DC power supply device

Abstract

The invention discloses a direct-current power supply device, which relates to the technical field of high-voltage power supplies and comprises a direct-current conversion module, an input current monitoring module, an output current monitoring module, an output voltage monitoring module and a cut-off module. The direct current conversion module is used for accessing an input voltage and performing direct current voltage conversion on the input voltage; the three types of monitoring modules are respectively used for monitoring input current and output current / voltage and respectively outputting three types of trigger signals when the input current and the output current / voltage exceed respective preset thresholds; and the cut-off module is used for cutting off when any one of the three trigger signals is received, and quickly cutting off the direct current conversion module. According to the direct-current power supply device provided by the embodiment of the invention, independent real-time monitoring and trigger judgment are respectively realized on three kinds of signals through the three kinds of monitoring modules, and then the direct-current conversion module is quickly switched off through the switching-off module, so that corresponding protection mechanisms are adopted for the problems of input overcurrent, output overcurrent / overvoltage and the like at the same time; and quick response of a corresponding protection mechanism is realized.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a DC power supply device. Background Technology

[0002] DC high-voltage power supplies are commonly used in industrial testing, precision electronic testing instruments, semiconductor manufacturing, and medical equipment. However, they often experience overload, short circuit, and arcing due to abnormal loads or high-voltage component failures, leading to input overcurrent and output overcurrent / overvoltage issues. This necessitates robust protection mechanisms to ensure the safety of the load and circuitry. However, in practical applications, existing protection technologies suffer from limitations such as single-function limitations and delayed response times. They cannot simultaneously employ corresponding protection mechanisms for input overcurrent and output overcurrent / overvoltage issues, nor can they provide rapid response from these mechanisms. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a DC power supply device, including a DC conversion module, an input current monitoring module, an output current monitoring module, an output voltage monitoring module, and a cutoff module. The input current monitoring module, output current monitoring module, and output voltage monitoring module independently monitor the input current, output current, and output voltage of the DC conversion module in real time. When overcurrent or overvoltage occurs, the corresponding monitoring module directly transmits the corresponding feedback signal to the cutoff module, which quickly shuts down the DC conversion module. This achieves simultaneous protection against input overcurrent, output overcurrent / overvoltage, and other problems, along with a rapid response from the corresponding protection mechanism.

[0004] An embodiment of the first aspect of this application provides a DC power supply device, comprising: A DC-DC converter module, which is used to receive an input voltage and convert the input voltage into a DC voltage; An input current monitoring module is used to connect to and monitor the input current, and when the input current is greater than the input overcurrent threshold, it outputs a first trigger signal through the output terminal. An output current monitoring module is connected to the output terminal of the DC-DC converter module. The output current monitoring module is used to monitor the output current of the DC-DC converter module and output a second trigger signal through the output terminal when the output current is greater than the output overcurrent threshold. An output voltage monitoring module is connected to the output terminal of the DC-DC converter module. The output voltage monitoring module is used to monitor the output voltage of the DC-DC converter module and outputs a third trigger signal through the output terminal when the output voltage is greater than the output overvoltage threshold. The cut-off module includes a first switching transistor. The control terminal of the first switching transistor is connected to the output terminal of the input current monitoring module, the output terminal of the output current monitoring module, and the output terminal of the output voltage monitoring module, respectively. The output terminal of the first switching transistor is connected to the DC-DC conversion module. The first switching transistor is used to cut off when it receives any one of the first trigger signal, the second trigger signal, and the third trigger signal, and to stop the DC-DC conversion of the DC-DC conversion module when it is cut off.

[0005] The DC power supply device according to the embodiments of this application has at least the following beneficial effects: The DC power supply device of this application embodiment includes a DC-DC conversion module, an input current monitoring module, an output current monitoring module, an output voltage monitoring module, and a cutoff module. The DC-DC conversion module is used to receive an input voltage and perform DC-DC voltage conversion on the input voltage. The input current monitoring module is used to receive and monitor the input current, and outputs a first trigger signal through its output terminal when the input current exceeds an input overcurrent threshold. The output current monitoring module is connected to the output terminal of the DC-DC conversion module, and monitors the output current of the DC-DC conversion module. When the output current exceeds an output overcurrent threshold, it outputs a second trigger signal through its output terminal. The output voltage monitoring module is connected to the output terminal of the DC-DC conversion module, and monitors the output voltage of the DC-DC conversion module. When the output voltage exceeds an output overvoltage threshold, it outputs a third trigger signal through its output terminal. The cutoff module includes a first switch transistor, the control terminal of which is connected to the output terminals of the input current monitoring module, the output current monitoring module, and the output voltage monitoring module, respectively. The output terminal of the first switch transistor is connected to the DC-DC conversion module. The first switch transistor is used to cut off when it receives any one of the first, second, and third trigger signals, and stops the DC-DC voltage conversion of the DC-DC conversion module when it is cut off.

[0006] Under normal circumstances, the DC-DC converter module is connected to the input voltage, performs DC-DC conversion on the input voltage, and outputs the preset output voltage at the output terminal. For input overcurrent issues, the input current monitoring module monitors the input current in real time and determines whether the input current exceeds the input overcurrent threshold. If it does, a first trigger signal is generated and transmitted to the cut-off module. The first switch of the cut-off module turns off upon receiving the first trigger signal and quickly shuts down the DC-DC converter, stopping the DC-DC conversion of the input voltage. For output overcurrent issues, the output current monitoring module monitors the output current of the DC-DC converter in real time and determines whether the output current exceeds the output overcurrent threshold. If it does, a second trigger signal is generated and transmitted to the cut-off module. The first switch of the cut-off module turns off upon receiving the second trigger signal and quickly shuts down the DC-DC converter, stopping the DC-DC conversion of the input voltage. For output overvoltage issues, the output voltage monitoring module monitors the output voltage of the DC-DC converter in real time and determines whether the output voltage exceeds the output overvoltage threshold. If it does, a third trigger signal is generated and transmitted to the cut-off module. The first switch of the cut-off module turns off upon receiving the third trigger signal and quickly shuts down the DC-DC converter, stopping the DC-DC conversion of the input voltage. The DC power supply device in this application embodiment achieves independent real-time monitoring and trigger judgment of signals through an input current monitoring module, an output current monitoring module, and an output voltage monitoring module, and then quickly shuts down the DC conversion module through a cut-off module, so as to simultaneously adopt corresponding protection mechanisms for input overcurrent, output overcurrent / overvoltage and other problems, and the corresponding protection mechanisms respond quickly.

[0007] According to some embodiments of the first aspect of this application, the DC-DC conversion module is provided with a first signal driving terminal and a second signal driving terminal; The cut-off module also includes a second switch, a third switch, and a fourth switch; The output terminal of the first switch is connected to the control terminal of the second switch, and the output terminal of the second switch is connected to the first signal driving terminal; the first switch is used to turn off and turn on the second switch when it receives any one of the first trigger signal, the second trigger signal, and the third trigger signal; the second switch is used to pull down the level of the first signal driving terminal through its output terminal when it is turned on. The control terminal of the third switch is connected to the control terminal of the first switch, the output terminal of the third switch is connected to the control terminal of the fourth switch, and the output terminal of the fourth switch is connected to the second signal driving terminal. The third switch is used to cut off and turn on the fourth switch when it receives any one of the first trigger signal, the second trigger signal, and the third trigger signal. The fourth switch is used to pull down the level of the second signal driving terminal through its output terminal when it is turned on. When the voltage of either the first signal driving terminal or the second signal driving terminal is low, the DC voltage conversion of the DC conversion module stops.

