Discharge protection circuit, filter circuit, rectifier, control system and sleeving machine

Abstract

The present invention provides a discharge protection circuit, a filter circuit, a rectifier, a control system and a tacking machine. A protection resistor, a discharge switch, a start protection switch, a first circuit input end and a second circuit input end are arranged; the first end of the protection resistor is electrically connected to the first circuit input end, the second end of the protection resistor is electrically connected to one end of the discharge switch, and the other end of the discharge switch is electrically connected to one end of a filter capacitor and the second circuit input end respectively; the first end of the start protection switch is electrically connected to the other end of the filter capacitor, the second end of the start protection switch is electrically connected to the first end of the protection resistor, and the third end of the start protection switch is electrically connected to the second end of the protection resistor, so that the start protection and discharge protection of the filter capacitor can be realized by only one protection resistor in the discharge protection circuit, and the number of protection resistors in the circuit is reduced, thereby saving space inside the equipment and reducing production and manufacturing costs.

Description

Technical Field

[0001] The present invention relates to the field of sewing technology, and in particular to a discharge protection circuit, a filter circuit, a rectifier, a control system and a tacking machine. Background Art

[0002] When a control device or control system is first connected to the power supply, a large current shock will be generated, which may cause damage to the circuit system. Therefore, in the design of the control system, protection measures are usually set in the circuit. Similarly, in circuits with energy feedback, corresponding protection measures are also set to prevent power feedback from causing losses to the circuit system.

[0003] In the field of sewing technology, applying startup protection and overvoltage protection to the control system is a commonly used technical means. The usual practice is to separately set up a protective resistor for startup protection and a protective resistor for discharging electrical energy. For example, in the control system of a tacking machine, protective resistors are provided for startup protection and overvoltage protection, respectively.

[0004] However, as the control system becomes more and more sophisticated, the internal space of the control system is getting smaller and smaller, while the protection resistors are often large in size and high in power, resulting in a waste of internal space of the equipment and increasing manufacturing and production costs. Summary of the invention

[0005] In view of this, the present invention provides a discharge protection circuit, a filter circuit, a rectifier, a control system and a tacking machine to solve the problems of waste of internal space of the equipment and increased manufacturing and production costs.

[0006] According to a first aspect of an embodiment of the present disclosure, the present invention provides a discharge protection circuit, comprising:

[0007] A protection resistor, a discharge switch, a start protection switch, a first circuit input terminal and a second circuit input terminal;

[0008] The first end of the protection resistor is electrically connected to the first circuit input end, the second end of the protection resistor is electrically connected to one end of the discharge switch, and the other end of the discharge switch is electrically connected to one end of the filter capacitor and the second circuit input end respectively; the first end of the startup protection switch is electrically connected to the other end of the filter capacitor, the second end of the startup protection switch is electrically connected to the first end of the protection resistor, and the third end of the startup protection switch is electrically connected to the second end of the protection resistor;

[0009] The first circuit input terminal and the second circuit input terminal are electrically connected to two poles of a power supply respectively;

[0010] The startup protection switch is used to be set to a first switch state or a second switch state according to the voltage of the filter capacitor; when in the first switch state, the first end of the startup protection switch and the third end of the startup protection switch are connected; when in the second switch state, the first end of the startup protection switch and the second end of the startup protection switch are connected;

[0011] The protection resistor is used to be connected in series with the filter capacitor when the protection switch is in the first switch state, and connected in series with the discharge switch when the protection switch is in the second switch state and the voltage of the filter capacitor is greater than the first preset voltage threshold, so that the circuit formed by the protection resistor and the discharge switch is connected in parallel with the filter capacitor;

[0012] The discharge switch is used to be turned on when the startup protection switch is in the second switch state and the voltage of the filter capacitor is greater than a first preset voltage threshold.

[0013] Optionally, the discharge protection circuit further includes:

[0014] A control device, one end of which is electrically connected to the filter capacitor, and the other end of which is electrically connected to the start protection switch;

[0015] The control device is used to obtain the voltage of the filter capacitor, and send a state switching control instruction to the startup protection switch if the voltage of the filter capacitor is greater than a second preset voltage threshold, and the second preset voltage threshold is less than the first preset voltage threshold;

[0016] The startup protection switch is specifically used to switch the first switch state to the second switch state according to the state switching control instruction.

