CN112769337B - Modulation type transformer isolation driving circuit independent of switching frequency - Google Patents
Modulation type transformer isolation driving circuit independent of switching frequency Download PDFInfo
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- CN112769337B CN112769337B CN202011642195.1A CN202011642195A CN112769337B CN 112769337 B CN112769337 B CN 112769337B CN 202011642195 A CN202011642195 A CN 202011642195A CN 112769337 B CN112769337 B CN 112769337B
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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
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
The invention discloses a modulation type isolation driving circuit irrelevant to switching frequency, which comprises an isolation driving transformer, a modulation module and a demodulation module; the modulation module comprises: the high-frequency signal generating unit is used for generating a fundamental wave signal and carrying out magnetic reset on the isolation driving transformer; the pulse signal generating unit is used for generating a first PWM pulse signal, and the frequency of a fundamental wave signal is greater than the switching frequency of the first PWM pulse signal; performing high-frequency modulation on the first PWM pulse signal by using a fundamental wave signal to generate a modulation signal with the switching frequency equal to that of the first PWM pulse signal, and transmitting the modulation signal to a primary coil of the isolation driving transformer; the demodulation module is used for converting the modulation signal output by the secondary coil of the isolation driving transformer into a signal with the sum of duty ratios equal to the frequency of the first PWM pulse signal and 1. The invention solves the problem that the common isolation transformer can not work at low switching frequency, and can greatly reduce the size of a switching device. The circuit is simple and practical and is convenient to popularize and apply.
Description
Technical Field
The invention belongs to the technical field of electrical equipment, and particularly relates to a modulation type transformer isolation driving circuit independent of switching frequency.
Background
The transformer isolation driving types at the present stage are various, and the single-capacitor transformer isolation driving is typical, so that the circuit is simple, a separate auxiliary power supply is not needed for power supply, and no additional parasitic interference is introduced, but the defect is obvious, and the magnetic reset is performed by using the switching frequency, so that the magnetic reset circuit is only suitable for occasions with higher frequencies; when the switching frequency is low, the low switching frequency cannot support the magnetic reset of the transformer, and a magnetic member with larger volume must be used, so that the application scene is limited.
As a special application scene, the submarine observation network generally adopts a high-voltage constant-current power supply mode, and higher requirements are put forward on a driving circuit. In a two-stage working mode of converting constant current into constant voltage, due to the particularity of the constant current source, the input voltage can change in a wide range according to the load size, the maximum voltage can reach dozens of kv, and the additional auxiliary power supply of the driving circuit is very difficult to design due to high voltage; in some cases, the operating frequency of the switching device is low, but due to space limitation, the volume of the magnetic device cannot be too large, and the requirement of the common transformer isolation drive is difficult to meet.
Disclosure of Invention
Aiming at least one defect or improvement requirement in the prior art, the invention provides a modulation type transformer isolation driving circuit independent of switching frequency, and aims to solve the problem that the change range of the duty ratio in the transformer isolation driving circuit is too large, and the transformer cannot perform magnetic reset, so that the volume of a magnetic piece is too large.
To achieve the above object, according to an aspect of the present invention, there is provided a modulation type transformer isolation driving circuit including:
the modulation module is connected with a primary coil of the isolation driving transformer, and the demodulation module is connected with a secondary coil of the isolation driving transformer; wherein the modulation module comprises:
the high-frequency signal generating unit is used for generating a fundamental wave signal and carrying out magnetic reset on the isolation driving transformer;
a pulse signal generating unit for generating a first PWM pulse signal, a frequency of the fundamental wave signal being greater than a switching frequency of the first PWM pulse signal; the pulse signal generating unit performs high-frequency modulation on the first PWM pulse signal by using a fundamental wave signal, generates a modulation signal with the switching frequency equal to that of the first PWM pulse signal, and transmits the modulation signal to a primary coil of the isolation driving transformer;
the demodulation module is used for converting the modulation signal output by the secondary coil of the isolation driving transformer into an inverted signal of the first PWM pulse signal.
Preferably, the pulse signal generating unit includes a first control circuit and a first electronic switch;
the first control circuit is used for generating a first PWM pulse signal so as to control the on or off of the first electronic switch;
the first end of the first electronic switch is connected with the output end of the first control circuit to receive the first PWM pulse signal, and the second end and the third end of the first electronic switch are connected with the output end of the high-frequency signal generating unit and form a series loop with a primary coil of the isolation driving transformer;
when the first PWM pulse signal output by the first control circuit is at a high level, the first electronic switch is in a conducting state, the primary coil of the isolation driving transformer is short-circuited, and the secondary coil outputs a low-level modulation signal;
when the first PWM pulse signal output by the first control circuit is at a low level, the first electronic switch is in a cut-off state, a fundamental wave signal generated by the high-frequency signal generating unit is transmitted to the primary coil of the isolation driving transformer, and the secondary coil outputs a high-level modulation signal.
Preferably, the dc blocking circuit further comprises a dc blocking capacitor, which is disposed between the primary coil of the isolation driving transformer and the first electronic switch, and is configured to perform dc-ac conversion on the modulation signal, and provide the converted ac modulation signal to the isolation driving transformer.
Preferably, the high-frequency signal generating unit includes a self-oscillation circuit and a first current limiting resistor; the first current limiting resistor is arranged between the signal output end of the self-oscillation circuit and the pulse signal generating unit;
and a fundamental wave signal output by the self-oscillation circuit is transmitted to the pulse signal generating unit through the first current limiting resistor.
Preferably, the self-oscillation circuit comprises a constant voltage source, a second current-limiting resistor, a divider resistor, a second electronic switch, a first capacitor and a second control circuit, wherein the resistance value of the second current-limiting resistor is greater than that of the divider resistor;
the first end of the second electronic switch is connected with the second current-limiting resistor and then connected with the anode of the constant voltage source, the second end of the second electronic switch is connected with the voltage-dividing resistor and then connected with the cathode of the constant voltage source, and the third end of the second electronic switch is connected with the output end of the second control circuit; one end of the first capacitor is connected with the first end of the second electronic switch, and the other end of the first capacitor is connected with the second end of the second electronic switch after being connected with the voltage-dividing resistor;
the second control circuit is used for generating a second PWM pulse signal so as to control the on or off of the second electronic switch;
when the second PWM pulse signal output by the second control circuit is at a high level, the second electronic switch is in a conducting state, and outputs a fundamental wave signal at a low level;
when the second PWM pulse signal output by the second control circuit is at a low level, the second electronic switch is in a cut-off state, and outputs a fundamental wave signal at a high level.
Preferably, the demodulation module comprises a rectification module and a drive holding circuit;
the rectification module is connected with a secondary coil of the isolation driving transformer and is used for converting an alternating current modulation signal transmitted by the isolation driving transformer into a direct current modulation signal;
the drive holding circuit is used for converting the direct-current modulation signal output by the rectifying module into an inverted signal equal to the switching frequency of the first PWM pulse signal.
Preferably, the rectifier module includes a first diode and a second diode connected in series, and a third diode and a fourth diode connected in series, and the third diode and the fourth diode are connected in series and then are connected in parallel with the first diode and the second diode;
the anode of the first diode and the cathode of the second diode are connected with the homonymous end of the secondary winding of the isolation driving transformer, and the anode of the third rectifier diode and the cathode of the fourth rectifier diode are connected with the heteronymous end of the secondary winding of the isolation driving transformer; and cathodes of the first diode and the third diode are used as a first output end of the rectifying module, and anodes of the second diode and the fourth diode are used as a second output end of the rectifying module and are connected with the drive holding circuit.
Preferably, the drive holding circuit includes a second resistor, a third resistor, and a second capacitor;
the third resistor is connected in parallel with the second capacitor, one end of the second capacitor is connected with the cathodes of the first diode and the third diode through the second resistor, and the other end of the second capacitor is connected with the anodes of the second diode and the fourth diode.
Preferably, the frequency of the fundamental wave signal generated by the high-frequency signal generating unit is more than 1MHZ, and the voltage is more than 2 times of the voltage of the first PWM pulse signal.
Preferably, the first electronic switch is selected from any one of a bipolar transistor, a field effect transistor, and an IGBT.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) according to the modulation type transformer isolation driving circuit independent of the switching frequency, the high-frequency signal sent by the high-frequency signal generating unit is adopted for magnetic resetting of the transformer, compared with the method for magnetic resetting by utilizing the input PWM pulse signal, the problem of magnetic saturation of the transformer under the condition of high duty ratio is avoided, and therefore the duty ratio change range of the transformer isolation driving circuit is greatly enlarged.
(2) The modulation type transformer isolation driving circuit independent of the switching frequency provided by the invention can be suitable for occasions with lower switching frequency of output pulse signals, and the volume of the transformer and the volume of the blocking capacitor are reduced.
Drawings
Fig. 1 is a block diagram of a modulation-type transformer isolation driving circuit independent of a switching frequency according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a modulation-type transformer isolation driving circuit independent of a switching frequency according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a self-oscillation circuit provided by an embodiment of the present invention;
FIG. 4 is a waveform diagram of a fundamental wave signal generated by the high-frequency signal generating unit;
fig. 5 is a waveform diagram of the modulated signal output by the secondary coil of the isolation driving transformer and the PWM output signal demodulated by the demodulation module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a block diagram of a modulation type isolation driving circuit independent of a switching frequency provided in the present embodiment, and referring to fig. 1, the modulation type isolation driving circuit includes an isolation driving transformer T1, a modulation module connected to a primary winding of an isolation driving transformer T1, and a demodulation module connected to a secondary winding of an isolation driving transformer T1; wherein, the modulation module includes:
a high-frequency signal generating unit for generating a fundamental wave signal having one of the roles of magnetically resetting the isolation drive transformer;
the pulse signal generating unit is used for generating a first PWM pulse signal, and the frequency of a fundamental wave signal output by the high-frequency signal generating unit is greater than that of the first PWM pulse signal; the pulse signal generating unit is used for modulating the first PWM pulse signal at a high frequency by using a fundamental wave signal, namely modulating the first PWM pulse signal by using a fundamental wave signal with a frequency higher than that of the first PWM pulse signal, generating a modulation signal with a switching frequency equal to that of the first PWM pulse signal, and transmitting the modulation signal to a primary coil of the isolation driving transformer; in a specific example, the frequency of the fundamental wave signal output by the high-frequency signal generating unit is not lower than 1MHz, and the voltage is more than 2 times of the voltage of the first PWM pulse signal.
The demodulation module is mainly used for converting the modulation signal output by the secondary coil of the isolation driving transformer T1 into an inverted signal of the first PWM pulse signal.
In an alternative embodiment, as shown in fig. 2, it is a schematic circuit structure diagram of a modulation type isolation driving circuit provided in this embodiment; the pulse signal generating unit comprises a first control circuit and a first electronic switch Q1; the first control circuit is used for generating a first PWM pulse signal so as to control the on or off of the first electronic switch Q1; a first end of the first electronic switch Q1 is connected with the output end of the first control circuit to receive the first PWM pulse signal, and a second end and a third end are connected with the output end of the high-frequency signal generating unit and form a series circuit with the primary coil of the isolation driving transformer T1;
when the first PWM pulse signal output by the first control circuit is at a high level, the first electronic switch Q1 is in a conducting state, at this time, the primary coil of the isolation driving transformer T1 is short-circuited, and the secondary coil outputs a low-level modulation signal;
when the first PWM pulse signal output from the first control circuit is at a low level, the first electronic switch Q1 is turned off, the fundamental wave signal generated by the high frequency signal generating unit is transmitted to the primary winding of the isolated drive transformer T1, and the secondary winding outputs a high level modulation signal.
As a preferred example of this embodiment, the modulation type isolation driving circuit further includes a dc blocking capacitor C1, and the dc blocking capacitor C1 is disposed between the primary coil of the isolation driving transformer T1 and the first electronic switch Q1, and is mainly used for dc-ac converting the modulation signal and providing the converted ac modulation signal to the isolation driving transformer.
As a specific example of the present embodiment, the high-frequency signal generating unit includes a self-oscillation circuit and a first current limiting resistor R1; the first current limiting resistor R1 is arranged between the signal output end of the self-oscillation circuit and the pulse signal generating unit; the fundamental wave signal output by the self-oscillation circuit is transmitted to the pulse signal generating unit through the first current limiting resistor R1.
Fig. 3 is a schematic structural diagram of a self-oscillation circuit provided in this embodiment, referring to fig. 3, the self-oscillation circuit includes a constant voltage source Vin, a second control circuit, a second electronic switch Q2, a second current-limiting resistor R4, a voltage-dividing resistor R5, and a capacitor C3, and a resistance value of the second current-limiting resistor R4 is greater than that of the voltage-dividing resistor R5; the resistance values of the second current-limiting resistor R4 and the voltage-dividing resistor R5 are not specifically limited in this embodiment, as long as the resistance value of the second current-limiting resistor R4 is far greater than that of the voltage-dividing resistor R5; preferably, the ratio of the resistance of the second current limiting resistor R4 to the resistance of the voltage dividing resistor R5 is greater than 1000.
The first end of the second electronic switch Q2 is connected with the anode of the constant voltage source Vin after being connected with the second current limiting resistor R2, the second end of the second electronic switch Q2 is connected with the cathode of the constant voltage source Vin after being connected with the voltage dividing resistor R5, and the third end of the second electronic switch Q2 is connected with the output end of the second control circuit; one end of the capacitor C3 is connected with a first end of the second electronic switch Q2, and the other end is connected with the voltage-dividing resistor R5 and then connected with a second end of the second electronic switch Q2;
the second control circuit is used for generating a second PWM pulse signal so as to control the on or off of the second electronic switch;
when the second PWM pulse signal output from the second control circuit is at a high level, the second electronic switch Q2 is in a conducting state, thereby outputting a fundamental wave signal at a low level;
when the second PWM pulse signal output from the second control circuit is at a low level, the second electronic switch Q2 is in an off state, thereby outputting a fundamental wave signal at a high level.
Specifically, when the second PWM pulse signal sent by the second control circuit is at a high level, the second electronic switch Q2 is turned on, the voltage dividing resistor R5 is small relative to the current limiting resistor R4, and the second PWM pulse signal output by the self-oscillation circuit is almost 0, which is equivalent to outputting a second PWM pulse signal at a low level (i.e., a fundamental wave signal); when the second control circuit sends out the second PWM pulse signal as low level, the second electronic switch Q2 is turned off, and the self-oscillation circuit outputs the second PWM pulse signal as high level.
In an alternative embodiment, the demodulation module comprises a rectification module and a drive holding circuit:
the rectification module is connected with a secondary coil of the isolation driving transformer T1 and is used for converting an alternating current modulation signal transmitted by the isolation driving transformer T1 into a direct current modulation signal; the drive holding circuit is used for converting the direct-current modulation signal output by the rectifying module into an inverted signal with the same switching frequency as the first PWM pulse signal.
