CN211930498U - Starting circuit, series resonance conversion device and switching power supply - Google Patents
Starting circuit, series resonance conversion device and switching power supply Download PDFInfo
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- CN211930498U CN211930498U CN202020140406.0U CN202020140406U CN211930498U CN 211930498 U CN211930498 U CN 211930498U CN 202020140406 U CN202020140406 U CN 202020140406U CN 211930498 U CN211930498 U CN 211930498U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model relates to a starting circuit, series resonance converting device and switching power supply, the starting circuit includes a controller and a bus capacitor ripple detecting unit, a temperature detecting unit and an output voltage feedback adjusting unit which are all connected with the controller, the temperature detecting unit is used for sending temperature detecting signals to the controller, the controller is used for setting the corresponding control mode as a pulse width modulation mode when the temperature detecting signals judge that the environmental temperature is less than the preset temperature threshold value, the output voltage feedback adjusting unit is used for generating feedback adjusting signals and sending the feedback adjusting signals to the controller, the controller is also used for adjusting the duty ratio of the pulse width modulation signals according to the feedback adjusting signals, the bus capacitor ripple detecting unit is used for generating ripple voltage detecting signals and sending the ripple voltage detecting signals to the controller, the controller is also used for adjusting the corresponding control mode to a frequency modulation mode when the bus capacitor ripple voltage is judged to be less than the preset voltage threshold value, the starting circuit improves the low-temperature working characteristic of the series resonant converter.
Description
Technical Field
The utility model relates to a circuit field especially relates to a starting circuit, series resonance converting means and switching power supply.
Background
In the control process of the current LLC (series resonant converter) circuit, when the Power supply is fully loaded at low temperature and started, the bus capacitor voltage output by the preceding stage PFC (Power Factor Correction) will drop very obviously in the instant when the output is suddenly loaded with full load, the ambient temperature is lower, the bus capacitor voltage is increased with the amplitude of the output suddenly loaded with full load, and the subsequent stage LLC circuit converter is abnormally shut down, enters a repeated restart state, and even may damage the Power supply when the protection setting is unreasonable.
Therefore, it is a common practice to increase the capacitance of the preceding-stage high-voltage dc bus capacitor to reduce the drop amplitude of the bus voltage at the starting moment, or to reduce the drop amplitude of the bus voltage at the starting moment by reducing the influence of the low-temperature bus capacitor ESR in a parallel connection manner of multiple bus capacitors, which will increase the product cost and volume accordingly.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a starting circuit, series resonance converter and switching power supply, can be through the controller and all bus capacitor ripple detecting element that is connected with the controller, mutually supporting of temperature detecting element and output voltage feedback regulating element, construct a low temperature start-up process that can carry out real-time switching between pulse modulation mode and frequency modulation mode, still make series resonance converter can punctual start on the basis that does not increase product cost, and do not prolong start-up time, show the low temperature working property who has promoted series resonance converter, the better market range of application who widens the product.
A starting circuit is applied to a series resonant converter and comprises a controller, a bus capacitor ripple detection unit, a temperature detection unit and an output voltage feedback regulation unit, wherein the bus capacitor ripple detection unit, the temperature detection unit and the output voltage feedback regulation unit are all connected with the controller;
the temperature detection unit is used for detecting the ambient temperature and sending a corresponding temperature detection signal to the controller;
the controller is used for judging whether the ambient temperature is smaller than a preset temperature threshold value or not according to the temperature detection signal, if so, setting the control mode of the series resonant converter to be a pulse width modulation mode, and if not, setting the control mode to be a frequency modulation mode;
the output voltage feedback adjusting unit is used for generating a feedback adjusting signal and sending the feedback adjusting signal to the controller;
the controller is also used for adjusting the duty ratio of the pulse width modulation signal according to the feedback adjusting signal;
the bus capacitor ripple detection unit is used for detecting the bus capacitor ripple voltage in real time, generating a corresponding ripple voltage detection signal and sending the ripple voltage detection signal to the controller;
the controller is further used for judging whether the ripple voltage of the bus capacitor is smaller than a preset voltage threshold value or not according to the ripple voltage detection signal, if so, the control mode of the series resonant converter is adjusted to be a frequency modulation mode, and if not, the control mode of the series resonant converter is kept to be a pulse width modulation mode.
In one embodiment, the output voltage feedback regulation unit comprises an output voltage feedback acquisition module, a voltage feedback reference regulation module and a voltage feedback comparison module which are respectively connected with the controller, wherein the output voltage feedback acquisition module is connected with the voltage feedback comparison module;
the output voltage feedback acquisition module is used for generating an output voltage feedback sampling signal and sending the output voltage feedback sampling signal to the voltage feedback comparison module;
the voltage feedback reference adjusting module is used for receiving the control signal sent by the controller, generating a voltage feedback reference signal according to the control signal and sending the voltage feedback reference signal to the voltage feedback comparison module;
and the voltage feedback comparison module is used for generating a feedback regulation signal according to the output voltage feedback sampling signal and the voltage feedback reference signal and sending the feedback regulation signal to the controller.
In one embodiment, the voltage feedback reference adjusting module comprises a first optical coupling switch, a series voltage stabilizing reference device and a reference filter which are connected in sequence, wherein a positive input end of the first optical coupling switch is connected with the controller through a bias resistor, a negative input end of the first optical coupling switch is grounded, and an output end of the reference filter is connected with the voltage feedback comparison module.
In one embodiment, the series voltage-stabilizing reference device comprises a reference resistor, a reference capacitor and a voltage-stabilizing tube, wherein one end of the voltage-stabilizing tube connected with the reference capacitor in parallel is respectively connected with one end of the reference resistor and the positive output end of the first optical coupling switch, the other end of the voltage-stabilizing tube connected with the reference capacitor in parallel is connected with the negative output end of the first optical coupling switch, and the other end of the reference resistor is externally connected with a reference voltage.
In one embodiment, the reference filter employs an RC filter circuit.
In one embodiment, the voltage feedback comparison module comprises a second optical coupler switch, a pull-up resistor and a feedback comparator, wherein an anode output end of the second optical coupler switch is connected with the controller, a cathode output end of the second optical coupler switch is grounded, an anode input end of the second optical coupler switch is connected with a reference voltage through the pull-up resistor, a cathode input end of the second optical coupler switch is connected with an output end of the feedback comparator, an anode input end of the feedback comparator is connected with the voltage feedback reference regulation module, and a cathode input end of the feedback comparator is connected with the output voltage feedback collection module.
In one embodiment, the output voltage feedback acquisition module comprises a first voltage division sampling resistor and a second voltage division sampling resistor, one end of the first voltage division sampling resistor is externally connected with a positive end of the output voltage, the other end of the first voltage division sampling resistor is connected with one end of the second voltage division sampling resistor, and the other end of the second voltage division sampling resistor is externally connected with a negative end of the output voltage.
In one embodiment, the bus capacitor ripple detection unit comprises a differential proportional sampling unit and an alternating current capacitor, wherein an input end of the differential proportional sampling unit is used for externally connecting the bus capacitor, an output end of the differential proportional sampling unit is connected with one end of the alternating current capacitor, and the other end of the alternating current capacitor is connected with the controller.
In one embodiment, the temperature detection unit comprises a first voltage-dividing resistor, a thermistor, a second voltage-dividing resistor, a voltage comparator and a diode, wherein the first voltage-dividing resistor and the thermistor are connected in series, a non-inverting input end of the voltage comparator is connected with the second voltage-dividing resistor, a common end of the first voltage-dividing resistor and the thermistor is connected with an inverting input end of the voltage comparator, an output end of the voltage comparator is connected with a positive end of the diode, and a negative end of the diode is connected with the controller.
In addition, a series resonance conversion device is also provided, and the series resonance converter adopts the starting circuit.
In addition, still provide a switching power supply, switching power supply adopts above-mentioned series resonance to become the device.
The starting circuit comprises a controller, a bus capacitor ripple detecting unit, a temperature detecting unit and an output voltage feedback adjusting unit, wherein the bus capacitor ripple detecting unit, the temperature detecting unit and the output voltage feedback adjusting unit are all connected with the controller, the controller is also used for being connected with a series resonant converter through a driving switch, the temperature detecting unit is used for detecting the ambient temperature and sending a corresponding temperature detection signal to the controller, the controller is used for judging whether the ambient temperature is smaller than a preset temperature threshold value according to the temperature detection signal, if so, the control mode of the series resonant converter is set to be a pulse width modulation mode, if not, the control mode is set to be a frequency modulation mode, the output voltage feedback adjusting unit is used for generating a feedback adjusting signal and sending the feedback adjusting signal to the controller, the controller is also used for adjusting the duty ratio of the pulse width modulation signal according to the feedback adjusting signal, generating a corresponding ripple voltage detection signal and sending the ripple voltage detection signal to a controller, wherein the controller is also used for judging whether the ripple voltage of the bus capacitor is smaller than a preset voltage threshold value according to the ripple voltage detection signal, if so, adjusting the control mode of the series resonant converter to be a frequency modulation mode, if not, keeping the control mode of the series resonant converter to be a pulse width modulation mode, and constructing a low-temperature starting process capable of switching between the pulse modulation mode and the frequency modulation mode in real time through the mutual cooperation of the controller and a bus capacitor ripple detection unit, a temperature detection unit and an output voltage feedback adjustment unit which are all connected with the controller, so that the series resonant converter can be started on time on the basis of not increasing the product cost, the starting time is not prolonged, and the low-temperature working characteristic of the series resonant converter is remarkably improved, the market application range of the product is better widened.
Drawings
In order to illustrate the technical solution of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 is a schematic structural diagram of a start-up circuit provided in an embodiment;
FIG. 2 is a block diagram of a startup circuit provided in one embodiment;
fig. 3 is a schematic structural diagram of a series resonant conversion device provided in an embodiment;
fig. 4 is a schematic structural diagram of a switching power supply provided in an embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Various embodiments of the present disclosure will be described more fully hereinafter. The present disclosure is capable of various embodiments and of modifications and variations therein. However, it should be understood that: there is no intention to limit the various embodiments of the disclosure to the specific embodiments disclosed herein, but rather, the disclosure is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the disclosure.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Fig. 1 is a block diagram of a start-up circuit 100 of a series resonant converter 160 provided in an embodiment, where the start-up circuit 100 includes a controller 110, and a bus capacitor ripple detection unit 120, a temperature detection unit 130, and an output voltage feedback regulation unit 140 all connected to the controller 110, and the controller 110 is further configured to be connected to the series resonant converter 160 through a driving switch 150.
The input terminal of the series resonant converter 160 is further connected to a BUS capacitor C in a preceding PFC (power factor correction unit), BUS + is the positive input terminal of the series resonant converter 160, and BUS-is the negative input terminal of the series resonant converter 160.
The temperature detection unit 130 is configured to detect an ambient temperature and send a corresponding temperature detection signal to the controller 110;
the controller 110 is configured to determine whether the ambient temperature is less than a preset temperature threshold according to the temperature detection signal, set the control mode of the series resonant converter 160 to the pulse width modulation mode if the ambient temperature is less than the preset temperature threshold, and set the control mode to the frequency modulation mode if the ambient temperature is not less than the preset temperature threshold;
the output voltage feedback adjusting unit 140 is configured to generate a feedback adjusting signal and send the feedback adjusting signal to the controller 110;
the controller 110 is further configured to adjust a duty cycle of the pulse width modulated signal according to the feedback adjustment signal;
the bus capacitor ripple detection unit 120 is configured to detect a bus capacitor ripple voltage in real time, generate a corresponding ripple voltage detection signal, and send the ripple voltage detection signal to the controller 110;
the controller 110 is further configured to determine whether the ripple voltage of the bus capacitor is smaller than a preset voltage threshold according to the ripple voltage detection signal, adjust the control mode of the series resonant converter 160 to the frequency modulation mode if the ripple voltage is smaller than the preset voltage threshold, and maintain the control mode of the series resonant converter 160 to be the pulse width modulation mode if the ripple voltage is not smaller than the preset voltage threshold.
The starting circuit 100 of the series resonant converter 160 can construct a low-temperature starting process capable of switching between a pulse modulation mode and a frequency modulation mode in real time through the mutual cooperation of the controller 110, the bus capacitor ripple detection unit 120, the temperature detection unit 130 and the output voltage feedback adjustment unit 140 which are all connected with the controller 110, so that the series resonant converter 160 can still start on time on the basis of not increasing the product cost, the starting time is not prolonged, the low-temperature working characteristic of the series resonant converter 160 is remarkably improved, and the market application range of products is better expanded.
In one embodiment, as shown in fig. 2, the output voltage feedback adjusting unit 140 includes an output voltage feedback collecting module 142, a voltage feedback reference adjusting module 144 and a voltage feedback comparing module 146 respectively connected to the controller 110, wherein the output voltage feedback collecting module 142 is connected to the voltage feedback comparing module 146;
the output voltage feedback acquisition module 142 is configured to generate an output voltage feedback sampling signal and send the output voltage feedback sampling signal to the voltage feedback comparison module 146;
the voltage feedback reference adjusting module 144 is configured to receive the control signal sent by the controller 110, generate a voltage feedback reference signal according to the control signal, and send the voltage feedback reference signal to the voltage feedback comparing module 146;
the voltage feedback comparison module 146 is configured to generate a feedback adjustment signal according to the output voltage feedback sampling signal and the voltage feedback reference signal, and send the feedback adjustment signal to the controller 110.
In one embodiment, the controller is a digital DSP controller.
In one embodiment, as shown in fig. 2, the voltage feedback reference adjusting module 144 includes a first optical coupling switch P1, a series regulator reference 144a and a reference filter 144b connected in sequence, wherein a positive input terminal of the first optical coupling switch P1 passes through a bias resistor RaThe output end of the reference filter 144b is connected to the voltage feedback comparison module 146, and the negative input end of the first optocoupler switch P1 is connected to the ground.
In one embodiment, as shown in fig. 2, the series voltage-stabilizing reference device 144a includes a reference resistor R0, a reference capacitor C0, and a voltage-stabilizing tube ZD1, one end of the voltage-stabilizing tube ZD1 after being connected in parallel with the reference capacitor C0 is respectively connected with one end of the reference resistor R0 and the positive output end of the first opto-coupler switch P1, the other end of the voltage-stabilizing tube ZD1 after being connected in parallel with the reference capacitor C0 is connected with the negative output end of the first opto-coupler switch P1, and the other end of the reference resistor R0 is externally connected with a reference voltage SVCC provided by an auxiliary power supply.
In one embodiment, as shown in fig. 2, the voltage feedback comparison module 146 includes a second optical coupler switch P2, a pull-up resistor R1 and a feedback comparator 146a, a positive output terminal of the second optical coupler switch P2 is connected to the controller 110, a negative output terminal of the second optical coupler switch P2 is grounded, a positive input terminal of the second optical coupler switch P2 is connected to the reference voltage through the pull-up resistor R1, a negative input terminal of the second optical coupler switch P2 is connected to an output terminal of the feedback comparator 146a, a positive input terminal of the feedback comparator 146a is connected to the voltage feedback reference adjustment module 144, and a negative input terminal of the feedback comparator 146a is connected to the output voltage feedback collection module 142.
In one embodiment, as shown in fig. 2, the output voltage feedback collecting module 142 includes a first voltage-dividing sampling resistor R2 and a second voltage-dividing sampling resistor R3, one end of the first voltage-dividing sampling resistor R2 is externally connected to a positive terminal of the output voltage, the other end of the first voltage-dividing sampling resistor R2 is connected to one end of the second voltage-dividing sampling resistor R3, and the other end of the second voltage-dividing sampling resistor R3 is externally connected to a negative terminal of the output voltage.
In one embodiment, as shown in fig. 2, the bus capacitor ripple detection unit 120 includes a differential proportional sampling unit 122 and an ac capacitor C1, an input terminal of the differential proportional sampling unit 122 is used for externally connecting the bus capacitor, an output terminal of the differential proportional sampling unit 122 is connected to one end of the ac capacitor C1, and the other end of the ac capacitor C1 is connected to the controller 110.
In one embodiment, as shown in fig. 2, the temperature detecting unit 130 includes a first voltage-dividing resistor R4, a thermistor R5, a second voltage-dividing resistor R6, a voltage comparator 132, and a diode D1, the first voltage-dividing resistor R4 and the thermistor R5 are connected in series, a non-inverting input terminal of the voltage comparator 132 is connected to the second voltage-dividing resistor R6, a common terminal of the first voltage-dividing resistor R4 and the thermistor R5 is connected to an inverting input terminal of the voltage comparator 132, an output terminal of the voltage comparator 132 is connected to a positive terminal of the diode D1, and a negative terminal of the diode D1 is connected to the controller 110, wherein the other terminal of the first voltage-dividing resistor R4 is externally connected to the reference power supply PVCC.
In one embodiment, as shown in fig. 2, the differential proportional sampling unit 122 is composed of an inverting input resistor R11, a non-inverting input resistor R10, a non-inverting ground resistor R9, and a voltage comparator 122 a.
In one embodiment, as shown in FIG. 2, the non-inverting input of the voltage comparator 132 is connected to ground through a resistor R7.
In one embodiment, as shown in FIG. 2, reference filter 144b employs an RC filter circuit including resistor RbAnd a capacitor Ca。
In one embodiment, the controller is a DSP controller, and as shown in fig. 2, the operation of the start-up circuit 100 is as follows:
the PVCC and the SVCC are stable working reference voltages provided by the auxiliary power supply, after the whole system is powered on, the auxiliary power supply of the whole power supply system normally outputs the stable PVCC and SVCC voltages to each circuit unit, the controller 110 starts initialization work and starts to detect each peripheral interface, when the input voltage is detected to be within a normal input range, the bus capacitor voltage is stabilized within a predetermined range, whether a set low-temperature starting point is reached is judged through the temperature detection unit 130, and if yes, a low-temperature starting process is started.
When entering the low-temperature start, the controller 110 first initializes the output voltage feedback adjustment unit 140, and passes through the resistor RaOutputting a high level to drive the first optical coupler switch P1, then switching on the output end of the first optical coupler switch P1 and keeping the output end at a low level, then controlling the switching control mode inside the controller 110 to be a PWM pulse width modulation mode, and starting to output a pulse width modulation signal to the drive switch 150, and then the controller 110 turns off the resistor RaWhen a high-level driving signal is generated, the output end of the first optocoupler switch P1 is turned off, at this time, the voltage across the reference capacitor C0 starts from an initial zero value, and rises according to an RC time constant, at this time, R0, C0, and ZD1 form a series voltage regulator reference 144a, so that the voltage across ZD1 in the series voltage regulator reference 144a flexibly rises, and finally, the regulated voltage across ZD1 is regulated as the voltage feedback reference regulation voltage of the voltage feedback comparison module 146, during the rise of the voltage across the ZD1, the second optocoupler switch P2 is in a conducting state, the corresponding conducting current gradually decreases from large, at this time, the controller 110 adjusts the duty ratio from small to large according to the change condition of the conducting current of the second optocoupler switch P2 (which is equivalent to the step of flexibly rising according to the voltage across the reference capacitor C0) until the voltage across the reference capacitor C0 reaches a normal steady-state value, the output voltage of the series resonant converter 160 flexibly rises to the normal output voltage, and at this time, the bus capacitor ripple detection unit 1And 20, continuously sampling and outputting the alternating current ripple voltage signal to the controller 110 for analysis and judgment, and if the ripple voltage of the corresponding bus capacitor is smaller than a preset voltage threshold, adjusting the control mode of the series resonant converter 160 to a frequency modulation mode, so as to complete the low-temperature starting process.
Further, as shown in fig. 3, there is also provided a series resonant converter 200 including the above-described starting circuit 100 and the series resonant converter 160.
In addition, as shown in fig. 4, a switching power supply 300 is provided, where the series resonance conversion apparatus 200 is adopted as the switching power supply 300, the series resonance conversion apparatus 200 is connected with the PFC power factor correction unit 170, and the PFC power factor correction unit 170 is used for connecting an ac power supply.
In addition, each functional module or unit in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention.
Claims (11)
1. A starting circuit is characterized by being applied to a series resonant converter and comprising a controller, a bus capacitor ripple detection unit, a temperature detection unit and an output voltage feedback regulation unit, wherein the bus capacitor ripple detection unit, the temperature detection unit and the output voltage feedback regulation unit are all connected with the controller;
the temperature detection unit is used for detecting the ambient temperature and sending a corresponding temperature detection signal to the controller;
the controller is used for judging whether the environment temperature is smaller than a preset temperature threshold value or not according to the temperature detection signal, if so, setting the control mode of the series resonant converter to be a pulse width modulation mode, and if not, setting the control mode to be a frequency modulation mode;
the output voltage feedback adjusting unit is used for generating a feedback adjusting signal and sending the feedback adjusting signal to the controller;
the controller is also used for adjusting the duty ratio of the pulse width modulation signal according to the feedback adjusting signal;
the bus capacitor ripple detection unit is used for detecting the bus capacitor ripple voltage in real time, generating a corresponding ripple voltage detection signal and sending the ripple voltage detection signal to the controller;
the controller is further configured to determine whether the ripple voltage of the bus capacitor is smaller than a preset voltage threshold according to the ripple voltage detection signal, adjust the control mode of the series resonant converter to a frequency modulation mode if the ripple voltage is smaller than the preset voltage threshold, and maintain the control mode of the series resonant converter to be the pulse width modulation mode if the ripple voltage is not smaller than the preset voltage threshold.
2. The starting circuit according to claim 1, wherein the output voltage feedback regulating unit comprises an output voltage feedback collecting module, a voltage feedback reference regulating module and a voltage feedback comparing module, which are respectively connected with the controller, and the output voltage feedback collecting module is connected with the voltage feedback comparing module;
the output voltage feedback acquisition module is used for generating an output voltage feedback sampling signal and sending the output voltage feedback sampling signal to the voltage feedback comparison module;
the voltage feedback reference adjusting module is used for receiving a control signal sent by the controller, generating a voltage feedback reference signal according to the control signal and sending the voltage feedback reference signal to the voltage feedback comparison module;
the voltage feedback comparison module is used for generating the feedback regulation signal according to the output voltage feedback sampling signal and the voltage feedback reference signal and sending the feedback regulation signal to the controller.
3. The starting circuit according to claim 2, wherein the voltage feedback reference regulating module comprises a first optical coupling switch, a series voltage-stabilizing reference device and a reference filter, which are connected in sequence, wherein a positive input end of the first optical coupling switch is connected with the controller through a bias resistor, a negative input end of the first optical coupling switch is grounded, and an output end of the reference filter is connected with the voltage feedback comparison module.
4. A starting circuit according to claim 3, wherein the series voltage-stabilizing reference device comprises a reference resistor, a reference capacitor and a voltage-stabilizing tube, one end of the voltage-stabilizing tube connected in parallel with the reference capacitor is respectively connected with one end of the reference resistor and the positive output end of the first optocoupler switch, the other end of the voltage-stabilizing tube connected in parallel with the reference capacitor is connected with the negative output end of the first optocoupler switch, and the other end of the reference resistor is externally connected with a reference voltage.
5. The startup circuit of claim 3, wherein the reference filter is an RC filter circuit.
6. The starting circuit according to claim 3, wherein the voltage feedback comparison module comprises a second optical coupling switch, a pull-up resistor and a feedback comparator, a positive input end of the second optical coupling switch is connected with the controller, a negative output end of the second optical coupling switch is grounded, a positive input end of the second optical coupling switch is connected with a reference voltage through the pull-up resistor, a negative input end of the second optical coupling switch is connected with an output end of the feedback comparator, a positive input end of the feedback comparator is connected with the voltage feedback reference regulation module, and a negative input end of the feedback comparator is connected with the output voltage feedback collection module.
7. The starting circuit according to claim 2, wherein the output voltage feedback collection module comprises a first voltage division sampling resistor and a second voltage division sampling resistor, one end of the first voltage division sampling resistor is externally connected with a positive end of the output voltage, the other end of the first voltage division sampling resistor is connected with one end of the second voltage division sampling resistor, and the other end of the second voltage division sampling resistor is externally connected with a negative end of the output voltage.
8. The starting circuit according to claim 1, wherein the bus capacitor ripple detection unit includes a differential proportional sampling unit and an ac capacitor, an input end of the differential proportional sampling unit is used for externally connecting the bus capacitor, an output end of the differential proportional sampling unit is connected to one end of the ac capacitor, and the other end of the ac capacitor is connected to the controller.
9. The startup circuit according to claim 1, wherein the temperature detection unit includes a first voltage-dividing resistor, a thermistor, a second voltage-dividing resistor, a voltage comparator, and a diode, the first voltage-dividing resistor and the thermistor are connected in series, a non-inverting input terminal of the voltage comparator is connected to the second voltage-dividing resistor, a common terminal of the first voltage-dividing resistor and the thermistor is connected to an inverting input terminal of the voltage comparator, an output terminal of the voltage comparator is connected to a positive terminal of the diode, and a negative terminal of the diode is connected to the controller.
10. A series resonant conversion device, characterized in that it employs a start-up circuit according to any of claims 1-9.
11. A switching power supply characterized by using the series resonant conversion device as set forth in claim 10.
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| CN202020140406.0U CN211930498U (en) | 2020-01-21 | 2020-01-21 | Starting circuit, series resonance conversion device and switching power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953220A (en) * | 2021-02-03 | 2021-06-11 | 电子科技大学 | DC-DC converter with current sensing and control |
| CN113472190A (en) * | 2021-06-11 | 2021-10-01 | 深圳欧陆通电子股份有限公司 | Low-temperature starting method of switching power supply and switching power supply |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953220A (en) * | 2021-02-03 | 2021-06-11 | 电子科技大学 | DC-DC converter with current sensing and control |
| CN112953220B (en) * | 2021-02-03 | 2022-12-30 | 电子科技大学 | DC-DC converter with current sensing and control |
| CN113472190A (en) * | 2021-06-11 | 2021-10-01 | 深圳欧陆通电子股份有限公司 | Low-temperature starting method of switching power supply and switching power supply |
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