A switching control circuit for a brake

Abstract

The application provides a switching control circuit for a brake, comprising a real-time control sub-circuit, a conduction sub-circuit, a timing control sub-circuit, a priority switching sub-circuit and a diode D16 connected with a power supply of the brake; the switching control circuit is used for realizing the switching of the control right of the brake by the real-time control sub-circuit and the timing control sub-circuit through the voltage signal inputted by a collection end B; the brake is controlled by the voltage signal of the real-time control sub-circuit inputted by a collection end C when the collection end B is low, and the brake is controlled by the timing control sub-circuit when the collection end B is high. The application solves the problem of the existing hardware circuit for the on-off control of the brake, and the application of the existing hardware circuit has great limitations due to the difficulty in switching between the two on-off control modes.

Description

Technical Field

[0001] This invention relates to the field of circuit control technology, and more particularly to a switching control circuit for a brake. Background Technology

[0002] For brake on / off control, in some working conditions, it is necessary to control the brake on / off in real time, while in other working conditions, it is necessary to automatically control the brake on / off at regular intervals to achieve the product's function.

[0003] Existing hardware circuits for brake on / off control typically implement real-time control of the brake's on / off state or timed on / off control of the brake. This means that each hardware circuit only has one operating mode for controlling the brake's on / off state, making it difficult to switch freely between the two control modes, thus limiting the application range of the hardware circuit. Summary of the Invention

[0004] The purpose of this invention is to provide a switching control circuit for a brake, thereby solving the problem that existing hardware circuits for brake on / off control are limited in application because they are difficult to switch freely between two on / off control modes.

[0005] The technical solution of the present invention is as follows: The present invention provides a switching control circuit for a brake, comprising: a real-time control sub-circuit, a pass-through circuit, a timing control sub-circuit, a priority switching sub-circuit, and a diode D16 connected to the power supply of the brake;

[0006] The power supply for the brake is connected to the positive terminal of the brake and the negative terminal of diode D16. The positive terminal of diode D16 is connected to the negative terminal of the brake, as well as to the diodes in the real-time control sub-circuit and the electronic circuit.

[0007] In the real-time control sub-circuit, the input terminal is connected to the base b of transistor Q5 via resistor R68, and its input terminal is used to input the voltage signal of acquisition terminal C; the input terminals of the pass-through circuit and the priority switching sub-circuit are both used to input the voltage signal of acquisition terminal B; in the pass-through circuit, the input terminal is connected to the base b of transistor Q6 via resistors R64 and R67, and the collector c of transistor Q5 and the collector c of transistor Q6 are combined and connected to the negative terminal of the brake and the positive terminal of diode D16 respectively, and the emitters e of transistors Q5 and Q6 are grounded respectively; in the priority switching sub-circuit, the input terminal is connected to the base b of transistor Q10 via resistor R81, the collector c of transistor Q10 is connected to the base b of transistor Q5, and the emitter e is connected between resistors R64 and R67; in the timing control sub-circuit, the output terminal of timer U8 is connected between resistors R64 and R67 in the pass-through circuit via resistor R74 and transistor Q8;

[0008] The switching control circuit is used to switch the control of the brake between the real-time control sub-circuit and the timing control sub-circuit through the voltage signal input at the acquisition terminal B; including: when the acquisition terminal B is at a low level, the brake is controlled in real time through the voltage signal of the real-time control sub-circuit input at the acquisition terminal C; when the acquisition terminal B is at a high level, the brake is controlled in a timing manner through the timing control sub-circuit.

[0009] Optionally, in the switching control circuit for the brake as described above, the switching control circuit realizes the switching of control rights of the brake between the real-time control subcircuit and the timing control subcircuit, including:

[0010] When the input at the acquisition terminal B is low, transistor Q10 is cut off. In the real-time control sub-circuit, transistor Q5 is turned on or off in real time under the control of the input voltage signal at the acquisition terminal C, thereby controlling the brake to be electrolytically braked or de-energized under the control of the input voltage signal at the acquisition terminal C.

[0011] When the input at acquisition terminal B is high, transistor Q10 is turned on, pulling the base voltage (b) of transistor Q5 in the real-time control sub-circuit low, causing transistor Q5 to turn off, thereby cutting off the control of the brake by the real-time control sub-circuit. At the same time, the control logic based on timer U8 defaults to outputting a low level, causing its terminal transistor Q8 to turn off. The electronic circuit, based on the high level input at acquisition terminal B, turns on transistor Q6 to power on the brake, and the timing control sub-circuit performs timed on / off control of the brake.

[0012] Optionally, in the switching control circuit for the brake described above, the timing control sub-circuit performs timing on / off control of the brake in the following manner:

[0013] Based on the timing logic of timer U8, its trigger terminal has a default input high level and output low level. Transistor Q8 is cut off, and transistor Q6 is turned on, so that the brake is energized and in a non-braking state.

[0014] By controlling the trigger terminal of timer U8 to be pulled low and a high level is input, timer U8 outputs a high level under the trigger of the rising edge signal, which turns on transistor Q8 and turns off transistor Q6, thereby causing the brake to be de-energized and braked.

[0015] Optionally, in the switching control circuit for the brake as described above, the timing control sub-circuit includes: timer U8, filter capacitors C37, C49 and C50, resistor R74, transistor Q8, and timing control unit, which includes resistor R65 and capacitor C51.

[0016] The input terminal A is connected to the trigger terminal of timer U8 and one end of filter capacitor C49. The control voltage terminal (ControlVolt) of timer U8 is connected to one end of filter capacitor C50. The external power supply voltage is connected to the power supply terminal VCC of timer U8 and one end of filter capacitor C37. The ground terminal of timer U8 and the other ends of filter capacitors C37, C49, and C50 are grounded. The power supply terminal VCC of timer U8 is grounded through resistor R65 and capacitor C51. The discharge terminal (Discharge) and high trigger terminal (Threshold) of timer U8 are both connected to the line between resistor R65 and capacitor C51. The output terminal of timer U8 is connected to the base b of transistor Q8 through resistor R74. The collector c of transistor Q8 is connected between resistor R64 and resistor R67 in the pass-through circuit. The emitter e is grounded.

[0017] The timing control sub-circuit is used to control the voltage signal input to the trigger terminal of timer U8 by the input terminal A when a high level is input at the acquisition terminal B, so that transistor Q8 is turned on, thereby turning off transistor Q6, and thus de-energizing the brake.

[0018] The timing control sub-circuit is also used to output a low level after the timing time of timer U8 is reached, to control transistor Q8 to be cut off, thereby turning on transistor Q6, and then energizing the brake to release the brake.

[0019] Optionally, in the switching control circuit for the brake as described above, the timing control sub-circuit further includes: a logic input unit;

[0020] The logic input unit is used to generate a timing start trigger signal for timer U8 based on the voltage signal input at input terminal A of the timing control sub-circuit, thereby controlling the timing control sub-circuit to start braking the brake.

[0021] Optionally, in the switching control circuit for the brake as described above, the logic input unit includes: resistor R75, resistor R76, and capacitor C44;

[0022] The external power supply is connected to one end of resistors R75 and R76 respectively. The other ends of resistors R75 and R76 are connected to the two ends of capacitor C44 respectively. The other end of resistor R75 is also connected to input terminal A. The other end of resistor R76 is specifically connected to the trigger terminal of timer U8.

[0023] The logic input unit is used to generate a rising edge signal based on the low level of the input after the high level of the input terminal A is pulled low, and to use the rising edge signal as the timing start trigger signal of the timer U8.

[0024] Optionally, in the switching control circuit for the brake described above, the operating logic of the timing control sub-circuit is as follows:

[0025] When a high level is input at acquisition terminal B, transistor Q10 conducts, switching the control of the brake to the timing control sub-circuit. Transistor Q6 conducts, energizing the brake. Input terminal A outputs a high level by default, energizing the controller. At the start of timing braking, input terminal A outputs a low level, and the logic input unit generates a brief rising edge signal based on this low level. This rising edge signal triggers timer U8 to output a high level, turning on transistor Q8 and turning off transistor Q6, thus de-energizing the brake.

[0026] Optionally, in the switching control circuit for the brake as described above, in the timing control sub-circuit, the timing period of timer U8 is determined by resistor R65 and capacitor C51, and the design scheme of the timing period is as follows:

[0027] The timer is: ;

[0028] Where R represents the resistance value of resistor R65, C represents the capacitance value of capacitor C51, E represents the power supply voltage, and V represents the voltage value of timer U8 when the high trigger terminal is charged to 2 / 3 of the power supply voltage.

[0029] Optionally, in the switching control circuit for the brake as described above, the input terminal of the electronic circuit for inputting the voltage signal of the acquisition terminal B is also connected to the reset terminal of the timer U8. This is used to reset the timer U8 of the timing control sub-circuit when the acquisition terminal B switches the control of the brake to the real-time control sub-circuit by inputting a low level, so that the timer U8 is forced to output a low level and stop working.

[0030] The beneficial effects of this invention are as follows: This invention provides a switching control circuit for a brake. On the one hand, by inputting different voltage states at acquisition terminals B and C, and by automatically judging the input voltage signals at acquisition terminals B and C, the real-time control and timed control switching of the brake are realized. On the other hand, through two parallel transistors Q5 and Q6, transistor Q5 in the real-time control sub-circuit realizes the real-time control of the brake, and transistor Q6 in the power-on circuit realizes the power-on in the timed control mode of the brake. In the timed control mode of the brake, the power-off braking control of the brake is realized through the triggering and output logic of timer U8. Furthermore, through the design of transistor Q10 in the priority switching sub-circuit, the real-time control logic is disabled when timed control of the brake is required, thereby ensuring that for brakes with two working modes, the corresponding control form can be realized according to their respective control logic. The logic is clear, and the overall control and switching process only requires judging the voltage state of acquisition points B and C, without any extra operations, and can be adapted to various application scenarios. The switching control circuit for a brake provided by this invention has the following beneficial effects:

[0031] First, by automatically judging the voltage status of the two acquisition terminals, the automatic switching function of the brake real-time control mode and timed control mode is realized. The two control modes are interlocked, and the duration of the brake timed control can be set as needed in the timed control mode.

[0032] Secondly, the switching control circuit for brakes provided by this invention has a simple structure, high reliability, few components, low cost, and accurate timing. In addition, since the control logic of the brake can be determined by automatically monitoring the voltage status of the acquisition terminal, it has high practicality, is easy to promote and apply, and has great practical value. Attached Figure Description

[0033] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0034] Figure 1 This is a schematic diagram of a switching control circuit for a brake provided in Embodiment 1 of the present invention;

[0035] Figure 2 This is a schematic diagram of a switching control circuit for a brake provided in Embodiment 2 of the present invention;

[0036] Figure 3 This is a schematic diagram of a switching control circuit for a brake provided in Embodiment 3 of the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0038] As explained in the background section, existing hardware circuits for brake on / off control are currently limited to either real-time or timed on / off control of the brake, making it difficult to switch freely between the two control modes, thus restricting the application scope of the hardware circuits.

[0039] To address the aforementioned problems, this invention provides a switching control circuit for a brake, specifically a circuit that automatically switches between timed control and real-time control of the brake based on the identified operating state.

[0040] The present invention provides the following specific embodiments, which can be combined with each other. For the same or similar concepts or processes, they may not be described again in some embodiments.

[0041] Example 1

[0042] Figure 1 This is a schematic diagram of a switching control circuit for a brake according to Embodiment 1 of the present invention. (Refer to...) Figure 1 As shown, the main components of the switching control circuit for the brake provided in this embodiment of the invention include: a real-time control sub-circuit, a pass-through circuit, a timing control sub-circuit, a priority switching sub-circuit, and a diode D16 connected to the power supply of the brake.

[0043] like Figure 1 As shown, in the switching control circuit provided by the present invention, the power supply of the brake is connected to the positive terminal of the brake and the negative terminal of diode D16, respectively. The positive terminal of diode D16 is connected to the negative terminal of the brake, as well as the diodes in the real-time control sub-circuit and the electronic circuit. In this circuit, diode D16 has a freewheeling function to protect transistor Q5 in the real-time control sub-circuit and transistor Q6 in the electronic circuit.

[0044] In the real-time control sub-circuit of this invention, the input terminal is connected to the base b of transistor Q5 via resistor R68, and its input terminal is used to input the voltage signal of the acquisition terminal C. The input terminals of both the pass-through circuit and the priority switching sub-circuit of this invention are used to input the voltage signal of the acquisition terminal B. Specifically, in the pass-through circuit, the input terminal is connected to the base b of transistor Q6 via resistors R64 and R67, and the collector c of transistor Q5 and the collector c of transistor Q6 are combined and connected to the negative terminal of the brake and the positive terminal of diode D16, respectively. The emitters e of transistors Q5 and Q6 are grounded, respectively. In the priority switching sub-circuit, the input terminal is connected to the base b of transistor Q10 via resistor R81, the collector c of transistor Q10 is connected to the base b of transistor Q5, and the emitter e is connected between resistors R64 and R67. In the timing control sub-circuit, the output terminal of timer U8 is connected between resistors R64 and R67 in the pass-through circuit via resistor R74 and transistor Q8.

[0045] Based on the circuit configuration of the switching control circuit for the brake provided by the present invention, the working principle of the switching control circuit is as follows: the control rights of the real-time control sub-circuit and the timing control sub-circuit are switched by the voltage signal input at the acquisition terminal B; including: when the acquisition terminal B is at a low level, the brake is controlled in real time by the voltage signal of the real-time control sub-circuit input at the acquisition terminal C; when the acquisition terminal B is at a high level, the brake is controlled in a timing manner by the timing control sub-circuit.

[0046] In specific implementations of this invention, the specific implementation scheme for switching the control rights of the brake between the real-time control sub-circuit and the timing control sub-circuit includes:

[0047] (1) Real-time control method:

[0048] When the input at acquisition terminal B is low, the on / off state of the brake is controlled in real time by the voltage signal input at acquisition terminal C.

[0049] In this control scheme, when the input at the acquisition terminal B is low, transistor Q10 is cut off. In the real-time control sub-circuit, transistor Q5 is turned on or off in real time under the control of the input voltage signal at the acquisition terminal C, thereby controlling the brake to be electrolytically braked or de-energized under the control of the input voltage signal at the acquisition terminal C.

[0050] (2) Control switching method from real-time control to timed control:

[0051] When the input at the acquisition terminal B changes from low level to high level, transistor Q10 turns on, pulling down the base voltage of transistor Q5 in the real-time control sub-circuit, causing transistor Q5 to turn off, thereby cutting off the control of the real-time control sub-circuit over the brake.

[0052] Based on the setting of transistor Q10 in the priority switching sub-circuit, the control of the brake's on / off state by cutting off the input voltage signal at the acquisition terminal C through transistor Q5 can prevent transistor Q5 from being turned on by the control of the input voltage at the acquisition terminal C, so that the brake is not controlled by the input voltage at the acquisition terminal C. This is used to effectively realize the control of the brake by the timing control sub-circuit in the subsequent control logic.

[0053] (3) Timed control method:

[0054] When the high level input at acquisition terminal B turns on transistor Q10 and turns off transistor Q5, the control logic based on timer U8 defaults to outputting a low level, causing its terminal transistor Q8 to turn off. Furthermore, since the electronic circuit turns on transistor Q6 based on the high level input at acquisition terminal B, the brake is energized. At this time, the brake is controlled by the timing control sub-circuit.

[0055] In one implementation of this embodiment 1, the control logic for the brake being controlled by the timing on / off control of the timing control sub-circuit can be:

[0056] Based on the timing logic of timer U8, its trigger terminal has a default input high level and output low level. Transistor Q8 is cut off, and transistor Q6 is turned on, so that the brake is energized and in a non-braking state.

[0057] By controlling the trigger terminal of timer U8 to be pulled low and a high level is input, timer U8 outputs a high level when triggered by the rising edge signal, which turns on transistor Q8 and turns off transistor Q6, thereby de-energizing and cutting off the brake.

[0058] It should be noted that in the switching control circuit provided in the above embodiments of the present invention, resistors R68, R81, R64, and R67 are all used as current-limiting resistors. Furthermore, by employing the switching control circuit provided in the embodiments of the present invention, based on the design of transistor Q10 in the priority switching sub-circuit, the switching between real-time control and timed control modes of the brake, as well as interlocking, can be achieved. The logic is clear, the circuit structure is simple, and it is highly practical.

[0059] Example 2

[0060] Figure 2 This is a schematic diagram of a switching control circuit for a brake provided in Embodiment 2 of the present invention; see also Figure 2 As shown, the basic circuit composition, circuit structure, and switching principle of the real-time control and timing control of the brake provided in this embodiment 2 are basically the same as those of the switching control circuit provided in embodiment 1 above.

[0061] More specifically, in the switching control circuit for the brake provided in Embodiment 2, a specific implementation scheme of the timing control sub-circuit is proposed. The timing control sub-circuit in Embodiment 2 includes: timer U8, filter capacitors C37, C49 and C50, resistor R74, transistor Q8, and timing control unit, which includes resistor R65 and capacitor C51.

[0062] like Figure 2 In the switching control circuit shown, the input terminal A of the timing control sub-circuit is connected to the trigger terminal of timer U8 and one end of filter capacitor C49, respectively. The control voltage terminal (ControlVolt) of timer U8 is connected to one end of filter capacitor C50. The external power supply voltage is connected to the power supply terminal VCC of timer U8 and one end of filter capacitor C37, respectively. The ground terminal of timer U8 and the other ends of filter capacitors C37, C49 and C50 are grounded, respectively. The power supply terminal VCC of timer U8 is grounded through resistor R65 and capacitor C51, and the discharge terminal (Discharge) and high trigger terminal (Threshold) of timer U8 are both connected between resistor R65 and capacitor C51. The output terminal of timer U8 is connected to the base b of transistor Q8 through resistor R74. The collector c of transistor Q8 is connected between resistor R64 and resistor R67 in the pass-through circuit, and the emitter e is grounded.

[0063] Based on the circuit structure of this timing control sub-circuit, its working principle is as follows:

[0064] When a high level is input at the acquisition terminal B, that is, when the control of the brake's on / off state has been switched to the timing control sub-circuit, the timer U8 outputs a low level in the default state, the transistor Q8 is cut off, and the transistor Q6 is turned on. At this time, the controller is in a non-braking state.

[0065] Subsequently, the timing control of the brake is implemented as follows: the voltage signal input to the trigger terminal of timer U8 via control input terminal A turns on transistor Q8, thereby turning off transistor Q6 and de-energizing the brake. It should be noted that because transistor Q8 is on, its collector (c) to emitter (e) is grounded, pulling down the base (b) voltage of transistor Q6, causing Q6 to turn off and thus de-energizing the brake. Additionally, since the input at acquisition terminal B is high at this time, transistor Q5 remains in the off state to prevent it from being controlled by the input voltage at acquisition terminal C.

[0066] When the timer U8 reaches its set time, it outputs a low level, which controls transistor Q8 to turn off, thereby turning on transistor Q6 and energizing the brake to release it.

[0067] Example 3

[0068] Figure 3 This is a schematic diagram of a switching control circuit for a brake provided in Embodiment 3 of the present invention; see also Figure 3 As shown, the basic circuit composition, circuit structure, and switching principle of the real-time control and timing control of the brake provided in this embodiment 3 are basically the same as those of the switching control circuit provided in the above embodiment 2.

[0069] In the switching control circuit for the brake provided in Embodiment 3, an implementation scheme for forming the trigger terminal voltage signal of timer U8 is proposed. In specific implementation, the timing control sub-circuit provided in Embodiment 3 also includes a logic input unit.

[0070] The logical function of this logic input unit is: based on the voltage signal input at input terminal A of the timing control sub-circuit, a timing start trigger signal for timer U8 is generated, thereby controlling the timing control sub-circuit to start braking the brake.

[0071] In one implementation of embodiment 3, such as Figure 3 As shown, a specific implementation example of a logic input unit is provided, which includes: resistor R75, resistor R76, and capacitor C44. An external power supply is connected to one end of resistor R75 and resistor R76 respectively, and the other ends of resistor R75 and resistor R76 are connected to both ends of capacitor C44 respectively. The other end of resistor R75 is also connected to input terminal A, and the other end of resistor R76 is specifically connected to the trigger terminal of timer U8.

[0072] The function of this logic input unit is: after the high level of input A is pulled low, a brief rising edge signal is generated based on the low level of the input, and this rising edge signal is used as the timing start trigger signal of timer U8.

[0073] Based on the logic function of the logic input unit in this implementation, the working logic of the timing control sub-circuit is as follows:

[0074] When a high level is input at acquisition terminal B, transistor Q10 conducts, switching the control of the brake to the timing control sub-circuit. The conduction of transistor Q6 keeps the brake in a powered state. Since input terminal A outputs a high level by default, timer U8 is not triggered and outputs a low level, transistor Q8 is cut off, and transistor Q6 is always in a conducting state, thus keeping the controller powered.

[0075] Subsequently, when the timed braking begins, a low level is output through input terminal A, and a brief rising edge signal is generated by the logic input unit based on the low level of the input. This rising edge signal triggers timer U8 to output a high level, which turns on transistor Q8 and turns off transistor Q6, thereby causing the brake to de-energize and brake.

[0076] Based on the timing logic of timer U8, after the timing time of timer U8 (i.e. braking time) is reached, a low level is output to control transistor Q8 to turn off, thereby turning on transistor Q6, and then energizing the brake to release the brake.

[0077] In one implementation of embodiment 3, such as Figure 3 As shown, in the timing control sub-circuit, the timing period of timer U8 is determined by resistor R65 and capacitor C51. The design scheme for the timing period is as follows:

[0078] The timing period (i.e., braking time) is calculated as follows: ;

[0079] Where R represents the resistance value of resistor R65, C represents the capacitance value of capacitor C51, E represents the power supply voltage, and V represents the voltage value of timer U8 when the high trigger terminal is charged to 2 / 3 of the power supply voltage.

[0080] The design process is as follows: Assuming the timing time t=7s, the selected resistor R=1.35MΩ, the power supply voltage is 15V, and the voltage V=10V when charged to 2 / 3 of the power supply voltage, substituting into the above formula, the calculated capacitance is 4.719uf. A 4.7uf capacitor is selected. In order to reduce the variation of the delay time over the entire temperature range, a ceramic capacitor with stable temperature characteristics and small capacitance value deviation is selected.

[0081] Furthermore, based on the above embodiments of the present invention, the input terminal of the electronic circuit used to input the voltage signal of the acquisition terminal B is also connected to the reset terminal of the timer U8. This is used to reset the timer U8 of the timing control sub-circuit when the acquisition terminal B switches the control of the brake to the real-time control sub-circuit by inputting a low level, so that the timer U8 is forced to output a low level and stop working.

[0082] The switching control circuit for a brake provided in this invention, on the one hand, achieves real-time control and timed control switching of the brake by automatically judging the input voltage signals of acquisition terminals B and C, based on different voltage states input at acquisition terminals B and C. On the other hand, through two parallel transistors Q5 and Q6, transistor Q5 in the real-time control sub-circuit implements real-time control of the brake, while transistor Q6 in the power-on circuit implements power-on in the timed control mode of the brake. In the timed control mode of the brake, the power-off braking control of the brake is achieved through the triggering and output logic of timer U8. Furthermore, through the design of transistor Q10 in the priority switching sub-circuit, the real-time control logic is disabled when timed control of the brake is required. This ensures that for brakes with two operating modes, the corresponding control form can be implemented according to their respective control logics. The logic is clear, and the overall control and switching process only requires judging the voltage states of acquisition points B and C, without any extra operations, making it adaptable to various application scenarios. The switching control circuit for a brake provided by this invention has the following beneficial effects:

[0083] First, by automatically judging the voltage status of the two acquisition terminals, the automatic switching function of the brake real-time control mode and timed control mode is realized. The two control modes are interlocked, and the duration of the brake timed control can be set as needed in the timed control mode.

[0084] Secondly, the switching control circuit for brakes provided by this invention has a simple structure, high reliability, few components, low cost, and accurate timing. In addition, since the control logic of the brake can be determined by automatically monitoring the voltage status of the acquisition terminal, it has high practicality, is easy to promote and apply, and has great practical value.

[0085] While the embodiments disclosed in this invention are as described above, they are merely illustrative of the embodiments to facilitate understanding of the invention and are not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A switching control circuit for a brake, characterized in that, include: Real-time control sub-circuit, electronic circuit, timing control sub-circuit, priority switching sub-circuit, and diode D16 connected to the power supply of the brake; The power supply for the brake is connected to the positive terminal of the brake and the negative terminal of diode D16, and the positive terminal of diode D16 is connected to the negative terminal of the brake, as well as the diodes in the real-time control sub-circuit and the electronic circuit. In the real-time control sub-circuit, the input terminal is connected to the base b of transistor Q5 via resistor R68, and its input terminal is used to input the voltage signal of acquisition terminal C; the input terminals of the pass-through circuit and the priority switching sub-circuit are both used to input the voltage signal of acquisition terminal B; in the pass-through circuit, the input terminal is connected to the base b of transistor Q6 via resistors R64 and R67, and the collector c of transistor Q5 and the collector c of transistor Q6 are combined and connected to the negative terminal of the brake and the positive terminal of diode D16 respectively, and the emitters e of transistors Q5 and Q6 are grounded respectively; in the priority switching sub-circuit, the input terminal is connected to the base b of transistor Q10 via resistor R81, the collector c of transistor Q10 is connected to the base b of transistor Q5, and the emitter e is connected between resistors R64 and R67; in the timing control sub-circuit, the output terminal of timer U8 is connected between resistors R64 and R67 in the pass-through circuit via resistor R74 and transistor Q8; The switching control circuit is used to switch the control of the brake between the real-time control sub-circuit and the timing control sub-circuit through the voltage signal input at the acquisition terminal B; including: when the acquisition terminal B is at a low level, the brake is controlled in real time through the voltage signal of the real-time control sub-circuit input at the acquisition terminal C; when the acquisition terminal B is at a high level, the brake is controlled in a timing manner through the timing control sub-circuit. The switching control circuit realizes the switching of control of the brake between the real-time control sub-circuit and the timed control sub-circuit, including: When the input at the acquisition terminal B is low, transistor Q10 is cut off. In the real-time control sub-circuit, transistor Q5 is turned on or off in real time under the control of the input voltage signal at the acquisition terminal C, thereby controlling the brake to be electrolytically braked or de-energized under the control of the input voltage signal at the acquisition terminal C. When the input at acquisition terminal B is high, transistor Q10 is turned on, pulling the base voltage of transistor Q5 in the real-time control sub-circuit low, causing transistor Q5 to turn off, thereby cutting off the control of the brake by the real-time control sub-circuit. At the same time, the control logic based on timer U8 defaults to outputting a low level, causing its terminal transistor Q8 to turn off, and the electronic circuit, based on the high level input at acquisition terminal B, turns on transistor Q6 to power on the brake, and the timing control sub-circuit performs timed on / off control of the brake. The timing control subcircuit controls the brake's on / off state in the following manner: Based on the timing logic of timer U8, its trigger terminal has a default input high level and output low level. Transistor Q8 is cut off, and transistor Q6 is turned on, so that the brake is energized and in a non-braking state. By controlling the trigger terminal of timer U8 to be pulled low and a high level is input, timer U8 outputs a high level under the trigger of the rising edge signal, which turns on transistor Q8 and turns off transistor Q6, thereby causing the brake to be de-energized and braked.

2. The switching control circuit for a brake according to claim 1, characterized in that, The timing control sub-circuit includes: timer U8, filter capacitors C37, C49 and C50, resistor R74, transistor Q8 and timing control unit, the timing control unit includes resistor R65 and capacitor C51; The input terminal A is connected to the trigger terminal of timer U8 and one end of filter capacitor C49. The control voltage terminal of timer U8 is connected to one end of filter capacitor C50. The external power supply voltage is connected to the power supply terminal VCC of timer U8 and one end of filter capacitor C37. The ground terminal of timer U8 and the other ends of filter capacitors C37, C49, and C50 are grounded. The power supply terminal VCC of timer U8 is grounded through resistor R65 and capacitor C51. The discharge terminal and high trigger terminal of timer U8 are both connected to the line between resistor R65 and capacitor C51. The output terminal of timer U8 is connected to the base b of transistor Q8 through resistor R74. The collector c of transistor Q8 is connected between resistor R64 and resistor R67 in the pass-through circuit. The emitter e is grounded. The timing control sub-circuit is used to control the voltage signal input to the trigger terminal of timer U8 by the input terminal A when a high level is input at the acquisition terminal B, so that transistor Q8 is turned on, thereby turning off transistor Q6, and thus de-energizing the brake. The timing control sub-circuit is also used to output a low level after the timing time of timer U8 is reached, to control transistor Q8 to be cut off, thereby turning on transistor Q6, and then energizing the brake to release the brake.

3. The switching control circuit for a brake according to claim 2, characterized in that, The timing control sub-circuit also includes: a logic input unit; The logic input unit is used to generate a timing start trigger signal for timer U8 based on the voltage signal input at input terminal A of the timing control sub-circuit, thereby controlling the timing control sub-circuit to start braking the brake.

4. The switching control circuit for a brake according to claim 3, characterized in that, The logic input unit includes: resistor R75, resistor R76 and capacitor C44; The external power supply is connected to one end of resistors R75 and R76 respectively. The other ends of resistors R75 and R76 are connected to the two ends of capacitor C44 respectively. The other end of resistor R75 is also connected to input terminal A, and the other end of resistor R76 is connected to the trigger terminal of timer U8. The logic input unit is used to generate a rising edge signal based on the low level of the input after the high level of the input terminal A is pulled low, and to use the rising edge signal as the timing start trigger signal of the timer U8.

5. The switching control circuit for a brake according to claim 4, characterized in that, The operating logic of the timing control sub-circuit is as follows: When a high level is input at acquisition terminal B, transistor Q10 conducts, switching the control of the brake to the timing control sub-circuit. Transistor Q6 conducts, energizing the brake. Input terminal A outputs a high level by default, energizing the controller. At the start of timing braking, input terminal A outputs a low level, and the logic input unit generates a brief rising edge signal based on this low level. This rising edge signal triggers timer U8 to output a high level, turning on transistor Q8 and turning off transistor Q6, thus de-energizing the brake.

6. The switching control circuit for a brake according to any one of claims 2 to 5, characterized in that, In the timing control sub-circuit, the timing period of timer U8 is determined by resistor R65 and capacitor C51. The design scheme for the timing period is as follows: The timer is: ; Where R represents the resistance value of resistor R65, C represents the capacitance value of capacitor C51, E represents the power supply voltage, and V represents the voltage value of timer U8 when the high trigger terminal is charged to 2 / 3 of the power supply voltage.

7. The switching control circuit for a brake according to any one of claims 1 to 6, characterized in that, In the aforementioned electronic circuit, the input terminal for inputting the voltage signal of the acquisition terminal B is also connected to the reset terminal of the timer U8. This is used to reset the timer U8 of the timing control sub-circuit when the acquisition terminal B switches the control of the brake to the real-time control sub-circuit by inputting a low level, so that the timer U8 is forced to output a low level and stop working.

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