CN207638549U - A kind of detection circuit, power supply constant-current circuit and power supply constant-current device - Google Patents
A kind of detection circuit, power supply constant-current circuit and power supply constant-current device Download PDFInfo
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- CN207638549U CN207638549U CN201721732421.9U CN201721732421U CN207638549U CN 207638549 U CN207638549 U CN 207638549U CN 201721732421 U CN201721732421 U CN 201721732421U CN 207638549 U CN207638549 U CN 207638549U
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Abstract
The utility model discloses a kind of detection circuits, the negative input of amplifier is connected by the non-moving end of divider resistance and switch in detection circuit, so, it no longer include just switch between the positive input and negative input of amplifier, pressure drop between the positive input and negative input of amplifier also no longer includes just the pressure drop of switch, more will not include the pressure drop of switch again in the calculating process of operational amplifier circuit, so that the internal resistance of switch can not influence the calculating process of operational amplifier circuit, the output current calculated is more accurate, and the accuracy of testing result gets a promotion.And, no matter whether the used internal resistance switched of power supply constant-current device of batch belt switch is consistent, also the accuracy of the output current calculated will not be influenced because the pressure drop on each switch is different, can further promotes the accuracy of the constant current testing result of batch power supply constant-current device.In addition, the invention also discloses a kind of power supply constant-current circuit and power supply constant-current device, effect are as above.
Description
Technical field
The utility model is related to electronic circuit field, more particularly to a kind of detection circuit, power supply constant-current circuit and power supply are permanent
Flow device.
Background technology
For power supply constant-current device, the stability of output current is one of its most important index, is realized to power supply
The constant current detection of constant-current device is of great significance.
Fig. 1 is the circuit diagram of constant current detection circuit in the prior art.As shown in Figure 1, in the prior art, amplifier U1B
Negative input connect with the moved end (ends Vd) of switch SW, operation is error between the ends Vd and the ends amplifier Vc, and due to
Pressure drop between the ends Vc and the ends Vd includes the pressure drop of switch SW, and the calculating process of amplifier U1B can also include the pressure drop of switch SW,
To be impacted to calculating process so that the output current calculated is not accurate enough, and there are errors for testing result.Moreover, right
For the power supply constant-current device of belt switch, since the internal resistance of used switch is difficult to remain exactly the same, so by switching
Pressure drop caused by error it is also different, further increase the output current error of batch power supply constant-current device.
Therefore, how the accuracy of the constant current testing result of elevator belt Switching Power Supply constant-current device is those skilled in the art
The technical issues that need to address at present.
Utility model content
The purpose of this utility model is to provide a kind of detection circuit, power supply constant-current circuit and power supply constant-current device, Neng Gouti
Rise the accuracy of the constant current testing result of belt switch power supply constant-current device.
In order to solve the above-mentioned technical problem, a kind of detection circuit provided by the utility model is applied to the power supply of belt switch
Constant-current device, including operational amplifier circuit further include：
For the divider resistance of partial pressure, the first end of the divider resistance is connect with the non-moving end of the switch, described point
The second end of piezoresistance is connect with the negative input of amplifier in the operational amplifier circuit.
Preferably, it includes the first divider resistance, the second divider resistance and third divider resistance that the divider resistance, which has,；
The first end of first divider resistance is connect with the first non-moving end of the switch, second divider resistance
First end is connect with the second non-moving end of the switch, and the first end of the third divider resistance is electric with first partial pressure simultaneously
The second end of resistance is connected with the second end of second divider resistance, and the second end of the third divider resistance and the negative sense are defeated
Enter end connection；
Wherein, the non-moving end of the switch includes first non-moving end and second non-moving end.
Preferably, the resistance value of first divider resistance, second divider resistance and the third divider resistance exists
Between 200 ohm to 20000 ohm.
Preferably, the operational amplifier circuit specifically include amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance,
5th resistance, the first capacitance, the second capacitance and third capacitance；
The first end of the first end of the first resistor, the first end of the second resistance and the first capacitance is simultaneously by the
Six resistance are connect with first divider resistance, or are connect with second divider resistance by the 7th resistance, first electricity
The second end of the second end of resistance, the second end of the second resistance and the first capacitance while the positive input of the amplifier and institute
State the first end connection of 3rd resistor, the second termination reference voltage of the 3rd resistor；
The negative input of the amplifier is connect with the first end of the 4th resistance, and the second end of the 4th resistance is logical
Second capacitance is crossed to connect with the output end of the amplifier；
The power input of the amplifier while the first end with the first end and the third capacitance of the 5th resistance
Connection, the second termination input power of the 5th resistance, the second end of the third capacitance and the ground terminal of the amplifier are equal
Ground connection；
Wherein, the detection circuit includes the 6th resistance and the 7th resistance.
