CN202737533U - Circuit structure used for vehicle storage battery discharging management - Google Patents

Abstract

The utility model relates to a circuit structure used for vehicle storage battery discharging management. The utility model aims to provide the circuit structure capable of cutting off a power supply loop, including a power loop of a controller itself, of an electric device automatically, thereby preventing the overcharge of a storage battery. The circuit structure used for the vehicle storage battery discharging management includes the storage battery, a switch and a vehicle electric device. The switch controls the storage battery to supply power for the vehicle electric device. The circuit structure used for the vehicle storage battery discharging management is also characterized in that the circuit structure used for the vehicle storage battery discharging management includes a vehicle body controller, a control switch, a capacitor, a PNP-type triode, a NPN-type triode, a first switch diode, a second switch diode and a pull-up resistor. The switch is a double-pull double-throw switch. In a preferred embodiment, the vehicle body controller is a single-chip microprocessor and the control switch is a relay switch.

Description

Circuit structure of vehicle battery discharge management

technical field

The utility model relates to a power supply discharge management circuit structure, in particular to a discharge management circuit structure which should be used on a vehicle storage battery power supply. the

Background technique

At present, when the engine of the car is stopped, the power supply of the electrical equipment comes from the battery, and the electrical switch on the car is mainly controlled by a mechanical switch. When the switch is always on, the electrical equipment will continue to consume the power on the battery until All the electricity in the storage battery is exhausted, which not only affects the user's use of the vehicle but also shortens the life of the storage battery. the

Utility model content

Aiming at the deficiencies in the prior art, the utility model aims to provide a circuit structure that can automatically cut off the power supply circuit of the electrical equipment, including a circuit structure of the controller's own power circuit to prevent the battery from being over-discharged. the

In order to solve the above problems, a vehicle battery discharge management circuit structure of the utility model includes a battery, a switch and a vehicle electrical appliance, and the switch controls the battery to supply power to the vehicle electrical appliance. The vehicle battery discharge management circuit structure is characterized in that it also includes :

Body controller, control switch, capacitor, PNP transistor, NPN transistor, first switch diode, second switch diode and pull-up resistor; the switch is a double-pole double-throw switch;

The control switch is connected in series between the positive pole of the battery and the positive pole of the vehicle electrical appliance, the negative poles of the battery and the vehicle electrical appliance are respectively grounded, the first common contact of the double pole double throw switch is connected to the positive pole of the battery, and the second common contact is connected to the positive pole of the battery. The point is connected to the negative pole of the battery through a capacitor;

The emitter of the PNP transistor is connected to the first normally open contact of the double-pole double-throw switch, the collector is connected to the Vcc end of the vehicle body controller, and the base is connected to the collector of the NPN transistor. The pull-up resistor is connected in parallel between the emitter and the base of the triode;

The base of the NPN transistor is connected to the second normally open contact of the double-pole double-throw switch through the first switch diode, and the emitter is grounded. The base of the NPN transistor is also connected to the second switch diode through the second normally open contact. The level output terminal of the body controller is connected, and the cathodes of the first switching diode and the second switching diode are respectively connected to the base of the NPN transistor;

The control terminal of the vehicle body controller is connected to the control terminal of the control switch, and the Vss terminal is grounded;

The body controller controls the opening and closing of the control switch through the high/low level output of the level output terminal, thereby controlling the battery to supply power to the vehicle electrical appliances. the

Preferably, the vehicle body controller is a single chip microcomputer, and the control switch is a relay switch. the

The beneficial effect of the utility model is that the controller can not only cut off the power supply circuit of the electrical equipment according to the state of the storage battery, but also can cut off the power supply circuit of itself. The structure is simple, the number of components is small, the leakage current is extremely small when the power circuit is cut off, it is safe and reliable, and it can protect the battery from over-discharge to the greatest extent. the

Description of drawings

Fig. 1 is the circuit schematic diagram of the utility model. the

Description of main symbols

K1, double pole double throw switch C1, capacitor

Q1, PNP transistor Q2, NPN transistor

D1, the first switching diode D2, the second switching diode

R1, pull-up resistor B1, battery

Detailed ways

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

As shown in Figure 1, a discharge management circuit structure of a vehicle battery of the present invention includes a battery B1, a double-pole double-throw switch K1, a vehicle electrical appliance, a vehicle body controller, a control switch, a capacitor C1, and a PNP transistor Q1 , NPN transistor Q2, a first switching diode D1, a second switching diode D2 and a pull-up resistor R1. The double-pole double-throw switch K1 is composed of two single-pole double-throw switches in parallel. Each single-pole double-throw switch has three contacts, including a normally open contact, a normally closed contact and a common contact. A single pole double throw switch has a first normally open contact, a first normally closed contact and a first common contact, and correspondingly, a second single pole double throw switch has a second normally open contact, a second normally closed contact and Second common contact. The vehicle body controller (MCU) is preferably a single chip microcomputer, and the control switch is a relay switch. the

The connection mode of each device is: the control switch is connected in series between the positive pole of the battery B1 and the positive pole of the vehicle electrical appliance, the negative poles of the battery B1 and the vehicle electrical appliance are respectively grounded, and the first common contact of the double pole double throw switch K1 It is connected to the positive pole of the battery B1, and the second common contact is connected to the negative pole of the battery B1 through the capacitor C1. the

The emitter of the PNP transistor Q1 is connected to the first normally open contact of the double-pole double-throw switch K1, the collector is connected to the Vcc terminal of the vehicle body controller, and the base is connected to the collector of the NPN transistor Q2. The pull-up resistor R1 is parallel connected between the emitter and the base of the PNP transistor Q1. the

The base of the NPN transistor Q2 is connected to the second normally open contact of the double-pole double-throw switch K1 through the first switch diode D1, and the emitter is grounded, and the base of the NPN transistor Q2 is also connected to the second switch through the second switch. The diode D2 is connected to the level output terminal P1 of the body controller, and the cathodes (negative direction) of the first switching diode D1 and the second switching diode D2 are respectively connected to the base of the NPN transistor Q2. the

The control end of the vehicle body controller is connected to the control end of the control switch, and the Vss end is grounded. the

When the body controller outputs a high level through the level output terminal P1, the control switch is turned on through the control terminal, and the battery B1 supplies power for the vehicle electrical appliances. When the body controller outputs a low level through the level output terminal P1, it is controlled through the control terminal. When the switch is closed, the battery B1 stops supplying power to the vehicle electrical appliances. the

The specific working principle of this circuit is: when the double pole double throw switch K1 is turned to the OFF position, the battery B1 charges the capacitor C1, when the double pole double throw switch is turned on and turned to the ON position, the capacitor C1 is recharged Through the discharge of the base of the NPN transistor Q2, the NPN transistor Q2 is turned on and the PNP transistor Q1 is turned on. At this time, the controller is powered on. Before the capacitor C1 is fully discharged, the controller outputs a high voltage through the level output terminal P1. The level is taken over by the second switching diode D2 to take over the base current required by the NPN transistor Q2 to make the NPN transistor Q2 continue to conduct, so the controller can continue to be powered on, and at the same time the control terminal turns on the relay control switch, so that the vehicle electrical appliances electricity. The automatic shutdown process is that when the battery controller detects that the battery is insufficient, that is, when the battery controller judges that continuous discharge is harmful to the battery, it will send a signal to the body controller, and the body controller will output a low-battery voltage through the level output terminal P1. Ping can turn off the NPN type transistor Q2, causing the PNP type transistor Q1 to be turned off, so that the body controller is powered off, and the relay control switch is also turned off simultaneously, so that the battery B1 stops supplying power to the electrical equipment. the

Claims (2)

1. a discharging process of automobile battery management circuit structure comprises storage battery (B1), switch (K1) and vehicular electrical appliance, and switch control storage battery is powered to vehicular electrical appliance, and this discharging process of automobile battery management circuit structure is characterised in that also and comprises:

Car body controller, control switch, electric capacity (C1), positive-negative-positive triode (Q1), NPN type triode (Q2), the first switching diode (D1), second switch diode (D2) and pull-up resistor (R1); Described switch (K1) is double-point double-throw switch;

The described control switch of connecting between the positive pole of storage battery (B1) and the positive pole of vehicular electrical appliance, the negative pole of storage battery (B1) and vehicular electrical appliance is ground connection respectively, the first common of described double-point double-throw switch (K1) is connected with the positive pole of storage battery (B1), and the second common is connected with the negative pole of storage battery (B1) by electric capacity (C1);

The emitter of positive-negative-positive triode (Q1) is connected with the first normally opened contact of double-point double-throw switch (K1), collector electrode is connected with the Vcc end of described car body controller, base stage is connected with the collector electrode of described NPN type triode (Q2), between the emitter of this positive-negative-positive triode (Q1) and the base stage and be connected to described pull-up resistor (R1);

The base stage of NPN type triode (Q2) is connected with the second normally opened contact of double-point double-throw switch (K1) by described the first switching diode (D1), grounded emitter, the base stage of this NPN type triode (Q2) also is connected with the level output end (P1) of described car body controller by described second switch diode (D2), and this first switching diode (D1) is connected D2 with the second switch diode) negative pole be connected with the base stage of described NPN type triode (Q2) respectively;

The control end of described car body controller is connected with the control end of described control switch, and Vss holds ground connection;

Car body controller is by the high/low level of the output of level output end (P1), and the folding of control control switch is powered thereby the control storage battery is vehicular electrical appliance.

2. discharging process of automobile battery management circuit structure according to claim 1, it is characterized in that: described car body controller is single-chip microcomputer, described control switch is relay switch.

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