CN212518803U - Novel numerical control high voltage generation circuit - Google Patents
Novel numerical control high voltage generation circuit Download PDFInfo
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- CN212518803U CN212518803U CN202021349567.7U CN202021349567U CN212518803U CN 212518803 U CN212518803 U CN 212518803U CN 202021349567 U CN202021349567 U CN 202021349567U CN 212518803 U CN212518803 U CN 212518803U
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Abstract
A novel numerical control high-voltage generation circuit comprises a controller, a power driver, a transformer, a rectifier and a high-voltage output end, wherein the controller, the power driver, the transformer, the rectifier and the high-voltage output end are sequentially connected; the controller includes a logic device and a gate driver. The application has the following advantages: the pulse width modulation control chip and the peripheral circuit thereof of the switching power supply are removed, the digital-to-analog conversion circuit and the reference voltage chip for providing accurate voltage for the digital-to-analog conversion circuit are removed, and the circuit is simplified; the power driver, the boosting transformer, the rectifier filter and the high-voltage output end are completely consistent with those of a traditional high-voltage generating circuit, so that the circuit is convenient to transform; the gate driver circuit is optional, and the circuit application is more flexible; the proportion of the analog circuit is greatly reduced, the stability and controllability of the circuit are improved, the failure rate is reduced, and the cost is reduced; the circuit adopts digital accurate control, so that the duty ratio can be close to 50%, and higher output high voltage can be obtained.
Description
Technical Field
The invention relates to the field of high-voltage generation circuits, in particular to a novel numerical control high-voltage generation circuit.
Background
The high voltage in the high voltage generating circuit refers to a stable voltage exceeding 1000 v, but the required current is relatively small, and the high voltage generating circuit is widely applied to products needing arc discharge, such as a welding machine and the like.
The traditional high-voltage generating circuit is almost based on a switching power supply pulse width modulation control chip, and the working process is as follows: the output voltage of the DAC chip is controlled by the control logic devices such as the MCU/FPGA through a digital interface, the output voltage of the DAC chip controls the duty ratio of the PWM signal output by the pulse width modulation control chip of the switching power supply, two paths of PWM output of the pulse width modulation control chip of the switching power supply push a power driver 1 and a power driver 2 in a push-pull mode, the power driver 1 and the power driver 2 push a boost transformer in a push-pull mode, and a rectifier filter rectifies the output signal of the boost transformer and outputs the finally required high voltage. The final high voltage is controlled by logic control devices such as MCU/FPGA.
The high-voltage generating circuit based on the pulse width modulation control chip of the switching power supply has the following characteristics: two paths of PWM signals are generated by a pulse width modulation control chip of a switching power supply to form push-pull output; the duty ratio of the output PWM signal can be controlled by the voltage signal, thereby controlling the finally output voltage.
However, the conventional high voltage generating circuit has the disadvantages of complicated circuit, high cost, low flexibility, various matching circuits and driving circuits in practical circuit application, and very complicated peripheral circuits.
Therefore, the problems of the prior art are to be further improved and developed.
Disclosure of Invention
The object of the invention is: in order to solve the problems in the prior art, the present invention provides a novel digital control high voltage generating circuit.
The technical scheme is as follows: in order to solve the above technical problems, the present technical solution provides a novel digital control high voltage generating circuit, which comprises a controller, a power driver, a transformer, a rectifier and a high voltage output terminal,
the controller, the power driver, the transformer, the rectifier and the high-voltage output end are connected in sequence;
the controller includes a logic device and a gate driver.
The novel numerical control high-voltage generation circuit is characterized in that the logic device is a microcontroller or a programmable logic gate array.
The novel numerical control high-voltage generation circuit is characterized in that the transformer is a boosting transformer.
The novel numerical control high-voltage generation circuit is characterized in that the rectifier is a rectifier filter.
The novel numerical control high-voltage generating circuit is characterized in that the power driver comprises a first power driver and a second power driver,
the controller is respectively connected with the input ends of the first power driver and the second power driver, and the output ends of the first power driver and the second power driver are respectively connected with the transformer.
The novel numerical control high voltage generation circuit is characterized in that the grid driver comprises a first grid driver and a second grid driver,
the logic device is respectively connected with the input ends of the first grid driver and the second grid driver, the output end of the first grid driver is connected with the first power driver, and the output end of the second grid driver is connected with the second power driver.
The novel numerical control high-voltage generating circuit also comprises an analog-to-digital conversion module, a filter and a voltage division circuit,
the voltage division circuit, the filter, the analog-to-digital conversion module and the controller are sequentially connected, and the input end of the voltage division circuit is connected with the output end of the transformer.
The novel numerical control high-voltage generation circuit is characterized in that the analog-to-digital conversion module is an analog-to-digital converter.
(III) the beneficial effects are as follows: the invention provides a novel numerical control high-voltage generating circuit, which has the following advantages:
the pulse width modulation control chip and the peripheral circuit of the switching power supply are removed;
the digital-to-analog conversion circuit and a reference voltage chip for providing accurate voltage for the digital-to-analog conversion circuit are removed;
the power driver, the boosting transformer, the rectifier filter and the high-voltage output end are completely consistent with those of a traditional high-voltage generating circuit, so that the circuit is convenient to transform;
the gate driver circuit is optional, and the circuit application is more flexible;
the proportion of the analog circuit is greatly reduced, the stability and controllability of the circuit are increased, the failure rate is reduced, and the cost is reduced;
the circuit has a duty ratio close to 50% due to the digital precise control, which means that the circuit can obtain higher output high voltage under the condition of using a common power supply end with the same voltage.
Drawings
FIG. 1 is a block diagram of a preferred embodiment of a novel digitally controlled high voltage generating circuit of the present invention;
FIG. 2 is a circuit diagram of a preferred embodiment of a novel digitally controlled high voltage generating circuit of the present invention;
FIG. 3 is a block diagram of another preferred embodiment of a novel digitally controlled high voltage generating circuit of the present invention;
FIG. 4 is a circuit diagram of another preferred embodiment of a novel digitally controlled high voltage generating circuit of the present invention;
fig. 5 is a block diagram of another preferred embodiment of a novel digitally controlled high voltage generating circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to preferred embodiments, and more details are set forth in the following description in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from the description herein and can be similarly generalized and deduced by those skilled in the art based on the practical application without departing from the spirit of the present invention, and therefore, the scope of the present invention should not be limited by the contents of this detailed embodiment.
The drawings are schematic representations of embodiments of the invention, and it is noted that the drawings are intended only as examples and are not drawn to scale and should not be construed as limiting the true scope of the invention.
The following description will be made in detail with reference to a preferred embodiment of the novel digitally controlled high voltage generating circuit provided by the present invention.
The novel numerical control high-voltage generation circuit shown in fig. 1 and 2 comprises a controller, a power driver, a transformer, a rectifier and a high-voltage output end.
The controller, the power driver, the transformer, the rectifier and the high-voltage output end are connected in sequence. The controller comprises a logic device and a gate driver, when the working frequency of the pulse width modulation signal is low, the driving current output by the logic device can ensure that the frequency meets the requirement, and the controller comprises the logic device.
The logic device controls the finally generated high voltage signal by controlling the duty ratio of the generated pulse width modulation signal. The logic device may be a microcontroller, a programmable logic gate array, or other programmable logic device. The logic device outputs a target logic signal through programming.
The transformer is a boosting transformer, and the transformer is used for boosting alternating-current voltage by the principle that the turn ratio of a secondary coil to a primary coil is greater than 1.
The rectifier is a rectifier filter that converts the ac signal to dc and filters it to provide a stable dc output.
The power driver comprises a first power driver and a second power driver, the controller is respectively connected with the input ends of the first power driver and the second power driver, and the output ends of the first power driver and the second power driver are respectively connected with the transformer.
In this embodiment, under the driving of the PWM signal generated by the logic device, the first power driver and the second power driver are alternately turned on and off, so that a current is alternately generated in the primary coil of the transformer, and according to the working principle of the transformer, the secondary coil of the transformer obtains an induced current from the primary coil, and since the number of turns of the secondary coil of the transformer is greater than that of the primary coil, a high-voltage output is obtained. It should be noted that this circuit may operate the PWM frequency below 10KHz according to the driving capability of the logic device and the model of the power driver.
The following is a detailed description of a preferred embodiment of another novel digitally controlled high voltage generating circuit provided by the present invention.
As shown in fig. 3 and 4, when the frequency of the pulse width modulation signal is high in the novel numerical control high-voltage generation circuit, the output driving current of the logic device is small, so that the frequency cannot be reached, and at this time, the controller includes the logic device and the gate driver. The gate driver includes a first gate driver and a second gate driver.
The logic device is respectively connected with the input ends of the first grid driver and the second grid driver, the output end of the first grid driver is connected with the first power driver, and the output end of the second grid driver is connected with the second power driver.
The first gate driver and the second gate driver are used for alternately driving the first power driver and the second power driver, and the working frequency of the pulse width modulation signal can be effectively improved.
The grid driver converts the logic level of a common logic device into a powerful source current or sink current for driving the power driver, so that the switching speed is effectively increased, and the higher working frequency is achieved.
The circuit of the gate driver is optional, when the working frequency of the pulse width modulation signal is low, the driving current output by the logic device can ensure that the frequency meets the requirement, and at the moment, the circuit of the gate driver can not be used. When the frequency of the PWM signal is high, the output driving current of the logic device is small, so that the frequency cannot be reached.
The logic device pushes and pulls the first power driver and the second power driver through the grid driver or directly through two paths of pulse width modulation signals generated by the logic device. It should be noted that, as long as the phases of the two pulse width modulation signals generated by the programming control meet the following condition, that is, no dead zone is generated: the duty cycle is less than 1; when the first path of pulse width modulation signal is at a high level, the second path of pulse width modulation signal must be at a low level, and when the second path of pulse width modulation signal is at a high level, the first path of pulse width modulation signal is at a low level, that is, the first path of pulse width modulation signal and the second path of pulse width modulation signal cannot be at high levels at the same time.
Due to the existence of junction capacitance in the power driver, a large source current or sink current is required to obtain a high switching speed, which cannot be provided by a common logic device. The grid driver has the function of converting the logic level of a common logic device into a strong source current or sink current for driving the power driver, so that the switching speed is effectively increased, and the higher working frequency is achieved. In this embodiment, the first gate driver and the second gate driver may quickly convert a logic level of a logic device into a large source current or sink current to be provided to the power driver, so that a switching speed of the power driver is greatly increased, and finally, a working frequency of the pulse width modulation signal exceeds 10KHz to several MHz (the gate driver and the power driver may be matched and selected according to a frequency that needs to be reached).
The following is a detailed description of a preferred embodiment of another novel digitally controlled high voltage generating circuit provided by the present invention.
As shown in fig. 5, the novel digital control high voltage generating circuit further includes an analog-to-digital conversion module, a filter, and a voltage dividing circuit.
The voltage division circuit, the filter, the analog-to-digital conversion module and the controller are sequentially connected, and the input end of the voltage division circuit is connected with the output end of the transformer.
It should be noted that, when the controller includes the logic device, the voltage dividing circuit, the filter, the analog-to-digital conversion module, the logic device, the power driver, the transformer, the rectifier, and the high-voltage output terminal are sequentially connected, where an output terminal of the logic device is connected to the first power driver and the second power driver, respectively, and an input terminal of the voltage dividing circuit is connected to an output terminal of the transformer.
When the controller comprises the logic device and the gate driver, the voltage division circuit, the filter, the analog-to-digital conversion module, the logic device, the gate driver, the power driver, the transformer, the rectifier and the high-voltage output end are sequentially connected, wherein the output end of the logic device is respectively connected with the first gate driver and the second gate driver, the output end of the first gate driver is connected with the input end of the first power driver, the output end of the second gate driver is connected with the input end of the second power driver, and the input end of the voltage division circuit is connected with the output end of the transformer.
The analog-to-digital conversion module converts the analog voltage into a digital signal, and preferably, the analog-to-digital conversion module is an analog-to-digital converter.
The filter is used for filtering interference signals and keeping useful signals, so that the signals are cleaner.
The voltage divider circuit changes a high voltage to a low voltage in a fixed ratio so as to be suitable for digital processing.
In this embodiment, the circuit operation process is as follows: the logic device generates two paths of pulse width modulation signals outputted in a push-pull mode and sends the pulse width modulation signals to the grid driver, the grid driver pushes the first power driver and the second power driver to generate alternating current in a primary coil of a transformer, a secondary coil of the transformer generates alternating current high voltage, the high voltage enters the filter through a voltage division circuit, the filtered signals enter the analog-digital conversion module, the logic device controls the analog-digital conversion module to sample the voltage value after filtering and calculate the high voltage output voltage at the moment, if the high voltage output is lower than the expectation, the duty ratio outputted by the pulse width modulation signals is increased, and if the high voltage output is higher than the expectation, the duty ratio outputted by the pulse width modulation signals is reduced. The process is repeated and operated periodically, so that the dynamic control of the output voltage is realized, and the aims of stabilizing the output voltage and reducing the floating are fulfilled.
The above description is provided for the purpose of illustrating the preferred embodiments of the present invention and will assist those skilled in the art in more fully understanding the technical solutions of the present invention. However, these examples are merely illustrative, and the embodiments of the present invention are not to be considered as being limited to the description of these examples. For those skilled in the art to which the invention pertains, several simple deductions and changes can be made without departing from the inventive concept, and all should be considered as falling within the protection scope of the invention.
Claims (8)
1. A novel numerical control high voltage generating circuit is characterized by comprising a controller, a power driver, a transformer, a rectifier and a high voltage output end,
the controller, the power driver, the transformer, the rectifier and the high-voltage output end are connected in sequence;
the controller includes a logic device and a gate driver.
2. The novel digitally controlled high voltage generating circuit according to claim 1, wherein said logic device is a microcontroller or a programmable logic gate array.
3. The novel digitally controlled high voltage generating circuit of claim 1, wherein said transformer is a step-up transformer.
4. The digitally controlled high voltage generating circuit according to claim 1, wherein said rectifier is a rectifier filter.
5. The novel digital control high voltage generating circuit as claimed in claim 1, wherein the power driver comprises a first power driver and a second power driver,
the controller is respectively connected with the input ends of the first power driver and the second power driver, and the output ends of the first power driver and the second power driver are respectively connected with the transformer.
6. The novel digitally controlled high voltage generating circuit of claim 1, wherein said gate driver comprises a first gate driver and a second gate driver,
the logic device is respectively connected with the input ends of the first grid driver and the second grid driver, the output end of the first grid driver is connected with the first power driver, and the output end of the second grid driver is connected with the second power driver.
7. The novel digital control high voltage generating circuit according to claim 1, further comprising an analog-to-digital conversion module, a filter and a voltage dividing circuit,
the voltage division circuit, the filter, the analog-to-digital conversion module and the controller are sequentially connected, and the input end of the voltage division circuit is connected with the output end of the transformer.
8. The novel digitally controlled high voltage generating circuit of claim 7, wherein said analog to digital conversion module is an analog to digital converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021349567.7U CN212518803U (en) | 2020-07-10 | 2020-07-10 | Novel numerical control high voltage generation circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021349567.7U CN212518803U (en) | 2020-07-10 | 2020-07-10 | Novel numerical control high voltage generation circuit |
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| Publication Number | Publication Date |
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| CN212518803U true CN212518803U (en) | 2021-02-09 |
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| CN202021349567.7U Active CN212518803U (en) | 2020-07-10 | 2020-07-10 | Novel numerical control high voltage generation circuit |
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Effective date of registration: 20240614 Address after: 518000 Room 201, building A, No. 1, Qian Wan Road, Qianhai Shenzhen Hong Kong cooperation zone, Shenzhen, Guangdong (Shenzhen Qianhai business secretary Co., Ltd.) Patentee after: Shenzhen Benniao IOT Technology Co.,Ltd. Country or region after: China Address before: 100193 Hanwang building 257, Zhongguancun Software Park, Shangdi, Haidian District, Beijing Patentee before: Liu Jun Country or region before: China |