CN202798464U - Continuously adjustable high voltage power supply stable in output - Google Patents
Continuously adjustable high voltage power supply stable in output Download PDFInfo
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- CN202798464U CN202798464U CN 201220492118 CN201220492118U CN202798464U CN 202798464 U CN202798464 U CN 202798464U CN 201220492118 CN201220492118 CN 201220492118 CN 201220492118 U CN201220492118 U CN 201220492118U CN 202798464 U CN202798464 U CN 202798464U
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Abstract
The utility model provides a continuously adjustable high voltage power supply stable in output. A main loop of the high voltage power supply is formed by sequentially connecting a rectifying and filtering circuit, a voltage reducing transverter, a full bridge inverter, a high-frequency transformer and a voltage doubling rectifying circuit in series. An output sampling circuit connected with the output end of the power supply is respectively connected at the input ends of a first pulse width control circuit and a second pulse width control circuit, the first pulse width control circuit is connected to the control end of the voltage reducing transverter through a first drive circuit, the second pulse width control circuit is connected with the full bridge inverter through a second drive circuit, and an auxiliary power supply circuit is respectively connected with the power supply output end, the first pulse width control circuit, the first drive circuit, the second pulse width control circuit, the first pulse width control circuit and the second drive circuit and provides bias voltage. The continuously adjustable high voltage power supply stable in output overcomes the defects that the high voltage power supply is unstable and large in ripple wave when performs low voltage small-power loading output, really achieves the process from zero adjustment to maximum stable output and meets demands of users.
Description
Technical field
The utility model relates to a kind of supply unit, specifically a kind of stable output and continuously adjustable high voltage source.
Background technology
The output of existing high voltage source when low pressure is stable not, and ripple is larger, and certain work noise is arranged.This is owing to make the pwm circuit that Switching Power Supply adopts.The PWM chip is a kind of pulse width modulator, when output voltage higher, when output current is larger, pulse duration wider (the switching tube ON time that is power supply inside is longer); And when power output hour, pulse duration is narrower (the switching tube ON time that is power supply inside is shorter) just, be subjected to the parameter influences such as power supply internal switch pipe, operating efficiency and power control system stability, this pulse duration can unrestrictedly not narrow down, the excursion of pulse duration (being adjustable range) is only in 10-90% scope the time, and high voltage source can stably be worked.These characteristics have determined the PWM chip and have not been suitable for the so-called continuously adjustable high voltage source of an accent from 0 voltage.
Switching Power Supply that is rated for 500V/5A for example, when its output reached rated value, it is the widest that control impuls reaches, and when output voltage was down to 50V/5A, the width of control impuls had just dropped to 10% of broad pulse.If the output voltage electric current continues to descend, require control impuls to continue to narrow down, be subjected to power supply internal switch pipe, operating efficiency and isoparametric impact of power control system stability, pwm circuit can't satisfy the requirement of the steady operation of high voltage source, at this moment power circuit just becomes the discontinuous operation state, and pulse cuts in and out, thereby power supply inside will make a noise, ripples etc. also can become greatly, and output voltage also wild effect will occur.Under a lot of occasions, higher and output voltage is must zero continuous and stablize adjustable high voltage source to maximum voltage to the high voltage source stability requirement, wild effect can occur in low pressure range.
The utility model content
The purpose of this utility model just provides a kind of stable output and continuously adjustable high voltage source, the unsettled problem of low pressure that exists to solve existing high voltage source.
The utility model is achieved in that a kind of stable output and continuously adjustable high voltage source, includes:
Current rectifying and wave filtering circuit joins with power output end and buck convertor respectively, is used for changing the alternating voltage of input into direct voltage;
Buck convertor joins with described current rectifying and wave filtering circuit, full-bridge inverter and the first drive circuit respectively, is used for the decompression transformation of DC-to-DC, regulates the voltage that is applied to the full-bridge converter supply side;
Full-bridge inverter joins with described buck convertor, the second drive circuit and high frequency transformer respectively, and being used for the direct voltage inversion is high-frequency ac voltage;
High frequency transformer joins with described full-bridge inverter and voltage doubling rectifing circuit respectively, is used for the high-frequency ac voltage of full-bridge inverter output is boosted;
Voltage doubling rectifing circuit is joined with described high frequency transformer and power output end respectively, is used for the voltage of high frequency transformer output is carried out multiplication of voltage, is raised to power supply and exports needed voltage;
Output sampling circuit joins with power output end, the first pulse width control circuit and the second pulse width control circuit respectively, is used for obtaining feedback signal and sending respectively the first pulse width control circuit and the second pulse width control circuit to from power output end;
The first pulse width control circuit joins with described output sampling circuit and the first drive circuit respectively, is used for the size according to electric power output voltage, adjusts the opening and closing time of the switching tube in the buck convertor by the first drive circuit;
The first drive circuit joins with described the first pulse width control circuit and described buck convertor respectively, is used to the switching tube in the buck convertor that corresponding operating current and operating voltage are provided;
The second pulse width control circuit joins with described output sampling circuit and the second drive circuit respectively, is used for the size according to electric power output voltage, adjusts the opening and closing time of each switching tube in the full-bridge inverter by the second drive circuit;
The second drive circuit joins with described the second pulse width control circuit and described full-bridge inverter respectively, is used to this switching tube of full-bridge inverter that corresponding operating current and operating voltage are provided; And
Auxiliary power circuit, join with power output end, the first pulse width control circuit, the first drive circuit, the second pulse width control circuit and the second drive circuit respectively, be used to the first pulse width control circuit, the first drive circuit, the second pulse width control circuit and the second drive circuit that bias voltage is provided.
