Switching control circuit for brake

Abstract

The invention provides a switching control circuit for a brake. The switching control circuit comprises a real-time control sub-circuit, a power-on 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 control right switching of the brake by the real-time control sub-circuit and the timing control sub-circuit through a voltage signal input by an acquisition end B; comprising the steps that when an acquisition end B is at a low level, a voltage signal of a real-time control sub-circuit is input through an acquisition end C to control a brake in real time, and when the acquisition end B is at a high level, the brake is controlled in a timing mode through a timing control sub-circuit. According to the invention, the problem that the application of an existing hardware circuit for on-off control of the brake is greatly limited due to the fact that the existing hardware circuit for on-off control of the brake is difficult to randomly switch between two on-off control modes is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit control, and in particular to a switching control circuit for a brake. Background Art

[0002] Regarding the on-off control of the brake, in some working states, the on-off control of the brake needs to be controlled in real time, while in some working states, the on-off control of the brake needs to be automatically controlled at a fixed time to realize the function of the product.

[0003] Existing hardware circuits for brake on-off control usually implement real-time control of the brake on-off alone, or implement timed on-off control of the brake alone. That is, a hardware circuit has only one working mode for controlling the on-off of the brake, and it is difficult to switch between the two on-off control modes at will, thereby limiting the application scope of the hardware circuit. Summary of the Invention

[0004] The purpose of the present invention is: The present invention provides a switching control circuit for a brake to solve the problem that the existing hardware circuit for on-off control of the brake is difficult to switch freely between two on-off control modes, which makes the application of the existing hardware circuit have great limitations.

[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 subcircuit, an electronic circuit, a timing control subcircuit, a priority switching subcircuit, and a diode D16 connected to a power supply of the brake; Among them, the power supply of the brake is connected to the positive terminal of the brake and the negative terminal of the diode D16 respectively, and the positive terminal of the diode D16 is connected to the negative terminal of the brake, as well as the diodes in the real-time control subcircuit and the electronic circuit; In the real-time control subcircuit, the input end is connected to the base b of the diode Q5 through the resistor R68, and its input end is used to input the voltage signal of the acquisition terminal C; the input ends of the electronic circuit and the priority switching subcircuit are both used to input the voltage signal of the acquisition terminal B; in the electronic circuit, the input end is connected to the base b of the diode Q6 after passing through the resistors R64 and R67, and the collectors c of the diodes Q5 and Q6 are respectively connected to the negative terminal of the brake and the positive electrode of the diode D16, and the emitters e are respectively grounded; in the priority switching subcircuit, the input end is connected to the base b of the diode Q10 after passing through the resistor R81, the collector c of the diode Q10 is connected to the base b of the diode Q5, and the emitter e is connected between the resistors R64 and R67; the output end of the timer U8 in the timing control subcircuit is connected to the resistor R64 and R67 in the electronic circuit after passing through the resistor R74 and the diode Q8; The switching control circuit is used to switch the control rights of the brake between the real-time control subcircuit and the timing control subcircuit through the voltage signal input from the acquisition terminal B. The switching control circuit includes: when the acquisition terminal B is at a low level, the voltage signal input from the real-time control subcircuit through the acquisition terminal C is used to control the brake in real time; when the acquisition terminal B is at a high level, the timing control subcircuit is used to control the brake in time.

[0006] Optionally, in the switching control circuit for the brake as described above, the switching control circuit implements switching of the control rights of the brake between the real-time control subcircuit and the timing control subcircuit, including: When the input of the acquisition terminal B is at a low level, the transistor Q10 is cut off, and the transistor Q5 in the real-time control subcircuit is controlled by the input voltage signal of the acquisition terminal C to be turned on or off in real time, thereby controlling the brake to be energized or de-energized in real time under the control of the input voltage signal of the acquisition terminal C; When the input of the acquisition terminal B is at a high level, the transistor Q10 is turned on, pulling down the base b voltage of the transistor Q5 in the real-time control sub-circuit, so that the transistor Q5 is turned off, thereby cutting off the control of the brake by the real-time control sub-circuit; at the same time, based on the control logic of the timer U8, its default output is low, so that its terminal transistor Q8 is turned off, and the electronic circuit is based on the high level input of the acquisition terminal B, turning on the transistor Q6 to energize the brake, and the brake is controlled on and off at a fixed time through the timing control sub-circuit.

