Direct current step-down circuit, band-type brake mechanism and motor

Abstract

The invention provides a direct current step-down circuit, a band-type brake mechanism and a motor, and belongs to the technical field of band-type brake mechanisms. The DC step-down circuit comprises an input circuit, an energy storage inductor and an output circuit, wherein the input circuit, the energy storage inductor and the output circuit are electrically connected in sequence; the input circuit is used for being connected with a power supply; the energy storage inductor is used for controlling opening and closing of the brake shoe brake through a magnetic field; and the output circuit is used for accessing a load. By adopting the scheme, the energy storage inductor in the direct-current step-down circuit can replace a band-type brake coil connected to the load end of the direct-current step-down circuit in the related technology, namely, the band-type brake coil does not need to be arranged in the band-type brake mechanism, so that the cost of the band-type brake mechanism is reduced, and the working stability is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of brake mechanisms, and in particular to a direct current step-down circuit, a brake mechanism and a motor. Background Art

[0002] The brake mechanism is the brake of the servo motor, and is also called a holding brake. When the brake mechanism is in the brake state, the motor in a stationary and power-off state can be locked in position to prevent the motor from moving due to external forces. When the brake mechanism is in the release state, the motor in the power-on state can work normally.

[0003] The brake mechanism is generally provided with a voltage-adjustable DC step-down circuit and a brake shoe brake, wherein the load end of the DC step-down circuit is connected to a brake coil, and the brake shoe brake generally includes a brake wheel and a brake shoe. When the brake coil is energized, a magnetic field is generated, under the action of the magnetic field, the brake wheel and the brake shoe are separated, at this time, the brake mechanism is in a released state; when the brake coil is not energized, no magnetic field is generated around the brake coil, the brake wheel and the brake shoe are held together, at this time, the brake mechanism is in a brake state.

[0004] However, in the related art, the number of electronic components in the brake mechanism is relatively large, which makes the brake mechanism costly. Summary of the invention

[0005] The embodiments of the present disclosure provide a DC step-down circuit, a brake mechanism and a motor, which can solve the problem of high cost of the brake mechanism due to the large number of electronic components in the brake mechanism in the related art. The technical solution is as follows:

[0006] The present disclosure provides a direct current step-down circuit, the direct current step-down circuit comprising an input circuit, an energy storage inductor and an output circuit, wherein the input circuit, the energy storage inductor and the output circuit are electrically connected in sequence;

[0007] The input circuit is used to access the power supply;

[0008] The energy storage inductor is used to control the opening and closing of the brake shoe brake through a magnetic field;

[0009] The output circuit is used for connecting to a load.

[0010] In a possible implementation, the energy storage inductor and the brake shoe brake belong to the same brake mechanism.

[0011] In a possible implementation, the input circuit and the output circuit are located on the same circuit board, the circuit board is spatially isolated from the brake mechanism, and two ends of the energy storage inductor are electrically connected to the input circuit and the output circuit respectively through wires.

[0012] In a possible implementation, the input circuit includes a first switch circuit and a freewheeling circuit;

[0013] The first connection end of the first switch circuit is electrically connected to the power supply;

[0014] The second connection end of the first switch circuit, the first connection end of the energy storage inductor and the output end of the freewheeling circuit are electrically connected;

[0015] The input end of the freewheeling circuit is electrically connected to the power supply and the output circuit respectively.

[0016] In a possible implementation, the output circuit includes a filter capacitor;

[0017] The first connection end of the filter capacitor is electrically connected to the second connection end of the energy storage inductor and the load respectively, and the second connection end of the filter capacitor is electrically connected to the input circuit and the load respectively.

[0018] In a possible implementation manner, the output circuit further includes a second switch circuit;

[0019] The first connection end of the second switch circuit is electrically connected to the first connection end of the filter capacitor, and the second connection end of the second switch circuit is electrically connected to the second connection end of the filter capacitor.

[0020] In a possible implementation manner, the load includes an auxiliary power supply.

[0021] In a possible implementation, the DC step-down circuit further includes a third switch circuit and a unidirectional current cutoff circuit;

[0022] The first connection end of the third switch circuit is electrically connected to the power supply;

[0023] The input end of the unidirectional current cutoff circuit is electrically connected to the first output end of the output circuit;

[0024] The second connection end of the third switch circuit, the output end of the unidirectional current cutoff circuit and the first end of the auxiliary power supply are electrically connected;

[0025] The second end of the auxiliary power supply is electrically connected to the second output end of the output circuit.

[0026] In a second aspect, a brake mechanism is provided, the brake mechanism comprising a DC step-down circuit and a brake shoe brake as described in any one of the first aspect and possible implementations thereof.

[0027] In a possible implementation, the armature of the brake mechanism is located within the magnetic field range generated by the energy storage inductor of the DC step-down circuit.

[0028] In a possible implementation, the brake mechanism further includes an iron core, and the iron core is wound by the energy storage inductor.

[0029] In a third aspect, a motor is provided, the motor comprising a brake mechanism as described in any one of the second aspect and possible implementations thereof.

[0030] The technical solution provided by the embodiments of the present disclosure has the following beneficial effects:

[0031] In the solution provided by the embodiment of the present disclosure, the DC step-down circuit includes an energy storage inductor, and the energy storage inductor controls the opening and closing of the brake shoe brake through a magnetic field, thereby realizing the switching of the brake mechanism between the release state and the brake state. With this solution, the energy storage inductor in the DC step-down circuit can replace the brake coil connected to the load end of the DC step-down circuit in the related art, that is, there is no need to set up a brake coil in the brake mechanism, and the energy storage inductor directly acts on the brake shoe brake. Due to the characteristics of the energy storage inductor itself, there is no need to set up an additional sampling circuit in the DC step-down circuit. Therefore, compared with the brake mechanism in the related art, the brake mechanism using this DC step-down circuit can save at least one brake coil, which is beneficial to reducing the cost of the brake mechanism and improving working stability.

[0032] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 is a structural schematic diagram of a brake mechanism provided by an embodiment of the present disclosure;

[0035] Figure 2 is a structural schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure;

[0036] Figure 3 is a structural schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure;

[0037] Figure 4 is a structural schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure;

[0038] Figure 5 is a structural schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure;

[0039] Figure 6 is a structural schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure;

[0040] Figure 7 is a structural schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure;

[0041] Figure 8 It is a structural schematic diagram of a DC step-down circuit provided in an embodiment of the present disclosure.

[0042] Legend

[0043] 1. Input circuit; 2. Energy storage inductor; 3. Output circuit; 4. Third switch circuit; 5. One-way current cutoff circuit;

[0044] 11. first switch circuit; 12. freewheeling circuit; 31. filter capacitor; 32. second switch circuit;

[0045] 01. DC step-down circuit; 02. Brake shoe brake. DETAILED DESCRIPTION

[0046] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0047] The brake mechanism is the brake of the servo motor, and is also called a holding brake. When the brake mechanism is in the brake state, the motor in a stationary and power-off state can be locked in position to prevent the motor from moving due to external forces. When the brake mechanism is in the release state, the motor in the power-on state can work normally.

[0048] In the related art, the brake mechanism is generally provided with a voltage-adjustable DC step-down circuit, an electromagnetic controller and a brake shoe brake, wherein the DC step-down circuit usually adopts a buck step-down circuit, the electromagnetic controller usually includes a brake coil, an iron core and an armature, and the brake shoe brake usually includes a brake wheel and a brake shoe. The mechanical structure of the brake mechanism is the prior art and will not be described here. In other structural divisions of the related art, the above-mentioned DC step-down circuit does not belong to the brake mechanism, that is, the brake mechanism includes an electromagnetic controller and a brake shoe brake. In this case, the DC step-down circuit is spatially isolated from the brake mechanism.

[0049] The brake coil of the electromagnetic controller is electrically connected to the load end of the buck step-down circuit (i.e., the DC step-down circuit). When the brake coil is energized, a magnetic field is generated. Under the action of the magnetic field, the iron core is magnetized and the armature is attracted, thereby separating the brake wheel and brake shoe that were originally held together. At this time, the brake mechanism is in a released state; when the brake coil is not energized, no magnetic field is generated around the brake coil, the iron core is not magnetized, and the armature is not attracted, thereby the brake wheel and brake shoe are held together. At this time, the brake mechanism is in a held state.