[0017] Optionally, the startup protection switch includes: a relay, the state of the relay includes a normally open state and a normally closed state;

[0018] The relay is specifically used for being in a normally open state when the startup protection switch is in a first switch state; and being in a normally closed state when the startup protection switch is in a second switch state.

[0019] Optionally, the other end of the control device is also electrically connected to the discharge switch;

[0020] The control device is further configured to send a closing control instruction to the discharge switch if the voltage of the filter capacitor is greater than a first preset voltage threshold;

[0021] The discharge switch is specifically configured to be turned on according to the closing control instruction.

[0022] Optionally, the discharge switch includes: a MOS tube.

[0023] Optionally, the protective resistor is a cement resistor or an aluminum shell resistor.

[0024] According to a second aspect of the embodiments of the present disclosure, the present invention provides a filter circuit, comprising: a filter capacitor and a discharge protection circuit as described in any one of the first aspect of the embodiments of the present disclosure.

[0025] The discharge protection circuit is electrically connected to the filter capacitor.

[0026] According to a third aspect of the embodiments of the present disclosure, the present invention provides a rectifier device, comprising: a rectifier circuit and a filter circuit as described in the second aspect of the embodiments of the present disclosure.

[0027] The input end of the rectifier circuit is connected to an AC power source, and the output end of the rectifier circuit is electrically connected to a first circuit input end and a second circuit input end of the filter circuit respectively.

[0028] The rectifier circuit is used to rectify the input AC power supply and output DC power supply.

[0029] According to a fourth aspect of the embodiments of the present disclosure, the present invention provides a control system, including: an AC power supply, a load device, and a rectifier device as described in the second aspect of the embodiments of the present disclosure.

[0030] The AC power source, the rectifier, and the load device are electrically connected in sequence.

[0031] The AC power supply is used to supply power to the load device through the rectifier.

[0032] According to a fifth aspect of the embodiments of the present disclosure, the present invention provides a tacking machine, comprising a control system as described in the fourth aspect of the embodiments of the present disclosure.

[0033] The discharge protection circuit, filter circuit, rectifier, control system and tacking machine provided by the present invention are provided with a protection resistor, a discharge switch, a start protection switch, a first circuit input end and a second circuit input end; the first end of the protection resistor is electrically connected to the first circuit input end, the second end of the protection resistor is electrically connected to one end of the discharge switch, and the other end of the discharge switch is electrically connected to one end of the filter capacitor and the second circuit input end respectively; the first end of the start protection switch is electrically connected to the other end of the filter capacitor, the second end of the start protection switch is electrically connected to the first end of the protection resistor, and the third end of the start protection switch is electrically connected to the second end of the protection resistor; the first circuit input end and the second circuit input end are electrically connected to the two poles of the power supply correspondingly; the start protection switch is used to be set to the first switch state or the second switch state according to the voltage of the filter capacitor; when in the first switch state When the startup protection switch is in the first switch state, the first end of the startup protection switch and the third end of the startup protection switch are connected; when the startup protection switch is in the second switch state, the first end of the startup protection switch and the second end of the startup protection switch are connected; the protection resistor is used to be connected in series with the filter capacitor when the startup protection switch is in the first switch state, and when the startup protection switch is in the second switch state and the voltage of the filter capacitor is greater than the first preset voltage threshold, it is connected in series with the discharge switch, so that the circuit formed by the protection resistor and the discharge switch is connected in parallel with the filter capacitor; the discharge switch is used to be turned on when the startup protection switch is in the second switch state and the voltage of the filter capacitor is greater than the first preset voltage threshold, so that the startup protection and discharge protection of the filter capacitor can be realized by only one protection resistor in the discharge protection circuit, thereby reducing the number of protection resistors in the circuit, thereby saving space inside the equipment and reducing production and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0035] Figure 1 A schematic diagram of the structure of a discharge protection circuit provided by an embodiment of the present invention;

