WO2012059963A1 - 電源ノイズ低減回路及び電源ノイズ低減方法 - Google Patents
電源ノイズ低減回路及び電源ノイズ低減方法 Download PDFInfo
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- WO2012059963A1 WO2012059963A1 PCT/JP2010/006657 JP2010006657W WO2012059963A1 WO 2012059963 A1 WO2012059963 A1 WO 2012059963A1 JP 2010006657 W JP2010006657 W JP 2010006657W WO 2012059963 A1 WO2012059963 A1 WO 2012059963A1
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- power supply
- resistor
- noise reduction
- voltage
- supply noise
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/005—Gas-filled discharge tubes with solid cathode specially adapted as noise generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W2050/0001—Details of the control system
- B60W2050/0043—Signal treatments, identification of variables or parameters, parameter estimation or state estimation
- B60W2050/0052—Filtering, filters
- B60W2050/0054—Cut-off filters, retarders, delaying means, dead zones, threshold values or cut-off frequency
- B60W2050/0056—Low-pass filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present invention relates to a power supply noise reduction circuit and a power supply noise reduction method for reducing noise included in a constant voltage output outputted from a power supply to a load.
- a power supply noise reduction circuit for reducing noise included in a constant voltage output output from a power supply to a semiconductor device has been put into practical use.
- Such a power supply noise reduction circuit is roughly classified into a passive low-pass filter composed of only passive elements and an active low-pass filter composed of active elements.
- bypass capacitor As a passive filter, a combination of a so-called bypass capacitor and a choke coil is generally used.
- the bypass capacitor is configured to include a capacitor (AC shunt circuit) connected in parallel with the load.
- AC shunt circuit By holding the impedance of the capacitor against the noise signal at a low value, the capacitor bypasses the noise current, and the load This suppresses the inflow of noise to the
- the choke coil prevents noise current from passing through by inserting it in series with the power line from the constant voltage source to the load, and further reduces the noise voltage by the ratio between the series impedance of the power line and the parallel impedance of the bypass capacitor. By dividing the voltage and increasing the impedance ratio, the noise suppression effect is enhanced, thereby suppressing the noise application to the load.
- a filter circuit using an operational amplifier is generally used as a constant voltage source as an active filter.
- a constant voltage stabilization circuit usually serves as a filter. Fulfill.
- the filter circuit inserted into the power supply line outside the power supply is also a so-called dropper-type simple constant voltage, such as a three-terminal regulator or shunt regulator, for voltage conversion with voltage step-down and DC voltage stabilization including ripple removal.
- a power supply circuit is generally used, and noise can be reduced as a secondary effect of constant voltage stabilization accompanied by voltage step-down (see, for example, Patent Document 1).
- the lower the noise frequency the smaller the inductive reactance becomes, so the noise suppression effect of the filter becomes smaller.
- Inserting a resistor whose impedance does not depend on frequency in series with the coil can improve the suppression effect in the low frequency range, but there are new problems such as voltage drop with respect to the power supply voltage and power loss and heat generation due to the resistor. Therefore, it is difficult to use a large resistance value in order to improve the amount of low-frequency noise improvement, and there is a problem that a sufficient noise reduction effect cannot be obtained after all.
- the power supply voltage is stabilized with a voltage drop to reduce noise secondary. Since the voltage can be supplied only to the load (voltage lower than the power supply voltage), and the voltage supplied from the power supply cannot be supplied to the load as it is, for example, a power supply with a programmable voltage value of constant voltage output When it is desired to supply a desired power supply voltage to the load using the circuit, there is a problem that the circuit cannot be applied.
- the present invention has been made in view of such a conventional problem, and it is not necessary to increase the size of a circuit element, and does not cause a voltage drop of a power supply voltage.
- the purpose is to provide.
- the present invention is a power supply noise reduction circuit for reducing noise included in a constant voltage output output from a power supply to a load, A first resistor inserted in a power line extending from a power source to the load; a low-pass filter connected to a load end of the first resistor and outputting a first voltage with reduced noise from the constant voltage output; and the low-pass filter A unity gain amplifier that drives the first voltage output by the filter and outputs the first voltage to a load terminal of the first resistor.
- the low-pass filter is configured by connecting a second resistor and a capacitor in series.
- the present invention according to claim 3 is the present invention according to claim 2, further comprising filter switching means for switching a bypass path for bypassing the second resistor.
- the present invention according to claim 4 is the present invention according to claim 2 or 3, further comprising a third resistor for reducing an input voltage to the unity gain amplifier by dividing the voltage with the second resistor.
- the amplifier switching means for switching on and off the output path from the unity gain amplifier to the load end of the first resistor. Is provided.
- the present invention according to claim 6 is a power supply noise reduction method for reducing the noise via a power supply noise reduction circuit for reducing noise included in a constant voltage output output from a power supply to a load.
- the power supply noise reduction circuit is connected to a first resistor inserted in a power supply line from the power supply to the load, and a load terminal of the first resistor, and a first voltage that reduces the noise from the constant voltage output.
- a low-pass filter configured by connecting a second resistor and a capacitor in series, and driving the first voltage output from the low-pass filter to a load end of the first resistor.
- the power supply noise reduction circuit switches the on / off of the output path from the unity gain amplifier to the load end of the first resistor.
- the output path is turned off via the amplifier switching means, and in the connection step, the output path is turned on via the amplifier switching means.
- the power supply noise reduction circuit by driving the first voltage via the unity gain amplifier, noise can be reduced without causing a voltage drop of the power supply voltage, and the voltage supplied from the power supply Can be supplied to the load as it is, for example, even when a desired power supply voltage is supplied to the load using a power supply with programmable constant voltage output, the power supply noise reduction circuit can be applied. Become.
- the low-pass filter is configured by connecting the second resistor and the capacitor in series, the low-pass filter can be easily configured.
- the third aspect of the present invention it is possible to quickly and easily switch the power supply noise reduction circuit by bypassing the second resistor by the filter switching means. It is possible to start the power supply noise reduction circuit at an arbitrary time when supply is necessary, and to stop the power supply noise reduction circuit at an arbitrary time when supply of power is no longer necessary.
- the third resistor for lowering the input voltage to the unity gain amplifier is provided by dividing the voltage with the second resistor, the power supply for the constant voltage output of the power supply is provided.
- the constant voltage output of the noise reduction circuit is slightly lower, which prevents power from being supplied from the unity gain amplifier to the load.
- the unity gain amplifier has almost no power burden and should be supplied with power to absorb noise power. That's fine.
- the output of the unity gain amplifier is turned off by the amplifier switching means when the constant voltage power source rises or falls, so that the voltage of the constant voltage power source and the unity gain amplifier are switched off. It is possible to prevent current generation due to the output voltage difference.
- the second resistor before the power supply is turned on, the second resistor is bypassed, and after the power supply is turned on and the capacitor is immediately charged, the second resistor is connected.
- the power supply noise reduction circuit can be started almost at the same time as the power is turned on, and the power supply noise reduction circuit is started at any time when power supply with low noise is required. The power supply noise reduction circuit can be stopped.
- the seventh aspect of the present invention before the power supply is turned on, driving of the power supply line by the unity gain amplifier is stopped, the power supply is turned on to charge the capacitor, and the output voltage of the unity gain amplifier is Becomes equal to the output voltage of the power supply line, and after the power supply noise reduction circuit is started, the unity gain amplifier starts driving the power supply line.
- the constant voltage power supply rise and fall times can be made the same as without the power supply noise reduction circuit.
- FIG. 1 is a block diagram of a constant voltage power supply circuit including a power supply noise reduction circuit according to an embodiment of the present invention. It is a flowchart of a power supply noise reduction process.
- FIG. 3 is a graph showing the result of analyzing the noise from the output terminal by a spectrum analyzer.
- A is the analysis result when the power supply noise reduction circuit is turned off, and
- B is the power supply noise reduction circuit. Is an analysis result when the power supply noise reduction circuit is turned on, and is an analysis result when the first capacitor having a capacity different from that of FIG. Show.
- the power supply noise reduction circuit and the power supply noise reduction method according to this embodiment are for reducing noise included in a constant voltage output output from a power supply to a load.
- the power supply noise reduction circuit includes a circuit that is configured independently of various devices and circuits such as a constant voltage power supply device, and that that is incorporated in these various devices and circuits. The latter case corresponds to, for example, a case where a low noise constant voltage power supply device is configured as a whole by incorporating a power supply noise reduction circuit into the content of the constant voltage power supply device.
- the power supply noise reduction circuit may be configured to operate in cooperation with other devices. For example, control of active elements included in the power supply noise reduction circuit may be controlled by an external control device. Good.
- the specific configuration of the power supply is arbitrary, and includes, for example, DPS (Device Power Supply). Further, the specific configuration of the load is arbitrary, but in particular, a device that requires a low power supply noise level (for example, a semiconductor device for audio use) is applicable.
- DPS Device Power Supply
- the specific configuration of the load is arbitrary, but in particular, a device that requires a low power supply noise level (for example, a semiconductor device for audio use) is applicable.
- a power supply noise reduction circuit is provided in a power supply circuit incorporated in the semiconductor tester, and an active element of the power supply noise reduction circuit (specifically, Describes a case in which a first relay and a second relay described later are controlled by a control unit provided inside the semiconductor tester.
- FIG. 1 is a block diagram of a power supply circuit including a power supply noise reduction circuit according to the present embodiment.
- the power supply circuit 1 shown in FIG. 1 includes a power supply 2, an output terminal (AVDD terminal) 3, a GND terminal 4, a first capacitor 5, and a power supply noise reduction circuit (Active Noise Suppressor) 10.
- AVDD terminal an output terminal
- GND terminal a GND terminal
- first capacitor 5 a capacitor
- a power supply noise reduction circuit Active Noise Suppressor
- the power source 2 supplies DC power to the load, and here is configured as a DPS.
- the positive electrode of the power supply 2 is connected to the output terminal 3 via the power supply line L 1, and power is supplied to the load via the output terminal 3.
- the negative electrode of the power source 2 is connected to the GND terminal 4 via the GND line L2.
- Monitor lines L3 and L4 are connected to the power supply line L1 and the GND line L2, respectively.
- the monitor lines L3 and L4 are connected to the power supply 2, and the monitor voltage supplied from the power supply 2 is monitored by the monitor lines L3 and L4. Is fed back to the power source 2 through the above, and known feedback power source control is performed.
- the first capacitor 5 is inserted in a line L5 connecting the power supply line L1 and the GND line L2, and constitutes a series RC circuit together with a first resistor 20 described later of the power supply noise reduction circuit 10.
- the power supply noise reduction circuit 10 is for reducing noise supplied from the power supply 2 to the load.
- the power supply noise reduction circuit 10 includes a first resistor 20, a main circuit 30, and a drive power supply 50. .
- the first resistor 20 is inserted into the power supply line L1, and in the state where the power supply noise reduction circuit 10 is switched off, the first resistor 5 is configured with the first capacitor 5 as described above to form the power supply noise. In a state where the reduction circuit 10 is switched on, noise reduction is performed in cooperation with a low-pass filter 31 described later.
- the main circuit 30 is inserted into a line L6 connecting the power supply line L1 and the GND line L2, and includes a low-pass filter 31, a unity gain amplifier 32, and a third resistor 33.
- the main circuit 30 is modularized into one chip, and includes a PF terminal 34, a GF terminal 35, an UP5V terminal 36, a CHG terminal 37, an OUT terminal 38, a + PW terminal 39, and a -PW terminal 40.
- lines connecting these terminals 34 to 40 are outlines of the main circuit 30 formed into one chip.
- the low-pass filter 31 is connected to the load end of the first resistor 20 with high impedance and outputs a first voltage with reduced noise from a constant voltage output.
- the low-pass filter 31 includes a second resistor 41 and a second capacitor. 42 is connected in series.
- the values of the second resistor 41 and the second capacitor 42 are set so that the time constant of the low-pass filter 31 is as large (long) as possible.
- a bypass path L7 for bypassing the second resistor 41 is connected to both ends of the second resistor 41.
- the bypass path L7 is connected to a second path for switching the bypass path L7 between connection and disconnection.
- One relay (filter switching means) 43 is provided.
- the first relay 43 is driven by a control signal input to the CHG terminal 37 from a control unit provided inside the semiconductor tester, and when the bypass path L7 is switched to connection (short circuit), the second resistance 41 Is in a bypass state (non-use state), and when the bypass path L7 is switched to a non-connection (disconnection), the second resistor 41 is in a non-bypass state (use state).
- the driving power for the first relay 43 is supplied via the UP5V terminal 36.
- the unity gain amplifier 32 drives the first voltage V1 output from the low-pass filter 31 with a low impedance and outputs the first voltage V1 to the load end of the first resistor 20.
- the input end of the unity gain amplifier 32 is connected to the second resistor 41.
- the second capacitors 42 are connected to each other, and their output ends are connected to the load end of the second resistor 41 via the output path L8.
- the output path L8 is provided with a second relay (amplifier switching means) 44 for switching the output path L8 between connection and disconnection.
- the second relay 44 is driven by a control signal input to the OUT terminal 38 from a control unit provided inside the semiconductor tester, and when the output path L8 is switched to connection (short circuit), the unity gain amplifier 32 is used. Is output to the load end of the second resistor 41, and the output path L8 is switched to non-connected (disconnected), the output of the unity gain amplifier 32 to the load end of the second resistor 41 is stopped. .
- the driving power for the second relay 44 is supplied via the UP5V terminal 36.
- the third resistor 33 is inserted between the input terminal of the unity gain amplifier 32 and the ground terminal of the second capacitor 42.
- the reason for providing the third resistor 33 in this way is as follows. That is, when there is no third resistor 33, the voltage at the load end of the first resistor 20 (hereinafter referred to as the second voltage) V2 and the constant voltage output (hereinafter referred to as the third voltage) V3 of the unity gain amplifier 32 are Are almost identical to each other.
- the unity gain amplifier 32 is driven at an extremely low impedance, power is supplied to the load from the unity gain amplifier 32 closer to the load than the power source 2, but power is supplied to the unity gain amplifier 32. This is a problem because there is no power to continue to supply.
- the third resistor 33 by providing the third resistor 33, the first voltage V1 input to the unity gain amplifier 32 is slightly lowered by voltage division with the second resistor 41, so that the unity gain amplifier 32 can be set at a lower input voltage. I am going to drive. However, if the third resistance is smaller than necessary, the noise removal performance of the low-pass filter 31 deteriorates, and the first voltage V1 becomes lower in proportion to the third resistance. As a result, the output voltage of the unity gain amplifier 32 is reduced. Since the direct current in a large negative direction (suction direction) flows through the unity gain amplifier 32 as the voltage decreases, it is preferable to use as large a resistor as possible as the third resistor 33.
- the drive power supply 50 is a power supply for driving the unity gain amplifier 32.
- an insulation type DC-DC converter is used, and the DC power converted into a predetermined voltage by the drive power supply 50 is + PW.
- the signal is input from the terminal 39 and the ⁇ PW terminal 40 to the main circuit 30 and supplied to the unity gain amplifier 32 via a line (not shown) inside the main circuit 30.
- the active element of the power supply noise reduction circuit 10 is controlled when the power supply is turned on when the power supply 2 is switched from OFF to ON, and then the final state of the control is changed until the power supply 2 is switched OFF again. maintain. Thereafter, similarly, every time the power supply 2 is switched from OFF to ON, the active element of the power supply noise reduction circuit 10 is controlled.
- This control is programmed in advance as a power supply noise reduction process, and a control unit (not shown) provided in the semiconductor tester executes the program to switch the power supply 2 on and off, and the CHG terminal 37 and OUT. A control signal is output to the terminal 38.
- FIG. 2 is a flowchart of power supply noise reduction processing.
- the step is abbreviated as “S”.
- the control unit controls the first relay 43 to connect the bypass path L7 to place the second resistor 41 in a bypass state, and controls the second relay 44 to disconnect the output path L8.
- SA1 the state (SA1)
- SA2 the power source 2 is switched from OFF to ON (SA2).
- SA2 the state (SA2)
- SA2 the power source 2 is switched from OFF to ON
- a part of the power supply current supplied from the power supply 2 flows into the first capacitor 5 and the second capacitor 42 at the same time, and charges the first capacitor 5 and the second capacitor 42.
- the control unit waits for elapse of the rise time of the power supply 2 (charge completion time of the first capacitor 5).
- the time constant of the low-pass filter 33 can be made substantially zero, so that the first power supply 2 is completely started up (the charging of the first capacitor 5 is completed).
- the charging of the two capacitors 42 is also completed. That is, the startup time of the power supply noise reduction circuit 10 is the same as the rise time of the power supply 2.
- the rise time of the power supply 2 can be determined in advance by a rise characteristic of each power supply or a rise time program. If the rise time of the power supply 2 is not limited, the bypass of the second resistor 41 is unnecessary and can be omitted.
- the control unit controls the first relay 43 to disconnect the bypass path L7 and bring the second resistor 41 into a non-bypass state.
- the output path L8 is connected and the output of the unity gain amplifier 32 is output to the load end of the second resistor 41 (SA4).
- SA4 the control unit controls the first relay 43 to disconnect the bypass path L7 and bring the second resistor 41 into a non-bypass state.
- the unity gain amplifier 32 drives the first voltage V1 input to the input terminal.
- the input terminal of the unity gain amplifier 32 is high impedance, almost no current flows through the unity gain amplifier 32.
- the voltage whose noise is reduced by the low-pass filter 31 is driven by the unity gain amplifier 32 as described above, so that the voltage at the load end of the first resistor 20 and the power line of the AVDD terminal 3 is forcibly unity gain amplifier.
- the noise voltage on the power supply line from the first resistor 20 to the AVDD terminal 3 continuously generated by the noise power output from the power supply 2 becomes a noise current. Is absorbed and consumed by the unity gain amplifier 32.
- the second voltage V2 is lowered to V1, and then fed back to the power source 2 via the monitor line L4. It returns to the originally programmed voltage and converges and stabilizes.
- FIG. 3 is a graph showing the result of analyzing the noise from the output terminal 3 with a spectrum analyzer.
- (c) show analysis results when the power supply noise reduction circuit 10 is turned on in the circuit of FIG. 3A to 3C, the horizontal axis represents frequency (Hz) and the vertical axis represents noise level (dBv).
- the noise reduction effect by the RC series circuit (passive low-pass filter) including the first resistor 20 and the first capacitor 5 is obtained to some extent.
- the noise level is still as high as about -80 dBv.
- the peak of the noise level can be greatly reduced to about ⁇ 100 dBv (10 ⁇ V) by turning on the power supply noise reduction circuit 10. From these, it was confirmed that the noise reduction effect by the power supply noise reduction circuit 10 according to the present embodiment is greater than that of the conventional passive filter.
- the specific circuit configuration can be changed to various configurations by changing the configuration within the scope of the publicly known technology.
- the low-pass filter 31 may be connected to the load end of the first resistor 20 and output a first voltage with reduced noise from a constant voltage output.
- the filter 31 shown in FIG. It is also possible to employ a filter having characteristics. For example, when it is not necessary to consider the regulation when the power supply noise reduction circuit 10 is turned off, the first capacitor 5 may be omitted.
- the first resistor 20 may be integrated into one chip with the main circuit 30.
- the low-pass filter 31 and the unity gain amplifier 32 may be integrated to provide an amplifier having desired filter characteristics.
- the power supply noise reduction circuit 10 has been described as being controlled by the control unit provided in the semiconductor tester. However, this control unit may be incorporated in the power supply circuit.
Abstract
Description
まず、実施の形態の基本的概念について説明する。この実施の形態に係る電源ノイズ低減回路及び電源ノイズ低減方法は、電源から負荷に出力される定電圧出力に含まれるノイズを低減するためのものである。電源ノイズ低減回路は、定電圧電源装置の如き各種の装置や回路から独立して構成されるものの他、これら各種の装置や回路に組み込まれるものを含む。後者の場合としては、例えば、電源ノイズ低減回路を定電圧電源装置の内容に組み込むことで全体として低ノイズ定電圧電源装置を構成した場合が該当する。また、電源ノイズ低減回路は他の装置と協同して動作するように構成してもよく、例えば、電源ノイズ低減回路に含まれる能動素子の制御を、外部の制御装置で制御するようにしてもよい。
次に、実施の形態の具体的内容について説明する。最初に、電源ノイズ低減回路の構成について説明し、その後、この電源ノイズ低減回路を用いて行われる電源ノイズ低減方法について説明する。
図1は本実施の形態に係る電源ノイズ低減回路を含む電源回路のブロック図である。この図1に示す電源回路1は、電源2、出力端子(AVDD端子)3、GND端子4、第1コンデンサ5、及び電源ノイズ低減回路(Active Noise Suppressor)10を備えて構成されている。なお、この図1には、各回路素子の設定値を参考のために記載しているが、この設定値は適宜変更することが可能である。
次に、電源ノイズ低減方法について説明する。ここでは、電源2をオフからオンに切り替えた際の電源立ち上げ時に、電源ノイズ低減回路10の能動素子を制御し、その後は、電源2が再びオフに切り替えられる迄、当該制御の最終状態を維持する。以降同様に、電源2をオフからオンに切り替える毎に、電源ノイズ低減回路10の能動素子を制御する。この制御は電源ノイズ低減処理として予めプログラム化されており、半導体テスタの内部に設けた図示しない制御部が当該プログラムを実行することにより、電源2のオンとオフの切り替えと、CHG端子37及びOUT端子38への制御信号の出力を行う。
最後に、電源ノイズ低減回路10の性能試験の結果について説明する。図3は、出力端子3からのノイズをスペクトラムアナライザにより解析した結果を示すグラフであり、(a)には、図1の回路において電源ノイズ低減回路10をオフ状態とした場合の解析結果(第1抵抗20=1.0Ω、第1コンデンサ5=10μF(15.9kHz))、(b)には、図1の回路において電源ノイズ低減回路10をオフ状態とした場合の解析結果(第1抵抗20=1.0Ω、第1コンデンサ5=100μF(1.6kHz))、(c)には、図1の回路において電源ノイズ低減回路10をオン状態とした場合の解析結果をそれぞれ示す。これら図3(a)~(c)において、横軸は、周波数(Hz)、縦軸は、ノイズレベル(dBv)を示す。
以上、本発明の実施の形態について説明したが、本発明の具体的な構成及び手段は、特許請求の範囲に記載した各発明の技術的思想の範囲内において、任意に改変及び改良することができる。以下、このような変形例について説明する。
また、発明が解決しようとする課題や発明の効果は、前記した内容に限定されるものではなく、本発明によって、前記に記載されていない課題を解決したり、前記に記載されていない効果を奏することもでき、また、記載されている課題の一部のみを解決したり、記載されている効果の一部のみを奏することがある。
具体的な回路構成は、図1に示した構成以外にも、当該構成を公知技術の範囲内で変更することで、様々な構成とすることができる。例えば、ローパスフィルタ31は、第1抵抗20の負荷端に接続され、定電圧出力からノイズを低減した第1電圧を出力するものであればよく、図1に示したフィルタ31以外にも所望の特性を有するフィルタを採用することもできる。また、例えば、電源ノイズ低減回路10の作動オフ時のレギュレーションを考慮する必要がない場合には、第1コンデンサ5を省略してもよい。また、第1抵抗20についても、主回路30と一体に1チップ化してもよい。さらには、ローパスフィルタ31とユニティゲインアンプ32を一体化し、所望のフィルタ特性を有するアンプとしてもよい。
上記実施の形態では、主回路30の内部に、フィルタ31、ユニティゲインアンプ32、及び第3抵抗33をそれぞれ一つのみ設けているが、これらフィルタ31、ユニティゲインアンプ32、及び第3抵抗33(実際には、さらにPF端子34とGF端子35)の組み合わせを複数組設けることで、複数電源用の電源ノイズ低減回路10を構成してもよい。
上記実施の形態では、電源ノイズ低減回路10を、半導体テスタの内部に設けた制御部によって制御するものとして説明したが、この制御部を電源回路の内部に組み込んでもよい。
2 電源
3 出力端子
4 GND端子
5 第1コンデンサ
10 電源ノイズ低減回路
20 第1抵抗
30 主回路
31 ローパスフィルタ
32 ユニティゲインアンプ
33 第3抵抗
34 PF端子
35 GF端子
36 UP5V端子
37 CHG端子
38 OUT端子
39 +PW端子
40 -PW端子
41 第2抵抗
42 第2コンデンサ
43 第1リレー
44 第2リレー
50 駆動電源
L1 電源線
L2 GND線
L3、L4 モニタ線
L5、L6 線路
L7 バイパス路
L8 出力路
V1 第1電圧
V2 第2電圧
V3 第3電圧
Claims (7)
- 電源から負荷に出力される定電圧出力に含まれるノイズを低減するための電源ノイズ低減回路であって、
前記電源から前記負荷に至る電源線に挿入された第1抵抗と、
前記第1抵抗の負荷端に接続され、前記定電圧出力から前記ノイズを低減した第1電圧を出力するローパスフィルタと、
前記ローパスフィルタにて出力された前記第1電圧を駆動して前記第1抵抗の負荷端に出力するユニティゲインアンプと、
を備えた電源ノイズ低減回路。 - 前記ローパスフィルタを、第2抵抗とコンデンサを直列接続して構成した、
請求項1に記載の電源ノイズ低減回路。 - 前記第2抵抗をバイパスするためのバイパス路を切り替えるフィルタ切り替え手段、
を備えた請求項2に記載の電源ノイズ低減回路。 - 前記第2抵抗との分圧により、前記ユニティゲインアンプに対する入力電圧を低下させるための第3抵抗、
を備えた請求項2又は3に記載の電源ノイズ低減回路。 - 前記ユニティゲインアンプから前記第1抵抗の負荷端に至る出力路のオンとオフを切り替えるアンプ切り替え手段、
を備えた請求項1から4のいずれか一項に記載の電源ノイズ低減回路。 - 電源から負荷に出力される定電圧出力に含まれるノイズを低減するための電源ノイズ低減回路を介して、前記ノイズを低減するための電源ノイズ低減方法であって、
前記電源ノイズ低減回路は、
前記電源から前記負荷に至る電源線に挿入された第1抵抗と、
前記第1抵抗の負荷端に接続され、前記定電圧出力から前記ノイズを低減した第1電圧を出力するローパスフィルタであって、第2抵抗とコンデンサを直列接続して構成されたローパスフィルタと、
前記ローパスフィルタにて出力された前記第1電圧を駆動して前記第1抵抗の負荷端に出力するユニティゲインアンプと、
前記第2抵抗をバイパスするためのバイパス路を切り替えるフィルタ切り替え手段と、を備えて構成され、
前記電源をオンにする前に、前記ローパスフィルタ切り替え手段を介して前記第2抵抗をバイパスするように前記バイパス路を切り替えるバイパス工程と、
前記バイパス工程の後に、前記電源をオンにすることにより、前記コンデンサをチャージするチャージ工程と、
前記チャージ工程の後に、前記フィルタ切り替え手段を介して前記第2抵抗を接続するように前記バイパス路を切り替える接続工程と、
を含む電源ノイズ低減方法。 - 前記電源ノイズ低減回路は、前記ユニティゲインアンプから前記第1抵抗の負荷端に至る出力路のオンとオフを切り替えるアンプ切り替え手段とを備えて構成され、
前記バイパス工程において、前記アンプ切り替え手段を介して前記出力路をオフにし、
前記接続工程において、前記アンプ切り替え手段を介して前記出力路をオンにする、
請求項6に記載の電源ノイズ低減方法。
Priority Applications (4)
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JP2012541638A JPWO2012059963A1 (ja) | 2010-11-02 | 2010-11-12 | 電源ノイズ低減回路及び電源ノイズ低減方法 |
CN201080069667.7A CN103168412B (zh) | 2010-11-02 | 2010-11-12 | 电源噪声减小电路和电源噪声减小方法 |
KR1020137012794A KR101727784B1 (ko) | 2010-11-02 | 2010-11-12 | 전원 노이즈 저감 회로 및 전원 노이즈 저감 방법 |
US13/883,278 US9537384B2 (en) | 2010-11-02 | 2010-11-12 | Power supply noise reduction circuit and power supply noise reduction method |
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JP2010246763 | 2010-11-02 | ||
JP2010-246763 | 2010-11-02 |
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KR (1) | KR101727784B1 (ja) |
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CN105048803B (zh) * | 2014-11-04 | 2018-06-26 | 湖南绿智传感技术有限公司 | 一种用于微弱信号检测的直流电源电路 |
FR3034929B1 (fr) * | 2015-04-08 | 2019-03-22 | Schneider Electric Industries Sas | Systeme de filtrage actif |
DE102016103514A1 (de) * | 2016-02-29 | 2017-08-31 | Valeo Schalter Und Sensoren Gmbh | Filtereinrichtung zum Filtern einer Versorgungsspannung eines Ultraschallsensors eines Kraftfahrzeugs, Ultraschallsensorvorrichtung sowie Kraftfahrzeug |
JP7103026B2 (ja) * | 2018-07-30 | 2022-07-20 | 株式会社デンソー | 電池監視装置 |
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JPS61214771A (ja) * | 1985-03-19 | 1986-09-24 | Fujitsu Ltd | ノイズ除去フイルタ回路 |
JPH0477094A (ja) * | 1990-07-16 | 1992-03-11 | Matsushita Electric Ind Co Ltd | 車載用音響再生装置 |
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US3670230A (en) * | 1970-12-21 | 1972-06-13 | Ibm | Active filter capacitor for power supply switching regulators |
US4220926A (en) * | 1977-08-26 | 1980-09-02 | Plessey Handel Und Investments Ag. | Noise detector employing plural delay circuits |
US5408193A (en) * | 1993-09-03 | 1995-04-18 | Trimble Navigation Limited | Active circuit filter for reducing conducted radiation from a load back to its power supply |
US6489755B1 (en) * | 2000-09-18 | 2002-12-03 | Adtran, Inc. | Active ripple and noise filter for telecommunication equipment powering |
US7443229B1 (en) * | 2001-04-24 | 2008-10-28 | Picor Corporation | Active filtering |
US6784728B2 (en) * | 2002-07-31 | 2004-08-31 | Northrop Grumman Corporation | Low noise switched low pass filter with benign transients |
JP4127259B2 (ja) * | 2004-09-30 | 2008-07-30 | 日本電気株式会社 | 電源ノイズ低減回路およびその低減方法 |
US7471016B2 (en) * | 2005-12-19 | 2008-12-30 | O2Micro International Limited | Low pass filter |
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2010
- 2010-11-12 KR KR1020137012794A patent/KR101727784B1/ko active IP Right Grant
- 2010-11-12 JP JP2012541638A patent/JPWO2012059963A1/ja not_active Ceased
- 2010-11-12 WO PCT/JP2010/006657 patent/WO2012059963A1/ja active Application Filing
- 2010-11-12 CN CN201080069667.7A patent/CN103168412B/zh active Active
- 2010-11-12 US US13/883,278 patent/US9537384B2/en active Active
Patent Citations (5)
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JPS60113660A (ja) * | 1983-11-22 | 1985-06-20 | Fuji Electric Co Ltd | スイツチング電源 |
JPS61214771A (ja) * | 1985-03-19 | 1986-09-24 | Fujitsu Ltd | ノイズ除去フイルタ回路 |
JPH0477094A (ja) * | 1990-07-16 | 1992-03-11 | Matsushita Electric Ind Co Ltd | 車載用音響再生装置 |
JPH07303030A (ja) * | 1994-05-02 | 1995-11-14 | Hitachi Ltd | 半導体集積回路 |
JP2001085996A (ja) * | 1999-09-09 | 2001-03-30 | Mitsubishi Electric Corp | 高速ロックアップ回路 |
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US9537384B2 (en) | 2017-01-03 |
KR20140001903A (ko) | 2014-01-07 |
JPWO2012059963A1 (ja) | 2014-05-12 |
CN103168412B (zh) | 2017-04-05 |
KR101727784B1 (ko) | 2017-04-17 |
US20130308354A1 (en) | 2013-11-21 |
CN103168412A (zh) | 2013-06-19 |
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