WO2016132930A1 - 電源制御用半導体装置 - Google Patents
電源制御用半導体装置 Download PDFInfo
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- WO2016132930A1 WO2016132930A1 PCT/JP2016/053445 JP2016053445W WO2016132930A1 WO 2016132930 A1 WO2016132930 A1 WO 2016132930A1 JP 2016053445 W JP2016053445 W JP 2016053445W WO 2016132930 A1 WO2016132930 A1 WO 2016132930A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1257—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to short circuit or wrong polarity in output circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- 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
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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
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
Definitions
- the present invention relates to a power supply control semiconductor device, and more particularly to a technique that is effective when used in a control semiconductor device that constitutes an insulated DC power supply device including a voltage conversion transformer.
- the DC power supply device includes an AC / DC converter composed of a diode bridge circuit that rectifies an AC power supply, and an isolated DC-DC converter that steps down the DC voltage rectified by the circuit and converts it into a DC voltage having a desired potential.
- a DC converter for example, a switching element connected in series with a primary winding of a voltage conversion transformer is turned on / off by a PWM (pulse width modulation) control method, a PFM (pulse frequency modulation) control method, or the like.
- a switching power supply device is known in which the current induced in the secondary winding is controlled indirectly by controlling the current flowing in the primary winding.
- a resistor for current detection is provided in series with the switching element on the primary side, and the power control circuit (IC) is provided with the resistor.
- IC power control circuit
- JP 2001-157446 A Japanese Patent Laid-Open No. 06-62564
- Patent Document 2 is an invention of a switching regulator (DC-DC converter), not an AC-DC converter, and is different from the present invention, and the terminals of the current detection resistors are short-circuited.
- power supply control is promptly performed because the stop operation when the current detection terminal is open or when the transformer is short-circuited is not disclosed.
- the present invention has been made under the background as described above, and the object of the present invention is to control the power supply that can safely stop the power supply device when the current detection terminal is opened or the transformer is short-circuited.
- a semiconductor device is provided.
- a switching element for passing a current intermittently through the primary winding of the transformer for voltage conversion, a voltage proportional to the current flowing through the primary winding of the transformer, and an output voltage detection signal from the secondary side of the transformer Is a power supply control semiconductor device that generates and outputs a drive pulse for on / off control, An on / off control signal generating circuit for generating a control signal for controlling on / off of the switching element;
- a current detection terminal to which a voltage proportional to the current flowing through the primary winding of the transformer is input;
- a high-impedance pull-up means provided between the current detection terminal and a terminal to which an internal power supply voltage or a voltage corresponding thereto is applied;
- a terminal monitoring circuit that compares the voltage of the current detection terminal with a predetermined voltage and determines that the current detection terminal is abnormal when it is detected that the voltage of the current detection terminal is higher than the predetermined voltage; When the terminal monitoring circuit detects an abnormality of the current detection terminal, the signal generation operation of the on
- a first power supply terminal to which an AC input voltage is input;
- a second power supply terminal to which a voltage obtained by rectifying and smoothing a voltage induced in the auxiliary winding of the transformer is input;
- Switch means provided between the first power supply terminal and the second power supply terminal;
- An activation circuit for controlling the voltage of the second power supply terminal to fall within a predetermined first voltage range by controlling the switch means on and off based on the voltage of the second power supply terminal;
- a state control circuit for controlling the switching means to be turned on and off based on the voltage of the second power supply terminal so that the voltage of the second power supply terminal falls within a second voltage range narrower than the first voltage range.
- an abnormality detection circuit for detecting an abnormal state by monitoring states of the current detection terminal and the external input terminal;
- the signal generation operation of the on / off control signal generation circuit is stopped by the signal output from the abnormality detection circuit and the state control circuit Is configured to be in an operating state.
- the operation of the signal generation circuit that generates a signal for turning on and off the switching element is stopped.
- the power supply device can be safely stopped and the start-up circuit (start-up circuit) can be prevented from falling into an unreasonable operating state.
- the current detection terminal in a control semiconductor device of an insulated DC power supply device that includes a voltage conversion transformer and controls the output by turning on and off the current flowing through the primary winding, the current detection terminal is in an open state. When the transformer is short-circuited, the power supply apparatus can be safely stopped.
- FIG. 1 is a circuit configuration diagram showing an embodiment of an AC-DC converter as an insulated DC power supply device according to the present invention.
- FIG. FIG. 2 is a block diagram illustrating a configuration example of a primary switching power supply control circuit (power supply control IC) of a transformer in the AC-DC converter of FIG. 1. It is a wave form diagram which shows the mode of the change of the voltage of each part in IC for power supply control of an Example. It is a characteristic view which shows the relationship between the switching frequency and feedback voltage VFB in IC for power supply control of an Example. It is a circuit block diagram which shows the structural example of CS terminal monitoring circuit in IC for power supply control of an Example. It is a circuit block diagram which shows the other Example of power supply control IC which has CS terminal monitoring circuit.
- power supply control IC power supply control circuit
- 6 is a timing chart showing a change in voltage of each part of an IC when a current detection terminal CS is in an open state in a conventional power supply control IC not having a CS terminal monitoring circuit. 6 is a timing chart showing a change in voltage of each part of the IC when the current detection terminal CS is in an open state in the power supply control IC of the embodiment including the CS terminal monitoring circuit.
- FIG. 1 is a circuit configuration diagram showing an embodiment of an AC-DC converter as an insulated DC power supply device to which the present invention is applied.
- the AC-DC converter includes an X capacitor Cx connected between AC input terminals to attenuate normal mode noise, a noise blocking filter 11 including a common mode coil, and an alternating voltage (AC).
- a diode bridge circuit 12 that rectifies the voltage, a smoothing capacitor C1 that smoothes the voltage after rectification, a voltage conversion transformer T1 that includes a primary winding Np, a secondary winding Ns, and an auxiliary winding Nb; And a switching transistor SW composed of an N-channel MOSFET connected in series with the primary winding Np of the transformer T1, and a power supply control circuit 13 for driving the switching transistor SW.
- the power supply control circuit 13 is formed as a semiconductor integrated circuit (hereinafter referred to as a power supply control IC) on a single semiconductor chip such as single crystal silicon.
- the secondary side of the transformer T1 is connected between the rectifying diode D2 connected in series with the secondary side winding Ns and between the cathode terminal of the diode D2 and the other terminal of the secondary side winding Ns.
- Smoothing capacitor C2 is provided, and the primary side winding Np is rectified and smoothed by rectifying and smoothing the AC voltage induced in the secondary side winding Ns by passing a current intermittently through the primary side winding Np.
- DC voltage Vout corresponding to the winding ratio of the secondary winding Ns.
- the secondary side of the transformer T1 is provided with a coil L3 and a capacitor C3 which constitute a filter for cutting off switching ripple, noise, etc. generated by the switching operation on the primary side, and detects the output voltage Vout.
- a photodiode 15a as a light emitting side element of a photocoupler connected to the detection circuit 14 and transmitting a signal corresponding to the detection voltage to the power supply control IC 13 is provided.
- a phototransistor 15b is provided as a light receiving side element that is connected between the feedback terminal FB of the power supply control IC 13 and a ground point and receives a signal from the detection circuit 14.
- the primary side of the AC-DC converter of this embodiment is connected between the rectifying diode D0 connected in series with the auxiliary winding Nb, and between the cathode terminal of the diode D0 and the ground point GND.
- a rectifying / smoothing circuit including a smoothing capacitor C0 is provided, and a voltage rectified and smoothed by the rectifying / smoothing circuit is applied to the power supply voltage terminal VDD of the power supply control IC 13.
- the power supply control IC 13 is provided with a high voltage input starting terminal HV to which a voltage before being rectified by the diode bridge circuit 12 is applied via the diodes D11 and D12 and the resistor R1. Immediately after the plug is inserted, it is configured to be able to operate with the voltage from the high voltage input starting terminal HV.
- a current detection resistor Rs is connected between the source terminal of the switching transistor SW and the ground point GND, and the node N1 between the switching transistor SW and the current detection resistor Rs and the power supply control are connected.
- a resistor R2 is connected between the current detection terminal CS of the IC 13 for use.
- a capacitor C4 is connected between the current detection terminal CS of the power supply control IC 13 and the ground point, and a low-pass filter is configured by the resistor R2 and the capacitor C4.
- the power supply control IC 13 of this embodiment includes an oscillation circuit 31 that oscillates at a frequency corresponding to the voltage VFB of the feedback terminal FB, and a primary signal based on the oscillation signal ⁇ c generated by the oscillation circuit 31.
- Clock generating circuit 32 comprising a circuit such as a one-shot pulse generating circuit for generating a clock signal CK that gives the timing for turning on the side switching transistor SW, an RS flip-flop 33 set by the clock signal CK, and the flip-flop A driver (drive circuit) 34 that generates a drive pulse GATE of the switching transistor SW according to the output of 33 is provided.
- the power supply control IC 13 also amplifies the voltage Vcs input to the current detection terminal CS, and the potential Vcs ′ amplified by the amplifier 35 and a comparison voltage (threshold for monitoring an overcurrent state).
- a comparator 36a as a voltage comparison circuit for comparing the hold voltage (Vocp), a waveform generation circuit 37 for generating a voltage RAMP having a predetermined waveform as shown in FIG. 3 (A) based on the voltage VFB of the feedback terminal FB,
- a comparator 36b for comparing the waveform potential Vcs ′ amplified by the amplifier 35 and the waveform RAMP generated by the waveform generation circuit 37 as shown in FIG. 3B, and the logical sum of the outputs of the comparators 36a and 36b.
- OR gate G1 is provided.
- the voltage RAMP in FIG. 3A is generated so as to decrease with a certain slope from the feedback voltage VFB.
- the power supply control IC 13 of this embodiment monitors the output of the amplifier 35 that amplifies the voltage of the current detection terminal CS, and no significant voltages VFB and Vcs are generated at the feedback terminal FB and the current detection terminal CS.
- a comparator 36c as a soft start circuit for generating a signal Rss for resetting the flip-flop 33 so as to gradually increase the primary current so that an excessive current does not flow through the primary winding when the power is turned on; and the comparator 36c And an OR gate G2 for taking a logical sum of the output of the above and the OR gate G1.
- the output RS of the OR gate G2 (see FIG. 3C) is input to the reset terminal of the flip-flop 33 via the OR gate G3, thereby giving a timing for turning off the switching transistor SW. Yes.
- a pull-up resistor or a constant current source is provided between the feedback terminal FB and the internal power supply voltage terminal, and a current flowing through the phototransistor 15b is converted into a voltage by the resistor.
- the waveform generation circuit 37 is provided to prevent subharmonic oscillation, and the voltage VFB may be directly or level-shifted and input to the comparator 36b.
- the power supply control IC 13 of this embodiment includes a frequency control circuit 38 that changes the oscillation frequency of the oscillation circuit 31, that is, the switching frequency in accordance with the voltage VFB of the feedback terminal FB according to the characteristics shown in FIG.
- the frequency f1 in FIG. 4 is set to a value such as 22 kHz
- f2 is set to an arbitrary value in a range such as 66 kHz to 100 kHz.
- the frequency control circuit 38 includes a buffer such as a voltage follower and a clamp circuit that clamps to 1.8 V when the voltage of the feedback terminal FB is, for example, 1.8 V or less, and to 2.2 V when the voltage is 2.2 V or more. And can be configured.
