CN215646628U - Low-voltage cabinet AC-DC conversion device - Google Patents
Low-voltage cabinet AC-DC conversion device Download PDFInfo
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- CN215646628U CN215646628U CN202121336994.6U CN202121336994U CN215646628U CN 215646628 U CN215646628 U CN 215646628U CN 202121336994 U CN202121336994 U CN 202121336994U CN 215646628 U CN215646628 U CN 215646628U
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Abstract
The utility model discloses an AC-DC conversion device of a low-voltage cabinet, which relates to the field of power supply voltage conversion and comprises an AC power distribution cabinet module, an AC-DC conversion module, an AC control module, an output sampling module, an output protection module and a control switch module; the AC-DC conversion module is used for performing AC-DC conversion, the AC control module is used for changing an AC voltage value, outputting a DC voltage signal output by the detection circuit for the sampling module, the output protection module is used for switching off the device, and the control switch module is used for receiving the output voltage signal and controlling the working states of the output protection module and the AC control module. The AC-DC conversion device of the low-voltage cabinet adopts the integrated circuit to intelligently sample and control the circuit output, changes the conversion voltage by changing the transformer, and can effectively convert the overhigh voltage output by the old transformer into the required lower direct-current voltage by utilizing the switching tube, thereby effectively improving the safety of the circuit and ensuring the feasibility of alternating-current and direct-current conversion.
Description
Technical Field
The utility model relates to the field of power supply voltage conversion, in particular to an AC-DC conversion device of a low-voltage cabinet.
Background
Along with the continuous improvement of people's domestic water, the performance of consumer has also obtained very big optimization, current alternating current-direct current converting circuit is at practical in-process, unstable on the continuity of 220V alternating current break-make, and very easy the appearance is unusual in receiving load current, lead to output voltage to appear floating phenomenon, cause the damage to the consumer, and the traditional conversion mode that changes output voltage all is through simple three terminal regulator to adjust output voltage to required direct current voltage, this kind of method is simply used, but consumed a part of output power, lead to exporting extravagantly, and still need additionally to increase cooling system, cause unnecessary trouble for the circuit.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an AC-DC conversion device for a low voltage cabinet, which is used for solving the problems in the background art.
According to a first aspect of embodiments of the present invention, there is provided a low-voltage-tank AC-DC conversion apparatus, including: the device comprises an alternating current power distribution cabinet module, an AC-DC conversion module, an alternating current control module, an output sampling module, an output protection module and a control switch module;
the alternating current power distribution cabinet module is used for outputting alternating current voltage by the power distribution cabinet;
the AC-DC conversion module is used for carrying out AC-DC conversion on the alternating current output by the alternating current power distribution cabinet module;
the alternating current control module is used for changing the alternating current voltage value of the AC-DC conversion module;
the output sampling module is used for sampling the direct-current voltage signal output by the AC-DC conversion module;
the output protection module is used for protecting the low-voltage cabinet AC-DC conversion device from overlarge voltage output by the AC-DC conversion module;
the control switch module is used for receiving the direct-current voltage signal sampled by the output sampling module, controlling the working state of the output protection module and controlling the working state of the alternating-current control module.
Compared with the prior art, the utility model has the beneficial effects that: the AC-DC conversion device of the low-voltage cabinet adopts the integrated circuit to intelligently sample and control the circuit output, and can effectively convert the overhigh voltage output by the old transformer into the required lower direct-current voltage by changing the transformer as the safety guarantee of the first voltage output and utilizing the switching tube as the second guarantee of the circuit safety, thereby effectively improving the safety of the circuit and ensuring the feasibility of alternating-current and direct-current conversion.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of an AC-DC conversion device of a low voltage cabinet according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a low-voltage cabinet AC-DC conversion device provided by an embodiment of the utility model.
Fig. 3 is a circuit diagram of an output sampling module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a low-voltage cabinet AC-DC conversion apparatus, including: the system comprises an alternating current power distribution cabinet module 1, an AC-DC conversion module 2, an alternating current control module 3, an output sampling module 4, an output protection module 5 and a control switch module 6;
specifically, the ac distribution cabinet module 1 is used for the distribution cabinet to output ac voltage;
the AC-DC conversion module 2 is used for carrying out AC-DC conversion on the alternating current output by the alternating current power distribution cabinet module 1;
the alternating current control module 3 is used for changing the alternating current voltage value of the AC-DC conversion module 2;
the output sampling module 4 is used for sampling the direct-current voltage signal output by the AC-DC conversion module 2;
the output protection module 5 is used for protecting the low-voltage cabinet AC-DC conversion device from the overlarge voltage output by the AC-DC conversion module 2;
and the control switch module 6 is used for receiving the direct-current voltage signal sampled by the output sampling module 4, controlling the working state of the output protection module 5 and controlling the working state of the alternating-current control module 3.
In a specific embodiment, the ac power distribution cabinet module 1 selects a low-voltage power distribution cabinet as an ac power supply, which is not described herein again; the AC-DC conversion module 2 performs AC-DC conversion through a transformer rectifier T and a filter C, wherein the filter C can adopt an RC filter C or a pi-type filter C to perform filtering processing on the rectified voltage; the AC control module 3 may adopt a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or a Silicon Controlled Rectifier (SCR), and selects a transformer transformation value of an AC-DC (Alternating Current-Direct Current) conversion module by controlling the conduction of the switching tube; the output sampling module 4 can adopt a resistance voltage division type or a voltage sensor to detect the output voltage of the AC-DC conversion module 2; the control switch module 6 may adopt a single chip or a Central Processing Unit (CPU) to receive the DC voltage signal, and control the AC-DC conversion module 2 and the DC-DC conversion module according to an internal software system.
Example 2: on the basis of embodiment 1, please refer to fig. 2, in an embodiment of the AC-DC conversion apparatus for low voltage cabinet according to the present invention, the AC distribution cabinet module 1 includes a low voltage cabinet AC; the AC-DC conversion module 2 includes a first transformer W1, an auxiliary transformer W2, a rectifier T and a filter C;
specifically, a first end of the low-voltage cabinet AC is connected to a first end of a first transformer W1, a second end of the low-voltage cabinet AC is connected to a second end of a first transformer W1, a third end of the first transformer W1 is connected to a first end of a rectifier T through a first end of the AC control module 3, a fourth end of the first transformer W1 is connected to a first end of an auxiliary transformer W2, a fourth end of the first transformer W1 is connected to a first end of the rectifier T through a second end of the AC control module 3, a second end of the auxiliary transformer W2 is connected to a third end of the rectifier T, and a second end and a fourth end of the rectifier T are connected to a filter C.
Further, the ac control module 3 includes a first switch tube S1 and a second switch tube S2; the control switch module 6 comprises a first controller U1;
specifically, a first terminal of the first switching tube S1 is connected to the third terminal of the first transformer W1, a second terminal of the first transformer W1 is connected to the first terminal of the rectifier T and the second terminal of the second switching tube S2, a third terminal of the first switching tube S1 is connected to the third terminal of the first controller U1, a first terminal of the second switching tube S2 is connected to the fourth terminal of the first transformer W1, and a third terminal of the second switching tube S2 is connected to the fourth terminal of the first controller U1.
Further, the output protection module 5 includes a first switch control unit 501 and a second switch control unit 502;
a first switch control unit 501 for changing an output direct-current voltage of the AC-DC conversion module 2;
a second switch control unit 502, configured to control a working state of the first switch control unit 501;
a first end of the first switch control unit 501 is connected to the output end of the AC-DC conversion module 2, and a second end of the first switch control unit 501 is connected to the third end of the control switch module 6 through the second switch control unit 502.
Further, the first switch control unit 501 includes a first diode D1, a third diode D3, a second regulator tube DV2, a first capacitor C1, a third resistor R3, a second capacitor C2, and a third switch tube M1; the second switch control unit 502 comprises a first voltage regulator DV1, a first resistor R1, a second resistor R2, a second diode D2, a fourth resistor R4 and a fourth switch tube N1;
specifically, the anode of the first diode D1 is connected to the fourth end of the rectifier T and the first end of the third switching tube M1, the cathode of the first diode D1 is connected to the first capacitor C1 and the third resistor R3, the other end of the third resistor R3 is connected to the second regulator DV2 and the third end of the third switching tube M1, the second end of the third switching tube M1 is connected to the cathode of the second regulator DV2 and the anode of the third diode D3, the cathode of the third diode D3 is connected to the second capacitor C2, the cathode of the first regulator DV1 is connected to the anode of the first diode D1, the anode of the first regulator 1 is connected to the first resistor R1 and the second resistor R2, the other end of the second resistor R2 is connected to the third end of the third switching tube M1 and the cathode of the second diode D2, the first end of the third switching tube M1 is connected to the other end of the third resistor R3, the first end of the first resistor R1 and the second end of the first resistor R1, an anode of the second diode D2 is connected to a first terminal of the first controller U1 through a fourth resistor R4.
In a specific embodiment, the first controller U1 may be a single chip microcomputer capable of collecting and controlling circuit information, and may be a 51 single chip microcomputer or an STM32 series single chip microcomputer, and the single chip microcomputer receives data detected by the output sampling module 4 and judges the data through an internal software system, so as to preferentially control the operation of the first switch tube S1 and the second switch tube S2 or select the first switch tube S1 and the second switch tube S2 through keys on the single chip microcomputer; the rectifier T adopts a full-bridge rectification mode, and the filter C can adopt a pi-type filter C; the fourth switching tube N1 is an NPN type triode 2N4401 or 2N4402, and the third switching tube M1 is controlled to operate by switching off the triode, so that the automatic protection circuit prevents overvoltage.
Example 3: on the basis of embodiment 1, referring to fig. 3, in an embodiment of the AC-DC conversion apparatus for low voltage cabinet according to the present invention, the output sampling module 4 includes a sampling unit 401, a voltage following unit 402 and a voltage comparing unit 403;
specifically, the sampling unit 401 is configured to sample a direct-current voltage signal output by the AC-DC conversion module 2;
a voltage follower unit 402 for isolating the influence of the input voltage and the output voltage to serve as a buffer stage;
a voltage comparison unit 403, configured to compare the dc voltage signal of the sampling unit 401 with a required voltage signal;
a first end of the sampling unit 401 is connected to the output end of the AC-DC conversion module 2, a second end of the sampling unit 401 is connected to a first end of a voltage comparison unit 403 through a voltage following unit 402, and a second end of the voltage comparison unit 403 is connected to the control switch module 6.
Further, the sampling unit 401 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a third capacitor C3; the voltage follower unit 402 comprises a first operational amplifier a 1; the voltage comparison unit 403 comprises a second operational amplifier A2, an eighth resistor R8, a ninth resistor R9, a first voltage source +6V and a fourth capacitor C4;
specifically, a first end of the fifth resistor R5 is connected to the fourth end of the rectifier T, a second end of the fifth resistor R5 is connected to a first end of the seventh resistor R7, one end of the third capacitor C3 and the same-phase end of the first operational amplifier a1 through the sixth resistor R6, an inverting end of the first operational amplifier a1 is connected to the output end of the first operational amplifier a1, an inverting end of the second operational amplifier a2 is connected to the output end of the first operational amplifier a1, the same-phase end of the second operational amplifier a2 is connected to the first voltage source +6V through the eighth resistor R8, the same-phase end of the second operational amplifier a2 is connected to the output end of the second operational amplifier a2, and is connected to the fourth capacitor C4 and the second end of the first controller U1 through the ninth resistor R9, and the other end of the fourth capacitor C4 is connected to the ground, the other end of the third capacitor C3 and the other end of the seventh resistor R7.
In a specific embodiment, the first operational amplifier a1 selects the high-precision operational amplifier LM358 or OPA2333 to form a voltage follower as a buffer stage, so as to improve the interference rejection capability, and the same second operational amplifier a2 also selects the LM358 and the OPA2333 to implement a hysteresis comparator by matching peripheral elements, so as to compare the DC voltage converted by the AC-DC conversion module 2.
In the embodiment of the utility model, the low-voltage cabinet AC performs AC-AC conversion through the first transformer W1, then the AC is rectified into dc through the rectifier T, and then the dc is filtered by the filter C to output smooth dc, when the voltage is normal, the first diode and the first capacitor C1 provide a gate bias voltage for the third switching tube M1, the bias current keeps the third switching tube M1 in a conducting state, the output sampling module 4 performs voltage division detection through the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7, the voltage follower formed by the first operational amplifier a1 enhances the processing of signals, the hysteresis comparator formed by the second operational amplifier a2 is used for comparing the output voltage, the high voltage setting voltage enables the second operational amplifier a2 to output a high level to the first controller U1, the first controller U1 controls the first switching tube S1 to be opened, and the second switching tube S2 to be closed, the auxiliary transformer W2 is used for converting alternating current voltage, the reduced output voltage of the transformer is changed, when the voltage signal detected by the output sampling module 4 is still higher than the required voltage, the output voltage can break through the first voltage-regulator tube DV1 to control the fourth switching tube N1 to be switched on, the third switching tube M1 is switched off, the circuit stops running, and if the circuit needs to be manually switched off, a logic high level can be input through the first controller U1 through the fourth resistor R4 and the second diode.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. An AC-DC conversion device of a low-voltage cabinet is characterized in that:
the low-voltage cabinet AC-DC conversion device comprises: the device comprises an alternating current power distribution cabinet module, an AC-DC conversion module, an alternating current control module, an output sampling module, an output protection module and a control switch module;
the alternating current power distribution cabinet module is used for outputting alternating current voltage by the power distribution cabinet;
the AC-DC conversion module is used for carrying out AC-DC conversion on the alternating current output by the alternating current power distribution cabinet module;
the alternating current control module is used for changing the alternating current voltage value of the AC-DC conversion module;
the output sampling module is used for sampling the direct-current voltage signal output by the AC-DC conversion module;
the output protection module is used for protecting the low-voltage cabinet AC-DC conversion device from overlarge voltage output by the AC-DC conversion module;
the control switch module is used for receiving the direct-current voltage signal sampled by the output sampling module, controlling the working state of the output protection module and controlling the working state of the alternating-current control module.
2. The low-voltage cabinet AC-DC conversion device according to claim 1, wherein the AC distribution cabinet module comprises a low-voltage cabinet; the AC-DC conversion module comprises a first transformer, an auxiliary transformer, a rectifier and a filter circuit;
the first end of the low-voltage cabinet is connected with the first end of the first transformer, the second end of the low-voltage cabinet is connected with the second end of the first transformer, the third end of the first transformer is connected with the first end of the rectifier through the first end of the alternating current control module, the fourth end of the first transformer is connected with the first end of the auxiliary transformer, the fourth end of the first transformer is connected with the first end of the rectifier through the second end of the alternating current control module, the second end of the auxiliary transformer is connected with the third end of the rectifier, and the second end and the fourth end of the rectifier are connected with the filter circuit.
3. The low-voltage cabinet AC-DC conversion device according to claim 2, wherein the AC control module comprises a first switch tube and a second switch tube; the control switch module comprises a first controller;
the first end of the first switch tube is connected with the third end of the first transformer, the second end of the first transformer is connected with the first end of the rectifier and the second end of the second switch tube, the third end of the first switch tube is connected with the third end of the first controller, the first end of the second switch tube is connected with the fourth end of the first transformer, and the third end of the second switch tube is connected with the fourth end of the first controller.
4. The low-voltage cabinet AC-DC conversion device according to claim 3, wherein the output sampling module comprises a sampling unit, a voltage following unit and a voltage comparison unit;
the sampling unit is used for sampling the direct-current voltage signal output by the AC-DC conversion module;
the voltage following unit is used for isolating the influence of the input voltage and the output voltage and used as a buffer stage;
the voltage comparison unit is used for comparing the direct-current voltage signal of the sampling unit with a required voltage signal;
the first end of the sampling unit is connected with the output end of the AC-DC conversion module, the second end of the sampling unit is connected with the first end of the voltage comparison unit through the voltage following unit, and the second end of the voltage comparison unit is connected with the control switch module.
5. The low-voltage cabinet AC-DC conversion device according to claim 2, wherein the output protection module comprises a first switch control unit and a second switch control unit;
the first switch control unit is used for changing the output direct-current voltage of the AC-DC conversion module;
the second switch control unit is used for controlling the working state of the first switch control unit;
the first end of the first switch control unit is connected with the output end of the AC-DC conversion module, and the second end of the first switch control unit is connected with the third end of the control switch module through the second switch control unit.
6. The low-voltage cabinet AC-DC conversion device according to claim 4, wherein the sampling unit comprises a fifth resistor, a sixth resistor, a seventh resistor and a third capacitor; the voltage follower unit comprises a voltage follower; the voltage comparator comprises a first comparator, an eighth resistor, a ninth resistor and a fourth capacitor
The first end of the fifth resistor is connected with the fourth end of the rectifier, the second end of the fifth resistor is connected with the first end of the seventh resistor, one end of the third capacitor and the in-phase end of the voltage follower through the sixth resistor, and the inverting end of the voltage follower is connected with the output end of the voltage follower.
7. The low-voltage cabinet AC-DC conversion device according to claim 5, wherein the inverting terminal of the first comparator is connected to the output terminal of the voltage follower, the non-inverting terminal of the first comparator is connected to the first voltage source through an eighth resistor, and the non-inverting terminal of the first comparator is connected to the output terminal of the first comparator and is connected to the fourth resistor and the second terminal of the first controller through a ninth resistor.
8. The low-voltage cabinet AC-DC conversion device according to claim 5, wherein the first switch control unit comprises a first diode, a second voltage regulator tube, a first capacitor, a third resistor, a third diode, a second capacitor and a third switch tube; the second switch control unit comprises a first voltage regulator tube, a first resistor, a second diode, a fourth resistor and a fourth switch tube;
the anode of the first diode is connected with the fourth end of the rectifier and the first end of the third switching tube, the cathode of the first diode is connected with the first capacitor and the third resistor, the other end of the third resistor is connected with the third ends of the second voltage-stabilizing tube and the third switching tube, the second end of the third switching tube is connected with the cathode of the second voltage-stabilizing tube and the anode of the third diode, and the cathode of the third diode is connected with the second capacitor.
9. The low-voltage cabinet AC-DC conversion device according to claim 8, wherein the cathode of the first voltage regulator tube is connected to the anode of the first diode, the anode of the first voltage regulator tube is connected to the first resistor and the second resistor, the other end of the second resistor is connected to the third terminal of the third switch tube and the cathode of the second diode, the first terminal of the third switch tube is connected to the other end of the third resistor, the second terminal of the third switch tube is grounded and the other end of the first resistor, and the anode of the second diode is connected to the first terminal of the first controller through the fourth capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121336994.6U CN215646628U (en) | 2021-06-16 | 2021-06-16 | Low-voltage cabinet AC-DC conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121336994.6U CN215646628U (en) | 2021-06-16 | 2021-06-16 | Low-voltage cabinet AC-DC conversion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215646628U true CN215646628U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121336994.6U Active CN215646628U (en) | 2021-06-16 | 2021-06-16 | Low-voltage cabinet AC-DC conversion device |
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| CN (1) | CN215646628U (en) |
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- 2021-06-16 CN CN202121336994.6U patent/CN215646628U/en active Active
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