CN116960891A - Short-circuit protection circuit of vibrating table - Google Patents
Short-circuit protection circuit of vibrating table Download PDFInfo
- Publication number
- CN116960891A CN116960891A CN202310945416.XA CN202310945416A CN116960891A CN 116960891 A CN116960891 A CN 116960891A CN 202310945416 A CN202310945416 A CN 202310945416A CN 116960891 A CN116960891 A CN 116960891A
- Authority
- CN
- China
- Prior art keywords
- circuit
- electrically connected
- short
- operational amplifier
- resistor
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 31
- 230000005669 field effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- 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
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The embodiment of the invention discloses a short-circuit protection circuit of a vibrating table, wherein a first contact is electrically connected with a first input end of a short-circuit judging circuit, a second contact is electrically connected with a second input end of the short-circuit judging circuit, the short-circuit judging circuit is used for outputting a first level signal when the first contact is contacted with the second contact, the voltage of the first level signal is larger than that of the second level signal, a level holding circuit is used for holding the level signal output by the short-circuit judging circuit, a control end of an analog switch circuit is electrically connected with an output end of the level holding circuit, an input end of the analog switch circuit is electrically connected with an input end of a power module, and an output end of the analog switch circuit is electrically connected with an output end of the power module.
Description
Technical Field
The invention relates to the technical field of electronic information, in particular to a short-circuit protection circuit of a vibrating table.
Background
The vibrating table is used for simulating the environments of various forces encountered by products in various stages of transportation, use and the like, is used for identifying whether the products have the capacity of tolerating environmental vibration, and is suitable for various industries of electronics, electromechanics, transportation means and the like.
The vibration table is generally driven by electricity, when the voltage or the current is overlarge, the table body of the vibration table and the internal mechanical structure of the vibration table can continuously collide, namely, the vibration table is separated and circularly reciprocated after collision, so that the vibration table can be damaged, the service life is reduced, the table body of the vibration table and the internal mechanical structure of the vibration table are in short touch, the vibration table can be separated after touch, short circuit can occur during the collision, and then when the current of the vibration table is overlarge, the level signal at the touch position is continuously changed, whether the vibration table is touched cannot be accurately judged, and the power supply cannot be cut off when the vibration table is touched in time.
Disclosure of Invention
The invention provides a short-circuit protection circuit of a vibrating table, which can keep a level signal which changes temporarily, accurately judge whether the vibrating table collides to be short-circuited, further cut off a power supply in time and improve the safety of the vibrating table.
In a first aspect, an embodiment of the present invention provides a short-circuit protection circuit for a vibrating table, including a first contact, a second contact, a short-circuit judging circuit, a level holding circuit, and an analog switch circuit; the vibrating table comprises a power supply module;
the first contact is electrically connected with a first input end of the short circuit judging circuit, the second contact is electrically connected with a second input end of the short circuit judging circuit, and the short circuit judging circuit is used for outputting a first level signal when the first contact is contacted with the second contact and outputting a second level signal when the first contact is separated from the second contact, wherein the voltage of the first level signal is larger than that of the second level signal;
the input end of the level holding circuit is electrically connected with the output end of the short circuit judging circuit, and the level holding circuit is used for holding the level signal output by the short circuit judging circuit, wherein the level signal comprises the first level signal and the second level signal;
the control end of the analog switch circuit is electrically connected with the output end of the level holding circuit, the input end of the analog switch circuit is electrically connected with the input end of the power module, the output end of the analog switch circuit is electrically connected with the output end of the power module, and the analog switch circuit is used for controlling the on and off of the power module according to the level signal output by the level holding circuit.
Optionally, the short circuit judging circuit includes a first triode and a second triode;
the emitter of the first triode is electrically connected with the first contact and the first power supply voltage respectively, and the base of the first triode is electrically connected with the second contact; the collector electrode of the first triode is electrically connected with the base electrode of the second triode;
the emitter of the second triode is electrically connected with the first power supply voltage, and the collector of the second triode is electrically connected with the level maintaining circuit.
Optionally, the short circuit judging circuit further includes a first capacitor, a second capacitor, a first resistor, a second resistor and a third resistor;
the emitter of the first triode is electrically connected with the first end of the first resistor, the first polar plate of the first capacitor and the first power supply voltage end respectively, the second end of the first resistor is electrically connected with the first contact, and the second polar plate of the first capacitor is electrically connected with the grounding end;
the base electrode of the first triode is electrically connected with the first end of the second resistor and the second contact, the second end of the second resistor is electrically connected with the grounding end, and the second capacitor is connected between the emitter electrode of the first triode and the base electrode of the first triode in series;
the collector of the first triode is electrically connected with the base of the second triode, the emitter of the second triode is electrically connected with the first power supply voltage end, and the collector of the second triode is electrically connected with the level holding circuit.
