Voltage regulation feedback circuit module, switching power supply and laser cutting system

Abstract

The utility model belongs to the technical field of laser cutting power supply, and particularly provides a voltage regulation feedback circuit module, a switching power supply and a laser cutting system, the module comprises a change-over switch, a first resistor and a second resistor; a normally closed contact of the change-over switch is connected to a voltage output end of an external switching power supply; the normally closed contact of the change-over switch is also connected with a first resistor and a second resistor which are connected in series; a common end of the change-over switch is connected to a feedback voltage input end of an external switching power supply; a normally open contact of the change-over switch is connected to a connection point of the first resistor and the second resistor; one end of the second resistor away from the first resistor is used as an external electric appliance feedback voltage input end. The problem of voltage drop of the direct-current power supply in a long-distance line is solved; therefore, a series of faults caused by the voltage drop problem of the direct-current power supply are solved, and the reliability and the service life of equipment are remarkably improved and prolonged by improving the stability of the output voltage.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply for laser cutting machines, and in particular to a voltage regulation feedback circuit module, a switching power supply and a laser cutting system. Background Art

[0002] The feedback regulation loop of the existing switching power supply includes a voltage regulation circuit connected to a feedback sampling point, which is connected to a voltage regulation control part. The feedback sampling point is used to measure whether the output voltage reaches the regulation target voltage. The voltage regulation circuit is provided with a voltage regulation potentiometer for adjusting the output voltage of the switching power supply. The voltage regulation control part automatically adjusts the output voltage according to the resistance value of the set voltage regulation potentiometer to stabilize the output voltage.

[0003] For example, the display of a laser cutting machine. Due to the long display wiring, the output voltage of the switching power supply drops from 12V to below 12V over long transmission distances. This poor anti-interference capability of the display can easily cause a black screen or flickering. This long-distance voltage drop prevents the output voltage from being achieved when adjusting the switching power supply based on the existing feedback point voltage. The current solution is to manually adjust the switching power supply potentiometer to increase the output voltage until the voltage on the display side reaches 12V. This adjustment method is time-consuming and labor-intensive, with limited precision, and fails to fully utilize the switching power supply's inherent ability to automatically adjust the output voltage based on the feedback point voltage. Summary of the Invention

[0004] Aiming at the problem that the output voltage cannot meet the requirement when adjusting based on the existing feedback point voltage due to long-distance voltage drop, the utility model provides a voltage regulation feedback circuit module, a switching power supply and a laser cutting system.

[0005] In a first aspect, the present invention provides a voltage regulation feedback circuit module, comprising a voltage regulation feedback circuit, wherein the circuit comprises a conversion switch, a first resistor, and a second resistor; a normally closed contact of the conversion switch is connected to a voltage output terminal of an external switching power supply;

[0006] The normally closed contact of the transfer switch is also connected to a first resistor and a second resistor connected in series;

[0007] The common terminal of the transfer switch is connected to the feedback voltage input terminal of the external switching power supply;

[0008] The normally open contact of the transfer switch is connected to the connection point of the first resistor and the second resistor;

[0009] One end of the second resistor away from the first resistor serves as an input end for a feedback voltage of an external electrical appliance.

[0010] As a preferred embodiment of the technical solution of the present utility model, the module further includes a terminal block;

[0011] The voltage regulation feedback circuit is connected to the voltage output terminal and feedback voltage input terminal of the external switching power supply and the electrical appliance through the terminal block.

[0012] This utility model achieves complex voltage regulation functions through a simple circuit design, reducing circuit complexity and cost. Furthermore, when modifying an existing switching power supply, simply disconnect the switching power supply output from the feedback point and connect the terminal block to the switching power supply to be modified, making installation and maintenance more convenient. The feedback voltage input terminal is the feedback point.

[0013] As a preferred embodiment of the technical solution of the present utility model, the terminal block includes a first terminal, a second terminal and a third terminal;

[0014] The normally closed contact of the transfer switch is connected to the first terminal; the first terminal is used to connect to the voltage output end of the switching power supply; the end of the second resistor away from the first resistor is connected to the second terminal; the second terminal is used to connect to an external electrical appliance; the common end of the transfer switch is connected to the third terminal; the third terminal is used to connect to the feedback voltage input end of the switching power supply.

[0015] In a second aspect, the technical solution of the present invention provides a switching power supply, comprising a voltage regulation feedback circuit module as described in the first aspect; the switching power supply is provided with a feedback voltage input terminal and a voltage output terminal; the normally closed contact of the conversion switch is connected to the voltage output terminal; the common terminal of the conversion switch is connected to the feedback voltage input terminal; the voltage output terminal is used to connect to an external electrical appliance to power the electrical appliance.

[0016] As a preferred embodiment of the technical solution of the present utility model, the feedback voltage input terminal is further connected to a voltage regulating circuit;

[0017] The voltage regulating circuit is connected to a voltage regulating control unit;

[0018] As a preferred embodiment of the technical solution of the present utility model, the voltage regulating circuit includes a third resistor, a fourth resistor and a potentiometer;

[0019] A first end of the third resistor is connected to the common end of the conversion switch as a feedback voltage input end;

[0020] The second end of the third resistor is connected to the potentiometer through a fourth resistor;

[0021] The second end of the third resistor is connected to the voltage regulation control unit.

[0022] As a preferred embodiment of the technical solution of the present utility model, the switching power supply further includes a power input terminal, a rectifier unit and a voltage regulating unit;

[0023] The power input terminal is connected to the voltage regulating unit through the rectifier unit;

[0024] The voltage regulating unit is connected to the voltage regulating control unit;

[0025] The voltage regulating unit is also connected to the voltage output terminal.

[0026] As a preferred embodiment of the technical solution of the present utility model, the device further includes a circuit board and a housing; the circuit board is arranged in the housing;

[0027] The rectifier unit, the voltage regulating unit, the voltage regulating control unit and the voltage regulating feedback circuit module are arranged on the circuit board.

[0028] As a preferred embodiment of the technical solution of the utility model, an output terminal, a feedback terminal and a ground terminal are also provided;

[0029] The output terminal is connected to the power output end, the feedback terminal is connected to the end of the second resistor away from the first resistor, the ground terminal is connected to the ground end of the switching power supply, and one end of the power input terminal is connected to the external AC power and the other end is connected to the rectifier unit.

[0030] In a third aspect, the technical solution of the present utility model further provides a laser cutting system, comprising a laser cutting machine display and a switching power supply connected to the laser cutting machine display; the switching power supply is the switching power supply described in the second aspect.

[0031] It can be seen from the above technical solution that the utility model has the following advantages: the voltage regulation feedback circuit module can automatically adjust the feedback amount according to the change of the output voltage through the combination of the conversion switch and the resistor, thereby feeding back the actual voltage on the electrical appliance side to the switching power supply, so that the switching power supply adjusts the output voltage according to the actual voltage on the electrical appliance side, solving the voltage drop problem of the DC power supply in long-distance lines; and thus solving a series of faults caused by the DC power supply voltage drop problem, and significantly improving the reliability and service life of the equipment by improving the stability of the output voltage.

[0032] In addition, the utility model has a reliable design principle, a simple structure and a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 This is a connection diagram of a voltage feedback circuit module according to an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of the application and connection of the voltage feedback circuit module in the embodiment of the present utility model.

[0036] Figure 3 It is a schematic diagram of the switching power supply terminals in the embodiment of the present utility model.

[0037] Figure 4 This is a schematic diagram of the connection of the switching power supply circuit in the embodiment of the present utility model. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0039] like Figure 1 As shown, an embodiment of the present invention provides a voltage regulation feedback circuit module, including a voltage regulation feedback circuit, wherein the circuit includes a transfer switch S1, a first resistor R1, and a second resistor R2; a normally closed contact of the transfer switch S1 is connected to a voltage output terminal of an external switching power supply;

[0040] The normally closed contact of the transfer switch S1 is also connected to a first resistor R1 and a second resistor R2 connected in series;

[0041] The common terminal of the transfer switch S1 is connected to the feedback voltage input terminal of the external switching power supply;

[0042] The normally open contact of the conversion switch S1 is connected to the connection point of the first resistor R1 and the second resistor R2;

[0043] One end of the second resistor R2 away from the first resistor R1 serves as an input end for the feedback voltage of the external electrical appliance.

[0044] In some embodiments, such as Figure 2 As shown, the module further includes a terminal block J1;

[0045] The voltage regulation feedback circuit is connected to the voltage output terminal and feedback voltage input terminal of the external switching power supply and the electrical appliance through the terminal block.

[0046] This utility model achieves complex voltage regulation functions through a simple circuit design, reducing circuit complexity and cost. Furthermore, when modifying an existing switching power supply, simply disconnect the switching power supply output from the feedback point and connect the terminal block to the switching power supply to be modified, making installation and maintenance more convenient. The feedback voltage input terminal is the feedback point.

[0047] It should be noted that the terminal block includes a first terminal, a second terminal and a third terminal;

[0048] The normally closed contact of the transfer switch is connected to the first terminal; the first terminal is used to connect to the voltage output end of the switching power supply; the end of the second resistor away from the first resistor is connected to the second terminal; the second terminal is used to connect to an external electrical appliance; the common end of the transfer switch is connected to the third terminal; the third terminal is used to connect to the feedback voltage input end of the switching power supply.

[0049] like Figure 3 and Figure 4 As shown, an embodiment of the present invention provides a switching power supply, including the voltage regulation feedback circuit as described in the above embodiment; the switching power supply is provided with a feedback voltage input terminal A and a voltage output terminal B; the normally closed contact of the conversion switch S1 is connected to the voltage output terminal B; the common terminal of the conversion switch S1 is connected to the feedback voltage input terminal A; the voltage output terminal is used to connect to an external electrical appliance to power the electrical appliance.

[0050] The feedback voltage input terminal A is also connected to a voltage regulating circuit;

[0051] The voltage regulating circuit is connected to a voltage regulating control unit;

[0052] The voltage regulating circuit includes a third resistor R3, a fourth resistor R4 and a potentiometer R5;

[0053] A first end of the third resistor R3 is connected to the common end of the conversion switch S1 as a feedback voltage input end;

[0054] The second end of the third resistor R3 is connected to the potentiometer R5 through the fourth resistor R4;

[0055] The second end of the third resistor R3 is connected to the voltage regulation control unit.

[0056] The voltage regulation feedback circuit designed in this application can feed back the actual voltage at the electrical appliance end to the switching power supply, and automatically adjust the output voltage through the original voltage regulation control unit of the switching power supply.

[0057] Terminals I and II are power input terminals, connected to AC 220V.

[0058] Terminal III is the positive output terminal of the switching power supply voltage, that is, the positive output terminal.

[0059] Terminal IV is the negative pole of the switching power supply voltage output, that is, the negative pole of the output terminal.

[0060] Terminal V is the feedback voltage input for the appliance. Connect another wire from the positive terminal of the appliance to terminal V.

[0061] Because the cable is too long, the voltage at terminal III, V0, experiences a voltage drop after connecting to the positive terminal of the appliance, resulting in an actual voltage of V1. Connecting another cable of the same length back to the appliance results in a voltage of V2 at the end of the cable. Since the two cables have the same length and path, the voltage drop is the same, so V1 = (V0 + V2) / 2.

[0062] like Figure 4 As shown, at S1, point A is the switching power supply's feedback voltage input point. The switching power supply adjusts the output voltage based on this point, after the voltage is stepped down by R3. Point B is the output voltage V0, and point C is the automatically regulated feedback voltage V3. Since R1 and R2 have the same resistance value, when terminal V is connected to the consumer's feedback voltage, V3 = (V0 + V2) / 2, resulting in V3 = V1. This means that the voltage at point C is the actual voltage V1 on the consumer side.

[0063] The transfer switch switches between conducting points A and B and C. When AB is conducting, the potentiometer on the switching power supply adjusts the output voltage to the standard value, initializing the power supply. When AC is conducting, the output voltage V1 automatically adjusts the switching power supply. When V1 equals the standard value, the output voltage V0 remains unchanged. When V1 is less than the standard value, the output voltage V0 increases until V1 equals the standard value. When V1 is greater than the standard value, the output voltage V0 decreases until V0 equals the standard value.

[0064] In some embodiments, the switching power supply further includes a power input terminal, a rectifier unit, and a voltage regulating unit; the power input terminal is connected to the voltage regulating unit through the rectifier unit;

[0065] The voltage regulating unit is connected to the voltage regulating control unit;

[0066] The voltage regulating unit is also connected to the voltage output terminal.

[0067] The device also includes a circuit board and a shell; the circuit board is arranged in the shell;

[0068] The rectifier unit, the voltage regulating unit, the voltage regulating control unit and the voltage regulating feedback circuit module are arranged on the circuit board.

[0069] The switching power supply is also provided with an output terminal, a feedback terminal and a ground terminal;

[0070] The output terminal is connected to the power output end, the feedback terminal is connected to the end of the second resistor away from the first resistor, the ground terminal is connected to the ground end of the switching power supply, and one end of the power input terminal is connected to the external AC power and the other end is connected to the rectifier unit.

[0071] It should be noted that if Figure 4 As shown, the power input terminal is connected to the rectifier unit through an inductor L1, and a capacitor C1 is connected between the two ends of the inductor L1 connected to the power input terminal; the rectifier unit is a rectifier bridge designed with diodes D1-D4, and the output end of the rectifier bridge is connected to the voltage regulation unit, where the voltage regulation unit includes a transformer, and the two ends of the primary side coil N1 of the transformer are connected in parallel with diodes D5 and D6 connected in series with a common cathode; the first end of the secondary side coil N2 of the transformer is connected to the positive electrode III of the output terminal of the switching power supply through a diode D7 and an inductor L2, and the second end of the secondary side coil N2 of the transformer is connected to the negative electrode IV of the output terminal of the switching power supply; a capacitor C6 is connected between the cathode of the diode D7 and the second end of the secondary side coil N2; the first end of the secondary side coil N3 of the transformer is connected to the voltage regulation control unit through a diode D8, the second end of the secondary side coil N3 of the transformer is grounded, and the second end of the secondary side coil N3 of the transformer is also connected to the cathode of the diode D8 through the capacitor C7.

[0072] The voltage regulation control unit includes a control chip IC1 and a photocoupler IC2; one end of the primary side coil N1 connected to the diode D6 is connected to the control chip, the signal input end of the control chip is connected to the emitter of the transistor of the photocoupler IC2, the collector of the photocoupler transistor is connected to the cathode of the diode D8, and the signal input end of the control chip is also grounded through a resistor R8 and a capacitor C3 connected in series; the anode of the photocoupler diode is connected to the cathode of the diode D7, and the cathode of the photocoupler diode is connected to the output end of the voltage regulator chip IC3 through the resistor R7, the input end of the voltage regulator chip is connected to the connection point of the resistor R3 and the resistor R4, the anode of the photocoupler diode is also connected to the output end of the voltage regulator chip IC3 through the resistor R6 and the capacitor C8 connected in series, the output end of the voltage regulator chip IC3 is also connected to the anode of the photocoupler diode through the resistor R6, the ground end of the voltage regulator chip IC3 is grounded, and capacitors C4 and C5 are connected in series between the ground end of the second end of the secondary side coil N3 of the transformer and the ground end of the voltage regulator chip IC3. An embodiment of the present utility model further provides a laser cutting system, comprising a laser cutting machine display and a switching power supply connected to the laser cutting machine display; the switching power supply is the switching power supply described in the above embodiment.

