CN108988830B - Pulse signal generating circuit capable of programming edge time - Google Patents
Pulse signal generating circuit capable of programming edge time Download PDFInfo
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- CN108988830B CN108988830B CN201810877687.5A CN201810877687A CN108988830B CN 108988830 B CN108988830 B CN 108988830B CN 201810877687 A CN201810877687 A CN 201810877687A CN 108988830 B CN108988830 B CN 108988830B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K2005/00013—Delay, i.e. output pulse is delayed after input pulse and pulse length of output pulse is dependent on pulse length of input pulse
- H03K2005/00078—Fixed delay
- H03K2005/0013—Avoiding variations of delay due to power supply
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Abstract
The invention discloses a pulse signal generating circuit with programmable edge time, which comprises a controller, an isolating circuit, a power switch I and a power switch II, wherein the power switch I is connected with the positive output end of a direct-current power supply, the power switch II is connected with the negative output end of the direct-current power supply, and the controller comprises a rise time modulator and a fall time modulator; the rise time modulator generates a first pulse modulation signal, and the first pulse modulation signal outputs a corresponding first control signal after passing through the isolation circuit so as to control the voltage V between the grid and the source of the power switch Igs(ii) a The falling time modulator generates a second pulse modulation signal, and the second pulse modulation signal outputs a corresponding second control signal after passing through the isolation circuit so as to control the voltage V between the grid and the source of the power switch IIgs. The invention can be widely applied to generating various pulse signals required by the power module test and has strong adaptability.
Description
Technical Field
The invention belongs to the field of signal generation, and particularly relates to a pulse signal generating circuit capable of programming edge time.
Background
The concept of pulse signals is widely applied to the field of electronic information, and a military power supply module generally needs to perform power-off test of 50ms and 200us input, surge voltage test and the like. In the parameter testing process, an input power supply is required to generate various types of specified pulse signals so as to test whether the circuit output meets the requirement of electrical characteristic indexes under the pulse impact. Because the pulse signal is directly connected with a power module to be detected, the pulse signal needs to be capable of generating output of high voltage and large current, but a common signal source cannot generate such signals, if a power supply is adopted to directly output analog pulses through output ON/OFF, the rising and falling time of the output signal is extremely slow and far exceeds the specified time, the pulse time control precision is poor, and short pulse conditions such as 200us power failure cannot be directly generated. In addition, since the input stage circuit of the power module usually has a large-capacity bypass capacitor, a filter capacitor, and the like, it is necessary to perform a discharge process on the input terminal of the product to generate a predetermined pulse signal during a power-off test or the like. Usually, a high-speed electronic switch is used for controlling the generation of such pulse signals, but the edge time of the pulse signals output by such circuits is not controllable, the output pulse time is all over 10ms, and the uncontrollable falling time is still different from the actual application.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a programmable edge-time pulse signal generating circuit, which is used to solve the problem of uncontrollable edge time and fall time of the output pulse signal of the high-speed electronic switch in the prior art.
In order to achieve the above and other related objects, the present invention provides a programmable edge time pulse signal generating circuit, which includes a controller, an isolation circuit, a power switch I and a power switch II, wherein the power switch I is connected to an output positive terminal of a dc power supply, the power switch II is connected to an output negative terminal of the dc power supply, and the controller includes a rise time modulator and a fall time modulator;
the rise time modulator generates a first pulse modulation signal, and the first pulse modulation signal outputs a corresponding first control signal after passing through the isolation circuit so as to control the voltage V between the grid and the source of the power switch Igs；
The falling time modulator generates a second pulse modulation signal, and the second pulse modulation signal outputs a corresponding second control signal after passing through the isolation circuit so as to control the voltage V between the grid and the source of the power switch IIgs。
Preferably, the isolation circuit comprises a first isolation module, a second isolation module, a first isolation power supply and a first smoothing filter module;
the first isolation module performs high-speed switching under a first pulse modulation signal, performs high-speed chopping on direct-current bias voltage generated by a first isolation power supply, and generates a first control signal to control voltage V between a grid electrode and a source electrode of the power switch I after an output signal of the first isolation power supply is filtered by the first smoothing filtering modulegs(ii) a When the edge switching is carried out or the power switch I needs to be turned off, the controller outputs a first switch control signal, and the second isolation module enables the voltage V between the grid electrode and the source electrode of the power switch I to be larger than the voltage V between the grid electrode and the source electrode of the power switch IgsShort circuit, power switchAnd turning off the switch I.
