Current-adjustable generating circuit
By designing a current adjustable generation circuit, using the combination of voltage generation module and current generation module, the problem of high cost of relay protection testers in the power industry is solved, and the flexible adjustment and verification of current and voltage signals is realized, reducing the testing cost .
Patent Information
- Application Number
- CN202422658259.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-11-01
AI Technical Summary
Existing relay protection testers are expensive and limited in quantity, making it difficult to meet the needs of telemetry equipment, making it difficult to achieve accurate and reliable current and voltage signal verification in the power industry.
A current adjustable generator circuit is designed, including a voltage generator module and a current generator module. The conversion and output of AC voltage is achieved by switching switches and shunt branches, which can output different AC currents, simplifying the circuit structure and reducing testing costs.
It realizes the use of a simple circuit structure to generate voltage and current that meets the requirements, reduces the testing cost, and can output a fixed AC voltage and different AC currents to meet different needs by flexibly setting the resistance value and the connection between switching terminals.
Smart Images
Figure CN222259441U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of electronic technology, and in particular to a current adjustable generating circuit. Background Art
[0002] In the existing power industry, telemetry equipment is used to remotely measure and monitor various electrical parameters in the power system. In order to ensure the accuracy and reliability of telemetry equipment, it is necessary to verify it by simulating signals such as voltage and current. Existing verification equipment usually uses relay protection instruments to calibrate telemetry equipment, but relay protection testers are expensive, the number of companies equipped is limited, and there are many R&D personnel, which makes it difficult for relay protection testers to meet the needs in actual applications. Therefore, how to use a simple circuit structure to generate voltage and current that meet the requirements to reduce testing costs is a technical problem that needs to be solved urgently. Utility Model Content
[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a current adjustable generating circuit, which can generate voltage and current that meet the requirements using a simple circuit structure, thereby reducing the test cost.
[0004] In order to achieve the above purpose, this application adopts the following technical solutions:
[0005] In a first aspect, the present application provides a current adjustable generating circuit, comprising:
[0006] A voltage generating module, the voltage generating module comprising a first voltage converting unit and a second voltage converting unit, the first voltage converting unit being used to convert an external input voltage into a first alternating voltage and output the first alternating voltage, the second voltage converting unit being used to convert the external input voltage into a second alternating voltage;
[0007] A current generating module, the current generating module includes a switching switch, a shunt branch and a first output terminal, the input end of the switching switch is connected to the first output end of the second voltage conversion unit, the shunt branch is provided with a plurality of switching terminals, a first resistor is provided between each two adjacent switching terminals, the output end of the switching switch is the same as the number of the first resistors and can be connected to different switching terminals so that the second AC voltage is connected to one of the switching terminals, the end of the shunt branch is connected to the first end of the first output terminal, the second end of the first output terminal is connected to the second output end of the second voltage conversion unit, and the first output terminal is used for an external device to output AC current.
[0008] The current adjustable generating circuit according to the first aspect of the present application has at least the following beneficial effects:
[0009] The external AC voltage is input into the first voltage conversion module and the second voltage conversion module. The first voltage conversion unit converts the external AC voltage into the first AC voltage and outputs it. The second voltage conversion unit converts the external AC voltage into the second AC voltage. By turning on the switching switch and one of the switching terminals of the shunt branch, the second AC voltage is input into the branch corresponding to the switching terminal through the switching switch. After the second AC voltage passes through the first resistor, the AC current is finally output at the end of the branch. The first output terminal is connected to the external device so that the AC current flows into the external device. Among them, the switching switch is turned on with different switching terminals, so that the second AC voltage flows through different branches in the shunt branch. Due to the difference in the first resistors passed, the generated AC current is different. Therefore, compared with the related art, the circuit structure of the present application is simpler, a fixed AC voltage can be output, and different AC currents can be output by turning on different switching terminals or flexibly setting the number and resistance of the first resistors in the shunt branch. Therefore, the embodiment of the present application solves the technical problem of how to use a simple circuit structure to generate voltage and current that meet the requirements to reduce the test cost.
[0010] According to some embodiments of the present application, the current generating module also includes a detection terminal, a first end of the detection terminal is connected to the end of the shunt branch, a second end of the detection terminal is connected to the first end of the first output terminal, and the detection terminal is used for an external ammeter.
[0011] According to some embodiments of the present application, the voltage generating module further includes a voltage output unit, and an input end of the voltage output unit is connected to an output end of the first voltage conversion unit.
[0012] According to some embodiments of the present application, the voltage output unit includes a control switch and a second output terminal, the input end of the control switch is connected to the first output end of the first voltage conversion unit, the output end of the control switch is connected to the first end of the second output terminal, the second end of the second output terminal is connected to the second output end of the first voltage conversion unit, and the second output terminal is used for an external device to output AC voltage.
[0013] According to some embodiments of the present application, the voltage generating module also includes a voltage output indication unit, which includes a second resistor and a first LED tube, the first end of the second resistor is connected to the second output end of the first voltage conversion unit, the second end of the second resistor is connected to the input end of the first LED tube, and the output end of the first LED tube is connected to the output end of the control switch.
[0014] According to some embodiments of the present application, the voltage output indication unit further includes a first capacitor, a first end of the first capacitor is connected to a first end of the second resistor, and a second end of the first capacitor is connected to an output end of the first LED tube.
[0015] According to some embodiments of the present application, the voltage output indication unit also includes a first diode, an input end of the first diode is connected to the second output end of the first voltage conversion unit, an output end of the first diode is connected to the first end of the second resistor, and the first diode is used to rectify, limit and stabilize the circuit where the first LED tube is located.
[0016] According to some embodiments of the present application, the voltage output indication unit also includes a third resistor, a first end of the third resistor is connected to the output end of the first diode, a second end of the third resistor is connected to the first end of the second resistor, and the third resistor is used to limit the current flowing through the first LED tube.
[0017] According to some embodiments of the present application, the adjustable current generating circuit also includes a closing and opening indication module, which includes a rectifier unit, a closing indication unit, an opening indication unit and a through-wall terminal. The closing indication unit is used to simulate that the circuit is in a closed state, and the opening indication unit is used to simulate that the circuit is in an open state. The first end of the rectifier unit is connected to the output end of the second voltage conversion unit, the second end of the rectifier unit is connected to the first end of the through-wall terminal, the first end of the closing indication unit is connected to the second end of the through-wall terminal, the second end of the closing indication unit is connected to the first end of the through-wall terminal and to the ground, the first end of the opening indication unit is connected to the third end of the through-wall terminal, the second end of the opening indication unit is connected to the ground, and the through-wall terminal is used for an external wire or power supply.
[0018] According to some embodiments of the present application, the rectifier unit includes a rectifier bridge, a second capacitor and a second diode, the first input end of the rectifier bridge is connected to the first output end of the second voltage conversion unit, the second input end of the rectifier bridge is connected to the second output end of the second voltage conversion unit, the positive output end of the rectifier bridge is connected to the input end of the second diode and to the first end of the second capacitor, the negative output end of the rectifier bridge is connected to the ground end and to the second end of the second capacitor, and the output end of the second diode is connected to the first end of the through-wall terminal;
[0019] The closing indication unit includes a fourth resistor, a second LED tube, a third capacitor and a third diode, wherein a first end of the fourth resistor is connected to a second end of the through-wall terminal, a second end of the fourth resistor is connected to an input end of the second LED tube, an output end of the second LED tube is connected to an input end of the third diode and to a ground end, an output end of the third diode is connected to a first end of the through-wall terminal, a first end of the third capacitor is connected to an input end of the second LED tube, and a second end of the third capacitor is connected to an output end of the second LED tube;
[0020] The gate opening indication unit includes a fifth resistor, a third LED tube and a fourth capacitor, the first end of the fifth resistor is connected to the third end of the through-wall terminal, the second end of the fifth resistor is connected to the input end of the third LED tube, the output end of the third LED tube is connected to the ground, the first end of the fourth capacitor is connected to the input end of the third LED tube, and the second end of the fourth capacitor is connected to the output end of the third LED tube.
