CN110012573B - Full-voltage control circuit - Google Patents
Full-voltage control circuit Download PDFInfo
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- CN110012573B CN110012573B CN201910272823.2A CN201910272823A CN110012573B CN 110012573 B CN110012573 B CN 110012573B CN 201910272823 A CN201910272823 A CN 201910272823A CN 110012573 B CN110012573 B CN 110012573B
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Abstract
A full voltage control circuit, the full voltage control circuit comprising: the device comprises a rectifying module, a detecting module, a first capacitor, a first resistor, a second resistor, a first constant current converter, a second constant current converter, a first diode and a second diode; the current input end of the first constant current converter and the first end of the first capacitor are connected with the rectifying module; the detection end of the first constant current converter is connected with the detection module; the second end of the second resistor, the grounding end of the first constant current converter and the grounding end of the second constant current converter are connected with the first end of the load; the current input end of the second constant current converter is connected with the cathode of the first diode, the second end of the first capacitor and the anode of the first diode are connected with the cathode of the second diode, and the anode of the second diode and the second end of the load are grounded.
Description
Technical Field
The invention belongs to the technical field of circuit control, and particularly relates to a full-voltage control circuit.
Background
In the current power supply system, voltage fluctuation of the power supply system is larger, and electronic equipment has different rated powers, so that different types of driving circuits are needed for the electronic circuits in the traditional technology to change power supply electric energy so as to ensure that various types of electronic equipment are in rated working states; taking an LED (LIGHTEMITTING DIODE, light-emitting diode) lamp driving as an example, a driving circuit needs to adjust the amplitude of input voltage in time so as to output stable power supply electric energy to a plurality of LEDs; the LED lamp constant current driving control mode in the traditional technology generally adopts a two-lamp string control mode, the working mode of the two lamp strings is controlled through timely detection of input voltage, when the input voltage changes, the two lamp strings are switched between series connection and parallel connection, the driving process of the LED lamp is extremely complex, and the LED lamp has the defects of insufficient power supply and insufficient brightness of the LED lamp in some critical states due to overlarge amplitude change range of the input voltage.
Therefore, the voltage driving circuit in the traditional technology cannot adaptively adjust the fluctuation of the input voltage in a large range, the fluctuation amplitude of the voltage output by the voltage driving circuit is large, the stability is not high, and the circuit safety of electronic equipment is damaged.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a full-voltage control circuit, which aims to solve the problems that the traditional technical scheme cannot adaptively adjust the fluctuation value of the input voltage in a large range and the stability and reliability of the voltage output by the traditional voltage driving circuit are lower.
A first aspect of an embodiment of the present invention provides a full-voltage control circuit connected to a load, the full-voltage control circuit including: the device comprises a rectifying module, a detecting module, a first capacitor, a first resistor, a second resistor, a first constant current converter, a second constant current converter, a first diode and a second diode;
The rectification module is connected with an alternating current power supply and used for converting alternating current output by the alternating current power supply into direct current;
The detection module is connected with the rectification module and is used for detecting the amplitude of the direct current and generating detection voltage;
The current input end of the first constant current converter and the first end of the first capacitor are connected with the rectifying module;
the detection end of the first constant current converter is connected with the detection module;
The external resistor end of the first constant current converter is connected with the first end of the first resistor, the second end of the first resistor and the first end of the second resistor are connected with the external resistor end of the second constant current converter, and the second end of the second resistor, the grounding end of the first constant current converter and the grounding end of the second constant current converter are connected with the first end of the load;
The current input end of the second constant current converter is connected with the cathode of the first diode, the second end of the first capacitor and the anode of the first diode are connected with the cathode of the second diode, and the anode of the second diode and the second end of the load are grounded.
In one embodiment, the rectifying module includes a third resistor and a rectifying bridge;
The first end of the third resistor is connected with the anode of the alternating current power supply, the first end of the third resistor is connected with the anode input end of the rectifier bridge, the cathode input end of the rectifier bridge is connected with the cathode of the alternating current power supply, the cathode output end of the rectifier bridge is grounded, and the anode output end of the rectifier bridge is connected with the detection module.
