CN218771756U - Capacitor discharge circuit and welding power supply circuit - Google Patents
Capacitor discharge circuit and welding power supply circuit Download PDFInfo
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- CN218771756U CN218771756U CN202222917163.9U CN202222917163U CN218771756U CN 218771756 U CN218771756 U CN 218771756U CN 202222917163 U CN202222917163 U CN 202222917163U CN 218771756 U CN218771756 U CN 218771756U
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Abstract
The application discloses electric capacity discharge circuit and welding power supply circuit, this electric capacity discharge circuit includes: the first power supply connecting end and the second power supply connecting end are respectively connected with the first end and the second end of the external capacitor circuit so as to receive a first power supply provided by the capacitor circuit; the control circuit is connected with the first power supply connecting end to receive the first power supply provided by the first power supply connecting end and generate a control signal according to the output voltage of the first power supply; the switch circuit is connected with the first power supply connecting end, the second power supply connecting end, the control circuit and an external load so as to receive a first power supply provided by the first power supply connecting end and the second power supply connecting end and a control signal sent by the control circuit, change the conduction state of the switch circuit under the action of the control signal, adjust the first power supply and provide the adjusted first power supply for the load. The capacitor discharge circuit in this application can discharge outside capacitor circuit to the safe voltage within range fast to effectively protect maintenance personal's personal safety.
Description
Technical Field
The application relates to the technical field of electronic equipment, in particular to a capacitor discharge circuit and a welding power supply circuit.
Background
Nowadays, in electrical equipment, especially electrical equipment powered by a high-voltage ac power supply, it is usually inevitable to configure a capacitor for filtering and/or adjusting power factors, and due to the energy storage effect of the capacitor, it is necessary to consider how to discharge the capacitor after stopping the power supply of the high-voltage ac power supply, so as to avoid the risk of electric shock to the corresponding personnel.
However, in the existing circuit design, a series voltage dividing resistor is usually adopted to equalize the voltage of the capacitor and discharge the capacitor through the resistor, so that after the high-voltage ac power supply is turned off, the power consumption of the resistor is very high, and the discharge through the resistor is very slow, so that the discharge time of the capacitor is very long, especially in the maintenance process, an engineer needs to spend a long time waiting for the discharge of the capacitor, and when the capacitor does not discharge to a safe voltage range, an electric shock risk may be caused, thereby bringing great inconvenience.
SUMMERY OF THE UTILITY MODEL
The application provides a capacitor discharge circuit and welding power supply circuit, this capacitor discharge circuit can solve the configuration among the prior art and have high-voltage capacitor's electrical equipment, and after closing the alternating current power supply, the discharge resistance consumption is great, and discharge time is longer, has the problem of the risk of electrocuting.
In order to solve the technical problem, the application adopts a technical scheme that: there is provided a capacitance discharge circuit, wherein the capacitance discharge circuit includes: the first power supply connecting end and the second power supply connecting end are respectively connected with the first end and the second end of the external capacitor circuit so as to receive a first power supply provided by the capacitor circuit; the control circuit is connected with the first power supply connecting end to receive a first power supply provided by the first power supply connecting end and generate a control signal according to the output voltage of the first power supply; the switch circuit is connected with the first power supply connecting end, the second power supply connecting end, the control circuit and an external load so as to receive a first power supply provided by the first power supply connecting end and the second power supply connecting end and a control signal sent by the control circuit, change the conduction state of the switch circuit under the action of the control signal, adjust the first power supply and provide the adjusted first power supply for the load.
The control circuit increases the duty ratio of the control signal currently provided to the switching circuit when determining that the output voltage of the first power supply is smaller than a preset voltage threshold value, and decreases the duty ratio of the control signal currently provided to the switching circuit when determining that the output voltage of the first power supply is larger than the preset voltage threshold value.
The capacitor discharge circuit further comprises a gating circuit, wherein the gating circuit comprises a first power supply sub-circuit and a second power supply sub-circuit, the first power supply sub-circuit is connected with the first power supply connecting end, the second power supply sub-circuit and the control circuit, the second power supply sub-circuit is connected with the first power supply connecting end and the control circuit, the first power supply sub-circuit and the second power supply sub-circuit receive a first power supply provided by the first power supply connecting end, when the output voltage of the first power supply is greater than or equal to a preset voltage threshold value, connection between the first power supply sub-circuit and the control circuit is triggered to be conducted, the first power supply is adjusted through the first power supply sub-circuit, the adjusted first power supply is provided for the control circuit, and the control circuit generates a first control signal; when the output voltage of the first power supply is smaller than the preset voltage threshold, connection between the second power supply electronic circuit and the control circuit is triggered to be conducted, so that the first power supply is adjusted through the second power supply electronic circuit, and the adjusted first power supply is provided for the control circuit, so that the control circuit generates a second control signal.