[0021] The present application is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 A circuit diagram of an embodiment of the current adjustable generating circuit of the present application;
[0023] Figure 2 A circuit diagram of a voltage output unit of an embodiment of the current adjustable generating circuit of the present application;
[0024] Figure 3 A circuit diagram of a current generating module of an embodiment of the adjustable current generating circuit of the present application;
[0025] Figure 4 A circuit diagram of a voltage output indicating unit of an embodiment of the current adjustable generating circuit of the present application;
[0026] Figure 5 This is a circuit diagram of an opening and closing indication module of an embodiment of the adjustable current generating circuit of the present application.
[0027] Reference numerals:
[0028] A voltage generating module 100, a first voltage converting unit 110, a second voltage converting unit 120, a voltage output unit 130, a voltage output indicating unit 140,
[0029] Current generating module 200,
[0030] The opening and closing indication module 300 , the rectifier unit 310 , the closing indication unit 320 , and the opening indication unit 330 . DETAILED DESCRIPTION
[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.
[0032] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, and right, and the orientation or positional relationship indicated are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0033] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0034] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.
[0035] The embodiments of the present application are further described below in conjunction with the accompanying drawings.
[0036] Reference Figure 1As shown, the current adjustable generating circuit includes a voltage generating module 100 and a current generating module 200. The voltage generating module 100 includes a first voltage conversion unit 110 and a second voltage conversion unit 120, wherein the first voltage conversion unit 110 is used to convert an external input voltage into a first AC voltage and output it, and the second voltage conversion unit 120 is used to convert an external input voltage into a second AC voltage; the current generating module 200 includes a switching switch, a shunt branch and a first output terminal, wherein the input end of the switching switch is connected to the first output end of the second voltage conversion unit 120, the shunt branch is provided with a plurality of switching terminals, and a first resistor is provided between each two adjacent switching terminals, the output end of the switching switch is the same as the number of the first resistor and can be connected to different switching terminals, so that the second AC voltage is connected to one of the switching terminals, the end of the shunt branch is connected to the first end of the first output terminal, the second end of the first output terminal is connected to the second output end of the second voltage conversion unit 120, and the first output terminal is used for an external device to output an AC current.
[0037] In the above embodiment, the external AC voltage is input into the first voltage conversion module and the second voltage conversion module, the first voltage conversion unit converts the external AC voltage into the first AC voltage and outputs it, and the second voltage conversion unit 120 converts the external AC voltage into the second AC voltage. By turning on the switching switch and one of the switching terminals of the shunt branch, the second AC voltage is input into the branch corresponding to the switching terminal through the switching switch, and the second AC voltage passes through the first resistor, and finally outputs an AC current at the end of the branch, and the first output terminal is connected to the external device, so that the AC current flows into the external device. Among them, the switching switch is turned on with different switching terminals, so that the second AC voltage flows through different branches in the shunt branch, and the AC current generated is different due to the difference in the first resistors passed. Therefore, compared with the related art, the circuit structure of the present application is simpler, and a fixed AC voltage can be output, and different AC currents can be output by turning on different switching terminals through the switching switch or flexibly setting the number and resistance of the first resistors in the shunt branch. Therefore, the embodiment of the present application uses a simple circuit structure to generate voltage and current that meet the requirements, reducing the testing cost.
[0038] For example, Figure 1As shown, the embodiment of the present application uses an R-type transformer to step down the external input AC voltage and convert it into a first AC voltage and a second AC voltage for output. One end of the R-type transformer in the figure is a power supply, and the other end is a first voltage conversion unit 110 and a second voltage conversion unit 120. The first voltage conversion unit 110 in the figure is T2, and there are two second voltage conversion units 120 in the embodiment of the present application, namely T3 and T4 in the figure. T2 converts the external input 220V AC voltage into a 110V AC voltage; T3 or T4 converts the external input 220V AC voltage into a 5V AC voltage. Therefore, the first AC voltage is 110V, and the second AC voltage is 5V.
[0039] The embodiment of the present application does not limit the number of the second voltage conversion unit 120 and the current generating module 200, and those skilled in the art may adjust it according to the actual situation. The second voltage conversion unit 120 and the current generating module 200 are set in a one-to-one correspondence. For example, Figure 1 , 3As shown, two second voltage conversion units 120 and two current generating modules 200 are set as an example. The switching switch of one current generating module 200 is SW5, the first resistors corresponding to the module are R13, R14, R15, R16, and the resistance values are respectively set to 4.7Ω, 1Ω, 1Ω, 3Ω, the first output terminal corresponding to the module is J9, and the switching terminals corresponding to the module are I1, I2, I3, and I4; the switching switch of the other current generating module 200 is SW6, the first resistors corresponding to the module are R17, R18, R19, R20, and the resistance values are respectively set to 4.7Ω, 1Ω, 1Ω, 3Ω, the first output terminal corresponding to the module is J10, and the switching terminals corresponding to the module are I5, I6, I7, and I8. Taking the current generating module 200 where T3 and SW5 are located as an example, the input end of SW5 is connected to the 5V1-1 end of T3, the four output ends of SW5 are respectively connected to the I1, I2, I3, and I4 ends, the end of the shunt branch is electrically connected to the first end of J9, and the second end of J9 is connected to the IA end of T3. When J9 is connected to an external device, SW5 is controlled to conduct T3 and the I1 end, so that the second AC voltage is input into the shunt branch from the I1 end, and the first resistor through which the second AC voltage flows includes R13, R14, R15, and R16. Finally, the AC current is output from J9 and input into the external device. At this time, the value of the output AC current is 5V divided by the sum of the resistance values of R13, R14, R15, and R16, that is, 0.5A. When SW5 is controlled to conduct T3 and I2, the output AC current value is 5V divided by the sum of the resistance values of R14, R15, and R16, that is, 0.94A; when SW5 is controlled to conduct T3 and I3, the output AC current value is 5V divided by the sum of the resistance values of R15 and R16, that is, 1.16A; when SW5 is controlled to conduct T3 and I4, the output AC current value is the ratio of 5V to the resistance value of R16, that is, 1.51A. The same is true for T4 and the corresponding current generating module 200. Therefore, by controlling the switching switch to conduct the second voltage switching unit and different switching terminals so that the second AC voltage passes through different branches, different AC currents can be output.
[0040] Understandably, referring to Figure 3 As shown, the current generating module 200 also includes a detection terminal, a first end of the detection terminal is connected to the end of the shunt branch, a second end of the detection terminal is connected to the first end of the first output terminal, and the detection terminal is used to connect an external ammeter. By providing a detection terminal for connecting an external ammeter, the AC current value output by the current generating module 200 can be monitored.
[0041] For example, Figure 3As shown, the detection terminal corresponding to the current generating module 200 corresponding to the switching switch SW5 is DL1 in the figure, and the detection terminal corresponding to the current generating module 200 corresponding to the switching switch SW6 is DL2 in the figure. Taking the current generating module 200 corresponding to the detection terminal DL1 as an example, the first end of DL1 is connected to the end of the shunt branch, and the second end of DL1 is connected to the first end of J9. When DL1 is connected to the ammeter, the AC current flows from DL1 into the ammeter, so that the ammeter displays the value of the AC current, and therefore, the AC current output from the shunt branch can be monitored.
[0042] Understandably, referring to Figure 1 As shown, the voltage generating module 100 further includes a voltage output unit 130, and an input end of the voltage output unit 130 is connected to an output end of the first voltage conversion unit 110. By providing the voltage output unit 130, the voltage generating module 100 can output an AC voltage.
[0043] The embodiment of the present application does not limit the number of voltage output units 130, and those skilled in the art may adjust it according to actual application scenarios. Figure 1 , 2 As shown, three voltage output units 130 are set as an example. The first ends of the three voltage output units 130 are all connected to the L end of the first voltage conversion unit 110, and the second ends of the three voltage output units 130 are all connected to the N end of the first voltage conversion unit 110. Those skilled in the art can choose to connect one, two or three of the voltage output units 130 to an external device and control them to be connected to the external device according to actual needs. Taking the selection of three voltage output units 130 to be connected to an external device and controlling them to be connected to the external device as an example, at this time, the first AC voltage is input from the first voltage conversion unit 110 to the three voltage output units 130, and the first AC voltage is output from the three voltage output units 130 and input to three external devices.
[0044] Understandably, referring to Figure 1 , 2 As shown, the voltage output unit 130 includes a control switch and a second output terminal, the input end of the control switch is connected to the first output end of the first voltage conversion unit 110, the output end of the control switch is connected to the first end of the second output terminal, the second end of the second output terminal is connected to the second output end of the first voltage conversion unit 110, and the second output terminal is used for an external device to output an AC voltage. By setting the control switch, the voltage output unit 130 has the ability to turn on or off the AC voltage output.
[0045] For example, Figure 1 , 2As shown, the control switch of one voltage output unit 130 is SW1, and the second output terminal corresponding to the unit is J7; the control switch of another voltage output unit 130 is SW2, and the second output terminal corresponding to the unit is J8; the control switch of the third voltage output unit 130 is SW3, and the second output terminal corresponding to the unit is J9. Taking the voltage output unit 130 where SW1 and J7 are located as an example, when T2 is connected to the power supply and J7 is connected to the external device, SW1 is controlled to make T2 and the voltage output unit 130 where SW1 and J7 are located conduct, and the first AC voltage is input from T2 to the voltage output unit 130 where SW1 and J7 are located, and finally output from J7 and input to the external device. In some embodiments, F1, F2 and F3 in the figure are fuses. Setting the fuse can protect the connected external device. When the first AC voltage is too large, the fuse blows to prevent the excessive first AC voltage from being input to the external device and damaging the external device.
[0046] Understandably, referring to Figure 1 , 2 As shown in , 4, the voltage generating module 100 further includes a voltage output indicating unit 140, which includes a second resistor and a first LED tube, wherein the first end of the second resistor is connected to the second output end of the first voltage converting unit 110, the second end of the second resistor is connected to the input end of the first LED tube, and the output end of the first LED tube is connected to the output end of the control switch. By providing the voltage output indicating unit 140 including the second resistor and the first LED tube, the output state of the AC voltage of the voltage output unit 130 can be monitored.
[0047] For example, Figure 1 , 2, 4. There are three corresponding voltage output indicating units 140, wherein the second resistor of one voltage output indicating unit 140 is R4 in the figure, and the first LED tube corresponding to the unit is LED1; the second resistor of another voltage output indicating unit 140 is R8 in the figure, and the first LED tube corresponding to the unit is LED2; the second resistor of the third voltage output indicating unit 140 is R12 in the figure, and the first LED tube corresponding to the unit is LED3. Take the voltage output indicating unit 140 where R4 and LED1 are located as an example. The first end of R4 is connected to the L1 end, the second end of R4 is connected to the input end of LED1, and the output end of LED1 is connected to the N end of T1. Control SW1 to turn on the voltage output indication unit 140 where T1, R4 and LED1 are located, and the AC current flows through LED1, causing LED1 to light up, thereby indicating that the voltage output unit 130 is in a state of outputting the first AC voltage; when control SW1 to disconnect the voltage output indication unit 140 where T1, R4 and LED1 are located, since no AC current flows through LED1, LED1 is turned off, thereby indicating that the voltage output unit 130 is in a disconnected state and is no longer outputting the first AC voltage.
[0048] Understandably, referring to Figure 4 As shown, the voltage output indication unit 140 also includes a first capacitor, a first end of the first capacitor is connected to a first end of the second resistor, and a second end of the first capacitor is connected to an output end of the first LED tube. By setting the first capacitor, the DC voltage passing through the LED 1 can be filtered and voltage fluctuations can be eliminated.
[0049] For example, Figure 4 As shown, the first capacitor corresponding to the voltage output indicating unit 140 where the first LED tube LED1 is located is C1 in the figure; the first capacitor corresponding to the voltage output indicating unit 140 where the first LED tube LED2 is located is C2 in the figure; the first capacitor corresponding to the voltage output indicating unit 140 where the first LED tube LED3 is located is C3 in the figure. Taking the voltage output indicating unit 140 where C1 is located as an example, R4 and LED1 are connected in series, the first end of C1 is connected to the first end of R4, and the second end of C1 is connected to the output end of LED1. C1 can filter the DC voltage passing through LED1 and eliminate voltage fluctuations, so that the light emission of LED1 remains stable.
[0050] Understandably, referring to Figure 4 As shown, the voltage output indication unit 140 also includes a first diode, the input end of the first diode is connected to the second output end of the first voltage conversion unit 110, the output end of the first diode is connected to the first end of the second resistor, and the first diode is used to rectify, limit and stabilize the circuit where the first LED tube is located.
[0051] For example, Figure 4 As shown, the first diode corresponding to the voltage output indicating unit 140 where the first LED tube LED1 is located is D1 in the figure; the first diode corresponding to the voltage output indicating unit 140 where the first LED tube LED2 is located is D2 in the figure; the first diode corresponding to the voltage output indicating unit 140 where the first LED tube LED3 is located is D3 in the figure. Taking the voltage output indicating unit 140 where D1 is located as an example, the input end of D1 is connected to the N end of T2, and the output end of D1 is connected to the first end of R4. D1 can rectify, limit and stabilize the circuit where LED1 is located.
[0052] Understandably, referring to Figure 4 As shown, the voltage output indicating unit 140 also includes a third resistor, a first end of the third resistor is connected to the output end of the first diode, a second end of the third resistor is connected to the first end of the second resistor, and the third resistor is used to limit the current flowing through the first LED tube.
[0053] For example, Figure 4 As shown, the third resistor corresponding to the voltage output indicating unit 140 where the first LED tube LED1 is located is R1, R2, and R3 in the figure; the third resistor corresponding to the voltage output indicating unit 140 where the first LED tube LED2 is located is R5, R6, and R7 in the figure; the third resistor corresponding to the voltage output indicating unit 140 where the first LED tube LED3 is located is R9, R10, and R11 in the figure. Among them, the resistance values of R1, R2, R3, R5, R6, R7, R9, R10, and R11 are all 20KΩ. Taking the voltage output indicating unit 140 where R1, R2, and R3 are located as an example, R1, R2, and R3 are connected in series, the first end of R1 is connected to the output end of D1, and the second end of R3 is connected to the first end of R4. R1, R2, and R3 work together to limit the magnitude of the current flowing through LED1 and reduce the probability of damage to LED1.
[0054] Understandably, referring to Figure 1 , 5As shown, the current adjustable generating circuit also includes a closing and opening indication module 300, which includes a rectifier unit 310, a closing indication unit 320, an opening indication unit 330 and a through-wall terminal. The closing indication unit 320 is used to simulate that the circuit is in a closing state, and the opening indication unit 330 is used to simulate that the circuit is in an opening state. The first end of the rectifier unit 310 is connected to the output end of the second voltage conversion unit 120, the second end of the rectifier unit 310 is connected to the first end of the through-wall terminal, the first end of the closing indication unit 320 is connected to the second end of the through-wall terminal, the second end of the closing indication unit 320 is connected to the first end of the through-wall terminal and to the ground, the first end of the opening indication unit 330 is connected to the third end of the through-wall terminal, the second end of the opening indication unit 330 is connected to the ground, and the through-wall terminal is used for externally connecting a wire or a power supply. By setting the rectifier unit 310, the closing indication unit 320, and the opening indication unit 330, the simulation of the closing and opening state of the circuit can be realized.
[0055] Understandably, referring to Figure 1 , 5 As shown, the rectifier unit 310 includes a rectifier bridge, a second capacitor and a second diode, the first input end of the rectifier bridge is connected to the first output end of the second voltage conversion unit 120, the second input end of the rectifier bridge is connected to the second output end of the second voltage conversion unit 120, the positive output end of the rectifier bridge is connected to the input end of the second diode and to the first end of the second capacitor, the negative output end of the rectifier bridge is connected to the ground end and to the second end of the second capacitor, and the output end of the second diode is connected to the first end of the through-wall terminal;
[0056] The closing indication unit 320 includes a fourth resistor, a second LED tube, a third capacitor and a third diode, wherein a first end of the fourth resistor is connected to a second end of the through-wall terminal, a second end of the fourth resistor is connected to an input end of the second LED tube, an output end of the second LED tube is connected to an input end of the third diode and to a ground end, an output end of the third diode is connected to a first end of the through-wall terminal, a first end of the third capacitor is connected to an input end of the second LED tube, and a second end of the third capacitor is connected to an output end of the second LED tube;
[0057] The trip indication unit 330 includes a fifth resistor, a third LED tube and a fourth capacitor, the first end of the fifth resistor is connected to the third end of the through-wall terminal, the second end of the fifth resistor is connected to the input end of the third LED tube, the output end of the third LED tube is connected to the ground, the first end of the fourth capacitor is connected to the input end of the third LED tube, and the second end of the fourth capacitor is connected to the output end of the third LED tube.
[0058] For example, Figure 1 , 5As shown, the through-wall terminal is J6, the first end, the second end, and the third end of the through-wall terminal are COM, HZ, and FZ respectively, the rectifier bridge is MB6F, the second capacitors are C6 and C7, the second diode is D5, the fourth resistor is R22, the second LED tube is LED6, the third capacitor is C5, the third diode is D4, the fifth resistor is R21, the third LED tube is LED5, and the fourth capacitor is C4. The first input end of MB6F is connected to the 5V1-1 end of T3, the second input end of MB6F is connected to the IA end of T3, the positive output end of MB6F is connected to the input end of D5, the negative output end of MB6F is connected to the ground end, and the output end of D5 is connected to the COM end. The first ends of C6 and C7 are connected to the input end of D5, and the second ends of C6 and C7 are connected to the ground end; the first end of R22 is connected to the HZ end, the second end of R22 is connected to the input end of LED6, the output end of LED6 is connected to the ground end, the first end of C5 is connected to the input end of LED6, the second end of C5 is connected to the output end of LED6, the input end of D4 is connected to the output end of LED6, and the output end of D4 is connected to the COM end; the first end of R21 is connected to the FZ end, the second end of R21 is connected to the input end of LED5, the output end of LED5 is connected to the ground end, the first end of C4 is connected to the input end of LED5, and the second end of C4 is connected to the output end of LED5. MB6F rectifies the 5V AC output of T3 into 7V DC for output. When the COM terminal and the HZ terminal are short-circuited with a wire, the 7V DC current passes through LED6, causing LED6 to light up, indicating that the internal power supply is in the closed state; when the positive and negative poles of the 24V DC power supply are connected to the HZ terminal and the COM terminal respectively, the 24V DC current in the 24V AC power supply passes through LED6, causing LED6 to light up, indicating that the external 24V DC power supply is in the closed state.
[0059] The embodiments of the present application have been described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.
Claims
1. A current adjustable generating circuit, comprising: A voltage generating module, the voltage generating module comprising a first voltage conversion unit and a second voltage conversion unit, the first voltage conversion unit is used to convert an external input voltage into a first AC voltage and output it, the second voltage conversion unit is used to convert the external input voltage into a second AC voltage, characterized in that the current adjustable generating circuit also includes: A current generating module, the current generating module includes a switching switch, a shunt branch and a first output terminal, the input end of the switching switch is connected to the first output end of the second voltage conversion unit, the shunt branch is provided with a plurality of switching terminals, a first resistor is provided between each two adjacent switching terminals, the output end of the switching switch is the same as the number of the first resistors and can be connected to different switching terminals so that the second AC voltage is connected to one of the switching terminals, the end of the shunt branch is connected to the first end of the first output terminal, the second end of the first output terminal is connected to the second output end of the second voltage conversion unit, and the first output terminal is used for an external device to output AC current.
2. The current adjustable generating circuit according to claim 1, characterized in that: The current generating module further comprises a detection terminal, a first end of the detection terminal is connected to the end of the shunt branch, a second end of the detection terminal is connected to the first end of the first output terminal, and the detection terminal is used for externally connecting an ammeter.
3. The current adjustable generating circuit according to claim 1, characterized in that: The voltage generating module further includes a voltage output unit, an input end of the voltage output unit is connected to an output end of the first voltage converting unit.
4. The current adjustable generating circuit according to claim 3, characterized in that: The voltage output unit includes a control switch and a second output terminal, the input end of the control switch is connected to the first output end of the first voltage conversion unit, the output end of the control switch is connected to the first end of the second output terminal, the second end of the second output terminal is connected to the second output end of the first voltage conversion unit, and the second output terminal is used for an external device to output an AC voltage.
5. The current adjustable generating circuit according to claim 4, characterized in that: The voltage generating module also includes a voltage output indicating unit, which includes a second resistor and a first LED tube, wherein the first end of the second resistor is connected to the second output end of the first voltage conversion unit, the second end of the second resistor is connected to the input end of the first LED tube, and the output end of the first LED tube is connected to the output end of the control switch.
6. The current adjustable generating circuit according to claim 5, characterized in that: The voltage output indicating unit further includes a first capacitor, a first end of the first capacitor is connected to a first end of the second resistor, and a second end of the first capacitor is connected to an output end of the first LED tube.
7. The current adjustable generating circuit according to claim 6, characterized in that: The voltage output indication unit also includes a first diode, an input end of the first diode is connected to the second output end of the first voltage conversion unit, an output end of the first diode is connected to the first end of the second resistor, and the first diode is used to rectify, limit and stabilize the circuit where the first LED tube is located.
8. The current adjustable generating circuit according to claim 7, characterized in that: The voltage output indicating unit further includes a third resistor, a first end of the third resistor is connected to the output end of the first diode, a second end of the third resistor is connected to the first end of the second resistor, and the third resistor is used to limit the current flowing through the first LED tube.
9. The current adjustable generating circuit according to claim 1, characterized in that: The adjustable current generating circuit also includes a closing and opening indication module, which includes a rectifier unit, a closing indication unit, an opening indication unit and a through-wall terminal. The closing indication unit is used to simulate that the circuit is in a closed state, and the opening indication unit is used to simulate that the circuit is in an open state. The first end of the rectifier unit is connected to the output end of the second voltage conversion unit, the second end of the rectifier unit is connected to the first end of the through-wall terminal, the first end of the closing indication unit is connected to the second end of the through-wall terminal, the second end of the closing indication unit is connected to the first end of the through-wall terminal and to the ground, the first end of the opening indication unit is connected to the third end of the through-wall terminal, the second end of the opening indication unit is connected to the ground, and the through-wall terminal is used for an external wire or power supply.
10. The current adjustable generating circuit according to claim 9, characterized in that: The rectifier unit includes a rectifier bridge, a second capacitor and a second diode, a first input end of the rectifier bridge is connected to a first output end of the second voltage conversion unit, a second input end of the rectifier bridge is connected to a second output end of the second voltage conversion unit, a positive output end of the rectifier bridge is connected to an input end of the second diode and to a first end of the second capacitor, a negative output end of the rectifier bridge is connected to a ground end and to a second end of the second capacitor, and an output end of the second diode is connected to a first end of the through-wall terminal; The closing indication unit includes a fourth resistor, a second LED tube, a third capacitor and a third diode, wherein a first end of the fourth resistor is connected to a second end of the through-wall terminal, a second end of the fourth resistor is connected to an input end of the second LED tube, an output end of the second LED tube is connected to an input end of the third diode and to a ground end, an output end of the third diode is connected to a first end of the through-wall terminal, a first end of the third capacitor is connected to an input end of the second LED tube, and a second end of the third capacitor is connected to an output end of the second LED tube; The gate opening indication unit includes a fifth resistor, a third LED tube and a fourth capacitor, the first end of the fifth resistor is connected to the third end of the through-wall terminal, the second end of the fifth resistor is connected to the input end of the third LED tube, the output end of the third LED tube is connected to the ground, the first end of the fourth capacitor is connected to the input end of the third LED tube, and the second end of the fourth capacitor is connected to the output end of the third LED tube.