CN113433996B - Auxiliary power supply circuit with wide input voltage range - Google Patents
Auxiliary power supply circuit with wide input voltage range Download PDFInfo
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- CN113433996B CN113433996B CN202010206050.0A CN202010206050A CN113433996B CN 113433996 B CN113433996 B CN 113433996B CN 202010206050 A CN202010206050 A CN 202010206050A CN 113433996 B CN113433996 B CN 113433996B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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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
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- Dc-Dc Converters (AREA)
Abstract
The application provides an auxiliary power supply circuit with a wide input voltage range, which is used for supplying power to a working voltage conversion circuit connected with a direct-current power supply converter with the wide input voltage range, and comprises a voltage follower unit and a voltage comparison unit, wherein the voltage follower unit comprises an electronic switch, a resistor and a voltage stabilizing diode, a first end and a second end of the electronic switch are respectively and electrically connected with a voltage input end and a voltage output end of the working voltage conversion circuit, the resistor is electrically connected between the first end and a control end of the electronic switch, a cathode end of the voltage stabilizing diode is electrically connected with a control end of the electronic switch, and a detection end and an output end of the voltage comparison unit are respectively and electrically connected with a voltage input end of the working voltage conversion circuit and the control end of the electronic switch; the second end of the electronic switch can provide stable auxiliary voltage before and after the input voltage rises to the breakdown of the zener diode.
Description
Technical Field
The present invention relates to a power supply circuit, and more particularly to an auxiliary power supply circuit with a wide input voltage range.
Background
The wide input voltage range DC power converter is characterized in that the wide input voltage range DC power converter can receive the input voltage range from low voltage to high voltage and generate an output voltage after conversion, and the output voltage can be kept at a certain value so as to be supplied to a next stage circuit (load). For example, the circuit structure of the wide input voltage range dc power converter may include electronic components such as a transformer, an operating voltage conversion circuit, an Integrated Circuit (IC), a feedback circuit, and a transistor …, where the Integrated Circuit (IC) may be a pulse width modulation controller (PWM controller).
In the foregoing wide input voltage range dc power converter, the operating voltage of the electronic device is from the operating voltage converting circuit, which may be, for example, a Buck converter (Buck converter), and the input voltage received by the Buck converter is the same as the input voltage of the dc power converter, and also falls within the wide input voltage range, and the Buck converter converts the input voltage into the operating voltage required by the electronic device.
The stable operating voltage is a basic requirement for maintaining normal operation of each electronic device, however, before the step-down circuit reaches a voltage-stabilizing state in actual operation, for example, when the magnitude of the input voltage of the step-down circuit is close to the magnitude of the output voltage (i.e., the operating voltage), the waveform of the output voltage of the step-down circuit may generate an unstable ripple (ripple), which results in unstable operating voltage provided to the electronic device and directly affects normal operation of the electronic device.
Disclosure of Invention
The invention provides an auxiliary power supply circuit with a wide input voltage range, which is used for supplying power to a working voltage conversion circuit connected with a direct current power supply converter with the wide input voltage range, so that the invention provides stable working voltage required by an electronic element before the working voltage conversion circuit reaches a voltage stabilizing state, and the defect that the electronic element cannot receive the stable working voltage and cannot normally operate in the prior art is overcome.
The invention provides an auxiliary power supply circuit with a wide input voltage range, which is connected with a working voltage conversion circuit of a direct current power supply converter with the wide input voltage range in a power supply way, and comprises:
a voltage follower unit comprising:
the electronic switch is provided with a first end, a second end and a control end, wherein the first end is electrically connected with a voltage input end of the working voltage conversion circuit, and the second end is electrically connected with a voltage output end of the working voltage conversion circuit;
a resistor electrically connected between the first end and the control end of the electronic switch; a kind of electronic device with high-pressure air-conditioning system
The cathode end of the voltage stabilizing diode is electrically connected with the control end of the electronic switch; and
the voltage comparison unit comprises a detection end and an output end, wherein the detection end is electrically connected with the voltage input end of the working voltage conversion circuit, and the output end of the voltage comparison unit is electrically connected with the control end of the electronic switch.
As described above, the electronic switch of the voltage follower unit is a first electronic switch, the breakdown voltage of the zener diode is smaller than a threshold voltage, the threshold voltage is equal to a steady-state output voltage of the operating voltage conversion circuit, and the breakdown voltage of the zener diode is smaller than the steady-state output voltage; the voltage comparing unit includes: the comparator is provided with a normal phase input end, an opposite phase input end and an output end, wherein the normal phase input end is used as the detection end of the voltage comparison unit, the opposite phase input end is electrically connected with a reference voltage, the reference voltage corresponds to a protection voltage, and the protection voltage is larger than the threshold voltage; the second electronic switch is provided with a first end, a second end and a control end, wherein the first end of the second electronic switch is used as the output end of the voltage comparison unit, the second end of the second electronic switch is grounded, and the control end of the second electronic switch is electrically connected with the output end of the comparator.
The first electronic switch is a bipolar junction transistor, and the first terminal, the second terminal and the control terminal are respectively a collector terminal, an emitter terminal and a base terminal.
The second electronic switch is an N-channel mosfet having a drain terminal, a source terminal and a gate terminal, respectively.
When the input voltage received by the working voltage conversion circuit is close to the output voltage in the voltage stabilizing state, the output voltage generates an unstable phenomenon of voltage ripple (ripple), and at the moment, according to the circuit structure of the auxiliary power supply circuit with the wide input voltage range, in the voltage follower, when the input voltage rises to the voltage stabilizing diode before breakdown, the voltage of the second end of the electronic switch is approximately equal to the input voltage, and the electronic element serving as the auxiliary voltage can be directly provided for the electronic element of the direct current power supply converter with the wide input voltage range; when the input voltage rises to the voltage stabilizing diode breakdown, the second end of the electronic switch can provide stable auxiliary voltage for the electronic element after voltage stabilization. As described above, the electronic device can operate normally under the stable operating voltage before and after the input voltage rises to the voltage stabilizing diode breakdown, and the defect that the electronic device cannot receive the stable operating voltage and cannot operate normally in the prior art is overcome. As the input voltage increases, the output voltage of the working voltage conversion circuit is stabilized after the working voltage conversion circuit reaches a voltage stabilizing state, and the voltage comparison unit can close the electronic switch of the voltage follower unit.
Drawings
FIG. 1 is a block diagram of an embodiment of an auxiliary power supply circuit with a wide input voltage range electrically connected to a DC power converter with a wide input voltage range.
FIG. 2 is a schematic circuit diagram of an auxiliary power supply circuit with a wide input voltage range according to an embodiment of the present invention.
FIG. 3 is a schematic circuit diagram of an auxiliary power supply circuit with a wide input voltage range according to an embodiment of the present invention.
FIG. 4 is a voltage timing diagram of an auxiliary power supply circuit with a wide input voltage range according to an embodiment of the present invention.
Reference numerals illustrate:
10 wide input voltage range DC power converter
100 working voltage converting circuit 101 voltage input terminal
102 voltage output end 200 auxiliary power supply circuit
Output end of 20-voltage follower unit 300
30 voltage comparison unit 31 comparator
Vin input voltage Vout output voltage
V B Output voltage Vcc operating voltage
Q1 electronic switch R3 resistor
ZD1 voltage-stabilizing diode V E Auxiliary voltage
V DET R1 resistor at detection end
R2 resistor Q2 second electronic switch
V Z Breakdown voltage C1 capacitor
V X Voltage at control terminal of electronic switch
Detailed Description
The technical means adopted by the invention to achieve the preset aim are further described below by matching with the drawings and the preferred embodiments of the invention.
Referring to fig. 1, the wide input voltage range auxiliary power supply circuit 200 of the present invention can be applied to a wide input voltage range dc power converter 10, where the wide input voltage range dc power converter 10 is characterized by being capable of receiving a low voltage to a high voltage input voltage range and generating an output voltage Vout after conversion, and the output voltage Vout can be kept at a certain value for being supplied to a next stage (load). Generally, the circuit structure of the wide input voltage range dc power converter 10 may include, for example, a transformer, an operating voltage conversion circuit, an Integrated Circuit (IC), a feedback circuit, and a transistor …, wherein the operating voltage of the electronic component is from the operating voltage conversion circuit; for example, the Integrated Circuit (IC) may be, for example, a pulse width modulation controller (PWM controller) … or the like.
Referring to fig. 2, the operating voltage converting circuit 100 has a voltage input terminal 101 and a voltage output terminal 102, wherein the voltage input terminal 101 is configured to receive an input voltage Vin of direct current, the input voltage Vin is in a wide input voltage range, and the voltage output terminal 102 generates an output voltage V B . When the input voltage Vin is greater than a threshold voltage, the operating voltage converting circuit 100 can reach a voltage-stabilizing state to let the output voltage V B A steady-state output voltage is formed by keeping the voltage at a certain value, and the steady-state output voltage can be used as the working voltage Vcc of the electronic element, wherein the threshold voltage can be equal to the steady-state output voltage; for example, the input voltage Vin may be in the range of 0V to 160V, and the steady-state output voltage and the threshold voltage may be constant values of 12V, but are not limited to the above voltage values. The operating voltage converting circuit 100 may be, for example, a conventional Buck (Buck) circuit, a Forward (Forward) circuit, a Flyback (Flyback) circuit, a Push-Pull (Push-Pull) circuit …, etc., and the Buck (Buck) circuit is taken as an example of the operating voltage converting circuit 100.
As shown in fig. 2, an embodiment of the auxiliary power supply circuit 200 of the present invention includes a voltage follower unit 20 and a voltage comparing unit 30.
The voltage follower unit 20 includes an electronic switch Q1, a resistor R3 and a Zener diode (Zener diode) ZD1. The electronic switch Q1 is a three-terminal device and has a first terminal electrically connected to the operating voltage converting circuit, a second terminal and a control terminal100, a second terminal electrically connected to the voltage output terminal 102 of the operating voltage converting circuit 100 for outputting an auxiliary voltage V E The auxiliary voltage V E May be slightly less than the steady state output voltage, for example may be less than 1V; the resistor R3 is electrically connected between the first end and the control end of the electronic switch Q1; the cathode terminal of the zener diode ZD1 is electrically connected to the control terminal of the electronic switch Q1, the anode terminal of the zener diode ZD1 can be grounded, and the breakdown voltage V of the zener diode ZD1 Z Less than the steady state output voltage. In the embodiment shown in fig. 2, the first terminal of the electronic switch Q1 is a Collector terminal (Collector), the second terminal is an Emitter terminal (Emitter), and the control terminal is a Base terminal (Base). Accordingly, the connection structure of the electronic switch Q1 and the resistor R3 forms an Emitter follower (Emitter follower), and when the electronic switch Q1 is turned on, the auxiliary voltage V E Subtracting 0.7V from the base voltage of the electronic switch Q1; when the electronic switch Q1 is turned off, the auxiliary voltage V E Closed with no output.
The voltage comparing unit 30 includes a detecting end V DET And an output terminal 300, the detecting terminal V DET The voltage input terminal 101 of the operating voltage converting circuit 100 is electrically connected to detect the magnitude of the input voltage Vin, and in the embodiment shown in fig. 2, the detecting terminal V of the voltage comparing unit 30 DET A voltage dividing circuit formed by two resistors R1, R2 to detect the magnitude of the input voltage Vin; the output terminal 300 of the voltage comparing unit 30 is electrically connected to the control terminal of the electronic switch Q1, so as to drive the electronic switch Q1 to be turned on or off according to the magnitude of the input voltage Vin.
In the embodiment of the present invention, please refer to fig. 3, for convenience of description, the electronic switch Q1 of the voltage follower unit 20 is referred to as a first electronic switch, and a possible embodiment of the voltage comparing unit 30 may include a comparator 31 and a second electronic switch Q2.
The comparator 31 has a positive input terminal serving as the voltage comparing unit 30, an inverting input terminal and an output terminalDetection end V DET The inverting input terminal is electrically connected with a reference voltage Vref, the reference voltage Vref corresponds to a protection voltage, the protection voltage is greater than the threshold voltage, the reference voltage Vref can be equal to the voltage division of the protection voltage in the resistor R2, as the voltage value mentioned before, the threshold voltage can be 12V, and the protection voltage can be 15V; the second electronic switch Q2 is a three-terminal device and has a first terminal, a second terminal and a control terminal, the first terminal of the second electronic switch Q2 is used as the output terminal 300 of the voltage comparing unit 30, the second terminal of the second electronic switch Q2 is grounded, and the control terminal of the second electronic switch Q2 is electrically connected to the output terminal of the comparator 31. The second electronic switch Q2 may be a transistor, such as a Bipolar Junction Transistor (BJT) or a Field Effect Transistor (FET), but is not limited thereto, and in the embodiment shown in fig. 3, the second electronic switch Q2 is an N-channel metal oxide semiconductor field effect transistor (N-channel MOSFET), for example, the first terminal is a Drain terminal (Drain), the second terminal is a Source terminal (Source), and the control terminal is a Gate terminal (Gate).
The following describes the technical effects achieved by the circuit architecture according to the present invention with reference to the waveform diagram shown in fig. 4. Whether the operating voltage converting circuit 100 reaches the voltage stabilizing state is based on whether the input voltage Vin is greater than the threshold value. The voltage at the second end of the electronic switch Q1 is approximately equal to the input voltage Vin based on the characteristics of the emitter follower before the time point t1 from 0V, and can be directly provided as the auxiliary voltage V E For the electronic components of the wide input voltage range DC power converter 10, the input voltage Vin is still small and cannot cause breakdown of the zener diode ZD1, and the detection terminal V DET The voltage of the second electronic switch Q2 is also smaller than the reference voltage Vref, so that the comparator 31 outputs a low voltage, the voltage V of the control terminal of the electronic switch Q1 is turned off X Reference is made to fig. 4.
Between time points t1 and t2, the input voltage Vin approaches the output voltage V B The operating voltage conversion circuit 100 does not reach a voltage-stabilizing state, so the output voltage V B The waveform between time points t1 and t2 can be seen as unstable voltage ripple (ripple)With a voltage drop, the input voltage Vin is large enough to cause breakdown of the zener diode ZD1, the voltage V at the control terminal of the electronic switch Q1 X Maintained at the breakdown voltage V of the zener diode ZD1 Z The breakdown voltage V Z Can turn on the electronic switch Q1, so V E ＝V Z -0.7 (V). Because the electronic switch Q1 is conductive, the auxiliary voltage V can be output E To supply the working voltage Vcc, from an auxiliary voltage V E The voltage drop of the voltage ripple is complemented to maintain the stability of the operating voltage Vcc. Between the time points t1 and t2, the input voltage Vin is still smaller than the threshold voltage, the detection terminal V DET The voltage of the second electronic switch Q2 is still smaller than the reference voltage Vref.
Between the time points t2 and t3, the input voltage Vin reaches the threshold voltage, which represents that the operating voltage converting circuit 100 reaches a voltage-stabilized state, and a stable output voltage V can be output B (steady-state output voltage) as the operating voltage Vcc. At this time, the input voltage Vin still does not reach the protection voltage, so the detection terminal V DET The voltage of the second electronic switch Q2 is still smaller than the reference voltage Vref. On the other hand, as described above, the zener diode ZD1 has a breakdown voltage V Z An output voltage V smaller than a constant value after voltage stabilization B (steady-state output voltage) so that the emitter and base terminals of the electronic switch Q1 are in reverse bias (reverse-bias) to result in an auxiliary voltage V E Is turned off passively, mainly by the output voltage V B The (steady state output voltage) provides the operating voltage Vcc.
After time point t3, the output voltage V B The (steady state output voltage) provides the operating voltage Vcc. When the input voltage Vin reaches the protection voltage, the detection terminal V DET The comparator 31 outputs a high voltage, and the second electronic switch Q2 is turned on to turn off the voltage follower unit 20 when the base terminal of the electronic switch Q1 is at a low voltage. It should be noted that the present invention lets the auxiliary voltage V at the time points t2 to t3 E Passively turning off, rather than directly turning off the electronic switch Q1 at time t2, so that it can be effectively prevented fromHigh voltage starting instant, auxiliary voltage V E Rising speed ratio output voltage V B Faster, the electronic switch Q1 is instantaneously subjected to high power, resulting in burnout.
In summary, when the input voltage Vin approaches the threshold voltage, the output voltage V B An unstable voltage ripple (ripple) is generated, but a relatively stable auxiliary voltage V is provided by the second terminal of the electronic switch Q1 of the voltage follower unit 20 of the present invention E Achieving the technical effect of enabling the electronic component to normally operate under the stable operating voltage Vcc. When the input voltage Vin is greater than the threshold voltage, the operating voltage converting circuit 100 is in a voltage-stabilized state, so that the voltage output terminal 102 thereof provides the output voltage V B (steady-state output voltage) is supplied as an operating voltage Vcc to the electronic component. Overall, the operating voltage Vcc is stable regardless of whether the input voltage Vin is at a low voltage or a high voltage, ensuring that the electronic component operates properly.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (3)
1. An auxiliary power supply circuit with a wide input voltage range is characterized in that the auxiliary power supply circuit is connected with an operating voltage conversion circuit of a direct current power supply converter with the wide input voltage range in a power supply way, and comprises:
a voltage follower unit comprising:
the electronic switch is provided with a first end, a second end and a control end, wherein the first end is electrically connected with a voltage input end of the working voltage conversion circuit, and the second end is electrically connected with a voltage output end of the working voltage conversion circuit;
a resistor electrically connected between the first end and the control end of the electronic switch; a kind of electronic device with high-pressure air-conditioning system
The cathode end of the voltage stabilizing diode is electrically connected with the control end of the electronic switch; and
the voltage comparison unit comprises a detection end and an output end, the detection end is electrically connected with the voltage input end of the working voltage conversion circuit, and the output end of the voltage comparison unit is electrically connected with the control end of the electronic switch;
the electronic switch of the voltage follower unit is a first electronic switch, the breakdown voltage of the voltage stabilizing diode is smaller than a threshold voltage, the threshold voltage is equal to a steady-state output voltage of the working voltage conversion circuit, and the breakdown voltage of the voltage stabilizing diode is smaller than the steady-state output voltage;
the voltage comparing unit includes:
the comparator is provided with a normal phase input end, an opposite phase input end and an output end, wherein the normal phase input end is used as the detection end of the voltage comparison unit, the opposite phase input end is electrically connected with a reference voltage, the reference voltage corresponds to a protection voltage, and the protection voltage is larger than the threshold voltage; and
the second electronic switch is provided with a first end, a second end and a control end, the first end of the second electronic switch is used as the output end of the voltage comparison unit, the second end of the second electronic switch is grounded, and the control end of the second electronic switch is electrically connected with the output end of the comparator.
2. The wide input voltage range auxiliary power supply circuit of claim 1, wherein the first electronic switch is a bipolar junction transistor having a collector terminal, an emitter terminal, and a base terminal at a first terminal, a second terminal, and a control terminal, respectively.
3. The wide input voltage range auxiliary power supply circuit of claim 1, wherein the second electronic switch is an N-channel mosfet having a drain terminal, a source terminal, and a gate terminal at the first terminal, the second terminal, and the control terminal, respectively.
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| CN202010206050.0A CN113433996B (en) | 2020-03-23 | 2020-03-23 | Auxiliary power supply circuit with wide input voltage range |
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| CN202010206050.0A CN113433996B (en) | 2020-03-23 | 2020-03-23 | Auxiliary power supply circuit with wide input voltage range |
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| CN113433996B true CN113433996B (en) | 2023-05-23 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TW201509045A (en) * | 2013-05-08 | 2015-03-01 | Hon Hai Prec Ind Co Ltd | Voltage protection circuit |
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| JP2797568B2 (en) * | 1989-12-21 | 1998-09-17 | 松下電器産業株式会社 | DC power supply |
| JP4225630B2 (en) * | 1999-05-27 | 2009-02-18 | 株式会社ルネサステクノロジ | Voltage generation circuit |
| CN2419735Y (en) * | 2000-02-02 | 2001-02-14 | 海信集团公司 | Switch electric power with wide inputting range |
| JP2001309653A (en) * | 2000-04-20 | 2001-11-02 | Sony Corp | Switching power supply device |
| DE10144591C2 (en) * | 2001-09-11 | 2003-09-04 | Semikron Elektronik Gmbh | Circuit arrangement for voltage regulation |
| JP2009089451A (en) * | 2007-09-27 | 2009-04-23 | Smk Corp | Dc-dc converter |
| US9268349B2 (en) * | 2013-12-06 | 2016-02-23 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Circuit and method for optimizing input voltage range of IC chip |
| CN205318269U (en) * | 2015-11-05 | 2016-06-15 | 北京动力源科技股份有限公司 | Adjustable linear stabilized power supply and have electrical equipment of this power |
| CN206452296U (en) * | 2016-10-27 | 2017-08-29 | 广州金升阳科技有限公司 | A kind of ultra-wide input voltage range Switching Power Supply start-up circuit |
| CN108173426A (en) * | 2018-02-26 | 2018-06-15 | 广州金升阳科技有限公司 | A kind of start-up circuit of low conduction voltage drop |
| TWM591640U (en) * | 2019-11-18 | 2020-03-01 | 捷拓科技股份有限公司 | Power conversion circuit with single-stage double-switch wide input range |
| CN211506286U (en) * | 2020-03-23 | 2020-09-15 | 捷拓科技股份有限公司 | Auxiliary power supply circuit with wide input voltage range |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TW201509045A (en) * | 2013-05-08 | 2015-03-01 | Hon Hai Prec Ind Co Ltd | Voltage protection circuit |
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