Optionally, the level holding circuit includes a first operational amplifier, a second operational amplifier, a first diode, a second diode, a third capacitor, and a fourth resistor;
the non-inverting input end of the first operational amplifier is electrically connected with the output end of the short circuit judging circuit, and the inverting input end of the first operational amplifier is electrically connected with the output end of the first operational amplifier through a first diode;
the non-inverting input end of the second operational amplifier is electrically connected with the output end of the first operational amplifier through a second diode, the non-inverting input end of the second operational amplifier is also electrically connected with the ground end through a third capacitor, the inverting input end of the second operational amplifier is electrically connected with the inverting input end of the first operational amplifier through a fourth resistor, and the inverting input end of the second operational amplifier is also electrically connected with the output end of the second operational amplifier;
the output end of the second operational amplifier is electrically connected with the control end of the analog switch circuit.
Optionally, the analog switch circuit includes a first transistor and a third operational amplifier;
the grid electrode of the first transistor is electrically connected with the output end of the level holding circuit, the drain electrode of the first transistor is electrically connected with the input end of the power supply module, the source electrode of the first transistor is respectively electrically connected with the inverting input end of the third operational amplifier and the output end of the power supply module, the non-inverting input end of the third operational amplifier is electrically connected with the grounding end, and the output end of the third operational amplifier is electrically connected with the output end of the power supply module.
Optionally, the analog switch circuit further includes a resistance matching circuit, and the resistance matching circuit is disposed in a circuit between the inverting input terminal of the third operational amplifier and the output terminal of the third operational amplifier;
the resistor matching circuit comprises a second transistor and a fifth resistor;
the drain electrode of the second transistor is electrically connected with the inverting input end of the third operational amplifier circuit, the source electrode of the second transistor and the grid electrode of the second transistor are electrically connected with the first end of the fifth resistor, and the second end of the fifth resistor is electrically connected with the output end of the third operational amplifier circuit.
Optionally, the first transistor and the second transistor are P-channel junction field effect transistors.
Optionally, the analog switch circuit further includes a first protection circuit; the first protection circuit is positioned in a circuit between the drain electrode of the first transistor and the input end of the power supply module;
the first protection circuit comprises a sixth resistor and a third diode;
the first end of the third diode is electrically connected with the drain electrode of the first transistor and the first end of the sixth resistor respectively, the second end of the third diode is electrically connected with the grounding end, and the second end of the sixth resistor is electrically connected with the input end of the power module.
Optionally, the short-circuit protection circuit further comprises a second protection circuit; the second protection circuit is arranged in a circuit between the short circuit judging circuit and the level holding circuit;
the second protection circuit comprises a fourth diode;
the first end of the fourth diode is electrically connected with the short circuit judging circuit, and the second end of the fourth diode is electrically connected with the level holding circuit.
Optionally, the short-circuit protection circuit further includes a first current limiting circuit, and the first current limiting circuit is disposed in a circuit between the level holding circuit and the analog switching circuit;
the first current limiting circuit comprises a seventh resistor, a first end of the seventh resistor is electrically connected with the output end of the level holding circuit, and a second end of the seventh resistor is electrically connected with the input end of the analog switching circuit.
The short-circuit protection circuit of the vibrating table comprises a first contact, a second contact, a short-circuit judging circuit, a level holding circuit and an analog switch circuit, and the vibrating table comprises a power supply module. The first contact is electrically connected with the first input end of the short circuit judging circuit, the second contact is electrically connected with the second input end of the short circuit judging circuit, and the short circuit judging circuit is used for outputting a first level signal when the first contact is contacted with the second contact and outputting a second level signal when the first contact is separated from the second contact, wherein the voltage of the first level signal is larger than that of the second level signal. The input end of the level holding circuit is electrically connected with the output end of the short circuit judging circuit, and the level holding circuit is used for holding the level signal output by the short circuit judging circuit, wherein the level signal comprises a first level signal and a second level signal. The control end of the analog switch circuit is electrically connected with the output end of the level holding circuit, the input end of the analog switch circuit is electrically connected with the input end of the power module, the output end of the analog switch circuit is electrically connected with the output end of the power module, and the analog switch circuit is used for controlling the on and off of the power module according to the level signal output by the level holding circuit, so that the level signal which changes temporarily can be held by the level holding circuit, and whether the vibration table is collided to be short-circuited can be accurately judged when the current of the vibration table is overlarge and the level signal at the touch position changes continuously, and then the power module is timely cut off by the analog switch circuit, so that the safety of the vibration table is ensured, and the service life of the vibration table is prolonged.
Drawings
Fig. 1 is a block diagram of a short-circuit protection circuit of a vibrating table according to an embodiment of the present invention;
fig. 2 is a specific circuit diagram of a short-circuit protection circuit of a vibrating table according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be fully described below by way of specific embodiments with reference to the accompanying drawings in the examples of the present invention. It is apparent that the described embodiments are some, but not all, embodiments of the present invention, and that all other embodiments, which a person of ordinary skill in the art would obtain without making inventive efforts, are within the scope of this invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a block diagram of a short-circuit protection circuit of a vibrating table according to an embodiment of the present invention, and as shown in fig. 1, the short-circuit protection circuit includes a first contact 10, a second contact 20, a short-circuit judging circuit 30, a level holding circuit 40, and an analog switch circuit 50, and the vibrating table includes a power module 60. The first contact 10 is electrically connected to a first input terminal of the short circuit determination circuit 30, the second contact 20 is electrically connected to a second input terminal of the short circuit determination circuit 30, and the short circuit determination circuit 30 is configured to output a first level signal when the first contact 10 contacts the second contact 20, and output a second level signal when the first contact 10 is separated from the second contact 20, wherein a voltage of the first level signal is greater than a voltage of the second level signal. The input end of the level holding circuit 40 is electrically connected to the output end of the short circuit judging circuit 30, and the level holding circuit 40 is used for holding the level signal output by the short circuit judging circuit 30, wherein the level signal comprises a first level signal and a second level signal. The control end of the analog switch circuit 50 is electrically connected with the output end of the level holding circuit 40, the input end of the analog switch circuit 50 is electrically connected with the input end of the power module 60, the output end of the analog switch circuit 50 is electrically connected with the output end of the power module 60, and the analog switch circuit 50 is used for controlling the on and off of the power module 60 according to the level signal output by the level holding circuit 40.
Specifically, as shown in fig. 1, the short-circuit protection circuit includes a first contact 10, a second contact 20, a short-circuit judgment circuit 30, a level holding circuit 40, and an analog switch circuit 50, and the vibrating table includes a power supply module 60. The vibrating table also includes a mechanical structure located inside the vibrating table and a table body located outside the vibrating table. The power module 60 is used for providing power to the vibrating table, and the vibrating table is usually driven by electricity, when the voltage or current of the vibrating table is too large, the mechanical structure inside the vibrating table and the table body outside the vibrating table may be caused to collide and short continuously, so that the vibrating table is damaged and the service life of the vibrating table is reduced. The short protection circuit further comprises a first contact 10 and a second contact 20. Wherein the first contact 10 may be located on the mechanical structure and the second contact 20 may be located on the table body, and when the mechanical structure collides with the table body, the first contact 10 and the second contact 20 are briefly contacted and separated so as to be cyclically reciprocated. The first input end of the short circuit judging circuit 30 is electrically connected with the first contact 10, the second input end of the short circuit judging circuit 30 is electrically connected with the second contact 20, and the short circuit judging circuit 30 is used for judging whether the first contact 10 and the second contact 20 are in contact or not and outputting different level signals. Specifically, when the first contact 10 and the second contact 20 are in contact, the first contact 10 and the second contact 20 are short-circuited, and the short-circuit determination circuit 30 outputs a first level signal, which is a high level signal; when the first contact 10 and the second contact 20 are separated, the vibrating table operates normally, and the short circuit determination circuit 30 outputs a second level signal, which is a low level signal.
Because, when the voltage or current of the vibrating table is too large, the mechanical structure inside the vibrating table is continuously collided with the table body outside the vibrating table, that is, the contact between the first contact 10 and the second contact 20 is short-circuited only when in contact, and the level signal between the two contacts is continuously changed, so that whether the vibrating table is touched cannot be accurately judged. The output terminal of the short circuit determination circuit 30 is further electrically connected to the input terminal of the level holding circuit 40. The level holding circuit 40 holds the level signal output from the short-circuit determination circuit 30 without change. The output terminal of the level holding circuit 40 is electrically connected to the control terminal of the analog switching circuit 50, the input terminal of the analog switching circuit 50 is electrically connected to the input terminal of the power supply module 60, and the output terminal of the analog switching circuit 50 is electrically connected to the output terminal of the power supply module 60. Further, in the case where the vibration table is operating normally, the first contact 10 and the second contact 20 are separated, the short circuit determination circuit 30 outputs a low level signal, the level holding circuit 40 holds and outputs the low level signal output from the short circuit determination circuit 30 to the control terminal of the analog switch circuit 50, the control terminal of the analog switch circuit 50 is turned on under the low level signal, and the input terminal of the power module 60 and the output terminal of the power module 60 are in the on state. When the voltage or current of the vibration table is too large, the first contact 10 and the second contact 20 are in short contact, the short circuit judging circuit 30 outputs a high-level signal, the level holding circuit 40 holds the high-level signal output by the short circuit judging circuit 30, even if the first contact 10 and the second contact 20 are separated from the short circuit state, the level holding circuit 40 outputs a still high-level signal, the control end of the analog switch circuit 50 is cut off under the high-level signal, and the input end of the power module 60 and the output end of the power module are in an off state, so that the power module is cut off, the safety of the vibration table is ensured, and the service life of the vibration table is prolonged.
In summary, the embodiment of the invention sets the short-circuit protection circuit of the vibrating table, which comprises a first contact, a second contact, a short-circuit judging circuit, a level holding circuit and an analog switch circuit, and the vibrating table comprises a power supply module. The first contact is electrically connected with the first input end of the short circuit judging circuit, the second contact is electrically connected with the second input end of the short circuit judging circuit, and the short circuit judging circuit is used for outputting a first level signal when the first contact is contacted with the second contact and outputting a second level signal when the first contact is separated from the second contact, wherein the voltage of the first level signal is larger than that of the second level signal. The input end of the level holding circuit is electrically connected with the output end of the short circuit judging circuit, and the level holding circuit is used for holding the level signal output by the short circuit judging circuit, wherein the level signal comprises a first level signal and a second level signal. The control end of the analog switch circuit is electrically connected with the output end of the level holding circuit, the input end of the analog switch circuit is electrically connected with the input end of the power module, the output end of the analog switch circuit is electrically connected with the output end of the power module, and the analog switch circuit is used for controlling the on and off of the power module according to the level signal output by the level holding circuit, so that the level signal which changes temporarily can be held by the level holding circuit, and whether the vibration table collides to be short-circuited can be accurately judged when the level signal at the contact position is continuously changed due to overlarge current of the vibration table, and then the power module is timely cut off by the analog switch circuit, so that the safety of the vibration table is ensured, and the service life of the vibration table is prolonged.
Optionally, fig. 2 is a specific circuit diagram of a short-circuit protection circuit of a vibrating table according to an embodiment of the present invention. As shown in fig. 2, the short circuit determination circuit 30 includes a first transistor Q1 and a second transistor Q2. The emitter of the first triode Q1 is electrically connected with the first contact 10 and the first power supply voltage +V respectively, the base electrode of the first triode Q1 is electrically connected with the second contact 20, and the collector electrode of the first triode Q1 is electrically connected with the base electrode of the second triode Q2. The emitter of the second transistor Q2 is electrically connected to the first power supply voltage +v, and the collector of the second transistor Q2 is electrically connected to the level holding circuit 40.
Specifically, the emitter of the first triode Q1 is electrically connected to the first contact 10 and the first power supply voltage +v, respectively, and the base of the first triode Q1 is electrically connected to the second contact 20. Normally, the first contact 10 and the second contact 20 are in a separated state, that is, the first contact 10 and the second contact 20 are disconnected, the first contact 10 is connected with the emitter of the first triode Q1, the second contact 20 is connected with the base of the second triode Q2, the first triode Q1 is conducted, the collector of the first triode Q1 outputs a first power supply voltage to the base of the second triode Q2, the emitter of the second triode Q2 is connected with the first power supply voltage +v, the second triode Q2 is turned off, and the short circuit judging circuit 30 outputs a low level signal. When the first contact 10 contacts with the second contact 20, i.e. the first contact 10 and the second contact 20 are in short circuit, the first power voltage terminal v+ reaches the base of the first triode Q1 through the first contact 10 and the second contact 20, the first triode is turned off, so that the base of the second triode Q2 is electrically connected with the ground GND, and the emitter of the second triode Q2 is electrically connected with the first power voltage terminal +v, so that the second triode Q2 is turned on, the collector of the second triode Q2 outputs the first power voltage, i.e. the short circuit judging circuit 30 outputs a high level signal. That is, when the first contact 10 is separated from the second contact 20, the first transistor Q1 is turned on, the second transistor Q2 is turned off, and the short circuit determination circuit 30 outputs a low level signal; when the first contact 10 contacts the second contact 20, the first transistor Q1 is turned off, the second transistor Q2 is turned on, and the short circuit judging circuit 30 outputs a high level signal, so that the judging rate of judging whether the first contact 10 contacts the second contact 20 can be increased by judging whether the first contact 10 contacts the second contact 20 through the first transistor Q2 and the second transistor Q2 and outputting different level signals.
On the basis of the above embodiment, with continued reference to fig. 2, the short-circuit determination circuit 30 further includes a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, and a third resistor R3. The emitter of the first triode Q1 is electrically connected with the first end of the first resistor R1, the first polar plate of the first capacitor C1 and the first power supply voltage end +V respectively, the second end of the first resistor R1 is electrically connected with the first contact 10, and the second polar plate of the first capacitor C1 is electrically connected with the grounding end GND. The base of the first triode Q1 is electrically connected with the first end of the second resistor R2 and the second contact 20 respectively, the second end of the second resistor R2 is electrically connected with the ground end GND, the second capacitor C2 is connected between the emitter of the first triode Q1 and the base of the first triode Q1 in series, the collector of the first triode Q1 is electrically connected with the base of the second triode Q2, the emitter of the second triode Q2 is electrically connected with the first power supply voltage end +V, and the collector of the second triode Q2 is electrically connected with the level holding circuit 40.
Specifically, a first resistor R1 is connected in series between the emitter of the first triode Q1 and the first contact 10, and the current in the circuit is limited by the first resistor R1 to protect the circuit. In addition, a second capacitor C2 is further connected in parallel between the emitter and the base of the first triode Q1, when the first contact 10 is separated from the second contact 20, the second capacitor C2 is equivalent to open circuit, when the first contact 10 is contacted with the second contact 20, the first power voltage output by the first power voltage terminal +v passes through the first resistor R1, the second capacitor C2 reaches the base of the first triode Q1, the first triode Q1 is turned off, the base of the second triode Q2 is equivalent to be directly electrically connected with the ground terminal through the third resistor R3, and as the emitter of the second triode Q2 is electrically connected with the first power voltage terminal +v, the second triode Q2 is turned on, and the collector of the second triode Q2 outputs the first power voltage, i.e., a high level signal. The emitter of the first triode Q1 is further electrically connected with the ground end GND through the first capacitor C1, and the first triode Q1 is further protected through the first capacitor C1, so that the first resistor R1, the second resistor R2 and the third resistor R3 are arranged among circuits to conduct current limiting, and in addition, the triode is further protected through the first capacitor C1 and the second capacitor C2, and the safety and the reliability of the circuit are improved.
Optionally, with continued reference to fig. 2, the level holding circuit 40 includes a first operational amplifier U1, a second operational amplifier U2, a first diode D1, a second diode D2, a third capacitor C3, and a fourth resistor R4, where a non-inverting input terminal of the first operational amplifier U1 is electrically connected to the output terminal of the short circuit judging circuit 30, and an inverting input terminal of the first operational amplifier U1 is electrically connected to the output terminal of the first operational amplifier U1 through the first diode D1. The non-inverting input terminal of the second operational amplifier U2 is electrically connected to the output terminal of the first operational amplifier U1 through the second diode D2, the non-inverting input terminal of the second operational amplifier U2 is also electrically connected to the ground terminal GND through the third capacitor C3, the inverting input terminal of the second operational amplifier U2 is electrically connected to the inverting input terminal of the first operational amplifier U1 through the fourth resistor R4, and the inverting input terminal of the second operational amplifier U2 is also electrically connected to the output terminal of the second operational amplifier U2, and the output terminal of the second operational amplifier U2 is electrically connected to the control terminal of the analog switch circuit 50.
Specifically, when the short circuit determining circuit 30 determines that the first contact 10 is in contact with the second contact 20 and outputs a high level signal, the high level signal is transmitted to the non-inverting input terminal of the first operational amplifier U1, and the inverting input terminal of the first operational amplifier U1 is connected to the output terminal of the first operational amplifier U1 through the first diode D1, so that the signal at the inverting input terminal of the first operational amplifier U1 can be unidirectionally transmitted to the output terminal of the first operational amplifier U1, and the signal at the output terminal of the first operational amplifier U1 cannot be transmitted to the inverting input terminal of the first operational amplifier U1. The output end of the first operational amplifier U1 is also electrically connected with the in-phase input end of the second operational amplifier U2 through the second triode D2, a third capacitor C3 is further arranged between the second triode D2 and the in-phase input end of the second operational amplifier U2, and then the high-level signal output by the first operational amplifier U1 is charged in one direction through the second triode D2, so that the third capacitor C3 can store the high-level signal recently output by the first operational amplifier U1, even if the vibration table is separated from a short circuit state in the vibration process, the level signal can be kept unchanged, that is, when the short circuit judging circuit 30 outputs the low-level signal to the first operational amplifier U1, the third capacitor C3 can still provide the nearest high-level signal to the second operational amplifier U2, so that the second operational amplifier U2 outputs the stable high-level signal. In addition, the inverting input end of the first operational amplifier U1 is electrically connected with the inverting input end of the second operational amplifier U2 through the fourth resistor R4, and the inverting input end of the first operational amplifier U1 and the inverting input end of the second operational amplifier U2 are electrically connected with the output end of the second operational amplifier U2, and the circuit is protected through the fourth resistor R4, so that the reliability of the circuit is improved.
In yet another embodiment, with continued reference to fig. 2, the analog switching circuit 50 includes a first transistor M1 and a third operational amplifier U3. The gate of the first transistor M1 is electrically connected to the output terminal of the level holding circuit 40, the drain of the first transistor M1 is electrically connected to the input terminal VI of the power module 60, the source of the first transistor M1 is electrically connected to the inverting input terminal of the third operational amplifier U3 and the output terminal VO of the power module 60, the non-inverting input terminal of the third operational amplifier U3 is electrically connected to the ground terminal GND, and the output terminal of the third operational amplifier U3 is electrically connected to the output terminal VO of the power module 60.
Specifically, the analog switch circuit 50 includes a first transistor M1 and a third operational amplifier U3, where a gate of the first transistor M1 is electrically connected to an output terminal of the second operational amplifier U2, and a drain of the first transistor M1 is electrically connected to an input terminal VI of the power module 60. When the vibration table normally works, the first contact 10 and the second contact 20 are separated, the short circuit judging circuit 30 outputs a low level signal to the level holding circuit 40, the level holding circuit 40 holds the low level signal output by the short circuit judging circuit 30 and outputs the low level signal to the gate of the first transistor M1, and since the source of the first transistor M1 is electrically connected with the inverting input terminal of the third operational amplifier U3 and the output terminal VO of the power supply module 60, the non-inverting input terminal of the third operational amplifier U3 is electrically connected with the ground terminal GND, and as known from the virtual ground characteristic, the non-inverting input terminal of the third amplifier U3 is electrically connected with the ground terminal GND, and the potential of the inverting input terminal of the third amplifier U3 is zero. When the gate of the first transistor M1 is a low level signal and the source is at zero potential, the first transistor M1 is turned on, so that the input terminal VI and the output terminal VO of the power module 60 are turned on, and the oscillating table operates normally. When the first contact 10 and the second contact 20 are in contact, the short circuit determination circuit 30 outputs a high level signal to the level holding circuit 40, the level holding circuit 40 holds the high level signal output from the short circuit determination circuit 30 and outputs the high level signal to the gate of the first transistor M1, and since the source of the first transistor M1 is electrically connected to the inverting input terminal of the third operational amplifier U3 and the output terminal VO of the power supply module 60, the non-inverting input terminal of the third operational amplifier U3 is electrically connected to the ground terminal GND, and as is known from the virtual ground characteristic, the non-inverting input terminal of the third amplifier U3 is electrically connected to the ground terminal GND, and the potential of the inverting input terminal of the third amplifier U3 is zero. When the gate of the first transistor M1 is a high level signal and the source is at zero potential, the first transistor M1 is turned off, so that the input terminal VI and the output terminal VO of the power module 60 are disconnected, and the analog switch circuit 50 cuts off the power module 60, thereby improving the safety of the vibrating table.
Optionally, with continued reference to fig. 2, the analog switch circuit 50 further includes a resistance matching circuit 510, the resistance matching circuit 510 being disposed in the circuit between the inverting input of the third operational amplifier U3 and the output of the third operational amplifier U3. The resistor matching circuit 510 includes a second transistor M2 and a fifth resistor R5, where a drain of the second transistor M2 is electrically connected to an inverting input terminal of the third operational amplifier circuit U3, a source of the second transistor M2 and a gate of the second transistor M2 are both electrically connected to a first terminal of the fifth resistor R5, and a second terminal of the fifth resistor R5 is electrically connected to an output terminal of the third operational amplifier U3. Specifically, the second transistor M2 and the fifth resistor R5 are disposed at the feedback end of the third operational amplifier U3, that is, in a circuit between the inverting input end of the third operational amplifier U3 and the output end of the third operational amplifier U3, the drain electrode of the second transistor M2 is electrically connected to the inverting input end of the third operational amplifier U3, the source electrode of the second transistor M2 and the gate electrode of the second transistor M2 are both electrically connected to the first end of the fifth resistor R5, and since the source electrode and the gate electrode of the second transistor M2 are connected to the same node, the second transistor M2 is in a continuous on state, and then the on-resistance of the first transistor M1 is matched through the second transistor M2, so as to improve the reliability of the analog switch circuit 50.
Optionally, the first transistor M1 and the second transistor M2 are P-channel junction field effect transistors. A junction field effect transistor is a field effect transistor having a three terminal semiconductor, and is a voltage controlled device controlled by using a reverse bias voltage to the gate. When no voltage exists between the grid electrode and the source electrode pin, the junction field effect transistor is conducted, and the junction field effect transistor has the characteristics of higher mobility and lower noise. Furthermore, the embodiment of the invention can ensure that the control mode of the circuit is simple and convenient by arranging the first transistor M1 and the second transistor M2 to be P-channel junction field effect transistors.
Optionally, with continued reference to fig. 2, the analog switch circuit 50 further includes a first protection circuit 520, where the first protection circuit 520 is located in a circuit between the drain of the first transistor M1 and the input terminal VI of the power module 60, the first protection circuit 520 includes a sixth resistor R6 and a third diode D3, a first terminal of the third diode D3 is electrically connected to the drain of the first transistor M1 and a first terminal of the sixth resistor R6, a second terminal of the third diode D3 is electrically connected to the ground terminal GND, and a second terminal of the sixth resistor R6 is electrically connected to the input terminal VI of the power module 60. Specifically, the sixth resistor R6 is connected in series between the drain of the first transistor M1 and the input terminal VI of the power module 60, and the circuit is protected by limiting current through the sixth resistor R6, and in addition, the drain of the first transistor M1 is electrically connected to the ground terminal GND through the third diode D3, so that the circuit is protected through the third diode D3, thereby improving the safety and reliability of the circuit.
Optionally, with continued reference to fig. 2, the short-circuit protection circuit further includes a second protection circuit 70, the second protection circuit 70 being disposed in a circuit between the short-circuit determination circuit 30 and the level holding circuit 40. The second protection circuit 70 includes a fourth diode D4, a first end of the fourth diode D4 is electrically connected to the short circuit determination circuit 30, and a second end of the fourth diode D4 is electrically connected to the level holding circuit 40. Specifically, the fourth diode D4 is disposed in a circuit between the short circuit determining circuit 30 and the level holding circuit 40, so that the level signal output by the short circuit determining circuit 30 can be unidirectionally transmitted to the level holding circuit 40, thereby preventing a reaction and ensuring the safety and reliability of the circuit.
Optionally, with continued reference to fig. 2, the short-circuit protection circuit further includes a first current limiting circuit 80, where the first current limiting circuit 80 is disposed in a circuit between the level keeping circuit 40 and the analog switching circuit 50, the first current limiting circuit 80 includes a seventh resistor R7, a first end of the seventh resistor R7 is electrically connected to an output terminal of the level keeping circuit 40, and a second end of the seventh resistor R7 is electrically connected to an input terminal of the analog switching circuit 50. Specifically, a seventh resistor R7 is further disposed between the level holding circuit 40 and the analog switch circuit 50, that is, a first end of the seventh resistor R7 is electrically connected to the output end of the second operational amplifier U2, and a second end of the seventh resistor R7 is electrically connected to the gate of the first transistor M1, so that current is limited by the seventh resistor R7, thereby ensuring safety and reliability of the circuit.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. The short-circuit protection circuit of the vibrating table is characterized by comprising a first contact, a second contact, a short-circuit judging circuit, a level holding circuit and an analog switch circuit; the vibrating table comprises a power supply module;
the first contact is electrically connected with a first input end of the short circuit judging circuit, the second contact is electrically connected with a second input end of the short circuit judging circuit, and the short circuit judging circuit is used for outputting a first level signal when the first contact is contacted with the second contact and outputting a second level signal when the first contact is separated from the second contact, wherein the voltage of the first level signal is larger than that of the second level signal;
the input end of the level holding circuit is electrically connected with the output end of the short circuit judging circuit, and the level holding circuit is used for holding the level signal output by the short circuit judging circuit, wherein the level signal comprises the first level signal and the second level signal;
the control end of the analog switch circuit is electrically connected with the output end of the level holding circuit, the input end of the analog switch circuit is electrically connected with the input end of the power module, the output end of the analog switch circuit is electrically connected with the output end of the power module, and the analog switch circuit is used for controlling the on and off of the power module according to the level signal output by the level holding circuit.
2. The short-circuit protection circuit according to claim 1, wherein the short-circuit judging circuit includes a first transistor and a second transistor;
the emitter of the first triode is electrically connected with the first contact and the first power supply voltage respectively, and the base of the first triode is electrically connected with the second contact; the collector electrode of the first triode is electrically connected with the base electrode of the second triode;
the emitter of the second triode is electrically connected with the first power supply voltage, and the collector of the second triode is electrically connected with the level maintaining circuit.
3. The short-circuit protection circuit according to claim 2, wherein the short-circuit judging circuit further comprises a first capacitor, a second capacitor, a first resistor, a second resistor, and a third resistor;
the emitter of the first triode is electrically connected with the first end of the first resistor, the first polar plate of the first capacitor and the first power supply voltage end respectively, the second end of the first resistor is electrically connected with the first contact, and the second polar plate of the first capacitor is electrically connected with the grounding end;
the base electrode of the first triode is electrically connected with the first end of the second resistor and the second contact, the second end of the second resistor is electrically connected with the grounding end, and the second capacitor is connected between the emitter electrode of the first triode and the base electrode of the first triode in series;
the collector of the first triode is electrically connected with the base of the second triode, the emitter of the second triode is electrically connected with the first power supply voltage end, and the collector of the second triode is electrically connected with the level holding circuit.
4. The short-circuit protection circuit according to claim 1, wherein the level holding circuit includes a first operational amplifier, a second operational amplifier, a first diode, a second diode, a third capacitor, and a fourth resistor;
the non-inverting input end of the first operational amplifier is electrically connected with the output end of the short circuit judging circuit, and the inverting input end of the first operational amplifier is electrically connected with the output end of the first operational amplifier through a first diode;
the non-inverting input end of the second operational amplifier is electrically connected with the output end of the first operational amplifier through a second diode, the non-inverting input end of the second operational amplifier is also electrically connected with the ground end through a third capacitor, the inverting input end of the second operational amplifier is electrically connected with the inverting input end of the first operational amplifier through a fourth resistor, and the inverting input end of the second operational amplifier is also electrically connected with the output end of the second operational amplifier;
the output end of the second operational amplifier is electrically connected with the control end of the analog switch circuit.
5. The short-circuit protection circuit of claim 1, wherein the analog switching circuit comprises a first transistor and a third operational amplifier;
the grid electrode of the first transistor is electrically connected with the output end of the level holding circuit, the drain electrode of the first transistor is electrically connected with the input end of the power supply module, the source electrode of the first transistor is respectively electrically connected with the inverting input end of the third operational amplifier and the output end of the power supply module, the non-inverting input end of the third operational amplifier is electrically connected with the grounding end, and the output end of the third operational amplifier is electrically connected with the output end of the power supply module.
6. The short-circuit protection circuit according to claim 5, wherein the analog switch circuit further comprises a resistance matching circuit provided in a circuit between an inverting input terminal of the third operational amplifier and an output terminal of the third operational amplifier;
the resistor matching circuit comprises a second transistor and a fifth resistor;
the drain electrode of the second transistor is electrically connected with the inverting input end of the third operational amplifier circuit, the source electrode of the second transistor and the grid electrode of the second transistor are electrically connected with the first end of the fifth resistor, and the second end of the fifth resistor is electrically connected with the output end of the third operational amplifier circuit.
7. The short circuit protection circuit of claim 6, wherein the first transistor and the second transistor are both P-channel junction field effect transistors.
8. The short-circuit protection circuit of claim 5, wherein the analog switch circuit further comprises a first protection circuit; the first protection circuit is positioned in a circuit between the drain electrode of the first transistor and the input end of the power supply module;
the first protection circuit comprises a sixth resistor and a third diode;
the first end of the third diode is electrically connected with the drain electrode of the first transistor and the first end of the sixth resistor respectively, the second end of the third diode is electrically connected with the grounding end, and the second end of the sixth resistor is electrically connected with the input end of the power module.
9. The short-circuit protection circuit of claim 1, further comprising a second protection circuit; the second protection circuit is arranged in a circuit between the short circuit judging circuit and the level holding circuit;
the second protection circuit comprises a fourth diode;
the first end of the fourth diode is electrically connected with the short circuit judging circuit, and the second end of the fourth diode is electrically connected with the level holding circuit.
10. The short-circuit protection circuit according to claim 1, further comprising a first current limiting circuit provided in a circuit between the level holding circuit and the analog switching circuit;
the first current limiting circuit comprises a seventh resistor, a first end of the seventh resistor is electrically connected with the output end of the level holding circuit, and a second end of the seventh resistor is electrically connected with the input end of the analog switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310945416.XA CN116960891B (en) | 2023-07-31 | 2023-07-31 | Short-circuit protection circuit of vibrating table |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310945416.XA CN116960891B (en) | 2023-07-31 | 2023-07-31 | Short-circuit protection circuit of vibrating table |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116960891A true CN116960891A (en) | 2023-10-27 |
| CN116960891B CN116960891B (en) | 2024-08-20 |
Family
ID=88442459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310945416.XA Active CN116960891B (en) | 2023-07-31 | 2023-07-31 | Short-circuit protection circuit of vibrating table |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116960891B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118449259A (en) * | 2024-07-05 | 2024-08-06 | 北京博科测试系统股份有限公司 | Hydraulic and electric vibration table controller with standby battery |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281087A (en) * | 2008-05-13 | 2008-10-08 | 苏州试验仪器总厂 | Dynamoelectric oscillating table excitation voltage automatic adjusting method |
| KR20130055499A (en) * | 2011-11-18 | 2013-05-28 | 리치테크 테크놀로지 코포레이션 | Short-circuit detection circuit and short-circuit detection method |
| CN205407214U (en) * | 2016-02-24 | 2016-07-27 | 中国兵器工业集团第二一四研究所苏州研发中心 | Drive current foldback circuit with function is swung in antivibration |
| CN107895934A (en) * | 2017-12-26 | 2018-04-10 | 珠海市茂亦生物科技有限公司 | A kind of centrifuge vibrations protection circuit and its micro centrifuge |
| CN109103851A (en) * | 2018-10-29 | 2018-12-28 | 安徽云森物联网科技有限公司 | A kind of power interface protective device |
| CN115016430A (en) * | 2022-05-30 | 2022-09-06 | 湖南盈晟电子科技有限公司 | Online prejudgment protection method of novel vibration control system |
-
2023
- 2023-07-31 CN CN202310945416.XA patent/CN116960891B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281087A (en) * | 2008-05-13 | 2008-10-08 | 苏州试验仪器总厂 | Dynamoelectric oscillating table excitation voltage automatic adjusting method |
| KR20130055499A (en) * | 2011-11-18 | 2013-05-28 | 리치테크 테크놀로지 코포레이션 | Short-circuit detection circuit and short-circuit detection method |
| CN205407214U (en) * | 2016-02-24 | 2016-07-27 | 中国兵器工业集团第二一四研究所苏州研发中心 | Drive current foldback circuit with function is swung in antivibration |
| CN107895934A (en) * | 2017-12-26 | 2018-04-10 | 珠海市茂亦生物科技有限公司 | A kind of centrifuge vibrations protection circuit and its micro centrifuge |
| CN109103851A (en) * | 2018-10-29 | 2018-12-28 | 安徽云森物联网科技有限公司 | A kind of power interface protective device |
| CN115016430A (en) * | 2022-05-30 | 2022-09-06 | 湖南盈晟电子科技有限公司 | Online prejudgment protection method of novel vibration control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118449259A (en) * | 2024-07-05 | 2024-08-06 | 北京博科测试系统股份有限公司 | Hydraulic and electric vibration table controller with standby battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116960891B (en) | 2024-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN116960891B (en) | Short-circuit protection circuit of vibrating table | |
| US20100045117A1 (en) | Protection device for a power source and power unit using same | |
| CN1329990C (en) | Semiconductor integrated circuit device | |
| US5086364A (en) | Circuitry for detecting a short circuit of a load in series with an fet | |
| JP4838883B2 (en) | Circuit arrangement for detecting an undervoltage of an energy source | |
| CN101690052A (en) | Data transmission system and method, and electronic device having that data transmission system | |
| JP2013255017A (en) | Power pass circuit | |
| JP3678156B2 (en) | ESD protection circuit | |
| JP4091590B2 (en) | Switching circuit | |
| US10921384B2 (en) | Disconnection sensing circuit and electrical connection box | |
| JP2010193033A (en) | Overcurrent protection circuit | |
| US9148014B2 (en) | Battery protection circuit | |
| CN107894530A (en) | Negative voltage detection circuit and motor driver | |
| US8274315B2 (en) | Voltage sequence output circuit | |
| CN110176791B (en) | Power supply control device | |
| CN107147284A (en) | A kind of protection circuit and electric power system | |
| CN101557098B (en) | Motor driving circuit | |
| JP4692267B2 (en) | Current detection device and current control device | |
| CN211908761U (en) | Power semiconductor device turn-on and turn-off voltage generating circuit | |
| CN102122948B (en) | Circuit device and method for processing digital signal | |
| US11515781B2 (en) | Inverter with a current source provided with a protection circuit | |
| CN111629314B (en) | Overvoltage detection reminding system and method for vehicle-mounted loudspeaker | |
| US7221208B2 (en) | Switching circuit | |
| EP1678828B1 (en) | Switch | |
| CN106020402A (en) | Central processing unit protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |