TWI748659B - Device and method for LED display control in charging and discharging system - Google Patents

Abstract

Disclosed are a device and method for display control of a light-emitting diode (LED) in a charging and discharging system. The device includes a display code generator configured to generate a charge display code or a discharge display code based on the voltage signal and charge status signal of the battery in the charging and discharging system, the LED display enable signal, and a plurality of preset voltage threshold signals ; And a decoding driver, configured to decode the charging display code or the discharging display code according to the charging state signal to generate a driving signal, the driving signal is used to drive the LED for display.

Description

Device and method for LED display control in charging and discharging system

The present invention generally relates to the field of charging and discharging technology, and more specifically to a device and method for controlling a light-emitting diode (LED) display in a charging and discharging system.

In most charging and discharging systems, LED lights are often used to visually display the working status and battery power of the charging and discharging system.

At present, there are two mainstream LED display control solutions: one is to control the LED display by using battery voltage, battery current, and battery internal resistance information to do accurate calculations to generate its power curve, but this solution is more complicated and consumes a lot of resources; the other is One is to make a rough display based only on the battery voltage. Although this solution consumes less resources, in actual applications, the sensed battery voltage is different under different states and currents, causing many display problems. Common problems include: displaying a decreasing change in the power level in the charging state and displaying an increasing change in the power level in the discharging state. When the charging and discharging states are switched between each other, the light jumps, that is, the number of lights and/or flashing lights changes. "Lighting" refers to the state where the LED light stays on, while "flashing light" refers to the LED light turning on and off.

In view of one or more of the above-mentioned problems, the present invention provides a novel device and method for LED display control in a charging and discharging system.

According to an aspect of the embodiments of the present invention, a device for LED display control in a charging and discharging system is disclosed. The device includes a display code generator configured to be based on a voltage signal and a charging state signal of a battery in the charging and discharging system, LED display enable signal and multiple preset voltage threshold signals to generate charge display code or discharge display code; and a decoding driver configured to perform charging display code or discharge display code according to the charge status signal Decode to generate a driving signal, which is used to drive the LED for display.

According to another aspect of the embodiments of the present invention, a method for LED display control in a charging and discharging system is disclosed. The method includes: based on a voltage signal and a charging state signal of a battery in the charging and discharging system, an LED display enable signal, And a plurality of preset voltage threshold signals to generate a charging display code or a discharging display code; and according to the charging state signal, the charging display code or the discharging display code is decoded to generate a driving signal, and the driving signal is used to drive the LED for display.

100: charge and discharge system

110: Charging control circuit

120: battery

200: LED display control device

210,300: Display code generator

220: Decoding drive

310: Basic clock signal generation module

320,400A: Charging display code generation module

330, 400B: discharge display code generation module

410, 440: first display code bit generation unit

411,421,431,441,451,461,471,481: comparison signal

412,422,432,442,452,462,472,482: delayed signal

420, 450: Second display code bit generation unit

430, 460: third display code bit generation unit

470: Fourth display code bit generation unit

480: Fifth display code bit generating unit

600: method

610,620: steps

COMP: Voltage Sensing Comparator

Charge_ena 202: charge status signal

Charge_code 211, Charge_code 321: charging display code

DBS: Delay component

DCLK 311: basic clock signal

Discharge_code 212, Discharge_code 322: Discharge display code

LATCH: Latch assembly

LED_ena 203, LED_ena 303: LED display enable signal

LED_drive 221: drive signal

I _charge : charging current

I _discharge : discharge current

V _bat ,V _{bat_det} : battery voltage

V _{th1_chg} , V _{th2_chg} , V _{th3_chg} , V _{th1_dischg} , V _{th2_dischg} , V _{th3_dischg} , V _{th4_dischg} , V _{th5_dischg} : voltage threshold

V _{bat_det} 201, V _{bat_det} 301: voltage signal

V _th* 204,V _{th1_chg} 304-1,V _{th2_chg} 304-2,V _{th3_chg} 304-3,V _{th1_dischg} 304-8,V _{th2_dischg} 304-4,V _{th2_dischg} 304-7,V _{th3_dischg} 304-6,V _{th4_dischg} 304 -4,V _{th5_dischg} 304-4: preset voltage threshold signal

The present invention can be better understood from the following description of the specific embodiments of the present invention in conjunction with the drawings. For the simplicity and clarity of the diagram, the elements illustrated in the diagram are not necessarily drawn to scale. For example, the size of some elements may be exaggerated relative to other elements for clarity. In addition, when deemed appropriate, schema marks are repeated between the schemas to indicate corresponding or similar elements. In the scheme:

Figure 1A shows a schematic block diagram of the charging and discharging system in a charging state;

Figure 1B shows a schematic block diagram of the charging and discharging system in a discharging state;

Fig. 2 shows a schematic diagram of a device for LED display control in a charging and discharging system according to an embodiment of the present invention.

Fig. 3 shows a schematic diagram of an example display code generator according to an embodiment of the present invention.

4A shows a block diagram of the internal structure of an exemplary charging display code generation module according to an embodiment of the present invention.

4B shows a block diagram of the internal structure of an exemplary discharge display code generation module according to an embodiment of the present invention.

FIG. 5A shows a schematic diagram of the transition from an exemplary charging display state to a discharging display state according to an embodiment of the present invention.

FIG. 5B shows a schematic diagram of an exemplary transition from a discharging display state to a charging display state according to an embodiment of the present invention.

Figure 6 shows the LED display control used in the charging and discharging system according to an embodiment of the present invention Simplified flow chart of the method.

The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, many specific details are proposed in order to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention. The present invention is by no means limited to any specific configuration and algorithm proposed below, but covers any modification, replacement and improvement of elements, components and algorithms without departing from the spirit of the present invention. In the drawings and the following description, well-known structures and technologies are not shown in order to avoid unnecessary obscurity of the present invention.

It should be pointed out that the "device", "module", "unit", "component", etc. mentioned in the following description can all refer to a circuit or a part of a circuit.

1A and 1B show schematic block diagrams of the charging and discharging system 100 in a charging state and a discharging state, respectively. When the charging and discharging system 100 is connected to a power source for charging, a charging current I _charge is generated in the battery part 120; and when the charging and discharging system 100 is connected to a load to supply power to the load, a discharging current I _discharge is generated in the battery part 120. _{Assuming that the battery voltage V bat} remains unchanged at the moment when the charging and discharging system 100 switches between the charging state and the discharging state, due to _{the transition between the charging current I charge} and the discharging current I _discharge , the charging control circuit 110 will sense The battery voltage V _{bat_det} changes. This change may cause problems such as light jumping when controlling the display of the LED based only on the battery voltage. Taking the case of using four LED lights as an example, the current industry definition of four LED lights is as follows: in charging mode, 1 flash → 1 on and 1 flash → 2 on and 1 flash → 3 on and 1 flash; in discharge mode 4 bright → 3 bright → 2 bright → 1 bright → 1 flash → all off. For example, the problem of light jumping may be reflected in: when switching from the charging mode to the discharging mode, from the charging state of 2 on and 1 flashing to the discharging state 1 on, or when switching from the discharging mode to the charging mode, from the discharging state 2 lights up and jumps to the charging state, 3 lights up and 1 flashes, and so on.

The novel device and method for LED display control in the charging and discharging system provided by the present invention can light up the lights by defining the charging/discharging modes only according to the battery voltage information The time sequence to meet the actual charging and discharging system power display needs, while also avoiding the above-mentioned common problems encountered in the LED display control.

It should be noted that, for the sake of clarity and conciseness, the four LED lights mentioned above are used as an example for description in the following description, but those of ordinary skill in the art should understand that the principles of the present invention can be applied to any suitable The number of LED lights is not limited to the four LED lights described. Therefore, this description is only illustrative and not restrictive.

FIG. 2 shows a schematic diagram of a device 200 for LED display control in a charging and discharging system according to an embodiment of the present invention. For example, the LED display control device 200 may be arranged in the charging control circuit 110 of FIG. 1 to control the display of the LED lights of the charging and discharging system 100.

As shown in the figure, the LED display control device 200 may include a display code generator 210 and a decoding driver 220. _{The display code generator 210 receives the sensed voltage signal V bat_det} 201 of the battery in the charging and discharging system (for example, the battery 120 in the charging and discharging system 100 in FIG. 1), the charging status signal Charge_ena 202, the LED display enable signal LED_ena203, And a plurality of preset voltage threshold signals V _th* 204, and based on the above signals, a charge display code Charge_code 211 or a discharge display code Discharge_code 212 is generated.

Charge_ena 202 indicates whether the battery is charging or discharging. For example, when Charge_ena 212 is at a high level, it indicates that the battery is charging, and when Charge_ena 202 is at a low level, it indicates that it is discharging; or vice versa. Of course, other indication methods are also possible, as long as the corresponding functions can be realized, and they will not be described here. When Charge_ena 202 indicates that the battery is charging, the display code generator 210 generates Charge_code 211, and when Charge_ena 202 indicates that the battery is discharging, the display code generator 210 generates Discharge_code 212.

LED_ena 203 indicates whether the charging and discharging system enables LED display to indicate its working status or battery power. For example, when Charge_ena 202 is at a high level, it indicates that the LED display is enabled; conversely, when Charge_ena 202 is set at a low level, it indicates that the LED display is enabled. Of course, other indication methods are also possible, as long as the corresponding functions can be realized, and they will not be described here.

V _th* 204 indicates a set of preset voltage thresholds, the number of which is related to the number of LED lights used, specifically, the number can be related to the display status of the predefined LED lights during the charging process and the discharge process. The sum of the displayed states is related. For example, in the case of using four LED lights above, there are four display states in the charging mode, namely 1 flash → 1 on and 1 flash → 2 on and 1 flash → 3 on and 1 flash. There are six types in the discharge mode. The display status is 4 on→3 on→2 on→1 on→1 flash→all off, so _{the number of V th*} 204 can be (4-1)+(6-1)=8.

The decoding driver 220 receives the Charge_ena 202 to decode the Charge_code 211 or the Discharge_code 212 received from the display code generator 210 with reference to the signal to generate a driving signal LED_drive 221 for driving the LED lamp for display.

The structure and function of the display code generator 210 will be described in detail below with reference to FIGS. 3 and 4. It should be noted that, for the sake of clarity and conciseness, the four LED lights mentioned above are taken as an example in Figures 3 and 4 and related descriptions. However, those of ordinary skill in the art should understand the principle of the present invention. It can be applied to any suitable number of LED lights, not limited to the four LED lights described.

FIG. 3 shows a schematic diagram of an example display code generator 300 according to an embodiment of the present invention. The example display code generator 300 may be, for example, the display code generator 210 described above in conjunction with FIG. 2.

The display code generator 300 may include, for example, a basic clock signal generation module 310, a charge display code generation module 320, and a discharge display code generation module 330.

As shown in the figure, the basic clock signal generating module 310 receives the LED display enable signal LED_ena 303 to generate the basic clock signal DCLK 311 when the LED_ena 303 indicates that the LED display is enabled. Whenever the charging and discharging system is turned on and the LED display is enabled, the basic clock signal generation module 310 outputs the basic clock signal DCLK 311 at a higher frequency. The basic clock signal DCLK 311 is provided to the delay component DBS described later for digital processing. Delay, so that the initial LED display can quickly sense the battery voltage for display. Subsequently, the basic clock signal generating module 310 switches to output the basic clock signal DCLK 311 at a lower frequency, so that the update of the LED display is not affected by the short-term battery voltage fluctuation that can be sensed.

The charging display code generating module 320 and the discharging display code generating module 330 respectively receive the charging state signal Charge_ena 302. When the Charge_ena 302 indicates that the battery of the charging and discharging system is charging, the charging display code generation module 320 is enabled, and when the Charge_ena 302 indicates that the battery is discharging, the discharge display code generating module 330 is enabled.

When enabled, the charging display code generation module 320 receives the sensed battery voltage signal V _{bat_det} 301, the DCLK 311 generated by the basic clock signal generation module 310, and the preset voltage threshold signal V _{th1_chg} 304-1, V _{th2_chg} 304-2 and V _{th3_chg} 304-3, and generate a charging display code Charge_code 321 based on these signals. It should be noted here that in the case of using four LED lights above, there are four display states in the charging mode, namely 1 flash → 1 on 1 flash → 2 on 1 flash → 3 on 1 flash, therefore, _{In this embodiment, three voltage thresholds V th1_chg} , V _{th2_chg} and V _{th3_chg are} set for the charging mode, but in other embodiments, when a different number of LED lights are used and/or when a different number of display states are defined , Other number of voltage thresholds can be set as needed, and there is no specific limitation here.

When enabled, the discharge display code generation module 330 receives the sensed battery voltage signal Vbat_det 301, the DCLK 311 generated by the basic clock signal generation module 310, and the preset voltage threshold signals V _{th5_dischg} 304-4, V _{th4_dischg} 304-4, V _{th3_dischg} 304-6, V _{th2_dischg} 304-4, and V _{th1_dischg} 304-8, and generate a discharge display code Discharge_code 322 based on these signals. It should be noted here that in the case of using four LED lights above, there are a total of six display states in the discharge mode, namely 4 on → 3 on → 2 on → 1 on → 1 flash → all off, therefore, here _{In the embodiment, five voltage thresholds V th5_dischg} , V _{th4_dischg} , V _{th3_dischg} , V _{th2_dischg} and V _{th1_dischg are} set for the discharge mode, but in other embodiments, when different numbers of LED lamps are used and/or when different numbers are defined In the display state of the, you can set other number of voltage thresholds as needed, and there is no specific limitation here.

The charge display code generation module 320 also receives Discharge_code 322 from the discharge display code generation module 330. Similarly, the discharge display code generation module 330 also receives Charge_code 321 from the charge display code generation module 320, so that the charge display code generation module 320 and the discharge display code generation module 330 can switch to generate a specified display code according to a predefined rule when the charging/discharging state is switched. This will be described in detail below.

The internal structure of the example charging display code generating module 400A and the example discharging display code generating module 400B are shown in detail in FIGS. 4A and 4B. The example charge display code generation module 400A may be the charge display code generation module 320 described above in conjunction with FIG. 3, and the example discharge display code generation module 400B may be the discharge display code generation module 330 described above in conjunction with FIG.

As shown in FIG. 4A, the example charging display code generating module 400A includes a plurality of display code bit generating units in parallel, for example, first to third display code bit generating units 410, 420, and 430. The number of display code bit generating units may be related to the number of predefined LED lights' display states during the charging process. For example, in the case of using four LED lights above, there are four display states in the charging mode, that is, 1 flash → 1 on and 1 flash → 2 on and 1 flash → 3 on and 1 flash. Therefore, in this embodiment Three parallel display code bit generating units 410, 420, and 430 are used. Each display code bit generating unit generates a high level or low level, and the high/low level is converted into a digital code (0, 1), for example, to represent one bit of a binary number. The bits generated by the three orderly arranged display code bit generating units 410, 420, and 430 are arranged in order from the most significant bit to the least significant bit to form a binary code, that is, the charging display code, which will be shown below Discuss.

Each of the first to third display code bit generating units 410, 420, and 430 includes a voltage sensing comparator COMP, a delay component DBS, and a latch component LATCH, respectively.

Each COMP receives the sensed battery voltage signal V _{bat_det} 301 and the corresponding preset voltage threshold signal V _{th1_chg} 304-1, V _{th2_chg} 304-2 and V _{th3_chg} 304-3 respectively. In this embodiment, the preset voltage threshold signals V _{th1_chg} 304-1, V _{th2_chg} 304-2, and V _{th3_chg} 304-3 are set in an increasing order; in other embodiments, it can also be set in other ways that meet the requirements.

The COMP of the first display code bit generating unit 410 compares V _{bat_det} 301 with V _{th1_chg} 304-1 to generate a comparison signal 411, for example, a high level or a low level. For the convenience of description here, the binary number 1 is used to represent the high level, and the binary number 0 is used to represent the low level; in actual use, there may be the opposite situation, and the principle of the present invention is also applicable. The DBS of the first display code bit generating unit 410 receives the basic clock signal DCLK 311 (for example, the DCLK 311 generated by the basic clock signal generating module 310 described above in conjunction with FIG. 3), and delays the comparison signal 411 based on the DCLK 311 to A delayed signal 412 is generated. The LATCH of the first display code bit generating unit 410 locks the delayed signal 412 to ensure the monotonicity of the charging display. The first display code bit generating unit 410 finally outputs a binary number 0 or 1, which represents the most significant bit of the charging display code.

The COMP of the second display code bit generating unit 420 compares V _{bat_det} 301 with V _{th2_chg} 304-2 to generate a comparison signal 421, for example, a high level or a low level. The DBS of the second display code bit generating unit 420 receives the basic clock signal DCLK 311 (for example, the DCLK 311 generated by the basic clock signal generating module 310 described above in conjunction with FIG. 3), and delays the comparison signal 421 based on the DCLK 311 to A delayed signal 422 is generated. The LATCH of the second display code bit generating unit 420 locks the delayed signal 422 to ensure the monotonicity of the charging display. The second display code bit generating unit 420 finally outputs a binary number 0 or 1, which represents the second most significant bit of the charging display code.

The COMP of the third display code bit generating unit 430 compares V _{bat_det} 301 with V _{th3_chg} 304-3 to generate a comparison signal 431, for example, a high level or a low level. The DBS of the third display code bit generating unit 430 receives the basic clock signal DCLK 311 (for example, the DCLK 311 generated by the basic clock signal generating module 310 described above in conjunction with FIG. 3), and delays the comparison signal 431 based on the DCLK 311 to A delayed signal 422 is generated. The LATCH of the third display code bit generating unit 430 locks the delayed signal 432 to ensure the monotonicity of the charging display. The third display code bit generating unit 430 finally outputs a binary number 0 or 1, which represents the least significant bit of the charging display code.

Optionally, the signal output by the preceding display code bit generating unit in the above order can be used to enable the subsequent display code bit generating unit. For example, when the output of the first display code bit generating unit 410 is 1, all subsequent The function of the display code bit generation unit is enabled (that is, the comparison, delay, and lock operations are performed as described above), otherwise, all subsequent display code bit generation units output 0; and so on.

All the binary digits output by the display code bit generation unit follow the above The mentioned sequence is combined into a binary code, that is, the charging display code Charge_code 321, which is output by the charging display code generating module 400A.

In the first to third display code bit generating units 410, 420, and 430, COMP compares the sensed battery voltage (ie, V _{bat_det} 301) with a corresponding threshold to generate a comparison signal, which is the comparison signal for DBS The output signal is updated after a delay. This design ensures that when the sensed battery voltage is disturbed for a short time (usually less than 4 seconds), the result will be filtered out, and the final output signal will not be updated. The comparison signal generated by the signal will be retained and updated to the final output signal; at the same time, the one-way incremental change of the charge display code Charge_code finally output by the charge display code generation module 400A is realized through LATCH, that is, 000→100→110 →111, which corresponds to the display status of the LED light: 1 flash → 1 on and 1 flash → 2 on and 1 flash → 3 on and 1 flash.

As shown in FIG. 4B, the exemplary discharge display code generation module 400B includes a plurality of display code bit generation units in parallel, for example, first to fifth display code bit generation units 440, 450, 460, 470, and 480. The number of display code bit generating units may be related to the number of predefined LED lights' display states during the discharge process. For example, in the case of using four LED lights above, there are a total of six display states in the discharge mode, namely 4 on → 3 on → 2 on → 1 on → 1 flash → all off. Therefore, in this embodiment, Five parallel display code bit generating units 440, 450, 460, 470, and 480. Each display code bit generating unit generates a high level or low level, and the high/low level is converted into a digital code (0, 1), for example, to represent one bit of a binary number. The bits generated by the five orderly arranged display code bit generating units 440, 450, 460, 470, and 480 are arranged in order from the least significant bit to the most significant bit to form a binary code, that is, the discharge display code, This will be discussed below.

Each of the first to fifth display code bit generating units 440, 450, 460, 470, and 480 includes a voltage sensing comparator COMP, a delay component DBS, and a latch component LATCH, respectively.

Each COMP receives the sensed battery voltage signal V _{bat_det} 301 and the corresponding preset voltage threshold signal V _{th5_dischg} 304-4, V _{th4_dischg} 304-5, V _{th3_dischg 304-6} , V _{th2_dischg} 304-7 and V _{th1_dischg} 304 respectively -8. In this embodiment, the preset voltage threshold signals V _{th5_dischg} 304-4, V _{th4_dischg} 304-5, V _{th3_dischg} 304-6, V _{th2_dischg} 304-7, and V _{th1_dischg} 304-8 are set in descending order; in other embodiments It can also be set in other ways that meet the requirements.

The COMP of the first display code bit generating unit 440 compares V _{bat_det} 301 with V _{th5_dischg} 304-4 to generate a comparison signal 441, for example, a high level or a low level. The DBS of the first display code bit generating unit 440 receives the basic clock signal DCLK 311 (for example, the DCLK 311 generated by the basic clock signal generating module 310 described above in conjunction with FIG. 3), and delays the comparison signal 441 based on the DCLK 311 to A delayed signal 442 is generated. The LATCH of the first display code bit generating unit 440 locks the delayed signal 442 to ensure the monotonicity of the discharge display. The first display code bit generating unit 440 finally outputs a binary number 0 or 1, which represents the least significant bit of the discharge display code.

The COMP of the second display code bit generating unit 450 compares V _{bat_det} 301 with V _{th4_dischg} 304-5 to generate a comparison signal 451, for example, a high level or a low level. The DBS of the second display code bit generating unit 450 receives the basic clock signal DCLK 311 (for example, the DCLK 311 generated by the basic clock signal generating module 310 described above in conjunction with FIG. 3), and delays the comparison signal 451 based on the DCLK 311 to A delayed signal 452 is generated. The LATCH of the second display code bit generating unit 450 locks the delayed signal 452 to ensure the monotonicity of the discharge display. The second display code bit generating unit 450 finally outputs a binary number 0 or 1, which represents the second least significant bit of the discharge display code.

The COMP of the third display code bit generating unit 460 compares V _{bat_det} 301 with V _{th3_dischg} 304-6 to generate a comparison signal 461, for example, a high level or a low level. The DBS of the third display code bit generating unit 460 receives the basic clock signal DCLK 311 (for example, the DCLK 311 generated by the basic clock signal generating module 310 described above in conjunction with FIG. 3), and delays the comparison signal 461 based on the DCLK 311 to A delayed signal 462 is generated. The LATCH of the third display code bit generating unit 460 locks the delayed signal 462 to ensure the monotonicity of the discharge display. The third display code bit generating unit 460 finally outputs a binary number 0 or 1, which represents the next valid bit of the discharge display code.

The COMP of the fourth display code bit generating unit 470 compares V _{bat_det} 301 with V _{th2_dischg} 304-7 to generate a comparison signal 471, for example, a high level or a low level. The DBS of the fourth display code bit generating unit 470 receives the basic clock signal DCLK 311 (for example, the DCLK 311 generated by the basic clock signal generating module 310 described above in conjunction with FIG. 3), and delays the comparison signal 471 based on the DCLK 311 to A delayed signal 472 is generated. The LATCH of the fourth display code bit generating unit 470 locks the delayed signal 472 to ensure the monotonicity of the discharge display. The fourth display code bit generating unit 470 finally outputs a binary number 0 or 1, which represents the second most significant bit of the discharge display code.

The COMP of the fifth display code bit generating unit 480 compares V _{bat_det} 301 with V _{th1_dischg} 304-8 to generate a comparison signal 481, for example, a high level or a low level. The DBS of the fourth display code bit generating unit 480 receives the basic clock signal DCLK 311 (for example, the DCLK 311 generated by the basic clock signal generating module 310 described above in conjunction with FIG. 3), and delays the comparison signal 481 based on the DCLK 311 to A delayed signal 482 is generated. The LATCH of the fifth display code bit generating unit 480 locks the delayed signal 482 to ensure the monotonicity of the discharge display. The fifth display code bit generating unit 480 finally outputs a binary number 0 or 1, which represents the most significant bit of the discharge display code.

Optionally, the signal output by the preceding display code bit generating unit in the above order can be used to enable the subsequent display code bit generating unit. For example, when the output of the first display code bit generating unit 440 is 0, all subsequent The functions of the display code bit generating units (ie, the second to fifth display code bit generating units) are enabled (ie, the comparison, delay, and locking operations are performed as described above), otherwise, all subsequent display code bit generating units output 1; When the output of the second display code bit generating unit 450 is also 0, the functions of all subsequent display code bit generating units (ie, the third to fifth display code bit generating units) are enabled, otherwise, all subsequent display code bit generating units The bit generation unit outputs 1; and so on.

All the binary numbers output by the display code bit generating unit are combined into a binary code in the order mentioned above, that is, the discharge display code Discharge_code 322, for the discharge display code generation module 400B to output.

In the first to fifth display code bit generating units 440, 450, 460, 470, and 480, COMP compares the sensed battery voltage (ie, V _{bat_det} 301) with the corresponding threshold to generate a comparison signal, DBS The comparison signal is delayed and then updated to the output signal. This design ensures that when the sensed battery voltage is disturbed for a short time (usually less than 4 seconds), the result will be filtered out and not updated to the final output The comparison signal generated by the real signal will be retained and updated to the final output signal; at the same time, the unidirectional decreasing change of the discharge display code Discharge_code finally output by the discharge display code generation module 400B is realized through LATCH, which is 11111 → 11110 → 11100 → 11000 → 10000 → 00000, which corresponds to the display status of the LED light 4 bright → 3 bright → 2 bright → 1 bright → 1 flash → all off.

Returning to what was mentioned above in conjunction with FIG. 3, the charge display code generation module 320 also receives Discharge_code 322 from the discharge display code generation module 330, and similarly, the discharge display code generation module 330 also receives Charge_code from the charge display code generation module 320 321, so that the charging display code generating module 320 and the discharging display code generating module 330 can switch to generate a specified display code according to a predefined rule when the charging/discharging state switching occurs, which is reflected in FIGS. 4A and 4B for:

(1) When the battery of the charging and discharging system is switched from the discharging state to the charging state, the LATCH of each of the first to third display code bit generating units 410, 420, and 430 of the charging display code generating module 400A also receives The Discharge_code 322 generated by the discharge display code generation module 400B is used to output a specified signal according to the Discharge_code 322 according to a predefined rule, for example, a specified level or a binary number;

(2) When the battery of the charging and discharging system is switched from the charging state to the discharging state, the discharge displays the LATCH of each of the display code bit generating units 440, 450, 460, 470, and 480 in the code generating module 400B The Charge_code 321 generated by the charging display code generation module 400A is also received to output a specified signal according to the Charge_code 321 according to a predefined rule, for example, a specified level or a binary number.

The "predefined rules" mentioned will be described in detail below.

Table 1 describes an example of the charge display code Charge_code and the discharge display code Discharge_code when four LED lights are used.

4A, in the charging mode, when the sensed battery voltage is less than V _{th1_chg} 304-1, the first to third display code bit generating units 410, 420, and 430 all output 0, that is, the Charge_code is 000. One of the four LED lights flashes; as the battery power increases, when the sensed battery voltage is greater than V _{th1_chg} 304-1 but less than V _{th2_chg} 304-2, the first display code bit generating unit 410 outputs 1 , And the second and third display code bit generating units 420 and 430 output 0, and the Charge_code is 100. One of the four LED lights is lit and the other one is blinking; as the battery power continues to increase, when it is sensed When the electrical ground voltage is greater than V _{th2_chg} 304-2 but less than V _{th3_chg} 304-3, the first display code bit generating unit 410 outputs 1, the second display code bit generating unit 420 also outputs 1, and the third display code bit generating unit 430 outputs 0, Charge_code is 110, two of the 4 LED lights are on and the other one is blinking; as the battery power continues to increase, when the sensed battery voltage is greater than V _{th3_chg} 304-3, the first The display code bit generation unit 410 outputs 1, the second display code bit generation unit 420 also outputs 1, and the third display code bit generation unit 430 also outputs 1, and the Charge_code is 111. Three of the four LED lights are lit and one is lit. The LED light flashes.

4B, in the discharge mode, when the sensed battery voltage is greater than V _{th5_dischg} 304-4, the first to fifth display code bit generating units 440, 450, 460, 470, and 480 all output 1, that is Discharge_code is 11111, all 4 LED lights are on; as the battery discharges, the sensed voltage decreases. When the sensed battery voltage is greater than V _{th4_dischg} 304-5 but less than V _{th5_dischg} 304-4, the first display The code bit generating unit 440 outputs 0, and the second to fifth display code bit generating units 450, 460, 470, and 480 all output 1, that is, the Discharge_code is 11110, and three of the four LED lights are on, and one LED light Off; as the battery discharges, the sensed voltage is further reduced. When the sensed battery voltage is greater than V _{th3_dischg} 304-6 but less than V _{th4_dischg} 304-5, the first and second display code bit generating units 440 and 450 outputs 0, and the third to fifth display code bit generating units 460, 470, and 480 all output 1, that is, the Discharge_code is 11100. Two of the four LED lights are on and two LED lights are off; with the battery The discharge causes the sensed voltage to be further reduced. When the sensed battery voltage is greater than V _{th2_dischg} 304-7 but less than V _{th3_dischg} 304-6, the first to third display code bit generating units 440, 450, and 460 output 0 , And the fourth and fifth display code bit generating units 470 and 480 both output 1, that is, the Discharge_code is 11000. One of the four LED lights is on and three LED lights are off; as the battery discharges, the sensed The voltage is further reduced. When the sensed battery voltage is greater than V _{th1_dischg} 304-8 but less than V _{th2_dischg} 304-7, the first to fourth display code bit generating units 440, 450, 460, and 470 output 0, and the fifth The display code bit generation unit 480 outputs 1, that is, the Discharge_code is 10000. One of the 4 LED lights flashes and the others are off; as the battery discharges, the sensed voltage is further reduced. When the sensed battery voltage is less than When V _{th1_dischg} 304-8, the first to fifth display code bit generating units 440, 450, 460, 470, and 480 all output 0, that is, the Discharge_code is 00000, and all 4 LED lights are turned off.

It should be pointed out that the number of LED lights mentioned above, the display status during charging and discharging, and the corresponding display code are just examples. In other embodiments, different numbers of LED lights can be set according to actual needs. The different display states during the discharge process and the different display codes are not specifically limited here.

FIG. 5A shows an example charging display state according to an embodiment of the present invention to Schematic diagram of discharge display state transition. Similarly, taking the case of using four LED lights mentioned above as an example, when charging, the possible display states of the LED lights are as follows: 1 flash → 1 on and 1 flash → 2 on and 1 flash → B on and 1 flash, corresponding to Charging display code 000→100→110→111; when discharging, the possible display states of the LED light are as follows: 4 on→3 on→2 on→1 on→1 flash→all off, corresponding to the discharge display code 11111→11110→11100 →11000→10000→00000. Referring to Figure 5A, when the charging and discharging system is switched from charging mode to discharging mode: when the LED light is in the charging display state 1 flash (000), it is correspondingly converted to the discharge display state 1 flash (10000); when the LED light is in When the charging display state 1 is on and 1 flash (100), it will correspondingly switch to the discharge display state 1 is on (11000); when the LED light is in the charging display state 2 is on and 1 flash (110), it is correspondingly switched to the discharge display state 2 is on (11100); When the LED light is in the charge display state 3 on and 1 flash (111), it will correspondingly switch to the discharge display state 3 on (11110). The following table 2 shows the code conversion relationship from the charging display state to the discharging display state.

In conjunction with the description of FIGS. 4A and 4B above, when the battery of the charging and discharging system is switched from the charging state to the discharging state, each display code bit generating unit 440, 450, 460, 470 in the discharge display code generating module 400B The LATCH of each of and 480 also receives the Charge_code 321 generated by the charging display code generation module 400A to output a specified signal according to the Charge_code 321 according to a predefined rule, for example, a specified level or a binary number. When the battery of the charging and discharging system transitions from the charging state to the discharging state, for example, if the Charge_code 321 generated by the charging display code generation module 400A is "000", then each display code bit generation unit in the discharge display code generation module 400B The LATCH of each of 440, 450, 460, 470, and 480 received the code "000", and according to Table 2 The predefined rules shown are locked to the corresponding binary numbers, for example, "0", "0", "0", "0", "1", so that the discharge display code generation module 400B outputs the discharge display code "10000" "; For example, if the Charge_code 321 generated by the charging display code generation module 400A is "111", each of the display code bit generation units 440, 450, 460, 470, and 480 in the discharge display code generation module 400B The user’s LATCH receives the code "111" and locks it to the corresponding binary number according to the predefined rules shown in Table 2, for example, "0", "1", "1", "1", "1" , So that the discharge display code generation module 400B outputs the discharge display code "11110"; other situations are similar and will not be described here.

After the battery of the charging and discharging system completes the conversion from the charging display state to the discharging display state, the display code bit generating units 440, 450, 460, 470, and 480 of the discharge display code generating module 400B work normally according to their respective modes to update Discharge display code. In this way, after the completion of the display state conversion, there will be no light jumping.

FIG. 5B shows a schematic diagram of an exemplary transition from a discharging display state to a charging display state according to an embodiment of the present invention. Similarly, taking the case of using four LED lights mentioned above as an example, when discharging, the possible display states of the LED lights are as follows: 4 on → 3 on → 2 on → 1 on → 1 flash → all off; when charging , The possible display states of the LED light are as follows: 1 flash→1 on and 1 flash→2 on and 1 flash→3 on and 1 flash, corresponding to the charging display code 000→100→110→111. Referring to Figure 5B, when the charging and discharging system is switched from the discharging mode to the charging mode: when the LED light is in the discharge display state, all off (00000) or 1 flash (10000), correspondingly switch to the charging display state 1 flash (000) ; When the LED lamp is in the discharge display state 1 on (11000), it will correspondingly switch to the charging display state 1 on and 1 flash (100); when the LED lamp is in the discharge display state 2 on (11100), it will correspondingly switch to the charging display State 2 is on and 1 flash (110); when the LED is in the discharge display state 3 on (11110) or 4 on (11111), it will correspondingly switch to charging display state 3 on and 1 flash (111). The following table 3 shows the code conversion relationship from the discharge display state to the charge display state.

In conjunction with the description of FIGS. 4A and 4B above, when the battery of the charging and discharging system is switched from the discharging state to the charging state, the first to third display code bit generating units 410, 420, and 430 of the charging display code generating module 400A The LATCH of each of them also receives the Discharge_code 322 generated by the discharge display code generation module 400B to output a specified signal according to the Discharge_code 322 according to a predefined rule, for example, a specified level or a binary number. When the battery of the charging and discharging system transitions from the discharging state to the charging state, for example, the Discharge_code 322 "00000" or "10000" generated by the discharging display code generating module 400B, then the first to the third of the charging display code generating module 400A The LATCH showing each of the code bit generating units 410, 420, and 430 receives the code "00000" or "10000", and locks to the corresponding binary number according to the predefined rules shown in Table 3, for example, " 0", "0", "0", so that the charging display code generating module 400A outputs the charging display code "000"; for example, the Discharge_code 322 "11110" or "11111" generated by the discharging display code generating module 400B is charged The LATCH of each of the first to third display code bit generating units 410, 420, and 430 of the display code generating module 400A receives the code "11110" or "11111", and according to the predefined The rules are locked to the corresponding binary numbers, such as "1", "1", and "1", so that the charging display code generation module 400A outputs the charging display code "111"; other situations are similar, and will not be described here.

After the battery of the charging and discharging system completes the conversion from the discharging display state to the charging display state, the display code bit generating units 410, 420, and 430 of the charging display code generating module 400A work normally according to their respective modes to update the charging display code. In this way, after the completion of the display state conversion, there will be no light jumping.

It should be pointed out that the pre-defined rules for the mutual conversion of charging/discharging LED display states shown above are only used to illustrate the basic principles of the present invention and not to limit the scope of the present invention. In other embodiments, it can be based on actual conditions. Need to define different conversion rules, There is no specific limitation here.

Hereinafter, an exemplary method 600 for LED display control in a charging and discharging system according to an embodiment of the present invention will be described with reference to FIG. 6.

The method 600 includes, in step 610, based on the voltage signal (V _{bat_det} ) and the charge state signal (Charge_ena) of the battery in the charging and discharging system, the LED display enable signal (Charge_ena), and a plurality of preset voltage threshold signals (V _{th *} ) To generate charge display code (Charge_code) or discharge display code (Discharge_code). This step can be implemented by, for example, the display code generator 210 shown in FIG. 2.

The method 600 further includes, in step 620, decoding the charge display code (Charge_code) or the discharge display code (Discharge_code) according to the charge status signal (Charge_ena) to generate a drive signal (LED_drive), and the drive signal (LED_drive) is used for driving The LED lights of the charging and discharging system display. This step can be implemented by, for example, the decoding driver 220 shown in FIG. 2.

The device and method for LED display control in the charging and discharging system provided by the embodiments of the present invention can realize that the charging and discharging system monotonically lights up the lights in the charging mode and turns off the lights monotonously in the discharging mode, and the charging mode and the discharging mode interact with each other. No light bounce occurs during conversion. In addition, the device and method for LED display control in the charging and discharging system provided by the embodiments of the present invention can also enable the charging and discharging system to quickly capture the battery voltage for LED display when the charging and discharging system is turned on, and it is not affected when the display is updated. The impact of short-term battery voltage fluctuations that can be sensed.

The present invention can be implemented in other specific forms without departing from its spirit and essential characteristics. For example, the algorithm described in the specific embodiment can be modified, and the system architecture does not deviate from the basic spirit of the present invention. Therefore, the current embodiments are regarded as illustrative rather than restrictive in all aspects, and the scope of the present invention is defined by the scope of the appended patent application rather than the above description, and falls within the meaning and equivalent of the scope of the patent application. All changes within the scope of things are thus included in the scope of the present invention.

200: LED display control device

210: Display code generator

220: Decoding drive

Charge_ena 202: charge status signal

Charge_code 211: Charging display code

Discharge_code 212: Discharge display code

LED_ena 203: LED display enable signal

LED_drive 221: drive signal

V _{bat_det} 201: Voltage signal

V _th* 204: preset voltage threshold signal

Claims (20)

A device for LED display control in a charging and discharging system includes: a display code generator configured to be based on a voltage signal and a charging state signal of a battery in the charging and discharging system, an LED display enable signal, and a plurality of A preset voltage threshold signal to generate a charging display code or a discharging display code; and a decoding driver configured to decode the charging display code or the discharging display code according to the charging state signal to generate a driving signal, the driving The signal is used to drive the LED for display. The device according to claim 1, wherein the display code generator includes: a basic clock signal generation module for generating a basic clock signal based on the LED display enable signal; and a charging display code generation module for Generate the charging display code based on the basic clock signal, the voltage signal, and the preset voltage threshold signal; and a discharge display code generating module for generating based on the basic clock signal, the voltage signal, and The predetermined voltage threshold signal generates the discharge display code; wherein, whether the charge display code generation module or the discharge display code generation module is activated depends on the charge state signal. The device according to claim 1 or 2, wherein the charge display code is a binary code composed of a first number of bits, and the discharge display code is a binary code composed of a second number of bits. The device according to claim 3, wherein the first number and the second number are respectively related to the number of the LEDs. The device according to claim 3, wherein the first number is related to the total number of states to be displayed by the LED during charging, and the second number is related to the state to be displayed by the LED during discharging The total number is related. The device according to claim 2, wherein the charging display code generation module includes a first number of display code bit generating units, each of which is used to generate one of the charging display code Bit; and the discharge display code generation module includes a second number of display code bit generation units, each of which is used to generate one bit of the discharge display code. The device according to claim 6, wherein each of the display code bit generating units includes a voltage sensing comparator, a delay component, and a latch component: the voltage sensing comparator is used to compare the voltage signal with the corresponding Compares a preset voltage threshold signal to generate a comparison signal; the delay component is used to delay the comparison signal based on the basic clock signal to generate a delayed signal; and the latch component is used to The delay signal is used to lock. The device according to claim 7, wherein, when the charging and discharging system is switched from the discharging mode to the charging mode, the plug in each of the display code bit generating units in the charging display code generating module The lock component also receives the discharge display code from the discharge display code generation module to output a designated signal according to the discharge display code according to a predefined rule. The device according to claim 7, wherein, when the charging and discharging system is switched from the charging mode to the discharging mode, the plug in each of the display code bit generating units in the discharge display code generating module The lock component also receives the charging display code from the charging display code generating module to output a designated signal according to the charging display code according to a predefined rule. The device according to claim 7, wherein the preset voltage threshold corresponding to each of the first number of display code bit generating units will be the most significant bit of the charging display code according to the bit to be generated The order of the least significant bit is increasing, and the preset voltage threshold corresponding to each of the second number of display code bit generating units will be the least significant bit of the discharge display code to the highest according to the bit to be generated. The order of valid bits decreases. The device according to claim 10, wherein, in the charging display code generation module, when the bits to be generated will be the most significant bit to the least significant bit of the charging display code, the first When the output of the display code bit generating unit is 1, the functions of all subsequent display code bit generating units are enabled; otherwise, all subsequent display code bit generating units output 0. The device according to claim 10, wherein, in the discharge display code generation module, when the bit to be generated will be the least significant bit of the discharge display code to the most significant bit, the order of the first display When the output of the code bit generating unit is 0, the functions of all subsequent display code bit generating units are enabled; otherwise, all subsequent display code bit generating units output 1. A method for LED display control in a charging and discharging system includes: generating based on a voltage signal and a charging state signal of a battery in the charging and discharging system, an LED display enable signal, and a plurality of preset voltage threshold signals Charging display code or discharging display code; and decoding the charging display code or discharging display code according to the charging state signal to generate a driving signal, and the driving signal is used to drive the LED for display. The method according to claim 13, wherein generating the charging display code or the discharging display code includes: when the charging state signal indicates that the charging and discharging system is in a charging mode, based on a basic clock signal, the voltage Signal and the preset voltage threshold signal to generate the charging display code; or when the charging status signal indicates that the charging and discharging system is in the discharging mode, based on the basic clock signal, the voltage signal, and the A preset voltage threshold signal generates the discharge display code; wherein, the basic clock signal is generated based on the LED display enable signal. The method according to claim 13 or 14, wherein the charge display code is a binary code composed of a first number of bits, and the discharge display code is a binary code composed of a second number of bits. The method according to claim 15, wherein the first number is related to the total number of states to be displayed by the LED during charging, and the second number is related to the state to be displayed by the LED during discharging The total number is related. The method according to claim 15, wherein, when the charging state signal indicates the charging When the discharging system is in the charging mode, generating the charging display code based on the basic clock signal, the voltage signal, and the preset voltage threshold signal includes the following steps: from the most significant bit to the least significant bit To generate each bit of the charging display code in sequence: compare the voltage signal with a corresponding preset voltage threshold signal to generate a comparison signal; delay processing the comparison signal based on the basic clock signal to A delayed signal is generated; and the delayed signal is locked as the bit; wherein the corresponding preset voltage threshold increases in the order from the most significant bit to the least significant bit. The method according to claim 15, wherein when the charging state signal indicates that the charging and discharging system is in the discharging mode, based on the basic clock signal, the voltage signal, and the preset voltage threshold signal Generating the discharge display code includes: generating each bit of the discharge display code in sequence from the least significant bit to the most significant bit through the following steps: comparing the voltage signal with a corresponding preset voltage threshold signal To generate a comparison signal; delay processing the comparison signal based on the basic clock signal to generate a delayed signal; and lock the delayed signal as the bit; wherein, the corresponding preset voltage threshold Decrease in the order from the least significant bit to the most significant bit. The method according to claim 15, wherein when the charging state signal indicates that the charging and discharging system is switched from the discharging mode to the charging mode, outputting a specified charging display code according to the discharging display code according to a predefined rule. The method according to claim 15, wherein, when the charging state signal indicates the charging When the discharging system switches from the charging mode to the discharging mode, it outputs a specified discharge display code according to the charging display code according to a predefined rule.

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