CN110783905A - Bleeder protection circuit, filter circuit, rectifier, control system and noose machine - Google Patents
Bleeder protection circuit, filter circuit, rectifier, control system and noose machine Download PDFInfo
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- CN110783905A CN110783905A CN201911222901.4A CN201911222901A CN110783905A CN 110783905 A CN110783905 A CN 110783905A CN 201911222901 A CN201911222901 A CN 201911222901A CN 110783905 A CN110783905 A CN 110783905A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention provides a bleeder protection circuit, a filter circuit, a rectifying device, a control system and a bar tacking machine, which are characterized in that a protection resistor, a bleeder switch, a starting 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 with the input end of the first circuit, the second end of the protection resistor is electrically connected with one end of the bleeder switch, and the other end of the bleeder switch is respectively electrically connected with one end of the filter capacitor and the input end of the second circuit; the first end of the starting protection switch is electrically connected with the other end of the filter capacitor, the second end of the starting protection switch is electrically connected with the first end of the protection resistor, and the third end of the starting protection switch is electrically connected with the second end of the protection resistor, so that the starting protection and the discharge protection of the filter capacitor can be realized only through one protection resistor in the discharge protection circuit, the number of the protection resistors in the circuit is reduced, therefore, the space inside the equipment is saved, and the production and manufacturing cost is reduced.
Description
Technical Field
The invention relates to the technical field of sewing, in particular to a discharge protection circuit, a filter circuit, a rectifying device, a control system and a bar tacking machine.
Background
When a control device or a control system is just connected to a power supply, a large current impact may occur, and damage may be caused to a circuit system, so in the design of the control system, a protection measure is usually set in a circuit, and similarly, in a circuit with energy feedback, a protection measure is also set correspondingly in order to prevent the loss of the circuit system caused by the energy feedback.
In the field of sewing/sewing technology, it is a common technical means to apply start protection and overvoltage protection to a control system, and it is a common practice to separately provide a protection resistor for start protection and a protection resistor for discharging electrical energy, for example, in a control system of a bar tacking machine, protection resistors for start protection and overvoltage protection are separately provided.
However, as the precision degree of the control system is higher and higher, the internal space of the control system is smaller and smaller, and the protection resistor is usually large in size and high in power, so that the internal space of the device is wasted, and the manufacturing and production costs are increased.
Disclosure of Invention
In view of the above, the present invention provides a leakage protection circuit, a filter circuit, a rectifying device, a control system and a bar tacking machine, so as to solve the problems of waste of internal space of the device and increase of manufacturing and production costs.
According to a first aspect of the embodiments of the present disclosure, the present disclosure provides a bleeding protection circuit, including:
the protection circuit comprises a protection resistor, a bleeder switch, a starting protection switch, a first circuit input end and a second circuit input end;
the first end of the protection resistor is electrically connected with the input end of the first circuit, the second end of the protection resistor is electrically connected with one end of the bleeder switch, and the other end of the bleeder switch is respectively electrically connected with one end of the filter capacitor and the input end of the second circuit; a first end of the starting protection switch is electrically connected with the other end of the filter capacitor, a second end of the starting protection switch is electrically connected with a first end of the protection resistor, and a third end of the starting protection switch is electrically connected with a second end of the protection resistor;
the first circuit input end and the second circuit input end are correspondingly and electrically connected with two poles of a power supply;
the starting protection switch is used for setting to be in a first switch state or a second switch state according to the voltage of the filter capacitor; when the starting protection switch is in a first switch state, the first end of the starting protection switch and the third end of the starting protection switch are conducted; when the starting protection switch is in a second switch state, the first end of the starting protection switch is conducted with the second end of the starting protection switch;
the protection resistor is used for being connected with the filter capacitor in series when the starting protection switch is in a first switch state, and is connected with the bleeder switch in series when the starting protection switch is in a second switch state and the voltage of the filter capacitor is greater than a first preset voltage threshold value, so that a circuit formed by the protection resistor and the bleeder switch is connected with the filter capacitor in parallel;
and the bleeder switch is used for being switched on when the starting protection switch is in a second switch state and the voltage of the filter capacitor is greater than a first preset voltage threshold value.
