CN221151207U - Cascaded boost module and application circuit thereof - Google Patents
Cascaded boost module and application circuit thereof Download PDFInfo
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- CN221151207U CN221151207U CN202323129689.1U CN202323129689U CN221151207U CN 221151207 U CN221151207 U CN 221151207U CN 202323129689 U CN202323129689 U CN 202323129689U CN 221151207 U CN221151207 U CN 221151207U
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Abstract
The application provides a cascade type boost module and an application circuit thereof, wherein the cascade type boost module comprises at least two stages of bootstrap boost circuits, the high potential end of each stage of bootstrap boost circuit is connected with the low potential end of the next stage of bootstrap boost circuit, the low potential end of the first stage of bootstrap boost circuit is used as the low potential end of the cascade type boost module, and the high potential end of the last stage of bootstrap boost circuit is used as the high potential end of the cascade type boost module; each stage of bootstrap boost circuit comprises a first diode and a first capacitor, wherein the positive electrode of the first diode is a low potential end of the stage of bootstrap boost circuit, the negative electrode of the first diode is a high potential end of the stage of bootstrap boost circuit, the first end of the first capacitor is connected with the negative electrode of the first diode, and the second end of the first capacitor receives PWM signals. The cascade boosting module provided by the application does not need an extra boosting power supply, and only drives the voltage to rise through the potential difference between the high level and the low level of the PWM signal.
Description
Technical Field
The application belongs to the technical field of circuit boosting, relates to a PWM signal control boosting technology, and particularly provides a cascading boosting module and an application circuit thereof.
Background
The bootstrap boost circuit is one of common circuits in electronic circuits, and is often applied to control of peripheral devices of an IC, and uses electronic elements such as a diode, a capacitor, a MOS tube and the like to superimpose a capacitor discharge voltage and a power supply voltage, thereby realizing voltage boost.
At present, a common bootstrap boost circuit generally needs a separate DC power supply to charge a capacitor, and in some application occasions with higher requirements on the circuit scale, the separate DC power supply is arranged, so that the circuit design difficulty and the product cost are obviously increased; meanwhile, when the reference voltage which dynamically changes needs to be lifted, the DC power supply with the fixed amplitude cannot well meet the requirement of dynamic boosting.
Therefore, there is a need for a circuit configuration that can utilize the interface of an existing IC without a separate boost source and that can achieve flexible boosting according to dynamic boosting needs.
Disclosure of utility model
In order to solve the problems in the prior art, the application provides a cascading type boost module, which comprises at least two stages of bootstrap boost circuits, wherein the high potential end of each stage of bootstrap boost circuit is connected with the low potential end of the next stage of bootstrap boost circuit, the low potential end of the first stage of bootstrap boost circuit is used as the low potential end of the cascading type boost module, and the high potential end of the last stage of bootstrap boost circuit is used as the high potential end of the cascading type boost module;
Each stage of bootstrap boost circuit comprises a first diode and a first capacitor, wherein the positive electrode of the first diode is a low potential end of the stage of bootstrap boost circuit, the negative electrode of the first diode is a high potential end of the stage of bootstrap boost circuit, the first end of the first capacitor is connected with the negative electrode of the first diode, and the second end of the first capacitor receives PWM signals.
Preferably, the potential difference maintaining time of the first capacitor in each stage of bootstrap boost circuit is greater than 1.2 times of the low level duration of the PWM signal.
Preferably, the PWM signals received by the second segments of the first capacitances of any adjacent two-stage bootstrap boost circuit are mutually inverted.
Preferably, the cascade boosting module includes a bootstrap boosting circuit with 4 stages.
Further, the second ends of the first capacitors of the 1 st stage bootstrap boost circuit and the 3 rd stage bootstrap boost circuit are connected in parallel and receive a first PWM signal; the second ends of the first capacitors of the 2 nd and 4 th stage bootstrap boost circuits are connected in parallel and receive the second PWM signal.
Preferably, the boost value of the cascaded boost module is greater than 11V.
The application also provides an application circuit of the cascade boost module, which comprises at least one switching tube and the cascade boost module corresponding to the switching tube; each switching tube is enabled by the high potential end of the corresponding cascade type boosting module, and the low potential end of the cascade type boosting module is connected with the input end of the corresponding switching tube; each switching tube is used for conducting the input end and the output end of the switching tube when the difference value between the voltage of the enabling end and the voltage of the input end is larger than the conducting threshold voltage.
The cascade boosting module provided by the application directly drives voltage to rise through the potential difference between the high level and the low level of the PWM signal on the basis that the conventional bootstrap boosting circuit controls the boosting of the energy storage capacitor and the energy storage state conversion by using the PWM signal, so that the step-by-step voltage rising from the low potential end to the high potential end voltage can be realized without additionally providing a boosting power supply, and the proper cascade quantity can be set according to specific boosting requirements.
Drawings
FIG. 1 is a schematic diagram of a cascaded boost module provided according to an embodiment of the present application;
Fig. 2 is a schematic diagram of an application circuit of a cascaded boost module according to an embodiment of the application.
Detailed Description
The present application will be further described below based on preferred embodiments with reference to the accompanying drawings.
In the description of the embodiments of the present application, it should be noted that, if the terms "upper," "lower," "inner," "outer," and the like indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship that a product of the embodiments of the present application conventionally put in use, it is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, in the description of the present application, terms first, second, etc. are used herein for distinguishing between different elements, but not limited to the order of manufacture, and should not be construed as indicating or implying any relative importance, as such may be different in terms of its detailed description and claims.
The terminology used in the description presented herein is for the purpose of describing embodiments of the application and is not intended to be limiting of the application. It should also be noted that unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the two components can be connected mechanically, directly or indirectly through an intermediate medium, and can be communicated internally. The specific meaning of the above terms in the present application will be specifically understood by those skilled in the art.
Fig. 1 is a schematic circuit diagram of a cascaded boost module according to some preferred embodiments of the present application, as shown in fig. 1, where the cascaded boost module includes a 4-stage bootstrap boost circuit.
Specifically, as shown in fig. 1, the 1 st stage bootstrap boost circuit includes a first diode D1 and a first capacitor C1, where the positive electrode of the first diode D1 is the low potential end of the stage bootstrap boost circuit, the negative electrode is the high potential end of the stage bootstrap boost circuit, the first end of the first capacitor C1 is connected with the negative electrode of the first diode D1, and the second end receives the PWM signal.
The level-2 bootstrap boost circuit comprises a first diode D2 and a first capacitor C2, the level-3 bootstrap boost circuit comprises a first diode D3 and a first capacitor C3, the level-4 bootstrap boost circuit comprises a first diode D4 and a first capacitor C4, the level-four bootstrap boost circuits are sequentially cascaded, the high potential end of each level bootstrap boost circuit is connected with the low potential end of the next level bootstrap boost circuit, the low potential end of the level-1 bootstrap boost circuit is used as the low potential end V_ LOW of the cascaded boost module, and the high potential end of the level-4 bootstrap boost circuit is used as the high potential end V_ HIGH of the cascaded boost module.
The PWM signal may be generated by a microprocessor chip such as an MCU, and output through an I/O pin thereof, or may be generated and output by a dedicated oscillator or PWM signal generator, which are known to those skilled in the art, and will not be described herein.
The working principle of the cascade boosting module is as follows: when the first capacitor C1 of the 1 st stage bootstrap boost circuit receives the PWM signal (generally, the high level of the PWM signal output by the MCU chip through the I/O pin is 3.3V, and the low level is 0V), the first capacitor C1, when receiving the high level pulse, raises the voltage of the negative electrode of the first diode D1 to a voltage 3.3V higher than the positive electrode thereof minus the voltage drop of the diode itself, and when the receiving signal of the first capacitor C1 becomes low, the negative electrode of the first diode D1 is maintained at the voltage by using the charge holding function of the first capacitor C1, so that the negative electrode of the first diode D1 is raised relative to the positive electrode thereof by a continuous voltage. Further, since the 2 nd to 4 th stage bootstrap and boost circuits are cascaded, each stage of bootstrap and boost circuit performs voltage boost through PWM signals, so that the voltage amount of the high potential end of the fourth stage bootstrap and boost circuit, i.e. the high potential end v_ HIGH of the whole cascaded boost module, raised relative to the low potential end v_ LOW is 4 times the voltage raising amount of each stage of bootstrap and boost circuit.
The cascade boosting module directly drives voltage lifting through the potential difference between the high level and the low level of the PWM signal on the basis that the conventional bootstrap boosting circuit controls boosting and energy storage state conversion of the energy storage capacitor by using the PWM signal, so that step-by-step voltage lifting from the low potential end to the high potential end voltage can be realized without additionally providing a boosting power supply, and proper cascade quantity can be set according to specific boosting requirements, for example, cascade connection of two-stage bootstrap boosting circuits or cascade connection of five-stage, six-stage or even more bootstrap boosting circuits is adopted.
In addition, in order to simplify the circuit and save the computing resources, the first capacitor C1 of the stage 1 bootstrap boost circuit and the first capacitor C3 of the stage 3 bootstrap boost circuit may receive the same pwm_1 signal (i.e., the first PWM signal), and the first capacitor C2 of the stage 2 bootstrap boost circuit and the first capacitor C4 of the stage 4 bootstrap boost circuit may receive the same pwm_2 signal (i.e., the second PWM signal), as shown in fig. 1.
To ensure that each stage of bootstrap boost circuit is able to stably sustain a voltage boost, in some preferred embodiments, the potential difference sustain time of the first capacitor in each stage of bootstrap boost circuit is greater than 1.2 times the low level duration of the PWM signal. For example, in one specific embodiment, the first capacitor has a capacitance of 1uF, the PWM signal has an amplitude of 3.3V, a period of 10 -4 seconds, and a duty cycle of 0.4. In addition, in some alternative embodiments, PWM signals received by the second ends of the first capacitors of any two adjacent two-stage bootstrap boost circuits may also be set to be opposite to each other, where the duty cycle of each PWM signal may be set to be 0.5.
The cascade boost module can be applied to control of a switching circuit of a switching tube and other element structures, such as a normally open switching circuit controlled by an NMOS tube. Fig. 2 illustrates a schematic diagram of an application circuit of a cascaded boost module provided in accordance with some preferred embodiments.
The application circuit shown in fig. 2 is connected between the positive electrode b+ of the battery and the positive electrode p+ of the load to control the on-off between the two, specifically, the application circuit comprises a switch tube (an NMOS tube Q1 in fig. 2) and a cascade boost module for controlling the switch tube, the S end of the NMOS tube Q1 is connected with the positive electrode b+ of the battery, the D electrode is connected with the positive electrode p+ of the load, the G electrode is connected with the high potential end of the cascade boost module, and the low potential end of the cascade boost module is connected with the positive electrode b+ of the battery. In addition, the application circuit further comprises peripheral elements such as resistors R27 and R24 and diodes D5 and D6.
When the cascade boost module receives PWM signals input by the CHG_P and CHG_N pins, the high potential end of the cascade boost module passes through the four-stage bootstrap boost circuit, and the potential is stably higher than the positive pole B+ of the battery by more than 11V, so that the S-stage to D-stage of the NMOS tube Q1 is stably conducted; when the direct current signals of high-level or low-level signals are input to the CHG_P and CHG_N pins, the bootstrap boost circuits at all stages cannot stably realize voltage lifting, so that the voltage of a high-potential end is lower than that of a low-potential end, and the S stage and the D stage of the Q1 are disconnected. By the application circuit, the control of the battery-driven load can be realized without separately providing a boost voltage source.
In other embodiments, the number of cascaded boost modules may be increased to control more switching tubes, for example, when the positive electrode, the charging positive electrode and the discharging positive electrode of the rechargeable battery need to be controlled, the switching tubes may be respectively arranged between the positive electrode and the charging positive electrode and between the positive electrode and the discharging positive electrode, and enabled by the cascaded boost modules, so as to realize independent control of charging and discharging.
While the foregoing is directed to embodiments of the present application, other and further embodiments of the application may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (7)
1. A cascading boost module, characterized in that:
The high-potential end of the bootstrap boost circuit of the last stage is used as the high-potential end of the cascade boost module;
Each stage of bootstrap boost circuit comprises a first diode and a first capacitor, wherein the positive electrode of the first diode is a low potential end of the stage of bootstrap boost circuit, the negative electrode of the first diode is a high potential end of the stage of bootstrap boost circuit, the first end of the first capacitor is connected with the negative electrode of the first diode, and the second end of the first capacitor receives PWM signals.
2. The cascaded boost module of claim 1, wherein:
The potential difference maintaining time of the first capacitor in each stage of bootstrap boost circuit is greater than 1.2 times of the low level duration of the PWM signal.
3. The cascaded boost module of claim 1, wherein:
The PWM signals received by the second sections of the first capacitors of any adjacent two-stage bootstrap boost circuit are mutually inverted.
4. The cascaded boost module of claim 1, wherein:
The cascade boost module comprises a bootstrap boost circuit with the number of stages of 4.
5. The cascaded boost module of claim 4, wherein:
The second ends of the first capacitors of the 1 st stage bootstrap boost circuit and the 3 rd stage bootstrap boost circuit are connected in parallel and receive a first PWM signal;
The second ends of the first capacitors of the 2 nd and 4 th stage bootstrap boost circuits are connected in parallel and receive the second PWM signal.
6. The cascaded boost module of claim 5, wherein:
The boost value of the cascade boost module is larger than 11V.
7. An application circuit of a cascade boost module, which is characterized by comprising at least one switching tube and the cascade boost module corresponding to the switching tube as claimed in claim 1;
Each switching tube is enabled by the high potential end of the corresponding cascade type boosting module, and the low potential end of the cascade type boosting module is connected with the input end of the corresponding switching tube;
each switching tube is used for conducting the input end and the output end of the switching tube when the difference value between the voltage of the enabling end and the voltage of the input end is larger than the conducting threshold voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323129689.1U CN221151207U (en) | 2023-11-17 | 2023-11-17 | Cascaded boost module and application circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323129689.1U CN221151207U (en) | 2023-11-17 | 2023-11-17 | Cascaded boost module and application circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN221151207U true CN221151207U (en) | 2024-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202323129689.1U Active CN221151207U (en) | 2023-11-17 | 2023-11-17 | Cascaded boost module and application circuit thereof |
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| CN (1) | CN221151207U (en) |
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2023
- 2023-11-17 CN CN202323129689.1U patent/CN221151207U/en active Active
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