit 40 acts on the first transistor T1 and the first transistor T2, and the output voltage Vout and output current Iout of the inverter can be adjusted by controlling the switching time, frequency and other characteristics of the first transistor T1 and the first transistor T2. As a feasible implementation, the control circuit 30 in the embodiment of the present invention may adopt a common microcontroller (Microcontroller Unit, MCU), such as an STM32F series embedded microcontroller.

[0048] The present embodiment of the utility model utilizes a multi-stage processing module, namely a multi-stage inverter, which can gradually approach the desired output voltage based on the original input voltage. For example, if the output voltage of DC power supply 10 is 10.5V, if a constant voltage of 10V is required, the multi-stage inverter configuration can gradually approach the desired voltage (10.5 → 10.4 → 10.3 → 10.2 → 10.1 → 10). Compared to the technical solution of setting up a processing module to directly jump from 10.5V to 10V, the present utility model is beneficial to the accuracy of constant current and constant voltage output.

[0049] Optionally, if the inverter control signal output by the control circuit 40 cannot be recognized by the inverter, an RS485 communication circuit module can be added between the control circuit 40 and the inverter to convert the inverter control signal output by the control circuit 40 into an inverter control signal that can be recognized by the inverter.

[0050] Figure 4 A circuit diagram of a rectifier and filter circuit provided in an embodiment of the present utility model is shown below. Figure 4A typical single-phase bridge rectifier filter circuit is provided, in which V1 is the input voltage, Tr is the power transformer, and the input voltage V1 can be transformed to obtain the voltage V2. Four rectifier diodes (D3, D4, D5, and D6) form a rectifier bridge, which can rectify the transformed voltage V2 to a DC voltage. C0 is a filter capacitor, which can rectify the rectified DC voltage. R2 is a second load resistor. The voltage across the second load resistor R2 is the output voltage V0, and the current flowing through the load resistor R2 is the output current I0.

[0051] It should be noted that the present invention does not limit the number of processing modules 20, that is, it does not limit the number of inverters and rectifier filter circuits. Those skilled in the art can make a choice based on the requirements of the load 200 for outputting a constant voltage or constant current.

[0052] The load 200 can be an electronic device or device that requires a constant voltage or a constant current to drive. The output circuit 30 receives the DC voltage output by the rectifier filter circuit of the last processing module (the i-th processing module 2i shown in the figure), and outputs a constant voltage or a constant current to the load 200 according to the received DC voltage. Specifically, when the load requires a constant voltage, that is, when the working mode of the constant current and constant voltage source circuit is a constant voltage mode, the output circuit 30 directly outputs the received DC voltage as a constant voltage to the load 200. When the load requires a constant current, that is, when the working mode of the constant current and constant voltage source circuit is a constant current mode, the output circuit 30 first converts the DC voltage into a constant current, and then outputs the constant current to the load 200.

[0053] The technical solution of the embodiment of the present utility model increases the control node by setting multiple processing modules 20 including inverters and rectifier filter circuits between the DC power supply 10 and the output circuit 30, and setting a control circuit 40 electrically connected to the control ends of the multiple inverters respectively. The constant current and constant voltage output of the constant current and constant voltage power supply circuit can be achieved through multi-level control, which solves the problems of low precision, low efficiency, energy waste and the need for heat dissipation in the technical solution of achieving constant current and constant voltage output by setting a linear voltage regulator.

[0054] Figure 5 Another circuit diagram of a constant current and constant voltage source circuit provided by the present invention is shown in FIG. Figure 5The constant current and constant voltage source circuit further includes a pulse width modulation circuit 50. The at least two inverter control signal output terminals include a first inverter control signal output terminal and an i-th inverter control signal output terminal. The pulse width modulation circuit 50 is electrically connected between the first inverter control signal output terminal and the control terminal of the first inverter 211, and is configured to receive the first inverter control signal output by the control circuit 40 and transmit a first pulse width modulation signal to the first inverter 211 based on the first inverter control signal. The pulse width modulation circuit 50 is also electrically connected between the i-th inverter control signal output terminal and the control terminal of the i-th inverter 2i1, and is configured to receive the i-th inverter control signal output by the control circuit 40 and transmit an i-th pulse width modulation signal to the i-th inverter 2i1 based on the i-th inverter control signal.