Optionally, the bleeding protection circuit further includes:
one end of the control device is electrically connected with the filter capacitor, and the other end of the control device is electrically connected with the starting protection switch;
the control device is used for acquiring the voltage of the filter capacitor, and if the voltage of the filter capacitor is greater than a second preset voltage threshold value, sending a state switching control instruction to the starting protection switch, wherein the second preset voltage threshold value is smaller than the first preset voltage threshold value;
the start protection switch is specifically configured to switch the first switching state to the second switching state according to the state switching control instruction.
Optionally, the start protection switch comprises: the relay, the state of the said relay includes the normally open state and normally closed state;
the relay is specifically used for being in a normally open state when the starting protection switch is in a first switch state; when the starting protection switch is in a second switch state, the relay is in a normally closed state.
Optionally, the other end of the control device is also electrically connected with the bleeder switch;
the control device is further configured to send a closing control instruction to the bleeder switch if the voltage of the filter capacitor is greater than a first preset voltage threshold;
and the bleeder switch is specifically used for conducting according to the closing control instruction.
Optionally, the bleed switch comprises: and a MOS tube.
Optionally, the protection resistor is a cement resistor or an aluminum-shell resistor.
According to a second aspect of the embodiments of the present disclosure, there is provided a filter circuit including: a filter capacitor and a bleeder protection circuit as defined in any one of the first aspects of the embodiments of the present disclosure.
The leakage protection circuit is electrically connected with the filter capacitor.
According to a third aspect of the disclosed embodiments, the present invention provides a rectifying device, including: a rectifier circuit and a filter circuit as described in the second aspect of the disclosed embodiment.
The input end of the rectifying circuit is connected with an alternating current power supply, and the output end of the rectifying circuit is respectively and electrically connected with the first circuit input end and the second circuit input end of the filter circuit.
The rectification circuit is used for rectifying the input alternating current power supply and outputting a direct current power supply.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a control system including: an alternating current power supply, a load device and a rectifying device according to the second aspect of the embodiment of the disclosure.
The alternating current power supply, the rectifying device and the load equipment are electrically connected in sequence.
And the alternating current power supply is used for supplying power to the load equipment through the rectifying device.
According to a fifth aspect of the embodiments of the present disclosure, the present disclosure provides a bar tacking machine including the control system as described in the fourth aspect of the embodiments of the present disclosure.
The invention provides a leakage protection circuit, a filter circuit, a rectifying device, a control system and a bar tacking machine, wherein a protection resistor, a leakage switch, a starting 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 with the input end of the first circuit, the second end of the protection resistor is electrically connected with one end of the bleeder switch, and the other end of the bleeder switch is respectively electrically connected with one end of the filter capacitor and the input end of the second circuit; a first end of the starting protection switch is electrically connected with the other end of the filter capacitor, a second end of the starting protection switch is electrically connected with a first end of the protection resistor, and a third end of the starting protection switch is electrically connected with a second end of the protection resistor; the first circuit input end and the second circuit input end are correspondingly and electrically connected with two poles of a power supply; the starting protection switch is used for setting to be in a first switch state or a second switch state according to the voltage of the filter capacitor; when the starting protection switch is in a first switch state, the first end of the starting protection switch and the third end of the starting protection switch are conducted; when the starting protection switch is in a second switch state, the first end of the starting protection switch is conducted with the second end of the starting protection switch; the protection resistor is used for being connected with the filter capacitor in series when the starting protection switch is in a first switch state, and is connected with the bleeder switch in series when the starting protection switch is in a second switch state and the voltage of the filter capacitor is greater than a first preset voltage threshold value, so that a circuit formed by the protection resistor and the bleeder switch is connected with the filter capacitor in parallel; and the bleeder switch is used for being switched on when the starting protection switch is in a second switch state and the voltage of the filter capacitor is greater than a first preset voltage threshold value, so that the starting protection and the bleeder protection of the filter capacitor can be realized only through one protection resistor in the bleeder protection circuit, the number of the protection resistors in the circuit is reduced, the space in the equipment is saved, and the production and manufacturing cost is reduced.
