CN107861019B - H-bridge detection system and detection method - Google Patents
H-bridge detection system and detection method Download PDFInfo
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- CN107861019B CN107861019B CN201711180446.7A CN201711180446A CN107861019B CN 107861019 B CN107861019 B CN 107861019B CN 201711180446 A CN201711180446 A CN 201711180446A CN 107861019 B CN107861019 B CN 107861019B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
Abstract
The application discloses a detection system and a detection method for an H bridge. The application provides a detection system and a detection method of an H bridge, wherein the detection system of the H bridge comprises a pulse generation circuit, a first sampling resistor, a second sampling resistor and a potential comparison circuit, and the detection system of the H bridge has a simple circuit structure and can realize the detection of the connection state of the H bridge; after the pulse generating circuit generates the pulse and inputs the pulse to the power supply negative electrode terminal of the first H bridge, whether the electric potentials of the power supply negative electrode terminal of the first H bridge and the power supply negative electrode terminal of the second H bridge are consistent or not is detected through the electric potential comparison circuit, so that the connection state of the first H bridge and the second H bridge is judged, the connection state detection method of the H bridge is rapid and convenient, and the detection result is accurate.
Description
Technical Field
The application relates to the field of motor driving, in particular to a detection system and a detection method of an H bridge.
Background
In motor drive, the inside H bridge that adopts of driver chip drives the motor, drives a step motor and needs two H bridges, drives a direct current and has brush motor and need an H bridge. In order to increase the driving capability of the H-bridge to the motor, the two H-bridges are connected in parallel and then are used for driving the same motor, so that the driving current is increased, and the driving capability to the motor is increased.
Disclosure of Invention
In order to solve the technical problems, the application aims to provide a detection system and a detection method for H-bridges, which are used for detecting whether two H-bridges are applied in parallel.
The technical scheme adopted by the application is as follows: the H bridge detection system comprises a first H bridge, a second H bridge, a pulse generation circuit, a first sampling resistor, a second sampling resistor and a potential comparison circuit, wherein the first H bridge and the second H bridge are used for driving a motor and are two H bridges to be detected to be connected in parallel or not, and the first H bridge and the second H bridge are connected with the motor; the output end of the pulse generating circuit is connected with the power supply negative end of the first H bridge and is used for outputting instantaneous pulses to the power supply negative end of the first H bridge; the power supply negative terminal of the first H bridge is grounded through a first sampling resistor, and the power supply negative terminal of the second H bridge is grounded through a second sampling resistor; the non-grounding end of the first sampling resistor (namely the power negative end of the first H bridge) and the non-grounding end of the second sampling resistor (namely the power negative end of the second H bridge) are connected with the input end of the potential comparison circuit; the potential comparison circuit is used for detecting whether the potentials of the power supply negative electrode terminal of the first H bridge and the power supply negative electrode terminal of the second H bridge are consistent when the transient pulse is input to the power supply negative electrode terminal of the first H bridge so as to judge the connection state of the first H bridge and the second H bridge.
Further, the first H bridge comprises a first NMOS tube, a second NMOS tube, a third NMOS tube and a fourth NMOS tube, wherein the drain electrode of the first NMOS tube and the drain electrode of the second NMOS tube are used as the positive electrode of the power supply of the first H bridge to be connected with the positive electrode of the power supply, the source electrode of the first NMOS tube is connected with the drain electrode of the third NMOS tube, the source electrode of the second NMOS tube is connected with the drain electrode of the fourth NMOS tube, and the source electrode of the third NMOS tube and the source electrode of the fourth NMOS tube are used as the negative electrode of the power supply of the first H bridge.
Further, the second H-bridge includes a fifth NMOS, a sixth NMOS, a seventh NMOS, and an eighth NMOS, where the drain of the fifth NMOS and the drain of the sixth NMOS are connected to the positive power supply terminal of the second H-bridge, the source of the fifth NMOS is connected to the drain of the seventh NMOS, the source of the sixth NMOS is connected to the drain of the eighth NMOS, and the source of the seventh NMOS and the source of the eighth NMOS are connected to the negative power supply terminal of the second H-bridge.
Further, the potential comparison circuit comprises a potential comparator, and the non-grounding end of the first sampling resistor and the non-grounding end of the second sampling resistor are connected with the input end of the potential comparator.
Further, the voltage of the power supply negative electrode end of the first H bridge is equal to that of the power supply negative electrode end of the second H bridge, the potential comparator outputs a high-level signal, and the first H bridge and the second H bridge are applied in parallel; when the electric potentials of the power supply negative electrode end of the first H bridge and the electric potential of the power supply negative electrode end of the second H bridge are unequal, the electric potential comparator outputs a low-level signal, and the first H bridge and the second H bridge are applied in non-parallel.
Further, the potential comparison circuit further comprises a single chip microcomputer and a detection result prompting unit, wherein the output end of the potential comparator is connected with the input end of the single chip microcomputer, and the output end of the single chip microcomputer is connected with the input end of the detection result prompting unit.
Further, the detection result prompting unit is an indicator light and/or a voice output unit and/or a display unit.
The application adopts another technical scheme that: the H bridge detection method is applied to the H bridge detection system and comprises the following steps,
generating an instantaneous pulse by using a pulse generating circuit and inputting the instantaneous pulse into a power supply negative end of the first H bridge;
when the transient pulse is input to the power supply negative terminal of the first H bridge, a potential comparison circuit is used for detecting whether the potentials of the power supply negative terminal of the first H bridge and the power supply negative terminal of the second H bridge are consistent or not so as to judge the connection state of the first H bridge and the second H bridge.
Further, the voltage of the power supply negative terminal of the first H bridge is equal to that of the power supply negative terminal of the second H bridge, the potential comparison circuit outputs a high-level signal, and the first H bridge and the second H bridge are applied in parallel; when the electric potentials of the power supply negative electrode terminal of the first H bridge and the power supply negative electrode terminal of the second H bridge are unequal, the electric potential comparison circuit outputs a low-level signal, and the first H bridge and the second H bridge are applied in non-parallel.
Further, the method for detecting the H bridge further comprises the following steps:
and outputting a judging result.
The beneficial effects of the application are as follows:
the application relates to a detection system and a detection method of an H bridge, wherein the detection system of the H bridge comprises a pulse generation circuit, a first sampling resistor, a second sampling resistor and a potential comparison circuit, and the circuit has a simple structure and can realize the detection of the connection state of two H bridges; after the pulse generating circuit generates the pulse and inputs the pulse to the power supply negative electrode terminal of the first H bridge, whether the electric potentials of the power supply negative electrode terminal of the first H bridge and the power supply negative electrode terminal of the second H bridge are consistent or not is detected through the electric potential comparison circuit, so that the connection state of the first H bridge and the second H bridge is judged, the connection state detection method of the H bridge is rapid and convenient, and the detection result is accurate.
Drawings
The following is a further description of embodiments of the application, taken in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of an embodiment of an H-bridge detection system according to the present application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
Referring to fig. 1, fig. 1 is a schematic diagram showing a specific embodiment of an H-bridge detection system according to the present application, where the H-bridge detection system includes a first H-bridge, a second H-bridge, a pulse generating circuit (not shown), a first sampling resistor R1, a second sampling resistor R2, and a potential comparing circuit, the first H-bridge and the second H-bridge are opposite concepts, and are two H-bridges to be detected whether they are connected in parallel, in this embodiment, the first H-bridge is a, the second H-bridge is B, and both the first H-bridge a and the second H-bridge B are used for driving a motor, where the first H-bridge and the second H-bridge are connected with the motor; the output end of the pulse generating circuit is connected with the power supply negative end of the first H bridge A and is used for outputting instantaneous pulses to the power supply negative end of the first H bridge A; the power supply negative terminal of the first H bridge A is grounded through a first sampling resistor R1, and the power supply negative terminal of the second H bridge B is grounded through a second sampling resistor R2; the non-grounding end of the first sampling resistor R1 (namely the power negative end of the first H bridge A) and the non-grounding end of the second sampling resistor R2 (namely the power negative end of the second H bridge B) are connected with the input end of the potential comparison circuit; the potential comparison circuit is used for detecting whether the potentials of the power supply negative electrode terminal of the first H bridge A and the power supply negative electrode terminal of the second H bridge B are consistent when the transient pulse is input to the power supply negative electrode terminal of the first H bridge A so as to judge the connection state of the first H bridge A and the second H bridge B. In this embodiment, the transient pulse is input to the power negative terminal of the second H-bridge B, and the potential comparison circuit detects the potentials of the power negative terminal (i.e. the point A1) of the first H-bridge a and the power negative terminal (i.e. the point B1) of the second H-bridge B to determine the connection state of the first H-bridge a and the second H-bridge B.
The application discloses a detection system of an H bridge, which comprises a first H bridge, a second H bridge, a pulse generation circuit, a first sampling resistor, a second sampling resistor and a potential comparison circuit, wherein the first H bridge is connected with the first sampling resistor; the pulse generating circuit is used for outputting an instantaneous pulse to the power supply negative electrode terminal of the first H bridge, the potential comparing circuit is used for detecting whether the potentials of the power supply negative electrode terminal of the first H bridge and the power supply negative electrode terminal of the second H bridge are consistent or not when the instantaneous pulse is input to the power supply negative electrode terminal of the first H bridge so as to judge the connection state of the first H bridge and the second H bridge, when the potentials of the power supply negative electrode terminal of the first H bridge and the power supply negative electrode terminal of the second H bridge are equal, the output of the potential comparing circuit is high, the first H bridge and the second H bridge are applied in parallel, and the motors driven by the first H bridge and the second H bridge are the same motor; when the electric potentials of the power supply negative electrode terminal of the first H bridge and the power supply negative electrode terminal of the second H bridge are unequal, the output of the electric potential comparison circuit is low, and the first H bridge and the second H bridge are applied in a non-parallel mode.
As a further improvement of the technical scheme, referring to fig. 1, the first H-bridge a includes a first NMOS transistor Q1, a second NMOS transistor Q2, a third NMOS transistor Q3, and a fourth NMOS transistor Q4, where the drain of the first NMOS transistor Q1 and the drain of the second NMOS transistor Q2 serve as the positive power terminal Vm of the first H-bridge a and are connected to the positive power terminal Vm, the source of the first NMOS transistor Q1 is connected to the drain of the third NMOS transistor Q3, the source of the second NMOS transistor Q2 is connected to the drain of the fourth NMOS transistor Q4, and the source of the third NMOS transistor Q3 and the source of the fourth NMOS transistor Q4 serve as the negative power terminal of the first H-bridge a;
the second H-bridge B includes a fifth NMOS transistor Q5, a sixth NMOS transistor Q6, a seventh NMOS transistor Q7, and an eighth NMOS transistor Q8, where the drain of the fifth NMOS transistor Q5 and the drain of the sixth NMOS transistor Q6 are connected to the power positive terminal Vm of the second H-bridge B, the source of the fifth NMOS transistor Q5 is connected to the drain of the seventh NMOS transistor Q7, the source of the sixth NMOS transistor Q6 is connected to the drain of the eighth NMOS transistor Q8, and the source of the seventh NMOS transistor Q7 and the source of the eighth NMOS transistor Q8 are connected to the power negative terminal of the second H-bridge B.
In addition, a MOS transistor control circuit is further provided for controlling on/off of the NMOS transistors of the two H-bridges, and the gate of the first NMOS transistor Q1, the gate of the second NMOS transistor Q2, the gate of the third NMOS transistor Q3, the gate of the fourth NMOS transistor Q4, the gate of the fifth NMOS transistor Q5, the gate of the sixth NMOS transistor Q6, the gate of the seventh NMOS transistor Q7, and the gate of the eighth NMOS transistor Q8 are connected to the MOS transistor control circuit.
As a further improvement of the technical scheme, the NMOS transistor can be replaced by a triode.
As a further improvement of the technical scheme, the potential comparison circuit comprises a potential comparator (namely a voltage comparator) and a singlechip for data processing and judgment, wherein the non-grounding end of the first sampling resistor and the non-grounding end of the second sampling resistor are connected with the input end of the potential comparator, and the output end of the potential comparator is connected with the input end of the singlechip. The potential comparator is used for comparing the potential of the power supply negative electrode end of the first H bridge with the potential of the power supply negative electrode end of the second H bridge, and sending detected data into the singlechip for processing.
As a further improvement of the technical scheme, the potential comparison circuit further comprises a detection result prompting unit, and the output end of the singlechip is connected with the input end of the detection result prompting unit. The detection result prompting unit is an indicator light and/or a voice output unit and/or a display unit, the indicator light can be realized by adopting an LED lamp, different colors are displayed by controlling the LED lamp to express different detection results, for example, a green light represents that the detection result is passing, two H bridges are applied in parallel, a red light represents that the detection result is not passing, and the two H bridges are applied in non-parallel; the voice output unit directly plays and outputs the detection result by using sound equipment such as a loudspeaker and the like, so that a user can conveniently and directly acquire the detection result; the display unit directly displays the detection result by using a display screen, for example, the display word is parallel or non-parallel; in fact, one of the three detection result presenting units may be used to realize the detection result output, or may be used in combination with each other.
The application also provides a detection method of the H bridge based on the detection system of the H bridge, which comprises the following steps,
generating an instantaneous pulse by using a pulse generating circuit and inputting the instantaneous pulse into a power supply negative end of the first H bridge;
when the instantaneous pulse is input to the power supply negative terminal of the first H bridge, a potential comparison circuit is used for detecting whether the potentials of the power supply negative terminal of the first H bridge and the power supply negative terminal of the second H bridge are consistent or not so as to judge the connection state of the first H bridge and the second H bridge.
In this embodiment, referring to fig. 1, the pulse generating circuit generates an instantaneous pulse and inputs the instantaneous pulse to the power negative terminal of the second H-bridge B, i.e. the source of the eighth NMOS transistor Q8; the potential comparison circuit detects the potential of the power supply negative terminal of the first H bridge and the potential of the power supply negative terminal of the second H bridge; when the electric potentials of the power supply negative electrode end of the first H bridge and the electric potential of the power supply negative electrode end of the second H bridge are equal, the first H bridge and the second H bridge are applied in parallel; when the electric potentials of the power supply negative electrode terminal of the first H bridge and the power supply negative electrode terminal of the second H bridge are unequal, the first H bridge and the second H bridge are applied in non-parallel. As shown in fig. 1, in the present embodiment, the potential comparison circuit obtains the potentials of the source (i.e., the point A1) of the fourth NMOS transistor Q4 and the source (i.e., the point B1) of the seventh NMOS transistor Q7; and judging whether the potentials of the source electrode of the four NMOS tube Q4 and the source electrode of the seventh NMOS tube Q7 are equal, and when the potential of the point B1 is equal to the potential of the point A1, indicating that the first H bridge and the second H bridge are applied in parallel.
In fact, the first H bridge and the second H bridge can be arranged in a driving motor circuit in a chip, an instantaneous pulse is added at a point B1 of the second H bridge at the moment of chip power-on to enable the potential of the point B1 to rise, then the potential of the point B1 and the potential of a corresponding point A1 of the first H bridge are detected through a potential comparison circuit, and when the potentials of the two points are equal, the two H bridges are successfully connected in parallel; otherwise, the two H bridges are not connected in parallel, and the parallel connection fails; the connection state detection method of the H bridge is rapid and convenient, and the detection result is accurate.
As a further improvement of the technical scheme, the H-bridge detection method further comprises the steps of:
and outputting a judging result.
According to the first method, different judgment results, namely detection results, can be output by displaying different colors through the LED lamps, for example, a green light represents that the detection results pass, two H bridges are applied in parallel, a red light represents that the detection results do not pass, and two H bridges are applied in non-parallel; in the second method, the detection result is directly played and output by voice, so that the user can conveniently and directly acquire the detection result; the last method is to directly display and output the detection result, for example, displaying the word parallel or non-parallel; in fact, outputting the detection result may be achieved using one of three methods, or may be achieved in combination with each other.
While the preferred embodiment of the present application has been described in detail, the present application is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present application, and the equivalent modifications or substitutions are included in the scope of the present application as defined in the appended claims.
Claims (10)
1. The H bridge detection system comprises a first H bridge and a second H bridge, wherein the first H bridge and the second H bridge are both used for driving a motor, and the first H bridge and the second H bridge are connected with the motor; it is characterized in that the method comprises the steps of,
the H bridge detection system further comprises a pulse generation circuit, a first sampling resistor, a second sampling resistor and a potential comparison circuit; the output end of the pulse generating circuit is connected with the power supply negative end of the first H bridge and is used for outputting instantaneous pulses to the power supply negative end of the first H bridge; the power supply negative terminal of the first H bridge is grounded through a first sampling resistor, and the power supply negative terminal of the second H bridge is grounded through a second sampling resistor; the non-grounding end of the first sampling resistor and the non-grounding end of the second sampling resistor are connected with the input end of the potential comparison circuit; the potential comparison circuit is used for detecting whether the potentials of the power supply negative electrode terminal of the first H bridge and the power supply negative electrode terminal of the second H bridge are consistent when the transient pulse is input to the power supply negative electrode terminal of the first H bridge so as to judge the connection state of the first H bridge and the second H bridge.
2. The H-bridge detection system according to claim 1, wherein the first H-bridge comprises a first NMOS, a second NMOS, a third NMOS, and a fourth NMOS, the drain of the first NMOS, the drain of the second NMOS being connected to the positive power supply terminal as the positive power supply terminal of the first H-bridge, the source of the first NMOS being connected to the drain of the third NMOS, the source of the second NMOS being connected to the drain of the fourth NMOS, the source of the third NMOS, the source of the fourth NMOS being connected to the negative power supply terminal of the first H-bridge.
3. The H-bridge detection system according to claim 1, wherein the second H-bridge comprises a fifth NMOS, a sixth NMOS, a seventh NMOS, and an eighth NMOS, the drain of the fifth NMOS, the drain of the sixth NMOS being connected to the positive power supply terminal as the positive power supply terminal of the second H-bridge, the source of the fifth NMOS being connected to the drain of the seventh NMOS, the source of the sixth NMOS being connected to the drain of the eighth NMOS, the source of the seventh NMOS, the source of the eighth NMOS being connected to the negative power supply terminal of the second H-bridge.
4. A detection system according to any one of claims 1 to 3, wherein the potential comparison circuit comprises a potential comparator, and the non-ground terminal of the first sampling resistor and the non-ground terminal of the second sampling resistor are connected to an input terminal of the potential comparator.
5. The H-bridge detection system according to claim 4, wherein the potential comparison circuit further comprises a single-chip microcomputer and a detection result prompting unit, the output end of the potential comparator is connected with the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is connected with the input end of the detection result prompting unit.
6. The H-bridge detection system according to claim 5, wherein the detection result prompting unit is an indicator light and/or a voice output unit and/or a display unit.
7. The H-bridge detection system according to claim 4, wherein the potential comparator outputs a high level signal when the voltages at the power supply negative terminal of the first H-bridge and the power supply negative terminal of the second H-bridge are equal, the first H-bridge and the second H-bridge being applied in parallel; when the electric potentials of the power supply negative electrode end of the first H bridge and the electric potential of the power supply negative electrode end of the second H bridge are unequal, the electric potential comparator outputs a low-level signal, and the first H bridge and the second H bridge are applied in non-parallel.
8. A method for detecting an H-bridge, which is applied to the H-bridge detection system as claimed in any one of claims 1 to 7, comprising the steps of,
generating an instantaneous pulse by using a pulse generating circuit and inputting the instantaneous pulse into a power supply negative end of the first H bridge;
when the transient pulse is input to the power supply negative terminal of the first H bridge, a potential comparison circuit is used for detecting whether the potentials of the power supply negative terminal of the first H bridge and the power supply negative terminal of the second H bridge are consistent or not so as to judge the connection state of the first H bridge and the second H bridge.
9. The H-bridge detection method according to claim 8, wherein the potential comparison circuit outputs a high-level signal when the voltages at the power supply negative terminal of the first H-bridge and the power supply negative terminal of the second H-bridge are equal, the first H-bridge and the second H-bridge being applied in parallel; when the electric potentials of the power supply negative electrode terminal of the first H bridge and the power supply negative electrode terminal of the second H bridge are unequal, the electric potential comparison circuit outputs a low-level signal, and the first H bridge and the second H bridge are applied in non-parallel.
10. The H-bridge detection method according to claim 8 or 9, characterized in that the H-bridge detection method further comprises the steps of:
and outputting a judging result.
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| CN201711180446.7A CN107861019B (en) | 2017-11-23 | 2017-11-23 | H-bridge detection system and detection method |
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| CN201711180446.7A CN107861019B (en) | 2017-11-23 | 2017-11-23 | H-bridge detection system and detection method |
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| CN109596875B (en) * | 2018-12-04 | 2023-08-18 | 国网湖北省电力有限公司电力科学研究院 | Method and device for detecting waveform abnormality of output voltage of H-bridge power unit |
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