The capacitor discharge circuit further comprises a first resistor, the first power supply electronic circuit comprises a first diode, a first capacitor, a first switch tube, a second resistor, a second diode and a first voltage-regulator tube, and the second power supply electronic circuit comprises a third diode, a third resistor, a fourth diode, a second capacitor, a second voltage-regulator tube, a second switch tube, a fourth resistor and a third capacitor; the first end of the first diode is connected with the first end of the third diode, the first end of the second capacitor and the first end of the third capacitor and is grounded, the second end of the first diode is connected with the first end of the first capacitor, the first end of the first switch tube and the first end of the second resistor, the second end of the first switch tube is connected with the first end of the second diode, the third end of the first switch tube is connected with the second end of the second resistor, the first end of the second switch tube and the first end of the first voltage regulator tube, the second end of the second diode is connected with the second end of the fourth diode, the second end of the third capacitor, the first end of the first resistor and the control circuit, the second end of the first resistor is connected with the first power supply connecting end, the second end of the third diode is connected with the first end of the third resistor, the second end of the second capacitor and the first end of the fourth diode, the second end of the third resistor is connected with the first end of the second voltage regulator tube, the second end of the second voltage regulator tube is connected with the first end of the second switch tube and the first end of the fourth resistor, and the second end of the second voltage regulator tube is grounded.
The switch circuit comprises an energy storage sub-circuit and a switch sub-circuit, wherein the energy storage sub-circuit is connected with a first power supply connecting end, a second power supply connecting end, the switch sub-circuit and a load, the switch sub-circuit is connected with the control circuit, and the energy storage sub-circuit receives a first power supply provided by the first power supply connecting end and the second power supply connecting end to store energy when the switch sub-circuit receives a control signal sent by the control circuit and is triggered and conducted under the action of the control signal; when the switch sub-circuit is triggered to be turned off under the action of the control signal, the energy storage sub-circuit outputs an energy storage power supply to the load.
The energy storage sub-circuit comprises a fourth capacitor and a fifth capacitor, and the switch sub-circuit comprises a fifth diode, a third switch tube, a sixth diode and a fourth switch tube; the first end of the fourth capacitor is connected with the first power connection end, the first end of the fifth diode and the first end of the load, the second end of the fourth capacitor is connected with the first end of the third switching tube, the first end of the fifth capacitor, the first end of the sixth diode and the second end of the load, the second end of the third switching tube is connected with the second end of the fifth diode, the third end of the third switching tube is connected with the control circuit, the second end of the fifth capacitor is connected with the second power connection end and the first end of the fourth switching tube, the second end of the fourth switching tube is connected with the second end of the sixth diode, and the third end of the fourth switching tube is connected with the control circuit.
The capacitor discharge circuit further comprises a voltage conversion circuit, wherein the voltage conversion circuit is connected with the switch circuit and the load so as to receive the regulated first power supply provided by the switch circuit, convert the voltage of the regulated first power supply and provide the voltage to the load.
The capacitor discharging circuit further comprises a rectifying and filtering circuit, wherein the rectifying and filtering circuit is connected with the voltage conversion circuit and the load so as to receive the voltage-converted first power supply provided by the voltage conversion circuit, rectify and filter the voltage-converted first power supply and provide the rectified and filtered voltage-converted first power supply to the load.
The voltage conversion circuit is a transformer, the transformer comprises a primary winding and a secondary winding, and the rectification filter circuit comprises a seventh diode and a sixth capacitor; the first end of the secondary winding is connected with the first end of a seventh diode, the second end of the seventh diode is connected with the first end of a sixth capacitor and the first end of a load, and the second end of the secondary winding is connected with the second end of the sixth capacitor and the second end of the load.
In order to solve the above technical problem, the present application adopts another technical solution: the welding power supply circuit comprises a rectifying circuit, a capacitor circuit and a capacitor discharging circuit, wherein the rectifying circuit is connected with an external second power supply and the capacitor circuit, the capacitor circuit is connected with the capacitor discharging circuit, the rectifying circuit receives the second power supply, rectifies the second power supply and supplies the second power supply to the capacitor circuit, so that the capacitor circuit converts the rectified second power supply into a first power supply and supplies the first power supply to the capacitor discharging circuit; wherein the capacitor discharge circuit is as described in any one of the above.