Preferably, the amplifier is specially LM358.
Preferably, the resistance value of the 6th resistance and the 7th resistance is between 0.05 ohm to 0.3 ohm.
In order to solve the above-mentioned technical problem, a kind of power supply constant-current circuit that the utility model also provides, including：
Rectification circuit for AC signal to be converted to direct current signal, the tune for adjusting output voltage and output current
Economize on electricity road and any of the above-described kind of detection circuit exported for arithmetic eror and by the error；
The output end of operational amplifier circuit in the detection circuit is connect with the adjusting circuit.
In order to solve the above-mentioned technical problem, a kind of power supply constant-current device that the utility model also provides, including power supply constant current
Device body and circuit board are provided with any of the above-described kind of power supply constant-current circuit on the circuit board.
In terms of existing technologies, a kind of detection circuit provided by the utility model, the power supply for being applied to belt switch are permanent
Device, including operational amplifier circuit are flowed, further includes：For the divider resistance of partial pressure, the first end of the divider resistance and the switch
Non-moving end connection, the second end of the divider resistance connect with the negative input of the operational amplifier circuit：Point for partial pressure
Piezoresistance, the first end of the divider resistance are connect with the non-moving end of the switch, the second end of the divider resistance with it is described
The negative input connection of amplifier in operational amplifier circuit.It can be seen that the negative sense of the amplifier of detection circuit provided by the utility model
Input terminal is connected by the non-moving end of divider resistance and switch, in this way, between the positive input and negative input of amplifier just
No longer include switch, the pressure drop between the positive input and negative input of amplifier also no longer includes just the pressure drop of switch, fortune
More will not include the pressure drop of switch again in the calculating process on electric discharge road, so that the internal resistance of switch can not influence operational amplifier circuit
Calculating process, the output current calculated is more accurate, so promoted testing result accuracy.Moreover, no matter batch band
Whether the internal resistance switched used by the power supply constant-current device of switch is consistent, also will not be different because of the pressure drop on each switch
And therefore the accuracy for influencing the output current calculated can further promote batch power supply constant current using this detection circuit
The accuracy of the constant current testing result of device.In addition, the utility model additionally provides a kind of power supply constant-current circuit and power supply constant current
Device, effect are as above.
Description of the drawings
In order to illustrate more clearly of the utility model embodiment, letter will be done to attached drawing needed in the embodiment below
Single introduction, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the utility model, general for this field
For logical technical staff, without creative efforts, other accompanying drawings are can also be obtained according to these attached drawings.
Fig. 1 is the circuit diagram of constant current detection circuit in the prior art；
Fig. 2 is the structural schematic diagram that the utility model implements a kind of detection circuit provided；
Fig. 3 is the circuit diagram figure of divider resistance in a kind of detection circuit that the utility model embodiment provides；
Fig. 4 is a kind of circuit diagram for detection circuit that the utility model embodiment provides；
Fig. 5 is a kind of structural schematic diagram for power supply constant-current circuit that the utility model embodiment provides；
Fig. 6 is a kind of circuit diagram for power supply constant-current circuit that the utility model embodiment provides；
Fig. 7 is a kind of structural schematic diagram for power supply constant-current device that the utility model embodiment provides.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than all real
Apply example.Based on the embodiments of the present invention, those of ordinary skill in the art under the premise of not making the creative labor,
The every other embodiment obtained, belongs to scope of protection of the utility model.
The purpose of this utility model is to provide a kind of detection circuit, power supply constant-current circuit and power supply constant-current device, Neng Gouti
Rise the accuracy of the constant current testing result of belt switch power supply constant-current device.
In order to make those skilled in the art be better understood from technical solutions of the utility model, below in conjunction with the accompanying drawings and specifically
The utility model is described in further detail for embodiment.
Fig. 2 is the structural schematic diagram that the utility model implements a kind of detection circuit provided.As shown in Fig. 2, this practicality is new
The detection circuit that type provides is applied to the power supply constant-current device of belt switch 22, including operational amplifier circuit 20, further includes：
For the divider resistance 21 of partial pressure, the first end of divider resistance 21 is connect with the non-moving end of switch 22, divider resistance
21 second end is connect with the negative input of amplifier 201 in operational amplifier circuit 20.