[0073] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall fall within the scope of the present invention. Any changes or substitutions that can be easily conceived by persons skilled in the art within the technical scope disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. A voltage regulation feedback circuit module, characterized in that: A voltage regulation feedback circuit is included, the circuit including a conversion switch, a first resistor and a second resistor; a normally closed contact of the conversion switch is connected to a voltage output terminal of an external switching power supply; The normally closed contact of the transfer switch is also connected to a first resistor and a second resistor connected in series; The common terminal of the transfer switch is connected to the feedback voltage input terminal of the external switching power supply; The normally open contact of the transfer switch is connected to the connection point of the first resistor and the second resistor; One end of the second resistor away from the first resistor serves as an input end for a feedback voltage of an external electrical appliance.

2. The voltage regulation feedback circuit module according to claim 1, characterized in that: The module also includes a terminal block; The voltage regulation feedback circuit is connected to the voltage output terminal and feedback voltage input terminal of the external switching power supply and the electrical appliance through the terminal block.

3. The voltage regulation feedback circuit module according to claim 2, wherein: The terminal block includes a first terminal, a second terminal and a third terminal; The normally closed contact of the transfer switch is connected to the first terminal; the first terminal is used to connect to the voltage output end of the switching power supply; the end of the second resistor away from the first resistor is connected to the second terminal; the second terminal is used to connect to an external electrical appliance; the common end of the transfer switch is connected to the third terminal; the third terminal is used to connect to the feedback voltage input end of the switching power supply.

4. A switching power supply, characterized in that: The switching power supply comprises a voltage regulation feedback circuit module as claimed in claim 1; the switching power supply is provided with a feedback voltage input terminal and a voltage output terminal; The normally closed contact of the transfer switch is connected to the voltage output terminal; the common terminal of the transfer switch is connected to the feedback voltage input terminal; the voltage output terminal is used to connect to an external electrical appliance to supply power to the electrical appliance.

5. The switching power supply according to claim 4, characterized in that: The feedback voltage input terminal is also connected to a voltage regulating circuit; The voltage regulation circuit is connected to a voltage regulation control unit.

6. The switching power supply according to claim 5, characterized in that: The voltage regulating circuit includes a third resistor, a fourth resistor and a potentiometer; A first end of the third resistor is connected to the common end of the conversion switch as a feedback voltage input end; The second end of the third resistor is connected to the potentiometer through a fourth resistor; The second end of the third resistor is connected to the voltage regulation control unit.

7. The switching power supply according to claim 6, characterized in that: The switching power supply also includes a power input terminal, a rectifier unit and a voltage regulation unit; The power input terminal is connected to the voltage regulating unit through the rectifier unit; The voltage regulating unit is connected to the voltage regulating control unit; The voltage regulating unit is also connected to the voltage output terminal.

8. The switching power supply according to claim 7, characterized in that: The switching power supply further includes a circuit board and a housing; the circuit board is arranged in the housing; The rectifier unit, the voltage regulating unit, the voltage regulating control unit and the voltage regulating feedback circuit module are arranged on the circuit board.

9. The switching power supply according to claim 8, characterized in that: The switching power supply is also provided with an output terminal, a feedback terminal and a ground terminal; The output terminal is connected to the power output end, the feedback terminal is connected to the end of the second resistor away from the first resistor, the ground terminal is connected to the ground end of the switching power supply, and one end of the power input terminal is connected to the external AC power and the other end is connected to the rectifier unit.

10. A laser cutting system, characterized in that: It comprises a laser cutting machine display and a switching power supply connected to the laser cutting machine display; the switching power supply is the switching power supply according to any one of claims 4 to 9.

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