Drawings
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 disclosure.
Fig. 1 is a schematic structural diagram of a leakage protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a connection loop of the bleeder protection circuit in the embodiment shown in fig. 1, when the protection switch is activated in the first switching state;
fig. 3 is a schematic diagram of a connection loop of the bleeder protection circuit when the start-up protection switch is in the second switching state and the voltage of the filter capacitor is not greater than the first predetermined voltage threshold in the embodiment shown in fig. 1;
fig. 4 is a schematic diagram of a connection loop of the bleeder protection circuit when the start-up protection switch is in the second switching state and the voltage of the filter capacitor is greater than the first predetermined voltage threshold in the embodiment shown in fig. 1;
fig. 5 is a schematic structural diagram of a leakage protection circuit according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a filter circuit according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a rectifying device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a control system according to an embodiment of the present invention.
While specific embodiments of the disclosure have been shown and described in detail in the drawings and foregoing description, such drawings and description are not intended to limit the scope of the disclosed concepts in any way, but rather to explain the concepts of the disclosure to those skilled in the art by reference to the particular embodiments.
Reference numerals:
1: a bleed-off protection circuit; 11: starting a protection switch; 12: a protection resistor; 13: a bleeder switch; 14: a first circuit input; 15: a second circuit input; 16: a control device;
2: and a filter capacitor.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of devices and systems consistent with certain aspects of the present disclosure, as detailed in the appended claims.
In the prior art, in order to solve the problems of excessive starting current and energy feedback in a circuit, corresponding starting protection and leakage protection are usually set, and in the circuit for starting protection and leakage protection, protection resistors for realizing starting protection and leakage protection are respectively set. However, the protection resistor in the start protection circuit plays a role of protection only when the circuit is connected to a power supply, and along with the stable start of the circuit, the protection resistor in the start protection circuit is short-circuited by the relay, so that the start protection circuit is always in an idle state, and the utilization rate of the protection resistor in the start protection circuit is low. Meanwhile, due to the existence of the protection resistor in the starting protection, when the system is just started, the discharge protection cannot be triggered, so that the starting protection and the discharge protection cannot be triggered simultaneously, and the number of the protection resistors can be reduced by sharing one protection resistor through the starting protection and the discharge protection. The problem of how to realize start-up protection and leakage protection in a circuit through a protection resistor is faced at present.
The following describes the technical solutions of the present invention and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a leakage protection circuit according to an embodiment of the present invention, and as shown in fig. 1, the leakage protection circuit 1 according to the embodiment includes:
a protection resistor 12, a bleeder switch 13, a start-up protection switch 11, a first circuit input 14 and a second circuit input 15.
A first end of the protection resistor 12 is electrically connected with the first circuit input end 14, a second end of the protection resistor 12 is electrically connected with one end of the bleeder switch 13, and the other end of the bleeder switch 13 is electrically connected with one end of the filter capacitor 2 and the second circuit input end 15 respectively; the first end of the starting protection switch 11 is electrically connected with the other end of the filter capacitor 2, the second end of the starting protection switch 11 is electrically connected with the first end of the protection resistor 12, and the third end of the starting protection switch 11 is electrically connected with the second end of the protection resistor 12.
A first circuit input terminal 14 and a second circuit input terminal 15, electrically connected to the two poles of the power supply; specifically, the first circuit input end 14 is connected to the positive pole of the dc power supply, and the second circuit input end 15 is connected to the negative pole of the dc power supply, or of course, the first circuit input end 14 may be connected to the negative pole of the dc power supply, and the second circuit input end 15 may be connected to the positive pole of the dc power supply, and the electrical connection manner connecting the first circuit input end 14 and the second circuit input end 15 to the positive pole and the negative pole of the dc power supply may be adjusted according to specific needs, and is not limited herein.
The starting protection switch 11 is used for setting to be in a first switch state or a second switch state according to the voltage of the filter capacitor 2; when the protection switch is in the first switch state, the first end of the starting protection switch 11 and the third end of the starting protection switch 11 are conducted; in the second switching state, the first terminal of the start protection switch 11 and the second terminal of the start protection switch 11 are turned on.
The starting protection switch 11 at least has a first switch state and a second switch state, and when the starting protection switch 11 is in different states, the corresponding connection state of the pressure relief protection circuit is changed along with the first switch state and the second switch state, so that different circuit functions are realized.
And the protection resistor 12 is used for being connected with the filter capacitor 2 in series when the start protection switch 11 is in the first switch state, and is connected with the bleeder switch 13 in series 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 value, so that a circuit formed by the protection resistor 12 and the bleeder switch 13 is connected with the filter capacitor 2 in parallel.
And the bleeder switch 13 is used for being switched on when the starting protection switch 11 is in the second switching state and the voltage of the filter capacitor 2 is greater than the first preset voltage threshold value.
Fig. 2 is a schematic diagram of a connection loop of the leakage protection circuit 1 when the start protection switch 11 is in the first switch state, and as shown in fig. 2, when the start protection switch 11 is in the first state, the first end of the start protection switch 11 and the third end of the start protection switch 11 are connected, the leakage switch 13 is disconnected, and at this time, the connection loop of the leakage protection circuit is that the first circuit input end 14, the protection resistor 12, the filter capacitor 2, and the second circuit input end 15 are sequentially connected in series. The first circuit input end 14 and the second circuit input end 15 are respectively connected with the positive electrode and the negative electrode of the direct current power supply, and the protection resistor 12 is connected in series in the connection loop, so that when the connection loop is connected with direct current through the first circuit input end 14 and the second circuit input end 15, the protection resistor 12 has a large resistance value, the current of the connection loop can be reduced, and the protection of the filter capacitor 2 is realized.
Fig. 3 is a schematic diagram of a connection loop of the bleeder protection circuit 1 when the start 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, as shown in fig. 3, when the start 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 start protection switch 11 is connected with the second end of the start protection switch 11, the bleeder switch 13 is disconnected, at this time, the connection loop of the bleeder protection circuit is that the first circuit input end 14, the filter capacitor 2 and the second circuit input end 15 are sequentially connected in series. The first circuit input end 14 and the second circuit input end 15 are respectively connected with the positive pole and the negative pole of the direct current power supply. In this case, the protective resistor 12 is short-circuited in the connection circuit shown in fig. 2, and the filter capacitor 2 is directly connected to the first circuit input terminal 14 and the second circuit input terminal 15.
Specifically, when the bleeder 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, the current is too large, and the protection resistor 12 is required to limit the loop current in order to prevent the filter capacitor 2 from being damaged by the too large current in the circuit. Therefore, the initial state of the starting protection switch 11 is the first switch state, that is, the first end and the third end of the starting protection switch 11 are in the normally closed state, and the first end and the second end of the starting protection switch 11 are in the normally open state. With the continuous charging of the filter capacitor in the connection loop, the voltage of the filter capacitor 2 gradually rises, the equivalent resistance formed by the filter capacitor 2 also gradually becomes larger, and when the filter capacitor 2 reaches the second preset voltage, the current in the connection loop can not damage the filter capacitor 2 any more, so that the protection resistor 12 is short-circuited from the connection loop, the filter capacitor 2 is directly connected with the first circuit input end 14 and the second circuit input end 15, and the start protection process of the filter capacitor 2 is completed.
Fig. 4 is a schematic diagram of a connection loop of the bleed-off protection circuit 1 when the start protection switch 11 is in the second switching state and the voltage of the filter capacitor 2 is greater than the first preset voltage threshold, and as shown in fig. 4, when the start protection switch 11 is in the second switching 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 bleed-off switch 13, so that a circuit formed by the protection resistor 12 and the bleed-off switch 13 is connected in parallel with the filter capacitor 2. At this time, because the voltage of the filter capacitor 2 is greater than the first preset voltage threshold, the bleeder switch 13 is turned on, and the pressure relief protection circuit forms two parallel circuits, specifically, the first parallel circuit is formed by sequentially connecting the first circuit input end 14, the filter capacitor 2, and the second circuit input end 15 in series, and the second parallel circuit is formed by sequentially connecting the first circuit input end 14, the protection resistor 12, the bleeder switch 13, and the second circuit input end 15 in series. The protection resistor 12 is connected in parallel to two ends of the filter capacitor 2, and plays a role of a bleed-off resistor, so that the filter capacitor 2 can be subjected to bleed-off protection.
Optionally, the protection resistor 12 is a cement resistor or an aluminum-case resistor.
In this embodiment, a protection resistor 12, a bleeder switch 13, a start protection switch 11, a first circuit input end 14, and a second circuit input end 15 are provided; a first end of the protection resistor 12 is electrically connected with the first circuit input end 14, a second end of the protection resistor 12 is electrically connected with one end of the bleeder switch 13, and the other end of the bleeder switch 13 is electrically connected with one end of the filter capacitor 2 and the second circuit input end 15 respectively; a first end of the starting protection switch 11 is electrically connected with the other end of the filter capacitor 2, a second end of the starting protection switch 11 is electrically connected with a first end of the protection resistor 12, and a third end of the starting protection switch 11 is electrically connected with a second end of the protection resistor 12; a first circuit input terminal 14 and a second circuit input terminal 15, electrically connected to the two poles of the power supply; the starting protection switch 11 is used for setting to be in a first switch state or a second switch state according to the voltage of the filter capacitor 2; when the protection switch is in the first switch state, the first end of the starting protection switch 11 and the third end of the starting protection switch 11 are conducted; when the protection switch is in the second switch state, the first end of the start protection switch 11 is conducted with the second end of the start protection switch 11; the protection resistor 12 is used for being connected with the filter capacitor 2 in series when the starting protection switch 11 is in a first switch state, and is connected with the bleeder switch 13 in series when the starting protection switch 11 is in a second switch state and the voltage of the filter capacitor 2 is greater than a first preset voltage threshold value, so that a circuit formed by the protection resistor 12 and the bleeder switch 13 is connected with the filter capacitor 2 in parallel; and the bleeder switch 13 is used for being switched on when the starting protection switch 11 is in a second switching state and the voltage of the filter capacitor 2 is greater than a first preset voltage threshold value, so that the starting protection and the bleeder protection of the filter capacitor 2 can be realized only by one protection resistor 12 in the bleeder protection circuit 1, and the number of the protection resistors 12 in the circuit is reduced, thereby saving the space in the equipment and reducing the production and manufacturing cost.
Fig. 5 is a schematic structural diagram of a leakage protection circuit 1 according to another embodiment of the present invention, and as shown in fig. 5, the leakage protection circuit 1 provided in this embodiment is further refined and expanded on the basis of the leakage protection circuit 1 provided in the embodiment shown in fig. 1, and then the leakage protection circuit 1 provided in this embodiment further includes:
one end of the control device 16 is electrically connected with the filter capacitor 2, and the other end of the control device 16 is electrically connected with the starting protection switch 11; the control device 16 is configured to obtain a voltage of the filter capacitor 2, and send a state switching control instruction to the start protection switch 11 if the voltage of the filter capacitor 2 is greater than a second preset voltage threshold, where the second preset voltage threshold is smaller than the first preset voltage threshold; the protection switch 11 is activated, and is specifically configured to switch the first switching state to the second switching state according to the state switching control instruction.
The control device 16 is electrically connected with the filter capacitor 2, and can obtain the voltage of the filter capacitor 2, and send a state switching control instruction to the start protection switch 11 according to the voltage condition of the filter capacitor 2, so that the state of the start protection switch 11 changes.