[0036] Figure 2 for Figure 1 In the illustrated embodiment, it is a schematic diagram of the connection circuit of the discharge protection circuit when the start protection switch is in the first switch state;

[0037] Figure 3 for Figure 1 In the illustrated embodiment, a schematic diagram of a connection loop of a discharge protection circuit when the startup protection switch is in the second switch state and the voltage of the filter capacitor is not greater than a first preset voltage threshold;

[0038] Figure 4 for Figure 1 In the illustrated embodiment, a schematic diagram of a connection loop of a discharge protection circuit when the protection switch is started to be in the second switch state and the voltage of the filter capacitor is greater than a first preset voltage threshold;

[0039] Figure 5 A schematic diagram of the structure of a discharge protection circuit provided by another embodiment of the present invention;

[0040] Figure 6 A schematic diagram of the structure of a filter circuit provided by an embodiment of the present invention;

[0041] Figure 7 A schematic diagram of the structure of a rectifier provided in one embodiment of the present invention;

[0042] Figure 8 A schematic diagram of the structure of a control system provided by one embodiment of the present invention.

[0043] The above-mentioned drawings have shown clear embodiments of the present disclosure, which will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments.

[0044] Reference numerals:

[0045] 1: discharge protection circuit; 11: start protection switch; 12: protection resistor; 13: discharge switch; 14: first circuit input terminal; 15: second circuit input terminal; 16: control device;

[0046] 2: Filter capacitor. DETAILED DESCRIPTION

[0047] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and systems consistent with some aspects of the present disclosure as detailed in the appended claims.

[0048] In the prior art, in order to solve the problems of excessive starting current and energy feedback in the circuit, corresponding starting protection and discharge protection are usually set. In the circuits used for starting protection and discharge protection, protective resistors for realizing starting protection and discharge protection are respectively set. However, the protective resistor in the starting protection circuit only plays a protective role when the circuit is connected to the power supply. As the circuit starts smoothly, the protective resistor in the starting protection circuit is short-circuited by the relay, so that it is always in an idle state, resulting in low utilization of the protective resistor in the starting protection circuit. At the same time, due to the existence of the protective resistor in the starting protection, the discharge protection will not be triggered when the system is just started. Therefore, considering that the starting protection and the discharge protection will not be triggered at the same time, the number of protective resistors can be reduced by sharing a protective resistor for the starting protection and the discharge protection. How to realize the starting protection and the discharge protection through a protective resistor in the circuit is the problem currently faced.

[0049] The following specific embodiments are used to describe in detail the technical solutions of the present invention and how the technical solutions of the present application solve the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0050] Figure 1 A schematic diagram of a discharge protection circuit structure provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the discharge protection circuit 1 provided in this embodiment includes:

[0051] A protection resistor 12 , a discharge switch 13 , a start protection switch 11 , a first circuit input terminal 14 and a second circuit input terminal 15 .

[0052] The first end of the protection resistor 12 is electrically connected to the first circuit input terminal 14, the second end of the protection resistor 12 is electrically connected to one end of the discharge switch 13, and the other end of the discharge switch 13 is electrically connected to one end of the filter capacitor 2 and the second circuit input terminal 15 respectively; the first end of the start-up protection switch 11 is electrically connected to the other end of the filter capacitor 2, the second end of the start-up protection switch 11 is electrically connected to the first end of the protection resistor 12, and the third end of the start-up protection switch 11 is electrically connected to the second end of the protection resistor 12.

[0053] The first circuit input terminal 14 and the second circuit input terminal 15 are electrically connected to the two poles of the power supply; specifically, the first circuit input terminal 14 is connected to the positive pole of the DC power supply, and the second circuit input terminal 15 is connected to the negative pole of the DC power supply. Of course, the first circuit input terminal 14 can also be connected to the negative pole of the DC power supply, and the second circuit input terminal 15 can be connected to the positive pole of the DC power supply. The electrical connection method of connecting the first circuit input terminal 14 and the second circuit input terminal 15 to the positive and negative poles of the DC power supply can be adjusted according to specific needs and is not specifically limited here.

