CN106357103B - 在后级具备dc-dc变换器的数字控制电源 - Google Patents

在后级具备dc-dc变换器的数字控制电源 Download PDF

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CN106357103B
CN106357103B CN201610555156.5A CN201610555156A CN106357103B CN 106357103 B CN106357103 B CN 106357103B CN 201610555156 A CN201610555156 A CN 201610555156A CN 106357103 B CN106357103 B CN 106357103B
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converter
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control power
value
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土本将孝
小林尚平
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Fanuc Corp
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B15/00—Systems controlled by a computer
    • G05B15/02—Systems controlled by a computer electric
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/34—Snubber circuits
    • 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
    • H02M1/36—Means for starting or stopping converters
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/34—Snubber circuits
    • H02M1/346—Passive non-dissipative snubbers
    • 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
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Dc-Dc Converters (AREA)

Abstract

本发明涉及一种在后级具备DC‑DC变换器的数字控制电源。在该数字控制电源中，将该输出电压设定值预先设定为在变动容许范围内的上限值附近。通过这样，即使由于后级的DC‑DC变换器在上升时流过的启动电流导致发生电压下降，也预先较高地设定输出电压设定值，因此能够将输出电压值收敛在变动容许范围内。因此能够不限制DC‑DC变换器的启动电流而使其变大，并能够缩短电源的上升时间。

Description

在后级具备DC-DC变换器的数字控制电源
技术领域
本发明涉及一种在输出端子的前端连接有DC-DC变换器的数字控制电源。
背景技术
在后级具备1个或一个以上通道的DC-DC变换器的电源电路中，有时会由于后级的DC-DC变换器的启动电流而导致产生瞬间的电压下降。作为抑制这种瞬间的电压下降的技术，在例如日本特开2002-049430号公报以及日本特开2005-198454号公报中公开以下电源电路，即，使用电容器、齐纳二极管来抑制DC-DC电路的启动直到输入成为固定电压为止，由此，将输出电压值抑制在规定范围内。另外，日本特开平10-290524号公报中公开以下电源电路，即，通过在控制电源和DC-DC变换器之间插入热敏电阻等启动电流抑制电路，来抑制启动电流的影响，并抑制瞬间的电压下降。
图3是现有技术的数字控制电源的电源电路的概略结构图。
在该电源电路中，运算处理装置4根据经由A/D变换器5而被反馈来的输出电压Vout1的值进行数字运算，并将基于该运算的结果的指令值输出给PWM生成部3。PWM生成部3根据来自运算处理装置4的指令值而生成PWM信号并输出，开关电源电路2根据该输出的PWM信号而输出电压Vout1。然后，通过从开关电源电路2输出的电压Vout1，在DC-DC变换器12a中流过启动电流Iout1，输出电压Vout2。为了对瞬间流过的电流量施加限制，设置了启动电流抑制电路11。
在图4A的图表中表示，没有在图3所示的电源电路中组入热敏电阻器等启动电流抑制电路11的情况下的启动时的电流/电压的变化；在图4B的图表中表示组入了启动电流抑制电路11的情况下的启动时的电流/电压的变化。
在未将启动电流抑制电路11组入到电源电路中的情况下，如图4A所示，有时会由于后级的DC-DC变换器12a的启动电流Iout1的冲击电流，导致数字控制电源1的输出电压Vout1发生瞬间的电压下降。
与此相对地，在将启动电流抑制电路11组入到电源电路中的情况下，如图4B所示，通过对启动电流Iout1设置限制，能够抑制数字控制电源1的输出电压Vout1的电压下降。
但是，在通过设置启动电流抑制电路而对启动电流设置限制的情况下，电源的上升时间变长，因此存在有时不能够满足启动时的请求顺序的问题。另外，在通过电容器抑制启动时的电压变动的方法中需要大容量的电容器，存在妨碍电源小型化的问题。
发明内容
因此，本发明的目的在于，提供一种能够不增加电源电路的输出电容器的容量地缩短上升时间的数字控制电源。
本发明的数字控制电源具备：将电压变换为数值的A/D变换器、对由该A/D变换器变换后的数值进行数字运算的运算处理装置、生成基于来自该运算处理装置的指令值的PWM信号的PWM生成部、输出基于从该PWM生成部输出的PWM信号的电压值的开关电源电路，在输出端子的前端连接有DC-DC变换器。并且，该数字控制电源还具备：电压监视部，其通过上述运算处理装置监视上述DC-DC变换器的输出电压；变更部，其将上述数字控制电源的输出电压设定值预先设定为输出电压的容许范围的大概上限值，当通过上述电压监视部检测出上述DC-DC变换器的输出电压值超过了预先设定的阈值时，变更来自上述运算处理装置的指令值，并将输出电压设定值变更为输出电压的规定值。
通过本发明，即使是在由于后级的DC-DC变换器的启动电流导致大幅的电压下降的情况下，也能够在变动容许范围内将输出电压设定值设定为上限值附近，因此能够将数字控制电源的输出电压值收敛在变动容许范围内。因此，不需要大容量的输出电容器，能够降低电源电路的输出电容器的容量。另外，不需要抑制后级的DC-DC变换器的启动电流而能够使其变大，因此能够缩短上升时间。
附图说明
通过参照附图说明以下的实施例，能够更加明确本发明的上述以及其他目的、特征。在这些附图中：
图1是表示了包含本发明一个实施方式的数字控制电源的电源电路的概略结构的图。
图2是通过图表表示了图1的电源电路的输出电压、DC-DC变换器的输出电压、以及启动电流的图。
图3是现有技术的电源电路的概略结构图。
图4A是表示未将启动电流抑制电路组入到图3所示的电源电路中的情况下的启动时的电流/电压的变化的图。
图4B是表示图3所示的电源电路(组入了启动电流抑制电路)的启动时的电流/电压的变化的图。
具体实施方式
以下，参照附图1以及图2说明本发明的实施方式。另外，对参照图3～图4B而说明的与现有技术相同或类似的结构，使用相同的标记进行说明。
在本发明的数字控制电源中，将数字控制电源的输出电压设定值预先设定为在变动容许范围内的上限值附近。通过这样进行设定，即使由后级的DC-DC变换器在上升时流过的启动电流导致发生了电压下降，由于将输出电压设定值预先设定得较高，因此能够将输出电压值收敛在变动容许范围内。因此，能够不限制DC-DC变换器的启动电流而使其变大，能够缩短电源的上升时间。
图1是表示了包含本发明一个实施方式的数字控制电源的电源电路的概略结构的图。
在该电源电路中，当将输入电压Vin经由电容器8而输入到数字控制电源1时，通过开关电源电路2进行变换，而将输出电压Vout1输出给输出端子13。在数字控制电源1的后级连接有与通道数量相同数量的DC-DC变换器12a、12b、12c、……。经由电容器9而输入的数字控制电源1的电压Vout1通过DC-DC变换器12a、12b、12c、……被分别变换为电压Vout2、Vout3、Vout4、……，并分别经由电容器10a、10b、10c、……而输出。
将输出电压设定值设定给数字控制电源1，运算处理装置4根据经由A/D变换器5a而被反馈来的输出电压Vout1的值，运算指令值而输出给PWM生成部3，以使输出电压Vout1成为输出电压设定值。然后，PWM生成部3根据从运算处理装置4接收到的指令值来生成PWM信号而输出，并根据该输出的PWM信号从开关电源电路2输出电压Vout1。
另外，运算处理装置4具备输出电压监视部6以及输出电压设定值变更部7。输出电压监视部6监视经由A/D变换器5b、5c、5d、……而反馈来的来自DC-DC变换器12a、12b、12c、……的输出电压Vout2、Vout3、Vout4、……的值，输出电压设定值变更部7根据该监视到的来自各DC-DC变换器12a、12b、12c、……的输出电压值，变更数字控制电源1的输出电压设定值。该输出电压设定值变更部7在电源电路的启动时，将输出电压设定值变更为预先设定给数字控制电源1的输出电压Vout1的变动容许范围内的大概上限值，并在从DC-DC变换器12a、12b、12c、……反馈来的输出电压Vout2、Vout3、Vout4、……超过了各自的输出电压的预先设定的阈值的时刻，将输出电压设定值变更为通常的输出电压值的规定值。
图2是通过图表表示了图1的电源电路的输出电压Vout1、DC-DC变换器12a的输出电压Vout2以及启动电流Iout1的图。
如图2所示，在本发明的电源电路中，在电源启动时数字控制电源1的输出电压设定值被设定为输出电压Vout1的变动容许范围内的大概上限值。因此，在DC-DC变换器12a中流过的启动电流Iout1中产生冲击电流，即使在输出电压Vout1发生电压下降的情况下也能够将该输出电压Vout1的值收敛在变动容许范围内(参照图2的箭头A)。
之后，当DC-DC变换器12a的输出电压Vout2的值超过预先设定的阈值(参照图2的箭头B)时，则判定为电源电路的启动已结束，并将数字控制电源1的输出电压设定值变更为通常的输出电压值的规定值(参照图2的箭头C)。另外，在设置多个DC-DC变换器的情况下，当所有的DC-DC变换器的输出电压值超过了各自的阈值时，判定为电源电路的启动已结束即可。
通过本实施方式的数字控制电源的结构，即使在由于后级的DC-DC变换器的启动电流造成大幅的电压下降的情况下，也将电压设定值设定为在变动容许范围内的上限值附近，因此能够降低电源电路的输出电容器的容量。另外，由于能够使后级的DC-DC变换器的启动电流变大，因此能够缩短上升时间。
以上说明了本发明的实施方式，但是本发明不只限定于上述实施方式的例子，也能够通过增加适当的变更而通过各种方式来实施。

Claims (1)

1.一种数字控制电源，具备：A/D变换器，其将电压变换为数值；运算处理装置，其对通过该A/D变换器变换而得的数值进行数字运算；PWM生成部，其生成基于来自该运算处理装置的指令值的PWM信号；以及开关电源电路，其输出基于从该PWM生成部输出的PWM信号的电压值，该数字控制电源在输出端子的前端连接有DC-DC变换器，其特征在于，
该数字控制电源还具备：
电压监视部，其通过上述运算处理装置监视上述DC-DC变换器的输出电压；以及
变更部，其将上述数字控制电源的输出电压设定值预先设定为数字控制电源的输出电压的容许范围内的大概上限值，当通过上述电压监视部检测出上述DC-DC变换器的输出电压值超过了预先设定的阈值时，变更来自上述运算处理装置的指令值，并将输出电压设定值变更为数字控制电源的输出电压的规定值。
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