[0050] The process of releasing the brake usually includes two stages: starting the release and maintaining the release. In the starting release stage, the current of the brake coil is usually large, and in the maintaining release stage, the brake coil does not need a large current. In the related art, the output voltage of the buck buck circuit, that is, the voltage across the brake coil, is usually adjusted by adjusting the switch tube in the buck buck circuit, thereby adjusting the current on the brake coil. In order to ensure the stability of the output voltage of the buck buck circuit, a sampling circuit or a feedback circuit is usually set in the buck buck circuit.

[0051] In the related art, the number of electronic components in the brake mechanism is large, which makes the brake mechanism costly, and the more electronic components there are, the worse the stability of the circuit is. Therefore, the present disclosure provides a DC step-down circuit that can solve the problem of high cost of the brake mechanism due to the large number of electronic components in the brake mechanism in the related art. In order to make the purpose, technical solution and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below in conjunction with the accompanying drawings.

[0052] Figure 1 is a schematic diagram of a brake mechanism provided by an embodiment of the present disclosure. As an example, Figure 1 As shown, the brake mechanism includes a DC step-down circuit 01 and a brake shoe brake 02, wherein the brake shoe brake 02 is a prior art and will not be described in detail here. Figure 1 As shown, the DC step-down circuit 01 includes an input circuit 1, an energy storage inductor 2 and an output circuit 3, and the input circuit 1, the energy storage inductor 2 and the output circuit 3 are electrically connected in sequence.

[0053] The input circuit 1 is used to connect the power supply; the energy storage inductor 2 is used to control the opening and closing of the brake shoe brake through the magnetic field; the output circuit 3 is used to connect the load. As an example, when the power supply supplies power to the energy storage inductor 2 through the input circuit 1, that is, current flows inside the energy storage inductor 2, at this time, the energy storage inductor 2 generates a magnetic field, which can separate the brake wheel and brake shoe of the brake shoe brake, so that the brake mechanism enters the release state. When the power supply does not supply power to the energy storage inductor 2, the energy storage inductor 2 will not generate a magnetic field. At this time, the brake wheel and brake shoe of the brake shoe brake are engaged, so that the brake mechanism enters the brake state. The output circuit 3 and the load are used to maintain the current in the energy storage inductor 2.

[0054] As an example, the brake mechanism also includes an armature, which is located within the magnetic field generated by the energy storage inductor 2. There is a certain mechanical connection between the armature and the brake shoe brake 02. The connection structure between the armature and the brake shoe brake 02 is not described here.

[0055] As an example, the DC buck circuit 01 may also include a control chip, which is at least electrically connected to the input circuit 1, and is used to control the on / off state of the input circuit 1, thereby controlling the power supply to transmit voltage to the energy storage inductor 2. For the connection method between the control chip and the input circuit 1, the connection method between the control chip and the switch circuit or switch tube in the buck circuit of the related technology can be adopted, so the control chip is not described in detail here. It should be noted that the control chip can be a part of the DC buck circuit 01, or a part independent of the DC buck circuit 01, or a control program with other control chips as carriers. There is no limitation on the structural form of the control chip.

[0056] In the solution provided by the embodiment of the present disclosure, the DC step-down circuit includes an energy storage inductor 2, and the energy storage inductor 2 controls the opening and closing of the brake shoe brake through a magnetic field, thereby realizing the switching of the brake mechanism between the release state and the brake state. With this solution, the energy storage inductor 2 in the DC step-down circuit can replace the brake coil connected to the load end of the DC step-down circuit in the related art, that is, there is no need to set up a brake coil in the brake mechanism, and the energy storage inductor 2 directly acts on the brake shoe brake. Due to the characteristics of the energy storage inductor 2 itself, there is no need to set up an additional sampling circuit in the DC step-down circuit. Therefore, compared with the brake mechanism in the related art, the brake mechanism using this DC step-down circuit can save at least one brake coil, which is beneficial to reducing the cost of the brake mechanism and improving the working stability.

[0057] In some examples, the overall structure of the component can be divided as follows: the energy storage inductor 2 and the brake shoe brake in the DC step-down circuit belong to the same braking mechanism, while the input circuit 1 and the output circuit 2 in the DC step-down circuit do not belong to the braking mechanism. In other words, the energy storage inductor 2 in the DC step-down circuit replaces the braking coil of the electromagnetic controller in the related technology.

[0058] As an example, when the energy storage inductor 2 and the brake shoe brake belong to the same brake mechanism, the input circuit 1 and the output circuit 3 of the DC step-down circuit are usually located on the same circuit board, and the circuit board is spatially isolated from the above-mentioned brake mechanism, that is, there is a certain distance between the circuit board and the brake mechanism or the energy storage inductor 2. The two ends of the energy storage inductor 2 are electrically connected to the circuit board through wires, thereby realizing electrical connection with the input circuit 1 and the output circuit 3.

[0059] As an example, a first terminal and a second terminal are provided on the circuit board, the first terminal is electrically connected to the input circuit 1, the second terminal is electrically connected to the output circuit 3, and the two ends of the energy storage inductor 2 are electrically connected to the first terminal and the second terminal through wires, respectively, so as to achieve circuit connectivity. With this solution, when the brake mechanism is applied to different products, the positional relationship between the brake mechanism and the circuit board can be flexibly set, and even if they are set far away, the circuit board can be electrically connected to the energy storage inductor 2 through wires to form a complete circuit, thus helping to improve the flexibility of the overall design.

[0060] Figure 2 is a schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure. Figure 2 As shown, in the DC step-down circuit, the input circuit 1 includes a first switch circuit 11 and a freewheeling circuit 12. The first connection terminal 11a of the first switch circuit 11 is electrically connected to the power supply; the second connection terminal 11b of the first switch circuit 11, the first connection terminal 2a of the energy storage inductor 2 and the output terminal 12b of the freewheeling circuit 12 are electrically connected; the input terminal 12a of the freewheeling circuit 12 is electrically connected to the power supply and the output circuit 3 respectively, wherein the first switch circuit 11 is generally composed of at least one switch tube. The first switch circuit 11 also has a control terminal ( Figure 2 The control end is electrically connected to the control chip of the DC step-down circuit, and the control chip can control the on-off state of the first switch circuit 11, thereby supplying power or not supplying power to the energy storage inductor.

[0061] Figure 3 is a schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure. As an example, Figure 3As shown, the first switch circuit 11 includes a switch tube, and the number of the switch tube is one, one connection end of the switch tube is electrically connected to the power supply as the first connection end 11a of the first switch circuit 11, the other connection end of the switch tube is electrically connected to the freewheeling circuit 12 and the energy storage inductor 2 as the second connection end 11b of the first switch circuit 11, and the control end of the switch tube is electrically connected to the control chip, and the control chip can control the current flowing through the energy storage inductor 2 by adjusting the duty cycle of the switch tube. The adoption of this solution, using a switch tube as the first switch circuit 11, is conducive to simplifying the circuit structure, reducing the number of electronic devices in the circuit, thereby helping to save production costs, and the switch tube is simple to control, which is conducive to improving the working efficiency of the circuit.

[0062] The freewheeling circuit 12 may include a switch tube or a diode. Figure 3 The connection mode when the freewheeling circuit 12 adopts a diode is shown in FIG. 1 , which will not be described in detail here. When a switch tube is used, one connection end of the switch tube serves as the first connection end 12a of the freewheeling circuit 12, and the other connection end of the switch tube serves as the second connection end 12b of the freewheeling circuit 2. The control end of the switch tube can be electrically connected to the control chip. At this time, the control chip can control the first switch circuit 11 and the freewheeling circuit 12, thereby ensuring that the entire DC step-down circuit can work normally.

[0063] The structural composition of the first switch circuit 11 and the freewheeling circuit 12 is merely described here for exemplary purposes, and no limitation is imposed thereon.

[0064] Figure 4 is a schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure. Figure 4 As shown, in the DC step-down circuit, the output circuit 3 includes a filter capacitor 31, which can not only play a filtering role, but also play a voltage stabilizing role, which is beneficial to improve the stability of the DC step-down circuit. Usually, when selecting the filter capacitor 31, it is necessary to consider the time required for the above-mentioned start-up release phase in the brake mechanism. For example, if the start-up release phase is 200 milliseconds, when selecting the filter capacitor 31, it is necessary to select a capacitor that takes 200 milliseconds to be fully charged, and so on.

[0065] As an example, Figure 4 As shown, the first connection end 31a of the filter capacitor 31 is electrically connected to the second connection end 2b of the energy storage inductor 2 and the load respectively, and the second connection end 31b of the filter capacitor 31 is electrically connected to the input circuit 1 and the load respectively.

[0066] Optionally, the filter capacitor 31 may be a plurality of capacitors connected in series, and the charging time of the plurality of capacitors connected in series needs to meet the time required for the above-mentioned start-up release phase.

[0067] Figure 5 is a structural schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure, Figure 6 is a schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure. Figure 5 and Figure 6 As shown, the output circuit 3 may also include a second switch circuit 32, and the second switch circuit 32 is connected in parallel with the above-mentioned filter capacitor 31, wherein the second switch circuit 32 generally includes a switch tube. Specifically, the first connection end 32a of the second switch circuit 32 is electrically connected to the first connection end 31a of the filter capacitor 31, and the second connection end 32b of the second switch circuit 32 is electrically connected to the second connection end 31b of the filter capacitor 31. During the above-mentioned start-up release stage, the second switch circuit 32 is in a connected state, at which time the filter capacitor 31 is short-circuited, and a large current can continue to flow through the energy storage inductor 2; during the above-mentioned maintenance release stage, the second switch circuit 32 is in a disconnected state, at which time the filter capacitor 31 is in a charging state, and the filter capacitor 31 can play a role in filtering and voltage stabilization.

[0068] As an example, Figure 6 As shown, the second switch circuit 32 is a switch tube, one connection end of the switch tube serves as the first connection end 32a of the second switch circuit 32, and the other connection end of the switch tube serves as the second connection end 32b of the second switch circuit 32. The control end of the switch tube can be electrically connected to the above-mentioned control chip. When the brake mechanism is in the above-mentioned start-up release stage, the control chip can control the switch tube to be in a connected state. At this time, the filter capacitor 31 is short-circuited, and a large current can continue to flow through the energy storage inductor 2; when the brake mechanism changes from the start-up release stage to the maintenance release stage, the control chip can control the switch tube to be in an open circuit state. At this time, the filter capacitor 31 is in a working state, that is, the filter capacitor 31 is in a charging state. Adopting this solution, using a switch tube as the second switch circuit 32 is conducive to simplifying the circuit structure, reducing the number of electronic devices in the circuit, thereby saving production costs, and the switch tube is simple to control, which is conducive to improving the working efficiency of the circuit.

[0069] With this solution, a second switch circuit 32 is provided in the DC step-down circuit. When the brake mechanism is in the start-up release stage, the second switch circuit 32 is connected to allow a larger current to flow through the energy storage inductor 2, so as to generate a stronger magnetic field and cause the brake mechanism to enter a release state. Moreover, the second switch circuit 32 has a smaller energy loss, which is beneficial to reducing energy consumption.

[0070] The structural composition of the output circuit 3 and the second switch circuit 32 is merely described here for exemplary purposes, and no limitation is imposed thereon.

[0071] Figure 7is a structural schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure, Figure 8 is a schematic diagram of a DC step-down circuit provided by an embodiment of the present disclosure. Figure 7 and Figure 8 As shown, the load in the DC step-down circuit includes an auxiliary power supply. Usually, an auxiliary power supply is provided in a brake mechanism or a product using a brake mechanism, and the auxiliary power supply is used to drive the brake mechanism or a chip and other components in the product using the brake mechanism. Usually, the auxiliary power supply needs to be electrically connected to a DC power supply to store electrical energy. In this solution, the load includes an auxiliary power supply. When the DC step-down circuit is used, the auxiliary power supply can be directly charged, which can simplify the circuit structure and reduce energy consumption.

[0072] As an example, Figure 7 As shown, when the load includes an auxiliary power supply, the DC step-down circuit further includes a third switch circuit 4 and a unidirectional current cutoff circuit 5. The first connection terminal 4a of the third switch circuit 4 is electrically connected to the power supply; the input terminal 5a of the unidirectional current cutoff circuit 5 is electrically connected to the first output terminal 3a of the output circuit 3; the second connection terminal 4b of the third switch circuit 4, the output terminal 5b of the unidirectional current cutoff circuit 5 and the first terminal of the auxiliary power supply are electrically connected; the second terminal of the auxiliary power supply is electrically connected to the second output terminal 3b of the output circuit 3. Among them, the third switch circuit 4 can generally include a switch tube.

[0073] When the auxiliary power supply needs to be charged or in the above-mentioned startup release stage, the third switch circuit 4 is in a connected state, and the power supply supplies power to the auxiliary power supply through the fourth step-down circuit 4; in the above-mentioned maintenance release stage, the fourth switch circuit 4 is in a disconnected state, and the unidirectional current cutoff circuit 5 is in a connected state, and the power supply supplies power to the auxiliary power supply through the input circuit 1, the energy storage inductor 2, the output circuit 3 and the unidirectional current cutoff circuit 5.

[0074] As an example, Figure 8 As shown, the third switch circuit 4 includes a switch tube, and the unidirectional current cutoff circuit 5 includes a diode. One connection end of the switch tube serves as the first connection end 4a of the third switch circuit 4, and the other connection end of the switch tube serves as the second connection end 4b of the third switch circuit 4, and the control end of the switch tube can be electrically connected to the above-mentioned control chip. When the brake mechanism is in the above-mentioned start-up release stage, the control chip can control the switch tube to be in a connected state, at which time, the power supply charges the auxiliary power supply through the switch tube; when the brake mechanism changes from the start-up release stage to the maintenance release stage, the control chip can control the switch tube to be in an open circuit state, at which time, the unidirectional current cutoff circuit 5 is in a connected state, thereby supplying power to the auxiliary power supply.

[0075] Optionally, the unidirectional current cutoff circuit 5 may also include a switching tube, in which case one connection end of the switching tube serves as the first connection end 5a of the unidirectional current cutoff circuit 5, and the other connection end of the switching tube serves as the second connection end 5b of the unidirectional current cutoff circuit 5. The control end of the switching tube may be electrically connected to the above-mentioned control chip, and the control chip controls the current direction of the switching tube to supply power to the auxiliary power supply.

[0076] In this solution, when a switch tube is used as the third switch circuit 4 and the unidirectional current cutoff circuit 5 respectively, it is beneficial to simplify the circuit structure and reduce the number of electronic components in the circuit, thereby saving production costs. In addition, the switch tube is simple to control, which is beneficial to improving the working efficiency of the circuit.

[0077] Optionally, the load may include only a resistor, or may include an auxiliary power supply and a resistor in parallel, etc. The specific composition of the load, the structural composition of the third switch circuit 4, and the structural composition of the unidirectional current cutoff circuit 5 are only illustrative and are not limited in any way.

[0078] Based on the same technical concept, the embodiment of the present disclosure also provides a brake mechanism, as an example, Figure 1 As shown, the brake mechanism includes any one of the DC step-down circuits 01 and brake shoe brake 02 provided in the embodiments of the present disclosure. With this solution, the energy storage inductor 2 in the DC step-down circuit can replace the brake coil connected to the load end of the DC step-down circuit in the related art, that is, there is no need to set up a brake coil in the brake mechanism, and the energy storage inductor 2 directly acts on the brake shoe brake. Due to the characteristics of the energy storage inductor 2 itself, there is no need to set up an additional sampling circuit in the DC step-down circuit. Therefore, compared with the brake mechanism in the related art, the brake mechanism using this DC step-down circuit can save at least one brake coil, which is beneficial to reducing the cost of the brake mechanism and improving the working stability.

[0079] In some examples, the armature of the brake mechanism is located within the magnetic field generated by the energy storage inductor 2 of the DC step-down circuit 01. When current flows through the energy storage inductor 2, a magnetic field can be generated, which can attract the armature of the brake mechanism, thereby separating the brake wheel and brake shoe in the engaged state to achieve brake release.

[0080] In some examples, the brake mechanism further includes an iron core, which is wound by the energy storage inductor 2. When the energy storage inductor 2 is energized, a magnetic field is generated. Under the action of the magnetic field, the iron core is magnetized to attract the armature, thereby separating the brake wheel and brake shoe that were originally held together. At this time, the brake mechanism is in a brake release state; when the energy storage inductor 2 is not energized, no magnetic field is generated around the energy storage inductor 2, the iron core is not magnetized, and the armature is not attracted, so that the brake wheel and brake shoe are held together. At this time, the brake mechanism is in a brake state. With this solution, the iron core is magnetized under the action of the magnetic field generated by the energy storage inductor 2, which is conducive to enhancing the attraction ability of the armature, thereby facilitating the time required to start the brake release and improving work efficiency.

[0081] Based on the same technical concept, the embodiment of the present disclosure also provides a motor, which includes any brake mechanism provided by the embodiment of the present disclosure. The motor can be used in, but is not limited to, scenes such as elevators, access control, and AGV (Automated Guided Vehicle). With this solution, the energy storage inductor 2 in the DC step-down circuit can replace the brake coil connected to the load end of the DC step-down circuit in the related art, that is, there is no need to set a brake coil in the brake mechanism, and the energy storage inductor 2 directly acts on the brake shoe brake. Due to the characteristics of the energy storage inductor 2 itself, there is no need to set an additional sampling circuit in the DC step-down circuit. Therefore, the brake mechanism using the DC step-down circuit can save at least one brake coil compared to the brake mechanism in the related art, which is beneficial to reducing the cost of the brake mechanism and the motor, and is beneficial to improving working stability.

[0082] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A DC step-down circuit, characterized in that: The DC step-down circuit comprises an input circuit (1), an energy storage inductor (2) and an output circuit (3), wherein the input circuit (1), the energy storage inductor (2) and the output circuit (3) are electrically connected in sequence; The input circuit (1) is used to connect to a power source; The energy storage inductor (2) is used to control the opening and closing of the brake shoe brake through a magnetic field; The output circuit (3) is used for connecting to a load.

2. The DC step-down circuit according to claim 1, characterized in that: The energy storage inductor (2) and the brake shoe brake belong to the same brake mechanism.

3. The DC step-down circuit according to claim 2, characterized in that: The input circuit (1) and the output circuit (3) are located on the same circuit board, the circuit board is spatially isolated from the brake mechanism, and the two ends of the energy storage inductor (2) are electrically connected to the input circuit (1) and the output circuit (3) respectively through wires.

4. The DC step-down circuit according to any one of claims 1 to 3, characterized in that: The input circuit (1) comprises a first switch circuit (11) and a freewheeling circuit (12); The first connection end (11a) of the first switch circuit (11) is electrically connected to the power supply; The second connection end (11b) of the first switch circuit (11), the first connection end (2a) of the energy storage inductor (2), and the output end (12b) of the freewheeling circuit (12) are electrically connected; The input end (12a) of the freewheeling circuit (12) is electrically connected to the power supply and the output circuit (3) respectively.

5. The DC step-down circuit according to any one of claims 1 to 3, characterized in that: The output circuit (3) comprises a filter capacitor (31); The first connection end (31a) of the filter capacitor (31) is electrically connected to the second connection end (2b) of the energy storage inductor (2) and the load, respectively, and the second connection end (31b) of the filter capacitor (31) is electrically connected to the input circuit (1) and the load, respectively.

6. The DC step-down circuit according to claim 5, characterized in that: The output circuit (3) further includes a second switch circuit (32); The first connection end (32a) of the second switch circuit (32) is electrically connected to the first connection end (31a) of the filter capacitor (31), and the second connection end (32b) of the second switch circuit (32) is electrically connected to the second connection end (31b) of the filter capacitor (31).

7. The DC step-down circuit according to any one of claims 1 to 3, characterized in that: The load includes an auxiliary power supply.

8. The DC step-down circuit according to claim 7, characterized in that: The DC step-down circuit also includes a third switch circuit (4) and a unidirectional current cutoff circuit (5); The first connection end (4a) of the third switch circuit (4) is electrically connected to the power supply; The input end (5a) of the unidirectional current cutoff circuit (5) is electrically connected to the first output end (3a) of the output circuit (3); The second connection end (4b) of the third switch circuit (4), the output end (5b) of the unidirectional current cutoff circuit (5) and the first end of the auxiliary power supply are electrically connected; The second end of the auxiliary power supply is electrically connected to the second output end (3b) of the output circuit (3).

9. A brake mechanism, characterized in that: The holding brake mechanism comprises a DC step-down circuit (01) and a brake shoe brake (02) as claimed in any one of claims 1 to 8.

10. The brake mechanism according to claim 9, characterized in that: The armature of the brake mechanism is located within the magnetic field range generated by the energy storage inductor (2) of the DC step-down circuit (01).

11. The brake mechanism according to claim 9 or 10, characterized in that: The holding brake mechanism also includes an iron core, and the iron core is wound around the energy storage inductor (2).

12. A motor, characterized in that: The motor comprises a brake mechanism as described in any one of claims 9 to 11.

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