CN108574481B - Electronic induction switch circuit, electronic induction switch system and power supply circuit - Google Patents

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

Electronic induction switch circuit, electronic induction switch system and power supply circuit

Technical field

The present invention relates to a switch device, in particular to a switch device for automobile charging.

Background technique

In order to respond to the requirements of energy conservation and environmental protection, electric vehicles are increasingly used in production and life. Electric vehicles use batteries as their power source. Therefore, electric vehicles need to be charged every certain period of time. Generally speaking, electric vehicles use charging guns for charging. The switch is an important part of the charging gun. The car charging switches in the prior art are often mechanical switches. The mechanical switch realizes the switching on and off of the switch through direct contact. This method has shortcomings such as limited service life and low accuracy.

Contents of the invention

One of the purposes of the present invention is to overcome the deficiencies in the prior art and provide a power supply and working circuit for an electromagnetic switch for automobile charging that responds to magnetic field changes. The specific technical solution is as follows:

An electronic induction switch circuit used to sense the stroke or position of a linkage switch, which is characterized by including: a separation circuit, the separation circuit receives a PWM pulse signal, and the PWM pulse signal includes a positive phase PWM pulse and a negative phase PWM pulse. , the separation circuit generates a positive phase DC voltage according to the positive phase PWM pulse, the separation circuit generates a negative phase DC voltage according to the negative phase PWM pulse; the induction circuit is used to sense the stroke or position of the linkage switch to generate a position Induction signal, the induction circuit uses the negative-phase DC voltage as a working voltage; a control circuit, the control circuit uses the negative-phase DC voltage as a working voltage to control the working mode of the induction circuit to reduce its power Consumption; switch circuit, the switch circuit uses the positive-phase DC voltage as the operating voltage, receives the position sensing signal, and outputs a closing or opening signal according to the received position sensing signal.

As in the electronic induction switch circuit described above, the control circuit controls the working mode of the induction circuit to operate in the first mode and the second mode; in the first mode, the induction circuit has a third An operating current and a first operating time; in the second mode, the sensing circuit has a second operating current and a second operating time.

As in the electronic induction switch circuit described above, the first mode is the working mode, and the induction circuit senses the stroke or position signal of the linkage switch in the working mode; the second mode is the standby mode, so The sensing circuit does not work in the standby mode.

As in the electronic induction switch circuit described above, the first operating current is greater than the second operating current; the first operating time is less than the second operating time.

As in the electronic induction switch circuit described above, the first working current and the first working time are 4mA and 40us respectively; the second working current and the second working time are 13uA and 100ms respectively.

As in the electronic induction switch circuit described above, the separation circuit includes: a first rectifier circuit, the first rectifier circuit includes a first resistor, a first diode and a first capacitor; the first resistor The first end receives the PWM pulse signal, the second end of the first resistor is connected to the anode of the first diode; the cathode of the first diode is connected to the first end of the first capacitor and forms a third A common connection point; the second end of the first capacitor is grounded; the first common connection point is the output end of the positive-phase DC voltage; a second rectifier circuit, the second rectifier circuit includes a second resistor, a second diode, a second capacitor and a third diode; the first end of the second resistor receives the PWM pulse signal, and the second end of the second resistor is connected to the cathode of the second diode; The anode of the second diode is connected to the first end of the second capacitor; the second end of the second capacitor is connected to the anode of the third diode, and the cathode of the third diode is The output terminal of the negative phase DC voltage.

As in the electronic induction switch circuit described above, the first resistor, the first capacitor and the first diode constitute a filter rectifier circuit.

As in the electronic induction switch circuit described above, the second resistor, the second capacitor and the second diode constitute a filter rectifier circuit.

As in the electronic induction switch circuit described above, the induction circuit includes a Hall induction unit, and the control circuit controls the working state of the Hall induction unit.

As in the electronic induction switch circuit described above, the Hall induction unit receives the negative phase DC voltage output from the negative electrode of the third diode; the Hall induction unit senses the movement of the linkage switch and generates the Position sensing signal.

The electronic induction switch circuit as described above, the switch circuit includes: a field effect transistor; the field effect transistor includes a gate, a source and a drain; the gate of the field effect transistor is simultaneously connected to the induction circuit The output end and the cathode of the first diode of the first rectifier circuit receive the position sensing signal of the induction circuit and the positive phase DC voltage output by the first rectifier circuit; the source of the field effect transistor is grounded ; The drain of the field effect transistor is connected to a status indication circuit, and the status indication circuit is used to output a first status value when the field effect transistor is turned on, and output a second status value when the field effect transistor is turned off.

As in the electronic induction switch circuit described above, the positive-phase DC voltage is the gate triggering high level of the field effect transistor.

As in the electronic induction switch circuit described above, the status indication circuit includes: a fourth resistor and a fifth resistor; the fourth resistor and the fifth resistor are connected in series; the drain of the field effect transistor is connected to the first between the fourth resistor and the fifth resistor.

As in the electronic induction switch circuit described above, the first end of the fourth resistor is connected to the first end of the fifth resistor to form a second common connection point between the two; The second end is the output end of the status indication circuit, the second end of the fifth resistor is connected to ground; the drain of the field effect transistor is connected to the second common connection between the fourth resistor and the fifth resistor. The dots are connected.

As in the electronic induction switch circuit described above, the first state value is the resistance value of the fourth resistor; the second state value is the resistance value of the fourth resistor and the fifth resistor connected in series.

The electronic induction switch circuit as mentioned above also includes: a fourth diode and a fifth diode; the anode of the fourth diode is connected to the first common connection point, and the anode of the fourth diode is connected to the first common connection point. The cathode of the fifth diode is connected to the gate of the field effect transistor; the cathode of the fifth diode is connected between the cathode of the fourth diode and the common connection point of the gate of the field effect transistor; The anode of the fifth diode is connected to ground.

The electronic induction switch circuit as described above further includes: a sixth diode, used to prevent the voltage surge from the output end of the status indicating circuit from damaging the drain of the field effect transistor; The cathode of the diode is connected to the second end of the fourth resistor; the anode of the sixth diode is connected to ground.

As in the electronic induction switch circuit described above, the linkage switch is provided with a magnet device, and the magnet device will approach or move away from the Hall induction unit as the linkage switch is operated; the Hall induction unit senses the The change in the magnetic field generated by the change in stroke or position of the magnet device generates the position sensing signal.

As in the electronic induction switch circuit described above, the PWM pulse signal is a control guidance circuit signal from the vehicle charging plug.

As in the electronic induction switch circuit described above, the duty ratios of the positive-phase duty cycle signal and the negative-phase duty cycle signal are complementary.

As in the electronic induction switch circuit described above, the duty cycle of the positive-phase PWM pulse is 13.5%; the duty cycle of the negative-phase PWM pulse is 86.5%.

As with the electronic induction switch circuit described above, the PWM pulse signal output of the control guidance circuit is simultaneously connected to the load on the vehicle.

The second object of the present invention is to provide an electronic induction switch system, including: the electronic induction switch circuit as mentioned above;

A linkage switch, the linkage switch is movably arranged relative to the electronic induction switch circuit; a magnet device is fixed on the linkage switch, and the magnet device moves with the linkage switch and is relative to the electronic induction switch circuit It has close and far away positions; and the induction circuit senses changes in the magnetic field generated by the movement of the magnet device and generates a position sensing signal.

The third object of the present invention is to provide a power supply circuit, including:

A separation circuit, the separation circuit receives a PWM pulse signal, the PWM pulse signal includes a positive phase PWM pulse and a negative phase PWM pulse, the separation circuit generates a positive phase DC voltage according to the positive phase PWM pulse, the separation circuit is based on The negative-phase PWM pulse generates a negative-phase DC voltage; a control circuit uses the negative-phase DC voltage as a working voltage to control the working mode of an induction circuit to reduce its power consumption.

As in the power supply circuit described above, the control circuit sends a control signal to the induction circuit to control the induction circuit to work in the first mode and the second mode; the induction circuit receives the control signal of the first state and is in the first mode; the induction circuit The control signal receiving the second state is in the second mode.

As in the power supply circuit described above, in the first mode, the induction circuit has a first operating current and a first operating time; in the second mode, the induction circuit has a second operating current and a first operating time. Two working times; 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 induction circuit.

As in the power supply circuit described above, the first mode is the working mode, and the induction circuit senses the stroke or position signal of the linkage switch in the working mode; the second mode is the standby mode, so The sensing circuit does not work in the standby mode.

As in the power supply circuit described above, the first operating current is smaller than the second operating current;

The first working time is less than the second working time.

As in the power supply circuit described above, 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 present invention uses a separation circuit to absorb the PWM pulse signal from the control guidance circuit in the vehicle charging plug, separates the positive phase PWM pulse and the negative phase PWM pulse in the PWM pulse signal into a positive phase DC voltage and a negative phase DC voltage, and uses the positive phase PWM pulse and the negative phase PWM pulse in the PWM pulse signal. The phase DC voltage supplies power to the switching circuit, and the negative phase DC voltage is used to power the induction circuit that senses the movement of the magnet device, and the induction circuit is controlled through the induction circuit control circuit to make it in working mode or standby mode to reduce power. consumption, so that it can normally sense the movement of the magnet device without affecting the normal load operation of the control and guidance circuit. The present invention uses electromagnetic elements as the induction switch of the charging gun to replace the mechanical switch, which has a longer service life. At the same time, it can sense the change of switch movement at a small distance and improve the sensing accuracy of the switch. The electronic induction switch circuit of the present invention can Without the need for an additional power supply, the PWM pulse signal in the control and guidance circuit in the charging gun is taken as the power supply for the switching system. At the same time, it does not affect the normal operation of the control and guidance circuit. It has great compatibility and also has the ability to Anti-interference ability in complex electromagnetic environment.

