CN108574481B - Electronic induction switch circuit, electronic induction switch system and power supply circuit - Google Patents
Electronic induction switch circuit, electronic induction switch system and power supply circuit Download PDFInfo
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- CN108574481B CN108574481B CN201710147594.2A CN201710147594A CN108574481B CN 108574481 B CN108574481 B CN 108574481B CN 201710147594 A CN201710147594 A CN 201710147594A CN 108574481 B CN108574481 B CN 108574481B
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- 230000006698 induction Effects 0.000 title claims abstract description 60
- 230000001939 inductive effect Effects 0.000 claims abstract description 58
- 238000000926 separation method Methods 0.000 claims abstract description 25
- 230000005291 magnetic effect Effects 0.000 claims description 45
- 230000005669 field effect Effects 0.000 claims description 36
- 239000003990 capacitor Substances 0.000 claims description 30
- 238000001914 filtration Methods 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 14
- 230000005294 ferromagnetic effect Effects 0.000 description 6
- 238000012790 confirmation Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/90—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of galvano-magnetic devices, e.g. Hall-effect devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0036—Means reducing energy consumption
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/945—Proximity switches
- H03K2217/95—Proximity switches using a magnetic detector
- H03K2217/954—Ferromagnetic case
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses an electronic inductive switch circuit which is used for sensing the stroke or position of a linkage switch and comprises a separation circuit, an induction circuit control circuit and a switch circuit. In order to reduce energy consumption, the induction circuit is controlled to be in a working state intermittently by the control circuit of the induction circuit, and a position sensing signal generated by detecting the movement of a magnet on the linkage switch is sent to the switch circuit when the induction circuit is in the working state, the switch circuit receives the position sensing signal to judge whether the state of the linkage switch is open or closed, the circuit structure is ingenious, and the normal work of the control guide circuit is not influenced when the induction circuit and the switch circuit are powered without additionally adding a power supply circuit.
Description
Technical Field
The invention relates to a switching device, in particular to a switching device for automobile charging.
Background
In order to respond to the requirements of energy conservation and environmental protection, electric automobiles are increasingly applied to production and life. The electric automobile adopts a battery as a power source. Therefore, the electric vehicle needs to be charged at regular use time intervals. Generally, an electric vehicle is charged by a charging gun. And the switch is an important component of the charging gun. The automobile charging switch in the prior art is often a mechanical switch, and the mechanical switch is used for realizing the on-off of the switch through direct contact, so that the mode has the defects of limited service life, low precision and the like.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a power supply and working circuit of an electromagnetic switch for automobile charging, which responds to magnetic field change, and the electromagnetic switch comprises the following specific technical scheme:
an electronic inductive switching circuit for sensing the travel or position of a ganged switch, comprising: the separation circuit receives a PWM pulse signal, wherein the PWM pulse signal comprises positive phase PWM pulses and negative phase PWM pulses, the separation circuit generates positive phase DC voltage according to the positive phase PWM pulses, and the separation circuit generates negative phase DC voltage according to the negative phase PWM pulses; the induction circuit is used for inducing the stroke or the position of the linkage switch to generate a position induction signal, and the induction circuit uses the negative-phase direct-current voltage as a working voltage; the control circuit uses the negative-phase direct-current voltage as a working voltage to control the working mode of the induction circuit so as to reduce the power consumption of the induction circuit; and the switching circuit uses the positive direct-current voltage as working voltage, receives the position sensing signal and outputs a closing or opening signal according to the received position sensing signal.
The electronic sensing switch circuit as described above, wherein the control circuit controls the operation mode of the sensing circuit to operate in a first mode and a second mode; in the first mode, the sensing circuit has a first operating current and a first operating time; in the second mode, the sensing circuit has a second operating current and a second operating time.
The electronic sensing switch circuit according to the foregoing, wherein the first mode is an operation mode, and the sensing circuit senses a stroke or a position signal of the linkage switch in the operation mode; the second mode is a standby mode, and the sensing circuit does not work in the standby mode.
The electronic inductive switching circuit of the preceding claim, wherein the first operating current is greater than the second operating current; the first working time is smaller than the second working time.
The electronic inductive switching circuit of the foregoing, the first operating current and the first operating time are 4mA and 40us, respectively; the second operating current and the second operating time are 13uA and 100ms, respectively.
The electronic inductive switching circuit of the preceding claim, the separation circuit comprising: the first rectifying circuit comprises a first resistor, a first diode and a first capacitor; a first end of the first resistor receives a PWM pulse signal, and a second end of the first resistor is connected with the anode of the first diode; the negative electrode of the first diode is connected with the first end of the first capacitor and forms a first common connection point; the second end of the first capacitor is grounded; the first common connection point is an output end of the positive direct-current voltage; the second rectifying circuit comprises a second resistor, a second diode, a second capacitor and a third diode; the first end of the second resistor receives a PWM pulse signal, and the second end of the second resistor is connected with the cathode of the second diode; the anode of the second diode is connected with the first end of the second capacitor; the second end of the second capacitor is connected with the positive electrode of the third diode, and the negative electrode of the third diode is the output end of the negative phase direct-current voltage.
The electronic inductive switch circuit as described above, wherein the first resistor, the first capacitor and the first diode form a filtering rectifying circuit.
The electronic inductive switch circuit as described above, wherein the second resistor, the second capacitor and the second diode form a filtering rectifier circuit.
