CN116009636A - Voltage-controlled constant current source driving circuit - Google Patents
Voltage-controlled constant current source driving circuit Download PDFInfo
- Publication number
- CN116009636A CN116009636A CN202310032713.5A CN202310032713A CN116009636A CN 116009636 A CN116009636 A CN 116009636A CN 202310032713 A CN202310032713 A CN 202310032713A CN 116009636 A CN116009636 A CN 116009636A
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- resistor
- constant current
- current source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The application discloses a voltage-controlled constant current source drive circuit. The circuit comprises: a comparison output circuit for outputting a first pulse signal according to a comparison result of the first input signal and the second input signal; a switching circuit for turning on or off according to the level of the first pulse signal; the current sampling circuit is used for generating a first current and outputting a first voltage according to the on or off frequency of the switching circuit; the voltage amplifying circuit is used for amplifying the first voltage to generate a second voltage output; the digital-to-analog conversion circuit is used for generating analog voltage signal output; and the feedback circuit is used for generating a differential mode voltage of the analog voltage signal and the second voltage, and integrating the differential mode voltage to generate a second input signal. The voltage-controlled constant current source driving circuit improves error precision, expands output power, and solves the technical problems that when the conventional constant current source circuit is applied to a low-voltage constant current occasion, error is large and constant current output by the conventional constant current source circuit is small.
Description
Technical Field
The application belongs to the technical field of constant current source circuits, and relates to a voltage-controlled constant current source driving circuit.
Background
The existing constant current source circuit generally comprises a constant current source circuit formed by a transistor and a constant current source circuit formed by an integrated operational amplifier, wherein the existing constant current source circuit formed by the transistor can cause relatively larger error when the constant current source circuit is applied to low-voltage constant current because the interelectrode equivalent resistance of the collector and the emitter of the transistor is more than dozens of kiloohms; the constant current source circuit formed by the integrated operational amplifier is limited by the saturation voltage and current of the operational amplifier in the circuit, so that the form current of the operational amplifier loop of the constant current source circuit cannot be too large, and finally the constant current output by the circuit is small.
Disclosure of Invention
In view of the above, the present application provides a voltage-controlled constant current source driving circuit to solve the above technical problems.
In order to solve the technical problems, the technical scheme of the application is as follows:
the application provides a voltage-controlled constant current source drive circuit, include:
the comparison output circuit is used for receiving a first input signal and a second input signal and outputting a first pulse signal according to the comparison result of the first input signal and the second input signal;
the switching circuit is used for receiving the first pulse signal and is switched on or off according to the level of the first pulse signal;
the current sampling circuit is used for generating a first current and outputting a first voltage according to the on-off frequency of the switching circuit;
the voltage amplifying circuit is used for receiving the first voltage, amplifying the first voltage and then generating a second voltage output;
the digital-to-analog conversion circuit is used for generating an analog voltage signal output, and the analog voltage signal is used for controlling the magnitude of the first current;
and the feedback circuit is used for receiving the analog voltage signal and the second voltage, generating a differential mode voltage of the analog voltage signal and the second voltage, and integrating the differential mode voltage to generate a second input signal.
Further, the voltage-controlled constant current source driving circuit further comprises an isolated power supply module;
the input end of the isolated gate driver is connected with the comparison output circuit, the output end of the isolated gate driver is connected with the switch circuit, and the isolated gate driver is used for isolating a first power supply connected with the comparison output circuit from a second power supply connected with the switch circuit and driving the switch circuit to be turned on or off according to a first pulse signal output by the comparison output circuit.
Further, the voltage-controlled constant current source driving circuit further comprises a first chip and a sawtooth wave generating circuit;
the first chip is used for outputting square waves with set frequency;
the sawtooth wave generating circuit is used for receiving the square wave and outputting the first input signal with the same frequency as the square wave.
Further, the sawtooth wave generating circuit comprises a first triode, a first capacitor, a first resistor and a clamping diode;
the base of the first triode is connected with the first chip, the emitter of the first triode is connected with the first end of the first capacitor and the anode of the clamping diode respectively, the collector of the first triode is connected with the second end of the first capacitor, the first end of the first resistor, the cathode of the clamping diode and the comparison output circuit respectively, the first end of the first capacitor is further connected with the ground, and the second end of the first resistor is connected with a first power supply.
Further, the comparison output circuit includes a first comparator;
the non-inverting input end of the first comparator is connected with the sawtooth wave generating circuit, the inverting input end of the first comparator is connected with the feedback circuit, and the output end of the first comparator is connected with the isolated gate driver.
Further, the switching circuit comprises a first MOS tube;
the grid electrode of the first MOS tube is connected with the isolated grid electrode driver, the source electrode of the first MOS tube is connected with the current sampling circuit, and the drain electrode of the first MOS tube is used for being connected with a second power supply.
Further, the current sampling circuit comprises a freewheeling diode, a first inductor, a second capacitor, a second resistor and a sampling resistor;
the cathode of the free-wheeling diode is connected with the switch circuit and the first end of the first inductor respectively, the anode of the free-wheeling diode is used for being grounded, the second end of the first inductor is connected with the first end of the second capacitor and the first end of the second resistor respectively, the second end of the second capacitor and the second end of the second resistor are connected with the first end of the sampling resistor, the first end of the sampling resistor is also connected with the voltage amplifying circuit, and the second end of the sampling resistor is used for being grounded.
Further, the voltage amplifying circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and a first operational amplifier;
the two ends of the third resistor are respectively connected with the non-inverting input end of the first operational amplifier and the first end of the fourth resistor, the two ends of the fifth resistor are respectively connected with the inverting input end of the first operational amplifier and the second end of the fourth resistor, and the second end of the fourth resistor is also connected with the current sampling circuit;
the first end of the sixth resistor is connected with the non-inverting input end of the first operational amplifier, and the second end of the sixth resistor is used for being grounded;
and two ends of the seventh resistor are respectively connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier, and the output end of the operational amplifier is also connected with the feedback circuit.
Further, the feedback circuit comprises a second operational amplifier, an eighth resistor, a ninth resistor and a third capacitor;
the non-inverting input end of the second operational amplifier is connected with the voltage amplifying circuit, the inverting input end of the second operational amplifier is respectively connected with the eighth resistor and the second capacitor, the output end of the second operational amplifier is connected with the ninth resistor, the ninth resistor is also connected with the second capacitor, and the eighth resistor is also used for being connected with the digital-to-analog conversion circuit.
Further, the digital-to-analog conversion circuit comprises a digital-to-analog converter, and the digital-to-analog converter is connected with the feedback circuit.
Compared with the prior art, the beneficial effect of this application:
according to the voltage-controlled constant current source driving circuit, the switching circuit is controlled to be switched on and off by comparing the pulse signals output by the output circuit, when the frequency of switching circuit on or off is fixed, the current sampling circuit generates first current and error voltage in the circuit, namely first voltage, the error voltage is amplified by the voltage amplifying circuit to generate second voltage, the second voltage is input to the feedback circuit, the feedback circuit receives analog voltage signals and the second voltage to eliminate the error voltage, and when the analog voltage signals are equal to the second voltage signals, the circuit reaches an equilibrium state. According to the voltage-controlled constant current source driving circuit, the error precision of the circuit is improved, and further, the voltage-controlled constant current source driving circuit is provided with the isolated gate driver to isolate the first power supply connected with the comparison output circuit from the second power supply connected with the switch circuit, so that the output power of the current sampling circuit is greatly expanded, and the problems that the error is large and the constant current output by the existing constant current source circuit is small when the existing constant current source circuit is applied to a low-voltage constant current occasion are solved; the voltage-controlled constant current source driving circuit provided by the embodiment of the application has the advantages of quick establishment time from feedback to balance, quick response function, high output precision, continuous and adjustable output in a certain interval and suitability for the requirements of various constant current circuits.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, 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 block diagram of a voltage-controlled constant current source driving circuit according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a voltage-controlled constant current source driving circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be understood that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein.
Fig. 1 is a block diagram of a voltage-controlled constant current source driving circuit according to an embodiment of the present application, and as shown in fig. 1, the voltage-controlled constant current source driving circuit according to an embodiment of the present application includes a comparison output circuit 101, a switch circuit 102, a current sampling circuit 103, a voltage amplifying circuit 104, a digital-to-analog conversion circuit 108, and a feedback circuit 105.
The comparison output circuit 101 is configured to receive the first input signal and the second input signal, and output a first pulse signal according to a comparison result of the first input signal and the second input signal; the first input signal is a sawtooth wave, the second input signal is output by the feedback circuit 105, and the first pulse signal is a PWM wave (pulse width modulation) generated by comparing the first input signal and the second input signal.
In some embodiments, as shown in fig. 1, the voltage-controlled constant current source driving circuit provided in the embodiments of the present application further includes a first chip 106 and a sawtooth wave generating circuit 107, where the first chip 106 is configured to output a square wave with a set frequency, that is, the frequency of the square wave output by the first chip 106 may be set according to the requirement of a circuit designer, and the frequency of the square wave is the switching period of the voltage-controlled constant current source driving circuit; the sawtooth wave generating circuit 107 is configured to receive a square wave and output a sawtooth wave having the same frequency as the square wave, i.e., a first input signal.
It should be clear that, in the voltage-controlled constant current source driving circuit provided in the embodiment of the present application, the first input signal is not limited to be generated by the first chip 106 and the sawtooth wave generating circuit 107, but may be replaced by other circuits that function identically to the first chip 106 and the sawtooth wave generating circuit 107 in the embodiment of the present application.
In some embodiments, as shown in fig. 1, the voltage-controlled constant current source driving circuit provided in the embodiments of the present application further includes an isolated gate driver 108, where an input end and an output end of the isolated gate driver 108 are respectively connected to the comparison output circuit 101 and the switch circuit 102, and are used for isolating a first power source VCC connected to the comparison output circuit from a second power source VDD connected to the switch circuit, and driving the switch circuit to be turned on or off according to a first pulse signal, where the first power source VCC connected to the comparison output circuit is a small power source of a control stage, and the second power source VDD connected to the switch circuit is a large power source of a power stage.
The switch circuit 102 is configured to receive the first pulse signal output by the comparison output circuit 101, and turn on or off according to the level of the first pulse signal; the first pulse signal is a PWM wave modulation signal, and the switching circuit 102102 is turned on when the received first pulse signal is at a high level and turned off when the received first pulse signal is at a low level; it should be clear that, in the embodiment of the present application, the switch circuit 102 is not limited to high-level on and low-level off, and the low-level on and high-level off of the switch circuit 102 can be realized by redesigning the switch circuit 102.
The current sampling circuit 103 is used for generating a first current and outputting a first voltage according to the on or off frequency of the switch circuit 102; the first current is a constant current provided by the voltage-controlled constant current source driving circuit provided by the embodiment of the application, and the first voltage is an error voltage of the circuit.
The voltage amplifying circuit 104 is configured to receive the first voltage, amplify the first voltage, generate a second voltage, and output the second voltage to the feedback circuit 105.
The feedback circuit 105 is configured to receive the analog voltage signal and the second voltage, generate a differential mode voltage of the analog voltage signal and the second voltage, and integrate the differential mode voltage to generate a second input signal, where the feedback circuit 105 is PID integration and is configured to eliminate an error voltage in the circuit, and when the voltage-controlled constant current source driving circuit provided in the embodiment of the present application is in an initial state, the feedback circuit 105 only receives the analog voltage signal.
Wherein the analog voltage signal is generated by digital-to-analog conversion circuit 108, a circuit designer or an application person determines a desired constant current value by setting the value of the analog voltage signal.
Fig. 2 is a schematic structural diagram of a voltage-controlled constant current source driving circuit according to an embodiment of the present application, as shown in fig. 2, in some embodiments, as shown in fig. 2, a sawtooth wave generating circuit 107 includes a first triode Q1, a first capacitor C1, a first resistor R1, and a clamping diode D1.
The base of the first triode Q1 is connected with the first chip 106, the emitter of the first triode Q1 is connected with the first end of the first capacitor C1 and the anode of the clamping diode D1 respectively, the collector of the first triode Q1 is connected with the second end of the first capacitor C1 and the first end of the first resistor R1 respectively, the cathode of the clamping diode D1 is connected with the comparison output circuit 101, the first end of the first capacitor C1 is also used for being grounded, and the second end of the first resistor R1 is used for being connected with a first power supply.
The sawtooth wave generating circuit 107 receives the square wave signal generated by the first chip 106 to control the on and off of the first triode Q1, and forms a sawtooth wave signal with the same frequency as the square wave signal through the charge and discharge of the first resistor R1 and the first capacitor C1; when the first triode Q1 is cut off, the power supply charges the first capacitor C1 through the first resistor R1, the voltage of the first capacitor C1 is slowly raised, when the first triode Q1 is conducted, the first triode Q1 is equivalent to a conducting wire, the charge of the first capacitor C1 is rapidly discharged, and the voltage of the first capacitor C1 is approximately linearly lowered to form sawtooth waves.
The comparison output circuit 101 includes a first comparator A1, a non-inverting input terminal of the first comparator A1 is connected to the sawtooth wave generating circuit 107, and is configured to receive a first input signal output by the sawtooth wave generating circuit 107, an inverting input terminal of the first comparator A1 is connected to the feedback circuit 105, and is configured to receive a second input signal output by the feedback circuit 105, an output terminal of the first comparator A1 is connected to the isolated gate driver 108, and the isolated gate driver 108 outputs a first pulse signal to the switch circuit 102 to control the switch circuit 102 to be turned on or off; it should be clear that, as the common general knowledge in the art, the comparator includes positive voltage end and negative voltage end in addition to positive input end, inverting input end and output end, and positive voltage end is used for connecting positive voltage, and negative voltage end is used for connecting negative voltage or ground, and in this embodiment of the present application, positive voltage end of first comparator A1 is used for connecting first power VCC, and negative voltage end is used for ground.
The switch circuit 102 comprises a first MOS tube Q2, wherein a grid electrode of the first MOS tube Q2 is connected with the isolated grid driver 108 and is used for receiving a first pulse signal output by the comparison output circuit through the isolated grid driver 108, a source electrode of the first MOS tube Q2 is connected with the current sampling circuit 103, and a drain electrode of the first MOS tube Q2 is used for being connected with the second power supply VDD; it should be clear that, in the embodiment of the present application, the N-channel MOS transistor is set as the circuit switch, but the P-channel MOS transistor may still be set as the circuit switch through the circuit design.
The current sampling circuit 103 includes a flywheel diode D2, a first inductance L1, a second capacitance C2, a second resistance R2, and a sampling resistance Rm.
The cathode of the freewheeling diode D2 is connected with the switch circuit 102 and the first end of the first inductor L1 respectively, the anode of the freewheeling diode D2 is used for grounding, the second end of the first inductor L1 is connected with the first end of the second capacitor C2 and the first end of the second resistor R2 respectively, the second end of the second capacitor C2 and the second end of the second resistor R2 are both connected with the first end of the sampling resistor Rm, the first end of the sampling resistor Rm is also connected with the voltage amplifying circuit 104, and the second end of the sampling resistor Rm is used for grounding.
According to the voltage-controlled constant current source driving circuit, when the first pulse signal is at the low level, the first MOS tube Q2 is cut off, at the moment, the first inductor L1 of the current sampling circuit 103 is grounded through the second resistor R2 and the sampling resistor Rm and is reflowed to the first end of the first inductor L1 through the freewheel diode D2, and when the frequency of the first MOS tube Q2 on or cut off and the pulse width of the first pulse signal are properly set, the current sampling circuit 103 can output a constant current value, namely the first circuit. Meanwhile, when the first current flows through the sampling resistor Rm, a sampling voltage value, namely a first voltage, is formed on the sampling resistor Rm, and the first voltage is an error voltage.
The voltage amplifying circuit 104 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a first operational amplifier W1.
The two ends of the third resistor R3 are respectively connected with the non-inverting input end of the first operational amplifier W1 and the first end of the fourth resistor R4, the two ends of the fifth resistor R5 are respectively connected with the inverting input end of the first operational amplifier W1 and the second end of the fourth resistor R4, and the second end of the fourth resistor R4 is also connected with the current sampling circuit 103.
The first end of the sixth resistor R6 is connected to the non-inverting input terminal of the first operational amplifier W1, and the second end of the sixth resistor R6 is grounded.
Both ends of the seventh resistor R7 are connected to the inverting input terminal of the first operational amplifier W1 and the output terminal of the first operational amplifier W1, respectively, and the output terminal of the operational amplifier is also connected to the feedback circuit 105.
The feedback circuit 105 includes a second operational amplifier W2, an eighth resistor R8, a ninth resistor R9, and a third capacitor C3.
The non-inverting input terminal of the second operational amplifier W2 is connected to the voltage amplifying circuit 104, the inverting input terminal of the second operational amplifier W2 is connected to the eighth resistor R8 and the second capacitor C2, the output terminal of the second operational amplifier W2 is connected to the ninth resistor R9, the ninth resistor R9 is further connected to the second capacitor C2, and the eighth resistor R8 is further connected to the digital-to-analog conversion circuit 108.
The voltage amplifying circuit 104 amplifies the first voltage and outputs the amplified first voltage to the feedback circuit 105, the inverting input terminal of the feedback circuit 105 receives the analog voltage signal and the voltage difference is the analog voltage, the feedback circuit 105 is a PID integrating loop, when the first voltage is equal to the analog voltage signal, that is, when the circuit is balanced, the second input signal output by the feedback circuit 105 will be a constant value, and when the second input signal is constant, the first pulse signal output by the comparison output circuit 101 with the first input signal will be determined, and at this time, the first current output by the circuit is constant.
It should be clear that, as the common general knowledge in the art, the operational amplifier includes a positive voltage end and a negative voltage end in addition to a positive phase input end, an inverse phase input end and an output end, the positive voltage end is used for connecting a positive voltage, the negative voltage end is used for connecting a negative voltage or grounding, in this embodiment, the positive voltage end of the first operational amplifier W1 and the second operational amplifier W2 is used for connecting the first power VCC, and the negative voltage end is used for grounding.
The analog voltage signal is generated by the digital-to-analog conversion circuit 108, and the digital-to-analog conversion circuit 108 includes a digital-to-analog converter, converts the digital voltage signal to be converted into an analog voltage signal, and outputs the analog voltage signal to the feedback circuit 105.
According to the voltage-controlled constant current source driving circuit, the first inductance is arranged in the current sampling circuit to balance and store current, and error voltage in the circuit is a small potential suspended between the low potential of the second resistor in the current sampling circuit and ground; even if the current is hundred amperes, the current can be directly connected with the feedback circuit through the voltage amplifying circuit after passing through the smaller potential, so that the problem that the operational amplifier cannot output large current due to the limitation of saturated voltage and current is solved, the output power of the constant current source driving circuit is widened, and the problems that the error is large and the constant current output by the conventional constant current source circuit is small when the conventional constant current source circuit is applied to a low-voltage constant current occasion are solved; the voltage-controlled constant current source driving circuit provided by the embodiment of the application has the advantages of quick establishment time from feedback to balance, quick response function, high output precision, continuous and adjustable output in a certain interval and suitability for the requirements of various constant current circuits.
The foregoing is a further detailed description of the present application in connection with the specific embodiments, and it is not intended that the practice of the present application be limited to such descriptions. It should be understood by those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the present application, and the present application is not limited to the above-mentioned embodiments.
Claims (10)
1. A voltage controlled constant current source driving circuit, comprising:
the comparison output circuit is used for receiving a first input signal and a second input signal and outputting a first pulse signal according to the comparison result of the first input signal and the second input signal;
the switching circuit is used for receiving the first pulse signal and is switched on or off according to the level of the first pulse signal;
the current sampling circuit is used for generating a first current and outputting a first voltage according to the on-off frequency of the switching circuit;
the voltage amplifying circuit is used for receiving the first voltage, amplifying the first voltage and then generating a second voltage output;
the digital-to-analog conversion circuit is used for generating an analog voltage signal output, and the analog voltage signal is used for controlling the magnitude of the first current;
and the feedback circuit is used for receiving the analog voltage signal and the second voltage, generating a differential mode voltage of the analog voltage signal and the second voltage, and integrating the differential mode voltage to generate a second input signal.
2. The voltage controlled constant current source drive circuit according to claim 1, further comprising an isolated gate driver;
the input end of the isolated gate driver is connected with the comparison output circuit, the output end of the isolated gate driver is connected with the switch circuit, and the isolated gate driver is used for isolating a first power supply connected with the comparison output circuit from a second power supply connected with the switch circuit and driving the switch circuit to be turned on or off according to a first pulse signal output by the comparison output circuit.
3. The voltage controlled constant current source driving circuit according to claim 2, further comprising a first chip and a sawtooth wave generating circuit;
the first chip is used for outputting square waves with set frequency;
the sawtooth wave generating circuit is used for receiving the square wave and outputting the first input signal with the same frequency as the square wave.
4. The voltage controlled constant current source driving circuit according to claim 3, wherein the sawtooth wave generating circuit comprises a first triode, a first capacitor, a first resistor and a clamping diode;
the base of the first triode is connected with the first chip, the emitter of the first triode is connected with the first end of the first capacitor and the anode of the clamping diode respectively, the collector of the first triode is connected with the second end of the first capacitor, the first end of the first resistor, the cathode of the clamping diode and the comparison output circuit respectively, the first end of the first capacitor is further connected with the ground, and the second end of the first resistor is connected with a first power supply.
5. The voltage controlled constant current source drive circuit according to claim 3, wherein said comparison output circuit comprises a first comparator;
the non-inverting input end of the first comparator is connected with the sawtooth wave generating circuit, the inverting input end of the first comparator is connected with the feedback circuit, and the output end of the first comparator is connected with the isolated gate driver.
6. The voltage controlled constant current source driving circuit according to claim 3, wherein the switching circuit comprises a first MOS transistor;
the grid electrode of the first MOS tube is connected with the isolated grid electrode driver, the source electrode of the first MOS tube is connected with the current sampling circuit, and the drain electrode of the first MOS tube is used for being connected with a second power supply.
7. The voltage controlled constant current source drive circuit according to claim 3, wherein the current sampling circuit comprises a freewheeling diode, a first inductor, a second capacitor, a second resistor, and a sampling resistor;
the cathode of the free-wheeling diode is connected with the switch circuit and the first end of the first inductor respectively, the anode of the free-wheeling diode is used for being grounded, the second end of the first inductor is connected with the first end of the second capacitor and the first end of the second resistor respectively, the second end of the second capacitor and the second end of the second resistor are connected with the first end of the sampling resistor, the first end of the sampling resistor is also connected with the voltage amplifying circuit, and the second end of the sampling resistor is used for being grounded.
8. The voltage controlled constant current source driving circuit according to claim 3, wherein the voltage amplifying circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a first operational amplifier;
the two ends of the third resistor are respectively connected with the non-inverting input end of the first operational amplifier and the first end of the fourth resistor, the two ends of the fifth resistor are respectively connected with the inverting input end of the first operational amplifier and the second end of the fourth resistor, and the second end of the fourth resistor is also connected with the current sampling circuit;
the first end of the sixth resistor is connected with the non-inverting input end of the first operational amplifier, and the second end of the sixth resistor is used for being grounded;
and two ends of the seventh resistor are respectively connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier, and the output end of the operational amplifier is also connected with the feedback circuit.
9. The voltage controlled constant current source drive circuit according to claim 3, wherein the feedback circuit comprises a second operational amplifier, an eighth resistor, a ninth resistor, and a third capacitor;
the non-inverting input end of the second operational amplifier is connected with the voltage amplifying circuit, the inverting input end of the second operational amplifier is respectively connected with the eighth resistor and the second capacitor, the output end of the second operational amplifier is connected with the ninth resistor, the ninth resistor is also connected with the second capacitor, and the eighth resistor is also used for being connected with the digital-to-analog conversion circuit.
10. The voltage controlled constant current source drive circuit according to claim 3, wherein said digital-to-analog conversion circuit comprises a digital-to-analog converter, said digital-to-analog converter being coupled to said feedback circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310032713.5A CN116009636A (en) | 2023-01-10 | 2023-01-10 | Voltage-controlled constant current source driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310032713.5A CN116009636A (en) | 2023-01-10 | 2023-01-10 | Voltage-controlled constant current source driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116009636A true CN116009636A (en) | 2023-04-25 |
Family
ID=86020980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310032713.5A Pending CN116009636A (en) | 2023-01-10 | 2023-01-10 | Voltage-controlled constant current source driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116009636A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116794109A (en) * | 2023-08-25 | 2023-09-22 | 中国环境科学研究院 | Soil restoration monitoring system |
-
2023
- 2023-01-10 CN CN202310032713.5A patent/CN116009636A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116794109A (en) * | 2023-08-25 | 2023-09-22 | 中国环境科学研究院 | Soil restoration monitoring system |
| CN116794109B (en) * | 2023-08-25 | 2023-11-21 | 中国环境科学研究院 | Soil restoration monitoring system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9231570B2 (en) | Fast voltage level shifter circuit | |
| US7151406B2 (en) | Compensation of nonlinearity introduced by dead time in switching output stage | |
| CN106787626B (en) | Slope compensation circuit and power conversion device | |
| US10505504B2 (en) | Class D amplifier | |
| US8773091B2 (en) | Dead time modulation technique for the improvement of power conversion efficiency | |
| EP3580840B1 (en) | Voltage-based auto-correction of switching time | |
| CN116009636A (en) | Voltage-controlled constant current source driving circuit | |
| CN112072898A (en) | NMOS power tube grid clamping driving module, driving circuit and switching power supply | |
| US10164531B2 (en) | Adaptive control method for generating non overlapping time in output devices | |
| CN109412397B (en) | Secondary ramp compensation circuit of pulse width modulation current mode switching power supply | |
| CN114726208B (en) | PWM control circuit of peak current mode buck converter | |
| US4706035A (en) | High efficiency amplifier having a bootstrap capacitor | |
| US6867574B2 (en) | Switch mode power supply and driving method for efficient RF amplification | |
| CN114938129B (en) | Self-adaptive high-linearity ramp compensation circuit | |
| CN116015061A (en) | Slope compensation circuit, method for generating ramp compensation signal and electronic chip | |
| CN116054592A (en) | DC converter with secondary control mode and control method thereof | |
| US10075076B1 (en) | Voltage converter with current steering | |
| JP2003235251A (en) | Switching regulator | |
| JP3871551B2 (en) | Voltage supply circuit | |
| JPH061974B2 (en) | DC-DC boost power supply | |
| CN112821733A (en) | Pulse width modulation control circuit, drive circuit and direct current converter | |
| US6903577B2 (en) | Delay circuit | |
| CN113206593B (en) | Starting module, switching power supply chip and system | |
| JPH10164385A (en) | Vertical output circuit | |
| US20240146197A1 (en) | Buck-boost converter and control method therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |