CN216598963U - Brake overload protection circuit and system - Google Patents
Brake overload protection circuit and system Download PDFInfo
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- CN216598963U CN216598963U CN202123267256.3U CN202123267256U CN216598963U CN 216598963 U CN216598963 U CN 216598963U CN 202123267256 U CN202123267256 U CN 202123267256U CN 216598963 U CN216598963 U CN 216598963U
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Abstract
The utility model discloses a braking overload protection circuit and system, its circuit includes: the charging and discharging module is used for charging and discharging when the input braking signal is at a high level; the control module is used for carrying out logic operation according to the braking signal and transmitting an instruction corresponding to a logic operation result to the braking module so as to control the working state of the braking module; and the braking module is used for receiving the instruction of the control module and executing corresponding braking action. The utility model discloses carry out the protection of brake pipe, prevent that brake resistance heating from damaging, even the peripheral equipment is burnt out on fire.
Description
Technical Field
The utility model relates to an overload protection technical field further relates to braking overload protection circuit and system.
Background
At present, all electrohydraulic servo drivers have a brake protection function, when the bus voltage of the driver exceeds a set value (a protection value), a brake pipe is opened, energy is released through an external brake resistor, the bus voltage is reduced to a safety range, the servo driver is protected, and the damage to internal circuits and elements of the driver caused by overhigh bus voltage is avoided. Effective braking solutions are widely used on electro-hydraulic servo drives.
The braking scheme of a conventional electro-hydraulic servo driver is shown in fig. 1:
when the power is on, the initial state of the brake signal V0 is high level, and the brake pipe Q1 is not conducted and does not brake. When the bus voltage exceeds the set value of the servo driver, the CPU controls a brake signal V0 to be changed into low level, a third pin 3 and a fourth pin 4 of the optical coupler U7 are conducted, the fourth pin 4 of the optical coupler U7 outputs high level, the current is limited through R11 and then drives the brake pipe Q1 to be conducted, at the moment, the bus current flows through the brake pipe Q1 from a bus voltage positive pole DC (+) through a brake resistor R13 to reach a bus voltage negative pole DC (-), the electric energy is quickly consumed when passing through the brake resistor R13, the bus voltage is reduced to a normal range, and therefore the braking effect is achieved. Where R12 is a bias resistor.
The circuit cannot limit the conduction time of the brake pipe Q1, when the brake time is too long or the control circuit breaks down to cause that a brake signal is low level for a long time, the brake pipe Q1 can be conducted for a long time, the temperature of the brake resistor R13 can be rapidly increased, and the brake resistor can bulge and deform and burn to be burnt till the fire happens, so that the circuit is very dangerous.
The braking scheme of the traditional electro-hydraulic servo driver is characterized in that a braking signal is controlled by software to drive a braking pipe to be opened, so that braking is carried out, and braking protection is completed. When the braking signal is low level for a long time due to overlong system braking time or a fault of a control circuit, a brake pipe is conducted for a long time, so that the brake resistor is damaged by heat generation, even if a fire occurs, peripheral equipment is burnt.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model aims to solve the braking time process and lead to the braking circuit to generate heat and damage, the technical problem that burns peripheral equipment even fires.
In order to achieve the above object, the present invention provides a brake overload protection circuit, including:
in some embodiments, a brake overload protection circuit includes:
the charging and discharging module is used for charging and discharging when the input braking signal is at a high level;
the control module is used for carrying out logic operation according to the braking signal and transmitting an instruction corresponding to a logic operation result to the braking module so as to control the working state of the braking module;
and the braking module is used for receiving the instruction of the control module and executing corresponding braking action.
In some embodiments, the charge and discharge module includes:
the first voltage division unit is used for dividing the brake signal;
the driving switch unit is used for driving the charging and discharging unit to discharge or charge when the braking signal is at a high level and a low level;
and a charge and discharge unit for performing charge and discharge.
In some embodiments, the first pressure dividing unit comprises: a first voltage dividing resistor and a second voltage dividing resistor;
the driving switch unit comprises a first NOT gate, a first driving resistor and an N-type driving triode;
the charge and discharge unit includes: a charge and discharge capacitor, a bias resistor and a charge and discharge resistor;
the input end of the first not gate is connected with the brake signal, the output end of the first not gate is connected with the base electrode of the N-type driving triode after being connected with the first driving resistor, and the emitting electrode of the N-type driving triode is connected with the base electrode of the N-type driving triode through the biasing resistor and then grounded;
a collector of the N-type driving triode is connected with a first end of the charge and discharge resistor, and a second end of the charge and discharge resistor is respectively connected with a first end of the charge and discharge capacitor, a second end of the first divider resistor and a first end of the second divider resistor;
the second end of the second voltage-dividing resistor is connected with the second end of the charge-discharge capacitor and then grounded;
and the first end of the first voltage-dividing resistor is respectively connected with the input end of the first NOT gate and the control module.
In some embodiments, the control module comprises:
the second voltage division unit is used for dividing the brake signal again;
the first comparison unit is used for accessing the brake signal after voltage division and the brake signal after voltage division again and outputting a first comparison result;
and the first logic operation unit is used for carrying out logic operation on the first comparison result and outputting a first logic operation result.
In some embodiments, the second voltage division unit includes: a third voltage dividing resistor and a fourth voltage dividing resistor;
the first comparison unit includes: a first comparator;
the first logical operation unit includes: a first AND gate and a second NOT gate;
a positive phase input end of the first comparator is connected with first ends of the third voltage dividing resistor and the fourth voltage dividing resistor respectively, a second end of the third voltage dividing resistor is connected with the first voltage dividing resistor, and a second end of the fourth voltage dividing resistor is grounded;
the negative phase input end of the first comparator is respectively connected with the first ends of the charge and discharge resistor, the charge and discharge capacitor and the second divider resistor;
the output end of the first comparator is connected with the second input end of the first AND gate, the first input end of the first AND gate is connected with the braking signal, and the output end of the first AND gate is connected with the grating of the braking module.
In some embodiments, the control module further comprises:
the second comparison unit is used for accessing the brake signal after voltage division and the brake signal after voltage division again and outputting a second comparison result;
the second logic operation unit is used for carrying out logic operation on the second comparison result and outputting a second logic operation result;
and the brake overload protection unit is used for triggering overload alarm according to the second logic operation result.
In some embodiments, the second comparing unit comprises: a second comparator;
the second logical operation unit includes: a second AND gate;
the brake overload protection unit includes: a main control chip;
the positive phase input end of the second comparator is connected with the negative phase input end of the first comparator, and the negative phase input end of the second comparator is connected with the positive phase input end of the first comparator;
the output end of the second comparator is connected with the first input end of the second AND gate, the second input end of the second AND gate is connected with the braking signal, and the output end of the second AND gate is connected with the alarm control pin of the main control chip to trigger overload alarm.
According to the utility model discloses an on the other hand, the utility model discloses a chip is further provided, and the integration has foretell braking overload protection circuit.
Compared with the prior art, the utility model provides a braking overload protection circuit and system adopts hardware resistance, electric capacity to fill, the principle of discharging carries out brake control, break down when system braking time overlength or control circuit, when leading to brake signal to be the high level for a long time, when condenser charging voltage value is higher than the circuit design requirement value, force and carry out the brake pipe protection, can trigger braking alarm pulse signal simultaneously and send CPU to, warn for system operation personnel, thereby play the effect of protection brake circuit and brake resistance.
Drawings
The above features, technical features, advantages and modes of realisation of the present invention will be further described in the following detailed description of preferred embodiments thereof, which is to be read in conjunction with the accompanying drawings.
FIG. 1 is a circuit schematic of a braking scheme of a conventional electro-hydraulic servo drive;
fig. 2 is a schematic structural diagram of the brake overload protection circuit of the present invention;
fig. 3 is a schematic circuit diagram of the brake overload protection circuit of the present invention;
fig. 4 is a timing diagram of the brake start of the brake overload protection circuit of the present invention;
fig. 5 is a timing diagram of the brake overload protection circuit according to the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In addition, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
In order to more clearly illustrate embodiments of the present invention or technical solutions in the prior art, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from these drawings without inventive effort.
Referring to the specification and to fig. 2, a brake overload protection circuit, in particular, includes:
the charging and discharging module is used for charging and discharging when the input braking signal V0 is at a high level;
the control module is used for carrying out logical operation according to the braking signal V0 and transmitting an instruction corresponding to a logical operation result to the braking module so as to control the working state of the braking module;
and the braking module is used for receiving the instruction of the control module and executing corresponding braking action.
In the traditional scheme, a brake signal V0 is controlled by software to drive a brake pipe to be opened for braking, so that braking protection is completed. The utility model discloses when system braking time overlength or control circuit break down and lead to brake signal V0 to be the low level for a long time, through the operating condition of the mode adjustment braking module of charge-discharge, force and brake the protection to play the effect of protection braking circuit (braking module promptly).
In some embodiments, the charge and discharge module includes:
the first voltage division unit is used for dividing the brake signal V0;
the driving switch unit is used for driving the charging and discharging unit to discharge or charge when the brake signal V0 is at a high level and a low level;
and a charge and discharge unit for performing charge and discharge.
In some embodiments, the first pressure dividing unit comprises: a first divider resistor R3, a second divider resistor R4;
the driving switch unit comprises a first NOT gate U3, a first driving resistor R6 and an N-type driving triode T1;
the charge and discharge unit includes: a charging and discharging capacitor C1, a bias resistor R7 and a charging and discharging resistor R5;
the input end of the first not gate U3 is connected to the braking signal V0, the output end of the first not gate U3 is connected to the base of the N-type driving transistor T1 after being connected to the first driving resistor R6, and the emitter of the N-type driving transistor T1 is connected to the base of the N-type driving transistor T1 through the biasing resistor R7 and then grounded;
a collector of the N-type driving transistor T1 is connected to a first end of the charge and discharge resistor R5, and a second end of the charge and discharge resistor R5 is connected to a first end of the charge and discharge capacitor C1, a second end of the first voltage dividing resistor R3, and a first end of the second voltage dividing resistor R4, respectively;
a second end of the second voltage-dividing resistor R4 is connected to a second end of the charge-discharge capacitor C1 and then grounded;
the first end of the first voltage-dividing resistor R3 is respectively connected with the input end of the first NOT gate U3 and the control module.
In some embodiments, the control module comprises:
the second voltage division unit is used for dividing the brake signal V0 again;
the first comparison unit is used for accessing the divided brake signal V2 and the divided brake signal V1 again and outputting a first comparison result;
and the first logic operation unit is used for carrying out logic operation on the first comparison result and outputting a first logic operation result.
In some embodiments, the second voltage division unit includes: a third voltage dividing resistor R1 and a fourth voltage dividing resistor R2;
the first comparison unit includes: a first comparator U1;
the first logical operation unit includes: a first and gate U6, a second not gate U4;
a non-inverting input terminal + of the first comparator U1 is connected to first terminals of the third voltage-dividing resistor R1 and the fourth voltage-dividing resistor R2, respectively, a second terminal of the third voltage-dividing resistor R1 is connected to the first voltage-dividing resistor R3, and a second terminal of the fourth voltage-dividing resistor R2 is grounded;
the negative phase input end of the first comparator U1 is respectively connected with the first ends of the charge and discharge resistor R5, the charge and discharge capacitor C1 and the second voltage-dividing resistor R4;
the output end of the first comparator U1 is connected to the second input end of the first and gate U6, the first input end of the first and gate U6 is connected to the braking signal V0, and the output end of the first and gate U6 is connected to the grating U7 of the braking module.
In some embodiments, the control module further comprises:
the second comparison unit is used for accessing the divided brake signal V2 and the divided brake signal V1 again and outputting a second comparison result;
the second logic operation unit is used for carrying out logic operation on the second comparison result and outputting a second logic operation result;
and the brake overload protection unit is used for triggering overload alarm according to the second logic operation result.
In some embodiments, the second comparing unit comprises: a second comparator U2;
the second logical operation unit includes: a second and gate U5;
the brake overload protection unit includes: a main control chip;
the positive phase input + of the second comparator U2 is connected to the negative phase input of the first comparator U1, and the negative phase input of the second comparator U2 is connected to the positive phase input of the first comparator U1 +;
the output end of the second comparator U2 is connected to the first input end of the second and gate U5, the second input end of the second and gate U5 is connected to the brake signal V0, and the output end of the second and gate U5 is connected to an alarm control pin ALM of the main control chip to trigger an overload alarm.
The utility model discloses used main device as follows:
u1 and U2 are comparators that output a high level when the positive phase input voltage is higher than the negative phase input voltage, and output a low level otherwise. The default input impedance is infinite and the input current is 0A.
The R5 resistance is chosen small enough to satisfy the rapid discharge function.
C1 is a charge/discharge capacitor, which can be changed according to the operation requirement of the circuit.
U3, U4 are logical not gates, the output is low when the input is high; and conversely, when the low level is input, the high level is output.
U5 and U6 are logic and gates, which output high when both input signals are high at the same time, and low otherwise.
U7 is the drive optocoupler, Q1 is the IGBT, D1 is the diode, and R13 is the braking resistance.
The working principle of the circuit is as follows:
1. if the braking signal V0 is low, U6 outputs low, U4 outputs high, pins 3 and 4 of U7 are not conductive, pin 4 of U7 is low, Q1 is in off state, and the system does not brake.
Since V0 is low, the U3 outputs high, the transistor T1 is driven to be turned on through the resistor R6, the R5 is turned on to GND, and the capacitor C1 is discharged through the resistors R5, R4 and R3 until the voltage value on the capacitor C1 reaches 0V. Meanwhile, as the V0 is at a low level, the ALM alarm signal output by the U5 is at a low level, and the brake overload alarm is not triggered.
2. If the brake signal V0 is high:
(1) u3 outputs low level, T1 is closed, and R5 is not conducted to GND;
(2) since V0 is high, the voltage V1 at the non-inverting input terminal of U1 is divided by R1, and the voltage value of the divided brake signal obtained by dividing the voltage by R2 is shown in the following formula:
V1＝V0*R2/(R1+R2)
where V1 is the voltage value of the divided brake signal.
The negative phase input voltage V2 of U1 is limited by a resistor R3, and the maximum voltage value after the voltage division limitation of R4 is shown as the following formula:
V2max＝V0*R3/(R3+R4)
because the voltage at the two ends of the capacitor C1 can not suddenly change, C1 charges at the moment of power-on, and the instantaneous voltage value V2, namely the voltage value of the brake signal after voltage division again, is shown by the following formula:
V2＝V2max*[1-exp(-t/Ra*V1)]
wherein Ra is R3// R4, i.e. Ra is the total resistance value after R3 and R4 are connected in parallel, the voltage value across the capacitor C1 is V2, and the initial voltage is 0V; t is the time variable, i.e. the duration of the high level of the braking signal V0, and the capacitor charging time Δ t of the capacitor C1 is also equal to the duration t of the high level of the braking signal V0. In the charging process of C1, the charging time period for which the voltage V2 across the capacitor C1 is equal to the voltage value V1 of the divided brake signal is detected to be T0, that is, when the duration T of the brake signal V0 being at the high level is T0, V2 is V1.
1) When the duration T of the high level of the braking signal V0 is relatively short, that is, the capacitor charging time Δ T of the capacitor C1 is T < T0, the timing sequence is shown in fig. 4:
the capacitor C1 starts charging from time t1, stops charging and starts discharging at time t2, at this time, when the duration t of the braking signal V0 being at high level is t2-t1, at this time, the voltage is low because the charging time of V2 is short, V1 is kept more than V2 during the high level of V0, at this time, U1 outputs high level, U6 outputs high level because the braking signal V0 is high level, U4 outputs low level, pin 3 and pin 4 of U7 are driven to be turned on, pin 4 of U7 outputs high level, Q1 is driven to be turned on after passing through R11, and the braking pipe enters a braking state; meanwhile, as V1 is larger than V2, U2 outputs low level, U5 outputs low level, and the brake overload does not alarm.
When braking is finished and the braking signal V0 goes to low level, the U3 outputs high level, the transistor T1 is driven to conduct through the resistor R6, the resistor R5 conducts to GND, at this time, the capacitor C1 is rapidly discharged by the resistors R5, R4 and R3 until the voltage value on the capacitor C1 reaches 0V, and the capacitor C1 finishes discharging at the time T3 shown in fig. 4, where the discharging formula is as follows:
Vf＝V2*exp(-t/Rb*C1)
wherein Rb is R3// R4// R5, namely Ra is the total resistance value of R3, R4 and R5 which are connected in parallel; exp is an exponential function with e as the base; vf is the instantaneous voltage during the discharge of the capacitor C1.
2) When the duration T of the braking signal V0 being at the high level is relatively long, the capacitor charging time Δ T of the capacitor C1 is also equal to the duration T of the braking signal V0 being at the high level, that is, the timing sequence in the scenario where T > T0 is that the capacitor charging time Δ T of the capacitor C1 is as shown in fig. 5:
the capacitor C1 starts to be charged from time t1, stops being charged and starts to be discharged at time t3, at this time, when the duration t of the brake signal V0 being at high level is t3-t1, at this time, the voltage is high because the charging time of V2 is long, V1 is less than V2, U1 outputs low level, when one signal input by the logic and gate is at low level and output is low level, at this time, U6 outputs low level, U4 outputs high level, the 3 rd and 4 th pins of U7 are driven to be not conducted, the 4 th pin of U7 outputs low level, Q1 is in a closed state, and the brake pipe does not brake; at the moment, because V1 is less than V2, U2 outputs high level, U5 outputs high level brake overload pulse alarm signal at t2, and sends the alarm signal to CPU for alarming.
Similarly, when the braking signal V0 changes to low level after the braking is finished, the U3 outputs high level, the transistor T1 is driven to be turned on by the resistor R6, the transistor R5 is turned on GND, at this time, the capacitor C1 is rapidly discharged by the resistors R5, R4 and R3 until the voltage value at the capacitor C1 reaches 0V, and the capacitor C1 finishes discharging at the time T4 shown in fig. 5, and the discharging formula is as follows:
Vf＝V2*exp(-t/Rb*C1)
wherein Rb is R3// R4// R5, namely Ra is the total resistance value of R3, R4 and R5 which are connected in parallel; exp is an exponential function with e as the base; vf is the instantaneous voltage during the discharge of the capacitor C1.
The utility model discloses utilize the circuit to the charge-discharge characteristic of resistance and electric capacity, with braking time control in the design demand within range, realize braking operation control, avoid leading to the too high damage of braking resistance temperature because of brake pipe opening time overlength, even burn out. The circuit is safe and reliable, and does not need external manual operation.
The utility model discloses utilize resistance capacitance charge-discharge characteristic to carry out brake control, safe and reliable more. When the braking signal V0 is low level due to the fact that the system braking time is too long or the control circuit breaks down, when the charging voltage value of the capacitor is higher than the circuit design requirement value, the brake pipe closing protection is performed forcibly, meanwhile, a brake alarm pulse signal is triggered to the CPU, and the warning is given to system operators, so that the effect of protecting the braking circuit and the braking resistor is achieved.
According to the utility model discloses a further aspect, the utility model discloses a braking overload protection system is further provided, including integrated chip and the peripheral circuit that has braking overload protection circuit in the above-mentioned embodiment. The peripheral circuits include a power supply circuit, a communication circuit, a memory circuit, and the like.
Specifically, this embodiment is a system embodiment corresponding to the method embodiment, and specific effects refer to the circuit embodiment, which is not described in detail herein.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of program modules is illustrated, and in practical applications, the above-described distribution of functions may be performed by different program modules, that is, the internal structure of the apparatus may be divided into different program units or modules to perform all or part of the above-described functions. Each program module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one processing unit, and the integrated unit may be implemented in a form of hardware, or may be implemented in a form of software program unit. In addition, the specific names of the program modules are only used for distinguishing the program modules from one another, and are not used for limiting the protection scope of the application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or recited in detail in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A brake overload protection circuit, comprising:
the charging and discharging module is used for charging and discharging when the input braking signal is at a high level;
the control module is used for carrying out logic operation according to the braking signal and transmitting an instruction corresponding to a logic operation result to the braking module so as to control the working state of the braking module;
and the braking module is used for receiving the instruction of the control module and executing corresponding braking action.
2. The brake overload protection circuit of claim 1, wherein the charge-discharge module comprises:
the first voltage division unit is used for dividing the brake signal;
a charge and discharge unit for performing charge and discharge;
and the driving switch unit is used for driving the charging and discharging unit to discharge or charge when the braking signal is at a high level and a low level.
3. The brake overload protection circuit of claim 2,
the first voltage division unit includes: a first voltage dividing resistor and a second voltage dividing resistor;
the driving switch unit comprises a first NOT gate, a first driving resistor and an N-type driving triode;
the charge and discharge unit includes: a charge and discharge capacitor, a bias resistor and a charge and discharge resistor;
the input end of the first not gate is connected with the brake signal, the output end of the first not gate is connected with the base electrode of the N-type driving triode after being connected with the first driving resistor, and the emitting electrode of the N-type driving triode is connected with the base electrode of the N-type driving triode through the biasing resistor and then grounded;
a collector of the N-type driving triode is connected with a first end of the charge and discharge resistor, and a second end of the charge and discharge resistor is respectively connected with a first end of the charge and discharge capacitor, a second end of the first divider resistor and a first end of the second divider resistor;
the second end of the second voltage-dividing resistor is connected with the second end of the charge-discharge capacitor and then grounded;
and the first end of the first voltage-dividing resistor is respectively connected with the input end of the first NOT gate and the control module.
4. The brake overload protection circuit of claim 3, wherein the control module comprises:
the second voltage division unit is used for dividing the brake signal again;
the first comparison unit is used for accessing the brake signal after voltage division and the brake signal after voltage division again and outputting a first comparison result;
and the first logic operation unit is used for carrying out logic operation on the first comparison result and outputting a first logic operation result.
5. The brake overload protection circuit of claim 4,
the second voltage division unit includes: a third voltage dividing resistor and a fourth voltage dividing resistor;
the first comparison unit includes: a first comparator;
the first logical operation unit includes: a first AND gate and a second NOT gate;
a positive phase input end of the first comparator is connected with first ends of the third voltage-dividing resistor and the fourth voltage-dividing resistor respectively, a second end of the third voltage-dividing resistor is connected with the first voltage-dividing resistor, and a second end of the fourth voltage-dividing resistor is grounded;
the negative phase input end of the first comparator is respectively connected with the first ends of the charge and discharge resistor, the charge and discharge capacitor and the second divider resistor;
the output end of the first comparator is connected with the second input end of the first AND gate, the first input end of the first AND gate is connected with the braking signal, and the output end of the first AND gate is connected with the grating of the braking module.
6. The brake overload protection circuit of claim 5, wherein the control module further comprises:
the second comparison unit is used for accessing the brake signal after voltage division and the brake signal after voltage division again and outputting a second comparison result;
the second logic operation unit is used for carrying out logic operation on the second comparison result and outputting a second logic operation result;
and the brake overload protection unit is used for triggering overload alarm according to the second logic operation result.
7. The brake overload protection circuit of claim 6,
the second comparing unit includes: a second comparator;
the second logical operation unit includes: a second AND gate;
the brake overload protection unit includes: a main control chip;
the positive phase input end of the second comparator is connected with the negative phase input end of the first comparator, and the negative phase input end of the second comparator is connected with the positive phase input end of the first comparator;
the output end of the second comparator is connected with the first input end of the second AND gate, the second input end of the second AND gate is connected with the braking signal, and the output end of the second AND gate is connected with the alarm control pin of the main control chip to trigger overload alarm.
8. A brake overload protection system comprising a chip incorporating a brake overload protection circuit according to any one of claims 1 to 7 and a peripheral circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123267256.3U CN216598963U (en) | 2021-12-23 | 2021-12-23 | Brake overload protection circuit and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123267256.3U CN216598963U (en) | 2021-12-23 | 2021-12-23 | Brake overload protection circuit and system |
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| CN216598963U true CN216598963U (en) | 2022-05-24 |
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| CN202123267256.3U Active CN216598963U (en) | 2021-12-23 | 2021-12-23 | Brake overload protection circuit and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116316406A (en) * | 2022-09-08 | 2023-06-23 | 瑞莱谱(杭州)医疗科技有限公司 | Mass spectrometer detection protection circuit |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116316406A (en) * | 2022-09-08 | 2023-06-23 | 瑞莱谱(杭州)医疗科技有限公司 | Mass spectrometer detection protection circuit |
| CN116316406B (en) * | 2022-09-08 | 2023-11-07 | 瑞莱谱(杭州)医疗科技有限公司 | Mass spectrometer detection protection circuit |
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