Control guide circuit of multi-state output, vehicle-mounted charger system and control method

Abstract

The application discloses a control guide circuit of multi-state output, a vehicle-mounted charging machine system and a control method. One end of a first signal input end in the circuit is connected with a control chip and the other end is connected with a second switch assembly, and the second switch assembly is also connected with a signal output end. One end of a second signal input end is connected with the control chip and the other end is also connected with the first switch assembly through a third switch device, and the first switch assembly is also connected with the signal output end. The first signal input end and the second signal input end both receive input signals of high level, low level or high resistance state. The first switch assembly, the second switch assembly and the third switch device are all used for opening or shutting off according to the received signals. The application outputs three-state output signals by detecting the opening or shutting off combination of the first switch assembly and the second switch assembly through the signal output end, and the circuit structure is simple, the material cost of the circuit is reduced, and the circuit has good stability and reliability.

Description

Technical Field

[0001] This invention relates to the field of on-board charger technology for electric vehicles, and in particular to a control and guidance circuit with multi-state output, an on-board charger system, and a control method. Background Technology

[0002] In an electric vehicle on-board charger (OBC) system, the control pilot (CP) circuit is a crucial component for enabling safe communication and status interaction between the vehicle and the charging equipment. The CP circuit needs to be able to output multiple voltage levels (e.g., high, low, high impedance) to accurately convey the vehicle's status (such as charging requirements).

[0003] Currently, common solutions for achieving such multi-state outputs often employ dedicated integrated circuits or complex level conversion and driving circuits. While these solutions offer comprehensive functionality, they suffer from limitations such as high cost and complex peripheral circuitry. Furthermore, some other solutions utilize simple push-pull output circuits built with discrete components. Although these circuits can achieve high and low level outputs, they often struggle to generate the required high-impedance state easily and reliably, or they introduce additional control devices to achieve the high-impedance state, increasing circuit complexity and cost. Summary of the Invention

[0004] The embodiments of the present invention provide a control guidance circuit for multi-state output, an on-board charger system and control method, which aims to solve the problems of high cost and complex peripheral circuits in the existing electric vehicle on-board charger, which uses dedicated integrated circuits or complex level conversion and drive circuits. Although the functions are complete, they are also used in the electric vehicle on-board charger.

[0005] In a first aspect, embodiments of the present invention provide a multi-state output control guidance circuit connected to a control chip in an on-board charger system. The circuit includes a first signal input terminal, a second signal input terminal, a first switch assembly, a second switch assembly, a third switch device, and a signal output terminal. One end of the first signal input terminal is connected to the control chip, and the other end is connected to the second switch assembly, which is also connected to the signal output terminal. One end of the second signal input terminal is connected to the control chip, and the other end is connected to the first switch assembly via the third switch device, which is also connected to the signal output terminal. Both the first and second signal input terminals are used to receive high-level, low-level, or high-impedance input signals output by the control chip. The first, second, and third switch assemblies are all used to open or close according to the received signals. The signal output terminal is used to output a three-state output signal according to the combination of the opening and closing of the first and second switch assemblies. The three-state output signal is one of a first-type output signal, a second-type output signal, or a high-impedance signal, wherein the first-type output signal and the second-type output signal are different output signals.

[0006] Secondly, embodiments of the present invention also provide an on-board charger system, which includes a multi-state output control guidance circuit as described in the first aspect above, wherein the input terminal of the multi-state output control guidance circuit is connected to a control chip, and the output terminal of the multi-state output control guidance circuit is connected to a charging connection device.

[0007] Thirdly, embodiments of the present invention also provide a control method for an on-board charger system, which is applied to the on-board charger system described in the second aspect above; the control method for the on-board charger system includes:

[0008] The control chip in the on-board charger system inputs a first input signal to the first signal input terminal of the multi-state output control guidance circuit, and inputs a second input signal to the second signal input terminal.

[0009] The first signal input terminal controls the opening or closing of the second switch component connected to the output terminal of the first signal input terminal in the control guidance circuit for multi-state output according to the first input signal. The second signal input terminal controls the opening or closing of the third switch device and the first switch component connected in sequence to the output terminal of the control guidance circuit for multi-state output according to the second input signal.

[0010] The signal output terminal of the control and guidance circuit for the multi-state output outputs a three-state output signal according to the combination of the opening or closing of the first switch component and the second switch component; wherein, the three-state output signal is one of the first type output signal, the second type output signal, or the high impedance state signal, and the first type output signal and the second type output signal are different output signals.

[0011] This invention provides a multi-state output control guidance circuit, an on-board charger system, and a control method. The multi-state output control guidance circuit includes a first signal input terminal, a second signal input terminal, a first switch assembly, a second switch assembly, a third switch device, and a signal output terminal. One end of the first signal input terminal is connected to a control chip, and the other end is connected to the second switch assembly, which is also connected to the signal output terminal. One end of the second signal input terminal is connected to the control chip, and the other end is connected to the first switch assembly via the third switch device, which is also connected to the signal output terminal. Both the first and second signal input terminals are used to receive high-level, low-level, or high-impedance input signals output by the control chip. The first, second, and third switch assemblies are all used to open or close accordingly based on the received signals. This invention detects the open or closed combination of the first and second switch assemblies through the signal output terminal and outputs a three-state output signal accordingly. The circuit structure is simple, reducing the material cost of the circuit, and it has good circuit stability and reliability. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A schematic block diagram of the structure of the control and guidance circuit for multi-state output provided in the embodiments of the present invention;

[0014] Figure 2 A schematic diagram of the circuit structure of the control guidance circuit for multi-state output provided in an embodiment of the present invention;

[0015] Figure 3 This is a schematic block diagram of the structure of an on-board charger system provided in an embodiment of the present invention;

[0016] Figure 4 A flowchart illustrating the control method of the on-board charger system provided in an embodiment of the present invention;

[0017] Figure 5This is a schematic diagram of a sub-process of the control method for an on-board charger system provided in an embodiment of the present invention;

[0018] Figure 6 This is another sub-flow diagram of the control method for the on-board charger system provided in an embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0023] Please also refer to Figure 1 and Figure 2 ,in Figure 1 This is a schematic block diagram of the control and guidance circuit for multi-state output provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the circuit structure of the control guidance circuit for multi-state output provided in an embodiment of the present invention. Figure 1 and Figure 2As shown, the multi-state output control guidance circuit is specifically connected to the control chip 100 in the on-board charger system. The multi-state output control guidance circuit includes a first signal input terminal 10, a second signal input terminal 20, a first switch assembly 30, a second switch assembly 40, a third switch device 50, and a signal output terminal 60. One end of the first signal input terminal 10 is connected to the control chip 100, and the other end is connected to the second switch assembly 40. The second switch assembly 40 is also connected to the signal output terminal 60. One end of the second signal input terminal 20 is connected to the control chip 100, and the other end is also connected to the first switch assembly 30 via the third switch device 50. The first switch assembly 30... 0 is also connected to the signal output terminal 60; the first signal input terminal 10 and the second signal input terminal 20 are both used to receive high-level, low-level or high-impedance input signals output by the control chip 100; the first switch assembly 30, the second switch assembly 40 and the third switch device 50 are all used to turn on or off according to the received signals; the signal output terminal 60 is used to output a three-state output signal according to the combination of the opening or closing of the first switch assembly 30 and the second switch assembly 40, the three-state output signal is one of the first type output signal, the second type output signal or the high-impedance signal, and the first type output signal and the second type output signal are different output signals.

[0024] In this embodiment, the control chip 100 is specifically implemented as a driver chip that satisfies tri-state output and can output 12V, such as a digital signal processing chip (i.e., a DPS chip), which can be located on the low-voltage side of the on-board charger system. Both the first signal input terminal 10 and the second signal input terminal 20 are used to receive high-level, low-level, or high-impedance input signals output by the control chip 100. The control chip 100 can control two synchronous and oppositely leveled input signals to be input to the first signal input terminal 10 and the second signal input terminal 20 respectively.

