CN212135198U - Drive control system and signal conditioning and protecting circuit - Google Patents
Drive control system and signal conditioning and protecting circuit Download PDFInfo
- Publication number
- CN212135198U CN212135198U CN202021317865.8U CN202021317865U CN212135198U CN 212135198 U CN212135198 U CN 212135198U CN 202021317865 U CN202021317865 U CN 202021317865U CN 212135198 U CN212135198 U CN 212135198U
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- output
- operational amplifier
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The application provides a drive control system and a signal conditioning and protecting circuit, and belongs to the technical field of drive control. The drive control system includes: the output end of the signal conditioning and protecting circuit is respectively connected with the controller and the logic chip; the output end of the controller is connected with the logic chip; the output end of the logic chip is connected with the driving circuit; the output end of the driving circuit is connected with a load. The logic chip does not need to perform AD conversion on the conditioned digital signal, so that the judgment time is reduced, the driving circuit can be controlled in time, and the driving circuit and the load are prevented from being damaged.
Description
Technical Field
The application relates to the technical field of drive control, in particular to a drive control system and a signal conditioning and protecting circuit.
Background
The most common damage form of the driving circuit is overcurrent damage, so that overcurrent protection is performed on the driving circuit, and the fact that the driving circuit drives a load to work under a safe condition becomes particularly important.
In the prior art, a current sensor collects an output signal of a driving circuit, the collected output signal of the driving circuit is processed by an operational amplifier, the operational amplifier outputs an analog signal, a controller receives the analog signal and judges whether the output signal of the driving circuit is abnormal or not through software according to the analog signal, when the analog signal is abnormal, the output signal of the driving circuit is abnormal, the controller can cut off the output driving signal, and the driving circuit and a load stop working.
However, when the software determines that the analog signal is abnormal, the AD (analog-to-digital) conversion and the controller processing need to wait for a long time, so that the time taken to determine the analog signal is long, the driving signal is delayed to be cut off, the driving circuit is not controlled timely, and the driving circuit and the load are damaged.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a drive control system and signal are taked care of and protection circuit can solve among the prior art delay and cut off drive signal, leads to untimely to drive circuit's control, damages the problem of drive circuit and load.
An embodiment of the utility model provides a drive control system, include: the device comprises a signal conditioning and protecting circuit, a controller, a logic chip, a driving circuit, a load and a current sensor;
the output end of the signal conditioning and protecting circuit is respectively connected with the controller and the logic chip; the output end of the controller is connected with the logic chip; the output end of the logic chip is connected with the driving circuit; the output end of the driving circuit is connected with the load;
the current sensor is arranged between the output end of the driving circuit and the load, is connected with the signal conditioning and protecting circuit, and is used for collecting an output signal of the driving circuit and sending the output signal of the driving circuit to the signal conditioning and protecting circuit;
the signal conditioning and protecting circuit is used for conditioning an output signal of the driving circuit, sending a conditioned digital signal to the logic chip and sending a conditioned analog signal to the controller;
the controller is used for outputting a driving signal to the logic chip according to the conditioned analog signal;
and the logic chip is used for controlling the driving circuit to drive the load according to the driving signal and the digital signal.
Optionally, the signal conditioning and protecting circuit is specifically configured to output a low level signal to the logic chip when the conditioned digital signal is greater than a preset protection threshold; and outputting a high-level signal to the logic chip when the conditioned digital signal is less than or equal to the preset protection threshold value.
Optionally, the signal conditioning and protecting circuit includes: follower circuit, signal comparison circuit; the follower circuit includes: an operational amplifier;
the positive input end of the operational amplifier is connected with the output end of the current sensor; the inverting input end of the operational amplifier is grounded;
the first output end of the operational amplifier is connected with the input end of the signal comparison circuit;
the second output end of the operational amplifier is connected with the input end of the controller;
and the output end of the signal comparison circuit is connected with the input end of the logic chip.
Optionally, the signal comparison circuit includes: the overcurrent protection circuit comprises a first comparator, a second comparator, a positive overcurrent threshold circuit and a negative overcurrent threshold circuit;
the positive input end of the first comparator and the reverse input end of the second comparator are respectively connected with the first output end of the operational amplifier, the reverse input end of the first comparator is connected with the output end of the positive overcurrent threshold circuit, and the positive input end of the second comparator is connected with the output end of the negative overcurrent threshold circuit.
Optionally, the follower circuit further includes: the circuit comprises a first resistor, a second resistor, a first capacitor and a second capacitor;
the output end of the current sensor is respectively connected with the first resistor and the second resistor, the other end of the second resistor is respectively connected with the positive input end of the operational amplifier and one end of the first capacitor, and the other end of the first capacitor is grounded;
one end of the second capacitor is connected with a positive power supply end of the operational amplifier, and a negative power supply end of the operational amplifier is connected with the ground; the other end of the second capacitor is connected to the ground.
Optionally, the signal comparison circuit further includes: a third resistor, a fourth resistor and a third capacitor;
a first output end of the operational amplifier is respectively connected with one end of the third resistor and one end of the fourth resistor;
one end of the third capacitor is connected with one end of the third resistor, and the other end of the third capacitor is connected with the other end of the fourth resistor in a grounding mode.
Optionally, the controller is a single chip microcomputer.
Optionally, the current sensor is a hall sensor, the load is a three-phase motor, and the motor inputs a three-phase current signal; the driving circuit outputs three-phase current signals;
and the Hall sensors respectively acquire three-phase current signals output by the driving circuit.
The utility model discloses another aspect provides a signal conditioning and protection circuit, include: follower circuit, signal comparison circuit; the follower circuit includes: an operational amplifier;
the forward input end of the operational amplifier is used for receiving an input signal, and the reverse input end of the operational amplifier is grounded;
the first output end of the operational amplifier is connected with the input end of the signal comparison circuit;
the second output end of the operational amplifier is used for outputting the conditioned analog signal; and the signal comparison circuit is used for outputting the conditioned digital signal.
Optionally, the signal comparison circuit includes: the overcurrent protection circuit comprises a first comparator, a second comparator, a positive overcurrent threshold circuit and a negative overcurrent threshold circuit;
the positive input end of the first comparator and the reverse input end of the second comparator are respectively connected with the first output end of the operational amplifier, the reverse input end of the first comparator is connected with the output end of the positive overcurrent threshold circuit, and the positive input end of the second comparator is connected with the output end of the negative overcurrent threshold circuit.
The utility model discloses beneficial effect includes:
in the drive control system and the signal conditioning and protecting circuit provided by the embodiment of the utility model, the output end of the signal conditioning and protecting circuit is respectively connected with the controller and the logic chip; the output end of the controller is connected with the logic chip; the output end of the logic chip is connected with the driving circuit; the output end of the driving circuit is connected with a load; the current sensor is arranged between the output end of the driving circuit and the load, connected with the signal conditioning and protecting circuit and used for acquiring the output signal of the driving circuit and sending the output signal of the driving circuit to the signal conditioning and protecting circuit. The logic chip can judge whether the type of the received conditioned digital signal is consistent with a preset signal type or not based on the received conditioned digital signal, if so, the logic chip outputs a driving signal to the driving circuit, and if not, the logic chip cuts off the output driving signal, the logic chip does not need to carry out AD conversion on the conditioned digital signal, the judgment time is shortened, the driving circuit can be controlled in time, and the driving circuit and the load are prevented from being damaged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a drive control system according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a signal conditioning and protecting circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a signal conditioning and protecting circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a signal conditioning and protecting circuit according to an embodiment of the present invention.
Icon: signal conditioning and protection circuit-101; operational amplifier-U1A; signal comparison circuitry-1012; a first comparator-U2A; a second comparator-U2B; positive over-current threshold circuit-10123; negative over-current threshold circuit-10124; a controller-102; a logic chip-103; a drive circuit-104; load-105; a current sensor-106; a first resistance-R2; a second resistance-R3; a first capacitance-C1; a second capacitance-C2; a third capacitance-C3; a third resistor-R4; a fourth resistor-R6; a fifth resistor-R9; a sixth resistor-R10; a fourth capacitance-C7; a seventh resistor-R11; an eighth resistance-R12; a fifth capacitance-C8.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Fig. 1 is a schematic structural diagram of a driving control system provided by the present invention, please refer to fig. 1, the driving control system includes: the circuit comprises a signal conditioning and protecting circuit 101, a controller 102, a logic chip 103, a driving circuit 104, a load 105 and a current sensor 106.
Wherein, the output end of the signal conditioning and protecting circuit 101 is respectively connected with the controller 102 and the logic chip 103; the output end of the controller 102 is connected with the logic chip 103; the output end of the logic chip 103 is connected with the driving circuit 104; the output terminal of the driving circuit 104 is connected to a load 105; the current sensor 106 is disposed between the output end of the driving circuit 104 and the load 105, and is connected to the signal conditioning and protecting circuit 101, and is configured to collect an output signal of the driving circuit 104 and send the output signal of the driving circuit 104 to the signal conditioning and protecting circuit 101.
The signal conditioning and protecting circuit 101 is used for conditioning an output signal of the driving circuit 104, sending a conditioned digital signal to the logic chip 103, and sending a conditioned analog signal to the controller 102; the controller 102 is configured to output a driving signal to the logic chip 103 according to the conditioned analog signal; and the logic chip 103 is used for controlling the driving circuit 104 to drive the load 105 according to the driving signal.
Wherein, load 105 can be the motor, still can be other loads, the embodiment of the utility model provides a, do not do the restriction to this.
The following describes the operation of the drive control system in detail:
when the drive control system works, the current sensor 106 acquires an output signal of the drive circuit 104, and sends the output signal of the drive circuit 104 to the signal conditioning and protection circuit 101, after the signal conditioning and protection circuit 101 conditions the output signal of the drive circuit 104, the conditioned digital signal is sent to the logic chip 103, and the conditioned analog signal is sent to the controller 102, the controller 102 can output a drive signal to the logic chip 103 according to the conditioned analog signal, the logic chip 103 forwards the drive signal, and the drive circuit 104 is controlled by the drive signal to drive the load 105 to work.
When the type of the conditioned digital signal output by the signal conditioning and protection circuit 101 is not consistent with the preset signal type, at this time, the logic chip 103 may cut off the output of the driving signal to the driving circuit 104, and although the controller 102 may still send the driving signal to the logic chip 103 due to the judgment delay, the logic chip 103 cuts off the output of the driving signal to the driving circuit 104 according to the conditioned digital signal, thereby playing a role in protecting the driving circuit 104 and the load 105.
When the type of the conditioned digital signal output by the signal conditioning and protection circuit 101 is consistent with the preset signal type, the logic chip 103 may control the driving circuit 104 to drive the load 105 to operate through the driving signal.
To sum up, in the driving control system provided in the embodiment of the present invention, the output end of the signal conditioning and protecting circuit is connected to the controller and the logic chip respectively; the output end of the controller is connected with the logic chip; the output end of the control chip is connected with the driving circuit; the output end of the driving circuit is connected with a load; the current sensor is arranged between the output end of the driving circuit and the load, connected with the signal conditioning and protecting circuit and used for acquiring the output signal of the driving circuit and sending the output signal of the driving circuit to the signal conditioning and protecting circuit. The output signal of the drive circuit is conditioned through the signal conditioning protection circuit, the conditioned digital signal is sent to the logic chip after conditioning, the conditioned analog signal is sent to the controller, and the controller outputs the drive signal to the logic chip according to the conditioned analog signal. The logic chip can judge whether the type of the received conditioned digital signal is consistent with a preset signal type or not based on the received conditioned digital signal, if so, the logic chip outputs a driving signal to the driving circuit, and if not, the logic chip cuts off the output driving signal, the logic chip does not need to carry out AD conversion on the conditioned digital signal, the judgment time is shortened, the driving circuit can be controlled in time, and the driving circuit and the load are prevented from being damaged.
Optionally, the current sensor 106 collects an output signal of the driving circuit 104, the output signal of the driving circuit 104 may be a current signal, the current sensor 106 processes and converts the current signal, and then the output signal of the driving circuit 104 output by the current sensor 106 is a voltage signal. Accordingly, the output signal of the driving circuit 104 input by the signal conditioning and protection circuit 101 is a voltage signal.
Optionally, the driving circuit 104 is an IGBT (Insulated Gate Bipolar Transistor) driving circuit 104. The IGBT has the advantages of easy driving, simple control and high switching frequency of a field effect transistor, and can be widely applied to a plurality of fields, such as: the IGBT can be widely applied to the field of electric automobiles.
The signal conditioning and protection circuit 101 outputs the conditioned digital signal to the logic chip 103, which will be explained in detail below.
Optionally, the signal conditioning and protecting circuit 101 is specifically configured to output a low level signal to the logic chip 103 when an output signal of the driving circuit 104 is greater than a preset protection threshold; when the output signal of the driving circuit 104 is less than or equal to the preset protection threshold, a high level signal is output to the logic chip 103.
When the signal conditioning and protecting circuit 101 outputs a low level signal, it indicates that the output signal of the driving circuit 104 is abnormal, and at this time, the logic chip 103 can immediately cut off the output driving signal according to the low level signal, so as to avoid the damage of the driving circuit 104 and the load 105 caused by the untimely control of the driving circuit 104 due to the delay of the controller 102 still outputting the driving signal.
When the signal conditioning and protecting circuit 101 outputs a high level signal, the logic chip 103 determines that the output signal of the driving circuit 104 is not abnormal according to the high level signal, at this time, the driving signal sent by the controller 102 may be forwarded to the driving circuit 104, and the driving circuit 104 is controlled to drive the load 105 according to the driving signal output by the logic chip 103, so that the driving control of the load 105 is realized.
The embodiment of the present invention provides a protection for the driving circuit 104 and the load 105 by a dual protection method, wherein the logic chip 103 receives the conditioned digital signal, and the logic chip 103 determines whether to cut off the output driving signal of the logic chip 103 according to the conditioned digital signal.
In addition, after the controller 102 receives the conditioned analog signal, it may also determine whether the conditioned analog signal is abnormal, if so, the controller 102 cuts off the output driving signal, and under the dual protection, it may be avoided that the driving circuit 104 receives the driving signal and drives the load 105 to operate according to the driving signal when the output signal of the driving circuit 104 is abnormal, thereby causing damage to the driving circuit 104 and the load 105.
Fig. 2 is a schematic circuit diagram of a signal conditioning and protecting circuit 101 according to an embodiment of the present invention; as shown in fig. 2, optionally, the signal conditioning and protection circuit 101 includes: a follower circuit, a signal comparison circuit 1012; the follower circuit includes: an operational amplifier U1A; the positive input end of the operational amplifier U1A is connected with the output end of the current sensor 106; the inverting input terminal of the operational amplifier U1A is grounded; a first output terminal of the operational amplifier U1A is connected to an input terminal of the signal comparison circuit 1012; a second output terminal of the operational amplifier U1A is connected to an input terminal of the controller 102; an output terminal of the signal comparison circuit 1012 is connected to an input terminal of the logic chip 103.
The output signal of the driving circuit 104 output by the current sensor 106 is in the form of a voltage signal, the current sensor 106 can transmit the acquired output signal of the driving circuit 104 to the operational amplifier U1A, and the operational amplifier U1A receives the output signal of the driving circuit 104 and sends a conditioned analog signal to the signal comparison circuit 1012 and the controller 102. The signal comparison circuit 1012 receives the conditioned analog signal, processes the conditioned analog signal, and sends the conditioned digital signal to the logic chip 103; the controller 102 receives the conditioned analog signal and outputs a driving signal to the logic chip 103 according to the conditioned analog signal.
Optionally, the follower circuit further comprises: the circuit comprises a first resistor R2, a second resistor R3, a first capacitor C1 and a second capacitor C2; the output end of the current sensor 106 is connected with the first resistor R2 and the second resistor R3 respectively, the other end of the second resistor R3 is connected with the positive input end of the operational amplifier U1A and one end of the first capacitor C1 respectively, and the other end of the first capacitor C1 is connected to the ground; one end of the second capacitor C2 is connected with the positive power end of the operational amplifier U1A, and the negative power end of the operational amplifier U1A is connected to the ground; the other terminal of the second capacitor C2 is connected to ground.
As shown in fig. 2, the first resistor R2, the second resistor R3, the first capacitor C1, and the second capacitor C2 constitute a follower circuit. The follower circuit is used for enhancing the driving capability of signals and playing a certain role in front-stage and back-stage isolation.
When the follower circuit is operated, the output signal of the driving circuit 104 output by the current sensor 106 is in the form of a voltage signal, and the output signal of the driving circuit 104 is transmitted to the non-inverting input terminal of the operational amplifier U1A through the first resistor R2 and the second resistor R3.
Optionally, the current sensor 106 is a hall sensor, the load 105 is a three-phase motor, and the motor inputs a three-phase current signal; the drive circuit 104 outputs three-phase current signals.
Wherein the measuring range of the hall sensor can be, but is not limited to, 800A. When the measuring range of the Hall sensor is 800A, 2.5V is output when no current flows, when current flows, a sine wave signal which floats up and down by 2V and takes 2.5V as a reference point is output according to the magnitude of the current, and the maximum voltage output range is 0.5V-4.5V.
When the load 105 is a three-phase motor, the driving circuit 104 outputs three-phase current signals, and the hall sensor is disposed between the driving circuit 104 and the three-phase motor, and is configured to collect each phase current signal output by the driving circuit 104, and send each phase current signal to the signal conditioning and protecting circuit 101.
Fig. 3 is a schematic circuit diagram of a signal conditioning and protecting circuit 101 according to an embodiment of the present invention, referring to fig. 3, optionally, the controller 102 is a single chip.
When the controller 102 is a single chip microcomputer, the single chip microcomputer belongs to an integrated circuit chip, and the circuit chip integrates data operation and processing capability into a chip through application of an integrated circuit technology, so that high-speed processing of data can be realized.
Fig. 4 is a schematic circuit diagram of a signal conditioning and protecting circuit 101 according to an embodiment of the present invention; referring to fig. 4, optionally, the signal comparison circuit 1012 includes: a first comparator U2A, a second comparator U2B, a positive overcurrent threshold circuit 10123, and a negative overcurrent threshold circuit 10124; a positive input end of the first comparator U2A and a negative input end of the second comparator U2B are respectively connected with a first output end of the operational amplifier U1A, a negative input end of the first comparator U2A is connected with an output end of the positive overcurrent threshold circuit 10123, and a positive input end of the second comparator U2B is connected with an output end of the negative overcurrent threshold circuit 10124.
The output ends of the first comparator U2A and the second comparator U2B are both connected with the logic chip 103. The positive overcurrent threshold circuit 10123 constitutes a positive overcurrent threshold in circuit form; the negative overcurrent threshold circuit 10124 constitutes a negative overcurrent threshold in the form of a circuit, and both the positive overcurrent threshold and the negative overcurrent threshold refer to preset protection thresholds.
As shown in FIG. 4, the positive over-current threshold circuit 10123 may be composed of a fifth resistor R9, a sixth resistor R10-R10, and a fourth capacitor C7; the negative current threshold circuit 10124 may include a seventh resistor R11, an eighth resistor R12, and a fifth capacitor C8.
The first comparator U2A receives the conditioned analog signal, compares the conditioned analog signal with a positive overcurrent threshold, outputs a low level signal when the conditioned analog signal input by the first comparator U2A is greater than the positive overcurrent threshold, and outputs a high level signal when the conditioned analog signal input by the first comparator U2A is less than or equal to the positive overcurrent threshold.
The second comparator U2B receives the conditioned analog signal, compares the conditioned analog signal with the negative overcurrent threshold, outputs a low level signal when the conditioned analog signal input by the second comparator U2B is greater than the negative overcurrent threshold, and outputs a high level signal when the conditioned analog signal input by the second comparator U2B is less than or equal to the negative overcurrent threshold.
Referring to fig. 4, optionally, the signal comparison circuit 1012 further includes: a third resistor R4, a fourth resistor R6 and a third capacitor C3; a first output end of the operational amplifier U1A is connected to one end of the third resistor R4 and one end of the fourth resistor R6, respectively; one end of the third capacitor C3 is connected to one end of the third resistor R4, and the other end of the third capacitor C3 is connected to the other end of the fourth resistor R6. The first comparator U2A, the second comparator U2B, the third resistor R4, the fourth resistor R6, and the third capacitor C3 constitute a signal comparison circuit 1012.
Fig. 4 is a schematic circuit diagram of a signal conditioning and protecting circuit 101 provided by an embodiment of the present invention, referring to fig. 4, in another aspect of the embodiment of the present invention, a signal conditioning and protecting circuit 101 is further provided, including: a follower circuit, a signal comparison circuit 1012; the follower circuit includes: an operational amplifier U1A; the positive input end of the operational amplifier U1A is used for receiving an input signal, and the negative input end of the operational amplifier U1A is grounded; a first output terminal of the operational amplifier U1A is connected to an input terminal of the signal comparison circuit 1012; a second output end of the operational amplifier U1A is used for outputting the conditioned analog signal; and a signal comparison circuit 1012 for outputting the conditioned digital signal.
The output of operational amplifier U1A may include: the first output end of the operational amplifier U1A transmits the conditioned analog signal to the signal comparison circuit 1012, the second output end transmits the conditioned analog signal to the controller 102, and the signal comparator processes the conditioned analog signal and outputs a conditioned digital signal.
The following explains an example of the signal conditioning and protection circuit 101.
As shown in fig. 4, R2, R3, C1, C2 and U1A constitute a follower circuit. The output signal (voltage signal) of the current sensor 106 output driving circuit 104 enters the non-inverting input terminal (pin 3) of the operational amplifier U1A through R2 and R3, and the R2 is externally connected to a predetermined voltage, which may be 5V. A capacitor C1 is connected between the R3 and the operational amplifier U1A, and the output end of the capacitor C1 is grounded, so that the filtering function can be achieved. The inverting output terminal (the 2 nd pin) of the operational amplifier U1A is connected to the second output terminal of the operational amplifier U1A, a resistor R5 is further connected between the second output terminal and the controller 102, a capacitor C4 is further disposed between the resistor R5 and the controller 102, and the other end of the capacitor C4 is grounded. The positive power supply of the operational amplifier U1A is externally connected to a preset voltage and a capacitor C2, respectively, where the preset voltage may be 5V, and the other end of the capacitor is grounded. The capacitor C2 grounded may act as a filter.
Optionally, the signal comparison circuit 1012 includes: a first comparator U2A, a second comparator U2B, a positive overcurrent threshold circuit 10123, and a negative overcurrent threshold circuit 10124.
As shown in fig. 4, U2A, U2B, R4, C3, R6, R9, R10, C7, R11, R12, and C8 form a comparator circuit, wherein R9, R10, and C7 form a positive overcurrent threshold circuit 10123, R9 and C7 are grounded in parallel, R9 may be connected to a preset voltage, and the preset voltage may be, but is not limited to, 5V; r11, R12 and C8 form a negative overcurrent threshold circuit 10124, R12 and C8 are grounded in parallel, and R11 can be connected with a preset voltage which can be, but is not limited to, 5V. The positive overcurrent threshold circuit 10123 may constitute a positive overcurrent threshold, and the negative overcurrent threshold circuit 10124 may constitute a negative overcurrent threshold.
The positive over-current threshold value may be calculated by the following equation: R10/(R9+ R10) (preset voltage connected to R9); the negative overcurrent threshold can be calculated by the following formula: R12/(R12+ R11) (preset voltage connected to R11). Where denotes multiplication.
Continuing with the above explanation of the example of the signal conditioning and protection circuit 101, as shown in fig. 4, the first output terminal and the second output terminal of the operational amplifier U1A both output conditioned analog signals; a first output terminal of the operational amplifier U1A is connected to a positive input terminal (pin 5) of the first comparator U2A and a negative input terminal (pin 6) of the second comparator U2B through a resistor R4, wherein a capacitor C3 is further disposed between the R4 and the positive input terminal of the first comparator U2A and the negative input terminal of the second comparator U2B, a resistor R6, a capacitor C3 and a resistor R6 are grounded in parallel, the negative input terminal (pin 4) of the first comparator U2A is an input terminal of the negative over-current threshold circuit 10124, the positive input terminal (pin 7) of the second comparator U2B is an input terminal of the positive over-current threshold circuit, when the conditioned analog signals received by the U2A and U2B are compared with the positive over-current threshold and the negative over-current threshold, the conditioned analog signal is greater than the positive over-current threshold, the U2A outputs a low level signal, or the conditioned analog signal is greater than the negative over-current threshold, U2B outputs a low signal.
The output end of the first comparator U2A is further provided with a capacitor C5 and a resistor R7, one end of the capacitor C5 is connected with the output end of the first comparator U2A, and the other end is grounded; one end of the resistor R7 is connected to the output end of the first comparator U2A, and the other end of the resistor R7 is connected to a predetermined voltage, which may be, but is not limited to, 3.3V.
The output end of the second comparator U2B is further provided with a capacitor C6 and a resistor R8, one end of the capacitor C6 is connected with the output end of the second comparator U2B, and the other end is grounded; one end of the resistor R8 is connected to the output end of the second comparator U2B, and the other end of the resistor R8 is connected to a predetermined voltage, which may be, but is not limited to, 3.3V.
Optionally, the model of the operational amplifier U1A is TLV2464AQPWRQ1, and the first comparator U2A and the second comparator U2B are integrated into a 2-in-one integrated chip, which is LM2901AVQPWRQ 1. When the logic chip 103 receives a low-level signal output by at least one of the U2A and the U2B, the output driving signal of the logic chip 103 can be cut off rapidly.
It should be noted that fig. 4 also shows the resistance value of each resistor and the capacity of the capacitor by way of example. The size of each resistance and electric capacity can set up according to practical application in concrete circuit, the utility model discloses do not do the injecing to this. In fig. 4, a capacitor is grounded at a plurality of positions, which can play a role of filtering, and the R5, R7 and R8 make the circuit maintain a stable state, which plays a role of stabilizing the circuit.
To sum up, the embodiment of the utility model provides a signal conditioning and protection circuit, this circuit is simple, and the clear interference immunity of logic is strong, and is rapid to unusual signal response, and safe and reliable saves electronic components, reduce cost.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A drive control system, comprising: the device comprises a signal conditioning and protecting circuit, a controller, a logic chip, a driving circuit, a load and a current sensor;
the output end of the signal conditioning and protecting circuit is respectively connected with the controller and the logic chip; the output end of the controller is connected with the logic chip; the output end of the logic chip is connected with the driving circuit; the output end of the driving circuit is connected with the load;
the current sensor is arranged between the output end of the driving circuit and the load, is connected with the signal conditioning and protecting circuit, and is used for collecting an output signal of the driving circuit and sending the output signal of the driving circuit to the signal conditioning and protecting circuit;
the signal conditioning and protecting circuit is used for conditioning an output signal of the driving circuit, sending a conditioned digital signal to the logic chip and sending a conditioned analog signal to the controller;
the controller is used for outputting a driving signal to the logic chip according to the conditioned analog signal;
and the logic chip is used for controlling the driving circuit to drive the load according to the driving signal.
2. The system of claim 1, wherein the signal conditioning and protection circuit is specifically configured to output a low level signal to the logic chip when the output signal of the driving circuit is greater than a preset protection threshold; and when the output signal of the driving circuit is less than or equal to the preset protection threshold value, outputting a high-level signal to the logic chip.
3. The system of claim 1, wherein the signal conditioning and protection circuit comprises: follower circuit, signal comparison circuit; the follower circuit includes: an operational amplifier;
the positive input end of the operational amplifier is connected with the output end of the current sensor; the inverting input end of the operational amplifier is grounded;
the first output end of the operational amplifier is connected with the input end of the signal comparison circuit;
the second output end of the operational amplifier is connected with the input end of the controller;
and the output end of the signal comparison circuit is connected with the input end of the logic chip.
4. The system of claim 3, wherein the signal comparison circuit comprises: the overcurrent protection circuit comprises a first comparator, a second comparator, a positive overcurrent threshold circuit and a negative overcurrent threshold circuit;
the positive input end of the first comparator and the reverse input end of the second comparator are respectively connected with the first output end of the operational amplifier, the reverse input end of the first comparator is connected with the output end of the positive overcurrent threshold circuit, and the positive input end of the second comparator is connected with the output end of the negative overcurrent threshold circuit.
5. The system of claim 3, wherein the follower circuit further comprises: the circuit comprises a first resistor, a second resistor, a first capacitor and a second capacitor;
the output end of the current sensor is respectively connected with the first resistor and the second resistor, the other end of the second resistor is respectively connected with the positive input end of the operational amplifier and one end of the first capacitor, and the other end of the first capacitor is grounded;
one end of the second capacitor is connected with a positive power supply end of the operational amplifier, and a negative power supply end of the operational amplifier is connected with the ground; the other end of the second capacitor is connected to the ground.
6. The system of claim 4, wherein the signal comparison circuit further comprises: a third resistor, a fourth resistor and a third capacitor;
a first output end of the operational amplifier is respectively connected with one end of the third resistor and one end of the fourth resistor;
one end of the third capacitor is connected with one end of the third resistor, and the other end of the third capacitor is connected with the other end of the fourth resistor in a grounding mode.
7. The system of claim 1, wherein the controller is a single chip microcomputer.
8. The system of claim 1, wherein the current sensor is a hall sensor, the load is a three-phase motor, and the motor inputs a three-phase current signal; the driving circuit outputs three-phase current signals;
and the Hall sensors respectively acquire three-phase current signals output by the driving circuit.
9. A signal conditioning and protection circuit, comprising: follower circuit, signal comparison circuit; the follower circuit includes: an operational amplifier;
the forward input end of the operational amplifier is used for receiving an input signal, and the reverse input end of the operational amplifier is grounded;
the first output end of the operational amplifier is connected with the input end of the signal comparison circuit;
the second output end of the operational amplifier is used for outputting the conditioned analog signal; and the signal comparison circuit is used for outputting the conditioned digital signal.
10. The circuit of claim 9, wherein the signal comparison circuit comprises: the overcurrent protection circuit comprises a first comparator, a second comparator, a positive overcurrent threshold circuit and a negative overcurrent threshold circuit;
the positive input end of the first comparator and the reverse input end of the second comparator are respectively connected with the first output end of the operational amplifier, the reverse input end of the first comparator is connected with the output end of the positive overcurrent threshold circuit, and the positive input end of the second comparator is connected with the output end of the negative overcurrent threshold circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021317865.8U CN212135198U (en) | 2020-07-07 | 2020-07-07 | Drive control system and signal conditioning and protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021317865.8U CN212135198U (en) | 2020-07-07 | 2020-07-07 | Drive control system and signal conditioning and protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212135198U true CN212135198U (en) | 2020-12-11 |
Family
ID=73685430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021317865.8U Active CN212135198U (en) | 2020-07-07 | 2020-07-07 | Drive control system and signal conditioning and protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212135198U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114389611A (en) * | 2021-12-31 | 2022-04-22 | 芯海科技（深圳）股份有限公司 | Signal detection circuit, integrated circuit, and electronic device |
-
2020
- 2020-07-07 CN CN202021317865.8U patent/CN212135198U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114389611A (en) * | 2021-12-31 | 2022-04-22 | 芯海科技（深圳）股份有限公司 | Signal detection circuit, integrated circuit, and electronic device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106911122B (en) | A kind of motor controller overcurrent protective device, electric machine controller and electric car | |
| CN212135198U (en) | Drive control system and signal conditioning and protecting circuit | |
| CN110994557A (en) | Phase loss detection method and protection mechanism for PMSM motor | |
| CN111983300A (en) | Motor current detection method and system, stirrer and storage medium | |
| CN210155536U (en) | Sampling circuit and motor control system | |
| CN109067307B (en) | Temperature detection and protection method, system and device of motor drive circuit and motor protection system | |
| CN109347064B (en) | Three-phase current sampling and overcurrent protection circuit | |
| CN206135387U (en) | Undervoltage protection circuit is crossed to self -resuming | |
| CN211530726U (en) | Overvoltage protection circuit and instrument terminal | |
| CN209516620U (en) | A kind of output protection circuit of DC power supply | |
| CN110971216B (en) | Overcurrent protection circuit | |
| CN101697428A (en) | Dynamic switching control device for uninterruptible power supply system to add impulsive load suddenly | |
| CN201821317U (en) | Frequency-conversion driven and controlled protection detecting and feedback circuit of mine hoist | |
| CN201289502Y (en) | Device for processing zero line interference of energy counting device | |
| CN113422350B (en) | Overcurrent protection circuit and air conditioning equipment | |
| CN104078931A (en) | Three-phase alternating current power supply sequence protection method, protection circuit, protector and air conditioner | |
| CN202562993U (en) | Three-phase voltage sampling circuit | |
| CN116298496A (en) | Power detection system and method for multifunctional isolating switch driving motor | |
| CN202374167U (en) | Driver with IGBT overcurrent protection function | |
| CN111007310B (en) | Intelligent Internet of things chip and current detection circuit thereof | |
| CN2779419Y (en) | Pre-detection circuit for automobile load short circuit | |
| CN212162798U (en) | Self-powered photovoltaic tracking controller current detection and overcurrent protection self-locking system | |
| CN212723078U (en) | Current detection circuit for brushless direct current motor drive control system | |
| CN205158579U (en) | Motor electric current demodulation alarm | |
| CN220874215U (en) | Overcurrent protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |