CN215172644U - Overcurrent protection circuit and high-speed solenoid valve drive circuit - Google Patents
Overcurrent protection circuit and high-speed solenoid valve drive circuit Download PDFInfo
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- CN215172644U CN215172644U CN202120848197.XU CN202120848197U CN215172644U CN 215172644 U CN215172644 U CN 215172644U CN 202120848197 U CN202120848197 U CN 202120848197U CN 215172644 U CN215172644 U CN 215172644U
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Abstract
The utility model provides a high-speed solenoid valve drive circuit, include: the device comprises a singlechip U8, an overcurrent protection circuit U1, a first high-side drive circuit U2, a second high-side drive circuit U3, a high-side current measurement circuit U4, a high-speed electromagnetic valve U5, a low-side drive circuit U6 and a low-side current measurement circuit U7; the first high-side driving control end of the singlechip U8 is used for generating a first high-side control signal Ctrl _ HT, and is connected in parallel with the control end of the first high-side driving circuit U2 and the first high-side driving control end of the overcurrent protection circuit U1; the second high-side driving control end of the singlechip U8 is used for generating a second high-side control signal Ctrl _ HB, and is connected in parallel with the control end of the second high-side driving circuit U3 and the second high-side driving control end of the overcurrent protection circuit U1; the low-side driving control end of the singlechip U8 is used for generating a low-side control signal Ctrl _ LS, and is connected with the control end of a low-side driving circuit U6 and the low-side driving control end of an overcurrent protection circuit U1 in parallel; the high-speed electromagnetic valve is low in cost, safe and reliable, and suitable for driving the high-speed electromagnetic valve of the oil sprayer.
Description
Technical Field
The utility model relates to a control circuit, especially a high-speed solenoid valve drive circuit with overcurrent protection circuit.
Background
As shown in fig. 1, a driving circuit of an existing high-speed solenoid valve (injector solenoid valve) includes a single chip microcomputer U8, a first high-side driving circuit U2, a second high-side driving circuit U3, a high-side current measuring circuit U4, a high-speed solenoid valve U5, a low-side driving circuit U6, and a low-side current measuring circuit U7;
a first high-side drive control end, a second high-side drive control end and a low-side drive control end of the singlechip U8 respectively generate a first high-side control signal Ctrl _ HT, a second high-side control signal Ctrl _ HB and a low-side control signal Ctrl _ LS, and the first high-side control signal Ctrl _ HT, the second high-side control signal Ctrl _ HB and the low-side control signal Ctrl _ LS are respectively connected with control ends of a first high-side drive circuit U2, a second high-side drive circuit U3 and a low-side drive circuit U6; the current input ends of the first high-side driving circuit U2 and the second high-side driving circuit U3 are respectively connected with a power supply voltage Vtank provided by a high-voltage source and a power supply voltage Vbat provided by a storage battery;
the current output ends of the first high-side driving circuit U2 and the second high-side driving circuit U3 are connected with one end of a high-side current measuring circuit U4, the other end of the high-side current measuring circuit U4 is connected with one end of a high-speed solenoid valve U5, the other end of the high-speed solenoid valve U5 is connected with the current input end of a low-side driving circuit U6, the current output end of the low-side driving circuit U6 is connected with one end of a low-side current measuring circuit U7, and the other end of the low-side current measuring circuit U7 is grounded;
the current signal feedback ends of the high-side current measuring circuit U4 and the low-side current measuring circuit U7 respectively generate a high-side current monitoring signal Is _ HS and a low-side current monitoring signal Is _ LS, and the high-side current monitoring signal Is _ HS and the low-side current monitoring signal Is _ LS are respectively connected with two current signal monitoring ends of a single chip U8;
in the existing overcurrent protection circuit, a PCC (peak Current control) control circuit is constructed by a comparator, and when a high-speed solenoid valve has short-circuit overcurrent, the PCC control circuit constructed by the comparator can work in a high-Current high-speed switching state to wait for a software turn-off control signal, which easily causes the overheating damage of MOS transistors in the first high-side drive circuit U2, the second high-side drive circuit U3, or the low-side drive circuit U6.
Disclosure of Invention
To exist not enough among the prior art, the utility model provides an overcurrent protection circuit to and adopt this overcurrent protection circuit's high-speed solenoid valve drive circuit, with low costs, safe and reliable is applicable to the high-speed solenoid valve drive of sprayer. For realizing the above technical purpose, the utility model discloses a technical scheme is:
in a first aspect, an embodiment of the present invention provides an overcurrent protection circuit U1, including: 555 timer U101, diodes D1-D5, NMOS tube Q1 and resistors R1-R4;
a pin 5 of the 555 timer U101 is used as a reference voltage input end of the overcurrent protection circuit U1 and is used for receiving a reference voltage V _ REF generated by the singlechip U8;
a 4 th pin of the 555 timer U101 is connected with a voltage VDD;
a 6 th pin of the 555 timer U101 is respectively connected with one end of a resistor R1 and the cathodes of diodes D1 and D2; the anode of the diode D1 Is used as the high-side current signal monitoring end of the overcurrent protection circuit U1 and Is used for being connected with a high-side current monitoring signal Is _ HS generated by the high-side current measurement circuit U4; the anode of the diode D2 Is used as the low-side current signal monitoring terminal of the overcurrent protection circuit U1, and Is used for being connected with the low-side current monitoring signal Is _ LS generated by the low-side current measurement circuit U7; the other end of the resistor R1 is grounded;
a pin 2 of the 555 timer U101 is connected with one end of a resistor R2 and the drain electrode of an NMOS tube Q1, and the other end of the resistor R2 is connected with a voltage VDD; the grid of the NMOS tube Q1 is connected with one end of the resistor R3, and is used as the reset signal input end of the overcurrent protection circuit U1 and is used for being connected with a reset signal Ctrl _ RST generated by the singlechip U8; the other end of the resistor R3 and the source electrode of the NMOS tube Q1 are grounded;
a pin 3 of the 555 timer U101 is used as a diagnosis signal feedback end of the overcurrent protection circuit U1, and is used for generating a diagnosis signal Flg _ OC and sending the diagnosis signal Flg _ OC to a diagnosis signal input end of the singlechip U8;
a pin 7 of the 555 timer U101 is connected with cathodes of diodes D3, D4 and D5 and one end of a resistor R4, and the other end of the resistor R4 is connected with a voltage VDD;
the anode of the diode D3 is used as the first high-side driving control terminal of the overcurrent protection circuit U1, and is connected to the first high-side driving control terminal of the monolithic computer U8 and the control terminal of the first high-side driving circuit U2;
the anode of the diode D4 is used as the second high-side driving control terminal of the overcurrent protection circuit U1, and is connected to the second high-side driving control terminal of the monolithic computer U8 and the control terminal of the second high-side driving circuit U3;
the anode of the diode D5 is used as the low side driving control terminal of the overcurrent protection circuit U1, and is connected to the low side driving control terminal of the monolithic computer U8 and the control terminal of the low side driving circuit U6.
Furthermore, the 5 th pin of the 555 timer U101 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is grounded.
Further, the 4 th pin of the 555 timer U101 is grounded through a capacitor C2.
In a second aspect, an embodiment of the present invention provides a high-speed solenoid valve driving circuit, including: a single chip microcomputer U8, the overcurrent protection circuit U1, the first high-side drive circuit U2, the second high-side drive circuit U3, a high-side current measurement circuit U4, a high-speed electromagnetic valve U5, a low-side drive circuit U6 and a low-side current measurement circuit U7;
the first high-side driving control end of the singlechip U8 is used for generating a first high-side control signal Ctrl _ HT, and is connected in parallel with the control end of the first high-side driving circuit U2 and the first high-side driving control end of the overcurrent protection circuit U1;
the second high-side driving control end of the singlechip U8 is used for generating a second high-side control signal Ctrl _ HB, and is connected in parallel with the control end of the second high-side driving circuit U3 and the second high-side driving control end of the overcurrent protection circuit U1;
the low-side driving control end of the singlechip U8 is used for generating a low-side control signal Ctrl _ LS, and is connected with the control end of a low-side driving circuit U6 and the low-side driving control end of an overcurrent protection circuit U1 in parallel;
the reference voltage output end of the singlechip U8 is used for generating a reference voltage V _ REF and is connected with the reference voltage input end of the current protection circuit U1;
the reset signal output end of the singlechip U8 is used for generating a reset signal Ctrl _ RST and is connected with the reset signal input end of the current protection circuit U1 in parallel;
the diagnosis signal feedback end of the overcurrent protection circuit U1 is used for generating a diagnosis signal Flg _ OC and is connected with the diagnosis signal input end of the singlechip U8 in parallel;
the current input ends of the first high-side driving circuit U2 and the second high-side driving circuit U3 are respectively connected with a power supply voltage Vtank provided by a high-voltage source and a power supply voltage Vbat provided by a storage battery; the current output ends of the first high-side driving circuit U2 and the second high-side driving circuit U3 are connected with one end of a high-side current measuring circuit U4, the other end of the high-side current measuring circuit U4 is connected with one end of a high-speed solenoid valve U5, the other end of the high-speed solenoid valve U5 is connected with the current input end of a low-side driving circuit U6, the current output end of the low-side driving circuit U6 is connected with one end of a low-side current measuring circuit U7, and the other end of the low-side current measuring circuit U7 is grounded;
the current signal feedback end of the high-side current measuring circuit U4 Is used for generating a high-side current monitoring signal Is _ HS, and Is connected with the high-side current signal monitoring end of the current protection circuit U1 and the high-side current signal monitoring end of the singlechip U8 in parallel;
the current signal feedback end of the low-side current measuring circuit U7 Is used for generating a low-side current monitoring signal Is _ LS, and Is connected with the low-side current signal monitoring end of the current protection circuit U1 and the low-side current signal monitoring end of the singlechip U8 in parallel.
The utility model has the advantages that:
1) the shutdown can be kept by using the trigger in the 555 timer, and the protection is reliable.
2) When the drive circuit is turned off, an overcurrent diagnosis signal can be output to the singlechip.
3) The software can reset and restart the driver circuit for fault confirmation.
4) The cost is low, the applicability is good, and the short-circuit protection of a plurality of actuator drives can be expanded.
Drawings
Fig. 1 is a schematic diagram of a high-speed solenoid valve driving circuit in the prior art.
Fig. 2 is a schematic diagram of a high-speed solenoid valve driving circuit in an embodiment of the present invention.
Fig. 3 is a schematic diagram of an overcurrent protection circuit according to an embodiment of the present invention.
Fig. 4 is an exemplary diagram of an operation sequence in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 2, the present invention provides a high-speed solenoid valve driving circuit (hereinafter referred to as driving circuit), including: the device comprises a singlechip U8, an overcurrent protection circuit U1, a first high-side drive circuit U2, a second high-side drive circuit U3, a high-side current measurement circuit U4, a high-speed electromagnetic valve U5, a low-side drive circuit U6 and a low-side current measurement circuit U7;
the first high-side driving control end of the singlechip U8 is used for generating a first high-side control signal Ctrl _ HT, and is connected in parallel with the control end of the first high-side driving circuit U2 and the first high-side driving control end of the overcurrent protection circuit U1;
the second high-side driving control end of the singlechip U8 is used for generating a second high-side control signal Ctrl _ HB, and is connected in parallel with the control end of the second high-side driving circuit U3 and the second high-side driving control end of the overcurrent protection circuit U1;
the low-side driving control end of the singlechip U8 is used for generating a low-side control signal Ctrl _ LS, and is connected with the control end of a low-side driving circuit U6 and the low-side driving control end of an overcurrent protection circuit U1 in parallel;
the reference voltage output end of the singlechip U8 is used for generating a reference voltage V _ REF and is connected with the reference voltage input end of the current protection circuit U1;
the reset signal output end of the singlechip U8 is used for generating a reset signal Ctrl _ RST and is connected with the reset signal input end of the current protection circuit U1 in parallel;
the diagnosis signal feedback end of the overcurrent protection circuit U1 is used for generating a diagnosis signal Flg _ OC and is connected with the diagnosis signal input end of the singlechip U8 in parallel;
the current input ends of the first high-side driving circuit U2 and the second high-side driving circuit U3 are respectively connected with a power supply voltage Vtank provided by a high-voltage source and a power supply voltage Vbat provided by a storage battery; the current output ends of the first high-side driving circuit U2 and the second high-side driving circuit U3 are connected with one end of a high-side current measuring circuit U4, the other end of the high-side current measuring circuit U4 is connected with one end of a high-speed solenoid valve U5, the other end of the high-speed solenoid valve U5 is connected with the current input end of a low-side driving circuit U6, the current output end of the low-side driving circuit U6 is connected with one end of a low-side current measuring circuit U7, and the other end of the low-side current measuring circuit U7 is grounded;
the current signal feedback end of the high-side current measuring circuit U4 Is used for generating a high-side current monitoring signal Is _ HS, and Is connected with the high-side current signal monitoring end of the current protection circuit U1 and the high-side current signal monitoring end of the singlechip U8 in parallel;
the current signal feedback end of the low-side current measuring circuit U7 Is used for generating a low-side current monitoring signal Is _ LS, and Is connected with the low-side current signal monitoring end of the current protection circuit U1 and the low-side current signal monitoring end of the singlechip U8 in parallel;
as shown in fig. 3, the present invention provides an overcurrent protection circuit U1, including: 555 timer U101, diodes D1-D5, NMOS tube Q1, resistors R1-R4, capacitors C1 and C2;
a pin 5 of the 555 timer U101 is connected with one end of a capacitor C1, is used as a reference voltage input end of an overcurrent protection circuit U1 and is used for being connected with a reference voltage V _ REF generated by a singlechip U8; the other end of the capacitor C1 is grounded;
the 4 th pin of the 555 timer U101 is connected with the voltage VDD and is grounded through a capacitor C2;
a 6 th pin of the 555 timer U101 is respectively connected with one end of a resistor R1 and the cathodes of diodes D1 and D2; the anode of the diode D1 Is used as the high-side current signal monitoring end of the overcurrent protection circuit U1 and Is used for being connected with a high-side current monitoring signal Is _ HS generated by the high-side current measurement circuit U4; the anode of the diode D2 Is used as the low-side current signal monitoring terminal of the overcurrent protection circuit U1, and Is used for being connected with the low-side current monitoring signal Is _ LS generated by the low-side current measurement circuit U7; the other end of the resistor R1 is grounded;
a pin 2 of the 555 timer U101 is connected with one end of a resistor R2 and the drain electrode of an NMOS tube Q1, and the other end of the resistor R2 is connected with a voltage VDD; the grid of the NMOS tube Q1 is connected with one end of the resistor R3, and is used as the reset signal input end of the overcurrent protection circuit U1 and is used for being connected with a reset signal Ctrl _ RST generated by the singlechip U8; the other end of the resistor R3 and the source electrode of the NMOS tube Q1 are grounded;
a pin 3 of the 555 timer U101 is used as a diagnosis signal feedback end of the overcurrent protection circuit U1, and is used for generating a diagnosis signal Flg _ OC and sending the diagnosis signal Flg _ OC to a diagnosis signal input end of the singlechip U8;
a pin 7 of the 555 timer U101 is connected with cathodes of diodes D3, D4 and D5 and one end of a resistor R4, and the other end of the resistor R4 is connected with a voltage VDD;
the anode of the diode D3 is used as the first high-side driving control terminal of the overcurrent protection circuit U1, and is connected to the first high-side driving control terminal of the monolithic computer U8 and the control terminal of the first high-side driving circuit U2;
the anode of the diode D4 is used as the second high-side driving control terminal of the overcurrent protection circuit U1, and is connected to the second high-side driving control terminal of the monolithic computer U8 and the control terminal of the second high-side driving circuit U3;
the anode of the diode D5 is used as the low side driving control terminal of the overcurrent protection circuit U1, and is connected to the low side driving control terminal of the monolithic computer U8 and the control terminal of the low side driving circuit U6.
As shown in fig. 4, an example of the working sequence of the embodiment of the present invention is given;
when the driving current Is over-current, namely the low-side current monitoring signal Is _ LS exceeds the reference voltage V _ REF, the RS flip-flop inside the 555 timer U101 Is set to 1, the internal discharge transistor Is turned on, the 7 th pin outputs low level, and the three control signals Ctrl _ HB, Ctrl _ HT and Ctrl _ LS are pulled down to realize the complete turn-off of the driving circuit; meanwhile, the 3 rd pin of the 555 timer U101 is changed from high level to low level and is output to the singlechip U8 as a diagnosis signal Flg _ OC;
when the single chip microcomputer U8 puts the reset signal Ctrl _ RST high (>10us), Q1 is conducted, the 2 nd pin of the 555 timer U8 is pulled low, the RS trigger in the 555 timer U8 is set to 0, the internal discharge transistor is disconnected, clamps on three control signals Ctrl _ HB, Ctrl _ HT and Ctrl _ LS are released, and the driving circuit returns to normal; meanwhile, the diagnosis signal Flg _ OC transmitted to the singlechip is also restored to high level, and the fault protection is released.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (4)
1. An overcurrent protection circuit U1, comprising: 555 timer U101, diodes D1-D5, NMOS tube Q1 and resistors R1-R4;
a pin 5 of the 555 timer U101 is used as a reference voltage input end of the overcurrent protection circuit U1 and is used for receiving a reference voltage V _ REF generated by the singlechip U8;
a 4 th pin of the 555 timer U101 is connected with a voltage VDD;
a 6 th pin of the 555 timer U101 is respectively connected with one end of a resistor R1 and the cathodes of diodes D1 and D2; the anode of the diode D1 Is used as the high-side current signal monitoring end of the overcurrent protection circuit U1 and Is used for being connected with a high-side current monitoring signal Is _ HS generated by the high-side current measurement circuit U4; the anode of the diode D2 Is used as the low-side current signal monitoring terminal of the overcurrent protection circuit U1, and Is used for being connected with the low-side current monitoring signal Is _ LS generated by the low-side current measurement circuit U7; the other end of the resistor R1 is grounded;
a pin 2 of the 555 timer U101 is connected with one end of a resistor R2 and the drain electrode of an NMOS tube Q1, and the other end of the resistor R2 is connected with a voltage VDD; the grid of the NMOS tube Q1 is connected with one end of the resistor R3, and is used as the reset signal input end of the overcurrent protection circuit U1 and is used for being connected with a reset signal Ctrl _ RST generated by the singlechip U8; the other end of the resistor R3 and the source electrode of the NMOS tube Q1 are grounded;
a pin 3 of the 555 timer U101 is used as a diagnosis signal feedback end of the overcurrent protection circuit U1, and is used for generating a diagnosis signal Flg _ OC and sending the diagnosis signal Flg _ OC to a diagnosis signal input end of the singlechip U8;
a pin 7 of the 555 timer U101 is connected with cathodes of diodes D3, D4 and D5 and one end of a resistor R4, and the other end of the resistor R4 is connected with a voltage VDD;
the anode of the diode D3 is used as the first high-side driving control terminal of the overcurrent protection circuit U1, and is connected to the first high-side driving control terminal of the monolithic computer U8 and the control terminal of the first high-side driving circuit U2;
the anode of the diode D4 is used as the second high-side driving control terminal of the overcurrent protection circuit U1, and is connected to the second high-side driving control terminal of the monolithic computer U8 and the control terminal of the second high-side driving circuit U3;
the anode of the diode D5 is used as the low side driving control terminal of the overcurrent protection circuit U1, and is connected to the low side driving control terminal of the monolithic computer U8 and the control terminal of the low side driving circuit U6.
2. The overcurrent protection circuit U1 as set forth in claim 1,
the 5 th pin of the 555 timer U101 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is grounded.
3. The overcurrent protection circuit U1 as set forth in claim 1,
the 4 th pin of the 555 timer U101 is grounded through a capacitor C2.
4. A high speed solenoid driver circuit comprising: a single chip microcomputer U8, an overcurrent protection circuit U1 as claimed in claim 1, 2 or 3, a first high side drive circuit U2, a second high side drive circuit U3, a high side current measurement circuit U4, a high speed solenoid valve U5, a low side drive circuit U6, and a low side current measurement circuit U7;
the first high-side driving control end of the singlechip U8 is used for generating a first high-side control signal Ctrl _ HT, and is connected in parallel with the control end of the first high-side driving circuit U2 and the first high-side driving control end of the overcurrent protection circuit U1;
the second high-side driving control end of the singlechip U8 is used for generating a second high-side control signal Ctrl _ HB, and is connected in parallel with the control end of the second high-side driving circuit U3 and the second high-side driving control end of the overcurrent protection circuit U1;
the low-side driving control end of the singlechip U8 is used for generating a low-side control signal Ctrl _ LS, and is connected with the control end of a low-side driving circuit U6 and the low-side driving control end of an overcurrent protection circuit U1 in parallel;
the reference voltage output end of the singlechip U8 is used for generating a reference voltage V _ REF and is connected with the reference voltage input end of the current protection circuit U1;
the reset signal output end of the singlechip U8 is used for generating a reset signal Ctrl _ RST and is connected with the reset signal input end of the current protection circuit U1 in parallel;
the diagnosis signal feedback end of the overcurrent protection circuit U1 is used for generating a diagnosis signal Flg _ OC and is connected with the diagnosis signal input end of the singlechip U8 in parallel;
the current input ends of the first high-side driving circuit U2 and the second high-side driving circuit U3 are respectively connected with a power supply voltage Vtank provided by a high-voltage source and a power supply voltage Vbat provided by a storage battery; the current output ends of the first high-side driving circuit U2 and the second high-side driving circuit U3 are connected with one end of a high-side current measuring circuit U4, the other end of the high-side current measuring circuit U4 is connected with one end of a high-speed solenoid valve U5, the other end of the high-speed solenoid valve U5 is connected with the current input end of a low-side driving circuit U6, the current output end of the low-side driving circuit U6 is connected with one end of a low-side current measuring circuit U7, and the other end of the low-side current measuring circuit U7 is grounded;
the current signal feedback end of the high-side current measuring circuit U4 Is used for generating a high-side current monitoring signal Is _ HS, and Is connected with the high-side current signal monitoring end of the current protection circuit U1 and the high-side current signal monitoring end of the singlechip U8 in parallel;
the current signal feedback end of the low-side current measuring circuit U7 Is used for generating a low-side current monitoring signal Is _ LS, and Is connected with the low-side current signal monitoring end of the current protection circuit U1 and the low-side current signal monitoring end of the singlechip U8 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120848197.XU CN215172644U (en) | 2021-04-23 | 2021-04-23 | Overcurrent protection circuit and high-speed solenoid valve drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120848197.XU CN215172644U (en) | 2021-04-23 | 2021-04-23 | Overcurrent protection circuit and high-speed solenoid valve drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN215172644U true CN215172644U (en) | 2021-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120848197.XU Active CN215172644U (en) | 2021-04-23 | 2021-04-23 | Overcurrent protection circuit and high-speed solenoid valve drive circuit |
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| Country | Link |
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| CN (1) | CN215172644U (en) |
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