[0054] The starting protection switch 11 is used to be set to a first switching state or a second switching state according to the voltage of the filter capacitor 2; when in the first switching state, the first end of the starting protection switch 11 and the third end of the starting protection switch 11 are connected; when in the second switching state, the first end of the starting protection switch 11 and the second end of the starting protection switch 11 are connected.

[0055] The startup protection switch 11 has at least a first switch state and a second switch state. When the startup protection switch 11 is in different states, the corresponding connection state of the pressure relief protection circuit changes accordingly, thereby realizing different circuit functions.

[0056] The protection resistor 12 is used to be connected in series with the filter capacitor 2 when the protection switch 11 is started and is in the first switching state, and to be connected in series with the discharge switch 13 when the protection switch 11 is started and is in the second switching state and the voltage of the filter capacitor 2 is greater than the first preset voltage threshold, so that the circuit formed by the protection resistor 12 and the discharge switch 13 is connected in parallel with the filter capacitor 2.

[0057] The discharge switch 13 is used to be turned on when the startup protection switch 11 is in the second switch state and the voltage of the filter capacitor 2 is greater than the first preset voltage threshold.

[0058] Figure 2 FIG. 1 is a schematic diagram of a connection circuit of the discharge protection circuit 1 when the protection switch 11 is in the first switch state. Figure 2 When the protection switch 11 is in the first state, the first end of the protection switch 11 and the third end of the protection switch 11 are connected, and the discharge switch 13 is disconnected. At this time, the connection loop of the pressure relief protection circuit is that the first circuit input terminal 14, the protection resistor 12, the filter capacitor 2, and the second circuit input terminal 15 are connected in series in sequence. The first circuit input terminal 14 and the second circuit input terminal 15 are respectively connected to the positive and negative electrodes of the DC power supply. Since the protection resistor 12 is connected in series in the connection loop, when the connection loop is connected to the DC power through the first circuit input terminal 14 and the second circuit input terminal 15, the protection resistor 12 has a larger resistance value, which will reduce the current of the connection loop, thereby realizing the protection of the filter capacitor 2.

[0059] Figure 3The connection circuit diagram of the discharge protection circuit 1 is as follows when the protection switch 11 is in the second switch state and the voltage of the filter capacitor 2 is not greater than the first preset voltage threshold. Figure 3 When the protection switch 11 is in the second switch state and the voltage of the filter capacitor 2 is not greater than the first preset voltage threshold, the first end of the protection switch 11 and the second end of the protection switch 11 are connected, and the discharge switch 13 is disconnected. At this time, the connection loop of the pressure relief protection circuit is that the first circuit input terminal 14, the filter capacitor 2, and the second circuit input terminal 15 are connected in series in sequence. The first circuit input terminal 14 and the second circuit input terminal 15 are respectively connected to the positive and negative electrodes of the DC power supply. At this time, the protection resistor 12 is equivalent to Figure 2 The connection loop shown is short-circuited, and the filter capacitor 2 is directly connected to the first circuit input terminal 14 and the second circuit input terminal 15 .

[0060] Specifically, when the discharge protection circuit 1 is just connected to the DC power supply through the first circuit input terminal 14 and the second circuit input terminal 15, there is a problem of excessive current. In order to prevent the excessive current in the circuit from damaging the filter capacitor 2, it is necessary to set a protective resistor 12 to limit the loop current. Therefore, the initial state of the startup protection switch 11 is the first switch state, that is, the first end and the third end of the startup protection switch 11 are in a normally closed state, and the first end and the second end of the startup protection switch 11 are in a normally open state. As the filter container is continuously charged in the connection loop, the voltage of the filter capacitor 2 gradually increases, and the equivalent resistance formed by it also gradually increases. When the filter capacitor 2 reaches the second preset voltage, the current in the connection loop will no longer damage the filter capacitor 2. Therefore, the protective resistor 12 is short-circuited from the connection loop, so that the filter capacitor 2 is directly connected to the first circuit input terminal 14 and the second circuit input terminal 15, and the startup protection process of the filter capacitor 2 is completed.