[0055] Exemplary, reference Figure 2 and Figure 5 The pulse width modulation circuit 50 is generally a microprocessor or a circuit board. The pulse width modulation circuit 50 is connected between the control end of the inverter (the base of the first transistor T1 and the second transistor T2) and the inverter control signal output end of the control circuit 40. It can generate a corresponding pulse width modulation signal according to the inverter control signal output by the control circuit 40, and transmit the pulse width modulation signal to the base of the first transistor T1 and the second transistor T2 in the corresponding inverter to control the switching time, frequency and other characteristics of the first transistor T1 and the second transistor T2, thereby achieving the purpose of adjusting the output voltage and output current of the inverter.

[0056] Continue to refer Figure 5 The pulse width modulation circuit 50 is integrated with the control circuit 40.

[0057] Compared with the technical solution in which the pulse width modulation circuit 50 and the control circuit 40 are arranged separately, the embodiment of the utility model integrates the pulse width modulation circuit 50 and the control circuit 40 together, which is beneficial to simplifying the overall structure of the constant current and constant voltage source.

[0058] For further reference, Figure 2 and Figure 5 The first rectifier and filter circuit 212 includes a first rectifier circuit 2121 and a first filter circuit 2122. The i-th rectifier and filter circuit 2i2 includes an i-th rectifier circuit 2i21 and an i-th filter circuit 2i22. The input of the first rectifier circuit 2121 is electrically connected to the output of the first inverter 211, and the output is electrically connected to the input of the first filter circuit 2122, for converting the first AC voltage into a first DC voltage. The first filter circuit 2122 is configured to filter the first DC voltage. The input of the i-th rectifier circuit 2i21 is electrically connected to the output of the i-th inverter 2i1, and the output is electrically connected to the input of the i-th filter circuit 2i22, for converting the i-th AC voltage into the i-th DC voltage. The i-th filter circuit 2i22 is configured to filter the i-th DC voltage.

[0059] As a feasible embodiment, the first rectifier circuit 2121 includes a single-phase bridge rectifier circuit or a three-phase bridge rectifier circuit. The first filter circuit 2122 includes a capacitor filter circuit or an RC filter circuit. The i-th rectifier circuit 2i21 includes a single-phase bridge rectifier circuit or a three-phase bridge rectifier circuit. The i-th filter circuit 2i22 includes a capacitor filter circuit or an RC filter circuit.

[0060] It should be noted that the embodiments of the present invention do not limit the types of the rectifier circuit and the filter circuit included in the rectifier and filter circuit, and those skilled in the art can set them according to actual needs.

[0061] The working modes of the constant current and constant voltage source circuit in the embodiment of the present utility model include constant voltage mode and constant current mode. Figure 5 The output circuit 30 includes a comparator 31, a switch 32, and a voltage-current conversion module 33. The first input terminal of the comparator 31 is electrically connected to the output terminal of the i-th inverter 2i1 and one end of the switch 32, respectively, and the second input terminal of the comparator 31 is electrically connected to the output terminal of the comparator 31. The other end of the switch 32 is electrically connected to the input terminal of the voltage-current conversion module 33, and the output terminal of the voltage-current conversion module 33 is electrically connected to the output terminal of the comparator 31. In the constant voltage mode, the switch 32 is opened, and the output terminal of the comparator 31 is used to output a constant voltage to the load 200. In the constant current mode, the switch 32 is closed, the voltage-current conversion module 33 is used to convert the received DC voltage into a constant current, and the output terminal of the comparator 31 is used to output the constant current to the load 200.

[0062] Exemplarily, the operating mode of the constant current and constant voltage source circuit can be controlled by controlling the on and off of the switch 32. Specifically, when the switch 32 is disconnected, the DC voltage output by the rectifier and filter circuit of the last processing module (the i-th processing module 2i shown in the figure) will be directly used as the constant voltage and transmitted to the load 200 through the comparator 31. When the switch 32 is closed, the DC voltage output by the rectifier and filter circuit of the last processing module (the i-th processing module 2i shown in the figure) will first be converted into a constant current by the voltage-current conversion module 33, and then the converted constant current will be transmitted to the load 200.

[0063] Optional, reference Figure 5 The constant current and constant voltage source circuit in the embodiment of the present invention further includes a host computer 60. A mode setting signal output terminal of the host computer 60 is electrically connected to a mode setting signal receiving terminal of the control circuit 40 for transmitting a mode setting signal to the control circuit 40. A mode control signal output terminal of the control circuit 40 is electrically connected to a control terminal of the switch 32 for transmitting a mode control signal to the switch 32.

[0064] For example, the user can set the working mode of the constant current and constant voltage source circuit through the host computer 60. The host computer 60 will generate a mode setting signal according to the set working mode, and transmit it to the control circuit 40 through the mode setting signal output end. The control circuit 40 will output the corresponding mode control signal to the control end of the switch 32 according to the received mode setting signal to control the on and off of the switch 32, thereby realizing the control of the working mode of the constant current and constant voltage source circuit.

[0065] The user can also set parameters such as the constant voltage or constant current output by the constant current and constant voltage source circuit through the host computer 60. The host computer 60 will generate an inverter setting signal based on the set parameters and transmit it to the control circuit 40 through the inverter setting signal output end. The control circuit 40 will output the corresponding inverter control signal to the control end of the inverter of each processing module 20 based on the received inverter setting signal to control the output voltage and output current of each inverter, thereby realizing the constant current and constant voltage output of the constant current and constant voltage source circuit.

[0066] Optional, reference Figure 5 The constant current and constant voltage source circuit in the embodiment of the present invention further includes a protection circuit 70. Specifically, referring to the figure, the protection circuit 70 includes a fuse 71 and a diode 72. One end of the fuse 71 is electrically connected to the output end of the output circuit 30, and the other end is electrically connected to the anode of the diode 72. The cathode of the diode 72 is electrically connected to the load 200.

[0067] For example, the fuse 71 can be configured to provide overcurrent protection, overvoltage protection, and short circuit protection, while the diode 72 can be configured to provide overvoltage protection and protect the circuit from reverse voltage and current.

[0068] Optional, reference Figure 5 The constant current and constant voltage source circuit in the embodiment of the present invention further includes a current acquisition circuit 80. The current acquisition circuit 80 is connected between the load 200 and the current signal receiving terminal of the control circuit 40, and is used to acquire the current signal of the load 200 and transmit the current signal to the control circuit 40.

[0069] Exemplarily, the current acquisition circuit 80 can be a simple ammeter or a current detection chip, which can collect and detect the current signal of the load 200 and feed it back to the control circuit 40. The control circuit 40 can adjust the inverter control signal transmitted to the inverter control terminal based on the comparison result of the received current signal with the preset current value, thereby adjusting the operating state of the transistor switch tube in the inverter, so that the current output by the constant current and constant voltage source circuit to the load 200 is constant, thereby achieving constant current output and ensuring the stable operating state of the load 200.

[0070] Based on the above embodiments, Figure 5The constant current and constant voltage source circuit in the embodiment of the present invention further includes a voltage acquisition circuit 90. The voltage acquisition circuit 90 is connected between the load 200 and the voltage signal receiving terminal of the control circuit 40, and is used to acquire the voltage signal of the load 200 and transmit the voltage signal to the control circuit 40.

[0071] Exemplarily, the voltage acquisition circuit 90 can be a simple voltmeter or a voltage detection chip, which can collect and detect the voltage signal of the load 200 and feed it back to the control circuit 40. The control circuit 40 can adjust the inverter control signal transmitted to the inverter control terminal based on the comparison result of the received voltage signal with the preset voltage value, thereby adjusting the operating state of the transistor switch tube in the inverter, so that the voltage output by the constant current and constant voltage source circuit to the load 200 is constant, thereby achieving constant voltage output and ensuring the stable operating state of the load 200.

[0072] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A constant current and constant voltage source circuit, characterized in that: It includes a DC power supply, at least two processing modules, an output circuit and a control circuit; At least two of the processing modules include a first processing module and an i-th processing module, wherein i≥2 and i is a positive integer; the first processing module includes a first inverter and a first rectifier and filter circuit; the i-th processing module includes an i-th inverter and an i-th rectifier and filter circuit; The input end of the first inverter is electrically connected to the output end of the DC power supply, and the output end is electrically connected to the input end of the first rectifier and filter circuit, and is used to convert the DC voltage output by the DC power supply into a first AC voltage; the first rectifier and filter circuit is used to convert the first AC voltage into a first DC voltage and filter it; The input end of the i-th inverter is electrically connected to the output end of the (i-1)th rectifier and filter circuit, and the output end is electrically connected to the input end of the i-th rectifier and filter circuit, and is used to convert the (i-1)th DC voltage output by the (i-1)th rectifier and filter circuit into an i-th AC voltage; the i-th rectifier and filter circuit is used to convert the i-th AC voltage into an i-th DC voltage and filter it; The output circuit is electrically connected between the output terminal of the i-th rectifier and filter circuit and the load, and is used to receive the i-th DC voltage and output a constant voltage or a constant current to the load according to the i-th DC voltage; The control circuit includes at least two inverter control signal output terminals, which are electrically connected to the control terminal of the inverter and are used to transmit inverter control signals to the control terminal.

2. The constant current and constant voltage source circuit according to claim 1, characterized in that: The constant current and constant voltage source circuit further includes a pulse width modulation circuit; the at least two inverter control signal output terminals include a first inverter control signal output terminal and an i-th inverter control signal output terminal; The pulse width modulation circuit is electrically connected between the first inverter control signal output terminal and the control terminal of the first inverter, and is used to receive the first inverter control signal output by the control circuit and transmit a first pulse width modulation signal to the first inverter according to the first inverter control signal; The pulse width modulation circuit is also electrically connected between the i-th inverter control signal output terminal and the control terminal of the i-th inverter, and is used to receive the i-th inverter control signal output by the control circuit and transmit the i-th pulse width modulation signal to the i-th inverter according to the i-th inverter control signal.

3. The constant current and constant voltage source circuit according to claim 2, characterized in that: The pulse width modulation circuit is integrated with the control circuit.

4. The constant current and constant voltage source circuit according to claim 1, characterized in that: The first rectifying and filtering circuit includes a first rectifying circuit and a first filtering circuit; the i-th rectifying and filtering circuit includes an i-th rectifying circuit and an i-th filtering circuit; The input end of the first rectifier circuit is electrically connected to the output end of the first inverter, and the output end is electrically connected to the input end of the first filter circuit, and is used to convert the first AC voltage into a first DC voltage; the first filter circuit is used to filter the first DC voltage; The input end of the i-th rectifier circuit is electrically connected to the output end of the i-th inverter, and the output end is electrically connected to the input end of the i-th filter circuit, for converting the i-th AC voltage into an i-th DC voltage; the i-th filter circuit is used to filter the i-th DC voltage.

5. The constant current and constant voltage source circuit according to claim 4, characterized in that: The first rectifier circuit includes a single-phase bridge rectifier circuit or a three-phase bridge rectifier circuit; The first filtering circuit includes a capacitor filtering circuit or an RC filtering circuit; The i-th rectifier circuit includes a single-phase bridge rectifier circuit or a three-phase bridge rectifier circuit; The i-th filtering circuit includes a capacitor filtering circuit or an RC filtering circuit.

6. The constant current and constant voltage source circuit according to claim 1, characterized in that: The working modes of the constant current and constant voltage source circuit include constant voltage mode and constant current mode; The output circuit includes a comparator, a switch, and a voltage-current conversion module; a first input end of the comparator is electrically connected to the output end of the i-th inverter and one end of the switch, respectively, and a second input end of the comparator is electrically connected to the output end of the comparator; the other end of the switch is electrically connected to the input end of the voltage-current conversion module, and the output end of the voltage-current conversion module is electrically connected to the output end of the comparator; In the constant voltage mode, the switch is disconnected, and the output end of the comparator is used to output a constant voltage to the load; In the constant current mode, the switch is closed, the voltage-current conversion module is used to convert the received DC voltage into a constant current, and the output end of the comparator is used to output the constant current to the load.

7. The constant current and constant voltage source circuit according to claim 6, characterized in that: The constant current and constant voltage source circuit also includes a host computer; The mode setting signal output terminal of the host computer is electrically connected to the mode setting signal receiving terminal of the control circuit, and is used to transmit the mode setting signal to the control circuit; The mode control signal output terminal of the control circuit is electrically connected to the control terminal of the switch, and is used to transmit a mode control signal to the switch.

8. The constant current and constant voltage source circuit according to claim 1, characterized in that: The constant current and constant voltage source circuit also includes a protection circuit; The protection circuit includes a fuse and a diode; one end of the fuse is electrically connected to the output end of the output circuit, and the other end is electrically connected to the anode of the diode; the cathode of the diode is electrically connected to the load.

9. The constant current and constant voltage source circuit according to claim 1, characterized in that: The constant current and constant voltage source circuit further includes a current acquisition circuit; The current acquisition circuit is connected between the load and the current signal receiving end of the control circuit, and is used to acquire the current signal of the load and transmit the current signal to the control circuit.

10. The constant current and constant voltage source circuit according to claim 1, characterized in that: The constant current and constant voltage source circuit further includes a voltage acquisition circuit; The voltage acquisition circuit is connected between the load and the voltage signal receiving end of the control circuit, and is used to acquire the voltage signal of the load and transmit the voltage signal to the control circuit.

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