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X-ray high voltage device and its operation method

An operation method and high-voltage technology, applied in X-ray equipment, electrical components, etc., can solve the problem of reducing the product of voltage and time, and achieve the effect of preventing large-scale, reducing losses, and suppressing losses

Inactive Publication Date: 2016-08-31
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, for the X-ray high-voltage device of Patent Document 1, the product of the voltage and time output by the inverter is significantly lower than before.

Method used

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  • X-ray high voltage device and its operation method
  • X-ray high voltage device and its operation method

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Effect test

no. 1 approach

[0035] according to figure 1 The following describes the X-ray high voltage device of the first embodiment. figure 1 It is a block diagram of the X-ray high voltage apparatus of 1st Embodiment. figure 2 is the circuit diagram of the boost circuit.

[0036] Such as figure 1 In this way, the X-ray high-voltage apparatus includes a rectifier circuit 10 for rectifying the used power supply, a booster circuit 20 for boosting the rectified voltage, and an inverter for converting the boosted DC voltage into a high-frequency AC voltage. The circuit 30, the high-voltage transformer 40 for boosting the output voltage of the inverter circuit 30, the high-voltage rectification circuit 50 for rectifying the output voltage of the high-voltage transformer, and the direct current applied as the output voltage of the high-voltage rectification circuit 50 An X-ray tube 60 that emits X-rays at a high voltage and a control unit 70 . The X-ray tube 60 includes an anode rotation drive circuit ...

no. 2 approach

[0080] use Figure 7 , Figure 8 Example 2 of the second embodiment will be described. Figure 7 It is a block diagram showing the structure of the X-ray high voltage apparatus of 2nd Embodiment. Figure 8 (a)-(d) are explanatory diagrams which show the signal waveform of each part of an X-ray high voltage apparatus.

[0081] Such as Figure 7 As shown, in the second embodiment, unlike the first embodiment, the tube voltage control circuit 72 and the boost operation control circuit 74 are not synchronized, but the boost operation of the boost operation control circuit 74 is synchronized with the power supply voltage of the commercial power supply. Synchronize. Specifically, as Figure 7 In that way, a commercial voltage detection / synchronization signal generation circuit 175 is disposed instead of the synchronization signal generation circuit 75 of the first embodiment. The commercial voltage detection / synchronization signal generation circuit 175 takes in the voltage of...

no. 3 approach

[0090] In the third embodiment, the first embodiment and the second embodiment are combined, and the step-up circuit is operated at the timing when the DC voltage of the rectifier circuit 10 is equal to or higher than the threshold value during the operation period of the inverter circuit synchronized with the period of the frame rate. 20 moves.

[0091] Such as Figure 9 As shown in (a) to (c), in the configuration of the second embodiment, the booster circuit operation period starts at the timing when the DC voltage of the rectifier circuit 10 becomes equal to or greater than the threshold value Vref1. Such as Figure 9 As in (d), in the configuration of the first embodiment, the inverter circuit operation period and the inverter circuit stop period are alternately repeated at a cycle synchronized with the frame rate, and the period synchronized with the inverter circuit operation period Set as the boost circuit operation period. In the third embodiment, these are combine...

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Abstract

In order to provide an X-ray high voltage apparatus that can reduce power loss and temperature rise in a step-up circuit, a step-up circuit operating period during which the output voltage of a step-up circuit (20) is controlled to match a prescribed step-up voltage, and a step-up circuit stopping period during which the operation of the step-up circuit (20) is stopped are repeated in synchronization with a prescribed timing. For example, an inverter circuit (30) alternately repeats an inverter circuit operating period and an inverter circuit stopping period, and this inverter circuit operating period is made to synchronize with the step-up circuit operating period, and this inverter circuit stopping period is made to synchronize with the step-up circuit stopping period.

Description

technical field [0001] The present invention relates to an X-ray high-voltage device, and more particularly to an X-ray high-voltage device capable of reducing power loss and temperature rise when a tube current is intermittently supplied over a long period of time as in pulse fluoroscopy. Background technique [0002] An X-ray imaging device and an X-ray CT device use an X-ray high voltage device that supplies a direct-current tube voltage / tube current to an X-ray tube and controls the tube voltage / tube current. [0003] In the prior art X-ray high voltage device, for example, as described in Patent Document 1, a DC voltage obtained by rectifying an AC commercial power supply is boosted by a booster circuit, and converted to a high voltage by an inverter circuit. frequency AC voltage. The output voltage of the inverter circuit is transformed by a high-voltage transformer, rectified by a high-voltage rectifier circuit, and supplied to an X-ray tube. The voltage (tube volta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05G1/20H05G1/30
CPCH05G1/10
Inventor 大贯真二郎大久保亮志
Owner HITACHI LTD
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