Wherein, it should be noted that first end is used to refer to one end of divider resistance 21, and second end is for referring to divider resistance 21
The other end, only distinguish divider resistance 21 both ends and name, have no other particular meanings.In addition, in fig. 2, although being
The connection relation for illustrating detection circuit and power supply constant-current device, switch 22 shown together with divider resistance 21 and operational amplifier circuit 20
Go out, however, it is noteworthy that not including switch 22 in detection circuit, but only includes divider resistance 21 and operational amplifier circuit
20, switch 22 belongs to power supply constant-current device itself.
The positive input of amplifier 201 and the connection type of the power supply constant-current device of belt switch 22 are same as the prior art,
The utility model embodiment repeats no more.Due in the power supply constant-current device of belt switch 22, the non-moving end of switch 22 and amplifier
Only include resistance and circuit between 201 positive input without including switch 22 itself, so, by the of divider resistance 21
One end is connect with the non-moving end of switch 22, after the second end of divider resistance 21 is connect with the negative input of amplifier 201, amplifier
It does not include switch 22 to be between 201 positive input and negative input, in this way, just will not be again because of the pressure on switch 22
Drop is contained in the calculating process of operational amplifier circuit 20 and generates error, more accurate to be calculated using this detection circuit
True output current, and then promote the accuracy of the constant current testing result of power supply constant-current device.
Specifically, output current is equal between the reference voltage of operational amplifier circuit 20 divided by the non-moving end and the ends Vc of switch 22 only
Including resistance, that is to say, that the output current that detection circuit provided by the utility model calculates only with reference voltage
The resistance for only including between the non-moving end of switch 22 and the ends Vc is related, and the non-moving end and Vc of reference voltage and switch 22
(error of reference voltage is 0.3%-0.5% to very little to the error for the resistance for only including between end, and switch 22 is not again
The error for the resistance for only including between moved end and the output end for adjusting circuit is ± 1%), so, the utility model provides
The error of the output current calculated of detection circuit do not exceed ± 5%.As it can be seen that ± 15% in compared with the prior art
The error of (practical volume production assessment numerical value), the constant current detection accuracy of this detection circuit have obtained significantly being promoted.
It is understood that no matter whether the internal resistance of switch 22 used by the power supply constant-current device of batch belt switch 22 is protected
Hold it is consistent, when the power supply constant-current device to belt switch 22 carries out constant current detection, the pressure drop on switch 22 be it is how many, will not be because
Pressure drop on switch 22 causes different error, does not interfere with the accuracy of the output current calculated more, therefore, application
This detection circuit can further promote the accuracy of the constant current testing result of batch power supply constant-current device.
It can be seen that the negative input of amplifier passes through partial pressure in the operational amplifier circuit of detection circuit provided by the utility model
The non-moving end of resistance and switch connects, in this way, no longer including just switch, fortune between the positive input and negative input of amplifier
Pressure drop between the positive input and negative input put also no longer includes just the pressure drop of switch, the calculating process of operational amplifier circuit
In more will not include again switch pressure drop so that the internal resistance of switch can not influence the calculating process of operational amplifier circuit, operation
The output current gone out is more accurate, and then promotes the accuracy of testing result.Moreover, no matter the power supply constant current of batch belt switch fills
Whether the internal resistance switched used by setting is consistent, and also will not influence to calculate because of the pressure drop difference on each switch defeated
Go out the accuracy of electric current, therefore, the constant current that batch power supply constant-current device can be further promoted using this detection circuit detects knot
The accuracy of fruit.
Fig. 3 is the circuit diagram figure of divider resistance in a kind of detection circuit that the utility model embodiment provides.Such as Fig. 3 institutes
Show, on the basis of the utility model one embodiment, mode is preferably carried out as one kind, in the utility model second
In the detection circuit that embodiment provides, it includes the first divider resistance R10, the second divider resistance R11 and that divider resistance 21, which has,
Three divider resistance R13；The first end of first divider resistance R10 is connect with the first non-moving end of switch SW1, the second divider resistance
The first end of R11 is connect with the second non-moving end of switch SW1, and the first end of third divider resistance R13 is electric with the first partial pressure simultaneously
The second end of resistance 212 is connected with the second end of the second divider resistance R11, and second end and the negative sense of third divider resistance R13 input
End connection；Wherein, the non-moving end of switch SW1 includes the first non-moving end and the second non-moving end.