The electronic inductive switching circuit of the preceding claims, the inductive circuit comprising: and the control circuit controls the working state of the Hall sensing unit.
The electronic induction switch circuit as described above, wherein the hall induction unit receives the negative-phase dc voltage output by the negative electrode of the third diode; the Hall sensing unit senses the movement of the linkage switch and generates the position sensing signal.
An electronic inductive switching circuit as claimed in the preceding claim, said switching circuit comprising: a field effect transistor; the field effect transistor comprises a grid electrode, a source electrode and a drain electrode; the grid electrode of the field effect tube is simultaneously connected with the output end of the induction circuit and the cathode of the first diode of the first rectifying circuit, and receives the position induction signal of the induction circuit and the positive direct-current voltage output by the first rectifying circuit; the source electrode of the field effect transistor is grounded; the drain electrode of the field effect tube is connected with a state indicating circuit, and the state indicating circuit is used for outputting a first state value when the field effect tube is conducted and outputting a second state value when the field effect tube is cut off.
The electronic inductive switch circuit as described above, wherein the positive dc voltage triggers a high level for the gate of the fet.
The electronic inductive switching circuit of the preceding claim, the status indication circuit comprising: a fourth resistor and a fifth resistor; the fourth resistor and the fifth resistor are connected in series; and the drain electrode of the field effect transistor is connected between the fourth resistor and the fifth resistor.
The electronic inductive switch circuit as claimed in the preceding claim, wherein the first end of the fourth resistor is connected to the first end of the fifth resistor to form a second common connection point therebetween; the second end of the fourth resistor is an output end of the state indicating circuit, and the second end of the fifth resistor is grounded; and the drain electrode of the field effect transistor is connected with a second common connection point between the fourth resistor and the fifth resistor.
The electronic induction switch circuit as described above, wherein the first state value is a resistance value of the fourth resistor; the second state value is a resistance value of the fourth resistor and the fifth resistor which are connected in series.
The electronic inductive switching circuit of the preceding claim, further comprising: a fourth diode and a fifth diode; the positive electrode of the fourth diode is connected with the first common connection point, and the negative electrode of the positive electrode of the fourth diode is connected with the grid electrode of the field effect transistor; the cathode of the fifth diode is connected between the cathode of the fourth diode and a common connection point of the grid electrode of the field effect transistor; the positive electrode of the fifth diode is grounded.
The electronic inductive switching circuit of the preceding claim, further comprising: a sixth diode for preventing voltage surge from the output end of the state indicating circuit from damaging the drain electrode of the field effect transistor; the negative electrode of the sixth diode is connected to the second end of the fourth resistor; the anode of the sixth diode is grounded.
The electronic induction switch circuit as described above, wherein the linkage switch is provided with a magnet device, and the magnet device approaches or departs from the hall induction unit along with the operation of the linkage switch; the Hall sensing unit senses the change of a magnetic field generated by the change of the stroke or the position of the magnet device, and generates the position sensing signal.
The electronic inductive switching circuit as described above, wherein the PWM pulse signal is a control pilot circuit signal from a vehicle charging plug.
The electronic inductive switching circuit of the preceding claim, wherein the duty cycles of the positive phase duty cycle signal and the negative phase duty cycle signal are complementary.
The electronic inductive switching circuit as described above, wherein the duty cycle of the normal phase PWM pulse is 13.5%; the duty cycle of the negative phase PWM pulse is 86.5%.
The electronic inductive switch circuit as described above, wherein the PWM pulse signal output of the control pilot circuit is simultaneously connected to a load on the vehicle.
Another object of the present invention is to provide an electronic inductive switching system, comprising: an electronic inductive switching circuit as hereinbefore described;
the linkage switch is movably arranged relative to the electronic induction switch circuit; the linkage switch is fixedly provided with a magnet device, and the magnet device moves along with the linkage switch and has approaching and distant positions relative to the electronic induction switch circuit; and the induction circuit is used for inducing the change of a magnetic field generated by the movement of the magnet device and generating a position induction signal.
A third object of the present invention is to provide an electrical circuit, comprising:
the separation circuit receives a PWM pulse signal, wherein the PWM pulse signal comprises positive phase PWM pulses and negative phase PWM pulses, the separation circuit generates positive phase DC voltage according to the positive phase PWM pulses, and the separation circuit generates negative phase DC voltage according to the negative phase PWM pulses; and the control circuit uses the negative-phase direct-current voltage as a working voltage to control the working mode of an induction circuit so as to reduce the power consumption of the induction circuit.
The power supply circuit as described above, wherein the control circuit sends a control signal to the sensing circuit to control the sensing circuit to operate in the first mode and the second mode; the sensing circuit receives a control signal of a first state and is in a first mode; the sensing circuit receives the control signal of the second state and is in the second mode.
The power supply circuit of the preceding claim, in the first mode, the sense circuit having a first operating current and a first operating time; in the second mode, the sensing circuit has a second operating current and a second operating time; the duration of the control signal in the first state is the first working time of the induction circuit; the duration of the control signal in the second state is the second working time of the sensing circuit.
The power supply circuit as described above, wherein the first mode is a working mode, and the sensing circuit senses a travel or position signal of the linkage switch in the working mode; the second mode is a standby mode, and the sensing circuit does not work in the standby mode.
The power supply circuit of the preceding claim, the first operating current being less than the second operating current;
the first working time is smaller than the second working time.
The power supply circuit as described above, the first operating current and the first operating time being 4mA and 40us, respectively;
the second operating current and the second operating time are 13uA and 100ms, respectively.
The invention adopts a separating circuit to absorb PWM pulse signals from a control guide circuit in a vehicle charging plug, separates positive phase PWM pulses and negative phase PWM pulses in the PWM pulse signals into positive phase direct current voltage and negative phase direct current voltage, supplies power to a switch circuit by the positive phase direct current voltage, supplies power to an induction circuit for sensing the movement of a magnet device by the negative phase direct current voltage, controls the induction circuit through an induction circuit control circuit, and enables the induction circuit to be in a working mode or a standby mode so as to reduce power consumption, and can normally sense the movement of the magnet device without influencing the normal load work of the control guide circuit. The invention adopts the electromagnetic element as the induction switch of the charging gun to replace a mechanical switch, has longer service life, can sense the switch motion change of a micro-distance, and improves the sensing precision of the switch; the electronic induction switch circuit can absorb PWM pulse signals in the control guide circuit in the charging gun as the power supply of the switch system under the condition that no additional power supply is needed, does not influence the normal operation of the control guide circuit, has great compatibility, and has anti-interference capability in a complex electromagnetic environment.
Drawings
FIG. 1 is a schematic diagram of a mechanical layout of an electronic switch according to the present invention;
FIG. 2 is a schematic diagram of the logic structure of the electronic inductive switch circuit of the present invention;
FIG. 3 is a schematic diagram of waveforms of control signals generated by the control circuit of the sensing circuit according to the present invention;
FIG. 4A is a waveform diagram of a PWM pulse signal according to the present invention;
FIG. 4B is a waveform diagram of a positive DC voltage;
FIG. 4C is a waveform diagram of a negative DC voltage;
fig. 5 is a schematic diagram of an electrical device structure of the electronic inductive switch circuit of the present invention.
Detailed Description
Various embodiments of the present invention are described below with reference to the accompanying drawings, which form a part hereof. It is to be understood that, although directional terms, such as "front", "rear", "upper", "lower", "left", "right", etc., may be used in the present invention to describe various example structural parts and elements of the present invention, these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Since the disclosed embodiments of the invention may be arranged in a variety of orientations, these directional terms are used by way of illustration only and are in no way limiting. Wherever possible, the same or like reference numerals are used throughout the drawings to refer to the same parts.
Fig. 1 is a schematic diagram of a mechanical layout structure of an electronic inductive switch according to the present invention.
The present invention is an electronic induction switch assembly 100 disposed within a vehicle charging plug mounting housing 10 (not shown), the electronic induction switch assembly 100 generally comprising a movably rotatable support member 40, a ganged switch 101 of magnets 50 disposed on the support member 40, and a magnetic switch assembly 20 and other circuit elements disposed below on a circuit board 28.
A rotation shaft 19 is provided at a central position of the support 40, and the rotation shaft 19 is used to support the support 40 and allow the support 40 to rotate. The support 40 has a holding portion 46 below the left end thereof, and a magnet 50 is provided to the holding portion 46 of the support 40. The right end of the support 40 is provided with a force receiving portion 44. The force receiving portion 44 is adapted to receive an external pressure to drive the support member 40 to rotate with respect to the mounting case 10. The force receiving portion 44 and the abutment portion 42 are disposed in counter-rotation with each other. That is, the front end and the rear end of the support member 40 are provided so as to be reversely rotatable with respect to each other in the direction in which the vehicle charging switch 101 is mated with the mating receptacle. When the force receiving portion 44 is pressed to approach the mounting case 10, the abutment portion 42 is reversely rotated to be away from the mounting case 10. When the force receiving portion 44 is pressed by a person to perform an opening or closing operation of the switch, the holding portion 46 is movable toward and away from the magnetic switch assembly 20 as the supporting member 40 rotates along the rotation shaft 19.
The magnetic switch assembly 20, which may also be referred to as a magnetically controlled switch assembly, is a device that controls the switching of a corresponding line (or electronic component) in response to a magnetic field signal. The magnetic switch assembly 20 is arranged to be turned on or off in dependence of a detected change in the magnetic field strength. It is contemplated that the magnetic field strength to the magnetic switch assembly 20 changes during the approaching and moving away of the magnet 50. The specific type, specification and switching principle of the magnetic switch assembly 20 are only required to be capable of realizing corresponding on or off according to the corresponding change of the magnetic field intensity. For example, when the magnet 50 approaches the magnetic switch assembly 20 to a certain preset position, the magnetic field strength detected by the magnetic switch assembly 20 is increased to a conduction threshold value, so as to conduct a conduction action; when the magnet 50 is moved away from the magnetic switch assembly 20 to another predetermined position, the magnetic field strength detected by the magnetic switch assembly 20 decreases to an open threshold, thereby performing an opening action of the circuit.
To facilitate the switching operation and to enhance the accuracy of the reaction, the magnetic switch assembly 20 includes a magnetic field sensor 25. The magnetic field sensor 25 may also be referred to as a magnetic sensor, or a magnetic sensing element. The magnetic field sensor 25 is used to sense the magnetic field strength. In the present embodiment, the magnetic field sensor 25 is used to sense the provided magnetic field strength of the magnet 50. The specific specification and type of the magnetic field sensor 25 may be one that satisfies the strength of the induced magnetic field. The magnetic field sensor 25 may be a magneto-resistive sensor, or a position sensor. In the present embodiment, the magnetic field sensor 25 is a hall sensor, or a hall switch. Further, the magnetic field sensor 25 is provided on the circuit board 28. The magnetic field sensor 25 is electrically connected to the circuit board 28 and transmits a corresponding sensed signal to the circuit board 28.
In order to further improve the reaction accuracy and precision of the magnetic switch assembly 20, the switch 101 for car charging further includes a ferromagnetic member 60. The ferromagnetic member 60 is made of a ferromagnetic material. That is, the magnetic moment generated by the molecular current of the ferromagnetic member 60 is macroscopically equal to zero when the ferromagnetic member is not subjected to the magnetic field, and the magnetic moment of the internal molecule is aligned and magnetized when the ferromagnetic member is subjected to the magnetic field. The ferromagnetic member 60 is used to introduce magnetic lines of force drawn from the magnet 50 into the magnetic switch assembly 20.
The present invention incorporates the entire technical proposal of the patent application entitled "switch for automobile charging and connector for automobile charging" (internal application No. P251-TE-CN) filed by the applicant on the same date as the present application. The magnetic field sensor 25 and other electronics of the electronic inductive switch assembly 100 on the circuit board 28 are shown in circuit diagram form in fig. 2.
FIG. 2 is a schematic diagram of the logic structure of the electronic inductive switch circuit of the present invention;
to realize the normal operation of the electronic induction switch assembly 100, power needs to be supplied to each component of the electronic induction switch assembly 100, but in order to avoid adding another power supply line as power supply in the vehicle charging plug, the electronic induction switch circuit 200 of the present invention is designed to directly take the PWM pulse signal output on the Control pilot circuit 205 (CP line) serving as a communication line in the vehicle charging plug as a power source, control the power of the pilot circuit 205 or the power supply circuit 209 derived from the charging pile, which is used to connect the load 206 on the vehicle, and transmit signals through the on-off of the PWM pulse signal output. The present invention does not affect the power supplied by the control and steering circuit 205 to the load 206 when the control and steering circuit 205 is used to additionally power the electronic inductive switch assembly 100. It is also one of the problems to be solved by the present invention to reduce the power consumption of the power consuming components of the electronic inductive switch assembly 100.
As shown in fig. 2, the support 40 and the magnet 50 in the interlock switch 101 of fig. 1 are simplified in schematic form in fig. 2, and the support 40 rotates around the rotation shaft 19 and moves the magnet 50 up and down. The electronic sensing switching circuit 200 includes a separation circuit 210, a sensing circuit 201, a sensing circuit control circuit 202, and a switching circuit 230.
The separation circuit 210 is a power collection and supply circuit, and receives a PWM pulse signal provided by the control guiding circuit 205, where the PWM pulse signal itself includes positive phase PWM pulses 402 and negative phase PWM pulses 401 (see fig. 4A) with different duty ratios, and the separation circuit 210 includes a first rectifying circuit and a second rectifying circuit (see fig. 5), where the first rectifying circuit generates a positive phase dc voltage 411 according to the positive phase PWM pulses 402, and the second rectifying circuit generates a negative phase dc voltage 412 according to the negative phase PWM pulses 401 (see fig. 4B and 4C).
A sensing circuit 201 provided with the magnetic field sensor 25 in fig. 1, for sensing the stroke or position change of the magnet 50 in the interlock switch 101 to generate a position sensing signal; the induction circuit 201 is connected with the second rectifying circuit and uses the negative phase direct current voltage 412 as an operating voltage;
the induction circuit control circuit 202 is used for controlling the induction circuit 201, and the induction circuit control circuit 202 is connected with the second rectifying circuit to use the negative-phase direct-current voltage 412 as an operating voltage, and controls the operating mode of the induction circuit 201 to be in an operating mode or a sleep mode (see fig. 3) so as to reduce the power consumption thereof;
the switching circuit 230, the switching circuit 230 is connected to the first rectifying circuit using the positive dc voltage 411 as an operating voltage, and is connected to the sensing circuit 201 to receive the position sensing signal and to be turned on or off according to the received position sensing signal (see fig. 5 for specific operating principles and circuit structures).
The switch circuit 230 is connected to the connection confirmation circuit 237, and the connection confirmation circuit 237 senses the resistance value of the switch circuit 230 to determine whether the interlock switch 101 is in the closed or open state.
FIG. 3 is a schematic diagram of waveforms of control signals generated by the control circuit of the sensing circuit according to the present invention;
first, as shown in fig. 2, the connection of the sensing circuit control circuit 202 controls the sensing circuit 201, and the sensing circuit control circuit 202 controls the operation mode of the sensing circuit 201 by outputting a control signal. As shown in fig. 3, the control signal waveform generated by the control circuit 202 of the sensing circuit is shown in fig. 3, the sensing circuit 201 is in the first mode, i.e. the working state, when receiving the control signal of the first state in the figure, i.e. the waveform 301 segment signal, and the received waveform 302 segment signal is in the second mode, i.e. the standby state, the duration of the waveform 301 (high level) is t1, and the duration of the sensing circuit 201 receives the control signal of the second state in the figure, i.e. the waveform 302 (low level) is t2. In the operating state, the sensing circuit 201 has a first operating current of 4mA and a first operating time t1:40us; in the standby state, the sensing circuit 201 has a second operating current 13uA and a second operating time t2:100ms. And the process is repeated in a circulating way. It can be seen that the first operation time is much smaller than the second operation time, so that the actual operation time of the sensing circuit 201 is very short relative to the sleep state, and the power consumption is greatly reduced. However, the switching frequency of the operating state and the standby state of the sensing circuit 201 is far greater than the frequency of opening or closing the interlock switch 101 of the vehicle charging plug, so that the time-sharing operating state does not affect the sensing of the operating state of the interlock switch 101.
FIG. 4A is a waveform diagram of a PWM pulse signal according to the present invention;
as shown in fig. 4A, the PWM pulse signal transmitted by the control pilot circuit 205 includes a positive phase duty cycle signal 402 and a negative phase duty cycle signal 401 with different duty cycles, and as an embodiment, the duty cycle of the positive phase duty cycle signal 402 of the present invention is 13.5%, the duty cycle of the negative phase duty cycle signal 401 is 86.5%, it is seen that the waveform of the PWM pulse signal is continuous, and the duty cycles of the positive phase duty cycle signal 402 and the negative phase duty cycle signal 401 are complementary. The separation circuit filters and rectifies the positive phase duty ratio signal 402 and the negative phase duty ratio signal 401 through the first rectification circuit and the second rectification circuit to obtain the positive phase direct current voltage 411 and the negative phase direct current voltage 412 in fig. 4A and fig. 4B.
Fig. 4B and 4C are waveform diagrams of positive and negative dc voltages, respectively;
the first rectifying circuit rectifies by using a first resistor 512 and a first diode 513 (see fig. 5), filters by using a first capacitor 517, and the positive electrode of the first diode 513 is connected with the control guiding circuit 205 to pick up a signal of a positive duty ratio 402 thereof for filtering and rectifying to obtain a positive direct-current voltage 411 as shown in fig. 4B; similarly, the second rectifying circuit rectifies with the second resistor 514 and the second diode 516 (see fig. 5), filters with the second capacitor 518, and the negative electrode of the second diode 516 is connected to the control guiding circuit 205, and captures the negative phase duty cycle signal 401 thereof for filtering and rectifying to obtain the negative phase dc voltage 412 as shown in fig. 4C. The positive and negative dc voltages 411 and 412 are continuous dc voltages, which are 9V and 6V, respectively, as an example of a specific circuit.
Fig. 5 is a schematic diagram of an electrical device structure of the electronic inductive switch circuit of the present invention.
As shown in fig. 5, the electronic sensing switching circuit 200 includes a separation circuit 210, a sensing circuit 201, a sensing circuit control circuit 202, and a switching circuit 230.
The separation circuit 210 includes a first rectifying circuit and a second rectifying circuit, specifically: the first rectifying circuit includes a first resistor 512, a first diode 513, and a first capacitor 517; the first end 501 of the first resistor 512 receives the PWM pulse signal, and the second end 502 of the first resistor 512 is connected to the anode 503 of the first diode 513; the cathode 504 of the first diode 513 is connected to the first end 581 of the first capacitor 517 and forms a first common connection point 571; the second end 582 of the first capacitor 517 is grounded; the first common connection point 571 is the output of the positive dc voltage 411.
The second rectifying circuit includes a second resistor 514, a second diode 516, a second capacitor 518, and a third diode 519; the first end 505 of the second resistor 514 receives the PWM pulse signal, and the second end 506 of the second resistor 514 is connected to the cathode 507 of the second diode 516; the anode 508 of the second diode 516 is connected to the first terminal 583 of the second capacitor 518; the second end 584 of the second capacitor 518 is connected to the positive pole 585 of the third diode 519, and the negative pole 586 of the third diode 519 is the output end of the negative dc voltage 412.
As an embodiment, the sensing circuit 201 is a hall sensing unit 201, and an input terminal 525 of the hall sensing unit 201 is connected to the negative dc voltage 412 output by the negative electrode 586 of the third diode 519; the sensing circuit control circuit 202 is also connected to the negative dc voltage 412 output by the negative electrode 586 of the third diode 519, and the output of the sensing circuit control circuit 202 is connected to the hall sensing unit 201, and sends out a control signal as shown in fig. 3 to control the hall sensing unit 201 to operate, where the hall sensing unit 201 senses the movement of the magnet 50 in fig. 1 and 2 in an operating state, and generates a position sensing signal. As an embodiment, the hall sensing unit 201 and the sensing circuit control circuit 202 may be disposed in the same electrical chip 220, and the sensing circuit control circuit 202 may also implement connection and control of the hall sensing unit 201 through another circuit or element. The output terminal 524 of the electrical chip 220 is the output terminal of the hall sensing unit 201, and is the output terminal of the position sensing signal.
The switching circuit 230 includes a field effect transistor 531. The field effect transistor 531 includes a gate 541, a source 543, and a drain 542; the gate 541 of the field effect tube 531 is connected to the output end 524 of the hall sensing unit 201 and the cathode of the first diode 513 of the first rectifying circuit at the same time, and receives the position sensing signal of the hall sensing unit 201 and the positive dc voltage 411 output by the first rectifying circuit, where the positive dc voltage 411 is the gate trigger high level of the field effect tube 531. The source 543 of the fet 531 is grounded; the drain 542 of the FET 531 is connected to a status indication circuit. The field effect tube 531 receives the position sensing signal of the hall sensing unit 201 at the same time, so that it outputs a first state value when it is turned on, and outputs a second state value when it is turned off. The first resistance value and the second resistance value are implemented by a status indication circuit.
The status indication circuit includes a fourth resistor 534 and a fifth resistor 535; the fourth resistor 534 and the fifth resistor 535 are connected in series, and a first end 551 of the fourth resistor 534 is connected to a first end 552 of the fifth resistor 535 to form a second common connection 588 therebetween; the second end 554 of the fourth resistor 534 is the output end 537 of the status indicating circuit, and the second end 553 of the fifth resistor 535 is grounded; the drain 542 of the fet 531 is connected to a second common connection 588 between the fourth resistor 534 and the fifth resistor 535. When the field effect tube 531 receives the positive dc voltage 411 and the position sensing signal at the same time, the source 543 and the drain 542 of the field effect tube 531 are turned on, the fifth resistor 535 is shorted, the output end 537 outputs the resistance value of the fourth resistor 534 as the first state value, and the connection confirmation circuit 207 determines that the interlock switch 101 is turned on; when the fet 531 does not receive the position sensing signal, the source 543 and the drain 542 are turned off, the fourth resistor 534 and the fifth resistor 535 are connected in series, and the output 537 outputs the sum of the resistance values of the fourth resistor 534 and the fifth resistor 535 as the second status value, at which time the connection confirmation circuit 207 determines that the interlock switch 101 is turned off.
It should be added that the electronic inductive switching circuit 200 further includes a fourth diode 532 and a fifth diode 533. The anode of the fourth diode 532 is connected to the first common connection point 571, and the cathode of the fourth diode 532 is connected to the gate 541 of the field effect transistor 531. The fourth diode 532 turns on the positive dc voltage 411 half-way. The positive electrode 566 of the fifth diode 533 is grounded, and the negative electrode 565 of the fifth diode 533 is connected between the negative electrode 564 of the fourth diode 532 and the common connection point of the gate 541 of the field-effect transistor 531, thereby protecting the gate 541 of the field-effect transistor 531 as a zener diode.
The electronic sensing switch circuit 200 further includes a sixth diode 536, wherein a negative pole 565 of the sixth diode 536 is connected to the second end 554 of the fourth resistor 534, and an positive pole 572 of the sixth diode 536 is grounded. The sixth diode 536 is used to prevent the voltage surge from the output 537 of the status indication circuit from damaging the drain 542 of the fet 531.
The electronic sensing switch circuit 200 further includes a third resistor 522, where the third resistor 522 is connected between the first common connection point 571 and the anode of the fourth diode 532, and acts as a current limiting resistor to limit the current generated by the positive dc voltage.
The fourth diode 532, the fifth diode 533, the sixth diode 536, the third resistor 522 and the like are used for protecting electric elements such as the field effect tube 531 and the like from normal operation in a complex electromagnetic environment, so that the anti-electromagnetic interference capability is improved.
The invention adopts the separation circuit 210 to receive the PWM pulse signal provided by the control guide circuit 205, rectifies and filters the positive phase PWM pulse 402 and the negative phase PWM pulse 401 of the PWM pulse signal to generate a positive phase direct current voltage 411 and a negative phase direct current voltage 412, and provides the positive phase direct current voltage 411 and the negative phase direct current voltage 412 to the switch circuit 230 and the induction circuit 201 respectively as working voltages. In order to reduce energy consumption, the induction circuit 201 is controlled to be in an intermittent working state by the induction circuit control circuit 202, and a position sensing signal generated by detecting the movement of the magnet 50 on the linkage switch 101 is sent to the switch circuit 230 when in the working state, the switch circuit 230 receives the position sensing signal to judge whether the state of the linkage switch 101 is open or closed, the circuit structure is ingenious, and the normal operation of the control guide circuit 205 is not affected when the induction circuit 201 and the switch circuit 230 are powered without adding additional power supply circuits.
Although the invention will be described with reference to the specific embodiments shown in the drawings, it should be understood that many variations of the electronic inductive switching circuit of the present invention are possible without departing from the spirit and scope and the background of the teachings of the invention. Those of ordinary skill in the art will also recognize that there are different ways to alter the parameters of the disclosed embodiments of the invention that fall within the spirit and scope of the invention and the claims.
Claims (28)
1. An electronic inductive switching circuit (200) for sensing a travel or position of a ganged switch (101), comprising:
-a separation circuit (210), the separation circuit (210) receiving a PWM pulse signal, the PWM pulse signal comprising a positive phase PWM pulse (402) and a negative phase PWM pulse (401), the separation circuit (210) generating a positive phase dc voltage (411) from the positive phase PWM pulse (402), the separation circuit (210) generating a negative phase dc voltage (412) from the negative phase PWM pulse (401);
a sensing circuit (201) for sensing a stroke or a position of the interlock switch (101) to generate a position sensing signal, the sensing circuit (201) using the negative phase direct current voltage (412) as an operating voltage;
the control circuit (202) uses the negative-phase direct-current voltage (412) as an operating voltage to control the operating mode of the induction circuit (201) so as to reduce the power consumption of the induction circuit, and the control circuit (202) controls the operating mode of the induction circuit (201) to operate in a first mode and a second mode;
a switching circuit (230), the switching circuit (230) receiving the position sensing signal using the positive dc voltage (411) as an operating voltage and outputting a closing or opening signal according to the received position sensing signal;
the separation circuit (210) includes:
a first rectifying circuit including a first resistor (512), a first diode (513), and a first capacitor (517); a first end (501) of the first resistor (512) receives a PWM pulse signal, and a second end (502) of the first resistor (512) is connected with an anode (503) of the first diode (513); -the negative pole (504) of the first diode (513) is connected to the first end (581) of the first capacitor (517) and forms a first common connection point (571); -a second end (582) of the first capacitor (517) is grounded; the first common connection point (571) is an output end of the positive direct-current voltage (411);
a second rectifying circuit including a second resistor (514), a second diode (516), a second capacitor (518), and a third diode (519); a first end (505) of the second resistor (514) receives a PWM pulse signal, and a second end (506) of the second resistor (514) is connected with a cathode (507) of the second diode (516); the anode (508) of the second diode (516) is connected with the first end (583) of the second capacitor (518); the second end (584) of the second capacitor (518) is connected with the positive electrode (585) of the third diode (519), and the negative electrode (586) of the third diode (519) is the output end of the negative-phase direct-current voltage (412).
2. The electronic inductive switching circuit of claim 1, wherein:
in the first mode, the sensing circuit (201) has a first operating current and a first operating time;
in the second mode, the sensing circuit (201) has a second operating current and a second operating time.
3. The electronic inductive switching circuit of claim 2, wherein:
the first mode is a working mode, and the sensing circuit (201) senses a stroke or position signal of the linkage switch (101) when in the working mode;
the second mode is a standby mode, and the sensing circuit (201) is not operated in the standby mode.
4. The electronic inductive switching circuit of claim 2, wherein:
the first operating current is greater than the second operating current;
the first working time is smaller than the second working time.
5. The electronic inductive switching circuit of claim 4, wherein:
the first operating current and the first operating time are 4mA and 40us, respectively;
the second operating current and the second operating time are 13uA and 100ms, respectively.
6. The electronic inductive switching circuit of claim 1, wherein:
the first resistor (512), the first capacitor (517) and the first diode (513) form a filtering rectifying circuit.
7. The electronic inductive switching circuit of claim 1, wherein:
the second resistor (514), the second capacitor (518) and the second diode (516) form a filtering rectifying circuit.
8. The electronic inductive switching circuit according to claim 1, characterized in that said inductive circuit (201) comprises:
and the control circuit (202) controls the working state of the Hall sensing unit (201A).
9. The electronic inductive switching circuit of claim 8, wherein:
a negative-phase direct-current voltage (412) output by a negative electrode (586) of the third diode (519) is received by the hall sensing unit (201A);
the Hall sensing unit (201A) senses movement of the linkage switch (101) and generates the position sensing signal.
10. The electronic inductive switching circuit of claim 1, characterized in that said switching circuit (230) comprises:
a field effect transistor (531),
the field effect transistor (531) comprises a grid electrode (541), a source electrode (543) and a drain electrode (542);
the grid electrode (541) of the field effect tube (531) is connected with the output end (524) of the induction circuit (201) and the cathode of the first diode (513) of the first rectifying circuit at the same time, and receives the position induction signal of the induction circuit (201) and the positive direct-current voltage (411) output by the first rectifying circuit;
the source electrode (543) of the field effect tube (531) is grounded; the drain electrode (542) of the field effect tube (531) is connected with a state indicating circuit, and the state indicating circuit is used for outputting a first state value when the field effect tube (531) is turned on and outputting a second state value when the field effect tube (531) is turned off.
11. The electronic inductive switching circuit of claim 10, wherein:
the positive direct-current voltage (411) triggers a high level for the grid electrode of the field effect transistor (531).
12. The electronic inductive switching circuit of claim 11, wherein said status indication circuit comprises:
a fourth resistor (534) and a fifth resistor (535);
the fourth resistor (534) and the fifth resistor (535) are connected in series;
a drain (542) of the field effect transistor (531) is connected between the fourth resistor (534) and the fifth resistor (535).
13. The electronic inductive switching circuit of claim 12, wherein
A first end (551) of the fourth resistor (534) is connected to a first end (552) of the fifth resistor (535) to form a second common connection point (588) therebetween;
a second end (554) of the fourth resistor (534) is an output end (537) of the status indicating circuit, and a second end (553) of the fifth resistor (535) is grounded;
the drain (542) of the field effect transistor (531) is connected to a second common connection point (588) between the fourth resistor (534) and the fifth resistor (535).
14. The electronic inductive switching circuit of claim 13, wherein
The first state value is a resistance value of a fourth resistor (534);
the second state value is a resistance value obtained by connecting the fourth resistor (534) and the fifth resistor (535) in series.
15. The electronic inductive switching circuit of claim 11, further comprising:
a fourth diode (532) and a fifth diode (533);
the positive electrode of the fourth diode (532) is connected with the first common connection point (571), and the negative electrode of the positive electrode of the fourth diode (532) is connected with the grid electrode (541) of the field effect tube (531);
-the negative pole (565) of the fifth diode (533) is connected between the negative pole (564) of the fourth diode (532) and the common connection point of the gate (541) of the field-effect transistor (531);
the anode (566) of the fifth diode (533) is grounded.
16. The electronic inductive switching circuit of claim 12, further comprising:
a sixth diode (536) for preventing voltage surges from the output (537) of the status indication circuit from damaging the drain (542) of the field effect transistor (531);
-a negative pole (565) of said sixth diode (536) is connected to a second end (554) of said fourth resistor (534);
the anode (572) of the sixth diode (536) is grounded.
17. The electronic inductive switching circuit of any of claims 1-16, wherein:
a magnet device (102) is arranged on the linkage switch (101), and the magnet device (102) approaches or departs towards the Hall sensing unit (201A) along with the operation of the linkage switch (101);
the Hall sensing unit (201A) senses a change in a magnetic field generated by a change in stroke or position of the magnet device (102) to generate the position sensing signal.
18. The electronic inductive switching circuit of claim 1, wherein:
the PWM pulse signal is a control pilot circuit signal (205) from a vehicle charging plug.
19. The electronic inductive switching circuit of claim 1, wherein:
the duty cycles of the positive phase PWM pulse (402) and the negative phase PWM pulse (401) are complementary.
20. The electronic inductive switching circuit of claim 19, wherein:
the duty cycle of the normal phase PWM pulse (402) is 13.5%;
the duty cycle of the negative phase PWM pulse (401) is 86.5%.
21. The electronic inductive switching circuit of claim 18, wherein:
the PWM pulse signal output of the control guiding circuit (205) is simultaneously connected with a load (206) on the vehicle.
22. An electronic inductive switching system, comprising:
the electronic inductive switching circuit (200) of any of claims 1-21;
a ganged switch (101), the ganged switch (101) being movably arranged with respect to the electronic inductive switch circuit (200); a magnet device (102) is fixedly arranged on the linkage switch (101), and the magnet device (102) moves along with the linkage switch (101) and has approaching and separating positions relative to the electronic induction switch circuit (200); and
the sensing circuit (201) senses a change in a magnetic field generated by the movement of the magnet device (102) and generates a position sensing signal.
23. A power supply circuit characterized by comprising:
-a separation circuit (210), the separation circuit (210) receiving a PWM pulse signal, the PWM pulse signal comprising a positive phase PWM pulse (402) and a negative phase PWM pulse (401), the separation circuit (210) generating a positive phase dc voltage (411) from the positive phase PWM pulse (402), the separation circuit (210) generating a negative phase dc voltage (412) from the negative phase PWM pulse (401);
the control circuit (202) uses the negative-phase direct-current voltage (412) as a working voltage to control the working mode of an induction circuit (201) so as to reduce the power consumption of the induction circuit, and the control circuit (202) sends a control signal to the induction circuit (201) to control the induction circuit (201) to work in a first mode and a second mode;
the separation circuit (210) includes:
a first rectifying circuit including a first resistor (512), a first diode (513), and a first capacitor (517); a first end (501) of the first resistor (512) receives a PWM pulse signal, and a second end (502) of the first resistor (512) is connected with an anode (503) of the first diode (513); -the negative pole (504) of the first diode (513) is connected to the first end (581) of the first capacitor (517) and forms a first common connection point (571); -a second end (582) of the first capacitor (517) is grounded; the first common connection point (571) is an output end of the positive direct-current voltage (411);
a second rectifying circuit including a second resistor (514), a second diode (516), a second capacitor (518), and a third diode (519); a first end (505) of the second resistor (514) receives a PWM pulse signal, and a second end (506) of the second resistor (514) is connected with a cathode (507) of the second diode (516); the anode (508) of the second diode (516) is connected with the first end (583) of the second capacitor (518); the second end (584) of the second capacitor (518) is connected with the positive electrode (585) of the third diode (519), and the negative electrode (586) of the third diode (519) is the output end of the negative-phase direct-current voltage (412).
24. The power supply circuit of claim 23, wherein:
the sensing circuit (201) receives a control signal of a first state and is in a first mode;
the sensing circuit (201) receives the control signal of the second state in the second mode.
25. The power supply circuit of claim 24, wherein:
in the first mode, the sensing circuit (201) has a first operating current and a first operating time;
in the second mode, the sensing circuit (201) has a second operating current and a second operating time;
the duration of the control signal of the first state is a first operating time of the sensing circuit (201);
the control signal of the second state is of a duration of a second operation time of the sensing circuit (201).
26. The power supply circuit of claim 25, wherein:
the first mode is a working mode, and the sensing circuit (201) senses a stroke or position signal of the linkage switch (101) when in the working mode;
the second mode is a standby mode, and the sensing circuit (201) is not operated in the standby mode.
27. The power supply circuit of claim 25, wherein:
the first operating current is less than the second operating current;
the first working time is smaller than the second working time.
28. The power supply circuit of claim 27, wherein:
the first operating current and the first operating time are 4mA and 40us, respectively; the second operating current and the second operating time are 13uA and 100ms, respectively.
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| CN201710147594.2A CN108574481B (en) | 2017-03-13 | 2017-03-13 | Electronic induction switch circuit, electronic induction switch system and power supply circuit |
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| CN201710147594.2A CN108574481B (en) | 2017-03-13 | 2017-03-13 | Electronic induction switch circuit, electronic induction switch system and power supply circuit |
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| CN108574481B true CN108574481B (en) | 2024-03-01 |
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| CN113623255B (en) * | 2020-05-09 | 2024-05-28 | 中国石油天然气股份有限公司 | Ventilator detection method and device and variable frequency motor |
| CN113054973B (en) * | 2021-03-29 | 2023-03-03 | 三诺生物传感股份有限公司 | Control method and circuit for startup and shutdown of glucometer |
| CN114833542B (en) * | 2022-05-18 | 2023-07-18 | 北京天玛智控科技股份有限公司 | Flexible assembly system and method based on mechanical sensor |
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