Preferably, the isolation circuit further comprises a resistor connected in parallel between the source and the gate of the power switch I.
Preferably, the first isolated power source comprises a first photovoltaic coupler and a capacitor connected in parallel between two output ends of the first photovoltaic coupler.
Preferably, the first isolation module comprises a first optical coupler and the second isolation module comprises a second optical coupler; the input end of the first optical coupler receives a first pulse modulation signal, and one output end of the first optical coupler is respectively connected with one output end of the second optical coupler and the grid of the power switch I through a resistor; the other output end of the first optical coupler is connected to one output end of the first photovoltaic coupler, the other output end of the first photovoltaic coupler is connected to the other output end of the second optical coupler, and the other output end of the second optical coupler is connected to the source electrode of the power switch I; a capacitor is connected in parallel between the source electrode and the grid electrode of the power switch I, and the drain electrode of the power switch I is connected with the positive output end of a power supply; and the input end of the second optocoupler receives a first switch control signal.
Preferably, the isolation circuit further comprises a third isolation module, a fourth isolation module, a second isolation power supply and a second smoothing filter module;
the third isolation module performs high-speed switching under a second pulse modulation signal, performs high-speed chopping on the direct-current bias voltage generated by the second isolation power supply, and generates a second control signal to control the voltage V between the grid and the source of the power switch II after the output signal of the second isolation power supply is filtered by the second smoothing and filtering modulegs(ii) a When the edge switching is carried out or the power switch II needs to be turned off, the controller outputs a second switch control signal, and the fourth isolation module enables the voltage V between the grid electrode and the source electrode of the power switch IIgsAnd when the short circuit occurs, the power switch II is switched off.
Preferably, the isolation circuit further comprises a resistor connected in parallel between the source and the gate of the power switch II.
Preferably, the second isolated power source comprises a second photovoltaic coupler and a capacitor connected in parallel between two output ends of the second photovoltaic coupler.
Preferably, the third isolation module comprises a third optical coupler and the fourth isolation module comprises a fourth optical coupler; the input end of the third optocoupler receives a second pulse modulation signal, and one output end of the third optocoupler is respectively connected with one output end of the fourth optocoupler and the grid electrode of the power switch II through a resistor; the other output end of the third optical coupler is connected to one output end of the second photovoltaic coupler, the other output end of the second photovoltaic coupler is connected to the other output end of the fourth optical coupler, and the other output end of the fourth optical coupler is connected to the source electrode of the power switch II; a capacitor is connected in parallel between the source electrode and the grid electrode of the power switch II, and the drain electrode of the power switch II is connected with the negative output end of a power supply; and the input end of the fourth optocoupler receives a second switch control signal.
As described above, the pulse signal generating circuit with programmable edge time according to the present invention has the following advantages:
the invention is a simple and practical circuit, can be widely applied to generating various pulse signals required by the power module test, and has strong adaptability. The edge time and the hold time of the pulse signal can be programmed. The control and power switch loop can output high-voltage and large current by adopting an isolation design. The circuit can be controlled by combining a microcontroller or a computer, and has good expandability.
Drawings
FIG. 1 is a schematic block diagram of a pulse signal generating circuit with programmable edge timing according to an embodiment;
fig. 2 is a schematic diagram of a pulse signal generating circuit of programmable edge timing in an embodiment.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
In general, a power switching device such as a power MOS transistor is used to control the voltage (V) between the gate and the sourcegs) Can be used as a switch function by controlling VgsThe rising waveform or voltage level can control the conduction time or conduction degree of the switch.
In the prior art, control VgsThe rising waveform is generally controlled by externally connecting a fixed DC bias voltage and then connecting an R-C circuit structure, but different V is requiredgsThe waveform then requires repeated adjustments to the R-C parameter. The invention adopts pulse bias voltage to charge and discharge a fixed R-C structure, does not need to adjust the parameters of an R-C device, and carries out V by adjusting the signal characteristics of the pulse biasgsAnd (5) controlling the waveform.
Specifically, the invention connects a modulatable V in series with the positive output end of the direct-current power supplygsThe waveform power switch is connected to the output port of the pulse output signal, so that the output of controllable rising edge time can be obtained; v can be modulated by connecting a negative output terminal of a direct-current power supply in parallelgsThe power switch of the waveform is connected to the signal output port, and the output with controllable falling time can be obtained.
As shown in fig. 1, the present invention provides a programmable edge time pulse signal generating circuit, which includes a rise time modulator, a fall time modulator, a pulse time timer, an isolation circuit, a power switch I and a power switch II.
The rising time modulator generates a first pulse modulation signal, the falling time modulator generates a second pulse modulation signal, and the pulse time timer is used for timing the rising/falling edges of the output of the first pulse modulation signal and the second pulse modulation signal and changing the rising/falling edges into the falling/rising edges for output after the set time is reached.
The pulse time timer can control the width of the output pulse signal, and can be realized by adopting the device schemes of MCU, DSP, FPGA or CPLD, etc. and adopting software or hardware.
Further, the rise time modulator, the fall time modulator, and the pulse time timer may be implemented using a single integrated circuit or a plurality of functional integrated circuits. In this embodiment, the rising time modulator, the falling time modulator, and the pulse time timer may be implemented by using a controller, and the controller may be a single chip microcomputer. In yet another embodiment, the controller may receive control instructions from an external controller.
As shown in fig. 2, the controller uses UART to accept commands from the external controller; a Timer1 Timer inside the controller U1 is used as a pulse time Timer; realizing rising and falling time modulation signals by software; the rising time control circuit and the falling time control circuit have the same structure and the same control mode, and are only connected with different power ports.
The controller is connected with an external controller or a computer for program control through the communication port Txd/Rxd. The communication port is not limited to the Txd/Rxd port, and other communication methods supported by the controller, such as IIC, SPI, CAN, and USB, may be used.
The controller sets the pulse signal polarity, rise time, fall time, and pulse hold time. The corresponding pulse bias signals are output by the rise time modulator and the fall time modulator, and the pulse bias signals generate specific control signals after passing through the isolation circuit to control the V of the power switchgsAnd the waveform further realizes the control of the rising or falling time. When a rising signal needs to be generated, the power switch II is turned off firstly, then a first pulse modulation signal is generated through the rising time modulator, and the first pulse modulation signal outputs a corresponding first control signal through the isolation circuit to control the voltage V between the source electrode and the grid electrode of the power switch IgsControlling the on-time of the power switch I so as to control the rise time; when a falling signal needs to be generated, the power switch I is turned off firstly and then passes throughThe time-reducing modulator generates a second pulse modulation signal, and the second pulse modulation signal outputs a corresponding second control signal after passing through the isolation circuit so as to control the voltage V between the source and the gate of the power switch IIgsAnd controlling the on-time of the power switch II so as to control the down-time. The holding time of the pulse is set by the controller when the rising/falling edge is output, and the pulse is changed into falling/rising edge output after the set time is reached. The high value of the pulse signal output is the positive terminal voltage of the output of the external direct current power supply, and the low value of the pulse signal output is the negative terminal voltage of the output of the external direct current power supply.
In this embodiment, the pulse bias signal can be controlled by Pulse Width Modulation (PWM) or Pulse Frequency Modulation (PFM). The PWM and PFM control can be used simultaneously, and the PWM/PFM and the PFM/PWM can be adopted in different time intervals for combined use.
The PWM mode is adopted for control, the higher the duty ratio is, the shorter the switching time is; with PFM control, the higher the pulse frequency, the shorter the switching time. The PWM or PFM modulation can be implemented by MCU, DSP, FPGA or CPLD, etc. using software or hardware to digitally control the duty ratio or frequency.
In this embodiment, the power switch I and the power switch II may be formed by other reasonable power control devices and corresponding circuits, such as MOSFET, JET, and power transistor. The controller can be realized by one or more single-chip microcomputers, digital signal processors, FPGAs or CPLDs in a single or combined mode.
In this embodiment, the isolation circuit includes a first isolation module, a second isolation module, a first isolation power supply, and a first smoothing filter module; the first isolation module performs high-speed switching under the first pulse modulation signal, performs high-speed chopping on the direct-current bias voltage generated by the first isolation power supply, and generates a first control signal to control the voltage V between the grid and the source of the power switch I after the output signal of the first isolation power supply is filtered by the first smoothing and filtering modulegs(ii) a When the edge switching is carried out or the power switch I is required to be turned off, the controller outputs a first switch control signal, and the second isolation moduleConverting the voltage V between the gate and the source of the power switch IgsAnd short circuit, and the power switch I is turned off.
As an improvement to this embodiment, the isolation circuit further includes a resistor connected in parallel between the source and the gate of the power switch I.
Specifically, the first isolated power supply comprises a first photovoltaic coupler and a capacitor connected in parallel between two output ends of the first photovoltaic coupler. The first isolation module comprises a first optical coupler, and the second isolation module comprises a second optical coupler; the input end of the first optical coupler receives a first pulse modulation signal, and one output end of the first optical coupler is respectively connected with one output end of the second optical coupler and the grid of the power switch I through a resistor; the other output end of the first optical coupler is connected to one output end of the first photovoltaic coupler, the other output end of the first photovoltaic coupler is connected to the other output end of the second optical coupler, and the other output end of the second optical coupler is connected to the source electrode of the power switch I; a capacitor is connected in parallel between the source electrode and the grid electrode of the power switch I, and the drain electrode of the power switch I is connected with the positive output end of a power supply; the input end of the second optocoupler receives a first switch control signal.
More specifically, the first isolation module comprises a first optical coupler O1 and a first resistor R1, and the second isolation module comprises a second optical coupler O3 and a third resistor R3; the first isolation power supply comprises a first photovoltaic coupler O2 and a first capacitor C1, and the first capacitor C1 is connected between two output ends of the first photovoltaic coupler O2 in parallel to form an ultra-low ripple isolation power supply; the first smoothing and filtering module comprises a seventh resistor and a third capacitor C3;
an input end of the first optical coupler O1 receives a first pulse modulation signal, and an output end of the first optical coupler O1 is respectively connected with an output end of the second optical coupler O3 and a grid electrode of the first MOS transistor N1 through a seventh resistor R7; the other output end of the first optical coupler O1 is connected to one output end of the first photovoltaic coupler O2, the other output end of the first photovoltaic coupler O2 is connected to the other output end of the second optical coupler O3, and the other output end of the second optical coupler O3 is connected to the source electrode of the first MOS transistor N1; a third capacitor C3 is connected in parallel between the source electrode and the grid electrode of the first MOS transistor N1, and the drain electrode of the MOS transistor N1 is connected with the positive output end of a power supply; an input end of the second optical coupler O3 receives a first switch control signal, the first capacitor C1 is connected in parallel between two output ends of the first photovoltaic coupler O2, and the ninth resistor R9 is connected in parallel between a gate and a source of the first MOS transistor N1.
The drain electrode of the first MOS tube N1 is connected with the output positive terminal of an external direct-current power supply, and the source electrode of the first MOS tube N1 is connected with the pulse signal output positive terminal; the first resistor R1, the second resistor R2 and the third resistor R3 are used for limiting currents flowing through the first optical coupler O1, the first photovoltaic coupler O2 and the second optical coupler O3, and the optical couplers are prevented from being damaged by large currents; the first photovoltaic coupler O2 is used for generating a direct current bias voltage for controlling the first MOS transistor N1, and the instantaneous current output capability of the first photovoltaic coupler O2 can be improved by connecting a first capacitor C1 in parallel at the output end of the first photovoltaic coupler O2; the seventh resistor R7 and the capacitor C3 form a first-order R-C circuit; the first optical coupler O1 is switched on and off at a high speed under a high-speed pulse modulation signal output by the controller, the direct-current bias voltage generated by the first photovoltaic coupler O2 is chopped at a high speed, and the chopped direct-current bias voltage is filtered by a first-order R-C circuit to control the V of the first MOS transistor N1gs1The waveform controls the conduction time of the first MOS transistor N1, and the control of the rising time is realized; the second optical coupler O3 is used for rapidly switching off the first MOS tube N1, when the edge is switched or the first MOS tube N1 needs to be switched off, the controller outputs low level, and the second optical coupler O3 immediately switches the V of the first MOS tube N1gs1The voltage is short-circuited, and the first MOS transistor N1 is immediately turned off; the ninth resistor R9 is used for connecting the third capacitor C3 and the parasitic capacitor C of the first MOS transistor N1 under abnormal conditionsgs1The charge drains off and turns off the first MOS transistor N1.
In this embodiment, the isolation circuit further includes a third isolation module, a fourth isolation module, a second isolation power supply, and a second smoothing filter module;
the third isolation module performs high-speed switching under a second pulse modulation signal, performs high-speed chopping on the direct-current bias voltage generated by the second isolation power supply, and generates a second control signal to control the voltage V between the grid and the source of the power switch II after the output signal of the second isolation power supply is filtered by the second smoothing and filtering modulegs(ii) a When the edge switching is carried out or the power switch II needs to be turned off, the controller outputs a second switch control signal, and the fourth isolation module enables the grid electrode and the source electrode of the power switch II to be connected with the source electrodeVoltage V betweengsAnd when the short circuit occurs, the power switch II is switched off.
For the improvement of this embodiment, the isolation circuit further includes a resistor connected in parallel between the source and the gate of the power switch II.
Specifically, the third isolation module comprises a third optocoupler, and the fourth isolation module comprises a fourth optocoupler; the input end of the third optocoupler receives a second pulse modulation signal, and one output end of the third optocoupler is respectively connected with one output end of the fourth optocoupler and the grid electrode of the power switch II through a resistor; the other output end of the third optical coupler is connected to one output end of the second photovoltaic coupler, the other output end of the second photovoltaic coupler is connected to the other output end of the fourth optical coupler, and the other output end of the fourth optical coupler is connected to the source electrode of the power switch II; a capacitor is connected in parallel between the source electrode and the grid electrode of the power switch II, and the drain electrode of the power switch II is connected with the negative output end of a power supply; and the input end of the fourth optocoupler receives a second switch control signal.
More specifically, the isolation circuit further comprises a third isolation module, a fourth isolation module, a second isolation power supply and a second smoothing filter module, wherein the third isolation module comprises a third optical coupler O4 and a fourth resistor R4, and the fourth isolation module comprises a fourth optical coupler O6 and a sixth resistor R6; the second isolation power supply comprises a second photovoltaic coupler O5 and a second capacitor C2, and the second capacitor C2 is connected between two output ends of the second photovoltaic coupler O5 in parallel to form the ultra-low ripple isolation power supply; the second smoothing and filtering module comprises an eighth resistor R8 and a fourth capacitor C4.
An input end of the third optical coupler O4 receives a second pulse modulation signal, and an output end of the third optical coupler O4 is respectively connected with an output end of the fourth optical coupler O6 and a grid electrode of the second MOS transistor N2 through an eighth resistor R8; the other output end of the third optical coupler O4 is connected to one output end of the second photovoltaic coupler O5, a second capacitor C2 is connected between two output ends of the second photovoltaic coupler O5 in parallel, the other output end of the photovoltaic coupler O5 is connected to the other output end of the fourth optical coupler O6, and the other output end of the fourth optical coupler O6 is connected to the source electrode of the second MOS tube N2; a fourth capacitor C4 is connected in parallel between the source electrode and the grid electrode of the second MOS transistor N2, and the drain electrode of the second MOS transistor N2 is connected with the negative output end of a power supply; an input end of the fourth optical coupler O6 receives a second switch control signal.
The drain electrode of the second MOS tube N2 is connected with the positive end of the pulse signal output, and the source electrode is connected with the negative end of the external power supply; the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are used for limiting currents flowing through the third optical coupler O4, the second photovoltaic coupler O5 and the fourth optical coupler O6, and the optical couplers are prevented from being damaged by large currents; the second photovoltaic coupler O5 is used for generating a direct current bias voltage for controlling the second MOS transistor N2, and the instantaneous current output capability of the second photovoltaic coupler O5 can be improved by connecting a second capacitor C2 in parallel at the two ends of the output of the second photovoltaic coupler O5; the eighth resistor R8 and the fourth capacitor C4 form a first-order R-C circuit; the second optical coupler O4 is switched on and off at high speed under the high-speed pulse modulation signal output by the controller, the direct-current bias voltage generated by the second photovoltaic coupler O5 is chopped at high speed, and after the direct-current bias voltage is filtered by a first-order R-C circuit, the V of the second MOS transistor N2 can be controlledgs2The waveform controls the conduction time of the second MOS transistor N2, and the control of the falling time is realized; the fourth optical coupler O6 is used for rapidly switching off the second MOS tube N2, when the edge is switched or the second MOS tube N2 needs to be switched off, the controller outputs low level, and the fourth optical coupler O6 immediately switches the V of the second MOS tube N2gs2The voltage is short-circuited, and the second MOS transistor N2 is immediately turned off; the tenth resistor R10 is used for connecting the fourth capacitor C4 and the parasitic capacitor C of the second MOS transistor N2 under abnormal conditionsgs2The charge is discharged and turns off the second MOS transistor N2.
In this embodiment, the isolation circuit is an optoelectronic isolation device, but in other embodiments, the isolation circuit may be composed of a magnetic isolation device and a corresponding circuit.
In the present embodiment, the first photovoltaic coupler O2 and the first capacitor C1, the second photovoltaic coupler O5 and the second capacitor C2 constitute an ultra-low ripple isolation power supply. The ultra-low ripple isolation power supply generates direct current bias voltage for controlling the first MOS transistor N1 and the second MOS transistor N2. In other embodiments, the ultra-low ripple isolated power supply may also be generated by using other isolated power supplies in combination with corresponding circuits, such as a DC/DC converter with a filter circuit.
In the present embodiment, the seventh resistor R7, the third capacitor C3, the eighth resistor R8 and the fourth capacitor C4 constitute a smoothing filter module. In other embodiments, the smoothing filter module may be formed by an L-C, pi, or T filter circuit.
The circuit structure of the invention is novel, and can be used for generating pulse signals for various power supply tests; the edge time of the pulse signal is digitally controlled, and the signal repeatability is good; the circuit adopts isolation control, and has strong anti-interference capability; the pulse power is high, and high-voltage large current can be output; the ripple of the power supply at the circuit isolation side is extremely low, and the interference to the pulse output end is not generated.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A pulse signal generating circuit with programmable edge time is characterized by comprising a controller, an isolating circuit, a power switch I and a power switch II, wherein the power switch I is connected with the positive output end of a direct-current power supply, the power switch II is connected with the negative output end of the direct-current power supply, and the controller comprises a rise time modulator and a fall time modulator;
the rise time modulator generates a first pulse modulation signal, and the first pulse modulation signal outputs a corresponding first control signal after passing through the isolation circuit so as to control the voltage V between the grid and the source of the power switch Igs；
The falling time modulator generates a second pulse modulation signal, and the second pulse modulation signal outputs a corresponding second control signal after passing through the isolation circuit so as to control the voltage V between the grid and the source of the power switch IIgs；
The isolation circuit comprises a first isolation module, a second isolation module, a first isolation power supply and a first smooth filtering module;
the first isolation module modulates in a first pulseHigh-speed switching is carried out under signals, high-speed chopping is carried out on direct-current bias voltage generated by the first isolation power supply, output signals of the first isolation power supply are filtered by the first smoothing filtering module, and first control signals are generated to control voltage V between a grid electrode and a source electrode of the power switch Igs(ii) a When the edge switching is carried out or the power switch I needs to be turned off, the controller outputs a first switch control signal, and the second isolation module enables the voltage V between the grid electrode and the source electrode of the power switch I to be larger than the voltage V between the grid electrode and the source electrode of the power switch IgsShort circuit, the power switch I is turned off;
the isolation circuit further comprises a third isolation module, a fourth isolation module, a second isolation power supply and a second smooth filtering module;
the third isolation module performs high-speed switching under a second pulse modulation signal, performs high-speed chopping on the direct-current bias voltage generated by the second isolation power supply, and generates a second control signal to control the voltage V between the grid and the source of the power switch II after the output signal of the second isolation power supply is filtered by the second smoothing and filtering modulegs(ii) a When the edge switching is carried out or the power switch II needs to be turned off, the controller outputs a second switch control signal, and the fourth isolation module enables the voltage V between the grid electrode and the source electrode of the power switch IIgsAnd when the short circuit occurs, the power switch II is switched off.
2. The programmable edge-time pulse signal generating circuit as claimed in claim 1, wherein the isolation circuit further comprises a resistor connected in parallel between the source and the gate of the power switch I.
3. The programmable edge-time pulse signal generating circuit of claim 1, wherein the first isolated power supply comprises a first photovoltaic coupler and a capacitor connected in parallel between two output terminals of the first photovoltaic coupler.
4. The programmable edge time pulse signal generating circuit of claim 3, wherein the first isolation module comprises a first optical coupler and the second isolation module comprises a second optical coupler; the input end of the first optical coupler receives a first pulse modulation signal, and one output end of the first optical coupler is respectively connected with one output end of the second optical coupler and the grid of the power switch I through a resistor; the other output end of the first optical coupler is connected to one output end of the first photovoltaic coupler, the other output end of the first photovoltaic coupler is connected to the other output end of the second optical coupler, and the other output end of the second optical coupler is connected to the source electrode of the power switch I; a capacitor is connected in parallel between the source electrode and the grid electrode of the power switch I, and the drain electrode of the power switch I is connected with the positive output end of a power supply; and the input end of the second optocoupler receives a first switch control signal.
5. The programmable edge-time pulse signal generating circuit as claimed in claim 1, wherein the isolation circuit further comprises a resistor connected in parallel between the source and the gate of the power switch II.
6. The programmable edge-time pulse signal generating circuit of claim 1, wherein the second isolated power supply comprises a second photovoltaic coupler and a capacitor connected in parallel between two output terminals of the second photovoltaic coupler.
7. The programmable edge time pulse signal generating circuit of claim 1, wherein the third isolation module comprises a third optocoupler, and the fourth isolation module comprises a fourth optocoupler; the input end of the third optocoupler receives a second pulse modulation signal, and one output end of the third optocoupler is respectively connected with one output end of the fourth optocoupler and the grid electrode of the power switch II through a resistor; the other output end of the third optical coupler is connected to one output end of the second photovoltaic coupler, the other output end of the second photovoltaic coupler is connected to the other output end of the fourth optical coupler, and the other output end of the fourth optical coupler is connected to the source electrode of the power switch II; a capacitor is connected in parallel between the source electrode and the grid electrode of the power switch II, and the drain electrode of the power switch II is connected with the negative output end of a power supply; and the input end of the fourth optocoupler receives a second switch control signal.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203340040U (en) * | 2013-07-19 | 2013-12-11 | 北京益弘泰科技发展有限责任公司 | Isolated pulse edge remote control circuit |
| CN103873017A (en) * | 2012-12-10 | 2014-06-18 | 北京普源精电科技有限公司 | Device and method for improving pulse edge time resolution |
| CN105811798A (en) * | 2016-05-03 | 2016-07-27 | 湖北大学 | Fast-edge high-frequency and high-voltage pulse power supply |
| CN108322198A (en) * | 2018-02-10 | 2018-07-24 | 西安交通大学 | A kind of control system and method for bipolar high-voltage pulse power source |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4649467A (en) * | 1985-07-31 | 1987-03-10 | United Technologies Corporation | High efficiency MOSFET sine wave generator |
| CN202256476U (en) * | 2011-09-30 | 2012-05-30 | 海信科龙电器股份有限公司 | Zero passage signal detection circuit |
| CN102468825A (en) * | 2011-11-25 | 2012-05-23 | 中国船舶重工集团公司第七二四研究所 | Realization method of optocoupler drive-based broad impulse grid control modulator |
| CN102545552B (en) * | 2012-02-23 | 2014-06-18 | 崔聪林 | Matching circuit and large-power pulse power supply using same |
| CN104811082B (en) * | 2015-05-04 | 2017-07-11 | 中国电子科技集团公司第二十四研究所 | A kind of nanosecond rising edge pulse power supply |
| CN105099422A (en) * | 2015-08-19 | 2015-11-25 | 深圳市华星光电技术有限公司 | Optical coupling isolation switch circuit |
-
2018
- 2018-08-03 CN CN201810877687.5A patent/CN108988830B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103873017A (en) * | 2012-12-10 | 2014-06-18 | 北京普源精电科技有限公司 | Device and method for improving pulse edge time resolution |
| CN203340040U (en) * | 2013-07-19 | 2013-12-11 | 北京益弘泰科技发展有限责任公司 | Isolated pulse edge remote control circuit |
| CN105811798A (en) * | 2016-05-03 | 2016-07-27 | 湖北大学 | Fast-edge high-frequency and high-voltage pulse power supply |
| CN108322198A (en) * | 2018-02-10 | 2018-07-24 | 西安交通大学 | A kind of control system and method for bipolar high-voltage pulse power source |
Non-Patent Citations (1)
| Title |
|---|
| 一种快沿脉冲信号发生器的设计;徐碧辉 等;《电子设计工程》;20160930;第24卷(第18期);第66-68页 * |
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