In one embodiment thereof, the detection module comprises: a fourth resistor and a fifth resistor;
The first end of the fourth resistor is connected with the rectifying module, the second end of the fourth resistor and the first end of the fifth resistor are connected with the detection end of the first constant current converter in a sharing mode, and the second end of the fifth resistor is connected with the load.
In one embodiment, when the detected voltage is smaller than a first preset voltage, the first constant current converter generates a first constant current power supply according to the direct current, and the first constant current power supply flows through the first resistor and the second resistor to supply power to the load.
In one embodiment, when the detected voltage is less than a second preset voltage and the second preset voltage is less than the first preset voltage, the first constant current converter generates the current of the first constant current power supply according to the following equation:
IOUT1＝Vrext1RD
The I OUT1 is the current of a first constant current power supply, the V rext1 is the internal reference voltage of the first constant current converter, and the R D is the sum of the resistance value of the first resistor and the resistance value of the second resistor.
In one embodiment, when the detected voltage is greater than or equal to the second preset voltage and less than the first preset voltage, the first constant current converter generates the current of the first constant current power supply according to the following formula:
IOUT1＝(Vrext1-(VVT-Uvt)*Vrext1)/RD
In the above formula, V VT is the voltage compared with the internal detection port of the first constant current converter, and U VT is the voltage of the detection port of the first constant current converter.
In one embodiment, when the detected voltage is greater than or equal to a first preset voltage, the second constant current converter generates a second constant current power supply according to the direct current flowing in through the first capacitor and the first diode, and the first constant current converter generates a third constant current power supply according to the direct current, the second constant current power supply flows through the second resistor to supply power to the load, and the third constant current power supply flows through the first resistor and the second resistor to supply power to the load.
In one embodiment, the second constant current converter generates the current of the second constant current power supply according to the following formula:
IOUT2＝Vrext2R2
In the above formula, the I OUT2 is the current of the second constant current power supply, the V rext2 is the internal reference voltage of the second constant current converter, and the R 2 is the resistance value of the second resistor;
The first constant current converter generates the current of the third constant current power supply according to the following formula:
IOUT3＝(Vrext1-(VVT-Uvt)*Vrext1)/RD
The current of the third constant current power supply is I OUT3, the sum of the resistance value of the first resistor and the resistance value of the second resistor is R D, the internal reference voltage of the first constant current converter is V rext1, the voltage of the detection end of the first constant current converter is U VT, and the internal detection port comparison voltage of the first constant current converter is V VT.
In one embodiment thereof, the first constant current converter includes: an internal reference voltage source, a first comparator, a second comparator, a first controlled current source, a second controlled current source, a first switching tube, a second switching tube, a sixth resistor and a seventh resistor;
The first input end of the first comparator is the detection end of the first constant current converter, the voltage control end of the first controlled current source is connected with a first direct current power supply, the voltage control end of the second controlled current source is connected with a second direct current power supply, the first current output end of the first controlled current source, the second current output end of the first controlled current source and the first current output end of the second controlled current source are connected with the first conducting end of the first switching tube in a sharing mode, and the output end of the first comparator is connected with the control end of the first switching tube;
The second conducting end of the first switch tube and the second input end of the first comparator are connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the first end of the internal reference voltage source, and the second end of the internal reference voltage source is the grounding end of the first constant current converter;
The first input end of the second comparator is connected with a preset voltage, the second current output end of the second controlled current source and the first end of the seventh resistor are connected with the second input end of the second comparator, the output end of the second comparator is connected with the control end of the second switching tube, and the first conduction end of the second switching tube is the current input end of the first constant current converter;
the second conducting end of the second switching tube and the second end of the seventh resistor jointly form an external resistor end of the first constant current converter.
In one embodiment thereof, the second constant current converter includes: a third comparator and a third switching tube;
the first input end of the third comparator is connected with a preset voltage, the output end of the third comparator is connected with the control end of the third switching tube, and the first conduction end of the third switching tube is the current input end of the second constant current converter;
The second input end of the third comparator and the second conducting end of the third switching tube jointly form an external resistor end of the second constant current converter.
The full-voltage control circuit acquires the amplitude change condition of the alternating current through the current sampling module, and when the amplitude of the alternating current changes in a large range, the first constant current converter and the second constant current converter are used for carrying out power-on operation on a load; according to the embodiment, the current amplitude output by the full-voltage control circuit is adjusted through the first resistor and the second resistor, so that the full-voltage control circuit can output stable power to a load in a large-range variation amplitude of alternating current, and the working safety and reliability of the load are ensured; the full-voltage control circuit has flexible regulation and control functions for the large-amplitude change of the alternating current, has a simple circuit structure, can keep normal operation in a full-voltage range, and has an extremely wide application range.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a full voltage control circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a rectifying module according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a detection module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first constant current converter according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second constant current converter according to an embodiment of the present invention;
fig. 6 is a schematic waveform diagram of a current according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a schematic structural diagram is provided in an embodiment of the present invention, wherein the schematic structural diagram is connected to a load 20, and the load 20 can always be connected to stable electric energy by adjusting an input current of the load 20; for convenience of explanation, only the portions related to the present embodiment are shown, and the detailed description is as follows:
as shown in fig. 1, the full-voltage control circuit includes: the device comprises a rectifying module 101, a detecting module 102, a first capacitor C1, a first resistor R1, a second resistor R2, a first constant current converter, a second constant current converter, a first diode D1 and a second diode D2.
The rectification module 101 is connected to an ac power source, and is configured to convert ac power output by the ac power source into dc power.
Optionally, the alternating current power source is derived from commercial power, and alternating current electric energy with different amplitude values can be output through the commercial power, so that the alternating current power source is applicable to various different types of domestic power utilization systems; the rectification module 101 has a function of converting alternating current into direct current; it should be noted that the direct current in the present embodiment has different magnitudes, and the magnitude of the direct current changes with the magnitude of the alternating current.
The detection module 102 is connected to the rectification module 101, and the detection module 102 is configured to detect the amplitude of the direct current and generate a detection voltage.
The detection module 102 has a function of sampling direct current, so that the detected voltage obtained by sampling can directly obtain the amplitude variation condition of alternating current, and the amplitude of the direct current can be obtained in real time through monitoring the detected voltage, so that the function of monitoring the electric quantity variation condition of the alternating current power supply is realized.
The current input terminal OUT of the first constant current converter and the first terminal of the first capacitor C1 are connected to the rectifying module 101.
The detection end VT of the first constant current converter is connected with the detection module 102.
The external resistor end REXT of the first constant current converter is connected with the first end of the first resistor R1, the second end of the first resistor R1 and the first end of the second resistor R2 are commonly connected with the external resistor end REXT of the second constant current converter, and the second end of the second resistor R2, the grounding end of the first constant current converter and the grounding end of the second constant current converter are connected with the first end of the load 20.
As an alternative embodiment, the first constant current converter and the second constant current converter can be integrated on one chip or can be designed on different chips.
The current input end OUT of the second constant-current converter is connected with the cathode of the first diode D1, the second end of the first capacitor C1 and the anode of the first diode D1 are connected with the cathode of the second diode D2, and the anode of the second diode D2 and the second end of the load 20 are grounded GND; wherein the second diode D2 may act as a freewheeling circuit to secure the power supply of the load 20.
When the detection module 102 outputs the detection voltage to the detection end VT of the first constant current converter, the first constant current converter is in different voltage conversion states when the detection voltage has different magnitudes, and then the first constant current converter can output a current with a corresponding magnitude to realize the power-on function of the load 20, and the load 103 is connected to the working current to maintain the rated working state.
Optionally, as an optional implementation manner, the load 20 is a plurality of LED lamps sequentially connected in series or a plurality of LED lamps sequentially connected in parallel; all the LED lamps can be kept stable in power in different power supply environments through the full-voltage control circuit, and the luminous effect of the LED lamps is improved.
As an alternative implementation, fig. 2 shows a schematic circuit structure of the rectifying module 101 provided in this embodiment, and referring to fig. 2, the rectifying module 101 includes a third resistor R3 and a rectifier bridge.
The first end of the third resistor R3 is connected to the positive electrode of the ac power supply, the first end of the third resistor R3 is connected to the positive electrode input end of the rectifier bridge, the negative electrode input end of the rectifier bridge is connected to the negative electrode of the ac power supply, the negative electrode output end of the rectifier bridge is connected to GND, and the positive electrode output end of the rectifier bridge is connected to the detection module 102.
Wherein, the rectifier bridge includes four diodes: diode DS1, diode DS2, diode DS3, and diode DS4; the diode can output stable direct current electric energy by utilizing the unidirectional conductivity of the diode, so that the rectifier bridge can accurately convert alternating current to output high-precision direct current, and the conversion rate of the electric energy is improved; the first resistor R1 has the function of current limiting, and can prevent the excessive amplitude of electric energy accessed by the full-voltage control circuit from damaging the physical safety performance of the full-voltage control circuit.
As an alternative implementation manner, fig. 3 shows a schematic circuit structure of the detection module 102 provided in this embodiment, referring to fig. 3, the detection module 102 includes: a fourth resistor R4 and a fifth resistor R5.
The first end of the fourth resistor R4 is connected to the rectifying module 101, the second end of the fourth resistor R4 and the first end of the fifth resistor 5 are commonly connected to the detection end VT of the first constant current converter, and the second end of the fifth resistor R5 is connected to the load 20.
As an alternative implementation manner, fig. 4 shows a schematic circuit structure of a first constant current converter provided in this embodiment, referring to fig. 4, the first constant current converter includes: an internal reference voltage source If, a first comparator INV1, a second comparator INV2, a first controlled current source I1, a second controlled current source I2, a first switching tube M1, a second switching tube M2, a sixth resistor R6 and a seventh resistor R7.
The first input end of the first comparator INV1 is a detection end VT of the first constant current converter, the detection end VT of the first constant current converter is connected to the detection module 102, the voltage control end of the first controlled current source I1 is connected to the first direct current power supply VDD1, the voltage control end of the second controlled current source I2 is connected to the second direct current power supply VDD2, the first current output end of the first controlled current source I1, the second current output end of the first controlled current source I1 and the first current output end of the second controlled current source I2 are commonly connected to the first conducting end of the first switching tube M1, and the output end of the first comparator INV1 is connected to the control end of the first switching tube M1.
The second conducting end of the first switching tube M1 and the second input end of the first comparator INV1 are commonly connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected to the first end of the internal reference voltage source If, and the second end of the internal reference voltage source If is the grounding end of the first constant current converter.
Alternatively, the internal reference voltage source If is a 1.2V dc power supply, and the internal reference voltage may be output through the internal reference voltage source If.
The first input end of the second comparator INV2 is connected to a preset voltage, the second current output end of the second controlled current source I2 and the first end of the seventh resistor R7 are commonly connected to the second input end of the second comparator INV2, the output end of the second comparator INV2 is connected to the control end of the second switching tube M2, and the first conducting end of the second switching tube M2 is the current input end OUT of the first constant current converter.
The second conducting end of the second switching tube M2 and the second end of the seventh resistor R7 together form an external resistor end REXT of the first constant-current converter, and the external resistor end REXT of the first constant-current converter is connected with the first resistor R1.
Optionally, the first switching tube M1 is a MOS tube or a triode, and the second switching tube M2 is a MOS tube or a triode.
Optionally, the first direct current power supply VDD1 is a 10V direct current power supply; the second direct current power supply VDD2 is a 10V direct current power supply; the third dc power supply VDD3 is a 10V dc power supply.
According to the embodiment, by utilizing the voltage comparison function of the first comparator INV1 and the second comparator INV2, corresponding working currents with corresponding amplitudes are output according to the magnitude between the detection voltage output by the detection module 102 and the preset voltage, so that the sensitivity and the precision of the working currents output by the first constant current converter are ensured, and the processing precision and the conversion efficiency of the first constant current converter for large-range electric energy amplitude variation are improved.
As an alternative implementation manner, fig. 5 shows a schematic circuit structure of a second constant current converter provided in this embodiment, referring to fig. 5, the second constant current converter includes: a third comparator INV3 and a third switching tube M3.
The first input end of the third comparator INV3 is connected with a preset voltage, the output end of the third comparator INV3 is connected with the control end of the third switching tube M3, and the first conduction end of the third switching tube M3 is the current input end OUT of the second constant current converter; and then the current can be connected through the current input end OUT of the second constant current converter.
The second input end of the third comparator INV3 and the second conducting end of the third switching tube M3 together form an external resistor end REXT of the second constant current converter, and the external resistor end REXT of the second constant current converter is connected with the first resistor R1 and the second resistor R2.
Optionally, the third switching tube M3 is a triode or a MOS tube.
According to the embodiment, the third comparator INV3 is used for comparing the amplitude of the voltage and outputting the working current so as to control the third switching tube M3 to be turned on or turned off, the negative working state can be driven by the working current, and the second constant current converter can also be used for converting and outputting the direct current electric energy with larger amplitude, so that the electric energy conversion stability of the second constant current converter is improved.
As an alternative implementation, fig. 6 shows a waveform diagram of direct current provided by the present embodiment, and the working principles of the first constant current converter and the second constant current converter will be specifically described below with reference to fig. 6.
In a specific implementation, the reference voltage of the first constant current converter is greater than the reference voltage of the second constant current converter.
When the detected voltage is smaller than a first preset voltage, referring to fig. 6, the first constant current converter generates a first constant current power supply according to the direct current, and the first constant current power supply flows through the first resistor and the second resistor to supply power to the load; meanwhile, the second constant current converter generates a second constant current power supply according to the direct current flowing in through the first capacitor C1 and the first diode D1, at the moment, the amplitude of the alternating current is lower, the voltage of the first constant current power supply (an external resistor end REXT) is larger than the internal reference voltage of the second constant current power supply, so that the second constant current power supply is closed, only the first constant current converter and the load form a working loop, and the first constant current converter can provide electric energy for the load 20.
In fig. 6, in the T1 period, when the detected voltage is less than the second preset voltage and the second preset voltage is less than the first preset voltage, the current of the first constant current power supply is:
IOUT1＝Vrext1RD(1)
Wherein in the above formula (1), the I OUT1 is the current of the first constant current power supply, the V rext1 is the internal reference voltage of the first constant current converter, and the R D is the sum of the resistance value of the first resistor and the resistance value of the second resistor; when the detection voltage is at a lower amplitude, the current of the first constant current power supply is kept stable.
Referring to fig. 6, in the period T2, when the detected voltage is greater than or equal to the second preset voltage and less than the first preset voltage, the current of the first constant current power supply is:
IOUT1＝(Vrext1-(VVT-Uvt)*Vrext1)/RD(2)
In the above formula (2), V VT is the voltage compared with the internal detection port of the first constant current converter, and U VT is the voltage of the detection port of the first constant current converter; please combine the internal circuit structure of the first constant current converter in fig. 4, so when the first constant current converter detects that the detected voltage is greater than the second preset voltage, the current output by the first constant current converter will show a certain decreasing trend.
The detection voltage of the detection end of the first constant current converter is detected to be higher than a second preset voltage in one alternating current period, and as can be known from the formula 2, the effective duty ratio of the REXT output current of the external resistor end of the first constant current converter is m% in one alternating current period, the duty ratio can be adjusted through the first resistor R1 and the second resistor R2, and the output current of the first constant current converter is a current integral value in m% duty ratio; the input power of the load at this time can be equivalently:
Wherein P1 is the output power of the load of the full-voltage control circuit in the period of T1, the integration interval T1 is the conduction time of the first constant current converter, and U LED is the voltage of the load.
Referring to fig. 6, in a T3 period, when the detected voltage is greater than or equal to a first preset voltage, the second constant current converter generates a second constant current power source according to the direct current flowing in through the first capacitor C1 and the first diode D2, and the first constant current converter generates a third constant current power source according to the direct current, the second constant current source flows through the second resistor R2 to supply power to the load 20, and the third constant current power source flows through the first resistor R1 and the second resistor R2 to supply power to the load 20; along with the continuous rising of the detection voltage, the VT port voltage of the first constant current converter is larger than or equal to a first preset voltage, meanwhile, the first constant current converter generates a first constant current power supply according to direct current, the amplitude of the alternating current is higher at the moment, the voltage of the first constant current power supply (an external resistor end REXT) is smaller than the reference voltage of the second constant current power supply, and at the moment, the electric energy passes through a first capacitor C1 and a first diode D1, and a working loop is formed by the second constant current converter and a load;
Optionally, the current of the second constant current power supply is:
IOUT2＝Vrext2R2 (4)
In the above formula, I OUT2 is the current of the second constant current power supply, V rext2 is the internal reference voltage of the second constant current converter, and R 2 is the resistance of the second resistor.
Optionally, the first constant current converter generates the current of the third constant current power supply according to the following formula:
IOUT3＝(Vrext1-(VVT-Uvt)*Vrext1)/RD (5)
The current of the third constant current power supply is I OUT3, the sum of the resistance value of the first resistor and the resistance value of the second resistor is R D, the internal reference voltage of the first constant current converter is V rext1, the voltage of the detection end of the first constant current converter is U VT, and the internal detection port comparison voltage of the first constant current converter is V VT.
Optionally, before one period ends, the first capacitor C1 is charged and discharged through the load, the first constant current converter, and the second diode D2.
The second preset voltage is 120V, and the first preset voltage is 220V.
Therefore, under the input of high voltage (larger than a first preset voltage), the output current of the full-voltage control circuit is a certain current value which is jointly output by the first constant-current converter and the second constant-current converter to drive the load to work, the effective current duty ratio of the first constant-current converter in one power grid period is p%, and the output current of the first constant-current converter is a current integral value in the p% duty ratio.
In the above formula (6), P2 is the output power of the full-voltage control circuit in the period T2, and T2 is the on time of the first constant current converter.
The effective current duty ratio of the second constant current converter in one power grid period is q%, and the output current of the second constant current converter in one power grid period is as follows:
IOUT2＝(Vrext2R2)*q％ (7)
then in equation (7) above, V rext2 is the internal reference voltage of the second constant current converter.
The full-voltage control circuit outputs power P3 under high-voltage input, wherein the calculation formula of P3 is as follows:
In the above formula (8), P3 is the output power of the full-voltage control circuit in the T3 period; when the first end of the fourth resistor R4 is connected with direct current, the direct current is divided by the fourth resistor R4 and the fifth resistor R5 to output detection voltage by utilizing the voltage division effect between the fourth resistor R4 and the fifth resistor R5; the amplitude of the detection voltage and the amplitude of the direct current have a one-to-one correspondence, and the duty ratio of working currents output by the first constant current converter and the second constant current converter can be changed through the resistance ratio between the fourth resistor R4 and the fifth resistor R5, so that the output power of the full-voltage control circuit has higher stability; an accurate voltage sampling function is achieved for the direct current by the detection module 102.
When the amplitude of the alternating current changes, the working currents output by the first constant current converter and the second constant current converter have different amplitudes under the control of the first resistor R1 and the second resistor R2 so as to maintain the working stability of the load; although the amplitude of the input power supply fluctuates greatly, the load 20 can be always connected with stable power by adjusting the resistance values of the first resistor R1 and the second resistor R2 to respectively carry out self-adaptive adjustment on the amplitude of working current, so that the load 20 is prevented from receiving the impact of the deterioration of external alternating current; the working safety of the load can be timely guaranteed in the embodiment.
Referring to fig. 6, the voltages at the external resistor end of the first constant current converter and the external resistor end of the second constant current converter are fixed values, and the resistance values of the first resistor R1 and the second resistor R2 and the resistance values of the fourth resistor R4 and the fifth resistor R5 are adjusted, so that the output power P1 of the full-voltage control circuit under the input of low voltage (120V) is equal to the output power P3 of the full-voltage control circuit under the input of high voltage (220V), the output powers of the full-voltage control circuit under the input of low voltage (120V) and high voltage (220V) are basically consistent, and the full-voltage control circuit has a certain output power P2 in the intermediate state (for example, 150V) in the high-low voltage range.
Various embodiments are described herein for various devices, circuits, apparatuses, systems and/or methods. Numerous specific details are set forth to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and shown in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the specification. It will be appreciated by persons skilled in the art that the embodiments described and illustrated herein are non-limiting examples, and thus it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
Reference throughout this specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic shown or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without assuming that such combination is not an undue or non-functional limitation. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above …, below …, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the embodiments.
Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Connection references (e.g., attached, coupled, connected, etc.) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, a connective reference does not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be construed broadly and used to provide non-limiting examples of embodiments of the present disclosure, and the present disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from this disclosure.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A full voltage control circuit coupled to a load, the full voltage control circuit comprising: the device comprises a rectifying module, a detecting module, a first capacitor, a first resistor, a second resistor, a first constant current converter, a second constant current converter, a first diode and a second diode;
the rectification module is connected with an alternating current power supply and used for converting alternating current output by the alternating current power supply into direct current; the direct currents have different magnitudes, and the magnitudes of the direct currents are changed along with the magnitudes of the alternating currents;
The detection module is connected with the rectification module and is used for detecting the amplitude of the direct current and generating detection voltage;
The current input end of the first constant current converter and the first end of the first capacitor are connected with the rectifying module;
the detection end of the first constant current converter is connected with the detection module;
The external resistor end of the first constant current converter is connected with the first end of the first resistor, the second end of the first resistor and the first end of the second resistor are connected with the external resistor end of the second constant current converter, and the second end of the second resistor, the grounding end of the first constant current converter and the grounding end of the second constant current converter are connected with the first end of the load;
The current input end of the second constant current converter is connected with the cathode of the first diode, the second end of the first capacitor and the anode of the first diode are connected with the cathode of the second diode, and the anode of the second diode and the second end of the load are grounded.
2. The full voltage control circuit of claim 1, wherein the rectifier module comprises a third resistor and a rectifier bridge;
The first end of the third resistor is connected with the anode of the alternating current power supply, the first end of the third resistor is connected with the anode input end of the rectifier bridge, the cathode input end of the rectifier bridge is connected with the cathode of the alternating current power supply, the cathode output end of the rectifier bridge is grounded, and the anode output end of the rectifier bridge is connected with the detection module.
3. The full voltage control circuit of claim 1, wherein the detection module comprises: a fourth resistor and a fifth resistor;
The first end of the fourth resistor is connected with the rectifying module, the second end of the fourth resistor and the first end of the fifth resistor are connected with the detection end of the first constant current converter in a sharing mode, and the second end of the fifth resistor is connected with the load.
4. The full-voltage control circuit of claim 1, wherein when the detected voltage is less than a first preset voltage, a first constant-current converter generates a first constant-current power supply according to the direct current, and the first constant-current power supply flows through the first resistor and the second resistor to supply power to the load.
5. The full-voltage control circuit of claim 4, wherein when the detected voltage is less than a second preset voltage and the second preset voltage is less than the first preset voltage, the first constant current converter generates the current of the first constant current power supply according to the following equation:
IOUT1＝Vrext1/RD
The I OUT1 is the current of a first constant current power supply, the V rext1 is the internal reference voltage of the first constant current converter, and the R D is the sum of the resistance value of the first resistor and the resistance value of the second resistor.
6. The full-voltage control circuit of claim 5, wherein when the detected voltage is greater than or equal to the second preset voltage and less than the first preset voltage, the first constant current converter generates the current of the first constant current power supply according to the following equation:
IOUT1＝(Vrext1-(VVT-Uvt)*Vrext1)/RD
In the above formula, V VT is the voltage compared with the internal detection port of the first constant current converter, and U VT is the voltage of the detection port of the first constant current converter.
7. The full-voltage control circuit according to claim 4, wherein when the detection voltage is greater than or equal to a first preset voltage, the second constant-current converter generates a second constant-current power supply from the direct current flowing in through the first capacitor and the first diode, and the first constant-current converter generates a third constant-current power supply from the direct current, the second constant-current power supply flowing through the second resistor to supply power to the load, and the third constant-current power supply flowing through the first resistor and the second resistor to supply power to the load.
8. The full voltage control circuit of claim 7 wherein the second constant current converter generates the current of the second constant current power supply according to the following equation:
IOUT2＝Vrext2/R2
In the above formula, the I OUT2 is the current of the second constant current power supply, the V rext2 is the internal reference voltage of the second constant current converter, and the R 2 is the resistance value of the second resistor;
The first constant current converter generates the current of the third constant current power supply according to the following formula:
IOUT3＝(Vrext1-(VVT-Uvt)*Vrext1)/RD
The current of the third constant current power supply is I OUT3, the sum of the resistance value of the first resistor and the resistance value of the second resistor is R D, the internal reference voltage of the first constant current converter is V rext1, the voltage of the detection end of the first constant current converter is U VT, and the internal detection port comparison voltage of the first constant current converter is V VT.
9. The full-voltage control circuit of claim 1, wherein the first constant-current converter comprises: an internal reference voltage source, a first comparator, a second comparator, a first controlled current source, a second controlled current source, a first switching tube, a second switching tube, a sixth resistor and a seventh resistor;
The first input end of the first comparator is the detection end of the first constant current converter, the voltage control end of the first controlled current source is connected with a first direct current power supply, the voltage control end of the second controlled current source is connected with a second direct current power supply, the first current output end of the first controlled current source, the second current output end of the first controlled current source and the first current output end of the second controlled current source are connected with the first conducting end of the first switching tube in a sharing mode, and the output end of the first comparator is connected with the control end of the first switching tube;
The second conducting end of the first switch tube and the second input end of the first comparator are connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the first end of the internal reference voltage source, and the second end of the internal reference voltage source is the grounding end of the first constant current converter;
The first input end of the second comparator is connected with a preset voltage, the second current output end of the second controlled current source and the first end of the seventh resistor are connected with the second input end of the second comparator, the output end of the second comparator is connected with the control end of the second switching tube, and the first conduction end of the second switching tube is the current input end of the first constant current converter;
the second conducting end of the second switching tube and the second end of the seventh resistor jointly form an external resistor end of the first constant current converter.
10. The full-voltage control circuit of claim 1, wherein the second constant-current converter comprises: a third comparator and a third switching tube;
the first input end of the third comparator is connected with a preset voltage, the output end of the third comparator is connected with the control end of the third switching tube, and the first conduction end of the third switching tube is the current input end of the second constant current converter;
The second input end of the third comparator and the second conducting end of the third switching tube jointly form an external resistor end of the second constant current converter.
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