CN117394793A - Circuit structure with wide working frequency range - Google Patents
Circuit structure with wide working frequency range Download PDFInfo
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- CN117394793A CN117394793A CN202311660194.3A CN202311660194A CN117394793A CN 117394793 A CN117394793 A CN 117394793A CN 202311660194 A CN202311660194 A CN 202311660194A CN 117394793 A CN117394793 A CN 117394793A
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- 239000003990 capacitor Substances 0.000 claims abstract description 84
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
- H03B2201/02—Varying the frequency of the oscillations by electronic means
- H03B2201/025—Varying the frequency of the oscillations by electronic means the means being an electronic switch for switching in or out oscillator elements
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Abstract
The invention relates to the technical field of battery power supply, and discloses a circuit structure with a wide working frequency range. By designing the ratio of the resistance value of the second resistor to the first value in the oscillator circuit to be equal to the ratio of the capacitance value of the third capacitor to the second value, the oscillator circuit can ensure that the output waveform precision of the oscillator circuit is high no matter in a high-frequency state or a low-frequency state, the condition of waveform distortion can not occur, and the accuracy of the output working frequency of the oscillator circuit is improved, so that a circuit structure with a wide working frequency range is formed.
Description
Technical Field
The invention relates to the technical field of battery power supply, in particular to a circuit structure with a wide working frequency range.
Background
In the prior art, the battery charging circuit includes an integrated circuit control chip and a power main circuit, and in recent years, the battery charging circuit has been developed in a miniaturized direction, so in order to reduce the volume of the battery charging circuit, the operating frequency of the power main circuit needs to be increased, and in this case, the operating frequency of the integrated circuit control chip needs to be increased accordingly.
In the prior art, an integrated circuit control chip of a battery charging circuit has an oscillator base circuit (a triangular wave signal generating circuit of an oscillator) as shown in fig. 1, and the circuit controls on-off of a ninth switch S9 through a control signal, so as to generate a triangular wave signal at a point F, and finally, the triangular wave signal is compared with a constant voltage, so that a corresponding oscillator output signal is obtained for controlling the working frequency of the chip.
However, since the ninth switch S9 needs time to be turned on and has on-resistance, so that the actual discharging state of the fifth capacitor C5 is different from the ideal discharging state, when the battery charging circuit needs to operate in a high frequency state, the triangular wave signal generated at the F point is easily distorted, the error of the output operating frequency is increased, the output of the battery charging circuit is disturbed, the accuracy and reliability of the battery charging circuit are reduced, and the operating frequency range is limited.
Disclosure of Invention
In view of the above, the present invention provides a circuit structure with a wide operating frequency range, so as to solve the problem of small operating frequency range of the battery charging circuit.
In a first aspect, the present invention provides an oscillator circuit comprising: the switching circuit comprises a current source circuit, a switching circuit and a waveform output circuit, wherein a first end of the current source circuit is connected with an external power supply, a second end of the current source circuit is connected with the first end of the switching circuit, and a third end of the current source circuit is grounded; the second end of the switching circuit is connected with the first end of the waveform output circuit, the third end of the switching circuit is connected with an external power supply, and the fourth end of the switching circuit is grounded; the second end of the waveform output circuit is a voltage waveform output end, and the third end of the waveform output circuit is grounded;
the waveform output circuit comprises a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a first inverter, a second inverter, a third inverter and a fourth inverter, wherein the first end of the first capacitor is respectively connected with the input ends of the switch circuit and the first inverter, the second end of the first capacitor is respectively connected with the second end of the first resistor, the first end of the second resistor, the second end of the second capacitor and the first end of the third capacitor, the output end of the first inverter is connected with the input end of the second inverter, the output end of the second inverter is respectively connected with the first end of the first resistor, the first end of the second capacitor and the input end of the third inverter, the output end of the third inverter is respectively connected with the input ends of the switch circuit and the fourth inverter, the output end of the third inverter is a voltage output end, the output end of the fourth inverter is connected with the second end of the switch circuit, the second value of the second resistor and the second value of the second resistor are summed up, the value of the second resistor and the second value of the second resistor is calculated, and the value of the second resistor and the second value of the third resistor is calculated.
By designing the ratio of the resistance value of the second resistor to the first value to be equal to the ratio of the capacitance value of the third capacitor to the second value, the oscillator circuit can ensure that the output waveform precision is high no matter in a high-frequency state or a low-frequency state, the condition of waveform distortion can not occur, and the accuracy of the output working frequency of the oscillator circuit is improved, so that a circuit structure with a wide working frequency range is formed.
In an alternative embodiment, the current source circuit includes: a first current source, a third resistor, a fourth resistor, a first controllable current source, a second controllable current source, and a third controllable current source, wherein,
the first end of the third resistor is respectively connected with an external power supply, a control positive electrode of the first controllable current source, a current input end of the first controllable current source, a control positive electrode of the second controllable current source, a current input end of the second controllable current source and the switch circuit, the second end of the third resistor is respectively connected with an input end of the first current source, a control negative electrode of the first controllable current source and a control negative electrode of the second controllable current source, and the output end of the first current source is grounded; the current output end of the first controllable current source is respectively connected with the first end of the fourth resistor and the control positive electrode of the third controllable current source, and the second end of the fourth resistor is grounded; the current output end of the second controllable current source is connected with the switch circuit; the current input end of the third controllable current source is connected with the first end of the third resistor through the switch circuit, and the current output end of the third controllable current source and the control cathode of the third controllable current source are grounded.
In an alternative embodiment, the switching circuit includes: a first controllable switch, a second controllable switch, a third controllable switch, a fourth controllable switch, a fifth controllable switch and a sixth controllable switch, wherein,
the control anode of the first controllable switch and the current input end of the first controllable switch are connected with the first end of the third resistor, the control cathode of the first controllable switch is respectively connected with the control anode of the second controllable switch, the control cathode of the fourth controllable switch, the control anode of the fifth controllable switch and the output end of the fourth inverter, and the current output end of the first controllable switch is respectively connected with the current output end of the fifth controllable switch, the current output end of the sixth controllable switch and the current input end of the third controllable current source; the current input end of the second controllable switch is respectively connected with the current output end of the second controllable current source, the current input end of the third controllable switch and the current input end of the fourth controllable switch, and the current output end of the second controllable switch and the control negative electrode of the second controllable switch are grounded; the control positive electrode of the third controllable switch is connected with the output end of the third inverter, the control negative electrode of the third controllable switch is grounded, and the current output end of the third controllable switch is connected with the first end of the first capacitor; the control positive electrode of the fourth controllable switch is connected with an external power supply, and the current output end of the fourth controllable switch is connected with the first end of the first capacitor; the control cathode of the fifth controllable switch is grounded, and the current input end of the fifth controllable switch is connected with the first end of the first capacitor; the control positive electrode of the sixth controllable switch is connected with an external power supply, the current input end of the sixth controllable switch is connected with the first end of the first capacitor, and the control negative electrode of the sixth controllable switch is connected with the output end of the third inverter.
By arranging the third controllable switch and the fourth controllable switch to be connected in parallel, the fifth controllable switch and the sixth controllable switch are connected in parallel, so that the on-resistance of the switch is reduced, and the output response speed of the oscillator circuit is accelerated.
In an alternative embodiment, the oscillator circuit further comprises: and the third end of the trigger signal generating circuit is grounded, and the fourth end of the trigger signal generating circuit is a trigger signal waveform output end.
In addition to the above-described oscillator circuit, an oscillator that outputs a trigger signal can be obtained by adding the trigger signal generation circuit.
In an alternative embodiment, the trigger signal generating circuit includes: a fifth inverter, a seventh controllable switch, an eighth controllable switch, a fifth resistor, a fourth capacitor, a sixth inverter and a first and gate, wherein,
the input end of the fifth inverter is connected with the second end of the waveform output circuit, and the output end of the fifth inverter is respectively connected with the control negative electrode of the seventh controllable switch and the control positive electrode of the eighth controllable switch; the control anode of the seventh controllable switch and the current input end of the seventh controllable switch are connected with an external power supply, and the current output end of the seventh controllable switch is connected with the first end of the fifth resistor; the second end of the fifth resistor is respectively connected with the current input end of the eighth controllable switch, the first end of the fourth capacitor and the input end of the sixth inverter; the control negative electrode and the current output end of the eighth controllable switch are grounded; the second end of the fourth capacitor is grounded; the first input end of the first AND gate is connected with the output end of the sixth inverter, the second input end of the first AND gate is connected with the second end of the waveform output circuit, and the output end of the first AND gate is a trigger signal waveform output end.
Although the oscillator circuit has a process of charging and discharging the fourth capacitor, the oscillator circuit only obtains a trigger signal at the rising edge of the voltage waveform of the first output terminal. Therefore, in the high frequency state, since the eighth switch takes time to turn on, and there is on-resistance, there is a case where waveform distortion occurs. And because the first output end outputs the voltage waveform of the high-precision working frequency, the oscillator circuit can also output the trigger signal waveform of the high-precision working frequency no matter the circuit works in a high-frequency state or a low-frequency state, thereby forming a circuit structure of a wide working frequency range.
In an alternative embodiment, the waveform period of the oscillator circuit is:
wherein,the current ratio of the first controllable current source, the second controllable current source and the third controllable current source is 1:N:M, VDD is the external power supply voltage, and +.>Is the first resistance value->Is the resistance value of the second resistor,is the first capacitance.
In an alternative embodiment, the duty cycle of the oscillator circuit waveform is adjusted by controlling the ratio of the charge time and the discharge time of the first capacitor.
In an alternative embodiment, the ratio of the charge time to the discharge time of the first capacitor is controlled by adjusting the magnitudes of N and M.
In a second aspect, the present invention provides an integrated circuit control chip comprising an oscillator circuit according to the first aspect of the invention.
The integrated circuit control chip provided by the invention comprises the oscillator circuit in the first aspect, so that the working frequency range of the integrated circuit control chip is enlarged.
In a third aspect, the present invention provides a battery charging circuit comprising the integrated circuit control chip according to the second aspect of the present invention.
The battery charging circuit provided by the invention comprises the integrated circuit control chip of the oscillator circuit, so that the working frequency range of the battery charging circuit is enlarged, and the battery charging circuit forms a circuit structure with a wide working frequency range. Meanwhile, the reliability, the precision and the response speed of the battery charging circuit are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is an oscillator base circuit of a prior art battery charging circuit;
FIG. 2 is a schematic block diagram of an oscillator circuit in an embodiment of the invention;
FIG. 3 is a block diagram of an oscillator circuit in an embodiment of the invention;
FIG. 4 is a voltage waveform diagram of an embodiment of the present invention;
FIG. 5 is yet another functional block diagram of an oscillator circuit in an embodiment of the present invention;
FIG. 6 is a further block diagram of an oscillator circuit in an embodiment of the invention;
FIG. 7 is a waveform diagram of a trigger signal according to an embodiment of the present invention;
FIG. 8 is a block diagram of an integrated circuit control chip in an embodiment of the invention;
fig. 9 is a block diagram of a battery charging circuit in an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In order to improve the working frequency range of a battery charging circuit, the invention provides an oscillator circuit. As shown in fig. 2, the oscillator circuit includes: a current source circuit 1, a switching circuit 2, and a waveform output circuit 3.
As shown in fig. 2, a first terminal of the current source circuit 1 is connected to an external power source, a second terminal of the current source circuit 1 is connected to a first terminal of the switching circuit 2, and a third terminal of the current source circuit 1 is grounded. The second end of the switch circuit 2 is connected with the first end of the waveform output circuit 3, the third end of the switch circuit 2 is connected with an external power supply, and the fourth end of the switch circuit 2 is grounded. The second end of the waveform output circuit 3 is a voltage waveform output end, and the third end of the waveform output circuit 3 is grounded.
In a specific embodiment, as shown in fig. 3, the current source circuit 1 includes: the first current source I1, the third resistor R3, the fourth resistor R4, the first controllable current source G1, the second controllable current source G2 and the third controllable current source G3. A switching circuit 2 comprising: the first controllable switch S1, the second controllable switch S2, the third controllable switch S3, the fourth controllable switch S4, the fifth controllable switch S5 and the sixth controllable switch S6. The waveform output circuit 3 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a first inverter A1, a second inverter A2, a third inverter A3, and a fourth inverter A4.
In the current source circuit 1, a first end of a third resistor R3 is respectively connected with an external power supply, a control positive electrode of a first controllable current source G1, a current input end of the first controllable current source G1, a control positive electrode of a second controllable current source G2, a current input end of the second controllable current source G2 and the switch circuit 2, and a second end of the third resistor R3 is respectively connected with an input end of the first current source I1, a control negative electrode of the first controllable current source G1 and a control negative electrode of the second controllable current source G2, and an output end of the first current source I1 is grounded; the current output end of the first controllable current source G1 is respectively connected with the first end of the fourth resistor R4 and the control positive electrode of the third controllable current source G3, and the second end of the fourth resistor R4 is grounded; the current output end of the second controllable current source G2 is connected with the switch circuit 2; the current input end of the third controllable current source G3 is connected with the first end of the third resistor R3 through the switch circuit 2, and the current output end of the third controllable current source G3 and the control cathode of the third controllable current source G3 are grounded.
In the switch circuit 2, a control positive electrode of the first controllable switch S1 and a current input end of the first controllable switch S1 are connected with a first end of the third resistor R3, a control negative electrode of the first controllable switch S1 is respectively connected with a control positive electrode of the second controllable switch S2, a control negative electrode of the fourth controllable switch S4, a control positive electrode of the fifth controllable switch S5 and an output end of the fourth inverter A4, and a current output end of the first controllable switch S1 is respectively connected with a current output end of the fifth controllable switch S5, a current output end of the sixth controllable switch S6 and a current input end of the third controllable current source G3; the current input end of the second controllable switch S2 is respectively connected with the current output end of the second controllable current source G2, the current input end of the third controllable switch S3 and the current input end of the fourth controllable switch S4, and the current output end of the second controllable switch S2 and the control negative electrode of the second controllable switch S2 are grounded; the control positive electrode of the third controllable switch S3 is connected with the output end of the third inverter A3, the control negative electrode of the third controllable switch S3 is grounded, and the current output end of the third controllable switch S3 is connected with the first end of the first capacitor C1; the control positive electrode of the fourth controllable switch S4 is connected with an external power supply, and the current output end of the fourth controllable switch S4 is connected with the first end of the first capacitor C1; the control cathode of the fifth controllable switch S5 is grounded, and the current input end of the fifth controllable switch S5 is connected with the first end of the first capacitor C1; the control positive electrode of the sixth controllable switch S6 is connected with an external power supply, the current input end of the sixth controllable switch S6 is connected with the first end of the first capacitor C1, and the control negative electrode of the sixth controllable switch S6 is connected with the output end of the third inverter A3.
In the waveform output circuit 3, a first end of a first capacitor C1 is respectively connected with the input ends of a switch circuit 2 and a first inverter A1, a second end of the first capacitor C1 is respectively connected with a second end of a first resistor R1, a first end of a second resistor R2, a second end of a second capacitor C2 and a first end of a third capacitor C3, an output end of the first inverter A1 is connected with an input end of the second inverter A2, an output end of the second inverter A2 is respectively connected with a first end of the first resistor R1, a first end of the second capacitor C2 and an input end of the third inverter A3, an output end of the third inverter A3 is respectively connected with an input end of the switch circuit 2 and an input end of a fourth inverter A4, an output end of the fourth inverter A4 is connected with the switch circuit 2, a second end of the second resistor R2 and a second end of the third capacitor C3 are grounded, a value of the second resistor R1 and the second resistor C2 is summed with a second value of the third capacitor C3, and a value of the third capacitor C2 is summed up, and a value of the third capacitor C2 is calculated, and a value of the third capacitor C2 is obtained.
In an alternative embodiment, the oscillator circuit shown in fig. 3 operates as follows: after the circuit is powered on, the first current source I1 generates a first current I1'. Therefore, the third resistor R3 generates a first voltage across it, which turns on the first controllable current source G1 and the second controllable current source G2. At this time, a first controllable current is generated in the series branch composed of the first controllable current source G1 and the fourth resistor R4. Therefore, the second voltage is generated across the fourth resistor R4, and the second voltage turns on the third controllable current source G3.
Meanwhile, when the circuit is just powered on, voltages at two ends of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are all 0. That is, at this time, the C-point voltage is at a low level (the magnitude of this low level is GND). The voltage at point D obtained after the voltage at point C passes through the third inverter A3 is at high level. The voltage at point E obtained after the voltage at point D passes through the fourth inverter A4 is low. At this time, the first, third and fourth controllable switches S1, S3 and S4 are turned on, and the second, fifth and sixth controllable switches S2, S5 and S6 are turned off. Thus, a third controllable current is generated in the series branch of the first controllable switch S1 and the third controllable current source G3. The first capacitor C1 is charged by the second controllable current source G2, the third controllable switch S3 and the fourth controllable switch S4, and a second controllable current is generated in the series branch, and the voltage at the point a is continuously increased.
When the voltage at point a increases to the switching threshold voltage of the first inverter A1 (preferably) At this time, the first inverter A1 outputs a low level. That is, at this time, the point C voltage is at a high level (the high level is equal to the external power supply voltage VDD of the inverter), and the point D voltage obtained after the point C voltage passes through the third inverter A3 is at a low level. The voltage at point E obtained after the voltage at point D passes through the fourth inverter A4 is a high level. At this time, the first, third and fourth controllable switches S1, S3 and S4 are turned off, and the second controllable switch S2 is turned onThe fifth controllable switch S5 and the sixth controllable switch S6 are turned on. Therefore, the second controllable current is generated in the series branch consisting of the second controllable switch S2 and the second controllable current source G2, the first capacitor C1 is discharged through the third controllable current source G3, the fifth controllable switch S5 and the sixth controllable switch S6, the third controllable current is generated in the series branch, and the voltage at the point a is continuously reduced.
When the voltage at point a decreases to the switching threshold voltage of the first inverter A1 (preferably) At this time, the first inverter A1 outputs a high level, and the circuit enters the next cycle.
From the above analysis, when the voltage at the point A increases to the switching threshold voltage of the first inverter A1 (preferably) At this time, the point C voltage becomes a high level (the high level is equal in magnitude to the external power supply voltage VDD of the inverter). At this time, the B-point voltage is instantaneously stepped intoOr->Wherein->Is the resistance value of the first resistor R1, < >>Is the resistance value of the second resistor R2, < >>Is the capacitance of the second capacitor C2, < >>Is the capacitance of the third capacitor C3. Specifically, when the circuit is operated in the low frequency state, the C point voltage passes through the first resistor R1 and the second resistorThe resistor R2 is divided to obtain a point B voltage, and the second capacitor C2 and the third capacitor C3 are used for improving the step response of the point B voltage; when the circuit works in a high-frequency state, the voltage at the point C is divided by the second capacitor C2 and the third capacitor C3 to obtain the voltage at the point B. And in this case, the voltage at the point B is the same in order to ensure that the circuit is operated in either the high frequency state or the low frequency state, so +.>Designed to be equal to->. By controlling the constant voltage of the point B, the oscillator circuit can be ensured to have high output waveform precision no matter in a high-frequency state or a low-frequency state, the condition of waveform distortion can not occur, and the accuracy of the output working frequency of the oscillator circuit is improved.
Therefore, when the voltage at the point A increases to the switching threshold voltage of the first inverter A1 (preferably) At this time, since the voltage at the point B is instantaneously stepped, the voltage at the point A is also increased by +.>Instantaneous step to +.>. After that, when the voltage at the point A is reduced to the switching threshold voltage of the first inverter A1 (preferably +.>) At this time, the C-point voltage becomes low level (GND). Therefore, the voltage at the point B is equal to +.>The momentary step is 0, so the voltage at point A is also made up of +.>Instantaneous step to. Then, under the action of the circuit, the voltage at the point A is continuously increased.
Meanwhile, as can be seen from the circuit structure, the voltage at the point D, i.e., the voltage at the first output terminal OUT1 is opposite to the voltage at the point C. At this time, when the voltage at the point A rises to the switching threshold voltage of the first inverter A1 (preferably) At this time, the voltage of the first output terminal OUT1 becomes a low level. When the voltage at the point A is reduced to the switching threshold voltage of the first inverter A1 (preferably +.>) At this time, the voltage of the first output terminal OUT1 becomes a high level.
Therefore, at this time, the voltage waveforms of the point a voltage, the point B voltage and the first output terminal OUT1 are obtained as shown in fig. 4. As can be seen from fig. 4, the voltage variation of the first capacitor C1 isThe charging current of the first capacitor C1 is equal to the second controllable current, and the discharging current of the first capacitor C1 is equal to the third controllable current. At this time, it is assumed that the current ratio of the first controllable current source G1, the second controllable current source G2 and the third controllable current source G3 is 1:n:m, and thus, the first controllable current is equal to the first current I1', and the second controllable current is equal to +>The third controllable current is equal to +.>Thereby the charging time of the first capacitor C1 is made +.>The discharge time of the first capacitor C1 is +.>. At this time, therefore, by controlling the charging time of the first capacitor C1And the ratio of the discharge time, the duty cycle of the oscillator circuit waveform is adjusted. Specifically, the current ratio N and M may be adjusted to control the ratio of the charging time and the discharging time of the first capacitor C1, thereby obtaining a preset duty ratio of the voltage waveform of the first output terminal OUT1, where the period of the voltage waveform of the first output terminal OUT1 is ∈>Wherein VDD is an external power supply voltage.
In the embodiment of the invention, when the voltage of the point B is controlled to be constant, the charging current and the discharging current of the first capacitor C1 are ensured to be in the completely controllable state through the second controllable current and the third controllable current, so that the waveform accuracy of the output of the oscillator circuit is further ensured to be high, and the condition of waveform distortion is avoided.
In an alternative embodiment, as can be seen from the analysis of the oscillator circuit in fig. 3, the third controllable switch S3 and the fourth controllable switch S4 are connected in parallel, and the fifth controllable switch S5 and the sixth controllable switch S6 are connected in parallel, so that the on-resistance of the switches is reduced, and the output response speed of the oscillator circuit is increased.
In an alternative embodiment, as shown in fig. 5, the oscillator circuit further includes: the trigger signal generating circuit 4, the first end of the trigger signal generating circuit 4 is connected with the second end of the waveform output circuit 3, the second end of the trigger signal generating circuit 4 is connected with an external power supply, the third end of the trigger signal generating circuit 4 is grounded, and the fourth end of the trigger signal generating circuit 4 is a trigger signal waveform output end.
In a specific embodiment, as shown in fig. 6, the trigger signal generating circuit 4 includes: a fifth inverter A5, a seventh controllable switch S7, an eighth controllable switch S8, a fifth resistor R5, a fourth capacitor C4, a sixth inverter A6, and a first and gate A7. The input end of the fifth inverter A5 is connected to the second end of the waveform output circuit 3, and the output end of the fifth inverter A5 is connected to the control negative electrode of the seventh controllable switch S7 and the control positive electrode of the eighth controllable switch S8, respectively. The control positive electrode of the seventh controllable switch S7 and the current input end of the seventh controllable switch S7 are both connected with an external power supply, and the current output end of the seventh controllable switch S7 is connected with the first end of the fifth resistor R5. The second end of the fifth resistor R5 is connected to the current input end of the eighth controllable switch S8, the first end of the fourth capacitor C4, and the input end of the sixth inverter A6, respectively. The control negative electrode and the current output end of the eighth controllable switch S8 are grounded. The second terminal of the fourth capacitor C4 is grounded. The first input end of the first and gate A7 is connected with the output end of the sixth inverter A6, the second input end of the first and gate A7 is connected with the second end of the waveform output circuit 3, and the output end of the first and gate A7 is the trigger signal waveform output end.
In the embodiment of the present invention, the oscillator for outputting the trigger signal can be obtained by adding the trigger signal generating circuit 4 described above on the basis of the oscillator circuit shown in fig. 3.
Specifically, the operating principle of the oscillator circuit shown in fig. 6 is as follows: when the D-point voltage is low, the fifth inverter A5 outputs a high level. At this time, the seventh controllable switch S7 is turned off, the eighth controllable switch S8 is turned on, and the fourth capacitor C4 is discharged to 0 through the eighth controllable switch S8. Meanwhile, since the D-point voltage of the low level is input into the first and gate A7, the first and gate A7 outputs a low level signal.
When the D-point voltage is at a high level, the fifth inverter A5 outputs a low level. At this time, the seventh controllable switch S7 is turned on, the eighth controllable switch S8 is turned off, and the power supply voltage VDD charges the fourth capacitor C4 through the seventh controllable switch S7 and the fifth resistor R5. When the voltage of the fourth capacitor C4 has not risen above the switching voltage threshold of the sixth inverter A6 (preferably) The sixth inverter A6 outputs a high level, and at the same time, since a high level D point voltage is input into the first and gate A7, the first and gate A7 outputs a high level signal. Thereafter, when the voltage of the fourth capacitor C4 increases to be greater than the switching voltage threshold of the sixth inverter A6 (preferably +.>) The sixth inverter A6 outputs a low level, so at this time,the first and gate A7 outputs a low level signal again. From the above analysis, a waveform diagram of the trigger signal of the second output terminal OUT2 can be obtained, as shown in fig. 7.
As can be seen from fig. 7, the waveform period of the trigger signal of the second output terminal OUT2 is also. As can be seen from fig. 6, the duty ratio of the waveform of the oscillator circuit is adjusted by controlling the ratio of the charge time and the discharge time of the first capacitor C1. Specifically, the current ratios N and M may be adjusted to control the ratio of the charging time and the discharging time of the first capacitor C1, thereby obtaining the preset duty ratio of the voltage waveform of the second output terminal OUT 2.
As can be seen from the above analysis of the oscillator circuit in fig. 6, although the oscillator circuit has a process of charging and discharging the fourth capacitor C4, the oscillator circuit only obtains a trigger signal at the rising edge of the voltage waveform of the first output terminal OUT 1. Therefore, in the absence of the high frequency state, since the eighth controllable switch S8 takes time to turn on, and there is on-resistance, there is a case where waveform distortion occurs. And since the first output terminal OUT1 outputs a voltage waveform of a high-precision operating frequency, the oscillator circuit shown in fig. 6 can output a trigger signal waveform of a high-precision operating frequency regardless of whether the circuit is operated in a high-frequency state or a low-frequency state.
As shown in fig. 8, the present invention also provides an integrated circuit control chip including the oscillator circuit shown in fig. 6.
In one embodiment, the integrated circuit control chip is shown in fig. 8, and includes an oscillator, a linear voltage regulator, a trigger B1, a built-in power switch Q1, and the like. The oscillator may have the circuit structure shown in fig. 6.
As shown in fig. 9, the present invention further provides a battery charging circuit, which includes the integrated circuit control chip shown in fig. 8.
In a specific embodiment, fig. 9 illustrates a battery charging circuit including the integrated circuit control chip U1 shown in fig. 8. The built-in power switch tube Q1, the power inductor L1 and the first diode D1 of the integrated circuit control chip U1 form a main power booster circuit of the battery charging circuit.
The battery charging circuit provided by the invention comprises the integrated circuit control chip with the oscillator circuit shown in fig. 6, so that the working frequency range of the battery charging circuit is enlarged, and the battery charging circuit forms a circuit structure with a wide working frequency range. Meanwhile, the reliability, the precision and the response speed of the battery charging circuit are improved.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (10)
1. An oscillator circuit, comprising: a current source circuit, a switching circuit and a waveform output circuit, wherein,
the first end of the current source circuit is connected with an external power supply, the second end of the current source circuit is connected with the first end of the switch circuit, and the third end of the current source circuit is grounded;
the second end of the switching circuit is connected with the first end of the waveform output circuit, the third end of the switching circuit is connected with an external power supply, and the fourth end of the switching circuit is grounded;
the second end of the waveform output circuit is a voltage waveform output end, and the third end of the waveform output circuit is grounded;
the waveform output circuit comprises a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a first inverter, a second inverter, a third inverter and a fourth inverter, wherein the first end of the first capacitor is respectively connected with the input ends of the switch circuit and the first inverter, the second end of the first capacitor is respectively connected with the second end of the first resistor, the first end of the second resistor, the second end of the second capacitor and the first end of the third capacitor, the output end of the first inverter is connected with the input end of the second inverter, the output end of the second inverter is respectively connected with the first end of the first resistor, the first end of the second capacitor and the input end of the third inverter, the output end of the third inverter is respectively connected with the input ends of the switch circuit and the fourth inverter, the output end of the third inverter is a voltage output end, the output end of the fourth inverter is connected with the second end of the switch circuit, the second value of the second resistor and the second value of the second resistor are summed up, the value of the second resistor and the second value of the second resistor is calculated, and the value of the second resistor and the second value of the third resistor is calculated.
2. The oscillator circuit of claim 1, wherein the current source circuit comprises: a first current source, a third resistor, a fourth resistor, a first controllable current source, a second controllable current source, and a third controllable current source, wherein,
the first end of the third resistor is respectively connected with an external power supply, a control positive electrode of the first controllable current source, a current input end of the first controllable current source, a control positive electrode of the second controllable current source, a current input end of the second controllable current source and the switch circuit, the second end of the third resistor is respectively connected with an input end of the first current source, a control negative electrode of the first controllable current source and a control negative electrode of the second controllable current source, and the output end of the first current source is grounded;
the current output end of the first controllable current source is respectively connected with the first end of the fourth resistor and the control positive electrode of the third controllable current source, and the second end of the fourth resistor is grounded;
the current output end of the second controllable current source is connected with the switch circuit;
the current input end of the third controllable current source is connected with the first end of the third resistor through the switch circuit, and the current output end of the third controllable current source and the control cathode of the third controllable current source are grounded.
3. The oscillator circuit of claim 2, wherein the switching circuit comprises: a first controllable switch, a second controllable switch, a third controllable switch, a fourth controllable switch, a fifth controllable switch and a sixth controllable switch, wherein,
the control anode of the first controllable switch and the current input end of the first controllable switch are connected with the first end of the third resistor, the control cathode of the first controllable switch is respectively connected with the control anode of the second controllable switch, the control cathode of the fourth controllable switch, the control anode of the fifth controllable switch and the output end of the fourth inverter, and the current output end of the first controllable switch is respectively connected with the current output end of the fifth controllable switch, the current output end of the sixth controllable switch and the current input end of the third controllable current source;
the current input end of the second controllable switch is respectively connected with the current output end of the second controllable current source, the current input end of the third controllable switch and the current input end of the fourth controllable switch, and the current output end of the second controllable switch and the control negative electrode of the second controllable switch are grounded;
the control positive electrode of the third controllable switch is connected with the output end of the third inverter, the control negative electrode of the third controllable switch is grounded, and the current output end of the third controllable switch is connected with the first end of the first capacitor;
the control positive electrode of the fourth controllable switch is connected with an external power supply, and the current output end of the fourth controllable switch is connected with the first end of the first capacitor;
the control cathode of the fifth controllable switch is grounded, and the current input end of the fifth controllable switch is connected with the first end of the first capacitor;
the control positive electrode of the sixth controllable switch is connected with an external power supply, the current input end of the sixth controllable switch is connected with the first end of the first capacitor, and the control negative electrode of the sixth controllable switch is connected with the output end of the third inverter.
4. The oscillator circuit of claim 3, wherein the oscillator circuit further comprises: and the third end of the trigger signal generating circuit is grounded, and the fourth end of the trigger signal generating circuit is a trigger signal waveform output end.
5. The oscillator circuit of claim 4, wherein the trigger signal generation circuit comprises: a fifth inverter, a seventh controllable switch, an eighth controllable switch, a fifth resistor, a fourth capacitor, a sixth inverter and a first and gate, wherein,
the input end of the fifth inverter is connected with the second end of the waveform output circuit, and the output end of the fifth inverter is respectively connected with the control negative electrode of the seventh controllable switch and the control positive electrode of the eighth controllable switch;
the control anode of the seventh controllable switch and the current input end of the seventh controllable switch are connected with an external power supply, and the current output end of the seventh controllable switch is connected with the first end of the fifth resistor;
the second end of the fifth resistor is respectively connected with the current input end of the eighth controllable switch, the first end of the fourth capacitor and the input end of the sixth inverter;
the control negative electrode and the current output end of the eighth controllable switch are grounded;
the second end of the fourth capacitor is grounded;
the first input end of the first AND gate is connected with the output end of the sixth inverter, the second input end of the first AND gate is connected with the second end of the waveform output circuit, and the output end of the first AND gate is a trigger signal waveform output end.
6. The oscillator circuit of claim 5, wherein the oscillator circuit has a waveform period of:
wherein,the current ratio of the first controllable current source, the second controllable current source and the third controllable current source is 1:N:M, VDD is the external power supply voltage, and +.>Is the first resistance value->Is the second resistance value->Is the first capacitance.
7. The oscillator circuit of claim 6, wherein the duty cycle of the oscillator circuit waveform is adjusted by controlling a ratio of a charge time and a discharge time of the first capacitor.
8. The oscillator circuit of claim 7, wherein the ratio of the charge time to the discharge time of the first capacitor is controlled by adjusting the magnitudes of N and M.
9. An integrated circuit control chip comprising an oscillator circuit as claimed in any one of claims 1 to 8.
10. A battery charging circuit comprising the integrated circuit control chip of claim 9.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118148A (en) * | 2009-12-31 | 2011-07-06 | 联芯科技有限公司 | Oscillator |
| CN202102045U (en) * | 2011-05-24 | 2012-01-04 | 中国长城计算机深圳股份有限公司 | Filter capacitor voltage tester |
| CN103840449A (en) * | 2012-11-26 | 2014-06-04 | 西安威正电子科技有限公司 | Filter capacitor series circuit capable of eliminating ESR influence |
| CN107508579A (en) * | 2017-08-23 | 2017-12-22 | 西北工业大学 | A kind of electric charge transfer RC relaxors |
| CN209200925U (en) * | 2018-10-23 | 2019-08-02 | 安徽四创电子股份有限公司 | A kind of titanium pump power supply of C-band klystron |
| WO2022142625A1 (en) * | 2020-12-30 | 2022-07-07 | 圣邦微电子（北京）股份有限公司 | Oscillator for switching converter, and switching converter |
| US20230246614A1 (en) * | 2022-02-01 | 2023-08-03 | Eliahu Friedmann | Single-ended to differential converter |
| CN117353431A (en) * | 2023-12-06 | 2024-01-05 | 苏州贝克微电子股份有限公司 | Circuit structure with adjustable duty ratio |
-
2023
- 2023-12-06 CN CN202311660194.3A patent/CN117394793B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118148A (en) * | 2009-12-31 | 2011-07-06 | 联芯科技有限公司 | Oscillator |
| CN202102045U (en) * | 2011-05-24 | 2012-01-04 | 中国长城计算机深圳股份有限公司 | Filter capacitor voltage tester |
| CN103840449A (en) * | 2012-11-26 | 2014-06-04 | 西安威正电子科技有限公司 | Filter capacitor series circuit capable of eliminating ESR influence |
| CN107508579A (en) * | 2017-08-23 | 2017-12-22 | 西北工业大学 | A kind of electric charge transfer RC relaxors |
| CN209200925U (en) * | 2018-10-23 | 2019-08-02 | 安徽四创电子股份有限公司 | A kind of titanium pump power supply of C-band klystron |
| WO2022142625A1 (en) * | 2020-12-30 | 2022-07-07 | 圣邦微电子（北京）股份有限公司 | Oscillator for switching converter, and switching converter |
| US20230246614A1 (en) * | 2022-02-01 | 2023-08-03 | Eliahu Friedmann | Single-ended to differential converter |
| CN117353431A (en) * | 2023-12-06 | 2024-01-05 | 苏州贝克微电子股份有限公司 | Circuit structure with adjustable duty ratio |
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