Specifically, as shown in fig. 2, the rectifying module includes a first diode D1 and a second diode D2 connected in series, and a third diode D3 and a fourth diode D4 connected in series, and the third diode D3 and the fourth diode D4 are connected in series and then connected in parallel with the first diode D1 and the second diode D2. The anode D1 of the first diode and the cathode of the second diode D2 are connected with the dotted terminal of the secondary winding of the isolation driving transformer T1, and the anode of the third rectifier diode D3 and the cathode of the fourth rectifier diode D4 are connected with the dotted terminal of the secondary winding of the isolation driving transformer T1; cathodes of the first diode D1 and the third diode D3 are connected to the drive holding circuit as a first output terminal of the rectifying module, and anodes of the second diode D2 and the fourth diode D4 are connected to the drive holding circuit as a second output terminal of the rectifying module.
The drive holding circuit comprises a resistor R2, a resistor R3 and a filter capacitor C2; the resistor R3 is connected in parallel with the filter capacitor C2, one end of the filter capacitor C2 is connected with the cathodes of the first diode D1 and the third diode D3 through the resistor R2, and the other end of the filter capacitor C2 is connected with the anodes of the second diode D2 and the fourth diode D4.
In the above embodiments, the first electronic switch Q1 and the second electronic switch Q2 are selected from any one of a bipolar transistor, a field effect transistor, and an IGBT.
The following describes a specific operation principle of the modulation transformer isolation driving circuit independent of the switching frequency according to this embodiment as follows:
in the modulation type isolation driving circuit provided in this embodiment, the first electronic switch Q1 is controlled to be turned on and off by the first PWM pulse signal input to the isolation driving circuit by the pulse signal generating unit, the high frequency signal provided by the high frequency signal generating unit participates in the modulation of the first PWM pulse signal as a fundamental wave, the first PWM pulse signal is modulated into a modulated signal having the same switching frequency and then is successfully transmitted through the isolation driving transformer, a secondary winding signal is formed, and the modulated signal is restored to an inverted signal of the first PWM pulse signal input by the pulse signal generating unit by the demodulating circuit.
When the pulse signal generating unit outputs a high level, the first electronic switch Q1 is turned on, the primary winding of the isolation driving transformer T1 and the dc blocking capacitor C1 are short-circuited, the high-frequency fundamental wave signal emitted by the high-frequency signal generating unit forms a loop with the first current limiting resistor R1, and since most of the energy is consumed by the first current resistor R1, the primary winding of the isolation driving transformer T1 hardly transfers energy, so that the pulse signal output from the secondary winding of the isolation driving transformer T1 is at a low level.
When the pulse signal generating unit outputs a low level, the first electronic switch Q1 is turned off, a high-frequency fundamental wave signal sent by the high-frequency signal generating unit forms a loop with the first current-limiting resistor R1, the blocking capacitor C1 and the primary winding of the isolation driving transformer T1, the high-frequency signal sent by the high-frequency signal generating unit passes through the first resistor R1 and then the blocking capacitor C1 to change a direct-current voltage signal into an alternating-current voltage signal, the signal is transmitted to the secondary winding of the isolation driving transformer T1 through the primary winding of the isolation driving transformer T1, and finally the high-level pulse signal is output through the rectifying module and the driving holding circuit.
After passing through the demodulation circuit, the PWM pulse signal transmitted from the secondary winding of the isolation drive transformer is reduced to an inverted signal having the same switching frequency as the original input PWM pulse signal.
In this embodiment, after the first PWM pulse signal is modulated by the high-frequency fundamental wave signal generated by the high-frequency signal generating unit, the modulation signal output from the secondary coil of the isolation driving transformer and the first PWM pulse signal have the completely same switching frequency, that is, the switching frequency has no loss; and because the magnetic reset of the isolation driving transformer is completed by the high-frequency fundamental wave signal, the magnetic reset is only related to the frequency of the high-frequency fundamental wave signal and is not related to the switching frequency of the first PWM pulse signal, so the volume of the whole system cannot be increased due to the reduction of the frequency of the first PWM pulse signal.
Simulation verification is performed on the modulation and demodulation module of the modulation type isolation driving circuit through simulation software, and as a result, as shown in fig. 4 to 5, the pulse signal generation unit initially outputs a square wave direct current signal with a forward amplitude of 5V, the high-frequency signal generation unit outputs a square wave direct current signal with a forward amplitude of 30V (fig. 4), the square wave direct current signal is subjected to direct current-alternating current conversion through the signal modulation and the dc blocking capacitor C1 and then transmitted to the isolation driving transformer T1, as shown in fig. 5, the secondary coil of the isolation driving transformer T1 outputs a square wave alternating current signal which is consistent with the switching frequency of the pulse signal generation unit and has a positive and negative amplitude of about 20V, and after passing through the demodulation circuit, the square wave direct current signal with a forward amplitude of about 15V is finally output. It can be seen that both the modulation circuit and the demodulation circuit can work normally, after the high-frequency signal passes through the modulation circuit and the demodulation circuit, the forward amplitude of the high-frequency signal becomes half of the initial forward amplitude (wherein, partial loss exists), the frequency of the finally output PWM pulse signal is the same as that of the initially input PWM pulse signal, and the duty ratio is complementary.
According to the idea of modulating and demodulating transmission signals, the high-frequency fundamental wave signal generated by the high-frequency signal generating unit is utilized for magnetic reset, so that the switching frequency of the input PWM pulse signal does not participate in the magnetic reset and only plays a role in signal transmission, the problem of magnetic saturation of the transformer under the condition of high duty ratio is avoided, and the duty ratio change range of the transformer isolation driving circuit is greatly enlarged. Meanwhile, the magnetic reset is realized through a high-frequency signal, so that the volumes of the isolation driving transformer and the blocking capacitor can be greatly reduced, and the magnetic reset circuit has the advantages of few circuit components, simplicity, practicability and convenience in popularization and application.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A modulation type isolation driving circuit independent of switching frequency is characterized by comprising an isolation driving transformer, a modulation module connected with a primary coil of the isolation driving transformer and a demodulation module connected with a secondary coil of the isolation driving transformer; wherein the modulation module comprises:
the high-frequency signal generating unit is used for generating a fundamental wave signal and carrying out magnetic reset on the isolation driving transformer;
a pulse signal generating unit including a first control circuit and a first electronic switch;
the first control circuit is used for generating a first PWM pulse signal so as to control the on or off of the first electronic switch; the frequency of the fundamental wave signal is greater than the switching frequency of the first PWM pulse signal; the first end of the first electronic switch is connected with the output end of the first control circuit to receive the first PWM pulse signal, and the second end and the third end of the first electronic switch are connected with the output end of the high-frequency signal generating unit and form a series loop with a primary coil of the isolation driving transformer;
when the first electronic switch is in a conducting state, the primary coil of the isolation driving transformer is short-circuited, and the secondary coil outputs a low-level modulation signal;
when the first electronic switch is in a cut-off state, a fundamental wave signal generated by a high-frequency signal generating unit is transmitted to a primary coil of the isolation driving transformer, and a secondary coil outputs a high-level modulation signal;
the switching frequency of the modulation signal output by the secondary coil is equal to the first PWM pulse signal;
the demodulation module is used for converting the modulation signal output by the secondary coil of the isolation driving transformer into an inverted signal of the first PWM pulse signal.
2. The modulation-type isolation drive circuit according to claim 1,
when the first PWM pulse signal output by the first control circuit is at a high level, the first electronic switch is in a conducting state;
when the first PWM pulse signal output by the first control circuit is in a low level, the first electronic switch is in a cut-off state.
3. The modulation-type isolation driving circuit according to claim 2, further comprising a dc blocking capacitor provided between the primary winding of the isolation driving transformer and the first electronic switch, for dc-ac converting a modulation signal and supplying the converted ac modulation signal to the isolation driving transformer.
4. The modulation type isolation drive circuit according to claim 1 or 3, wherein the high-frequency signal generating unit includes a self-oscillation circuit and a first current limiting resistor; the first current limiting resistor is arranged between the signal output end of the self-oscillation circuit and the pulse signal generating unit;
and a fundamental wave signal output by the self-oscillation circuit is transmitted to the pulse signal generating unit through the first current limiting resistor.
5. The modulation type isolation driving circuit according to claim 4, wherein the self-oscillation circuit includes a constant voltage source, a second current limiting resistor, a voltage dividing resistor, a second electronic switch, a first capacitor, and a second control circuit, and a resistance value of the second current limiting resistor is larger than that of the voltage dividing resistor;
the first end of the second electronic switch is connected with the second current-limiting resistor and then connected with the anode of the constant voltage source, the second end of the second electronic switch is connected with the voltage-dividing resistor and then connected with the cathode of the constant voltage source, and the third end of the second electronic switch is connected with the output end of the second control circuit; one end of the first capacitor is connected with the first end of the second electronic switch, and the other end of the first capacitor is connected with the second end of the second electronic switch after being connected with the voltage-dividing resistor;
the second control circuit is used for generating a second PWM pulse signal so as to control the on or off of the second electronic switch;
when the second PWM pulse signal output by the second control circuit is at a high level, the second electronic switch is in a conducting state, and outputs a fundamental wave signal at a low level;
when the second PWM pulse signal output by the second control circuit is at a low level, the second electronic switch is in a cut-off state, and outputs a fundamental wave signal at a high level.
6. The modulation-type isolation driving circuit according to claim 1 or 5, wherein the demodulation block includes a rectification block and a drive holding circuit;
the rectification module is connected with a secondary coil of the isolation driving transformer and is used for converting an alternating current modulation signal transmitted by the isolation driving transformer into a direct current modulation signal;
the drive holding circuit is used for converting the direct current modulation signal output by the rectifying module into a signal with the sum of duty ratios equal to the switching frequency of the first PWM pulse signal being 1.
7. The modulation type isolation driving circuit according to claim 6, wherein the rectifying module comprises a first diode and a second diode connected in series, and a third diode and a fourth diode connected in series, and the third diode and the fourth diode are connected in series and then arranged in parallel with the first diode and the second diode;
the anode of the first diode and the cathode of the second diode are connected with the homonymous end of the secondary winding of the isolation driving transformer, and the anode of the third diode and the cathode of the fourth diode are connected with the heteronymous end of the secondary winding of the isolation driving transformer; and cathodes of the first diode and the third diode are used as a first output end of the rectifying module, and anodes of the second diode and the fourth diode are used as a second output end of the rectifying module and are connected with the drive holding circuit.
8. The modulation-type isolation drive circuit according to claim 7, wherein the drive holding circuit includes a second resistor, a third resistor, and a second capacitor;
the third resistor is connected in parallel with the second capacitor, one end of the second capacitor is connected with the cathodes of the first diode and the third diode through the second resistor, and the other end of the second capacitor is connected with the anodes of the second diode and the fourth diode.
9. The modulation-type isolation driving circuit according to claim 1, wherein a frequency of a fundamental wave signal generated by the high-frequency signal generating unit is 1MHz or more, and a voltage is 2 times or more a voltage of the first PWM pulse signal.
10. The modulation type isolation drive circuit according to claim 1, wherein the first electronic switch is selected from any one of a bipolar transistor, a field effect transistor, and an IGBT.
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| US20180323713A1 (en) * | 2017-04-18 | 2018-11-08 | EMD Technologies Incorporated | Soft-switching for high-frequency power conversion |
| CN207339303U (en) * | 2017-06-02 | 2018-05-08 | 广东万城万充电动车运营股份有限公司 | High power DC charger |
| CN111800144A (en) * | 2020-07-14 | 2020-10-20 | 苏州锴威特半导体股份有限公司 | Isolation transmission circuit based on-chip transformer |
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