CN204288038U - Control circuit - Google Patents
Control circuit Download PDFInfo
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- CN204288038U CN204288038U CN201420716941.0U CN201420716941U CN204288038U CN 204288038 U CN204288038 U CN 204288038U CN 201420716941 U CN201420716941 U CN 201420716941U CN 204288038 U CN204288038 U CN 204288038U
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- resistance
- pin
- triode
- control circuit
- feedback amplifier
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Abstract
The utility model discloses a kind of control circuit, this control circuit comprises: model is the power-supply controller of electric of UC1843, 5th resistance, 6th resistance, feedback amplifier and the second triode, wherein, 8th pin of described power-supply controller of electric is connected to the in-phase end of described feedback amplifier, and described 8th pin is connected to sampled voltage by described 5th resistance and the 6th resistance successively, described sampled voltage is negative pressure, the end of oppisite phase of described feedback amplifier is connected between described 5th resistance and the 6th resistance, to obtain malleation, the base stage of described second triode is connected to the output terminal of described feedback amplifier, the collector of described second triode is connected to the first pin of described power supply chip, the grounded emitter of described second triode.
Description
Technical field
The utility model relates to circuit field, particularly, relates to a kind of control circuit.
Background technology
Constant-current source circuit is the stable sampled voltage that precision resistance string need be used in earth loop to obtain reflecting curent change realizing output current, because this voltage is generally less negative pressure, required voltage need be obtained by the circuit of some such as anti-phase amplifications.This type of control circuit amplifier used need be powered with positive-negative power, and the relevant treatment of sampled voltage also needs to use amplifier.These process are comparatively aobvious loaded down with trivial details above, and cause structure to become complicated, cost uprises.
Utility model content
The purpose of this utility model is to provide a kind of control circuit, and this control circuit avoids the loaded down with trivial details process to constant-current source circuit sampled voltage, improves the reliability of power supply, reduces cost.
To achieve these goals, the utility model provides a kind of control circuit, this control circuit comprises: model is the power-supply controller of electric of UC1843, the 5th resistance, the 6th resistance, feedback amplifier and the second triode, wherein, 8th pin of described power-supply controller of electric is connected to the in-phase end of described feedback amplifier, and described 8th pin is connected to sampled voltage by described 5th resistance and the 6th resistance successively, described sampled voltage is negative pressure, the end of oppisite phase of described feedback amplifier is connected between described 5th resistance and the 6th resistance, to obtain malleation;
The base stage of described second triode is connected to the output terminal of described feedback amplifier, and the collector of described second triode is connected to the first pin of described power supply chip, the grounded emitter of described second triode.
Preferably, this control circuit also comprises: the 3rd resistance and the 4th resistance, and described 8th pin is successively by described 3rd resistance and the 4th resistance eutral grounding, and the in-phase end of described feedback amplifier is connected between described 3rd resistance and the 4th resistance.
Preferably, this control circuit also comprises: the 9th resistance, and described 9th resistance is arranged between the output terminal of described feedback amplifier and the base stage of described second triode.
Preferably, this control circuit also comprises: the first triode, the collector of described first triode is connected to described 8th pin by the first resistance, the emitter of described first triode is by the tenth resistance eutral grounding, and the base stage of described first triode is connected to the 4th pin of described power-supply controller of electric.
Preferably, described tenth resistance is adjustable resistance, and the adjustable end of described adjustable resistance is connected to the 3rd pin of described power-supply controller of electric, and two ends are connected to emitter and the ground connection of described first triode in addition.
Preferably, the 4th pin of described power-supply controller of electric is by the second capacity earth.
Preferably, the second pin of described power supply chip is by the 8th resistance eutral grounding.
Preferably, the backward end of described feedback amplifier is connected to the output terminal of the 7th resistance, the first electric capacity and described feedback amplifier successively.
By above-mentioned embodiment, the utility model does not use amplifier to realize sampled voltage in constant-current source circuit and turns negative number to positive number, thus avoid using dual power supply to power to feedback amplifier, the utility model selects current mode PWM controller UC1843, sampled voltage obtains positive voltage by the pull-up of 8 pin utilizing UC1843, compare by feeding back amplifier with reference voltage, the voltage relatively obtained makes the voltage of 1 pin of UC1843 change, then the output pulse generation of 6 pin of UC1843 is made to change, this circuit avoids the loaded down with trivial details process to constant-current source circuit sampled voltage, improve the reliability of power supply, reduce cost.
Other feature and advantage of the present utility model are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for instructions, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 is the circuit diagram of the embodiment that a kind of control circuit of the present utility model is described.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the utility model, is not limited to the utility model.
The utility model provides a kind of control circuit, as shown in Figure 1, this control circuit comprises: model is power-supply controller of electric U1, the 5th resistance R5, the 6th resistance R6, the feedback amplifier U2 and the second triode Q2 of UC1843, wherein, 8th pin of described power-supply controller of electric U1 is connected to the in-phase end of described feedback amplifier, and described 8th pin is connected to sampled voltage by described 5th resistance R5 and the 6th resistance R6 successively, described sampled voltage is negative pressure, the end of oppisite phase of described feedback amplifier is connected between described 5th resistance R5 and the 6th resistance R6, to obtain malleation; The base stage of described second triode Q2 is connected to the output terminal of described feedback amplifier, and the collector of described second triode Q2 is connected to the first pin of described power supply chip, the grounded emitter of described second triode Q2.
By above-mentioned embodiment, the utility model does not use amplifier to realize sampled voltage in constant-current source circuit and turns negative number to positive number, thus avoids using dual power supply to power to feedback amplifier, improves degree of regulation, the utility model selects current mode PWM controller UC1843, sampled voltage obtains positive voltage by utilizing the pull-up of the 8th pin of UC1843 (pin as representated by the numeral 8 in accompanying drawing), avoid and use dual power supply amplifier to process sampled voltage, positive voltage and reference voltage compare by feeding back amplifier, the voltage relatively obtained makes the voltage of 1 pin of UC1843 change, then the output pulse generation of the 6th pin (pin as representated by the numeral 6 in accompanying drawing) of UC1843 is made to change, this circuit avoids the loaded down with trivial details process to constant-current source circuit sampled voltage, improve the reliability of power supply, reduce cost.
Be further detailed below in conjunction with accompanying drawing 1 pair of the utility model, in the utility model, by the circuit described in Fig. 1, can realize not using amplifier to realize sampled voltage in constant-current source circuit and turn negative number to positive number, thus avoid using dual power supply to power to feedback amplifier.
In this kind of embodiment, this control circuit also comprises: the 3rd resistance R3 and the 4th resistance R4,3rd resistance R3 and the 4th resistance R4 ground connection as described in described 8th pin (pin as representated by the numeral 8 in accompanying drawing) passes through successively, the in-phase end of described feedback amplifier U2 is connected between described 3rd resistance R3 and the 4th resistance R4, by such mode, provide feedback amplifier (U2 described in the figure) reference voltage needed for in-phase end.
In this kind of embodiment, this control circuit also comprises: the 9th resistance R9, and described 9th resistance R9 is arranged between the output terminal of described feedback amplifier U2 and the base stage of described second triode, to realize the function of step-down.
In this kind of embodiment, this control circuit also comprises: the first triode, the collector of described first triode is connected to described 8th pin by the first resistance R1, the emitter of described first triode is by the tenth resistance R10 ground connection, and the base stage of described first triode is connected to the 4th pin of described power-supply controller of electric (pin as representated by the numeral 4 in accompanying drawing).
In this kind of embodiment, described tenth resistance R10 is adjustable resistance, the adjustable end of described adjustable resistance is connected to the 3rd pin (pin as representated by the numeral 3 in accompanying drawing) of described power-supply controller of electric, two ends are connected to emitter and the ground connection of described first triode (representated by the Q1 in accompanying drawing device) in addition, are achieved adjustment and the control of the voltage of the 3rd pin by such connected mode.
In this kind of embodiment, the 4th pin (pin as representated by the numeral 4 in accompanying drawing) of described power-supply controller of electric is by the second electric capacity C2 ground connection.
In this kind of embodiment, second pin (pin as representated by the numeral 2 in accompanying drawing) of described power supply chip is by the 8th resistance R8 ground connection.
In this kind of embodiment, the backward end of described feedback amplifier is connected to the output terminal of the 7th resistance R7, the first electric capacity C1 and described feedback amplifier U2 successively.
In the utility model, when sampled voltage-V reduces, namely output load reduces, when output current increases, the current potential of U2 end of oppisite phase raises, and after comparing prosperity with the reference voltage of U2 in-phase end, the current potential of U2 output terminal reduces, cause the first pin (pin as representated by the numeral 1 in the accompanying drawing) voltage of U1 to increase, i.e. the pulsewidth of the output pulse of the 6th pin (pin as representated by the numeral 6 in accompanying drawing) of U1 increases.
When sampled voltage-V increases, namely output load increases, when output current reduces, the current potential of U2 end of oppisite phase reduces, after comparing prosperity with the reference voltage of U2 in-phase end, the current potential of U2 output terminal raises, and causes the first pin (pin as representated by the numeral 1 in the accompanying drawing) voltage of U1 to reduce, i.e. the pulsewidth of the output pulse of the 6th pin (pin as representated by the numeral 6 in accompanying drawing) of U1 reduces.
This circuit avoids the loaded down with trivial details process to constant-current source circuit sampled voltage, improves the reliability of power supply, reduces cost.
Below preferred implementation of the present utility model is described by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the utility model illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (8)
1. a control circuit, it is characterized in that, this control circuit comprises: model is the power-supply controller of electric of UC1843, 5th resistance, 6th resistance, feedback amplifier and the second triode, wherein, 8th pin of described power-supply controller of electric is connected to the in-phase end of described feedback amplifier, and described 8th pin is connected to sampled voltage by described 5th resistance and the 6th resistance successively, described sampled voltage is negative pressure, the end of oppisite phase of described feedback amplifier is connected between described 5th resistance and the 6th resistance, to obtain malleation, the base stage of described second triode is connected to the output terminal of described feedback amplifier, the collector of described second triode is connected to the first pin of described power supply chip, the grounded emitter of described second triode.
2. control circuit according to claim 1, it is characterized in that, this control circuit also comprises: the 3rd resistance and the 4th resistance, and described 8th pin is successively by described 3rd resistance and the 4th resistance eutral grounding, and the in-phase end of described feedback amplifier is connected between described 3rd resistance and the 4th resistance.
3. control circuit according to claim 1, is characterized in that, this control circuit also comprises: the 9th resistance, and described 9th resistance is arranged between the output terminal of described feedback amplifier and the base stage of described second triode.
4. control circuit according to claim 1, it is characterized in that, this control circuit also comprises: the first triode, the collector of described first triode is connected to described 8th pin by the first resistance, the emitter of described first triode is by the tenth resistance eutral grounding, and the base stage of described first triode is connected to the 4th pin of described power-supply controller of electric.
5. control circuit according to claim 4, it is characterized in that, described tenth resistance is adjustable resistance, and the adjustable end of described adjustable resistance is connected to the 3rd pin of described power-supply controller of electric, and two ends are connected to emitter and the ground connection of described first triode in addition.
6. control circuit according to claim 1, is characterized in that, the 4th pin of described power-supply controller of electric is by the second capacity earth.
7. control circuit according to claim 1, is characterized in that, the second pin of described power supply chip is by the 8th resistance eutral grounding.
8. control circuit according to claim 1, is characterized in that, the backward end of described feedback amplifier is connected to the output terminal of the 7th resistance, the first electric capacity and described feedback amplifier successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420716941.0U CN204288038U (en) | 2014-11-25 | 2014-11-25 | Control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420716941.0U CN204288038U (en) | 2014-11-25 | 2014-11-25 | Control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204288038U true CN204288038U (en) | 2015-04-22 |
Family
ID=52871177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420716941.0U Expired - Fee Related CN204288038U (en) | 2014-11-25 | 2014-11-25 | Control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204288038U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478557A (en) * | 2020-05-08 | 2020-07-31 | 中国人民解放军战略支援部队信息工程大学 | Negative high-voltage feedback power circuit |
-
2014
- 2014-11-25 CN CN201420716941.0U patent/CN204288038U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478557A (en) * | 2020-05-08 | 2020-07-31 | 中国人民解放军战略支援部队信息工程大学 | Negative high-voltage feedback power circuit |
| CN111478557B (en) * | 2020-05-08 | 2021-02-23 | 中国人民解放军战略支援部队信息工程大学 | Negative high-voltage feedback power circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20211125 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |