Intelligent ignition circuit

Abstract

The invention relates to the technical field of integrated circuits, and discloses an intelligent ignition circuit, which comprises a control circuit, a switching circuit and an ignition main loop, and is characterized in that before ignition current is not input into the ignition main loop, the control circuit inputs preset current into the ignition main circuit by controlling the on-off state of the switching circuit; the control circuit calculates the line resistance of the ignition main loop based on the voltage of the first input end of the switching circuit and the preset current; after the ignition current is input into the ignition main loop, the control circuit dynamically controls the voltage of the first output end of the ignition main loop to reach the ignition voltage corresponding to the ignition current by utilizing a feedback closed-loop control method based on the line resistance, the ignition current and the voltage of the first output end of the ignition main loop; therefore, the voltage of the first output end of the ignition main loop is stable, and the reliability of the ignition circuit is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and in particular to an intelligent ignition circuit. Background Art

[0002] Existing ignition circuits for rockets or missiles are as follows Figure 1 As shown, the power supply VCC, switch SW1, Rx, Rw and Rd constitute an ignition circuit, where Rd is the internal resistance of the ignition head, Rw is the wire resistance, If is the ignition current, and VCC is the power supply voltage. During design, the current limiting resistor value Rx is calculated according to the formula Rx = [VCC-(Rw+Rd)*If] / If. When the switch SW1 is closed, the ignition circuit is connected and the ignition head Rd is ignited.

[0003] and Figure 1 The ignition circuit shown has the following disadvantages:

[0004] (1) When the power supply voltage VCC fluctuates, the ignition current also fluctuates, which is not conducive to the reliability of the ignition circuit;

[0005] (2) The current limiting resistor value Rx must be determined after the wire resistance value of the electrical system is determined, which makes it impossible to carry out the work in parallel, affecting the development cycle of related projects;

[0006] (3) Rw and Rd of different electrical systems are different, so the calculated current limiting resistor Rx value will also be different, which will lead to an increase in the types of materials, which is not conducive to enterprise inventory management and cost control. Summary of the invention

[0007] In view of this, the present invention provides an intelligent ignition circuit to solve the problem of how to maintain the stability of the ignition current.

[0008] The present invention provides an intelligent ignition circuit, comprising: a control circuit, a switch circuit and an ignition main circuit, wherein the control circuit has a first input end connected to the input end of the ignition main circuit, a second input end connected to the first input end of the switch circuit, a second output end connected to the first input end of the switch circuit, a third input end connected to the first output end of the ignition main circuit, a first output end connected to the control end of the switch circuit, and a third output end connected to the control end of the ignition main circuit; the switch circuit has a second input end connected to the first output end of the ignition main circuit, and an output end connected to the second input end of the ignition main circuit; before the ignition main circuit is input with an ignition current, the control circuit controls the on-off state of the switch circuit to input a preset current to the ignition main circuit, and the control circuit calculates the line resistance of the ignition main circuit based on the voltage at the first input end of the switch circuit and the preset current; after the ignition main circuit is input with an ignition current, the control circuit dynamically controls the voltage at the first output end of the ignition main circuit to reach the ignition voltage corresponding to the ignition current based on the line resistance, the ignition current and the voltage at the first output end of the ignition main circuit, using a feedback closed-loop control method.

[0009] In the present invention, before the ignition current is input into the ignition main circuit, the control circuit inputs a preset current into the ignition main circuit by controlling the on-off state of the switch circuit. The control circuit calculates the line resistance of the ignition main circuit based on the voltage at the first input end of the switch circuit and the preset current. Therefore, a current limiting resistor is not required. Before the line resistance of the electrical system is determined, the application design of the circuit can be started, which can speed up the progress of related projects.

[0010] After the ignition current is input into the ignition main circuit, the control circuit of the present invention dynamically controls the voltage of the first output end of the ignition main circuit to reach the ignition voltage corresponding to the ignition current based on the line resistance, the ignition current and the voltage of the first output end of the ignition main circuit by using a feedback closed-loop control method, thereby achieving voltage stability at the first output end of the ignition main circuit and further improving the reliability of the ignition circuit.

[0011] In an optional embodiment, the control circuit includes: a current source and a control module, wherein the current source has an input terminal inputting a preset voltage and an output terminal connected to a first input terminal of a switching circuit, and is used to convert the preset voltage into a preset current; a control module, a first input terminal connected to a first input terminal of the switching circuit, a second input terminal connected to a first output terminal of an ignition main circuit, a first output terminal connected to a control terminal of the switching circuit, and a second output terminal connected to a control terminal of the ignition main circuit, and is used to form a path for the current source to inject a preset current into the main ignition circuit by controlling the on-off state of the switching circuit, and calculate the line resistance of the ignition main circuit; based on the line resistance and the ignition current, a feedback closed-loop control method is used to dynamically control the voltage at the first output terminal of the ignition main circuit to reach the ignition voltage corresponding to the ignition current.

[0012] In an optional embodiment, the control module includes: a conditioning circuit, an analog-to-digital conversion circuit, an isolation circuit and a CPU circuit, wherein the conditioning circuit has a first input terminal connected to the first input terminal of the switching circuit, a second input terminal connected to the first output terminal of the ignition main circuit, and an output terminal connected to the input terminal of the analog-to-digital conversion circuit, and is used to perform signal conditioning on the voltage of the first input terminal of the switching circuit and the voltage of the first output terminal of the ignition main circuit; the analog-to-digital conversion circuit has an output terminal connected to the input terminal of the isolation circuit, and an output terminal connected to the input terminal of the isolation circuit, and is used to convert the analog signal of the voltage of the first input terminal of the switching circuit into a digital signal; the isolation circuit has an output terminal connected to the second input terminal of the CPU circuit, and is used for signal isolation; the CPU circuit has a first input terminal connected to the input terminal of the ignition main circuit, a first output terminal connected to the control terminal of the switching circuit, and a second output terminal connected to the control terminal of the ignition main circuit, and is used to calculate the line resistance of the ignition main circuit, and dynamically control the voltage of the first output terminal of the ignition main circuit to reach the ignition voltage corresponding to the ignition current.

[0013] In an optional implementation, the control module further includes: a serial port circuit, an input end of which is connected to the input end of the ignition main circuit, and an output end of which is connected to the first input end of the CPU circuit.

[0014] In an optional embodiment, the switching circuit includes: a first relay, a second relay, a first transistor and a second transistor, wherein the first relay has an input end connected to the second output end of the control circuit, an output end connected to the input end of the second relay and the second input end of the control circuit, a first power supply end inputs a power supply voltage, and a second power supply end is grounded through the first transistor; the second relay has a second input end connected to the first output end of the ignition main circuit, an output end connected to the second input end of the ignition main circuit, a first power supply end inputs a power supply voltage, and a second power supply end is grounded through the first transistor. The first triode is grounded; the control end of the first triode is connected to the first output end of the control circuit; the control end of the second triode is connected to the first output end of the control circuit; before the ignition current is input into the ignition main circuit, the control circuit controls the first triode and the second triode to be turned on, the input end of the first relay is connected to the output end thereof, and the first input end of the second relay is connected to the output end thereof; before the ignition current is input into the ignition main circuit, the control circuit controls the first triode to be turned off and the second triode to be turned on, the input end of the first relay is disconnected from the output end thereof, and the second input end of the second relay is connected to the output end thereof.

[0015] In an optional embodiment, the ignition main circuit includes: a drive circuit and a DC-DC circuit, wherein the drive circuit has an input end connected to the first output end of the control circuit, and an output end connected to the control end of the power device of the DC-DC circuit; the DC-DC circuit has a first input end that inputs the ignition current, a first output end that is connected to the second input end of the switching circuit, and a second input end that is connected to the output end of the switching circuit; after the DC-DC circuit inputs the ignition current, the control circuit dynamically controls the PWM duty cycle output by the drive circuit based on the line resistance and the ignition current by using a feedback closed-loop control method, so as to control the voltage at the first output end of the DC-DC circuit to reach the ignition voltage corresponding to the ignition current.

[0016] In an optional implementation, the drive circuit includes: an isolation drive chip, whose input terminal inputs the ignition current, whose first output terminal is connected to the second input terminal of the switch circuit, and whose second output terminal is connected to the output terminal of the switch circuit.

[0017] In an optional embodiment, the DC-DC circuit includes: a third transistor, a fourth transistor, a capacitor and an inductor, wherein the third transistor has a first end for inputting ignition current, a second end for connecting to the first end of the fourth transistor and the first end of the inductor, and a control end for connecting to the output end of the drive circuit; the fourth transistor has a second end for connecting to ground, and a control end for connecting to the output end of the drive circuit; the inductor has a second end for connecting to the first end of the capacitor, the second input end of the switch circuit, and the first output end of the ignition main circuit; the capacitor has a second end for connecting to the output end of the switch circuit, and a second end for connecting to ground.

[0018] In an optional implementation, the intelligent ignition circuit further includes: a controllable current source for generating an ignition current. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a specific circuit structure diagram of an ignition circuit in the related art;

[0021] Figure 2 is a composition diagram of an intelligent ignition circuit according to an embodiment of the present invention;

[0022] Figure 3 is a composition diagram of another intelligent ignition circuit according to an embodiment of the present invention;

[0023] Figure 4 is a specific circuit structure diagram of a conditioning circuit, a switch circuit, and an ignition main circuit according to an embodiment of the present invention;

[0024] Figure 5 is a specific circuit structure diagram of an analog-to-digital conversion circuit according to an embodiment of the present invention;

[0025] Figure 6 is a specific circuit structure diagram of an isolation circuit according to an embodiment of the present invention;

[0026] Figure 7 is a specific circuit structure diagram of a CPU circuit according to an embodiment of the present invention;

[0027] Figure 8 It is a specific circuit structure diagram of the serial port circuit of an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] In this embodiment, an intelligent ignition circuit is provided. Figure 2 As shown, it includes: a control circuit, a switch circuit and an ignition main circuit.

[0033] like Figure 2 As shown, the control circuit has a first input terminal connected to the input terminal of the ignition main circuit, a second input terminal connected to the first input terminal of the switch circuit, a second output terminal connected to the first input terminal of the switch circuit, a third input terminal connected to the first output terminal of the ignition main circuit, a first output terminal connected to the control terminal of the switch circuit, and a third output terminal connected to the control terminal of the ignition main circuit.

[0034] Optionally, the control circuit has a built-in current source and related control modules, and the current source can test Figure 1 The sum of Rw and Rd is Ro, and the control module can not only control the on-off state of the switch circuit, but also stabilize the current of the ignition main circuit according to the actual current, voltage and the sum Ro.

[0035] like Figure 2 As shown, the switch circuit has its second input end connected to the first output end of the ignition main circuit, and its output end connected to the second input end of the ignition main circuit.

[0036] Specifically, the switch circuit has a built-in controllable switch, and the conduction and closure of the controllable switch can form different current paths. For example, before the ignition current is input into the ignition main circuit, in order to measure the actual sum value Ro, the components of the ignition main circuit are partially cut out, so that the control circuit measures the line circuit of the ignition main circuit. After the ignition current is input into the ignition main circuit, the wire transfer main circuit is put into operation to achieve ignition.

[0037] Specifically, Figure 2 In the embodiment, before the ignition current is input into the ignition main circuit, the control circuit inputs a preset current into the ignition main circuit by controlling the on / off state of the switch circuit, and the control circuit calculates the line resistance of the ignition main circuit based on the voltage at the first input end of the switch circuit and the preset current. After the ignition current is input into the ignition main circuit, the control circuit dynamically controls the voltage at the first output end of the ignition main circuit to reach the ignition voltage corresponding to the ignition current based on the line resistance, the ignition current and the voltage at the first output end of the ignition main circuit using a feedback closed-loop control method.

[0038] Specifically, before the ignition current is input into the ignition main circuit, the main circuit is cut out, and the control circuit injects the preset current Is. The control module measures the voltage drop Uo generated after the preset current Is flows through Ro. The control module knows Ro according to the formula Ro=Uo÷Is. Then the control circuit calculates the required ignition main circuit output voltage setting value Ud according to the actual required ignition current If through the formula Ud=If×Ro. The control circuit adjusts the PWM pulse width of the power device of the ignition main circuit according to the voltage setting value Ud and the measured value of the ignition main circuit input voltage, and detects the actual value U3 of the ignition main circuit output voltage, forming negative feedback so that U3 reaches the set value Ud.

[0039] In some optional embodiments, such as Figure 3 As shown, the control circuit includes: a current source and a control module.

[0040] like Figure 3 As shown, the current source has an input terminal inputting a preset voltage and an output terminal connected to a first input terminal of the switch circuit, and is used to convert the preset voltage into a preset current.

[0041] like Figure 3 As shown, the control module has a first input terminal connected to the first input terminal of the switch circuit, a second input terminal connected to the first output terminal of the ignition main circuit, a first output terminal connected to the control terminal of the switch circuit, and a second output terminal connected to the control terminal of the ignition main circuit. The control module is used to form a path for a current source to inject a preset current into the main ignition circuit by controlling the on-off state of the switch circuit, and calculate the line resistance of the ignition main circuit; based on the line resistance and the ignition current, a feedback closed-loop control method is used to dynamically control the voltage of the first output terminal of the ignition main circuit to reach the ignition voltage corresponding to the ignition current.

[0042] Optionally, the feedback closed-loop control may include PID control, but this is only an example and not a limitation.

[0043] In some optional implementations, the control module includes: a conditioning circuit, an analog-to-digital conversion circuit, an isolation circuit and a CPU circuit.

[0044] Specifically, the conditioning circuit has a first input terminal connected to the first input terminal of the switching circuit, a second input terminal connected to the first output terminal of the ignition main circuit, and an output terminal connected to the input terminal of the analog-to-digital conversion circuit, and is used to perform signal conditioning on the voltage of the first input terminal of the switching circuit and the voltage of the first output terminal of the ignition main circuit.

[0045] Optionally, the conditioning circuit consists of Figure 4The chip yU1, resistor yR2, resistor yR3, resistor yR4, resistor yR5, resistor yR6, resistor yR7, resistor yR10, capacitor yC1, capacitor yC6, capacitor yC7, capacitor yC10 and capacitor yC11 are composed of, among which, resistor yR2, resistor yR4 and capacitor yC6 are used for recovering the first input terminal voltage (i.e. U1) of the switch circuit, and resistor yR6, resistor yR7 and capacitor yC11 are used for recovering the first output terminal voltage (i.e. U3) of the ignition main circuit.

[0046] Specifically, the analog-to-digital conversion circuit, whose output end is connected to the input end of the isolation circuit, is used to convert the analog signal of the voltage at the first input end of the switch circuit into a digital signal.

[0047] Optionally, the analog-to-digital conversion circuit is composed of Figure 5 The chip yU2 converts the analog signal into a digital signal and sends it to the isolation circuit.

[0048] Specifically, the isolation circuit, whose output terminal is connected to the second input terminal of the CPU circuit, is used for signal isolation.

[0049] Optionally, the specific circuit structure of the isolation circuit is as follows: Figure 6 As shown, pins 11, 12, 13 and 14 of chip yU3 are connected to pins 15, 14, 16 and 1 of chip yU2 respectively.

[0050] Specifically, the CPU circuit has a first input terminal connected to the input terminal of the ignition main circuit, a first output terminal connected to the control terminal of the switch circuit, and a second output terminal connected to the control terminal of the ignition main circuit. It is used to calculate the line resistance of the ignition main circuit and dynamically control the voltage of the first output terminal of the ignition main circuit to reach the ignition voltage corresponding to the ignition current.

[0051] Optionally, the specific circuit structure of the CPU circuit is as follows: Figure 7 As shown, the Y9 pin, Y8 pin, V8 pin, and W8 pin of chip U1B are connected to the 6 pin, 5 pin, 4 pin, and 3 pin of chip yU3 respectively.

[0052] In some optional implementations, the control module further includes: a serial port circuit, an input end of which is connected to the input end of the ignition main circuit, and an output end of which is connected to the first input end of the CPU circuit.

[0053] Optionally, the specific circuit structure of the serial port circuit is as follows: Figure 8 As shown, pins 3 and 6 of chip yU4 are connected to pins V5 and U7 of chip U1B respectively.

[0054] In some optional embodiments, such as Figure 4 As shown, the switch circuit includes: a first relay (ie K1), a second relay (ie K2), a first transistor (ie Q1) and a second transistor (ie Q4).

[0055] like Figure 4 As shown, the first relay, whose input end is connected to the second output end of the control circuit (i.e., input 24V+ voltage), whose output end is connected to the input end of the second relay and the second input end of the control circuit (i.e., resistor yR2), whose first power supply end inputs the power supply voltage (i.e., 3.3VD), and whose second power supply end is grounded through the first transistor; the second relay, whose second input end is connected to the first output end of the ignition main circuit (i.e., inductor L2), whose output end is connected to the second input end of the ignition main circuit (i.e., capacitor C2), whose first power supply end inputs the power supply voltage (i.e., 3.3VD), and whose second power supply end is grounded through the first transistor; the first transistor, whose control end is connected to the first output end of the control circuit (i.e., pin W10 of chip U1B); the second transistor, whose control end is connected to the first output end of the control circuit (i.e., pin V6 of chip U1B).

[0056] Specifically, before the ignition current is input into the ignition main circuit, the control circuit controls the first transistor and the second transistor to be turned on, the input end of the first relay is connected to its output end, and the first input end of the second relay is connected to its output end; before the ignition current is input into the ignition main circuit, the control circuit controls the first transistor to be turned off and the second transistor to be turned on, the input end of the first relay is disconnected from its output end, and the second input end of the second relay is connected to its output end.

[0057] Specifically, refer to Figure 4 , 24V is used to generate a 10mA current source through a 2.4K resistor, XC7Z020 controls Q1 to drive the contacts on relay K1 to turn on, controls Q4 to drive the contacts on relay K2 to turn on, 10mA current flows through the two relays, and then forms a loop through the connecting wire and the ignition head. The voltage U1 is sent to yU2 for AD conversion after passing through the conditioning circuit composed of yU1 as the core. The converted digital signal is sent to XC7Z020 for calculation after passing through the isolation chip, that is, U1÷10mA=Ro. Assuming U1 is 50mV, Ro=5 ohms.

[0058] In some optional implementations, the main ignition circuit includes: a drive circuit and a DC-DC circuit.

[0059] Specifically, the drive circuit has an input end connected to the first output end of the control circuit, and an output end connected to the control end of the power device of the DC-DC circuit; the DC-DC circuit has a first input end that inputs an ignition current, a first output end connected to the second input end of the switching circuit, and a second input end connected to the output end of the switching circuit.

[0060] Specifically, after the ignition current is input into the DC-DC circuit, the control circuit dynamically controls the PWM duty cycle output by the drive circuit based on the line resistance and the ignition current using a feedback closed-loop control method to control the voltage at the first output terminal of the DC-DC circuit to reach the ignition voltage corresponding to the ignition current.

[0061] Optionally, the DC-DC circuit may be a BUCK circuit, a BOOST circuit, a BUCK-BOOST circuit, a CUK circuit, etc., which is not limited here.

[0062] In some optional embodiments, the drive circuit includes: an isolation drive chip, whose input terminal inputs the ignition current, whose first output terminal is connected to the second input terminal of the switch circuit, and whose second output terminal is connected to the output terminal of the switch circuit.

[0063] Optionally, the specific circuit structure of the driving circuit is composed of Figure 4 The isolation driving chip zU1, resistor zR1, resistor zR2, resistor zR3, resistor yR21, capacitor zC1, capacitor zC2, capacitor zC3, capacitor zC4, capacitor zC5, capacitor zCf1 and diode zD1 are composed. The isolation driving chip zU1 receives the driving signal of the control circuit and performs voltage conversion to obtain a driving voltage, and the driving voltage drives the power devices in the DC-DC circuit.

[0064] In some optional embodiments, such as Figure 4 As shown, the DC-DC circuit includes: a third transistor (i.e., Q2), a fourth transistor (i.e., Q3), a capacitor (i.e., C2) and an inductor (i.e., L2), wherein the third transistor has a first end for inputting ignition current, a second end connected to the first end of the fourth transistor and the first end of the inductor, and a control end connected to the output end of the drive circuit; the fourth transistor has a second end connected to ground, and a control end connected to the output end of the drive circuit; the inductor has a second end connected to the first end of the capacitor, the second input end of the switch circuit, and the first output end of the ignition main circuit; the capacitor has a second end connected to the output end of the switch circuit, and a second end also connected to ground.

[0065] Optionally, Figure 4 The DC-DC circuit in the description only takes the BUCK circuit as an example, but this is only an example and is not intended to be limiting.

[0066] Specifically, the user sets the ignition current through the serial port circuit composed of yU4. Assuming it is 5A, the target voltage of U3 is 25V. XC7Z020 calculates the PWM wave duty cycle that should be output based on VCC and the target voltage, and outputs it to the isolated gate driver chip through the V11 and V10 pins, thereby driving the synchronous buck circuit composed of Q2, Q3, L2, and C2 to make its output U3 reach the target value of 25V. The AD conversion circuit composed of yU1 and yU2 collects data on U3 in real time, and fine-tunes the PWM duty cycle according to the error between the collected value and the target value of 25V until the output accuracy is achieved.

[0067] In some optional implementations, the intelligent ignition circuit further includes: a controllable current source, which is used to generate an ignition current. Optionally, the controllable current source can be a programmable current source, a switching power supply, and the like.

[0068] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An intelligent ignition circuit, characterized in that: include: Control circuit, switch circuit and ignition main circuit, among which, A control circuit, wherein a first input end thereof is connected to an input end of the ignition main circuit, a second input end thereof is connected to a first input end of the switch circuit, a second output end thereof is connected to a first input end of the switch circuit, a third input end thereof is connected to a first output end of the ignition main circuit, a first output end thereof is connected to a control end of the switch circuit, and a third output end thereof is connected to a control end of the ignition main circuit; a switch circuit, wherein the second input terminal of the switch circuit is connected to the first output terminal of the ignition main circuit, and the output terminal of the switch circuit is connected to the second input terminal of the ignition main circuit; Before the ignition main circuit is not input with the ignition current, the control circuit controls the on-off state of the switch circuit to input a preset current into the ignition main circuit, and the control circuit calculates the line resistance of the ignition main circuit based on the voltage at the first input end of the switch circuit and the preset current; After the ignition current is input into the ignition main circuit, the control circuit dynamically controls the voltage of the first output end of the ignition main circuit to reach the ignition voltage corresponding to the ignition current based on the line resistance, the ignition current and the voltage of the first output end of the ignition main circuit using a feedback closed-loop control method.

2. The intelligent ignition circuit according to claim 1, characterized in that: The control circuit includes: a current source and a control module, wherein: a current source, whose input terminal is input with a preset voltage, whose output terminal is connected with the first input terminal of the switch circuit, and which is used to convert the preset voltage into a preset current; A control module, wherein a first input terminal is connected to a first input terminal of the switch circuit, a second input terminal is connected to a first output terminal of the ignition main circuit, a first output terminal is connected to a control terminal of the switch circuit, and a second output terminal is connected to a control terminal of the ignition main circuit. The control module is used to control the on-off state of the switch circuit to form a path for a current source to inject a preset current into the main ignition circuit, and calculate the line resistance of the ignition main circuit; based on the line resistance and the ignition current, a feedback closed-loop control method is used to dynamically control the voltage of the first output terminal of the ignition main circuit to reach the ignition voltage corresponding to the ignition current.

3. The intelligent ignition circuit according to claim 2, characterized in that: The control module includes: a conditioning circuit, an analog-to-digital conversion circuit, an isolation circuit and a CPU circuit, wherein: A conditioning circuit, whose first input end is connected to the first input end of the switch circuit, whose second input end is connected to the first output end of the ignition main circuit, whose output end is connected to the input end of the analog-to-digital conversion circuit, and which is used to perform signal conditioning on the voltage of the first input end of the switch circuit and the voltage of the first output end of the ignition main circuit; an analog-to-digital conversion circuit, whose output end is connected to the input end of the isolation circuit, and whose output end is connected to the input end of the isolation circuit, and is used to convert the analog signal of the voltage at the first input end of the switch circuit into a digital signal; an isolation circuit, whose output end is connected to the second input end of the CPU circuit and is used for signal isolation; A CPU circuit, whose first input terminal is connected to the input terminal of the ignition main circuit, whose first output terminal is connected to the control terminal of the switch circuit, and whose second output terminal is connected to the control terminal of the ignition main circuit, is used to calculate the line resistance of the ignition main circuit and dynamically control the voltage of the first output terminal of the ignition main circuit to reach the ignition voltage corresponding to the ignition current.

4. The intelligent ignition circuit according to claim 3, characterized in that: The control module also includes: The serial port circuit has an input end connected to the input end of the ignition main circuit, and an output end connected to the first input end of the CPU circuit.

5. The intelligent ignition circuit according to claim 1, characterized in that: The switch circuit includes: a first relay, a second relay, a first transistor and a second transistor, wherein: A first relay, whose input end is connected to the second output end of the control circuit, whose output end is connected to the input end of the second relay and the second input end of the control circuit, whose first power supply end inputs a power supply voltage, and whose second power supply end is grounded through the first transistor; A second relay, whose second input end is connected to the first output end of the ignition main circuit, whose output end is connected to the second input end of the ignition main circuit, whose first power supply end inputs the power supply voltage, and whose second power supply end is grounded through the first transistor; A first triode, a control end of which is connected to the first output end of the control circuit; A second triode, a control end of which is connected to the first output end of the control circuit; Before the ignition main circuit is not input with the ignition current, the control circuit controls the first transistor and the second transistor to be turned on, the input end of the first relay is connected to its output end, and the first input end of the second relay is connected to its output end; Before the ignition main circuit inputs the ignition current, the control circuit controls the first transistor to be turned off and the second transistor to be turned on, the input end of the first relay is disconnected from its output end, and the second input end of the second relay is connected to its output end.

6. The intelligent ignition circuit according to claim 1, characterized in that: The ignition main circuit includes: a drive circuit and a DC-DC circuit, wherein: A drive circuit, whose input end is connected to the first output end of the control circuit, and whose output end is connected to the control end of the power device of the DC-DC circuit; A DC-DC circuit, a first input end of which inputs the ignition current, a first output end of which is connected to the second input end of the switch circuit, and a second input end of which is connected to the output end of the switch circuit; After the ignition current is input into the DC-DC circuit, the control circuit dynamically controls the PWM duty cycle output by the drive circuit based on the line resistance and the ignition current using a feedback closed-loop control method to control the voltage at the first output terminal of the DC-DC circuit to reach the ignition voltage corresponding to the ignition current.

7. The intelligent ignition circuit according to claim 6, characterized in that: The driving circuit comprises: An isolation driving chip has an input end thereof inputting the ignition current, a first output end thereof connected to the second input end of the switch circuit, and a second output end thereof connected to the output end of the switch circuit.

8. The intelligent ignition circuit according to claim 6, characterized in that: The DC-DC circuit includes: a third transistor, a fourth transistor, a capacitor and an inductor, wherein: A third triode, a first end of which is input with the ignition current, a second end of which is connected with the first end of the fourth triode and the first end of the inductor, and a control end of which is connected with the output end of the drive circuit; A fourth triode, a second end of which is grounded, and a control end of which is connected to the output end of the driving circuit; an inductor, a second end of which is connected to the first end of the capacitor, the second input end of the switch circuit, and the first output end of the ignition main circuit; The capacitor has a second end connected to the output end of the switch circuit and a second end connected to the ground.

9. The intelligent ignition circuit according to any one of claims 1 to 8, characterized in that: Also includes: A controllable current source is used to generate the ignition current.

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