When switch SW1 and the first divider resistance R10 are connected, the voltage signal of the negative input input of operational amplifier circuit 20
It then can be by the 6th resistance R8, the first divider resistance R10, the second divider resistance R11 and third divider resistance R13 partial pressures
, when switch SW1 and the second divider resistance R11 is connected, the voltage signal of the negative input input of operational amplifier circuit 20 then may be used
To be obtained by the 7th resistance R3, the first divider resistance R10, the second divider resistance R11 and third divider resistance R13 partial pressures.
As it can be seen that in detection circuit provided in this embodiment, the voltage signal of the negative input of operational amplifier circuit 20 is accessed
For original 7th resistance R3 or the 6th resistance R8 and the first divider resistance R10 in the power supply constant-current device by belt switch SW1,
What the second divider resistance R11 and third divider resistance R13 was divided, do not include the pressure drop signal on switch SW1, therefore, warp
The output current that operational amplifier circuit 20 generates can be promoted than using the output current that the prior art calculates more accurate
The accuracy of the constant current testing result of power supply constant-current device.
Normal operation in order to ensure operational amplifier circuit 20 is interference-free, and mode, the first partial pressure are preferably carried out as one kind
The resistance value of resistance R10, the second divider resistance R11 and third divider resistance R13 are between 200 ohm to 20000 ohm.
Fig. 4 is a kind of circuit diagram for detection circuit that the utility model embodiment provides.As shown in Fig. 4, any of the above-described
On the basis of embodiment, it being preferably carried out mode as one kind, in the detection circuit that the utility model third embodiment provides
In, operational amplifier circuit 20 specifically include amplifier U1, first resistor R28, second resistance R29,3rd resistor R31, the 4th resistance R19,
5th resistance R18, the first capacitance C14, the second capacitance C9 and third capacitance C8；
The first end of the first end of first resistor R28, the first end of second resistance R29 and the first capacitance C14 passes through simultaneously
6th resistance R8 is connect with the first divider resistance R10, or is connect with the second divider resistance R11 by the 7th resistance R3, the first electricity
Hinder the second end, the second end of the second end of second resistance R29 and the first capacitance C14 while the positive input of amplifier U1 of R28
It is connected with the first end of 3rd resistor R31, the second termination reference voltage V ref of 3rd resistor R31；
The negative input of amplifier U1 is connect with the first end of the 4th resistance R19, and the second end of the 4th resistance R19 passes through
Second capacitance C9 is connect with the output end of amplifier U1；
The power input of amplifier U1 is connect with the first end of the first end of the 5th resistance R18 and third capacitance C8 simultaneously,
The second termination input power VCC of 5th resistance R10, the second end of third capacitance C8 and the ground terminal of amplifier U1 are grounded；
Wherein, detection circuit includes the 6th resistance R8 and the 7th resistance R3.
It being preferably carried out mode as one kind, amplifier U1 is specially LM358.LM358 is dual operational amplifier.Inside includes
There are two the operational amplifiers that independent, high-gain, internal frequency compensate, and are suitable for the very wide single supply of supply voltage range,
It is also applied for dual power supply operating mode, under the operating condition of recommendation, source current is unrelated with supply voltage.
In order to make the detection result of the detection circuit of above-described embodiment offer be maintained at a preferable state, as one kind
It is preferably carried out mode, the resistance value of the 6th resistance R8 and the 7th resistance R3 are between 0.05 ohm to 0.3 ohm.
The utility model additionally provides a kind of power supply constant-current circuit including above-mentioned detection circuit, due to power supply constant-current circuit
Partial embodiment and the embodiment of detection circuit part mutually correlate, therefore the embodiment of power supply constant-current circuit part can join
The description for seeing the embodiment of detection circuit part, for identical part, the utility model repeats no more.
Fig. 5 is a kind of structural schematic diagram for power supply constant-current circuit that the utility model embodiment provides.As shown in figure 5, real
The power supply constant-current circuit of example offer is provided, including：
For AC signal to be converted to the rectification circuit 50 of direct current signal, for adjusting output voltage and output current
The detection circuit 52 as described in above-mentioned any embodiment for adjusting circuit 51 and being exported for arithmetic eror and by error；
The output end of operational amplifier circuit 20 in detection circuit 52 is connect with circuit 51 is adjusted.
Since power supply constant-current circuit provided in this embodiment includes the detection circuit that any of the above-described embodiment is provided, so
Power supply constant-current circuit provided in this embodiment has the identical advantageous effect with above-mentioned any detection circuit, and the utility model is not
It repeats again.
In order to make those skilled in the art be better understood from technical solution provided by the utility model, with reference to power supply
The circuit diagram of constant-current circuit, to select the detection circuit that the utility model third embodiment provides as the detection circuit of itself
For 52 power supply constant current detection circuit, power supply constant-current circuit provided in this embodiment is described in detail.
Fig. 6 is a kind of circuit diagram for power supply constant-current circuit that the utility model embodiment provides.As shown in fig. 6, in this reality
In the power supply constant-current circuit for applying example offer, rectification circuit 50 includes diode D1, resistance R51, resistance R50, capacitance C29 and electrolysis
Capacitance C4；The anode of diode D1 as AC signal input terminal, while with the cathode of electrolytic capacitor C4, resistance R51 first
End is connected with the first end of resistance R50, and the second end of resistance R51 and the second end of resistance R50 connect with one end of capacitance C29 simultaneously
It connects, the other end of capacitance C29 is connect with the anode of the cathode of diode D1 and electrolytic capacitor C4 simultaneously.Adjusting circuit 51 includes
Zener diode ZD1, light emitting diode U2, diode D6, resistance R16, resistance R30, resistance R27, resistance R20 resistance R26,
Resistance R52, resistance R6, capacitance C28 and controllable accurate source of stable pressure U6；The cathode of zener diode ZD1 is simultaneously with diode D1's
Cathode, resistance R6 the anode of first end connection zener diode ZD1 connect simultaneously with resistance R16 and input power VCC, it is electric
The second end for hindering R16 is connect with the first end of the anode of light emitting diode U2 and resistance R30 simultaneously, and the second end of resistance R30 is same
When with the cathode of light emitting diode U2, the first end of resistance 27, the first end of capacitance C28 and controllable accurate source of stable pressure U6 the moon
Pole connects, and the second end of resistance R27 is connect with the anode of diode D6, and the cathode of diode D6 connects with the output end of amplifier U1
Connect, the second end of capacitance C28 by resistance R20 simultaneously with the second end of resistance R6, controllable accurate source of stable pressure U6 reference pole,
The first end of resistance R26, the first end of resistance R52 are connected with reference voltage Vref input, the second end of resistance R26, resistance
The second end of R52 and the anode of controllable accurate source of stable pressure U6 first end, the first end and electricity of resistance R29 with resistance R28 simultaneously
Hold the first end connection of C14.
The utility model additionally provides a kind of power supply constant-current device including above-mentioned power supply constant-current circuit, due to power supply constant current
The embodiment of device part and the embodiment of power supply constant-current circuit part mutually correlate, therefore the implementation of power supply constant-current device part
Example may refer to the description of the embodiment of power supply constant-current circuit part, and for identical part, the utility model repeats no more.
Fig. 7 is a kind of structural schematic diagram for power supply constant-current device that the utility model embodiment provides.As shown in fig. 7, this
The power supply constant-current device that embodiment provides includes power supply constant-current device ontology 70 and circuit board 71, is provided on circuit board 71 as above
State power supply constant-current circuit described in embodiment.
The power supply provided by being provided with above-described embodiment on the circuit board of power supply constant-current device provided in this embodiment
Constant-current circuit, so power supply constant-current device provided in this embodiment has with power supply constant-current circuit phase described in above-described embodiment
Same advantageous effect, the utility model repeat no more.
A kind of detection circuit provided by the utility model, power supply constant-current circuit and power supply constant-current device are carried out above
It is discussed in detail.Each embodiment is described by the way of progressive in specification, and each embodiment, which stresses, is and other realities
Apply the difference of example, just to refer each other for identical similar portion between each embodiment.
It should be pointed out that for those skilled in the art, before not departing from the utility model principle
It puts, several improvements and modifications can be made to this utility model, these improvement and modification also fall into the utility model right
It is required that protection domain in.
It should also be noted that, in the present specification, such as first and second etc relational terms are used merely to one
A entity is either operated either to operate with another entity and be distinguished without necessarily requiring or implying these entities or behaviour
There are any actual relationship or orders between work.Moreover, the terms "include", "comprise" or its any variant are intended to
Cover non-exclusive inclusion, so that the process, method, article or equipment including a series of element includes not only that
A little elements, but also include the other elements being not explicitly listed, further include either for this process, method, article or setting
Standby intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in the process, method, article or apparatus that includes the element.
Claims (8)
1. a kind of detection circuit is applied to the power supply constant-current device of belt switch, including operational amplifier circuit, which is characterized in that further include：
For the divider resistance of partial pressure, the first end of the divider resistance is connect with the non-moving end of the switch, the partial pressure electricity
The second end of resistance is connect with the negative input of amplifier in the operational amplifier circuit.
2. detection circuit according to claim 1, which is characterized in that it includes the first partial pressure electricity that the divider resistance, which has,
Resistance, the second divider resistance and third divider resistance；
The first end of first divider resistance is connect with the first non-moving end of the switch, and the first of second divider resistance
End is connect with the second non-moving end of the switch, the first end of the third divider resistance and meanwhile with first divider resistance
Second end is connected with the second end of second divider resistance, second end and the negative input of the third divider resistance
Connection；
Wherein, the non-moving end of the switch includes first non-moving end and second non-moving end.
3. detection circuit according to claim 2, which is characterized in that first divider resistance, the second partial pressure electricity
The resistance value of resistance and the third divider resistance is between 200 ohm to 20000 ohm.
4. detection circuit according to claim 2 or 3, which is characterized in that the operational amplifier circuit specifically includes amplifier, first
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first capacitance, the second capacitance and third capacitance；
The first end of the first end of the first resistor, the first end of the second resistance and the first capacitance passes through the 6th electricity simultaneously
Resistance is connect with first divider resistance, or is connect with second divider resistance by the 7th resistance, the first resistor
The second end of second end, the second end of the second resistance and the first capacitance simultaneously with the positive input of the amplifier and described
The first end of 3rd resistor connects, the second termination reference voltage of the 3rd resistor；
The negative input of the amplifier is connect with the first end of the 4th resistance, and the second end of the 4th resistance passes through institute
The second capacitance is stated to connect with the output end of the amplifier；
The power input of the amplifier is connect with the first end of the first end of the 5th resistance and the third capacitance simultaneously,
Second termination input power of the 5th resistance, the second end of the third capacitance and the ground terminal of the amplifier are grounded；
Wherein, the detection circuit includes the 6th resistance and the 7th resistance.
5. detection circuit according to claim 3, which is characterized in that the amplifier is specially LM358.
6. detection circuit according to claim 4, which is characterized in that the resistance value of the 6th resistance and the 7th resistance
Between 0.05 ohm to 0.3 ohm.
7. a kind of power supply constant-current circuit, which is characterized in that including：
Rectification circuit for AC signal to be converted to direct current signal, the adjusting electricity for adjusting output voltage and output current
Road and the detection circuit as claimed in any one of claims 1 to 6 exported for arithmetic eror and by the error；
The output end of operational amplifier circuit in the detection circuit is connect with the adjusting circuit.
8. a kind of power supply constant-current device, including power supply constant-current device ontology and circuit board, which is characterized in that set on the circuit board
It is equipped with power supply constant-current circuit as claimed in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721732421.9U CN207638549U (en) | 2017-12-11 | 2017-12-11 | A kind of detection circuit, power supply constant-current circuit and power supply constant-current device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721732421.9U CN207638549U (en) | 2017-12-11 | 2017-12-11 | A kind of detection circuit, power supply constant-current circuit and power supply constant-current device |
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| Publication Number | Publication Date |
|---|---|
| CN207638549U true CN207638549U (en) | 2018-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721732421.9U Active CN207638549U (en) | 2017-12-11 | 2017-12-11 | A kind of detection circuit, power supply constant-current circuit and power supply constant-current device |
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| Country | Link |
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| CN (1) | CN207638549U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834821A (en) * | 2017-12-11 | 2018-03-23 | 东莞市港奇电子有限公司 | One kind detection circuit, power supply constant-current circuit and power supply constant-current device |
-
2017
- 2017-12-11 CN CN201721732421.9U patent/CN207638549U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834821A (en) * | 2017-12-11 | 2018-03-23 | 东莞市港奇电子有限公司 | One kind detection circuit, power supply constant-current circuit and power supply constant-current device |
| CN107834821B (en) * | 2017-12-11 | 2024-02-23 | 东莞市港奇电子有限公司 | Detection circuit, power supply constant current circuit and power supply constant current device |
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