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 the equivalent resistance thereof also gradually increases, so that when the voltage of the filter capacitor 2 increases to a certain preset value, it can be considered that it is safe to directly charge the filter capacitor 2, and the preset value is a second preset voltage threshold value, and will not damage the filter capacitor. 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 the start protection switch to the second switch state, that is, the protection resistor 12 is short-circuited, so that the filter capacitor 2 is directly and electrically connected to the first circuit input terminal 14 and the second circuit input terminal 15.
The second preset voltage threshold is smaller than the first preset voltage threshold.
It is 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, damage, such as breakdown, electric shock, etc., may be generated to the filter capacitor 2, and therefore, the first preset voltage threshold is generally higher than the entire operating voltage of the filter capacitor 2. The second preset voltage threshold is a condition for triggering the short circuit of the protection resistor 12, and is used for solving the problem that when the circuit is just connected to a power supply, the resistance of the filter capacitor 2 is very small when the filter capacitor 2 is not charged, and the filter capacitor is easily damaged by a large current, along with the charging of the filter capacitor 2, the voltage of the filter capacitor 2 can be gradually increased to the working voltage, and when the filter capacitor 2 is set to reach the second preset voltage threshold, the protection resistor 12 is short-circuited, so that the working efficiency of the circuit can be improved, and therefore, the second preset voltage threshold can be determined to be smaller than the working voltage of the filter capacitor 2. The first preset voltage threshold and the second preset voltage threshold are threshold parameters set for different purposes, and the second preset voltage threshold is smaller than the first preset voltage threshold.
The specific values of the first preset voltage threshold and the second preset voltage threshold may be designed and selected according to specific requirements, which is not limited herein.
Optionally, activating the protection switch 11 comprises: the relay, the state of relay includes normally open state and normally closed state.
The relay is specifically used for being in a normally open state when the starting protection switch 11 is in a first switch state; when the protection switch 11 is turned on to the second switching state, the relay is in the normally closed state.
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 with the first end of the pneumatic protection switch, the second connection end is electrically connected with the second end of the pneumatic protection switch, and the third connection end is electrically connected with the third end of the pneumatic protection switch. Because the three connecting ends of the relay and the three ends of the starting protection switch 11 are in one-to-one correspondence, when the pneumatic protection switch is in the first switch state, the relay is in the first connecting state, that is, the first connecting end and the third connecting end of the relay are conducted; when the pneumatic protection switch of the relay is in the second switch state, the relay is in the second connection state, namely the first connection end and the second connection end of the relay are conducted.
The normally open state and the normally closed state of the relay are relative to a first connection state and a second connection state of the relay, namely, if the relay is in the first connection state under the natural condition of no energization, namely the first connection end and the third connection end of the relay are conducted, 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 supply, namely the first connection end and the second connection end of the relay are connected, 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 the 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.
Optionally, the relay includes a normally open control contact and a normally closed control contact. When the normally open control contact is conducted, the relay is in a normally open state; correspondingly, when the normally closed control contact is conducted, the relay is in a normally closed state. Specifically, when the relay performs connection state switching, the relay is triggered by electric power actuation, for example, the first connection end and the second connection end of the relay are actuated to make the relay in the second connection state. However, after the relay is switched to the second connection state, in order to maintain the stable connection of the relay, the second connection state needs to be set to the normally closed state, and here, the second connection state is set to the normally closed state by turning on the normally closed contact of the second connection state.
In one specific embodiment, the relay includes a first connection state normally closed contact and a second connection state normally closed contact, and 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 normally closed contact of the second connection state is conducted, the relay sets the second connection state to be a normally closed state, and the first connection state to be a normally open state; when the first connection state normally closed contact and the second connection state normally closed contact are not conducted, the normally open state or the normally closed state of the previous relay connection state is maintained.
Of course, it is understood that, in the above specific embodiment, the first connection state or the second connection state may be set to be the normally closed state by disconnecting the normally closed contact in the first connection state or the normally closed contact in the second connection state, and an implementation process thereof is similar to that in the above embodiment, and is not described here again.
In this embodiment, the normally open state and the normally closed state are set for the first connection state or the second connection state of the relay, so that the relay is in different connection states, thereby realizing multiplexing of the protection resistor 12, enabling the start protection and the discharge protection in the discharge protection circuit 1 to share one protection resistor 12, reducing the cost, and saving the inner space of the device.
Optionally, the other end of the control device 16 is also electrically connected to the bleeder switch 13.
The control device 16 is further configured to send a closing control instruction to the bleeder switch 13 if the voltage of the filter capacitor 2 is greater than the first preset voltage threshold.
And the release switch 13 is specifically used for conducting according to a closing control instruction.
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 and exceeds the normal operating voltage, and the filter capacitor 2 may be damaged. At this time, the control device 16 sends a closing control instruction to the bleed-off switch 13 to turn on the bleed-off switch 13, and after the on state, the bleed-off switch 13 and the protection resistor 12 form a bleed-off protection circuit connected in parallel with the filter capacitor 2, so as to implement the bleed-off protection of the filter capacitor 2. The specific connection manner is similar to the schematic connection circuit diagram of the leakage protection circuit 1 shown in fig. 4, and is not described herein again.
Optionally, the bleed switch 13 comprises: when the MOS transistor is switched on, the bleeder switch 13 is switched on, so that a bleeder protection circuit is realized, and the MOS transistor is always in a conducting state when the conducting mode of the MOS transistor is greater than a first preset voltage threshold value, or the MOS transistor is switched on in a chopping mode with a certain frequency.
Fig. 6 is a schematic structural diagram of a filter circuit according to an embodiment of the present invention, and as shown in fig. 6, the filter circuit according to the embodiment includes: a filter capacitor 2 and a bleeder protection circuit 1 as provided in any of the embodiments corresponding to fig. 1-5 for implementing the present invention.
The leakage protection circuit 1 is electrically connected to the filter capacitor 2, wherein a specific connection manner of the leakage protection circuit 1 and the filter capacitor 2 is the same as that of the leakage protection circuit 1 and the filter capacitor 2 in the embodiments corresponding to fig. 1 to fig. 5, and details thereof are not repeated here.
Fig. 7 is a schematic structural diagram of a rectifying device according to an embodiment of the present invention, and as shown in fig. 7, the rectifying device according to the embodiment includes: a rectifier circuit and a filter circuit as provided in the embodiment shown in fig. 6.
The input end of the rectifying circuit is connected with an alternating current power supply, and the output end of the rectifying circuit is respectively and electrically connected with the first circuit input end 14 and the second circuit input end 15 of the filter circuit.
And the rectifying circuit is used for rectifying the input alternating current power supply and outputting a direct current power supply.
Fig. 8 is a schematic structural diagram of a control system according to an embodiment of the present invention, and as shown in fig. 8, the control system according to the embodiment includes: an alternating current power supply, a load device and a rectifying device provided as in the embodiment shown in fig. 7.
Wherein, alternating current power supply, rectifying device, load equipment are connected electrically in proper order.
And the alternating current power supply is used for supplying power to the load equipment through the rectifying device.
One embodiment of the present invention provides a bar tacking machine including a control system as provided in the embodiment shown in fig. 8.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and system may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of modules is merely a division of logical functions, and an actual implementation may have another division, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements 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 invention is limited only by the appended claims.
Claims (10)
1. A bleed protection circuit, comprising: the protection circuit comprises a protection resistor, a bleeder switch, a starting protection switch, a first circuit input end and a second circuit input end;
the first end of the protection resistor is electrically connected with the input end of the first circuit, the second end of the protection resistor is electrically connected with one end of the bleeder switch, and the other end of the bleeder switch is respectively electrically connected with one end of the filter capacitor and the input end of the second circuit; a first end of the starting protection switch is electrically connected with the other end of the filter capacitor, a second end of the starting protection switch is electrically connected with a first end of the protection resistor, and a third end of the starting protection switch is electrically connected with a second end of the protection resistor;
the first circuit input end and the second circuit input end are correspondingly and electrically connected with two poles of a power supply;
the starting protection switch is used for setting to be in a first switch state or a second switch state according to the voltage of the filter capacitor; when the starting protection switch is in a first switch state, the first end of the starting protection switch and the third end of the starting protection switch are conducted; when the starting protection switch is in a second switch state, the first end of the starting protection switch is conducted with the second end of the starting protection switch;
the protection resistor is used for being connected with the filter capacitor in series when the starting protection switch is in a first switch state, and is connected with the bleeder switch in series when the starting protection switch is in a second switch state and the voltage of the filter capacitor is greater than a first preset voltage threshold value, so that a circuit formed by the protection resistor and the bleeder switch is connected with the filter capacitor in parallel;
and the bleeder switch is used for being switched on when the starting protection switch is in a second switch state and the voltage of the filter capacitor is greater than a first preset voltage threshold value.
2. The circuit of claim 1, further comprising:
one end of the control device is electrically connected with the filter capacitor, and the other end of the control device is electrically connected with the starting protection switch;
the control device is used for acquiring the voltage of the filter capacitor, and if the voltage of the filter capacitor is greater than a second preset voltage threshold value, sending a state switching control instruction to the starting protection switch, wherein the second preset voltage threshold value is smaller than the first preset voltage threshold value;
the start protection switch is specifically configured to switch the first switching state to the second switching state according to the state switching control instruction.
3. The circuit of claim 2, wherein the enabling protection switch comprises: the relay, the state of the said relay includes the normally open state and normally closed state;
when the starting protection switch is in a first switch state, the relay is in a normally open state; when the starting protection switch is in a second switch state, the relay is in a normally closed state.
4. The circuit of claim 2,
the other end of the control device is also electrically connected with the bleeder switch;
the control device is further configured to send a closing control instruction to the bleeder switch if the voltage of the filter capacitor is greater than a first preset voltage threshold;
and the bleeder switch is used for conducting according to the closing control instruction.
5. The circuit of claim 1, wherein the bleed switch comprises: and a MOS tube.
6. The circuit according to any of claims 1-5, wherein the protective resistor is a cement resistor or an aluminum-clad resistor.
7. A filter circuit, comprising: a filter capacitor, and a bleed off protection circuit as claimed in any one of claims 1-6;
the leakage protection circuit is electrically connected with the filter capacitor.
8. A fairing, comprising: a rectifying circuit and a filter circuit according to claim 7;
the input end of the rectifying circuit is connected with an alternating current power supply, and the output end of the rectifying circuit is respectively and electrically connected with the first circuit input end and the second circuit input end of the filter circuit;
the rectification circuit is used for rectifying the input alternating current power supply and outputting a direct current power supply.
9. A control system, comprising: an alternating current power supply, a load device and a rectifying device according to claim 8;
the alternating current power supply, the rectifying device and the load equipment are electrically connected in sequence;
and the alternating current power supply is used for supplying power to the load equipment through the rectifying device.
10. A bar tacking machine, comprising the control system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911222901.4A CN110783905A (en) | 2019-12-03 | 2019-12-03 | Bleeder protection circuit, filter circuit, rectifier, control system and noose machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911222901.4A CN110783905A (en) | 2019-12-03 | 2019-12-03 | Bleeder protection circuit, filter circuit, rectifier, control system and noose machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110783905A true CN110783905A (en) | 2020-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911222901.4A Pending CN110783905A (en) | 2019-12-03 | 2019-12-03 | Bleeder protection circuit, filter circuit, rectifier, control system and noose machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110783905A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737360A (en) * | 2020-12-29 | 2021-04-30 | 上海骄成机电设备有限公司 | Rectifying circuit and power supply |
-
2019
- 2019-12-03 CN CN201911222901.4A patent/CN110783905A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737360A (en) * | 2020-12-29 | 2021-04-30 | 上海骄成机电设备有限公司 | Rectifying circuit and power supply |
| CN112737360B (en) * | 2020-12-29 | 2022-07-05 | 上海骄成超声波技术股份有限公司 | Rectifying circuit and power supply |
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