CN206452296U - A kind of ultra-wide input voltage range Switching Power Supply start-up circuit - Google Patents
A kind of ultra-wide input voltage range Switching Power Supply start-up circuit Download PDFInfo
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Abstract
A kind of ultra-wide input voltage range Switching Power Supply start-up circuit, including voltage stabilizing start-up circuit, controlling switch circuit, auxiliary power supply circuit and control chip.The input of described voltage stabilizing start-up circuit is connected to the input Vin of Switching Power Supply, the output end of voltage stabilizing start-up circuit is connected to the input of the controlling switch circuit, the output end of controlling switch circuit is connected to the input VCC that described control chip is powered, the assists winding NS of described auxiliary power supply circuit is a winding inside switching mode power supply transformer, and the output end of auxiliary power supply circuit also is connected to the control chip energization input VCC.The utility model can overcome existing start-up circuit in ultra-wide pressure input voltage range application, big contradiction is lost in start-up circuit when Switching Power Supply starts scarce capacity and high input voltage in low input, start-up circuit can also be closed after start completion automatically, it is to avoid start-up circuit is produced very big loss by carry load work to Switching Power Supply in some conditions.
Description
Technical field
The utility model is related to a kind of Switching Power Supply start-up circuit, and more particularly to wide input voltage range Switching Power Supply is opened
Dynamic circuit, and it is applicable the Switching Power Supply application field of wide input voltage change.
Background technology
The input voltage of Switching Power Supply has certain scope, and such as China's line voltage is 220VAC, its input range
It is required that being 165-264VAC, for the 110VAC of compatible Europe superscript, common Switching Power Supply input voltage range is 85VAC-
264VAC.In the application of DC-DC direct-current switch power supplies, generally also there is the classification of multiple inlet highways, such as communications industry is generally
48VDC is inputted, in the range of 36-75VDC, and Industry Control industry is generally 24VDC and 12VDC, and the scope of 24V inputs is
The scope of 18-36VDC, 12VDC input is 9-18VDC, and the bus of railway systems is 110VDC, and input voltage range is 66-
160VDC。
Traditional DC-DC Switching Power Supplies start-up circuit typically uses linear voltage stabilization start-up circuit as shown in Figure 1, in routine
2:In 1 input voltage range phase, under different input voltages starts, voltage-regulator diode D1 secures the final base stage of triode
Voltage, so that the final emitter voltage of triode is secured, to reach the stable purpose for starting voltage.But the type starts
There is problems with circuit.
One, in the application of ultra-wide input voltage range, module starts scarce capacity in low input and height is defeated
Start-up circuit is lost big contradiction and can not solved when entering voltage.Some current application terminal equipment are in order to adapt to worse input
Voltage environment, it is proposed that the Switching Power Supply demand of ultra-wide input voltage range, such as 4:1 or 10:1 even more high input voltage range
Demand.
Traditional DC-DC Switching Power Supply start-up circuits as shown in Figure 1, resistance R1 determines triode in start-up course
Q1 emitter current, its relation is ibq1≈ (Vin-1.5-Vccx) ÷ R1, triode Q1 base current determines colelctor electrode
Electric current, its relation is ic=β ib, and triode Q1 collector currents are almost exactly VCC starting current in start-up course.
In low input, the resistance R1 flowed through electric current is minimum, i.e. triode Q1 ic electric currents are minimum, that is, starts electricity
Stream is minimum.In order to ensure that module can normally start in low input, therefore resistance R1 maximum occurrences are limited.Work as switch
When power supply is in maximum input voltage, the electric current on R1 becomes big, the power consumption increase of long-term work, and the power consumption of long-term work is PR2=
(Vin max-Vref)2/ R1, such as designs the Switching Power Supply of 10W, 10V-100VDC input voltage, is ensureing low pressure input
While startup, during high input voltage, power consumption is up to 8W or so on start-up circuit R2, at this time, the volume of resistance, module into
Sheet, efficiency index, the heating of product can not all meet design requirement.
Secondly being：Output loading is timing under unloaded and output voltage, the problem of start-up circuit power consumption becomes big.
In circuit as shown in Figure 1, start-up circuit and assists winding output-parallel are powered to the VCC of control chip, and it is opened
Voltage is provided during dynamic by start-up circuit to power to control chip.After the completion of circuit start, the output that assists winding is produced
Voltage is established, and the voltage that a little higher than start-up circuit of the voltage is produced, the electric current of start-up circuit disconnects automatically.If start-up circuit
Output voltage is higher than assists winding output voltage, and start-up circuit will be caused to continue to undertake the load current of control chip, cause to open
The dynamic long-term power consumption increase of circuit.But the voltage that Switching Power Supply can change this winding generation under two states is electric higher than starting
Road produces the situation of voltage.
When the first state is underloading or unloaded operation, the assists winding and output winding inside Switching Power Supply are all integrated
In a transformer, its auxiliary power supply produced output exports the equivalent electricity into a doubleway output in fact with Switching Power Supply
Source.This area is both known about, and the Switching Power Supply of doubleway output has individual index cross regulation rate, exactly when main road output voltage is
Fully loaded, the voltage of two tunnels output can be uprised.When main road is output as zero load or gently loaded, the voltage of two tunnels output is low.Similarly, we
The output voltage of Switching Power Supply for it is unloaded when, the voltage of assists winding is by low 1-2V of output voltage than full load or so.So
Required for the startup voltage that the supply voltage meeting low-voltage starting circuit that assists winding is produced is produced, control chip or driving chip
Operating current all is from start-up circuit, and start-up circuit is exactly a linear power supply in fact, and the relation of its power consumption is：Ps=
(Vin-Vout) × i, in high input voltage, start-up circuit power consumption is very big, during such as 100V inputs, if the demand of control chip
If 10mA, the power consumption of start-up circuit is 10 × (100-10)=900mW.If the demand current of control chip reaches
20mA.The power consumption of start-up circuit is 20 × (100-10)=1800mW.If this bad power consumption of heat treatment burns out startup enough
Triode.
When second of working condition is that output voltage is lowered, general DC-DC module power source all possesses output voltage
Regulatory function up and down, the amplitude of accommodation general 10%, when output voltage, which is adjusted downward, to be applied, the voltage of assists winding output
10% can be adjusted downward, assists winding output voltage is will also result in less than start-up circuit output voltage, start-up circuit is also by band
Loaded work piece.
Note 1：The change voltage that Vccx exports for startup.
Note 2：Vref is the burning voltage of voltage-regulator diode.
Utility model content
The utility model provides a kind of ultra-wide input voltage range Switching Power Supply start-up circuit, and its advantage one is that this practicality is new
A kind of ultra-wide input voltage range Switching Power Supply start-up circuit of type can overcome existing start-up circuit in ultra-wide input voltage model
In the application enclosed, big lance is lost in start-up circuit when Switching Power Supply starts scarce capacity and high input voltage in low input
Shield.Its advantage two is that Switching Power Supply start-up circuit of the present utility model can close start-up circuit automatically after start completion, is kept away
Exempting from Switching Power Supply, start-up circuit is produced very big loss by carry load work in some conditions.
Such as a kind of ultra-wide input voltage range Switching Power Supply start-up circuits of Fig. 2, including voltage stabilizing start-up circuit, controlling switch electricity
Road, auxiliary power supply circuit and control chip.
The input of described voltage stabilizing start-up circuit is connected to the input Vin of Switching Power Supply, voltage stabilizing start-up circuit it is defeated
Go out the input that end is connected to the controlling switch circuit, the output end of controlling switch circuit is connected to described control chip and powered
Input VCC, the assists winding NS of described auxiliary power supply circuit is a winding inside switching mode power supply transformer, auxiliary
The output end of power supply circuit is helped also to be connected to the control chip energization input VCC.
Described voltage stabilizing start-up circuit, it is characterized in that input electric current is gathered using constant-current supply, to adapt to ultra-wide input
Voltage range；
In Switching Power Supply start-up course, described controlling switch circuit turn-on, controlling switch circuit is closed after start completion
Close, prevent start-up circuit from producing band and carrying power consumption；
Described auxiliary power supply circuit, by the output voltage of the output voltage of voltage stabilizing start-up circuit and auxiliary power supply circuit every
From opening and closing and provide a decision logic for controlling switch circuit.
Described voltage stabilizing start-up circuit include constant-current source U1, voltage-regulator diode D1, current-limiting resistance R1, adjustment triode Q1,
Anti-reverse diode D2, described constant current tube U1 input is connected to the input Vin of the power supply of module, and output end is connected to
Voltage-regulator diode D1 negative electrode, and adjustment triode Q1 base stage, voltage-regulator diode D1 anode connecting valve are connected to simultaneously
Power supply primary side reference ground.Current-limiting resistance R1 one end is connected to the input Vin of Switching Power Supply, and the other end is connected to three poles of adjustment
Pipe Q1 colelctor electrode, adjustment triode Q1 emitter stage is connected to anti-reverse diode D2 anode, anti-reverse diode D2's
Negative electrode connects the input of the controlling switch circuit, that is, described voltage stabilizing start-up circuit output end.
The voltage stabilizing start-up circuit can realize that the working mechanism of ultra-wide input voltage range is：
In the case where the different input voltage vins differed greatly start, described constant-current source can be voltage-regulator diode and adjustment three
Pole pipe base stage provides a stable electric current, allows start-up circuit normally to start, reaches the start-up circuit in ultra-wide input voltage range
The small purpose of change of power consumption difference.
It is positive-negative-positive that described controlling switch circuit, which includes triode Q2 and base stage current-limiting resistance R3, described triode Q2,
Triode.The Q2 of triode emitter stage is connected to the input of the controlling switch circuit, and triode Q2 base stages are connected to base
Limit leakage resistance R3 one end, the base stage current-limiting resistance R3 other end is connected to the voltage detecting point A of auxiliary power supply circuit, three poles
Pipe Q2 colelctor electrode is connected to the output end of controlling switch circuit.
Described auxiliary power supply circuit include assists winding NS, commutation diode D4, filter capacitor C2, filter capacitor C3,
Isolating diode D3.One end of the assists winding NS is connected to commutation diode D4 anode, and the other end of assists winding connects
It is connected to primary side reference ground.Commutation diode D4 negative electrode is connected to filter capacitor C2 one end, and is connected to isolating diode D3
Anode.The filter capacitor C2 other end is connected to the primary side reference ground of Switching Power Supply.Isolating diode D3 negative electrode is connected to
Filter capacitor C1 one end, and be connected to the output end of described auxiliary power supply circuit, that is, the control chip power supply
Electric end VCC.The filter capacitor C1 other end is also connected to the primary side reference ground of Switching Power Supply.
For the more traditional auxiliary power supply circuit of the auxiliary power supply circuit, its principal character is the increase in isolating diode
D3.Start-up circuit output voltage and assists winding output voltage are isolated in its effect, are provided accurately for controlling switch circuit
Control level.
Described control chip includes an energization input VCC and reference ground, and energization input VCC is connected to described
The output of controlling switch circuit and the output of auxiliary power supply circuit.Reference ground is connected to the primary side reference ground of Switching Power Supply.
Described controlling switch circuit breaks the operating current of the voltage stabilizing start-up circuit after Switching Power Supply start completion
Open, reached under output voltage reconcile load current be zero in the case of voltage stabilizing start-up circuit power consumption will not also become big mesh
's.
The principle that the controlling switch circuit closes voltage stabilizing start-up circuit after Switching Power Supply start completion is：Switching Power Supply
After start, the electric current of voltage stabilizing start-up circuit output passes through D2, triode Q2 emitter stage to base stage, resistance R3, to filter capacitor
C2 charges, and has base current in triode Q2 during this, causes triode Q2 emitter stage to be turned on to colelctor electrode.VCC electricity
Pressure is gradually built up, after voltage reaches the threshold voltage of control chip, and control chip work, output driving pulse signal is described
Assists winding A point voltages of powering be established, after A points voltage is higher than triode Q2 emitter voltage, triode Q2 transmittings
Pole is disconnected to colelctor electrode, and start-up circuit output current is disconnected.
The principle of domination one of the utility model power starting circuit is as follows：
Described voltage stabilizing start-up circuit is when ultra-wide input voltage range works, and U1 electric current is defeated in low input and height
The electric current for entering voltage is basically unchanged, and the power consumption in low input is (Vin min-Vref) × IU1, in high input voltage
Power consumption be (Vin max-Vref) × IU1, the change of its power consumption is than the change ratio for pressure drop on constant-current source U1.And traditional circuit
It is (Vin min-Vref) in the power consumption of low pressure2÷ R1, the power consumption under high input voltage is (Vin max-Vref)2÷ R1, its
The change of power consumption is than the duplicate ratio for pressure drop on resistance R1.
For example in the Switching Power Supply of one 10W, 10V-100VDC input voltage of same design.
As Fig. 1 uses traditional power starting circuit.
Assuming that the minimum 10mA of the emitter current of triode, can meet startup and require, triode Q1 multiplication factor
For 50 times, control chip lowest starting voltage is 8V, and to meet low input startup, then R1 can take R1=(10-8-
1.5) ÷ 0.5=1K, power consumption during low pressure is PR1min=(12-10)2÷ 1=4mW, power consumption during high input voltage is PR1max=
(100-10)2÷ 1=8100mW.
This loss is unacceptable in design.
As Fig. 2 uses start-up circuit of the present utility model, it is assumed that constant-current source U1 electric current is 0.5mA, in low input
Power consumption：Pu1min=(12-10) × 0.5=1mW, the power consumption in high input voltage：Pu1max=(100-10) × 0.5=
45mW。
Therefore the utility model is more much smaller than conventional start-up circuit power consumption in start-up circuit power consumption.
Brief description of the drawings
The existing DC-DC Switching Power Supplies start-up circuits of Fig. 1.
A kind of ultra-wide input voltage range Switching Power Supply start-up circuit of Fig. 2 the utility model case study on implementation one.
A kind of ultra-wide input voltage range Switching Power Supply start-up circuit of Fig. 3 the utility model case study on implementation two.
Embodiment
Embodiment one
Fig. 2 shows a kind of ultra-wide input voltage range Switching Power Supply start-up circuit of the utility model, existing for overcoming
Start-up circuit is in the application of ultra-wide input voltage range, and Switching Power Supply starts scarce capacity and high input in low input
Big contradiction is lost in start-up circuit during voltage.Voltage stabilizing start-up circuit is closed with automatic after Switching Power Supply start completion, it is to avoid opened
Start-up circuit is produced very big loss by carry load work in some conditions in powered-down source.It includes voltage stabilizing start-up circuit 1, control
On-off circuit 2, auxiliary power supply circuit 3 and control chip 4.
The input of described voltage stabilizing start-up circuit is connected to the input Vin of Switching Power Supply, voltage stabilizing start-up circuit
Output end is connected to the input of the controlling switch circuit, and the output end of controlling switch circuit is connected to described control chip and supplied
The input VCC of electricity, the assists winding NS of described auxiliary power supply circuit is a winding inside switching mode power supply transformer, auxiliary
The output end of power supply circuit is helped also to be connected to the control chip energization input VCC.
Described voltage stabilizing start-up circuit include constant-current source U1, voltage-regulator diode D1, current-limiting resistance R1, adjustment triode Q1,
Anti-reverse diode D2, described constant-current source U1 input is connected to the input Vin of the power supply of module, and output end is connected to
Voltage-regulator diode D1 negative electrode, and adjustment triode Q1 base stage, voltage-regulator diode D1 anode connecting valve are connected to simultaneously
Power supply primary side reference ground.Current-limiting resistance R1 one end is connected to the input Vin of Switching Power Supply, and the other end is connected to three poles of adjustment
Pipe Q1 colelctor electrode, adjustment triode Q1 emitter stage is connected to anti-reverse diode D2 anode, anti-reverse diode D2's
Negative electrode connects the input of the controlling switch circuit, that is, described voltage stabilizing start-up circuit output end.
It is positive-negative-positive that described controlling switch circuit, which includes triode Q2 and base stage current-limiting resistance R3, described triode Q2,
Triode.Triode Q2 emitter stage is connected to the input of the controlling switch circuit, and triode Q2 base stages are connected to base stage
Current-limiting resistance R3 one end, the base stage current-limiting resistance R3 other end is connected to the voltage detecting point A of auxiliary power supply circuit, triode
Q2 colelctor electrode is connected to the output end of controlling switch circuit.
Described auxiliary power supply circuit include assists winding NS, commutation diode D4, filter capacitor C2, filter capacitor C3,
Isolating diode D3.One end of the assists winding NS is connected to commutation diode D4 anode, and the other end of assists winding connects
It is connected to primary side reference ground.Commutation diode D4 negative electrode is connected to filter capacitor C2 one end, and is connected to isolating diode D3
Anode.The filter capacitor C2 other end is connected to the primary side reference ground of Switching Power Supply.Isolating diode D3 negative electrode is connected to
Filter capacitor C1 one end, and be connected to the output end of described auxiliary power supply circuit, that is, the control chip power supply
Electric end VCC.The filter capacitor C1 other end is also connected to the primary side reference ground of Switching Power Supply.
Described control chip includes an energization input VCC and reference ground, and energization input VCC is connected to described
The output of controlling switch circuit and the output of auxiliary power supply circuit.Reference ground is connected to the primary side reference ground of Switching Power Supply.
The operation principle of Switching Power Supply start-up circuit described in the utility model in utility model content it is stated that
This is repeated no more.
Case study on implementation two
Fig. 3 show the circuit diagram of the utility model case study on implementation two, the difference of case study on implementation two and case study on implementation one be
Increase discharge resistance R4 in controlling switch circuit, resistance R4 one end is connected to control triode Q2 base stage, other end connection
To the primary side reference ground of Switching Power Supply.
The circuit of case study on implementation one is in start-up course, and the condition of control triode Q2 conductings has two, and one is R3 electricity
Resistance is charged to C2 filter capacitors, and after charging complete, triode Q2 can be closed automatically.Another is that assists winding output voltage is built
Closing control triode Q2 after vertical.Resistance R4 is returned for a long time to control triode Q2 base current to provide one in present case
Road.
Case study on implementation two is that can avoid the parameter setting because of resistance R3 and filter capacitor C2 compared with the advantage of case study on implementation one
It is improper to cause control triode Q2 to be closed in advance when assists winding output voltage is not set up also.
It the above is only preferred embodiment of the present utility model, it is noted that above-mentioned preferred embodiment should not be regarded
For to limitation of the present utility model, protection domain of the present utility model should be defined by claim limited range.For
For those skilled in the art, do not departing from spirit and scope of the present utility model, can also make some
Improvements and modifications, these improvements and modifications also should be regarded as protection domain of the present utility model.Protection domain of the present utility model should
It is defined when by claim limited range.
Claims (6)
1. a kind of ultra-wide input voltage range Switching Power Supply start-up circuit, it is characterised in that：Opened including voltage stabilizing start-up circuit, control
Powered-down road, auxiliary power supply circuit and control chip；The input of described voltage stabilizing start-up circuit is connected to the input of Switching Power Supply
Vin is held, the output end of voltage stabilizing start-up circuit is connected to the input of the controlling switch circuit, and the output end of controlling switch circuit connects
The energization input VCC of described control chip is connected to, the assists winding NS of described auxiliary power supply circuit is Switching Power Supply change
A winding inside depressor, the output end of auxiliary power supply circuit also is connected to the energization input VCC of the control chip；
Described voltage stabilizing start-up circuit, gathers input electric current, to adapt to ultra-wide input voltage range using constant-current supply；
In Switching Power Supply start-up course, described controlling switch circuit turn-on, controlling switch circuit is closed after start completion, is prevented
Only start-up circuit produces band and carries power consumption；
Described auxiliary power supply circuit, the output voltage of the output voltage of voltage stabilizing start-up circuit and auxiliary power supply circuit is isolated,
Opening and closing a decision logic is provided for controlling switch circuit.
2. a kind of ultra-wide input voltage range Switching Power Supply start-up circuit according to claim 1, it is characterised in that：It is described
Voltage stabilizing start-up circuit include constant-current source U1, voltage-regulator diode D1, current-limiting resistance R1, adjustment triode Q1, anti-reverse diode
D2, described constant-current source U1 input are connected to the input Vin of Switching Power Supply, and the output end of the constant-current source U1 is connected to
Voltage-regulator diode D1 negative electrode, and adjustment triode Q1 base stage, voltage-regulator diode D1 anode connecting valve are connected to simultaneously
Power supply primary side reference ground；Current-limiting resistance R1 one end is connected to the input Vin of Switching Power Supply, and the current-limiting resistance R1 other end connects
Adjustment triode Q1 colelctor electrode is connected to, adjustment triode Q1 emitter stage is connected to anti-reverse diode D2 anode, counnter attack
The input of the controlling switch circuit is connected to diode D2 negative electrode.
3. a kind of ultra-wide input voltage range Switching Power Supply start-up circuit according to claim 1, it is characterised in that：It is described
Controlling switch circuit include triode Q2 and base stage current-limiting resistance R3；Triode Q2 emitter stage is connected to the controlling switch
The input of circuit, triode Q2 base stage is connected to base stage current-limiting resistance R3 one end, the base stage current-limiting resistance R3 other end
The voltage detecting point A of auxiliary power supply circuit is connected to, triode Q2 colelctor electrode is connected to the output end of controlling switch circuit.
4. a kind of ultra-wide input voltage range Switching Power Supply start-up circuit according to claim 1, it is characterised in that：It is described
Auxiliary power supply circuit include assists winding NS, commutation diode D4, filter capacitor C2, filter capacitor C3, isolating diode D3；
One end of the assists winding NS is connected to commutation diode D4 anode, and the assists winding NS other end is connected to primary side reference
Ground；Commutation diode D4 negative electrode is connected to filter capacitor C2 one end, and is connected to isolating diode D3 anode；Filtered electrical
The other end for holding C2 is connected to the primary side reference ground of Switching Power Supply；Isolating diode D3 negative electrode is connected to the one of filter capacitor C1
End, and it is connected to the output end of described auxiliary power supply circuit；The filter capacitor C1 other end is also connected to the original of Switching Power Supply
Side reference ground.
5. a kind of ultra-wide input voltage range Switching Power Supply start-up circuit according to claim 3, it is characterised in that：It is described
Controlling switch circuit also include discharge resistance R4, discharge resistance R4 one end is connected to triode Q2 base stage, discharge resistance
The R4 other end is connected to the primary side reference ground of Switching Power Supply.
6. a kind of ultra-wide input voltage range Switching Power Supply start-up circuit according to claim 3 or 5, it is characterised in that：
Described triode Q2 is PNP type triode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621176833.4U CN206452296U (en) | 2016-10-27 | 2016-10-27 | A kind of ultra-wide input voltage range Switching Power Supply start-up circuit |
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| CN201621176833.4U CN206452296U (en) | 2016-10-27 | 2016-10-27 | A kind of ultra-wide input voltage range Switching Power Supply start-up circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508458A (en) * | 2017-09-28 | 2017-12-22 | 广州中逸光电子科技有限公司 | A kind of start-up circuit of super wide voltage accessory power supply PWM chip |
| CN108566080A (en) * | 2018-05-24 | 2018-09-21 | 广州金升阳科技有限公司 | A kind of started with high voltage and constant current circuit |
| CN112838756A (en) * | 2021-01-04 | 2021-05-25 | 中车株洲电力机车研究所有限公司 | Switching power supply starts supply circuit |
| CN113433996A (en) * | 2020-03-23 | 2021-09-24 | 捷拓科技股份有限公司 | Auxiliary power supply circuit with wide input voltage range |
| CN113824304A (en) * | 2021-11-23 | 2021-12-21 | 西安空天紫电等离子体技术有限公司 | Input/output power supply system based on vehicle-mounted plasma driving power supply |
| US11545885B2 (en) | 2020-03-19 | 2023-01-03 | Minmax Technology Co., Ltd. | Auxiliary power supply circuit operating within a wide input voltage range |
| CN117498510A (en) * | 2024-01-03 | 2024-02-02 | 唐泽制动器(天津)有限公司 | Constant voltage charging circuit of electric vehicle battery |
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2016
- 2016-10-27 CN CN201621176833.4U patent/CN206452296U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508458A (en) * | 2017-09-28 | 2017-12-22 | 广州中逸光电子科技有限公司 | A kind of start-up circuit of super wide voltage accessory power supply PWM chip |
| CN108566080A (en) * | 2018-05-24 | 2018-09-21 | 广州金升阳科技有限公司 | A kind of started with high voltage and constant current circuit |
| US11545885B2 (en) | 2020-03-19 | 2023-01-03 | Minmax Technology Co., Ltd. | Auxiliary power supply circuit operating within a wide input voltage range |
| CN113433996A (en) * | 2020-03-23 | 2021-09-24 | 捷拓科技股份有限公司 | Auxiliary power supply circuit with wide input voltage range |
| CN112838756A (en) * | 2021-01-04 | 2021-05-25 | 中车株洲电力机车研究所有限公司 | Switching power supply starts supply circuit |
| CN113824304A (en) * | 2021-11-23 | 2021-12-21 | 西安空天紫电等离子体技术有限公司 | Input/output power supply system based on vehicle-mounted plasma driving power supply |
| CN117498510A (en) * | 2024-01-03 | 2024-02-02 | 唐泽制动器(天津)有限公司 | Constant voltage charging circuit of electric vehicle battery |
| CN117498510B (en) * | 2024-01-03 | 2024-03-05 | 唐泽制动器(天津)有限公司 | Constant voltage charging circuit of electric vehicle battery |
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