CN206481039U - Overvoltage crowbar and load voltage regulation circuit - Google Patents
Overvoltage crowbar and load voltage regulation circuit Download PDFInfo
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- CN206481039U CN206481039U CN201720135045.9U CN201720135045U CN206481039U CN 206481039 U CN206481039 U CN 206481039U CN 201720135045 U CN201720135045 U CN 201720135045U CN 206481039 U CN206481039 U CN 206481039U
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Abstract
The utility model discloses a kind of overvoltage crowbar and load voltage regulation circuit, including：Pressure sampling circuit, its two ends are connected to load two ends, and the sampled output output of the pressure sampling circuit characterizes the sampled voltage signal of load both end voltage value；Comparison circuit, its first input end receives described sampled voltage signal, and its second input receives reference signal, and described reference signal is the high terminal voltage or lower terminal voltage of load；Wherein, the sampled voltage signal and the reference signal are compared in comparison circuit, when occurring overvoltage, and low and high level conversion occurs for the output end of the comparison circuit.Comparison circuit, the then regulation available for load voltage, to keep loading constant pressure are used as using operational amplifier.The utility model is applied to various topological structures, with good compatibility, it is not necessary to complicated peripheral circuit.
Description
Technical field
The utility model is related to electric and electronic technical field, and in particular to a kind of overvoltage crowbar and load voltage regulation
Circuit.
Background technology
The LED drive circuit of prior art typically can apply among a variety of LED drivings topological structures, for example, Buck,
Boost, Buck-Boost, etc..Due to needing that overvoltage crowbar is set on the basis of LED drive circuit, accordingly, it would be desirable to
Set corresponding peripheral circuit matched.
The output voltage of the general LED drive circuit of being sampled by bleeder circuit of the overvoltage crowbar of prior art, and lead to
Cross the sampled signal to be compared with chip internal benchmark, to judge whether overvoltage.Then, because the benchmark of chip internal is solid
Fixed, in different topology structure is applicable, in the case where loading not ground altogether, actually its over-pressed judgment standard is different
, therefore prior art is difficult to be applied to various topological structures.Accordingly, it would be desirable to increase peripheral circuit and change relevant parameter in fact
Existing overvoltage protection, i.e., set different peripheral circuits for different topologys.
As shown in Fig. 1,2 or 3, the LED drive circuit using prior art overvoltage crowbar is respectively illustrated, Fig. 1 is
The application of Boost topological structures, Fig. 2 is the application of Buck topological structures, and Fig. 3 is the application of Buck-Boost topological structures.
In Fig. 2 and Fig. 3, because loading not altogether, so needing to set complicated peripheral circuit to adapt to the overvoltage protection electricity of prior art
Road.As a result of the overvoltage crowbar of prior art, the problem of not only existing poor compatibility, and complicated peripheral circuit
Power consumption and component cost can be increased.In addition, in the prior art, in the case where loading not ground altogether, due to chip internal benchmark
It is fixed, therefore it is unfavorable for loading the regulation of constant pressure.
Utility model content
In view of this, the utility model provides a kind of compatible good, the overvoltage crowbar of peripheral circuits and load
Voltage regulator circuit, the technical problem to solve prior art presence.
Technical solution of the present utility model is to provide a kind of overvoltage crowbar of following structure, including：
Pressure sampling circuit, its two ends are connected to load two ends, and the sampled output of the pressure sampling circuit is defeated
Go out to characterize the sampled voltage signal of load both end voltage value；
Comparison circuit, its first input end receives described sampled voltage signal, and its second input receives reference signal,
Described reference signal is the high terminal voltage or lower terminal voltage of load；
Wherein, the sampled voltage signal and the reference signal are compared in comparison circuit, when occurring overvoltage,
Low and high level conversion occurs for the output end of the comparison circuit.
Alternatively, described overvoltage crowbar also includes sampling resistor, described sampling resistor and the load in series,
The described load two ends that are connected to can be directly connected to the two ends of load or be connected to sampling resistor and load group
Into cascaded structure two ends, the high terminal voltage or lower terminal voltage of load can directly to load the current potential on high-end or low side,
Can also be the high terminal voltage or lower terminal voltage of the cascaded structure.
Alternatively, described sampling resistor is connected with the high-pressure side loaded, and one end of the pressure sampling circuit is connected to
The other end of sampling resistor, the other end of pressure sampling circuit is connected to the low-pressure end of load, the sampling resistor it is any one
The current potential at end is as the high terminal voltage of the load, and the high terminal voltage is used as reference signal.
Alternatively, described sampling resistor is connected with the low-pressure end loaded, and one end of the pressure sampling circuit is connected to
The other end of sampling resistor, the other end of pressure sampling circuit is connected to the high-pressure side of load, the sampling resistor and load
Public terminal potential is as the lower terminal voltage of the load, and the lower terminal voltage is used as reference signal.
Alternatively, reference voltage signal, described reference voltage are connected in one of input of the comparison circuit
Signal is connected between the reference signal and the input of comparison circuit.
Alternatively, described overvoltage crowbar is applied to the LED drives of Buck, Boost or Buck-Boost topological structure
In dynamic circuit.
Alternatively, described comparison circuit is integrated in chip.
Technical solution of the present utility model is to provide a kind of load voltage regulation circuit of following structure, including：
Pressure sampling circuit, its two ends are connected to load two ends, and the sampled output of the pressure sampling circuit is defeated
Go out to characterize the sampled voltage signal of load both end voltage value；
Operational amplifier, its first input end receives described sampled voltage signal, and its second input receives benchmark letter
Number, described reference signal is the high terminal voltage or lower terminal voltage of load；
Wherein, the sampled voltage signal and the reference signal carry out calculation process, output electricity in operational amplifier
Regulate signal is pressed, the size of load both end voltage is adjusted according to described regulated voltage signal so that load two ends electricity is characterized
The sampled voltage signal of pressure value levels off to the reference signal.
Using structure of the present utility model, compared with prior art, with advantages below：The utility model is by the height of load
Terminal voltage or lower terminal voltage are as reference signal, and the two ends of the pressure sampling circuit are connected to load two ends, will characterized
The sampled voltage signal of load both end voltage is compared with the reference signal, the comparative result and mistake of the two under normal work
Comparative result in the case of pressure is on the contrary, so as to judge overvoltage to carry out overvoltage protection.It can also solve to bear using the utility model
Carry in load voltage regulation not altogether in the case of ground.The utility model is applied to various topological structures, with good compatibility,
Complicated peripheral circuit is not needed.
Brief description of the drawings
Fig. 1 is the structural representation that prior art is applied to Boost topologys；
Fig. 2 is the structural representation that prior art is applied to Buck topologys；
Fig. 3 is the structural representation that prior art is applied to Buck-Boost topologys.
Fig. 4 is the structural representation that the utility model is applied to Boost topologys；
Fig. 5 is the structural representation that the utility model is applied to Buck topologys；
Fig. 6 is the structural representation that the utility model is applied to Buck-Boost topologys；
Fig. 7 is the structural representation of the overvoltage crowbar of the utility model；
Fig. 8 adjusts the structural representation of circuit for the load voltage of the utility model.
Embodiment
Preferred embodiment of the present utility model is described in detail below in conjunction with accompanying drawing, but the utility model is not merely
It is limited to these embodiments.The utility model covers any replacement made in spirit and scope of the present utility model, modification, equivalent
Method and scheme.
Thoroughly understand in order that the public has to the utility model, in following the utility model preferred embodiment specifically
Understand concrete details, and description without these details can also understand that this practicality is new completely for a person skilled in the art
Type.
The utility model is more specifically described by way of example referring to the drawings in the following passage.It should be noted that, accompanying drawing
Use using more simplified form and non-accurately ratio, only to it is convenient, lucidly aid in illustrating the utility model
The purpose of embodiment.
With reference to shown in Fig. 4, circuit structure of the utility model applied to Boost topologys is illustrated, to be driven applied to LED
Exemplified by circuit.Described LED drive circuit includes inductance L1, sustained diode 00 and the chip IC for being integrated with switching tube M, institute
The chip IC stated has over-voltage protecting function, and LED load is connected with sampling resistor R3, and sampling resistor R3 is used for current sample, its
The other end is connected with the negative terminal of sustained diode 00, the negativing ending grounding of LED load.Sampling resistor R3 two ends respectively at core
Piece IC pin ISP and ISN connection, to obtain the two ends at its two ends and obtain sample rate current, is received on pin ISP or ISN
The voltage arrived can be as reference signal.
Overvoltage protection voltage of the present utility model includes pressure sampling circuit and comparison circuit, described pressure sampling circuit
For the bleeder circuit being made up of resistance R1 and R2, bleeder circuit high-pressure side is connected with sampling resistor R3 high-pressure side, bleeder circuit
Low-pressure end and LED load negative terminal connect, that is, be grounded.The common port output of the resistance R1 and R2 characterizes load both end voltage
The sampled voltage signal of (because of sampling resistor R3 resistance very littles, therefore voltage thereon can be ignored)；
The first input end of the comparison circuit receives described sampled voltage signal, and its second input receives benchmark letter
Number, described reference signal is the high terminal voltage of load, is in the present embodiment the current potential of sampling resistor R3 high-pressure sides.Normal work
In the case of work, the sampled voltage signal is more than the reference signal, when occurring overvoltage, the output end of the comparison circuit
Generation low and high level is changed.
With reference to shown in Fig. 5, circuit structure of the utility model applied to Buck topologys, the company of overvoltage crowbar are illustrated
The principle for connecing relation is consistent with Fig. 4, similarly exemplified by applied to LED drive circuit, loads as LED.Switch in chip IC
Pipe M constitutes the LED drive circuit of Buck topologys with inductance L1, continued flow tube D00.LED load is connected with sampling resistor R3, sampling electricity
Hindering R3 is used for current sample, and its other end is connected with the negative terminal of sustained diode 00, the negative terminal and fly-wheel diode of LED load
Inductance L1 is connected between D00 anode.Sampling resistor R3 two ends are connected respectively at the pin ISP and ISN with chip IC, with
Obtain the two ends at its two ends and obtain sample rate current, received voltage can be used as reference signal on pin ISP or ISN.
Described pressure sampling circuit is also the bleeder circuit being made up of resistance R1 and R2, and bleeder circuit high-pressure side is with sampling resistor R3's
High-pressure side is connected, and the low-pressure end of bleeder circuit and the negative terminal of LED load are connected.The common port output of the resistance R1 and R2 is characterized
Load the sampled voltage signal of both end voltage (because of sampling resistor R3 resistance very littles, therefore voltage thereon can be ignored).It is right
In the realization of comparison circuit, then it will be explained and be illustrated in accompanying drawing below.
With reference to shown in Fig. 6, circuit structure of the utility model applied to Buck-Boost topologys, overvoltage protection electricity are illustrated
The principle of the annexation on road unanimously, similarly exemplified by applied to LED drive circuit, is loaded as LED with Fig. 4,5.The present invention
In the embodiment of Fig. 4,5 and 6, its core content is：The reference signal of LED overvoltage protections is that LED current sampling is high-end；LED overvoltages
Protection setting bleeder circuit is connected on the two ends of LED load.Due to sampling resistor R3 resistance very little, so voltage thereon can be with
Ignore, therefore the sampling of described LED current is high-end can also refer to the high-pressure side of LED load, the two of the LED load
End is also referred to as the two ends of the cascaded structure of LED load and sampling resistor composition.
With reference to shown in Fig. 7, the structure of the utility model overvoltage crowbar is illustrated, comparison circuit is further illustrated.
Comparator U01 is integrated in chip IC as comparison circuit, and ISP current samples are high-end, and ovp is sampled voltage signal, comparator
U01 anode is connected with ISP, that is, receives reference signal, and the negative terminal of comparator is connected with ovp, that is, is received and characterized load two ends electricity
The sampled voltage signal of pressure.In the case of normal work, the sampled voltage signal is less than the reference signal, comparator output
For high level, when occurring overvoltage, then saltus step is that the sampled voltage signal is more than the reference signal, now the comparator
High level occurs for U01 output end to low transition.According to actual conditions, can comparator U01 at least one input
Reference voltage signal Vref is set, and in the present embodiment, the reference voltage signal Vref is added in the anode of comparator, preferably just
Case is that described reference voltage signal is connected between the reference signal and the one of input of comparison circuit.
With reference to shown in Fig. 8, load voltage regulation circuit is illustrated.According to operational amplifier as comparison circuit, then Fig. 7
Circuit can adjust circuit as load voltage, that is, obtain the load voltage regulation circuit shown in Fig. 8.Load of the present utility model
Voltage regulator circuit includes pressure sampling circuit and operational amplifier U02, and pressure sampling circuit is made up of resistance R1 and R2
Bleeder circuit, its two ends are connected to load two ends, and the sampled output output of the pressure sampling circuit characterizes load two
The sampled voltage signal of terminal voltage value.The first input end of the operational amplifier receives described sampled voltage signal, and it the
Two inputs receive reference signal, and described reference signal is the high terminal voltage or lower terminal voltage of load.In load voltage regulation
In circuit, current sample is not needed typically, so can also be without sampling resistor R3.
The sampled voltage signal and the reference signal carry out calculation process, output voltage in operational amplifier U02
Regulate signal, the size of load both end voltage is adjusted according to described regulated voltage signal so that characterize load both end voltage
The sampled voltage signal of value levels off to the reference signal, i.e., load voltage keeps constant pressure.
In one of input connection reference voltage signal Vref of the operational amplifier U02, described reference electricity
Pressure signal is connected between the reference signal and the operational amplifier U02 input., can be negative in specific application
An adjustment of being connected in load is managed, and the output end of described operational amplifier is connected with the control end of described adjustment pipe.
In order to make it easy to understand, in Fig. 8 with Fig. 7 identicals part, employ same mark, at the same for the ease of reason
Solution, pin ovp, ISP have also continued to use Fig. 7 mark in Fig. 8.
In addition, although embodiment is separately illustrated and illustrated above, but it is related to the common technology in part, in this area
Those of ordinary skill apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and record is not known
Content, then refer to another embodiment on the books.
Embodiments described above, does not constitute the restriction to the technical scheme protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (9)
1. a kind of overvoltage crowbar, including：
Pressure sampling circuit, its two ends are connected to load two ends, the sampled output output table of the pressure sampling circuit
Levy the sampled voltage signal of load both end voltage value；
Comparison circuit, its first input end receives described sampled voltage signal, and its second input receives reference signal, described
Reference signal for load high terminal voltage or lower terminal voltage；
Wherein, the sampled voltage signal and the reference signal are compared in comparison circuit, described when occurring overvoltage
Low and high level conversion occurs for the output end of comparison circuit.
2. overvoltage crowbar according to claim 1, it is characterised in that：Described overvoltage crowbar also includes sampling
Resistance, described sampling resistor and the load in series, described being connected to, which loads two ends, can be directly connected to load
Two ends or the two ends for being connected to sampling resistor and the cascaded structure of load composition, high terminal voltage or the low side electricity of load
Pressure can directly load the high terminal voltage or lower terminal voltage of the current potential or the cascaded structure on high-end or low side.
3. overvoltage crowbar according to claim 2, it is characterised in that：Described sampling resistor and the high-pressure side of load
Connection, one end of the pressure sampling circuit is connected to the other end of sampling resistor, and the other end of pressure sampling circuit is connected to
The low-pressure end of load, the current potential of the either end of the sampling resistor is used as the high terminal voltage of the load, high terminal voltage work
On the basis of signal.
4. overvoltage crowbar according to claim 2, it is characterised in that：Described sampling resistor and the low-pressure end of load
Connection, one end of the pressure sampling circuit is connected to the other end of sampling resistor, and the other end of pressure sampling circuit is connected to
The high-pressure side of load, the sampling resistor and the public terminal potential of load are used as the lower terminal voltage of the load, the lower terminal voltage
It is used as reference signal.
5. the overvoltage crowbar according to claim 1-4 any one, it is characterised in that：In its of the comparison circuit
In input connection reference voltage signal, described reference voltage signal is connected to the reference signal and comparison circuit
Between the input.
6. the overvoltage crowbar according to claim 1 any one, it is characterised in that：Described overvoltage crowbar should
In LED drive circuit for Buck, Boost or Buck-Boost topological structure.
7. overvoltage crowbar according to claim 5, it is characterised in that：Described comparison circuit is integrated in chip.
8. a kind of load voltage adjusts circuit, including：
Pressure sampling circuit, its two ends are connected to load two ends, the sampled output output table of the pressure sampling circuit
Levy the sampled voltage signal of load both end voltage value；
Operational amplifier, its first input end receives described sampled voltage signal, and its second input receives reference signal, institute
The reference signal stated is the high terminal voltage or lower terminal voltage of load；
Wherein, the sampled voltage signal and the reference signal carry out calculation process in operational amplifier, and output voltage is adjusted
Signal is saved, the size of load both end voltage is adjusted according to described regulated voltage signal so that load both end voltage value is characterized
Sampled voltage signal level off to the reference signal.
9. load voltage according to claim 8 adjusts circuit, it is characterised in that：Wherein the one of the operational amplifier
Individual input connects reference voltage signal, and what described reference voltage signal was connected to the reference signal and operational amplifier should
Between input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720135045.9U CN206481039U (en) | 2017-02-15 | 2017-02-15 | Overvoltage crowbar and load voltage regulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720135045.9U CN206481039U (en) | 2017-02-15 | 2017-02-15 | Overvoltage crowbar and load voltage regulation circuit |
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| Publication Number | Publication Date |
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| CN206481039U true CN206481039U (en) | 2017-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720135045.9U Active CN206481039U (en) | 2017-02-15 | 2017-02-15 | Overvoltage crowbar and load voltage regulation circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711935A (en) * | 2017-02-15 | 2017-05-24 | 杰华特微电子（杭州）有限公司 | Overvoltage protection circuit and load voltage regulation circuit |
-
2017
- 2017-02-15 CN CN201720135045.9U patent/CN206481039U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711935A (en) * | 2017-02-15 | 2017-05-24 | 杰华特微电子（杭州）有限公司 | Overvoltage protection circuit and load voltage regulation circuit |
| CN106711935B (en) * | 2017-02-15 | 2020-07-31 | 杰华特微电子（杭州）有限公司 | Overvoltage protection circuit and load voltage regulating circuit |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |