CN203979586U - A kind of multipath electrovalve flash control and flash current sampling circuit - Google Patents
A kind of multipath electrovalve flash control and flash current sampling circuit Download PDFInfo
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- CN203979586U CN203979586U CN201420407838.8U CN201420407838U CN203979586U CN 203979586 U CN203979586 U CN 203979586U CN 201420407838 U CN201420407838 U CN 201420407838U CN 203979586 U CN203979586 U CN 203979586U
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Abstract
The utility model discloses the control of a kind of multipath electrovalve flash and flash current sampling circuit, the output terminal that passes through a current sampling resistor and be connected in high side drivers of electromagnetic valve coil, high side drivers connects voltage source Vcc and square-wave generator; Also comprise current sample amplification circuit, two input ends of current sample amplification circuit are connected to the two ends of current sampling resistor, and the output terminal of current sample amplification circuit is used for connecting processor; Current sample amplification circuit comprises the common mode reduction voltage circuit that is connected to current sampling resistor two ends, and is connected to the two-stage amplification circuit of common mode reduction voltage circuit output terminal.The beneficial effects of the utility model are to change traditional low limit driver into flash driving mode, the control of flash switch be power supply, in the time that switch disconnects, in the loop of switch control, there is no electricity, while being short-circuited ground, there is no potential safety hazard.
Description
Technical field
The utility model relates to Vehicle Electronic Control field, is specifically related to the control of a kind of multipath electrovalve flash and flash current sampling circuit.
Background technique
In recent years, automatic transmission case is widely applied in various types of vehicles, and its convenient, simple, safe mode of operation obtains liking of driver.For transmission system, it belongs to crucial power assembly system, how to ensure that system reliability of operation and Security are worth everybody to pay close attention to.In gearbox control system, solenoid valve is divided into two kinds: switch electromagnetic valve and proportional control electromagnetic valve, wherein switch electromagnetic valve is by certain curtage, make wherein certain battery valve Inside coil energising, then drive inner needle-valve or ball valve to be subjected to displacement, thereby block or get through oil circuit, regulate for controlling gear shift ratio.The existing solenoid valve modes that adopt low limit to drive, connect driver, but such set-up mode Security are lower at electromagnetic valve coil grounding end more, exist because wire harness damages and bring shorted to earth, thereby cause functional fault or potential safety hazard.
Summary of the invention:
The technical problems to be solved in the utility model is to provide the control of a kind of multipath electrovalve flash and flash current sampling circuit, at electromagnetic valve coil flash, driving switch is set, and by current sample amplification circuit, current sampling resistor is sampled.
For solving the problems of the technologies described above, the technical solution of the utility model is the control of a kind of multipath electrovalve flash and flash current sampling circuit, comprise solenoid valve, electromagnetic valve coil one end ground connection, the other end of electromagnetic valve coil is connected in the output terminal of high side drivers by a current sampling resistor, high side drivers connects voltage source Vcc and square-wave generator; Also comprise current sample amplification circuit, two input ends of current sample amplification circuit are connected to the two ends of current sampling resistor, and the output terminal of current sample amplification circuit is used for connecting processor; Current sample amplification circuit comprises the common mode reduction voltage circuit that is connected to current sampling resistor two ends, and is connected to the two-stage amplification circuit of common mode reduction voltage circuit output terminal.
Preferably, comprise several solenoid valves, each solenoid valve is connected in respectively the output terminal of high side drivers by a current sampling resistor, and the two ends of each current sampling resistor are connected respectively in a current sample amplification circuit.
Preferably, two-stage amplification circuit is designated as first order amplification circuit and second level amplification circuit, first order amplification circuit comprises the first operational amplifier U1, and the in-phase input end of the first operational amplifier U1, by build-out resistor R4 ground connection, is connected with build-out resistor R5 between inverting input and output terminal; Second level amplification circuit comprises the second operational amplifier U2, the in-phase input end of the second operational amplifier U2 is connected in the output terminal of first order amplification circuit by build-out resistor R3, between inverting input and output terminal, be connected with build-out resistor R6, the inverting input of the second operational amplifier U2 is by build-out resistor R8 ground connection.
Preferably, common mode reduction voltage circuit comprises two quenching resistors, one end of the first quenching resistor R3 is connected between current sampling resistor and high side drivers, the other end is connected to the in-phase input end of the first operational amplifier U1, one end of the second quenching resistor R4 is connected between current sampling resistor and solenoid valve, and the other end is connected to the inverting input of the first operational amplifier U1.
Preferably, also comprise afterflow protective circuit, afterflow protective circuit one end is connected between current sampling resistor and high side drivers, the other end ground connection.
Preferably, each current sampling resistor correspondence arranges an afterflow protective circuit, the parallel connection of several afterflow protective circuit.
Preferably, afterflow protective circuit is diode, the positive terminal ground connection of diode.
The beneficial effects of the utility model are to change traditional low limit driver into flash driving mode, the control of flash switch be power supply, in the time that switch disconnects, in the loop of switch control, there is no electricity, while being short-circuited ground, there is no potential safety hazard.After greatly reducing traditional lower edge switch and disconnecting due to the charged risk that causes short circuit still in control loop.Utilize flash current sampling circuit to sample to current sampling resistor both end voltage simultaneously, by common mode reduction voltage circuit, the differential signal at current sampling resistor two ends is converted to end end to earth signal, by two-stage amplification circuit, required differential mode voltage is amplified to the required scope of system again, while avoiding only by one-level amplifier, the common mode voltage of input end may exceed the scope of the normal work of amplifier, and causes circuit to lose the risk of its enlarging function.By current sample amplification circuit, current sampling resistor both end voltage is exported to processor, can also realize follow-up various faut detections to solenoid valve and prevent the functions such as solenoid valve overload.
Brief description of the drawings
Fig. 1 is the utility model embodiment's structural representation,
Fig. 2 is the structural representation of the utility model embodiment current sample amplification circuit.
In figure:
1, square-wave generator, 2, high side drivers, 3, current sample amplification circuit, 4, processor.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
As shown in Figure 1, a kind of multipath electrovalve flash control and flash current sampling circuit, comprise two solenoid valves, be solenoid valve L1 and solenoid valve L2, coil one end ground connection of solenoid valve L1 and solenoid valve L2, the solenoid valve L1 coil the other end connects the output terminal of high side drivers 2 by current sampling resistor R1, the solenoid valve L2 coil the other end connects the output terminal of high side drivers 2 by current sampling resistor R2, high side drivers 2 is connected with voltage source, and its input end is connected in the output terminal of square-wave generator 1; The two ends of the two ends of current sampling resistor R1 and current sampling resistor R2 are connected respectively in a current sample amplification circuit 3, and the output terminal of current sample amplification circuit 3 is used for connecting processor 4.What the high side drivers 2 in the present embodiment adopted is the TLE6288 type of Infineon.Two current sampling resistor R1 and R2 respectively correspondence arrange an afterflow protective circuit; the parallel connection of two afterflow protective circuits; afterflow protective circuit is diode; concrete the present embodiment comprises two afterflow protective circuit diode D1 and D2; the negative pole end of D1 is connected between current sampling resistor R1 and high side drivers 2; positive terminal ground connection, the negative pole end of D2 is connected between current sampling resistor R2 and high side drivers 2, positive terminal ground connection.
Taking the current sample amplification circuit 3 of current sampling resistor R1 as example, as shown in Figure 2, comprise the common mode reduction voltage circuit that is connected to current sampling resistor R1 two ends, and be connected to the two-stage amplification circuit of common mode reduction voltage circuit output terminal.
Two-stage amplification circuit is designated as first order amplification circuit and second level amplification circuit, first order amplification circuit comprises the first operational amplifier U1, the in-phase input end of the first operational amplifier U1, by build-out resistor R5 ground connection, is connected with build-out resistor R6 between inverting input and output terminal; Second level amplification circuit comprises the second operational amplifier U2, the in-phase input end of the second operational amplifier U2 is connected in the output terminal of first order amplification circuit by build-out resistor R7, between inverting input and output terminal, be connected with build-out resistor R9, the inverting input of the second operational amplifier is by build-out resistor R8 ground connection.
Common mode reduction voltage circuit comprises two quenching resistors, one end of the first quenching resistor R3 is connected between current sampling resistor R1 and high side drivers 2, the other end is connected to the in-phase input end of the first operational amplifier U1, one end of the second quenching resistor R4 is connected between current sampling resistor R1 and electromagnetic valve coil L1, and the other end is connected to the inverting input of the first operational amplifier U1.
In common mode reduction voltage circuit, in the resistance value of quenching resistor and first order amplification circuit, the resistance value of two build-out resistor R5, R6 should meet the following conditions:
(2Vin-Vrt)*R5/2*(R3+R5)<VIR，
(2Vin-Vrt)*R6/2*(R4+R6)<VIR，
Wherein Vin is the magnitude of voltage of the upper end of current sampling resistor, and Vrt is the magnitude of voltage at current sampling resistor two ends, and VIR is the maximum value of the first operational amplifier U1 common-mode voltage range.
By the setting of above-mentioned resistance value, within the common mode input of first order amplifier being reduced to the application area of amplifier, the differential signal at current sampling resistor R1 two ends is transformed to single-ended signal over the ground, second level amplifier is amplified to required differential mode voltage the required scope of system more simultaneously.Can need to set according to system the magnification factor of second level amplification circuit.
Producing a PWM by square-wave generator 1 drives the switch of SC sigmal control high side drivers 2 to realize the control to solenoid valve.The present embodiment selects common amplifier to build current detection circuit, in first order amplification circuit, utilize resitstance voltage divider to reduce by a certain percentage flash common mode voltage, make in its input common-mode range in inspection stream amplifier, then set the magnification factor of second level amplification circuit according to requirement of system design.
Present automobile mostly be minus earth, adopt flash switch powering load to have a series of benefit, one of significant effect is to reduce because of damaged opening circuit of causing of electric wire, improves the reliability of system.If one end of load is directly connected on the ground on chassis, only need single line powering load, this has also saved system cost.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of the utility model claims.
Claims (7)
1. multipath electrovalve flash control and flash current sampling circuit, comprise solenoid valve, described electromagnetic valve coil one end ground connection, it is characterized in that: the other end of described electromagnetic valve coil is connected in the output terminal of high side drivers (2) by a current sampling resistor, described high side drivers (2) connects voltage source Vcc and square-wave generator (1); Also comprise current sample amplification circuit (3), two input ends of described current sample amplification circuit (3) are connected to the two ends of described current sampling resistor, and the output terminal of described current sample amplification circuit (3) is used for connecting processor (4); Described current sample amplification circuit (3) comprises the common mode reduction voltage circuit that is connected to current sampling resistor two ends, and is connected to the two-stage amplification circuit of described common mode reduction voltage circuit output terminal.
2. a kind of multipath electrovalve flash according to claim 1 control and flash current sampling circuit, it is characterized in that: comprise several solenoid valves, described in each, solenoid valve is connected in respectively the output terminal of described high side drivers (2) by a current sampling resistor, and the two ends of each described current sampling resistor are connected respectively in a described current sample amplification circuit (3).
3. a kind of multipath electrovalve flash according to claim 1 control and flash current sampling circuit, it is characterized in that: described two-stage amplification circuit is designated as first order amplification circuit and second level amplification circuit, described first order amplification circuit comprises the first operational amplifier U1, the in-phase input end of described the first operational amplifier U1, by build-out resistor R4 ground connection, is connected with build-out resistor R5 between inverting input and output terminal; Described second level amplification circuit comprises the second operational amplifier U2, the in-phase input end of described the second operational amplifier U2 is connected in the output terminal of described first order amplification circuit by build-out resistor R3, between inverting input and output terminal, be connected with build-out resistor R6, the inverting input of described the second operational amplifier U2 is by build-out resistor R8 ground connection.
4. a kind of multipath electrovalve flash according to claim 1 control and flash current sampling circuit, it is characterized in that: described common mode reduction voltage circuit comprises two quenching resistors, one end of the first quenching resistor R3 is connected between described current sampling resistor and high side drivers (2), the other end is connected to the in-phase input end of described the first operational amplifier U1, one end of the second quenching resistor R4 is connected between described current sampling resistor and solenoid valve, and the other end is connected to the inverting input of described the first operational amplifier U1.
5. a kind of multipath electrovalve flash according to claim 1 control and flash current sampling circuit; it is characterized in that: also comprise afterflow protective circuit; described afterflow protective circuit one end is connected between described current sampling resistor and high side drivers (2), the other end ground connection.
6. a kind of multipath electrovalve flash according to claim 5 control and flash current sampling circuit, is characterized in that: each described current sampling resistor correspondence arranges an afterflow protective circuit, the parallel connection of several described afterflow protective circuit.
7. according to a kind of multipath electrovalve flash control described in claim 5 or 6 and flash current sampling circuit, it is characterized in that: described afterflow protective circuit is diode the positive terminal ground connection of described diode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420407838.8U CN203979586U (en) | 2014-07-23 | 2014-07-23 | A kind of multipath electrovalve flash control and flash current sampling circuit |
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| CN201420407838.8U CN203979586U (en) | 2014-07-23 | 2014-07-23 | A kind of multipath electrovalve flash control and flash current sampling circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372552A (en) * | 2015-12-10 | 2016-03-02 | 南京康尼电子科技有限公司 | Load open circuit detection circuit and method for high-side switch |
| CN105675958A (en) * | 2016-01-27 | 2016-06-15 | 佛山市南海区联合广东新光源产业创新中心 | Circuit for detecting current in LED chip |
| CN107196770A (en) * | 2017-07-28 | 2017-09-22 | 深圳市瑞艾特科技有限公司 | The system being powered by signal wire |
| CN109683638A (en) * | 2018-12-20 | 2019-04-26 | 潍柴动力股份有限公司 | A kind of control system and control method of ratio adjusting valve |
| CN110103911A (en) * | 2019-05-13 | 2019-08-09 | 思与行科技(苏州)有限公司 | Wheel speed sensors interface control circuit for active electronic braking system |
| WO2019192297A1 (en) * | 2018-04-04 | 2019-10-10 | 精进电动科技股份有限公司 | Current sampling circuit of electromagnetic clutch controller |
| CN111163564A (en) * | 2020-01-10 | 2020-05-15 | 东莞锐视光电科技有限公司 | Method for stably controlling current in light source |
| CN114251503A (en) * | 2021-12-22 | 2022-03-29 | 奇瑞汽车股份有限公司 | Driving circuit of inductive load, and method and device for detecting driving current |
-
2014
- 2014-07-23 CN CN201420407838.8U patent/CN203979586U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372552A (en) * | 2015-12-10 | 2016-03-02 | 南京康尼电子科技有限公司 | Load open circuit detection circuit and method for high-side switch |
| CN105675958A (en) * | 2016-01-27 | 2016-06-15 | 佛山市南海区联合广东新光源产业创新中心 | Circuit for detecting current in LED chip |
| CN107196770A (en) * | 2017-07-28 | 2017-09-22 | 深圳市瑞艾特科技有限公司 | The system being powered by signal wire |
| CN107196770B (en) * | 2017-07-28 | 2020-08-04 | 深圳市瑞艾特科技有限公司 | System for supplying power through signal wire |
| WO2019192297A1 (en) * | 2018-04-04 | 2019-10-10 | 精进电动科技股份有限公司 | Current sampling circuit of electromagnetic clutch controller |
| CN109683638A (en) * | 2018-12-20 | 2019-04-26 | 潍柴动力股份有限公司 | A kind of control system and control method of ratio adjusting valve |
| CN110103911A (en) * | 2019-05-13 | 2019-08-09 | 思与行科技(苏州)有限公司 | Wheel speed sensors interface control circuit for active electronic braking system |
| CN111163564A (en) * | 2020-01-10 | 2020-05-15 | 东莞锐视光电科技有限公司 | Method for stably controlling current in light source |
| CN114251503A (en) * | 2021-12-22 | 2022-03-29 | 奇瑞汽车股份有限公司 | Driving circuit of inductive load, and method and device for detecting driving current |
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