[0061] Figure 4 The connection circuit diagram of the discharge protection circuit 1 is as follows when the protection switch 11 is in the second switch state and the voltage of the filter capacitor 2 is greater than the first preset voltage threshold. Figure 4, when the protection switch 11 is started and is in the second switch state and the voltage of the filter capacitor 2 is greater than the first preset voltage threshold, the protection resistor 12 is connected in series with the discharge switch 13, so that the circuit formed by the protection resistor 12 and the discharge switch 13 is connected in parallel with the filter capacitor 2. At this time, since the voltage of the filter capacitor 2 is greater than the first preset voltage threshold, the discharge switch 13 is turned on, and the pressure relief protection circuit forms two parallel loops. Specifically, the first parallel loop is the first circuit input end 14, the filter capacitor 2, and the second circuit input end 15 connected in series in sequence, and the second parallel loop is the first circuit input end 14, the protection resistor 12, the discharge switch 13, and the second circuit input end 15 connected in series in sequence. Among them, since the protection resistor 12 is equivalent to being connected in parallel at both ends of the filter capacitor 2, it plays the role of a discharge resistor and can perform discharge protection on the filter capacitor 2.

[0062] Optionally, the protection resistor 12 is a cement resistor or an aluminum shell resistor.

[0063] In this embodiment, a protection resistor 12, a discharge switch 13, a start protection switch 11, a first circuit input terminal 14 and a second circuit input terminal 15 are provided; the first end of the protection resistor 12 is electrically connected to the first circuit input terminal 14, the second end of the protection resistor 12 is electrically connected to one end of the discharge switch 13, and the other end of the discharge switch 13 is electrically connected to one end of the filter capacitor 2 and the second circuit input terminal 15 respectively; the first end of the start protection switch 11 is electrically connected to the other end of the filter capacitor 2, the second end of the start protection switch 11 is electrically connected to the first end of the protection resistor 12, and the third end of the start protection switch 11 is electrically connected to the second end of the protection resistor 12; the first circuit input terminal 14 and the second circuit input terminal 15 are electrically connected to the two poles of the power supply; the start protection switch 11 is used to set to the first switch state or the second switch state according to the voltage of the filter capacitor 2; when in the first switch state, the start protection switch The first end of the start protection switch 11 and the third end of the start protection switch 11 are connected; when in the second switch state, the first end of the start protection switch 11 and the second end of the start protection switch 11 are connected; the protection resistor 12 is used to be connected in series with the filter capacitor 2 when the start protection switch 11 is in the first switch state, and is connected in series with the discharge switch 13 when the start protection switch 11 is in the second switch state and the voltage of the filter capacitor 2 is greater than the first preset voltage threshold, so that the circuit formed by the protection resistor 12 and the discharge switch 13 is connected in parallel with the filter capacitor 2; the discharge switch 13 is used to be turned on when the start protection switch 11 is in the second switch state and the voltage of the filter capacitor 2 is greater than the first preset voltage threshold, so that the start protection and discharge protection of the filter capacitor 2 can be realized by only one protection resistor 12 in the discharge protection circuit 1, thereby reducing the number of protection resistors 12 in the circuit, thereby saving space inside the equipment and reducing production and manufacturing costs.

[0064] Figure 5A schematic diagram of the structure of a discharge protection circuit 1 provided in another embodiment of the present invention is shown in FIG. Figure 5 As shown, the discharge protection circuit 1 provided in this embodiment is Figure 1 Based on the discharge protection circuit 1 provided in the illustrated embodiment, the discharge protection circuit 1 provided in the embodiment is further refined and expanded, and the discharge protection circuit 1 provided in the embodiment further includes:

[0065] A control device 16, one end of the control device 16 is electrically connected to the filter capacitor 2, and the other end is electrically connected to the start protection switch 11; the control device 16 is used to obtain the voltage of the filter capacitor 2, and if the voltage of the filter capacitor 2 is greater than the second preset voltage threshold, a state switching control instruction is sent to the start protection switch 11, and the second preset voltage threshold is less than the first preset voltage threshold; the start protection switch 11 is specifically used to switch the first switch state to the second switch state according to the state switching control instruction.

[0066] The control device 16 is electrically connected to the filter capacitor 2 and can obtain the voltage of the filter capacitor 2 . According to the voltage of the filter capacitor 2 , the control device 16 sends a state switching control instruction to the start protection switch 11 to change the state of the start protection switch 11 .

[0067] Specifically, according to the specific parameters of the filter capacitor 2, when the filter capacitor 2 is charged, the voltage of the filter capacitor 2 gradually increases, and its equivalent resistance gradually increases. Therefore, when its voltage increases to a certain preset value, it can be considered that it is safe to directly charge the filter capacitor 2 and will not cause damage to it. The preset value is the second preset voltage threshold. Therefore, when the voltage of the capacitor obtained by the control device 16 is greater than the second preset voltage threshold, a state switching control instruction is sent to the start protection switch 11 to switch it to the second switch state, that is, the protection resistor 12 is short-circuited, so that the filter capacitor 2 is directly electrically connected to the first circuit input terminal 14 and the second circuit input terminal 15.

[0068] The second preset voltage threshold is smaller than the first preset voltage threshold.

[0069] It can be understood that the first preset voltage threshold is a condition for triggering the discharge protection of the filter capacitor 2, that is, if the first preset voltage threshold is exceeded, the filter capacitor 2 may be damaged, such as breakdown, electric shock, etc. Therefore, the first preset voltage threshold is generally higher than the entire working voltage of the filter capacitor 2. The second preset voltage threshold is a condition for triggering the short circuit of the protection resistor 12. It is used to solve the problem that when the filter capacitor 2 is not charged, the resistance is very small when the filter capacitor 2 is just connected to the power supply, and it is easily damaged by a large current. As the filter capacitor 2 is charged, the voltage of the filter capacitor 2 will gradually increase to the working voltage. When the filter capacitor 2 reaches the second preset voltage threshold, the protection resistor 12 is short-circuited, which can improve the working efficiency of the circuit. Therefore, it can be determined that the second preset voltage threshold is less than the working voltage of the filter capacitor 2. The first preset voltage threshold and the second preset voltage threshold are threshold parameters set to achieve different purposes, and the second preset voltage threshold is less than the first preset voltage threshold.

[0070] Among them, the specific values ​​of the first preset voltage threshold and the second preset voltage threshold can be designed and selected according to specific needs and are not limited here.

[0071] Optionally, the starting protection switch 11 includes: a relay, and the state of the relay includes a normally open state and a normally closed state.

[0072] The relay is specifically used for when the protection switch 11 is started to be in the first switch state, the relay is in the normally open state; when the protection switch 11 is started to be in the second switch state, the relay is in the normally closed state.

[0073] Specifically, the relay has a first connection end, a second connection end and a third connection end, wherein the first connection end is electrically connected to the first end of the pneumatic protection switch, the second connection end is electrically connected to the second end of the pneumatic protection switch, and the third connection end is electrically connected to the third end of the pneumatic protection switch. Since the three connection ends of the relay correspond to the three ends of the start protection switch 11 in a one-to-one relationship, when the pneumatic protection switch is in the first switching state, the relay is in the first connection state, that is, the first connection end and the third connection end of the relay are connected; when the pneumatic protection switch of the relay is in the second switching state, the relay is in the second connection state, that is, the first connection end and the second connection end of the relay are connected.

[0074] The normally open state and normally closed state of the relay are relative to the first connection state and the second connection state of the relay, that is, if the relay is in the first connection state under the natural condition of no power, that is, the first connection end and the third connection end of the relay are connected, then the first connection state of the relay is in the normally closed state, and the second connection state is in the normally open state; if the relay is in the second connection state under the natural condition of no power, that is, the first connection end and the second connection end of the relay are connected, then the second connection state of the relay is in the normally closed state, and the first connection state is in the normally open state. The normally closed state or normally open state of the first connection state and the second connection state are opposite, and the first connection state and the second connection state cannot be in the normally open state or the normally closed state at the same time.

[0075] Optionally, the relay includes a normally open control contact and a normally closed control contact. When the normally open control contact is turned on, the relay is in a normally open state; correspondingly, when the normally closed control contact is turned on, the relay is in a normally closed state. Specifically, when the relay switches the connection state, it is triggered by the power being attracted. For example, the first connection end and the second connection end of the relay are attracted, so that the relay is in a second connection state. However, after the relay is switched to the second connection state, in order to maintain a stable connection of the relay, the second connection state needs to be set to a normally closed state. Here, the second connection state is set to a normally closed state by connecting the normally closed contact of the second connection state.

[0076] In a specific embodiment, the relay includes a first connection state normally closed contact and a second connection state normally closed contact. When the first connection state normally closed contact is turned on, the relay sets the first connection state to a normally closed state and the second connection state to a normally open state; when the second connection state normally closed contact is turned on, the relay sets the second connection state to a normally closed state and the first connection state to a normally open state; when both the first connection state normally closed contact and the second connection state normally closed contact are not turned on, the previous relay connection state is maintained in the normally open state or the normally closed state.

[0077] Of course, it is understandable that in the above specific embodiments, the first connection state or the second connection state can be set to a normally closed state by disconnecting the normally closed contact of the first connection state or the normally closed contact of the second connection state. The implementation process is similar to that in the above embodiments and will not be repeated here.

[0078] In this embodiment, by setting a normally open state and a normally closed state for the first connection state or the second connection state of the relay, the relay is placed in different connection states, thereby realizing the reuse of the protection resistor 12, so that the startup protection and the discharge protection in the discharge protection circuit 1 can share a protection resistor 12, thereby reducing costs and saving internal space of the device.

[0079] Optionally, the other end of the control device 16 is also electrically connected to the discharge switch 13 .

[0080] The control device 16 is further configured to send a closing control instruction to the discharge switch 13 if the voltage of the filter capacitor 2 is greater than a first preset voltage threshold.

[0081] The discharge switch 13 is specifically configured to be turned on according to a closing control instruction.

[0082] Specifically, when the voltage of the filter capacitor 2 is greater than the first preset voltage threshold, it indicates that the voltage of the filter capacitor 2 is too high, exceeding the normal working voltage, and may damage the filter capacitor 2. At this time, the control device 16 sends a closing control instruction to the discharge switch 13 to turn on the discharge switch 13. After turning on, the discharge switch 13 and the protection resistor 12 form a discharge protection circuit in parallel with the filter capacitor 2, thereby realizing the discharge protection of the filter capacitor 2. The specific connection method is as follows Figure 4 The connection circuit diagram of the discharge protection circuit 1 shown is similar and will not be described again here.

[0083] Optionally, the discharge switch 13 includes: a MOS tube. When the MOS tube is turned on, the discharge switch 13 is turned on, thereby realizing a discharge protection circuit. The conduction mode of the MOS tube can be that when the voltage is greater than a first preset voltage threshold, the MOS tube is always in a conduction state, or the MOS tube is turned on by chopping at a certain frequency.

[0084] Figure 6 A schematic diagram of a filter circuit according to an embodiment of the present invention is shown in FIG. Figure 6 As shown, the filter circuit provided in this embodiment includes: a filter capacitor 2 and a filter capacitor 2. Figure 1-Figure 5 The discharge protection circuit 1 provided in any one of the corresponding embodiments.

[0085] The discharge protection circuit 1 is electrically connected to the filter capacitor 2, wherein the specific connection method between the discharge protection circuit 1 and the filter capacitor 2 is as follows: Figure 1-Figure 5 The connection method between the discharge protection circuit 1 and the filter capacitor 2 in the corresponding embodiment is the same, which will not be repeated here.

[0086] Figure 7 A structural diagram of a rectifier device provided by an embodiment of the present invention is shown in FIG. Figure 7 As shown, the rectifier device provided in this embodiment includes: a rectifier circuit and Figure 6 The filter circuit provided in the embodiment shown in FIG.

[0087] The input end of the rectifier circuit is connected to the AC power supply, and the output end of the rectifier circuit is electrically connected to the first circuit input end 14 and the second circuit input end 15 of the filter circuit respectively.

[0088] The rectifier circuit is used to rectify the input AC power and output DC power.

[0089] Figure 8 A schematic diagram of the structure of a control system provided by an embodiment of the present invention is shown in FIG. Figure 8 As shown, the control system provided in this embodiment includes: an AC power supply, a load device and Figure 7 The embodiment shown in FIG. 1 provides a rectifying device.

[0090] Among them, the AC power supply, the rectifier device and the load equipment are electrically connected in sequence.

[0091] AC power supply is used to supply power to load equipment through a rectifier.

[0092] One embodiment of the present invention provides a bar tacking machine, comprising: Figure 8 The control system provided by the embodiment shown in .

[0093] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and systems can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules is only a logical function division, and there may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0094] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention is indicated by the following claims.

[0095] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A discharge protection circuit, characterized in that: include: A protection resistor, a discharge switch, a start protection switch, a first circuit input terminal and a second circuit input terminal; The first end of the protection resistor is electrically connected to the first circuit input end, the second end of the protection resistor is electrically connected to one end of the discharge switch, and the other end of the discharge switch is electrically connected to one end of the filter capacitor and the second circuit input end respectively; the first end of the startup protection switch is electrically connected to the other end of the filter capacitor, the second end of the startup protection switch is electrically connected to the first end of the protection resistor, and the third end of the startup protection switch is electrically connected to the second end of the protection resistor; The first circuit input terminal and the second circuit input terminal are electrically connected to two poles of a power supply respectively; The startup protection switch is used to be set to a first switch state or a second switch state according to the voltage of the filter capacitor; When in the first switch state, the first end of the startup protection switch and the third end of the startup protection switch are connected; when in the second switch state, the first end of the startup protection switch and the second end of the startup protection switch are connected; The protection resistor is used to be connected in series with the filter capacitor when the protection switch is in the first switch state, and connected in series with the discharge switch when the protection switch is in the second switch state and the voltage of the filter capacitor is greater than the first preset voltage threshold, so that the circuit formed by the protection resistor and the discharge switch is connected in parallel with the filter capacitor; A discharge switch, configured to be turned on when the startup protection switch is in the second switch state and the voltage of the filter capacitor is greater than a first preset voltage threshold; Also includes: A control device, one end of which is electrically connected to the filter capacitor, and the other end of which is electrically connected to the start protection switch; The control device is used to obtain the voltage of the filter capacitor, and send a state switching control instruction to the startup protection switch if the voltage of the filter capacitor is greater than a second preset voltage threshold, and the second preset voltage threshold is less than the first preset voltage threshold; The startup protection switch is specifically used to switch the first switch state to the second switch state according to the state switching control instruction; The startup protection switch includes: a relay, wherein the state of the relay includes a normally open state and a normally closed state; When the startup protection switch is in the first switch state, the relay is in the normally open state; when the startup protection switch is in the second switch state, the relay is in the normally closed state; The other end of the control device is also electrically connected to the discharge switch; The control device is further configured to send a closing control instruction to the discharge switch if the voltage of the filter capacitor is greater than a first preset voltage threshold; The discharge switch is used to be turned on according to the closing control instruction.

2. The circuit according to claim 1, characterized in that The discharge switch includes: a MOS tube.

3. The circuit according to any one of claims 1 to 2, characterized in that: The protective resistor is a cement resistor or an aluminum shell resistor.

4. A filter circuit, characterized in that: include: A filter capacitor, and a discharge protection circuit as described in any one of claims 1 to 3; The discharge protection circuit is electrically connected to the filter capacitor.

5. A rectifying device, characterized in that: include: A rectifier circuit and a filter circuit as claimed in claim 4; The input end of the rectifier circuit is connected to an AC power source, and the output end of the rectifier circuit is electrically connected to a first circuit input end and a second circuit input end of the filter circuit respectively; The rectifier circuit is used to rectify the input AC power supply and output DC power supply.

6. A control system, characterized in that: include: An AC power source, a load device, and a rectifier device as claimed in claim 5; The AC power source, the rectifier device, and the load device are electrically connected in sequence; The AC power supply is used to supply power to the load device through the rectifier.

7. A bar tacking machine, characterized in that: Comprising a control system as claimed in claim 6.

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