- the oscillation circuit 31 includes a current source that supplies a current according to the voltage from the frequency control circuit 38, and can be configured by an oscillator whose oscillation frequency changes depending on the magnitude of the current that the current source flows.
- the duty (Ton / Tcycle) of the drive pulse GATE is a predetermined maximum value (for example, 85%).
- a duty limit circuit 39 for generating a maximum duty reset signal for limiting so as not to exceed (90%) is passed through the OR gate G3.
- the power supply control IC 13 of the present embodiment is provided with a CS terminal monitoring circuit 40 for monitoring the voltage Vcs of the current detection terminal CS and detecting an abnormality (open) of the CS terminal.
- a CS terminal monitoring circuit 40 for monitoring the voltage Vcs of the current detection terminal CS and detecting an abnormality (open) of the CS terminal.
- the CS terminal monitoring circuit 40 detects an abnormality (open) of the current detection terminal CS, its output changes to a high level and stops the operation of the driver (drive circuit) 34.
- the drive pulse GATE output from the driver 34 is fixed at a low level (SW is turned off).
- the flip-flop 33 in the previous stage is reset and the output Q is fixed at a low level so that the drive pulse GATE is fixed at a low level. You may comprise.
- FIG. 5 shows a configuration example of the CS terminal monitoring circuit 40 constituting the power supply control IC 13 of the present embodiment.
- the CS terminal monitoring circuit 40 includes a constant current source 41 connected between a power supply line for supplying an internal power supply voltage Vreg and a current detection terminal CS, and a non-inverting input terminal for the current detection terminal CS. And a comparator 42 to which a detection voltage Vref0 (for example, 2.5 V) is applied to the inverting input terminal.
- FIG. 5 includes an amplifier AMP and resistors R21 and R22, and amplifies the voltage Vcs of the current detection terminal CS with an amplification factor of, for example, 4.8 times to the overcurrent detection comparator 36a.
- An amplifier (amplifying circuit) 35 to be supplied is also shown.
- the power supply control IC of this embodiment provided with the CS terminal monitoring circuit 40 as shown in FIG. 5, when the current detection terminal CS is in the open state, as shown by the arrow in FIG. 5, when the current detection terminal CS is in the open state, as shown by the arrow in FIG. At the timing t1 when the open occurs, the voltage of the current detection terminal CS is raised to the internal power supply voltage Vreg (for example, 5 V) by the constant current source 41. Therefore, the output of the comparator 42 changes to a high level, the operation of the driver 34 is stopped, and the drive pulse GATE that is the output is fixed at a low level (SW is turned off). As a result, no current flows through the primary winding of the transformer, and the operation of the power supply device is safely stopped.
- Vreg for example, 5 V
- the constant current source 41 can be replaced with a resistance element Rp (see FIG. 6).
- the constant current source 41 and the resistance element Rp function as high impedance pull-up means provided between the current detection terminal CS and the internal power supply voltage.
- FIG. 6 shows another embodiment of the power supply control IC having the CS terminal monitoring circuit 40.
- the CS terminal monitoring circuit 40 detects an abnormality of the current detection terminal CS (CS terminal open)
- the operation is stopped while the output GATE of the driver 34 is at a low level, and the latch stop control circuit 51 is operated to shift the power supply control IC 13 to the latch stop mode.
- the latch stop is performed by turning on and off the switch S0 provided between the high voltage input start terminal HV and the power supply voltage terminal VDD of the IC in a relatively short period.
- This is a function for preventing the power supply control IC 13 from restarting by suppressing the voltage of VDD to a voltage range of, for example, 12V to 13V, and the latch stop control circuit 51 has a predetermined voltage with respect to the voltage of the power supply voltage terminal VDD.
- the switch S0 is turned on when the voltage of the power supply voltage terminal VDD is lowered to 12V, and the switch S0 is turned off when the voltage of VDD rises to 13V.
- the startup circuit (startup circuit) 52 operates to turn on the switch S0 and restart the IC. Switching control is started.
