Charger without reference debugging

Abstract

The utility model discloses a charger without reference debugging, which relates to the technical field of electric vehicles, and is characterized in that the input end of a high-frequency transformer is connected with the power supply end of the charger, and the output end of the high-frequency transformer is connected with the output end of the charger; the sampling end of the sampling module is connected with a circuit between the output end of the high-frequency transformer and the output end of the charger, the sampling signal output end of the sampling module is connected with the reference module, and reference values are stored in the reference module; the output end of the reference module is connected with the PWM control module, and the output end of the PWM control module is connected with the high-frequency transformer. Therefore, the input end of the reference module can output the adjusting signal to the PWM control module according to comparison of the sampling signal sent by the sampling module and the reference value correspondingly stored by the reference module, the PWM control module adjusts the transformation ratio of the high-frequency transformer according to the adjusting signal, and the problem that the reference is unstable due to the fact that an auxiliary power source and the like are arranged to provide the reference value is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, in particular to a charger without reference debugging. Background Art

[0002] At present, the chargers of various manufacturers on the market complete the charging mode according to four major parameters, namely, the maximum output voltage, floating charge voltage, constant current value, and lamp current. Then the accuracy of these four parameters depends entirely on the pre-set reference values.

[0003] However, the reference values ​​used in the market are basically derived from the high-precision voltage-stabilized power supply made of the programmable diode TL431. In addition to the accuracy deviation and discreteness of this component itself, it is also disturbed by various reasons such as temperature drift and interference, causing this reference to often have positive or negative bias due to different batches. As a result, firstly, it makes the parameter debugging in the production process cumbersome and labor-intensive; secondly, there will be some fluctuations after leaving the factory, which will affect the parameters. Utility Model Content

[0004] Based on the above problems, the utility model provides a charger without reference debugging to reduce the tediousness of debugging parameters and the fluctuation of parameters after leaving the factory.

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

[0006] In a first aspect, the present application provides a charger without reference debugging, including: a high-frequency transformer, a sampling module, a reference module and a PWM control module;

[0007] The input end of the high-frequency transformer is connected to the power supply end of the charger, and the output end of the high-frequency transformer is connected to the output end of the charger through a high-frequency output rectifier module;

[0008] The sampling end of the sampling module is connected to the circuit between the output end of the high-frequency transformer and the output end of the charger, the sampling signal output end of the sampling module is connected to the reference module, and the reference module stores a reference value;

[0009] The output end of the reference module is connected to the PWM control module, and the output end of the PWM control module is connected to the input end of the high-frequency transformer.

[0010] Optionally, a photoelectric coupling feedback network is further provided between the output end of the reference module and the PWM control module.

[0011] Optionally, a matching network is also included, wherein the output end of the reference module is connected to the input end of the photoelectric coupling feedback network, the output end of the photoelectric coupling feedback network is connected to the input end of the matching network, and the output end of the matching network is connected to the input end of the PWM control module.

[0012] Optionally, the sampling module includes a current sampling module and a voltage sampling module; the first output end of the high-frequency transformer is connected to the positive output end of the charger through a first branch, and the second output end of the high-frequency transformer is connected to the negative output end of the charger through a second branch; the voltage sampling module is connected to the first branch to collect the voltage value of the first branch, and the current sampling module is connected to the second branch to collect the current value of the second branch.

[0013] Optionally, the first branch includes the high-frequency output rectifier module and the high-frequency output filter module which are connected in series with the first output end of the high-frequency transformer in sequence, the output end of the high-frequency output filter module is connected to the positive output end of the charger, and the collection end of the voltage sampling module is connected to the output end of the high-frequency output filter module.

[0014] Optionally, the second branch includes a current sampling module and an anti-reverse connection module which are sequentially connected in series with the second output end of the high-frequency transformer, and a sampling signal output end of the current sampling module is connected to the reference module.

[0015] Optionally, the PWM control module includes a PWM chip, a switch MOS tube and an absorption circuit, the output end of the PWM chip is connected to the switch MOS tube, the output end of the switch MOS tube is connected to the input end of the absorption circuit, and the output end of the absorption circuit is connected to the input end of the high-frequency transformer.

[0016] Optionally, the power supply end is alternating current, and the alternating current outputs direct current to the input end of the high-frequency transformer through a silicon diode rectifier.

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

[0018] The utility model connects the input end of the high-frequency transformer to the power supply end of the charger, and the output end of the high-frequency transformer to the output end of the charger; the sampling end of the sampling module is connected to the circuit between the output end of the high-frequency transformer and the output end of the charger, and the sampling signal output end of the sampling module is connected to the reference module, and the reference module stores a reference value; the output end of the reference module is connected to the PWM control module, and the output end of the PWM control module is connected to the high-frequency transformer. In this way, the input end of the reference module compares the sampling signal sent by the sampling module with the reference value stored in the reference module, and outputs an adjustment signal to the PWM control module. The PWM control module adjusts the transformation ratio of the high-frequency transformer according to the adjustment signal, reduces the problem of unstable reference fluctuation caused by providing a reference value by setting an auxiliary power supply, and avoids the cumbersomeness of later debugging. 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 structural schematic diagram of a charger without reference debugging;

[0021] Figure 2 The utility model provides a structural schematic diagram of another charger without benchmark debugging;

[0022] Figure 3 The utility model provides a connection structure schematic diagram of a photoelectric coupler. 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 1The structural schematic diagram of a charger without reference debugging is shown. The present application provides a charger without reference debugging, including a high-frequency transformer, a sampling module, a reference module and a PWM control module; the input end of the high-frequency transformer is connected to the power supply end of the charger, and the output end of the high-frequency transformer is connected to the output end of the charger through a high-frequency output rectifier module.

[0025] The voltage at the charger output is stepped down and regulated by a high-frequency transformer.

[0026] The sampling end of the sampling module is connected to the circuit between the output end of the high-frequency transformer and the output end of the charger, and the sampling signal output end of the sampling module is connected to the reference module, and the reference module stores a reference value; the reference value stored in the reference module can be the reference value of TL431 components of various precisions, and the average statistical value is weighted to determine a reference value (for example, a reference value of a 5V voltage), and then multiple reference values ​​(for example, reference values ​​of multiple voltages) are encoded and associated with corresponding reference parameter values ​​to create a table, and stored in the reference module. When a customer needs a certain reference parameter value, the closest code is called out by looking up the table and restored to the reference value at the time of encoding, so that an accurate reference value can be obtained without configuring an auxiliary power supply to provide a reference value, thereby improving the accuracy of the reference.

[0027] The output end of the reference module is connected to the PWM control module, and the output end of the PWM control module is connected to the input end of the high-frequency transformer.

[0028] According to the above-mentioned charger without benchmark debugging, the input end of the benchmark module compares the sampling signal sent by the sampling module with the benchmark value stored in the benchmark module, and outputs an adjustment signal to the PWM control module. The PWM control module adjusts the transformation ratio of the high-frequency transformer according to the adjustment signal, thereby reducing the problem of unstable benchmark fluctuations caused by providing a benchmark value by setting an auxiliary power supply, and avoiding the tediousness of later debugging.

[0029] Optionally, a photoelectric coupling feedback network is further provided between the output end of the reference module and the PWM control module.

[0030] The photoelectric coupling feedback network adopts a photoelectric coupler.

[0031] Optionally, the charger may further include a matching network. Figure 2 A schematic diagram of the structure of another charger without benchmark debugging is shown.

[0032] In a possible implementation, a matching network may be provided between the photoelectric coupling feedback network and the PWM control module. Specifically, the output end of the reference module is connected to the input end of the photoelectric coupling feedback network, the output end of the photoelectric coupling feedback network is connected to the input end of the matching network, and the output end of the matching network is connected to the input end of the PWM control module.

[0033] For example, see Figure 3 , optocoupler feedback network (such as Figure 3 The matching network between the photocoupler IC1 and the PWM control module shown in the figure may include a resistor R3 and a capacitor C1, wherein the first end of the capacitor C1 is connected to the input end of the photoreceiver of the photocoupler IC1, the output end of the photoreceiver is connected to the second end of the capacitor C1, and the second end of the capacitor C1 is also grounded. The resistor R3 is connected between the input end of the photoreceiver and the first end of the capacitor C1, and the first end of the capacitor C1 is also connected to the signal input end of the PWM control module.

[0034] In one possible implementation, the reference module is coupled to an optocoupler feedback network (eg Figure 3 A matching network may also be provided between the optocoupler IC1 shown in FIG. Figure 3 The matching network between the reference module and the photoelectric coupling feedback network may include a resistor R1 and a resistor R2, wherein the output end of the reference module is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the first end of the light emitter of the photoelectric coupler IC1, the light emitter input end of the photoelectric coupler IC1 is also connected to the first end of the resistor R2, the second end of the resistor R2 is connected to the output end of the light emitter of the photoelectric coupler IC1, and the output end of the light emitter of the photoelectric coupler IC1 is also grounded.

[0035] The current state can be regulated and the circuit protected through the optocoupler feedback network. In addition, a matching network can be configured for impedance matching to improve the stability of the circuit operation.

[0036] Optionally, the sampling module includes a current sampling module and a voltage sampling module; the first output end of the high-frequency transformer is connected to the positive output end of the charger through a first branch, and the second output end of the high-frequency transformer is connected to the negative output end of the charger through a second branch; the voltage sampling module is connected to the first branch to collect the voltage value of the first branch, and the current sampling module is connected to the second branch to collect the current value of the second branch.

[0037] Exemplarily, the first branch includes a high-frequency output rectifier module and a high-frequency output filter module which are connected in series with the first output end of the high-frequency transformer in sequence, the output end of the high-frequency output filter module is connected to the positive output end of the charger, and the collection end of the voltage sampling module is connected to the output end of the high-frequency output filter module.

[0038] Specifically, a voltage value is collected from the positive output terminal of the charger, and the currently collected voltage value is compared with the reference voltage value during charging in the reference module. According to the difference between the currently collected voltage value and the reference voltage value, an adjustment signal is generated to the output terminal of the PWM control module. The PWM control module feedback adjusts the transformation ratio of the high-frequency transformer to stabilize the voltage value output from the positive output terminal at the reference voltage value, thereby avoiding charging voltage fluctuations and achieving constant voltage charging.

[0039] Exemplarily, the second branch includes a current sampling module and an anti-reverse connection module which are sequentially connected in series with the second output end of the high-frequency transformer, and a sampling signal output end of the current sampling module is connected to the reference module.

[0040] Specifically, the current value is collected from the second branch series current sampling module, and the current value collected is compared with the reference current value during charging in the reference module. According to the difference between the current value collected and the reference current value, an adjustment signal is generated to the output end of the PWM control module. The PWM control module feedback adjusts the high-frequency transformer to stabilize the current value of the second branch at the reference current value, reduce current fluctuations, and achieve constant current charging.

[0041] In a possible implementation, the PWM control module includes a PWM chip, a switch MOS tube and an absorption circuit, the output end of the PWM chip is connected to the switch MOS tube, the output end of the switch MOS tube is connected to the input end of the absorption circuit, and the output end of the absorption circuit is connected to the input end of the high-frequency transformer. Further, the power supply end is alternating current, and the alternating current outputs direct current to the input end of the high-frequency transformer through a silicon diode rectifier.

[0042] Exemplarily, the AC power source may be mains electricity or the like.

[0043] Specifically, the PWM chip controls the duty cycle of the switching MOS tube, and the switching MOS tube and the absorption circuit control the output and cutoff of the DC power, thereby forming a rectangular wave for transmitting to the high-frequency transformer. The high-frequency rectangular wave is transmitted to the high-frequency transformer by turning on and off the high-frequency of the switching MOS tube, thereby improving the efficiency of the frequency transformer and reducing the size of the charger. The high-frequency transformer provides the required DC power to the charger through the high-frequency output rectifier module and the high-frequency output filter module of the first branch.

[0044] 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.

[0045] 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 charger without benchmark debugging, characterized in that: include: High frequency transformer, sampling module, reference module and PWM control module; The input end of the high-frequency transformer is connected to the power supply end of the charger, and the output end of the high-frequency transformer is connected to the output end of the charger through a high-frequency output rectifier module; The sampling end of the sampling module is connected to the circuit between the output end of the high-frequency transformer and the output end of the charger, the sampling signal output end of the sampling module is connected to the reference module, and the reference module stores a reference value; The output end of the reference module is connected to the PWM control module, and the output end of the PWM control module is connected to the input end of the high-frequency transformer.

2. The charger according to claim 1, characterized in that: A photoelectric coupling feedback network is also provided between the output end of the reference module and the PWM control module.

3. The charger according to claim 2, characterized in that: It also includes a matching network, wherein the output end of the reference module is connected to the input end of the photoelectric coupling feedback network, the output end of the photoelectric coupling feedback network is connected to the input end of the matching network, and the output end of the matching network is connected to the input end of the PWM control module.

4. The charger according to claim 1, characterized in that: The sampling module includes a current sampling module and a voltage sampling module; The first output end of the high-frequency transformer is connected to the positive output end of the charger through the first branch, and the second output end of the high-frequency transformer is connected to the negative output end of the charger through the second branch; The voltage sampling module is connected to the first branch to collect the voltage value of the first branch, and the current sampling module is connected to the second branch to collect the current value of the second branch.

5. The charger according to claim 4, characterized in that: The first branch includes the high-frequency output rectifier module and the high-frequency output filter module which are connected in series with the first output end of the high-frequency transformer in sequence, the output end of the high-frequency output filter module is connected to the positive output end of the charger, and the collection end of the voltage sampling module is connected to the output end of the high-frequency output filter module.

6. The charger according to claim 4, characterized in that: The second branch includes a current sampling module and an anti-reverse connection module which are sequentially connected in series with the second output end of the high-frequency transformer, and a sampling signal output end of the current sampling module is connected to the reference module.

7. The charger according to claim 1, characterized in that: The PWM control module includes a PWM chip, a switch MOS tube and an absorption circuit. The output end of the PWM chip is connected to the switch MOS tube, the output end of the switch MOS tube is connected to the input end of the absorption circuit, and the output end of the absorption circuit is connected to the input end of the high-frequency transformer.

8. The charger according to claim 7, characterized in that: The power supply end is alternating current, and the alternating current outputs direct current to the input end of the high-frequency transformer through a silicon diode rectifier.

Images