CN110957795B - Charging circuit, charging device and display screen - Google Patents
Charging circuit, charging device and display screen Download PDFInfo
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- CN110957795B CN110957795B CN201911233007.7A CN201911233007A CN110957795B CN 110957795 B CN110957795 B CN 110957795B CN 201911233007 A CN201911233007 A CN 201911233007A CN 110957795 B CN110957795 B CN 110957795B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
Abstract
The invention relates to a charging circuit which comprises a resonance circuit, a rectifying and filtering circuit and a constant power control module, wherein the input end of the resonance circuit is used for being connected with an external power supply, the output end of the resonance circuit is connected with the input end of the rectifying and filtering circuit, the output end of the rectifying and filtering circuit is connected with the input end of the constant power control module, the output end of the constant power control module is used for being connected with an energy storage capacitor, and the output end of the constant power control module is also used for adjusting charging power parameters according to the voltage of the energy storage capacitor so that the constant power control module outputs constant power for the energy storage capacitor. The electric signal of external power source input obtains required direct current signal after resonance circuit and rectification filter circuit, later charges for energy storage capacitor through the constant power control module with direct current signal, and the constant power control module will be inputed to energy storage capacitor's power and adjust for output stable charging power.
Description
Technical Field
The invention relates to the technical field of display screens, in particular to a charging circuit, a charging device and a display screen.
Background
With the development of display screen technology, more and more display screens are used for various scenes, so that the use ways of various displays are continuously increased in daily life. Since the display screen is used for displaying images, power needs to be supplied to ensure normal operation. Traditional large-scale display screen is supplied power through the switch board, and the switch board converts 380V's industrial electricity into 220V's commercial power consumption, later converts the operating voltage that the display screen used into again, and wherein, at the in-process of power supply, charge the energy storage electric capacity of display screen, and the energy storage electric capacity lasts the power supply to the display screen to in-process of improvement display screen.
However, in the process of charging the energy storage capacitor, the voltages at the two ends of the energy storage capacitor change with each other, so that the charging power of the energy storage capacitor fluctuates dramatically, the input power of the display screen fluctuates dramatically, and the operation stability of the display screen is reduced.
Disclosure of Invention
Accordingly, there is a need for a charging circuit, a charging device and a display panel with stable charging power output.
A charging circuit, comprising: resonance circuit, rectifier and filter circuit and constant power control module, resonance circuit's input is used for being connected with external power source, resonance circuit's output with rectifier and filter circuit's input is connected, rectifier and filter circuit's output with constant power control module's input is connected, rectifier and filter circuit's output is used for exporting direct current signal, constant power control module's output is used for being connected with energy storage capacitor, constant power control module's output still is used for adjusting the charging power parameter according to energy storage capacitor's voltage, so that constant power control module is energy storage capacitor output constant power.
In one embodiment, the constant power control module includes a feedforward control unit, an output terminal of the rectification filter circuit is connected to an input terminal of the feedforward control unit, an output terminal of the feedforward control unit is connected to an energy storage capacitor, and the feedforward control unit is configured to adjust charging power.
In one embodiment, the constant power control module includes a feedback control unit, an output end of the rectification filter circuit is connected to an input end of the feedback control unit, a comparison end of the feedback control unit is further connected to an output end of the feedback control unit and a power preset end, respectively, an output end of the feedback control unit is used for being connected to the energy storage capacitor, and the feedback control unit is used for adjusting charging power according to power of the output end of the feedback control unit and power of the power preset end.
In one embodiment, the feedback control unit includes a comparator, a regulator and a power control circuit, an output terminal of the rectifying and filtering circuit is connected to an input terminal of the power control circuit, a comparison terminal of the comparator is further connected to an output terminal of the power control circuit and a power preset terminal, an output terminal of the comparator is connected to an input terminal of the power control circuit through the regulator, and an output terminal of the power control circuit is used for being connected to the energy storage capacitor.
In one embodiment, the power control circuit comprises a control chip and a power output circuit, the output end of the regulator is connected with the input end of the control chip, the output end of the control chip is connected with the input end of the power output circuit, and the output end of the power output circuit is used for being connected with the energy storage capacitor.
In one embodiment, the feedback control unit further includes a power detector, and the output terminal of the power control circuit is connected to the input terminal of the comparator through the power detector, and the power detector is configured to obtain the charging power.
In one embodiment, the resonant circuit includes a second inductor and a third capacitor, and an external power supply is connected to the input terminal of the rectifying and filtering circuit through the resonant resistor and the third capacitor in sequence.
In one embodiment, the charging circuit further comprises a charging power detection circuit, the charging power detection circuit comprises a voltage detection circuit and a current detection circuit, the output end of the constant power control module is connected with the input end of the voltage detection circuit, the output end of the constant power control module is further connected with the input end of the current detection circuit, and the output end of the voltage detection circuit and the output end of the current detection circuit are connected with a monitoring system and used for detecting the charging voltage and the charging current input to the energy storage capacitor.
A charging device comprising a charging circuit as described in any of the above embodiments.
The utility model provides a display screen, includes the display module assembly and as in above embodiment charging device, the display module assembly has the display surface, charging device set up in the display module assembly deviates from the one side of display surface.
Among above-mentioned charging circuit, charging device and display screen, the signal of telecommunication of external power source input obtains required direct current signal after resonance circuit and rectification filter circuit, later charges for energy storage capacitor with the direct current signal of telecommunication through constant power control module, and constant power control module will input to energy storage capacitor's power and adjust for output stable charging power, reduced the energy storage capacitor change and leaded to the undulant probability of charging power, improved the operating stability of display screen.
Drawings
Fig. 1 is a circuit diagram of a charging circuit according to an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The present invention relates to a charging circuit. In one embodiment, the charging circuit includes: resonance circuit, rectifier and filter circuit and constant power control module, resonance circuit's input is used for being connected with external power source, resonance circuit's output with rectifier and filter circuit's input is connected, rectifier and filter circuit's output with constant power control module's input is connected, rectifier and filter circuit's output is used for exporting direct current signal, constant power control module's output is used for being connected with energy storage capacitor, constant power control module's output still is used for adjusting the charging power parameter according to energy storage capacitor's voltage, so that constant power control module is energy storage capacitor output constant power. The electric signal of external power source input obtains required direct current signal behind resonance circuit and rectification filter circuit, later charges for energy storage capacitor through the constant power control module with the direct current signal of telecommunication, and the constant power control module will be inputed to energy storage capacitor's power and adjust for output stable charging power, reduced the energy storage capacitor change and leaded to the undulant probability of charging power, improved the operating stability of display screen.
Please refer to fig. 1, which is a circuit diagram of a charging circuit according to an embodiment of the invention.
A charging circuit 10 comprising: resonant circuit 100, rectifier and filter circuit 200 and constant power control module 300, resonant circuit 100's input is used for being connected with external power source, resonant circuit 100's output with rectifier and filter circuit 200's input is connected, rectifier and filter circuit 200's output with constant power control module 300's input is connected, rectifier and filter circuit 200's output is used for exporting the direct current signal of telecommunication, constant power control module 300's output is used for being connected with energy storage capacitor, constant power control module 300's output still is used for adjusting the charging power parameter according to energy storage capacitor's voltage, so that constant power control module 300 is energy storage capacitor output constant power.
In this embodiment, after the electrical signal input by the external power source passes through the resonant circuit 100 and the rectifying and filtering circuit 200, the required dc electrical signal is obtained, and then the dc electrical signal is charged for the energy storage capacitor through the constant power control module 300, and the constant power control module 300 adjusts the power input to the energy storage capacitor, so that stable charging power is output, the probability of charging power fluctuation caused by the change of the energy storage capacitor is reduced, and the output stability of the charging circuit is improved. In one embodiment, the energy storage capacitor comprises a plurality of farad super capacitors connected in series to form a farad super capacitor bank, the capacitance value of the farad super capacitor is 0.1-1000F, and the withstand voltage value is 2-3V, for example, the farad super capacitor bank comprises 5 farad super capacitors connected in series, the capacitance value of the farad super capacitor bank is 180F, and the withstand voltage value of the farad super capacitor bank is 2.7V, so that the capacitance value of the farad super capacitor bank is 36F, and the withstand voltage value of the farad super capacitor bank is 13.5V, and the energy storage capacitor stores 1800 joules of electric energy when the charging voltage is 10V.
In one embodiment, referring to fig. 1, the constant power control module 300 includes a feedforward control unit 310, an output terminal of the rectifying and filtering circuit 200 is connected to an input terminal of the feedforward control unit 310, an output terminal of the feedforward control unit 310 is connected to an energy storage capacitor, and the feedforward control unit 310 is configured to adjust charging power. In the present embodiment, the feedforward control unit 310 has a feedforward control system, and belongs to an open-loop control system. The feedforward control unit 310 is based on the charging characteristic of the energy storage capacitor, and the feedforward control unit 310 is based on the characteristic that the charging voltage of the energy storage capacitor changes with time, for example, when the number of the energy storage capacitors and the signal are determined, the capacitance value of the energy storage capacitor is fixed, and according to the capacitance energy storage formula:
wherein C is the capacitance of the energy storage capacitor, Uc(t) is the voltage of the energy storage capacitor changing along with time, P is the charging power of the energy storage capacitor, and the functional relation between the energy storage capacitor and the charging power can be deduced according to the above, specifically as follows:
in this way, the feedforward control unit 310 correspondingly adjusts the duty ratio of a PWM (Pulse Width Modulation) signal of the charging power according to the relationship between the energy storage capacitor and the charging power, so that the power output to the energy storage capacitor is constant power, the charging power for charging the energy storage capacitor is stable, the fluctuation of the charging power is reduced, and the charging stability of the charging circuit for the energy storage capacitor is improved.
In one embodiment, referring to fig. 1, the constant power control module 300 includes a feedback control unit 320, an output end of the rectifying and filtering circuit 200 is connected to an input end of the feedback control unit 320, a comparison end of the feedback control unit 320 is further connected to an output end of the feedback control unit 320 and a power preset end, respectively, an output end of the feedback control unit 320 is used for being connected to an energy storage capacitor, and the feedback control unit 320 is used for adjusting charging power according to the power of the output end of the feedback control unit 320 and the power of the power preset end. In this embodiment, the feedback control unit 320 has a feedback control system, and belongs to a closed-loop control system. Because the output end of the feedback control unit 320 is connected to the energy storage capacitor, the feedback control unit 320 obtains the real-time charging power of the energy storage capacitor, the charging power output by the rectifying and filtering circuit 200 is processed by the feedback control unit 320, and the charging power output by the output end of the rectifying and filtering circuit 200 is compared by the feedback of the feedback control unit 320, so as to adjust the output of the feedback control unit 320. The feedback control unit 320 compares the real-time output power of the feedback control unit 320 with the preset power of the power preset terminal, and feeds back the result after comparison to the feedback control unit 320, so that the output of the feedback control unit 320 is adjusted. Specifically, the feedback control unit 320 transmits the real-time charging power output by the output terminal of the feedback control unit 320 to the input terminal of the feedback control unit 320, the charging power of the feedback control unit 320 and the preset power of the preset power terminal perform difference operation to generate a power deviation signal, and the feedback control unit 320 obtains the duty ratio of the PWM signal of the charging power according to the power deviation signal, so as to adjust the charging power output by the rectifying and filtering circuit 200, so that the charging power of the output terminal of the feedback control unit 320 is adjusted to the same power as the preset power, and the charging power of the energy storage capacitor is stable.
In one embodiment, referring to fig. 1, the feedback control unit 320 includes a comparator 322, a regulator 324 and a power control circuit 326, an output terminal of the rectifying and filtering circuit 200 is connected to an input terminal of the power control circuit 326, a comparing terminal of the comparator 322 is further connected to an output terminal of the power control circuit 326 and a power preset terminal, respectively, an output terminal of the comparator 322 is connected to an input terminal of the power control circuit 326 through the regulator 324, and an output terminal of the power control circuit 326 is used for being connected to the energy storage capacitor. In this embodiment, the power control circuit 326 obtains the power output by the rectifying and filtering circuit 200, the comparator 322 feeds back the real-time charging power output by the power control circuit 326 to the comparator 322, that is, the power output by the rectifying and filtering circuit 200 is fed back to the comparator 322 through the control circuit, the comparator 322 compares the fed-back real-time charging power output by the power control circuit 326 with the preset power output by the power preset terminal, the comparator 322 outputs a power deviation signal according to the comparison result, that is, the output terminal of the comparator 322 outputs the power deviation signal, that is, the power deviation signal is transmitted to the regulator 324, the regulator 324 calculates the duty ratio of the PWM signal of the charging power according to the power deviation signal through arithmetic operation, the power control circuit 326 controls the finally output charging power according to the duty ratio of the PWM signal, the charging power output by the feedback control unit 320 is adjusted, so that the charging power actually output by the feedback control unit 320 is kept equal, and the charging power output by the feedback control unit 320 is stable. In one embodiment, the regulator includes a PI (Proportional Integral) regulator that calculates a duty cycle of the corresponding PWM signal using a PI control algorithm. In one embodiment, the charging power finally output by the feedback control unit is equal to the preset power.
In one embodiment, referring to fig. 1, the power control circuit 326 includes a control chip U1 and a power output circuit, the output terminal of the regulator 324 is connected to the input terminal of the control chip U1, the output terminal of the control chip U1 is connected to the input terminal of the power output circuit, and the output terminal of the power output circuit is used for being connected to the energy storage capacitor. In this embodiment, the input end of the control chip U1 is connected to the output end of the regulator 324, so that the control chip U1 obtains the duty ratio parameter of the processed PWM signal, and the control chip U1 controls the power output by the power output circuit according to the duty ratio of the PWM signal, so that the charging power output by the power output circuit is equal to the preset power, and thus the charging circuit provides the charging power with a fixed value for the energy storage capacitor, and the output power of the charging circuit is stable.
In one embodiment, the power output circuit includes a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a first diode D1, a first inductor L1, a first electronic switching tube Q1, and a second electronic switching tube Q2, a power supply end of the control chip U1 is configured to be connected to a power supply, an anode of the first diode D1 is configured to be connected to the power supply, a cathode of the first diode D1 is connected to an output end of the control chip U1 through the first capacitor C1, a first control end of the control chip U1 is connected to a control end of the first electronic switching tube Q1 through the first resistor R1, an output end of the rectifying and filtering circuit 200 is connected to a first end of the first electronic switching tube Q1, a second end of the first electronic switching tube Q1 is connected to a first end of the second electronic switching tube Q2, and a second end of the control chip U2 is connected to the second electronic switching tube Q57324 through the second resistor R2 The second end of the second electronic switching tube Q2 is grounded, the first end of the second electronic switching tube Q2 is further connected with the first end of the second capacitor C2 through the first inductor L1, the first end of the second capacitor C2 is connected with the input end of the comparator 322, the first end of the second capacitor C2 is further used for being connected with the energy storage capacitor, and the second end of the second capacitor C2 is grounded. In this embodiment, the control chip U1 obtains the duty ratio parameter of the PWM signal output by the regulator 324, and correspondingly controls the on-off states of the first control terminal and the second control terminal of the control chip U1, so as to adjust the charging power. For example, when charging is required, the control chip U1 turns on the first electronic switch Q1 through the first control terminal, and the control chip U1 also turns off the second electronic switch Q2 through the second control terminal, that is, the control chip U1 sends an on signal to the control terminal of the first electronic switch Q1 through the first control terminal, the control chip U1 sends an off signal to the control terminal of the second electronic switch Q2 through the second control terminal, the voltage output by the output terminal of the rectifying and filtering circuit 200 performs energy storage charging on the first inductor L1 and the second capacitor C2 through the first electronic switch Q1, after a predetermined time of charging, the second electronic switch Q2 is turned off, the second electronic switch Q2 is turned on, so that the second electronic switch Q2 forms an output loop with the first inductor L1 and the second capacitor C2, that is, the second capacitor C2 outputs the required power, that is, the second capacitor C2 outputs the corresponding charging power. Since the on-off time of the on-off signal sent by the first control end and the second control end of the control chip U1 is determined according to the duty ratio of the PWM signal, the adjustment of the charging power output by the power control circuit 326 is realized by controlling the on-time of the first electronic switching tube Q1, so that the charging power output by the power control circuit 326 is the same as the preset power, and the charging power output by the power control circuit 326 is stable.
In one embodiment, referring to fig. 1, the power output circuit further includes a second diode D2, the first end of the second capacitor C2 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the input terminal of the comparator 322, and the cathode of the second diode D2 is further used to be connected to the energy storage capacitor, so that the power output by the power output circuit is half of the total power, thereby realizing half-bridge power output, i.e., using half of the power output by the power output circuit as the charging power, so that the power output by the power output circuit is consistent, and further improving the stability of the charging power.
In one embodiment, the feedback control unit further includes a power detector, and the output terminal of the power control circuit is connected to the input terminal of the comparator through the power detector, and the power detector is configured to obtain the charging power. In this embodiment, since the electrical signals that are easily detected in the circuit are mainly voltage signals and current signals, and the real-time power output by the power control circuit is to be obtained, the power detector converts the detected output voltage and output current of the power control circuit into corresponding values, that is, the output power of the power control circuit is convenient for comparing the real-time output power of the power control circuit with the preset power of the power preset end, so as to obtain the duty ratio parameters of the corresponding PWM signals, and further, the charging power output by the power control circuit is convenient to adjust, and the stability of the charging power output by the power control circuit is improved.
In one embodiment, referring to fig. 1, the resonant circuit 100 includes a second inductor L2 and a third capacitor C3, and an external power source is connected to the input terminal of the rectifying and filtering circuit 200 through the resonant resistor and the third capacitor C3 in sequence. In this embodiment, the second inductor L2 and the third capacitor C3 are connected in series to form an LC oscillating circuit, thereby generating magnetic resonance. According to the characteristics of the LC oscillating circuit, the frequency of the electric signal input to the resonant circuit 100 is selected, that is, the frequency corresponding to the required charging power is selected, so that the fluctuation of the electric signal input to the charging circuit is reduced, and the stability of the charging power output by the charging circuit is improved. In one embodiment, the second inductor and the third capacitor are connected in parallel. In one embodiment, the charging circuit 10 further includes a third resistor R3, the resonant circuit 100 is connected to the rectifying and filtering circuit 200 through the third resistor R3, and the third resistor R3 is used to limit the current of the output of the resonant circuit 100, so as to avoid excessive current input to the rectifying and filtering circuit 200 and the constant power control module 300. In one embodiment, the charging circuit and the external power supply perform power transmission in a wireless manner, and the external power supply performs electromagnetic conversion with the second inductor L2 through an inductor, so as to generate an induced voltage and an induced current on the enemy inductor and provide power for the charging circuit to charge the energy storage capacitor, so that the second inductor L2 and the inductor in the external power supply circuit form a transformer to perform wireless power transmission. In one embodiment, the voltage provided by the external power supply is larger, so that the induced voltage on the second inductor L2 is larger, and the third capacitor C3 adopts a capacitor bank with a larger withstand voltage value, for example, the third capacitor C3 includes an electrolytic capacitor bank with a withstand voltage value of 100-300V.
In one embodiment, referring to fig. 1, the charging circuit 10 further includes a charging power detection circuit 400, the charging power detection circuit 400 includes a voltage detection circuit 410 and a current detection circuit 420, an output terminal of the constant power control module 300 is connected to an input terminal of the voltage detection circuit 410, an output terminal of the constant power control module 300 is further connected to an input terminal of the current detection circuit 420, and an output terminal of the voltage detection circuit 410 and an output terminal of the current detection circuit 420 are connected to a monitoring system and are configured to detect a charging voltage and a charging current input to the energy storage capacitor. In this embodiment, the voltage detection circuit 410 obtains a charging voltage for charging the energy storage capacitor, the current detection circuit 420 obtains a charging current for charging the energy storage capacitor, and the monitoring system determines whether the charging power for charging the energy storage capacitor is within the working power range according to the charging voltage and the charging current. When the charging power is greater than the maximum value of the working power, the monitoring system sends an output stopping signal to the constant power control module 300, and the charging is continuously stopped for a corresponding time, so that the charging power of the energy storage capacitor is prevented from being too high, and the normal operation of the charging circuit is ensured.
In one embodiment, referring to fig. 1, the voltage detection circuit 410 includes a fourth resistor R4 and a fifth resistor R5, an output terminal of the constant power control module 300 is connected to a first terminal of the fifth resistor R5 through the fourth resistor R4, a second terminal of the fifth resistor R5 is grounded, and a first terminal of the fifth resistor R5 is used for being connected to a monitoring system. In this embodiment, the output end of the constant power control module 300 outputs charging power, that is, the output end of the constant power control module 300 outputs charging voltage and charging current, the first end of the fifth resistor R5 is used as a detection end of the charging voltage, the fourth resistor R4 is connected in series with the fifth resistor R5, voltage division processing is performed on the charging voltage, the first end of the fifth resistor R5 transmits part of the charging voltage to the monitoring system, that is, the voltage transmitted to the monitoring system is the charging voltage distributed according to a certain proportion, that is, the voltage transmitted to the monitoring system is the divided voltage of the charging voltage, detection is performed through the divided voltage of the charging voltage, and according to the ratio of the fourth resistor R4 to the fifth resistor R5, the size of the charging voltage is directly obtained, so that detection on the charging voltage is facilitated. In one embodiment, the voltage detection circuit 410 further includes a fourth capacitor C4, the first end of the fifth resistor R5 is grounded through the fourth capacitor C4, the voltage of the fourth capacitor C4 is the voltage of the fifth resistor R5, that is, the voltage of the fourth capacitor C4 is the divided voltage of the charging voltage input into the monitoring system, the voltage of the fourth capacitor C4 decreases the rate of change of the voltage of the fifth resistor R5, and the abrupt change of the voltage of the fifth resistor R5 is decreased, so that the probability of voltage overshoot of the voltage input to the monitoring system is decreased.
In one embodiment, referring to fig. 1, the current detection circuit 420 includes a current collection chip U2 and a sixth resistor R6, the output terminal of the constant power control module 300 is connected to the first detection terminal of the current collection chip U2, the output terminal of the constant power control module 300 is further connected to the second detection terminal of the current collection chip U2 through the sixth resistor R6, and the output terminal of the current collection chip U2 is connected to a monitoring system. In this embodiment, the first detection end and the second detection end of the current collection chip U2 are configured to obtain the voltage across the sixth resistor R6, and according to the voltage and the resistance of the sixth resistor R6, the output end of the current collection chip U2 charges the current, so that the monitoring system obtains the charging current for charging the energy storage capacitor.
In one embodiment, referring to fig. 1, the rectifying and filtering circuit 200 includes a rectifying bridge BD1 and a filtering circuit 210, the filtering circuit 210 includes a third inductor L3, a fifth capacitor C5 and a sixth capacitor C6, an output terminal of the resonant circuit 100 is connected to an input terminal of the rectifying bridge BD1, a first output terminal of the rectifying bridge BD1 is connected to a first terminal of the fifth capacitor C5, a second terminal of the fifth capacitor C5 is grounded, a first output terminal of the rectifying bridge BD1 is connected to a first terminal of the sixth capacitor C6 through the third inductor L3, a second terminal of the sixth capacitor C6 is grounded, and a second terminal of the sixth capacitor C6 is connected to an input terminal of the constant power control module 300. In this way, the electric signal output by the resonant circuit 100 passes through the rectifier bridge BD1 and then outputs a dc signal, and the filter circuit 210 filters through the fifth capacitor C5 and the sixth capacitor C6, and through a filter loop formed by the third inductor L3, the filter circuit 210 has a stronger filter characteristic, so as to filter a high-frequency signal, and further facilitate obtaining a stable and low-interference dc signal.
In one embodiment, a charging device is provided, comprising a charging circuit as described in any of the above embodiments. The electric signal of external power source input obtains required direct current signal behind resonance circuit and rectification filter circuit, later charges for energy storage capacitor through the constant power control module with direct current signal of telecommunication, and the constant power control module will be inputed to energy storage capacitor's power and adjust for output stable charging power, reduced energy storage capacitor change and leaded to the undulant probability of charging power, improved charging device's operating stability.
In one embodiment, a display screen is provided, which includes a display module and the charging device in the above embodiment, wherein the display module has a display surface, and the charging device is disposed on a surface of the display module departing from the display surface. In the display screen, the electric signal input by the external power supply passes through the resonance circuit and the rectification filter circuit to obtain the required direct current signal, then the direct current signal is charged for the energy storage capacitor through the constant power control module, and the constant power control module adjusts the power input to the energy storage capacitor, so that the stable charging power is output, the probability of charging power fluctuation caused by the change of the energy storage capacitor is reduced, and the operation stability of the display screen is improved.
In one embodiment, the charging device is a wireless charging device, a resonant circuit of the charging device serves as a wireless receiving end, energy of a wireless transmitting end part of an external power supply is transmitted to the resonant circuit, the resonant circuit comprises a second inductor and a third capacitor, the wireless transmitting end of the external power supply is wirelessly connected with an input end of the rectification filter circuit sequentially through the resonant resistor and the third capacitor, the wireless transmitting end of the external power supply is provided with an inductor, and forms a transformer with the second inductor, so that electric energy of the external power supply is transmitted to the second inductor in a magnetic induction mode.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A charging circuit, comprising: the constant power control circuit comprises a resonance circuit, a rectification filter circuit and a constant power control module, wherein the input end of the resonance circuit is used for being connected with an external power supply, the output end of the resonance circuit is connected with the input end of the rectification filter circuit, the output end of the rectification filter circuit is connected with the input end of the constant power control module, the output end of the rectification filter circuit is used for outputting a direct current signal, the output end of the constant power control module is used for being connected with an energy storage capacitor, and the output end of the constant power control module is also used for adjusting a charging power parameter according to the voltage of the energy storage capacitor so that the constant power control module outputs constant power for the energy storage capacitor;
the constant power control module comprises a feedforward control unit and a feedback control unit; the output end of the rectification filter circuit is connected with the input end of the feedforward control unit, and the output end of the feedforward control unit is connected with the input end of the feedback control unit; the feedforward control unit is provided with a feedforward control system belonging to an open-loop control system and is used for correspondingly adjusting the duty ratio of the PWM signal of the feedforward control unit according to the relation between the charging power of the energy storage capacitor and the charging power of the energy storage capacitor, so that the charging power output by the feedforward control unit is constant power;
the input end of the feedback control unit is connected with the output end of the feedforward control unit, the comparison end of the feedback control unit is respectively connected with the output end of the feedback control unit and the power preset end, and the output end of the feedback control unit is used for being connected with the energy storage capacitor; the feedback control unit is provided with a feedback control system belonging to a closed-loop control system, and is used for carrying out difference operation on the charging power of the output end of the feedback control unit and the preset power of the preset power end to generate a power deviation signal; and acquiring the duty ratio of the PWM signal of the feedback control unit according to the power deviation signal, so that the charging power of the output end of the feedback control unit is the same as the preset power.
2. The charging circuit according to claim 1, wherein the feedback control unit includes a comparator, a regulator and a power control circuit, the output terminal of the rectifying and filtering circuit is connected to the input terminal of the power control circuit, the comparison terminal of the comparator is further connected to the output terminal of the power control circuit and a power preset terminal, respectively, the output terminal of the comparator is connected to the input terminal of the power control circuit through the regulator, and the output terminal of the power control circuit is configured to be connected to the energy storage capacitor.
3. The charging circuit of claim 2, wherein the power control circuit comprises a control chip and a power output circuit, the output terminal of the regulator is connected to the input terminal of the control chip, the output terminal of the control chip is connected to the input terminal of the power output circuit, and the output terminal of the power output circuit is configured to be connected to the energy storage capacitor.
4. The charging circuit of claim 2, wherein the feedback control unit further comprises a power detector, and an output terminal of the power control circuit is connected to an input terminal of the comparator through the power detector, and the power detector is configured to obtain the charging power.
5. The charging circuit of claim 1, wherein the resonant circuit comprises a second inductor and a third capacitor, and an external power supply is connected to the input terminal of the rectifying and filtering circuit through the resonant resistor and the third capacitor in sequence.
6. The charging circuit of claim 1, further comprising a charging power detection circuit, wherein the charging power detection circuit comprises a voltage detection circuit and a current detection circuit, an output terminal of the constant power control module is connected to an input terminal of the voltage detection circuit, an output terminal of the constant power control module is further connected to an input terminal of the current detection circuit, and an output terminal of the voltage detection circuit and an output terminal of the current detection circuit are connected to a monitoring system and are configured to detect a charging voltage and a charging current input to the energy storage capacitor.
7. The charging circuit of claim 6, wherein the voltage detection circuit comprises a fourth resistor and a fifth resistor, the output terminal of the constant power control module is connected to a first terminal of the fifth resistor through the fourth resistor, a second terminal of the fifth resistor is connected to ground, and the first terminal of the fifth resistor is connected to the monitoring system.
8. The charging circuit of claim 6, wherein the current detection circuit comprises a current collection chip and a sixth resistor; the output end of the constant power control module is connected with the first detection end of the current acquisition chip, the output end of the constant power control module is further connected with the second detection end of the current acquisition chip through the sixth resistor, and the output end of the current acquisition chip is connected with the monitoring system.
9. A charging device comprising a charging circuit as claimed in any one of claims 1 to 8.
10. A display screen, comprising a display module and the charging device as claimed in claim 9, wherein the display module has a display surface, and the charging device is disposed on a surface of the display module facing away from the display surface.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911233007.7A CN110957795B (en) | 2019-12-05 | 2019-12-05 | Charging circuit, charging device and display screen |
| PCT/CN2020/100020 WO2021109561A1 (en) | 2019-12-05 | 2020-07-03 | Charging circuit, charging device, and display screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911233007.7A CN110957795B (en) | 2019-12-05 | 2019-12-05 | Charging circuit, charging device and display screen |
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| CN110957795A CN110957795A (en) | 2020-04-03 |
| CN110957795B true CN110957795B (en) | 2021-08-06 |
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| CN110957795B (en) * | 2019-12-05 | 2021-08-06 | 深圳市洲明科技股份有限公司 | Charging circuit, charging device and display screen |
| CN112260318B (en) * | 2020-10-31 | 2021-11-16 | 厦门市合佳兴电子有限公司 | System for improving stability of 5G communication base station and control method thereof |
| CN113381478B (en) * | 2021-06-16 | 2022-07-29 | 深圳市诚芯微科技股份有限公司 | Constant power control circuit and method of intelligent power supply and intelligent power supply |
Family Cites Families (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2303229B (en) * | 1995-03-30 | 1999-06-02 | Eddie Palin Distribution Limit | Constant power output circuit |
| JP3438647B2 (en) * | 1999-05-14 | 2003-08-18 | 株式会社村田製作所 | Charge controller |
| US7622820B1 (en) * | 2007-03-16 | 2009-11-24 | Aleksandar Prodic | Switch-mode power supply (SMPS) with auto-tuning using limit-cycle oscillation response evaluation |
| CN201178324Y (en) * | 2008-03-26 | 2009-01-07 | 可立克科技(深圳)有限公司 | Charging power source circuit of secondary battery pack |
| CN201490769U (en) * | 2009-05-06 | 2010-05-26 | 上海库源电气科技有限公司 | Intelligent charging management device for super capacitor |
| CN201910625U (en) * | 2010-10-14 | 2011-07-27 | 国网电力科学研究院 | Grid-connected photovoltaic inverter based on super capacitor |
| CN102421218B (en) * | 2011-04-22 | 2013-12-25 | 中山市诚创电器有限公司 | Large power LED high efficiency driving power supply |
| JP5887841B2 (en) * | 2011-11-02 | 2016-03-16 | ソニー株式会社 | Control system |
| JP2013102574A (en) * | 2011-11-07 | 2013-05-23 | Sony Corp | Charge controlling method and discharge controlling method, charging apparatus controller and discharging apparatus controller, and charge controlling program and discharge controlling program |
| CN102403770A (en) * | 2011-12-07 | 2012-04-04 | 东南大学 | Device and method for charging super capacitor |
| CN103036285B (en) * | 2012-12-07 | 2015-12-02 | 陕西千山航空电子有限责任公司 | A kind of super capacitor charging circuit |
| CN103051040A (en) * | 2013-01-28 | 2013-04-17 | 罗利文 | Capacitive energy storage type rechargeable battery and charging device thereof |
| KR101365160B1 (en) * | 2013-05-20 | 2014-02-20 | 박노식 | Intelligent battery charging device |
| JP6069103B2 (en) * | 2013-05-30 | 2017-01-25 | 日本リライアンス株式会社 | Battery charging / discharging device, charging / discharging method, and program |
| CN203617758U (en) * | 2013-12-16 | 2014-05-28 | 四川升华电源科技有限公司 | Constant-power charge power supply |
| CN104901429A (en) * | 2014-03-05 | 2015-09-09 | 库珀工业控股（爱尔兰）公司 | Magnetic coupling resonant wireless energy transmission receiving circuit |
| US10103585B2 (en) * | 2015-12-18 | 2018-10-16 | Intel IP Corporation | Regulated load modulation circuit and method for producing regulated load modulation signaling |
| CN105914899B (en) * | 2016-05-31 | 2018-03-27 | 河海大学常州校区 | It is a kind of can two-way operation radio energy transmission system and method |
| CN106026334B (en) * | 2016-07-27 | 2019-01-11 | 西安科技大学 | Super capacitor three stage charging system circuit and its method for super capacitor fast charging |
| CN106602865B (en) * | 2016-12-26 | 2019-10-25 | 中国电子科技集团公司第十一研究所 | A kind of energy storage capacitor charging circuit and pulse laser power supply |
| CN107040022A (en) * | 2017-05-02 | 2017-08-11 | 中国工程物理研究院激光聚变研究中心 | A kind of piecewise linearity capacitor constant-current charging power |
| CN107618388B (en) * | 2017-09-26 | 2023-10-31 | 伽行科技（北京）有限公司 | Wireless charging system of electric automobile |
| CN110147049A (en) * | 2018-02-12 | 2019-08-20 | 胡语嫣 | A kind of accumulator |
| CN208241386U (en) * | 2018-05-16 | 2018-12-14 | 无锡联力电子科技股份有限公司 | A kind of constant-power charging circuit |
| CN108683269B (en) * | 2018-05-31 | 2021-11-30 | 昆山国显光电有限公司 | Display module and charging method thereof |
| CN109066920A (en) * | 2018-09-29 | 2018-12-21 | 京东方科技集团股份有限公司 | A kind of mosaic display screen and its method of supplying power to, display device |
| CN209593296U (en) * | 2019-01-25 | 2019-11-05 | 上海衡亮电子科技股份有限公司 | A kind of pressure stabilizing rectification circuit of Novel outdoor LED display |
| CN110198087B (en) * | 2019-06-28 | 2020-12-08 | 四川中微芯成科技有限公司 | Wireless power supply control device and method for liquid crystal display |
| CN110957795B (en) * | 2019-12-05 | 2021-08-06 | 深圳市洲明科技股份有限公司 | Charging circuit, charging device and display screen |
-
2019
- 2019-12-05 CN CN201911233007.7A patent/CN110957795B/en active Active
-
2020
- 2020-07-03 WO PCT/CN2020/100020 patent/WO2021109561A1/en active Application Filing
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| WO2021109561A1 (en) | 2021-06-10 |
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