[0007] Optionally, in the switching control circuit for the brake as described above, the timing control subcircuit performs timing on-off control on the brake in the following manner: Based on the timing logic of timer U8, its trigger terminal defaults to 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 end of the timer U8 to be pulled low and then inputting a high level, the timer U8 outputs a high level under the triggering of the rising edge signal, so that the transistor Q8 is turned on and the transistor Q6 is turned off, thereby cutting off the power to the brake.

[0008] Optionally, in the switching control circuit for the brake as described above, the timing control subcircuit includes: a timer U8, filter capacitors C37, C40 and C50, a resistor R74, a transistor Q8, and a timing control unit, the timing control unit including a resistor R65 and a capacitor C51; Among them, the input terminal A is respectively connected to the trigger terminal of the timer U8 and one end of the filter capacitor C49, the control voltage terminal (ControlVolt) of the timer U8 is connected to one end of the filter capacitor C50, the external power supply voltage is respectively connected to the power supply terminal VCC of the timer U8 and one end of the filter capacitor C37, and the ground terminal of the timer U8, and the other ends of the filter capacitors C37, C40 and C50 are respectively grounded; the power supply terminal VCC of the timer U8 is grounded after passing through the resistor R65 and the capacitor C51, and the discharge terminal (Discharge) and high trigger terminal (Threshold) of the timer U8 are respectively connected between the resistor R65 and the capacitor C51; the output terminal of the timer U8 is connected to the base b of the transistor Q8 through the resistor R74, the collector c of the transistor Q8 is connected between the resistor R64 and the resistor R67 in the electronic circuit, and the emitter e is grounded; The timing control subcircuit is used to control the voltage signal input from the input terminal A to the trigger terminal of the timer U8 when the acquisition terminal B inputs a high level, so that the transistor Q8 is turned on, thereby turning off the transistor Q6, and then the brake is de-energized and braked; The timing control subcircuit is further configured to output a low level after the timing of the timer U8 is reached, thereby controlling the transistor Q8 to be turned off, thereby turning on the transistor Q6 and energizing the brake to release the brake.

[0009] Optionally, in the switching control circuit for a brake as described above, the timing control subcircuit further comprises: a logic input unit; The logic input unit is used to form a timing start trigger signal of the timer U8 based on the voltage signal input from the input terminal A of the timing control subcircuit, thereby controlling the timing control subcircuit to start the braking action on the brake.

[0010] Optionally, in the switching control circuit for the brake as described above, the logic input unit includes: a resistor R75, a resistor R76 and a capacitor C44; The external power supply is connected to one end of the resistor R75 and the resistor R76 respectively, the other ends of the resistor R75 and the resistor R76 are connected to the two ends of the capacitor C44 respectively, the other end of the resistor R75 is also connected to the input terminal A, and the other end of the resistor R76 is specifically connected to the trigger terminal of the timer U8; The logic input unit is used to generate a rising edge signal based on the low level input after the high level input at the input terminal A is pulled low, and use the rising edge signal as the timing start trigger signal of the timer U8.

[0011] Optionally, in the switching control circuit for the brake as described above, the operating logic of the timing control subcircuit is: When a high level is input at the acquisition terminal B, the transistor Q10 is turned off, and the control of the brake is switched to the timing control sub-circuit, the brake is in the power-on state based on the conduction of the transistor Q6; the input terminal A outputs a high level by default, so that the controller is in the power-on state; when the timed braking starts, a low level is output through the input terminal A, and the logic input unit generates a short rising edge signal based on the input low level. The rising edge signal triggers the timer U8 to output a high level, so that the transistor Q8 is turned on and the transistor Q6 is turned off, thereby causing the brake to lose power and brake.

[0012] Optionally, in the switching control circuit for the brake as described above, in the timing control subcircuit, the timing time of the timer U8 is determined by the resistor R65 and the capacitor C51, and the design scheme of the timing time is: The timing time is: ; Wherein, 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 the high trigger terminal of timer U8 when it is charged to 2 / 3 of the power supply voltage.

[0013] Optionally, in the switching control circuit for the brake as described above, in the 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, and is used to reset the timer U8 of the timing control subcircuit when the acquisition terminal B switches the control of the controller to the real-time control subcircuit by inputting a low level, so that the timer U8 is forced to output a low level and stop working.

[0014] The beneficial effects of the present invention are as follows: the present invention provides a switching control circuit for a brake. On the one hand, different voltage states are inputted through the acquisition terminal B and the acquisition terminal C, and the real-time control and timing control switching of the brake are realized by automatically judging the input voltage signals of the acquisition terminal B and the acquisition terminal C; on the other hand, through two parallel transistors Q5 and Q6, the real-time control of the brake is realized by the transistor Q5 in the real-time control subcircuit, and the power-on in the brake timing control form is realized by the transistor Q6 in the electronic circuit. In the timing control form of the brake, the power-off braking control of the brake is realized by the triggering and output logic of the timer U8; on the other hand, through the design of the transistor Q10 in the priority switching subcircuit, the real-time control logic is disabled when the brake needs to be controlled timingly, thereby ensuring that for a brake with two working modes, the corresponding control form can be realized according to their respective control logics, the logic is clear, and in the overall control and switching process, it is only necessary to judge the voltage states of the acquisition points B and C, without the need for redundant operations, and it can adapt to a variety of application scenarios. The switching control circuit for a brake provided by the present invention has the following beneficial effects: First, by automatically judging the voltage status of the two acquisition terminals, the automatic switching function between the brake real-time control mode and the timing control mode is realized. The two control modes are interlocked, and in the timing control mode, the brake timing control time can be set as needed; Second, the switching control circuit for the brake provided by the present invention has a simple product structure, high reliability, a small number of components, low cost, and accurate timing; in addition, since the control logic of the brake can be judged by automatically monitoring the voltage status of the acquisition end, it has high practicality, is easy to promote and apply, and has great practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0016] Figure 1 A schematic diagram of the circuit structure of a switching control circuit for a brake provided in Example 1 of the present invention; Figure 2 A schematic diagram of the circuit structure of a switching control circuit for a brake provided in Example 2 of the present invention; Figure 3 This is a schematic diagram of the circuit structure of a switching control circuit for a brake provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other in any manner.

[0018] As described in the above background technology, the existing hardware circuits for on-off control of the brake currently only realize real-time control of the on-off of the brake, or only realize timed on-off control of the brake. It is difficult to switch between the two on-off control modes at will, thereby limiting the application scope of the hardware circuit.

[0019] In view of the above problems, the present invention provides a switching control circuit for a brake, specifically a circuit that realizes automatic switching between brake timing control and real-time control according to the identification of working status.

[0020] The present invention provides the following specific embodiments that can be combined with each other. The same or similar concepts or processes may not be described in detail in some embodiments.

[0021] Example 1 Figure 1This is a schematic diagram of the circuit structure of a switching control circuit for a brake provided in Example 1 of the present invention. Figure 1 As shown, the main components of the switching control circuit for the brake provided by the embodiment of the present invention include: a real-time control subcircuit, a pass circuit, a timing control subcircuit, a priority switching subcircuit, and a diode D16 connected to the power supply of the brake.

[0022] like Figure 1 As shown, in the switching control circuit provided by the present invention, the power supply of the brake is respectively connected to the positive terminal of the brake and the negative electrode of the diode D16, and the positive electrode of the diode D16 is respectively connected to the negative terminal of the brake, as well as the diodes in the real-time control subcircuit and the electronic circuit; in this circuit, the diode D16 has a power-off continuous current function, which is used to protect the transistor Q5 in the real-time control subcircuit and the transistor Q6 in the electronic circuit.

[0023] In the real-time control subcircuit of the present invention, the input terminal is connected to the base b of diode Q5 via resistor R68, and its input terminal is used to input the voltage signal of acquisition terminal C. The input terminals of the electronic circuit and priority switching subcircuit of the present invention are both used to input the voltage signal of acquisition terminal B. Specifically, in the electronic circuit, the input terminal is connected to the base b of diode Q6 via resistors R64 and R67, and the collectors c of diodes Q5 and Q6 are connected to the negative terminal of the brake and the positive electrode of diode D16, respectively, and the emitters e are grounded. In the priority switching subcircuit, the input terminal is connected to the base b of diode Q10 via resistor R81, and the collector c of diode Q10 is connected to the base b of diode Q5, and the emitter e is connected between resistors R64 and R67. The output terminal of timer U8 in the timing control subcircuit is connected to the resistor R64 and R67 in the electronic circuit via resistor R74 and diode Q8.

[0024] Based on the circuit form of the switching control circuit for the brake provided by the present invention, the working principle of the switching control circuit is: the voltage signal input by the acquisition terminal B is used to realize the switching of the control rights of the brake between the real-time control subcircuit and the timing control subcircuit; including: when the acquisition terminal B is at a low level, the voltage signal input to the real-time control subcircuit through the acquisition terminal C is used to control the brake in real time; when the acquisition terminal B is at a high level, the timing control of the brake is performed through the timing control subcircuit.

[0025] In a specific implementation of the embodiment of the present invention, the specific implementation scheme of the switching control circuit to realize the switching of the control rights of the brake between the real-time control subcircuit and the timing control subcircuit includes: (1) Real-time control form: When the input of the acquisition terminal B is at a low level, the on and off of the brake is controlled in real time through the voltage signal input in real time by the acquisition terminal C.

[0026] In this control scheme, when the input of the acquisition terminal B is at a low level, the transistor Q10 is cut off, and the transistor Q5 in the real-time control subcircuit is controlled by the input voltage signal of the acquisition terminal C to be turned on or off in real time, thereby controlling the brake to be powered on or off in real time under the control of the input voltage signal of the acquisition terminal C.

[0027] (2) Control right switching method from real-time control mode to timing control mode: When the input of the acquisition terminal B changes from low level to high level, the transistor Q10 is turned on, which pulls down the base b voltage of the transistor Q5 in the real-time control sub-circuit, causing the transistor Q5 to be turned off, thereby cutting off the control of the real-time control sub-circuit over the brake; Based on the configuration of transistor Q10 in the priority switching subcircuit, transistor Q5 is cut off to cut off the control of the brake on and off by the input voltage signal of the acquisition terminal C. This can prevent transistor Q5 from being turned on due to the control of the input voltage of the acquisition terminal C. That is, the brake is not controlled by the input voltage of the acquisition terminal C, which is used to effectively realize the control of the brake by the timing control subcircuit in the subsequent control logic.

[0028] (3) Timing control method: While the high level input by the acquisition terminal B turns on the transistor Q10 and turns off the transistor Q5, the control logic of the timer U8 defaults to a low level output, turning off its terminal transistor Q8. In addition, due to the high level input by the electronic circuit based on the acquisition terminal B, the transistor Q6 is turned on to energize the brake. At this time, the brake is controlled by the timing on and off of the timing control sub-circuit.

[0029] In one implementation of this embodiment 1, the control logic of the brake being controlled by the timing on-off control sub-circuit may be: Based on the timing logic of timer U8, its trigger terminal defaults to 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 end of the timer U8 to be pulled low and then inputting a high level, the timer U8 outputs a high level under the triggering of the rising edge signal, so that the transistor Q8 is turned on and the transistor Q6 is turned off, thereby cutting off the power to the brake.

[0030] It should be noted that in the switching control circuit provided in the above-described embodiment of the present invention, resistors R68, R81, R64, and R67 all function as current-limiting resistors. Furthermore, the switching control circuit provided in this embodiment of the present invention, based on the design of transistor Q10 in the priority switching subcircuit, enables switching between real-time brake control and timing control modes, as well as interlocking. This achieves clear logic, a simple circuit structure, and strong practicality.

[0031] Example 2 Figure 2 A schematic diagram of the circuit structure of a switching control circuit for a brake provided in Example 2 of the present invention; see Figure 2 As shown, the basic circuit composition, circuit structure, and switching principle of the real-time control and timing control of the switching control circuit provided in this embodiment 2 are basically the same as those of the switching control circuit provided in the above embodiment 1.

[0032] More specifically, in the switching control circuit for the brake provided in Example 2, a specific implementation scheme of the timing control subcircuit is proposed. The timing control subcircuit in Example 2 includes: a timer U8, filter capacitors C37, C40 and C50, a resistor R74, a transistor Q8, and a timing control unit. The timing control unit includes a resistor R65 and a capacitor C51.

[0033] like Figure 2 In the switching control circuit shown, the input terminal A of the timing control subcircuit is respectively connected to the trigger terminal of the timer U8 and one end of the filter capacitor C49, the control voltage terminal (ControlVolt) of the timer U8 is connected to one end of the filter capacitor C50, the external power supply voltage is respectively connected to the power supply terminal VCC of the timer U8 and one end of the filter capacitor C37, and the ground terminal of the timer U8 and the other ends of the filter capacitors C37, C40 and C50 are respectively grounded; the power supply terminal VCC of the timer U8 is grounded after passing through the resistor R65 and the capacitor C51, and the discharge terminal (Discharge) and high trigger terminal (Threshold) of the timer U8 are respectively connected between the resistor R65 and the capacitor C51; the output terminal of the timer U8 is connected to the base b of the transistor Q8 through the resistor R74, the collector c of the transistor Q8 is connected between the resistor R64 and the resistor R67 in the electronic circuit, and the emitter e is grounded.

[0034] Based on the circuit structure of the timing control subcircuit, its working principle is as follows: When a high level is input to the acquisition terminal B, that is, the on-off control of the brake 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 turned on and is in a non-braking state.

[0035] Subsequently, the brake is timed and controlled by controlling the voltage signal input from input terminal A to the trigger terminal of timer U8, turning on transistor Q8 and thereby turning off transistor Q6, which in turn de-energizes the brake. It should be noted that when transistor Q8 is turned on, its collector (c) and emitter (e) are connected to ground, lowering the voltage at the base (b) of transistor Q6, turning off transistor Q6 and de-energizing the brake. Furthermore, because the input from acquisition terminal B is high at this time, transistor Q5 remains off, preventing it from being turned on by the voltage input from acquisition terminal C.

[0036] After the timing of the timer U8 is reached, it outputs a low level to control the transistor Q8 to be turned off, thereby turning on the transistor Q6, and then energizing the brake to release the brake.

[0037] Example 3 Figure 3 This is a circuit diagram of a switching control circuit for a brake provided in Example 3 of the present invention; see Figure 3 As shown, the basic circuit composition, circuit structure, and switching principle of the real-time control and timing control of the switching control circuit provided in this embodiment 3 are basically the same as those of the switching control circuit provided in the above embodiment 2.

[0038] In the switching control circuit for the brake provided in this embodiment 3, an implementation scheme for forming a trigger terminal voltage signal of the timer U8 is proposed. In a specific implementation, the timing control subcircuit provided in this embodiment 3 also includes: a logic input unit.

[0039] The logic function of the logic input unit is to form a timing start trigger signal of the timer U8 based on the voltage signal input from the input terminal A of the timing control subcircuit, thereby controlling the timing control subcircuit to start braking the brake.

[0040] In one implementation of Example 3, Figure 3 As shown, a specific implementation example of a logic input unit is provided. The logic input unit includes: a resistor R75, a resistor R76, and a capacitor C44. An external power supply is connected to one end of each resistor R75 and resistor R76, respectively. The other ends of each resistor R75 and resistor 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 specifically connected to the trigger terminal of timer U8.

[0041] The function of the logic input unit is: after the high level input at the input terminal A is pulled low, a short rising edge signal is generated based on the low level input, and the rising edge signal is used as the timing start trigger signal of the timer U8.

[0042] Based on the logic function of the logic input unit in this implementation, the working logic of the timing control subcircuit is specifically as follows: When a high level is input to the acquisition terminal B, the transistor Q10 is turned off, and the control right of the brake is switched to the timing control sub-circuit, the brake is in the energized state due to the conduction of the transistor Q6; since the input terminal A outputs a high level by default, at this time, since the timer U8 is not triggered and outputs a low level, the transistor Q8 is turned off, and the transistor Q6 is always in the on state, that is, the controller is in the energized state; Subsequently, when the timed braking starts, a low level is output through the input terminal A, and the logic input unit generates a short rising edge signal based on the input low level. The rising edge signal triggers the timer U8 to output a high level, turning on the transistor Q8 and turning off the transistor Q6, thereby de-energizing the brake. Based on the timing logic of timer U8, after the timing time of timer U8 (i.e. braking time) is reached, it outputs a low level to control transistor Q8 to be cut off, thereby turning on transistor Q6, and then energizing the brake to release the brake.

[0043] In one implementation of Example 3, Figure 3 As shown, in the timing control subcircuit, the timing time of the timer U8 is determined by the resistor R65 and the capacitor C51. The design scheme of the timing time is: Calculate the timing time (i.e. braking time) as: ; Wherein, 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 the high trigger terminal of timer U8 when it is charged to 2 / 3 of the power supply voltage.

[0044] The design process is as follows: Assuming the timing time t=7s, the selected resistor R=1.35M, the power supply voltage is 15V, and the voltage V=10V when charged to 2 / 3 of the power supply voltage, substitute it into the above formula and calculate the capacitance to be 4.719uf. Select a 4.7uf capacitor. In order to reduce the change of the delay time within the full temperature range, the capacitor uses a type of ceramic capacitor with stable temperature characteristics and small capacitance value deviation.

[0045] Furthermore, based on the above-mentioned embodiments of the present invention, 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, so as to reset the timer U8 of the timing control subcircuit when the acquisition terminal B switches the control of the controller to the real-time control subcircuit by inputting a low level, so that the timer U8 is forced to output a low level and stop working.

[0046] The switching control circuit for a brake provided by an embodiment of the present invention, on the one hand, realizes real-time control and timing control switching of the brake by automatically judging the input voltage signals of the acquisition terminals B and C through different voltage states input by the acquisition terminals B and C; on the other hand, through two parallel transistors Q5 and Q6, the real-time control of the brake is realized by the transistor Q5 in the real-time control subcircuit, and the power-on in the brake timing control form is realized by the transistor Q6 in the electronic circuit. In the timing control form of the brake, the power-off braking control of the brake is realized by the triggering and output logic of the timer U8; on the other hand, through the design of the transistor Q10 in the priority switching subcircuit, the real-time control logic is disabled when the brake needs to be controlled timingly, thereby ensuring that for a brake with two working modes, the corresponding control form can be realized according to their respective control logics, the logic is clear, and in the overall control and switching process, it is only necessary to judge the voltage states of the acquisition points B and C, without the need for redundant operations, and it can adapt to a variety of application scenarios. The switching control circuit for a brake provided by the present invention has the following beneficial effects: First, by automatically judging the voltage status of the two acquisition terminals, the automatic switching function between the brake real-time control mode and the timing control mode is realized. The two control modes are interlocked, and in the timing control mode, the brake timing control time can be set as needed; Second, the switching control circuit for the brake provided by the present invention has a simple product structure, high reliability, a small number of components, low cost, and accurate timing; in addition, since the control logic of the brake can be judged by automatically monitoring the voltage status of the acquisition end, it has high practicality, is easy to promote and apply, and has great practical value.

[0047] Although the embodiments disclosed herein are as described above, the contents are merely provided to facilitate understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art may make any modifications and variations in the form and details of the embodiments without departing from the spirit and scope of the present invention. However, the scope of patent protection of the present invention shall remain subject to the scope defined by the appended claims.

Claims

1. A switching control circuit for a brake, characterized in that: include: a real-time control subcircuit, a pass-through electronic circuit, a timing control subcircuit, a priority switching subcircuit, and a diode D16 connected to the power supply of the brake; Among them, the power supply of the brake is connected to the positive terminal of the brake and the negative terminal of the diode D16 respectively, and the positive terminal of the diode D16 is connected to the negative terminal of the brake, as well as the diodes in the real-time control subcircuit and the electronic circuit; In the real-time control subcircuit, the input end is connected to the base b of the diode Q5 through the resistor R68, and its input end is used to input the voltage signal of the acquisition terminal C; the input ends of the electronic circuit and the priority switching subcircuit are both used to input the voltage signal of the acquisition terminal B; in the electronic circuit, the input end is connected to the base b of the diode Q6 after passing through the resistors R64 and R67, and the collectors c of the diodes Q5 and Q6 are respectively connected to the negative terminal of the brake and the positive electrode of the diode D16, and the emitters e are respectively grounded; in the priority switching subcircuit, the input end is connected to the base b of the diode Q10 after passing through the resistor R81, the collector c of the diode Q10 is connected to the base b of the diode Q5, and the emitter e is connected between the resistors R64 and R67; the output end of the timer U8 in the timing control subcircuit is connected to the resistor R64 and R67 in the electronic circuit after passing through the resistor R74 and the diode Q8; The switching control circuit is used to switch the control rights of the brake between the real-time control subcircuit and the timing control subcircuit through the voltage signal input from the acquisition terminal B. The switching control circuit includes: when the acquisition terminal B is at a low level, the voltage signal input from the real-time control subcircuit through the acquisition terminal C is used to control the brake in real time; when the acquisition terminal B is at a high level, the timing control subcircuit is used to control the brake in time.

2. The switching control circuit for a brake according to claim 1, characterized in that: The switching control circuit realizes the switching of the control rights of the brake between the real-time control subcircuit and the timing control subcircuit, and includes: When the input of the acquisition terminal B is at a low level, the transistor Q10 is cut off, and the transistor Q5 in the real-time control subcircuit is controlled by the input voltage signal of the acquisition terminal C to be turned on or off in real time, thereby controlling the brake to be energized or de-energized in real time under the control of the input voltage signal of the acquisition terminal C; When the input of the acquisition terminal B is at a high level, the transistor Q10 is turned on, pulling down the base b voltage of the transistor Q5 in the real-time control sub-circuit, so that the transistor Q5 is turned off, thereby cutting off the control of the brake by the real-time control sub-circuit; at the same time, based on the control logic of the timer U8, its default output is low, so that its terminal transistor Q8 is turned off, and the electronic circuit is based on the high level input of the acquisition terminal B, turning on the transistor Q6 to energize the brake, and the brake is controlled on and off at a fixed time through the timing control sub-circuit.

3. The switching control circuit for a brake according to claim 2, characterized in that: The timing control subcircuit performs timing on-off control on the brake in the following manner: Based on the timing logic of timer U8, its trigger terminal defaults to 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 end of the timer U8 to be pulled low and then inputting a high level, the timer U8 outputs a high level under the triggering of the rising edge signal, so that the transistor Q8 is turned on and the transistor Q6 is turned off, thereby cutting off the power to the brake.

4. The switching control circuit for a brake according to claim 3, characterized in that: The timing control subcircuit includes: a timer U8, filter capacitors C37, C40 and C50, a resistor R74, a transistor Q8, and a timing control unit, which includes a resistor R65 and a capacitor C51; Among them, the input terminal A is respectively connected to the trigger terminal of the timer U8 and one end of the filter capacitor C49, the control voltage terminal of the timer U8 is connected to one end of the filter capacitor C50, the external power supply voltage is respectively connected to the power supply terminal VCC of the timer U8 and one end of the filter capacitor C37, and the ground terminal of the timer U8, and the other ends of the filter capacitors C37, C40 and C50 are respectively grounded; the power supply terminal VCC of the timer U8 is grounded after passing through the resistor R65 and the capacitor C51, and the discharge terminal and the high trigger terminal of the timer U8 are respectively connected between the resistor R65 and the capacitor C51; the output terminal of the timer U8 is connected to the base b of the transistor Q8 through the resistor R74, the collector c of the transistor Q8 is connected between the resistor R64 and the resistor R67 in the electronic circuit, and the emitter e is grounded; The timing control subcircuit is used to control the voltage signal input from the input terminal A to the trigger terminal of the timer U8 when the acquisition terminal B inputs a high level, so that the transistor Q8 is turned on, thereby turning off the transistor Q6, and then the brake is de-energized and braked; The timing control subcircuit is further configured to output a low level after the timing of the timer U8 is reached, thereby controlling the transistor Q8 to be turned off, thereby turning on the transistor Q6 and energizing the brake to release the brake.

5. The switching control circuit for a brake according to claim 4, characterized in that: The timing control subcircuit further includes: a logic input unit; The logic input unit is used to form a timing start trigger signal of the timer U8 based on the voltage signal input from the input terminal A of the timing control subcircuit, thereby controlling the timing control subcircuit to start the braking action on the brake.

6. The switching control circuit for a brake according to claim 5, characterized in that: The logic input unit includes: a resistor R75, a resistor R76 and a capacitor C44; The external power supply is connected to one end of the resistor R75 and the resistor R76 respectively, the other ends of the resistor R75 and the resistor R76 are connected to the two ends of the capacitor C44 respectively, the other end of the resistor R75 is also connected to the input terminal A, and the other end of the resistor R76 is specifically connected to the trigger terminal of the timer U8; The logic input unit is used to generate a rising edge signal based on the low level input after the high level input at the input terminal A is pulled low, and use the rising edge signal as the timing start trigger signal of the timer U8.

7. The switching control circuit for a brake according to claim 6, characterized in that: The working logic of the timing control subcircuit is: When a high level is input at the acquisition terminal B, the transistor Q10 is turned off, and the control of the brake is switched to the timing control sub-circuit, the brake is in the power-on state based on the conduction of the transistor Q6; the input terminal A outputs a high level by default, so that the controller is in the power-on state; when the timed braking starts, a low level is output through the input terminal A, and the logic input unit generates a short rising edge signal based on the input low level. The rising edge signal triggers the timer U8 to output a high level, so that the transistor Q8 is turned on and the transistor Q6 is turned off, thereby causing the brake to lose power and brake.

8. The switching control circuit for a brake according to any one of claims 4 to 7, characterized in that: In the timing control subcircuit, the timing of the timer U8 is determined by the resistor R65 and the capacitor C51. The design scheme of the timing is: The timing time is: ; Wherein, 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 the high trigger terminal of timer U8 when it is charged to 2 / 3 of the power supply voltage.

9. The switching control circuit for a brake according to any one of claims 1 to 7, characterized in that: In the 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, which is used to reset the timer U8 of the timing control subcircuit when the acquisition terminal B switches the control of the controller to the real-time control subcircuit by inputting a low level, so that the timer U8 is forced to output a low level and stop working.

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