[0008] According to some embodiments of the first aspect of this application, a control module is also included, which is connected to the input current monitoring module, the output current monitoring module and the output voltage monitoring module respectively. The control module is used to output the input overcurrent threshold, the output overcurrent threshold and the output overvoltage threshold to the input current monitoring module, the output current monitoring module and the output voltage monitoring module respectively through the output terminal.

[0009] According to some embodiments of the first aspect of this application, the DC-DC conversion module includes a drive control module, a power drive circuit, and a voltage doubler rectifier circuit; The control module is also used to generate switching signals; The input terminal of the drive control module is connected to the output terminal of the control module to receive the switch signal; the drive control module is used to output a first drive signal and a second drive signal through the output terminal. The power drive circuit includes a fifth switching transistor, a sixth switching transistor, and a step-up transformer. The power drive circuit is used to receive the input voltage, convert the input voltage into a high-frequency pulse voltage, and output the high-frequency pulse voltage through the output terminal. The control terminal of the fifth switch is connected to the output terminal of the drive control module to receive the first drive signal. The control terminal of the fifth switch serves as the first signal drive terminal, and the output terminal of the fifth switch is connected to the same-name terminal of the first winding of the primary coil of the step-up transformer. The control terminal of the sixth switch is connected to the output terminal of the drive control module to receive the second drive signal. The control terminal of the sixth switch serves as the second signal drive terminal, and the output terminal of the sixth switch is connected to the opposite-name terminal of the second winding of the primary coil of the step-up transformer. The same-name terminal of the secondary coil of the step-up transformer serves as the output terminal of the power drive circuit. The voltage doubler rectifier circuit is used to convert the high-frequency pulse voltage, generate and output a preset DC voltage through the output terminal; the input terminal of the voltage doubler rectifier circuit is connected to the same terminal of the secondary coil of the step-up transformer to receive the high-frequency pulse voltage, and the output terminal of the voltage doubler rectifier circuit is connected to an external load and serves as the output terminal of the DC-DC conversion module.

[0010] According to some embodiments of the first aspect of this application, the input current monitoring module includes an input current sampling resistor and an input current protection circuit; The input current sampling resistor is used to sample the input current and convert it into an input current sampling voltage; The input current protection circuit includes a first voltage comparator and a first resistor; the non-inverting input terminal of the first voltage comparator is connected to the output terminal of the control module to access the input overcurrent threshold, the inverting input terminal of the first voltage comparator is connected to the input terminal of the input current sampling resistor through the first resistor to access the input current sampling voltage, and the output terminal of the first voltage comparator serves as the output terminal of the input current monitoring module.

[0011] According to some embodiments of the first aspect of this application, the output current monitoring module includes an output current sampling circuit, which is used to sample the output current of the DC-DC conversion module and convert it into an output current sampling voltage, and output the output current sampling voltage through an output terminal. The output current sampling circuit includes an output current sampling resistor, a second resistor, and a non-inverting operational amplifier. The input terminal of the output current sampling resistor is connected to the output terminal of the voltage doubler rectifier circuit, and the output terminal of the output current sampling resistor is grounded. The non-inverting input terminal of the non-inverting operational amplifier is connected to the input terminal of the output current sampling resistor through the second resistor, the inverting input terminal of the non-inverting operational amplifier is grounded, and the output terminal of the non-inverting operational amplifier serves as the output terminal of the output current sampling circuit.

[0012] According to some embodiments of the first aspect of this application, the output current monitoring module further includes an output current protection circuit, which includes a second voltage comparator and a third resistor; The non-inverting input of the second voltage comparator is connected to the output of the control module to access the output overcurrent threshold. The inverting input of the second voltage comparator is connected to the output of the non-inverting operational amplifier through the third resistor. The output of the second voltage comparator serves as the output of the output current monitoring module.

[0013] According to some embodiments of the first aspect of this application, the output voltage monitoring module includes an output voltage sampling circuit, which is used to sample the output voltage of the DC-DC conversion module and amplify it in reverse to form an output voltage sampling voltage, and output the output voltage sampling voltage through an output terminal. The output voltage sampling circuit includes a high-voltage divider circuit, a fourth resistor, an operational amplifier follower circuit, and an inverting operational amplifier. The input terminal of the high-voltage divider circuit is connected to the output terminal of the voltage doubler rectifier circuit. The high-voltage divider circuit is connected to the non-inverting input terminal of the operational amplifier follower circuit through the fourth resistor. The inverting input terminal of the operational amplifier follower circuit is connected to the output terminal of the operational amplifier follower circuit. The output terminal of the operational amplifier follower circuit is connected to the inverting input terminal of the inverting operational amplifier. The non-inverting input terminal of the inverting operational amplifier is grounded. The output terminal of the inverting operational amplifier serves as the output terminal of the output voltage sampling circuit.

[0014] According to some embodiments of the first aspect of this application, the output voltage monitoring module further includes an output voltage protection circuit, which includes a third voltage comparator and a fifth resistor; The non-inverting input of the third voltage comparator is connected to the output of the control module to access the output overvoltage threshold. The inverting input of the third voltage comparator is connected to the output of the inverting operational amplifier through the fifth resistor. The output of the third voltage comparator serves as the output of the output voltage monitoring module.

[0015] According to some embodiments of the first aspect of this application, the output voltage sampling circuit further includes a bidirectional Zener diode, which is used to prevent accidental high voltage from breaking down the subsequent circuit. The high-voltage divider circuit includes a high-voltage resistor and a sixth resistor. The input terminal of the high-voltage resistor serves as the input terminal of the high-voltage divider circuit. The output terminal of the high-voltage resistor is connected to the input terminal of the sixth resistor and the input terminal of the bidirectional Zener diode. The output terminals of the sixth resistor and the output terminal of the bidirectional Zener diode are grounded.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a circuit block diagram of a DC power supply device according to an embodiment of this application; Figure 2 This is a schematic diagram of the drive control module according to an embodiment of this application; Figure 3This is a schematic diagram of the power drive circuit and the input current sampling resistor according to an embodiment of this application; Figure 4 This is a schematic diagram of the voltage doubler rectifier circuit according to an embodiment of this application; Figure 5 This is a schematic diagram of the cutting module according to an embodiment of this application; Figure 6 This is a schematic diagram of the control module according to an embodiment of this application; Figure 7 This is a schematic diagram of the output current sampling circuit, output voltage sampling circuit, current feedback adjustment module, and voltage feedback adjustment module according to an embodiment of this application. Figure 8 This is a schematic diagram of the input current protection circuit, output current protection circuit, and output voltage protection circuit according to an embodiment of this application.

[0018] Figure label: DC-DC converter module 100; drive control module 110; power drive circuit 120; fifth switch 121; sixth switch 122; step-up transformer 123; voltage doubler rectifier circuit 130; Input current monitoring module 200; input current sampling resistor 210; input current protection circuit 220; first voltage comparator 221; first resistor 222; Output current monitoring module 300; output current sampling circuit 310; output current sampling resistor 311; second resistor 312; non-inverting operational amplifier 313; output current protection circuit 320; second voltage comparator 321; third resistor 322; Output voltage monitoring module 400; output voltage sampling circuit 410; high voltage resistor 411; sixth resistor 412; fourth resistor 413; operational amplifier follower circuit 414; inverting operational amplifier 415; bidirectional Zener diode 416; output voltage protection circuit 420; third voltage comparator 421; fifth resistor 422; Cut-off module 500; first switch 510; second switch 520; third switch 530; fourth switch 540; Control module 600. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0023] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] Reference Figure 1In a first aspect, embodiments of this application provide a DC power supply device including a DC conversion module 100, an input current monitoring module 200, an output current monitoring module 300, an output voltage monitoring module 400, and a cutoff module 500. The DC conversion module 100 is used to receive an input voltage and perform DC-DC voltage conversion on the input voltage. The input current monitoring module 200 is used to receive and monitor the input current, and outputs a first trigger signal through its output terminal when the input current exceeds an input overcurrent threshold. The output current monitoring module 300 is connected to the output terminal of the DC conversion module 100, and monitors the output current of the DC conversion module 100, and outputs a second trigger signal through its output terminal when the output current exceeds an output overcurrent threshold. The output voltage monitoring module 400... The measurement module 400 is connected to the output terminal of the DC-DC conversion module 100. The output voltage monitoring module 400 is used to monitor the output voltage of the DC-DC conversion module 100, and outputs a third trigger signal through the output terminal when the output voltage is greater than the output overvoltage threshold. The cut-off module 500 includes a first switch 510. The control terminal of the first switch 510 is connected to the output terminal of the input current monitoring module 200, the output terminal of the output current monitoring module 300, and the output terminal of the output voltage monitoring module 400, respectively. The output terminal of the first switch 510 is connected to the DC-DC conversion module 100. The first switch 510 is used to cut off when it receives any one of the first trigger signal, the second trigger signal, and the third trigger signal, and stops the DC voltage conversion of the DC-DC conversion module 100 when it is cut off.

[0025] Under normal circumstances, the DC-DC converter module 100 receives the input voltage, performs DC-DC conversion on the input voltage, and outputs a preset output voltage at the output terminal. For input overcurrent issues, the input current monitoring module 200 monitors the input current in real time, determining whether the input current exceeds the input overcurrent threshold. If it does, a first trigger signal is generated and transmitted to the cut-off module 500. The first switch 510 of the cut-off module 500 cuts off upon receiving the first trigger signal, quickly turning off the DC-DC converter module 100 and stopping the DC-DC conversion of the input voltage. For output overcurrent issues, the output current monitoring module 300 monitors the output current of the DC-DC converter module 100 in real time, determining whether the output current exceeds the output overcurrent threshold. If it does, a second trigger signal is generated and transmitted to the cut-off module 500. When the first switch 510 of the cut-off module 500 receives the second touch signal, it turns off and quickly shuts down the DC-DC converter module 100, stopping the DC-DC voltage conversion of the input voltage. For output overvoltage issues, the output voltage monitoring module 400 monitors the output voltage of the DC-DC converter module 100 in real time, determining whether the output voltage exceeds the output overvoltage threshold. If it does, a third trigger signal is generated and transmitted to the cut-off module 500. When the first switch 510 of the cut-off module 500 receives the third touch signal, it turns off and quickly shuts down the DC-DC converter module 100, stopping the DC-DC voltage conversion of the input voltage. The DC power supply device in this embodiment uses the input current monitoring module 200, output current monitoring module 300, and output voltage monitoring module 400 to independently monitor and trigger signals in real time. Then, the cut-off module 500 quickly shuts down the DC-DC converter module 100, enabling simultaneous protection mechanisms for input overcurrent and output overcurrent / overvoltage issues, as well as rapid response of these protection mechanisms.

[0026] It should be noted that, referring to Figure 1The DC-DC converter module 100, after receiving the input voltage, converts the input voltage into a preset high-voltage DC voltage and outputs it to the external load through its output terminal, providing the necessary high-voltage DC voltage for the normal operation of the external load. It is the main voltage supply circuit module of the DC power supply device in this embodiment. The input current monitoring module 200 receives the input current, monitors and samples the input current in real time, and presets an input overcurrent threshold. When the input current exceeds the preset overcurrent threshold, the input current monitoring module 200 generates a first trigger signal and outputs it to the subsequent circuit through its output terminal. The input terminal of the output current monitoring module 300 is connected to the output terminal of the DC-DC converter module 100, used to receive the output current of the DC-DC converter module 100 and monitor and sample it in real time. Simultaneously, an output overcurrent threshold is preset for the output current monitoring module 300. When the output current exceeds the preset output overcurrent threshold, the output current monitoring module 300 generates a second trigger signal and outputs it to the subsequent circuit through its output terminal. The input terminal of the output voltage monitoring module 400 is connected to the output terminal of the DC-DC converter module 100, used to input the output voltage of the DC-DC converter module 100 and monitor and sample it in real time. Simultaneously, an output overvoltage threshold is preset for the output voltage monitoring module 400. When the output voltage exceeds the preset overvoltage threshold, the output voltage monitoring module 400 generates a third trigger signal and outputs it to the subsequent circuit through its output terminal. The three monitoring modules are independently configured, with no interference between them. Furthermore, the first, second, and third trigger signals are directly generated by the input current monitoring module 200, the output current monitoring module 300, and the output voltage monitoring module 400 and output to the subsequent circuit through their output terminals, without intervention from intermediate control modules such as microprocessors. This allows for independent monitoring and rapid trigger judgment of the input current and output current / voltage.

[0027] Reference Figure 5The cutoff module 500 is a common downstream circuit of the input current monitoring module 200, the output current monitoring module 300, and the output voltage monitoring module 400. The cutoff module 500 includes a first switching transistor 510. In the DC power supply device of this embodiment, the first switching transistor 510 is an N-channel MOS transistor. The control terminal of the first switching transistor 510 is the gate of the NMOS transistor, the output terminal is the drain of the NMOS transistor, and the third terminal of the first switching transistor 510 is the source of the NMOS transistor. In the DC power supply of this embodiment, the third terminal of the first switching transistor 510 is grounded, so it will not be described in detail. The control terminal of the first switch transistor 510 is connected to the output terminals of the input power monitoring module, the output current monitoring module 300, and the output voltage monitoring module 400, respectively, to receive any one of the first, second, and third trigger signals. The output terminal of the first switch transistor 510 is connected to the DC-DC conversion module 100. When the first switch transistor 510 receives any one of the first, second, and third trigger signals, it will turn off, and simultaneously turn off the DC-DC conversion module 100, stopping the DC-DC voltage conversion. The first, second, and third trigger signals are active low. During the process of the first switch transistor 510 turning off the DC-DC conversion module 100, no other microprocessor or other intermediate control modules intervene. The entire process is hardware-based, thereby achieving simultaneous protection mechanisms for input overcurrent, output overcurrent / overvoltage, and other problems, as well as rapid response of the corresponding protection mechanisms, thus better protecting the DC power supply device of this embodiment.

[0028] It should be noted that the first switching transistor 510 of the DC power supply device in this application embodiment is an N-channel MOSFET. This is only an example of this application and should not be construed as a limitation on the embodiments of this application. The first switching transistor 510 of the DC power supply device in this application embodiment can also use other types of components, such as NPN transistors. This application does not limit this.

[0029] Understandably, referring to Figures 2 to 5 The DC conversion module 100 of the DC power supply device in this application embodiment is provided with a first signal driving terminal and a second signal driving terminal; the cut-off module 500 also includes a second switch 520, a third switch 530 and a fourth switch 540; The output terminal of the first switch 510 is connected to the control terminal of the second switch 520, and the output terminal of the second switch 520 is connected to the first signal driving terminal. The first switch 510 is used to cut off when it receives any one of the first trigger signal, the second trigger signal, and the third trigger signal, and to turn on the second switch 520. The second switch 520 is used to pull down the level of the first signal driving terminal through its output terminal when it is turned on. The control terminal of the third switch 530 is connected to the control terminal of the first switch 510, the output terminal of the third switch 530 is connected to the control terminal of the fourth switch 540, and the output terminal of the fourth switch 540 is connected to the second signal driving terminal. The third switch 530 is used to cut off when it receives any one of the first trigger signal, the second trigger signal, and the third trigger signal, and to turn on the fourth switch 540. The fourth switch 540 is used to pull down the level of the second signal driving terminal through its output terminal when it is turned on. When the voltage of either the first signal driving terminal or the second signal driving terminal is low, the DC voltage conversion of the DC conversion module 100 stops.

[0030] It should be noted that, more specifically, the cutoff module 500 also includes a second switch 520, a third switch 530, and a fourth switch 540. In the DC power supply device of this application embodiment, the second switch 520, the third switch 530, and the fourth switch 540 are all N-channel MOS transistors. The control terminals of the second switch 520, the third switch 530, and the fourth switch 540 are all the gates of the NMOS transistors, and the output terminals of the second switch 520, the third switch 530, and the fourth switch 540 are all the drains of the NMOS transistors. In the DC power supply device of this application embodiment, the third terminals of the second switch 520, the third switch 530, and the fourth switch 540 are all the sources of the NMOS transistors, but the third terminals of the second switch 520, the third switch 530, and the fourth switch 540 are all grounded, so they will not be described in detail.

[0031] The DC-DC converter module 100 is provided with a first signal driving terminal and a second signal driving terminal. The output terminal of the first switch 510 is connected to the control terminal of the second switch 520, and the output terminal of the second switch 520 is connected to the first signal driving terminal. When the first switch 510 receives any one of the first trigger signal, the second trigger signal, and the third trigger signal, the first switch 510 is turned off. More specifically, the first trigger signal, the second trigger signal, and the third trigger signal are active low. In the DC power supply device of this application embodiment, the output terminal of the first switching transistor 510 is provided with a first pull-up resistor, and the output terminal of the first switching transistor 510 is connected to the control terminal of the second switching transistor 520. When the first switching transistor 510 is turned off, the voltage at the control terminal of the first switching transistor 510 decreases, and the voltage at the control terminal of the second switching transistor 520 is pulled up by the first pull-up resistor. The voltage rise causes the second switching transistor 520 to conduct. The output terminal of the second switching transistor 520 is provided with a second pull-up resistor, and the output terminal of the second switching transistor 520 is connected to the first signal driving terminal through the second pull-up resistor, causing the voltage at the first signal driving terminal to decrease, i.e., the first signal driving terminal... When the voltage at the first signal drive terminal is low, the DC voltage conversion of the DC-DC converter module 100 stops. The control terminal of the third switch 530 is connected to the control terminal of the first switch 510, the output terminal of the third switch 530 is connected to the control terminal of the fourth switch 540, and the output terminal of the fourth switch 540 is connected to the second signal drive terminal. When the third switch 530 receives any one of the first trigger signal, the second trigger signal, and the third trigger signal, the third switch 530 is turned off. More specifically, the first trigger signal, the second trigger signal, and the third trigger signal are active low.

[0032] In the DC power supply device of this application embodiment, the output terminal of the third switch 530 is provided with a third pull-up resistor, and the output terminal of the third switch 530 is connected to the control terminal of the fourth switch 540. When the third switch 530 is turned off, the voltage of the control terminal of the third switch 530 decreases, and the voltage of the control terminal of the fourth switch 540 is pulled up by the third pull-up resistor. The voltage rise causes the fourth switch 540 to turn on. The output terminal of the fourth switch 540 is provided with a fourth pull-up resistor, and the output terminal of the fourth switch 540 is connected to the second signal driving terminal through the fourth pull-up resistor, so that the voltage of the second signal driving terminal decreases, that is, the level of the second signal driving terminal is pulled low. When the voltage of the second signal driving terminal is low, the DC voltage conversion of the DC conversion module 100 stops.

[0033] Understandably, referring to Figure 6The DC power supply device in this application embodiment also includes a control module 600. The control module 600 is connected to the input current monitoring module 200, the output current monitoring module 300 and the output voltage monitoring module 400 respectively. The control module 600 is used to output the input overcurrent threshold, the output overcurrent threshold and the output overvoltage threshold to the input current monitoring module 200, the output current monitoring module 300 and the output voltage monitoring module 400 respectively through the output terminal.

[0034] It should be noted that, referring to Figure 6 The control module 600 is used to generate input overcurrent threshold, output overcurrent threshold, and output overvoltage threshold. In the DC power supply device of this application embodiment, the control module 600 can be a microcontroller, PLC, FPGA, etc., and this application does not limit it. The input overcurrent threshold, output overcurrent threshold, and output overvoltage threshold all support wide-range continuous adjustment. The specific adjustment method can be: mechanical adjustment, changing the threshold by adjusting the precision potentiometer in each threshold reference module; or electrical signal adjustment, realizing remote control of the threshold by receiving an external analog voltage signal, and this application does not limit it. The control module 600 is connected to the input power monitoring module, output power monitoring module, and output voltage monitoring module 400 respectively, and outputs the input overcurrent threshold, output overcurrent threshold, and output overvoltage threshold independently to the three types of monitoring modules through the output terminal.

[0035] Understandably, referring to Figures 2 to 6 The DC power supply device DC conversion module 100 of this application embodiment includes a drive control module 110, a power drive circuit 120 and a voltage doubler rectifier circuit 130; the control module 600 is also used to generate switching signals; The input terminal of the drive control module 110 is connected to the output terminal of the control module 600 to receive the switch signal. The drive control module 110 is used to output the first drive signal and the second drive signal through the output terminal. The power drive circuit 120 includes a fifth switch 121, a sixth switch 122, and a step-up transformer 123. The power drive circuit 120 is used to receive an input voltage, convert the input voltage into a high-frequency pulse voltage, and output the high-frequency pulse voltage through its output terminal. The control terminal of the fifth switch is connected to the output terminal of the drive control module 110 to receive a first drive signal. The control terminal of the fifth switch 121 serves as the first signal drive terminal, and its output terminal is connected to the same-name terminal of the first winding of the primary coil of the step-up transformer 123. The control terminal of the sixth switch is connected to the output terminal of the drive control module 110 to receive a second drive signal. The control terminal of the sixth switch 122 serves as the second signal drive terminal, and its output terminal is connected to the opposite-name terminal of the second winding of the primary coil of the step-up transformer 123. The same-name terminal of the secondary coil of the step-up transformer 123 serves as the output terminal of the power drive circuit 120. The voltage doubler rectifier circuit 130 is used to convert high-frequency pulse voltage, generate and output a preset DC voltage through the output terminal; the input terminal of the voltage doubler rectifier circuit 130 is connected to the same-name terminal of the secondary coil of the step-up transformer 123 to receive high-frequency pulse voltage, and the output terminal of the voltage doubler rectifier circuit 130 is connected to an external load and serves as the output terminal of the DC-DC conversion module 100.

[0036] It should be noted that, referring to Figures 2 to 6 , Figure 6 The ON / OFF terminal of the control module 600 is connected to Figure 2 Terminal 10 of the drive control module 110 in the middle; Figure 2 The 14th terminal of the drive control module 110 is connected to the resistor R2. Figure 3 The G terminal of the fifth switch transistor 121 in the middle, Figure 2 The 11th terminal of the drive control module 110 is connected to the resistor R3. Figure 3 The G terminal of the sixth switch transistor 122 in the middle; Figure 3 The non-nominated terminal 10 of the secondary coil of the step-up transformer 123 is connected to Figure 4 One end of capacitor C1 is connected, Figure 3 The corresponding terminal 6 of the secondary coil of the step-up transformer 123 is connected to... Figure 4 One end of capacitor C11 in the middle is connected; Figure 5 The drain terminal of the second switching transistor 520 is connected to resistor R2 via the second pull-up resistor. Figure 3 The G terminal of the fifth switch transistor 121 in the middle, Figure 5 The drain terminal of the fourth switch transistor 540 is connected to resistor R3 via the fourth pull-up resistor. Figure 3 The G terminal of the sixth switch transistor 122 in the circuit.

[0037] It should be noted that the DC-DC conversion module 100 includes a drive control module 110, a power drive module, and a voltage doubler rectifier circuit 130, which are arranged sequentially. In the DC power supply device of this application embodiment, the drive control module 110 is a pulse width modulation chip for switching power supplies, model UC1525A. The input terminal of the drive control module 110 is connected to the output terminal of the control module 600. The control module 600 outputs a switching signal to the drive control module 110 through its output terminal to start the drive control module 110. After receiving the switching signal, the drive control module 110 generates a first drive signal and a second drive signal, and outputs the first drive signal and the second drive signal through its output terminal.

[0038] The power drive circuit 120 includes a fifth switch 121, a sixth switch 122, and a boost transformer 123. The power drive circuit 120 is used to receive the input voltage, convert the input voltage into a high-frequency pulse voltage, and output the high-frequency pulse voltage through its output terminal. The fifth switch 121 and the sixth switch 122 are both N-channel MOSFETs. The control terminals of both the fifth and sixth switches are the gates of the NMOS transistors, and the output terminals of both are the drains. The third terminals of both the fifth and sixth switches are the sources of the NMOS transistors and are grounded. Therefore, they will not be described in detail. The control terminal of the fifth switch 121 is connected to the output terminal of the drive control module 110, receiving the first drive signal output by the drive control module 110. When the voltage at the control terminal of the fifth switch 121 increases, the fifth switch 121 is turned on, and the power drive circuit 120 is turned on to perform high-frequency pulse voltage conversion on the input voltage. The control terminal of the fifth switch 121 serves as the first signal drive terminal of the DC-DC converter module 100. Therefore, the output terminal of the second switch 520 is connected to the control terminal of the fifth switch 121 via a second pull-up resistor. When the second switch 520 is turned on, the second pull-up resistor pulls down the voltage at the control terminal of the fifth switch 121, meaning the level of the first signal drive terminal is pulled down, the fifth switch 121 is turned off, and consequently, the power drive circuit 120 is turned off, meaning the DC-DC converter module 100 is turned off. The control terminal of the sixth switch 122 is connected to the output terminal of the drive control module 110, receiving the second drive signal output by the drive control module 110. When the voltage at the control terminal of the sixth switch 122 increases, the sixth switch 122 is turned on, the power drive circuit 120 is turned on, and it performs high-frequency pulse voltage conversion on the input voltage. The control terminal of the sixth switch transistor 122 serves as the second signal drive terminal of the DC-DC converter module 100. Therefore, the output terminal of the fourth switch transistor 540 is connected to the control terminal of the sixth switch transistor 122 through the fourth pull-up resistor. When the fourth switch transistor 540 is turned on, the fourth pull-up resistor pulls down the voltage of the control terminal of the sixth switch transistor 122, that is, the level of the second signal drive terminal is pulled down, the sixth switch transistor 122 is turned off, and the power drive circuit 120 is turned off, that is, the DC-DC converter module 100 is turned off.

[0039] In the DC power supply device of this application embodiment, the step-up transformer 123 is provided with a primary coil and a secondary coil. The primary coil is provided with a first winding and a second winding. The output terminal of the fifth switch 121 is connected to the same-name terminal of the first winding of the primary coil, and the output terminal of the sixth switch 122 is connected to the opposite-name terminal of the second winding of the primary coil. The same-name terminal of the secondary coil serves as the output terminal of the power drive circuit 120. The step-up transformer 123 converts the input voltage into a high-frequency pulse voltage and outputs a high-voltage pulse voltage to the subsequent circuit through the output terminal.

[0040] The voltage multiplier rectifier circuit 130 is a downstream circuit of the power drive circuit 120. It is used to convert high-frequency pulse voltage, generate and output a preset DC voltage, i.e., a preset high-voltage DC voltage, through the output terminal. In the DC power supply device of this application embodiment, the voltage multiplier rectifier circuit 130 is a ten-stage voltage multiplier circuit, consisting of ten cascaded voltage multiplier units. Each voltage multiplier unit includes a matched rectifier diode and an energy storage capacitor. It can receive the high-frequency pulse voltage output by the power drive circuit 120, and after multiple sequential superposition rectification and energy storage, the high-frequency pulse voltage is raised to the preset high-voltage DC voltage and output to the external load through the output terminal to provide the required voltage for the external load. In this application embodiment, the voltage multiplier rectifier circuit 130 outputs a negative voltage. By switching the diode direction, a positive voltage can be output. Furthermore, the voltage multiplier rectifier circuit 130 can achieve different voltage multipliers by adding or removing voltage multiplier units, which is not limited in this application.

[0041] It should be noted that the model of the drive control module 110 of the DC power supply device in this application embodiment is only an example of this application and should not be construed as limiting the embodiments of this application. Other types of drive control modules 110 can also be used in the DC power supply device of this application embodiment, and this application does not limit them. The first switch 510, the second switch 520, the third switch 530, the fourth switch 540, the fifth switch 121, and the sixth switch 122 of the DC power supply device in this application embodiment are all N-channel MOS transistors of the same size. This is only an example of this application and should not be construed as limiting the embodiments of this application. Other types of first switch 510, second switch 520, third switch 530, fourth switch 540, fifth switch 121, and sixth switch 122 can also be used in the DC power supply device of this application embodiment, and this application does not limit them.

[0042] Understandably, referring to Figure 3 and Figure 8 The input current monitoring module 200 of the DC power supply device in this application embodiment includes an input current sampling resistor 210 and an input current protection circuit 220; The input current sampling resistor 210 is used to sample the input current and convert it into an input current sampling voltage; the input current protection circuit 220 includes a first voltage comparator 221 and a first resistor 222; the non-inverting input terminal of the first voltage comparator 221 is connected to the output terminal of the control module 600 to access the input overcurrent threshold, and the inverting input terminal of the first voltage comparator 221 is connected to the input terminal of the input current sampling resistor 210 through the first resistor 222 to access the input current sampling voltage; the output terminal of the first voltage comparator 221 serves as the output terminal of the input current monitoring module 200.

[0043] It should be noted that, referring to Figure 3 , Figure 5 , Figure 6 and Figure 8 , Figure 6 The DAC1 terminal of the control module 600 is connected to Figure 8 The inverting input terminal 3 of the first voltage comparator 221 in the circuit, Figure 3 The S terminal of the sixth switch transistor 122 is connected to the first resistor 222. Figure 8 The non-inverting input terminal 2 of the first voltage comparator 221 in the circuit, Figure 3 The output terminal 1 of the first voltage comparator 221 is connected to Figure 5 The G terminal of the first switching transistor 510 and the G terminal of the third switching transistor 530.

[0044] It should be noted that the input current sampling resistor 210 is a low-temperature drift alloy resistor, with one end connected in series with the third terminal of the fifth switch 121 and the sixth switch 122, i.e., the source of the NMOS transistor, and the other end grounded. The input current sampling resistor 210 is used to sample the input current and then convert it into an input current sampling voltage. The input current protection circuit 220 includes a first voltage comparator 221 and a first resistor 222. The first voltage comparator 221 is an LM393. Its non-inverting input is connected to the output of the control module 600 to receive an input overcurrent threshold, which is the input voltage corresponding to a preset input current. Its inverting input is connected to the input of the input current sampling resistor 210 via a first resistor 222, allowing it to receive an input current sampling voltage. The first voltage comparator 221 compares the input current sampling voltage with the input overcurrent threshold. When the input current sampling voltage exceeds the input overcurrent threshold, the first voltage comparator 221 generates a first trigger signal and outputs it. This first trigger signal is active low. In the DC power supply device of this embodiment, a first capacitor is provided between the first voltage comparator 221 and the first resistor 222. One end of the first capacitor is connected to the inverting input of the first voltage comparator 221, and the other end is grounded. The first resistor 222 and the first capacitor form a first low-pass filter, which can suppress noise interference on the input overcurrent threshold and allow the subsequent cutoff module 500 to respond quickly.