Description of drawings

Figure 1 is a schematic diagram of the mechanical layout structure of the electronic switch of the present invention;

Figure 2 is a schematic diagram of the logic structure of the electronic induction switch circuit of the present invention;

Figure 3 is a schematic diagram of the control signal waveform generated by the induction circuit control circuit of the present invention;

Figure 4A is a PWM pulse signal waveform diagram of the present invention;

Figure 4B is a waveform diagram of the positive-phase DC voltage;

Figure 4C is a waveform diagram of the negative phase DC voltage;

Figure 5 is a schematic structural diagram of the electrical components of the electronic induction switch circuit of the present invention.

Detailed ways

Various embodiments of the present invention will be described below with reference to the accompanying drawings, which form a part of this specification. It should be understood that although terms indicating directions are used herein, such as "front," "rear," "upper," "lower," "left," "right," etc., to describe various example structural parts of the present invention. and elements, but 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 present invention may be arranged in different directions, these directional terms are for illustration only and should not be considered limiting. Wherever possible, the same or similar reference numbers used in this disclosure refer to the same parts.

Figure 1 is a schematic diagram of the mechanical layout structure of the electronic induction switch of the present invention.

The present invention is an electronic induction switch assembly 100 disposed in a vehicle charging plug installation shell 10 (not shown in the figure). The electronic induction switch assembly 100 mainly includes a movably rotating support member 40 and a magnet provided on the support member 40 The linkage switch 101 composed of 50, as well as the magnetic switch assembly 20 and other circuit components provided on the circuit board 28 below.

A rotating shaft 19 is provided at the middle position of the supporting member 40. The rotating shaft 19 is used to support the supporting member 40 and enable the supporting member 40 to rotate. The support 40 has a holding portion 46 below the left end, and the magnet 50 is provided in the holding portion 46 of the support 40 . The right end of the support member 40 is provided with a force receiving portion 44 . The force-receiving portion 44 is used to withstand external pressure to drive the support member 40 to rotate relative to the installation shell 10 . The force-receiving portion 44 and the resisting portion 42 are arranged to rotate in opposite directions to each other. That is, in the direction in which the car charging switch 101 is plugged into the mating socket, the front end and the rear end of the support member 40 are arranged to rotate in opposite directions to each other. When the force-receiving portion 44 is pressed and approaches the installation shell 10 , the top portion 42 rotates reversely to move away from the installation shell 10 . When the force-receiving part 44 is pressed manually to realize the opening or closing operation of the switch, and the support member 40 rotates along the rotation axis 19 , the holding part 46 can move closer to and farther away from the magnetic switch assembly 20 .

The magnetic switch assembly 20, which can also be called a magnetically controlled switch assembly, is a device that controls the switching of corresponding circuits (or electronic components) based on magnetic field signals. The magnetic switch assembly 20 is configured to be turned on or off according to the detected change in magnetic field strength. It is conceivable that when the magnet 50 moves closer and farther away, the intensity of the magnetic field reaching the magnetic switch assembly 20 changes. The specific type, specifications and switching action principle of the magnetic switch assembly 20 only need to be able to achieve corresponding conduction or disconnection according to changes in corresponding magnetic field intensity. For example, when the magnet 50 approaches the magnetic switch assembly 20 to a certain preset position, the magnetic field intensity detected by the magnetic switch assembly 20 increases to a conduction threshold, thereby performing a conduction action; when the magnet 50 moves away from the magnetic switch assembly 20 to another At the preset position, the magnetic field intensity detected by the magnetic switch assembly 20 weakens to the disconnection threshold, thereby disconnecting the circuit.

In order to facilitate switch operation and improve response accuracy, the magnetic switch assembly 20 includes a magnetic field sensor 25 . The magnetic field sensor 25 can also be called a magnetic sensor or a magnetic sensing element. The magnetic field sensor 25 is used to sense the strength of the magnetic field. In this embodiment, the magnetic field sensor 25 is used to sense the strength of the magnetic field provided by the magnet 50 . The specific specifications and types of the magnetic field sensor 25 only need to meet the intensity of the induced magnetic field. The magnetic field sensor 25 may be a magnetoresistive sensor, or a position sensor. In this 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 corresponding sensed signals to the circuit board 28 .

In order to further improve the response precision and accuracy of the magnetic switch assembly 20 , the car charging switch 101 also includes a ferromagnetic component 60 . The ferromagnetic part 60 is made of ferromagnetic material. That is to say, when the ferromagnetic component 60 is not affected by a magnetic field, the synthetic magnetic moment generated by its molecular current is macroscopically equal to zero, so it does not exhibit magnetism. However, when it is affected by a magnetic field, the internal molecular magnetic moments are arranged neatly. magnetization. The ferromagnetic component 60 is used to introduce the magnetic field lines drawn from the magnet 50 into the magnetic switch assembly 20 .

The present invention cites all the technical solutions of another patent application titled "Automobile Charging Switch and Automobile Charging Connector" (internal case number: P251-TE-CN) filed by the applicant on the same filing date as this application. in the present invention. A circuit diagram of the magnetic field sensor 25 and other electronic components of the electronic induction switch assembly 100 on the circuit board 28 is shown in FIG. 2 .

Figure 2 is a schematic diagram of the logic structure of the electronic induction switch circuit of the present invention;

In order to realize the normal operation of the electronic induction switch assembly 100 mentioned above, power needs to be supplied to each component of the electronic induction switch assembly 100. However, in order to avoid adding another power supply line as a power supply in the vehicle charging plug, the electronic induction switch circuit 200 designed by the present invention Directly ingest the PWM pulse signal output on the control pilot circuit 205 (Control Piolot, CP line for short) used as a communication line in the vehicle charging plug as a power source. The power of the control pilot circuit 205 may come from the power circuit 209 on the charging pile. This is used to connect the load 206 on the vehicle and transmit the signal through the on and off of the PWM pulse signal output. When the present invention uses the control and guidance circuit 205 to provide additional power to the electronic induction switch assembly 100, it cannot affect the power supply of the control and guidance circuit 205 to the load 206. Therefore, reducing the power consumption of the power-consuming components of the electronic induction switch assembly 100 is also one of the problems that needs to be solved in the present invention.

As shown in FIG. 2 , the support member 40 and the magnet 50 in the linkage switch 101 in FIG. 1 are simplified in FIG. 2 . The support member 40 rotates around the rotation axis 19 and drives the magnet 50 to move up and down. The electronic induction switch circuit 200 includes a separation circuit 210, an induction circuit 201, an induction circuit control circuit 202 and a switch circuit 230.

The separation circuit 210 is a power collection and power supply circuit that receives the PWM pulse signal provided by the control guidance circuit 205. The PWM pulse signal itself includes positive-phase PWM pulses 402 and negative-phase PWM pulses 401 with different duty ratios (see Figure 4A). The separation circuit 210 includes a first rectifier circuit and a second rectifier circuit (see Figure 5). The first rectifier circuit generates a positive-phase DC voltage 411 based on the positive-phase PWM pulse 402, and the second rectifier circuit generates a negative-phase DC voltage 412 based on the negative-phase PWM pulse 401. (See Figure 4B and Figure 4C).

The induction circuit 201 is provided with the magnetic field sensor 25 in Figure 1, which senses the stroke or position change of the magnet 50 in the linkage switch 101 to generate a position sensing signal; the induction circuit 201 is connected to the second rectifier circuit and uses the negative phase DC voltage 412 as the operating voltage. ;

The induction circuit control circuit 202 is used to control the induction circuit 201. The induction circuit control circuit 202 is connected to the second rectifier circuit and uses the negative phase DC voltage 412 as the working voltage, and controls the working mode of the induction circuit 201 to be in the working mode or the sleep mode (see figure) 3), to reduce its power consumption;

The switch circuit 230 is connected to the first rectifier circuit and uses the positive-phase DC voltage 411 as the operating voltage, and is connected to the induction circuit 201 to receive the position sensing signal, and is closed or opened according to the received position sensing signal (specific working principle and The circuit structure is shown in Figure 5).

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 linkage switch 101 is in a closed or open state.

Figure 3 is a schematic diagram of the control signal waveform generated by the induction circuit control circuit of the present invention;

As shown in FIG. 2 , the connection of the induction circuit control circuit 202 controls the induction circuit 201 . The induction circuit control circuit 202 controls the working mode of the induction circuit 201 by outputting a control signal. As shown in Figure 3 is a schematic diagram of the control signal waveform generated by the induction circuit control circuit 202. The induction circuit 201 is in the first mode, that is, the working state when it receives the control signal in the first state in the figure, that is, the waveform 301 segment signal, and receives the waveform 302. The segment signal is in the second mode, that is, the standby state. The waveform 301 (high level) lasts for t1. The sensing circuit 201 receives the control signal of the second state in the figure, that is, the waveform 302 (low level) lasts for t2. . In the working state, the sensing circuit 201 has a first working current of 4mA and a first working time t1:40us; in a standby state, the sensing circuit 201 has a second working current of 13uA and a second working time t2:100ms. And so on. It can be seen that the first working time is much shorter than the second working time, so that the actual working state time of the sensing circuit 201 is extremely short compared to the sleep state, and its power consumption is greatly reduced. However, the switching frequency between the working state and the standby state of the induction circuit 201 is much greater than the frequency at which the linkage switch 101 of the vehicle charging plug is turned off or closed, so this time-sharing working state does not affect the sensing of the working state of the linkage switch 101 .

Figure 4A is a PWM pulse signal waveform diagram of the present invention;

As shown in Figure 4A, the PWM pulse signal transmitted by the control guidance circuit 205 includes a positive phase duty cycle signal 402 and a negative phase duty cycle signal 401 with different duty ratios. As an embodiment, the positive phase duty cycle signal of the present invention The duty cycle of the signal 402 is 13.5%, and the duty cycle of the negative phase duty cycle signal 401 is 86.5%. It can be seen that the waveform of the PWM pulse signal is continuous, and the positive phase duty cycle signal 402 and the negative phase duty cycle signal 401 The duty cycles are complementary. The separation circuit filters and rectifies the positive phase duty cycle signal 402 and the negative phase duty cycle signal 401 through the first rectifier circuit and the second rectifier circuit to obtain the positive phase DC voltage 411 and the negative phase DC voltage 412 in Figure 4A and Figure 4B .

Figure 4B and Figure 4C are waveform diagrams of positive-phase DC voltage and negative-phase DC voltage respectively;

The first rectifier circuit uses the first resistor 512 and the first diode 513 (see Figure 5) for rectification, and uses the first capacitor 517 for filtering. The anode of the first diode 513 is connected to the control guidance circuit 205 to capture its positive phase. After the duty cycle signal 402 is filtered and rectified, the positive-phase DC voltage 411 shown in Figure 4B is obtained; similarly, the second rectifier circuit uses the second resistor 514 and the second diode 516 (see Figure 5) for rectification. The second capacitor 518 is used for filtering, and the cathode of the second diode 516 is connected to the control steering circuit 205. The negative phase duty cycle signal 401 is taken in and filtered and rectified to obtain the negative phase DC voltage 412 as shown in Figure 4C. The positive phase DC voltage 411 and the negative phase DC voltage 412 are continuous DC voltages. As a specific embodiment of the circuit, their voltages are 9V and 6V respectively.

Figure 5 is a schematic structural diagram of the electrical components of the electronic induction switch circuit of the present invention.

As shown in FIG. 5 , the electronic induction switch circuit 200 includes a separation circuit 210 , an induction circuit 201 , an induction circuit control circuit 202 and a switch circuit 230 .

The separation circuit 210 includes a first rectifier circuit and a second rectifier circuit. Specifically: the first rectifier 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 PWM pulse signal, 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 end of the positive-phase DC voltage 411.

The second rectifier 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 of the second resistor 514 receives the PWM pulse signal. The terminal 506 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 terminal 584 of the second capacitor 518 is connected to the third diode 519. The positive electrode 585 and the negative electrode 586 of the third diode 519 are the output terminals of the negative phase DC voltage 412 .

As an embodiment, the sensing circuit 201 is a Hall sensing unit 201. The input terminal 525 of the Hall sensing unit 201 is connected to the negative phase DC voltage 412 output by the cathode 586 of the third diode 519; the sensing circuit control circuit 202 is also connected to the third The negative phase DC voltage 412 output by the cathode 586 of the diode 519, the output of the induction circuit control circuit 202 is connected to the Hall induction unit 201, and a control signal as shown in Figure 3 is sent to control the operation of the Hall induction unit 201. The Hall induction In the working state, the unit 201 senses the movement of the magnet 50 in Figures 1 and 2 and generates a position sensing signal. As an embodiment, the Hall sensing unit 201 and the sensing circuit control circuit 202 can be provided in the same electrical chip 220. The sensing circuit control circuit 202 can also realize the connection to the Hall sensing unit 201 through another circuit or component. and control. 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 transistor 531 is simultaneously connected to the output terminal 524 of the Hall sensing unit 201 and the cathode of the first diode 513 of the first rectifier circuit. , receiving the position sensing signal of the Hall sensing unit 201 and the positive-phase DC voltage 411 output by the first rectifier circuit. The positive-phase DC voltage 411 is the gate triggering high level of the field effect transistor 531. The source 543 of the field effect transistor 531 is connected to the ground; the drain 542 of the field effect transistor 531 is connected to the status indication circuit. The field effect transistor 531 simultaneously receives the position sensing signal of the Hall sensing unit 201 so that it outputs a first state value when it is turned on and a second state value when it is turned off. The first resistance value and the second resistance value are realized by the 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 the first end 551 of the fourth resistor 534 is connected to the first end 552 of the fifth resistor 535 to form two The second common connection point 588 between them; the second end 554 of the fourth resistor 534 is the output end 537 of the status indication circuit, the second end 553 of the fifth resistor 535 is grounded; the drain 542 of the field effect transistor 531 and the third The second common connection point 588 between the fourth resistor 534 and the fifth resistor 535 is connected. When the field effect transistor 531 receives the positive-phase DC voltage 411 and the position sensing signal at the same time, the source 543 and the drain 542 of the effect transistor 531 are connected, the fifth resistor 535 is short-circuited, and the output terminal 537 outputs the fourth resistor. The resistance value of 534 is used as the first state value. At this time, the connection confirmation circuit 207 determines that the linkage switch 101 is turned on; when the field effect transistor 531 does not receive the position sensing signal, the source 543 and the drain 542 are cut off, and the fourth resistor 534 and the fifth resistor 535 are connected in series, and the output terminal 537 outputs the sum of the resistance values of the fourth resistor 534 and the fifth resistor 535 as the second state value. At this time, the connection confirmation circuit 207 determines that the linkage switch 101 is disconnected.

It should be added that the electronic induction switch circuit 200 also 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 conducts the positive-phase DC voltage 411 in the semi-directional direction. The anode 566 of the fifth diode 533 is connected to ground, and the cathode 565 of the fifth diode 533 is connected between the cathode 564 of the fourth diode 532 and the common connection point of the gate 541 of the field effect transistor 531 as a voltage regulator. The diode protects the gate 541 of the field effect transistor 531 .

The electronic induction switch circuit 200 also includes a sixth diode 536. The cathode 565 of the sixth diode 536 is connected to the second end 554 of the fourth resistor 534, and the anode 572 of the sixth diode 536 is connected to ground. The sixth diode 536 is used to prevent the voltage surge from the output terminal 537 of the status indicating circuit from damaging the drain 542 of the field effect transistor 531 .

The electronic induction switch circuit 200 also includes a third resistor 522, which is connected between the first common connection point 571 and the anode of the fourth diode 532, and serves as a current limiting resistor to limit the current generated by the positive-phase DC voltage.

The fourth diode 532, the fifth diode 533, the sixth diode 536 and the third resistor 522 are used to protect the field effect transistor 531 and other electrical components to work normally in a complex electromagnetic environment and improve the ability to resist electromagnetic interference.

The present invention uses the separation circuit 210 to receive the PWM pulse signal provided by the control and guidance circuit 205, and 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 DC voltage 411 and a negative phase DC voltage 412. are respectively provided to the switching circuit 230 and the sensing circuit 201 as operating voltages. In order to reduce energy consumption, the induction circuit control circuit 202 controls the induction circuit 201 to be in the working state intermittently, and detects the movement of the magnet 50 on the linkage switch 101 during the working state to generate a position sensing signal and send it to the switching circuit 230. The switching circuit 230 receives the position sensing signal to determine whether the state of the linkage switch 101 is open or closed. The circuit structure is ingenious and does not require additional power supply lines to supply power to the sensing circuit 201 and the switch circuit 230 without affecting the control and guidance circuit 205. normal work.

Although the invention will be described with reference to specific embodiments illustrated in the drawings, it will be understood that many variations of the electronic inductive switch circuit of the invention are possible without departing from the spirit and scope and context of the teachings of the invention. One of ordinary skill in the art will also recognize that there are different ways to vary the parameters of the disclosed embodiments of the invention, all within the spirit and scope of the invention and claims.

Claims (28)

1. An electronic induction switch circuit (200) used to sense the stroke or position of the linkage switch (101), which is characterized by including: Separation circuit (210), the separation circuit (210) receives a PWM pulse signal, the PWM pulse signal includes a positive phase PWM pulse (402) and a negative phase PWM pulse (401), the separation circuit (210) according to the The positive phase PWM pulse (402) generates a positive phase DC voltage (411), and the separation circuit (210) generates a negative phase DC voltage (412) according to the negative phase PWM pulse (401); The induction circuit (201) is used to sense the stroke or position of the linkage switch (101) to generate a position sensing signal. The induction circuit (201) uses the negative phase DC voltage (412) as the operating voltage; Control circuit (202). The control circuit (202) uses the negative phase DC voltage (412) as a working voltage to control the working mode of the induction circuit (201) to reduce its power consumption. The control circuit (202) Control the working mode of the induction circuit (201) so that it works in the first mode and the second mode; Switching circuit (230), the switching circuit (230) uses the positive-phase DC voltage (411) as the operating voltage, receives the position sensing signal, and outputs closed or open according to the received position sensing signal. Signal; The separation circuit (210) includes: A first rectifier circuit, the first rectifier circuit includes a first resistor (512), a first diode (513) and a first capacitor (517); the first end (501) of the first resistor (512) To receive the PWM pulse signal, the second end (502) of the first resistor (512) is connected to the anode (503) of the first diode (513); the cathode (503) of the first diode (513) 504) Connect the first end (581) of the first capacitor (517) and form a first common connection point (571); the second end (582) of the first capacitor (517) is grounded; the first The common connection point (571) is the output end of the positive-phase DC voltage (411); A second rectifier circuit, the second rectifier circuit includes a second resistor (514), a second diode (516), a second capacitor (518) and a third diode (519); the second resistor (519) The first end (505) of 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 second The anode (508) of the diode (516) is connected to the first end (583) of the second capacitor (518); the second end (584) of the second capacitor (518) is connected to the third diode. The anode (585) of the tube (519), and the cathode (586) of the third diode (519) are the output terminal of the negative phase DC voltage (412). 2. The electronic induction switch circuit as claimed in claim 1, characterized in that: 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 induction switch circuit as claimed in claim 2, characterized in that: The first mode is a working mode, and the sensing circuit (201) senses the stroke or position signal of the linkage switch (101) in the working mode; The second mode is a standby mode, and the sensing circuit (201) does not work in the standby mode. 4. The electronic induction switch circuit as claimed in claim 2, characterized in that: The first operating current is greater than the second operating current; The first working time is less than the second working time. 5. The electronic induction switch circuit as claimed in claim 4, characterized in that: The first working current and the first working time are 4mA and 40us respectively; The second operating current and the second operating time are 13uA and 100ms respectively. 6. The electronic induction switch circuit as claimed in claim 1, characterized in that: The first resistor (512), the first capacitor (517) and the first diode (513) constitute a filter rectifier circuit. 7. The electronic induction switch circuit as claimed in claim 1, characterized in that: The second resistor (514), the second capacitor (518) and the second diode (516) constitute a filter rectifier circuit. 8. The electronic induction switch circuit according to claim 1, characterized in that the induction circuit (201) includes: Hall sensing unit (201A), the control circuit (202) controls the working state of the Hall sensing unit (201A). 9. The electronic induction switch circuit as claimed in claim 8, characterized in that: The Hall sensing unit (201A) receives the negative phase DC voltage (412) output by the cathode (586) of the third diode (519); The Hall sensing unit (201A) senses the movement of the linkage switch (101) and generates the position sensing signal. 10. The electronic induction switch circuit according to claim 1, characterized in that the switch circuit (230) includes: Field effect transistor (531), The field effect transistor (531) includes a gate (541), a source (543) and a drain (542); The gate electrode (541) of the field effect transistor (531) is simultaneously connected to the output terminal (524) of the induction circuit (201) and the cathode of the first diode (513) of the first rectifier circuit, receiving all The position sensing signal of the sensing circuit (201) and the positive-phase DC voltage (411) output by the first rectifier circuit; The source (543) of the field effect transistor (531) is connected to ground; the drain (542) of the field effect transistor (531) is connected to a status indication circuit, and the status indication circuit is used to connect the field effect transistor (531) to the ground. ) outputs a first state value when it is turned on, and outputs a second state value when the field effect transistor (531) is turned off. 11. The electronic induction switch circuit as claimed in claim 10, characterized in that: The positive-phase DC voltage (411) is the gate triggering high level of the field effect transistor (531). 12. The electronic induction switch circuit according to claim 11, characterized in that the status indication circuit includes: the fourth resistor (534) and the fifth resistor (535); The fourth resistor (534) and the fifth resistor (535) are connected in series; The drain electrode (542) of the field effect transistor (531) is connected between the fourth resistor (534) and the fifth resistor (535). 13. The electronic induction switch circuit as claimed in claim 12, characterized in that The first end (551) of the fourth resistor (534) is connected to the first end (552) of the fifth resistor (535) to form a second common connection point (588) between the two; The second end (554) of the fourth resistor (534) is the output end (537) of the status indication circuit, and the second end (553) of the fifth resistor (535) is grounded; The drain (542) of the field effect transistor (531) is connected to the second common connection point (588) between the fourth resistor (534) and the fifth resistor (535). 14. The electronic induction switch circuit as claimed in claim 13, characterized in that The first state value is the resistance value of the fourth resistor (534); The second state value is the resistance value of the fourth resistor (534) and the fifth resistor (535) connected in series. 15. The electronic induction switch circuit of claim 11, further comprising: The fourth diode (532) and the fifth diode (533); The anode of the fourth diode (532) is connected to the first common connection point (571), and the cathode of the anode of the fourth diode (532) is connected to the gate (541) of the field effect transistor (531). ); The cathode (565) of the fifth diode (533) is connected to the common connection between the cathode (564) of the fourth diode (532) and the gate (541) of the field effect transistor (531). between points; The anode (566) of the fifth diode (533) is grounded. 16. The electronic induction switch circuit of claim 12, further comprising: The sixth diode (536) is used to prevent the voltage surge from the output end (537) of the status indication circuit from damaging the drain (542) of the field effect transistor (531); The cathode (565) of the sixth diode (536) is connected to the second end (554) of the fourth resistor (534); The anode (572) of the sixth diode (536) is grounded. 17. The electronic induction switch circuit according to any one of claims 1-16, characterized in that: The linkage switch (101) is provided with a magnet device (102), and the magnet device (102) will approach or move away from the Hall induction unit (201A) as the linkage switch (101) is operated; The Hall sensing unit (201A) senses changes in the magnetic field generated by changes in stroke or position of the magnet device (102), and generates the position sensing signal. 18. The electronic induction switch circuit as claimed in claim 1, characterized in that: The PWM pulse signal is a control steering circuit signal (205) from the vehicle charging plug. 19. The electronic induction switch circuit as claimed in claim 1, characterized in that: The duty ratios of the positive-phase PWM pulse (402) and the negative-phase PWM pulse (401) are complementary. 20. The electronic induction switch circuit as claimed in claim 19, characterized in that: The duty cycle of the positive-phase PWM pulse (402) is 13.5%; The duty cycle of the negative phase PWM pulse (401) is 86.5%. 21. The electronic induction switch circuit as claimed in claim 18, characterized in that: The PWM pulse signal output of the control guidance circuit (205) is simultaneously connected to the load (206) on the vehicle. 22. An electronic induction switch system, characterized by including: The electronic inductive switch circuit (200) according to any one of claims 1-21; The linkage switch (101) is movably arranged relative to the electronic induction switch circuit (200); the linkage switch (101) is fixed with a magnet device (102), and the magnet device (102) is fixed on the linkage switch (101). 102) moves with the linkage switch (101) and has close and far away positions relative to the electronic induction switch circuit (200); and The induction circuit (201) senses changes in the 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: Separation circuit (210), the separation circuit (210) receives a PWM pulse signal, the PWM pulse signal includes a positive phase PWM pulse (402) and a negative phase PWM pulse (401), the separation circuit (210) according to the The positive phase PWM pulse (402) generates a positive phase DC voltage (411), and the separation circuit (210) generates a negative phase DC voltage (412) according to the negative phase PWM pulse (401); Control circuit (202). The control circuit (202) uses the negative phase DC voltage (412) as a working voltage to control the working mode of an induction circuit (201) to reduce its power consumption. The control circuit (202) 202) Send a control signal to the induction circuit (201) to control the induction circuit (201) to work in the first mode and the second mode; The separation circuit (210) includes: A first rectifier circuit, the first rectifier circuit includes a first resistor (512), a first diode (513) and a first capacitor (517); the first end (501) of the first resistor (512) To receive the PWM pulse signal, the second end (502) of the first resistor (512) is connected to the anode (503) of the first diode (513); the cathode (503) of the first diode (513) 504) Connect the first end (581) of the first capacitor (517) and form a first common connection point (571); the second end (582) of the first capacitor (517) is grounded; the first The common connection point (571) is the output end of the positive-phase DC voltage (411); A second rectifier circuit, the second rectifier circuit includes a second resistor (514), a second diode (516), a second capacitor (518) and a third diode (519); the second resistor (519) The first end (505) of 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 second The anode (508) of the diode (516) is connected to the first end (583) of the second capacitor (518); the second end (584) of the second capacitor (518) is connected to the third diode. The anode (585) of the tube (519), and the cathode (586) of the third diode (519) are the output terminal of the negative phase DC voltage (412). 24. The power supply circuit as claimed in claim 23, characterized in that: The sensing circuit (201) receives the control signal of the first state and is in the first mode; The sensing circuit (201) receives the control signal of the second state and is in the second mode. 25. The power supply circuit as claimed in claim 24, characterized in that: 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 in the first state is the first working time of the sensing circuit (201); The duration of the control signal in the second state is the second working time of the sensing circuit (201). 26. The power supply circuit as claimed in claim 25, characterized in that: The first mode is a working mode, and the sensing circuit (201) senses the stroke or position signal of the linkage switch (101) in the working mode; The second mode is a standby mode, and the sensing circuit (201) does not work in the standby mode. 27. The power supply circuit as claimed in claim 25, characterized in that: The first operating current is smaller than the second operating current; The first working time is less than the second working time. 28. The power supply circuit as claimed in claim 27, characterized in that: The first working current and the first working time are 4mA and 40us respectively; the second working current and the second working time are 13uA and 100ms respectively.