CN113364261B - Integrated driving module - Google Patents

Integrated driving module Download PDF

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Publication number
CN113364261B
CN113364261B CN202010138231.4A CN202010138231A CN113364261B CN 113364261 B CN113364261 B CN 113364261B CN 202010138231 A CN202010138231 A CN 202010138231A CN 113364261 B CN113364261 B CN 113364261B
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signal
driving
control signal
electrically connected
output
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CN113364261A (en
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邱瑞阳
叶家安
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Acbel Polytech Inc
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Acbel Polytech Inc
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/36Means for starting or stopping converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/44Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion 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
    • H02M3/325Conversion 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
    • H02M3/335Conversion 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
    • H02M3/33561Conversion 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 having more than one ouput with independent control
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion 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
    • H02M3/325Conversion 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
    • H02M3/335Conversion 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
    • H02M3/33569Conversion 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 having several active switching elements

Abstract

The invention provides an integrated driving module, which comprises an oscillator, a pulse width modulation unit, a soft start controller, a first driver and a second driver, wherein the oscillator is connected with a voltage input end to generate an oscillation signal, the pulse width modulation unit receives the oscillation signal and generates a first driving control signal and a second driving control signal which are mutually opposite in phase, and the first driver and the second driver respectively generate a first driving output signal and a second driving output signal according to the first driving control signal and the second driving control signal and respectively output by an output end; the integrated driving module can provide two opposite phase driving signals required by two isolated power supplies only by four connecting ends of a voltage input end, two output ends and a grounding end, so that wiring and input pins of the primary side of the transformer are simplified, and circuit design limitation and cost are reduced.

Description

Integrated driving module
Technical Field
A driving module, in particular to an integrated driving module for generating mutually isolated power.
Background
Along with the increasing demands of the market for the product efficiency of the power supply, the traditional power factor correction (Power Factor Correction; PFC) circuit mainly utilizes a rectifying diode to rectify, so that the circuit loss is large, and the traditional PFC circuit is improved to form a bridgeless PFC circuit. Referring to fig. 9A, a Totem Pole (Totem Pole) circuit is often used in the PFC circuit to improve the conversion efficiency of the power converter. Although the totem pole circuit can improve the conversion efficiency, the two high side switches H1 and H2 need to be driven by the first switch driver 81 and the second switch driver 82, respectively, which are isolated from the input power.
In the isolation driving mode, a transformer coupling mode can be mainly adopted. Referring to fig. 9B, the primary winding and the secondary winding on both sides of the transformer T achieve an isolation function, and the turns ratio of the primary winding and the secondary winding can be adjusted to the voltage ratio on both sides. The primary side is connected with a driving module to improve current driving capability, the driving module receives a pulse width modulation signal PWM1 and a pulse width modulation signal PWM2, the pulse width modulation signal PWM1 and the pulse width modulation signal PWM2 are 180 degrees out of phase, and the driver synthesizes an alternating current signal on the primary side of the transformer T. Through the isolation of the transformer T, the power MOS1 and the power MOS2 are rectified at the secondary side and provided to the first switch driver 81 and the second switch driver 82 to drive the switch H1 and the switch H2, and the purpose of providing the isolation driving of the switch H1 and the switch H2 is achieved.
However, the PWM signals PWM1 and PWM2 required by the driving module are usually provided by a digital signal processor (Digital Signal Processor; DSP) of a control board that is additionally provided, and the control board requires an additional circuit layout and occupies the space inside the power supply. The control board is connected to the driver via the circuit, and the circuit is easy to be interfered by noise signal, so that the driving signal is distorted, and the switch is caused to malfunction. In addition, the pulse width modulation signal PWM1 and the pulse width modulation signal PWM2 occupy two output channels of the control board, the lower-order DSP is not used, and the higher-order DSP is needed to be selected, so that the cost of the whole power converter is higher.
Disclosure of Invention
In view of the fact that the power factor correction circuit of the existing power supply needs to input two inverted pwm signals to generate the isolated driving signal, and in the prior art, a control board must be additionally provided to provide the two pwm signals, which results in complex circuit layout and is easy to be interfered by noise signals, thereby increasing the manufacturing cost, the invention provides an integrated driving module for connecting a dc blocking unit on the primary side of a transformer; the integrated driving module comprises:
the oscillator is electrically connected with a voltage input end to receive a power supply voltage and generate an oscillating signal according to the power supply voltage;
the pulse width modulation unit is electrically connected with the oscillator and generates a first driving control signal and a second driving control signal which are mutually opposite in phase according to the oscillating signal;
a soft start controller electrically connected to the voltage input terminal and the pulse width modulation unit;
the first driver is electrically connected with the pulse width modulation unit, a first output end and a grounding end, receives the first driving control signal, generates a first driving output signal and outputs the first driving output signal through the first output end;
the second driver is electrically connected with the pulse width modulation unit, a second output end and the grounding end, receives the second driving control signal, generates a second driving output signal and outputs the second driving output signal through the second output end.
The integrated driving module comprises the voltage input end, the grounding end, the first output end and the second output end, and provides two mutually opposite first and second driving output signals, wherein the first driving output signal and the second driving output signal are used for an alternating current synthesizing unit to synthesize an alternating current signal and are provided for a primary side winding of a transformer, and the transformer outputs two mutually isolated driving voltages by two secondary side windings and are respectively used for driving two high-side switches in a power factor correction circuit.
That is, by setting the integrated driving module of the present invention, the primary side of the power converter does not need to be connected to a control board provided in addition through an additional line and an input end to obtain the two pwm signals, so that the line is prevented from being too long or the noise signal interference is prevented from increasing. In addition, the additional control board and the digital processor thereof do not need to additionally add two output channels, thereby achieving the purpose of simplifying the overall circuit design of the power supply.
Drawings
FIG. 1 is a schematic diagram of the block connection of an integrated driving module according to the present invention;
FIG. 2 is a schematic block diagram of an integrated driving module according to a first preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of an application connection of a first embodiment of an integrated driving module according to the present invention;
FIG. 4 is a schematic block diagram of a third embodiment of an integrated driving module according to the present invention;
FIG. 5 is a voltage signal waveform diagram of a third embodiment of an integrated driving module according to the present invention;
FIG. 6 is a voltage signal waveform diagram of a fourth embodiment of the integrated driving module according to the present invention;
FIG. 7 is a schematic block diagram of an integrated driving module according to a fifth embodiment of the present invention;
FIG. 8 is a schematic block diagram of an integrated driving module according to a sixth preferred embodiment of the present invention;
FIG. 9A is a schematic diagram of a prior art power supply circuit;
fig. 9B is a schematic diagram of an isolated driving module of a power factor correction circuit of a prior art power supply.
Detailed Description
Referring to fig. 1 and 2, the present invention provides an integrated driving module 10 for connecting a dc blocking unit 20 on a primary side of a transformer T. The integrated driving module 10 includes an oscillator OSC, a PWM unit PWM, a soft start controller SSL, a first driver D1 and a second driver D2. The oscillator OSC is electrically connected to a voltage input terminal VCC to receive a power supply voltage and generate an oscillation signal according to the power supply voltage, the PWM unit PWM is electrically connected to the oscillator OSC and generates a first driving control signal and a second driving control signal that are mutually inverted according to the oscillation signal, the soft start controller SSL is electrically connected to the voltage input terminal VCC and the PWM unit PWM, and when the soft start controller SSL receives a start voltage from the voltage input terminal VCC, the soft start controller SSL controls a slow start program of the PWM unit PWM. The first driver D1 is electrically connected to the PWM unit PWM, a first output terminal O/P1, and a ground terminal GND, receives the first driving control signal, generates a first driving output signal, and outputs the first driving output signal from the first output terminal O/P1, and the second driver D2 is electrically connected to the PWM unit PWM, a second output terminal O/P2, and the ground terminal GND, receives the second driving control signal, generates a second driving output signal, and outputs the second driving output signal from the second output terminal O/P2.
Referring to fig. 2, in a first preferred embodiment of the present invention, the first driver and the second driver are electrically connected to the voltage input terminal, so as to convert the power supply voltage of the voltage input terminal into the first driving output signal and the second driving output signal according to the first driving control signal and the second control signal. That is, the driving output high potential of the present embodiment is provided by the power supply voltage of the driving module.
Fig. 3 is a circuit diagram of an integrated driving module 10 applied to a primary side isolation driving voltage supply circuit of a power supply according to a first preferred embodiment of the present invention. As shown in fig. 3, the integrated driving module 10 has four external connection terminals, wherein only the voltage input terminal VCC is required to receive a power supply voltage, and the integrated driving module 10 can generate two driving output signals with opposite phases from the first output terminal O/P1 and the second output terminal O/P2 independently, so that the dc blocking unit 20 generates an ac signal to be provided to the primary side of the transformer T.
Referring to fig. 4, in a second preferred embodiment of the present invention, the first driver D1 includes a first driving switch M1, the first driving switch M1 is electrically connected between the first output terminal O/P1 and the ground terminal GND, and has a first control terminal electrically connected to the first driving control output terminal C1; the second driver D2 includes a second driving switch M2, where the second driving switch M2 is electrically connected between the second output terminal O/P2 and the ground terminal GND, and has a second control terminal electrically connected to the second driving control output terminal C2. The first driver D1 and the second driver D2 of the preferred embodiment are Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) with Open Drain (Open Drain) output. In addition, the first driver D1 and the second driver D2 may also be bipolar transistors with Open Collector (Open Collector) output, which is not limited in this disclosure. The output high voltage of the first driver D1 and the second driver D2 in the preferred embodiment is provided by another external voltage source.
The two preferred embodiments are respectively a high voltage provided by a power supply voltage in the driving module and different output modes provided by an external voltage source for outputting the high voltage, and can be selected according to the requirements of circuit design, and the invention is not limited herein.
With continued reference to fig. 4, in a third preferred embodiment of the present invention, the PWM unit PWM includes a flip-flop FF and a dead time generator DTG (Dead Time Generator). The flip-flop FF has an input terminal TIN, a first square wave output terminal Q and a second square wave output terminal Q ', and the input terminal TIN of the flip-flop FF is electrically connected to the oscillator OSC to receive the oscillating signal, and generates a first square wave signal and a second square wave signal that are opposite to each other according to the oscillating signal, the first square wave signal is output by the first square wave output terminal Q, and the second square wave signal is output by the second square wave output terminal Q'. The dead time generator DTG has a first driving control output C1 and a second driving control output C2, and is electrically connected to the first square wave output Q and the second square wave output Q' of the flip-flop FF, respectively, to receive the first square wave signal and the second square wave signal. The dead time generator DTG generates the first driving control signal and the second driving control signal according to the first square wave signal and the second square wave signal, and outputs the first driving control signal and the second driving control signal from the first driving control output terminal C1 and the second driving control output terminal C2. The dead time generator DTG delays a rising edge (rising edge) of the first driving control signal by a delay time compared with a rising edge of the first square wave signal, and delays a rising edge of the second driving control signal by the delay time compared with a rising edge of the second square wave signal.
Referring to fig. 5, the first driving control signal and the second driving control signal control the on states of the first driver D1 and the second driver D2 respectively, so that the first output terminal O/P1 and the second output terminal O/P2 output the first driving output signal V respectively O/P1 The second driving output signal V O/P2 The first driving output signalNumber V O/P1 The second driving output signal V O/P2 Is mutually inverted and has the delay time t between the times of switching to the high potential d . Thus, the first driving output signal V is ensured O/P1 The second driving output signal V O/P2 The first driver D1 and the second driver D2 are not simultaneously turned on to generate an irregular noise signal. Referring to FIG. 3, two ends of the DC blocking unit 20 are connected to the first output terminal O/P1 and the second output terminal O/P2 respectively to receive the potential difference V between the first output terminal O/P1 and the second output terminal O/P2 (O/P1-O/P2) And the potential difference signal V between the first output terminal O/P1 and the second output terminal O/P2 (O/P1-O/P2) Is generated as an ac signal to be supplied to the primary side of the transformer.
In a fourth preferred embodiment of the present invention, the soft start controller SSL is electrically connected to the dead zone generator DTG to control the delay time t generated by the dead zone generator DTG when the integrated driving module 10 receives a start voltage to start operation d The aim of soft start of the pulse width modulation unit PWM is fulfilled. Referring to fig. 6, when the soft start controller SSL receives a start voltage from the supply voltage input terminal VCC, the soft start controller SSL outputs a soft start control signal to the dead time generator DTG, so that the dead time generator DTG controls the delay time t according to the soft start control signal d From an initial delay time t d1 Gradually decrease to a stable delay time t ds The duty ratios of the first driving control signal and the second driving control signal are gradually increased from a lower initial duty ratio to a stable duty ratio when the integrated driving module 10 starts to operate, so as to achieve the purpose of soft start.
In addition, as shown in fig. 7, the integrated driving module 10 preferably further includes a low dropout regulator LDO electrically connected to the voltage input terminal VCC, such that the oscillator OSC and the soft start controller SSL are electrically connected to the voltage input terminal VCC through the low dropout regulator LDO. The LDO receives the supply voltage, performs a low dropout voltage regulation on the supply voltage, and provides a regulated voltage to the soft start controller SSL and the oscillator OSC.
Referring still to fig. 7, in a fifth preferred embodiment of the present invention, the integrated driving module 10 further includes a control terminal CTRL electrically connected to the oscillator OSC and the dead time generator DTG of the PWM unit PWM. The control end CTRL is configured to receive a control signal, the oscillator OSC controls the frequency of the oscillating signal according to the control signal, and the dead time generator DTG generates a corresponding delay time according to the control signal.
The control signal received by the control terminal CTRL is, for example, a digital signal, i.e., a high level signal or a low level signal, when the control signal is the high level signal, the oscillation signal generated by the oscillator OSC is a first frequency, and the dead time generated by the dead time generator DTG corresponds to a first time. When the control signal is the low-level signal, the oscillation signal generated by the oscillator OSC is at a second frequency, and the dead time generated by the dead time generator DTG corresponds to a second time.
In a sixth preferred embodiment of the present invention, the control terminal CTRL is electrically connected to an external variable resistor for generating an externally adjustable voltage signal. The oscillator OSC and the dead time generator DTG generate an oscillation signal and a delay time with corresponding frequencies according to the voltage signal.
Referring to fig. 8, in a seventh preferred embodiment of the present invention, the oscillator OSC is electrically connected to the soft start controller SSL, and when the soft start controller SSL receives the supply voltage from the voltage input terminal VCC or through the low dropout regulator LDO, the soft start controller SSL outputs the soft start control signal to the oscillator OSC to trigger the generation of the oscillation signal of the oscillator OSC.
In summary, the integrated driving module 10 of the present invention includes the control end CTRL with only five input ends, and can provide two opposite phase driving signals needed by two isolated driving voltages generated by the transformer in the primary side driving circuit of the power supply.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.

Claims (8)

1. An integrated drive module for connecting to a primary winding of a transformer, comprising:
the oscillator is electrically connected with a voltage input end to receive a power supply voltage and generate an oscillating signal according to the power supply voltage;
the pulse width modulation unit is electrically connected with the oscillator and generates a first driving control signal and a second driving control signal which are mutually opposite in phase according to the oscillating signal;
a soft start controller electrically connected with the voltage input end and the pulse width modulation unit;
the first driver is electrically connected with the pulse width modulation unit, a grounding end and a first output end, receives the first driving control signal, generates a first driving output signal and outputs the first driving output signal through the first output end;
the second driver is electrically connected with the pulse width modulation unit, the grounding end and a second output end, receives the second driving control signal, generates a second driving output signal and outputs the second driving output signal through the second output end;
the first driving output signal and the second driving output signal are used for the direct current resistance unit to synthesize an alternating current signal, the alternating current signal is provided to a primary side winding of the transformer, and the transformer outputs two driving voltages which are isolated from each other by two secondary side windings and are respectively used for driving two high side switches in a power factor correction circuit.
2. The integrated drive module of claim 1, wherein the pulse width modulation unit comprises:
a flip-flop having an input terminal, a first square wave output terminal, and a second square wave output terminal; the input end of the flip-flop is electrically connected with the oscillator to receive the oscillating signal and generate a first square wave signal and a second square wave signal which are mutually inverted;
the dead time generator is provided with a first driving control output end and a second driving control output end, and is electrically connected with the first square wave output end and the second square wave output end of the flip-flop so as to receive the first square wave signal and the second square wave signal and generate the first driving control signal and the second driving control signal according to the first square wave signal and the second square wave signal;
the dead time generator delays a rising edge of the first driving control signal by a delay time than a rising edge of the first square wave signal, and delays a rising edge of the second driving control signal by the delay time than a rising edge of the second square wave signal.
3. The integrated drive module of claim 2, wherein,
when the soft start controller receives a start voltage from the power supply voltage input end, the soft start controller outputs a soft start control signal to the dead time generator, so that the dead time generator controls the delay time to gradually decrease from an initial delay time to a stable delay time according to the soft start control signal.
4. The integrated driving module according to claim 2, wherein the oscillator and the pwm unit are electrically connected to a control terminal, and the control terminal receives a control signal; wherein,
the oscillator controls the frequency of the oscillating signal according to the control signal;
the dead time generator controls delay times of the first driving control signal and the second driving control signal compared with the first square wave signal and the second square wave signal according to the control signal.
5. The integrated driving module according to claim 4, wherein the control signal received by the control terminal is a high level signal or a low level signal;
when the control signal is the high potential signal, the oscillation signal generated by the oscillator is a first frequency, and the delay time generated by the dead time generator is a first time;
when the control signal is the low potential signal, the oscillation signal generated by the oscillator is a second frequency, and the delay time generated by the dead time generator is a second time.
6. The integrated drive module of claim 4, wherein the control terminal is configured to electrically connect to a variable resistor.
7. The integrated drive module of claim 2, wherein,
the first driver comprises a first driving switch which is electrically connected between the first output end and a grounding end and is provided with a first control end, and the first control end is electrically connected with the first driving control output end;
the second driver comprises a second driving switch, the second driving switch is electrically connected between the second output end and the grounding end and is provided with a second control end, and the second control end is electrically connected with the second driving control output end.
8. The integrated drive module of claim 1, further comprising:
the low-dropout voltage regulator is electrically connected to the voltage input end, receives the power supply voltage and performs low-dropout voltage regulation to generate a stable voltage; the oscillator is electrically connected with the voltage input end through the low dropout voltage regulator.
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CN109980975A (en) * 2019-03-20 2019-07-05 中山职业技术学院 High-frequency inverter and its Unipolar sinusoidal pulse width modulation method, computer readable storage medium
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