Reverse connection prevention charger for safe lithium battery

Abstract

The utility model discloses an anti-reverse connection charger for a safety lithium battery, which relates to the technical field of electric vehicles and comprises a photoelectric coupling module IC6, a trigger diode and a single silicon controlled rectifier QF1, the single silicon controlled rectifier QF1 is arranged at the cathode output end of the charger, the anode of the trigger diode is connected with the anode output end of the charger, and the cathode of the trigger diode is connected with the anode output end of the charger. The negative electrode of the trigger diode DB3 is connected with the control end of the single silicon controlled rectifier QF1; the input end of a light emitter of the photoelectric coupling module IC6 is connected with the first signal port, the output end of the light emitter is grounded, the output end of a light receiver of the photoelectric coupling module IC6 is connected with the positive electrode of the trigger diode through the resistor RF3, and the input end of the light receiver of the photoelectric coupling module IC6 is connected with the auxiliary power supply. Therefore, a door opening pulse can be sent to the lithium battery through the photoelectric coupling module IC6, and the positive electrode and the negative electrode of the lithium battery are judged through the trigger diode and the single silicon controlled rectifier, so that the charger is connected with the safety lithium battery for charging.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, in particular to an anti-reverse connection charger for a safe lithium battery. Background Art

[0002] The input port and output port of the safety lithium battery are separated. The output port supplies power to the electric vehicle, and the input port is used exclusively for charging. The input port is usually closed and has no voltage output. When charging a safety lithium battery, the charger first sends a door-opening pulse to the lithium battery input port to open the input port, and then identifies the positive and negative poles of the lithium battery. If the polarity is correct, charging will begin, and if the polarity is opposite, charging will be rejected.

[0003] Currently, thyristors can be used to determine the positive and negative poles of lithium batteries, but thyristors are connected to the negative output terminal of the charger, and there is no way to send a common ground gate-opening pulse signal to the lithium battery, and thus the lithium battery input terminal cannot be opened. Therefore, it is urgent to design a circuit that can send a gate-opening pulse to the lithium battery to open the lithium battery input port and can determine the positive and negative poles of the lithium battery. Utility Model Content

[0004] Based on the above problems, the utility model provides an anti-reverse connection charger for safe lithium batteries, which can send a door opening pulse to the lithium battery to open the lithium battery input port, and can distinguish the positive and negative poles of the lithium battery to realize charging of the safe lithium battery.

[0005] The utility model embodiment discloses the following technical solution:

[0006] In a first aspect, the present application provides an anti-reverse connection charger for a safe lithium battery, comprising an optocoupler module IC6 and an anti-reverse connection circuit arranged at the output end of the charger;

[0007] The anti-reverse connection circuit includes a trigger diode DB3 and a single thyristor QF1, wherein the single thyristor QF1 is arranged at the negative output terminal of the charger, the positive electrode of the trigger diode is connected to the positive output terminal of the charger, and the negative electrode of the trigger diode DB3 is connected to the control terminal of the single thyristor QF1;

[0008] The input end of the light emitter of the photoelectric coupling module IC6 is connected to the first signal port, the output end of the light emitter is grounded, the output end of the light receiver of the photoelectric coupling module IC6 is connected to the positive electrode of the trigger diode through the resistor RF3, and the input end of the light receiver of the photoelectric coupling module IC6 is connected to the auxiliary power supply.

[0009] Optionally, it also includes an optical coupling module IC7, wherein the input end of the light emitter of the optical coupling module IC7 is connected to the cathode of the diode D1, the anode of the diode D1 is connected to the cathode output end of the charger, the output end of the light emitter is connected to the cathode output end of the charger, the input end of the light receiver of the optical coupling module IC7 is connected to the cathode of the trigger diode DB3, the output end of the light receiver is connected to the anode of the single thyristor QF1, and a capacitor CF1 is connected between the cathode of the trigger diode DB3 and the anode of the single thyristor QF1.

[0010] Optionally, it also includes an optical coupling module IC8, wherein the input end of the light emitter of the optical coupling module IC8 is connected to the cathode of the diode D1, the output end of the light emitter is connected to the positive output end of the charger, the input end of the light receiver of the optical coupling module IC8 is connected to the second signal port 2 for cutting off the signal of the lithium battery input end, the output end of the light receiver of the optical coupling module IC8 is grounded, and the input end of the light receiver of the optical coupling module IC8 is also connected to the third signal port.

[0011] Optionally, it also includes a diode DF1, a resistor RF1, a resistor RF2, a resistor RF3 and a transistor;

[0012] The positive electrode of the diode DF1 is connected to the positive output terminal of the charger, the negative electrode of the diode DF1 is connected to the emitter of the transistor, the collector of the transistor is connected to the first end of the resistor RF3, the second end of the resistor RF3 is connected to the positive electrode of the trigger diode, the negative electrode of the diode DF1 is also connected to the first end of the resistor RF1, the second end of the first end of the resistor RF1 is connected to the base of the transistor, and a capacitor is also connected between the first end of the resistor RF1 and the second end of the resistor RF1; the base of the transistor is also connected to the first section of the resistor RF2, and the second end of RF2 is connected to the negative output terminal of the charger.

[0013] Optionally, the cathode of the light emitter of the photoelectric coupling module IC6 is connected to the anode of the diode DA2, and the cathode of the diode DA2 is connected to the first end of the resistor RF3.

[0014] Optionally, the cathode of the diode D1 is connected to the first end of the resistor group, and the second end of the resistor group is connected to the anode of the light emitter of the optical coupling module IC7 and the anode of the light emitter of the optical coupling module IC8.

[0015] Optionally, the resistor group includes a resistor RK1, a resistor RK2, a resistor RK1A and a resistor RK2A, the first end of the resistor RK1 and the first end of the resistor RK1A are connected to the same node as the first end of the resistor group, the second end of the resistor RK1 is connected to the first end of the resistor RK2, the second end of the resistor RK1A is connected to the first end of the resistor RK2A, and the second end of the resistor RK2 and the second end of the resistor RK2A are connected to the same node as the second end of the resistor group.

[0016] Optionally, the auxiliary power supply is connected to the first end of the resistor RA, the second end of the resistor RA is grounded, the second end of the resistor RA is also connected to the negative electrode of the capacitor CA1, the positive electrode of the capacitor CA1 is connected to the negative electrode of the diode DA1, the positive electrode of the DA1 is connected to the first output end of the power supply secondary winding, and the second output end of the secondary winding is grounded.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model provides a reverse connection protection charger for safe lithium batteries, comprising a photoelectric coupling module IC6 and a reverse connection protection circuit arranged at the output end of the charger; the reverse connection protection circuit comprises a trigger diode and a single thyristor QF1, the single thyristor QF1 is arranged at the negative output end of the charger, the positive pole of the trigger diode is connected to the positive output end of the charger, and the negative pole of the trigger diode DB3 is connected to the control end of the single thyristor QF1; the input end of the light emitter of the photoelectric coupling module IC6 is connected to the first signal port, the output end of the light emitter is grounded, the output end of the light receiver of the photoelectric coupling module IC6 is connected to the positive pole of the trigger diode through a resistor RF3, and the input end of the light receiver of the photoelectric coupling module IC6 is connected to an auxiliary power supply. In this way, the first signal port of the photoelectric coupling module IC6 generates a pulse signal, and the light receiver of the photoelectric coupling module IC6 sends a gate opening pulse to the input port of the lithium battery, the charger is connected to the lithium battery, and the input port of the lithium battery is opened. When the polarity of the connection is correct, the input end of the diode will be triggered to reach the trigger condition, thereby controlling the single thyristor QF1 to open and charge. Thereby, a door opening pulse is sent to the lithium battery to open the lithium battery input port, and the positive and negative poles of the lithium battery can be identified to realize the charging of the safe lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 The utility model provides a circuit structure schematic diagram of an anti-reverse connection charger for a safe lithium battery.

[0021] As shown in the figure

[0022] 1-first signal port 1; 2-second signal port; 3-third signal port. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] First, see Figure 1 The diagram shown is a circuit structure diagram of a reverse connection protection charger for a safe lithium battery.

[0025] A reverse connection protection charger for a safe lithium battery, comprising a photoelectric coupling module IC6 and a reverse connection protection circuit arranged at the output end of the charger;

[0026] The reverse connection protection circuit includes a trigger diode DB3 and a single thyristor QF1, wherein the single thyristor QF1 is arranged at the negative output terminal of the charger (see Figure 1 OUT- in the figure, the anode of the trigger diode is connected to the positive output terminal of the charger, and the cathode of the trigger diode DB3 is connected to the control terminal of the single thyristor QF1; the input terminal of the light emitter of the photoelectric coupling module IC6 is connected to the first signal port, the output terminal of the light emitter is grounded, the output terminal of the light receiver of the photoelectric coupling module IC6 is connected to the anode of the trigger diode through the resistor RF3, and the input terminal of the light receiver of the photoelectric coupling module IC6 is connected to the auxiliary power supply.

[0027] The lithium battery in this application is a safe lithium battery.

[0028] Furthermore, the cathode of the light emitter of the photoelectric coupling module IC6 is connected to the anode of the diode DA2, and the cathode of the diode DA2 is connected to the first end of the resistor RF3.

[0029] Specifically, the above Figure 1The anti-reverse connection charger for safe lithium batteries is shown. The first signal port of the photoelectric coupling module IC6 generates a pulse signal. The light receiving side of the photoelectric coupling module IC6 sends a gate opening pulse to the input port of the lithium battery. The charger is connected to the lithium battery, and the input port of the lithium battery is opened. When the polarity of the connection is correct, the trigger diode will reach the trigger condition (for example, the trigger condition is that the voltage is greater than 28V), and then the single thyristor QF1 is controlled to open for charging. Thus, the gate opening pulse is sent to the lithium battery to open the lithium battery input port, and the positive and negative poles of the lithium battery can be distinguished, so as to realize the charging of the safe lithium battery.

[0030] Therefore, the present application can send a door opening pulse to the lithium battery to open the lithium battery input port, and can also identify the positive and negative poles of the lithium battery to enable charging of the safe lithium battery.

[0031] In a possible implementation, the above circuit may also include an optical coupling module IC7, wherein the input end of the light emitter of the optical coupling module IC7 is connected to the cathode of the diode D1, the anode of the diode D1 is connected to the cathode output end of the charger, the output end of the light emitter is connected to the cathode output end of the charger, the input end of the light receiver of the optical coupling module IC7 is connected to the cathode of the trigger diode DB3, the output end of the light receiver is connected to the anode of the single thyristor QF1, and a capacitor CF1 is connected between the cathode of the trigger diode DB3 and the anode of the single thyristor QF1.

[0032] Specifically, since the input end of the light emitter of the optical coupling module IC7 is connected to the negative pole of the charger, and the output end of the light emitter of the optical coupling module IC7 is connected to the positive pole of the charger, when the polarity of the charger and the lithium battery is reversed, the input end of the light receiver of the optical coupling module IC7 is connected to the negative pole of the trigger diode, and the trigger diode is controlled to fail to reach the trigger condition, and the single thyristor cannot be turned on. In this way, when the polarity of the charger and the lithium battery is reversed, the single thyristor can be controlled to be unable to conduct.

[0033] It should be noted that the charger and lithium battery polarity can be reversed. Figure 1 The OUT+ in the figure is connected to the negative input terminal of the lithium battery, and the negative output terminal of the charger (see Figure 1 OUT- in the figure is connected to the positive input terminal of the lithium battery.

[0034] In a possible implementation, the above circuit may further include an optical coupling module IC8, wherein the input end of the light emitter of the optical coupling module IC8 is connected to the cathode of the diode D1, the output end of the light emitter is connected to the positive output end of the charger, the input end of the light receiver of the optical coupling module IC8 is connected to the second signal port 2 for cutting off the signal of the lithium battery input end, the output end of the light receiver of the optical coupling module IC8 is grounded, and the input end of the light receiver of the optical coupling module IC8 is also connected to the third signal port 3.

[0035] Specifically, if the polarity of the charger and the lithium battery is reversed, a command to stop the pulse signal can be sent through the second signal port 2 to control the photoelectric coupling module IC6 to stop sending the pulse signal, and the charger is immediately in a non-charging protection state.

[0036] The third signal port 3 provides a stable 5V voltage for the input terminal of the light receiver of the optical coupling module IC8.

[0037] In a possible implementation, it also includes a diode DF1, a resistor RF1, a resistor RF2, a resistor RF3 and a transistor; the positive electrode of the diode DF1 is connected to the positive output terminal of the charger, the negative electrode of the diode DF1 is connected to the emitter of the transistor, the collector of the transistor is connected to the first end of the resistor RF3, the second end of the resistor RF3 is connected to the positive electrode of the trigger diode, the negative electrode of the diode DF1 is also connected to the first end of the resistor RF1, the second end of the first end of the resistor RF1 is connected to the base of the transistor, and a capacitor is also connected between the first end of the resistor RF1 and the second end of the resistor RF1; the base of the transistor is also connected to the first section of the resistor RF2, and the second end of RF2 is connected to the negative output terminal of the charger.

[0038] In a possible implementation, the cathode of the diode D1 is connected to a first end of a resistor group, and the second end of the resistor group is connected to an anode of the light emitter of the optical coupling module IC7 and an anode of the light emitter of the optical coupling module IC8.

[0039] Optionally, the above-mentioned resistor group may include a resistor RK1, a resistor RK2, a resistor RK1A and a resistor RK2A, the first end of the resistor RK1 and the first end of the resistor RK1A are connected to the same node as the first end of the resistor group, the second end of the resistor RK1 is connected to the first end of the resistor RK2, the second end of the resistor RK1A is connected to the first end of the resistor RK2A, and the second end of the resistor RK2 and the second end of the resistor RK2A are connected to the same node as the second end of the resistor group.

[0040] Optionally, the auxiliary power supply is connected to the first end of the resistor RA, the second end of the resistor RA is grounded, the second end of the resistor RA is also connected to the negative electrode of the capacitor CA1, the positive electrode of the capacitor CA1 is connected to the negative electrode of the diode DA1, the positive electrode of the DA1 is connected to the first output end of the power supply secondary winding, and the second output end of the secondary winding is grounded.

[0041] Specifically, an external power source may be connected to provide a required voltage value for the auxiliary power source in a winding manner.

[0042] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reverse connection protection charger for safe lithium batteries, characterized in that: It includes a photoelectric coupling module IC6 and an anti-reverse connection circuit arranged at the output end of the charger; The anti-reverse connection circuit includes a trigger diode DB3 and a single thyristor QF1, wherein the single thyristor QF1 is arranged at the negative output terminal of the charger, the positive electrode of the trigger diode is connected to the positive output terminal of the charger, and the negative electrode of the trigger diode DB3 is connected to the control terminal of the single thyristor QF1; The input end of the light emitter of the photoelectric coupling module IC6 is connected to the first signal port, the output end of the light emitter is grounded, the output end of the light receiver of the photoelectric coupling module IC6 is connected to the positive electrode of the trigger diode through the resistor RF3, and the input end of the light receiver of the photoelectric coupling module IC6 is connected to the auxiliary power supply.

2. The charger according to claim 1, characterized in that: It also includes an optical coupling module IC7, wherein the input end of the light emitter of the optical coupling module IC7 is connected to the cathode of the diode D1, the anode of the diode D1 is connected to the cathode output end of the charger, the output end of the light emitter is connected to the cathode output end of the charger, the input end of the light receiver of the optical coupling module IC7 is connected to the cathode of the trigger diode DB3, the output end of the light receiver is connected to the anode of the single thyristor QF1, and a capacitor CF1 is connected between the cathode of the trigger diode DB3 and the anode of the single thyristor QF1.

3. The charger according to claim 2, characterized in that: It also includes an optical coupling module IC8, wherein the input end of the light emitter of the optical coupling module IC8 is connected to the cathode of the diode D1, the output end of the light emitter is connected to the positive output end of the charger, the input end of the light receiver of the optical coupling module IC8 is connected to the second signal port for cutting off the signal of the input end of the lithium battery, the output end of the light receiver of the optical coupling module IC8 is grounded, and the input end of the light receiver of the optical coupling module IC8 is also connected to the third signal port.

4. The charger according to claim 1, characterized in that: It also includes a diode DF1, a resistor RF1, a resistor RF2, a resistor RF3 and a triode; The positive electrode of the diode DF1 is connected to the positive output terminal of the charger, the negative electrode of the diode DF1 is connected to the emitter of the transistor, the collector of the transistor is connected to the first end of the resistor RF3, the second end of the resistor RF3 is connected to the positive electrode of the trigger diode, the negative electrode of the diode DF1 is also connected to the first end of the resistor RF1, the second end of the first end of the resistor RF1 is connected to the base of the transistor, and a capacitor is also connected between the first end of the resistor RF1 and the second end of the resistor RF1; the base of the transistor is also connected to the first section of the resistor RF2, and the second end of RF2 is connected to the negative output terminal of the charger.

5. The charger according to claim 4, characterized in that: The cathode of the light emitter of the photoelectric coupling module IC6 is connected to the anode of the diode DA2, and the cathode of the diode DA2 is connected to the first end of the resistor RF3.

6. The charger according to claim 3, characterized in that: The cathode of the diode D1 is connected to the first end of the resistor group, and the second end of the resistor group is connected to the anode of the light emitter of the optical coupling module IC7 and the anode of the light emitter of the optical coupling module IC8.

7. The charger according to claim 6, characterized in that: The resistor group includes a resistor RK1, a resistor RK2, a resistor RK1A and a resistor RK2A, the first end of the resistor RK1 and the first end of the resistor RK1A are connected to the same node as the first end of the resistor group, the second end of the resistor RK1 is connected to the first end of the resistor RK2, the second end of the resistor RK1A is connected to the first end of the resistor RK2A, and the second end of the resistor RK2 and the second end of the resistor RK2A are connected to the same node as the second end of the resistor group.

8. The charger according to claim 1, characterized in that: The auxiliary power supply is connected to the first end of the resistor RA, the second end of the resistor RA is grounded, the second end of the resistor RA is also connected to the negative electrode of the capacitor CA1, the positive electrode of the capacitor CA1 is connected to the negative electrode of the diode DA1, the positive electrode of the DA1 is connected to the first output end of the power supply secondary winding, and the second output end of the secondary winding is grounded.

Images