- the start-up circuit (start-up circuit) 52 turns off the switch S0. The above operation of being stopped is repeated.
- the CS terminal monitoring circuit 40 detects the CS terminal open, the operation of the driver 34 is stopped, the latch stop control circuit 51 is operated, and the power supply control IC 13 is shifted to the latch stop mode.
- the above-mentioned unreasonable operation is avoided.
- the latch stop mode is canceled by pulling out the plug on the AC power supply side from the outlet.
- a CS terminal short-circuit detection circuit 54 is provided for monitoring and stopping the operation of the driver 34 when none of the outputs of the comparators 36a to 36c is input and the voltage of the FB terminal becomes a predetermined voltage value or less. It has been.
- the maximum duty reset signal output from the duty limiter circuit 39 is output every cycle of the drive pulse, and continues to be generated even if both terminals of the current detection resistor Rs or the current detection terminal and the ground are short-circuited. .
- one of the reset signals of the output Rocp of the overcurrent protection comparator 36a, the output Rfb of the feedback control comparator 36b, and the output Rss of the CS terminal open detection comparator 36c is normal. Although it is always generated within one cycle, none of these signals are generated when a short circuit occurs between the current detection terminal CS and the ground point or a short circuit (short circuit) of the sense resistor Rs occurs.
- the switching transistor SW that allows current to flow intermittently through the primary winding of the transformer is a separate element from the power supply control IC 13.
- the switching transistor SW is incorporated into the power supply control IC 13. You may comprise as one semiconductor integrated circuit.
- PSR Primary Side Side Regulation
- Line filter 11 Line filter 12 Diode bridge circuit (rectifier circuit) 13 Power control circuit (Power control IC) 14 Secondary side detection circuit (IC for detection) 15a Light-emitting diode of photocoupler 15b Light-receiving transistor of photocoupler 31 Oscillation circuit 32 Clock generation circuit 34 Driver (drive circuit) 35 Amplifier (Non-inverting amplifier circuit) 36a Overcurrent detection comparator (overcurrent detection circuit) 36b Voltage / current control comparator (voltage / current control circuit) 36c CS terminal open detection comparator (terminal voltage monitoring circuit) 37 Waveform generation circuit 38 Frequency control circuit 39 Duty limit circuit 40 CS terminal monitoring circuit 51 Latch stop control circuit (state control circuit)
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Abstract
Description
なお、チョッパ方式のスイッチングレギュレータにおいて、電流検出用抵抗の端子間電圧を検出する回路を設け、両端間電圧が0Vになったことを検出した場合に基準電圧発生回路の出力を低下させることで、スイッチング制御回路の動作を停止させるようにした発明が提案されている(特許文献2参照)。
電圧変換用のトランスの一次側巻線に間欠的に電流を流すためのスイッチング素子を、前記トランスの一次側巻線に流れる電流に比例した電圧と前記トランスの二次側からの出力電圧検出信号が入力されることで、オン、オフ制御する駆動パルスを生成し出力する電源制御用半導体装置であって、
前記スイッチング素子をオン、オフ制御する制御信号を生成するオン、オフ制御信号生成回路と、
前記トランスの一次側巻線に流れる電流に比例した電圧が入力される電流検出端子と、
前記電流検出端子と内部電源電圧もしくはそれに応じた電圧が印加される端子との間に設けられた高インピーダンスのプルアップ手段と、
前記電流検出端子の電圧と所定の電圧とを比較して前記電流検出端子の電圧が前記所定の電圧よりも高いことを検出した場合に前記電流検出端子の異常と判定する端子監視回路と、
を備え、前記端子監視回路が前記電流検出端子の異常を検出すると、前記端子監視回路から出力される信号によって前記オン、オフ制御信号生成回路の信号生成動作が停止されるように構成した。
前記トランスの補助巻線に誘起された電圧を整流、平滑した電圧が入力される第2電源端子と、
前記第1電源端子と前記第2電源端子との間に設けられたスイッチ手段と、
前記第2電源端子の電圧に基づいて前記スイッチ手段をオン、オフ制御して前記第2電源端子の電圧が、所定の第1電圧範囲に入るように制御する起動回路と、
前記第2電源端子の電圧に基づいて前記スイッチ手段をオン、オフ制御して前記第2電源端子の電圧が、前記第1電圧範囲よりも狭い第2電圧範囲に入るように制御する状態制御回路と、
を備え、前記端子監視回路が前記電流検出端子の異常を検出すると、前記端子監視回路から出力される信号によって前記状態制御回路が動作状態になるように構成する。
前記電流検出端子および前記外部入力端子の状態を監視して異常状態を検出する異常検出回路と、
を備え、前記異常検出回路が前記電流検出端子の異常を検出すると、前記異常検出回路から出力される信号によって、前記オン、オフ制御信号生成回路の信号生成動作が停止されるとともに前記状態制御回路が動作状態になるように構成する。
これにより、電流検出端子と接地点との間が短絡したり電流検出用の抵抗がショートした場合にも、スイッチング素子をオン、オフさせる信号を生成する信号生成回路の動作が停止されるため、電源装置を安全に停止させることができるとともに、起動回路(スタートアップ回路)により不合理な動作状態に陥るのを防止することができる。
図1は、本発明を適用した絶縁型直流電源装置としてのAC-DCコンバータの一実施形態を示す回路構成図である。
一方、電源制御用IC13には、ダイオード・ブリッジ回路12で整流される前の電圧がダイオードD11,D12および抵抗R1を介して印加される高圧入力起動端子HVが設けられており、電源投入時(プラグが差し込まれた直後)は、この高圧入力起動端子HVからの電圧で動作することができるように構成されている。
図2に示すように、本実施例の電源制御用IC13は、フィードバック端子FBの電圧VFBに応じた周波数で発振する発振回路31と、該発振回路31で生成された発振信号φcに基づいて一次側スイッチングトランジスタSWをオンさせるタイミングを与えるクロック信号CKを生成するワンショットパルス生成回路のような回路からなるクロック生成回路32と、クロック信号CKによってセットされるRS・フリップフロップ33と、該フリップフロップ33の出力に応じてスイッチングトランジスタSWの駆動パルスGATEを生成するドライバ(駆動回路)34を備える。
図5に示すように、CS端子監視回路40は、内部電源電圧Vregを供給する電源ラインと電流検出端子CSとの間に接続された定電流源41と、電流検出端子CSに非反転入力端子が接続され反転入力端子に検出電圧Vref0(例えば2.5V)が印加されたコンパレータ42とから構成されている。また、図5には、アンプAMPと抵抗R21,R22とからなり、電流検出端子CSの電圧Vcsを例えば4.8倍のような増幅率で増幅して、過電流検出用の前記コンパレータ36aへ供給するアンプ(増幅回路)35が併せて示されている。
なお、上記定電流源41は、抵抗素子Rpに置き換えることが可能である(図6参照)。定電流源41および抵抗素子Rpは、電流検出端子CSと内部電源電圧との間に設けられた高インピーダンスのプルアップ手段として機能する。
図6の実施例は、CS端子監視回路40が電流検出端子CSの異常(CS端子オープン)を検出すると、ドライバ34の出力GATEをローレベルにした状態で動作を停止させるとともに、ラッチ停止制御回路51を動作させて、電源制御用IC13をラッチ停止モードに移行させるように構成したものである。
してドライバ34の動作を停止させた場合、補助巻線に電流が流れなくなって電源電圧端子VDDの電圧が下がることとなるが、電源電圧端子VDDの電圧がICの動作停止電圧値(例えば6.5V)以下になると起動回路(スタートアップ回路)52が動作してスイッチS0をオンさせ、ICが再起動することでスイッチング制御が開始される。そして、電源電圧端子VDDの電圧が上限電圧値(例えば21V)に達すると起動回路(スタートアップ回路)52はスイッチS0をオフさせるが、再起動によりCS端子オープン検出前の状態に戻ってドライバ34が停止されるという上記動作を繰り返してしまう。
なお、上記ラッチ停止モードは、AC電源側のプラグをコンセントから引き抜くことで解除される。
これにより、CS端子もしくはセンス抵抗Rsの短絡により、一次巻線に電流が流れ続けるのを防止することができるとともに、ラッチ停止モードに移行することで起動回路(スタートアップ回路)52による電源制御用ICの再起動により電源装置が再起動されるのを回避し、電源装置を停止し続けることが可能である。
12 ダイオード・ブリッジ回路(整流回路)
13 電源制御回路(電源制御用IC)
14 二次側検出回路(検出用IC)
15a フォトカプラの発光側ダイオード
15b フォトカプラの受光側トランジスタ
31 発振回路
32 クロック生成回路
34 ドライバ(駆動回路)
35 アンプ(非反転増幅回路)
36a 過電流検出用コンパレータ(過電流検出回路)
36b 電圧/電流制御用コンパレータ(電圧/電流制御回路)
36c CS端子オープン検出用コンパレータ(端子電圧監視回路)
37 波形生成回路
38 周波数制御回路
39 デューティ制限回路
40 CS端子監視回路
51 ラッチ停止制御回路(状態制御回路)
Claims (3)
- 電圧変換用のトランスの一次側巻線に間欠的に電流を流すためのスイッチング素子を、前記トランスの一次側巻線に流れる電流に比例した電圧と前記トランスの二次側からの出力電圧検出信号が入力されることで、オン、オフ制御する駆動パルスを生成し出力する電源制御用半導体装置であって、
前記スイッチング素子をオン、オフ制御する制御信号を生成するオン、オフ制御信号生成回路と、
前記トランスの一次側巻線に流れる電流に比例した電圧が入力される電流検出端子と、
前記電流検出端子と内部電源電圧もしくはそれに応じた電圧が印加される端子との間に設けられた高インピーダンスのプルアップ手段と、
前記電流検出端子の電圧と所定の電圧とを比較して前記電流検出端子の電圧が前記所定の電圧よりも高いことを検出した場合に前記電流検出端子の異常と判定する端子監視回路と、
を備え、前記端子監視回路が前記電流検出端子の異常を検出すると、前記端子監視回路から出力される信号によって前記オン、オフ制御信号生成回路の信号生成動作が停止されるように構成されていることを特徴とする電源制御用半導体装置。 - AC入力の電圧が入力される第1電源端子と、
前記トランスの補助巻線に誘起された電圧を整流、平滑した電圧が入力される第2電源端子と、
前記第1電源端子と前記第2電源端子との間に設けられたスイッチ手段と、
前記第2電源端子の電圧に基づいて前記スイッチ手段をオン、オフ制御して前記第2電源端子の電圧が、所定の第1電圧範囲に入るように制御する起動回路と、
前記第2電源端子の電圧に基づいて前記スイッチ手段をオン、オフ制御して前記第2電源端子の電圧が、前記第1電圧範囲よりも狭い第2電圧範囲に入るように制御する状態制御回路と、
を備え、前記端子監視回路が前記電流検出端子の異常を検出すると、前記端子監視回路から出力される信号によって前記状態制御回路が動作状態になるように構成されていることを特徴とする請求項1に記載の電源制御用半導体装置。 - 前記トランスの二次側からの出力電圧検出信号が入力される外部入力端子と、
前記電流検出端子および前記外部入力端子の状態を監視して異常状態を検出する異常検出回路と、
を備え、前記異常検出回路が前記電流検出端子の異常を検出すると、前記異常検出回路から出力される信号によって、前記オン、オフ制御信号生成回路の信号生成動作が停止されるとともに前記状態制御回路が動作状態になるように構成されていることを特徴とする請求項2に記載の電源制御用半導体装置。
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JP6859113B2 (ja) * | 2017-01-20 | 2021-04-14 | キヤノン株式会社 | 電源装置及び画像形成装置 |
JP6794856B2 (ja) * | 2017-02-06 | 2020-12-02 | 株式会社リコー | 接地ショート箇所検出装置、接地ショート箇所検出方法及び接地ショート箇所検出プログラム |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011019372A (ja) * | 2009-07-10 | 2011-01-27 | Panasonic Corp | スイッチング電源装置及びスイッチング電源用半導体装置 |
JP2012249524A (ja) * | 2012-09-20 | 2012-12-13 | Sanken Electric Co Ltd | スイッチング電源装置 |
JP2013150456A (ja) * | 2012-01-19 | 2013-08-01 | Rohm Co Ltd | Dc/dcコンバータおよびその制御回路、それを用いた電源装置、電源アダプタおよび電子機器 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0662564A (ja) | 1991-04-05 | 1994-03-04 | Mitsubishi Electric Corp | チョッパ方式スイッチングレギュレータ |
JP4389310B2 (ja) | 1999-11-24 | 2009-12-24 | 富士電機デバイステクノロジー株式会社 | 電源制御集積回路 |
JP5020307B2 (ja) * | 2009-12-07 | 2012-09-05 | 三菱電機株式会社 | 電気負荷の駆動制御装置 |
CN102055310B (zh) * | 2010-11-01 | 2013-09-11 | 崇贸科技股份有限公司 | 具有开回路保护与短路保护的电源供应器 |
JP5757785B2 (ja) * | 2011-05-19 | 2015-07-29 | ローム株式会社 | 電源装置およびそれを用いた電子機器 |
CN103094884B (zh) | 2011-11-08 | 2014-07-30 | 昂宝电子(上海)有限公司 | 保护开路和/或短路状况下的电源变换系统的系统和方法 |
JP2013188093A (ja) * | 2012-03-09 | 2013-09-19 | Konica Minolta Inc | 電源装置 |
US9318965B2 (en) * | 2012-10-10 | 2016-04-19 | Flextronics Ap, Llc | Method to control a minimum pulsewidth in a switch mode power supply |
JP6424644B2 (ja) * | 2015-01-21 | 2018-11-21 | ミツミ電機株式会社 | 電源制御用半導体装置 |
JP6428360B2 (ja) * | 2015-02-23 | 2018-11-28 | ミツミ電機株式会社 | 電源制御用半導体装置 |
JP6443120B2 (ja) * | 2015-02-23 | 2018-12-26 | ミツミ電機株式会社 | 電源制御用半導体装置 |
-
2015
- 2015-02-19 JP JP2015030242A patent/JP6481407B2/ja active Active
-
2016
- 2016-02-05 EP EP16752317.4A patent/EP3261242A4/en not_active Withdrawn
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- 2016-02-05 WO PCT/JP2016/053445 patent/WO2016132930A1/ja active Application Filing
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011019372A (ja) * | 2009-07-10 | 2011-01-27 | Panasonic Corp | スイッチング電源装置及びスイッチング電源用半導体装置 |
JP2013150456A (ja) * | 2012-01-19 | 2013-08-01 | Rohm Co Ltd | Dc/dcコンバータおよびその制御回路、それを用いた電源装置、電源アダプタおよび電子機器 |
JP2012249524A (ja) * | 2012-09-20 | 2012-12-13 | Sanken Electric Co Ltd | スイッチング電源装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3261242A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10052463B2 (en) | 2016-09-12 | 2018-08-21 | Koucky & Volkodav Llc | Shunt systems and methods for removing excess cerebrospinal fluid |
US10926070B2 (en) | 2016-09-12 | 2021-02-23 | Koucky & Volkodav Llc | Shunt systems and methods for removing excess cerebrospinal fluid |
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