CN212646807U - Low-cost low-power consumption rifle that charges connects detection circuitry - Google Patents
Low-cost low-power consumption rifle that charges connects detection circuitry Download PDFInfo
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- CN212646807U CN212646807U CN202020779333.XU CN202020779333U CN212646807U CN 212646807 U CN212646807 U CN 212646807U CN 202020779333 U CN202020779333 U CN 202020779333U CN 212646807 U CN212646807 U CN 212646807U
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Abstract
The utility model discloses a detection circuitry is connected to low-cost low-power consumption rifle that charges. The circuit mainly comprises a detection circuit, a delay circuit and a control conduction circuit. When the charging gun is not plugged, the detection circuit enables the circuit to be kept in a low power consumption mode, after the detection circuit detects that the charging gun is connected, the delay circuit starts timing, the single chip microcomputer wakes up within a certain time, the drive control conduction circuit opens the switch, and the low power consumption mode is ended. If the singlechip is dormant, the time delay circuit times again, and the singlechip enters a low power consumption mode after timing. The utility model discloses only used 2 fortune to put chip and some simple devices and just realized OBC's standby circuit, it has the advantage that can realize the low-power consumption requirement, can not increase the effect of complete machine cost again by a wide margin.
Description
Technical Field
The utility model relates to a vehicle field of charging indicates a low-cost low-power consumption rifle that charges connects detection circuitry especially.
Background
At present, an on-board battery charger (OBC) is in a standby state when no alternating current is input, and only after a charging gun is inserted, a host computer is awakened to work. However, in standby, in order to detect whether the charging gun is connected or not, (the charging gun contains 1 resistor, and the charging gun can be connected to the OBC when being inserted into a new energy vehicle) a circuit still keeps working, the circuit uses a 12V lead-acid battery on the vehicle, if the power consumption is too large, the power of the storage battery is insufficient, the vehicle cannot be started, and the power consumption is generally required to be less than 30 mW. And the power consumption of a common singlechip is more than 50mW, and the overall power consumption is more than 200mW by adding a peripheral circuit and a power supply circuit. Therefore, most manufacturers can select a special low-power chip, but the chip has high price and simple function, cannot be reused, and causes the price of the whole machine to rise. And the software of the system needs to be developed independently, which wastes research and development resources.
In order to solve the on-vehicle OBC standby circuit that current technique exists, because power consumptive restriction requires often to use special low-power consumption chip, brought the cost and risen, design complicated problem and drawback, the inventor has designed the utility model discloses a detection circuitry is connected to low-cost low-power consumption rifle that charges.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, an object of the present invention is to provide a low-cost and low-power charging gun connection detection circuit.
In order to achieve the above object, the utility model provides a low-cost low-power consumption rifle that charges connects detection circuitry, this circuit have not connect the rifle standby mode that charges, connect the rifle normal operating mode that charges and connect the rifle standby mode that charges, it mainly contains: the detection circuit keeps the circuit in a low power consumption mode when a charging gun is not plugged, and the detection circuit firstly starts timing by the delay circuit of the detection circuit after detecting that the charging gun is connected, wakes up a single chip microcomputer (the single chip microcomputer can be an OBC main chip) within preset time, drives the control conduction circuit to open a switch to end the low power consumption mode, can count time again by the delay circuit after the single chip microcomputer is dormant, and enters the low power consumption mode after timing for a preset time.
Furthermore, the detection circuit, the delay circuit and the control conduction circuit are composed of three voltage comparators, 3 field effect transistors and 1 switching tube; the delay circuit is characterized in that a first operational amplifier U1A, a second field effect transistor: the discharge MOS tube Q2, the resistor R6 and the capacitor C2 are main structures, and the detection circuit mainly comprises a third operational amplifier U2A and a fourth field effect tube Q4; the control conducting circuit is mainly composed of a second operational amplifier U1B, a first field effect transistor Q1 and a switch tube Q3, and can be forcibly turned off when the charging gun is not connected; when the charging gun is connected, the detection circuit controls the conduction circuit to be opened, the time delay circuit starts to time, if the single chip Microcomputer (MCU) is awakened, the discharge MOS tube (Q2) is controlled to be conducted, the time delay circuit is immediately reset to zero, and if the single chip Microcomputer (MCU) is not awakened or enters a sleep mode, the time delay circuit turns off the control circuit after the time delay circuit finishes the timing.
Preferably, when the charging gun is connected to a normal working mode, the resistor of the charging gun is connected between the reverse end of the first operational amplifier (U1A) and the same-direction end of the third operational amplifier (U2A) and the ground through the connection interface, at this time, the voltage of the first operational amplifier (U1A) in the same direction exceeds the reverse end, the first operational amplifier (U1A) outputs high resistance, the third operational amplifier (U2A) outputs low level, the field-effect transistor Q4 is cut off, and the voltage of the second operational amplifier (U1B) in the same direction is 6V; the voltage of a capacitor (C2) is connected to the ground in an opposite-phase end of the second operational amplifier (U1B) and can rise to 6V within a preset time, in the preset time, the second operational amplifier (U1B) outputs high level, the field-effect tube Q1 is conducted, the switching tube Q3 is driven to be conducted, and a power supply supplies power to a rear-end load (R8); because the single power supply of the single chip microcomputer is connected with the switching tube Q3, after the single chip microcomputer is electrified, a program starts to work, the detection switch S2 is controlled to be closed (the detection switch S2 is controlled by the single chip microcomputer to output power to the grid electrode of the discharge MOS tube (Q2)), the voltage of the capacitor C2 is thoroughly reduced, the state is stable, and the power supply can continuously supply power to a load; after charging is finished, when the single chip receives a standby command, the single chip cuts off power supply of a grid electrode of a discharge MOS (Q2), the discharge MOS (Q2) is cut off, at the moment, a power supply continuously charges a capacitor C2 through resistors R6 and R3 until the power supply is charged to a power supply voltage, at the moment, a second operational amplifier (U1B) overturns to output a low level, so that a field effect transistor Q1 and a switch tube Q3 are cut off, the power supply stops supplying power for a load, the discharge MOS (Q2) keeps a cut-off state, and the standby mode of connecting a charging gun is entered.
Further, since the power source charges the capacitor C2 through the resistors R3 and R6, the preset time can be adjusted by adjusting the RC parameter, and when the power source is 12V, the capacitor C2 is charged through the resistors R3 and R6, and the time is 0.12S by simulation.
The utility model has the advantages of, with the help of above-mentioned technical scheme, the utility model discloses only used 2 fortune to put chip and some simple devices and just realized OBC's standby circuit, it has can realize the low-power consumption requirement, can not increase the advantage of the effect of complete machine cost again by a wide margin.
Drawings
Fig. 1 is the utility model discloses a detection circuitry standby state is connected to low-cost low-power consumption rifle that charges.
Fig. 2 is the utility model discloses a low-cost low-power consumption rifle that charges connects normal operating condition behind detection circuitry inserts the rifle that charges.
Fig. 3 is the utility model discloses a standby mode state when low-cost low-power consumption rifle that charges is connected detection circuitry rifle that charges and is connected.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments with reference to the accompanying drawings.
The utility model discloses a detection circuitry is connected to low-cost low-power consumption rifle that charges. For solving prior art's problem, the utility model designs a hardware circuit, can charge the rifle and connect the detection to can realize the low-power consumption requirement under the very low condition of cost, following embodiment is used for explaining the utility model discloses, nevertheless not used for limiting the utility model discloses a scope.
Referring to fig. 1-3, the present invention provides a low-cost and low-power consumption connection detection circuit for a charging gun, which comprises 3 three voltage comparators, 3 field effect transistors, and 1 switch. Of the three MOS tubes, 2 are N channels and one is P channel, and the DS voltage is required to be more than 12V. In this embodiment, the voltage comparators are three comparators of two-way differential comparators LM2903D, and the field-effect transistor is selected as 2N7002, and the switching transistor Q3 is selected as 2N 4403.
The utility model discloses the main circuit comprises detection circuitry, delay circuit, control guidance switch-on circuit.
The design logic is as follows: when the charging gun is not plugged, the detection circuit enables the circuit to be kept in a low power consumption mode, after the detection circuit detects that the charging gun is connected, the delay circuit starts timing, the single chip microcomputer wakes up within a certain time, the drive control conduction circuit opens the switch, and the low power consumption mode is ended. If the singlechip is dormant, the time delay circuit times again, and the singlechip enters a low power consumption mode after timing.
The connection state of the charging gun is shown by a switch S1, the main function of the third operational amplifier U2A is to detect whether the charging gun is connected (the circuit diagram represents the charging gun by a resistor R12 of the charging gun, and the switch S1 represents the connection state of the charging gun), when the charging gun is connected, the switch S1 at one end of the resistor R12 is closed, and the resistor R12 of the charging gun is connected between the input end of the first operational amplifier and the ground.
In the figure, a delay circuit is formed by a first operational amplifier U1A, a discharge MOS (second field effect transistor) Q2, a resistor R6 and a capacitor C2. A detection circuit is mainly formed by the third operational amplifier U2A and the fourth field effect transistor Q4. And the second operational amplifier U1B, the first field effect transistor Q1 and the switch tube Q3 are used as main components to form a control conducting circuit, and when the charging gun is not connected, the control conducting circuit is forced to be turned off.
When the charging gun is connected, the detection circuit controls the conduction circuit to be opened, the time delay circuit starts timing, and if the single chip microcomputer MCU is awakened, the discharge MOS tube Q2 is controlled to be conducted, so that the time delay circuit is enabled to return to zero. If the MCU is not awakened or enters a sleep mode, the control circuit is turned off after the timing of the delay circuit is finished.
A pull-up resistor R5 is arranged between a charging gun detection contact and a power supply, and is simultaneously connected with a reverse end of a first operational amplifier U1A and a forward end of a third operational amplifier, the same-direction end of the first operational amplifier U1A is connected with a connection point between resistors R1 and R4 which are connected between the power supply and the ground in series, and is connected with a reverse end of the third operational amplifier U2A, the connection point is connected with the forward end of a second operational amplifier U1B through a resistor R7, the output of the first operational amplifier U1A is connected with the reverse end of the second operational amplifier U1B through a resistor R3, a resistor R6 is arranged between the reverse end of the second operational amplifier U1B and the power supply, a capacitor C2 is arranged between the output of the first operational amplifier U1A and the ground, the drain of a discharge MOS tube Q2 is connected with the output of the first operational amplifier U1A, the source is grounded, and the grid of the discharge MOS tube Q2 is powered by a single chip microcomputer output switch S2; the output of the third operational amplifier U2A is connected with the grid of a field effect transistor Q4 and is connected with a power supply through a resistor R9, the drain of the field effect transistor Q4 is connected with the positive end of the second operational amplifier U1B, and the source is grounded; the output of the second operational amplifier U1B is connected with the grid of the field effect transistor Q1 and is connected with the power supply through a resistor R11, the emitter of the switch tube Q3 is connected with the power supply, the collector of the switch tube Q3 is used as the output to supply power for the load R8 and the single chip microcomputer, and the base of the switch tube Q3 is connected with the drain of the first field effect transistor Q1 through a resistor R10.
In this embodiment, the operation states of the present invention are as follows:
1. when the charging gun is not connected, the charging gun is in a standby state, and the current is less than 2 mA.
As shown in fig. 1, taking a 3.3KW charging pile as an example, a 680-ohm resistor is provided in the charging gun, and now S1 is disconnected, which represents that the charging gun is not connected, at this time, the first operational amplifier U1A outputs a low level, the third operational amplifier U2A outputs a high level, the Q4 is turned on, and the reverse input terminal of the second operational amplifier U1B is pulled to 0V. Due to the voltage division of the R6 and the R3, the voltage of the non-inverting input terminal of the second operational amplifier U1B is 0.12V lower than the voltage of the inverting input terminal, so that the second operational amplifier (U1B) outputs a low voltage, Q1 is turned off, the switching tube Q3 is turned off, and 12V cannot supply power to the load R8. The quiescent current is only 1.847mA at this time. The circuit mainly consumes power from 3 comparators.
2. The charging gun is inserted and then works normally.
Referring to fig. 2, the analog charging gun connection is closed by S1, when the equidirectional terminal voltage of the first operational amplifier U1A exceeds the opposite terminal voltage, the first operational amplifier U1A outputs high impedance, the U2A outputs low level, Q4 is cut off, and the equidirectional terminal voltage of the second operational amplifier (U1B) is 6V. Due to the capacitance characteristic of the C2, the voltage at the inverting input terminal of the second operational amplifier (U1B) does not rise immediately, rises slowly, and rises to 6V in 0.18 second. (12V charges C2 through R3 and R6, and the simulation shows that the time is 0.12S, and the RC parameter adjustment time can be adjusted.) in the time of 0.18S, the second operational amplifier (U1B) outputs high level, Q1 is conducted, the switching tube Q3 is driven to be conducted, and 12V can supply power to the rear-end load R8. The single chip microcomputer (the single chip microcomputer can be an OBC main chip) also belongs to one of the loads, a program starts to work after the single chip microcomputer is powered on, the switch S2 is controlled to be closed, the voltage of C2 is completely reduced, the state is stable, and 12V can continuously supply power to the loads. For convenience of simulation modeling, S2 is drawn as a switch in the figure, the actual circuit is that the gate of the discharge MOS transistor Q2 is powered by the output of the single chip, and the discharge MOS transistor Q2 can be turned on only after the single chip works. From the simulation result, the 12V output current is 0.744A in the state, and the operation is normal.
3. The charging gun is connected and can enter a standby mode.
In the application process of the embodiment, if the charging gun is not turned off in time after the charging is completed, the circuit still can enter the low power consumption mode.
After the single chip receives the standby command, as shown in fig. 3, the single chip cuts off the power supply to the gate of the discharge MOS transistor Q2, the discharge MOS transistor Q2 is cut off, and at this time, 12V continues to charge C2 through R6 and R3 until 12V is charged. At this time, the second operational amplifier (U1B) flips and outputs low level, so that Q1 and the switching tube Q3 are cut off, 12V stops supplying power to the load, and the quiescent current is 3.2mA at this time. Although the single chip microcomputer loses power supply after that, the discharge MOS transistor Q2 keeps a cut-off state because the voltage is never output to the gate of the discharge MOS transistor Q2.
If the load circuit needs to be awakened again, the charging gun needs to be disconnected, the U2A outputs high level at the moment, the Q4 is conducted, the C2 potential is returned to zero, and the state returns to the function 1.
According to the circuit, if accounting is carried out according to market price, the total circuit cost is not more than 2 yuan, the cost is greatly reduced compared with the cost of 10 yuan of a low-cost chip circuit, the number of devices is small, the function is reliable, and the cost performance advantage is great.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can be modified or replaced with other embodiments without departing from the spirit and scope of the present invention, and all such modifications and equivalent substitutions are intended to be encompassed by the scope of the following claims.
Claims (7)
1. The utility model provides a detection circuitry is connected to low-cost low-power consumption rifle that charges which characterized in that, this circuit have not connect the rifle standby mode that charges, connect the rifle normal operating mode that charges, and connect the rifle standby mode that charges, it mainly includes: the detection circuit keeps the circuit in a low power consumption mode when a charging gun is not plugged, and the detection circuit firstly starts timing by the delay circuit of the detection circuit after detecting that the charging gun is connected, wakes up the singlechip within preset time, drives the control conduction circuit to turn on the switch, ends the low power consumption mode, can count time again by the delay circuit after the singlechip is dormant, and enters the low power consumption mode after timing for preset time.
2. The connection detection circuit of claim 1, wherein the detection circuit, the delay circuit and the conduction control circuit are composed of three voltage comparators, 3 field effect transistors and 1 switch transistor.
3. The charging gun connection detection circuit with low cost and low power consumption as claimed in claim 2, wherein said delay circuit is mainly composed of a first operational amplifier (U1A), a discharging MOS transistor (Q2), a resistor R6, and a capacitor C2, and said detection circuit mainly comprises a third operational amplifier U2A, a fourth field effect transistor (Q4); the control conducting circuit is mainly composed of a second operational amplifier (U1B), a first field effect transistor (Q1) and a switch tube (Q3), and can forcibly turn off the control conducting circuit when the charging gun is not connected;
when the charging gun is connected, the detection circuit controls the conduction circuit to be opened, the time delay circuit starts to time, if the single chip Microcomputer (MCU) is awakened, the discharge MOS tube (Q2) is controlled to be conducted, the time delay circuit is immediately reset to zero, and if the single chip Microcomputer (MCU) is not awakened or enters a sleep mode, the time delay circuit turns off the control circuit after the time delay circuit finishes the timing.
4. A low cost low power consumption charging gun connection detection circuit according to claim 3, characterized in that: the charging gun resistor is connected between the reverse end of the first operational amplifier (U1A) and the equidirectional end of the third operational amplifier (U2A) and the ground through a connecting interface, at the moment, the equidirectional end voltage of the first operational amplifier (U1A) exceeds the reverse end, the first operational amplifier (U1A) outputs high resistance, the third operational amplifier (U2A) outputs low level, and the fourth field-effect tube (Q4) is cut off, so that the equidirectional end voltage of the second operational amplifier (U1B) is 6V; the voltage of a capacitor (C2) is grounded at the reverse-phase end of the second operational amplifier (U1B) and can rise to 6V within a preset time, in the preset time, the second operational amplifier (U1B) outputs high level, the first field effect transistor (Q1) is conducted, the switching transistor (Q3) is driven to be conducted, and the power supply supplies power to a rear-end load (R8); because the single power supply of the single chip microcomputer is connected with the switching tube (Q3), the program starts to work after the single chip microcomputer is electrified, the detection switch (S2) is controlled to be closed, the voltage of the capacitor (C2) is completely reduced, the state is stable, and the power supply can continuously supply power to the load; after charging is finished, when the single chip receives a standby command, the single chip cuts off power supply of a grid electrode of the discharging MOS tube (Q2), the discharging MOS tube (Q2) is cut off, at the moment, the power supply continues to charge the capacitor (C2) through the resistors R6 and R3 until the power supply is charged to the power supply voltage, at the moment, the second operational amplifier (U1B) overturns to output low level, so that the first field effect tube (Q1) and the switch tube (Q3) are cut off, the power supply stops supplying power to a load, the discharging MOS tube (Q2) keeps a cut-off state, and the standby mode of connecting a charging gun is entered.
5. The low-cost low-power-consumption charging gun connection detection circuit according to claim 4, characterized in that: the detection switch (S2) is controlled by the single chip microcomputer to output power to the grid electrode of the discharge MOS tube (Q2).
6. The low-cost low-power-consumption charging gun connection detection circuit according to claim 4, characterized in that: the power supply charges a capacitor (C2) through resistors R3 and R6, and the preset time can be adjusted by adjusting the RC parameters.
7. A low cost low power consumption charging gun connection detection circuit according to claim 1, characterized in that: the single chip microcomputer is an OBC main chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020779333.XU CN212646807U (en) | 2020-05-12 | 2020-05-12 | Low-cost low-power consumption rifle that charges connects detection circuitry |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020779333.XU CN212646807U (en) | 2020-05-12 | 2020-05-12 | Low-cost low-power consumption rifle that charges connects detection circuitry |
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| CN212646807U true CN212646807U (en) | 2021-03-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113629801A (en) * | 2021-07-15 | 2021-11-09 | 深圳天德钰科技股份有限公司 | Power supply device |
| CN114221399A (en) * | 2021-09-16 | 2022-03-22 | 深圳市瑞晶实业有限公司 | Vehicle charger |
-
2020
- 2020-05-12 CN CN202020779333.XU patent/CN212646807U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113629801A (en) * | 2021-07-15 | 2021-11-09 | 深圳天德钰科技股份有限公司 | Power supply device |
| CN114221399A (en) * | 2021-09-16 | 2022-03-22 | 深圳市瑞晶实业有限公司 | Vehicle charger |
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