The beneficial effect of this application is: different from the prior art, the first power connection end and the second power connection end in the capacitor discharge circuit provided by the application are respectively connected with the first end and the second end of the external capacitor circuit to receive a first power supply provided by the capacitor circuit, the control circuit is correspondingly connected with the first power connection end to receive the first power supply provided by the first power connection end and generate a control signal according to the output voltage of the first power supply, and the switch circuit is connected with the first power connection end, the second power connection end, the control circuit and the external load to receive the first power supply provided by the first power connection end and the second power connection end and the control signal sent by the control circuit and change the conduction state of the control circuit under the action of the control signal to adjust the first power supply and provide the adjusted first power supply to the load, so that the external capacitor circuit can be rapidly discharged to the safe voltage range, and the personal safety of maintenance personnel is effectively protected. And useless power consumption caused by the discharge resistor can be effectively avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
FIG. 1 is a schematic diagram of a first embodiment of a capacitive discharge circuit according to the present application;
FIG. 2 is a schematic diagram of a second embodiment of the capacitor discharge circuit of the present application;
FIG. 3 is a schematic diagram of a third embodiment of the capacitor discharge circuit of the present application;
FIG. 4 is a schematic diagram of a fourth embodiment of the capacitor discharge circuit of the present application;
FIG. 5 is a schematic diagram of a fifth embodiment of the capacitor discharge circuit of the present application;
fig. 6 is a schematic diagram of an embodiment of a welding power supply circuit according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. In the embodiment of the present application, all the directional indicators (such as upper, lower, left, right, front, and rear … …) are used only to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
The present application will be described in detail with reference to the drawings and examples.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a capacitor discharge circuit according to a first embodiment of the present application. In the present embodiment, the capacitor discharge circuit 10 includes: a first power supply connection 11, a second power supply connection 12, a control circuit 13 and a switching circuit 14.
The capacitor discharge circuit 10 provided in the present application is specifically used for an electrical device configured with a capacitor and powered by a high-voltage ac power supply, for example, a welding power supply is connected, so that when the power supply of the welding machine power supply stops supplying power, the capacitor discharge circuit 10 can rapidly discharge the stored energy of the capacitor circuit 101 in the welding machine power supply to a safe voltage range, so as to avoid bringing an electric shock risk to related personnel. Of course, in other embodiments, the capacitor discharge circuit 10 may be specifically disposed in any other reasonable electronic device such as a low-voltage switchgear with a capacitor, and the present embodiment does not limit this.
The welding power source is CO 2 The power supply for (carbon dioxide) gas shielded welding adopts flat characteristic or slow drop characteristic, and the no-load voltage is usually 38-70V.
Specifically, the first power connection terminal 11 and the second power connection terminal 12 in the capacitor discharge circuit 10 are respectively connected to the first terminal and the second terminal of the external capacitor circuit 101, so as to receive the first power correspondingly provided by the capacitor circuit 101.
It can be understood that the first power supply may specifically be an ac power supply filtered by the capacitor circuit 101, or may be a temporary power supply formed by storing energy in the capacitor circuit 101 before the ac power supply stops supplying power, and after being continuously discharged by the capacitor discharge circuit 10, the corresponding output voltage can gradually decrease to a safe voltage range until it is zero.
Further, the control circuit 13 is connected to the first power connection terminal 11 to receive the first power correspondingly provided by the first power connection terminal 11, and generate a corresponding control signal according to an output voltage of the first power, for example, a specific magnitude of the output voltage of the first power, or a comparison result between the output voltage and a preset voltage threshold.
The switch circuit 14 is correspondingly connected to the first power connection terminal 11, the second power connection terminal 12, the control circuit 13 and the external load 102, so as to be able to receive the first power supply correspondingly provided by the first power connection terminal 11 and the second power connection terminal 12, and the control signal sent by the control circuit 13, so that the on state of the switch circuit can be changed under the action of the control signal, for example, the duration corresponding to the trigger on and trigger off of the switch circuit is used to adjust the first power supply, and the adjusted first power supply is provided to the load 102, so as to drive the load 102 to operate, so that when the first power supply corresponds to the stored energy of the external capacitor circuit 101, the stored energy can be discharged and consumed, so as to quickly reduce the output voltage of the external capacitor circuit 101 to a safe voltage range.
It should be noted that the load 102 may be an electrical load used in cooperation with an electrical device equipped with the capacitor circuit 101, for example, any reasonable electrical load such as a cooling fan used for cooling the electrical device, or a lighting device, so that when the capacitor circuit 101 receives a corresponding ac power supply, the load 102 can be normally powered by the capacitor circuit 101 to meet a usage requirement of the electrical device, and after the capacitor circuit 101 turns off the power supply, the power supply of the load 102 can be maintained for a while to discharge stored energy in front of the capacitor circuit 101, so that an actual power utilization scenario can be reasonably utilized, and loss and waste of idle power can be avoided.
In an embodiment, the control signal generated by the control circuit 13 may specifically be a pulse width modulation signal, and the control circuit 13 is further provided with a preset voltage threshold, and the control circuit 13 specifically compares the output voltage of the first power source received by the control circuit 13 with the preset voltage threshold, so as to generate a corresponding control signal according to the current comparison result.
The comparison result specifically includes that the output voltage of the first power supply is less than the preset voltage threshold and the output voltage of the first power supply is greater than the preset voltage threshold, so that when the control circuit 13 determines that the output voltage of the first power supply is less than the preset voltage threshold, the duty ratio of the control signal currently provided to the switch circuit 14 can be increased, so as to increase the duration of outputting the first power supply to the load 102 by the switch circuit 14, and meet the power supply requirement of the load 102. When the output voltage of the first power supply is determined to be greater than the preset voltage threshold, the duty ratio of the control signal currently provided to the switching circuit 14 is reduced to reduce the time duration for the switching circuit 14 to output the first power supply to the load 102, so that the output voltage of the first power supply can be prevented from exceeding the rated voltage of the load 102, and the load 102 is prevented from being damaged.
It can be understood that, since the first power source output to the first power source connection terminal 11 and the second power source connection terminal 12 by the external capacitor circuit 101 is dynamically changed, and the corresponding control circuit 13 dynamically adjusts the generated control signal to meet the power supply requirement of the load 102 in real time, the load 102 can be continuously in a normal operating state until the first power source is reduced to a level where the load 102 cannot be driven.
In another embodiment, the control circuit 13 may further directly generate a control signal according to the magnitude of the output voltage of the first power supply and a corresponding preset function, and determine the duty ratio of the control signal, which is not limited in this application.
Optionally, the control circuit 13 may specifically be any reasonable functional circuit with program processing, such as an MCU (micro controller Unit) circuit, a single chip microcomputer or a system on chip, so as to facilitate a user to reasonably set, reset or update the control signal generating program according to an actual application scenario of the capacitor discharge circuit 10, which is not limited in this application.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a capacitor discharge circuit according to a second embodiment of the present application. In this embodiment, on the basis of the first embodiment of the capacitance discharge circuit provided in this application, the capacitance discharge circuit 20 further includes a gating circuit 25.
Specifically, the gate circuit 25 further includes a first power supply sub-circuit 251 and a second power supply sub-circuit 252, the first power supply sub-circuit 251 is correspondingly connected to the first power connection terminal 21, the second power supply sub-circuit 252 and the control circuit 23, and the second power supply sub-circuit 252 is connected to the first power connection terminal 21 and the control circuit 23, so that the first power supply sub-circuit 251 and the second power supply sub-circuit 252 can correspondingly receive the first power supplied by the first power connection terminal 21.
When the output voltage of the first power supply provided to the gate circuit 25 by the external capacitor circuit 101 is greater than or equal to the preset voltage threshold, specifically, the connection between the first power supply sub-circuit 251 in the gate circuit 25 and the control circuit 23 is triggered to be turned on, so that the first power supply is adjusted by the first power supply sub-circuit 251, and the adjusted first power supply is provided to the control circuit 23, so that the control circuit 23 generates the first control signal.
When the output voltage of the first power supply is smaller than the preset voltage threshold, the connection between the second power supply sub-circuit 252 and the control circuit 23 can be correspondingly triggered and conducted, so that the first power supply is adjusted by the second power supply sub-circuit 252, and the adjusted first power supply is provided to the control circuit 23, so that the control circuit 23 generates a second control signal.
It can be understood that the first power supply circuit 251 can be specifically triggered to be turned on when outputting a stable first power supply to the external capacitor circuit 101, so as to supply power to the control circuit 23, and correspondingly generate a more stable first control signal; the second power supply sub-circuit 252 correspondingly outputs an unstable first power source for the external capacitor circuit 101, that is, when the stored energy of the capacitor circuit 101 is released, the second power supply sub-circuit is triggered to be turned on to supply power to the control circuit 23, and correspondingly generates a second control signal with a dynamic change, that is, a second control signal with a continuously increased duty ratio, so as to meet the current power supply requirement of the load 102.
It is understood that, in the present embodiment, the first power connection terminal 21, the second power connection terminal 22, the control circuit 23 and the switch circuit 24 are respectively the same as the first power connection terminal 11, the second power connection terminal 12, the control circuit 13 and the switch circuit 14, and please refer to fig. 1 and the related text, which are not repeated herein.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a capacitor discharge circuit according to a third embodiment of the present application. In this embodiment, based on the first embodiment of the capacitor discharging circuit provided in the present application, the switch circuit 34 in the capacitor discharging circuit 30 further includes a tank sub-circuit 341 and a switch sub-circuit 342.
Specifically, the energy storage sub-circuit 341 is correspondingly connected to the first power connection terminal 31, the second power connection terminal 32, the switch sub-circuit 342 and the load 102, and the switch sub-circuit 342 is connected to the control circuit 33, so that when the switch sub-circuit 342 receives the control signal sent by the control circuit 33 and is triggered to be turned on under the action of the control signal, the energy storage sub-circuit 341 can receive the first power provided by the first power connection terminal 31 and the second power connection terminal 32 to store energy, and the switch sub-circuit 342 does not output power to the load 102.
Further, when the switch sub-circuit 342 is triggered to turn off by the control signal sent by the control circuit 33, the energy storage sub-circuit 341 can output the energy storage power supply to the load 102, so as to operate the load 102.
It can be seen that the capacitor discharge circuit 30 can be specifically understood as a double flyback power supply.
It can be understood that, in the present embodiment, the first power connection terminal 31, the second power connection terminal 32 and the control circuit 33 are respectively the same as the first power connection terminal 11, the second power connection terminal 12 and the control circuit 13, and specific reference is made to fig. 1 and related text, which are not repeated herein.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a capacitor discharge circuit according to a fourth embodiment of the present invention. In this embodiment, based on the first embodiment of the capacitor discharge circuit provided in the present application, the capacitor discharge circuit 40 further includes a voltage conversion circuit 46.
Specifically, the voltage conversion circuit 46 is correspondingly connected to the switch circuit 44 and the load 102, so as to receive the regulated first power supplied by the switch circuit 44, and convert the regulated first power, for example, convert the output voltage of the regulated first power into a voltage level capable of driving the load 102 to operate, and supply the voltage level to the load 102.
Further, in an embodiment, the capacitor discharging circuit 40 further includes a rectifying and filtering circuit 47, and the rectifying and filtering circuit 47 is correspondingly connected to the voltage converting circuit 46 and the load 102, so as to receive the first power source, which is correspondingly provided by the voltage converting circuit 46 and converted by the voltage thereof, and provide the first power source, which is subjected to rectifying and filtering, to the load 102.
It is understood that in the present embodiment, the first power connection terminal 41, the second power connection terminal 42, the control circuit 43 and the switch circuit 44 are respectively the same as the first power connection terminal 11, the second power connection terminal 12, the control circuit 13 and the switch circuit 14, and specific reference is made to fig. 1 and related text, which are not repeated herein.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a fifth embodiment of the capacitor discharge circuit of the present application. In this embodiment, on the basis of the first embodiment of the capacitor discharge circuit provided in the present application, the gating circuit 55 further includes a first power supply sub-circuit 551 and a second power supply sub-circuit 552.
The first power supply electronic circuit 551 further includes a first diode D1, a first capacitor C1, a first switch Q1, a second resistor R2, a second diode D2, and a first voltage regulator ZD1, and the second power supply electronic circuit 552 includes a third diode D3, a third resistor R3, a fourth diode D4, a second capacitor C2, a second voltage regulator ZD2, a second switch Q2, a fourth resistor R4, and a third capacitor C3.
The first end of the first diode D1 is connected to the first end of the third diode D3, the first end of the second capacitor C2, and the first end of the third capacitor C3 and is grounded, the second end of the first diode D1 is connected to the first end of the first capacitor C1, the first end of the first switch Q1, and the first end of the second resistor R2, the second end of the first switch Q1 is connected to the first end of the second diode D2, the third end of the first switch Q1 is connected to the second end of the second resistor R2, the first end of the second switch Q2, and the first end of the first regulator ZD1, the second end of the second diode D2 is connected to the second end of the fourth diode D4, the second end of the third capacitor C3, the first end of the first resistor R1, and the control circuit 53, the second end of the first resistor R1 is connected to the first power connection terminal 51, the second end of the third diode D3 is connected to the first end of the third resistor R3, the second end of the second capacitor C2, the second end of the fourth resistor R4, the second end of the second resistor ZD2, and the first end of the second resistor R2 are connected to the second terminal of the second regulator Q2, and the second end of the fourth resistor ZD2 are connected to the second end of the second regulator Q4, and the second end of the second diode D2, and the second regulator Q2 are connected to the second regulator Q4, and the second regulator Q2, and the second end of the second regulator is connected to the second regulator.
It should be noted that the first resistor R1 has a relatively large resistance value, so as to effectively step down the output voltage of the external capacitor circuit 101, and avoid damage to the chip, the switch tube, the diode, and other elements in the capacitor discharge circuit 50.
In an embodiment, the switch circuit 54 in the capacitor discharging circuit 50 includes an energy storage sub-circuit 541 and a switch sub-circuit 542, the energy storage sub-circuit 541 further includes a fourth capacitor C4 and a fifth capacitor C5, and the switch sub-circuit 542 further includes a fifth diode D5, a third switch Q3, a sixth diode D6 and a fourth switch Q4.
The first end of the fourth capacitor C4 is connected to the first power connection terminal 51, the first end of the fifth diode D5 and the first end of the load 102, the second end of the fourth capacitor C4 is connected to the first end of the third switching tube Q3, the first end of the fifth capacitor C5, the first end of the sixth diode and the second end of the load 102, the second end of the third switching tube Q3 is connected to the second end of the fifth diode D5, the third end of the third switching tube Q3 is connected to the control circuit 53, the second end of the fifth capacitor C5 is connected to the second power connection terminal 52 and the first end of the fourth switching tube Q4, the second end of the fourth switching tube Q4 is connected to the second end of the sixth diode, and the third end of the fourth switching tube Q4 is connected to the control circuit 53.
In an embodiment, the capacitor discharging circuit 50 further includes a voltage converting circuit 56 and a rectifying and filtering circuit 57, and the voltage converting circuit 56 is embodied as a transformer, and the transformer further includes a primary winding and a secondary winding, and the rectifying and filtering circuit 57 further includes a seventh diode D7 and a sixth capacitor C6.
A first end of a secondary winding of the transformer is connected to a first end of a seventh diode D7, a second end of the seventh diode D7 is connected to a first end of a sixth capacitor C6 and a first end of a load 102, and a second end of the secondary winding is connected to a second end of the sixth capacitor C6 and a second end of the load 102.
It should be noted that the control circuit 53 in the capacitor discharge circuit 50 may be specifically a driving chip, so that when the external capacitor circuit 101 supplies power to the first power connection terminal 51 and the second power connection terminal 52 of the capacitor discharge circuit 50, the driving chip can start working within a set power supply threshold range to trigger the third switch tube Q3 and the fourth switch tube Q4 to be turned on or off, so as to supply power to the load 102.
When the external capacitor circuit 101 has an ac input, that is, the capacitor circuit 101 outputs the first power to the capacitor discharge circuit 50 relatively stably, and the output voltage of the first power is relatively high, so that the first power is stepped down by the first resistor R1, rectified by the first diode D1 and filtered by the first capacitor C1, and then the first switch tube Q1 is triggered to be turned on, so as to supply power to the driving chip, that is, the control circuit 53, through the second diode D2. It can be understood that the voltage stabilizing value of the first voltage regulator tube ZD1 is specifically the highest voltage of the driver chip, and the voltage stabilizing value of the second voltage regulator tube ZD2 is the lowest working voltage of the driver chip, so that when the voltage is rectified by the third diode D3 and the voltage filtered by the second capacitor C2 is higher than the lowest holding voltage of the driver chip by about +0.7V, the second voltage regulator tube ZD2 starts to work, so that the second switch tube Q2 is saturated and switched on, and the first switch tube Q1 is switched off, at this time, the driver chip can be rectified by the fourth diode D4, and the third capacitor C3 supplies power after filtering.
Further, when the external capacitor circuit 101 loses ac input, that is, when the previous stored energy needs to be discharged, the first power supply correspondingly output to the capacitor discharge circuit 50 by the capacitor circuit 101 is gradually reduced, so that when the power supply voltage correspondingly output to the driving chip is reduced to about +0.7V, the second voltage regulator tube ZD2 will not work, the second switch tube Q2 is turned off, and the first switch tube Q1 is turned on, so as to continuously supply power to the driving chip through the second diode D2, so that the driving chip continuously works, that is, the pulse width modulation signal is continuously sent to the third switch tube Q3 and the fourth switch tube Q4, and the duty ratio of the pulse width modulation signal is gradually increased to meet the power supply requirement of the load 102, until the power supply voltage provided to the driving chip is reduced to the minimum threshold value at which the driving chip can work, at this time, the output voltage of the external capacitor circuit 101 is obviously reduced to the minimum, so as to avoid the risk of electric shock to corresponding maintenance personnel.
Fig. 6 is a schematic structural diagram of a welding power supply circuit according to an embodiment of the present disclosure. In the present embodiment, the welding power supply circuit 60 includes a rectifier circuit 61, a capacitor circuit 62, and a capacitor discharge circuit 63.
Specifically, the rectifying circuit 61 is connected to an external second power source and the capacitor circuit 62, the capacitor circuit 62 is connected to the capacitor discharging circuit 63, and the rectifying circuit 61 can receive the second power source, rectify the second power source, and then supply the second power source to the capacitor circuit 62, so that the capacitor circuit 62 converts the rectified second power source into the first power source, and then supply the first power source to the capacitor discharging circuit 63.
The capacitor discharging circuit 63 may be specifically any one of the capacitor discharging circuit 10, the capacitor discharging circuit 20, the capacitor discharging circuit 30, the capacitor discharging circuit 40, or the capacitor discharging circuit 50, which please refer to fig. 1-5 and the related text, which are not repeated herein.
Further, in an embodiment, the welding power circuit 60 further includes a high-voltage inverter circuit 64, a converter circuit 65, a filter circuit 66 and a protection resistor 67, the capacitor circuit 62 further includes a first filter capacitor Ca, a second filter capacitor Cb, a first filter resistor Ra and a second filter resistor Rb, and the filter circuit 66 further includes a first filter diode Da, a second filter diode Db and a filter inductor La, and the corresponding connection relationships are shown in the drawings and are not described herein.
It will be appreciated that the second power supply externally provided to the rectifying circuit 61 may specifically be a three-phase mains input, and corresponds to an ac power supply.
Different from the prior art, the first power connection end and the second power connection end in the capacitor discharge circuit provided by the application are respectively connected with the first end and the second end of an external capacitor circuit to receive a first power supply provided by the capacitor circuit, the control circuit is correspondingly connected with the first power connection end to receive the first power supply provided by the first power connection end and generate a control signal according to the output voltage of the first power supply, and the switch circuit is connected with the first power connection end, the second power connection end, the control circuit and an external load to receive the first power supply provided by the first power connection end and the second power connection end and a control signal sent by the control circuit and change the conduction state of the control signal to adjust the first power supply and provide the adjusted first power supply to the load, so that the external capacitor circuit can be rapidly discharged to a safe voltage range, and the personal safety of maintenance personnel is effectively protected. And useless power consumption caused by the discharge resistor can be effectively avoided.
The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.
Claims (10)
1. A capacitive discharge circuit, comprising:
the first power supply connecting end and the second power supply connecting end are respectively connected with the first end and the second end of the external capacitor circuit so as to receive a first power supply provided by the capacitor circuit;
the control circuit is connected with the first power supply connecting end to receive the first power supply provided by the first power supply connecting end and generate a control signal according to the output voltage of the first power supply;
the switch circuit is connected with the first power supply connecting end, the second power supply connecting end, the control circuit and an external load so as to receive the first power supply provided by the first power supply connecting end and the second power supply connecting end and the control signal sent by the control circuit, change the conduction state of the control signal under the action of the control signal, adjust the first power supply and provide the adjusted first power supply for the load.
2. The capacitive discharge circuit of claim 1,
the control signal is a pulse width modulation signal, the control circuit increases the duty ratio of the control signal currently provided to the switching circuit when determining that the output voltage of the first power supply is less than a preset voltage threshold, and decreases the duty ratio of the control signal currently provided to the switching circuit when determining that the output voltage of the first power supply is greater than the preset voltage threshold.
3. The capacitive discharge circuit of claim 1,
the capacitor discharge circuit further comprises a gating circuit, wherein the gating circuit comprises a first power supply sub-circuit and a second power supply sub-circuit, the first power supply sub-circuit is connected with the first power supply connecting end, the second power supply sub-circuit and the control circuit, the second power supply sub-circuit is connected with the first power supply connecting end and the control circuit, the first power supply sub-circuit and the second power supply sub-circuit receive the first power supply provided by the first power supply connecting end, when the output voltage of the first power supply is larger than or equal to a preset voltage threshold value, connection between the first power supply sub-circuit and the control circuit is triggered to be conducted, the first power supply is adjusted through the first power supply sub-circuit, and the adjusted first power supply is provided for the control circuit, so that the control circuit generates a first control signal;
when the output voltage of the first power supply is smaller than the preset voltage threshold, triggering and conducting the connection between the second power supply electronic circuit and the control circuit, so that the first power supply is adjusted through the second power supply electronic circuit, and the adjusted first power supply is provided for the control circuit, so that the control circuit generates a second control signal.
4. The capacitive discharge circuit of claim 3,
the capacitor discharge circuit further comprises a first resistor, the first power supply electronic circuit comprises a first diode, a first capacitor, a first switch tube, a second resistor, a second diode and a first voltage regulator tube, and the second power supply electronic circuit comprises a third diode, a third resistor, a fourth diode, a second capacitor, a second voltage regulator tube, a second switch tube, a fourth resistor and a third capacitor;
the first end of the first diode is connected with the first end of the third diode, the first end of the second capacitor and the first end of the third capacitor and is grounded, the second end of the first diode is connected with the first end of the first capacitor, the first end of the first switch tube and the first end of the second resistor, the second end of the first switch tube is connected with the first end of the second diode, the third end of the first switch tube is connected with the second end of the second resistor, the first end of the second switch tube and the first end of the first voltage regulator tube, the second end of the second diode is connected with the second end of the fourth diode, the second end of the third capacitor, the first end of the first resistor and the control circuit, the second end of the first resistor is connected with the first power supply connection end, the second end of the third diode is connected with the first end of the third resistor, the second end of the second capacitor and the first end of the fourth diode, the second end of the third resistor is connected with the second end of the second resistor, the second end of the second resistor is connected with the second end of the second resistor, the second terminal of the second resistor and the second terminal of the fourth voltage regulator tube, and the second terminal of the second resistor are connected with the second voltage regulator tube.
5. The capacitive discharge circuit of claim 1,
the switch circuit comprises an energy storage sub-circuit and a switch sub-circuit, the energy storage sub-circuit is connected with the first power supply connecting end, the second power supply connecting end, the switch sub-circuit and the load, the switch sub-circuit is connected with the control circuit, so that when the switch sub-circuit receives the control signal sent by the control circuit and is triggered and conducted under the action of the control signal, the energy storage sub-circuit receives the first power supply provided by the first power supply connecting end and the second power supply connecting end to store energy;
when the switch sub-circuit is triggered to be turned off under the action of the control signal, the energy storage sub-circuit outputs an energy storage power supply to the load.
6. The capacitive discharge circuit of claim 5,
the energy storage sub-circuit comprises a fourth capacitor and a fifth capacitor, and the switch sub-circuit comprises a fifth diode, a third switch tube, a sixth diode and a fourth switch tube;
the first end of the fourth capacitor is connected with the first power connection end, the first end of the fifth diode and the first end of the load, the second end of the fourth capacitor is connected with the first end of the third switching tube, the first end of the fifth capacitor, the first end of the sixth diode and the second end of the load, the second end of the third switching tube is connected with the second end of the fifth diode, the third end of the third switching tube is connected with the control circuit, the second end of the fifth capacitor is connected with the second power connection end and the first end of the fourth switching tube, the second end of the fourth switching tube is connected with the second end of the sixth diode, and the third end of the fourth switching tube is connected with the control circuit.
7. The capacitive discharge circuit of claim 1,
the capacitor discharge circuit further comprises a voltage conversion circuit, wherein the voltage conversion circuit is connected with the switch circuit and the load so as to receive the adjusted first power supply provided by the switch circuit, and provide the adjusted first power supply to the load after voltage conversion.
8. The capacitive discharge circuit of claim 7,
the capacitor discharging circuit further comprises a rectifying and filtering circuit, wherein the rectifying and filtering circuit is connected with the voltage conversion circuit and the load so as to receive the first power supply after voltage conversion provided by the voltage conversion circuit, and provide the first power supply after voltage conversion for the load after rectifying and filtering.
9. The capacitive discharge circuit of claim 8,
the voltage conversion circuit is a transformer, the transformer comprises a primary winding and a secondary winding, and the rectification filter circuit comprises a seventh diode and a sixth capacitor;
the first end of the secondary winding is connected with the first end of the seventh diode, the second end of the seventh diode is connected with the first end of the sixth capacitor and the first end of the load, and the second end of the secondary winding is connected with the second end of the sixth capacitor and the second end of the load.
10. A welding power supply circuit is characterized by comprising a rectifying circuit, a capacitor circuit and a capacitor discharging circuit, wherein the rectifying circuit is connected with an external second power supply and the capacitor circuit, the capacitor circuit is connected with the capacitor discharging circuit, the rectifying circuit receives the second power supply, rectifies the second power supply and supplies the rectified second power supply to the capacitor circuit, so that the rectified second power supply is converted into a first power supply by the capacitor circuit and then is supplied to the capacitor discharging circuit;
wherein the capacitance discharge circuit is as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222917163.9U CN218771756U (en) | 2022-10-31 | 2022-10-31 | Capacitor discharge circuit and welding power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222917163.9U CN218771756U (en) | 2022-10-31 | 2022-10-31 | Capacitor discharge circuit and welding power supply circuit |
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| CN218771756U true CN218771756U (en) | 2023-03-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117477978A (en) * | 2023-12-28 | 2024-01-30 | 深圳麦格米特电气股份有限公司 | Power supply conversion circuit, power supply circuit and electronic equipment |
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- 2022-10-31 CN CN202222917163.9U patent/CN218771756U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117477978A (en) * | 2023-12-28 | 2024-01-30 | 深圳麦格米特电气股份有限公司 | Power supply conversion circuit, power supply circuit and electronic equipment |
| CN117477978B (en) * | 2023-12-28 | 2024-06-11 | 深圳麦格米特电气股份有限公司 | Power supply conversion circuit, power supply circuit and electronic equipment |
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