[0025] At the same time, if the first signal input terminal 10 receives a high-level control signal, the second switch component 40 is turned on; if the first signal input terminal 10 receives a low-level control signal, the second switch component 40 is turned off. If the second signal input terminal 20 receives a high-level control signal, the third switch device 50 is turned on and the first switch component 30 is turned on; if the second signal input terminal 20 receives a low-level control signal, the third switch device 50 is turned off and the first switch component 30 is turned off. When the first switch component 30 is on and the second switch component 40 is off, the signal output terminal 60 outputs a first-type output signal, which can correspond to a high level; when the first switch component 30 is off and the second switch component 40 is on, the signal output terminal 60 outputs a second-type output signal, which can correspond to a low level; when the first switch component 30 is off and the second switch component 40 is off, the signal output terminal 60 outputs a high-impedance signal. As can be seen, in this application, by using a specific combination of two input signals (both low level), the first switching component is reliably turned off by utilizing the turn-off of the third switching device. At the same time, the second switching component is also turned off because the input is low level. This dual turn-off mechanism achieves pure high-impedance output in a reliable manner through simple logic control, without the need to add additional complex circuitry.

[0026] In one embodiment, such as Figure 1 As shown, the first switch assembly 30 includes a first switch device 31 and a first power supply 32. The first power supply 32 is connected to the first switch device 31. The input terminal of the first switch device 31 is connected to the third switch device 50. The output terminal of the first switch device 31 is connected to the signal output terminal 60.

[0027] The second switching assembly 40 includes a second switching device 41 and a second power supply 42. The second power supply 42 is connected to the second switching device 41. The input terminal of the second switching device 41 is connected to the first signal input terminal 10, and the output terminal of the second switching device 41 is connected to the signal output terminal 60.

[0028] The first switching device 31, the first power supply 32, the second switching device 41, and the second power supply 42 constitute a push-pull output module.

[0029] In this embodiment, the first power supply 32 in the first switching assembly 30 outputs a high level (such as positive power supply voltage VCC) to the signal output terminal 60 when the first switching device 31 is turned on; the second power supply 42 in the second switching assembly 40 outputs a low level (such as ground potential) to the signal output terminal 60 when the second switching device 41 is turned on. Moreover, by using the four components—the first switching device 31, the first power supply 32, the second switching device 41, and the second power supply 42—a push-pull output circuit capable of reliably outputting three states (high level, low level, and high impedance state) is constructed at a relatively low implementation cost.

[0030] In one embodiment, such as Figure 1 and Figure 2 As shown, the first switching device is a PNP transistor, the second switching device is an NPN transistor, and the third switching device is an NMOS field-effect transistor.

[0031] In this embodiment, the first switching device 31 is a PNP transistor and in Figure 2 In the diagram, Q1 is used to represent the second switching device 41, which is an NPN transistor and is... Figure 2 In the diagram, Q2 is used to represent the third switching device 50, which is an NMOS field-effect transistor and is used in... Figure 2 Q3 is used to represent this. It is evident that this application employs a circuit structure entirely built from discrete components (transistors, MOSFETs, power supplies, etc.). These components are all general-purpose, inexpensive standard parts, eliminating the need for expensive dedicated chips, thus significantly reducing material and production costs. In specific implementations, the first switching device 31 can also be a PMOS field-effect transistor, and the second switching device 41 can also be an NMOS field-effect transistor.

[0032] In one embodiment, such as Figure 1 and Figure 2 As shown, the collector of the first switching device 31 is connected to the signal output terminal 60, the base of the first switching device 31 is connected to the drain of the third switching device 50, and the emitter of the first switching device 31 is connected to the first power supply 32; the collector of the second switching device 41 is connected to the signal output terminal 60, the emitter of the second switching device 41 is connected to the second power supply 42, and the base of the second switching device 41 is connected to the first signal input terminal 10; the gate of the third switching device 50 is connected to the second signal input terminal 20.

[0033] In this embodiment, the emitter of the first switching device 31 is connected to the first power supply 32 (e.g., a positive power supply), and its collector is the output terminal responsible for outputting a high level. The emitter of the second switching device 41 is connected to the second power supply 42 (e.g., ground), and its collector, along with the collector of the first switching device 31, is connected to the signal output terminal 60 and responsible for outputting a low level. The third switching device 50 acts as a driver device; its gate is controlled by the second signal input terminal 20, its drain is connected to the base of the first switching device 31, and its source is grounded through a resistor. The third switching device 50 controls the on / off state of the first switching device 31.

[0034] In one embodiment, such as Figure 1 and Figure 2 As shown, the control guidance circuit for the multi-state output further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The first end of the first resistor R1 is connected to the second signal input terminal 20, and the second end of the first resistor R1 is connected to the gate of the third switching device 50. The second end of the first resistor R1 is also grounded through the third resistor R3. The first end of the second resistor R2 is connected to the first signal input terminal 10, and the second end of the second resistor R2 is connected to the base of the second switching device 41. The second end of the second resistor R2 is also grounded through the sixth resistor R6. The first end of the fourth resistor R4 is connected to the drain of the third switching device 50, and the second end of the fourth resistor R4 is connected to the emitter of the first switching device 31. The first end of the fifth resistor R5 is connected to the source of the third switching device 50, and the second end of the fifth resistor R5 is grounded.

[0035] In this embodiment, the six resistors constitute a crucial control, pull-up, pull-down, and current-limiting network. This ensures that the switching devices can be accurately and reliably driven to a fully on or fully off state when the input signal is high, low, or in a high-impedance state, avoiding uncontrollable situations caused by floating inputs. Furthermore, the third resistor R3, the fourth resistor R4, and the sixth resistor R6 in the resistor network provide clear pull-down or pull-up paths for the control terminals of the switching devices. This ensures that when the signal input is low or in a high-impedance state, the corresponding switching devices are forcibly turned off, preventing malfunctions caused by input interference or floating, and greatly improving the stability and reliability of the circuit.

[0036] In one embodiment, such as Figure 1 and Figure 2As shown, if the first signal input terminal 10 is at a low level and the second signal input terminal 20 is at a high level, then the third switching device 50 is turned on, the first switching component 30 is turned on and the second switching component 40 is turned off, and the signal output terminal 60 outputs a first type of output signal and is at a corresponding high level.

[0037] If the first signal input terminal 10 is at a high level and the second signal input terminal 20 is at a low level, then the third switching device 50 is turned off, the first switching component 30 is turned off and the second switching component 40 is turned on, and the signal output terminal 60 outputs a second type of output signal and is at a low level.

[0038] If the first signal input terminal 10 is at a low level and the second signal input terminal 20 is at a low level, then the third switching device 50 is turned off, the first switching component 30 is turned off and the second switching component 40 is turned off, and the signal output terminal 60 outputs a high-impedance signal.

[0039] In this embodiment, a flexible control interface is provided through two independent input signals. By outputting specific combinations of digital signals through the PWM peripheral of the control chip or the two general-purpose I / O ports, the three output states can be precisely controlled. Moreover, in addition to outputting complementary signals, the control chip also retains a dead-time control strategy (wherein, when generating complementary signals for driving the upper and lower switches in the bridge circuit, the control chip does not perform an ideal, delay-free instantaneous toggle, but actively inserts a preset, short delay time between when one switch is commanded to turn off and when the other switch is commanded to turn on; this delay time is the dead time), further avoiding the risk of simultaneous conduction of the upper and lower switches during state transitions, thus improving circuit safety.

[0040] As can be seen, the circuit in this embodiment detects the open or closed combination of the first and second switch components through the signal output terminal and outputs a three-state output signal accordingly. The circuit structure is simple, reduces the material cost of the circuit, and has good circuit stability and reliability.

[0041] This invention also provides an on-board charger system, still referring to... Figure 1 And at the same time refer to Figure 3 The on-board charger system includes a multi-state output control guidance circuit as described in any of the foregoing embodiments. The input terminal of the multi-state output control guidance circuit is connected to the control chip 100, and the output terminal of the multi-state output control guidance circuit is connected to the charging connection device 200.

[0042] In this embodiment, as Figure 1 and Figure 3As shown, the charging connection device can be a charging gun, vehicle socket, etc. One end of the charging connection device 200 in the on-board charger system is connected to the output end of the multi-state output control guidance circuit, and the other end is connected to other electric vehicles. When the electric vehicle corresponding to the on-board charger system charges the other electric vehicle connected to the charging connection device 200, the control chip 100 will continuously send high and low levels to communicate or set the charging current.

[0043] When the control chip 100 sends an input signal to the first signal input terminal 10 or the second signal input terminal 20 in the multi-state output control guidance circuit, the PWM duty cycle of the input signal affects the maximum charging current of the charging connection device 200. Specifically, if the PWM duty cycle of the input signal is <3%, the charging connection device 200 is not allowed to charge other connected electric vehicles; if 3% ≤ PWM duty cycle of the input signal ≤ 7%, then when the PWM duty cycle of the input signal is 5%, digital communication is required and must be established between the electric vehicle corresponding to the on-board charger system and other electric vehicles connected to the charging connection device 200 before energy transmission. If there is no digital communication, charging is not allowed; if 7% < PWM duty cycle of the input signal < 8%, the charging connection device 200 is not allowed to charge other connected electric vehicles; if 8% ≤ PWM duty cycle of the input signal < 10%, then the maximum charging current of the charging connection device 200 is 6A; if 10% ≤ PWM duty cycle of the input signal ≤ 85%, then the maximum charging current is determined by multiplying the PWM duty cycle of the input signal by 60.

[0044] More specifically, the control chip 100 is implemented using a driver chip that satisfies tri-state output and can output 12V, such as a digital signal processing chip (i.e., a DPS chip), which can be located on the low-voltage side of the on-board charger system. Both the first signal input terminal 10 and the second signal input terminal 20 are used to receive high-level, low-level, or high-impedance input signals output by the control chip 100. The control chip 100 can control two synchronous and oppositely leveled input signals to be input to the first signal input terminal 10 and the second signal input terminal 20 respectively. At the same time, if the first signal input terminal 10 receives a high-level control signal, the second switch component 40 is turned on; if the first signal input terminal 10 receives a low-level control signal, the second switch component 40 is turned off. If the first switch component 30 is turned off and the second switch component 40 is turned on, the signal output terminal 60 outputs a second type of output signal, which can correspond to a low level; if the first switch component 30 is turned off and the second switch component 40 is turned off, the signal output terminal 60 outputs a high-impedance signal. As can be seen, in this application, by using a specific combination of two input signals (both low level), the first switching component is reliably turned off by utilizing the turn-off of the third switching device. At the same time, the second switching component is also turned off because the input is low level. This dual turn-off mechanism achieves pure high-impedance output in a reliable manner through simple logic control, without the need to add additional complex circuitry.

[0045] This invention also provides a control method for an on-board charger system, such as... Figure 4 The diagram shown is a flowchart illustrating a control method for an on-board charger system provided in an embodiment of the present invention. The control method for the on-board charger system is applied to the on-board charger system described in any of the foregoing embodiments, such as... Figure 4 As shown, the control method of the on-board charger system provided by the present invention includes steps S110 to S130.

[0046] S110, the control chip in the on-board charger system respectively inputs the first input signal to the first signal input terminal in the multi-state output control guidance circuit, and inputs the second input signal to the second signal input terminal;

[0047] S120. The first signal input terminal controls the opening or closing of the second switch component connected to the output terminal of the first signal input terminal in the control guidance circuit for multi-state output according to the first input signal. The second signal input terminal controls the opening or closing of the third switch device and the first switch component connected in sequence to the output terminal of the control guidance circuit for multi-state output according to the second input signal.

[0048] S130, the signal output terminal of the control and guidance circuit of the multi-state output output outputs a three-state output signal according to the opening or closing combination of the first switch component and the second switch component; wherein, the three-state output signal is one of the first type output signal, the second type output signal or the high impedance state signal, and the first type output signal and the second type output signal are different output signals.

[0049] In this embodiment, reference may also be made to Figures 1-3 In a specific implementation, the control chip 100 employs a driver chip that satisfies tri-state output and can output 12V, such as a digital signal processing chip (DPS chip), which can be located on the low-voltage side of the on-board charger system. Both the first signal input terminal 10 and the second signal input terminal 20 are used to receive high-level, low-level, or high-impedance input signals output by the control chip 100. The control chip 100 can control two synchronous and oppositely leveled input signals to be input to the first signal input terminal 10 and the second signal input terminal 20 respectively.

[0050] At the same time, if the first signal input terminal 10 receives a high-level control signal, the second switch component 40 is turned on; if the first signal input terminal 10 receives a low-level control signal, the second switch component 40 is turned off. If the second signal input terminal 20 receives a high-level control signal, the third switch device 50 is turned on and the first switch component 30 is turned on; if the second signal input terminal 20 receives a low-level control signal, the third switch device 50 is turned off and the first switch component 30 is turned off. When the first switch component 30 is on and the second switch component 40 is off, the signal output terminal 60 outputs a first-type output signal, which can correspond to a high level; when the first switch component 30 is off and the second switch component 40 is on, the signal output terminal 60 outputs a second-type output signal, which can correspond to a low level; when the first switch component 30 is off and the second switch component 40 is off, the signal output terminal 60 outputs a high-impedance signal. As can be seen, in this application, by using a specific combination of two input signals (both low level), the first switching component is reliably turned off by utilizing the turn-off of the third switching device. At the same time, the second switching component is also turned off because the input is low level. This dual turn-off mechanism achieves pure high-impedance output in a reliable manner through simple logic control, without the need to add additional complex circuitry.

[0051] In one embodiment, such as Figure 5 As shown, step S120 includes:

[0052] S121. If the first signal input terminal is at a low level and the second signal input terminal is at a high level, then control the third switching device to turn on, the first switching component to turn on, and the second switching component to turn off.

[0053] S122. If the first signal input terminal is at a high level and the second signal input terminal is at a low level, then control the third switching device to turn off, the first switching component to turn off, and the second switching component to turn on.

[0054] S123. If the first signal input terminal is at a low level and the second signal input terminal is at a low level, then control the third switching device to turn off, the first switching component to turn off, and the second switching component to turn off.

[0055] In this embodiment, reference is also made to Figures 1-3 The third switching device 50 controls the on / off state of the first switching device 31. When the third switching device 50 is on, the first switching device 31 is also on; when the third switching device 50 is off, the first switching device 31 is also off. The first power supply 32 in the first switching assembly 30 outputs a high level (e.g., positive power supply voltage VCC) to the signal output terminal 60 when the first switching device 31 is on. The second power supply 42 in the second switching assembly 40 outputs a low level (e.g., ground potential) to the signal output terminal 60 when the second switching device 41 is on. Furthermore, using these four components—the first switching device 31, the first power supply 32, the second switching device 41, and the second power supply 42—a push-pull output circuit capable of reliably outputting three states (high level, low level, and high impedance) is constructed at a relatively low implementation cost.

[0056] In one embodiment, such as Figure 6 As shown, step S130 includes:

[0057] S131. If the first switch component is turned on and the second switch component is turned off, the signal output terminal outputs a first type of output signal and a corresponding high level.

[0058] S132. If the first switch component is off and the second switch component is on, the signal output terminal outputs a second type of output signal and a corresponding low level.

[0059] S133. If the first switching component is turned off and the second switching component is turned off, then the signal output terminal outputs a high-impedance signal.

[0060] In this embodiment, specifically, if the first signal input terminal 10 is at a low level and the second signal input terminal 20 is at a high level, then the third switching device 50 is turned on, the first switching component 30 is turned on, and the second switching component 40 is turned off, and the signal output terminal 60 outputs a first type of output signal with a corresponding high level; if the first signal input terminal 10 is at a high level and the second signal input terminal 20 is at a low level, then the third switching device 50 is turned off, the first switching component 30 is turned off, and the second switching component 40 is turned on, and the signal output terminal 60 outputs a second type of output signal with a corresponding low level; if the first signal input terminal 10 is at a low level and the second signal input terminal 20 is at a low level, then the third switching device 50 is turned off, the first switching component 30 is turned off, and the second switching component 40 is turned off, and the signal output terminal 60 outputs a high-impedance signal.

[0061] The control chip provides a flexible control interface through two independent input signals. By outputting specific combinations of digital signals through the PWM peripheral of the control chip or the two general-purpose I / O ports, the three output states can be precisely controlled. Moreover, in addition to outputting complementary signals, the control chip also retains a dead-time control strategy, further avoiding the risk of simultaneous conduction of the upper and lower transistors during state transitions, thus improving circuit safety.

[0062] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0063] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of each unit is merely a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0064] The steps in the method of this invention can be adjusted, merged, or reduced in order according to actual needs. The units in the device of this invention can be merged, divided, or reduced according to actual needs. Furthermore, the functional units in the various embodiments of this invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0065] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a terminal, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention.

[0066] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-state output control guidance circuit, connected to a control chip in an on-board charger system, characterized in that, include: The system comprises a first signal input terminal, a second signal input terminal, a first switch assembly, a second switch assembly, a third switch device, and a signal output terminal. One end of the first signal input terminal is connected to the control chip, and the other end is connected to the second switch assembly, which is also connected to the signal output terminal. One end of the second signal input terminal is connected to the control chip, and the other end is also connected to the first switch assembly via the third switch device, which is also connected to the signal output terminal. Both the first and second signal input terminals are used to receive high-level, low-level, or high-impedance input signals output by the control chip. The control chip outputs synchronous and opposite-level input signals to the first and second signal input terminals. The control chip is configured with a dead time. The first switch assembly, the second switch assembly, and the third switch device are all used to open or close accordingly based on the received signal; the signal output terminal is used to output a three-state output signal according to the opening or closing combination of the first switch assembly and the second switch assembly. The three-state output signal is one of a first type output signal, a second type output signal, or a high-impedance state signal. The first type output signal and the second type output signal are different output signals. The first switching assembly includes a first switching device and a first power supply. The first power supply is connected to the first switching device, the input terminal of the first switching device is connected to the third switching device, and the output terminal of the first switching device is connected to the signal output terminal. The second switching assembly includes a second switching device and a second power supply. The second power supply is connected to the second switching device, the input terminal of the second switching device is connected to the first signal input terminal, and the output terminal of the second switching device is connected to the signal output terminal. The first switching device, the first power supply, the second switching device, and the second power supply constitute a push-pull output module. The first switching device is a PNP transistor, the second switching device is an NPN transistor, and the third switching device is an NMOS field-effect transistor.

2. The control and guidance circuit for multi-state output according to claim 1, characterized in that, The collector of the first switching device is connected to the signal output terminal, the base of the first switching device is connected to the drain of the third switching device, and the emitter of the first switching device is connected to the first power supply; the collector of the second switching device is connected to the signal output terminal, the emitter of the second switching device is connected to the second power supply, and the base of the second switching device is connected to the first signal input terminal; the gate of the third switching device is connected to the second signal input terminal.

3. The control and guidance circuit for multi-state output according to claim 2, characterized in that, It also includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor; the first end of the first resistor is connected to the second signal input terminal, the second end of the first resistor is connected to the gate of the third switching device, and the second end of the first resistor is also grounded through the third resistor; the first end of the second resistor is connected to the first signal input terminal, the second end of the second resistor is connected to the base of the second switching device, and the second end of the second resistor is also grounded through the sixth resistor; the first end of the fourth resistor is connected to the drain of the third switching device, and the second end of the fourth resistor is connected to the emitter of the first switching device; the first end of the fifth resistor is connected to the source of the third switching device, and the second end of the fifth resistor is grounded.

4. The control and guidance circuit for multi-state output according to any one of claims 1-3, characterized in that, If the first signal input terminal is low and the second signal input terminal is high, then the third switching device is turned on, the first switching component is turned on, and the second switching component is turned off, and the signal output terminal outputs a first type of output signal with a corresponding high level; if the first signal input terminal is high and the second signal input terminal is low, then the third switching device is turned off, the first switching component is turned off, and the second switching component is turned on, and the signal output terminal outputs a second type of output signal with a corresponding low level; if the first signal input terminal is low and the second signal input terminal is low, then the third switching device is turned off, the first switching component is turned off, and the second switching component is turned off, and the signal output terminal outputs a high-impedance signal.

5. An on-board charger system, characterized in that, The system includes a control and guidance circuit with multi-state output as described in any one of claims 1-4, wherein the input terminal of the control and guidance circuit with multi-state output is connected to a control chip, and the output terminal of the control and guidance circuit with multi-state output is connected to a charging connection device.

6. A control method for an on-board charger system, applied to the on-board charger system as described in claim 5, characterized in that, The control method for the on-board charger system includes: The control chip in the on-board charger system inputs a first input signal to the first signal input terminal of the multi-state output control guidance circuit, and inputs a second input signal to the second signal input terminal; the control chip outputs synchronous and opposite level input signals to the first signal input terminal and the second signal input terminal, and the control chip is configured with a dead time; The first signal input terminal controls the opening or closing of the second switch component connected to the output terminal of the first signal input terminal in the control guidance circuit for multi-state output according to the first input signal. The second signal input terminal controls the opening or closing of the third switch device and the first switch component connected in sequence to the output terminal of the control guidance circuit for multi-state output according to the second input signal. The signal output terminal of the control and guidance circuit for the multi-state output outputs a three-state output signal according to the combination of the opening or closing of the first switch component and the second switch component; wherein, the three-state output signal is one of the first type output signal, the second type output signal, or the high impedance state signal, and the first type output signal and the second type output signal are different output signals.

7. The control method for the on-board charger system according to claim 6, characterized in that, The first signal input terminal controls the opening or closing of the second switch assembly connected to the output terminal of the first signal input terminal in the control guidance circuit corresponding to the first input signal, and the second signal input terminal controls the opening or closing of the third switch device and the first switch assembly sequentially connected to the output terminal of the second signal input terminal in the control guidance circuit corresponding to the second input signal, including: If the first signal input terminal is low and the second signal input terminal is high, then the third switching device is turned on, the first switching assembly is turned on and the second switching assembly is turned off. If the first signal input terminal is at a high level and the second signal input terminal is at a low level, then the third switching device is turned off, the first switching assembly is turned off, and the second switching assembly is turned on. If the first signal input terminal is at a low level and the second signal input terminal is at a low level, then the third switching device, the first switching assembly, and the second switching assembly are controlled to turn off.

8. The control method for the on-board charger system according to claim 6, characterized in that, The signal output terminal of the multi-state output control guidance circuit outputs a three-state output signal according to the open or closed combination of the first and second switching components, including: If the first switch component is turned on and the second switch component is turned off, the signal output terminal outputs a first type of output signal with a corresponding high level; if the first switch component is turned off and the second switch component is turned on, the signal output terminal outputs a second type of output signal with a corresponding low level. If the first switching component is turned off and the second switching component is turned off, the signal output terminal outputs a high-impedance signal.

Images