High-voltage power supply device
The high-voltage power supply device addresses the lack of closed-loop control by using a feedback control mechanism to stabilize output voltage, ensuring accurate and efficient operation of electronic devices under test without requiring isolation control chips for ultra-high voltages.
Patent Information
- Application Number
- TW113146061
- Authority / Receiving Office
- TW · TW
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2026-07-11
- Estimated Expiration
- 2044-11-27
AI Technical Summary
Current high-voltage power supplies in the industry lack closed-loop control due to the inability of commercially available isolation control chips to handle ultra-high operating voltages, leading to poor voltage regulation and potential energy loss or malfunction of electronic devices under test.
A high-voltage power supply device with a feedback control mechanism that adjusts output voltage through a feedback control module, integrating a voltage isolation module, adjustable power supply module, DC-AC conversion module, and transformer module to stabilize voltage at the output end without relying on isolation control chips for ultra-high voltages.
Enables precise voltage stabilization at the output end, preventing device malfunctions and energy waste by dynamically adjusting output voltage based on feedback control, even in the absence of isolation control chips capable of handling ultra-high voltages.
Smart Images
Figure IMG-2_DRAW_04_IMAGE001
Abstract
Description
Technical Field
[0001] This invention relates to a power supply device, and more particularly to a high-voltage power supply device capable of feedback control. Prior Technology
[0002] To test electronic devices operating at extremely high voltages, specialized high-voltage power supplies are required because conventional power supplies cannot provide sufficient high voltage. However, current high-voltage power supplies in the industry cannot employ closed-loop control because commercially available isolation control chips cannot handle the extremely high operating voltage feedback. Therefore, given that commercially available isolation control chips cannot withstand extremely high operating voltages, high-voltage power supplies used in the industry can only employ open-loop control.
[0003] In practice, the open-loop controlled high-voltage power supplies currently used in the industry have poor voltage regulation at the output end. As those skilled in the art will understand, if the output voltage of the high-voltage power supply is lower than the ultra-high operating voltage required by the electronic device under test (DUT), the DUT will malfunction and malfunction. To ensure the DUT receives the required ultra-high operating voltage, the high-voltage power supply must provide an output voltage significantly higher than the ultra-high operating voltage. However, receiving an additional voltage exceeding the ultra-high operating voltage will cause energy loss, waste heat, or other problems, affecting the test results. Therefore, the industry needs a new high-voltage power supply that can provide voltage regulation at the output end, even when isolation control chips cannot directly handle ultra-high operating voltages. Summary of the Invention
[0004] This invention provides a high-voltage power supply device that can automatically adjust the output voltage to achieve a closed-loop control voltage stabilization effect.
[0005] This invention proposes a high-voltage power supply device, comprising a voltage isolation module, an adjustable voltage power supply module, a DC-AC conversion module, a transformer module, and a feedback control module. The adjustable voltage power supply module is electrically connected to the voltage isolation module and is controlled by a voltage feedback signal to adjust the DC reference voltage. The DC-AC conversion module is electrically connected to the adjustable voltage power supply module and converts the DC reference voltage into a low-voltage AC signal according to a control signal. The transformer module is electrically connected to the DC-AC conversion module and converts the low-voltage AC signal into multiple high-voltage AC signals, and then converts these multiple high-voltage AC signals into multiple DC output voltages. The feedback control module is electrically connected between the transformer module and the adjustable voltage power supply module and detects the voltage difference between two selected DC output voltages, compares the voltage difference with a preset threshold value, and generates a voltage feedback signal accordingly. The two selected DC output voltages are the positive and negative voltages supplied to the output terminal of the high-voltage power supply device.
[0006] In some embodiments, when the feedback control module determines that the voltage difference is greater than a preset threshold value, the voltage feedback signal can control the adjustable power supply module to reduce the DC reference voltage; when the feedback control module determines that the voltage difference is less than the preset threshold value, the voltage feedback signal can control the adjustable power supply module to increase the DC reference voltage. Furthermore, the voltage isolation module is electrically connected to the power supply module, and the voltage isolation module can be used to convert the supply voltage provided by the power supply module into a DC reference voltage. Additionally, the power supply module can be used to convert AC power into a DC supply voltage.
[0007] In some embodiments, the feedback control module may include a voltage detection unit and a voltage comparison unit. The voltage detection unit can sample the voltages of two DC output voltages, obtain the voltage difference between the two DC output voltages, and the voltage comparison unit can compare the voltage difference with a preset threshold value to generate a voltage feedback signal. Furthermore, in the plurality of high voltage ranges, the voltage difference between the two DC output voltages exceeds two kilovolts. Additionally, the control signal may be provided by a control chip.
[0008] In summary, the high-voltage power supply device provided by the present invention can use a feedback control module to control the DC reference voltage provided by the adjustable power supply module, thereby enabling the high-voltage power supply device to still have a voltage stabilization effect at the output end even in the absence of an isolation control chip that can directly handle ultra-high operating voltage. Simple Explanation of the Diagram
[0009] Figure 1 is a functional block diagram illustrating a high-voltage power supply device according to an embodiment of the present invention. Implementation
[0010] The features, objectives, and functions of this invention will be further disclosed below. However, the following descriptions are merely embodiments of this invention and should not be construed as limiting the scope of the invention. Any equivalent changes and modifications made within the scope of the claims of this invention will not deviate from the essence of the invention and will not depart from the spirit and scope of the invention. Therefore, they should be considered as further embodiments of this invention.
[0011] Please refer to Figure 1, which is a functional block diagram illustrating a high-voltage power supply device according to an embodiment of the present invention. As shown in Figure 1, the high-voltage power supply device 1 may include a power supply module 10, a voltage isolation module 11, an adjustable voltage power supply module 12, a DC / AC conversion module 13, a transformer module 14, a feedback control module 15, and an output terminal 16. In terms of electrical connection, the voltage isolation module 11 is electrically connected between the power supply module 10 and the adjustable voltage power supply module 12, and the DC / AC conversion module 13 is electrically connected between the adjustable voltage power supply module 12 and the transformer module 14. Furthermore, the feedback control module 15 is electrically connected to both the adjustable voltage power supply module 12 and the transformer module 14, and the transformer module 14 is electrically connected to the output terminal 16. The functions of the above components will be described below.
[0012] The power supply module 10 can be electrically connected to the mains power supply terminal, and the power supply module 10 can convert the mains power to a DC supply voltage. In practice, the power supply module 10 can be a power supply unit, and the mains power can be, for example, common AC mains specifications such as 110V or 220V, and the power supply module 10 can convert the mains power to, for example, 48V DC as the supply voltage. This embodiment is not limited to this. In addition, the other side of the power supply module 10 can be electrically connected to a voltage isolation module 11, which can include components such as a full-bridge filter and a synchronous rectifier. In one example, the main function of the voltage isolation module 11 is to isolate the circuits on both sides, so that the voltage input to the voltage isolation module 11 will be approximately equal to the voltage output from the voltage isolation module 11 (DC reference voltage). In other words, the voltage isolation module 11 can receive 48V DC (supply voltage) and output 48V DC (DC reference voltage) to feed into the adjustable power supply module 12. Of course, this embodiment does not limit the magnitude of the power supply voltage and the DC reference voltage. Those skilled in the art can freely adjust the power supply voltage and the DC reference voltage as required by the specifications.
[0013] In addition to receiving the DC reference voltage output from the voltage isolation module 11, the adjustable power supply module 12 also receives a voltage feedback signal from the feedback control module 15, and adjusts the aforementioned DC reference voltage according to the voltage feedback signal. In practice, the adjustable power supply module 12 can be a four-switch buck-boost circuit, which can be used to freely adjust the DC reference voltage, raising or lowering it. The DC-AC conversion module 13 receives the DC reference voltage provided by the adjustable power supply module 12 and can be used to convert it into an AC signal. For example, the DC-AC conversion module 13 can include a full-bridge inverter, which can be controlled by a control chip 17. The control chip 17 can be used to provide control signals (e.g., a pulse width modulation (PWM) signal) to the full-bridge inverter, which, as will be understood by those skilled in the art, can cause the full-bridge inverter to simulate the positive and negative changes of AC power. Accordingly, in this embodiment, the AC signal converted from the DC reference voltage by the DC-AC conversion module 13 is referred to as the AC low-voltage signal. It is worth noting that the control chip 17 used in this embodiment is not exposed to high voltage, so even though there is a lack of isolated control chips on the market that can directly handle ultra-high operating voltages, this embodiment can still maintain normal operation for a long time.
[0014] Transformer module 14 is electrically connected to DC-AC converter module 13, and is used to transform the AC low-voltage signal. In practice, transformer module 14 can transform the AC low-voltage signal into multiple AC high-voltage signals with different voltage ranges, and convert these AC high-voltage signals into corresponding multiple DC output voltages. For example, the multiple DC output voltages may include values such as ±0.6kV, ±1.2kV, ±1.9kV, and ±3.4kV, etc., which are not limited in this embodiment. In one example, transformer module 14 in this embodiment includes a full-wave voltage multiplier circuit (full-wave CWVM), which can generate the above-mentioned multiple DC output voltage values. The voltage values include both positive and negative values, meaning that transformer module 14 in this embodiment does not need to provide a transformer and half-wave voltage multiplier circuit (which can only provide positive or negative values) for each voltage value to be generated, thereby simplifying the architecture of the high-voltage circuit.
[0015] In one example, output terminal 16 can selectively provide two of the plurality of DC output voltages, which can be used as the operating voltage for the electronic device under test (DUT). Generally, the electronic device referred to here can be a high-voltage semiconductor testing device, which has corresponding specifications indicating the appropriate operating voltage. For example, if the operating voltage should be ±3.4kV, then output terminal 16 can selectively provide +3.4kV and -3.4kV DC output voltages to the DUT. In practice, output terminal 16 can be electrically connected to the operational amplifier of the DUT. Unlike traditional high-voltage power supplies that control the operational amplifier's operating voltage in an open-loop manner, which can lead to inaccurate voltage supply, this embodiment also includes a feedback control module 15. The feedback control module 15 can track and control the two DC output voltages (or the operating voltages received by the operational amplifier) output by output terminal 16. The working principle of the feedback control module 15 is explained below.
[0016] The feedback control module 15 can be used to detect the voltage difference between two selected DC output voltages and compare the voltage difference with a preset threshold value to generate a voltage feedback signal. In one example, the feedback control module 15 may include a voltage detection unit 150 and a voltage comparison unit 151. The voltage detection unit 150 is electrically connected to the output terminal 16 and the voltage comparison unit 151, respectively, and the voltage comparison unit 151 is also electrically connected to the adjustable power supply module 12. In practice, the voltage detection unit 150 samples two DC output voltages, such as the aforementioned ±3.4kV. At this time, the voltage detection unit 150 can obtain the voltage difference between the two DC output voltages, for example, 6.8kV. Furthermore, the voltage comparison unit 151 can compare the voltage difference with a preset threshold value to generate a voltage feedback signal.
[0017] For example, if the preset threshold value is set to 6.8kV, and the voltage difference actually measured by the voltage detection unit 150 is less than 6.8kV, then the voltage comparison unit 151 can determine that the voltage difference is less than the preset threshold value, thereby generating a corresponding voltage feedback signal. In practice, this voltage feedback signal is used to instruct the adjustable power supply module 12 to increase the DC reference voltage slightly. Similarly, if the preset threshold value is set to 6.8kV, and the voltage difference actually measured by the voltage detection unit 150 is greater than 6.8kV, then the voltage comparison unit 151 can determine that the voltage difference is greater than the preset threshold value, thereby generating a corresponding voltage feedback signal. In practice, this voltage feedback signal is used to instruct the adjustable power supply module 12 to decrease the DC reference voltage slightly.
[0018] As will be understood by those skilled in the art, the feedback control module 15 may also determine how to control the adjustable power supply module 12 based on the difference between the voltage difference and a preset threshold value. For example, if the voltage difference is only slightly less than the preset threshold value, the voltage feedback signal may instruct the adjustable power supply module 12 to slightly increase the DC reference voltage. Conversely, if the voltage difference is significantly less than the preset threshold value, the voltage feedback signal may instruct the adjustable power supply module 12 to significantly increase the DC reference voltage.
[0019] In other words, assuming the feedback control module 15 determines that the actual measured voltage difference is less than a preset threshold value, the voltage feedback signal will instruct the adjustable power supply module 12 to increase the DC reference voltage. Then, the DC-AC conversion module 13 receives the increased DC reference voltage, and the voltage of the resulting AC power (AC low-voltage signal) will also increase accordingly. Correspondingly, when the transformer module 14 transforms the increased AC low-voltage signal into multiple sets of AC high-voltage signals with different voltage ranges, the voltage range of these AC high-voltage signals will also increase. Therefore, when the transformer module 14 converts these increased AC high-voltage signals into corresponding multiple DC output voltages, the resulting multiple DC output voltages will also increase accordingly. It is worth noting that the voltage increase referred to here is an increase in the absolute value of the voltage, for example, ±3.4kV increasing to ±3.5kV, not ±3.4kV becoming +3.5kV and -3.3kV.
[0020] Similarly, assuming the feedback control module 15 determines that the actual measured voltage difference is greater than a preset threshold value, the voltage feedback signal will instruct the adjustable power supply module 12 to reduce the DC reference voltage. Then, the DC-AC conversion module 13 receives the reduced DC reference voltage, and the voltage of the converted AC power (AC low-voltage signal) will also decrease accordingly. Correspondingly, when the transformer module 14 transforms the reduced AC low-voltage signal into multiple sets of AC high-voltage signals with different voltage ranges, the voltage range of these AC high-voltage signals will also decrease. Therefore, when the transformer module 14 converts these reduced AC high-voltage signals into corresponding multiple DC output voltages, the resulting multiple DC output voltages will also decrease accordingly. It is worth noting that the voltage decrease referred to here is a decrease in the absolute value of the voltage, for example, ±3.4kV decreasing to ±3.3kV, not ±3.4kV becoming +3.3kV and -3.5kV. That is to say, in this embodiment, the voltage increase refers to the increase of the aforementioned voltage difference, while the voltage decrease refers to the decrease of the aforementioned voltage difference.
[0021] In summary, the high-voltage power supply device provided by this invention integrates feedback control between the adjustable power supply module and the output terminal. Instead of directly feeding high voltage feedback into the isolation control chip, the feedback control module controls the DC reference voltage provided by the adjustable power supply module. Therefore, this invention eliminates the need for an isolation control chip to directly handle ultra-high operating voltages, while still enabling voltage stabilization at the output terminal using the feedback control module.
[0022] 1: High-voltage power supply device 10: Power Supply Module 11: Voltage isolation module 12: Adjustable power supply module 13: DC-AC converter module 14: Transformer Module 15: Feedback Control Module 150: Voltage Detection Unit 151: Voltage Comparison Unit 16: Output terminal 17: Control chip
[0023] none
Claims
1. A high-voltage power supply device, comprising: a voltage isolation module; an adjustable power supply module electrically connected to the voltage isolation module and controlled by a voltage feedback signal to adjust a DC reference voltage; a DC-AC conversion module electrically connected to the adjustable power supply module, which converts the DC reference voltage into an AC low-voltage signal according to a control signal; a transformer module electrically connected to the DC-AC conversion module, which converts the AC low-voltage signal into a plurality of AC high-voltage signals and converts the AC high-voltage signals into a plurality of DC output voltages; and a feedback control module electrically connected between the transformer module and the adjustable power supply module, which detects a voltage difference between two selected DC output voltages and compares the voltage difference with a preset threshold value to generate the voltage feedback signal; wherein the two selected DC output voltages are a positive voltage and a negative voltage supplied to an output terminal of the high-voltage power supply device; and wherein the voltage difference between the two DC output voltages exceeds two kilovolts.
2. The high-voltage power supply device as described in claim 1, wherein when the feedback control module determines that the voltage difference is greater than the preset threshold value, the voltage feedback signal controls the adjustable power supply module to reduce the DC reference voltage; when the feedback control module determines that the voltage difference is less than the preset threshold value, the voltage feedback signal controls the adjustable power supply module to increase the DC reference voltage.
3. The high-voltage power supply device as claimed in claim 1, wherein the voltage isolation module is electrically connected to a power supply module, and the voltage isolation module is used to convert a power supply voltage provided by the power supply module into the DC reference voltage.
4. The high-voltage power supply device as described in claim 3, wherein the power supply module is used to convert an AC power supply voltage into a DC power supply voltage.
5. The high-voltage power supply device as claimed in claim 1, wherein the feedback control module includes a voltage detection unit and a voltage comparison unit, the voltage detection unit is used to sample two DC output voltages, the voltage detection unit obtains the voltage difference between the two DC output voltages, and the voltage comparison unit compares the voltage difference with the preset threshold value to generate the voltage feedback signal.
6. The high-voltage power supply device as described in claim 1, wherein the control signal is provided by a control chip.