[0045] It should be noted that the input current sampling resistor 210 in this application embodiment is only an example of this application and should not be construed as limiting the embodiments of this application. Other types of input current sampling resistors 210 can also be used in the DC power supply device of this application embodiment, and this application does not limit them.

[0046] Understandably, referring to Figure 7 The DC power supply device output current monitoring module 300 of this application embodiment includes an output current sampling circuit 310. The output current sampling circuit 310 is used to sample the output current of the DC conversion module 100 and convert it into an output current sampling voltage, and output the output current sampling voltage through the output terminal. The output current sampling circuit 310 includes an output current sampling resistor 311, a second resistor 312, and a non-inverting operational amplifier 313. The input terminal of the output current sampling resistor 311 is connected to the output terminal of the voltage doubler rectifier circuit 130, and the output terminal of the output current sampling resistor 311 is grounded. The non-inverting input terminal of the non-inverting operational amplifier 313 is connected to the input terminal of the output current sampling resistor 311 through the second resistor 312, and the inverting input terminal of the non-inverting operational amplifier 313 is grounded. The output terminal of the non-inverting operational amplifier 313 serves as the output terminal of the output current sampling circuit 310.

[0047] It should be noted that, referring to Figure 4 and Figure 7 , Figure 4 The cathode of diode D1 is connected to the second resistor 312. Figure 7 The non-inverting input terminal 3 of the non-inverting operational amplifier 313 in the middle.

[0048] It should be noted that the output current sampling circuit 310 includes an output current sampling resistor 311, a second resistor 312, and a non-inverting operational amplifier 313. The output current sampling resistor 311 is a high-precision thick-film resistor with a precision of 0.1%. Its input terminal is connected to the output terminal of the voltage doubler rectifier circuit 130, which is also connected to the output terminal of the DC-DC converter module 100. The output terminal is grounded. The non-inverting input terminal of the non-inverting operational amplifier 313 is connected to the input terminal of the output current sampling resistor 311 through the second resistor 312. Its inverting input terminal is grounded. The output current sampling resistor 311 samples the output current, which is then converted and amplified by the non-inverting operational amplifier 313 to generate an output current sampling voltage, which is then output. In the output current sampling circuit 310, the second resistor 312 is used to prevent accidental high voltage from damaging the non-inverting operational amplifier 313. A second capacitor is provided between the non-inverting input terminal of the non-inverting operational amplifier 313 and the second resistor 312. One end of the second capacitor is connected to the non-inverting input terminal of the non-inverting operational amplifier 313, and the other end is grounded. The second resistor 312 and the second capacitor form a second low-pass filter to suppress signal fluctuations and ensure the fast response of the subsequent output current protection circuit 320.

[0049] It should be noted that the output current sampling resistor 311 in this application embodiment is only an example of this application and should not be construed as limiting the embodiments of this application. Other types of output current sampling resistors 311 can also be used in the DC power supply device of this application embodiment, and this application does not limit them.

[0050] Understandably, referring to Figure 8 The DC power supply device output current monitoring module 300 in this application embodiment further includes an output current protection circuit 320, which includes a second voltage comparator 321 and a third resistor 322. The non-inverting input of the second voltage comparator 321 is connected to the output of the control module 600 to access the output overcurrent threshold. The inverting input of the second voltage comparator 321 is connected to the output of the non-inverting operational amplifier 313 through the third resistor 322. The output of the second voltage comparator 321 serves as the output of the output current monitoring module 300.

[0051] It should be noted that, referring to Figures 5 to 8 , Figure 7 The output terminal 1 of the non-inverting operational amplifier 313 is connected to the third resistor 322. Figure 8 The non-inverting input terminal 6 of the second voltage comparator 321 in the circuit. Figure 6 The DAC2 terminal of the control module 600 is connected to Figure 8 The inverting input terminal 5 of the second voltage comparator 321 in the circuit, Figure 8 The output terminal 7 of the second voltage comparator 321 is connected to Figure 5 The G terminal of the first switching transistor 510 and the G terminal of the second switching transistor 520 are connected.

[0052] It should be noted that the output current protection circuit 320 includes a second voltage comparator 321 and a third resistor 322. The second voltage comparator 321 is an LM393. Its non-inverting input is connected to the output of the control module 600 to receive an output overcurrent threshold, which is the output voltage corresponding to a preset output current. The inverting input is connected to the output of the non-inverting operational amplifier 313 via the third resistor 322 to receive an output current sampling voltage. The second voltage comparator 321 compares the output current sampling voltage with the output overcurrent threshold. When the output current sampling voltage exceeds the output overcurrent threshold, the second voltage comparator 321 generates a second trigger signal and outputs it. This second trigger signal is active low. In the DC power supply device of this embodiment, a third capacitor is provided between the second voltage comparator 321 and the third resistor 322. One end of the third capacitor is connected to the inverting input of the second voltage comparator 321, and the other end is grounded. The third resistor 322 and the third capacitor form a third low-pass filter. The third low-pass filter can suppress noise interference on the output overcurrent threshold and enable the subsequent cut-off module 500 to respond quickly.

[0053] Understandably, referring to Figure 7 The DC power supply device output voltage monitoring module 400 of this application embodiment includes an output voltage sampling circuit 410. The output voltage sampling circuit 410 is used to sample the output voltage of the DC conversion module 100 and amplify it in reverse to form an output voltage sampling voltage, and output the output voltage sampling voltage through the output terminal. The output voltage sampling circuit 410 includes a high-voltage divider circuit, a fourth resistor 413, an operational amplifier follower circuit 414, and an inverting operational amplifier 415. The input terminal of the high-voltage divider circuit is connected to the output terminal of the voltage doubler rectifier circuit 130. The high-voltage divider circuit is connected to the non-inverting input terminal of the operational amplifier follower circuit 414 through the fourth resistor 413. The inverting input terminal of the operational amplifier follower circuit 414 is connected to the output terminal of the operational amplifier follower circuit 414. The output terminal of the operational amplifier follower circuit 414 is connected to the inverting input terminal of the inverting operational amplifier 415. The non-inverting input terminal of the inverting operational amplifier 415 is grounded. The output terminal of the inverting operational amplifier 415 serves as the output terminal of the output voltage sampling circuit 410.

[0054] It should be noted that the input terminal of the high-voltage divider circuit is connected to the output terminal of the voltage doubler rectifier circuit 130, which is also the output terminal of the DC-DC converter module 100, and is used to perform voltage division and sampling of the output voltage. The non-inverting input terminal of the operational amplifier follower circuit 414 is connected to the high-voltage divider circuit through the fourth resistor 413, and the inverting input terminal is connected to the output terminal of the operational amplifier follower circuit 414. The operational amplifier follower circuit 414 is used to enhance the driving capability of the sampling signal received from the high-voltage divider circuit and outputs it through its output terminal. The inverting input terminal of the inverting operational amplifier 415 is connected to the output terminal of the operational amplifier follower circuit 414 to receive the sampling signal with enhanced driving capability. The non-inverting input terminal of the inverting operational amplifier 415 is grounded. The sampling signal is converted into an output voltage sampling voltage by inversion and amplification by the inverting operational amplifier 415, and the inverting operational amplifier 415 outputs this output voltage sampling voltage through its output terminal. In the output voltage sampling circuit 410, the fourth resistor 413 is used to prevent accidental high voltage from damaging the op-amp follower circuit 414 and the inverting operational amplifier 415. A fourth capacitor is provided between the non-inverting input terminal of the op-amp follower circuit 414 and the fourth resistor 413. One end of the fourth capacitor is connected to the non-inverting input terminal of the op-amp follower circuit 414, and the other end is grounded. The fourth resistor 413 and the fourth capacitor form a fourth low-pass filter to suppress signal fluctuations and ensure the fast response of the subsequent output voltage protection circuit 420.

[0055] Understandably, referring to Figure 8 The DC power supply device output voltage monitoring module 400 in this application embodiment further includes an output voltage protection circuit 420, which includes a third voltage comparator 421 and a fifth resistor 422. The non-inverting input of the third voltage comparator 421 is connected to the output of the control module 600 to access the output overvoltage threshold. The inverting input of the third voltage comparator 421 is connected to the output of the inverting operational amplifier 415 through the fifth resistor 422. The output of the third voltage comparator 421 serves as the output of the output voltage monitoring module 400.

[0056] It should be noted that, referring to Figures 5 to 8 , Figure 7 The output terminal 7 of the inverting operational amplifier 415 is connected to the fifth resistor 422. Figure 8 The non-inverting input terminal 2 of the third voltage comparator 421 in the circuit. Figure 6 The DAC3 terminal of the control module 600 is connected to Figure 8 The inverting input terminal 3 of the third voltage comparator 421 in the circuit. Figure 8 The output terminal 1 of the third voltage comparator 421 is connected to Figure 5 The G terminal of the first switching transistor 510 and the G terminal of the second switching transistor 520 are connected.

[0057] It should be noted that the output voltage protection circuit 420 includes a third voltage comparator 421 and a fifth resistor 422. The third voltage comparator 421 is an LM393. Its non-inverting input is connected to the output of the control module 600 to receive an output overvoltage threshold, which is a preset output voltage. The inverting input is connected to the output of the inverting operational amplifier 415 via the fifth resistor 422 to receive an output voltage sampling voltage. The third voltage comparator 421 compares the output voltage sampling voltage with the output overvoltage threshold. When the output voltage sampling voltage exceeds the output overvoltage threshold, the third voltage comparator 421 generates a third trigger signal and outputs it. This third trigger signal is active low. In the DC power supply device of this embodiment, a fifth capacitor is provided between the third voltage comparator 421 and the fifth resistor 422. One end of the fifth capacitor is connected to the inverting input of the third voltage comparator 421, and the other end is grounded. The fifth resistor 422 and the fifth capacitor form the fifth low-pass filter. The fifth low-pass filter can suppress noise interference on the output overvoltage threshold and enable the subsequent cut-off module 500 to respond quickly.

[0058] It should be noted that the first voltage comparator 221, the second voltage comparator 321, and the third voltage comparator 421 of the DC power supply device in this application embodiment are only examples of this application and should not be construed as limiting the embodiments of this application. The first voltage comparator 221, the second voltage comparator 321, and the third voltage comparator 421 of this application embodiment can also use other types of comparators or chips that can achieve similar functions, and this application does not limit them.

[0059] Understandably, referring to Figure 7 The output voltage sampling circuit 410 of the DC power supply device in this application embodiment also includes a bidirectional Zener diode 416, which is used to prevent accidental high voltage from breaking down the subsequent circuit. The high-voltage divider circuit includes a high-voltage resistor 411 and a sixth resistor 412. The input terminal of the high-voltage resistor 411 serves as the input terminal of the high-voltage divider circuit. The output terminal of the high-voltage resistor 411 is connected to the input terminal of the sixth resistor 412 and the input terminal of the bidirectional Zener diode 416. The output terminals of the sixth resistor 412 and the output terminal of the bidirectional Zener diode 416 are grounded.

[0060] It should be noted that, referring to Figure 4 and Figure 7 , Figure 4 The anode of diode D10 in the circuit is connected to Figure 7One end of the high-voltage resistor 411. The bidirectional Zener diode 416 in the DC power supply device of this application embodiment is a common bidirectional Zener diode 416 in this technical field. The output voltage sampling circuit 410 also includes a bidirectional Zener diode 416, which is used to prevent accidental high voltage from breaking down the subsequent circuit. The high-voltage divider circuit of the DC power supply device of this application embodiment includes a high-voltage resistor 411 and a sixth resistor 412. The input terminal of the high-voltage resistor 411 is connected to the output terminal of the voltage doubler rectifier circuit 130, and the output terminal is connected to the input terminal of the sixth resistor 412. The output terminal of the sixth resistor 412 is grounded. The input terminal of the bidirectional Zener diode 416 is connected to the input terminal of the sixth resistor 412, and the output terminal is grounded. The output terminal of the high-voltage resistor 411 is connected to the non-inverting input terminal of the operational amplifier follower circuit 414.

[0061] Reference Figure 1 and Figure 7 In the DC power supply device of this application embodiment, a current feedback adjustment module and a voltage feedback adjustment module are also included. (Refer to...) Figure 2 , Figure 6 and Figure 7 , Figure 7 The output terminal 1 of the non-inverting operational amplifier 313 is connected to the resistor R14. Figure 6 The ADC1 terminal of the control module 600, Figure 6 The DAC4 terminal of the control module 600 is connected to Figure 7 The current feedback adjustment module in the middle, Figure 7 The current feedback adjustment module is connected to the diode D11. Figure 2 The 9th terminal of the drive control module 110; Figure 7 The output terminal 7 of the inverting operational amplifier 415 is connected to the resistor R24. Figure 6 The ADC2 terminal of the 600 control module Figure 6 The DAC5 terminal of the control module 600 is connected to Figure 7 The voltage feedback adjustment module in the middle, Figure 7 The voltage feedback adjustment module is connected to the diode D14. Figure 2 The 9th terminal of the drive control module 110.

[0062] The output current sampling circuit 310 outputs the aforementioned output current sampling voltage to the control module 600 through its output terminal. The control module 600 generates an output current adjustment signal based on the output current sampling voltage and outputs the output current adjustment signal to the current feedback adjustment module through its output terminal. After receiving the current adjustment signal, the current feedback module generates a current adjustment feedback signal and outputs the current adjustment feedback signal to the drive control module 110 through a diode. The drive control module 110 receives the current adjustment feedback signal and controls the power drive circuit 120 and the voltage doubler rectifier circuit 130 to adjust the value of the output current. The output voltage sampling circuit 410 outputs the aforementioned output voltage sampling voltage to the control module 600 through its output terminal. The control module 600 generates an output voltage adjustment signal based on the output voltage sampling voltage and outputs the output voltage adjustment signal to the voltage feedback adjustment module through its output terminal. After receiving the voltage adjustment signal, the voltage feedback module generates a voltage adjustment feedback signal and outputs the voltage adjustment feedback signal to the drive control module 110 through a diode. The drive control module 110 receives the voltage adjustment feedback signal and controls the power drive circuit 120 and the voltage doubler rectifier circuit 130 to adjust the value of the output voltage. In the DC power supply device of this application embodiment, the current feedback adjustment module and the voltage feedback adjustment module are only auxiliary modules, and therefore will not be described in detail.

[0063] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A direct current power supply device characterized by comprising: include: A DC-DC converter module, which is used to receive an input voltage and convert the input voltage into a DC voltage; An input current monitoring module is used to connect to and monitor the input current, and when the input current is greater than the input overcurrent threshold, it outputs a first trigger signal through the output terminal. An output current monitoring module is connected to the output terminal of the DC-DC converter module. The output current monitoring module is used to monitor the output current of the DC-DC converter module and output a second trigger signal through the output terminal when the output current is greater than the output overcurrent threshold. An output voltage monitoring module is connected to the output terminal of the DC-DC converter module. The output voltage monitoring module is used to monitor the output voltage of the DC-DC converter module and outputs a third trigger signal through the output terminal when the output voltage is greater than the output overvoltage threshold. The cut-off module includes a first switching transistor. The control terminal of the first switching transistor is connected to the output terminal of the input current monitoring module, the output terminal of the output current monitoring module, and the output terminal of the output voltage monitoring module, respectively. The output terminal of the first switching transistor is connected to the DC-DC conversion module. The first switching transistor is used to cut off when it receives any one of the first trigger signal, the second trigger signal, and the third trigger signal, and to stop the DC-DC conversion of the DC-DC conversion module when it is cut off.

2. The direct-current power supply device according to claim 1, characterized by The DC-DC conversion module is provided with a first signal driving terminal and a second signal driving terminal; The cut-off module also includes a second switch, a third switch, and a fourth switch; The output terminal of the first switch is connected to the control terminal of the second switch, and the output terminal of the second switch is connected to the first signal driving terminal; the first switch is used to turn off and turn on the second switch when it receives any one of the first trigger signal, the second trigger signal, and the third trigger signal; the second switch is used to pull down the level of the first signal driving terminal through its output terminal when it is turned on. The control terminal of the third switch is connected to the control terminal of the first switch, the output terminal of the third switch is connected to the control terminal of the fourth switch, and the output terminal of the fourth switch is connected to the second signal driving terminal. The third switch is used to cut off and turn on the fourth switch when it receives any one of the first trigger signal, the second trigger signal, and the third trigger signal. The fourth switch is used to pull down the level of the second signal driving terminal through its output terminal when it is turned on. When the voltage of either the first signal driving terminal or the second signal driving terminal is low, the DC voltage conversion of the DC conversion module stops.

3. The direct-current power supply device according to claim 2, characterized by It also includes a control module, which is connected to the input current monitoring module, the output current monitoring module and the output voltage monitoring module respectively. The control module is used to output the input overcurrent threshold, the output overcurrent threshold and the output overvoltage threshold to the input current monitoring module, the output current monitoring module and the output voltage monitoring module respectively through the output terminal.

4. The direct-current power supply device according to claim 3, characterized by The DC-DC conversion module includes a drive control module, a power drive circuit, and a voltage doubler rectifier circuit. The control module is also used to generate switching signals; The input terminal of the drive control module is connected to the output terminal of the control module to receive the switch signal; the drive control module is used to output a first drive signal and a second drive signal through the output terminal. The power drive circuit includes a fifth switching transistor, a sixth switching transistor, and a step-up transformer. The power drive circuit is used to receive the input voltage, convert the input voltage into a high-frequency pulse voltage, and output the high-frequency pulse voltage through the output terminal. The control terminal of the fifth switch is connected to the output terminal of the drive control module to receive the first drive signal. The control terminal of the fifth switch serves as the first signal drive terminal, and the output terminal of the fifth switch is connected to the same-name terminal of the first winding of the primary coil of the step-up transformer. The control terminal of the sixth switch is connected to the output terminal of the drive control module to receive the second drive signal. The control terminal of the sixth switch serves as the second signal drive terminal, and the output terminal of the sixth switch is connected to the opposite-name terminal of the second winding of the primary coil of the step-up transformer. The same-name terminal of the secondary coil of the step-up transformer serves as the output terminal of the power drive circuit. The voltage doubler rectifier circuit is used to convert the high-frequency pulse voltage, generate and output a preset DC voltage through the output terminal; the input terminal of the voltage doubler rectifier circuit is connected to the same terminal of the secondary coil of the step-up transformer to receive the high-frequency pulse voltage, and the output terminal of the voltage doubler rectifier circuit is connected to an external load and serves as the output terminal of the DC-DC conversion module.

5. The direct current power supply device according to claim 4, wherein The input current monitoring module includes an input current sampling resistor and an input current protection circuit; The input current sampling resistor is used to sample the input current and convert it into an input current sampling voltage; The input current protection circuit includes a first voltage comparator and a first resistor; the non-inverting input terminal of the first voltage comparator is connected to the output terminal of the control module to access the input overcurrent threshold, the inverting input terminal of the first voltage comparator is connected to the input terminal of the input current sampling resistor through the first resistor to access the input current sampling voltage, and the output terminal of the first voltage comparator serves as the output terminal of the input current monitoring module.

6. The direct current power supply device according to claim 4, wherein The output current monitoring module includes an output current sampling circuit, which is used to sample the output current of the DC-DC conversion module and convert it into an output current sampling voltage, and output the output current sampling voltage through the output terminal. The output current sampling circuit includes an output current sampling resistor, a second resistor, and a non-inverting operational amplifier. The input terminal of the output current sampling resistor is connected to the output terminal of the voltage doubler rectifier circuit, and the output terminal of the output current sampling resistor is grounded. The non-inverting input terminal of the non-inverting operational amplifier is connected to the input terminal of the output current sampling resistor through the second resistor, the inverting input terminal of the non-inverting operational amplifier is grounded, and the output terminal of the non-inverting operational amplifier serves as the output terminal of the output current sampling circuit.

7. The direct current power supply device according to claim 6, wherein The output current monitoring module also includes an output current protection circuit, which includes a second voltage comparator and a third resistor. The non-inverting input of the second voltage comparator is connected to the output of the control module to access the output overcurrent threshold. The inverting input of the second voltage comparator is connected to the output of the non-inverting operational amplifier through the third resistor. The output of the second voltage comparator serves as the output of the output current monitoring module.

8. The DC power supply device according to claim 4, characterized in that, The output voltage monitoring module includes an output voltage sampling circuit, which is used to sample the output voltage of the DC-DC conversion module and amplify it in reverse to form an output voltage sampling voltage, and output the output voltage sampling voltage through the output terminal. The output voltage sampling circuit includes a high-voltage divider circuit, a fourth resistor, an operational amplifier follower circuit, and an inverting operational amplifier. The input terminal of the high-voltage divider circuit is connected to the output terminal of the voltage doubler rectifier circuit. The high-voltage divider circuit is connected to the non-inverting input terminal of the operational amplifier follower circuit through the fourth resistor. The inverting input terminal of the operational amplifier follower circuit is connected to the output terminal of the operational amplifier follower circuit. The output terminal of the operational amplifier follower circuit is connected to the inverting input terminal of the inverting operational amplifier. The non-inverting input terminal of the inverting operational amplifier is grounded. The output terminal of the inverting operational amplifier serves as the output terminal of the output voltage sampling circuit.

9. The direct current power supply device according to claim 8, characterized by The output voltage monitoring module also includes an output voltage protection circuit, which includes a third voltage comparator and a fifth resistor. The non-inverting input of the third voltage comparator is connected to the output of the control module to access the output overvoltage threshold. The inverting input of the third voltage comparator is connected to the output of the inverting operational amplifier through the fifth resistor. The output of the third voltage comparator serves as the output of the output voltage monitoring module.

10. The direct current power supply device according to claim 9, wherein The output voltage sampling circuit also includes a bidirectional Zener diode, which is used to prevent accidental high voltage from damaging the subsequent circuit. The high-voltage divider circuit includes a high-voltage resistor and a sixth resistor. The input terminal of the high-voltage resistor serves as the input terminal of the high-voltage divider circuit. The output terminal of the high-voltage resistor is connected to the input terminal of the sixth resistor and the input terminal of the bidirectional Zener diode. The output terminals of the sixth resistor and the output terminal of the bidirectional Zener diode are grounded.

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