The utility model also comprises:
Protective circuit is joined with described full-bridge inverter and described the second pulse width control circuit respectively, and being used for providing overheated, overvoltage, overcurrent, arcing and short-circuit protection to high voltage source.
The utility model is compared with existing high voltage source, has set up buck convertor, and uses two pulse width control circuits to control respectively, the pulsewidth of the switching tube in controlled hypotension code converter, the pulsewidth of each switching tube in another control full-bridge inverter.Like this, when high voltage source is in low-voltage output, switching tube in the buck convertor can be transferred to pulsewidth the narrowest automatically, pulsewidth (being duty ratio D) is calculated by 10%, during the input of AC220V civil power, then: Vo=Vin * 1.414 * D=31V that is to say that the supply power voltage of full-bridge circuit only has 31V when low-voltage.Can find out according to the output expression formula Vo=Vin * Ns of full-bridge converter * D/Np, Vin with do not add decompression converter circuit and compared little 10 times, expect same output voltage (because the elementary and secondary number of turn of high frequency transformer is constant), can only regulate duty ratio D, duty ratio D becomes large like this, pulsewidth broadens, and then the output when low pressure just becomes highly stable.And before not increasing buck convertor, the voltage at the switching tube two ends of full-bridge circuit is 311V, thereby causes when low pressure output unstable, and ripple is larger.
The utility model has overcome the defective that high voltage source is unstable when the low pressure low-power load is exported, ripple is larger, realized veritably by the process of acyclic homologically trioial to maximum stable output, satisfied user's demand, made advanced in years the stepping on a new stage of development of high voltage source.
Description of drawings
Fig. 1 is circuit structure block diagram of the present utility model.
Embodiment
As shown in Figure 1, the major loop of this high voltage source is to be composed in series successively by current rectifying and wave filtering circuit, buck convertor, full-bridge inverter, high frequency transformer and voltage doubling rectifing circuit, the input of current rectifying and wave filtering circuit is power input, and the output of voltage doubling rectifing circuit is power output end.
The output sampling circuit that joins with power output end is connected to the input of the first pulse width control circuit and the second pulse width control circuit, obtaining feedback signal from power output end, and transmits to the first pulse width control circuit and the second pulse width control circuit simultaneously.The first pulse width control circuit is connected to the control end of buck convertor by the first drive circuit, with the size according to electric power output voltage, adjusts the opening and closing time of the switching tube in the buck convertor, namely adjusts the output pulse width of buck convertor.The second pulse width control circuit joins by the second drive circuit and full-bridge inverter, with the size according to electric power output voltage, adjusts the opening and closing time of each switching tube in the full-bridge inverter, namely adjusts the output pulse width of full-bridge inverter.
Auxiliary power circuit joins with power output end, the first pulse width control circuit, the first drive circuit, the second pulse width control circuit and the second drive circuit respectively, for the integrated circuit (IC) chip in the first pulse width control circuit, the first drive circuit, the second pulse width control circuit and the second drive circuit provides bias voltage, guarantee the normal operation of above-mentioned each circuit.
In this high voltage source, also be provided with protective circuit; protective circuit is joined with full-bridge inverter and the second pulse width control circuit respectively; make this high voltage source have the defencive functions such as overheated, overvoltage, overcurrent, arcing, short circuit, can protect in time subscriber equipment and high voltage source itself not to be damaged.
Claims (2)
1. a stable output and continuously adjustable high voltage source is characterized in that, include:
Current rectifying and wave filtering circuit joins with power output end and buck convertor respectively, is used for changing the alternating voltage of input into direct voltage;
Buck convertor joins with described current rectifying and wave filtering circuit, full-bridge inverter and the first drive circuit respectively, is used for the decompression transformation of DC-to-DC, regulates the voltage that is applied to the full-bridge converter supply side;
Full-bridge inverter joins with described buck convertor, the second drive circuit and high frequency transformer respectively, and being used for the direct voltage inversion is high-frequency ac voltage;
High frequency transformer joins with described full-bridge inverter and voltage doubling rectifing circuit respectively, is used for the high-frequency ac voltage of full-bridge inverter output is boosted;
Voltage doubling rectifing circuit is joined with described high frequency transformer and power output end respectively, is used for the voltage of high frequency transformer output is carried out multiplication of voltage, is raised to power supply and exports needed voltage;
Output sampling circuit joins with power output end, the first pulse width control circuit and the second pulse width control circuit respectively, is used for obtaining feedback signal and sending respectively the first pulse width control circuit and the second pulse width control circuit to from power output end;
The first pulse width control circuit joins with described output sampling circuit and the first drive circuit respectively, is used for the size according to electric power output voltage, adjusts the opening and closing time of the switching tube in the buck convertor by the first drive circuit;
The first drive circuit joins with described the first pulse width control circuit and described buck convertor respectively, is used to the switching tube in the buck convertor that corresponding operating current and operating voltage are provided;
The second pulse width control circuit joins with described output sampling circuit and the second drive circuit respectively, is used for the size according to electric power output voltage, adjusts the opening and closing time of each switching tube in the full-bridge inverter by the second drive circuit;
The second drive circuit joins with described the second pulse width control circuit and described full-bridge inverter respectively, is used to this switching tube of full-bridge inverter that corresponding operating current and operating voltage are provided; And
Auxiliary power circuit, join with power output end, the first pulse width control circuit, the first drive circuit, the second pulse width control circuit and the second drive circuit respectively, be used to the first pulse width control circuit, the first drive circuit, the second pulse width control circuit and the second drive circuit that bias voltage is provided.
2. stable output according to claim 1 and continuously adjustable high voltage source is characterized in that, also comprise:
Protective circuit is joined with described full-bridge inverter and described the second pulse width control circuit respectively, and being used for providing overheated, overvoltage, overcurrent, arcing and short-circuit protection to high voltage source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220492118 CN202798464U (en) | 2012-09-25 | 2012-09-25 | Continuously adjustable high voltage power supply stable in output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220492118 CN202798464U (en) | 2012-09-25 | 2012-09-25 | Continuously adjustable high voltage power supply stable in output |
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| Publication Number | Publication Date |
|---|---|
| CN202798464U true CN202798464U (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220492118 Expired - Fee Related CN202798464U (en) | 2012-09-25 | 2012-09-25 | Continuously adjustable high voltage power supply stable in output |
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| Country | Link |
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| CN (1) | CN202798464U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178743A (en) * | 2013-04-10 | 2013-06-26 | 浙江大学 | Double-boosting high-voltage pulse power supply |
| CN104617778A (en) * | 2015-02-10 | 2015-05-13 | 兰州空间技术物理研究所 | Low-current output high-voltage power supply circuit wide in input voltage range and high in load regulation rate |
| CN105024583A (en) * | 2014-04-25 | 2015-11-04 | 常州大控电子科技有限公司 | Constant voltage output pulsed power supply with duty ratio adjustable range being 20%-80% |
| CN108499739A (en) * | 2017-09-30 | 2018-09-07 | 江森自控空调冷冻设备(无锡)有限公司 | The method of high-voltage power circuit, high-voltage electricity source plate and control high tension voltage output |
-
2012
- 2012-09-25 CN CN 201220492118 patent/CN202798464U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178743A (en) * | 2013-04-10 | 2013-06-26 | 浙江大学 | Double-boosting high-voltage pulse power supply |
| CN103178743B (en) * | 2013-04-10 | 2015-06-10 | 浙江大学 | Double-boosting high-voltage pulse power supply |
| CN105024583A (en) * | 2014-04-25 | 2015-11-04 | 常州大控电子科技有限公司 | Constant voltage output pulsed power supply with duty ratio adjustable range being 20%-80% |
| CN104617778A (en) * | 2015-02-10 | 2015-05-13 | 兰州空间技术物理研究所 | Low-current output high-voltage power supply circuit wide in input voltage range and high in load regulation rate |
| CN108499739A (en) * | 2017-09-30 | 2018-09-07 | 江森自控空调冷冻设备(无锡)有限公司 | The method of high-voltage power circuit, high-voltage electricity source plate and control high tension voltage output |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20160925 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |