Lead-acid battery charger

Abstract

The utility model discloses a lead-acid battery charger, which relates to the technical field of electric vehicles, and comprises a sampling module, a power amplifier and a controller, the first end of the sampling module is connected with the anode output end of the charger, and the second end of the sampling module is connected with the cathode output end of the charger. A signal output end of the sampling module is connected with a first port of the control module, the first port is connected with a control end of an anti-reverse connection circuit of the charger, and a second port, used for outputting charging frequency signals, of the controller is connected with an input end of the power amplifier. And the output end of the power amplifier is connected with the signal output end of the sampling module. Therefore, by comparing the sampling signal with the reference voltage signal in the controller and adjusting the sampling signal, the problem that the charging voltage is increased blindly to damage the battery is avoided, and the charging frequency signal conforming to the characteristics of the battery electrolyte is output, so that the reduction reaction of the electrolyte is accelerated, and the charger can charge more fully.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, in particular to a lead-acid battery charger. Background Art

[0002] There are many types of lead-acid battery chargers (hereinafter referred to as chargers) on the market, but no matter how they change, the basic charging principle is inseparable from the three processes of constant current charging, constant voltage charging, and floating charging (trickle charging). Some small companies, due to lack of R&D capabilities, blindly increase the charging voltage, cut one of the processes into several sections, turning it into a "multi-stage" charging, and add various indicator lights to make their chargers look high-end. However, the indicator light of the charger shows that the battery is fully charged, but the electric car cannot run far, and blindly increasing the charging voltage not only causes great damage to the battery. Utility Model Content

[0003] Based on the above problems, the utility model provides a lead-acid battery charger to solve the problems of blindly increasing the charging voltage, causing inaccurate charging, affecting the driving range of the tram and damaging the battery.

[0004] The utility model embodiment discloses the following technical solution:

[0005] In the first aspect, the present application provides a lead-acid battery charger, comprising a sampling module, a power amplifier and a controller, wherein the first end of the sampling module is connected to the positive output end of the charger, the second end of the sampling module is connected to the negative output end of the charger, the signal output end of the sampling module is connected to the first port of the control module, the first port is connected to the control end of the anti-reverse connection circuit of the charger, the second port of the controller for outputting a charging frequency signal is connected to the input end of the power amplifier, and the output end of the power amplifier is connected to the signal output end of the sampling module.

[0006] Optionally, the sampling module includes a first resistor group and a second resistor group, the first end of the first resistor group is connected to the positive output terminal of the charger, the second end of the first resistor is the signal output terminal of the sampling module, the first end of the second resistor group is connected to the signal output terminal of the sampling module, the second end of the second resistor group is grounded, and the second end of the second resistor group is also connected to the negative output terminal of the charger.

[0007] Optionally, the first resistor group includes a resistor R1 and a resistor R1A, the first end of the resistor R1 and the first end of the resistor R1A are connected to the same node as the input end of the first resistor group, and the second end of the resistor R1 and the second end of the resistor R1A are connected to the same node as the output end of the first resistor group.

[0008] Optionally, the second resistor group includes a resistor R2 and a resistor R2A, the first end of the resistor R2 and the first end of the resistor R2A are connected to the same node as the input end of the second resistor group, and the second end of the resistor R2 and the second end of the resistor R2A are connected to the same node as the output end of the second resistor group.

[0009] Optionally, the power amplifier includes a transistor QS1, the first port is connected to the base of the transistor QS1, the collector of the transistor QS1 is connected to the signal output end of the sampling module, the emitter of the transistor QS1 is connected to the ground, and the emitter of the transistor QS1 is also connected to the negative output end of the charger.

[0010] Optionally, the first port is connected to a first end of a resistor R3 , and a second end of the resistor R3 is connected to a base of the transistor QS1 .

[0011] Optionally, the collector of the transistor QS1 is connected in series with resistors R4 and R5 in sequence, an end of the resistor R5 away from the resistor R4 is connected to the signal output end of the sampling module, an end of the resistor R5 away from the resistor R4 is connected to capacitor C1, and a second end of the capacitor C1 is connected to the negative output end of the charger.

[0012] Optionally, the second end of the sampling module is connected to the first end of the resistor R6, and the second end of the resistor R6 is connected to the negative output end of the charger.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model provides an anti-reverse connection charger for safe lithium batteries, comprising a sampling module, a power amplifier and a controller, wherein the first end of the sampling module is connected to the positive output end of the charger, the second end of the sampling module is connected to the negative output end of the charger, the signal output end of the sampling module is connected to the first port of the control module, the first port is connected to the control end of the anti-reverse connection circuit of the charger, the second port of the controller for outputting a charging frequency signal is connected to the input end of the power amplifier, and the output end of the power amplifier is connected to the signal output end of the sampling module. Thus, the sampling module can perform voltage sampling on the output end of the charger to determine the current actual voltage, compare the sampling signal with the reference voltage signal in the controller through the second port, adjust the sampling signal, avoid the problem of blindly increasing the charging voltage to damage the battery, further, according to the adjusted sampling signal, the controller outputs a frequency signal that meets the characteristics of the battery electrolyte at the first port, and the second port controls the anti-reverse connection circuit of the charger to be turned on and off based on the frequency signal, thereby controlling the charger to output a charging frequency signal that meets the characteristics of the battery electrolyte, thereby accelerating the reduction reaction of the electrolyte, so that the charger can charge more fully. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 The utility model provides a circuit structure diagram of a lead-acid battery charger;

[0017] Figure 2 A schematic diagram of a constant voltage section "sieve" pulse is provided for the utility model. DETAILED DESCRIPTION

[0018] 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.

[0019] First, see Figure 1 A schematic diagram of the circuit structure of a lead-acid battery charger is shown. Specifically, a lead-acid battery charger includes a sampling module, a power amplifier and a controller;

[0020] The first end of the sampling module is connected to the positive output end of the charger, the second end of the sampling module is connected to the negative output end of the charger, the signal output end of the sampling module is connected to the first port of the control module, the first port is connected to the control end of the anti-reverse connection circuit of the charger, the second port of the controller for outputting the charging frequency signal is connected to the input end of the power amplifier, and the output end of the power amplifier is connected to the signal output end of the sampling module.

[0021] For example, see Figure 2 A schematic diagram of a constant voltage section "sieve" pulse is shown. When entering the constant voltage section according to the voltage of the battery, during the charging time of the constant voltage section, the actual voltage value of the positive output terminal of the charger is obtained in real time by sampling the current, and the voltage value finally output to the battery is adjusted according to the reference voltage value, and the charging frequency signal is determined according to the electrolyte characteristic output of the battery and the duration of the current constant voltage section, for example, a "sieve" pulse is formed according to the duration of alternating high level (such as the voltage value finally output to the battery mentioned above) and low level (such as 0V).

[0022] The above charging frequency signal matches the electrolyte characteristics of the battery, so that the charger output end outputs a power-driven "sieve" voltage pulse group, which accelerates the reduction reaction of the battery's electrolyte, allowing the battery to release more space to accommodate the charging charge sent by the charger, so that the battery can be charged more solidly and fully, and the travel distance can be longer.

[0023] The above-mentioned reverse connection protection circuit can adopt a conventional single thyristor reverse connection protection circuit in a charger, which is used to connect the negative input terminal of the battery to be charged at the positive output terminal of the charger. When the negative output terminal of the charger is connected to the positive input terminal of the battery to be charged and the polarity is reversed, the single thyristor reverse connection protection circuit can include a single thyristor and a trigger diode for triggering the single thyristor to turn on the negative output terminal circuit of the charger.

[0024] The second port is connected to the trigger diode, and by outputting a charging frequency signal, when the level is high, the single thyristor is turned on, thereby turning on the connection circuit between the charger and the battery; when the level is low, the single thyristor is turned off, thereby stopping the connection circuit between the charger and the battery, thereby forming the required charging frequency.

[0025] The matching network mentioned above may be a circuit formed by two resistors connected in series, or a circuit formed by a combination of a resistor and a capacitor.

[0026] Based on the above Figure 1 A circuit structure diagram of a lead-acid battery charger is provided, wherein the sampling module can perform voltage sampling on the output end of the charger to determine the current actual voltage, compare the sampling signal with the reference voltage signal in the controller through the second port, adjust the sampling signal, and output a frequency signal that meets the characteristics of the battery electrolyte through the controller at the first port according to the adjusted sampling signal, and the second port controls the conduction and cutoff of the charger's anti-reverse connection circuit based on the frequency signal to control the charger to output a charging frequency signal that meets the characteristics of the battery electrolyte, thereby accelerating the reduction reaction of the electrolyte and enabling the charger to charge more fully.

[0027] Optionally, the sampling module can be used to obtain the voltage value actually output by the charger by connecting the positive output terminal of the charger through the sampling module when the battery charging enters the constant voltage stage. This is to facilitate the subsequent adjustment of the actual output voltage value based on the reference voltage value corresponding to the constant voltage stage pre-stored in the controller. For example, when the actual voltage value collected is higher than the reference voltage value, the voltage output by the positive output terminal of the charger can be adjusted based on the difference between the actual voltage value and the reference voltage value.

[0028] In addition, the sampling module can also be used when the battery charging enters the constant current stage. The sampling module is connected to the negative output terminal of the charger to obtain the actual output current value of the charger, so as to adjust the actual output current value based on the reference current value corresponding to the constant current stage pre-stored in the controller.

[0029] In one implementation, the sampling module may include a first resistor group and a second resistor group, wherein the first end of the first resistor group is connected to the positive output end of the charger, the second end of the first resistor is the signal output end of the sampling module, the first end of the second resistor group is connected to the signal output end of the sampling module, the second end of the second resistor group is grounded, and the second end of the second resistor group is also connected to the negative output end of the charger.

[0030] Furthermore, the first resistor group includes a resistor R1 and a resistor R1A, the first end of the resistor R1 and the first end of the resistor R1A are connected to the same node as the input end of the first resistor group, and the second end of the resistor R1 and the second end of the resistor R1A are connected to the same node as the output end of the first resistor group.

[0031] Furthermore, the second resistor group includes a resistor R2 and a resistor R2A, the first end of the resistor R2 and the first end of the resistor R2A are connected to the same node as the input end of the second resistor group, and the second end of the resistor R2 and the second end of the resistor R2A are connected to the same node as the output end of the second resistor group.

[0032] The actual voltage value output from the positive output terminal of the charger is determined by the voltage division of the first resistor group and the second resistor group.

[0033] Optionally, the power amplifier includes a transistor QS1, the first port is connected to the base of the transistor QS1, the collector of the transistor QS1 is connected to the signal output end of the sampling module, the emitter of the transistor QS1 is connected to the ground, and the emitter of the transistor QS1 is also connected to the negative output end of the charger.

[0034] In a possible implementation manner, a power follower may also be configured correspondingly to the power amplifier.

[0035] In one implementation, the first port is connected to a first end of a resistor R3 , and a second end of the resistor R3 is connected to a base of the transistor QS1 .

[0036] In one implementation, the collector of the transistor QS1 is connected in series with resistors R4 and R5 in sequence, an end of the resistor R5 away from the resistor R4 is connected to the signal output end of the sampling module, an end of the resistor R5 away from the resistor R4 is connected to the capacitor C1, and the second end of the capacitor C1 is connected to the negative output end of the charger.

[0037] In one implementation, the second end of the sampling module is connected to the first end of the resistor R6, and the second end of the resistor R6 is connected to the negative output end of the charger.

[0038] Specifically, an external power source may be connected to provide a required voltage value for the auxiliary power source in a winding manner.

[0039] 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.

[0040] 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 lead-acid battery charger, It is characterized in that It includes a sampling module, a power amplifier and a controller, wherein the first end of the sampling module is connected to the positive output end of the charger, the second end of the sampling module is connected to the negative output end of the charger, the signal output end of the sampling module is connected to the first port of the control module, the first port is connected to the control end of the anti-reverse connection circuit of the charger, the second port of the controller for outputting a charging frequency signal is connected to the input end of the power amplifier, and the output end of the power amplifier is connected to the signal output end of the sampling module.

2. The charger according to claim 1, It is characterized in that The sampling module includes a first resistor group and a second resistor group, the first end of the first resistor group is connected to the positive output end of the charger, the second end of the first resistor is the signal output end of the sampling module, the first end of the second resistor group is connected to the signal output end of the sampling module, the second end of the second resistor group is grounded, and the second end of the second resistor group is also connected to the negative output end of the charger.

3. The charger according to claim 2, It is characterized in that The first resistor group includes a resistor R1 and a resistor R1A, wherein a first end of the resistor R1 and a first end of the resistor R1A are connected to the same node as an input end of the first resistor group, and a second end of the resistor R1 and a second end of the resistor R1A are connected to the same node as an output end of the first resistor group.

4. The charger according to claim 2, It is characterized in that The second resistor group includes a resistor R2 and a resistor R2A, wherein the first end of the resistor R2 and the first end of the resistor R2A are connected to the same node as the input end of the second resistor group, and the second end of the resistor R2 and the second end of the resistor R2A are connected to the same node as the output end of the second resistor group.

5. The charger according to claim 1, It is characterized in that The power amplifier includes a transistor QS1, the first port is connected to the base of the transistor QS1, the collector of the transistor QS1 is connected to the signal output end of the sampling module, the emitter of the transistor QS1 is connected to the ground, and the emitter of the transistor QS1 is also connected to the negative output end of the charger.

6. The charger according to claim 5, It is characterized in that The first port is connected to a first end of a resistor R3 , and a second end of the resistor R3 is connected to a base of the transistor QS1 .

7. The charger according to claim 5, It is characterized in that The collector of the transistor QS1 is connected in series with resistors R4 and R5 in sequence, one end of the resistor R5 away from the resistor R4 is connected to the signal output end of the sampling module, one end of the resistor R5 away from the resistor R4 is connected to the capacitor C1, and the second end of the capacitor C1 is connected to the negative output end of the charger.

8. The charger according to claim 1, It is characterized in that The second end of the sampling module is connected to the first end of the resistor R6, and the second end of the resistor R6 is connected to the negative output end of the charger.

Images