CN203038148U - Constant voltage and constant current automatic switching circuit of direct current voltage-stabilized power supply - Google Patents
Constant voltage and constant current automatic switching circuit of direct current voltage-stabilized power supply Download PDFInfo
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- CN203038148U CN203038148U CN 201320020513 CN201320020513U CN203038148U CN 203038148 U CN203038148 U CN 203038148U CN 201320020513 CN201320020513 CN 201320020513 CN 201320020513 U CN201320020513 U CN 201320020513U CN 203038148 U CN203038148 U CN 203038148U
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Abstract
The utility model discloses a constant voltage and constant current automatic switching circuit of a direct current voltage-stabilized power supply. The constant voltage and constant current automatic switching circuit comprises a power supply output channel, an output terminal, a voltage sampling circuit, a current sampling circuit, a voltage comparator, a current comparator, a JK trigger, a constant current and constant voltage transfer switch, a constant voltage circuit and a constant current circuit. The power supply output channel is connected with the current sampling circuit and the output terminal; the current sampling circuit is connected with the current comparator; the current comparator is connected with a reference current; the output terminal is connected with the voltage sampling circuit; the voltage sampling circuit is connected with the voltage comparator; the voltage comparator is connected with a reference voltage; the current comparator is connected with the JK trigger; the voltage comparator is connected with the JK trigger; the constant current and constant voltage transfer switch is connected with the JK trigger; the constant voltage circuit is connected with the constant current and constant voltage transfer switch; the constant current circuit is connected with the constant current and constant voltage transfer switch; the constant voltage circuit is connected with the power supply output channel; and the constant current circuit is connected with the power supply output channel. The constant voltage and constant current automatic switching circuit is fast and accurate in switching.
Description
Technical field
The utility model relates to a kind of D.C. regulated power supply, relates in particular to a kind of constant pressure and flow automatic switch-over circuit of D.C. regulated power supply.
Background technology
D.C. regulated power supply generally has constant voltage and two kinds of duties of constant current.When its load current surpasses the setting current value just, in order to protect load, should make the rapid and reliable constant current state that switches to of D.C. regulated power supply; And when D.C. regulated power supply was operated in constant current state, when the voltage of load surpassed setting value just, D.C. regulated power supply should enter the constant voltage duty immediately.Therefore, D.C. regulated power supply need switch between constant voltage and two kinds of duties of constant current fast and accurately, but the response of the switching mode of prior art is very slow, and deviation occurs through regular meeting.
Summary of the invention
In order to overcome the deficiencies in the prior art, the purpose of this utility model provides a kind of constant pressure and flow automatic switch-over circuit accurate and D.C. regulated power supply that switch speed is fast that switches.
For achieving the above object, the technical solution of the utility model is: a kind of constant pressure and flow automatic switch-over circuit of D.C. regulated power supply comprises the D.C. regulated power supply output channel, the D.C. regulated power supply lead-out terminal, voltage sampling circuit, current sampling circuit, voltage comparator, current comparator, JK flip-flop, the constant current constant voltage change-over switch, constant voltage circuit, constant-current circuit, the output terminal of described D.C. regulated power supply output channel is electrically connected with the input end of current sampling circuit and D.C. regulated power supply lead-out terminal, the output terminal of current sampling circuit is electrically connected with the in-phase input end of current comparator, the inverting input of current comparator is electrically connected with a reference current, the D.C. regulated power supply lead-out terminal also is electrically connected with the input end of voltage sampling circuit, the output terminal of voltage sampling circuit is electrically connected with the in-phase input end of voltage comparator, the inverting input of voltage comparator is electrically connected with a reference voltage, the output terminal of current comparator is electrically connected with the J of JK flip-flop end, the output terminal of voltage comparator is electrically connected with the K of JK flip-flop end, the input end of constant current constant voltage change-over switch is electrically connected with the Q of JK flip-flop end, the input end of constant voltage circuit is electrically connected with an output terminal of constant current constant voltage change-over switch, the input end of constant-current circuit is electrically connected with another output terminal of constant current constant voltage change-over switch, the output terminal of constant voltage circuit is electrically connected with an input end of D.C. regulated power supply output channel, and the output terminal of constant-current circuit is electrically connected with another input end of D.C. regulated power supply output channel.
The utility model adopts above structure, and under the normality, D.C. regulated power supply is worked under pressure constant state, and what JK flip-flop was exported is low level signal, and constant current constant voltage change-over switch and constant voltage circuit are connected, and constant current constant voltage change-over switch and constant-current circuit disconnect; When under pressure constant state, the load of D.C. regulated power supply changes, when current sampling circuit samples electric current greater than reference current, current comparator output high level makes JK flip-flop change output state, namely exports high level signal, the constant current constant voltage change-over switch realizes switching, constant voltage circuit is disconnected, constant-current circuit connection work, D.C. regulated power supply is worked under constant current state; When D.C. regulated power supply is operated in constant current state following time, the electric current that current sampling circuit samples is inevitable less than reference current, current comparator output low level signal, when the load of D.C. regulated power supply changes again, the voltage that voltage sampling circuit samples is during greater than reference voltage, voltage comparator output high level, make JK flip-flop change output state, it is output low level, the constant current constant voltage change-over switch realizes switching, constant-current circuit is disconnected, constant voltage circuit connection work, D.C. regulated power supply is worked under pressure constant state.Realize the quick switching of the constant pressure and flow duty of quick D.C. regulated power supply thus, the utility model adopts hardware to realize switching, and switch speed not only soon and but also accurate.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
Fig. 1 is the structural principle synoptic diagram of the constant pressure and flow automatic switch-over circuit of the utility model D.C. regulated power supply.
Embodiment
As shown in Figure 1, the constant pressure and flow automatic switch-over circuit of a kind of D.C. regulated power supply of the utility model comprises D.C. regulated power supply output channel 1, D.C. regulated power supply lead-out terminal 2, voltage sampling circuit 3, current sampling circuit 4, voltage comparator 5, current comparator 6, JK flip-flop 7, constant current constant voltage change-over switch 8, constant voltage circuit 9, constant-current circuit 10, the output terminal of described D.C. regulated power supply output channel 1 is electrically connected with input end and the D.C. regulated power supply lead-out terminal 2 of current sampling circuit 4, the output terminal of current sampling circuit 4 is electrically connected with the in-phase input end of current comparator 6, the inverting input of current comparator 6 is electrically connected with a reference current 61, D.C. regulated power supply lead-out terminal 2 also is electrically connected with the input end of voltage sampling circuit 3, the output terminal of voltage sampling circuit 3 is electrically connected with the in-phase input end of voltage comparator 5, the inverting input of voltage comparator 5 is electrically connected with a reference voltage 51, the output terminal of current comparator 6 is electrically connected with the J end of JK flip-flop 7, the output terminal of voltage comparator 5 is electrically connected with the K end of JK flip-flop 7, the input end of constant current constant voltage change-over switch 8 is electrically connected with the Q end of JK flip-flop 7, the input end of constant voltage circuit 9 is electrically connected with an output terminal of constant current constant voltage change-over switch 8, the input end of constant-current circuit 10 is electrically connected with another output terminal of constant current constant voltage change-over switch 8, the output terminal of constant voltage circuit 9 is electrically connected with an input end of D.C. regulated power supply output channel 1, and the output terminal of constant-current circuit 10 is electrically connected with another input end of D.C. regulated power supply output channel 1.
Principle of work of the present utility model is as follows:
Under the normality, D.C. regulated power supply is worked under pressure constant state, and what JK flip-flop 7 was exported is low level signal, and constant current constant voltage change-over switch 8 is connected with constant voltage circuit 9, and constant current constant voltage change-over switch 8 disconnects with constant-current circuit 10;
When under pressure constant state, the load of D.C. regulated power supply changes, when current sampling circuit 4 samples electric current greater than reference current 61, current comparator 6 output high level make JK flip-flop 7 change output state, namely export high level signal, constant current constant voltage change-over switch 8 realizes switching, constant voltage circuit 9 is disconnected, constant-current circuit 10 connection work, D.C. regulated power supply is worked under constant current state;
When D.C. regulated power supply is operated in constant current state following time, the electric current that current sampling circuit 4 samples is inevitable less than reference current 61, current comparator 6 output low level signals, when the load of D.C. regulated power supply changes again, the voltage that voltage sampling circuit 3 samples is during greater than reference voltage 51, voltage comparator 5 output high level, make JK flip-flop 7 change output state, it is output low level, constant current constant voltage change-over switch 8 realizes switching, constant-current circuit 10 is disconnected, constant voltage circuit 9 connection work, D.C. regulated power supply is worked under pressure constant state.Realize the quick switching of the constant pressure and flow duty of quick D.C. regulated power supply thus, the utility model adopts hardware to realize switching, and switch speed not only soon and but also accurate.
Claims (1)
1. the constant pressure and flow automatic switch-over circuit of a D.C. regulated power supply, it is characterized in that: it comprises the D.C. regulated power supply output channel, the D.C. regulated power supply lead-out terminal, voltage sampling circuit, current sampling circuit, voltage comparator, current comparator, JK flip-flop, the constant current constant voltage change-over switch, constant voltage circuit, constant-current circuit, the output terminal of described D.C. regulated power supply output channel is electrically connected with the input end of current sampling circuit and D.C. regulated power supply lead-out terminal, the output terminal of current sampling circuit is electrically connected with the in-phase input end of current comparator, the inverting input of current comparator is electrically connected with a reference current, the D.C. regulated power supply lead-out terminal also is electrically connected with the input end of voltage sampling circuit, the output terminal of voltage sampling circuit is electrically connected with the in-phase input end of voltage comparator, the inverting input of voltage comparator is electrically connected with a reference voltage, the output terminal of current comparator is electrically connected with the J of JK flip-flop end, the output terminal of voltage comparator is electrically connected with the K of JK flip-flop end, the input end of constant current constant voltage change-over switch is electrically connected with the Q of JK flip-flop end, the input end of constant voltage circuit is electrically connected with an output terminal of constant current constant voltage change-over switch, the input end of constant-current circuit is electrically connected with another output terminal of constant current constant voltage change-over switch, the output terminal of constant voltage circuit is electrically connected with an input end of D.C. regulated power supply output channel, and the output terminal of constant-current circuit is electrically connected with another input end of D.C. regulated power supply output channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320020513 CN203038148U (en) | 2013-01-15 | 2013-01-15 | Constant voltage and constant current automatic switching circuit of direct current voltage-stabilized power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320020513 CN203038148U (en) | 2013-01-15 | 2013-01-15 | Constant voltage and constant current automatic switching circuit of direct current voltage-stabilized power supply |
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| CN203038148U true CN203038148U (en) | 2013-07-03 |
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| CN 201320020513 Expired - Fee Related CN203038148U (en) | 2013-01-15 | 2013-01-15 | Constant voltage and constant current automatic switching circuit of direct current voltage-stabilized power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777670A (en) * | 2014-01-23 | 2014-05-07 | 苏州市职业大学 | Direct-current power supply with constant voltage or constant current output |
| CN103809636A (en) * | 2014-03-12 | 2014-05-21 | 四川英杰电气股份有限公司 | Constant-voltage constant-current state switching method and control circuit for programmable power supply |
| CN104993698A (en) * | 2015-06-24 | 2015-10-21 | 西安三馀半导体有限公司 | DC-DC converter having constant current output protection function |
| CN117691861A (en) * | 2023-12-12 | 2024-03-12 | 山东艾诺智能仪器有限公司 | Constant voltage and constant current mode switching control method and system for direct current power supply |
-
2013
- 2013-01-15 CN CN 201320020513 patent/CN203038148U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777670A (en) * | 2014-01-23 | 2014-05-07 | 苏州市职业大学 | Direct-current power supply with constant voltage or constant current output |
| CN103777670B (en) * | 2014-01-23 | 2015-09-09 | 苏州市职业大学 | Can the direct supply of constant voltage or constant current output |
| CN103809636A (en) * | 2014-03-12 | 2014-05-21 | 四川英杰电气股份有限公司 | Constant-voltage constant-current state switching method and control circuit for programmable power supply |
| CN104993698A (en) * | 2015-06-24 | 2015-10-21 | 西安三馀半导体有限公司 | DC-DC converter having constant current output protection function |
| CN104993698B (en) * | 2015-06-24 | 2017-06-06 | 西安三馀半导体有限公司 | DC DC converters with constant current output defencive function |
| CN117691861A (en) * | 2023-12-12 | 2024-03-12 | 山东艾诺智能仪器有限公司 | Constant voltage and constant current mode switching control method and system for direct current power supply |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20160115 |
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| EXPY | Termination of patent right or utility model |