Boost circuit and control method thereof
阅读说明：本技术 升压电路及其控制方法 (Boost circuit and control method thereof ) 是由 张朋 邢瑞强 李计福 于 2019-11-04 设计创作，主要内容包括：本发明涉及一种升压电路及其控制方法,升压电路中,储能电容的第一端分别与输入电压的正极和升压电感的第一端连接,第二端分别与输入电压的负极和反向整流二极管的负极连接；升压电感的第二端与正向整流二极管的正极连接；正向整流二极管的负极与输出电压的正极连接；反向整流二极管的正极与输出电压的负极连接；正向整流二极管的正极作为第1个节点,反向整流二极管的负极作为第N+1个节点；第n个开关组件分别与第n个节点和第n+1个节点连接；第m个分压组件分别与第m个节点和第m+1个节点连接；第1个分压组件分别与输出电压的正极和第2个节点连接；第N个分压组件分别与第N个节点和输出电压的负极连接；N个开关组件交错导通。(The invention relates to a booster circuit and a control method thereof, wherein in the booster circuit, a first end of an energy storage capacitor is respectively connected with a positive pole of an input voltage and a first end of a boosting inductor, and a second end of the energy storage capacitor is respectively connected with a negative pole of the input voltage and a negative pole of a reverse rectifier diode; the second end of the boost inductor is connected with the anode of the forward rectifying diode; the cathode of the forward rectifying diode is connected with the anode of the output voltage; the positive pole of the reverse rectifying diode is connected with the negative pole of the output voltage; the positive pole of the forward rectifier diode is used as the 1 st node, and the negative pole of the reverse rectifier diode is used as the (N + 1) th node; the nth switch component is respectively connected with the nth node and the (n + 1) th node; the mth voltage division component is respectively connected with the mth node and the (m + 1) th node; the 1 st voltage division component is respectively connected with the anode of the output voltage and the 2 nd node; the Nth voltage division component is respectively connected with the Nth node and the negative electrode of the output voltage; the N switch components are conducted in a staggered mode.)
1. A voltage boosting circuit for boosting an input voltage and outputting the boosted voltage, comprising: the power supply comprises an energy storage capacitor, a boosting inductor, N switch assemblies, a forward rectifying diode, a reverse rectifying diode and N voltage division assemblies;
the first end of the energy storage capacitor is respectively connected with the anode of the input voltage and the first end of the boost inductor, and the second end of the energy storage capacitor is respectively connected with the cathode of the input voltage and the cathode of the reverse rectifier diode;
the second end of the boosting inductor is connected with the anode of the forward rectifying diode;
the cathode of the forward rectifying diode is connected with the anode of the output voltage;
the positive electrode of the reverse rectifying diode is connected with the negative electrode of the output voltage;
the positive pole of the forward rectifying diode is used as the 1 st node, and the negative pole of the reverse rectifying diode is used as the (N + 1) th node;
the nth switch component is respectively connected with the nth node and the (N + 1) th node, and N is more than or equal to 1 and less than or equal to N;
the mth voltage division component is respectively connected with the mth node and the (m + 1) th node, and m is more than or equal to 2 and less than or equal to N-1;
the 1 st voltage division component is respectively connected with the anode of the output voltage and the 2 nd node;
the Nth voltage division component is respectively connected with the Nth node and the negative electrode of the output voltage;
the N switch assemblies are conducted in a staggered mode.
2. The booster circuit according to claim 1, further comprising: a control module;
the control module is respectively connected with the N switch assemblies and used for controlling the N switch assemblies to be conducted in a staggered mode.
3. The booster circuit according to claim 2, wherein the control module comprises a sampling circuit, a control chip and a driving circuit which are connected in sequence;
the driving circuit is respectively connected with the N switch components;
the sampling circuit comprises an input voltage sampling branch, an output voltage sampling branch, an input current sampling branch, an output current sampling branch and N voltage division component voltage sampling branches;
the input current sampling branch circuit is arranged at the positive pole or the negative pole of the input voltage and is used for collecting input current;
the output current sampling branch circuit is arranged at the positive pole or the negative pole of the output voltage and is used for collecting output current;
the input voltage sampling branch circuit is connected with the anode and the cathode of the input voltage and is used for collecting the input voltage;
the output voltage sampling branch is connected with the anode and the cathode of the output voltage and used for collecting the output voltage;
the N voltage division component voltage sampling branches are respectively connected with the N switch components in a one-to-one correspondence manner and are used for collecting the voltage of each voltage division component;
the control chip is used for processing the input voltage, the output voltage, the input current, the output current and the voltage of each voltage division component collected by the sampling circuit to generate N PWM control signals, and sending the N PWM control signals to the driving circuit to generate N corresponding driving signals so as to control the N switch components to be switched on in a staggered mode.
4. The boost circuit of claim 3, wherein the control chip is specifically configured to:
inputting the acquired input voltage, the output voltage, the input current and the output current into a maximum frequency tracking control unit, and calculating to obtain a reference voltage;
the acquired voltage of each voltage division component is subjected to difference calculation to obtain deviation voltage;
and regulating the reference voltage by using the deviation voltage to obtain N PWM modulation signals.
5. The booster circuit according to claim 3, wherein the drive circuit comprises: n identical drive legs;
the N driving branches are correspondingly connected with the N switch assemblies one by one and are respectively used for controlling the corresponding switch assemblies to be switched on and switched off.
6. The booster circuit according to claim 3, wherein the conduction phase difference between the xth switching element and the (N + 1) -x switching element is 180 degrees, and x is greater than or equal to 1 and less than or equal to N.
7. A boost circuit in accordance with claim 1, wherein each of said switching assemblies comprises: at least one switching tube.
8. The booster circuit according to claim 1, wherein each of the voltage dividing components comprises: at least one voltage dividing capacitor.
9. The boost circuit of claim 5, wherein the drive branch comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first diode, a second diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first triode, a second triode and an isolation optocoupler;
a first end of the isolation optocoupler is connected with a first end of the third resistor, a second end of the third resistor is connected with a first end of the first diode and a first end of the second diode, and a second end of the first diode is connected with a first end of the second resistor, a first end of the first capacitor and a first end of the first resistor;
a second end of the isolation optocoupler, a second end of the second diode, a second end of the second resistor and a second end of the first capacitor are grounded;
the third end of the isolation optocoupler is connected with the first end of the second capacitor, the first power supply and the collector electrode of the first triode;
the fourth end of the isolation optocoupler is connected with the first end of the sixth resistor,
a fifth end of the isolation optocoupler is connected with a first end of the third capacitor, a first end of the fourth resistor, a first end of the fourth capacitor, a collector of the second triode and a second power supply, a second end of the fourth resistor is connected with a first end of the fifth resistor, a second end of the fifth resistor is connected with a second end of the sixth resistor, a second end of the fourth capacitor, a base of the first triode and a base of the second triode, and an emitter of the first triode and an emitter of the second triode are connected to serve as a first output end of the driving signal;
the second end of the second capacitor is connected with the second end of the third capacitor to serve as a second output end of the driving signal;
and the second end of the first resistor is used as a PWM modulation signal input end.
10. A booster circuit control method applied to a booster circuit according to any one of claims 3 to 8, comprising:
the sampling circuit collects input voltage, output voltage, input current, output current and voltage of each voltage division component;
the control chip processes the acquired input voltage, the output voltage, the input current, the output current and the voltage of each voltage division component to generate PWM control signals;
and the driving circuit generates driving signals according to the PWM control signals and drives the N switching components to be switched on in a staggered mode.
Technical Field
The invention relates to the technical field of circuits, in particular to a booster circuit and a control method thereof.
Background
The non-renewable resources are increasingly in shortage, and green clean energy is more and more emphasized. Photovoltaic is a clean energy source, and power generation technology thereof is always concerned. However, the characteristics of the solar cell panel are greatly affected by the environment, and if the solar cell panel is directly used, the utilization rate of solar energy is low, and a booster circuit is generally added to improve the utilization rate. The BOOST circuit widely used at present is a BOOST circuit, and has the advantages of mature technology, simple control, fewer elements, high efficiency and the like.
However, as the power and voltage levels of the photovoltaic system are increased, the voltage stress borne by components in the conventional two-level BOOST circuit is also increased, the loss of the switching device is increased, the requirement on the performance of the device is higher, so that the adaptive device is difficult to select, and meanwhile, the high voltage change rate can also cause serious electromagnetic interference.
Disclosure of Invention
In view of the above, the present invention is directed to overcome the deficiencies of the prior art, and to provide a boost circuit and a control circuit thereof, so as to reduce the voltage stress of the device and meet the requirement of high level voltage.
In order to achieve the purpose, the invention adopts the following technical scheme:
a voltage boosting circuit for boosting and outputting an input voltage, comprising: the power supply comprises an energy storage capacitor, a boosting inductor, N switch assemblies, a forward rectifying diode, a reverse rectifying diode and N voltage division assemblies;
the first end of the energy storage capacitor is respectively connected with the anode of the input voltage and the first end of the boost inductor, and the second end of the energy storage capacitor is respectively connected with the cathode of the input voltage and the cathode of the reverse rectifier diode;
the second end of the boosting inductor is connected with the anode of the forward rectifying diode;
the cathode of the forward rectifying diode is connected with the anode of the output voltage;
the positive electrode of the reverse rectifying diode is connected with the negative electrode of the output voltage;
the positive pole of the forward rectifying diode is used as the 1 st node, and the negative pole of the reverse rectifying diode is used as the (N + 1) th node;
the nth switch component is respectively connected with the nth node and the (N + 1) th node, and N is more than or equal to 1 and less than or equal to N;
the mth voltage division component is respectively connected with the mth node and the (m + 1) th node, and m is more than or equal to 2 and less than or equal to N-1;
the 1 st voltage division component is respectively connected with the anode of the output voltage and the 2 nd node;
the Nth voltage division component is respectively connected with the Nth node and the negative electrode of the output voltage;
the N switch assemblies are conducted in a staggered mode.
Optionally, the method further includes: a control module;
the control module is respectively connected with the N switch assemblies and used for controlling the N switch assemblies to be conducted in a staggered mode.
Optionally, the control module includes a sampling circuit, a control chip and a driving circuit, which are connected in sequence;
the driving circuit is respectively connected with the N switch components;
the sampling circuit comprises an input voltage sampling branch, an output voltage sampling branch, an input current sampling branch, an output current sampling branch and N voltage division component voltage sampling branches;
the input current sampling branch circuit is arranged at the positive pole or the negative pole of the input voltage and is used for collecting input current;
the output current sampling branch circuit is arranged at the positive pole or the negative pole of the output voltage and is used for collecting output current;
the input voltage sampling branch circuit is connected with the anode and the cathode of the input voltage and is used for collecting the input voltage;
the output voltage sampling branch is connected with the anode and the cathode of the output voltage and used for collecting the output voltage;
the N voltage division component voltage sampling branches are respectively connected with the N switch components in a one-to-one correspondence manner and are used for collecting the voltage of each voltage division component;
the control chip is used for processing the input voltage, the output voltage, the input current, the output current and the voltage of each voltage division component collected by the sampling circuit to generate N PWM control signals, and sending the N PWM control signals to the driving circuit to generate N corresponding driving signals so as to control the N switch components to be switched on in a staggered mode.
Optionally, the control chip is specifically configured to:
inputting the acquired input voltage, the output voltage, the input current and the output current into a maximum frequency tracking control unit, and calculating to obtain a reference voltage;
the acquired voltage of each voltage division component is subjected to difference calculation to obtain deviation voltage;
and regulating the reference voltage by using the deviation voltage to obtain N PWM modulation signals.
Optionally, the driving circuit includes: n identical drive legs;
the N driving branches are correspondingly connected with the N switch assemblies one by one and are respectively used for controlling the corresponding switch assemblies to be switched on and switched off.
Optionally, the conduction phase difference between the xth switch component and the (N + 1) -x switch component is 180 degrees, and x is greater than or equal to 1 and is less than or equal to N.
Optionally, each of the switch assemblies includes: at least one switching tube.
Optionally, each of the voltage dividing assemblies includes: at least one voltage dividing capacitor.
Optionally, the driving branch comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first diode, a second diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first triode, a second triode and an isolation optocoupler;
a first end of the isolation optocoupler is connected with a first end of the third resistor, a second end of the third resistor is connected with a first end of the first diode and a first end of the second diode, and a second end of the first diode is connected with a first end of the second resistor, a first end of the first capacitor and a first end of the first resistor;
a second end of the isolation optocoupler, a second end of the second diode, a second end of the second resistor and a second end of the first capacitor are grounded;
the third end of the isolation optocoupler is connected with the first end of the second capacitor, the first power supply and the collector electrode of the first triode;
the fourth end of the isolation optocoupler is connected with the first end of the sixth resistor,
a fifth end of the isolation optocoupler is connected with a first end of the third capacitor, a first end of the fourth resistor, a first end of the fourth capacitor, a collector of the second triode and a second power supply, a second end of the fourth resistor is connected with a first end of the fifth resistor, a second end of the fifth resistor is connected with a second end of the sixth resistor, a second end of the fourth capacitor, a base of the first triode and a base of the second triode, and an emitter of the first triode and an emitter of the second triode are connected to serve as a first output end of the driving signal;
the second end of the second capacitor is connected with the second end of the third capacitor to serve as a second output end of the driving signal;
and the second end of the first resistor is used as a PWM modulation signal input end.
A control method of a booster circuit, applied to the booster circuit described in any one of the above, comprising:
the sampling circuit collects input voltage, output voltage, input current, output current and voltage of each voltage division component;
the control chip processes the acquired input voltage, the output voltage, the input current, the output current and the voltage of each voltage division component to generate PWM control signals;
and the driving circuit generates driving signals according to the PWM control signals and drives the N switching components to be switched on in a staggered mode.
The technical scheme provided by the application can comprise the following beneficial effects:
the application provides a boost circuit for step up and export input voltage, wherein include N switch module and N partial pressure subassembly that respectively the one-to-one set up, N partial pressure subassembly divides voltage to output voltage, and is corresponding, and N switch module's voltage stress also obtains reducing, and the loss reduces, and the lectotype of device is also more simple and convenient, simultaneously, also can correspondingly reduce electromagnetic interference.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit configuration diagram of a voltage boost circuit according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a control module according to an embodiment of the present invention.
Fig. 3 is a schematic circuit structure diagram of a driving branch according to an embodiment of the present invention.
Fig. 4 is a flowchart of a control method of a boost circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The application provides a boost circuit for stepping up and exporting input voltage, boost circuit includes: the power supply comprises an energy storage capacitor, a boosting inductor, N switch assemblies, a forward rectifying diode, a reverse rectifying diode and N voltage division assemblies;
the first end of the energy storage capacitor is respectively connected with the anode of the input voltage and the first end of the boosting inductor, and the second end of the energy storage capacitor is respectively connected with the cathode of the input voltage and the cathode of the reverse rectifying diode;
the second end of the boost inductor is connected with the anode of the forward rectifying diode;
the cathode of the forward rectifying diode is connected with the anode of the output voltage;
the positive pole of the reverse rectifying diode is connected with the negative pole of the output voltage;
the positive pole of the forward rectifier diode is used as the 1 st node, and the negative pole of the reverse rectifier diode is used as the (N + 1) th node;
the nth switch component is respectively connected with the nth node and the (N + 1) th node, and N is more than or equal to 1 and less than or equal to N;
the mth voltage division component is respectively connected with the mth node and the (m + 1) th node, and m is more than or equal to 2 and less than or equal to N-1;
the 1 st voltage division component is respectively connected with the anode of the output voltage and the 2 nd node;
the Nth voltage division component is respectively connected with the Nth node and the negative electrode of the output voltage;
the N switch components are conducted in a staggered mode.
The application provides a boost circuit for step up and export input voltage, wherein include N switch module and N partial pressure subassembly that respectively the one-to-one set up, N partial pressure subassembly divides voltage to output voltage, and is corresponding, and N switch module's voltage stress also obtains reducing, and the loss reduces, and the lectotype of device is also more simple and convenient, simultaneously, also can correspondingly reduce electromagnetic interference.
According to the different values of N, multi-level boost circuits with different specific structures can be formed, but the circuit principles are similar, and the principle of voltage division is adopted, so that for convenience of understanding and explanation, in the embodiment section, a three-level boost circuit (that is, N is 2) is taken as an example, and detailed description is given.
Referring to fig. 1, fig. 1 is a circuit configuration diagram of a voltage boost circuit according to an embodiment of the present invention. As shown in fig. 1, the boost circuit provided in this embodiment is a three-level boost circuit, that is, the circuit structure when N takes a value of 2 specifically includes: the power supply comprises an energy storage capacitor C1, a boosting inductor L1, switching components Q1 and Q2, a forward rectifier diode D1, a reverse rectifier diode D2 and voltage division components C2 and C3;
the first end of the energy storage capacitor C1 is respectively connected with the positive electrode Vin + of the input voltage and the first end of the boosting inductor L1, and the second end of the energy storage capacitor C1 is respectively connected with the negative electrode Vin-of the input voltage and the negative electrode of the reverse rectifying diode D2;
the second end of the boosting inductor L1 is connected with the anode of the forward rectifying diode D1;
the cathode of the forward rectifying diode D1 is connected with the anode Vout + of the output voltage;
the anode of the reverse rectifying diode D2 is connected with the cathode Vout-of the output voltage;
the positive pole of the forward rectifying diode D1 is used as the 1 st node P1, and the negative pole of the reverse rectifying diode D2 is used as the 3 rd node P3;
the collector of the 1 st switching element Q1 is connected to the 1 st node P1, and the emitter is connected to the 2 nd node P2;
the collector of the 2 nd switching element Q2 is connected to the 2 nd node P2, and the emitter is connected to the 3 rd node P3;
the 1 st voltage dividing component C2 is respectively connected with the anode Vout + of the output voltage and the 2 nd node P2;
the 2 nd voltage dividing component C3 is respectively connected with the 2 nd node P2 and the negative pole Vout-of the output voltage;
the 2 switch elements Q1 and Q2 are conducted alternatively.
The two voltage division components C2 and C3 realize voltage division, and 2 switching components Q1 and Q2 are conducted in a staggered mode, so that the voltage stress is reduced, and the loss is reduced.
In this embodiment, the switching elements Q1 and Q2 are a switching tube, such as a transistor, and in other embodiments, a plurality of switching tubes may be connected in parallel to form a switching element, different switching elements are conducted in a staggered manner, and the switching tubes in the same switching element are connected in parallel, so that the timings are consistent.
In order to realize accurate control of the conduction time and the duty ratio of the two switching elements, optionally, the boost circuit provided by this embodiment further includes a control module, and the control module is connected with the 2 switching elements Q1 and Q2 respectively, and is used for controlling the 2 switching elements Q1 and Q2 to be turned on alternately.
Referring to fig. 2, fig. 2 is a schematic circuit structure diagram of a control module according to an embodiment of the present invention. As shown in fig. 2, the control module includes a sampling circuit 21, a control chip 22 and a driving circuit 23 connected in sequence;
the driving circuit 23 is connected with 2 switching elements Q1 and Q2 respectively;
the sampling circuit 21 comprises an input voltage sampling branch 211, an output voltage sampling branch 212, an input current sampling branch 213, an output current sampling branch 214, a first voltage-dividing assembly voltage sampling branch 215 and a second voltage-dividing assembly voltage sampling branch 216;
the input current sampling branch 213 is disposed at the positive electrode or the negative electrode of the input voltage, and is used for collecting the input current;
the output current sampling branch 214 is arranged at the positive pole or the negative pole of the output voltage and is used for collecting the output current;
the input voltage sampling branch 211 is connected with the positive pole and the negative pole of the input voltage and used for collecting the input voltage;
the output voltage sampling branch 212 is connected with the anode and the cathode of the output voltage and used for collecting the output voltage;
the first voltage division component voltage sampling branch 215 is connected with a voltage division component C2 and is used for collecting the voltage of the voltage division component C2;
the second voltage division component voltage sampling branch 216 is connected with the voltage division component C3 and is used for collecting the voltage of the voltage division component C3;
and the control chip 22 is configured to process the input voltage, the output voltage, the input current, the output current, and the two voltage dividing component voltages collected by the sampling circuit 21, generate 2 PWM control signals, and send the 2 PWM control signals to the driving circuit 23 to generate 2 corresponding driving signals, so as to control the 2 switching components Q1 and Q2 to be switched on in a staggered manner.
The current sampling branch can adopt a current Hall mutual inductor, the voltage sampling branch can adopt a differential sampling circuit, the two sampling circuits are common circuits in the related technology, the specific circuit structure and principle are not repeated, and other sampling circuits can be used certainly.
The control chip may adopt a chip of the model TMS320F28035, and the setting of the peripheral circuits for realizing the basic functions may be realized by referring to related technologies, which are not described herein.
Specifically, the drive circuit includes: 2 same drive branches, 2 drive branches and 2 switch module one-to-one link to each other, receive 2 PWM control signals that control chip sent, correspond and generate 2 drive signals, control corresponding switch module respectively and switch on and cut off.
In the practical application of the boost circuit, in order to improve the utilization rate of solar energy, a Maximum Power Point Tracking (MPPT) function is generally added, and the MPPT function can be realized by setting an internal program of a control chip, which can also find a specific implementation manner in the related art, and the application refers to a control logic of the MPPT directly.
In addition, in the multi-level boost circuit provided in the above embodiment, although the voltage division may be implemented by the plurality of voltage division components, in an actual application process, under the influence of the difference between the electronic device and the output of the subsequent stage, the voltage division of each voltage division component may be unbalanced, so that, in an extreme case, if a voltage division of a certain voltage division component is too high, a phenomenon of too high voltage stress may still be caused.
Specifically, the control logic of the control chip is as follows:
inputting the acquired input voltage, output voltage, input current and output current into an MPPT control unit, and calculating to obtain reference voltage;
the voltage of each acquired voltage division component is subjected to difference calculation to obtain deviation voltage;
and regulating the reference voltage by using the deviation voltage to obtain 2 PWM modulation signals.
The method comprises the steps of utilizing a virtual model capable of achieving maximum power tracking to correspondingly process collected input voltage, output voltage, input current and output current, achieving the maximum power tracking function through a disturbance observation method, and meanwhile outputting a reference voltage for comparing with the voltages of two voltage division assemblies to determine the adjustment direction so as to achieve voltage sharing.
The voltage of the voltage dividing assemblies C2 and C3 is subtracted to obtain a difference, which is referred to as "deviation voltage" in this application because it represents the deviation of the two divided voltages, and is also the adjustment direction of the voltage.
The deviation voltage is used for adjusting the reference voltage, the conduction time is adjusted through PWM, and the voltage-sharing effect is finally achieved.
For example, when the voltage of C2 is higher than the voltage of the lower capacitor C1, the on-time of Q1 is increased while the on-time of Q2 is decreased so that the voltages on both sides tend to equalize, i.e., Vout/2.
Optionally, the conducting phase difference between the 1 st switching element Q1 and the 2 nd switching element Q2 is 180 degrees.
The conduction time sequence can be adjusted through PWM modulation, and experiments show that when the conduction phase difference between Q1 and Q2 is 180 degrees, the generated output ripple is minimum, and the voltage stability is highest.
Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of a driving branch according to an embodiment of the present invention. As shown in fig. 3, the driving branch includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first diode D3, a second diode D4, a first capacitor C4, a second capacitor C5, a third capacitor C6, a fourth capacitor C7, a first triode Q3, a second triode Q4 and an isolation optocoupler OP 1;
a first end of the isolation optocoupler OP1 is connected with a first end of a third resistor R3, a second end of the third resistor R3 is connected with a first end of a first diode D3 and a first end of a second diode D4, and a second end of a first diode D3 is connected with a first end of a second resistor R2, a first end of a first capacitor C4 and a first end of a first resistor R1;
the second end of the isolation optocoupler OP1, the second end of the second diode D4, the second end of the second resistor R2 and the second end of the first capacitor C4 are grounded;
the third end of the isolation optocoupler OP1 is connected with the first end of the second capacitor C5, the first power supply and the collector of the first triode Q3;
the fourth end of the isolating optocoupler OP1 is connected with the first end of the sixth resistor R6,
a fifth end of the isolation optocoupler OP1 is connected with a first end of a third capacitor C6, a first end of a fourth resistor R4, a first end of a fourth capacitor C7, a collector of a second triode Q4 and a second power supply, a second end of a fourth resistor R4 is connected with a first end of a fifth resistor R5, a second end of a fifth resistor R5 is connected with a second end of a sixth resistor R6, a second end of a fourth capacitor C7, a base of a first triode Q3 and a base of a second triode Q4, and an emitter of the first triode Q3 and an emitter of the second triode Q4 are connected to serve as a first output end of the driving signal;
a second end of the second capacitor C5 is connected with a second end of the third capacitor C6 as a second output end of the driving signal;
the second end of the first resistor R1 is used as the input end of the PWM modulation signal.
The first output end of the driving signal is connected to the grid electrode of the switch tube, and the second output end of the driving signal is connected to the source electrode of the switch tube, so that the switch tube is driven to be switched on or switched off by applying voltage.
Optionally, each switch assembly comprises: at least one switching tube.
Optionally, each voltage dividing assembly comprises: at least one voltage dividing capacitor.
Referring to fig. 4, fig. 4 is a flowchart of a control method for a boost circuit according to an embodiment of the present invention, where the method is applied to the boost circuit according to any of the above embodiments, and as shown in fig. 4, the control method for the boost circuit according to the embodiment includes the following steps:
s401, a sampling circuit collects input voltage, output voltage, input current, output current and voltage of each voltage division component.
S402, the control chip processes the collected input voltage, output voltage, input current, output current and voltage of each voltage division component to generate PWM control signals.
And S403, the driving circuit generates driving signals according to the PWM control signals and drives the N switching components to be conducted in a staggered mode.
The present embodiment has the same technical features as any of the above embodiments, and can achieve the same technical effects, which are not described herein again.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.