CN202091047U - High-voltage suspension electromagnetic valve driving circuit based on IR2110 technology - Google Patents

Abstract

The utility model discloses an IR2110-based high-voltage suspension solenoid valve drive circuit, which includes a control unit and a drive unit, the drive unit includes an IR2110 driver and a boost circuit; the control unit outputs a control signal; the IR2110 driver receives the output of the control unit control signal, and generate a corresponding drive signal according to the control signal to drive the solenoid valve to open, close or keep open or closed; the boost circuit is set at the low-end output of the IR2110 driver to boost the low-end of the IR2110 driver The output voltage at the output terminal makes the solenoid valve open quickly. The beneficial effects of the utility model are: the IR2110-based high-voltage suspension drive circuit realizes the quick closing of the solenoid valve, and has the advantages of wide control signal frequency range, opening current, holding current, adjustable PWM signal frequency and duty cycle, etc.

Description

High voltage suspension solenoid valve drive circuit based on IR2110

technical field

The utility model relates to the field of electricity, in particular to an IR2110-based high-voltage suspension electromagnetic valve driving circuit.

Background technique

According to the control signal sent by the ECU, the electronically controlled fuel injector injects the fuel into the combustion chamber of the engine with the best fuel injection timing, fuel injection quantity and fuel injection rate by controlling the opening and closing of the solenoid valve. The electronically controlled fuel injector is mainly composed of a fuel injector, a control piston, a control metering hole and a control solenoid valve. When the electromagnetic coil is energized, an electromagnetic attraction force is generated on the armature. When the attraction force is greater than the pre-tightening force of the return spring of the control valve, the electromagnetic valve is quickly opened, and the high-pressure fuel in the control room is quickly discharged to generate injection; when the electromagnetic coil is powered off, the electromagnetic The suction force disappears, and under the action of the return spring, the solenoid valve is quickly closed, the high-pressure fuel in the control room is quickly established, and the injection is stopped. Since the time of each injection of the common rail fuel injection system is very short, the electromagnet must be able to generate a strong suction force in a short time to overcome the tension of the return spring.

It can be seen from the following formula:

F＝A(IW) ² S/δ ² ×9.8×10 ^-8

Among them, F is the electromagnetic attraction force; A is a constant; I is the coil current; W is the number of coil turns; S is the cross-sectional area of the iron core; δ is the size of the air gap. The electromagnetic suction is proportional to the square of the current of the solenoid valve coil. To make the electromagnet produce enough suction, the current in the coil must be increased. To make the coil current increase rapidly in a short time, di/dt is required to be a larger value. Because the electromagnetic coil is a series connection of a resistance R of several ohms and an inductance L of several millihenries in the form of the circuit, when the external voltage U is applied, the change law of the current in the coil satisfies the voltage balance equation U=iR+Ldi/dt . When the structural parameters of the solenoid valve are fixed, the driving energy input should be increased as much as possible, that is, the value of the applied voltage U can be increased to obtain a higher di/dt, and then the rapid opening of the solenoid valve can be achieved. However, high current passing through the coil will inevitably cause heating. In order to avoid overheating of the solenoid valve coil, the coil current is quickly reduced to a smaller value after the valve is opened. Because after the magnetic force of the electromagnet overcomes the pulling force of the return spring, only a small suction force is needed to maintain the valve open state, which not only reduces power consumption, but also facilitates timely closing of the solenoid valve to achieve rapid oil stop. The current at this time is called maintenance. current. The ideal curve of the solenoid valve coil current in the whole working process is shown in Figure 1.

In order to realize the accurate control of the fuel injection quantity, fuel injection timing and fuel injection rate of the fuel injection system of the engine through the solenoid valve, and realize the rapid and accurate opening and closing of the above solenoid valve and effectively avoid the overheating of the solenoid valve coil, In addition to the precise manufacturing process of the solenoid valve itself, it is also necessary to design an efficient drive circuit.

Utility model content

In view of the above problems, the utility model provides an IR2110-based high-voltage suspension solenoid valve driving circuit that can enable the solenoid valve to be opened and closed quickly and accurately, and can effectively avoid the overheating of the solenoid valve coil.

In order to achieve the above purpose, the IR2110-based high-voltage suspension solenoid valve driving circuit described in the utility model includes:

a control unit that outputs a control signal; and,

drive unit, including IR2110 driver and booster circuit, where,

The IR2110 driver receives the control signal output by the control unit, and generates a corresponding driving signal according to the control signal to drive the solenoid valve to open, close or not act;

The boost circuit is set at the low-end output end of the IR2110 driver, and is used to boost the output voltage of the low-end output end of the IR2110 driver to quickly open the solenoid valve.

Preferably, it also includes a voltage feedback unit, which includes a resistance sampling module and a current sampling module, collects the resistance value of the solenoid valve and the current value flowing through the solenoid valve in real time, and obtains the actual voltage at both ends of the solenoid valve according to the resistance value and the current value. voltage and feed back the voltage value to the control unit.

Preferably, the control unit includes: a computer, a microcontroller, a voltage gating module, a voltage comparison module, a shaping circuit, and a logic programmable array module; wherein,

The computer outputs control instructions according to the action sequence of each solenoid valve;

The microcontroller, according to the control instruction output by the computer, simultaneously outputs the pulse voltage signal and the principal component analysis signal;

The voltage gating module receives the pulse voltage signal output by the microcontroller and the driving pulse voltage signal fed back by the logic programmable array, and determines whether the received pulse voltage signal meets the preset requirements, and will meet the preset requirements Pulse voltage signal output;

The voltage comparison module receives the pulse voltage signal output by the voltage gating module and the voltage signal fed back by the booster circuit, or also includes the voltage signal fed back by the voltage feedback unit; compares the received Pulse voltage signal, and output a pulse voltage signal that conforms to the preset comparison logic;

The shaping circuit receives the pulse voltage signal output by the voltage comparison module, and shapes the control voltage signal into a pulse voltage signal whose width and amplitude meet the requirements;

The logic programmable array module receives the principal component analysis signal output by the microcontroller and the pulse voltage signal output by the shaping circuit, and adjusts the received pulse voltage signal according to the principal component analysis signal to output the IR2110 The drive pulse voltage signal required by the driver, and the output drive pulse voltage signal is fed back to the voltage gating module.

Preferably, the boost circuit is composed of a field effect transistor connected to the low-end output of the IR2110 driver, a diode connected to the drain of the field effect transistor, and a capacitor with one end connected to the diode and the other end connected to the source of the field effect transistor .

The beneficial effects of the utility model are:

1. Using the high-voltage suspension characteristics of IR2110, a boost circuit is used to meet the high and low voltages required for the rapid opening and holding stages of the solenoid valve;

2. IR2110 is a driver integrated circuit with relatively good performance. It can be directly used in a low-power converter without expansion, making the circuit more compact. If expansion is required in the application, the cost of additional hardware is not high, and the space increase is not large;

3. The high-voltage suspension drive circuit based on IR2110 realizes the rapid closing of the solenoid valve, and has the advantages of wide range of control signal frequency, opening current, holding current, PWM signal frequency and duty cycle can be adjusted, etc.

Description of drawings

Figure 1 is a schematic diagram of an ideal current acting on a solenoid valve;

Fig. 2 is a schematic diagram of the internal structure of the IR2110 described in the utility model;

Fig. 3 is the overall schematic diagram of the driving circuit of the high-voltage suspension solenoid valve based on IR2110 described in the utility model;

Fig. 4 is the circuit diagram of the high-voltage suspension electromagnetic valve drive circuit based on IR2110 described in the utility model;

Fig. 5 is the schematic diagram of the step-up circuit described in the utility model;

Figure 6 is the waveform of the coil current change during the working process of the solenoid valve.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described further.

As shown in Figure 3, an IR2110-based high-voltage suspension solenoid valve drive circuit includes:

the control unit 1 outputs a control signal; and,

The driving unit 2 includes an IR2110 driver 4 and a boost circuit 5, wherein,

The IR2110 driver 4 receives the control signal output by the control unit 1, and generates a corresponding driving signal according to the control signal to drive the solenoid valve 6 to open, close or not act;

The boost circuit 5 is arranged at the low-end output end of the IR2110 driver 4, and is used to boost the output voltage of the low-end output end of the IR2110 driver 4 to enable the solenoid valve 6 to open quickly.

As a further embodiment of the present utility model, it also includes: a voltage feedback unit 3, which includes a resistance sampling module 7 and a current sampling module 8, and collects the resistance value of the solenoid valve 6 and the current value flowing through the solenoid valve 6 in real time, according to The resistance and current values yield the actual voltage across the solenoid valve 6 and feed this voltage back to the control unit 1 .

As a further embodiment of the present utility model, the control unit 1 includes: a computer 9, a microcontroller 10, a voltage gating module 11, a voltage comparison module 12, a shaping circuit 13 and a logic programmable array module 14; wherein,

The computer 9 outputs control instructions according to the action sequences of the solenoid valves;

The microcontroller 10, according to the control instruction output by the computer 9, simultaneously outputs the pulse voltage signal and the principal component analysis signal;

The voltage gating module 11 receives the pulse voltage signal output by the microcontroller 10 and the driving pulse voltage signal fed back by the logic programmable array 14, and determines whether the received pulse voltage signal meets the preset requirements, and will meet the Preset pulse voltage signal output;

The voltage comparison module 12 receives the pulse voltage signal output by the voltage gating module 11 and the voltage signal fed back by the booster circuit 5, or also includes the voltage signal fed back by the voltage feedback unit 3; Receive each pulse voltage signal, and output the pulse voltage signal conforming to the preset comparison logic;

The shaping circuit 13 receives the pulse voltage signal output by the voltage comparison module 12, and shapes the control voltage signal into a pulse voltage signal whose width and amplitude meet the requirements;

The logic programmable array module 14 receives the principal component analysis signal output by the microcontroller 10 and the pulse voltage signal output by the shaping circuit 13, and adjusts the output of the received pulse voltage signal according to the principal component analysis signal. The IR2110 driver 4 needs the driving pulse voltage signal, and feeds the output driving pulse voltage signal to the voltage gating module 11 .

As a further embodiment of the present invention, FIG. 5 is a basic circuit diagram of the boost circuit. The boost circuit 5 is composed of a field effect transistor connected to the low-end output of the IR2110 driver 4, a diode connected to the drain of the field effect transistor, and a capacitor with one end connected to the diode and the other end connected to the source of the field effect transistor. In order to achieve the rapid opening of the solenoid valve, it is necessary to use a boost conversion to achieve a high voltage V_H. Due to the large output ripple of the boost voltage, the dynamic response time is long, and in this system, V_H directly drives the solenoid valve. During the continuous injection process, the V_H voltage fluctuation must be At the same time, V_H should return to a stable value before the start of the next injection, which requires matching design of the boost conversion in combination with the injection system.

The utility model is designed on the basis of IR2110, wherein, the internal structure of IR2110 is shown in Figure 2, which consists of three parts, logic input, level translation and output protection. IR2110 adopts HVIC and latch anti-interference CMOS manufacturing process. It has independent low-end and high-end input channels; the suspension power supply adopts a bootstrap circuit, and its high-end operating voltage can reach 500V, dv/dt=±50V/ns, and the static power consumption is only 116mW at 15V; the output power terminal (pin 3, That is, the gate drive voltage of the power device) voltage range is 10-20V; the logic power supply voltage range (pin 9) is 5-15V, which can be easily matched with TTL and CMOS levels, and there is a gap between the logic power supply ground and the power ground. ±5V offset; high operating frequency, up to 500kHz; small turn-on and turn-off delays, 120ns and 94ns respectively; totem pole output peak current is 2A.

The driving circuit described in the utility model needs high-voltage power supply during the opening process of the valve core, so as to increase the rising rate of the leading edge of the current and accelerate the opening speed of the valve core. After the spool is fully opened, a low-voltage power supply is used to maintain the spool at the fully open position. Therefore, the difficulty in the design of high and low voltage drive circuits lies in how to solve the drive problem of the power tube at the high voltage end. To solve this problem, the independent low-end and high-end input channels of IR2110 can be used to generate different driving voltages to realize the rapid opening and closing of the solenoid valve. In the design, in order to reduce the burden on the electronic control unit, the MCU only needs to send out a square wave to control the length of the fuel injection time, and the PWM driving pulse required by the IR2110 is realized by the programmable logic array module.

The working principle of the utility model is as follows: as shown in Figure 4, taking the driving of two solenoid valves as an example, each field effect transistor (MOSFET) is turned on through the PWM control pulse of the logic programmable array module. When it comes, the MOSFET Q1 is turned on, and the boost voltage V_H is added to one of the solenoid valves through the MOSFET tube, and the capacitor is discharged at the same time. When the solenoid valve is fully opened, a low voltage is needed to maintain the opening of the solenoid valve. At this time, the high end of IR2110 generates a PWM pulse wave to turn on MOSFET Q2, and provides a maintenance voltage to the solenoid valve to maintain the opening of the solenoid valve spool until the task is completed. This is because the capacitor is discharged, and the value of the boost voltage V_H has decreased, so the capacitor needs to be charged continuously. The solenoid valve and capacitor form a boost circuit through MOSFET Q3 (or Q4) and diode D7 (or D8) to charge the capacitor, and provide a large current to the solenoid valve to quickly open the solenoid valve.

The power on and off of the solenoid valve is realized by controlling the switches of the high and low end MOSFETs. Figure 4 shows the actuation of two solenoid valves. There are two high-side group (Q1 and Q2) MOSFETs and two low-side group MOSFETs. At the high end, the source of each MOSFET (Q1 and Q2 in the figure) is connected to two solenoid valves, and its gate is connected to the PWM signal output. At the low end, the drain of each MOSFET is connected to a solenoid valve, and its grid is respectively connected to the two output terminals of the control circuit. The terminal MOSFET waits for the arrival of the PWM control signal. The aforementioned PWM signal is formed by the programmable logic of the logic programmable array module, and then adjusted by the IR2110 driver to control the high-end MOSFET switch. In this way, when the task process starts, each stroke will have the correct solenoid valve closed to complete the task, and the solenoid valve in the off-duty period will not be turned on due to the low-side MOSFET being turned off.

When the utility model is applied to the electronically controlled fuel injector, the excitation voltage of 80V is selected, that is, the boost voltage can be set to rise up to 80V, and the working condition of the solenoid valve is monitored. Figure 6 shows the current change of the solenoid valve coil collected Condition. It can be seen in the figure that starting from the rising edge of the fuel injection pulse, the two ends of the solenoid valve are connected to the excitation voltage, and the discharge of the capacitor makes the voltage of the solenoid valve drop from the excitation voltage to the supply voltage value, and then the voltage at both ends of the coil will remain at the supply voltage , During this period of time, the current of the coil increases rapidly and the opening current can reach 10A. After the solenoid valve is turned on, the voltage of the solenoid valve drops rapidly and then immediately rises to the supply voltage value to reduce the current flowing through the coil to reduce power consumption. At this time, it enters the current maintenance process until the rising edge of the fuel injection pulse ends, and the battery valve quickly closure.

The above are only preferred embodiments of the present utility model, but the scope of protection of the present utility model is not limited thereto. Any skilled person familiar with the art within the technical scope disclosed by the utility model can easily think of changes or Replacement should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be determined by the protection scope defined in the claims.

Claims (4)

1. A high-voltage suspension solenoid valve drive circuit based on IR2110, characterized in that it includes: a control unit (1), outputting a control signal; and, The driving unit (2) includes an IR2110 driver (4) and a boost circuit (5), wherein, The IR2110 driver (4) receives the control signal output by the control unit (1), and generates a corresponding drive signal according to the control signal to drive the solenoid valve (6) to open, close or not act; The boost circuit (5) is arranged at the low-end output end of the IR2110 driver (4), and is used to boost the output voltage of the low-end output end of the IR2110 driver (4) so that the solenoid valve (6) is quickly opened. 2. The high-voltage suspension solenoid valve drive circuit based on IR2110 according to claim 1, further comprising: a voltage feedback unit (3), which includes a resistance sampling module (7) and a current feedback module (8), real-time Collect the resistance value of the solenoid valve (6) and the current value flowing through the solenoid valve (6), obtain the actual voltage at both ends of the solenoid valve (6) according to the resistance value and current value, and feed back the voltage value to the control unit (1). 3. The IR2110-based high-voltage suspension solenoid valve drive circuit according to claim 1 or 2, characterized in that the control unit (1) includes: a computer (9), a microcontroller (10), a voltage gating module (11), voltage comparison module (12), shaping circuit (13) and logic programmable array module (14); wherein, The computer (9) outputs control instructions according to the action sequence of each solenoid valve; The microcontroller (10) simultaneously outputs pulse voltage signals and principal component analysis signals according to the control instructions output by the computer (9); The voltage gating module (11) receives the pulse voltage signal output by the microcontroller (10) and the driving pulse voltage signal fed back by the logic programmable array (14), and determines whether the received pulse voltage signal conforms to Preset requirements, output pulse voltage signals that meet the preset requirements; The voltage comparison module (12) receives the pulse voltage signal output by the voltage gating module (11) and the voltage signal fed back by the booster circuit (5) after boosting, or further includes the voltage feedback unit ( 3) The feedback voltage signal; compare the received pulse voltage signals, and output the pulse voltage signals that meet the preset requirements; The shaping circuit (13) receives the pulse voltage signal output by the voltage comparison module (12), and shapes the control voltage signal into a pulse voltage signal whose width and amplitude meet requirements; The logic programmable array module (14) receives the principal component analysis signal output by the microcontroller (10) and the pulse voltage signal output by the shaping circuit (13), and adjusts the received principal component analysis signal according to the principal component analysis signal. The pulse voltage signal outputs the driving pulse voltage signal required by the IR2110 driver (4), and the output driving pulse voltage signal is fed back to the voltage gating module (11). 4. The high-voltage suspension solenoid valve drive circuit based on IR2110 according to claim 1, characterized in that: the boost circuit (5) is composed of a field effect transistor connected to the low-end output of the IR2110 driver (4), and the A diode connected to the drain of the field effect transistor and a capacitor connected to the diode at one end and connected to the source of the field effect transistor at the other end.

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